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               ["Remove images" gnus-article-remove-images t]
2428               ["Toggle smiley" gnus-treat-smiley t]
2429               ["Show X-Face" gnus-article-display-x-face t]
2430               ["Show picons in From" gnus-treat-from-picon t]
2431               ["Show picons in mail headers" gnus-treat-mail-picon t]
2432               ["Show picons in news headers" gnus-treat-newsgroups-picon t]
2433               ["Show Gravatars in From" gnus-treat-from-gravatar t]
2434               ["Show Gravatars in mail headers" gnus-treat-mail-gravatar t]
2435               ("View as different encoding"
2436                ,@(gnus-summary-menu-split
2437                   (mapcar
2438                    (lambda (cs)
2439                      ;; Since easymenu under Emacs doesn't allow
2440                      ;; lambda forms for menu commands, we should
2441                      ;; provide intern'ed function symbols.
2442                      (let ((command (intern (format "\
2443 gnus-summary-show-article-from-menu-as-charset-%s" cs))))
2444                        (fset command
2445                              `(lambda ()
2446                                 (interactive)
2447                                 (let ((gnus-summary-show-article-charset-alist
2448                                        '((1 . ,cs))))
2449                                   (gnus-summary-show-article 1))))
2450                        `[,(symbol-name cs) ,command t]))
2451                    (sort (if (fboundp 'coding-system-list)
2452                              (coding-system-list)
2453                            (mapcar 'car mm-mime-mule-charset-alist))
2454                          'string<)))))
2455              ("Washing"
2456               ("Remove Blanks"
2457                ["Leading" gnus-article-strip-leading-blank-lines t]
2458                ["Multiple" gnus-article-strip-multiple-blank-lines t]
2459                ["Trailing" gnus-article-remove-trailing-blank-lines t]
2460                ["All of the above" gnus-article-strip-blank-lines t]
2461                ["All" gnus-article-strip-all-blank-lines t]
2462                ["Leading space" gnus-article-strip-leading-space t]
2463                ["Trailing space" gnus-article-strip-trailing-space t]
2464                ["Leading space in headers"
2465                 gnus-article-remove-leading-whitespace t])
2466               ["Overstrike" gnus-article-treat-overstrike t]
2467               ["Dumb quotes" gnus-article-treat-dumbquotes t]
2468               ["Non-ASCII" gnus-article-treat-non-ascii t]
2469               ["Emphasis" gnus-article-emphasize t]
2470               ["Word wrap" gnus-article-fill-cited-article t]
2471               ["Fill long lines" gnus-article-fill-long-lines t]
2472               ["Toggle truncate long lines" gnus-article-toggle-truncate-lines t]
2473               ["Capitalize sentences" gnus-article-capitalize-sentences t]
2474               ["Remove CR" gnus-article-remove-cr t]
2475               ["Quoted-Printable" gnus-article-de-quoted-unreadable t]
2476               ["Base64" gnus-article-de-base64-unreadable t]
2477               ["Rot 13" gnus-summary-caesar-message
2478                ,@(if (featurep 'xemacs) '(t)
2479                    '(:help "\"Caesar rotate\" article by 13"))]
2480               ["De-IDNA" gnus-summary-idna-message t]
2481               ["Morse decode" gnus-summary-morse-message t]
2482               ["Unix pipe..." gnus-summary-pipe-message t]
2483               ["Add buttons" gnus-article-add-buttons t]
2484               ["Add buttons to head" gnus-article-add-buttons-to-head t]
2485               ["Stop page breaking" gnus-summary-stop-page-breaking t]
2486               ["Verbose header" gnus-summary-verbose-headers t]
2487               ["Toggle header" gnus-summary-toggle-header t]
2488               ["Unfold headers" gnus-article-treat-unfold-headers t]
2489               ["Fold newsgroups" gnus-article-treat-fold-newsgroups t]
2490               ["Html" gnus-article-wash-html t]
2491               ["Unsplit URLs" gnus-article-unsplit-urls t]
2492               ["Verify X-PGP-Sig" gnus-article-verify-x-pgp-sig t]
2493               ["Decode HZ" gnus-article-decode-HZ t]
2494               ["ANSI sequences" gnus-article-treat-ansi-sequences t]
2495               ("(Outlook) Deuglify"
2496                ["Unwrap lines" gnus-article-outlook-unwrap-lines t]
2497                ["Repair attribution" gnus-article-outlook-repair-attribution t]
2498                ["Rearrange citation" gnus-article-outlook-rearrange-citation t]
2499                ["Full (Outlook) deuglify"
2500                 gnus-article-outlook-deuglify-article t])
2501               )
2502              ("Output"
2503               ["Save in default format..." gnus-summary-save-article
2504                ,@(if (featurep 'xemacs) '(t)
2505                    '(:help "Save article using default method"))]
2506               ["Save in file..." gnus-summary-save-article-file
2507                ,@(if (featurep 'xemacs) '(t)
2508                    '(:help "Save article in file"))]
2509               ["Save in Unix mail format..." gnus-summary-save-article-mail t]
2510               ["Save in MH folder..." gnus-summary-save-article-folder t]
2511               ["Save in VM folder..." gnus-summary-save-article-vm t]
2512               ["Save in RMAIL mbox..." gnus-summary-save-article-rmail t]
2513               ["Save body in file..." gnus-summary-save-article-body-file t]
2514               ["Pipe through a filter..." gnus-summary-pipe-output t]
2515               ["Print with Muttprint..." gnus-summary-muttprint t]
2516               ["Print" gnus-summary-print-article
2517                ,@(if (featurep 'xemacs) '(t)
2518                    '(:help "Generate and print a PostScript image"))])
2519              ("Copy, move,... (Backend)"
2520               ,@(if (featurep 'xemacs) nil
2521                   '(:help "Copying, moving, expiring articles..."))
2522               ["Respool article..." gnus-summary-respool-article t]
2523               ["Move article..." gnus-summary-move-article
2524                (gnus-check-backend-function
2525                 'request-move-article gnus-newsgroup-name)]
2526               ["Copy article..." gnus-summary-copy-article t]
2527               ["Crosspost article..." gnus-summary-crosspost-article
2528                (gnus-check-backend-function
2529                 'request-replace-article gnus-newsgroup-name)]
2530               ["Import file..." gnus-summary-import-article
2531                (gnus-check-backend-function
2532                 'request-accept-article gnus-newsgroup-name)]
2533               ["Create article..." gnus-summary-create-article
2534                (gnus-check-backend-function
2535                 'request-accept-article gnus-newsgroup-name)]
2536               ["Check if posted" gnus-summary-article-posted-p t]
2537               ["Edit article" gnus-summary-edit-article
2538                (not (gnus-group-read-only-p))]
2539               ["Delete article" gnus-summary-delete-article
2540                (gnus-check-backend-function
2541                 'request-expire-articles gnus-newsgroup-name)]
2542               ["Query respool" gnus-summary-respool-query t]
2543               ["Trace respool" gnus-summary-respool-trace t]
2544               ["Delete expirable articles" gnus-summary-expire-articles-now
2545                (gnus-check-backend-function
2546                 'request-expire-articles gnus-newsgroup-name)])
2547              ("Extract"
2548               ["Uudecode" gnus-uu-decode-uu
2549                ,@(if (featurep 'xemacs) '(t)
2550                    '(:help "Decode uuencoded article(s)"))]
2551               ["Uudecode and save" gnus-uu-decode-uu-and-save t]
2552               ["Unshar" gnus-uu-decode-unshar t]
2553               ["Unshar and save" gnus-uu-decode-unshar-and-save t]
2554               ["Save" gnus-uu-decode-save t]
2555               ["Binhex" gnus-uu-decode-binhex t]
2556               ["PostScript" gnus-uu-decode-postscript t]
2557               ["All MIME parts" gnus-summary-save-parts t])
2558              ("Cache"
2559               ["Enter article" gnus-cache-enter-article t]
2560               ["Remove article" gnus-cache-remove-article t])
2561              ["Translate" gnus-article-babel t]
2562              ["Select article buffer" gnus-summary-select-article-buffer t]
2563              ["Make article buffer sticky" gnus-sticky-article t]
2564              ["Enter digest buffer" gnus-summary-enter-digest-group t]
2565              ["Isearch article..." gnus-summary-isearch-article t]
2566              ["Beginning of the article" gnus-summary-beginning-of-article t]
2567              ["End of the article" gnus-summary-end-of-article t]
2568              ["Fetch parent of article" gnus-summary-refer-parent-article t]
2569              ["Fetch referenced articles" gnus-summary-refer-references t]
2570              ["Fetch current thread" gnus-summary-refer-thread t]
2571              ["Fetch article with id..." gnus-summary-refer-article t]
2572              ["Setup Mailing List Params" gnus-mailing-list-insinuate t]
2573              ["Redisplay" gnus-summary-show-article t]
2574              ["Raw article" gnus-summary-show-raw-article :keys "C-u g"])))
2575       (easy-menu-define
2576         gnus-summary-article-menu gnus-summary-mode-map ""
2577         (cons "Article" innards))
2578
2579       (if (not (keymapp gnus-summary-article-menu))
2580           (easy-menu-define
2581             gnus-article-commands-menu gnus-article-mode-map ""
2582             (cons "Commands" innards))
2583         ;; in Emacs, don't share menu.
2584         (setq gnus-article-commands-menu
2585               (copy-keymap gnus-summary-article-menu))
2586         (define-key gnus-article-mode-map [menu-bar commands]
2587           (cons "Commands" gnus-article-commands-menu))))
2588
2589     (easy-menu-define
2590       gnus-summary-thread-menu gnus-summary-mode-map ""
2591       '("Threads"
2592         ["Find all messages in thread" gnus-summary-refer-thread t]
2593         ["Toggle threading" gnus-summary-toggle-threads t]
2594         ["Hide threads" gnus-summary-hide-all-threads t]
2595         ["Show threads" gnus-summary-show-all-threads t]
2596         ["Hide thread" gnus-summary-hide-thread t]
2597         ["Show thread" gnus-summary-show-thread t]
2598         ["Go to next thread" gnus-summary-next-thread t]
2599         ["Go to previous thread" gnus-summary-prev-thread t]
2600         ["Go down thread" gnus-summary-down-thread t]
2601         ["Go up thread" gnus-summary-up-thread t]
2602         ["Top of thread" gnus-summary-top-thread t]
2603         ["Mark thread as read" gnus-summary-kill-thread t]
2604         ["Mark thread as expired" gnus-summary-expire-thread t]
2605         ["Lower thread score" gnus-summary-lower-thread t]
2606         ["Raise thread score" gnus-summary-raise-thread t]
2607         ["Rethread current" gnus-summary-rethread-current t]))
2608
2609     (easy-menu-define
2610       gnus-summary-post-menu gnus-summary-mode-map ""
2611       `("Post"
2612         ["Send a message (mail or news)" gnus-summary-post-news
2613          ,@(if (featurep 'xemacs) '(t)
2614              '(:help "Compose a new message (mail or news)"))]
2615         ["Followup" gnus-summary-followup
2616          ,@(if (featurep 'xemacs) '(t)
2617              '(:help "Post followup to this article"))]
2618         ["Followup and yank" gnus-summary-followup-with-original
2619          ,@(if (featurep 'xemacs) '(t)
2620              '(:help "Post followup to this article, quoting its contents"))]
2621         ["Supersede article" gnus-summary-supersede-article t]
2622         ["Cancel article" gnus-summary-cancel-article
2623          ,@(if (featurep 'xemacs) '(t)
2624              '(:help "Cancel an article you posted"))]
2625         ["Reply" gnus-summary-reply t]
2626         ["Reply and yank" gnus-summary-reply-with-original t]
2627         ["Wide reply" gnus-summary-wide-reply t]
2628         ["Wide reply and yank" gnus-summary-wide-reply-with-original
2629          ,@(if (featurep 'xemacs) '(t)
2630              '(:help "Mail a reply, quoting this article"))]
2631         ["Very wide reply" gnus-summary-very-wide-reply t]
2632         ["Very wide reply and yank" gnus-summary-very-wide-reply-with-original
2633          ,@(if (featurep 'xemacs) '(t)
2634              '(:help "Mail a very wide reply, quoting this article"))]
2635         ["Mail forward" gnus-summary-mail-forward t]
2636         ["Post forward" gnus-summary-post-forward t]
2637         ["Digest and mail" gnus-uu-digest-mail-forward t]
2638         ["Digest and post" gnus-uu-digest-post-forward t]
2639         ["Resend message" gnus-summary-resend-message t]
2640         ["Resend message edit" gnus-summary-resend-message-edit t]
2641         ["Send bounced mail" gnus-summary-resend-bounced-mail t]
2642         ["Send a mail" gnus-summary-mail-other-window t]
2643         ["Create a local message" gnus-summary-news-other-window t]
2644         ["Uuencode and post" gnus-uu-post-news
2645          ,@(if (featurep 'xemacs) '(t)
2646              '(:help "Post a uuencoded article"))]
2647         ["Followup via news" gnus-summary-followup-to-mail t]
2648         ["Followup via news and yank"
2649          gnus-summary-followup-to-mail-with-original t]
2650         ["Strip signature on reply"
2651          (lambda ()
2652            (interactive)
2653            (if (not (memq message-cite-function
2654                           '(message-cite-original-without-signature
2655                             message-cite-original)))
2656                ;; Stupid workaround for XEmacs not honoring :visible.
2657                (message "Can't toggle this value of `message-cite-function'")
2658              (setq message-cite-function
2659                    (if (eq message-cite-function
2660                            'message-cite-original-without-signature)
2661                        'message-cite-original
2662                      'message-cite-original-without-signature))))
2663          ;; XEmacs barfs on :visible.
2664          ,@(if (featurep 'xemacs) nil
2665              '(:visible (memq message-cite-function
2666                               '(message-cite-original-without-signature
2667                                 message-cite-original))))
2668          :style toggle
2669          :selected (eq message-cite-function
2670                        'message-cite-original-without-signature)
2671          ,@(if (featurep 'xemacs) nil
2672              '(:help "Strip signature from cited article when replying."))]
2673         ;;("Draft"
2674         ;;["Send" gnus-summary-send-draft t]
2675         ;;["Send bounced" gnus-resend-bounced-mail t])
2676         ))
2677
2678     (cond
2679      ((not (keymapp gnus-summary-post-menu))
2680       (setq gnus-article-post-menu gnus-summary-post-menu))
2681      ((not gnus-article-post-menu)
2682       ;; Don't share post menu.
2683       (setq gnus-article-post-menu
2684             (copy-keymap gnus-summary-post-menu))))
2685     (define-key gnus-article-mode-map [menu-bar post]
2686       (cons "Post" gnus-article-post-menu))
2687
2688     (easy-menu-define
2689       gnus-summary-misc-menu gnus-summary-mode-map ""
2690       `("Gnus"
2691         ("Mark Read"
2692          ["Mark as read" gnus-summary-mark-as-read-forward t]
2693          ["Mark same subject and select"
2694           gnus-summary-kill-same-subject-and-select t]
2695          ["Mark same subject" gnus-summary-kill-same-subject t]
2696          ["Catchup" gnus-summary-catchup
2697           ,@(if (featurep 'xemacs) '(t)
2698               '(:help "Mark unread articles in this group as read"))]
2699          ["Catchup all" gnus-summary-catchup-all t]
2700          ["Catchup to here" gnus-summary-catchup-to-here t]
2701          ["Catchup from here" gnus-summary-catchup-from-here t]
2702          ["Catchup region" gnus-summary-mark-region-as-read
2703           (gnus-mark-active-p)]
2704          ["Mark excluded" gnus-summary-limit-mark-excluded-as-read t])
2705         ("Mark Various"
2706          ["Tick" gnus-summary-tick-article-forward t]
2707          ["Mark as dormant" gnus-summary-mark-as-dormant t]
2708          ["Remove marks" gnus-summary-clear-mark-forward t]
2709          ["Set expirable mark" gnus-summary-mark-as-expirable t]
2710          ["Set bookmark" gnus-summary-set-bookmark t]
2711          ["Remove bookmark" gnus-summary-remove-bookmark t])
2712         ("Limit to"
2713          ["Marks..." gnus-summary-limit-to-marks t]
2714          ["Subject..." gnus-summary-limit-to-subject t]
2715          ["Author..." gnus-summary-limit-to-author t]
2716          ["Recipient..." gnus-summary-limit-to-recipient t]
2717          ["Address..." gnus-summary-limit-to-address t]
2718          ["Age..." gnus-summary-limit-to-age t]
2719          ["Extra..." gnus-summary-limit-to-extra t]
2720          ["Score..." gnus-summary-limit-to-score t]
2721          ["Display Predicate" gnus-summary-limit-to-display-predicate t]
2722          ["Unread" gnus-summary-limit-to-unread t]
2723          ["Unseen" gnus-summary-limit-to-unseen t]
2724          ["Singletons" gnus-summary-limit-to-singletons t]
2725          ["Replied" gnus-summary-limit-to-replied t]
2726          ["Non-dormant" gnus-summary-limit-exclude-dormant t]
2727          ["Next or process marked articles" gnus-summary-limit-to-articles t]
2728          ["Pop limit" gnus-summary-pop-limit t]
2729          ["Show dormant" gnus-summary-limit-include-dormant t]
2730          ["Hide childless dormant"
2731           gnus-summary-limit-exclude-childless-dormant t]
2732          ;;["Hide thread" gnus-summary-limit-exclude-thread t]
2733          ["Hide marked" gnus-summary-limit-exclude-marks t]
2734          ["Show expunged" gnus-summary-limit-include-expunged t])
2735         ("Process Mark"
2736          ["Set mark" gnus-summary-mark-as-processable t]
2737          ["Remove mark" gnus-summary-unmark-as-processable t]
2738          ["Remove all marks" gnus-summary-unmark-all-processable t]
2739          ["Invert marks" gnus-uu-invert-processable t]
2740          ["Mark above" gnus-uu-mark-over t]
2741          ["Mark series" gnus-uu-mark-series t]
2742          ["Mark region" gnus-uu-mark-region (gnus-mark-active-p)]
2743          ["Unmark region" gnus-uu-unmark-region (gnus-mark-active-p)]
2744          ["Mark by regexp..." gnus-uu-mark-by-regexp t]
2745          ["Unmark by regexp..." gnus-uu-unmark-by-regexp t]
2746          ["Mark all" gnus-uu-mark-all t]
2747          ["Mark buffer" gnus-uu-mark-buffer t]
2748          ["Mark sparse" gnus-uu-mark-sparse t]
2749          ["Mark thread" gnus-uu-mark-thread t]
2750          ["Unmark thread" gnus-uu-unmark-thread t]
2751          ("Process Mark Sets"
2752           ["Kill" gnus-summary-kill-process-mark t]
2753           ["Yank" gnus-summary-yank-process-mark
2754            gnus-newsgroup-process-stack]
2755           ["Save" gnus-summary-save-process-mark t]
2756           ["Run command on marked..." gnus-summary-universal-argument t]))
2757         ("Registry Marks")
2758         ("Scroll article"
2759          ["Page forward" gnus-summary-next-page
2760           ,@(if (featurep 'xemacs) '(t)
2761               '(:help "Show next page of article"))]
2762          ["Page backward" gnus-summary-prev-page
2763           ,@(if (featurep 'xemacs) '(t)
2764               '(:help "Show previous page of article"))]
2765          ["Line forward" gnus-summary-scroll-up t])
2766         ("Move"
2767          ["Next unread article" gnus-summary-next-unread-article t]
2768          ["Previous unread article" gnus-summary-prev-unread-article t]
2769          ["Next article" gnus-summary-next-article t]
2770          ["Previous article" gnus-summary-prev-article t]
2771          ["Next unread subject" gnus-summary-next-unread-subject t]
2772          ["Previous unread subject" gnus-summary-prev-unread-subject t]
2773          ["Next article same subject" gnus-summary-next-same-subject t]
2774          ["Previous article same subject" gnus-summary-prev-same-subject t]
2775          ["First unread article" gnus-summary-first-unread-article t]
2776          ["Best unread article" gnus-summary-best-unread-article t]
2777          ["Go to subject number..." gnus-summary-goto-subject t]
2778          ["Go to article number..." gnus-summary-goto-article t]
2779          ["Go to the last article" gnus-summary-goto-last-article t]
2780          ["Pop article off history" gnus-summary-pop-article t])
2781         ("Sort"
2782          ["Sort by number" gnus-summary-sort-by-number t]
2783          ["Sort by most recent number" gnus-summary-sort-by-most-recent-number t]
2784          ["Sort by author" gnus-summary-sort-by-author t]
2785          ["Sort by recipient" gnus-summary-sort-by-recipient t]
2786          ["Sort by subject" gnus-summary-sort-by-subject t]
2787          ["Sort by date" gnus-summary-sort-by-date t]
2788          ["Sort by most recent date" gnus-summary-sort-by-most-recent-date t]
2789          ["Sort by score" gnus-summary-sort-by-score t]
2790          ["Sort by lines" gnus-summary-sort-by-lines t]
2791          ["Sort by characters" gnus-summary-sort-by-chars t]
2792          ["Randomize" gnus-summary-sort-by-random t]
2793          ["Original sort" gnus-summary-sort-by-original t])
2794         ("Help"
2795          ["Describe group" gnus-summary-describe-group t]
2796          ["Read manual" gnus-info-find-node t])
2797         ("Modes"
2798          ["Pick and read" gnus-pick-mode t]
2799          ["Binary" gnus-binary-mode t])
2800         ("Regeneration"
2801          ["Regenerate" gnus-summary-prepare t]
2802          ["Insert cached articles" gnus-summary-insert-cached-articles t]
2803          ["Insert dormant articles" gnus-summary-insert-dormant-articles t]
2804          ["Insert ticked articles" gnus-summary-insert-ticked-articles t]
2805          ["Toggle threading" gnus-summary-toggle-threads t])
2806         ["See old articles" gnus-summary-insert-old-articles t]
2807         ["See new articles" gnus-summary-insert-new-articles t]
2808         ["Filter articles..." gnus-summary-execute-command t]
2809         ["Run command on articles..." gnus-summary-universal-argument t]
2810         ["Search articles forward..." gnus-summary-search-article-forward t]
2811         ["Search articles backward..." gnus-summary-search-article-backward t]
2812         ["Toggle line truncation" gnus-summary-toggle-truncation t]
2813         ["Expand window" gnus-summary-expand-window t]
2814         ["Expire expirable articles" gnus-summary-expire-articles
2815          (gnus-check-backend-function
2816           'request-expire-articles gnus-newsgroup-name)]
2817         ["Edit local kill file" gnus-summary-edit-local-kill t]
2818         ["Edit main kill file" gnus-summary-edit-global-kill t]
2819         ["Edit group parameters" gnus-summary-edit-parameters t]
2820         ["Customize group parameters" gnus-summary-customize-parameters t]
2821         ["Send a bug report" gnus-bug t]
2822         ("Exit"
2823          ["Catchup and exit" gnus-summary-catchup-and-exit
2824           ,@(if (featurep 'xemacs) '(t)
2825               '(:help "Mark unread articles in this group as read, then exit"))]
2826          ["Catchup all and exit" gnus-summary-catchup-all-and-exit t]
2827          ["Catchup and goto next" gnus-summary-catchup-and-goto-next-group t]
2828          ["Catchup and goto prev" gnus-summary-catchup-and-goto-prev-group t]
2829          ["Exit group" gnus-summary-exit
2830           ,@(if (featurep 'xemacs) '(t)
2831               '(:help "Exit current group, return to group selection mode"))]
2832          ["Exit group without updating" gnus-summary-exit-no-update t]
2833          ["Exit and goto next group" gnus-summary-next-group t]
2834          ["Exit and goto prev group" gnus-summary-prev-group t]
2835          ["Reselect group" gnus-summary-reselect-current-group t]
2836          ["Rescan group" gnus-summary-rescan-group t]
2837          ["Update dribble" gnus-summary-save-newsrc t])))
2838
2839     (gnus-run-hooks 'gnus-summary-menu-hook)))
2840
2841 (defvar gnus-summary-tool-bar-map nil)
2842
2843 ;; Note: The :set function in the `gnus-summary-tool-bar*' variables will only
2844 ;; affect _new_ message buffers.  We might add a function that walks thru all
2845 ;; summary-mode buffers and force the update.
2846 (defun gnus-summary-tool-bar-update (&optional symbol value)
2847   "Update summary mode toolbar.
2848 Setter function for custom variables."
2849   (setq-default gnus-summary-tool-bar-map nil)
2850   (when symbol
2851     ;; When used as ":set" function:
2852     (set-default symbol value))
2853   (when (gnus-buffer-live-p gnus-summary-buffer)
2854     (with-current-buffer gnus-summary-buffer
2855       (gnus-summary-make-tool-bar))))
2856
2857 (defcustom gnus-summary-tool-bar (if (eq gmm-tool-bar-style 'gnome)
2858                                      'gnus-summary-tool-bar-gnome
2859                                    'gnus-summary-tool-bar-retro)
2860   "Specifies the Gnus summary tool bar.
2861
2862 It can be either a list or a symbol referring to a list.  See
2863 `gmm-tool-bar-from-list' for the format of the list.  The
2864 default key map is `gnus-summary-mode-map'.
2865
2866 Pre-defined symbols include `gnus-summary-tool-bar-gnome' and
2867 `gnus-summary-tool-bar-retro'."
2868   :type '(choice (const :tag "GNOME style" gnus-summary-tool-bar-gnome)
2869                  (const :tag "Retro look"  gnus-summary-tool-bar-retro)
2870                  (repeat :tag "User defined list" gmm-tool-bar-item)
2871                  (symbol))
2872   :version "23.1" ;; No Gnus
2873   :initialize 'custom-initialize-default
2874   :set 'gnus-summary-tool-bar-update
2875   :group 'gnus-summary)
2876
2877 (defcustom gnus-summary-tool-bar-gnome
2878   '((gnus-summary-post-news "mail/compose" nil)
2879     (gnus-summary-insert-new-articles "mail/inbox" nil
2880                                       :visible (or (not gnus-agent)
2881                                                    gnus-plugged))
2882     (gnus-summary-reply-with-original "mail/reply")
2883     (gnus-summary-reply "mail/reply" nil :visible nil)
2884     (gnus-summary-followup-with-original "mail/reply-all")
2885     (gnus-summary-followup "mail/reply-all" nil :visible nil)
2886     (gnus-summary-mail-forward "mail/forward")
2887     (gnus-summary-save-article "mail/save")
2888     (gnus-summary-search-article-forward "search" nil :visible nil)
2889     (gnus-summary-print-article "print")
2890     (gnus-summary-tick-article-forward "flag-followup" nil :visible nil)
2891     ;; Some new commands that may need more suitable icons:
2892     (gnus-summary-save-newsrc "save" nil :visible nil)
2893     ;; (gnus-summary-show-article "stock_message-display" nil :visible nil)
2894     (gnus-summary-prev-article "left-arrow")
2895     (gnus-summary-next-article "right-arrow")
2896     (gnus-summary-next-page "next-page")
2897     ;; (gnus-summary-enter-digest-group "right_arrow" nil :visible nil)
2898     ;;
2899     ;; Maybe some sort-by-... could be added:
2900     ;; (gnus-summary-sort-by-author "sort-a-z" nil :visible nil)
2901     ;; (gnus-summary-sort-by-date "sort-1-9" nil :visible nil)
2902     (gnus-summary-mark-as-expirable
2903      "delete" nil
2904      :visible (gnus-check-backend-function 'request-expire-articles
2905                                            gnus-newsgroup-name))
2906     (gnus-summary-mark-as-spam
2907      "mail/spam" t
2908      :visible (and (fboundp 'spam-group-ham-contents-p)
2909                    (spam-group-ham-contents-p gnus-newsgroup-name))
2910      :help "Mark as spam")
2911     (gnus-summary-mark-as-read-forward
2912      "mail/not-spam" nil
2913      :visible (and (fboundp 'spam-group-spam-contents-p)
2914                    (spam-group-spam-contents-p gnus-newsgroup-name)))
2915     ;;
2916     (gnus-summary-exit "exit")
2917     (gmm-customize-mode "preferences" t :help "Edit mode preferences")
2918     (gnus-info-find-node "help"))
2919   "List of functions for the summary tool bar (GNOME style).
2920
2921 See `gmm-tool-bar-from-list' for the format of the list."
2922   :type '(repeat gmm-tool-bar-item)
2923   :version "23.1" ;; No Gnus
2924   :initialize 'custom-initialize-default
2925   :set 'gnus-summary-tool-bar-update
2926   :group 'gnus-summary)
2927
2928 (defcustom gnus-summary-tool-bar-retro
2929   '((gnus-summary-prev-unread-article "gnus/prev-ur")
2930     (gnus-summary-next-unread-article "gnus/next-ur")
2931     (gnus-summary-post-news "gnus/post")
2932     (gnus-summary-followup-with-original "gnus/fuwo")
2933     (gnus-summary-followup "gnus/followup")
2934     (gnus-summary-reply-with-original "gnus/reply-wo")
2935     (gnus-summary-reply "gnus/reply")
2936     (gnus-summary-caesar-message "gnus/rot13")
2937     (gnus-uu-decode-uu "gnus/uu-decode")
2938     (gnus-summary-save-article-file "gnus/save-aif")
2939     (gnus-summary-save-article "gnus/save-art")
2940     (gnus-uu-post-news "gnus/uu-post")
2941     (gnus-summary-catchup "gnus/catchup")
2942     (gnus-summary-catchup-and-exit "gnus/cu-exit")
2943     (gnus-summary-exit "gnus/exit-summ")
2944     ;; Some new command that may need more suitable icons:
2945     (gnus-summary-print-article "gnus/print" nil :visible nil)
2946     (gnus-summary-mark-as-expirable "gnus/close" nil :visible nil)
2947     (gnus-summary-save-newsrc "gnus/save" nil :visible nil)
2948     ;; (gnus-summary-enter-digest-group "gnus/right_arrow" nil :visible nil)
2949     (gnus-summary-search-article-forward "gnus/search" nil :visible nil)
2950     ;; (gnus-summary-insert-new-articles "gnus/paste" nil :visible nil)
2951     ;; (gnus-summary-toggle-threads "gnus/open" nil :visible nil)
2952     ;;
2953     (gnus-info-find-node "gnus/help" nil :visible nil))
2954   "List of functions for the summary tool bar (retro look).
2955
2956 See `gmm-tool-bar-from-list' for the format of the list."
2957   :type '(repeat gmm-tool-bar-item)
2958   :version "23.1" ;; No Gnus
2959   :initialize 'custom-initialize-default
2960   :set 'gnus-summary-tool-bar-update
2961   :group 'gnus-summary)
2962
2963 (defcustom gnus-summary-tool-bar-zap-list t
2964   "List of icon items from the global tool bar.
2965 These items are not displayed in the Gnus summary mode tool bar.
2966
2967 See `gmm-tool-bar-from-list' for the format of the list."
2968   :type 'gmm-tool-bar-zap-list
2969   :version "23.1" ;; No Gnus
2970   :initialize 'custom-initialize-default
2971   :set 'gnus-summary-tool-bar-update
2972   :group 'gnus-summary)
2973
2974 (defvar image-load-path)
2975 (defvar tool-bar-map)
2976
2977 (defun gnus-summary-make-tool-bar (&optional force)
2978   "Make a summary mode tool bar from `gnus-summary-tool-bar'.
2979 When FORCE, rebuild the tool bar."
2980   (when (and (not (featurep 'xemacs))
2981              (boundp 'tool-bar-mode)
2982              tool-bar-mode
2983              (or (not gnus-summary-tool-bar-map) force))
2984     (let* ((load-path
2985             (gmm-image-load-path-for-library "gnus"
2986                                              "mail/save.xpm"
2987                                              nil t))
2988            (image-load-path (cons (car load-path)
2989                                   (when (boundp 'image-load-path)
2990                                     image-load-path)))
2991            (map (gmm-tool-bar-from-list gnus-summary-tool-bar
2992                                         gnus-summary-tool-bar-zap-list
2993                                         'gnus-summary-mode-map)))
2994       (when map
2995         ;; Need to set `gnus-summary-tool-bar-map' because `gnus-article-mode'
2996         ;; uses its value.
2997         (setq gnus-summary-tool-bar-map map))))
2998   (set (make-local-variable 'tool-bar-map) gnus-summary-tool-bar-map))
2999
3000 (defun gnus-make-score-map (type)
3001   "Make a summary score map of type TYPE."
3002   (if t
3003       nil
3004     (let ((headers '(("author" "from" string)
3005                      ("subject" "subject" string)
3006                      ("article body" "body" string)
3007                      ("article head" "head" string)
3008                      ("xref" "xref" string)
3009                      ("extra header" "extra" string)
3010                      ("lines" "lines" number)
3011                      ("followups to author" "followup" string)))
3012           (types '((number ("less than" <)
3013                            ("greater than" >)
3014                            ("equal" =))
3015                    (string ("substring" s)
3016                            ("exact string" e)
3017                            ("fuzzy string" f)
3018                            ("regexp" r))))
3019           (perms '(("temporary" (current-time-string))
3020                    ("permanent" nil)
3021                    ("immediate" now)))
3022           header)
3023       (list
3024        (apply
3025         'nconc
3026         (list
3027          (if (eq type 'lower)
3028              "Lower score"
3029            "Increase score"))
3030         (let (outh)
3031           (while headers
3032             (setq header (car headers))
3033             (setq outh
3034                   (cons
3035                    (apply
3036                     'nconc
3037                     (list (car header))
3038                     (let ((ts (cdr (assoc (nth 2 header) types)))
3039                           outt)
3040                       (while ts
3041                         (setq outt
3042                               (cons
3043                                (apply
3044                                 'nconc
3045                                 (list (caar ts))
3046                                 (let ((ps perms)
3047                                       outp)
3048                                   (while ps
3049                                     (setq outp
3050                                           (cons
3051                                            (vector
3052                                             (caar ps)
3053                                             (list
3054                                              'gnus-summary-score-entry
3055                                              (nth 1 header)
3056                                              (if (or (string= (nth 1 header)
3057                                                               "head")
3058                                                      (string= (nth 1 header)
3059                                                               "body"))
3060                                                  ""
3061                                                (list 'gnus-summary-header
3062                                                      (nth 1 header)))
3063                                              (list 'quote (nth 1 (car ts)))
3064                                              (list 'gnus-score-delta-default
3065                                                    nil)
3066                                              (nth 1 (car ps))
3067                                              t)
3068                                             t)
3069                                            outp))
3070                                     (setq ps (cdr ps)))
3071                                   (list (nreverse outp))))
3072                                outt))
3073                         (setq ts (cdr ts)))
3074                       (list (nreverse outt))))
3075                    outh))
3076             (setq headers (cdr headers)))
3077           (list (nreverse outh))))))))
3078
3079
3080 (declare-function turn-on-gnus-mailing-list-mode "gnus-ml" ())
3081 (defvar bookmark-make-record-function)
3082 \f
3083 (defvar bidi-paragraph-direction)
3084
3085 (defun gnus-summary-mode (&optional group)
3086   "Major mode for reading articles.
3087
3088 All normal editing commands are switched off.
3089 \\<gnus-summary-mode-map>
3090 Each line in this buffer represents one article.  To read an
3091 article, you can, for instance, type `\\[gnus-summary-next-page]'.  To move forwards
3092 and backwards while displaying articles, type `\\[gnus-summary-next-unread-article]' and `\\[gnus-summary-prev-unread-article]',
3093 respectively.
3094
3095 You can also post articles and send mail from this buffer.  To
3096 follow up an article, type `\\[gnus-summary-followup]'.  To mail a reply to the author
3097 of an article, type `\\[gnus-summary-reply]'.
3098
3099 There are approx. one gazillion commands you can execute in this
3100 buffer; read the info pages for more information (`\\[gnus-info-find-node]').
3101
3102 The following commands are available:
3103
3104 \\{gnus-summary-mode-map}"
3105   ;; FIXME: Use define-derived-mode.
3106   (interactive)
3107   (kill-all-local-variables)
3108   (let ((gnus-summary-local-variables gnus-newsgroup-variables))
3109     (gnus-summary-make-local-variables))
3110   (gnus-summary-make-local-variables)
3111   (setq gnus-newsgroup-name group)
3112   (when (gnus-visual-p 'summary-menu 'menu)
3113     (gnus-summary-make-menu-bar)
3114     (gnus-summary-make-tool-bar))
3115   (gnus-make-thread-indent-array)
3116   (gnus-simplify-mode-line)
3117   (setq major-mode 'gnus-summary-mode)
3118   (setq mode-name "Summary")
3119   (use-local-map gnus-summary-mode-map)
3120   (buffer-disable-undo)
3121   (setq buffer-read-only t              ;Disable modification
3122         show-trailing-whitespace nil)
3123   (setq truncate-lines t)
3124   ;; Force paragraph direction to be left-to-right.  Don't make it
3125   ;; bound globally in old Emacsen and XEmacsen.
3126   (set (make-local-variable 'bidi-paragraph-direction) 'left-to-right)
3127   (add-to-invisibility-spec '(gnus-sum . t))
3128   (gnus-summary-set-display-table)
3129   (gnus-set-default-directory)
3130   (make-local-variable 'gnus-summary-line-format)
3131   (make-local-variable 'gnus-summary-line-format-spec)
3132   (make-local-variable 'gnus-summary-dummy-line-format)
3133   (make-local-variable 'gnus-summary-dummy-line-format-spec)
3134   (make-local-variable 'gnus-summary-mark-positions)
3135   (gnus-make-local-hook 'pre-command-hook)
3136   (add-hook 'pre-command-hook 'gnus-set-global-variables nil t)
3137   (gnus-run-mode-hooks 'gnus-summary-mode-hook)
3138   (turn-on-gnus-mailing-list-mode)
3139   (mm-enable-multibyte)
3140   (set (make-local-variable 'bookmark-make-record-function)
3141        'gnus-summary-bookmark-make-record)
3142   (gnus-update-format-specifications nil 'summary 'summary-mode 'summary-dummy)
3143   (gnus-update-summary-mark-positions))
3144
3145 (defun gnus-summary-make-local-variables ()
3146   "Make all the local summary buffer variables."
3147   (let (global)
3148     (dolist (local gnus-summary-local-variables)
3149       (if (consp local)
3150           (progn
3151             (if (eq (cdr local) 'global)
3152                 ;; Copy the global value of the variable.
3153                 (setq global (symbol-value (car local)))
3154               ;; Use the value from the list.
3155               (setq global (eval (cdr local))))
3156             (set (make-local-variable (car local)) global))
3157         ;; Simple nil-valued local variable.
3158         (set (make-local-variable local) nil)))))
3159
3160 ;; Summary data functions.
3161
3162 (defmacro gnus-data-number (data)
3163   `(car ,data))
3164
3165 (defmacro gnus-data-set-number (data number)
3166   `(setcar ,data ,number))
3167
3168 (defmacro gnus-data-mark (data)
3169   `(nth 1 ,data))
3170
3171 (defmacro gnus-data-set-mark (data mark)
3172   `(setcar (nthcdr 1 ,data) ,mark))
3173
3174 (defmacro gnus-data-pos (data)
3175   `(nth 2 ,data))
3176
3177 (defmacro gnus-data-set-pos (data pos)
3178   `(setcar (nthcdr 2 ,data) ,pos))
3179
3180 (defmacro gnus-data-header (data)
3181   `(nth 3 ,data))
3182
3183 (defmacro gnus-data-set-header (data header)
3184   `(setf (nth 3 ,data) ,header))
3185
3186 (defmacro gnus-data-level (data)
3187   `(nth 4 ,data))
3188
3189 (defmacro gnus-data-unread-p (data)
3190   `(= (nth 1 ,data) gnus-unread-mark))
3191
3192 (defmacro gnus-data-read-p (data)
3193   `(/= (nth 1 ,data) gnus-unread-mark))
3194
3195 (defmacro gnus-data-pseudo-p (data)
3196   `(consp (nth 3 ,data)))
3197
3198 (defmacro gnus-data-find (number)
3199   `(assq ,number gnus-newsgroup-data))
3200
3201 (defmacro gnus-data-find-list (number &optional data)
3202   `(let ((bdata ,(or data 'gnus-newsgroup-data)))
3203      (memq (assq ,number bdata)
3204            bdata)))
3205
3206 (defmacro gnus-data-make (number mark pos header level)
3207   `(list ,number ,mark ,pos ,header ,level))
3208
3209 (defun gnus-data-enter (after-article number mark pos header level offset)
3210   (let ((data (gnus-data-find-list after-article)))
3211     (unless data
3212       (error "No such article: %d" after-article))
3213     (setcdr data (cons (gnus-data-make number mark pos header level)
3214                        (cdr data)))
3215     (setq gnus-newsgroup-data-reverse nil)
3216     (gnus-data-update-list (cddr data) offset)))
3217
3218 (defun gnus-data-enter-list (after-article list &optional offset)
3219   (when list
3220     (let ((data (and after-article (gnus-data-find-list after-article)))
3221           (ilist list))
3222       (if (not (or data
3223                    after-article))
3224           (let ((odata gnus-newsgroup-data))
3225             (setq gnus-newsgroup-data (nconc list gnus-newsgroup-data))
3226             (when offset
3227               (gnus-data-update-list odata offset)))
3228         ;; Find the last element in the list to be spliced into the main
3229         ;; list.
3230         (setq list (last list))
3231         (if (not data)
3232             (progn
3233               (setcdr list gnus-newsgroup-data)
3234               (setq gnus-newsgroup-data ilist)
3235               (when offset
3236                 (gnus-data-update-list (cdr list) offset)))
3237           (setcdr list (cdr data))
3238           (setcdr data ilist)
3239           (when offset
3240             (gnus-data-update-list (cdr list) offset))))
3241       (setq gnus-newsgroup-data-reverse nil))))
3242
3243 (defun gnus-data-remove (article &optional offset)
3244   (let ((data gnus-newsgroup-data))
3245     (if (= (gnus-data-number (car data)) article)
3246         (progn
3247           (setq gnus-newsgroup-data (cdr gnus-newsgroup-data)
3248                 gnus-newsgroup-data-reverse nil)
3249           (when offset
3250             (gnus-data-update-list gnus-newsgroup-data offset)))
3251       (while (cdr data)
3252         (when (= (gnus-data-number (cadr data)) article)
3253           (setcdr data (cddr data))
3254           (when offset
3255             (gnus-data-update-list (cdr data) offset))
3256           (setq data nil
3257                 gnus-newsgroup-data-reverse nil))
3258         (setq data (cdr data))))))
3259
3260 (defmacro gnus-data-list (backward)
3261   `(if ,backward
3262        (or gnus-newsgroup-data-reverse
3263            (setq gnus-newsgroup-data-reverse
3264                  (reverse gnus-newsgroup-data)))
3265      gnus-newsgroup-data))
3266
3267 (defun gnus-data-update-list (data offset)
3268   "Add OFFSET to the POS of all data entries in DATA."
3269   (setq gnus-newsgroup-data-reverse nil)
3270   (while data
3271     (setcar (nthcdr 2 (car data)) (+ offset (nth 2 (car data))))
3272     (setq data (cdr data))))
3273
3274 (defun gnus-summary-article-pseudo-p (article)
3275   "Say whether this article is a pseudo article or not."
3276   (not (vectorp (gnus-data-header (gnus-data-find article)))))
3277
3278 (defmacro gnus-summary-article-sparse-p (article)
3279   "Say whether this article is a sparse article or not."
3280   `(memq ,article gnus-newsgroup-sparse))
3281
3282 (defmacro gnus-summary-article-ancient-p (article)
3283   "Say whether this article is a sparse article or not."
3284   `(memq ,article gnus-newsgroup-ancient))
3285
3286 (defun gnus-article-children (number)
3287   "Return a list of all children to NUMBER."
3288   (let* ((data (gnus-data-find-list number))
3289          (level (gnus-data-level (car data)))
3290          children)
3291     (setq data (cdr data))
3292     (while (and data
3293                 (= (gnus-data-level (car data)) (1+ level)))
3294       (push (gnus-data-number (car data)) children)
3295       (setq data (cdr data)))
3296     children))
3297
3298 (defmacro gnus-summary-skip-intangible ()
3299   "If the current article is intangible, then jump to a different article."
3300   '(let ((to (get-text-property (point) 'gnus-intangible)))
3301      (and to (gnus-summary-goto-subject to))))
3302
3303 (defmacro gnus-summary-article-intangible-p ()
3304   "Say whether this article is intangible or not."
3305   '(get-text-property (point) 'gnus-intangible))
3306
3307 ;; Some summary mode macros.
3308
3309 (defmacro gnus-summary-article-number ()
3310   "The article number of the article on the current line.
3311 If there isn't an article number here, then we return the current
3312 article number."
3313   '(progn
3314      (gnus-summary-skip-intangible)
3315      (or (get-text-property (point) 'gnus-number)
3316          (gnus-summary-last-subject))))
3317
3318 (defmacro gnus-summary-article-header (&optional number)
3319   "Return the header of article NUMBER."
3320   `(gnus-data-header (gnus-data-find
3321                       ,(or number '(gnus-summary-article-number)))))
3322
3323 (defmacro gnus-summary-thread-level (&optional number)
3324   "Return the level of thread that starts with article NUMBER."
3325   `(if (and (eq gnus-summary-make-false-root 'dummy)
3326             (get-text-property (point) 'gnus-intangible))
3327        0
3328      (gnus-data-level (gnus-data-find
3329                        ,(or number '(gnus-summary-article-number))))))
3330
3331 (defmacro gnus-summary-article-mark (&optional number)
3332   "Return the mark of article NUMBER."
3333   `(gnus-data-mark (gnus-data-find
3334                     ,(or number '(gnus-summary-article-number)))))
3335
3336 (defmacro gnus-summary-article-pos (&optional number)
3337   "Return the position of the line of article NUMBER."
3338   `(gnus-data-pos (gnus-data-find
3339                    ,(or number '(gnus-summary-article-number)))))
3340
3341 (defalias 'gnus-summary-subject-string 'gnus-summary-article-subject)
3342 (defmacro gnus-summary-article-subject (&optional number)
3343   "Return current subject string or nil if nothing."
3344   `(let ((headers
3345           ,(if number
3346                `(gnus-data-header (assq ,number gnus-newsgroup-data))
3347              '(gnus-data-header (assq (gnus-summary-article-number)
3348                                       gnus-newsgroup-data)))))
3349      (and headers
3350           (vectorp headers)
3351           (mail-header-subject headers))))
3352
3353 (defmacro gnus-summary-article-score (&optional number)
3354   "Return current article score."
3355   `(or (cdr (assq ,(or number '(gnus-summary-article-number))
3356                   gnus-newsgroup-scored))
3357        gnus-summary-default-score 0))
3358
3359 (defun gnus-summary-article-children (&optional number)
3360   "Return a list of article numbers that are children of article NUMBER."
3361   (let* ((data (gnus-data-find-list (or number (gnus-summary-article-number))))
3362          (level (gnus-data-level (car data)))
3363          l children)
3364     (while (and (setq data (cdr data))
3365                 (> (setq l (gnus-data-level (car data))) level))
3366       (and (= (1+ level) l)
3367            (push (gnus-data-number (car data))
3368                  children)))
3369     (nreverse children)))
3370
3371 (defun gnus-summary-article-parent (&optional number)
3372   "Return the article number of the parent of article NUMBER."
3373   (let* ((data (gnus-data-find-list (or number (gnus-summary-article-number))
3374                                     (gnus-data-list t)))
3375          (level (gnus-data-level (car data))))
3376     (if (zerop level)
3377         ()                              ; This is a root.
3378       ;; We search until we find an article with a level less than
3379       ;; this one.  That function has to be the parent.
3380       (while (and (setq data (cdr data))
3381                   (not (< (gnus-data-level (car data)) level))))
3382       (and data (gnus-data-number (car data))))))
3383
3384 (defun gnus-unread-mark-p (mark)
3385   "Say whether MARK is the unread mark."
3386   (= mark gnus-unread-mark))
3387
3388 (defun gnus-read-mark-p (mark)
3389   "Say whether MARK is one of the marks that mark as read.
3390 This is all marks except unread, ticked, dormant, and expirable."
3391   (not (or (= mark gnus-unread-mark)
3392            (= mark gnus-ticked-mark)
3393            (= mark gnus-spam-mark)
3394            (= mark gnus-dormant-mark)
3395            (= mark gnus-expirable-mark))))
3396
3397 (defmacro gnus-article-mark (number)
3398   "Return the MARK of article NUMBER.
3399 This macro should only be used when computing the mark the \"first\"
3400 time; i.e., when generating the summary lines.  After that,
3401 `gnus-summary-article-mark' should be used to examine the
3402 marks of articles."
3403   `(cond
3404     ((memq ,number gnus-newsgroup-unsendable) gnus-unsendable-mark)
3405     ((memq ,number gnus-newsgroup-downloadable) gnus-downloadable-mark)
3406     ((memq ,number gnus-newsgroup-unreads) gnus-unread-mark)
3407     ((memq ,number gnus-newsgroup-marked) gnus-ticked-mark)
3408     ((memq ,number gnus-newsgroup-spam-marked) gnus-spam-mark)
3409     ((memq ,number gnus-newsgroup-dormant) gnus-dormant-mark)
3410     ((memq ,number gnus-newsgroup-expirable) gnus-expirable-mark)
3411     (t (or (cdr (assq ,number gnus-newsgroup-reads))
3412            gnus-ancient-mark))))
3413
3414 ;; Saving hidden threads.
3415
3416 (defmacro gnus-save-hidden-threads (&rest forms)
3417   "Save hidden threads, eval FORMS, and restore the hidden threads."
3418   (let ((config (make-symbol "config")))
3419     `(let ((,config (gnus-hidden-threads-configuration)))
3420        (unwind-protect
3421            (save-excursion
3422              ,@forms)
3423          (gnus-restore-hidden-threads-configuration ,config)))))
3424 (put 'gnus-save-hidden-threads 'lisp-indent-function 0)
3425 (put 'gnus-save-hidden-threads 'edebug-form-spec '(body))
3426
3427 (defun gnus-data-compute-positions ()
3428   "Compute the positions of all articles."
3429   (setq gnus-newsgroup-data-reverse nil)
3430   (let ((data gnus-newsgroup-data))
3431     (save-excursion
3432       (gnus-save-hidden-threads
3433         (gnus-summary-show-all-threads)
3434         (goto-char (point-min))
3435         (while data
3436           (while (get-text-property (point) 'gnus-intangible)
3437             (forward-line 1))
3438           (gnus-data-set-pos (car data) (+ (point) 3))
3439           (setq data (cdr data))
3440           (forward-line 1))))))
3441
3442 (defun gnus-hidden-threads-configuration ()
3443   "Return the current hidden threads configuration."
3444   (save-excursion
3445     (let (config)
3446       (goto-char (point-min))
3447       (while (not (eobp))
3448         (when (eq (get-char-property (point-at-eol) 'invisible) 'gnus-sum)
3449           (push (save-excursion (forward-line 0) (point)) config))
3450         (forward-line 1))
3451       config)))
3452
3453 (defun gnus-restore-hidden-threads-configuration (config)
3454   "Restore hidden threads configuration from CONFIG."
3455   (save-excursion
3456     (let (point (inhibit-read-only t))
3457       (while (setq point (pop config))
3458         (goto-char point)
3459         (gnus-summary-hide-thread)))))
3460
3461 ;; Various summary mode internalish functions.
3462
3463 (defun gnus-mouse-pick-article (e)
3464   (interactive "e")
3465   (mouse-set-point e)
3466   (gnus-summary-next-page nil t))
3467
3468 (defun gnus-summary-set-display-table ()
3469   "Change the display table.
3470 Odd characters have a tendency to mess
3471 up nicely formatted displays - we make all possible glyphs
3472 display only a single character."
3473
3474   ;; We start from the standard display table, if any.
3475   (let ((table (or (copy-sequence standard-display-table)
3476                    (make-display-table)))
3477         (i 32))
3478     ;; Nix out all the control chars...
3479     (while (>= (setq i (1- i)) 0)
3480       (gnus-put-display-table i [??] table))
3481    ;; ... but not newline and cr, of course.  (cr is necessary for the
3482     ;; selective display).
3483     (gnus-put-display-table ?\n nil table)
3484     (gnus-put-display-table ?\r nil table)
3485     ;; We keep TAB as well.
3486     (gnus-put-display-table ?\t nil table)
3487     ;; We nix out any glyphs 127 through 255, or 127 through 159 in
3488     ;; Emacs 23 (unicode), that are not set already.
3489     (let ((i (if (ignore-errors (= (make-char 'latin-iso8859-1 160) 160))
3490                  160
3491                256)))
3492       (while (>= (setq i (1- i)) 127)
3493         ;; Only modify if the entry is nil.
3494         (unless (gnus-get-display-table i table)
3495           (gnus-put-display-table i [??] table))))
3496     (setq buffer-display-table table)))
3497
3498 (defun gnus-summary-set-article-display-arrow (pos)
3499   "Update the overlay arrow to point to line at position POS."
3500   (when gnus-summary-display-arrow
3501     (make-local-variable 'overlay-arrow-position)
3502     (make-local-variable 'overlay-arrow-string)
3503     (save-excursion
3504       (goto-char pos)
3505       (beginning-of-line)
3506       (unless overlay-arrow-position
3507         (setq overlay-arrow-position (make-marker)))
3508       (setq overlay-arrow-string "=>"
3509             overlay-arrow-position (set-marker overlay-arrow-position
3510                                                (point)
3511                                                (current-buffer))))))
3512
3513 (defun gnus-summary-setup-buffer (group)
3514   "Initialize summary buffer.
3515 If the setup was successful, non-nil is returned."
3516   (let ((buffer (gnus-summary-buffer-name group))
3517         (dead-name (concat "*Dead Summary "
3518                            (gnus-group-decoded-name group) "*")))
3519     ;; If a dead summary buffer exists, we kill it.
3520     (when (gnus-buffer-live-p dead-name)
3521       (gnus-kill-buffer dead-name))
3522     (if (get-buffer buffer)
3523         (progn
3524           (set-buffer buffer)
3525           (setq gnus-summary-buffer (current-buffer))
3526           (not gnus-newsgroup-prepared))
3527       (set-buffer (gnus-get-buffer-create buffer))
3528       (setq gnus-summary-buffer (current-buffer))
3529       (gnus-summary-mode group)
3530       (when (gnus-group-quit-config group)
3531         (set (make-local-variable 'gnus-single-article-buffer) nil))
3532       (make-local-variable 'gnus-article-buffer)
3533       (make-local-variable 'gnus-article-current)
3534       (make-local-variable 'gnus-original-article-buffer)
3535       (setq gnus-newsgroup-name group)
3536       ;; Set any local variables in the group parameters.
3537       (gnus-summary-set-local-parameters gnus-newsgroup-name)
3538       t)))
3539
3540 (defun gnus-set-global-variables ()
3541   "Set the global equivalents of the buffer-local variables.
3542 They are set to the latest values they had.  These reflect the summary
3543 buffer that was in action when the last article was fetched."
3544   (when (derived-mode-p 'gnus-summary-mode)
3545     (setq gnus-summary-buffer (current-buffer))
3546     (let ((name gnus-newsgroup-name)
3547           (marked gnus-newsgroup-marked)
3548           (spam gnus-newsgroup-spam-marked)
3549           (unread gnus-newsgroup-unreads)
3550           (headers gnus-current-headers)
3551           (data gnus-newsgroup-data)
3552           (summary gnus-summary-buffer)
3553           (article-buffer gnus-article-buffer)
3554           (original gnus-original-article-buffer)
3555           (gac gnus-article-current)
3556           (reffed gnus-reffed-article-number)
3557           (score-file gnus-current-score-file)
3558           (default-charset gnus-newsgroup-charset)
3559           vlist)
3560       (let ((locals gnus-newsgroup-variables))
3561         (while locals
3562           (if (consp (car locals))
3563               (push (eval (caar locals)) vlist)
3564             (push (eval (car locals)) vlist))
3565           (setq locals (cdr locals)))
3566         (setq vlist (nreverse vlist)))
3567       (with-temp-buffer
3568         (setq gnus-newsgroup-name name
3569               gnus-newsgroup-marked marked
3570               gnus-newsgroup-spam-marked spam
3571               gnus-newsgroup-unreads unread
3572               gnus-current-headers headers
3573               gnus-newsgroup-data data
3574               gnus-article-current gac
3575               gnus-summary-buffer summary
3576               gnus-article-buffer article-buffer
3577               gnus-original-article-buffer original
3578               gnus-reffed-article-number reffed
3579               gnus-current-score-file score-file
3580               gnus-newsgroup-charset default-charset)
3581         (let ((locals gnus-newsgroup-variables))
3582           (while locals
3583             (if (consp (car locals))
3584                 (set (caar locals) (pop vlist))
3585               (set (car locals) (pop vlist)))
3586             (setq locals (cdr locals))))))))
3587
3588 (defun gnus-summary-article-unread-p (article)
3589   "Say whether ARTICLE is unread or not."
3590   (memq article gnus-newsgroup-unreads))
3591
3592 (defun gnus-summary-first-article-p (&optional article)
3593   "Return whether ARTICLE is the first article in the buffer."
3594   (if (not (setq article (or article (gnus-summary-article-number))))
3595       nil
3596     (eq article (caar gnus-newsgroup-data))))
3597
3598 (defun gnus-summary-last-article-p (&optional article)
3599   "Return whether ARTICLE is the last article in the buffer."
3600   (if (not (setq article (or article (gnus-summary-article-number))))
3601       ;; All non-existent numbers are the last article.  :-)
3602       t
3603     (not (cdr (gnus-data-find-list article)))))
3604
3605 (defun gnus-make-thread-indent-array (&optional n)
3606   (when (or n
3607             (progn (setq n 200) nil)
3608             (null gnus-thread-indent-array)
3609             (/= gnus-thread-indent-level gnus-thread-indent-array-level))
3610     (setq gnus-thread-indent-array (make-vector (1+ n) "")
3611           gnus-thread-indent-array-level gnus-thread-indent-level)
3612     (while (>= n 0)
3613       (aset gnus-thread-indent-array n
3614             (make-string (* n gnus-thread-indent-level) ? ))
3615       (setq n (1- n)))))
3616
3617 (defun gnus-update-summary-mark-positions ()
3618   "Compute where the summary marks are to go."
3619   (save-excursion
3620     (when (gnus-buffer-exists-p gnus-summary-buffer)
3621       (set-buffer gnus-summary-buffer))
3622     (let ((spec gnus-summary-line-format-spec)
3623           pos)
3624       (save-excursion
3625         (gnus-set-work-buffer)
3626         (let ((gnus-tmp-unread ?Z)
3627               (gnus-replied-mark ?Z)
3628               (gnus-score-below-mark ?Z)
3629               (gnus-score-over-mark ?Z)
3630               (gnus-undownloaded-mark ?Z)
3631               (gnus-summary-line-format-spec spec)
3632               (gnus-newsgroup-downloadable '(0))
3633               (header [0 "" "" "05 Apr 2001 23:33:09 +0400" "" "" 0 0 "" nil])
3634               case-fold-search ignores)
3635           ;; Here, all marks are bound to Z.
3636           (gnus-summary-insert-line header
3637                                     0 nil t gnus-tmp-unread t nil "" nil 1)
3638           (goto-char (point-min))
3639           ;; Memorize the positions of the same characters as dummy marks.
3640           (while (re-search-forward "[A-D]" nil t)
3641             (push (point) ignores))
3642           (erase-buffer)
3643           ;; We use A-D as dummy marks in order to know column positions
3644           ;; where marks should be inserted.
3645           (setq gnus-tmp-unread ?A
3646                 gnus-replied-mark ?B
3647                 gnus-score-below-mark ?C
3648                 gnus-score-over-mark ?C
3649                 gnus-undownloaded-mark ?D)
3650           (gnus-summary-insert-line header
3651                                     0 nil t gnus-tmp-unread t nil "" nil 1)
3652           ;; Ignore characters which aren't dummy marks.
3653           (dolist (p ignores)
3654             (delete-region (goto-char (1- p)) p)
3655             (insert ?Z))
3656           (goto-char (point-min))
3657           (setq pos (list (cons 'unread
3658                                 (and (search-forward "A" nil t)
3659                                      (- (point) (point-min) 1)))))
3660           (goto-char (point-min))
3661           (push (cons 'replied (and (search-forward "B" nil t)
3662                                     (- (point) (point-min) 1)))
3663                 pos)
3664           (goto-char (point-min))
3665           (push (cons 'score (and (search-forward "C" nil t)
3666                                   (- (point) (point-min) 1)))
3667                 pos)
3668           (goto-char (point-min))
3669           (push (cons 'download (and (search-forward "D" nil t)
3670                                      (- (point) (point-min) 1)))
3671                 pos)))
3672       (setq gnus-summary-mark-positions pos))))
3673
3674 (defun gnus-summary-insert-dummy-line (gnus-tmp-subject gnus-tmp-number)
3675   "Insert a dummy root in the summary buffer."
3676   (beginning-of-line)
3677   (gnus-add-text-properties
3678    (point) (progn (eval gnus-summary-dummy-line-format-spec) (point))
3679    (list 'gnus-number gnus-tmp-number 'gnus-intangible gnus-tmp-number)))
3680
3681 (defun gnus-summary-extract-address-component (from)
3682   (or (car (funcall gnus-extract-address-components from))
3683       from))
3684
3685 (defun gnus-summary-from-or-to-or-newsgroups (header gnus-tmp-from)
3686   (let ((mail-parse-charset gnus-newsgroup-charset)
3687         (ignored-from-addresses (gnus-ignored-from-addresses))
3688         ;; Is it really necessary to do this next part for each summary line?
3689         ;; Luckily, doesn't seem to slow things down much.
3690         (mail-parse-ignored-charsets
3691          (with-current-buffer gnus-summary-buffer
3692            gnus-newsgroup-ignored-charsets)))
3693     (or
3694      (and ignored-from-addresses
3695           (string-match ignored-from-addresses gnus-tmp-from)
3696           (let ((extra-headers (mail-header-extra header))
3697                 to
3698                 newsgroups)
3699             (cond
3700              ((setq to (cdr (assq 'To extra-headers)))
3701               (concat gnus-summary-to-prefix
3702                       (inline
3703                         (gnus-summary-extract-address-component
3704                          (funcall gnus-decode-encoded-address-function to)))))
3705              ((setq newsgroups
3706                     (or
3707                      (cdr (assq 'Newsgroups extra-headers))
3708                      (and
3709                       (memq 'Newsgroups gnus-extra-headers)
3710                       (eq (car (gnus-find-method-for-group
3711                                 gnus-newsgroup-name)) 'nntp)
3712                       (gnus-group-real-name gnus-newsgroup-name))))
3713               (concat gnus-summary-newsgroup-prefix newsgroups)))))
3714      (gnus-string-mark-left-to-right
3715       (inline
3716         (gnus-summary-extract-address-component gnus-tmp-from))))))
3717
3718 (defun gnus-summary-insert-line (gnus-tmp-header
3719                                  gnus-tmp-level gnus-tmp-current
3720                                  undownloaded gnus-tmp-unread gnus-tmp-replied
3721                                  gnus-tmp-expirable gnus-tmp-subject-or-nil
3722                                  &optional gnus-tmp-dummy gnus-tmp-score
3723                                  gnus-tmp-process)
3724   (if (>= gnus-tmp-level (length gnus-thread-indent-array))
3725       (gnus-make-thread-indent-array (max (* 2 (length gnus-thread-indent-array))
3726                                           gnus-tmp-level)))
3727   (let* ((gnus-tmp-indentation (aref gnus-thread-indent-array gnus-tmp-level))
3728          (gnus-tmp-lines (mail-header-lines gnus-tmp-header))
3729          (gnus-tmp-score (or gnus-tmp-score gnus-summary-default-score 0))
3730          (gnus-tmp-score-char
3731           (if (or (null gnus-summary-default-score)
3732                   (<= (abs (- gnus-tmp-score gnus-summary-default-score))
3733                       gnus-summary-zcore-fuzz))
3734               ?                         ;Whitespace
3735             (if (< gnus-tmp-score gnus-summary-default-score)
3736                 gnus-score-below-mark gnus-score-over-mark)))
3737          (gnus-tmp-number (mail-header-number gnus-tmp-header))
3738          (gnus-tmp-replied
3739           (cond (gnus-tmp-process gnus-process-mark)
3740                 ((memq gnus-tmp-current gnus-newsgroup-cached)
3741                  gnus-cached-mark)
3742                 (gnus-tmp-replied gnus-replied-mark)
3743                 ((memq gnus-tmp-current gnus-newsgroup-forwarded)
3744                  gnus-forwarded-mark)
3745                 ((memq gnus-tmp-current gnus-newsgroup-saved)
3746                  gnus-saved-mark)
3747                 ((memq gnus-tmp-number gnus-newsgroup-unseen)
3748                  gnus-unseen-mark)
3749                 (t gnus-no-mark)))
3750          (gnus-tmp-downloaded
3751           (cond (undownloaded
3752                  gnus-undownloaded-mark)
3753                 (gnus-newsgroup-agentized
3754                  gnus-downloaded-mark)
3755                 (t
3756                  gnus-no-mark)))
3757          (gnus-tmp-from (mail-header-from gnus-tmp-header))
3758          (gnus-tmp-name
3759           (cond
3760            ((string-match "<[^>]+> *$" gnus-tmp-from)
3761             (let ((beg (match-beginning 0)))
3762               (or (and (string-match "^\".+\"" gnus-tmp-from)
3763                        (substring gnus-tmp-from 1 (1- (match-end 0))))
3764                   (substring gnus-tmp-from 0 beg))))
3765            ((string-match "(.+)" gnus-tmp-from)
3766             (substring gnus-tmp-from
3767                        (1+ (match-beginning 0)) (1- (match-end 0))))
3768            (t gnus-tmp-from)))
3769          (gnus-tmp-subject (mail-header-subject gnus-tmp-header))
3770          (gnus-tmp-opening-bracket (if gnus-tmp-dummy ?\< ?\[))
3771          (gnus-tmp-closing-bracket (if gnus-tmp-dummy ?\> ?\]))
3772          (inhibit-read-only t))
3773     (when (string= gnus-tmp-name "")
3774       (setq gnus-tmp-name gnus-tmp-from))
3775     (unless (numberp gnus-tmp-lines)
3776       (setq gnus-tmp-lines -1))
3777     (if (= gnus-tmp-lines -1)
3778         (setq gnus-tmp-lines "?")
3779       (setq gnus-tmp-lines (number-to-string gnus-tmp-lines)))
3780     (condition-case ()
3781         (gnus-put-text-property
3782          (point)
3783          (progn (eval gnus-summary-line-format-spec) (point))
3784          'gnus-number gnus-tmp-number)
3785       (error (gnus-message 5 "Error updating the summary line")))
3786     (when (gnus-visual-p 'summary-highlight 'highlight)
3787       (forward-line -1)
3788       (gnus-summary-highlight-line)
3789       (gnus-run-hooks 'gnus-summary-update-hook)
3790       (forward-line 1))))
3791
3792 (defun gnus-summary-update-line (&optional dont-update)
3793   "Update summary line after change."
3794   (when (and gnus-summary-default-score
3795              (not gnus-summary-inhibit-highlight))
3796     (let* ((gnus-summary-inhibit-highlight t) ; Prevent recursion.
3797            (article (gnus-summary-article-number))
3798            (score (gnus-summary-article-score article)))
3799       (unless dont-update
3800         (if (and gnus-summary-mark-below
3801                  (< (gnus-summary-article-score)
3802                     gnus-summary-mark-below))
3803             ;; This article has a low score, so we mark it as read.
3804             (when (memq article gnus-newsgroup-unreads)
3805               (gnus-summary-mark-article-as-read gnus-low-score-mark))
3806           (when (eq (gnus-summary-article-mark) gnus-low-score-mark)
3807             ;; This article was previously marked as read on account
3808             ;; of a low score, but now it has risen, so we mark it as
3809             ;; unread.
3810             (gnus-summary-mark-article-as-unread gnus-unread-mark)))
3811         (gnus-summary-update-mark
3812          (if (or (null gnus-summary-default-score)
3813                  (<= (abs (- score gnus-summary-default-score))
3814                      gnus-summary-zcore-fuzz))
3815              ?                          ;Whitespace
3816            (if (< score gnus-summary-default-score)
3817                gnus-score-below-mark gnus-score-over-mark))
3818          'score))
3819       ;; Do visual highlighting.
3820       (when (gnus-visual-p 'summary-highlight 'highlight)
3821         (gnus-summary-highlight-line)
3822         (gnus-run-hooks 'gnus-summary-update-hook)))))
3823
3824 (defvar gnus-tmp-new-adopts nil)
3825
3826 (defun gnus-summary-number-of-articles-in-thread (thread &optional level char)
3827   "Return the number of articles in THREAD.
3828 This may be 0 in some cases -- if none of the articles in
3829 the thread are to be displayed."
3830   (let* ((number
3831          ;; Fix by Luc Van Eycken <Luc.VanEycken@esat.kuleuven.ac.be>.
3832           (cond
3833            ((not (listp thread))
3834             1)
3835            ((and (consp thread) (cdr thread))
3836             (apply
3837              '+ 1 (mapcar
3838                    'gnus-summary-number-of-articles-in-thread (cdr thread))))
3839            ((null thread)
3840             1)
3841            ((memq (mail-header-number (car thread)) gnus-newsgroup-limit)
3842             1)
3843            (t 0))))
3844     (when (and level (zerop level) gnus-tmp-new-adopts)
3845       (incf number
3846             (apply '+ (mapcar
3847                        'gnus-summary-number-of-articles-in-thread
3848                        gnus-tmp-new-adopts))))
3849     (if char
3850         (if (> number 1) gnus-not-empty-thread-mark
3851           gnus-empty-thread-mark)
3852       number)))
3853
3854 (defsubst gnus-summary-line-message-size (head)
3855   "Return pretty-printed version of message size.
3856 This function is intended to be used in
3857 `gnus-summary-line-format-alist'."
3858   (let ((c (or (mail-header-chars head) -1)))
3859     (cond ((< c 0) "n/a")               ; chars not available
3860           ((< c (* 1000 10)) (format "%1.1fk" (/ c 1024.0)))
3861           ((< c (* 1000 100)) (format "%dk" (/ c 1024.0)))
3862           ((< c (* 1000 10000)) (format "%1.1fM" (/ c (* 1024.0 1024))))
3863           (t (format "%dM" (/ c (* 1024.0 1024)))))))
3864
3865 (defcustom gnus-user-date-format-alist
3866   '(((gnus-seconds-today) . "Today, %H:%M")
3867     ((+ 86400 (gnus-seconds-today)) . "Yesterday, %H:%M")
3868     (604800 . "%A %H:%M")               ; That's one week
3869     ((gnus-seconds-month) . "%A %d")
3870     ((gnus-seconds-year) . "%B %d")
3871     (t . "%b %d %Y"))                   ; This one is used when no other
3872                                         ; does match
3873   "Specifies date format depending on age of article.
3874 This is an alist of items (AGE . FORMAT).  AGE can be a number (of
3875 seconds) or a Lisp expression evaluating to a number.  When the age of
3876 the article is less than this number, then use `format-time-string'
3877 with the corresponding FORMAT for displaying the date of the article.
3878 If AGE is not a number or a Lisp expression evaluating to a
3879 non-number, then the corresponding FORMAT is used as a default value.
3880
3881 Note that the list is processed from the beginning, so it should be
3882 sorted by ascending AGE.  Also note that items following the first
3883 non-number AGE will be ignored.
3884
3885 You can use the functions `gnus-seconds-today', `gnus-seconds-month'
3886 and `gnus-seconds-year' in the AGE spec.  They return the number of
3887 seconds passed since the start of today, of this month, of this year,
3888 respectively."
3889   :version "24.1"
3890   :group 'gnus-summary-format
3891   :type '(alist :key-type sexp :value-type string))
3892
3893 (defun gnus-user-date (messy-date)
3894   "Format the messy-date according to `gnus-user-date-format-alist'.
3895 Returns \"  ?  \" if there's bad input or if another error occurs.
3896 Input should look like this: \"Sun, 14 Oct 2001 13:34:39 +0200\"."
3897   (condition-case ()
3898       (let* ((messy-date (gnus-float-time (gnus-date-get-time messy-date)))
3899              (now (gnus-float-time))
3900              ;;If we don't find something suitable we'll use this one
3901              (my-format "%b %d '%y"))
3902         (let* ((difference (- now messy-date))
3903                (templist gnus-user-date-format-alist)
3904                (top (eval (caar templist))))
3905           (while (if (numberp top) (< top difference) (not top))
3906             (progn
3907               (setq templist (cdr templist))
3908               (setq top (eval (caar templist)))))
3909           (if (stringp (cdr (car templist)))
3910               (setq my-format (cdr (car templist)))))
3911         (format-time-string (eval my-format) (seconds-to-time messy-date)))
3912     (error "  ?   ")))
3913
3914 (defun gnus-summary-set-local-parameters (group)
3915   "Go through the local params of GROUP and set all variable specs in that list."
3916   (let ((vars '(quit-config active)))   ; Ignore things that aren't
3917                                         ; really variables.
3918     (dolist (elem (gnus-group-find-parameter group))
3919       (and (consp elem)                 ; Has to be a cons.
3920            (consp (cdr elem))           ; The cdr has to be a list.
3921            (symbolp (car elem))         ; Has to be a symbol in there.
3922            (not (memq (car elem) vars))
3923            (ignore-errors
3924              (push (car elem) vars)
3925              ;; Variables like `gnus-show-threads' that are globally
3926              ;; bound, if used as group parameters, need to get to be
3927              ;; buffer-local, whereas just parameters like `gcc-self',
3928              ;; `timestamp', etc. should not be bound as variables.
3929              (if (boundp (car elem))
3930                  (set (make-local-variable (car elem)) (eval (nth 1 elem)))
3931                (eval (nth 1 elem))))))))
3932
3933 (defun gnus-summary-read-group (group &optional show-all no-article
3934                                       kill-buffer no-display backward
3935                                       select-articles)
3936   "Start reading news in newsgroup GROUP.
3937 If SHOW-ALL is non-nil, already read articles are also listed.
3938 If NO-ARTICLE is non-nil, no article is selected initially.
3939 If NO-DISPLAY, don't generate the summary buffer contents.
3940 If KILL-BUFFER, it should be a buffer that's killed once the new
3941 summary buffer has been generated.
3942 If BACKWARD, move point to the previous group in the group buffer
3943 If SELECT-ARTICLES, only select those articles from GROUP."
3944   (let (result)
3945     (while (and group
3946                 (null (setq result
3947                             (let ((gnus-auto-select-next nil))
3948                               (or (gnus-summary-read-group-1
3949                                    group show-all no-article
3950                                    kill-buffer no-display
3951                                    select-articles)
3952                                   (setq show-all nil
3953                                         select-articles nil)))))
3954                 (eq gnus-auto-select-next 'quietly))
3955       (set-buffer gnus-group-buffer)
3956       ;; The entry function called above goes to the next
3957       ;; group automatically, so we go two groups back
3958       ;; if we are searching for the previous group.
3959       (when backward
3960         (gnus-group-prev-unread-group 2))
3961       (if (not (equal group (gnus-group-group-name)))
3962           (setq group (gnus-group-group-name))
3963         (setq group nil)))
3964     result))
3965
3966 (defun gnus-summary-read-group-1 (group show-all no-article
3967                                         kill-buffer no-display
3968                                         &optional select-articles)
3969   ;; Killed foreign groups can't be entered.
3970   ;;  (when (and (not (gnus-group-native-p group))
3971   ;;         (not (gnus-gethash group gnus-newsrc-hashtb)))
3972   ;;    (error "Dead non-native groups can't be entered"))
3973   (gnus-message 7 "Retrieving newsgroup: %s..."
3974                 (gnus-group-decoded-name group))
3975   (let* ((new-group (gnus-summary-setup-buffer group))
3976          (quit-config (gnus-group-quit-config group))
3977          (did-select (and new-group (gnus-select-newsgroup
3978                                      group show-all select-articles))))
3979     (cond
3980      ;; This summary buffer exists already, so we just select it.
3981      ((not new-group)
3982       (gnus-set-global-variables)
3983       (when kill-buffer
3984         (gnus-kill-or-deaden-summary kill-buffer))
3985       (gnus-configure-windows 'summary 'force)
3986       (gnus-set-mode-line 'summary)
3987       (gnus-summary-position-point)
3988       (message "")
3989       t)
3990      ;; We couldn't select this group.
3991      ((null did-select)
3992       (when (and (derived-mode-p 'gnus-summary-mode)
3993                  (not (equal (current-buffer) kill-buffer)))
3994         (kill-buffer (current-buffer))
3995         (if (not quit-config)
3996             (progn
3997               ;; Update the info -- marks might need to be removed,
3998               ;; for instance.
3999               (gnus-summary-update-info)
4000               (set-buffer gnus-group-buffer)
4001               (gnus-group-jump-to-group group)
4002               (gnus-group-next-unread-group 1))
4003           (gnus-handle-ephemeral-exit quit-config)))
4004       (if (null (gnus-list-of-unread-articles group))
4005           (gnus-message 3 "Group %s contains no messages" group)
4006         (gnus-message 3 "Can't select group"))
4007       nil)
4008      ;; The user did a `C-g' while prompting for number of articles,
4009      ;; so we exit this group.
4010      ((eq did-select 'quit)
4011       (and (derived-mode-p 'gnus-summary-mode)
4012            (not (equal (current-buffer) kill-buffer))
4013            (kill-buffer (current-buffer)))
4014       (when kill-buffer
4015         (gnus-kill-or-deaden-summary kill-buffer))
4016       (if (not quit-config)
4017           (progn
4018             (set-buffer gnus-group-buffer)
4019             (gnus-group-jump-to-group group)
4020             (gnus-configure-windows 'group 'force))
4021         (gnus-handle-ephemeral-exit quit-config))
4022       ;; Finally signal the quit.
4023       (signal 'quit nil))
4024      ;; The group was successfully selected.
4025      (t
4026       (gnus-set-global-variables)
4027       (when (boundp 'spam-install-hooks)
4028         (spam-initialize))
4029       ;; Save the active value in effect when the group was entered.
4030       (setq gnus-newsgroup-active
4031             (gnus-copy-sequence
4032              (gnus-active gnus-newsgroup-name)))
4033       (setq gnus-newsgroup-highest (cdr gnus-newsgroup-active))
4034       ;; You can change the summary buffer in some way with this hook.
4035       (gnus-run-hooks 'gnus-select-group-hook)
4036       (when (memq 'summary (gnus-update-format-specifications
4037                             nil 'summary 'summary-mode 'summary-dummy))
4038         ;; The format specification for the summary line was updated,
4039         ;; so we need to update the mark positions as well.
4040         (gnus-update-summary-mark-positions))
4041       ;; Do score processing.
4042       (when gnus-use-scoring
4043         (gnus-possibly-score-headers))
4044       ;; Check whether to fill in the gaps in the threads.
4045       (when gnus-build-sparse-threads
4046         (gnus-build-sparse-threads))
4047       ;; Find the initial limit.
4048       (if show-all
4049           (let ((gnus-newsgroup-dormant nil))
4050             (gnus-summary-initial-limit show-all))
4051         (gnus-summary-initial-limit show-all))
4052       ;; Generate the summary buffer.
4053       (unless no-display
4054         (gnus-summary-prepare))
4055       (when gnus-use-trees
4056         (gnus-tree-open)
4057         (setq gnus-summary-highlight-line-function
4058               'gnus-tree-highlight-article))
4059       ;; If the summary buffer is empty, but there are some low-scored
4060       ;; articles or some excluded dormants, we include these in the
4061       ;; buffer.
4062       (when (and (zerop (buffer-size))
4063                  (not no-display))
4064         (cond (gnus-newsgroup-dormant
4065                (gnus-summary-limit-include-dormant))
4066               ((and gnus-newsgroup-scored show-all)
4067                (gnus-summary-limit-include-expunged t))))
4068       ;; Function `gnus-apply-kill-file' must be called in this hook.
4069       (gnus-run-hooks 'gnus-apply-kill-hook)
4070       (if (and (zerop (buffer-size))
4071                (not no-display))
4072           (progn
4073             ;; This newsgroup is empty.
4074             (gnus-summary-catchup-and-exit nil t)
4075             (gnus-message 6 "No unread news")
4076             (when kill-buffer
4077               (gnus-kill-or-deaden-summary kill-buffer))
4078             ;; Return nil from this function.
4079             nil)
4080         ;; Hide conversation thread subtrees.  We cannot do this in
4081         ;; gnus-summary-prepare-hook since kill processing may not
4082         ;; work with hidden articles.
4083         (gnus-summary-maybe-hide-threads)
4084         (gnus-configure-windows 'summary)
4085         (when kill-buffer
4086           (gnus-kill-or-deaden-summary kill-buffer))
4087         (gnus-summary-auto-select-subject)
4088         ;; Show first unread article if requested.
4089         (if (and (not no-article)
4090                  (not no-display)
4091                  gnus-newsgroup-unreads
4092                  gnus-auto-select-first)
4093             (progn
4094               (let ((art (gnus-summary-article-number)))
4095                 (when (and art
4096                            gnus-plugged
4097                            (not (memq art gnus-newsgroup-undownloaded))
4098                            (not (memq art gnus-newsgroup-downloadable)))
4099                   (gnus-summary-goto-article art))))
4100           ;; Don't select any articles.
4101           (gnus-summary-position-point)
4102           (gnus-configure-windows 'summary 'force)
4103           (gnus-set-mode-line 'summary))
4104         (when (and gnus-auto-center-group
4105                    (get-buffer-window gnus-group-buffer t))
4106           ;; Gotta use windows, because recenter does weird stuff if
4107           ;; the current buffer ain't the displayed window.
4108           (let ((owin (selected-window)))
4109             (select-window (get-buffer-window gnus-group-buffer t))
4110             (when (gnus-group-goto-group group)
4111               (recenter))
4112             (select-window owin)))
4113         ;; Mark this buffer as "prepared".
4114         (setq gnus-newsgroup-prepared t)
4115         (gnus-run-hooks 'gnus-summary-prepared-hook)
4116         (unless (gnus-ephemeral-group-p group)
4117           (gnus-group-update-group group nil t))
4118         t)))))
4119
4120 (defun gnus-summary-auto-select-subject ()
4121   "Select the subject line on initial group entry."
4122   (goto-char (point-min))
4123   (cond
4124    ((eq gnus-auto-select-subject 'best)
4125     (gnus-summary-best-unread-subject))
4126    ((eq gnus-auto-select-subject 'unread)
4127     (gnus-summary-first-unread-subject))
4128    ((eq gnus-auto-select-subject 'unseen)
4129     (gnus-summary-first-unseen-subject))
4130    ((eq gnus-auto-select-subject 'unseen-or-unread)
4131     (gnus-summary-first-unseen-or-unread-subject))
4132    ((eq gnus-auto-select-subject 'first)
4133     ;; Do nothing.
4134     )
4135    ((functionp gnus-auto-select-subject)
4136     (funcall gnus-auto-select-subject))))
4137
4138 (defun gnus-summary-prepare ()
4139   "Generate the summary buffer."
4140   (interactive)
4141   (let ((inhibit-read-only t))
4142     (erase-buffer)
4143     (setq gnus-newsgroup-data nil
4144           gnus-newsgroup-data-reverse nil)
4145     (gnus-run-hooks 'gnus-summary-generate-hook)
4146     ;; Generate the buffer, either with threads or without.
4147     (when gnus-newsgroup-headers
4148       (gnus-summary-prepare-threads
4149        (if gnus-show-threads
4150            (gnus-sort-gathered-threads
4151             (funcall gnus-summary-thread-gathering-function
4152                      (gnus-sort-threads
4153                       (gnus-cut-threads (gnus-make-threads)))))
4154          ;; Unthreaded display.
4155          (gnus-sort-articles gnus-newsgroup-headers))))
4156     (setq gnus-newsgroup-data (nreverse gnus-newsgroup-data))
4157     ;; Call hooks for modifying summary buffer.
4158     (goto-char (point-min))
4159     (gnus-run-hooks 'gnus-summary-prepare-hook)))
4160
4161 (defsubst gnus-general-simplify-subject (subject)
4162   "Simplify subject by the same rules as `gnus-gather-threads-by-subject'."
4163   (setq subject
4164         (cond
4165          ;; Truncate the subject.
4166          (gnus-simplify-subject-functions
4167           (gnus-map-function gnus-simplify-subject-functions subject))
4168          ((numberp gnus-summary-gather-subject-limit)
4169           (setq subject (gnus-simplify-subject-re subject))
4170           (if (> (length subject) gnus-summary-gather-subject-limit)
4171               (substring subject 0 gnus-summary-gather-subject-limit)
4172             subject))
4173          ;; Fuzzily simplify it.
4174          ((eq 'fuzzy gnus-summary-gather-subject-limit)
4175           (gnus-simplify-subject-fuzzy subject))
4176          ;; Just remove the leading "Re:".
4177          (t
4178           (gnus-simplify-subject-re subject))))
4179
4180   (if (and gnus-summary-gather-exclude-subject
4181            (string-match gnus-summary-gather-exclude-subject subject))
4182       nil                         ; This article shouldn't be gathered
4183     subject))
4184
4185 (defun gnus-summary-simplify-subject-query ()
4186   "Query where the respool algorithm would put this article."
4187   (interactive)
4188   (gnus-summary-select-article)
4189   (message "%s" (gnus-general-simplify-subject (gnus-summary-article-subject))))
4190
4191 (defun gnus-gather-threads-by-subject (threads)
4192   "Gather threads by looking at Subject headers."
4193   (if (not gnus-summary-make-false-root)
4194       threads
4195     (let ((hashtb (gnus-make-hashtable 1024))
4196           (prev threads)
4197           (result threads)
4198           subject hthread whole-subject)
4199       (while threads
4200         (setq subject (gnus-general-simplify-subject
4201                        (setq whole-subject (mail-header-subject
4202                                             (caar threads)))))
4203         (when subject
4204           (if (setq hthread (gnus-gethash subject hashtb))
4205               (progn
4206                 ;; We enter a dummy root into the thread, if we
4207                 ;; haven't done that already.
4208                 (unless (stringp (caar hthread))
4209                   (setcar hthread (list whole-subject (car hthread))))
4210                 ;; We add this new gathered thread to this gathered
4211                 ;; thread.
4212                 (setcdr (car hthread)
4213                         (nconc (cdar hthread) (list (car threads))))
4214                 ;; Remove it from the list of threads.
4215                 (setcdr prev (cdr threads))
4216                 (setq threads prev))
4217             ;; Enter this thread into the hash table.
4218             (gnus-sethash subject
4219                           (if gnus-summary-make-false-root-always
4220                               (progn
4221                                 ;; If you want a dummy root above all
4222                                 ;; threads...
4223                                 (setcar threads (list whole-subject
4224                                                       (car threads)))
4225                                 threads)
4226                             threads)
4227                           hashtb)))
4228         (setq prev threads)
4229         (setq threads (cdr threads)))
4230       result)))
4231
4232 (defun gnus-gather-threads-by-references (threads)
4233   "Gather threads by looking at References headers."
4234   (let ((idhashtb (gnus-make-hashtable 1024))
4235         (thhashtb (gnus-make-hashtable 1024))
4236         (prev threads)
4237         (result threads)
4238         ids references id gthread gid entered ref)
4239     (while threads
4240       (when (setq references (mail-header-references (caar threads)))
4241         (setq id (mail-header-id (caar threads))
4242               ids (inline (gnus-split-references references))
4243               entered nil)
4244         (while (setq ref (pop ids))
4245           (setq ids (delete ref ids))
4246           (if (not (setq gid (gnus-gethash ref idhashtb)))
4247               (progn
4248                 (gnus-sethash ref id idhashtb)
4249                 (gnus-sethash id threads thhashtb))
4250             (setq gthread (gnus-gethash gid thhashtb))
4251             (unless entered
4252               ;; We enter a dummy root into the thread, if we
4253               ;; haven't done that already.
4254               (unless (stringp (caar gthread))
4255                 (setcar gthread (list (mail-header-subject (caar gthread))
4256                                       (car gthread))))
4257               ;; We add this new gathered thread to this gathered
4258               ;; thread.
4259               (setcdr (car gthread)
4260                       (nconc (cdar gthread) (list (car threads)))))
4261             ;; Add it into the thread hash table.
4262             (gnus-sethash id gthread thhashtb)
4263             (setq entered t)
4264             ;; Remove it from the list of threads.
4265             (setcdr prev (cdr threads))
4266             (setq threads prev))))
4267       (setq prev threads)
4268       (setq threads (cdr threads)))
4269     result))
4270
4271 (defun gnus-sort-gathered-threads (threads)
4272   "Sort subthreads inside each gathered thread by `gnus-sort-gathered-threads-function'."
4273   (let ((result threads))
4274     (while threads
4275       (when (stringp (caar threads))
4276         (setcdr (car threads)
4277                 (sort (cdar threads) gnus-sort-gathered-threads-function)))
4278       (setq threads (cdr threads)))
4279     result))
4280
4281 (defun gnus-thread-loop-p (root thread)
4282   "Say whether ROOT is in THREAD."
4283   (let ((stack (list thread))
4284         (infloop 0)
4285         th)
4286     (while (setq thread (pop stack))
4287       (setq th (cdr thread))
4288       (while (and th
4289                   (not (eq (caar th) root)))
4290         (pop th))
4291       (if th
4292           ;; We have found a loop.
4293           (let (ref-dep)
4294             (setcdr thread (delq (car th) (cdr thread)))
4295             (if (boundp (setq ref-dep (intern "none"
4296                                               gnus-newsgroup-dependencies)))
4297                 (setcdr (symbol-value ref-dep)
4298                         (nconc (cdr (symbol-value ref-dep))
4299                                (list (car th))))
4300               (set ref-dep (list nil (car th))))
4301             (setq infloop 1
4302                   stack nil))
4303         ;; Push all the subthreads onto the stack.
4304         (push (cdr thread) stack)))
4305     infloop))
4306
4307 (defun gnus-make-threads ()
4308   "Go through the dependency hashtb and find the roots.  Return all threads."
4309   (let (threads)
4310     (while (catch 'infloop
4311              (mapatoms
4312               (lambda (refs)
4313                 ;; Deal with self-referencing References loops.
4314                 (when (and (car (symbol-value refs))
4315                            (not (zerop
4316                                  (apply
4317                                   '+
4318                                   (mapcar
4319                                    (lambda (thread)
4320                                      (gnus-thread-loop-p
4321                                       (car (symbol-value refs)) thread))
4322                                    (cdr (symbol-value refs)))))))
4323                   (setq threads nil)
4324                   (throw 'infloop t))
4325                 (unless (car (symbol-value refs))
4326                   ;; These threads do not refer back to any other
4327                   ;; articles, so they're roots.
4328                   (setq threads (append (cdr (symbol-value refs)) threads))))
4329               gnus-newsgroup-dependencies)))
4330     threads))
4331
4332 ;; Build the thread tree.
4333 (defsubst gnus-dependencies-add-header (header dependencies force-new)
4334   "Enter HEADER into the DEPENDENCIES table if it is not already there.
4335
4336 If FORCE-NEW is not nil, enter HEADER into the DEPENDENCIES table even
4337 if it was already present.
4338
4339 If `gnus-summary-ignore-duplicates' is nil then duplicate Message-IDs
4340 will not be entered in the DEPENDENCIES table.  Otherwise duplicate
4341 Message-IDs will be renamed to a unique Message-ID before being
4342 entered.
4343
4344 Returns HEADER if it was entered in the DEPENDENCIES.  Returns nil otherwise."
4345   (let* ((id (mail-header-id header))
4346          (id-dep (and id (intern id dependencies)))
4347          parent-id ref ref-dep ref-header replaced)
4348     ;; Enter this `header' in the `dependencies' table.
4349     (cond
4350      ((not id-dep)
4351       (setq header nil))
4352      ;; The first two cases do the normal part: enter a new `header'
4353      ;; in the `dependencies' table.
4354      ((not (boundp id-dep))
4355       (set id-dep (list header)))
4356      ((null (car (symbol-value id-dep)))
4357       (setcar (symbol-value id-dep) header))
4358
4359      ;; From here the `header' was already present in the
4360      ;; `dependencies' table.
4361      (force-new
4362       ;; Overrides an existing entry;
4363       ;; just set the header part of the entry.
4364       (setcar (symbol-value id-dep) header)
4365       (setq replaced t))
4366
4367      ;; Renames the existing `header' to a unique Message-ID.
4368      ((not gnus-summary-ignore-duplicates)
4369       ;; An article with this Message-ID has already been seen.
4370       ;; We rename the Message-ID.
4371       (set (setq id-dep (intern (setq id (nnmail-message-id)) dependencies))
4372            (list header))
4373       (mail-header-set-id header id))
4374
4375      ;; The last case ignores an existing entry, except it adds any
4376      ;; additional Xrefs (in case the two articles came from different
4377      ;; servers.
4378      ;; Also sets `header' to `nil' meaning that the `dependencies'
4379      ;; table was *not* modified.
4380      (t
4381       (mail-header-set-xref
4382        (car (symbol-value id-dep))
4383        (concat (or (mail-header-xref (car (symbol-value id-dep)))
4384                    "")
4385                (or (mail-header-xref header) "")))
4386       (setq header nil)))
4387
4388     (when (and header (not replaced))
4389       ;; First check that we are not creating a References loop.
4390       (setq parent-id (gnus-parent-id (mail-header-references header)))
4391       (setq ref parent-id)
4392       (while (and ref
4393                   (setq ref-dep (intern-soft ref dependencies))
4394                   (boundp ref-dep)
4395                   (setq ref-header (car (symbol-value ref-dep))))
4396         (if (string= id ref)
4397             ;; Yuk!  This is a reference loop.  Make the article be a
4398             ;; root article.
4399             (progn
4400               (mail-header-set-references (car (symbol-value id-dep)) "none")
4401               (setq ref nil)
4402               (setq parent-id nil))
4403           (setq ref (gnus-parent-id (mail-header-references ref-header)))))
4404       (setq ref-dep (intern (or parent-id "none") dependencies))
4405       (if (boundp ref-dep)
4406           (setcdr (symbol-value ref-dep)
4407                   (nconc (cdr (symbol-value ref-dep))
4408                          (list (symbol-value id-dep))))
4409         (set ref-dep (list nil (symbol-value id-dep)))))
4410     header))
4411
4412 (defun gnus-extract-message-id-from-in-reply-to (string)
4413   (if (string-match "<[^>]+>" string)
4414       (substring string (match-beginning 0) (match-end 0))
4415     nil))
4416
4417 (defun gnus-build-sparse-threads ()
4418   (let ((headers gnus-newsgroup-headers)
4419         (mail-parse-charset gnus-newsgroup-charset)
4420         (gnus-summary-ignore-duplicates t)
4421         header references generation relations
4422         subject child end new-child date)
4423     ;; First we create an alist of generations/relations, where
4424     ;; generations is how much we trust the relation, and the relation
4425     ;; is parent/child.
4426     (gnus-message 7 "Making sparse threads...")
4427     (save-excursion
4428       (nnheader-set-temp-buffer " *gnus sparse threads*")
4429       (while (setq header (pop headers))
4430         (when (and (setq references (mail-header-references header))
4431                    (not (string= references "")))
4432           (insert references)
4433           (setq child (mail-header-id header)
4434                 subject (mail-header-subject header)
4435                 date (mail-header-date header)
4436                 generation 0)
4437           (while (search-backward ">" nil t)
4438             (setq end (1+ (point)))
4439             (when (search-backward "<" nil t)
4440               (setq new-child (buffer-substring (point) end))
4441               (push (list (incf generation)
4442                           child (setq child new-child)
4443                           subject date)
4444                     relations)))
4445           (when child
4446             (push (list (1+ generation) child nil subject) relations))
4447           (erase-buffer)))
4448       (kill-buffer (current-buffer)))
4449     ;; Sort over trustworthiness.
4450     (dolist (relation (sort relations 'car-less-than-car))
4451       (when (gnus-dependencies-add-header
4452              (make-full-mail-header
4453               gnus-reffed-article-number
4454               (nth 3 relation) "" (or (nth 4 relation) "")
4455               (nth 1 relation)
4456               (or (nth 2 relation) "") 0 0 "")
4457              gnus-newsgroup-dependencies nil)
4458         (push gnus-reffed-article-number gnus-newsgroup-limit)
4459         (push gnus-reffed-article-number gnus-newsgroup-sparse)
4460         (push (cons gnus-reffed-article-number gnus-sparse-mark)
4461               gnus-newsgroup-reads)
4462         (decf gnus-reffed-article-number)))
4463     (gnus-message 7 "Making sparse threads...done")))
4464
4465 (defun gnus-build-old-threads ()
4466   ;; Look at all the articles that refer back to old articles, and
4467   ;; fetch the headers for the articles that aren't there.  This will
4468   ;; build complete threads - if the roots haven't been expired by the
4469   ;; server, that is.
4470   (let ((mail-parse-charset gnus-newsgroup-charset)
4471         id heads)
4472     (mapatoms
4473      (lambda (refs)
4474        (when (not (car (symbol-value refs)))
4475          (setq heads (cdr (symbol-value refs)))
4476          (while heads
4477            (if (memq (mail-header-number (caar heads))
4478                      gnus-newsgroup-dormant)
4479                (setq heads (cdr heads))
4480              (setq id (symbol-name refs))
4481              (while (and (setq id (gnus-build-get-header id))
4482                          (not (car (gnus-id-to-thread id)))))
4483              (setq heads nil)))))
4484      gnus-newsgroup-dependencies)))
4485
4486 (defsubst gnus-remove-odd-characters (string)
4487   "Translate STRING into something that doesn't contain weird characters."
4488   (mm-subst-char-in-string
4489    ?\r ?\-
4490    (mm-subst-char-in-string ?\n ?\- string t) t))
4491
4492 ;; This function has to be called with point after the article number
4493 ;; on the beginning of the line.
4494 (defsubst gnus-nov-parse-line (number dependencies &optional force-new)
4495   (let ((eol (point-at-eol))
4496         (buffer (current-buffer))
4497         header references in-reply-to)
4498
4499     ;; overview: [num subject from date id refs chars lines misc]
4500     (unwind-protect
4501         (let (x)
4502           (narrow-to-region (point) eol)
4503           (unless (eobp)
4504             (forward-char))
4505
4506           (setq header
4507                 (make-full-mail-header
4508                  number                 ; number
4509                  (condition-case ()     ; subject
4510                      (gnus-remove-odd-characters
4511                       (funcall gnus-decode-encoded-word-function
4512                                (setq x (nnheader-nov-field))))
4513                    (error x))
4514                  (condition-case ()     ; from
4515                      (gnus-remove-odd-characters
4516                       (funcall gnus-decode-encoded-address-function
4517                                (setq x (nnheader-nov-field))))
4518                    (error x))
4519                  (nnheader-nov-field)   ; date
4520                  (nnheader-nov-read-message-id number)  ; id
4521                  (setq references (nnheader-nov-field)) ; refs
4522                  (nnheader-nov-read-integer) ; chars
4523                  (nnheader-nov-read-integer) ; lines
4524                  (unless (eobp)
4525                    (if (looking-at "Xref: ")
4526                        (goto-char (match-end 0)))
4527                    (nnheader-nov-field)) ; Xref
4528                  (nnheader-nov-parse-extra)))) ; extra
4529
4530       (widen))
4531
4532     (when (and (string= references "")
4533                (setq in-reply-to (mail-header-extra header))
4534                (setq in-reply-to (cdr (assq 'In-Reply-To in-reply-to))))
4535       (mail-header-set-references
4536        header (gnus-extract-message-id-from-in-reply-to in-reply-to)))
4537
4538     (when gnus-alter-header-function
4539       (funcall gnus-alter-header-function header))
4540     (gnus-dependencies-add-header header dependencies force-new)))
4541
4542 (defun gnus-build-get-header (id)
4543   "Look through the buffer of NOV lines and find the header to ID.
4544 Enter this line into the dependencies hash table, and return
4545 the id of the parent article (if any)."
4546   (let ((deps gnus-newsgroup-dependencies)
4547         found header)
4548     (prog1
4549         (with-current-buffer nntp-server-buffer
4550           (let ((case-fold-search nil))
4551             (goto-char (point-min))
4552             (while (and (not found)
4553                         (search-forward id nil t))
4554               (beginning-of-line)
4555               (setq found (looking-at
4556                            (format "^[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t%s"
4557                                    (regexp-quote id))))
4558               (or found (beginning-of-line 2)))
4559             (when found
4560               (beginning-of-line)
4561               (and
4562                (setq header (gnus-nov-parse-line
4563                              (read (current-buffer)) deps))
4564                (gnus-parent-id (mail-header-references header))))))
4565       (when header
4566         (let ((number (mail-header-number header)))
4567           (push number gnus-newsgroup-limit)
4568           (push header gnus-newsgroup-headers)
4569           (if (memq number gnus-newsgroup-unselected)
4570               (progn
4571                 (setq gnus-newsgroup-unreads
4572                       (gnus-add-to-sorted-list gnus-newsgroup-unreads
4573                                                number))
4574                 (setq gnus-newsgroup-unselected
4575                       (delq number gnus-newsgroup-unselected)))
4576             (push number gnus-newsgroup-ancient)))))))
4577
4578 (defun gnus-build-all-threads ()
4579   "Read all the headers."
4580   (let ((gnus-summary-ignore-duplicates t)
4581         (mail-parse-charset gnus-newsgroup-charset)
4582         (dependencies gnus-newsgroup-dependencies)
4583         header article)
4584     (with-current-buffer nntp-server-buffer
4585       (let ((case-fold-search nil))
4586         (goto-char (point-min))
4587         (while (not (eobp))
4588           (ignore-errors
4589             (setq article (read (current-buffer))
4590                   header (gnus-nov-parse-line article dependencies t)))
4591           (when header
4592             (with-current-buffer gnus-summary-buffer
4593               (push header gnus-newsgroup-headers)
4594               (if (memq (setq article (mail-header-number header))
4595                         gnus-newsgroup-unselected)
4596                   (progn
4597                     (setq gnus-newsgroup-unreads
4598                           (gnus-add-to-sorted-list
4599                            gnus-newsgroup-unreads article))
4600                     (setq gnus-newsgroup-unselected
4601                           (delq article gnus-newsgroup-unselected)))
4602                 (push article gnus-newsgroup-ancient)))
4603             (forward-line 1)))))))
4604
4605 (defun gnus-summary-update-article-line (article header)
4606   "Update the line for ARTICLE using HEADER."
4607   (let* ((id (mail-header-id header))
4608          (thread (gnus-id-to-thread id)))
4609     (unless thread
4610       (error "Article in no thread"))
4611     ;; Update the thread.
4612     (setcar thread header)
4613     (gnus-summary-goto-subject article)
4614     (let* ((datal (gnus-data-find-list article))
4615            (data (car datal))
4616            (inhibit-read-only t)
4617            (level (gnus-summary-thread-level)))
4618       (gnus-delete-line)
4619       (let ((inserted (- (point)
4620                          (progn
4621                            (gnus-summary-insert-line
4622                             header level nil
4623                             (memq article gnus-newsgroup-undownloaded)
4624                             (gnus-article-mark article)
4625                             (memq article gnus-newsgroup-replied)
4626                             (memq article gnus-newsgroup-expirable)
4627                             ;; Only insert the Subject string when it's different
4628                             ;; from the previous Subject string.
4629                             (if (and
4630                                  gnus-show-threads
4631                                  (gnus-subject-equal
4632                                   (condition-case ()
4633                                       (mail-header-subject
4634                                        (gnus-data-header
4635                                         (cadr
4636                                          (gnus-data-find-list
4637                                           article
4638                                           (gnus-data-list t)))))
4639                                     ;; Error on the side of excessive subjects.
4640                                     (error ""))
4641                                   (mail-header-subject header)))
4642                                 ""
4643                               (mail-header-subject header))
4644                             nil (cdr (assq article gnus-newsgroup-scored))
4645                             (memq article gnus-newsgroup-processable))
4646                            (point)))))
4647         (when (cdr datal)
4648           (gnus-data-update-list
4649            (cdr datal)
4650            (- (gnus-data-pos data) (gnus-data-pos (cadr datal)) inserted)))))))
4651
4652 (defun gnus-summary-update-article (article &optional iheader)
4653   "Update ARTICLE in the summary buffer."
4654   (set-buffer gnus-summary-buffer)
4655   (let* ((header (gnus-summary-article-header article))
4656          (id (mail-header-id header))
4657          (data (gnus-data-find article))
4658          (thread (gnus-id-to-thread id))
4659          (references (mail-header-references header))
4660          (parent
4661           (gnus-id-to-thread
4662            (or (gnus-parent-id
4663                 (when (and references
4664                            (not (equal "" references)))
4665                   references))
4666                "none")))
4667          (inhibit-read-only t)
4668          (old (car thread)))
4669     (when thread
4670       (unless iheader
4671         (setcar thread nil)
4672         (when parent
4673           (delq thread parent)))
4674       (if (gnus-summary-insert-subject id header)
4675           ;; Set the (possibly) new article number in the data structure.
4676           (gnus-data-set-number data (gnus-id-to-article id))
4677         (setcar thread old)
4678         nil))))
4679
4680 (defun gnus-rebuild-thread (id &optional line)
4681   "Rebuild the thread containing ID.
4682 If LINE, insert the rebuilt thread starting on line LINE."
4683   (let ((inhibit-read-only t)
4684         old-pos current thread data)
4685     (if (not gnus-show-threads)
4686         (setq thread (list (car (gnus-id-to-thread id))))
4687       ;; Get the thread this article is part of.
4688       (setq thread (gnus-remove-thread id)))
4689     (setq old-pos (point-at-bol))
4690     (setq current (save-excursion
4691                     (and (re-search-backward "[\r\n]" nil t)
4692                          (gnus-summary-article-number))))
4693     ;; If this is a gathered thread, we have to go some re-gathering.
4694     (when (stringp (car thread))
4695       (let ((subject (car thread))
4696             roots thr)
4697         (setq thread (cdr thread))
4698         (while thread
4699           (unless (memq (setq thr (gnus-id-to-thread
4700                                    (gnus-root-id
4701                                     (mail-header-id (caar thread)))))
4702                         roots)
4703             (push thr roots))
4704           (setq thread (cdr thread)))
4705         ;; We now have all (unique) roots.
4706         (if (= (length roots) 1)
4707             ;; All the loose roots are now one solid root.
4708             (setq thread (car roots))
4709           (setq thread (cons subject (gnus-sort-threads roots))))))
4710     (let (threads)
4711       ;; We then insert this thread into the summary buffer.
4712       (when line
4713         (goto-char (point-min))
4714         (forward-line (1- line)))
4715       (let (gnus-newsgroup-data gnus-newsgroup-threads)
4716         (if gnus-show-threads
4717             (gnus-summary-prepare-threads (gnus-cut-threads (list thread)))
4718           (gnus-summary-prepare-unthreaded thread))
4719         (setq data (nreverse gnus-newsgroup-data))
4720         (setq threads gnus-newsgroup-threads))
4721       ;; We splice the new data into the data structure.
4722       ;;!!! This is kinda bogus.  We assume that in LINE is non-nil,
4723       ;;!!! then we want to insert at the beginning of the buffer.
4724       ;;!!! That happens to be true with Gnus now, but that may
4725       ;;!!! change in the future.  Perhaps.
4726       (gnus-data-enter-list
4727        (if line nil current) data (- (point) old-pos))
4728       (setq gnus-newsgroup-threads
4729             (nconc threads gnus-newsgroup-threads))
4730       (gnus-data-compute-positions))))
4731
4732 (defun gnus-number-to-header (number)
4733   "Return the header for article NUMBER."
4734   (let ((headers gnus-newsgroup-headers))
4735     (while (and headers
4736                 (not (= number (mail-header-number (car headers)))))
4737       (pop headers))
4738     (when headers
4739       (car headers))))
4740
4741 (defun gnus-parent-headers (in-headers &optional generation)
4742   "Return the headers of the GENERATIONth parent of HEADERS."
4743   (unless generation
4744     (setq generation 1))
4745   (let ((parent t)
4746         (headers in-headers)
4747         references)
4748     (while (and parent
4749                 (not (zerop generation))
4750                 (setq references (mail-header-references headers)))
4751       (setq headers (if (and references
4752                              (setq parent (gnus-parent-id references)))
4753                         (car (gnus-id-to-thread parent))
4754                       nil))
4755       (decf generation))
4756     (and (not (eq headers in-headers))
4757          headers)))
4758
4759 (defun gnus-id-to-thread (id)
4760   "Return the (sub-)thread where ID appears."
4761   (gnus-gethash id gnus-newsgroup-dependencies))
4762
4763 (defun gnus-id-to-article (id)
4764   "Return the article number of ID."
4765   (let ((thread (gnus-id-to-thread id)))
4766     (when (and thread
4767                (car thread))
4768       (mail-header-number (car thread)))))
4769
4770 (defun gnus-id-to-header (id)
4771   "Return the article headers of ID."
4772   (car (gnus-id-to-thread id)))
4773
4774 (defun gnus-article-displayed-root-p (article)
4775   "Say whether ARTICLE is a root(ish) article."
4776   (let ((level (gnus-summary-thread-level article))
4777         (refs (mail-header-references  (gnus-summary-article-header article)))
4778         particle)
4779     (cond
4780      ((null level) nil)
4781      ((zerop level) t)
4782      ((null refs) t)
4783      ((null (gnus-parent-id refs)) t)
4784      ((and (= 1 level)
4785            (null (setq particle (gnus-id-to-article
4786                                  (gnus-parent-id refs))))
4787            (null (gnus-summary-thread-level particle)))))))
4788
4789 (defun gnus-root-id (id)
4790   "Return the id of the root of the thread where ID appears."
4791   (let (last-id prev)
4792     (while (and id (setq prev (car (gnus-id-to-thread id))))
4793       (setq last-id id
4794             id (gnus-parent-id (mail-header-references prev))))
4795     last-id))
4796
4797 (defun gnus-articles-in-thread (thread)
4798   "Return the list of articles in THREAD."
4799   (cons (mail-header-number (car thread))
4800         (apply 'nconc (mapcar 'gnus-articles-in-thread (cdr thread)))))
4801
4802 (defun gnus-remove-thread (id &optional dont-remove)
4803   "Remove the thread that has ID in it."
4804   (let (headers thread last-id)
4805     ;; First go up in this thread until we find the root.
4806     (setq last-id (gnus-root-id id)
4807           headers (message-flatten-list (gnus-id-to-thread last-id)))
4808     ;; We have now found the real root of this thread.  It might have
4809     ;; been gathered into some loose thread, so we have to search
4810     ;; through the threads to find the thread we wanted.
4811     (let ((threads gnus-newsgroup-threads)
4812           sub)
4813       (while threads
4814         (setq sub (car threads))
4815         (if (stringp (car sub))
4816             ;; This is a gathered thread, so we look at the roots
4817             ;; below it to find whether this article is in this
4818             ;; gathered root.
4819             (progn
4820               (setq sub (cdr sub))
4821               (while sub
4822                 (when (member (caar sub) headers)
4823                   (setq thread (car threads)
4824                         threads nil
4825                         sub nil))
4826                 (setq sub (cdr sub))))
4827           ;; It's an ordinary thread, so we check it.
4828           (when (eq (car sub) (car headers))
4829             (setq thread sub
4830                   threads nil)))
4831         (setq threads (cdr threads)))
4832       ;; If this article is in no thread, then it's a root.
4833       (if thread
4834           (unless dont-remove
4835             (setq gnus-newsgroup-threads (delq thread gnus-newsgroup-threads)))
4836         (setq thread (gnus-id-to-thread last-id)))
4837       (when thread
4838         (prog1
4839             thread                      ; We return this thread.
4840           (unless dont-remove
4841             (if (stringp (car thread))
4842                 (progn
4843                   ;; If we use dummy roots, then we have to remove the
4844                   ;; dummy root as well.
4845                   (when (eq gnus-summary-make-false-root 'dummy)
4846                     ;; We go to the dummy root by going to
4847                     ;; the first sub-"thread", and then one line up.
4848                     (gnus-summary-goto-article
4849                      (mail-header-number (caadr thread)))
4850                     (forward-line -1)
4851                     (gnus-delete-line)
4852                     (gnus-data-compute-positions))
4853                   (setq thread (cdr thread))
4854                   (while thread
4855                     (gnus-remove-thread-1 (car thread))
4856                     (setq thread (cdr thread))))
4857               (gnus-remove-thread-1 thread))))))))
4858
4859 (defun gnus-remove-thread-1 (thread)
4860   "Remove the thread THREAD recursively."
4861   (let ((number (mail-header-number (pop thread)))
4862         d)
4863     (setq thread (reverse thread))
4864     (while thread
4865       (gnus-remove-thread-1 (pop thread)))
4866     (when (setq d (gnus-data-find number))
4867       (goto-char (gnus-data-pos d))
4868       (gnus-summary-show-thread)
4869       (gnus-data-remove
4870        number
4871        (- (point-at-bol)
4872           (prog1
4873               (1+ (point-at-eol))
4874             (gnus-delete-line)))))))
4875
4876 (defun gnus-sort-threads-recursive (threads func)
4877   ;; Responsible for sorting the root articles of threads.
4878   (let ((subthread-sort-func (if (eq gnus-subthread-sort-functions
4879                                      'gnus-thread-sort-functions)
4880                                  func
4881                                (gnus-make-sort-function
4882                                 gnus-subthread-sort-functions))))
4883     (sort (mapcar (lambda (thread)
4884                     (cons (car thread)
4885                           (and (cdr thread)
4886                                (gnus-sort-subthreads-recursive
4887                                 (cdr thread) subthread-sort-func))))
4888                   threads) func)))
4889
4890 (defun gnus-sort-subthreads-recursive (threads func)
4891   ;; Responsible for sorting subthreads.
4892   (sort (mapcar (lambda (thread)
4893                   (cons (car thread)
4894                         (and (cdr thread)
4895                              (gnus-sort-subthreads-recursive (cdr thread) func))))
4896                 threads) func))
4897
4898 (defun gnus-sort-threads-loop (threads func)
4899   (let* ((superthread (cons nil threads))
4900          (stack (list (cons superthread threads)))
4901          remaining-threads thread)
4902     (while stack
4903       (setq remaining-threads (cdr (car stack)))
4904       (if remaining-threads
4905           (progn (setq thread (car remaining-threads))
4906                  (setcdr (car stack) (cdr remaining-threads))
4907                  (if (cdr thread)
4908                      (push (cons thread (cdr thread)) stack)))
4909         (setq thread (caar stack))
4910         (setcdr thread (sort (cdr thread) func))
4911         (pop stack)))
4912     (cdr superthread)))
4913
4914 (defun gnus-sort-threads (threads)
4915   "Sort THREADS."
4916   (if (not gnus-thread-sort-functions)
4917       threads
4918     (gnus-message 8 "Sorting threads...")
4919     (prog1
4920         (condition-case nil
4921             (let ((max-lisp-eval-depth (max max-lisp-eval-depth 5000))
4922                   (sort-func (gnus-make-sort-function gnus-thread-sort-functions)))
4923               (gnus-sort-threads-recursive threads sort-func))
4924           ;; Even after binding max-lisp-eval-depth, the recursive
4925           ;; sorter might fail for very long threads.  In that case,
4926           ;; try using a (less well-tested) non-recursive sorter.
4927           (error (gnus-message 9 "Sorting threads with loop...")
4928                  (gnus-sort-threads-loop
4929                   threads (gnus-make-sort-function
4930                            gnus-thread-sort-functions))))
4931       (gnus-message 8 "Sorting threads...done"))))
4932
4933 (defun gnus-sort-articles (articles)
4934   "Sort ARTICLES."
4935   (when gnus-article-sort-functions
4936     (gnus-message 7 "Sorting articles...")
4937     (prog1
4938         (setq gnus-newsgroup-headers
4939               (sort articles (gnus-make-sort-function
4940                               gnus-article-sort-functions)))
4941       (gnus-message 7 "Sorting articles...done"))))
4942
4943 ;; Written by Hallvard B Furuseth <h.b.furuseth@usit.uio.no>.
4944 (defmacro gnus-thread-header (thread)
4945   "Return header of first article in THREAD.
4946 Note that THREAD must never, ever be anything else than a variable -
4947 using some other form will lead to serious barfage."
4948   (or (symbolp thread) (signal 'wrong-type-argument '(symbolp thread)))
4949   ;; (8% speedup to gnus-summary-prepare, just for fun :-)
4950   (list 'byte-code "\10\211:\203\17\0\211@;\203\16\0A@@\207"
4951         (vector thread) 2))
4952
4953 (defsubst gnus-article-sort-by-number (h1 h2)
4954   "Sort articles by article number."
4955   (< (mail-header-number h1)
4956      (mail-header-number h2)))
4957
4958 (defun gnus-thread-sort-by-number (h1 h2)
4959   "Sort threads by root article number."
4960   (gnus-article-sort-by-number
4961    (gnus-thread-header h1) (gnus-thread-header h2)))
4962
4963 (defsubst gnus-article-sort-by-random (h1 h2)
4964   "Sort articles randomly."
4965   (zerop (random 2)))
4966
4967 (defun gnus-thread-sort-by-random (h1 h2)
4968   "Sort threads randomly."
4969   (gnus-article-sort-by-random
4970    (gnus-thread-header h1) (gnus-thread-header h2)))
4971
4972 (defsubst gnus-article-sort-by-lines (h1 h2)
4973   "Sort articles by article Lines header."
4974   (< (mail-header-lines h1)
4975      (mail-header-lines h2)))
4976
4977 (defun gnus-thread-sort-by-lines (h1 h2)
4978   "Sort threads by root article Lines header."
4979   (gnus-article-sort-by-lines
4980    (gnus-thread-header h1) (gnus-thread-header h2)))
4981
4982 (defsubst gnus-article-sort-by-chars (h1 h2)
4983   "Sort articles by octet length."
4984   (< (mail-header-chars h1)
4985      (mail-header-chars h2)))
4986
4987 (defun gnus-thread-sort-by-chars (h1 h2)
4988   "Sort threads by root article octet length."
4989   (gnus-article-sort-by-chars
4990    (gnus-thread-header h1) (gnus-thread-header h2)))
4991
4992 (defsubst gnus-article-sort-by-author (h1 h2)
4993   "Sort articles by root author."
4994   (gnus-string<
4995    (let ((extract (funcall
4996                    gnus-extract-address-components
4997                    (mail-header-from h1))))
4998      (or (car extract) (cadr extract) ""))
4999    (let ((extract (funcall
5000                    gnus-extract-address-components
5001                    (mail-header-from h2))))
5002      (or (car extract) (cadr extract) ""))))
5003
5004 (defun gnus-thread-sort-by-author (h1 h2)
5005   "Sort threads by root author."
5006   (gnus-article-sort-by-author
5007    (gnus-thread-header h1)  (gnus-thread-header h2)))
5008
5009 (defsubst gnus-article-sort-by-recipient (h1 h2)
5010   "Sort articles by recipient."
5011   (gnus-string<
5012    (let ((extract (funcall
5013                    gnus-extract-address-components
5014                    (or (cdr (assq 'To (mail-header-extra h1))) ""))))
5015      (or (car extract) (cadr extract)))
5016    (let ((extract (funcall
5017                    gnus-extract-address-components
5018                    (or (cdr (assq 'To (mail-header-extra h2))) ""))))
5019      (or (car extract) (cadr extract)))))
5020
5021 (defun gnus-thread-sort-by-recipient (h1 h2)
5022   "Sort threads by root recipient."
5023   (gnus-article-sort-by-recipient
5024    (gnus-thread-header h1) (gnus-thread-header h2)))
5025
5026 (defsubst gnus-article-sort-by-subject (h1 h2)
5027   "Sort articles by root subject."
5028   (gnus-string<
5029    (downcase (gnus-simplify-subject-re (mail-header-subject h1)))
5030    (downcase (gnus-simplify-subject-re (mail-header-subject h2)))))
5031
5032 (defun gnus-thread-sort-by-subject (h1 h2)
5033   "Sort threads by root subject."
5034   (gnus-article-sort-by-subject
5035    (gnus-thread-header h1) (gnus-thread-header h2)))
5036
5037 (defsubst gnus-article-sort-by-date (h1 h2)
5038   "Sort articles by root article date."
5039   (time-less-p
5040    (gnus-date-get-time (mail-header-date h1))
5041    (gnus-date-get-time (mail-header-date h2))))
5042
5043 (defun gnus-thread-sort-by-date (h1 h2)
5044   "Sort threads by root article date."
5045   (gnus-article-sort-by-date
5046    (gnus-thread-header h1) (gnus-thread-header h2)))
5047
5048 (defsubst gnus-article-sort-by-score (h1 h2)
5049   "Sort articles by root article score.
5050 Unscored articles will be counted as having a score of zero."
5051   (> (or (cdr (assq (mail-header-number h1)
5052                     gnus-newsgroup-scored))
5053          gnus-summary-default-score 0)
5054      (or (cdr (assq (mail-header-number h2)
5055                     gnus-newsgroup-scored))
5056          gnus-summary-default-score 0)))
5057
5058 (defun gnus-thread-sort-by-score (h1 h2)
5059   "Sort threads by root article score."
5060   (gnus-article-sort-by-score
5061    (gnus-thread-header h1) (gnus-thread-header h2)))
5062
5063 (defun gnus-thread-sort-by-total-score (h1 h2)
5064   "Sort threads by the sum of all scores in the thread.
5065 Unscored articles will be counted as having a score of zero."
5066   (> (gnus-thread-total-score h1) (gnus-thread-total-score h2)))
5067
5068 (defun gnus-thread-total-score (thread)
5069   ;; This function find the total score of THREAD.
5070   (cond
5071    ((null thread)
5072     0)
5073    ((consp thread)
5074     (if (stringp (car thread))
5075         (apply gnus-thread-score-function 0
5076                (mapcar 'gnus-thread-total-score-1 (cdr thread)))
5077       (gnus-thread-total-score-1 thread)))
5078    (t
5079     (gnus-thread-total-score-1 (list thread)))))
5080
5081 (defun gnus-article-sort-by-most-recent-number (h1 h2)
5082   "Sort articles by number."
5083   (gnus-article-sort-by-number h1 h2))
5084
5085 (defun gnus-thread-sort-by-most-recent-number (h1 h2)
5086   "Sort threads such that the thread with the most recently arrived article comes first."
5087   (> (gnus-thread-highest-number h1) (gnus-thread-highest-number h2)))
5088
5089 (defun gnus-thread-highest-number (thread)
5090   "Return the highest article number in THREAD."
5091   (apply 'max (mapcar (lambda (header)
5092                         (mail-header-number header))
5093                       (message-flatten-list thread))))
5094
5095 (defun gnus-article-sort-by-most-recent-date (h1 h2)
5096   "Sort articles by number."
5097   (gnus-article-sort-by-date h1 h2))
5098
5099 (defun gnus-thread-sort-by-most-recent-date (h1 h2)
5100   "Sort threads such that the thread with the most recently dated article comes first."
5101   (> (gnus-thread-latest-date h1) (gnus-thread-latest-date h2)))
5102
5103 ; Since this is called not only to sort the top-level threads, but
5104 ; also in recursive sorts to order the articles within a thread, each
5105 ; article will be processed many times.  Thus it speeds things up
5106 ; quite a bit to use gnus-date-get-time, which caches the time value.
5107 (defun gnus-thread-latest-date (thread)
5108   "Return the highest article date in THREAD."
5109   (apply 'max
5110          (mapcar (lambda (header) (gnus-float-time
5111                                    (gnus-date-get-time
5112                                     (mail-header-date header))))
5113                  (message-flatten-list thread))))
5114
5115 (defun gnus-thread-total-score-1 (root)
5116   ;; This function find the total score of the thread below ROOT.
5117   (setq root (car root))
5118   (apply gnus-thread-score-function
5119          (or (append
5120               (mapcar 'gnus-thread-total-score
5121                       (cdr (gnus-id-to-thread (mail-header-id root))))
5122               (when (> (mail-header-number root) 0)
5123                 (list (or (cdr (assq (mail-header-number root)
5124                                      gnus-newsgroup-scored))
5125                           gnus-summary-default-score 0))))
5126              (list gnus-summary-default-score)
5127              '(0))))
5128
5129 ;; Added by Per Abrahamsen <amanda@iesd.auc.dk>.
5130 (defvar gnus-tmp-prev-subject nil)
5131 (defvar gnus-tmp-false-parent nil)
5132 (defvar gnus-tmp-root-expunged nil)
5133 (defvar gnus-tmp-dummy-line nil)
5134
5135 (defun gnus-extra-header (type &optional header)
5136   "Return the extra header of TYPE."
5137   (or (cdr (assq type (mail-header-extra (or header gnus-tmp-header))))
5138       ""))
5139
5140 (defvar gnus-tmp-thread-tree-header-string "")
5141
5142 (defcustom gnus-sum-thread-tree-root "> "
5143   "With %B spec, used for the root of a thread.
5144 If nil, use subject instead."
5145   :version "22.1"
5146   :type '(radio (const :format "%v  " nil) string)
5147   :group 'gnus-thread)
5148
5149 (defcustom gnus-sum-thread-tree-false-root "> "
5150   "With %B spec, used for a false root of a thread.
5151 If nil, use subject instead."
5152   :version "22.1"
5153   :type '(radio (const :format "%v  " nil) string)
5154   :group 'gnus-thread)
5155
5156 (defcustom gnus-sum-thread-tree-single-indent ""
5157   "With %B spec, used for a thread with just one message.
5158 If nil, use subject instead."
5159   :version "22.1"
5160   :type '(radio (const :format "%v  " nil) string)
5161   :group 'gnus-thread)
5162
5163 (defcustom gnus-sum-thread-tree-vertical "| "
5164   "With %B spec, used for drawing a vertical line."
5165   :version "22.1"
5166   :type 'string
5167   :group 'gnus-thread)
5168
5169 (defcustom gnus-sum-thread-tree-indent "  "
5170   "With %B spec, used for indenting."
5171   :version "22.1"
5172   :type 'string
5173   :group 'gnus-thread)
5174
5175 (defcustom gnus-sum-thread-tree-leaf-with-other "+-> "
5176   "With %B spec, used for a leaf with brothers."
5177   :version "22.1"
5178   :type 'string
5179   :group 'gnus-thread)
5180
5181 (defcustom gnus-sum-thread-tree-single-leaf "\\-> "
5182   "With %B spec, used for a leaf without brothers."
5183   :version "22.1"
5184   :type 'string
5185   :group 'gnus-thread)
5186
5187 (defcustom gnus-summary-display-while-building nil
5188   "If non-nil, show and update the summary buffer as it's being built.
5189 If the value is t, update the buffer after every line is inserted.  If
5190 the value is an integer (N), update the display every N lines."
5191   :version "22.1"
5192   :group 'gnus-thread
5193   :type '(choice (const :tag "off" nil)
5194                  number
5195                  (const :tag "frequently" t)))
5196
5197 (defun gnus-summary-prepare-threads (threads)
5198   "Prepare summary buffer from THREADS and indentation LEVEL.
5199 THREADS is either a list of `(PARENT [(CHILD1 [(GRANDCHILD ...]...) ...])'
5200 or a straight list of headers."
5201   (gnus-message 7 "Generating summary...")
5202
5203   (setq gnus-newsgroup-threads threads)
5204   (beginning-of-line)
5205
5206   (let ((gnus-tmp-level 0)
5207         (default-score (or gnus-summary-default-score 0))
5208         (gnus-visual-p (gnus-visual-p 'summary-highlight 'highlight))
5209         (building-line-count gnus-summary-display-while-building)
5210         (building-count (integerp gnus-summary-display-while-building))
5211         thread number subject stack state gnus-tmp-gathered beg-match
5212         new-roots gnus-tmp-new-adopts thread-end simp-subject
5213         gnus-tmp-header gnus-tmp-unread gnus-tmp-downloaded
5214         gnus-tmp-replied gnus-tmp-subject-or-nil
5215         gnus-tmp-dummy gnus-tmp-indentation gnus-tmp-lines gnus-tmp-score
5216         gnus-tmp-score-char gnus-tmp-from gnus-tmp-name
5217         gnus-tmp-number gnus-tmp-opening-bracket gnus-tmp-closing-bracket
5218         tree-stack)
5219
5220     (setq gnus-tmp-prev-subject nil
5221           gnus-tmp-thread-tree-header-string "")
5222
5223     (if (vectorp (car threads))
5224         ;; If this is a straight (sic) list of headers, then a
5225         ;; threaded summary display isn't required, so we just create
5226         ;; an unthreaded one.
5227         (gnus-summary-prepare-unthreaded threads)
5228
5229       ;; Do the threaded display.
5230
5231       (if gnus-summary-display-while-building
5232           (switch-to-buffer (buffer-name)))
5233       (while (or threads stack gnus-tmp-new-adopts new-roots)
5234
5235         (if (and (= gnus-tmp-level 0)
5236                  (or (not stack)
5237                      (= (caar stack) 0))
5238                  (not gnus-tmp-false-parent)
5239                  (or gnus-tmp-new-adopts new-roots))
5240             (if gnus-tmp-new-adopts
5241                 (setq gnus-tmp-level (if gnus-tmp-root-expunged 0 1)
5242                       thread (list (car gnus-tmp-new-adopts))
5243                       gnus-tmp-header (caar thread)
5244                       gnus-tmp-new-adopts (cdr gnus-tmp-new-adopts))
5245               (when new-roots
5246                 (setq thread (list (car new-roots))
5247                       gnus-tmp-header (caar thread)
5248                       new-roots (cdr new-roots))))
5249
5250           (if threads
5251               ;; If there are some threads, we do them before the
5252               ;; threads on the stack.
5253               (setq thread threads
5254                     gnus-tmp-header (caar thread))
5255             ;; There were no current threads, so we pop something off
5256             ;; the stack.
5257             (setq state (car stack)
5258                   gnus-tmp-level (car state)
5259                   tree-stack (cadr state)
5260                   thread (caddr state)
5261                   stack (cdr stack)
5262                   gnus-tmp-header (caar thread))))
5263
5264         (setq gnus-tmp-false-parent nil)
5265         (setq gnus-tmp-root-expunged nil)
5266         (setq thread-end nil)
5267
5268         (if (stringp gnus-tmp-header)
5269             ;; The header is a dummy root.
5270             (cond
5271              ((eq gnus-summary-make-false-root 'adopt)
5272               ;; We let the first article adopt the rest.
5273               (setq gnus-tmp-new-adopts (nconc gnus-tmp-new-adopts
5274                                                (cddar thread)))
5275               (setq gnus-tmp-gathered
5276                     (nconc (mapcar
5277                             (lambda (h) (mail-header-number (car h)))
5278                             (cddar thread))
5279                            gnus-tmp-gathered))
5280               (setq thread (cons (list (caar thread)
5281                                        (cadar thread))
5282                                  (cdr thread)))
5283               (setq gnus-tmp-level -1
5284                     gnus-tmp-false-parent t))
5285              ((eq gnus-summary-make-false-root 'empty)
5286               ;; We print adopted articles with empty subject fields.
5287               (setq gnus-tmp-gathered
5288                     (nconc (mapcar
5289                             (lambda (h) (mail-header-number (car h)))
5290                             (cddar thread))
5291                            gnus-tmp-gathered))
5292               (setq gnus-tmp-level -1))
5293              ((eq gnus-summary-make-false-root 'dummy)
5294               ;; We remember that we probably want to output a dummy
5295               ;; root.
5296               (setq gnus-tmp-dummy-line gnus-tmp-header)
5297               (setq gnus-tmp-prev-subject gnus-tmp-header))
5298              (t
5299               ;; We do not make a root for the gathered
5300               ;; sub-threads at all.
5301               (setq gnus-tmp-level -1)))
5302
5303           (setq number (mail-header-number gnus-tmp-header)
5304                 subject (mail-header-subject gnus-tmp-header)
5305                 simp-subject (gnus-simplify-subject-fully subject))
5306
5307           (cond
5308            ;; If the thread has changed subject, we might want to make
5309            ;; this subthread into a root.
5310            ((and (null gnus-thread-ignore-subject)
5311                  (not (zerop gnus-tmp-level))
5312                  gnus-tmp-prev-subject
5313                  (not (string= gnus-tmp-prev-subject simp-subject)))
5314             (setq new-roots (nconc new-roots (list (car thread)))
5315                   thread-end t
5316                   gnus-tmp-header nil))
5317            ;; If the article lies outside the current limit,
5318            ;; then we do not display it.
5319            ((not (memq number gnus-newsgroup-limit))
5320             (setq gnus-tmp-gathered
5321                   (nconc (mapcar
5322                           (lambda (h) (mail-header-number (car h)))
5323                           (cdar thread))
5324                          gnus-tmp-gathered))
5325             (setq gnus-tmp-new-adopts (if (cdar thread)
5326                                           (append gnus-tmp-new-adopts
5327                                                   (cdar thread))
5328                                         gnus-tmp-new-adopts)
5329                   thread-end t
5330                   gnus-tmp-header nil)
5331             (when (zerop gnus-tmp-level)
5332               (setq gnus-tmp-root-expunged t)))
5333            ;; Perhaps this article is to be marked as read?
5334            ((and gnus-summary-mark-below
5335                  (< (or (cdr (assq number gnus-newsgroup-scored))
5336                         default-score)
5337                     gnus-summary-mark-below)
5338                  ;; Don't touch sparse articles.
5339                  (not (gnus-summary-article-sparse-p number))
5340                  (not (gnus-summary-article-ancient-p number)))
5341             (setq gnus-newsgroup-unreads
5342                   (delq number gnus-newsgroup-unreads))
5343             (if gnus-newsgroup-auto-expire
5344                 (setq gnus-newsgroup-expirable
5345                       (gnus-add-to-sorted-list
5346                        gnus-newsgroup-expirable number))
5347               (push (cons number gnus-low-score-mark)
5348                     gnus-newsgroup-reads))))
5349
5350           (when gnus-tmp-header
5351             ;; We may have an old dummy line to output before this
5352             ;; article.
5353             (when (and gnus-tmp-dummy-line
5354                        (gnus-subject-equal
5355                         gnus-tmp-dummy-line
5356                         (mail-header-subject gnus-tmp-header)))
5357               (gnus-summary-insert-dummy-line
5358                gnus-tmp-dummy-line (mail-header-number gnus-tmp-header))
5359               (setq gnus-tmp-dummy-line nil))
5360
5361             ;; Compute the mark.
5362             (setq gnus-tmp-unread (gnus-article-mark number))
5363
5364             (push (gnus-data-make number gnus-tmp-unread (1+ (point))
5365                                   gnus-tmp-header gnus-tmp-level)
5366                   gnus-newsgroup-data)
5367
5368             ;; Actually insert the line.
5369             (setq
5370              gnus-tmp-subject-or-nil
5371              (cond
5372               ((and gnus-thread-ignore-subject
5373                     gnus-tmp-prev-subject
5374                     (not (string= gnus-tmp-prev-subject simp-subject)))
5375                subject)
5376               ((zerop gnus-tmp-level)
5377                (if (and (eq gnus-summary-make-false-root 'empty)
5378                         (memq number gnus-tmp-gathered)
5379                         gnus-tmp-prev-subject
5380                         (string= gnus-tmp-prev-subject simp-subject))
5381                    gnus-summary-same-subject
5382                  subject))
5383               (t gnus-summary-same-subject)))
5384             (if (and (eq gnus-summary-make-false-root 'adopt)
5385                      (= gnus-tmp-level 1)
5386                      (memq number gnus-tmp-gathered))
5387                 (setq gnus-tmp-opening-bracket ?\<
5388                       gnus-tmp-closing-bracket ?\>)
5389               (setq gnus-tmp-opening-bracket ?\[
5390                     gnus-tmp-closing-bracket ?\]))
5391             (if (>= gnus-tmp-level (length gnus-thread-indent-array))
5392                 (gnus-make-thread-indent-array
5393                  (max (* 2 (length gnus-thread-indent-array))
5394                       gnus-tmp-level)))
5395             (setq
5396              gnus-tmp-indentation
5397              (aref gnus-thread-indent-array gnus-tmp-level)
5398              gnus-tmp-lines (mail-header-lines gnus-tmp-header)
5399              gnus-tmp-score (or (cdr (assq number gnus-newsgroup-scored))
5400                                 gnus-summary-default-score 0)
5401              gnus-tmp-score-char
5402              (if (or (null gnus-summary-default-score)
5403                      (<= (abs (- gnus-tmp-score gnus-summary-default-score))
5404                          gnus-summary-zcore-fuzz))
5405                  ?                      ;Whitespace
5406                (if (< gnus-tmp-score gnus-summary-default-score)
5407                    gnus-score-below-mark gnus-score-over-mark))
5408              gnus-tmp-replied
5409              (cond ((memq number gnus-newsgroup-processable)
5410                     gnus-process-mark)
5411                    ((memq number gnus-newsgroup-cached)
5412                     gnus-cached-mark)
5413                    ((memq number gnus-newsgroup-replied)
5414                     gnus-replied-mark)
5415                    ((memq number gnus-newsgroup-forwarded)
5416                     gnus-forwarded-mark)
5417                    ((memq number gnus-newsgroup-saved)
5418                     gnus-saved-mark)
5419                    ((memq number gnus-newsgroup-unseen)
5420                     gnus-unseen-mark)
5421                    (t gnus-no-mark))
5422              gnus-tmp-downloaded
5423              (cond ((memq number gnus-newsgroup-undownloaded)
5424                     gnus-undownloaded-mark)
5425                    (gnus-newsgroup-agentized
5426                     gnus-downloaded-mark)
5427                    (t
5428                     gnus-no-mark))
5429              gnus-tmp-from (mail-header-from gnus-tmp-header)
5430              gnus-tmp-name
5431              (cond
5432               ((string-match "<[^>]+> *$" gnus-tmp-from)
5433                (setq beg-match (match-beginning 0))
5434                (or (and (string-match "^\".+\"" gnus-tmp-from)
5435                         (substring gnus-tmp-from 1 (1- (match-end 0))))
5436                    (substring gnus-tmp-from 0 beg-match)))
5437               ((string-match "(.+)" gnus-tmp-from)
5438                (substring gnus-tmp-from
5439                           (1+ (match-beginning 0)) (1- (match-end 0))))
5440               (t gnus-tmp-from))
5441
5442              ;; Do the %B string
5443              gnus-tmp-thread-tree-header-string
5444              (cond
5445               ((not gnus-show-threads) "")
5446               ((zerop gnus-tmp-level)
5447                (cond ((cdar thread)
5448                       (or gnus-sum-thread-tree-root subject))
5449                      (gnus-tmp-new-adopts
5450                       (or gnus-sum-thread-tree-false-root subject))
5451                      (t
5452                       (or gnus-sum-thread-tree-single-indent subject))))
5453               (t
5454                (concat (apply 'concat
5455                               (mapcar (lambda (item)
5456                                         (if (= item 1)
5457                                             gnus-sum-thread-tree-vertical
5458                                           gnus-sum-thread-tree-indent))
5459                                       (cdr (reverse tree-stack))))
5460                        (if (nth 1 thread)
5461                            gnus-sum-thread-tree-leaf-with-other
5462                          gnus-sum-thread-tree-single-leaf)))))
5463             (when (string= gnus-tmp-name "")
5464               (setq gnus-tmp-name gnus-tmp-from))
5465             (unless (numberp gnus-tmp-lines)
5466               (setq gnus-tmp-lines -1))
5467             (if (= gnus-tmp-lines -1)
5468                 (setq gnus-tmp-lines "?")
5469               (setq gnus-tmp-lines (number-to-string gnus-tmp-lines)))
5470             (gnus-put-text-property
5471              (point)
5472              (progn (eval gnus-summary-line-format-spec) (point))
5473              'gnus-number number)
5474             (when gnus-visual-p
5475               (forward-line -1)
5476               (gnus-summary-highlight-line)
5477               (when gnus-summary-update-hook
5478                 (gnus-run-hooks 'gnus-summary-update-hook))
5479               (forward-line 1))
5480
5481             (setq gnus-tmp-prev-subject simp-subject)))
5482
5483         (when (nth 1 thread)
5484           (push (list (max 0 gnus-tmp-level)
5485                       (copy-sequence tree-stack)
5486                       (nthcdr 1 thread))
5487                 stack))
5488         (push (if (nth 1 thread) 1 0) tree-stack)
5489         (incf gnus-tmp-level)
5490         (setq threads (if thread-end nil (cdar thread)))
5491         (if gnus-summary-display-while-building
5492             (if building-count
5493                 (progn
5494                   ;; use a set frequency
5495                   (setq building-line-count (1- building-line-count))
5496                   (when (= building-line-count 0)
5497                     (sit-for 0)
5498                     (setq building-line-count
5499                           gnus-summary-display-while-building)))
5500               ;; always
5501               (sit-for 0)))
5502         (unless threads
5503           (setq gnus-tmp-level 0)))))
5504   (gnus-message 7 "Generating summary...done"))
5505
5506 (defun gnus-summary-prepare-unthreaded (headers)
5507   "Generate an unthreaded summary buffer based on HEADERS."
5508   (let (header number mark)
5509
5510     (beginning-of-line)
5511
5512     (while headers
5513       ;; We may have to root out some bad articles...
5514       (when (memq (setq number (mail-header-number
5515                                 (setq header (pop headers))))
5516                   gnus-newsgroup-limit)
5517         ;; Mark article as read when it has a low score.
5518         (when (and gnus-summary-mark-below
5519                    (< (or (cdr (assq number gnus-newsgroup-scored))
5520                           gnus-summary-default-score 0)
5521                       gnus-summary-mark-below)
5522                    (not (gnus-summary-article-ancient-p number)))
5523           (setq gnus-newsgroup-unreads
5524                 (delq number gnus-newsgroup-unreads))
5525           (if gnus-newsgroup-auto-expire
5526               (push number gnus-newsgroup-expirable)
5527             (push (cons number gnus-low-score-mark)
5528                   gnus-newsgroup-reads)))
5529
5530         (setq mark (gnus-article-mark number))
5531         (push (gnus-data-make number mark (1+ (point)) header 0)
5532               gnus-newsgroup-data)
5533         (gnus-summary-insert-line
5534          header 0 number
5535          (memq number gnus-newsgroup-undownloaded)
5536          mark (memq number gnus-newsgroup-replied)
5537          (memq number gnus-newsgroup-expirable)
5538          (mail-header-subject header) nil
5539          (cdr (assq number gnus-newsgroup-scored))
5540          (memq number gnus-newsgroup-processable))))))
5541
5542 (declare-function gnus-parameter-list-identifier "gnus-art" (name) t)
5543
5544 (defun gnus-group-get-list-identifiers (group)
5545   "Get list identifier regexp for GROUP."
5546   (or (gnus-parameter-list-identifier group)
5547       (if (consp gnus-list-identifiers)
5548           (mapconcat 'identity gnus-list-identifiers " *\\|")
5549         gnus-list-identifiers)))
5550
5551 (defun gnus-summary-remove-list-identifiers ()
5552   "Remove list identifiers in `gnus-list-identifiers' from articles in the current group."
5553   (let ((regexp (gnus-group-get-list-identifiers gnus-newsgroup-name))
5554         changed subject)
5555     (when regexp
5556       (setq regexp (concat "^\\(?:R[Ee]: +\\)*\\(" regexp " *\\)"))
5557       (dolist (header gnus-newsgroup-headers)
5558         (setq subject (mail-header-subject header)
5559               changed nil)
5560         (while (string-match regexp subject)
5561           (setq subject
5562                 (concat (substring subject 0 (match-beginning 1))
5563                         (substring subject (match-end 0)))
5564                 changed t))
5565         (when changed
5566           (when (string-match "^\\(\\(?:R[Ee]: +\\)+\\)R[Ee]: +" subject)
5567             (setq subject
5568                   (concat (substring subject 0 (match-beginning 1))
5569                           (substring subject (match-end 1)))))
5570           (mail-header-set-subject header subject))))))
5571
5572 (defun gnus-fetch-headers (articles &optional limit force-new dependencies)
5573   "Fetch headers of ARTICLES."
5574   (let ((name (gnus-group-decoded-name gnus-newsgroup-name)))
5575     (gnus-message 7 "Fetching headers for %s..." name)
5576     (prog1
5577         (if (eq 'nov
5578                 (setq gnus-headers-retrieved-by
5579                       (gnus-retrieve-headers
5580                        articles gnus-newsgroup-name
5581                        (or limit
5582                            ;; We might want to fetch old headers, but
5583                            ;; not if there is only 1 article.
5584                            (and (or (and
5585                                      (not (eq gnus-fetch-old-headers 'some))
5586                                      (not (numberp gnus-fetch-old-headers)))
5587                                     (> (length articles) 1))
5588                                 gnus-fetch-old-headers)))))
5589             (gnus-get-newsgroup-headers-xover
5590              articles force-new dependencies gnus-newsgroup-name t)
5591           (gnus-get-newsgroup-headers dependencies force-new))
5592       (gnus-message 7 "Fetching headers for %s...done" name))))
5593
5594 (defun gnus-select-newsgroup (group &optional read-all select-articles)
5595   "Select newsgroup GROUP.
5596 If READ-ALL is non-nil, all articles in the group are selected.
5597 If SELECT-ARTICLES, only select those articles from GROUP."
5598   (let* ((entry (gnus-group-entry group))
5599          ;;!!! Dirty hack; should be removed.
5600          (gnus-summary-ignore-duplicates
5601           (if (eq (car (gnus-find-method-for-group group)) 'nnvirtual)
5602               t
5603             gnus-summary-ignore-duplicates))
5604          (info (nth 2 entry))
5605          charset articles fetched-articles cached)
5606
5607     (unless (gnus-check-server
5608              (set (make-local-variable 'gnus-current-select-method)
5609                   (gnus-find-method-for-group group)))
5610       (error "Couldn't open server"))
5611     (setq charset (gnus-group-name-charset gnus-current-select-method group))
5612
5613     (or (and entry (not (eq (car entry) t))) ; Either it's active...
5614         (gnus-activate-group group)     ; Or we can activate it...
5615         (progn                          ; Or we bug out.
5616           (when (derived-mode-p 'gnus-summary-mode)
5617             (gnus-kill-buffer (current-buffer)))
5618           (error
5619            "Couldn't activate group %s: %s"
5620            (mm-decode-coding-string group charset)
5621            (mm-decode-coding-string (gnus-status-message group) charset))))
5622
5623     (unless (gnus-request-group group t nil (gnus-get-info group))
5624       (when (derived-mode-p 'gnus-summary-mode)
5625         (gnus-kill-buffer (current-buffer)))
5626       (error "Couldn't request group %s: %s"
5627              (mm-decode-coding-string group charset)
5628              (mm-decode-coding-string (gnus-status-message group) charset)))
5629
5630     (when (and gnus-agent
5631                (gnus-active group))
5632       (gnus-agent-possibly-alter-active group (gnus-active group) info)
5633
5634       (setq gnus-summary-use-undownloaded-faces
5635             (gnus-agent-find-parameter
5636              group
5637              'agent-enable-undownloaded-faces)))
5638
5639     (setq gnus-newsgroup-name group
5640           gnus-newsgroup-unselected nil
5641           gnus-newsgroup-unreads (gnus-list-of-unread-articles group))
5642
5643     (let ((display (gnus-group-find-parameter group 'display)))
5644       (setq gnus-newsgroup-display
5645             (cond
5646              ((not (zerop (or (car-safe read-all) 0)))
5647               ;; The user entered the group with C-u SPC/RET, let's show
5648               ;; all articles.
5649               'gnus-not-ignore)
5650              ((eq display 'all)
5651               'gnus-not-ignore)
5652              ((arrayp display)
5653               (gnus-summary-display-make-predicate (mapcar 'identity display)))
5654              ((numberp display)
5655               ;; The following is probably the "correct" solution, but
5656               ;; it makes Gnus fetch all headers and then limit the
5657               ;; articles (which is slow), so instead we hack the
5658               ;; select-articles parameter instead. -- Simon Josefsson
5659               ;; <jas@kth.se>
5660               ;;
5661               ;; (gnus-byte-compile
5662               ;;  `(lambda () (> number ,(- (cdr (gnus-active group))
5663               ;;                         display)))))
5664               (setq select-articles
5665                     (gnus-uncompress-range
5666                      (cons (let ((tmp (- (cdr (gnus-active group)) display)))
5667                              (if (> tmp 0)
5668                                  tmp
5669                                1))
5670                            (cdr (gnus-active group)))))
5671               nil)
5672              (t
5673               nil))))
5674
5675     (gnus-summary-setup-default-charset)
5676
5677     ;; Kludge to avoid having cached articles nixed out in virtual groups.
5678     (when (gnus-virtual-group-p group)
5679       (setq cached gnus-newsgroup-cached))
5680
5681     (setq gnus-newsgroup-unreads
5682           (gnus-sorted-ndifference
5683            (gnus-sorted-ndifference gnus-newsgroup-unreads
5684                                     gnus-newsgroup-marked)
5685            gnus-newsgroup-dormant))
5686
5687     (setq gnus-newsgroup-processable nil)
5688
5689     (gnus-update-read-articles group gnus-newsgroup-unreads t)
5690
5691     ;; Adjust and set lists of article marks.
5692     (when info
5693       (gnus-adjust-marked-articles info))
5694     (if (setq articles select-articles)
5695         (setq gnus-newsgroup-unselected
5696               (gnus-sorted-difference gnus-newsgroup-unreads articles))
5697       (setq articles (gnus-articles-to-read group read-all)))
5698
5699     (cond
5700      ((null articles)
5701       ;;(gnus-message 3 "Couldn't select newsgroup -- no articles to display")
5702       'quit)
5703      ((eq articles 0) nil)
5704      (t
5705       ;; Init the dependencies hash table.
5706       (setq gnus-newsgroup-dependencies
5707             (gnus-make-hashtable (length articles)))
5708       (if (gnus-buffer-live-p gnus-group-buffer)
5709           (gnus-set-global-variables)
5710         (set-default 'gnus-newsgroup-name gnus-newsgroup-name))
5711       ;; Retrieve the headers and read them in.
5712
5713       (setq gnus-newsgroup-headers (gnus-fetch-headers articles))
5714
5715       ;; Kludge to avoid having cached articles nixed out in virtual groups.
5716       (when cached
5717         (setq gnus-newsgroup-cached cached))
5718
5719       ;; Suppress duplicates?
5720       (when gnus-suppress-duplicates
5721         (gnus-dup-suppress-articles))
5722
5723       ;; Set the initial limit.
5724       (setq gnus-newsgroup-limit (copy-sequence articles))
5725       ;; Remove canceled articles from the list of unread articles.
5726       (setq fetched-articles
5727             (mapcar (lambda (headers) (mail-header-number headers))
5728                     gnus-newsgroup-headers))
5729       (setq gnus-newsgroup-articles fetched-articles)
5730       (setq gnus-newsgroup-unreads
5731             (gnus-sorted-nintersection
5732              gnus-newsgroup-unreads fetched-articles))
5733       (gnus-compute-unseen-list)
5734
5735       ;; Removed marked articles that do not exist.
5736       (gnus-update-missing-marks
5737        (gnus-sorted-difference articles fetched-articles))
5738       ;; We might want to build some more threads first.
5739       (when (and gnus-fetch-old-headers
5740                  (eq gnus-headers-retrieved-by 'nov))
5741         (if (eq gnus-fetch-old-headers 'invisible)
5742             (gnus-build-all-threads)
5743           (gnus-build-old-threads)))
5744       ;; Let the Gnus agent mark articles as read.
5745       (when gnus-agent
5746         (gnus-agent-get-undownloaded-list))
5747       ;; Remove list identifiers from subject
5748       (gnus-summary-remove-list-identifiers)
5749       ;; Check whether auto-expire is to be done in this group.
5750       (setq gnus-newsgroup-auto-expire
5751             (and (gnus-group-auto-expirable-p group)
5752                  (not (gnus-group-read-only-p group))))
5753       ;; Set up the article buffer now, if necessary.
5754       (unless (and gnus-single-article-buffer
5755                    (equal gnus-article-buffer "*Article*"))
5756         (gnus-article-setup-buffer))
5757       ;; First and last article in this newsgroup.
5758       (when gnus-newsgroup-headers
5759         (setq gnus-newsgroup-begin
5760               (mail-header-number (car gnus-newsgroup-headers))
5761               gnus-newsgroup-end
5762               (mail-header-number
5763                (gnus-last-element gnus-newsgroup-headers))))
5764       ;; GROUP is successfully selected.
5765       (or gnus-newsgroup-headers t)))))
5766
5767 (defun gnus-compute-unseen-list ()
5768   ;; The `seen' marks are treated specially.
5769   (if (not gnus-newsgroup-seen)
5770       (setq gnus-newsgroup-unseen gnus-newsgroup-articles)
5771     (setq gnus-newsgroup-unseen
5772           (gnus-inverse-list-range-intersection
5773            gnus-newsgroup-articles gnus-newsgroup-seen))))
5774
5775 (declare-function gnus-get-predicate "gnus-agent" (predicate))
5776
5777 (defun gnus-summary-display-make-predicate (display)
5778   (require 'gnus-agent)
5779   (when (= (length display) 1)
5780     (setq display (car display)))
5781   (unless gnus-summary-display-cache
5782     (dolist (elem (append '((unread . unread)
5783                             (read . read)
5784                             (unseen . unseen))
5785                           gnus-article-mark-lists))
5786       (push (cons (cdr elem)
5787                   (gnus-byte-compile    ;Why bother?
5788                    `(lambda () (gnus-article-marked-p ',(cdr elem)))))
5789             gnus-summary-display-cache)))
5790   (let ((gnus-category-predicate-alist gnus-summary-display-cache)
5791         (gnus-category-predicate-cache gnus-summary-display-cache))
5792     (gnus-get-predicate display)))
5793
5794 ;; Uses the dynamically bound `gnus-number' variable.
5795 (defvar gnus-number)
5796 (defun gnus-article-marked-p (type &optional article)
5797   (let ((article (or article gnus-number)))
5798     (cond
5799      ((eq type 'tick)
5800       (memq article gnus-newsgroup-marked))
5801      ((eq type 'spam)
5802       (memq article gnus-newsgroup-spam-marked))
5803      ((eq type 'unsend)
5804       (memq article gnus-newsgroup-unsendable))
5805      ((eq type 'undownload)
5806       (memq article gnus-newsgroup-undownloaded))
5807      ((eq type 'download)
5808       (memq article gnus-newsgroup-downloadable))
5809      ((eq type 'unread)
5810       (memq article gnus-newsgroup-unreads))
5811      ((eq type 'read)
5812       (memq article gnus-newsgroup-reads))
5813      ((eq type 'dormant)
5814       (memq article gnus-newsgroup-dormant) )
5815      ((eq type 'expire)
5816       (memq article gnus-newsgroup-expirable))
5817      ((eq type 'reply)
5818       (memq article gnus-newsgroup-replied))
5819      ((eq type 'killed)
5820       (memq article gnus-newsgroup-killed))
5821      ((eq type 'bookmark)
5822       (assq article gnus-newsgroup-bookmarks))
5823      ((eq type 'score)
5824       (assq article gnus-newsgroup-scored))
5825      ((eq type 'save)
5826       (memq article gnus-newsgroup-saved))
5827      ((eq type 'cache)
5828       (memq article gnus-newsgroup-cached))
5829      ((eq type 'forward)
5830       (memq article gnus-newsgroup-forwarded))
5831      ((eq type 'seen)
5832       (not (memq article gnus-newsgroup-unseen)))
5833      (t t))))
5834
5835 (defun gnus-articles-to-read (group &optional read-all)
5836   "Find out what articles the user wants to read."
5837   (let* ((only-read-p t)
5838          (articles
5839           (gnus-list-range-difference
5840           ;; Select all articles if `read-all' is non-nil, or if there
5841           ;; are no unread articles.
5842           (if (or read-all
5843                   (and (zerop (length gnus-newsgroup-marked))
5844                        (zerop (length gnus-newsgroup-unreads)))
5845                   ;; Fetch all if the predicate is non-nil.
5846                   gnus-newsgroup-display)
5847               ;; We want to select the headers for all the articles in
5848               ;; the group, so we select either all the active
5849               ;; articles in the group, or (if that's nil), the
5850               ;; articles in the cache.
5851               (or
5852                (if gnus-newsgroup-maximum-articles
5853                    (let ((active (gnus-active group)))
5854                      (gnus-uncompress-range
5855                       (cons (max (car active)
5856                                  (- (cdr active)
5857                                     gnus-newsgroup-maximum-articles
5858                                     -1))
5859                             (cdr active))))
5860                  (gnus-uncompress-range (gnus-active group)))
5861                (gnus-cache-articles-in-group group))
5862             ;; Select only the "normal" subset of articles.
5863             (setq only-read-p nil)
5864             (gnus-sorted-nunion
5865              (gnus-sorted-union gnus-newsgroup-dormant gnus-newsgroup-marked)
5866              gnus-newsgroup-unreads))
5867           (cdr (assq 'unexist (gnus-info-marks (gnus-get-info group))))))
5868          (scored-list (gnus-killed-articles gnus-newsgroup-killed articles))
5869          (scored (length scored-list))
5870          (number (length articles))
5871          (marked (+ (length gnus-newsgroup-marked)
5872                     (length gnus-newsgroup-dormant)))
5873          (select
5874           (cond
5875            ((numberp read-all)
5876             read-all)
5877            ((numberp gnus-newsgroup-display)
5878             gnus-newsgroup-display)
5879            (t
5880             (condition-case ()
5881                 (cond
5882                  ((and (or (<= scored marked) (= scored number))
5883                        (numberp gnus-large-newsgroup)
5884                        (> number gnus-large-newsgroup))
5885                   (let* ((cursor-in-echo-area nil)
5886                          (initial (gnus-parameter-large-newsgroup-initial
5887                                    gnus-newsgroup-name))
5888                          (default (if only-read-p
5889                                       (or initial gnus-large-newsgroup)
5890                                     number))
5891                          (input
5892                           (read-string
5893                            (if only-read-p
5894                                (format
5895                                 "How many articles from %s (available %d, default %d): "
5896                                 (gnus-group-decoded-name
5897                                  (gnus-group-real-name gnus-newsgroup-name))
5898                                 number default)
5899                              (format
5900                               "How many articles from %s (%d default): "
5901                               (gnus-group-decoded-name
5902                                (gnus-group-real-name gnus-newsgroup-name))
5903                               default))
5904                            nil
5905                            nil
5906                            (number-to-string default))))
5907                     (if (string-match "^[ \t]*$" input) number input)))
5908                  ((and (> scored marked) (< scored number)
5909                        (> (- scored number) 20))
5910                   (let ((input
5911                          (read-string
5912                           (format "%s %s (%d scored, %d total): "
5913                                   "How many articles from"
5914                                   (gnus-group-decoded-name
5915                                    (gnus-group-real-name gnus-newsgroup-name))
5916                                   scored number))))
5917                     (if (string-match "^[ \t]*$" input)
5918                         number input)))
5919                  (t number))
5920               (quit
5921                (message "Quit getting the articles to read")
5922                nil))))))
5923     (setq select (if (stringp select) (string-to-number select) select))
5924     (if (or (null select) (zerop select))
5925         select
5926       (if (and (not (zerop scored)) (<= (abs select) scored))
5927           (progn
5928             (setq articles (sort scored-list '<))
5929             (setq number (length articles)))
5930         (setq articles (copy-sequence articles)))
5931
5932       (when (< (abs select) number)
5933         (if (< select 0)
5934             ;; Select the N oldest articles.
5935             (setcdr (nthcdr (1- (abs select)) articles) nil)
5936           ;; Select the N most recent articles.
5937           (setq articles (nthcdr (- number select) articles))))
5938       (setq gnus-newsgroup-unselected
5939             (gnus-sorted-difference gnus-newsgroup-unreads articles))
5940       (when gnus-alter-articles-to-read-function
5941         (setq articles
5942               (sort
5943                (funcall gnus-alter-articles-to-read-function
5944                         gnus-newsgroup-name articles)
5945                '<)))
5946       articles)))
5947
5948 (defun gnus-killed-articles (killed articles)
5949   (let (out)
5950     (while articles
5951       (when (inline (gnus-member-of-range (car articles) killed))
5952         (push (car articles) out))
5953       (setq articles (cdr articles)))
5954     out))
5955
5956 (defun gnus-article-mark-to-type (mark)
5957   "Return the type of MARK."
5958   (or (cadr (assq mark gnus-article-special-mark-lists))
5959       'list))
5960
5961 (defun gnus-article-unpropagatable-p (mark)
5962   "Return whether MARK should be propagated to back end."
5963   (memq mark gnus-article-unpropagated-mark-lists))
5964
5965 (defun gnus-adjust-marked-articles (info)
5966   "Set all article lists and remove all marks that are no longer valid."
5967   (let* ((marked-lists (gnus-info-marks info))
5968          (active (gnus-active (gnus-info-group info)))
5969          (min (car active))
5970          (max (cdr active))
5971          (types gnus-article-mark-lists)
5972          marks var articles article mark mark-type
5973          bgn end)
5974     ;; Hack to avoid adjusting marks for imap.
5975     (when (eq (car (gnus-find-method-for-group (gnus-info-group info)))
5976               'nnimap)
5977       (setq min 1))
5978
5979     (dolist (marks marked-lists)
5980       (setq mark (car marks)
5981             mark-type (gnus-article-mark-to-type mark)
5982             var (intern (format "gnus-newsgroup-%s" (car (rassq mark types)))))
5983       ;; We set the variable according to the type of the marks list,
5984       ;; and then adjust the marks to a subset of the active articles.
5985       (cond
5986        ;; Adjust "simple" lists - compressed yet unsorted
5987        ((eq mark-type 'list)
5988         ;; Simultaneously uncompress and clip to active range
5989         ;; See gnus-uncompress-range for a description of possible marks
5990         (let (l lh)
5991           (if (not (cadr marks))
5992               (set var nil)
5993             (setq articles (if (numberp (cddr marks))
5994                                (list (cdr marks))
5995                              (cdr marks))
5996                   lh (cons nil nil)
5997                   l lh)
5998
5999             (while (setq article (pop articles))
6000               (cond ((consp article)
6001                      (setq bgn (max (car article) min)
6002                            end (min (cdr article) max))
6003                      (while (<= bgn end)
6004                        (setq l (setcdr l (cons bgn nil))
6005                              bgn (1+ bgn))))
6006                     ((and (<= min article)
6007                           (>= max article))
6008                      (setq l (setcdr l (cons article nil))))))
6009             (set var (cdr lh)))))
6010        ;; Adjust assocs.
6011        ((eq mark-type 'tuple)
6012         (set var (setq articles (cdr marks)))
6013         (when (not (listp (cdr (symbol-value var))))
6014           (set var (list (symbol-value var))))
6015         (when (not (listp (cdr articles)))
6016           (setq articles (list articles)))
6017         (while articles
6018           (when (or (not (consp (setq article (pop articles))))
6019                     (< (car article) min)
6020                     (> (car article) max))
6021             (set var (delq article (symbol-value var))))))
6022        ;; Adjust ranges (sloppily).
6023        ((eq mark-type 'range)
6024         (cond
6025          ((eq mark 'seen)
6026           ;; Fix the record for `seen' if it looks like (seen NUM1 . NUM2).
6027           ;; It should be (seen (NUM1 . NUM2)).
6028           (when (numberp (cddr marks))
6029             (setcdr marks (list (cdr marks))))
6030           (setq articles (cdr marks))
6031           (while (and articles
6032                       (or (and (consp (car articles))
6033                                (> min (cdar articles)))
6034                           (and (numberp (car articles))
6035                                (> min (car articles)))))
6036             (pop articles))
6037           (set var articles))
6038          ((eq mark 'unexist)
6039           (set var (cdr marks)))))))))
6040
6041 (defun gnus-update-missing-marks (missing)
6042   "Go through the list of MISSING articles and remove them from the mark lists."
6043   (when missing
6044     (let (var m)
6045       ;; Go through all types.
6046       (dolist (elem gnus-article-mark-lists)
6047         (when (eq (gnus-article-mark-to-type (cdr elem)) 'list)
6048           (setq var (intern (format "gnus-newsgroup-%s" (car elem))))
6049           (when (symbol-value var)
6050             ;; This list has articles.  So we delete all missing
6051             ;; articles from it.
6052             (setq m missing)
6053             (while m
6054               (set var (delq (pop m) (symbol-value var))))))))))
6055
6056 (defun gnus-update-marks ()
6057   "Enter the various lists of marked articles into the newsgroup info list."
6058   (let ((types gnus-article-mark-lists)
6059         (info (gnus-get-info gnus-newsgroup-name))
6060         type list newmarked symbol delta-marks)
6061     (when info
6062       ;; Add all marks lists to the list of marks lists.
6063       (while (setq type (pop types))
6064         (setq list (symbol-value
6065                     (setq symbol
6066                           (intern (format "gnus-newsgroup-%s" (car type))))))
6067
6068         (when list
6069           ;; Get rid of the entries of the articles that have the
6070           ;; default score.
6071           (when (and (eq (cdr type) 'score)
6072                      gnus-save-score
6073                      list)
6074             (let* ((arts list)
6075                    (prev (cons nil list))
6076                    (all prev))
6077               (while arts
6078                 (if (or (not (consp (car arts)))
6079                         (= (cdar arts) gnus-summary-default-score))
6080                     (setcdr prev (cdr arts))
6081                   (setq prev arts))
6082                 (setq arts (cdr arts)))
6083               (setq list (cdr all)))))
6084
6085         (when (eq (cdr type) 'seen)
6086           (setq list (gnus-range-add list gnus-newsgroup-unseen)))
6087
6088         (when (eq (gnus-article-mark-to-type (cdr type)) 'list)
6089           (setq list (gnus-compress-sequence (set symbol (sort list '<)) t)))
6090
6091         (when (and (gnus-check-backend-function
6092                     'request-set-mark gnus-newsgroup-name)
6093                    (not (gnus-article-unpropagatable-p (cdr type))))
6094           (let* ((old (cdr (assq (cdr type) (gnus-info-marks info))))
6095                  ;; Don't do anything about marks for articles we
6096                  ;; didn't actually get any headers for.
6097                  (del
6098                   (gnus-list-range-intersection
6099                    gnus-newsgroup-articles
6100                    (gnus-remove-from-range (gnus-copy-sequence old) list)))
6101                  (add
6102                   (gnus-list-range-intersection
6103                    gnus-newsgroup-articles
6104                    (gnus-remove-from-range
6105                     (gnus-copy-sequence list) old))))
6106             (when add
6107               (push (list add 'add (list (cdr type))) delta-marks))
6108             (when del
6109               ;; Don't delete marks from outside the active range.
6110               ;; This shouldn't happen, but is a sanity check.
6111               (setq del (gnus-sorted-range-intersection
6112                          (gnus-active gnus-newsgroup-name) del))
6113               (push (list del 'del (list (cdr type))) delta-marks))))
6114
6115         (when (or list
6116                   (eq (cdr type) 'unexist))
6117           (push (cons (cdr type) list) newmarked)))
6118
6119       (when delta-marks
6120         (unless (gnus-check-group gnus-newsgroup-name)
6121           (error "Can't open server for %s" gnus-newsgroup-name))
6122         (gnus-request-set-mark gnus-newsgroup-name delta-marks))
6123
6124       ;; Enter these new marks into the info of the group.
6125       (if (nthcdr 3 info)
6126           (setcar (nthcdr 3 info) newmarked)
6127         ;; Add the marks lists to the end of the info.
6128         (when newmarked
6129           (setcdr (nthcdr 2 info) (list newmarked))))
6130
6131       ;; Cut off the end of the info if there's nothing else there.
6132       (let ((i 5))
6133         (while (and (> i 2)
6134                     (not (nth i info)))
6135           (when (nthcdr (decf i) info)
6136             (setcdr (nthcdr i info) nil)))))))
6137
6138 (defun gnus-set-mode-line (where)
6139   "Set the mode line of the article or summary buffers.
6140 If WHERE is `summary', the summary mode line format will be used."
6141   ;; Is this mode line one we keep updated?
6142   (when (and (memq where gnus-updated-mode-lines)
6143              (symbol-value
6144               (intern (format "gnus-%s-mode-line-format-spec" where))))
6145     (let (mode-string)
6146       ;; We evaluate this in the summary buffer since these
6147       ;; variables are buffer-local to that buffer.
6148       (with-current-buffer gnus-summary-buffer
6149         ;; We bind all these variables that are used in the `eval' form
6150         ;; below.
6151         (let* ((mformat (symbol-value
6152                          (intern
6153                           (format "gnus-%s-mode-line-format-spec" where))))
6154                (gnus-tmp-group-name (gnus-mode-string-quote
6155                                      (gnus-group-decoded-name
6156                                       gnus-newsgroup-name)))
6157                (gnus-tmp-article-number (or gnus-current-article 0))
6158                (gnus-tmp-unread gnus-newsgroup-unreads)
6159                (gnus-tmp-unread-and-unticked (length gnus-newsgroup-unreads))
6160                (gnus-tmp-unselected (length gnus-newsgroup-unselected))
6161                (gnus-tmp-unread-and-unselected
6162                 (cond ((and (zerop gnus-tmp-unread-and-unticked)
6163                             (zerop gnus-tmp-unselected))
6164                        "")
6165                       ((zerop gnus-tmp-unselected)
6166                        (format "{%d more}" gnus-tmp-unread-and-unticked))
6167                       (t (format "{%d(+%d) more}"
6168                                  gnus-tmp-unread-and-unticked
6169                                  gnus-tmp-unselected))))
6170                (gnus-tmp-subject
6171                 (if (and gnus-current-headers
6172                          (vectorp gnus-current-headers))
6173                     (gnus-mode-string-quote
6174                      (mail-header-subject gnus-current-headers))
6175                   ""))
6176                bufname-length max-len
6177                gnus-tmp-header) ;; passed as argument to any user-format-funcs
6178           (setq mode-string (eval mformat))
6179           (setq bufname-length (if (string-match "%b" mode-string)
6180                                    (- (length
6181                                        (buffer-name
6182                                         (if (eq where 'summary)
6183                                             nil
6184                                           (get-buffer gnus-article-buffer))))
6185                                       2)
6186                                  0))
6187           (setq max-len (max 4 (if gnus-mode-non-string-length
6188                                    (- (window-width)
6189                                       gnus-mode-non-string-length
6190                                       bufname-length)
6191                                  (length mode-string))))
6192           ;; We might have to chop a bit of the string off...
6193           (when (> (length mode-string) max-len)
6194             (setq mode-string
6195                   (concat (truncate-string-to-width mode-string (- max-len 3))
6196                           "...")))))
6197       ;; Update the mode line.
6198       (setq mode-line-buffer-identification
6199             (gnus-mode-line-buffer-identification (list mode-string)))
6200       (set-buffer-modified-p t))))
6201
6202 (defun gnus-create-xref-hashtb (from-newsgroup headers unreads)
6203   "Go through the HEADERS list and add all Xrefs to a hash table.
6204 The resulting hash table is returned, or nil if no Xrefs were found."
6205   (let* ((virtual (gnus-virtual-group-p from-newsgroup))
6206          (prefix (if virtual "" (gnus-group-real-prefix from-newsgroup)))
6207          (xref-hashtb (gnus-make-hashtable))
6208          start group entry number xrefs header)
6209     (while headers
6210       (setq header (pop headers))
6211       (when (and (setq xrefs (mail-header-xref header))
6212                  (not (memq (setq number (mail-header-number header))
6213                             unreads)))
6214         (setq start 0)
6215         (while (string-match "\\([^ ]+\\)[:/]\\([0-9]+\\)" xrefs start)
6216           (setq start (match-end 0))
6217           (setq group (if prefix
6218                           (concat prefix (substring xrefs (match-beginning 1)
6219                                                     (match-end 1)))
6220                         (substring xrefs (match-beginning 1) (match-end 1))))
6221           (setq number
6222                 (string-to-number (substring xrefs (match-beginning 2)
6223                                           (match-end 2))))
6224           (if (setq entry (gnus-gethash group xref-hashtb))
6225               (setcdr entry (cons number (cdr entry)))
6226             (gnus-sethash group (cons number nil) xref-hashtb)))))
6227     (and start xref-hashtb)))
6228
6229 (defun gnus-mark-xrefs-as-read (from-newsgroup headers unreads)
6230   "Look through all the headers and mark the Xrefs as read."
6231   (let ((virtual (gnus-virtual-group-p from-newsgroup))
6232         name info xref-hashtb idlist method nth4)
6233     (with-current-buffer gnus-group-buffer
6234       (when (setq xref-hashtb
6235                   (gnus-create-xref-hashtb from-newsgroup headers unreads))
6236         (mapatoms
6237          (lambda (group)
6238            (unless (string= from-newsgroup (setq name (symbol-name group)))
6239              (setq idlist (symbol-value group))
6240              ;; Dead groups are not updated.
6241              (and (prog1
6242                       (setq info (gnus-get-info name))
6243                     (when (stringp (setq nth4 (gnus-info-method info)))
6244                       (setq nth4 (gnus-server-to-method nth4))))
6245                   ;; Only do the xrefs if the group has the same
6246                   ;; select method as the group we have just read.
6247                   (or (gnus-methods-equal-p
6248                        nth4 (gnus-find-method-for-group from-newsgroup))
6249                       virtual
6250                       (equal nth4 (setq method (gnus-find-method-for-group
6251                                                 from-newsgroup)))
6252                       (and (equal (car nth4) (car method))
6253                            (equal (nth 1 nth4) (nth 1 method))))
6254                   gnus-use-cross-reference
6255                   (or (not (eq gnus-use-cross-reference t))
6256                       virtual
6257                       ;; Only do cross-references on subscribed
6258                       ;; groups, if that is what is wanted.
6259                       (<= (gnus-info-level info) gnus-level-subscribed))
6260                   (gnus-group-make-articles-read name idlist))))
6261          xref-hashtb)))))
6262
6263 (defun gnus-compute-read-articles (group articles)
6264   (let* ((entry (gnus-group-entry group))
6265          (info (nth 2 entry))
6266          (active (gnus-active group))
6267          ninfo)
6268     (when entry
6269       ;; First peel off all invalid article numbers.
6270       (when active
6271         (let ((ids articles)
6272               id first)
6273           (while (setq id (pop ids))
6274             (when (and first (> id (cdr active)))
6275               ;; We'll end up in this situation in one particular
6276               ;; obscure situation.  If you re-scan a group and get
6277               ;; a new article that is cross-posted to a different
6278               ;; group that has not been re-scanned, you might get
6279               ;; crossposted article that has a higher number than
6280               ;; Gnus believes possible.  So we re-activate this
6281               ;; group as well.  This might mean doing the
6282               ;; crossposting thingy will *increase* the number
6283               ;; of articles in some groups.  Tsk, tsk.
6284               (setq active (or (gnus-activate-group group) active)))
6285             (when (or (> id (cdr active))
6286                       (< id (car active)))
6287               (setq articles (delq id articles))))))
6288       ;; If the read list is nil, we init it.
6289       (if (and active
6290                (null (gnus-info-read info))
6291                (> (car active) 1))
6292           (setq ninfo (cons 1 (1- (car active))))
6293         (setq ninfo (gnus-info-read info)))
6294       ;; Then we add the read articles to the range.
6295       (gnus-add-to-range
6296        ninfo (setq articles (sort articles '<))))))
6297
6298 (defun gnus-group-make-articles-read (group articles)
6299   "Update the info of GROUP to say that ARTICLES are read."
6300   (let* ((num 0)
6301          (entry (gnus-group-entry group))
6302          (info (nth 2 entry))
6303          (active (gnus-active group))
6304          (set-marks
6305           (gnus-method-option-p
6306            (gnus-find-method-for-group group)
6307            'server-marks))
6308          range)
6309     (if (not entry)
6310         ;; Group that Gnus doesn't know exists, but still allow the
6311         ;; backend to set marks.
6312         (when set-marks
6313           (gnus-request-set-mark
6314            group (list (list (gnus-compress-sequence (sort articles #'<))
6315                              'add '(read)))))
6316       ;; Normal, subscribed groups.
6317       (setq range (gnus-compute-read-articles group articles))
6318       (with-current-buffer gnus-group-buffer
6319         (gnus-undo-register
6320           `(progn
6321              (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
6322              (gnus-info-set-read ',info ',(gnus-info-read info))
6323              (gnus-get-unread-articles-in-group ',info (gnus-active ,group))
6324              (when ,set-marks
6325                (gnus-request-set-mark
6326                 ,group (list (list ',range 'del '(read)))))
6327              (gnus-group-update-group ,group t))))
6328       ;; Add the read articles to the range.
6329       (gnus-info-set-read info range)
6330       (when set-marks
6331         (gnus-request-set-mark group (list (list range 'add '(read)))))
6332       ;; Then we have to re-compute how many unread
6333       ;; articles there are in this group.
6334       (when active
6335         (cond
6336          ((not range)
6337           (setq num (- (1+ (cdr active)) (car active))))
6338          ((not (listp (cdr range)))
6339           (setq num (- (cdr active) (- (1+ (cdr range))
6340                                        (car range)))))
6341          (t
6342           (while range
6343             (if (numberp (car range))
6344                 (setq num (1+ num))
6345               (setq num (+ num (- (1+ (cdar range)) (caar range)))))
6346             (setq range (cdr range)))
6347           (setq num (- (cdr active) num))))
6348         ;; Update the number of unread articles.
6349         (setcar entry num)
6350         ;; Update the group buffer.
6351         (unless (gnus-ephemeral-group-p group)
6352           (gnus-group-update-group group t))))))
6353
6354 (defun gnus-get-newsgroup-headers (&optional dependencies force-new)
6355   (let ((cur nntp-server-buffer)
6356         (dependencies
6357          (or dependencies
6358              (with-current-buffer gnus-summary-buffer
6359                gnus-newsgroup-dependencies)))
6360         headers id end ref number
6361         (mail-parse-charset gnus-newsgroup-charset)
6362         (mail-parse-ignored-charsets
6363          (save-current-buffer (condition-case nil
6364                                   (set-buffer gnus-summary-buffer)
6365                                 (error))
6366                               gnus-newsgroup-ignored-charsets)))
6367     (with-current-buffer nntp-server-buffer
6368       ;; Translate all TAB characters into SPACE characters.
6369       (subst-char-in-region (point-min) (point-max) ?\t ?  t)
6370       (subst-char-in-region (point-min) (point-max) ?\r ?  t)
6371       (ietf-drums-unfold-fws)
6372       (gnus-run-hooks 'gnus-parse-headers-hook)
6373       (let ((case-fold-search t)
6374             in-reply-to header p lines chars)
6375         (goto-char (point-min))
6376         ;; Search to the beginning of the next header.  Error messages
6377         ;; do not begin with 2 or 3.
6378         (while (re-search-forward "^[23][0-9]+ " nil t)
6379           (setq id nil
6380                 ref nil)
6381           ;; This implementation of this function, with nine
6382           ;; search-forwards instead of the one re-search-forward and
6383           ;; a case (which basically was the old function) is actually
6384           ;; about twice as fast, even though it looks messier.  You
6385           ;; can't have everything, I guess.  Speed and elegance
6386           ;; doesn't always go hand in hand.
6387           (setq
6388            header
6389            (vector
6390             ;; Number.
6391             (prog1
6392                 (setq number (read cur))
6393               (end-of-line)
6394               (setq p (point))
6395               (narrow-to-region (point)
6396                                 (or (and (search-forward "\n.\n" nil t)
6397                                          (- (point) 2))
6398                                     (point))))
6399             ;; Subject.
6400             (progn
6401               (goto-char p)
6402               (if (search-forward "\nsubject:" nil t)
6403                   (funcall gnus-decode-encoded-word-function
6404                            (nnheader-header-value))
6405                 "(none)"))
6406             ;; From.
6407             (progn
6408               (goto-char p)
6409               (if (search-forward "\nfrom:" nil t)
6410                   (funcall gnus-decode-encoded-address-function
6411                            (nnheader-header-value))
6412                 "(nobody)"))
6413             ;; Date.
6414             (progn
6415               (goto-char p)
6416               (if (search-forward "\ndate:" nil t)
6417                   (nnheader-header-value) ""))
6418             ;; Message-ID.
6419             (progn
6420               (goto-char p)
6421               (setq id (if (re-search-forward
6422                             "^message-id: *\\(<[^\n\t> ]+>\\)" nil t)
6423                            ;; We do it this way to make sure the Message-ID
6424                            ;; is (somewhat) syntactically valid.
6425                            (buffer-substring (match-beginning 1)
6426                                              (match-end 1))
6427                          ;; If there was no message-id, we just fake one
6428                          ;; to make subsequent routines simpler.
6429                          (nnheader-generate-fake-message-id number))))
6430             ;; References.
6431             (progn
6432               (goto-char p)
6433               (if (search-forward "\nreferences:" nil t)
6434                   (progn
6435                     (setq end (point))
6436                     (prog1
6437                         (nnheader-header-value)
6438                       (setq ref
6439                             (buffer-substring
6440                              (progn
6441                                (end-of-line)
6442                                (search-backward ">" end t)
6443                                (1+ (point)))
6444                              (progn
6445                                (search-backward "<" end t)
6446                                (point))))))
6447                 ;; Get the references from the in-reply-to header if there
6448                 ;; were no references and the in-reply-to header looks
6449                 ;; promising.
6450                 (if (and (search-forward "\nin-reply-to:" nil t)
6451                          (setq in-reply-to (nnheader-header-value))
6452                          (string-match "<[^>]+>" in-reply-to))
6453                     (let (ref2)
6454                       (setq ref (substring in-reply-to (match-beginning 0)
6455                                            (match-end 0)))
6456                       (while (string-match "<[^>]+>" in-reply-to (match-end 0))
6457                         (setq ref2 (substring in-reply-to (match-beginning 0)
6458                                               (match-end 0)))
6459                         (when (> (length ref2) (length ref))
6460                           (setq ref ref2)))
6461                       ref)
6462                   (setq ref nil))))
6463             ;; Chars.
6464             (progn
6465               (goto-char p)
6466               (if (search-forward "\nchars: " nil t)
6467                   (if (numberp (setq chars (ignore-errors (read cur))))
6468                       chars -1)
6469                 -1))
6470             ;; Lines.
6471             (progn
6472               (goto-char p)
6473               (if (search-forward "\nlines: " nil t)
6474                   (if (numberp (setq lines (ignore-errors (read cur))))
6475                       lines -1)
6476                 -1))
6477             ;; Xref.
6478             (progn
6479               (goto-char p)
6480               (and (search-forward "\nxref:" nil t)
6481                    (nnheader-header-value)))
6482             ;; Extra.
6483             (when gnus-extra-headers
6484               (let ((extra gnus-extra-headers)
6485                     out)
6486                 (while extra
6487                   (goto-char p)
6488                   (when (search-forward
6489                          (concat "\n" (symbol-name (car extra)) ":") nil t)
6490                     (push (cons (car extra) (nnheader-header-value))
6491                           out))
6492                   (pop extra))
6493                 out))))
6494           (when (equal id ref)
6495             (setq ref nil))
6496
6497           (when gnus-alter-header-function
6498             (funcall gnus-alter-header-function header)
6499             (setq id (mail-header-id header)
6500                   ref (gnus-parent-id (mail-header-references header))))
6501
6502           (when (setq header
6503                       (gnus-dependencies-add-header
6504                        header dependencies force-new))
6505             (push header headers))
6506           (goto-char (point-max))
6507           (widen))
6508         (nreverse headers)))))
6509
6510 ;; Goes through the xover lines and returns a list of vectors
6511 (defun gnus-get-newsgroup-headers-xover (sequence &optional
6512                                                   force-new dependencies
6513                                                   group also-fetch-heads)
6514   "Parse the news overview data in the server buffer.
6515 Return a list of headers that match SEQUENCE (see
6516 `nntp-retrieve-headers')."
6517   ;; Get the Xref when the users reads the articles since most/some
6518   ;; NNTP servers do not include Xrefs when using XOVER.
6519   (setq gnus-article-internal-prepare-hook '(gnus-article-get-xrefs))
6520   (let ((mail-parse-charset gnus-newsgroup-charset)
6521         (mail-parse-ignored-charsets gnus-newsgroup-ignored-charsets)
6522         (cur nntp-server-buffer)
6523         (dependencies (or dependencies gnus-newsgroup-dependencies))
6524         (allp (cond
6525                ((eq gnus-read-all-available-headers t)
6526                 t)
6527                ((and (stringp gnus-read-all-available-headers)
6528                      group)
6529                 (string-match gnus-read-all-available-headers group))
6530                (t
6531                 nil)))
6532         number headers header)
6533     (with-current-buffer nntp-server-buffer
6534       (subst-char-in-region (point-min) (point-max) ?\r ?  t)
6535       ;; Allow the user to mangle the headers before parsing them.
6536       (gnus-run-hooks 'gnus-parse-headers-hook)
6537       (goto-char (point-min))
6538       (gnus-parse-without-error
6539         (while (and (or sequence allp)
6540                     (not (eobp)))
6541           (setq number (read cur))
6542           (when (not allp)
6543             (while (and sequence
6544                         (< (car sequence) number))
6545               (setq sequence (cdr sequence))))
6546           (when (and (or allp
6547                          (and sequence
6548                               (eq number (car sequence))))
6549                      (progn
6550                        (setq sequence (cdr sequence))
6551                        (setq header (inline
6552                                       (gnus-nov-parse-line
6553                                        number dependencies force-new)))))
6554             (push header headers))
6555           (forward-line 1)))
6556       ;; A common bug in inn is that if you have posted an article and
6557       ;; then retrieves the active file, it will answer correctly --
6558       ;; the new article is included.  However, a NOV entry for the
6559       ;; article may not have been generated yet, so this may fail.
6560       ;; We work around this problem by retrieving the last few
6561       ;; headers using HEAD.
6562       (if (or (not also-fetch-heads)
6563               (not sequence))
6564           ;; We (probably) got all the headers.
6565           (nreverse headers)
6566         (let ((gnus-nov-is-evil t))
6567           (nconc
6568            (nreverse headers)
6569            (when (eq (gnus-retrieve-headers sequence group) 'headers)
6570              (gnus-get-newsgroup-headers))))))))
6571
6572 (defun gnus-article-get-xrefs ()
6573   "Fill in the Xref value in `gnus-current-headers', if necessary.
6574 This is meant to be called in `gnus-article-internal-prepare-hook'."
6575   (let ((headers (with-current-buffer gnus-summary-buffer
6576                    gnus-current-headers)))
6577     (or (not gnus-use-cross-reference)
6578         (not headers)
6579         (and (mail-header-xref headers)
6580              (not (string= (mail-header-xref headers) "")))
6581         (let ((case-fold-search t)
6582               xref)
6583           (save-restriction
6584             (nnheader-narrow-to-headers)
6585             (goto-char (point-min))
6586             (when (or (and (not (eobp))
6587                            (eq (downcase (char-after)) ?x)
6588                            (looking-at "Xref:"))
6589                       (search-forward "\nXref:" nil t))
6590               (goto-char (1+ (match-end 0)))
6591               (setq xref (buffer-substring (point) (point-at-eol)))
6592               (mail-header-set-xref headers xref)))))))
6593
6594 (defun gnus-summary-insert-subject (id &optional old-header use-old-header)
6595   "Find article ID and insert the summary line for that article.
6596 OLD-HEADER can either be a header or a line number to insert
6597 the subject line on.
6598 If USE-OLD-HEADER is non-nil, then OLD-HEADER should be a header,
6599 and OLD-HEADER will be used when the summary line is inserted,
6600 too, instead of trying to fetch new headers."
6601   (let* ((line (and (numberp old-header) old-header))
6602          (old-header (and (vectorp old-header) old-header))
6603          (header (cond ((and old-header use-old-header)
6604                         old-header)
6605                        ((and (numberp id)
6606                              (gnus-number-to-header id))
6607                         (gnus-number-to-header id))
6608                        (t
6609                         (gnus-read-header id))))
6610          (number (and (numberp id) id))
6611          d)
6612     (when header
6613       ;; Rebuild the thread that this article is part of and go to the
6614       ;; article we have fetched.
6615       (when (and (not gnus-show-threads)
6616                  old-header)
6617         (when (and number
6618                    (setq d (gnus-data-find (mail-header-number old-header))))
6619           (goto-char (gnus-data-pos d))
6620           (gnus-data-remove
6621            number
6622            (- (point-at-bol)
6623               (prog1
6624                   (1+ (point-at-eol))
6625                 (gnus-delete-line))))))
6626       ;; Remove list identifiers from subject.
6627       (let ((gnus-newsgroup-headers (list header)))
6628         (gnus-summary-remove-list-identifiers))
6629       (when old-header
6630         (mail-header-set-number header (mail-header-number old-header)))
6631       (setq gnus-newsgroup-sparse
6632             (delq (setq number (mail-header-number header))
6633                   gnus-newsgroup-sparse))
6634       (setq gnus-newsgroup-ancient (delq number gnus-newsgroup-ancient))
6635       (push number gnus-newsgroup-limit)
6636       (gnus-rebuild-thread (mail-header-id header) line)
6637       (gnus-summary-goto-subject number nil t))
6638     (when (and (numberp number)
6639                (> number 0))
6640       ;; We have to update the boundaries even if we can't fetch the
6641       ;; article if ID is a number -- so that the next `P' or `N'
6642       ;; command will fetch the previous (or next) article even
6643       ;; if the one we tried to fetch this time has been canceled.
6644       (unless (and gnus-newsgroup-end (< number gnus-newsgroup-end))
6645         (setq gnus-newsgroup-end number))
6646       (unless (and gnus-newsgroup-begin (> number gnus-newsgroup-begin))
6647         (setq gnus-newsgroup-begin number))
6648       (setq gnus-newsgroup-unselected
6649             (delq number gnus-newsgroup-unselected)))
6650     ;; Report back a success?
6651     (and header (mail-header-number header))))
6652
6653 ;;; Process/prefix in the summary buffer
6654
6655 (defun gnus-summary-work-articles (n)
6656   "Return a list of articles to be worked upon.
6657 The prefix argument, the list of process marked articles, and the
6658 current article will be taken into consideration."
6659   (with-current-buffer gnus-summary-buffer
6660     (cond
6661      (n
6662       ;; A numerical prefix has been given.
6663       (setq n (prefix-numeric-value n))
6664       (let ((backward (< n 0))
6665             (n (abs (prefix-numeric-value n)))
6666             articles article)
6667         (save-excursion
6668           (while
6669               (and (> n 0)
6670                    (push (setq article (gnus-summary-article-number))
6671                          articles)
6672                    (if backward
6673                        (gnus-summary-find-prev nil article)
6674                      (gnus-summary-find-next nil article)))
6675             (decf n)))
6676         (nreverse articles)))
6677      ((and (gnus-region-active-p) (mark))
6678       (message "region active")
6679       ;; Work on the region between point and mark.
6680       (let ((max (max (point) (mark)))
6681             articles article)
6682         (save-excursion
6683           (goto-char (min (point) (mark)))
6684           (while
6685               (and
6686                (push (setq article (gnus-summary-article-number)) articles)
6687                (gnus-summary-find-next nil article)
6688                (< (point) max)))
6689           (nreverse articles))))
6690      (gnus-newsgroup-processable
6691       ;; There are process-marked articles present.
6692       ;; Save current state.
6693       (gnus-summary-save-process-mark)
6694       ;; Return the list.
6695       (reverse gnus-newsgroup-processable))
6696      (t
6697       ;; Just return the current article.
6698       (list (gnus-summary-article-number))))))
6699
6700 (defmacro gnus-summary-iterate (arg &rest forms)
6701   "Iterate over the process/prefixed articles and do FORMS.
6702 ARG is the interactive prefix given to the command.  FORMS will be
6703 executed with point over the summary line of the articles."
6704   (let ((articles (make-symbol "gnus-summary-iterate-articles")))
6705     `(let ((,articles (gnus-summary-work-articles ,arg)))
6706        (while ,articles
6707          (gnus-summary-goto-subject (car ,articles))
6708          ,@forms
6709          (pop ,articles)))))
6710
6711 (put 'gnus-summary-iterate 'lisp-indent-function 1)
6712 (put 'gnus-summary-iterate 'edebug-form-spec '(form body))
6713
6714 (defun gnus-summary-save-process-mark ()
6715   "Push the current set of process marked articles on the stack."
6716   (interactive)
6717   (push (copy-sequence gnus-newsgroup-processable)
6718         gnus-newsgroup-process-stack))
6719
6720 (defun gnus-summary-kill-process-mark ()
6721   "Push the current set of process marked articles on the stack and unmark."
6722   (interactive)
6723   (gnus-summary-save-process-mark)
6724   (gnus-summary-unmark-all-processable))
6725
6726 (defun gnus-summary-yank-process-mark ()
6727   "Pop the last process mark state off the stack and restore it."
6728   (interactive)
6729   (unless gnus-newsgroup-process-stack
6730     (error "Empty mark stack"))
6731   (gnus-summary-process-mark-set (pop gnus-newsgroup-process-stack)))
6732
6733 (defun gnus-summary-process-mark-set (set)
6734   "Make SET into the current process marked articles."
6735   (gnus-summary-unmark-all-processable)
6736   (mapc 'gnus-summary-set-process-mark set))
6737
6738 ;;; Searching and stuff
6739
6740 (defun gnus-summary-search-group (&optional backward use-level)
6741   "Search for next unread newsgroup.
6742 If optional argument BACKWARD is non-nil, search backward instead."
6743   (with-current-buffer gnus-group-buffer
6744     (when (gnus-group-search-forward
6745            backward nil (if use-level (gnus-group-group-level) nil))
6746       (gnus-group-group-name))))
6747
6748 (defun gnus-summary-best-group (&optional exclude-group)
6749   "Find the name of the best unread group.
6750 If EXCLUDE-GROUP, do not go to this group."
6751   (with-current-buffer gnus-group-buffer
6752     (save-excursion
6753       (gnus-group-best-unread-group exclude-group))))
6754
6755 (defun gnus-summary-find-next (&optional unread article backward)
6756   (if backward
6757       (gnus-summary-find-prev unread article)
6758     (let* ((dummy (gnus-summary-article-intangible-p))
6759            (article (or article (gnus-summary-article-number)))
6760            (data (gnus-data-find-list article))
6761            result)
6762       (when (and (not dummy)
6763                  (or (not gnus-summary-check-current)
6764                      (not unread)
6765                      (not (gnus-data-unread-p (car data)))))
6766         (setq data (cdr data)))
6767       (when (setq result
6768                   (if unread
6769                       (progn
6770                         (while data
6771                           (unless (memq (gnus-data-number (car data))
6772                                         (cond
6773                                          ((eq gnus-auto-goto-ignores
6774                                               'always-undownloaded)
6775                                           gnus-newsgroup-undownloaded)
6776                                          (gnus-plugged
6777                                           nil)
6778                                          ((eq gnus-auto-goto-ignores
6779                                               'unfetched)
6780                                           gnus-newsgroup-unfetched)
6781                                          ((eq gnus-auto-goto-ignores
6782                                               'undownloaded)
6783                                           gnus-newsgroup-undownloaded)))
6784                             (when (gnus-data-unread-p (car data))
6785                               (setq result (car data)
6786                                     data nil)))
6787                           (setq data (cdr data)))
6788                         result)
6789                     (car data)))
6790         (goto-char (gnus-data-pos result))
6791         (gnus-data-number result)))))
6792
6793 (defun gnus-summary-find-prev (&optional unread article)
6794   (let* ((eobp (eobp))
6795          (article (or article (gnus-summary-article-number)))
6796          (data (gnus-data-find-list article (gnus-data-list 'rev)))
6797          result)
6798     (when (and (not eobp)
6799                (or (not gnus-summary-check-current)
6800                    (not unread)
6801                    (not (gnus-data-unread-p (car data)))))
6802       (setq data (cdr data)))
6803     (when (setq result
6804                 (if unread
6805                     (progn
6806                       (while data
6807                         (unless (memq (gnus-data-number (car data))
6808                                       (cond
6809                                        ((eq gnus-auto-goto-ignores
6810                                             'always-undownloaded)
6811                                         gnus-newsgroup-undownloaded)
6812                                        (gnus-plugged
6813                                         nil)
6814                                        ((eq gnus-auto-goto-ignores
6815                                             'unfetched)
6816                                         gnus-newsgroup-unfetched)
6817                                        ((eq gnus-auto-goto-ignores
6818                                             'undownloaded)
6819                                         gnus-newsgroup-undownloaded)))
6820                           (when (gnus-data-unread-p (car data))
6821                             (setq result (car data)
6822                                   data nil)))
6823                         (setq data (cdr data)))
6824                       result)
6825                   (car data)))
6826       (goto-char (gnus-data-pos result))
6827       (gnus-data-number result))))
6828
6829 (defun gnus-summary-find-subject (subject &optional unread backward article)
6830   (let* ((simp-subject (gnus-simplify-subject-fully subject))
6831          (article (or article (gnus-summary-article-number)))
6832          (articles (gnus-data-list backward))
6833          (arts (gnus-data-find-list article articles))
6834          result)
6835     (when (or (not gnus-summary-check-current)
6836               (not unread)
6837               (not (gnus-data-unread-p (car arts))))
6838       (setq arts (cdr arts)))
6839     (while arts
6840       (and (or (not unread)
6841                (gnus-data-unread-p (car arts)))
6842            (vectorp (gnus-data-header (car arts)))
6843            (gnus-subject-equal
6844             simp-subject (mail-header-subject (gnus-data-header (car arts))) t)
6845            (setq result (car arts)
6846                  arts nil))
6847       (setq arts (cdr arts)))
6848     (and result
6849          (goto-char (gnus-data-pos result))
6850          (gnus-data-number result))))
6851
6852 (defun gnus-summary-search-forward (&optional unread subject backward)
6853   "Search forward for an article.
6854 If UNREAD, look for unread articles.  If SUBJECT, look for
6855 articles with that subject.  If BACKWARD, search backward instead."
6856   (cond (subject (gnus-summary-find-subject subject unread backward))
6857         (backward (gnus-summary-find-prev unread))
6858         (t (gnus-summary-find-next unread))))
6859
6860 (defun gnus-recenter (&optional n)
6861   "Center point in window and redisplay frame.
6862 Also do horizontal recentering."
6863   (interactive "P")
6864   (when (and gnus-auto-center-summary
6865              (not (eq gnus-auto-center-summary 'vertical)))
6866     (gnus-horizontal-recenter))
6867   (if (fboundp 'recenter-top-bottom)
6868       (recenter-top-bottom n)
6869     (recenter n)))
6870
6871 (put 'gnus-recenter 'isearch-scroll t)
6872
6873 (defun gnus-forward-line-ignore-invisible (n)
6874   "Move N lines forward (backward if N is negative).
6875 Like forward-line, but skip over (and don't count) invisible lines."
6876   (let (done)
6877     (while (and (> n 0) (not done))
6878       ;; If the following character is currently invisible,
6879       ;; skip all characters with that same `invisible' property value.
6880       (while (gnus-invisible-p (point))
6881         (goto-char (gnus-next-char-property-change (point))))
6882       (forward-line 1)
6883       (if (eobp)
6884           (setq done t)
6885         (setq n (1- n))))
6886     (while (and (< n 0) (not done))
6887       (forward-line -1)
6888       (if (bobp) (setq done t)
6889         (setq n (1+ n))
6890         (while (and (not (bobp)) (gnus-invisible-p (1- (point))))
6891           (goto-char (gnus-previous-char-property-change (point))))))))
6892
6893 (defun gnus-summary-recenter ()
6894   "Center point in the summary window.
6895 If `gnus-auto-center-summary' is nil, or the article buffer isn't
6896 displayed, no centering will be performed."
6897   ;; Suggested by earle@mahendo.JPL.NASA.GOV (Greg Earle).
6898   ;; Recenter only when requested.  Suggested by popovich@park.cs.columbia.edu.
6899   (interactive)
6900   ;; The user has to want it.
6901   (when gnus-auto-center-summary
6902     (let* ((top (cond ((< (window-height) 4) 0)
6903                       ((< (window-height) 7) 1)
6904                       (t (if (numberp gnus-auto-center-summary)
6905                              gnus-auto-center-summary
6906                            (/ (1- (window-height)) 2)))))
6907            (height (1- (window-height)))
6908            (bottom (save-excursion
6909                      (goto-char (point-max))
6910                      (gnus-forward-line-ignore-invisible (- height))
6911                      (point)))
6912            (window (get-buffer-window (current-buffer))))
6913       (when (get-buffer-window gnus-article-buffer)
6914         ;; Only do recentering when the article buffer is displayed,
6915         ;; Set the window start to either `bottom', which is the biggest
6916         ;; possible valid number, or the second line from the top,
6917         ;; whichever is the least.
6918         (let ((top-pos (save-excursion
6919                          (gnus-forward-line-ignore-invisible (- top))
6920                          (point))))
6921           (if (> bottom top-pos)
6922               ;; Keep the second line from the top visible
6923               (set-window-start window top-pos)
6924             ;; Try to keep the bottom line visible; if it's partially
6925             ;; obscured, either scroll one more line to make it fully
6926             ;; visible, or revert to using TOP-POS.
6927             (save-excursion
6928               (goto-char (point-max))
6929               (gnus-forward-line-ignore-invisible -1)
6930               (let ((last-line-start (point)))
6931                 (goto-char bottom)
6932                 (set-window-start window (point) t)
6933                 (when (not (pos-visible-in-window-p last-line-start window))
6934                   (gnus-forward-line-ignore-invisible 1)
6935                   (set-window-start window (min (point) top-pos) t)))))))
6936       ;; Do horizontal recentering while we're at it.
6937       (when (and (get-buffer-window (current-buffer) t)
6938                  (not (eq gnus-auto-center-summary 'vertical)))
6939         (let ((selected (selected-window)))
6940           (select-window (get-buffer-window (current-buffer) t))
6941           (gnus-summary-position-point)
6942           (gnus-horizontal-recenter)
6943           (select-window selected))))))
6944
6945 (defun gnus-summary-jump-to-group (newsgroup)
6946   "Move point to NEWSGROUP in group mode buffer."
6947   ;; Keep update point of group mode buffer if visible.
6948   (if (eq (current-buffer) (get-buffer gnus-group-buffer))
6949       (save-window-excursion
6950         ;; Take care of tree window mode.
6951         (when (get-buffer-window gnus-group-buffer)
6952           (pop-to-buffer gnus-group-buffer))
6953         (gnus-group-jump-to-group newsgroup))
6954     (save-excursion
6955       ;; Take care of tree window mode.
6956       (if (get-buffer-window gnus-group-buffer 0)
6957           (pop-to-buffer gnus-group-buffer)
6958         (set-buffer gnus-group-buffer))
6959       (gnus-group-jump-to-group newsgroup))))
6960
6961 ;; This function returns a list of article numbers based on the
6962 ;; difference between the ranges of read articles in this group and
6963 ;; the range of active articles.
6964 (defun gnus-list-of-unread-articles (group)
6965   (let* ((read (gnus-info-read (gnus-get-info group)))
6966          (active (or (gnus-active group) (gnus-activate-group group)))
6967          (last (or (cdr active)
6968                    (error "Group %s couldn't be activated " group)))
6969          (bottom (if gnus-newsgroup-maximum-articles
6970                      (max (car active)
6971                           (- last gnus-newsgroup-maximum-articles -1))
6972                    (car active)))
6973          first nlast unread)
6974     ;; If none are read, then all are unread.
6975     (if (not read)
6976         (setq first bottom)
6977       ;; If the range of read articles is a single range, then the
6978       ;; first unread article is the article after the last read
6979       ;; article.  Sounds logical, doesn't it?
6980       (if (and (not (listp (cdr read)))
6981                (or (< (car read) bottom)
6982                    (progn (setq read (list read))
6983                           nil)))
6984           (setq first (max bottom (1+ (cdr read))))
6985         ;; `read' is a list of ranges.
6986         (when (/= (setq nlast (or (and (numberp (car read)) (car read))
6987                                   (caar read)))
6988                   1)
6989           (setq first bottom))
6990         (while read
6991           (when first
6992             (while (< first nlast)
6993               (setq unread (cons first unread)
6994                     first (1+ first))))
6995           (setq first (1+ (if (atom (car read)) (car read) (cdar read))))
6996           (setq nlast (if (atom (cadr read)) (cadr read) (caadr read)))
6997           (setq read (cdr read)))))
6998     ;; And add the last unread articles.
6999     (while (<= first last)
7000       (setq unread (cons first unread)
7001             first (1+ first)))
7002     ;; Return the list of unread articles.
7003     (delq 0 (nreverse unread))))
7004
7005 (defun gnus-list-of-read-articles (group)
7006   "Return a list of unread, unticked and non-dormant articles."
7007   (let* ((info (gnus-get-info group))
7008          (marked (gnus-info-marks info))
7009          (active (gnus-active group)))
7010     (and info active
7011          (gnus-list-range-difference
7012           (gnus-list-range-difference
7013            (gnus-sorted-complement
7014             (gnus-uncompress-range
7015              (if gnus-newsgroup-maximum-articles
7016                  (cons (max (car active)
7017                             (- (cdr active)
7018                                gnus-newsgroup-maximum-articles
7019                                -1))
7020                        (cdr active))
7021                active))
7022             (gnus-list-of-unread-articles group))
7023            (cdr (assq 'dormant marked)))
7024           (cdr (assq 'tick marked))))))
7025
7026 ;; This function returns a sequence of article numbers based on the
7027 ;; difference between the ranges of read articles in this group and
7028 ;; the range of active articles.
7029 (defun gnus-sequence-of-unread-articles (group)
7030   (let* ((read (gnus-info-read (gnus-get-info group)))
7031          (active (or (gnus-active group) (gnus-activate-group group)))
7032          (last (cdr active))
7033          (bottom (if gnus-newsgroup-maximum-articles
7034                      (max (car active)
7035                           (- last gnus-newsgroup-maximum-articles -1))
7036                    (car active)))
7037          first nlast unread)
7038     ;; If none are read, then all are unread.
7039     (if (not read)
7040         (setq first bottom)
7041       ;; If the range of read articles is a single range, then the
7042       ;; first unread article is the article after the last read
7043       ;; article.  Sounds logical, doesn't it?
7044       (if (and (not (listp (cdr read)))
7045                (or (< (car read) bottom)
7046                    (progn (setq read (list read))
7047                           nil)))
7048           (setq first (max bottom (1+ (cdr read))))
7049         ;; `read' is a list of ranges.
7050         (when (/= (setq nlast (or (and (numberp (car read)) (car read))
7051                                   (caar read)))
7052                   1)
7053           (setq first bottom))
7054         (while read
7055           (when first
7056             (push (cons first nlast) unread))
7057           (setq first (1+ (if (atom (car read)) (car read) (cdar read))))
7058           (setq nlast (if (atom (cadr read)) (cadr read) (caadr read)))
7059           (setq read (cdr read)))))
7060     ;; And add the last unread articles.
7061     (cond ((not (and first last))
7062            nil)
7063           ((< first last)
7064            (push (cons first last) unread))
7065           ((= first last)
7066            (push first unread)))
7067     ;; Return the sequence of unread articles.
7068     (delq 0 (nreverse unread))))
7069
7070 ;; Various summary commands
7071
7072 (defun gnus-summary-select-article-buffer ()
7073   "Reconfigure windows to show the article buffer.
7074 If `gnus-widen-article-window' is set, show only the article
7075 buffer."
7076   (interactive)
7077   (if (not (gnus-buffer-live-p gnus-article-buffer))
7078       (error "There is no article buffer for this summary buffer")
7079     (unless (get-buffer-window gnus-article-buffer)
7080       (gnus-summary-show-article))
7081     (gnus-configure-windows
7082      (if gnus-widen-article-window
7083          'only-article
7084        'article)
7085      t)
7086     (select-window (get-buffer-window gnus-article-buffer))))
7087
7088 (defun gnus-summary-universal-argument (arg)
7089   "Perform any operation on all articles that are process/prefixed."
7090   (interactive "P")
7091   (let ((articles (gnus-summary-work-articles arg))
7092         func article)
7093     (if (eq
7094          (setq
7095           func
7096           (key-binding
7097            (read-key-sequence
7098             (substitute-command-keys
7099              "\\<gnus-summary-mode-map>\\[gnus-summary-universal-argument]"))))
7100          'undefined)
7101         (gnus-error 1 "Undefined key")
7102       (save-excursion
7103         (while articles
7104           (gnus-summary-goto-subject (setq article (pop articles)))
7105           (let (gnus-newsgroup-processable)
7106             (command-execute func))
7107           (gnus-summary-remove-process-mark article)))))
7108   (gnus-summary-position-point))
7109
7110 (defun gnus-summary-toggle-truncation (&optional arg)
7111   "Toggle truncation of summary lines.
7112 With ARG, turn line truncation on if ARG is positive."
7113   (interactive "P")
7114   (setq truncate-lines
7115         (if (null arg) (not truncate-lines)
7116           (> (prefix-numeric-value arg) 0)))
7117   (redraw-display))
7118
7119 (defun gnus-summary-find-for-reselect ()
7120   "Return the number of an article to stay on across a reselect.
7121 The current article is considered, then following articles, then previous
7122 articles.  An article is sought which is not canceled and isn't a temporary
7123 insertion from another group.  If there's no such then return a dummy 0."
7124   (let (found)
7125     (dolist (rev '(nil t))
7126       (unless found      ; don't demand the reverse list if we don't need it
7127         (let ((data (gnus-data-find-list
7128                      (gnus-summary-article-number) (gnus-data-list rev))))
7129           (while (and data (not found))
7130             (if (and (< 0 (gnus-data-number (car data)))
7131                      (not (eq gnus-canceled-mark (gnus-data-mark (car data)))))
7132                 (setq found (gnus-data-number (car data))))
7133             (setq data (cdr data))))))
7134     (or found 0)))
7135
7136 (defun gnus-summary-reselect-current-group (&optional all rescan)
7137   "Exit and then reselect the current newsgroup.
7138 The prefix argument ALL means to select all articles."
7139   (interactive "P")
7140   (when (gnus-ephemeral-group-p gnus-newsgroup-name)
7141     (error "Ephemeral groups can't be reselected"))
7142   (let ((current-subject (gnus-summary-find-for-reselect))
7143         (group gnus-newsgroup-name))
7144     (setq gnus-newsgroup-begin nil)
7145     (gnus-summary-exit nil 'leave-hidden)
7146     ;; We have to adjust the point of group mode buffer because
7147     ;; point was moved to the next unread newsgroup by exiting.
7148     (gnus-summary-jump-to-group group)
7149     (when rescan
7150       (save-excursion
7151         (gnus-group-get-new-news-this-group 1)))
7152     (gnus-group-read-group all t)
7153     (gnus-summary-goto-subject current-subject nil t)))
7154
7155 (defun gnus-summary-rescan-group (&optional all)
7156   "Exit the newsgroup, ask for new articles, and select the newsgroup."
7157   (interactive "P")
7158   (let ((config gnus-current-window-configuration))
7159     (gnus-summary-reselect-current-group all t)
7160     (gnus-configure-windows config)
7161     (when (eq config 'article)
7162       (gnus-summary-select-article))))
7163
7164 (defun gnus-summary-update-info (&optional non-destructive)
7165   (save-excursion
7166     (let ((group gnus-newsgroup-name))
7167       (when group
7168         (when gnus-newsgroup-kill-headers
7169           (setq gnus-newsgroup-killed
7170                 (gnus-compress-sequence
7171                  (gnus-sorted-union
7172                   (gnus-list-range-intersection
7173                    gnus-newsgroup-unselected gnus-newsgroup-killed)
7174                   gnus-newsgroup-unreads)
7175                  t)))
7176         (unless (listp (cdr gnus-newsgroup-killed))
7177           (setq gnus-newsgroup-killed (list gnus-newsgroup-killed)))
7178         (let ((headers gnus-newsgroup-headers)
7179               (ephemeral-p (gnus-ephemeral-group-p group))
7180               info)
7181           (unless ephemeral-p
7182             (setq info (copy-sequence (gnus-get-info group))
7183                   info (delq (gnus-info-params info) info)))
7184           ;; Set the new ranges of read articles.
7185           (with-current-buffer gnus-group-buffer
7186             (gnus-undo-force-boundary))
7187           (gnus-update-read-articles
7188            group (gnus-sorted-union
7189                   gnus-newsgroup-unreads gnus-newsgroup-unselected))
7190           ;; Set the current article marks.
7191           (let ((gnus-newsgroup-scored
7192                  (if (and (not gnus-save-score)
7193                           (not non-destructive))
7194                      nil
7195                    gnus-newsgroup-scored)))
7196             (save-excursion
7197               (gnus-update-marks)))
7198           ;; Do the cross-ref thing.
7199           (when gnus-use-cross-reference
7200             (gnus-mark-xrefs-as-read group headers gnus-newsgroup-unreads))
7201           ;; Do not switch windows but change the buffer to work.
7202           (set-buffer gnus-group-buffer)
7203           (unless ephemeral-p
7204             (gnus-group-update-group
7205              group nil
7206              (equal info
7207                     (setq info (copy-sequence (gnus-get-info group))
7208                           info (delq (gnus-info-params info) info))))))))))
7209
7210 (defun gnus-summary-save-newsrc (&optional force)
7211   "Save the current number of read/marked articles in the dribble buffer.
7212 The dribble buffer will then be saved.
7213 If FORCE (the prefix), also save the .newsrc file(s)."
7214   (interactive "P")
7215   (gnus-summary-update-info t)
7216   (if force
7217       (gnus-save-newsrc-file)
7218     (gnus-dribble-save)))
7219
7220 (declare-function gnus-cache-write-active "gnus-cache" (&optional force))
7221 (declare-function gnus-article-stop-animations "gnus-art" ())
7222
7223 (defun gnus-summary-exit (&optional temporary leave-hidden)
7224   "Exit reading current newsgroup, and then return to group selection mode.
7225 `gnus-exit-group-hook' is called with no arguments if that value is non-nil."
7226   (interactive)
7227   (gnus-set-global-variables)
7228   (when (gnus-buffer-live-p gnus-article-buffer)
7229     (with-current-buffer gnus-article-buffer
7230       (mm-destroy-parts gnus-article-mime-handles)
7231       ;; Set it to nil for safety reason.
7232       (setq gnus-article-mime-handle-alist nil)
7233       (setq gnus-article-mime-handles nil)))
7234   (gnus-kill-save-kill-buffer)
7235   (gnus-async-halt-prefetch)
7236   (let* ((group gnus-newsgroup-name)
7237          (quit-config (gnus-group-quit-config gnus-newsgroup-name))
7238          (gnus-group-is-exiting-p t)
7239          (article-buffer gnus-article-buffer)
7240          (original-article-buffer gnus-original-article-buffer)
7241          (mode major-mode)
7242          (group-point nil)
7243          (buf (current-buffer))
7244          ;; `gnus-single-article-buffer' is nil buffer-locally in
7245          ;; ephemeral group of which summary buffer will be killed,
7246          ;; but the global value may be non-nil.
7247          (single-article-buffer gnus-single-article-buffer))
7248     (unless quit-config
7249       ;; Do adaptive scoring, and possibly save score files.
7250       (when gnus-newsgroup-adaptive
7251         (gnus-score-adaptive))
7252       (when gnus-use-scoring
7253         (gnus-score-save)))
7254     (gnus-run-hooks 'gnus-summary-prepare-exit-hook)
7255     (when gnus-use-cache
7256       (gnus-cache-possibly-remove-articles)
7257       (gnus-cache-save-buffers))
7258     (gnus-async-prefetch-remove-group group)
7259     (when gnus-suppress-duplicates
7260       (gnus-dup-enter-articles))
7261     (when gnus-use-trees
7262       (gnus-tree-close))
7263     (when gnus-use-cache
7264       (gnus-cache-write-active))
7265     ;; Remove entries for this group.
7266     (nnmail-purge-split-history (gnus-group-real-name group))
7267     ;; Make all changes in this group permanent.
7268     (unless quit-config
7269       (gnus-run-hooks 'gnus-exit-group-hook)
7270       (gnus-summary-update-info))
7271     (gnus-close-group group)
7272     ;; Make sure where we were, and go to next newsgroup.
7273     (when (buffer-live-p (get-buffer gnus-group-buffer))
7274       (set-buffer gnus-group-buffer))
7275     (unless quit-config
7276       (gnus-group-jump-to-group group))
7277     (gnus-run-hooks 'gnus-summary-exit-hook)
7278     (unless (or quit-config
7279                 (not gnus-summary-next-group-on-exit)
7280                 ;; If this group has disappeared from the summary
7281                 ;; buffer, don't skip forwards.
7282                 (not (string= group (gnus-group-group-name))))
7283       (gnus-group-next-unread-group 1))
7284     (setq group-point (point))
7285     (gnus-article-stop-animations)
7286     (if temporary
7287         nil                             ;Nothing to do.
7288       (set-buffer buf)
7289       (if (not gnus-kill-summary-on-exit)
7290           (progn
7291             (gnus-deaden-summary)
7292             (setq mode nil))
7293         (when (get-buffer gnus-article-buffer)
7294           (bury-buffer gnus-article-buffer))
7295         ;; Return to group mode buffer.
7296         (when (eq mode 'gnus-summary-mode)
7297           (gnus-kill-buffer buf)))
7298
7299       (setq gnus-current-select-method gnus-select-method)
7300       (when (gnus-buffer-live-p gnus-group-buffer)
7301         (set-buffer gnus-group-buffer))
7302       (if quit-config
7303           (gnus-handle-ephemeral-exit quit-config)
7304         (goto-char group-point)
7305         ;; If gnus-group-buffer is already displayed, make sure we also move
7306         ;; the cursor in the window that displays it.
7307         (let ((win (get-buffer-window (current-buffer) 0)))
7308           (if win (set-window-point win (point))))
7309         (unless leave-hidden
7310           (gnus-configure-windows 'group 'force)))
7311
7312       ;; If we have several article buffers, we kill them at exit.
7313       (unless single-article-buffer
7314         (when (gnus-buffer-live-p article-buffer)
7315           (with-current-buffer article-buffer
7316             ;; Don't kill sticky article buffers
7317             (unless (eq major-mode 'gnus-sticky-article-mode)
7318               (gnus-kill-buffer article-buffer)
7319               (setq gnus-article-current nil))))
7320         (gnus-kill-buffer original-article-buffer))
7321
7322       ;; Clear the current group name.
7323       (unless quit-config
7324         (setq gnus-newsgroup-name nil)))))
7325
7326 (declare-function gnus-stop-downloads "gnus-art" ())
7327
7328 (defalias 'gnus-summary-quit 'gnus-summary-exit-no-update)
7329 (defun gnus-summary-exit-no-update (&optional no-questions)
7330   "Quit reading current newsgroup without updating read article info."
7331   (interactive)
7332   (let* ((group gnus-newsgroup-name)
7333          (gnus-group-is-exiting-p t)
7334          (gnus-group-is-exiting-without-update-p t)
7335          (quit-config (gnus-group-quit-config group)))
7336     (when (or no-questions
7337               (gnus-ephemeral-group-p group)
7338               gnus-expert-user
7339               (gnus-y-or-n-p "Discard changes to this group and exit? "))
7340       (gnus-async-halt-prefetch)
7341       (run-hooks 'gnus-summary-prepare-exit-hook)
7342       (when (gnus-buffer-live-p gnus-article-buffer)
7343         (with-current-buffer gnus-article-buffer
7344           (gnus-article-stop-animations)
7345           (gnus-stop-downloads)
7346           (mm-destroy-parts gnus-article-mime-handles)
7347           ;; Set it to nil for safety reason.
7348           (setq gnus-article-mime-handle-alist nil)
7349           (setq gnus-article-mime-handles nil)))
7350       ;; If we have several article buffers, we kill them at exit.
7351       (unless gnus-single-article-buffer
7352         (gnus-kill-buffer gnus-article-buffer)
7353         (gnus-kill-buffer gnus-original-article-buffer)
7354         (setq gnus-article-current nil))
7355       ;; Return to the group buffer.
7356       (if (not gnus-kill-summary-on-exit)
7357           (progn
7358             (gnus-deaden-summary)
7359             (gnus-configure-windows 'group 'force))
7360         (gnus-configure-windows 'group 'force)
7361         (gnus-close-group group)
7362         (gnus-kill-buffer gnus-summary-buffer))
7363       (unless gnus-single-article-buffer
7364         (setq gnus-article-current nil))
7365       (when gnus-use-trees
7366         (gnus-tree-close))
7367       (gnus-async-prefetch-remove-group group)
7368       (when (get-buffer gnus-article-buffer)
7369         (bury-buffer gnus-article-buffer))
7370       ;; Clear the current group name.
7371       (setq gnus-newsgroup-name nil)
7372       (unless (gnus-ephemeral-group-p group)
7373         (gnus-group-update-group group nil t))
7374       (when (equal (gnus-group-group-name) group)
7375         (gnus-group-next-unread-group 1))
7376       (gnus-article-stop-animations)
7377       (when quit-config
7378         (gnus-handle-ephemeral-exit quit-config)))))
7379
7380 (defun gnus-handle-ephemeral-exit (quit-config)
7381   "Handle movement when leaving an ephemeral group.
7382 The state which existed when entering the ephemeral is reset."
7383   (if (not (buffer-live-p (car quit-config)))
7384       (when (gnus-buffer-live-p gnus-group-buffer)
7385         (gnus-configure-windows 'group 'force))
7386     (set-buffer (car quit-config))
7387     (unless (eq (cdr quit-config) 'group)
7388       (setq gnus-current-select-method
7389             (gnus-find-method-for-group gnus-newsgroup-name)))
7390     (cond ((derived-mode-p 'gnus-summary-mode)
7391            (gnus-set-global-variables))
7392           ((derived-mode-p 'gnus-article-mode)
7393            (save-current-buffer
7394              ;; The `gnus-summary-buffer' variable may point
7395              ;; to the old summary buffer when using a single
7396              ;; article buffer.
7397              (unless (gnus-buffer-live-p gnus-summary-buffer)
7398                (set-buffer gnus-group-buffer))
7399              (set-buffer gnus-summary-buffer)
7400              (gnus-set-global-variables))))
7401     (if (or (eq (cdr quit-config) 'article)
7402             (eq (cdr quit-config) 'pick))
7403         (if (and (boundp 'gnus-pick-mode) (symbol-value 'gnus-pick-mode))
7404             (gnus-configure-windows 'pick 'force)
7405           (gnus-configure-windows (cdr quit-config) 'force))
7406       (gnus-configure-windows (cdr quit-config) 'force))
7407     (when (derived-mode-p 'gnus-summary-mode)
7408       (if (memq gnus-auto-select-on-ephemeral-exit '(next-noselect
7409                                                      next-unread-noselect))
7410           (when (zerop (cond ((eq gnus-auto-select-on-ephemeral-exit
7411                                   'next-noselect)
7412                               (gnus-summary-next-subject 1 nil t))
7413                              ((eq gnus-auto-select-on-ephemeral-exit
7414                                   'next-unread-noselect)
7415                               (gnus-summary-next-subject 1 t t))))
7416             ;; Hide the article buffer which displays the article different
7417             ;; from the one that the cursor points to in the summary buffer.
7418             (gnus-configure-windows 'summary 'force))
7419         (cond ((eq gnus-auto-select-on-ephemeral-exit 'next)
7420                (gnus-summary-next-subject 1))
7421               ((eq gnus-auto-select-on-ephemeral-exit 'next-unread)
7422                (gnus-summary-next-subject 1 t))))
7423       (gnus-summary-recenter)
7424       (gnus-summary-position-point))))
7425
7426 ;;; Dead summaries.
7427
7428 (defvar gnus-dead-summary-mode-map
7429   (let ((map (make-keymap)))
7430     (suppress-keymap map)
7431     (substitute-key-definition 'undefined 'gnus-summary-wake-up-the-dead map)
7432     (dolist (key '("\C-d" "\r" "\177" [delete]))
7433       (define-key map key 'gnus-summary-wake-up-the-dead))
7434     (dolist (key '("q" "Q"))
7435       (define-key map key 'bury-buffer))
7436     map))
7437
7438 (define-minor-mode gnus-dead-summary-mode
7439   "Minor mode for Gnus summary buffers."
7440   :lighter " Dead" :keymap gnus-dead-summary-mode-map
7441   (unless (derived-mode-p 'gnus-summary-mode)
7442     (setq gnus-dead-summary-mode nil)))
7443
7444 (defun gnus-deaden-summary ()
7445   "Make the current summary buffer into a dead summary buffer."
7446   ;; Kill any previous dead summary buffer.
7447   (when (and gnus-dead-summary
7448              (buffer-name gnus-dead-summary))
7449     (with-current-buffer gnus-dead-summary
7450       (when gnus-dead-summary-mode
7451         (kill-buffer (current-buffer)))))
7452   ;; Make this the current dead summary.
7453   (setq gnus-dead-summary (current-buffer))
7454   (gnus-dead-summary-mode 1)
7455   (let ((name (buffer-name)))
7456     (when (string-match "Summary" name)
7457       (rename-buffer
7458        (concat (substring name 0 (match-beginning 0)) "Dead "
7459                (substring name (match-beginning 0)))
7460        t)
7461       (bury-buffer))))
7462
7463 (defun gnus-kill-or-deaden-summary (buffer)
7464   "Kill or deaden the summary BUFFER."
7465   (save-excursion
7466     (when (and (buffer-name buffer)
7467                (not gnus-single-article-buffer))
7468       (with-current-buffer buffer
7469         (gnus-kill-buffer gnus-article-buffer)
7470         (gnus-kill-buffer gnus-original-article-buffer)))
7471     (cond
7472      ;; Kill the buffer.
7473      (gnus-kill-summary-on-exit
7474       (when (and gnus-use-trees
7475                  (gnus-buffer-exists-p buffer))
7476         (with-current-buffer buffer
7477           (gnus-tree-close)))
7478       (gnus-kill-buffer buffer))
7479      ;; Deaden the buffer.
7480      ((gnus-buffer-exists-p buffer)
7481       (with-current-buffer buffer
7482         (gnus-deaden-summary))))))
7483
7484 (defun gnus-summary-wake-up-the-dead (&rest args)
7485   "Wake up the dead summary buffer."
7486   (interactive)
7487   (gnus-dead-summary-mode -1)
7488   (let ((name (buffer-name)))
7489     (when (string-match "Dead " name)
7490       (rename-buffer
7491        (concat (substring name 0 (match-beginning 0))
7492                (substring name (match-end 0)))
7493        t)))
7494   (gnus-message 3 "This dead summary is now alive again"))
7495
7496 ;; Suggested by Per Abrahamsen <amanda@iesd.auc.dk>.
7497 (defun gnus-summary-describe-group (&optional force)
7498   "Describe the current newsgroup."
7499   (interactive "P")
7500   (gnus-group-describe-group force gnus-newsgroup-name))
7501
7502 (defun gnus-summary-describe-briefly ()
7503   "Describe summary mode commands briefly."
7504   (interactive)
7505   (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")))
7506
7507 ;; Walking around group mode buffer from summary mode.
7508
7509 (defun gnus-summary-next-group (&optional no-article target-group backward)
7510   "Exit current newsgroup and then select next unread newsgroup.
7511 If prefix argument NO-ARTICLE is non-nil, no article is selected
7512 initially.  If TARGET-GROUP, go to this group.  If BACKWARD, go to
7513 previous group instead."
7514   (interactive "P")
7515   ;; Stop pre-fetching.
7516   (gnus-async-halt-prefetch)
7517   (let ((current-group gnus-newsgroup-name)
7518         (current-buffer (current-buffer))
7519         entered)
7520     ;; First we semi-exit this group to update Xrefs and all variables.
7521     ;; We can't do a real exit, because the window conf must remain
7522     ;; the same in case the user is prompted for info, and we don't
7523     ;; want the window conf to change before that...
7524     (gnus-summary-exit t)
7525     (while (not entered)
7526       ;; Then we find what group we are supposed to enter.
7527       (set-buffer gnus-group-buffer)
7528       (gnus-group-jump-to-group current-group)
7529       (setq target-group
7530             (or target-group
7531                 (if (eq gnus-keep-same-level 'best)
7532                     (gnus-summary-best-group gnus-newsgroup-name)
7533                   (gnus-summary-search-group backward gnus-keep-same-level))))
7534       (if (not target-group)
7535           ;; There are no further groups, so we return to the group
7536           ;; buffer.
7537           (progn
7538             (gnus-message 5 "Returning to the group buffer")
7539             (setq entered t)
7540             (when (gnus-buffer-live-p current-buffer)
7541               (set-buffer current-buffer)
7542               (gnus-summary-exit))
7543             (gnus-run-hooks 'gnus-group-no-more-groups-hook))
7544         ;; We try to enter the target group.
7545         (gnus-group-jump-to-group target-group)
7546         (let ((unreads (gnus-group-group-unread)))
7547           (if (and (or (eq t unreads)
7548                        (and unreads (not (zerop unreads))))
7549                    (gnus-summary-read-group
7550                     target-group nil no-article
7551                     (and (buffer-name current-buffer) current-buffer)
7552                     nil backward))
7553               (setq entered t)
7554             (setq current-group target-group
7555                   target-group nil)))))))
7556
7557 (defun gnus-summary-prev-group (&optional no-article)
7558   "Exit current newsgroup and then select previous unread newsgroup.
7559 If prefix argument NO-ARTICLE is non-nil, no article is selected initially."
7560   (interactive "P")
7561   (gnus-summary-next-group no-article nil t))
7562
7563 ;; Walking around summary lines.
7564
7565 (defun gnus-summary-first-subject (&optional unread undownloaded unseen)
7566   "Go to the first subject satisfying any non-nil constraint.
7567 If UNREAD is non-nil, the article should be unread.
7568 If UNDOWNLOADED is non-nil, the article should be undownloaded.
7569 If UNSEEN is non-nil, the article should be unseen as well as unread.
7570 Returns the article selected or nil if there are no matching articles."
7571   (interactive "P")
7572   (cond
7573    ;; Empty summary.
7574    ((null gnus-newsgroup-data)
7575     (gnus-message 3 "No articles in the group")
7576     nil)
7577    ;; Pick the first article.
7578    ((not (or unread undownloaded unseen))
7579     (goto-char (gnus-data-pos (car gnus-newsgroup-data)))
7580     (gnus-data-number (car gnus-newsgroup-data)))
7581    ;; Find the first unread article.
7582    (t
7583     (let ((data gnus-newsgroup-data))
7584       (while (and data
7585                   (let ((num (gnus-data-number (car data))))
7586                     (or (memq num gnus-newsgroup-unfetched)
7587                         (not (or (and unread
7588                                       (memq num gnus-newsgroup-unreads))
7589                                  (and undownloaded
7590                                       (memq num gnus-newsgroup-undownloaded))
7591                                  (and unseen
7592                                       (memq num gnus-newsgroup-unseen)
7593                                       (memq num gnus-newsgroup-unreads)))))))
7594         (setq data (cdr data)))
7595       (prog1
7596           (if data
7597               (progn
7598                 (goto-char (gnus-data-pos (car data)))
7599                 (gnus-data-number (car data)))
7600             (gnus-message 3 "No more%s articles"
7601                           (let* ((r (when unread " unread"))
7602                                  (d (when undownloaded " undownloaded"))
7603                                  (s (when unseen " unseen"))
7604                                  (l (delq nil (list r d s))))
7605                             (cond ((= 3 (length l))
7606                                    (concat r "," d ", or" s))
7607                                   ((= 2 (length l))
7608                                    (concat (car l) ", or" (cadr l)))
7609                                   ((= 1 (length l))
7610                                    (car l))
7611                                   (t
7612                                    ""))))
7613             nil
7614             )
7615         (gnus-summary-position-point))))))
7616
7617 (defun gnus-summary-next-subject (n &optional unread dont-display)
7618   "Go to next N'th summary line.
7619 If N is negative, go to the previous N'th subject line.
7620 If UNREAD is non-nil, only unread articles are selected.
7621 The difference between N and the actual number of steps taken is
7622 returned."
7623   (interactive "p")
7624   (let ((backward (< n 0))
7625         (n (abs n)))
7626     (while (and (> n 0)
7627                 (if backward
7628                     (gnus-summary-find-prev unread)
7629                   (gnus-summary-find-next unread)))
7630       (unless (zerop (setq n (1- n)))
7631         (gnus-summary-show-thread)))
7632     (when (/= 0 n)
7633       (gnus-message 7 "No more%s articles"
7634                     (if unread " unread" "")))
7635     (unless dont-display
7636       (gnus-summary-recenter)
7637       (gnus-summary-position-point))
7638     n))
7639
7640 (defun gnus-summary-next-unread-subject (n)
7641   "Go to next N'th unread summary line."
7642   (interactive "p")
7643   (gnus-summary-next-subject n t))
7644
7645 (defun gnus-summary-prev-subject (n &optional unread)
7646   "Go to previous N'th summary line.
7647 If optional argument UNREAD is non-nil, only unread article is selected."
7648   (interactive "p")
7649   (gnus-summary-next-subject (- n) unread))
7650
7651 (defun gnus-summary-prev-unread-subject (n)
7652   "Go to previous N'th unread summary line."
7653   (interactive "p")
7654   (gnus-summary-next-subject (- n) t))
7655
7656 (defun gnus-summary-goto-subjects (articles)
7657   "Insert the subject header for ARTICLES in the current buffer."
7658   (save-excursion
7659     (dolist (article articles)
7660       (gnus-summary-goto-subject article t)))
7661   (gnus-summary-limit (append articles gnus-newsgroup-limit))
7662   (gnus-summary-position-point))
7663
7664 (defun gnus-summary-goto-subject (article &optional force silent)
7665   "Go to the subject line of ARTICLE.
7666 If FORCE, also allow jumping to articles not currently shown."
7667   (interactive "nArticle number: ")
7668   (unless (numberp article)
7669     (error "Article %s is not a number" article))
7670   (let ((b (point))
7671         (data (gnus-data-find article)))
7672     ;; We read in the article if we have to.
7673     (and (not data)
7674          force
7675          (gnus-summary-insert-subject
7676           article
7677           (if (or (numberp force) (vectorp force)) force)
7678           t)
7679          (setq data (gnus-data-find article)))
7680     (goto-char b)
7681     (if (not data)
7682         (progn
7683           (unless silent
7684             (gnus-message 3 "Can't find article %d" article))
7685           nil)
7686       (let ((pt (gnus-data-pos data)))
7687         (goto-char pt)
7688         (gnus-summary-set-article-display-arrow pt))
7689       (gnus-summary-position-point)
7690       article)))
7691
7692 ;; Walking around summary lines with displaying articles.
7693
7694 (defun gnus-summary-expand-window (&optional arg)
7695   "Make the summary buffer take up the entire Emacs frame.
7696 Given a prefix, will force an `article' buffer configuration."
7697   (interactive "P")
7698   (if arg
7699       (gnus-configure-windows 'article 'force)
7700     (gnus-configure-windows 'summary 'force)))
7701
7702 (defun gnus-summary-display-article (article &optional all-header)
7703   "Display ARTICLE in article buffer."
7704   (unless (and (gnus-buffer-live-p gnus-article-buffer)
7705                (with-current-buffer gnus-article-buffer
7706                  (derived-mode-p 'gnus-article-mode)))
7707     (gnus-article-setup-buffer))
7708   (gnus-set-global-variables)
7709   (with-current-buffer gnus-article-buffer
7710     (setq gnus-article-charset gnus-newsgroup-charset)
7711     (setq gnus-article-ignored-charsets gnus-newsgroup-ignored-charsets)
7712     (mm-enable-multibyte))
7713   (if (null article)
7714       nil
7715     (prog1
7716         (if gnus-summary-display-article-function
7717             (funcall gnus-summary-display-article-function article all-header)
7718           (gnus-article-prepare article all-header))
7719       (gnus-run-hooks 'gnus-select-article-hook)
7720       (when (and gnus-current-article
7721                  (not (zerop gnus-current-article)))
7722         (gnus-summary-goto-subject gnus-current-article))
7723       (gnus-summary-recenter)
7724       (when (and gnus-use-trees gnus-show-threads)
7725         (gnus-possibly-generate-tree article)
7726         (gnus-highlight-selected-tree article))
7727       ;; Successfully display article.
7728       (gnus-article-set-window-start
7729        (cdr (assq article gnus-newsgroup-bookmarks))))))
7730
7731 (defun gnus-summary-select-article (&optional all-headers force pseudo article)
7732   "Select the current article.
7733 If ALL-HEADERS is non-nil, show all header fields.  If FORCE is
7734 non-nil, the article will be re-fetched even if it already present in
7735 the article buffer.  If PSEUDO is non-nil, pseudo-articles will also
7736 be displayed."
7737   ;; Make sure we are in the summary buffer to work around bbdb bug.
7738   (unless (derived-mode-p 'gnus-summary-mode)
7739     (set-buffer gnus-summary-buffer))
7740   (let ((article (or article (gnus-summary-article-number)))
7741         (all-headers (not (not all-headers))) ;Must be t or nil.
7742         gnus-summary-display-article-function)
7743     (and (not pseudo)
7744          (gnus-summary-article-pseudo-p article)
7745          (error "This is a pseudo-article"))
7746     (with-current-buffer gnus-summary-buffer
7747       (if (or (and gnus-single-article-buffer
7748                    (or (null gnus-current-article)
7749                        (null gnus-article-current)
7750                        (null (get-buffer gnus-article-buffer))
7751                        (not (eq article (cdr gnus-article-current)))
7752                        (not (equal (car gnus-article-current)
7753                                    gnus-newsgroup-name))
7754                        (not (get-buffer gnus-original-article-buffer))))
7755               (and (not gnus-single-article-buffer)
7756                    (or (null gnus-current-article)
7757                        (not (get-buffer gnus-original-article-buffer))
7758                        (not (eq gnus-current-article article))))
7759               force)
7760           ;; The requested article is different from the current article.
7761           (progn
7762             (gnus-summary-display-article article all-headers)
7763             (when (gnus-buffer-live-p gnus-article-buffer)
7764               (with-current-buffer gnus-article-buffer
7765                 (if (not gnus-article-decoded-p) ;; a local variable
7766                     (mm-disable-multibyte))))
7767             (gnus-article-set-window-start
7768              (cdr (assq article gnus-newsgroup-bookmarks)))
7769             article)
7770         'old))))
7771
7772 (defun gnus-summary-force-verify-and-decrypt ()
7773   "Display buttons for signed/encrypted parts and verify/decrypt them."
7774   (interactive)
7775   (let ((mm-verify-option 'known)
7776         (mm-decrypt-option 'known)
7777         (gnus-article-emulate-mime t)
7778         (gnus-buttonized-mime-types (append (list "multipart/signed"
7779                                                   "multipart/encrypted")
7780                                             gnus-buttonized-mime-types)))
7781     (gnus-summary-select-article nil 'force)))
7782
7783 (defun gnus-summary-next-article (&optional unread subject backward push)
7784   "Select the next article.
7785 If UNREAD, only unread articles are selected.
7786 If SUBJECT, only articles with SUBJECT are selected.
7787 If BACKWARD, the previous article is selected instead of the next."
7788   (interactive "P")
7789   ;; Make sure we are in the summary buffer.
7790   (unless (derived-mode-p 'gnus-summary-mode)
7791     (set-buffer gnus-summary-buffer))
7792   (cond
7793    ;; Is there such an article?
7794    ((and (gnus-summary-search-forward unread subject backward)
7795          (or (gnus-summary-display-article (gnus-summary-article-number))
7796              (eq (gnus-summary-article-mark) gnus-canceled-mark)))
7797     (gnus-summary-position-point))
7798    ;; If not, we try the first unread, if that is wanted.
7799    ((and subject
7800          gnus-auto-select-same
7801          (gnus-summary-first-unread-article))
7802     (gnus-summary-position-point)
7803     (gnus-message 6 "Wrapped"))
7804    ;; Try to get next/previous article not displayed in this group.
7805    ((and gnus-auto-extend-newsgroup
7806          (not unread) (not subject))
7807     (gnus-summary-goto-article
7808      (if backward (1- gnus-newsgroup-begin) (1+ gnus-newsgroup-end))
7809      nil (count-lines (point-min) (point))))
7810    ;; Go to next/previous group.
7811    (t
7812     (unless (gnus-ephemeral-group-p gnus-newsgroup-name)
7813       (gnus-summary-jump-to-group gnus-newsgroup-name))
7814     (let ((cmd (if (featurep 'xemacs)
7815                    last-command-char
7816                  last-command-event))
7817           (point
7818            (with-current-buffer gnus-group-buffer
7819              (point)))
7820           (current-summary (current-buffer))
7821           (group
7822            (if (eq gnus-keep-same-level 'best)
7823                (gnus-summary-best-group gnus-newsgroup-name)
7824              (gnus-summary-search-group backward gnus-keep-same-level))))
7825       ;; Select next unread newsgroup automagically.
7826       (cond
7827        ((or (not gnus-auto-select-next)
7828             (not cmd))
7829         (gnus-message 7 "No more%s articles" (if unread " unread" "")))
7830        ((or (eq gnus-auto-select-next 'quietly)
7831             (and (eq gnus-auto-select-next 'slightly-quietly)
7832                  push)
7833             (and (eq gnus-auto-select-next 'almost-quietly)
7834                  (gnus-summary-last-article-p)))
7835         ;; Select quietly.
7836         (if (gnus-ephemeral-group-p gnus-newsgroup-name)
7837             (gnus-summary-exit)
7838           (gnus-message 7 "No more%s articles (%s)..."
7839                         (if unread " unread" "")
7840                         (if group (concat "selecting " group)
7841                           "exiting"))
7842           (gnus-summary-next-group nil group backward)))
7843        (t
7844         (when (gnus-key-press-event-p last-input-event)
7845           ;; Somehow or other, we may now have selected a different
7846           ;; window.  Make point go back to the summary buffer.
7847           (when (eq current-summary (current-buffer))
7848             ;; FIXME: This burps when get-buffer-window returns nil.
7849             (select-window (get-buffer-window current-summary 0)))
7850           (gnus-summary-walk-group-buffer
7851            gnus-newsgroup-name cmd unread backward point))))))))
7852
7853 (defun gnus-summary-walk-group-buffer (from-group cmd unread backward start)
7854   (let ((keystrokes '((?\C-n (gnus-group-next-unread-group 1))
7855                       (?\C-p (gnus-group-prev-unread-group 1))))
7856         (cursor-in-echo-area t)
7857         keve key group ended prompt)
7858     (with-current-buffer gnus-group-buffer
7859       (goto-char start)
7860       (setq group
7861             (if (eq gnus-keep-same-level 'best)
7862                 (gnus-summary-best-group gnus-newsgroup-name)
7863               (gnus-summary-search-group backward gnus-keep-same-level))))
7864     (while (not ended)
7865       (setq prompt
7866             (format
7867              "No more%s articles%s " (if unread " unread" "")
7868              (if (and group
7869                       (not (gnus-ephemeral-group-p gnus-newsgroup-name)))
7870                  (format " (Type %s for %s [%s])"
7871                          (single-key-description cmd)
7872                          (gnus-group-decoded-name group)
7873                          (gnus-group-unread group))
7874                (format " (Type %s to exit %s)"
7875                        (single-key-description cmd)
7876                        (gnus-group-decoded-name gnus-newsgroup-name)))))
7877       ;; Confirm auto selection.
7878       (setq key (car (setq keve (gnus-read-event-char prompt)))
7879             ended t)
7880       (cond
7881        ((assq key keystrokes)
7882         (let ((obuf (current-buffer)))
7883           (switch-to-buffer gnus-group-buffer)
7884           (when group
7885             (gnus-group-jump-to-group group))
7886           (eval (cadr (assq key keystrokes)))
7887           (setq group (gnus-group-group-name))
7888           (switch-to-buffer obuf))
7889         (setq ended nil))
7890        ((equal key cmd)
7891         (if (or (not group)
7892                 (gnus-ephemeral-group-p gnus-newsgroup-name))
7893             (gnus-summary-exit)
7894           (gnus-summary-next-group nil group backward)))
7895        (t
7896         (push (cdr keve) unread-command-events))))))
7897
7898 (defun gnus-summary-next-unread-article ()
7899   "Select unread article after current one."
7900   (interactive)
7901   (gnus-summary-next-article
7902    (or (not (eq gnus-summary-goto-unread 'never))
7903        (gnus-summary-last-article-p (gnus-summary-article-number)))
7904    (and gnus-auto-select-same
7905         (gnus-summary-article-subject))))
7906
7907 (defun gnus-summary-prev-article (&optional unread subject)
7908   "Select the article before the current one.
7909 If UNREAD is non-nil, only unread articles are selected."
7910   (interactive "P")
7911   (gnus-summary-next-article unread subject t))
7912
7913 (defun gnus-summary-prev-unread-article ()
7914   "Select unread article before current one."
7915   (interactive)
7916   (gnus-summary-prev-article
7917    (or (not (eq gnus-summary-goto-unread 'never))
7918        (gnus-summary-first-article-p (gnus-summary-article-number)))
7919    (and gnus-auto-select-same
7920         (gnus-summary-article-subject))))
7921
7922 (declare-function gnus-article-only-boring-p "gnus-art" ())
7923
7924 (defun gnus-summary-next-page (&optional lines circular stop)
7925   "Show next page of the selected article.
7926 If at the end of the current article, select the next article.
7927 LINES says how many lines should be scrolled up.
7928
7929 If CIRCULAR is non-nil, go to the start of the article instead of
7930 selecting the next article when reaching the end of the current
7931 article.
7932
7933 If STOP is non-nil, just stop when reaching the end of the message.
7934
7935 Also see the variable `gnus-article-skip-boring'."
7936   (interactive "P")
7937   (gnus-set-global-variables)
7938   (let ((article (gnus-summary-article-number))
7939         (article-window (get-buffer-window gnus-article-buffer t))
7940         endp)
7941     ;; If the buffer is empty, we have no article.
7942     (unless article
7943       (error "No article to select"))
7944     (gnus-configure-windows 'article)
7945     (if (eq (cdr (assq article gnus-newsgroup-reads)) gnus-canceled-mark)
7946         (if (and (eq gnus-summary-goto-unread 'never)
7947                  (not (gnus-summary-last-article-p article)))
7948             (gnus-summary-next-article)
7949           (gnus-summary-next-unread-article))
7950       (if (or (null gnus-current-article)
7951               (null gnus-article-current)
7952               (/= article (cdr gnus-article-current))
7953               (not (equal (car gnus-article-current) gnus-newsgroup-name)))
7954           ;; Selected subject is different from current article's.
7955           (gnus-summary-display-article article)
7956         (when article-window
7957           (gnus-eval-in-buffer-window gnus-article-buffer
7958             (setq endp (or (gnus-article-next-page lines)
7959                            (gnus-article-only-boring-p))))
7960           (when endp
7961             (cond ((or stop gnus-summary-stop-at-end-of-message)
7962                    (gnus-message 3 "End of message"))
7963                   (circular
7964                    (gnus-summary-beginning-of-article))
7965                   (lines
7966                    (gnus-message 3 "End of message"))
7967                   ((null lines)
7968                    (if (and (eq gnus-summary-goto-unread 'never)
7969                             (not (gnus-summary-last-article-p article)))
7970                        (gnus-summary-next-article)
7971                      (gnus-summary-next-unread-article))))))))
7972     (gnus-summary-recenter)
7973     (gnus-summary-position-point)))
7974
7975 (defun gnus-summary-prev-page (&optional lines move)
7976   "Show previous page of selected article.
7977 Argument LINES specifies lines to be scrolled down.
7978 If MOVE, move to the previous unread article if point is at
7979 the beginning of the buffer."
7980   (interactive "P")
7981   (let ((article (gnus-summary-article-number))
7982         (article-window (get-buffer-window gnus-article-buffer t))
7983         endp)
7984     (gnus-configure-windows 'article)
7985     (if (or (null gnus-current-article)
7986             (null gnus-article-current)
7987             (/= article (cdr gnus-article-current))
7988             (not (equal (car gnus-article-current) gnus-newsgroup-name)))
7989         ;; Selected subject is different from current article's.
7990         (gnus-summary-display-article article)
7991       (gnus-summary-recenter)
7992       (when article-window
7993         (gnus-eval-in-buffer-window gnus-article-buffer
7994           (setq endp (gnus-article-prev-page lines)))
7995         (when (and move endp)
7996           (cond (lines
7997                  (gnus-message 3 "Beginning of message"))
7998                 ((null lines)
7999                  (if (and (eq gnus-summary-goto-unread 'never)
8000                           (not (gnus-summary-first-article-p article)))
8001                      (gnus-summary-prev-article)
8002                    (gnus-summary-prev-unread-article))))))))
8003   (gnus-summary-position-point))
8004
8005 (defun gnus-summary-prev-page-or-article (&optional lines)
8006   "Show previous page of selected article.
8007 Argument LINES specifies lines to be scrolled down.
8008 If at the beginning of the article, go to the next article."
8009   (interactive "P")
8010   (gnus-summary-prev-page lines t))
8011
8012 (defun gnus-summary-scroll-up (lines)
8013   "Scroll up (or down) one line current article.
8014 Argument LINES specifies lines to be scrolled up (or down if negative).
8015 If no article is selected, then the current article will be selected first."
8016   (interactive "p")
8017   (gnus-configure-windows 'article)
8018   (gnus-summary-show-thread)
8019   (when (eq (gnus-summary-select-article nil nil 'pseudo) 'old)
8020     (gnus-eval-in-buffer-window gnus-article-buffer
8021       (cond ((> lines 0)
8022              (when (gnus-article-next-page lines)
8023                (gnus-message 3 "End of message")))
8024             ((< lines 0)
8025              (gnus-article-prev-page (- lines))))))
8026   (gnus-summary-recenter)
8027   (gnus-summary-position-point))
8028
8029 (defun gnus-summary-scroll-down (lines)
8030   "Scroll down (or up) one line current article.
8031 Argument LINES specifies lines to be scrolled down (or up if negative).
8032 If no article is selected, then the current article will be selected first."
8033   (interactive "p")
8034   (gnus-summary-scroll-up (- lines)))
8035
8036 (defun gnus-summary-next-same-subject ()
8037   "Select next article which has the same subject as current one."
8038   (interactive)
8039   (gnus-summary-next-article nil (gnus-summary-article-subject)))
8040
8041 (defun gnus-summary-prev-same-subject ()
8042   "Select previous article which has the same subject as current one."
8043   (interactive)
8044   (gnus-summary-prev-article nil (gnus-summary-article-subject)))
8045
8046 (defun gnus-summary-next-unread-same-subject ()
8047   "Select next unread article which has the same subject as current one."
8048   (interactive)
8049   (gnus-summary-next-article t (gnus-summary-article-subject)))
8050
8051 (defun gnus-summary-prev-unread-same-subject ()
8052   "Select previous unread article which has the same subject as current one."
8053   (interactive)
8054   (gnus-summary-prev-article t (gnus-summary-article-subject)))
8055
8056 (defun gnus-summary-first-unread-article ()
8057   "Select the first unread article.
8058 Return nil if there are no unread articles."
8059   (interactive)
8060   (prog1
8061       (when (gnus-summary-first-subject t)
8062         (gnus-summary-show-thread)
8063         (gnus-summary-first-subject t)
8064         (gnus-summary-display-article (gnus-summary-article-number)))
8065     (gnus-summary-position-point)))
8066
8067 (defun gnus-summary-first-unread-subject ()
8068   "Place the point on the subject line of the first unread article.
8069 Return nil if there are no unread articles."
8070   (interactive)
8071   (prog1
8072       (when (gnus-summary-first-subject t)
8073         (gnus-summary-show-thread)
8074         (gnus-summary-first-subject t))
8075     (gnus-summary-position-point)))
8076
8077 (defun gnus-summary-first-unseen-subject ()
8078   "Place the point on the subject line of the first unseen article.
8079 Return nil if there are no unseen articles."
8080   (interactive)
8081   (prog1
8082       (when (gnus-summary-first-subject nil nil t)
8083         (gnus-summary-show-thread)
8084         (gnus-summary-first-subject nil nil t))
8085     (gnus-summary-position-point)))
8086
8087 (defun gnus-summary-first-unseen-or-unread-subject ()
8088   "Place the point on the subject line of the first unseen and unread article.
8089 If all article have been seen, on the subject line of the first unread
8090 article."
8091   (interactive)
8092   (prog1
8093       (unless (when (gnus-summary-first-subject nil nil t)
8094                 (gnus-summary-show-thread)
8095                 (gnus-summary-first-subject nil nil t))
8096         (when (gnus-summary-first-subject t)
8097           (gnus-summary-show-thread)
8098           (gnus-summary-first-subject t)))
8099     (gnus-summary-position-point)))
8100
8101 (defun gnus-summary-first-article ()
8102   "Select the first article.
8103 Return nil if there are no articles."
8104   (interactive)
8105   (prog1
8106       (when (gnus-summary-first-subject)
8107         (gnus-summary-show-thread)
8108         (gnus-summary-first-subject)
8109         (gnus-summary-display-article (gnus-summary-article-number)))
8110     (gnus-summary-position-point)))
8111
8112 (defun gnus-summary-best-unread-article (&optional arg)
8113   "Select the unread article with the highest score.
8114 If given a prefix argument, select the next unread article that has a
8115 score higher than the default score."
8116   (interactive "P")
8117   (let ((article (if arg
8118                      (gnus-summary-better-unread-subject)
8119                    (gnus-summary-best-unread-subject))))
8120     (if article
8121         (gnus-summary-goto-article article)
8122       (error "No unread articles"))))
8123
8124 (defun gnus-summary-best-unread-subject ()
8125   "Select the unread subject with the highest score."
8126   (interactive)
8127   (let ((best -1000000)
8128         (data gnus-newsgroup-data)
8129         article score)
8130     (while data
8131       (and (gnus-data-unread-p (car data))
8132            (> (setq score
8133                     (gnus-summary-article-score (gnus-data-number (car data))))
8134               best)
8135            (setq best score
8136                  article (gnus-data-number (car data))))
8137       (setq data (cdr data)))
8138     (when article
8139       (gnus-summary-goto-subject article))
8140     (gnus-summary-position-point)
8141     article))
8142
8143 (defun gnus-summary-better-unread-subject ()
8144   "Select the first unread subject that has a score over the default score."
8145   (interactive)
8146   (let ((data gnus-newsgroup-data)
8147         article score)
8148     (while (and (setq article (gnus-data-number (car data)))
8149                 (or (gnus-data-read-p (car data))
8150                     (not (> (gnus-summary-article-score article)
8151                             gnus-summary-default-score))))
8152       (setq data (cdr data)))
8153     (when article
8154       (gnus-summary-goto-subject article))
8155     (gnus-summary-position-point)
8156     article))
8157
8158 (defun gnus-summary-last-subject ()
8159   "Go to the last displayed subject line in the group."
8160   (let ((article (gnus-data-number (car (gnus-data-list t)))))
8161     (when article
8162       (gnus-summary-goto-subject article))))
8163
8164 (defun gnus-summary-goto-article (article &optional all-headers force)
8165   "Fetch ARTICLE (article number or Message-ID) and display it if it exists.
8166 If ALL-HEADERS is non-nil, no header lines are hidden.
8167 If FORCE, go to the article even if it isn't displayed.  If FORCE
8168 is a number, it is the line the article is to be displayed on."
8169   (interactive
8170    (list
8171     (gnus-completing-read
8172      "Article number or Message-ID"
8173      (mapcar 'int-to-string gnus-newsgroup-limit))
8174     current-prefix-arg
8175     t))
8176   (prog1
8177       (if (and (stringp article)
8178                (string-match "@\\|%40" article))
8179           (gnus-summary-refer-article article)
8180         (when (stringp article)
8181           (setq article (string-to-number article)))
8182         (if (gnus-summary-goto-subject article force)
8183             (gnus-summary-display-article article all-headers)
8184           (gnus-message 4 "Couldn't go to article %s" article) nil))
8185     (gnus-summary-position-point)))
8186
8187 (defun gnus-summary-goto-last-article ()
8188   "Go to the previously read article."
8189   (interactive)
8190   (prog1
8191       (when gnus-last-article
8192         (gnus-summary-goto-article gnus-last-article nil t))
8193     (gnus-summary-position-point)))
8194
8195 (defun gnus-summary-pop-article (number)
8196   "Pop one article off the history and go to the previous.
8197 NUMBER articles will be popped off."
8198   (interactive "p")
8199   (let (to)
8200     (setq gnus-newsgroup-history
8201           (cdr (setq to (nthcdr number gnus-newsgroup-history))))
8202     (if to
8203         (gnus-summary-goto-article (car to) nil t)
8204       (error "Article history empty")))
8205   (gnus-summary-position-point))
8206
8207 ;; Summary commands and functions for limiting the summary buffer.
8208
8209 (defun gnus-summary-limit-to-articles (n)
8210   "Limit the summary buffer to the next N articles.
8211 If not given a prefix, use the process marked articles instead."
8212   (interactive "P")
8213   (prog1
8214       (let ((articles (gnus-summary-work-articles n)))
8215         (setq gnus-newsgroup-processable nil)
8216         (gnus-summary-limit articles))
8217     (gnus-summary-position-point)))
8218
8219 (defun gnus-summary-pop-limit (&optional total)
8220   "Restore the previous limit.
8221 If given a prefix, remove all limits."
8222   (interactive "P")
8223   (when total
8224     (setq gnus-newsgroup-limits
8225           (list (mapcar (lambda (h) (mail-header-number h))
8226                         gnus-newsgroup-headers))))
8227   (unless gnus-newsgroup-limits
8228     (error "No limit to pop"))
8229   (prog1
8230       (gnus-summary-limit nil 'pop)
8231     (gnus-summary-position-point)))
8232
8233 (defun gnus-summary-limit-to-subject (subject &optional header not-matching)
8234   "Limit the summary buffer to articles that have subjects that match a regexp.
8235 If NOT-MATCHING, excluding articles that have subjects that match a regexp."
8236   (interactive
8237    (list (read-string (if current-prefix-arg
8238                           "Exclude subject (regexp): "
8239                         "Limit to subject (regexp): "))
8240          nil current-prefix-arg))
8241   (unless header
8242     (setq header "subject"))
8243   (when (not (equal "" subject))
8244     (prog1
8245         (let ((articles (gnus-summary-find-matching
8246                          (or header "subject") subject 'all nil nil
8247                          not-matching)))
8248           (unless articles
8249             (error "Found no matches for \"%s\"" subject))
8250           (gnus-summary-limit articles))
8251       (gnus-summary-position-point))))
8252
8253 (defun gnus-summary-limit-to-author (from &optional not-matching)
8254   "Limit the summary buffer to articles that have authors that match a regexp.
8255 If NOT-MATCHING, excluding articles that have authors that match a regexp."
8256   (interactive
8257    (list (let* ((header (gnus-summary-article-header))
8258                 (default (and header (car (mail-header-parse-address
8259                                            (mail-header-from header))))))
8260            (read-string (concat (if current-prefix-arg
8261                                     "Exclude author (regexp"
8262                                   "Limit to author (regexp")
8263                                 (if default
8264                                     (concat ", default \"" default "\"): ")
8265                                   "): "))
8266                         nil nil
8267                         default))
8268          current-prefix-arg))
8269   (gnus-summary-limit-to-subject from "from" not-matching))
8270
8271 (defun gnus-summary-limit-to-recipient (recipient &optional not-matching)
8272   "Limit the summary buffer to articles with the given RECIPIENT.
8273
8274 If NOT-MATCHING, exclude RECIPIENT.
8275
8276 To and Cc headers are checked.  You need to include them in
8277 `nnmail-extra-headers'."
8278   ;; Unlike `rmail-summary-by-recipients', doesn't include From.
8279   (interactive
8280    (list (read-string (format "%s recipient (regexp): "
8281                               (if current-prefix-arg "Exclude" "Limit to")))
8282          current-prefix-arg))
8283   (when (not (equal "" recipient))
8284     (prog1 (let* ((to
8285                    (if (memq 'To nnmail-extra-headers)
8286                        (gnus-summary-find-matching
8287                         (cons 'extra 'To) recipient 'all nil nil
8288                         not-matching)
8289                      (gnus-message
8290                       1 "`To' isn't present in `nnmail-extra-headers'")
8291                      (sit-for 1)
8292                      nil))
8293                   (cc
8294                    (if (memq 'Cc nnmail-extra-headers)
8295                        (gnus-summary-find-matching
8296                         (cons 'extra 'Cc) recipient 'all nil nil
8297                         not-matching)
8298                      (gnus-message
8299                       1 "`Cc' isn't present in `nnmail-extra-headers'")
8300                      (sit-for 1)
8301                      nil))
8302                   (articles
8303                    (if not-matching
8304                        ;; We need the numbers that are in both lists:
8305                        (mapcar (lambda (a)
8306                                  (and (memq a to) a))
8307                                cc)
8308                      (nconc to cc))))
8309              (unless articles
8310                (error "Found no matches for \"%s\"" recipient))
8311              (gnus-summary-limit articles))
8312       (gnus-summary-position-point))))
8313
8314 (defun gnus-summary-limit-to-address (address &optional not-matching)
8315   "Limit the summary buffer to articles with the given ADDRESS.
8316
8317 If NOT-MATCHING, exclude ADDRESS.
8318
8319 To, Cc and From headers are checked.  You need to include `To' and `Cc'
8320 in `nnmail-extra-headers'."
8321   (interactive
8322    (list (read-string (format "%s address (regexp): "
8323                               (if current-prefix-arg "Exclude" "Limit to")))
8324          current-prefix-arg))
8325   (when (not (equal "" address))
8326     (prog1 (let* ((to
8327                    (if (memq 'To nnmail-extra-headers)
8328                        (gnus-summary-find-matching
8329                         (cons 'extra 'To) address 'all nil nil
8330                         not-matching)
8331                      (gnus-message
8332                       1 "`To' isn't present in `nnmail-extra-headers'")
8333                      (sit-for 1)
8334                      t))
8335                   (cc
8336                    (if (memq 'Cc nnmail-extra-headers)
8337                        (gnus-summary-find-matching
8338                         (cons 'extra 'Cc) address 'all nil nil
8339                         not-matching)
8340                      (gnus-message
8341                       1 "`Cc' isn't present in `nnmail-extra-headers'")
8342                      (sit-for 1)
8343                      t))
8344                   (from
8345                    (gnus-summary-find-matching "from" address
8346                                                'all nil nil not-matching))
8347                   (articles
8348                    (if not-matching
8349                        ;; We need the numbers that are in all lists:
8350                        (if (eq cc t)
8351                            (if (eq to t)
8352                                from
8353                              (mapcar (lambda (a) (car (memq a from))) to))
8354                          (if (eq to t)
8355                              (mapcar (lambda (a) (car (memq a from))) cc)
8356                            (mapcar (lambda (a) (car (memq a from)))
8357                                    (mapcar (lambda (a) (car (memq a to)))
8358                                            cc))))
8359                      (nconc (if (eq to t) nil to)
8360                             (if (eq cc t) nil cc)
8361                             from))))
8362              (unless articles
8363                (error "Found no matches for \"%s\"" address))
8364              (gnus-summary-limit articles))
8365       (gnus-summary-position-point))))
8366
8367 (defun gnus-summary-limit-strange-charsets-predicate (header)
8368   (when (fboundp 'char-charset)
8369     (let ((string (concat (mail-header-subject header)
8370                           (mail-header-from header)))
8371           charset found)
8372       (dotimes (i (1- (length string)))
8373         (setq charset (format "%s" (char-charset (aref string (1+ i)))))
8374         (when (string-match "unicode\\|big\\|japanese" charset)
8375           (setq found t)))
8376       found)))
8377
8378 (defun gnus-summary-limit-to-predicate (predicate)
8379   "Limit to articles where PREDICATE returns non-nil.
8380 PREDICATE will be called with the header structures of the
8381 articles."
8382   (let ((articles nil)
8383         (case-fold-search t))
8384     (dolist (header gnus-newsgroup-headers)
8385       (when (funcall predicate header)
8386         (push (mail-header-number header) articles)))
8387     (gnus-summary-limit (nreverse articles))))
8388
8389 (defun gnus-summary-limit-to-age (age &optional younger-p)
8390   "Limit the summary buffer to articles that are older than (or equal) AGE days.
8391 If YOUNGER-P (the prefix) is non-nil, limit the summary buffer to
8392 articles that are younger than AGE days."
8393   (interactive
8394    (let ((younger current-prefix-arg)
8395          (days-got nil)
8396          days)
8397      (while (not days-got)
8398        (setq days (if younger
8399                       (read-string "Limit to articles younger than (in days, older when negative): ")
8400                     (read-string
8401                      "Limit to articles older than (in days, younger when negative): ")))
8402        (when (> (length days) 0)
8403          (setq days (read days)))
8404        (if (numberp days)
8405            (progn
8406              (setq days-got t)
8407              (when (< days 0)
8408                (setq younger (not younger))
8409                (setq days (* days -1))))
8410          (message "Please enter a number.")
8411          (sleep-for 1)))
8412      (list days younger)))
8413   (prog1
8414       (let ((data gnus-newsgroup-data)
8415             (cutoff (days-to-time age))
8416             articles d date is-younger)
8417         (while (setq d (pop data))
8418           (when (and (vectorp (gnus-data-header d))
8419                      (setq date (mail-header-date (gnus-data-header d))))
8420             (setq is-younger (time-less-p
8421                               (time-since (gnus-date-get-time date))
8422                               cutoff))
8423             (when (if younger-p
8424                       is-younger
8425                     (not is-younger))
8426               (push (gnus-data-number d) articles))))
8427         (gnus-summary-limit (nreverse articles)))
8428     (gnus-summary-position-point)))
8429
8430 (defun gnus-summary-limit-to-extra (header regexp &optional not-matching)
8431   "Limit the summary buffer to articles that match an 'extra' header."
8432   (interactive
8433    (let ((header
8434           (intern
8435            (gnus-completing-read
8436             (if current-prefix-arg
8437                 "Exclude extra header"
8438               "Limit extra header")
8439             (mapcar 'symbol-name gnus-extra-headers)
8440             t nil nil
8441             (symbol-name (car gnus-extra-headers))))))
8442      (list header
8443            (read-string (format "%s header %s (regexp): "
8444                                 (if current-prefix-arg "Exclude" "Limit to")
8445                                 header))
8446            current-prefix-arg)))
8447   (when (not (equal "" regexp))
8448     (prog1
8449         (let ((articles (gnus-summary-find-matching
8450                          (cons 'extra header) regexp 'all nil nil
8451                          not-matching)))
8452           (unless articles
8453             (error "Found no matches for \"%s\"" regexp))
8454           (gnus-summary-limit articles))
8455       (gnus-summary-position-point))))
8456
8457 (defun gnus-summary-limit-to-display-predicate ()
8458   "Limit the summary buffer to the predicated in the `display' group parameter."
8459   (interactive)
8460   (unless gnus-newsgroup-display
8461     (error "There is no `display' group parameter"))
8462   (let (articles)
8463     (dolist (gnus-number gnus-newsgroup-articles)
8464       (when (funcall gnus-newsgroup-display)
8465         (push gnus-number articles)))
8466     (gnus-summary-limit articles))
8467   (gnus-summary-position-point))
8468
8469 (defun gnus-summary-limit-to-unread (&optional all)
8470   "Limit the summary buffer to articles that are not marked as read.
8471 If ALL is non-nil, limit strictly to unread articles."
8472   (interactive "P")
8473   (if all
8474       (gnus-summary-limit-to-marks (char-to-string gnus-unread-mark))
8475     (gnus-summary-limit-to-marks
8476      ;; Concat all the marks that say that an article is read and have
8477      ;; those removed.
8478      (list gnus-del-mark gnus-read-mark gnus-ancient-mark
8479            gnus-killed-mark gnus-spam-mark gnus-kill-file-mark
8480            gnus-low-score-mark gnus-expirable-mark
8481            gnus-canceled-mark gnus-catchup-mark gnus-sparse-mark
8482            gnus-duplicate-mark)
8483      'reverse)))
8484
8485 (defun gnus-summary-limit-to-headers (match &optional reverse)
8486   "Limit the summary buffer to articles that have headers that match MATCH.
8487 If REVERSE (the prefix), limit to articles that don't match."
8488   (interactive "sMatch headers (regexp): \nP")
8489   (gnus-summary-limit-to-bodies match reverse t))
8490
8491 (declare-function article-goto-body "gnus-art" ())
8492
8493 (defun gnus-summary-limit-to-bodies (match &optional reverse headersp)
8494   "Limit the summary buffer to articles that have bodies that match MATCH.
8495 If REVERSE (the prefix), limit to articles that don't match."
8496   (interactive "sMatch body (regexp): \nP")
8497   (let ((articles nil)
8498         (gnus-select-article-hook nil)  ;Disable hook.
8499         (gnus-article-prepare-hook nil)
8500         (gnus-use-article-prefetch nil)
8501         (gnus-keep-backlog nil)
8502         (gnus-break-pages nil)
8503         (gnus-summary-display-arrow nil)
8504         (gnus-updated-mode-lines nil)
8505         (gnus-auto-center-summary nil)
8506         (gnus-display-mime-function nil))
8507     (dolist (data gnus-newsgroup-data)
8508       (let (gnus-mark-article-hook)
8509         (gnus-summary-select-article t t nil (gnus-data-number data)))
8510       (with-current-buffer gnus-article-buffer
8511         (article-goto-body)
8512         (let* ((case-fold-search t)
8513                (found (if headersp
8514                           (re-search-backward match nil t)
8515                         (re-search-forward match nil t))))
8516           (when (or (and found
8517                          (not reverse))
8518                     (and (not found)
8519                          reverse))
8520             (push (gnus-data-number data) articles)))))
8521     (if (not articles)
8522         (message "No messages matched")
8523       (gnus-summary-limit articles)))
8524   (gnus-summary-position-point))
8525
8526 (defun gnus-summary-limit-to-singletons (&optional threadsp)
8527   "Limit the summary buffer to articles that aren't part on any thread.
8528 If THREADSP (the prefix), limit to articles that are in threads."
8529   (interactive "P")
8530   (let ((articles nil)
8531         thread-articles
8532         threads)
8533     (dolist (thread gnus-newsgroup-threads)
8534       (if (stringp (car thread))
8535           (dolist (thread (cdr thread))
8536             (push thread threads))
8537         (push thread threads)))
8538     (dolist (thread threads)
8539       (setq thread-articles (gnus-articles-in-thread thread))
8540       (when (or (and threadsp
8541                      (> (length thread-articles) 1))
8542                 (and (not threadsp)
8543                      (= (length thread-articles) 1)))
8544         (setq articles (nconc thread-articles articles))))
8545     (if (not articles)
8546         (message "No messages matched")
8547       (gnus-summary-limit articles))
8548     (gnus-summary-position-point)))
8549
8550 (defun gnus-summary-limit-to-replied (&optional unreplied)
8551   "Limit the summary buffer to replied articles.
8552 If UNREPLIED (the prefix), limit to unreplied articles."
8553   (interactive "P")
8554   (if unreplied
8555       (gnus-summary-limit
8556        (gnus-set-difference gnus-newsgroup-articles
8557         gnus-newsgroup-replied))
8558     (gnus-summary-limit gnus-newsgroup-replied))
8559   (gnus-summary-position-point))
8560
8561 (defun gnus-summary-limit-exclude-marks (marks &optional reverse)
8562   "Exclude articles that are marked with MARKS (e.g. \"DK\").
8563 If REVERSE, limit the summary buffer to articles that are marked
8564 with MARKS.  MARKS can either be a string of marks or a list of marks.
8565 Returns how many articles were removed."
8566   (interactive "sMarks: ")
8567   (gnus-summary-limit-to-marks marks t))
8568
8569 (defun gnus-summary-limit-to-marks (marks &optional reverse)
8570   "Limit the summary buffer to articles that are marked with MARKS (e.g. \"DK\").
8571 If REVERSE (the prefix), limit the summary buffer to articles that are
8572 not marked with MARKS.  MARKS can either be a string of marks or a
8573 list of marks.
8574 Returns how many articles were removed."
8575   (interactive "sMarks: \nP")
8576   (prog1
8577       (let ((data gnus-newsgroup-data)
8578             (marks (if (listp marks) marks
8579                      (append marks nil))) ; Transform to list.
8580             articles)
8581         (while data
8582           (when (if reverse (not (memq (gnus-data-mark (car data)) marks))
8583                   (memq (gnus-data-mark (car data)) marks))
8584             (push (gnus-data-number (car data)) articles))
8585           (setq data (cdr data)))
8586         (gnus-summary-limit articles))
8587     (gnus-summary-position-point)))
8588
8589 (defun gnus-summary-limit-to-score (score)
8590   "Limit to articles with score at or above SCORE."
8591   (interactive "NLimit to articles with score of at least: ")
8592   (let ((data gnus-newsgroup-data)
8593         articles)
8594     (while data
8595       (when (>= (gnus-summary-article-score (gnus-data-number (car data)))
8596                 score)
8597         (push (gnus-data-number (car data)) articles))
8598       (setq data (cdr data)))
8599     (prog1
8600         (gnus-summary-limit articles)
8601       (gnus-summary-position-point))))
8602
8603 (defun gnus-summary-limit-to-unseen ()
8604   "Limit to unseen articles."
8605   (interactive)
8606   (prog1
8607       (gnus-summary-limit gnus-newsgroup-unseen)
8608     (gnus-summary-position-point)))
8609
8610 (defun gnus-summary-limit-include-thread (id)
8611   "Display all the hidden articles that is in the thread with ID in it.
8612 When called interactively, ID is the Message-ID of the current
8613 article."
8614   (interactive (list (mail-header-id (gnus-summary-article-header))))
8615   (let ((articles (gnus-articles-in-thread
8616                    (gnus-id-to-thread (gnus-root-id id))))
8617         ;;we REALLY want the whole thread---this prevents cut-threads
8618         ;;from removing the thread we want to include.
8619         (gnus-fetch-old-headers nil)
8620         (gnus-build-sparse-threads nil))
8621     (prog1
8622         (gnus-summary-limit (nconc articles gnus-newsgroup-limit))
8623       (gnus-summary-limit-include-matching-articles
8624        "subject"
8625        (regexp-quote (gnus-simplify-subject-re
8626                       (mail-header-subject (gnus-id-to-header id)))))
8627       (gnus-summary-position-point))))
8628
8629 (defun gnus-summary-limit-include-matching-articles (header regexp)
8630   "Display all the hidden articles that have HEADERs that match REGEXP."
8631   (interactive (list (read-string "Match on header: ")
8632                      (read-string "Regexp: ")))
8633   (let ((articles (gnus-find-matching-articles header regexp)))
8634     (prog1
8635         (gnus-summary-limit (nconc articles gnus-newsgroup-limit))
8636       (gnus-summary-position-point))))
8637
8638 (defun gnus-summary-insert-dormant-articles ()
8639   "Insert all the dormant articles for this group into the current buffer."
8640   (interactive)
8641   (let ((gnus-verbose (max 6 gnus-verbose)))
8642     (if (not gnus-newsgroup-dormant)
8643         (gnus-message 3 "No dormant articles for this group")
8644       (gnus-summary-goto-subjects gnus-newsgroup-dormant))))
8645
8646 (defun gnus-summary-insert-ticked-articles ()
8647   "Insert ticked articles for this group into the current buffer."
8648   (interactive)
8649   (let ((gnus-verbose (max 6 gnus-verbose)))
8650     (if (not gnus-newsgroup-marked)
8651         (gnus-message 3 "No ticked articles for this group")
8652       (gnus-summary-goto-subjects gnus-newsgroup-marked))))
8653
8654 (defun gnus-summary-limit-include-dormant ()
8655   "Display all the hidden articles that are marked as dormant.
8656 Note that this command only works on a subset of the articles currently
8657 fetched for this group."
8658   (interactive)
8659   (unless gnus-newsgroup-dormant
8660     (error "There are no dormant articles in this group"))
8661   (prog1
8662       (gnus-summary-limit (append gnus-newsgroup-dormant gnus-newsgroup-limit))
8663     (gnus-summary-position-point)))
8664
8665 (defun gnus-summary-include-articles (articles)
8666   "Fetch the headers for ARTICLES and then display the summary lines."
8667   (let ((gnus-inhibit-demon t)
8668         (gnus-agent nil)
8669         (gnus-read-all-available-headers t))
8670     (setq gnus-newsgroup-headers
8671           (gnus-merge
8672            'list gnus-newsgroup-headers
8673            (gnus-fetch-headers articles nil t)
8674            'gnus-article-sort-by-number))
8675     (setq gnus-newsgroup-articles
8676           (gnus-sorted-nunion gnus-newsgroup-articles articles))
8677     (gnus-summary-limit (append articles gnus-newsgroup-limit))))
8678
8679 (defun gnus-summary-limit-exclude-dormant ()
8680   "Hide all dormant articles."
8681   (interactive)
8682   (prog1
8683       (gnus-summary-limit-to-marks (list gnus-dormant-mark) 'reverse)
8684     (gnus-summary-position-point)))
8685
8686 (defun gnus-summary-limit-exclude-childless-dormant ()
8687   "Hide all dormant articles that have no children."
8688   (interactive)
8689   (let ((data (gnus-data-list t))
8690         articles d children)
8691     ;; Find all articles that are either not dormant or have
8692     ;; children.
8693     (while (setq d (pop data))
8694       (when (or (not (= (gnus-data-mark d) gnus-dormant-mark))
8695                 (and (setq children
8696                            (gnus-article-children (gnus-data-number d)))
8697                      (let (found)
8698                        (while children
8699                          (when (memq (car children) articles)
8700                            (setq children nil
8701                                  found t))
8702                          (pop children))
8703                        found)))
8704         (push (gnus-data-number d) articles)))
8705     ;; Do the limiting.
8706     (prog1
8707         (gnus-summary-limit articles)
8708       (gnus-summary-position-point))))
8709
8710 (defun gnus-summary-limit-mark-excluded-as-read (&optional all)
8711   "Mark all unread excluded articles as read.
8712 If ALL, mark even excluded ticked and dormants as read."
8713   (interactive "P")
8714   (setq gnus-newsgroup-limit (sort gnus-newsgroup-limit '<))
8715   (let ((articles (gnus-sorted-ndifference
8716                    (sort
8717                     (mapcar (lambda (h) (mail-header-number h))
8718                             gnus-newsgroup-headers)
8719                     '<)
8720                    gnus-newsgroup-limit))
8721         article)
8722     (setq gnus-newsgroup-unreads
8723           (gnus-sorted-intersection gnus-newsgroup-unreads
8724                                     gnus-newsgroup-limit))
8725     (if all
8726         (setq gnus-newsgroup-dormant nil
8727               gnus-newsgroup-marked nil
8728               gnus-newsgroup-reads
8729               (nconc
8730                (mapcar (lambda (n) (cons n gnus-catchup-mark)) articles)
8731                gnus-newsgroup-reads))
8732       (while (setq article (pop articles))
8733         (unless (or (memq article gnus-newsgroup-dormant)
8734                     (memq article gnus-newsgroup-marked))
8735           (push (cons article gnus-catchup-mark) gnus-newsgroup-reads))))))
8736
8737 (defun gnus-summary-limit (articles &optional pop)
8738   (if pop
8739       ;; We pop the previous limit off the stack and use that.
8740       (setq articles (car gnus-newsgroup-limits)
8741             gnus-newsgroup-limits (cdr gnus-newsgroup-limits))
8742     ;; We use the new limit, so we push the old limit on the stack.
8743     (push gnus-newsgroup-limit gnus-newsgroup-limits))
8744   ;; Set the limit.
8745   (setq gnus-newsgroup-limit articles)
8746   (let ((total (length gnus-newsgroup-data))
8747         (data (gnus-data-find-list (gnus-summary-article-number)))
8748         (gnus-summary-mark-below nil)   ; Inhibit this.
8749         found)
8750     ;; This will do all the work of generating the new summary buffer
8751     ;; according to the new limit.
8752     (gnus-summary-prepare)
8753     ;; Hide any threads, possibly.
8754     (gnus-summary-maybe-hide-threads)
8755     ;; Try to return to the article you were at, or one in the
8756     ;; neighborhood.
8757     (when data
8758       ;; We try to find some article after the current one.
8759       (while data
8760         (when (gnus-summary-goto-subject (gnus-data-number (car data)) nil t)
8761           (setq data nil
8762                 found t))
8763         (setq data (cdr data))))
8764     (unless found
8765       ;; If there is no data, that means that we were after the last
8766       ;; article.  The same goes when we can't find any articles
8767       ;; after the current one.
8768       (goto-char (point-max))
8769       (gnus-summary-find-prev))
8770     (gnus-set-mode-line 'summary)
8771     ;; We return how many articles were removed from the summary
8772     ;; buffer as a result of the new limit.
8773     (- total (length gnus-newsgroup-data))))
8774
8775 (defsubst gnus-invisible-cut-children (threads)
8776   (let ((num 0))
8777     (while threads
8778       (when (memq (mail-header-number (caar threads)) gnus-newsgroup-limit)
8779         (incf num))
8780       (pop threads))
8781     (< num 2)))
8782
8783 (defsubst gnus-cut-thread (thread)
8784   "Go forwards in the thread until we find an article that we want to display."
8785   (when (or (eq gnus-fetch-old-headers 'some)
8786             (eq gnus-fetch-old-headers 'invisible)
8787             (numberp gnus-fetch-old-headers)
8788             (eq gnus-build-sparse-threads 'some)
8789             (eq gnus-build-sparse-threads 'more))
8790     ;; Deal with old-fetched headers and sparse threads.
8791     (while (and
8792             thread
8793             (or
8794              (gnus-summary-article-sparse-p (mail-header-number (car thread)))
8795              (gnus-summary-article-ancient-p
8796               (mail-header-number (car thread))))
8797             (if (or (<= (length (cdr thread)) 1)
8798                     (eq gnus-fetch-old-headers 'invisible))
8799                 (setq gnus-newsgroup-limit
8800                       (delq (mail-header-number (car thread))
8801                             gnus-newsgroup-limit)
8802                       thread (cadr thread))
8803               (when (gnus-invisible-cut-children (cdr thread))
8804                 (let ((th (cdr thread)))
8805                   (while th
8806                     (if (memq (mail-header-number (caar th))
8807                               gnus-newsgroup-limit)
8808                         (setq thread (car th)
8809                               th nil)
8810                       (setq th (cdr th))))))))))
8811   thread)
8812
8813 (defun gnus-cut-threads (threads)
8814   "Cut off all uninteresting articles from the beginning of THREADS."
8815   (when (or (eq gnus-fetch-old-headers 'some)
8816             (eq gnus-fetch-old-headers 'invisible)
8817             (numberp gnus-fetch-old-headers)
8818             (eq gnus-build-sparse-threads 'some)
8819             (eq gnus-build-sparse-threads 'more))
8820     (let ((th threads))
8821       (while th
8822         (setcar th (gnus-cut-thread (car th)))
8823         (setq th (cdr th)))))
8824   ;; Remove nixed out threads.
8825   (delq nil threads))
8826
8827 (defun gnus-summary-initial-limit (&optional show-if-empty)
8828   "Figure out what the initial limit is supposed to be on group entry.
8829 This entails weeding out unwanted dormants, low-scored articles,
8830 fetch-old-headers verbiage, and so on."
8831   ;; Most groups have nothing to remove.
8832   (unless (or gnus-inhibit-limiting
8833               (and (null gnus-newsgroup-dormant)
8834                    (eq gnus-newsgroup-display 'gnus-not-ignore)
8835                    (not (eq gnus-fetch-old-headers 'some))
8836                    (not (numberp gnus-fetch-old-headers))
8837                    (not (eq gnus-fetch-old-headers 'invisible))
8838                    (null gnus-summary-expunge-below)
8839                    (not (eq gnus-build-sparse-threads 'some))
8840                    (not (eq gnus-build-sparse-threads 'more))
8841                    (null gnus-thread-expunge-below)))
8842     (push gnus-newsgroup-limit gnus-newsgroup-limits)
8843     (setq gnus-newsgroup-limit nil)
8844     (mapatoms
8845      (lambda (node)
8846        (unless (car (symbol-value node))
8847          ;; These threads have no parents -- they are roots.
8848          (let ((nodes (cdr (symbol-value node)))
8849                thread)
8850            (while nodes
8851              (if (and gnus-thread-expunge-below
8852                       (< (gnus-thread-total-score (car nodes))
8853                          gnus-thread-expunge-below))
8854                  (gnus-expunge-thread (pop nodes))
8855                (setq thread (pop nodes))
8856                (gnus-summary-limit-children thread))))))
8857      gnus-newsgroup-dependencies)
8858     ;; If this limitation resulted in an empty group, we might
8859     ;; pop the previous limit and use it instead.
8860     (when (and (not gnus-newsgroup-limit)
8861                show-if-empty)
8862       (setq gnus-newsgroup-limit (pop gnus-newsgroup-limits)))
8863     gnus-newsgroup-limit))
8864
8865 (defun gnus-summary-limit-children (thread)
8866   "Return 1 if this subthread is visible and 0 if it is not."
8867   ;; First we get the number of visible children to this thread.  This
8868   ;; is done by recursing down the thread using this function, so this
8869   ;; will really go down to a leaf article first, before slowly
8870   ;; working its way up towards the root.
8871   (when thread
8872     (let* ((max-lisp-eval-depth (max 5000 max-lisp-eval-depth))
8873            (children
8874            (if (cdr thread)
8875                (apply '+ (mapcar 'gnus-summary-limit-children
8876                                  (cdr thread)))
8877              0))
8878            (number (mail-header-number (car thread)))
8879            score)
8880       (if (and
8881            (not (memq number gnus-newsgroup-marked))
8882            (or
8883             ;; If this article is dormant and has absolutely no visible
8884             ;; children, then this article isn't visible.
8885             (and (memq number gnus-newsgroup-dormant)
8886                  (zerop children))
8887             ;; If this is "fetch-old-headered" and there is no
8888             ;; visible children, then we don't want this article.
8889             (and (or (eq gnus-fetch-old-headers 'some)
8890                      (numberp gnus-fetch-old-headers))
8891                  (gnus-summary-article-ancient-p number)
8892                  (zerop children))
8893             ;; If this is "fetch-old-headered" and `invisible', then
8894             ;; we don't want this article.
8895             (and (eq gnus-fetch-old-headers 'invisible)
8896                  (gnus-summary-article-ancient-p number))
8897             ;; If this is a sparsely inserted article with no children,
8898             ;; we don't want it.
8899             (and (eq gnus-build-sparse-threads 'some)
8900                  (gnus-summary-article-sparse-p number)
8901                  (zerop children))
8902             ;; If we use expunging, and this article is really
8903             ;; low-scored, then we don't want this article.
8904             (when (and gnus-summary-expunge-below
8905                        (< (setq score
8906                                 (or (cdr (assq number gnus-newsgroup-scored))
8907                                     gnus-summary-default-score))
8908                           gnus-summary-expunge-below))
8909               ;; We increase the expunge-tally here, but that has
8910               ;; nothing to do with the limits, really.
8911               (incf gnus-newsgroup-expunged-tally)
8912               ;; We also mark as read here, if that's wanted.
8913               (when (and gnus-summary-mark-below
8914                          (< score gnus-summary-mark-below))
8915                 (setq gnus-newsgroup-unreads
8916                       (delq number gnus-newsgroup-unreads))
8917                 (if gnus-newsgroup-auto-expire
8918                     (push number gnus-newsgroup-expirable)
8919                   (push (cons number gnus-low-score-mark)
8920                         gnus-newsgroup-reads)))
8921               t)
8922             ;; Do the `display' group parameter.
8923             (and gnus-newsgroup-display
8924                  (let ((gnus-number number))
8925                    (not (funcall gnus-newsgroup-display))))))
8926           ;; Nope, invisible article.
8927           0
8928         ;; Ok, this article is to be visible, so we add it to the limit
8929         ;; and return 1.
8930         (push number gnus-newsgroup-limit)
8931         1))))
8932
8933 (defun gnus-expunge-thread (thread)
8934   "Mark all articles in THREAD as read."
8935   (let* ((number (mail-header-number (car thread))))
8936     (incf gnus-newsgroup-expunged-tally)
8937     ;; We also mark as read here, if that's wanted.
8938     (setq gnus-newsgroup-unreads
8939           (delq number gnus-newsgroup-unreads))
8940     (if gnus-newsgroup-auto-expire
8941         (push number gnus-newsgroup-expirable)
8942       (push (cons number gnus-low-score-mark)
8943             gnus-newsgroup-reads)))
8944   ;; Go recursively through all subthreads.
8945   (mapcar 'gnus-expunge-thread (cdr thread)))
8946
8947 ;; Summary article oriented commands
8948
8949 (defun gnus-summary-refer-parent-article (n)
8950   "Refer parent article N times.
8951 If N is negative, go to ancestor -N instead.
8952 The difference between N and the number of articles fetched is returned."
8953   (interactive "p")
8954   (let ((skip 1)
8955         error header ref)
8956     (when (not (natnump n))
8957       (setq skip (abs n)
8958             n 1))
8959     (while (and (> n 0)
8960                 (not error))
8961       (setq header (gnus-summary-article-header))
8962       (if (and (eq (mail-header-number header)
8963                    (cdr gnus-article-current))
8964                (equal gnus-newsgroup-name
8965                       (car gnus-article-current)))
8966           ;; If we try to find the parent of the currently
8967           ;; displayed article, then we take a look at the actual
8968           ;; References header, since this is slightly more
8969           ;; reliable than the References field we got from the
8970           ;; server.
8971           (with-current-buffer gnus-original-article-buffer
8972             (nnheader-narrow-to-headers)
8973             (unless (setq ref (message-fetch-field "references"))
8974               (when (setq ref (message-fetch-field "in-reply-to"))
8975                 (setq ref (gnus-extract-message-id-from-in-reply-to ref))))
8976             (widen))
8977         (setq ref
8978               ;; It's not the current article, so we take a bet on
8979               ;; the value we got from the server.
8980               (mail-header-references header)))
8981       (if (and ref
8982                (not (equal ref "")))
8983           (unless (gnus-summary-refer-article (gnus-parent-id ref skip))
8984             (gnus-message 1 "Couldn't find parent"))
8985         (gnus-message 1 "No references in article %d"
8986                       (gnus-summary-article-number))
8987         (setq error t))
8988       (decf n))
8989     (gnus-summary-position-point)
8990     n))
8991
8992 (defun gnus-summary-refer-references ()
8993   "Fetch all articles mentioned in the References header.
8994 Return the number of articles fetched."
8995   (interactive)
8996   (let ((ref (mail-header-references (gnus-summary-article-header)))
8997         (current (gnus-summary-article-number))
8998         (n 0))
8999     (if (or (not ref)
9000             (equal ref ""))
9001         (error "No References in the current article")
9002       ;; For each Message-ID in the References header...
9003       (while (string-match "<[^>]*>" ref)
9004         (incf n)
9005         ;; ... fetch that article.
9006         (gnus-summary-refer-article
9007          (prog1 (match-string 0 ref)
9008            (setq ref (substring ref (match-end 0))))))
9009       (gnus-summary-goto-subject current)
9010       (gnus-summary-position-point)
9011       n)))
9012
9013 (defun gnus-delete-duplicate-headers (headers)
9014   ;; First remove leading duplicates.
9015   (while (and (> (length headers) 1)
9016               (= (mail-header-number (car headers))
9017                  (mail-header-number (cadr headers))))
9018     (pop headers))
9019   ;; Then the rest.
9020   (let ((result headers))
9021     (while (> (length headers) 1)
9022       (if (= (mail-header-number (car headers))
9023              (mail-header-number (cadr headers)))
9024           (setcdr headers (cddr headers))
9025         (pop headers)))
9026     result))
9027
9028 (defun gnus-summary-refer-thread (&optional limit)
9029   "Fetch all articles in the current thread. For backends that
9030 know how to search for threads (currently only 'nnimap) a
9031 non-numeric prefix arg will use nnir to search the entire
9032 server; without a prefix arg only the current group is
9033 searched. If the variable `gnus-refer-thread-use-nnir' is
9034 non-nil the prefix arg has the reverse meaning. If no
9035 backend-specific 'request-thread function is available fetch
9036 LIMIT (the numerical prefix) old headers. If LIMIT is
9037 non-numeric or nil fetch the number specified by the
9038 `gnus-refer-thread-limit' variable."
9039   (interactive "P")
9040   (gnus-warp-to-article)
9041   (let* ((header (gnus-summary-article-header))
9042          (id (mail-header-id header))
9043          (gnus-inhibit-demon t)
9044          (gnus-summary-ignore-duplicates t)
9045          (gnus-read-all-available-headers t)
9046          (gnus-refer-thread-use-nnir
9047           (if (and (not (null limit)) (listp limit))
9048               (not gnus-refer-thread-use-nnir) gnus-refer-thread-use-nnir))
9049          (new-headers
9050           (if (gnus-check-backend-function
9051                'request-thread gnus-newsgroup-name)
9052               (gnus-request-thread header gnus-newsgroup-name)
9053             (let* ((limit (if (numberp limit) (prefix-numeric-value limit)
9054                             gnus-refer-thread-limit))
9055                    (last (if (numberp limit)
9056                              (min (+ (mail-header-number header)
9057                                      limit)
9058                                   gnus-newsgroup-highest)
9059                            gnus-newsgroup-highest))
9060                    (subject (gnus-simplify-subject
9061                              (mail-header-subject header)))
9062                    (refs (split-string (or (mail-header-references header)
9063                                            "")))
9064                    (gnus-parse-headers-hook
9065                     `(lambda () (goto-char (point-min))
9066                       (keep-lines
9067                        (regexp-opt ',(append refs (list id subject)))))))
9068               (gnus-fetch-headers (list last) (if (numberp limit)
9069                                                   (* 2 limit) limit) t))))
9070          article-ids)
9071     (when (listp new-headers)
9072       (dolist (header new-headers)
9073         (push (mail-header-number header) article-ids)
9074         (when (member (mail-header-number header) gnus-newsgroup-unselected)
9075           (push (mail-header-number header) gnus-newsgroup-unreads)
9076           (setq gnus-newsgroup-unselected
9077                 (delete (mail-header-number header)
9078                         gnus-newsgroup-unselected))))
9079       (setq gnus-newsgroup-headers
9080             (gnus-delete-duplicate-headers
9081              (gnus-merge
9082               'list gnus-newsgroup-headers new-headers
9083               'gnus-article-sort-by-number)))
9084       (setq gnus-newsgroup-articles
9085             (gnus-sorted-nunion gnus-newsgroup-articles (nreverse article-ids)))
9086       (gnus-summary-limit-include-thread id)))
9087   (gnus-summary-show-thread))
9088
9089 (defun gnus-summary-open-group-with-article (message-id)
9090   "Open a group containing the article with the given MESSAGE-ID."
9091   (interactive "sMessage-ID: ")
9092   (require 'nndoc)
9093   (with-temp-buffer
9094     ;; Prepare a dummy article
9095     (erase-buffer)
9096     (insert "From nobody Tue Sep 13 22:05:34 2011\n\n")
9097
9098     ;; Prepare pretty modelines for summary and article buffers
9099     (let ((gnus-summary-mode-line-format "Found %G")
9100           (gnus-article-mode-line-format
9101            ;; Group names just get in the way here, especially the
9102            ;; abbreviated ones
9103            (if (string-match "%[gG]" gnus-article-mode-line-format)
9104                (concat (substring gnus-article-mode-line-format
9105                                   0 (match-beginning 0))
9106                        (substring gnus-article-mode-line-format (match-end 0)))
9107              gnus-article-mode-line-format)))
9108
9109       ;; Build an ephemeral group containing the dummy article (hidden)
9110       (gnus-group-read-ephemeral-group
9111        message-id
9112        `(nndoc ,message-id
9113                (nndoc-address ,(current-buffer))
9114                (nndoc-article-type mbox))
9115        :activate
9116        (cons (current-buffer) gnus-current-window-configuration)
9117        (not :request-only)
9118        '(-1)                            ; :select-articles
9119        (not :parameters)
9120        0))                              ; :number
9121     ;; Fetch the desired article
9122     (gnus-summary-refer-article message-id)))
9123
9124 (defun gnus-summary-refer-article (message-id)
9125   "Fetch an article specified by MESSAGE-ID."
9126   (interactive "sMessage-ID: ")
9127   (gnus-warp-to-article)
9128   (when (and (stringp message-id)
9129              (not (zerop (length message-id))))
9130     (setq message-id (gnus-replace-in-string message-id " " ""))
9131     ;; Construct the correct Message-ID if necessary.
9132     ;; Suggested by tale@pawl.rpi.edu.
9133     (unless (string-match "^<" message-id)
9134       (setq message-id (concat "<" message-id)))
9135     (unless (string-match ">$" message-id)
9136       (setq message-id (concat message-id ">")))
9137     ;; People often post MIDs from URLs, so unhex it:
9138     (unless (string-match "@" message-id)
9139       (setq message-id (gnus-url-unhex-string message-id)))
9140     (let* ((header (gnus-id-to-header message-id))
9141            (sparse (and header
9142                         (gnus-summary-article-sparse-p
9143                          (mail-header-number header))
9144                         (memq (mail-header-number header)
9145                               gnus-newsgroup-limit)))
9146            number)
9147       (cond
9148        ;; If the article is present in the buffer we just go to it.
9149        ((and header
9150              (or (not (gnus-summary-article-sparse-p
9151                        (mail-header-number header)))
9152                  sparse))
9153         (prog1
9154             (gnus-summary-goto-article
9155              (mail-header-number header) nil t)
9156           (when sparse
9157             (gnus-summary-update-article (mail-header-number header)))))
9158        (t
9159         ;; We fetch the article.
9160         (catch 'found
9161           (dolist (gnus-override-method (gnus-refer-article-methods))
9162             (when (and (gnus-check-server gnus-override-method)
9163                        ;; Fetch the header,
9164                        (setq number (gnus-summary-insert-subject message-id)))
9165               ;; and display the article.
9166               (gnus-summary-select-article nil nil nil number)
9167               (throw 'found t)))
9168           (gnus-message 3 "Couldn't fetch article %s" message-id)))))))
9169
9170 (defun gnus-refer-article-methods ()
9171   "Return a list of referable methods."
9172   (cond
9173    ;; No method, so we default to current and native.
9174    ((null gnus-refer-article-method)
9175     (list gnus-current-select-method gnus-select-method))
9176    ;; Current.
9177    ((eq 'current gnus-refer-article-method)
9178     (list gnus-current-select-method))
9179    ;; List of select methods.
9180    ((not (and (symbolp (car gnus-refer-article-method))
9181               (assq (car gnus-refer-article-method) nnoo-definition-alist)))
9182     (let (out)
9183       (dolist (method gnus-refer-article-method)
9184         (push (if (eq 'current method)
9185                   gnus-current-select-method
9186                 (if (eq 'nnir (car method))
9187                     (list
9188                      'nnir
9189                      (or (cadr method)
9190                          (gnus-method-to-server gnus-current-select-method)))
9191                   method))
9192               out))
9193       (nreverse out)))
9194    ;; One single select method.
9195    (t
9196     (list gnus-refer-article-method))))
9197
9198 (defun gnus-summary-edit-parameters ()
9199   "Edit the group parameters of the current group."
9200   (interactive)
9201   (gnus-group-edit-group gnus-newsgroup-name 'params))
9202
9203 (defun gnus-summary-customize-parameters ()
9204   "Customize the group parameters of the current group."
9205   (interactive)
9206   (gnus-group-customize gnus-newsgroup-name))
9207
9208 (defun gnus-summary-enter-digest-group (&optional force)
9209   "Enter an nndoc group based on the current article.
9210 If FORCE, force a digest interpretation.  If not, try to guess
9211 what the document format is.
9212
9213 To control what happens when you exit the group, see the
9214 `gnus-auto-select-on-ephemeral-exit' variable."
9215   (interactive "P")
9216   (let ((conf gnus-current-window-configuration))
9217     (save-window-excursion
9218       (save-excursion
9219         (let (gnus-article-prepare-hook
9220               gnus-display-mime-function
9221               gnus-break-pages)
9222           (gnus-summary-select-article))))
9223     (setq gnus-current-window-configuration conf)
9224     (let* ((name (format "%s-%d"
9225                          (gnus-group-prefixed-name
9226                           gnus-newsgroup-name (list 'nndoc ""))
9227                          (with-current-buffer gnus-summary-buffer
9228                            gnus-current-article)))
9229            (ogroup gnus-newsgroup-name)
9230            (params (append (gnus-info-params (gnus-get-info ogroup))
9231                            (list (cons 'to-group ogroup))
9232                            (list (cons 'parent-group ogroup))
9233                            (list (cons 'save-article-group ogroup))))
9234            (case-fold-search t)
9235            (buf (current-buffer))
9236            dig to-address charset)
9237       (with-current-buffer gnus-original-article-buffer
9238         ;; Have the digest group inherit the main mail address of
9239         ;; the parent article.
9240         (when (setq to-address (or (gnus-fetch-field "reply-to")
9241                                    (gnus-fetch-field "from")))
9242           (setq params
9243                 (append
9244                  params
9245                  (list (cons 'to-address
9246                              (funcall gnus-decode-encoded-address-function
9247                                       to-address))))))
9248         (setq dig (nnheader-set-temp-buffer " *gnus digest buffer*"))
9249         (insert-buffer-substring gnus-original-article-buffer)
9250         (narrow-to-region
9251          (goto-char (point-min))
9252          (or (search-forward "\n\n" nil t) (point)))
9253         ;; Remove lines that may lead nndoc to misinterpret the
9254         ;; document type.
9255         (goto-char (point-min))
9256         (delete-matching-lines "^Path:\\|^From ")
9257         ;; Parse charset, and decode content transfer encoding.
9258         (setq charset (mail-content-type-get
9259                        (mail-header-parse-content-type
9260                         (or (gnus-fetch-field "content-type") ""))
9261                        'charset))
9262         (let ((encoding (gnus-fetch-field "content-transfer-encoding")))
9263           (when encoding
9264             (message-remove-header "content-transfer-encoding")
9265             (goto-char (point-max))
9266             (widen)
9267             (narrow-to-region (point) (point-max))
9268             (mm-decode-content-transfer-encoding
9269              (intern (downcase (mail-header-strip encoding))))))
9270         (widen))
9271       (unwind-protect
9272           (if (let ((gnus-newsgroup-ephemeral-charset
9273                      (if charset
9274                          (intern (downcase (gnus-strip-whitespace charset)))
9275                        gnus-newsgroup-charset))
9276                     (gnus-newsgroup-ephemeral-ignored-charsets
9277                      gnus-newsgroup-ignored-charsets))
9278                 (gnus-group-read-ephemeral-group
9279                  name `(nndoc ,name (nndoc-address ,(get-buffer dig))
9280                               (nndoc-article-type
9281                                ,(if force 'mbox 'guess)))
9282                  t nil nil nil
9283                  `((adapt-file . ,(gnus-score-file-name gnus-newsgroup-name
9284                                                         "ADAPT")))))
9285               ;; Make all postings to this group go to the parent group.
9286               (nconc (gnus-info-params (gnus-get-info name))
9287                      params)
9288             ;; Couldn't select this doc group.
9289             (switch-to-buffer buf)
9290             (gnus-set-global-variables)
9291             (gnus-configure-windows 'summary)
9292             (gnus-message 3 "Article couldn't be entered?"))
9293         (kill-buffer dig)))))
9294
9295 (defun gnus-summary-read-document (n)
9296   "Open a new group based on the current article(s).
9297 This will allow you to read digests and other similar
9298 documents as newsgroups.
9299 Obeys the standard process/prefix convention."
9300   (interactive "P")
9301   (let* ((ogroup gnus-newsgroup-name)
9302          (params (append (gnus-info-params (gnus-get-info ogroup))
9303                          (list (cons 'to-group ogroup))))
9304          group egroup groups vgroup)
9305     (dolist (article (gnus-summary-work-articles n))
9306       (setq group (format "%s-%d" gnus-newsgroup-name article))
9307       (gnus-summary-remove-process-mark article)
9308       (when (gnus-summary-display-article article)
9309         (save-excursion ;;What for?
9310           (with-temp-buffer
9311             (insert-buffer-substring gnus-original-article-buffer)
9312             ;; Remove some headers that may lead nndoc to make
9313             ;; the wrong guess.
9314             (message-narrow-to-head)
9315             (goto-char (point-min))
9316             (delete-matching-lines "^Path:\\|^From ")
9317             (widen)
9318             (if (setq egroup
9319                       (gnus-group-read-ephemeral-group
9320                        group `(nndoc ,group (nndoc-address ,(current-buffer))
9321                                      (nndoc-article-type guess))
9322                        t nil t))
9323                 (progn
9324                   ;; Make all postings to this group go to the parent group.
9325                   (nconc (gnus-info-params (gnus-get-info egroup))
9326                          params)
9327                   (push egroup groups))
9328               ;; Couldn't select this doc group.
9329               (gnus-error 3 "Article couldn't be entered"))))))
9330     ;; Now we have selected all the documents.
9331     (cond
9332      ((not groups)
9333       (error "None of the articles could be interpreted as documents"))
9334      ((gnus-group-read-ephemeral-group
9335        (setq vgroup (format
9336                      "nnvirtual:%s-%s" gnus-newsgroup-name
9337                      (format-time-string "%Y%m%dT%H%M%S")))
9338        `(nnvirtual ,vgroup (nnvirtual-component-groups ,groups))
9339        t
9340        (cons (current-buffer) 'summary)))
9341      (t
9342       (error "Couldn't select virtual nndoc group")))))
9343
9344 (defun gnus-summary-widget-forward (arg)
9345   "Move point to the next field or button in the article.
9346 With optional ARG, move across that many fields."
9347   (interactive "p")
9348   (gnus-summary-select-article)
9349   (gnus-configure-windows 'article)
9350   (select-window (gnus-get-buffer-window gnus-article-buffer))
9351   (widget-forward arg))
9352
9353 (defun gnus-summary-widget-backward (arg)
9354   "Move point to the previous field or button in the article.
9355 With optional ARG, move across that many fields."
9356   (interactive "p")
9357   (gnus-summary-select-article)
9358   (gnus-configure-windows 'article)
9359   (select-window (gnus-get-buffer-window gnus-article-buffer))
9360   (unless (widget-at (point))
9361     (goto-char (point-max)))
9362   (widget-backward arg))
9363
9364 (defun gnus-summary-isearch-article (&optional regexp-p)
9365   "Do incremental search forward on the current article.
9366 If REGEXP-P (the prefix) is non-nil, do regexp isearch."
9367   (interactive "P")
9368   (gnus-summary-select-article)
9369   (gnus-configure-windows 'article)
9370   (gnus-eval-in-buffer-window gnus-article-buffer
9371     (save-restriction
9372       (widen)
9373       (isearch-forward regexp-p))))
9374
9375 (defun gnus-summary-repeat-search-article-forward ()
9376   "Repeat the previous search forwards."
9377   (interactive)
9378   (unless gnus-last-search-regexp
9379     (error "No previous search"))
9380   (gnus-summary-search-article-forward gnus-last-search-regexp))
9381
9382 (defun gnus-summary-repeat-search-article-backward ()
9383   "Repeat the previous search backwards."
9384   (interactive)
9385   (unless gnus-last-search-regexp
9386     (error "No previous search"))
9387   (gnus-summary-search-article-forward gnus-last-search-regexp t))
9388
9389 (defun gnus-summary-search-article-forward (regexp &optional backward)
9390   "Search for an article containing REGEXP forward.
9391 If BACKWARD, search backward instead."
9392   (interactive
9393    (list (read-string
9394           (format "Search article %s (regexp%s): "
9395                   (if current-prefix-arg "backward" "forward")
9396                   (if gnus-last-search-regexp
9397                       (concat ", default " gnus-last-search-regexp)
9398                     "")))
9399          current-prefix-arg))
9400   (if (string-equal regexp "")
9401       (setq regexp (or gnus-last-search-regexp ""))
9402     (setq gnus-last-search-regexp regexp)
9403     (setq gnus-article-before-search gnus-current-article))
9404   ;; Intentionally set gnus-last-article.
9405   (setq gnus-last-article gnus-article-before-search)
9406   (let ((gnus-last-article gnus-last-article))
9407     (if (gnus-summary-search-article regexp backward)
9408         (gnus-summary-show-thread)
9409       (signal 'search-failed (list regexp)))))
9410
9411 (defun gnus-summary-search-article-backward (regexp)
9412   "Search for an article containing REGEXP backward."
9413   (interactive
9414    (list (read-string
9415           (format "Search article backward (regexp%s): "
9416                   (if gnus-last-search-regexp
9417                       (concat ", default " gnus-last-search-regexp)
9418                     "")))))
9419   (gnus-summary-search-article-forward regexp 'backward))
9420
9421 (defun gnus-summary-search-article (regexp &optional backward)
9422   "Search for an article containing REGEXP.
9423 Optional argument BACKWARD means do search for backward.
9424 `gnus-select-article-hook' is not called during the search."
9425   ;; We have to require this here to make sure that the following
9426   ;; dynamic binding isn't shadowed by autoloading.
9427   (require 'gnus-async)
9428   (require 'gnus-art)
9429   (let ((gnus-select-article-hook nil)  ;Disable hook.
9430         (gnus-article-prepare-hook nil)
9431         (gnus-mark-article-hook nil)    ;Inhibit marking as read.
9432         (gnus-use-article-prefetch nil)
9433         (gnus-xmas-force-redisplay nil) ;Inhibit XEmacs redisplay.
9434         (gnus-use-trees nil)            ;Inhibit updating tree buffer.
9435         (gnus-visual nil)
9436         (gnus-keep-backlog nil)
9437         (gnus-break-pages nil)
9438         (gnus-summary-display-arrow nil)
9439         (gnus-updated-mode-lines nil)
9440         (gnus-auto-center-summary nil)
9441         (sum (current-buffer))
9442         (gnus-display-mime-function nil)
9443         (found nil)
9444         point)
9445     (gnus-save-hidden-threads
9446       (gnus-summary-select-article)
9447       (set-buffer gnus-article-buffer)
9448       (goto-char (window-point (get-buffer-window (current-buffer))))
9449       (when backward
9450         (forward-line -1))
9451       (while (not found)
9452         (gnus-message 7 "Searching article: %d..." (cdr gnus-article-current))
9453         (if (if backward
9454                 (re-search-backward regexp nil t)
9455               (re-search-forward regexp nil t))
9456             ;; We found the regexp.
9457             (progn
9458               (setq found 'found)
9459               (beginning-of-line)
9460               (set-window-start
9461                (get-buffer-window (current-buffer))
9462                (point))
9463               (forward-line 1)
9464               (set-window-point
9465                (get-buffer-window (current-buffer))
9466                (point))
9467               (set-buffer sum)
9468               (setq point (point)))
9469           ;; We didn't find it, so we go to the next article.
9470           (set-buffer sum)
9471           (setq found 'not)
9472           (while (eq found 'not)
9473             (if (not (if backward (gnus-summary-find-prev)
9474                        (gnus-summary-find-next)))
9475                 ;; No more articles.
9476                 (setq found t)
9477               ;; Select the next article and adjust point.
9478               (unless (gnus-summary-article-sparse-p
9479                        (gnus-summary-article-number))
9480                 (setq found nil)
9481                 (gnus-summary-select-article)
9482                 (set-buffer gnus-article-buffer)
9483                 (widen)
9484                 (goto-char (if backward (point-max) (point-min))))))))
9485       (gnus-message 7 ""))
9486     ;; Return whether we found the regexp.
9487     (when (eq found 'found)
9488       (goto-char point)
9489       (gnus-summary-show-thread)
9490       (gnus-summary-goto-subject gnus-current-article)
9491       (gnus-summary-position-point)
9492       t)))
9493
9494 (defun gnus-find-matching-articles (header regexp)
9495   "Return a list of all articles that match REGEXP on HEADER.
9496 This search includes all articles in the current group that Gnus has
9497 fetched headers for, whether they are displayed or not."
9498   (let ((articles nil)
9499         ;; Can't eta-reduce because it's a macro.
9500         (func `(lambda (h) (,(intern (concat "mail-header-" header)) h)))
9501         (case-fold-search t))
9502     (dolist (header gnus-newsgroup-headers)
9503       (when (string-match regexp (funcall func header))
9504         (push (mail-header-number header) articles)))
9505     (nreverse articles)))
9506
9507 (defun gnus-summary-find-matching (header regexp &optional backward unread
9508                                           not-case-fold not-matching)
9509   "Return a list of all articles that match REGEXP on HEADER.
9510 The search stars on the current article and goes forwards unless
9511 BACKWARD is non-nil.  If BACKWARD is `all', do all articles.
9512 If UNREAD is non-nil, only unread articles will
9513 be taken into consideration.  If NOT-CASE-FOLD, case won't be folded
9514 in the comparisons. If NOT-MATCHING, return a list of all articles that
9515 not match REGEXP on HEADER."
9516   (let ((case-fold-search (not not-case-fold))
9517         articles d func)
9518     (if (consp header)
9519         (if (eq (car header) 'extra)
9520             (setq func
9521                   `(lambda (h)
9522                      (or (cdr (assq ',(cdr header) (mail-header-extra h)))
9523                          "")))
9524           (error "%s is an invalid header" header))
9525       (unless (fboundp (intern (concat "mail-header-" header)))
9526         (error "%s is not a valid header" header))
9527       (setq func `(lambda (h) (,(intern (concat "mail-header-" header)) h))))
9528     (dolist (d (if (eq backward 'all)
9529                    gnus-newsgroup-data
9530                  (gnus-data-find-list
9531                   (gnus-summary-article-number)
9532                   (gnus-data-list backward))))
9533       (when (and (or (not unread)       ; We want all articles...
9534                      (gnus-data-unread-p d)) ; Or just unreads.
9535                  (vectorp (gnus-data-header d)) ; It's not a pseudo.
9536                  (if not-matching
9537                      (not (string-match
9538                            regexp
9539                            (funcall func (gnus-data-header d))))
9540                    (string-match regexp
9541                                  (funcall func (gnus-data-header d)))))
9542         (push (gnus-data-number d) articles))) ; Success!
9543     (nreverse articles)))
9544
9545 (defun gnus-summary-execute-command (header regexp command &optional backward)
9546   "Search forward for an article whose HEADER matches REGEXP and execute COMMAND.
9547 If HEADER is an empty string (or nil), the match is done on the entire
9548 article.  If BACKWARD (the prefix) is non-nil, search backward instead."
9549   (interactive
9550    (list (let ((completion-ignore-case t))
9551            (gnus-completing-read
9552             "Header name"
9553             (mapcar 'symbol-name
9554                     (append
9555                      '(Number Subject From Lines Date
9556                        Message-ID Xref References Body)
9557                      gnus-extra-headers))
9558             'require-match))
9559          (read-string "Regexp: ")
9560          (read-key-sequence "Command: ")
9561          current-prefix-arg))
9562   (when (equal header "Body")
9563     (setq header ""))
9564   ;; Hidden thread subtrees must be searched as well.
9565   (gnus-summary-show-all-threads)
9566   ;; We don't want to change current point nor window configuration.
9567   (save-excursion
9568     (save-window-excursion
9569       (let (gnus-visual
9570             gnus-treat-strip-trailing-blank-lines
9571             gnus-treat-strip-leading-blank-lines
9572             gnus-treat-strip-multiple-blank-lines
9573             gnus-treat-hide-boring-headers
9574             gnus-treat-fold-newsgroups
9575             gnus-article-prepare-hook)
9576         (gnus-message 6 "Executing %s..." (key-description command))
9577         ;; We'd like to execute COMMAND interactively so as to give arguments.
9578         (gnus-execute header regexp
9579                       `(call-interactively ',(key-binding command))
9580                       backward)
9581         (gnus-message 6 "Executing %s...done" (key-description command))))))
9582
9583 (defun gnus-summary-beginning-of-article ()
9584   "Scroll the article back to the beginning."
9585   (interactive)
9586   (gnus-summary-select-article)
9587   (gnus-configure-windows 'article)
9588   (gnus-eval-in-buffer-window gnus-article-buffer
9589     (widen)
9590     (goto-char (point-min))
9591     (when gnus-break-pages
9592       (gnus-narrow-to-page))))
9593
9594 (defun gnus-summary-end-of-article ()
9595   "Scroll to the end of the article."
9596   (interactive)
9597   (gnus-summary-select-article)
9598   (gnus-configure-windows 'article)
9599   (gnus-eval-in-buffer-window gnus-article-buffer
9600     (widen)
9601     (goto-char (point-max))
9602     (recenter -3)
9603     (when gnus-break-pages
9604       (gnus-narrow-to-page))))
9605
9606 (defun gnus-summary-print-truncate-and-quote (string &optional len)
9607   "Truncate to LEN and quote all \"(\"'s in STRING."
9608   (gnus-replace-in-string (if (and len (> (length string) len))
9609                               (substring string 0 len)
9610                             string)
9611                           "[()]" "\\\\\\&"))
9612
9613 (defun gnus-summary-print-article (&optional filename n)
9614   "Generate and print a PostScript image of the process-marked (mail) articles.
9615
9616 If used interactively, print the current article if none are
9617 process-marked.  With prefix arg, prompt the user for the name of the
9618 file to save in.
9619
9620 When used from Lisp, accept two optional args FILENAME and N.  N means
9621 to print the next N articles.  If N is negative, print the N previous
9622 articles.  If N is nil and articles have been marked with the process
9623 mark, print these instead.
9624
9625 If the optional first argument FILENAME is nil, send the image to the
9626 printer.  If FILENAME is a string, save the PostScript image in a file with
9627 that name.  If FILENAME is a number, prompt the user for the name of the file
9628 to save in."
9629   (interactive (list (ps-print-preprint current-prefix-arg)))
9630   (dolist (article (gnus-summary-work-articles n))
9631     (gnus-summary-select-article nil nil 'pseudo article)
9632     (gnus-eval-in-buffer-window gnus-article-buffer
9633       (gnus-print-buffer))
9634     (gnus-summary-remove-process-mark article))
9635   (ps-despool filename))
9636
9637 (defun gnus-print-buffer ()
9638   (let ((ps-left-header
9639          (list
9640           (concat "("
9641                   (gnus-summary-print-truncate-and-quote
9642                    (mail-header-subject gnus-current-headers)
9643                    66) ")")
9644           (concat "("
9645                   (gnus-summary-print-truncate-and-quote
9646                    (mail-header-from gnus-current-headers)
9647                    45) ")")))
9648         (ps-right-header
9649          (list
9650           "/pagenumberstring load"
9651           (concat "("
9652                   (mail-header-date gnus-current-headers) ")"))))
9653     (gnus-run-hooks 'gnus-ps-print-hook)
9654     (save-excursion
9655       (if ps-print-color-p
9656           (ps-spool-buffer-with-faces)
9657         (ps-spool-buffer)))))
9658
9659 (declare-function gnus-flush-original-article-buffer "gnus-art" ())
9660
9661 (defun gnus-summary-show-complete-article ()
9662   "Show a complete version of the current article.
9663 This is only useful if you're looking at a partial version of the
9664 article currently."
9665   (interactive)
9666   (let ((gnus-keep-backlog nil)
9667         (gnus-use-cache nil)
9668         (gnus-agent nil)
9669         (variable (intern
9670                    (format "%s-fetch-partial-articles"
9671                            (car (gnus-find-method-for-group
9672                                  gnus-newsgroup-name)))
9673                    obarray))
9674         old-val)
9675     (unwind-protect
9676         (progn
9677           (setq old-val (symbol-value variable))
9678           (set variable nil)
9679           (gnus-flush-original-article-buffer)
9680           (gnus-summary-show-article))
9681       (set variable old-val))))
9682
9683 (defun gnus-summary-show-article (&optional arg)
9684   "Force redisplaying of the current article.
9685 If ARG (the prefix) is a number, show the article with the charset
9686 defined in `gnus-summary-show-article-charset-alist', or the charset
9687 input.
9688 If ARG (the prefix) is non-nil and not a number, show the article,
9689 but without running any of the article treatment functions
9690 article.  Normally, the keystroke is `C-u g'.  When using `C-u
9691 C-u g', show the raw article."
9692   (interactive "P")
9693   (cond
9694    ((numberp arg)
9695     (gnus-summary-show-article t)
9696     (let ((gnus-newsgroup-charset
9697            (or (cdr (assq arg gnus-summary-show-article-charset-alist))
9698                (mm-read-coding-system
9699                 "View as charset: " ;; actually it is coding system.
9700                 (with-current-buffer gnus-article-buffer
9701                   (mm-detect-coding-region (point) (point-max))))))
9702           (gnus-newsgroup-ignored-charsets 'gnus-all))
9703       (gnus-summary-select-article nil 'force)
9704       (let ((deps gnus-newsgroup-dependencies)
9705             head header lines)
9706         (with-current-buffer gnus-original-article-buffer
9707           (save-restriction
9708             (message-narrow-to-head)
9709             (setq head (buffer-string))
9710             (goto-char (point-min))
9711             (unless (re-search-forward "^lines:[ \t]\\([0-9]+\\)" nil t)
9712               (goto-char (point-max))
9713               (widen)
9714               (setq lines (1- (count-lines (point) (point-max))))))
9715           (with-temp-buffer
9716             (insert (format "211 %d Article retrieved.\n"
9717                             (cdr gnus-article-current)))
9718             (insert head)
9719             (if lines (insert (format "Lines: %d\n" lines)))
9720             (insert ".\n")
9721             (let ((nntp-server-buffer (current-buffer)))
9722               (setq header (car (gnus-get-newsgroup-headers deps t))))))
9723         (gnus-data-set-header
9724          (gnus-data-find (cdr gnus-article-current))
9725          header)
9726         (gnus-summary-update-article-line
9727          (cdr gnus-article-current) header)
9728         (when (gnus-summary-goto-subject (cdr gnus-article-current) nil t)
9729           (gnus-summary-update-secondary-mark (cdr gnus-article-current))))))
9730    ((not arg)
9731     ;; Select the article the normal way.
9732     (if (eq mm-text-html-renderer 'shr)
9733         (progn
9734           (require 'shr)
9735           (let ((shr-ignore-cache t))
9736             (gnus-summary-select-article nil 'force)))
9737       (gnus-summary-select-article nil 'force)))
9738    ((equal arg '(16))
9739     ;; C-u C-u g
9740     (let ((gnus-inhibit-article-treatments t))
9741       (gnus-summary-select-article nil 'force)))
9742    (t
9743     ;; We have to require this here to make sure that the following
9744     ;; dynamic binding isn't shadowed by autoloading.
9745     (require 'gnus-async)
9746     (require 'gnus-art)
9747     ;; Bind the article treatment functions to nil.
9748     (let ((gnus-have-all-headers t)
9749           gnus-article-prepare-hook
9750           gnus-article-decode-hook
9751           gnus-display-mime-function
9752           gnus-break-pages)
9753       ;; Destroy any MIME parts.
9754       (when (gnus-buffer-live-p gnus-article-buffer)
9755         (with-current-buffer gnus-article-buffer
9756           (gnus-article-stop-animations)
9757           (gnus-stop-downloads)
9758           (mm-destroy-parts gnus-article-mime-handles)
9759           ;; Set it to nil for safety reason.
9760           (setq gnus-article-mime-handle-alist nil)
9761           (setq gnus-article-mime-handles nil)))
9762       (gnus-summary-select-article nil 'force))))
9763   (gnus-summary-goto-subject gnus-current-article)
9764   (gnus-summary-position-point))
9765
9766 (defun gnus-summary-show-raw-article ()
9767   "Show the raw article without any article massaging functions being run."
9768   (interactive)
9769   (gnus-summary-show-article t))
9770
9771 (defun gnus-summary-verbose-headers (&optional arg)
9772   "Toggle permanent full header display.
9773 If ARG is a positive number, turn header display on.
9774 If ARG is a negative number, turn header display off."
9775   (interactive "P")
9776   (setq gnus-show-all-headers
9777         (cond ((or (not (numberp arg))
9778                    (zerop arg))
9779                (not gnus-show-all-headers))
9780               ((natnump arg)
9781                t)))
9782   (gnus-summary-show-article))
9783
9784 (declare-function article-narrow-to-head "gnus-art" ())
9785 (declare-function gnus-article-hidden-text-p "gnus-art" (type))
9786 (declare-function gnus-delete-wash-type "gnus-art" (type))
9787 (declare-function gnus-mime-buttonize-attachments-in-header
9788                   "gnus-art" (&optional interactive))
9789
9790 (defun gnus-summary-toggle-header (&optional arg)
9791   "Show the headers if they are hidden, or hide them if they are shown.
9792 If ARG is a positive number, show the entire header.
9793 If ARG is a negative number, hide the unwanted header lines."
9794   (interactive "P")
9795   (let ((window (and (gnus-buffer-live-p gnus-article-buffer)
9796                      (get-buffer-window gnus-article-buffer t))))
9797     (with-current-buffer gnus-article-buffer
9798       (widen)
9799       (article-narrow-to-head)
9800       (let* ((inhibit-read-only t)
9801              (inhibit-point-motion-hooks t)
9802              (hidden (if (numberp arg)
9803                          (>= arg 0)
9804                        (or (not (looking-at "[^ \t\n]+:"))
9805                            (gnus-article-hidden-text-p 'headers))))
9806              s e)
9807         (delete-region (point-min) (point-max))
9808         (with-current-buffer gnus-original-article-buffer
9809           (goto-char (setq s (point-min)))
9810           (setq e (if (search-forward "\n\n" nil t)
9811                       (1- (point))
9812                     (point-max))))
9813         (insert-buffer-substring gnus-original-article-buffer s e)
9814         (run-hooks 'gnus-article-decode-hook)
9815         (if hidden
9816             (let ((gnus-treat-hide-headers nil)
9817                   (gnus-treat-hide-boring-headers nil))
9818               (gnus-delete-wash-type 'headers)
9819               (gnus-treat-article 'head))
9820           (gnus-treat-article 'head)
9821           ;; Add attachment buttons to the header.
9822           (when gnus-mime-display-attachment-buttons-in-header
9823             (gnus-mime-buttonize-attachments-in-header)))
9824         (widen)
9825         (if window
9826             (set-window-start window (goto-char (point-min))))
9827         (if gnus-break-pages
9828             (gnus-narrow-to-page)
9829           (when (gnus-visual-p 'page-marker)
9830             (let ((inhibit-read-only t))
9831               (gnus-remove-text-with-property 'gnus-prev)
9832               (gnus-remove-text-with-property 'gnus-next))))
9833         (gnus-set-mode-line 'article)))))
9834
9835 (defun gnus-summary-show-all-headers ()
9836   "Make all header lines visible."
9837   (interactive)
9838   (gnus-summary-toggle-header 1))
9839
9840 (defun gnus-summary-caesar-message (&optional arg)
9841   "Caesar rotate the current article by 13.
9842 With a non-numerical prefix, also rotate headers.  A numerical
9843 prefix specifies how many places to rotate each letter forward."
9844   (interactive "P")
9845   (gnus-summary-select-article)
9846   (let ((mail-header-separator ""))
9847     (gnus-eval-in-buffer-window gnus-article-buffer
9848       (save-restriction
9849         (widen)
9850         (let ((start (window-start))
9851               (inhibit-read-only t))
9852           (if (equal arg '(4))
9853               (message-caesar-buffer-body nil t)
9854             (message-caesar-buffer-body arg))
9855           (set-window-start (get-buffer-window (current-buffer)) start)))))
9856   ;; Create buttons and stuff...
9857   (gnus-treat-article nil))
9858
9859 (declare-function idna-to-unicode "ext:idna" (str))
9860
9861 (defun gnus-summary-idna-message (&optional arg)
9862   "Decode IDNA encoded domain names in the current articles.
9863 IDNA encoded domain names looks like `xn--bar'.  If a string
9864 remain unencoded after running this function, it is likely an
9865 invalid IDNA string (`xn--bar' is invalid).
9866
9867 You must have GNU Libidn (URL `http://www.gnu.org/software/libidn/')
9868 installed for this command to work."
9869   (interactive "P")
9870   (if (not (and (condition-case nil (require 'idna)
9871                   (file-error))
9872                 (mm-coding-system-p 'utf-8)
9873                 (symbol-value 'idna-program)
9874                 (executable-find (symbol-value 'idna-program))))
9875       (gnus-message
9876        5 "GNU Libidn not installed properly (`idn' or `idna.el' missing)")
9877     (gnus-summary-select-article)
9878     (let ((mail-header-separator ""))
9879       (gnus-eval-in-buffer-window gnus-article-buffer
9880         (save-restriction
9881           (widen)
9882           (let ((start (window-start))
9883                 buffer-read-only)
9884             (while (re-search-forward "\\(xn--[-0-9a-z]+\\)" nil t)
9885               (replace-match (idna-to-unicode (match-string 1))))
9886             (set-window-start (get-buffer-window (current-buffer)) start)))))))
9887
9888 (defun gnus-summary-morse-message (&optional arg)
9889   "Morse decode the current article."
9890   (interactive "P")
9891   (gnus-summary-select-article)
9892   (let ((mail-header-separator ""))
9893     (gnus-eval-in-buffer-window gnus-article-buffer
9894       (save-excursion
9895         (save-restriction
9896           (widen)
9897           (let ((pos (window-start))
9898                 (inhibit-read-only t))
9899             (goto-char (point-min))
9900             (when (message-goto-body)
9901               (gnus-narrow-to-body))
9902             (goto-char (point-min))
9903             (while (search-forward "·" (point-max) t)
9904               (replace-match "."))
9905             (unmorse-region (point-min) (point-max))
9906             (widen)
9907             (set-window-start (get-buffer-window (current-buffer)) pos)))))))
9908
9909 (defun gnus-summary-stop-page-breaking ()
9910   "Stop page breaking in the current article."
9911   (interactive)
9912   (gnus-summary-select-article)
9913   (gnus-eval-in-buffer-window gnus-article-buffer
9914     (widen)
9915     (when (gnus-visual-p 'page-marker)
9916       (let ((inhibit-read-only t))
9917         (gnus-remove-text-with-property 'gnus-prev)
9918         (gnus-remove-text-with-property 'gnus-next))
9919       (setq gnus-page-broken nil))))
9920
9921 (defun gnus-summary-move-article (&optional n to-newsgroup
9922                                             select-method action)
9923   "Move the current article to a different newsgroup.
9924 If N is a positive number, move the N next articles.
9925 If N is a negative number, move the N previous articles.
9926 If N is nil and any articles have been marked with the process mark,
9927 move those articles instead.
9928 If TO-NEWSGROUP is string, do not prompt for a newsgroup to move to.
9929 If SELECT-METHOD is non-nil, do not move to a specific newsgroup, but
9930 re-spool using this method.
9931
9932 When called interactively with TO-NEWSGROUP being nil, the value of
9933 the variable `gnus-move-split-methods' is used for finding a default
9934 for the target newsgroup.
9935
9936 For this function to work, both the current newsgroup and the
9937 newsgroup that you want to move to have to support the `request-move'
9938 and `request-accept' functions.
9939
9940 ACTION can be either `move' (the default), `crosspost' or `copy'."
9941   (interactive "P")
9942   (unless action
9943     (setq action 'move))
9944   ;; Check whether the source group supports the required functions.
9945   (cond ((and (eq action 'move)
9946               (not (gnus-check-backend-function
9947                     'request-move-article gnus-newsgroup-name)))
9948          (error "The current group does not support article moving"))
9949         ((and (eq action 'crosspost)
9950               (not (gnus-check-backend-function
9951                     'request-replace-article gnus-newsgroup-name)))
9952          (error "The current group does not support article editing")))
9953   (let ((articles (gnus-summary-work-articles n))
9954         (prefix (if (gnus-check-backend-function
9955                      'request-move-article gnus-newsgroup-name)
9956                     (funcall gnus-move-group-prefix-function
9957                              gnus-newsgroup-name)
9958                   ""))
9959         (names '((move "Move" "Moving")
9960                  (copy "Copy" "Copying")
9961                  (crosspost "Crosspost" "Crossposting")))
9962         (copy-buf (save-excursion
9963                     (nnheader-set-temp-buffer " *copy article*")))
9964         art-group to-method new-xref article to-groups
9965         articles-to-update-marks encoded)
9966     (unless (assq action names)
9967       (error "Unknown action %s" action))
9968     ;; Read the newsgroup name.
9969     (when (and (not to-newsgroup)
9970                (not select-method))
9971       (if (and gnus-move-split-methods
9972                (not
9973                 (and (memq gnus-current-article articles)
9974                      (gnus-buffer-live-p gnus-original-article-buffer))))
9975           ;; When `gnus-move-split-methods' is non-nil, we have to
9976           ;; select an article to give `gnus-read-move-group-name' an
9977           ;; opportunity to suggest an appropriate default.  However,
9978           ;; we needn't render or mark the article.
9979           (let ((gnus-display-mime-function nil)
9980                 (gnus-article-prepare-hook nil)
9981                 (gnus-mark-article-hook nil))
9982             (gnus-summary-select-article nil nil nil (car articles))))
9983       (setq to-newsgroup (gnus-read-move-group-name
9984                           (cadr (assq action names))
9985                           (symbol-value
9986                            (intern (format "gnus-current-%s-group" action)))
9987                           articles prefix)
9988             encoded to-newsgroup
9989             to-method (gnus-server-to-method (gnus-group-method to-newsgroup)))
9990       (set (intern (format "gnus-current-%s-group" action))
9991            (mm-decode-coding-string
9992             to-newsgroup
9993             (gnus-group-name-charset to-method to-newsgroup))))
9994     (unless to-method
9995       (setq to-method (or select-method
9996                           (gnus-server-to-method
9997                            (gnus-group-method to-newsgroup)))))
9998     (setq to-newsgroup
9999           (or encoded
10000               (and to-newsgroup
10001                    (mm-encode-coding-string
10002                     to-newsgroup
10003                     (gnus-group-name-charset to-method to-newsgroup)))))
10004     ;; Check the method we are to move this article to...
10005     (unless (gnus-check-backend-function
10006              'request-accept-article (car to-method))
10007       (error "%s does not support article copying" (car to-method)))
10008     (unless (gnus-check-server to-method)
10009       (error "Can't open server %s" (car to-method)))
10010     (gnus-message 6 "%s to %s: %s..."
10011                   (caddr (assq action names))
10012                   (or (car select-method)
10013                       (gnus-group-decoded-name to-newsgroup))
10014                   articles)
10015     (while articles
10016       (setq article (pop articles))
10017       ;; Set any marks that may have changed in the summary buffer.
10018       (when gnus-preserve-marks
10019         (gnus-summary-push-marks-to-backend article))
10020       (setq
10021        art-group
10022        (cond
10023         ;; Move the article.
10024         ((eq action 'move)
10025          ;; Remove this article from future suppression.
10026          (gnus-dup-unsuppress-article article)
10027          (let* ((from-method (gnus-find-method-for-group
10028                               gnus-newsgroup-name))
10029                 (to-method (or select-method
10030                                (gnus-find-method-for-group to-newsgroup)))
10031                 (move-is-internal (gnus-server-equal from-method to-method)))
10032            (gnus-request-move-article
10033             article                     ; Article to move
10034             gnus-newsgroup-name         ; From newsgroup
10035             (nth 1 (gnus-find-method-for-group
10036                     gnus-newsgroup-name)) ; Server
10037             (list 'gnus-request-accept-article
10038                   to-newsgroup (list 'quote select-method)
10039                   (not articles) t)     ; Accept form
10040             (not articles)              ; Only save nov last time
10041             (and move-is-internal
10042                  to-newsgroup           ; Not respooling
10043                                         ; Is this move internal?
10044                  (gnus-group-real-name to-newsgroup)))))
10045         ;; Copy the article.
10046         ((eq action 'copy)
10047          (with-current-buffer copy-buf
10048            (when (gnus-request-article-this-buffer article
10049                                                    gnus-newsgroup-name)
10050              (save-restriction
10051                (nnheader-narrow-to-headers)
10052                (dolist (hdr gnus-copy-article-ignored-headers)
10053                  (message-remove-header hdr t)))
10054              (gnus-request-accept-article
10055               to-newsgroup select-method (not articles) t))))
10056         ;; Crosspost the article.
10057         ((eq action 'crosspost)
10058          (let ((xref (message-tokenize-header
10059                       (mail-header-xref (gnus-summary-article-header
10060                                          article))
10061                       " ")))
10062            (setq new-xref (concat (gnus-group-real-name gnus-newsgroup-name)
10063                                   ":" (number-to-string article)))
10064            (unless xref
10065              (setq xref (list (system-name))))
10066            (setq new-xref
10067                  (concat
10068                   (mapconcat 'identity
10069                              (delete "Xref:" (delete new-xref xref))
10070                              " ")
10071                   " " new-xref))
10072            (with-current-buffer copy-buf
10073              ;; First put the article in the destination group.
10074              (gnus-request-article-this-buffer article gnus-newsgroup-name)
10075              (when (consp (setq art-group
10076                                 (gnus-request-accept-article
10077                                  to-newsgroup select-method (not articles)
10078                                  t)))
10079                (setq new-xref (concat new-xref " " (car art-group)
10080                                       ":"
10081                                       (number-to-string (cdr art-group))))
10082                ;; Now we have the new Xrefs header, so we insert
10083                ;; it and replace the new article.
10084                (nnheader-replace-header "Xref" new-xref)
10085                (gnus-request-replace-article
10086                 (cdr art-group) to-newsgroup (current-buffer) t)
10087                art-group))))))
10088       (cond
10089        ((not art-group)
10090         (gnus-message 1 "Couldn't %s article %s: %s"
10091                       (cadr (assq action names)) article
10092                       (nnheader-get-report (car to-method))))
10093        ((eq art-group 'junk)
10094         (when (eq action 'move)
10095           (gnus-summary-mark-article article gnus-canceled-mark)
10096           (gnus-message 4 "Deleted article %s" article)
10097           ;; run the delete hook
10098           (run-hook-with-args 'gnus-summary-article-delete-hook
10099                               action
10100                               (gnus-data-header
10101                                (assoc article (gnus-data-list nil)))
10102                               gnus-newsgroup-name nil
10103                               select-method)))
10104        (t
10105         (let* ((pto-group (gnus-group-prefixed-name
10106                            (car art-group) to-method))
10107                (info (gnus-get-info pto-group))
10108                (to-group (gnus-info-group info))
10109                to-marks)
10110           ;; Update the group that has been moved to.
10111           (when (and info
10112                      (memq action '(move copy)))
10113             (unless (member to-group to-groups)
10114               (push to-group to-groups))
10115
10116             (when (and (not (memq article gnus-newsgroup-unreads))
10117                        (cdr art-group))
10118               (push 'read to-marks)
10119               (gnus-info-set-read
10120                info (gnus-add-to-range (gnus-info-read info)
10121                                        (list (cdr art-group)))))
10122
10123             ;; See whether the article is to be put in the cache.
10124             (let* ((expirable (gnus-group-auto-expirable-p to-group))
10125                    (marks (if expirable
10126                               gnus-article-mark-lists
10127                             (delete '(expirable . expire)
10128                                     (copy-sequence
10129                                      gnus-article-mark-lists))))
10130                    (to-article (cdr art-group)))
10131
10132               ;; Enter the article into the cache in the new group,
10133               ;; if that is required.
10134               (when (and to-article
10135                          gnus-use-cache)
10136                 (gnus-cache-possibly-enter-article
10137                  to-group to-article
10138                  (memq article gnus-newsgroup-marked)
10139                  (memq article gnus-newsgroup-dormant)
10140                  (memq article gnus-newsgroup-unreads)))
10141
10142               (when (and gnus-preserve-marks
10143                          to-article)
10144                 ;; Copy any marks over to the new group.
10145                 (when (and (equal to-group gnus-newsgroup-name)
10146                            (not (memq article gnus-newsgroup-unreads)))
10147                   ;; Mark this article as read in this group.
10148                   (push (cons to-article gnus-read-mark)
10149                         gnus-newsgroup-reads)
10150                   ;; Increase the active status of this group.
10151                   (setcdr (gnus-active to-group) to-article)
10152                   (setcdr gnus-newsgroup-active to-article))
10153
10154                 (while marks
10155                   (when (eq (gnus-article-mark-to-type (cdar marks)) 'list)
10156                     (when (memq article (symbol-value
10157                                          (intern (format "gnus-newsgroup-%s"
10158                                                          (caar marks)))))
10159                       (push (cdar marks) to-marks)
10160                       ;; If the other group is the same as this group,
10161                       ;; then we have to add the mark to the list.
10162                       (when (equal to-group gnus-newsgroup-name)
10163                         (set (intern (format "gnus-newsgroup-%s"
10164                                              (caar marks)))
10165                              (cons to-article
10166                                    (symbol-value
10167                                     (intern (format "gnus-newsgroup-%s"
10168                                                     (caar marks)))))))
10169                       ;; Copy the marks to other group.
10170                       (gnus-add-marked-articles
10171                        to-group (cdar marks) (list to-article) info)))
10172                   (setq marks (cdr marks)))
10173
10174                 (when (and expirable
10175                            gnus-mark-copied-or-moved-articles-as-expirable
10176                            (not (memq 'expire to-marks)))
10177                   ;; Mark this article as expirable.
10178                   (push 'expire to-marks)
10179                   (when (equal to-group gnus-newsgroup-name)
10180                     (push to-article gnus-newsgroup-expirable))
10181                   ;; Copy the expirable mark to other group.
10182                   (gnus-add-marked-articles
10183                    to-group 'expire (list to-article) info))
10184
10185                 (when (and to-marks
10186                            (gnus-method-option-p
10187                             (gnus-find-method-for-group to-group)
10188                             'server-marks))
10189                   (gnus-request-set-mark
10190                    to-group (list (list (list to-article) 'add to-marks)))))
10191
10192               (gnus-dribble-enter
10193                (concat "(gnus-group-set-info '"
10194                        (gnus-prin1-to-string (gnus-get-info to-group))
10195                        ")")
10196                (concat "^(gnus-group-set-info '(\""
10197                        (regexp-quote to-group) "\""))))
10198
10199           ;; Update the Xref header in this article to point to
10200           ;; the new crossposted article we have just created.
10201           (when (eq action 'crosspost)
10202             (with-current-buffer copy-buf
10203               (gnus-request-article-this-buffer article gnus-newsgroup-name)
10204               (nnheader-replace-header "Xref" new-xref)
10205               (gnus-request-replace-article
10206                article gnus-newsgroup-name (current-buffer) t)))
10207
10208           ;; run the move/copy/crosspost/respool hook
10209           (run-hook-with-args 'gnus-summary-article-move-hook
10210                               action
10211                               (gnus-data-header
10212                                (assoc article (gnus-data-list nil)))
10213                               gnus-newsgroup-name
10214                               to-newsgroup
10215                               select-method))
10216
10217         ;;;!!!Why is this necessary?
10218         (set-buffer gnus-summary-buffer)
10219
10220         (when (eq action 'move)
10221           (save-excursion
10222             (gnus-summary-goto-subject article)
10223             (gnus-summary-mark-article article gnus-canceled-mark)))))
10224       (push article articles-to-update-marks))
10225
10226     (save-excursion
10227       (apply 'gnus-summary-remove-process-mark articles-to-update-marks))
10228     ;; Re-activate all groups that have been moved to.
10229     (with-current-buffer gnus-group-buffer
10230       (let ((gnus-group-marked to-groups))
10231         (gnus-group-get-new-news-this-group nil t)))
10232
10233     (gnus-kill-buffer copy-buf)
10234     (gnus-summary-position-point)
10235     (gnus-set-mode-line 'summary)))
10236
10237 (defun gnus-summary-push-marks-to-backend (article)
10238   (let ((set nil)
10239         (del nil)
10240         (marks gnus-article-mark-lists))
10241     (unless (memq article gnus-newsgroup-unreads)
10242       (push 'read set))
10243     (while marks
10244       (if (and (eq (gnus-article-mark-to-type (cdar marks)) 'list)
10245                (memq article (symbol-value
10246                               (intern (format "gnus-newsgroup-%s"
10247                                               (caar marks))))))
10248           (push (cdar marks) set)
10249         (push (cdar marks) del))
10250       (pop marks))
10251     (gnus-request-set-mark gnus-newsgroup-name `(((,article) set ,set)
10252                                                  ((,article) del ,del)))))
10253
10254 (defun gnus-summary-copy-article (&optional n to-newsgroup select-method)
10255   "Copy the current article to some other group.
10256 If TO-NEWSGROUP is string, do not prompt for a newsgroup to copy to.
10257 When called interactively, if TO-NEWSGROUP is nil, use the value of
10258 the variable `gnus-move-split-methods' for finding a default target
10259 newsgroup.
10260 If SELECT-METHOD is non-nil, do not move to a specific newsgroup, but
10261 re-spool using this method."
10262   (interactive "P")
10263   (gnus-summary-move-article n to-newsgroup select-method 'copy))
10264
10265 (defun gnus-summary-crosspost-article (&optional n)
10266   "Crosspost the current article to some other group."
10267   (interactive "P")
10268   (gnus-summary-move-article n nil nil 'crosspost))
10269
10270 (defcustom gnus-summary-respool-default-method nil
10271   "Default method type for respooling an article.
10272 If nil, use to the current newsgroup method."
10273   :type 'symbol
10274   :group 'gnus-summary-mail)
10275
10276 (defun gnus-summary-respool-article (&optional n method)
10277   "Respool the current article.
10278 The article will be squeezed through the mail spooling process again,
10279 which means that it will be put in some mail newsgroup or other
10280 depending on `nnmail-split-methods'.
10281 If N is a positive number, respool the N next articles.
10282 If N is a negative number, respool the N previous articles.
10283 If N is nil and any articles have been marked with the process mark,
10284 respool those articles instead.
10285
10286 Respooling can be done both from mail groups and \"real\" newsgroups.
10287 In the former case, the articles in question will be moved from the
10288 current group into whatever groups they are destined to.  In the
10289 latter case, they will be copied into the relevant groups."
10290   (interactive
10291    (list current-prefix-arg
10292          (let* ((methods (mapcar #'car (gnus-methods-using 'respool)))
10293                 (methname
10294                  (symbol-name (or gnus-summary-respool-default-method
10295                                   (car (gnus-find-method-for-group
10296                                         gnus-newsgroup-name)))))
10297                 (method
10298                  (gnus-completing-read
10299                   "Backend to use when respooling"
10300                   methods t nil 'gnus-mail-method-history methname))
10301                 ms)
10302            (cond
10303             ((zerop (length (setq ms (gnus-servers-using-backend
10304                                       (intern method)))))
10305              (list (intern method) ""))
10306             ((= 1 (length ms))
10307              (car ms))
10308             (t
10309              (let ((ms-alist (mapcar (lambda (m) (cons (cadr m) m)) ms)))
10310                (cdr (assoc (gnus-completing-read "Server name" ms-alist t)
10311                            ms-alist))))))))
10312   (unless method
10313     (error "No method given for respooling"))
10314   (if (assoc (symbol-name
10315               (car (gnus-find-method-for-group gnus-newsgroup-name)))
10316              (gnus-methods-using 'respool))
10317       (gnus-summary-move-article n nil method)
10318     (gnus-summary-copy-article n nil method)))
10319
10320 (defun gnus-summary-import-article (file &optional edit)
10321   "Import an arbitrary file into a mail newsgroup."
10322   (interactive "fImport file: \nP")
10323   (let ((group gnus-newsgroup-name)
10324         (now (current-time))
10325         atts lines group-art)
10326     (unless (gnus-check-backend-function 'request-accept-article group)
10327       (error "%s does not support article importing" group))
10328     (or (file-readable-p file)
10329         (not (file-regular-p file))
10330         (error "Can't read %s" file))
10331     (with-current-buffer (gnus-get-buffer-create " *import file*")
10332       (erase-buffer)
10333       (nnheader-insert-file-contents file)
10334       (goto-char (point-min))
10335       (if (nnheader-article-p)
10336           (save-restriction
10337             (goto-char (point-min))
10338             (search-forward "\n\n" nil t)
10339             (narrow-to-region (point-min) (1- (point)))
10340             (goto-char (point-min))
10341             (unless (re-search-forward "^date:" nil t)
10342               (goto-char (point-max))
10343               (insert "Date: " (message-make-date (nth 5 atts)) "\n")))
10344        ;; This doesn't look like an article, so we fudge some headers.
10345         (setq atts (file-attributes file)
10346               lines (count-lines (point-min) (point-max)))
10347         (insert "From: " (read-string "From: ") "\n"
10348                 "Subject: " (read-string "Subject: ") "\n"
10349                 "Date: " (message-make-date (nth 5 atts)) "\n"
10350                 "Message-ID: " (message-make-message-id) "\n"
10351                 "Lines: " (int-to-string lines) "\n"
10352                 "Chars: " (int-to-string (nth 7 atts)) "\n\n"))
10353       (setq group-art (gnus-request-accept-article group nil t))
10354       (kill-buffer (current-buffer)))
10355     (setq gnus-newsgroup-active (gnus-activate-group group))
10356     (forward-line 1)
10357     (gnus-summary-goto-article (cdr group-art) nil t)
10358     (when edit
10359       (gnus-summary-edit-article))))
10360
10361 (defun gnus-summary-create-article ()
10362   "Create an article in a mail newsgroup."
10363   (interactive)
10364   (let ((group gnus-newsgroup-name)
10365         (now (current-time))
10366         group-art)
10367     (unless (gnus-check-backend-function 'request-accept-article group)
10368       (error "%s does not support article importing" group))
10369     (with-current-buffer (gnus-get-buffer-create " *import file*")
10370       (erase-buffer)
10371       (goto-char (point-min))
10372       ;; This doesn't look like an article, so we fudge some headers.
10373       (insert "From: " (read-string "From: ") "\n"
10374               "Subject: " (read-string "Subject: ") "\n"
10375               "Date: " (message-make-date now) "\n"
10376               "Message-ID: " (message-make-message-id) "\n")
10377       (setq group-art (gnus-request-accept-article group nil t))
10378       (kill-buffer (current-buffer)))
10379     (setq gnus-newsgroup-active (gnus-activate-group group))
10380     (forward-line 1)
10381     (gnus-summary-goto-article (cdr group-art) nil t)
10382     (gnus-summary-edit-article)))
10383
10384 (defun gnus-summary-article-posted-p ()
10385   "Say whether the current (mail) article is available from news as well.
10386 This will be the case if the article has both been mailed and posted."
10387   (interactive)
10388   (let ((id (mail-header-references (gnus-summary-article-header)))
10389         (gnus-override-method (car (gnus-refer-article-methods))))
10390     (if (gnus-request-head id "")
10391         (gnus-message 2 "The current message was found on %s"
10392                       gnus-override-method)
10393       (gnus-message 2 "The current message couldn't be found on %s"
10394                     gnus-override-method)
10395       nil)))
10396
10397 (defun gnus-summary-expire-articles (&optional now)
10398   "Expire all articles that are marked as expirable in the current group."
10399   (interactive)
10400   (when (and (not gnus-group-is-exiting-without-update-p)
10401              (gnus-check-backend-function
10402               'request-expire-articles gnus-newsgroup-name))
10403     ;; This backend supports expiry.
10404     (let* ((total (gnus-group-total-expirable-p gnus-newsgroup-name))
10405            (expirable
10406             (gnus-list-range-difference
10407              (if total
10408                  (progn
10409                    ;; We need to update the info for
10410                    ;; this group for `gnus-list-of-read-articles'
10411                    ;; to give us the right answer.
10412                    (gnus-run-hooks 'gnus-exit-group-hook)
10413                    (gnus-summary-update-info)
10414                    (gnus-list-of-read-articles gnus-newsgroup-name))
10415                (setq gnus-newsgroup-expirable
10416                      (sort gnus-newsgroup-expirable '<)))
10417              gnus-newsgroup-unexist))
10418            (expiry-wait (if now 'immediate
10419                           (gnus-group-find-parameter
10420                            gnus-newsgroup-name 'expiry-wait)))
10421            (nnmail-expiry-target
10422             (or (gnus-group-find-parameter gnus-newsgroup-name 'expiry-target)
10423                 nnmail-expiry-target))
10424            es)
10425       (when expirable
10426         ;; There are expirable articles in this group, so we run them
10427         ;; through the expiry process.
10428         (gnus-message 6 "Expiring articles...")
10429         (when (gnus-check-group gnus-newsgroup-name)
10430           ;; The list of articles that weren't expired is returned.
10431           (save-excursion
10432             (if expiry-wait
10433                 (let ((nnmail-expiry-wait-function nil)
10434                       (nnmail-expiry-wait expiry-wait))
10435                   (setq es (gnus-request-expire-articles
10436                             expirable gnus-newsgroup-name)))
10437               (setq es (gnus-request-expire-articles
10438                         expirable gnus-newsgroup-name)))
10439             (unless total
10440               (setq gnus-newsgroup-expirable es))
10441             ;; We go through the old list of expirable, and mark all
10442             ;; really expired articles as nonexistent.
10443             (unless (eq es expirable) ;If nothing was expired, we don't mark.
10444               (let ((gnus-use-cache nil))
10445                 (dolist (article expirable)
10446                   (when (and (not (memq article es))
10447                              (gnus-data-find article))
10448                     (gnus-summary-mark-article article gnus-canceled-mark)
10449                     (run-hook-with-args
10450                      'gnus-summary-article-expire-hook
10451                      'delete
10452                      (gnus-data-header (assoc article (gnus-data-list nil)))
10453                      gnus-newsgroup-name
10454                      (cond
10455                       ((stringp nnmail-expiry-target) nnmail-expiry-target)
10456                       ((eq nnmail-expiry-target 'delete) nil)
10457                       (t
10458                        (let ((rescall (funcall nnmail-expiry-target
10459                                                gnus-newsgroup-name)))
10460                          (if (stringp rescall) rescall nil))))
10461                      nil)))))))
10462         (gnus-message 6 "Expiring articles...done")))))
10463
10464 (defun gnus-summary-expire-articles-now ()
10465   "Expunge all expirable articles in the current group.
10466 This means that *all* articles that are marked as expirable will be
10467 deleted forever, right now."
10468   (interactive)
10469   (or gnus-expert-user
10470       (gnus-yes-or-no-p
10471        "Are you really, really sure you want to delete all expirable messages? ")
10472       (error "Phew!"))
10473   (gnus-summary-expire-articles t))
10474
10475 ;; Suggested by Jack Vinson <vinson@unagi.cis.upenn.edu>.
10476 (defun gnus-summary-delete-article (&optional n)
10477   "Delete the N next (mail) articles.
10478 This command actually deletes articles.  This is not a marking
10479 command.  The article will disappear forever from your life, never to
10480 return.
10481
10482 If N is negative, delete backwards.
10483 If N is nil and articles have been marked with the process mark,
10484 delete these instead.
10485
10486 If `gnus-novice-user' is non-nil you will be asked for
10487 confirmation before the articles are deleted."
10488   (interactive "P")
10489   (unless (gnus-check-backend-function 'request-expire-articles
10490                                        gnus-newsgroup-name)
10491     (error "The current newsgroup does not support article deletion"))
10492   (unless (gnus-check-server (gnus-find-method-for-group gnus-newsgroup-name))
10493     (error "Couldn't open server"))
10494   ;; Compute the list of articles to delete.
10495   (let ((articles (sort (copy-sequence (gnus-summary-work-articles n)) '<))
10496         (nnmail-expiry-target 'delete)
10497         not-deleted)
10498     (if (and gnus-novice-user
10499              (not (gnus-yes-or-no-p
10500                    (format "Do you really want to delete %s forever? "
10501                            (if (> (length articles) 1)
10502                                (format "these %s articles" (length articles))
10503                              "this article")))))
10504         ()
10505       ;; Delete the articles.
10506       (setq not-deleted (gnus-request-expire-articles
10507                          articles gnus-newsgroup-name 'force))
10508       (save-excursion
10509         (while articles
10510           (gnus-summary-remove-process-mark (car articles))
10511           ;; The backend might not have been able to delete the article
10512           ;; after all.
10513           (unless (memq (car articles) not-deleted)
10514             (gnus-summary-mark-article (car articles) gnus-canceled-mark)
10515             (let* ((article (car articles))
10516                    (ghead  (gnus-data-header
10517                             (assoc article (gnus-data-list nil)))))
10518               (run-hook-with-args 'gnus-summary-article-delete-hook
10519                                   'delete ghead gnus-newsgroup-name nil
10520                                   nil)))
10521           (setq articles (cdr articles))))
10522       (when not-deleted
10523         (gnus-message 4 "Couldn't delete articles %s" not-deleted)))
10524     (gnus-summary-position-point)
10525     (gnus-set-mode-line 'summary)
10526     not-deleted))
10527
10528 (defun gnus-summary-edit-article (&optional arg)
10529   "Edit the current article.
10530 This will have permanent effect only in mail groups.
10531 If ARG is nil, edit the decoded articles.
10532 If ARG is 1, edit the raw articles.
10533 If ARG is 2, edit the raw articles even in read-only groups.
10534 If ARG is 3, edit the articles with the current handles.
10535 Otherwise, allow editing of articles even in read-only
10536 groups."
10537   (interactive "P")
10538   (let (force raw current-handles)
10539     (cond
10540      ((null arg))
10541      ((eq arg 1)
10542       (setq raw t))
10543      ((eq arg 2)
10544       (setq raw t
10545             force t))
10546      ((eq arg 3)
10547       (setq current-handles
10548             (and (gnus-buffer-live-p gnus-article-buffer)
10549                  (with-current-buffer gnus-article-buffer
10550                    (prog1
10551                        gnus-article-mime-handles
10552                      (setq gnus-article-mime-handles nil))))))
10553      (t
10554       (setq force t)))
10555     (when (and raw (not force)
10556                (member gnus-newsgroup-name '("nndraft:delayed"
10557                                              "nndraft:drafts"
10558                                              "nndraft:queue")))
10559       (error "Can't edit the raw article in group %s"
10560              gnus-newsgroup-name))
10561     (with-current-buffer gnus-summary-buffer
10562       (let ((mail-parse-charset gnus-newsgroup-charset)
10563             (mail-parse-ignored-charsets gnus-newsgroup-ignored-charsets))
10564         (gnus-set-global-variables)
10565         (when (and (not force)
10566                    (gnus-group-read-only-p))
10567           (error "The current newsgroup does not support article editing"))
10568         (gnus-summary-show-article t)
10569         (when (and (not raw) (gnus-buffer-live-p gnus-article-buffer))
10570           (with-current-buffer gnus-article-buffer
10571             (mm-enable-multibyte)))
10572         (if (member gnus-newsgroup-name '("nndraft:delayed" "nndraft:drafts"))
10573             (setq raw t))
10574         (gnus-article-edit-article
10575          (if raw 'ignore
10576            `(lambda ()
10577               (let ((mbl mml-buffer-list))
10578                 (setq mml-buffer-list nil)
10579                 (let ((rfc2047-quote-decoded-words-containing-tspecials t))
10580                   (mime-to-mml ,'current-handles))
10581                 (let ((mbl1 mml-buffer-list))
10582                   (setq mml-buffer-list mbl)
10583                   (set (make-local-variable 'mml-buffer-list) mbl1))
10584                 (gnus-make-local-hook 'kill-buffer-hook)
10585                 (add-hook 'kill-buffer-hook 'mml-destroy-buffers t t))))
10586          `(lambda (no-highlight)
10587             (let ((mail-parse-charset ',gnus-newsgroup-charset)
10588                   (message-options message-options)
10589                   (message-options-set-recipient)
10590                   (mail-parse-ignored-charsets
10591                    ',gnus-newsgroup-ignored-charsets)
10592                   (rfc2047-header-encoding-alist
10593                    ',(let ((charset (gnus-group-name-charset
10594                                      (gnus-find-method-for-group
10595                                       gnus-newsgroup-name)
10596                                      gnus-newsgroup-name)))
10597                        (append (list (cons "Newsgroups" charset)
10598                                      (cons "Followup-To" charset)
10599                                      (cons "Xref" charset))
10600                                rfc2047-header-encoding-alist))))
10601               ,(if (not raw) '(progn
10602                                 (mml-to-mime)
10603                                 (mml-destroy-buffers)
10604                                 (remove-hook 'kill-buffer-hook
10605                                              'mml-destroy-buffers t)
10606                                 (kill-local-variable 'mml-buffer-list)))
10607               (gnus-summary-edit-article-done
10608                ,(or (mail-header-references gnus-current-headers) "")
10609                ,(gnus-group-read-only-p)
10610                ,gnus-summary-buffer no-highlight))))))))
10611
10612 (defalias 'gnus-summary-edit-article-postpone 'gnus-article-edit-exit)
10613
10614 (defun gnus-summary-edit-article-done (&optional references read-only buffer
10615                                                  no-highlight)
10616   "Make edits to the current article permanent."
10617   (interactive)
10618   (save-excursion
10619     ;; The buffer restriction contains the entire article if it exists.
10620     (when (article-goto-body)
10621       (let ((lines (count-lines (point) (point-max)))
10622             (length (- (point-max) (point)))
10623             (case-fold-search t)
10624             (body (point-marker)))
10625         (goto-char (point-min))
10626         (when (re-search-forward "^content-length:[ \t]\\([0-9]+\\)" body t)
10627           (delete-region (match-beginning 1) (match-end 1))
10628           (insert (number-to-string length)))
10629         (goto-char (point-min))
10630         (when (re-search-forward
10631                "^x-content-length:[ \t]\\([0-9]+\\)" body t)
10632           (delete-region (match-beginning 1) (match-end 1))
10633           (insert (number-to-string length)))
10634         (goto-char (point-min))
10635         (when (re-search-forward "^lines:[ \t]\\([0-9]+\\)" body t)
10636           (delete-region (match-beginning 1) (match-end 1))
10637           (insert (number-to-string lines))))))
10638   ;; Replace the article.
10639   (let ((buf (current-buffer))
10640         (article (cdr gnus-article-current))
10641         replace-result)
10642     (with-temp-buffer
10643       (insert-buffer-substring buf)
10644       (if (and (not read-only)
10645                (not (setq replace-result
10646                           (gnus-request-replace-article
10647                            article (car gnus-article-current)
10648                            (current-buffer) t))))
10649           (error "Couldn't replace article")
10650         ;; If we got a number back, then that's the new article number
10651         ;; for this article.  Otherwise, the article number didn't change.
10652         (when (numberp replace-result)
10653           (with-current-buffer gnus-summary-buffer
10654             (setq gnus-newsgroup-limit (delq article gnus-newsgroup-limit))
10655             (gnus-summary-limit gnus-newsgroup-limit)
10656             (setq article replace-result)
10657             (gnus-summary-goto-subject article t)))
10658         ;; Update the summary buffer.
10659         (if (and references
10660                  (equal (message-tokenize-header references " ")
10661                         (message-tokenize-header
10662                          (or (message-fetch-field "references") "") " ")))
10663             ;; We only have to update this line.
10664             (save-excursion
10665               (save-restriction
10666                 (message-narrow-to-head)
10667                 (let ((head (buffer-substring-no-properties
10668                              (point-min) (point-max)))
10669                       header)
10670                   (with-temp-buffer
10671                     (insert (format "211 %d Article retrieved.\n" article))
10672                     (insert head)
10673                     (insert ".\n")
10674                     (let ((nntp-server-buffer (current-buffer)))
10675                       (setq header (car (gnus-get-newsgroup-headers nil t))))
10676                     (with-current-buffer gnus-summary-buffer
10677                       (gnus-data-set-header (gnus-data-find article) header)
10678                       (gnus-summary-update-article-line article header)
10679                       (if (gnus-summary-goto-subject article nil t)
10680                           (gnus-summary-update-secondary-mark article)))))))
10681           ;; Update threads.
10682           (set-buffer (or buffer gnus-summary-buffer))
10683           (gnus-summary-update-article article)
10684           (if (gnus-summary-goto-subject article nil t)
10685               (gnus-summary-update-secondary-mark article)))
10686         ;; Prettify the article buffer again.
10687         (unless no-highlight
10688           (with-current-buffer gnus-article-buffer
10689             ;;!!! Fix this -- article should be rehighlighted.
10690             ;;(gnus-run-hooks 'gnus-article-display-hook)
10691             (set-buffer gnus-original-article-buffer)
10692             (gnus-request-article
10693              article (car gnus-article-current) (current-buffer))))
10694         ;; Prettify the summary buffer line.
10695         (when (gnus-visual-p 'summary-highlight 'highlight)
10696           (gnus-run-hooks 'gnus-visual-mark-article-hook))))))
10697
10698 (defun gnus-summary-edit-wash (key)
10699   "Perform editing command KEY in the article buffer."
10700   (interactive
10701    (list
10702     (progn
10703       (message "%s" (concat (this-command-keys) "- "))
10704       (read-char))))
10705   (message "")
10706   (gnus-summary-edit-article)
10707   (execute-kbd-macro (concat (this-command-keys) key))
10708   (gnus-article-edit-done))
10709
10710 ;;; Respooling
10711
10712 (defvar nnimap-split-fancy)
10713 (defvar nnimap-split-methods)
10714
10715 (defun gnus-summary-respool-query (&optional silent trace)
10716   "Query where the respool algorithm would put this article."
10717   (interactive)
10718   (let (gnus-mark-article-hook)
10719     (gnus-summary-select-article)
10720     (with-current-buffer gnus-original-article-buffer
10721       (let ((groups
10722              (if (eq (car (gnus-find-method-for-group gnus-newsgroup-name))
10723                      'nnimap)
10724                  ;; nnimap has its own splitting variables.
10725                  (let ((nnmail-split-methods
10726                         (cond
10727                          ((eq nnimap-split-methods 'default)
10728                           nnmail-split-methods)
10729                          (nnimap-split-methods
10730                           nnimap-split-methods)
10731                          (nnimap-split-fancy
10732                           'nnmail-split-fancy)))
10733                        (nnmail-split-fancy (or nnimap-split-fancy
10734                                                nnmail-split-fancy)))
10735                    (nnmail-article-group 'identity trace))
10736                (nnmail-article-group 'identity trace))))
10737         (unless silent
10738           (if groups
10739               (message "This message would go to %s"
10740                        (mapconcat 'car groups ", "))
10741             (message "This message would go to no groups"))
10742           groups)))))
10743
10744 (defun gnus-summary-respool-trace ()
10745   "Trace where the respool algorithm would put this article.
10746 Display a buffer showing all fancy splitting patterns which matched."
10747   (interactive)
10748   (gnus-summary-respool-query nil t))
10749
10750 ;; Summary marking commands.
10751
10752 (defun gnus-summary-kill-same-subject-and-select (&optional unmark)
10753   "Mark articles which has the same subject as read, and then select the next.
10754 If UNMARK is positive, remove any kind of mark.
10755 If UNMARK is negative, tick articles."
10756   (interactive "P")
10757   (when unmark
10758     (setq unmark (prefix-numeric-value unmark)))
10759   (let ((count
10760          (gnus-summary-mark-same-subject
10761           (gnus-summary-article-subject) unmark)))
10762     ;; Select next unread article.  If auto-select-same mode, should
10763     ;; select the first unread article.
10764     (gnus-summary-next-article t (and gnus-auto-select-same
10765                                       (gnus-summary-article-subject)))
10766     (gnus-message 7 "%d article%s marked as %s"
10767                   count (if (= count 1) " is" "s are")
10768                   (if unmark "unread" "read"))))
10769
10770 (defun gnus-summary-kill-same-subject (&optional unmark)
10771   "Mark articles which has the same subject as read.
10772 If UNMARK is positive, remove any kind of mark.
10773 If UNMARK is negative, tick articles."
10774   (interactive "P")
10775   (when unmark
10776     (setq unmark (prefix-numeric-value unmark)))
10777   (let ((count
10778          (gnus-summary-mark-same-subject
10779           (gnus-summary-article-subject) unmark)))
10780     ;; If marked as read, go to next unread subject.
10781     (when (null unmark)
10782       ;; Go to next unread subject.
10783       (gnus-summary-next-subject 1 t))
10784     (gnus-message 7 "%d articles are marked as %s"
10785                   count (if unmark "unread" "read"))))
10786
10787 (defun gnus-summary-mark-same-subject (subject &optional unmark)
10788   "Mark articles with same SUBJECT as read, and return marked number.
10789 If optional argument UNMARK is positive, remove any kinds of marks.
10790 If optional argument UNMARK is negative, mark articles as unread instead."
10791   (let ((count 1))
10792     (save-excursion
10793       (cond
10794        ((null unmark)                   ; Mark as read.
10795         (while (and
10796                 (progn
10797                   (gnus-summary-mark-article-as-read gnus-killed-mark)
10798                   (gnus-summary-show-thread) t)
10799                 (gnus-summary-find-subject subject))
10800           (setq count (1+ count))))
10801        ((> unmark 0)                    ; Tick.
10802         (while (and
10803                 (progn
10804                   (gnus-summary-mark-article-as-unread gnus-ticked-mark)
10805                   (gnus-summary-show-thread) t)
10806                 (gnus-summary-find-subject subject))
10807           (setq count (1+ count))))
10808        (t                               ; Mark as unread.
10809         (while (and
10810                 (progn
10811                   (gnus-summary-mark-article-as-unread gnus-unread-mark)
10812                   (gnus-summary-show-thread) t)
10813                 (gnus-summary-find-subject subject))
10814           (setq count (1+ count)))))
10815       (gnus-set-mode-line 'summary)
10816       ;; Return the number of marked articles.
10817       count)))
10818
10819 (defun gnus-summary-mark-as-processable (n &optional unmark)
10820   "Set the process mark on the next N articles.
10821 If N is negative, mark backward instead.  If UNMARK is non-nil, remove
10822 the process mark instead.  The difference between N and the actual
10823 number of articles marked is returned."
10824   (interactive "P")
10825   (if (and (null n) (gnus-region-active-p))
10826       (gnus-uu-mark-region (region-beginning) (region-end) unmark)
10827     (setq n (prefix-numeric-value n))
10828     (let ((backward (< n 0))
10829           (n (abs n)))
10830       (while (and
10831               (> n 0)
10832               (if unmark
10833                   (gnus-summary-remove-process-mark
10834                    (gnus-summary-article-number))
10835                 (gnus-summary-set-process-mark (gnus-summary-article-number)))
10836               (zerop (gnus-summary-next-subject (if backward -1 1) nil t)))
10837         (setq n (1- n)))
10838       (when (/= 0 n)
10839         (gnus-message 7 "No more articles"))
10840       (gnus-summary-recenter)
10841       (gnus-summary-position-point)
10842       n)))
10843
10844 (defun gnus-summary-unmark-as-processable (n)
10845   "Remove the process mark from the next N articles.
10846 If N is negative, unmark backward instead.  The difference between N and
10847 the actual number of articles unmarked is returned."
10848   (interactive "P")
10849   (gnus-summary-mark-as-processable n t))
10850
10851 (defun gnus-summary-unmark-all-processable ()
10852   "Remove the process mark from all articles."
10853   (interactive)
10854   (save-excursion
10855     (while gnus-newsgroup-processable
10856       (gnus-summary-remove-process-mark (car gnus-newsgroup-processable))))
10857   (gnus-summary-position-point))
10858
10859 (defun gnus-summary-add-mark (article type)
10860   "Mark ARTICLE with a mark of TYPE."
10861   (let ((vtype (car (assq type gnus-article-mark-lists)))
10862         var)
10863     (if (not vtype)
10864         (error "No such mark type: %s" type)
10865       (setq var (intern (format "gnus-newsgroup-%s" type)))
10866       (set var (cons article (symbol-value var)))
10867       (if (memq type '(processable cached replied forwarded recent saved))
10868           (gnus-summary-update-secondary-mark article)
10869         ;;; !!! This is bogus.  We should find out what primary
10870         ;;; !!! mark we want to set.
10871         (gnus-summary-update-mark gnus-del-mark 'unread)))))
10872
10873 (defun gnus-summary-mark-as-expirable (n)
10874   "Mark N articles forward as expirable.
10875 If N is negative, mark backward instead.  The difference between N and
10876 the actual number of articles marked is returned."
10877   (interactive "p")
10878   (gnus-summary-mark-forward n gnus-expirable-mark))
10879
10880 (defun gnus-summary-mark-as-spam (n)
10881   "Mark N articles forward as spam.
10882 If N is negative, mark backward instead.  The difference between N and
10883 the actual number of articles marked is returned."
10884   (interactive "p")
10885   (gnus-summary-mark-forward n gnus-spam-mark))
10886
10887 (defun gnus-summary-mark-article-as-replied (article)
10888   "Mark ARTICLE as replied to and update the summary line.
10889 ARTICLE can also be a list of articles."
10890   (interactive (list (gnus-summary-article-number)))
10891   (let ((articles (if (listp article) article (list article))))
10892     (dolist (article articles)
10893       (unless (numberp article)
10894         (error "%s is not a number" article))
10895       (push article gnus-newsgroup-replied)
10896       (let ((inhibit-read-only t))
10897         (when (gnus-summary-goto-subject article nil t)
10898           (gnus-summary-update-secondary-mark article))))))
10899
10900 (defun gnus-summary-mark-article-as-forwarded (article)
10901   "Mark ARTICLE as forwarded and update the summary line.
10902 ARTICLE can also be a list of articles."
10903   (let ((articles (if (listp article) article (list article))))
10904     (dolist (article articles)
10905       (push article gnus-newsgroup-forwarded)
10906       (let ((inhibit-read-only t))
10907         (when (gnus-summary-goto-subject article nil t)
10908           (gnus-summary-update-secondary-mark article))))))
10909
10910 (defun gnus-summary-set-bookmark (article)
10911   "Set a bookmark in current article."
10912   (interactive (list (gnus-summary-article-number)))
10913   (when (or (not (get-buffer gnus-article-buffer))
10914             (not gnus-current-article)
10915             (not gnus-article-current)
10916             (not (equal gnus-newsgroup-name (car gnus-article-current))))
10917     (error "No current article selected"))
10918   ;; Remove old bookmark, if one exists.
10919   (gnus-alist-pull article gnus-newsgroup-bookmarks)
10920   ;; Set the new bookmark, which is on the form
10921   ;; (article-number . line-number-in-body).
10922   (push
10923    (cons article
10924          (with-current-buffer gnus-article-buffer
10925            (count-lines
10926             (min (point)
10927                  (save-excursion
10928                    (article-goto-body)
10929                    (point)))
10930             (point))))
10931    gnus-newsgroup-bookmarks)
10932   (gnus-message 6 "A bookmark has been added to the current article."))
10933
10934 (defun gnus-summary-remove-bookmark (article)
10935   "Remove the bookmark from the current article."
10936   (interactive (list (gnus-summary-article-number)))
10937   ;; Remove old bookmark, if one exists.
10938   (if (not (assq article gnus-newsgroup-bookmarks))
10939       (gnus-message 6 "No bookmark in current article.")
10940     (gnus-alist-pull article gnus-newsgroup-bookmarks)
10941     (gnus-message 6 "Removed bookmark.")))
10942
10943 ;; Suggested by Daniel Quinlan <quinlan@best.com>.
10944 (defun gnus-summary-mark-as-dormant (n)
10945   "Mark N articles forward as dormant.
10946 If N is negative, mark backward instead.  The difference between N and
10947 the actual number of articles marked is returned."
10948   (interactive "p")
10949   (gnus-summary-mark-forward n gnus-dormant-mark))
10950
10951 (defun gnus-summary-set-process-mark (article)
10952   "Set the process mark on ARTICLE and update the summary line."
10953   (setq gnus-newsgroup-processable
10954         (cons article
10955               (delq article gnus-newsgroup-processable)))
10956   (when (gnus-summary-goto-subject article)
10957     (gnus-summary-show-thread)
10958     (gnus-summary-goto-subject article)
10959     (gnus-summary-update-secondary-mark article)))
10960
10961 (defun gnus-summary-remove-process-mark (&rest articles)
10962   "Remove the process mark from ARTICLES and update the summary line."
10963   (dolist (article articles)
10964     (setq gnus-newsgroup-processable (delq article gnus-newsgroup-processable))
10965     (when (gnus-summary-goto-subject article)
10966       (gnus-summary-show-thread)
10967       (gnus-summary-goto-subject article)
10968       (gnus-summary-update-secondary-mark article)))
10969   t)
10970
10971 (defun gnus-summary-set-saved-mark (article)
10972   "Set the process mark on ARTICLE and update the summary line."
10973   (push article gnus-newsgroup-saved)
10974   (when (gnus-summary-goto-subject article)
10975     (gnus-summary-update-secondary-mark article)))
10976
10977 (defun gnus-summary-mark-forward (n &optional mark no-expire)
10978   "Mark N articles as read forwards.
10979 If N is negative, mark backwards instead.  Mark with MARK, ?r by default.
10980 The difference between N and the actual number of articles marked is
10981 returned.
10982 If NO-EXPIRE, auto-expiry will be inhibited."
10983   (interactive "p")
10984   (gnus-summary-show-thread)
10985   (let ((backward (< n 0))
10986         (gnus-summary-goto-unread
10987          (and gnus-summary-goto-unread
10988               (not (eq gnus-summary-goto-unread 'never))
10989               (not (memq mark (list gnus-unread-mark gnus-spam-mark
10990                                     gnus-ticked-mark gnus-dormant-mark)))))
10991         (n (abs n))
10992         (mark (or mark gnus-del-mark)))
10993     (while (and (> n 0)
10994                 (gnus-summary-mark-article nil mark no-expire)
10995                 (zerop (gnus-summary-next-subject
10996                         (if backward -1 1)
10997                         (and gnus-summary-goto-unread
10998                              (not (eq gnus-summary-goto-unread 'never)))
10999                         t)))
11000       (setq n (1- n)))
11001     (when (/= 0 n)
11002       (gnus-message 7 "No more %sarticles" (if mark "" "unread ")))
11003     (gnus-summary-recenter)
11004     (gnus-summary-position-point)
11005     (gnus-set-mode-line 'summary)
11006     n))
11007
11008 (defun gnus-summary-mark-article-as-read (mark)
11009   "Mark the current article quickly as read with MARK."
11010   (let ((article (gnus-summary-article-number)))
11011     (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
11012     (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
11013     (setq gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked))
11014     (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
11015     (push (cons article mark) gnus-newsgroup-reads)
11016     ;; Possibly remove from cache, if that is used.
11017     (when gnus-use-cache
11018       (gnus-cache-enter-remove-article article))
11019     ;; Allow the backend to change the mark.
11020     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
11021     ;; Check for auto-expiry.
11022     (when (and gnus-newsgroup-auto-expire
11023                (memq mark gnus-auto-expirable-marks))
11024       (setq mark gnus-expirable-mark)
11025       ;; Let the backend know about the mark change.
11026       (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
11027       (push article gnus-newsgroup-expirable))
11028     ;; Set the mark in the buffer.
11029     (gnus-summary-update-mark mark 'unread)
11030     t))
11031
11032 (defun gnus-summary-mark-article-as-unread (mark)
11033   "Mark the current article quickly as unread with MARK."
11034   (let* ((article (gnus-summary-article-number))
11035          (old-mark (gnus-summary-article-mark article)))
11036     ;; Allow the backend to change the mark.
11037     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
11038     (if (eq mark old-mark)
11039         t
11040       (if (<= article 0)
11041           (progn
11042             (gnus-error 1 "Can't mark negative article numbers")
11043             nil)
11044         (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
11045         (setq gnus-newsgroup-spam-marked
11046               (delq article gnus-newsgroup-spam-marked))
11047         (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
11048         (setq gnus-newsgroup-expirable (delq article gnus-newsgroup-expirable))
11049         (setq gnus-newsgroup-reads (delq article gnus-newsgroup-reads))
11050         (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
11051         (cond ((= mark gnus-ticked-mark)
11052                (setq gnus-newsgroup-marked
11053                      (gnus-add-to-sorted-list gnus-newsgroup-marked
11054                                               article)))
11055               ((= mark gnus-spam-mark)
11056                (setq gnus-newsgroup-spam-marked
11057                      (gnus-add-to-sorted-list gnus-newsgroup-spam-marked
11058                                               article)))
11059               ((= mark gnus-dormant-mark)
11060                (setq gnus-newsgroup-dormant
11061                      (gnus-add-to-sorted-list gnus-newsgroup-dormant
11062                                               article)))
11063               (t
11064                (setq gnus-newsgroup-unreads
11065                      (gnus-add-to-sorted-list gnus-newsgroup-unreads
11066                                               article))))
11067         (gnus-alist-pull article gnus-newsgroup-reads)
11068
11069         ;; See whether the article is to be put in the cache.
11070         (and gnus-use-cache
11071              (vectorp (gnus-summary-article-header article))
11072              (save-excursion
11073                (gnus-cache-possibly-enter-article
11074                 gnus-newsgroup-name article
11075                 (= mark gnus-ticked-mark)
11076                 (= mark gnus-dormant-mark) (= mark gnus-unread-mark))))
11077
11078         ;; Fix the mark.
11079         (gnus-summary-update-mark mark 'unread)
11080         t))))
11081
11082 (defun gnus-summary-mark-article (&optional article mark no-expire)
11083   "Mark ARTICLE with MARK.  MARK can be any character.
11084 Four MARK strings are reserved: `? ' (unread), `?!' (ticked),
11085 `??' (dormant) and `?E' (expirable).
11086 If MARK is nil, then the default character `?r' is used.
11087 If ARTICLE is nil, then the article on the current line will be
11088 marked.
11089 If NO-EXPIRE, auto-expiry will be inhibited."
11090   ;; The mark might be a string.
11091   (when (stringp mark)
11092     (setq mark (aref mark 0)))
11093   ;; If no mark is given, then we check auto-expiring.
11094   (when (null mark)
11095     (setq mark gnus-del-mark))
11096   (when (and (not no-expire)
11097              gnus-newsgroup-auto-expire
11098              (memq mark gnus-auto-expirable-marks))
11099     (setq mark gnus-expirable-mark))
11100   (let ((article (or article (gnus-summary-article-number)))
11101         (old-mark (gnus-summary-article-mark article)))
11102     ;; Allow the backend to change the mark.
11103     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
11104     (if (eq mark old-mark)
11105         t
11106       (unless article
11107         (error "No article on current line"))
11108       (if (not (if (or (= mark gnus-unread-mark)
11109                        (= mark gnus-ticked-mark)
11110                        (= mark gnus-spam-mark)
11111                        (= mark gnus-dormant-mark))
11112                    (gnus-mark-article-as-unread article mark)
11113                  (gnus-mark-article-as-read article mark)))
11114           t
11115         ;; See whether the article is to be put in the cache.
11116         (and gnus-use-cache
11117              (not (= mark gnus-canceled-mark))
11118              (vectorp (gnus-summary-article-header article))
11119              (save-excursion
11120                (gnus-cache-possibly-enter-article
11121                 gnus-newsgroup-name article
11122                 (= mark gnus-ticked-mark)
11123                 (= mark gnus-dormant-mark) (= mark gnus-unread-mark))))
11124
11125         (when (gnus-summary-goto-subject article nil t)
11126           (let ((inhibit-read-only t))
11127             (gnus-summary-show-thread)
11128             ;; Fix the mark.
11129             (gnus-summary-update-mark mark 'unread)
11130             t))))))
11131
11132 (defun gnus-summary-update-secondary-mark (article)
11133   "Update the secondary (read, process, cache) mark."
11134   (gnus-summary-update-mark
11135    (cond ((memq article gnus-newsgroup-processable)
11136           gnus-process-mark)
11137          ((memq article gnus-newsgroup-cached)
11138           gnus-cached-mark)
11139          ((memq article gnus-newsgroup-replied)
11140           gnus-replied-mark)
11141          ((memq article gnus-newsgroup-forwarded)
11142           gnus-forwarded-mark)
11143          ((memq article gnus-newsgroup-saved)
11144           gnus-saved-mark)
11145          ((memq article gnus-newsgroup-unseen)
11146           gnus-unseen-mark)
11147          (t gnus-no-mark))
11148    'replied)
11149   (when (gnus-visual-p 'summary-highlight 'highlight)
11150     (gnus-summary-highlight-line)
11151     (gnus-run-hooks 'gnus-summary-update-hook))
11152   t)
11153
11154 (defun gnus-summary-update-download-mark (article)
11155   "Update the download mark."
11156   (gnus-summary-update-mark
11157    (cond ((memq article gnus-newsgroup-undownloaded)
11158           gnus-undownloaded-mark)
11159          (gnus-newsgroup-agentized
11160           gnus-downloaded-mark)
11161          (t
11162           gnus-no-mark))
11163    'download)
11164   (gnus-summary-update-line t)
11165   t)
11166
11167 (defun gnus-summary-update-mark (mark type)
11168   (let ((forward (cdr (assq type gnus-summary-mark-positions)))
11169         (inhibit-read-only t))
11170     (re-search-backward "[\n\r]" (point-at-bol) 'move-to-limit)
11171     (when forward
11172       (when (looking-at "\r")
11173         (incf forward))
11174       (when (<= (+ forward (point)) (point-max))
11175         ;; Go to the right position on the line.
11176         (goto-char (+ forward (point)))
11177         ;; Replace the old mark with the new mark.
11178         (let ((to-insert
11179                (mm-subst-char-in-string
11180                 (char-after) mark
11181                 (buffer-substring (point) (1+ (point))))))
11182           (delete-region (point) (1+ (point)))
11183           (insert to-insert))
11184         ;; Optionally update the marks by some user rule.
11185         (when (eq type 'unread)
11186           (gnus-data-set-mark
11187            (gnus-data-find (gnus-summary-article-number)) mark)
11188           (gnus-summary-update-line (eq mark gnus-unread-mark)))))))
11189
11190 (defun gnus-mark-article-as-read (article &optional mark)
11191   "Enter ARTICLE in the pertinent lists and remove it from others."
11192   ;; Make the article expirable.
11193   (let ((mark (or mark gnus-del-mark)))
11194     (setq gnus-newsgroup-expirable
11195           (if (= mark gnus-expirable-mark)
11196               (gnus-add-to-sorted-list gnus-newsgroup-expirable article)
11197             (delq article gnus-newsgroup-expirable)))
11198     ;; Remove from unread and marked lists.
11199     (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
11200     (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
11201     (setq gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked))
11202     (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
11203     (push (cons article mark) gnus-newsgroup-reads)
11204     ;; Possibly remove from cache, if that is used.
11205     (when gnus-use-cache
11206       (gnus-cache-enter-remove-article article))
11207     t))
11208
11209 (defun gnus-mark-article-as-unread (article &optional mark)
11210   "Enter ARTICLE in the pertinent lists and remove it from others."
11211   (let ((mark (or mark gnus-ticked-mark)))
11212     (if (<= article 0)
11213         (progn
11214           (gnus-error 1 "Can't mark negative article numbers")
11215           nil)
11216       (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked)
11217             gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked)
11218             gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant)
11219             gnus-newsgroup-expirable (delq article gnus-newsgroup-expirable)
11220             gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
11221
11222       ;; Unsuppress duplicates?
11223       (when gnus-suppress-duplicates
11224         (gnus-dup-unsuppress-article article))
11225
11226       (cond ((= mark gnus-ticked-mark)
11227              (setq gnus-newsgroup-marked
11228                    (gnus-add-to-sorted-list gnus-newsgroup-marked article)))
11229             ((= mark gnus-spam-mark)
11230              (setq gnus-newsgroup-spam-marked
11231                    (gnus-add-to-sorted-list gnus-newsgroup-spam-marked
11232                                             article)))
11233             ((= mark gnus-dormant-mark)
11234              (setq gnus-newsgroup-dormant
11235                    (gnus-add-to-sorted-list gnus-newsgroup-dormant article)))
11236             (t
11237              (setq gnus-newsgroup-unreads
11238                    (gnus-add-to-sorted-list gnus-newsgroup-unreads article))))
11239       (gnus-alist-pull article gnus-newsgroup-reads)
11240       t)))
11241
11242 (defun gnus-summary-tick-article-forward (n)
11243   "Tick N articles forwards.
11244 If N is negative, tick backwards instead.
11245 The difference between N and the number of articles ticked is returned."
11246   (interactive "p")
11247   (gnus-summary-mark-forward n gnus-ticked-mark))
11248
11249 (defun gnus-summary-tick-article-backward (n)
11250   "Tick N articles backwards.
11251 The difference between N and the number of articles ticked is returned."
11252   (interactive "p")
11253   (gnus-summary-mark-forward (- n) gnus-ticked-mark))
11254
11255 (defun gnus-summary-tick-article (&optional article clear-mark)
11256   "Mark current article as unread.
11257 Optional 1st argument ARTICLE specifies article number to be marked as unread.
11258 Optional 2nd argument CLEAR-MARK remove any kinds of mark."
11259   (interactive)
11260   (gnus-summary-mark-article article (if clear-mark gnus-unread-mark
11261                                        gnus-ticked-mark)))
11262
11263 (defun gnus-summary-mark-as-read-forward (n)
11264   "Mark N articles as read forwards.
11265 If N is negative, mark backwards instead.
11266 The difference between N and the actual number of articles marked is
11267 returned."
11268   (interactive "p")
11269   (gnus-summary-mark-forward n gnus-del-mark gnus-inhibit-user-auto-expire))
11270
11271 (defun gnus-summary-mark-as-read-backward (n)
11272   "Mark the N articles as read backwards.
11273 The difference between N and the actual number of articles marked is
11274 returned."
11275   (interactive "p")
11276   (gnus-summary-mark-forward
11277    (- n) gnus-del-mark gnus-inhibit-user-auto-expire))
11278
11279 (defun gnus-summary-mark-as-read (&optional article mark)
11280   "Mark current article as read.
11281 ARTICLE specifies the article to be marked as read.
11282 MARK specifies a string to be inserted at the beginning of the line."
11283   (gnus-summary-mark-article article mark))
11284
11285 (defun gnus-summary-clear-mark-forward (n)
11286   "Clear marks from N articles forward.
11287 If N is negative, clear backward instead.
11288 The difference between N and the number of marks cleared is returned."
11289   (interactive "p")
11290   (gnus-summary-mark-forward n gnus-unread-mark))
11291
11292 (defun gnus-summary-clear-mark-backward (n)
11293   "Clear marks from N articles backward.
11294 The difference between N and the number of marks cleared is returned."
11295   (interactive "p")
11296   (gnus-summary-mark-forward (- n) gnus-unread-mark))
11297
11298 (defun gnus-summary-mark-unread-as-read ()
11299   "Intended to be used by `gnus-mark-article-hook'."
11300   (when (memq gnus-current-article gnus-newsgroup-unreads)
11301     (gnus-summary-mark-article gnus-current-article gnus-read-mark)))
11302
11303 (defun gnus-summary-mark-read-and-unread-as-read (&optional new-mark)
11304   "Intended to be used by `gnus-mark-article-hook'."
11305   (let ((mark (gnus-summary-article-mark)))
11306     (when (or (gnus-unread-mark-p mark)
11307               (gnus-read-mark-p mark))
11308       (gnus-summary-mark-article gnus-current-article
11309                                  (or new-mark gnus-read-mark)))))
11310
11311 (defun gnus-summary-mark-current-read-and-unread-as-read (&optional new-mark)
11312   "Intended to be used by `gnus-mark-article-hook'."
11313   (let ((mark (gnus-summary-article-mark)))
11314     (when (or (gnus-unread-mark-p mark)
11315               (gnus-read-mark-p mark))
11316       (gnus-summary-mark-article (gnus-summary-article-number)
11317                                  (or new-mark gnus-read-mark)))))
11318
11319 (defun gnus-summary-mark-unread-as-ticked ()
11320   "Intended to be used by `gnus-mark-article-hook'."
11321   (when (memq gnus-current-article gnus-newsgroup-unreads)
11322     (gnus-summary-mark-article gnus-current-article gnus-ticked-mark)))
11323
11324 (defun gnus-summary-mark-region-as-read (point mark all)
11325   "Mark all unread articles between point and mark as read.
11326 If given a prefix, mark all articles between point and mark as read,
11327 even ticked and dormant ones."
11328   (interactive "r\nP")
11329   (save-excursion
11330     (let (article)
11331       (goto-char point)
11332       (beginning-of-line)
11333       (while (and
11334               (< (point) mark)
11335               (progn
11336                 (when (or all
11337                           (memq (setq article (gnus-summary-article-number))
11338                                 gnus-newsgroup-unreads))
11339                   (gnus-summary-mark-article article gnus-del-mark))
11340                 t)
11341               (gnus-summary-find-next))))))
11342
11343 (defun gnus-summary-mark-below (score mark)
11344   "Mark articles with score less than SCORE with MARK."
11345   (interactive "P\ncMark: ")
11346   (setq score (if score
11347                   (prefix-numeric-value score)
11348                 (or gnus-summary-default-score 0)))
11349   (with-current-buffer gnus-summary-buffer
11350     (goto-char (point-min))
11351     (while
11352         (progn
11353           (and (< (gnus-summary-article-score) score)
11354                (gnus-summary-mark-article nil mark))
11355           (gnus-summary-find-next)))))
11356
11357 (defun gnus-summary-kill-below (&optional score)
11358   "Mark articles with score below SCORE as read."
11359   (interactive "P")
11360   (gnus-summary-mark-below score gnus-killed-mark))
11361
11362 (defun gnus-summary-clear-above (&optional score)
11363   "Clear all marks from articles with score above SCORE."
11364   (interactive "P")
11365   (gnus-summary-mark-above score gnus-unread-mark))
11366
11367 (defun gnus-summary-tick-above (&optional score)
11368   "Tick all articles with score above SCORE."
11369   (interactive "P")
11370   (gnus-summary-mark-above score gnus-ticked-mark))
11371
11372 (defun gnus-summary-mark-above (score mark)
11373   "Mark articles with score over SCORE with MARK."
11374   (interactive "P\ncMark: ")
11375   (setq score (if score
11376                   (prefix-numeric-value score)
11377                 (or gnus-summary-default-score 0)))
11378   (with-current-buffer gnus-summary-buffer
11379     (goto-char (point-min))
11380     (while (and (progn
11381                   (when (> (gnus-summary-article-score) score)
11382                     (gnus-summary-mark-article nil mark))
11383                   t)
11384                 (gnus-summary-find-next)))))
11385
11386 ;; Suggested by Daniel Quinlan <quinlan@best.com>.
11387 (defalias 'gnus-summary-show-all-expunged 'gnus-summary-limit-include-expunged)
11388 (defun gnus-summary-limit-include-expunged (&optional no-error)
11389   "Display all the hidden articles that were expunged for low scores."
11390   (interactive)
11391   (let ((inhibit-read-only t))
11392     (let ((scored gnus-newsgroup-scored)
11393           headers h)
11394       (while scored
11395         (unless (gnus-summary-article-header (caar scored))
11396           (and (setq h (gnus-number-to-header (caar scored)))
11397                (< (cdar scored) gnus-summary-expunge-below)
11398                (push h headers)))
11399         (setq scored (cdr scored)))
11400       (if (not headers)
11401           (when (not no-error)
11402             (error "No expunged articles hidden"))
11403         (goto-char (point-min))
11404         (push gnus-newsgroup-limit gnus-newsgroup-limits)
11405         (setq gnus-newsgroup-limit (copy-sequence gnus-newsgroup-limit))
11406         (dolist (x headers)
11407           (push (mail-header-number x) gnus-newsgroup-limit))
11408         (gnus-summary-prepare-unthreaded (nreverse headers))
11409         (goto-char (point-min))
11410         (gnus-summary-position-point)
11411         t))))
11412
11413 (defun gnus-summary-catchup (&optional all quietly to-here not-mark reverse)
11414   "Mark all unread articles in this newsgroup as read.
11415 If prefix argument ALL is non-nil, ticked and dormant articles will
11416 also be marked as read.
11417 If QUIETLY is non-nil, no questions will be asked.
11418
11419 If TO-HERE is non-nil, it should be a point in the buffer.  All
11420 articles before (after, if REVERSE is set) this point will be marked
11421 as read.
11422
11423 Note that this function will only catch up the unread article
11424 in the current summary buffer limitation.
11425
11426 The number of articles marked as read is returned."
11427   (interactive "P")
11428   (prog1
11429       (save-excursion
11430         (when (or quietly
11431                   (not gnus-interactive-catchup) ;Without confirmation?
11432                   gnus-expert-user
11433                   (gnus-y-or-n-p
11434                    (if all
11435                        "Mark absolutely all articles as read? "
11436                      "Mark all unread articles as read? ")))
11437           (if (and not-mark
11438                    (not gnus-newsgroup-adaptive)
11439                    (not gnus-newsgroup-auto-expire)
11440                    (not gnus-suppress-duplicates)
11441                    (or (not gnus-use-cache)
11442                        (eq gnus-use-cache 'passive)))
11443               (progn
11444                 (when all
11445                   (setq gnus-newsgroup-marked nil
11446                         gnus-newsgroup-spam-marked nil
11447                         gnus-newsgroup-dormant nil))
11448                 (setq gnus-newsgroup-unreads
11449                       (gnus-sorted-nunion
11450                        (gnus-sorted-intersection gnus-newsgroup-unreads
11451                                                  gnus-newsgroup-downloadable)
11452                        (gnus-sorted-difference gnus-newsgroup-unfetched
11453                                                gnus-newsgroup-cached))))
11454             ;; We actually mark all articles as canceled, which we
11455             ;; have to do when using auto-expiry or adaptive scoring.
11456             (gnus-summary-show-all-threads)
11457             (if (and to-here reverse)
11458                 (progn
11459                   (goto-char to-here)
11460                   (gnus-summary-mark-current-read-and-unread-as-read
11461                    gnus-catchup-mark)
11462                   (while (gnus-summary-find-next (not all))
11463                     (gnus-summary-mark-article-as-read gnus-catchup-mark)))
11464               (when (gnus-summary-first-subject (not all))
11465                 (while (and
11466                         (if to-here (< (point) to-here) t)
11467                         (gnus-summary-mark-article-as-read gnus-catchup-mark)
11468                         (gnus-summary-find-next (not all))))))
11469             (gnus-set-mode-line 'summary))
11470           t))
11471     (gnus-summary-position-point)))
11472
11473 (defun gnus-summary-catchup-to-here (&optional all)
11474   "Mark all unticked articles before the current one as read.
11475 If ALL is non-nil, also mark ticked and dormant articles as read."
11476   (interactive "P")
11477   (save-excursion
11478     (gnus-save-hidden-threads
11479       (let ((beg (point)))
11480         ;; We check that there are unread articles.
11481         (when (or all (gnus-summary-find-prev))
11482           (gnus-summary-catchup all t beg)))))
11483   (gnus-summary-position-point))
11484
11485 (defun gnus-summary-catchup-from-here (&optional all)
11486   "Mark all unticked articles after (and including) the current one as read.
11487 If ALL is non-nil, also mark ticked and dormant articles as read."
11488   (interactive "P")
11489   (save-excursion
11490     (gnus-save-hidden-threads
11491       (let ((beg (point)))
11492         ;; We check that there are unread articles.
11493         (when (or all (gnus-summary-find-next))
11494           (gnus-summary-catchup all t beg nil t)))))
11495   (gnus-summary-position-point))
11496
11497 (defun gnus-summary-catchup-all (&optional quietly)
11498   "Mark all articles in this newsgroup as read.
11499 This command is dangerous.  Normally, you want \\[gnus-summary-catchup]
11500 instead, which marks only unread articles as read."
11501   (interactive "P")
11502   (gnus-summary-catchup t quietly))
11503
11504 (defun gnus-summary-catchup-and-exit (&optional all quietly)
11505   "Mark all unread articles in this group as read, then exit.
11506 If prefix argument ALL is non-nil, all articles are marked as read.
11507 If QUIETLY is non-nil, no questions will be asked."
11508   (interactive "P")
11509   (when (gnus-summary-catchup all quietly nil 'fast)
11510     ;; Select next newsgroup or exit.
11511     (if (and (not (gnus-group-quit-config gnus-newsgroup-name))
11512              (eq gnus-auto-select-next 'quietly))
11513         (gnus-summary-next-group nil)
11514       (gnus-summary-exit))))
11515
11516 (defun gnus-summary-catchup-all-and-exit (&optional quietly)
11517   "Mark all articles in this newsgroup as read, and then exit.
11518 This command is dangerous.  Normally, you want \\[gnus-summary-catchup-and-exit]
11519 instead, which marks only unread articles as read."
11520   (interactive "P")
11521   (gnus-summary-catchup-and-exit t quietly))
11522
11523 (defun gnus-summary-catchup-and-goto-next-group (&optional all)
11524   "Mark all articles in this group as read and select the next group.
11525 If given a prefix, mark all articles, unread as well as ticked, as
11526 read."
11527   (interactive "P")
11528   (save-excursion
11529     (gnus-summary-catchup all))
11530   (gnus-summary-next-group))
11531
11532 (defun gnus-summary-catchup-and-goto-prev-group (&optional all)
11533   "Mark all articles in this group as read and select the previous group.
11534 If given a prefix, mark all articles, unread as well as ticked, as
11535 read."
11536   (interactive "P")
11537   (save-excursion
11538     (gnus-summary-catchup all))
11539   (gnus-summary-next-group nil nil t))
11540
11541 ;;;
11542 ;;; with article
11543 ;;;
11544
11545 (defmacro gnus-with-article (article &rest forms)
11546   "Select ARTICLE and perform FORMS in the original article buffer.
11547 Then replace the article with the result."
11548   `(progn
11549      ;; We don't want the article to be marked as read.
11550      (let (gnus-mark-article-hook)
11551        (gnus-summary-select-article t t nil ,article))
11552      (set-buffer gnus-original-article-buffer)
11553      ,@forms
11554      (if (not (gnus-check-backend-function
11555                'request-replace-article (car gnus-article-current)))
11556          (gnus-message 5 "Read-only group; not replacing")
11557        (unless (gnus-request-replace-article
11558                 ,article (car gnus-article-current)
11559                 (current-buffer) t)
11560          (error "Couldn't replace article")))
11561      ;; The cache and backlog have to be flushed somewhat.
11562      (when gnus-keep-backlog
11563        (gnus-backlog-remove-article
11564         (car gnus-article-current) (cdr gnus-article-current)))
11565      (when gnus-use-cache
11566        (gnus-cache-update-article
11567         (car gnus-article-current) (cdr gnus-article-current)))))
11568
11569 (put 'gnus-with-article 'lisp-indent-function 1)
11570 (put 'gnus-with-article 'edebug-form-spec '(form body))
11571
11572 ;; Thread-based commands.
11573
11574 (defun gnus-summary-articles-in-thread (&optional article)
11575   "Return a list of all articles in the current thread.
11576 If ARTICLE is non-nil, return all articles in the thread that starts
11577 with that article."
11578   (let* ((article (or article (gnus-summary-article-number)))
11579          (data (gnus-data-find-list article))
11580          (top-level (gnus-data-level (car data)))
11581          (top-subject
11582           (cond ((null gnus-thread-operation-ignore-subject)
11583                  (gnus-simplify-subject-re
11584                   (mail-header-subject (gnus-data-header (car data)))))
11585                 ((eq gnus-thread-operation-ignore-subject 'fuzzy)
11586                  (gnus-simplify-subject-fuzzy
11587                   (mail-header-subject (gnus-data-header (car data)))))
11588                 (t nil)))
11589          (end-point (save-excursion
11590                       (goto-char (gnus-data-pos (car data)))
11591                       (if (gnus-summary-go-to-next-thread)
11592                           (point) (point-max))))
11593          articles)
11594     (while (and data
11595                 (< (gnus-data-pos (car data)) end-point))
11596       (when (or (not top-subject)
11597                 (string= top-subject
11598                          (if (eq gnus-thread-operation-ignore-subject 'fuzzy)
11599                              (gnus-simplify-subject-fuzzy
11600                               (mail-header-subject
11601                                (gnus-data-header (car data))))
11602                            (gnus-simplify-subject-re
11603                             (mail-header-subject
11604                              (gnus-data-header (car data)))))))
11605         (push (gnus-data-number (car data)) articles))
11606       (unless (and (setq data (cdr data))
11607                    (> (gnus-data-level (car data)) top-level))
11608         (setq data nil)))
11609     ;; Return the list of articles.
11610     (nreverse articles)))
11611
11612 (defun gnus-summary-rethread-current ()
11613   "Rethread the thread the current article is part of."
11614   (interactive)
11615   (let* ((gnus-show-threads t)
11616          (article (gnus-summary-article-number))
11617          (id (mail-header-id (gnus-summary-article-header)))
11618          (gnus-newsgroup-threads (list (gnus-id-to-thread (gnus-root-id id)))))
11619     (unless id
11620       (error "No article on the current line"))
11621     (gnus-rebuild-thread id)
11622     (gnus-summary-goto-subject article)))
11623
11624 (defun gnus-summary-reparent-thread ()
11625   "Make the current article child of the marked (or previous) article.
11626
11627 Note that the re-threading will only work if `gnus-thread-ignore-subject'
11628 is non-nil or the Subject: of both articles are the same."
11629   (interactive)
11630   (unless (not (gnus-group-read-only-p))
11631     (error "The current newsgroup does not support article editing"))
11632   (unless (<= (length gnus-newsgroup-processable) 1)
11633     (error "No more than one article may be marked"))
11634   (let ((child (gnus-summary-article-number))
11635         ;; First grab the marked article, otherwise one line up.
11636         (parent (if (not (null gnus-newsgroup-processable))
11637                     (car gnus-newsgroup-processable)
11638                   (save-excursion
11639                     (if (eq (forward-line -1) 0)
11640                         (gnus-summary-article-number)
11641                       (error "Beginning of summary buffer"))))))
11642     (gnus-summary-reparent-children parent (list child))))
11643
11644 (defun gnus-summary-reparent-children (parent children)
11645   "Make PARENT the parent of CHILDREN.
11646 When called interactively, PARENT is the current article and CHILDREN
11647 are the process-marked articles."
11648   (interactive
11649    (list (gnus-summary-article-number)
11650          (gnus-summary-work-articles nil)))
11651   (dolist (child children)
11652     (save-window-excursion
11653       (let ((gnus-article-buffer " *reparent*"))
11654         (unless (not (eq parent child))
11655           (error "An article may not be self-referential"))
11656         (let ((message-id (mail-header-id
11657                            (gnus-summary-article-header parent))))
11658           (unless (and message-id (not (equal message-id "")))
11659             (error "No message-id in desired parent"))
11660           (gnus-with-article child
11661             (save-restriction
11662               (goto-char (point-min))
11663               (message-narrow-to-head)
11664               (if (re-search-forward "^References: " nil t)
11665                   (progn
11666                     (re-search-forward "^[^ \t]" nil t)
11667                     (forward-line -1)
11668                     (end-of-line)
11669                     (insert " " message-id))
11670                 (insert "References: " message-id "\n"))))
11671           (set-buffer gnus-summary-buffer)
11672           (gnus-summary-unmark-all-processable)
11673           (gnus-summary-update-article child)
11674           (when (gnus-summary-goto-subject (cdr gnus-article-current) nil t)
11675             (gnus-summary-update-secondary-mark (cdr gnus-article-current)))
11676           (gnus-summary-rethread-current)
11677           (gnus-message 3 "Article %d is now the child of article %d"
11678                         child parent))))))
11679
11680 (defun gnus-summary-toggle-threads (&optional arg)
11681   "Toggle showing conversation threads.
11682 If ARG is positive number, turn showing conversation threads on."
11683   (interactive "P")
11684   (let ((current (or (gnus-summary-article-number) gnus-newsgroup-end)))
11685     (setq gnus-show-threads
11686           (if (null arg) (not gnus-show-threads)
11687             (> (prefix-numeric-value arg) 0)))
11688     (gnus-summary-prepare)
11689     (gnus-summary-goto-subject current)
11690     (gnus-message 6 "Threading is now %s" (if gnus-show-threads "on" "off"))
11691     (gnus-summary-position-point)))
11692
11693 (eval-and-compile
11694   (if (fboundp 'remove-overlays)
11695       (defalias 'gnus-remove-overlays 'remove-overlays)
11696     (defun gnus-remove-overlays (beg end name val)
11697       "Clear BEG and END of overlays whose property NAME has value VAL.
11698 For compatibility with XEmacs."
11699       (dolist (ov (gnus-overlays-in beg end))
11700         (when (eq (gnus-overlay-get ov name) val)
11701           (gnus-delete-overlay ov))))))
11702
11703 (defun gnus-summary-show-all-threads ()
11704   "Show all threads."
11705   (interactive)
11706   (gnus-remove-overlays (point-min) (point-max) 'invisible 'gnus-sum)
11707   (gnus-summary-position-point))
11708
11709 (defsubst gnus-summary--inv (p)
11710   (and (eq (get-char-property p 'invisible) 'gnus-sum) p))
11711
11712 (defun gnus-summary-show-thread ()
11713   "Show thread subtrees.
11714 Returns nil if no thread was there to be shown."
11715   (interactive)
11716   (let* ((orig (point))
11717          (end (point-at-eol))
11718          (end (or (gnus-summary--inv end) (gnus-summary--inv (1- end))))
11719          ;; Leave point at bol
11720          (beg (progn (beginning-of-line) (if (bobp) (point) (1- (point)))))
11721          (eoi (when end
11722                 (if (fboundp 'next-single-char-property-change)
11723                     ;; Note: XEmacs version of n-s-c-p-c may return nil
11724                     (or (next-single-char-property-change end 'invisible)
11725                         (point-max))
11726                   (while (progn
11727                            (end-of-line 2)
11728                            (and (not (eobp))
11729                                 (eq (get-char-property (point) 'invisible)
11730                                     'gnus-sum))))
11731                   (point)))))
11732     (when eoi
11733       (gnus-remove-overlays beg eoi 'invisible 'gnus-sum)
11734       (goto-char orig)
11735       (gnus-summary-position-point)
11736       eoi)))
11737
11738 (defun gnus-summary-maybe-hide-threads ()
11739   "If requested, hide the threads that should be hidden."
11740   (when (and gnus-show-threads
11741              gnus-thread-hide-subtree)
11742     (gnus-summary-hide-all-threads
11743      (if (or (consp gnus-thread-hide-subtree)
11744              (functionp gnus-thread-hide-subtree))
11745          (gnus-make-predicate gnus-thread-hide-subtree)
11746        nil))))
11747
11748 ;;; Hiding predicates.
11749
11750 (defun gnus-article-unread-p (header)
11751   (memq (mail-header-number header) gnus-newsgroup-unreads))
11752
11753 (defun gnus-article-unseen-p (header)
11754   (memq (mail-header-number header) gnus-newsgroup-unseen))
11755
11756 (defun gnus-map-articles (predicate articles)
11757   "Map PREDICATE over ARTICLES and return non-nil if any predicate is non-nil."
11758   (apply 'gnus-or (mapcar predicate
11759                           (mapcar (lambda (number)
11760                                     (gnus-summary-article-header number))
11761                                   articles))))
11762
11763 (defun gnus-summary-hide-all-threads (&optional predicate)
11764   "Hide all thread subtrees.
11765 If PREDICATE is supplied, threads that satisfy this predicate
11766 will not be hidden."
11767   (interactive)
11768   (save-excursion
11769     (goto-char (point-min))
11770     (let ((end nil)
11771           (count 0))
11772       (while (not end)
11773         (incf count)
11774         (when (zerop (mod count 1000))
11775           (message "Hiding all threads... %d" count))
11776         (when (or (not predicate)
11777                   (gnus-map-articles
11778                    predicate (gnus-summary-article-children)))
11779             (gnus-summary-hide-thread))
11780         (setq end (not (zerop (gnus-summary-next-thread 1 t)))))))
11781   (gnus-summary-position-point))
11782
11783 (defun gnus-summary-hide-thread ()
11784   "Hide thread subtrees.
11785 If PREDICATE is supplied, threads that satisfy this predicate
11786 will not be hidden.
11787 Returns nil if no threads were there to be hidden."
11788   (interactive)
11789   (beginning-of-line)
11790   (let ((start (point))
11791         (starteol (line-end-position))
11792         (article (gnus-summary-article-number)))
11793     ;; Go forward until either the buffer ends or the subthread ends.
11794     (when (and (not (eobp))
11795                (or (zerop (gnus-summary-next-thread 1 t))
11796                    (goto-char (point-max))))
11797       (if (and (> (point) start)
11798                ;; FIXME: this should actually search for a non-invisible \n.
11799                (search-backward "\n" start t))
11800           (progn
11801             (when (> (point) starteol)
11802               (gnus-remove-overlays starteol (point) 'invisible 'gnus-sum)
11803               (let ((ol (gnus-make-overlay starteol (point) nil t nil)))
11804                 (gnus-overlay-put ol 'invisible 'gnus-sum)
11805                 (gnus-overlay-put ol 'evaporate t)))
11806             (gnus-summary-goto-subject article)
11807             (when (> start (point))
11808               (message "Hiding the thread moved us backwards, aborting!")
11809               (goto-char (point-max))))
11810         (goto-char start)
11811         nil))))
11812
11813 (defun gnus-summary-go-to-next-thread (&optional previous)
11814   "Go to the same level (or less) next thread.
11815 If PREVIOUS is non-nil, go to previous thread instead.
11816 Return the article number moved to, or nil if moving was impossible."
11817   (let ((level (gnus-summary-thread-level))
11818         (way (if previous -1 1))
11819         (beg (point)))
11820     (forward-line way)
11821     (while (and (not (eobp))
11822                 (< level (gnus-summary-thread-level)))
11823       (forward-line way))
11824     (if (eobp)
11825         (progn
11826           (goto-char beg)
11827           nil)
11828       (setq beg (point))
11829       (prog1
11830           (gnus-summary-article-number)
11831         (goto-char beg)))))
11832
11833 (defun gnus-summary-next-thread (n &optional silent)
11834   "Go to the same level next N'th thread.
11835 If N is negative, search backward instead.
11836 Returns the difference between N and the number of skips actually
11837 done.
11838
11839 If SILENT, don't output messages."
11840   (interactive "p")
11841   (let ((backward (< n 0))
11842         (n (abs n)))
11843     (while (and (> n 0)
11844                 (gnus-summary-go-to-next-thread backward))
11845       (decf n))
11846     (unless silent
11847       (gnus-summary-position-point))
11848     (when (and (not silent) (/= 0 n))
11849       (gnus-message 7 "No more threads"))
11850     n))
11851
11852 (defun gnus-summary-prev-thread (n)
11853   "Go to the same level previous N'th thread.
11854 Returns the difference between N and the number of skips actually
11855 done."
11856   (interactive "p")
11857   (gnus-summary-next-thread (- n)))
11858
11859 (defun gnus-summary-go-down-thread ()
11860   "Go down one level in the current thread."
11861   (let ((children (gnus-summary-article-children)))
11862     (when children
11863       (gnus-summary-goto-subject (car children)))))
11864
11865 (defun gnus-summary-go-up-thread ()
11866   "Go up one level in the current thread."
11867   (let ((parent (gnus-summary-article-parent)))
11868     (when parent
11869       (gnus-summary-goto-subject parent))))
11870
11871 (defun gnus-summary-down-thread (n)
11872   "Go down thread N steps.
11873 If N is negative, go up instead.
11874 Returns the difference between N and how many steps down that were
11875 taken."
11876   (interactive "p")
11877   (let ((up (< n 0))
11878         (n (abs n)))
11879     (while (and (> n 0)
11880                 (if up (gnus-summary-go-up-thread)
11881                   (gnus-summary-go-down-thread)))
11882       (setq n (1- n)))
11883     (gnus-summary-position-point)
11884     (when (/= 0 n)
11885       (gnus-message 7 "Can't go further"))
11886     n))
11887
11888 (defun gnus-summary-up-thread (n)
11889   "Go up thread N steps.
11890 If N is negative, go down instead.
11891 Returns the difference between N and how many steps down that were
11892 taken."
11893   (interactive "p")
11894   (gnus-summary-down-thread (- n)))
11895
11896 (defun gnus-summary-top-thread ()
11897   "Go to the top of the thread."
11898   (interactive)
11899   (while (gnus-summary-go-up-thread))
11900   (gnus-summary-article-number))
11901
11902 (defun gnus-summary-expire-thread ()
11903   "Mark articles under current thread as expired."
11904   (interactive)
11905   (gnus-summary-kill-thread 0))
11906
11907 (defun gnus-summary-kill-thread (&optional unmark)
11908   "Mark articles under current thread as read.
11909 If the prefix argument is positive, remove any kinds of marks.
11910 If the prefix argument is zero, mark thread as expired.
11911 If the prefix argument is negative, tick articles instead."
11912   (interactive "P")
11913   (when unmark
11914     (setq unmark (prefix-numeric-value unmark)))
11915   (let ((articles (gnus-summary-articles-in-thread))
11916         (hide (or (null unmark) (= unmark 0))))
11917     (save-excursion
11918       ;; Expand the thread.
11919       (gnus-summary-show-thread)
11920       ;; Mark all the articles.
11921       (while articles
11922         (gnus-summary-goto-subject (car articles))
11923         (cond ((null unmark)
11924                (gnus-summary-mark-article-as-read gnus-killed-mark))
11925               ((> unmark 0)
11926                (gnus-summary-mark-article-as-unread gnus-unread-mark))
11927               ((= unmark 0)
11928                (gnus-summary-mark-article nil gnus-expirable-mark))
11929               (t
11930                (gnus-summary-mark-article-as-unread gnus-ticked-mark)))
11931         (setq articles (cdr articles))))
11932     ;; Hide killed subtrees when hide is true.
11933     (and hide
11934          gnus-thread-hide-killed
11935          (gnus-summary-hide-thread))
11936     ;; If hide is t, go to next unread subject.
11937     (when hide
11938       ;; Go to next unread subject.
11939       (gnus-summary-next-subject 1 t)))
11940   (gnus-set-mode-line 'summary))
11941
11942 ;; Summary sorting commands
11943
11944 (defun gnus-summary-sort-by-number (&optional reverse)
11945   "Sort the summary buffer by article number.
11946 Argument REVERSE means reverse order."
11947   (interactive "P")
11948   (gnus-summary-sort 'number reverse))
11949
11950 (defun gnus-summary-sort-by-most-recent-number (&optional reverse)
11951   "Sort the summary buffer by most recent article number.
11952 Argument REVERSE means reverse order."
11953   (interactive "P")
11954   (gnus-summary-sort 'most-recent-number reverse))
11955
11956 (defun gnus-summary-sort-by-random (&optional reverse)
11957   "Randomize the order in the summary buffer.
11958 Argument REVERSE means to randomize in reverse order."
11959   (interactive "P")
11960   (gnus-summary-sort 'random reverse))
11961
11962 (defun gnus-summary-sort-by-author (&optional reverse)
11963   "Sort the summary buffer by author name alphabetically.
11964 If `case-fold-search' is non-nil, case of letters is ignored.
11965 Argument REVERSE means reverse order."
11966   (interactive "P")
11967   (gnus-summary-sort 'author reverse))
11968
11969 (defun gnus-summary-sort-by-recipient (&optional reverse)
11970   "Sort the summary buffer by recipient name alphabetically.
11971 If `case-fold-search' is non-nil, case of letters is ignored.
11972 Argument REVERSE means reverse order."
11973   (interactive "P")
11974   (gnus-summary-sort 'recipient reverse))
11975
11976 (defun gnus-summary-sort-by-subject (&optional reverse)
11977   "Sort the summary buffer by subject alphabetically.  `Re:'s are ignored.
11978 If `case-fold-search' is non-nil, case of letters is ignored.
11979 Argument REVERSE means reverse order."
11980   (interactive "P")
11981   (gnus-summary-sort 'subject reverse))
11982
11983 (defun gnus-summary-sort-by-date (&optional reverse)
11984   "Sort the summary buffer by date.
11985 Argument REVERSE means reverse order."
11986   (interactive "P")
11987   (gnus-summary-sort 'date reverse))
11988
11989 (defun gnus-summary-sort-by-most-recent-date (&optional reverse)
11990   "Sort the summary buffer by most recent date.
11991 Argument REVERSE means reverse order."
11992   (interactive "P")
11993   (gnus-summary-sort 'most-recent-date reverse))
11994
11995 (defun gnus-summary-sort-by-score (&optional reverse)
11996   "Sort the summary buffer by score.
11997 Argument REVERSE means reverse order."
11998   (interactive "P")
11999   (gnus-summary-sort 'score reverse))
12000
12001 (defun gnus-summary-sort-by-lines (&optional reverse)
12002   "Sort the summary buffer by the number of lines.
12003 Argument REVERSE means reverse order."
12004   (interactive "P")
12005   (gnus-summary-sort 'lines reverse))
12006
12007 (defun gnus-summary-sort-by-chars (&optional reverse)
12008   "Sort the summary buffer by article length.
12009 Argument REVERSE means reverse order."
12010   (interactive "P")
12011   (gnus-summary-sort 'chars reverse))
12012
12013 (defun gnus-summary-sort-by-original (&optional reverse)
12014   "Sort the summary buffer using the default sorting method.
12015 Argument REVERSE means reverse order."
12016   (interactive "P")
12017   (let* ((inhibit-read-only t)
12018          (gnus-summary-prepare-hook nil))
12019     ;; We do the sorting by regenerating the threads.
12020     (gnus-summary-prepare)
12021     ;; Hide subthreads if needed.
12022     (gnus-summary-maybe-hide-threads)))
12023
12024 (defun gnus-summary-sort (predicate reverse)
12025   "Sort summary buffer by PREDICATE.  REVERSE means reverse order."
12026   (let* ((thread (intern (format "gnus-thread-sort-by-%s" predicate)))
12027          (article (intern (format "gnus-article-sort-by-%s" predicate)))
12028          (gnus-thread-sort-functions
12029           (if (not reverse)
12030               thread
12031             `(lambda (t1 t2)
12032                (,thread t2 t1))))
12033          (gnus-sort-gathered-threads-function
12034           gnus-thread-sort-functions)
12035          (gnus-article-sort-functions
12036           (if (not reverse)
12037               article
12038             `(lambda (t1 t2)
12039                (,article t2 t1))))
12040          (inhibit-read-only t)
12041          (gnus-summary-prepare-hook nil))
12042     ;; We do the sorting by regenerating the threads.
12043     (gnus-summary-prepare)
12044     ;; Hide subthreads if needed.
12045     (gnus-summary-maybe-hide-threads)))
12046
12047 ;; Summary saving commands.
12048
12049 (defun gnus-summary-save-article (&optional n not-saved)
12050   "Save the current article using the default saver function.
12051 If N is a positive number, save the N next articles.
12052 If N is a negative number, save the N previous articles.
12053 If N is nil and any articles have been marked with the process mark,
12054 save those articles instead.
12055 The variable `gnus-default-article-saver' specifies the saver function.
12056
12057 If the optional second argument NOT-SAVED is non-nil, articles saved
12058 will not be marked as saved."
12059   (interactive "P")
12060   (require 'gnus-art)
12061   (let* ((articles (gnus-summary-work-articles n))
12062          (save-buffer (save-excursion
12063                         (nnheader-set-temp-buffer " *Gnus Save*")))
12064          (num (length articles))
12065          ;; Whether to save decoded articles or raw articles.
12066          (decode (when gnus-article-save-coding-system
12067                    (get gnus-default-article-saver :decode)))
12068          ;; When saving many articles in a single file, use the other
12069          ;; function to save articles other than the first one.
12070          (saver2 (get gnus-default-article-saver :function))
12071          (gnus-prompt-before-saving (if saver2
12072                                         t
12073                                       gnus-prompt-before-saving))
12074          (gnus-default-article-saver gnus-default-article-saver)
12075          header file)
12076     (dolist (article articles)
12077       (setq header (gnus-summary-article-header article))
12078       (if (not (vectorp header))
12079           ;; This is a pseudo-article.
12080           (if (assq 'name header)
12081               (gnus-copy-file (cdr (assq 'name header)))
12082             (gnus-message 1 "Article %d is unsavable" article))
12083         ;; This is a real article.
12084         (save-window-excursion
12085           (gnus-summary-select-article decode decode nil article)
12086           (gnus-summary-goto-subject article))
12087         (with-current-buffer save-buffer
12088           (erase-buffer)
12089           (insert-buffer-substring (if decode
12090                                        gnus-article-buffer
12091                                      gnus-original-article-buffer)))
12092         (setq file (gnus-article-save save-buffer file num))
12093         (gnus-summary-remove-process-mark article)
12094         (unless not-saved
12095           (gnus-summary-set-saved-mark article)))
12096       (when saver2
12097         (setq gnus-default-article-saver saver2
12098               saver2 nil)))
12099     (gnus-kill-buffer save-buffer)
12100     (gnus-summary-position-point)
12101     (gnus-set-mode-line 'summary)
12102     n))
12103
12104 (declare-function gnus-summary-save-in-pipe "gnus-art" (&optional command raw))
12105
12106 (defun gnus-summary-pipe-output (&optional n sym)
12107   "Pipe the current article to a subprocess.
12108 If N is a positive number, pipe the N next articles.
12109 If N is a negative number, pipe the N previous articles.
12110 If N is nil and any articles have been marked with the process mark,
12111 pipe those articles instead.
12112 The default command to which articles are piped is specified by the
12113 variable `gnus-summary-pipe-output-default-command'; if it is nil, you
12114 will be prompted for the command.
12115
12116 The properties `:decode' and `:headers' that are put to the function
12117 symbol `gnus-summary-save-in-pipe' control whether this function
12118 decodes articles and what headers to keep (see the doc string for the
12119 `gnus-default-article-saver' variable).  If SYM (the symbolic prefix)
12120 is neither omitted nor the symbol `r', force including all headers
12121 regardless of the `:headers' property.  If it is the symbol `r',
12122 articles that are not decoded and include all headers will be piped
12123 no matter what the properties `:decode' and `:headers' are."
12124   (interactive (gnus-interactive "P\ny"))
12125   (require 'gnus-art)
12126   (let* ((articles (gnus-summary-work-articles n))
12127          (result-buffer "*Shell Command Output*")
12128          (all-headers (not (memq sym '(nil r))))
12129          (gnus-save-all-headers (or all-headers gnus-save-all-headers))
12130          (raw (eq sym 'r))
12131          (headers (get 'gnus-summary-save-in-pipe :headers))
12132          command result)
12133     (unless (numberp (car articles))
12134       (error "No article to pipe"))
12135     (setq command (gnus-read-shell-command
12136                    (concat "Shell command on "
12137                            (if (cdr articles)
12138                                (format "these %d articles" (length articles))
12139                              "this article")
12140                            ": ")
12141                    gnus-summary-pipe-output-default-command))
12142     (when (string-equal command "")
12143       (error "A command is required"))
12144     (when all-headers
12145       (put 'gnus-summary-save-in-pipe :headers nil))
12146     (unwind-protect
12147         (while articles
12148           (gnus-summary-goto-subject (pop articles))
12149           (save-window-excursion (gnus-summary-save-in-pipe command raw))
12150           (when (and (get-buffer result-buffer)
12151                      (not (zerop (buffer-size (get-buffer result-buffer)))))
12152             (setq result (concat result (with-current-buffer result-buffer
12153                                           (buffer-string))))))
12154       (put 'gnus-summary-save-in-pipe :headers headers))
12155     (unless (zerop (length result))
12156       (if (with-current-buffer (get-buffer-create result-buffer)
12157             (erase-buffer)
12158             (insert result)
12159             (prog1
12160                 (and (= (count-lines (point-min) (point)) 1)
12161                      (progn
12162                        (end-of-line 0)
12163                        (<= (current-column)
12164                            (window-width (minibuffer-window)))))
12165               (goto-char (point-min))))
12166           (message "%s" (substring result 0 -1))
12167         (message nil)
12168         (gnus-configure-windows 'pipe)))))
12169
12170 (defun gnus-summary-save-article-mail (&optional arg)
12171   "Append the current article to a Unix mail box file.
12172 If N is a positive number, save the N next articles.
12173 If N is a negative number, save the N previous articles.
12174 If N is nil and any articles have been marked with the process mark,
12175 save those articles instead."
12176   (interactive "P")
12177   (require 'gnus-art)
12178   (let ((gnus-default-article-saver 'gnus-summary-save-in-mail))
12179     (gnus-summary-save-article arg)))
12180
12181 (defun gnus-summary-save-article-rmail (&optional arg)
12182   "Append the current article to an rmail file.
12183 If N is a positive number, save the N next articles.
12184 If N is a negative number, save the N previous articles.
12185 If N is nil and any articles have been marked with the process mark,
12186 save those articles instead."
12187   (interactive "P")
12188   (require 'gnus-art)
12189   (let ((gnus-default-article-saver 'gnus-summary-save-in-rmail))
12190     (gnus-summary-save-article arg)))
12191
12192 (defun gnus-summary-save-article-file (&optional arg)
12193   "Append the current article to a file.
12194 If N is a positive number, save the N next articles.
12195 If N is a negative number, save the N previous articles.
12196 If N is nil and any articles have been marked with the process mark,
12197 save those articles instead."
12198   (interactive "P")
12199   (require 'gnus-art)
12200   (let ((gnus-default-article-saver 'gnus-summary-save-in-file))
12201     (gnus-summary-save-article arg)))
12202
12203 (defun gnus-summary-write-article-file (&optional arg)
12204   "Write the current article to a file, deleting the previous file.
12205 If N is a positive number, save the N next articles.
12206 If N is a negative number, save the N previous articles.
12207 If N is nil and any articles have been marked with the process mark,
12208 save those articles instead."
12209   (interactive "P")
12210   (require 'gnus-art)
12211   (let ((gnus-default-article-saver 'gnus-summary-write-to-file))
12212     (gnus-summary-save-article arg)))
12213
12214 (defun gnus-summary-save-article-body-file (&optional arg)
12215   "Append the current article body to a file.
12216 If N is a positive number, save the N next articles.
12217 If N is a negative number, save the N previous articles.
12218 If N is nil and any articles have been marked with the process mark,
12219 save those articles instead."
12220   (interactive "P")
12221   (require 'gnus-art)
12222   (let ((gnus-default-article-saver 'gnus-summary-save-body-in-file))
12223     (gnus-summary-save-article arg)))
12224
12225 (defun gnus-summary-write-article-body-file (&optional arg)
12226   "Write the current article body to a file, deleting the previous file.
12227 If N is a positive number, save the N next articles.
12228 If N is a negative number, save the N previous articles.
12229 If N is nil and any articles have been marked with the process mark,
12230 save those articles instead."
12231   (interactive "P")
12232   (require 'gnus-art)
12233   (let ((gnus-default-article-saver 'gnus-summary-write-body-to-file))
12234     (gnus-summary-save-article arg)))
12235
12236 (defun gnus-summary-muttprint (&optional arg)
12237   "Print the current article using Muttprint.
12238 If N is a positive number, save the N next articles.
12239 If N is a negative number, save the N previous articles.
12240 If N is nil and any articles have been marked with the process mark,
12241 save those articles instead."
12242   (interactive "P")
12243   (require 'gnus-art)
12244   (let ((gnus-default-article-saver 'gnus-summary-pipe-to-muttprint))
12245     (gnus-summary-save-article arg t)))
12246
12247 (defun gnus-summary-pipe-message (program)
12248   "Pipe the current article through PROGRAM."
12249   (interactive "sProgram: ")
12250   (gnus-summary-select-article)
12251   (let ((mail-header-separator ""))
12252     (gnus-eval-in-buffer-window gnus-article-buffer
12253       (save-restriction
12254         (widen)
12255         (let ((start (window-start))
12256               (inhibit-read-only t))
12257           (message-pipe-buffer-body program)
12258           (set-window-start (get-buffer-window (current-buffer)) start))))))
12259
12260 (defun gnus-get-split-value (methods)
12261   "Return a value based on the split METHODS."
12262   (let (split-name method result match)
12263     (when methods
12264       (with-current-buffer gnus-original-article-buffer
12265         (save-restriction
12266           (nnheader-narrow-to-headers)
12267           (while (and methods (not split-name))
12268             (goto-char (point-min))
12269             (setq method (pop methods))
12270             (setq match (car method))
12271             (when (cond
12272                    ((stringp match)
12273                     ;; Regular expression.
12274                     (ignore-errors
12275                       (re-search-forward match nil t)))
12276                    ((functionp match)
12277                     ;; Function.
12278                     (save-restriction
12279                       (widen)
12280                       (setq result (funcall match gnus-newsgroup-name))))
12281                    ((consp match)
12282                     ;; Form.
12283                     (save-restriction
12284                       (widen)
12285                       (setq result (eval match)))))
12286               (setq split-name (cdr method))
12287               (cond ((stringp result)
12288                      (push (expand-file-name
12289                             result gnus-article-save-directory)
12290                            split-name))
12291                     ((consp result)
12292                      (setq split-name (append result split-name)))))))))
12293     (nreverse split-name)))
12294
12295 (defun gnus-valid-move-group-p (group)
12296   (and (symbolp group)
12297        (boundp group)
12298        (symbol-name group)
12299        (symbol-value group)
12300        (gnus-get-function (gnus-find-method-for-group
12301                            (symbol-name group)) 'request-accept-article t)))
12302
12303 (defun gnus-read-move-group-name (prompt default articles prefix)
12304   "Read a group name."
12305   (let* ((split-name (gnus-get-split-value gnus-move-split-methods))
12306          (minibuffer-confirm-incomplete nil) ; XEmacs
12307          (prom
12308           (format "%s %s to"
12309                   prompt
12310                   (if (> (length articles) 1)
12311                       (format "these %d articles" (length articles))
12312                     "this article")))
12313          (to-newsgroup
12314           (cond
12315            ((null split-name)
12316             (gnus-group-completing-read
12317              prom
12318              (gnus-remove-if-not 'gnus-valid-move-group-p gnus-active-hashtb t)
12319              nil prefix nil default))
12320            ((= 1 (length split-name))
12321             (gnus-group-completing-read
12322              prom
12323              (gnus-remove-if-not 'gnus-valid-move-group-p gnus-active-hashtb t)
12324              nil prefix 'gnus-group-history (car split-name)))
12325            (t
12326             (gnus-completing-read
12327              prom (nreverse split-name) nil nil 'gnus-group-history))))
12328          (to-method (gnus-server-to-method (gnus-group-method to-newsgroup)))
12329          encoded)
12330     (when to-newsgroup
12331       (if (or (string= to-newsgroup "")
12332               (string= to-newsgroup prefix))
12333           (setq to-newsgroup default))
12334       (unless to-newsgroup
12335         (error "No group name entered"))
12336       (setq encoded (mm-encode-coding-string
12337                      to-newsgroup
12338                      (gnus-group-name-charset to-method to-newsgroup)))
12339       (or (gnus-active encoded)
12340           (gnus-activate-group encoded nil nil to-method)
12341           (if (gnus-y-or-n-p (format "No such group: %s.  Create it? "
12342                                      to-newsgroup))
12343               (or (and (gnus-request-create-group encoded to-method)
12344                        (gnus-activate-group encoded nil nil to-method)
12345                        (gnus-subscribe-group encoded))
12346                   (error "Couldn't create group %s" to-newsgroup)))
12347           (error "No such group: %s" to-newsgroup))
12348       encoded)))
12349
12350 (defvar gnus-summary-save-parts-counter)
12351 (declare-function mm-uu-dissect "mm-uu" (&optional noheader mime-type))
12352
12353 (defun gnus-summary-save-parts (type dir n &optional reverse)
12354   "Save parts matching TYPE to DIR.
12355 If REVERSE, save parts that do not match TYPE."
12356   (interactive
12357    (list (read-string "Save parts of type: "
12358                       (or (car gnus-summary-save-parts-type-history)
12359                           gnus-summary-save-parts-default-mime)
12360                       'gnus-summary-save-parts-type-history)
12361          (setq gnus-summary-save-parts-last-directory
12362                (read-directory-name "Save to directory: "
12363                                     gnus-summary-save-parts-last-directory
12364                                     nil t))
12365          current-prefix-arg))
12366   (gnus-summary-iterate n
12367     (let ((gnus-display-mime-function nil)
12368           gnus-article-prepare-hook
12369           gnus-article-decode-hook
12370           gnus-display-mime-function
12371           gnus-break-pages
12372           (gnus-inhibit-treatment t))
12373       (gnus-summary-select-article))
12374     (with-current-buffer gnus-article-buffer
12375       (let ((handles (or gnus-article-mime-handles
12376                          (mm-dissect-buffer nil gnus-article-loose-mime)
12377                          (and gnus-article-emulate-mime
12378                               (mm-uu-dissect))))
12379             (gnus-summary-save-parts-counter 1))
12380         (when handles
12381           (gnus-summary-save-parts-1 type dir handles reverse)
12382           (unless gnus-article-mime-handles ;; Don't destroy this case.
12383             (mm-destroy-parts handles)))))))
12384
12385 (defun gnus-summary-save-parts-1 (type dir handle reverse)
12386   (if (stringp (car handle))
12387       (mapcar (lambda (h) (gnus-summary-save-parts-1 type dir h reverse))
12388               (cdr handle))
12389     (when (if reverse
12390               (not (string-match type (mm-handle-media-type handle)))
12391             (string-match type (mm-handle-media-type handle)))
12392       (let ((file (expand-file-name
12393                    (gnus-map-function
12394                     mm-file-name-rewrite-functions
12395                     (file-name-nondirectory
12396                      (or
12397                       (mm-handle-filename handle)
12398                       (format "%s.%d.%d" gnus-newsgroup-name
12399                               (cdr gnus-article-current)
12400                               gnus-summary-save-parts-counter))))
12401                    dir)))
12402         (incf gnus-summary-save-parts-counter)
12403         (unless (file-exists-p file)
12404           (mm-save-part-to-file handle file))))))
12405
12406 ;; Summary extract commands
12407
12408 (defun gnus-summary-insert-pseudos (pslist &optional not-view)
12409   (let ((inhibit-read-only t)
12410         (article (gnus-summary-article-number))
12411         after-article b e)
12412     (unless (gnus-summary-goto-subject article)
12413       (error "No such article: %d" article))
12414     (gnus-summary-position-point)
12415     ;; If all commands are to be bunched up on one line, we collect
12416     ;; them here.
12417     (unless gnus-view-pseudos-separately
12418       (let ((ps (setq pslist (sort pslist 'gnus-pseudos<)))
12419             files action)
12420         (while ps
12421           (setq action (cdr (assq 'action (car ps))))
12422           (setq files (list (cdr (assq 'name (car ps)))))
12423           (while (and ps (cdr ps)
12424                       (string= (or action "1")
12425                                (or (cdr (assq 'action (cadr ps))) "2")))
12426             (push (cdr (assq 'name (cadr ps))) files)
12427             (setcdr ps (cddr ps)))
12428           (when files
12429             (when (not (string-match "%s" action))
12430               (push " " files))
12431             (push " " files)
12432             (when (assq 'execute (car ps))
12433               (setcdr (assq 'execute (car ps))
12434                       (funcall (if (string-match "%s" action)
12435                                    'format 'concat)
12436                                action
12437                                (mapconcat
12438                                 (lambda (f)
12439                                   (if (equal f " ")
12440                                       f
12441                                     (shell-quote-argument f)))
12442                                 files " ")))))
12443           (setq ps (cdr ps)))))
12444     (if (and gnus-view-pseudos (not not-view))
12445         (while pslist
12446           (when (assq 'execute (car pslist))
12447             (gnus-execute-command (cdr (assq 'execute (car pslist)))
12448                                   (eq gnus-view-pseudos 'not-confirm)))
12449           (setq pslist (cdr pslist)))
12450       (save-excursion
12451         (while pslist
12452           (setq after-article (or (cdr (assq 'article (car pslist)))
12453                                   (gnus-summary-article-number)))
12454           (gnus-summary-goto-subject after-article)
12455           (forward-line 1)
12456           (setq b (point))
12457           (insert "    " (file-name-nondirectory
12458                           (cdr (assq 'name (car pslist))))
12459                   ": " (or (cdr (assq 'execute (car pslist))) "") "\n")
12460           (setq e (point))
12461           (forward-line -1)             ; back to `b'
12462           (gnus-add-text-properties
12463            b (1- e) (list 'gnus-number gnus-reffed-article-number
12464                           gnus-mouse-face-prop gnus-mouse-face))
12465           (gnus-data-enter
12466            after-article gnus-reffed-article-number
12467            gnus-unread-mark b (car pslist) 0 (- e b))
12468           (setq gnus-newsgroup-unreads
12469                 (gnus-add-to-sorted-list gnus-newsgroup-unreads
12470                                          gnus-reffed-article-number))
12471           (setq gnus-reffed-article-number (1- gnus-reffed-article-number))
12472           (setq pslist (cdr pslist)))))))
12473
12474 (defun gnus-pseudos< (p1 p2)
12475   (let ((c1 (cdr (assq 'action p1)))
12476         (c2 (cdr (assq 'action p2))))
12477     (and c1 c2 (string< c1 c2))))
12478
12479 (defun gnus-request-pseudo-article (props)
12480   (cond ((assq 'execute props)
12481          (gnus-execute-command (cdr (assq 'execute props)))))
12482   (let ((gnus-current-article (gnus-summary-article-number)))
12483     (gnus-run-hooks 'gnus-mark-article-hook)))
12484
12485 (defun gnus-execute-command (command &optional automatic)
12486   (save-excursion
12487     (gnus-article-setup-buffer)
12488     (set-buffer gnus-article-buffer)
12489     (setq buffer-read-only nil)
12490     (let ((command (if automatic command
12491                      (read-string "Command: " (cons command 0)))))
12492       (erase-buffer)
12493       (insert "$ " command "\n\n")
12494       (if gnus-view-pseudo-asynchronously
12495           (start-process "gnus-execute" (current-buffer) shell-file-name
12496                          shell-command-switch command)
12497         (call-process shell-file-name nil t nil
12498                       shell-command-switch command)))))
12499
12500 ;; Summary kill commands.
12501
12502 (defun gnus-summary-edit-global-kill (article)
12503   "Edit the \"global\" kill file."
12504   (interactive (list (gnus-summary-article-number)))
12505   (gnus-group-edit-global-kill article))
12506
12507 (defun gnus-summary-edit-local-kill ()
12508   "Edit a local kill file applied to the current newsgroup."
12509   (interactive)
12510   (setq gnus-current-headers (gnus-summary-article-header))
12511   (gnus-group-edit-local-kill
12512    (gnus-summary-article-number) gnus-newsgroup-name))
12513
12514 ;;; Header reading.
12515
12516 (defun gnus-read-header (id &optional header)
12517   "Read the headers of article ID and enter them into the Gnus system."
12518   (let ((group gnus-newsgroup-name)
12519         (gnus-override-method
12520          (or
12521           gnus-override-method
12522           (and (gnus-news-group-p gnus-newsgroup-name)
12523                (car (gnus-refer-article-methods)))))
12524         where)
12525     ;; First we check to see whether the header in question is already
12526     ;; fetched.
12527     (if (stringp id)
12528         ;; This is a Message-ID.
12529         (setq header (or header (gnus-id-to-header id)))
12530       ;; This is an article number.
12531       (setq header (or header (gnus-summary-article-header id))))
12532     (if (and header
12533              (not (gnus-summary-article-sparse-p (mail-header-number header))))
12534         ;; We have found the header.
12535         header
12536       ;; We have to really fetch the header to this article.
12537       (with-current-buffer nntp-server-buffer
12538         (when (setq where (gnus-request-head id group))
12539           (nnheader-fold-continuation-lines)
12540           (goto-char (point-max))
12541           (insert ".\n")
12542           (goto-char (point-min))
12543           (insert "211 ")
12544           (princ (cond
12545                   ((numberp id) id)
12546                   ((cdr where) (cdr where))
12547                   (header (mail-header-number header))
12548                   (t gnus-reffed-article-number))
12549                  (current-buffer))
12550           (insert " Article retrieved.\n"))
12551         (if (or (not where)
12552                 (not (setq header (car (gnus-get-newsgroup-headers nil t)))))
12553             ()                          ; Malformed head.
12554           (unless (gnus-summary-article-sparse-p (mail-header-number header))
12555             (when (and (bound-and-true-p gnus-registry-enabled)
12556                        (not (gnus-ephemeral-group-p (car where))))
12557               (gnus-registry-handle-action
12558                (mail-header-id header) nil
12559                (gnus-group-prefixed-name
12560                 (car where)
12561                 (or gnus-override-method (gnus-find-method-for-group group)))
12562                (mail-header-subject header)
12563                (mail-header-from header)))
12564             (when (and (stringp id)
12565                        (or
12566                         (not (string= (gnus-group-real-name group)
12567                                       (car where)))
12568                         (not (gnus-server-equal gnus-override-method
12569                                                 (gnus-group-method group)))))
12570               ;; If we fetched by Message-ID and the article came from
12571               ;; a different group (or server), we fudge some bogus
12572               ;; article numbers for this article.
12573               (mail-header-set-number header gnus-reffed-article-number))
12574             (with-current-buffer gnus-summary-buffer
12575               (decf gnus-reffed-article-number)
12576               (gnus-remove-header (mail-header-number header))
12577               (push header gnus-newsgroup-headers)
12578               (setq gnus-current-headers header)
12579               (push (mail-header-number header) gnus-newsgroup-limit)))
12580           header)))))
12581
12582 (defun gnus-remove-header (number)
12583   "Remove header NUMBER from `gnus-newsgroup-headers'."
12584   (if (and gnus-newsgroup-headers
12585            (= number (mail-header-number (car gnus-newsgroup-headers))))
12586       (pop gnus-newsgroup-headers)
12587     (let ((headers gnus-newsgroup-headers))
12588       (while (and (cdr headers)
12589                   (not (= number (mail-header-number (cadr headers)))))
12590         (pop headers))
12591       (when (cdr headers)
12592         (setcdr headers (cddr headers))))))
12593
12594 ;;;
12595 ;;; summary highlights
12596 ;;;
12597
12598 (defun gnus-highlight-selected-summary ()
12599   "Highlight selected article in summary buffer."
12600   ;; Added by Per Abrahamsen <amanda@iesd.auc.dk>.
12601   (when gnus-summary-selected-face
12602     (save-excursion
12603       (let* ((beg (point-at-bol))
12604              (end (point-at-eol))
12605              ;; Fix by Mike Dugan <dugan@bucrf16.bu.edu>.
12606              (from (if (get-text-property beg gnus-mouse-face-prop)
12607                        beg
12608                      (or (next-single-property-change
12609                           beg gnus-mouse-face-prop nil end)
12610                          beg)))
12611              (to
12612               (if (= from end)
12613                   (- from 2)
12614                 (or (next-single-property-change
12615                      from gnus-mouse-face-prop nil end)
12616                     end))))
12617         ;; If no mouse-face prop on line we will have to = from = end,
12618         ;; so we highlight the entire line instead.
12619         (when (= (+ to 2) from)
12620           (setq from beg)
12621           (setq to end))
12622         (if gnus-newsgroup-selected-overlay
12623             ;; Move old overlay.
12624             (gnus-move-overlay
12625              gnus-newsgroup-selected-overlay from to (current-buffer))
12626           ;; Create new overlay.
12627           (gnus-overlay-put
12628            (setq gnus-newsgroup-selected-overlay (gnus-make-overlay from to))
12629            'face gnus-summary-selected-face))))))
12630
12631 (defvar gnus-summary-highlight-line-cached nil)
12632 (defvar gnus-summary-highlight-line-trigger nil)
12633
12634 (defun gnus-summary-highlight-line-0 ()
12635   (if (and (eq gnus-summary-highlight-line-trigger
12636                gnus-summary-highlight)
12637            gnus-summary-highlight-line-cached)
12638       gnus-summary-highlight-line-cached
12639     (setq gnus-summary-highlight-line-trigger gnus-summary-highlight
12640           gnus-summary-highlight-line-cached
12641           (let* ((cond (list 'cond))
12642                  (c cond)
12643                  (list gnus-summary-highlight))
12644             (while list
12645               (setcdr c (cons (list (caar list) (list 'quote (cdar list)))
12646                               nil))
12647               (setq c (cdr c)
12648                     list (cdr list)))
12649             (gnus-byte-compile (list 'lambda nil cond))))))
12650
12651 (defun gnus-summary-highlight-line ()
12652   "Highlight current line according to `gnus-summary-highlight'."
12653   (let* ((beg (point-at-bol))
12654          (article (or (gnus-summary-article-number) gnus-current-article))
12655          (score (or (cdr (assq article
12656                                gnus-newsgroup-scored))
12657                     gnus-summary-default-score 0))
12658          (mark (or (gnus-summary-article-mark) gnus-unread-mark))
12659          (inhibit-read-only t)
12660          (default gnus-summary-default-score)
12661          (default-high gnus-summary-default-high-score)
12662          (default-low gnus-summary-default-low-score)
12663          (uncached (and gnus-summary-use-undownloaded-faces
12664                         (memq article gnus-newsgroup-undownloaded)
12665                         (not (memq article gnus-newsgroup-cached)))))
12666     (let ((face (funcall (gnus-summary-highlight-line-0))))
12667       (unless (eq face (gnus-get-text-property-excluding-characters-with-faces beg 'face))
12668         (gnus-put-text-property-excluding-characters-with-faces
12669          beg (point-at-eol) 'face
12670          (setq face (if (boundp face) (symbol-value face) face)))
12671         (when gnus-summary-highlight-line-function
12672           (funcall gnus-summary-highlight-line-function article face))))))
12673
12674 (defun gnus-update-read-articles (group unread &optional compute)
12675   "Update the list of read articles in GROUP.
12676 UNREAD is a sorted list."
12677   (let ((active (or gnus-newsgroup-active (gnus-active group)))
12678         (info (gnus-get-info group))
12679         (prev 1)
12680         read)
12681     (if (or (not info) (not active))
12682         ;; There is no info on this group if it was, in fact,
12683         ;; killed.  Gnus stores no information on killed groups, so
12684         ;; there's nothing to be done.
12685         ;; One could store the information somewhere temporarily,
12686         ;; perhaps...  Hmmm...
12687         ()
12688       ;; Remove any negative articles numbers.
12689       (while (and unread (< (car unread) 0))
12690         (setq unread (cdr unread)))
12691       ;; Remove any expired article numbers
12692       (while (and unread (< (car unread) (car active)))
12693         (setq unread (cdr unread)))
12694       ;; Compute the ranges of read articles by looking at the list of
12695       ;; unread articles.
12696       (while unread
12697         (when (/= (car unread) prev)
12698           (push (if (= prev (1- (car unread))) prev
12699                   (cons prev (1- (car unread))))
12700                 read))
12701         (setq prev (1+ (car unread)))
12702         (setq unread (cdr unread)))
12703       (when (<= prev (cdr active))
12704         (push (cons prev (cdr active)) read))
12705       (setq read (if (> (length read) 1) (nreverse read) read))
12706       (if compute
12707           read
12708         (save-excursion
12709           (let (setmarkundo)
12710             ;; Propagate the read marks to the backend.
12711             (when (and (gnus-method-option-p
12712                         (gnus-find-method-for-group group)
12713                         'server-marks)
12714                        (gnus-check-backend-function 'request-set-mark group))
12715               (let ((del (gnus-remove-from-range (gnus-info-read info) read))
12716                     (add (gnus-remove-from-range read (gnus-info-read info))))
12717                 (when (or add del)
12718                   (unless (gnus-check-group group)
12719                     (error "Can't open server for %s" group))
12720                   (gnus-request-set-mark
12721                    group (delq nil (list (if add (list add 'add '(read)))
12722                                          (if del (list del 'del '(read))))))
12723                   (setq setmarkundo
12724                         `(gnus-request-set-mark
12725                           ,group
12726                           ',(delq nil (list
12727                                        (if del (list del 'add '(read)))
12728                                        (if add (list add 'del '(read))))))))))
12729             (set-buffer gnus-group-buffer)
12730             (gnus-undo-register
12731               `(progn
12732                  (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
12733                  (gnus-info-set-read ',info ',(gnus-info-read info))
12734                  (gnus-get-unread-articles-in-group ',info
12735                                                     (gnus-active ,group))
12736                  (gnus-group-update-group ,group t)
12737                  ,setmarkundo))))
12738         ;; Enter this list into the group info.
12739         (gnus-info-set-read info read)
12740         ;; Set the number of unread articles in gnus-newsrc-hashtb.
12741         (gnus-get-unread-articles-in-group info (gnus-active group))
12742         t))))
12743
12744 (defun gnus-offer-save-summaries ()
12745   "Offer to save all active summary buffers."
12746   (let (buffers)
12747     ;; Go through all buffers and find all summaries.
12748     (dolist (buffer (buffer-list))
12749       (when (and (setq buffer (buffer-name buffer))
12750                  (string-match "Summary" buffer)
12751                  (with-current-buffer buffer
12752                    ;; We check that this is, indeed, a summary buffer.
12753                    (and (derived-mode-p 'gnus-summary-mode)
12754                         ;; Also make sure this isn't bogus.
12755                         gnus-newsgroup-prepared
12756                         ;; Also make sure that this isn't a
12757                         ;; dead summary buffer.
12758                         (not gnus-dead-summary-mode))))
12759         (push buffer buffers)))
12760     ;; Go through all these summary buffers and offer to save them.
12761     (when buffers
12762       (save-excursion
12763         (if (eq gnus-interactive-exit 'quiet)
12764             (dolist (buffer buffers)
12765               (switch-to-buffer buffer)
12766               (gnus-summary-exit))
12767           (map-y-or-n-p
12768            "Update summary buffer %s? "
12769            (lambda (buf)
12770              (switch-to-buffer buf)
12771              (gnus-summary-exit))
12772            buffers))))))
12773
12774 (defun gnus-summary-setup-default-charset ()
12775   "Setup newsgroup default charset."
12776   (if (member gnus-newsgroup-name '("nndraft:delayed" "nndraft:drafts"))
12777       (setq gnus-newsgroup-charset nil)
12778     (let* ((ignored-charsets
12779             (or gnus-newsgroup-ephemeral-ignored-charsets
12780                 (append
12781                  (and gnus-newsgroup-name
12782                       (gnus-parameter-ignored-charsets gnus-newsgroup-name))
12783                  gnus-newsgroup-ignored-charsets))))
12784       (setq gnus-newsgroup-charset
12785             (or gnus-newsgroup-ephemeral-charset
12786                 (and gnus-newsgroup-name
12787                      (gnus-parameter-charset gnus-newsgroup-name))
12788                 gnus-default-charset))
12789       (set (make-local-variable 'gnus-newsgroup-ignored-charsets)
12790            ignored-charsets))))
12791
12792 ;;;
12793 ;;; Mime Commands
12794 ;;;
12795
12796 (defun gnus-summary-display-buttonized (&optional show-all-parts)
12797   "Display the current article buffer fully MIME-buttonized.
12798 If SHOW-ALL-PARTS (the prefix) is non-nil, all multipart/* parts are
12799 treated as multipart/mixed."
12800   (interactive "P")
12801   (require 'gnus-art)
12802   (let ((gnus-unbuttonized-mime-types nil)
12803         (gnus-mime-display-multipart-as-mixed show-all-parts))
12804     (gnus-summary-show-article)))
12805
12806 (defun gnus-summary-repair-multipart (article)
12807   "Add a Content-Type header to a multipart article without one."
12808   (interactive (list (gnus-summary-article-number)))
12809   (gnus-with-article article
12810     (message-narrow-to-head)
12811     (message-remove-header "Mime-Version")
12812     (goto-char (point-max))
12813     (insert "Mime-Version: 1.0\n")
12814     (widen)
12815     (when (search-forward "\n--" nil t)
12816       (let ((separator (buffer-substring (point) (point-at-eol))))
12817         (message-narrow-to-head)
12818         (message-remove-header "Content-Type")
12819         (goto-char (point-max))
12820         (insert (format "Content-Type: multipart/mixed; boundary=\"%s\"\n"
12821                         separator))
12822         (widen))))
12823   (let (gnus-mark-article-hook)
12824     (gnus-summary-select-article t t nil article)))
12825
12826 (defun gnus-summary-toggle-display-buttonized ()
12827   "Toggle the buttonizing of the article buffer."
12828   (interactive)
12829   (require 'gnus-art)
12830   (if (setq gnus-inhibit-mime-unbuttonizing
12831             (not gnus-inhibit-mime-unbuttonizing))
12832       (let ((gnus-unbuttonized-mime-types nil))
12833         (gnus-summary-show-article))
12834     (gnus-summary-show-article)))
12835
12836 ;;;
12837 ;;; Generic summary marking commands
12838 ;;;
12839
12840 (defvar gnus-summary-marking-alist
12841   '((read gnus-del-mark "d")
12842     (unread gnus-unread-mark "u")
12843     (ticked gnus-ticked-mark "!")
12844     (dormant gnus-dormant-mark "?")
12845     (expirable gnus-expirable-mark "e"))
12846   "An alist of names/marks/keystrokes.")
12847
12848 (defvar gnus-summary-generic-mark-map (make-sparse-keymap))
12849 (defvar gnus-summary-mark-map)
12850
12851 (defun gnus-summary-make-all-marking-commands ()
12852   (define-key gnus-summary-mark-map "M" gnus-summary-generic-mark-map)
12853   (dolist (elem gnus-summary-marking-alist)
12854     (apply 'gnus-summary-make-marking-command elem)))
12855
12856 (defun gnus-summary-make-marking-command (name mark keystroke)
12857   (let ((map (make-sparse-keymap)))
12858     (define-key gnus-summary-generic-mark-map keystroke map)
12859     (dolist (lway `((next "next" next nil "n")
12860                     (next-unread "next unread" next t "N")
12861                     (prev "previous" prev nil "p")
12862                     (prev-unread "previous unread" prev t "P")
12863                     (nomove "" nil nil ,keystroke)))
12864       (let ((func (gnus-summary-make-marking-command-1
12865                    mark (car lway) lway name)))
12866         (setq func (eval func))
12867         (define-key map (nth 4 lway) func)))))
12868
12869 (defun gnus-summary-make-marking-command-1 (mark way lway name)
12870   `(defun ,(intern
12871             (format "gnus-summary-put-mark-as-%s%s"
12872                     name (if (eq way 'nomove)
12873                              ""
12874                            (concat "-" (symbol-name way)))))
12875      (n)
12876      ,(format
12877        "Mark the current article as %s%s.
12878 If N, the prefix, then repeat N times.
12879 If N is negative, move in reverse order.
12880 The difference between N and the actual number of articles marked is
12881 returned."
12882        name (cadr lway))
12883      (interactive "p")
12884      (gnus-summary-generic-mark n ,mark ',(nth 2 lway) ,(nth 3 lway))))
12885
12886 (defun gnus-summary-generic-mark (n mark move unread)
12887   "Mark N articles with MARK."
12888   (unless (derived-mode-p 'gnus-summary-mode)
12889     (error "This command can only be used in the summary buffer"))
12890   (gnus-summary-show-thread)
12891   (let ((nummove
12892          (cond
12893           ((eq move 'next) 1)
12894           ((eq move 'prev) -1)
12895           (t 0))))
12896     (if (zerop nummove)
12897         (setq n 1)
12898       (when (< n 0)
12899         (setq n (abs n)
12900               nummove (* -1 nummove))))
12901     (while (and (> n 0)
12902                 (gnus-summary-mark-article nil mark)
12903                 (zerop (gnus-summary-next-subject nummove unread t)))
12904       (setq n (1- n)))
12905     (when (/= 0 n)
12906       (gnus-message 7 "No more %sarticles" (if mark "" "unread ")))
12907     (gnus-summary-recenter)
12908     (gnus-summary-position-point)
12909     (gnus-set-mode-line 'summary)
12910     n))
12911
12912 (defun gnus-summary-insert-articles (articles)
12913   (when (setq articles
12914               (gnus-sorted-difference articles
12915                                       (mapcar (lambda (h)
12916                                                 (mail-header-number h))
12917                                               gnus-newsgroup-headers)))
12918     (setq gnus-newsgroup-headers
12919           (gnus-merge 'list
12920                       gnus-newsgroup-headers
12921                       (gnus-fetch-headers articles nil t)
12922                       'gnus-article-sort-by-number))
12923     (setq gnus-newsgroup-articles
12924           (gnus-sorted-nunion gnus-newsgroup-articles articles))
12925     ;; Suppress duplicates?
12926     (when gnus-suppress-duplicates
12927       (gnus-dup-suppress-articles))
12928
12929     (if (and gnus-fetch-old-headers
12930              (eq gnus-headers-retrieved-by 'nov))
12931         ;; We might want to build some more threads first.
12932         (if (eq gnus-fetch-old-headers 'invisible)
12933             (gnus-build-all-threads)
12934           (gnus-build-old-threads))
12935       ;; Mark the inserted articles that are unread as unread.
12936       (setq gnus-newsgroup-unreads
12937             (gnus-sorted-nunion
12938              gnus-newsgroup-unreads
12939              (gnus-sorted-nintersection
12940               (gnus-list-of-unread-articles gnus-newsgroup-name)
12941               articles)))
12942       ;; Mark the inserted articles as selected so that the information
12943       ;; of the marks having been changed by a user may be updated when
12944       ;; exiting this group.  See `gnus-summary-update-info'.
12945       (dolist (art articles)
12946         (setq gnus-newsgroup-unselected (delq art gnus-newsgroup-unselected))))
12947     ;; Let the Gnus agent mark articles as read.
12948     (when gnus-agent
12949       (gnus-agent-get-undownloaded-list))
12950     ;; Remove list identifiers from subject
12951     (gnus-summary-remove-list-identifiers)
12952     ;; First and last article in this newsgroup.
12953     (when gnus-newsgroup-headers
12954       (setq gnus-newsgroup-begin
12955             (mail-header-number (car gnus-newsgroup-headers))
12956             gnus-newsgroup-end
12957             (mail-header-number
12958              (gnus-last-element gnus-newsgroup-headers))))
12959     (when gnus-use-scoring
12960       (gnus-possibly-score-headers))))
12961
12962 (defun gnus-summary-insert-old-articles (&optional all)
12963   "Insert all old articles in this group.
12964 If ALL is non-nil, already read articles become readable.
12965 If ALL is a number, fetch this number of articles."
12966   (interactive "P")
12967   (prog1
12968       (let ((old (sort (mapcar 'car gnus-newsgroup-data) '<))
12969             older len)
12970         (setq older
12971               ;; Some nntp servers lie about their active range.  When
12972               ;; this happens, the active range can be in the millions.
12973               ;; Use a compressed range to avoid creating a huge list.
12974               (gnus-range-difference
12975                (gnus-range-difference (list gnus-newsgroup-active) old)
12976                gnus-newsgroup-unexist))
12977         (setq len (gnus-range-length older))
12978         (cond
12979          ((null older) nil)
12980          ((numberp all)
12981           (if (< all len)
12982               (let ((older-range (nreverse older)))
12983                 (setq older nil)
12984
12985                 (while (> all 0)
12986                   (let* ((r (pop older-range))
12987                          (min (if (numberp r) r (car r)))
12988                          (max (if (numberp r) r (cdr r))))
12989                     (while (and (<= min max)
12990                                 (> all 0))
12991                       (push max older)
12992                       (setq all (1- all)
12993                             max (1- max))))))
12994             (setq older (gnus-uncompress-range older))))
12995          (all
12996           (setq older (gnus-uncompress-range older)))
12997          (t
12998           (when (and (numberp gnus-large-newsgroup)
12999                    (> len gnus-large-newsgroup))
13000               (let* ((cursor-in-echo-area nil)
13001                      (initial (gnus-parameter-large-newsgroup-initial
13002                                gnus-newsgroup-name))
13003                      (input
13004                       (read-string
13005                        (format
13006                         "How many articles from %s (%s %d): "
13007                         (gnus-group-decoded-name gnus-newsgroup-name)
13008                         (if initial "max" "default")
13009                         len)
13010                        nil nil
13011                        (and initial
13012                             (number-to-string initial)))))
13013                 (unless (string-match "^[ \t]*$" input)
13014                   (setq all (string-to-number input))
13015                   (if (< all len)
13016                       (let ((older-range (nreverse older)))
13017                         (setq older nil)
13018
13019                         (while (> all 0)
13020                           (let* ((r (pop older-range))
13021                                  (min (if (numberp r) r (car r)))
13022                                  (max (if (numberp r) r (cdr r))))
13023                             (while (and (<= min max)
13024                                         (> all 0))
13025                               (push max older)
13026                               (setq all (1- all)
13027                                     max (1- max))))))))))
13028           (setq older (gnus-uncompress-range older))))
13029         (if (not older)
13030             (message "No old news.")
13031           (gnus-summary-insert-articles older)
13032           (gnus-summary-limit (gnus-sorted-nunion old older))))
13033     (gnus-summary-position-point)))
13034
13035 (defun gnus-summary-insert-new-articles ()
13036   "Insert all new articles in this group."
13037   (interactive)
13038   (let ((old (sort (mapcar 'car gnus-newsgroup-data) '<))
13039         (old-high gnus-newsgroup-highest)
13040         (nnmail-fetched-sources (list t))
13041         (new-active (gnus-activate-group gnus-newsgroup-name 'scan))
13042         i new)
13043     (unless new-active
13044       (error "Couldn't fetch new data"))
13045     (setq gnus-newsgroup-active (gnus-copy-sequence new-active))
13046     (setq i (cdr gnus-newsgroup-active)
13047           gnus-newsgroup-highest i)
13048     (while (> i old-high)
13049       (push i new)
13050       (decf i))
13051     (if (not new)
13052         (message "No gnus is bad news")
13053       (gnus-summary-insert-articles new)
13054       (setq gnus-newsgroup-unreads
13055             (gnus-sorted-nunion gnus-newsgroup-unreads new))
13056       (gnus-summary-limit (gnus-sorted-nunion old new))))
13057   (gnus-summary-position-point))
13058
13059 ;;; Bookmark support for Gnus.
13060 (declare-function gnus-article-show-summary "gnus-art" ())
13061 (declare-function bookmark-make-record-default
13062                   "bookmark" (&optional no-file no-context posn))
13063 (declare-function bookmark-prop-get "bookmark" (bookmark prop))
13064 (declare-function bookmark-default-handler "bookmark" (bmk))
13065 (declare-function bookmark-get-bookmark-record "bookmark" (bmk))
13066 (defvar bookmark-yank-point)
13067 (defvar bookmark-current-buffer)
13068
13069 (defun gnus-summary-bookmark-make-record ()
13070   "Make a bookmark entry for a Gnus summary buffer."
13071   (let (pos buf)
13072     (unless (and (derived-mode-p 'gnus-summary-mode) gnus-article-current)
13073       (save-restriction              ; FIXME is it necessary to widen?
13074         (widen) (setq pos (point))) ; Set position in gnus-article buffer.
13075       (setq buf "art") ; We are recording bookmark from article buffer.
13076       (setq bookmark-yank-point (point))
13077       (setq bookmark-current-buffer (current-buffer))
13078       (gnus-article-show-summary))      ; Go back in summary buffer.
13079     ;; We are now recording bookmark from summary buffer.
13080     (unless buf (setq buf "sum"))
13081     (let* ((subject (elt (gnus-summary-article-header) 1))
13082            (grp     (car gnus-article-current))
13083            (art     (cdr gnus-article-current))
13084            (head    (gnus-summary-article-header art))
13085            (id      (mail-header-id head)))
13086       `(,subject
13087         ,@(condition-case nil
13088               (bookmark-make-record-default 'no-file 'no-context pos)
13089             (wrong-number-of-arguments
13090              (bookmark-make-record-default 'point-only)))
13091         (location . ,(format "Gnus-%s %s:%d:%s" buf grp art id))
13092         (group . ,grp) (article . ,art)
13093         (message-id . ,id) (handler . gnus-summary-bookmark-jump)))))
13094
13095 ;;;###autoload
13096 (defun gnus-summary-bookmark-jump (bookmark)
13097   "Handler function for record returned by `gnus-summary-bookmark-make-record'.
13098 BOOKMARK is a bookmark name or a bookmark record."
13099   (let ((group    (bookmark-prop-get bookmark 'group))
13100         (article  (bookmark-prop-get bookmark 'article))
13101         (id       (bookmark-prop-get bookmark 'message-id))
13102         (buf      (car (split-string (bookmark-prop-get bookmark 'location)))))
13103     (gnus-fetch-group group (list article))
13104     (gnus-summary-insert-cached-articles)
13105     (gnus-summary-goto-article id nil 'force)
13106     ;; FIXME we have to wait article buffer is ready (only large buffer)
13107     ;; Is there a better solution to know that?
13108     ;; If we don't wait `bookmark-default-handler' will have no chance
13109     ;; to set position. However there is no error, just wrong pos.
13110     (sit-for 1)
13111     (when (string= buf "Gnus-art")
13112       (other-window 1))
13113     (bookmark-default-handler
13114      `(""
13115        (buffer . ,(current-buffer))
13116        . ,(bookmark-get-bookmark-record bookmark)))))
13117
13118 (gnus-summary-make-all-marking-commands)
13119
13120 (gnus-ems-redefine)
13121
13122 (provide 'gnus-sum)
13123
13124 (run-hooks 'gnus-sum-load-hook)
13125
13126 ;; Local Variables:
13127 ;; coding: utf-8
13128 ;; End:
13129
13130 ;;; gnus-sum.el ends here