lisp/gnus/gnus-sum.el

   1 ;;; gnus-sum.el --- summary mode commands for Gnus
   2
   3 ;; Copyright (C) 1996-2016 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   [backspace] gnus-summary-delete-article
2224   "m" gnus-summary-move-article
2225   "r" gnus-summary-respool-article
2226   "w" gnus-summary-edit-article
2227   "c" gnus-summary-copy-article
2228   "B" gnus-summary-crosspost-article
2229   "q" gnus-summary-respool-query
2230   "t" gnus-summary-respool-trace
2231   "i" gnus-summary-import-article
2232   "I" gnus-summary-create-article
2233   "p" gnus-summary-article-posted-p)
2234
2235 (gnus-define-keys (gnus-summary-save-map "O" gnus-summary-mode-map)
2236   "o" gnus-summary-save-article
2237   "m" gnus-summary-save-article-mail
2238   "F" gnus-summary-write-article-file
2239   "r" gnus-summary-save-article-rmail
2240   "f" gnus-summary-save-article-file
2241   "b" gnus-summary-save-article-body-file
2242   "B" gnus-summary-write-article-body-file
2243   "h" gnus-summary-save-article-folder
2244   "v" gnus-summary-save-article-vm
2245   "p" gnus-summary-pipe-output
2246   "P" gnus-summary-muttprint)
2247
2248 (gnus-define-keys (gnus-summary-mime-map "K" gnus-summary-mode-map)
2249   "b" gnus-summary-display-buttonized
2250   "m" gnus-summary-repair-multipart
2251   "v" gnus-article-view-part
2252   "o" gnus-article-save-part
2253   "O" gnus-article-save-part-and-strip
2254   "r" gnus-article-replace-part
2255   "d" gnus-article-delete-part
2256   "t" gnus-article-view-part-as-type
2257   "j" gnus-article-jump-to-part
2258   "c" gnus-article-copy-part
2259   "C" gnus-article-view-part-as-charset
2260   "e" gnus-article-view-part-externally
2261   "H" gnus-article-browse-html-article
2262   "E" gnus-article-encrypt-body
2263   "i" gnus-article-inline-part
2264   "|" gnus-article-pipe-part)
2265
2266 (gnus-define-keys (gnus-uu-mark-map "P" gnus-summary-mark-map)
2267   "p" gnus-summary-mark-as-processable
2268   "u" gnus-summary-unmark-as-processable
2269   "U" gnus-summary-unmark-all-processable
2270   "v" gnus-uu-mark-over
2271   "s" gnus-uu-mark-series
2272   "r" gnus-uu-mark-region
2273   "g" gnus-uu-unmark-region
2274   "R" gnus-uu-mark-by-regexp
2275   "G" gnus-uu-unmark-by-regexp
2276   "t" gnus-uu-mark-thread
2277   "T" gnus-uu-unmark-thread
2278   "a" gnus-uu-mark-all
2279   "b" gnus-uu-mark-buffer
2280   "S" gnus-uu-mark-sparse
2281   "k" gnus-summary-kill-process-mark
2282   "y" gnus-summary-yank-process-mark
2283   "w" gnus-summary-save-process-mark
2284   "i" gnus-uu-invert-processable)
2285
2286 (gnus-define-keys (gnus-uu-extract-map "X" gnus-summary-mode-map)
2287   ;;"x" gnus-uu-extract-any
2288   "m" gnus-summary-save-parts
2289   "u" gnus-uu-decode-uu
2290   "U" gnus-uu-decode-uu-and-save
2291   "s" gnus-uu-decode-unshar
2292   "S" gnus-uu-decode-unshar-and-save
2293   "o" gnus-uu-decode-save
2294   "O" gnus-uu-decode-save
2295   "b" gnus-uu-decode-binhex
2296   "B" gnus-uu-decode-binhex
2297   "Y" gnus-uu-decode-yenc
2298   "p" gnus-uu-decode-postscript
2299   "P" gnus-uu-decode-postscript-and-save)
2300
2301 (gnus-define-keys
2302     (gnus-uu-extract-view-map "v" gnus-uu-extract-map)
2303   "u" gnus-uu-decode-uu-view
2304   "U" gnus-uu-decode-uu-and-save-view
2305   "s" gnus-uu-decode-unshar-view
2306   "S" gnus-uu-decode-unshar-and-save-view
2307   "o" gnus-uu-decode-save-view
2308   "O" gnus-uu-decode-save-view
2309   "b" gnus-uu-decode-binhex-view
2310   "B" gnus-uu-decode-binhex-view
2311   "p" gnus-uu-decode-postscript-view
2312   "P" gnus-uu-decode-postscript-and-save-view)
2313
2314 (defvar gnus-article-post-menu nil)
2315
2316 (defconst gnus-summary-menu-maxlen 20)
2317
2318 (defun gnus-summary-menu-split (menu)
2319   ;; If we have lots of elements, divide them into groups of 20
2320   ;; and make a pane (or submenu) for each one.
2321   (if (> (length menu) (/ (* gnus-summary-menu-maxlen 3) 2))
2322       (let ((menu menu) sublists next
2323             (i 1))
2324         (while menu
2325           ;; Pull off the next gnus-summary-menu-maxlen elements
2326           ;; and make them the next element of sublist.
2327           (setq next (nthcdr gnus-summary-menu-maxlen menu))
2328           (if next
2329               (setcdr (nthcdr (1- gnus-summary-menu-maxlen) menu)
2330                       nil))
2331           (setq sublists (cons (cons (format "%s ... %s" (aref (car menu) 0)
2332                                              (aref (car (last menu)) 0)) menu)
2333                                sublists))
2334           (setq i (1+ i))
2335           (setq menu next))
2336         (nreverse sublists))
2337     ;; Few elements--put them all in one pane.
2338     menu))
2339
2340 (defun gnus-summary-make-menu-bar ()
2341   (gnus-turn-off-edit-menu 'summary)
2342
2343   (unless (boundp 'gnus-summary-misc-menu)
2344
2345     (easy-menu-define
2346       gnus-summary-kill-menu gnus-summary-mode-map ""
2347       (cons
2348        "Score"
2349        (nconc
2350         (list
2351          ["Customize" gnus-score-customize t])
2352         (gnus-make-score-map 'increase)
2353         (gnus-make-score-map 'lower)
2354         '(("Mark"
2355            ["Kill below" gnus-summary-kill-below t]
2356            ["Mark above" gnus-summary-mark-above t]
2357            ["Tick above" gnus-summary-tick-above t]
2358            ["Clear above" gnus-summary-clear-above t])
2359           ["Current article score" gnus-summary-current-score t]
2360           ["Current thread score" (gnus-summary-current-score 'total) t]
2361           ["Set score" gnus-summary-set-score t]
2362           ["Switch current score file..." gnus-score-change-score-file t]
2363           ["Set mark below..." gnus-score-set-mark-below t]
2364           ["Set expunge below..." gnus-score-set-expunge-below t]
2365           ["Edit current score file" gnus-score-edit-current-scores t]
2366           ["Edit score file..." gnus-score-edit-file t]
2367           ["Trace score" gnus-score-find-trace t]
2368           ["Find words" gnus-score-find-favourite-words t]
2369           ["Rescore buffer" gnus-summary-rescore t]
2370           ["Increase score..." gnus-summary-increase-score t]
2371           ["Lower score..." gnus-summary-lower-score t]))))
2372
2373     ;; Define both the Article menu in the summary buffer and the
2374     ;; equivalent Commands menu in the article buffer here for
2375     ;; consistency.
2376     (let ((innards
2377            `(("Hide"
2378               ["All" gnus-article-hide t]
2379               ["Headers" gnus-article-hide-headers t]
2380               ["Signature" gnus-article-hide-signature t]
2381               ["Citation" gnus-article-hide-citation t]
2382               ["List identifiers" gnus-article-hide-list-identifiers t]
2383               ["Banner" gnus-article-strip-banner t]
2384               ["Boring headers" gnus-article-hide-boring-headers t])
2385              ("Highlight"
2386               ["All" gnus-article-highlight t]
2387               ["Headers" gnus-article-highlight-headers t]
2388               ["Signature" gnus-article-highlight-signature t]
2389               ["Citation" gnus-article-highlight-citation t])
2390              ("MIME"
2391               ["Words" gnus-article-decode-mime-words t]
2392               ["Charset" gnus-article-decode-charset t]
2393               ["QP" gnus-article-de-quoted-unreadable t]
2394               ["Base64" gnus-article-de-base64-unreadable t]
2395               ["View MIME buttons" gnus-summary-display-buttonized t]
2396               ["View MIME buttons in header"
2397                gnus-mime-buttonize-attachments-in-header t]
2398               ["View all" gnus-mime-view-all-parts t]
2399               ["Verify and Decrypt" gnus-summary-force-verify-and-decrypt t]
2400               ["Encrypt body" gnus-article-encrypt-body
2401                :active (not (gnus-group-read-only-p))
2402                ,@(if (featurep 'xemacs) nil
2403                    '(:help "Encrypt the message body on disk"))]
2404               ["Extract all parts..." gnus-summary-save-parts t]
2405               ("Multipart"
2406                ["Repair multipart" gnus-summary-repair-multipart t]
2407                ["Pipe part..." gnus-article-pipe-part t]
2408                ["Inline part" gnus-article-inline-part t]
2409                ["View part as type..." gnus-article-view-part-as-type t]
2410                ["Encrypt body" gnus-article-encrypt-body
2411                 :active (not (gnus-group-read-only-p))
2412                ,@(if (featurep 'xemacs) nil
2413                    '(:help "Encrypt the message body on disk"))]
2414                ["View part externally" gnus-article-view-part-externally t]
2415                ["View HTML parts in browser" gnus-article-browse-html-article t]
2416                ["View part with charset..." gnus-article-view-part-as-charset t]
2417                ["Copy part" gnus-article-copy-part t]
2418                ["Save part..." gnus-article-save-part t]
2419                ["View part" gnus-article-view-part t]))
2420              ("Date"
2421               ["Local" gnus-article-date-local t]
2422               ["ISO8601" gnus-article-date-iso8601 t]
2423               ["UT" gnus-article-date-ut t]
2424               ["Original" gnus-article-date-original t]
2425               ["Lapsed" gnus-article-date-lapsed t]
2426               ["User-defined" gnus-article-date-user t])
2427              ("Display"
2428               ["Display HTML images" gnus-article-show-images t]
2429               ["Remove images" gnus-article-remove-images t]
2430               ["Toggle smiley" gnus-treat-smiley t]
2431               ["Show X-Face" gnus-article-display-x-face t]
2432               ["Show picons in From" gnus-treat-from-picon t]
2433               ["Show picons in mail headers" gnus-treat-mail-picon t]
2434               ["Show picons in news headers" gnus-treat-newsgroups-picon t]
2435               ["Show Gravatars in From" gnus-treat-from-gravatar t]
2436               ["Show Gravatars in mail headers" gnus-treat-mail-gravatar t]
2437               ("View as different encoding"
2438                ,@(gnus-summary-menu-split
2439                   (mapcar
2440                    (lambda (cs)
2441                      ;; Since easymenu under Emacs doesn't allow
2442                      ;; lambda forms for menu commands, we should
2443                      ;; provide intern'ed function symbols.
2444                      (let ((command (intern (format "\
2445 gnus-summary-show-article-from-menu-as-charset-%s" cs))))
2446                        (fset command
2447                              `(lambda ()
2448                                 (interactive)
2449                                 (let ((gnus-summary-show-article-charset-alist
2450                                        '((1 . ,cs))))
2451                                   (gnus-summary-show-article 1))))
2452                        `[,(symbol-name cs) ,command t]))
2453                    (sort (if (fboundp 'coding-system-list)
2454                              (coding-system-list)
2455                            (mapcar 'car mm-mime-mule-charset-alist))
2456                          'string<)))))
2457              ("Washing"
2458               ("Remove Blanks"
2459                ["Leading" gnus-article-strip-leading-blank-lines t]
2460                ["Multiple" gnus-article-strip-multiple-blank-lines t]
2461                ["Trailing" gnus-article-remove-trailing-blank-lines t]
2462                ["All of the above" gnus-article-strip-blank-lines t]
2463                ["All" gnus-article-strip-all-blank-lines t]
2464                ["Leading space" gnus-article-strip-leading-space t]
2465                ["Trailing space" gnus-article-strip-trailing-space t]
2466                ["Leading space in headers"
2467                 gnus-article-remove-leading-whitespace t])
2468               ["Overstrike" gnus-article-treat-overstrike t]
2469               ["Dumb quotes" gnus-article-treat-dumbquotes t]
2470               ["Non-ASCII" gnus-article-treat-non-ascii t]
2471               ["Emphasis" gnus-article-emphasize t]
2472               ["Word wrap" gnus-article-fill-cited-article t]
2473               ["Fill long lines" gnus-article-fill-long-lines t]
2474               ["Toggle truncate long lines" gnus-article-toggle-truncate-lines t]
2475               ["Capitalize sentences" gnus-article-capitalize-sentences t]
2476               ["Remove CR" gnus-article-remove-cr t]
2477               ["Quoted-Printable" gnus-article-de-quoted-unreadable t]
2478               ["Base64" gnus-article-de-base64-unreadable t]
2479               ["Rot 13" gnus-summary-caesar-message
2480                ,@(if (featurep 'xemacs) '(t)
2481                    '(:help "\"Caesar rotate\" article by 13"))]
2482               ["De-IDNA" gnus-summary-idna-message t]
2483               ["Morse decode" gnus-summary-morse-message t]
2484               ["Unix pipe..." gnus-summary-pipe-message t]
2485               ["Add buttons" gnus-article-add-buttons t]
2486               ["Add buttons to head" gnus-article-add-buttons-to-head t]
2487               ["Stop page breaking" gnus-summary-stop-page-breaking t]
2488               ["Verbose header" gnus-summary-verbose-headers t]
2489               ["Toggle header" gnus-summary-toggle-header t]
2490               ["Unfold headers" gnus-article-treat-unfold-headers t]
2491               ["Fold newsgroups" gnus-article-treat-fold-newsgroups t]
2492               ["Html" gnus-article-wash-html t]
2493               ["Unsplit URLs" gnus-article-unsplit-urls t]
2494               ["Verify X-PGP-Sig" gnus-article-verify-x-pgp-sig t]
2495               ["Decode HZ" gnus-article-decode-HZ t]
2496               ["ANSI sequences" gnus-article-treat-ansi-sequences t]
2497               ("(Outlook) Deuglify"
2498                ["Unwrap lines" gnus-article-outlook-unwrap-lines t]
2499                ["Repair attribution" gnus-article-outlook-repair-attribution t]
2500                ["Rearrange citation" gnus-article-outlook-rearrange-citation t]
2501                ["Full (Outlook) deuglify"
2502                 gnus-article-outlook-deuglify-article t])
2503               )
2504              ("Output"
2505               ["Save in default format..." gnus-summary-save-article
2506                ,@(if (featurep 'xemacs) '(t)
2507                    '(:help "Save article using default method"))]
2508               ["Save in file..." gnus-summary-save-article-file
2509                ,@(if (featurep 'xemacs) '(t)
2510                    '(:help "Save article in file"))]
2511               ["Save in Unix mail format..." gnus-summary-save-article-mail t]
2512               ["Save in MH folder..." gnus-summary-save-article-folder t]
2513               ["Save in VM folder..." gnus-summary-save-article-vm t]
2514               ["Save in RMAIL mbox..." gnus-summary-save-article-rmail t]
2515               ["Save body in file..." gnus-summary-save-article-body-file t]
2516               ["Pipe through a filter..." gnus-summary-pipe-output t]
2517               ["Print with Muttprint..." gnus-summary-muttprint t]
2518               ["Print" gnus-summary-print-article
2519                ,@(if (featurep 'xemacs) '(t)
2520                    '(:help "Generate and print a PostScript image"))])
2521              ("Copy, move,... (Backend)"
2522               ,@(if (featurep 'xemacs) nil
2523                   '(:help "Copying, moving, expiring articles..."))
2524               ["Respool article..." gnus-summary-respool-article t]
2525               ["Move article..." gnus-summary-move-article
2526                (gnus-check-backend-function
2527                 'request-move-article gnus-newsgroup-name)]
2528               ["Copy article..." gnus-summary-copy-article t]
2529               ["Crosspost article..." gnus-summary-crosspost-article
2530                (gnus-check-backend-function
2531                 'request-replace-article gnus-newsgroup-name)]
2532               ["Import file..." gnus-summary-import-article
2533                (gnus-check-backend-function
2534                 'request-accept-article gnus-newsgroup-name)]
2535               ["Create article..." gnus-summary-create-article
2536                (gnus-check-backend-function
2537                 'request-accept-article gnus-newsgroup-name)]
2538               ["Check if posted" gnus-summary-article-posted-p t]
2539               ["Edit article" gnus-summary-edit-article
2540                (not (gnus-group-read-only-p))]
2541               ["Delete article" gnus-summary-delete-article
2542                (gnus-check-backend-function
2543                 'request-expire-articles gnus-newsgroup-name)]
2544               ["Query respool" gnus-summary-respool-query t]
2545               ["Trace respool" gnus-summary-respool-trace t]
2546               ["Delete expirable articles" gnus-summary-expire-articles-now
2547                (gnus-check-backend-function
2548                 'request-expire-articles gnus-newsgroup-name)])
2549              ("Extract"
2550               ["Uudecode" gnus-uu-decode-uu
2551                ,@(if (featurep 'xemacs) '(t)
2552                    '(:help "Decode uuencoded article(s)"))]
2553               ["Uudecode and save" gnus-uu-decode-uu-and-save t]
2554               ["Unshar" gnus-uu-decode-unshar t]
2555               ["Unshar and save" gnus-uu-decode-unshar-and-save t]
2556               ["Save" gnus-uu-decode-save t]
2557               ["Binhex" gnus-uu-decode-binhex t]
2558               ["PostScript" gnus-uu-decode-postscript t]
2559               ["All MIME parts" gnus-summary-save-parts t])
2560              ("Cache"
2561               ["Enter article" gnus-cache-enter-article t]
2562               ["Remove article" gnus-cache-remove-article t])
2563              ["Translate" gnus-article-babel t]
2564              ["Select article buffer" gnus-summary-select-article-buffer t]
2565              ["Make article buffer sticky" gnus-sticky-article t]
2566              ["Enter digest buffer" gnus-summary-enter-digest-group t]
2567              ["Isearch article..." gnus-summary-isearch-article t]
2568              ["Beginning of the article" gnus-summary-beginning-of-article t]
2569              ["End of the article" gnus-summary-end-of-article t]
2570              ["Fetch parent of article" gnus-summary-refer-parent-article t]
2571              ["Fetch referenced articles" gnus-summary-refer-references t]
2572              ["Fetch current thread" gnus-summary-refer-thread t]
2573              ["Fetch article with id..." gnus-summary-refer-article t]
2574              ["Setup Mailing List Params" gnus-mailing-list-insinuate t]
2575              ["Redisplay" gnus-summary-show-article t]
2576              ["Raw article" gnus-summary-show-raw-article :keys "C-u g"])))
2577       (easy-menu-define
2578         gnus-summary-article-menu gnus-summary-mode-map ""
2579         (cons "Article" innards))
2580
2581       (if (not (keymapp gnus-summary-article-menu))
2582           (easy-menu-define
2583             gnus-article-commands-menu gnus-article-mode-map ""
2584             (cons "Commands" innards))
2585         ;; in Emacs, don't share menu.
2586         (setq gnus-article-commands-menu
2587               (copy-keymap gnus-summary-article-menu))
2588         (define-key gnus-article-mode-map [menu-bar commands]
2589           (cons "Commands" gnus-article-commands-menu))))
2590
2591     (easy-menu-define
2592       gnus-summary-thread-menu gnus-summary-mode-map ""
2593       '("Threads"
2594         ["Find all messages in thread" gnus-summary-refer-thread t]
2595         ["Toggle threading" gnus-summary-toggle-threads t]
2596         ["Hide threads" gnus-summary-hide-all-threads t]
2597         ["Show threads" gnus-summary-show-all-threads t]
2598         ["Hide thread" gnus-summary-hide-thread t]
2599         ["Show thread" gnus-summary-show-thread t]
2600         ["Go to next thread" gnus-summary-next-thread t]
2601         ["Go to previous thread" gnus-summary-prev-thread t]
2602         ["Go down thread" gnus-summary-down-thread t]
2603         ["Go up thread" gnus-summary-up-thread t]
2604         ["Top of thread" gnus-summary-top-thread t]
2605         ["Mark thread as read" gnus-summary-kill-thread t]
2606         ["Mark thread as expired" gnus-summary-expire-thread t]
2607         ["Lower thread score" gnus-summary-lower-thread t]
2608         ["Raise thread score" gnus-summary-raise-thread t]
2609         ["Rethread current" gnus-summary-rethread-current t]))
2610
2611     (easy-menu-define
2612       gnus-summary-post-menu gnus-summary-mode-map ""
2613       `("Post"
2614         ["Send a message (mail or news)" gnus-summary-post-news
2615          ,@(if (featurep 'xemacs) '(t)
2616              '(:help "Compose a new message (mail or news)"))]
2617         ["Followup" gnus-summary-followup
2618          ,@(if (featurep 'xemacs) '(t)
2619              '(:help "Post followup to this article"))]
2620         ["Followup and yank" gnus-summary-followup-with-original
2621          ,@(if (featurep 'xemacs) '(t)
2622              '(:help "Post followup to this article, quoting its contents"))]
2623         ["Supersede article" gnus-summary-supersede-article t]
2624         ["Cancel article" gnus-summary-cancel-article
2625          ,@(if (featurep 'xemacs) '(t)
2626              '(:help "Cancel an article you posted"))]
2627         ["Reply" gnus-summary-reply t]
2628         ["Reply and yank" gnus-summary-reply-with-original t]
2629         ["Wide reply" gnus-summary-wide-reply t]
2630         ["Wide reply and yank" gnus-summary-wide-reply-with-original
2631          ,@(if (featurep 'xemacs) '(t)
2632              '(:help "Mail a reply, quoting this article"))]
2633         ["Very wide reply" gnus-summary-very-wide-reply t]
2634         ["Very wide reply and yank" gnus-summary-very-wide-reply-with-original
2635          ,@(if (featurep 'xemacs) '(t)
2636              '(:help "Mail a very wide reply, quoting this article"))]
2637         ["Mail forward" gnus-summary-mail-forward t]
2638         ["Post forward" gnus-summary-post-forward t]
2639         ["Digest and mail" gnus-uu-digest-mail-forward t]
2640         ["Digest and post" gnus-uu-digest-post-forward t]
2641         ["Resend message" gnus-summary-resend-message t]
2642         ["Resend message edit" gnus-summary-resend-message-edit t]
2643         ["Send bounced mail" gnus-summary-resend-bounced-mail t]
2644         ["Send a mail" gnus-summary-mail-other-window t]
2645         ["Create a local message" gnus-summary-news-other-window t]
2646         ["Uuencode and post" gnus-uu-post-news
2647          ,@(if (featurep 'xemacs) '(t)
2648              '(:help "Post a uuencoded article"))]
2649         ["Followup via news" gnus-summary-followup-to-mail t]
2650         ["Followup via news and yank"
2651          gnus-summary-followup-to-mail-with-original t]
2652         ["Strip signature on reply"
2653          (lambda ()
2654            (interactive)
2655            (if (not (memq message-cite-function
2656                           '(message-cite-original-without-signature
2657                             message-cite-original)))
2658                ;; Stupid workaround for XEmacs not honoring :visible.
2659                (message "Can't toggle this value of `message-cite-function'")
2660              (setq message-cite-function
2661                    (if (eq message-cite-function
2662                            'message-cite-original-without-signature)
2663                        'message-cite-original
2664                      'message-cite-original-without-signature))))
2665          ;; XEmacs barfs on :visible.
2666          ,@(if (featurep 'xemacs) nil
2667              '(:visible (memq message-cite-function
2668                               '(message-cite-original-without-signature
2669                                 message-cite-original))))
2670          :style toggle
2671          :selected (eq message-cite-function
2672                        'message-cite-original-without-signature)
2673          ,@(if (featurep 'xemacs) nil
2674              '(:help "Strip signature from cited article when replying."))]
2675         ;;("Draft"
2676         ;;["Send" gnus-summary-send-draft t]
2677         ;;["Send bounced" gnus-resend-bounced-mail t])
2678         ))
2679
2680     (cond
2681      ((not (keymapp gnus-summary-post-menu))
2682       (setq gnus-article-post-menu gnus-summary-post-menu))
2683      ((not gnus-article-post-menu)
2684       ;; Don't share post menu.
2685       (setq gnus-article-post-menu
2686             (copy-keymap gnus-summary-post-menu))))
2687     (define-key gnus-article-mode-map [menu-bar post]
2688       (cons "Post" gnus-article-post-menu))
2689
2690     (easy-menu-define
2691       gnus-summary-misc-menu gnus-summary-mode-map ""
2692       `("Gnus"
2693         ("Mark Read"
2694          ["Mark as read" gnus-summary-mark-as-read-forward t]
2695          ["Mark same subject and select"
2696           gnus-summary-kill-same-subject-and-select t]
2697          ["Mark same subject" gnus-summary-kill-same-subject t]
2698          ["Catchup" gnus-summary-catchup
2699           ,@(if (featurep 'xemacs) '(t)
2700               '(:help "Mark unread articles in this group as read"))]
2701          ["Catchup all" gnus-summary-catchup-all t]
2702          ["Catchup to here" gnus-summary-catchup-to-here t]
2703          ["Catchup from here" gnus-summary-catchup-from-here t]
2704          ["Catchup region" gnus-summary-mark-region-as-read
2705           (gnus-mark-active-p)]
2706          ["Mark excluded" gnus-summary-limit-mark-excluded-as-read t])
2707         ("Mark Various"
2708          ["Tick" gnus-summary-tick-article-forward t]
2709          ["Mark as dormant" gnus-summary-mark-as-dormant t]
2710          ["Remove marks" gnus-summary-clear-mark-forward t]
2711          ["Set expirable mark" gnus-summary-mark-as-expirable t]
2712          ["Set bookmark" gnus-summary-set-bookmark t]
2713          ["Remove bookmark" gnus-summary-remove-bookmark t])
2714         ("Limit to"
2715          ["Marks..." gnus-summary-limit-to-marks t]
2716          ["Subject..." gnus-summary-limit-to-subject t]
2717          ["Author..." gnus-summary-limit-to-author t]
2718          ["Recipient..." gnus-summary-limit-to-recipient t]
2719          ["Address..." gnus-summary-limit-to-address t]
2720          ["Age..." gnus-summary-limit-to-age t]
2721          ["Extra..." gnus-summary-limit-to-extra t]
2722          ["Score..." gnus-summary-limit-to-score t]
2723          ["Display Predicate" gnus-summary-limit-to-display-predicate t]
2724          ["Unread" gnus-summary-limit-to-unread t]
2725          ["Unseen" gnus-summary-limit-to-unseen t]
2726          ["Singletons" gnus-summary-limit-to-singletons t]
2727          ["Replied" gnus-summary-limit-to-replied t]
2728          ["Non-dormant" gnus-summary-limit-exclude-dormant t]
2729          ["Next or process marked articles" gnus-summary-limit-to-articles t]
2730          ["Pop limit" gnus-summary-pop-limit t]
2731          ["Show dormant" gnus-summary-limit-include-dormant t]
2732          ["Hide childless dormant"
2733           gnus-summary-limit-exclude-childless-dormant t]
2734          ;;["Hide thread" gnus-summary-limit-exclude-thread t]
2735          ["Hide marked" gnus-summary-limit-exclude-marks t]
2736          ["Show expunged" gnus-summary-limit-include-expunged t])
2737         ("Process Mark"
2738          ["Set mark" gnus-summary-mark-as-processable t]
2739          ["Remove mark" gnus-summary-unmark-as-processable t]
2740          ["Remove all marks" gnus-summary-unmark-all-processable t]
2741          ["Invert marks" gnus-uu-invert-processable t]
2742          ["Mark above" gnus-uu-mark-over t]
2743          ["Mark series" gnus-uu-mark-series t]
2744          ["Mark region" gnus-uu-mark-region (gnus-mark-active-p)]
2745          ["Unmark region" gnus-uu-unmark-region (gnus-mark-active-p)]
2746          ["Mark by regexp..." gnus-uu-mark-by-regexp t]
2747          ["Unmark by regexp..." gnus-uu-unmark-by-regexp t]
2748          ["Mark all" gnus-uu-mark-all t]
2749          ["Mark buffer" gnus-uu-mark-buffer t]
2750          ["Mark sparse" gnus-uu-mark-sparse t]
2751          ["Mark thread" gnus-uu-mark-thread t]
2752          ["Unmark thread" gnus-uu-unmark-thread t]
2753          ("Process Mark Sets"
2754           ["Kill" gnus-summary-kill-process-mark t]
2755           ["Yank" gnus-summary-yank-process-mark
2756            gnus-newsgroup-process-stack]
2757           ["Save" gnus-summary-save-process-mark t]
2758           ["Run command on marked..." gnus-summary-universal-argument t]))
2759         ("Registry Marks")
2760         ("Scroll article"
2761          ["Page forward" gnus-summary-next-page
2762           ,@(if (featurep 'xemacs) '(t)
2763               '(:help "Show next page of article"))]
2764          ["Page backward" gnus-summary-prev-page
2765           ,@(if (featurep 'xemacs) '(t)
2766               '(:help "Show previous page of article"))]
2767          ["Line forward" gnus-summary-scroll-up t])
2768         ("Move"
2769          ["Next unread article" gnus-summary-next-unread-article t]
2770          ["Previous unread article" gnus-summary-prev-unread-article t]
2771          ["Next article" gnus-summary-next-article t]
2772          ["Previous article" gnus-summary-prev-article t]
2773          ["Next unread subject" gnus-summary-next-unread-subject t]
2774          ["Previous unread subject" gnus-summary-prev-unread-subject t]
2775          ["Next article same subject" gnus-summary-next-same-subject t]
2776          ["Previous article same subject" gnus-summary-prev-same-subject t]
2777          ["First unread article" gnus-summary-first-unread-article t]
2778          ["Best unread article" gnus-summary-best-unread-article t]
2779          ["Go to subject number..." gnus-summary-goto-subject t]
2780          ["Go to article number..." gnus-summary-goto-article t]
2781          ["Go to the last article" gnus-summary-goto-last-article t]
2782          ["Pop article off history" gnus-summary-pop-article t])
2783         ("Sort"
2784          ["Sort by number" gnus-summary-sort-by-number t]
2785          ["Sort by most recent number" gnus-summary-sort-by-most-recent-number t]
2786          ["Sort by author" gnus-summary-sort-by-author t]
2787          ["Sort by recipient" gnus-summary-sort-by-recipient t]
2788          ["Sort by subject" gnus-summary-sort-by-subject t]
2789          ["Sort by date" gnus-summary-sort-by-date t]
2790          ["Sort by most recent date" gnus-summary-sort-by-most-recent-date t]
2791          ["Sort by score" gnus-summary-sort-by-score t]
2792          ["Sort by lines" gnus-summary-sort-by-lines t]
2793          ["Sort by characters" gnus-summary-sort-by-chars t]
2794          ["Randomize" gnus-summary-sort-by-random t]
2795          ["Original sort" gnus-summary-sort-by-original t])
2796         ("Help"
2797          ["Describe group" gnus-summary-describe-group t]
2798          ["Read manual" gnus-info-find-node t])
2799         ("Modes"
2800          ["Pick and read" gnus-pick-mode t]
2801          ["Binary" gnus-binary-mode t])
2802         ("Regeneration"
2803          ["Regenerate" gnus-summary-prepare t]
2804          ["Insert cached articles" gnus-summary-insert-cached-articles t]
2805          ["Insert dormant articles" gnus-summary-insert-dormant-articles t]
2806          ["Insert ticked articles" gnus-summary-insert-ticked-articles t]
2807          ["Toggle threading" gnus-summary-toggle-threads t])
2808         ["See old articles" gnus-summary-insert-old-articles t]
2809         ["See new articles" gnus-summary-insert-new-articles t]
2810         ["Filter articles..." gnus-summary-execute-command t]
2811         ["Run command on articles..." gnus-summary-universal-argument t]
2812         ["Search articles forward..." gnus-summary-search-article-forward t]
2813         ["Search articles backward..." gnus-summary-search-article-backward t]
2814         ["Toggle line truncation" gnus-summary-toggle-truncation t]
2815         ["Expand window" gnus-summary-expand-window t]
2816         ["Expire expirable articles" gnus-summary-expire-articles
2817          (gnus-check-backend-function
2818           'request-expire-articles gnus-newsgroup-name)]
2819         ["Edit local kill file" gnus-summary-edit-local-kill t]
2820         ["Edit main kill file" gnus-summary-edit-global-kill t]
2821         ["Edit group parameters" gnus-summary-edit-parameters t]
2822         ["Customize group parameters" gnus-summary-customize-parameters t]
2823         ["Send a bug report" gnus-bug t]
2824         ("Exit"
2825          ["Catchup and exit" gnus-summary-catchup-and-exit
2826           ,@(if (featurep 'xemacs) '(t)
2827               '(:help "Mark unread articles in this group as read, then exit"))]
2828          ["Catchup all and exit" gnus-summary-catchup-all-and-exit t]
2829          ["Catchup and goto next" gnus-summary-catchup-and-goto-next-group t]
2830          ["Catchup and goto prev" gnus-summary-catchup-and-goto-prev-group t]
2831          ["Exit group" gnus-summary-exit
2832           ,@(if (featurep 'xemacs) '(t)
2833               '(:help "Exit current group, return to group selection mode"))]
2834          ["Exit group without updating" gnus-summary-exit-no-update t]
2835          ["Exit and goto next group" gnus-summary-next-group t]
2836          ["Exit and goto prev group" gnus-summary-prev-group t]
2837          ["Reselect group" gnus-summary-reselect-current-group t]
2838          ["Rescan group" gnus-summary-rescan-group t]
2839          ["Update dribble" gnus-summary-save-newsrc t])))
2840
2841     (gnus-run-hooks 'gnus-summary-menu-hook)))
2842
2843 (defvar gnus-summary-tool-bar-map nil)
2844
2845 ;; Note: The :set function in the `gnus-summary-tool-bar*' variables will only
2846 ;; affect _new_ message buffers.  We might add a function that walks thru all
2847 ;; summary-mode buffers and force the update.
2848 (defun gnus-summary-tool-bar-update (&optional symbol value)
2849   "Update summary mode toolbar.
2850 Setter function for custom variables."
2851   (setq-default gnus-summary-tool-bar-map nil)
2852   (when symbol
2853     ;; When used as ":set" function:
2854     (set-default symbol value))
2855   (when (gnus-buffer-live-p gnus-summary-buffer)
2856     (with-current-buffer gnus-summary-buffer
2857       (gnus-summary-make-tool-bar))))
2858
2859 (defcustom gnus-summary-tool-bar (if (eq gmm-tool-bar-style 'gnome)
2860                                      'gnus-summary-tool-bar-gnome
2861                                    'gnus-summary-tool-bar-retro)
2862   "Specifies the Gnus summary tool bar.
2863
2864 It can be either a list or a symbol referring to a list.  See
2865 `gmm-tool-bar-from-list' for the format of the list.  The
2866 default key map is `gnus-summary-mode-map'.
2867
2868 Pre-defined symbols include `gnus-summary-tool-bar-gnome' and
2869 `gnus-summary-tool-bar-retro'."
2870   :type '(choice (const :tag "GNOME style" gnus-summary-tool-bar-gnome)
2871                  (const :tag "Retro look"  gnus-summary-tool-bar-retro)
2872                  (repeat :tag "User defined list" gmm-tool-bar-item)
2873                  (symbol))
2874   :version "23.1" ;; No Gnus
2875   :initialize 'custom-initialize-default
2876   :set 'gnus-summary-tool-bar-update
2877   :group 'gnus-summary)
2878
2879 (defcustom gnus-summary-tool-bar-gnome
2880   '((gnus-summary-post-news "mail/compose" nil)
2881     (gnus-summary-insert-new-articles "mail/inbox" nil
2882                                       :visible (or (not gnus-agent)
2883                                                    gnus-plugged))
2884     (gnus-summary-reply-with-original "mail/reply")
2885     (gnus-summary-reply "mail/reply" nil :visible nil)
2886     (gnus-summary-followup-with-original "mail/reply-all")
2887     (gnus-summary-followup "mail/reply-all" nil :visible nil)
2888     (gnus-summary-mail-forward "mail/forward")
2889     (gnus-summary-save-article "mail/save")
2890     (gnus-summary-search-article-forward "search" nil :visible nil)
2891     (gnus-summary-print-article "print")
2892     (gnus-summary-tick-article-forward "flag-followup" nil :visible nil)
2893     ;; Some new commands that may need more suitable icons:
2894     (gnus-summary-save-newsrc "save" nil :visible nil)
2895     ;; (gnus-summary-show-article "stock_message-display" nil :visible nil)
2896     (gnus-summary-prev-article "left-arrow")
2897     (gnus-summary-next-article "right-arrow")
2898     (gnus-summary-next-page "next-page")
2899     ;; (gnus-summary-enter-digest-group "right_arrow" nil :visible nil)
2900     ;;
2901     ;; Maybe some sort-by-... could be added:
2902     ;; (gnus-summary-sort-by-author "sort-a-z" nil :visible nil)
2903     ;; (gnus-summary-sort-by-date "sort-1-9" nil :visible nil)
2904     (gnus-summary-mark-as-expirable
2905      "delete" nil
2906      :visible (gnus-check-backend-function 'request-expire-articles
2907                                            gnus-newsgroup-name))
2908     (gnus-summary-mark-as-spam
2909      "mail/spam" t
2910      :visible (and (fboundp 'spam-group-ham-contents-p)
2911                    (spam-group-ham-contents-p gnus-newsgroup-name))
2912      :help "Mark as spam")
2913     (gnus-summary-mark-as-read-forward
2914      "mail/not-spam" nil
2915      :visible (and (fboundp 'spam-group-spam-contents-p)
2916                    (spam-group-spam-contents-p gnus-newsgroup-name)))
2917     ;;
2918     (gnus-summary-exit "exit")
2919     (gmm-customize-mode "preferences" t :help "Edit mode preferences")
2920     (gnus-info-find-node "help"))
2921   "List of functions for the summary tool bar (GNOME style).
2922
2923 See `gmm-tool-bar-from-list' for the format of the list."
2924   :type '(repeat gmm-tool-bar-item)
2925   :version "23.1" ;; No Gnus
2926   :initialize 'custom-initialize-default
2927   :set 'gnus-summary-tool-bar-update
2928   :group 'gnus-summary)
2929
2930 (defcustom gnus-summary-tool-bar-retro
2931   '((gnus-summary-prev-unread-article "gnus/prev-ur")
2932     (gnus-summary-next-unread-article "gnus/next-ur")
2933     (gnus-summary-post-news "gnus/post")
2934     (gnus-summary-followup-with-original "gnus/fuwo")
2935     (gnus-summary-followup "gnus/followup")
2936     (gnus-summary-reply-with-original "gnus/reply-wo")
2937     (gnus-summary-reply "gnus/reply")
2938     (gnus-summary-caesar-message "gnus/rot13")
2939     (gnus-uu-decode-uu "gnus/uu-decode")
2940     (gnus-summary-save-article-file "gnus/save-aif")
2941     (gnus-summary-save-article "gnus/save-art")
2942     (gnus-uu-post-news "gnus/uu-post")
2943     (gnus-summary-catchup "gnus/catchup")
2944     (gnus-summary-catchup-and-exit "gnus/cu-exit")
2945     (gnus-summary-exit "gnus/exit-summ")
2946     ;; Some new command that may need more suitable icons:
2947     (gnus-summary-print-article "gnus/print" nil :visible nil)
2948     (gnus-summary-mark-as-expirable "gnus/close" nil :visible nil)
2949     (gnus-summary-save-newsrc "gnus/save" nil :visible nil)
2950     ;; (gnus-summary-enter-digest-group "gnus/right_arrow" nil :visible nil)
2951     (gnus-summary-search-article-forward "gnus/search" nil :visible nil)
2952     ;; (gnus-summary-insert-new-articles "gnus/paste" nil :visible nil)
2953     ;; (gnus-summary-toggle-threads "gnus/open" nil :visible nil)
2954     ;;
2955     (gnus-info-find-node "gnus/help" nil :visible nil))
2956   "List of functions for the summary tool bar (retro look).
2957
2958 See `gmm-tool-bar-from-list' for the format of the list."
2959   :type '(repeat gmm-tool-bar-item)
2960   :version "23.1" ;; No Gnus
2961   :initialize 'custom-initialize-default
2962   :set 'gnus-summary-tool-bar-update
2963   :group 'gnus-summary)
2964
2965 (defcustom gnus-summary-tool-bar-zap-list t
2966   "List of icon items from the global tool bar.
2967 These items are not displayed in the Gnus summary mode tool bar.
2968
2969 See `gmm-tool-bar-from-list' for the format of the list."
2970   :type 'gmm-tool-bar-zap-list
2971   :version "23.1" ;; No Gnus
2972   :initialize 'custom-initialize-default
2973   :set 'gnus-summary-tool-bar-update
2974   :group 'gnus-summary)
2975
2976 (defvar image-load-path)
2977 (defvar tool-bar-map)
2978
2979 (defun gnus-summary-make-tool-bar (&optional force)
2980   "Make a summary mode tool bar from `gnus-summary-tool-bar'.
2981 When FORCE, rebuild the tool bar."
2982   (when (and (not (featurep 'xemacs))
2983              (boundp 'tool-bar-mode)
2984              tool-bar-mode
2985              (or (not gnus-summary-tool-bar-map) force))
2986     (let* ((load-path
2987             (gmm-image-load-path-for-library "gnus"
2988                                              "mail/save.xpm"
2989                                              nil t))
2990            (image-load-path (cons (car load-path)
2991                                   (when (boundp 'image-load-path)
2992                                     image-load-path)))
2993            (map (gmm-tool-bar-from-list gnus-summary-tool-bar
2994                                         gnus-summary-tool-bar-zap-list
2995                                         'gnus-summary-mode-map)))
2996       (when map
2997         ;; Need to set `gnus-summary-tool-bar-map' because `gnus-article-mode'
2998         ;; uses its value.
2999         (setq gnus-summary-tool-bar-map map))))
3000   (set (make-local-variable 'tool-bar-map) gnus-summary-tool-bar-map))
3001
3002 (defun gnus-make-score-map (type)
3003   "Make a summary score map of type TYPE."
3004   (if t
3005       nil
3006     (let ((headers '(("author" "from" string)
3007                      ("subject" "subject" string)
3008                      ("article body" "body" string)
3009                      ("article head" "head" string)
3010                      ("xref" "xref" string)
3011                      ("extra header" "extra" string)
3012                      ("lines" "lines" number)
3013                      ("followups to author" "followup" string)))
3014           (types '((number ("less than" <)
3015                            ("greater than" >)
3016                            ("equal" =))
3017                    (string ("substring" s)
3018                            ("exact string" e)
3019                            ("fuzzy string" f)
3020                            ("regexp" r))))
3021           (perms '(("temporary" (current-time-string))
3022                    ("permanent" nil)
3023                    ("immediate" now)))
3024           header)
3025       (list
3026        (apply
3027         'nconc
3028         (list
3029          (if (eq type 'lower)
3030              "Lower score"
3031            "Increase score"))
3032         (let (outh)
3033           (while headers
3034             (setq header (car headers))
3035             (setq outh
3036                   (cons
3037                    (apply
3038                     'nconc
3039                     (list (car header))
3040                     (let ((ts (cdr (assoc (nth 2 header) types)))
3041                           outt)
3042                       (while ts
3043                         (setq outt
3044                               (cons
3045                                (apply
3046                                 'nconc
3047                                 (list (caar ts))
3048                                 (let ((ps perms)
3049                                       outp)
3050                                   (while ps
3051                                     (setq outp
3052                                           (cons
3053                                            (vector
3054                                             (caar ps)
3055                                             (list
3056                                              'gnus-summary-score-entry
3057                                              (nth 1 header)
3058                                              (if (or (string= (nth 1 header)
3059                                                               "head")
3060                                                      (string= (nth 1 header)
3061                                                               "body"))
3062                                                  ""
3063                                                (list 'gnus-summary-header
3064                                                      (nth 1 header)))
3065                                              (list 'quote (nth 1 (car ts)))
3066                                              (list 'gnus-score-delta-default
3067                                                    nil)
3068                                              (nth 1 (car ps))
3069                                              t)
3070                                             t)
3071                                            outp))
3072                                     (setq ps (cdr ps)))
3073                                   (list (nreverse outp))))
3074                                outt))
3075                         (setq ts (cdr ts)))
3076                       (list (nreverse outt))))
3077                    outh))
3078             (setq headers (cdr headers)))
3079           (list (nreverse outh))))))))
3080
3081
3082 (declare-function turn-on-gnus-mailing-list-mode "gnus-ml" ())
3083 (defvar bookmark-make-record-function)
3084 \f
3085 (defvar bidi-paragraph-direction)
3086
3087 (defun gnus-summary-mode (&optional group)
3088   "Major mode for reading articles.
3089
3090 All normal editing commands are switched off.
3091 \\<gnus-summary-mode-map>
3092 Each line in this buffer represents one article.  To read an
3093 article, you can, for instance, type `\\[gnus-summary-next-page]'.  To move forwards
3094 and backwards while displaying articles, type `\\[gnus-summary-next-unread-article]' and `\\[gnus-summary-prev-unread-article]',
3095 respectively.
3096
3097 You can also post articles and send mail from this buffer.  To
3098 follow up an article, type `\\[gnus-summary-followup]'.  To mail a reply to the author
3099 of an article, type `\\[gnus-summary-reply]'.
3100
3101 There are approx. one gazillion commands you can execute in this
3102 buffer; read the info pages for more information (`\\[gnus-info-find-node]').
3103
3104 The following commands are available:
3105
3106 \\{gnus-summary-mode-map}"
3107   ;; FIXME: Use define-derived-mode.
3108   (interactive)
3109   (kill-all-local-variables)
3110   (let ((gnus-summary-local-variables gnus-newsgroup-variables))
3111     (gnus-summary-make-local-variables))
3112   (gnus-summary-make-local-variables)
3113   (setq gnus-newsgroup-name group)
3114   (when (gnus-visual-p 'summary-menu 'menu)
3115     (gnus-summary-make-menu-bar)
3116     (gnus-summary-make-tool-bar))
3117   (gnus-make-thread-indent-array)
3118   (gnus-simplify-mode-line)
3119   (setq major-mode 'gnus-summary-mode)
3120   (setq mode-name "Summary")
3121   (use-local-map gnus-summary-mode-map)
3122   (buffer-disable-undo)
3123   (setq buffer-read-only t              ;Disable modification
3124         show-trailing-whitespace nil)
3125   (setq truncate-lines t)
3126   ;; Force paragraph direction to be left-to-right.  Don't make it
3127   ;; bound globally in old Emacsen and XEmacsen.
3128   (set (make-local-variable 'bidi-paragraph-direction) 'left-to-right)
3129   (add-to-invisibility-spec '(gnus-sum . t))
3130   (gnus-summary-set-display-table)
3131   (gnus-set-default-directory)
3132   (make-local-variable 'gnus-summary-line-format)
3133   (make-local-variable 'gnus-summary-line-format-spec)
3134   (make-local-variable 'gnus-summary-dummy-line-format)
3135   (make-local-variable 'gnus-summary-dummy-line-format-spec)
3136   (make-local-variable 'gnus-summary-mark-positions)
3137   (gnus-make-local-hook 'pre-command-hook)
3138   (add-hook 'pre-command-hook 'gnus-set-global-variables nil t)
3139   (gnus-run-mode-hooks 'gnus-summary-mode-hook)
3140   (turn-on-gnus-mailing-list-mode)
3141   (mm-enable-multibyte)
3142   (set (make-local-variable 'bookmark-make-record-function)
3143        'gnus-summary-bookmark-make-record)
3144   (gnus-update-format-specifications nil 'summary 'summary-mode 'summary-dummy)
3145   (gnus-update-summary-mark-positions))
3146
3147 (defun gnus-summary-make-local-variables ()
3148   "Make all the local summary buffer variables."
3149   (let (global)
3150     (dolist (local gnus-summary-local-variables)
3151       (if (consp local)
3152           (progn
3153             (if (eq (cdr local) 'global)
3154                 ;; Copy the global value of the variable.
3155                 (setq global (symbol-value (car local)))
3156               ;; Use the value from the list.
3157               (setq global (eval (cdr local))))
3158             (set (make-local-variable (car local)) global))
3159         ;; Simple nil-valued local variable.
3160         (set (make-local-variable local) nil)))))
3161
3162 ;; Summary data functions.
3163
3164 (defmacro gnus-data-number (data)
3165   `(car ,data))
3166
3167 (defmacro gnus-data-set-number (data number)
3168   `(setcar ,data ,number))
3169
3170 (defmacro gnus-data-mark (data)
3171   `(nth 1 ,data))
3172
3173 (defmacro gnus-data-set-mark (data mark)
3174   `(setcar (nthcdr 1 ,data) ,mark))
3175
3176 (defmacro gnus-data-pos (data)
3177   `(nth 2 ,data))
3178
3179 (defmacro gnus-data-set-pos (data pos)
3180   `(setcar (nthcdr 2 ,data) ,pos))
3181
3182 (defmacro gnus-data-header (data)
3183   `(nth 3 ,data))
3184
3185 (defmacro gnus-data-set-header (data header)
3186   `(setf (nth 3 ,data) ,header))
3187
3188 (defmacro gnus-data-level (data)
3189   `(nth 4 ,data))
3190
3191 (defmacro gnus-data-unread-p (data)
3192   `(= (nth 1 ,data) gnus-unread-mark))
3193
3194 (defmacro gnus-data-read-p (data)
3195   `(/= (nth 1 ,data) gnus-unread-mark))
3196
3197 (defmacro gnus-data-pseudo-p (data)
3198   `(consp (nth 3 ,data)))
3199
3200 (defmacro gnus-data-find (number)
3201   `(assq ,number gnus-newsgroup-data))
3202
3203 (defmacro gnus-data-find-list (number &optional data)
3204   `(let ((bdata ,(or data 'gnus-newsgroup-data)))
3205      (memq (assq ,number bdata)
3206            bdata)))
3207
3208 (defmacro gnus-data-make (number mark pos header level)
3209   `(list ,number ,mark ,pos ,header ,level))
3210
3211 (defun gnus-data-enter (after-article number mark pos header level offset)
3212   (let ((data (gnus-data-find-list after-article)))
3213     (unless data
3214       (error "No such article: %d" after-article))
3215     (setcdr data (cons (gnus-data-make number mark pos header level)
3216                        (cdr data)))
3217     (setq gnus-newsgroup-data-reverse nil)
3218     (gnus-data-update-list (cddr data) offset)))
3219
3220 (defun gnus-data-enter-list (after-article list &optional offset)
3221   (when list
3222     (let ((data (and after-article (gnus-data-find-list after-article)))
3223           (ilist list))
3224       (if (not (or data
3225                    after-article))
3226           (let ((odata gnus-newsgroup-data))
3227             (setq gnus-newsgroup-data (nconc list gnus-newsgroup-data))
3228             (when offset
3229               (gnus-data-update-list odata offset)))
3230         ;; Find the last element in the list to be spliced into the main
3231         ;; list.
3232         (setq list (last list))
3233         (if (not data)
3234             (progn
3235               (setcdr list gnus-newsgroup-data)
3236               (setq gnus-newsgroup-data ilist)
3237               (when offset
3238                 (gnus-data-update-list (cdr list) offset)))
3239           (setcdr list (cdr data))
3240           (setcdr data ilist)
3241           (when offset
3242             (gnus-data-update-list (cdr list) offset))))
3243       (setq gnus-newsgroup-data-reverse nil))))
3244
3245 (defun gnus-data-remove (article &optional offset)
3246   (let ((data gnus-newsgroup-data))
3247     (if (= (gnus-data-number (car data)) article)
3248         (progn
3249           (setq gnus-newsgroup-data (cdr gnus-newsgroup-data)
3250                 gnus-newsgroup-data-reverse nil)
3251           (when offset
3252             (gnus-data-update-list gnus-newsgroup-data offset)))
3253       (while (cdr data)
3254         (when (= (gnus-data-number (cadr data)) article)
3255           (setcdr data (cddr data))
3256           (when offset
3257             (gnus-data-update-list (cdr data) offset))
3258           (setq data nil
3259                 gnus-newsgroup-data-reverse nil))
3260         (setq data (cdr data))))))
3261
3262 (defmacro gnus-data-list (backward)
3263   `(if ,backward
3264        (or gnus-newsgroup-data-reverse
3265            (setq gnus-newsgroup-data-reverse
3266                  (reverse gnus-newsgroup-data)))
3267      gnus-newsgroup-data))
3268
3269 (defun gnus-data-update-list (data offset)
3270   "Add OFFSET to the POS of all data entries in DATA."
3271   (setq gnus-newsgroup-data-reverse nil)
3272   (while data
3273     (setcar (nthcdr 2 (car data)) (+ offset (nth 2 (car data))))
3274     (setq data (cdr data))))
3275
3276 (defun gnus-summary-article-pseudo-p (article)
3277   "Say whether this article is a pseudo article or not."
3278   (not (vectorp (gnus-data-header (gnus-data-find article)))))
3279
3280 (defmacro gnus-summary-article-sparse-p (article)
3281   "Say whether this article is a sparse article or not."
3282   `(memq ,article gnus-newsgroup-sparse))
3283
3284 (defmacro gnus-summary-article-ancient-p (article)
3285   "Say whether this article is a sparse article or not."
3286   `(memq ,article gnus-newsgroup-ancient))
3287
3288 (defun gnus-article-children (number)
3289   "Return a list of all children to NUMBER."
3290   (let* ((data (gnus-data-find-list number))
3291          (level (gnus-data-level (car data)))
3292          children)
3293     (setq data (cdr data))
3294     (while (and data
3295                 (= (gnus-data-level (car data)) (1+ level)))
3296       (push (gnus-data-number (car data)) children)
3297       (setq data (cdr data)))
3298     children))
3299
3300 (defmacro gnus-summary-skip-intangible ()
3301   "If the current article is intangible, then jump to a different article."
3302   '(let ((to (get-text-property (point) 'gnus-intangible)))
3303      (and to (gnus-summary-goto-subject to))))
3304
3305 (defmacro gnus-summary-article-intangible-p ()
3306   "Say whether this article is intangible or not."
3307   '(get-text-property (point) 'gnus-intangible))
3308
3309 ;; Some summary mode macros.
3310
3311 (defmacro gnus-summary-article-number ()
3312   "The article number of the article on the current line.
3313 If there isn't an article number here, then we return the current
3314 article number."
3315   '(progn
3316      (gnus-summary-skip-intangible)
3317      (or (get-text-property (point) 'gnus-number)
3318          (gnus-summary-last-subject))))
3319
3320 (defmacro gnus-summary-article-header (&optional number)
3321   "Return the header of article NUMBER."
3322   `(gnus-data-header (gnus-data-find
3323                       ,(or number '(gnus-summary-article-number)))))
3324
3325 (defmacro gnus-summary-thread-level (&optional number)
3326   "Return the level of thread that starts with article NUMBER."
3327   `(if (and (eq gnus-summary-make-false-root 'dummy)
3328             (get-text-property (point) 'gnus-intangible))
3329        0
3330      (gnus-data-level (gnus-data-find
3331                        ,(or number '(gnus-summary-article-number))))))
3332
3333 (defmacro gnus-summary-article-mark (&optional number)
3334   "Return the mark of article NUMBER."
3335   `(gnus-data-mark (gnus-data-find
3336                     ,(or number '(gnus-summary-article-number)))))
3337
3338 (defmacro gnus-summary-article-pos (&optional number)
3339   "Return the position of the line of article NUMBER."
3340   `(gnus-data-pos (gnus-data-find
3341                    ,(or number '(gnus-summary-article-number)))))
3342
3343 (defalias 'gnus-summary-subject-string 'gnus-summary-article-subject)
3344 (defmacro gnus-summary-article-subject (&optional number)
3345   "Return current subject string or nil if nothing."
3346   `(let ((headers
3347           ,(if number
3348                `(gnus-data-header (assq ,number gnus-newsgroup-data))
3349              '(gnus-data-header (assq (gnus-summary-article-number)
3350                                       gnus-newsgroup-data)))))
3351      (and headers
3352           (vectorp headers)
3353           (mail-header-subject headers))))
3354
3355 (defmacro gnus-summary-article-score (&optional number)
3356   "Return current article score."
3357   `(or (cdr (assq ,(or number '(gnus-summary-article-number))
3358                   gnus-newsgroup-scored))
3359        gnus-summary-default-score 0))
3360
3361 (defun gnus-summary-article-children (&optional number)
3362   "Return a list of article numbers that are children of article NUMBER."
3363   (let* ((data (gnus-data-find-list (or number (gnus-summary-article-number))))
3364          (level (gnus-data-level (car data)))
3365          l children)
3366     (while (and (setq data (cdr data))
3367                 (> (setq l (gnus-data-level (car data))) level))
3368       (and (= (1+ level) l)
3369            (push (gnus-data-number (car data))
3370                  children)))
3371     (nreverse children)))
3372
3373 (defun gnus-summary-article-parent (&optional number)
3374   "Return the article number of the parent of article NUMBER."
3375   (let* ((data (gnus-data-find-list (or number (gnus-summary-article-number))
3376                                     (gnus-data-list t)))
3377          (level (gnus-data-level (car data))))
3378     (if (zerop level)
3379         ()                              ; This is a root.
3380       ;; We search until we find an article with a level less than
3381       ;; this one.  That function has to be the parent.
3382       (while (and (setq data (cdr data))
3383                   (not (< (gnus-data-level (car data)) level))))
3384       (and data (gnus-data-number (car data))))))
3385
3386 (defun gnus-unread-mark-p (mark)
3387   "Say whether MARK is the unread mark."
3388   (= mark gnus-unread-mark))
3389
3390 (defun gnus-read-mark-p (mark)
3391   "Say whether MARK is one of the marks that mark as read.
3392 This is all marks except unread, ticked, dormant, and expirable."
3393   (not (or (= mark gnus-unread-mark)
3394            (= mark gnus-ticked-mark)
3395            (= mark gnus-spam-mark)
3396            (= mark gnus-dormant-mark)
3397            (= mark gnus-expirable-mark))))
3398
3399 (defmacro gnus-article-mark (number)
3400   "Return the MARK of article NUMBER.
3401 This macro should only be used when computing the mark the \"first\"
3402 time; i.e., when generating the summary lines.  After that,
3403 `gnus-summary-article-mark' should be used to examine the
3404 marks of articles."
3405   `(cond
3406     ((memq ,number gnus-newsgroup-unsendable) gnus-unsendable-mark)
3407     ((memq ,number gnus-newsgroup-downloadable) gnus-downloadable-mark)
3408     ((memq ,number gnus-newsgroup-unreads) gnus-unread-mark)
3409     ((memq ,number gnus-newsgroup-marked) gnus-ticked-mark)
3410     ((memq ,number gnus-newsgroup-spam-marked) gnus-spam-mark)
3411     ((memq ,number gnus-newsgroup-dormant) gnus-dormant-mark)
3412     ((memq ,number gnus-newsgroup-expirable) gnus-expirable-mark)
3413     (t (or (cdr (assq ,number gnus-newsgroup-reads))
3414            gnus-ancient-mark))))
3415
3416 ;; Saving hidden threads.
3417
3418 (defmacro gnus-save-hidden-threads (&rest forms)
3419   "Save hidden threads, eval FORMS, and restore the hidden threads."
3420   (let ((config (make-symbol "config")))
3421     `(let ((,config (gnus-hidden-threads-configuration)))
3422        (unwind-protect
3423            (save-excursion
3424              ,@forms)
3425          (gnus-restore-hidden-threads-configuration ,config)))))
3426 (put 'gnus-save-hidden-threads 'lisp-indent-function 0)
3427 (put 'gnus-save-hidden-threads 'edebug-form-spec '(body))
3428
3429 (defun gnus-data-compute-positions ()
3430   "Compute the positions of all articles."
3431   (setq gnus-newsgroup-data-reverse nil)
3432   (let ((data gnus-newsgroup-data))
3433     (save-excursion
3434       (gnus-save-hidden-threads
3435         (gnus-summary-show-all-threads)
3436         (goto-char (point-min))
3437         (while data
3438           (while (get-text-property (point) 'gnus-intangible)
3439             (forward-line 1))
3440           (gnus-data-set-pos (car data) (+ (point) 3))
3441           (setq data (cdr data))
3442           (forward-line 1))))))
3443
3444 (defun gnus-hidden-threads-configuration ()
3445   "Return the current hidden threads configuration."
3446   (save-excursion
3447     (let (config)
3448       (goto-char (point-min))
3449       (while (not (eobp))
3450         (when (eq (get-char-property (point-at-eol) 'invisible) 'gnus-sum)
3451           (push (save-excursion (forward-line 0) (point)) config))
3452         (forward-line 1))
3453       config)))
3454
3455 (defun gnus-restore-hidden-threads-configuration (config)
3456   "Restore hidden threads configuration from CONFIG."
3457   (save-excursion
3458     (let (point (inhibit-read-only t))
3459       (while (setq point (pop config))
3460         (goto-char point)
3461         (gnus-summary-hide-thread)))))
3462
3463 ;; Various summary mode internalish functions.
3464
3465 (defun gnus-mouse-pick-article (e)
3466   (interactive "e")
3467   (mouse-set-point e)
3468   (gnus-summary-next-page nil t))
3469
3470 (defun gnus-summary-set-display-table ()
3471   "Change the display table.
3472 Odd characters have a tendency to mess
3473 up nicely formatted displays - we make all possible glyphs
3474 display only a single character."
3475
3476   ;; We start from the standard display table, if any.
3477   (let ((table (or (copy-sequence standard-display-table)
3478                    (make-display-table)))
3479         (i 32))
3480     ;; Nix out all the control chars...
3481     (while (>= (setq i (1- i)) 0)
3482       (gnus-put-display-table i [??] table))
3483    ;; ... but not newline and cr, of course.  (cr is necessary for the
3484     ;; selective display).
3485     (gnus-put-display-table ?\n nil table)
3486     (gnus-put-display-table ?\r nil table)
3487     ;; We keep TAB as well.
3488     (gnus-put-display-table ?\t nil table)
3489     ;; We nix out any glyphs 127 through 255, or 127 through 159 in
3490     ;; Emacs 23 (unicode), that are not set already.
3491     (let ((i (if (ignore-errors (= (make-char 'latin-iso8859-1 160) 160))
3492                  160
3493                256)))
3494       (while (>= (setq i (1- i)) 127)
3495         ;; Only modify if the entry is nil.
3496         (unless (gnus-get-display-table i table)
3497           (gnus-put-display-table i [??] table))))
3498     (setq buffer-display-table table)))
3499
3500 (defun gnus-summary-set-article-display-arrow (pos)
3501   "Update the overlay arrow to point to line at position POS."
3502   (when gnus-summary-display-arrow
3503     (make-local-variable 'overlay-arrow-position)
3504     (make-local-variable 'overlay-arrow-string)
3505     (save-excursion
3506       (goto-char pos)
3507       (beginning-of-line)
3508       (unless overlay-arrow-position
3509         (setq overlay-arrow-position (make-marker)))
3510       (setq overlay-arrow-string "=>"
3511             overlay-arrow-position (set-marker overlay-arrow-position
3512                                                (point)
3513                                                (current-buffer))))))
3514
3515 (defun gnus-summary-setup-buffer (group)
3516   "Initialize summary buffer.
3517 If the setup was successful, non-nil is returned."
3518   (let ((buffer (gnus-summary-buffer-name group))
3519         (dead-name (concat "*Dead Summary "
3520                            (gnus-group-decoded-name group) "*")))
3521     ;; If a dead summary buffer exists, we kill it.
3522     (when (gnus-buffer-live-p dead-name)
3523       (gnus-kill-buffer dead-name))
3524     (if (get-buffer buffer)
3525         (progn
3526           (set-buffer buffer)
3527           (setq gnus-summary-buffer (current-buffer))
3528           (not gnus-newsgroup-prepared))
3529       (set-buffer (gnus-get-buffer-create buffer))
3530       (setq gnus-summary-buffer (current-buffer))
3531       (gnus-summary-mode group)
3532       (when (gnus-group-quit-config group)
3533         (set (make-local-variable 'gnus-single-article-buffer) nil))
3534       (make-local-variable 'gnus-article-buffer)
3535       (make-local-variable 'gnus-article-current)
3536       (make-local-variable 'gnus-original-article-buffer)
3537       (setq gnus-newsgroup-name group)
3538       ;; Set any local variables in the group parameters.
3539       (gnus-summary-set-local-parameters gnus-newsgroup-name)
3540       t)))
3541
3542 (defun gnus-set-global-variables ()
3543   "Set the global equivalents of the buffer-local variables.
3544 They are set to the latest values they had.  These reflect the summary
3545 buffer that was in action when the last article was fetched."
3546   (when (derived-mode-p 'gnus-summary-mode)
3547     (setq gnus-summary-buffer (current-buffer))
3548     (let ((name gnus-newsgroup-name)
3549           (marked gnus-newsgroup-marked)
3550           (spam gnus-newsgroup-spam-marked)
3551           (unread gnus-newsgroup-unreads)
3552           (headers gnus-current-headers)
3553           (data gnus-newsgroup-data)
3554           (summary gnus-summary-buffer)
3555           (article-buffer gnus-article-buffer)
3556           (original gnus-original-article-buffer)
3557           (gac gnus-article-current)
3558           (reffed gnus-reffed-article-number)
3559           (score-file gnus-current-score-file)
3560           (default-charset gnus-newsgroup-charset)
3561           vlist)
3562       (let ((locals gnus-newsgroup-variables))
3563         (while locals
3564           (if (consp (car locals))
3565               (push (eval (caar locals)) vlist)
3566             (push (eval (car locals)) vlist))
3567           (setq locals (cdr locals)))
3568         (setq vlist (nreverse vlist)))
3569       (with-temp-buffer
3570         (setq gnus-newsgroup-name name
3571               gnus-newsgroup-marked marked
3572               gnus-newsgroup-spam-marked spam
3573               gnus-newsgroup-unreads unread
3574               gnus-current-headers headers
3575               gnus-newsgroup-data data
3576               gnus-article-current gac
3577               gnus-summary-buffer summary
3578               gnus-article-buffer article-buffer
3579               gnus-original-article-buffer original
3580               gnus-reffed-article-number reffed
3581               gnus-current-score-file score-file
3582               gnus-newsgroup-charset default-charset)
3583         (let ((locals gnus-newsgroup-variables))
3584           (while locals
3585             (if (consp (car locals))
3586                 (set (caar locals) (pop vlist))
3587               (set (car locals) (pop vlist)))
3588             (setq locals (cdr locals))))))))
3589
3590 (defun gnus-summary-article-unread-p (article)
3591   "Say whether ARTICLE is unread or not."
3592   (memq article gnus-newsgroup-unreads))
3593
3594 (defun gnus-summary-first-article-p (&optional article)
3595   "Return whether ARTICLE is the first article in the buffer."
3596   (if (not (setq article (or article (gnus-summary-article-number))))
3597       nil
3598     (eq article (caar gnus-newsgroup-data))))
3599
3600 (defun gnus-summary-last-article-p (&optional article)
3601   "Return whether ARTICLE is the last article in the buffer."
3602   (if (not (setq article (or article (gnus-summary-article-number))))
3603       ;; All non-existent numbers are the last article.  :-)
3604       t
3605     (not (cdr (gnus-data-find-list article)))))
3606
3607 (defun gnus-make-thread-indent-array (&optional n)
3608   (when (or n
3609             (progn (setq n 200) nil)
3610             (null gnus-thread-indent-array)
3611             (/= gnus-thread-indent-level gnus-thread-indent-array-level))
3612     (setq gnus-thread-indent-array (make-vector (1+ n) "")
3613           gnus-thread-indent-array-level gnus-thread-indent-level)
3614     (while (>= n 0)
3615       (aset gnus-thread-indent-array n
3616             (make-string (* n gnus-thread-indent-level) ? ))
3617       (setq n (1- n)))))
3618
3619 (defun gnus-update-summary-mark-positions ()
3620   "Compute where the summary marks are to go."
3621   (save-excursion
3622     (when (gnus-buffer-exists-p gnus-summary-buffer)
3623       (set-buffer gnus-summary-buffer))
3624     (let ((spec gnus-summary-line-format-spec)
3625           pos)
3626       (save-excursion
3627         (gnus-set-work-buffer)
3628         (let ((gnus-tmp-unread ?Z)
3629               (gnus-replied-mark ?Z)
3630               (gnus-score-below-mark ?Z)
3631               (gnus-score-over-mark ?Z)
3632               (gnus-undownloaded-mark ?Z)
3633               (gnus-summary-line-format-spec spec)
3634               (gnus-newsgroup-downloadable '(0))
3635               (header [0 "" "" "05 Apr 2001 23:33:09 +0400" "" "" 0 0 "" nil])
3636               case-fold-search ignores)
3637           ;; Here, all marks are bound to Z.
3638           (gnus-summary-insert-line header
3639                                     0 nil t gnus-tmp-unread t nil "" nil 1)
3640           (goto-char (point-min))
3641           ;; Memorize the positions of the same characters as dummy marks.
3642           (while (re-search-forward "[A-D]" nil t)
3643             (push (point) ignores))
3644           (erase-buffer)
3645           ;; We use A-D as dummy marks in order to know column positions
3646           ;; where marks should be inserted.
3647           (setq gnus-tmp-unread ?A
3648                 gnus-replied-mark ?B
3649                 gnus-score-below-mark ?C
3650                 gnus-score-over-mark ?C
3651                 gnus-undownloaded-mark ?D)
3652           (gnus-summary-insert-line header
3653                                     0 nil t gnus-tmp-unread t nil "" nil 1)
3654           ;; Ignore characters which aren't dummy marks.
3655           (dolist (p ignores)
3656             (delete-region (goto-char (1- p)) p)
3657             (insert ?Z))
3658           (goto-char (point-min))
3659           (setq pos (list (cons 'unread
3660                                 (and (search-forward "A" nil t)
3661                                      (- (point) (point-min) 1)))))
3662           (goto-char (point-min))
3663           (push (cons 'replied (and (search-forward "B" nil t)
3664                                     (- (point) (point-min) 1)))
3665                 pos)
3666           (goto-char (point-min))
3667           (push (cons 'score (and (search-forward "C" nil t)
3668                                   (- (point) (point-min) 1)))
3669                 pos)
3670           (goto-char (point-min))
3671           (push (cons 'download (and (search-forward "D" nil t)
3672                                      (- (point) (point-min) 1)))
3673                 pos)))
3674       (setq gnus-summary-mark-positions pos))))
3675
3676 (defun gnus-summary-insert-dummy-line (gnus-tmp-subject gnus-tmp-number)
3677   "Insert a dummy root in the summary buffer."
3678   (beginning-of-line)
3679   (gnus-add-text-properties
3680    (point) (progn (eval gnus-summary-dummy-line-format-spec) (point))
3681    (list 'gnus-number gnus-tmp-number 'gnus-intangible gnus-tmp-number)))
3682
3683 (defun gnus-summary-extract-address-component (from)
3684   (or (car (funcall gnus-extract-address-components from))
3685       from))
3686
3687 (defun gnus-summary-from-or-to-or-newsgroups (header gnus-tmp-from)
3688   (let ((mail-parse-charset gnus-newsgroup-charset)
3689         (ignored-from-addresses (gnus-ignored-from-addresses))
3690         ;; Is it really necessary to do this next part for each summary line?
3691         ;; Luckily, doesn't seem to slow things down much.
3692         (mail-parse-ignored-charsets
3693          (with-current-buffer gnus-summary-buffer
3694            gnus-newsgroup-ignored-charsets)))
3695     (or
3696      (and ignored-from-addresses
3697           (string-match ignored-from-addresses gnus-tmp-from)
3698           (let ((extra-headers (mail-header-extra header))
3699                 to
3700                 newsgroups)
3701             (cond
3702              ((setq to (cdr (assq 'To extra-headers)))
3703               (concat gnus-summary-to-prefix
3704                       (inline
3705                         (gnus-summary-extract-address-component
3706                          (funcall gnus-decode-encoded-address-function to)))))
3707              ((setq newsgroups
3708                     (or
3709                      (cdr (assq 'Newsgroups extra-headers))
3710                      (and
3711                       (memq 'Newsgroups gnus-extra-headers)
3712                       (eq (car (gnus-find-method-for-group
3713                                 gnus-newsgroup-name)) 'nntp)
3714                       (gnus-group-real-name gnus-newsgroup-name))))
3715               (concat gnus-summary-newsgroup-prefix newsgroups)))))
3716      (gnus-string-mark-left-to-right
3717       (inline
3718         (gnus-summary-extract-address-component gnus-tmp-from))))))
3719
3720 (defun gnus-summary-insert-line (gnus-tmp-header
3721                                  gnus-tmp-level gnus-tmp-current
3722                                  undownloaded gnus-tmp-unread gnus-tmp-replied
3723                                  gnus-tmp-expirable gnus-tmp-subject-or-nil
3724                                  &optional gnus-tmp-dummy gnus-tmp-score
3725                                  gnus-tmp-process)
3726   (if (>= gnus-tmp-level (length gnus-thread-indent-array))
3727       (gnus-make-thread-indent-array (max (* 2 (length gnus-thread-indent-array))
3728                                           gnus-tmp-level)))
3729   (let* ((gnus-tmp-indentation (aref gnus-thread-indent-array gnus-tmp-level))
3730          (gnus-tmp-lines (mail-header-lines gnus-tmp-header))
3731          (gnus-tmp-score (or gnus-tmp-score gnus-summary-default-score 0))
3732          (gnus-tmp-score-char
3733           (if (or (null gnus-summary-default-score)
3734                   (<= (abs (- gnus-tmp-score gnus-summary-default-score))
3735                       gnus-summary-zcore-fuzz))
3736               ?                         ;Whitespace
3737             (if (< gnus-tmp-score gnus-summary-default-score)
3738                 gnus-score-below-mark gnus-score-over-mark)))
3739          (gnus-tmp-number (mail-header-number gnus-tmp-header))
3740          (gnus-tmp-replied
3741           (cond (gnus-tmp-process gnus-process-mark)
3742                 ((memq gnus-tmp-current gnus-newsgroup-cached)
3743                  gnus-cached-mark)
3744                 (gnus-tmp-replied gnus-replied-mark)
3745                 ((memq gnus-tmp-current gnus-newsgroup-forwarded)
3746                  gnus-forwarded-mark)
3747                 ((memq gnus-tmp-current gnus-newsgroup-saved)
3748                  gnus-saved-mark)
3749                 ((memq gnus-tmp-number gnus-newsgroup-unseen)
3750                  gnus-unseen-mark)
3751                 (t gnus-no-mark)))
3752          (gnus-tmp-downloaded
3753           (cond (undownloaded
3754                  gnus-undownloaded-mark)
3755                 (gnus-newsgroup-agentized
3756                  gnus-downloaded-mark)
3757                 (t
3758                  gnus-no-mark)))
3759          (gnus-tmp-from (mail-header-from gnus-tmp-header))
3760          (gnus-tmp-name
3761           (cond
3762            ((string-match "<[^>]+> *$" gnus-tmp-from)
3763             (let ((beg (match-beginning 0)))
3764               (or (and (string-match "^\".+\"" gnus-tmp-from)
3765                        (substring gnus-tmp-from 1 (1- (match-end 0))))
3766                   (substring gnus-tmp-from 0 beg))))
3767            ((string-match "(.+)" gnus-tmp-from)
3768             (substring gnus-tmp-from
3769                        (1+ (match-beginning 0)) (1- (match-end 0))))
3770            (t gnus-tmp-from)))
3771          (gnus-tmp-subject (mail-header-subject gnus-tmp-header))
3772          (gnus-tmp-opening-bracket (if gnus-tmp-dummy ?\< ?\[))
3773          (gnus-tmp-closing-bracket (if gnus-tmp-dummy ?\> ?\]))
3774          (inhibit-read-only t))
3775     (when (string= gnus-tmp-name "")
3776       (setq gnus-tmp-name gnus-tmp-from))
3777     (unless (numberp gnus-tmp-lines)
3778       (setq gnus-tmp-lines -1))
3779     (if (= gnus-tmp-lines -1)
3780         (setq gnus-tmp-lines "?")
3781       (setq gnus-tmp-lines (number-to-string gnus-tmp-lines)))
3782     (condition-case ()
3783         (gnus-put-text-property
3784          (point)
3785          (progn (eval gnus-summary-line-format-spec) (point))
3786          'gnus-number gnus-tmp-number)
3787       (error (gnus-message 5 "Error updating the summary line")))
3788     (when (gnus-visual-p 'summary-highlight 'highlight)
3789       (forward-line -1)
3790       (gnus-summary-highlight-line)
3791       (gnus-run-hooks 'gnus-summary-update-hook)
3792       (forward-line 1))))
3793
3794 (defun gnus-summary-update-line (&optional dont-update)
3795   "Update summary line after change."
3796   (when (and gnus-summary-default-score
3797              (not gnus-summary-inhibit-highlight))
3798     (let* ((gnus-summary-inhibit-highlight t) ; Prevent recursion.
3799            (article (gnus-summary-article-number))
3800            (score (gnus-summary-article-score article)))
3801       (unless dont-update
3802         (if (and gnus-summary-mark-below
3803                  (< (gnus-summary-article-score)
3804                     gnus-summary-mark-below))
3805             ;; This article has a low score, so we mark it as read.
3806             (when (memq article gnus-newsgroup-unreads)
3807               (gnus-summary-mark-article-as-read gnus-low-score-mark))
3808           (when (eq (gnus-summary-article-mark) gnus-low-score-mark)
3809             ;; This article was previously marked as read on account
3810             ;; of a low score, but now it has risen, so we mark it as
3811             ;; unread.
3812             (gnus-summary-mark-article-as-unread gnus-unread-mark)))
3813         (gnus-summary-update-mark
3814          (if (or (null gnus-summary-default-score)
3815                  (<= (abs (- score gnus-summary-default-score))
3816                      gnus-summary-zcore-fuzz))
3817              ?                          ;Whitespace
3818            (if (< score gnus-summary-default-score)
3819                gnus-score-below-mark gnus-score-over-mark))
3820          'score))
3821       ;; Do visual highlighting.
3822       (when (gnus-visual-p 'summary-highlight 'highlight)
3823         (gnus-summary-highlight-line)
3824         (gnus-run-hooks 'gnus-summary-update-hook)))))
3825
3826 (defvar gnus-tmp-new-adopts nil)
3827
3828 (defun gnus-summary-number-of-articles-in-thread (thread &optional level char)
3829   "Return the number of articles in THREAD.
3830 This may be 0 in some cases -- if none of the articles in
3831 the thread are to be displayed."
3832   (let* ((number
3833          ;; Fix by Luc Van Eycken <Luc.VanEycken@esat.kuleuven.ac.be>.
3834           (cond
3835            ((not (listp thread))
3836             1)
3837            ((and (consp thread) (cdr thread))
3838             (apply
3839              '+ 1 (mapcar
3840                    'gnus-summary-number-of-articles-in-thread (cdr thread))))
3841            ((null thread)
3842             1)
3843            ((memq (mail-header-number (car thread)) gnus-newsgroup-limit)
3844             1)
3845            (t 0))))
3846     (when (and level (zerop level) gnus-tmp-new-adopts)
3847       (incf number
3848             (apply '+ (mapcar
3849                        'gnus-summary-number-of-articles-in-thread
3850                        gnus-tmp-new-adopts))))
3851     (if char
3852         (if (> number 1) gnus-not-empty-thread-mark
3853           gnus-empty-thread-mark)
3854       number)))
3855
3856 (defsubst gnus-summary-line-message-size (head)
3857   "Return pretty-printed version of message size.
3858 This function is intended to be used in
3859 `gnus-summary-line-format-alist'."
3860   (let ((c (or (mail-header-chars head) -1)))
3861     (cond ((< c 0) "n/a")               ; chars not available
3862           ((< c (* 1000 10)) (format "%1.1fk" (/ c 1024.0)))
3863           ((< c (* 1000 100)) (format "%dk" (/ c 1024.0)))
3864           ((< c (* 1000 10000)) (format "%1.1fM" (/ c (* 1024.0 1024))))
3865           (t (format "%dM" (/ c (* 1024.0 1024)))))))
3866
3867 (defcustom gnus-user-date-format-alist
3868   '(((gnus-seconds-today) . "Today, %H:%M")
3869     ((+ 86400 (gnus-seconds-today)) . "Yesterday, %H:%M")
3870     (604800 . "%A %H:%M")               ; That's one week
3871     ((gnus-seconds-month) . "%A %d")
3872     ((gnus-seconds-year) . "%B %d")
3873     (t . "%b %d %Y"))                   ; This one is used when no other
3874                                         ; does match
3875   "Specifies date format depending on age of article.
3876 This is an alist of items (AGE . FORMAT).  AGE can be a number (of
3877 seconds) or a Lisp expression evaluating to a number.  When the age of
3878 the article is less than this number, then use `format-time-string'
3879 with the corresponding FORMAT for displaying the date of the article.
3880 If AGE is not a number or a Lisp expression evaluating to a
3881 non-number, then the corresponding FORMAT is used as a default value.
3882
3883 Note that the list is processed from the beginning, so it should be
3884 sorted by ascending AGE.  Also note that items following the first
3885 non-number AGE will be ignored.
3886
3887 You can use the functions `gnus-seconds-today', `gnus-seconds-month'
3888 and `gnus-seconds-year' in the AGE spec.  They return the number of
3889 seconds passed since the start of today, of this month, of this year,
3890 respectively."
3891   :version "24.1"
3892   :group 'gnus-summary-format
3893   :type '(alist :key-type sexp :value-type string))
3894
3895 (defun gnus-user-date (messy-date)
3896   "Format the messy-date according to `gnus-user-date-format-alist'.
3897 Returns \"  ?  \" if there's bad input or if another error occurs.
3898 Input should look like this: \"Sun, 14 Oct 2001 13:34:39 +0200\"."
3899   (condition-case ()
3900       (let* ((messy-date (gnus-float-time (gnus-date-get-time messy-date)))
3901              (now (gnus-float-time))
3902              ;;If we don't find something suitable we'll use this one
3903              (my-format "%b %d '%y"))
3904         (let* ((difference (- now messy-date))
3905                (templist gnus-user-date-format-alist)
3906                (top (eval (caar templist))))
3907           (while (if (numberp top) (< top difference) (not top))
3908             (progn
3909               (setq templist (cdr templist))
3910               (setq top (eval (caar templist)))))
3911           (if (stringp (cdr (car templist)))
3912               (setq my-format (cdr (car templist)))))
3913         (format-time-string (eval my-format) (seconds-to-time messy-date)))
3914     (error "  ?   ")))
3915
3916 (defun gnus-summary-set-local-parameters (group)
3917   "Go through the local params of GROUP and set all variable specs in that list."
3918   (let ((vars '(quit-config active)))   ; Ignore things that aren't
3919                                         ; really variables.
3920     (dolist (elem (gnus-group-find-parameter group))
3921       (and (consp elem)                 ; Has to be a cons.
3922            (consp (cdr elem))           ; The cdr has to be a list.
3923            (symbolp (car elem))         ; Has to be a symbol in there.
3924            (not (memq (car elem) vars))
3925            (ignore-errors
3926              (push (car elem) vars)
3927              ;; Variables like `gnus-show-threads' that are globally
3928              ;; bound, if used as group parameters, need to get to be
3929              ;; buffer-local, whereas just parameters like `gcc-self',
3930              ;; `timestamp', etc. should not be bound as variables.
3931              (if (boundp (car elem))
3932                  (set (make-local-variable (car elem)) (eval (nth 1 elem)))
3933                (eval (nth 1 elem))))))))
3934
3935 (defun gnus-summary-read-group (group &optional show-all no-article
3936                                       kill-buffer no-display backward
3937                                       select-articles)
3938   "Start reading news in newsgroup GROUP.
3939 If SHOW-ALL is non-nil, already read articles are also listed.
3940 If NO-ARTICLE is non-nil, no article is selected initially.
3941 If NO-DISPLAY, don't generate the summary buffer contents.
3942 If KILL-BUFFER, it should be a buffer that's killed once the new
3943 summary buffer has been generated.
3944 If BACKWARD, move point to the previous group in the group buffer
3945 If SELECT-ARTICLES, only select those articles from GROUP."
3946   (let (result)
3947     (while (and group
3948                 (null (setq result
3949                             (let ((gnus-auto-select-next nil))
3950                               (or (gnus-summary-read-group-1
3951                                    group show-all no-article
3952                                    kill-buffer no-display
3953                                    select-articles)
3954                                   (setq show-all nil
3955                                         select-articles nil)))))
3956                 (eq gnus-auto-select-next 'quietly))
3957       (set-buffer gnus-group-buffer)
3958       ;; The entry function called above goes to the next
3959       ;; group automatically, so we go two groups back
3960       ;; if we are searching for the previous group.
3961       (when backward
3962         (gnus-group-prev-unread-group 2))
3963       (if (not (equal group (gnus-group-group-name)))
3964           (setq group (gnus-group-group-name))
3965         (setq group nil)))
3966     result))
3967
3968 (defun gnus-summary-read-group-1 (group show-all no-article
3969                                         kill-buffer no-display
3970                                         &optional select-articles)
3971   ;; Killed foreign groups can't be entered.
3972   ;;  (when (and (not (gnus-group-native-p group))
3973   ;;         (not (gnus-gethash group gnus-newsrc-hashtb)))
3974   ;;    (error "Dead non-native groups can't be entered"))
3975   (gnus-message 7 "Retrieving newsgroup: %s..."
3976                 (gnus-group-decoded-name group))
3977   (let* ((new-group (gnus-summary-setup-buffer group))
3978          (quit-config (gnus-group-quit-config group))
3979          (did-select (and new-group (gnus-select-newsgroup
3980                                      group show-all select-articles))))
3981     (cond
3982      ;; This summary buffer exists already, so we just select it.
3983      ((not new-group)
3984       (gnus-set-global-variables)
3985       (when kill-buffer
3986         (gnus-kill-or-deaden-summary kill-buffer))
3987       (gnus-configure-windows 'summary 'force)
3988       (gnus-set-mode-line 'summary)
3989       (gnus-summary-position-point)
3990       (message "")
3991       t)
3992      ;; We couldn't select this group.
3993      ((null did-select)
3994       (when (and (derived-mode-p 'gnus-summary-mode)
3995                  (not (equal (current-buffer) kill-buffer)))
3996         (kill-buffer (current-buffer))
3997         (if (not quit-config)
3998             (progn
3999               ;; Update the info -- marks might need to be removed,
4000               ;; for instance.
4001               (gnus-summary-update-info)
4002               (set-buffer gnus-group-buffer)
4003               (gnus-group-jump-to-group group)
4004               (gnus-group-next-unread-group 1))
4005           (gnus-handle-ephemeral-exit quit-config)))
4006       (if (null (gnus-list-of-unread-articles group))
4007           (gnus-message 3 "Group %s contains no messages" group)
4008         (gnus-message 3 "Can't select group"))
4009       nil)
4010      ;; The user did a `C-g' while prompting for number of articles,
4011      ;; so we exit this group.
4012      ((eq did-select 'quit)
4013       (and (derived-mode-p 'gnus-summary-mode)
4014            (not (equal (current-buffer) kill-buffer))
4015            (kill-buffer (current-buffer)))
4016       (when kill-buffer
4017         (gnus-kill-or-deaden-summary kill-buffer))
4018       (if (not quit-config)
4019           (progn
4020             (set-buffer gnus-group-buffer)
4021             (gnus-group-jump-to-group group)
4022             (gnus-configure-windows 'group 'force))
4023         (gnus-handle-ephemeral-exit quit-config))
4024       ;; Finally signal the quit.
4025       (signal 'quit nil))
4026      ;; The group was successfully selected.
4027      (t
4028       (gnus-set-global-variables)
4029       (when (boundp 'spam-install-hooks)
4030         (spam-initialize))
4031       ;; Save the active value in effect when the group was entered.
4032       (setq gnus-newsgroup-active
4033             (gnus-copy-sequence
4034              (gnus-active gnus-newsgroup-name)))
4035       (setq gnus-newsgroup-highest (cdr gnus-newsgroup-active))
4036       ;; You can change the summary buffer in some way with this hook.
4037       (gnus-run-hooks 'gnus-select-group-hook)
4038       (when (memq 'summary (gnus-update-format-specifications
4039                             nil 'summary 'summary-mode 'summary-dummy))
4040         ;; The format specification for the summary line was updated,
4041         ;; so we need to update the mark positions as well.
4042         (gnus-update-summary-mark-positions))
4043       ;; Do score processing.
4044       (when gnus-use-scoring
4045         (gnus-possibly-score-headers))
4046       ;; Check whether to fill in the gaps in the threads.
4047       (when gnus-build-sparse-threads
4048         (gnus-build-sparse-threads))
4049       ;; Find the initial limit.
4050       (if show-all
4051           (let ((gnus-newsgroup-dormant nil))
4052             (gnus-summary-initial-limit show-all))
4053         (gnus-summary-initial-limit show-all))
4054       ;; Generate the summary buffer.
4055       (unless no-display
4056         (gnus-summary-prepare))
4057       (when gnus-use-trees
4058         (gnus-tree-open)
4059         (setq gnus-summary-highlight-line-function
4060               'gnus-tree-highlight-article))
4061       ;; If the summary buffer is empty, but there are some low-scored
4062       ;; articles or some excluded dormants, we include these in the
4063       ;; buffer.
4064       (when (and (zerop (buffer-size))
4065                  (not no-display))
4066         (cond (gnus-newsgroup-dormant
4067                (gnus-summary-limit-include-dormant))
4068               ((and gnus-newsgroup-scored show-all)
4069                (gnus-summary-limit-include-expunged t))))
4070       ;; Function `gnus-apply-kill-file' must be called in this hook.
4071       (gnus-run-hooks 'gnus-apply-kill-hook)
4072       (if (and (zerop (buffer-size))
4073                (not no-display))
4074           (progn
4075             ;; This newsgroup is empty.
4076             (gnus-summary-catchup-and-exit nil t)
4077             (gnus-message 6 "No unread news")
4078             (when kill-buffer
4079               (gnus-kill-or-deaden-summary kill-buffer))
4080             ;; Return nil from this function.
4081             nil)
4082         ;; Hide conversation thread subtrees.  We cannot do this in
4083         ;; gnus-summary-prepare-hook since kill processing may not
4084         ;; work with hidden articles.
4085         (gnus-summary-maybe-hide-threads)
4086         (gnus-configure-windows 'summary)
4087         (when kill-buffer
4088           (gnus-kill-or-deaden-summary kill-buffer))
4089         (gnus-summary-auto-select-subject)
4090         ;; Show first unread article if requested.
4091         (if (and (not no-article)
4092                  (not no-display)
4093                  gnus-newsgroup-unreads
4094                  gnus-auto-select-first)
4095             (progn
4096               (let ((art (gnus-summary-article-number)))
4097                 (when (and art
4098                            gnus-plugged
4099                            (not (memq art gnus-newsgroup-undownloaded))
4100                            (not (memq art gnus-newsgroup-downloadable)))
4101                   (gnus-summary-goto-article art))))
4102           ;; Don't select any articles.
4103           (gnus-summary-position-point)
4104           (gnus-configure-windows 'summary 'force)
4105           (gnus-set-mode-line 'summary))
4106         (when (and gnus-auto-center-group
4107                    (get-buffer-window gnus-group-buffer t))
4108           ;; Gotta use windows, because recenter does weird stuff if
4109           ;; the current buffer ain't the displayed window.
4110           (let ((owin (selected-window)))
4111             (select-window (get-buffer-window gnus-group-buffer t))
4112             (when (gnus-group-goto-group group)
4113               (recenter))
4114             (select-window owin)))
4115         ;; Mark this buffer as "prepared".
4116         (setq gnus-newsgroup-prepared t)
4117         (gnus-run-hooks 'gnus-summary-prepared-hook)
4118         (unless (gnus-ephemeral-group-p group)
4119           (gnus-group-update-group group nil t))
4120         t)))))
4121
4122 (defun gnus-summary-auto-select-subject ()
4123   "Select the subject line on initial group entry."
4124   (goto-char (point-min))
4125   (cond
4126    ((eq gnus-auto-select-subject 'best)
4127     (gnus-summary-best-unread-subject))
4128    ((eq gnus-auto-select-subject 'unread)
4129     (gnus-summary-first-unread-subject))
4130    ((eq gnus-auto-select-subject 'unseen)
4131     (gnus-summary-first-unseen-subject))
4132    ((eq gnus-auto-select-subject 'unseen-or-unread)
4133     (gnus-summary-first-unseen-or-unread-subject))
4134    ((eq gnus-auto-select-subject 'first)
4135     ;; Do nothing.
4136     )
4137    ((functionp gnus-auto-select-subject)
4138     (funcall gnus-auto-select-subject))))
4139
4140 (defun gnus-summary-prepare ()
4141   "Generate the summary buffer."
4142   (interactive)
4143   (let ((inhibit-read-only t))
4144     (erase-buffer)
4145     (setq gnus-newsgroup-data nil
4146           gnus-newsgroup-data-reverse nil)
4147     (gnus-run-hooks 'gnus-summary-generate-hook)
4148     ;; Generate the buffer, either with threads or without.
4149     (when gnus-newsgroup-headers
4150       (gnus-summary-prepare-threads
4151        (if gnus-show-threads
4152            (gnus-sort-gathered-threads
4153             (funcall gnus-summary-thread-gathering-function
4154                      (gnus-sort-threads
4155                       (gnus-cut-threads (gnus-make-threads)))))
4156          ;; Unthreaded display.
4157          (gnus-sort-articles gnus-newsgroup-headers))))
4158     (setq gnus-newsgroup-data (nreverse gnus-newsgroup-data))
4159     ;; Call hooks for modifying summary buffer.
4160     (goto-char (point-min))
4161     (gnus-run-hooks 'gnus-summary-prepare-hook)))
4162
4163 (defsubst gnus-general-simplify-subject (subject)
4164   "Simplify subject by the same rules as `gnus-gather-threads-by-subject'."
4165   (setq subject
4166         (cond
4167          ;; Truncate the subject.
4168          (gnus-simplify-subject-functions
4169           (gnus-map-function gnus-simplify-subject-functions subject))
4170          ((numberp gnus-summary-gather-subject-limit)
4171           (setq subject (gnus-simplify-subject-re subject))
4172           (if (> (length subject) gnus-summary-gather-subject-limit)
4173               (substring subject 0 gnus-summary-gather-subject-limit)
4174             subject))
4175          ;; Fuzzily simplify it.
4176          ((eq 'fuzzy gnus-summary-gather-subject-limit)
4177           (gnus-simplify-subject-fuzzy subject))
4178          ;; Just remove the leading "Re:".
4179          (t
4180           (gnus-simplify-subject-re subject))))
4181
4182   (if (and gnus-summary-gather-exclude-subject
4183            (string-match gnus-summary-gather-exclude-subject subject))
4184       nil                         ; This article shouldn't be gathered
4185     subject))
4186
4187 (defun gnus-summary-simplify-subject-query ()
4188   "Query where the respool algorithm would put this article."
4189   (interactive)
4190   (gnus-summary-select-article)
4191   (message "%s" (gnus-general-simplify-subject (gnus-summary-article-subject))))
4192
4193 (defun gnus-gather-threads-by-subject (threads)
4194   "Gather threads by looking at Subject headers."
4195   (if (not gnus-summary-make-false-root)
4196       threads
4197     (let ((hashtb (gnus-make-hashtable 1024))
4198           (prev threads)
4199           (result threads)
4200           subject hthread whole-subject)
4201       (while threads
4202         (setq subject (gnus-general-simplify-subject
4203                        (setq whole-subject (mail-header-subject
4204                                             (caar threads)))))
4205         (when subject
4206           (if (setq hthread (gnus-gethash subject hashtb))
4207               (progn
4208                 ;; We enter a dummy root into the thread, if we
4209                 ;; haven't done that already.
4210                 (unless (stringp (caar hthread))
4211                   (setcar hthread (list whole-subject (car hthread))))
4212                 ;; We add this new gathered thread to this gathered
4213                 ;; thread.
4214                 (setcdr (car hthread)
4215                         (nconc (cdar hthread) (list (car threads))))
4216                 ;; Remove it from the list of threads.
4217                 (setcdr prev (cdr threads))
4218                 (setq threads prev))
4219             ;; Enter this thread into the hash table.
4220             (gnus-sethash subject
4221                           (if gnus-summary-make-false-root-always
4222                               (progn
4223                                 ;; If you want a dummy root above all
4224                                 ;; threads...
4225                                 (setcar threads (list whole-subject
4226                                                       (car threads)))
4227                                 threads)
4228                             threads)
4229                           hashtb)))
4230         (setq prev threads)
4231         (setq threads (cdr threads)))
4232       result)))
4233
4234 (defun gnus-gather-threads-by-references (threads)
4235   "Gather threads by looking at References headers."
4236   (let ((idhashtb (gnus-make-hashtable 1024))
4237         (thhashtb (gnus-make-hashtable 1024))
4238         (prev threads)
4239         (result threads)
4240         ids references id gthread gid entered ref)
4241     (while threads
4242       (when (setq references (mail-header-references (caar threads)))
4243         (setq id (mail-header-id (caar threads))
4244               ids (inline (gnus-split-references references))
4245               entered nil)
4246         (while (setq ref (pop ids))
4247           (setq ids (delete ref ids))
4248           (if (not (setq gid (gnus-gethash ref idhashtb)))
4249               (progn
4250                 (gnus-sethash ref id idhashtb)
4251                 (gnus-sethash id threads thhashtb))
4252             (setq gthread (gnus-gethash gid thhashtb))
4253             (unless entered
4254               ;; We enter a dummy root into the thread, if we
4255               ;; haven't done that already.
4256               (unless (stringp (caar gthread))
4257                 (setcar gthread (list (mail-header-subject (caar gthread))
4258                                       (car gthread))))
4259               ;; We add this new gathered thread to this gathered
4260               ;; thread.
4261               (setcdr (car gthread)
4262                       (nconc (cdar gthread) (list (car threads)))))
4263             ;; Add it into the thread hash table.
4264             (gnus-sethash id gthread thhashtb)
4265             (setq entered t)
4266             ;; Remove it from the list of threads.
4267             (setcdr prev (cdr threads))
4268             (setq threads prev))))
4269       (setq prev threads)
4270       (setq threads (cdr threads)))
4271     result))
4272
4273 (defun gnus-sort-gathered-threads (threads)
4274   "Sort subthreads inside each gathered thread by `gnus-sort-gathered-threads-function'."
4275   (let ((result threads))
4276     (while threads
4277       (when (stringp (caar threads))
4278         (setcdr (car threads)
4279                 (sort (cdar threads) gnus-sort-gathered-threads-function)))
4280       (setq threads (cdr threads)))
4281     result))
4282
4283 (defun gnus-thread-loop-p (root thread)
4284   "Say whether ROOT is in THREAD."
4285   (let ((stack (list thread))
4286         (infloop 0)
4287         th)
4288     (while (setq thread (pop stack))
4289       (setq th (cdr thread))
4290       (while (and th
4291                   (not (eq (caar th) root)))
4292         (pop th))
4293       (if th
4294           ;; We have found a loop.
4295           (let (ref-dep)
4296             (setcdr thread (delq (car th) (cdr thread)))
4297             (if (boundp (setq ref-dep (intern "none"
4298                                               gnus-newsgroup-dependencies)))
4299                 (setcdr (symbol-value ref-dep)
4300                         (nconc (cdr (symbol-value ref-dep))
4301                                (list (car th))))
4302               (set ref-dep (list nil (car th))))
4303             (setq infloop 1
4304                   stack nil))
4305         ;; Push all the subthreads onto the stack.
4306         (push (cdr thread) stack)))
4307     infloop))
4308
4309 (defun gnus-make-threads ()
4310   "Go through the dependency hashtb and find the roots.  Return all threads."
4311   (let (threads)
4312     (while (catch 'infloop
4313              (mapatoms
4314               (lambda (refs)
4315                 ;; Deal with self-referencing References loops.
4316                 (when (and (car (symbol-value refs))
4317                            (not (zerop
4318                                  (apply
4319                                   '+
4320                                   (mapcar
4321                                    (lambda (thread)
4322                                      (gnus-thread-loop-p
4323                                       (car (symbol-value refs)) thread))
4324                                    (cdr (symbol-value refs)))))))
4325                   (setq threads nil)
4326                   (throw 'infloop t))
4327                 (unless (car (symbol-value refs))
4328                   ;; These threads do not refer back to any other
4329                   ;; articles, so they're roots.
4330                   (setq threads (append (cdr (symbol-value refs)) threads))))
4331               gnus-newsgroup-dependencies)))
4332     threads))
4333
4334 ;; Build the thread tree.
4335 (defsubst gnus-dependencies-add-header (header dependencies force-new)
4336   "Enter HEADER into the DEPENDENCIES table if it is not already there.
4337
4338 If FORCE-NEW is not nil, enter HEADER into the DEPENDENCIES table even
4339 if it was already present.
4340
4341 If `gnus-summary-ignore-duplicates' is nil then duplicate Message-IDs
4342 will not be entered in the DEPENDENCIES table.  Otherwise duplicate
4343 Message-IDs will be renamed to a unique Message-ID before being
4344 entered.
4345
4346 Returns HEADER if it was entered in the DEPENDENCIES.  Returns nil otherwise."
4347   (let* ((id (mail-header-id header))
4348          (id-dep (and id (intern id dependencies)))
4349          parent-id ref ref-dep ref-header replaced)
4350     ;; Enter this `header' in the `dependencies' table.
4351     (cond
4352      ((not id-dep)
4353       (setq header nil))
4354      ;; The first two cases do the normal part: enter a new `header'
4355      ;; in the `dependencies' table.
4356      ((not (boundp id-dep))
4357       (set id-dep (list header)))
4358      ((null (car (symbol-value id-dep)))
4359       (setcar (symbol-value id-dep) header))
4360
4361      ;; From here the `header' was already present in the
4362      ;; `dependencies' table.
4363      (force-new
4364       ;; Overrides an existing entry;
4365       ;; just set the header part of the entry.
4366       (setcar (symbol-value id-dep) header)
4367       (setq replaced t))
4368
4369      ;; Renames the existing `header' to a unique Message-ID.
4370      ((not gnus-summary-ignore-duplicates)
4371       ;; An article with this Message-ID has already been seen.
4372       ;; We rename the Message-ID.
4373       (set (setq id-dep (intern (setq id (nnmail-message-id)) dependencies))
4374            (list header))
4375       (mail-header-set-id header id))
4376
4377      ;; The last case ignores an existing entry, except it adds any
4378      ;; additional Xrefs (in case the two articles came from different
4379      ;; servers.
4380      ;; Also sets `header' to nil meaning that the `dependencies'
4381      ;; table was *not* modified.
4382      (t
4383       (mail-header-set-xref
4384        (car (symbol-value id-dep))
4385        (concat (or (mail-header-xref (car (symbol-value id-dep)))
4386                    "")
4387                (or (mail-header-xref header) "")))
4388       (setq header nil)))
4389
4390     (when (and header (not replaced))
4391       ;; First check that we are not creating a References loop.
4392       (setq parent-id (gnus-parent-id (mail-header-references header)))
4393       (setq ref parent-id)
4394       (while (and ref
4395                   (setq ref-dep (intern-soft ref dependencies))
4396                   (boundp ref-dep)
4397                   (setq ref-header (car (symbol-value ref-dep))))
4398         (if (string= id ref)
4399             ;; Yuk!  This is a reference loop.  Make the article be a
4400             ;; root article.
4401             (progn
4402               (mail-header-set-references (car (symbol-value id-dep)) "none")
4403               (setq ref nil)
4404               (setq parent-id nil))
4405           (setq ref (gnus-parent-id (mail-header-references ref-header)))))
4406       (setq ref-dep (intern (or parent-id "none") dependencies))
4407       (if (boundp ref-dep)
4408           (setcdr (symbol-value ref-dep)
4409                   (nconc (cdr (symbol-value ref-dep))
4410                          (list (symbol-value id-dep))))
4411         (set ref-dep (list nil (symbol-value id-dep)))))
4412     header))
4413
4414 (defun gnus-extract-message-id-from-in-reply-to (string)
4415   (if (string-match "<[^>]+>" string)
4416       (substring string (match-beginning 0) (match-end 0))
4417     nil))
4418
4419 (defun gnus-build-sparse-threads ()
4420   (let ((headers gnus-newsgroup-headers)
4421         (mail-parse-charset gnus-newsgroup-charset)
4422         (gnus-summary-ignore-duplicates t)
4423         header references generation relations
4424         subject child end new-child date)
4425     ;; First we create an alist of generations/relations, where
4426     ;; generations is how much we trust the relation, and the relation
4427     ;; is parent/child.
4428     (gnus-message 7 "Making sparse threads...")
4429     (save-excursion
4430       (nnheader-set-temp-buffer " *gnus sparse threads*")
4431       (while (setq header (pop headers))
4432         (when (and (setq references (mail-header-references header))
4433                    (not (string= references "")))
4434           (insert references)
4435           (setq child (mail-header-id header)
4436                 subject (mail-header-subject header)
4437                 date (mail-header-date header)
4438                 generation 0)
4439           (while (search-backward ">" nil t)
4440             (setq end (1+ (point)))
4441             (when (search-backward "<" nil t)
4442               (setq new-child (buffer-substring (point) end))
4443               (push (list (incf generation)
4444                           child (setq child new-child)
4445                           subject date)
4446                     relations)))
4447           (when child
4448             (push (list (1+ generation) child nil subject) relations))
4449           (erase-buffer)))
4450       (kill-buffer (current-buffer)))
4451     ;; Sort over trustworthiness.
4452     (dolist (relation (sort relations 'car-less-than-car))
4453       (when (gnus-dependencies-add-header
4454              (make-full-mail-header
4455               gnus-reffed-article-number
4456               (nth 3 relation) "" (or (nth 4 relation) "")
4457               (nth 1 relation)
4458               (or (nth 2 relation) "") 0 0 "")
4459              gnus-newsgroup-dependencies nil)
4460         (push gnus-reffed-article-number gnus-newsgroup-limit)
4461         (push gnus-reffed-article-number gnus-newsgroup-sparse)
4462         (push (cons gnus-reffed-article-number gnus-sparse-mark)
4463               gnus-newsgroup-reads)
4464         (decf gnus-reffed-article-number)))
4465     (gnus-message 7 "Making sparse threads...done")))
4466
4467 (defun gnus-build-old-threads ()
4468   ;; Look at all the articles that refer back to old articles, and
4469   ;; fetch the headers for the articles that aren't there.  This will
4470   ;; build complete threads - if the roots haven't been expired by the
4471   ;; server, that is.
4472   (let ((mail-parse-charset gnus-newsgroup-charset)
4473         id heads)
4474     (mapatoms
4475      (lambda (refs)
4476        (when (not (car (symbol-value refs)))
4477          (setq heads (cdr (symbol-value refs)))
4478          (while heads
4479            (if (memq (mail-header-number (caar heads))
4480                      gnus-newsgroup-dormant)
4481                (setq heads (cdr heads))
4482              (setq id (symbol-name refs))
4483              (while (and (setq id (gnus-build-get-header id))
4484                          (not (car (gnus-id-to-thread id)))))
4485              (setq heads nil)))))
4486      gnus-newsgroup-dependencies)))
4487
4488 (defsubst gnus-remove-odd-characters (string)
4489   "Translate STRING into something that doesn't contain weird characters."
4490   (mm-subst-char-in-string
4491    ?\r ?\-
4492    (mm-subst-char-in-string ?\n ?\- string t) t))
4493
4494 ;; This function has to be called with point after the article number
4495 ;; on the beginning of the line.
4496 (defsubst gnus-nov-parse-line (number dependencies &optional force-new)
4497   (let ((eol (point-at-eol))
4498         (buffer (current-buffer))
4499         header references in-reply-to)
4500
4501     ;; overview: [num subject from date id refs chars lines misc]
4502     (unwind-protect
4503         (let (x)
4504           (narrow-to-region (point) eol)
4505           (unless (eobp)
4506             (forward-char))
4507
4508           (setq header
4509                 (make-full-mail-header
4510                  number                 ; number
4511                  (condition-case ()     ; subject
4512                      (gnus-remove-odd-characters
4513                       (funcall gnus-decode-encoded-word-function
4514                                (setq x (nnheader-nov-field))))
4515                    (error x))
4516                  (condition-case ()     ; from
4517                      (gnus-remove-odd-characters
4518                       (funcall gnus-decode-encoded-address-function
4519                                (setq x (nnheader-nov-field))))
4520                    (error x))
4521                  (nnheader-nov-field)   ; date
4522                  (nnheader-nov-read-message-id number)  ; id
4523                  (setq references (nnheader-nov-field)) ; refs
4524                  (nnheader-nov-read-integer) ; chars
4525                  (nnheader-nov-read-integer) ; lines
4526                  (unless (eobp)
4527                    (if (looking-at "Xref: ")
4528                        (goto-char (match-end 0)))
4529                    (nnheader-nov-field)) ; Xref
4530                  (nnheader-nov-parse-extra)))) ; extra
4531
4532       (widen))
4533
4534     (when (and (string= references "")
4535                (setq in-reply-to (mail-header-extra header))
4536                (setq in-reply-to (cdr (assq 'In-Reply-To in-reply-to))))
4537       (mail-header-set-references
4538        header (gnus-extract-message-id-from-in-reply-to in-reply-to)))
4539
4540     (when gnus-alter-header-function
4541       (funcall gnus-alter-header-function header))
4542     (gnus-dependencies-add-header header dependencies force-new)))
4543
4544 (defun gnus-build-get-header (id)
4545   "Look through the buffer of NOV lines and find the header to ID.
4546 Enter this line into the dependencies hash table, and return
4547 the id of the parent article (if any)."
4548   (let ((deps gnus-newsgroup-dependencies)
4549         found header)
4550     (prog1
4551         (with-current-buffer nntp-server-buffer
4552           (let ((case-fold-search nil))
4553             (goto-char (point-min))
4554             (while (and (not found)
4555                         (search-forward id nil t))
4556               (beginning-of-line)
4557               (setq found (looking-at
4558                            (format "^[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t%s"
4559                                    (regexp-quote id))))
4560               (or found (beginning-of-line 2)))
4561             (when found
4562               (beginning-of-line)
4563               (and
4564                (setq header (gnus-nov-parse-line
4565                              (read (current-buffer)) deps))
4566                (gnus-parent-id (mail-header-references header))))))
4567       (when header
4568         (let ((number (mail-header-number header)))
4569           (push number gnus-newsgroup-limit)
4570           (push header gnus-newsgroup-headers)
4571           (if (memq number gnus-newsgroup-unselected)
4572               (progn
4573                 (setq gnus-newsgroup-unreads
4574                       (gnus-add-to-sorted-list gnus-newsgroup-unreads
4575                                                number))
4576                 (setq gnus-newsgroup-unselected
4577                       (delq number gnus-newsgroup-unselected)))
4578             (push number gnus-newsgroup-ancient)))))))
4579
4580 (defun gnus-build-all-threads ()
4581   "Read all the headers."
4582   (let ((gnus-summary-ignore-duplicates t)
4583         (mail-parse-charset gnus-newsgroup-charset)
4584         (dependencies gnus-newsgroup-dependencies)
4585         header article)
4586     (with-current-buffer nntp-server-buffer
4587       (let ((case-fold-search nil))
4588         (goto-char (point-min))
4589         (while (not (eobp))
4590           (ignore-errors
4591             (setq article (read (current-buffer))
4592                   header (gnus-nov-parse-line article dependencies t)))
4593           (when header
4594             (with-current-buffer gnus-summary-buffer
4595               (push header gnus-newsgroup-headers)
4596               (if (memq (setq article (mail-header-number header))
4597                         gnus-newsgroup-unselected)
4598                   (progn
4599                     (setq gnus-newsgroup-unreads
4600                           (gnus-add-to-sorted-list
4601                            gnus-newsgroup-unreads article))
4602                     (setq gnus-newsgroup-unselected
4603                           (delq article gnus-newsgroup-unselected)))
4604                 (push article gnus-newsgroup-ancient)))
4605             (forward-line 1)))))))
4606
4607 (defun gnus-summary-update-article-line (article header)
4608   "Update the line for ARTICLE using HEADER."
4609   (let* ((id (mail-header-id header))
4610          (thread (gnus-id-to-thread id)))
4611     (unless thread
4612       (error "Article in no thread"))
4613     ;; Update the thread.
4614     (setcar thread header)
4615     (gnus-summary-goto-subject article)
4616     (let* ((datal (gnus-data-find-list article))
4617            (data (car datal))
4618            (inhibit-read-only t)
4619            (level (gnus-summary-thread-level)))
4620       (gnus-delete-line)
4621       (let ((inserted (- (point)
4622                          (progn
4623                            (gnus-summary-insert-line
4624                             header level nil
4625                             (memq article gnus-newsgroup-undownloaded)
4626                             (gnus-article-mark article)
4627                             (memq article gnus-newsgroup-replied)
4628                             (memq article gnus-newsgroup-expirable)
4629                             ;; Only insert the Subject string when it's different
4630                             ;; from the previous Subject string.
4631                             (if (and
4632                                  gnus-show-threads
4633                                  (gnus-subject-equal
4634                                   (condition-case ()
4635                                       (mail-header-subject
4636                                        (gnus-data-header
4637                                         (cadr
4638                                          (gnus-data-find-list
4639                                           article
4640                                           (gnus-data-list t)))))
4641                                     ;; Error on the side of excessive subjects.
4642                                     (error ""))
4643                                   (mail-header-subject header)))
4644                                 ""
4645                               (mail-header-subject header))
4646                             nil (cdr (assq article gnus-newsgroup-scored))
4647                             (memq article gnus-newsgroup-processable))
4648                            (point)))))
4649         (when (cdr datal)
4650           (gnus-data-update-list
4651            (cdr datal)
4652            (- (gnus-data-pos data) (gnus-data-pos (cadr datal)) inserted)))))))
4653
4654 (defun gnus-summary-update-article (article &optional iheader)
4655   "Update ARTICLE in the summary buffer."
4656   (set-buffer gnus-summary-buffer)
4657   (let* ((header (gnus-summary-article-header article))
4658          (id (mail-header-id header))
4659          (data (gnus-data-find article))
4660          (thread (gnus-id-to-thread id))
4661          (references (mail-header-references header))
4662          (parent
4663           (gnus-id-to-thread
4664            (or (gnus-parent-id
4665                 (when (and references
4666                            (not (equal "" references)))
4667                   references))
4668                "none")))
4669          (inhibit-read-only t)
4670          (old (car thread)))
4671     (when thread
4672       (unless iheader
4673         (setcar thread nil)
4674         (when parent
4675           (delq thread parent)))
4676       (if (gnus-summary-insert-subject id header)
4677           ;; Set the (possibly) new article number in the data structure.
4678           (gnus-data-set-number data (gnus-id-to-article id))
4679         (setcar thread old)
4680         nil))))
4681
4682 (defun gnus-rebuild-thread (id &optional line)
4683   "Rebuild the thread containing ID.
4684 If LINE, insert the rebuilt thread starting on line LINE."
4685   (let ((inhibit-read-only t)
4686         old-pos current thread data)
4687     (if (not gnus-show-threads)
4688         (setq thread (list (car (gnus-id-to-thread id))))
4689       ;; Get the thread this article is part of.
4690       (setq thread (gnus-remove-thread id)))
4691     (setq old-pos (point-at-bol))
4692     (setq current (save-excursion
4693                     (and (re-search-backward "[\r\n]" nil t)
4694                          (gnus-summary-article-number))))
4695     ;; If this is a gathered thread, we have to go some re-gathering.
4696     (when (stringp (car thread))
4697       (let ((subject (car thread))
4698             roots thr)
4699         (setq thread (cdr thread))
4700         (while thread
4701           (unless (memq (setq thr (gnus-id-to-thread
4702                                    (gnus-root-id
4703                                     (mail-header-id (caar thread)))))
4704                         roots)
4705             (push thr roots))
4706           (setq thread (cdr thread)))
4707         ;; We now have all (unique) roots.
4708         (if (= (length roots) 1)
4709             ;; All the loose roots are now one solid root.
4710             (setq thread (car roots))
4711           (setq thread (cons subject (gnus-sort-threads roots))))))
4712     (let (threads)
4713       ;; We then insert this thread into the summary buffer.
4714       (when line
4715         (goto-char (point-min))
4716         (forward-line (1- line)))
4717       (let (gnus-newsgroup-data gnus-newsgroup-threads)
4718         (if gnus-show-threads
4719             (gnus-summary-prepare-threads (gnus-cut-threads (list thread)))
4720           (gnus-summary-prepare-unthreaded thread))
4721         (setq data (nreverse gnus-newsgroup-data))
4722         (setq threads gnus-newsgroup-threads))
4723       ;; We splice the new data into the data structure.
4724       ;;!!! This is kinda bogus.  We assume that in LINE is non-nil,
4725       ;;!!! then we want to insert at the beginning of the buffer.
4726       ;;!!! That happens to be true with Gnus now, but that may
4727       ;;!!! change in the future.  Perhaps.
4728       (gnus-data-enter-list
4729        (if line nil current) data (- (point) old-pos))
4730       (setq gnus-newsgroup-threads
4731             (nconc threads gnus-newsgroup-threads))
4732       (gnus-data-compute-positions))))
4733
4734 (defun gnus-number-to-header (number)
4735   "Return the header for article NUMBER."
4736   (let ((headers gnus-newsgroup-headers))
4737     (while (and headers
4738                 (not (= number (mail-header-number (car headers)))))
4739       (pop headers))
4740     (when headers
4741       (car headers))))
4742
4743 (defun gnus-parent-headers (in-headers &optional generation)
4744   "Return the headers of the GENERATIONth parent of HEADERS."
4745   (unless generation
4746     (setq generation 1))
4747   (let ((parent t)
4748         (headers in-headers)
4749         references)
4750     (while (and parent
4751                 (not (zerop generation))
4752                 (setq references (mail-header-references headers)))
4753       (setq headers (if (and references
4754                              (setq parent (gnus-parent-id references)))
4755                         (car (gnus-id-to-thread parent))
4756                       nil))
4757       (decf generation))
4758     (and (not (eq headers in-headers))
4759          headers)))
4760
4761 (defun gnus-id-to-thread (id)
4762   "Return the (sub-)thread where ID appears."
4763   (gnus-gethash id gnus-newsgroup-dependencies))
4764
4765 (defun gnus-id-to-article (id)
4766   "Return the article number of ID."
4767   (let ((thread (gnus-id-to-thread id)))
4768     (when (and thread
4769                (car thread))
4770       (mail-header-number (car thread)))))
4771
4772 (defun gnus-id-to-header (id)
4773   "Return the article headers of ID."
4774   (car (gnus-id-to-thread id)))
4775
4776 (defun gnus-article-displayed-root-p (article)
4777   "Say whether ARTICLE is a root(ish) article."
4778   (let ((level (gnus-summary-thread-level article))
4779         (refs (mail-header-references  (gnus-summary-article-header article)))
4780         particle)
4781     (cond
4782      ((null level) nil)
4783      ((zerop level) t)
4784      ((null refs) t)
4785      ((null (gnus-parent-id refs)) t)
4786      ((and (= 1 level)
4787            (null (setq particle (gnus-id-to-article
4788                                  (gnus-parent-id refs))))
4789            (null (gnus-summary-thread-level particle)))))))
4790
4791 (defun gnus-root-id (id)
4792   "Return the id of the root of the thread where ID appears."
4793   (let (last-id prev)
4794     (while (and id (setq prev (car (gnus-id-to-thread id))))
4795       (setq last-id id
4796             id (gnus-parent-id (mail-header-references prev))))
4797     last-id))
4798
4799 (defun gnus-articles-in-thread (thread)
4800   "Return the list of articles in THREAD."
4801   (cons (mail-header-number (car thread))
4802         (apply 'nconc (mapcar 'gnus-articles-in-thread (cdr thread)))))
4803
4804 (defun gnus-remove-thread (id &optional dont-remove)
4805   "Remove the thread that has ID in it."
4806   (let (headers thread last-id)
4807     ;; First go up in this thread until we find the root.
4808     (setq last-id (gnus-root-id id)
4809           headers (message-flatten-list (gnus-id-to-thread last-id)))
4810     ;; We have now found the real root of this thread.  It might have
4811     ;; been gathered into some loose thread, so we have to search
4812     ;; through the threads to find the thread we wanted.
4813     (let ((threads gnus-newsgroup-threads)
4814           sub)
4815       (while threads
4816         (setq sub (car threads))
4817         (if (stringp (car sub))
4818             ;; This is a gathered thread, so we look at the roots
4819             ;; below it to find whether this article is in this
4820             ;; gathered root.
4821             (progn
4822               (setq sub (cdr sub))
4823               (while sub
4824                 (when (member (caar sub) headers)
4825                   (setq thread (car threads)
4826                         threads nil
4827                         sub nil))
4828                 (setq sub (cdr sub))))
4829           ;; It's an ordinary thread, so we check it.
4830           (when (eq (car sub) (car headers))
4831             (setq thread sub
4832                   threads nil)))
4833         (setq threads (cdr threads)))
4834       ;; If this article is in no thread, then it's a root.
4835       (if thread
4836           (unless dont-remove
4837             (setq gnus-newsgroup-threads (delq thread gnus-newsgroup-threads)))
4838         (setq thread (gnus-id-to-thread last-id)))
4839       (when thread
4840         (prog1
4841             thread                      ; We return this thread.
4842           (unless dont-remove
4843             (if (stringp (car thread))
4844                 (progn
4845                   ;; If we use dummy roots, then we have to remove the
4846                   ;; dummy root as well.
4847                   (when (eq gnus-summary-make-false-root 'dummy)
4848                     ;; We go to the dummy root by going to
4849                     ;; the first sub-"thread", and then one line up.
4850                     (gnus-summary-goto-article
4851                      (mail-header-number (caadr thread)))
4852                     (forward-line -1)
4853                     (gnus-delete-line)
4854                     (gnus-data-compute-positions))
4855                   (setq thread (cdr thread))
4856                   (while thread
4857                     (gnus-remove-thread-1 (car thread))
4858                     (setq thread (cdr thread))))
4859               (gnus-remove-thread-1 thread))))))))
4860
4861 (defun gnus-remove-thread-1 (thread)
4862   "Remove the thread THREAD recursively."
4863   (let ((number (mail-header-number (pop thread)))
4864         d)
4865     (setq thread (reverse thread))
4866     (while thread
4867       (gnus-remove-thread-1 (pop thread)))
4868     (when (setq d (gnus-data-find number))
4869       (goto-char (gnus-data-pos d))
4870       (gnus-summary-show-thread)
4871       (gnus-data-remove
4872        number
4873        (- (point-at-bol)
4874           (prog1
4875               (1+ (point-at-eol))
4876             (gnus-delete-line)))))))
4877
4878 (defun gnus-sort-threads-recursive (threads func)
4879   ;; Responsible for sorting the root articles of threads.
4880   (let ((subthread-sort-func (if (eq gnus-subthread-sort-functions
4881                                      'gnus-thread-sort-functions)
4882                                  func
4883                                (gnus-make-sort-function
4884                                 gnus-subthread-sort-functions))))
4885     (sort (mapcar (lambda (thread)
4886                     (cons (car thread)
4887                           (and (cdr thread)
4888                                (gnus-sort-subthreads-recursive
4889                                 (cdr thread) subthread-sort-func))))
4890                   threads) func)))
4891
4892 (defun gnus-sort-subthreads-recursive (threads func)
4893   ;; Responsible for sorting subthreads.
4894   (sort (mapcar (lambda (thread)
4895                   (cons (car thread)
4896                         (and (cdr thread)
4897                              (gnus-sort-subthreads-recursive (cdr thread) func))))
4898                 threads) func))
4899
4900 (defun gnus-sort-threads-loop (threads func)
4901   (let* ((superthread (cons nil threads))
4902          (stack (list (cons superthread threads)))
4903          remaining-threads thread)
4904     (while stack
4905       (setq remaining-threads (cdr (car stack)))
4906       (if remaining-threads
4907           (progn (setq thread (car remaining-threads))
4908                  (setcdr (car stack) (cdr remaining-threads))
4909                  (if (cdr thread)
4910                      (push (cons thread (cdr thread)) stack)))
4911         (setq thread (caar stack))
4912         (setcdr thread (sort (cdr thread) func))
4913         (pop stack)))
4914     (cdr superthread)))
4915
4916 (defun gnus-sort-threads (threads)
4917   "Sort THREADS."
4918   (if (not gnus-thread-sort-functions)
4919       threads
4920     (gnus-message 8 "Sorting threads...")
4921     (prog1
4922         (condition-case nil
4923             (let ((max-lisp-eval-depth (max max-lisp-eval-depth 5000))
4924                   (sort-func (gnus-make-sort-function gnus-thread-sort-functions)))
4925               (gnus-sort-threads-recursive threads sort-func))
4926           ;; Even after binding max-lisp-eval-depth, the recursive
4927           ;; sorter might fail for very long threads.  In that case,
4928           ;; try using a (less well-tested) non-recursive sorter.
4929           (error (gnus-message 9 "Sorting threads with loop...")
4930                  (gnus-sort-threads-loop
4931                   threads (gnus-make-sort-function
4932                            gnus-thread-sort-functions))))
4933       (gnus-message 8 "Sorting threads...done"))))
4934
4935 (defun gnus-sort-articles (articles)
4936   "Sort ARTICLES."
4937   (when gnus-article-sort-functions
4938     (gnus-message 7 "Sorting articles...")
4939     (prog1
4940         (setq gnus-newsgroup-headers
4941               (sort articles (gnus-make-sort-function
4942                               gnus-article-sort-functions)))
4943       (gnus-message 7 "Sorting articles...done"))))
4944
4945 ;; Written by Hallvard B Furuseth <h.b.furuseth@usit.uio.no>.
4946 (defmacro gnus-thread-header (thread)
4947   "Return header of first article in THREAD.
4948 Note that THREAD must never, ever be anything else than a variable -
4949 using some other form will lead to serious barfage."
4950   (or (symbolp thread) (signal 'wrong-type-argument '(symbolp thread)))
4951   ;; (8% speedup to gnus-summary-prepare, just for fun :-)
4952   (list 'byte-code "\10\211:\203\17\0\211@;\203\16\0A@@\207"
4953         (vector thread) 2))
4954
4955 (defsubst gnus-article-sort-by-number (h1 h2)
4956   "Sort articles by article number."
4957   (< (mail-header-number h1)
4958      (mail-header-number h2)))
4959
4960 (defun gnus-thread-sort-by-number (h1 h2)
4961   "Sort threads by root article number."
4962   (gnus-article-sort-by-number
4963    (gnus-thread-header h1) (gnus-thread-header h2)))
4964
4965 (defsubst gnus-article-sort-by-random (h1 h2)
4966   "Sort articles randomly."
4967   (zerop (random 2)))
4968
4969 (defun gnus-thread-sort-by-random (h1 h2)
4970   "Sort threads randomly."
4971   (gnus-article-sort-by-random
4972    (gnus-thread-header h1) (gnus-thread-header h2)))
4973
4974 (defsubst gnus-article-sort-by-lines (h1 h2)
4975   "Sort articles by article Lines header."
4976   (< (mail-header-lines h1)
4977      (mail-header-lines h2)))
4978
4979 (defun gnus-thread-sort-by-lines (h1 h2)
4980   "Sort threads by root article Lines header."
4981   (gnus-article-sort-by-lines
4982    (gnus-thread-header h1) (gnus-thread-header h2)))
4983
4984 (defsubst gnus-article-sort-by-chars (h1 h2)
4985   "Sort articles by octet length."
4986   (< (mail-header-chars h1)
4987      (mail-header-chars h2)))
4988
4989 (defun gnus-thread-sort-by-chars (h1 h2)
4990   "Sort threads by root article octet length."
4991   (gnus-article-sort-by-chars
4992    (gnus-thread-header h1) (gnus-thread-header h2)))
4993
4994 (defsubst gnus-article-sort-by-author (h1 h2)
4995   "Sort articles by root author."
4996   (gnus-string<
4997    (let ((extract (funcall
4998                    gnus-extract-address-components
4999                    (mail-header-from h1))))
5000      (or (car extract) (cadr extract) ""))
5001    (let ((extract (funcall
5002                    gnus-extract-address-components
5003                    (mail-header-from h2))))
5004      (or (car extract) (cadr extract) ""))))
5005
5006 (defun gnus-thread-sort-by-author (h1 h2)
5007   "Sort threads by root author."
5008   (gnus-article-sort-by-author
5009    (gnus-thread-header h1)  (gnus-thread-header h2)))
5010
5011 (defsubst gnus-article-sort-by-recipient (h1 h2)
5012   "Sort articles by recipient."
5013   (gnus-string<
5014    (let ((extract (funcall
5015                    gnus-extract-address-components
5016                    (or (cdr (assq 'To (mail-header-extra h1))) ""))))
5017      (or (car extract) (cadr extract)))
5018    (let ((extract (funcall
5019                    gnus-extract-address-components
5020                    (or (cdr (assq 'To (mail-header-extra h2))) ""))))
5021      (or (car extract) (cadr extract)))))
5022
5023 (defun gnus-thread-sort-by-recipient (h1 h2)
5024   "Sort threads by root recipient."
5025   (gnus-article-sort-by-recipient
5026    (gnus-thread-header h1) (gnus-thread-header h2)))
5027
5028 (defsubst gnus-article-sort-by-subject (h1 h2)
5029   "Sort articles by root subject."
5030   (gnus-string<
5031    (downcase (gnus-simplify-subject-re (mail-header-subject h1)))
5032    (downcase (gnus-simplify-subject-re (mail-header-subject h2)))))
5033
5034 (defun gnus-thread-sort-by-subject (h1 h2)
5035   "Sort threads by root subject."
5036   (gnus-article-sort-by-subject
5037    (gnus-thread-header h1) (gnus-thread-header h2)))
5038
5039 (defsubst gnus-article-sort-by-date (h1 h2)
5040   "Sort articles by root article date."
5041   (time-less-p
5042    (gnus-date-get-time (mail-header-date h1))
5043    (gnus-date-get-time (mail-header-date h2))))
5044
5045 (defun gnus-thread-sort-by-date (h1 h2)
5046   "Sort threads by root article date."
5047   (gnus-article-sort-by-date
5048    (gnus-thread-header h1) (gnus-thread-header h2)))
5049
5050 (defsubst gnus-article-sort-by-score (h1 h2)
5051   "Sort articles by root article score.
5052 Unscored articles will be counted as having a score of zero."
5053   (> (or (cdr (assq (mail-header-number h1)
5054                     gnus-newsgroup-scored))
5055          gnus-summary-default-score 0)
5056      (or (cdr (assq (mail-header-number h2)
5057                     gnus-newsgroup-scored))
5058          gnus-summary-default-score 0)))
5059
5060 (defun gnus-thread-sort-by-score (h1 h2)
5061   "Sort threads by root article score."
5062   (gnus-article-sort-by-score
5063    (gnus-thread-header h1) (gnus-thread-header h2)))
5064
5065 (defun gnus-thread-sort-by-total-score (h1 h2)
5066   "Sort threads by the sum of all scores in the thread.
5067 Unscored articles will be counted as having a score of zero."
5068   (> (gnus-thread-total-score h1) (gnus-thread-total-score h2)))
5069
5070 (defun gnus-thread-total-score (thread)
5071   ;; This function find the total score of THREAD.
5072   (cond
5073    ((null thread)
5074     0)
5075    ((consp thread)
5076     (if (stringp (car thread))
5077         (apply gnus-thread-score-function 0
5078                (mapcar 'gnus-thread-total-score-1 (cdr thread)))
5079       (gnus-thread-total-score-1 thread)))
5080    (t
5081     (gnus-thread-total-score-1 (list thread)))))
5082
5083 (defun gnus-article-sort-by-most-recent-number (h1 h2)
5084   "Sort articles by number."
5085   (gnus-article-sort-by-number h1 h2))
5086
5087 (defun gnus-thread-sort-by-most-recent-number (h1 h2)
5088   "Sort threads such that the thread with the most recently arrived article comes first."
5089   (> (gnus-thread-highest-number h1) (gnus-thread-highest-number h2)))
5090
5091 (defun gnus-thread-highest-number (thread)
5092   "Return the highest article number in THREAD."
5093   (apply 'max (mapcar (lambda (header)
5094                         (mail-header-number header))
5095                       (message-flatten-list thread))))
5096
5097 (defun gnus-article-sort-by-most-recent-date (h1 h2)
5098   "Sort articles by number."
5099   (gnus-article-sort-by-date h1 h2))
5100
5101 (defun gnus-thread-sort-by-most-recent-date (h1 h2)
5102   "Sort threads such that the thread with the most recently dated article comes first."
5103   (> (gnus-thread-latest-date h1) (gnus-thread-latest-date h2)))
5104
5105 ; Since this is called not only to sort the top-level threads, but
5106 ; also in recursive sorts to order the articles within a thread, each
5107 ; article will be processed many times.  Thus it speeds things up
5108 ; quite a bit to use gnus-date-get-time, which caches the time value.
5109 (defun gnus-thread-latest-date (thread)
5110   "Return the highest article date in THREAD."
5111   (apply 'max
5112          (mapcar (lambda (header) (gnus-float-time
5113                                    (gnus-date-get-time
5114                                     (mail-header-date header))))
5115                  (message-flatten-list thread))))
5116
5117 (defun gnus-thread-total-score-1 (root)
5118   ;; This function find the total score of the thread below ROOT.
5119   (setq root (car root))
5120   (apply gnus-thread-score-function
5121          (or (append
5122               (mapcar 'gnus-thread-total-score
5123                       (cdr (gnus-id-to-thread (mail-header-id root))))
5124               (when (> (mail-header-number root) 0)
5125                 (list (or (cdr (assq (mail-header-number root)
5126                                      gnus-newsgroup-scored))
5127                           gnus-summary-default-score 0))))
5128              (list gnus-summary-default-score)
5129              '(0))))
5130
5131 ;; Added by Per Abrahamsen <amanda@iesd.auc.dk>.
5132 (defvar gnus-tmp-prev-subject nil)
5133 (defvar gnus-tmp-false-parent nil)
5134 (defvar gnus-tmp-root-expunged nil)
5135 (defvar gnus-tmp-dummy-line nil)
5136
5137 (defun gnus-extra-header (type &optional header)
5138   "Return the extra header of TYPE."
5139   (or (cdr (assq type (mail-header-extra (or header gnus-tmp-header))))
5140       ""))
5141
5142 (defvar gnus-tmp-thread-tree-header-string "")
5143
5144 (defcustom gnus-sum-thread-tree-root "> "
5145   "With %B spec, used for the root of a thread.
5146 If nil, use subject instead."
5147   :version "22.1"
5148   :type '(radio (const :format "%v  " nil) string)
5149   :group 'gnus-thread)
5150
5151 (defcustom gnus-sum-thread-tree-false-root "> "
5152   "With %B spec, used for a false root of a thread.
5153 If nil, use subject instead."
5154   :version "22.1"
5155   :type '(radio (const :format "%v  " nil) string)
5156   :group 'gnus-thread)
5157
5158 (defcustom gnus-sum-thread-tree-single-indent ""
5159   "With %B spec, used for a thread with just one message.
5160 If nil, use subject instead."
5161   :version "22.1"
5162   :type '(radio (const :format "%v  " nil) string)
5163   :group 'gnus-thread)
5164
5165 (defcustom gnus-sum-thread-tree-vertical "| "
5166   "With %B spec, used for drawing a vertical line."
5167   :version "22.1"
5168   :type 'string
5169   :group 'gnus-thread)
5170
5171 (defcustom gnus-sum-thread-tree-indent "  "
5172   "With %B spec, used for indenting."
5173   :version "22.1"
5174   :type 'string
5175   :group 'gnus-thread)
5176
5177 (defcustom gnus-sum-thread-tree-leaf-with-other "+-> "
5178   "With %B spec, used for a leaf with brothers."
5179   :version "22.1"
5180   :type 'string
5181   :group 'gnus-thread)
5182
5183 (defcustom gnus-sum-thread-tree-single-leaf "\\-> "
5184   "With %B spec, used for a leaf without brothers."
5185   :version "22.1"
5186   :type 'string
5187   :group 'gnus-thread)
5188
5189 (defcustom gnus-summary-display-while-building nil
5190   "If non-nil, show and update the summary buffer as it's being built.
5191 If the value is t, update the buffer after every line is inserted.  If
5192 the value is an integer (N), update the display every N lines."
5193   :version "22.1"
5194   :group 'gnus-thread
5195   :type '(choice (const :tag "off" nil)
5196                  number
5197                  (const :tag "frequently" t)))
5198
5199 (defun gnus-summary-prepare-threads (threads)
5200   "Prepare summary buffer from THREADS and indentation LEVEL.
5201 THREADS is either a list of `(PARENT [(CHILD1 [(GRANDCHILD ...]...) ...])'
5202 or a straight list of headers."
5203   (gnus-message 7 "Generating summary...")
5204
5205   (setq gnus-newsgroup-threads threads)
5206   (beginning-of-line)
5207
5208   (let ((gnus-tmp-level 0)
5209         (default-score (or gnus-summary-default-score 0))
5210         (gnus-visual-p (gnus-visual-p 'summary-highlight 'highlight))
5211         (building-line-count gnus-summary-display-while-building)
5212         (building-count (integerp gnus-summary-display-while-building))
5213         thread number subject stack state gnus-tmp-gathered beg-match
5214         new-roots gnus-tmp-new-adopts thread-end simp-subject
5215         gnus-tmp-header gnus-tmp-unread gnus-tmp-downloaded
5216         gnus-tmp-replied gnus-tmp-subject-or-nil
5217         gnus-tmp-dummy gnus-tmp-indentation gnus-tmp-lines gnus-tmp-score
5218         gnus-tmp-score-char gnus-tmp-from gnus-tmp-name
5219         gnus-tmp-number gnus-tmp-opening-bracket gnus-tmp-closing-bracket
5220         tree-stack)
5221
5222     (setq gnus-tmp-prev-subject nil
5223           gnus-tmp-thread-tree-header-string "")
5224
5225     (if (vectorp (car threads))
5226         ;; If this is a straight (sic) list of headers, then a
5227         ;; threaded summary display isn't required, so we just create
5228         ;; an unthreaded one.
5229         (gnus-summary-prepare-unthreaded threads)
5230
5231       ;; Do the threaded display.
5232
5233       (if gnus-summary-display-while-building
5234           (switch-to-buffer (buffer-name)))
5235       (while (or threads stack gnus-tmp-new-adopts new-roots)
5236
5237         (if (and (= gnus-tmp-level 0)
5238                  (or (not stack)
5239                      (= (caar stack) 0))
5240                  (not gnus-tmp-false-parent)
5241                  (or gnus-tmp-new-adopts new-roots))
5242             (if gnus-tmp-new-adopts
5243                 (setq gnus-tmp-level (if gnus-tmp-root-expunged 0 1)
5244                       thread (list (car gnus-tmp-new-adopts))
5245                       gnus-tmp-header (caar thread)
5246                       gnus-tmp-new-adopts (cdr gnus-tmp-new-adopts))
5247               (when new-roots
5248                 (setq thread (list (car new-roots))
5249                       gnus-tmp-header (caar thread)
5250                       new-roots (cdr new-roots))))
5251
5252           (if threads
5253               ;; If there are some threads, we do them before the
5254               ;; threads on the stack.
5255               (setq thread threads
5256                     gnus-tmp-header (caar thread))
5257             ;; There were no current threads, so we pop something off
5258             ;; the stack.
5259             (setq state (car stack)
5260                   gnus-tmp-level (car state)
5261                   tree-stack (cadr state)
5262                   thread (caddr state)
5263                   stack (cdr stack)
5264                   gnus-tmp-header (caar thread))))
5265
5266         (setq gnus-tmp-false-parent nil)
5267         (setq gnus-tmp-root-expunged nil)
5268         (setq thread-end nil)
5269
5270         (if (stringp gnus-tmp-header)
5271             ;; The header is a dummy root.
5272             (cond
5273              ((eq gnus-summary-make-false-root 'adopt)
5274               ;; We let the first article adopt the rest.
5275               (setq gnus-tmp-new-adopts (nconc gnus-tmp-new-adopts
5276                                                (cddar thread)))
5277               (setq gnus-tmp-gathered
5278                     (nconc (mapcar
5279                             (lambda (h) (mail-header-number (car h)))
5280                             (cddar thread))
5281                            gnus-tmp-gathered))
5282               (setq thread (cons (list (caar thread)
5283                                        (cadar thread))
5284                                  (cdr thread)))
5285               (setq gnus-tmp-level -1
5286                     gnus-tmp-false-parent t))
5287              ((eq gnus-summary-make-false-root 'empty)
5288               ;; We print adopted articles with empty subject fields.
5289               (setq gnus-tmp-gathered
5290                     (nconc (mapcar
5291                             (lambda (h) (mail-header-number (car h)))
5292                             (cddar thread))
5293                            gnus-tmp-gathered))
5294               (setq gnus-tmp-level -1))
5295              ((eq gnus-summary-make-false-root 'dummy)
5296               ;; We remember that we probably want to output a dummy
5297               ;; root.
5298               (setq gnus-tmp-dummy-line gnus-tmp-header)
5299               (setq gnus-tmp-prev-subject gnus-tmp-header))
5300              (t
5301               ;; We do not make a root for the gathered
5302               ;; sub-threads at all.
5303               (setq gnus-tmp-level -1)))
5304
5305           (setq number (mail-header-number gnus-tmp-header)
5306                 subject (mail-header-subject gnus-tmp-header)
5307                 simp-subject (gnus-simplify-subject-fully subject))
5308
5309           (cond
5310            ;; If the thread has changed subject, we might want to make
5311            ;; this subthread into a root.
5312            ((and (null gnus-thread-ignore-subject)
5313                  (not (zerop gnus-tmp-level))
5314                  gnus-tmp-prev-subject
5315                  (not (string= gnus-tmp-prev-subject simp-subject)))
5316             (setq new-roots (nconc new-roots (list (car thread)))
5317                   thread-end t
5318                   gnus-tmp-header nil))
5319            ;; If the article lies outside the current limit,
5320            ;; then we do not display it.
5321            ((not (memq number gnus-newsgroup-limit))
5322             (setq gnus-tmp-gathered
5323                   (nconc (mapcar
5324                           (lambda (h) (mail-header-number (car h)))
5325                           (cdar thread))
5326                          gnus-tmp-gathered))
5327             (setq gnus-tmp-new-adopts (if (cdar thread)
5328                                           (append gnus-tmp-new-adopts
5329                                                   (cdar thread))
5330                                         gnus-tmp-new-adopts)
5331                   thread-end t
5332                   gnus-tmp-header nil)
5333             (when (zerop gnus-tmp-level)
5334               (setq gnus-tmp-root-expunged t)))
5335            ;; Perhaps this article is to be marked as read?
5336            ((and gnus-summary-mark-below
5337                  (< (or (cdr (assq number gnus-newsgroup-scored))
5338                         default-score)
5339                     gnus-summary-mark-below)
5340                  ;; Don't touch sparse articles.
5341                  (not (gnus-summary-article-sparse-p number))
5342                  (not (gnus-summary-article-ancient-p number)))
5343             (setq gnus-newsgroup-unreads
5344                   (delq number gnus-newsgroup-unreads))
5345             (if gnus-newsgroup-auto-expire
5346                 (setq gnus-newsgroup-expirable
5347                       (gnus-add-to-sorted-list
5348                        gnus-newsgroup-expirable number))
5349               (push (cons number gnus-low-score-mark)
5350                     gnus-newsgroup-reads))))
5351
5352           (when gnus-tmp-header
5353             ;; We may have an old dummy line to output before this
5354             ;; article.
5355             (when (and gnus-tmp-dummy-line
5356                        (gnus-subject-equal
5357                         gnus-tmp-dummy-line
5358                         (mail-header-subject gnus-tmp-header)))
5359               (gnus-summary-insert-dummy-line
5360                gnus-tmp-dummy-line (mail-header-number gnus-tmp-header))
5361               (setq gnus-tmp-dummy-line nil))
5362
5363             ;; Compute the mark.
5364             (setq gnus-tmp-unread (gnus-article-mark number))
5365
5366             (push (gnus-data-make number gnus-tmp-unread (1+ (point))
5367                                   gnus-tmp-header gnus-tmp-level)
5368                   gnus-newsgroup-data)
5369
5370             ;; Actually insert the line.
5371             (setq
5372              gnus-tmp-subject-or-nil
5373              (cond
5374               ((and gnus-thread-ignore-subject
5375                     gnus-tmp-prev-subject
5376                     (not (string= gnus-tmp-prev-subject simp-subject)))
5377                subject)
5378               ((zerop gnus-tmp-level)
5379                (if (and (eq gnus-summary-make-false-root 'empty)
5380                         (memq number gnus-tmp-gathered)
5381                         gnus-tmp-prev-subject
5382                         (string= gnus-tmp-prev-subject simp-subject))
5383                    gnus-summary-same-subject
5384                  subject))
5385               (t gnus-summary-same-subject)))
5386             (if (and (eq gnus-summary-make-false-root 'adopt)
5387                      (= gnus-tmp-level 1)
5388                      (memq number gnus-tmp-gathered))
5389                 (setq gnus-tmp-opening-bracket ?\<
5390                       gnus-tmp-closing-bracket ?\>)
5391               (setq gnus-tmp-opening-bracket ?\[
5392                     gnus-tmp-closing-bracket ?\]))
5393             (if (>= gnus-tmp-level (length gnus-thread-indent-array))
5394                 (gnus-make-thread-indent-array
5395                  (max (* 2 (length gnus-thread-indent-array))
5396                       gnus-tmp-level)))
5397             (setq
5398              gnus-tmp-indentation
5399              (aref gnus-thread-indent-array gnus-tmp-level)
5400              gnus-tmp-lines (mail-header-lines gnus-tmp-header)
5401              gnus-tmp-score (or (cdr (assq number gnus-newsgroup-scored))
5402                                 gnus-summary-default-score 0)
5403              gnus-tmp-score-char
5404              (if (or (null gnus-summary-default-score)
5405                      (<= (abs (- gnus-tmp-score gnus-summary-default-score))
5406                          gnus-summary-zcore-fuzz))
5407                  ?                      ;Whitespace
5408                (if (< gnus-tmp-score gnus-summary-default-score)
5409                    gnus-score-below-mark gnus-score-over-mark))
5410              gnus-tmp-replied
5411              (cond ((memq number gnus-newsgroup-processable)
5412                     gnus-process-mark)
5413                    ((memq number gnus-newsgroup-cached)
5414                     gnus-cached-mark)
5415                    ((memq number gnus-newsgroup-replied)
5416                     gnus-replied-mark)
5417                    ((memq number gnus-newsgroup-forwarded)
5418                     gnus-forwarded-mark)
5419                    ((memq number gnus-newsgroup-saved)
5420                     gnus-saved-mark)
5421                    ((memq number gnus-newsgroup-unseen)
5422                     gnus-unseen-mark)
5423                    (t gnus-no-mark))
5424              gnus-tmp-downloaded
5425              (cond ((memq number gnus-newsgroup-undownloaded)
5426                     gnus-undownloaded-mark)
5427                    (gnus-newsgroup-agentized
5428                     gnus-downloaded-mark)
5429                    (t
5430                     gnus-no-mark))
5431              gnus-tmp-from (mail-header-from gnus-tmp-header)
5432              gnus-tmp-name
5433              (cond
5434               ((string-match "<[^>]+> *$" gnus-tmp-from)
5435                (setq beg-match (match-beginning 0))
5436                (or (and (string-match "^\".+\"" gnus-tmp-from)
5437                         (substring gnus-tmp-from 1 (1- (match-end 0))))
5438                    (substring gnus-tmp-from 0 beg-match)))
5439               ((string-match "(.+)" gnus-tmp-from)
5440                (substring gnus-tmp-from
5441                           (1+ (match-beginning 0)) (1- (match-end 0))))
5442               (t gnus-tmp-from))
5443
5444              ;; Do the %B string
5445              gnus-tmp-thread-tree-header-string
5446              (cond
5447               ((not gnus-show-threads) "")
5448               ((zerop gnus-tmp-level)
5449                (cond ((cdar thread)
5450                       (or gnus-sum-thread-tree-root subject))
5451                      (gnus-tmp-new-adopts
5452                       (or gnus-sum-thread-tree-false-root subject))
5453                      (t
5454                       (or gnus-sum-thread-tree-single-indent subject))))
5455               (t
5456                (concat (apply 'concat
5457                               (mapcar (lambda (item)
5458                                         (if (= item 1)
5459                                             gnus-sum-thread-tree-vertical
5460                                           gnus-sum-thread-tree-indent))
5461                                       (cdr (reverse tree-stack))))
5462                        (if (nth 1 thread)
5463                            gnus-sum-thread-tree-leaf-with-other
5464                          gnus-sum-thread-tree-single-leaf)))))
5465             (when (string= gnus-tmp-name "")
5466               (setq gnus-tmp-name gnus-tmp-from))
5467             (unless (numberp gnus-tmp-lines)
5468               (setq gnus-tmp-lines -1))
5469             (if (= gnus-tmp-lines -1)
5470                 (setq gnus-tmp-lines "?")
5471               (setq gnus-tmp-lines (number-to-string gnus-tmp-lines)))
5472             (gnus-put-text-property
5473              (point)
5474              (progn (eval gnus-summary-line-format-spec) (point))
5475              'gnus-number number)
5476             (when gnus-visual-p
5477               (forward-line -1)
5478               (gnus-summary-highlight-line)
5479               (when gnus-summary-update-hook
5480                 (gnus-run-hooks 'gnus-summary-update-hook))
5481               (forward-line 1))
5482
5483             (setq gnus-tmp-prev-subject simp-subject)))
5484
5485         (when (nth 1 thread)
5486           (push (list (max 0 gnus-tmp-level)
5487                       (copy-sequence tree-stack)
5488                       (nthcdr 1 thread))
5489                 stack))
5490         (push (if (nth 1 thread) 1 0) tree-stack)
5491         (incf gnus-tmp-level)
5492         (setq threads (if thread-end nil (cdar thread)))
5493         (if gnus-summary-display-while-building
5494             (if building-count
5495                 (progn
5496                   ;; use a set frequency
5497                   (setq building-line-count (1- building-line-count))
5498                   (when (= building-line-count 0)
5499                     (sit-for 0)
5500                     (setq building-line-count
5501                           gnus-summary-display-while-building)))
5502               ;; always
5503               (sit-for 0)))
5504         (unless threads
5505           (setq gnus-tmp-level 0)))))
5506   (gnus-message 7 "Generating summary...done"))
5507
5508 (defun gnus-summary-prepare-unthreaded (headers)
5509   "Generate an unthreaded summary buffer based on HEADERS."
5510   (let (header number mark)
5511
5512     (beginning-of-line)
5513
5514     (while headers
5515       ;; We may have to root out some bad articles...
5516       (when (memq (setq number (mail-header-number
5517                                 (setq header (pop headers))))
5518                   gnus-newsgroup-limit)
5519         ;; Mark article as read when it has a low score.
5520         (when (and gnus-summary-mark-below
5521                    (< (or (cdr (assq number gnus-newsgroup-scored))
5522                           gnus-summary-default-score 0)
5523                       gnus-summary-mark-below)
5524                    (not (gnus-summary-article-ancient-p number)))
5525           (setq gnus-newsgroup-unreads
5526                 (delq number gnus-newsgroup-unreads))
5527           (if gnus-newsgroup-auto-expire
5528               (push number gnus-newsgroup-expirable)
5529             (push (cons number gnus-low-score-mark)
5530                   gnus-newsgroup-reads)))
5531
5532         (setq mark (gnus-article-mark number))
5533         (push (gnus-data-make number mark (1+ (point)) header 0)
5534               gnus-newsgroup-data)
5535         (gnus-summary-insert-line
5536          header 0 number
5537          (memq number gnus-newsgroup-undownloaded)
5538          mark (memq number gnus-newsgroup-replied)
5539          (memq number gnus-newsgroup-expirable)
5540          (mail-header-subject header) nil
5541          (cdr (assq number gnus-newsgroup-scored))
5542          (memq number gnus-newsgroup-processable))))))
5543
5544 (declare-function gnus-parameter-list-identifier "gnus-art" (name) t)
5545
5546 (defun gnus-group-get-list-identifiers (group)
5547   "Get list identifier regexp for GROUP."
5548   (or (gnus-parameter-list-identifier group)
5549       (if (consp gnus-list-identifiers)
5550           (mapconcat 'identity gnus-list-identifiers " *\\|")
5551         gnus-list-identifiers)))
5552
5553 (defun gnus-summary-remove-list-identifiers ()
5554   "Remove list identifiers in `gnus-list-identifiers' from articles in the current group."
5555   (let ((regexp (gnus-group-get-list-identifiers gnus-newsgroup-name))
5556         changed subject)
5557     (when regexp
5558       (setq regexp (concat "^\\(?:R[Ee]: +\\)*\\(" regexp " *\\)"))
5559       (dolist (header gnus-newsgroup-headers)
5560         (setq subject (mail-header-subject header)
5561               changed nil)
5562         (while (string-match regexp subject)
5563           (setq subject
5564                 (concat (substring subject 0 (match-beginning 1))
5565                         (substring subject (match-end 0)))
5566                 changed t))
5567         (when changed
5568           (when (string-match "^\\(\\(?:R[Ee]: +\\)+\\)R[Ee]: +" subject)
5569             (setq subject
5570                   (concat (substring subject 0 (match-beginning 1))
5571                           (substring subject (match-end 1)))))
5572           (mail-header-set-subject header subject))))))
5573
5574 (defun gnus-fetch-headers (articles &optional limit force-new dependencies)
5575   "Fetch headers of ARTICLES."
5576   (let ((name (gnus-group-decoded-name gnus-newsgroup-name)))
5577     (gnus-message 7 "Fetching headers for %s..." name)
5578     (prog1
5579         (if (eq 'nov
5580                 (setq gnus-headers-retrieved-by
5581                       (gnus-retrieve-headers
5582                        articles gnus-newsgroup-name
5583                        (or limit
5584                            ;; We might want to fetch old headers, but
5585                            ;; not if there is only 1 article.
5586                            (and (or (and
5587                                      (not (eq gnus-fetch-old-headers 'some))
5588                                      (not (numberp gnus-fetch-old-headers)))
5589                                     (> (length articles) 1))
5590                                 gnus-fetch-old-headers)))))
5591             (gnus-get-newsgroup-headers-xover
5592              articles force-new dependencies gnus-newsgroup-name t)
5593           (gnus-get-newsgroup-headers dependencies force-new))
5594       (gnus-message 7 "Fetching headers for %s...done" name))))
5595
5596 (defun gnus-select-newsgroup (group &optional read-all select-articles)
5597   "Select newsgroup GROUP.
5598 If READ-ALL is non-nil, all articles in the group are selected.
5599 If SELECT-ARTICLES, only select those articles from GROUP."
5600   (let* ((entry (gnus-group-entry group))
5601          ;;!!! Dirty hack; should be removed.
5602          (gnus-summary-ignore-duplicates
5603           (if (eq (car (gnus-find-method-for-group group)) 'nnvirtual)
5604               t
5605             gnus-summary-ignore-duplicates))
5606          (info (nth 2 entry))
5607          charset articles fetched-articles cached)
5608
5609     (unless (gnus-check-server
5610              (set (make-local-variable 'gnus-current-select-method)
5611                   (gnus-find-method-for-group group)))
5612       (error "Couldn't open server"))
5613     (setq charset (gnus-group-name-charset gnus-current-select-method group))
5614
5615     (or (and entry (not (eq (car entry) t))) ; Either it's active...
5616         (gnus-activate-group group)     ; Or we can activate it...
5617         (progn                          ; Or we bug out.
5618           (when (derived-mode-p 'gnus-summary-mode)
5619             (gnus-kill-buffer (current-buffer)))
5620           (error
5621            "Couldn't activate group %s: %s"
5622            (mm-decode-coding-string group charset)
5623            (mm-decode-coding-string (gnus-status-message group) charset))))
5624
5625     (unless (gnus-request-group group t nil (gnus-get-info group))
5626       (when (derived-mode-p 'gnus-summary-mode)
5627         (gnus-kill-buffer (current-buffer)))
5628       (error "Couldn't request group %s: %s"
5629              (mm-decode-coding-string group charset)
5630              (mm-decode-coding-string (gnus-status-message group) charset)))
5631
5632     (when (and gnus-agent
5633                (gnus-active group))
5634       (gnus-agent-possibly-alter-active group (gnus-active group) info)
5635
5636       (setq gnus-summary-use-undownloaded-faces
5637             (gnus-agent-find-parameter
5638              group
5639              'agent-enable-undownloaded-faces)))
5640
5641     (setq gnus-newsgroup-name group
5642           gnus-newsgroup-unselected nil
5643           gnus-newsgroup-unreads (gnus-list-of-unread-articles group))
5644
5645     (let ((display (gnus-group-find-parameter group 'display)))
5646       (setq gnus-newsgroup-display
5647             (cond
5648              ((not (zerop (or (car-safe read-all) 0)))
5649               ;; The user entered the group with C-u SPC/RET, let's show
5650               ;; all articles.
5651               'gnus-not-ignore)
5652              ((eq display 'all)
5653               'gnus-not-ignore)
5654              ((arrayp display)
5655               (gnus-summary-display-make-predicate (mapcar 'identity display)))
5656              ((numberp display)
5657               ;; The following is probably the "correct" solution, but
5658               ;; it makes Gnus fetch all headers and then limit the
5659               ;; articles (which is slow), so instead we hack the
5660               ;; select-articles parameter instead. -- Simon Josefsson
5661               ;; <jas@kth.se>
5662               ;;
5663               ;; (gnus-byte-compile
5664               ;;  `(lambda () (> number ,(- (cdr (gnus-active group))
5665               ;;                         display)))))
5666               (setq select-articles
5667                     (gnus-uncompress-range
5668                      (cons (let ((tmp (- (cdr (gnus-active group)) display)))
5669                              (if (> tmp 0)
5670                                  tmp
5671                                1))
5672                            (cdr (gnus-active group)))))
5673               nil)
5674              (t
5675               nil))))
5676
5677     (gnus-summary-setup-default-charset)
5678
5679     ;; Kludge to avoid having cached articles nixed out in virtual groups.
5680     (when (gnus-virtual-group-p group)
5681       (setq cached gnus-newsgroup-cached))
5682
5683     (setq gnus-newsgroup-unreads
5684           (gnus-sorted-ndifference
5685            (gnus-sorted-ndifference gnus-newsgroup-unreads
5686                                     gnus-newsgroup-marked)
5687            gnus-newsgroup-dormant))
5688
5689     (setq gnus-newsgroup-processable nil)
5690
5691     (gnus-update-read-articles group gnus-newsgroup-unreads t)
5692
5693     ;; Adjust and set lists of article marks.
5694     (when info
5695       (gnus-adjust-marked-articles info))
5696     (if (setq articles select-articles)
5697         (setq gnus-newsgroup-unselected
5698               (gnus-sorted-difference gnus-newsgroup-unreads articles))
5699       (setq articles (gnus-articles-to-read group read-all)))
5700
5701     (cond
5702      ((null articles)
5703       ;;(gnus-message 3 "Couldn't select newsgroup -- no articles to display")
5704       'quit)
5705      ((eq articles 0) nil)
5706      (t
5707       ;; Init the dependencies hash table.
5708       (setq gnus-newsgroup-dependencies
5709             (gnus-make-hashtable (length articles)))
5710       (if (gnus-buffer-live-p gnus-group-buffer)
5711           (gnus-set-global-variables)
5712         (set-default 'gnus-newsgroup-name gnus-newsgroup-name))
5713       ;; Retrieve the headers and read them in.
5714
5715       (setq gnus-newsgroup-headers (gnus-fetch-headers articles))
5716
5717       ;; Kludge to avoid having cached articles nixed out in virtual groups.
5718       (when cached
5719         (setq gnus-newsgroup-cached cached))
5720
5721       ;; Suppress duplicates?
5722       (when gnus-suppress-duplicates
5723         (gnus-dup-suppress-articles))
5724
5725       ;; Set the initial limit.
5726       (setq gnus-newsgroup-limit (copy-sequence articles))
5727       ;; Remove canceled articles from the list of unread articles.
5728       (setq fetched-articles
5729             (mapcar (lambda (headers) (mail-header-number headers))
5730                     gnus-newsgroup-headers))
5731       (setq gnus-newsgroup-articles fetched-articles)
5732       (setq gnus-newsgroup-unreads
5733             (gnus-sorted-nintersection
5734              gnus-newsgroup-unreads fetched-articles))
5735       (gnus-compute-unseen-list)
5736
5737       ;; Removed marked articles that do not exist.
5738       (gnus-update-missing-marks
5739        (gnus-sorted-difference articles fetched-articles))
5740       ;; We might want to build some more threads first.
5741       (when (and gnus-fetch-old-headers
5742                  (eq gnus-headers-retrieved-by 'nov))
5743         (if (eq gnus-fetch-old-headers 'invisible)
5744             (gnus-build-all-threads)
5745           (gnus-build-old-threads)))
5746       ;; Let the Gnus agent mark articles as read.
5747       (when gnus-agent
5748         (gnus-agent-get-undownloaded-list))
5749       ;; Remove list identifiers from subject
5750       (gnus-summary-remove-list-identifiers)
5751       ;; Check whether auto-expire is to be done in this group.
5752       (setq gnus-newsgroup-auto-expire
5753             (and (gnus-group-auto-expirable-p group)
5754                  (not (gnus-group-read-only-p group))))
5755       ;; Set up the article buffer now, if necessary.
5756       (unless (and gnus-single-article-buffer
5757                    (equal gnus-article-buffer "*Article*"))
5758         (gnus-article-setup-buffer))
5759       ;; First and last article in this newsgroup.
5760       (when gnus-newsgroup-headers
5761         (setq gnus-newsgroup-begin
5762               (mail-header-number (car gnus-newsgroup-headers))
5763               gnus-newsgroup-end
5764               (mail-header-number
5765                (gnus-last-element gnus-newsgroup-headers))))
5766       ;; GROUP is successfully selected.
5767       (or gnus-newsgroup-headers t)))))
5768
5769 (defun gnus-compute-unseen-list ()
5770   ;; The `seen' marks are treated specially.
5771   (if (not gnus-newsgroup-seen)
5772       (setq gnus-newsgroup-unseen gnus-newsgroup-articles)
5773     (setq gnus-newsgroup-unseen
5774           (gnus-inverse-list-range-intersection
5775            gnus-newsgroup-articles gnus-newsgroup-seen))))
5776
5777 (declare-function gnus-get-predicate "gnus-agent" (predicate))
5778
5779 (defun gnus-summary-display-make-predicate (display)
5780   (require 'gnus-agent)
5781   (when (= (length display) 1)
5782     (setq display (car display)))
5783   (unless gnus-summary-display-cache
5784     (dolist (elem (append '((unread . unread)
5785                             (read . read)
5786                             (unseen . unseen))
5787                           gnus-article-mark-lists))
5788       (push (cons (cdr elem)
5789                   (gnus-byte-compile    ;Why bother?
5790                    `(lambda () (gnus-article-marked-p ',(cdr elem)))))
5791             gnus-summary-display-cache)))
5792   (let ((gnus-category-predicate-alist gnus-summary-display-cache)
5793         (gnus-category-predicate-cache gnus-summary-display-cache))
5794     (gnus-get-predicate display)))
5795
5796 ;; Uses the dynamically bound `gnus-number' variable.
5797 (defvar gnus-number)
5798 (defun gnus-article-marked-p (type &optional article)
5799   (let ((article (or article gnus-number)))
5800     (cond
5801      ((eq type 'tick)
5802       (memq article gnus-newsgroup-marked))
5803      ((eq type 'spam)
5804       (memq article gnus-newsgroup-spam-marked))
5805      ((eq type 'unsend)
5806       (memq article gnus-newsgroup-unsendable))
5807      ((eq type 'undownload)
5808       (memq article gnus-newsgroup-undownloaded))
5809      ((eq type 'download)
5810       (memq article gnus-newsgroup-downloadable))
5811      ((eq type 'unread)
5812       (memq article gnus-newsgroup-unreads))
5813      ((eq type 'read)
5814       (memq article gnus-newsgroup-reads))
5815      ((eq type 'dormant)
5816       (memq article gnus-newsgroup-dormant) )
5817      ((eq type 'expire)
5818       (memq article gnus-newsgroup-expirable))
5819      ((eq type 'reply)
5820       (memq article gnus-newsgroup-replied))
5821      ((eq type 'killed)
5822       (memq article gnus-newsgroup-killed))
5823      ((eq type 'bookmark)
5824       (assq article gnus-newsgroup-bookmarks))
5825      ((eq type 'score)
5826       (assq article gnus-newsgroup-scored))
5827      ((eq type 'save)
5828       (memq article gnus-newsgroup-saved))
5829      ((eq type 'cache)
5830       (memq article gnus-newsgroup-cached))
5831      ((eq type 'forward)
5832       (memq article gnus-newsgroup-forwarded))
5833      ((eq type 'seen)
5834       (not (memq article gnus-newsgroup-unseen)))
5835      (t t))))
5836
5837 (defun gnus-articles-to-read (group &optional read-all)
5838   "Find out what articles the user wants to read."
5839   (let* ((only-read-p t)
5840          (articles
5841           (gnus-list-range-difference
5842           ;; Select all articles if `read-all' is non-nil, or if there
5843           ;; are no unread articles.
5844           (if (or read-all
5845                   (and (zerop (length gnus-newsgroup-marked))
5846                        (zerop (length gnus-newsgroup-unreads)))
5847                   ;; Fetch all if the predicate is non-nil.
5848                   gnus-newsgroup-display)
5849               ;; We want to select the headers for all the articles in
5850               ;; the group, so we select either all the active
5851               ;; articles in the group, or (if that's nil), the
5852               ;; articles in the cache.
5853               (or
5854                (if gnus-newsgroup-maximum-articles
5855                    (let ((active (gnus-active group)))
5856                      (gnus-uncompress-range
5857                       (cons (max (car active)
5858                                  (- (cdr active)
5859                                     gnus-newsgroup-maximum-articles
5860                                     -1))
5861                             (cdr active))))
5862                  (gnus-uncompress-range (gnus-active group)))
5863                (gnus-cache-articles-in-group group))
5864             ;; Select only the "normal" subset of articles.
5865             (setq only-read-p nil)
5866             (gnus-sorted-nunion
5867              (gnus-sorted-union gnus-newsgroup-dormant gnus-newsgroup-marked)
5868              gnus-newsgroup-unreads))
5869           (cdr (assq 'unexist (gnus-info-marks (gnus-get-info group))))))
5870          (scored-list (gnus-killed-articles gnus-newsgroup-killed articles))
5871          (scored (length scored-list))
5872          (number (length articles))
5873          (marked (+ (length gnus-newsgroup-marked)
5874                     (length gnus-newsgroup-dormant)))
5875          (select
5876           (cond
5877            ((numberp read-all)
5878             read-all)
5879            ((numberp gnus-newsgroup-display)
5880             gnus-newsgroup-display)
5881            (t
5882             (condition-case ()
5883                 (cond
5884                  ((and (or (<= scored marked) (= scored number))
5885                        (numberp gnus-large-newsgroup)
5886                        (> number gnus-large-newsgroup))
5887                   (let* ((cursor-in-echo-area nil)
5888                          (initial (gnus-parameter-large-newsgroup-initial
5889                                    gnus-newsgroup-name))
5890                          (default (if only-read-p
5891                                       (or initial gnus-large-newsgroup)
5892                                     number))
5893                          (input
5894                           (read-string
5895                            (if only-read-p
5896                                (format
5897                                 "How many articles from %s (available %d, default %d): "
5898                                 (gnus-group-decoded-name
5899                                  (gnus-group-real-name gnus-newsgroup-name))
5900                                 number default)
5901                              (format
5902                               "How many articles from %s (%d default): "
5903                               (gnus-group-decoded-name
5904                                (gnus-group-real-name gnus-newsgroup-name))
5905                               default))
5906                            nil
5907                            nil
5908                            (number-to-string default))))
5909                     (if (string-match "^[ \t]*$" input) number input)))
5910                  ((and (> scored marked) (< scored number)
5911                        (> (- scored number) 20))
5912                   (let ((input
5913                          (read-string
5914                           (format "%s %s (%d scored, %d total): "
5915                                   "How many articles from"
5916                                   (gnus-group-decoded-name
5917                                    (gnus-group-real-name gnus-newsgroup-name))
5918                                   scored number))))
5919                     (if (string-match "^[ \t]*$" input)
5920                         number input)))
5921                  (t number))
5922               (quit
5923                (message "Quit getting the articles to read")
5924                nil))))))
5925     (setq select (if (stringp select) (string-to-number select) select))
5926     (if (or (null select) (zerop select))
5927         select
5928       (if (and (not (zerop scored)) (<= (abs select) scored))
5929           (progn
5930             (setq articles (sort scored-list '<))
5931             (setq number (length articles)))
5932         (setq articles (copy-sequence articles)))
5933
5934       (when (< (abs select) number)
5935         (if (< select 0)
5936             ;; Select the N oldest articles.
5937             (setcdr (nthcdr (1- (abs select)) articles) nil)
5938           ;; Select the N most recent articles.
5939           (setq articles (nthcdr (- number select) articles))))
5940       (setq gnus-newsgroup-unselected
5941             (gnus-sorted-difference gnus-newsgroup-unreads articles))
5942       (when gnus-alter-articles-to-read-function
5943         (setq articles
5944               (sort
5945                (funcall gnus-alter-articles-to-read-function
5946                         gnus-newsgroup-name articles)
5947                '<)))
5948       articles)))
5949
5950 (defun gnus-killed-articles (killed articles)
5951   (let (out)
5952     (while articles
5953       (when (inline (gnus-member-of-range (car articles) killed))
5954         (push (car articles) out))
5955       (setq articles (cdr articles)))
5956     out))
5957
5958 (defun gnus-article-mark-to-type (mark)
5959   "Return the type of MARK."
5960   (or (cadr (assq mark gnus-article-special-mark-lists))
5961       'list))
5962
5963 (defun gnus-article-unpropagatable-p (mark)
5964   "Return whether MARK should be propagated to back end."
5965   (memq mark gnus-article-unpropagated-mark-lists))
5966
5967 (defun gnus-adjust-marked-articles (info)
5968   "Set all article lists and remove all marks that are no longer valid."
5969   (let* ((marked-lists (gnus-info-marks info))
5970          (active (gnus-active (gnus-info-group info)))
5971          (min (car active))
5972          (max (cdr active))
5973          (types gnus-article-mark-lists)
5974          marks var articles article mark mark-type
5975          bgn end)
5976     ;; Hack to avoid adjusting marks for imap.
5977     (when (eq (car (gnus-find-method-for-group (gnus-info-group info)))
5978               'nnimap)
5979       (setq min 1))
5980
5981     (dolist (marks marked-lists)
5982       (setq mark (car marks)
5983             mark-type (gnus-article-mark-to-type mark)
5984             var (intern (format "gnus-newsgroup-%s" (car (rassq mark types)))))
5985       ;; We set the variable according to the type of the marks list,
5986       ;; and then adjust the marks to a subset of the active articles.
5987       (cond
5988        ;; Adjust "simple" lists - compressed yet unsorted
5989        ((eq mark-type 'list)
5990         ;; Simultaneously uncompress and clip to active range
5991         ;; See gnus-uncompress-range for a description of possible marks
5992         (let (l lh)
5993           (if (not (cadr marks))
5994               (set var nil)
5995             (setq articles (if (numberp (cddr marks))
5996                                (list (cdr marks))
5997                              (cdr marks))
5998                   lh (cons nil nil)
5999                   l lh)
6000
6001             (while (setq article (pop articles))
6002               (cond ((consp article)
6003                      (setq bgn (max (car article) min)
6004                            end (min (cdr article) max))
6005                      (while (<= bgn end)
6006                        (setq l (setcdr l (cons bgn nil))
6007                              bgn (1+ bgn))))
6008                     ((and (<= min article)
6009                           (>= max article))
6010                      (setq l (setcdr l (cons article nil))))))
6011             (set var (cdr lh)))))
6012        ;; Adjust assocs.
6013        ((eq mark-type 'tuple)
6014         (set var (setq articles (cdr marks)))
6015         (when (not (listp (cdr (symbol-value var))))
6016           (set var (list (symbol-value var))))
6017         (when (not (listp (cdr articles)))
6018           (setq articles (list articles)))
6019         (while articles
6020           (when (or (not (consp (setq article (pop articles))))
6021                     (< (car article) min)
6022                     (> (car article) max))
6023             (set var (delq article (symbol-value var))))))
6024        ;; Adjust ranges (sloppily).
6025        ((eq mark-type 'range)
6026         (cond
6027          ((eq mark 'seen)
6028           ;; Fix the record for `seen' if it looks like (seen NUM1 . NUM2).
6029           ;; It should be (seen (NUM1 . NUM2)).
6030           (when (numberp (cddr marks))
6031             (setcdr marks (list (cdr marks))))
6032           (setq articles (cdr marks))
6033           (while (and articles
6034                       (or (and (consp (car articles))
6035                                (> min (cdar articles)))
6036                           (and (numberp (car articles))
6037                                (> min (car articles)))))
6038             (pop articles))
6039           (set var articles))
6040          ((eq mark 'unexist)
6041           (set var (cdr marks)))))))))
6042
6043 (defun gnus-update-missing-marks (missing)
6044   "Go through the list of MISSING articles and remove them from the mark lists."
6045   (when missing
6046     (let (var m)
6047       ;; Go through all types.
6048       (dolist (elem gnus-article-mark-lists)
6049         (when (eq (gnus-article-mark-to-type (cdr elem)) 'list)
6050           (setq var (intern (format "gnus-newsgroup-%s" (car elem))))
6051           (when (symbol-value var)
6052             ;; This list has articles.  So we delete all missing
6053             ;; articles from it.
6054             (setq m missing)
6055             (while m
6056               (set var (delq (pop m) (symbol-value var))))))))))
6057
6058 (defun gnus-update-marks ()
6059   "Enter the various lists of marked articles into the newsgroup info list."
6060   (let ((types gnus-article-mark-lists)
6061         (info (gnus-get-info gnus-newsgroup-name))
6062         type list newmarked symbol delta-marks)
6063     (when info
6064       ;; Add all marks lists to the list of marks lists.
6065       (while (setq type (pop types))
6066         (setq list (symbol-value
6067                     (setq symbol
6068                           (intern (format "gnus-newsgroup-%s" (car type))))))
6069
6070         (when list
6071           ;; Get rid of the entries of the articles that have the
6072           ;; default score.
6073           (when (and (eq (cdr type) 'score)
6074                      gnus-save-score
6075                      list)
6076             (let* ((arts list)
6077                    (prev (cons nil list))
6078                    (all prev))
6079               (while arts
6080                 (if (or (not (consp (car arts)))
6081                         (= (cdar arts) gnus-summary-default-score))
6082                     (setcdr prev (cdr arts))
6083                   (setq prev arts))
6084                 (setq arts (cdr arts)))
6085               (setq list (cdr all)))))
6086
6087         (when (eq (cdr type) 'seen)
6088           (setq list (gnus-range-add list gnus-newsgroup-unseen)))
6089
6090         (when (eq (gnus-article-mark-to-type (cdr type)) 'list)
6091           (setq list (gnus-compress-sequence (set symbol (sort list '<)) t)))
6092
6093         (when (and (gnus-check-backend-function
6094                     'request-set-mark gnus-newsgroup-name)
6095                    (not (gnus-article-unpropagatable-p (cdr type))))
6096           (let* ((old (cdr (assq (cdr type) (gnus-info-marks info))))
6097                  ;; Don't do anything about marks for articles we
6098                  ;; didn't actually get any headers for.
6099                  (del
6100                   (gnus-list-range-intersection
6101                    gnus-newsgroup-articles
6102                    (gnus-remove-from-range (gnus-copy-sequence old) list)))
6103                  (add
6104                   (gnus-list-range-intersection
6105                    gnus-newsgroup-articles
6106                    (gnus-remove-from-range
6107                     (gnus-copy-sequence list) old))))
6108             (when add
6109               (push (list add 'add (list (cdr type))) delta-marks))
6110             (when del
6111               ;; Don't delete marks from outside the active range.
6112               ;; This shouldn't happen, but is a sanity check.
6113               (setq del (gnus-sorted-range-intersection
6114                          (gnus-active gnus-newsgroup-name) del))
6115               (push (list del 'del (list (cdr type))) delta-marks))))
6116
6117         (when (or list
6118                   (eq (cdr type) 'unexist))
6119           (push (cons (cdr type) list) newmarked)))
6120
6121       (when delta-marks
6122         (unless (gnus-check-group gnus-newsgroup-name)
6123           (error "Can't open server for %s" gnus-newsgroup-name))
6124         (gnus-request-set-mark gnus-newsgroup-name delta-marks))
6125
6126       ;; Enter these new marks into the info of the group.
6127       (if (nthcdr 3 info)
6128           (setcar (nthcdr 3 info) newmarked)
6129         ;; Add the marks lists to the end of the info.
6130         (when newmarked
6131           (setcdr (nthcdr 2 info) (list newmarked))))
6132
6133       ;; Cut off the end of the info if there's nothing else there.
6134       (let ((i 5))
6135         (while (and (> i 2)
6136                     (not (nth i info)))
6137           (when (nthcdr (decf i) info)
6138             (setcdr (nthcdr i info) nil)))))))
6139
6140 (defun gnus-set-mode-line (where)
6141   "Set the mode line of the article or summary buffers.
6142 If WHERE is `summary', the summary mode line format will be used."
6143   ;; Is this mode line one we keep updated?
6144   (when (and (memq where gnus-updated-mode-lines)
6145              (symbol-value
6146               (intern (format "gnus-%s-mode-line-format-spec" where))))
6147     (let (mode-string)
6148       ;; We evaluate this in the summary buffer since these
6149       ;; variables are buffer-local to that buffer.
6150       (with-current-buffer gnus-summary-buffer
6151         ;; We bind all these variables that are used in the `eval' form
6152         ;; below.
6153         (let* ((mformat (symbol-value
6154                          (intern
6155                           (format "gnus-%s-mode-line-format-spec" where))))
6156                (gnus-tmp-group-name (gnus-mode-string-quote
6157                                      (gnus-group-decoded-name
6158                                       gnus-newsgroup-name)))
6159                (gnus-tmp-article-number (or gnus-current-article 0))
6160                (gnus-tmp-unread gnus-newsgroup-unreads)
6161                (gnus-tmp-unread-and-unticked (length gnus-newsgroup-unreads))
6162                (gnus-tmp-unselected (length gnus-newsgroup-unselected))
6163                (gnus-tmp-unread-and-unselected
6164                 (cond ((and (zerop gnus-tmp-unread-and-unticked)
6165                             (zerop gnus-tmp-unselected))
6166                        "")
6167                       ((zerop gnus-tmp-unselected)
6168                        (format "{%d more}" gnus-tmp-unread-and-unticked))
6169                       (t (format "{%d(+%d) more}"
6170                                  gnus-tmp-unread-and-unticked
6171                                  gnus-tmp-unselected))))
6172                (gnus-tmp-subject
6173                 (if (and gnus-current-headers
6174                          (vectorp gnus-current-headers))
6175                     (gnus-mode-string-quote
6176                      (mail-header-subject gnus-current-headers))
6177                   ""))
6178                bufname-length max-len
6179                gnus-tmp-header) ;; passed as argument to any user-format-funcs
6180           (setq mode-string (eval mformat))
6181           (setq bufname-length (if (string-match "%b" mode-string)
6182                                    (- (length
6183                                        (buffer-name
6184                                         (if (eq where 'summary)
6185                                             nil
6186                                           (get-buffer gnus-article-buffer))))
6187                                       2)
6188                                  0))
6189           (setq max-len (max 4 (if gnus-mode-non-string-length
6190                                    (- (window-width)
6191                                       gnus-mode-non-string-length
6192                                       bufname-length)
6193                                  (length mode-string))))
6194           ;; We might have to chop a bit of the string off...
6195           (when (> (length mode-string) max-len)
6196             (setq mode-string
6197                   (concat (truncate-string-to-width mode-string (- max-len 3))
6198                           "...")))))
6199       ;; Update the mode line.
6200       (setq mode-line-buffer-identification
6201             (gnus-mode-line-buffer-identification (list mode-string)))
6202       (set-buffer-modified-p t))))
6203
6204 (defun gnus-create-xref-hashtb (from-newsgroup headers unreads)
6205   "Go through the HEADERS list and add all Xrefs to a hash table.
6206 The resulting hash table is returned, or nil if no Xrefs were found."
6207   (let* ((virtual (gnus-virtual-group-p from-newsgroup))
6208          (prefix (if virtual "" (gnus-group-real-prefix from-newsgroup)))
6209          (xref-hashtb (gnus-make-hashtable))
6210          start group entry number xrefs header)
6211     (while headers
6212       (setq header (pop headers))
6213       (when (and (setq xrefs (mail-header-xref header))
6214                  (not (memq (setq number (mail-header-number header))
6215                             unreads)))
6216         (setq start 0)
6217         (while (string-match "\\([^ ]+\\)[:/]\\([0-9]+\\)" xrefs start)
6218           (setq start (match-end 0))
6219           (setq group (if prefix
6220                           (concat prefix (substring xrefs (match-beginning 1)
6221                                                     (match-end 1)))
6222                         (substring xrefs (match-beginning 1) (match-end 1))))
6223           (setq number
6224                 (string-to-number (substring xrefs (match-beginning 2)
6225                                           (match-end 2))))
6226           (if (setq entry (gnus-gethash group xref-hashtb))
6227               (setcdr entry (cons number (cdr entry)))
6228             (gnus-sethash group (cons number nil) xref-hashtb)))))
6229     (and start xref-hashtb)))
6230
6231 (defun gnus-mark-xrefs-as-read (from-newsgroup headers unreads)
6232   "Look through all the headers and mark the Xrefs as read."
6233   (let ((virtual (gnus-virtual-group-p from-newsgroup))
6234         name info xref-hashtb idlist method nth4)
6235     (with-current-buffer gnus-group-buffer
6236       (when (setq xref-hashtb
6237                   (gnus-create-xref-hashtb from-newsgroup headers unreads))
6238         (mapatoms
6239          (lambda (group)
6240            (unless (string= from-newsgroup (setq name (symbol-name group)))
6241              (setq idlist (symbol-value group))
6242              ;; Dead groups are not updated.
6243              (and (prog1
6244                       (setq info (gnus-get-info name))
6245                     (when (stringp (setq nth4 (gnus-info-method info)))
6246                       (setq nth4 (gnus-server-to-method nth4))))
6247                   ;; Only do the xrefs if the group has the same
6248                   ;; select method as the group we have just read.
6249                   (or (gnus-methods-equal-p
6250                        nth4 (gnus-find-method-for-group from-newsgroup))
6251                       virtual
6252                       (equal nth4 (setq method (gnus-find-method-for-group
6253                                                 from-newsgroup)))
6254                       (and (equal (car nth4) (car method))
6255                            (equal (nth 1 nth4) (nth 1 method))))
6256                   gnus-use-cross-reference
6257                   (or (not (eq gnus-use-cross-reference t))
6258                       virtual
6259                       ;; Only do cross-references on subscribed
6260                       ;; groups, if that is what is wanted.
6261                       (<= (gnus-info-level info) gnus-level-subscribed))
6262                   (gnus-group-make-articles-read name idlist))))
6263          xref-hashtb)))))
6264
6265 (defun gnus-compute-read-articles (group articles)
6266   (let* ((entry (gnus-group-entry group))
6267          (info (nth 2 entry))
6268          (active (gnus-active group))
6269          ninfo)
6270     (when entry
6271       ;; First peel off all invalid article numbers.
6272       (when active
6273         (let ((ids articles)
6274               id first)
6275           (while (setq id (pop ids))
6276             (when (and first (> id (cdr active)))
6277               ;; We'll end up in this situation in one particular
6278               ;; obscure situation.  If you re-scan a group and get
6279               ;; a new article that is cross-posted to a different
6280               ;; group that has not been re-scanned, you might get
6281               ;; crossposted article that has a higher number than
6282               ;; Gnus believes possible.  So we re-activate this
6283               ;; group as well.  This might mean doing the
6284               ;; crossposting thingy will *increase* the number
6285               ;; of articles in some groups.  Tsk, tsk.
6286               (setq active (or (gnus-activate-group group) active)))
6287             (when (or (> id (cdr active))
6288                       (< id (car active)))
6289               (setq articles (delq id articles))))))
6290       ;; If the read list is nil, we init it.
6291       (if (and active
6292                (null (gnus-info-read info))
6293                (> (car active) 1))
6294           (setq ninfo (cons 1 (1- (car active))))
6295         (setq ninfo (gnus-info-read info)))
6296       ;; Then we add the read articles to the range.
6297       (gnus-add-to-range
6298        ninfo (setq articles (sort articles '<))))))
6299
6300 (defun gnus-group-make-articles-read (group articles)
6301   "Update the info of GROUP to say that ARTICLES are read."
6302   (let* ((num 0)
6303          (entry (gnus-group-entry group))
6304          (info (nth 2 entry))
6305          (active (gnus-active group))
6306          (set-marks
6307           (gnus-method-option-p
6308            (gnus-find-method-for-group group)
6309            'server-marks))
6310          range)
6311     (if (not entry)
6312         ;; Group that Gnus doesn't know exists, but still allow the
6313         ;; backend to set marks.
6314         (when set-marks
6315           (gnus-request-set-mark
6316            group (list (list (gnus-compress-sequence (sort articles #'<))
6317                              'add '(read)))))
6318       ;; Normal, subscribed groups.
6319       (setq range (gnus-compute-read-articles group articles))
6320       (with-current-buffer gnus-group-buffer
6321         (gnus-undo-register
6322           `(progn
6323              (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
6324              (gnus-info-set-read ',info ',(gnus-info-read info))
6325              (gnus-get-unread-articles-in-group ',info (gnus-active ,group))
6326              (when ,set-marks
6327                (gnus-request-set-mark
6328                 ,group (list (list ',range 'del '(read)))))
6329              (gnus-group-update-group ,group t))))
6330       ;; Add the read articles to the range.
6331       (gnus-info-set-read info range)
6332       (when set-marks
6333         (gnus-request-set-mark group (list (list range 'add '(read)))))
6334       ;; Then we have to re-compute how many unread
6335       ;; articles there are in this group.
6336       (when active
6337         (cond
6338          ((not range)
6339           (setq num (- (1+ (cdr active)) (car active))))
6340          ((not (listp (cdr range)))
6341           (setq num (- (cdr active) (- (1+ (cdr range))
6342                                        (car range)))))
6343          (t
6344           (while range
6345             (if (numberp (car range))
6346                 (setq num (1+ num))
6347               (setq num (+ num (- (1+ (cdar range)) (caar range)))))
6348             (setq range (cdr range)))
6349           (setq num (- (cdr active) num))))
6350         ;; Update the number of unread articles.
6351         (setcar entry num)
6352         ;; Update the group buffer.
6353         (unless (gnus-ephemeral-group-p group)
6354           (gnus-group-update-group group t))))))
6355
6356 (defun gnus-get-newsgroup-headers (&optional dependencies force-new)
6357   (let ((cur nntp-server-buffer)
6358         (dependencies
6359          (or dependencies
6360              (with-current-buffer gnus-summary-buffer
6361                gnus-newsgroup-dependencies)))
6362         headers id end ref number
6363         (mail-parse-charset gnus-newsgroup-charset)
6364         (mail-parse-ignored-charsets
6365          (save-current-buffer (condition-case nil
6366                                   (set-buffer gnus-summary-buffer)
6367                                 (error))
6368                               gnus-newsgroup-ignored-charsets)))
6369     (with-current-buffer nntp-server-buffer
6370       ;; Translate all TAB characters into SPACE characters.
6371       (subst-char-in-region (point-min) (point-max) ?\t ?  t)
6372       (subst-char-in-region (point-min) (point-max) ?\r ?  t)
6373       (ietf-drums-unfold-fws)
6374       (gnus-run-hooks 'gnus-parse-headers-hook)
6375       (let ((case-fold-search t)
6376             in-reply-to header p lines chars)
6377         (goto-char (point-min))
6378         ;; Search to the beginning of the next header.  Error messages
6379         ;; do not begin with 2 or 3.
6380         (while (re-search-forward "^[23][0-9]+ " nil t)
6381           (setq id nil
6382                 ref nil)
6383           ;; This implementation of this function, with nine
6384           ;; search-forwards instead of the one re-search-forward and
6385           ;; a case (which basically was the old function) is actually
6386           ;; about twice as fast, even though it looks messier.  You
6387           ;; can't have everything, I guess.  Speed and elegance
6388           ;; doesn't always go hand in hand.
6389           (setq
6390            header
6391            (vector
6392             ;; Number.
6393             (prog1
6394                 (setq number (read cur))
6395               (end-of-line)
6396               (setq p (point))
6397               (narrow-to-region (point)
6398                                 (or (and (search-forward "\n.\n" nil t)
6399                                          (- (point) 2))
6400                                     (point))))
6401             ;; Subject.
6402             (progn
6403               (goto-char p)
6404               (if (search-forward "\nsubject:" nil t)
6405                   (funcall gnus-decode-encoded-word-function
6406                            (nnheader-header-value))
6407                 "(none)"))
6408             ;; From.
6409             (progn
6410               (goto-char p)
6411               (if (search-forward "\nfrom:" nil t)
6412                   (funcall gnus-decode-encoded-address-function
6413                            (nnheader-header-value))
6414                 "(nobody)"))
6415             ;; Date.
6416             (progn
6417               (goto-char p)
6418               (if (search-forward "\ndate:" nil t)
6419                   (nnheader-header-value) ""))
6420             ;; Message-ID.
6421             (progn
6422               (goto-char p)
6423               (setq id (if (re-search-forward
6424                             "^message-id: *\\(<[^\n\t> ]+>\\)" nil t)
6425                            ;; We do it this way to make sure the Message-ID
6426                            ;; is (somewhat) syntactically valid.
6427                            (buffer-substring (match-beginning 1)
6428                                              (match-end 1))
6429                          ;; If there was no message-id, we just fake one
6430                          ;; to make subsequent routines simpler.
6431                          (nnheader-generate-fake-message-id number))))
6432             ;; References.
6433             (progn
6434               (goto-char p)
6435               (if (search-forward "\nreferences:" nil t)
6436                   (progn
6437                     (setq end (point))
6438                     (prog1
6439                         (nnheader-header-value)
6440                       (setq ref
6441                             (buffer-substring
6442                              (progn
6443                                (end-of-line)
6444                                (search-backward ">" end t)
6445                                (1+ (point)))
6446                              (progn
6447                                (search-backward "<" end t)
6448                                (point))))))
6449                 ;; Get the references from the in-reply-to header if there
6450                 ;; were no references and the in-reply-to header looks
6451                 ;; promising.
6452                 (if (and (search-forward "\nin-reply-to:" nil t)
6453                          (setq in-reply-to (nnheader-header-value))
6454                          (string-match "<[^>]+>" in-reply-to))
6455                     (let (ref2)
6456                       (setq ref (substring in-reply-to (match-beginning 0)
6457                                            (match-end 0)))
6458                       (while (string-match "<[^>]+>" in-reply-to (match-end 0))
6459                         (setq ref2 (substring in-reply-to (match-beginning 0)
6460                                               (match-end 0)))
6461                         (when (> (length ref2) (length ref))
6462                           (setq ref ref2)))
6463                       ref)
6464                   (setq ref nil))))
6465             ;; Chars.
6466             (progn
6467               (goto-char p)
6468               (if (search-forward "\nchars: " nil t)
6469                   (if (numberp (setq chars (ignore-errors (read cur))))
6470                       chars -1)
6471                 -1))
6472             ;; Lines.
6473             (progn
6474               (goto-char p)
6475               (if (search-forward "\nlines: " nil t)
6476                   (if (numberp (setq lines (ignore-errors (read cur))))
6477                       lines -1)
6478                 -1))
6479             ;; Xref.
6480             (progn
6481               (goto-char p)
6482               (and (search-forward "\nxref:" nil t)
6483                    (nnheader-header-value)))
6484             ;; Extra.
6485             (when gnus-extra-headers
6486               (let ((extra gnus-extra-headers)
6487                     out)
6488                 (while extra
6489                   (goto-char p)
6490                   (when (search-forward
6491                          (concat "\n" (symbol-name (car extra)) ":") nil t)
6492                     (push (cons (car extra) (nnheader-header-value))
6493                           out))
6494                   (pop extra))
6495                 out))))
6496           (when (equal id ref)
6497             (setq ref nil))
6498
6499           (when gnus-alter-header-function
6500             (funcall gnus-alter-header-function header)
6501             (setq id (mail-header-id header)
6502                   ref (gnus-parent-id (mail-header-references header))))
6503
6504           (when (setq header
6505                       (gnus-dependencies-add-header
6506                        header dependencies force-new))
6507             (push header headers))
6508           (goto-char (point-max))
6509           (widen))
6510         (nreverse headers)))))
6511
6512 ;; Goes through the xover lines and returns a list of vectors
6513 (defun gnus-get-newsgroup-headers-xover (sequence &optional
6514                                                   force-new dependencies
6515                                                   group also-fetch-heads)
6516   "Parse the news overview data in the server buffer.
6517 Return a list of headers that match SEQUENCE (see
6518 `nntp-retrieve-headers')."
6519   ;; Get the Xref when the users reads the articles since most/some
6520   ;; NNTP servers do not include Xrefs when using XOVER.
6521   (setq gnus-article-internal-prepare-hook '(gnus-article-get-xrefs))
6522   (let ((mail-parse-charset gnus-newsgroup-charset)
6523         (mail-parse-ignored-charsets gnus-newsgroup-ignored-charsets)
6524         (cur nntp-server-buffer)
6525         (dependencies (or dependencies gnus-newsgroup-dependencies))
6526         (allp (cond
6527                ((eq gnus-read-all-available-headers t)
6528                 t)
6529                ((and (stringp gnus-read-all-available-headers)
6530                      group)
6531                 (string-match gnus-read-all-available-headers group))
6532                (t
6533                 nil)))
6534         number headers header)
6535     (with-current-buffer nntp-server-buffer
6536       (subst-char-in-region (point-min) (point-max) ?\r ?  t)
6537       ;; Allow the user to mangle the headers before parsing them.
6538       (gnus-run-hooks 'gnus-parse-headers-hook)
6539       (goto-char (point-min))
6540       (gnus-parse-without-error
6541         (while (and (or sequence allp)
6542                     (not (eobp)))
6543           (setq number (read cur))
6544           (when (not allp)
6545             (while (and sequence
6546                         (< (car sequence) number))
6547               (setq sequence (cdr sequence))))
6548           (when (and (or allp
6549                          (and sequence
6550                               (eq number (car sequence))))
6551                      (progn
6552                        (setq sequence (cdr sequence))
6553                        (setq header (inline
6554                                       (gnus-nov-parse-line
6555                                        number dependencies force-new)))))
6556             (push header headers))
6557           (forward-line 1)))
6558       ;; A common bug in inn is that if you have posted an article and
6559       ;; then retrieves the active file, it will answer correctly --
6560       ;; the new article is included.  However, a NOV entry for the
6561       ;; article may not have been generated yet, so this may fail.
6562       ;; We work around this problem by retrieving the last few
6563       ;; headers using HEAD.
6564       (if (or (not also-fetch-heads)
6565               (not sequence))
6566           ;; We (probably) got all the headers.
6567           (nreverse headers)
6568         (let ((gnus-nov-is-evil t))
6569           (nconc
6570            (nreverse headers)
6571            (when (eq (gnus-retrieve-headers sequence group) 'headers)
6572              (gnus-get-newsgroup-headers))))))))
6573
6574 (defun gnus-article-get-xrefs ()
6575   "Fill in the Xref value in `gnus-current-headers', if necessary.
6576 This is meant to be called in `gnus-article-internal-prepare-hook'."
6577   (let ((headers (with-current-buffer gnus-summary-buffer
6578                    gnus-current-headers)))
6579     (or (not gnus-use-cross-reference)
6580         (not headers)
6581         (and (mail-header-xref headers)
6582              (not (string= (mail-header-xref headers) "")))
6583         (let ((case-fold-search t)
6584               xref)
6585           (save-restriction
6586             (nnheader-narrow-to-headers)
6587             (goto-char (point-min))
6588             (when (or (and (not (eobp))
6589                            (eq (downcase (char-after)) ?x)
6590                            (looking-at "Xref:"))
6591                       (search-forward "\nXref:" nil t))
6592               (goto-char (1+ (match-end 0)))
6593               (setq xref (buffer-substring (point) (point-at-eol)))
6594               (mail-header-set-xref headers xref)))))))
6595
6596 (defun gnus-summary-insert-subject (id &optional old-header use-old-header)
6597   "Find article ID and insert the summary line for that article.
6598 OLD-HEADER can either be a header or a line number to insert
6599 the subject line on.
6600 If USE-OLD-HEADER is non-nil, then OLD-HEADER should be a header,
6601 and OLD-HEADER will be used when the summary line is inserted,
6602 too, instead of trying to fetch new headers."
6603   (let* ((line (and (numberp old-header) old-header))
6604          (old-header (and (vectorp old-header) old-header))
6605          (header (cond ((and old-header use-old-header)
6606                         old-header)
6607                        ((and (numberp id)
6608                              (gnus-number-to-header id))
6609                         (gnus-number-to-header id))
6610                        (t
6611                         (gnus-read-header id))))
6612          (number (and (numberp id) id))
6613          d)
6614     (when header
6615       ;; Rebuild the thread that this article is part of and go to the
6616       ;; article we have fetched.
6617       (when (and (not gnus-show-threads)
6618                  old-header)
6619         (when (and number
6620                    (setq d (gnus-data-find (mail-header-number old-header))))
6621           (goto-char (gnus-data-pos d))
6622           (gnus-data-remove
6623            number
6624            (- (point-at-bol)
6625               (prog1
6626                   (1+ (point-at-eol))
6627                 (gnus-delete-line))))))
6628       ;; Remove list identifiers from subject.
6629       (let ((gnus-newsgroup-headers (list header)))
6630         (gnus-summary-remove-list-identifiers))
6631       (when old-header
6632         (mail-header-set-number header (mail-header-number old-header)))
6633       (setq gnus-newsgroup-sparse
6634             (delq (setq number (mail-header-number header))
6635                   gnus-newsgroup-sparse))
6636       (setq gnus-newsgroup-ancient (delq number gnus-newsgroup-ancient))
6637       (push number gnus-newsgroup-limit)
6638       (gnus-rebuild-thread (mail-header-id header) line)
6639       (gnus-summary-goto-subject number nil t))
6640     (when (and (numberp number)
6641                (> number 0))
6642       ;; We have to update the boundaries even if we can't fetch the
6643       ;; article if ID is a number -- so that the next `P' or `N'
6644       ;; command will fetch the previous (or next) article even
6645       ;; if the one we tried to fetch this time has been canceled.
6646       (unless (and gnus-newsgroup-end (< number gnus-newsgroup-end))
6647         (setq gnus-newsgroup-end number))
6648       (unless (and gnus-newsgroup-begin (> number gnus-newsgroup-begin))
6649         (setq gnus-newsgroup-begin number))
6650       (setq gnus-newsgroup-unselected
6651             (delq number gnus-newsgroup-unselected)))
6652     ;; Report back a success?
6653     (and header (mail-header-number header))))
6654
6655 ;;; Process/prefix in the summary buffer
6656
6657 (defun gnus-summary-work-articles (n)
6658   "Return a list of articles to be worked upon.
6659 The prefix argument, the list of process marked articles, and the
6660 current article will be taken into consideration."
6661   (with-current-buffer gnus-summary-buffer
6662     (cond
6663      (n
6664       ;; A numerical prefix has been given.
6665       (setq n (prefix-numeric-value n))
6666       (let ((backward (< n 0))
6667             (n (abs (prefix-numeric-value n)))
6668             articles article)
6669         (save-excursion
6670           (while
6671               (and (> n 0)
6672                    (push (setq article (gnus-summary-article-number))
6673                          articles)
6674                    (if backward
6675                        (gnus-summary-find-prev nil article)
6676                      (gnus-summary-find-next nil article)))
6677             (decf n)))
6678         (nreverse articles)))
6679      ((and (gnus-region-active-p) (mark))
6680       (message "region active")
6681       ;; Work on the region between point and mark.
6682       (let ((max (max (point) (mark)))
6683             articles article)
6684         (save-excursion
6685           (goto-char (min (point) (mark)))
6686           (while
6687               (and
6688                (push (setq article (gnus-summary-article-number)) articles)
6689                (gnus-summary-find-next nil article)
6690                (< (point) max)))
6691           (nreverse articles))))
6692      (gnus-newsgroup-processable
6693       ;; There are process-marked articles present.
6694       ;; Save current state.
6695       (gnus-summary-save-process-mark)
6696       ;; Return the list.
6697       (reverse gnus-newsgroup-processable))
6698      (t
6699       ;; Just return the current article.
6700       (list (gnus-summary-article-number))))))
6701
6702 (defmacro gnus-summary-iterate (arg &rest forms)
6703   "Iterate over the process/prefixed articles and do FORMS.
6704 ARG is the interactive prefix given to the command.  FORMS will be
6705 executed with point over the summary line of the articles."
6706   (let ((articles (make-symbol "gnus-summary-iterate-articles")))
6707     `(let ((,articles (gnus-summary-work-articles ,arg)))
6708        (while ,articles
6709          (gnus-summary-goto-subject (car ,articles))
6710          ,@forms
6711          (pop ,articles)))))
6712
6713 (put 'gnus-summary-iterate 'lisp-indent-function 1)
6714 (put 'gnus-summary-iterate 'edebug-form-spec '(form body))
6715
6716 (defun gnus-summary-save-process-mark ()
6717   "Push the current set of process marked articles on the stack."
6718   (interactive)
6719   (push (copy-sequence gnus-newsgroup-processable)
6720         gnus-newsgroup-process-stack))
6721
6722 (defun gnus-summary-kill-process-mark ()
6723   "Push the current set of process marked articles on the stack and unmark."
6724   (interactive)
6725   (gnus-summary-save-process-mark)
6726   (gnus-summary-unmark-all-processable))
6727
6728 (defun gnus-summary-yank-process-mark ()
6729   "Pop the last process mark state off the stack and restore it."
6730   (interactive)
6731   (unless gnus-newsgroup-process-stack
6732     (error "Empty mark stack"))
6733   (gnus-summary-process-mark-set (pop gnus-newsgroup-process-stack)))
6734
6735 (defun gnus-summary-process-mark-set (set)
6736   "Make SET into the current process marked articles."
6737   (gnus-summary-unmark-all-processable)
6738   (mapc 'gnus-summary-set-process-mark set))
6739
6740 ;;; Searching and stuff
6741
6742 (defun gnus-summary-search-group (&optional backward use-level)
6743   "Search for next unread newsgroup.
6744 If optional argument BACKWARD is non-nil, search backward instead."
6745   (with-current-buffer gnus-group-buffer
6746     (when (gnus-group-search-forward
6747            backward nil (if use-level (gnus-group-group-level) nil))
6748       (gnus-group-group-name))))
6749
6750 (defun gnus-summary-best-group (&optional exclude-group)
6751   "Find the name of the best unread group.
6752 If EXCLUDE-GROUP, do not go to this group."
6753   (with-current-buffer gnus-group-buffer
6754     (save-excursion
6755       (gnus-group-best-unread-group exclude-group))))
6756
6757 (defun gnus-summary-find-next (&optional unread article backward)
6758   (if backward
6759       (gnus-summary-find-prev unread article)
6760     (let* ((dummy (gnus-summary-article-intangible-p))
6761            (article (or article (gnus-summary-article-number)))
6762            (data (gnus-data-find-list article))
6763            result)
6764       (when (and (not dummy)
6765                  (or (not gnus-summary-check-current)
6766                      (not unread)
6767                      (not (gnus-data-unread-p (car data)))))
6768         (setq data (cdr data)))
6769       (when (setq result
6770                   (if unread
6771                       (progn
6772                         (while data
6773                           (unless (memq (gnus-data-number (car data))
6774                                         (cond
6775                                          ((eq gnus-auto-goto-ignores
6776                                               'always-undownloaded)
6777                                           gnus-newsgroup-undownloaded)
6778                                          (gnus-plugged
6779                                           nil)
6780                                          ((eq gnus-auto-goto-ignores
6781                                               'unfetched)
6782                                           gnus-newsgroup-unfetched)
6783                                          ((eq gnus-auto-goto-ignores
6784                                               'undownloaded)
6785                                           gnus-newsgroup-undownloaded)))
6786                             (when (gnus-data-unread-p (car data))
6787                               (setq result (car data)
6788                                     data nil)))
6789                           (setq data (cdr data)))
6790                         result)
6791                     (car data)))
6792         (goto-char (gnus-data-pos result))
6793         (gnus-data-number result)))))
6794
6795 (defun gnus-summary-find-prev (&optional unread article)
6796   (let* ((eobp (eobp))
6797          (article (or article (gnus-summary-article-number)))
6798          (data (gnus-data-find-list article (gnus-data-list 'rev)))
6799          result)
6800     (when (and (not eobp)
6801                (or (not gnus-summary-check-current)
6802                    (not unread)
6803                    (not (gnus-data-unread-p (car data)))))
6804       (setq data (cdr data)))
6805     (when (setq result
6806                 (if unread
6807                     (progn
6808                       (while data
6809                         (unless (memq (gnus-data-number (car data))
6810                                       (cond
6811                                        ((eq gnus-auto-goto-ignores
6812                                             'always-undownloaded)
6813                                         gnus-newsgroup-undownloaded)
6814                                        (gnus-plugged
6815                                         nil)
6816                                        ((eq gnus-auto-goto-ignores
6817                                             'unfetched)
6818                                         gnus-newsgroup-unfetched)
6819                                        ((eq gnus-auto-goto-ignores
6820                                             'undownloaded)
6821                                         gnus-newsgroup-undownloaded)))
6822                           (when (gnus-data-unread-p (car data))
6823                             (setq result (car data)
6824                                   data nil)))
6825                         (setq data (cdr data)))
6826                       result)
6827                   (car data)))
6828       (goto-char (gnus-data-pos result))
6829       (gnus-data-number result))))
6830
6831 (defun gnus-summary-find-subject (subject &optional unread backward article)
6832   (let* ((simp-subject (gnus-simplify-subject-fully subject))
6833          (article (or article (gnus-summary-article-number)))
6834          (articles (gnus-data-list backward))
6835          (arts (gnus-data-find-list article articles))
6836          result)
6837     (when (or (not gnus-summary-check-current)
6838               (not unread)
6839               (not (gnus-data-unread-p (car arts))))
6840       (setq arts (cdr arts)))
6841     (while arts
6842       (and (or (not unread)
6843                (gnus-data-unread-p (car arts)))
6844            (vectorp (gnus-data-header (car arts)))
6845            (gnus-subject-equal
6846             simp-subject (mail-header-subject (gnus-data-header (car arts))) t)
6847            (setq result (car arts)
6848                  arts nil))
6849       (setq arts (cdr arts)))
6850     (and result
6851          (goto-char (gnus-data-pos result))
6852          (gnus-data-number result))))
6853
6854 (defun gnus-summary-search-forward (&optional unread subject backward)
6855   "Search forward for an article.
6856 If UNREAD, look for unread articles.  If SUBJECT, look for
6857 articles with that subject.  If BACKWARD, search backward instead."
6858   (cond (subject (gnus-summary-find-subject subject unread backward))
6859         (backward (gnus-summary-find-prev unread))
6860         (t (gnus-summary-find-next unread))))
6861
6862 (defun gnus-recenter (&optional n)
6863   "Center point in window and redisplay frame.
6864 Also do horizontal recentering."
6865   (interactive "P")
6866   (when (and gnus-auto-center-summary
6867              (not (eq gnus-auto-center-summary 'vertical)))
6868     (gnus-horizontal-recenter))
6869   (if (fboundp 'recenter-top-bottom)
6870       (recenter-top-bottom n)
6871     (recenter n)))
6872
6873 (put 'gnus-recenter 'isearch-scroll t)
6874
6875 (defun gnus-forward-line-ignore-invisible (n)
6876   "Move N lines forward (backward if N is negative).
6877 Like forward-line, but skip over (and don't count) invisible lines."
6878   (let (done)
6879     (while (and (> n 0) (not done))
6880       ;; If the following character is currently invisible,
6881       ;; skip all characters with that same `invisible' property value.
6882       (while (gnus-invisible-p (point))
6883         (goto-char (gnus-next-char-property-change (point))))
6884       (forward-line 1)
6885       (if (eobp)
6886           (setq done t)
6887         (setq n (1- n))))
6888     (while (and (< n 0) (not done))
6889       (forward-line -1)
6890       (if (bobp) (setq done t)
6891         (setq n (1+ n))
6892         (while (and (not (bobp)) (gnus-invisible-p (1- (point))))
6893           (goto-char (gnus-previous-char-property-change (point))))))))
6894
6895 (defun gnus-summary-recenter ()
6896   "Center point in the summary window.
6897 If `gnus-auto-center-summary' is nil, or the article buffer isn't
6898 displayed, no centering will be performed."
6899   ;; Suggested by earle@mahendo.JPL.NASA.GOV (Greg Earle).
6900   ;; Recenter only when requested.  Suggested by popovich@park.cs.columbia.edu.
6901   (interactive)
6902   ;; The user has to want it.
6903   (when gnus-auto-center-summary
6904     (let* ((top (cond ((< (window-height) 4) 0)
6905                       ((< (window-height) 7) 1)
6906                       (t (if (numberp gnus-auto-center-summary)
6907                              gnus-auto-center-summary
6908                            (/ (1- (window-height)) 2)))))
6909            (height (1- (window-height)))
6910            (bottom (save-excursion
6911                      (goto-char (point-max))
6912                      (gnus-forward-line-ignore-invisible (- height))
6913                      (point)))
6914            (window (get-buffer-window (current-buffer))))
6915       (when (get-buffer-window gnus-article-buffer)
6916         ;; Only do recentering when the article buffer is displayed,
6917         ;; Set the window start to either `bottom', which is the biggest
6918         ;; possible valid number, or the second line from the top,
6919         ;; whichever is the least.
6920         (let ((top-pos (save-excursion
6921                          (gnus-forward-line-ignore-invisible (- top))
6922                          (point))))
6923           (if (> bottom top-pos)
6924               ;; Keep the second line from the top visible
6925               (set-window-start window top-pos)
6926             ;; Try to keep the bottom line visible; if it's partially
6927             ;; obscured, either scroll one more line to make it fully
6928             ;; visible, or revert to using TOP-POS.
6929             (save-excursion
6930               (goto-char (point-max))
6931               (gnus-forward-line-ignore-invisible -1)
6932               (let ((last-line-start (point)))
6933                 (goto-char bottom)
6934                 (set-window-start window (point) t)
6935                 (when (not (pos-visible-in-window-p last-line-start window))
6936                   (gnus-forward-line-ignore-invisible 1)
6937                   (set-window-start window (min (point) top-pos) t)))))))
6938       ;; Do horizontal recentering while we're at it.
6939       (when (and (get-buffer-window (current-buffer) t)
6940                  (not (eq gnus-auto-center-summary 'vertical)))
6941         (let ((selected (selected-window)))
6942           (select-window (get-buffer-window (current-buffer) t))
6943           (gnus-summary-position-point)
6944           (gnus-horizontal-recenter)
6945           (select-window selected))))))
6946
6947 (defun gnus-summary-jump-to-group (newsgroup)
6948   "Move point to NEWSGROUP in group mode buffer."
6949   ;; Keep update point of group mode buffer if visible.
6950   (if (eq (current-buffer) (get-buffer gnus-group-buffer))
6951       (save-window-excursion
6952         ;; Take care of tree window mode.
6953         (when (get-buffer-window gnus-group-buffer)
6954           (pop-to-buffer gnus-group-buffer))
6955         (gnus-group-jump-to-group newsgroup))
6956     (save-excursion
6957       ;; Take care of tree window mode.
6958       (if (get-buffer-window gnus-group-buffer 0)
6959           (pop-to-buffer gnus-group-buffer)
6960         (set-buffer gnus-group-buffer))
6961       (gnus-group-jump-to-group newsgroup))))
6962
6963 ;; This function returns a list of article numbers based on the
6964 ;; difference between the ranges of read articles in this group and
6965 ;; the range of active articles.
6966 (defun gnus-list-of-unread-articles (group)
6967   (let* ((read (gnus-info-read (gnus-get-info group)))
6968          (active (or (gnus-active group) (gnus-activate-group group)))
6969          (last (or (cdr active)
6970                    (error "Group %s couldn't be activated " group)))
6971          (bottom (if gnus-newsgroup-maximum-articles
6972                      (max (car active)
6973                           (- last gnus-newsgroup-maximum-articles -1))
6974                    (car active)))
6975          first nlast unread)
6976     ;; If none are read, then all are unread.
6977     (if (not read)
6978         (setq first bottom)
6979       ;; If the range of read articles is a single range, then the
6980       ;; first unread article is the article after the last read
6981       ;; article.  Sounds logical, doesn't it?
6982       (if (and (not (listp (cdr read)))
6983                (or (< (car read) bottom)
6984                    (progn (setq read (list read))
6985                           nil)))
6986           (setq first (max bottom (1+ (cdr read))))
6987         ;; `read' is a list of ranges.
6988         (when (/= (setq nlast (or (and (numberp (car read)) (car read))
6989                                   (caar read)))
6990                   1)
6991           (setq first bottom))
6992         (while read
6993           (when first
6994             (while (< first nlast)
6995               (setq unread (cons first unread)
6996                     first (1+ first))))
6997           (setq first (1+ (if (atom (car read)) (car read) (cdar read))))
6998           (setq nlast (if (atom (cadr read)) (cadr read) (caadr read)))
6999           (setq read (cdr read)))))
7000     ;; And add the last unread articles.
7001     (while (<= first last)
7002       (setq unread (cons first unread)
7003             first (1+ first)))
7004     ;; Return the list of unread articles.
7005     (delq 0 (nreverse unread))))
7006
7007 (defun gnus-list-of-read-articles (group)
7008   "Return a list of unread, unticked and non-dormant articles."
7009   (let* ((info (gnus-get-info group))
7010          (marked (gnus-info-marks info))
7011          (active (gnus-active group)))
7012     (and info active
7013          (gnus-list-range-difference
7014           (gnus-list-range-difference
7015            (gnus-sorted-complement
7016             (gnus-uncompress-range
7017              (if gnus-newsgroup-maximum-articles
7018                  (cons (max (car active)
7019                             (- (cdr active)
7020                                gnus-newsgroup-maximum-articles
7021                                -1))
7022                        (cdr active))
7023                active))
7024             (gnus-list-of-unread-articles group))
7025            (cdr (assq 'dormant marked)))
7026           (cdr (assq 'tick marked))))))
7027
7028 ;; This function returns a sequence of article numbers based on the
7029 ;; difference between the ranges of read articles in this group and
7030 ;; the range of active articles.
7031 (defun gnus-sequence-of-unread-articles (group)
7032   (let* ((read (gnus-info-read (gnus-get-info group)))
7033          (active (or (gnus-active group) (gnus-activate-group group)))
7034          (last (cdr active))
7035          (bottom (if gnus-newsgroup-maximum-articles
7036                      (max (car active)
7037                           (- last gnus-newsgroup-maximum-articles -1))
7038                    (car active)))
7039          first nlast unread)
7040     ;; If none are read, then all are unread.
7041     (if (not read)
7042         (setq first bottom)
7043       ;; If the range of read articles is a single range, then the
7044       ;; first unread article is the article after the last read
7045       ;; article.  Sounds logical, doesn't it?
7046       (if (and (not (listp (cdr read)))
7047                (or (< (car read) bottom)
7048                    (progn (setq read (list read))
7049                           nil)))
7050           (setq first (max bottom (1+ (cdr read))))
7051         ;; `read' is a list of ranges.
7052         (when (/= (setq nlast (or (and (numberp (car read)) (car read))
7053                                   (caar read)))
7054                   1)
7055           (setq first bottom))
7056         (while read
7057           (when first
7058             (push (cons first nlast) unread))
7059           (setq first (1+ (if (atom (car read)) (car read) (cdar read))))
7060           (setq nlast (if (atom (cadr read)) (cadr read) (caadr read)))
7061           (setq read (cdr read)))))
7062     ;; And add the last unread articles.
7063     (cond ((not (and first last))
7064            nil)
7065           ((< first last)
7066            (push (cons first last) unread))
7067           ((= first last)
7068            (push first unread)))
7069     ;; Return the sequence of unread articles.
7070     (delq 0 (nreverse unread))))
7071
7072 ;; Various summary commands
7073
7074 (defun gnus-summary-select-article-buffer ()
7075   "Reconfigure windows to show the article buffer.
7076 If `gnus-widen-article-window' is set, show only the article
7077 buffer."
7078   (interactive)
7079   (if (not (gnus-buffer-live-p gnus-article-buffer))
7080       (error "There is no article buffer for this summary buffer")
7081     (unless (get-buffer-window gnus-article-buffer)
7082       (gnus-summary-show-article))
7083     (gnus-configure-windows
7084      (if gnus-widen-article-window
7085          'only-article
7086        'article)
7087      t)
7088     (select-window (get-buffer-window gnus-article-buffer))))
7089
7090 (defun gnus-summary-universal-argument (arg)
7091   "Perform any operation on all articles that are process/prefixed."
7092   (interactive "P")
7093   (let ((articles (gnus-summary-work-articles arg))
7094         func article)
7095     (if (eq
7096          (setq
7097           func
7098           (key-binding
7099            (read-key-sequence
7100             (substitute-command-keys
7101              "\\<gnus-summary-mode-map>\\[gnus-summary-universal-argument]"))))
7102          'undefined)
7103         (gnus-error 1 "Undefined key")
7104       (save-excursion
7105         (while articles
7106           (gnus-summary-goto-subject (setq article (pop articles)))
7107           (let (gnus-newsgroup-processable)
7108             (command-execute func))
7109           (gnus-summary-remove-process-mark article)))))
7110   (gnus-summary-position-point))
7111
7112 (defun gnus-summary-toggle-truncation (&optional arg)
7113   "Toggle truncation of summary lines.
7114 With ARG, turn line truncation on if ARG is positive."
7115   (interactive "P")
7116   (setq truncate-lines
7117         (if (null arg) (not truncate-lines)
7118           (> (prefix-numeric-value arg) 0)))
7119   (redraw-display))
7120
7121 (defun gnus-summary-find-for-reselect ()
7122   "Return the number of an article to stay on across a reselect.
7123 The current article is considered, then following articles, then previous
7124 articles.  An article is sought which is not canceled and isn't a temporary
7125 insertion from another group.  If there's no such then return a dummy 0."
7126   (let (found)
7127     (dolist (rev '(nil t))
7128       (unless found      ; don't demand the reverse list if we don't need it
7129         (let ((data (gnus-data-find-list
7130                      (gnus-summary-article-number) (gnus-data-list rev))))
7131           (while (and data (not found))
7132             (if (and (< 0 (gnus-data-number (car data)))
7133                      (not (eq gnus-canceled-mark (gnus-data-mark (car data)))))
7134                 (setq found (gnus-data-number (car data))))
7135             (setq data (cdr data))))))
7136     (or found 0)))
7137
7138 (defun gnus-summary-reselect-current-group (&optional all rescan)
7139   "Exit and then reselect the current newsgroup.
7140 The prefix argument ALL means to select all articles."
7141   (interactive "P")
7142   (when (gnus-ephemeral-group-p gnus-newsgroup-name)
7143     (error "Ephemeral groups can't be reselected"))
7144   (let ((current-subject (gnus-summary-find-for-reselect))
7145         (group gnus-newsgroup-name))
7146     (setq gnus-newsgroup-begin nil)
7147     (gnus-summary-exit nil 'leave-hidden)
7148     ;; We have to adjust the point of group mode buffer because
7149     ;; point was moved to the next unread newsgroup by exiting.
7150     (gnus-summary-jump-to-group group)
7151     (when rescan
7152       (save-excursion
7153         (gnus-group-get-new-news-this-group 1)))
7154     (gnus-group-read-group all t)
7155     (gnus-summary-goto-subject current-subject nil t)))
7156
7157 (defun gnus-summary-rescan-group (&optional all)
7158   "Exit the newsgroup, ask for new articles, and select the newsgroup."
7159   (interactive "P")
7160   (let ((config gnus-current-window-configuration))
7161     (gnus-summary-reselect-current-group all t)
7162     (gnus-configure-windows config)
7163     (when (eq config 'article)
7164       (gnus-summary-select-article))))
7165
7166 (defun gnus-summary-update-info (&optional non-destructive)
7167   (save-excursion
7168     (let ((group gnus-newsgroup-name))
7169       (when group
7170         (when gnus-newsgroup-kill-headers
7171           (setq gnus-newsgroup-killed
7172                 (gnus-compress-sequence
7173                  (gnus-sorted-union
7174                   (gnus-list-range-intersection
7175                    gnus-newsgroup-unselected gnus-newsgroup-killed)
7176                   gnus-newsgroup-unreads)
7177                  t)))
7178         (unless (listp (cdr gnus-newsgroup-killed))
7179           (setq gnus-newsgroup-killed (list gnus-newsgroup-killed)))
7180         (let ((headers gnus-newsgroup-headers)
7181               (ephemeral-p (gnus-ephemeral-group-p group))
7182               info)
7183           (unless ephemeral-p
7184             (setq info (copy-sequence (gnus-get-info group))
7185                   info (delq (gnus-info-params info) info)))
7186           ;; Set the new ranges of read articles.
7187           (with-current-buffer gnus-group-buffer
7188             (gnus-undo-force-boundary))
7189           (gnus-update-read-articles
7190            group (gnus-sorted-union
7191                   gnus-newsgroup-unreads gnus-newsgroup-unselected))
7192           ;; Set the current article marks.
7193           (let ((gnus-newsgroup-scored
7194                  (if (and (not gnus-save-score)
7195                           (not non-destructive))
7196                      nil
7197                    gnus-newsgroup-scored)))
7198             (save-excursion
7199               (gnus-update-marks)))
7200           ;; Do the cross-ref thing.
7201           (when gnus-use-cross-reference
7202             (gnus-mark-xrefs-as-read group headers gnus-newsgroup-unreads))
7203           ;; Do not switch windows but change the buffer to work.
7204           (set-buffer gnus-group-buffer)
7205           (unless ephemeral-p
7206             (gnus-group-update-group
7207              group nil
7208              (equal info
7209                     (setq info (copy-sequence (gnus-get-info group))
7210                           info (delq (gnus-info-params info) info))))))))))
7211
7212 (defun gnus-summary-save-newsrc (&optional force)
7213   "Save the current number of read/marked articles in the dribble buffer.
7214 The dribble buffer will then be saved.
7215 If FORCE (the prefix), also save the .newsrc file(s)."
7216   (interactive "P")
7217   (gnus-summary-update-info t)
7218   (if force
7219       (gnus-save-newsrc-file)
7220     (gnus-dribble-save)))
7221
7222 (declare-function gnus-cache-write-active "gnus-cache" (&optional force))
7223 (declare-function gnus-article-stop-animations "gnus-art" ())
7224
7225 (defun gnus-summary-exit (&optional temporary leave-hidden)
7226   "Exit reading current newsgroup, and then return to group selection mode.
7227 `gnus-exit-group-hook' is called with no arguments if that value is non-nil."
7228   (interactive)
7229   (gnus-set-global-variables)
7230   (when (gnus-buffer-live-p gnus-article-buffer)
7231     (with-current-buffer gnus-article-buffer
7232       (mm-destroy-parts gnus-article-mime-handles)
7233       ;; Set it to nil for safety reason.
7234       (setq gnus-article-mime-handle-alist nil)
7235       (setq gnus-article-mime-handles nil)))
7236   (gnus-kill-save-kill-buffer)
7237   (gnus-async-halt-prefetch)
7238   (let* ((group gnus-newsgroup-name)
7239          (quit-config (gnus-group-quit-config gnus-newsgroup-name))
7240          (gnus-group-is-exiting-p t)
7241          (article-buffer gnus-article-buffer)
7242          (original-article-buffer gnus-original-article-buffer)
7243          (mode major-mode)
7244          (group-point nil)
7245          (buf (current-buffer))
7246          ;; `gnus-single-article-buffer' is nil buffer-locally in
7247          ;; ephemeral group of which summary buffer will be killed,
7248          ;; but the global value may be non-nil.
7249          (single-article-buffer gnus-single-article-buffer))
7250     (unless quit-config
7251       ;; Do adaptive scoring, and possibly save score files.
7252       (when gnus-newsgroup-adaptive
7253         (gnus-score-adaptive))
7254       (when gnus-use-scoring
7255         (gnus-score-save)))
7256     (gnus-run-hooks 'gnus-summary-prepare-exit-hook)
7257     (when gnus-use-cache
7258       (gnus-cache-possibly-remove-articles)
7259       (gnus-cache-save-buffers))
7260     (gnus-async-prefetch-remove-group group)
7261     (when gnus-suppress-duplicates
7262       (gnus-dup-enter-articles))
7263     (when gnus-use-trees
7264       (gnus-tree-close))
7265     (when gnus-use-cache
7266       (gnus-cache-write-active))
7267     ;; Remove entries for this group.
7268     (nnmail-purge-split-history (gnus-group-real-name group))
7269     ;; Make all changes in this group permanent.
7270     (unless quit-config
7271       (gnus-run-hooks 'gnus-exit-group-hook)
7272       (gnus-summary-update-info))
7273     (gnus-close-group group)
7274     ;; Make sure where we were, and go to next newsgroup.
7275     (when (buffer-live-p (get-buffer gnus-group-buffer))
7276       (set-buffer gnus-group-buffer))
7277     (unless quit-config
7278       (gnus-group-jump-to-group group))
7279     (gnus-run-hooks 'gnus-summary-exit-hook)
7280     (unless (or quit-config
7281                 (not gnus-summary-next-group-on-exit)
7282                 ;; If this group has disappeared from the summary
7283                 ;; buffer, don't skip forwards.
7284                 (not (string= group (gnus-group-group-name))))
7285       (gnus-group-next-unread-group 1))
7286     (setq group-point (point))
7287     (gnus-article-stop-animations)
7288     (if temporary
7289         nil                             ;Nothing to do.
7290       (set-buffer buf)
7291       (if (not gnus-kill-summary-on-exit)
7292           (progn
7293             (gnus-deaden-summary)
7294             (setq mode nil))
7295         (when (get-buffer gnus-article-buffer)
7296           (bury-buffer gnus-article-buffer))
7297         ;; Return to group mode buffer.
7298         (when (eq mode 'gnus-summary-mode)
7299           (gnus-kill-buffer buf)))
7300
7301       (setq gnus-current-select-method gnus-select-method)
7302       (when (gnus-buffer-live-p gnus-group-buffer)
7303         (set-buffer gnus-group-buffer))
7304       (if quit-config
7305           (gnus-handle-ephemeral-exit quit-config)
7306         (goto-char group-point)
7307         ;; If gnus-group-buffer is already displayed, make sure we also move
7308         ;; the cursor in the window that displays it.
7309         (let ((win (get-buffer-window (current-buffer) 0)))
7310           (if win (set-window-point win (point))))
7311         (unless leave-hidden
7312           (gnus-configure-windows 'group 'force)))
7313
7314       ;; If we have several article buffers, we kill them at exit.
7315       (unless single-article-buffer
7316         (when (gnus-buffer-live-p article-buffer)
7317           (with-current-buffer article-buffer
7318             ;; Don't kill sticky article buffers
7319             (unless (eq major-mode 'gnus-sticky-article-mode)
7320               (gnus-kill-buffer article-buffer)
7321               (setq gnus-article-current nil))))
7322         (gnus-kill-buffer original-article-buffer))
7323
7324       ;; Clear the current group name.
7325       (unless quit-config
7326         (setq gnus-newsgroup-name nil)))))
7327
7328 (declare-function gnus-stop-downloads "gnus-art" ())
7329
7330 (defalias 'gnus-summary-quit 'gnus-summary-exit-no-update)
7331 (defun gnus-summary-exit-no-update (&optional no-questions)
7332   "Quit reading current newsgroup without updating read article info."
7333   (interactive)
7334   (let* ((group gnus-newsgroup-name)
7335          (gnus-group-is-exiting-p t)
7336          (gnus-group-is-exiting-without-update-p t)
7337          (quit-config (gnus-group-quit-config group)))
7338     (when (or no-questions
7339               (gnus-ephemeral-group-p group)
7340               gnus-expert-user
7341               (gnus-y-or-n-p "Discard changes to this group and exit? "))
7342       (gnus-async-halt-prefetch)
7343       (run-hooks 'gnus-summary-prepare-exit-hook)
7344       (when (gnus-buffer-live-p gnus-article-buffer)
7345         (with-current-buffer gnus-article-buffer
7346           (gnus-article-stop-animations)
7347           (gnus-stop-downloads)
7348           (mm-destroy-parts gnus-article-mime-handles)
7349           ;; Set it to nil for safety reason.
7350           (setq gnus-article-mime-handle-alist nil)
7351           (setq gnus-article-mime-handles nil)))
7352       ;; If we have several article buffers, we kill them at exit.
7353       (unless gnus-single-article-buffer
7354         (gnus-kill-buffer gnus-article-buffer)
7355         (gnus-kill-buffer gnus-original-article-buffer)
7356         (setq gnus-article-current nil))
7357       ;; Return to the group buffer.
7358       (if (not gnus-kill-summary-on-exit)
7359           (progn
7360             (gnus-deaden-summary)
7361             (gnus-configure-windows 'group 'force))
7362         (gnus-configure-windows 'group 'force)
7363         (gnus-close-group group)
7364         (gnus-kill-buffer gnus-summary-buffer))
7365       (unless gnus-single-article-buffer
7366         (setq gnus-article-current nil))
7367       (when gnus-use-trees
7368         (gnus-tree-close))
7369       (gnus-async-prefetch-remove-group group)
7370       (when (get-buffer gnus-article-buffer)
7371         (bury-buffer gnus-article-buffer))
7372       ;; Clear the current group name.
7373       (setq gnus-newsgroup-name nil)
7374       (unless (gnus-ephemeral-group-p group)
7375         (gnus-group-update-group group nil t))
7376       (when (equal (gnus-group-group-name) group)
7377         (gnus-group-next-unread-group 1))
7378       (gnus-article-stop-animations)
7379       (when quit-config
7380         (gnus-handle-ephemeral-exit quit-config)))))
7381
7382 (defun gnus-handle-ephemeral-exit (quit-config)
7383   "Handle movement when leaving an ephemeral group.
7384 The state which existed when entering the ephemeral is reset."
7385   (if (not (buffer-live-p (car quit-config)))
7386       (when (gnus-buffer-live-p gnus-group-buffer)
7387         (gnus-configure-windows 'group 'force))
7388     (set-buffer (car quit-config))
7389     (unless (eq (cdr quit-config) 'group)
7390       (setq gnus-current-select-method
7391             (gnus-find-method-for-group gnus-newsgroup-name)))
7392     (cond ((derived-mode-p 'gnus-summary-mode)
7393            (gnus-set-global-variables))
7394           ((derived-mode-p 'gnus-article-mode)
7395            (save-current-buffer
7396              ;; The `gnus-summary-buffer' variable may point
7397              ;; to the old summary buffer when using a single
7398              ;; article buffer.
7399              (unless (gnus-buffer-live-p gnus-summary-buffer)
7400                (set-buffer gnus-group-buffer))
7401              (set-buffer gnus-summary-buffer)
7402              (gnus-set-global-variables))))
7403     (if (or (eq (cdr quit-config) 'article)
7404             (eq (cdr quit-config) 'pick))
7405         (if (and (boundp 'gnus-pick-mode) (symbol-value 'gnus-pick-mode))
7406             (gnus-configure-windows 'pick 'force)
7407           (gnus-configure-windows (cdr quit-config) 'force))
7408       (gnus-configure-windows (cdr quit-config) 'force))
7409     (when (derived-mode-p 'gnus-summary-mode)
7410       (if (memq gnus-auto-select-on-ephemeral-exit '(next-noselect
7411                                                      next-unread-noselect))
7412           (when (zerop (cond ((eq gnus-auto-select-on-ephemeral-exit
7413                                   'next-noselect)
7414                               (gnus-summary-next-subject 1 nil t))
7415                              ((eq gnus-auto-select-on-ephemeral-exit
7416                                   'next-unread-noselect)
7417                               (gnus-summary-next-subject 1 t t))))
7418             ;; Hide the article buffer which displays the article different
7419             ;; from the one that the cursor points to in the summary buffer.
7420             (gnus-configure-windows 'summary 'force))
7421         (cond ((eq gnus-auto-select-on-ephemeral-exit 'next)
7422                (gnus-summary-next-subject 1))
7423               ((eq gnus-auto-select-on-ephemeral-exit 'next-unread)
7424                (gnus-summary-next-subject 1 t))))
7425       (gnus-summary-recenter)
7426       (gnus-summary-position-point))))
7427
7428 ;;; Dead summaries.
7429
7430 (defvar gnus-dead-summary-mode-map
7431   (let ((map (make-keymap)))
7432     (suppress-keymap map)
7433     (substitute-key-definition 'undefined 'gnus-summary-wake-up-the-dead map)
7434     (dolist (key '("\C-d" "\r" "\177" [delete]))
7435       (define-key map key 'gnus-summary-wake-up-the-dead))
7436     (dolist (key '("q" "Q"))
7437       (define-key map key 'bury-buffer))
7438     map))
7439
7440 (define-minor-mode gnus-dead-summary-mode
7441   "Minor mode for Gnus summary buffers."
7442   :lighter " Dead" :keymap gnus-dead-summary-mode-map
7443   (unless (derived-mode-p 'gnus-summary-mode)
7444     (setq gnus-dead-summary-mode nil)))
7445
7446 (defun gnus-deaden-summary ()
7447   "Make the current summary buffer into a dead summary buffer."
7448   ;; Kill any previous dead summary buffer.
7449   (when (and gnus-dead-summary
7450              (buffer-name gnus-dead-summary))
7451     (with-current-buffer gnus-dead-summary
7452       (when gnus-dead-summary-mode
7453         (kill-buffer (current-buffer)))))
7454   ;; Make this the current dead summary.
7455   (setq gnus-dead-summary (current-buffer))
7456   (gnus-dead-summary-mode 1)
7457   (let ((name (buffer-name)))
7458     (when (string-match "Summary" name)
7459       (rename-buffer
7460        (concat (substring name 0 (match-beginning 0)) "Dead "
7461                (substring name (match-beginning 0)))
7462        t)
7463       (bury-buffer))))
7464
7465 (defun gnus-kill-or-deaden-summary (buffer)
7466   "Kill or deaden the summary BUFFER."
7467   (save-excursion
7468     (when (and (buffer-name buffer)
7469                (not gnus-single-article-buffer))
7470       (with-current-buffer buffer
7471         (gnus-kill-buffer gnus-article-buffer)
7472         (gnus-kill-buffer gnus-original-article-buffer)))
7473     (cond
7474      ;; Kill the buffer.
7475      (gnus-kill-summary-on-exit
7476       (when (and gnus-use-trees
7477                  (gnus-buffer-exists-p buffer))
7478         (with-current-buffer buffer
7479           (gnus-tree-close)))
7480       (gnus-kill-buffer buffer))
7481      ;; Deaden the buffer.
7482      ((gnus-buffer-exists-p buffer)
7483       (with-current-buffer buffer
7484         (gnus-deaden-summary))))))
7485
7486 (defun gnus-summary-wake-up-the-dead (&rest args)
7487   "Wake up the dead summary buffer."
7488   (interactive)
7489   (gnus-dead-summary-mode -1)
7490   (let ((name (buffer-name)))
7491     (when (string-match "Dead " name)
7492       (rename-buffer
7493        (concat (substring name 0 (match-beginning 0))
7494                (substring name (match-end 0)))
7495        t)))
7496   (gnus-message 3 "This dead summary is now alive again"))
7497
7498 ;; Suggested by Per Abrahamsen <amanda@iesd.auc.dk>.
7499 (defun gnus-summary-describe-group (&optional force)
7500   "Describe the current newsgroup."
7501   (interactive "P")
7502   (gnus-group-describe-group force gnus-newsgroup-name))
7503
7504 (defun gnus-summary-describe-briefly ()
7505   "Describe summary mode commands briefly."
7506   (interactive)
7507   (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")))
7508
7509 ;; Walking around group mode buffer from summary mode.
7510
7511 (defun gnus-summary-next-group (&optional no-article target-group backward)
7512   "Exit current newsgroup and then select next unread newsgroup.
7513 If prefix argument NO-ARTICLE is non-nil, no article is selected
7514 initially.  If TARGET-GROUP, go to this group.  If BACKWARD, go to
7515 previous group instead."
7516   (interactive "P")
7517   ;; Stop pre-fetching.
7518   (gnus-async-halt-prefetch)
7519   (let ((current-group gnus-newsgroup-name)
7520         (current-buffer (current-buffer))
7521         entered)
7522     ;; First we semi-exit this group to update Xrefs and all variables.
7523     ;; We can't do a real exit, because the window conf must remain
7524     ;; the same in case the user is prompted for info, and we don't
7525     ;; want the window conf to change before that...
7526     (gnus-summary-exit t)
7527     (while (not entered)
7528       ;; Then we find what group we are supposed to enter.
7529       (set-buffer gnus-group-buffer)
7530       (gnus-group-jump-to-group current-group)
7531       (setq target-group
7532             (or target-group
7533                 (if (eq gnus-keep-same-level 'best)
7534                     (gnus-summary-best-group gnus-newsgroup-name)
7535                   (gnus-summary-search-group backward gnus-keep-same-level))))
7536       (if (not target-group)
7537           ;; There are no further groups, so we return to the group
7538           ;; buffer.
7539           (progn
7540             (gnus-message 5 "Returning to the group buffer")
7541             (setq entered t)
7542             (when (gnus-buffer-live-p current-buffer)
7543               (set-buffer current-buffer)
7544               (gnus-summary-exit))
7545             (gnus-run-hooks 'gnus-group-no-more-groups-hook))
7546         ;; We try to enter the target group.
7547         (gnus-group-jump-to-group target-group)
7548         (let ((unreads (gnus-group-group-unread)))
7549           (if (and (or (eq t unreads)
7550                        (and unreads (not (zerop unreads))))
7551                    (gnus-summary-read-group
7552                     target-group nil no-article
7553                     (and (buffer-name current-buffer) current-buffer)
7554                     nil backward))
7555               (setq entered t)
7556             (setq current-group target-group
7557                   target-group nil)))))))
7558
7559 (defun gnus-summary-prev-group (&optional no-article)
7560   "Exit current newsgroup and then select previous unread newsgroup.
7561 If prefix argument NO-ARTICLE is non-nil, no article is selected initially."
7562   (interactive "P")
7563   (gnus-summary-next-group no-article nil t))
7564
7565 ;; Walking around summary lines.
7566
7567 (defun gnus-summary-first-subject (&optional unread undownloaded unseen)
7568   "Go to the first subject satisfying any non-nil constraint.
7569 If UNREAD is non-nil, the article should be unread.
7570 If UNDOWNLOADED is non-nil, the article should be undownloaded.
7571 If UNSEEN is non-nil, the article should be unseen as well as unread.
7572 Returns the article selected or nil if there are no matching articles."
7573   (interactive "P")
7574   (cond
7575    ;; Empty summary.
7576    ((null gnus-newsgroup-data)
7577     (gnus-message 3 "No articles in the group")
7578     nil)
7579    ;; Pick the first article.
7580    ((not (or unread undownloaded unseen))
7581     (goto-char (gnus-data-pos (car gnus-newsgroup-data)))
7582     (gnus-data-number (car gnus-newsgroup-data)))
7583    ;; Find the first unread article.
7584    (t
7585     (let ((data gnus-newsgroup-data))
7586       (while (and data
7587                   (let ((num (gnus-data-number (car data))))
7588                     (or (memq num gnus-newsgroup-unfetched)
7589                         (not (or (and unread
7590                                       (memq num gnus-newsgroup-unreads))
7591                                  (and undownloaded
7592                                       (memq num gnus-newsgroup-undownloaded))
7593                                  (and unseen
7594                                       (memq num gnus-newsgroup-unseen)
7595                                       (memq num gnus-newsgroup-unreads)))))))
7596         (setq data (cdr data)))
7597       (prog1
7598           (if data
7599               (progn
7600                 (goto-char (gnus-data-pos (car data)))
7601                 (gnus-data-number (car data)))
7602             (gnus-message 3 "No more%s articles"
7603                           (let* ((r (when unread " unread"))
7604                                  (d (when undownloaded " undownloaded"))
7605                                  (s (when unseen " unseen"))
7606                                  (l (delq nil (list r d s))))
7607                             (cond ((= 3 (length l))
7608                                    (concat r "," d ", or" s))
7609                                   ((= 2 (length l))
7610                                    (concat (car l) ", or" (cadr l)))
7611                                   ((= 1 (length l))
7612                                    (car l))
7613                                   (t
7614                                    ""))))
7615             nil
7616             )
7617         (gnus-summary-position-point))))))
7618
7619 (defun gnus-summary-next-subject (n &optional unread dont-display)
7620   "Go to next N'th summary line.
7621 If N is negative, go to the previous N'th subject line.
7622 If UNREAD is non-nil, only unread articles are selected.
7623 The difference between N and the actual number of steps taken is
7624 returned."
7625   (interactive "p")
7626   (let ((backward (< n 0))
7627         (n (abs n)))
7628     (while (and (> n 0)
7629                 (if backward
7630                     (gnus-summary-find-prev unread)
7631                   (gnus-summary-find-next unread)))
7632       (unless (zerop (setq n (1- n)))
7633         (gnus-summary-show-thread)))
7634     (when (/= 0 n)
7635       (gnus-message 7 "No more%s articles"
7636                     (if unread " unread" "")))
7637     (unless dont-display
7638       (gnus-summary-recenter)
7639       (gnus-summary-position-point))
7640     n))
7641
7642 (defun gnus-summary-next-unread-subject (n)
7643   "Go to next N'th unread summary line."
7644   (interactive "p")
7645   (gnus-summary-next-subject n t))
7646
7647 (defun gnus-summary-prev-subject (n &optional unread)
7648   "Go to previous N'th summary line.
7649 If optional argument UNREAD is non-nil, only unread article is selected."
7650   (interactive "p")
7651   (gnus-summary-next-subject (- n) unread))
7652
7653 (defun gnus-summary-prev-unread-subject (n)
7654   "Go to previous N'th unread summary line."
7655   (interactive "p")
7656   (gnus-summary-next-subject (- n) t))
7657
7658 (defun gnus-summary-goto-subjects (articles)
7659   "Insert the subject header for ARTICLES in the current buffer."
7660   (save-excursion
7661     (dolist (article articles)
7662       (gnus-summary-goto-subject article t)))
7663   (gnus-summary-limit (append articles gnus-newsgroup-limit))
7664   (gnus-summary-position-point))
7665
7666 (defun gnus-summary-goto-subject (article &optional force silent)
7667   "Go to the subject line of ARTICLE.
7668 If FORCE, also allow jumping to articles not currently shown."
7669   (interactive "nArticle number: ")
7670   (unless (numberp article)
7671     (error "Article %s is not a number" article))
7672   (let ((b (point))
7673         (data (gnus-data-find article)))
7674     ;; We read in the article if we have to.
7675     (and (not data)
7676          force
7677          (gnus-summary-insert-subject
7678           article
7679           (if (or (numberp force) (vectorp force)) force)
7680           t)
7681          (setq data (gnus-data-find article)))
7682     (goto-char b)
7683     (if (not data)
7684         (progn
7685           (unless silent
7686             (gnus-message 3 "Can't find article %d" article))
7687           nil)
7688       (let ((pt (gnus-data-pos data)))
7689         (goto-char pt)
7690         (gnus-summary-set-article-display-arrow pt))
7691       (gnus-summary-position-point)
7692       article)))
7693
7694 ;; Walking around summary lines with displaying articles.
7695
7696 (defun gnus-summary-expand-window (&optional arg)
7697   "Make the summary buffer take up the entire Emacs frame.
7698 Given a prefix, will force an `article' buffer configuration."
7699   (interactive "P")
7700   (if arg
7701       (gnus-configure-windows 'article 'force)
7702     (gnus-configure-windows 'summary 'force)))
7703
7704 (defun gnus-summary-display-article (article &optional all-header)
7705   "Display ARTICLE in article buffer."
7706   (unless (and (gnus-buffer-live-p gnus-article-buffer)
7707                (with-current-buffer gnus-article-buffer
7708                  (derived-mode-p 'gnus-article-mode)))
7709     (gnus-article-setup-buffer))
7710   (gnus-set-global-variables)
7711   (with-current-buffer gnus-article-buffer
7712     (setq gnus-article-charset gnus-newsgroup-charset)
7713     (setq gnus-article-ignored-charsets gnus-newsgroup-ignored-charsets)
7714     (mm-enable-multibyte))
7715   (if (null article)
7716       nil
7717     (prog1
7718         (if gnus-summary-display-article-function
7719             (funcall gnus-summary-display-article-function article all-header)
7720           (gnus-article-prepare article all-header))
7721       (gnus-run-hooks 'gnus-select-article-hook)
7722       (when (and gnus-current-article
7723                  (not (zerop gnus-current-article)))
7724         (gnus-summary-goto-subject gnus-current-article))
7725       (gnus-summary-recenter)
7726       (when (and gnus-use-trees gnus-show-threads)
7727         (gnus-possibly-generate-tree article)
7728         (gnus-highlight-selected-tree article))
7729       ;; Successfully display article.
7730       (gnus-article-set-window-start
7731        (cdr (assq article gnus-newsgroup-bookmarks))))))
7732
7733 (defun gnus-summary-select-article (&optional all-headers force pseudo article)
7734   "Select the current article.
7735 If ALL-HEADERS is non-nil, show all header fields.  If FORCE is
7736 non-nil, the article will be re-fetched even if it already present in
7737 the article buffer.  If PSEUDO is non-nil, pseudo-articles will also
7738 be displayed."
7739   ;; Make sure we are in the summary buffer to work around bbdb bug.
7740   (unless (derived-mode-p 'gnus-summary-mode)
7741     (set-buffer gnus-summary-buffer))
7742   (let ((article (or article (gnus-summary-article-number)))
7743         (all-headers (not (not all-headers))) ;Must be t or nil.
7744         gnus-summary-display-article-function)
7745     (and (not pseudo)
7746          (gnus-summary-article-pseudo-p article)
7747          (error "This is a pseudo-article"))
7748     (with-current-buffer gnus-summary-buffer
7749       (if (or (and gnus-single-article-buffer
7750                    (or (null gnus-current-article)
7751                        (null gnus-article-current)
7752                        (null (get-buffer gnus-article-buffer))
7753                        (not (eq article (cdr gnus-article-current)))
7754                        (not (equal (car gnus-article-current)
7755                                    gnus-newsgroup-name))
7756                        (not (get-buffer gnus-original-article-buffer))))
7757               (and (not gnus-single-article-buffer)
7758                    (or (null gnus-current-article)
7759                        (not (get-buffer gnus-original-article-buffer))
7760                        (not (eq gnus-current-article article))))
7761               force)
7762           ;; The requested article is different from the current article.
7763           (progn
7764             (gnus-summary-display-article article all-headers)
7765             (when (gnus-buffer-live-p gnus-article-buffer)
7766               (with-current-buffer gnus-article-buffer
7767                 (if (not gnus-article-decoded-p) ;; a local variable
7768                     (mm-disable-multibyte))))
7769             (gnus-article-set-window-start
7770              (cdr (assq article gnus-newsgroup-bookmarks)))
7771             article)
7772         'old))))
7773
7774 (defun gnus-summary-force-verify-and-decrypt ()
7775   "Display buttons for signed/encrypted parts and verify/decrypt them."
7776   (interactive)
7777   (let ((mm-verify-option 'known)
7778         (mm-decrypt-option 'known)
7779         (gnus-article-emulate-mime t)
7780         (gnus-buttonized-mime-types (append (list "multipart/signed"
7781                                                   "multipart/encrypted")
7782                                             gnus-buttonized-mime-types)))
7783     (gnus-summary-select-article nil 'force)))
7784
7785 (defun gnus-summary-next-article (&optional unread subject backward push)
7786   "Select the next article.
7787 If UNREAD, only unread articles are selected.
7788 If SUBJECT, only articles with SUBJECT are selected.
7789 If BACKWARD, the previous article is selected instead of the next."
7790   (interactive "P")
7791   ;; Make sure we are in the summary buffer.
7792   (unless (derived-mode-p 'gnus-summary-mode)
7793     (set-buffer gnus-summary-buffer))
7794   (cond
7795    ;; Is there such an article?
7796    ((and (gnus-summary-search-forward unread subject backward)
7797          (or (gnus-summary-display-article (gnus-summary-article-number))
7798              (eq (gnus-summary-article-mark) gnus-canceled-mark)))
7799     (gnus-summary-position-point))
7800    ;; If not, we try the first unread, if that is wanted.
7801    ((and subject
7802          gnus-auto-select-same
7803          (gnus-summary-first-unread-article))
7804     (gnus-summary-position-point)
7805     (gnus-message 6 "Wrapped"))
7806    ;; Try to get next/previous article not displayed in this group.
7807    ((and gnus-auto-extend-newsgroup
7808          (not unread) (not subject))
7809     (gnus-summary-goto-article
7810      (if backward (1- gnus-newsgroup-begin) (1+ gnus-newsgroup-end))
7811      nil (count-lines (point-min) (point))))
7812    ;; Go to next/previous group.
7813    (t
7814     (unless (gnus-ephemeral-group-p gnus-newsgroup-name)
7815       (gnus-summary-jump-to-group gnus-newsgroup-name))
7816     (let ((cmd (if (featurep 'xemacs)
7817                    last-command-char
7818                  last-command-event))
7819           (point
7820            (with-current-buffer gnus-group-buffer
7821              (point)))
7822           (current-summary (current-buffer))
7823           (group
7824            (if (eq gnus-keep-same-level 'best)
7825                (gnus-summary-best-group gnus-newsgroup-name)
7826              (gnus-summary-search-group backward gnus-keep-same-level))))
7827       ;; Select next unread newsgroup automagically.
7828       (cond
7829        ((or (not gnus-auto-select-next)
7830             (not cmd))
7831         (gnus-message 7 "No more%s articles" (if unread " unread" "")))
7832        ((or (eq gnus-auto-select-next 'quietly)
7833             (and (eq gnus-auto-select-next 'slightly-quietly)
7834                  push)
7835             (and (eq gnus-auto-select-next 'almost-quietly)
7836                  (gnus-summary-last-article-p)))
7837         ;; Select quietly.
7838         (if (gnus-ephemeral-group-p gnus-newsgroup-name)
7839             (gnus-summary-exit)
7840           (gnus-message 7 "No more%s articles (%s)..."
7841                         (if unread " unread" "")
7842                         (if group (concat "selecting " group)
7843                           "exiting"))
7844           (gnus-summary-next-group nil group backward)))
7845        (t
7846         (when (gnus-key-press-event-p last-input-event)
7847           ;; Somehow or other, we may now have selected a different
7848           ;; window.  Make point go back to the summary buffer.
7849           (when (eq current-summary (current-buffer))
7850             ;; FIXME: This burps when get-buffer-window returns nil.
7851             (select-window (get-buffer-window current-summary 0)))
7852           (gnus-summary-walk-group-buffer
7853            gnus-newsgroup-name cmd unread backward point))))))))
7854
7855 (defun gnus-summary-walk-group-buffer (from-group cmd unread backward start)
7856   (let ((keystrokes '((?\C-n (gnus-group-next-unread-group 1))
7857                       (?\C-p (gnus-group-prev-unread-group 1))))
7858         (cursor-in-echo-area t)
7859         keve key group ended prompt)
7860     (with-current-buffer gnus-group-buffer
7861       (goto-char start)
7862       (setq group
7863             (if (eq gnus-keep-same-level 'best)
7864                 (gnus-summary-best-group gnus-newsgroup-name)
7865               (gnus-summary-search-group backward gnus-keep-same-level))))
7866     (while (not ended)
7867       (setq prompt
7868             (format
7869              "No more%s articles%s " (if unread " unread" "")
7870              (if (and group
7871                       (not (gnus-ephemeral-group-p gnus-newsgroup-name)))
7872                  (format " (Type %s for %s [%s])"
7873                          (single-key-description cmd)
7874                          (gnus-group-decoded-name group)
7875                          (gnus-group-unread group))
7876                (format " (Type %s to exit %s)"
7877                        (single-key-description cmd)
7878                        (gnus-group-decoded-name gnus-newsgroup-name)))))
7879       ;; Confirm auto selection.
7880       (setq key (car (setq keve (gnus-read-event-char prompt)))
7881             ended t)
7882       (cond
7883        ((assq key keystrokes)
7884         (let ((obuf (current-buffer)))
7885           (switch-to-buffer gnus-group-buffer)
7886           (when group
7887             (gnus-group-jump-to-group group))
7888           (eval (cadr (assq key keystrokes)))
7889           (setq group (gnus-group-group-name))
7890           (switch-to-buffer obuf))
7891         (setq ended nil))
7892        ((equal key cmd)
7893         (if (or (not group)
7894                 (gnus-ephemeral-group-p gnus-newsgroup-name))
7895             (gnus-summary-exit)
7896           (gnus-summary-next-group nil group backward)))
7897        (t
7898         (push (cdr keve) unread-command-events))))))
7899
7900 (defun gnus-summary-next-unread-article ()
7901   "Select unread article after current one."
7902   (interactive)
7903   (gnus-summary-next-article
7904    (or (not (eq gnus-summary-goto-unread 'never))
7905        (gnus-summary-last-article-p (gnus-summary-article-number)))
7906    (and gnus-auto-select-same
7907         (gnus-summary-article-subject))))
7908
7909 (defun gnus-summary-prev-article (&optional unread subject)
7910   "Select the article before the current one.
7911 If UNREAD is non-nil, only unread articles are selected."
7912   (interactive "P")
7913   (gnus-summary-next-article unread subject t))
7914
7915 (defun gnus-summary-prev-unread-article ()
7916   "Select unread article before current one."
7917   (interactive)
7918   (gnus-summary-prev-article
7919    (or (not (eq gnus-summary-goto-unread 'never))
7920        (gnus-summary-first-article-p (gnus-summary-article-number)))
7921    (and gnus-auto-select-same
7922         (gnus-summary-article-subject))))
7923
7924 (declare-function gnus-article-only-boring-p "gnus-art" ())
7925
7926 (defun gnus-summary-next-page (&optional lines circular stop)
7927   "Show next page of the selected article.
7928 If at the end of the current article, select the next article.
7929 LINES says how many lines should be scrolled up.
7930
7931 If CIRCULAR is non-nil, go to the start of the article instead of
7932 selecting the next article when reaching the end of the current
7933 article.
7934
7935 If STOP is non-nil, just stop when reaching the end of the message.
7936
7937 Also see the variable `gnus-article-skip-boring'."
7938   (interactive "P")
7939   (gnus-set-global-variables)
7940   (let ((article (gnus-summary-article-number))
7941         (article-window (get-buffer-window gnus-article-buffer t))
7942         endp)
7943     ;; If the buffer is empty, we have no article.
7944     (unless article
7945       (error "No article to select"))
7946     (gnus-configure-windows 'article)
7947     (if (eq (cdr (assq article gnus-newsgroup-reads)) gnus-canceled-mark)
7948         (if (and (eq gnus-summary-goto-unread 'never)
7949                  (not (gnus-summary-last-article-p article)))
7950             (gnus-summary-next-article)
7951           (gnus-summary-next-unread-article))
7952       (if (or (null gnus-current-article)
7953               (null gnus-article-current)
7954               (/= article (cdr gnus-article-current))
7955               (not (equal (car gnus-article-current) gnus-newsgroup-name)))
7956           ;; Selected subject is different from current article's.
7957           (gnus-summary-display-article article)
7958         (when article-window
7959           (gnus-eval-in-buffer-window gnus-article-buffer
7960             (setq endp (or (gnus-article-next-page lines)
7961                            (gnus-article-only-boring-p))))
7962           (when endp
7963             (cond ((or stop gnus-summary-stop-at-end-of-message)
7964                    (gnus-message 3 "End of message"))
7965                   (circular
7966                    (gnus-summary-beginning-of-article))
7967                   (lines
7968                    (gnus-message 3 "End of message"))
7969                   ((null lines)
7970                    (if (and (eq gnus-summary-goto-unread 'never)
7971                             (not (gnus-summary-last-article-p article)))
7972                        (gnus-summary-next-article)
7973                      (gnus-summary-next-unread-article))))))))
7974     (gnus-summary-recenter)
7975     (gnus-summary-position-point)))
7976
7977 (defun gnus-summary-prev-page (&optional lines move)
7978   "Show previous page of selected article.
7979 Argument LINES specifies lines to be scrolled down.
7980 If MOVE, move to the previous unread article if point is at
7981 the beginning of the buffer."
7982   (interactive "P")
7983   (let ((article (gnus-summary-article-number))
7984         (article-window (get-buffer-window gnus-article-buffer t))
7985         endp)
7986     (gnus-configure-windows 'article)
7987     (if (or (null gnus-current-article)
7988             (null gnus-article-current)
7989             (/= article (cdr gnus-article-current))
7990             (not (equal (car gnus-article-current) gnus-newsgroup-name)))
7991         ;; Selected subject is different from current article's.
7992         (gnus-summary-display-article article)
7993       (gnus-summary-recenter)
7994       (when article-window
7995         (gnus-eval-in-buffer-window gnus-article-buffer
7996           (setq endp (gnus-article-prev-page lines)))
7997         (when (and move endp)
7998           (cond (lines
7999                  (gnus-message 3 "Beginning of message"))
8000                 ((null lines)
8001                  (if (and (eq gnus-summary-goto-unread 'never)
8002                           (not (gnus-summary-first-article-p article)))
8003                      (gnus-summary-prev-article)
8004                    (gnus-summary-prev-unread-article))))))))
8005   (gnus-summary-position-point))
8006
8007 (defun gnus-summary-prev-page-or-article (&optional lines)
8008   "Show previous page of selected article.
8009 Argument LINES specifies lines to be scrolled down.
8010 If at the beginning of the article, go to the next article."
8011   (interactive "P")
8012   (gnus-summary-prev-page lines t))
8013
8014 (defun gnus-summary-scroll-up (lines)
8015   "Scroll up (or down) one line current article.
8016 Argument LINES specifies lines to be scrolled up (or down if negative).
8017 If no article is selected, then the current article will be selected first."
8018   (interactive "p")
8019   (gnus-configure-windows 'article)
8020   (gnus-summary-show-thread)
8021   (when (eq (gnus-summary-select-article nil nil 'pseudo) 'old)
8022     (gnus-eval-in-buffer-window gnus-article-buffer
8023       (cond ((> lines 0)
8024              (when (gnus-article-next-page lines)
8025                (gnus-message 3 "End of message")))
8026             ((< lines 0)
8027              (gnus-article-prev-page (- lines))))))
8028   (gnus-summary-recenter)
8029   (gnus-summary-position-point))
8030
8031 (defun gnus-summary-scroll-down (lines)
8032   "Scroll down (or up) one line current article.
8033 Argument LINES specifies lines to be scrolled down (or up if negative).
8034 If no article is selected, then the current article will be selected first."
8035   (interactive "p")
8036   (gnus-summary-scroll-up (- lines)))
8037
8038 (defun gnus-summary-next-same-subject ()
8039   "Select next article which has the same subject as current one."
8040   (interactive)
8041   (gnus-summary-next-article nil (gnus-summary-article-subject)))
8042
8043 (defun gnus-summary-prev-same-subject ()
8044   "Select previous article which has the same subject as current one."
8045   (interactive)
8046   (gnus-summary-prev-article nil (gnus-summary-article-subject)))
8047
8048 (defun gnus-summary-next-unread-same-subject ()
8049   "Select next unread article which has the same subject as current one."
8050   (interactive)
8051   (gnus-summary-next-article t (gnus-summary-article-subject)))
8052
8053 (defun gnus-summary-prev-unread-same-subject ()
8054   "Select previous unread article which has the same subject as current one."
8055   (interactive)
8056   (gnus-summary-prev-article t (gnus-summary-article-subject)))
8057
8058 (defun gnus-summary-first-unread-article ()
8059   "Select the first unread article.
8060 Return nil if there are no unread articles."
8061   (interactive)
8062   (prog1
8063       (when (gnus-summary-first-subject t)
8064         (gnus-summary-show-thread)
8065         (gnus-summary-first-subject t)
8066         (gnus-summary-display-article (gnus-summary-article-number)))
8067     (gnus-summary-position-point)))
8068
8069 (defun gnus-summary-first-unread-subject ()
8070   "Place the point on the subject line of the first unread article.
8071 Return nil if there are no unread articles."
8072   (interactive)
8073   (prog1
8074       (when (gnus-summary-first-subject t)
8075         (gnus-summary-show-thread)
8076         (gnus-summary-first-subject t))
8077     (gnus-summary-position-point)))
8078
8079 (defun gnus-summary-first-unseen-subject ()
8080   "Place the point on the subject line of the first unseen article.
8081 Return nil if there are no unseen articles."
8082   (interactive)
8083   (prog1
8084       (when (gnus-summary-first-subject nil nil t)
8085         (gnus-summary-show-thread)
8086         (gnus-summary-first-subject nil nil t))
8087     (gnus-summary-position-point)))
8088
8089 (defun gnus-summary-first-unseen-or-unread-subject ()
8090   "Place the point on the subject line of the first unseen and unread article.
8091 If all article have been seen, on the subject line of the first unread
8092 article."
8093   (interactive)
8094   (prog1
8095       (unless (when (gnus-summary-first-subject nil nil t)
8096                 (gnus-summary-show-thread)
8097                 (gnus-summary-first-subject nil nil t))
8098         (when (gnus-summary-first-subject t)
8099           (gnus-summary-show-thread)
8100           (gnus-summary-first-subject t)))
8101     (gnus-summary-position-point)))
8102
8103 (defun gnus-summary-first-article ()
8104   "Select the first article.
8105 Return nil if there are no articles."
8106   (interactive)
8107   (prog1
8108       (when (gnus-summary-first-subject)
8109         (gnus-summary-show-thread)
8110         (gnus-summary-first-subject)
8111         (gnus-summary-display-article (gnus-summary-article-number)))
8112     (gnus-summary-position-point)))
8113
8114 (defun gnus-summary-best-unread-article (&optional arg)
8115   "Select the unread article with the highest score.
8116 If given a prefix argument, select the next unread article that has a
8117 score higher than the default score."
8118   (interactive "P")
8119   (let ((article (if arg
8120                      (gnus-summary-better-unread-subject)
8121                    (gnus-summary-best-unread-subject))))
8122     (if article
8123         (gnus-summary-goto-article article)
8124       (error "No unread articles"))))
8125
8126 (defun gnus-summary-best-unread-subject ()
8127   "Select the unread subject with the highest score."
8128   (interactive)
8129   (let ((best -1000000)
8130         (data gnus-newsgroup-data)
8131         article score)
8132     (while data
8133       (and (gnus-data-unread-p (car data))
8134            (> (setq score
8135                     (gnus-summary-article-score (gnus-data-number (car data))))
8136               best)
8137            (setq best score
8138                  article (gnus-data-number (car data))))
8139       (setq data (cdr data)))
8140     (when article
8141       (gnus-summary-goto-subject article))
8142     (gnus-summary-position-point)
8143     article))
8144
8145 (defun gnus-summary-better-unread-subject ()
8146   "Select the first unread subject that has a score over the default score."
8147   (interactive)
8148   (let ((data gnus-newsgroup-data)
8149         article score)
8150     (while (and (setq article (gnus-data-number (car data)))
8151                 (or (gnus-data-read-p (car data))
8152                     (not (> (gnus-summary-article-score article)
8153                             gnus-summary-default-score))))
8154       (setq data (cdr data)))
8155     (when article
8156       (gnus-summary-goto-subject article))
8157     (gnus-summary-position-point)
8158     article))
8159
8160 (defun gnus-summary-last-subject ()
8161   "Go to the last displayed subject line in the group."
8162   (let ((article (gnus-data-number (car (gnus-data-list t)))))
8163     (when article
8164       (gnus-summary-goto-subject article))))
8165
8166 (defun gnus-summary-goto-article (article &optional all-headers force)
8167   "Fetch ARTICLE (article number or Message-ID) and display it if it exists.
8168 If ALL-HEADERS is non-nil, no header lines are hidden.
8169 If FORCE, go to the article even if it isn't displayed.  If FORCE
8170 is a number, it is the line the article is to be displayed on."
8171   (interactive
8172    (list
8173     (gnus-completing-read
8174      "Article number or Message-ID"
8175      (mapcar 'int-to-string gnus-newsgroup-limit))
8176     current-prefix-arg
8177     t))
8178   (prog1
8179       (if (and (stringp article)
8180                (string-match "@\\|%40" article))
8181           (gnus-summary-refer-article article)
8182         (when (stringp article)
8183           (setq article (string-to-number article)))
8184         (if (gnus-summary-goto-subject article force)
8185             (gnus-summary-display-article article all-headers)
8186           (gnus-message 4 "Couldn't go to article %s" article) nil))
8187     (gnus-summary-position-point)))
8188
8189 (defun gnus-summary-goto-last-article ()
8190   "Go to the previously read article."
8191   (interactive)
8192   (prog1
8193       (when gnus-last-article
8194         (gnus-summary-goto-article gnus-last-article nil t))
8195     (gnus-summary-position-point)))
8196
8197 (defun gnus-summary-pop-article (number)
8198   "Pop one article off the history and go to the previous.
8199 NUMBER articles will be popped off."
8200   (interactive "p")
8201   (let (to)
8202     (setq gnus-newsgroup-history
8203           (cdr (setq to (nthcdr number gnus-newsgroup-history))))
8204     (if to
8205         (gnus-summary-goto-article (car to) nil t)
8206       (error "Article history empty")))
8207   (gnus-summary-position-point))
8208
8209 ;; Summary commands and functions for limiting the summary buffer.
8210
8211 (defun gnus-summary-limit-to-articles (n)
8212   "Limit the summary buffer to the next N articles.
8213 If not given a prefix, use the process marked articles instead."
8214   (interactive "P")
8215   (prog1
8216       (let ((articles (gnus-summary-work-articles n)))
8217         (setq gnus-newsgroup-processable nil)
8218         (gnus-summary-limit articles))
8219     (gnus-summary-position-point)))
8220
8221 (defun gnus-summary-pop-limit (&optional total)
8222   "Restore the previous limit.
8223 If given a prefix, remove all limits."
8224   (interactive "P")
8225   (when total
8226     (setq gnus-newsgroup-limits
8227           (list (mapcar (lambda (h) (mail-header-number h))
8228                         gnus-newsgroup-headers))))
8229   (unless gnus-newsgroup-limits
8230     (error "No limit to pop"))
8231   (prog1
8232       (gnus-summary-limit nil 'pop)
8233     (gnus-summary-position-point)))
8234
8235 (defun gnus-summary-limit-to-subject (subject &optional header not-matching)
8236   "Limit the summary buffer to articles that have subjects that match a regexp.
8237 If NOT-MATCHING, excluding articles that have subjects that match a regexp."
8238   (interactive
8239    (list (read-string (if current-prefix-arg
8240                           "Exclude subject (regexp): "
8241                         "Limit to subject (regexp): "))
8242          nil current-prefix-arg))
8243   (unless header
8244     (setq header "subject"))
8245   (when (not (equal "" subject))
8246     (prog1
8247         (let ((articles (gnus-summary-find-matching
8248                          (or header "subject") subject 'all nil nil
8249                          not-matching)))
8250           (unless articles
8251             (error "Found no matches for \"%s\"" subject))
8252           (gnus-summary-limit articles))
8253       (gnus-summary-position-point))))
8254
8255 (defun gnus-summary-limit-to-author (from &optional not-matching)
8256   "Limit the summary buffer to articles that have authors that match a regexp.
8257 If NOT-MATCHING, excluding articles that have authors that match a regexp."
8258   (interactive
8259    (list (let* ((header (gnus-summary-article-header))
8260                 (default (and header (car (mail-header-parse-address
8261                                            (mail-header-from header))))))
8262            (read-string (concat (if current-prefix-arg
8263                                     "Exclude author (regexp"
8264                                   "Limit to author (regexp")
8265                                 (if default
8266                                     (concat ", default \"" default "\"): ")
8267                                   "): "))
8268                         nil nil
8269                         default))
8270          current-prefix-arg))
8271   (gnus-summary-limit-to-subject from "from" not-matching))
8272
8273 (defun gnus-summary-limit-to-recipient (recipient &optional not-matching)
8274   "Limit the summary buffer to articles with the given RECIPIENT.
8275
8276 If NOT-MATCHING, exclude RECIPIENT.
8277
8278 To and Cc headers are checked.  You need to include them in
8279 `nnmail-extra-headers'."
8280   ;; Unlike `rmail-summary-by-recipients', doesn't include From.
8281   (interactive
8282    (list (read-string (format "%s recipient (regexp): "
8283                               (if current-prefix-arg "Exclude" "Limit to")))
8284          current-prefix-arg))
8285   (when (not (equal "" recipient))
8286     (prog1 (let* ((to
8287                    (if (memq 'To nnmail-extra-headers)
8288                        (gnus-summary-find-matching
8289                         (cons 'extra 'To) recipient 'all nil nil
8290                         not-matching)
8291                      (gnus-message
8292                       1 "`To' isn't present in `nnmail-extra-headers'")
8293                      (sit-for 1)
8294                      nil))
8295                   (cc
8296                    (if (memq 'Cc nnmail-extra-headers)
8297                        (gnus-summary-find-matching
8298                         (cons 'extra 'Cc) recipient 'all nil nil
8299                         not-matching)
8300                      (gnus-message
8301                       1 "`Cc' isn't present in `nnmail-extra-headers'")
8302                      (sit-for 1)
8303                      nil))
8304                   (articles
8305                    (if not-matching
8306                        ;; We need the numbers that are in both lists:
8307                        (mapcar (lambda (a)
8308                                  (and (memq a to) a))
8309                                cc)
8310                      (nconc to cc))))
8311              (unless articles
8312                (error "Found no matches for \"%s\"" recipient))
8313              (gnus-summary-limit articles))
8314       (gnus-summary-position-point))))
8315
8316 (defun gnus-summary-limit-to-address (address &optional not-matching)
8317   "Limit the summary buffer to articles with the given ADDRESS.
8318
8319 If NOT-MATCHING, exclude ADDRESS.
8320
8321 To, Cc and From headers are checked.  You need to include `To' and `Cc'
8322 in `nnmail-extra-headers'."
8323   (interactive
8324    (list (read-string (format "%s address (regexp): "
8325                               (if current-prefix-arg "Exclude" "Limit to")))
8326          current-prefix-arg))
8327   (when (not (equal "" address))
8328     (prog1 (let* ((to
8329                    (if (memq 'To nnmail-extra-headers)
8330                        (gnus-summary-find-matching
8331                         (cons 'extra 'To) address 'all nil nil
8332                         not-matching)
8333                      (gnus-message
8334                       1 "`To' isn't present in `nnmail-extra-headers'")
8335                      (sit-for 1)
8336                      t))
8337                   (cc
8338                    (if (memq 'Cc nnmail-extra-headers)
8339                        (gnus-summary-find-matching
8340                         (cons 'extra 'Cc) address 'all nil nil
8341                         not-matching)
8342                      (gnus-message
8343                       1 "`Cc' isn't present in `nnmail-extra-headers'")
8344                      (sit-for 1)
8345                      t))
8346                   (from
8347                    (gnus-summary-find-matching "from" address
8348                                                'all nil nil not-matching))
8349                   (articles
8350                    (if not-matching
8351                        ;; We need the numbers that are in all lists:
8352                        (if (eq cc t)
8353                            (if (eq to t)
8354                                from
8355                              (mapcar (lambda (a) (car (memq a from))) to))
8356                          (if (eq to t)
8357                              (mapcar (lambda (a) (car (memq a from))) cc)
8358                            (mapcar (lambda (a) (car (memq a from)))
8359                                    (mapcar (lambda (a) (car (memq a to)))
8360                                            cc))))
8361                      (nconc (if (eq to t) nil to)
8362                             (if (eq cc t) nil cc)
8363                             from))))
8364              (unless articles
8365                (error "Found no matches for \"%s\"" address))
8366              (gnus-summary-limit articles))
8367       (gnus-summary-position-point))))
8368
8369 (defun gnus-summary-limit-strange-charsets-predicate (header)
8370   (when (fboundp 'char-charset)
8371     (let ((string (concat (mail-header-subject header)
8372                           (mail-header-from header)))
8373           charset found)
8374       (dotimes (i (1- (length string)))
8375         (setq charset (format "%s" (char-charset (aref string (1+ i)))))
8376         (when (string-match "unicode\\|big\\|japanese" charset)
8377           (setq found t)))
8378       found)))
8379
8380 (defun gnus-summary-limit-to-predicate (predicate)
8381   "Limit to articles where PREDICATE returns non-nil.
8382 PREDICATE will be called with the header structures of the
8383 articles."
8384   (let ((articles nil)
8385         (case-fold-search t))
8386     (dolist (header gnus-newsgroup-headers)
8387       (when (funcall predicate header)
8388         (push (mail-header-number header) articles)))
8389     (gnus-summary-limit (nreverse articles))))
8390
8391 (defun gnus-summary-limit-to-age (age &optional younger-p)
8392   "Limit the summary buffer to articles that are older than (or equal) AGE days.
8393 If YOUNGER-P (the prefix) is non-nil, limit the summary buffer to
8394 articles that are younger than AGE days."
8395   (interactive
8396    (let ((younger current-prefix-arg)
8397          (days-got nil)
8398          days)
8399      (while (not days-got)
8400        (setq days (if younger
8401                       (read-string "Limit to articles younger than (in days, older when negative): ")
8402                     (read-string
8403                      "Limit to articles older than (in days, younger when negative): ")))
8404        (when (> (length days) 0)
8405          (setq days (read days)))
8406        (if (numberp days)
8407            (progn
8408              (setq days-got t)
8409              (when (< days 0)
8410                (setq younger (not younger))
8411                (setq days (* days -1))))
8412          (message "Please enter a number.")
8413          (sleep-for 1)))
8414      (list days younger)))
8415   (prog1
8416       (let ((data gnus-newsgroup-data)
8417             (cutoff (days-to-time age))
8418             articles d date is-younger)
8419         (while (setq d (pop data))
8420           (when (and (vectorp (gnus-data-header d))
8421                      (setq date (mail-header-date (gnus-data-header d))))
8422             (setq is-younger (time-less-p
8423                               (time-since (gnus-date-get-time date))
8424                               cutoff))
8425             (when (if younger-p
8426                       is-younger
8427                     (not is-younger))
8428               (push (gnus-data-number d) articles))))
8429         (gnus-summary-limit (nreverse articles)))
8430     (gnus-summary-position-point)))
8431
8432 (defun gnus-summary-limit-to-extra (header regexp &optional not-matching)
8433   "Limit the summary buffer to articles that match an `extra' header."
8434   (interactive
8435    (let ((header
8436           (intern
8437            (gnus-completing-read
8438             (if current-prefix-arg
8439                 "Exclude extra header"
8440               "Limit extra header")
8441             (mapcar 'symbol-name gnus-extra-headers)
8442             t nil nil
8443             (symbol-name (car gnus-extra-headers))))))
8444      (list header
8445            (read-string (format "%s header %s (regexp): "
8446                                 (if current-prefix-arg "Exclude" "Limit to")
8447                                 header))
8448            current-prefix-arg)))
8449   (when (not (equal "" regexp))
8450     (prog1
8451         (let ((articles (gnus-summary-find-matching
8452                          (cons 'extra header) regexp 'all nil nil
8453                          not-matching)))
8454           (unless articles
8455             (error "Found no matches for \"%s\"" regexp))
8456           (gnus-summary-limit articles))
8457       (gnus-summary-position-point))))
8458
8459 (defun gnus-summary-limit-to-display-predicate ()
8460   "Limit the summary buffer to the predicated in the `display' group parameter."
8461   (interactive)
8462   (unless gnus-newsgroup-display
8463     (error "There is no `display' group parameter"))
8464   (let (articles)
8465     (dolist (gnus-number gnus-newsgroup-articles)
8466       (when (funcall gnus-newsgroup-display)
8467         (push gnus-number articles)))
8468     (gnus-summary-limit articles))
8469   (gnus-summary-position-point))
8470
8471 (defun gnus-summary-limit-to-unread (&optional all)
8472   "Limit the summary buffer to articles that are not marked as read.
8473 If ALL is non-nil, limit strictly to unread articles."
8474   (interactive "P")
8475   (if all
8476       (gnus-summary-limit-to-marks (char-to-string gnus-unread-mark))
8477     (gnus-summary-limit-to-marks
8478      ;; Concat all the marks that say that an article is read and have
8479      ;; those removed.
8480      (list gnus-del-mark gnus-read-mark gnus-ancient-mark
8481            gnus-killed-mark gnus-spam-mark gnus-kill-file-mark
8482            gnus-low-score-mark gnus-expirable-mark
8483            gnus-canceled-mark gnus-catchup-mark gnus-sparse-mark
8484            gnus-duplicate-mark)
8485      'reverse)))
8486
8487 (defun gnus-summary-limit-to-headers (match &optional reverse)
8488   "Limit the summary buffer to articles that have headers that match MATCH.
8489 If REVERSE (the prefix), limit to articles that don't match."
8490   (interactive "sMatch headers (regexp): \nP")
8491   (gnus-summary-limit-to-bodies match reverse t))
8492
8493 (declare-function article-goto-body "gnus-art" ())
8494
8495 (defun gnus-summary-limit-to-bodies (match &optional reverse headersp)
8496   "Limit the summary buffer to articles that have bodies that match MATCH.
8497 If REVERSE (the prefix), limit to articles that don't match."
8498   (interactive "sMatch body (regexp): \nP")
8499   (let ((articles nil)
8500         (gnus-select-article-hook nil)  ;Disable hook.
8501         (gnus-article-prepare-hook nil)
8502         (gnus-use-article-prefetch nil)
8503         (gnus-keep-backlog nil)
8504         (gnus-break-pages nil)
8505         (gnus-summary-display-arrow nil)
8506         (gnus-updated-mode-lines nil)
8507         (gnus-auto-center-summary nil)
8508         (gnus-display-mime-function nil))
8509     (dolist (data gnus-newsgroup-data)
8510       (let (gnus-mark-article-hook)
8511         (gnus-summary-select-article t t nil (gnus-data-number data)))
8512       (with-current-buffer gnus-article-buffer
8513         (article-goto-body)
8514         (let* ((case-fold-search t)
8515                (found (if headersp
8516                           (re-search-backward match nil t)
8517                         (re-search-forward match nil t))))
8518           (when (or (and found
8519                          (not reverse))
8520                     (and (not found)
8521                          reverse))
8522             (push (gnus-data-number data) articles)))))
8523     (if (not articles)
8524         (message "No messages matched")
8525       (gnus-summary-limit articles)))
8526   (gnus-summary-position-point))
8527
8528 (defun gnus-summary-limit-to-singletons (&optional threadsp)
8529   "Limit the summary buffer to articles that aren't part on any thread.
8530 If THREADSP (the prefix), limit to articles that are in threads."
8531   (interactive "P")
8532   (let ((articles nil)
8533         thread-articles
8534         threads)
8535     (dolist (thread gnus-newsgroup-threads)
8536       (if (stringp (car thread))
8537           (dolist (thread (cdr thread))
8538             (push thread threads))
8539         (push thread threads)))
8540     (dolist (thread threads)
8541       (setq thread-articles (gnus-articles-in-thread thread))
8542       (when (or (and threadsp
8543                      (> (length thread-articles) 1))
8544                 (and (not threadsp)
8545                      (= (length thread-articles) 1)))
8546         (setq articles (nconc thread-articles articles))))
8547     (if (not articles)
8548         (message "No messages matched")
8549       (gnus-summary-limit articles))
8550     (gnus-summary-position-point)))
8551
8552 (defun gnus-summary-limit-to-replied (&optional unreplied)
8553   "Limit the summary buffer to replied articles.
8554 If UNREPLIED (the prefix), limit to unreplied articles."
8555   (interactive "P")
8556   (if unreplied
8557       (gnus-summary-limit
8558        (gnus-set-difference gnus-newsgroup-articles
8559         gnus-newsgroup-replied))
8560     (gnus-summary-limit gnus-newsgroup-replied))
8561   (gnus-summary-position-point))
8562
8563 (defun gnus-summary-limit-exclude-marks (marks &optional reverse)
8564   "Exclude articles that are marked with MARKS (e.g. \"DK\").
8565 If REVERSE, limit the summary buffer to articles that are marked
8566 with MARKS.  MARKS can either be a string of marks or a list of marks.
8567 Returns how many articles were removed."
8568   (interactive "sMarks: ")
8569   (gnus-summary-limit-to-marks marks t))
8570
8571 (defun gnus-summary-limit-to-marks (marks &optional reverse)
8572   "Limit the summary buffer to articles that are marked with MARKS (e.g. \"DK\").
8573 If REVERSE (the prefix), limit the summary buffer to articles that are
8574 not marked with MARKS.  MARKS can either be a string of marks or a
8575 list of marks.
8576 Returns how many articles were removed."
8577   (interactive "sMarks: \nP")
8578   (prog1
8579       (let ((data gnus-newsgroup-data)
8580             (marks (if (listp marks) marks
8581                      (append marks nil))) ; Transform to list.
8582             articles)
8583         (while data
8584           (when (if reverse (not (memq (gnus-data-mark (car data)) marks))
8585                   (memq (gnus-data-mark (car data)) marks))
8586             (push (gnus-data-number (car data)) articles))
8587           (setq data (cdr data)))
8588         (gnus-summary-limit articles))
8589     (gnus-summary-position-point)))
8590
8591 (defun gnus-summary-limit-to-score (score)
8592   "Limit to articles with score at or above SCORE."
8593   (interactive "NLimit to articles with score of at least: ")
8594   (let ((data gnus-newsgroup-data)
8595         articles)
8596     (while data
8597       (when (>= (gnus-summary-article-score (gnus-data-number (car data)))
8598                 score)
8599         (push (gnus-data-number (car data)) articles))
8600       (setq data (cdr data)))
8601     (prog1
8602         (gnus-summary-limit articles)
8603       (gnus-summary-position-point))))
8604
8605 (defun gnus-summary-limit-to-unseen ()
8606   "Limit to unseen articles."
8607   (interactive)
8608   (prog1
8609       (gnus-summary-limit gnus-newsgroup-unseen)
8610     (gnus-summary-position-point)))
8611
8612 (defun gnus-summary-limit-include-thread (id)
8613   "Display all the hidden articles that is in the thread with ID in it.
8614 When called interactively, ID is the Message-ID of the current
8615 article."
8616   (interactive (list (mail-header-id (gnus-summary-article-header))))
8617   (let ((articles (gnus-articles-in-thread
8618                    (gnus-id-to-thread (gnus-root-id id))))
8619         ;;we REALLY want the whole thread---this prevents cut-threads
8620         ;;from removing the thread we want to include.
8621         (gnus-fetch-old-headers nil)
8622         (gnus-build-sparse-threads nil))
8623     (prog1
8624         (gnus-summary-limit (nconc articles gnus-newsgroup-limit))
8625       (gnus-summary-limit-include-matching-articles
8626        "subject"
8627        (regexp-quote (gnus-simplify-subject-re
8628                       (mail-header-subject (gnus-id-to-header id)))))
8629       (gnus-summary-position-point))))
8630
8631 (defun gnus-summary-limit-include-matching-articles (header regexp)
8632   "Display all the hidden articles that have HEADERs that match REGEXP."
8633   (interactive (list (read-string "Match on header: ")
8634                      (read-string "Regexp: ")))
8635   (let ((articles (gnus-find-matching-articles header regexp)))
8636     (prog1
8637         (gnus-summary-limit (nconc articles gnus-newsgroup-limit))
8638       (gnus-summary-position-point))))
8639
8640 (defun gnus-summary-insert-dormant-articles ()
8641   "Insert all the dormant articles for this group into the current buffer."
8642   (interactive)
8643   (let ((gnus-verbose (max 6 gnus-verbose)))
8644     (if (not gnus-newsgroup-dormant)
8645         (gnus-message 3 "No dormant articles for this group")
8646       (gnus-summary-goto-subjects gnus-newsgroup-dormant))))
8647
8648 (defun gnus-summary-insert-ticked-articles ()
8649   "Insert ticked articles for this group into the current buffer."
8650   (interactive)
8651   (let ((gnus-verbose (max 6 gnus-verbose)))
8652     (if (not gnus-newsgroup-marked)
8653         (gnus-message 3 "No ticked articles for this group")
8654       (gnus-summary-goto-subjects gnus-newsgroup-marked))))
8655
8656 (defun gnus-summary-limit-include-dormant ()
8657   "Display all the hidden articles that are marked as dormant.
8658 Note that this command only works on a subset of the articles currently
8659 fetched for this group."
8660   (interactive)
8661   (unless gnus-newsgroup-dormant
8662     (error "There are no dormant articles in this group"))
8663   (prog1
8664       (gnus-summary-limit (append gnus-newsgroup-dormant gnus-newsgroup-limit))
8665     (gnus-summary-position-point)))
8666
8667 (defun gnus-summary-include-articles (articles)
8668   "Fetch the headers for ARTICLES and then display the summary lines."
8669   (let ((gnus-inhibit-demon t)
8670         (gnus-agent nil)
8671         (gnus-read-all-available-headers t))
8672     (setq gnus-newsgroup-headers
8673           (gnus-merge
8674            'list gnus-newsgroup-headers
8675            (gnus-fetch-headers articles nil t)
8676            'gnus-article-sort-by-number))
8677     (setq gnus-newsgroup-articles
8678           (gnus-sorted-nunion gnus-newsgroup-articles articles))
8679     (gnus-summary-limit (append articles gnus-newsgroup-limit))))
8680
8681 (defun gnus-summary-limit-exclude-dormant ()
8682   "Hide all dormant articles."
8683   (interactive)
8684   (prog1
8685       (gnus-summary-limit-to-marks (list gnus-dormant-mark) 'reverse)
8686     (gnus-summary-position-point)))
8687
8688 (defun gnus-summary-limit-exclude-childless-dormant ()
8689   "Hide all dormant articles that have no children."
8690   (interactive)
8691   (let ((data (gnus-data-list t))
8692         articles d children)
8693     ;; Find all articles that are either not dormant or have
8694     ;; children.
8695     (while (setq d (pop data))
8696       (when (or (not (= (gnus-data-mark d) gnus-dormant-mark))
8697                 (and (setq children
8698                            (gnus-article-children (gnus-data-number d)))
8699                      (let (found)
8700                        (while children
8701                          (when (memq (car children) articles)
8702                            (setq children nil
8703                                  found t))
8704                          (pop children))
8705                        found)))
8706         (push (gnus-data-number d) articles)))
8707     ;; Do the limiting.
8708     (prog1
8709         (gnus-summary-limit articles)
8710       (gnus-summary-position-point))))
8711
8712 (defun gnus-summary-limit-mark-excluded-as-read (&optional all)
8713   "Mark all unread excluded articles as read.
8714 If ALL, mark even excluded ticked and dormants as read."
8715   (interactive "P")
8716   (setq gnus-newsgroup-limit (sort gnus-newsgroup-limit '<))
8717   (let ((articles (gnus-sorted-ndifference
8718                    (sort
8719                     (mapcar (lambda (h) (mail-header-number h))
8720                             gnus-newsgroup-headers)
8721                     '<)
8722                    gnus-newsgroup-limit))
8723         article)
8724     (setq gnus-newsgroup-unreads
8725           (gnus-sorted-intersection gnus-newsgroup-unreads
8726                                     gnus-newsgroup-limit))
8727     (if all
8728         (setq gnus-newsgroup-dormant nil
8729               gnus-newsgroup-marked nil
8730               gnus-newsgroup-reads
8731               (nconc
8732                (mapcar (lambda (n) (cons n gnus-catchup-mark)) articles)
8733                gnus-newsgroup-reads))
8734       (while (setq article (pop articles))
8735         (unless (or (memq article gnus-newsgroup-dormant)
8736                     (memq article gnus-newsgroup-marked))
8737           (push (cons article gnus-catchup-mark) gnus-newsgroup-reads))))))
8738
8739 (defun gnus-summary-limit (articles &optional pop)
8740   (if pop
8741       ;; We pop the previous limit off the stack and use that.
8742       (setq articles (car gnus-newsgroup-limits)
8743             gnus-newsgroup-limits (cdr gnus-newsgroup-limits))
8744     ;; We use the new limit, so we push the old limit on the stack.
8745     (push gnus-newsgroup-limit gnus-newsgroup-limits))
8746   ;; Set the limit.
8747   (setq gnus-newsgroup-limit articles)
8748   (let ((total (length gnus-newsgroup-data))
8749         (data (gnus-data-find-list (gnus-summary-article-number)))
8750         (gnus-summary-mark-below nil)   ; Inhibit this.
8751         found)
8752     ;; This will do all the work of generating the new summary buffer
8753     ;; according to the new limit.
8754     (gnus-summary-prepare)
8755     ;; Hide any threads, possibly.
8756     (gnus-summary-maybe-hide-threads)
8757     ;; Try to return to the article you were at, or one in the
8758     ;; neighborhood.
8759     (when data
8760       ;; We try to find some article after the current one.
8761       (while data
8762         (when (gnus-summary-goto-subject (gnus-data-number (car data)) nil t)
8763           (setq data nil
8764                 found t))
8765         (setq data (cdr data))))
8766     (unless found
8767       ;; If there is no data, that means that we were after the last
8768       ;; article.  The same goes when we can't find any articles
8769       ;; after the current one.
8770       (goto-char (point-max))
8771       (gnus-summary-find-prev))
8772     (gnus-set-mode-line 'summary)
8773     ;; We return how many articles were removed from the summary
8774     ;; buffer as a result of the new limit.
8775     (- total (length gnus-newsgroup-data))))
8776
8777 (defsubst gnus-invisible-cut-children (threads)
8778   (let ((num 0))
8779     (while threads
8780       (when (memq (mail-header-number (caar threads)) gnus-newsgroup-limit)
8781         (incf num))
8782       (pop threads))
8783     (< num 2)))
8784
8785 (defsubst gnus-cut-thread (thread)
8786   "Go forwards in the thread until we find an article that we want to display."
8787   (when (or (eq gnus-fetch-old-headers 'some)
8788             (eq gnus-fetch-old-headers 'invisible)
8789             (numberp gnus-fetch-old-headers)
8790             (eq gnus-build-sparse-threads 'some)
8791             (eq gnus-build-sparse-threads 'more))
8792     ;; Deal with old-fetched headers and sparse threads.
8793     (while (and
8794             thread
8795             (or
8796              (gnus-summary-article-sparse-p (mail-header-number (car thread)))
8797              (gnus-summary-article-ancient-p
8798               (mail-header-number (car thread))))
8799             (if (or (<= (length (cdr thread)) 1)
8800                     (eq gnus-fetch-old-headers 'invisible))
8801                 (setq gnus-newsgroup-limit
8802                       (delq (mail-header-number (car thread))
8803                             gnus-newsgroup-limit)
8804                       thread (cadr thread))
8805               (when (gnus-invisible-cut-children (cdr thread))
8806                 (let ((th (cdr thread)))
8807                   (while th
8808                     (if (memq (mail-header-number (caar th))
8809                               gnus-newsgroup-limit)
8810                         (setq thread (car th)
8811                               th nil)
8812                       (setq th (cdr th))))))))))
8813   thread)
8814
8815 (defun gnus-cut-threads (threads)
8816   "Cut off all uninteresting articles from the beginning of THREADS."
8817   (when (or (eq gnus-fetch-old-headers 'some)
8818             (eq gnus-fetch-old-headers 'invisible)
8819             (numberp gnus-fetch-old-headers)
8820             (eq gnus-build-sparse-threads 'some)
8821             (eq gnus-build-sparse-threads 'more))
8822     (let ((th threads))
8823       (while th
8824         (setcar th (gnus-cut-thread (car th)))
8825         (setq th (cdr th)))))
8826   ;; Remove nixed out threads.
8827   (delq nil threads))
8828
8829 (defun gnus-summary-initial-limit (&optional show-if-empty)
8830   "Figure out what the initial limit is supposed to be on group entry.
8831 This entails weeding out unwanted dormants, low-scored articles,
8832 fetch-old-headers verbiage, and so on."
8833   ;; Most groups have nothing to remove.
8834   (unless (or gnus-inhibit-limiting
8835               (and (null gnus-newsgroup-dormant)
8836                    (eq gnus-newsgroup-display 'gnus-not-ignore)
8837                    (not (eq gnus-fetch-old-headers 'some))
8838                    (not (numberp gnus-fetch-old-headers))
8839                    (not (eq gnus-fetch-old-headers 'invisible))
8840                    (null gnus-summary-expunge-below)
8841                    (not (eq gnus-build-sparse-threads 'some))
8842                    (not (eq gnus-build-sparse-threads 'more))
8843                    (null gnus-thread-expunge-below)))
8844     (push gnus-newsgroup-limit gnus-newsgroup-limits)
8845     (setq gnus-newsgroup-limit nil)
8846     (mapatoms
8847      (lambda (node)
8848        (unless (car (symbol-value node))
8849          ;; These threads have no parents -- they are roots.
8850          (let ((nodes (cdr (symbol-value node)))
8851                thread)
8852            (while nodes
8853              (if (and gnus-thread-expunge-below
8854                       (< (gnus-thread-total-score (car nodes))
8855                          gnus-thread-expunge-below))
8856                  (gnus-expunge-thread (pop nodes))
8857                (setq thread (pop nodes))
8858                (gnus-summary-limit-children thread))))))
8859      gnus-newsgroup-dependencies)
8860     ;; If this limitation resulted in an empty group, we might
8861     ;; pop the previous limit and use it instead.
8862     (when (and (not gnus-newsgroup-limit)
8863                show-if-empty)
8864       (setq gnus-newsgroup-limit (pop gnus-newsgroup-limits)))
8865     gnus-newsgroup-limit))
8866
8867 (defun gnus-summary-limit-children (thread)
8868   "Return 1 if this subthread is visible and 0 if it is not."
8869   ;; First we get the number of visible children to this thread.  This
8870   ;; is done by recursing down the thread using this function, so this
8871   ;; will really go down to a leaf article first, before slowly
8872   ;; working its way up towards the root.
8873   (when thread
8874     (let* ((max-lisp-eval-depth (max 5000 max-lisp-eval-depth))
8875            (children
8876            (if (cdr thread)
8877                (apply '+ (mapcar 'gnus-summary-limit-children
8878                                  (cdr thread)))
8879              0))
8880            (number (mail-header-number (car thread)))
8881            score)
8882       (if (and
8883            (not (memq number gnus-newsgroup-marked))
8884            (or
8885             ;; If this article is dormant and has absolutely no visible
8886             ;; children, then this article isn't visible.
8887             (and (memq number gnus-newsgroup-dormant)
8888                  (zerop children))
8889             ;; If this is "fetch-old-headered" and there is no
8890             ;; visible children, then we don't want this article.
8891             (and (or (eq gnus-fetch-old-headers 'some)
8892                      (numberp gnus-fetch-old-headers))
8893                  (gnus-summary-article-ancient-p number)
8894                  (zerop children))
8895             ;; If this is "fetch-old-headered" and `invisible', then
8896             ;; we don't want this article.
8897             (and (eq gnus-fetch-old-headers 'invisible)
8898                  (gnus-summary-article-ancient-p number))
8899             ;; If this is a sparsely inserted article with no children,
8900             ;; we don't want it.
8901             (and (eq gnus-build-sparse-threads 'some)
8902                  (gnus-summary-article-sparse-p number)
8903                  (zerop children))
8904             ;; If we use expunging, and this article is really
8905             ;; low-scored, then we don't want this article.
8906             (when (and gnus-summary-expunge-below
8907                        (< (setq score
8908                                 (or (cdr (assq number gnus-newsgroup-scored))
8909                                     gnus-summary-default-score))
8910                           gnus-summary-expunge-below))
8911               ;; We increase the expunge-tally here, but that has
8912               ;; nothing to do with the limits, really.
8913               (incf gnus-newsgroup-expunged-tally)
8914               ;; We also mark as read here, if that's wanted.
8915               (when (and gnus-summary-mark-below
8916                          (< score gnus-summary-mark-below))
8917                 (setq gnus-newsgroup-unreads
8918                       (delq number gnus-newsgroup-unreads))
8919                 (if gnus-newsgroup-auto-expire
8920                     (push number gnus-newsgroup-expirable)
8921                   (push (cons number gnus-low-score-mark)
8922                         gnus-newsgroup-reads)))
8923               t)
8924             ;; Do the `display' group parameter.
8925             (and gnus-newsgroup-display
8926                  (let ((gnus-number number))
8927                    (not (funcall gnus-newsgroup-display))))))
8928           ;; Nope, invisible article.
8929           0
8930         ;; Ok, this article is to be visible, so we add it to the limit
8931         ;; and return 1.
8932         (push number gnus-newsgroup-limit)
8933         1))))
8934
8935 (defun gnus-expunge-thread (thread)
8936   "Mark all articles in THREAD as read."
8937   (let* ((number (mail-header-number (car thread))))
8938     (incf gnus-newsgroup-expunged-tally)
8939     ;; We also mark as read here, if that's wanted.
8940     (setq gnus-newsgroup-unreads
8941           (delq number gnus-newsgroup-unreads))
8942     (if gnus-newsgroup-auto-expire
8943         (push number gnus-newsgroup-expirable)
8944       (push (cons number gnus-low-score-mark)
8945             gnus-newsgroup-reads)))
8946   ;; Go recursively through all subthreads.
8947   (mapcar 'gnus-expunge-thread (cdr thread)))
8948
8949 ;; Summary article oriented commands
8950
8951 (defun gnus-summary-refer-parent-article (n)
8952   "Refer parent article N times.
8953 If N is negative, go to ancestor -N instead.
8954 The difference between N and the number of articles fetched is returned."
8955   (interactive "p")
8956   (let ((skip 1)
8957         error header ref)
8958     (when (not (natnump n))
8959       (setq skip (abs n)
8960             n 1))
8961     (while (and (> n 0)
8962                 (not error))
8963       (setq header (gnus-summary-article-header))
8964       (if (and (eq (mail-header-number header)
8965                    (cdr gnus-article-current))
8966                (equal gnus-newsgroup-name
8967                       (car gnus-article-current)))
8968           ;; If we try to find the parent of the currently
8969           ;; displayed article, then we take a look at the actual
8970           ;; References header, since this is slightly more
8971           ;; reliable than the References field we got from the
8972           ;; server.
8973           (with-current-buffer gnus-original-article-buffer
8974             (nnheader-narrow-to-headers)
8975             (unless (setq ref (message-fetch-field "references"))
8976               (when (setq ref (message-fetch-field "in-reply-to"))
8977                 (setq ref (gnus-extract-message-id-from-in-reply-to ref))))
8978             (widen))
8979         (setq ref
8980               ;; It's not the current article, so we take a bet on
8981               ;; the value we got from the server.
8982               (mail-header-references header)))
8983       (if (and ref
8984                (not (equal ref "")))
8985           (unless (gnus-summary-refer-article (gnus-parent-id ref skip))
8986             (gnus-message 1 "Couldn't find parent"))
8987         (gnus-message 1 "No references in article %d"
8988                       (gnus-summary-article-number))
8989         (setq error t))
8990       (decf n))
8991     (gnus-summary-position-point)
8992     n))
8993
8994 (defun gnus-summary-refer-references ()
8995   "Fetch all articles mentioned in the References header.
8996 Return the number of articles fetched."
8997   (interactive)
8998   (let ((ref (mail-header-references (gnus-summary-article-header)))
8999         (current (gnus-summary-article-number))
9000         (n 0))
9001     (if (or (not ref)
9002             (equal ref ""))
9003         (error "No References in the current article")
9004       ;; For each Message-ID in the References header...
9005       (while (string-match "<[^>]*>" ref)
9006         (incf n)
9007         ;; ... fetch that article.
9008         (gnus-summary-refer-article
9009          (prog1 (match-string 0 ref)
9010            (setq ref (substring ref (match-end 0))))))
9011       (gnus-summary-goto-subject current)
9012       (gnus-summary-position-point)
9013       n)))
9014
9015 (defun gnus-delete-duplicate-headers (headers)
9016   ;; First remove leading duplicates.
9017   (while (and (> (length headers) 1)
9018               (= (mail-header-number (car headers))
9019                  (mail-header-number (cadr headers))))
9020     (pop headers))
9021   ;; Then the rest.
9022   (let ((result headers))
9023     (while (> (length headers) 1)
9024       (if (= (mail-header-number (car headers))
9025              (mail-header-number (cadr headers)))
9026           (setcdr headers (cddr headers))
9027         (pop headers)))
9028     result))
9029
9030 (defun gnus-summary-refer-thread (&optional limit)
9031   "Fetch all articles in the current thread. For backends that
9032 know how to search for threads (currently only 'nnimap) a
9033 non-numeric prefix arg will use nnir to search the entire
9034 server; without a prefix arg only the current group is
9035 searched. If the variable `gnus-refer-thread-use-nnir' is
9036 non-nil the prefix arg has the reverse meaning. If no
9037 backend-specific 'request-thread function is available fetch
9038 LIMIT (the numerical prefix) old headers. If LIMIT is
9039 non-numeric or nil fetch the number specified by the
9040 `gnus-refer-thread-limit' variable."
9041   (interactive "P")
9042   (gnus-warp-to-article)
9043   (let* ((header (gnus-summary-article-header))
9044          (id (mail-header-id header))
9045          (gnus-inhibit-demon t)
9046          (gnus-summary-ignore-duplicates t)
9047          (gnus-read-all-available-headers t)
9048          (gnus-refer-thread-use-nnir
9049           (if (and (not (null limit)) (listp limit))
9050               (not gnus-refer-thread-use-nnir) gnus-refer-thread-use-nnir))
9051          (new-headers
9052           (if (gnus-check-backend-function
9053                'request-thread gnus-newsgroup-name)
9054               (gnus-request-thread header gnus-newsgroup-name)
9055             (let* ((limit (if (numberp limit) (prefix-numeric-value limit)
9056                             gnus-refer-thread-limit))
9057                    (last (if (numberp limit)
9058                              (min (+ (mail-header-number header)
9059                                      limit)
9060                                   gnus-newsgroup-highest)
9061                            gnus-newsgroup-highest))
9062                    (subject (gnus-simplify-subject
9063                              (mail-header-subject header)))
9064                    (refs (split-string (or (mail-header-references header)
9065                                            "")))
9066                    (gnus-parse-headers-hook
9067                     `(lambda () (goto-char (point-min))
9068                       (keep-lines
9069                        (regexp-opt ',(append refs (list id subject)))))))
9070               (gnus-fetch-headers (list last) (if (numberp limit)
9071                                                   (* 2 limit) limit) t))))
9072          article-ids new-unreads)
9073     (when (listp new-headers)
9074       (dolist (header new-headers)
9075         (push (mail-header-number header) article-ids))
9076       (setq article-ids (nreverse article-ids))
9077       (setq new-unreads
9078             (gnus-sorted-intersection gnus-newsgroup-unselected article-ids))
9079       (setq gnus-newsgroup-unselected
9080             (gnus-sorted-ndifference gnus-newsgroup-unselected new-unreads))
9081       (setq gnus-newsgroup-unreads
9082             (gnus-sorted-nunion gnus-newsgroup-unreads new-unreads))
9083       (setq gnus-newsgroup-headers
9084             (gnus-delete-duplicate-headers
9085              (gnus-merge
9086               'list gnus-newsgroup-headers new-headers
9087               'gnus-article-sort-by-number)))
9088       (setq gnus-newsgroup-articles
9089             (gnus-sorted-nunion gnus-newsgroup-articles article-ids))
9090       (gnus-summary-limit-include-thread id)))
9091   (gnus-summary-show-thread))
9092
9093 (defun gnus-summary-open-group-with-article (message-id)
9094   "Open a group containing the article with the given MESSAGE-ID."
9095   (interactive "sMessage-ID: ")
9096   (require 'nndoc)
9097   (with-temp-buffer
9098     ;; Prepare a dummy article
9099     (erase-buffer)
9100     (insert "From nobody Tue Sep 13 22:05:34 2011\n\n")
9101
9102     ;; Prepare pretty modelines for summary and article buffers
9103     (let ((gnus-summary-mode-line-format "Found %G")
9104           (gnus-article-mode-line-format
9105            ;; Group names just get in the way here, especially the
9106            ;; abbreviated ones
9107            (if (string-match "%[gG]" gnus-article-mode-line-format)
9108                (concat (substring gnus-article-mode-line-format
9109                                   0 (match-beginning 0))
9110                        (substring gnus-article-mode-line-format (match-end 0)))
9111              gnus-article-mode-line-format)))
9112
9113       ;; Build an ephemeral group containing the dummy article (hidden)
9114       (gnus-group-read-ephemeral-group
9115        message-id
9116        `(nndoc ,message-id
9117                (nndoc-address ,(current-buffer))
9118                (nndoc-article-type mbox))
9119        :activate
9120        (cons (current-buffer) gnus-current-window-configuration)
9121        (not :request-only)
9122        '(-1)                            ; :select-articles
9123        (not :parameters)
9124        0))                              ; :number
9125     ;; Fetch the desired article
9126     (gnus-summary-refer-article message-id)))
9127
9128 (defun gnus-summary-refer-article (message-id)
9129   "Fetch an article specified by MESSAGE-ID."
9130   (interactive "sMessage-ID: ")
9131   (gnus-warp-to-article)
9132   (when (and (stringp message-id)
9133              (not (zerop (length message-id))))
9134     (setq message-id (gnus-replace-in-string message-id " " ""))
9135     ;; Construct the correct Message-ID if necessary.
9136     ;; Suggested by tale@pawl.rpi.edu.
9137     (unless (string-match "^<" message-id)
9138       (setq message-id (concat "<" message-id)))
9139     (unless (string-match ">$" message-id)
9140       (setq message-id (concat message-id ">")))
9141     ;; People often post MIDs from URLs, so unhex it:
9142     (unless (string-match "@" message-id)
9143       (setq message-id (gnus-url-unhex-string message-id)))
9144     (let* ((header (gnus-id-to-header message-id))
9145            (sparse (and header
9146                         (gnus-summary-article-sparse-p
9147                          (mail-header-number header))
9148                         (memq (mail-header-number header)
9149                               gnus-newsgroup-limit)))
9150            number)
9151       (cond
9152        ;; If the article is present in the buffer we just go to it.
9153        ((and header
9154              (or (not (gnus-summary-article-sparse-p
9155                        (mail-header-number header)))
9156                  sparse))
9157         (prog1
9158             (gnus-summary-goto-article
9159              (mail-header-number header) nil t)
9160           (when sparse
9161             (gnus-summary-update-article (mail-header-number header)))))
9162        (t
9163         ;; We fetch the article.
9164         (catch 'found
9165           (dolist (gnus-override-method (gnus-refer-article-methods))
9166             (when (and (gnus-check-server gnus-override-method)
9167                        ;; Fetch the header,
9168                        (setq number (gnus-summary-insert-subject message-id)))
9169               ;; and display the article.
9170               (gnus-summary-select-article nil nil nil number)
9171               (throw 'found t)))
9172           (gnus-message 3 "Couldn't fetch article %s" message-id)))))))
9173
9174 (defun gnus-refer-article-methods ()
9175   "Return a list of referable methods."
9176   (cond
9177    ;; No method, so we default to current and native.
9178    ((null gnus-refer-article-method)
9179     (list gnus-current-select-method gnus-select-method))
9180    ;; Current.
9181    ((eq 'current gnus-refer-article-method)
9182     (list gnus-current-select-method))
9183    ;; List of select methods.
9184    ((not (and (symbolp (car gnus-refer-article-method))
9185               (assq (car gnus-refer-article-method) nnoo-definition-alist)))
9186     (let (out)
9187       (dolist (method gnus-refer-article-method)
9188         (push (if (eq 'current method)
9189                   gnus-current-select-method
9190                 (if (eq 'nnir (car method))
9191                     (list
9192                      'nnir
9193                      (or (cadr method)
9194                          (gnus-method-to-server gnus-current-select-method)))
9195                   method))
9196               out))
9197       (nreverse out)))
9198    ;; One single select method.
9199    (t
9200     (list gnus-refer-article-method))))
9201
9202 (defun gnus-summary-edit-parameters ()
9203   "Edit the group parameters of the current group."
9204   (interactive)
9205   (gnus-group-edit-group gnus-newsgroup-name 'params))
9206
9207 (defun gnus-summary-customize-parameters ()
9208   "Customize the group parameters of the current group."
9209   (interactive)
9210   (gnus-group-customize gnus-newsgroup-name))
9211
9212 (defun gnus-summary-enter-digest-group (&optional force)
9213   "Enter an nndoc group based on the current article.
9214 If FORCE, force a digest interpretation.  If not, try to guess
9215 what the document format is.
9216
9217 To control what happens when you exit the group, see the
9218 `gnus-auto-select-on-ephemeral-exit' variable."
9219   (interactive "P")
9220   (let ((conf gnus-current-window-configuration))
9221     (save-window-excursion
9222       (save-excursion
9223         (let (gnus-article-prepare-hook
9224               gnus-display-mime-function
9225               gnus-break-pages)
9226           (gnus-summary-select-article))))
9227     (setq gnus-current-window-configuration conf)
9228     (let* ((name (format "%s-%d"
9229                          (gnus-group-prefixed-name
9230                           gnus-newsgroup-name (list 'nndoc ""))
9231                          (with-current-buffer gnus-summary-buffer
9232                            gnus-current-article)))
9233            (ogroup gnus-newsgroup-name)
9234            (params (append (gnus-info-params (gnus-get-info ogroup))
9235                            (list (cons 'to-group ogroup))
9236                            (list (cons 'parent-group ogroup))
9237                            (list (cons 'save-article-group ogroup))))
9238            (case-fold-search t)
9239            (buf (current-buffer))
9240            dig to-address charset)
9241       (with-current-buffer gnus-original-article-buffer
9242         ;; Have the digest group inherit the main mail address of
9243         ;; the parent article.
9244         (when (setq to-address (or (gnus-fetch-field "reply-to")
9245                                    (gnus-fetch-field "from")))
9246           (setq params
9247                 (append
9248                  params
9249                  (list (cons 'to-address
9250                              (funcall gnus-decode-encoded-address-function
9251                                       to-address))))))
9252         (setq dig (nnheader-set-temp-buffer " *gnus digest buffer*"))
9253         (insert-buffer-substring gnus-original-article-buffer)
9254         (narrow-to-region
9255          (goto-char (point-min))
9256          (or (search-forward "\n\n" nil t) (point)))
9257         ;; Remove lines that may lead nndoc to misinterpret the
9258         ;; document type.
9259         (goto-char (point-min))
9260         (delete-matching-lines "^Path:\\|^From ")
9261         ;; Parse charset, and decode content transfer encoding.
9262         (setq charset (mail-content-type-get
9263                        (mail-header-parse-content-type
9264                         (or (gnus-fetch-field "content-type") ""))
9265                        'charset))
9266         (let ((encoding (gnus-fetch-field "content-transfer-encoding")))
9267           (when encoding
9268             (message-remove-header "content-transfer-encoding")
9269             (goto-char (point-max))
9270             (widen)
9271             (narrow-to-region (point) (point-max))
9272             (mm-decode-content-transfer-encoding
9273              (intern (downcase (mail-header-strip encoding))))))
9274         (widen))
9275       (unwind-protect
9276           (if (let ((gnus-newsgroup-ephemeral-charset
9277                      (if charset
9278                          (intern (downcase (gnus-strip-whitespace charset)))
9279                        gnus-newsgroup-charset))
9280                     (gnus-newsgroup-ephemeral-ignored-charsets
9281                      gnus-newsgroup-ignored-charsets))
9282                 (gnus-group-read-ephemeral-group
9283                  name `(nndoc ,name (nndoc-address ,(get-buffer dig))
9284                               (nndoc-article-type
9285                                ,(if force 'mbox 'guess)))
9286                  t nil nil nil
9287                  `((adapt-file . ,(gnus-score-file-name gnus-newsgroup-name
9288                                                         "ADAPT")))))
9289               ;; Make all postings to this group go to the parent group.
9290               (nconc (gnus-info-params (gnus-get-info name))
9291                      params)
9292             ;; Couldn't select this doc group.
9293             (switch-to-buffer buf)
9294             (gnus-set-global-variables)
9295             (gnus-configure-windows 'summary)
9296             (gnus-message 3 "Article couldn't be entered?"))
9297         (kill-buffer dig)))))
9298
9299 (defun gnus-summary-read-document (n)
9300   "Open a new group based on the current article(s).
9301 This will allow you to read digests and other similar
9302 documents as newsgroups.
9303 Obeys the standard process/prefix convention."
9304   (interactive "P")
9305   (let* ((ogroup gnus-newsgroup-name)
9306          (params (append (gnus-info-params (gnus-get-info ogroup))
9307                          (list (cons 'to-group ogroup))))
9308          group egroup groups vgroup)
9309     (dolist (article (gnus-summary-work-articles n))
9310       (setq group (format "%s-%d" gnus-newsgroup-name article))
9311       (gnus-summary-remove-process-mark article)
9312       (when (gnus-summary-display-article article)
9313         (save-excursion ;;What for?
9314           (with-temp-buffer
9315             (insert-buffer-substring gnus-original-article-buffer)
9316             ;; Remove some headers that may lead nndoc to make
9317             ;; the wrong guess.
9318             (message-narrow-to-head)
9319             (goto-char (point-min))
9320             (delete-matching-lines "^Path:\\|^From ")
9321             (widen)
9322             (if (setq egroup
9323                       (gnus-group-read-ephemeral-group
9324                        group `(nndoc ,group (nndoc-address ,(current-buffer))
9325                                      (nndoc-article-type guess))
9326                        t nil t))
9327                 (progn
9328                   ;; Make all postings to this group go to the parent group.
9329                   (nconc (gnus-info-params (gnus-get-info egroup))
9330                          params)
9331                   (push egroup groups))
9332               ;; Couldn't select this doc group.
9333               (gnus-error 3 "Article couldn't be entered"))))))
9334     ;; Now we have selected all the documents.
9335     (cond
9336      ((not groups)
9337       (error "None of the articles could be interpreted as documents"))
9338      ((gnus-group-read-ephemeral-group
9339        (setq vgroup (format
9340                      "nnvirtual:%s-%s" gnus-newsgroup-name
9341                      (format-time-string "%Y%m%dT%H%M%S")))
9342        `(nnvirtual ,vgroup (nnvirtual-component-groups ,groups))
9343        t
9344        (cons (current-buffer) 'summary)))
9345      (t
9346       (error "Couldn't select virtual nndoc group")))))
9347
9348 (defun gnus-summary-widget-forward (arg)
9349   "Move point to the next field or button in the article.
9350 With optional ARG, move across that many fields."
9351   (interactive "p")
9352   (gnus-summary-select-article)
9353   (gnus-configure-windows 'article)
9354   (select-window (gnus-get-buffer-window gnus-article-buffer))
9355   (widget-forward arg))
9356
9357 (defun gnus-summary-widget-backward (arg)
9358   "Move point to the previous field or button in the article.
9359 With optional ARG, move across that many fields."
9360   (interactive "p")
9361   (gnus-summary-select-article)
9362   (gnus-configure-windows 'article)
9363   (select-window (gnus-get-buffer-window gnus-article-buffer))
9364   (unless (widget-at (point))
9365     (goto-char (point-max)))
9366   (widget-backward arg))
9367
9368 (defun gnus-summary-isearch-article (&optional regexp-p)
9369   "Do incremental search forward on the current article.
9370 If REGEXP-P (the prefix) is non-nil, do regexp isearch."
9371   (interactive "P")
9372   (gnus-summary-select-article)
9373   (gnus-configure-windows 'article)
9374   (gnus-eval-in-buffer-window gnus-article-buffer
9375     (save-restriction
9376       (widen)
9377       (isearch-forward regexp-p))))
9378
9379 (defun gnus-summary-repeat-search-article-forward ()
9380   "Repeat the previous search forwards."
9381   (interactive)
9382   (unless gnus-last-search-regexp
9383     (error "No previous search"))
9384   (gnus-summary-search-article-forward gnus-last-search-regexp))
9385
9386 (defun gnus-summary-repeat-search-article-backward ()
9387   "Repeat the previous search backwards."
9388   (interactive)
9389   (unless gnus-last-search-regexp
9390     (error "No previous search"))
9391   (gnus-summary-search-article-forward gnus-last-search-regexp t))
9392
9393 (defun gnus-summary-search-article-forward (regexp &optional backward)
9394   "Search for an article containing REGEXP forward.
9395 If BACKWARD, search backward instead."
9396   (interactive
9397    (list (read-string
9398           (format "Search article %s (regexp%s): "
9399                   (if current-prefix-arg "backward" "forward")
9400                   (if gnus-last-search-regexp
9401                       (concat ", default " gnus-last-search-regexp)
9402                     "")))
9403          current-prefix-arg))
9404   (if (string-equal regexp "")
9405       (setq regexp (or gnus-last-search-regexp ""))
9406     (setq gnus-last-search-regexp regexp)
9407     (setq gnus-article-before-search gnus-current-article))
9408   ;; Intentionally set gnus-last-article.
9409   (setq gnus-last-article gnus-article-before-search)
9410   (let ((gnus-last-article gnus-last-article))
9411     (if (gnus-summary-search-article regexp backward)
9412         (gnus-summary-show-thread)
9413       (signal 'search-failed (list regexp)))))
9414
9415 (defun gnus-summary-search-article-backward (regexp)
9416   "Search for an article containing REGEXP backward."
9417   (interactive
9418    (list (read-string
9419           (format "Search article backward (regexp%s): "
9420                   (if gnus-last-search-regexp
9421                       (concat ", default " gnus-last-search-regexp)
9422                     "")))))
9423   (gnus-summary-search-article-forward regexp 'backward))
9424
9425 (defun gnus-summary-search-article (regexp &optional backward)
9426   "Search for an article containing REGEXP.
9427 Optional argument BACKWARD means do search for backward.
9428 `gnus-select-article-hook' is not called during the search."
9429   ;; We have to require this here to make sure that the following
9430   ;; dynamic binding isn't shadowed by autoloading.
9431   (require 'gnus-async)
9432   (require 'gnus-art)
9433   (let ((gnus-select-article-hook nil)  ;Disable hook.
9434         (gnus-article-prepare-hook nil)
9435         (gnus-mark-article-hook nil)    ;Inhibit marking as read.
9436         (gnus-use-article-prefetch nil)
9437         (gnus-xmas-force-redisplay nil) ;Inhibit XEmacs redisplay.
9438         (gnus-use-trees nil)            ;Inhibit updating tree buffer.
9439         (gnus-visual nil)
9440         (gnus-keep-backlog nil)
9441         (gnus-break-pages nil)
9442         (gnus-summary-display-arrow nil)
9443         (gnus-updated-mode-lines nil)
9444         (gnus-auto-center-summary nil)
9445         (sum (current-buffer))
9446         (gnus-display-mime-function nil)
9447         (found nil)
9448         point)
9449     (gnus-save-hidden-threads
9450       (gnus-summary-select-article)
9451       (set-buffer gnus-article-buffer)
9452       (goto-char (window-point (get-buffer-window (current-buffer))))
9453       (when backward
9454         (forward-line -1))
9455       (while (not found)
9456         (gnus-message 7 "Searching article: %d..." (cdr gnus-article-current))
9457         (if (if backward
9458                 (re-search-backward regexp nil t)
9459               (re-search-forward regexp nil t))
9460             ;; We found the regexp.
9461             (progn
9462               (setq found 'found)
9463               (beginning-of-line)
9464               (set-window-start
9465                (get-buffer-window (current-buffer))
9466                (point))
9467               (forward-line 1)
9468               (set-window-point
9469                (get-buffer-window (current-buffer))
9470                (point))
9471               (set-buffer sum)
9472               (setq point (point)))
9473           ;; We didn't find it, so we go to the next article.
9474           (set-buffer sum)
9475           (setq found 'not)
9476           (while (eq found 'not)
9477             (if (not (if backward (gnus-summary-find-prev)
9478                        (gnus-summary-find-next)))
9479                 ;; No more articles.
9480                 (setq found t)
9481               ;; Select the next article and adjust point.
9482               (unless (gnus-summary-article-sparse-p
9483                        (gnus-summary-article-number))
9484                 (setq found nil)
9485                 (gnus-summary-select-article)
9486                 (set-buffer gnus-article-buffer)
9487                 (widen)
9488                 (goto-char (if backward (point-max) (point-min))))))))
9489       (gnus-message 7 ""))
9490     ;; Return whether we found the regexp.
9491     (when (eq found 'found)
9492       (goto-char point)
9493       (sit-for 0) ;; Ensure that the point is visible in the summary window.
9494       (gnus-summary-show-thread)
9495       (gnus-summary-goto-subject gnus-current-article)
9496       (gnus-summary-position-point)
9497       t)))
9498
9499 (defun gnus-find-matching-articles (header regexp)
9500   "Return a list of all articles that match REGEXP on HEADER.
9501 This search includes all articles in the current group that Gnus has
9502 fetched headers for, whether they are displayed or not."
9503   (let ((articles nil)
9504         ;; Can't eta-reduce because it's a macro.
9505         (func `(lambda (h) (,(intern (concat "mail-header-" header)) h)))
9506         (case-fold-search t))
9507     (dolist (header gnus-newsgroup-headers)
9508       (when (string-match regexp (funcall func header))
9509         (push (mail-header-number header) articles)))
9510     (nreverse articles)))
9511
9512 (defun gnus-summary-find-matching (header regexp &optional backward unread
9513                                           not-case-fold not-matching)
9514   "Return a list of all articles that match REGEXP on HEADER.
9515 The search stars on the current article and goes forwards unless
9516 BACKWARD is non-nil.  If BACKWARD is `all', do all articles.
9517 If UNREAD is non-nil, only unread articles will
9518 be taken into consideration.  If NOT-CASE-FOLD, case won't be folded
9519 in the comparisons. If NOT-MATCHING, return a list of all articles that
9520 not match REGEXP on HEADER."
9521   (let ((case-fold-search (not not-case-fold))
9522         articles d func)
9523     (if (consp header)
9524         (if (eq (car header) 'extra)
9525             (setq func
9526                   `(lambda (h)
9527                      (or (cdr (assq ',(cdr header) (mail-header-extra h)))
9528                          "")))
9529           (error "%s is an invalid header" header))
9530       (unless (fboundp (intern (concat "mail-header-" header)))
9531         (error "%s is not a valid header" header))
9532       (setq func `(lambda (h) (,(intern (concat "mail-header-" header)) h))))
9533     (dolist (d (if (eq backward 'all)
9534                    gnus-newsgroup-data
9535                  (gnus-data-find-list
9536                   (gnus-summary-article-number)
9537                   (gnus-data-list backward))))
9538       (when (and (or (not unread)       ; We want all articles...
9539                      (gnus-data-unread-p d)) ; Or just unreads.
9540                  (vectorp (gnus-data-header d)) ; It's not a pseudo.
9541                  (if not-matching
9542                      (not (string-match
9543                            regexp
9544                            (funcall func (gnus-data-header d))))
9545                    (string-match regexp
9546                                  (funcall func (gnus-data-header d)))))
9547         (push (gnus-data-number d) articles))) ; Success!
9548     (nreverse articles)))
9549
9550 (defun gnus-summary-execute-command (header regexp command &optional backward)
9551   "Search forward for an article whose HEADER matches REGEXP and execute COMMAND.
9552 If HEADER is an empty string (or nil), the match is done on the entire
9553 article.  If BACKWARD (the prefix) is non-nil, search backward instead."
9554   (interactive
9555    (list (let ((completion-ignore-case t))
9556            (gnus-completing-read
9557             "Header name"
9558             (mapcar 'symbol-name
9559                     (append
9560                      '(Number Subject From Lines Date
9561                        Message-ID Xref References Body)
9562                      gnus-extra-headers))
9563             'require-match))
9564          (read-string "Regexp: ")
9565          (read-key-sequence "Command: ")
9566          current-prefix-arg))
9567   (when (equal header "Body")
9568     (setq header ""))
9569   ;; Hidden thread subtrees must be searched as well.
9570   (gnus-summary-show-all-threads)
9571   ;; We don't want to change current point nor window configuration.
9572   (save-excursion
9573     (save-window-excursion
9574       (let (gnus-visual
9575             gnus-treat-strip-trailing-blank-lines
9576             gnus-treat-strip-leading-blank-lines
9577             gnus-treat-strip-multiple-blank-lines
9578             gnus-treat-hide-boring-headers
9579             gnus-treat-fold-newsgroups
9580             gnus-article-prepare-hook)
9581         (gnus-message 6 "Executing %s..." (key-description command))
9582         ;; We'd like to execute COMMAND interactively so as to give arguments.
9583         (gnus-execute header regexp
9584                       `(call-interactively ',(key-binding command))
9585                       backward)
9586         (gnus-message 6 "Executing %s...done" (key-description command))))))
9587
9588 (defun gnus-summary-beginning-of-article ()
9589   "Scroll the article back to the beginning."
9590   (interactive)
9591   (gnus-summary-select-article)
9592   (gnus-configure-windows 'article)
9593   (gnus-eval-in-buffer-window gnus-article-buffer
9594     (widen)
9595     (goto-char (point-min))
9596     (when gnus-break-pages
9597       (gnus-narrow-to-page))))
9598
9599 (defun gnus-summary-end-of-article ()
9600   "Scroll to the end of the article."
9601   (interactive)
9602   (gnus-summary-select-article)
9603   (gnus-configure-windows 'article)
9604   (gnus-eval-in-buffer-window gnus-article-buffer
9605     (widen)
9606     (goto-char (point-max))
9607     (recenter -3)
9608     (when gnus-break-pages
9609       (gnus-narrow-to-page))))
9610
9611 (defun gnus-summary-print-truncate-and-quote (string &optional len)
9612   "Truncate to LEN and quote all \"(\"'s in STRING."
9613   (gnus-replace-in-string (if (and len (> (length string) len))
9614                               (substring string 0 len)
9615                             string)
9616                           "[()]" "\\\\\\&"))
9617
9618 (defun gnus-summary-print-article (&optional filename n)
9619   "Generate and print a PostScript image of the process-marked (mail) articles.
9620
9621 If used interactively, print the current article if none are
9622 process-marked.  With prefix arg, prompt the user for the name of the
9623 file to save in.
9624
9625 When used from Lisp, accept two optional args FILENAME and N.  N means
9626 to print the next N articles.  If N is negative, print the N previous
9627 articles.  If N is nil and articles have been marked with the process
9628 mark, print these instead.
9629
9630 If the optional first argument FILENAME is nil, send the image to the
9631 printer.  If FILENAME is a string, save the PostScript image in a file with
9632 that name.  If FILENAME is a number, prompt the user for the name of the file
9633 to save in."
9634   (interactive (list (ps-print-preprint current-prefix-arg)))
9635   (dolist (article (gnus-summary-work-articles n))
9636     (gnus-summary-select-article nil nil 'pseudo article)
9637     (gnus-eval-in-buffer-window gnus-article-buffer
9638       (gnus-print-buffer))
9639     (gnus-summary-remove-process-mark article))
9640   (ps-despool filename))
9641
9642 (defun gnus-print-buffer ()
9643   (let ((ps-left-header
9644          (list
9645           (concat "("
9646                   (gnus-summary-print-truncate-and-quote
9647                    (mail-header-subject gnus-current-headers)
9648                    66) ")")
9649           (concat "("
9650                   (gnus-summary-print-truncate-and-quote
9651                    (mail-header-from gnus-current-headers)
9652                    45) ")")))
9653         (ps-right-header
9654          (list
9655           "/pagenumberstring load"
9656           (concat "("
9657                   (mail-header-date gnus-current-headers) ")"))))
9658     (gnus-run-hooks 'gnus-ps-print-hook)
9659     (save-excursion
9660       (if ps-print-color-p
9661           (ps-spool-buffer-with-faces)
9662         (ps-spool-buffer)))))
9663
9664 (declare-function gnus-flush-original-article-buffer "gnus-art" ())
9665
9666 (defun gnus-summary-show-complete-article ()
9667   "Show a complete version of the current article.
9668 This is only useful if you're looking at a partial version of the
9669 article currently."
9670   (interactive)
9671   (let ((gnus-keep-backlog nil)
9672         (gnus-use-cache nil)
9673         (gnus-agent nil)
9674         (variable (intern
9675                    (format "%s-fetch-partial-articles"
9676                            (car (gnus-find-method-for-group
9677                                  gnus-newsgroup-name)))
9678                    obarray))
9679         old-val)
9680     (unwind-protect
9681         (progn
9682           (setq old-val (symbol-value variable))
9683           (set variable nil)
9684           (gnus-flush-original-article-buffer)
9685           (gnus-summary-show-article))
9686       (set variable old-val))))
9687
9688 (defun gnus-summary-show-article (&optional arg)
9689   "Force redisplaying of the current article.
9690 If ARG (the prefix) is a number, show the article with the charset
9691 defined in `gnus-summary-show-article-charset-alist', or the charset
9692 input.
9693 If ARG (the prefix) is non-nil and not a number, show the article,
9694 but without running any of the article treatment functions
9695 article.  Normally, the keystroke is `C-u g'.  When using `C-u
9696 C-u g', show the raw article."
9697   (interactive "P")
9698   (cond
9699    ((numberp arg)
9700     (gnus-summary-show-article t)
9701     (let ((gnus-newsgroup-charset
9702            (or (cdr (assq arg gnus-summary-show-article-charset-alist))
9703                (mm-read-coding-system
9704                 "View as charset: " ;; actually it is coding system.
9705                 (with-current-buffer gnus-article-buffer
9706                   (mm-detect-coding-region (point) (point-max))))))
9707           (gnus-newsgroup-ignored-charsets 'gnus-all))
9708       (gnus-summary-select-article nil 'force)
9709       (let ((deps gnus-newsgroup-dependencies)
9710             head header lines)
9711         (with-current-buffer gnus-original-article-buffer
9712           (save-restriction
9713             (message-narrow-to-head)
9714             (setq head (buffer-string))
9715             (goto-char (point-min))
9716             (unless (re-search-forward "^lines:[ \t]\\([0-9]+\\)" nil t)
9717               (goto-char (point-max))
9718               (widen)
9719               (setq lines (1- (count-lines (point) (point-max))))))
9720           (with-temp-buffer
9721             (insert (format "211 %d Article retrieved.\n"
9722                             (cdr gnus-article-current)))
9723             (insert head)
9724             (if lines (insert (format "Lines: %d\n" lines)))
9725             (insert ".\n")
9726             (let ((nntp-server-buffer (current-buffer)))
9727               (setq header (car (gnus-get-newsgroup-headers deps t))))))
9728         (gnus-data-set-header
9729          (gnus-data-find (cdr gnus-article-current))
9730          header)
9731         (gnus-summary-update-article-line
9732          (cdr gnus-article-current) header)
9733         (when (gnus-summary-goto-subject (cdr gnus-article-current) nil t)
9734           (gnus-summary-update-secondary-mark (cdr gnus-article-current))))))
9735    ((not arg)
9736     ;; Select the article the normal way.
9737     (if (eq mm-text-html-renderer 'shr)
9738         (progn
9739           (require 'shr)
9740           (let ((shr-ignore-cache t))
9741             (gnus-summary-select-article nil 'force)))
9742       (gnus-summary-select-article nil 'force)))
9743    ((equal arg '(16))
9744     ;; C-u C-u g
9745     (let ((gnus-inhibit-article-treatments t))
9746       (gnus-summary-select-article nil 'force)))
9747    (t
9748     ;; We have to require this here to make sure that the following
9749     ;; dynamic binding isn't shadowed by autoloading.
9750     (require 'gnus-async)
9751     (require 'gnus-art)
9752     ;; Bind the article treatment functions to nil.
9753     (let ((gnus-have-all-headers t)
9754           gnus-article-prepare-hook
9755           gnus-article-decode-hook
9756           gnus-display-mime-function
9757           gnus-break-pages)
9758       ;; Destroy any MIME parts.
9759       (when (gnus-buffer-live-p gnus-article-buffer)
9760         (with-current-buffer gnus-article-buffer
9761           (gnus-article-stop-animations)
9762           (gnus-stop-downloads)
9763           (mm-destroy-parts gnus-article-mime-handles)
9764           ;; Set it to nil for safety reason.
9765           (setq gnus-article-mime-handle-alist nil)
9766           (setq gnus-article-mime-handles nil)))
9767       (gnus-summary-select-article nil 'force))))
9768   (gnus-summary-goto-subject gnus-current-article)
9769   (gnus-summary-position-point))
9770
9771 (defun gnus-summary-show-raw-article ()
9772   "Show the raw article without any article massaging functions being run."
9773   (interactive)
9774   (gnus-summary-show-article t))
9775
9776 (defun gnus-summary-verbose-headers (&optional arg)
9777   "Toggle permanent full header display.
9778 If ARG is a positive number, turn header display on.
9779 If ARG is a negative number, turn header display off."
9780   (interactive "P")
9781   (setq gnus-show-all-headers
9782         (cond ((or (not (numberp arg))
9783                    (zerop arg))
9784                (not gnus-show-all-headers))
9785               ((natnump arg)
9786                t)))
9787   (gnus-summary-show-article))
9788
9789 (declare-function article-narrow-to-head "gnus-art" ())
9790 (declare-function gnus-article-hidden-text-p "gnus-art" (type))
9791 (declare-function gnus-delete-wash-type "gnus-art" (type))
9792 (declare-function gnus-mime-buttonize-attachments-in-header
9793                   "gnus-art" (&optional interactive))
9794
9795 (defun gnus-summary-toggle-header (&optional arg)
9796   "Show the headers if they are hidden, or hide them if they are shown.
9797 If ARG is a positive number, show the entire header.
9798 If ARG is a negative number, hide the unwanted header lines."
9799   (interactive "P")
9800   (let ((window (and (gnus-buffer-live-p gnus-article-buffer)
9801                      (get-buffer-window gnus-article-buffer t))))
9802     (with-current-buffer gnus-article-buffer
9803       (widen)
9804       (article-narrow-to-head)
9805       (let* ((inhibit-read-only t)
9806              (inhibit-point-motion-hooks t)
9807              (hidden (if (numberp arg)
9808                          (>= arg 0)
9809                        (or (not (looking-at "[^ \t\n]+:"))
9810                            (gnus-article-hidden-text-p 'headers))))
9811              s e)
9812         (delete-region (point-min) (point-max))
9813         (with-current-buffer gnus-original-article-buffer
9814           (goto-char (setq s (point-min)))
9815           (setq e (if (search-forward "\n\n" nil t)
9816                       (1- (point))
9817                     (point-max))))
9818         (insert-buffer-substring gnus-original-article-buffer s e)
9819         (run-hooks 'gnus-article-decode-hook)
9820         (if hidden
9821             (let ((gnus-treat-hide-headers nil)
9822                   (gnus-treat-hide-boring-headers nil))
9823               (gnus-delete-wash-type 'headers)
9824               (gnus-treat-article 'head))
9825           (gnus-treat-article 'head)
9826           ;; Add attachment buttons to the header.
9827           (when gnus-mime-display-attachment-buttons-in-header
9828             (gnus-mime-buttonize-attachments-in-header)))
9829         (widen)
9830         (if window
9831             (set-window-start window (goto-char (point-min))))
9832         (if gnus-break-pages
9833             (gnus-narrow-to-page)
9834           (when (gnus-visual-p 'page-marker)
9835             (let ((inhibit-read-only t))
9836               (gnus-remove-text-with-property 'gnus-prev)
9837               (gnus-remove-text-with-property 'gnus-next))))
9838         (gnus-set-mode-line 'article)))))
9839
9840 (defun gnus-summary-show-all-headers ()
9841   "Make all header lines visible."
9842   (interactive)
9843   (gnus-summary-toggle-header 1))
9844
9845 (defun gnus-summary-caesar-message (&optional arg)
9846   "Caesar rotate the current article by 13.
9847 With a non-numerical prefix, also rotate headers.  A numerical
9848 prefix specifies how many places to rotate each letter forward."
9849   (interactive "P")
9850   (gnus-summary-select-article)
9851   (let ((mail-header-separator ""))
9852     (gnus-eval-in-buffer-window gnus-article-buffer
9853       (save-restriction
9854         (widen)
9855         (let ((start (window-start))
9856               (inhibit-read-only t))
9857           (if (equal arg '(4))
9858               (message-caesar-buffer-body nil t)
9859             (message-caesar-buffer-body arg))
9860           (set-window-start (get-buffer-window (current-buffer)) start)))))
9861   ;; Create buttons and stuff...
9862   (gnus-treat-article nil))
9863
9864 (declare-function idna-to-unicode "ext:idna" (str))
9865
9866 (defun gnus-summary-idna-message (&optional arg)
9867   "Decode IDNA encoded domain names in the current articles.
9868 IDNA encoded domain names looks like `xn--bar'.  If a string
9869 remain unencoded after running this function, it is likely an
9870 invalid IDNA string (`xn--bar' is invalid).
9871
9872 You must have GNU Libidn (URL `http://www.gnu.org/software/libidn/')
9873 installed for this command to work."
9874   (interactive "P")
9875   (if (not (and (mm-coding-system-p 'utf-8)
9876                 (condition-case nil
9877                     (require 'idna)
9878                   (file-error)
9879                   (invalid-operation))
9880                 (symbol-value 'idna-program)
9881                 (executable-find (symbol-value 'idna-program))))
9882       (gnus-message
9883        5 "GNU Libidn not installed properly (`idn' or `idna.el' missing)")
9884     (gnus-summary-select-article)
9885     (let ((mail-header-separator ""))
9886       (gnus-eval-in-buffer-window gnus-article-buffer
9887         (save-restriction
9888           (widen)
9889           (let ((start (window-start))
9890                 buffer-read-only)
9891             (while (re-search-forward "\\(xn--[-0-9a-z]+\\)" nil t)
9892               (replace-match (idna-to-unicode (match-string 1))))
9893             (set-window-start (get-buffer-window (current-buffer)) start)))))))
9894
9895 (defun gnus-summary-morse-message (&optional arg)
9896   "Morse decode the current article."
9897   (interactive "P")
9898   (gnus-summary-select-article)
9899   (let ((mail-header-separator ""))
9900     (gnus-eval-in-buffer-window gnus-article-buffer
9901       (save-excursion
9902         (save-restriction
9903           (widen)
9904           (let ((pos (window-start))
9905                 (inhibit-read-only t))
9906             (goto-char (point-min))
9907             (when (message-goto-body)
9908               (gnus-narrow-to-body))
9909             (goto-char (point-min))
9910             (while (search-forward "·" (point-max) t)
9911               (replace-match "."))
9912             (unmorse-region (point-min) (point-max))
9913             (widen)
9914             (set-window-start (get-buffer-window (current-buffer)) pos)))))))
9915
9916 (defun gnus-summary-stop-page-breaking ()
9917   "Stop page breaking in the current article."
9918   (interactive)
9919   (gnus-summary-select-article)
9920   (gnus-eval-in-buffer-window gnus-article-buffer
9921     (widen)
9922     (when (gnus-visual-p 'page-marker)
9923       (let ((inhibit-read-only t))
9924         (gnus-remove-text-with-property 'gnus-prev)
9925         (gnus-remove-text-with-property 'gnus-next))
9926       (setq gnus-page-broken nil))))
9927
9928 (defun gnus-summary-move-article (&optional n to-newsgroup
9929                                             select-method action)
9930   "Move the current article to a different newsgroup.
9931 If N is a positive number, move the N next articles.
9932 If N is a negative number, move the N previous articles.
9933 If N is nil and any articles have been marked with the process mark,
9934 move those articles instead.
9935 If TO-NEWSGROUP is string, do not prompt for a newsgroup to move to.
9936 If SELECT-METHOD is non-nil, do not move to a specific newsgroup, but
9937 re-spool using this method.
9938
9939 When called interactively with TO-NEWSGROUP being nil, the value of
9940 the variable `gnus-move-split-methods' is used for finding a default
9941 for the target newsgroup.
9942
9943 For this function to work, both the current newsgroup and the
9944 newsgroup that you want to move to have to support the `request-move'
9945 and `request-accept' functions.
9946
9947 ACTION can be either `move' (the default), `crosspost' or `copy'."
9948   (interactive "P")
9949   (unless action
9950     (setq action 'move))
9951   ;; Check whether the source group supports the required functions.
9952   (cond ((and (eq action 'move)
9953               (not (gnus-check-backend-function
9954                     'request-move-article gnus-newsgroup-name)))
9955          (error "The current group does not support article moving"))
9956         ((and (eq action 'crosspost)
9957               (not (gnus-check-backend-function
9958                     'request-replace-article gnus-newsgroup-name)))
9959          (error "The current group does not support article editing")))
9960   (let ((articles (gnus-summary-work-articles n))
9961         (prefix (if (gnus-check-backend-function
9962                      'request-move-article gnus-newsgroup-name)
9963                     (funcall gnus-move-group-prefix-function
9964                              gnus-newsgroup-name)
9965                   ""))
9966         (names '((move "Move" "Moving")
9967                  (copy "Copy" "Copying")
9968                  (crosspost "Crosspost" "Crossposting")))
9969         (copy-buf (save-excursion
9970                     (nnheader-set-temp-buffer " *copy article*")))
9971         art-group to-method new-xref article to-groups
9972         articles-to-update-marks encoded)
9973     (unless (assq action names)
9974       (error "Unknown action %s" action))
9975     ;; Read the newsgroup name.
9976     (when (and (not to-newsgroup)
9977                (not select-method))
9978       (if (and gnus-move-split-methods
9979                (not
9980                 (and (memq gnus-current-article articles)
9981                      (gnus-buffer-live-p gnus-original-article-buffer))))
9982           ;; When `gnus-move-split-methods' is non-nil, we have to
9983           ;; select an article to give `gnus-read-move-group-name' an
9984           ;; opportunity to suggest an appropriate default.  However,
9985           ;; we needn't render or mark the article.
9986           (let ((gnus-display-mime-function nil)
9987                 (gnus-article-prepare-hook nil)
9988                 (gnus-mark-article-hook nil))
9989             (gnus-summary-select-article nil nil nil (car articles))))
9990       (setq to-newsgroup (gnus-read-move-group-name
9991                           (cadr (assq action names))
9992                           (symbol-value
9993                            (intern (format "gnus-current-%s-group" action)))
9994                           articles prefix)
9995             encoded to-newsgroup
9996             to-method (gnus-server-to-method (gnus-group-method to-newsgroup)))
9997       (set (intern (format "gnus-current-%s-group" action))
9998            (mm-decode-coding-string
9999             to-newsgroup
10000             (gnus-group-name-charset to-method to-newsgroup))))
10001     (unless to-method
10002       (setq to-method (or select-method
10003                           (gnus-server-to-method
10004                            (gnus-group-method to-newsgroup)))))
10005     (setq to-newsgroup
10006           (or encoded
10007               (and to-newsgroup
10008                    (mm-encode-coding-string
10009                     to-newsgroup
10010                     (gnus-group-name-charset to-method to-newsgroup)))))
10011     ;; Check the method we are to move this article to...
10012     (unless (gnus-check-backend-function
10013              'request-accept-article (car to-method))
10014       (error "%s does not support article copying" (car to-method)))
10015     (unless (gnus-check-server to-method)
10016       (error "Can't open server %s" (car to-method)))
10017     (gnus-message 6 "%s to %s: %s..."
10018                   (caddr (assq action names))
10019                   (or (car select-method)
10020                       (gnus-group-decoded-name to-newsgroup))
10021                   articles)
10022     (while articles
10023       (setq article (pop articles))
10024       ;; Set any marks that may have changed in the summary buffer.
10025       (when gnus-preserve-marks
10026         (gnus-summary-push-marks-to-backend article))
10027       (setq
10028        art-group
10029        (cond
10030         ;; Move the article.
10031         ((eq action 'move)
10032          ;; Remove this article from future suppression.
10033          (gnus-dup-unsuppress-article article)
10034          (let* ((from-method (gnus-find-method-for-group
10035                               gnus-newsgroup-name))
10036                 (to-method (or select-method
10037                                (gnus-find-method-for-group to-newsgroup)))
10038                 (move-is-internal (gnus-server-equal from-method to-method)))
10039            (gnus-request-move-article
10040             article                     ; Article to move
10041             gnus-newsgroup-name         ; From newsgroup
10042             (nth 1 (gnus-find-method-for-group
10043                     gnus-newsgroup-name)) ; Server
10044             (list 'gnus-request-accept-article
10045                   to-newsgroup (list 'quote select-method)
10046                   (not articles) t)     ; Accept form
10047             (not articles)              ; Only save nov last time
10048             (and move-is-internal
10049                  to-newsgroup           ; Not respooling
10050                                         ; Is this move internal?
10051                  (gnus-group-real-name to-newsgroup)))))
10052         ;; Copy the article.
10053         ((eq action 'copy)
10054          (with-current-buffer copy-buf
10055            (when (gnus-request-article-this-buffer article
10056                                                    gnus-newsgroup-name)
10057              (save-restriction
10058                (nnheader-narrow-to-headers)
10059                (dolist (hdr gnus-copy-article-ignored-headers)
10060                  (message-remove-header hdr t)))
10061              (gnus-request-accept-article
10062               to-newsgroup select-method (not articles) t))))
10063         ;; Crosspost the article.
10064         ((eq action 'crosspost)
10065          (let ((xref (message-tokenize-header
10066                       (mail-header-xref (gnus-summary-article-header
10067                                          article))
10068                       " ")))
10069            (setq new-xref (concat (gnus-group-real-name gnus-newsgroup-name)
10070                                   ":" (number-to-string article)))
10071            (unless xref
10072              (setq xref (list (system-name))))
10073            (setq new-xref
10074                  (concat
10075                   (mapconcat 'identity
10076                              (delete "Xref:" (delete new-xref xref))
10077                              " ")
10078                   " " new-xref))
10079            (with-current-buffer copy-buf
10080              ;; First put the article in the destination group.
10081              (gnus-request-article-this-buffer article gnus-newsgroup-name)
10082              (when (consp (setq art-group
10083                                 (gnus-request-accept-article
10084                                  to-newsgroup select-method (not articles)
10085                                  t)))
10086                (setq new-xref (concat new-xref " " (car art-group)
10087                                       ":"
10088                                       (number-to-string (cdr art-group))))
10089                ;; Now we have the new Xrefs header, so we insert
10090                ;; it and replace the new article.
10091                (nnheader-replace-header "Xref" new-xref)
10092                (gnus-request-replace-article
10093                 (cdr art-group) to-newsgroup (current-buffer) t)
10094                art-group))))))
10095       (cond
10096        ((not art-group)
10097         (gnus-message 1 "Couldn't %s article %s: %s"
10098                       (cadr (assq action names)) article
10099                       (nnheader-get-report (car to-method))))
10100        ((eq art-group 'junk)
10101         (when (eq action 'move)
10102           (gnus-summary-mark-article article gnus-canceled-mark)
10103           (gnus-message 4 "Deleted article %s" article)
10104           ;; run the delete hook
10105           (run-hook-with-args 'gnus-summary-article-delete-hook
10106                               action
10107                               (gnus-data-header
10108                                (assoc article (gnus-data-list nil)))
10109                               gnus-newsgroup-name nil
10110                               select-method)))
10111        (t
10112         (let* ((pto-group (gnus-group-prefixed-name
10113                            (car art-group) to-method))
10114                (info (gnus-get-info pto-group))
10115                (to-group (gnus-info-group info))
10116                to-marks)
10117           ;; Update the group that has been moved to.
10118           (when (and info
10119                      (memq action '(move copy)))
10120             (unless (member to-group to-groups)
10121               (push to-group to-groups))
10122
10123             (when (and (not (memq article gnus-newsgroup-unreads))
10124                        (cdr art-group))
10125               (push 'read to-marks)
10126               (gnus-info-set-read
10127                info (gnus-add-to-range (gnus-info-read info)
10128                                        (list (cdr art-group)))))
10129
10130             ;; See whether the article is to be put in the cache.
10131             (let* ((expirable (gnus-group-auto-expirable-p to-group))
10132                    (marks (if expirable
10133                               gnus-article-mark-lists
10134                             (delete '(expirable . expire)
10135                                     (copy-sequence
10136                                      gnus-article-mark-lists))))
10137                    (to-article (cdr art-group)))
10138
10139               ;; Enter the article into the cache in the new group,
10140               ;; if that is required.
10141               (when (and to-article
10142                          gnus-use-cache)
10143                 (gnus-cache-possibly-enter-article
10144                  to-group to-article
10145                  (memq article gnus-newsgroup-marked)
10146                  (memq article gnus-newsgroup-dormant)
10147                  (memq article gnus-newsgroup-unreads)))
10148
10149               (when (and gnus-preserve-marks
10150                          to-article)
10151                 ;; Copy any marks over to the new group.
10152                 (when (and (equal to-group gnus-newsgroup-name)
10153                            (not (memq article gnus-newsgroup-unreads)))
10154                   ;; Mark this article as read in this group.
10155                   (push (cons to-article gnus-read-mark)
10156                         gnus-newsgroup-reads)
10157                   ;; Increase the active status of this group.
10158                   (setcdr (gnus-active to-group) to-article)
10159                   (setcdr gnus-newsgroup-active to-article))
10160
10161                 (while marks
10162                   (when (eq (gnus-article-mark-to-type (cdar marks)) 'list)
10163                     (when (memq article (symbol-value
10164                                          (intern (format "gnus-newsgroup-%s"
10165                                                          (caar marks)))))
10166                       (push (cdar marks) to-marks)
10167                       ;; If the other group is the same as this group,
10168                       ;; then we have to add the mark to the list.
10169                       (when (equal to-group gnus-newsgroup-name)
10170                         (set (intern (format "gnus-newsgroup-%s"
10171                                              (caar marks)))
10172                              (cons to-article
10173                                    (symbol-value
10174                                     (intern (format "gnus-newsgroup-%s"
10175                                                     (caar marks)))))))
10176                       ;; Copy the marks to other group.
10177                       (gnus-add-marked-articles
10178                        to-group (cdar marks) (list to-article) info)))
10179                   (setq marks (cdr marks)))
10180
10181                 (when (and expirable
10182                            gnus-mark-copied-or-moved-articles-as-expirable
10183                            (not (memq 'expire to-marks)))
10184                   ;; Mark this article as expirable.
10185                   (push 'expire to-marks)
10186                   (when (equal to-group gnus-newsgroup-name)
10187                     (push to-article gnus-newsgroup-expirable))
10188                   ;; Copy the expirable mark to other group.
10189                   (gnus-add-marked-articles
10190                    to-group 'expire (list to-article) info))
10191
10192                 (when (and to-marks
10193                            (gnus-method-option-p
10194                             (gnus-find-method-for-group to-group)
10195                             'server-marks))
10196                   (gnus-request-set-mark
10197                    to-group (list (list (list to-article) 'add to-marks)))))
10198
10199               (gnus-dribble-enter
10200                (concat "(gnus-group-set-info '"
10201                        (gnus-prin1-to-string (gnus-get-info to-group))
10202                        ")")
10203                (concat "^(gnus-group-set-info '(\""
10204                        (regexp-quote to-group) "\""))))
10205
10206           ;; Update the Xref header in this article to point to
10207           ;; the new crossposted article we have just created.
10208           (when (eq action 'crosspost)
10209             (with-current-buffer copy-buf
10210               (gnus-request-article-this-buffer article gnus-newsgroup-name)
10211               (nnheader-replace-header "Xref" new-xref)
10212               (gnus-request-replace-article
10213                article gnus-newsgroup-name (current-buffer) t)))
10214
10215           ;; run the move/copy/crosspost/respool hook
10216           (run-hook-with-args 'gnus-summary-article-move-hook
10217                               action
10218                               (gnus-data-header
10219                                (assoc article (gnus-data-list nil)))
10220                               gnus-newsgroup-name
10221                               to-newsgroup
10222                               select-method))
10223
10224         ;;;!!!Why is this necessary?
10225         (set-buffer gnus-summary-buffer)
10226
10227         (when (eq action 'move)
10228           (save-excursion
10229             (gnus-summary-goto-subject article)
10230             (gnus-summary-mark-article article gnus-canceled-mark)))))
10231       (push article articles-to-update-marks))
10232
10233     (save-excursion
10234       (apply 'gnus-summary-remove-process-mark articles-to-update-marks))
10235     ;; Re-activate all groups that have been moved to.
10236     (with-current-buffer gnus-group-buffer
10237       (let ((gnus-group-marked to-groups))
10238         (gnus-group-get-new-news-this-group nil t)))
10239
10240     (gnus-kill-buffer copy-buf)
10241     (gnus-summary-position-point)
10242     (gnus-set-mode-line 'summary)))
10243
10244 (defun gnus-summary-push-marks-to-backend (article)
10245   (let ((set nil)
10246         (del nil)
10247         (marks gnus-article-mark-lists))
10248     (unless (memq article gnus-newsgroup-unreads)
10249       (push 'read set))
10250     (while marks
10251       (if (and (eq (gnus-article-mark-to-type (cdar marks)) 'list)
10252                (memq article (symbol-value
10253                               (intern (format "gnus-newsgroup-%s"
10254                                               (caar marks))))))
10255           (push (cdar marks) set)
10256         (push (cdar marks) del))
10257       (pop marks))
10258     (gnus-request-set-mark gnus-newsgroup-name `(((,article) set ,set)
10259                                                  ((,article) del ,del)))))
10260
10261 (defun gnus-summary-copy-article (&optional n to-newsgroup select-method)
10262   "Copy the current article to some other group.
10263 If TO-NEWSGROUP is string, do not prompt for a newsgroup to copy to.
10264 When called interactively, if TO-NEWSGROUP is nil, use the value of
10265 the variable `gnus-move-split-methods' for finding a default target
10266 newsgroup.
10267 If SELECT-METHOD is non-nil, do not move to a specific newsgroup, but
10268 re-spool using this method."
10269   (interactive "P")
10270   (gnus-summary-move-article n to-newsgroup select-method 'copy))
10271
10272 (defun gnus-summary-crosspost-article (&optional n)
10273   "Crosspost the current article to some other group."
10274   (interactive "P")
10275   (gnus-summary-move-article n nil nil 'crosspost))
10276
10277 (defcustom gnus-summary-respool-default-method nil
10278   "Default method type for respooling an article.
10279 If nil, use to the current newsgroup method."
10280   :type 'symbol
10281   :group 'gnus-summary-mail)
10282
10283 (defun gnus-summary-respool-article (&optional n method)
10284   "Respool the current article.
10285 The article will be squeezed through the mail spooling process again,
10286 which means that it will be put in some mail newsgroup or other
10287 depending on `nnmail-split-methods'.
10288 If N is a positive number, respool the N next articles.
10289 If N is a negative number, respool the N previous articles.
10290 If N is nil and any articles have been marked with the process mark,
10291 respool those articles instead.
10292
10293 Respooling can be done both from mail groups and \"real\" newsgroups.
10294 In the former case, the articles in question will be moved from the
10295 current group into whatever groups they are destined to.  In the
10296 latter case, they will be copied into the relevant groups."
10297   (interactive
10298    (list current-prefix-arg
10299          (let* ((methods (mapcar #'car (gnus-methods-using 'respool)))
10300                 (methname
10301                  (symbol-name (or gnus-summary-respool-default-method
10302                                   (car (gnus-find-method-for-group
10303                                         gnus-newsgroup-name)))))
10304                 (method
10305                  (gnus-completing-read
10306                   "Backend to use when respooling"
10307                   methods t nil 'gnus-mail-method-history methname))
10308                 ms)
10309            (cond
10310             ((zerop (length (setq ms (gnus-servers-using-backend
10311                                       (intern method)))))
10312              (list (intern method) ""))
10313             ((= 1 (length ms))
10314              (car ms))
10315             (t
10316              (let ((ms-alist (mapcar (lambda (m) (cons (cadr m) m)) ms)))
10317                (cdr (assoc (gnus-completing-read "Server name" ms-alist t)
10318                            ms-alist))))))))
10319   (unless method
10320     (error "No method given for respooling"))
10321   (if (assoc (symbol-name
10322               (car (gnus-find-method-for-group gnus-newsgroup-name)))
10323              (gnus-methods-using 'respool))
10324       (gnus-summary-move-article n nil method)
10325     (gnus-summary-copy-article n nil method)))
10326
10327 (defun gnus-summary-import-article (file &optional edit)
10328   "Import an arbitrary file into a mail newsgroup."
10329   (interactive "fImport file: \nP")
10330   (let ((group gnus-newsgroup-name)
10331         (now (current-time))
10332         atts lines group-art)
10333     (unless (gnus-check-backend-function 'request-accept-article group)
10334       (error "%s does not support article importing" group))
10335     (or (file-readable-p file)
10336         (not (file-regular-p file))
10337         (error "Can't read %s" file))
10338     (with-current-buffer (gnus-get-buffer-create " *import file*")
10339       (erase-buffer)
10340       (nnheader-insert-file-contents file)
10341       (goto-char (point-min))
10342       (if (nnheader-article-p)
10343           (save-restriction
10344             (goto-char (point-min))
10345             (search-forward "\n\n" nil t)
10346             (narrow-to-region (point-min) (1- (point)))
10347             (goto-char (point-min))
10348             (unless (re-search-forward "^date:" nil t)
10349               (goto-char (point-max))
10350               (insert "Date: " (message-make-date (nth 5 atts)) "\n")))
10351        ;; This doesn't look like an article, so we fudge some headers.
10352         (setq atts (file-attributes file)
10353               lines (count-lines (point-min) (point-max)))
10354         (insert "From: " (read-string "From: ") "\n"
10355                 "Subject: " (read-string "Subject: ") "\n"
10356                 "Date: " (message-make-date (nth 5 atts)) "\n"
10357                 "Message-ID: " (message-make-message-id) "\n"
10358                 "Lines: " (int-to-string lines) "\n"
10359                 "Chars: " (int-to-string (nth 7 atts)) "\n\n"))
10360       (setq group-art (gnus-request-accept-article group nil t))
10361       (kill-buffer (current-buffer)))
10362     (setq gnus-newsgroup-active (gnus-activate-group group))
10363     (forward-line 1)
10364     (gnus-summary-goto-article (cdr group-art) nil t)
10365     (when edit
10366       (gnus-summary-edit-article))))
10367
10368 (defun gnus-summary-create-article ()
10369   "Create an article in a mail newsgroup."
10370   (interactive)
10371   (let ((group gnus-newsgroup-name)
10372         (now (current-time))
10373         group-art)
10374     (unless (gnus-check-backend-function 'request-accept-article group)
10375       (error "%s does not support article importing" group))
10376     (with-current-buffer (gnus-get-buffer-create " *import file*")
10377       (erase-buffer)
10378       (goto-char (point-min))
10379       ;; This doesn't look like an article, so we fudge some headers.
10380       (insert "From: " (read-string "From: ") "\n"
10381               "Subject: " (read-string "Subject: ") "\n"
10382               "Date: " (message-make-date now) "\n"
10383               "Message-ID: " (message-make-message-id) "\n")
10384       (setq group-art (gnus-request-accept-article group nil t))
10385       (kill-buffer (current-buffer)))
10386     (setq gnus-newsgroup-active (gnus-activate-group group))
10387     (forward-line 1)
10388     (gnus-summary-goto-article (cdr group-art) nil t)
10389     (gnus-summary-edit-article)))
10390
10391 (defun gnus-summary-article-posted-p ()
10392   "Say whether the current (mail) article is available from news as well.
10393 This will be the case if the article has both been mailed and posted."
10394   (interactive)
10395   (let ((id (mail-header-references (gnus-summary-article-header)))
10396         (gnus-override-method (car (gnus-refer-article-methods))))
10397     (if (gnus-request-head id "")
10398         (gnus-message 2 "The current message was found on %s"
10399                       gnus-override-method)
10400       (gnus-message 2 "The current message couldn't be found on %s"
10401                     gnus-override-method)
10402       nil)))
10403
10404 (defun gnus-summary-expire-articles (&optional now)
10405   "Expire all articles that are marked as expirable in the current group."
10406   (interactive)
10407   (when (and (not gnus-group-is-exiting-without-update-p)
10408              (gnus-check-backend-function
10409               'request-expire-articles gnus-newsgroup-name))
10410     ;; This backend supports expiry.
10411     (let* ((total (gnus-group-total-expirable-p gnus-newsgroup-name))
10412            (expirable
10413             (gnus-list-range-difference
10414              (if total
10415                  (progn
10416                    ;; We need to update the info for
10417                    ;; this group for `gnus-list-of-read-articles'
10418                    ;; to give us the right answer.
10419                    (gnus-run-hooks 'gnus-exit-group-hook)
10420                    (gnus-summary-update-info)
10421                    (gnus-list-of-read-articles gnus-newsgroup-name))
10422                (setq gnus-newsgroup-expirable
10423                      (sort gnus-newsgroup-expirable '<)))
10424              gnus-newsgroup-unexist))
10425            (expiry-wait (if now 'immediate
10426                           (gnus-group-find-parameter
10427                            gnus-newsgroup-name 'expiry-wait)))
10428            (nnmail-expiry-target
10429             (or (gnus-group-find-parameter gnus-newsgroup-name 'expiry-target)
10430                 nnmail-expiry-target))
10431            es)
10432       (when expirable
10433         ;; There are expirable articles in this group, so we run them
10434         ;; through the expiry process.
10435         (gnus-message 6 "Expiring articles...")
10436         (when (gnus-check-group gnus-newsgroup-name)
10437           ;; The list of articles that weren't expired is returned.
10438           (save-excursion
10439             (if expiry-wait
10440                 (let ((nnmail-expiry-wait-function nil)
10441                       (nnmail-expiry-wait expiry-wait))
10442                   (setq es (gnus-request-expire-articles
10443                             expirable gnus-newsgroup-name)))
10444               (setq es (gnus-request-expire-articles
10445                         expirable gnus-newsgroup-name)))
10446             (unless total
10447               (setq gnus-newsgroup-expirable es))
10448             ;; We go through the old list of expirable, and mark all
10449             ;; really expired articles as nonexistent.
10450             (unless (eq es expirable) ;If nothing was expired, we don't mark.
10451               (let ((gnus-use-cache nil))
10452                 (dolist (article expirable)
10453                   (when (and (not (memq article es))
10454                              (gnus-data-find article))
10455                     (gnus-summary-mark-article article gnus-canceled-mark)
10456                     (run-hook-with-args
10457                      'gnus-summary-article-expire-hook
10458                      'delete
10459                      (gnus-data-header (assoc article (gnus-data-list nil)))
10460                      gnus-newsgroup-name
10461                      (cond
10462                       ((stringp nnmail-expiry-target) nnmail-expiry-target)
10463                       ((eq nnmail-expiry-target 'delete) nil)
10464                       (t
10465                        (let ((rescall (funcall nnmail-expiry-target
10466                                                gnus-newsgroup-name)))
10467                          (if (stringp rescall) rescall nil))))
10468                      nil)))))))
10469         (gnus-message 6 "Expiring articles...done")))))
10470
10471 (defun gnus-summary-expire-articles-now ()
10472   "Expunge all expirable articles in the current group.
10473 This means that *all* articles that are marked as expirable will be
10474 deleted forever, right now."
10475   (interactive)
10476   (or gnus-expert-user
10477       (gnus-yes-or-no-p
10478        "Are you really, really sure you want to delete all expirable messages? ")
10479       (error "Phew!"))
10480   (gnus-summary-expire-articles t))
10481
10482 ;; Suggested by Jack Vinson <vinson@unagi.cis.upenn.edu>.
10483 (defun gnus-summary-delete-article (&optional n)
10484   "Delete the N next (mail) articles.
10485 This command actually deletes articles.  This is not a marking
10486 command.  The article will disappear forever from your life, never to
10487 return.
10488
10489 If N is negative, delete backwards.
10490 If N is nil and articles have been marked with the process mark,
10491 delete these instead.
10492
10493 If `gnus-novice-user' is non-nil you will be asked for
10494 confirmation before the articles are deleted."
10495   (interactive "P")
10496   (unless (gnus-check-backend-function 'request-expire-articles
10497                                        gnus-newsgroup-name)
10498     (error "The current newsgroup does not support article deletion"))
10499   (unless (gnus-check-server (gnus-find-method-for-group gnus-newsgroup-name))
10500     (error "Couldn't open server"))
10501   ;; Compute the list of articles to delete.
10502   (let ((articles (sort (copy-sequence (gnus-summary-work-articles n)) '<))
10503         (nnmail-expiry-target 'delete)
10504         not-deleted)
10505     (if (and gnus-novice-user
10506              (not (gnus-yes-or-no-p
10507                    (format "Do you really want to delete %s forever? "
10508                            (if (> (length articles) 1)
10509                                (format "these %s articles" (length articles))
10510                              "this article")))))
10511         ()
10512       ;; Delete the articles.
10513       (setq not-deleted (gnus-request-expire-articles
10514                          articles gnus-newsgroup-name 'force))
10515       (save-excursion
10516         (while articles
10517           (gnus-summary-remove-process-mark (car articles))
10518           ;; The backend might not have been able to delete the article
10519           ;; after all.
10520           (unless (memq (car articles) not-deleted)
10521             (gnus-summary-mark-article (car articles) gnus-canceled-mark)
10522             (let* ((article (car articles))
10523                    (ghead  (gnus-data-header
10524                             (assoc article (gnus-data-list nil)))))
10525               (run-hook-with-args 'gnus-summary-article-delete-hook
10526                                   'delete ghead gnus-newsgroup-name nil
10527                                   nil)))
10528           (setq articles (cdr articles))))
10529       (when not-deleted
10530         (gnus-message 4 "Couldn't delete articles %s" not-deleted)))
10531     (gnus-summary-position-point)
10532     (gnus-set-mode-line 'summary)
10533     not-deleted))
10534
10535 (defun gnus-summary-edit-article (&optional arg)
10536   "Edit the current article.
10537 This will have permanent effect only in mail groups.
10538 If ARG is nil, edit the decoded articles.
10539 If ARG is 1, edit the raw articles.
10540 If ARG is 2, edit the raw articles even in read-only groups.
10541 If ARG is 3, edit the articles with the current handles.
10542 Otherwise, allow editing of articles even in read-only
10543 groups."
10544   (interactive "P")
10545   (let (force raw current-handles)
10546     (cond
10547      ((null arg))
10548      ((eq arg 1)
10549       (setq raw t))
10550      ((eq arg 2)
10551       (setq raw t
10552             force t))
10553      ((eq arg 3)
10554       (setq current-handles
10555             (and (gnus-buffer-live-p gnus-article-buffer)
10556                  (with-current-buffer gnus-article-buffer
10557                    (prog1
10558                        gnus-article-mime-handles
10559                      (setq gnus-article-mime-handles nil))))))
10560      (t
10561       (setq force t)))
10562     (when (and raw (not force)
10563                (member gnus-newsgroup-name '("nndraft:delayed"
10564                                              "nndraft:drafts"
10565                                              "nndraft:queue")))
10566       (error "Can't edit the raw article in group %s"
10567              gnus-newsgroup-name))
10568     (with-current-buffer gnus-summary-buffer
10569       (let ((mail-parse-charset gnus-newsgroup-charset)
10570             (mail-parse-ignored-charsets gnus-newsgroup-ignored-charsets))
10571         (gnus-set-global-variables)
10572         (when (and (not force)
10573                    (gnus-group-read-only-p))
10574           (error "The current newsgroup does not support article editing"))
10575         (gnus-summary-show-article t)
10576         (when (and (not raw) (gnus-buffer-live-p gnus-article-buffer))
10577           (with-current-buffer gnus-article-buffer
10578             (mm-enable-multibyte)))
10579         (if (member gnus-newsgroup-name '("nndraft:delayed" "nndraft:drafts"))
10580             (setq raw t))
10581         (gnus-article-edit-article
10582          (if raw 'ignore
10583            `(lambda ()
10584               (let ((mbl mml-buffer-list))
10585                 (setq mml-buffer-list nil)
10586                 (let ((rfc2047-quote-decoded-words-containing-tspecials t))
10587                   (mime-to-mml ,'current-handles))
10588                 (let ((mbl1 mml-buffer-list))
10589                   (setq mml-buffer-list mbl)
10590                   (set (make-local-variable 'mml-buffer-list) mbl1))
10591                 (gnus-make-local-hook 'kill-buffer-hook)
10592                 (add-hook 'kill-buffer-hook 'mml-destroy-buffers t t))))
10593          `(lambda (no-highlight)
10594             (let ((mail-parse-charset ',gnus-newsgroup-charset)
10595                   (message-options message-options)
10596                   (message-options-set-recipient)
10597                   (mail-parse-ignored-charsets
10598                    ',gnus-newsgroup-ignored-charsets)
10599                   (rfc2047-header-encoding-alist
10600                    ',(let ((charset (gnus-group-name-charset
10601                                      (gnus-find-method-for-group
10602                                       gnus-newsgroup-name)
10603                                      gnus-newsgroup-name)))
10604                        (append (list (cons "Newsgroups" charset)
10605                                      (cons "Followup-To" charset)
10606                                      (cons "Xref" charset))
10607                                rfc2047-header-encoding-alist))))
10608               ,(if (not raw) '(progn
10609                                 (mml-to-mime)
10610                                 (mml-destroy-buffers)
10611                                 (remove-hook 'kill-buffer-hook
10612                                              'mml-destroy-buffers t)
10613                                 (kill-local-variable 'mml-buffer-list)))
10614               (gnus-summary-edit-article-done
10615                ,(or (mail-header-references gnus-current-headers) "")
10616                ,(gnus-group-read-only-p)
10617                ,gnus-summary-buffer no-highlight))))))))
10618
10619 (defalias 'gnus-summary-edit-article-postpone 'gnus-article-edit-exit)
10620
10621 (defun gnus-summary-edit-article-done (&optional references read-only buffer
10622                                                  no-highlight)
10623   "Make edits to the current article permanent."
10624   (interactive)
10625   (save-excursion
10626     ;; The buffer restriction contains the entire article if it exists.
10627     (when (article-goto-body)
10628       (let ((lines (count-lines (point) (point-max)))
10629             (length (- (point-max) (point)))
10630             (case-fold-search t)
10631             (body (point-marker)))
10632         (goto-char (point-min))
10633         (when (re-search-forward "^content-length:[ \t]\\([0-9]+\\)" body t)
10634           (delete-region (match-beginning 1) (match-end 1))
10635           (insert (number-to-string length)))
10636         (goto-char (point-min))
10637         (when (re-search-forward
10638                "^x-content-length:[ \t]\\([0-9]+\\)" body t)
10639           (delete-region (match-beginning 1) (match-end 1))
10640           (insert (number-to-string length)))
10641         (goto-char (point-min))
10642         (when (re-search-forward "^lines:[ \t]\\([0-9]+\\)" body t)
10643           (delete-region (match-beginning 1) (match-end 1))
10644           (insert (number-to-string lines))))))
10645   ;; Replace the article.
10646   (let ((buf (current-buffer))
10647         (article (cdr gnus-article-current))
10648         replace-result)
10649     (with-temp-buffer
10650       (insert-buffer-substring buf)
10651       (if (and (not read-only)
10652                (not (setq replace-result
10653                           (gnus-request-replace-article
10654                            article (car gnus-article-current)
10655                            (current-buffer) t))))
10656           (error "Couldn't replace article")
10657         ;; If we got a number back, then that's the new article number
10658         ;; for this article.  Otherwise, the article number didn't change.
10659         (when (numberp replace-result)
10660           (with-current-buffer gnus-summary-buffer
10661             (setq gnus-newsgroup-limit (delq article gnus-newsgroup-limit))
10662             (gnus-summary-limit gnus-newsgroup-limit)
10663             (setq article replace-result)
10664             (gnus-summary-goto-subject article t)))
10665         ;; Update the summary buffer.
10666         (if (and references
10667                  (equal (message-tokenize-header references " ")
10668                         (message-tokenize-header
10669                          (or (message-fetch-field "references") "") " ")))
10670             ;; We only have to update this line.
10671             (save-excursion
10672               (save-restriction
10673                 (message-narrow-to-head)
10674                 (let ((head (buffer-substring-no-properties
10675                              (point-min) (point-max)))
10676                       header)
10677                   (with-temp-buffer
10678                     (insert (format "211 %d Article retrieved.\n" article))
10679                     (insert head)
10680                     (insert ".\n")
10681                     (let ((nntp-server-buffer (current-buffer)))
10682                       (setq header (car (gnus-get-newsgroup-headers nil t))))
10683                     (with-current-buffer gnus-summary-buffer
10684                       (gnus-data-set-header (gnus-data-find article) header)
10685                       (gnus-summary-update-article-line article header)
10686                       (if (gnus-summary-goto-subject article nil t)
10687                           (gnus-summary-update-secondary-mark article)))))))
10688           ;; Update threads.
10689           (set-buffer (or buffer gnus-summary-buffer))
10690           (gnus-summary-update-article article)
10691           (if (gnus-summary-goto-subject article nil t)
10692               (gnus-summary-update-secondary-mark article)))
10693         ;; Prettify the article buffer again.
10694         (unless no-highlight
10695           (with-current-buffer gnus-article-buffer
10696             ;;!!! Fix this -- article should be rehighlighted.
10697             ;;(gnus-run-hooks 'gnus-article-display-hook)
10698             (set-buffer gnus-original-article-buffer)
10699             (gnus-request-article
10700              article (car gnus-article-current) (current-buffer))))
10701         ;; Prettify the summary buffer line.
10702         (when (gnus-visual-p 'summary-highlight 'highlight)
10703           (gnus-run-hooks 'gnus-visual-mark-article-hook))))))
10704
10705 (defun gnus-summary-edit-wash (key)
10706   "Perform editing command KEY in the article buffer."
10707   (interactive
10708    (list
10709     (progn
10710       (message "%s" (concat (this-command-keys) "- "))
10711       (read-char))))
10712   (message "")
10713   (gnus-summary-edit-article)
10714   (execute-kbd-macro (concat (this-command-keys) key))
10715   (gnus-article-edit-done))
10716
10717 ;;; Respooling
10718
10719 (defvar nnimap-split-fancy)
10720 (defvar nnimap-split-methods)
10721
10722 (defun gnus-summary-respool-query (&optional silent trace)
10723   "Query where the respool algorithm would put this article."
10724   (interactive)
10725   (let (gnus-mark-article-hook)
10726     (gnus-summary-select-article)
10727     (with-current-buffer gnus-original-article-buffer
10728       (let ((groups
10729              (if (eq (car (gnus-find-method-for-group gnus-newsgroup-name))
10730                      'nnimap)
10731                  ;; nnimap has its own splitting variables.
10732                  (let ((nnmail-split-methods
10733                         (cond
10734                          ((eq nnimap-split-methods 'default)
10735                           nnmail-split-methods)
10736                          (nnimap-split-methods
10737                           nnimap-split-methods)
10738                          (nnimap-split-fancy
10739                           'nnmail-split-fancy)))
10740                        (nnmail-split-fancy (or nnimap-split-fancy
10741                                                nnmail-split-fancy)))
10742                    (nnmail-article-group 'identity trace))
10743                (nnmail-article-group 'identity trace))))
10744         (unless silent
10745           (if groups
10746               (message "This message would go to %s"
10747                        (mapconcat 'car groups ", "))
10748             (message "This message would go to no groups"))
10749           groups)))))
10750
10751 (defun gnus-summary-respool-trace ()
10752   "Trace where the respool algorithm would put this article.
10753 Display a buffer showing all fancy splitting patterns which matched."
10754   (interactive)
10755   (gnus-summary-respool-query nil t))
10756
10757 ;; Summary marking commands.
10758
10759 (defun gnus-summary-kill-same-subject-and-select (&optional unmark)
10760   "Mark articles which has the same subject as read, and then select the next.
10761 If UNMARK is positive, remove any kind of mark.
10762 If UNMARK is negative, tick articles."
10763   (interactive "P")
10764   (when unmark
10765     (setq unmark (prefix-numeric-value unmark)))
10766   (let ((count
10767          (gnus-summary-mark-same-subject
10768           (gnus-summary-article-subject) unmark)))
10769     ;; Select next unread article.  If auto-select-same mode, should
10770     ;; select the first unread article.
10771     (gnus-summary-next-article t (and gnus-auto-select-same
10772                                       (gnus-summary-article-subject)))
10773     (gnus-message 7 "%d article%s marked as %s"
10774                   count (if (= count 1) " is" "s are")
10775                   (if unmark "unread" "read"))))
10776
10777 (defun gnus-summary-kill-same-subject (&optional unmark)
10778   "Mark articles which has the same subject as read.
10779 If UNMARK is positive, remove any kind of mark.
10780 If UNMARK is negative, tick articles."
10781   (interactive "P")
10782   (when unmark
10783     (setq unmark (prefix-numeric-value unmark)))
10784   (let ((count
10785          (gnus-summary-mark-same-subject
10786           (gnus-summary-article-subject) unmark)))
10787     ;; If marked as read, go to next unread subject.
10788     (when (null unmark)
10789       ;; Go to next unread subject.
10790       (gnus-summary-next-subject 1 t))
10791     (gnus-message 7 "%d articles are marked as %s"
10792                   count (if unmark "unread" "read"))))
10793
10794 (defun gnus-summary-mark-same-subject (subject &optional unmark)
10795   "Mark articles with same SUBJECT as read, and return marked number.
10796 If optional argument UNMARK is positive, remove any kinds of marks.
10797 If optional argument UNMARK is negative, mark articles as unread instead."
10798   (let ((count 1))
10799     (save-excursion
10800       (cond
10801        ((null unmark)                   ; Mark as read.
10802         (while (and
10803                 (progn
10804                   (gnus-summary-mark-article-as-read gnus-killed-mark)
10805                   (gnus-summary-show-thread) t)
10806                 (gnus-summary-find-subject subject))
10807           (setq count (1+ count))))
10808        ((> unmark 0)                    ; Tick.
10809         (while (and
10810                 (progn
10811                   (gnus-summary-mark-article-as-unread gnus-ticked-mark)
10812                   (gnus-summary-show-thread) t)
10813                 (gnus-summary-find-subject subject))
10814           (setq count (1+ count))))
10815        (t                               ; Mark as unread.
10816         (while (and
10817                 (progn
10818                   (gnus-summary-mark-article-as-unread gnus-unread-mark)
10819                   (gnus-summary-show-thread) t)
10820                 (gnus-summary-find-subject subject))
10821           (setq count (1+ count)))))
10822       (gnus-set-mode-line 'summary)
10823       ;; Return the number of marked articles.
10824       count)))
10825
10826 (defun gnus-summary-mark-as-processable (n &optional unmark)
10827   "Set the process mark on the next N articles.
10828 If N is negative, mark backward instead.  If UNMARK is non-nil, remove
10829 the process mark instead.  The difference between N and the actual
10830 number of articles marked is returned."
10831   (interactive "P")
10832   (if (and (null n) (gnus-region-active-p))
10833       (gnus-uu-mark-region (region-beginning) (region-end) unmark)
10834     (setq n (prefix-numeric-value n))
10835     (let ((backward (< n 0))
10836           (n (abs n)))
10837       (while (and
10838               (> n 0)
10839               (if unmark
10840                   (gnus-summary-remove-process-mark
10841                    (gnus-summary-article-number))
10842                 (gnus-summary-set-process-mark (gnus-summary-article-number)))
10843               (zerop (gnus-summary-next-subject (if backward -1 1) nil t)))
10844         (setq n (1- n)))
10845       (when (/= 0 n)
10846         (gnus-message 7 "No more articles"))
10847       (gnus-summary-recenter)
10848       (gnus-summary-position-point)
10849       n)))
10850
10851 (defun gnus-summary-unmark-as-processable (n)
10852   "Remove the process mark from the next N articles.
10853 If N is negative, unmark backward instead.  The difference between N and
10854 the actual number of articles unmarked is returned."
10855   (interactive "P")
10856   (gnus-summary-mark-as-processable n t))
10857
10858 (defun gnus-summary-unmark-all-processable ()
10859   "Remove the process mark from all articles."
10860   (interactive)
10861   (save-excursion
10862     (while gnus-newsgroup-processable
10863       (gnus-summary-remove-process-mark (car gnus-newsgroup-processable))))
10864   (gnus-summary-position-point))
10865
10866 (defun gnus-summary-add-mark (article type)
10867   "Mark ARTICLE with a mark of TYPE."
10868   (let ((vtype (car (assq type gnus-article-mark-lists)))
10869         var)
10870     (if (not vtype)
10871         (error "No such mark type: %s" type)
10872       (setq var (intern (format "gnus-newsgroup-%s" type)))
10873       (set var (cons article (symbol-value var)))
10874       (if (memq type '(processable cached replied forwarded recent saved))
10875           (gnus-summary-update-secondary-mark article)
10876         ;;; !!! This is bogus.  We should find out what primary
10877         ;;; !!! mark we want to set.
10878         (gnus-summary-update-mark gnus-del-mark 'unread)))))
10879
10880 (defun gnus-summary-mark-as-expirable (n)
10881   "Mark N articles forward as expirable.
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-expirable-mark))
10886
10887 (defun gnus-summary-mark-as-spam (n)
10888   "Mark N articles forward as spam.
10889 If N is negative, mark backward instead.  The difference between N and
10890 the actual number of articles marked is returned."
10891   (interactive "p")
10892   (gnus-summary-mark-forward n gnus-spam-mark))
10893
10894 (defun gnus-summary-mark-article-as-replied (article)
10895   "Mark ARTICLE as replied to and update the summary line.
10896 ARTICLE can also be a list of articles."
10897   (interactive (list (gnus-summary-article-number)))
10898   (let ((articles (if (listp article) article (list article))))
10899     (dolist (article articles)
10900       (unless (numberp article)
10901         (error "%s is not a number" article))
10902       (push article gnus-newsgroup-replied)
10903       (let ((inhibit-read-only t))
10904         (when (gnus-summary-goto-subject article nil t)
10905           (gnus-summary-update-secondary-mark article))))))
10906
10907 (defun gnus-summary-mark-article-as-forwarded (article)
10908   "Mark ARTICLE as forwarded and update the summary line.
10909 ARTICLE can also be a list of articles."
10910   (let ((articles (if (listp article) article (list article))))
10911     (dolist (article articles)
10912       (push article gnus-newsgroup-forwarded)
10913       (let ((inhibit-read-only t))
10914         (when (gnus-summary-goto-subject article nil t)
10915           (gnus-summary-update-secondary-mark article))))))
10916
10917 (defun gnus-summary-set-bookmark (article)
10918   "Set a bookmark in current article."
10919   (interactive (list (gnus-summary-article-number)))
10920   (when (or (not (get-buffer gnus-article-buffer))
10921             (not gnus-current-article)
10922             (not gnus-article-current)
10923             (not (equal gnus-newsgroup-name (car gnus-article-current))))
10924     (error "No current article selected"))
10925   ;; Remove old bookmark, if one exists.
10926   (gnus-alist-pull article gnus-newsgroup-bookmarks)
10927   ;; Set the new bookmark, which is on the form
10928   ;; (article-number . line-number-in-body).
10929   (push
10930    (cons article
10931          (with-current-buffer gnus-article-buffer
10932            (count-lines
10933             (min (point)
10934                  (save-excursion
10935                    (article-goto-body)
10936                    (point)))
10937             (point))))
10938    gnus-newsgroup-bookmarks)
10939   (gnus-message 6 "A bookmark has been added to the current article."))
10940
10941 (defun gnus-summary-remove-bookmark (article)
10942   "Remove the bookmark from the current article."
10943   (interactive (list (gnus-summary-article-number)))
10944   ;; Remove old bookmark, if one exists.
10945   (if (not (assq article gnus-newsgroup-bookmarks))
10946       (gnus-message 6 "No bookmark in current article.")
10947     (gnus-alist-pull article gnus-newsgroup-bookmarks)
10948     (gnus-message 6 "Removed bookmark.")))
10949
10950 ;; Suggested by Daniel Quinlan <quinlan@best.com>.
10951 (defun gnus-summary-mark-as-dormant (n)
10952   "Mark N articles forward as dormant.
10953 If N is negative, mark backward instead.  The difference between N and
10954 the actual number of articles marked is returned."
10955   (interactive "p")
10956   (gnus-summary-mark-forward n gnus-dormant-mark))
10957
10958 (defun gnus-summary-set-process-mark (article)
10959   "Set the process mark on ARTICLE and update the summary line."
10960   (setq gnus-newsgroup-processable
10961         (cons article
10962               (delq article gnus-newsgroup-processable)))
10963   (when (gnus-summary-goto-subject article)
10964     (gnus-summary-show-thread)
10965     (gnus-summary-goto-subject article)
10966     (gnus-summary-update-secondary-mark article)))
10967
10968 (defun gnus-summary-remove-process-mark (&rest articles)
10969   "Remove the process mark from ARTICLES and update the summary line."
10970   (dolist (article articles)
10971     (setq gnus-newsgroup-processable (delq article gnus-newsgroup-processable))
10972     (when (gnus-summary-goto-subject article)
10973       (gnus-summary-show-thread)
10974       (gnus-summary-goto-subject article)
10975       (gnus-summary-update-secondary-mark article)))
10976   t)
10977
10978 (defun gnus-summary-set-saved-mark (article)
10979   "Set the process mark on ARTICLE and update the summary line."
10980   (push article gnus-newsgroup-saved)
10981   (when (gnus-summary-goto-subject article)
10982     (gnus-summary-update-secondary-mark article)))
10983
10984 (defun gnus-summary-mark-forward (n &optional mark no-expire)
10985   "Mark N articles as read forwards.
10986 If N is negative, mark backwards instead.  Mark with MARK, ?r by default.
10987 The difference between N and the actual number of articles marked is
10988 returned.
10989 If NO-EXPIRE, auto-expiry will be inhibited."
10990   (interactive "p")
10991   (gnus-summary-show-thread)
10992   (let ((backward (< n 0))
10993         (gnus-summary-goto-unread
10994          (and gnus-summary-goto-unread
10995               (not (eq gnus-summary-goto-unread 'never))
10996               (not (memq mark (list gnus-unread-mark gnus-spam-mark
10997                                     gnus-ticked-mark gnus-dormant-mark)))))
10998         (n (abs n))
10999         (mark (or mark gnus-del-mark)))
11000     (while (and (> n 0)
11001                 (gnus-summary-mark-article nil mark no-expire)
11002                 (zerop (gnus-summary-next-subject
11003                         (if backward -1 1)
11004                         (and gnus-summary-goto-unread
11005                              (not (eq gnus-summary-goto-unread 'never)))
11006                         t)))
11007       (setq n (1- n)))
11008     (when (/= 0 n)
11009       (gnus-message 7 "No more %sarticles" (if mark "" "unread ")))
11010     (gnus-summary-recenter)
11011     (gnus-summary-position-point)
11012     (gnus-set-mode-line 'summary)
11013     n))
11014
11015 (defun gnus-summary-mark-article-as-read (mark)
11016   "Mark the current article quickly as read with MARK."
11017   (let ((article (gnus-summary-article-number)))
11018     (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
11019     (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
11020     (setq gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked))
11021     (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
11022     (push (cons article mark) gnus-newsgroup-reads)
11023     ;; Possibly remove from cache, if that is used.
11024     (when gnus-use-cache
11025       (gnus-cache-enter-remove-article article))
11026     ;; Allow the backend to change the mark.
11027     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
11028     ;; Check for auto-expiry.
11029     (when (and gnus-newsgroup-auto-expire
11030                (memq mark gnus-auto-expirable-marks))
11031       (setq mark gnus-expirable-mark)
11032       ;; Let the backend know about the mark change.
11033       (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
11034       (push article gnus-newsgroup-expirable))
11035     ;; Set the mark in the buffer.
11036     (gnus-summary-update-mark mark 'unread)
11037     t))
11038
11039 (defun gnus-summary-mark-article-as-unread (mark)
11040   "Mark the current article quickly as unread with MARK."
11041   (let* ((article (gnus-summary-article-number))
11042          (old-mark (gnus-summary-article-mark article)))
11043     ;; Allow the backend to change the mark.
11044     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
11045     (if (eq mark old-mark)
11046         t
11047       (if (<= article 0)
11048           (progn
11049             (gnus-error 1 "Can't mark negative article numbers")
11050             nil)
11051         (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
11052         (setq gnus-newsgroup-spam-marked
11053               (delq article gnus-newsgroup-spam-marked))
11054         (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
11055         (setq gnus-newsgroup-expirable (delq article gnus-newsgroup-expirable))
11056         (setq gnus-newsgroup-reads (delq article gnus-newsgroup-reads))
11057         (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
11058         (cond ((= mark gnus-ticked-mark)
11059                (setq gnus-newsgroup-marked
11060                      (gnus-add-to-sorted-list gnus-newsgroup-marked
11061                                               article)))
11062               ((= mark gnus-spam-mark)
11063                (setq gnus-newsgroup-spam-marked
11064                      (gnus-add-to-sorted-list gnus-newsgroup-spam-marked
11065                                               article)))
11066               ((= mark gnus-dormant-mark)
11067                (setq gnus-newsgroup-dormant
11068                      (gnus-add-to-sorted-list gnus-newsgroup-dormant
11069                                               article)))
11070               (t
11071                (setq gnus-newsgroup-unreads
11072                      (gnus-add-to-sorted-list gnus-newsgroup-unreads
11073                                               article))))
11074         (gnus-alist-pull article gnus-newsgroup-reads)
11075
11076         ;; See whether the article is to be put in the cache.
11077         (and gnus-use-cache
11078              (vectorp (gnus-summary-article-header article))
11079              (save-excursion
11080                (gnus-cache-possibly-enter-article
11081                 gnus-newsgroup-name article
11082                 (= mark gnus-ticked-mark)
11083                 (= mark gnus-dormant-mark) (= mark gnus-unread-mark))))
11084
11085         ;; Fix the mark.
11086         (gnus-summary-update-mark mark 'unread)
11087         t))))
11088
11089 (defun gnus-summary-mark-article (&optional article mark no-expire)
11090   "Mark ARTICLE with MARK.  MARK can be any character.
11091 Four MARK strings are reserved: `? ' (unread), `?!' (ticked),
11092 `??' (dormant) and `?E' (expirable).
11093 If MARK is nil, then the default character `?r' is used.
11094 If ARTICLE is nil, then the article on the current line will be
11095 marked.
11096 If NO-EXPIRE, auto-expiry will be inhibited."
11097   ;; The mark might be a string.
11098   (when (stringp mark)
11099     (setq mark (aref mark 0)))
11100   ;; If no mark is given, then we check auto-expiring.
11101   (when (null mark)
11102     (setq mark gnus-del-mark))
11103   (when (and (not no-expire)
11104              gnus-newsgroup-auto-expire
11105              (memq mark gnus-auto-expirable-marks))
11106     (setq mark gnus-expirable-mark))
11107   (let ((article (or article (gnus-summary-article-number)))
11108         (old-mark (gnus-summary-article-mark article)))
11109     ;; Allow the backend to change the mark.
11110     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
11111     (if (eq mark old-mark)
11112         t
11113       (unless article
11114         (error "No article on current line"))
11115       (if (not (if (or (= mark gnus-unread-mark)
11116                        (= mark gnus-ticked-mark)
11117                        (= mark gnus-spam-mark)
11118                        (= mark gnus-dormant-mark))
11119                    (gnus-mark-article-as-unread article mark)
11120                  (gnus-mark-article-as-read article mark)))
11121           t
11122         ;; See whether the article is to be put in the cache.
11123         (and gnus-use-cache
11124              (not (= mark gnus-canceled-mark))
11125              (vectorp (gnus-summary-article-header article))
11126              (save-excursion
11127                (gnus-cache-possibly-enter-article
11128                 gnus-newsgroup-name article
11129                 (= mark gnus-ticked-mark)
11130                 (= mark gnus-dormant-mark) (= mark gnus-unread-mark))))
11131
11132         (when (gnus-summary-goto-subject article nil t)
11133           (let ((inhibit-read-only t))
11134             (gnus-summary-show-thread)
11135             ;; Fix the mark.
11136             (gnus-summary-update-mark mark 'unread)
11137             t))))))
11138
11139 (defun gnus-summary-update-secondary-mark (article)
11140   "Update the secondary (read, process, cache) mark."
11141   (gnus-summary-update-mark
11142    (cond ((memq article gnus-newsgroup-processable)
11143           gnus-process-mark)
11144          ((memq article gnus-newsgroup-cached)
11145           gnus-cached-mark)
11146          ((memq article gnus-newsgroup-replied)
11147           gnus-replied-mark)
11148          ((memq article gnus-newsgroup-forwarded)
11149           gnus-forwarded-mark)
11150          ((memq article gnus-newsgroup-saved)
11151           gnus-saved-mark)
11152          ((memq article gnus-newsgroup-unseen)
11153           gnus-unseen-mark)
11154          (t gnus-no-mark))
11155    'replied)
11156   (when (gnus-visual-p 'summary-highlight 'highlight)
11157     (gnus-summary-highlight-line)
11158     (gnus-run-hooks 'gnus-summary-update-hook))
11159   t)
11160
11161 (defun gnus-summary-update-download-mark (article)
11162   "Update the download mark."
11163   (gnus-summary-update-mark
11164    (cond ((memq article gnus-newsgroup-undownloaded)
11165           gnus-undownloaded-mark)
11166          (gnus-newsgroup-agentized
11167           gnus-downloaded-mark)
11168          (t
11169           gnus-no-mark))
11170    'download)
11171   (gnus-summary-update-line t)
11172   t)
11173
11174 (defun gnus-summary-update-mark (mark type)
11175   (let ((forward (cdr (assq type gnus-summary-mark-positions)))
11176         (inhibit-read-only t))
11177     (re-search-backward "[\n\r]" (point-at-bol) 'move-to-limit)
11178     (when forward
11179       (when (looking-at "\r")
11180         (incf forward))
11181       (when (<= (+ forward (point)) (point-max))
11182         ;; Go to the right position on the line.
11183         (goto-char (+ forward (point)))
11184         ;; Replace the old mark with the new mark.
11185         (let ((to-insert
11186                (mm-subst-char-in-string
11187                 (char-after) mark
11188                 (buffer-substring (point) (1+ (point))))))
11189           (delete-region (point) (1+ (point)))
11190           (insert to-insert))
11191         ;; Optionally update the marks by some user rule.
11192         (when (eq type 'unread)
11193           (gnus-data-set-mark
11194            (gnus-data-find (gnus-summary-article-number)) mark)
11195           (gnus-summary-update-line (eq mark gnus-unread-mark)))))))
11196
11197 (defun gnus-mark-article-as-read (article &optional mark)
11198   "Enter ARTICLE in the pertinent lists and remove it from others."
11199   ;; Make the article expirable.
11200   (let ((mark (or mark gnus-del-mark)))
11201     (setq gnus-newsgroup-expirable
11202           (if (= mark gnus-expirable-mark)
11203               (gnus-add-to-sorted-list gnus-newsgroup-expirable article)
11204             (delq article gnus-newsgroup-expirable)))
11205     ;; Remove from unread and marked lists.
11206     (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
11207     (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
11208     (setq gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked))
11209     (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
11210     (push (cons article mark) gnus-newsgroup-reads)
11211     ;; Possibly remove from cache, if that is used.
11212     (when gnus-use-cache
11213       (gnus-cache-enter-remove-article article))
11214     t))
11215
11216 (defun gnus-mark-article-as-unread (article &optional mark)
11217   "Enter ARTICLE in the pertinent lists and remove it from others."
11218   (let ((mark (or mark gnus-ticked-mark)))
11219     (if (<= article 0)
11220         (progn
11221           (gnus-error 1 "Can't mark negative article numbers")
11222           nil)
11223       (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked)
11224             gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked)
11225             gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant)
11226             gnus-newsgroup-expirable (delq article gnus-newsgroup-expirable)
11227             gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
11228
11229       ;; Unsuppress duplicates?
11230       (when gnus-suppress-duplicates
11231         (gnus-dup-unsuppress-article article))
11232
11233       (cond ((= mark gnus-ticked-mark)
11234              (setq gnus-newsgroup-marked
11235                    (gnus-add-to-sorted-list gnus-newsgroup-marked article)))
11236             ((= mark gnus-spam-mark)
11237              (setq gnus-newsgroup-spam-marked
11238                    (gnus-add-to-sorted-list gnus-newsgroup-spam-marked
11239                                             article)))
11240             ((= mark gnus-dormant-mark)
11241              (setq gnus-newsgroup-dormant
11242                    (gnus-add-to-sorted-list gnus-newsgroup-dormant article)))
11243             (t
11244              (setq gnus-newsgroup-unreads
11245                    (gnus-add-to-sorted-list gnus-newsgroup-unreads article))))
11246       (gnus-alist-pull article gnus-newsgroup-reads)
11247       t)))
11248
11249 (defun gnus-summary-tick-article-forward (n)
11250   "Tick N articles forwards.
11251 If N is negative, tick backwards instead.
11252 The difference between N and the number of articles ticked is returned."
11253   (interactive "p")
11254   (gnus-summary-mark-forward n gnus-ticked-mark))
11255
11256 (defun gnus-summary-tick-article-backward (n)
11257   "Tick N articles backwards.
11258 The difference between N and the number of articles ticked is returned."
11259   (interactive "p")
11260   (gnus-summary-mark-forward (- n) gnus-ticked-mark))
11261
11262 (defun gnus-summary-tick-article (&optional article clear-mark)
11263   "Mark current article as unread.
11264 Optional 1st argument ARTICLE specifies article number to be marked as unread.
11265 Optional 2nd argument CLEAR-MARK remove any kinds of mark."
11266   (interactive)
11267   (gnus-summary-mark-article article (if clear-mark gnus-unread-mark
11268                                        gnus-ticked-mark)))
11269
11270 (defun gnus-summary-mark-as-read-forward (n)
11271   "Mark N articles as read forwards.
11272 If N is negative, mark backwards instead.
11273 The difference between N and the actual number of articles marked is
11274 returned."
11275   (interactive "p")
11276   (gnus-summary-mark-forward n gnus-del-mark gnus-inhibit-user-auto-expire))
11277
11278 (defun gnus-summary-mark-as-read-backward (n)
11279   "Mark the N articles as read backwards.
11280 The difference between N and the actual number of articles marked is
11281 returned."
11282   (interactive "p")
11283   (gnus-summary-mark-forward
11284    (- n) gnus-del-mark gnus-inhibit-user-auto-expire))
11285
11286 (defun gnus-summary-mark-as-read (&optional article mark)
11287   "Mark current article as read.
11288 ARTICLE specifies the article to be marked as read.
11289 MARK specifies a string to be inserted at the beginning of the line."
11290   (gnus-summary-mark-article article mark))
11291
11292 (defun gnus-summary-clear-mark-forward (n)
11293   "Clear marks from N articles forward.
11294 If N is negative, clear backward instead.
11295 The difference between N and the number of marks cleared is returned."
11296   (interactive "p")
11297   (gnus-summary-mark-forward n gnus-unread-mark))
11298
11299 (defun gnus-summary-clear-mark-backward (n)
11300   "Clear marks from N articles backward.
11301 The difference between N and the number of marks cleared is returned."
11302   (interactive "p")
11303   (gnus-summary-mark-forward (- n) gnus-unread-mark))
11304
11305 (defun gnus-summary-mark-unread-as-read ()
11306   "Intended to be used by `gnus-mark-article-hook'."
11307   (when (memq gnus-current-article gnus-newsgroup-unreads)
11308     (gnus-summary-mark-article gnus-current-article gnus-read-mark)))
11309
11310 (defun gnus-summary-mark-read-and-unread-as-read (&optional new-mark)
11311   "Intended to be used by `gnus-mark-article-hook'."
11312   (let ((mark (gnus-summary-article-mark)))
11313     (when (or (gnus-unread-mark-p mark)
11314               (gnus-read-mark-p mark))
11315       (gnus-summary-mark-article gnus-current-article
11316                                  (or new-mark gnus-read-mark)))))
11317
11318 (defun gnus-summary-mark-current-read-and-unread-as-read (&optional new-mark)
11319   "Intended to be used by `gnus-mark-article-hook'."
11320   (let ((mark (gnus-summary-article-mark)))
11321     (when (or (gnus-unread-mark-p mark)
11322               (gnus-read-mark-p mark))
11323       (gnus-summary-mark-article (gnus-summary-article-number)
11324                                  (or new-mark gnus-read-mark)))))
11325
11326 (defun gnus-summary-mark-unread-as-ticked ()
11327   "Intended to be used by `gnus-mark-article-hook'."
11328   (when (memq gnus-current-article gnus-newsgroup-unreads)
11329     (gnus-summary-mark-article gnus-current-article gnus-ticked-mark)))
11330
11331 (defun gnus-summary-mark-region-as-read (point mark all)
11332   "Mark all unread articles between point and mark as read.
11333 If given a prefix, mark all articles between point and mark as read,
11334 even ticked and dormant ones."
11335   (interactive "r\nP")
11336   (save-excursion
11337     (let (article)
11338       (goto-char point)
11339       (beginning-of-line)
11340       (while (and
11341               (< (point) mark)
11342               (progn
11343                 (when (or all
11344                           (memq (setq article (gnus-summary-article-number))
11345                                 gnus-newsgroup-unreads))
11346                   (gnus-summary-mark-article article gnus-del-mark))
11347                 t)
11348               (gnus-summary-find-next))))))
11349
11350 (defun gnus-summary-mark-below (score mark)
11351   "Mark articles with score less than SCORE with MARK."
11352   (interactive "P\ncMark: ")
11353   (setq score (if score
11354                   (prefix-numeric-value score)
11355                 (or gnus-summary-default-score 0)))
11356   (with-current-buffer gnus-summary-buffer
11357     (goto-char (point-min))
11358     (while
11359         (progn
11360           (and (< (gnus-summary-article-score) score)
11361                (gnus-summary-mark-article nil mark))
11362           (gnus-summary-find-next)))))
11363
11364 (defun gnus-summary-kill-below (&optional score)
11365   "Mark articles with score below SCORE as read."
11366   (interactive "P")
11367   (gnus-summary-mark-below score gnus-killed-mark))
11368
11369 (defun gnus-summary-clear-above (&optional score)
11370   "Clear all marks from articles with score above SCORE."
11371   (interactive "P")
11372   (gnus-summary-mark-above score gnus-unread-mark))
11373
11374 (defun gnus-summary-tick-above (&optional score)
11375   "Tick all articles with score above SCORE."
11376   (interactive "P")
11377   (gnus-summary-mark-above score gnus-ticked-mark))
11378
11379 (defun gnus-summary-mark-above (score mark)
11380   "Mark articles with score over SCORE with MARK."
11381   (interactive "P\ncMark: ")
11382   (setq score (if score
11383                   (prefix-numeric-value score)
11384                 (or gnus-summary-default-score 0)))
11385   (with-current-buffer gnus-summary-buffer
11386     (goto-char (point-min))
11387     (while (and (progn
11388                   (when (> (gnus-summary-article-score) score)
11389                     (gnus-summary-mark-article nil mark))
11390                   t)
11391                 (gnus-summary-find-next)))))
11392
11393 ;; Suggested by Daniel Quinlan <quinlan@best.com>.
11394 (defalias 'gnus-summary-show-all-expunged 'gnus-summary-limit-include-expunged)
11395 (defun gnus-summary-limit-include-expunged (&optional no-error)
11396   "Display all the hidden articles that were expunged for low scores."
11397   (interactive)
11398   (let ((inhibit-read-only t))
11399     (let ((scored gnus-newsgroup-scored)
11400           headers h)
11401       (while scored
11402         (unless (gnus-summary-article-header (caar scored))
11403           (and (setq h (gnus-number-to-header (caar scored)))
11404                (< (cdar scored) gnus-summary-expunge-below)
11405                (push h headers)))
11406         (setq scored (cdr scored)))
11407       (if (not headers)
11408           (when (not no-error)
11409             (error "No expunged articles hidden"))
11410         (goto-char (point-min))
11411         (push gnus-newsgroup-limit gnus-newsgroup-limits)
11412         (setq gnus-newsgroup-limit (copy-sequence gnus-newsgroup-limit))
11413         (dolist (x headers)
11414           (push (mail-header-number x) gnus-newsgroup-limit))
11415         (gnus-summary-prepare-unthreaded (nreverse headers))
11416         (goto-char (point-min))
11417         (gnus-summary-position-point)
11418         t))))
11419
11420 (defun gnus-summary-catchup (&optional all quietly to-here not-mark reverse)
11421   "Mark all unread articles in this newsgroup as read.
11422 If prefix argument ALL is non-nil, ticked and dormant articles will
11423 also be marked as read.
11424 If QUIETLY is non-nil, no questions will be asked.
11425
11426 If TO-HERE is non-nil, it should be a point in the buffer.  All
11427 articles before (after, if REVERSE is set) this point will be marked
11428 as read.
11429
11430 Note that this function will only catch up the unread article
11431 in the current summary buffer limitation.
11432
11433 The number of articles marked as read is returned."
11434   (interactive "P")
11435   (prog1
11436       (save-excursion
11437         (when (or quietly
11438                   (not gnus-interactive-catchup) ;Without confirmation?
11439                   gnus-expert-user
11440                   (gnus-y-or-n-p
11441                    (if all
11442                        "Mark absolutely all articles as read? "
11443                      "Mark all unread articles as read? ")))
11444           (if (and not-mark
11445                    (not gnus-newsgroup-adaptive)
11446                    (not gnus-newsgroup-auto-expire)
11447                    (not gnus-suppress-duplicates)
11448                    (or (not gnus-use-cache)
11449                        (eq gnus-use-cache 'passive)))
11450               (progn
11451                 (when all
11452                   (setq gnus-newsgroup-marked nil
11453                         gnus-newsgroup-spam-marked nil
11454                         gnus-newsgroup-dormant nil))
11455                 (setq gnus-newsgroup-unreads
11456                       (gnus-sorted-nunion
11457                        (gnus-sorted-intersection gnus-newsgroup-unreads
11458                                                  gnus-newsgroup-downloadable)
11459                        (gnus-sorted-difference gnus-newsgroup-unfetched
11460                                                gnus-newsgroup-cached))))
11461             ;; We actually mark all articles as canceled, which we
11462             ;; have to do when using auto-expiry or adaptive scoring.
11463             (gnus-summary-show-all-threads)
11464             (if (and to-here reverse)
11465                 (progn
11466                   (goto-char to-here)
11467                   (gnus-summary-mark-current-read-and-unread-as-read
11468                    gnus-catchup-mark)
11469                   (while (gnus-summary-find-next (not all))
11470                     (gnus-summary-mark-article-as-read gnus-catchup-mark)))
11471               (when (gnus-summary-first-subject (not all))
11472                 (while (and
11473                         (if to-here (< (point) to-here) t)
11474                         (gnus-summary-mark-article-as-read gnus-catchup-mark)
11475                         (gnus-summary-find-next (not all))))))
11476             (gnus-set-mode-line 'summary))
11477           t))
11478     (gnus-summary-position-point)))
11479
11480 (defun gnus-summary-catchup-to-here (&optional all)
11481   "Mark all unticked articles before the current one as read.
11482 If ALL is non-nil, also mark ticked and dormant articles as read."
11483   (interactive "P")
11484   (save-excursion
11485     (gnus-save-hidden-threads
11486       (let ((beg (point)))
11487         ;; We check that there are unread articles.
11488         (when (or all (gnus-summary-find-prev))
11489           (gnus-summary-catchup all t beg)))))
11490   (gnus-summary-position-point))
11491
11492 (defun gnus-summary-catchup-from-here (&optional all)
11493   "Mark all unticked articles after (and including) the current one as read.
11494 If ALL is non-nil, also mark ticked and dormant articles as read."
11495   (interactive "P")
11496   (save-excursion
11497     (gnus-save-hidden-threads
11498       (let ((beg (point)))
11499         ;; We check that there are unread articles.
11500         (when (or all (gnus-summary-find-next))
11501           (gnus-summary-catchup all t beg nil t)))))
11502   (gnus-summary-position-point))
11503
11504 (defun gnus-summary-catchup-all (&optional quietly)
11505   "Mark all articles in this newsgroup as read.
11506 This command is dangerous.  Normally, you want \\[gnus-summary-catchup]
11507 instead, which marks only unread articles as read."
11508   (interactive "P")
11509   (gnus-summary-catchup t quietly))
11510
11511 (defun gnus-summary-catchup-and-exit (&optional all quietly)
11512   "Mark all unread articles in this group as read, then exit.
11513 If prefix argument ALL is non-nil, all articles are marked as read.
11514 If QUIETLY is non-nil, no questions will be asked."
11515   (interactive "P")
11516   (when (gnus-summary-catchup all quietly nil 'fast)
11517     ;; Select next newsgroup or exit.
11518     (if (and (not (gnus-group-quit-config gnus-newsgroup-name))
11519              (eq gnus-auto-select-next 'quietly))
11520         (gnus-summary-next-group nil)
11521       (gnus-summary-exit))))
11522
11523 (defun gnus-summary-catchup-all-and-exit (&optional quietly)
11524   "Mark all articles in this newsgroup as read, and then exit.
11525 This command is dangerous.  Normally, you want \\[gnus-summary-catchup-and-exit]
11526 instead, which marks only unread articles as read."
11527   (interactive "P")
11528   (gnus-summary-catchup-and-exit t quietly))
11529
11530 (defun gnus-summary-catchup-and-goto-next-group (&optional all)
11531   "Mark all articles in this group as read and select the next group.
11532 If given a prefix, mark all articles, unread as well as ticked, as
11533 read."
11534   (interactive "P")
11535   (save-excursion
11536     (gnus-summary-catchup all))
11537   (gnus-summary-next-group))
11538
11539 (defun gnus-summary-catchup-and-goto-prev-group (&optional all)
11540   "Mark all articles in this group as read and select the previous group.
11541 If given a prefix, mark all articles, unread as well as ticked, as
11542 read."
11543   (interactive "P")
11544   (save-excursion
11545     (gnus-summary-catchup all))
11546   (gnus-summary-next-group nil nil t))
11547
11548 ;;;
11549 ;;; with article
11550 ;;;
11551
11552 (defmacro gnus-with-article (article &rest forms)
11553   "Select ARTICLE and perform FORMS in the original article buffer.
11554 Then replace the article with the result."
11555   `(progn
11556      ;; We don't want the article to be marked as read.
11557      (let (gnus-mark-article-hook)
11558        (gnus-summary-select-article t t nil ,article))
11559      (set-buffer gnus-original-article-buffer)
11560      ,@forms
11561      (if (not (gnus-check-backend-function
11562                'request-replace-article (car gnus-article-current)))
11563          (gnus-message 5 "Read-only group; not replacing")
11564        (unless (gnus-request-replace-article
11565                 ,article (car gnus-article-current)
11566                 (current-buffer) t)
11567          (error "Couldn't replace article")))
11568      ;; The cache and backlog have to be flushed somewhat.
11569      (when gnus-keep-backlog
11570        (gnus-backlog-remove-article
11571         (car gnus-article-current) (cdr gnus-article-current)))
11572      (when gnus-use-cache
11573        (gnus-cache-update-article
11574         (car gnus-article-current) (cdr gnus-article-current)))))
11575
11576 (put 'gnus-with-article 'lisp-indent-function 1)
11577 (put 'gnus-with-article 'edebug-form-spec '(form body))
11578
11579 ;; Thread-based commands.
11580
11581 (defun gnus-summary-articles-in-thread (&optional article)
11582   "Return a list of all articles in the current thread.
11583 If ARTICLE is non-nil, return all articles in the thread that starts
11584 with that article."
11585   (let* ((article (or article (gnus-summary-article-number)))
11586          (data (gnus-data-find-list article))
11587          (top-level (gnus-data-level (car data)))
11588          (top-subject
11589           (cond ((null gnus-thread-operation-ignore-subject)
11590                  (gnus-simplify-subject-re
11591                   (mail-header-subject (gnus-data-header (car data)))))
11592                 ((eq gnus-thread-operation-ignore-subject 'fuzzy)
11593                  (gnus-simplify-subject-fuzzy
11594                   (mail-header-subject (gnus-data-header (car data)))))
11595                 (t nil)))
11596          (end-point (save-excursion
11597                       (goto-char (gnus-data-pos (car data)))
11598                       (if (gnus-summary-go-to-next-thread)
11599                           (point) (point-max))))
11600          articles)
11601     (while (and data
11602                 (< (gnus-data-pos (car data)) end-point))
11603       (when (or (not top-subject)
11604                 (string= top-subject
11605                          (if (eq gnus-thread-operation-ignore-subject 'fuzzy)
11606                              (gnus-simplify-subject-fuzzy
11607                               (mail-header-subject
11608                                (gnus-data-header (car data))))
11609                            (gnus-simplify-subject-re
11610                             (mail-header-subject
11611                              (gnus-data-header (car data)))))))
11612         (push (gnus-data-number (car data)) articles))
11613       (unless (and (setq data (cdr data))
11614                    (> (gnus-data-level (car data)) top-level))
11615         (setq data nil)))
11616     ;; Return the list of articles.
11617     (nreverse articles)))
11618
11619 (defun gnus-summary-rethread-current ()
11620   "Rethread the thread the current article is part of."
11621   (interactive)
11622   (let* ((gnus-show-threads t)
11623          (article (gnus-summary-article-number))
11624          (id (mail-header-id (gnus-summary-article-header)))
11625          (gnus-newsgroup-threads (list (gnus-id-to-thread (gnus-root-id id)))))
11626     (unless id
11627       (error "No article on the current line"))
11628     (gnus-rebuild-thread id)
11629     (gnus-summary-goto-subject article)))
11630
11631 (defun gnus-summary-reparent-thread ()
11632   "Make the current article child of the marked (or previous) article.
11633
11634 Note that the re-threading will only work if `gnus-thread-ignore-subject'
11635 is non-nil or the Subject: of both articles are the same."
11636   (interactive)
11637   (unless (not (gnus-group-read-only-p))
11638     (error "The current newsgroup does not support article editing"))
11639   (unless (<= (length gnus-newsgroup-processable) 1)
11640     (error "No more than one article may be marked"))
11641   (let ((child (gnus-summary-article-number))
11642         ;; First grab the marked article, otherwise one line up.
11643         (parent (if (not (null gnus-newsgroup-processable))
11644                     (car gnus-newsgroup-processable)
11645                   (save-excursion
11646                     (if (eq (forward-line -1) 0)
11647                         (gnus-summary-article-number)
11648                       (error "Beginning of summary buffer"))))))
11649     (gnus-summary-reparent-children parent (list child))))
11650
11651 (defun gnus-summary-reparent-children (parent children)
11652   "Make PARENT the parent of CHILDREN.
11653 When called interactively, PARENT is the current article and CHILDREN
11654 are the process-marked articles."
11655   (interactive
11656    (list (gnus-summary-article-number)
11657          (gnus-summary-work-articles nil)))
11658   (dolist (child children)
11659     (save-window-excursion
11660       (let ((gnus-article-buffer " *reparent*"))
11661         (unless (not (eq parent child))
11662           (error "An article may not be self-referential"))
11663         (let ((message-id (mail-header-id
11664                            (gnus-summary-article-header parent))))
11665           (unless (and message-id (not (equal message-id "")))
11666             (error "No message-id in desired parent"))
11667           (gnus-with-article child
11668             (save-restriction
11669               (goto-char (point-min))
11670               (message-narrow-to-head)
11671               (if (re-search-forward "^References: " nil t)
11672                   (progn
11673                     (re-search-forward "^[^ \t]" nil t)
11674                     (forward-line -1)
11675                     (end-of-line)
11676                     (insert " " message-id))
11677                 (insert "References: " message-id "\n"))))
11678           (set-buffer gnus-summary-buffer)
11679           (gnus-summary-unmark-all-processable)
11680           (gnus-summary-update-article child)
11681           (when (gnus-summary-goto-subject (cdr gnus-article-current) nil t)
11682             (gnus-summary-update-secondary-mark (cdr gnus-article-current)))
11683           (gnus-summary-rethread-current)
11684           (gnus-message 3 "Article %d is now the child of article %d"
11685                         child parent))))))
11686
11687 (defun gnus-summary-toggle-threads (&optional arg)
11688   "Toggle showing conversation threads.
11689 If ARG is positive number, turn showing conversation threads on."
11690   (interactive "P")
11691   (let ((current (or (gnus-summary-article-number) gnus-newsgroup-end)))
11692     (setq gnus-show-threads
11693           (if (null arg) (not gnus-show-threads)
11694             (> (prefix-numeric-value arg) 0)))
11695     (gnus-summary-prepare)
11696     (gnus-summary-goto-subject current)
11697     (gnus-message 6 "Threading is now %s" (if gnus-show-threads "on" "off"))
11698     (gnus-summary-position-point)))
11699
11700 (defun gnus-summary-show-all-threads ()
11701   "Show all threads."
11702   (interactive)
11703   (remove-overlays (point-min) (point-max) 'invisible 'gnus-sum)
11704   (gnus-summary-position-point))
11705
11706 (defsubst gnus-summary--inv (p)
11707   (and (eq (get-char-property p 'invisible) 'gnus-sum) p))
11708
11709 (defun gnus-summary-show-thread ()
11710   "Show thread subtrees.
11711 Returns nil if no thread was there to be shown."
11712   (interactive)
11713   (let* ((orig (point))
11714          (end (point-at-eol))
11715          (end (or (gnus-summary--inv end) (gnus-summary--inv (1- end))))
11716          ;; Leave point at bol
11717          (beg (progn (beginning-of-line) (if (bobp) (point) (1- (point)))))
11718          (eoi (when end
11719                 (if (fboundp 'next-single-char-property-change)
11720                     ;; Note: XEmacs version of n-s-c-p-c may return nil
11721                     (or (next-single-char-property-change end 'invisible)
11722                         (point-max))
11723                   (while (progn
11724                            (end-of-line 2)
11725                            (and (not (eobp))
11726                                 (eq (get-char-property (point) 'invisible)
11727                                     'gnus-sum))))
11728                   (point)))))
11729     (when eoi
11730       (remove-overlays beg eoi 'invisible 'gnus-sum)
11731       (goto-char orig)
11732       (gnus-summary-position-point)
11733       eoi)))
11734
11735 (defun gnus-summary-maybe-hide-threads ()
11736   "If requested, hide the threads that should be hidden."
11737   (when (and gnus-show-threads
11738              gnus-thread-hide-subtree)
11739     (gnus-summary-hide-all-threads
11740      (if (or (consp gnus-thread-hide-subtree)
11741              (functionp gnus-thread-hide-subtree))
11742          (gnus-make-predicate gnus-thread-hide-subtree)
11743        nil))))
11744
11745 ;;; Hiding predicates.
11746
11747 (defun gnus-article-unread-p (header)
11748   (memq (mail-header-number header) gnus-newsgroup-unreads))
11749
11750 (defun gnus-article-unseen-p (header)
11751   (memq (mail-header-number header) gnus-newsgroup-unseen))
11752
11753 (defun gnus-map-articles (predicate articles)
11754   "Map PREDICATE over ARTICLES and return non-nil if any predicate is non-nil."
11755   (apply 'gnus-or (mapcar predicate
11756                           (mapcar (lambda (number)
11757                                     (gnus-summary-article-header number))
11758                                   articles))))
11759
11760 (defun gnus-summary-hide-all-threads (&optional predicate)
11761   "Hide all thread subtrees.
11762 If PREDICATE is supplied, threads that satisfy this predicate
11763 will not be hidden."
11764   (interactive)
11765   (save-excursion
11766     (goto-char (point-min))
11767     (let ((end nil)
11768           (count 0))
11769       (while (not end)
11770         (incf count)
11771         (when (zerop (mod count 1000))
11772           (message "Hiding all threads... %d" count))
11773         (when (or (not predicate)
11774                   (gnus-map-articles
11775                    predicate (gnus-summary-article-children)))
11776             (gnus-summary-hide-thread))
11777         (setq end (not (zerop (gnus-summary-next-thread 1 t)))))))
11778   (gnus-summary-position-point))
11779
11780 (defun gnus-summary-hide-thread ()
11781   "Hide thread subtrees.
11782 If PREDICATE is supplied, threads that satisfy this predicate
11783 will not be hidden.
11784 Returns nil if no threads were there to be hidden."
11785   (interactive)
11786   (beginning-of-line)
11787   (let ((start (point))
11788         (starteol (line-end-position))
11789         (article (gnus-summary-article-number)))
11790     ;; Go forward until either the buffer ends or the subthread ends.
11791     (when (and (not (eobp))
11792                (or (zerop (gnus-summary-next-thread 1 t))
11793                    (goto-char (point-max))))
11794       (if (and (> (point) start)
11795                ;; FIXME: this should actually search for a non-invisible \n.
11796                (search-backward "\n" start t))
11797           (progn
11798             (when (> (point) starteol)
11799               (remove-overlays starteol (point) 'invisible 'gnus-sum)
11800               (let ((ol (make-overlay starteol (point) nil t nil)))
11801                 (overlay-put ol 'invisible 'gnus-sum)
11802                 (overlay-put ol 'evaporate t)))
11803             (gnus-summary-goto-subject article)
11804             (when (> start (point))
11805               (message "Hiding the thread moved us backwards, aborting!")
11806               (goto-char (point-max))))
11807         (goto-char start)
11808         nil))))
11809
11810 (defun gnus-summary-go-to-next-thread (&optional previous)
11811   "Go to the same level (or less) next thread.
11812 If PREVIOUS is non-nil, go to previous thread instead.
11813 Return the article number moved to, or nil if moving was impossible."
11814   (let ((level (gnus-summary-thread-level))
11815         (way (if previous -1 1))
11816         (beg (point)))
11817     (forward-line way)
11818     (while (and (not (eobp))
11819                 (< level (gnus-summary-thread-level)))
11820       (forward-line way))
11821     (if (eobp)
11822         (progn
11823           (goto-char beg)
11824           nil)
11825       (setq beg (point))
11826       (prog1
11827           (gnus-summary-article-number)
11828         (goto-char beg)))))
11829
11830 (defun gnus-summary-next-thread (n &optional silent)
11831   "Go to the same level next N'th thread.
11832 If N is negative, search backward instead.
11833 Returns the difference between N and the number of skips actually
11834 done.
11835
11836 If SILENT, don't output messages."
11837   (interactive "p")
11838   (let ((backward (< n 0))
11839         (n (abs n)))
11840     (while (and (> n 0)
11841                 (gnus-summary-go-to-next-thread backward))
11842       (decf n))
11843     (unless silent
11844       (gnus-summary-position-point))
11845     (when (and (not silent) (/= 0 n))
11846       (gnus-message 7 "No more threads"))
11847     n))
11848
11849 (defun gnus-summary-prev-thread (n)
11850   "Go to the same level previous N'th thread.
11851 Returns the difference between N and the number of skips actually
11852 done."
11853   (interactive "p")
11854   (gnus-summary-next-thread (- n)))
11855
11856 (defun gnus-summary-go-down-thread ()
11857   "Go down one level in the current thread."
11858   (let ((children (gnus-summary-article-children)))
11859     (when children
11860       (gnus-summary-goto-subject (car children)))))
11861
11862 (defun gnus-summary-go-up-thread ()
11863   "Go up one level in the current thread."
11864   (let ((parent (gnus-summary-article-parent)))
11865     (when parent
11866       (gnus-summary-goto-subject parent))))
11867
11868 (defun gnus-summary-down-thread (n)
11869   "Go down thread N steps.
11870 If N is negative, go up instead.
11871 Returns the difference between N and how many steps down that were
11872 taken."
11873   (interactive "p")
11874   (let ((up (< n 0))
11875         (n (abs n)))
11876     (while (and (> n 0)
11877                 (if up (gnus-summary-go-up-thread)
11878                   (gnus-summary-go-down-thread)))
11879       (setq n (1- n)))
11880     (gnus-summary-position-point)
11881     (when (/= 0 n)
11882       (gnus-message 7 "Can't go further"))
11883     n))
11884
11885 (defun gnus-summary-up-thread (n)
11886   "Go up thread N steps.
11887 If N is negative, go down instead.
11888 Returns the difference between N and how many steps down that were
11889 taken."
11890   (interactive "p")
11891   (gnus-summary-down-thread (- n)))
11892
11893 (defun gnus-summary-top-thread ()
11894   "Go to the top of the thread."
11895   (interactive)
11896   (while (gnus-summary-go-up-thread))
11897   (gnus-summary-article-number))
11898
11899 (defun gnus-summary-expire-thread ()
11900   "Mark articles under current thread as expired."
11901   (interactive)
11902   (gnus-summary-kill-thread 0))
11903
11904 (defun gnus-summary-kill-thread (&optional unmark)
11905   "Mark articles under current thread as read.
11906 If the prefix argument is positive, remove any kinds of marks.
11907 If the prefix argument is zero, mark thread as expired.
11908 If the prefix argument is negative, tick articles instead."
11909   (interactive "P")
11910   (when unmark
11911     (setq unmark (prefix-numeric-value unmark)))
11912   (let ((articles (gnus-summary-articles-in-thread))
11913         (hide (or (null unmark) (= unmark 0))))
11914     (save-excursion
11915       ;; Expand the thread.
11916       (gnus-summary-show-thread)
11917       ;; Mark all the articles.
11918       (while articles
11919         (gnus-summary-goto-subject (car articles))
11920         (cond ((null unmark)
11921                (gnus-summary-mark-article-as-read gnus-killed-mark))
11922               ((> unmark 0)
11923                (gnus-summary-mark-article-as-unread gnus-unread-mark))
11924               ((= unmark 0)
11925                (gnus-summary-mark-article nil gnus-expirable-mark))
11926               (t
11927                (gnus-summary-mark-article-as-unread gnus-ticked-mark)))
11928         (setq articles (cdr articles))))
11929     ;; Hide killed subtrees when hide is true.
11930     (and hide
11931          gnus-thread-hide-killed
11932          (gnus-summary-hide-thread))
11933     ;; If hide is t, go to next unread subject.
11934     (when hide
11935       ;; Go to next unread subject.
11936       (gnus-summary-next-subject 1 t)))
11937   (gnus-set-mode-line 'summary))
11938
11939 ;; Summary sorting commands
11940
11941 (defun gnus-summary-sort-by-number (&optional reverse)
11942   "Sort the summary buffer by article number.
11943 Argument REVERSE means reverse order."
11944   (interactive "P")
11945   (gnus-summary-sort 'number reverse))
11946
11947 (defun gnus-summary-sort-by-most-recent-number (&optional reverse)
11948   "Sort the summary buffer by most recent article number.
11949 Argument REVERSE means reverse order."
11950   (interactive "P")
11951   (gnus-summary-sort 'most-recent-number reverse))
11952
11953 (defun gnus-summary-sort-by-random (&optional reverse)
11954   "Randomize the order in the summary buffer.
11955 Argument REVERSE means to randomize in reverse order."
11956   (interactive "P")
11957   (gnus-summary-sort 'random reverse))
11958
11959 (defun gnus-summary-sort-by-author (&optional reverse)
11960   "Sort the summary buffer by author name alphabetically.
11961 If `case-fold-search' is non-nil, case of letters is ignored.
11962 Argument REVERSE means reverse order."
11963   (interactive "P")
11964   (gnus-summary-sort 'author reverse))
11965
11966 (defun gnus-summary-sort-by-recipient (&optional reverse)
11967   "Sort the summary buffer by recipient name alphabetically.
11968 If `case-fold-search' is non-nil, case of letters is ignored.
11969 Argument REVERSE means reverse order."
11970   (interactive "P")
11971   (gnus-summary-sort 'recipient reverse))
11972
11973 (defun gnus-summary-sort-by-subject (&optional reverse)
11974   "Sort the summary buffer by subject alphabetically.  `Re:'s are ignored.
11975 If `case-fold-search' is non-nil, case of letters is ignored.
11976 Argument REVERSE means reverse order."
11977   (interactive "P")
11978   (gnus-summary-sort 'subject reverse))
11979
11980 (defun gnus-summary-sort-by-date (&optional reverse)
11981   "Sort the summary buffer by date.
11982 Argument REVERSE means reverse order."
11983   (interactive "P")
11984   (gnus-summary-sort 'date reverse))
11985
11986 (defun gnus-summary-sort-by-most-recent-date (&optional reverse)
11987   "Sort the summary buffer by most recent date.
11988 Argument REVERSE means reverse order."
11989   (interactive "P")
11990   (gnus-summary-sort 'most-recent-date reverse))
11991
11992 (defun gnus-summary-sort-by-score (&optional reverse)
11993   "Sort the summary buffer by score.
11994 Argument REVERSE means reverse order."
11995   (interactive "P")
11996   (gnus-summary-sort 'score reverse))
11997
11998 (defun gnus-summary-sort-by-lines (&optional reverse)
11999   "Sort the summary buffer by the number of lines.
12000 Argument REVERSE means reverse order."
12001   (interactive "P")
12002   (gnus-summary-sort 'lines reverse))
12003
12004 (defun gnus-summary-sort-by-chars (&optional reverse)
12005   "Sort the summary buffer by article length.
12006 Argument REVERSE means reverse order."
12007   (interactive "P")
12008   (gnus-summary-sort 'chars reverse))
12009
12010 (defun gnus-summary-sort-by-original (&optional reverse)
12011   "Sort the summary buffer using the default sorting method.
12012 Argument REVERSE means reverse order."
12013   (interactive "P")
12014   (let* ((inhibit-read-only t)
12015          (gnus-summary-prepare-hook nil))
12016     ;; We do the sorting by regenerating the threads.
12017     (gnus-summary-prepare)
12018     ;; Hide subthreads if needed.
12019     (gnus-summary-maybe-hide-threads)))
12020
12021 (defun gnus-summary-sort (predicate reverse)
12022   "Sort summary buffer by PREDICATE.  REVERSE means reverse order."
12023   (let* ((thread (intern (format "gnus-thread-sort-by-%s" predicate)))
12024          (article (intern (format "gnus-article-sort-by-%s" predicate)))
12025          (gnus-thread-sort-functions
12026           (if (not reverse)
12027               thread
12028             `(lambda (t1 t2)
12029                (,thread t2 t1))))
12030          (gnus-sort-gathered-threads-function
12031           gnus-thread-sort-functions)
12032          (gnus-article-sort-functions
12033           (if (not reverse)
12034               article
12035             `(lambda (t1 t2)
12036                (,article t2 t1))))
12037          (inhibit-read-only t)
12038          (gnus-summary-prepare-hook nil))
12039     ;; We do the sorting by regenerating the threads.
12040     (gnus-summary-prepare)
12041     ;; Hide subthreads if needed.
12042     (gnus-summary-maybe-hide-threads)))
12043
12044 ;; Summary saving commands.
12045
12046 (defun gnus-summary-save-article (&optional n not-saved)
12047   "Save the current article using the default saver function.
12048 If N is a positive number, save the N next articles.
12049 If N is a negative number, save the N previous articles.
12050 If N is nil and any articles have been marked with the process mark,
12051 save those articles instead.
12052 The variable `gnus-default-article-saver' specifies the saver function.
12053
12054 If the optional second argument NOT-SAVED is non-nil, articles saved
12055 will not be marked as saved."
12056   (interactive "P")
12057   (require 'gnus-art)
12058   (let* ((articles (gnus-summary-work-articles n))
12059          (save-buffer (save-excursion
12060                         (nnheader-set-temp-buffer " *Gnus Save*")))
12061          (num (length articles))
12062          ;; Whether to save decoded articles or raw articles.
12063          (decode (when gnus-article-save-coding-system
12064                    (get gnus-default-article-saver :decode)))
12065          ;; When saving many articles in a single file, use the other
12066          ;; function to save articles other than the first one.
12067          (saver2 (get gnus-default-article-saver :function))
12068          (gnus-prompt-before-saving (if saver2
12069                                         t
12070                                       gnus-prompt-before-saving))
12071          (gnus-default-article-saver gnus-default-article-saver)
12072          header file)
12073     (dolist (article articles)
12074       (setq header (gnus-summary-article-header article))
12075       (if (not (vectorp header))
12076           ;; This is a pseudo-article.
12077           (if (assq 'name header)
12078               (gnus-copy-file (cdr (assq 'name header)))
12079             (gnus-message 1 "Article %d is unsavable" article))
12080         ;; This is a real article.
12081         (save-window-excursion
12082           (gnus-summary-select-article decode decode nil article)
12083           (gnus-summary-goto-subject article))
12084         (with-current-buffer save-buffer
12085           (erase-buffer)
12086           (insert-buffer-substring (if decode
12087                                        gnus-article-buffer
12088                                      gnus-original-article-buffer)))
12089         (setq file (gnus-article-save save-buffer file num))
12090         (gnus-summary-remove-process-mark article)
12091         (unless not-saved
12092           (gnus-summary-set-saved-mark article)))
12093       (when saver2
12094         (setq gnus-default-article-saver saver2
12095               saver2 nil)))
12096     (gnus-kill-buffer save-buffer)
12097     (gnus-summary-position-point)
12098     (gnus-set-mode-line 'summary)
12099     n))
12100
12101 (declare-function gnus-summary-save-in-pipe "gnus-art" (&optional command raw))
12102
12103 (defun gnus-summary-pipe-output (&optional n sym)
12104   "Pipe the current article to a subprocess.
12105 If N is a positive number, pipe the N next articles.
12106 If N is a negative number, pipe the N previous articles.
12107 If N is nil and any articles have been marked with the process mark,
12108 pipe those articles instead.
12109 The default command to which articles are piped is specified by the
12110 variable `gnus-summary-pipe-output-default-command'; if it is nil, you
12111 will be prompted for the command.
12112
12113 The properties `:decode' and `:headers' that are put to the function
12114 symbol `gnus-summary-save-in-pipe' control whether this function
12115 decodes articles and what headers to keep (see the doc string for the
12116 `gnus-default-article-saver' variable).  If SYM (the symbolic prefix)
12117 is neither omitted nor the symbol `r', force including all headers
12118 regardless of the `:headers' property.  If it is the symbol `r',
12119 articles that are not decoded and include all headers will be piped
12120 no matter what the properties `:decode' and `:headers' are."
12121   (interactive (gnus-interactive "P\ny"))
12122   (require 'gnus-art)
12123   (let* ((articles (gnus-summary-work-articles n))
12124          (result-buffer "*Shell Command Output*")
12125          (all-headers (not (memq sym '(nil r))))
12126          (gnus-save-all-headers (or all-headers gnus-save-all-headers))
12127          (raw (eq sym 'r))
12128          (headers (get 'gnus-summary-save-in-pipe :headers))
12129          command result)
12130     (unless (numberp (car articles))
12131       (error "No article to pipe"))
12132     (setq command (gnus-read-shell-command
12133                    (concat "Shell command on "
12134                            (if (cdr articles)
12135                                (format "these %d articles" (length articles))
12136                              "this article")
12137                            ": ")
12138                    gnus-summary-pipe-output-default-command))
12139     (when (string-equal command "")
12140       (error "A command is required"))
12141     (when all-headers
12142       (put 'gnus-summary-save-in-pipe :headers nil))
12143     (unwind-protect
12144         (while articles
12145           (gnus-summary-goto-subject (pop articles))
12146           (save-window-excursion (gnus-summary-save-in-pipe command raw))
12147           (when (and (get-buffer result-buffer)
12148                      (not (zerop (buffer-size (get-buffer result-buffer)))))
12149             (setq result (concat result (with-current-buffer result-buffer
12150                                           (buffer-string))))))
12151       (put 'gnus-summary-save-in-pipe :headers headers))
12152     (unless (zerop (length result))
12153       (if (with-current-buffer (get-buffer-create result-buffer)
12154             (erase-buffer)
12155             (insert result)
12156             (prog1
12157                 (and (= (count-lines (point-min) (point)) 1)
12158                      (progn
12159                        (end-of-line 0)
12160                        (<= (current-column)
12161                            (window-width (minibuffer-window)))))
12162               (goto-char (point-min))))
12163           (message "%s" (substring result 0 -1))
12164         (message nil)
12165         (gnus-configure-windows 'pipe)))))
12166
12167 (defun gnus-summary-save-article-mail (&optional arg)
12168   "Append the current article to a Unix mail box file.
12169 If N is a positive number, save the N next articles.
12170 If N is a negative number, save the N previous articles.
12171 If N is nil and any articles have been marked with the process mark,
12172 save those articles instead."
12173   (interactive "P")
12174   (require 'gnus-art)
12175   (let ((gnus-default-article-saver 'gnus-summary-save-in-mail))
12176     (gnus-summary-save-article arg)))
12177
12178 (defun gnus-summary-save-article-rmail (&optional arg)
12179   "Append the current article to an rmail file.
12180 If N is a positive number, save the N next articles.
12181 If N is a negative number, save the N previous articles.
12182 If N is nil and any articles have been marked with the process mark,
12183 save those articles instead."
12184   (interactive "P")
12185   (require 'gnus-art)
12186   (let ((gnus-default-article-saver 'gnus-summary-save-in-rmail))
12187     (gnus-summary-save-article arg)))
12188
12189 (defun gnus-summary-save-article-file (&optional arg)
12190   "Append the current article to a file.
12191 If N is a positive number, save the N next articles.
12192 If N is a negative number, save the N previous articles.
12193 If N is nil and any articles have been marked with the process mark,
12194 save those articles instead."
12195   (interactive "P")
12196   (require 'gnus-art)
12197   (let ((gnus-default-article-saver 'gnus-summary-save-in-file))
12198     (gnus-summary-save-article arg)))
12199
12200 (defun gnus-summary-write-article-file (&optional arg)
12201   "Write the current article to a file, deleting the previous file.
12202 If N is a positive number, save the N next articles.
12203 If N is a negative number, save the N previous articles.
12204 If N is nil and any articles have been marked with the process mark,
12205 save those articles instead."
12206   (interactive "P")
12207   (require 'gnus-art)
12208   (let ((gnus-default-article-saver 'gnus-summary-write-to-file))
12209     (gnus-summary-save-article arg)))
12210
12211 (defun gnus-summary-save-article-body-file (&optional arg)
12212   "Append the current article body to a file.
12213 If N is a positive number, save the N next articles.
12214 If N is a negative number, save the N previous articles.
12215 If N is nil and any articles have been marked with the process mark,
12216 save those articles instead."
12217   (interactive "P")
12218   (require 'gnus-art)
12219   (let ((gnus-default-article-saver 'gnus-summary-save-body-in-file))
12220     (gnus-summary-save-article arg)))
12221
12222 (defun gnus-summary-write-article-body-file (&optional arg)
12223   "Write the current article body to a file, deleting the previous file.
12224 If N is a positive number, save the N next articles.
12225 If N is a negative number, save the N previous articles.
12226 If N is nil and any articles have been marked with the process mark,
12227 save those articles instead."
12228   (interactive "P")
12229   (require 'gnus-art)
12230   (let ((gnus-default-article-saver 'gnus-summary-write-body-to-file))
12231     (gnus-summary-save-article arg)))
12232
12233 (defun gnus-summary-muttprint (&optional arg)
12234   "Print the current article using Muttprint.
12235 If N is a positive number, save the N next articles.
12236 If N is a negative number, save the N previous articles.
12237 If N is nil and any articles have been marked with the process mark,
12238 save those articles instead."
12239   (interactive "P")
12240   (require 'gnus-art)
12241   (let ((gnus-default-article-saver 'gnus-summary-pipe-to-muttprint))
12242     (gnus-summary-save-article arg t)))
12243
12244 (defun gnus-summary-pipe-message (program)
12245   "Pipe the current article through PROGRAM."
12246   (interactive "sProgram: ")
12247   (gnus-summary-select-article)
12248   (let ((mail-header-separator ""))
12249     (gnus-eval-in-buffer-window gnus-article-buffer
12250       (save-restriction
12251         (widen)
12252         (let ((start (window-start))
12253               (inhibit-read-only t))
12254           (message-pipe-buffer-body program)
12255           (set-window-start (get-buffer-window (current-buffer)) start))))))
12256
12257 (defun gnus-get-split-value (methods)
12258   "Return a value based on the split METHODS."
12259   (let (split-name method result match)
12260     (when methods
12261       (with-current-buffer gnus-original-article-buffer
12262         (save-restriction
12263           (nnheader-narrow-to-headers)
12264           (while (and methods (not split-name))
12265             (goto-char (point-min))
12266             (setq method (pop methods))
12267             (setq match (car method))
12268             (when (cond
12269                    ((stringp match)
12270                     ;; Regular expression.
12271                     (ignore-errors
12272                       (re-search-forward match nil t)))
12273                    ((functionp match)
12274                     ;; Function.
12275                     (save-restriction
12276                       (widen)
12277                       (setq result (funcall match gnus-newsgroup-name))))
12278                    ((consp match)
12279                     ;; Form.
12280                     (save-restriction
12281                       (widen)
12282                       (setq result (eval match)))))
12283               (setq split-name (cdr method))
12284               (cond ((stringp result)
12285                      (push (expand-file-name
12286                             result gnus-article-save-directory)
12287                            split-name))
12288                     ((consp result)
12289                      (setq split-name (append result split-name)))))))))
12290     (nreverse split-name)))
12291
12292 (defun gnus-valid-move-group-p (group)
12293   (and (symbolp group)
12294        (boundp group)
12295        (symbol-name group)
12296        (symbol-value group)
12297        (gnus-get-function (gnus-find-method-for-group
12298                            (symbol-name group)) 'request-accept-article t)))
12299
12300 (defun gnus-read-move-group-name (prompt default articles prefix)
12301   "Read a group name."
12302   (let* ((split-name (gnus-get-split-value gnus-move-split-methods))
12303          (minibuffer-confirm-incomplete nil) ; XEmacs
12304          (prom
12305           (format "%s %s to"
12306                   prompt
12307                   (if (> (length articles) 1)
12308                       (format "these %d articles" (length articles))
12309                     "this article")))
12310          (to-newsgroup
12311           (cond
12312            ((null split-name)
12313             (gnus-group-completing-read
12314              prom
12315              (gnus-remove-if-not 'gnus-valid-move-group-p gnus-active-hashtb t)
12316              nil prefix nil default))
12317            ((= 1 (length split-name))
12318             (gnus-group-completing-read
12319              prom
12320              (gnus-remove-if-not 'gnus-valid-move-group-p gnus-active-hashtb t)
12321              nil prefix 'gnus-group-history (car split-name)))
12322            (t
12323             (gnus-completing-read
12324              prom (nreverse split-name) nil nil 'gnus-group-history))))
12325          (to-method (gnus-server-to-method (gnus-group-method to-newsgroup)))
12326          encoded)
12327     (when to-newsgroup
12328       (if (or (string= to-newsgroup "")
12329               (string= to-newsgroup prefix))
12330           (setq to-newsgroup default))
12331       (unless to-newsgroup
12332         (error "No group name entered"))
12333       (setq encoded (mm-encode-coding-string
12334                      to-newsgroup
12335                      (gnus-group-name-charset to-method to-newsgroup)))
12336       (or (gnus-active encoded)
12337           (gnus-activate-group encoded nil nil to-method)
12338           (if (gnus-y-or-n-p (format "No such group: %s.  Create it? "
12339                                      to-newsgroup))
12340               (or (and (gnus-request-create-group encoded to-method)
12341                        (gnus-activate-group encoded nil nil to-method)
12342                        (gnus-subscribe-group encoded))
12343                   (error "Couldn't create group %s" to-newsgroup)))
12344           (error "No such group: %s" to-newsgroup))
12345       encoded)))
12346
12347 (defvar gnus-summary-save-parts-counter)
12348 (declare-function mm-uu-dissect "mm-uu" (&optional noheader mime-type))
12349
12350 (defun gnus-summary-save-parts (type dir n &optional reverse)
12351   "Save parts matching TYPE to DIR.
12352 If REVERSE, save parts that do not match TYPE."
12353   (interactive
12354    (list (read-string "Save parts of type: "
12355                       (or (car gnus-summary-save-parts-type-history)
12356                           gnus-summary-save-parts-default-mime)
12357                       'gnus-summary-save-parts-type-history)
12358          (setq gnus-summary-save-parts-last-directory
12359                (read-directory-name "Save to directory: "
12360                                     gnus-summary-save-parts-last-directory
12361                                     nil t))
12362          current-prefix-arg))
12363   (gnus-summary-iterate n
12364     (let ((gnus-display-mime-function nil)
12365           gnus-article-prepare-hook
12366           gnus-article-decode-hook
12367           gnus-display-mime-function
12368           gnus-break-pages
12369           (gnus-inhibit-treatment t))
12370       (gnus-summary-select-article))
12371     (with-current-buffer gnus-article-buffer
12372       (let ((handles (or gnus-article-mime-handles
12373                          (mm-dissect-buffer nil gnus-article-loose-mime)
12374                          (and gnus-article-emulate-mime
12375                               (mm-uu-dissect))))
12376             (gnus-summary-save-parts-counter 1))
12377         (when handles
12378           (gnus-summary-save-parts-1 type dir handles reverse)
12379           (unless gnus-article-mime-handles ;; Don't destroy this case.
12380             (mm-destroy-parts handles)))))))
12381
12382 (defun gnus-summary-save-parts-1 (type dir handle reverse)
12383   (if (stringp (car handle))
12384       (mapcar (lambda (h) (gnus-summary-save-parts-1 type dir h reverse))
12385               (cdr handle))
12386     (when (if reverse
12387               (not (string-match type (mm-handle-media-type handle)))
12388             (string-match type (mm-handle-media-type handle)))
12389       (let ((file (expand-file-name
12390                    (gnus-map-function
12391                     mm-file-name-rewrite-functions
12392                     (file-name-nondirectory
12393                      (or
12394                       (mm-handle-filename handle)
12395                       (format "%s.%d.%d" gnus-newsgroup-name
12396                               (cdr gnus-article-current)
12397                               gnus-summary-save-parts-counter))))
12398                    dir)))
12399         (incf gnus-summary-save-parts-counter)
12400         (unless (file-exists-p file)
12401           (mm-save-part-to-file handle file))))))
12402
12403 ;; Summary extract commands
12404
12405 (defun gnus-summary-insert-pseudos (pslist &optional not-view)
12406   (let ((inhibit-read-only t)
12407         (article (gnus-summary-article-number))
12408         after-article b e)
12409     (unless (gnus-summary-goto-subject article)
12410       (error "No such article: %d" article))
12411     (gnus-summary-position-point)
12412     ;; If all commands are to be bunched up on one line, we collect
12413     ;; them here.
12414     (unless gnus-view-pseudos-separately
12415       (let ((ps (setq pslist (sort pslist 'gnus-pseudos<)))
12416             files action)
12417         (while ps
12418           (setq action (cdr (assq 'action (car ps))))
12419           (setq files (list (cdr (assq 'name (car ps)))))
12420           (while (and ps (cdr ps)
12421                       (string= (or action "1")
12422                                (or (cdr (assq 'action (cadr ps))) "2")))
12423             (push (cdr (assq 'name (cadr ps))) files)
12424             (setcdr ps (cddr ps)))
12425           (when files
12426             (when (not (string-match "%s" action))
12427               (push " " files))
12428             (push " " files)
12429             (when (assq 'execute (car ps))
12430               (setcdr (assq 'execute (car ps))
12431                       (funcall (if (string-match "%s" action)
12432                                    'format 'concat)
12433                                action
12434                                (mapconcat
12435                                 (lambda (f)
12436                                   (if (equal f " ")
12437                                       f
12438                                     (shell-quote-argument f)))
12439                                 files " ")))))
12440           (setq ps (cdr ps)))))
12441     (if (and gnus-view-pseudos (not not-view))
12442         (while pslist
12443           (when (assq 'execute (car pslist))
12444             (gnus-execute-command (cdr (assq 'execute (car pslist)))
12445                                   (eq gnus-view-pseudos 'not-confirm)))
12446           (setq pslist (cdr pslist)))
12447       (save-excursion
12448         (while pslist
12449           (setq after-article (or (cdr (assq 'article (car pslist)))
12450                                   (gnus-summary-article-number)))
12451           (gnus-summary-goto-subject after-article)
12452           (forward-line 1)
12453           (setq b (point))
12454           (insert "    " (file-name-nondirectory
12455                           (cdr (assq 'name (car pslist))))
12456                   ": " (or (cdr (assq 'execute (car pslist))) "") "\n")
12457           (setq e (point))
12458           (forward-line -1)             ; back to `b'
12459           (gnus-add-text-properties
12460            b (1- e) (list 'gnus-number gnus-reffed-article-number
12461                           gnus-mouse-face-prop gnus-mouse-face))
12462           (gnus-data-enter
12463            after-article gnus-reffed-article-number
12464            gnus-unread-mark b (car pslist) 0 (- e b))
12465           (setq gnus-newsgroup-unreads
12466                 (gnus-add-to-sorted-list gnus-newsgroup-unreads
12467                                          gnus-reffed-article-number))
12468           (setq gnus-reffed-article-number (1- gnus-reffed-article-number))
12469           (setq pslist (cdr pslist)))))))
12470
12471 (defun gnus-pseudos< (p1 p2)
12472   (let ((c1 (cdr (assq 'action p1)))
12473         (c2 (cdr (assq 'action p2))))
12474     (and c1 c2 (string< c1 c2))))
12475
12476 (defun gnus-request-pseudo-article (props)
12477   (cond ((assq 'execute props)
12478          (gnus-execute-command (cdr (assq 'execute props)))))
12479   (let ((gnus-current-article (gnus-summary-article-number)))
12480     (gnus-run-hooks 'gnus-mark-article-hook)))
12481
12482 (defun gnus-execute-command (command &optional automatic)
12483   (save-excursion
12484     (gnus-article-setup-buffer)
12485     (set-buffer gnus-article-buffer)
12486     (setq buffer-read-only nil)
12487     (let ((command (if automatic command
12488                      (read-string "Command: " (cons command 0)))))
12489       (erase-buffer)
12490       (insert "$ " command "\n\n")
12491       (if gnus-view-pseudo-asynchronously
12492           (start-process "gnus-execute" (current-buffer) shell-file-name
12493                          shell-command-switch command)
12494         (call-process shell-file-name nil t nil
12495                       shell-command-switch command)))))
12496
12497 ;; Summary kill commands.
12498
12499 (defun gnus-summary-edit-global-kill (article)
12500   "Edit the \"global\" kill file."
12501   (interactive (list (gnus-summary-article-number)))
12502   (gnus-group-edit-global-kill article))
12503
12504 (defun gnus-summary-edit-local-kill ()
12505   "Edit a local kill file applied to the current newsgroup."
12506   (interactive)
12507   (setq gnus-current-headers (gnus-summary-article-header))
12508   (gnus-group-edit-local-kill
12509    (gnus-summary-article-number) gnus-newsgroup-name))
12510
12511 ;;; Header reading.
12512
12513 (defun gnus-read-header (id &optional header)
12514   "Read the headers of article ID and enter them into the Gnus system."
12515   (let ((group gnus-newsgroup-name)
12516         (gnus-override-method
12517          (or
12518           gnus-override-method
12519           (and (gnus-news-group-p gnus-newsgroup-name)
12520                (car (gnus-refer-article-methods)))))
12521         where)
12522     ;; First we check to see whether the header in question is already
12523     ;; fetched.
12524     (if (stringp id)
12525         ;; This is a Message-ID.
12526         (setq header (or header (gnus-id-to-header id)))
12527       ;; This is an article number.
12528       (setq header (or header (gnus-summary-article-header id))))
12529     (if (and header
12530              (not (gnus-summary-article-sparse-p (mail-header-number header))))
12531         ;; We have found the header.
12532         header
12533       ;; We have to really fetch the header to this article.
12534       (with-current-buffer nntp-server-buffer
12535         (when (setq where (gnus-request-head id group))
12536           (nnheader-fold-continuation-lines)
12537           (goto-char (point-max))
12538           (insert ".\n")
12539           (goto-char (point-min))
12540           (insert "211 ")
12541           (princ (cond
12542                   ((numberp id) id)
12543                   ((cdr where) (cdr where))
12544                   (header (mail-header-number header))
12545                   (t gnus-reffed-article-number))
12546                  (current-buffer))
12547           (insert " Article retrieved.\n"))
12548         (if (or (not where)
12549                 (not (setq header (car (gnus-get-newsgroup-headers nil t)))))
12550             ()                          ; Malformed head.
12551           (unless (gnus-summary-article-sparse-p (mail-header-number header))
12552             (when (and (bound-and-true-p gnus-registry-enabled)
12553                        (not (gnus-ephemeral-group-p (car where))))
12554               (gnus-registry-handle-action
12555                (mail-header-id header) nil
12556                (gnus-group-prefixed-name
12557                 (car where)
12558                 (or gnus-override-method (gnus-find-method-for-group group)))
12559                (mail-header-subject header)
12560                (mail-header-from header)))
12561             (when (and (stringp id)
12562                        (or
12563                         (not (string= (gnus-group-real-name group)
12564                                       (car where)))
12565                         (not (gnus-server-equal gnus-override-method
12566                                                 (gnus-group-method group)))))
12567               ;; If we fetched by Message-ID and the article came from
12568               ;; a different group (or server), we fudge some bogus
12569               ;; article numbers for this article.
12570               (mail-header-set-number header gnus-reffed-article-number))
12571             (with-current-buffer gnus-summary-buffer
12572               (decf gnus-reffed-article-number)
12573               (gnus-remove-header (mail-header-number header))
12574               (push header gnus-newsgroup-headers)
12575               (setq gnus-current-headers header)
12576               (push (mail-header-number header) gnus-newsgroup-limit)))
12577           header)))))
12578
12579 (defun gnus-remove-header (number)
12580   "Remove header NUMBER from `gnus-newsgroup-headers'."
12581   (if (and gnus-newsgroup-headers
12582            (= number (mail-header-number (car gnus-newsgroup-headers))))
12583       (pop gnus-newsgroup-headers)
12584     (let ((headers gnus-newsgroup-headers))
12585       (while (and (cdr headers)
12586                   (not (= number (mail-header-number (cadr headers)))))
12587         (pop headers))
12588       (when (cdr headers)
12589         (setcdr headers (cddr headers))))))
12590
12591 ;;;
12592 ;;; summary highlights
12593 ;;;
12594
12595 (defun gnus-highlight-selected-summary ()
12596   "Highlight selected article in summary buffer."
12597   ;; Added by Per Abrahamsen <amanda@iesd.auc.dk>.
12598   (when gnus-summary-selected-face
12599     (save-excursion
12600       (let* ((beg (point-at-bol))
12601              (end (point-at-eol))
12602              ;; Fix by Mike Dugan <dugan@bucrf16.bu.edu>.
12603              (from (if (get-text-property beg gnus-mouse-face-prop)
12604                        beg
12605                      (or (next-single-property-change
12606                           beg gnus-mouse-face-prop nil end)
12607                          beg)))
12608              (to
12609               (if (= from end)
12610                   (- from 2)
12611                 (or (next-single-property-change
12612                      from gnus-mouse-face-prop nil end)
12613                     end))))
12614         ;; If no mouse-face prop on line we will have to = from = end,
12615         ;; so we highlight the entire line instead.
12616         (when (= (+ to 2) from)
12617           (setq from beg)
12618           (setq to end))
12619         (if gnus-newsgroup-selected-overlay
12620             ;; Move old overlay.
12621             (move-overlay
12622              gnus-newsgroup-selected-overlay from to (current-buffer))
12623           ;; Create new overlay.
12624           (overlay-put
12625            (setq gnus-newsgroup-selected-overlay (make-overlay from to))
12626            'face gnus-summary-selected-face))))))
12627
12628 (defvar gnus-summary-highlight-line-cached nil)
12629 (defvar gnus-summary-highlight-line-trigger nil)
12630
12631 (defun gnus-summary-highlight-line-0 ()
12632   (if (and (eq gnus-summary-highlight-line-trigger
12633                gnus-summary-highlight)
12634            gnus-summary-highlight-line-cached)
12635       gnus-summary-highlight-line-cached
12636     (setq gnus-summary-highlight-line-trigger gnus-summary-highlight
12637           gnus-summary-highlight-line-cached
12638           (let* ((cond (list 'cond))
12639                  (c cond)
12640                  (list gnus-summary-highlight))
12641             (while list
12642               (setcdr c (cons (list (caar list) (list 'quote (cdar list)))
12643                               nil))
12644               (setq c (cdr c)
12645                     list (cdr list)))
12646             (gnus-byte-compile (list 'lambda nil cond))))))
12647
12648 (defun gnus-summary-highlight-line ()
12649   "Highlight current line according to `gnus-summary-highlight'."
12650   (let* ((beg (point-at-bol))
12651          (article (or (gnus-summary-article-number) gnus-current-article))
12652          (score (or (cdr (assq article
12653                                gnus-newsgroup-scored))
12654                     gnus-summary-default-score 0))
12655          (mark (or (gnus-summary-article-mark) gnus-unread-mark))
12656          (inhibit-read-only t)
12657          (default gnus-summary-default-score)
12658          (default-high gnus-summary-default-high-score)
12659          (default-low gnus-summary-default-low-score)
12660          (uncached (and gnus-summary-use-undownloaded-faces
12661                         (memq article gnus-newsgroup-undownloaded)
12662                         (not (memq article gnus-newsgroup-cached)))))
12663     (let ((face (funcall (gnus-summary-highlight-line-0))))
12664       (unless (eq face (gnus-get-text-property-excluding-characters-with-faces beg 'face))
12665         (gnus-put-text-property-excluding-characters-with-faces
12666          beg (point-at-eol) 'face
12667          (setq face (if (boundp face) (symbol-value face) face)))
12668         (when gnus-summary-highlight-line-function
12669           (funcall gnus-summary-highlight-line-function article face))))))
12670
12671 (defun gnus-update-read-articles (group unread &optional compute)
12672   "Update the list of read articles in GROUP.
12673 UNREAD is a sorted list."
12674   (let ((active (or gnus-newsgroup-active (gnus-active group)))
12675         (info (gnus-get-info group))
12676         (prev 1)
12677         read)
12678     (if (or (not info) (not active))
12679         ;; There is no info on this group if it was, in fact,
12680         ;; killed.  Gnus stores no information on killed groups, so
12681         ;; there's nothing to be done.
12682         ;; One could store the information somewhere temporarily,
12683         ;; perhaps...  Hmmm...
12684         ()
12685       ;; Remove any negative articles numbers.
12686       (while (and unread (< (car unread) 0))
12687         (setq unread (cdr unread)))
12688       ;; Remove any expired article numbers
12689       (while (and unread (< (car unread) (car active)))
12690         (setq unread (cdr unread)))
12691       ;; Compute the ranges of read articles by looking at the list of
12692       ;; unread articles.
12693       (while unread
12694         (when (/= (car unread) prev)
12695           (push (if (= prev (1- (car unread))) prev
12696                   (cons prev (1- (car unread))))
12697                 read))
12698         (setq prev (1+ (car unread)))
12699         (setq unread (cdr unread)))
12700       (when (<= prev (cdr active))
12701         (push (cons prev (cdr active)) read))
12702       (setq read (if (> (length read) 1) (nreverse read) read))
12703       (if compute
12704           read
12705         (save-excursion
12706           (let (setmarkundo)
12707             ;; Propagate the read marks to the backend.
12708             (when (and (gnus-method-option-p
12709                         (gnus-find-method-for-group group)
12710                         'server-marks)
12711                        (gnus-check-backend-function 'request-set-mark group))
12712               (let ((del (gnus-remove-from-range (gnus-info-read info) read))
12713                     (add (gnus-remove-from-range read (gnus-info-read info))))
12714                 (when (or add del)
12715                   (unless (gnus-check-group group)
12716                     (error "Can't open server for %s" group))
12717                   (gnus-request-set-mark
12718                    group (delq nil (list (if add (list add 'add '(read)))
12719                                          (if del (list del 'del '(read))))))
12720                   (setq setmarkundo
12721                         `(gnus-request-set-mark
12722                           ,group
12723                           ',(delq nil (list
12724                                        (if del (list del 'add '(read)))
12725                                        (if add (list add 'del '(read))))))))))
12726             (set-buffer gnus-group-buffer)
12727             (gnus-undo-register
12728               `(progn
12729                  (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
12730                  (gnus-info-set-read ',info ',(gnus-info-read info))
12731                  (gnus-get-unread-articles-in-group ',info
12732                                                     (gnus-active ,group))
12733                  (gnus-group-update-group ,group t)
12734                  ,setmarkundo))))
12735         ;; Enter this list into the group info.
12736         (gnus-info-set-read info read)
12737         ;; Set the number of unread articles in gnus-newsrc-hashtb.
12738         (gnus-get-unread-articles-in-group info (gnus-active group))
12739         t))))
12740
12741 (defun gnus-offer-save-summaries ()
12742   "Offer to save all active summary buffers."
12743   (let (buffers)
12744     ;; Go through all buffers and find all summaries.
12745     (dolist (buffer (buffer-list))
12746       (when (and (setq buffer (buffer-name buffer))
12747                  (string-match "Summary" buffer)
12748                  (with-current-buffer buffer
12749                    ;; We check that this is, indeed, a summary buffer.
12750                    (and (derived-mode-p 'gnus-summary-mode)
12751                         ;; Also make sure this isn't bogus.
12752                         gnus-newsgroup-prepared
12753                         ;; Also make sure that this isn't a
12754                         ;; dead summary buffer.
12755                         (not gnus-dead-summary-mode))))
12756         (push buffer buffers)))
12757     ;; Go through all these summary buffers and offer to save them.
12758     (when buffers
12759       (save-excursion
12760         (if (eq gnus-interactive-exit 'quiet)
12761             (dolist (buffer buffers)
12762               (switch-to-buffer buffer)
12763               (gnus-summary-exit))
12764           (map-y-or-n-p
12765            "Update summary buffer %s? "
12766            (lambda (buf)
12767              (switch-to-buffer buf)
12768              (gnus-summary-exit))
12769            buffers))))))
12770
12771 (defun gnus-summary-setup-default-charset ()
12772   "Setup newsgroup default charset."
12773   (if (member gnus-newsgroup-name '("nndraft:delayed" "nndraft:drafts"))
12774       (setq gnus-newsgroup-charset nil)
12775     (let* ((ignored-charsets
12776             (or gnus-newsgroup-ephemeral-ignored-charsets
12777                 (append
12778                  (and gnus-newsgroup-name
12779                       (gnus-parameter-ignored-charsets gnus-newsgroup-name))
12780                  gnus-newsgroup-ignored-charsets))))
12781       (setq gnus-newsgroup-charset
12782             (or gnus-newsgroup-ephemeral-charset
12783                 (and gnus-newsgroup-name
12784                      (gnus-parameter-charset gnus-newsgroup-name))
12785                 gnus-default-charset))
12786       (set (make-local-variable 'gnus-newsgroup-ignored-charsets)
12787            ignored-charsets))))
12788
12789 ;;;
12790 ;;; Mime Commands
12791 ;;;
12792
12793 (defun gnus-summary-display-buttonized (&optional show-all-parts)
12794   "Display the current article buffer fully MIME-buttonized.
12795 If SHOW-ALL-PARTS (the prefix) is non-nil, all multipart/* parts are
12796 treated as multipart/mixed."
12797   (interactive "P")
12798   (require 'gnus-art)
12799   (let ((gnus-unbuttonized-mime-types nil)
12800         (gnus-mime-display-multipart-as-mixed show-all-parts))
12801     (gnus-summary-show-article)))
12802
12803 (defun gnus-summary-repair-multipart (article)
12804   "Add a Content-Type header to a multipart article without one."
12805   (interactive (list (gnus-summary-article-number)))
12806   (gnus-with-article article
12807     (message-narrow-to-head)
12808     (message-remove-header "Mime-Version")
12809     (goto-char (point-max))
12810     (insert "Mime-Version: 1.0\n")
12811     (widen)
12812     (when (search-forward "\n--" nil t)
12813       (let ((separator (buffer-substring (point) (point-at-eol))))
12814         (message-narrow-to-head)
12815         (message-remove-header "Content-Type")
12816         (goto-char (point-max))
12817         (insert (format "Content-Type: multipart/mixed; boundary=\"%s\"\n"
12818                         separator))
12819         (widen))))
12820   (let (gnus-mark-article-hook)
12821     (gnus-summary-select-article t t nil article)))
12822
12823 (defun gnus-summary-toggle-display-buttonized ()
12824   "Toggle the buttonizing of the article buffer."
12825   (interactive)
12826   (require 'gnus-art)
12827   (if (setq gnus-inhibit-mime-unbuttonizing
12828             (not gnus-inhibit-mime-unbuttonizing))
12829       (let ((gnus-unbuttonized-mime-types nil))
12830         (gnus-summary-show-article))
12831     (gnus-summary-show-article)))
12832
12833 ;;;
12834 ;;; Generic summary marking commands
12835 ;;;
12836
12837 (defvar gnus-summary-marking-alist
12838   '((read gnus-del-mark "d")
12839     (unread gnus-unread-mark "u")
12840     (ticked gnus-ticked-mark "!")
12841     (dormant gnus-dormant-mark "?")
12842     (expirable gnus-expirable-mark "e"))
12843   "An alist of names/marks/keystrokes.")
12844
12845 (defvar gnus-summary-generic-mark-map (make-sparse-keymap))
12846 (defvar gnus-summary-mark-map)
12847
12848 (defun gnus-summary-make-all-marking-commands ()
12849   (define-key gnus-summary-mark-map "M" gnus-summary-generic-mark-map)
12850   (dolist (elem gnus-summary-marking-alist)
12851     (apply 'gnus-summary-make-marking-command elem)))
12852
12853 (defun gnus-summary-make-marking-command (name mark keystroke)
12854   (let ((map (make-sparse-keymap)))
12855     (define-key gnus-summary-generic-mark-map keystroke map)
12856     (dolist (lway `((next "next" next nil "n")
12857                     (next-unread "next unread" next t "N")
12858                     (prev "previous" prev nil "p")
12859                     (prev-unread "previous unread" prev t "P")
12860                     (nomove "" nil nil ,keystroke)))
12861       (let ((func (gnus-summary-make-marking-command-1
12862                    mark (car lway) lway name)))
12863         (setq func (eval func))
12864         (define-key map (nth 4 lway) func)))))
12865
12866 (defun gnus-summary-make-marking-command-1 (mark way lway name)
12867   `(defun ,(intern
12868             (format "gnus-summary-put-mark-as-%s%s"
12869                     name (if (eq way 'nomove)
12870                              ""
12871                            (concat "-" (symbol-name way)))))
12872      (n)
12873      ,(format
12874        "Mark the current article as %s%s.
12875 If N, the prefix, then repeat N times.
12876 If N is negative, move in reverse order.
12877 The difference between N and the actual number of articles marked is
12878 returned."
12879        name (cadr lway))
12880      (interactive "p")
12881      (gnus-summary-generic-mark n ,mark ',(nth 2 lway) ,(nth 3 lway))))
12882
12883 (defun gnus-summary-generic-mark (n mark move unread)
12884   "Mark N articles with MARK."
12885   (unless (derived-mode-p 'gnus-summary-mode)
12886     (error "This command can only be used in the summary buffer"))
12887   (gnus-summary-show-thread)
12888   (let ((nummove
12889          (cond
12890           ((eq move 'next) 1)
12891           ((eq move 'prev) -1)
12892           (t 0))))
12893     (if (zerop nummove)
12894         (setq n 1)
12895       (when (< n 0)
12896         (setq n (abs n)
12897               nummove (* -1 nummove))))
12898     (while (and (> n 0)
12899                 (gnus-summary-mark-article nil mark)
12900                 (zerop (gnus-summary-next-subject nummove unread t)))
12901       (setq n (1- n)))
12902     (when (/= 0 n)
12903       (gnus-message 7 "No more %sarticles" (if mark "" "unread ")))
12904     (gnus-summary-recenter)
12905     (gnus-summary-position-point)
12906     (gnus-set-mode-line 'summary)
12907     n))
12908
12909 (defun gnus-summary-insert-articles (articles)
12910   (when (setq articles
12911               (gnus-sorted-difference articles
12912                                       (mapcar (lambda (h)
12913                                                 (mail-header-number h))
12914                                               gnus-newsgroup-headers)))
12915     (setq gnus-newsgroup-headers
12916           (gnus-merge 'list
12917                       gnus-newsgroup-headers
12918                       (gnus-fetch-headers articles nil t)
12919                       'gnus-article-sort-by-number))
12920     (setq gnus-newsgroup-articles
12921           (gnus-sorted-nunion gnus-newsgroup-articles articles))
12922     ;; Suppress duplicates?
12923     (when gnus-suppress-duplicates
12924       (gnus-dup-suppress-articles))
12925
12926     (if (and gnus-fetch-old-headers
12927              (eq gnus-headers-retrieved-by 'nov))
12928         ;; We might want to build some more threads first.
12929         (if (eq gnus-fetch-old-headers 'invisible)
12930             (gnus-build-all-threads)
12931           (gnus-build-old-threads))
12932       ;; Mark the inserted articles that are unread as unread.
12933       (setq gnus-newsgroup-unreads
12934             (gnus-sorted-nunion
12935              gnus-newsgroup-unreads
12936              (gnus-sorted-nintersection
12937               (gnus-list-of-unread-articles gnus-newsgroup-name)
12938               articles)))
12939       ;; Mark the inserted articles as selected so that the information
12940       ;; of the marks having been changed by a user may be updated when
12941       ;; exiting this group.  See `gnus-summary-update-info'.
12942       (dolist (art articles)
12943         (setq gnus-newsgroup-unselected (delq art gnus-newsgroup-unselected))))
12944     ;; Let the Gnus agent mark articles as read.
12945     (when gnus-agent
12946       (gnus-agent-get-undownloaded-list))
12947     ;; Remove list identifiers from subject
12948     (gnus-summary-remove-list-identifiers)
12949     ;; First and last article in this newsgroup.
12950     (when gnus-newsgroup-headers
12951       (setq gnus-newsgroup-begin
12952             (mail-header-number (car gnus-newsgroup-headers))
12953             gnus-newsgroup-end
12954             (mail-header-number
12955              (gnus-last-element gnus-newsgroup-headers))))
12956     (when gnus-use-scoring
12957       (gnus-possibly-score-headers))))
12958
12959 (defun gnus-summary-insert-old-articles (&optional all)
12960   "Insert all old articles in this group.
12961 If ALL is non-nil, already read articles become readable.
12962 If ALL is a number, fetch this number of articles."
12963   (interactive "P")
12964   (prog1
12965       (let ((old (sort (mapcar 'car gnus-newsgroup-data) '<))
12966             older len)
12967         (setq older
12968               ;; Some nntp servers lie about their active range.  When
12969               ;; this happens, the active range can be in the millions.
12970               ;; Use a compressed range to avoid creating a huge list.
12971               (gnus-range-difference
12972                (gnus-range-difference (list gnus-newsgroup-active) old)
12973                gnus-newsgroup-unexist))
12974         (setq len (gnus-range-length older))
12975         (cond
12976          ((null older) nil)
12977          ((numberp all)
12978           (if (< all len)
12979               (let ((older-range (nreverse older)))
12980                 (setq older nil)
12981
12982                 (while (> all 0)
12983                   (let* ((r (pop older-range))
12984                          (min (if (numberp r) r (car r)))
12985                          (max (if (numberp r) r (cdr r))))
12986                     (while (and (<= min max)
12987                                 (> all 0))
12988                       (push max older)
12989                       (setq all (1- all)
12990                             max (1- max))))))
12991             (setq older (gnus-uncompress-range older))))
12992          (all
12993           (setq older (gnus-uncompress-range older)))
12994          (t
12995           (when (and (numberp gnus-large-newsgroup)
12996                    (> len gnus-large-newsgroup))
12997               (let* ((cursor-in-echo-area nil)
12998                      (initial (gnus-parameter-large-newsgroup-initial
12999                                gnus-newsgroup-name))
13000                      (input
13001                       (read-string
13002                        (format
13003                         "How many articles from %s (%s %d): "
13004                         (gnus-group-decoded-name gnus-newsgroup-name)
13005                         (if initial "max" "default")
13006                         len)
13007                        nil nil
13008                        (and initial
13009                             (number-to-string initial)))))
13010                 (unless (string-match "^[ \t]*$" input)
13011                   (setq all (string-to-number input))
13012                   (if (< all len)
13013                       (let ((older-range (nreverse older)))
13014                         (setq older nil)
13015
13016                         (while (> all 0)
13017                           (let* ((r (pop older-range))
13018                                  (min (if (numberp r) r (car r)))
13019                                  (max (if (numberp r) r (cdr r))))
13020                             (while (and (<= min max)
13021                                         (> all 0))
13022                               (push max older)
13023                               (setq all (1- all)
13024                                     max (1- max))))))))))
13025           (setq older (gnus-uncompress-range older))))
13026         (if (not older)
13027             (message "No old news.")
13028           (gnus-summary-insert-articles older)
13029           (gnus-summary-limit (gnus-sorted-nunion old older))))
13030     (gnus-summary-position-point)))
13031
13032 (defun gnus-summary-insert-new-articles ()
13033   "Insert all new articles in this group."
13034   (interactive)
13035   (let ((old (sort (mapcar 'car gnus-newsgroup-data) '<))
13036         (old-high gnus-newsgroup-highest)
13037         (nnmail-fetched-sources (list t))
13038         (new-active (gnus-activate-group gnus-newsgroup-name 'scan))
13039         i new)
13040     (unless new-active
13041       (error "Couldn't fetch new data"))
13042     (setq gnus-newsgroup-active (gnus-copy-sequence new-active))
13043     (setq i (cdr gnus-newsgroup-active)
13044           gnus-newsgroup-highest i)
13045     (while (> i old-high)
13046       (push i new)
13047       (decf i))
13048     (if (not new)
13049         (message "No gnus is bad news")
13050       (gnus-summary-insert-articles new)
13051       (setq gnus-newsgroup-unreads
13052             (gnus-sorted-nunion gnus-newsgroup-unreads new))
13053       (gnus-summary-limit (gnus-sorted-nunion old new))))
13054   (gnus-summary-position-point))
13055
13056 ;;; Bookmark support for Gnus.
13057 (declare-function gnus-article-show-summary "gnus-art" ())
13058 (declare-function bookmark-make-record-default
13059                   "bookmark" (&optional no-file no-context posn))
13060 (declare-function bookmark-prop-get "bookmark" (bookmark prop))
13061 (declare-function bookmark-default-handler "bookmark" (bmk))
13062 (declare-function bookmark-get-bookmark-record "bookmark" (bmk))
13063 (defvar bookmark-yank-point)
13064 (defvar bookmark-current-buffer)
13065
13066 (defun gnus-summary-bookmark-make-record ()
13067   "Make a bookmark entry for a Gnus summary buffer."
13068   (let (pos buf)
13069     (unless (and (derived-mode-p 'gnus-summary-mode) gnus-article-current)
13070       (save-restriction              ; FIXME is it necessary to widen?
13071         (widen) (setq pos (point))) ; Set position in gnus-article buffer.
13072       (setq buf "art") ; We are recording bookmark from article buffer.
13073       (setq bookmark-yank-point (point))
13074       (setq bookmark-current-buffer (current-buffer))
13075       (gnus-article-show-summary))      ; Go back in summary buffer.
13076     ;; We are now recording bookmark from summary buffer.
13077     (unless buf (setq buf "sum"))
13078     (let* ((subject (elt (gnus-summary-article-header) 1))
13079            (grp     (car gnus-article-current))
13080            (art     (cdr gnus-article-current))
13081            (head    (gnus-summary-article-header art))
13082            (id      (mail-header-id head)))
13083       `(,subject
13084         ,@(condition-case nil
13085               (bookmark-make-record-default 'no-file 'no-context pos)
13086             (wrong-number-of-arguments
13087              (bookmark-make-record-default 'point-only)))
13088         (location . ,(format "Gnus-%s %s:%d:%s" buf grp art id))
13089         (group . ,grp) (article . ,art)
13090         (message-id . ,id) (handler . gnus-summary-bookmark-jump)))))
13091
13092 ;;;###autoload
13093 (defun gnus-summary-bookmark-jump (bookmark)
13094   "Handler function for record returned by `gnus-summary-bookmark-make-record'.
13095 BOOKMARK is a bookmark name or a bookmark record."
13096   (let ((group    (bookmark-prop-get bookmark 'group))
13097         (article  (bookmark-prop-get bookmark 'article))
13098         (id       (bookmark-prop-get bookmark 'message-id))
13099         (buf      (car (split-string (bookmark-prop-get bookmark 'location)))))
13100     (gnus-fetch-group group (list article))
13101     (gnus-summary-insert-cached-articles)
13102     (gnus-summary-goto-article id nil 'force)
13103     ;; FIXME we have to wait article buffer is ready (only large buffer)
13104     ;; Is there a better solution to know that?
13105     ;; If we don't wait `bookmark-default-handler' will have no chance
13106     ;; to set position. However there is no error, just wrong pos.
13107     (sit-for 1)
13108     (when (string= buf "Gnus-art")
13109       (other-window 1))
13110     (bookmark-default-handler
13111      `(""
13112        (buffer . ,(current-buffer))
13113        . ,(bookmark-get-bookmark-record bookmark)))))
13114
13115 (gnus-summary-make-all-marking-commands)
13116
13117 (gnus-ems-redefine)
13118
13119 (provide 'gnus-sum)
13120
13121 (run-hooks 'gnus-sum-load-hook)
13122
13123 ;; Local Variables:
13124 ;; coding: utf-8
13125 ;; End:
13126
13127 ;;; gnus-sum.el ends here