lisp/gnus/gnus-sum.el

   1 ;;; gnus-sum.el --- summary mode commands for Gnus
   2
   3 ;; Copyright (C) 1996-2015 Free Software Foundation, Inc.
   4
   5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   6 ;; Keywords: news
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;;; Code:
  26
  27 (eval-when-compile
  28   (require 'cl))
  29 (eval-when-compile
  30   (when (featurep 'xemacs)
  31     (require 'easy-mmode))) ; for `define-minor-mode'
  32
  33 (defvar tool-bar-mode)
  34 (defvar gnus-tmp-header)
  35
  36 (require 'gnus)
  37 (require 'gnus-group)
  38 (require 'gnus-spec)
  39 (require 'gnus-range)
  40 (require 'gnus-int)
  41 (require 'gnus-undo)
  42 (require 'gnus-util)
  43 (require 'gmm-utils)
  44 (require 'mm-decode)
  45 (require 'nnoo)
  46
  47 (autoload 'gnus-summary-limit-include-cached "gnus-cache" nil t)
  48 (autoload 'gnus-cache-write-active "gnus-cache")
  49 (autoload 'gnus-mailing-list-insinuate "gnus-ml" nil t)
  50 (autoload 'turn-on-gnus-mailing-list-mode "gnus-ml" nil t)
  51 (autoload 'gnus-pick-line-number "gnus-salt" nil t)
  52 (autoload 'mm-uu-dissect "mm-uu")
  53 (autoload 'gnus-article-outlook-deuglify-article "deuglify"
  54   "Deuglify broken Outlook (Express) articles and redisplay."
  55   t)
  56 (autoload 'gnus-article-outlook-unwrap-lines "deuglify" nil t)
  57 (autoload 'gnus-article-outlook-repair-attribution "deuglify" nil t)
  58 (autoload 'gnus-article-outlook-rearrange-citation "deuglify" nil t)
  59 (autoload 'nnir-article-rsv "nnir" nil nil 'macro)
  60 (autoload 'nnir-article-group "nnir" nil nil 'macro)
  61
  62 (defcustom gnus-kill-summary-on-exit t
  63   "*If non-nil, kill the summary buffer when you exit from it.
  64 If nil, the summary will become a \"*Dead Summary*\" buffer, and
  65 it will be killed sometime later."
  66   :group 'gnus-summary-exit
  67   :type 'boolean)
  68
  69 (defcustom gnus-summary-next-group-on-exit t
  70   "If non-nil, go to the next unread newsgroup on summary exit.
  71 See `gnus-group-goto-unread'."
  72   :link '(custom-manual "(gnus)Group Maneuvering")
  73   :group 'gnus-summary-exit
  74   :version "23.1" ;; No Gnus
  75   :type 'boolean)
  76
  77 (defcustom gnus-summary-stop-at-end-of-message nil
  78   "If non-nil, don't select the next message when using `SPC'."
  79   :link '(custom-manual "(gnus)Group Maneuvering")
  80   :group 'gnus-summary-maneuvering
  81   :version "24.1"
  82   :type 'boolean)
  83
  84 (defcustom gnus-fetch-old-headers nil
  85   "*Non-nil means that Gnus will try to build threads by grabbing old headers.
  86 If an unread article in the group refers to an older, already
  87 read (or just marked as read) article, the old article will not
  88 normally be displayed in the Summary buffer.  If this variable is
  89 t, Gnus will attempt to grab the headers to the old articles, and
  90 thereby build complete threads.  If it has the value `some', all
  91 old headers will be fetched but only enough headers to connect
  92 otherwise loose threads will be displayed.  This variable can
  93 also be a number.  In that case, no more than that number of old
  94 headers will be fetched.  If it has the value `invisible', all
  95 old headers will be fetched, but none will be displayed.
  96
  97 The server has to support NOV for any of this to work.
  98
  99 This feature can seriously impact performance it ignores all
 100 locally cached header entries.  Setting it to t for groups for a
 101 server that doesn't expire articles (such as news.gmane.org),
 102 leads to very slow summary generation."
 103   :group 'gnus-thread
 104   :type '(choice (const :tag "off" nil)
 105                  (const :tag "on" t)
 106                  (const some)
 107                  (const invisible)
 108                  number
 109                  (sexp :menu-tag "other" t)))
 110
 111 (defcustom gnus-refer-thread-limit 500
 112   "*The number of old headers to fetch when doing \\<gnus-summary-mode-map>\\[gnus-summary-refer-thread].
 113 If t, fetch all the available old headers."
 114   :group 'gnus-thread
 115   :type '(choice number
 116                  (sexp :menu-tag "other" t)))
 117
 118 (defcustom gnus-refer-thread-use-nnir nil
 119   "*Use nnir to search an entire server when referring threads. A
 120 nil value will only search for thread-related articles in the
 121 current group."
 122   :version "24.1"
 123   :group 'gnus-thread
 124   :type 'boolean)
 125
 126 (defcustom gnus-summary-make-false-root 'adopt
 127   "*nil means that Gnus won't gather loose threads.
 128 If the root of a thread has expired or been read in a previous
 129 session, the information necessary to build a complete thread has been
 130 lost.  Instead of having many small sub-threads from this original thread
 131 scattered all over the summary buffer, Gnus can gather them.
 132
 133 If non-nil, Gnus will try to gather all loose sub-threads from an
 134 original thread into one large thread.
 135
 136 If this variable is non-nil, it should be one of `none', `adopt',
 137 `dummy' or `empty'.
 138
 139 If this variable is `none', Gnus will not make a false root, but just
 140 present the sub-threads after another.
 141 If this variable is `dummy', Gnus will create a dummy root that will
 142 have all the sub-threads as children.
 143 If this variable is `adopt', Gnus will make one of the \"children\"
 144 the parent and mark all the step-children as such.
 145 If this variable is `empty', the \"children\" are printed with empty
 146 subject fields.  (Or rather, they will be printed with a string
 147 given by the `gnus-summary-same-subject' variable.)"
 148   :group 'gnus-thread
 149   :type '(choice (const :tag "off" nil)
 150                  (const none)
 151                  (const dummy)
 152                  (const adopt)
 153                  (const empty)))
 154
 155 (defcustom gnus-summary-make-false-root-always nil
 156   "Always make a false dummy root."
 157   :version "22.1"
 158   :group 'gnus-thread
 159   :type 'boolean)
 160
 161 (defcustom gnus-summary-gather-exclude-subject "^ *$\\|^(none)$"
 162   "*A regexp to match subjects to be excluded from loose thread gathering.
 163 As loose thread gathering is done on subjects only, that means that
 164 there can be many false gatherings performed.  By rooting out certain
 165 common subjects, gathering might become saner."
 166   :group 'gnus-thread
 167   :type 'regexp)
 168
 169 (defcustom gnus-summary-gather-subject-limit nil
 170   "*Maximum length of subject comparisons when gathering loose threads.
 171 Use nil to compare full subjects.  Setting this variable to a low
 172 number will help gather threads that have been corrupted by
 173 newsreaders chopping off subject lines, but it might also mean that
 174 unrelated articles that have subject that happen to begin with the
 175 same few characters will be incorrectly gathered.
 176
 177 If this variable is `fuzzy', Gnus will use a fuzzy algorithm when
 178 comparing subjects."
 179   :group 'gnus-thread
 180   :type '(choice (const :tag "off" nil)
 181                  (const fuzzy)
 182                  (sexp :menu-tag "on" t)))
 183
 184 (defcustom gnus-simplify-subject-functions nil
 185   "List of functions taking a string argument that simplify subjects.
 186 The functions are applied recursively.
 187
 188 Useful functions to put in this list include:
 189 `gnus-simplify-subject-re', `gnus-simplify-subject-fuzzy',
 190 `gnus-simplify-whitespace', and `gnus-simplify-all-whitespace'."
 191   :group 'gnus-thread
 192   :type '(repeat function))
 193
 194 (defcustom gnus-simplify-ignored-prefixes nil
 195   "*Remove matches for this regexp from subject lines when simplifying fuzzily."
 196   :group 'gnus-thread
 197   :type '(choice (const :tag "off" nil)
 198                  regexp))
 199
 200 (defcustom gnus-build-sparse-threads nil
 201   "*If non-nil, fill in the gaps in threads.
 202 If `some', only fill in the gaps that are needed to tie loose threads
 203 together.  If `more', fill in all leaf nodes that Gnus can find.  If
 204 non-nil and non-`some', fill in all gaps that Gnus manages to guess."
 205   :group 'gnus-thread
 206   :type '(choice (const :tag "off" nil)
 207                  (const some)
 208                  (const more)
 209                  (sexp :menu-tag "all" t)))
 210
 211 (defcustom gnus-summary-thread-gathering-function
 212   'gnus-gather-threads-by-subject
 213   "*Function used for gathering loose threads.
 214 There are two pre-defined functions: `gnus-gather-threads-by-subject',
 215 which only takes Subjects into consideration; and
 216 `gnus-gather-threads-by-references', which compared the References
 217 headers of the articles to find matches."
 218   :group 'gnus-thread
 219   :type '(radio (function-item gnus-gather-threads-by-subject)
 220                 (function-item gnus-gather-threads-by-references)
 221                 (function :tag "other")))
 222
 223 (defcustom gnus-summary-same-subject ""
 224   "*String indicating that the current article has the same subject as the previous.
 225 This variable will only be used if the value of
 226 `gnus-summary-make-false-root' is `empty'."
 227   :group 'gnus-summary-format
 228   :type 'string)
 229
 230 (defcustom gnus-summary-goto-unread nil
 231   "*If t, many commands will go to the next unread article.
 232 This applies to marking commands as well as other commands that
 233 \"naturally\" select the next article, like, for instance, `SPC' at
 234 the end of an article.
 235
 236 If nil, the marking commands do NOT go to the next unread article
 237 \(they go to the next article instead).  If `never', commands that
 238 usually go to the next unread article, will go to the next article,
 239 whether it is read or not."
 240   :version "24.1"
 241   :group 'gnus-summary-marks
 242   :link '(custom-manual "(gnus)Setting Marks")
 243   :type '(choice (const :tag "off" nil)
 244                  (const never)
 245                  (sexp :menu-tag "on" t)))
 246
 247 (defcustom gnus-summary-default-score 0
 248   "*Default article score level.
 249 All scores generated by the score files will be added to this score.
 250 If this variable is nil, scoring will be disabled."
 251   :group 'gnus-score-default
 252   :type '(choice (const :tag "disable")
 253                  integer))
 254
 255 (defcustom gnus-summary-default-high-score 0
 256   "*Default threshold for a high scored article.
 257 An article will be highlighted as high scored if its score is greater
 258 than this score."
 259   :version "22.1"
 260   :group 'gnus-score-default
 261   :type 'integer)
 262
 263 (defcustom gnus-summary-default-low-score 0
 264   "*Default threshold for a low scored article.
 265 An article will be highlighted as low scored if its score is smaller
 266 than this score."
 267   :version "22.1"
 268   :group 'gnus-score-default
 269   :type 'integer)
 270
 271 (defcustom gnus-summary-zcore-fuzz 0
 272   "*Fuzziness factor for the zcore in the summary buffer.
 273 Articles with scores closer than this to `gnus-summary-default-score'
 274 will not be marked."
 275   :group 'gnus-summary-format
 276   :type 'integer)
 277
 278 (defcustom gnus-simplify-subject-fuzzy-regexp nil
 279   "*Strings to be removed when doing fuzzy matches.
 280 This can either be a regular expression or list of regular expressions
 281 that will be removed from subject strings if fuzzy subject
 282 simplification is selected."
 283   :group 'gnus-thread
 284   :type '(repeat regexp))
 285
 286 (defcustom gnus-show-threads t
 287   "*If non-nil, display threads in summary mode."
 288   :group 'gnus-thread
 289   :type 'boolean)
 290
 291 (defcustom gnus-thread-hide-subtree nil
 292   "*If non-nil, hide all threads initially.
 293 This can be a predicate specifier which says which threads to hide.
 294 If threads are hidden, you have to run the command
 295 `gnus-summary-show-thread' by hand or select an article."
 296   :group 'gnus-thread
 297   :type '(radio (sexp :format "Non-nil\n"
 298                       :match (lambda (widget value)
 299                                (not (or (consp value) (functionp value))))
 300                       :value t)
 301                 (const nil)
 302                 (sexp :tag "Predicate specifier")))
 303
 304 (defcustom gnus-thread-hide-killed t
 305   "*If non-nil, hide killed threads automatically."
 306   :group 'gnus-thread
 307   :type 'boolean)
 308
 309 (defcustom gnus-thread-ignore-subject t
 310   "*If non-nil, which is the default, ignore subjects and do all threading based on the Reference header.
 311 If nil, articles that have different subjects from their parents will
 312 start separate threads."
 313   :group 'gnus-thread
 314   :type 'boolean)
 315
 316 (defcustom gnus-thread-operation-ignore-subject t
 317   "*If non-nil, subjects will be ignored when doing thread commands.
 318 This affects commands like `gnus-summary-kill-thread' and
 319 `gnus-summary-lower-thread'.
 320
 321 If this variable is nil, articles in the same thread with different
 322 subjects will not be included in the operation in question.  If this
 323 variable is `fuzzy', only articles that have subjects that are fuzzily
 324 equal will be included."
 325   :group 'gnus-thread
 326   :type '(choice (const :tag "off" nil)
 327                  (const fuzzy)
 328                  (sexp :tag "on" t)))
 329
 330 (defcustom gnus-thread-indent-level 4
 331   "*Number that says how much each sub-thread should be indented."
 332   :group 'gnus-thread
 333   :type 'integer)
 334
 335 (defcustom gnus-auto-extend-newsgroup t
 336   "*If non-nil, extend newsgroup forward and backward when requested."
 337   :group 'gnus-summary-choose
 338   :type 'boolean)
 339
 340 (defcustom gnus-auto-select-first t
 341   "If non-nil, select an article on group entry.
 342 An article is selected automatically when entering a group
 343 e.g. with \\<gnus-group-mode-map>\\[gnus-group-read-group], or via `gnus-summary-next-page' or
 344 `gnus-summary-catchup-and-goto-next-group'.
 345
 346 Which article is selected is controlled by the variable
 347 `gnus-auto-select-subject'.
 348
 349 If you want to prevent automatic selection of articles in some
 350 newsgroups, set the variable to nil in `gnus-select-group-hook'."
 351   ;; Commands include...
 352   ;; \\<gnus-group-mode-map>\\[gnus-group-read-group]
 353   ;; \\<gnus-summary-mode-map>\\[gnus-summary-next-page]
 354   ;; \\<gnus-summary-mode-map>\\[gnus-summary-catchup-and-goto-next-group]
 355   :group 'gnus-group-select
 356   :type '(choice (const :tag "none" nil)
 357                  (sexp :menu-tag "first" t)))
 358
 359 (defcustom gnus-auto-select-subject 'unseen-or-unread
 360   "*Says what subject to place under point when entering a group.
 361
 362 This variable can either be the symbols `first' (place point on the
 363 first subject), `unread' (place point on the subject line of the first
 364 unread article), `best' (place point on the subject line of the
 365 highest-scored article), `unseen' (place point on the subject line of
 366 the first unseen article), `unseen-or-unread' (place point on the subject
 367 line of the first unseen article or, if all articles have been seen, on the
 368 subject line of the first unread article), or a function to be called to
 369 place point on some subject line."
 370   :version "24.1"
 371   :group 'gnus-group-select
 372   :type '(choice (const best)
 373                  (const unread)
 374                  (const first)
 375                  (const unseen)
 376                  (const unseen-or-unread)
 377                  (function :tag "Function to call")))
 378
 379 (defcustom gnus-auto-select-next t
 380   "*If non-nil, offer to go to the next group from the end of the previous.
 381 If the value is t and the next newsgroup is empty, Gnus will exit
 382 summary mode and go back to group mode.  If the value is neither nil
 383 nor t, Gnus will select the following unread newsgroup.  In
 384 particular, if the value is the symbol `quietly', the next unread
 385 newsgroup will be selected without any confirmation, and if it is
 386 `almost-quietly', the next group will be selected without any
 387 confirmation if you are located on the last article in the group.
 388 Finally, if this variable is `slightly-quietly', the `\\<gnus-summary-mode-map>\\[gnus-summary-catchup-and-goto-next-group]' command
 389 will go to the next group without confirmation."
 390   :group 'gnus-summary-maneuvering
 391   :type '(choice (const :tag "off" nil)
 392                  (const quietly)
 393                  (const almost-quietly)
 394                  (const slightly-quietly)
 395                  (sexp :menu-tag "on" t)))
 396
 397 (defcustom gnus-auto-select-same nil
 398   "*If non-nil, select the next article with the same subject.
 399 If there are no more articles with the same subject, go to
 400 the first unread article."
 401   :group 'gnus-summary-maneuvering
 402   :type 'boolean)
 403
 404 (defcustom gnus-auto-select-on-ephemeral-exit 'next-noselect
 405   "What article should be selected after exiting an ephemeral group.
 406 Valid values include:
 407
 408 `next'
 409   Select the next article.
 410 `next-unread'
 411   Select the next unread article.
 412 `next-noselect'
 413   Move the cursor to the next article.  This is the default.
 414 `next-unread-noselect'
 415   Move the cursor to the next unread article.
 416
 417 If it has any other value or there is no next (unread) article, the
 418 article selected before entering to the ephemeral group will appear."
 419   :version "23.1" ;; No Gnus
 420   :group 'gnus-summary-maneuvering
 421   :type '(choice :format "%{%t%}:\n %[Value Menu%] %v"
 422                  (const next) (const next-unread)
 423                  (const next-noselect) (const next-unread-noselect)
 424                  (sexp :tag "other" :value nil)))
 425
 426 (defcustom gnus-auto-goto-ignores 'unfetched
 427   "*Says how to handle unfetched articles when maneuvering.
 428
 429 This variable can either be the symbols nil (maneuver to any
 430 article), `undownloaded' (maneuvering while unplugged ignores articles
 431 that have not been fetched), `always-undownloaded' (maneuvering always
 432 ignores articles that have not been fetched), `unfetched' (maneuvering
 433 ignores articles whose headers have not been fetched).
 434
 435 NOTE: The list of unfetched articles will always be nil when plugged
 436 and, when unplugged, a subset of the undownloaded article list."
 437   :version "22.1"
 438   :group 'gnus-summary-maneuvering
 439   :type '(choice (const :tag "None" nil)
 440                  (const :tag "Undownloaded when unplugged" undownloaded)
 441                  (const :tag "Undownloaded" always-undownloaded)
 442                  (const :tag "Unfetched" unfetched)))
 443
 444 (defcustom gnus-summary-check-current nil
 445   "*If non-nil, consider the current article when moving.
 446 The \"unread\" movement commands will stay on the same line if the
 447 current article is unread."
 448   :group 'gnus-summary-maneuvering
 449   :type 'boolean)
 450
 451 (defcustom gnus-auto-center-summary
 452   (max (or (bound-and-true-p scroll-margin) 0) 2)
 453   "*If non-nil, always center the current summary buffer.
 454 In particular, if `vertical' do only vertical recentering.  If non-nil
 455 and non-`vertical', do both horizontal and vertical recentering."
 456   :group 'gnus-summary-maneuvering
 457   :type '(choice (const :tag "none" nil)
 458                  (const vertical)
 459                  (integer :tag "height")
 460                  (sexp :menu-tag "both" t)))
 461
 462 (defcustom gnus-auto-center-group t
 463   "If non-nil, always center the group buffer."
 464   :group 'gnus-summary-maneuvering
 465   :type 'boolean)
 466
 467 (defcustom gnus-show-all-headers nil
 468   "*If non-nil, don't hide any headers."
 469   :group 'gnus-article-hiding
 470   :group 'gnus-article-headers
 471   :type 'boolean)
 472
 473 (defcustom gnus-summary-ignore-duplicates nil
 474   "*If non-nil, ignore articles with identical Message-ID headers."
 475   :group 'gnus-summary
 476   :type 'boolean)
 477
 478 (defcustom gnus-single-article-buffer nil
 479   "*If non-nil, display all articles in the same buffer.
 480 If nil, each group will get its own article buffer."
 481   :version "24.1"
 482   :group 'gnus-article-various
 483   :type 'boolean)
 484
 485 (defcustom gnus-widen-article-window nil
 486   "If non-nil, selecting the article buffer will display only the article buffer."
 487   :version "24.1"
 488   :group 'gnus-article-various
 489   :type 'boolean)
 490
 491 (defcustom gnus-break-pages t
 492   "*If non-nil, do page breaking on articles.
 493 The page delimiter is specified by the `gnus-page-delimiter'
 494 variable."
 495   :group 'gnus-article-various
 496   :type 'boolean)
 497
 498 (defcustom gnus-move-split-methods nil
 499   "*Variable used to suggest where articles are to be moved to.
 500 It uses the same syntax as the `gnus-split-methods' variable.
 501 However, whereas `gnus-split-methods' specifies file names as targets,
 502 this variable specifies group names."
 503   :group 'gnus-summary-mail
 504   :type '(repeat (choice (list :value (fun) function)
 505                          (cons :value ("" "") regexp (repeat string))
 506                          (sexp :value nil))))
 507
 508 (defcustom gnus-move-group-prefix-function 'gnus-group-real-prefix
 509   "Function used to compute default prefix for article move/copy/etc prompts.
 510 The function should take one argument, a group name, and return a
 511 string with the suggested prefix."
 512   :group 'gnus-summary-mail
 513   :type 'function)
 514
 515 ;; FIXME: Although the custom type is `character' for the following variables,
 516 ;; using multibyte characters (Latin-1, UTF-8) doesn't work.  -- rs
 517
 518 (defcustom gnus-unread-mark ?           ;Whitespace
 519   "*Mark used for unread articles."
 520   :group 'gnus-summary-marks
 521   :type 'character)
 522
 523 (defcustom gnus-ticked-mark ?!
 524   "*Mark used for ticked articles."
 525   :group 'gnus-summary-marks
 526   :type 'character)
 527
 528 (defcustom gnus-dormant-mark ??
 529   "*Mark used for dormant articles."
 530   :group 'gnus-summary-marks
 531   :type 'character)
 532
 533 (defcustom gnus-del-mark ?r
 534   "*Mark used for del'd articles."
 535   :group 'gnus-summary-marks
 536   :type 'character)
 537
 538 (defcustom gnus-read-mark ?R
 539   "*Mark used for read articles."
 540   :group 'gnus-summary-marks
 541   :type 'character)
 542
 543 (defcustom gnus-expirable-mark ?E
 544   "*Mark used for expirable articles."
 545   :group 'gnus-summary-marks
 546   :type 'character)
 547
 548 (defcustom gnus-killed-mark ?K
 549   "*Mark used for killed articles."
 550   :group 'gnus-summary-marks
 551   :type 'character)
 552
 553 (defcustom gnus-spam-mark ?$
 554   "*Mark used for spam articles."
 555   :version "22.1"
 556   :group 'gnus-summary-marks
 557   :type 'character)
 558
 559 (defcustom gnus-kill-file-mark ?X
 560   "*Mark used for articles killed by kill files."
 561   :group 'gnus-summary-marks
 562   :type 'character)
 563
 564 (defcustom gnus-low-score-mark ?Y
 565   "*Mark used for articles with a low score."
 566   :group 'gnus-summary-marks
 567   :type 'character)
 568
 569 (defcustom gnus-catchup-mark ?C
 570   "*Mark used for articles that are caught up."
 571   :group 'gnus-summary-marks
 572   :type 'character)
 573
 574 (defcustom gnus-replied-mark ?A
 575   "*Mark used for articles that have been replied to."
 576   :group 'gnus-summary-marks
 577   :type 'character)
 578
 579 (defcustom gnus-forwarded-mark ?F
 580   "*Mark used for articles that have been forwarded."
 581   :version "22.1"
 582   :group 'gnus-summary-marks
 583   :type 'character)
 584
 585 (defcustom gnus-recent-mark ?N
 586   "*Mark used for articles that are recent."
 587   :version "22.1"
 588   :group 'gnus-summary-marks
 589   :type 'character)
 590
 591 (defcustom gnus-cached-mark ?*
 592   "*Mark used for articles that are in the cache."
 593   :group 'gnus-summary-marks
 594   :type 'character)
 595
 596 (defcustom gnus-saved-mark ?S
 597   "*Mark used for articles that have been saved."
 598   :group 'gnus-summary-marks
 599   :type 'character)
 600
 601 (defcustom gnus-unseen-mark ?.
 602   "*Mark used for articles that haven't been seen."
 603   :version "22.1"
 604   :group 'gnus-summary-marks
 605   :type 'character)
 606
 607 (defcustom gnus-no-mark ?               ;Whitespace
 608   "*Mark used for articles that have no other secondary mark."
 609   :version "22.1"
 610   :group 'gnus-summary-marks
 611   :type 'character)
 612
 613 (defcustom gnus-ancient-mark ?O
 614   "*Mark used for ancient articles."
 615   :group 'gnus-summary-marks
 616   :type 'character)
 617
 618 (defcustom gnus-sparse-mark ?Q
 619   "*Mark used for sparsely reffed articles."
 620   :group 'gnus-summary-marks
 621   :type 'character)
 622
 623 (defcustom gnus-canceled-mark ?G
 624   "*Mark used for canceled articles."
 625   :group 'gnus-summary-marks
 626   :type 'character)
 627
 628 (defcustom gnus-duplicate-mark ?M
 629   "*Mark used for duplicate articles."
 630   :group 'gnus-summary-marks
 631   :type 'character)
 632
 633 (defcustom gnus-undownloaded-mark ?-
 634   "*Mark used for articles that weren't downloaded."
 635   :version "22.1"
 636   :group 'gnus-summary-marks
 637   :type 'character)
 638
 639 (defcustom gnus-downloaded-mark ?+
 640   "*Mark used for articles that were downloaded."
 641   :group 'gnus-summary-marks
 642   :type 'character)
 643
 644 (defcustom gnus-downloadable-mark ?%
 645   "*Mark used for articles that are to be downloaded."
 646   :group 'gnus-summary-marks
 647   :type 'character)
 648
 649 (defcustom gnus-unsendable-mark ?=
 650   "*Mark used for articles that won't be sent."
 651   :group 'gnus-summary-marks
 652   :type 'character)
 653
 654 (defcustom gnus-score-over-mark ?+
 655   "*Score mark used for articles with high scores."
 656   :group 'gnus-summary-marks
 657   :type 'character)
 658
 659 (defcustom gnus-score-below-mark ?-
 660   "*Score mark used for articles with low scores."
 661   :group 'gnus-summary-marks
 662   :type 'character)
 663
 664 (defcustom gnus-empty-thread-mark ?     ;Whitespace
 665   "*There is no thread under the article."
 666   :group 'gnus-summary-marks
 667   :type 'character)
 668
 669 (defcustom gnus-not-empty-thread-mark ?=
 670   "*There is a thread under the article."
 671   :group 'gnus-summary-marks
 672   :type 'character)
 673
 674 (defcustom gnus-view-pseudo-asynchronously nil
 675   "*If non-nil, Gnus will view pseudo-articles asynchronously."
 676   :group 'gnus-extract-view
 677   :type 'boolean)
 678
 679 (defcustom gnus-auto-expirable-marks
 680   (list gnus-killed-mark gnus-del-mark gnus-catchup-mark
 681         gnus-low-score-mark gnus-ancient-mark gnus-read-mark
 682         gnus-duplicate-mark)
 683   "*The list of marks converted into expiration if a group is auto-expirable."
 684   :version "24.1"
 685   :group 'gnus-summary
 686   :type '(repeat character))
 687
 688 (defcustom gnus-inhibit-user-auto-expire t
 689   "*If non-nil, user marking commands will not mark an article as expirable, even if the group has auto-expire turned on."
 690   :version "21.1"
 691   :group 'gnus-summary
 692   :type 'boolean)
 693
 694 (defcustom gnus-mark-copied-or-moved-articles-as-expirable nil
 695   "If non-nil, mark articles copied or moved to auto-expire group as expirable.
 696 If nil, the expirable marks will be unchanged except that the marks
 697 will be removed when copying or moving articles to a group that has
 698 not turned auto-expire on.  If non-nil, articles that have been read
 699 will be marked as expirable when being copied or moved to a group in
 700 which auto-expire is turned on."
 701   :version "23.2"
 702   :type 'boolean
 703   :group 'gnus-summary-marks)
 704
 705 (defcustom gnus-view-pseudos nil
 706   "*If `automatic', pseudo-articles will be viewed automatically.
 707 If `not-confirm', pseudos will be viewed automatically, and the user
 708 will not be asked to confirm the command."
 709   :group 'gnus-extract-view
 710   :type '(choice (const :tag "off" nil)
 711                  (const automatic)
 712                  (const not-confirm)))
 713
 714 (defcustom gnus-view-pseudos-separately t
 715   "*If non-nil, one pseudo-article will be created for each file to be viewed.
 716 If nil, all files that use the same viewing command will be given as a
 717 list of parameters to that command."
 718   :group 'gnus-extract-view
 719   :type 'boolean)
 720
 721 (defcustom gnus-insert-pseudo-articles t
 722   "*If non-nil, insert pseudo-articles when decoding articles."
 723   :group 'gnus-extract-view
 724   :type 'boolean)
 725
 726 (defcustom gnus-summary-dummy-line-format
 727   "   %(:                             :%) %S\n"
 728   "*The format specification for the dummy roots in the summary buffer.
 729 It works along the same lines as a normal formatting string,
 730 with some simple extensions.
 731
 732 %S  The subject
 733
 734 General format specifiers can also be used.
 735 See `(gnus)Formatting Variables'."
 736   :link '(custom-manual "(gnus)Formatting Variables")
 737   :group 'gnus-threading
 738   :type 'string)
 739
 740 (defcustom gnus-summary-mode-line-format "Gnus: %g [%A] %Z"
 741   "*The format specification for the summary mode line.
 742 It works along the same lines as a normal formatting string,
 743 with some simple extensions:
 744
 745 %G  Group name
 746 %p  Unprefixed group name
 747 %A  Current article number
 748 %z  Current article score
 749 %V  Gnus version
 750 %U  Number of unread articles in the group
 751 %e  Number of unselected articles in the group
 752 %Z  A string with unread/unselected article counts
 753 %g  Shortish group name
 754 %S  Subject of the current article
 755 %u  User-defined spec
 756 %s  Current score file name
 757 %d  Number of dormant articles
 758 %r  Number of articles that have been marked as read in this session
 759 %E  Number of articles expunged by the score files"
 760   :group 'gnus-summary-format
 761   :type 'string)
 762
 763 (defcustom gnus-list-identifiers nil
 764   "Regexp that matches list identifiers to be removed from subject.
 765 This can also be a list of regexps."
 766   :version "21.1"
 767   :group 'gnus-summary-format
 768   :group 'gnus-article-hiding
 769   :type '(choice (const :tag "none" nil)
 770                  (regexp :value ".*")
 771                  (repeat :value (".*") regexp)))
 772
 773 (defcustom gnus-summary-mark-below 0
 774   "*Mark all articles with a score below this variable as read.
 775 This variable is local to each summary buffer and usually set by the
 776 score file."
 777   :group 'gnus-score-default
 778   :type 'integer)
 779
 780 (defun gnus-widget-reversible-match (widget value)
 781   "Ignoring WIDGET, convert VALUE to internal form.
 782 VALUE should have the form `FOO' or `(not FOO)', where FOO is an symbol."
 783   ;; (debug value)
 784   (or (symbolp value)
 785       (and (listp value)
 786            (eq (length value) 2)
 787            (eq (nth 0 value) 'not)
 788            (symbolp (nth 1 value)))))
 789
 790 (defun gnus-widget-reversible-to-internal (widget value)
 791   "Ignoring WIDGET, convert VALUE to internal form.
 792 VALUE should have the form `FOO' or `(not FOO)', where FOO is an atom.
 793 FOO is converted to (FOO nil) and (not FOO) is converted to (FOO t)."
 794   ;; (debug value)
 795   (if (atom value)
 796       (list value nil)
 797     (list (nth 1 value) t)))
 798
 799 (defun gnus-widget-reversible-to-external (widget value)
 800   "Ignoring WIDGET, convert VALUE to external form.
 801 VALUE should have the form `(FOO nil)' or `(FOO t)', where FOO is an atom.
 802 \(FOO  nil) is converted to FOO and (FOO t) is converted to (not FOO)."
 803   ;; (debug value)
 804   (if (nth 1 value)
 805       (list 'not (nth 0 value))
 806     (nth 0 value)))
 807
 808 (define-widget 'gnus-widget-reversible 'group
 809   "A `group' that convert values."
 810   :match 'gnus-widget-reversible-match
 811   :value-to-internal 'gnus-widget-reversible-to-internal
 812   :value-to-external 'gnus-widget-reversible-to-external)
 813
 814 (defcustom gnus-article-sort-functions '(gnus-article-sort-by-number)
 815   "*List of functions used for sorting articles in the summary buffer.
 816
 817 Each function takes two articles and returns non-nil if the first
 818 article should be sorted before the other.  If you use more than one
 819 function, the primary sort function should be the last.  You should
 820 probably always include `gnus-article-sort-by-number' in the list of
 821 sorting functions -- preferably first.  Also note that sorting by date
 822 is often much slower than sorting by number, and the sorting order is
 823 very similar.  (Sorting by date means sorting by the time the message
 824 was sent, sorting by number means sorting by arrival time.)
 825
 826 Each item can also be a list `(not F)' where F is a function;
 827 this reverses the sort order.
 828
 829 Ready-made functions include `gnus-article-sort-by-number',
 830 `gnus-article-sort-by-author', `gnus-article-sort-by-subject',
 831 `gnus-article-sort-by-date', `gnus-article-sort-by-random'
 832 and `gnus-article-sort-by-score'.
 833
 834 When threading is turned on, the variable `gnus-thread-sort-functions'
 835 controls how articles are sorted."
 836   :group 'gnus-summary-sort
 837   :type '(repeat (gnus-widget-reversible
 838                   (choice (function-item gnus-article-sort-by-number)
 839                           (function-item gnus-article-sort-by-author)
 840                           (function-item gnus-article-sort-by-subject)
 841                           (function-item gnus-article-sort-by-date)
 842                           (function-item gnus-article-sort-by-score)
 843                           (function-item gnus-article-sort-by-random)
 844                           (function :tag "other"))
 845                   (boolean :tag "Reverse order"))))
 846
 847 (defcustom gnus-thread-sort-functions '(gnus-thread-sort-by-number)
 848   "*List of functions used for sorting threads in the summary buffer.
 849 By default, threads are sorted by article number.
 850
 851 Each function takes two threads and returns non-nil if the first
 852 thread should be sorted before the other.  If you use more than one
 853 function, the primary sort function should be the last.  You should
 854 probably always include `gnus-thread-sort-by-number' in the list of
 855 sorting functions -- preferably first.  Also note that sorting by date
 856 is often much slower than sorting by number, and the sorting order is
 857 very similar.  (Sorting by date means sorting by the time the message
 858 was sent, sorting by number means sorting by arrival time.)
 859
 860 Each list item can also be a list `(not F)' where F is a
 861 function; this specifies reversed sort order.
 862
 863 Ready-made functions include `gnus-thread-sort-by-number',
 864 `gnus-thread-sort-by-author', `gnus-thread-sort-by-recipient'
 865 `gnus-thread-sort-by-subject', `gnus-thread-sort-by-date',
 866 `gnus-thread-sort-by-score', `gnus-thread-sort-by-most-recent-number',
 867 `gnus-thread-sort-by-most-recent-date', `gnus-thread-sort-by-random',
 868 and `gnus-thread-sort-by-total-score' (see
 869 `gnus-thread-score-function').
 870
 871 When threading is turned off, the variable
 872 `gnus-article-sort-functions' controls how articles are sorted.
 873
 874 By default, threads and their subthreads are sorted according to
 875 the value of this variable.  To use a different sorting order for
 876 subthreads, customize `gnus-subthread-sort-functions'."
 877   :group 'gnus-summary-sort
 878   :type '(repeat
 879           (gnus-widget-reversible
 880            (choice (function-item gnus-thread-sort-by-number)
 881                    (function-item gnus-thread-sort-by-author)
 882                    (function-item gnus-thread-sort-by-recipient)
 883                    (function-item gnus-thread-sort-by-subject)
 884                    (function-item gnus-thread-sort-by-date)
 885                    (function-item gnus-thread-sort-by-score)
 886                    (function-item gnus-thread-sort-by-most-recent-number)
 887                    (function-item gnus-thread-sort-by-most-recent-date)
 888                    (function-item gnus-thread-sort-by-random)
 889                    (function-item gnus-thread-sort-by-total-score)
 890                    (function :tag "other"))
 891            (boolean :tag "Reverse order"))))
 892
 893 (defcustom gnus-subthread-sort-functions 'gnus-thread-sort-functions
 894   "*List of functions used for sorting subthreads in the summary buffer.
 895 By default, subthreads are sorted the same as threads, i.e.,
 896 according to the value of `gnus-thread-sort-functions'."
 897   :version "24.4"
 898   :group 'gnus-summary-sort
 899   :type '(choice
 900           (const :tag "Sort subthreads like threads" gnus-thread-sort-functions)
 901           (repeat
 902            (gnus-widget-reversible
 903             (choice (function-item gnus-thread-sort-by-number)
 904                     (function-item gnus-thread-sort-by-author)
 905                     (function-item gnus-thread-sort-by-recipient)
 906                     (function-item gnus-thread-sort-by-subject)
 907                     (function-item gnus-thread-sort-by-date)
 908                     (function-item gnus-thread-sort-by-score)
 909                     (function-item gnus-thread-sort-by-most-recent-number)
 910                     (function-item gnus-thread-sort-by-most-recent-date)
 911                     (function-item gnus-thread-sort-by-random)
 912                     (function-item gnus-thread-sort-by-total-score)
 913                     (function :tag "other"))
 914             (boolean :tag "Reverse order")))))
 915
 916 (defcustom gnus-thread-score-function '+
 917   "*Function used for calculating the total score of a thread.
 918
 919 The function is called with the scores of the article and each
 920 subthread and should then return the score of the thread.
 921
 922 Some functions you can use are `+', `max', or `min'."
 923   :group 'gnus-summary-sort
 924   :type 'function)
 925
 926 (defcustom gnus-summary-expunge-below nil
 927   "All articles that have a score less than this variable will be expunged.
 928 This variable is local to the summary buffers."
 929   :group 'gnus-score-default
 930   :type '(choice (const :tag "off" nil)
 931                  integer))
 932
 933 (defcustom gnus-thread-expunge-below nil
 934   "All threads that have a total score less than this variable will be expunged.
 935 See `gnus-thread-score-function' for en explanation of what a
 936 \"thread score\" is.
 937
 938 This variable is local to the summary buffers."
 939   :group 'gnus-threading
 940   :group 'gnus-score-default
 941   :type '(choice (const :tag "off" nil)
 942                  integer))
 943
 944 (defcustom gnus-summary-mode-hook nil
 945   "*A hook for Gnus summary mode.
 946 This hook is run before any variables are set in the summary buffer."
 947   :options '(turn-on-gnus-mailing-list-mode gnus-pick-mode)
 948   :group 'gnus-summary-various
 949   :type 'hook)
 950
 951 ;; Extracted from gnus-xmas-redefine in order to preserve user settings
 952 (when (featurep 'xemacs)
 953   (add-hook 'gnus-summary-mode-hook 'gnus-xmas-summary-menu-add)
 954   (add-hook 'gnus-summary-mode-hook 'gnus-xmas-setup-summary-toolbar)
 955   (add-hook 'gnus-summary-mode-hook
 956             'gnus-xmas-switch-horizontal-scrollbar-off))
 957
 958 (defcustom gnus-summary-menu-hook nil
 959   "*Hook run after the creation of the summary mode menu."
 960   :group 'gnus-summary-visual
 961   :type 'hook)
 962
 963 (defcustom gnus-summary-exit-hook nil
 964   "*A hook called on exit from the summary buffer.
 965 It will be called with point in the group buffer."
 966   :group 'gnus-summary-exit
 967   :type 'hook)
 968
 969 (defcustom gnus-summary-prepare-hook nil
 970   "*A hook called after the summary buffer has been generated.
 971 If you want to modify the summary buffer, you can use this hook."
 972   :group 'gnus-summary-various
 973   :type 'hook)
 974
 975 (defcustom gnus-summary-prepared-hook nil
 976   "*A hook called as the last thing after the summary buffer has been generated."
 977   :group 'gnus-summary-various
 978   :type 'hook)
 979
 980 (defcustom gnus-summary-generate-hook nil
 981   "*A hook run just before generating the summary buffer.
 982 This hook is commonly used to customize threading variables and the
 983 like."
 984   :group 'gnus-summary-various
 985   :type 'hook)
 986
 987 (defcustom gnus-select-group-hook nil
 988   "*A hook called when a newsgroup is selected.
 989
 990 If you'd like to simplify subjects like the
 991 `gnus-summary-next-same-subject' command does, you can use the
 992 following hook:
 993
 994  (add-hook gnus-select-group-hook
 995            (lambda ()
 996              (mapcar (lambda (header)
 997                        (mail-header-set-subject
 998                         header
 999                         (gnus-simplify-subject
1000                          (mail-header-subject header) 're-only)))
1001                      gnus-newsgroup-headers)))"
1002   :group 'gnus-group-select
1003   :type 'hook)
1004
1005 (defcustom gnus-select-article-hook nil
1006   "*A hook called when an article is selected."
1007   :group 'gnus-summary-choose
1008   :options '(gnus-agent-fetch-selected-article)
1009   :type 'hook)
1010
1011 (defcustom gnus-visual-mark-article-hook
1012   (list 'gnus-highlight-selected-summary)
1013   "*Hook run after selecting an article in the summary buffer.
1014 It is meant to be used for highlighting the article in some way.  It
1015 is not run if `gnus-visual' is nil."
1016   :group 'gnus-summary-visual
1017   :type 'hook)
1018
1019 (defcustom gnus-parse-headers-hook nil
1020   "*A hook called before parsing the headers."
1021   :group 'gnus-various
1022   :type 'hook)
1023
1024 (defcustom gnus-exit-group-hook nil
1025   "*A hook called when exiting summary mode.
1026 This hook is not called from the non-updating exit commands like `Q'."
1027   :group 'gnus-various
1028   :type 'hook)
1029
1030 (defcustom gnus-summary-update-hook nil
1031   "*A hook called when a summary line is changed.
1032 The hook will not be called if `gnus-visual' is nil.
1033
1034 The default function `gnus-summary-highlight-line' will
1035 highlight the line according to the `gnus-summary-highlight'
1036 variable."
1037   :group 'gnus-summary-visual
1038   :type 'hook)
1039
1040 (defcustom gnus-mark-article-hook '(gnus-summary-mark-read-and-unread-as-read)
1041   "*A hook called when an article is selected for the first time.
1042 The hook is intended to mark an article as read (or unread)
1043 automatically when it is selected."
1044   :group 'gnus-summary-choose
1045   :type 'hook)
1046
1047 (defcustom gnus-group-no-more-groups-hook nil
1048   "*A hook run when returning to group mode having no more (unread) groups."
1049   :group 'gnus-group-select
1050   :type 'hook)
1051
1052 (defcustom gnus-ps-print-hook nil
1053   "*A hook run before ps-printing something from Gnus."
1054   :group 'gnus-summary
1055   :type 'hook)
1056
1057 (defcustom gnus-summary-article-move-hook nil
1058   "*A hook called after an article is moved, copied, respooled, or crossposted."
1059   :version "22.1"
1060   :group 'gnus-summary
1061   :type 'hook)
1062
1063 (defcustom gnus-summary-article-delete-hook nil
1064   "*A hook called after an article is deleted."
1065   :version "22.1"
1066   :group 'gnus-summary
1067   :type 'hook)
1068
1069 (defcustom gnus-summary-article-expire-hook nil
1070   "*A hook called after an article is expired."
1071   :version "22.1"
1072   :group 'gnus-summary
1073   :type 'hook)
1074
1075 (defcustom gnus-summary-display-arrow
1076   (and (fboundp 'display-graphic-p)
1077        (display-graphic-p))
1078   "*If non-nil, display an arrow highlighting the current article."
1079   :version "22.1"
1080   :group 'gnus-summary
1081   :type 'boolean)
1082
1083 (defcustom gnus-summary-selected-face 'gnus-summary-selected
1084   "Face used for highlighting the current article in the summary buffer."
1085   :group 'gnus-summary-visual
1086   :type 'face)
1087
1088 (defvar gnus-tmp-downloaded nil)
1089
1090 (defcustom gnus-summary-highlight
1091   '(((eq mark gnus-canceled-mark)
1092      . gnus-summary-cancelled)
1093     ((and uncached (> score default-high))
1094      . gnus-summary-high-undownloaded)
1095     ((and uncached (< score default-low))
1096      . gnus-summary-low-undownloaded)
1097     (uncached
1098      . gnus-summary-normal-undownloaded)
1099     ((and (> score default-high)
1100           (or (eq mark gnus-dormant-mark)
1101               (eq mark gnus-ticked-mark)))
1102      . gnus-summary-high-ticked)
1103     ((and (< score default-low)
1104           (or (eq mark gnus-dormant-mark)
1105               (eq mark gnus-ticked-mark)))
1106      . gnus-summary-low-ticked)
1107     ((or (eq mark gnus-dormant-mark)
1108          (eq mark gnus-ticked-mark))
1109      . gnus-summary-normal-ticked)
1110     ((and (> score default-high) (eq mark gnus-ancient-mark))
1111      . gnus-summary-high-ancient)
1112     ((and (< score default-low) (eq mark gnus-ancient-mark))
1113      . gnus-summary-low-ancient)
1114     ((eq mark gnus-ancient-mark)
1115      . gnus-summary-normal-ancient)
1116     ((and (> score default-high) (eq mark gnus-unread-mark))
1117      . gnus-summary-high-unread)
1118     ((and (< score default-low) (eq mark gnus-unread-mark))
1119      . gnus-summary-low-unread)
1120     ((eq mark gnus-unread-mark)
1121      . gnus-summary-normal-unread)
1122     ((> score default-high)
1123      . gnus-summary-high-read)
1124     ((< score default-low)
1125      . gnus-summary-low-read)
1126     (t
1127      . gnus-summary-normal-read))
1128   "*Controls the highlighting of summary buffer lines.
1129
1130 A list of (FORM . FACE) pairs.  When deciding how a particular
1131 summary line should be displayed, each form is evaluated.  The content
1132 of the face field after the first true form is used.  You can change
1133 how those summary lines are displayed, by editing the face field.
1134
1135 You can use the following variables in the FORM field.
1136
1137 score:        The article's score.
1138 default:      The default article score.
1139 default-high: The default score for high scored articles.
1140 default-low:  The default score for low scored articles.
1141 mark:         The article's mark.
1142 uncached:     Non-nil if the article is uncached."
1143   :group 'gnus-summary-visual
1144   :type '(repeat (cons (sexp :tag "Form" nil)
1145                        face)))
1146 (put 'gnus-summary-highlight 'risky-local-variable t)
1147
1148 (defcustom gnus-alter-header-function nil
1149   "Function called to allow alteration of article header structures.
1150 The function is called with one parameter, the article header vector,
1151 which it may alter in any way."
1152   :type '(choice (const :tag "None" nil)
1153                  function)
1154   :group 'gnus-summary)
1155
1156 (defvar gnus-decode-encoded-word-function 'mail-decode-encoded-word-string
1157   "Function used to decode a string with encoded words.")
1158
1159 (defvar gnus-decode-encoded-address-function
1160   'mail-decode-encoded-address-string
1161   "Function used to decode addresses with encoded words.")
1162
1163 (defcustom gnus-extra-headers '(To Cc Keywords Gcc Newsgroups X-GM-LABELS)
1164   "*Extra headers to parse."
1165   :version "25.1"
1166   :group 'gnus-summary
1167   :type '(repeat symbol))
1168
1169 (defcustom gnus-ignored-from-addresses
1170   (and user-mail-address
1171        (not (string= user-mail-address ""))
1172        (regexp-quote user-mail-address))
1173   "*From headers that may be suppressed in favor of To headers.
1174 This can be a regexp or a list of regexps."
1175   :version "21.1"
1176   :group 'gnus-summary
1177   :type '(choice regexp
1178                  (repeat :tag "Regexp List" regexp)))
1179
1180 (defsubst gnus-ignored-from-addresses ()
1181   (gmm-regexp-concat gnus-ignored-from-addresses))
1182
1183 (defcustom gnus-summary-to-prefix "-> "
1184   "*String prefixed to the To field in the summary line when
1185 using `gnus-ignored-from-addresses'."
1186   :version "22.1"
1187   :group 'gnus-summary
1188   :type 'string)
1189
1190 (defcustom gnus-summary-newsgroup-prefix "=> "
1191   "*String prefixed to the Newsgroup field in the summary
1192 line when using the option `gnus-ignored-from-addresses'."
1193   :version "22.1"
1194   :group 'gnus-summary
1195   :type 'string)
1196
1197 (defcustom gnus-newsgroup-ignored-charsets '(unknown-8bit x-unknown)
1198   "List of charsets that should be ignored.
1199 When these charsets are used in the \"charset\" parameter, the
1200 default charset will be used instead."
1201   :version "21.1"
1202   :type '(repeat symbol)
1203   :group 'gnus-charset)
1204
1205 (defcustom gnus-newsgroup-maximum-articles nil
1206   "The maximum number of articles a newsgroup.
1207 If this is a number, old articles in a newsgroup exceeding this number
1208 are silently ignored.  If it is nil, no article is ignored.  Note that
1209 setting this variable to a number might prevent you from reading very
1210 old articles."
1211   :group 'gnus-group-select
1212   :version "22.2"
1213   :type '(choice (const :tag "No limit" nil)
1214                  integer))
1215
1216 (gnus-define-group-parameter
1217  ignored-charsets
1218  :type list
1219  :function-document
1220  "Return the ignored charsets of GROUP."
1221  :variable gnus-group-ignored-charsets-alist
1222  :variable-default
1223  '(("alt\\.chinese\\.text" iso-8859-1))
1224  :variable-document
1225  "Alist of regexps (to match group names) and charsets that should be ignored.
1226 When these charsets are used in the \"charset\" parameter, the
1227 default charset will be used instead."
1228  :variable-group gnus-charset
1229  :variable-type '(repeat (cons (regexp :tag "Group")
1230                                (repeat symbol)))
1231  :parameter-type '(choice :tag "Ignored charsets"
1232                           :value nil
1233                           (repeat (symbol)))
1234  :parameter-document       "\
1235 List of charsets that should be ignored.
1236
1237 When these charsets are used in the \"charset\" parameter, the
1238 default charset will be used instead.")
1239
1240 (defcustom gnus-group-highlight-words-alist nil
1241   "Alist of group regexps and highlight regexps.
1242 This variable uses the same syntax as `gnus-emphasis-alist'."
1243   :version "21.1"
1244   :type '(repeat (cons (regexp :tag "Group")
1245                        (repeat (list (regexp :tag "Highlight regexp")
1246                                      (number :tag "Group for entire word" 0)
1247                                      (number :tag "Group for displayed part" 0)
1248                                      (symbol :tag "Face"
1249                                              gnus-emphasis-highlight-words)))))
1250   :group 'gnus-summary-visual)
1251
1252 (defcustom gnus-summary-show-article-charset-alist
1253   nil
1254   "Alist of number and charset.
1255 The article will be shown with the charset corresponding to the
1256 numbered argument.
1257 For example: ((1 . cn-gb-2312) (2 . big5))."
1258   :version "21.1"
1259   :type '(repeat (cons (number :tag "Argument" 1)
1260                        (symbol :tag "Charset")))
1261   :group 'gnus-charset)
1262
1263 (defcustom gnus-preserve-marks t
1264   "Whether marks are preserved when moving, copying and respooling messages."
1265   :version "21.1"
1266   :type 'boolean
1267   :group 'gnus-summary-marks)
1268
1269 (defcustom gnus-alter-articles-to-read-function nil
1270   "Function to be called to alter the list of articles to be selected."
1271   :type '(choice (const nil) function)
1272   :group 'gnus-summary)
1273
1274 (defcustom gnus-orphan-score nil
1275   "*All orphans get this score added.  Set in the score file."
1276   :group 'gnus-score-default
1277   :type '(choice (const nil)
1278                  integer))
1279
1280 (defcustom gnus-summary-save-parts-default-mime "image/.*"
1281   "*A regexp to match MIME parts when saving multiple parts of a
1282 message with `gnus-summary-save-parts' (\\<gnus-summary-mode-map>\\[gnus-summary-save-parts]).
1283 This regexp will be used by default when prompting the user for which
1284 type of files to save."
1285   :group 'gnus-summary
1286   :type 'regexp)
1287
1288 (defcustom gnus-read-all-available-headers nil
1289   "Whether Gnus should parse all headers made available to it.
1290 This is mostly relevant for slow back ends where the user may
1291 wish to widen the summary buffer to include all headers
1292 that were fetched."
1293   :version "22.1"
1294   :group 'gnus-summary
1295   :type '(choice boolean regexp))
1296
1297 (defcustom gnus-summary-pipe-output-default-command nil
1298   "Command (and optional arguments) used to pipe article to subprocess.
1299 This will be used as the default command if it is non-nil.  The value
1300 will be updated if you modify it when executing the command
1301 `gnus-summary-pipe-output' or the function `gnus-summary-save-in-pipe'."
1302   :version "23.1" ;; No Gnus
1303   :group 'gnus-summary
1304   :type '(radio (const :tag "None" nil) (string :tag "Command")))
1305
1306 (defcustom gnus-summary-muttprint-program "muttprint"
1307   "Command (and optional arguments) used to run Muttprint.
1308 The value will be updated if you modify it when executing the command
1309 `gnus-summary-muttprint'."
1310   :version "22.1"
1311   :group 'gnus-summary
1312   :type 'string)
1313
1314 (defcustom gnus-article-loose-mime t
1315   "If non-nil, don't require MIME-Version header.
1316 Some brain-damaged MUA/MTA, e.g. Lotus Domino 5.0.6 clients, does not
1317 supply the MIME-Version header or deliberately strip it from the mail.
1318 If non-nil (the default), Gnus will treat some articles as MIME
1319 even if the MIME-Version header is missing."
1320   :version "22.1"
1321   :type 'boolean
1322   :group 'gnus-article-mime)
1323
1324 (defcustom gnus-article-emulate-mime t
1325   "If non-nil, use MIME emulation for uuencode and the like.
1326 This means that Gnus will search message bodies for text that look
1327 like uuencoded bits, yEncoded bits, and so on, and present that using
1328 the normal Gnus MIME machinery."
1329   :version "22.1"
1330   :type 'boolean
1331   :group 'gnus-article-mime)
1332
1333 ;;; Internal variables
1334
1335 (defvar gnus-summary-display-cache nil)
1336 (defvar gnus-article-mime-handles nil)
1337 (defvar gnus-article-decoded-p nil)
1338 (defvar gnus-article-charset nil)
1339 (defvar gnus-article-ignored-charsets nil)
1340 (defvar gnus-scores-exclude-files nil)
1341 (defvar gnus-page-broken nil)
1342
1343 (defvar gnus-original-article nil)
1344 (defvar gnus-article-internal-prepare-hook nil)
1345 (defvar gnus-newsgroup-process-stack nil)
1346
1347 (defvar gnus-thread-indent-array nil)
1348 (defvar gnus-thread-indent-array-level gnus-thread-indent-level)
1349 (defvar gnus-sort-gathered-threads-function 'gnus-thread-sort-by-number
1350   "Function called to sort the articles within a thread after it has been gathered together.")
1351
1352 (defvar gnus-summary-save-parts-type-history nil)
1353 (defvar gnus-summary-save-parts-last-directory mm-default-directory)
1354
1355 ;; Avoid highlighting in kill files.
1356 (defvar gnus-summary-inhibit-highlight nil)
1357 (defvar gnus-newsgroup-selected-overlay nil)
1358 (defvar gnus-inhibit-limiting nil)
1359 (defvar gnus-newsgroup-adaptive-score-file nil)
1360 (defvar gnus-current-score-file nil)
1361 (defvar gnus-current-move-group nil)
1362 (defvar gnus-current-copy-group nil)
1363 (defvar gnus-current-crosspost-group nil)
1364 (defvar gnus-newsgroup-display nil)
1365
1366 (defvar gnus-newsgroup-dependencies nil)
1367 (defvar gnus-newsgroup-adaptive nil)
1368 (defvar gnus-summary-display-article-function nil)
1369 (defvar gnus-summary-highlight-line-function nil
1370   "Function called after highlighting a summary line.")
1371
1372 (defvar gnus-summary-line-format-alist
1373   `((?N ,(macroexpand '(mail-header-number gnus-tmp-header)) ?d)
1374     (?S ,(macroexpand '(mail-header-subject gnus-tmp-header)) ?s)
1375     (?s gnus-tmp-subject-or-nil ?s)
1376     (?n gnus-tmp-name ?s)
1377     (?A (car (cdr (funcall gnus-extract-address-components gnus-tmp-from)))
1378         ?s)
1379     (?a (or (car (funcall gnus-extract-address-components gnus-tmp-from))
1380             gnus-tmp-from) ?s)
1381     (?F gnus-tmp-from ?s)
1382     (?x ,(macroexpand '(mail-header-xref gnus-tmp-header)) ?s)
1383     (?D ,(macroexpand '(mail-header-date gnus-tmp-header)) ?s)
1384     (?d (gnus-dd-mmm (mail-header-date gnus-tmp-header)) ?s)
1385     (?o (gnus-date-iso8601 (mail-header-date gnus-tmp-header)) ?s)
1386     (?M ,(macroexpand '(mail-header-id gnus-tmp-header)) ?s)
1387     (?r ,(macroexpand '(mail-header-references gnus-tmp-header)) ?s)
1388     (?c (or (mail-header-chars gnus-tmp-header) 0) ?d)
1389     (?k (gnus-summary-line-message-size gnus-tmp-header) ?s)
1390     (?L gnus-tmp-lines ?s)
1391     (?Z (or (nnir-article-rsv (mail-header-number gnus-tmp-header))
1392             0) ?d)
1393     (?G (or (nnir-article-group (mail-header-number gnus-tmp-header))
1394             "") ?s)
1395     (?g (or (gnus-group-short-name
1396              (nnir-article-group (mail-header-number gnus-tmp-header)))
1397             "") ?s)
1398     (?O gnus-tmp-downloaded ?c)
1399     (?I gnus-tmp-indentation ?s)
1400     (?T (if (= gnus-tmp-level 0) "" (make-string (frame-width) ? )) ?s)
1401     (?R gnus-tmp-replied ?c)
1402     (?\[ gnus-tmp-opening-bracket ?c)
1403     (?\] gnus-tmp-closing-bracket ?c)
1404     (?\> (make-string gnus-tmp-level ? ) ?s)
1405     (?\< (make-string (max 0 (- 20 gnus-tmp-level)) ? ) ?s)
1406     (?i gnus-tmp-score ?d)
1407     (?z gnus-tmp-score-char ?c)
1408     (?V (gnus-thread-total-score (and (boundp 'thread) (car thread))) ?d)
1409     (?U gnus-tmp-unread ?c)
1410     (?f (gnus-summary-from-or-to-or-newsgroups gnus-tmp-header gnus-tmp-from)
1411         ?s)
1412     (?t (gnus-summary-number-of-articles-in-thread
1413          (and (boundp 'thread) (car thread)) gnus-tmp-level)
1414         ?d)
1415     (?e (gnus-summary-number-of-articles-in-thread
1416          (and (boundp 'thread) (car thread)) gnus-tmp-level t)
1417         ?c)
1418     (?u gnus-tmp-user-defined ?s)
1419     (?P (gnus-pick-line-number) ?d)
1420     (?B gnus-tmp-thread-tree-header-string ?s)
1421     (user-date (gnus-user-date
1422                 ,(macroexpand '(mail-header-date gnus-tmp-header))) ?s))
1423   "An alist of format specifications that can appear in summary lines.
1424 These are paired with what variables they correspond with, along with
1425 the type of the variable (string, integer, character, etc).")
1426
1427 (defvar gnus-summary-dummy-line-format-alist
1428   `((?S gnus-tmp-subject ?s)
1429     (?N gnus-tmp-number ?d)
1430     (?u gnus-tmp-user-defined ?s)))
1431
1432 (defvar gnus-summary-mode-line-format-alist
1433   `((?G gnus-tmp-group-name ?s)
1434     (?g (gnus-short-group-name gnus-tmp-group-name) ?s)
1435     (?p (gnus-group-real-name gnus-tmp-group-name) ?s)
1436     (?A gnus-tmp-article-number ?d)
1437     (?Z gnus-tmp-unread-and-unselected ?s)
1438     (?V gnus-version ?s)
1439     (?U gnus-tmp-unread-and-unticked ?d)
1440     (?S gnus-tmp-subject ?s)
1441     (?e gnus-tmp-unselected ?d)
1442     (?u gnus-tmp-user-defined ?s)
1443     (?d (length gnus-newsgroup-dormant) ?d)
1444     (?t (length gnus-newsgroup-marked) ?d)
1445     (?h (length gnus-newsgroup-spam-marked) ?d)
1446     (?r (length gnus-newsgroup-reads) ?d)
1447     (?z (gnus-summary-article-score gnus-tmp-article-number) ?d)
1448     (?E gnus-newsgroup-expunged-tally ?d)
1449     (?s (gnus-current-score-file-nondirectory) ?s)))
1450
1451 ;; This is here rather than in gnus-art for compilation reasons.
1452 (defvar gnus-article-mode-line-format-alist
1453   (nconc '((?w (gnus-article-wash-status) ?s)
1454            (?m (gnus-article-mime-part-status) ?s))
1455          gnus-summary-mode-line-format-alist))
1456
1457 (defvar gnus-last-search-regexp nil
1458   "Default regexp for article search command.")
1459
1460 (defvar gnus-last-shell-command nil
1461   "Default shell command on article.")
1462
1463 (defvar gnus-newsgroup-agentized nil
1464   "Locally bound in each summary buffer to indicate whether the server has been agentized.")
1465 (defvar gnus-newsgroup-begin nil)
1466 (defvar gnus-newsgroup-end nil)
1467 (defvar gnus-newsgroup-last-rmail nil)
1468 (defvar gnus-newsgroup-last-mail nil)
1469 (defvar gnus-newsgroup-last-folder nil)
1470 (defvar gnus-newsgroup-last-file nil)
1471 (defvar gnus-newsgroup-last-directory nil)
1472 (defvar gnus-newsgroup-auto-expire nil)
1473 (defvar gnus-newsgroup-active nil)
1474 (defvar gnus-newsgroup-highest nil)
1475
1476 (defvar gnus-newsgroup-data nil)
1477 (defvar gnus-newsgroup-data-reverse nil)
1478 (defvar gnus-newsgroup-limit nil)
1479 (defvar gnus-newsgroup-limits nil)
1480 (defvar gnus-summary-use-undownloaded-faces nil)
1481
1482 (defvar gnus-newsgroup-unreads nil
1483   "Sorted list of unread articles in the current newsgroup.")
1484
1485 (defvar gnus-newsgroup-unselected nil
1486   "Sorted list of unselected unread articles in the current newsgroup.")
1487
1488 (defvar gnus-newsgroup-reads nil
1489   "Alist of read articles and article marks in the current newsgroup.")
1490
1491 (defvar gnus-newsgroup-expunged-tally nil)
1492
1493 (defvar gnus-newsgroup-marked nil
1494   "Sorted list of ticked articles in the current newsgroup (a subset of unread art).")
1495
1496 (defvar gnus-newsgroup-spam-marked nil
1497   "List of ranges of articles that have been marked as spam.")
1498
1499 (defvar gnus-newsgroup-killed nil
1500   "List of ranges of articles that have been through the scoring process.")
1501
1502 (defvar gnus-newsgroup-cached nil
1503   "Sorted list of articles that come from the article cache.")
1504
1505 (defvar gnus-newsgroup-saved nil
1506   "List of articles that have been saved.")
1507
1508 (defvar gnus-newsgroup-kill-headers nil)
1509
1510 (defvar gnus-newsgroup-replied nil
1511   "List of articles that have been replied to in the current newsgroup.")
1512
1513 (defvar gnus-newsgroup-forwarded nil
1514   "List of articles that have been forwarded in the current newsgroup.")
1515
1516 (defvar gnus-newsgroup-expirable nil
1517   "Sorted list of articles in the current newsgroup that can be expired.")
1518
1519 (defvar gnus-newsgroup-processable nil
1520   "List of articles in the current newsgroup that can be processed.")
1521
1522 (defvar gnus-newsgroup-downloadable nil
1523   "Sorted list of articles in the current newsgroup that can be processed.")
1524
1525 (defvar gnus-newsgroup-unfetched nil
1526   "Sorted list of articles in the current newsgroup whose headers have
1527 not been fetched into the agent.
1528
1529 This list will always be a subset of gnus-newsgroup-undownloaded.")
1530
1531 (defvar gnus-newsgroup-undownloaded nil
1532   "List of articles in the current newsgroup that haven't been downloaded.")
1533
1534 (defvar gnus-newsgroup-unsendable nil
1535   "List of articles in the current newsgroup that won't be sent.")
1536
1537 (defvar gnus-newsgroup-bookmarks nil
1538   "List of articles in the current newsgroup that have bookmarks.")
1539
1540 (defvar gnus-newsgroup-dormant nil
1541   "Sorted list of dormant articles in the current newsgroup.")
1542
1543 (defvar gnus-newsgroup-unseen nil
1544   "List of unseen articles in the current newsgroup.")
1545
1546 (defvar gnus-newsgroup-seen nil
1547   "Range of seen articles in the current newsgroup.")
1548
1549 (defvar gnus-newsgroup-unexist nil
1550   "Range of unexisting articles in the current newsgroup.")
1551
1552 (defvar gnus-newsgroup-articles nil
1553   "List of articles in the current newsgroup.")
1554
1555 (defvar gnus-newsgroup-scored nil
1556   "List of scored articles in the current newsgroup.")
1557
1558 (defvar gnus-newsgroup-headers nil
1559   "List of article headers in the current newsgroup.")
1560
1561 (defvar gnus-newsgroup-threads nil)
1562
1563 (defvar gnus-newsgroup-prepared nil
1564   "Whether the current group has been prepared properly.")
1565
1566 (defvar gnus-newsgroup-ancient nil
1567   "List of `gnus-fetch-old-headers' articles in the current newsgroup.")
1568
1569 (defvar gnus-newsgroup-sparse nil)
1570
1571 (defvar gnus-current-article nil)
1572 (defvar gnus-article-current nil)
1573 (defvar gnus-current-headers nil)
1574 (defvar gnus-have-all-headers nil)
1575 (defvar gnus-last-article nil)
1576 (defvar gnus-newsgroup-history nil)
1577 (defvar gnus-newsgroup-charset nil)
1578 (defvar gnus-newsgroup-ephemeral-charset nil)
1579 (defvar gnus-newsgroup-ephemeral-ignored-charsets nil)
1580
1581 (defvar gnus-article-before-search nil)
1582
1583 (defvar gnus-summary-local-variables
1584   '(gnus-newsgroup-name
1585
1586     ;; Marks lists
1587     gnus-newsgroup-unreads
1588     gnus-newsgroup-unselected
1589     gnus-newsgroup-marked
1590     gnus-newsgroup-spam-marked
1591     gnus-newsgroup-reads
1592     gnus-newsgroup-saved
1593     gnus-newsgroup-replied
1594     gnus-newsgroup-forwarded
1595     gnus-newsgroup-expirable
1596     gnus-newsgroup-killed
1597     gnus-newsgroup-unseen
1598     gnus-newsgroup-seen
1599     gnus-newsgroup-unexist
1600     gnus-newsgroup-cached
1601     gnus-newsgroup-downloadable
1602     gnus-newsgroup-undownloaded
1603     gnus-newsgroup-unsendable
1604
1605     gnus-newsgroup-begin gnus-newsgroup-end
1606     gnus-newsgroup-last-rmail gnus-newsgroup-last-mail
1607     gnus-newsgroup-last-folder gnus-newsgroup-last-file
1608     gnus-newsgroup-last-directory
1609     gnus-newsgroup-auto-expire
1610     gnus-newsgroup-processable
1611     gnus-newsgroup-unfetched
1612     gnus-newsgroup-articles
1613     gnus-newsgroup-bookmarks gnus-newsgroup-dormant
1614     gnus-newsgroup-headers gnus-newsgroup-threads
1615     gnus-newsgroup-prepared gnus-summary-highlight-line-function
1616     gnus-current-article gnus-current-headers gnus-have-all-headers
1617     gnus-last-article gnus-article-internal-prepare-hook
1618     (gnus-summary-article-delete-hook . global)
1619     (gnus-summary-article-move-hook . global)
1620     gnus-newsgroup-dependencies gnus-newsgroup-selected-overlay
1621     gnus-newsgroup-scored gnus-newsgroup-kill-headers
1622     gnus-thread-expunge-below
1623     gnus-score-alist gnus-current-score-file
1624     (gnus-summary-expunge-below . global)
1625     (gnus-summary-mark-below . global)
1626     (gnus-orphan-score . global)
1627     gnus-newsgroup-active gnus-scores-exclude-files
1628     gnus-newsgroup-highest
1629     gnus-newsgroup-history gnus-newsgroup-ancient
1630     gnus-newsgroup-sparse gnus-newsgroup-process-stack
1631     (gnus-newsgroup-adaptive . gnus-use-adaptive-scoring)
1632     gnus-newsgroup-adaptive-score-file (gnus-reffed-article-number . -1)
1633     (gnus-newsgroup-expunged-tally . 0)
1634     gnus-cache-removable-articles
1635     gnus-newsgroup-data gnus-newsgroup-data-reverse
1636     gnus-newsgroup-limit gnus-newsgroup-limits
1637     gnus-newsgroup-charset gnus-newsgroup-display
1638     gnus-summary-use-undownloaded-faces)
1639   "Variables that are buffer-local to the summary buffers.")
1640
1641 (defvar gnus-newsgroup-variables nil
1642   "A list of variables that have separate values in different newsgroups.
1643 A list of newsgroup (summary buffer) local variables, or cons of
1644 variables and their default expressions to be evalled (when the default
1645 values are not nil), that should be made global while the summary buffer
1646 is active.
1647
1648 Note: The default expressions will be evaluated (using function `eval')
1649 before assignment to the local variable rather than just assigned to it.
1650 If the default expression is the symbol `global', that symbol will not
1651 be evaluated but the global value of the local variable will be used
1652 instead.
1653
1654 These variables can be used to set variables in the group parameters
1655 while still allowing them to affect operations done in other buffers.
1656 For example:
1657
1658 \(setq gnus-newsgroup-variables
1659      '(message-use-followup-to
1660        (gnus-visible-headers .
1661          \"^From:\\\\|^Newsgroups:\\\\|^Subject:\\\\|^Date:\\\\|^To:\")))
1662 ")
1663
1664 (eval-when-compile
1665   ;; Bind features so that require will believe that gnus-sum has
1666   ;; already been loaded (avoids infinite recursion)
1667   (let ((features (cons 'gnus-sum features)))
1668     (require 'gnus-art)))
1669
1670 ;; MIME stuff.
1671
1672 (defvar gnus-decode-encoded-word-methods
1673   '(mail-decode-encoded-word-string)
1674   "List of methods used to decode encoded words.
1675
1676 This variable is a list of FUNCTION or (REGEXP . FUNCTION).  If item
1677 is FUNCTION, FUNCTION will be apply to all newsgroups.  If item is a
1678 \(REGEXP . FUNCTION), FUNCTION will be applied only to the newsgroups
1679 whose names match REGEXP.
1680
1681 For example:
1682 \((\"chinese\" . gnus-decode-encoded-word-string-by-guess)
1683  mail-decode-encoded-word-string
1684  (\"chinese\" . rfc1843-decode-string))")
1685
1686 (defvar gnus-decode-encoded-word-methods-cache nil)
1687
1688 (defun gnus-multi-decode-encoded-word-string (string)
1689   "Apply the functions from `gnus-encoded-word-methods' that match."
1690   (unless (and gnus-decode-encoded-word-methods-cache
1691                (eq gnus-newsgroup-name
1692                    (car gnus-decode-encoded-word-methods-cache)))
1693     (setq gnus-decode-encoded-word-methods-cache (list gnus-newsgroup-name))
1694     (dolist (method gnus-decode-encoded-word-methods)
1695       (if (symbolp method)
1696           (nconc gnus-decode-encoded-word-methods-cache (list method))
1697         (if (and gnus-newsgroup-name
1698                  (string-match (car method) gnus-newsgroup-name))
1699             (nconc gnus-decode-encoded-word-methods-cache
1700                    (list (cdr method)))))))
1701   (dolist (method (cdr gnus-decode-encoded-word-methods-cache) string)
1702     (setq string (funcall method string))))
1703
1704 ;; Subject simplification.
1705
1706 (defun gnus-simplify-whitespace (str)
1707   "Remove excessive whitespace from STR."
1708   ;; Multiple spaces.
1709   (while (string-match "[ \t][ \t]+" str)
1710     (setq str (concat (substring str 0 (match-beginning 0))
1711                         " "
1712                         (substring str (match-end 0)))))
1713   ;; Leading spaces.
1714   (when (string-match "^[ \t]+" str)
1715     (setq str (substring str (match-end 0))))
1716   ;; Trailing spaces.
1717   (when (string-match "[ \t]+$" str)
1718     (setq str (substring str 0 (match-beginning 0))))
1719   str)
1720
1721 (defun gnus-simplify-all-whitespace (str)
1722   "Remove all whitespace from STR."
1723   (while (string-match "[ \t\n]+" str)
1724     (setq str (replace-match "" nil nil str)))
1725   str)
1726
1727 (defsubst gnus-simplify-subject-re (subject)
1728   "Remove \"Re:\" from subject lines."
1729   (if (string-match message-subject-re-regexp subject)
1730       (substring subject (match-end 0))
1731     subject))
1732
1733 (defun gnus-simplify-subject (subject &optional re-only)
1734   "Remove `Re:' and words in parentheses.
1735 If RE-ONLY is non-nil, strip leading `Re:'s only."
1736   (let ((case-fold-search t))           ;Ignore case.
1737     ;; Remove `Re:', `Re^N:', `Re(n)', and `Re[n]:'.
1738     (when (string-match "\\`\\(re\\([[(^][0-9]+[])]?\\)?:[ \t]*\\)+" subject)
1739       (setq subject (substring subject (match-end 0))))
1740     ;; Remove uninteresting prefixes.
1741     (when (and (not re-only)
1742                gnus-simplify-ignored-prefixes
1743                (string-match gnus-simplify-ignored-prefixes subject))
1744       (setq subject (substring subject (match-end 0))))
1745     ;; Remove words in parentheses from end.
1746     (unless re-only
1747       (while (string-match "[ \t\n]*([^()]*)[ \t\n]*\\'" subject)
1748         (setq subject (substring subject 0 (match-beginning 0)))))
1749     ;; Return subject string.
1750     subject))
1751
1752 ;; Remove any leading "re:"s, any trailing paren phrases, and simplify
1753 ;; all whitespace.
1754 (defsubst gnus-simplify-buffer-fuzzy-step (regexp &optional newtext)
1755   (goto-char (point-min))
1756   (while (re-search-forward regexp nil t)
1757     (replace-match (or newtext ""))))
1758
1759 (defun gnus-simplify-buffer-fuzzy (regexp)
1760   "Simplify string in the buffer fuzzily.
1761 The string in the accessible portion of the current buffer is simplified.
1762 It is assumed to be a single-line subject.
1763 Whitespace is generally cleaned up, and miscellaneous leading/trailing
1764 matter is removed.  Additional things can be deleted by setting
1765 `gnus-simplify-subject-fuzzy-regexp'."
1766   (let ((case-fold-search t)
1767         (modified-tick))
1768     (gnus-simplify-buffer-fuzzy-step "\t" " ")
1769
1770     (while (not (eq modified-tick (buffer-modified-tick)))
1771       (setq modified-tick (buffer-modified-tick))
1772       (cond
1773        ((listp regexp)
1774         (mapc 'gnus-simplify-buffer-fuzzy-step regexp))
1775        (regexp
1776         (gnus-simplify-buffer-fuzzy-step regexp)))
1777       (gnus-simplify-buffer-fuzzy-step "^ *\\[[-+?*!][-+?*!]\\] *")
1778       (gnus-simplify-buffer-fuzzy-step
1779        "^ *\\(re\\|fw\\|fwd\\)[[{(^0-9]*[])}]?[:;] *")
1780       (gnus-simplify-buffer-fuzzy-step "^[[].*:\\( .*\\)[]]$" "\\1"))
1781
1782     (gnus-simplify-buffer-fuzzy-step " *[[{(][^()\n]*[]})] *$")
1783     (gnus-simplify-buffer-fuzzy-step "  +" " ")
1784     (gnus-simplify-buffer-fuzzy-step " $")
1785     (gnus-simplify-buffer-fuzzy-step "^ +")))
1786
1787 (defun gnus-simplify-subject-fuzzy (subject)
1788   "Simplify a subject string fuzzily.
1789 See `gnus-simplify-buffer-fuzzy' for details."
1790   (save-excursion
1791     (let ((regexp gnus-simplify-subject-fuzzy-regexp))
1792       (gnus-set-work-buffer)
1793       (let ((case-fold-search t))
1794         ;; Remove uninteresting prefixes.
1795         (when (and gnus-simplify-ignored-prefixes
1796                    (string-match gnus-simplify-ignored-prefixes subject))
1797           (setq subject (substring subject (match-end 0))))
1798         (insert subject)
1799         (inline (gnus-simplify-buffer-fuzzy regexp))
1800         (buffer-string)))))
1801
1802 (defsubst gnus-simplify-subject-fully (subject)
1803   "Simplify a subject string according to `gnus-summary-gather-subject-limit'."
1804   (cond
1805    (gnus-simplify-subject-functions
1806     (gnus-map-function gnus-simplify-subject-functions subject))
1807    ((null gnus-summary-gather-subject-limit)
1808     (gnus-simplify-subject-re subject))
1809    ((eq gnus-summary-gather-subject-limit 'fuzzy)
1810     (gnus-simplify-subject-fuzzy subject))
1811    ((numberp gnus-summary-gather-subject-limit)
1812     (truncate-string-to-width (gnus-simplify-subject-re subject)
1813                               gnus-summary-gather-subject-limit))
1814    (t
1815     subject)))
1816
1817 (defsubst gnus-subject-equal (s1 s2 &optional simple-first)
1818   "Check whether two subjects are equal.
1819 If optional argument SIMPLE-FIRST is t, first argument is already
1820 simplified."
1821   (cond
1822    ((null simple-first)
1823     (equal (gnus-simplify-subject-fully s1)
1824            (gnus-simplify-subject-fully s2)))
1825    (t
1826     (equal s1
1827            (gnus-simplify-subject-fully s2)))))
1828
1829 (defun gnus-summary-bubble-group ()
1830   "Increase the score of the current group.
1831 This is a handy function to add to `gnus-summary-exit-hook' to
1832 increase the score of each group you read."
1833   (gnus-group-add-score gnus-newsgroup-name))
1834
1835 \f
1836 ;;;
1837 ;;; Gnus summary mode
1838 ;;;
1839
1840 (put 'gnus-summary-mode 'mode-class 'special)
1841
1842 (defvar gnus-article-commands-menu)
1843
1844 ;; Non-orthogonal keys
1845
1846 (gnus-define-keys gnus-summary-mode-map
1847   " " gnus-summary-next-page
1848   [?\S-\ ] gnus-summary-prev-page
1849   "\177" gnus-summary-prev-page
1850   [delete] gnus-summary-prev-page
1851   "\r" gnus-summary-scroll-up
1852   "\M-\r" gnus-summary-scroll-down
1853   "n" gnus-summary-next-unread-article
1854   "p" gnus-summary-prev-unread-article
1855   "N" gnus-summary-next-article
1856   "P" gnus-summary-prev-article
1857   "\M-\C-n" gnus-summary-next-same-subject
1858   "\M-\C-p" gnus-summary-prev-same-subject
1859   "\M-n" gnus-summary-next-unread-subject
1860   "\M-p" gnus-summary-prev-unread-subject
1861   "." gnus-summary-first-unread-article
1862   "," gnus-summary-best-unread-article
1863   "\M-s" gnus-summary-search-article-forward
1864   "\M-r" gnus-summary-search-article-backward
1865   "\M-S" gnus-summary-repeat-search-article-forward
1866   "\M-R" gnus-summary-repeat-search-article-backward
1867   "<" gnus-summary-beginning-of-article
1868   ">" gnus-summary-end-of-article
1869   "j" gnus-summary-goto-article
1870   "^" gnus-summary-refer-parent-article
1871   "\M-^" gnus-summary-refer-article
1872   "u" gnus-summary-tick-article-forward
1873   "!" gnus-summary-tick-article-forward
1874   "U" gnus-summary-tick-article-backward
1875   "d" gnus-summary-mark-as-read-forward
1876   "D" gnus-summary-mark-as-read-backward
1877   "E" gnus-summary-mark-as-expirable
1878   "\M-u" gnus-summary-clear-mark-forward
1879   "\M-U" gnus-summary-clear-mark-backward
1880   "k" gnus-summary-kill-same-subject-and-select
1881   "\C-k" gnus-summary-kill-same-subject
1882   "\M-\C-k" gnus-summary-kill-thread
1883   "\M-\C-l" gnus-summary-lower-thread
1884   "e" gnus-summary-edit-article
1885   "#" gnus-summary-mark-as-processable
1886   "\M-#" gnus-summary-unmark-as-processable
1887   "\M-\C-t" gnus-summary-toggle-threads
1888   "\M-\C-s" gnus-summary-show-thread
1889   "\M-\C-h" gnus-summary-hide-thread
1890   "\M-\C-f" gnus-summary-next-thread
1891   "\M-\C-b" gnus-summary-prev-thread
1892   [(meta down)] gnus-summary-next-thread
1893   [(meta up)] gnus-summary-prev-thread
1894   "\M-\C-u" gnus-summary-up-thread
1895   "\M-\C-d" gnus-summary-down-thread
1896   "&" gnus-summary-execute-command
1897   "c" gnus-summary-catchup-and-exit
1898   "\C-w" gnus-summary-mark-region-as-read
1899   "\C-t" gnus-summary-toggle-truncation
1900   "?" gnus-summary-mark-as-dormant
1901   "\C-c\M-\C-s" gnus-summary-limit-include-expunged
1902   "\C-c\C-s\C-n" gnus-summary-sort-by-number
1903   "\C-c\C-s\C-m\C-n" gnus-summary-sort-by-most-recent-number
1904   "\C-c\C-s\C-l" gnus-summary-sort-by-lines
1905   "\C-c\C-s\C-c" gnus-summary-sort-by-chars
1906   "\C-c\C-s\C-a" gnus-summary-sort-by-author
1907   "\C-c\C-s\C-t" gnus-summary-sort-by-recipient
1908   "\C-c\C-s\C-s" gnus-summary-sort-by-subject
1909   "\C-c\C-s\C-d" gnus-summary-sort-by-date
1910   "\C-c\C-s\C-m\C-d" gnus-summary-sort-by-most-recent-date
1911   "\C-c\C-s\C-i" gnus-summary-sort-by-score
1912   "\C-c\C-s\C-o" gnus-summary-sort-by-original
1913   "\C-c\C-s\C-r" gnus-summary-sort-by-random
1914   "=" gnus-summary-expand-window
1915   "\C-x\C-s" gnus-summary-reselect-current-group
1916   "\M-g" gnus-summary-rescan-group
1917   "\C-c\C-r" gnus-summary-caesar-message
1918   "f" gnus-summary-followup
1919   "F" gnus-summary-followup-with-original
1920   "C" gnus-summary-cancel-article
1921   "r" gnus-summary-reply
1922   "R" gnus-summary-reply-with-original
1923   "\C-c\C-f" gnus-summary-mail-forward
1924   "o" gnus-summary-save-article
1925   "\C-o" gnus-summary-save-article-mail
1926   "|" gnus-summary-pipe-output
1927   "\M-k" gnus-summary-edit-local-kill
1928   "\M-K" gnus-summary-edit-global-kill
1929   ;; "V" gnus-version
1930   "\C-c\C-d" gnus-summary-describe-group
1931   "q" gnus-summary-exit
1932   "Q" gnus-summary-exit-no-update
1933   "\C-c\C-i" gnus-info-find-node
1934   gnus-mouse-2 gnus-mouse-pick-article
1935   [follow-link] mouse-face
1936   "m" gnus-summary-mail-other-window
1937   "a" gnus-summary-post-news
1938   "x" gnus-summary-limit-to-unread
1939   "s" gnus-summary-isearch-article
1940   "\t" gnus-summary-widget-forward
1941   [backtab] gnus-summary-widget-backward
1942   "t" gnus-summary-toggle-header
1943   "g" gnus-summary-show-article
1944   "l" gnus-summary-goto-last-article
1945   "\C-c\C-v\C-v" gnus-uu-decode-uu-view
1946   "\C-d" gnus-summary-enter-digest-group
1947   "\M-\C-d" gnus-summary-read-document
1948   "\M-\C-e" gnus-summary-edit-parameters
1949   "\M-\C-a" gnus-summary-customize-parameters
1950   "\C-c\C-b" gnus-bug
1951   "*" gnus-cache-enter-article
1952   "\M-*" gnus-cache-remove-article
1953   "\M-&" gnus-summary-universal-argument
1954   "\C-l" gnus-recenter
1955   "I" gnus-summary-increase-score
1956   "L" gnus-summary-lower-score
1957   "\M-i" gnus-symbolic-argument
1958   "h" gnus-summary-select-article-buffer
1959
1960   "b" gnus-article-view-part
1961   "\M-t" gnus-summary-toggle-display-buttonized
1962
1963   "V" gnus-summary-score-map
1964   "X" gnus-uu-extract-map
1965   "S" gnus-summary-send-map)
1966
1967 ;; Sort of orthogonal keymap
1968 (gnus-define-keys (gnus-summary-mark-map "M" gnus-summary-mode-map)
1969   "t" gnus-summary-tick-article-forward
1970   "!" gnus-summary-tick-article-forward
1971   "d" gnus-summary-mark-as-read-forward
1972   "r" gnus-summary-mark-as-read-forward
1973   "c" gnus-summary-clear-mark-forward
1974   " " gnus-summary-clear-mark-forward
1975   "e" gnus-summary-mark-as-expirable
1976   "x" gnus-summary-mark-as-expirable
1977   "?" gnus-summary-mark-as-dormant
1978   "b" gnus-summary-set-bookmark
1979   "B" gnus-summary-remove-bookmark
1980   "#" gnus-summary-mark-as-processable
1981   "\M-#" gnus-summary-unmark-as-processable
1982   "S" gnus-summary-limit-include-expunged
1983   "C" gnus-summary-catchup
1984   "H" gnus-summary-catchup-to-here
1985   "h" gnus-summary-catchup-from-here
1986   "\C-c" gnus-summary-catchup-all
1987   "k" gnus-summary-kill-same-subject-and-select
1988   "K" gnus-summary-kill-same-subject
1989   "P" gnus-uu-mark-map)
1990
1991 (gnus-define-keys (gnus-summary-mscore-map "V" gnus-summary-mark-map)
1992   "c" gnus-summary-clear-above
1993   "u" gnus-summary-tick-above
1994   "m" gnus-summary-mark-above
1995   "k" gnus-summary-kill-below)
1996
1997 (gnus-define-keys (gnus-summary-limit-map "/" gnus-summary-mode-map)
1998   "/" gnus-summary-limit-to-subject
1999   "n" gnus-summary-limit-to-articles
2000   "b" gnus-summary-limit-to-bodies
2001   "h" gnus-summary-limit-to-headers
2002   "w" gnus-summary-pop-limit
2003   "s" gnus-summary-limit-to-subject
2004   "a" gnus-summary-limit-to-author
2005   "u" gnus-summary-limit-to-unread
2006   "m" gnus-summary-limit-to-marks
2007   "M" gnus-summary-limit-exclude-marks
2008   "v" gnus-summary-limit-to-score
2009   "*" gnus-summary-limit-include-cached
2010   "D" gnus-summary-limit-include-dormant
2011   "T" gnus-summary-limit-include-thread
2012   "d" gnus-summary-limit-exclude-dormant
2013   "t" gnus-summary-limit-to-age
2014   "." gnus-summary-limit-to-unseen
2015   "x" gnus-summary-limit-to-extra
2016   "p" gnus-summary-limit-to-display-predicate
2017   "E" gnus-summary-limit-include-expunged
2018   "c" gnus-summary-limit-exclude-childless-dormant
2019   "C" gnus-summary-limit-mark-excluded-as-read
2020   "o" gnus-summary-insert-old-articles
2021   "N" gnus-summary-insert-new-articles
2022   "S" gnus-summary-limit-to-singletons
2023   "r" gnus-summary-limit-to-replied
2024   "R" gnus-summary-limit-to-recipient
2025   "A" gnus-summary-limit-to-address)
2026
2027 (gnus-define-keys (gnus-summary-goto-map "G" gnus-summary-mode-map)
2028   "n" gnus-summary-next-unread-article
2029   "p" gnus-summary-prev-unread-article
2030   "N" gnus-summary-next-article
2031   "P" gnus-summary-prev-article
2032   "\C-n" gnus-summary-next-same-subject
2033   "\C-p" gnus-summary-prev-same-subject
2034   "\M-n" gnus-summary-next-unread-subject
2035   "\M-p" gnus-summary-prev-unread-subject
2036   "f" gnus-summary-first-unread-article
2037   "b" gnus-summary-best-unread-article
2038   "j" gnus-summary-goto-article
2039   "g" gnus-summary-goto-subject
2040   "l" gnus-summary-goto-last-article
2041   "o" gnus-summary-pop-article)
2042
2043 (gnus-define-keys (gnus-summary-thread-map "T" gnus-summary-mode-map)
2044   "k" gnus-summary-kill-thread
2045   "E" gnus-summary-expire-thread
2046   "l" gnus-summary-lower-thread
2047   "i" gnus-summary-raise-thread
2048   "T" gnus-summary-toggle-threads
2049   "t" gnus-summary-rethread-current
2050   "^" gnus-summary-reparent-thread
2051   "\M-^" gnus-summary-reparent-children
2052   "s" gnus-summary-show-thread
2053   "S" gnus-summary-show-all-threads
2054   "h" gnus-summary-hide-thread
2055   "H" gnus-summary-hide-all-threads
2056   "n" gnus-summary-next-thread
2057   "p" gnus-summary-prev-thread
2058   "u" gnus-summary-up-thread
2059   "o" gnus-summary-top-thread
2060   "d" gnus-summary-down-thread
2061   "#" gnus-uu-mark-thread
2062   "\M-#" gnus-uu-unmark-thread)
2063
2064 (gnus-define-keys (gnus-summary-buffer-map "Y" gnus-summary-mode-map)
2065   "g" gnus-summary-prepare
2066   "c" gnus-summary-insert-cached-articles
2067   "d" gnus-summary-insert-dormant-articles
2068   "t" gnus-summary-insert-ticked-articles)
2069
2070 (gnus-define-keys (gnus-summary-exit-map "Z" gnus-summary-mode-map)
2071   "c" gnus-summary-catchup-and-exit
2072   "C" gnus-summary-catchup-all-and-exit
2073   "E" gnus-summary-exit-no-update
2074   "Q" gnus-summary-exit
2075   "Z" gnus-summary-exit
2076   "n" gnus-summary-catchup-and-goto-next-group
2077   "p" gnus-summary-catchup-and-goto-prev-group
2078   "R" gnus-summary-reselect-current-group
2079   "G" gnus-summary-rescan-group
2080   "N" gnus-summary-next-group
2081   "s" gnus-summary-save-newsrc
2082   "P" gnus-summary-prev-group)
2083
2084 (gnus-define-keys (gnus-summary-article-map "A" gnus-summary-mode-map)
2085   " " gnus-summary-next-page
2086   "n" gnus-summary-next-page
2087   [?\S-\ ] gnus-summary-prev-page
2088   "\177" gnus-summary-prev-page
2089   [delete] gnus-summary-prev-page
2090   "p" gnus-summary-prev-page
2091   "\r" gnus-summary-scroll-up
2092   "\M-\r" gnus-summary-scroll-down
2093   "<" gnus-summary-beginning-of-article
2094   ">" gnus-summary-end-of-article
2095   "b" gnus-summary-beginning-of-article
2096   "e" gnus-summary-end-of-article
2097   "^" gnus-summary-refer-parent-article
2098   "r" gnus-summary-refer-parent-article
2099   "C" gnus-summary-show-complete-article
2100   "D" gnus-summary-enter-digest-group
2101   "R" gnus-summary-refer-references
2102   "T" gnus-summary-refer-thread
2103   "W" gnus-warp-to-article
2104   "g" gnus-summary-show-article
2105   "s" gnus-summary-isearch-article
2106   "\t" gnus-summary-widget-forward
2107   [backtab] gnus-summary-widget-backward
2108   "P" gnus-summary-print-article
2109   "S" gnus-sticky-article
2110   "M" gnus-mailing-list-insinuate
2111   "t" gnus-article-babel)
2112
2113 (gnus-define-keys (gnus-summary-wash-map "W" gnus-summary-mode-map)
2114   "b" gnus-article-add-buttons
2115   "B" gnus-article-add-buttons-to-head
2116   "o" gnus-article-treat-overstrike
2117   "e" gnus-article-emphasize
2118   "w" gnus-article-fill-cited-article
2119   "Q" gnus-article-fill-long-lines
2120   "L" gnus-article-toggle-truncate-lines
2121   "C" gnus-article-capitalize-sentences
2122   "c" gnus-article-remove-cr
2123   "q" gnus-article-de-quoted-unreadable
2124   "6" gnus-article-de-base64-unreadable
2125   "Z" gnus-article-decode-HZ
2126   "A" gnus-article-treat-ansi-sequences
2127   "h" gnus-article-wash-html
2128   "u" gnus-article-unsplit-urls
2129   "s" gnus-summary-force-verify-and-decrypt
2130   "f" gnus-article-display-x-face
2131   "l" gnus-summary-stop-page-breaking
2132   "r" gnus-summary-caesar-message
2133   "m" gnus-summary-morse-message
2134   "t" gnus-summary-toggle-header
2135   "g" gnus-treat-smiley
2136   "v" gnus-summary-verbose-headers
2137   "a" gnus-article-strip-headers-in-body ;; mnemonic: wash archive
2138   "p" gnus-article-verify-x-pgp-sig
2139   "d" gnus-article-treat-dumbquotes
2140   "U" gnus-article-treat-non-ascii
2141   "i" gnus-summary-idna-message)
2142
2143 (gnus-define-keys (gnus-summary-wash-deuglify-map "Y" gnus-summary-wash-map)
2144   ;; mnemonic: deuglif*Y*
2145   "u" gnus-article-outlook-unwrap-lines
2146   "a" gnus-article-outlook-repair-attribution
2147   "c" gnus-article-outlook-rearrange-citation
2148   "f" gnus-article-outlook-deuglify-article) ;; mnemonic: full deuglify
2149
2150 (gnus-define-keys (gnus-summary-wash-hide-map "W" gnus-summary-wash-map)
2151   "a" gnus-article-hide
2152   "h" gnus-article-hide-headers
2153   "b" gnus-article-hide-boring-headers
2154   "s" gnus-article-hide-signature
2155   "c" gnus-article-hide-citation
2156   "C" gnus-article-hide-citation-in-followups
2157   "l" gnus-article-hide-list-identifiers
2158   "B" gnus-article-strip-banner
2159   "P" gnus-article-hide-pem
2160   "\C-c" gnus-article-hide-citation-maybe)
2161
2162 (gnus-define-keys (gnus-summary-wash-highlight-map "H" gnus-summary-wash-map)
2163   "a" gnus-article-highlight
2164   "h" gnus-article-highlight-headers
2165   "c" gnus-article-highlight-citation
2166   "s" gnus-article-highlight-signature)
2167
2168 (gnus-define-keys (gnus-summary-wash-header-map "G" gnus-summary-wash-map)
2169   "f" gnus-article-treat-fold-headers
2170   "u" gnus-article-treat-unfold-headers
2171   "n" gnus-article-treat-fold-newsgroups)
2172
2173 (gnus-define-keys (gnus-summary-wash-display-map "D" gnus-summary-wash-map)
2174   "x" gnus-article-display-x-face
2175   "d" gnus-article-display-face
2176   "s" gnus-treat-smiley
2177   "D" gnus-article-remove-images
2178   "W" gnus-article-show-images
2179   "f" gnus-treat-from-picon
2180   "m" gnus-treat-mail-picon
2181   "n" gnus-treat-newsgroups-picon
2182   "g" gnus-treat-from-gravatar
2183   "h" gnus-treat-mail-gravatar)
2184
2185 (gnus-define-keys (gnus-summary-wash-mime-map "M" gnus-summary-wash-map)
2186   "w" gnus-article-decode-mime-words
2187   "c" gnus-article-decode-charset
2188   "h" gnus-mime-buttonize-attachments-in-header
2189   "v" gnus-mime-view-all-parts
2190   "b" gnus-article-view-part)
2191
2192 (gnus-define-keys (gnus-summary-wash-time-map "T" gnus-summary-wash-map)
2193   "z" gnus-article-date-ut
2194   "u" gnus-article-date-ut
2195   "l" gnus-article-date-local
2196   "p" gnus-article-date-english
2197   "e" gnus-article-date-lapsed
2198   "o" gnus-article-date-original
2199   "i" gnus-article-date-iso8601
2200   "s" gnus-article-date-user)
2201
2202 (gnus-define-keys (gnus-summary-wash-empty-map "E" gnus-summary-wash-map)
2203   "t" gnus-article-remove-trailing-blank-lines
2204   "l" gnus-article-strip-leading-blank-lines
2205   "m" gnus-article-strip-multiple-blank-lines
2206   "a" gnus-article-strip-blank-lines
2207   "A" gnus-article-strip-all-blank-lines
2208   "s" gnus-article-strip-leading-space
2209   "e" gnus-article-strip-trailing-space
2210   "w" gnus-article-remove-leading-whitespace)
2211
2212 (gnus-define-keys (gnus-summary-help-map "H" gnus-summary-mode-map)
2213   "v" gnus-version
2214   "d" gnus-summary-describe-group
2215   "h" gnus-summary-describe-briefly
2216   "i" gnus-info-find-node)
2217
2218 (gnus-define-keys (gnus-summary-backend-map "B" gnus-summary-mode-map)
2219   "e" gnus-summary-expire-articles
2220   "\M-\C-e" gnus-summary-expire-articles-now
2221   "\177" gnus-summary-delete-article
2222   [delete] gnus-summary-delete-article
2223   "m" gnus-summary-move-article
2224   "r" gnus-summary-respool-article
2225   "w" gnus-summary-edit-article
2226   "c" gnus-summary-copy-article
2227   "B" gnus-summary-crosspost-article
2228   "q" gnus-summary-respool-query
2229   "t" gnus-summary-respool-trace
2230   "i" gnus-summary-import-article
2231   "I" gnus-summary-create-article
2232   "p" gnus-summary-article-posted-p)
2233
2234 (gnus-define-keys (gnus-summary-save-map "O" gnus-summary-mode-map)
2235   "o" gnus-summary-save-article
2236   "m" gnus-summary-save-article-mail
2237   "F" gnus-summary-write-article-file
2238   "r" gnus-summary-save-article-rmail
2239   "f" gnus-summary-save-article-file
2240   "b" gnus-summary-save-article-body-file
2241   "B" gnus-summary-write-article-body-file
2242   "h" gnus-summary-save-article-folder
2243   "v" gnus-summary-save-article-vm
2244   "p" gnus-summary-pipe-output
2245   "P" gnus-summary-muttprint)
2246
2247 (gnus-define-keys (gnus-summary-mime-map "K" gnus-summary-mode-map)
2248   "b" gnus-summary-display-buttonized
2249   "m" gnus-summary-repair-multipart
2250   "v" gnus-article-view-part
2251   "o" gnus-article-save-part
2252   "O" gnus-article-save-part-and-strip
2253   "r" gnus-article-replace-part
2254   "d" gnus-article-delete-part
2255   "t" gnus-article-view-part-as-type
2256   "j" gnus-article-jump-to-part
2257   "c" gnus-article-copy-part
2258   "C" gnus-article-view-part-as-charset
2259   "e" gnus-article-view-part-externally
2260   "H" gnus-article-browse-html-article
2261   "E" gnus-article-encrypt-body
2262   "i" gnus-article-inline-part
2263   "|" gnus-article-pipe-part)
2264
2265 (gnus-define-keys (gnus-uu-mark-map "P" gnus-summary-mark-map)
2266   "p" gnus-summary-mark-as-processable
2267   "u" gnus-summary-unmark-as-processable
2268   "U" gnus-summary-unmark-all-processable
2269   "v" gnus-uu-mark-over
2270   "s" gnus-uu-mark-series
2271   "r" gnus-uu-mark-region
2272   "g" gnus-uu-unmark-region
2273   "R" gnus-uu-mark-by-regexp
2274   "G" gnus-uu-unmark-by-regexp
2275   "t" gnus-uu-mark-thread
2276   "T" gnus-uu-unmark-thread
2277   "a" gnus-uu-mark-all
2278   "b" gnus-uu-mark-buffer
2279   "S" gnus-uu-mark-sparse
2280   "k" gnus-summary-kill-process-mark
2281   "y" gnus-summary-yank-process-mark
2282   "w" gnus-summary-save-process-mark
2283   "i" gnus-uu-invert-processable)
2284
2285 (gnus-define-keys (gnus-uu-extract-map "X" gnus-summary-mode-map)
2286   ;;"x" gnus-uu-extract-any
2287   "m" gnus-summary-save-parts
2288   "u" gnus-uu-decode-uu
2289   "U" gnus-uu-decode-uu-and-save
2290   "s" gnus-uu-decode-unshar
2291   "S" gnus-uu-decode-unshar-and-save
2292   "o" gnus-uu-decode-save
2293   "O" gnus-uu-decode-save
2294   "b" gnus-uu-decode-binhex
2295   "B" gnus-uu-decode-binhex
2296   "Y" gnus-uu-decode-yenc
2297   "p" gnus-uu-decode-postscript
2298   "P" gnus-uu-decode-postscript-and-save)
2299
2300 (gnus-define-keys
2301     (gnus-uu-extract-view-map "v" gnus-uu-extract-map)
2302   "u" gnus-uu-decode-uu-view
2303   "U" gnus-uu-decode-uu-and-save-view
2304   "s" gnus-uu-decode-unshar-view
2305   "S" gnus-uu-decode-unshar-and-save-view
2306   "o" gnus-uu-decode-save-view
2307   "O" gnus-uu-decode-save-view
2308   "b" gnus-uu-decode-binhex-view
2309   "B" gnus-uu-decode-binhex-view
2310   "p" gnus-uu-decode-postscript-view
2311   "P" gnus-uu-decode-postscript-and-save-view)
2312
2313 (defvar gnus-article-post-menu nil)
2314
2315 (defconst gnus-summary-menu-maxlen 20)
2316
2317 (defun gnus-summary-menu-split (menu)
2318   ;; If we have lots of elements, divide them into groups of 20
2319   ;; and make a pane (or submenu) for each one.
2320   (if (> (length menu) (/ (* gnus-summary-menu-maxlen 3) 2))
2321       (let ((menu menu) sublists next
2322             (i 1))
2323         (while menu
2324           ;; Pull off the next gnus-summary-menu-maxlen elements
2325           ;; and make them the next element of sublist.
2326           (setq next (nthcdr gnus-summary-menu-maxlen menu))
2327           (if next
2328               (setcdr (nthcdr (1- gnus-summary-menu-maxlen) menu)
2329                       nil))
2330           (setq sublists (cons (cons (format "%s ... %s" (aref (car menu) 0)
2331                                              (aref (car (last menu)) 0)) menu)
2332                                sublists))
2333           (setq i (1+ i))
2334           (setq menu next))
2335         (nreverse sublists))
2336     ;; Few elements--put them all in one pane.
2337     menu))
2338
2339 (defun gnus-summary-make-menu-bar ()
2340   (gnus-turn-off-edit-menu 'summary)
2341
2342   (unless (boundp 'gnus-summary-misc-menu)
2343
2344     (easy-menu-define
2345       gnus-summary-kill-menu gnus-summary-mode-map ""
2346       (cons
2347        "Score"
2348        (nconc
2349         (list
2350          ["Customize" gnus-score-customize t])
2351         (gnus-make-score-map 'increase)
2352         (gnus-make-score-map 'lower)
2353         '(("Mark"
2354            ["Kill below" gnus-summary-kill-below t]
2355            ["Mark above" gnus-summary-mark-above t]
2356            ["Tick above" gnus-summary-tick-above t]
2357            ["Clear above" gnus-summary-clear-above t])
2358           ["Current article score" gnus-summary-current-score t]
2359           ["Current thread score" (gnus-summary-current-score 'total) t]
2360           ["Set score" gnus-summary-set-score t]
2361           ["Switch current score file..." gnus-score-change-score-file t]
2362           ["Set mark below..." gnus-score-set-mark-below t]
2363           ["Set expunge below..." gnus-score-set-expunge-below t]
2364           ["Edit current score file" gnus-score-edit-current-scores t]
2365           ["Edit score file..." gnus-score-edit-file t]
2366           ["Trace score" gnus-score-find-trace t]
2367           ["Find words" gnus-score-find-favourite-words t]
2368           ["Rescore buffer" gnus-summary-rescore t]
2369           ["Increase score..." gnus-summary-increase-score t]
2370           ["Lower score..." gnus-summary-lower-score t]))))
2371
2372     ;; Define both the Article menu in the summary buffer and the
2373     ;; equivalent Commands menu in the article buffer here for
2374     ;; consistency.
2375     (let ((innards
2376            `(("Hide"
2377               ["All" gnus-article-hide t]
2378               ["Headers" gnus-article-hide-headers t]
2379               ["Signature" gnus-article-hide-signature t]
2380               ["Citation" gnus-article-hide-citation t]
2381               ["List identifiers" gnus-article-hide-list-identifiers t]
2382               ["Banner" gnus-article-strip-banner t]
2383               ["Boring headers" gnus-article-hide-boring-headers t])
2384              ("Highlight"
2385               ["All" gnus-article-highlight t]
2386               ["Headers" gnus-article-highlight-headers t]
2387               ["Signature" gnus-article-highlight-signature t]
2388               ["Citation" gnus-article-highlight-citation t])
2389              ("MIME"
2390               ["Words" gnus-article-decode-mime-words t]
2391               ["Charset" gnus-article-decode-charset t]
2392               ["QP" gnus-article-de-quoted-unreadable t]
2393               ["Base64" gnus-article-de-base64-unreadable t]
2394               ["View MIME buttons" gnus-summary-display-buttonized t]
2395               ["View MIME buttons in header"
2396                gnus-mime-buttonize-attachments-in-header t]
2397               ["View all" gnus-mime-view-all-parts t]
2398               ["Verify and Decrypt" gnus-summary-force-verify-and-decrypt t]
2399               ["Encrypt body" gnus-article-encrypt-body
2400                :active (not (gnus-group-read-only-p))
2401                ,@(if (featurep 'xemacs) nil
2402                    '(:help "Encrypt the message body on disk"))]
2403               ["Extract all parts..." gnus-summary-save-parts t]
2404               ("Multipart"
2405                ["Repair multipart" gnus-summary-repair-multipart t]
2406                ["Pipe part..." gnus-article-pipe-part t]
2407                ["Inline part" gnus-article-inline-part t]
2408                ["View part as type..." gnus-article-view-part-as-type t]
2409                ["Encrypt body" gnus-article-encrypt-body
2410                 :active (not (gnus-group-read-only-p))
2411                ,@(if (featurep 'xemacs) nil
2412                    '(:help "Encrypt the message body on disk"))]
2413                ["View part externally" gnus-article-view-part-externally t]
2414                ["View HTML parts in browser" gnus-article-browse-html-article t]
2415                ["View part with charset..." gnus-article-view-part-as-charset t]
2416                ["Copy part" gnus-article-copy-part t]
2417                ["Save part..." gnus-article-save-part t]
2418                ["View part" gnus-article-view-part t]))
2419              ("Date"
2420               ["Local" gnus-article-date-local t]
2421               ["ISO8601" gnus-article-date-iso8601 t]
2422               ["UT" gnus-article-date-ut t]
2423               ["Original" gnus-article-date-original t]
2424               ["Lapsed" gnus-article-date-lapsed t]
2425               ["User-defined" gnus-article-date-user t])
2426              ("Display"
2427               ["Display HTML images" gnus-article-show-images t]
2428               ["Remove images" gnus-article-remove-images t]
2429               ["Toggle smiley" gnus-treat-smiley t]
2430               ["Show X-Face" gnus-article-display-x-face t]
2431               ["Show picons in From" gnus-treat-from-picon t]
2432               ["Show picons in mail headers" gnus-treat-mail-picon t]
2433               ["Show picons in news headers" gnus-treat-newsgroups-picon t]
2434               ["Show Gravatars in From" gnus-treat-from-gravatar t]
2435               ["Show Gravatars in mail headers" gnus-treat-mail-gravatar t]
2436               ("View as different encoding"
2437                ,@(gnus-summary-menu-split
2438                   (mapcar
2439                    (lambda (cs)
2440                      ;; Since easymenu under Emacs doesn't allow
2441                      ;; lambda forms for menu commands, we should
2442                      ;; provide intern'ed function symbols.
2443                      (let ((command (intern (format "\
2444 gnus-summary-show-article-from-menu-as-charset-%s" cs))))
2445                        (fset command
2446                              `(lambda ()
2447                                 (interactive)
2448                                 (let ((gnus-summary-show-article-charset-alist
2449                                        '((1 . ,cs))))
2450                                   (gnus-summary-show-article 1))))
2451                        `[,(symbol-name cs) ,command t]))
2452                    (sort (if (fboundp 'coding-system-list)
2453                              (coding-system-list)
2454                            (mapcar 'car mm-mime-mule-charset-alist))
2455                          'string<)))))
2456              ("Washing"
2457               ("Remove Blanks"
2458                ["Leading" gnus-article-strip-leading-blank-lines t]
2459                ["Multiple" gnus-article-strip-multiple-blank-lines t]
2460                ["Trailing" gnus-article-remove-trailing-blank-lines t]
2461                ["All of the above" gnus-article-strip-blank-lines t]
2462                ["All" gnus-article-strip-all-blank-lines t]
2463                ["Leading space" gnus-article-strip-leading-space t]
2464                ["Trailing space" gnus-article-strip-trailing-space t]
2465                ["Leading space in headers"
2466                 gnus-article-remove-leading-whitespace t])
2467               ["Overstrike" gnus-article-treat-overstrike t]
2468               ["Dumb quotes" gnus-article-treat-dumbquotes t]
2469               ["Non-ASCII" gnus-article-treat-non-ascii t]
2470               ["Emphasis" gnus-article-emphasize t]
2471               ["Word wrap" gnus-article-fill-cited-article t]
2472               ["Fill long lines" gnus-article-fill-long-lines t]
2473               ["Toggle truncate long lines" gnus-article-toggle-truncate-lines t]
2474               ["Capitalize sentences" gnus-article-capitalize-sentences t]
2475               ["Remove CR" gnus-article-remove-cr t]
2476               ["Quoted-Printable" gnus-article-de-quoted-unreadable t]
2477               ["Base64" gnus-article-de-base64-unreadable t]
2478               ["Rot 13" gnus-summary-caesar-message
2479                ,@(if (featurep 'xemacs) '(t)
2480                    '(:help "\"Caesar rotate\" article by 13"))]
2481               ["De-IDNA" gnus-summary-idna-message t]
2482               ["Morse decode" gnus-summary-morse-message t]
2483               ["Unix pipe..." gnus-summary-pipe-message t]
2484               ["Add buttons" gnus-article-add-buttons t]
2485               ["Add buttons to head" gnus-article-add-buttons-to-head t]
2486               ["Stop page breaking" gnus-summary-stop-page-breaking t]
2487               ["Verbose header" gnus-summary-verbose-headers t]
2488               ["Toggle header" gnus-summary-toggle-header t]
2489               ["Unfold headers" gnus-article-treat-unfold-headers t]
2490               ["Fold newsgroups" gnus-article-treat-fold-newsgroups t]
2491               ["Html" gnus-article-wash-html t]
2492               ["Unsplit URLs" gnus-article-unsplit-urls t]
2493               ["Verify X-PGP-Sig" gnus-article-verify-x-pgp-sig t]
2494               ["Decode HZ" gnus-article-decode-HZ t]
2495               ["ANSI sequences" gnus-article-treat-ansi-sequences t]
2496               ("(Outlook) Deuglify"
2497                ["Unwrap lines" gnus-article-outlook-unwrap-lines t]
2498                ["Repair attribution" gnus-article-outlook-repair-attribution t]
2499                ["Rearrange citation" gnus-article-outlook-rearrange-citation t]
2500                ["Full (Outlook) deuglify"
2501                 gnus-article-outlook-deuglify-article t])
2502               )
2503              ("Output"
2504               ["Save in default format..." gnus-summary-save-article
2505                ,@(if (featurep 'xemacs) '(t)
2506                    '(:help "Save article using default method"))]
2507               ["Save in file..." gnus-summary-save-article-file
2508                ,@(if (featurep 'xemacs) '(t)
2509                    '(:help "Save article in file"))]
2510               ["Save in Unix mail format..." gnus-summary-save-article-mail t]
2511               ["Save in MH folder..." gnus-summary-save-article-folder t]
2512               ["Save in VM folder..." gnus-summary-save-article-vm t]
2513               ["Save in RMAIL mbox..." gnus-summary-save-article-rmail t]
2514               ["Save body in file..." gnus-summary-save-article-body-file t]
2515               ["Pipe through a filter..." gnus-summary-pipe-output t]
2516               ["Print with Muttprint..." gnus-summary-muttprint t]
2517               ["Print" gnus-summary-print-article
2518                ,@(if (featurep 'xemacs) '(t)
2519                    '(:help "Generate and print a PostScript image"))])
2520              ("Copy, move,... (Backend)"
2521               ,@(if (featurep 'xemacs) nil
2522                   '(:help "Copying, moving, expiring articles..."))
2523               ["Respool article..." gnus-summary-respool-article t]
2524               ["Move article..." gnus-summary-move-article
2525                (gnus-check-backend-function
2526                 'request-move-article gnus-newsgroup-name)]
2527               ["Copy article..." gnus-summary-copy-article t]
2528               ["Crosspost article..." gnus-summary-crosspost-article
2529                (gnus-check-backend-function
2530                 'request-replace-article gnus-newsgroup-name)]
2531               ["Import file..." gnus-summary-import-article
2532                (gnus-check-backend-function
2533                 'request-accept-article gnus-newsgroup-name)]
2534               ["Create article..." gnus-summary-create-article
2535                (gnus-check-backend-function
2536                 'request-accept-article gnus-newsgroup-name)]
2537               ["Check if posted" gnus-summary-article-posted-p t]
2538               ["Edit article" gnus-summary-edit-article
2539                (not (gnus-group-read-only-p))]
2540               ["Delete article" gnus-summary-delete-article
2541                (gnus-check-backend-function
2542                 'request-expire-articles gnus-newsgroup-name)]
2543               ["Query respool" gnus-summary-respool-query t]
2544               ["Trace respool" gnus-summary-respool-trace t]
2545               ["Delete expirable articles" gnus-summary-expire-articles-now
2546                (gnus-check-backend-function
2547                 'request-expire-articles gnus-newsgroup-name)])
2548              ("Extract"
2549               ["Uudecode" gnus-uu-decode-uu
2550                ,@(if (featurep 'xemacs) '(t)
2551                    '(:help "Decode uuencoded article(s)"))]
2552               ["Uudecode and save" gnus-uu-decode-uu-and-save t]
2553               ["Unshar" gnus-uu-decode-unshar t]
2554               ["Unshar and save" gnus-uu-decode-unshar-and-save t]
2555               ["Save" gnus-uu-decode-save t]
2556               ["Binhex" gnus-uu-decode-binhex t]
2557               ["PostScript" gnus-uu-decode-postscript t]
2558               ["All MIME parts" gnus-summary-save-parts t])
2559              ("Cache"
2560               ["Enter article" gnus-cache-enter-article t]
2561               ["Remove article" gnus-cache-remove-article t])
2562              ["Translate" gnus-article-babel t]
2563              ["Select article buffer" gnus-summary-select-article-buffer t]
2564              ["Make article buffer sticky" gnus-sticky-article t]
2565              ["Enter digest buffer" gnus-summary-enter-digest-group t]
2566              ["Isearch article..." gnus-summary-isearch-article t]
2567              ["Beginning of the article" gnus-summary-beginning-of-article t]
2568              ["End of the article" gnus-summary-end-of-article t]
2569              ["Fetch parent of article" gnus-summary-refer-parent-article t]
2570              ["Fetch referenced articles" gnus-summary-refer-references t]
2571              ["Fetch current thread" gnus-summary-refer-thread t]
2572              ["Fetch article with id..." gnus-summary-refer-article t]
2573              ["Setup Mailing List Params" gnus-mailing-list-insinuate t]
2574              ["Redisplay" gnus-summary-show-article t]
2575              ["Raw article" gnus-summary-show-raw-article :keys "C-u g"])))
2576       (easy-menu-define
2577         gnus-summary-article-menu gnus-summary-mode-map ""
2578         (cons "Article" innards))
2579
2580       (if (not (keymapp gnus-summary-article-menu))
2581           (easy-menu-define
2582             gnus-article-commands-menu gnus-article-mode-map ""
2583             (cons "Commands" innards))
2584         ;; in Emacs, don't share menu.
2585         (setq gnus-article-commands-menu
2586               (copy-keymap gnus-summary-article-menu))
2587         (define-key gnus-article-mode-map [menu-bar commands]
2588           (cons "Commands" gnus-article-commands-menu))))
2589
2590     (easy-menu-define
2591       gnus-summary-thread-menu gnus-summary-mode-map ""
2592       '("Threads"
2593         ["Find all messages in thread" gnus-summary-refer-thread t]
2594         ["Toggle threading" gnus-summary-toggle-threads t]
2595         ["Hide threads" gnus-summary-hide-all-threads t]
2596         ["Show threads" gnus-summary-show-all-threads t]
2597         ["Hide thread" gnus-summary-hide-thread t]
2598         ["Show thread" gnus-summary-show-thread t]
2599         ["Go to next thread" gnus-summary-next-thread t]
2600         ["Go to previous thread" gnus-summary-prev-thread t]
2601         ["Go down thread" gnus-summary-down-thread t]
2602         ["Go up thread" gnus-summary-up-thread t]
2603         ["Top of thread" gnus-summary-top-thread t]
2604         ["Mark thread as read" gnus-summary-kill-thread t]
2605         ["Mark thread as expired" gnus-summary-expire-thread t]
2606         ["Lower thread score" gnus-summary-lower-thread t]
2607         ["Raise thread score" gnus-summary-raise-thread t]
2608         ["Rethread current" gnus-summary-rethread-current t]))
2609
2610     (easy-menu-define
2611       gnus-summary-post-menu gnus-summary-mode-map ""
2612       `("Post"
2613         ["Send a message (mail or news)" gnus-summary-post-news
2614          ,@(if (featurep 'xemacs) '(t)
2615              '(:help "Compose a new message (mail or news)"))]
2616         ["Followup" gnus-summary-followup
2617          ,@(if (featurep 'xemacs) '(t)
2618              '(:help "Post followup to this article"))]
2619         ["Followup and yank" gnus-summary-followup-with-original
2620          ,@(if (featurep 'xemacs) '(t)
2621              '(:help "Post followup to this article, quoting its contents"))]
2622         ["Supersede article" gnus-summary-supersede-article t]
2623         ["Cancel article" gnus-summary-cancel-article
2624          ,@(if (featurep 'xemacs) '(t)
2625              '(:help "Cancel an article you posted"))]
2626         ["Reply" gnus-summary-reply t]
2627         ["Reply and yank" gnus-summary-reply-with-original t]
2628         ["Wide reply" gnus-summary-wide-reply t]
2629         ["Wide reply and yank" gnus-summary-wide-reply-with-original
2630          ,@(if (featurep 'xemacs) '(t)
2631              '(:help "Mail a reply, quoting this article"))]
2632         ["Very wide reply" gnus-summary-very-wide-reply t]
2633         ["Very wide reply and yank" gnus-summary-very-wide-reply-with-original
2634          ,@(if (featurep 'xemacs) '(t)
2635              '(:help "Mail a very wide reply, quoting this article"))]
2636         ["Mail forward" gnus-summary-mail-forward t]
2637         ["Post forward" gnus-summary-post-forward t]
2638         ["Digest and mail" gnus-uu-digest-mail-forward t]
2639         ["Digest and post" gnus-uu-digest-post-forward t]
2640         ["Resend message" gnus-summary-resend-message t]
2641         ["Resend message edit" gnus-summary-resend-message-edit t]
2642         ["Send bounced mail" gnus-summary-resend-bounced-mail t]
2643         ["Send a mail" gnus-summary-mail-other-window t]
2644         ["Create a local message" gnus-summary-news-other-window t]
2645         ["Uuencode and post" gnus-uu-post-news
2646          ,@(if (featurep 'xemacs) '(t)
2647              '(:help "Post a uuencoded article"))]
2648         ["Followup via news" gnus-summary-followup-to-mail t]
2649         ["Followup via news and yank"
2650          gnus-summary-followup-to-mail-with-original t]
2651         ["Strip signature on reply"
2652          (lambda ()
2653            (interactive)
2654            (if (not (memq message-cite-function
2655                           '(message-cite-original-without-signature
2656                             message-cite-original)))
2657                ;; Stupid workaround for XEmacs not honoring :visible.
2658                (message "Can't toggle this value of `message-cite-function'")
2659              (setq message-cite-function
2660                    (if (eq message-cite-function
2661                            'message-cite-original-without-signature)
2662                        'message-cite-original
2663                      'message-cite-original-without-signature))))
2664          ;; XEmacs barfs on :visible.
2665          ,@(if (featurep 'xemacs) nil
2666              '(:visible (memq message-cite-function
2667                               '(message-cite-original-without-signature
2668                                 message-cite-original))))
2669          :style toggle
2670          :selected (eq message-cite-function
2671                        'message-cite-original-without-signature)
2672          ,@(if (featurep 'xemacs) nil
2673              '(:help "Strip signature from cited article when replying."))]
2674         ;;("Draft"
2675         ;;["Send" gnus-summary-send-draft t]
2676         ;;["Send bounced" gnus-resend-bounced-mail t])
2677         ))
2678
2679     (cond
2680      ((not (keymapp gnus-summary-post-menu))
2681       (setq gnus-article-post-menu gnus-summary-post-menu))
2682      ((not gnus-article-post-menu)
2683       ;; Don't share post menu.
2684       (setq gnus-article-post-menu
2685             (copy-keymap gnus-summary-post-menu))))
2686     (define-key gnus-article-mode-map [menu-bar post]
2687       (cons "Post" gnus-article-post-menu))
2688
2689     (easy-menu-define
2690       gnus-summary-misc-menu gnus-summary-mode-map ""
2691       `("Gnus"
2692         ("Mark Read"
2693          ["Mark as read" gnus-summary-mark-as-read-forward t]
2694          ["Mark same subject and select"
2695           gnus-summary-kill-same-subject-and-select t]
2696          ["Mark same subject" gnus-summary-kill-same-subject t]
2697          ["Catchup" gnus-summary-catchup
2698           ,@(if (featurep 'xemacs) '(t)
2699               '(:help "Mark unread articles in this group as read"))]
2700          ["Catchup all" gnus-summary-catchup-all t]
2701          ["Catchup to here" gnus-summary-catchup-to-here t]
2702          ["Catchup from here" gnus-summary-catchup-from-here t]
2703          ["Catchup region" gnus-summary-mark-region-as-read
2704           (gnus-mark-active-p)]
2705          ["Mark excluded" gnus-summary-limit-mark-excluded-as-read t])
2706         ("Mark Various"
2707          ["Tick" gnus-summary-tick-article-forward t]
2708          ["Mark as dormant" gnus-summary-mark-as-dormant t]
2709          ["Remove marks" gnus-summary-clear-mark-forward t]
2710          ["Set expirable mark" gnus-summary-mark-as-expirable t]
2711          ["Set bookmark" gnus-summary-set-bookmark t]
2712          ["Remove bookmark" gnus-summary-remove-bookmark t])
2713         ("Limit to"
2714          ["Marks..." gnus-summary-limit-to-marks t]
2715          ["Subject..." gnus-summary-limit-to-subject t]
2716          ["Author..." gnus-summary-limit-to-author t]
2717          ["Recipient..." gnus-summary-limit-to-recipient t]
2718          ["Address..." gnus-summary-limit-to-address t]
2719          ["Age..." gnus-summary-limit-to-age t]
2720          ["Extra..." gnus-summary-limit-to-extra t]
2721          ["Score..." gnus-summary-limit-to-score t]
2722          ["Display Predicate" gnus-summary-limit-to-display-predicate t]
2723          ["Unread" gnus-summary-limit-to-unread t]
2724          ["Unseen" gnus-summary-limit-to-unseen t]
2725          ["Singletons" gnus-summary-limit-to-singletons t]
2726          ["Replied" gnus-summary-limit-to-replied t]
2727          ["Non-dormant" gnus-summary-limit-exclude-dormant t]
2728          ["Next or process marked articles" gnus-summary-limit-to-articles t]
2729          ["Pop limit" gnus-summary-pop-limit t]
2730          ["Show dormant" gnus-summary-limit-include-dormant t]
2731          ["Hide childless dormant"
2732           gnus-summary-limit-exclude-childless-dormant t]
2733          ;;["Hide thread" gnus-summary-limit-exclude-thread t]
2734          ["Hide marked" gnus-summary-limit-exclude-marks t]
2735          ["Show expunged" gnus-summary-limit-include-expunged t])
2736         ("Process Mark"
2737          ["Set mark" gnus-summary-mark-as-processable t]
2738          ["Remove mark" gnus-summary-unmark-as-processable t]
2739          ["Remove all marks" gnus-summary-unmark-all-processable t]
2740          ["Invert marks" gnus-uu-invert-processable t]
2741          ["Mark above" gnus-uu-mark-over t]
2742          ["Mark series" gnus-uu-mark-series t]
2743          ["Mark region" gnus-uu-mark-region (gnus-mark-active-p)]
2744          ["Unmark region" gnus-uu-unmark-region (gnus-mark-active-p)]
2745          ["Mark by regexp..." gnus-uu-mark-by-regexp t]
2746          ["Unmark by regexp..." gnus-uu-unmark-by-regexp t]
2747          ["Mark all" gnus-uu-mark-all t]
2748          ["Mark buffer" gnus-uu-mark-buffer t]
2749          ["Mark sparse" gnus-uu-mark-sparse t]
2750          ["Mark thread" gnus-uu-mark-thread t]
2751          ["Unmark thread" gnus-uu-unmark-thread t]
2752          ("Process Mark Sets"
2753           ["Kill" gnus-summary-kill-process-mark t]
2754           ["Yank" gnus-summary-yank-process-mark
2755            gnus-newsgroup-process-stack]
2756           ["Save" gnus-summary-save-process-mark t]
2757           ["Run command on marked..." gnus-summary-universal-argument t]))
2758         ("Registry Marks")
2759         ("Scroll article"
2760          ["Page forward" gnus-summary-next-page
2761           ,@(if (featurep 'xemacs) '(t)
2762               '(:help "Show next page of article"))]
2763          ["Page backward" gnus-summary-prev-page
2764           ,@(if (featurep 'xemacs) '(t)
2765               '(:help "Show previous page of article"))]
2766          ["Line forward" gnus-summary-scroll-up t])
2767         ("Move"
2768          ["Next unread article" gnus-summary-next-unread-article t]
2769          ["Previous unread article" gnus-summary-prev-unread-article t]
2770          ["Next article" gnus-summary-next-article t]
2771          ["Previous article" gnus-summary-prev-article t]
2772          ["Next unread subject" gnus-summary-next-unread-subject t]
2773          ["Previous unread subject" gnus-summary-prev-unread-subject t]
2774          ["Next article same subject" gnus-summary-next-same-subject t]
2775          ["Previous article same subject" gnus-summary-prev-same-subject t]
2776          ["First unread article" gnus-summary-first-unread-article t]
2777          ["Best unread article" gnus-summary-best-unread-article t]
2778          ["Go to subject number..." gnus-summary-goto-subject t]
2779          ["Go to article number..." gnus-summary-goto-article t]
2780          ["Go to the last article" gnus-summary-goto-last-article t]
2781          ["Pop article off history" gnus-summary-pop-article t])
2782         ("Sort"
2783          ["Sort by number" gnus-summary-sort-by-number t]
2784          ["Sort by most recent number" gnus-summary-sort-by-most-recent-number t]
2785          ["Sort by author" gnus-summary-sort-by-author t]
2786          ["Sort by recipient" gnus-summary-sort-by-recipient t]
2787          ["Sort by subject" gnus-summary-sort-by-subject t]
2788          ["Sort by date" gnus-summary-sort-by-date t]
2789          ["Sort by most recent date" gnus-summary-sort-by-most-recent-date t]
2790          ["Sort by score" gnus-summary-sort-by-score t]
2791          ["Sort by lines" gnus-summary-sort-by-lines t]
2792          ["Sort by characters" gnus-summary-sort-by-chars t]
2793          ["Randomize" gnus-summary-sort-by-random t]
2794          ["Original sort" gnus-summary-sort-by-original t])
2795         ("Help"
2796          ["Describe group" gnus-summary-describe-group t]
2797          ["Read manual" gnus-info-find-node t])
2798         ("Modes"
2799          ["Pick and read" gnus-pick-mode t]
2800          ["Binary" gnus-binary-mode t])
2801         ("Regeneration"
2802          ["Regenerate" gnus-summary-prepare t]
2803          ["Insert cached articles" gnus-summary-insert-cached-articles t]
2804          ["Insert dormant articles" gnus-summary-insert-dormant-articles t]
2805          ["Insert ticked articles" gnus-summary-insert-ticked-articles t]
2806          ["Toggle threading" gnus-summary-toggle-threads t])
2807         ["See old articles" gnus-summary-insert-old-articles t]
2808         ["See new articles" gnus-summary-insert-new-articles t]
2809         ["Filter articles..." gnus-summary-execute-command t]
2810         ["Run command on articles..." gnus-summary-universal-argument t]
2811         ["Search articles forward..." gnus-summary-search-article-forward t]
2812         ["Search articles backward..." gnus-summary-search-article-backward t]
2813         ["Toggle line truncation" gnus-summary-toggle-truncation t]
2814         ["Expand window" gnus-summary-expand-window t]
2815         ["Expire expirable articles" gnus-summary-expire-articles
2816          (gnus-check-backend-function
2817           'request-expire-articles gnus-newsgroup-name)]
2818         ["Edit local kill file" gnus-summary-edit-local-kill t]
2819         ["Edit main kill file" gnus-summary-edit-global-kill t]
2820         ["Edit group parameters" gnus-summary-edit-parameters t]
2821         ["Customize group parameters" gnus-summary-customize-parameters t]
2822         ["Send a bug report" gnus-bug t]
2823         ("Exit"
2824          ["Catchup and exit" gnus-summary-catchup-and-exit
2825           ,@(if (featurep 'xemacs) '(t)
2826               '(:help "Mark unread articles in this group as read, then exit"))]
2827          ["Catchup all and exit" gnus-summary-catchup-all-and-exit t]
2828          ["Catchup and goto next" gnus-summary-catchup-and-goto-next-group t]
2829          ["Catchup and goto prev" gnus-summary-catchup-and-goto-prev-group t]
2830          ["Exit group" gnus-summary-exit
2831           ,@(if (featurep 'xemacs) '(t)
2832               '(:help "Exit current group, return to group selection mode"))]
2833          ["Exit group without updating" gnus-summary-exit-no-update t]
2834          ["Exit and goto next group" gnus-summary-next-group t]
2835          ["Exit and goto prev group" gnus-summary-prev-group t]
2836          ["Reselect group" gnus-summary-reselect-current-group t]
2837          ["Rescan group" gnus-summary-rescan-group t]
2838          ["Update dribble" gnus-summary-save-newsrc t])))
2839
2840     (gnus-run-hooks 'gnus-summary-menu-hook)))
2841
2842 (defvar gnus-summary-tool-bar-map nil)
2843
2844 ;; Note: The :set function in the `gnus-summary-tool-bar*' variables will only
2845 ;; affect _new_ message buffers.  We might add a function that walks thru all
2846 ;; summary-mode buffers and force the update.
2847 (defun gnus-summary-tool-bar-update (&optional symbol value)
2848   "Update summary mode toolbar.
2849 Setter function for custom variables."
2850   (setq-default gnus-summary-tool-bar-map nil)
2851   (when symbol
2852     ;; When used as ":set" function:
2853     (set-default symbol value))
2854   (when (gnus-buffer-live-p gnus-summary-buffer)
2855     (with-current-buffer gnus-summary-buffer
2856       (gnus-summary-make-tool-bar))))
2857
2858 (defcustom gnus-summary-tool-bar (if (eq gmm-tool-bar-style 'gnome)
2859                                      'gnus-summary-tool-bar-gnome
2860                                    'gnus-summary-tool-bar-retro)
2861   "Specifies the Gnus summary tool bar.
2862
2863 It can be either a list or a symbol referring to a list.  See
2864 `gmm-tool-bar-from-list' for the format of the list.  The
2865 default key map is `gnus-summary-mode-map'.
2866
2867 Pre-defined symbols include `gnus-summary-tool-bar-gnome' and
2868 `gnus-summary-tool-bar-retro'."
2869   :type '(choice (const :tag "GNOME style" gnus-summary-tool-bar-gnome)
2870                  (const :tag "Retro look"  gnus-summary-tool-bar-retro)
2871                  (repeat :tag "User defined list" gmm-tool-bar-item)
2872                  (symbol))
2873   :version "23.1" ;; No Gnus
2874   :initialize 'custom-initialize-default
2875   :set 'gnus-summary-tool-bar-update
2876   :group 'gnus-summary)
2877
2878 (defcustom gnus-summary-tool-bar-gnome
2879   '((gnus-summary-post-news "mail/compose" nil)
2880     (gnus-summary-insert-new-articles "mail/inbox" nil
2881                                       :visible (or (not gnus-agent)
2882                                                    gnus-plugged))
2883     (gnus-summary-reply-with-original "mail/reply")
2884     (gnus-summary-reply "mail/reply" nil :visible nil)
2885     (gnus-summary-followup-with-original "mail/reply-all")
2886     (gnus-summary-followup "mail/reply-all" nil :visible nil)
2887     (gnus-summary-mail-forward "mail/forward")
2888     (gnus-summary-save-article "mail/save")
2889     (gnus-summary-search-article-forward "search" nil :visible nil)
2890     (gnus-summary-print-article "print")
2891     (gnus-summary-tick-article-forward "flag-followup" nil :visible nil)
2892     ;; Some new commands that may need more suitable icons:
2893     (gnus-summary-save-newsrc "save" nil :visible nil)
2894     ;; (gnus-summary-show-article "stock_message-display" nil :visible nil)
2895     (gnus-summary-prev-article "left-arrow")
2896     (gnus-summary-next-article "right-arrow")
2897     (gnus-summary-next-page "next-page")
2898     ;; (gnus-summary-enter-digest-group "right_arrow" nil :visible nil)
2899     ;;
2900     ;; Maybe some sort-by-... could be added:
2901     ;; (gnus-summary-sort-by-author "sort-a-z" nil :visible nil)
2902     ;; (gnus-summary-sort-by-date "sort-1-9" nil :visible nil)
2903     (gnus-summary-mark-as-expirable
2904      "delete" nil
2905      :visible (gnus-check-backend-function 'request-expire-articles
2906                                            gnus-newsgroup-name))
2907     (gnus-summary-mark-as-spam
2908      "mail/spam" t
2909      :visible (and (fboundp 'spam-group-ham-contents-p)
2910                    (spam-group-ham-contents-p gnus-newsgroup-name))
2911      :help "Mark as spam")
2912     (gnus-summary-mark-as-read-forward
2913      "mail/not-spam" nil
2914      :visible (and (fboundp 'spam-group-spam-contents-p)
2915                    (spam-group-spam-contents-p gnus-newsgroup-name)))
2916     ;;
2917     (gnus-summary-exit "exit")
2918     (gmm-customize-mode "preferences" t :help "Edit mode preferences")
2919     (gnus-info-find-node "help"))
2920   "List of functions for the summary tool bar (GNOME style).
2921
2922 See `gmm-tool-bar-from-list' for the format of the list."
2923   :type '(repeat gmm-tool-bar-item)
2924   :version "23.1" ;; No Gnus
2925   :initialize 'custom-initialize-default
2926   :set 'gnus-summary-tool-bar-update
2927   :group 'gnus-summary)
2928
2929 (defcustom gnus-summary-tool-bar-retro
2930   '((gnus-summary-prev-unread-article "gnus/prev-ur")
2931     (gnus-summary-next-unread-article "gnus/next-ur")
2932     (gnus-summary-post-news "gnus/post")
2933     (gnus-summary-followup-with-original "gnus/fuwo")
2934     (gnus-summary-followup "gnus/followup")
2935     (gnus-summary-reply-with-original "gnus/reply-wo")
2936     (gnus-summary-reply "gnus/reply")
2937     (gnus-summary-caesar-message "gnus/rot13")
2938     (gnus-uu-decode-uu "gnus/uu-decode")
2939     (gnus-summary-save-article-file "gnus/save-aif")
2940     (gnus-summary-save-article "gnus/save-art")
2941     (gnus-uu-post-news "gnus/uu-post")
2942     (gnus-summary-catchup "gnus/catchup")
2943     (gnus-summary-catchup-and-exit "gnus/cu-exit")
2944     (gnus-summary-exit "gnus/exit-summ")
2945     ;; Some new command that may need more suitable icons:
2946     (gnus-summary-print-article "gnus/print" nil :visible nil)
2947     (gnus-summary-mark-as-expirable "gnus/close" nil :visible nil)
2948     (gnus-summary-save-newsrc "gnus/save" nil :visible nil)
2949     ;; (gnus-summary-enter-digest-group "gnus/right_arrow" nil :visible nil)
2950     (gnus-summary-search-article-forward "gnus/search" nil :visible nil)
2951     ;; (gnus-summary-insert-new-articles "gnus/paste" nil :visible nil)
2952     ;; (gnus-summary-toggle-threads "gnus/open" nil :visible nil)
2953     ;;
2954     (gnus-info-find-node "gnus/help" nil :visible nil))
2955   "List of functions for the summary tool bar (retro look).
2956
2957 See `gmm-tool-bar-from-list' for the format of the list."
2958   :type '(repeat gmm-tool-bar-item)
2959   :version "23.1" ;; No Gnus
2960   :initialize 'custom-initialize-default
2961   :set 'gnus-summary-tool-bar-update
2962   :group 'gnus-summary)
2963
2964 (defcustom gnus-summary-tool-bar-zap-list t
2965   "List of icon items from the global tool bar.
2966 These items are not displayed in the Gnus summary mode tool bar.
2967
2968 See `gmm-tool-bar-from-list' for the format of the list."
2969   :type 'gmm-tool-bar-zap-list
2970   :version "23.1" ;; No Gnus
2971   :initialize 'custom-initialize-default
2972   :set 'gnus-summary-tool-bar-update
2973   :group 'gnus-summary)
2974
2975 (defvar image-load-path)
2976 (defvar tool-bar-map)
2977
2978 (defun gnus-summary-make-tool-bar (&optional force)
2979   "Make a summary mode tool bar from `gnus-summary-tool-bar'.
2980 When FORCE, rebuild the tool bar."
2981   (when (and (not (featurep 'xemacs))
2982              (boundp 'tool-bar-mode)
2983              tool-bar-mode
2984              (or (not gnus-summary-tool-bar-map) force))
2985     (let* ((load-path
2986             (gmm-image-load-path-for-library "gnus"
2987                                              "mail/save.xpm"
2988                                              nil t))
2989            (image-load-path (cons (car load-path)
2990                                   (when (boundp 'image-load-path)
2991                                     image-load-path)))
2992            (map (gmm-tool-bar-from-list gnus-summary-tool-bar
2993                                         gnus-summary-tool-bar-zap-list
2994                                         'gnus-summary-mode-map)))
2995       (when map
2996         ;; Need to set `gnus-summary-tool-bar-map' because `gnus-article-mode'
2997         ;; uses its value.
2998         (setq gnus-summary-tool-bar-map map))))
2999   (set (make-local-variable 'tool-bar-map) gnus-summary-tool-bar-map))
3000
3001 (defun gnus-make-score-map (type)
3002   "Make a summary score map of type TYPE."
3003   (if t
3004       nil
3005     (let ((headers '(("author" "from" string)
3006                      ("subject" "subject" string)
3007                      ("article body" "body" string)
3008                      ("article head" "head" string)
3009                      ("xref" "xref" string)
3010                      ("extra header" "extra" string)
3011                      ("lines" "lines" number)
3012                      ("followups to author" "followup" string)))
3013           (types '((number ("less than" <)
3014                            ("greater than" >)
3015                            ("equal" =))
3016                    (string ("substring" s)
3017                            ("exact string" e)
3018                            ("fuzzy string" f)
3019                            ("regexp" r))))
3020           (perms '(("temporary" (current-time-string))
3021                    ("permanent" nil)
3022                    ("immediate" now)))
3023           header)
3024       (list
3025        (apply
3026         'nconc
3027         (list
3028          (if (eq type 'lower)
3029              "Lower score"
3030            "Increase score"))
3031         (let (outh)
3032           (while headers
3033             (setq header (car headers))
3034             (setq outh
3035                   (cons
3036                    (apply
3037                     'nconc
3038                     (list (car header))
3039                     (let ((ts (cdr (assoc (nth 2 header) types)))
3040                           outt)
3041                       (while ts
3042                         (setq outt
3043                               (cons
3044                                (apply
3045                                 'nconc
3046                                 (list (caar ts))
3047                                 (let ((ps perms)
3048                                       outp)
3049                                   (while ps
3050                                     (setq outp
3051                                           (cons
3052                                            (vector
3053                                             (caar ps)
3054                                             (list
3055                                              'gnus-summary-score-entry
3056                                              (nth 1 header)
3057                                              (if (or (string= (nth 1 header)
3058                                                               "head")
3059                                                      (string= (nth 1 header)
3060                                                               "body"))
3061                                                  ""
3062                                                (list 'gnus-summary-header
3063                                                      (nth 1 header)))
3064                                              (list 'quote (nth 1 (car ts)))
3065                                              (list 'gnus-score-delta-default
3066                                                    nil)
3067                                              (nth 1 (car ps))
3068                                              t)
3069                                             t)
3070                                            outp))
3071                                     (setq ps (cdr ps)))
3072                                   (list (nreverse outp))))
3073                                outt))
3074                         (setq ts (cdr ts)))
3075                       (list (nreverse outt))))
3076                    outh))
3077             (setq headers (cdr headers)))
3078           (list (nreverse outh))))))))
3079
3080
3081 (declare-function turn-on-gnus-mailing-list-mode "gnus-ml" ())
3082 (defvar bookmark-make-record-function)
3083 \f
3084 (defvar bidi-paragraph-direction)
3085
3086 (defun gnus-summary-mode (&optional group)
3087   "Major mode for reading articles.
3088
3089 All normal editing commands are switched off.
3090 \\<gnus-summary-mode-map>
3091 Each line in this buffer represents one article.  To read an
3092 article, you can, for instance, type `\\[gnus-summary-next-page]'.  To move forwards
3093 and backwards while displaying articles, type `\\[gnus-summary-next-unread-article]' and `\\[gnus-summary-prev-unread-article]',
3094 respectively.
3095
3096 You can also post articles and send mail from this buffer.  To
3097 follow up an article, type `\\[gnus-summary-followup]'.  To mail a reply to the author
3098 of an article, type `\\[gnus-summary-reply]'.
3099
3100 There are approx. one gazillion commands you can execute in this
3101 buffer; read the info pages for more information (`\\[gnus-info-find-node]').
3102
3103 The following commands are available:
3104
3105 \\{gnus-summary-mode-map}"
3106   ;; FIXME: Use define-derived-mode.
3107   (interactive)
3108   (kill-all-local-variables)
3109   (let ((gnus-summary-local-variables gnus-newsgroup-variables))
3110     (gnus-summary-make-local-variables))
3111   (gnus-summary-make-local-variables)
3112   (setq gnus-newsgroup-name group)
3113   (when (gnus-visual-p 'summary-menu 'menu)
3114     (gnus-summary-make-menu-bar)
3115     (gnus-summary-make-tool-bar))
3116   (gnus-make-thread-indent-array)
3117   (gnus-simplify-mode-line)
3118   (setq major-mode 'gnus-summary-mode)
3119   (setq mode-name "Summary")
3120   (use-local-map gnus-summary-mode-map)
3121   (buffer-disable-undo)
3122   (setq buffer-read-only t              ;Disable modification
3123         show-trailing-whitespace nil)
3124   (setq truncate-lines t)
3125   ;; Force paragraph direction to be left-to-right.  Don't make it
3126   ;; bound globally in old Emacsen and XEmacsen.
3127   (set (make-local-variable 'bidi-paragraph-direction) 'left-to-right)
3128   (add-to-invisibility-spec '(gnus-sum . t))
3129   (gnus-summary-set-display-table)
3130   (gnus-set-default-directory)
3131   (make-local-variable 'gnus-summary-line-format)
3132   (make-local-variable 'gnus-summary-line-format-spec)
3133   (make-local-variable 'gnus-summary-dummy-line-format)
3134   (make-local-variable 'gnus-summary-dummy-line-format-spec)
3135   (make-local-variable 'gnus-summary-mark-positions)
3136   (gnus-make-local-hook 'pre-command-hook)
3137   (add-hook 'pre-command-hook 'gnus-set-global-variables nil t)
3138   (gnus-run-mode-hooks 'gnus-summary-mode-hook)
3139   (turn-on-gnus-mailing-list-mode)
3140   (mm-enable-multibyte)
3141   (set (make-local-variable 'bookmark-make-record-function)
3142        'gnus-summary-bookmark-make-record)
3143   (gnus-update-format-specifications nil 'summary 'summary-mode 'summary-dummy)
3144   (gnus-update-summary-mark-positions))
3145
3146 (defun gnus-summary-make-local-variables ()
3147   "Make all the local summary buffer variables."
3148   (let (global)
3149     (dolist (local gnus-summary-local-variables)
3150       (if (consp local)
3151           (progn
3152             (if (eq (cdr local) 'global)
3153                 ;; Copy the global value of the variable.
3154                 (setq global (symbol-value (car local)))
3155               ;; Use the value from the list.
3156               (setq global (eval (cdr local))))
3157             (set (make-local-variable (car local)) global))
3158         ;; Simple nil-valued local variable.
3159         (set (make-local-variable local) nil)))))
3160
3161 ;; Summary data functions.
3162
3163 (defmacro gnus-data-number (data)
3164   `(car ,data))
3165
3166 (defmacro gnus-data-set-number (data number)
3167   `(setcar ,data ,number))
3168
3169 (defmacro gnus-data-mark (data)
3170   `(nth 1 ,data))
3171
3172 (defmacro gnus-data-set-mark (data mark)
3173   `(setcar (nthcdr 1 ,data) ,mark))
3174
3175 (defmacro gnus-data-pos (data)
3176   `(nth 2 ,data))
3177
3178 (defmacro gnus-data-set-pos (data pos)
3179   `(setcar (nthcdr 2 ,data) ,pos))
3180
3181 (defmacro gnus-data-header (data)
3182   `(nth 3 ,data))
3183
3184 (defmacro gnus-data-set-header (data header)
3185   `(setf (nth 3 ,data) ,header))
3186
3187 (defmacro gnus-data-level (data)
3188   `(nth 4 ,data))
3189
3190 (defmacro gnus-data-unread-p (data)
3191   `(= (nth 1 ,data) gnus-unread-mark))
3192
3193 (defmacro gnus-data-read-p (data)
3194   `(/= (nth 1 ,data) gnus-unread-mark))
3195
3196 (defmacro gnus-data-pseudo-p (data)
3197   `(consp (nth 3 ,data)))
3198
3199 (defmacro gnus-data-find (number)
3200   `(assq ,number gnus-newsgroup-data))
3201
3202 (defmacro gnus-data-find-list (number &optional data)
3203   `(let ((bdata ,(or data 'gnus-newsgroup-data)))
3204      (memq (assq ,number bdata)
3205            bdata)))
3206
3207 (defmacro gnus-data-make (number mark pos header level)
3208   `(list ,number ,mark ,pos ,header ,level))
3209
3210 (defun gnus-data-enter (after-article number mark pos header level offset)
3211   (let ((data (gnus-data-find-list after-article)))
3212     (unless data
3213       (error "No such article: %d" after-article))
3214     (setcdr data (cons (gnus-data-make number mark pos header level)
3215                        (cdr data)))
3216     (setq gnus-newsgroup-data-reverse nil)
3217     (gnus-data-update-list (cddr data) offset)))
3218
3219 (defun gnus-data-enter-list (after-article list &optional offset)
3220   (when list
3221     (let ((data (and after-article (gnus-data-find-list after-article)))
3222           (ilist list))
3223       (if (not (or data
3224                    after-article))
3225           (let ((odata gnus-newsgroup-data))
3226             (setq gnus-newsgroup-data (nconc list gnus-newsgroup-data))
3227             (when offset
3228               (gnus-data-update-list odata offset)))
3229         ;; Find the last element in the list to be spliced into the main
3230         ;; list.
3231         (setq list (last list))
3232         (if (not data)
3233             (progn
3234               (setcdr list gnus-newsgroup-data)
3235               (setq gnus-newsgroup-data ilist)
3236               (when offset
3237                 (gnus-data-update-list (cdr list) offset)))
3238           (setcdr list (cdr data))
3239           (setcdr data ilist)
3240           (when offset
3241             (gnus-data-update-list (cdr list) offset))))
3242       (setq gnus-newsgroup-data-reverse nil))))
3243
3244 (defun gnus-data-remove (article &optional offset)
3245   (let ((data gnus-newsgroup-data))
3246     (if (= (gnus-data-number (car data)) article)
3247         (progn
3248           (setq gnus-newsgroup-data (cdr gnus-newsgroup-data)
3249                 gnus-newsgroup-data-reverse nil)
3250           (when offset
3251             (gnus-data-update-list gnus-newsgroup-data offset)))
3252       (while (cdr data)
3253         (when (= (gnus-data-number (cadr data)) article)
3254           (setcdr data (cddr data))
3255           (when offset
3256             (gnus-data-update-list (cdr data) offset))
3257           (setq data nil
3258                 gnus-newsgroup-data-reverse nil))
3259         (setq data (cdr data))))))
3260
3261 (defmacro gnus-data-list (backward)
3262   `(if ,backward
3263        (or gnus-newsgroup-data-reverse
3264            (setq gnus-newsgroup-data-reverse
3265                  (reverse gnus-newsgroup-data)))
3266      gnus-newsgroup-data))
3267
3268 (defun gnus-data-update-list (data offset)
3269   "Add OFFSET to the POS of all data entries in DATA."
3270   (setq gnus-newsgroup-data-reverse nil)
3271   (while data
3272     (setcar (nthcdr 2 (car data)) (+ offset (nth 2 (car data))))
3273     (setq data (cdr data))))
3274
3275 (defun gnus-summary-article-pseudo-p (article)
3276   "Say whether this article is a pseudo article or not."
3277   (not (vectorp (gnus-data-header (gnus-data-find article)))))
3278
3279 (defmacro gnus-summary-article-sparse-p (article)
3280   "Say whether this article is a sparse article or not."
3281   `(memq ,article gnus-newsgroup-sparse))
3282
3283 (defmacro gnus-summary-article-ancient-p (article)
3284   "Say whether this article is a sparse article or not."
3285   `(memq ,article gnus-newsgroup-ancient))
3286
3287 (defun gnus-article-children (number)
3288   "Return a list of all children to NUMBER."
3289   (let* ((data (gnus-data-find-list number))
3290          (level (gnus-data-level (car data)))
3291          children)
3292     (setq data (cdr data))
3293     (while (and data
3294                 (= (gnus-data-level (car data)) (1+ level)))
3295       (push (gnus-data-number (car data)) children)
3296       (setq data (cdr data)))
3297     children))
3298
3299 (defmacro gnus-summary-skip-intangible ()
3300   "If the current article is intangible, then jump to a different article."
3301   '(let ((to (get-text-property (point) 'gnus-intangible)))
3302      (and to (gnus-summary-goto-subject to))))
3303
3304 (defmacro gnus-summary-article-intangible-p ()
3305   "Say whether this article is intangible or not."
3306   '(get-text-property (point) 'gnus-intangible))
3307
3308 ;; Some summary mode macros.
3309
3310 (defmacro gnus-summary-article-number ()
3311   "The article number of the article on the current line.
3312 If there isn't an article number here, then we return the current
3313 article number."
3314   '(progn
3315      (gnus-summary-skip-intangible)
3316      (or (get-text-property (point) 'gnus-number)
3317          (gnus-summary-last-subject))))
3318
3319 (defmacro gnus-summary-article-header (&optional number)
3320   "Return the header of article NUMBER."
3321   `(gnus-data-header (gnus-data-find
3322                       ,(or number '(gnus-summary-article-number)))))
3323
3324 (defmacro gnus-summary-thread-level (&optional number)
3325   "Return the level of thread that starts with article NUMBER."
3326   `(if (and (eq gnus-summary-make-false-root 'dummy)
3327             (get-text-property (point) 'gnus-intangible))
3328        0
3329      (gnus-data-level (gnus-data-find
3330                        ,(or number '(gnus-summary-article-number))))))
3331
3332 (defmacro gnus-summary-article-mark (&optional number)
3333   "Return the mark of article NUMBER."
3334   `(gnus-data-mark (gnus-data-find
3335                     ,(or number '(gnus-summary-article-number)))))
3336
3337 (defmacro gnus-summary-article-pos (&optional number)
3338   "Return the position of the line of article NUMBER."
3339   `(gnus-data-pos (gnus-data-find
3340                    ,(or number '(gnus-summary-article-number)))))
3341
3342 (defalias 'gnus-summary-subject-string 'gnus-summary-article-subject)
3343 (defmacro gnus-summary-article-subject (&optional number)
3344   "Return current subject string or nil if nothing."
3345   `(let ((headers
3346           ,(if number
3347                `(gnus-data-header (assq ,number gnus-newsgroup-data))
3348              '(gnus-data-header (assq (gnus-summary-article-number)
3349                                       gnus-newsgroup-data)))))
3350      (and headers
3351           (vectorp headers)
3352           (mail-header-subject headers))))
3353
3354 (defmacro gnus-summary-article-score (&optional number)
3355   "Return current article score."
3356   `(or (cdr (assq ,(or number '(gnus-summary-article-number))
3357                   gnus-newsgroup-scored))
3358        gnus-summary-default-score 0))
3359
3360 (defun gnus-summary-article-children (&optional number)
3361   "Return a list of article numbers that are children of article NUMBER."
3362   (let* ((data (gnus-data-find-list (or number (gnus-summary-article-number))))
3363          (level (gnus-data-level (car data)))
3364          l children)
3365     (while (and (setq data (cdr data))
3366                 (> (setq l (gnus-data-level (car data))) level))
3367       (and (= (1+ level) l)
3368            (push (gnus-data-number (car data))
3369                  children)))
3370     (nreverse children)))
3371
3372 (defun gnus-summary-article-parent (&optional number)
3373   "Return the article number of the parent of article NUMBER."
3374   (let* ((data (gnus-data-find-list (or number (gnus-summary-article-number))
3375                                     (gnus-data-list t)))
3376          (level (gnus-data-level (car data))))
3377     (if (zerop level)
3378         ()                              ; This is a root.
3379       ;; We search until we find an article with a level less than
3380       ;; this one.  That function has to be the parent.
3381       (while (and (setq data (cdr data))
3382                   (not (< (gnus-data-level (car data)) level))))
3383       (and data (gnus-data-number (car data))))))
3384
3385 (defun gnus-unread-mark-p (mark)
3386   "Say whether MARK is the unread mark."
3387   (= mark gnus-unread-mark))
3388
3389 (defun gnus-read-mark-p (mark)
3390   "Say whether MARK is one of the marks that mark as read.
3391 This is all marks except unread, ticked, dormant, and expirable."
3392   (not (or (= mark gnus-unread-mark)
3393            (= mark gnus-ticked-mark)
3394            (= mark gnus-spam-mark)
3395            (= mark gnus-dormant-mark)
3396            (= mark gnus-expirable-mark))))
3397
3398 (defmacro gnus-article-mark (number)
3399   "Return the MARK of article NUMBER.
3400 This macro should only be used when computing the mark the \"first\"
3401 time; i.e., when generating the summary lines.  After that,
3402 `gnus-summary-article-mark' should be used to examine the
3403 marks of articles."
3404   `(cond
3405     ((memq ,number gnus-newsgroup-unsendable) gnus-unsendable-mark)
3406     ((memq ,number gnus-newsgroup-downloadable) gnus-downloadable-mark)
3407     ((memq ,number gnus-newsgroup-unreads) gnus-unread-mark)
3408     ((memq ,number gnus-newsgroup-marked) gnus-ticked-mark)
3409     ((memq ,number gnus-newsgroup-spam-marked) gnus-spam-mark)
3410     ((memq ,number gnus-newsgroup-dormant) gnus-dormant-mark)
3411     ((memq ,number gnus-newsgroup-expirable) gnus-expirable-mark)
3412     (t (or (cdr (assq ,number gnus-newsgroup-reads))
3413            gnus-ancient-mark))))
3414
3415 ;; Saving hidden threads.
3416
3417 (defmacro gnus-save-hidden-threads (&rest forms)
3418   "Save hidden threads, eval FORMS, and restore the hidden threads."
3419   (let ((config (make-symbol "config")))
3420     `(let ((,config (gnus-hidden-threads-configuration)))
3421        (unwind-protect
3422            (save-excursion
3423              ,@forms)
3424          (gnus-restore-hidden-threads-configuration ,config)))))
3425 (put 'gnus-save-hidden-threads 'lisp-indent-function 0)
3426 (put 'gnus-save-hidden-threads 'edebug-form-spec '(body))
3427
3428 (defun gnus-data-compute-positions ()
3429   "Compute the positions of all articles."
3430   (setq gnus-newsgroup-data-reverse nil)
3431   (let ((data gnus-newsgroup-data))
3432     (save-excursion
3433       (gnus-save-hidden-threads
3434         (gnus-summary-show-all-threads)
3435         (goto-char (point-min))
3436         (while data
3437           (while (get-text-property (point) 'gnus-intangible)
3438             (forward-line 1))
3439           (gnus-data-set-pos (car data) (+ (point) 3))
3440           (setq data (cdr data))
3441           (forward-line 1))))))
3442
3443 (defun gnus-hidden-threads-configuration ()
3444   "Return the current hidden threads configuration."
3445   (save-excursion
3446     (let (config)
3447       (goto-char (point-min))
3448       (while (not (eobp))
3449         (when (eq (get-char-property (point-at-eol) 'invisible) 'gnus-sum)
3450           (push (save-excursion (forward-line 0) (point)) config))
3451         (forward-line 1))
3452       config)))
3453
3454 (defun gnus-restore-hidden-threads-configuration (config)
3455   "Restore hidden threads configuration from CONFIG."
3456   (save-excursion
3457     (let (point (inhibit-read-only t))
3458       (while (setq point (pop config))
3459         (goto-char point)
3460         (gnus-summary-hide-thread)))))
3461
3462 ;; Various summary mode internalish functions.
3463
3464 (defun gnus-mouse-pick-article (e)
3465   (interactive "e")
3466   (mouse-set-point e)
3467   (gnus-summary-next-page nil t))
3468
3469 (defun gnus-summary-set-display-table ()
3470   "Change the display table.
3471 Odd characters have a tendency to mess
3472 up nicely formatted displays - we make all possible glyphs
3473 display only a single character."
3474
3475   ;; We start from the standard display table, if any.
3476   (let ((table (or (copy-sequence standard-display-table)
3477                    (make-display-table)))
3478         (i 32))
3479     ;; Nix out all the control chars...
3480     (while (>= (setq i (1- i)) 0)
3481       (gnus-put-display-table i [??] table))
3482    ;; ... but not newline and cr, of course.  (cr is necessary for the
3483     ;; selective display).
3484     (gnus-put-display-table ?\n nil table)
3485     (gnus-put-display-table ?\r nil table)
3486     ;; We keep TAB as well.
3487     (gnus-put-display-table ?\t nil table)
3488     ;; We nix out any glyphs 127 through 255, or 127 through 159 in
3489     ;; Emacs 23 (unicode), that are not set already.
3490     (let ((i (if (ignore-errors (= (make-char 'latin-iso8859-1 160) 160))
3491                  160
3492                256)))
3493       (while (>= (setq i (1- i)) 127)
3494         ;; Only modify if the entry is nil.
3495         (unless (gnus-get-display-table i table)
3496           (gnus-put-display-table i [??] table))))
3497     (setq buffer-display-table table)))
3498
3499 (defun gnus-summary-set-article-display-arrow (pos)
3500   "Update the overlay arrow to point to line at position POS."
3501   (when gnus-summary-display-arrow
3502     (make-local-variable 'overlay-arrow-position)
3503     (make-local-variable 'overlay-arrow-string)
3504     (save-excursion
3505       (goto-char pos)
3506       (beginning-of-line)
3507       (unless overlay-arrow-position
3508         (setq overlay-arrow-position (make-marker)))
3509       (setq overlay-arrow-string "=>"
3510             overlay-arrow-position (set-marker overlay-arrow-position
3511                                                (point)
3512                                                (current-buffer))))))
3513
3514 (defun gnus-summary-setup-buffer (group)
3515   "Initialize summary buffer.
3516 If the setup was successful, non-nil is returned."
3517   (let ((buffer (gnus-summary-buffer-name group))
3518         (dead-name (concat "*Dead Summary "
3519                            (gnus-group-decoded-name group) "*")))
3520     ;; If a dead summary buffer exists, we kill it.
3521     (when (gnus-buffer-live-p dead-name)
3522       (gnus-kill-buffer dead-name))
3523     (if (get-buffer buffer)
3524         (progn
3525           (set-buffer buffer)
3526           (setq gnus-summary-buffer (current-buffer))
3527           (not gnus-newsgroup-prepared))
3528       (set-buffer (gnus-get-buffer-create buffer))
3529       (setq gnus-summary-buffer (current-buffer))
3530       (gnus-summary-mode group)
3531       (when (gnus-group-quit-config group)
3532         (set (make-local-variable 'gnus-single-article-buffer) nil))
3533       (make-local-variable 'gnus-article-buffer)
3534       (make-local-variable 'gnus-article-current)
3535       (make-local-variable 'gnus-original-article-buffer)
3536       (setq gnus-newsgroup-name group)
3537       ;; Set any local variables in the group parameters.
3538       (gnus-summary-set-local-parameters gnus-newsgroup-name)
3539       t)))
3540
3541 (defun gnus-set-global-variables ()
3542   "Set the global equivalents of the buffer-local variables.
3543 They are set to the latest values they had.  These reflect the summary
3544 buffer that was in action when the last article was fetched."
3545   (when (derived-mode-p 'gnus-summary-mode)
3546     (setq gnus-summary-buffer (current-buffer))
3547     (let ((name gnus-newsgroup-name)
3548           (marked gnus-newsgroup-marked)
3549           (spam gnus-newsgroup-spam-marked)
3550           (unread gnus-newsgroup-unreads)
3551           (headers gnus-current-headers)
3552           (data gnus-newsgroup-data)
3553           (summary gnus-summary-buffer)
3554           (article-buffer gnus-article-buffer)
3555           (original gnus-original-article-buffer)
3556           (gac gnus-article-current)
3557           (reffed gnus-reffed-article-number)
3558           (score-file gnus-current-score-file)
3559           (default-charset gnus-newsgroup-charset)
3560           vlist)
3561       (let ((locals gnus-newsgroup-variables))
3562         (while locals
3563           (if (consp (car locals))
3564               (push (eval (caar locals)) vlist)
3565             (push (eval (car locals)) vlist))
3566           (setq locals (cdr locals)))
3567         (setq vlist (nreverse vlist)))
3568       (with-temp-buffer
3569         (setq gnus-newsgroup-name name
3570               gnus-newsgroup-marked marked
3571               gnus-newsgroup-spam-marked spam
3572               gnus-newsgroup-unreads unread
3573               gnus-current-headers headers
3574               gnus-newsgroup-data data
3575               gnus-article-current gac
3576               gnus-summary-buffer summary
3577               gnus-article-buffer article-buffer
3578               gnus-original-article-buffer original
3579               gnus-reffed-article-number reffed
3580               gnus-current-score-file score-file
3581               gnus-newsgroup-charset default-charset)
3582         (let ((locals gnus-newsgroup-variables))
3583           (while locals
3584             (if (consp (car locals))
3585                 (set (caar locals) (pop vlist))
3586               (set (car locals) (pop vlist)))
3587             (setq locals (cdr locals))))))))
3588
3589 (defun gnus-summary-article-unread-p (article)
3590   "Say whether ARTICLE is unread or not."
3591   (memq article gnus-newsgroup-unreads))
3592
3593 (defun gnus-summary-first-article-p (&optional article)
3594   "Return whether ARTICLE is the first article in the buffer."
3595   (if (not (setq article (or article (gnus-summary-article-number))))
3596       nil
3597     (eq article (caar gnus-newsgroup-data))))
3598
3599 (defun gnus-summary-last-article-p (&optional article)
3600   "Return whether ARTICLE is the last article in the buffer."
3601   (if (not (setq article (or article (gnus-summary-article-number))))
3602       ;; All non-existent numbers are the last article.  :-)
3603       t
3604     (not (cdr (gnus-data-find-list article)))))
3605
3606 (defun gnus-make-thread-indent-array (&optional n)
3607   (when (or n
3608             (progn (setq n 200) nil)
3609             (null gnus-thread-indent-array)
3610             (/= gnus-thread-indent-level gnus-thread-indent-array-level))
3611     (setq gnus-thread-indent-array (make-vector (1+ n) "")
3612           gnus-thread-indent-array-level gnus-thread-indent-level)
3613     (while (>= n 0)
3614       (aset gnus-thread-indent-array n
3615             (make-string (* n gnus-thread-indent-level) ? ))
3616       (setq n (1- n)))))
3617
3618 (defun gnus-update-summary-mark-positions ()
3619   "Compute where the summary marks are to go."
3620   (save-excursion
3621     (when (gnus-buffer-exists-p gnus-summary-buffer)
3622       (set-buffer gnus-summary-buffer))
3623     (let ((spec gnus-summary-line-format-spec)
3624           pos)
3625       (save-excursion
3626         (gnus-set-work-buffer)
3627         (let ((gnus-tmp-unread ?Z)
3628               (gnus-replied-mark ?Z)
3629               (gnus-score-below-mark ?Z)
3630               (gnus-score-over-mark ?Z)
3631               (gnus-undownloaded-mark ?Z)
3632               (gnus-summary-line-format-spec spec)
3633               (gnus-newsgroup-downloadable '(0))
3634               (header [0 "" "" "05 Apr 2001 23:33:09 +0400" "" "" 0 0 "" nil])
3635               case-fold-search ignores)
3636           ;; Here, all marks are bound to Z.
3637           (gnus-summary-insert-line header
3638                                     0 nil t gnus-tmp-unread t nil "" nil 1)
3639           (goto-char (point-min))
3640           ;; Memorize the positions of the same characters as dummy marks.
3641           (while (re-search-forward "[A-D]" nil t)
3642             (push (point) ignores))
3643           (erase-buffer)
3644           ;; We use A-D as dummy marks in order to know column positions
3645           ;; where marks should be inserted.
3646           (setq gnus-tmp-unread ?A
3647                 gnus-replied-mark ?B
3648                 gnus-score-below-mark ?C
3649                 gnus-score-over-mark ?C
3650                 gnus-undownloaded-mark ?D)
3651           (gnus-summary-insert-line header
3652                                     0 nil t gnus-tmp-unread t nil "" nil 1)
3653           ;; Ignore characters which aren't dummy marks.
3654           (dolist (p ignores)
3655             (delete-region (goto-char (1- p)) p)
3656             (insert ?Z))
3657           (goto-char (point-min))
3658           (setq pos (list (cons 'unread
3659                                 (and (search-forward "A" nil t)
3660                                      (- (point) (point-min) 1)))))
3661           (goto-char (point-min))
3662           (push (cons 'replied (and (search-forward "B" nil t)
3663                                     (- (point) (point-min) 1)))
3664                 pos)
3665           (goto-char (point-min))
3666           (push (cons 'score (and (search-forward "C" nil t)
3667                                   (- (point) (point-min) 1)))
3668                 pos)
3669           (goto-char (point-min))
3670           (push (cons 'download (and (search-forward "D" nil t)
3671                                      (- (point) (point-min) 1)))
3672                 pos)))
3673       (setq gnus-summary-mark-positions pos))))
3674
3675 (defun gnus-summary-insert-dummy-line (gnus-tmp-subject gnus-tmp-number)
3676   "Insert a dummy root in the summary buffer."
3677   (beginning-of-line)
3678   (gnus-add-text-properties
3679    (point) (progn (eval gnus-summary-dummy-line-format-spec) (point))
3680    (list 'gnus-number gnus-tmp-number 'gnus-intangible gnus-tmp-number)))
3681
3682 (defun gnus-summary-extract-address-component (from)
3683   (or (car (funcall gnus-extract-address-components from))
3684       from))
3685
3686 (defun gnus-summary-from-or-to-or-newsgroups (header gnus-tmp-from)
3687   (let ((mail-parse-charset gnus-newsgroup-charset)
3688         (ignored-from-addresses (gnus-ignored-from-addresses))
3689         ;; Is it really necessary to do this next part for each summary line?
3690         ;; Luckily, doesn't seem to slow things down much.
3691         (mail-parse-ignored-charsets
3692          (with-current-buffer gnus-summary-buffer
3693            gnus-newsgroup-ignored-charsets)))
3694     (or
3695      (and ignored-from-addresses
3696           (string-match ignored-from-addresses gnus-tmp-from)
3697           (let ((extra-headers (mail-header-extra header))
3698                 to
3699                 newsgroups)
3700             (cond
3701              ((setq to (cdr (assq 'To extra-headers)))
3702               (concat gnus-summary-to-prefix
3703                       (inline
3704                         (gnus-summary-extract-address-component
3705                          (funcall gnus-decode-encoded-address-function to)))))
3706              ((setq newsgroups
3707                     (or
3708                      (cdr (assq 'Newsgroups extra-headers))
3709                      (and
3710                       (memq 'Newsgroups gnus-extra-headers)
3711                       (eq (car (gnus-find-method-for-group
3712                                 gnus-newsgroup-name)) 'nntp)
3713                       (gnus-group-real-name gnus-newsgroup-name))))
3714               (concat gnus-summary-newsgroup-prefix newsgroups)))))
3715      (gnus-string-mark-left-to-right
3716       (inline
3717         (gnus-summary-extract-address-component gnus-tmp-from))))))
3718
3719 (defun gnus-summary-insert-line (gnus-tmp-header
3720                                  gnus-tmp-level gnus-tmp-current
3721                                  undownloaded gnus-tmp-unread gnus-tmp-replied
3722                                  gnus-tmp-expirable gnus-tmp-subject-or-nil
3723                                  &optional gnus-tmp-dummy gnus-tmp-score
3724                                  gnus-tmp-process)
3725   (if (>= gnus-tmp-level (length gnus-thread-indent-array))
3726       (gnus-make-thread-indent-array (max (* 2 (length gnus-thread-indent-array))
3727                                           gnus-tmp-level)))
3728   (let* ((gnus-tmp-indentation (aref gnus-thread-indent-array gnus-tmp-level))
3729          (gnus-tmp-lines (mail-header-lines gnus-tmp-header))
3730          (gnus-tmp-score (or gnus-tmp-score gnus-summary-default-score 0))
3731          (gnus-tmp-score-char
3732           (if (or (null gnus-summary-default-score)
3733                   (<= (abs (- gnus-tmp-score gnus-summary-default-score))
3734                       gnus-summary-zcore-fuzz))
3735               ?                         ;Whitespace
3736             (if (< gnus-tmp-score gnus-summary-default-score)
3737                 gnus-score-below-mark gnus-score-over-mark)))
3738          (gnus-tmp-number (mail-header-number gnus-tmp-header))
3739          (gnus-tmp-replied
3740           (cond (gnus-tmp-process gnus-process-mark)
3741                 ((memq gnus-tmp-current gnus-newsgroup-cached)
3742                  gnus-cached-mark)
3743                 (gnus-tmp-replied gnus-replied-mark)
3744                 ((memq gnus-tmp-current gnus-newsgroup-forwarded)
3745                  gnus-forwarded-mark)
3746                 ((memq gnus-tmp-current gnus-newsgroup-saved)
3747                  gnus-saved-mark)
3748                 ((memq gnus-tmp-number gnus-newsgroup-unseen)
3749                  gnus-unseen-mark)
3750                 (t gnus-no-mark)))
3751          (gnus-tmp-downloaded
3752           (cond (undownloaded
3753                  gnus-undownloaded-mark)
3754                 (gnus-newsgroup-agentized
3755                  gnus-downloaded-mark)
3756                 (t
3757                  gnus-no-mark)))
3758          (gnus-tmp-from (mail-header-from gnus-tmp-header))
3759          (gnus-tmp-name
3760           (cond
3761            ((string-match "<[^>]+> *$" gnus-tmp-from)
3762             (let ((beg (match-beginning 0)))
3763               (or (and (string-match "^\".+\"" gnus-tmp-from)
3764                        (substring gnus-tmp-from 1 (1- (match-end 0))))
3765                   (substring gnus-tmp-from 0 beg))))
3766            ((string-match "(.+)" gnus-tmp-from)
3767             (substring gnus-tmp-from
3768                        (1+ (match-beginning 0)) (1- (match-end 0))))
3769            (t gnus-tmp-from)))
3770          (gnus-tmp-subject (mail-header-subject gnus-tmp-header))
3771          (gnus-tmp-opening-bracket (if gnus-tmp-dummy ?\< ?\[))
3772          (gnus-tmp-closing-bracket (if gnus-tmp-dummy ?\> ?\]))
3773          (inhibit-read-only t))
3774     (when (string= gnus-tmp-name "")
3775       (setq gnus-tmp-name gnus-tmp-from))
3776     (unless (numberp gnus-tmp-lines)
3777       (setq gnus-tmp-lines -1))
3778     (if (= gnus-tmp-lines -1)
3779         (setq gnus-tmp-lines "?")
3780       (setq gnus-tmp-lines (number-to-string gnus-tmp-lines)))
3781     (condition-case ()
3782         (gnus-put-text-property
3783          (point)
3784          (progn (eval gnus-summary-line-format-spec) (point))
3785          'gnus-number gnus-tmp-number)
3786       (error (gnus-message 5 "Error updating the summary line")))
3787     (when (gnus-visual-p 'summary-highlight 'highlight)
3788       (forward-line -1)
3789       (gnus-summary-highlight-line)
3790       (gnus-run-hooks 'gnus-summary-update-hook)
3791       (forward-line 1))))
3792
3793 (defun gnus-summary-update-line (&optional dont-update)
3794   "Update summary line after change."
3795   (when (and gnus-summary-default-score
3796              (not gnus-summary-inhibit-highlight))
3797     (let* ((gnus-summary-inhibit-highlight t) ; Prevent recursion.
3798            (article (gnus-summary-article-number))
3799            (score (gnus-summary-article-score article)))
3800       (unless dont-update
3801         (if (and gnus-summary-mark-below
3802                  (< (gnus-summary-article-score)
3803                     gnus-summary-mark-below))
3804             ;; This article has a low score, so we mark it as read.
3805             (when (memq article gnus-newsgroup-unreads)
3806               (gnus-summary-mark-article-as-read gnus-low-score-mark))
3807           (when (eq (gnus-summary-article-mark) gnus-low-score-mark)
3808             ;; This article was previously marked as read on account
3809             ;; of a low score, but now it has risen, so we mark it as
3810             ;; unread.
3811             (gnus-summary-mark-article-as-unread gnus-unread-mark)))
3812         (gnus-summary-update-mark
3813          (if (or (null gnus-summary-default-score)
3814                  (<= (abs (- score gnus-summary-default-score))
3815                      gnus-summary-zcore-fuzz))
3816              ?                          ;Whitespace
3817            (if (< score gnus-summary-default-score)
3818                gnus-score-below-mark gnus-score-over-mark))
3819          'score))
3820       ;; Do visual highlighting.
3821       (when (gnus-visual-p 'summary-highlight 'highlight)
3822         (gnus-summary-highlight-line)
3823         (gnus-run-hooks 'gnus-summary-update-hook)))))
3824
3825 (defvar gnus-tmp-new-adopts nil)
3826
3827 (defun gnus-summary-number-of-articles-in-thread (thread &optional level char)
3828   "Return the number of articles in THREAD.
3829 This may be 0 in some cases -- if none of the articles in
3830 the thread are to be displayed."
3831   (let* ((number
3832          ;; Fix by Luc Van Eycken <Luc.VanEycken@esat.kuleuven.ac.be>.
3833           (cond
3834            ((not (listp thread))
3835             1)
3836            ((and (consp thread) (cdr thread))
3837             (apply
3838              '+ 1 (mapcar
3839                    'gnus-summary-number-of-articles-in-thread (cdr thread))))
3840            ((null thread)
3841             1)
3842            ((memq (mail-header-number (car thread)) gnus-newsgroup-limit)
3843             1)
3844            (t 0))))
3845     (when (and level (zerop level) gnus-tmp-new-adopts)
3846       (incf number
3847             (apply '+ (mapcar
3848                        'gnus-summary-number-of-articles-in-thread
3849                        gnus-tmp-new-adopts))))
3850     (if char
3851         (if (> number 1) gnus-not-empty-thread-mark
3852           gnus-empty-thread-mark)
3853       number)))
3854
3855 (defsubst gnus-summary-line-message-size (head)
3856   "Return pretty-printed version of message size.
3857 This function is intended to be used in
3858 `gnus-summary-line-format-alist'."
3859   (let ((c (or (mail-header-chars head) -1)))
3860     (cond ((< c 0) "n/a")               ; chars not available
3861           ((< c (* 1000 10)) (format "%1.1fk" (/ c 1024.0)))
3862           ((< c (* 1000 100)) (format "%dk" (/ c 1024.0)))
3863           ((< c (* 1000 10000)) (format "%1.1fM" (/ c (* 1024.0 1024))))
3864           (t (format "%dM" (/ c (* 1024.0 1024)))))))
3865
3866 (defcustom gnus-user-date-format-alist
3867   '(((gnus-seconds-today) . "Today, %H:%M")
3868     ((+ 86400 (gnus-seconds-today)) . "Yesterday, %H:%M")
3869     (604800 . "%A %H:%M")               ; That's one week
3870     ((gnus-seconds-month) . "%A %d")
3871     ((gnus-seconds-year) . "%B %d")
3872     (t . "%b %d %Y"))                   ; This one is used when no other
3873                                         ; does match
3874   "Specifies date format depending on age of article.
3875 This is an alist of items (AGE . FORMAT).  AGE can be a number (of
3876 seconds) or a Lisp expression evaluating to a number.  When the age of
3877 the article is less than this number, then use `format-time-string'
3878 with the corresponding FORMAT for displaying the date of the article.
3879 If AGE is not a number or a Lisp expression evaluating to a
3880 non-number, then the corresponding FORMAT is used as a default value.
3881
3882 Note that the list is processed from the beginning, so it should be
3883 sorted by ascending AGE.  Also note that items following the first
3884 non-number AGE will be ignored.
3885
3886 You can use the functions `gnus-seconds-today', `gnus-seconds-month'
3887 and `gnus-seconds-year' in the AGE spec.  They return the number of
3888 seconds passed since the start of today, of this month, of this year,
3889 respectively."
3890   :version "24.1"
3891   :group 'gnus-summary-format
3892   :type '(alist :key-type sexp :value-type string))
3893
3894 (defun gnus-user-date (messy-date)
3895   "Format the messy-date according to `gnus-user-date-format-alist'.
3896 Returns \"  ?  \" if there's bad input or if another error occurs.
3897 Input should look like this: \"Sun, 14 Oct 2001 13:34:39 +0200\"."
3898   (condition-case ()
3899       (let* ((messy-date (gnus-float-time (gnus-date-get-time messy-date)))
3900              (now (gnus-float-time))
3901              ;;If we don't find something suitable we'll use this one
3902              (my-format "%b %d '%y"))
3903         (let* ((difference (- now messy-date))
3904                (templist gnus-user-date-format-alist)
3905                (top (eval (caar templist))))
3906           (while (if (numberp top) (< top difference) (not top))
3907             (progn
3908               (setq templist (cdr templist))
3909               (setq top (eval (caar templist)))))
3910           (if (stringp (cdr (car templist)))
3911               (setq my-format (cdr (car templist)))))
3912         (format-time-string (eval my-format) (seconds-to-time messy-date)))
3913     (error "  ?   ")))
3914
3915 (defun gnus-summary-set-local-parameters (group)
3916   "Go through the local params of GROUP and set all variable specs in that list."
3917   (let ((vars '(quit-config active)))   ; Ignore things that aren't
3918                                         ; really variables.
3919     (dolist (elem (gnus-group-find-parameter group))
3920       (and (consp elem)                 ; Has to be a cons.
3921            (consp (cdr elem))           ; The cdr has to be a list.
3922            (symbolp (car elem))         ; Has to be a symbol in there.
3923            (not (memq (car elem) vars))
3924            (ignore-errors
3925              (push (car elem) vars)
3926              ;; Variables like `gnus-show-threads' that are globally
3927              ;; bound, if used as group parameters, need to get to be
3928              ;; buffer-local, whereas just parameters like `gcc-self',
3929              ;; `timestamp', etc. should not be bound as variables.
3930              (if (boundp (car elem))
3931                  (set (make-local-variable (car elem)) (eval (nth 1 elem)))
3932                (eval (nth 1 elem))))))))
3933
3934 (defun gnus-summary-read-group (group &optional show-all no-article
3935                                       kill-buffer no-display backward
3936                                       select-articles)
3937   "Start reading news in newsgroup GROUP.
3938 If SHOW-ALL is non-nil, already read articles are also listed.
3939 If NO-ARTICLE is non-nil, no article is selected initially.
3940 If NO-DISPLAY, don't generate the summary buffer contents.
3941 If KILL-BUFFER, it should be a buffer that's killed once the new
3942 summary buffer has been generated.
3943 If BACKWARD, move point to the previous group in the group buffer
3944 If SELECT-ARTICLES, only select those articles from GROUP."
3945   (let (result)
3946     (while (and group
3947                 (null (setq result
3948                             (let ((gnus-auto-select-next nil))
3949                               (or (gnus-summary-read-group-1
3950                                    group show-all no-article
3951                                    kill-buffer no-display
3952                                    select-articles)
3953                                   (setq show-all nil
3954                                         select-articles nil)))))
3955                 (eq gnus-auto-select-next 'quietly))
3956       (set-buffer gnus-group-buffer)
3957       ;; The entry function called above goes to the next
3958       ;; group automatically, so we go two groups back
3959       ;; if we are searching for the previous group.
3960       (when backward
3961         (gnus-group-prev-unread-group 2))
3962       (if (not (equal group (gnus-group-group-name)))
3963           (setq group (gnus-group-group-name))
3964         (setq group nil)))
3965     result))
3966
3967 (defun gnus-summary-read-group-1 (group show-all no-article
3968                                         kill-buffer no-display
3969                                         &optional select-articles)
3970   ;; Killed foreign groups can't be entered.
3971   ;;  (when (and (not (gnus-group-native-p group))
3972   ;;         (not (gnus-gethash group gnus-newsrc-hashtb)))
3973   ;;    (error "Dead non-native groups can't be entered"))
3974   (gnus-message 7 "Retrieving newsgroup: %s..."
3975                 (gnus-group-decoded-name group))
3976   (let* ((new-group (gnus-summary-setup-buffer group))
3977          (quit-config (gnus-group-quit-config group))
3978          (did-select (and new-group (gnus-select-newsgroup
3979                                      group show-all select-articles))))
3980     (cond
3981      ;; This summary buffer exists already, so we just select it.
3982      ((not new-group)
3983       (gnus-set-global-variables)
3984       (when kill-buffer
3985         (gnus-kill-or-deaden-summary kill-buffer))
3986       (gnus-configure-windows 'summary 'force)
3987       (gnus-set-mode-line 'summary)
3988       (gnus-summary-position-point)
3989       (message "")
3990       t)
3991      ;; We couldn't select this group.
3992      ((null did-select)
3993       (when (and (derived-mode-p 'gnus-summary-mode)
3994                  (not (equal (current-buffer) kill-buffer)))
3995         (kill-buffer (current-buffer))
3996         (if (not quit-config)
3997             (progn
3998               ;; Update the info -- marks might need to be removed,
3999               ;; for instance.
4000               (gnus-summary-update-info)
4001               (set-buffer gnus-group-buffer)
4002               (gnus-group-jump-to-group group)
4003               (gnus-group-next-unread-group 1))
4004           (gnus-handle-ephemeral-exit quit-config)))
4005       (if (null (gnus-list-of-unread-articles group))
4006           (gnus-message 3 "Group %s contains no messages" group)
4007         (gnus-message 3 "Can't select group"))
4008       nil)
4009      ;; The user did a `C-g' while prompting for number of articles,
4010      ;; so we exit this group.
4011      ((eq did-select 'quit)
4012       (and (derived-mode-p 'gnus-summary-mode)
4013            (not (equal (current-buffer) kill-buffer))
4014            (kill-buffer (current-buffer)))
4015       (when kill-buffer
4016         (gnus-kill-or-deaden-summary kill-buffer))
4017       (if (not quit-config)
4018           (progn
4019             (set-buffer gnus-group-buffer)
4020             (gnus-group-jump-to-group group)
4021             (gnus-configure-windows 'group 'force))
4022         (gnus-handle-ephemeral-exit quit-config))
4023       ;; Finally signal the quit.
4024       (signal 'quit nil))
4025      ;; The group was successfully selected.
4026      (t
4027       (gnus-set-global-variables)
4028       (when (boundp 'spam-install-hooks)
4029         (spam-initialize))
4030       ;; Save the active value in effect when the group was entered.
4031       (setq gnus-newsgroup-active
4032             (gnus-copy-sequence
4033              (gnus-active gnus-newsgroup-name)))
4034       (setq gnus-newsgroup-highest (cdr gnus-newsgroup-active))
4035       ;; You can change the summary buffer in some way with this hook.
4036       (gnus-run-hooks 'gnus-select-group-hook)
4037       (when (memq 'summary (gnus-update-format-specifications
4038                             nil 'summary 'summary-mode 'summary-dummy))
4039         ;; The format specification for the summary line was updated,
4040         ;; so we need to update the mark positions as well.
4041         (gnus-update-summary-mark-positions))
4042       ;; Do score processing.
4043       (when gnus-use-scoring
4044         (gnus-possibly-score-headers))
4045       ;; Check whether to fill in the gaps in the threads.
4046       (when gnus-build-sparse-threads
4047         (gnus-build-sparse-threads))
4048       ;; Find the initial limit.
4049       (if show-all
4050           (let ((gnus-newsgroup-dormant nil))
4051             (gnus-summary-initial-limit show-all))
4052         (gnus-summary-initial-limit show-all))
4053       ;; Generate the summary buffer.
4054       (unless no-display
4055         (gnus-summary-prepare))
4056       (when gnus-use-trees
4057         (gnus-tree-open)
4058         (setq gnus-summary-highlight-line-function
4059               'gnus-tree-highlight-article))
4060       ;; If the summary buffer is empty, but there are some low-scored
4061       ;; articles or some excluded dormants, we include these in the
4062       ;; buffer.
4063       (when (and (zerop (buffer-size))
4064                  (not no-display))
4065         (cond (gnus-newsgroup-dormant
4066                (gnus-summary-limit-include-dormant))
4067               ((and gnus-newsgroup-scored show-all)
4068                (gnus-summary-limit-include-expunged t))))
4069       ;; Function `gnus-apply-kill-file' must be called in this hook.
4070       (gnus-run-hooks 'gnus-apply-kill-hook)
4071       (if (and (zerop (buffer-size))
4072                (not no-display))
4073           (progn
4074             ;; This newsgroup is empty.
4075             (gnus-summary-catchup-and-exit nil t)
4076             (gnus-message 6 "No unread news")
4077             (when kill-buffer
4078               (gnus-kill-or-deaden-summary kill-buffer))
4079             ;; Return nil from this function.
4080             nil)
4081         ;; Hide conversation thread subtrees.  We cannot do this in
4082         ;; gnus-summary-prepare-hook since kill processing may not
4083         ;; work with hidden articles.
4084         (gnus-summary-maybe-hide-threads)
4085         (gnus-configure-windows 'summary)
4086         (when kill-buffer
4087           (gnus-kill-or-deaden-summary kill-buffer))
4088         (gnus-summary-auto-select-subject)
4089         ;; Show first unread article if requested.
4090         (if (and (not no-article)
4091                  (not no-display)
4092                  gnus-newsgroup-unreads
4093                  gnus-auto-select-first)
4094             (progn
4095               (let ((art (gnus-summary-article-number)))
4096                 (when (and art
4097                            gnus-plugged
4098                            (not (memq art gnus-newsgroup-undownloaded))
4099                            (not (memq art gnus-newsgroup-downloadable)))
4100                   (gnus-summary-goto-article art))))
4101           ;; Don't select any articles.
4102           (gnus-summary-position-point)
4103           (gnus-configure-windows 'summary 'force)
4104           (gnus-set-mode-line 'summary))
4105         (when (and gnus-auto-center-group
4106                    (get-buffer-window gnus-group-buffer t))
4107           ;; Gotta use windows, because recenter does weird stuff if
4108           ;; the current buffer ain't the displayed window.
4109           (let ((owin (selected-window)))
4110             (select-window (get-buffer-window gnus-group-buffer t))
4111             (when (gnus-group-goto-group group)
4112               (recenter))
4113             (select-window owin)))
4114         ;; Mark this buffer as "prepared".
4115         (setq gnus-newsgroup-prepared t)
4116         (gnus-run-hooks 'gnus-summary-prepared-hook)
4117         (unless (gnus-ephemeral-group-p group)
4118           (gnus-group-update-group group nil t))
4119         t)))))
4120
4121 (defun gnus-summary-auto-select-subject ()
4122   "Select the subject line on initial group entry."
4123   (goto-char (point-min))
4124   (cond
4125    ((eq gnus-auto-select-subject 'best)
4126     (gnus-summary-best-unread-subject))
4127    ((eq gnus-auto-select-subject 'unread)
4128     (gnus-summary-first-unread-subject))
4129    ((eq gnus-auto-select-subject 'unseen)
4130     (gnus-summary-first-unseen-subject))
4131    ((eq gnus-auto-select-subject 'unseen-or-unread)
4132     (gnus-summary-first-unseen-or-unread-subject))
4133    ((eq gnus-auto-select-subject 'first)
4134     ;; Do nothing.
4135     )
4136    ((functionp gnus-auto-select-subject)
4137     (funcall gnus-auto-select-subject))))
4138
4139 (defun gnus-summary-prepare ()
4140   "Generate the summary buffer."
4141   (interactive)
4142   (let ((inhibit-read-only t))
4143     (erase-buffer)
4144     (setq gnus-newsgroup-data nil
4145           gnus-newsgroup-data-reverse nil)
4146     (gnus-run-hooks 'gnus-summary-generate-hook)
4147     ;; Generate the buffer, either with threads or without.
4148     (when gnus-newsgroup-headers
4149       (gnus-summary-prepare-threads
4150        (if gnus-show-threads
4151            (gnus-sort-gathered-threads
4152             (funcall gnus-summary-thread-gathering-function
4153                      (gnus-sort-threads
4154                       (gnus-cut-threads (gnus-make-threads)))))
4155          ;; Unthreaded display.
4156          (gnus-sort-articles gnus-newsgroup-headers))))
4157     (setq gnus-newsgroup-data (nreverse gnus-newsgroup-data))
4158     ;; Call hooks for modifying summary buffer.
4159     (goto-char (point-min))
4160     (gnus-run-hooks 'gnus-summary-prepare-hook)))
4161
4162 (defsubst gnus-general-simplify-subject (subject)
4163   "Simplify subject by the same rules as `gnus-gather-threads-by-subject'."
4164   (setq subject
4165         (cond
4166          ;; Truncate the subject.
4167          (gnus-simplify-subject-functions
4168           (gnus-map-function gnus-simplify-subject-functions subject))
4169          ((numberp gnus-summary-gather-subject-limit)
4170           (setq subject (gnus-simplify-subject-re subject))
4171           (if (> (length subject) gnus-summary-gather-subject-limit)
4172               (substring subject 0 gnus-summary-gather-subject-limit)
4173             subject))
4174          ;; Fuzzily simplify it.
4175          ((eq 'fuzzy gnus-summary-gather-subject-limit)
4176           (gnus-simplify-subject-fuzzy subject))
4177          ;; Just remove the leading "Re:".
4178          (t
4179           (gnus-simplify-subject-re subject))))
4180
4181   (if (and gnus-summary-gather-exclude-subject
4182            (string-match gnus-summary-gather-exclude-subject subject))
4183       nil                         ; This article shouldn't be gathered
4184     subject))
4185
4186 (defun gnus-summary-simplify-subject-query ()
4187   "Query where the respool algorithm would put this article."
4188   (interactive)
4189   (gnus-summary-select-article)
4190   (message "%s" (gnus-general-simplify-subject (gnus-summary-article-subject))))
4191
4192 (defun gnus-gather-threads-by-subject (threads)
4193   "Gather threads by looking at Subject headers."
4194   (if (not gnus-summary-make-false-root)
4195       threads
4196     (let ((hashtb (gnus-make-hashtable 1024))
4197           (prev threads)
4198           (result threads)
4199           subject hthread whole-subject)
4200       (while threads
4201         (setq subject (gnus-general-simplify-subject
4202                        (setq whole-subject (mail-header-subject
4203                                             (caar threads)))))
4204         (when subject
4205           (if (setq hthread (gnus-gethash subject hashtb))
4206               (progn
4207                 ;; We enter a dummy root into the thread, if we
4208                 ;; haven't done that already.
4209                 (unless (stringp (caar hthread))
4210                   (setcar hthread (list whole-subject (car hthread))))
4211                 ;; We add this new gathered thread to this gathered
4212                 ;; thread.
4213                 (setcdr (car hthread)
4214                         (nconc (cdar hthread) (list (car threads))))
4215                 ;; Remove it from the list of threads.
4216                 (setcdr prev (cdr threads))
4217                 (setq threads prev))
4218             ;; Enter this thread into the hash table.
4219             (gnus-sethash subject
4220                           (if gnus-summary-make-false-root-always
4221                               (progn
4222                                 ;; If you want a dummy root above all
4223                                 ;; threads...
4224                                 (setcar threads (list whole-subject
4225                                                       (car threads)))
4226                                 threads)
4227                             threads)
4228                           hashtb)))
4229         (setq prev threads)
4230         (setq threads (cdr threads)))
4231       result)))
4232
4233 (defun gnus-gather-threads-by-references (threads)
4234   "Gather threads by looking at References headers."
4235   (let ((idhashtb (gnus-make-hashtable 1024))
4236         (thhashtb (gnus-make-hashtable 1024))
4237         (prev threads)
4238         (result threads)
4239         ids references id gthread gid entered ref)
4240     (while threads
4241       (when (setq references (mail-header-references (caar threads)))
4242         (setq id (mail-header-id (caar threads))
4243               ids (inline (gnus-split-references references))
4244               entered nil)
4245         (while (setq ref (pop ids))
4246           (setq ids (delete ref ids))
4247           (if (not (setq gid (gnus-gethash ref idhashtb)))
4248               (progn
4249                 (gnus-sethash ref id idhashtb)
4250                 (gnus-sethash id threads thhashtb))
4251             (setq gthread (gnus-gethash gid thhashtb))
4252             (unless entered
4253               ;; We enter a dummy root into the thread, if we
4254               ;; haven't done that already.
4255               (unless (stringp (caar gthread))
4256                 (setcar gthread (list (mail-header-subject (caar gthread))
4257                                       (car gthread))))
4258               ;; We add this new gathered thread to this gathered
4259               ;; thread.
4260               (setcdr (car gthread)
4261                       (nconc (cdar gthread) (list (car threads)))))
4262             ;; Add it into the thread hash table.
4263             (gnus-sethash id gthread thhashtb)
4264             (setq entered t)
4265             ;; Remove it from the list of threads.
4266             (setcdr prev (cdr threads))
4267             (setq threads prev))))
4268       (setq prev threads)
4269       (setq threads (cdr threads)))
4270     result))
4271
4272 (defun gnus-sort-gathered-threads (threads)
4273   "Sort subthreads inside each gathered thread by `gnus-sort-gathered-threads-function'."
4274   (let ((result threads))
4275     (while threads
4276       (when (stringp (caar threads))
4277         (setcdr (car threads)
4278                 (sort (cdar threads) gnus-sort-gathered-threads-function)))
4279       (setq threads (cdr threads)))
4280     result))
4281
4282 (defun gnus-thread-loop-p (root thread)
4283   "Say whether ROOT is in THREAD."
4284   (let ((stack (list thread))
4285         (infloop 0)
4286         th)
4287     (while (setq thread (pop stack))
4288       (setq th (cdr thread))
4289       (while (and th
4290                   (not (eq (caar th) root)))
4291         (pop th))
4292       (if th
4293           ;; We have found a loop.
4294           (let (ref-dep)
4295             (setcdr thread (delq (car th) (cdr thread)))
4296             (if (boundp (setq ref-dep (intern "none"
4297                                               gnus-newsgroup-dependencies)))
4298                 (setcdr (symbol-value ref-dep)
4299                         (nconc (cdr (symbol-value ref-dep))
4300                                (list (car th))))
4301               (set ref-dep (list nil (car th))))
4302             (setq infloop 1
4303                   stack nil))
4304         ;; Push all the subthreads onto the stack.
4305         (push (cdr thread) stack)))
4306     infloop))
4307
4308 (defun gnus-make-threads ()
4309   "Go through the dependency hashtb and find the roots.  Return all threads."
4310   (let (threads)
4311     (while (catch 'infloop
4312              (mapatoms
4313               (lambda (refs)
4314                 ;; Deal with self-referencing References loops.
4315                 (when (and (car (symbol-value refs))
4316                            (not (zerop
4317                                  (apply
4318                                   '+
4319                                   (mapcar
4320                                    (lambda (thread)
4321                                      (gnus-thread-loop-p
4322                                       (car (symbol-value refs)) thread))
4323                                    (cdr (symbol-value refs)))))))
4324                   (setq threads nil)
4325                   (throw 'infloop t))
4326                 (unless (car (symbol-value refs))
4327                   ;; These threads do not refer back to any other
4328                   ;; articles, so they're roots.
4329                   (setq threads (append (cdr (symbol-value refs)) threads))))
4330               gnus-newsgroup-dependencies)))
4331     threads))
4332
4333 ;; Build the thread tree.
4334 (defsubst gnus-dependencies-add-header (header dependencies force-new)
4335   "Enter HEADER into the DEPENDENCIES table if it is not already there.
4336
4337 If FORCE-NEW is not nil, enter HEADER into the DEPENDENCIES table even
4338 if it was already present.
4339
4340 If `gnus-summary-ignore-duplicates' is nil then duplicate Message-IDs
4341 will not be entered in the DEPENDENCIES table.  Otherwise duplicate
4342 Message-IDs will be renamed to a unique Message-ID before being
4343 entered.
4344
4345 Returns HEADER if it was entered in the DEPENDENCIES.  Returns nil otherwise."
4346   (let* ((id (mail-header-id header))
4347          (id-dep (and id (intern id dependencies)))
4348          parent-id ref ref-dep ref-header replaced)
4349     ;; Enter this `header' in the `dependencies' table.
4350     (cond
4351      ((not id-dep)
4352       (setq header nil))
4353      ;; The first two cases do the normal part: enter a new `header'
4354      ;; in the `dependencies' table.
4355      ((not (boundp id-dep))
4356       (set id-dep (list header)))
4357      ((null (car (symbol-value id-dep)))
4358       (setcar (symbol-value id-dep) header))
4359
4360      ;; From here the `header' was already present in the
4361      ;; `dependencies' table.
4362      (force-new
4363       ;; Overrides an existing entry;
4364       ;; just set the header part of the entry.
4365       (setcar (symbol-value id-dep) header)
4366       (setq replaced t))
4367
4368      ;; Renames the existing `header' to a unique Message-ID.
4369      ((not gnus-summary-ignore-duplicates)
4370       ;; An article with this Message-ID has already been seen.
4371       ;; We rename the Message-ID.
4372       (set (setq id-dep (intern (setq id (nnmail-message-id)) dependencies))
4373            (list header))
4374       (mail-header-set-id header id))
4375
4376      ;; The last case ignores an existing entry, except it adds any
4377      ;; additional Xrefs (in case the two articles came from different
4378      ;; servers.
4379      ;; Also sets `header' to `nil' meaning that the `dependencies'
4380      ;; table was *not* modified.
4381      (t
4382       (mail-header-set-xref
4383        (car (symbol-value id-dep))
4384        (concat (or (mail-header-xref (car (symbol-value id-dep)))
4385                    "")
4386                (or (mail-header-xref header) "")))
4387       (setq header nil)))
4388
4389     (when (and header (not replaced))
4390       ;; First check that we are not creating a References loop.
4391       (setq parent-id (gnus-parent-id (mail-header-references header)))
4392       (setq ref parent-id)
4393       (while (and ref
4394                   (setq ref-dep (intern-soft ref dependencies))
4395                   (boundp ref-dep)
4396                   (setq ref-header (car (symbol-value ref-dep))))
4397         (if (string= id ref)
4398             ;; Yuk!  This is a reference loop.  Make the article be a
4399             ;; root article.
4400             (progn
4401               (mail-header-set-references (car (symbol-value id-dep)) "none")
4402               (setq ref nil)
4403               (setq parent-id nil))
4404           (setq ref (gnus-parent-id (mail-header-references ref-header)))))
4405       (setq ref-dep (intern (or parent-id "none") dependencies))
4406       (if (boundp ref-dep)
4407           (setcdr (symbol-value ref-dep)
4408                   (nconc (cdr (symbol-value ref-dep))
4409                          (list (symbol-value id-dep))))
4410         (set ref-dep (list nil (symbol-value id-dep)))))
4411     header))
4412
4413 (defun gnus-extract-message-id-from-in-reply-to (string)
4414   (if (string-match "<[^>]+>" string)
4415       (substring string (match-beginning 0) (match-end 0))
4416     nil))
4417
4418 (defun gnus-build-sparse-threads ()
4419   (let ((headers gnus-newsgroup-headers)
4420         (mail-parse-charset gnus-newsgroup-charset)
4421         (gnus-summary-ignore-duplicates t)
4422         header references generation relations
4423         subject child end new-child date)
4424     ;; First we create an alist of generations/relations, where
4425     ;; generations is how much we trust the relation, and the relation
4426     ;; is parent/child.
4427     (gnus-message 7 "Making sparse threads...")
4428     (save-excursion
4429       (nnheader-set-temp-buffer " *gnus sparse threads*")
4430       (while (setq header (pop headers))
4431         (when (and (setq references (mail-header-references header))
4432                    (not (string= references "")))
4433           (insert references)
4434           (setq child (mail-header-id header)
4435                 subject (mail-header-subject header)
4436                 date (mail-header-date header)
4437                 generation 0)
4438           (while (search-backward ">" nil t)
4439             (setq end (1+ (point)))
4440             (when (search-backward "<" nil t)
4441               (setq new-child (buffer-substring (point) end))
4442               (push (list (incf generation)
4443                           child (setq child new-child)
4444                           subject date)
4445                     relations)))
4446           (when child
4447             (push (list (1+ generation) child nil subject) relations))
4448           (erase-buffer)))
4449       (kill-buffer (current-buffer)))
4450     ;; Sort over trustworthiness.
4451     (dolist (relation (sort relations 'car-less-than-car))
4452       (when (gnus-dependencies-add-header
4453              (make-full-mail-header
4454               gnus-reffed-article-number
4455               (nth 3 relation) "" (or (nth 4 relation) "")
4456               (nth 1 relation)
4457               (or (nth 2 relation) "") 0 0 "")
4458              gnus-newsgroup-dependencies nil)
4459         (push gnus-reffed-article-number gnus-newsgroup-limit)
4460         (push gnus-reffed-article-number gnus-newsgroup-sparse)
4461         (push (cons gnus-reffed-article-number gnus-sparse-mark)
4462               gnus-newsgroup-reads)
4463         (decf gnus-reffed-article-number)))
4464     (gnus-message 7 "Making sparse threads...done")))
4465
4466 (defun gnus-build-old-threads ()
4467   ;; Look at all the articles that refer back to old articles, and
4468   ;; fetch the headers for the articles that aren't there.  This will
4469   ;; build complete threads - if the roots haven't been expired by the
4470   ;; server, that is.
4471   (let ((mail-parse-charset gnus-newsgroup-charset)
4472         id heads)
4473     (mapatoms
4474      (lambda (refs)
4475        (when (not (car (symbol-value refs)))
4476          (setq heads (cdr (symbol-value refs)))
4477          (while heads
4478            (if (memq (mail-header-number (caar heads))
4479                      gnus-newsgroup-dormant)
4480                (setq heads (cdr heads))
4481              (setq id (symbol-name refs))
4482              (while (and (setq id (gnus-build-get-header id))
4483                          (not (car (gnus-id-to-thread id)))))
4484              (setq heads nil)))))
4485      gnus-newsgroup-dependencies)))
4486
4487 (defsubst gnus-remove-odd-characters (string)
4488   "Translate STRING into something that doesn't contain weird characters."
4489   (mm-subst-char-in-string
4490    ?\r ?\-
4491    (mm-subst-char-in-string ?\n ?\- string t) t))
4492
4493 ;; This function has to be called with point after the article number
4494 ;; on the beginning of the line.
4495 (defsubst gnus-nov-parse-line (number dependencies &optional force-new)
4496   (let ((eol (point-at-eol))
4497         (buffer (current-buffer))
4498         header references in-reply-to)
4499
4500     ;; overview: [num subject from date id refs chars lines misc]
4501     (unwind-protect
4502         (let (x)
4503           (narrow-to-region (point) eol)
4504           (unless (eobp)
4505             (forward-char))
4506
4507           (setq header
4508                 (make-full-mail-header
4509                  number                 ; number
4510                  (condition-case ()     ; subject
4511                      (gnus-remove-odd-characters
4512                       (funcall gnus-decode-encoded-word-function
4513                                (setq x (nnheader-nov-field))))
4514                    (error x))
4515                  (condition-case ()     ; from
4516                      (gnus-remove-odd-characters
4517                       (funcall gnus-decode-encoded-address-function
4518                                (setq x (nnheader-nov-field))))
4519                    (error x))
4520                  (nnheader-nov-field)   ; date
4521                  (nnheader-nov-read-message-id number)  ; id
4522                  (setq references (nnheader-nov-field)) ; refs
4523                  (nnheader-nov-read-integer) ; chars
4524                  (nnheader-nov-read-integer) ; lines
4525                  (unless (eobp)
4526                    (if (looking-at "Xref: ")
4527                        (goto-char (match-end 0)))
4528                    (nnheader-nov-field)) ; Xref
4529                  (nnheader-nov-parse-extra)))) ; extra
4530
4531       (widen))
4532
4533     (when (and (string= references "")
4534                (setq in-reply-to (mail-header-extra header))
4535                (setq in-reply-to (cdr (assq 'In-Reply-To in-reply-to))))
4536       (mail-header-set-references
4537        header (gnus-extract-message-id-from-in-reply-to in-reply-to)))
4538
4539     (when gnus-alter-header-function
4540       (funcall gnus-alter-header-function header))
4541     (gnus-dependencies-add-header header dependencies force-new)))
4542
4543 (defun gnus-build-get-header (id)
4544   "Look through the buffer of NOV lines and find the header to ID.
4545 Enter this line into the dependencies hash table, and return
4546 the id of the parent article (if any)."
4547   (let ((deps gnus-newsgroup-dependencies)
4548         found header)
4549     (prog1
4550         (with-current-buffer nntp-server-buffer
4551           (let ((case-fold-search nil))
4552             (goto-char (point-min))
4553             (while (and (not found)
4554                         (search-forward id nil t))
4555               (beginning-of-line)
4556               (setq found (looking-at
4557                            (format "^[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t%s"
4558                                    (regexp-quote id))))
4559               (or found (beginning-of-line 2)))
4560             (when found
4561               (beginning-of-line)
4562               (and
4563                (setq header (gnus-nov-parse-line
4564                              (read (current-buffer)) deps))
4565                (gnus-parent-id (mail-header-references header))))))
4566       (when header
4567         (let ((number (mail-header-number header)))
4568           (push number gnus-newsgroup-limit)
4569           (push header gnus-newsgroup-headers)
4570           (if (memq number gnus-newsgroup-unselected)
4571               (progn
4572                 (setq gnus-newsgroup-unreads
4573                       (gnus-add-to-sorted-list gnus-newsgroup-unreads
4574                                                number))
4575                 (setq gnus-newsgroup-unselected
4576                       (delq number gnus-newsgroup-unselected)))
4577             (push number gnus-newsgroup-ancient)))))))
4578
4579 (defun gnus-build-all-threads ()
4580   "Read all the headers."
4581   (let ((gnus-summary-ignore-duplicates t)
4582         (mail-parse-charset gnus-newsgroup-charset)
4583         (dependencies gnus-newsgroup-dependencies)
4584         header article)
4585     (with-current-buffer nntp-server-buffer
4586       (let ((case-fold-search nil))
4587         (goto-char (point-min))
4588         (while (not (eobp))
4589           (ignore-errors
4590             (setq article (read (current-buffer))
4591                   header (gnus-nov-parse-line article dependencies t)))
4592           (when header
4593             (with-current-buffer gnus-summary-buffer
4594               (push header gnus-newsgroup-headers)
4595               (if (memq (setq article (mail-header-number header))
4596                         gnus-newsgroup-unselected)
4597                   (progn
4598                     (setq gnus-newsgroup-unreads
4599                           (gnus-add-to-sorted-list
4600                            gnus-newsgroup-unreads article))
4601                     (setq gnus-newsgroup-unselected
4602                           (delq article gnus-newsgroup-unselected)))
4603                 (push article gnus-newsgroup-ancient)))
4604             (forward-line 1)))))))
4605
4606 (defun gnus-summary-update-article-line (article header)
4607   "Update the line for ARTICLE using HEADER."
4608   (let* ((id (mail-header-id header))
4609          (thread (gnus-id-to-thread id)))
4610     (unless thread
4611       (error "Article in no thread"))
4612     ;; Update the thread.
4613     (setcar thread header)
4614     (gnus-summary-goto-subject article)
4615     (let* ((datal (gnus-data-find-list article))
4616            (data (car datal))
4617            (inhibit-read-only t)
4618            (level (gnus-summary-thread-level)))
4619       (gnus-delete-line)
4620       (let ((inserted (- (point)
4621                          (progn
4622                            (gnus-summary-insert-line
4623                             header level nil
4624                             (memq article gnus-newsgroup-undownloaded)
4625                             (gnus-article-mark article)
4626                             (memq article gnus-newsgroup-replied)
4627                             (memq article gnus-newsgroup-expirable)
4628                             ;; Only insert the Subject string when it's different
4629                             ;; from the previous Subject string.
4630                             (if (and
4631                                  gnus-show-threads
4632                                  (gnus-subject-equal
4633                                   (condition-case ()
4634                                       (mail-header-subject
4635                                        (gnus-data-header
4636                                         (cadr
4637                                          (gnus-data-find-list
4638                                           article
4639                                           (gnus-data-list t)))))
4640                                     ;; Error on the side of excessive subjects.
4641                                     (error ""))
4642                                   (mail-header-subject header)))
4643                                 ""
4644                               (mail-header-subject header))
4645                             nil (cdr (assq article gnus-newsgroup-scored))
4646                             (memq article gnus-newsgroup-processable))
4647                            (point)))))
4648         (when (cdr datal)
4649           (gnus-data-update-list
4650            (cdr datal)
4651            (- (gnus-data-pos data) (gnus-data-pos (cadr datal)) inserted)))))))
4652
4653 (defun gnus-summary-update-article (article &optional iheader)
4654   "Update ARTICLE in the summary buffer."
4655   (set-buffer gnus-summary-buffer)
4656   (let* ((header (gnus-summary-article-header article))
4657          (id (mail-header-id header))
4658          (data (gnus-data-find article))
4659          (thread (gnus-id-to-thread id))
4660          (references (mail-header-references header))
4661          (parent
4662           (gnus-id-to-thread
4663            (or (gnus-parent-id
4664                 (when (and references
4665                            (not (equal "" references)))
4666                   references))
4667                "none")))
4668          (inhibit-read-only t)
4669          (old (car thread)))
4670     (when thread
4671       (unless iheader
4672         (setcar thread nil)
4673         (when parent
4674           (delq thread parent)))
4675       (if (gnus-summary-insert-subject id header)
4676           ;; Set the (possibly) new article number in the data structure.
4677           (gnus-data-set-number data (gnus-id-to-article id))
4678         (setcar thread old)
4679         nil))))
4680
4681 (defun gnus-rebuild-thread (id &optional line)
4682   "Rebuild the thread containing ID.
4683 If LINE, insert the rebuilt thread starting on line LINE."
4684   (let ((inhibit-read-only t)
4685         old-pos current thread data)
4686     (if (not gnus-show-threads)
4687         (setq thread (list (car (gnus-id-to-thread id))))
4688       ;; Get the thread this article is part of.
4689       (setq thread (gnus-remove-thread id)))
4690     (setq old-pos (point-at-bol))
4691     (setq current (save-excursion
4692                     (and (re-search-backward "[\r\n]" nil t)
4693                          (gnus-summary-article-number))))
4694     ;; If this is a gathered thread, we have to go some re-gathering.
4695     (when (stringp (car thread))
4696       (let ((subject (car thread))
4697             roots thr)
4698         (setq thread (cdr thread))
4699         (while thread
4700           (unless (memq (setq thr (gnus-id-to-thread
4701                                    (gnus-root-id
4702                                     (mail-header-id (caar thread)))))
4703                         roots)
4704             (push thr roots))
4705           (setq thread (cdr thread)))
4706         ;; We now have all (unique) roots.
4707         (if (= (length roots) 1)
4708             ;; All the loose roots are now one solid root.
4709             (setq thread (car roots))
4710           (setq thread (cons subject (gnus-sort-threads roots))))))
4711     (let (threads)
4712       ;; We then insert this thread into the summary buffer.
4713       (when line
4714         (goto-char (point-min))
4715         (forward-line (1- line)))
4716       (let (gnus-newsgroup-data gnus-newsgroup-threads)
4717         (if gnus-show-threads
4718             (gnus-summary-prepare-threads (gnus-cut-threads (list thread)))
4719           (gnus-summary-prepare-unthreaded thread))
4720         (setq data (nreverse gnus-newsgroup-data))
4721         (setq threads gnus-newsgroup-threads))
4722       ;; We splice the new data into the data structure.
4723       ;;!!! This is kinda bogus.  We assume that in LINE is non-nil,
4724       ;;!!! then we want to insert at the beginning of the buffer.
4725       ;;!!! That happens to be true with Gnus now, but that may
4726       ;;!!! change in the future.  Perhaps.
4727       (gnus-data-enter-list
4728        (if line nil current) data (- (point) old-pos))
4729       (setq gnus-newsgroup-threads
4730             (nconc threads gnus-newsgroup-threads))
4731       (gnus-data-compute-positions))))
4732
4733 (defun gnus-number-to-header (number)
4734   "Return the header for article NUMBER."
4735   (let ((headers gnus-newsgroup-headers))
4736     (while (and headers
4737                 (not (= number (mail-header-number (car headers)))))
4738       (pop headers))
4739     (when headers
4740       (car headers))))
4741
4742 (defun gnus-parent-headers (in-headers &optional generation)
4743   "Return the headers of the GENERATIONth parent of HEADERS."
4744   (unless generation
4745     (setq generation 1))
4746   (let ((parent t)
4747         (headers in-headers)
4748         references)
4749     (while (and parent
4750                 (not (zerop generation))
4751                 (setq references (mail-header-references headers)))
4752       (setq headers (if (and references
4753                              (setq parent (gnus-parent-id references)))
4754                         (car (gnus-id-to-thread parent))
4755                       nil))
4756       (decf generation))
4757     (and (not (eq headers in-headers))
4758          headers)))
4759
4760 (defun gnus-id-to-thread (id)
4761   "Return the (sub-)thread where ID appears."
4762   (gnus-gethash id gnus-newsgroup-dependencies))
4763
4764 (defun gnus-id-to-article (id)
4765   "Return the article number of ID."
4766   (let ((thread (gnus-id-to-thread id)))
4767     (when (and thread
4768                (car thread))
4769       (mail-header-number (car thread)))))
4770
4771 (defun gnus-id-to-header (id)
4772   "Return the article headers of ID."
4773   (car (gnus-id-to-thread id)))
4774
4775 (defun gnus-article-displayed-root-p (article)
4776   "Say whether ARTICLE is a root(ish) article."
4777   (let ((level (gnus-summary-thread-level article))
4778         (refs (mail-header-references  (gnus-summary-article-header article)))
4779         particle)
4780     (cond
4781      ((null level) nil)
4782      ((zerop level) t)
4783      ((null refs) t)
4784      ((null (gnus-parent-id refs)) t)
4785      ((and (= 1 level)
4786            (null (setq particle (gnus-id-to-article
4787                                  (gnus-parent-id refs))))
4788            (null (gnus-summary-thread-level particle)))))))
4789
4790 (defun gnus-root-id (id)
4791   "Return the id of the root of the thread where ID appears."
4792   (let (last-id prev)
4793     (while (and id (setq prev (car (gnus-id-to-thread id))))
4794       (setq last-id id
4795             id (gnus-parent-id (mail-header-references prev))))
4796     last-id))
4797
4798 (defun gnus-articles-in-thread (thread)
4799   "Return the list of articles in THREAD."
4800   (cons (mail-header-number (car thread))
4801         (apply 'nconc (mapcar 'gnus-articles-in-thread (cdr thread)))))
4802
4803 (defun gnus-remove-thread (id &optional dont-remove)
4804   "Remove the thread that has ID in it."
4805   (let (headers thread last-id)
4806     ;; First go up in this thread until we find the root.
4807     (setq last-id (gnus-root-id id)
4808           headers (message-flatten-list (gnus-id-to-thread last-id)))
4809     ;; We have now found the real root of this thread.  It might have
4810     ;; been gathered into some loose thread, so we have to search
4811     ;; through the threads to find the thread we wanted.
4812     (let ((threads gnus-newsgroup-threads)
4813           sub)
4814       (while threads
4815         (setq sub (car threads))
4816         (if (stringp (car sub))
4817             ;; This is a gathered thread, so we look at the roots
4818             ;; below it to find whether this article is in this
4819             ;; gathered root.
4820             (progn
4821               (setq sub (cdr sub))
4822               (while sub
4823                 (when (member (caar sub) headers)
4824                   (setq thread (car threads)
4825                         threads nil
4826                         sub nil))
4827                 (setq sub (cdr sub))))
4828           ;; It's an ordinary thread, so we check it.
4829           (when (eq (car sub) (car headers))
4830             (setq thread sub
4831                   threads nil)))
4832         (setq threads (cdr threads)))
4833       ;; If this article is in no thread, then it's a root.
4834       (if thread
4835           (unless dont-remove
4836             (setq gnus-newsgroup-threads (delq thread gnus-newsgroup-threads)))
4837         (setq thread (gnus-id-to-thread last-id)))
4838       (when thread
4839         (prog1
4840             thread                      ; We return this thread.
4841           (unless dont-remove
4842             (if (stringp (car thread))
4843                 (progn
4844                   ;; If we use dummy roots, then we have to remove the
4845                   ;; dummy root as well.
4846                   (when (eq gnus-summary-make-false-root 'dummy)
4847                     ;; We go to the dummy root by going to
4848                     ;; the first sub-"thread", and then one line up.
4849                     (gnus-summary-goto-article
4850                      (mail-header-number (caadr thread)))
4851                     (forward-line -1)
4852                     (gnus-delete-line)
4853                     (gnus-data-compute-positions))
4854                   (setq thread (cdr thread))
4855                   (while thread
4856                     (gnus-remove-thread-1 (car thread))
4857                     (setq thread (cdr thread))))
4858               (gnus-remove-thread-1 thread))))))))
4859
4860 (defun gnus-remove-thread-1 (thread)
4861   "Remove the thread THREAD recursively."
4862   (let ((number (mail-header-number (pop thread)))
4863         d)
4864     (setq thread (reverse thread))
4865     (while thread
4866       (gnus-remove-thread-1 (pop thread)))
4867     (when (setq d (gnus-data-find number))
4868       (goto-char (gnus-data-pos d))
4869       (gnus-summary-show-thread)
4870       (gnus-data-remove
4871        number
4872        (- (point-at-bol)
4873           (prog1
4874               (1+ (point-at-eol))
4875             (gnus-delete-line)))))))
4876
4877 (defun gnus-sort-threads-recursive (threads func)
4878   ;; Responsible for sorting the root articles of threads.
4879   (let ((subthread-sort-func (if (eq gnus-subthread-sort-functions
4880                                      'gnus-thread-sort-functions)
4881                                  func
4882                                (gnus-make-sort-function
4883                                 gnus-subthread-sort-functions))))
4884     (sort (mapcar (lambda (thread)
4885                     (cons (car thread)
4886                           (and (cdr thread)
4887                                (gnus-sort-subthreads-recursive
4888                                 (cdr thread) subthread-sort-func))))
4889                   threads) func)))
4890
4891 (defun gnus-sort-subthreads-recursive (threads func)
4892   ;; Responsible for sorting subthreads.
4893   (sort (mapcar (lambda (thread)
4894                   (cons (car thread)
4895                         (and (cdr thread)
4896                              (gnus-sort-subthreads-recursive (cdr thread) func))))
4897                 threads) func))
4898
4899 (defun gnus-sort-threads-loop (threads func)
4900   (let* ((superthread (cons nil threads))
4901          (stack (list (cons superthread threads)))
4902          remaining-threads thread)
4903     (while stack
4904       (setq remaining-threads (cdr (car stack)))
4905       (if remaining-threads
4906           (progn (setq thread (car remaining-threads))
4907                  (setcdr (car stack) (cdr remaining-threads))
4908                  (if (cdr thread)
4909                      (push (cons thread (cdr thread)) stack)))
4910         (setq thread (caar stack))
4911         (setcdr thread (sort (cdr thread) func))
4912         (pop stack)))
4913     (cdr superthread)))
4914
4915 (defun gnus-sort-threads (threads)
4916   "Sort THREADS."
4917   (if (not gnus-thread-sort-functions)
4918       threads
4919     (gnus-message 8 "Sorting threads...")
4920     (prog1
4921         (condition-case nil
4922             (let ((max-lisp-eval-depth (max max-lisp-eval-depth 5000))
4923                   (sort-func (gnus-make-sort-function gnus-thread-sort-functions)))
4924               (gnus-sort-threads-recursive threads sort-func))
4925           ;; Even after binding max-lisp-eval-depth, the recursive
4926           ;; sorter might fail for very long threads.  In that case,
4927           ;; try using a (less well-tested) non-recursive sorter.
4928           (error (gnus-message 9 "Sorting threads with loop...")
4929                  (gnus-sort-threads-loop
4930                   threads (gnus-make-sort-function
4931                            gnus-thread-sort-functions))))
4932       (gnus-message 8 "Sorting threads...done"))))
4933
4934 (defun gnus-sort-articles (articles)
4935   "Sort ARTICLES."
4936   (when gnus-article-sort-functions
4937     (gnus-message 7 "Sorting articles...")
4938     (prog1
4939         (setq gnus-newsgroup-headers
4940               (sort articles (gnus-make-sort-function
4941                               gnus-article-sort-functions)))
4942       (gnus-message 7 "Sorting articles...done"))))
4943
4944 ;; Written by Hallvard B Furuseth <h.b.furuseth@usit.uio.no>.
4945 (defmacro gnus-thread-header (thread)
4946   "Return header of first article in THREAD.
4947 Note that THREAD must never, ever be anything else than a variable -
4948 using some other form will lead to serious barfage."
4949   (or (symbolp thread) (signal 'wrong-type-argument '(symbolp thread)))
4950   ;; (8% speedup to gnus-summary-prepare, just for fun :-)
4951   (list 'byte-code "\10\211:\203\17\0\211@;\203\16\0A@@\207"
4952         (vector thread) 2))
4953
4954 (defsubst gnus-article-sort-by-number (h1 h2)
4955   "Sort articles by article number."
4956   (< (mail-header-number h1)
4957      (mail-header-number h2)))
4958
4959 (defun gnus-thread-sort-by-number (h1 h2)
4960   "Sort threads by root article number."
4961   (gnus-article-sort-by-number
4962    (gnus-thread-header h1) (gnus-thread-header h2)))
4963
4964 (defsubst gnus-article-sort-by-random (h1 h2)
4965   "Sort articles randomly."
4966   (zerop (random 2)))
4967
4968 (defun gnus-thread-sort-by-random (h1 h2)
4969   "Sort threads randomly."
4970   (gnus-article-sort-by-random
4971    (gnus-thread-header h1) (gnus-thread-header h2)))
4972
4973 (defsubst gnus-article-sort-by-lines (h1 h2)
4974   "Sort articles by article Lines header."
4975   (< (mail-header-lines h1)
4976      (mail-header-lines h2)))
4977
4978 (defun gnus-thread-sort-by-lines (h1 h2)
4979   "Sort threads by root article Lines header."
4980   (gnus-article-sort-by-lines
4981    (gnus-thread-header h1) (gnus-thread-header h2)))
4982
4983 (defsubst gnus-article-sort-by-chars (h1 h2)
4984   "Sort articles by octet length."
4985   (< (mail-header-chars h1)
4986      (mail-header-chars h2)))
4987
4988 (defun gnus-thread-sort-by-chars (h1 h2)
4989   "Sort threads by root article octet length."
4990   (gnus-article-sort-by-chars
4991    (gnus-thread-header h1) (gnus-thread-header h2)))
4992
4993 (defsubst gnus-article-sort-by-author (h1 h2)
4994   "Sort articles by root author."
4995   (gnus-string<
4996    (let ((extract (funcall
4997                    gnus-extract-address-components
4998                    (mail-header-from h1))))
4999      (or (car extract) (cadr extract) ""))
5000    (let ((extract (funcall
5001                    gnus-extract-address-components
5002                    (mail-header-from h2))))
5003      (or (car extract) (cadr extract) ""))))
5004
5005 (defun gnus-thread-sort-by-author (h1 h2)
5006   "Sort threads by root author."
5007   (gnus-article-sort-by-author
5008    (gnus-thread-header h1)  (gnus-thread-header h2)))
5009
5010 (defsubst gnus-article-sort-by-recipient (h1 h2)
5011   "Sort articles by recipient."
5012   (gnus-string<
5013    (let ((extract (funcall
5014                    gnus-extract-address-components
5015                    (or (cdr (assq 'To (mail-header-extra h1))) ""))))
5016      (or (car extract) (cadr extract)))
5017    (let ((extract (funcall
5018                    gnus-extract-address-components
5019                    (or (cdr (assq 'To (mail-header-extra h2))) ""))))
5020      (or (car extract) (cadr extract)))))
5021
5022 (defun gnus-thread-sort-by-recipient (h1 h2)
5023   "Sort threads by root recipient."
5024   (gnus-article-sort-by-recipient
5025    (gnus-thread-header h1) (gnus-thread-header h2)))
5026
5027 (defsubst gnus-article-sort-by-subject (h1 h2)
5028   "Sort articles by root subject."
5029   (gnus-string<
5030    (downcase (gnus-simplify-subject-re (mail-header-subject h1)))
5031    (downcase (gnus-simplify-subject-re (mail-header-subject h2)))))
5032
5033 (defun gnus-thread-sort-by-subject (h1 h2)
5034   "Sort threads by root subject."
5035   (gnus-article-sort-by-subject
5036    (gnus-thread-header h1) (gnus-thread-header h2)))
5037
5038 (defsubst gnus-article-sort-by-date (h1 h2)
5039   "Sort articles by root article date."
5040   (time-less-p
5041    (gnus-date-get-time (mail-header-date h1))
5042    (gnus-date-get-time (mail-header-date h2))))
5043
5044 (defun gnus-thread-sort-by-date (h1 h2)
5045   "Sort threads by root article date."
5046   (gnus-article-sort-by-date
5047    (gnus-thread-header h1) (gnus-thread-header h2)))
5048
5049 (defsubst gnus-article-sort-by-score (h1 h2)
5050   "Sort articles by root article score.
5051 Unscored articles will be counted as having a score of zero."
5052   (> (or (cdr (assq (mail-header-number h1)
5053                     gnus-newsgroup-scored))
5054          gnus-summary-default-score 0)
5055      (or (cdr (assq (mail-header-number h2)
5056                     gnus-newsgroup-scored))
5057          gnus-summary-default-score 0)))
5058
5059 (defun gnus-thread-sort-by-score (h1 h2)
5060   "Sort threads by root article score."
5061   (gnus-article-sort-by-score
5062    (gnus-thread-header h1) (gnus-thread-header h2)))
5063
5064 (defun gnus-thread-sort-by-total-score (h1 h2)
5065   "Sort threads by the sum of all scores in the thread.
5066 Unscored articles will be counted as having a score of zero."
5067   (> (gnus-thread-total-score h1) (gnus-thread-total-score h2)))
5068
5069 (defun gnus-thread-total-score (thread)
5070   ;; This function find the total score of THREAD.
5071   (cond
5072    ((null thread)
5073     0)
5074    ((consp thread)
5075     (if (stringp (car thread))
5076         (apply gnus-thread-score-function 0
5077                (mapcar 'gnus-thread-total-score-1 (cdr thread)))
5078       (gnus-thread-total-score-1 thread)))
5079    (t
5080     (gnus-thread-total-score-1 (list thread)))))
5081
5082 (defun gnus-article-sort-by-most-recent-number (h1 h2)
5083   "Sort articles by number."
5084   (gnus-article-sort-by-number h1 h2))
5085
5086 (defun gnus-thread-sort-by-most-recent-number (h1 h2)
5087   "Sort threads such that the thread with the most recently arrived article comes first."
5088   (> (gnus-thread-highest-number h1) (gnus-thread-highest-number h2)))
5089
5090 (defun gnus-thread-highest-number (thread)
5091   "Return the highest article number in THREAD."
5092   (apply 'max (mapcar (lambda (header)
5093                         (mail-header-number header))
5094                       (message-flatten-list thread))))
5095
5096 (defun gnus-article-sort-by-most-recent-date (h1 h2)
5097   "Sort articles by number."
5098   (gnus-article-sort-by-date h1 h2))
5099
5100 (defun gnus-thread-sort-by-most-recent-date (h1 h2)
5101   "Sort threads such that the thread with the most recently dated article comes first."
5102   (> (gnus-thread-latest-date h1) (gnus-thread-latest-date h2)))
5103
5104 ; Since this is called not only to sort the top-level threads, but
5105 ; also in recursive sorts to order the articles within a thread, each
5106 ; article will be processed many times.  Thus it speeds things up
5107 ; quite a bit to use gnus-date-get-time, which caches the time value.
5108 (defun gnus-thread-latest-date (thread)
5109   "Return the highest article date in THREAD."
5110   (apply 'max
5111          (mapcar (lambda (header) (gnus-float-time
5112                                    (gnus-date-get-time
5113                                     (mail-header-date header))))
5114                  (message-flatten-list thread))))
5115
5116 (defun gnus-thread-total-score-1 (root)
5117   ;; This function find the total score of the thread below ROOT.
5118   (setq root (car root))
5119   (apply gnus-thread-score-function
5120          (or (append
5121               (mapcar 'gnus-thread-total-score
5122                       (cdr (gnus-id-to-thread (mail-header-id root))))
5123               (when (> (mail-header-number root) 0)
5124                 (list (or (cdr (assq (mail-header-number root)
5125                                      gnus-newsgroup-scored))
5126                           gnus-summary-default-score 0))))
5127              (list gnus-summary-default-score)
5128              '(0))))
5129
5130 ;; Added by Per Abrahamsen <amanda@iesd.auc.dk>.
5131 (defvar gnus-tmp-prev-subject nil)
5132 (defvar gnus-tmp-false-parent nil)
5133 (defvar gnus-tmp-root-expunged nil)
5134 (defvar gnus-tmp-dummy-line nil)
5135
5136 (defun gnus-extra-header (type &optional header)
5137   "Return the extra header of TYPE."
5138   (or (cdr (assq type (mail-header-extra (or header gnus-tmp-header))))
5139       ""))
5140
5141 (defvar gnus-tmp-thread-tree-header-string "")
5142
5143 (defcustom gnus-sum-thread-tree-root "> "
5144   "With %B spec, used for the root of a thread.
5145 If nil, use subject instead."
5146   :version "22.1"
5147   :type '(radio (const :format "%v  " nil) string)
5148   :group 'gnus-thread)
5149
5150 (defcustom gnus-sum-thread-tree-false-root "> "
5151   "With %B spec, used for a false root of a thread.
5152 If nil, use subject instead."
5153   :version "22.1"
5154   :type '(radio (const :format "%v  " nil) string)
5155   :group 'gnus-thread)
5156
5157 (defcustom gnus-sum-thread-tree-single-indent ""
5158   "With %B spec, used for a thread with just one message.
5159 If nil, use subject instead."
5160   :version "22.1"
5161   :type '(radio (const :format "%v  " nil) string)
5162   :group 'gnus-thread)
5163
5164 (defcustom gnus-sum-thread-tree-vertical "| "
5165   "With %B spec, used for drawing a vertical line."
5166   :version "22.1"
5167   :type 'string
5168   :group 'gnus-thread)
5169
5170 (defcustom gnus-sum-thread-tree-indent "  "
5171   "With %B spec, used for indenting."
5172   :version "22.1"
5173   :type 'string
5174   :group 'gnus-thread)
5175
5176 (defcustom gnus-sum-thread-tree-leaf-with-other "+-> "
5177   "With %B spec, used for a leaf with brothers."
5178   :version "22.1"
5179   :type 'string
5180   :group 'gnus-thread)
5181
5182 (defcustom gnus-sum-thread-tree-single-leaf "\\-> "
5183   "With %B spec, used for a leaf without brothers."
5184   :version "22.1"
5185   :type 'string
5186   :group 'gnus-thread)
5187
5188 (defcustom gnus-summary-display-while-building nil
5189   "If non-nil, show and update the summary buffer as it's being built.
5190 If the value is t, update the buffer after every line is inserted.  If
5191 the value is an integer (N), update the display every N lines."
5192   :version "22.1"
5193   :group 'gnus-thread
5194   :type '(choice (const :tag "off" nil)
5195                  number
5196                  (const :tag "frequently" t)))
5197
5198 (defun gnus-summary-prepare-threads (threads)
5199   "Prepare summary buffer from THREADS and indentation LEVEL.
5200 THREADS is either a list of `(PARENT [(CHILD1 [(GRANDCHILD ...]...) ...])'
5201 or a straight list of headers."
5202   (gnus-message 7 "Generating summary...")
5203
5204   (setq gnus-newsgroup-threads threads)
5205   (beginning-of-line)
5206
5207   (let ((gnus-tmp-level 0)
5208         (default-score (or gnus-summary-default-score 0))
5209         (gnus-visual-p (gnus-visual-p 'summary-highlight 'highlight))
5210         (building-line-count gnus-summary-display-while-building)
5211         (building-count (integerp gnus-summary-display-while-building))
5212         thread number subject stack state gnus-tmp-gathered beg-match
5213         new-roots gnus-tmp-new-adopts thread-end simp-subject
5214         gnus-tmp-header gnus-tmp-unread gnus-tmp-downloaded
5215         gnus-tmp-replied gnus-tmp-subject-or-nil
5216         gnus-tmp-dummy gnus-tmp-indentation gnus-tmp-lines gnus-tmp-score
5217         gnus-tmp-score-char gnus-tmp-from gnus-tmp-name
5218         gnus-tmp-number gnus-tmp-opening-bracket gnus-tmp-closing-bracket
5219         tree-stack)
5220
5221     (setq gnus-tmp-prev-subject nil
5222           gnus-tmp-thread-tree-header-string "")
5223
5224     (if (vectorp (car threads))
5225         ;; If this is a straight (sic) list of headers, then a
5226         ;; threaded summary display isn't required, so we just create
5227         ;; an unthreaded one.
5228         (gnus-summary-prepare-unthreaded threads)
5229
5230       ;; Do the threaded display.
5231
5232       (if gnus-summary-display-while-building
5233           (switch-to-buffer (buffer-name)))
5234       (while (or threads stack gnus-tmp-new-adopts new-roots)
5235
5236         (if (and (= gnus-tmp-level 0)
5237                  (or (not stack)
5238                      (= (caar stack) 0))
5239                  (not gnus-tmp-false-parent)
5240                  (or gnus-tmp-new-adopts new-roots))
5241             (if gnus-tmp-new-adopts
5242                 (setq gnus-tmp-level (if gnus-tmp-root-expunged 0 1)
5243                       thread (list (car gnus-tmp-new-adopts))
5244                       gnus-tmp-header (caar thread)
5245                       gnus-tmp-new-adopts (cdr gnus-tmp-new-adopts))
5246               (when new-roots
5247                 (setq thread (list (car new-roots))
5248                       gnus-tmp-header (caar thread)
5249                       new-roots (cdr new-roots))))
5250
5251           (if threads
5252               ;; If there are some threads, we do them before the
5253               ;; threads on the stack.
5254               (setq thread threads
5255                     gnus-tmp-header (caar thread))
5256             ;; There were no current threads, so we pop something off
5257             ;; the stack.
5258             (setq state (car stack)
5259                   gnus-tmp-level (car state)
5260                   tree-stack (cadr state)
5261                   thread (caddr state)
5262                   stack (cdr stack)
5263                   gnus-tmp-header (caar thread))))
5264
5265         (setq gnus-tmp-false-parent nil)
5266         (setq gnus-tmp-root-expunged nil)
5267         (setq thread-end nil)
5268
5269         (if (stringp gnus-tmp-header)
5270             ;; The header is a dummy root.
5271             (cond
5272              ((eq gnus-summary-make-false-root 'adopt)
5273               ;; We let the first article adopt the rest.
5274               (setq gnus-tmp-new-adopts (nconc gnus-tmp-new-adopts
5275                                                (cddar thread)))
5276               (setq gnus-tmp-gathered
5277                     (nconc (mapcar
5278                             (lambda (h) (mail-header-number (car h)))
5279                             (cddar thread))
5280                            gnus-tmp-gathered))
5281               (setq thread (cons (list (caar thread)
5282                                        (cadar thread))
5283                                  (cdr thread)))
5284               (setq gnus-tmp-level -1
5285                     gnus-tmp-false-parent t))
5286              ((eq gnus-summary-make-false-root 'empty)
5287               ;; We print adopted articles with empty subject fields.
5288               (setq gnus-tmp-gathered
5289                     (nconc (mapcar
5290                             (lambda (h) (mail-header-number (car h)))
5291                             (cddar thread))
5292                            gnus-tmp-gathered))
5293               (setq gnus-tmp-level -1))
5294              ((eq gnus-summary-make-false-root 'dummy)
5295               ;; We remember that we probably want to output a dummy
5296               ;; root.
5297               (setq gnus-tmp-dummy-line gnus-tmp-header)
5298               (setq gnus-tmp-prev-subject gnus-tmp-header))
5299              (t
5300               ;; We do not make a root for the gathered
5301               ;; sub-threads at all.
5302               (setq gnus-tmp-level -1)))
5303
5304           (setq number (mail-header-number gnus-tmp-header)
5305                 subject (mail-header-subject gnus-tmp-header)
5306                 simp-subject (gnus-simplify-subject-fully subject))
5307
5308           (cond
5309            ;; If the thread has changed subject, we might want to make
5310            ;; this subthread into a root.
5311            ((and (null gnus-thread-ignore-subject)
5312                  (not (zerop gnus-tmp-level))
5313                  gnus-tmp-prev-subject
5314                  (not (string= gnus-tmp-prev-subject simp-subject)))
5315             (setq new-roots (nconc new-roots (list (car thread)))
5316                   thread-end t
5317                   gnus-tmp-header nil))
5318            ;; If the article lies outside the current limit,
5319            ;; then we do not display it.
5320            ((not (memq number gnus-newsgroup-limit))
5321             (setq gnus-tmp-gathered
5322                   (nconc (mapcar
5323                           (lambda (h) (mail-header-number (car h)))
5324                           (cdar thread))
5325                          gnus-tmp-gathered))
5326             (setq gnus-tmp-new-adopts (if (cdar thread)
5327                                           (append gnus-tmp-new-adopts
5328                                                   (cdar thread))
5329                                         gnus-tmp-new-adopts)
5330                   thread-end t
5331                   gnus-tmp-header nil)
5332             (when (zerop gnus-tmp-level)
5333               (setq gnus-tmp-root-expunged t)))
5334            ;; Perhaps this article is to be marked as read?
5335            ((and gnus-summary-mark-below
5336                  (< (or (cdr (assq number gnus-newsgroup-scored))
5337                         default-score)
5338                     gnus-summary-mark-below)
5339                  ;; Don't touch sparse articles.
5340                  (not (gnus-summary-article-sparse-p number))
5341                  (not (gnus-summary-article-ancient-p number)))
5342             (setq gnus-newsgroup-unreads
5343                   (delq number gnus-newsgroup-unreads))
5344             (if gnus-newsgroup-auto-expire
5345                 (setq gnus-newsgroup-expirable
5346                       (gnus-add-to-sorted-list
5347                        gnus-newsgroup-expirable number))
5348               (push (cons number gnus-low-score-mark)
5349                     gnus-newsgroup-reads))))
5350
5351           (when gnus-tmp-header
5352             ;; We may have an old dummy line to output before this
5353             ;; article.
5354             (when (and gnus-tmp-dummy-line
5355                        (gnus-subject-equal
5356                         gnus-tmp-dummy-line
5357                         (mail-header-subject gnus-tmp-header)))
5358               (gnus-summary-insert-dummy-line
5359                gnus-tmp-dummy-line (mail-header-number gnus-tmp-header))
5360               (setq gnus-tmp-dummy-line nil))
5361
5362             ;; Compute the mark.
5363             (setq gnus-tmp-unread (gnus-article-mark number))
5364
5365             (push (gnus-data-make number gnus-tmp-unread (1+ (point))
5366                                   gnus-tmp-header gnus-tmp-level)
5367                   gnus-newsgroup-data)
5368
5369             ;; Actually insert the line.
5370             (setq
5371              gnus-tmp-subject-or-nil
5372              (cond
5373               ((and gnus-thread-ignore-subject
5374                     gnus-tmp-prev-subject
5375                     (not (string= gnus-tmp-prev-subject simp-subject)))
5376                subject)
5377               ((zerop gnus-tmp-level)
5378                (if (and (eq gnus-summary-make-false-root 'empty)
5379                         (memq number gnus-tmp-gathered)
5380                         gnus-tmp-prev-subject
5381                         (string= gnus-tmp-prev-subject simp-subject))
5382                    gnus-summary-same-subject
5383                  subject))
5384               (t gnus-summary-same-subject)))
5385             (if (and (eq gnus-summary-make-false-root 'adopt)
5386                      (= gnus-tmp-level 1)
5387                      (memq number gnus-tmp-gathered))
5388                 (setq gnus-tmp-opening-bracket ?\<
5389                       gnus-tmp-closing-bracket ?\>)
5390               (setq gnus-tmp-opening-bracket ?\[
5391                     gnus-tmp-closing-bracket ?\]))
5392             (if (>= gnus-tmp-level (length gnus-thread-indent-array))
5393                 (gnus-make-thread-indent-array
5394                  (max (* 2 (length gnus-thread-indent-array))
5395                       gnus-tmp-level)))
5396             (setq
5397              gnus-tmp-indentation
5398              (aref gnus-thread-indent-array gnus-tmp-level)
5399              gnus-tmp-lines (mail-header-lines gnus-tmp-header)
5400              gnus-tmp-score (or (cdr (assq number gnus-newsgroup-scored))
5401                                 gnus-summary-default-score 0)
5402              gnus-tmp-score-char
5403              (if (or (null gnus-summary-default-score)
5404                      (<= (abs (- gnus-tmp-score gnus-summary-default-score))
5405                          gnus-summary-zcore-fuzz))
5406                  ?                      ;Whitespace
5407                (if (< gnus-tmp-score gnus-summary-default-score)
5408                    gnus-score-below-mark gnus-score-over-mark))
5409              gnus-tmp-replied
5410              (cond ((memq number gnus-newsgroup-processable)
5411                     gnus-process-mark)
5412                    ((memq number gnus-newsgroup-cached)
5413                     gnus-cached-mark)
5414                    ((memq number gnus-newsgroup-replied)
5415                     gnus-replied-mark)
5416                    ((memq number gnus-newsgroup-forwarded)
5417                     gnus-forwarded-mark)
5418                    ((memq number gnus-newsgroup-saved)
5419                     gnus-saved-mark)
5420                    ((memq number gnus-newsgroup-unseen)
5421                     gnus-unseen-mark)
5422                    (t gnus-no-mark))
5423              gnus-tmp-downloaded
5424              (cond ((memq number gnus-newsgroup-undownloaded)
5425                     gnus-undownloaded-mark)
5426                    (gnus-newsgroup-agentized
5427                     gnus-downloaded-mark)
5428                    (t
5429                     gnus-no-mark))
5430              gnus-tmp-from (mail-header-from gnus-tmp-header)
5431              gnus-tmp-name
5432              (cond
5433               ((string-match "<[^>]+> *$" gnus-tmp-from)
5434                (setq beg-match (match-beginning 0))
5435                (or (and (string-match "^\".+\"" gnus-tmp-from)
5436                         (substring gnus-tmp-from 1 (1- (match-end 0))))
5437                    (substring gnus-tmp-from 0 beg-match)))
5438               ((string-match "(.+)" gnus-tmp-from)
5439                (substring gnus-tmp-from
5440                           (1+ (match-beginning 0)) (1- (match-end 0))))
5441               (t gnus-tmp-from))
5442
5443              ;; Do the %B string
5444              gnus-tmp-thread-tree-header-string
5445              (cond
5446               ((not gnus-show-threads) "")
5447               ((zerop gnus-tmp-level)
5448                (cond ((cdar thread)
5449                       (or gnus-sum-thread-tree-root subject))
5450                      (gnus-tmp-new-adopts
5451                       (or gnus-sum-thread-tree-false-root subject))
5452                      (t
5453                       (or gnus-sum-thread-tree-single-indent subject))))
5454               (t
5455                (concat (apply 'concat
5456                               (mapcar (lambda (item)
5457                                         (if (= item 1)
5458                                             gnus-sum-thread-tree-vertical
5459                                           gnus-sum-thread-tree-indent))
5460                                       (cdr (reverse tree-stack))))
5461                        (if (nth 1 thread)
5462                            gnus-sum-thread-tree-leaf-with-other
5463                          gnus-sum-thread-tree-single-leaf)))))
5464             (when (string= gnus-tmp-name "")
5465               (setq gnus-tmp-name gnus-tmp-from))
5466             (unless (numberp gnus-tmp-lines)
5467               (setq gnus-tmp-lines -1))
5468             (if (= gnus-tmp-lines -1)
5469                 (setq gnus-tmp-lines "?")
5470               (setq gnus-tmp-lines (number-to-string gnus-tmp-lines)))
5471             (gnus-put-text-property
5472              (point)
5473              (progn (eval gnus-summary-line-format-spec) (point))
5474              'gnus-number number)
5475             (when gnus-visual-p
5476               (forward-line -1)
5477               (gnus-summary-highlight-line)
5478               (when gnus-summary-update-hook
5479                 (gnus-run-hooks 'gnus-summary-update-hook))
5480               (forward-line 1))
5481
5482             (setq gnus-tmp-prev-subject simp-subject)))
5483
5484         (when (nth 1 thread)
5485           (push (list (max 0 gnus-tmp-level)
5486                       (copy-sequence tree-stack)
5487                       (nthcdr 1 thread))
5488                 stack))
5489         (push (if (nth 1 thread) 1 0) tree-stack)
5490         (incf gnus-tmp-level)
5491         (setq threads (if thread-end nil (cdar thread)))
5492         (if gnus-summary-display-while-building
5493             (if building-count
5494                 (progn
5495                   ;; use a set frequency
5496                   (setq building-line-count (1- building-line-count))
5497                   (when (= building-line-count 0)
5498                     (sit-for 0)
5499                     (setq building-line-count
5500                           gnus-summary-display-while-building)))
5501               ;; always
5502               (sit-for 0)))
5503         (unless threads
5504           (setq gnus-tmp-level 0)))))
5505   (gnus-message 7 "Generating summary...done"))
5506
5507 (defun gnus-summary-prepare-unthreaded (headers)
5508   "Generate an unthreaded summary buffer based on HEADERS."
5509   (let (header number mark)
5510
5511     (beginning-of-line)
5512
5513     (while headers
5514       ;; We may have to root out some bad articles...
5515       (when (memq (setq number (mail-header-number
5516                                 (setq header (pop headers))))
5517                   gnus-newsgroup-limit)
5518         ;; Mark article as read when it has a low score.
5519         (when (and gnus-summary-mark-below
5520                    (< (or (cdr (assq number gnus-newsgroup-scored))
5521                           gnus-summary-default-score 0)
5522                       gnus-summary-mark-below)
5523                    (not (gnus-summary-article-ancient-p number)))
5524           (setq gnus-newsgroup-unreads
5525                 (delq number gnus-newsgroup-unreads))
5526           (if gnus-newsgroup-auto-expire
5527               (push number gnus-newsgroup-expirable)
5528             (push (cons number gnus-low-score-mark)
5529                   gnus-newsgroup-reads)))
5530
5531         (setq mark (gnus-article-mark number))
5532         (push (gnus-data-make number mark (1+ (point)) header 0)
5533               gnus-newsgroup-data)
5534         (gnus-summary-insert-line
5535          header 0 number
5536          (memq number gnus-newsgroup-undownloaded)
5537          mark (memq number gnus-newsgroup-replied)
5538          (memq number gnus-newsgroup-expirable)
5539          (mail-header-subject header) nil
5540          (cdr (assq number gnus-newsgroup-scored))
5541          (memq number gnus-newsgroup-processable))))))
5542
5543 (declare-function gnus-parameter-list-identifier "gnus-art" (name) t)
5544
5545 (defun gnus-group-get-list-identifiers (group)
5546   "Get list identifier regexp for GROUP."
5547   (or (gnus-parameter-list-identifier group)
5548       (if (consp gnus-list-identifiers)
5549           (mapconcat 'identity gnus-list-identifiers " *\\|")
5550         gnus-list-identifiers)))
5551
5552 (defun gnus-summary-remove-list-identifiers ()
5553   "Remove list identifiers in `gnus-list-identifiers' from articles in the current group."
5554   (let ((regexp (gnus-group-get-list-identifiers gnus-newsgroup-name))
5555         changed subject)
5556     (when regexp
5557       (setq regexp (concat "^\\(?:R[Ee]: +\\)*\\(" regexp " *\\)"))
5558       (dolist (header gnus-newsgroup-headers)
5559         (setq subject (mail-header-subject header)
5560               changed nil)
5561         (while (string-match regexp subject)
5562           (setq subject
5563                 (concat (substring subject 0 (match-beginning 1))
5564                         (substring subject (match-end 0)))
5565                 changed t))
5566         (when changed
5567           (when (string-match "^\\(\\(?:R[Ee]: +\\)+\\)R[Ee]: +" subject)
5568             (setq subject
5569                   (concat (substring subject 0 (match-beginning 1))
5570                           (substring subject (match-end 1)))))
5571           (mail-header-set-subject header subject))))))
5572
5573 (defun gnus-fetch-headers (articles &optional limit force-new dependencies)
5574   "Fetch headers of ARTICLES."
5575   (let ((name (gnus-group-decoded-name gnus-newsgroup-name)))
5576     (gnus-message 7 "Fetching headers for %s..." name)
5577     (prog1
5578         (if (eq 'nov
5579                 (setq gnus-headers-retrieved-by
5580                       (gnus-retrieve-headers
5581                        articles gnus-newsgroup-name
5582                        (or limit
5583                            ;; We might want to fetch old headers, but
5584                            ;; not if there is only 1 article.
5585                            (and (or (and
5586                                      (not (eq gnus-fetch-old-headers 'some))
5587                                      (not (numberp gnus-fetch-old-headers)))
5588                                     (> (length articles) 1))
5589                                 gnus-fetch-old-headers)))))
5590             (gnus-get-newsgroup-headers-xover
5591              articles force-new dependencies gnus-newsgroup-name t)
5592           (gnus-get-newsgroup-headers dependencies force-new))
5593       (gnus-message 7 "Fetching headers for %s...done" name))))
5594
5595 (defun gnus-select-newsgroup (group &optional read-all select-articles)
5596   "Select newsgroup GROUP.
5597 If READ-ALL is non-nil, all articles in the group are selected.
5598 If SELECT-ARTICLES, only select those articles from GROUP."
5599   (let* ((entry (gnus-group-entry group))
5600          ;;!!! Dirty hack; should be removed.
5601          (gnus-summary-ignore-duplicates
5602           (if (eq (car (gnus-find-method-for-group group)) 'nnvirtual)
5603               t
5604             gnus-summary-ignore-duplicates))
5605          (info (nth 2 entry))
5606          charset articles fetched-articles cached)
5607
5608     (unless (gnus-check-server
5609              (set (make-local-variable 'gnus-current-select-method)
5610                   (gnus-find-method-for-group group)))
5611       (error "Couldn't open server"))
5612     (setq charset (gnus-group-name-charset gnus-current-select-method group))
5613
5614     (or (and entry (not (eq (car entry) t))) ; Either it's active...
5615         (gnus-activate-group group)     ; Or we can activate it...
5616         (progn                          ; Or we bug out.
5617           (when (derived-mode-p 'gnus-summary-mode)
5618             (gnus-kill-buffer (current-buffer)))
5619           (error
5620            "Couldn't activate group %s: %s"
5621            (mm-decode-coding-string group charset)
5622            (mm-decode-coding-string (gnus-status-message group) charset))))
5623
5624     (unless (gnus-request-group group t nil (gnus-get-info group))
5625       (when (derived-mode-p 'gnus-summary-mode)
5626         (gnus-kill-buffer (current-buffer)))
5627       (error "Couldn't request group %s: %s"
5628              (mm-decode-coding-string group charset)
5629              (mm-decode-coding-string (gnus-status-message group) charset)))
5630
5631     (when (and gnus-agent
5632                (gnus-active group))
5633       (gnus-agent-possibly-alter-active group (gnus-active group) info)
5634
5635       (setq gnus-summary-use-undownloaded-faces
5636             (gnus-agent-find-parameter
5637              group
5638              'agent-enable-undownloaded-faces)))
5639
5640     (setq gnus-newsgroup-name group
5641           gnus-newsgroup-unselected nil
5642           gnus-newsgroup-unreads (gnus-list-of-unread-articles group))
5643
5644     (let ((display (gnus-group-find-parameter group 'display)))
5645       (setq gnus-newsgroup-display
5646             (cond
5647              ((not (zerop (or (car-safe read-all) 0)))
5648               ;; The user entered the group with C-u SPC/RET, let's show
5649               ;; all articles.
5650               'gnus-not-ignore)
5651              ((eq display 'all)
5652               'gnus-not-ignore)
5653              ((arrayp display)
5654               (gnus-summary-display-make-predicate (mapcar 'identity display)))
5655              ((numberp display)
5656               ;; The following is probably the "correct" solution, but
5657               ;; it makes Gnus fetch all headers and then limit the
5658               ;; articles (which is slow), so instead we hack the
5659               ;; select-articles parameter instead. -- Simon Josefsson
5660               ;; <jas@kth.se>
5661               ;;
5662               ;; (gnus-byte-compile
5663               ;;  `(lambda () (> number ,(- (cdr (gnus-active group))
5664               ;;                         display)))))
5665               (setq select-articles
5666                     (gnus-uncompress-range
5667                      (cons (let ((tmp (- (cdr (gnus-active group)) display)))
5668                              (if (> tmp 0)
5669                                  tmp
5670                                1))
5671                            (cdr (gnus-active group)))))
5672               nil)
5673              (t
5674               nil))))
5675
5676     (gnus-summary-setup-default-charset)
5677
5678     ;; Kludge to avoid having cached articles nixed out in virtual groups.
5679     (when (gnus-virtual-group-p group)
5680       (setq cached gnus-newsgroup-cached))
5681
5682     (setq gnus-newsgroup-unreads
5683           (gnus-sorted-ndifference
5684            (gnus-sorted-ndifference gnus-newsgroup-unreads
5685                                     gnus-newsgroup-marked)
5686            gnus-newsgroup-dormant))
5687
5688     (setq gnus-newsgroup-processable nil)
5689
5690     (gnus-update-read-articles group gnus-newsgroup-unreads t)
5691
5692     ;; Adjust and set lists of article marks.
5693     (when info
5694       (gnus-adjust-marked-articles info))
5695     (if (setq articles select-articles)
5696         (setq gnus-newsgroup-unselected
5697               (gnus-sorted-difference gnus-newsgroup-unreads articles))
5698       (setq articles (gnus-articles-to-read group read-all)))
5699
5700     (cond
5701      ((null articles)
5702       ;;(gnus-message 3 "Couldn't select newsgroup -- no articles to display")
5703       'quit)
5704      ((eq articles 0) nil)
5705      (t
5706       ;; Init the dependencies hash table.
5707       (setq gnus-newsgroup-dependencies
5708             (gnus-make-hashtable (length articles)))
5709       (if (gnus-buffer-live-p gnus-group-buffer)
5710           (gnus-set-global-variables)
5711         (set-default 'gnus-newsgroup-name gnus-newsgroup-name))
5712       ;; Retrieve the headers and read them in.
5713
5714       (setq gnus-newsgroup-headers (gnus-fetch-headers articles))
5715
5716       ;; Kludge to avoid having cached articles nixed out in virtual groups.
5717       (when cached
5718         (setq gnus-newsgroup-cached cached))
5719
5720       ;; Suppress duplicates?
5721       (when gnus-suppress-duplicates
5722         (gnus-dup-suppress-articles))
5723
5724       ;; Set the initial limit.
5725       (setq gnus-newsgroup-limit (copy-sequence articles))
5726       ;; Remove canceled articles from the list of unread articles.
5727       (setq fetched-articles
5728             (mapcar (lambda (headers) (mail-header-number headers))
5729                     gnus-newsgroup-headers))
5730       (setq gnus-newsgroup-articles fetched-articles)
5731       (setq gnus-newsgroup-unreads
5732             (gnus-sorted-nintersection
5733              gnus-newsgroup-unreads fetched-articles))
5734       (gnus-compute-unseen-list)
5735
5736       ;; Removed marked articles that do not exist.
5737       (gnus-update-missing-marks
5738        (gnus-sorted-difference articles fetched-articles))
5739       ;; We might want to build some more threads first.
5740       (when (and gnus-fetch-old-headers
5741                  (eq gnus-headers-retrieved-by 'nov))
5742         (if (eq gnus-fetch-old-headers 'invisible)
5743             (gnus-build-all-threads)
5744           (gnus-build-old-threads)))
5745       ;; Let the Gnus agent mark articles as read.
5746       (when gnus-agent
5747         (gnus-agent-get-undownloaded-list))
5748       ;; Remove list identifiers from subject
5749       (gnus-summary-remove-list-identifiers)
5750       ;; Check whether auto-expire is to be done in this group.
5751       (setq gnus-newsgroup-auto-expire
5752             (and (gnus-group-auto-expirable-p group)
5753                  (not (gnus-group-read-only-p group))))
5754       ;; Set up the article buffer now, if necessary.
5755       (unless (and gnus-single-article-buffer
5756                    (equal gnus-article-buffer "*Article*"))
5757         (gnus-article-setup-buffer))
5758       ;; First and last article in this newsgroup.
5759       (when gnus-newsgroup-headers
5760         (setq gnus-newsgroup-begin
5761               (mail-header-number (car gnus-newsgroup-headers))
5762               gnus-newsgroup-end
5763               (mail-header-number
5764                (gnus-last-element gnus-newsgroup-headers))))
5765       ;; GROUP is successfully selected.
5766       (or gnus-newsgroup-headers t)))))
5767
5768 (defun gnus-compute-unseen-list ()
5769   ;; The `seen' marks are treated specially.
5770   (if (not gnus-newsgroup-seen)
5771       (setq gnus-newsgroup-unseen gnus-newsgroup-articles)
5772     (setq gnus-newsgroup-unseen
5773           (gnus-inverse-list-range-intersection
5774            gnus-newsgroup-articles gnus-newsgroup-seen))))
5775
5776 (declare-function gnus-get-predicate "gnus-agent" (predicate))
5777
5778 (defun gnus-summary-display-make-predicate (display)
5779   (require 'gnus-agent)
5780   (when (= (length display) 1)
5781     (setq display (car display)))
5782   (unless gnus-summary-display-cache
5783     (dolist (elem (append '((unread . unread)
5784                             (read . read)
5785                             (unseen . unseen))
5786                           gnus-article-mark-lists))
5787       (push (cons (cdr elem)
5788                   (gnus-byte-compile    ;Why bother?
5789                    `(lambda () (gnus-article-marked-p ',(cdr elem)))))
5790             gnus-summary-display-cache)))
5791   (let ((gnus-category-predicate-alist gnus-summary-display-cache)
5792         (gnus-category-predicate-cache gnus-summary-display-cache))
5793     (gnus-get-predicate display)))
5794
5795 ;; Uses the dynamically bound `gnus-number' variable.
5796 (defvar gnus-number)
5797 (defun gnus-article-marked-p (type &optional article)
5798   (let ((article (or article gnus-number)))
5799     (cond
5800      ((eq type 'tick)
5801       (memq article gnus-newsgroup-marked))
5802      ((eq type 'spam)
5803       (memq article gnus-newsgroup-spam-marked))
5804      ((eq type 'unsend)
5805       (memq article gnus-newsgroup-unsendable))
5806      ((eq type 'undownload)
5807       (memq article gnus-newsgroup-undownloaded))
5808      ((eq type 'download)
5809       (memq article gnus-newsgroup-downloadable))
5810      ((eq type 'unread)
5811       (memq article gnus-newsgroup-unreads))
5812      ((eq type 'read)
5813       (memq article gnus-newsgroup-reads))
5814      ((eq type 'dormant)
5815       (memq article gnus-newsgroup-dormant) )
5816      ((eq type 'expire)
5817       (memq article gnus-newsgroup-expirable))
5818      ((eq type 'reply)
5819       (memq article gnus-newsgroup-replied))
5820      ((eq type 'killed)
5821       (memq article gnus-newsgroup-killed))
5822      ((eq type 'bookmark)
5823       (assq article gnus-newsgroup-bookmarks))
5824      ((eq type 'score)
5825       (assq article gnus-newsgroup-scored))
5826      ((eq type 'save)
5827       (memq article gnus-newsgroup-saved))
5828      ((eq type 'cache)
5829       (memq article gnus-newsgroup-cached))
5830      ((eq type 'forward)
5831       (memq article gnus-newsgroup-forwarded))
5832      ((eq type 'seen)
5833       (not (memq article gnus-newsgroup-unseen)))
5834      (t t))))
5835
5836 (defun gnus-articles-to-read (group &optional read-all)
5837   "Find out what articles the user wants to read."
5838   (let* ((only-read-p t)
5839          (articles
5840           (gnus-list-range-difference
5841           ;; Select all articles if `read-all' is non-nil, or if there
5842           ;; are no unread articles.
5843           (if (or read-all
5844                   (and (zerop (length gnus-newsgroup-marked))
5845                        (zerop (length gnus-newsgroup-unreads)))
5846                   ;; Fetch all if the predicate is non-nil.
5847                   gnus-newsgroup-display)
5848               ;; We want to select the headers for all the articles in
5849               ;; the group, so we select either all the active
5850               ;; articles in the group, or (if that's nil), the
5851               ;; articles in the cache.
5852               (or
5853                (if gnus-newsgroup-maximum-articles
5854                    (let ((active (gnus-active group)))
5855                      (gnus-uncompress-range
5856                       (cons (max (car active)
5857                                  (- (cdr active)
5858                                     gnus-newsgroup-maximum-articles
5859                                     -1))
5860                             (cdr active))))
5861                  (gnus-uncompress-range (gnus-active group)))
5862                (gnus-cache-articles-in-group group))
5863             ;; Select only the "normal" subset of articles.
5864             (setq only-read-p nil)
5865             (gnus-sorted-nunion
5866              (gnus-sorted-union gnus-newsgroup-dormant gnus-newsgroup-marked)
5867              gnus-newsgroup-unreads))
5868           (cdr (assq 'unexist (gnus-info-marks (gnus-get-info group))))))
5869          (scored-list (gnus-killed-articles gnus-newsgroup-killed articles))
5870          (scored (length scored-list))
5871          (number (length articles))
5872          (marked (+ (length gnus-newsgroup-marked)
5873                     (length gnus-newsgroup-dormant)))
5874          (select
5875           (cond
5876            ((numberp read-all)
5877             read-all)
5878            ((numberp gnus-newsgroup-display)
5879             gnus-newsgroup-display)
5880            (t
5881             (condition-case ()
5882                 (cond
5883                  ((and (or (<= scored marked) (= scored number))
5884                        (numberp gnus-large-newsgroup)
5885                        (> number gnus-large-newsgroup))
5886                   (let* ((cursor-in-echo-area nil)
5887                          (initial (gnus-parameter-large-newsgroup-initial
5888                                    gnus-newsgroup-name))
5889                          (default (if only-read-p
5890                                       (or initial gnus-large-newsgroup)
5891                                     number))
5892                          (input
5893                           (read-string
5894                            (if only-read-p
5895                                (format
5896                                 "How many articles from %s (available %d, default %d): "
5897                                 (gnus-group-decoded-name
5898                                  (gnus-group-real-name gnus-newsgroup-name))
5899                                 number default)
5900                              (format
5901                               "How many articles from %s (%d default): "
5902                               (gnus-group-decoded-name
5903                                (gnus-group-real-name gnus-newsgroup-name))
5904                               default))
5905                            nil
5906                            nil
5907                            (number-to-string default))))
5908                     (if (string-match "^[ \t]*$" input) number input)))
5909                  ((and (> scored marked) (< scored number)
5910                        (> (- scored number) 20))
5911                   (let ((input
5912                          (read-string
5913                           (format "%s %s (%d scored, %d total): "
5914                                   "How many articles from"
5915                                   (gnus-group-decoded-name
5916                                    (gnus-group-real-name gnus-newsgroup-name))
5917                                   scored number))))
5918                     (if (string-match "^[ \t]*$" input)
5919                         number input)))
5920                  (t number))
5921               (quit
5922                (message "Quit getting the articles to read")
5923                nil))))))
5924     (setq select (if (stringp select) (string-to-number select) select))
5925     (if (or (null select) (zerop select))
5926         select
5927       (if (and (not (zerop scored)) (<= (abs select) scored))
5928           (progn
5929             (setq articles (sort scored-list '<))
5930             (setq number (length articles)))
5931         (setq articles (copy-sequence articles)))
5932
5933       (when (< (abs select) number)
5934         (if (< select 0)
5935             ;; Select the N oldest articles.
5936             (setcdr (nthcdr (1- (abs select)) articles) nil)
5937           ;; Select the N most recent articles.
5938           (setq articles (nthcdr (- number select) articles))))
5939       (setq gnus-newsgroup-unselected
5940             (gnus-sorted-difference gnus-newsgroup-unreads articles))
5941       (when gnus-alter-articles-to-read-function
5942         (setq articles
5943               (sort
5944                (funcall gnus-alter-articles-to-read-function
5945                         gnus-newsgroup-name articles)
5946                '<)))
5947       articles)))
5948
5949 (defun gnus-killed-articles (killed articles)
5950   (let (out)
5951     (while articles
5952       (when (inline (gnus-member-of-range (car articles) killed))
5953         (push (car articles) out))
5954       (setq articles (cdr articles)))
5955     out))
5956
5957 (defun gnus-article-mark-to-type (mark)
5958   "Return the type of MARK."
5959   (or (cadr (assq mark gnus-article-special-mark-lists))
5960       'list))
5961
5962 (defun gnus-article-unpropagatable-p (mark)
5963   "Return whether MARK should be propagated to back end."
5964   (memq mark gnus-article-unpropagated-mark-lists))
5965
5966 (defun gnus-adjust-marked-articles (info)
5967   "Set all article lists and remove all marks that are no longer valid."
5968   (let* ((marked-lists (gnus-info-marks info))
5969          (active (gnus-active (gnus-info-group info)))
5970          (min (car active))
5971          (max (cdr active))
5972          (types gnus-article-mark-lists)
5973          marks var articles article mark mark-type
5974          bgn end)
5975     ;; Hack to avoid adjusting marks for imap.
5976     (when (eq (car (gnus-find-method-for-group (gnus-info-group info)))
5977               'nnimap)
5978       (setq min 1))
5979
5980     (dolist (marks marked-lists)
5981       (setq mark (car marks)
5982             mark-type (gnus-article-mark-to-type mark)
5983             var (intern (format "gnus-newsgroup-%s" (car (rassq mark types)))))
5984       ;; We set the variable according to the type of the marks list,
5985       ;; and then adjust the marks to a subset of the active articles.
5986       (cond
5987        ;; Adjust "simple" lists - compressed yet unsorted
5988        ((eq mark-type 'list)
5989         ;; Simultaneously uncompress and clip to active range
5990         ;; See gnus-uncompress-range for a description of possible marks
5991         (let (l lh)
5992           (if (not (cadr marks))
5993               (set var nil)
5994             (setq articles (if (numberp (cddr marks))
5995                                (list (cdr marks))
5996                              (cdr marks))
5997                   lh (cons nil nil)
5998                   l lh)
5999
6000             (while (setq article (pop articles))
6001               (cond ((consp article)
6002                      (setq bgn (max (car article) min)
6003                            end (min (cdr article) max))
6004                      (while (<= bgn end)
6005                        (setq l (setcdr l (cons bgn nil))
6006                              bgn (1+ bgn))))
6007                     ((and (<= min article)
6008                           (>= max article))
6009                      (setq l (setcdr l (cons article nil))))))
6010             (set var (cdr lh)))))
6011        ;; Adjust assocs.
6012        ((eq mark-type 'tuple)
6013         (set var (setq articles (cdr marks)))
6014         (when (not (listp (cdr (symbol-value var))))
6015           (set var (list (symbol-value var))))
6016         (when (not (listp (cdr articles)))
6017           (setq articles (list articles)))
6018         (while articles
6019           (when (or (not (consp (setq article (pop articles))))
6020                     (< (car article) min)
6021                     (> (car article) max))
6022             (set var (delq article (symbol-value var))))))
6023        ;; Adjust ranges (sloppily).
6024        ((eq mark-type 'range)
6025         (cond
6026          ((eq mark 'seen)
6027           ;; Fix the record for `seen' if it looks like (seen NUM1 . NUM2).
6028           ;; It should be (seen (NUM1 . NUM2)).
6029           (when (numberp (cddr marks))
6030             (setcdr marks (list (cdr marks))))
6031           (setq articles (cdr marks))
6032           (while (and articles
6033                       (or (and (consp (car articles))
6034                                (> min (cdar articles)))
6035                           (and (numberp (car articles))
6036                                (> min (car articles)))))
6037             (pop articles))
6038           (set var articles))
6039          ((eq mark 'unexist)
6040           (set var (cdr marks)))))))))
6041
6042 (defun gnus-update-missing-marks (missing)
6043   "Go through the list of MISSING articles and remove them from the mark lists."
6044   (when missing
6045     (let (var m)
6046       ;; Go through all types.
6047       (dolist (elem gnus-article-mark-lists)
6048         (when (eq (gnus-article-mark-to-type (cdr elem)) 'list)
6049           (setq var (intern (format "gnus-newsgroup-%s" (car elem))))
6050           (when (symbol-value var)
6051             ;; This list has articles.  So we delete all missing
6052             ;; articles from it.
6053             (setq m missing)
6054             (while m
6055               (set var (delq (pop m) (symbol-value var))))))))))
6056
6057 (defun gnus-update-marks ()
6058   "Enter the various lists of marked articles into the newsgroup info list."
6059   (let ((types gnus-article-mark-lists)
6060         (info (gnus-get-info gnus-newsgroup-name))
6061         type list newmarked symbol delta-marks)
6062     (when info
6063       ;; Add all marks lists to the list of marks lists.
6064       (while (setq type (pop types))
6065         (setq list (symbol-value
6066                     (setq symbol
6067                           (intern (format "gnus-newsgroup-%s" (car type))))))
6068
6069         (when list
6070           ;; Get rid of the entries of the articles that have the
6071           ;; default score.
6072           (when (and (eq (cdr type) 'score)
6073                      gnus-save-score
6074                      list)
6075             (let* ((arts list)
6076                    (prev (cons nil list))
6077                    (all prev))
6078               (while arts
6079                 (if (or (not (consp (car arts)))
6080                         (= (cdar arts) gnus-summary-default-score))
6081                     (setcdr prev (cdr arts))
6082                   (setq prev arts))
6083                 (setq arts (cdr arts)))
6084               (setq list (cdr all)))))
6085
6086         (when (eq (cdr type) 'seen)
6087           (setq list (gnus-range-add list gnus-newsgroup-unseen)))
6088
6089         (when (eq (gnus-article-mark-to-type (cdr type)) 'list)
6090           (setq list (gnus-compress-sequence (set symbol (sort list '<)) t)))
6091
6092         (when (and (gnus-check-backend-function
6093                     'request-set-mark gnus-newsgroup-name)
6094                    (not (gnus-article-unpropagatable-p (cdr type))))
6095           (let* ((old (cdr (assq (cdr type) (gnus-info-marks info))))
6096                  ;; Don't do anything about marks for articles we
6097                  ;; didn't actually get any headers for.
6098                  (del
6099                   (gnus-list-range-intersection
6100                    gnus-newsgroup-articles
6101                    (gnus-remove-from-range (gnus-copy-sequence old) list)))
6102                  (add
6103                   (gnus-list-range-intersection
6104                    gnus-newsgroup-articles
6105                    (gnus-remove-from-range
6106                     (gnus-copy-sequence list) old))))
6107             (when add
6108               (push (list add 'add (list (cdr type))) delta-marks))
6109             (when del
6110               ;; Don't delete marks from outside the active range.
6111               ;; This shouldn't happen, but is a sanity check.
6112               (setq del (gnus-sorted-range-intersection
6113                          (gnus-active gnus-newsgroup-name) del))
6114               (push (list del 'del (list (cdr type))) delta-marks))))
6115
6116         (when (or list
6117                   (eq (cdr type) 'unexist))
6118           (push (cons (cdr type) list) newmarked)))
6119
6120       (when delta-marks
6121         (unless (gnus-check-group gnus-newsgroup-name)
6122           (error "Can't open server for %s" gnus-newsgroup-name))
6123         (gnus-request-set-mark gnus-newsgroup-name delta-marks))
6124
6125       ;; Enter these new marks into the info of the group.
6126       (if (nthcdr 3 info)
6127           (setcar (nthcdr 3 info) newmarked)
6128         ;; Add the marks lists to the end of the info.
6129         (when newmarked
6130           (setcdr (nthcdr 2 info) (list newmarked))))
6131
6132       ;; Cut off the end of the info if there's nothing else there.
6133       (let ((i 5))
6134         (while (and (> i 2)
6135                     (not (nth i info)))
6136           (when (nthcdr (decf i) info)
6137             (setcdr (nthcdr i info) nil)))))))
6138
6139 (defun gnus-set-mode-line (where)
6140   "Set the mode line of the article or summary buffers.
6141 If WHERE is `summary', the summary mode line format will be used."
6142   ;; Is this mode line one we keep updated?
6143   (when (and (memq where gnus-updated-mode-lines)
6144              (symbol-value
6145               (intern (format "gnus-%s-mode-line-format-spec" where))))
6146     (let (mode-string)
6147       ;; We evaluate this in the summary buffer since these
6148       ;; variables are buffer-local to that buffer.
6149       (with-current-buffer gnus-summary-buffer
6150         ;; We bind all these variables that are used in the `eval' form
6151         ;; below.
6152         (let* ((mformat (symbol-value
6153                          (intern
6154                           (format "gnus-%s-mode-line-format-spec" where))))
6155                (gnus-tmp-group-name (gnus-mode-string-quote
6156                                      (gnus-group-decoded-name
6157                                       gnus-newsgroup-name)))
6158                (gnus-tmp-article-number (or gnus-current-article 0))
6159                (gnus-tmp-unread gnus-newsgroup-unreads)
6160                (gnus-tmp-unread-and-unticked (length gnus-newsgroup-unreads))
6161                (gnus-tmp-unselected (length gnus-newsgroup-unselected))
6162                (gnus-tmp-unread-and-unselected
6163                 (cond ((and (zerop gnus-tmp-unread-and-unticked)
6164                             (zerop gnus-tmp-unselected))
6165                        "")
6166                       ((zerop gnus-tmp-unselected)
6167                        (format "{%d more}" gnus-tmp-unread-and-unticked))
6168                       (t (format "{%d(+%d) more}"
6169                                  gnus-tmp-unread-and-unticked
6170                                  gnus-tmp-unselected))))
6171                (gnus-tmp-subject
6172                 (if (and gnus-current-headers
6173                          (vectorp gnus-current-headers))
6174                     (gnus-mode-string-quote
6175                      (mail-header-subject gnus-current-headers))
6176                   ""))
6177                bufname-length max-len
6178                gnus-tmp-header) ;; passed as argument to any user-format-funcs
6179           (setq mode-string (eval mformat))
6180           (setq bufname-length (if (string-match "%b" mode-string)
6181                                    (- (length
6182                                        (buffer-name
6183                                         (if (eq where 'summary)
6184                                             nil
6185                                           (get-buffer gnus-article-buffer))))
6186                                       2)
6187                                  0))
6188           (setq max-len (max 4 (if gnus-mode-non-string-length
6189                                    (- (window-width)
6190                                       gnus-mode-non-string-length
6191                                       bufname-length)
6192                                  (length mode-string))))
6193           ;; We might have to chop a bit of the string off...
6194           (when (> (length mode-string) max-len)
6195             (setq mode-string
6196                   (concat (truncate-string-to-width mode-string (- max-len 3))
6197                           "...")))))
6198       ;; Update the mode line.
6199       (setq mode-line-buffer-identification
6200             (gnus-mode-line-buffer-identification (list mode-string)))
6201       (set-buffer-modified-p t))))
6202
6203 (defun gnus-create-xref-hashtb (from-newsgroup headers unreads)
6204   "Go through the HEADERS list and add all Xrefs to a hash table.
6205 The resulting hash table is returned, or nil if no Xrefs were found."
6206   (let* ((virtual (gnus-virtual-group-p from-newsgroup))
6207          (prefix (if virtual "" (gnus-group-real-prefix from-newsgroup)))
6208          (xref-hashtb (gnus-make-hashtable))
6209          start group entry number xrefs header)
6210     (while headers
6211       (setq header (pop headers))
6212       (when (and (setq xrefs (mail-header-xref header))
6213                  (not (memq (setq number (mail-header-number header))
6214                             unreads)))
6215         (setq start 0)
6216         (while (string-match "\\([^ ]+\\)[:/]\\([0-9]+\\)" xrefs start)
6217           (setq start (match-end 0))
6218           (setq group (if prefix
6219                           (concat prefix (substring xrefs (match-beginning 1)
6220                                                     (match-end 1)))
6221                         (substring xrefs (match-beginning 1) (match-end 1))))
6222           (setq number
6223                 (string-to-number (substring xrefs (match-beginning 2)
6224                                           (match-end 2))))
6225           (if (setq entry (gnus-gethash group xref-hashtb))
6226               (setcdr entry (cons number (cdr entry)))
6227             (gnus-sethash group (cons number nil) xref-hashtb)))))
6228     (and start xref-hashtb)))
6229
6230 (defun gnus-mark-xrefs-as-read (from-newsgroup headers unreads)
6231   "Look through all the headers and mark the Xrefs as read."
6232   (let ((virtual (gnus-virtual-group-p from-newsgroup))
6233         name info xref-hashtb idlist method nth4)
6234     (with-current-buffer gnus-group-buffer
6235       (when (setq xref-hashtb
6236                   (gnus-create-xref-hashtb from-newsgroup headers unreads))
6237         (mapatoms
6238          (lambda (group)
6239            (unless (string= from-newsgroup (setq name (symbol-name group)))
6240              (setq idlist (symbol-value group))
6241              ;; Dead groups are not updated.
6242              (and (prog1
6243                       (setq info (gnus-get-info name))
6244                     (when (stringp (setq nth4 (gnus-info-method info)))
6245                       (setq nth4 (gnus-server-to-method nth4))))
6246                   ;; Only do the xrefs if the group has the same
6247                   ;; select method as the group we have just read.
6248                   (or (gnus-methods-equal-p
6249                        nth4 (gnus-find-method-for-group from-newsgroup))
6250                       virtual
6251                       (equal nth4 (setq method (gnus-find-method-for-group
6252                                                 from-newsgroup)))
6253                       (and (equal (car nth4) (car method))
6254                            (equal (nth 1 nth4) (nth 1 method))))
6255                   gnus-use-cross-reference
6256                   (or (not (eq gnus-use-cross-reference t))
6257                       virtual
6258                       ;; Only do cross-references on subscribed
6259                       ;; groups, if that is what is wanted.
6260                       (<= (gnus-info-level info) gnus-level-subscribed))
6261                   (gnus-group-make-articles-read name idlist))))
6262          xref-hashtb)))))
6263
6264 (defun gnus-compute-read-articles (group articles)
6265   (let* ((entry (gnus-group-entry group))
6266          (info (nth 2 entry))
6267          (active (gnus-active group))
6268          ninfo)
6269     (when entry
6270       ;; First peel off all invalid article numbers.
6271       (when active
6272         (let ((ids articles)
6273               id first)
6274           (while (setq id (pop ids))
6275             (when (and first (> id (cdr active)))
6276               ;; We'll end up in this situation in one particular
6277               ;; obscure situation.  If you re-scan a group and get
6278               ;; a new article that is cross-posted to a different
6279               ;; group that has not been re-scanned, you might get
6280               ;; crossposted article that has a higher number than
6281               ;; Gnus believes possible.  So we re-activate this
6282               ;; group as well.  This might mean doing the
6283               ;; crossposting thingy will *increase* the number
6284               ;; of articles in some groups.  Tsk, tsk.
6285               (setq active (or (gnus-activate-group group) active)))
6286             (when (or (> id (cdr active))
6287                       (< id (car active)))
6288               (setq articles (delq id articles))))))
6289       ;; If the read list is nil, we init it.
6290       (if (and active
6291                (null (gnus-info-read info))
6292                (> (car active) 1))
6293           (setq ninfo (cons 1 (1- (car active))))
6294         (setq ninfo (gnus-info-read info)))
6295       ;; Then we add the read articles to the range.
6296       (gnus-add-to-range
6297        ninfo (setq articles (sort articles '<))))))
6298
6299 (defun gnus-group-make-articles-read (group articles)
6300   "Update the info of GROUP to say that ARTICLES are read."
6301   (let* ((num 0)
6302          (entry (gnus-group-entry group))
6303          (info (nth 2 entry))
6304          (active (gnus-active group))
6305          (set-marks
6306           (gnus-method-option-p
6307            (gnus-find-method-for-group group)
6308            'server-marks))
6309          range)
6310     (if (not entry)
6311         ;; Group that Gnus doesn't know exists, but still allow the
6312         ;; backend to set marks.
6313         (when set-marks
6314           (gnus-request-set-mark
6315            group (list (list (gnus-compress-sequence (sort articles #'<))
6316                              'add '(read)))))
6317       ;; Normal, subscribed groups.
6318       (setq range (gnus-compute-read-articles group articles))
6319       (with-current-buffer gnus-group-buffer
6320         (gnus-undo-register
6321           `(progn
6322              (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
6323              (gnus-info-set-read ',info ',(gnus-info-read info))
6324              (gnus-get-unread-articles-in-group ',info (gnus-active ,group))
6325              (when ,set-marks
6326                (gnus-request-set-mark
6327                 ,group (list (list ',range 'del '(read)))))
6328              (gnus-group-update-group ,group t))))
6329       ;; Add the read articles to the range.
6330       (gnus-info-set-read info range)
6331       (when set-marks
6332         (gnus-request-set-mark group (list (list range 'add '(read)))))
6333       ;; Then we have to re-compute how many unread
6334       ;; articles there are in this group.
6335       (when active
6336         (cond
6337          ((not range)
6338           (setq num (- (1+ (cdr active)) (car active))))
6339          ((not (listp (cdr range)))
6340           (setq num (- (cdr active) (- (1+ (cdr range))
6341                                        (car range)))))
6342          (t
6343           (while range
6344             (if (numberp (car range))
6345                 (setq num (1+ num))
6346               (setq num (+ num (- (1+ (cdar range)) (caar range)))))
6347             (setq range (cdr range)))
6348           (setq num (- (cdr active) num))))
6349         ;; Update the number of unread articles.
6350         (setcar entry num)
6351         ;; Update the group buffer.
6352         (unless (gnus-ephemeral-group-p group)
6353           (gnus-group-update-group group t))))))
6354
6355 (defun gnus-get-newsgroup-headers (&optional dependencies force-new)
6356   (let ((cur nntp-server-buffer)
6357         (dependencies
6358          (or dependencies
6359              (with-current-buffer gnus-summary-buffer
6360                gnus-newsgroup-dependencies)))
6361         headers id end ref number
6362         (mail-parse-charset gnus-newsgroup-charset)
6363         (mail-parse-ignored-charsets
6364          (save-current-buffer (condition-case nil
6365                                   (set-buffer gnus-summary-buffer)
6366                                 (error))
6367                               gnus-newsgroup-ignored-charsets)))
6368     (with-current-buffer nntp-server-buffer
6369       ;; Translate all TAB characters into SPACE characters.
6370       (subst-char-in-region (point-min) (point-max) ?\t ?  t)
6371       (subst-char-in-region (point-min) (point-max) ?\r ?  t)
6372       (ietf-drums-unfold-fws)
6373       (gnus-run-hooks 'gnus-parse-headers-hook)
6374       (let ((case-fold-search t)
6375             in-reply-to header p lines chars)
6376         (goto-char (point-min))
6377         ;; Search to the beginning of the next header.  Error messages
6378         ;; do not begin with 2 or 3.
6379         (while (re-search-forward "^[23][0-9]+ " nil t)
6380           (setq id nil
6381                 ref nil)
6382           ;; This implementation of this function, with nine
6383           ;; search-forwards instead of the one re-search-forward and
6384           ;; a case (which basically was the old function) is actually
6385           ;; about twice as fast, even though it looks messier.  You
6386           ;; can't have everything, I guess.  Speed and elegance
6387           ;; doesn't always go hand in hand.
6388           (setq
6389            header
6390            (vector
6391             ;; Number.
6392             (prog1
6393                 (setq number (read cur))
6394               (end-of-line)
6395               (setq p (point))
6396               (narrow-to-region (point)
6397                                 (or (and (search-forward "\n.\n" nil t)
6398                                          (- (point) 2))
6399                                     (point))))
6400             ;; Subject.
6401             (progn
6402               (goto-char p)
6403               (if (search-forward "\nsubject:" nil t)
6404                   (funcall gnus-decode-encoded-word-function
6405                            (nnheader-header-value))
6406                 "(none)"))
6407             ;; From.
6408             (progn
6409               (goto-char p)
6410               (if (search-forward "\nfrom:" nil t)
6411                   (funcall gnus-decode-encoded-address-function
6412                            (nnheader-header-value))
6413                 "(nobody)"))
6414             ;; Date.
6415             (progn
6416               (goto-char p)
6417               (if (search-forward "\ndate:" nil t)
6418                   (nnheader-header-value) ""))
6419             ;; Message-ID.
6420             (progn
6421               (goto-char p)
6422               (setq id (if (re-search-forward
6423                             "^message-id: *\\(<[^\n\t> ]+>\\)" nil t)
6424                            ;; We do it this way to make sure the Message-ID
6425                            ;; is (somewhat) syntactically valid.
6426                            (buffer-substring (match-beginning 1)
6427                                              (match-end 1))
6428                          ;; If there was no message-id, we just fake one
6429                          ;; to make subsequent routines simpler.
6430                          (nnheader-generate-fake-message-id number))))
6431             ;; References.
6432             (progn
6433               (goto-char p)
6434               (if (search-forward "\nreferences:" nil t)
6435                   (progn
6436                     (setq end (point))
6437                     (prog1
6438                         (nnheader-header-value)
6439                       (setq ref
6440                             (buffer-substring
6441                              (progn
6442                                (end-of-line)
6443                                (search-backward ">" end t)
6444                                (1+ (point)))
6445                              (progn
6446                                (search-backward "<" end t)
6447                                (point))))))
6448                 ;; Get the references from the in-reply-to header if there
6449                 ;; were no references and the in-reply-to header looks
6450                 ;; promising.
6451                 (if (and (search-forward "\nin-reply-to:" nil t)
6452                          (setq in-reply-to (nnheader-header-value))
6453                          (string-match "<[^>]+>" in-reply-to))
6454                     (let (ref2)
6455                       (setq ref (substring in-reply-to (match-beginning 0)
6456                                            (match-end 0)))
6457                       (while (string-match "<[^>]+>" in-reply-to (match-end 0))
6458                         (setq ref2 (substring in-reply-to (match-beginning 0)
6459                                               (match-end 0)))
6460                         (when (> (length ref2) (length ref))
6461                           (setq ref ref2)))
6462                       ref)
6463                   (setq ref nil))))
6464             ;; Chars.
6465             (progn
6466               (goto-char p)
6467               (if (search-forward "\nchars: " nil t)
6468                   (if (numberp (setq chars (ignore-errors (read cur))))
6469                       chars -1)
6470                 -1))
6471             ;; Lines.
6472             (progn
6473               (goto-char p)
6474               (if (search-forward "\nlines: " nil t)
6475                   (if (numberp (setq lines (ignore-errors (read cur))))
6476                       lines -1)
6477                 -1))
6478             ;; Xref.
6479             (progn
6480               (goto-char p)
6481               (and (search-forward "\nxref:" nil t)
6482                    (nnheader-header-value)))
6483             ;; Extra.
6484             (when gnus-extra-headers
6485               (let ((extra gnus-extra-headers)
6486                     out)
6487                 (while extra
6488                   (goto-char p)
6489                   (when (search-forward
6490                          (concat "\n" (symbol-name (car extra)) ":") nil t)
6491                     (push (cons (car extra) (nnheader-header-value))
6492                           out))
6493                   (pop extra))
6494                 out))))
6495           (when (equal id ref)
6496             (setq ref nil))
6497
6498           (when gnus-alter-header-function
6499             (funcall gnus-alter-header-function header)
6500             (setq id (mail-header-id header)
6501                   ref (gnus-parent-id (mail-header-references header))))
6502
6503           (when (setq header
6504                       (gnus-dependencies-add-header
6505                        header dependencies force-new))
6506             (push header headers))
6507           (goto-char (point-max))
6508           (widen))
6509         (nreverse headers)))))
6510
6511 ;; Goes through the xover lines and returns a list of vectors
6512 (defun gnus-get-newsgroup-headers-xover (sequence &optional
6513                                                   force-new dependencies
6514                                                   group also-fetch-heads)
6515   "Parse the news overview data in the server buffer.
6516 Return a list of headers that match SEQUENCE (see
6517 `nntp-retrieve-headers')."
6518   ;; Get the Xref when the users reads the articles since most/some
6519   ;; NNTP servers do not include Xrefs when using XOVER.
6520   (setq gnus-article-internal-prepare-hook '(gnus-article-get-xrefs))
6521   (let ((mail-parse-charset gnus-newsgroup-charset)
6522         (mail-parse-ignored-charsets gnus-newsgroup-ignored-charsets)
6523         (cur nntp-server-buffer)
6524         (dependencies (or dependencies gnus-newsgroup-dependencies))
6525         (allp (cond
6526                ((eq gnus-read-all-available-headers t)
6527                 t)
6528                ((and (stringp gnus-read-all-available-headers)
6529                      group)
6530                 (string-match gnus-read-all-available-headers group))
6531                (t
6532                 nil)))
6533         number headers header)
6534     (with-current-buffer nntp-server-buffer
6535       (subst-char-in-region (point-min) (point-max) ?\r ?  t)
6536       ;; Allow the user to mangle the headers before parsing them.
6537       (gnus-run-hooks 'gnus-parse-headers-hook)
6538       (goto-char (point-min))
6539       (gnus-parse-without-error
6540         (while (and (or sequence allp)
6541                     (not (eobp)))
6542           (setq number (read cur))
6543           (when (not allp)
6544             (while (and sequence
6545                         (< (car sequence) number))
6546               (setq sequence (cdr sequence))))
6547           (when (and (or allp
6548                          (and sequence
6549                               (eq number (car sequence))))
6550                      (progn
6551                        (setq sequence (cdr sequence))
6552                        (setq header (inline
6553                                       (gnus-nov-parse-line
6554                                        number dependencies force-new)))))
6555             (push header headers))
6556           (forward-line 1)))
6557       ;; A common bug in inn is that if you have posted an article and
6558       ;; then retrieves the active file, it will answer correctly --
6559       ;; the new article is included.  However, a NOV entry for the
6560       ;; article may not have been generated yet, so this may fail.
6561       ;; We work around this problem by retrieving the last few
6562       ;; headers using HEAD.
6563       (if (or (not also-fetch-heads)
6564               (not sequence))
6565           ;; We (probably) got all the headers.
6566           (nreverse headers)
6567         (let ((gnus-nov-is-evil t))
6568           (nconc
6569            (nreverse headers)
6570            (when (eq (gnus-retrieve-headers sequence group) 'headers)
6571              (gnus-get-newsgroup-headers))))))))
6572
6573 (defun gnus-article-get-xrefs ()
6574   "Fill in the Xref value in `gnus-current-headers', if necessary.
6575 This is meant to be called in `gnus-article-internal-prepare-hook'."
6576   (let ((headers (with-current-buffer gnus-summary-buffer
6577                    gnus-current-headers)))
6578     (or (not gnus-use-cross-reference)
6579         (not headers)
6580         (and (mail-header-xref headers)
6581              (not (string= (mail-header-xref headers) "")))
6582         (let ((case-fold-search t)
6583               xref)
6584           (save-restriction
6585             (nnheader-narrow-to-headers)
6586             (goto-char (point-min))
6587             (when (or (and (not (eobp))
6588                            (eq (downcase (char-after)) ?x)
6589                            (looking-at "Xref:"))
6590                       (search-forward "\nXref:" nil t))
6591               (goto-char (1+ (match-end 0)))
6592               (setq xref (buffer-substring (point) (point-at-eol)))
6593               (mail-header-set-xref headers xref)))))))
6594
6595 (defun gnus-summary-insert-subject (id &optional old-header use-old-header)
6596   "Find article ID and insert the summary line for that article.
6597 OLD-HEADER can either be a header or a line number to insert
6598 the subject line on.
6599 If USE-OLD-HEADER is non-nil, then OLD-HEADER should be a header,
6600 and OLD-HEADER will be used when the summary line is inserted,
6601 too, instead of trying to fetch new headers."
6602   (let* ((line (and (numberp old-header) old-header))
6603          (old-header (and (vectorp old-header) old-header))
6604          (header (cond ((and old-header use-old-header)
6605                         old-header)
6606                        ((and (numberp id)
6607                              (gnus-number-to-header id))
6608                         (gnus-number-to-header id))
6609                        (t
6610                         (gnus-read-header id))))
6611          (number (and (numberp id) id))
6612          d)
6613     (when header
6614       ;; Rebuild the thread that this article is part of and go to the
6615       ;; article we have fetched.
6616       (when (and (not gnus-show-threads)
6617                  old-header)
6618         (when (and number
6619                    (setq d (gnus-data-find (mail-header-number old-header))))
6620           (goto-char (gnus-data-pos d))
6621           (gnus-data-remove
6622            number
6623            (- (point-at-bol)
6624               (prog1
6625                   (1+ (point-at-eol))
6626                 (gnus-delete-line))))))
6627       ;; Remove list identifiers from subject.
6628       (let ((gnus-newsgroup-headers (list header)))
6629         (gnus-summary-remove-list-identifiers))
6630       (when old-header
6631         (mail-header-set-number header (mail-header-number old-header)))
6632       (setq gnus-newsgroup-sparse
6633             (delq (setq number (mail-header-number header))
6634                   gnus-newsgroup-sparse))
6635       (setq gnus-newsgroup-ancient (delq number gnus-newsgroup-ancient))
6636       (push number gnus-newsgroup-limit)
6637       (gnus-rebuild-thread (mail-header-id header) line)
6638       (gnus-summary-goto-subject number nil t))
6639     (when (and (numberp number)
6640                (> number 0))
6641       ;; We have to update the boundaries even if we can't fetch the
6642       ;; article if ID is a number -- so that the next `P' or `N'
6643       ;; command will fetch the previous (or next) article even
6644       ;; if the one we tried to fetch this time has been canceled.
6645       (unless (and gnus-newsgroup-end (< number gnus-newsgroup-end))
6646         (setq gnus-newsgroup-end number))
6647       (unless (and gnus-newsgroup-begin (> number gnus-newsgroup-begin))
6648         (setq gnus-newsgroup-begin number))
6649       (setq gnus-newsgroup-unselected
6650             (delq number gnus-newsgroup-unselected)))
6651     ;; Report back a success?
6652     (and header (mail-header-number header))))
6653
6654 ;;; Process/prefix in the summary buffer
6655
6656 (defun gnus-summary-work-articles (n)
6657   "Return a list of articles to be worked upon.
6658 The prefix argument, the list of process marked articles, and the
6659 current article will be taken into consideration."
6660   (with-current-buffer gnus-summary-buffer
6661     (cond
6662      (n
6663       ;; A numerical prefix has been given.
6664       (setq n (prefix-numeric-value n))
6665       (let ((backward (< n 0))
6666             (n (abs (prefix-numeric-value n)))
6667             articles article)
6668         (save-excursion
6669           (while
6670               (and (> n 0)
6671                    (push (setq article (gnus-summary-article-number))
6672                          articles)
6673                    (if backward
6674                        (gnus-summary-find-prev nil article)
6675                      (gnus-summary-find-next nil article)))
6676             (decf n)))
6677         (nreverse articles)))
6678      ((and (gnus-region-active-p) (mark))
6679       (message "region active")
6680       ;; Work on the region between point and mark.
6681       (let ((max (max (point) (mark)))
6682             articles article)
6683         (save-excursion
6684           (goto-char (min (point) (mark)))
6685           (while
6686               (and
6687                (push (setq article (gnus-summary-article-number)) articles)
6688                (gnus-summary-find-next nil article)
6689                (< (point) max)))
6690           (nreverse articles))))
6691      (gnus-newsgroup-processable
6692       ;; There are process-marked articles present.
6693       ;; Save current state.
6694       (gnus-summary-save-process-mark)
6695       ;; Return the list.
6696       (reverse gnus-newsgroup-processable))
6697      (t
6698       ;; Just return the current article.
6699       (list (gnus-summary-article-number))))))
6700
6701 (defmacro gnus-summary-iterate (arg &rest forms)
6702   "Iterate over the process/prefixed articles and do FORMS.
6703 ARG is the interactive prefix given to the command.  FORMS will be
6704 executed with point over the summary line of the articles."
6705   (let ((articles (make-symbol "gnus-summary-iterate-articles")))
6706     `(let ((,articles (gnus-summary-work-articles ,arg)))
6707        (while ,articles
6708          (gnus-summary-goto-subject (car ,articles))
6709          ,@forms
6710          (pop ,articles)))))
6711
6712 (put 'gnus-summary-iterate 'lisp-indent-function 1)
6713 (put 'gnus-summary-iterate 'edebug-form-spec '(form body))
6714
6715 (defun gnus-summary-save-process-mark ()
6716   "Push the current set of process marked articles on the stack."
6717   (interactive)
6718   (push (copy-sequence gnus-newsgroup-processable)
6719         gnus-newsgroup-process-stack))
6720
6721 (defun gnus-summary-kill-process-mark ()
6722   "Push the current set of process marked articles on the stack and unmark."
6723   (interactive)
6724   (gnus-summary-save-process-mark)
6725   (gnus-summary-unmark-all-processable))
6726
6727 (defun gnus-summary-yank-process-mark ()
6728   "Pop the last process mark state off the stack and restore it."
6729   (interactive)
6730   (unless gnus-newsgroup-process-stack
6731     (error "Empty mark stack"))
6732   (gnus-summary-process-mark-set (pop gnus-newsgroup-process-stack)))
6733
6734 (defun gnus-summary-process-mark-set (set)
6735   "Make SET into the current process marked articles."
6736   (gnus-summary-unmark-all-processable)
6737   (mapc 'gnus-summary-set-process-mark set))
6738
6739 ;;; Searching and stuff
6740
6741 (defun gnus-summary-search-group (&optional backward use-level)
6742   "Search for next unread newsgroup.
6743 If optional argument BACKWARD is non-nil, search backward instead."
6744   (with-current-buffer gnus-group-buffer
6745     (when (gnus-group-search-forward
6746            backward nil (if use-level (gnus-group-group-level) nil))
6747       (gnus-group-group-name))))
6748
6749 (defun gnus-summary-best-group (&optional exclude-group)
6750   "Find the name of the best unread group.
6751 If EXCLUDE-GROUP, do not go to this group."
6752   (with-current-buffer gnus-group-buffer
6753     (save-excursion
6754       (gnus-group-best-unread-group exclude-group))))
6755
6756 (defun gnus-summary-find-next (&optional unread article backward)
6757   (if backward
6758       (gnus-summary-find-prev unread article)
6759     (let* ((dummy (gnus-summary-article-intangible-p))
6760            (article (or article (gnus-summary-article-number)))
6761            (data (gnus-data-find-list article))
6762            result)
6763       (when (and (not dummy)
6764                  (or (not gnus-summary-check-current)
6765                      (not unread)
6766                      (not (gnus-data-unread-p (car data)))))
6767         (setq data (cdr data)))
6768       (when (setq result
6769                   (if unread
6770                       (progn
6771                         (while data
6772                           (unless (memq (gnus-data-number (car data))
6773                                         (cond
6774                                          ((eq gnus-auto-goto-ignores
6775                                               'always-undownloaded)
6776                                           gnus-newsgroup-undownloaded)
6777                                          (gnus-plugged
6778                                           nil)
6779                                          ((eq gnus-auto-goto-ignores
6780                                               'unfetched)
6781                                           gnus-newsgroup-unfetched)
6782                                          ((eq gnus-auto-goto-ignores
6783                                               'undownloaded)
6784                                           gnus-newsgroup-undownloaded)))
6785                             (when (gnus-data-unread-p (car data))
6786                               (setq result (car data)
6787                                     data nil)))
6788                           (setq data (cdr data)))
6789                         result)
6790                     (car data)))
6791         (goto-char (gnus-data-pos result))
6792         (gnus-data-number result)))))
6793
6794 (defun gnus-summary-find-prev (&optional unread article)
6795   (let* ((eobp (eobp))
6796          (article (or article (gnus-summary-article-number)))
6797          (data (gnus-data-find-list article (gnus-data-list 'rev)))
6798          result)
6799     (when (and (not eobp)
6800                (or (not gnus-summary-check-current)
6801                    (not unread)
6802                    (not (gnus-data-unread-p (car data)))))
6803       (setq data (cdr data)))
6804     (when (setq result
6805                 (if unread
6806                     (progn
6807                       (while data
6808                         (unless (memq (gnus-data-number (car data))
6809                                       (cond
6810                                        ((eq gnus-auto-goto-ignores
6811                                             'always-undownloaded)
6812                                         gnus-newsgroup-undownloaded)
6813                                        (gnus-plugged
6814                                         nil)
6815                                        ((eq gnus-auto-goto-ignores
6816                                             'unfetched)
6817                                         gnus-newsgroup-unfetched)
6818                                        ((eq gnus-auto-goto-ignores
6819                                             'undownloaded)
6820                                         gnus-newsgroup-undownloaded)))
6821                           (when (gnus-data-unread-p (car data))
6822                             (setq result (car data)
6823                                   data nil)))
6824                         (setq data (cdr data)))
6825                       result)
6826                   (car data)))
6827       (goto-char (gnus-data-pos result))
6828       (gnus-data-number result))))
6829
6830 (defun gnus-summary-find-subject (subject &optional unread backward article)
6831   (let* ((simp-subject (gnus-simplify-subject-fully subject))
6832          (article (or article (gnus-summary-article-number)))
6833          (articles (gnus-data-list backward))
6834          (arts (gnus-data-find-list article articles))
6835          result)
6836     (when (or (not gnus-summary-check-current)
6837               (not unread)
6838               (not (gnus-data-unread-p (car arts))))
6839       (setq arts (cdr arts)))
6840     (while arts
6841       (and (or (not unread)
6842                (gnus-data-unread-p (car arts)))
6843            (vectorp (gnus-data-header (car arts)))
6844            (gnus-subject-equal
6845             simp-subject (mail-header-subject (gnus-data-header (car arts))) t)
6846            (setq result (car arts)
6847                  arts nil))
6848       (setq arts (cdr arts)))
6849     (and result
6850          (goto-char (gnus-data-pos result))
6851          (gnus-data-number result))))
6852
6853 (defun gnus-summary-search-forward (&optional unread subject backward)
6854   "Search forward for an article.
6855 If UNREAD, look for unread articles.  If SUBJECT, look for
6856 articles with that subject.  If BACKWARD, search backward instead."
6857   (cond (subject (gnus-summary-find-subject subject unread backward))
6858         (backward (gnus-summary-find-prev unread))
6859         (t (gnus-summary-find-next unread))))
6860
6861 (defun gnus-recenter (&optional n)
6862   "Center point in window and redisplay frame.
6863 Also do horizontal recentering."
6864   (interactive "P")
6865   (when (and gnus-auto-center-summary
6866              (not (eq gnus-auto-center-summary 'vertical)))
6867     (gnus-horizontal-recenter))
6868   (if (fboundp 'recenter-top-bottom)
6869       (recenter-top-bottom n)
6870     (recenter n)))
6871
6872 (put 'gnus-recenter 'isearch-scroll t)
6873
6874 (defun gnus-forward-line-ignore-invisible (n)
6875   "Move N lines forward (backward if N is negative).
6876 Like forward-line, but skip over (and don't count) invisible lines."
6877   (let (done)
6878     (while (and (> n 0) (not done))
6879       ;; If the following character is currently invisible,
6880       ;; skip all characters with that same `invisible' property value.
6881       (while (gnus-invisible-p (point))
6882         (goto-char (gnus-next-char-property-change (point))))
6883       (forward-line 1)
6884       (if (eobp)
6885           (setq done t)
6886         (setq n (1- n))))
6887     (while (and (< n 0) (not done))
6888       (forward-line -1)
6889       (if (bobp) (setq done t)
6890         (setq n (1+ n))
6891         (while (and (not (bobp)) (gnus-invisible-p (1- (point))))
6892           (goto-char (gnus-previous-char-property-change (point))))))))
6893
6894 (defun gnus-summary-recenter ()
6895   "Center point in the summary window.
6896 If `gnus-auto-center-summary' is nil, or the article buffer isn't
6897 displayed, no centering will be performed."
6898   ;; Suggested by earle@mahendo.JPL.NASA.GOV (Greg Earle).
6899   ;; Recenter only when requested.  Suggested by popovich@park.cs.columbia.edu.
6900   (interactive)
6901   ;; The user has to want it.
6902   (when gnus-auto-center-summary
6903     (let* ((top (cond ((< (window-height) 4) 0)
6904                       ((< (window-height) 7) 1)
6905                       (t (if (numberp gnus-auto-center-summary)
6906                              gnus-auto-center-summary
6907                            (/ (1- (window-height)) 2)))))
6908            (height (1- (window-height)))
6909            (bottom (save-excursion
6910                      (goto-char (point-max))
6911                      (gnus-forward-line-ignore-invisible (- height))
6912                      (point)))
6913            (window (get-buffer-window (current-buffer))))
6914       (when (get-buffer-window gnus-article-buffer)
6915         ;; Only do recentering when the article buffer is displayed,
6916         ;; Set the window start to either `bottom', which is the biggest
6917         ;; possible valid number, or the second line from the top,
6918         ;; whichever is the least.
6919         (let ((top-pos (save-excursion
6920                          (gnus-forward-line-ignore-invisible (- top))
6921                          (point))))
6922           (if (> bottom top-pos)
6923               ;; Keep the second line from the top visible
6924               (set-window-start window top-pos)
6925             ;; Try to keep the bottom line visible; if it's partially
6926             ;; obscured, either scroll one more line to make it fully
6927             ;; visible, or revert to using TOP-POS.
6928             (save-excursion
6929               (goto-char (point-max))
6930               (gnus-forward-line-ignore-invisible -1)
6931               (let ((last-line-start (point)))
6932                 (goto-char bottom)
6933                 (set-window-start window (point) t)
6934                 (when (not (pos-visible-in-window-p last-line-start window))
6935                   (gnus-forward-line-ignore-invisible 1)
6936                   (set-window-start window (min (point) top-pos) t)))))))
6937       ;; Do horizontal recentering while we're at it.
6938       (when (and (get-buffer-window (current-buffer) t)
6939                  (not (eq gnus-auto-center-summary 'vertical)))
6940         (let ((selected (selected-window)))
6941           (select-window (get-buffer-window (current-buffer) t))
6942           (gnus-summary-position-point)
6943           (gnus-horizontal-recenter)
6944           (select-window selected))))))
6945
6946 (defun gnus-summary-jump-to-group (newsgroup)
6947   "Move point to NEWSGROUP in group mode buffer."
6948   ;; Keep update point of group mode buffer if visible.
6949   (if (eq (current-buffer) (get-buffer gnus-group-buffer))
6950       (save-window-excursion
6951         ;; Take care of tree window mode.
6952         (when (get-buffer-window gnus-group-buffer)
6953           (pop-to-buffer gnus-group-buffer))
6954         (gnus-group-jump-to-group newsgroup))
6955     (save-excursion
6956       ;; Take care of tree window mode.
6957       (if (get-buffer-window gnus-group-buffer 0)
6958           (pop-to-buffer gnus-group-buffer)
6959         (set-buffer gnus-group-buffer))
6960       (gnus-group-jump-to-group newsgroup))))
6961
6962 ;; This function returns a list of article numbers based on the
6963 ;; difference between the ranges of read articles in this group and
6964 ;; the range of active articles.
6965 (defun gnus-list-of-unread-articles (group)
6966   (let* ((read (gnus-info-read (gnus-get-info group)))
6967          (active (or (gnus-active group) (gnus-activate-group group)))
6968          (last (or (cdr active)
6969                    (error "Group %s couldn't be activated " group)))
6970          (bottom (if gnus-newsgroup-maximum-articles
6971                      (max (car active)
6972                           (- last gnus-newsgroup-maximum-articles -1))
6973                    (car active)))
6974          first nlast unread)
6975     ;; If none are read, then all are unread.
6976     (if (not read)
6977         (setq first bottom)
6978       ;; If the range of read articles is a single range, then the
6979       ;; first unread article is the article after the last read
6980       ;; article.  Sounds logical, doesn't it?
6981       (if (and (not (listp (cdr read)))
6982                (or (< (car read) bottom)
6983                    (progn (setq read (list read))
6984                           nil)))
6985           (setq first (max bottom (1+ (cdr read))))
6986         ;; `read' is a list of ranges.
6987         (when (/= (setq nlast (or (and (numberp (car read)) (car read))
6988                                   (caar read)))
6989                   1)
6990           (setq first bottom))
6991         (while read
6992           (when first
6993             (while (< first nlast)
6994               (setq unread (cons first unread)
6995                     first (1+ first))))
6996           (setq first (1+ (if (atom (car read)) (car read) (cdar read))))
6997           (setq nlast (if (atom (cadr read)) (cadr read) (caadr read)))
6998           (setq read (cdr read)))))
6999     ;; And add the last unread articles.
7000     (while (<= first last)
7001       (setq unread (cons first unread)
7002             first (1+ first)))
7003     ;; Return the list of unread articles.
7004     (delq 0 (nreverse unread))))
7005
7006 (defun gnus-list-of-read-articles (group)
7007   "Return a list of unread, unticked and non-dormant articles."
7008   (let* ((info (gnus-get-info group))
7009          (marked (gnus-info-marks info))
7010          (active (gnus-active group)))
7011     (and info active
7012          (gnus-list-range-difference
7013           (gnus-list-range-difference
7014            (gnus-sorted-complement
7015             (gnus-uncompress-range
7016              (if gnus-newsgroup-maximum-articles
7017                  (cons (max (car active)
7018                             (- (cdr active)
7019                                gnus-newsgroup-maximum-articles
7020                                -1))
7021                        (cdr active))
7022                active))
7023             (gnus-list-of-unread-articles group))
7024            (cdr (assq 'dormant marked)))
7025           (cdr (assq 'tick marked))))))
7026
7027 ;; This function returns a sequence of article numbers based on the
7028 ;; difference between the ranges of read articles in this group and
7029 ;; the range of active articles.
7030 (defun gnus-sequence-of-unread-articles (group)
7031   (let* ((read (gnus-info-read (gnus-get-info group)))
7032          (active (or (gnus-active group) (gnus-activate-group group)))
7033          (last (cdr active))
7034          (bottom (if gnus-newsgroup-maximum-articles
7035                      (max (car active)
7036                           (- last gnus-newsgroup-maximum-articles -1))
7037                    (car active)))
7038          first nlast unread)
7039     ;; If none are read, then all are unread.
7040     (if (not read)
7041         (setq first bottom)
7042       ;; If the range of read articles is a single range, then the
7043       ;; first unread article is the article after the last read
7044       ;; article.  Sounds logical, doesn't it?
7045       (if (and (not (listp (cdr read)))
7046                (or (< (car read) bottom)
7047                    (progn (setq read (list read))
7048                           nil)))
7049           (setq first (max bottom (1+ (cdr read))))
7050         ;; `read' is a list of ranges.
7051         (when (/= (setq nlast (or (and (numberp (car read)) (car read))
7052                                   (caar read)))
7053                   1)
7054           (setq first bottom))
7055         (while read
7056           (when first
7057             (push (cons first nlast) unread))
7058           (setq first (1+ (if (atom (car read)) (car read) (cdar read))))
7059           (setq nlast (if (atom (cadr read)) (cadr read) (caadr read)))
7060           (setq read (cdr read)))))
7061     ;; And add the last unread articles.
7062     (cond ((not (and first last))
7063            nil)
7064           ((< first last)
7065            (push (cons first last) unread))
7066           ((= first last)
7067            (push first unread)))
7068     ;; Return the sequence of unread articles.
7069     (delq 0 (nreverse unread))))
7070
7071 ;; Various summary commands
7072
7073 (defun gnus-summary-select-article-buffer ()
7074   "Reconfigure windows to show the article buffer.
7075 If `gnus-widen-article-window' is set, show only the article
7076 buffer."
7077   (interactive)
7078   (if (not (gnus-buffer-live-p gnus-article-buffer))
7079       (error "There is no article buffer for this summary buffer")
7080     (unless (get-buffer-window gnus-article-buffer)
7081       (gnus-summary-show-article))
7082     (gnus-configure-windows
7083      (if gnus-widen-article-window
7084          'only-article
7085        'article)
7086      t)
7087     (select-window (get-buffer-window gnus-article-buffer))))
7088
7089 (defun gnus-summary-universal-argument (arg)
7090   "Perform any operation on all articles that are process/prefixed."
7091   (interactive "P")
7092   (let ((articles (gnus-summary-work-articles arg))
7093         func article)
7094     (if (eq
7095          (setq
7096           func
7097           (key-binding
7098            (read-key-sequence
7099             (substitute-command-keys
7100              "\\<gnus-summary-mode-map>\\[gnus-summary-universal-argument]"))))
7101          'undefined)
7102         (gnus-error 1 "Undefined key")
7103       (save-excursion
7104         (while articles
7105           (gnus-summary-goto-subject (setq article (pop articles)))
7106           (let (gnus-newsgroup-processable)
7107             (command-execute func))
7108           (gnus-summary-remove-process-mark article)))))
7109   (gnus-summary-position-point))
7110
7111 (defun gnus-summary-toggle-truncation (&optional arg)
7112   "Toggle truncation of summary lines.
7113 With ARG, turn line truncation on if ARG is positive."
7114   (interactive "P")
7115   (setq truncate-lines
7116         (if (null arg) (not truncate-lines)
7117           (> (prefix-numeric-value arg) 0)))
7118   (redraw-display))
7119
7120 (defun gnus-summary-find-for-reselect ()
7121   "Return the number of an article to stay on across a reselect.
7122 The current article is considered, then following articles, then previous
7123 articles.  An article is sought which is not canceled and isn't a temporary
7124 insertion from another group.  If there's no such then return a dummy 0."
7125   (let (found)
7126     (dolist (rev '(nil t))
7127       (unless found      ; don't demand the reverse list if we don't need it
7128         (let ((data (gnus-data-find-list
7129                      (gnus-summary-article-number) (gnus-data-list rev))))
7130           (while (and data (not found))
7131             (if (and (< 0 (gnus-data-number (car data)))
7132                      (not (eq gnus-canceled-mark (gnus-data-mark (car data)))))
7133                 (setq found (gnus-data-number (car data))))
7134             (setq data (cdr data))))))
7135     (or found 0)))
7136
7137 (defun gnus-summary-reselect-current-group (&optional all rescan)
7138   "Exit and then reselect the current newsgroup.
7139 The prefix argument ALL means to select all articles."
7140   (interactive "P")
7141   (when (gnus-ephemeral-group-p gnus-newsgroup-name)
7142     (error "Ephemeral groups can't be reselected"))
7143   (let ((current-subject (gnus-summary-find-for-reselect))
7144         (group gnus-newsgroup-name))
7145     (setq gnus-newsgroup-begin nil)
7146     (gnus-summary-exit nil 'leave-hidden)
7147     ;; We have to adjust the point of group mode buffer because
7148     ;; point was moved to the next unread newsgroup by exiting.
7149     (gnus-summary-jump-to-group group)
7150     (when rescan
7151       (save-excursion
7152         (gnus-group-get-new-news-this-group 1)))
7153     (gnus-group-read-group all t)
7154     (gnus-summary-goto-subject current-subject nil t)))
7155
7156 (defun gnus-summary-rescan-group (&optional all)
7157   "Exit the newsgroup, ask for new articles, and select the newsgroup."
7158   (interactive "P")
7159   (let ((config gnus-current-window-configuration))
7160     (gnus-summary-reselect-current-group all t)
7161     (gnus-configure-windows config)
7162     (when (eq config 'article)
7163       (gnus-summary-select-article))))
7164
7165 (defun gnus-summary-update-info (&optional non-destructive)
7166   (save-excursion
7167     (let ((group gnus-newsgroup-name))
7168       (when group
7169         (when gnus-newsgroup-kill-headers
7170           (setq gnus-newsgroup-killed
7171                 (gnus-compress-sequence
7172                  (gnus-sorted-union
7173                   (gnus-list-range-intersection
7174                    gnus-newsgroup-unselected gnus-newsgroup-killed)
7175                   gnus-newsgroup-unreads)
7176                  t)))
7177         (unless (listp (cdr gnus-newsgroup-killed))
7178           (setq gnus-newsgroup-killed (list gnus-newsgroup-killed)))
7179         (let ((headers gnus-newsgroup-headers)
7180               (ephemeral-p (gnus-ephemeral-group-p group))
7181               info)
7182           (unless ephemeral-p
7183             (setq info (copy-sequence (gnus-get-info group))
7184                   info (delq (gnus-info-params info) info)))
7185           ;; Set the new ranges of read articles.
7186           (with-current-buffer gnus-group-buffer
7187             (gnus-undo-force-boundary))
7188           (gnus-update-read-articles
7189            group (gnus-sorted-union
7190                   gnus-newsgroup-unreads gnus-newsgroup-unselected))
7191           ;; Set the current article marks.
7192           (let ((gnus-newsgroup-scored
7193                  (if (and (not gnus-save-score)
7194                           (not non-destructive))
7195                      nil
7196                    gnus-newsgroup-scored)))
7197             (save-excursion
7198               (gnus-update-marks)))
7199           ;; Do the cross-ref thing.
7200           (when gnus-use-cross-reference
7201             (gnus-mark-xrefs-as-read group headers gnus-newsgroup-unreads))
7202           ;; Do not switch windows but change the buffer to work.
7203           (set-buffer gnus-group-buffer)
7204           (unless ephemeral-p
7205             (gnus-group-update-group
7206              group nil
7207              (equal info
7208                     (setq info (copy-sequence (gnus-get-info group))
7209                           info (delq (gnus-info-params info) info))))))))))
7210
7211 (defun gnus-summary-save-newsrc (&optional force)
7212   "Save the current number of read/marked articles in the dribble buffer.
7213 The dribble buffer will then be saved.
7214 If FORCE (the prefix), also save the .newsrc file(s)."
7215   (interactive "P")
7216   (gnus-summary-update-info t)
7217   (if force
7218       (gnus-save-newsrc-file)
7219     (gnus-dribble-save)))
7220
7221 (declare-function gnus-cache-write-active "gnus-cache" (&optional force))
7222 (declare-function gnus-article-stop-animations "gnus-art" ())
7223
7224 (defun gnus-summary-exit (&optional temporary leave-hidden)
7225   "Exit reading current newsgroup, and then return to group selection mode.
7226 `gnus-exit-group-hook' is called with no arguments if that value is non-nil."
7227   (interactive)
7228   (gnus-set-global-variables)
7229   (when (gnus-buffer-live-p gnus-article-buffer)
7230     (with-current-buffer gnus-article-buffer
7231       (mm-destroy-parts gnus-article-mime-handles)
7232       ;; Set it to nil for safety reason.
7233       (setq gnus-article-mime-handle-alist nil)
7234       (setq gnus-article-mime-handles nil)))
7235   (gnus-kill-save-kill-buffer)
7236   (gnus-async-halt-prefetch)
7237   (let* ((group gnus-newsgroup-name)
7238          (quit-config (gnus-group-quit-config gnus-newsgroup-name))
7239          (gnus-group-is-exiting-p t)
7240          (article-buffer gnus-article-buffer)
7241          (original-article-buffer gnus-original-article-buffer)
7242          (mode major-mode)
7243          (group-point nil)
7244          (buf (current-buffer))
7245          ;; `gnus-single-article-buffer' is nil buffer-locally in
7246          ;; ephemeral group of which summary buffer will be killed,
7247          ;; but the global value may be non-nil.
7248          (single-article-buffer gnus-single-article-buffer))
7249     (unless quit-config
7250       ;; Do adaptive scoring, and possibly save score files.
7251       (when gnus-newsgroup-adaptive
7252         (gnus-score-adaptive))
7253       (when gnus-use-scoring
7254         (gnus-score-save)))
7255     (gnus-run-hooks 'gnus-summary-prepare-exit-hook)
7256     (when gnus-use-cache
7257       (gnus-cache-possibly-remove-articles)
7258       (gnus-cache-save-buffers))
7259     (gnus-async-prefetch-remove-group group)
7260     (when gnus-suppress-duplicates
7261       (gnus-dup-enter-articles))
7262     (when gnus-use-trees
7263       (gnus-tree-close))
7264     (when gnus-use-cache
7265       (gnus-cache-write-active))
7266     ;; Remove entries for this group.
7267     (nnmail-purge-split-history (gnus-group-real-name group))
7268     ;; Make all changes in this group permanent.
7269     (unless quit-config
7270       (gnus-run-hooks 'gnus-exit-group-hook)
7271       (gnus-summary-update-info))
7272     (gnus-close-group group)
7273     ;; Make sure where we were, and go to next newsgroup.
7274     (when (buffer-live-p (get-buffer gnus-group-buffer))
7275       (set-buffer gnus-group-buffer))
7276     (unless quit-config
7277       (gnus-group-jump-to-group group))
7278     (gnus-run-hooks 'gnus-summary-exit-hook)
7279     (unless (or quit-config
7280                 (not gnus-summary-next-group-on-exit)
7281                 ;; If this group has disappeared from the summary
7282                 ;; buffer, don't skip forwards.
7283                 (not (string= group (gnus-group-group-name))))
7284       (gnus-group-next-unread-group 1))
7285     (setq group-point (point))
7286     (gnus-article-stop-animations)
7287     (if temporary
7288         nil                             ;Nothing to do.
7289       (set-buffer buf)
7290       (if (not gnus-kill-summary-on-exit)
7291           (progn
7292             (gnus-deaden-summary)
7293             (setq mode nil))
7294         (when (get-buffer gnus-article-buffer)
7295           (bury-buffer gnus-article-buffer))
7296         ;; Return to group mode buffer.
7297         (when (eq mode 'gnus-summary-mode)
7298           (gnus-kill-buffer buf)))
7299
7300       (setq gnus-current-select-method gnus-select-method)
7301       (when (gnus-buffer-live-p gnus-group-buffer)
7302         (set-buffer gnus-group-buffer))
7303       (if quit-config
7304           (gnus-handle-ephemeral-exit quit-config)
7305         (goto-char group-point)
7306         ;; If gnus-group-buffer is already displayed, make sure we also move
7307         ;; the cursor in the window that displays it.
7308         (let ((win (get-buffer-window (current-buffer) 0)))
7309           (if win (set-window-point win (point))))
7310         (unless leave-hidden
7311           (gnus-configure-windows 'group 'force)))
7312
7313       ;; If we have several article buffers, we kill them at exit.
7314       (unless single-article-buffer
7315         (when (gnus-buffer-live-p article-buffer)
7316           (with-current-buffer article-buffer
7317             ;; Don't kill sticky article buffers
7318             (unless (eq major-mode 'gnus-sticky-article-mode)
7319               (gnus-kill-buffer article-buffer)
7320               (setq gnus-article-current nil))))
7321         (gnus-kill-buffer original-article-buffer))
7322
7323       ;; Clear the current group name.
7324       (unless quit-config
7325         (setq gnus-newsgroup-name nil)))))
7326
7327 (declare-function gnus-stop-downloads "gnus-art" ())
7328
7329 (defalias 'gnus-summary-quit 'gnus-summary-exit-no-update)
7330 (defun gnus-summary-exit-no-update (&optional no-questions)
7331   "Quit reading current newsgroup without updating read article info."
7332   (interactive)
7333   (let* ((group gnus-newsgroup-name)
7334          (gnus-group-is-exiting-p t)
7335          (gnus-group-is-exiting-without-update-p t)
7336          (quit-config (gnus-group-quit-config group)))
7337     (when (or no-questions
7338               (gnus-ephemeral-group-p group)
7339               gnus-expert-user
7340               (gnus-y-or-n-p "Discard changes to this group and exit? "))
7341       (gnus-async-halt-prefetch)
7342       (run-hooks 'gnus-summary-prepare-exit-hook)
7343       (when (gnus-buffer-live-p gnus-article-buffer)
7344         (with-current-buffer gnus-article-buffer
7345           (gnus-article-stop-animations)
7346           (gnus-stop-downloads)
7347           (mm-destroy-parts gnus-article-mime-handles)
7348           ;; Set it to nil for safety reason.
7349           (setq gnus-article-mime-handle-alist nil)
7350           (setq gnus-article-mime-handles nil)))
7351       ;; If we have several article buffers, we kill them at exit.
7352       (unless gnus-single-article-buffer
7353         (gnus-kill-buffer gnus-article-buffer)
7354         (gnus-kill-buffer gnus-original-article-buffer)
7355         (setq gnus-article-current nil))
7356       ;; Return to the group buffer.
7357       (if (not gnus-kill-summary-on-exit)
7358           (progn
7359             (gnus-deaden-summary)
7360             (gnus-configure-windows 'group 'force))
7361         (gnus-configure-windows 'group 'force)
7362         (gnus-close-group group)
7363         (gnus-kill-buffer gnus-summary-buffer))
7364       (unless gnus-single-article-buffer
7365         (setq gnus-article-current nil))
7366       (when gnus-use-trees
7367         (gnus-tree-close))
7368       (gnus-async-prefetch-remove-group group)
7369       (when (get-buffer gnus-article-buffer)
7370         (bury-buffer gnus-article-buffer))
7371       ;; Clear the current group name.
7372       (setq gnus-newsgroup-name nil)
7373       (unless (gnus-ephemeral-group-p group)
7374         (gnus-group-update-group group nil t))
7375       (when (equal (gnus-group-group-name) group)
7376         (gnus-group-next-unread-group 1))
7377       (gnus-article-stop-animations)
7378       (when quit-config
7379         (gnus-handle-ephemeral-exit quit-config)))))
7380
7381 (defun gnus-handle-ephemeral-exit (quit-config)
7382   "Handle movement when leaving an ephemeral group.
7383 The state which existed when entering the ephemeral is reset."
7384   (if (not (buffer-live-p (car quit-config)))
7385       (when (gnus-buffer-live-p gnus-group-buffer)
7386         (gnus-configure-windows 'group 'force))
7387     (set-buffer (car quit-config))
7388     (unless (eq (cdr quit-config) 'group)
7389       (setq gnus-current-select-method
7390             (gnus-find-method-for-group gnus-newsgroup-name)))
7391     (cond ((derived-mode-p 'gnus-summary-mode)
7392            (gnus-set-global-variables))
7393           ((derived-mode-p 'gnus-article-mode)
7394            (save-current-buffer
7395              ;; The `gnus-summary-buffer' variable may point
7396              ;; to the old summary buffer when using a single
7397              ;; article buffer.
7398              (unless (gnus-buffer-live-p gnus-summary-buffer)
7399                (set-buffer gnus-group-buffer))
7400              (set-buffer gnus-summary-buffer)
7401              (gnus-set-global-variables))))
7402     (if (or (eq (cdr quit-config) 'article)
7403             (eq (cdr quit-config) 'pick))
7404         (if (and (boundp 'gnus-pick-mode) (symbol-value 'gnus-pick-mode))
7405             (gnus-configure-windows 'pick 'force)
7406           (gnus-configure-windows (cdr quit-config) 'force))
7407       (gnus-configure-windows (cdr quit-config) 'force))
7408     (when (derived-mode-p 'gnus-summary-mode)
7409       (if (memq gnus-auto-select-on-ephemeral-exit '(next-noselect
7410                                                      next-unread-noselect))
7411           (when (zerop (cond ((eq gnus-auto-select-on-ephemeral-exit
7412                                   'next-noselect)
7413                               (gnus-summary-next-subject 1 nil t))
7414                              ((eq gnus-auto-select-on-ephemeral-exit
7415                                   'next-unread-noselect)
7416                               (gnus-summary-next-subject 1 t t))))
7417             ;; Hide the article buffer which displays the article different
7418             ;; from the one that the cursor points to in the summary buffer.
7419             (gnus-configure-windows 'summary 'force))
7420         (cond ((eq gnus-auto-select-on-ephemeral-exit 'next)
7421                (gnus-summary-next-subject 1))
7422               ((eq gnus-auto-select-on-ephemeral-exit 'next-unread)
7423                (gnus-summary-next-subject 1 t))))
7424       (gnus-summary-recenter)
7425       (gnus-summary-position-point))))
7426
7427 ;;; Dead summaries.
7428
7429 (defvar gnus-dead-summary-mode-map
7430   (let ((map (make-keymap)))
7431     (suppress-keymap map)
7432     (substitute-key-definition 'undefined 'gnus-summary-wake-up-the-dead map)
7433     (dolist (key '("\C-d" "\r" "\177" [delete]))
7434       (define-key map key 'gnus-summary-wake-up-the-dead))
7435     (dolist (key '("q" "Q"))
7436       (define-key map key 'bury-buffer))
7437     map))
7438
7439 (define-minor-mode gnus-dead-summary-mode
7440   "Minor mode for Gnus summary buffers."
7441   :lighter " Dead" :keymap gnus-dead-summary-mode-map
7442   (unless (derived-mode-p 'gnus-summary-mode)
7443     (setq gnus-dead-summary-mode nil)))
7444
7445 (defun gnus-deaden-summary ()
7446   "Make the current summary buffer into a dead summary buffer."
7447   ;; Kill any previous dead summary buffer.
7448   (when (and gnus-dead-summary
7449              (buffer-name gnus-dead-summary))
7450     (with-current-buffer gnus-dead-summary
7451       (when gnus-dead-summary-mode
7452         (kill-buffer (current-buffer)))))
7453   ;; Make this the current dead summary.
7454   (setq gnus-dead-summary (current-buffer))
7455   (gnus-dead-summary-mode 1)
7456   (let ((name (buffer-name)))
7457     (when (string-match "Summary" name)
7458       (rename-buffer
7459        (concat (substring name 0 (match-beginning 0)) "Dead "
7460                (substring name (match-beginning 0)))
7461        t)
7462       (bury-buffer))))
7463
7464 (defun gnus-kill-or-deaden-summary (buffer)
7465   "Kill or deaden the summary BUFFER."
7466   (save-excursion
7467     (when (and (buffer-name buffer)
7468                (not gnus-single-article-buffer))
7469       (with-current-buffer buffer
7470         (gnus-kill-buffer gnus-article-buffer)
7471         (gnus-kill-buffer gnus-original-article-buffer)))
7472     (cond
7473      ;; Kill the buffer.
7474      (gnus-kill-summary-on-exit
7475       (when (and gnus-use-trees
7476                  (gnus-buffer-exists-p buffer))
7477         (with-current-buffer buffer
7478           (gnus-tree-close)))
7479       (gnus-kill-buffer buffer))
7480      ;; Deaden the buffer.
7481      ((gnus-buffer-exists-p buffer)
7482       (with-current-buffer buffer
7483         (gnus-deaden-summary))))))
7484
7485 (defun gnus-summary-wake-up-the-dead (&rest args)
7486   "Wake up the dead summary buffer."
7487   (interactive)
7488   (gnus-dead-summary-mode -1)
7489   (let ((name (buffer-name)))
7490     (when (string-match "Dead " name)
7491       (rename-buffer
7492        (concat (substring name 0 (match-beginning 0))
7493                (substring name (match-end 0)))
7494        t)))
7495   (gnus-message 3 "This dead summary is now alive again"))
7496
7497 ;; Suggested by Per Abrahamsen <amanda@iesd.auc.dk>.
7498 (defun gnus-summary-describe-group (&optional force)
7499   "Describe the current newsgroup."
7500   (interactive "P")
7501   (gnus-group-describe-group force gnus-newsgroup-name))
7502
7503 (defun gnus-summary-describe-briefly ()
7504   "Describe summary mode commands briefly."
7505   (interactive)
7506   (gnus-message 6 "%s" (substitute-command-keys "\\<gnus-summary-mode-map>\\[gnus-summary-next-page]:Select  \\[gnus-summary-next-unread-article]:Forward  \\[gnus-summary-prev-unread-article]:Backward  \\[gnus-summary-exit]:Exit  \\[gnus-info-find-node]:Run Info   \\[gnus-summary-describe-briefly]:This help")))
7507
7508 ;; Walking around group mode buffer from summary mode.
7509
7510 (defun gnus-summary-next-group (&optional no-article target-group backward)
7511   "Exit current newsgroup and then select next unread newsgroup.
7512 If prefix argument NO-ARTICLE is non-nil, no article is selected
7513 initially.  If TARGET-GROUP, go to this group.  If BACKWARD, go to
7514 previous group instead."
7515   (interactive "P")
7516   ;; Stop pre-fetching.
7517   (gnus-async-halt-prefetch)
7518   (let ((current-group gnus-newsgroup-name)
7519         (current-buffer (current-buffer))
7520         entered)
7521     ;; First we semi-exit this group to update Xrefs and all variables.
7522     ;; We can't do a real exit, because the window conf must remain
7523     ;; the same in case the user is prompted for info, and we don't
7524     ;; want the window conf to change before that...
7525     (gnus-summary-exit t)
7526     (while (not entered)
7527       ;; Then we find what group we are supposed to enter.
7528       (set-buffer gnus-group-buffer)
7529       (gnus-group-jump-to-group current-group)
7530       (setq target-group
7531             (or target-group
7532                 (if (eq gnus-keep-same-level 'best)
7533                     (gnus-summary-best-group gnus-newsgroup-name)
7534                   (gnus-summary-search-group backward gnus-keep-same-level))))
7535       (if (not target-group)
7536           ;; There are no further groups, so we return to the group
7537           ;; buffer.
7538           (progn
7539             (gnus-message 5 "Returning to the group buffer")
7540             (setq entered t)
7541             (when (gnus-buffer-live-p current-buffer)
7542               (set-buffer current-buffer)
7543               (gnus-summary-exit))
7544             (gnus-run-hooks 'gnus-group-no-more-groups-hook))
7545         ;; We try to enter the target group.
7546         (gnus-group-jump-to-group target-group)
7547         (let ((unreads (gnus-group-group-unread)))
7548           (if (and (or (eq t unreads)
7549                        (and unreads (not (zerop unreads))))
7550                    (gnus-summary-read-group
7551                     target-group nil no-article
7552                     (and (buffer-name current-buffer) current-buffer)
7553                     nil backward))
7554               (setq entered t)
7555             (setq current-group target-group
7556                   target-group nil)))))))
7557
7558 (defun gnus-summary-prev-group (&optional no-article)
7559   "Exit current newsgroup and then select previous unread newsgroup.
7560 If prefix argument NO-ARTICLE is non-nil, no article is selected initially."
7561   (interactive "P")
7562   (gnus-summary-next-group no-article nil t))
7563
7564 ;; Walking around summary lines.
7565
7566 (defun gnus-summary-first-subject (&optional unread undownloaded unseen)
7567   "Go to the first subject satisfying any non-nil constraint.
7568 If UNREAD is non-nil, the article should be unread.
7569 If UNDOWNLOADED is non-nil, the article should be undownloaded.
7570 If UNSEEN is non-nil, the article should be unseen as well as unread.
7571 Returns the article selected or nil if there are no matching articles."
7572   (interactive "P")
7573   (cond
7574    ;; Empty summary.
7575    ((null gnus-newsgroup-data)
7576     (gnus-message 3 "No articles in the group")
7577     nil)
7578    ;; Pick the first article.
7579    ((not (or unread undownloaded unseen))
7580     (goto-char (gnus-data-pos (car gnus-newsgroup-data)))
7581     (gnus-data-number (car gnus-newsgroup-data)))
7582    ;; Find the first unread article.
7583    (t
7584     (let ((data gnus-newsgroup-data))
7585       (while (and data
7586                   (let ((num (gnus-data-number (car data))))
7587                     (or (memq num gnus-newsgroup-unfetched)
7588                         (not (or (and unread
7589                                       (memq num gnus-newsgroup-unreads))
7590                                  (and undownloaded
7591                                       (memq num gnus-newsgroup-undownloaded))
7592                                  (and unseen
7593                                       (memq num gnus-newsgroup-unseen)
7594                                       (memq num gnus-newsgroup-unreads)))))))
7595         (setq data (cdr data)))
7596       (prog1
7597           (if data
7598               (progn
7599                 (goto-char (gnus-data-pos (car data)))
7600                 (gnus-data-number (car data)))
7601             (gnus-message 3 "No more%s articles"
7602                           (let* ((r (when unread " unread"))
7603                                  (d (when undownloaded " undownloaded"))
7604                                  (s (when unseen " unseen"))
7605                                  (l (delq nil (list r d s))))
7606                             (cond ((= 3 (length l))
7607                                    (concat r "," d ", or" s))
7608                                   ((= 2 (length l))
7609                                    (concat (car l) ", or" (cadr l)))
7610                                   ((= 1 (length l))
7611                                    (car l))
7612                                   (t
7613                                    ""))))
7614             nil
7615             )
7616         (gnus-summary-position-point))))))
7617
7618 (defun gnus-summary-next-subject (n &optional unread dont-display)
7619   "Go to next N'th summary line.
7620 If N is negative, go to the previous N'th subject line.
7621 If UNREAD is non-nil, only unread articles are selected.
7622 The difference between N and the actual number of steps taken is
7623 returned."
7624   (interactive "p")
7625   (let ((backward (< n 0))
7626         (n (abs n)))
7627     (while (and (> n 0)
7628                 (if backward
7629                     (gnus-summary-find-prev unread)
7630                   (gnus-summary-find-next unread)))
7631       (unless (zerop (setq n (1- n)))
7632         (gnus-summary-show-thread)))
7633     (when (/= 0 n)
7634       (gnus-message 7 "No more%s articles"
7635                     (if unread " unread" "")))
7636     (unless dont-display
7637       (gnus-summary-recenter)
7638       (gnus-summary-position-point))
7639     n))
7640
7641 (defun gnus-summary-next-unread-subject (n)
7642   "Go to next N'th unread summary line."
7643   (interactive "p")
7644   (gnus-summary-next-subject n t))
7645
7646 (defun gnus-summary-prev-subject (n &optional unread)
7647   "Go to previous N'th summary line.
7648 If optional argument UNREAD is non-nil, only unread article is selected."
7649   (interactive "p")
7650   (gnus-summary-next-subject (- n) unread))
7651
7652 (defun gnus-summary-prev-unread-subject (n)
7653   "Go to previous N'th unread summary line."
7654   (interactive "p")
7655   (gnus-summary-next-subject (- n) t))
7656
7657 (defun gnus-summary-goto-subjects (articles)
7658   "Insert the subject header for ARTICLES in the current buffer."
7659   (save-excursion
7660     (dolist (article articles)
7661       (gnus-summary-goto-subject article t)))
7662   (gnus-summary-limit (append articles gnus-newsgroup-limit))
7663   (gnus-summary-position-point))
7664
7665 (defun gnus-summary-goto-subject (article &optional force silent)
7666   "Go to the subject line of ARTICLE.
7667 If FORCE, also allow jumping to articles not currently shown."
7668   (interactive "nArticle number: ")
7669   (unless (numberp article)
7670     (error "Article %s is not a number" article))
7671   (let ((b (point))
7672         (data (gnus-data-find article)))
7673     ;; We read in the article if we have to.
7674     (and (not data)
7675          force
7676          (gnus-summary-insert-subject
7677           article
7678           (if (or (numberp force) (vectorp force)) force)
7679           t)
7680          (setq data (gnus-data-find article)))
7681     (goto-char b)
7682     (if (not data)
7683         (progn
7684           (unless silent
7685             (gnus-message 3 "Can't find article %d" article))
7686           nil)
7687       (let ((pt (gnus-data-pos data)))
7688         (goto-char pt)
7689         (gnus-summary-set-article-display-arrow pt))
7690       (gnus-summary-position-point)
7691       article)))
7692
7693 ;; Walking around summary lines with displaying articles.
7694
7695 (defun gnus-summary-expand-window (&optional arg)
7696   "Make the summary buffer take up the entire Emacs frame.
7697 Given a prefix, will force an `article' buffer configuration."
7698   (interactive "P")
7699   (if arg
7700       (gnus-configure-windows 'article 'force)
7701     (gnus-configure-windows 'summary 'force)))
7702
7703 (defun gnus-summary-display-article (article &optional all-header)
7704   "Display ARTICLE in article buffer."
7705   (unless (and (gnus-buffer-live-p gnus-article-buffer)
7706                (with-current-buffer gnus-article-buffer
7707                  (derived-mode-p 'gnus-article-mode)))
7708     (gnus-article-setup-buffer))
7709   (gnus-set-global-variables)
7710   (with-current-buffer gnus-article-buffer
7711     (setq gnus-article-charset gnus-newsgroup-charset)
7712     (setq gnus-article-ignored-charsets gnus-newsgroup-ignored-charsets)
7713     (mm-enable-multibyte))
7714   (if (null article)
7715       nil
7716     (prog1
7717         (if gnus-summary-display-article-function
7718             (funcall gnus-summary-display-article-function article all-header)
7719           (gnus-article-prepare article all-header))
7720       (gnus-run-hooks 'gnus-select-article-hook)
7721       (when (and gnus-current-article
7722                  (not (zerop gnus-current-article)))
7723         (gnus-summary-goto-subject gnus-current-article))
7724       (gnus-summary-recenter)
7725       (when (and gnus-use-trees gnus-show-threads)
7726         (gnus-possibly-generate-tree article)
7727         (gnus-highlight-selected-tree article))
7728       ;; Successfully display article.
7729       (gnus-article-set-window-start
7730        (cdr (assq article gnus-newsgroup-bookmarks))))))
7731
7732 (defun gnus-summary-select-article (&optional all-headers force pseudo article)
7733   "Select the current article.
7734 If ALL-HEADERS is non-nil, show all header fields.  If FORCE is
7735 non-nil, the article will be re-fetched even if it already present in
7736 the article buffer.  If PSEUDO is non-nil, pseudo-articles will also
7737 be displayed."
7738   ;; Make sure we are in the summary buffer to work around bbdb bug.
7739   (unless (derived-mode-p 'gnus-summary-mode)
7740     (set-buffer gnus-summary-buffer))
7741   (let ((article (or article (gnus-summary-article-number)))
7742         (all-headers (not (not all-headers))) ;Must be t or nil.
7743         gnus-summary-display-article-function)
7744     (and (not pseudo)
7745          (gnus-summary-article-pseudo-p article)
7746          (error "This is a pseudo-article"))
7747     (with-current-buffer gnus-summary-buffer
7748       (if (or (and gnus-single-article-buffer
7749                    (or (null gnus-current-article)
7750                        (null gnus-article-current)
7751                        (null (get-buffer gnus-article-buffer))
7752                        (not (eq article (cdr gnus-article-current)))
7753                        (not (equal (car gnus-article-current)
7754                                    gnus-newsgroup-name))
7755                        (not (get-buffer gnus-original-article-buffer))))
7756               (and (not gnus-single-article-buffer)
7757                    (or (null gnus-current-article)
7758                        (not (get-buffer gnus-original-article-buffer))
7759                        (not (eq gnus-current-article article))))
7760               force)
7761           ;; The requested article is different from the current article.
7762           (progn
7763             (gnus-summary-display-article article all-headers)
7764             (when (gnus-buffer-live-p gnus-article-buffer)
7765               (with-current-buffer gnus-article-buffer
7766                 (if (not gnus-article-decoded-p) ;; a local variable
7767                     (mm-disable-multibyte))))
7768             (gnus-article-set-window-start
7769              (cdr (assq article gnus-newsgroup-bookmarks)))
7770             article)
7771         'old))))
7772
7773 (defun gnus-summary-force-verify-and-decrypt ()
7774   "Display buttons for signed/encrypted parts and verify/decrypt them."
7775   (interactive)
7776   (let ((mm-verify-option 'known)
7777         (mm-decrypt-option 'known)
7778         (gnus-article-emulate-mime t)
7779         (gnus-buttonized-mime-types (append (list "multipart/signed"
7780                                                   "multipart/encrypted")
7781                                             gnus-buttonized-mime-types)))
7782     (gnus-summary-select-article nil 'force)))
7783
7784 (defun gnus-summary-next-article (&optional unread subject backward push)
7785   "Select the next article.
7786 If UNREAD, only unread articles are selected.
7787 If SUBJECT, only articles with SUBJECT are selected.
7788 If BACKWARD, the previous article is selected instead of the next."
7789   (interactive "P")
7790   ;; Make sure we are in the summary buffer.
7791   (unless (derived-mode-p 'gnus-summary-mode)
7792     (set-buffer gnus-summary-buffer))
7793   (cond
7794    ;; Is there such an article?
7795    ((and (gnus-summary-search-forward unread subject backward)
7796          (or (gnus-summary-display-article (gnus-summary-article-number))
7797              (eq (gnus-summary-article-mark) gnus-canceled-mark)))
7798     (gnus-summary-position-point))
7799    ;; If not, we try the first unread, if that is wanted.
7800    ((and subject
7801          gnus-auto-select-same
7802          (gnus-summary-first-unread-article))
7803     (gnus-summary-position-point)
7804     (gnus-message 6 "Wrapped"))
7805    ;; Try to get next/previous article not displayed in this group.
7806    ((and gnus-auto-extend-newsgroup
7807          (not unread) (not subject))
7808     (gnus-summary-goto-article
7809      (if backward (1- gnus-newsgroup-begin) (1+ gnus-newsgroup-end))
7810      nil (count-lines (point-min) (point))))
7811    ;; Go to next/previous group.
7812    (t
7813     (unless (gnus-ephemeral-group-p gnus-newsgroup-name)
7814       (gnus-summary-jump-to-group gnus-newsgroup-name))
7815     (let ((cmd (if (featurep 'xemacs)
7816                    last-command-char
7817                  last-command-event))
7818           (point
7819            (with-current-buffer gnus-group-buffer
7820              (point)))
7821           (current-summary (current-buffer))
7822           (group
7823            (if (eq gnus-keep-same-level 'best)
7824                (gnus-summary-best-group gnus-newsgroup-name)
7825              (gnus-summary-search-group backward gnus-keep-same-level))))
7826       ;; Select next unread newsgroup automagically.
7827       (cond
7828        ((or (not gnus-auto-select-next)
7829             (not cmd))
7830         (gnus-message 7 "No more%s articles" (if unread " unread" "")))
7831        ((or (eq gnus-auto-select-next 'quietly)
7832             (and (eq gnus-auto-select-next 'slightly-quietly)
7833                  push)
7834             (and (eq gnus-auto-select-next 'almost-quietly)
7835                  (gnus-summary-last-article-p)))
7836         ;; Select quietly.
7837         (if (gnus-ephemeral-group-p gnus-newsgroup-name)
7838             (gnus-summary-exit)
7839           (gnus-message 7 "No more%s articles (%s)..."
7840                         (if unread " unread" "")
7841                         (if group (concat "selecting " group)
7842                           "exiting"))
7843           (gnus-summary-next-group nil group backward)))
7844        (t
7845         (when (gnus-key-press-event-p last-input-event)
7846           ;; Somehow or other, we may now have selected a different
7847           ;; window.  Make point go back to the summary buffer.
7848           (when (eq current-summary (current-buffer))
7849             ;; FIXME: This burps when get-buffer-window returns nil.
7850             (select-window (get-buffer-window current-summary 0)))
7851           (gnus-summary-walk-group-buffer
7852            gnus-newsgroup-name cmd unread backward point))))))))
7853
7854 (defun gnus-summary-walk-group-buffer (from-group cmd unread backward start)
7855   (let ((keystrokes '((?\C-n (gnus-group-next-unread-group 1))
7856                       (?\C-p (gnus-group-prev-unread-group 1))))
7857         (cursor-in-echo-area t)
7858         keve key group ended prompt)
7859     (with-current-buffer gnus-group-buffer
7860       (goto-char start)
7861       (setq group
7862             (if (eq gnus-keep-same-level 'best)
7863                 (gnus-summary-best-group gnus-newsgroup-name)
7864               (gnus-summary-search-group backward gnus-keep-same-level))))
7865     (while (not ended)
7866       (setq prompt
7867             (format
7868              "No more%s articles%s " (if unread " unread" "")
7869              (if (and group
7870                       (not (gnus-ephemeral-group-p gnus-newsgroup-name)))
7871                  (format " (Type %s for %s [%s])"
7872                          (single-key-description cmd)
7873                          (gnus-group-decoded-name group)
7874                          (gnus-group-unread group))
7875                (format " (Type %s to exit %s)"
7876                        (single-key-description cmd)
7877                        (gnus-group-decoded-name gnus-newsgroup-name)))))
7878       ;; Confirm auto selection.
7879       (setq key (car (setq keve (gnus-read-event-char prompt)))
7880             ended t)
7881       (cond
7882        ((assq key keystrokes)
7883         (let ((obuf (current-buffer)))
7884           (switch-to-buffer gnus-group-buffer)
7885           (when group
7886             (gnus-group-jump-to-group group))
7887           (eval (cadr (assq key keystrokes)))
7888           (setq group (gnus-group-group-name))
7889           (switch-to-buffer obuf))
7890         (setq ended nil))
7891        ((equal key cmd)
7892         (if (or (not group)
7893                 (gnus-ephemeral-group-p gnus-newsgroup-name))
7894             (gnus-summary-exit)
7895           (gnus-summary-next-group nil group backward)))
7896        (t
7897         (push (cdr keve) unread-command-events))))))
7898
7899 (defun gnus-summary-next-unread-article ()
7900   "Select unread article after current one."
7901   (interactive)
7902   (gnus-summary-next-article
7903    (or (not (eq gnus-summary-goto-unread 'never))
7904        (gnus-summary-last-article-p (gnus-summary-article-number)))
7905    (and gnus-auto-select-same
7906         (gnus-summary-article-subject))))
7907
7908 (defun gnus-summary-prev-article (&optional unread subject)
7909   "Select the article before the current one.
7910 If UNREAD is non-nil, only unread articles are selected."
7911   (interactive "P")
7912   (gnus-summary-next-article unread subject t))
7913
7914 (defun gnus-summary-prev-unread-article ()
7915   "Select unread article before current one."
7916   (interactive)
7917   (gnus-summary-prev-article
7918    (or (not (eq gnus-summary-goto-unread 'never))
7919        (gnus-summary-first-article-p (gnus-summary-article-number)))
7920    (and gnus-auto-select-same
7921         (gnus-summary-article-subject))))
7922
7923 (declare-function gnus-article-only-boring-p "gnus-art" ())
7924
7925 (defun gnus-summary-next-page (&optional lines circular stop)
7926   "Show next page of the selected article.
7927 If at the end of the current article, select the next article.
7928 LINES says how many lines should be scrolled up.
7929
7930 If CIRCULAR is non-nil, go to the start of the article instead of
7931 selecting the next article when reaching the end of the current
7932 article.
7933
7934 If STOP is non-nil, just stop when reaching the end of the message.
7935
7936 Also see the variable `gnus-article-skip-boring'."
7937   (interactive "P")
7938   (gnus-set-global-variables)
7939   (let ((article (gnus-summary-article-number))
7940         (article-window (get-buffer-window gnus-article-buffer t))
7941         endp)
7942     ;; If the buffer is empty, we have no article.
7943     (unless article
7944       (error "No article to select"))
7945     (gnus-configure-windows 'article)
7946     (if (eq (cdr (assq article gnus-newsgroup-reads)) gnus-canceled-mark)
7947         (if (and (eq gnus-summary-goto-unread 'never)
7948                  (not (gnus-summary-last-article-p article)))
7949             (gnus-summary-next-article)
7950           (gnus-summary-next-unread-article))
7951       (if (or (null gnus-current-article)
7952               (null gnus-article-current)
7953               (/= article (cdr gnus-article-current))
7954               (not (equal (car gnus-article-current) gnus-newsgroup-name)))
7955           ;; Selected subject is different from current article's.
7956           (gnus-summary-display-article article)
7957         (when article-window
7958           (gnus-eval-in-buffer-window gnus-article-buffer
7959             (setq endp (or (gnus-article-next-page lines)
7960                            (gnus-article-only-boring-p))))
7961           (when endp
7962             (cond ((or stop gnus-summary-stop-at-end-of-message)
7963                    (gnus-message 3 "End of message"))
7964                   (circular
7965                    (gnus-summary-beginning-of-article))
7966                   (lines
7967                    (gnus-message 3 "End of message"))
7968                   ((null lines)
7969                    (if (and (eq gnus-summary-goto-unread 'never)
7970                             (not (gnus-summary-last-article-p article)))
7971                        (gnus-summary-next-article)
7972                      (gnus-summary-next-unread-article))))))))
7973     (gnus-summary-recenter)
7974     (gnus-summary-position-point)))
7975
7976 (defun gnus-summary-prev-page (&optional lines move)
7977   "Show previous page of selected article.
7978 Argument LINES specifies lines to be scrolled down.
7979 If MOVE, move to the previous unread article if point is at
7980 the beginning of the buffer."
7981   (interactive "P")
7982   (let ((article (gnus-summary-article-number))
7983         (article-window (get-buffer-window gnus-article-buffer t))
7984         endp)
7985     (gnus-configure-windows 'article)
7986     (if (or (null gnus-current-article)
7987             (null gnus-article-current)
7988             (/= article (cdr gnus-article-current))
7989             (not (equal (car gnus-article-current) gnus-newsgroup-name)))
7990         ;; Selected subject is different from current article's.
7991         (gnus-summary-display-article article)
7992       (gnus-summary-recenter)
7993       (when article-window
7994         (gnus-eval-in-buffer-window gnus-article-buffer
7995           (setq endp (gnus-article-prev-page lines)))
7996         (when (and move endp)
7997           (cond (lines
7998                  (gnus-message 3 "Beginning of message"))
7999                 ((null lines)
8000                  (if (and (eq gnus-summary-goto-unread 'never)
8001                           (not (gnus-summary-first-article-p article)))
8002                      (gnus-summary-prev-article)
8003                    (gnus-summary-prev-unread-article))))))))
8004   (gnus-summary-position-point))
8005
8006 (defun gnus-summary-prev-page-or-article (&optional lines)
8007   "Show previous page of selected article.
8008 Argument LINES specifies lines to be scrolled down.
8009 If at the beginning of the article, go to the next article."
8010   (interactive "P")
8011   (gnus-summary-prev-page lines t))
8012
8013 (defun gnus-summary-scroll-up (lines)
8014   "Scroll up (or down) one line current article.
8015 Argument LINES specifies lines to be scrolled up (or down if negative).
8016 If no article is selected, then the current article will be selected first."
8017   (interactive "p")
8018   (gnus-configure-windows 'article)
8019   (gnus-summary-show-thread)
8020   (when (eq (gnus-summary-select-article nil nil 'pseudo) 'old)
8021     (gnus-eval-in-buffer-window gnus-article-buffer
8022       (cond ((> lines 0)
8023              (when (gnus-article-next-page lines)
8024                (gnus-message 3 "End of message")))
8025             ((< lines 0)
8026              (gnus-article-prev-page (- lines))))))
8027   (gnus-summary-recenter)
8028   (gnus-summary-position-point))
8029
8030 (defun gnus-summary-scroll-down (lines)
8031   "Scroll down (or up) one line current article.
8032 Argument LINES specifies lines to be scrolled down (or up if negative).
8033 If no article is selected, then the current article will be selected first."
8034   (interactive "p")
8035   (gnus-summary-scroll-up (- lines)))
8036
8037 (defun gnus-summary-next-same-subject ()
8038   "Select next article which has the same subject as current one."
8039   (interactive)
8040   (gnus-summary-next-article nil (gnus-summary-article-subject)))
8041
8042 (defun gnus-summary-prev-same-subject ()
8043   "Select previous article which has the same subject as current one."
8044   (interactive)
8045   (gnus-summary-prev-article nil (gnus-summary-article-subject)))
8046
8047 (defun gnus-summary-next-unread-same-subject ()
8048   "Select next unread article which has the same subject as current one."
8049   (interactive)
8050   (gnus-summary-next-article t (gnus-summary-article-subject)))
8051
8052 (defun gnus-summary-prev-unread-same-subject ()
8053   "Select previous unread article which has the same subject as current one."
8054   (interactive)
8055   (gnus-summary-prev-article t (gnus-summary-article-subject)))
8056
8057 (defun gnus-summary-first-unread-article ()
8058   "Select the first unread article.
8059 Return nil if there are no unread articles."
8060   (interactive)
8061   (prog1
8062       (when (gnus-summary-first-subject t)
8063         (gnus-summary-show-thread)
8064         (gnus-summary-first-subject t)
8065         (gnus-summary-display-article (gnus-summary-article-number)))
8066     (gnus-summary-position-point)))
8067
8068 (defun gnus-summary-first-unread-subject ()
8069   "Place the point on the subject line of the first unread article.
8070 Return nil if there are no unread articles."
8071   (interactive)
8072   (prog1
8073       (when (gnus-summary-first-subject t)
8074         (gnus-summary-show-thread)
8075         (gnus-summary-first-subject t))
8076     (gnus-summary-position-point)))
8077
8078 (defun gnus-summary-first-unseen-subject ()
8079   "Place the point on the subject line of the first unseen article.
8080 Return nil if there are no unseen articles."
8081   (interactive)
8082   (prog1
8083       (when (gnus-summary-first-subject nil nil t)
8084         (gnus-summary-show-thread)
8085         (gnus-summary-first-subject nil nil t))
8086     (gnus-summary-position-point)))
8087
8088 (defun gnus-summary-first-unseen-or-unread-subject ()
8089   "Place the point on the subject line of the first unseen and unread article.
8090 If all article have been seen, on the subject line of the first unread
8091 article."
8092   (interactive)
8093   (prog1
8094       (unless (when (gnus-summary-first-subject nil nil t)
8095                 (gnus-summary-show-thread)
8096                 (gnus-summary-first-subject nil nil t))
8097         (when (gnus-summary-first-subject t)
8098           (gnus-summary-show-thread)
8099           (gnus-summary-first-subject t)))
8100     (gnus-summary-position-point)))
8101
8102 (defun gnus-summary-first-article ()
8103   "Select the first article.
8104 Return nil if there are no articles."
8105   (interactive)
8106   (prog1
8107       (when (gnus-summary-first-subject)
8108         (gnus-summary-show-thread)
8109         (gnus-summary-first-subject)
8110         (gnus-summary-display-article (gnus-summary-article-number)))
8111     (gnus-summary-position-point)))
8112
8113 (defun gnus-summary-best-unread-article (&optional arg)
8114   "Select the unread article with the highest score.
8115 If given a prefix argument, select the next unread article that has a
8116 score higher than the default score."
8117   (interactive "P")
8118   (let ((article (if arg
8119                      (gnus-summary-better-unread-subject)
8120                    (gnus-summary-best-unread-subject))))
8121     (if article
8122         (gnus-summary-goto-article article)
8123       (error "No unread articles"))))
8124
8125 (defun gnus-summary-best-unread-subject ()
8126   "Select the unread subject with the highest score."
8127   (interactive)
8128   (let ((best -1000000)
8129         (data gnus-newsgroup-data)
8130         article score)
8131     (while data
8132       (and (gnus-data-unread-p (car data))
8133            (> (setq score
8134                     (gnus-summary-article-score (gnus-data-number (car data))))
8135               best)
8136            (setq best score
8137                  article (gnus-data-number (car data))))
8138       (setq data (cdr data)))
8139     (when article
8140       (gnus-summary-goto-subject article))
8141     (gnus-summary-position-point)
8142     article))
8143
8144 (defun gnus-summary-better-unread-subject ()
8145   "Select the first unread subject that has a score over the default score."
8146   (interactive)
8147   (let ((data gnus-newsgroup-data)
8148         article score)
8149     (while (and (setq article (gnus-data-number (car data)))
8150                 (or (gnus-data-read-p (car data))
8151                     (not (> (gnus-summary-article-score article)
8152                             gnus-summary-default-score))))
8153       (setq data (cdr data)))
8154     (when article
8155       (gnus-summary-goto-subject article))
8156     (gnus-summary-position-point)
8157     article))
8158
8159 (defun gnus-summary-last-subject ()
8160   "Go to the last displayed subject line in the group."
8161   (let ((article (gnus-data-number (car (gnus-data-list t)))))
8162     (when article
8163       (gnus-summary-goto-subject article))))
8164
8165 (defun gnus-summary-goto-article (article &optional all-headers force)
8166   "Fetch ARTICLE (article number or Message-ID) and display it if it exists.
8167 If ALL-HEADERS is non-nil, no header lines are hidden.
8168 If FORCE, go to the article even if it isn't displayed.  If FORCE
8169 is a number, it is the line the article is to be displayed on."
8170   (interactive
8171    (list
8172     (gnus-completing-read
8173      "Article number or Message-ID"
8174      (mapcar 'int-to-string gnus-newsgroup-limit))
8175     current-prefix-arg
8176     t))
8177   (prog1
8178       (if (and (stringp article)
8179                (string-match "@\\|%40" article))
8180           (gnus-summary-refer-article article)
8181         (when (stringp article)
8182           (setq article (string-to-number article)))
8183         (if (gnus-summary-goto-subject article force)
8184             (gnus-summary-display-article article all-headers)
8185           (gnus-message 4 "Couldn't go to article %s" article) nil))
8186     (gnus-summary-position-point)))
8187
8188 (defun gnus-summary-goto-last-article ()
8189   "Go to the previously read article."
8190   (interactive)
8191   (prog1
8192       (when gnus-last-article
8193         (gnus-summary-goto-article gnus-last-article nil t))
8194     (gnus-summary-position-point)))
8195
8196 (defun gnus-summary-pop-article (number)
8197   "Pop one article off the history and go to the previous.
8198 NUMBER articles will be popped off."
8199   (interactive "p")
8200   (let (to)
8201     (setq gnus-newsgroup-history
8202           (cdr (setq to (nthcdr number gnus-newsgroup-history))))
8203     (if to
8204         (gnus-summary-goto-article (car to) nil t)
8205       (error "Article history empty")))
8206   (gnus-summary-position-point))
8207
8208 ;; Summary commands and functions for limiting the summary buffer.
8209
8210 (defun gnus-summary-limit-to-articles (n)
8211   "Limit the summary buffer to the next N articles.
8212 If not given a prefix, use the process marked articles instead."
8213   (interactive "P")
8214   (prog1
8215       (let ((articles (gnus-summary-work-articles n)))
8216         (setq gnus-newsgroup-processable nil)
8217         (gnus-summary-limit articles))
8218     (gnus-summary-position-point)))
8219
8220 (defun gnus-summary-pop-limit (&optional total)
8221   "Restore the previous limit.
8222 If given a prefix, remove all limits."
8223   (interactive "P")
8224   (when total
8225     (setq gnus-newsgroup-limits
8226           (list (mapcar (lambda (h) (mail-header-number h))
8227                         gnus-newsgroup-headers))))
8228   (unless gnus-newsgroup-limits
8229     (error "No limit to pop"))
8230   (prog1
8231       (gnus-summary-limit nil 'pop)
8232     (gnus-summary-position-point)))
8233
8234 (defun gnus-summary-limit-to-subject (subject &optional header not-matching)
8235   "Limit the summary buffer to articles that have subjects that match a regexp.
8236 If NOT-MATCHING, excluding articles that have subjects that match a regexp."
8237   (interactive
8238    (list (read-string (if current-prefix-arg
8239                           "Exclude subject (regexp): "
8240                         "Limit to subject (regexp): "))
8241          nil current-prefix-arg))
8242   (unless header
8243     (setq header "subject"))
8244   (when (not (equal "" subject))
8245     (prog1
8246         (let ((articles (gnus-summary-find-matching
8247                          (or header "subject") subject 'all nil nil
8248                          not-matching)))
8249           (unless articles
8250             (error "Found no matches for \"%s\"" subject))
8251           (gnus-summary-limit articles))
8252       (gnus-summary-position-point))))
8253
8254 (defun gnus-summary-limit-to-author (from &optional not-matching)
8255   "Limit the summary buffer to articles that have authors that match a regexp.
8256 If NOT-MATCHING, excluding articles that have authors that match a regexp."
8257   (interactive
8258    (list (let* ((header (gnus-summary-article-header))
8259                 (default (and header (car (mail-header-parse-address
8260                                            (mail-header-from header))))))
8261            (read-string (concat (if current-prefix-arg
8262                                     "Exclude author (regexp"
8263                                   "Limit to author (regexp")
8264                                 (if default
8265                                     (concat ", default \"" default "\"): ")
8266                                   "): "))
8267                         nil nil
8268                         default))
8269          current-prefix-arg))
8270   (gnus-summary-limit-to-subject from "from" not-matching))
8271
8272 (defun gnus-summary-limit-to-recipient (recipient &optional not-matching)
8273   "Limit the summary buffer to articles with the given RECIPIENT.
8274
8275 If NOT-MATCHING, exclude RECIPIENT.
8276
8277 To and Cc headers are checked.  You need to include them in
8278 `nnmail-extra-headers'."
8279   ;; Unlike `rmail-summary-by-recipients', doesn't include From.
8280   (interactive
8281    (list (read-string (format "%s recipient (regexp): "
8282                               (if current-prefix-arg "Exclude" "Limit to")))
8283          current-prefix-arg))
8284   (when (not (equal "" recipient))
8285     (prog1 (let* ((to
8286                    (if (memq 'To nnmail-extra-headers)
8287                        (gnus-summary-find-matching
8288                         (cons 'extra 'To) recipient 'all nil nil
8289                         not-matching)
8290                      (gnus-message
8291                       1 "`To' isn't present in `nnmail-extra-headers'")
8292                      (sit-for 1)
8293                      nil))
8294                   (cc
8295                    (if (memq 'Cc nnmail-extra-headers)
8296                        (gnus-summary-find-matching
8297                         (cons 'extra 'Cc) recipient 'all nil nil
8298                         not-matching)
8299                      (gnus-message
8300                       1 "`Cc' isn't present in `nnmail-extra-headers'")
8301                      (sit-for 1)
8302                      nil))
8303                   (articles
8304                    (if not-matching
8305                        ;; We need the numbers that are in both lists:
8306                        (mapcar (lambda (a)
8307                                  (and (memq a to) a))
8308                                cc)
8309                      (nconc to cc))))
8310              (unless articles
8311                (error "Found no matches for \"%s\"" recipient))
8312              (gnus-summary-limit articles))
8313       (gnus-summary-position-point))))
8314
8315 (defun gnus-summary-limit-to-address (address &optional not-matching)
8316   "Limit the summary buffer to articles with the given ADDRESS.
8317
8318 If NOT-MATCHING, exclude ADDRESS.
8319
8320 To, Cc and From headers are checked.  You need to include `To' and `Cc'
8321 in `nnmail-extra-headers'."
8322   (interactive
8323    (list (read-string (format "%s address (regexp): "
8324                               (if current-prefix-arg "Exclude" "Limit to")))
8325          current-prefix-arg))
8326   (when (not (equal "" address))
8327     (prog1 (let* ((to
8328                    (if (memq 'To nnmail-extra-headers)
8329                        (gnus-summary-find-matching
8330                         (cons 'extra 'To) address 'all nil nil
8331                         not-matching)
8332                      (gnus-message
8333                       1 "`To' isn't present in `nnmail-extra-headers'")
8334                      (sit-for 1)
8335                      t))
8336                   (cc
8337                    (if (memq 'Cc nnmail-extra-headers)
8338                        (gnus-summary-find-matching
8339                         (cons 'extra 'Cc) address 'all nil nil
8340                         not-matching)
8341                      (gnus-message
8342                       1 "`Cc' isn't present in `nnmail-extra-headers'")
8343                      (sit-for 1)
8344                      t))
8345                   (from
8346                    (gnus-summary-find-matching "from" address
8347                                                'all nil nil not-matching))
8348                   (articles
8349                    (if not-matching
8350                        ;; We need the numbers that are in all lists:
8351                        (if (eq cc t)
8352                            (if (eq to t)
8353                                from
8354                              (mapcar (lambda (a) (car (memq a from))) to))
8355                          (if (eq to t)
8356                              (mapcar (lambda (a) (car (memq a from))) cc)
8357                            (mapcar (lambda (a) (car (memq a from)))
8358                                    (mapcar (lambda (a) (car (memq a to)))
8359                                            cc))))
8360                      (nconc (if (eq to t) nil to)
8361                             (if (eq cc t) nil cc)
8362                             from))))
8363              (unless articles
8364                (error "Found no matches for \"%s\"" address))
8365              (gnus-summary-limit articles))
8366       (gnus-summary-position-point))))
8367
8368 (defun gnus-summary-limit-strange-charsets-predicate (header)
8369   (when (fboundp 'char-charset)
8370     (let ((string (concat (mail-header-subject header)
8371                           (mail-header-from header)))
8372           charset found)
8373       (dotimes (i (1- (length string)))
8374         (setq charset (format "%s" (char-charset (aref string (1+ i)))))
8375         (when (string-match "unicode\\|big\\|japanese" charset)
8376           (setq found t)))
8377       found)))
8378
8379 (defun gnus-summary-limit-to-predicate (predicate)
8380   "Limit to articles where PREDICATE returns non-nil.
8381 PREDICATE will be called with the header structures of the
8382 articles."
8383   (let ((articles nil)
8384         (case-fold-search t))
8385     (dolist (header gnus-newsgroup-headers)
8386       (when (funcall predicate header)
8387         (push (mail-header-number header) articles)))
8388     (gnus-summary-limit (nreverse articles))))
8389
8390 (defun gnus-summary-limit-to-age (age &optional younger-p)
8391   "Limit the summary buffer to articles that are older than (or equal) AGE days.
8392 If YOUNGER-P (the prefix) is non-nil, limit the summary buffer to
8393 articles that are younger than AGE days."
8394   (interactive
8395    (let ((younger current-prefix-arg)
8396          (days-got nil)
8397          days)
8398      (while (not days-got)
8399        (setq days (if younger
8400                       (read-string "Limit to articles younger than (in days, older when negative): ")
8401                     (read-string
8402                      "Limit to articles older than (in days, younger when negative): ")))
8403        (when (> (length days) 0)
8404          (setq days (read days)))
8405        (if (numberp days)
8406            (progn
8407              (setq days-got t)
8408              (when (< days 0)
8409                (setq younger (not younger))
8410                (setq days (* days -1))))
8411          (message "Please enter a number.")
8412          (sleep-for 1)))
8413      (list days younger)))
8414   (prog1
8415       (let ((data gnus-newsgroup-data)
8416             (cutoff (days-to-time age))
8417             articles d date is-younger)
8418         (while (setq d (pop data))
8419           (when (and (vectorp (gnus-data-header d))
8420                      (setq date (mail-header-date (gnus-data-header d))))
8421             (setq is-younger (time-less-p
8422                               (time-since (gnus-date-get-time date))
8423                               cutoff))
8424             (when (if younger-p
8425                       is-younger
8426                     (not is-younger))
8427               (push (gnus-data-number d) articles))))
8428         (gnus-summary-limit (nreverse articles)))
8429     (gnus-summary-position-point)))
8430
8431 (defun gnus-summary-limit-to-extra (header regexp &optional not-matching)
8432   "Limit the summary buffer to articles that match an 'extra' header."
8433   (interactive
8434    (let ((header
8435           (intern
8436            (gnus-completing-read
8437             (if current-prefix-arg
8438                 "Exclude extra header"
8439               "Limit extra header")
8440             (mapcar 'symbol-name gnus-extra-headers)
8441             t nil nil
8442             (symbol-name (car gnus-extra-headers))))))
8443      (list header
8444            (read-string (format "%s header %s (regexp): "
8445                                 (if current-prefix-arg "Exclude" "Limit to")
8446                                 header))
8447            current-prefix-arg)))
8448   (when (not (equal "" regexp))
8449     (prog1
8450         (let ((articles (gnus-summary-find-matching
8451                          (cons 'extra header) regexp 'all nil nil
8452                          not-matching)))
8453           (unless articles
8454             (error "Found no matches for \"%s\"" regexp))
8455           (gnus-summary-limit articles))
8456       (gnus-summary-position-point))))
8457
8458 (defun gnus-summary-limit-to-display-predicate ()
8459   "Limit the summary buffer to the predicated in the `display' group parameter."
8460   (interactive)
8461   (unless gnus-newsgroup-display
8462     (error "There is no `display' group parameter"))
8463   (let (articles)
8464     (dolist (gnus-number gnus-newsgroup-articles)
8465       (when (funcall gnus-newsgroup-display)
8466         (push gnus-number articles)))
8467     (gnus-summary-limit articles))
8468   (gnus-summary-position-point))
8469
8470 (defun gnus-summary-limit-to-unread (&optional all)
8471   "Limit the summary buffer to articles that are not marked as read.
8472 If ALL is non-nil, limit strictly to unread articles."
8473   (interactive "P")
8474   (if all
8475       (gnus-summary-limit-to-marks (char-to-string gnus-unread-mark))
8476     (gnus-summary-limit-to-marks
8477      ;; Concat all the marks that say that an article is read and have
8478      ;; those removed.
8479      (list gnus-del-mark gnus-read-mark gnus-ancient-mark
8480            gnus-killed-mark gnus-spam-mark gnus-kill-file-mark
8481            gnus-low-score-mark gnus-expirable-mark
8482            gnus-canceled-mark gnus-catchup-mark gnus-sparse-mark
8483            gnus-duplicate-mark)
8484      'reverse)))
8485
8486 (defun gnus-summary-limit-to-headers (match &optional reverse)
8487   "Limit the summary buffer to articles that have headers that match MATCH.
8488 If REVERSE (the prefix), limit to articles that don't match."
8489   (interactive "sMatch headers (regexp): \nP")
8490   (gnus-summary-limit-to-bodies match reverse t))
8491
8492 (declare-function article-goto-body "gnus-art" ())
8493
8494 (defun gnus-summary-limit-to-bodies (match &optional reverse headersp)
8495   "Limit the summary buffer to articles that have bodies that match MATCH.
8496 If REVERSE (the prefix), limit to articles that don't match."
8497   (interactive "sMatch body (regexp): \nP")
8498   (let ((articles nil)
8499         (gnus-select-article-hook nil)  ;Disable hook.
8500         (gnus-article-prepare-hook nil)
8501         (gnus-use-article-prefetch nil)
8502         (gnus-keep-backlog nil)
8503         (gnus-break-pages nil)
8504         (gnus-summary-display-arrow nil)
8505         (gnus-updated-mode-lines nil)
8506         (gnus-auto-center-summary nil)
8507         (gnus-display-mime-function nil))
8508     (dolist (data gnus-newsgroup-data)
8509       (let (gnus-mark-article-hook)
8510         (gnus-summary-select-article t t nil (gnus-data-number data)))
8511       (with-current-buffer gnus-article-buffer
8512         (article-goto-body)
8513         (let* ((case-fold-search t)
8514                (found (if headersp
8515                           (re-search-backward match nil t)
8516                         (re-search-forward match nil t))))
8517           (when (or (and found
8518                          (not reverse))
8519                     (and (not found)
8520                          reverse))
8521             (push (gnus-data-number data) articles)))))
8522     (if (not articles)
8523         (message "No messages matched")
8524       (gnus-summary-limit articles)))
8525   (gnus-summary-position-point))
8526
8527 (defun gnus-summary-limit-to-singletons (&optional threadsp)
8528   "Limit the summary buffer to articles that aren't part on any thread.
8529 If THREADSP (the prefix), limit to articles that are in threads."
8530   (interactive "P")
8531   (let ((articles nil)
8532         thread-articles
8533         threads)
8534     (dolist (thread gnus-newsgroup-threads)
8535       (if (stringp (car thread))
8536           (dolist (thread (cdr thread))
8537             (push thread threads))
8538         (push thread threads)))
8539     (dolist (thread threads)
8540       (setq thread-articles (gnus-articles-in-thread thread))
8541       (when (or (and threadsp
8542                      (> (length thread-articles) 1))
8543                 (and (not threadsp)
8544                      (= (length thread-articles) 1)))
8545         (setq articles (nconc thread-articles articles))))
8546     (if (not articles)
8547         (message "No messages matched")
8548       (gnus-summary-limit articles))
8549     (gnus-summary-position-point)))
8550
8551 (defun gnus-summary-limit-to-replied (&optional unreplied)
8552   "Limit the summary buffer to replied articles.
8553 If UNREPLIED (the prefix), limit to unreplied articles."
8554   (interactive "P")
8555   (if unreplied
8556       (gnus-summary-limit
8557        (gnus-set-difference gnus-newsgroup-articles
8558         gnus-newsgroup-replied))
8559     (gnus-summary-limit gnus-newsgroup-replied))
8560   (gnus-summary-position-point))
8561
8562 (defun gnus-summary-limit-exclude-marks (marks &optional reverse)
8563   "Exclude articles that are marked with MARKS (e.g. \"DK\").
8564 If REVERSE, limit the summary buffer to articles that are marked
8565 with MARKS.  MARKS can either be a string of marks or a list of marks.
8566 Returns how many articles were removed."
8567   (interactive "sMarks: ")
8568   (gnus-summary-limit-to-marks marks t))
8569
8570 (defun gnus-summary-limit-to-marks (marks &optional reverse)
8571   "Limit the summary buffer to articles that are marked with MARKS (e.g. \"DK\").
8572 If REVERSE (the prefix), limit the summary buffer to articles that are
8573 not marked with MARKS.  MARKS can either be a string of marks or a
8574 list of marks.
8575 Returns how many articles were removed."
8576   (interactive "sMarks: \nP")
8577   (prog1
8578       (let ((data gnus-newsgroup-data)
8579             (marks (if (listp marks) marks
8580                      (append marks nil))) ; Transform to list.
8581             articles)
8582         (while data
8583           (when (if reverse (not (memq (gnus-data-mark (car data)) marks))
8584                   (memq (gnus-data-mark (car data)) marks))
8585             (push (gnus-data-number (car data)) articles))
8586           (setq data (cdr data)))
8587         (gnus-summary-limit articles))
8588     (gnus-summary-position-point)))
8589
8590 (defun gnus-summary-limit-to-score (score)
8591   "Limit to articles with score at or above SCORE."
8592   (interactive "NLimit to articles with score of at least: ")
8593   (let ((data gnus-newsgroup-data)
8594         articles)
8595     (while data
8596       (when (>= (gnus-summary-article-score (gnus-data-number (car data)))
8597                 score)
8598         (push (gnus-data-number (car data)) articles))
8599       (setq data (cdr data)))
8600     (prog1
8601         (gnus-summary-limit articles)
8602       (gnus-summary-position-point))))
8603
8604 (defun gnus-summary-limit-to-unseen ()
8605   "Limit to unseen articles."
8606   (interactive)
8607   (prog1
8608       (gnus-summary-limit gnus-newsgroup-unseen)
8609     (gnus-summary-position-point)))
8610
8611 (defun gnus-summary-limit-include-thread (id)
8612   "Display all the hidden articles that is in the thread with ID in it.
8613 When called interactively, ID is the Message-ID of the current
8614 article."
8615   (interactive (list (mail-header-id (gnus-summary-article-header))))
8616   (let ((articles (gnus-articles-in-thread
8617                    (gnus-id-to-thread (gnus-root-id id))))
8618         ;;we REALLY want the whole thread---this prevents cut-threads
8619         ;;from removing the thread we want to include.
8620         (gnus-fetch-old-headers nil)
8621         (gnus-build-sparse-threads nil))
8622     (prog1
8623         (gnus-summary-limit (nconc articles gnus-newsgroup-limit))
8624       (gnus-summary-limit-include-matching-articles
8625        "subject"
8626        (regexp-quote (gnus-simplify-subject-re
8627                       (mail-header-subject (gnus-id-to-header id)))))
8628       (gnus-summary-position-point))))
8629
8630 (defun gnus-summary-limit-include-matching-articles (header regexp)
8631   "Display all the hidden articles that have HEADERs that match REGEXP."
8632   (interactive (list (read-string "Match on header: ")
8633                      (read-string "Regexp: ")))
8634   (let ((articles (gnus-find-matching-articles header regexp)))
8635     (prog1
8636         (gnus-summary-limit (nconc articles gnus-newsgroup-limit))
8637       (gnus-summary-position-point))))
8638
8639 (defun gnus-summary-insert-dormant-articles ()
8640   "Insert all the dormant articles for this group into the current buffer."
8641   (interactive)
8642   (let ((gnus-verbose (max 6 gnus-verbose)))
8643     (if (not gnus-newsgroup-dormant)
8644         (gnus-message 3 "No dormant articles for this group")
8645       (gnus-summary-goto-subjects gnus-newsgroup-dormant))))
8646
8647 (defun gnus-summary-insert-ticked-articles ()
8648   "Insert ticked articles for this group into the current buffer."
8649   (interactive)
8650   (let ((gnus-verbose (max 6 gnus-verbose)))
8651     (if (not gnus-newsgroup-marked)
8652         (gnus-message 3 "No ticked articles for this group")
8653       (gnus-summary-goto-subjects gnus-newsgroup-marked))))
8654
8655 (defun gnus-summary-limit-include-dormant ()
8656   "Display all the hidden articles that are marked as dormant.
8657 Note that this command only works on a subset of the articles currently
8658 fetched for this group."
8659   (interactive)
8660   (unless gnus-newsgroup-dormant
8661     (error "There are no dormant articles in this group"))
8662   (prog1
8663       (gnus-summary-limit (append gnus-newsgroup-dormant gnus-newsgroup-limit))
8664     (gnus-summary-position-point)))
8665
8666 (defun gnus-summary-include-articles (articles)
8667   "Fetch the headers for ARTICLES and then display the summary lines."
8668   (let ((gnus-inhibit-demon t)
8669         (gnus-agent nil)
8670         (gnus-read-all-available-headers t))
8671     (setq gnus-newsgroup-headers
8672           (gnus-merge
8673            'list gnus-newsgroup-headers
8674            (gnus-fetch-headers articles nil t)
8675            'gnus-article-sort-by-number))
8676     (setq gnus-newsgroup-articles
8677           (gnus-sorted-nunion gnus-newsgroup-articles articles))
8678     (gnus-summary-limit (append articles gnus-newsgroup-limit))))
8679
8680 (defun gnus-summary-limit-exclude-dormant ()
8681   "Hide all dormant articles."
8682   (interactive)
8683   (prog1
8684       (gnus-summary-limit-to-marks (list gnus-dormant-mark) 'reverse)
8685     (gnus-summary-position-point)))
8686
8687 (defun gnus-summary-limit-exclude-childless-dormant ()
8688   "Hide all dormant articles that have no children."
8689   (interactive)
8690   (let ((data (gnus-data-list t))
8691         articles d children)
8692     ;; Find all articles that are either not dormant or have
8693     ;; children.
8694     (while (setq d (pop data))
8695       (when (or (not (= (gnus-data-mark d) gnus-dormant-mark))
8696                 (and (setq children
8697                            (gnus-article-children (gnus-data-number d)))
8698                      (let (found)
8699                        (while children
8700                          (when (memq (car children) articles)
8701                            (setq children nil
8702                                  found t))
8703                          (pop children))
8704                        found)))
8705         (push (gnus-data-number d) articles)))
8706     ;; Do the limiting.
8707     (prog1
8708         (gnus-summary-limit articles)
8709       (gnus-summary-position-point))))
8710
8711 (defun gnus-summary-limit-mark-excluded-as-read (&optional all)
8712   "Mark all unread excluded articles as read.
8713 If ALL, mark even excluded ticked and dormants as read."
8714   (interactive "P")
8715   (setq gnus-newsgroup-limit (sort gnus-newsgroup-limit '<))
8716   (let ((articles (gnus-sorted-ndifference
8717                    (sort
8718                     (mapcar (lambda (h) (mail-header-number h))
8719                             gnus-newsgroup-headers)
8720                     '<)
8721                    gnus-newsgroup-limit))
8722         article)
8723     (setq gnus-newsgroup-unreads
8724           (gnus-sorted-intersection gnus-newsgroup-unreads
8725                                     gnus-newsgroup-limit))
8726     (if all
8727         (setq gnus-newsgroup-dormant nil
8728               gnus-newsgroup-marked nil
8729               gnus-newsgroup-reads
8730               (nconc
8731                (mapcar (lambda (n) (cons n gnus-catchup-mark)) articles)
8732                gnus-newsgroup-reads))
8733       (while (setq article (pop articles))
8734         (unless (or (memq article gnus-newsgroup-dormant)
8735                     (memq article gnus-newsgroup-marked))
8736           (push (cons article gnus-catchup-mark) gnus-newsgroup-reads))))))
8737
8738 (defun gnus-summary-limit (articles &optional pop)
8739   (if pop
8740       ;; We pop the previous limit off the stack and use that.
8741       (setq articles (car gnus-newsgroup-limits)
8742             gnus-newsgroup-limits (cdr gnus-newsgroup-limits))
8743     ;; We use the new limit, so we push the old limit on the stack.
8744     (push gnus-newsgroup-limit gnus-newsgroup-limits))
8745   ;; Set the limit.
8746   (setq gnus-newsgroup-limit articles)
8747   (let ((total (length gnus-newsgroup-data))
8748         (data (gnus-data-find-list (gnus-summary-article-number)))
8749         (gnus-summary-mark-below nil)   ; Inhibit this.
8750         found)
8751     ;; This will do all the work of generating the new summary buffer
8752     ;; according to the new limit.
8753     (gnus-summary-prepare)
8754     ;; Hide any threads, possibly.
8755     (gnus-summary-maybe-hide-threads)
8756     ;; Try to return to the article you were at, or one in the
8757     ;; neighborhood.
8758     (when data
8759       ;; We try to find some article after the current one.
8760       (while data
8761         (when (gnus-summary-goto-subject (gnus-data-number (car data)) nil t)
8762           (setq data nil
8763                 found t))
8764         (setq data (cdr data))))
8765     (unless found
8766       ;; If there is no data, that means that we were after the last
8767       ;; article.  The same goes when we can't find any articles
8768       ;; after the current one.
8769       (goto-char (point-max))
8770       (gnus-summary-find-prev))
8771     (gnus-set-mode-line 'summary)
8772     ;; We return how many articles were removed from the summary
8773     ;; buffer as a result of the new limit.
8774     (- total (length gnus-newsgroup-data))))
8775
8776 (defsubst gnus-invisible-cut-children (threads)
8777   (let ((num 0))
8778     (while threads
8779       (when (memq (mail-header-number (caar threads)) gnus-newsgroup-limit)
8780         (incf num))
8781       (pop threads))
8782     (< num 2)))
8783
8784 (defsubst gnus-cut-thread (thread)
8785   "Go forwards in the thread until we find an article that we want to display."
8786   (when (or (eq gnus-fetch-old-headers 'some)
8787             (eq gnus-fetch-old-headers 'invisible)
8788             (numberp gnus-fetch-old-headers)
8789             (eq gnus-build-sparse-threads 'some)
8790             (eq gnus-build-sparse-threads 'more))
8791     ;; Deal with old-fetched headers and sparse threads.
8792     (while (and
8793             thread
8794             (or
8795              (gnus-summary-article-sparse-p (mail-header-number (car thread)))
8796              (gnus-summary-article-ancient-p
8797               (mail-header-number (car thread))))
8798             (if (or (<= (length (cdr thread)) 1)
8799                     (eq gnus-fetch-old-headers 'invisible))
8800                 (setq gnus-newsgroup-limit
8801                       (delq (mail-header-number (car thread))
8802                             gnus-newsgroup-limit)
8803                       thread (cadr thread))
8804               (when (gnus-invisible-cut-children (cdr thread))
8805                 (let ((th (cdr thread)))
8806                   (while th
8807                     (if (memq (mail-header-number (caar th))
8808                               gnus-newsgroup-limit)
8809                         (setq thread (car th)
8810                               th nil)
8811                       (setq th (cdr th))))))))))
8812   thread)
8813
8814 (defun gnus-cut-threads (threads)
8815   "Cut off all uninteresting articles from the beginning of THREADS."
8816   (when (or (eq gnus-fetch-old-headers 'some)
8817             (eq gnus-fetch-old-headers 'invisible)
8818             (numberp gnus-fetch-old-headers)
8819             (eq gnus-build-sparse-threads 'some)
8820             (eq gnus-build-sparse-threads 'more))
8821     (let ((th threads))
8822       (while th
8823         (setcar th (gnus-cut-thread (car th)))
8824         (setq th (cdr th)))))
8825   ;; Remove nixed out threads.
8826   (delq nil threads))
8827
8828 (defun gnus-summary-initial-limit (&optional show-if-empty)
8829   "Figure out what the initial limit is supposed to be on group entry.
8830 This entails weeding out unwanted dormants, low-scored articles,
8831 fetch-old-headers verbiage, and so on."
8832   ;; Most groups have nothing to remove.
8833   (unless (or gnus-inhibit-limiting
8834               (and (null gnus-newsgroup-dormant)
8835                    (eq gnus-newsgroup-display 'gnus-not-ignore)
8836                    (not (eq gnus-fetch-old-headers 'some))
8837                    (not (numberp gnus-fetch-old-headers))
8838                    (not (eq gnus-fetch-old-headers 'invisible))
8839                    (null gnus-summary-expunge-below)
8840                    (not (eq gnus-build-sparse-threads 'some))
8841                    (not (eq gnus-build-sparse-threads 'more))
8842                    (null gnus-thread-expunge-below)))
8843     (push gnus-newsgroup-limit gnus-newsgroup-limits)
8844     (setq gnus-newsgroup-limit nil)
8845     (mapatoms
8846      (lambda (node)
8847        (unless (car (symbol-value node))
8848          ;; These threads have no parents -- they are roots.
8849          (let ((nodes (cdr (symbol-value node)))
8850                thread)
8851            (while nodes
8852              (if (and gnus-thread-expunge-below
8853                       (< (gnus-thread-total-score (car nodes))
8854                          gnus-thread-expunge-below))
8855                  (gnus-expunge-thread (pop nodes))
8856                (setq thread (pop nodes))
8857                (gnus-summary-limit-children thread))))))
8858      gnus-newsgroup-dependencies)
8859     ;; If this limitation resulted in an empty group, we might
8860     ;; pop the previous limit and use it instead.
8861     (when (and (not gnus-newsgroup-limit)
8862                show-if-empty)
8863       (setq gnus-newsgroup-limit (pop gnus-newsgroup-limits)))
8864     gnus-newsgroup-limit))
8865
8866 (defun gnus-summary-limit-children (thread)
8867   "Return 1 if this subthread is visible and 0 if it is not."
8868   ;; First we get the number of visible children to this thread.  This
8869   ;; is done by recursing down the thread using this function, so this
8870   ;; will really go down to a leaf article first, before slowly
8871   ;; working its way up towards the root.
8872   (when thread
8873     (let* ((max-lisp-eval-depth (max 5000 max-lisp-eval-depth))
8874            (children
8875            (if (cdr thread)
8876                (apply '+ (mapcar 'gnus-summary-limit-children
8877                                  (cdr thread)))
8878              0))
8879            (number (mail-header-number (car thread)))
8880            score)
8881       (if (and
8882            (not (memq number gnus-newsgroup-marked))
8883            (or
8884             ;; If this article is dormant and has absolutely no visible
8885             ;; children, then this article isn't visible.
8886             (and (memq number gnus-newsgroup-dormant)
8887                  (zerop children))
8888             ;; If this is "fetch-old-headered" and there is no
8889             ;; visible children, then we don't want this article.
8890             (and (or (eq gnus-fetch-old-headers 'some)
8891                      (numberp gnus-fetch-old-headers))
8892                  (gnus-summary-article-ancient-p number)
8893                  (zerop children))
8894             ;; If this is "fetch-old-headered" and `invisible', then
8895             ;; we don't want this article.
8896             (and (eq gnus-fetch-old-headers 'invisible)
8897                  (gnus-summary-article-ancient-p number))
8898             ;; If this is a sparsely inserted article with no children,
8899             ;; we don't want it.
8900             (and (eq gnus-build-sparse-threads 'some)
8901                  (gnus-summary-article-sparse-p number)
8902                  (zerop children))
8903             ;; If we use expunging, and this article is really
8904             ;; low-scored, then we don't want this article.
8905             (when (and gnus-summary-expunge-below
8906                        (< (setq score
8907                                 (or (cdr (assq number gnus-newsgroup-scored))
8908                                     gnus-summary-default-score))
8909                           gnus-summary-expunge-below))
8910               ;; We increase the expunge-tally here, but that has
8911               ;; nothing to do with the limits, really.
8912               (incf gnus-newsgroup-expunged-tally)
8913               ;; We also mark as read here, if that's wanted.
8914               (when (and gnus-summary-mark-below
8915                          (< score gnus-summary-mark-below))
8916                 (setq gnus-newsgroup-unreads
8917                       (delq number gnus-newsgroup-unreads))
8918                 (if gnus-newsgroup-auto-expire
8919                     (push number gnus-newsgroup-expirable)
8920                   (push (cons number gnus-low-score-mark)
8921                         gnus-newsgroup-reads)))
8922               t)
8923             ;; Do the `display' group parameter.
8924             (and gnus-newsgroup-display
8925                  (let ((gnus-number number))
8926                    (not (funcall gnus-newsgroup-display))))))
8927           ;; Nope, invisible article.
8928           0
8929         ;; Ok, this article is to be visible, so we add it to the limit
8930         ;; and return 1.
8931         (push number gnus-newsgroup-limit)
8932         1))))
8933
8934 (defun gnus-expunge-thread (thread)
8935   "Mark all articles in THREAD as read."
8936   (let* ((number (mail-header-number (car thread))))
8937     (incf gnus-newsgroup-expunged-tally)
8938     ;; We also mark as read here, if that's wanted.
8939     (setq gnus-newsgroup-unreads
8940           (delq number gnus-newsgroup-unreads))
8941     (if gnus-newsgroup-auto-expire
8942         (push number gnus-newsgroup-expirable)
8943       (push (cons number gnus-low-score-mark)
8944             gnus-newsgroup-reads)))
8945   ;; Go recursively through all subthreads.
8946   (mapcar 'gnus-expunge-thread (cdr thread)))
8947
8948 ;; Summary article oriented commands
8949
8950 (defun gnus-summary-refer-parent-article (n)
8951   "Refer parent article N times.
8952 If N is negative, go to ancestor -N instead.
8953 The difference between N and the number of articles fetched is returned."
8954   (interactive "p")
8955   (let ((skip 1)
8956         error header ref)
8957     (when (not (natnump n))
8958       (setq skip (abs n)
8959             n 1))
8960     (while (and (> n 0)
8961                 (not error))
8962       (setq header (gnus-summary-article-header))
8963       (if (and (eq (mail-header-number header)
8964                    (cdr gnus-article-current))
8965                (equal gnus-newsgroup-name
8966                       (car gnus-article-current)))
8967           ;; If we try to find the parent of the currently
8968           ;; displayed article, then we take a look at the actual
8969           ;; References header, since this is slightly more
8970           ;; reliable than the References field we got from the
8971           ;; server.
8972           (with-current-buffer gnus-original-article-buffer
8973             (nnheader-narrow-to-headers)
8974             (unless (setq ref (message-fetch-field "references"))
8975               (when (setq ref (message-fetch-field "in-reply-to"))
8976                 (setq ref (gnus-extract-message-id-from-in-reply-to ref))))
8977             (widen))
8978         (setq ref
8979               ;; It's not the current article, so we take a bet on
8980               ;; the value we got from the server.
8981               (mail-header-references header)))
8982       (if (and ref
8983                (not (equal ref "")))
8984           (unless (gnus-summary-refer-article (gnus-parent-id ref skip))
8985             (gnus-message 1 "Couldn't find parent"))
8986         (gnus-message 1 "No references in article %d"
8987                       (gnus-summary-article-number))
8988         (setq error t))
8989       (decf n))
8990     (gnus-summary-position-point)
8991     n))
8992
8993 (defun gnus-summary-refer-references ()
8994   "Fetch all articles mentioned in the References header.
8995 Return the number of articles fetched."
8996   (interactive)
8997   (let ((ref (mail-header-references (gnus-summary-article-header)))
8998         (current (gnus-summary-article-number))
8999         (n 0))
9000     (if (or (not ref)
9001             (equal ref ""))
9002         (error "No References in the current article")
9003       ;; For each Message-ID in the References header...
9004       (while (string-match "<[^>]*>" ref)
9005         (incf n)
9006         ;; ... fetch that article.
9007         (gnus-summary-refer-article
9008          (prog1 (match-string 0 ref)
9009            (setq ref (substring ref (match-end 0))))))
9010       (gnus-summary-goto-subject current)
9011       (gnus-summary-position-point)
9012       n)))
9013
9014 (defun gnus-delete-duplicate-headers (headers)
9015   ;; First remove leading duplicates.
9016   (while (and (> (length headers) 1)
9017               (= (mail-header-number (car headers))
9018                  (mail-header-number (cadr headers))))
9019     (pop headers))
9020   ;; Then the rest.
9021   (let ((result headers))
9022     (while (> (length headers) 1)
9023       (if (= (mail-header-number (car headers))
9024              (mail-header-number (cadr headers)))
9025           (setcdr headers (cddr headers))
9026         (pop headers)))
9027     result))
9028
9029 (defun gnus-summary-refer-thread (&optional limit)
9030   "Fetch all articles in the current thread. For backends that
9031 know how to search for threads (currently only 'nnimap) a
9032 non-numeric prefix arg will use nnir to search the entire
9033 server; without a prefix arg only the current group is
9034 searched. If the variable `gnus-refer-thread-use-nnir' is
9035 non-nil the prefix arg has the reverse meaning. If no
9036 backend-specific 'request-thread function is available fetch
9037 LIMIT (the numerical prefix) old headers. If LIMIT is
9038 non-numeric or nil fetch the number specified by the
9039 `gnus-refer-thread-limit' variable."
9040   (interactive "P")
9041   (gnus-warp-to-article)
9042   (let* ((header (gnus-summary-article-header))
9043          (id (mail-header-id header))
9044          (gnus-inhibit-demon t)
9045          (gnus-summary-ignore-duplicates t)
9046          (gnus-read-all-available-headers t)
9047          (gnus-refer-thread-use-nnir
9048           (if (and (not (null limit)) (listp limit))
9049               (not gnus-refer-thread-use-nnir) gnus-refer-thread-use-nnir))
9050          (new-headers
9051           (if (gnus-check-backend-function
9052                'request-thread gnus-newsgroup-name)
9053               (gnus-request-thread header gnus-newsgroup-name)
9054             (let* ((limit (if (numberp limit) (prefix-numeric-value limit)
9055                             gnus-refer-thread-limit))
9056                    (last (if (numberp limit)
9057                              (min (+ (mail-header-number header)
9058                                      limit)
9059                                   gnus-newsgroup-highest)
9060                            gnus-newsgroup-highest))
9061                    (subject (gnus-simplify-subject
9062                              (mail-header-subject header)))
9063                    (refs (split-string (or (mail-header-references header)
9064                                            "")))
9065                    (gnus-parse-headers-hook
9066                     `(lambda () (goto-char (point-min))
9067                       (keep-lines
9068                        (regexp-opt ',(append refs (list id subject)))))))
9069               (gnus-fetch-headers (list last) (if (numberp limit)
9070                                                   (* 2 limit) limit) t))))
9071          article-ids)
9072     (when (listp new-headers)
9073       (dolist (header new-headers)
9074         (push (mail-header-number header) article-ids)
9075         (when (member (mail-header-number header) gnus-newsgroup-unselected)
9076           (push (mail-header-number header) gnus-newsgroup-unreads)
9077           (setq gnus-newsgroup-unselected
9078                 (delete (mail-header-number header)
9079                         gnus-newsgroup-unselected))))
9080       (setq gnus-newsgroup-headers
9081             (gnus-delete-duplicate-headers
9082              (gnus-merge
9083               'list gnus-newsgroup-headers new-headers
9084               'gnus-article-sort-by-number)))
9085       (setq gnus-newsgroup-articles
9086             (gnus-sorted-nunion gnus-newsgroup-articles (nreverse article-ids)))
9087       (gnus-summary-limit-include-thread id)))
9088   (gnus-summary-show-thread))
9089
9090 (defun gnus-summary-open-group-with-article (message-id)
9091   "Open a group containing the article with the given MESSAGE-ID."
9092   (interactive "sMessage-ID: ")
9093   (require 'nndoc)
9094   (with-temp-buffer
9095     ;; Prepare a dummy article
9096     (erase-buffer)
9097     (insert "From nobody Tue Sep 13 22:05:34 2011\n\n")
9098
9099     ;; Prepare pretty modelines for summary and article buffers
9100     (let ((gnus-summary-mode-line-format "Found %G")
9101           (gnus-article-mode-line-format
9102            ;; Group names just get in the way here, especially the
9103            ;; abbreviated ones
9104            (if (string-match "%[gG]" gnus-article-mode-line-format)
9105                (concat (substring gnus-article-mode-line-format
9106                                   0 (match-beginning 0))
9107                        (substring gnus-article-mode-line-format (match-end 0)))
9108              gnus-article-mode-line-format)))
9109
9110       ;; Build an ephemeral group containing the dummy article (hidden)
9111       (gnus-group-read-ephemeral-group
9112        message-id
9113        `(nndoc ,message-id
9114                (nndoc-address ,(current-buffer))
9115                (nndoc-article-type mbox))
9116        :activate
9117        (cons (current-buffer) gnus-current-window-configuration)
9118        (not :request-only)
9119        '(-1)                            ; :select-articles
9120        (not :parameters)
9121        0))                              ; :number
9122     ;; Fetch the desired article
9123     (gnus-summary-refer-article message-id)))
9124
9125 (defun gnus-summary-refer-article (message-id)
9126   "Fetch an article specified by MESSAGE-ID."
9127   (interactive "sMessage-ID: ")
9128   (gnus-warp-to-article)
9129   (when (and (stringp message-id)
9130              (not (zerop (length message-id))))
9131     (setq message-id (gnus-replace-in-string message-id " " ""))
9132     ;; Construct the correct Message-ID if necessary.
9133     ;; Suggested by tale@pawl.rpi.edu.
9134     (unless (string-match "^<" message-id)
9135       (setq message-id (concat "<" message-id)))
9136     (unless (string-match ">$" message-id)
9137       (setq message-id (concat message-id ">")))
9138     ;; People often post MIDs from URLs, so unhex it:
9139     (unless (string-match "@" message-id)
9140       (setq message-id (gnus-url-unhex-string message-id)))
9141     (let* ((header (gnus-id-to-header message-id))
9142            (sparse (and header
9143                         (gnus-summary-article-sparse-p
9144                          (mail-header-number header))
9145                         (memq (mail-header-number header)
9146                               gnus-newsgroup-limit)))
9147            number)
9148       (cond
9149        ;; If the article is present in the buffer we just go to it.
9150        ((and header
9151              (or (not (gnus-summary-article-sparse-p
9152                        (mail-header-number header)))
9153                  sparse))
9154         (prog1
9155             (gnus-summary-goto-article
9156              (mail-header-number header) nil t)
9157           (when sparse
9158             (gnus-summary-update-article (mail-header-number header)))))
9159        (t
9160         ;; We fetch the article.
9161         (catch 'found
9162           (dolist (gnus-override-method (gnus-refer-article-methods))
9163             (when (and (gnus-check-server gnus-override-method)
9164                        ;; Fetch the header,
9165                        (setq number (gnus-summary-insert-subject message-id)))
9166               ;; and display the article.
9167               (gnus-summary-select-article nil nil nil number)
9168               (throw 'found t)))
9169           (gnus-message 3 "Couldn't fetch article %s" message-id)))))))
9170
9171 (defun gnus-refer-article-methods ()
9172   "Return a list of referable methods."
9173   (cond
9174    ;; No method, so we default to current and native.
9175    ((null gnus-refer-article-method)
9176     (list gnus-current-select-method gnus-select-method))
9177    ;; Current.
9178    ((eq 'current gnus-refer-article-method)
9179     (list gnus-current-select-method))
9180    ;; List of select methods.
9181    ((not (and (symbolp (car gnus-refer-article-method))
9182               (assq (car gnus-refer-article-method) nnoo-definition-alist)))
9183     (let (out)
9184       (dolist (method gnus-refer-article-method)
9185         (push (if (eq 'current method)
9186                   gnus-current-select-method
9187                 (if (eq 'nnir (car method))
9188                     (list
9189                      'nnir
9190                      (or (cadr method)
9191                          (gnus-method-to-server gnus-current-select-method)))
9192                   method))
9193               out))
9194       (nreverse out)))
9195    ;; One single select method.
9196    (t
9197     (list gnus-refer-article-method))))
9198
9199 (defun gnus-summary-edit-parameters ()
9200   "Edit the group parameters of the current group."
9201   (interactive)
9202   (gnus-group-edit-group gnus-newsgroup-name 'params))
9203
9204 (defun gnus-summary-customize-parameters ()
9205   "Customize the group parameters of the current group."
9206   (interactive)
9207   (gnus-group-customize gnus-newsgroup-name))
9208
9209 (defun gnus-summary-enter-digest-group (&optional force)
9210   "Enter an nndoc group based on the current article.
9211 If FORCE, force a digest interpretation.  If not, try to guess
9212 what the document format is.
9213
9214 To control what happens when you exit the group, see the
9215 `gnus-auto-select-on-ephemeral-exit' variable."
9216   (interactive "P")
9217   (let ((conf gnus-current-window-configuration))
9218     (save-window-excursion
9219       (save-excursion
9220         (let (gnus-article-prepare-hook
9221               gnus-display-mime-function
9222               gnus-break-pages)
9223           (gnus-summary-select-article))))
9224     (setq gnus-current-window-configuration conf)
9225     (let* ((name (format "%s-%d"
9226                          (gnus-group-prefixed-name
9227                           gnus-newsgroup-name (list 'nndoc ""))
9228                          (with-current-buffer gnus-summary-buffer
9229                            gnus-current-article)))
9230            (ogroup gnus-newsgroup-name)
9231            (params (append (gnus-info-params (gnus-get-info ogroup))
9232                            (list (cons 'to-group ogroup))
9233                            (list (cons 'parent-group ogroup))
9234                            (list (cons 'save-article-group ogroup))))
9235            (case-fold-search t)
9236            (buf (current-buffer))
9237            dig to-address charset)
9238       (with-current-buffer gnus-original-article-buffer
9239         ;; Have the digest group inherit the main mail address of
9240         ;; the parent article.
9241         (when (setq to-address (or (gnus-fetch-field "reply-to")
9242                                    (gnus-fetch-field "from")))
9243           (setq params
9244                 (append
9245                  params
9246                  (list (cons 'to-address
9247                              (funcall gnus-decode-encoded-address-function
9248                                       to-address))))))
9249         (setq dig (nnheader-set-temp-buffer " *gnus digest buffer*"))
9250         (insert-buffer-substring gnus-original-article-buffer)
9251         (narrow-to-region
9252          (goto-char (point-min))
9253          (or (search-forward "\n\n" nil t) (point)))
9254         ;; Remove lines that may lead nndoc to misinterpret the
9255         ;; document type.
9256         (goto-char (point-min))
9257         (delete-matching-lines "^Path:\\|^From ")
9258         ;; Parse charset, and decode content transfer encoding.
9259         (setq charset (mail-content-type-get
9260                        (mail-header-parse-content-type
9261                         (or (gnus-fetch-field "content-type") ""))
9262                        'charset))
9263         (let ((encoding (gnus-fetch-field "content-transfer-encoding")))
9264           (when encoding
9265             (message-remove-header "content-transfer-encoding")
9266             (goto-char (point-max))
9267             (widen)
9268             (narrow-to-region (point) (point-max))
9269             (mm-decode-content-transfer-encoding
9270              (intern (downcase (mail-header-strip encoding))))))
9271         (widen))
9272       (unwind-protect
9273           (if (let ((gnus-newsgroup-ephemeral-charset
9274                      (if charset
9275                          (intern (downcase (gnus-strip-whitespace charset)))
9276                        gnus-newsgroup-charset))
9277                     (gnus-newsgroup-ephemeral-ignored-charsets
9278                      gnus-newsgroup-ignored-charsets))
9279                 (gnus-group-read-ephemeral-group
9280                  name `(nndoc ,name (nndoc-address ,(get-buffer dig))
9281                               (nndoc-article-type
9282                                ,(if force 'mbox 'guess)))
9283                  t nil nil nil
9284                  `((adapt-file . ,(gnus-score-file-name gnus-newsgroup-name
9285                                                         "ADAPT")))))
9286               ;; Make all postings to this group go to the parent group.
9287               (nconc (gnus-info-params (gnus-get-info name))
9288                      params)
9289             ;; Couldn't select this doc group.
9290             (switch-to-buffer buf)
9291             (gnus-set-global-variables)
9292             (gnus-configure-windows 'summary)
9293             (gnus-message 3 "Article couldn't be entered?"))
9294         (kill-buffer dig)))))
9295
9296 (defun gnus-summary-read-document (n)
9297   "Open a new group based on the current article(s).
9298 This will allow you to read digests and other similar
9299 documents as newsgroups.
9300 Obeys the standard process/prefix convention."
9301   (interactive "P")
9302   (let* ((ogroup gnus-newsgroup-name)
9303          (params (append (gnus-info-params (gnus-get-info ogroup))
9304                          (list (cons 'to-group ogroup))))
9305          group egroup groups vgroup)
9306     (dolist (article (gnus-summary-work-articles n))
9307       (setq group (format "%s-%d" gnus-newsgroup-name article))
9308       (gnus-summary-remove-process-mark article)
9309       (when (gnus-summary-display-article article)
9310         (save-excursion ;;What for?
9311           (with-temp-buffer
9312             (insert-buffer-substring gnus-original-article-buffer)
9313             ;; Remove some headers that may lead nndoc to make
9314             ;; the wrong guess.
9315             (message-narrow-to-head)
9316             (goto-char (point-min))
9317             (delete-matching-lines "^Path:\\|^From ")
9318             (widen)
9319             (if (setq egroup
9320                       (gnus-group-read-ephemeral-group
9321                        group `(nndoc ,group (nndoc-address ,(current-buffer))
9322                                      (nndoc-article-type guess))
9323                        t nil t))
9324                 (progn
9325                   ;; Make all postings to this group go to the parent group.
9326                   (nconc (gnus-info-params (gnus-get-info egroup))
9327                          params)
9328                   (push egroup groups))
9329               ;; Couldn't select this doc group.
9330               (gnus-error 3 "Article couldn't be entered"))))))
9331     ;; Now we have selected all the documents.
9332     (cond
9333      ((not groups)
9334       (error "None of the articles could be interpreted as documents"))
9335      ((gnus-group-read-ephemeral-group
9336        (setq vgroup (format
9337                      "nnvirtual:%s-%s" gnus-newsgroup-name
9338                      (format-time-string "%Y%m%dT%H%M%S")))
9339        `(nnvirtual ,vgroup (nnvirtual-component-groups ,groups))
9340        t
9341        (cons (current-buffer) 'summary)))
9342      (t
9343       (error "Couldn't select virtual nndoc group")))))
9344
9345 (defun gnus-summary-widget-forward (arg)
9346   "Move point to the next field or button in the article.
9347 With optional ARG, move across that many fields."
9348   (interactive "p")
9349   (gnus-summary-select-article)
9350   (gnus-configure-windows 'article)
9351   (select-window (gnus-get-buffer-window gnus-article-buffer))
9352   (widget-forward arg))
9353
9354 (defun gnus-summary-widget-backward (arg)
9355   "Move point to the previous field or button in the article.
9356 With optional ARG, move across that many fields."
9357   (interactive "p")
9358   (gnus-summary-select-article)
9359   (gnus-configure-windows 'article)
9360   (select-window (gnus-get-buffer-window gnus-article-buffer))
9361   (unless (widget-at (point))
9362     (goto-char (point-max)))
9363   (widget-backward arg))
9364
9365 (defun gnus-summary-isearch-article (&optional regexp-p)
9366   "Do incremental search forward on the current article.
9367 If REGEXP-P (the prefix) is non-nil, do regexp isearch."
9368   (interactive "P")
9369   (gnus-summary-select-article)
9370   (gnus-configure-windows 'article)
9371   (gnus-eval-in-buffer-window gnus-article-buffer
9372     (save-restriction
9373       (widen)
9374       (isearch-forward regexp-p))))
9375
9376 (defun gnus-summary-repeat-search-article-forward ()
9377   "Repeat the previous search forwards."
9378   (interactive)
9379   (unless gnus-last-search-regexp
9380     (error "No previous search"))
9381   (gnus-summary-search-article-forward gnus-last-search-regexp))
9382
9383 (defun gnus-summary-repeat-search-article-backward ()
9384   "Repeat the previous search backwards."
9385   (interactive)
9386   (unless gnus-last-search-regexp
9387     (error "No previous search"))
9388   (gnus-summary-search-article-forward gnus-last-search-regexp t))
9389
9390 (defun gnus-summary-search-article-forward (regexp &optional backward)
9391   "Search for an article containing REGEXP forward.
9392 If BACKWARD, search backward instead."
9393   (interactive
9394    (list (read-string
9395           (format "Search article %s (regexp%s): "
9396                   (if current-prefix-arg "backward" "forward")
9397                   (if gnus-last-search-regexp
9398                       (concat ", default " gnus-last-search-regexp)
9399                     "")))
9400          current-prefix-arg))
9401   (if (string-equal regexp "")
9402       (setq regexp (or gnus-last-search-regexp ""))
9403     (setq gnus-last-search-regexp regexp)
9404     (setq gnus-article-before-search gnus-current-article))
9405   ;; Intentionally set gnus-last-article.
9406   (setq gnus-last-article gnus-article-before-search)
9407   (let ((gnus-last-article gnus-last-article))
9408     (if (gnus-summary-search-article regexp backward)
9409         (gnus-summary-show-thread)
9410       (signal 'search-failed (list regexp)))))
9411
9412 (defun gnus-summary-search-article-backward (regexp)
9413   "Search for an article containing REGEXP backward."
9414   (interactive
9415    (list (read-string
9416           (format "Search article backward (regexp%s): "
9417                   (if gnus-last-search-regexp
9418                       (concat ", default " gnus-last-search-regexp)
9419                     "")))))
9420   (gnus-summary-search-article-forward regexp 'backward))
9421
9422 (defun gnus-summary-search-article (regexp &optional backward)
9423   "Search for an article containing REGEXP.
9424 Optional argument BACKWARD means do search for backward.
9425 `gnus-select-article-hook' is not called during the search."
9426   ;; We have to require this here to make sure that the following
9427   ;; dynamic binding isn't shadowed by autoloading.
9428   (require 'gnus-async)
9429   (require 'gnus-art)
9430   (let ((gnus-select-article-hook nil)  ;Disable hook.
9431         (gnus-article-prepare-hook nil)
9432         (gnus-mark-article-hook nil)    ;Inhibit marking as read.
9433         (gnus-use-article-prefetch nil)
9434         (gnus-xmas-force-redisplay nil) ;Inhibit XEmacs redisplay.
9435         (gnus-use-trees nil)            ;Inhibit updating tree buffer.
9436         (gnus-visual nil)
9437         (gnus-keep-backlog nil)
9438         (gnus-break-pages nil)
9439         (gnus-summary-display-arrow nil)
9440         (gnus-updated-mode-lines nil)
9441         (gnus-auto-center-summary nil)
9442         (sum (current-buffer))
9443         (gnus-display-mime-function nil)
9444         (found nil)
9445         point)
9446     (gnus-save-hidden-threads
9447       (gnus-summary-select-article)
9448       (set-buffer gnus-article-buffer)
9449       (goto-char (window-point (get-buffer-window (current-buffer))))
9450       (when backward
9451         (forward-line -1))
9452       (while (not found)
9453         (gnus-message 7 "Searching article: %d..." (cdr gnus-article-current))
9454         (if (if backward
9455                 (re-search-backward regexp nil t)
9456               (re-search-forward regexp nil t))
9457             ;; We found the regexp.
9458             (progn
9459               (setq found 'found)
9460               (beginning-of-line)
9461               (set-window-start
9462                (get-buffer-window (current-buffer))
9463                (point))
9464               (forward-line 1)
9465               (set-window-point
9466                (get-buffer-window (current-buffer))
9467                (point))
9468               (set-buffer sum)
9469               (setq point (point)))
9470           ;; We didn't find it, so we go to the next article.
9471           (set-buffer sum)
9472           (setq found 'not)
9473           (while (eq found 'not)
9474             (if (not (if backward (gnus-summary-find-prev)
9475                        (gnus-summary-find-next)))
9476                 ;; No more articles.
9477                 (setq found t)
9478               ;; Select the next article and adjust point.
9479               (unless (gnus-summary-article-sparse-p
9480                        (gnus-summary-article-number))
9481                 (setq found nil)
9482                 (gnus-summary-select-article)
9483                 (set-buffer gnus-article-buffer)
9484                 (widen)
9485                 (goto-char (if backward (point-max) (point-min))))))))
9486       (gnus-message 7 ""))
9487     ;; Return whether we found the regexp.
9488     (when (eq found 'found)
9489       (goto-char point)
9490       (gnus-summary-show-thread)
9491       (gnus-summary-goto-subject gnus-current-article)
9492       (gnus-summary-position-point)
9493       t)))
9494
9495 (defun gnus-find-matching-articles (header regexp)
9496   "Return a list of all articles that match REGEXP on HEADER.
9497 This search includes all articles in the current group that Gnus has
9498 fetched headers for, whether they are displayed or not."
9499   (let ((articles nil)
9500         ;; Can't eta-reduce because it's a macro.
9501         (func `(lambda (h) (,(intern (concat "mail-header-" header)) h)))
9502         (case-fold-search t))
9503     (dolist (header gnus-newsgroup-headers)
9504       (when (string-match regexp (funcall func header))
9505         (push (mail-header-number header) articles)))
9506     (nreverse articles)))
9507
9508 (defun gnus-summary-find-matching (header regexp &optional backward unread
9509                                           not-case-fold not-matching)
9510   "Return a list of all articles that match REGEXP on HEADER.
9511 The search stars on the current article and goes forwards unless
9512 BACKWARD is non-nil.  If BACKWARD is `all', do all articles.
9513 If UNREAD is non-nil, only unread articles will
9514 be taken into consideration.  If NOT-CASE-FOLD, case won't be folded
9515 in the comparisons. If NOT-MATCHING, return a list of all articles that
9516 not match REGEXP on HEADER."
9517   (let ((case-fold-search (not not-case-fold))
9518         articles d func)
9519     (if (consp header)
9520         (if (eq (car header) 'extra)
9521             (setq func
9522                   `(lambda (h)
9523                      (or (cdr (assq ',(cdr header) (mail-header-extra h)))
9524                          "")))
9525           (error "%s is an invalid header" header))
9526       (unless (fboundp (intern (concat "mail-header-" header)))
9527         (error "%s is not a valid header" header))
9528       (setq func `(lambda (h) (,(intern (concat "mail-header-" header)) h))))
9529     (dolist (d (if (eq backward 'all)
9530                    gnus-newsgroup-data
9531                  (gnus-data-find-list
9532                   (gnus-summary-article-number)
9533                   (gnus-data-list backward))))
9534       (when (and (or (not unread)       ; We want all articles...
9535                      (gnus-data-unread-p d)) ; Or just unreads.
9536                  (vectorp (gnus-data-header d)) ; It's not a pseudo.
9537                  (if not-matching
9538                      (not (string-match
9539                            regexp
9540                            (funcall func (gnus-data-header d))))
9541                    (string-match regexp
9542                                  (funcall func (gnus-data-header d)))))
9543         (push (gnus-data-number d) articles))) ; Success!
9544     (nreverse articles)))
9545
9546 (defun gnus-summary-execute-command (header regexp command &optional backward)
9547   "Search forward for an article whose HEADER matches REGEXP and execute COMMAND.
9548 If HEADER is an empty string (or nil), the match is done on the entire
9549 article.  If BACKWARD (the prefix) is non-nil, search backward instead."
9550   (interactive
9551    (list (let ((completion-ignore-case t))
9552            (gnus-completing-read
9553             "Header name"
9554             (mapcar 'symbol-name
9555                     (append
9556                      '(Number Subject From Lines Date
9557                        Message-ID Xref References Body)
9558                      gnus-extra-headers))
9559             'require-match))
9560          (read-string "Regexp: ")
9561          (read-key-sequence "Command: ")
9562          current-prefix-arg))
9563   (when (equal header "Body")
9564     (setq header ""))
9565   ;; Hidden thread subtrees must be searched as well.
9566   (gnus-summary-show-all-threads)
9567   ;; We don't want to change current point nor window configuration.
9568   (save-excursion
9569     (save-window-excursion
9570       (let (gnus-visual
9571             gnus-treat-strip-trailing-blank-lines
9572             gnus-treat-strip-leading-blank-lines
9573             gnus-treat-strip-multiple-blank-lines
9574             gnus-treat-hide-boring-headers
9575             gnus-treat-fold-newsgroups
9576             gnus-article-prepare-hook)
9577         (gnus-message 6 "Executing %s..." (key-description command))
9578         ;; We'd like to execute COMMAND interactively so as to give arguments.
9579         (gnus-execute header regexp
9580                       `(call-interactively ',(key-binding command))
9581                       backward)
9582         (gnus-message 6 "Executing %s...done" (key-description command))))))
9583
9584 (defun gnus-summary-beginning-of-article ()
9585   "Scroll the article back to the beginning."
9586   (interactive)
9587   (gnus-summary-select-article)
9588   (gnus-configure-windows 'article)
9589   (gnus-eval-in-buffer-window gnus-article-buffer
9590     (widen)
9591     (goto-char (point-min))
9592     (when gnus-break-pages
9593       (gnus-narrow-to-page))))
9594
9595 (defun gnus-summary-end-of-article ()
9596   "Scroll to the end of the article."
9597   (interactive)
9598   (gnus-summary-select-article)
9599   (gnus-configure-windows 'article)
9600   (gnus-eval-in-buffer-window gnus-article-buffer
9601     (widen)
9602     (goto-char (point-max))
9603     (recenter -3)
9604     (when gnus-break-pages
9605       (gnus-narrow-to-page))))
9606
9607 (defun gnus-summary-print-truncate-and-quote (string &optional len)
9608   "Truncate to LEN and quote all \"(\"'s in STRING."
9609   (gnus-replace-in-string (if (and len (> (length string) len))
9610                               (substring string 0 len)
9611                             string)
9612                           "[()]" "\\\\\\&"))
9613
9614 (defun gnus-summary-print-article (&optional filename n)
9615   "Generate and print a PostScript image of the process-marked (mail) articles.
9616
9617 If used interactively, print the current article if none are
9618 process-marked.  With prefix arg, prompt the user for the name of the
9619 file to save in.
9620
9621 When used from Lisp, accept two optional args FILENAME and N.  N means
9622 to print the next N articles.  If N is negative, print the N previous
9623 articles.  If N is nil and articles have been marked with the process
9624 mark, print these instead.
9625
9626 If the optional first argument FILENAME is nil, send the image to the
9627 printer.  If FILENAME is a string, save the PostScript image in a file with
9628 that name.  If FILENAME is a number, prompt the user for the name of the file
9629 to save in."
9630   (interactive (list (ps-print-preprint current-prefix-arg)))
9631   (dolist (article (gnus-summary-work-articles n))
9632     (gnus-summary-select-article nil nil 'pseudo article)
9633     (gnus-eval-in-buffer-window gnus-article-buffer
9634       (gnus-print-buffer))
9635     (gnus-summary-remove-process-mark article))
9636   (ps-despool filename))
9637
9638 (defun gnus-print-buffer ()
9639   (let ((ps-left-header
9640          (list
9641           (concat "("
9642                   (gnus-summary-print-truncate-and-quote
9643                    (mail-header-subject gnus-current-headers)
9644                    66) ")")
9645           (concat "("
9646                   (gnus-summary-print-truncate-and-quote
9647                    (mail-header-from gnus-current-headers)
9648                    45) ")")))
9649         (ps-right-header
9650          (list
9651           "/pagenumberstring load"
9652           (concat "("
9653                   (mail-header-date gnus-current-headers) ")"))))
9654     (gnus-run-hooks 'gnus-ps-print-hook)
9655     (save-excursion
9656       (if ps-print-color-p
9657           (ps-spool-buffer-with-faces)
9658         (ps-spool-buffer)))))
9659
9660 (declare-function gnus-flush-original-article-buffer "gnus-art" ())
9661
9662 (defun gnus-summary-show-complete-article ()
9663   "Show a complete version of the current article.
9664 This is only useful if you're looking at a partial version of the
9665 article currently."
9666   (interactive)
9667   (let ((gnus-keep-backlog nil)
9668         (gnus-use-cache nil)
9669         (gnus-agent nil)
9670         (variable (intern
9671                    (format "%s-fetch-partial-articles"
9672                            (car (gnus-find-method-for-group
9673                                  gnus-newsgroup-name)))
9674                    obarray))
9675         old-val)
9676     (unwind-protect
9677         (progn
9678           (setq old-val (symbol-value variable))
9679           (set variable nil)
9680           (gnus-flush-original-article-buffer)
9681           (gnus-summary-show-article))
9682       (set variable old-val))))
9683
9684 (defun gnus-summary-show-article (&optional arg)
9685   "Force redisplaying of the current article.
9686 If ARG (the prefix) is a number, show the article with the charset
9687 defined in `gnus-summary-show-article-charset-alist', or the charset
9688 input.
9689 If ARG (the prefix) is non-nil and not a number, show the article,
9690 but without running any of the article treatment functions
9691 article.  Normally, the keystroke is `C-u g'.  When using `C-u
9692 C-u g', show the raw article."
9693   (interactive "P")
9694   (cond
9695    ((numberp arg)
9696     (gnus-summary-show-article t)
9697     (let ((gnus-newsgroup-charset
9698            (or (cdr (assq arg gnus-summary-show-article-charset-alist))
9699                (mm-read-coding-system
9700                 "View as charset: " ;; actually it is coding system.
9701                 (with-current-buffer gnus-article-buffer
9702                   (mm-detect-coding-region (point) (point-max))))))
9703           (gnus-newsgroup-ignored-charsets 'gnus-all))
9704       (gnus-summary-select-article nil 'force)
9705       (let ((deps gnus-newsgroup-dependencies)
9706             head header lines)
9707         (with-current-buffer gnus-original-article-buffer
9708           (save-restriction
9709             (message-narrow-to-head)
9710             (setq head (buffer-string))
9711             (goto-char (point-min))
9712             (unless (re-search-forward "^lines:[ \t]\\([0-9]+\\)" nil t)
9713               (goto-char (point-max))
9714               (widen)
9715               (setq lines (1- (count-lines (point) (point-max))))))
9716           (with-temp-buffer
9717             (insert (format "211 %d Article retrieved.\n"
9718                             (cdr gnus-article-current)))
9719             (insert head)
9720             (if lines (insert (format "Lines: %d\n" lines)))
9721             (insert ".\n")
9722             (let ((nntp-server-buffer (current-buffer)))
9723               (setq header (car (gnus-get-newsgroup-headers deps t))))))
9724         (gnus-data-set-header
9725          (gnus-data-find (cdr gnus-article-current))
9726          header)
9727         (gnus-summary-update-article-line
9728          (cdr gnus-article-current) header)
9729         (when (gnus-summary-goto-subject (cdr gnus-article-current) nil t)
9730           (gnus-summary-update-secondary-mark (cdr gnus-article-current))))))
9731    ((not arg)
9732     ;; Select the article the normal way.
9733     (if (eq mm-text-html-renderer 'shr)
9734         (progn
9735           (require 'shr)
9736           (let ((shr-ignore-cache t))
9737             (gnus-summary-select-article nil 'force)))
9738       (gnus-summary-select-article nil 'force)))
9739    ((equal arg '(16))
9740     ;; C-u C-u g
9741     (let ((gnus-inhibit-article-treatments t))
9742       (gnus-summary-select-article nil 'force)))
9743    (t
9744     ;; We have to require this here to make sure that the following
9745     ;; dynamic binding isn't shadowed by autoloading.
9746     (require 'gnus-async)
9747     (require 'gnus-art)
9748     ;; Bind the article treatment functions to nil.
9749     (let ((gnus-have-all-headers t)
9750           gnus-article-prepare-hook
9751           gnus-article-decode-hook
9752           gnus-display-mime-function
9753           gnus-break-pages)
9754       ;; Destroy any MIME parts.
9755       (when (gnus-buffer-live-p gnus-article-buffer)
9756         (with-current-buffer gnus-article-buffer
9757           (gnus-article-stop-animations)
9758           (gnus-stop-downloads)
9759           (mm-destroy-parts gnus-article-mime-handles)
9760           ;; Set it to nil for safety reason.
9761           (setq gnus-article-mime-handle-alist nil)
9762           (setq gnus-article-mime-handles nil)))
9763       (gnus-summary-select-article nil 'force))))
9764   (gnus-summary-goto-subject gnus-current-article)
9765   (gnus-summary-position-point))
9766
9767 (defun gnus-summary-show-raw-article ()
9768   "Show the raw article without any article massaging functions being run."
9769   (interactive)
9770   (gnus-summary-show-article t))
9771
9772 (defun gnus-summary-verbose-headers (&optional arg)
9773   "Toggle permanent full header display.
9774 If ARG is a positive number, turn header display on.
9775 If ARG is a negative number, turn header display off."
9776   (interactive "P")
9777   (setq gnus-show-all-headers
9778         (cond ((or (not (numberp arg))
9779                    (zerop arg))
9780                (not gnus-show-all-headers))
9781               ((natnump arg)
9782                t)))
9783   (gnus-summary-show-article))
9784
9785 (declare-function article-narrow-to-head "gnus-art" ())
9786 (declare-function gnus-article-hidden-text-p "gnus-art" (type))
9787 (declare-function gnus-delete-wash-type "gnus-art" (type))
9788 (declare-function gnus-mime-buttonize-attachments-in-header
9789                   "gnus-art" (&optional interactive))
9790
9791 (defun gnus-summary-toggle-header (&optional arg)
9792   "Show the headers if they are hidden, or hide them if they are shown.
9793 If ARG is a positive number, show the entire header.
9794 If ARG is a negative number, hide the unwanted header lines."
9795   (interactive "P")
9796   (let ((window (and (gnus-buffer-live-p gnus-article-buffer)
9797                      (get-buffer-window gnus-article-buffer t))))
9798     (with-current-buffer gnus-article-buffer
9799       (widen)
9800       (article-narrow-to-head)
9801       (let* ((inhibit-read-only t)
9802              (inhibit-point-motion-hooks t)
9803              (hidden (if (numberp arg)
9804                          (>= arg 0)
9805                        (or (not (looking-at "[^ \t\n]+:"))
9806                            (gnus-article-hidden-text-p 'headers))))
9807              s e)
9808         (delete-region (point-min) (point-max))
9809         (with-current-buffer gnus-original-article-buffer
9810           (goto-char (setq s (point-min)))
9811           (setq e (if (search-forward "\n\n" nil t)
9812                       (1- (point))
9813                     (point-max))))
9814         (insert-buffer-substring gnus-original-article-buffer s e)
9815         (run-hooks 'gnus-article-decode-hook)
9816         (if hidden
9817             (let ((gnus-treat-hide-headers nil)
9818                   (gnus-treat-hide-boring-headers nil))
9819               (gnus-delete-wash-type 'headers)
9820               (gnus-treat-article 'head))
9821           (gnus-treat-article 'head)
9822           ;; Add attachment buttons to the header.
9823           (when gnus-mime-display-attachment-buttons-in-header
9824             (gnus-mime-buttonize-attachments-in-header)))
9825         (widen)
9826         (if window
9827             (set-window-start window (goto-char (point-min))))
9828         (if gnus-break-pages
9829             (gnus-narrow-to-page)
9830           (when (gnus-visual-p 'page-marker)
9831             (let ((inhibit-read-only t))
9832               (gnus-remove-text-with-property 'gnus-prev)
9833               (gnus-remove-text-with-property 'gnus-next))))
9834         (gnus-set-mode-line 'article)))))
9835
9836 (defun gnus-summary-show-all-headers ()
9837   "Make all header lines visible."
9838   (interactive)
9839   (gnus-summary-toggle-header 1))
9840
9841 (defun gnus-summary-caesar-message (&optional arg)
9842   "Caesar rotate the current article by 13.
9843 With a non-numerical prefix, also rotate headers.  A numerical
9844 prefix specifies how many places to rotate each letter forward."
9845   (interactive "P")
9846   (gnus-summary-select-article)
9847   (let ((mail-header-separator ""))
9848     (gnus-eval-in-buffer-window gnus-article-buffer
9849       (save-restriction
9850         (widen)
9851         (let ((start (window-start))
9852               (inhibit-read-only t))
9853           (if (equal arg '(4))
9854               (message-caesar-buffer-body nil t)
9855             (message-caesar-buffer-body arg))
9856           (set-window-start (get-buffer-window (current-buffer)) start)))))
9857   ;; Create buttons and stuff...
9858   (gnus-treat-article nil))
9859
9860 (declare-function idna-to-unicode "ext:idna" (str))
9861
9862 (defun gnus-summary-idna-message (&optional arg)
9863   "Decode IDNA encoded domain names in the current articles.
9864 IDNA encoded domain names looks like `xn--bar'.  If a string
9865 remain unencoded after running this function, it is likely an
9866 invalid IDNA string (`xn--bar' is invalid).
9867
9868 You must have GNU Libidn (URL `http://www.gnu.org/software/libidn/')
9869 installed for this command to work."
9870   (interactive "P")
9871   (if (not (and (condition-case nil (require 'idna)
9872                   (file-error))
9873                 (mm-coding-system-p 'utf-8)
9874                 (symbol-value 'idna-program)
9875                 (executable-find (symbol-value 'idna-program))))
9876       (gnus-message
9877        5 "GNU Libidn not installed properly (`idn' or `idna.el' missing)")
9878     (gnus-summary-select-article)
9879     (let ((mail-header-separator ""))
9880       (gnus-eval-in-buffer-window gnus-article-buffer
9881         (save-restriction
9882           (widen)
9883           (let ((start (window-start))
9884                 buffer-read-only)
9885             (while (re-search-forward "\\(xn--[-0-9a-z]+\\)" nil t)
9886               (replace-match (idna-to-unicode (match-string 1))))
9887             (set-window-start (get-buffer-window (current-buffer)) start)))))))
9888
9889 (defun gnus-summary-morse-message (&optional arg)
9890   "Morse decode the current article."
9891   (interactive "P")
9892   (gnus-summary-select-article)
9893   (let ((mail-header-separator ""))
9894     (gnus-eval-in-buffer-window gnus-article-buffer
9895       (save-excursion
9896         (save-restriction
9897           (widen)
9898           (let ((pos (window-start))
9899                 (inhibit-read-only t))
9900             (goto-char (point-min))
9901             (when (message-goto-body)
9902               (gnus-narrow-to-body))
9903             (goto-char (point-min))
9904             (while (search-forward "·" (point-max) t)
9905               (replace-match "."))
9906             (unmorse-region (point-min) (point-max))
9907             (widen)
9908             (set-window-start (get-buffer-window (current-buffer)) pos)))))))
9909
9910 (defun gnus-summary-stop-page-breaking ()
9911   "Stop page breaking in the current article."
9912   (interactive)
9913   (gnus-summary-select-article)
9914   (gnus-eval-in-buffer-window gnus-article-buffer
9915     (widen)
9916     (when (gnus-visual-p 'page-marker)
9917       (let ((inhibit-read-only t))
9918         (gnus-remove-text-with-property 'gnus-prev)
9919         (gnus-remove-text-with-property 'gnus-next))
9920       (setq gnus-page-broken nil))))
9921
9922 (defun gnus-summary-move-article (&optional n to-newsgroup
9923                                             select-method action)
9924   "Move the current article to a different newsgroup.
9925 If N is a positive number, move the N next articles.
9926 If N is a negative number, move the N previous articles.
9927 If N is nil and any articles have been marked with the process mark,
9928 move those articles instead.
9929 If TO-NEWSGROUP is string, do not prompt for a newsgroup to move to.
9930 If SELECT-METHOD is non-nil, do not move to a specific newsgroup, but
9931 re-spool using this method.
9932
9933 When called interactively with TO-NEWSGROUP being nil, the value of
9934 the variable `gnus-move-split-methods' is used for finding a default
9935 for the target newsgroup.
9936
9937 For this function to work, both the current newsgroup and the
9938 newsgroup that you want to move to have to support the `request-move'
9939 and `request-accept' functions.
9940
9941 ACTION can be either `move' (the default), `crosspost' or `copy'."
9942   (interactive "P")
9943   (unless action
9944     (setq action 'move))
9945   ;; Check whether the source group supports the required functions.
9946   (cond ((and (eq action 'move)
9947               (not (gnus-check-backend-function
9948                     'request-move-article gnus-newsgroup-name)))
9949          (error "The current group does not support article moving"))
9950         ((and (eq action 'crosspost)
9951               (not (gnus-check-backend-function
9952                     'request-replace-article gnus-newsgroup-name)))
9953          (error "The current group does not support article editing")))
9954   (let ((articles (gnus-summary-work-articles n))
9955         (prefix (if (gnus-check-backend-function
9956                      'request-move-article gnus-newsgroup-name)
9957                     (funcall gnus-move-group-prefix-function
9958                              gnus-newsgroup-name)
9959                   ""))
9960         (names '((move "Move" "Moving")
9961                  (copy "Copy" "Copying")
9962                  (crosspost "Crosspost" "Crossposting")))
9963         (copy-buf (save-excursion
9964                     (nnheader-set-temp-buffer " *copy article*")))
9965         art-group to-method new-xref article to-groups
9966         articles-to-update-marks encoded)
9967     (unless (assq action names)
9968       (error "Unknown action %s" action))
9969     ;; Read the newsgroup name.
9970     (when (and (not to-newsgroup)
9971                (not select-method))
9972       (if (and gnus-move-split-methods
9973                (not
9974                 (and (memq gnus-current-article articles)
9975                      (gnus-buffer-live-p gnus-original-article-buffer))))
9976           ;; When `gnus-move-split-methods' is non-nil, we have to
9977           ;; select an article to give `gnus-read-move-group-name' an
9978           ;; opportunity to suggest an appropriate default.  However,
9979           ;; we needn't render or mark the article.
9980           (let ((gnus-display-mime-function nil)
9981                 (gnus-article-prepare-hook nil)
9982                 (gnus-mark-article-hook nil))
9983             (gnus-summary-select-article nil nil nil (car articles))))
9984       (setq to-newsgroup (gnus-read-move-group-name
9985                           (cadr (assq action names))
9986                           (symbol-value
9987                            (intern (format "gnus-current-%s-group" action)))
9988                           articles prefix)
9989             encoded to-newsgroup
9990             to-method (gnus-server-to-method (gnus-group-method to-newsgroup)))
9991       (set (intern (format "gnus-current-%s-group" action))
9992            (mm-decode-coding-string
9993             to-newsgroup
9994             (gnus-group-name-charset to-method to-newsgroup))))
9995     (unless to-method
9996       (setq to-method (or select-method
9997                           (gnus-server-to-method
9998                            (gnus-group-method to-newsgroup)))))
9999     (setq to-newsgroup
10000           (or encoded
10001               (and to-newsgroup
10002                    (mm-encode-coding-string
10003                     to-newsgroup
10004                     (gnus-group-name-charset to-method to-newsgroup)))))
10005     ;; Check the method we are to move this article to...
10006     (unless (gnus-check-backend-function
10007              'request-accept-article (car to-method))
10008       (error "%s does not support article copying" (car to-method)))
10009     (unless (gnus-check-server to-method)
10010       (error "Can't open server %s" (car to-method)))
10011     (gnus-message 6 "%s to %s: %s..."
10012                   (caddr (assq action names))
10013                   (or (car select-method)
10014                       (gnus-group-decoded-name to-newsgroup))
10015                   articles)
10016     (while articles
10017       (setq article (pop articles))
10018       ;; Set any marks that may have changed in the summary buffer.
10019       (when gnus-preserve-marks
10020         (gnus-summary-push-marks-to-backend article))
10021       (setq
10022        art-group
10023        (cond
10024         ;; Move the article.
10025         ((eq action 'move)
10026          ;; Remove this article from future suppression.
10027          (gnus-dup-unsuppress-article article)
10028          (let* ((from-method (gnus-find-method-for-group
10029                               gnus-newsgroup-name))
10030                 (to-method (or select-method
10031                                (gnus-find-method-for-group to-newsgroup)))
10032                 (move-is-internal (gnus-server-equal from-method to-method)))
10033            (gnus-request-move-article
10034             article                     ; Article to move
10035             gnus-newsgroup-name         ; From newsgroup
10036             (nth 1 (gnus-find-method-for-group
10037                     gnus-newsgroup-name)) ; Server
10038             (list 'gnus-request-accept-article
10039                   to-newsgroup (list 'quote select-method)
10040                   (not articles) t)     ; Accept form
10041             (not articles)              ; Only save nov last time
10042             (and move-is-internal
10043                  to-newsgroup           ; Not respooling
10044                                         ; Is this move internal?
10045                  (gnus-group-real-name to-newsgroup)))))
10046         ;; Copy the article.
10047         ((eq action 'copy)
10048          (with-current-buffer copy-buf
10049            (when (gnus-request-article-this-buffer article
10050                                                    gnus-newsgroup-name)
10051              (save-restriction
10052                (nnheader-narrow-to-headers)
10053                (dolist (hdr gnus-copy-article-ignored-headers)
10054                  (message-remove-header hdr t)))
10055              (gnus-request-accept-article
10056               to-newsgroup select-method (not articles) t))))
10057         ;; Crosspost the article.
10058         ((eq action 'crosspost)
10059          (let ((xref (message-tokenize-header
10060                       (mail-header-xref (gnus-summary-article-header
10061                                          article))
10062                       " ")))
10063            (setq new-xref (concat (gnus-group-real-name gnus-newsgroup-name)
10064                                   ":" (number-to-string article)))
10065            (unless xref
10066              (setq xref (list (system-name))))
10067            (setq new-xref
10068                  (concat
10069                   (mapconcat 'identity
10070                              (delete "Xref:" (delete new-xref xref))
10071                              " ")
10072                   " " new-xref))
10073            (with-current-buffer copy-buf
10074              ;; First put the article in the destination group.
10075              (gnus-request-article-this-buffer article gnus-newsgroup-name)
10076              (when (consp (setq art-group
10077                                 (gnus-request-accept-article
10078                                  to-newsgroup select-method (not articles)
10079                                  t)))
10080                (setq new-xref (concat new-xref " " (car art-group)
10081                                       ":"
10082                                       (number-to-string (cdr art-group))))
10083                ;; Now we have the new Xrefs header, so we insert
10084                ;; it and replace the new article.
10085                (nnheader-replace-header "Xref" new-xref)
10086                (gnus-request-replace-article
10087                 (cdr art-group) to-newsgroup (current-buffer) t)
10088                art-group))))))
10089       (cond
10090        ((not art-group)
10091         (gnus-message 1 "Couldn't %s article %s: %s"
10092                       (cadr (assq action names)) article
10093                       (nnheader-get-report (car to-method))))
10094        ((eq art-group 'junk)
10095         (when (eq action 'move)
10096           (gnus-summary-mark-article article gnus-canceled-mark)
10097           (gnus-message 4 "Deleted article %s" article)
10098           ;; run the delete hook
10099           (run-hook-with-args 'gnus-summary-article-delete-hook
10100                               action
10101                               (gnus-data-header
10102                                (assoc article (gnus-data-list nil)))
10103                               gnus-newsgroup-name nil
10104                               select-method)))
10105        (t
10106         (let* ((pto-group (gnus-group-prefixed-name
10107                            (car art-group) to-method))
10108                (info (gnus-get-info pto-group))
10109                (to-group (gnus-info-group info))
10110                to-marks)
10111           ;; Update the group that has been moved to.
10112           (when (and info
10113                      (memq action '(move copy)))
10114             (unless (member to-group to-groups)
10115               (push to-group to-groups))
10116
10117             (when (and (not (memq article gnus-newsgroup-unreads))
10118                        (cdr art-group))
10119               (push 'read to-marks)
10120               (gnus-info-set-read
10121                info (gnus-add-to-range (gnus-info-read info)
10122                                        (list (cdr art-group)))))
10123
10124             ;; See whether the article is to be put in the cache.
10125             (let* ((expirable (gnus-group-auto-expirable-p to-group))
10126                    (marks (if expirable
10127                               gnus-article-mark-lists
10128                             (delete '(expirable . expire)
10129                                     (copy-sequence
10130                                      gnus-article-mark-lists))))
10131                    (to-article (cdr art-group)))
10132
10133               ;; Enter the article into the cache in the new group,
10134               ;; if that is required.
10135               (when (and to-article
10136                          gnus-use-cache)
10137                 (gnus-cache-possibly-enter-article
10138                  to-group to-article
10139                  (memq article gnus-newsgroup-marked)
10140                  (memq article gnus-newsgroup-dormant)
10141                  (memq article gnus-newsgroup-unreads)))
10142
10143               (when (and gnus-preserve-marks
10144                          to-article)
10145                 ;; Copy any marks over to the new group.
10146                 (when (and (equal to-group gnus-newsgroup-name)
10147                            (not (memq article gnus-newsgroup-unreads)))
10148                   ;; Mark this article as read in this group.
10149                   (push (cons to-article gnus-read-mark)
10150                         gnus-newsgroup-reads)
10151                   ;; Increase the active status of this group.
10152                   (setcdr (gnus-active to-group) to-article)
10153                   (setcdr gnus-newsgroup-active to-article))
10154
10155                 (while marks
10156                   (when (eq (gnus-article-mark-to-type (cdar marks)) 'list)
10157                     (when (memq article (symbol-value
10158                                          (intern (format "gnus-newsgroup-%s"
10159                                                          (caar marks)))))
10160                       (push (cdar marks) to-marks)
10161                       ;; If the other group is the same as this group,
10162                       ;; then we have to add the mark to the list.
10163                       (when (equal to-group gnus-newsgroup-name)
10164                         (set (intern (format "gnus-newsgroup-%s"
10165                                              (caar marks)))
10166                              (cons to-article
10167                                    (symbol-value
10168                                     (intern (format "gnus-newsgroup-%s"
10169                                                     (caar marks)))))))
10170                       ;; Copy the marks to other group.
10171                       (gnus-add-marked-articles
10172                        to-group (cdar marks) (list to-article) info)))
10173                   (setq marks (cdr marks)))
10174
10175                 (when (and expirable
10176                            gnus-mark-copied-or-moved-articles-as-expirable
10177                            (not (memq 'expire to-marks)))
10178                   ;; Mark this article as expirable.
10179                   (push 'expire to-marks)
10180                   (when (equal to-group gnus-newsgroup-name)
10181                     (push to-article gnus-newsgroup-expirable))
10182                   ;; Copy the expirable mark to other group.
10183                   (gnus-add-marked-articles
10184                    to-group 'expire (list to-article) info))
10185
10186                 (when (and to-marks
10187                            (gnus-method-option-p
10188                             (gnus-find-method-for-group to-group)
10189                             'server-marks))
10190                   (gnus-request-set-mark
10191                    to-group (list (list (list to-article) 'add to-marks)))))
10192
10193               (gnus-dribble-enter
10194                (concat "(gnus-group-set-info '"
10195                        (gnus-prin1-to-string (gnus-get-info to-group))
10196                        ")")
10197                (concat "^(gnus-group-set-info '(\""
10198                        (regexp-quote to-group) "\""))))
10199
10200           ;; Update the Xref header in this article to point to
10201           ;; the new crossposted article we have just created.
10202           (when (eq action 'crosspost)
10203             (with-current-buffer copy-buf
10204               (gnus-request-article-this-buffer article gnus-newsgroup-name)
10205               (nnheader-replace-header "Xref" new-xref)
10206               (gnus-request-replace-article
10207                article gnus-newsgroup-name (current-buffer) t)))
10208
10209           ;; run the move/copy/crosspost/respool hook
10210           (run-hook-with-args 'gnus-summary-article-move-hook
10211                               action
10212                               (gnus-data-header
10213                                (assoc article (gnus-data-list nil)))
10214                               gnus-newsgroup-name
10215                               to-newsgroup
10216                               select-method))
10217
10218         ;;;!!!Why is this necessary?
10219         (set-buffer gnus-summary-buffer)
10220
10221         (when (eq action 'move)
10222           (save-excursion
10223             (gnus-summary-goto-subject article)
10224             (gnus-summary-mark-article article gnus-canceled-mark)))))
10225       (push article articles-to-update-marks))
10226
10227     (save-excursion
10228       (apply 'gnus-summary-remove-process-mark articles-to-update-marks))
10229     ;; Re-activate all groups that have been moved to.
10230     (with-current-buffer gnus-group-buffer
10231       (let ((gnus-group-marked to-groups))
10232         (gnus-group-get-new-news-this-group nil t)))
10233
10234     (gnus-kill-buffer copy-buf)
10235     (gnus-summary-position-point)
10236     (gnus-set-mode-line 'summary)))
10237
10238 (defun gnus-summary-push-marks-to-backend (article)
10239   (let ((set nil)
10240         (del nil)
10241         (marks gnus-article-mark-lists))
10242     (unless (memq article gnus-newsgroup-unreads)
10243       (push 'read set))
10244     (while marks
10245       (if (and (eq (gnus-article-mark-to-type (cdar marks)) 'list)
10246                (memq article (symbol-value
10247                               (intern (format "gnus-newsgroup-%s"
10248                                               (caar marks))))))
10249           (push (cdar marks) set)
10250         (push (cdar marks) del))
10251       (pop marks))
10252     (gnus-request-set-mark gnus-newsgroup-name `(((,article) set ,set)
10253                                                  ((,article) del ,del)))))
10254
10255 (defun gnus-summary-copy-article (&optional n to-newsgroup select-method)
10256   "Copy the current article to some other group.
10257 If TO-NEWSGROUP is string, do not prompt for a newsgroup to copy to.
10258 When called interactively, if TO-NEWSGROUP is nil, use the value of
10259 the variable `gnus-move-split-methods' for finding a default target
10260 newsgroup.
10261 If SELECT-METHOD is non-nil, do not move to a specific newsgroup, but
10262 re-spool using this method."
10263   (interactive "P")
10264   (gnus-summary-move-article n to-newsgroup select-method 'copy))
10265
10266 (defun gnus-summary-crosspost-article (&optional n)
10267   "Crosspost the current article to some other group."
10268   (interactive "P")
10269   (gnus-summary-move-article n nil nil 'crosspost))
10270
10271 (defcustom gnus-summary-respool-default-method nil
10272   "Default method type for respooling an article.
10273 If nil, use to the current newsgroup method."
10274   :type 'symbol
10275   :group 'gnus-summary-mail)
10276
10277 (defun gnus-summary-respool-article (&optional n method)
10278   "Respool the current article.
10279 The article will be squeezed through the mail spooling process again,
10280 which means that it will be put in some mail newsgroup or other
10281 depending on `nnmail-split-methods'.
10282 If N is a positive number, respool the N next articles.
10283 If N is a negative number, respool the N previous articles.
10284 If N is nil and any articles have been marked with the process mark,
10285 respool those articles instead.
10286
10287 Respooling can be done both from mail groups and \"real\" newsgroups.
10288 In the former case, the articles in question will be moved from the
10289 current group into whatever groups they are destined to.  In the
10290 latter case, they will be copied into the relevant groups."
10291   (interactive
10292    (list current-prefix-arg
10293          (let* ((methods (mapcar #'car (gnus-methods-using 'respool)))
10294                 (methname
10295                  (symbol-name (or gnus-summary-respool-default-method
10296                                   (car (gnus-find-method-for-group
10297                                         gnus-newsgroup-name)))))
10298                 (method
10299                  (gnus-completing-read
10300                   "Backend to use when respooling"
10301                   methods t nil 'gnus-mail-method-history methname))
10302                 ms)
10303            (cond
10304             ((zerop (length (setq ms (gnus-servers-using-backend
10305                                       (intern method)))))
10306              (list (intern method) ""))
10307             ((= 1 (length ms))
10308              (car ms))
10309             (t
10310              (let ((ms-alist (mapcar (lambda (m) (cons (cadr m) m)) ms)))
10311                (cdr (assoc (gnus-completing-read "Server name" ms-alist t)
10312                            ms-alist))))))))
10313   (unless method
10314     (error "No method given for respooling"))
10315   (if (assoc (symbol-name
10316               (car (gnus-find-method-for-group gnus-newsgroup-name)))
10317              (gnus-methods-using 'respool))
10318       (gnus-summary-move-article n nil method)
10319     (gnus-summary-copy-article n nil method)))
10320
10321 (defun gnus-summary-import-article (file &optional edit)
10322   "Import an arbitrary file into a mail newsgroup."
10323   (interactive "fImport file: \nP")
10324   (let ((group gnus-newsgroup-name)
10325         (now (current-time))
10326         atts lines group-art)
10327     (unless (gnus-check-backend-function 'request-accept-article group)
10328       (error "%s does not support article importing" group))
10329     (or (file-readable-p file)
10330         (not (file-regular-p file))
10331         (error "Can't read %s" file))
10332     (with-current-buffer (gnus-get-buffer-create " *import file*")
10333       (erase-buffer)
10334       (nnheader-insert-file-contents file)
10335       (goto-char (point-min))
10336       (if (nnheader-article-p)
10337           (save-restriction
10338             (goto-char (point-min))
10339             (search-forward "\n\n" nil t)
10340             (narrow-to-region (point-min) (1- (point)))
10341             (goto-char (point-min))
10342             (unless (re-search-forward "^date:" nil t)
10343               (goto-char (point-max))
10344               (insert "Date: " (message-make-date (nth 5 atts)) "\n")))
10345        ;; This doesn't look like an article, so we fudge some headers.
10346         (setq atts (file-attributes file)
10347               lines (count-lines (point-min) (point-max)))
10348         (insert "From: " (read-string "From: ") "\n"
10349                 "Subject: " (read-string "Subject: ") "\n"
10350                 "Date: " (message-make-date (nth 5 atts)) "\n"
10351                 "Message-ID: " (message-make-message-id) "\n"
10352                 "Lines: " (int-to-string lines) "\n"
10353                 "Chars: " (int-to-string (nth 7 atts)) "\n\n"))
10354       (setq group-art (gnus-request-accept-article group nil t))
10355       (kill-buffer (current-buffer)))
10356     (setq gnus-newsgroup-active (gnus-activate-group group))
10357     (forward-line 1)
10358     (gnus-summary-goto-article (cdr group-art) nil t)
10359     (when edit
10360       (gnus-summary-edit-article))))
10361
10362 (defun gnus-summary-create-article ()
10363   "Create an article in a mail newsgroup."
10364   (interactive)
10365   (let ((group gnus-newsgroup-name)
10366         (now (current-time))
10367         group-art)
10368     (unless (gnus-check-backend-function 'request-accept-article group)
10369       (error "%s does not support article importing" group))
10370     (with-current-buffer (gnus-get-buffer-create " *import file*")
10371       (erase-buffer)
10372       (goto-char (point-min))
10373       ;; This doesn't look like an article, so we fudge some headers.
10374       (insert "From: " (read-string "From: ") "\n"
10375               "Subject: " (read-string "Subject: ") "\n"
10376               "Date: " (message-make-date now) "\n"
10377               "Message-ID: " (message-make-message-id) "\n")
10378       (setq group-art (gnus-request-accept-article group nil t))
10379       (kill-buffer (current-buffer)))
10380     (setq gnus-newsgroup-active (gnus-activate-group group))
10381     (forward-line 1)
10382     (gnus-summary-goto-article (cdr group-art) nil t)
10383     (gnus-summary-edit-article)))
10384
10385 (defun gnus-summary-article-posted-p ()
10386   "Say whether the current (mail) article is available from news as well.
10387 This will be the case if the article has both been mailed and posted."
10388   (interactive)
10389   (let ((id (mail-header-references (gnus-summary-article-header)))
10390         (gnus-override-method (car (gnus-refer-article-methods))))
10391     (if (gnus-request-head id "")
10392         (gnus-message 2 "The current message was found on %s"
10393                       gnus-override-method)
10394       (gnus-message 2 "The current message couldn't be found on %s"
10395                     gnus-override-method)
10396       nil)))
10397
10398 (defun gnus-summary-expire-articles (&optional now)
10399   "Expire all articles that are marked as expirable in the current group."
10400   (interactive)
10401   (when (and (not gnus-group-is-exiting-without-update-p)
10402              (gnus-check-backend-function
10403               'request-expire-articles gnus-newsgroup-name))
10404     ;; This backend supports expiry.
10405     (let* ((total (gnus-group-total-expirable-p gnus-newsgroup-name))
10406            (expirable
10407             (gnus-list-range-difference
10408              (if total
10409                  (progn
10410                    ;; We need to update the info for
10411                    ;; this group for `gnus-list-of-read-articles'
10412                    ;; to give us the right answer.
10413                    (gnus-run-hooks 'gnus-exit-group-hook)
10414                    (gnus-summary-update-info)
10415                    (gnus-list-of-read-articles gnus-newsgroup-name))
10416                (setq gnus-newsgroup-expirable
10417                      (sort gnus-newsgroup-expirable '<)))
10418              gnus-newsgroup-unexist))
10419            (expiry-wait (if now 'immediate
10420                           (gnus-group-find-parameter
10421                            gnus-newsgroup-name 'expiry-wait)))
10422            (nnmail-expiry-target
10423             (or (gnus-group-find-parameter gnus-newsgroup-name 'expiry-target)
10424                 nnmail-expiry-target))
10425            es)
10426       (when expirable
10427         ;; There are expirable articles in this group, so we run them
10428         ;; through the expiry process.
10429         (gnus-message 6 "Expiring articles...")
10430         (when (gnus-check-group gnus-newsgroup-name)
10431           ;; The list of articles that weren't expired is returned.
10432           (save-excursion
10433             (if expiry-wait
10434                 (let ((nnmail-expiry-wait-function nil)
10435                       (nnmail-expiry-wait expiry-wait))
10436                   (setq es (gnus-request-expire-articles
10437                             expirable gnus-newsgroup-name)))
10438               (setq es (gnus-request-expire-articles
10439                         expirable gnus-newsgroup-name)))
10440             (unless total
10441               (setq gnus-newsgroup-expirable es))
10442             ;; We go through the old list of expirable, and mark all
10443             ;; really expired articles as nonexistent.
10444             (unless (eq es expirable) ;If nothing was expired, we don't mark.
10445               (let ((gnus-use-cache nil))
10446                 (dolist (article expirable)
10447                   (when (and (not (memq article es))
10448                              (gnus-data-find article))
10449                     (gnus-summary-mark-article article gnus-canceled-mark)
10450                     (run-hook-with-args
10451                      'gnus-summary-article-expire-hook
10452                      'delete
10453                      (gnus-data-header (assoc article (gnus-data-list nil)))
10454                      gnus-newsgroup-name
10455                      (cond
10456                       ((stringp nnmail-expiry-target) nnmail-expiry-target)
10457                       ((eq nnmail-expiry-target 'delete) nil)
10458                       (t
10459                        (let ((rescall (funcall nnmail-expiry-target
10460                                                gnus-newsgroup-name)))
10461                          (if (stringp rescall) rescall nil))))
10462                      nil)))))))
10463         (gnus-message 6 "Expiring articles...done")))))
10464
10465 (defun gnus-summary-expire-articles-now ()
10466   "Expunge all expirable articles in the current group.
10467 This means that *all* articles that are marked as expirable will be
10468 deleted forever, right now."
10469   (interactive)
10470   (or gnus-expert-user
10471       (gnus-yes-or-no-p
10472        "Are you really, really sure you want to delete all expirable messages? ")
10473       (error "Phew!"))
10474   (gnus-summary-expire-articles t))
10475
10476 ;; Suggested by Jack Vinson <vinson@unagi.cis.upenn.edu>.
10477 (defun gnus-summary-delete-article (&optional n)
10478   "Delete the N next (mail) articles.
10479 This command actually deletes articles.  This is not a marking
10480 command.  The article will disappear forever from your life, never to
10481 return.
10482
10483 If N is negative, delete backwards.
10484 If N is nil and articles have been marked with the process mark,
10485 delete these instead.
10486
10487 If `gnus-novice-user' is non-nil you will be asked for
10488 confirmation before the articles are deleted."
10489   (interactive "P")
10490   (unless (gnus-check-backend-function 'request-expire-articles
10491                                        gnus-newsgroup-name)
10492     (error "The current newsgroup does not support article deletion"))
10493   (unless (gnus-check-server (gnus-find-method-for-group gnus-newsgroup-name))
10494     (error "Couldn't open server"))
10495   ;; Compute the list of articles to delete.
10496   (let ((articles (sort (copy-sequence (gnus-summary-work-articles n)) '<))
10497         (nnmail-expiry-target 'delete)
10498         not-deleted)
10499     (if (and gnus-novice-user
10500              (not (gnus-yes-or-no-p
10501                    (format "Do you really want to delete %s forever? "
10502                            (if (> (length articles) 1)
10503                                (format "these %s articles" (length articles))
10504                              "this article")))))
10505         ()
10506       ;; Delete the articles.
10507       (setq not-deleted (gnus-request-expire-articles
10508                          articles gnus-newsgroup-name 'force))
10509       (save-excursion
10510         (while articles
10511           (gnus-summary-remove-process-mark (car articles))
10512           ;; The backend might not have been able to delete the article
10513           ;; after all.
10514           (unless (memq (car articles) not-deleted)
10515             (gnus-summary-mark-article (car articles) gnus-canceled-mark)
10516             (let* ((article (car articles))
10517                    (ghead  (gnus-data-header
10518                             (assoc article (gnus-data-list nil)))))
10519               (run-hook-with-args 'gnus-summary-article-delete-hook
10520                                   'delete ghead gnus-newsgroup-name nil
10521                                   nil)))
10522           (setq articles (cdr articles))))
10523       (when not-deleted
10524         (gnus-message 4 "Couldn't delete articles %s" not-deleted)))
10525     (gnus-summary-position-point)
10526     (gnus-set-mode-line 'summary)
10527     not-deleted))
10528
10529 (defun gnus-summary-edit-article (&optional arg)
10530   "Edit the current article.
10531 This will have permanent effect only in mail groups.
10532 If ARG is nil, edit the decoded articles.
10533 If ARG is 1, edit the raw articles.
10534 If ARG is 2, edit the raw articles even in read-only groups.
10535 If ARG is 3, edit the articles with the current handles.
10536 Otherwise, allow editing of articles even in read-only
10537 groups."
10538   (interactive "P")
10539   (let (force raw current-handles)
10540     (cond
10541      ((null arg))
10542      ((eq arg 1)
10543       (setq raw t))
10544      ((eq arg 2)
10545       (setq raw t
10546             force t))
10547      ((eq arg 3)
10548       (setq current-handles
10549             (and (gnus-buffer-live-p gnus-article-buffer)
10550                  (with-current-buffer gnus-article-buffer
10551                    (prog1
10552                        gnus-article-mime-handles
10553                      (setq gnus-article-mime-handles nil))))))
10554      (t
10555       (setq force t)))
10556     (when (and raw (not force)
10557                (member gnus-newsgroup-name '("nndraft:delayed"
10558                                              "nndraft:drafts"
10559                                              "nndraft:queue")))
10560       (error "Can't edit the raw article in group %s"
10561              gnus-newsgroup-name))
10562     (with-current-buffer gnus-summary-buffer
10563       (let ((mail-parse-charset gnus-newsgroup-charset)
10564             (mail-parse-ignored-charsets gnus-newsgroup-ignored-charsets))
10565         (gnus-set-global-variables)
10566         (when (and (not force)
10567                    (gnus-group-read-only-p))
10568           (error "The current newsgroup does not support article editing"))
10569         (gnus-summary-show-article t)
10570         (when (and (not raw) (gnus-buffer-live-p gnus-article-buffer))
10571           (with-current-buffer gnus-article-buffer
10572             (mm-enable-multibyte)))
10573         (if (member gnus-newsgroup-name '("nndraft:delayed" "nndraft:drafts"))
10574             (setq raw t))
10575         (gnus-article-edit-article
10576          (if raw 'ignore
10577            `(lambda ()
10578               (let ((mbl mml-buffer-list))
10579                 (setq mml-buffer-list nil)
10580                 (let ((rfc2047-quote-decoded-words-containing-tspecials t))
10581                   (mime-to-mml ,'current-handles))
10582                 (let ((mbl1 mml-buffer-list))
10583                   (setq mml-buffer-list mbl)
10584                   (set (make-local-variable 'mml-buffer-list) mbl1))
10585                 (gnus-make-local-hook 'kill-buffer-hook)
10586                 (add-hook 'kill-buffer-hook 'mml-destroy-buffers t t))))
10587          `(lambda (no-highlight)
10588             (let ((mail-parse-charset ',gnus-newsgroup-charset)
10589                   (message-options message-options)
10590                   (message-options-set-recipient)
10591                   (mail-parse-ignored-charsets
10592                    ',gnus-newsgroup-ignored-charsets)
10593                   (rfc2047-header-encoding-alist
10594                    ',(let ((charset (gnus-group-name-charset
10595                                      (gnus-find-method-for-group
10596                                       gnus-newsgroup-name)
10597                                      gnus-newsgroup-name)))
10598                        (append (list (cons "Newsgroups" charset)
10599                                      (cons "Followup-To" charset)
10600                                      (cons "Xref" charset))
10601                                rfc2047-header-encoding-alist))))
10602               ,(if (not raw) '(progn
10603                                 (mml-to-mime)
10604                                 (mml-destroy-buffers)
10605                                 (remove-hook 'kill-buffer-hook
10606                                              'mml-destroy-buffers t)
10607                                 (kill-local-variable 'mml-buffer-list)))
10608               (gnus-summary-edit-article-done
10609                ,(or (mail-header-references gnus-current-headers) "")
10610                ,(gnus-group-read-only-p)
10611                ,gnus-summary-buffer no-highlight))))))))
10612
10613 (defalias 'gnus-summary-edit-article-postpone 'gnus-article-edit-exit)
10614
10615 (defun gnus-summary-edit-article-done (&optional references read-only buffer
10616                                                  no-highlight)
10617   "Make edits to the current article permanent."
10618   (interactive)
10619   (save-excursion
10620     ;; The buffer restriction contains the entire article if it exists.
10621     (when (article-goto-body)
10622       (let ((lines (count-lines (point) (point-max)))
10623             (length (- (point-max) (point)))
10624             (case-fold-search t)
10625             (body (point-marker)))
10626         (goto-char (point-min))
10627         (when (re-search-forward "^content-length:[ \t]\\([0-9]+\\)" body t)
10628           (delete-region (match-beginning 1) (match-end 1))
10629           (insert (number-to-string length)))
10630         (goto-char (point-min))
10631         (when (re-search-forward
10632                "^x-content-length:[ \t]\\([0-9]+\\)" body t)
10633           (delete-region (match-beginning 1) (match-end 1))
10634           (insert (number-to-string length)))
10635         (goto-char (point-min))
10636         (when (re-search-forward "^lines:[ \t]\\([0-9]+\\)" body t)
10637           (delete-region (match-beginning 1) (match-end 1))
10638           (insert (number-to-string lines))))))
10639   ;; Replace the article.
10640   (let ((buf (current-buffer))
10641         (article (cdr gnus-article-current))
10642         replace-result)
10643     (with-temp-buffer
10644       (insert-buffer-substring buf)
10645       (if (and (not read-only)
10646                (not (setq replace-result
10647                           (gnus-request-replace-article
10648                            article (car gnus-article-current)
10649                            (current-buffer) t))))
10650           (error "Couldn't replace article")
10651         ;; If we got a number back, then that's the new article number
10652         ;; for this article.  Otherwise, the article number didn't change.
10653         (when (numberp replace-result)
10654           (with-current-buffer gnus-summary-buffer
10655             (setq gnus-newsgroup-limit (delq article gnus-newsgroup-limit))
10656             (gnus-summary-limit gnus-newsgroup-limit)
10657             (setq article replace-result)
10658             (gnus-summary-goto-subject article t)))
10659         ;; Update the summary buffer.
10660         (if (and references
10661                  (equal (message-tokenize-header references " ")
10662                         (message-tokenize-header
10663                          (or (message-fetch-field "references") "") " ")))
10664             ;; We only have to update this line.
10665             (save-excursion
10666               (save-restriction
10667                 (message-narrow-to-head)
10668                 (let ((head (buffer-substring-no-properties
10669                              (point-min) (point-max)))
10670                       header)
10671                   (with-temp-buffer
10672                     (insert (format "211 %d Article retrieved.\n" article))
10673                     (insert head)
10674                     (insert ".\n")
10675                     (let ((nntp-server-buffer (current-buffer)))
10676                       (setq header (car (gnus-get-newsgroup-headers nil t))))
10677                     (with-current-buffer gnus-summary-buffer
10678                       (gnus-data-set-header (gnus-data-find article) header)
10679                       (gnus-summary-update-article-line article header)
10680                       (if (gnus-summary-goto-subject article nil t)
10681                           (gnus-summary-update-secondary-mark article)))))))
10682           ;; Update threads.
10683           (set-buffer (or buffer gnus-summary-buffer))
10684           (gnus-summary-update-article article)
10685           (if (gnus-summary-goto-subject article nil t)
10686               (gnus-summary-update-secondary-mark article)))
10687         ;; Prettify the article buffer again.
10688         (unless no-highlight
10689           (with-current-buffer gnus-article-buffer
10690             ;;!!! Fix this -- article should be rehighlighted.
10691             ;;(gnus-run-hooks 'gnus-article-display-hook)
10692             (set-buffer gnus-original-article-buffer)
10693             (gnus-request-article
10694              article (car gnus-article-current) (current-buffer))))
10695         ;; Prettify the summary buffer line.
10696         (when (gnus-visual-p 'summary-highlight 'highlight)
10697           (gnus-run-hooks 'gnus-visual-mark-article-hook))))))
10698
10699 (defun gnus-summary-edit-wash (key)
10700   "Perform editing command KEY in the article buffer."
10701   (interactive
10702    (list
10703     (progn
10704       (message "%s" (concat (this-command-keys) "- "))
10705       (read-char))))
10706   (message "")
10707   (gnus-summary-edit-article)
10708   (execute-kbd-macro (concat (this-command-keys) key))
10709   (gnus-article-edit-done))
10710
10711 ;;; Respooling
10712
10713 (defvar nnimap-split-fancy)
10714 (defvar nnimap-split-methods)
10715
10716 (defun gnus-summary-respool-query (&optional silent trace)
10717   "Query where the respool algorithm would put this article."
10718   (interactive)
10719   (let (gnus-mark-article-hook)
10720     (gnus-summary-select-article)
10721     (with-current-buffer gnus-original-article-buffer
10722       (let ((groups
10723              (if (eq (car (gnus-find-method-for-group gnus-newsgroup-name))
10724                      'nnimap)
10725                  ;; nnimap has its own splitting variables.
10726                  (let ((nnmail-split-methods
10727                         (cond
10728                          ((eq nnimap-split-methods 'default)
10729                           nnmail-split-methods)
10730                          (nnimap-split-methods
10731                           nnimap-split-methods)
10732                          (nnimap-split-fancy
10733                           'nnmail-split-fancy)))
10734                        (nnmail-split-fancy (or nnimap-split-fancy
10735                                                nnmail-split-fancy)))
10736                    (nnmail-article-group 'identity trace))
10737                (nnmail-article-group 'identity trace))))
10738         (unless silent
10739           (if groups
10740               (message "This message would go to %s"
10741                        (mapconcat 'car groups ", "))
10742             (message "This message would go to no groups"))
10743           groups)))))
10744
10745 (defun gnus-summary-respool-trace ()
10746   "Trace where the respool algorithm would put this article.
10747 Display a buffer showing all fancy splitting patterns which matched."
10748   (interactive)
10749   (gnus-summary-respool-query nil t))
10750
10751 ;; Summary marking commands.
10752
10753 (defun gnus-summary-kill-same-subject-and-select (&optional unmark)
10754   "Mark articles which has the same subject as read, and then select the next.
10755 If UNMARK is positive, remove any kind of mark.
10756 If UNMARK is negative, tick articles."
10757   (interactive "P")
10758   (when unmark
10759     (setq unmark (prefix-numeric-value unmark)))
10760   (let ((count
10761          (gnus-summary-mark-same-subject
10762           (gnus-summary-article-subject) unmark)))
10763     ;; Select next unread article.  If auto-select-same mode, should
10764     ;; select the first unread article.
10765     (gnus-summary-next-article t (and gnus-auto-select-same
10766                                       (gnus-summary-article-subject)))
10767     (gnus-message 7 "%d article%s marked as %s"
10768                   count (if (= count 1) " is" "s are")
10769                   (if unmark "unread" "read"))))
10770
10771 (defun gnus-summary-kill-same-subject (&optional unmark)
10772   "Mark articles which has the same subject as read.
10773 If UNMARK is positive, remove any kind of mark.
10774 If UNMARK is negative, tick articles."
10775   (interactive "P")
10776   (when unmark
10777     (setq unmark (prefix-numeric-value unmark)))
10778   (let ((count
10779          (gnus-summary-mark-same-subject
10780           (gnus-summary-article-subject) unmark)))
10781     ;; If marked as read, go to next unread subject.
10782     (when (null unmark)
10783       ;; Go to next unread subject.
10784       (gnus-summary-next-subject 1 t))
10785     (gnus-message 7 "%d articles are marked as %s"
10786                   count (if unmark "unread" "read"))))
10787
10788 (defun gnus-summary-mark-same-subject (subject &optional unmark)
10789   "Mark articles with same SUBJECT as read, and return marked number.
10790 If optional argument UNMARK is positive, remove any kinds of marks.
10791 If optional argument UNMARK is negative, mark articles as unread instead."
10792   (let ((count 1))
10793     (save-excursion
10794       (cond
10795        ((null unmark)                   ; Mark as read.
10796         (while (and
10797                 (progn
10798                   (gnus-summary-mark-article-as-read gnus-killed-mark)
10799                   (gnus-summary-show-thread) t)
10800                 (gnus-summary-find-subject subject))
10801           (setq count (1+ count))))
10802        ((> unmark 0)                    ; Tick.
10803         (while (and
10804                 (progn
10805                   (gnus-summary-mark-article-as-unread gnus-ticked-mark)
10806                   (gnus-summary-show-thread) t)
10807                 (gnus-summary-find-subject subject))
10808           (setq count (1+ count))))
10809        (t                               ; Mark as unread.
10810         (while (and
10811                 (progn
10812                   (gnus-summary-mark-article-as-unread gnus-unread-mark)
10813                   (gnus-summary-show-thread) t)
10814                 (gnus-summary-find-subject subject))
10815           (setq count (1+ count)))))
10816       (gnus-set-mode-line 'summary)
10817       ;; Return the number of marked articles.
10818       count)))
10819
10820 (defun gnus-summary-mark-as-processable (n &optional unmark)
10821   "Set the process mark on the next N articles.
10822 If N is negative, mark backward instead.  If UNMARK is non-nil, remove
10823 the process mark instead.  The difference between N and the actual
10824 number of articles marked is returned."
10825   (interactive "P")
10826   (if (and (null n) (gnus-region-active-p))
10827       (gnus-uu-mark-region (region-beginning) (region-end) unmark)
10828     (setq n (prefix-numeric-value n))
10829     (let ((backward (< n 0))
10830           (n (abs n)))
10831       (while (and
10832               (> n 0)
10833               (if unmark
10834                   (gnus-summary-remove-process-mark
10835                    (gnus-summary-article-number))
10836                 (gnus-summary-set-process-mark (gnus-summary-article-number)))
10837               (zerop (gnus-summary-next-subject (if backward -1 1) nil t)))
10838         (setq n (1- n)))
10839       (when (/= 0 n)
10840         (gnus-message 7 "No more articles"))
10841       (gnus-summary-recenter)
10842       (gnus-summary-position-point)
10843       n)))
10844
10845 (defun gnus-summary-unmark-as-processable (n)
10846   "Remove the process mark from the next N articles.
10847 If N is negative, unmark backward instead.  The difference between N and
10848 the actual number of articles unmarked is returned."
10849   (interactive "P")
10850   (gnus-summary-mark-as-processable n t))
10851
10852 (defun gnus-summary-unmark-all-processable ()
10853   "Remove the process mark from all articles."
10854   (interactive)
10855   (save-excursion
10856     (while gnus-newsgroup-processable
10857       (gnus-summary-remove-process-mark (car gnus-newsgroup-processable))))
10858   (gnus-summary-position-point))
10859
10860 (defun gnus-summary-add-mark (article type)
10861   "Mark ARTICLE with a mark of TYPE."
10862   (let ((vtype (car (assq type gnus-article-mark-lists)))
10863         var)
10864     (if (not vtype)
10865         (error "No such mark type: %s" type)
10866       (setq var (intern (format "gnus-newsgroup-%s" type)))
10867       (set var (cons article (symbol-value var)))
10868       (if (memq type '(processable cached replied forwarded recent saved))
10869           (gnus-summary-update-secondary-mark article)
10870         ;;; !!! This is bogus.  We should find out what primary
10871         ;;; !!! mark we want to set.
10872         (gnus-summary-update-mark gnus-del-mark 'unread)))))
10873
10874 (defun gnus-summary-mark-as-expirable (n)
10875   "Mark N articles forward as expirable.
10876 If N is negative, mark backward instead.  The difference between N and
10877 the actual number of articles marked is returned."
10878   (interactive "p")
10879   (gnus-summary-mark-forward n gnus-expirable-mark))
10880
10881 (defun gnus-summary-mark-as-spam (n)
10882   "Mark N articles forward as spam.
10883 If N is negative, mark backward instead.  The difference between N and
10884 the actual number of articles marked is returned."
10885   (interactive "p")
10886   (gnus-summary-mark-forward n gnus-spam-mark))
10887
10888 (defun gnus-summary-mark-article-as-replied (article)
10889   "Mark ARTICLE as replied to and update the summary line.
10890 ARTICLE can also be a list of articles."
10891   (interactive (list (gnus-summary-article-number)))
10892   (let ((articles (if (listp article) article (list article))))
10893     (dolist (article articles)
10894       (unless (numberp article)
10895         (error "%s is not a number" article))
10896       (push article gnus-newsgroup-replied)
10897       (let ((inhibit-read-only t))
10898         (when (gnus-summary-goto-subject article nil t)
10899           (gnus-summary-update-secondary-mark article))))))
10900
10901 (defun gnus-summary-mark-article-as-forwarded (article)
10902   "Mark ARTICLE as forwarded and update the summary line.
10903 ARTICLE can also be a list of articles."
10904   (let ((articles (if (listp article) article (list article))))
10905     (dolist (article articles)
10906       (push article gnus-newsgroup-forwarded)
10907       (let ((inhibit-read-only t))
10908         (when (gnus-summary-goto-subject article nil t)
10909           (gnus-summary-update-secondary-mark article))))))
10910
10911 (defun gnus-summary-set-bookmark (article)
10912   "Set a bookmark in current article."
10913   (interactive (list (gnus-summary-article-number)))
10914   (when (or (not (get-buffer gnus-article-buffer))
10915             (not gnus-current-article)
10916             (not gnus-article-current)
10917             (not (equal gnus-newsgroup-name (car gnus-article-current))))
10918     (error "No current article selected"))
10919   ;; Remove old bookmark, if one exists.
10920   (gnus-alist-pull article gnus-newsgroup-bookmarks)
10921   ;; Set the new bookmark, which is on the form
10922   ;; (article-number . line-number-in-body).
10923   (push
10924    (cons article
10925          (with-current-buffer gnus-article-buffer
10926            (count-lines
10927             (min (point)
10928                  (save-excursion
10929                    (article-goto-body)
10930                    (point)))
10931             (point))))
10932    gnus-newsgroup-bookmarks)
10933   (gnus-message 6 "A bookmark has been added to the current article."))
10934
10935 (defun gnus-summary-remove-bookmark (article)
10936   "Remove the bookmark from the current article."
10937   (interactive (list (gnus-summary-article-number)))
10938   ;; Remove old bookmark, if one exists.
10939   (if (not (assq article gnus-newsgroup-bookmarks))
10940       (gnus-message 6 "No bookmark in current article.")
10941     (gnus-alist-pull article gnus-newsgroup-bookmarks)
10942     (gnus-message 6 "Removed bookmark.")))
10943
10944 ;; Suggested by Daniel Quinlan <quinlan@best.com>.
10945 (defun gnus-summary-mark-as-dormant (n)
10946   "Mark N articles forward as dormant.
10947 If N is negative, mark backward instead.  The difference between N and
10948 the actual number of articles marked is returned."
10949   (interactive "p")
10950   (gnus-summary-mark-forward n gnus-dormant-mark))
10951
10952 (defun gnus-summary-set-process-mark (article)
10953   "Set the process mark on ARTICLE and update the summary line."
10954   (setq gnus-newsgroup-processable
10955         (cons article
10956               (delq article gnus-newsgroup-processable)))
10957   (when (gnus-summary-goto-subject article)
10958     (gnus-summary-show-thread)
10959     (gnus-summary-goto-subject article)
10960     (gnus-summary-update-secondary-mark article)))
10961
10962 (defun gnus-summary-remove-process-mark (&rest articles)
10963   "Remove the process mark from ARTICLES and update the summary line."
10964   (dolist (article articles)
10965     (setq gnus-newsgroup-processable (delq article gnus-newsgroup-processable))
10966     (when (gnus-summary-goto-subject article)
10967       (gnus-summary-show-thread)
10968       (gnus-summary-goto-subject article)
10969       (gnus-summary-update-secondary-mark article)))
10970   t)
10971
10972 (defun gnus-summary-set-saved-mark (article)
10973   "Set the process mark on ARTICLE and update the summary line."
10974   (push article gnus-newsgroup-saved)
10975   (when (gnus-summary-goto-subject article)
10976     (gnus-summary-update-secondary-mark article)))
10977
10978 (defun gnus-summary-mark-forward (n &optional mark no-expire)
10979   "Mark N articles as read forwards.
10980 If N is negative, mark backwards instead.  Mark with MARK, ?r by default.
10981 The difference between N and the actual number of articles marked is
10982 returned.
10983 If NO-EXPIRE, auto-expiry will be inhibited."
10984   (interactive "p")
10985   (gnus-summary-show-thread)
10986   (let ((backward (< n 0))
10987         (gnus-summary-goto-unread
10988          (and gnus-summary-goto-unread
10989               (not (eq gnus-summary-goto-unread 'never))
10990               (not (memq mark (list gnus-unread-mark gnus-spam-mark
10991                                     gnus-ticked-mark gnus-dormant-mark)))))
10992         (n (abs n))
10993         (mark (or mark gnus-del-mark)))
10994     (while (and (> n 0)
10995                 (gnus-summary-mark-article nil mark no-expire)
10996                 (zerop (gnus-summary-next-subject
10997                         (if backward -1 1)
10998                         (and gnus-summary-goto-unread
10999                              (not (eq gnus-summary-goto-unread 'never)))
11000                         t)))
11001       (setq n (1- n)))
11002     (when (/= 0 n)
11003       (gnus-message 7 "No more %sarticles" (if mark "" "unread ")))
11004     (gnus-summary-recenter)
11005     (gnus-summary-position-point)
11006     (gnus-set-mode-line 'summary)
11007     n))
11008
11009 (defun gnus-summary-mark-article-as-read (mark)
11010   "Mark the current article quickly as read with MARK."
11011   (let ((article (gnus-summary-article-number)))
11012     (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
11013     (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
11014     (setq gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked))
11015     (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
11016     (push (cons article mark) gnus-newsgroup-reads)
11017     ;; Possibly remove from cache, if that is used.
11018     (when gnus-use-cache
11019       (gnus-cache-enter-remove-article article))
11020     ;; Allow the backend to change the mark.
11021     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
11022     ;; Check for auto-expiry.
11023     (when (and gnus-newsgroup-auto-expire
11024                (memq mark gnus-auto-expirable-marks))
11025       (setq mark gnus-expirable-mark)
11026       ;; Let the backend know about the mark change.
11027       (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
11028       (push article gnus-newsgroup-expirable))
11029     ;; Set the mark in the buffer.
11030     (gnus-summary-update-mark mark 'unread)
11031     t))
11032
11033 (defun gnus-summary-mark-article-as-unread (mark)
11034   "Mark the current article quickly as unread with MARK."
11035   (let* ((article (gnus-summary-article-number))
11036          (old-mark (gnus-summary-article-mark article)))
11037     ;; Allow the backend to change the mark.
11038     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
11039     (if (eq mark old-mark)
11040         t
11041       (if (<= article 0)
11042           (progn
11043             (gnus-error 1 "Can't mark negative article numbers")
11044             nil)
11045         (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
11046         (setq gnus-newsgroup-spam-marked
11047               (delq article gnus-newsgroup-spam-marked))
11048         (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
11049         (setq gnus-newsgroup-expirable (delq article gnus-newsgroup-expirable))
11050         (setq gnus-newsgroup-reads (delq article gnus-newsgroup-reads))
11051         (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
11052         (cond ((= mark gnus-ticked-mark)
11053                (setq gnus-newsgroup-marked
11054                      (gnus-add-to-sorted-list gnus-newsgroup-marked
11055                                               article)))
11056               ((= mark gnus-spam-mark)
11057                (setq gnus-newsgroup-spam-marked
11058                      (gnus-add-to-sorted-list gnus-newsgroup-spam-marked
11059                                               article)))
11060               ((= mark gnus-dormant-mark)
11061                (setq gnus-newsgroup-dormant
11062                      (gnus-add-to-sorted-list gnus-newsgroup-dormant
11063                                               article)))
11064               (t
11065                (setq gnus-newsgroup-unreads
11066                      (gnus-add-to-sorted-list gnus-newsgroup-unreads
11067                                               article))))
11068         (gnus-alist-pull article gnus-newsgroup-reads)
11069
11070         ;; See whether the article is to be put in the cache.
11071         (and gnus-use-cache
11072              (vectorp (gnus-summary-article-header article))
11073              (save-excursion
11074                (gnus-cache-possibly-enter-article
11075                 gnus-newsgroup-name article
11076                 (= mark gnus-ticked-mark)
11077                 (= mark gnus-dormant-mark) (= mark gnus-unread-mark))))
11078
11079         ;; Fix the mark.
11080         (gnus-summary-update-mark mark 'unread)
11081         t))))
11082
11083 (defun gnus-summary-mark-article (&optional article mark no-expire)
11084   "Mark ARTICLE with MARK.  MARK can be any character.
11085 Four MARK strings are reserved: `? ' (unread), `?!' (ticked),
11086 `??' (dormant) and `?E' (expirable).
11087 If MARK is nil, then the default character `?r' is used.
11088 If ARTICLE is nil, then the article on the current line will be
11089 marked.
11090 If NO-EXPIRE, auto-expiry will be inhibited."
11091   ;; The mark might be a string.
11092   (when (stringp mark)
11093     (setq mark (aref mark 0)))
11094   ;; If no mark is given, then we check auto-expiring.
11095   (when (null mark)
11096     (setq mark gnus-del-mark))
11097   (when (and (not no-expire)
11098              gnus-newsgroup-auto-expire
11099              (memq mark gnus-auto-expirable-marks))
11100     (setq mark gnus-expirable-mark))
11101   (let ((article (or article (gnus-summary-article-number)))
11102         (old-mark (gnus-summary-article-mark article)))
11103     ;; Allow the backend to change the mark.
11104     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
11105     (if (eq mark old-mark)
11106         t
11107       (unless article
11108         (error "No article on current line"))
11109       (if (not (if (or (= mark gnus-unread-mark)
11110                        (= mark gnus-ticked-mark)
11111                        (= mark gnus-spam-mark)
11112                        (= mark gnus-dormant-mark))
11113                    (gnus-mark-article-as-unread article mark)
11114                  (gnus-mark-article-as-read article mark)))
11115           t
11116         ;; See whether the article is to be put in the cache.
11117         (and gnus-use-cache
11118              (not (= mark gnus-canceled-mark))
11119              (vectorp (gnus-summary-article-header article))
11120              (save-excursion
11121                (gnus-cache-possibly-enter-article
11122                 gnus-newsgroup-name article
11123                 (= mark gnus-ticked-mark)
11124                 (= mark gnus-dormant-mark) (= mark gnus-unread-mark))))
11125
11126         (when (gnus-summary-goto-subject article nil t)
11127           (let ((inhibit-read-only t))
11128             (gnus-summary-show-thread)
11129             ;; Fix the mark.
11130             (gnus-summary-update-mark mark 'unread)
11131             t))))))
11132
11133 (defun gnus-summary-update-secondary-mark (article)
11134   "Update the secondary (read, process, cache) mark."
11135   (gnus-summary-update-mark
11136    (cond ((memq article gnus-newsgroup-processable)
11137           gnus-process-mark)
11138          ((memq article gnus-newsgroup-cached)
11139           gnus-cached-mark)
11140          ((memq article gnus-newsgroup-replied)
11141           gnus-replied-mark)
11142          ((memq article gnus-newsgroup-forwarded)
11143           gnus-forwarded-mark)
11144          ((memq article gnus-newsgroup-saved)
11145           gnus-saved-mark)
11146          ((memq article gnus-newsgroup-unseen)
11147           gnus-unseen-mark)
11148          (t gnus-no-mark))
11149    'replied)
11150   (when (gnus-visual-p 'summary-highlight 'highlight)
11151     (gnus-summary-highlight-line)
11152     (gnus-run-hooks 'gnus-summary-update-hook))
11153   t)
11154
11155 (defun gnus-summary-update-download-mark (article)
11156   "Update the download mark."
11157   (gnus-summary-update-mark
11158    (cond ((memq article gnus-newsgroup-undownloaded)
11159           gnus-undownloaded-mark)
11160          (gnus-newsgroup-agentized
11161           gnus-downloaded-mark)
11162          (t
11163           gnus-no-mark))
11164    'download)
11165   (gnus-summary-update-line t)
11166   t)
11167
11168 (defun gnus-summary-update-mark (mark type)
11169   (let ((forward (cdr (assq type gnus-summary-mark-positions)))
11170         (inhibit-read-only t))
11171     (re-search-backward "[\n\r]" (point-at-bol) 'move-to-limit)
11172     (when forward
11173       (when (looking-at "\r")
11174         (incf forward))
11175       (when (<= (+ forward (point)) (point-max))
11176         ;; Go to the right position on the line.
11177         (goto-char (+ forward (point)))
11178         ;; Replace the old mark with the new mark.
11179         (let ((to-insert
11180                (mm-subst-char-in-string
11181                 (char-after) mark
11182                 (buffer-substring (point) (1+ (point))))))
11183           (delete-region (point) (1+ (point)))
11184           (insert to-insert))
11185         ;; Optionally update the marks by some user rule.
11186         (when (eq type 'unread)
11187           (gnus-data-set-mark
11188            (gnus-data-find (gnus-summary-article-number)) mark)
11189           (gnus-summary-update-line (eq mark gnus-unread-mark)))))))
11190
11191 (defun gnus-mark-article-as-read (article &optional mark)
11192   "Enter ARTICLE in the pertinent lists and remove it from others."
11193   ;; Make the article expirable.
11194   (let ((mark (or mark gnus-del-mark)))
11195     (setq gnus-newsgroup-expirable
11196           (if (= mark gnus-expirable-mark)
11197               (gnus-add-to-sorted-list gnus-newsgroup-expirable article)
11198             (delq article gnus-newsgroup-expirable)))
11199     ;; Remove from unread and marked lists.
11200     (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
11201     (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
11202     (setq gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked))
11203     (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
11204     (push (cons article mark) gnus-newsgroup-reads)
11205     ;; Possibly remove from cache, if that is used.
11206     (when gnus-use-cache
11207       (gnus-cache-enter-remove-article article))
11208     t))
11209
11210 (defun gnus-mark-article-as-unread (article &optional mark)
11211   "Enter ARTICLE in the pertinent lists and remove it from others."
11212   (let ((mark (or mark gnus-ticked-mark)))
11213     (if (<= article 0)
11214         (progn
11215           (gnus-error 1 "Can't mark negative article numbers")
11216           nil)
11217       (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked)
11218             gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked)
11219             gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant)
11220             gnus-newsgroup-expirable (delq article gnus-newsgroup-expirable)
11221             gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
11222
11223       ;; Unsuppress duplicates?
11224       (when gnus-suppress-duplicates
11225         (gnus-dup-unsuppress-article article))
11226
11227       (cond ((= mark gnus-ticked-mark)
11228              (setq gnus-newsgroup-marked
11229                    (gnus-add-to-sorted-list gnus-newsgroup-marked article)))
11230             ((= mark gnus-spam-mark)
11231              (setq gnus-newsgroup-spam-marked
11232                    (gnus-add-to-sorted-list gnus-newsgroup-spam-marked
11233                                             article)))
11234             ((= mark gnus-dormant-mark)
11235              (setq gnus-newsgroup-dormant
11236                    (gnus-add-to-sorted-list gnus-newsgroup-dormant article)))
11237             (t
11238              (setq gnus-newsgroup-unreads
11239                    (gnus-add-to-sorted-list gnus-newsgroup-unreads article))))
11240       (gnus-alist-pull article gnus-newsgroup-reads)
11241       t)))
11242
11243 (defun gnus-summary-tick-article-forward (n)
11244   "Tick N articles forwards.
11245 If N is negative, tick backwards instead.
11246 The difference between N and the number of articles ticked is returned."
11247   (interactive "p")
11248   (gnus-summary-mark-forward n gnus-ticked-mark))
11249
11250 (defun gnus-summary-tick-article-backward (n)
11251   "Tick N articles backwards.
11252 The difference between N and the number of articles ticked is returned."
11253   (interactive "p")
11254   (gnus-summary-mark-forward (- n) gnus-ticked-mark))
11255
11256 (defun gnus-summary-tick-article (&optional article clear-mark)
11257   "Mark current article as unread.
11258 Optional 1st argument ARTICLE specifies article number to be marked as unread.
11259 Optional 2nd argument CLEAR-MARK remove any kinds of mark."
11260   (interactive)
11261   (gnus-summary-mark-article article (if clear-mark gnus-unread-mark
11262                                        gnus-ticked-mark)))
11263
11264 (defun gnus-summary-mark-as-read-forward (n)
11265   "Mark N articles as read forwards.
11266 If N is negative, mark backwards instead.
11267 The difference between N and the actual number of articles marked is
11268 returned."
11269   (interactive "p")
11270   (gnus-summary-mark-forward n gnus-del-mark gnus-inhibit-user-auto-expire))
11271
11272 (defun gnus-summary-mark-as-read-backward (n)
11273   "Mark the N articles as read backwards.
11274 The difference between N and the actual number of articles marked is
11275 returned."
11276   (interactive "p")
11277   (gnus-summary-mark-forward
11278    (- n) gnus-del-mark gnus-inhibit-user-auto-expire))
11279
11280 (defun gnus-summary-mark-as-read (&optional article mark)
11281   "Mark current article as read.
11282 ARTICLE specifies the article to be marked as read.
11283 MARK specifies a string to be inserted at the beginning of the line."
11284   (gnus-summary-mark-article article mark))
11285
11286 (defun gnus-summary-clear-mark-forward (n)
11287   "Clear marks from N articles forward.
11288 If N is negative, clear backward instead.
11289 The difference between N and the number of marks cleared is returned."
11290   (interactive "p")
11291   (gnus-summary-mark-forward n gnus-unread-mark))
11292
11293 (defun gnus-summary-clear-mark-backward (n)
11294   "Clear marks from N articles backward.
11295 The difference between N and the number of marks cleared is returned."
11296   (interactive "p")
11297   (gnus-summary-mark-forward (- n) gnus-unread-mark))
11298
11299 (defun gnus-summary-mark-unread-as-read ()
11300   "Intended to be used by `gnus-mark-article-hook'."
11301   (when (memq gnus-current-article gnus-newsgroup-unreads)
11302     (gnus-summary-mark-article gnus-current-article gnus-read-mark)))
11303
11304 (defun gnus-summary-mark-read-and-unread-as-read (&optional new-mark)
11305   "Intended to be used by `gnus-mark-article-hook'."
11306   (let ((mark (gnus-summary-article-mark)))
11307     (when (or (gnus-unread-mark-p mark)
11308               (gnus-read-mark-p mark))
11309       (gnus-summary-mark-article gnus-current-article
11310                                  (or new-mark gnus-read-mark)))))
11311
11312 (defun gnus-summary-mark-current-read-and-unread-as-read (&optional new-mark)
11313   "Intended to be used by `gnus-mark-article-hook'."
11314   (let ((mark (gnus-summary-article-mark)))
11315     (when (or (gnus-unread-mark-p mark)
11316               (gnus-read-mark-p mark))
11317       (gnus-summary-mark-article (gnus-summary-article-number)
11318                                  (or new-mark gnus-read-mark)))))
11319
11320 (defun gnus-summary-mark-unread-as-ticked ()
11321   "Intended to be used by `gnus-mark-article-hook'."
11322   (when (memq gnus-current-article gnus-newsgroup-unreads)
11323     (gnus-summary-mark-article gnus-current-article gnus-ticked-mark)))
11324
11325 (defun gnus-summary-mark-region-as-read (point mark all)
11326   "Mark all unread articles between point and mark as read.
11327 If given a prefix, mark all articles between point and mark as read,
11328 even ticked and dormant ones."
11329   (interactive "r\nP")
11330   (save-excursion
11331     (let (article)
11332       (goto-char point)
11333       (beginning-of-line)
11334       (while (and
11335               (< (point) mark)
11336               (progn
11337                 (when (or all
11338                           (memq (setq article (gnus-summary-article-number))
11339                                 gnus-newsgroup-unreads))
11340                   (gnus-summary-mark-article article gnus-del-mark))
11341                 t)
11342               (gnus-summary-find-next))))))
11343
11344 (defun gnus-summary-mark-below (score mark)
11345   "Mark articles with score less than SCORE with MARK."
11346   (interactive "P\ncMark: ")
11347   (setq score (if score
11348                   (prefix-numeric-value score)
11349                 (or gnus-summary-default-score 0)))
11350   (with-current-buffer gnus-summary-buffer
11351     (goto-char (point-min))
11352     (while
11353         (progn
11354           (and (< (gnus-summary-article-score) score)
11355                (gnus-summary-mark-article nil mark))
11356           (gnus-summary-find-next)))))
11357
11358 (defun gnus-summary-kill-below (&optional score)
11359   "Mark articles with score below SCORE as read."
11360   (interactive "P")
11361   (gnus-summary-mark-below score gnus-killed-mark))
11362
11363 (defun gnus-summary-clear-above (&optional score)
11364   "Clear all marks from articles with score above SCORE."
11365   (interactive "P")
11366   (gnus-summary-mark-above score gnus-unread-mark))
11367
11368 (defun gnus-summary-tick-above (&optional score)
11369   "Tick all articles with score above SCORE."
11370   (interactive "P")
11371   (gnus-summary-mark-above score gnus-ticked-mark))
11372
11373 (defun gnus-summary-mark-above (score mark)
11374   "Mark articles with score over SCORE with MARK."
11375   (interactive "P\ncMark: ")
11376   (setq score (if score
11377                   (prefix-numeric-value score)
11378                 (or gnus-summary-default-score 0)))
11379   (with-current-buffer gnus-summary-buffer
11380     (goto-char (point-min))
11381     (while (and (progn
11382                   (when (> (gnus-summary-article-score) score)
11383                     (gnus-summary-mark-article nil mark))
11384                   t)
11385                 (gnus-summary-find-next)))))
11386
11387 ;; Suggested by Daniel Quinlan <quinlan@best.com>.
11388 (defalias 'gnus-summary-show-all-expunged 'gnus-summary-limit-include-expunged)
11389 (defun gnus-summary-limit-include-expunged (&optional no-error)
11390   "Display all the hidden articles that were expunged for low scores."
11391   (interactive)
11392   (let ((inhibit-read-only t))
11393     (let ((scored gnus-newsgroup-scored)
11394           headers h)
11395       (while scored
11396         (unless (gnus-summary-article-header (caar scored))
11397           (and (setq h (gnus-number-to-header (caar scored)))
11398                (< (cdar scored) gnus-summary-expunge-below)
11399                (push h headers)))
11400         (setq scored (cdr scored)))
11401       (if (not headers)
11402           (when (not no-error)
11403             (error "No expunged articles hidden"))
11404         (goto-char (point-min))
11405         (push gnus-newsgroup-limit gnus-newsgroup-limits)
11406         (setq gnus-newsgroup-limit (copy-sequence gnus-newsgroup-limit))
11407         (dolist (x headers)
11408           (push (mail-header-number x) gnus-newsgroup-limit))
11409         (gnus-summary-prepare-unthreaded (nreverse headers))
11410         (goto-char (point-min))
11411         (gnus-summary-position-point)
11412         t))))
11413
11414 (defun gnus-summary-catchup (&optional all quietly to-here not-mark reverse)
11415   "Mark all unread articles in this newsgroup as read.
11416 If prefix argument ALL is non-nil, ticked and dormant articles will
11417 also be marked as read.
11418 If QUIETLY is non-nil, no questions will be asked.
11419
11420 If TO-HERE is non-nil, it should be a point in the buffer.  All
11421 articles before (after, if REVERSE is set) this point will be marked
11422 as read.
11423
11424 Note that this function will only catch up the unread article
11425 in the current summary buffer limitation.
11426
11427 The number of articles marked as read is returned."
11428   (interactive "P")
11429   (prog1
11430       (save-excursion
11431         (when (or quietly
11432                   (not gnus-interactive-catchup) ;Without confirmation?
11433                   gnus-expert-user
11434                   (gnus-y-or-n-p
11435                    (if all
11436                        "Mark absolutely all articles as read? "
11437                      "Mark all unread articles as read? ")))
11438           (if (and not-mark
11439                    (not gnus-newsgroup-adaptive)
11440                    (not gnus-newsgroup-auto-expire)
11441                    (not gnus-suppress-duplicates)
11442                    (or (not gnus-use-cache)
11443                        (eq gnus-use-cache 'passive)))
11444               (progn
11445                 (when all
11446                   (setq gnus-newsgroup-marked nil
11447                         gnus-newsgroup-spam-marked nil
11448                         gnus-newsgroup-dormant nil))
11449                 (setq gnus-newsgroup-unreads
11450                       (gnus-sorted-nunion
11451                        (gnus-sorted-intersection gnus-newsgroup-unreads
11452                                                  gnus-newsgroup-downloadable)
11453                        (gnus-sorted-difference gnus-newsgroup-unfetched
11454                                                gnus-newsgroup-cached))))
11455             ;; We actually mark all articles as canceled, which we
11456             ;; have to do when using auto-expiry or adaptive scoring.
11457             (gnus-summary-show-all-threads)
11458             (if (and to-here reverse)
11459                 (progn
11460                   (goto-char to-here)
11461                   (gnus-summary-mark-current-read-and-unread-as-read
11462                    gnus-catchup-mark)
11463                   (while (gnus-summary-find-next (not all))
11464                     (gnus-summary-mark-article-as-read gnus-catchup-mark)))
11465               (when (gnus-summary-first-subject (not all))
11466                 (while (and
11467                         (if to-here (< (point) to-here) t)
11468                         (gnus-summary-mark-article-as-read gnus-catchup-mark)
11469                         (gnus-summary-find-next (not all))))))
11470             (gnus-set-mode-line 'summary))
11471           t))
11472     (gnus-summary-position-point)))
11473
11474 (defun gnus-summary-catchup-to-here (&optional all)
11475   "Mark all unticked articles before the current one as read.
11476 If ALL is non-nil, also mark ticked and dormant articles as read."
11477   (interactive "P")
11478   (save-excursion
11479     (gnus-save-hidden-threads
11480       (let ((beg (point)))
11481         ;; We check that there are unread articles.
11482         (when (or all (gnus-summary-find-prev))
11483           (gnus-summary-catchup all t beg)))))
11484   (gnus-summary-position-point))
11485
11486 (defun gnus-summary-catchup-from-here (&optional all)
11487   "Mark all unticked articles after (and including) the current one as read.
11488 If ALL is non-nil, also mark ticked and dormant articles as read."
11489   (interactive "P")
11490   (save-excursion
11491     (gnus-save-hidden-threads
11492       (let ((beg (point)))
11493         ;; We check that there are unread articles.
11494         (when (or all (gnus-summary-find-next))
11495           (gnus-summary-catchup all t beg nil t)))))
11496   (gnus-summary-position-point))
11497
11498 (defun gnus-summary-catchup-all (&optional quietly)
11499   "Mark all articles in this newsgroup as read.
11500 This command is dangerous.  Normally, you want \\[gnus-summary-catchup]
11501 instead, which marks only unread articles as read."
11502   (interactive "P")
11503   (gnus-summary-catchup t quietly))
11504
11505 (defun gnus-summary-catchup-and-exit (&optional all quietly)
11506   "Mark all unread articles in this group as read, then exit.
11507 If prefix argument ALL is non-nil, all articles are marked as read.
11508 If QUIETLY is non-nil, no questions will be asked."
11509   (interactive "P")
11510   (when (gnus-summary-catchup all quietly nil 'fast)
11511     ;; Select next newsgroup or exit.
11512     (if (and (not (gnus-group-quit-config gnus-newsgroup-name))
11513              (eq gnus-auto-select-next 'quietly))
11514         (gnus-summary-next-group nil)
11515       (gnus-summary-exit))))
11516
11517 (defun gnus-summary-catchup-all-and-exit (&optional quietly)
11518   "Mark all articles in this newsgroup as read, and then exit.
11519 This command is dangerous.  Normally, you want \\[gnus-summary-catchup-and-exit]
11520 instead, which marks only unread articles as read."
11521   (interactive "P")
11522   (gnus-summary-catchup-and-exit t quietly))
11523
11524 (defun gnus-summary-catchup-and-goto-next-group (&optional all)
11525   "Mark all articles in this group as read and select the next group.
11526 If given a prefix, mark all articles, unread as well as ticked, as
11527 read."
11528   (interactive "P")
11529   (save-excursion
11530     (gnus-summary-catchup all))
11531   (gnus-summary-next-group))
11532
11533 (defun gnus-summary-catchup-and-goto-prev-group (&optional all)
11534   "Mark all articles in this group as read and select the previous group.
11535 If given a prefix, mark all articles, unread as well as ticked, as
11536 read."
11537   (interactive "P")
11538   (save-excursion
11539     (gnus-summary-catchup all))
11540   (gnus-summary-next-group nil nil t))
11541
11542 ;;;
11543 ;;; with article
11544 ;;;
11545
11546 (defmacro gnus-with-article (article &rest forms)
11547   "Select ARTICLE and perform FORMS in the original article buffer.
11548 Then replace the article with the result."
11549   `(progn
11550      ;; We don't want the article to be marked as read.
11551      (let (gnus-mark-article-hook)
11552        (gnus-summary-select-article t t nil ,article))
11553      (set-buffer gnus-original-article-buffer)
11554      ,@forms
11555      (if (not (gnus-check-backend-function
11556                'request-replace-article (car gnus-article-current)))
11557          (gnus-message 5 "Read-only group; not replacing")
11558        (unless (gnus-request-replace-article
11559                 ,article (car gnus-article-current)
11560                 (current-buffer) t)
11561          (error "Couldn't replace article")))
11562      ;; The cache and backlog have to be flushed somewhat.
11563      (when gnus-keep-backlog
11564        (gnus-backlog-remove-article
11565         (car gnus-article-current) (cdr gnus-article-current)))
11566      (when gnus-use-cache
11567        (gnus-cache-update-article
11568         (car gnus-article-current) (cdr gnus-article-current)))))
11569
11570 (put 'gnus-with-article 'lisp-indent-function 1)
11571 (put 'gnus-with-article 'edebug-form-spec '(form body))
11572
11573 ;; Thread-based commands.
11574
11575 (defun gnus-summary-articles-in-thread (&optional article)
11576   "Return a list of all articles in the current thread.
11577 If ARTICLE is non-nil, return all articles in the thread that starts
11578 with that article."
11579   (let* ((article (or article (gnus-summary-article-number)))
11580          (data (gnus-data-find-list article))
11581          (top-level (gnus-data-level (car data)))
11582          (top-subject
11583           (cond ((null gnus-thread-operation-ignore-subject)
11584                  (gnus-simplify-subject-re
11585                   (mail-header-subject (gnus-data-header (car data)))))
11586                 ((eq gnus-thread-operation-ignore-subject 'fuzzy)
11587                  (gnus-simplify-subject-fuzzy
11588                   (mail-header-subject (gnus-data-header (car data)))))
11589                 (t nil)))
11590          (end-point (save-excursion
11591                       (goto-char (gnus-data-pos (car data)))
11592                       (if (gnus-summary-go-to-next-thread)
11593                           (point) (point-max))))
11594          articles)
11595     (while (and data
11596                 (< (gnus-data-pos (car data)) end-point))
11597       (when (or (not top-subject)
11598                 (string= top-subject
11599                          (if (eq gnus-thread-operation-ignore-subject 'fuzzy)
11600                              (gnus-simplify-subject-fuzzy
11601                               (mail-header-subject
11602                                (gnus-data-header (car data))))
11603                            (gnus-simplify-subject-re
11604                             (mail-header-subject
11605                              (gnus-data-header (car data)))))))
11606         (push (gnus-data-number (car data)) articles))
11607       (unless (and (setq data (cdr data))
11608                    (> (gnus-data-level (car data)) top-level))
11609         (setq data nil)))
11610     ;; Return the list of articles.
11611     (nreverse articles)))
11612
11613 (defun gnus-summary-rethread-current ()
11614   "Rethread the thread the current article is part of."
11615   (interactive)
11616   (let* ((gnus-show-threads t)
11617          (article (gnus-summary-article-number))
11618          (id (mail-header-id (gnus-summary-article-header)))
11619          (gnus-newsgroup-threads (list (gnus-id-to-thread (gnus-root-id id)))))
11620     (unless id
11621       (error "No article on the current line"))
11622     (gnus-rebuild-thread id)
11623     (gnus-summary-goto-subject article)))
11624
11625 (defun gnus-summary-reparent-thread ()
11626   "Make the current article child of the marked (or previous) article.
11627
11628 Note that the re-threading will only work if `gnus-thread-ignore-subject'
11629 is non-nil or the Subject: of both articles are the same."
11630   (interactive)
11631   (unless (not (gnus-group-read-only-p))
11632     (error "The current newsgroup does not support article editing"))
11633   (unless (<= (length gnus-newsgroup-processable) 1)
11634     (error "No more than one article may be marked"))
11635   (let ((child (gnus-summary-article-number))
11636         ;; First grab the marked article, otherwise one line up.
11637         (parent (if (not (null gnus-newsgroup-processable))
11638                     (car gnus-newsgroup-processable)
11639                   (save-excursion
11640                     (if (eq (forward-line -1) 0)
11641                         (gnus-summary-article-number)
11642                       (error "Beginning of summary buffer"))))))
11643     (gnus-summary-reparent-children parent (list child))))
11644
11645 (defun gnus-summary-reparent-children (parent children)
11646   "Make PARENT the parent of CHILDREN.
11647 When called interactively, PARENT is the current article and CHILDREN
11648 are the process-marked articles."
11649   (interactive
11650    (list (gnus-summary-article-number)
11651          (gnus-summary-work-articles nil)))
11652   (dolist (child children)
11653     (save-window-excursion
11654       (let ((gnus-article-buffer " *reparent*"))
11655         (unless (not (eq parent child))
11656           (error "An article may not be self-referential"))
11657         (let ((message-id (mail-header-id
11658                            (gnus-summary-article-header parent))))
11659           (unless (and message-id (not (equal message-id "")))
11660             (error "No message-id in desired parent"))
11661           (gnus-with-article child
11662             (save-restriction
11663               (goto-char (point-min))
11664               (message-narrow-to-head)
11665               (if (re-search-forward "^References: " nil t)
11666                   (progn
11667                     (re-search-forward "^[^ \t]" nil t)
11668                     (forward-line -1)
11669                     (end-of-line)
11670                     (insert " " message-id))
11671                 (insert "References: " message-id "\n"))))
11672           (set-buffer gnus-summary-buffer)
11673           (gnus-summary-unmark-all-processable)
11674           (gnus-summary-update-article child)
11675           (when (gnus-summary-goto-subject (cdr gnus-article-current) nil t)
11676             (gnus-summary-update-secondary-mark (cdr gnus-article-current)))
11677           (gnus-summary-rethread-current)
11678           (gnus-message 3 "Article %d is now the child of article %d"
11679                         child parent))))))
11680
11681 (defun gnus-summary-toggle-threads (&optional arg)
11682   "Toggle showing conversation threads.
11683 If ARG is positive number, turn showing conversation threads on."
11684   (interactive "P")
11685   (let ((current (or (gnus-summary-article-number) gnus-newsgroup-end)))
11686     (setq gnus-show-threads
11687           (if (null arg) (not gnus-show-threads)
11688             (> (prefix-numeric-value arg) 0)))
11689     (gnus-summary-prepare)
11690     (gnus-summary-goto-subject current)
11691     (gnus-message 6 "Threading is now %s" (if gnus-show-threads "on" "off"))
11692     (gnus-summary-position-point)))
11693
11694 (eval-and-compile
11695   (if (fboundp 'remove-overlays)
11696       (defalias 'gnus-remove-overlays 'remove-overlays)
11697     (defun gnus-remove-overlays (beg end name val)
11698       "Clear BEG and END of overlays whose property NAME has value VAL.
11699 For compatibility with XEmacs."
11700       (dolist (ov (gnus-overlays-in beg end))
11701         (when (eq (gnus-overlay-get ov name) val)
11702           (gnus-delete-overlay ov))))))
11703
11704 (defun gnus-summary-show-all-threads ()
11705   "Show all threads."
11706   (interactive)
11707   (gnus-remove-overlays (point-min) (point-max) 'invisible 'gnus-sum)
11708   (gnus-summary-position-point))
11709
11710 (defsubst gnus-summary--inv (p)
11711   (and (eq (get-char-property p 'invisible) 'gnus-sum) p))
11712
11713 (defun gnus-summary-show-thread ()
11714   "Show thread subtrees.
11715 Returns nil if no thread was there to be shown."
11716   (interactive)
11717   (let* ((orig (point))
11718          (end (point-at-eol))
11719          (end (or (gnus-summary--inv end) (gnus-summary--inv (1- end))))
11720          ;; Leave point at bol
11721          (beg (progn (beginning-of-line) (if (bobp) (point) (1- (point)))))
11722          (eoi (when end
11723                 (if (fboundp 'next-single-char-property-change)
11724                     ;; Note: XEmacs version of n-s-c-p-c may return nil
11725                     (or (next-single-char-property-change end 'invisible)
11726                         (point-max))
11727                   (while (progn
11728                            (end-of-line 2)
11729                            (and (not (eobp))
11730                                 (eq (get-char-property (point) 'invisible)
11731                                     'gnus-sum))))
11732                   (point)))))
11733     (when eoi
11734       (gnus-remove-overlays beg eoi 'invisible 'gnus-sum)
11735       (goto-char orig)
11736       (gnus-summary-position-point)
11737       eoi)))
11738
11739 (defun gnus-summary-maybe-hide-threads ()
11740   "If requested, hide the threads that should be hidden."
11741   (when (and gnus-show-threads
11742              gnus-thread-hide-subtree)
11743     (gnus-summary-hide-all-threads
11744      (if (or (consp gnus-thread-hide-subtree)
11745              (functionp gnus-thread-hide-subtree))
11746          (gnus-make-predicate gnus-thread-hide-subtree)
11747        nil))))
11748
11749 ;;; Hiding predicates.
11750
11751 (defun gnus-article-unread-p (header)
11752   (memq (mail-header-number header) gnus-newsgroup-unreads))
11753
11754 (defun gnus-article-unseen-p (header)
11755   (memq (mail-header-number header) gnus-newsgroup-unseen))
11756
11757 (defun gnus-map-articles (predicate articles)
11758   "Map PREDICATE over ARTICLES and return non-nil if any predicate is non-nil."
11759   (apply 'gnus-or (mapcar predicate
11760                           (mapcar (lambda (number)
11761                                     (gnus-summary-article-header number))
11762                                   articles))))
11763
11764 (defun gnus-summary-hide-all-threads (&optional predicate)
11765   "Hide all thread subtrees.
11766 If PREDICATE is supplied, threads that satisfy this predicate
11767 will not be hidden."
11768   (interactive)
11769   (save-excursion
11770     (goto-char (point-min))
11771     (let ((end nil)
11772           (count 0))
11773       (while (not end)
11774         (incf count)
11775         (when (zerop (mod count 1000))
11776           (message "Hiding all threads... %d" count))
11777         (when (or (not predicate)
11778                   (gnus-map-articles
11779                    predicate (gnus-summary-article-children)))
11780             (gnus-summary-hide-thread))
11781         (setq end (not (zerop (gnus-summary-next-thread 1 t)))))))
11782   (gnus-summary-position-point))
11783
11784 (defun gnus-summary-hide-thread ()
11785   "Hide thread subtrees.
11786 If PREDICATE is supplied, threads that satisfy this predicate
11787 will not be hidden.
11788 Returns nil if no threads were there to be hidden."
11789   (interactive)
11790   (beginning-of-line)
11791   (let ((start (point))
11792         (starteol (line-end-position))
11793         (article (gnus-summary-article-number)))
11794     ;; Go forward until either the buffer ends or the subthread ends.
11795     (when (and (not (eobp))
11796                (or (zerop (gnus-summary-next-thread 1 t))
11797                    (goto-char (point-max))))
11798       (if (and (> (point) start)
11799                ;; FIXME: this should actually search for a non-invisible \n.
11800                (search-backward "\n" start t))
11801           (progn
11802             (when (> (point) starteol)
11803               (gnus-remove-overlays starteol (point) 'invisible 'gnus-sum)
11804               (let ((ol (gnus-make-overlay starteol (point) nil t nil)))
11805                 (gnus-overlay-put ol 'invisible 'gnus-sum)
11806                 (gnus-overlay-put ol 'evaporate t)))
11807             (gnus-summary-goto-subject article)
11808             (when (> start (point))
11809               (message "Hiding the thread moved us backwards, aborting!")
11810               (goto-char (point-max))))
11811         (goto-char start)
11812         nil))))
11813
11814 (defun gnus-summary-go-to-next-thread (&optional previous)
11815   "Go to the same level (or less) next thread.
11816 If PREVIOUS is non-nil, go to previous thread instead.
11817 Return the article number moved to, or nil if moving was impossible."
11818   (let ((level (gnus-summary-thread-level))
11819         (way (if previous -1 1))
11820         (beg (point)))
11821     (forward-line way)
11822     (while (and (not (eobp))
11823                 (< level (gnus-summary-thread-level)))
11824       (forward-line way))
11825     (if (eobp)
11826         (progn
11827           (goto-char beg)
11828           nil)
11829       (setq beg (point))
11830       (prog1
11831           (gnus-summary-article-number)
11832         (goto-char beg)))))
11833
11834 (defun gnus-summary-next-thread (n &optional silent)
11835   "Go to the same level next N'th thread.
11836 If N is negative, search backward instead.
11837 Returns the difference between N and the number of skips actually
11838 done.
11839
11840 If SILENT, don't output messages."
11841   (interactive "p")
11842   (let ((backward (< n 0))
11843         (n (abs n)))
11844     (while (and (> n 0)
11845                 (gnus-summary-go-to-next-thread backward))
11846       (decf n))
11847     (unless silent
11848       (gnus-summary-position-point))
11849     (when (and (not silent) (/= 0 n))
11850       (gnus-message 7 "No more threads"))
11851     n))
11852
11853 (defun gnus-summary-prev-thread (n)
11854   "Go to the same level previous N'th thread.
11855 Returns the difference between N and the number of skips actually
11856 done."
11857   (interactive "p")
11858   (gnus-summary-next-thread (- n)))
11859
11860 (defun gnus-summary-go-down-thread ()
11861   "Go down one level in the current thread."
11862   (let ((children (gnus-summary-article-children)))
11863     (when children
11864       (gnus-summary-goto-subject (car children)))))
11865
11866 (defun gnus-summary-go-up-thread ()
11867   "Go up one level in the current thread."
11868   (let ((parent (gnus-summary-article-parent)))
11869     (when parent
11870       (gnus-summary-goto-subject parent))))
11871
11872 (defun gnus-summary-down-thread (n)
11873   "Go down thread N steps.
11874 If N is negative, go up instead.
11875 Returns the difference between N and how many steps down that were
11876 taken."
11877   (interactive "p")
11878   (let ((up (< n 0))
11879         (n (abs n)))
11880     (while (and (> n 0)
11881                 (if up (gnus-summary-go-up-thread)
11882                   (gnus-summary-go-down-thread)))
11883       (setq n (1- n)))
11884     (gnus-summary-position-point)
11885     (when (/= 0 n)
11886       (gnus-message 7 "Can't go further"))
11887     n))
11888
11889 (defun gnus-summary-up-thread (n)
11890   "Go up thread N steps.
11891 If N is negative, go down instead.
11892 Returns the difference between N and how many steps down that were
11893 taken."
11894   (interactive "p")
11895   (gnus-summary-down-thread (- n)))
11896
11897 (defun gnus-summary-top-thread ()
11898   "Go to the top of the thread."
11899   (interactive)
11900   (while (gnus-summary-go-up-thread))
11901   (gnus-summary-article-number))
11902
11903 (defun gnus-summary-expire-thread ()
11904   "Mark articles under current thread as expired."
11905   (interactive)
11906   (gnus-summary-kill-thread 0))
11907
11908 (defun gnus-summary-kill-thread (&optional unmark)
11909   "Mark articles under current thread as read.
11910 If the prefix argument is positive, remove any kinds of marks.
11911 If the prefix argument is zero, mark thread as expired.
11912 If the prefix argument is negative, tick articles instead."
11913   (interactive "P")
11914   (when unmark
11915     (setq unmark (prefix-numeric-value unmark)))
11916   (let ((articles (gnus-summary-articles-in-thread))
11917         (hide (or (null unmark) (= unmark 0))))
11918     (save-excursion
11919       ;; Expand the thread.
11920       (gnus-summary-show-thread)
11921       ;; Mark all the articles.
11922       (while articles
11923         (gnus-summary-goto-subject (car articles))
11924         (cond ((null unmark)
11925                (gnus-summary-mark-article-as-read gnus-killed-mark))
11926               ((> unmark 0)
11927                (gnus-summary-mark-article-as-unread gnus-unread-mark))
11928               ((= unmark 0)
11929                (gnus-summary-mark-article nil gnus-expirable-mark))
11930               (t
11931                (gnus-summary-mark-article-as-unread gnus-ticked-mark)))
11932         (setq articles (cdr articles))))
11933     ;; Hide killed subtrees when hide is true.
11934     (and hide
11935          gnus-thread-hide-killed
11936          (gnus-summary-hide-thread))
11937     ;; If hide is t, go to next unread subject.
11938     (when hide
11939       ;; Go to next unread subject.
11940       (gnus-summary-next-subject 1 t)))
11941   (gnus-set-mode-line 'summary))
11942
11943 ;; Summary sorting commands
11944
11945 (defun gnus-summary-sort-by-number (&optional reverse)
11946   "Sort the summary buffer by article number.
11947 Argument REVERSE means reverse order."
11948   (interactive "P")
11949   (gnus-summary-sort 'number reverse))
11950
11951 (defun gnus-summary-sort-by-most-recent-number (&optional reverse)
11952   "Sort the summary buffer by most recent article number.
11953 Argument REVERSE means reverse order."
11954   (interactive "P")
11955   (gnus-summary-sort 'most-recent-number reverse))
11956
11957 (defun gnus-summary-sort-by-random (&optional reverse)
11958   "Randomize the order in the summary buffer.
11959 Argument REVERSE means to randomize in reverse order."
11960   (interactive "P")
11961   (gnus-summary-sort 'random reverse))
11962
11963 (defun gnus-summary-sort-by-author (&optional reverse)
11964   "Sort the summary buffer by author name alphabetically.
11965 If `case-fold-search' is non-nil, case of letters is ignored.
11966 Argument REVERSE means reverse order."
11967   (interactive "P")
11968   (gnus-summary-sort 'author reverse))
11969
11970 (defun gnus-summary-sort-by-recipient (&optional reverse)
11971   "Sort the summary buffer by recipient name alphabetically.
11972 If `case-fold-search' is non-nil, case of letters is ignored.
11973 Argument REVERSE means reverse order."
11974   (interactive "P")
11975   (gnus-summary-sort 'recipient reverse))
11976
11977 (defun gnus-summary-sort-by-subject (&optional reverse)
11978   "Sort the summary buffer by subject alphabetically.  `Re:'s are ignored.
11979 If `case-fold-search' is non-nil, case of letters is ignored.
11980 Argument REVERSE means reverse order."
11981   (interactive "P")
11982   (gnus-summary-sort 'subject reverse))
11983
11984 (defun gnus-summary-sort-by-date (&optional reverse)
11985   "Sort the summary buffer by date.
11986 Argument REVERSE means reverse order."
11987   (interactive "P")
11988   (gnus-summary-sort 'date reverse))
11989
11990 (defun gnus-summary-sort-by-most-recent-date (&optional reverse)
11991   "Sort the summary buffer by most recent date.
11992 Argument REVERSE means reverse order."
11993   (interactive "P")
11994   (gnus-summary-sort 'most-recent-date reverse))
11995
11996 (defun gnus-summary-sort-by-score (&optional reverse)
11997   "Sort the summary buffer by score.
11998 Argument REVERSE means reverse order."
11999   (interactive "P")
12000   (gnus-summary-sort 'score reverse))
12001
12002 (defun gnus-summary-sort-by-lines (&optional reverse)
12003   "Sort the summary buffer by the number of lines.
12004 Argument REVERSE means reverse order."
12005   (interactive "P")
12006   (gnus-summary-sort 'lines reverse))
12007
12008 (defun gnus-summary-sort-by-chars (&optional reverse)
12009   "Sort the summary buffer by article length.
12010 Argument REVERSE means reverse order."
12011   (interactive "P")
12012   (gnus-summary-sort 'chars reverse))
12013
12014 (defun gnus-summary-sort-by-original (&optional reverse)
12015   "Sort the summary buffer using the default sorting method.
12016 Argument REVERSE means reverse order."
12017   (interactive "P")
12018   (let* ((inhibit-read-only t)
12019          (gnus-summary-prepare-hook nil))
12020     ;; We do the sorting by regenerating the threads.
12021     (gnus-summary-prepare)
12022     ;; Hide subthreads if needed.
12023     (gnus-summary-maybe-hide-threads)))
12024
12025 (defun gnus-summary-sort (predicate reverse)
12026   "Sort summary buffer by PREDICATE.  REVERSE means reverse order."
12027   (let* ((thread (intern (format "gnus-thread-sort-by-%s" predicate)))
12028          (article (intern (format "gnus-article-sort-by-%s" predicate)))
12029          (gnus-thread-sort-functions
12030           (if (not reverse)
12031               thread
12032             `(lambda (t1 t2)
12033                (,thread t2 t1))))
12034          (gnus-sort-gathered-threads-function
12035           gnus-thread-sort-functions)
12036          (gnus-article-sort-functions
12037           (if (not reverse)
12038               article
12039             `(lambda (t1 t2)
12040                (,article t2 t1))))
12041          (inhibit-read-only t)
12042          (gnus-summary-prepare-hook nil))
12043     ;; We do the sorting by regenerating the threads.
12044     (gnus-summary-prepare)
12045     ;; Hide subthreads if needed.
12046     (gnus-summary-maybe-hide-threads)))
12047
12048 ;; Summary saving commands.
12049
12050 (defun gnus-summary-save-article (&optional n not-saved)
12051   "Save the current article using the default saver function.
12052 If N is a positive number, save the N next articles.
12053 If N is a negative number, save the N previous articles.
12054 If N is nil and any articles have been marked with the process mark,
12055 save those articles instead.
12056 The variable `gnus-default-article-saver' specifies the saver function.
12057
12058 If the optional second argument NOT-SAVED is non-nil, articles saved
12059 will not be marked as saved."
12060   (interactive "P")
12061   (require 'gnus-art)
12062   (let* ((articles (gnus-summary-work-articles n))
12063          (save-buffer (save-excursion
12064                         (nnheader-set-temp-buffer " *Gnus Save*")))
12065          (num (length articles))
12066          ;; Whether to save decoded articles or raw articles.
12067          (decode (when gnus-article-save-coding-system
12068                    (get gnus-default-article-saver :decode)))
12069          ;; When saving many articles in a single file, use the other
12070          ;; function to save articles other than the first one.
12071          (saver2 (get gnus-default-article-saver :function))
12072          (gnus-prompt-before-saving (if saver2
12073                                         t
12074                                       gnus-prompt-before-saving))
12075          (gnus-default-article-saver gnus-default-article-saver)
12076          header file)
12077     (dolist (article articles)
12078       (setq header (gnus-summary-article-header article))
12079       (if (not (vectorp header))
12080           ;; This is a pseudo-article.
12081           (if (assq 'name header)
12082               (gnus-copy-file (cdr (assq 'name header)))
12083             (gnus-message 1 "Article %d is unsavable" article))
12084         ;; This is a real article.
12085         (save-window-excursion
12086           (gnus-summary-select-article decode decode nil article)
12087           (gnus-summary-goto-subject article))
12088         (with-current-buffer save-buffer
12089           (erase-buffer)
12090           (insert-buffer-substring (if decode
12091                                        gnus-article-buffer
12092                                      gnus-original-article-buffer)))
12093         (setq file (gnus-article-save save-buffer file num))
12094         (gnus-summary-remove-process-mark article)
12095         (unless not-saved
12096           (gnus-summary-set-saved-mark article)))
12097       (when saver2
12098         (setq gnus-default-article-saver saver2
12099               saver2 nil)))
12100     (gnus-kill-buffer save-buffer)
12101     (gnus-summary-position-point)
12102     (gnus-set-mode-line 'summary)
12103     n))
12104
12105 (declare-function gnus-summary-save-in-pipe "gnus-art" (&optional command raw))
12106
12107 (defun gnus-summary-pipe-output (&optional n sym)
12108   "Pipe the current article to a subprocess.
12109 If N is a positive number, pipe the N next articles.
12110 If N is a negative number, pipe the N previous articles.
12111 If N is nil and any articles have been marked with the process mark,
12112 pipe those articles instead.
12113 The default command to which articles are piped is specified by the
12114 variable `gnus-summary-pipe-output-default-command'; if it is nil, you
12115 will be prompted for the command.
12116
12117 The properties `:decode' and `:headers' that are put to the function
12118 symbol `gnus-summary-save-in-pipe' control whether this function
12119 decodes articles and what headers to keep (see the doc string for the
12120 `gnus-default-article-saver' variable).  If SYM (the symbolic prefix)
12121 is neither omitted nor the symbol `r', force including all headers
12122 regardless of the `:headers' property.  If it is the symbol `r',
12123 articles that are not decoded and include all headers will be piped
12124 no matter what the properties `:decode' and `:headers' are."
12125   (interactive (gnus-interactive "P\ny"))
12126   (require 'gnus-art)
12127   (let* ((articles (gnus-summary-work-articles n))
12128          (result-buffer "*Shell Command Output*")
12129          (all-headers (not (memq sym '(nil r))))
12130          (gnus-save-all-headers (or all-headers gnus-save-all-headers))
12131          (raw (eq sym 'r))
12132          (headers (get 'gnus-summary-save-in-pipe :headers))
12133          command result)
12134     (unless (numberp (car articles))
12135       (error "No article to pipe"))
12136     (setq command (gnus-read-shell-command
12137                    (concat "Shell command on "
12138                            (if (cdr articles)
12139                                (format "these %d articles" (length articles))
12140                              "this article")
12141                            ": ")
12142                    gnus-summary-pipe-output-default-command))
12143     (when (string-equal command "")
12144       (error "A command is required"))
12145     (when all-headers
12146       (put 'gnus-summary-save-in-pipe :headers nil))
12147     (unwind-protect
12148         (while articles
12149           (gnus-summary-goto-subject (pop articles))
12150           (save-window-excursion (gnus-summary-save-in-pipe command raw))
12151           (when (and (get-buffer result-buffer)
12152                      (not (zerop (buffer-size (get-buffer result-buffer)))))
12153             (setq result (concat result (with-current-buffer result-buffer
12154                                           (buffer-string))))))
12155       (put 'gnus-summary-save-in-pipe :headers headers))
12156     (unless (zerop (length result))
12157       (if (with-current-buffer (get-buffer-create result-buffer)
12158             (erase-buffer)
12159             (insert result)
12160             (prog1
12161                 (and (= (count-lines (point-min) (point)) 1)
12162                      (progn
12163                        (end-of-line 0)
12164                        (<= (current-column)
12165                            (window-width (minibuffer-window)))))
12166               (goto-char (point-min))))
12167           (message "%s" (substring result 0 -1))
12168         (message nil)
12169         (gnus-configure-windows 'pipe)))))
12170
12171 (defun gnus-summary-save-article-mail (&optional arg)
12172   "Append the current article to a Unix mail box file.
12173 If N is a positive number, save the N next articles.
12174 If N is a negative number, save the N previous articles.
12175 If N is nil and any articles have been marked with the process mark,
12176 save those articles instead."
12177   (interactive "P")
12178   (require 'gnus-art)
12179   (let ((gnus-default-article-saver 'gnus-summary-save-in-mail))
12180     (gnus-summary-save-article arg)))
12181
12182 (defun gnus-summary-save-article-rmail (&optional arg)
12183   "Append the current article to an rmail file.
12184 If N is a positive number, save the N next articles.
12185 If N is a negative number, save the N previous articles.
12186 If N is nil and any articles have been marked with the process mark,
12187 save those articles instead."
12188   (interactive "P")
12189   (require 'gnus-art)
12190   (let ((gnus-default-article-saver 'gnus-summary-save-in-rmail))
12191     (gnus-summary-save-article arg)))
12192
12193 (defun gnus-summary-save-article-file (&optional arg)
12194   "Append the current article to a file.
12195 If N is a positive number, save the N next articles.
12196 If N is a negative number, save the N previous articles.
12197 If N is nil and any articles have been marked with the process mark,
12198 save those articles instead."
12199   (interactive "P")
12200   (require 'gnus-art)
12201   (let ((gnus-default-article-saver 'gnus-summary-save-in-file))
12202     (gnus-summary-save-article arg)))
12203
12204 (defun gnus-summary-write-article-file (&optional arg)
12205   "Write the current article to a file, deleting the previous file.
12206 If N is a positive number, save the N next articles.
12207 If N is a negative number, save the N previous articles.
12208 If N is nil and any articles have been marked with the process mark,
12209 save those articles instead."
12210   (interactive "P")
12211   (require 'gnus-art)
12212   (let ((gnus-default-article-saver 'gnus-summary-write-to-file))
12213     (gnus-summary-save-article arg)))
12214
12215 (defun gnus-summary-save-article-body-file (&optional arg)
12216   "Append the current article body to a file.
12217 If N is a positive number, save the N next articles.
12218 If N is a negative number, save the N previous articles.
12219 If N is nil and any articles have been marked with the process mark,
12220 save those articles instead."
12221   (interactive "P")
12222   (require 'gnus-art)
12223   (let ((gnus-default-article-saver 'gnus-summary-save-body-in-file))
12224     (gnus-summary-save-article arg)))
12225
12226 (defun gnus-summary-write-article-body-file (&optional arg)
12227   "Write the current article body to a file, deleting the previous file.
12228 If N is a positive number, save the N next articles.
12229 If N is a negative number, save the N previous articles.
12230 If N is nil and any articles have been marked with the process mark,
12231 save those articles instead."
12232   (interactive "P")
12233   (require 'gnus-art)
12234   (let ((gnus-default-article-saver 'gnus-summary-write-body-to-file))
12235     (gnus-summary-save-article arg)))
12236
12237 (defun gnus-summary-muttprint (&optional arg)
12238   "Print the current article using Muttprint.
12239 If N is a positive number, save the N next articles.
12240 If N is a negative number, save the N previous articles.
12241 If N is nil and any articles have been marked with the process mark,
12242 save those articles instead."
12243   (interactive "P")
12244   (require 'gnus-art)
12245   (let ((gnus-default-article-saver 'gnus-summary-pipe-to-muttprint))
12246     (gnus-summary-save-article arg t)))
12247
12248 (defun gnus-summary-pipe-message (program)
12249   "Pipe the current article through PROGRAM."
12250   (interactive "sProgram: ")
12251   (gnus-summary-select-article)
12252   (let ((mail-header-separator ""))
12253     (gnus-eval-in-buffer-window gnus-article-buffer
12254       (save-restriction
12255         (widen)
12256         (let ((start (window-start))
12257               (inhibit-read-only t))
12258           (message-pipe-buffer-body program)
12259           (set-window-start (get-buffer-window (current-buffer)) start))))))
12260
12261 (defun gnus-get-split-value (methods)
12262   "Return a value based on the split METHODS."
12263   (let (split-name method result match)
12264     (when methods
12265       (with-current-buffer gnus-original-article-buffer
12266         (save-restriction
12267           (nnheader-narrow-to-headers)
12268           (while (and methods (not split-name))
12269             (goto-char (point-min))
12270             (setq method (pop methods))
12271             (setq match (car method))
12272             (when (cond
12273                    ((stringp match)
12274                     ;; Regular expression.
12275                     (ignore-errors
12276                       (re-search-forward match nil t)))
12277                    ((functionp match)
12278                     ;; Function.
12279                     (save-restriction
12280                       (widen)
12281                       (setq result (funcall match gnus-newsgroup-name))))
12282                    ((consp match)
12283                     ;; Form.
12284                     (save-restriction
12285                       (widen)
12286                       (setq result (eval match)))))
12287               (setq split-name (cdr method))
12288               (cond ((stringp result)
12289                      (push (expand-file-name
12290                             result gnus-article-save-directory)
12291                            split-name))
12292                     ((consp result)
12293                      (setq split-name (append result split-name)))))))))
12294     (nreverse split-name)))
12295
12296 (defun gnus-valid-move-group-p (group)
12297   (and (symbolp group)
12298        (boundp group)
12299        (symbol-name group)
12300        (symbol-value group)
12301        (gnus-get-function (gnus-find-method-for-group
12302                            (symbol-name group)) 'request-accept-article t)))
12303
12304 (defun gnus-read-move-group-name (prompt default articles prefix)
12305   "Read a group name."
12306   (let* ((split-name (gnus-get-split-value gnus-move-split-methods))
12307          (minibuffer-confirm-incomplete nil) ; XEmacs
12308          (prom
12309           (format "%s %s to"
12310                   prompt
12311                   (if (> (length articles) 1)
12312                       (format "these %d articles" (length articles))
12313                     "this article")))
12314          (to-newsgroup
12315           (cond
12316            ((null split-name)
12317             (gnus-group-completing-read
12318              prom
12319              (gnus-remove-if-not 'gnus-valid-move-group-p gnus-active-hashtb t)
12320              nil prefix nil default))
12321            ((= 1 (length split-name))
12322             (gnus-group-completing-read
12323              prom
12324              (gnus-remove-if-not 'gnus-valid-move-group-p gnus-active-hashtb t)
12325              nil prefix 'gnus-group-history (car split-name)))
12326            (t
12327             (gnus-completing-read
12328              prom (nreverse split-name) nil nil 'gnus-group-history))))
12329          (to-method (gnus-server-to-method (gnus-group-method to-newsgroup)))
12330          encoded)
12331     (when to-newsgroup
12332       (if (or (string= to-newsgroup "")
12333               (string= to-newsgroup prefix))
12334           (setq to-newsgroup default))
12335       (unless to-newsgroup
12336         (error "No group name entered"))
12337       (setq encoded (mm-encode-coding-string
12338                      to-newsgroup
12339                      (gnus-group-name-charset to-method to-newsgroup)))
12340       (or (gnus-active encoded)
12341           (gnus-activate-group encoded nil nil to-method)
12342           (if (gnus-y-or-n-p (format "No such group: %s.  Create it? "
12343                                      to-newsgroup))
12344               (or (and (gnus-request-create-group encoded to-method)
12345                        (gnus-activate-group encoded nil nil to-method)
12346                        (gnus-subscribe-group encoded))
12347                   (error "Couldn't create group %s" to-newsgroup)))
12348           (error "No such group: %s" to-newsgroup))
12349       encoded)))
12350
12351 (defvar gnus-summary-save-parts-counter)
12352 (declare-function mm-uu-dissect "mm-uu" (&optional noheader mime-type))
12353
12354 (defun gnus-summary-save-parts (type dir n &optional reverse)
12355   "Save parts matching TYPE to DIR.
12356 If REVERSE, save parts that do not match TYPE."
12357   (interactive
12358    (list (read-string "Save parts of type: "
12359                       (or (car gnus-summary-save-parts-type-history)
12360                           gnus-summary-save-parts-default-mime)
12361                       'gnus-summary-save-parts-type-history)
12362          (setq gnus-summary-save-parts-last-directory
12363                (read-directory-name "Save to directory: "
12364                                     gnus-summary-save-parts-last-directory
12365                                     nil t))
12366          current-prefix-arg))
12367   (gnus-summary-iterate n
12368     (let ((gnus-display-mime-function nil)
12369           gnus-article-prepare-hook
12370           gnus-article-decode-hook
12371           gnus-display-mime-function
12372           gnus-break-pages
12373           (gnus-inhibit-treatment t))
12374       (gnus-summary-select-article))
12375     (with-current-buffer gnus-article-buffer
12376       (let ((handles (or gnus-article-mime-handles
12377                          (mm-dissect-buffer nil gnus-article-loose-mime)
12378                          (and gnus-article-emulate-mime
12379                               (mm-uu-dissect))))
12380             (gnus-summary-save-parts-counter 1))
12381         (when handles
12382           (gnus-summary-save-parts-1 type dir handles reverse)
12383           (unless gnus-article-mime-handles ;; Don't destroy this case.
12384             (mm-destroy-parts handles)))))))
12385
12386 (defun gnus-summary-save-parts-1 (type dir handle reverse)
12387   (if (stringp (car handle))
12388       (mapcar (lambda (h) (gnus-summary-save-parts-1 type dir h reverse))
12389               (cdr handle))
12390     (when (if reverse
12391               (not (string-match type (mm-handle-media-type handle)))
12392             (string-match type (mm-handle-media-type handle)))
12393       (let ((file (expand-file-name
12394                    (gnus-map-function
12395                     mm-file-name-rewrite-functions
12396                     (file-name-nondirectory
12397                      (or
12398                       (mm-handle-filename handle)
12399                       (format "%s.%d.%d" gnus-newsgroup-name
12400                               (cdr gnus-article-current)
12401                               gnus-summary-save-parts-counter))))
12402                    dir)))
12403         (incf gnus-summary-save-parts-counter)
12404         (unless (file-exists-p file)
12405           (mm-save-part-to-file handle file))))))
12406
12407 ;; Summary extract commands
12408
12409 (defun gnus-summary-insert-pseudos (pslist &optional not-view)
12410   (let ((inhibit-read-only t)
12411         (article (gnus-summary-article-number))
12412         after-article b e)
12413     (unless (gnus-summary-goto-subject article)
12414       (error "No such article: %d" article))
12415     (gnus-summary-position-point)
12416     ;; If all commands are to be bunched up on one line, we collect
12417     ;; them here.
12418     (unless gnus-view-pseudos-separately
12419       (let ((ps (setq pslist (sort pslist 'gnus-pseudos<)))
12420             files action)
12421         (while ps
12422           (setq action (cdr (assq 'action (car ps))))
12423           (setq files (list (cdr (assq 'name (car ps)))))
12424           (while (and ps (cdr ps)
12425                       (string= (or action "1")
12426                                (or (cdr (assq 'action (cadr ps))) "2")))
12427             (push (cdr (assq 'name (cadr ps))) files)
12428             (setcdr ps (cddr ps)))
12429           (when files
12430             (when (not (string-match "%s" action))
12431               (push " " files))
12432             (push " " files)
12433             (when (assq 'execute (car ps))
12434               (setcdr (assq 'execute (car ps))
12435                       (funcall (if (string-match "%s" action)
12436                                    'format 'concat)
12437                                action
12438                                (mapconcat
12439                                 (lambda (f)
12440                                   (if (equal f " ")
12441                                       f
12442                                     (shell-quote-argument f)))
12443                                 files " ")))))
12444           (setq ps (cdr ps)))))
12445     (if (and gnus-view-pseudos (not not-view))
12446         (while pslist
12447           (when (assq 'execute (car pslist))
12448             (gnus-execute-command (cdr (assq 'execute (car pslist)))
12449                                   (eq gnus-view-pseudos 'not-confirm)))
12450           (setq pslist (cdr pslist)))
12451       (save-excursion
12452         (while pslist
12453           (setq after-article (or (cdr (assq 'article (car pslist)))
12454                                   (gnus-summary-article-number)))
12455           (gnus-summary-goto-subject after-article)
12456           (forward-line 1)
12457           (setq b (point))
12458           (insert "    " (file-name-nondirectory
12459                           (cdr (assq 'name (car pslist))))
12460                   ": " (or (cdr (assq 'execute (car pslist))) "") "\n")
12461           (setq e (point))
12462           (forward-line -1)             ; back to `b'
12463           (gnus-add-text-properties
12464            b (1- e) (list 'gnus-number gnus-reffed-article-number
12465                           gnus-mouse-face-prop gnus-mouse-face))
12466           (gnus-data-enter
12467            after-article gnus-reffed-article-number
12468            gnus-unread-mark b (car pslist) 0 (- e b))
12469           (setq gnus-newsgroup-unreads
12470                 (gnus-add-to-sorted-list gnus-newsgroup-unreads
12471                                          gnus-reffed-article-number))
12472           (setq gnus-reffed-article-number (1- gnus-reffed-article-number))
12473           (setq pslist (cdr pslist)))))))
12474
12475 (defun gnus-pseudos< (p1 p2)
12476   (let ((c1 (cdr (assq 'action p1)))
12477         (c2 (cdr (assq 'action p2))))
12478     (and c1 c2 (string< c1 c2))))
12479
12480 (defun gnus-request-pseudo-article (props)
12481   (cond ((assq 'execute props)
12482          (gnus-execute-command (cdr (assq 'execute props)))))
12483   (let ((gnus-current-article (gnus-summary-article-number)))
12484     (gnus-run-hooks 'gnus-mark-article-hook)))
12485
12486 (defun gnus-execute-command (command &optional automatic)
12487   (save-excursion
12488     (gnus-article-setup-buffer)
12489     (set-buffer gnus-article-buffer)
12490     (setq buffer-read-only nil)
12491     (let ((command (if automatic command
12492                      (read-string "Command: " (cons command 0)))))
12493       (erase-buffer)
12494       (insert "$ " command "\n\n")
12495       (if gnus-view-pseudo-asynchronously
12496           (start-process "gnus-execute" (current-buffer) shell-file-name
12497                          shell-command-switch command)
12498         (call-process shell-file-name nil t nil
12499                       shell-command-switch command)))))
12500
12501 ;; Summary kill commands.
12502
12503 (defun gnus-summary-edit-global-kill (article)
12504   "Edit the \"global\" kill file."
12505   (interactive (list (gnus-summary-article-number)))
12506   (gnus-group-edit-global-kill article))
12507
12508 (defun gnus-summary-edit-local-kill ()
12509   "Edit a local kill file applied to the current newsgroup."
12510   (interactive)
12511   (setq gnus-current-headers (gnus-summary-article-header))
12512   (gnus-group-edit-local-kill
12513    (gnus-summary-article-number) gnus-newsgroup-name))
12514
12515 ;;; Header reading.
12516
12517 (defun gnus-read-header (id &optional header)
12518   "Read the headers of article ID and enter them into the Gnus system."
12519   (let ((group gnus-newsgroup-name)
12520         (gnus-override-method
12521          (or
12522           gnus-override-method
12523           (and (gnus-news-group-p gnus-newsgroup-name)
12524                (car (gnus-refer-article-methods)))))
12525         where)
12526     ;; First we check to see whether the header in question is already
12527     ;; fetched.
12528     (if (stringp id)
12529         ;; This is a Message-ID.
12530         (setq header (or header (gnus-id-to-header id)))
12531       ;; This is an article number.
12532       (setq header (or header (gnus-summary-article-header id))))
12533     (if (and header
12534              (not (gnus-summary-article-sparse-p (mail-header-number header))))
12535         ;; We have found the header.
12536         header
12537       ;; We have to really fetch the header to this article.
12538       (with-current-buffer nntp-server-buffer
12539         (when (setq where (gnus-request-head id group))
12540           (nnheader-fold-continuation-lines)
12541           (goto-char (point-max))
12542           (insert ".\n")
12543           (goto-char (point-min))
12544           (insert "211 ")
12545           (princ (cond
12546                   ((numberp id) id)
12547                   ((cdr where) (cdr where))
12548                   (header (mail-header-number header))
12549                   (t gnus-reffed-article-number))
12550                  (current-buffer))
12551           (insert " Article retrieved.\n"))
12552         (if (or (not where)
12553                 (not (setq header (car (gnus-get-newsgroup-headers nil t)))))
12554             ()                          ; Malformed head.
12555           (unless (gnus-summary-article-sparse-p (mail-header-number header))
12556             (when (and (bound-and-true-p gnus-registry-enabled)
12557                        (not (gnus-ephemeral-group-p (car where))))
12558               (gnus-registry-handle-action
12559                (mail-header-id header) nil
12560                (gnus-group-prefixed-name
12561                 (car where)
12562                 (or gnus-override-method (gnus-find-method-for-group group)))
12563                (mail-header-subject header)
12564                (mail-header-from header)))
12565             (when (and (stringp id)
12566                        (or
12567                         (not (string= (gnus-group-real-name group)
12568                                       (car where)))
12569                         (not (gnus-server-equal gnus-override-method
12570                                                 (gnus-group-method group)))))
12571               ;; If we fetched by Message-ID and the article came from
12572               ;; a different group (or server), we fudge some bogus
12573               ;; article numbers for this article.
12574               (mail-header-set-number header gnus-reffed-article-number))
12575             (with-current-buffer gnus-summary-buffer
12576               (decf gnus-reffed-article-number)
12577               (gnus-remove-header (mail-header-number header))
12578               (push header gnus-newsgroup-headers)
12579               (setq gnus-current-headers header)
12580               (push (mail-header-number header) gnus-newsgroup-limit)))
12581           header)))))
12582
12583 (defun gnus-remove-header (number)
12584   "Remove header NUMBER from `gnus-newsgroup-headers'."
12585   (if (and gnus-newsgroup-headers
12586            (= number (mail-header-number (car gnus-newsgroup-headers))))
12587       (pop gnus-newsgroup-headers)
12588     (let ((headers gnus-newsgroup-headers))
12589       (while (and (cdr headers)
12590                   (not (= number (mail-header-number (cadr headers)))))
12591         (pop headers))
12592       (when (cdr headers)
12593         (setcdr headers (cddr headers))))))
12594
12595 ;;;
12596 ;;; summary highlights
12597 ;;;
12598
12599 (defun gnus-highlight-selected-summary ()
12600   "Highlight selected article in summary buffer."
12601   ;; Added by Per Abrahamsen <amanda@iesd.auc.dk>.
12602   (when gnus-summary-selected-face
12603     (save-excursion
12604       (let* ((beg (point-at-bol))
12605              (end (point-at-eol))
12606              ;; Fix by Mike Dugan <dugan@bucrf16.bu.edu>.
12607              (from (if (get-text-property beg gnus-mouse-face-prop)
12608                        beg
12609                      (or (next-single-property-change
12610                           beg gnus-mouse-face-prop nil end)
12611                          beg)))
12612              (to
12613               (if (= from end)
12614                   (- from 2)
12615                 (or (next-single-property-change
12616                      from gnus-mouse-face-prop nil end)
12617                     end))))
12618         ;; If no mouse-face prop on line we will have to = from = end,
12619         ;; so we highlight the entire line instead.
12620         (when (= (+ to 2) from)
12621           (setq from beg)
12622           (setq to end))
12623         (if gnus-newsgroup-selected-overlay
12624             ;; Move old overlay.
12625             (gnus-move-overlay
12626              gnus-newsgroup-selected-overlay from to (current-buffer))
12627           ;; Create new overlay.
12628           (gnus-overlay-put
12629            (setq gnus-newsgroup-selected-overlay (gnus-make-overlay from to))
12630            'face gnus-summary-selected-face))))))
12631
12632 (defvar gnus-summary-highlight-line-cached nil)
12633 (defvar gnus-summary-highlight-line-trigger nil)
12634
12635 (defun gnus-summary-highlight-line-0 ()
12636   (if (and (eq gnus-summary-highlight-line-trigger
12637                gnus-summary-highlight)
12638            gnus-summary-highlight-line-cached)
12639       gnus-summary-highlight-line-cached
12640     (setq gnus-summary-highlight-line-trigger gnus-summary-highlight
12641           gnus-summary-highlight-line-cached
12642           (let* ((cond (list 'cond))
12643                  (c cond)
12644                  (list gnus-summary-highlight))
12645             (while list
12646               (setcdr c (cons (list (caar list) (list 'quote (cdar list)))
12647                               nil))
12648               (setq c (cdr c)
12649                     list (cdr list)))
12650             (gnus-byte-compile (list 'lambda nil cond))))))
12651
12652 (defun gnus-summary-highlight-line ()
12653   "Highlight current line according to `gnus-summary-highlight'."
12654   (let* ((beg (point-at-bol))
12655          (article (or (gnus-summary-article-number) gnus-current-article))
12656          (score (or (cdr (assq article
12657                                gnus-newsgroup-scored))
12658                     gnus-summary-default-score 0))
12659          (mark (or (gnus-summary-article-mark) gnus-unread-mark))
12660          (inhibit-read-only t)
12661          (default gnus-summary-default-score)
12662          (default-high gnus-summary-default-high-score)
12663          (default-low gnus-summary-default-low-score)
12664          (uncached (and gnus-summary-use-undownloaded-faces
12665                         (memq article gnus-newsgroup-undownloaded)
12666                         (not (memq article gnus-newsgroup-cached)))))
12667     (let ((face (funcall (gnus-summary-highlight-line-0))))
12668       (unless (eq face (gnus-get-text-property-excluding-characters-with-faces beg 'face))
12669         (gnus-put-text-property-excluding-characters-with-faces
12670          beg (point-at-eol) 'face
12671          (setq face (if (boundp face) (symbol-value face) face)))
12672         (when gnus-summary-highlight-line-function
12673           (funcall gnus-summary-highlight-line-function article face))))))
12674
12675 (defun gnus-update-read-articles (group unread &optional compute)
12676   "Update the list of read articles in GROUP.
12677 UNREAD is a sorted list."
12678   (let ((active (or gnus-newsgroup-active (gnus-active group)))
12679         (info (gnus-get-info group))
12680         (prev 1)
12681         read)
12682     (if (or (not info) (not active))
12683         ;; There is no info on this group if it was, in fact,
12684         ;; killed.  Gnus stores no information on killed groups, so
12685         ;; there's nothing to be done.
12686         ;; One could store the information somewhere temporarily,
12687         ;; perhaps...  Hmmm...
12688         ()
12689       ;; Remove any negative articles numbers.
12690       (while (and unread (< (car unread) 0))
12691         (setq unread (cdr unread)))
12692       ;; Remove any expired article numbers
12693       (while (and unread (< (car unread) (car active)))
12694         (setq unread (cdr unread)))
12695       ;; Compute the ranges of read articles by looking at the list of
12696       ;; unread articles.
12697       (while unread
12698         (when (/= (car unread) prev)
12699           (push (if (= prev (1- (car unread))) prev
12700                   (cons prev (1- (car unread))))
12701                 read))
12702         (setq prev (1+ (car unread)))
12703         (setq unread (cdr unread)))
12704       (when (<= prev (cdr active))
12705         (push (cons prev (cdr active)) read))
12706       (setq read (if (> (length read) 1) (nreverse read) read))
12707       (if compute
12708           read
12709         (save-excursion
12710           (let (setmarkundo)
12711             ;; Propagate the read marks to the backend.
12712             (when (and (gnus-method-option-p
12713                         (gnus-find-method-for-group group)
12714                         'server-marks)
12715                        (gnus-check-backend-function 'request-set-mark group))
12716               (let ((del (gnus-remove-from-range (gnus-info-read info) read))
12717                     (add (gnus-remove-from-range read (gnus-info-read info))))
12718                 (when (or add del)
12719                   (unless (gnus-check-group group)
12720                     (error "Can't open server for %s" group))
12721                   (gnus-request-set-mark
12722                    group (delq nil (list (if add (list add 'add '(read)))
12723                                          (if del (list del 'del '(read))))))
12724                   (setq setmarkundo
12725                         `(gnus-request-set-mark
12726                           ,group
12727                           ',(delq nil (list
12728                                        (if del (list del 'add '(read)))
12729                                        (if add (list add 'del '(read))))))))))
12730             (set-buffer gnus-group-buffer)
12731             (gnus-undo-register
12732               `(progn
12733                  (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
12734                  (gnus-info-set-read ',info ',(gnus-info-read info))
12735                  (gnus-get-unread-articles-in-group ',info
12736                                                     (gnus-active ,group))
12737                  (gnus-group-update-group ,group t)
12738                  ,setmarkundo))))
12739         ;; Enter this list into the group info.
12740         (gnus-info-set-read info read)
12741         ;; Set the number of unread articles in gnus-newsrc-hashtb.
12742         (gnus-get-unread-articles-in-group info (gnus-active group))
12743         t))))
12744
12745 (defun gnus-offer-save-summaries ()
12746   "Offer to save all active summary buffers."
12747   (let (buffers)
12748     ;; Go through all buffers and find all summaries.
12749     (dolist (buffer (buffer-list))
12750       (when (and (setq buffer (buffer-name buffer))
12751                  (string-match "Summary" buffer)
12752                  (with-current-buffer buffer
12753                    ;; We check that this is, indeed, a summary buffer.
12754                    (and (derived-mode-p 'gnus-summary-mode)
12755                         ;; Also make sure this isn't bogus.
12756                         gnus-newsgroup-prepared
12757                         ;; Also make sure that this isn't a
12758                         ;; dead summary buffer.
12759                         (not gnus-dead-summary-mode))))
12760         (push buffer buffers)))
12761     ;; Go through all these summary buffers and offer to save them.
12762     (when buffers
12763       (save-excursion
12764         (if (eq gnus-interactive-exit 'quiet)
12765             (dolist (buffer buffers)
12766               (switch-to-buffer buffer)
12767               (gnus-summary-exit))
12768           (map-y-or-n-p
12769            "Update summary buffer %s? "
12770            (lambda (buf)
12771              (switch-to-buffer buf)
12772              (gnus-summary-exit))
12773            buffers))))))
12774
12775 (defun gnus-summary-setup-default-charset ()
12776   "Setup newsgroup default charset."
12777   (if (member gnus-newsgroup-name '("nndraft:delayed" "nndraft:drafts"))
12778       (setq gnus-newsgroup-charset nil)
12779     (let* ((ignored-charsets
12780             (or gnus-newsgroup-ephemeral-ignored-charsets
12781                 (append
12782                  (and gnus-newsgroup-name
12783                       (gnus-parameter-ignored-charsets gnus-newsgroup-name))
12784                  gnus-newsgroup-ignored-charsets))))
12785       (setq gnus-newsgroup-charset
12786             (or gnus-newsgroup-ephemeral-charset
12787                 (and gnus-newsgroup-name
12788                      (gnus-parameter-charset gnus-newsgroup-name))
12789                 gnus-default-charset))
12790       (set (make-local-variable 'gnus-newsgroup-ignored-charsets)
12791            ignored-charsets))))
12792
12793 ;;;
12794 ;;; Mime Commands
12795 ;;;
12796
12797 (defun gnus-summary-display-buttonized (&optional show-all-parts)
12798   "Display the current article buffer fully MIME-buttonized.
12799 If SHOW-ALL-PARTS (the prefix) is non-nil, all multipart/* parts are
12800 treated as multipart/mixed."
12801   (interactive "P")
12802   (require 'gnus-art)
12803   (let ((gnus-unbuttonized-mime-types nil)
12804         (gnus-mime-display-multipart-as-mixed show-all-parts))
12805     (gnus-summary-show-article)))
12806
12807 (defun gnus-summary-repair-multipart (article)
12808   "Add a Content-Type header to a multipart article without one."
12809   (interactive (list (gnus-summary-article-number)))
12810   (gnus-with-article article
12811     (message-narrow-to-head)
12812     (message-remove-header "Mime-Version")
12813     (goto-char (point-max))
12814     (insert "Mime-Version: 1.0\n")
12815     (widen)
12816     (when (search-forward "\n--" nil t)
12817       (let ((separator (buffer-substring (point) (point-at-eol))))
12818         (message-narrow-to-head)
12819         (message-remove-header "Content-Type")
12820         (goto-char (point-max))
12821         (insert (format "Content-Type: multipart/mixed; boundary=\"%s\"\n"
12822                         separator))
12823         (widen))))
12824   (let (gnus-mark-article-hook)
12825     (gnus-summary-select-article t t nil article)))
12826
12827 (defun gnus-summary-toggle-display-buttonized ()
12828   "Toggle the buttonizing of the article buffer."
12829   (interactive)
12830   (require 'gnus-art)
12831   (if (setq gnus-inhibit-mime-unbuttonizing
12832             (not gnus-inhibit-mime-unbuttonizing))
12833       (let ((gnus-unbuttonized-mime-types nil))
12834         (gnus-summary-show-article))
12835     (gnus-summary-show-article)))
12836
12837 ;;;
12838 ;;; Generic summary marking commands
12839 ;;;
12840
12841 (defvar gnus-summary-marking-alist
12842   '((read gnus-del-mark "d")
12843     (unread gnus-unread-mark "u")
12844     (ticked gnus-ticked-mark "!")
12845     (dormant gnus-dormant-mark "?")
12846     (expirable gnus-expirable-mark "e"))
12847   "An alist of names/marks/keystrokes.")
12848
12849 (defvar gnus-summary-generic-mark-map (make-sparse-keymap))
12850 (defvar gnus-summary-mark-map)
12851
12852 (defun gnus-summary-make-all-marking-commands ()
12853   (define-key gnus-summary-mark-map "M" gnus-summary-generic-mark-map)
12854   (dolist (elem gnus-summary-marking-alist)
12855     (apply 'gnus-summary-make-marking-command elem)))
12856
12857 (defun gnus-summary-make-marking-command (name mark keystroke)
12858   (let ((map (make-sparse-keymap)))
12859     (define-key gnus-summary-generic-mark-map keystroke map)
12860     (dolist (lway `((next "next" next nil "n")
12861                     (next-unread "next unread" next t "N")
12862                     (prev "previous" prev nil "p")
12863                     (prev-unread "previous unread" prev t "P")
12864                     (nomove "" nil nil ,keystroke)))
12865       (let ((func (gnus-summary-make-marking-command-1
12866                    mark (car lway) lway name)))
12867         (setq func (eval func))
12868         (define-key map (nth 4 lway) func)))))
12869
12870 (defun gnus-summary-make-marking-command-1 (mark way lway name)
12871   `(defun ,(intern
12872             (format "gnus-summary-put-mark-as-%s%s"
12873                     name (if (eq way 'nomove)
12874                              ""
12875                            (concat "-" (symbol-name way)))))
12876      (n)
12877      ,(format
12878        "Mark the current article as %s%s.
12879 If N, the prefix, then repeat N times.
12880 If N is negative, move in reverse order.
12881 The difference between N and the actual number of articles marked is
12882 returned."
12883        name (cadr lway))
12884      (interactive "p")
12885      (gnus-summary-generic-mark n ,mark ',(nth 2 lway) ,(nth 3 lway))))
12886
12887 (defun gnus-summary-generic-mark (n mark move unread)
12888   "Mark N articles with MARK."
12889   (unless (derived-mode-p 'gnus-summary-mode)
12890     (error "This command can only be used in the summary buffer"))
12891   (gnus-summary-show-thread)
12892   (let ((nummove
12893          (cond
12894           ((eq move 'next) 1)
12895           ((eq move 'prev) -1)
12896           (t 0))))
12897     (if (zerop nummove)
12898         (setq n 1)
12899       (when (< n 0)
12900         (setq n (abs n)
12901               nummove (* -1 nummove))))
12902     (while (and (> n 0)
12903                 (gnus-summary-mark-article nil mark)
12904                 (zerop (gnus-summary-next-subject nummove unread t)))
12905       (setq n (1- n)))
12906     (when (/= 0 n)
12907       (gnus-message 7 "No more %sarticles" (if mark "" "unread ")))
12908     (gnus-summary-recenter)
12909     (gnus-summary-position-point)
12910     (gnus-set-mode-line 'summary)
12911     n))
12912
12913 (defun gnus-summary-insert-articles (articles)
12914   (when (setq articles
12915               (gnus-sorted-difference articles
12916                                       (mapcar (lambda (h)
12917                                                 (mail-header-number h))
12918                                               gnus-newsgroup-headers)))
12919     (setq gnus-newsgroup-headers
12920           (gnus-merge 'list
12921                       gnus-newsgroup-headers
12922                       (gnus-fetch-headers articles nil t)
12923                       'gnus-article-sort-by-number))
12924     (setq gnus-newsgroup-articles
12925           (gnus-sorted-nunion gnus-newsgroup-articles articles))
12926     ;; Suppress duplicates?
12927     (when gnus-suppress-duplicates
12928       (gnus-dup-suppress-articles))
12929
12930     (if (and gnus-fetch-old-headers
12931              (eq gnus-headers-retrieved-by 'nov))
12932         ;; We might want to build some more threads first.
12933         (if (eq gnus-fetch-old-headers 'invisible)
12934             (gnus-build-all-threads)
12935           (gnus-build-old-threads))
12936       ;; Mark the inserted articles that are unread as unread.
12937       (setq gnus-newsgroup-unreads
12938             (gnus-sorted-nunion
12939              gnus-newsgroup-unreads
12940              (gnus-sorted-nintersection
12941               (gnus-list-of-unread-articles gnus-newsgroup-name)
12942               articles)))
12943       ;; Mark the inserted articles as selected so that the information
12944       ;; of the marks having been changed by a user may be updated when
12945       ;; exiting this group.  See `gnus-summary-update-info'.
12946       (dolist (art articles)
12947         (setq gnus-newsgroup-unselected (delq art gnus-newsgroup-unselected))))
12948     ;; Let the Gnus agent mark articles as read.
12949     (when gnus-agent
12950       (gnus-agent-get-undownloaded-list))
12951     ;; Remove list identifiers from subject
12952     (gnus-summary-remove-list-identifiers)
12953     ;; First and last article in this newsgroup.
12954     (when gnus-newsgroup-headers
12955       (setq gnus-newsgroup-begin
12956             (mail-header-number (car gnus-newsgroup-headers))
12957             gnus-newsgroup-end
12958             (mail-header-number
12959              (gnus-last-element gnus-newsgroup-headers))))
12960     (when gnus-use-scoring
12961       (gnus-possibly-score-headers))))
12962
12963 (defun gnus-summary-insert-old-articles (&optional all)
12964   "Insert all old articles in this group.
12965 If ALL is non-nil, already read articles become readable.
12966 If ALL is a number, fetch this number of articles."
12967   (interactive "P")
12968   (prog1
12969       (let ((old (sort (mapcar 'car gnus-newsgroup-data) '<))
12970             older len)
12971         (setq older
12972               ;; Some nntp servers lie about their active range.  When
12973               ;; this happens, the active range can be in the millions.
12974               ;; Use a compressed range to avoid creating a huge list.
12975               (gnus-range-difference
12976                (gnus-range-difference (list gnus-newsgroup-active) old)
12977                gnus-newsgroup-unexist))
12978         (setq len (gnus-range-length older))
12979         (cond
12980          ((null older) nil)
12981          ((numberp all)
12982           (if (< all len)
12983               (let ((older-range (nreverse older)))
12984                 (setq older nil)
12985
12986                 (while (> all 0)
12987                   (let* ((r (pop older-range))
12988                          (min (if (numberp r) r (car r)))
12989                          (max (if (numberp r) r (cdr r))))
12990                     (while (and (<= min max)
12991                                 (> all 0))
12992                       (push max older)
12993                       (setq all (1- all)
12994                             max (1- max))))))
12995             (setq older (gnus-uncompress-range older))))
12996          (all
12997           (setq older (gnus-uncompress-range older)))
12998          (t
12999           (when (and (numberp gnus-large-newsgroup)
13000                    (> len gnus-large-newsgroup))
13001               (let* ((cursor-in-echo-area nil)
13002                      (initial (gnus-parameter-large-newsgroup-initial
13003                                gnus-newsgroup-name))
13004                      (input
13005                       (read-string
13006                        (format
13007                         "How many articles from %s (%s %d): "
13008                         (gnus-group-decoded-name gnus-newsgroup-name)
13009                         (if initial "max" "default")
13010                         len)
13011                        nil nil
13012                        (and initial
13013                             (number-to-string initial)))))
13014                 (unless (string-match "^[ \t]*$" input)
13015                   (setq all (string-to-number input))
13016                   (if (< all len)
13017                       (let ((older-range (nreverse older)))
13018                         (setq older nil)
13019
13020                         (while (> all 0)
13021                           (let* ((r (pop older-range))
13022                                  (min (if (numberp r) r (car r)))
13023                                  (max (if (numberp r) r (cdr r))))
13024                             (while (and (<= min max)
13025                                         (> all 0))
13026                               (push max older)
13027                               (setq all (1- all)
13028                                     max (1- max))))))))))
13029           (setq older (gnus-uncompress-range older))))
13030         (if (not older)
13031             (message "No old news.")
13032           (gnus-summary-insert-articles older)
13033           (gnus-summary-limit (gnus-sorted-nunion old older))))
13034     (gnus-summary-position-point)))
13035
13036 (defun gnus-summary-insert-new-articles ()
13037   "Insert all new articles in this group."
13038   (interactive)
13039   (let ((old (sort (mapcar 'car gnus-newsgroup-data) '<))
13040         (old-high gnus-newsgroup-highest)
13041         (nnmail-fetched-sources (list t))
13042         (new-active (gnus-activate-group gnus-newsgroup-name 'scan))
13043         i new)
13044     (unless new-active
13045       (error "Couldn't fetch new data"))
13046     (setq gnus-newsgroup-active (gnus-copy-sequence new-active))
13047     (setq i (cdr gnus-newsgroup-active)
13048           gnus-newsgroup-highest i)
13049     (while (> i old-high)
13050       (push i new)
13051       (decf i))
13052     (if (not new)
13053         (message "No gnus is bad news")
13054       (gnus-summary-insert-articles new)
13055       (setq gnus-newsgroup-unreads
13056             (gnus-sorted-nunion gnus-newsgroup-unreads new))
13057       (gnus-summary-limit (gnus-sorted-nunion old new))))
13058   (gnus-summary-position-point))
13059
13060 ;;; Bookmark support for Gnus.
13061 (declare-function gnus-article-show-summary "gnus-art" ())
13062 (declare-function bookmark-make-record-default
13063                   "bookmark" (&optional no-file no-context posn))
13064 (declare-function bookmark-prop-get "bookmark" (bookmark prop))
13065 (declare-function bookmark-default-handler "bookmark" (bmk))
13066 (declare-function bookmark-get-bookmark-record "bookmark" (bmk))
13067 (defvar bookmark-yank-point)
13068 (defvar bookmark-current-buffer)
13069
13070 (defun gnus-summary-bookmark-make-record ()
13071   "Make a bookmark entry for a Gnus summary buffer."
13072   (let (pos buf)
13073     (unless (and (derived-mode-p 'gnus-summary-mode) gnus-article-current)
13074       (save-restriction              ; FIXME is it necessary to widen?
13075         (widen) (setq pos (point))) ; Set position in gnus-article buffer.
13076       (setq buf "art") ; We are recording bookmark from article buffer.
13077       (setq bookmark-yank-point (point))
13078       (setq bookmark-current-buffer (current-buffer))
13079       (gnus-article-show-summary))      ; Go back in summary buffer.
13080     ;; We are now recording bookmark from summary buffer.
13081     (unless buf (setq buf "sum"))
13082     (let* ((subject (elt (gnus-summary-article-header) 1))
13083            (grp     (car gnus-article-current))
13084            (art     (cdr gnus-article-current))
13085            (head    (gnus-summary-article-header art))
13086            (id      (mail-header-id head)))
13087       `(,subject
13088         ,@(condition-case nil
13089               (bookmark-make-record-default 'no-file 'no-context pos)
13090             (wrong-number-of-arguments
13091              (bookmark-make-record-default 'point-only)))
13092         (location . ,(format "Gnus-%s %s:%d:%s" buf grp art id))
13093         (group . ,grp) (article . ,art)
13094         (message-id . ,id) (handler . gnus-summary-bookmark-jump)))))
13095
13096 ;;;###autoload
13097 (defun gnus-summary-bookmark-jump (bookmark)
13098   "Handler function for record returned by `gnus-summary-bookmark-make-record'.
13099 BOOKMARK is a bookmark name or a bookmark record."
13100   (let ((group    (bookmark-prop-get bookmark 'group))
13101         (article  (bookmark-prop-get bookmark 'article))
13102         (id       (bookmark-prop-get bookmark 'message-id))
13103         (buf      (car (split-string (bookmark-prop-get bookmark 'location)))))
13104     (gnus-fetch-group group (list article))
13105     (gnus-summary-insert-cached-articles)
13106     (gnus-summary-goto-article id nil 'force)
13107     ;; FIXME we have to wait article buffer is ready (only large buffer)
13108     ;; Is there a better solution to know that?
13109     ;; If we don't wait `bookmark-default-handler' will have no chance
13110     ;; to set position. However there is no error, just wrong pos.
13111     (sit-for 1)
13112     (when (string= buf "Gnus-art")
13113       (other-window 1))
13114     (bookmark-default-handler
13115      `(""
13116        (buffer . ,(current-buffer))
13117        . ,(bookmark-get-bookmark-record bookmark)))))
13118
13119 (gnus-summary-make-all-marking-commands)
13120
13121 (gnus-ems-redefine)
13122
13123 (provide 'gnus-sum)
13124
13125 (run-hooks 'gnus-sum-load-hook)
13126
13127 ;; Local Variables:
13128 ;; coding: utf-8
13129 ;; End:
13130
13131 ;;; gnus-sum.el ends here