lisp/gnus/gnus-sum.el

   1 ;;; gnus-sum.el --- summary mode commands for Gnus
   2
   3 ;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
   5
   6 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   7 ;; Keywords: news
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;;; Code:
  27
  28 ;; For Emacs < 22.2.
  29 (eval-and-compile
  30   (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
  31 (eval-when-compile
  32   (require 'cl))
  33
  34 (defvar tool-bar-mode)
  35 (defvar gnus-tmp-header)
  36
  37 (require 'gnus)
  38 (require 'gnus-group)
  39 (require 'gnus-spec)
  40 (require 'gnus-range)
  41 (require 'gnus-int)
  42 (require 'gnus-undo)
  43 (require 'gnus-util)
  44 (require 'gmm-utils)
  45 (require 'mm-decode)
  46 (require 'nnoo)
  47
  48 (autoload 'gnus-summary-limit-include-cached "gnus-cache" nil t)
  49 (autoload 'gnus-cache-write-active "gnus-cache")
  50 (autoload 'gnus-mailing-list-insinuate "gnus-ml" nil t)
  51 (autoload 'turn-on-gnus-mailing-list-mode "gnus-ml" nil t)
  52 (autoload 'gnus-pick-line-number "gnus-salt" nil t)
  53 (autoload 'mm-uu-dissect "mm-uu")
  54 (autoload 'gnus-article-outlook-deuglify-article "deuglify"
  55   "Deuglify broken Outlook (Express) articles and redisplay."
  56   t)
  57 (autoload 'gnus-article-outlook-unwrap-lines "deuglify" nil t)
  58 (autoload 'gnus-article-outlook-repair-attribution "deuglify" nil t)
  59 (autoload 'gnus-article-outlook-rearrange-citation "deuglify" nil t)
  60
  61 (defcustom gnus-kill-summary-on-exit t
  62   "*If non-nil, kill the summary buffer when you exit from it.
  63 If nil, the summary will become a \"*Dead Summary*\" buffer, and
  64 it will be killed sometime later."
  65   :group 'gnus-summary-exit
  66   :type 'boolean)
  67
  68 (defcustom gnus-summary-next-group-on-exit t
  69   "If non-nil, go to the next unread newsgroup on summary exit.
  70 See `gnus-group-goto-unread'."
  71   :link '(custom-manual "(gnus)Group Maneuvering")
  72   :group 'gnus-summary-exit
  73   :version "23.1" ;; No Gnus
  74   :type 'boolean)
  75
  76 (defcustom gnus-fetch-old-headers nil
  77   "*Non-nil means that Gnus will try to build threads by grabbing old headers.
  78 If an unread article in the group refers to an older, already
  79 read (or just marked as read) article, the old article will not
  80 normally be displayed in the Summary buffer.  If this variable is
  81 t, Gnus will attempt to grab the headers to the old articles, and
  82 thereby build complete threads.  If it has the value `some', all
  83 old headers will be fetched but only enough headers to connect
  84 otherwise loose threads will be displayed.  This variable can
  85 also be a number.  In that case, no more than that number of old
  86 headers will be fetched.  If it has the value `invisible', all
  87 old headers will be fetched, but none will be displayed.
  88
  89 The server has to support NOV for any of this to work.
  90
  91 This feature can seriously impact performance it ignores all
  92 locally cached header entries.  Setting it to t for groups for a
  93 server that doesn't expire articles (such as news.gmane.org),
  94 leads to very slow summary generation."
  95   :group 'gnus-thread
  96   :type '(choice (const :tag "off" nil)
  97                  (const :tag "on" t)
  98                  (const some)
  99                  (const invisible)
 100                  number
 101                  (sexp :menu-tag "other" t)))
 102
 103 (defcustom gnus-refer-thread-limit 500
 104   "*The number of old headers to fetch when doing \\<gnus-summary-mode-map>\\[gnus-summary-refer-thread].
 105 If t, fetch all the available old headers."
 106   :group 'gnus-thread
 107   :type '(choice number
 108                  (sexp :menu-tag "other" t)))
 109
 110 (defcustom gnus-summary-make-false-root 'adopt
 111   "*nil means that Gnus won't gather loose threads.
 112 If the root of a thread has expired or been read in a previous
 113 session, the information necessary to build a complete thread has been
 114 lost.  Instead of having many small sub-threads from this original thread
 115 scattered all over the summary buffer, Gnus can gather them.
 116
 117 If non-nil, Gnus will try to gather all loose sub-threads from an
 118 original thread into one large thread.
 119
 120 If this variable is non-nil, it should be one of `none', `adopt',
 121 `dummy' or `empty'.
 122
 123 If this variable is `none', Gnus will not make a false root, but just
 124 present the sub-threads after another.
 125 If this variable is `dummy', Gnus will create a dummy root that will
 126 have all the sub-threads as children.
 127 If this variable is `adopt', Gnus will make one of the \"children\"
 128 the parent and mark all the step-children as such.
 129 If this variable is `empty', the \"children\" are printed with empty
 130 subject fields.  (Or rather, they will be printed with a string
 131 given by the `gnus-summary-same-subject' variable.)"
 132   :group 'gnus-thread
 133   :type '(choice (const :tag "off" nil)
 134                  (const none)
 135                  (const dummy)
 136                  (const adopt)
 137                  (const empty)))
 138
 139 (defcustom gnus-summary-make-false-root-always nil
 140   "Always make a false dummy root."
 141   :version "22.1"
 142   :group 'gnus-thread
 143   :type 'boolean)
 144
 145 (defcustom gnus-summary-gather-exclude-subject "^ *$\\|^(none)$"
 146   "*A regexp to match subjects to be excluded from loose thread gathering.
 147 As loose thread gathering is done on subjects only, that means that
 148 there can be many false gatherings performed.  By rooting out certain
 149 common subjects, gathering might become saner."
 150   :group 'gnus-thread
 151   :type 'regexp)
 152
 153 (defcustom gnus-summary-gather-subject-limit nil
 154   "*Maximum length of subject comparisons when gathering loose threads.
 155 Use nil to compare full subjects.  Setting this variable to a low
 156 number will help gather threads that have been corrupted by
 157 newsreaders chopping off subject lines, but it might also mean that
 158 unrelated articles that have subject that happen to begin with the
 159 same few characters will be incorrectly gathered.
 160
 161 If this variable is `fuzzy', Gnus will use a fuzzy algorithm when
 162 comparing subjects."
 163   :group 'gnus-thread
 164   :type '(choice (const :tag "off" nil)
 165                  (const fuzzy)
 166                  (sexp :menu-tag "on" t)))
 167
 168 (defcustom gnus-simplify-subject-functions nil
 169   "List of functions taking a string argument that simplify subjects.
 170 The functions are applied recursively.
 171
 172 Useful functions to put in this list include:
 173 `gnus-simplify-subject-re', `gnus-simplify-subject-fuzzy',
 174 `gnus-simplify-whitespace', and `gnus-simplify-all-whitespace'."
 175   :group 'gnus-thread
 176   :type '(repeat function))
 177
 178 (defcustom gnus-simplify-ignored-prefixes nil
 179   "*Remove matches for this regexp from subject lines when simplifying fuzzily."
 180   :group 'gnus-thread
 181   :type '(choice (const :tag "off" nil)
 182                  regexp))
 183
 184 (defcustom gnus-build-sparse-threads nil
 185   "*If non-nil, fill in the gaps in threads.
 186 If `some', only fill in the gaps that are needed to tie loose threads
 187 together.  If `more', fill in all leaf nodes that Gnus can find.  If
 188 non-nil and non-`some', fill in all gaps that Gnus manages to guess."
 189   :group 'gnus-thread
 190   :type '(choice (const :tag "off" nil)
 191                  (const some)
 192                  (const more)
 193                  (sexp :menu-tag "all" t)))
 194
 195 (defcustom gnus-summary-thread-gathering-function
 196   'gnus-gather-threads-by-subject
 197   "*Function used for gathering loose threads.
 198 There are two pre-defined functions: `gnus-gather-threads-by-subject',
 199 which only takes Subjects into consideration; and
 200 `gnus-gather-threads-by-references', which compared the References
 201 headers of the articles to find matches."
 202   :group 'gnus-thread
 203   :type '(radio (function-item gnus-gather-threads-by-subject)
 204                 (function-item gnus-gather-threads-by-references)
 205                 (function :tag "other")))
 206
 207 (defcustom gnus-summary-same-subject ""
 208   "*String indicating that the current article has the same subject as the previous.
 209 This variable will only be used if the value of
 210 `gnus-summary-make-false-root' is `empty'."
 211   :group 'gnus-summary-format
 212   :type 'string)
 213
 214 (defcustom gnus-summary-goto-unread t
 215   "*If t, many commands will go to the next unread article.
 216 This applies to marking commands as well as other commands that
 217 \"naturally\" select the next article, like, for instance, `SPC' at
 218 the end of an article.
 219
 220 If nil, the marking commands do NOT go to the next unread article
 221 \(they go to the next article instead).  If `never', commands that
 222 usually go to the next unread article, will go to the next article,
 223 whether it is read or not."
 224   :group 'gnus-summary-marks
 225   :link '(custom-manual "(gnus)Setting Marks")
 226   :type '(choice (const :tag "off" nil)
 227                  (const never)
 228                  (sexp :menu-tag "on" t)))
 229
 230 (defcustom gnus-summary-default-score 0
 231   "*Default article score level.
 232 All scores generated by the score files will be added to this score.
 233 If this variable is nil, scoring will be disabled."
 234   :group 'gnus-score-default
 235   :type '(choice (const :tag "disable")
 236                  integer))
 237
 238 (defcustom gnus-summary-default-high-score 0
 239   "*Default threshold for a high scored article.
 240 An article will be highlighted as high scored if its score is greater
 241 than this score."
 242   :version "22.1"
 243   :group 'gnus-score-default
 244   :type 'integer)
 245
 246 (defcustom gnus-summary-default-low-score 0
 247   "*Default threshold for a low scored article.
 248 An article will be highlighted as low scored if its score is smaller
 249 than this score."
 250   :version "22.1"
 251   :group 'gnus-score-default
 252   :type 'integer)
 253
 254 (defcustom gnus-summary-zcore-fuzz 0
 255   "*Fuzziness factor for the zcore in the summary buffer.
 256 Articles with scores closer than this to `gnus-summary-default-score'
 257 will not be marked."
 258   :group 'gnus-summary-format
 259   :type 'integer)
 260
 261 (defcustom gnus-simplify-subject-fuzzy-regexp nil
 262   "*Strings to be removed when doing fuzzy matches.
 263 This can either be a regular expression or list of regular expressions
 264 that will be removed from subject strings if fuzzy subject
 265 simplification is selected."
 266   :group 'gnus-thread
 267   :type '(repeat regexp))
 268
 269 (defcustom gnus-show-threads t
 270   "*If non-nil, display threads in summary mode."
 271   :group 'gnus-thread
 272   :type 'boolean)
 273
 274 (defcustom gnus-thread-hide-subtree nil
 275   "*If non-nil, hide all threads initially.
 276 This can be a predicate specifier which says which threads to hide.
 277 If threads are hidden, you have to run the command
 278 `gnus-summary-show-thread' by hand or select an article."
 279   :group 'gnus-thread
 280   :type '(radio (sexp :format "Non-nil\n"
 281                       :match (lambda (widget value)
 282                                (not (or (consp value) (functionp value))))
 283                       :value t)
 284                 (const nil)
 285                 (sexp :tag "Predicate specifier")))
 286
 287 (defcustom gnus-thread-hide-killed t
 288   "*If non-nil, hide killed threads automatically."
 289   :group 'gnus-thread
 290   :type 'boolean)
 291
 292 (defcustom gnus-thread-ignore-subject t
 293   "*If non-nil, which is the default, ignore subjects and do all threading based on the Reference header.
 294 If nil, articles that have different subjects from their parents will
 295 start separate threads."
 296   :group 'gnus-thread
 297   :type 'boolean)
 298
 299 (defcustom gnus-thread-operation-ignore-subject t
 300   "*If non-nil, subjects will be ignored when doing thread commands.
 301 This affects commands like `gnus-summary-kill-thread' and
 302 `gnus-summary-lower-thread'.
 303
 304 If this variable is nil, articles in the same thread with different
 305 subjects will not be included in the operation in question.  If this
 306 variable is `fuzzy', only articles that have subjects that are fuzzily
 307 equal will be included."
 308   :group 'gnus-thread
 309   :type '(choice (const :tag "off" nil)
 310                  (const fuzzy)
 311                  (sexp :tag "on" t)))
 312
 313 (defcustom gnus-thread-indent-level 4
 314   "*Number that says how much each sub-thread should be indented."
 315   :group 'gnus-thread
 316   :type 'integer)
 317
 318 (defcustom gnus-auto-extend-newsgroup t
 319   "*If non-nil, extend newsgroup forward and backward when requested."
 320   :group 'gnus-summary-choose
 321   :type 'boolean)
 322
 323 (defcustom gnus-auto-select-first t
 324   "If non-nil, select an article on group entry.
 325 An article is selected automatically when entering a group
 326 e.g. with \\<gnus-group-mode-map>\\[gnus-group-read-group], or via `gnus-summary-next-page' or
 327 `gnus-summary-catchup-and-goto-next-group'.
 328
 329 Which article is selected is controlled by the variable
 330 `gnus-auto-select-subject'.
 331
 332 If you want to prevent automatic selection of articles in some
 333 newsgroups, set the variable to nil in `gnus-select-group-hook'."
 334   ;; Commands include...
 335   ;; \\<gnus-group-mode-map>\\[gnus-group-read-group]
 336   ;; \\<gnus-summary-mode-map>\\[gnus-summary-next-page]
 337   ;; \\<gnus-summary-mode-map>\\[gnus-summary-catchup-and-goto-next-group]
 338   :group 'gnus-group-select
 339   :type '(choice (const :tag "none" nil)
 340                  (sexp :menu-tag "first" t)))
 341
 342 (defcustom gnus-auto-select-subject 'unread
 343   "*Says what subject to place under point when entering a group.
 344
 345 This variable can either be the symbols `first' (place point on the
 346 first subject), `unread' (place point on the subject line of the first
 347 unread article), `best' (place point on the subject line of the
 348 higest-scored article), `unseen' (place point on the subject line of
 349 the first unseen article), `unseen-or-unread' (place point on the subject
 350 line of the first unseen article or, if all article have been seen, on the
 351 subject line of the first unread article), or a function to be called to
 352 place point on some subject line."
 353   :version "22.1"
 354   :group 'gnus-group-select
 355   :type '(choice (const best)
 356                  (const unread)
 357                  (const first)
 358                  (const unseen)
 359                  (const unseen-or-unread)))
 360
 361 (defcustom gnus-auto-select-next t
 362   "*If non-nil, offer to go to the next group from the end of the previous.
 363 If the value is t and the next newsgroup is empty, Gnus will exit
 364 summary mode and go back to group mode.  If the value is neither nil
 365 nor t, Gnus will select the following unread newsgroup.  In
 366 particular, if the value is the symbol `quietly', the next unread
 367 newsgroup will be selected without any confirmation, and if it is
 368 `almost-quietly', the next group will be selected without any
 369 confirmation if you are located on the last article in the group.
 370 Finally, if this variable is `slightly-quietly', the `\\<gnus-summary-mode-map>\\[gnus-summary-catchup-and-goto-next-group]' command
 371 will go to the next group without confirmation."
 372   :group 'gnus-summary-maneuvering
 373   :type '(choice (const :tag "off" nil)
 374                  (const quietly)
 375                  (const almost-quietly)
 376                  (const slightly-quietly)
 377                  (sexp :menu-tag "on" t)))
 378
 379 (defcustom gnus-auto-select-same nil
 380   "*If non-nil, select the next article with the same subject.
 381 If there are no more articles with the same subject, go to
 382 the first unread article."
 383   :group 'gnus-summary-maneuvering
 384   :type 'boolean)
 385
 386 (defcustom gnus-auto-select-on-ephemeral-exit 'next-noselect
 387   "What article should be selected after exiting an ephemeral group.
 388 Valid values include:
 389
 390 `next'
 391   Select the next article.
 392 `next-unread'
 393   Select the next unread article.
 394 `next-noselect'
 395   Move the cursor to the next article.  This is the default.
 396 `next-unread-noselect'
 397   Move the cursor to the next unread article.
 398
 399 If it has any other value or there is no next (unread) article, the
 400 article selected before entering to the ephemeral group will appear."
 401   :version "23.1" ;; No Gnus
 402   :group 'gnus-summary-maneuvering
 403   :type '(choice :format "%{%t%}:\n %[Value Menu%] %v"
 404                  (const next) (const next-unread)
 405                  (const next-noselect) (const next-unread-noselect)
 406                  (sexp :tag "other" :value nil)))
 407
 408 (defcustom gnus-auto-goto-ignores 'unfetched
 409   "*Says how to handle unfetched articles when maneuvering.
 410
 411 This variable can either be the symbols nil (maneuver to any
 412 article), `undownloaded' (maneuvering while unplugged ignores articles
 413 that have not been fetched), `always-undownloaded' (maneuvering always
 414 ignores articles that have not been fetched), `unfetched' (maneuvering
 415 ignores articles whose headers have not been fetched).
 416
 417 NOTE: The list of unfetched articles will always be nil when plugged
 418 and, when unplugged, a subset of the undownloaded article list."
 419   :version "22.1"
 420   :group 'gnus-summary-maneuvering
 421   :type '(choice (const :tag "None" nil)
 422                  (const :tag "Undownloaded when unplugged" undownloaded)
 423                  (const :tag "Undownloaded" always-undownloaded)
 424                  (const :tag "Unfetched" unfetched)))
 425
 426 (defcustom gnus-summary-check-current nil
 427   "*If non-nil, consider the current article when moving.
 428 The \"unread\" movement commands will stay on the same line if the
 429 current article is unread."
 430   :group 'gnus-summary-maneuvering
 431   :type 'boolean)
 432
 433 (defcustom gnus-auto-center-summary 2
 434   "*If non-nil, always center the current summary buffer.
 435 In particular, if `vertical' do only vertical recentering.  If non-nil
 436 and non-`vertical', do both horizontal and vertical recentering."
 437   :group 'gnus-summary-maneuvering
 438   :type '(choice (const :tag "none" nil)
 439                  (const vertical)
 440                  (integer :tag "height")
 441                  (sexp :menu-tag "both" t)))
 442
 443 (defvar gnus-auto-center-group t
 444   "*If non-nil, always center the group buffer.")
 445
 446 (defcustom gnus-show-all-headers nil
 447   "*If non-nil, don't hide any headers."
 448   :group 'gnus-article-hiding
 449   :group 'gnus-article-headers
 450   :type 'boolean)
 451
 452 (defcustom gnus-summary-ignore-duplicates nil
 453   "*If non-nil, ignore articles with identical Message-ID headers."
 454   :group 'gnus-summary
 455   :type 'boolean)
 456
 457 (defcustom gnus-single-article-buffer t
 458   "*If non-nil, display all articles in the same buffer.
 459 If nil, each group will get its own article buffer."
 460   :group 'gnus-article-various
 461   :type 'boolean)
 462
 463 (defcustom gnus-break-pages t
 464   "*If non-nil, do page breaking on articles.
 465 The page delimiter is specified by the `gnus-page-delimiter'
 466 variable."
 467   :group 'gnus-article-various
 468   :type 'boolean)
 469
 470 (defcustom gnus-move-split-methods nil
 471   "*Variable used to suggest where articles are to be moved to.
 472 It uses the same syntax as the `gnus-split-methods' variable.
 473 However, whereas `gnus-split-methods' specifies file names as targets,
 474 this variable specifies group names."
 475   :group 'gnus-summary-mail
 476   :type '(repeat (choice (list :value (fun) function)
 477                          (cons :value ("" "") regexp (repeat string))
 478                          (sexp :value nil))))
 479
 480 (defcustom gnus-move-group-prefix-function 'gnus-group-real-prefix
 481   "Function used to compute default prefix for article move/copy/etc prompts.
 482 The function should take one argument, a group name, and return a
 483 string with the suggested prefix."
 484   :group 'gnus-summary-mail
 485   :type 'function)
 486
 487 ;; FIXME: Although the custom type is `character' for the following variables,
 488 ;; using multibyte characters (Latin-1, UTF-8) doesn't work.  -- rs
 489
 490 (defcustom gnus-unread-mark ?           ;Whitespace
 491   "*Mark used for unread articles."
 492   :group 'gnus-summary-marks
 493   :type 'character)
 494
 495 (defcustom gnus-ticked-mark ?!
 496   "*Mark used for ticked articles."
 497   :group 'gnus-summary-marks
 498   :type 'character)
 499
 500 (defcustom gnus-dormant-mark ??
 501   "*Mark used for dormant articles."
 502   :group 'gnus-summary-marks
 503   :type 'character)
 504
 505 (defcustom gnus-del-mark ?r
 506   "*Mark used for del'd articles."
 507   :group 'gnus-summary-marks
 508   :type 'character)
 509
 510 (defcustom gnus-read-mark ?R
 511   "*Mark used for read articles."
 512   :group 'gnus-summary-marks
 513   :type 'character)
 514
 515 (defcustom gnus-expirable-mark ?E
 516   "*Mark used for expirable articles."
 517   :group 'gnus-summary-marks
 518   :type 'character)
 519
 520 (defcustom gnus-killed-mark ?K
 521   "*Mark used for killed articles."
 522   :group 'gnus-summary-marks
 523   :type 'character)
 524
 525 (defcustom gnus-spam-mark ?$
 526   "*Mark used for spam articles."
 527   :version "22.1"
 528   :group 'gnus-summary-marks
 529   :type 'character)
 530
 531 (defcustom gnus-souped-mark ?F
 532   "*Mark used for souped articles."
 533   :group 'gnus-summary-marks
 534   :type 'character)
 535
 536 (defcustom gnus-kill-file-mark ?X
 537   "*Mark used for articles killed by kill files."
 538   :group 'gnus-summary-marks
 539   :type 'character)
 540
 541 (defcustom gnus-low-score-mark ?Y
 542   "*Mark used for articles with a low score."
 543   :group 'gnus-summary-marks
 544   :type 'character)
 545
 546 (defcustom gnus-catchup-mark ?C
 547   "*Mark used for articles that are caught up."
 548   :group 'gnus-summary-marks
 549   :type 'character)
 550
 551 (defcustom gnus-replied-mark ?A
 552   "*Mark used for articles that have been replied to."
 553   :group 'gnus-summary-marks
 554   :type 'character)
 555
 556 (defcustom gnus-forwarded-mark ?F
 557   "*Mark used for articles that have been forwarded."
 558   :version "22.1"
 559   :group 'gnus-summary-marks
 560   :type 'character)
 561
 562 (defcustom gnus-recent-mark ?N
 563   "*Mark used for articles that are recent."
 564   :version "22.1"
 565   :group 'gnus-summary-marks
 566   :type 'character)
 567
 568 (defcustom gnus-cached-mark ?*
 569   "*Mark used for articles that are in the cache."
 570   :group 'gnus-summary-marks
 571   :type 'character)
 572
 573 (defcustom gnus-saved-mark ?S
 574   "*Mark used for articles that have been saved."
 575   :group 'gnus-summary-marks
 576   :type 'character)
 577
 578 (defcustom gnus-unseen-mark ?.
 579   "*Mark used for articles that haven't been seen."
 580   :version "22.1"
 581   :group 'gnus-summary-marks
 582   :type 'character)
 583
 584 (defcustom gnus-no-mark ?               ;Whitespace
 585   "*Mark used for articles that have no other secondary mark."
 586   :version "22.1"
 587   :group 'gnus-summary-marks
 588   :type 'character)
 589
 590 (defcustom gnus-ancient-mark ?O
 591   "*Mark used for ancient articles."
 592   :group 'gnus-summary-marks
 593   :type 'character)
 594
 595 (defcustom gnus-sparse-mark ?Q
 596   "*Mark used for sparsely reffed articles."
 597   :group 'gnus-summary-marks
 598   :type 'character)
 599
 600 (defcustom gnus-canceled-mark ?G
 601   "*Mark used for canceled articles."
 602   :group 'gnus-summary-marks
 603   :type 'character)
 604
 605 (defcustom gnus-duplicate-mark ?M
 606   "*Mark used for duplicate articles."
 607   :group 'gnus-summary-marks
 608   :type 'character)
 609
 610 (defcustom gnus-undownloaded-mark ?-
 611   "*Mark used for articles that weren't downloaded."
 612   :version "22.1"
 613   :group 'gnus-summary-marks
 614   :type 'character)
 615
 616 (defcustom gnus-downloaded-mark ?+
 617   "*Mark used for articles that were downloaded."
 618   :group 'gnus-summary-marks
 619   :type 'character)
 620
 621 (defcustom gnus-downloadable-mark ?%
 622   "*Mark used for articles that are to be downloaded."
 623   :group 'gnus-summary-marks
 624   :type 'character)
 625
 626 (defcustom gnus-unsendable-mark ?=
 627   "*Mark used for articles that won't be sent."
 628   :group 'gnus-summary-marks
 629   :type 'character)
 630
 631 (defcustom gnus-score-over-mark ?+
 632   "*Score mark used for articles with high scores."
 633   :group 'gnus-summary-marks
 634   :type 'character)
 635
 636 (defcustom gnus-score-below-mark ?-
 637   "*Score mark used for articles with low scores."
 638   :group 'gnus-summary-marks
 639   :type 'character)
 640
 641 (defcustom gnus-empty-thread-mark ?     ;Whitespace
 642   "*There is no thread under the article."
 643   :group 'gnus-summary-marks
 644   :type 'character)
 645
 646 (defcustom gnus-not-empty-thread-mark ?=
 647   "*There is a thread under the article."
 648   :group 'gnus-summary-marks
 649   :type 'character)
 650
 651 (defcustom gnus-view-pseudo-asynchronously nil
 652   "*If non-nil, Gnus will view pseudo-articles asynchronously."
 653   :group 'gnus-extract-view
 654   :type 'boolean)
 655
 656 (defcustom gnus-auto-expirable-marks
 657   (list gnus-killed-mark gnus-del-mark gnus-catchup-mark
 658         gnus-low-score-mark gnus-ancient-mark gnus-read-mark
 659         gnus-souped-mark gnus-duplicate-mark)
 660   "*The list of marks converted into expiration if a group is auto-expirable."
 661   :version "21.1"
 662   :group 'gnus-summary
 663   :type '(repeat character))
 664
 665 (defcustom gnus-inhibit-user-auto-expire t
 666   "*If non-nil, user marking commands will not mark an article as expirable, even if the group has auto-expire turned on."
 667   :version "21.1"
 668   :group 'gnus-summary
 669   :type 'boolean)
 670
 671 (defcustom gnus-mark-copied-or-moved-articles-as-expirable nil
 672   "If non-nil, mark articles copied or moved to auto-expire group as expirable.
 673 If nil, the expirable marks will be unchanged except that the marks
 674 will be removed when copying or moving articles to a group that has
 675 not turned auto-expire on.  If non-nil, articles that have been read
 676 will be marked as expirable when being copied or moved to a group in
 677 which auto-expire is turned on."
 678   :version "23.2"
 679   :type 'boolean
 680   :group 'gnus-summary-marks)
 681
 682 (defcustom gnus-view-pseudos nil
 683   "*If `automatic', pseudo-articles will be viewed automatically.
 684 If `not-confirm', pseudos will be viewed automatically, and the user
 685 will not be asked to confirm the command."
 686   :group 'gnus-extract-view
 687   :type '(choice (const :tag "off" nil)
 688                  (const automatic)
 689                  (const not-confirm)))
 690
 691 (defcustom gnus-view-pseudos-separately t
 692   "*If non-nil, one pseudo-article will be created for each file to be viewed.
 693 If nil, all files that use the same viewing command will be given as a
 694 list of parameters to that command."
 695   :group 'gnus-extract-view
 696   :type 'boolean)
 697
 698 (defcustom gnus-insert-pseudo-articles t
 699   "*If non-nil, insert pseudo-articles when decoding articles."
 700   :group 'gnus-extract-view
 701   :type 'boolean)
 702
 703 (defcustom gnus-summary-dummy-line-format
 704   "   %(:                             :%) %S\n"
 705   "*The format specification for the dummy roots in the summary buffer.
 706 It works along the same lines as a normal formatting string,
 707 with some simple extensions.
 708
 709 %S  The subject
 710
 711 General format specifiers can also be used.
 712 See `(gnus)Formatting Variables'."
 713   :link '(custom-manual "(gnus)Formatting Variables")
 714   :group 'gnus-threading
 715   :type 'string)
 716
 717 (defcustom gnus-summary-mode-line-format "Gnus: %g [%A] %Z"
 718   "*The format specification for the summary mode line.
 719 It works along the same lines as a normal formatting string,
 720 with some simple extensions:
 721
 722 %G  Group name
 723 %p  Unprefixed group name
 724 %A  Current article number
 725 %z  Current article score
 726 %V  Gnus version
 727 %U  Number of unread articles in the group
 728 %e  Number of unselected articles in the group
 729 %Z  A string with unread/unselected article counts
 730 %g  Shortish group name
 731 %S  Subject of the current article
 732 %u  User-defined spec
 733 %s  Current score file name
 734 %d  Number of dormant articles
 735 %r  Number of articles that have been marked as read in this session
 736 %E  Number of articles expunged by the score files"
 737   :group 'gnus-summary-format
 738   :type 'string)
 739
 740 (defcustom gnus-list-identifiers nil
 741   "Regexp that matches list identifiers to be removed from subject.
 742 This can also be a list of regexps."
 743   :version "21.1"
 744   :group 'gnus-summary-format
 745   :group 'gnus-article-hiding
 746   :type '(choice (const :tag "none" nil)
 747                  (regexp :value ".*")
 748                  (repeat :value (".*") regexp)))
 749
 750 (defcustom gnus-summary-mark-below 0
 751   "*Mark all articles with a score below this variable as read.
 752 This variable is local to each summary buffer and usually set by the
 753 score file."
 754   :group 'gnus-score-default
 755   :type 'integer)
 756
 757 (defun gnus-widget-reversible-match (widget value)
 758   "Ignoring WIDGET, convert VALUE to internal form.
 759 VALUE should have the form `FOO' or `(not FOO)', where FOO is an symbol."
 760   ;; (debug value)
 761   (or (symbolp value)
 762       (and (listp value)
 763            (eq (length value) 2)
 764            (eq (nth 0 value) 'not)
 765            (symbolp (nth 1 value)))))
 766
 767 (defun gnus-widget-reversible-to-internal (widget value)
 768   "Ignoring WIDGET, convert VALUE to internal form.
 769 VALUE should have the form `FOO' or `(not FOO)', where FOO is an atom.
 770 FOO is converted to (FOO nil) and (not FOO) is converted to (FOO t)."
 771   ;; (debug value)
 772   (if (atom value)
 773       (list value nil)
 774     (list (nth 1 value) t)))
 775
 776 (defun gnus-widget-reversible-to-external (widget value)
 777   "Ignoring WIDGET, convert VALUE to external form.
 778 VALUE should have the form `(FOO nil)' or `(FOO t)', where FOO is an atom.
 779 \(FOO  nil) is converted to FOO and (FOO t) is converted to (not FOO)."
 780   ;; (debug value)
 781   (if (nth 1 value)
 782       (list 'not (nth 0 value))
 783     (nth 0 value)))
 784
 785 (define-widget 'gnus-widget-reversible 'group
 786   "A `group' that convert values."
 787   :match 'gnus-widget-reversible-match
 788   :value-to-internal 'gnus-widget-reversible-to-internal
 789   :value-to-external 'gnus-widget-reversible-to-external)
 790
 791 (defcustom gnus-article-sort-functions '(gnus-article-sort-by-number)
 792   "*List of functions used for sorting articles in the summary buffer.
 793
 794 Each function takes two articles and returns non-nil if the first
 795 article should be sorted before the other.  If you use more than one
 796 function, the primary sort function should be the last.  You should
 797 probably always include `gnus-article-sort-by-number' in the list of
 798 sorting functions -- preferably first.  Also note that sorting by date
 799 is often much slower than sorting by number, and the sorting order is
 800 very similar.  (Sorting by date means sorting by the time the message
 801 was sent, sorting by number means sorting by arrival time.)
 802
 803 Each item can also be a list `(not F)' where F is a function;
 804 this reverses the sort order.
 805
 806 Ready-made functions include `gnus-article-sort-by-number',
 807 `gnus-article-sort-by-author', `gnus-article-sort-by-subject',
 808 `gnus-article-sort-by-date', `gnus-article-sort-by-random'
 809 and `gnus-article-sort-by-score'.
 810
 811 When threading is turned on, the variable `gnus-thread-sort-functions'
 812 controls how articles are sorted."
 813   :group 'gnus-summary-sort
 814   :type '(repeat (gnus-widget-reversible
 815                   (choice (function-item gnus-article-sort-by-number)
 816                           (function-item gnus-article-sort-by-author)
 817                           (function-item gnus-article-sort-by-subject)
 818                           (function-item gnus-article-sort-by-date)
 819                           (function-item gnus-article-sort-by-score)
 820                           (function-item gnus-article-sort-by-random)
 821                           (function :tag "other"))
 822                   (boolean :tag "Reverse order"))))
 823
 824
 825 (defcustom gnus-thread-sort-functions '(gnus-thread-sort-by-number)
 826   "*List of functions used for sorting threads in the summary buffer.
 827 By default, threads are sorted by article number.
 828
 829 Each function takes two threads and returns non-nil if the first
 830 thread should be sorted before the other.  If you use more than one
 831 function, the primary sort function should be the last.  You should
 832 probably always include `gnus-thread-sort-by-number' in the list of
 833 sorting functions -- preferably first.  Also note that sorting by date
 834 is often much slower than sorting by number, and the sorting order is
 835 very similar.  (Sorting by date means sorting by the time the message
 836 was sent, sorting by number means sorting by arrival time.)
 837
 838 Each list item can also be a list `(not F)' where F is a
 839 function; this specifies reversed sort order.
 840
 841 Ready-made functions include `gnus-thread-sort-by-number',
 842 `gnus-thread-sort-by-author', `gnus-thread-sort-by-recipient'
 843 `gnus-thread-sort-by-subject', `gnus-thread-sort-by-date',
 844 `gnus-thread-sort-by-score', `gnus-thread-sort-by-most-recent-number',
 845 `gnus-thread-sort-by-most-recent-date', `gnus-thread-sort-by-random',
 846 and `gnus-thread-sort-by-total-score' (see
 847 `gnus-thread-score-function').
 848
 849 When threading is turned off, the variable
 850 `gnus-article-sort-functions' controls how articles are sorted."
 851   :group 'gnus-summary-sort
 852   :type '(repeat
 853           (gnus-widget-reversible
 854            (choice (function-item gnus-thread-sort-by-number)
 855                    (function-item gnus-thread-sort-by-author)
 856                    (function-item gnus-thread-sort-by-recipient)
 857                    (function-item gnus-thread-sort-by-subject)
 858                    (function-item gnus-thread-sort-by-date)
 859                    (function-item gnus-thread-sort-by-score)
 860                    (function-item gnus-thread-sort-by-most-recent-number)
 861                    (function-item gnus-thread-sort-by-most-recent-date)
 862                    (function-item gnus-thread-sort-by-random)
 863                    (function-item gnus-thread-sort-by-total-score)
 864                    (function :tag "other"))
 865            (boolean :tag "Reverse order"))))
 866
 867 (defcustom gnus-thread-score-function '+
 868   "*Function used for calculating the total score of a thread.
 869
 870 The function is called with the scores of the article and each
 871 subthread and should then return the score of the thread.
 872
 873 Some functions you can use are `+', `max', or `min'."
 874   :group 'gnus-summary-sort
 875   :type 'function)
 876
 877 (defcustom gnus-summary-expunge-below nil
 878   "All articles that have a score less than this variable will be expunged.
 879 This variable is local to the summary buffers."
 880   :group 'gnus-score-default
 881   :type '(choice (const :tag "off" nil)
 882                  integer))
 883
 884 (defcustom gnus-thread-expunge-below nil
 885   "All threads that have a total score less than this variable will be expunged.
 886 See `gnus-thread-score-function' for en explanation of what a
 887 \"thread score\" is.
 888
 889 This variable is local to the summary buffers."
 890   :group 'gnus-threading
 891   :group 'gnus-score-default
 892   :type '(choice (const :tag "off" nil)
 893                  integer))
 894
 895 (defcustom gnus-summary-mode-hook nil
 896   "*A hook for Gnus summary mode.
 897 This hook is run before any variables are set in the summary buffer."
 898   :options '(turn-on-gnus-mailing-list-mode gnus-pick-mode)
 899   :group 'gnus-summary-various
 900   :type 'hook)
 901
 902 ;; Extracted from gnus-xmas-redefine in order to preserve user settings
 903 (when (featurep 'xemacs)
 904   (add-hook 'gnus-summary-mode-hook 'gnus-xmas-summary-menu-add)
 905   (add-hook 'gnus-summary-mode-hook 'gnus-xmas-setup-summary-toolbar)
 906   (add-hook 'gnus-summary-mode-hook
 907             'gnus-xmas-switch-horizontal-scrollbar-off))
 908
 909 (defcustom gnus-summary-menu-hook nil
 910   "*Hook run after the creation of the summary mode menu."
 911   :group 'gnus-summary-visual
 912   :type 'hook)
 913
 914 (defcustom gnus-summary-exit-hook nil
 915   "*A hook called on exit from the summary buffer.
 916 It will be called with point in the group buffer."
 917   :group 'gnus-summary-exit
 918   :type 'hook)
 919
 920 (defcustom gnus-summary-prepare-hook nil
 921   "*A hook called after the summary buffer has been generated.
 922 If you want to modify the summary buffer, you can use this hook."
 923   :group 'gnus-summary-various
 924   :type 'hook)
 925
 926 (defcustom gnus-summary-prepared-hook nil
 927   "*A hook called as the last thing after the summary buffer has been generated."
 928   :group 'gnus-summary-various
 929   :type 'hook)
 930
 931 (defcustom gnus-summary-generate-hook nil
 932   "*A hook run just before generating the summary buffer.
 933 This hook is commonly used to customize threading variables and the
 934 like."
 935   :group 'gnus-summary-various
 936   :type 'hook)
 937
 938 (defcustom gnus-select-group-hook nil
 939   "*A hook called when a newsgroup is selected.
 940
 941 If you'd like to simplify subjects like the
 942 `gnus-summary-next-same-subject' command does, you can use the
 943 following hook:
 944
 945  (add-hook gnus-select-group-hook
 946            (lambda ()
 947              (mapcar (lambda (header)
 948                        (mail-header-set-subject
 949                         header
 950                         (gnus-simplify-subject
 951                          (mail-header-subject header) 're-only)))
 952                      gnus-newsgroup-headers)))"
 953   :group 'gnus-group-select
 954   :type 'hook)
 955
 956 (defcustom gnus-select-article-hook nil
 957   "*A hook called when an article is selected."
 958   :group 'gnus-summary-choose
 959   :options '(gnus-agent-fetch-selected-article)
 960   :type 'hook)
 961
 962 (defcustom gnus-visual-mark-article-hook
 963   (list 'gnus-highlight-selected-summary)
 964   "*Hook run after selecting an article in the summary buffer.
 965 It is meant to be used for highlighting the article in some way.  It
 966 is not run if `gnus-visual' is nil."
 967   :group 'gnus-summary-visual
 968   :type 'hook)
 969
 970 (defcustom gnus-parse-headers-hook nil
 971   "*A hook called before parsing the headers."
 972   :group 'gnus-various
 973   :type 'hook)
 974
 975 (defcustom gnus-exit-group-hook nil
 976   "*A hook called when exiting summary mode.
 977 This hook is not called from the non-updating exit commands like `Q'."
 978   :group 'gnus-various
 979   :type 'hook)
 980
 981 (defcustom gnus-summary-update-hook
 982   (list 'gnus-summary-highlight-line)
 983   "*A hook called when a summary line is changed.
 984 The hook will not be called if `gnus-visual' is nil.
 985
 986 The default function `gnus-summary-highlight-line' will
 987 highlight the line according to the `gnus-summary-highlight'
 988 variable."
 989   :group 'gnus-summary-visual
 990   :type 'hook)
 991
 992 (defcustom gnus-mark-article-hook '(gnus-summary-mark-read-and-unread-as-read)
 993   "*A hook called when an article is selected for the first time.
 994 The hook is intended to mark an article as read (or unread)
 995 automatically when it is selected."
 996   :group 'gnus-summary-choose
 997   :type 'hook)
 998
 999 (defcustom gnus-group-no-more-groups-hook nil
1000   "*A hook run when returning to group mode having no more (unread) groups."
1001   :group 'gnus-group-select
1002   :type 'hook)
1003
1004 (defcustom gnus-ps-print-hook nil
1005   "*A hook run before ps-printing something from Gnus."
1006   :group 'gnus-summary
1007   :type 'hook)
1008
1009 (defcustom gnus-summary-article-move-hook nil
1010   "*A hook called after an article is moved, copied, respooled, or crossposted."
1011   :version "22.1"
1012   :group 'gnus-summary
1013   :type 'hook)
1014
1015 (defcustom gnus-summary-article-delete-hook nil
1016   "*A hook called after an article is deleted."
1017   :version "22.1"
1018   :group 'gnus-summary
1019   :type 'hook)
1020
1021 (defcustom gnus-summary-article-expire-hook nil
1022   "*A hook called after an article is expired."
1023   :version "22.1"
1024   :group 'gnus-summary
1025   :type 'hook)
1026
1027 (defcustom gnus-summary-display-arrow
1028   (and (fboundp 'display-graphic-p)
1029        (display-graphic-p))
1030   "*If non-nil, display an arrow highlighting the current article."
1031   :version "22.1"
1032   :group 'gnus-summary
1033   :type 'boolean)
1034
1035 (defcustom gnus-summary-selected-face 'gnus-summary-selected
1036   "Face used for highlighting the current article in the summary buffer."
1037   :group 'gnus-summary-visual
1038   :type 'face)
1039
1040 (defvar gnus-tmp-downloaded nil)
1041
1042 (defcustom gnus-summary-highlight
1043   '(((eq mark gnus-canceled-mark)
1044      . gnus-summary-cancelled)
1045     ((and uncached (> score default-high))
1046      . gnus-summary-high-undownloaded)
1047     ((and uncached (< score default-low))
1048      . gnus-summary-low-undownloaded)
1049     (uncached
1050      . gnus-summary-normal-undownloaded)
1051     ((and (> score default-high)
1052           (or (eq mark gnus-dormant-mark)
1053               (eq mark gnus-ticked-mark)))
1054      . gnus-summary-high-ticked)
1055     ((and (< score default-low)
1056           (or (eq mark gnus-dormant-mark)
1057               (eq mark gnus-ticked-mark)))
1058      . gnus-summary-low-ticked)
1059     ((or (eq mark gnus-dormant-mark)
1060          (eq mark gnus-ticked-mark))
1061      . gnus-summary-normal-ticked)
1062     ((and (> score default-high) (eq mark gnus-ancient-mark))
1063      . gnus-summary-high-ancient)
1064     ((and (< score default-low) (eq mark gnus-ancient-mark))
1065      . gnus-summary-low-ancient)
1066     ((eq mark gnus-ancient-mark)
1067      . gnus-summary-normal-ancient)
1068     ((and (> score default-high) (eq mark gnus-unread-mark))
1069      . gnus-summary-high-unread)
1070     ((and (< score default-low) (eq mark gnus-unread-mark))
1071      . gnus-summary-low-unread)
1072     ((eq mark gnus-unread-mark)
1073      . gnus-summary-normal-unread)
1074     ((> score default-high)
1075      . gnus-summary-high-read)
1076     ((< score default-low)
1077      . gnus-summary-low-read)
1078     (t
1079      . gnus-summary-normal-read))
1080   "*Controls the highlighting of summary buffer lines.
1081
1082 A list of (FORM . FACE) pairs.  When deciding how a particular
1083 summary line should be displayed, each form is evaluated.  The content
1084 of the face field after the first true form is used.  You can change
1085 how those summary lines are displayed, by editing the face field.
1086
1087 You can use the following variables in the FORM field.
1088
1089 score:        The article's score.
1090 default:      The default article score.
1091 default-high: The default score for high scored articles.
1092 default-low:  The default score for low scored articles.
1093 below:        The score below which articles are automatically marked as read.
1094 mark:         The article's mark.
1095 uncached:     Non-nil if the article is uncached."
1096   :group 'gnus-summary-visual
1097   :type '(repeat (cons (sexp :tag "Form" nil)
1098                        face)))
1099 (put 'gnus-summary-highlight 'risky-local-variable t)
1100
1101 (defcustom gnus-alter-header-function nil
1102   "Function called to allow alteration of article header structures.
1103 The function is called with one parameter, the article header vector,
1104 which it may alter in any way."
1105   :type '(choice (const :tag "None" nil)
1106                  function)
1107   :group 'gnus-summary)
1108
1109 (defvar gnus-decode-encoded-word-function 'mail-decode-encoded-word-string
1110   "Function used to decode a string with encoded words.")
1111
1112 (defvar gnus-decode-encoded-address-function
1113   'mail-decode-encoded-address-string
1114   "Function used to decode addresses with encoded words.")
1115
1116 (defcustom gnus-extra-headers '(To Newsgroups)
1117   "*Extra headers to parse."
1118   :version "21.1"
1119   :group 'gnus-summary
1120   :type '(repeat symbol))
1121
1122 (defcustom gnus-ignored-from-addresses
1123   (and user-mail-address
1124        (not (string= user-mail-address ""))
1125        (regexp-quote user-mail-address))
1126   "*From headers that may be suppressed in favor of To headers.
1127 This can be a regexp or a list of regexps."
1128   :version "21.1"
1129   :group 'gnus-summary
1130   :type '(choice regexp
1131                  (repeat :tag "Regexp List" regexp)))
1132
1133 (defsubst gnus-ignored-from-addresses ()
1134   (gmm-regexp-concat gnus-ignored-from-addresses))
1135
1136 (defcustom gnus-summary-to-prefix "-> "
1137   "*String prefixed to the To field in the summary line when
1138 using `gnus-ignored-from-addresses'."
1139   :version "22.1"
1140   :group 'gnus-summary
1141   :type 'string)
1142
1143 (defcustom gnus-summary-newsgroup-prefix "=> "
1144   "*String prefixed to the Newsgroup field in the summary
1145 line when using `gnus-ignored-from-addresses'."
1146   :version "22.1"
1147   :group 'gnus-summary
1148   :type 'string)
1149
1150 (defcustom gnus-newsgroup-ignored-charsets '(unknown-8bit x-unknown)
1151   "List of charsets that should be ignored.
1152 When these charsets are used in the \"charset\" parameter, the
1153 default charset will be used instead."
1154   :version "21.1"
1155   :type '(repeat symbol)
1156   :group 'gnus-charset)
1157
1158 (defcustom gnus-newsgroup-maximum-articles nil
1159   "The maximum number of articles a newsgroup.
1160 If this is a number, old articles in a newsgroup exceeding this number
1161 are silently ignored.  If it is nil, no article is ignored.  Note that
1162 setting this variable to a number might prevent you from reading very
1163 old articles."
1164   :group 'gnus-group-select
1165   :version "22.2"
1166   :type '(choice (const :tag "No limit" nil)
1167                  integer))
1168
1169 (gnus-define-group-parameter
1170  ignored-charsets
1171  :type list
1172  :function-document
1173  "Return the ignored charsets of GROUP."
1174  :variable gnus-group-ignored-charsets-alist
1175  :variable-default
1176  '(("alt\\.chinese\\.text" iso-8859-1))
1177  :variable-document
1178  "Alist of regexps (to match group names) and charsets that should be ignored.
1179 When these charsets are used in the \"charset\" parameter, the
1180 default charset will be used instead."
1181  :variable-group gnus-charset
1182  :variable-type '(repeat (cons (regexp :tag "Group")
1183                                (repeat symbol)))
1184  :parameter-type '(choice :tag "Ignored charsets"
1185                           :value nil
1186                           (repeat (symbol)))
1187  :parameter-document       "\
1188 List of charsets that should be ignored.
1189
1190 When these charsets are used in the \"charset\" parameter, the
1191 default charset will be used instead.")
1192
1193 (defcustom gnus-group-highlight-words-alist nil
1194   "Alist of group regexps and highlight regexps.
1195 This variable uses the same syntax as `gnus-emphasis-alist'."
1196   :version "21.1"
1197   :type '(repeat (cons (regexp :tag "Group")
1198                        (repeat (list (regexp :tag "Highlight regexp")
1199                                      (number :tag "Group for entire word" 0)
1200                                      (number :tag "Group for displayed part" 0)
1201                                      (symbol :tag "Face"
1202                                              gnus-emphasis-highlight-words)))))
1203   :group 'gnus-summary-visual)
1204
1205 (defcustom gnus-summary-show-article-charset-alist
1206   nil
1207   "Alist of number and charset.
1208 The article will be shown with the charset corresponding to the
1209 numbered argument.
1210 For example: ((1 . cn-gb-2312) (2 . big5))."
1211   :version "21.1"
1212   :type '(repeat (cons (number :tag "Argument" 1)
1213                        (symbol :tag "Charset")))
1214   :group 'gnus-charset)
1215
1216 (defcustom gnus-preserve-marks t
1217   "Whether marks are preserved when moving, copying and respooling messages."
1218   :version "21.1"
1219   :type 'boolean
1220   :group 'gnus-summary-marks)
1221
1222 (defcustom gnus-propagate-marks t
1223   "If non-nil, do not propagate marks to the backends."
1224   :version "23.1" ;; No Gnus
1225   :type 'boolean
1226   :group 'gnus-summary-marks)
1227
1228 (defcustom gnus-alter-articles-to-read-function nil
1229   "Function to be called to alter the list of articles to be selected."
1230   :type '(choice (const nil) function)
1231   :group 'gnus-summary)
1232
1233 (defcustom gnus-orphan-score nil
1234   "*All orphans get this score added.  Set in the score file."
1235   :group 'gnus-score-default
1236   :type '(choice (const nil)
1237                  integer))
1238
1239 (defcustom gnus-summary-save-parts-default-mime "image/.*"
1240   "*A regexp to match MIME parts when saving multiple parts of a
1241 message with `gnus-summary-save-parts' (\\<gnus-summary-mode-map>\\[gnus-summary-save-parts]).
1242 This regexp will be used by default when prompting the user for which
1243 type of files to save."
1244   :group 'gnus-summary
1245   :type 'regexp)
1246
1247 (defcustom gnus-read-all-available-headers nil
1248   "Whether Gnus should parse all headers made available to it.
1249 This is mostly relevant for slow back ends where the user may
1250 wish to widen the summary buffer to include all headers
1251 that were fetched.  Say, for nnultimate groups."
1252   :version "22.1"
1253   :group 'gnus-summary
1254   :type '(choice boolean regexp))
1255
1256 (defcustom gnus-summary-pipe-output-default-command nil
1257   "Command (and optional arguments) used to pipe article to subprocess.
1258 This will be used as the default command if it is non-nil.  The value
1259 will be updated if you modify it when executing the command
1260 `gnus-summary-pipe-output' or the function `gnus-summary-save-in-pipe'."
1261   :version "23.1" ;; No Gnus
1262   :group 'gnus-summary
1263   :type '(radio (const :tag "None" nil) (string :tag "Command")))
1264
1265 (defcustom gnus-summary-muttprint-program "muttprint"
1266   "Command (and optional arguments) used to run Muttprint.
1267 The value will be updated if you modify it when executing the command
1268 `gnus-summary-muttprint'."
1269   :version "22.1"
1270   :group 'gnus-summary
1271   :type 'string)
1272
1273 (defcustom gnus-article-loose-mime t
1274   "If non-nil, don't require MIME-Version header.
1275 Some brain-damaged MUA/MTA, e.g. Lotus Domino 5.0.6 clients, does not
1276 supply the MIME-Version header or deliberately strip it from the mail.
1277 If non-nil (the default), Gnus will treat some articles as MIME
1278 even if the MIME-Version header is missing."
1279   :version "22.1"
1280   :type 'boolean
1281   :group 'gnus-article-mime)
1282
1283 (defcustom gnus-article-emulate-mime t
1284   "If non-nil, use MIME emulation for uuencode and the like.
1285 This means that Gnus will search message bodies for text that look
1286 like uuencoded bits, yEncoded bits, and so on, and present that using
1287 the normal Gnus MIME machinery."
1288   :version "22.1"
1289   :type 'boolean
1290   :group 'gnus-article-mime)
1291
1292 ;;; Internal variables
1293
1294 (defvar gnus-summary-display-cache nil)
1295 (defvar gnus-article-mime-handles nil)
1296 (defvar gnus-article-decoded-p nil)
1297 (defvar gnus-article-charset nil)
1298 (defvar gnus-article-ignored-charsets nil)
1299 (defvar gnus-scores-exclude-files nil)
1300 (defvar gnus-page-broken nil)
1301
1302 (defvar gnus-original-article nil)
1303 (defvar gnus-article-internal-prepare-hook nil)
1304 (defvar gnus-newsgroup-process-stack nil)
1305
1306 (defvar gnus-thread-indent-array nil)
1307 (defvar gnus-thread-indent-array-level gnus-thread-indent-level)
1308 (defvar gnus-sort-gathered-threads-function 'gnus-thread-sort-by-number
1309   "Function called to sort the articles within a thread after it has been gathered together.")
1310
1311 (defvar gnus-summary-save-parts-type-history nil)
1312 (defvar gnus-summary-save-parts-last-directory mm-default-directory)
1313
1314 ;; Avoid highlighting in kill files.
1315 (defvar gnus-summary-inhibit-highlight nil)
1316 (defvar gnus-newsgroup-selected-overlay nil)
1317 (defvar gnus-inhibit-limiting nil)
1318 (defvar gnus-newsgroup-adaptive-score-file nil)
1319 (defvar gnus-current-score-file nil)
1320 (defvar gnus-current-move-group nil)
1321 (defvar gnus-current-copy-group nil)
1322 (defvar gnus-current-crosspost-group nil)
1323 (defvar gnus-newsgroup-display nil)
1324
1325 (defvar gnus-newsgroup-dependencies nil)
1326 (defvar gnus-newsgroup-adaptive nil)
1327 (defvar gnus-summary-display-article-function nil)
1328 (defvar gnus-summary-highlight-line-function nil
1329   "Function called after highlighting a summary line.")
1330
1331 (defvar gnus-summary-line-format-alist
1332   `((?N ,(macroexpand '(mail-header-number gnus-tmp-header)) ?d)
1333     (?S ,(macroexpand '(mail-header-subject gnus-tmp-header)) ?s)
1334     (?s gnus-tmp-subject-or-nil ?s)
1335     (?n gnus-tmp-name ?s)
1336     (?A (car (cdr (funcall gnus-extract-address-components gnus-tmp-from)))
1337         ?s)
1338     (?a (or (car (funcall gnus-extract-address-components gnus-tmp-from))
1339             gnus-tmp-from) ?s)
1340     (?F gnus-tmp-from ?s)
1341     (?x ,(macroexpand '(mail-header-xref gnus-tmp-header)) ?s)
1342     (?D ,(macroexpand '(mail-header-date gnus-tmp-header)) ?s)
1343     (?d (gnus-dd-mmm (mail-header-date gnus-tmp-header)) ?s)
1344     (?o (gnus-date-iso8601 (mail-header-date gnus-tmp-header)) ?s)
1345     (?M ,(macroexpand '(mail-header-id gnus-tmp-header)) ?s)
1346     (?r ,(macroexpand '(mail-header-references gnus-tmp-header)) ?s)
1347     (?c (or (mail-header-chars gnus-tmp-header) 0) ?d)
1348     (?k (gnus-summary-line-message-size gnus-tmp-header) ?s)
1349     (?L gnus-tmp-lines ?s)
1350     (?O gnus-tmp-downloaded ?c)
1351     (?I gnus-tmp-indentation ?s)
1352     (?T (if (= gnus-tmp-level 0) "" (make-string (frame-width) ? )) ?s)
1353     (?R gnus-tmp-replied ?c)
1354     (?\[ gnus-tmp-opening-bracket ?c)
1355     (?\] gnus-tmp-closing-bracket ?c)
1356     (?\> (make-string gnus-tmp-level ? ) ?s)
1357     (?\< (make-string (max 0 (- 20 gnus-tmp-level)) ? ) ?s)
1358     (?i gnus-tmp-score ?d)
1359     (?z gnus-tmp-score-char ?c)
1360     (?V (gnus-thread-total-score (and (boundp 'thread) (car thread))) ?d)
1361     (?U gnus-tmp-unread ?c)
1362     (?f (gnus-summary-from-or-to-or-newsgroups gnus-tmp-header gnus-tmp-from)
1363         ?s)
1364     (?t (gnus-summary-number-of-articles-in-thread
1365          (and (boundp 'thread) (car thread)) gnus-tmp-level)
1366         ?d)
1367     (?e (gnus-summary-number-of-articles-in-thread
1368          (and (boundp 'thread) (car thread)) gnus-tmp-level t)
1369         ?c)
1370     (?u gnus-tmp-user-defined ?s)
1371     (?P (gnus-pick-line-number) ?d)
1372     (?B gnus-tmp-thread-tree-header-string ?s)
1373     (user-date (gnus-user-date
1374                 ,(macroexpand '(mail-header-date gnus-tmp-header))) ?s))
1375   "An alist of format specifications that can appear in summary lines.
1376 These are paired with what variables they correspond with, along with
1377 the type of the variable (string, integer, character, etc).")
1378
1379 (defvar gnus-summary-dummy-line-format-alist
1380   `((?S gnus-tmp-subject ?s)
1381     (?N gnus-tmp-number ?d)
1382     (?u gnus-tmp-user-defined ?s)))
1383
1384 (defvar gnus-summary-mode-line-format-alist
1385   `((?G gnus-tmp-group-name ?s)
1386     (?g (gnus-short-group-name gnus-tmp-group-name) ?s)
1387     (?p (gnus-group-real-name gnus-tmp-group-name) ?s)
1388     (?A gnus-tmp-article-number ?d)
1389     (?Z gnus-tmp-unread-and-unselected ?s)
1390     (?V gnus-version ?s)
1391     (?U gnus-tmp-unread-and-unticked ?d)
1392     (?S gnus-tmp-subject ?s)
1393     (?e gnus-tmp-unselected ?d)
1394     (?u gnus-tmp-user-defined ?s)
1395     (?d (length gnus-newsgroup-dormant) ?d)
1396     (?t (length gnus-newsgroup-marked) ?d)
1397     (?h (length gnus-newsgroup-spam-marked) ?d)
1398     (?r (length gnus-newsgroup-reads) ?d)
1399     (?z (gnus-summary-article-score gnus-tmp-article-number) ?d)
1400     (?E gnus-newsgroup-expunged-tally ?d)
1401     (?s (gnus-current-score-file-nondirectory) ?s)))
1402
1403 ;; This is here rather than in gnus-art for compilation reasons.
1404 (defvar gnus-article-mode-line-format-alist
1405   (nconc '((?w (gnus-article-wash-status) ?s)
1406            (?m (gnus-article-mime-part-status) ?s))
1407          gnus-summary-mode-line-format-alist))
1408
1409 (defvar gnus-last-search-regexp nil
1410   "Default regexp for article search command.")
1411
1412 (defvar gnus-last-shell-command nil
1413   "Default shell command on article.")
1414
1415 (defvar gnus-newsgroup-agentized nil
1416   "Locally bound in each summary buffer to indicate whether the server has been agentized.")
1417 (defvar gnus-newsgroup-begin nil)
1418 (defvar gnus-newsgroup-end nil)
1419 (defvar gnus-newsgroup-last-rmail nil)
1420 (defvar gnus-newsgroup-last-mail nil)
1421 (defvar gnus-newsgroup-last-folder nil)
1422 (defvar gnus-newsgroup-last-file nil)
1423 (defvar gnus-newsgroup-last-directory nil)
1424 (defvar gnus-newsgroup-auto-expire nil)
1425 (defvar gnus-newsgroup-active nil)
1426
1427 (defvar gnus-newsgroup-data nil)
1428 (defvar gnus-newsgroup-data-reverse nil)
1429 (defvar gnus-newsgroup-limit nil)
1430 (defvar gnus-newsgroup-limits nil)
1431 (defvar gnus-summary-use-undownloaded-faces nil)
1432
1433 (defvar gnus-newsgroup-unreads nil
1434   "Sorted list of unread articles in the current newsgroup.")
1435
1436 (defvar gnus-newsgroup-unselected nil
1437   "Sorted list of unselected unread articles in the current newsgroup.")
1438
1439 (defvar gnus-newsgroup-reads nil
1440   "Alist of read articles and article marks in the current newsgroup.")
1441
1442 (defvar gnus-newsgroup-expunged-tally nil)
1443
1444 (defvar gnus-newsgroup-marked nil
1445   "Sorted list of ticked articles in the current newsgroup (a subset of unread art).")
1446
1447 (defvar gnus-newsgroup-spam-marked nil
1448   "List of ranges of articles that have been marked as spam.")
1449
1450 (defvar gnus-newsgroup-killed nil
1451   "List of ranges of articles that have been through the scoring process.")
1452
1453 (defvar gnus-newsgroup-cached nil
1454   "Sorted list of articles that come from the article cache.")
1455
1456 (defvar gnus-newsgroup-saved nil
1457   "List of articles that have been saved.")
1458
1459 (defvar gnus-newsgroup-kill-headers nil)
1460
1461 (defvar gnus-newsgroup-replied nil
1462   "List of articles that have been replied to in the current newsgroup.")
1463
1464 (defvar gnus-newsgroup-forwarded nil
1465   "List of articles that have been forwarded in the current newsgroup.")
1466
1467 (defvar gnus-newsgroup-recent nil
1468   "List of articles that have are recent in the current newsgroup.")
1469
1470 (defvar gnus-newsgroup-expirable nil
1471   "Sorted list of articles in the current newsgroup that can be expired.")
1472
1473 (defvar gnus-newsgroup-processable nil
1474   "List of articles in the current newsgroup that can be processed.")
1475
1476 (defvar gnus-newsgroup-downloadable nil
1477   "Sorted list of articles in the current newsgroup that can be processed.")
1478
1479 (defvar gnus-newsgroup-unfetched nil
1480   "Sorted list of articles in the current newsgroup whose headers have
1481 not been fetched into the agent.
1482
1483 This list will always be a subset of gnus-newsgroup-undownloaded.")
1484
1485 (defvar gnus-newsgroup-undownloaded nil
1486   "List of articles in the current newsgroup that haven't been downloaded.")
1487
1488 (defvar gnus-newsgroup-unsendable nil
1489   "List of articles in the current newsgroup that won't be sent.")
1490
1491 (defvar gnus-newsgroup-bookmarks nil
1492   "List of articles in the current newsgroup that have bookmarks.")
1493
1494 (defvar gnus-newsgroup-dormant nil
1495   "Sorted list of dormant articles in the current newsgroup.")
1496
1497 (defvar gnus-newsgroup-unseen nil
1498   "List of unseen articles in the current newsgroup.")
1499
1500 (defvar gnus-newsgroup-seen nil
1501   "Range of seen articles in the current newsgroup.")
1502
1503 (defvar gnus-newsgroup-articles nil
1504   "List of articles in the current newsgroup.")
1505
1506 (defvar gnus-newsgroup-scored nil
1507   "List of scored articles in the current newsgroup.")
1508
1509 (defvar gnus-newsgroup-headers nil
1510   "List of article headers in the current newsgroup.")
1511
1512 (defvar gnus-newsgroup-threads nil)
1513
1514 (defvar gnus-newsgroup-prepared nil
1515   "Whether the current group has been prepared properly.")
1516
1517 (defvar gnus-newsgroup-ancient nil
1518   "List of `gnus-fetch-old-headers' articles in the current newsgroup.")
1519
1520 (defvar gnus-newsgroup-sparse nil)
1521
1522 (defvar gnus-current-article nil)
1523 (defvar gnus-article-current nil)
1524 (defvar gnus-current-headers nil)
1525 (defvar gnus-have-all-headers nil)
1526 (defvar gnus-last-article nil)
1527 (defvar gnus-newsgroup-history nil)
1528 (defvar gnus-newsgroup-charset nil)
1529 (defvar gnus-newsgroup-ephemeral-charset nil)
1530 (defvar gnus-newsgroup-ephemeral-ignored-charsets nil)
1531
1532 (defvar gnus-article-before-search nil)
1533
1534 (defvar gnus-summary-local-variables
1535   '(gnus-newsgroup-name
1536     gnus-newsgroup-begin gnus-newsgroup-end
1537     gnus-newsgroup-last-rmail gnus-newsgroup-last-mail
1538     gnus-newsgroup-last-folder gnus-newsgroup-last-file
1539     gnus-newsgroup-last-directory
1540     gnus-newsgroup-auto-expire gnus-newsgroup-unreads
1541     gnus-newsgroup-unselected gnus-newsgroup-marked
1542     gnus-newsgroup-spam-marked
1543     gnus-newsgroup-reads gnus-newsgroup-saved
1544     gnus-newsgroup-replied gnus-newsgroup-forwarded
1545     gnus-newsgroup-recent
1546     gnus-newsgroup-expirable
1547     gnus-newsgroup-processable gnus-newsgroup-killed
1548     gnus-newsgroup-downloadable gnus-newsgroup-undownloaded
1549     gnus-newsgroup-unfetched
1550     gnus-newsgroup-unsendable gnus-newsgroup-unseen
1551     gnus-newsgroup-seen gnus-newsgroup-articles
1552     gnus-newsgroup-bookmarks gnus-newsgroup-dormant
1553     gnus-newsgroup-headers gnus-newsgroup-threads
1554     gnus-newsgroup-prepared gnus-summary-highlight-line-function
1555     gnus-current-article gnus-current-headers gnus-have-all-headers
1556     gnus-last-article gnus-article-internal-prepare-hook
1557     gnus-newsgroup-dependencies gnus-newsgroup-selected-overlay
1558     gnus-newsgroup-scored gnus-newsgroup-kill-headers
1559     gnus-thread-expunge-below
1560     gnus-score-alist gnus-current-score-file
1561     (gnus-summary-expunge-below . global)
1562     (gnus-summary-mark-below . global)
1563     (gnus-orphan-score . global)
1564     gnus-newsgroup-active gnus-scores-exclude-files
1565     gnus-newsgroup-history gnus-newsgroup-ancient
1566     gnus-newsgroup-sparse gnus-newsgroup-process-stack
1567     (gnus-newsgroup-adaptive . gnus-use-adaptive-scoring)
1568     gnus-newsgroup-adaptive-score-file (gnus-reffed-article-number . -1)
1569     (gnus-newsgroup-expunged-tally . 0)
1570     gnus-cache-removable-articles gnus-newsgroup-cached
1571     gnus-newsgroup-data gnus-newsgroup-data-reverse
1572     gnus-newsgroup-limit gnus-newsgroup-limits
1573     gnus-newsgroup-charset gnus-newsgroup-display
1574     gnus-summary-use-undownloaded-faces)
1575   "Variables that are buffer-local to the summary buffers.")
1576
1577 (defvar gnus-newsgroup-variables nil
1578   "A list of variables that have separate values in different newsgroups.
1579 A list of newsgroup (summary buffer) local variables, or cons of
1580 variables and their default expressions to be evalled (when the default
1581 values are not nil), that should be made global while the summary buffer
1582 is active.
1583
1584 Note: The default expressions will be evaluated (using function `eval')
1585 before assignment to the local variable rather than just assigned to it.
1586 If the default expression is the symbol `global', that symbol will not
1587 be evaluated but the global value of the local variable will be used
1588 instead.
1589
1590 These variables can be used to set variables in the group parameters
1591 while still allowing them to affect operations done in other buffers.
1592 For example:
1593
1594 \(setq gnus-newsgroup-variables
1595      '(message-use-followup-to
1596        (gnus-visible-headers .
1597          \"^From:\\\\|^Newsgroups:\\\\|^Subject:\\\\|^Date:\\\\|^To:\")))
1598 ")
1599
1600 (eval-when-compile
1601   ;; Bind features so that require will believe that gnus-sum has
1602   ;; already been loaded (avoids infinite recursion)
1603   (let ((features (cons 'gnus-sum features)))
1604     (require 'gnus-art)))
1605
1606 ;; MIME stuff.
1607
1608 (defvar gnus-decode-encoded-word-methods
1609   '(mail-decode-encoded-word-string)
1610   "List of methods used to decode encoded words.
1611
1612 This variable is a list of FUNCTION or (REGEXP . FUNCTION).  If item
1613 is FUNCTION, FUNCTION will be apply to all newsgroups.  If item is a
1614 \(REGEXP . FUNCTION), FUNCTION will be only apply to thes newsgroups
1615 whose names match REGEXP.
1616
1617 For example:
1618 \((\"chinese\" . gnus-decode-encoded-word-string-by-guess)
1619  mail-decode-encoded-word-string
1620  (\"chinese\" . rfc1843-decode-string))")
1621
1622 (defvar gnus-decode-encoded-word-methods-cache nil)
1623
1624 (defun gnus-multi-decode-encoded-word-string (string)
1625   "Apply the functions from `gnus-encoded-word-methods' that match."
1626   (unless (and gnus-decode-encoded-word-methods-cache
1627                (eq gnus-newsgroup-name
1628                    (car gnus-decode-encoded-word-methods-cache)))
1629     (setq gnus-decode-encoded-word-methods-cache (list gnus-newsgroup-name))
1630     (dolist (method gnus-decode-encoded-word-methods)
1631       (if (symbolp method)
1632           (nconc gnus-decode-encoded-word-methods-cache (list method))
1633         (if (and gnus-newsgroup-name
1634                  (string-match (car method) gnus-newsgroup-name))
1635             (nconc gnus-decode-encoded-word-methods-cache
1636                    (list (cdr method)))))))
1637   (dolist (method (cdr gnus-decode-encoded-word-methods-cache) string)
1638     (setq string (funcall method string))))
1639
1640 ;; Subject simplification.
1641
1642 (defun gnus-simplify-whitespace (str)
1643   "Remove excessive whitespace from STR."
1644   ;; Multiple spaces.
1645   (while (string-match "[ \t][ \t]+" str)
1646     (setq str (concat (substring str 0 (match-beginning 0))
1647                         " "
1648                         (substring str (match-end 0)))))
1649   ;; Leading spaces.
1650   (when (string-match "^[ \t]+" str)
1651     (setq str (substring str (match-end 0))))
1652   ;; Trailing spaces.
1653   (when (string-match "[ \t]+$" str)
1654     (setq str (substring str 0 (match-beginning 0))))
1655   str)
1656
1657 (defun gnus-simplify-all-whitespace (str)
1658   "Remove all whitespace from STR."
1659   (while (string-match "[ \t\n]+" str)
1660     (setq str (replace-match "" nil nil str)))
1661   str)
1662
1663 (defsubst gnus-simplify-subject-re (subject)
1664   "Remove \"Re:\" from subject lines."
1665   (if (string-match message-subject-re-regexp subject)
1666       (substring subject (match-end 0))
1667     subject))
1668
1669 (defun gnus-simplify-subject (subject &optional re-only)
1670   "Remove `Re:' and words in parentheses.
1671 If RE-ONLY is non-nil, strip leading `Re:'s only."
1672   (let ((case-fold-search t))           ;Ignore case.
1673     ;; Remove `Re:', `Re^N:', `Re(n)', and `Re[n]:'.
1674     (when (string-match "\\`\\(re\\([[(^][0-9]+[])]?\\)?:[ \t]*\\)+" subject)
1675       (setq subject (substring subject (match-end 0))))
1676     ;; Remove uninteresting prefixes.
1677     (when (and (not re-only)
1678                gnus-simplify-ignored-prefixes
1679                (string-match gnus-simplify-ignored-prefixes subject))
1680       (setq subject (substring subject (match-end 0))))
1681     ;; Remove words in parentheses from end.
1682     (unless re-only
1683       (while (string-match "[ \t\n]*([^()]*)[ \t\n]*\\'" subject)
1684         (setq subject (substring subject 0 (match-beginning 0)))))
1685     ;; Return subject string.
1686     subject))
1687
1688 ;; Remove any leading "re:"s, any trailing paren phrases, and simplify
1689 ;; all whitespace.
1690 (defsubst gnus-simplify-buffer-fuzzy-step (regexp &optional newtext)
1691   (goto-char (point-min))
1692   (while (re-search-forward regexp nil t)
1693     (replace-match (or newtext ""))))
1694
1695 (defun gnus-simplify-buffer-fuzzy ()
1696   "Simplify string in the buffer fuzzily.
1697 The string in the accessible portion of the current buffer is simplified.
1698 It is assumed to be a single-line subject.
1699 Whitespace is generally cleaned up, and miscellaneous leading/trailing
1700 matter is removed.  Additional things can be deleted by setting
1701 `gnus-simplify-subject-fuzzy-regexp'."
1702   (let ((case-fold-search t)
1703         (modified-tick))
1704     (gnus-simplify-buffer-fuzzy-step "\t" " ")
1705
1706     (while (not (eq modified-tick (buffer-modified-tick)))
1707       (setq modified-tick (buffer-modified-tick))
1708       (cond
1709        ((listp gnus-simplify-subject-fuzzy-regexp)
1710         (mapc 'gnus-simplify-buffer-fuzzy-step
1711               gnus-simplify-subject-fuzzy-regexp))
1712        (gnus-simplify-subject-fuzzy-regexp
1713         (gnus-simplify-buffer-fuzzy-step gnus-simplify-subject-fuzzy-regexp)))
1714       (gnus-simplify-buffer-fuzzy-step "^ *\\[[-+?*!][-+?*!]\\] *")
1715       (gnus-simplify-buffer-fuzzy-step
1716        "^ *\\(re\\|fw\\|fwd\\)[[{(^0-9]*[])}]?[:;] *")
1717       (gnus-simplify-buffer-fuzzy-step "^[[].*:\\( .*\\)[]]$" "\\1"))
1718
1719     (gnus-simplify-buffer-fuzzy-step " *[[{(][^()\n]*[]})] *$")
1720     (gnus-simplify-buffer-fuzzy-step "  +" " ")
1721     (gnus-simplify-buffer-fuzzy-step " $")
1722     (gnus-simplify-buffer-fuzzy-step "^ +")))
1723
1724 (defun gnus-simplify-subject-fuzzy (subject)
1725   "Simplify a subject string fuzzily.
1726 See `gnus-simplify-buffer-fuzzy' for details."
1727   (save-excursion
1728     (gnus-set-work-buffer)
1729     (let ((case-fold-search t))
1730       ;; Remove uninteresting prefixes.
1731       (when (and gnus-simplify-ignored-prefixes
1732                  (string-match gnus-simplify-ignored-prefixes subject))
1733         (setq subject (substring subject (match-end 0))))
1734       (insert subject)
1735       (inline (gnus-simplify-buffer-fuzzy))
1736       (buffer-string))))
1737
1738 (defsubst gnus-simplify-subject-fully (subject)
1739   "Simplify a subject string according to `gnus-summary-gather-subject-limit'."
1740   (cond
1741    (gnus-simplify-subject-functions
1742     (gnus-map-function gnus-simplify-subject-functions subject))
1743    ((null gnus-summary-gather-subject-limit)
1744     (gnus-simplify-subject-re subject))
1745    ((eq gnus-summary-gather-subject-limit 'fuzzy)
1746     (gnus-simplify-subject-fuzzy subject))
1747    ((numberp gnus-summary-gather-subject-limit)
1748     (truncate-string-to-width (gnus-simplify-subject-re subject)
1749                               gnus-summary-gather-subject-limit))
1750    (t
1751     subject)))
1752
1753 (defsubst gnus-subject-equal (s1 s2 &optional simple-first)
1754   "Check whether two subjects are equal.
1755 If optional argument SIMPLE-FIRST is t, first argument is already
1756 simplified."
1757   (cond
1758    ((null simple-first)
1759     (equal (gnus-simplify-subject-fully s1)
1760            (gnus-simplify-subject-fully s2)))
1761    (t
1762     (equal s1
1763            (gnus-simplify-subject-fully s2)))))
1764
1765 (defun gnus-summary-bubble-group ()
1766   "Increase the score of the current group.
1767 This is a handy function to add to `gnus-summary-exit-hook' to
1768 increase the score of each group you read."
1769   (gnus-group-add-score gnus-newsgroup-name))
1770
1771 \f
1772 ;;;
1773 ;;; Gnus summary mode
1774 ;;;
1775
1776 (put 'gnus-summary-mode 'mode-class 'special)
1777
1778 (defvar gnus-article-commands-menu)
1779
1780 ;; Non-orthogonal keys
1781
1782 (gnus-define-keys gnus-summary-mode-map
1783   " " gnus-summary-next-page
1784   "\177" gnus-summary-prev-page
1785   [delete] gnus-summary-prev-page
1786   [backspace] gnus-summary-prev-page
1787   "\r" gnus-summary-scroll-up
1788   "\M-\r" gnus-summary-scroll-down
1789   "n" gnus-summary-next-unread-article
1790   "p" gnus-summary-prev-unread-article
1791   "N" gnus-summary-next-article
1792   "P" gnus-summary-prev-article
1793   "\M-\C-n" gnus-summary-next-same-subject
1794   "\M-\C-p" gnus-summary-prev-same-subject
1795   "\M-n" gnus-summary-next-unread-subject
1796   "\M-p" gnus-summary-prev-unread-subject
1797   "." gnus-summary-first-unread-article
1798   "," gnus-summary-best-unread-article
1799   "\M-s" gnus-summary-search-article-forward
1800   "\M-r" gnus-summary-search-article-backward
1801   "\M-S" gnus-summary-repeat-search-article-forward
1802   "\M-R" gnus-summary-repeat-search-article-backward
1803   "<" gnus-summary-beginning-of-article
1804   ">" gnus-summary-end-of-article
1805   "j" gnus-summary-goto-article
1806   "^" gnus-summary-refer-parent-article
1807   "\M-^" gnus-summary-refer-article
1808   "u" gnus-summary-tick-article-forward
1809   "!" gnus-summary-tick-article-forward
1810   "U" gnus-summary-tick-article-backward
1811   "d" gnus-summary-mark-as-read-forward
1812   "D" gnus-summary-mark-as-read-backward
1813   "E" gnus-summary-mark-as-expirable
1814   "\M-u" gnus-summary-clear-mark-forward
1815   "\M-U" gnus-summary-clear-mark-backward
1816   "k" gnus-summary-kill-same-subject-and-select
1817   "\C-k" gnus-summary-kill-same-subject
1818   "\M-\C-k" gnus-summary-kill-thread
1819   "\M-\C-l" gnus-summary-lower-thread
1820   "e" gnus-summary-edit-article
1821   "#" gnus-summary-mark-as-processable
1822   "\M-#" gnus-summary-unmark-as-processable
1823   "\M-\C-t" gnus-summary-toggle-threads
1824   "\M-\C-s" gnus-summary-show-thread
1825   "\M-\C-h" gnus-summary-hide-thread
1826   "\M-\C-f" gnus-summary-next-thread
1827   "\M-\C-b" gnus-summary-prev-thread
1828   [(meta down)] gnus-summary-next-thread
1829   [(meta up)] gnus-summary-prev-thread
1830   "\M-\C-u" gnus-summary-up-thread
1831   "\M-\C-d" gnus-summary-down-thread
1832   "&" gnus-summary-execute-command
1833   "c" gnus-summary-catchup-and-exit
1834   "\C-w" gnus-summary-mark-region-as-read
1835   "\C-t" gnus-summary-toggle-truncation
1836   "?" gnus-summary-mark-as-dormant
1837   "\C-c\M-\C-s" gnus-summary-limit-include-expunged
1838   "\C-c\C-s\C-n" gnus-summary-sort-by-number
1839   "\C-c\C-s\C-m\C-n" gnus-summary-sort-by-most-recent-number
1840   "\C-c\C-s\C-l" gnus-summary-sort-by-lines
1841   "\C-c\C-s\C-c" gnus-summary-sort-by-chars
1842   "\C-c\C-s\C-a" gnus-summary-sort-by-author
1843   "\C-c\C-s\C-t" gnus-summary-sort-by-recipient
1844   "\C-c\C-s\C-s" gnus-summary-sort-by-subject
1845   "\C-c\C-s\C-d" gnus-summary-sort-by-date
1846   "\C-c\C-s\C-m\C-d" gnus-summary-sort-by-most-recent-date
1847   "\C-c\C-s\C-i" gnus-summary-sort-by-score
1848   "\C-c\C-s\C-o" gnus-summary-sort-by-original
1849   "\C-c\C-s\C-r" gnus-summary-sort-by-random
1850   "=" gnus-summary-expand-window
1851   "\C-x\C-s" gnus-summary-reselect-current-group
1852   "\M-g" gnus-summary-rescan-group
1853   "w" gnus-summary-stop-page-breaking
1854   "\C-c\C-r" gnus-summary-caesar-message
1855   "f" gnus-summary-followup
1856   "F" gnus-summary-followup-with-original
1857   "C" gnus-summary-cancel-article
1858   "r" gnus-summary-reply
1859   "R" gnus-summary-reply-with-original
1860   "\C-c\C-f" gnus-summary-mail-forward
1861   "o" gnus-summary-save-article
1862   "\C-o" gnus-summary-save-article-mail
1863   "|" gnus-summary-pipe-output
1864   "\M-k" gnus-summary-edit-local-kill
1865   "\M-K" gnus-summary-edit-global-kill
1866   ;; "V" gnus-version
1867   "\C-c\C-d" gnus-summary-describe-group
1868   "q" gnus-summary-exit
1869   "Q" gnus-summary-exit-no-update
1870   "\C-c\C-i" gnus-info-find-node
1871   gnus-mouse-2 gnus-mouse-pick-article
1872   [follow-link] mouse-face
1873   "m" gnus-summary-mail-other-window
1874   "a" gnus-summary-post-news
1875   "i" gnus-summary-news-other-window
1876   "x" gnus-summary-limit-to-unread
1877   "s" gnus-summary-isearch-article
1878   "t" gnus-summary-toggle-header
1879   "g" gnus-summary-show-article
1880   "l" gnus-summary-goto-last-article
1881   "\C-c\C-v\C-v" gnus-uu-decode-uu-view
1882   "\C-d" gnus-summary-enter-digest-group
1883   "\M-\C-d" gnus-summary-read-document
1884   "\M-\C-e" gnus-summary-edit-parameters
1885   "\M-\C-a" gnus-summary-customize-parameters
1886   "\C-c\C-b" gnus-bug
1887   "*" gnus-cache-enter-article
1888   "\M-*" gnus-cache-remove-article
1889   "\M-&" gnus-summary-universal-argument
1890   "\C-l" gnus-recenter
1891   "I" gnus-summary-increase-score
1892   "L" gnus-summary-lower-score
1893   "\M-i" gnus-symbolic-argument
1894   "h" gnus-summary-select-article-buffer
1895
1896   "b" gnus-article-view-part
1897   "\M-t" gnus-summary-toggle-display-buttonized
1898
1899   "V" gnus-summary-score-map
1900   "X" gnus-uu-extract-map
1901   "S" gnus-summary-send-map)
1902
1903 ;; Sort of orthogonal keymap
1904 (gnus-define-keys (gnus-summary-mark-map "M" gnus-summary-mode-map)
1905   "t" gnus-summary-tick-article-forward
1906   "!" gnus-summary-tick-article-forward
1907   "d" gnus-summary-mark-as-read-forward
1908   "r" gnus-summary-mark-as-read-forward
1909   "c" gnus-summary-clear-mark-forward
1910   " " gnus-summary-clear-mark-forward
1911   "e" gnus-summary-mark-as-expirable
1912   "x" gnus-summary-mark-as-expirable
1913   "?" gnus-summary-mark-as-dormant
1914   "b" gnus-summary-set-bookmark
1915   "B" gnus-summary-remove-bookmark
1916   "#" gnus-summary-mark-as-processable
1917   "\M-#" gnus-summary-unmark-as-processable
1918   "S" gnus-summary-limit-include-expunged
1919   "C" gnus-summary-catchup
1920   "H" gnus-summary-catchup-to-here
1921   "h" gnus-summary-catchup-from-here
1922   "\C-c" gnus-summary-catchup-all
1923   "k" gnus-summary-kill-same-subject-and-select
1924   "K" gnus-summary-kill-same-subject
1925   "P" gnus-uu-mark-map)
1926
1927 (gnus-define-keys (gnus-summary-mscore-map "V" gnus-summary-mark-map)
1928   "c" gnus-summary-clear-above
1929   "u" gnus-summary-tick-above
1930   "m" gnus-summary-mark-above
1931   "k" gnus-summary-kill-below)
1932
1933 (gnus-define-keys (gnus-summary-limit-map "/" gnus-summary-mode-map)
1934   "/" gnus-summary-limit-to-subject
1935   "n" gnus-summary-limit-to-articles
1936   "b" gnus-summary-limit-to-bodies
1937   "h" gnus-summary-limit-to-headers
1938   "w" gnus-summary-pop-limit
1939   "s" gnus-summary-limit-to-subject
1940   "a" gnus-summary-limit-to-author
1941   "u" gnus-summary-limit-to-unread
1942   "m" gnus-summary-limit-to-marks
1943   "M" gnus-summary-limit-exclude-marks
1944   "v" gnus-summary-limit-to-score
1945   "*" gnus-summary-limit-include-cached
1946   "D" gnus-summary-limit-include-dormant
1947   "T" gnus-summary-limit-include-thread
1948   "d" gnus-summary-limit-exclude-dormant
1949   "t" gnus-summary-limit-to-age
1950   "." gnus-summary-limit-to-unseen
1951   "x" gnus-summary-limit-to-extra
1952   "p" gnus-summary-limit-to-display-predicate
1953   "E" gnus-summary-limit-include-expunged
1954   "c" gnus-summary-limit-exclude-childless-dormant
1955   "C" gnus-summary-limit-mark-excluded-as-read
1956   "o" gnus-summary-insert-old-articles
1957   "N" gnus-summary-insert-new-articles
1958   "S" gnus-summary-limit-to-singletons
1959   "r" gnus-summary-limit-to-replied
1960   "R" gnus-summary-limit-to-recipient
1961   "A" gnus-summary-limit-to-address)
1962
1963 (gnus-define-keys (gnus-summary-goto-map "G" gnus-summary-mode-map)
1964   "n" gnus-summary-next-unread-article
1965   "p" gnus-summary-prev-unread-article
1966   "N" gnus-summary-next-article
1967   "P" gnus-summary-prev-article
1968   "\C-n" gnus-summary-next-same-subject
1969   "\C-p" gnus-summary-prev-same-subject
1970   "\M-n" gnus-summary-next-unread-subject
1971   "\M-p" gnus-summary-prev-unread-subject
1972   "f" gnus-summary-first-unread-article
1973   "b" gnus-summary-best-unread-article
1974   "j" gnus-summary-goto-article
1975   "g" gnus-summary-goto-subject
1976   "l" gnus-summary-goto-last-article
1977   "o" gnus-summary-pop-article)
1978
1979 (gnus-define-keys (gnus-summary-thread-map "T" gnus-summary-mode-map)
1980   "k" gnus-summary-kill-thread
1981   "E" gnus-summary-expire-thread
1982   "l" gnus-summary-lower-thread
1983   "i" gnus-summary-raise-thread
1984   "T" gnus-summary-toggle-threads
1985   "t" gnus-summary-rethread-current
1986   "^" gnus-summary-reparent-thread
1987   "\M-^" gnus-summary-reparent-children
1988   "s" gnus-summary-show-thread
1989   "S" gnus-summary-show-all-threads
1990   "h" gnus-summary-hide-thread
1991   "H" gnus-summary-hide-all-threads
1992   "n" gnus-summary-next-thread
1993   "p" gnus-summary-prev-thread
1994   "u" gnus-summary-up-thread
1995   "o" gnus-summary-top-thread
1996   "d" gnus-summary-down-thread
1997   "#" gnus-uu-mark-thread
1998   "\M-#" gnus-uu-unmark-thread)
1999
2000 (gnus-define-keys (gnus-summary-buffer-map "Y" gnus-summary-mode-map)
2001   "g" gnus-summary-prepare
2002   "c" gnus-summary-insert-cached-articles
2003   "d" gnus-summary-insert-dormant-articles
2004   "t" gnus-summary-insert-ticked-articles)
2005
2006 (gnus-define-keys (gnus-summary-exit-map "Z" gnus-summary-mode-map)
2007   "c" gnus-summary-catchup-and-exit
2008   "C" gnus-summary-catchup-all-and-exit
2009   "E" gnus-summary-exit-no-update
2010   "Q" gnus-summary-exit
2011   "Z" gnus-summary-exit
2012   "n" gnus-summary-catchup-and-goto-next-group
2013   "p" gnus-summary-catchup-and-goto-prev-group
2014   "R" gnus-summary-reselect-current-group
2015   "G" gnus-summary-rescan-group
2016   "N" gnus-summary-next-group
2017   "s" gnus-summary-save-newsrc
2018   "P" gnus-summary-prev-group)
2019
2020 (gnus-define-keys (gnus-summary-article-map "A" gnus-summary-mode-map)
2021   " " gnus-summary-next-page
2022   "n" gnus-summary-next-page
2023   "\177" gnus-summary-prev-page
2024   [delete] gnus-summary-prev-page
2025   "p" gnus-summary-prev-page
2026   "\r" gnus-summary-scroll-up
2027   "\M-\r" gnus-summary-scroll-down
2028   "<" gnus-summary-beginning-of-article
2029   ">" gnus-summary-end-of-article
2030   "b" gnus-summary-beginning-of-article
2031   "e" gnus-summary-end-of-article
2032   "^" gnus-summary-refer-parent-article
2033   "r" gnus-summary-refer-parent-article
2034   "D" gnus-summary-enter-digest-group
2035   "R" gnus-summary-refer-references
2036   "T" gnus-summary-refer-thread
2037   "g" gnus-summary-show-article
2038   "s" gnus-summary-isearch-article
2039   "P" gnus-summary-print-article
2040   "S" gnus-sticky-article
2041   "M" gnus-mailing-list-insinuate
2042   "t" gnus-article-babel)
2043
2044 (gnus-define-keys (gnus-summary-wash-map "W" gnus-summary-mode-map)
2045   "b" gnus-article-add-buttons
2046   "B" gnus-article-add-buttons-to-head
2047   "o" gnus-article-treat-overstrike
2048   "e" gnus-article-emphasize
2049   "w" gnus-article-fill-cited-article
2050   "Q" gnus-article-fill-long-lines
2051   "L" gnus-article-toggle-truncate-lines
2052   "C" gnus-article-capitalize-sentences
2053   "c" gnus-article-remove-cr
2054   "q" gnus-article-de-quoted-unreadable
2055   "6" gnus-article-de-base64-unreadable
2056   "Z" gnus-article-decode-HZ
2057   "A" gnus-article-treat-ansi-sequences
2058   "h" gnus-article-wash-html
2059   "u" gnus-article-unsplit-urls
2060   "s" gnus-summary-force-verify-and-decrypt
2061   "f" gnus-article-display-x-face
2062   "l" gnus-summary-stop-page-breaking
2063   "r" gnus-summary-caesar-message
2064   "m" gnus-summary-morse-message
2065   "t" gnus-summary-toggle-header
2066   "g" gnus-treat-smiley
2067   "v" gnus-summary-verbose-headers
2068   "a" gnus-article-strip-headers-in-body ;; mnemonic: wash archive
2069   "p" gnus-article-verify-x-pgp-sig
2070   "d" gnus-article-treat-dumbquotes
2071   "i" gnus-summary-idna-message)
2072
2073 (gnus-define-keys (gnus-summary-wash-deuglify-map "Y" gnus-summary-wash-map)
2074   ;; mnemonic: deuglif*Y*
2075   "u" gnus-article-outlook-unwrap-lines
2076   "a" gnus-article-outlook-repair-attribution
2077   "c" gnus-article-outlook-rearrange-citation
2078   "f" gnus-article-outlook-deuglify-article) ;; mnemonic: full deuglify
2079
2080 (gnus-define-keys (gnus-summary-wash-hide-map "W" gnus-summary-wash-map)
2081   "a" gnus-article-hide
2082   "h" gnus-article-hide-headers
2083   "b" gnus-article-hide-boring-headers
2084   "s" gnus-article-hide-signature
2085   "c" gnus-article-hide-citation
2086   "C" gnus-article-hide-citation-in-followups
2087   "l" gnus-article-hide-list-identifiers
2088   "B" gnus-article-strip-banner
2089   "P" gnus-article-hide-pem
2090   "\C-c" gnus-article-hide-citation-maybe)
2091
2092 (gnus-define-keys (gnus-summary-wash-highlight-map "H" gnus-summary-wash-map)
2093   "a" gnus-article-highlight
2094   "h" gnus-article-highlight-headers
2095   "c" gnus-article-highlight-citation
2096   "s" gnus-article-highlight-signature)
2097
2098 (gnus-define-keys (gnus-summary-wash-header-map "G" gnus-summary-wash-map)
2099   "f" gnus-article-treat-fold-headers
2100   "u" gnus-article-treat-unfold-headers
2101   "n" gnus-article-treat-fold-newsgroups)
2102
2103 (gnus-define-keys (gnus-summary-wash-display-map "D" gnus-summary-wash-map)
2104   "x" gnus-article-display-x-face
2105   "d" gnus-article-display-face
2106   "s" gnus-treat-smiley
2107   "D" gnus-article-remove-images
2108   "f" gnus-treat-from-picon
2109   "m" gnus-treat-mail-picon
2110   "n" gnus-treat-newsgroups-picon)
2111
2112 (gnus-define-keys (gnus-summary-wash-mime-map "M" gnus-summary-wash-map)
2113   "w" gnus-article-decode-mime-words
2114   "c" gnus-article-decode-charset
2115   "v" gnus-mime-view-all-parts
2116   "b" gnus-article-view-part)
2117
2118 (gnus-define-keys (gnus-summary-wash-time-map "T" gnus-summary-wash-map)
2119   "z" gnus-article-date-ut
2120   "u" gnus-article-date-ut
2121   "l" gnus-article-date-local
2122   "p" gnus-article-date-english
2123   "e" gnus-article-date-lapsed
2124   "o" gnus-article-date-original
2125   "i" gnus-article-date-iso8601
2126   "s" gnus-article-date-user)
2127
2128 (gnus-define-keys (gnus-summary-wash-empty-map "E" gnus-summary-wash-map)
2129   "t" gnus-article-remove-trailing-blank-lines
2130   "l" gnus-article-strip-leading-blank-lines
2131   "m" gnus-article-strip-multiple-blank-lines
2132   "a" gnus-article-strip-blank-lines
2133   "A" gnus-article-strip-all-blank-lines
2134   "s" gnus-article-strip-leading-space
2135   "e" gnus-article-strip-trailing-space
2136   "w" gnus-article-remove-leading-whitespace)
2137
2138 (gnus-define-keys (gnus-summary-help-map "H" gnus-summary-mode-map)
2139   "v" gnus-version
2140   "f" gnus-summary-fetch-faq
2141   "d" gnus-summary-describe-group
2142   "h" gnus-summary-describe-briefly
2143   "i" gnus-info-find-node
2144   "c" gnus-group-fetch-charter
2145   "C" gnus-group-fetch-control)
2146
2147 (gnus-define-keys (gnus-summary-backend-map "B" gnus-summary-mode-map)
2148   "e" gnus-summary-expire-articles
2149   "\M-\C-e" gnus-summary-expire-articles-now
2150   "\177" gnus-summary-delete-article
2151   [delete] gnus-summary-delete-article
2152   [backspace] gnus-summary-delete-article
2153   "m" gnus-summary-move-article
2154   "r" gnus-summary-respool-article
2155   "w" gnus-summary-edit-article
2156   "c" gnus-summary-copy-article
2157   "B" gnus-summary-crosspost-article
2158   "q" gnus-summary-respool-query
2159   "t" gnus-summary-respool-trace
2160   "i" gnus-summary-import-article
2161   "I" gnus-summary-create-article
2162   "p" gnus-summary-article-posted-p)
2163
2164 (gnus-define-keys (gnus-summary-save-map "O" gnus-summary-mode-map)
2165   "o" gnus-summary-save-article
2166   "m" gnus-summary-save-article-mail
2167   "F" gnus-summary-write-article-file
2168   "r" gnus-summary-save-article-rmail
2169   "f" gnus-summary-save-article-file
2170   "b" gnus-summary-save-article-body-file
2171   "B" gnus-summary-write-article-body-file
2172   "h" gnus-summary-save-article-folder
2173   "v" gnus-summary-save-article-vm
2174   "p" gnus-summary-pipe-output
2175   "P" gnus-summary-muttprint
2176   "s" gnus-soup-add-article)
2177
2178 (gnus-define-keys (gnus-summary-mime-map "K" gnus-summary-mode-map)
2179   "b" gnus-summary-display-buttonized
2180   "m" gnus-summary-repair-multipart
2181   "v" gnus-article-view-part
2182   "o" gnus-article-save-part
2183   "O" gnus-article-save-part-and-strip
2184   "r" gnus-article-replace-part
2185   "d" gnus-article-delete-part
2186   "t" gnus-article-view-part-as-type
2187   "j" gnus-article-jump-to-part
2188   "c" gnus-article-copy-part
2189   "C" gnus-article-view-part-as-charset
2190   "e" gnus-article-view-part-externally
2191   "H" gnus-article-browse-html-article
2192   "E" gnus-article-encrypt-body
2193   "i" gnus-article-inline-part
2194   "|" gnus-article-pipe-part)
2195
2196 (gnus-define-keys (gnus-uu-mark-map "P" gnus-summary-mark-map)
2197   "p" gnus-summary-mark-as-processable
2198   "u" gnus-summary-unmark-as-processable
2199   "U" gnus-summary-unmark-all-processable
2200   "v" gnus-uu-mark-over
2201   "s" gnus-uu-mark-series
2202   "r" gnus-uu-mark-region
2203   "g" gnus-uu-unmark-region
2204   "R" gnus-uu-mark-by-regexp
2205   "G" gnus-uu-unmark-by-regexp
2206   "t" gnus-uu-mark-thread
2207   "T" gnus-uu-unmark-thread
2208   "a" gnus-uu-mark-all
2209   "b" gnus-uu-mark-buffer
2210   "S" gnus-uu-mark-sparse
2211   "k" gnus-summary-kill-process-mark
2212   "y" gnus-summary-yank-process-mark
2213   "w" gnus-summary-save-process-mark
2214   "i" gnus-uu-invert-processable)
2215
2216 (gnus-define-keys (gnus-uu-extract-map "X" gnus-summary-mode-map)
2217   ;;"x" gnus-uu-extract-any
2218   "m" gnus-summary-save-parts
2219   "u" gnus-uu-decode-uu
2220   "U" gnus-uu-decode-uu-and-save
2221   "s" gnus-uu-decode-unshar
2222   "S" gnus-uu-decode-unshar-and-save
2223   "o" gnus-uu-decode-save
2224   "O" gnus-uu-decode-save
2225   "b" gnus-uu-decode-binhex
2226   "B" gnus-uu-decode-binhex
2227   "Y" gnus-uu-decode-yenc
2228   "p" gnus-uu-decode-postscript
2229   "P" gnus-uu-decode-postscript-and-save)
2230
2231 (gnus-define-keys
2232     (gnus-uu-extract-view-map "v" gnus-uu-extract-map)
2233   "u" gnus-uu-decode-uu-view
2234   "U" gnus-uu-decode-uu-and-save-view
2235   "s" gnus-uu-decode-unshar-view
2236   "S" gnus-uu-decode-unshar-and-save-view
2237   "o" gnus-uu-decode-save-view
2238   "O" gnus-uu-decode-save-view
2239   "b" gnus-uu-decode-binhex-view
2240   "B" gnus-uu-decode-binhex-view
2241   "p" gnus-uu-decode-postscript-view
2242   "P" gnus-uu-decode-postscript-and-save-view)
2243
2244 (defvar gnus-article-post-menu nil)
2245
2246 (defconst gnus-summary-menu-maxlen 20)
2247
2248 (defun gnus-summary-menu-split (menu)
2249   ;; If we have lots of elements, divide them into groups of 20
2250   ;; and make a pane (or submenu) for each one.
2251   (if (> (length menu) (/ (* gnus-summary-menu-maxlen 3) 2))
2252       (let ((menu menu) sublists next
2253             (i 1))
2254         (while menu
2255           ;; Pull off the next gnus-summary-menu-maxlen elements
2256           ;; and make them the next element of sublist.
2257           (setq next (nthcdr gnus-summary-menu-maxlen menu))
2258           (if next
2259               (setcdr (nthcdr (1- gnus-summary-menu-maxlen) menu)
2260                       nil))
2261           (setq sublists (cons (cons (format "%s ... %s" (aref (car menu) 0)
2262                                              (aref (car (last menu)) 0)) menu)
2263                                sublists))
2264           (setq i (1+ i))
2265           (setq menu next))
2266         (nreverse sublists))
2267     ;; Few elements--put them all in one pane.
2268     menu))
2269
2270 (defun gnus-summary-make-menu-bar ()
2271   (gnus-turn-off-edit-menu 'summary)
2272
2273   (unless (boundp 'gnus-summary-misc-menu)
2274
2275     (easy-menu-define
2276       gnus-summary-kill-menu gnus-summary-mode-map ""
2277       (cons
2278        "Score"
2279        (nconc
2280         (list
2281          ["Customize" gnus-score-customize t])
2282         (gnus-make-score-map 'increase)
2283         (gnus-make-score-map 'lower)
2284         '(("Mark"
2285            ["Kill below" gnus-summary-kill-below t]
2286            ["Mark above" gnus-summary-mark-above t]
2287            ["Tick above" gnus-summary-tick-above t]
2288            ["Clear above" gnus-summary-clear-above t])
2289           ["Current score" gnus-summary-current-score t]
2290           ["Set score" gnus-summary-set-score t]
2291           ["Switch current score file..." gnus-score-change-score-file t]
2292           ["Set mark below..." gnus-score-set-mark-below t]
2293           ["Set expunge below..." gnus-score-set-expunge-below t]
2294           ["Edit current score file" gnus-score-edit-current-scores t]
2295           ["Edit score file..." gnus-score-edit-file t]
2296           ["Trace score" gnus-score-find-trace t]
2297           ["Find words" gnus-score-find-favourite-words t]
2298           ["Rescore buffer" gnus-summary-rescore t]
2299           ["Increase score..." gnus-summary-increase-score t]
2300           ["Lower score..." gnus-summary-lower-score t]))))
2301
2302     ;; Define both the Article menu in the summary buffer and the
2303     ;; equivalent Commands menu in the article buffer here for
2304     ;; consistency.
2305     (let ((innards
2306            `(("Hide"
2307               ["All" gnus-article-hide t]
2308               ["Headers" gnus-article-hide-headers t]
2309               ["Signature" gnus-article-hide-signature t]
2310               ["Citation" gnus-article-hide-citation t]
2311               ["List identifiers" gnus-article-hide-list-identifiers t]
2312               ["Banner" gnus-article-strip-banner t]
2313               ["Boring headers" gnus-article-hide-boring-headers t])
2314              ("Highlight"
2315               ["All" gnus-article-highlight t]
2316               ["Headers" gnus-article-highlight-headers t]
2317               ["Signature" gnus-article-highlight-signature t]
2318               ["Citation" gnus-article-highlight-citation t])
2319              ("MIME"
2320               ["Words" gnus-article-decode-mime-words t]
2321               ["Charset" gnus-article-decode-charset t]
2322               ["QP" gnus-article-de-quoted-unreadable t]
2323               ["Base64" gnus-article-de-base64-unreadable t]
2324               ["View MIME buttons" gnus-summary-display-buttonized t]
2325               ["View all" gnus-mime-view-all-parts t]
2326               ["Verify and Decrypt" gnus-summary-force-verify-and-decrypt t]
2327               ["Encrypt body" gnus-article-encrypt-body
2328                :active (not (gnus-group-read-only-p))
2329                ,@(if (featurep 'xemacs) nil
2330                    '(:help "Encrypt the message body on disk"))]
2331               ["Extract all parts..." gnus-summary-save-parts t]
2332               ("Multipart"
2333                ["Repair multipart" gnus-summary-repair-multipart t]
2334                ["Pipe part..." gnus-article-pipe-part t]
2335                ["Inline part" gnus-article-inline-part t]
2336                ["View part as type..." gnus-article-view-part-as-type t]
2337                ["Encrypt body" gnus-article-encrypt-body
2338                 :active (not (gnus-group-read-only-p))
2339                ,@(if (featurep 'xemacs) nil
2340                    '(:help "Encrypt the message body on disk"))]
2341                ["View part externally" gnus-article-view-part-externally t]
2342                ["View HTML parts in browser" gnus-article-browse-html-article t]
2343                ["View part with charset..." gnus-article-view-part-as-charset t]
2344                ["Copy part" gnus-article-copy-part t]
2345                ["Save part..." gnus-article-save-part t]
2346                ["View part" gnus-article-view-part t]))
2347              ("Date"
2348               ["Local" gnus-article-date-local t]
2349               ["ISO8601" gnus-article-date-iso8601 t]
2350               ["UT" gnus-article-date-ut t]
2351               ["Original" gnus-article-date-original t]
2352               ["Lapsed" gnus-article-date-lapsed t]
2353               ["User-defined" gnus-article-date-user t])
2354              ("Display"
2355               ["Remove images" gnus-article-remove-images t]
2356               ["Toggle smiley" gnus-treat-smiley t]
2357               ["Show X-Face" gnus-article-display-x-face t]
2358               ["Show picons in From" gnus-treat-from-picon t]
2359               ["Show picons in mail headers" gnus-treat-mail-picon t]
2360               ["Show picons in news headers" gnus-treat-newsgroups-picon t]
2361               ("View as different encoding"
2362                ,@(gnus-summary-menu-split
2363                   (mapcar
2364                    (lambda (cs)
2365                      ;; Since easymenu under Emacs doesn't allow
2366                      ;; lambda forms for menu commands, we should
2367                      ;; provide intern'ed function symbols.
2368                      (let ((command (intern (format "\
2369 gnus-summary-show-article-from-menu-as-charset-%s" cs))))
2370                        (fset command
2371                              `(lambda ()
2372                                 (interactive)
2373                                 (let ((gnus-summary-show-article-charset-alist
2374                                        '((1 . ,cs))))
2375                                   (gnus-summary-show-article 1))))
2376                        `[,(symbol-name cs) ,command t]))
2377                    (sort (if (fboundp 'coding-system-list)
2378                              (coding-system-list)
2379                            (mapcar 'car mm-mime-mule-charset-alist))
2380                          'string<)))))
2381              ("Washing"
2382               ("Remove Blanks"
2383                ["Leading" gnus-article-strip-leading-blank-lines t]
2384                ["Multiple" gnus-article-strip-multiple-blank-lines t]
2385                ["Trailing" gnus-article-remove-trailing-blank-lines t]
2386                ["All of the above" gnus-article-strip-blank-lines t]
2387                ["All" gnus-article-strip-all-blank-lines t]
2388                ["Leading space" gnus-article-strip-leading-space t]
2389                ["Trailing space" gnus-article-strip-trailing-space t]
2390                ["Leading space in headers"
2391                 gnus-article-remove-leading-whitespace t])
2392               ["Overstrike" gnus-article-treat-overstrike t]
2393               ["Dumb quotes" gnus-article-treat-dumbquotes t]
2394               ["Emphasis" gnus-article-emphasize t]
2395               ["Word wrap" gnus-article-fill-cited-article t]
2396               ["Fill long lines" gnus-article-fill-long-lines t]
2397               ["Toggle truncate long lines" gnus-article-toggle-truncate-lines t]
2398               ["Capitalize sentences" gnus-article-capitalize-sentences t]
2399               ["Remove CR" gnus-article-remove-cr t]
2400               ["Quoted-Printable" gnus-article-de-quoted-unreadable t]
2401               ["Base64" gnus-article-de-base64-unreadable t]
2402               ["Rot 13" gnus-summary-caesar-message
2403                ,@(if (featurep 'xemacs) '(t)
2404                    '(:help "\"Caesar rotate\" article by 13"))]
2405               ["De-IDNA" gnus-summary-idna-message t]
2406               ["Morse decode" gnus-summary-morse-message t]
2407               ["Unix pipe..." gnus-summary-pipe-message t]
2408               ["Add buttons" gnus-article-add-buttons t]
2409               ["Add buttons to head" gnus-article-add-buttons-to-head t]
2410               ["Stop page breaking" gnus-summary-stop-page-breaking t]
2411               ["Verbose header" gnus-summary-verbose-headers t]
2412               ["Toggle header" gnus-summary-toggle-header t]
2413               ["Unfold headers" gnus-article-treat-unfold-headers t]
2414               ["Fold newsgroups" gnus-article-treat-fold-newsgroups t]
2415               ["Html" gnus-article-wash-html t]
2416               ["Unsplit URLs" gnus-article-unsplit-urls t]
2417               ["Verify X-PGP-Sig" gnus-article-verify-x-pgp-sig t]
2418               ["Decode HZ" gnus-article-decode-HZ t]
2419               ["ANSI sequences" gnus-article-treat-ansi-sequences t]
2420               ("(Outlook) Deuglify"
2421                ["Unwrap lines" gnus-article-outlook-unwrap-lines t]
2422                ["Repair attribution" gnus-article-outlook-repair-attribution t]
2423                ["Rearrange citation" gnus-article-outlook-rearrange-citation t]
2424                ["Full (Outlook) deuglify"
2425                 gnus-article-outlook-deuglify-article t])
2426               )
2427              ("Output"
2428               ["Save in default format..." gnus-summary-save-article
2429                ,@(if (featurep 'xemacs) '(t)
2430                    '(:help "Save article using default method"))]
2431               ["Save in file..." gnus-summary-save-article-file
2432                ,@(if (featurep 'xemacs) '(t)
2433                    '(:help "Save article in file"))]
2434               ["Save in Unix mail format..." gnus-summary-save-article-mail t]
2435               ["Save in MH folder..." gnus-summary-save-article-folder t]
2436               ["Save in VM folder..." gnus-summary-save-article-vm t]
2437               ["Save in RMAIL mbox..." gnus-summary-save-article-rmail t]
2438               ["Save body in file..." gnus-summary-save-article-body-file t]
2439               ["Pipe through a filter..." gnus-summary-pipe-output t]
2440               ["Add to SOUP packet" gnus-soup-add-article t]
2441               ["Print with Muttprint..." gnus-summary-muttprint t]
2442               ["Print" gnus-summary-print-article
2443                ,@(if (featurep 'xemacs) '(t)
2444                    '(:help "Generate and print a PostScript image"))])
2445              ("Copy, move,... (Backend)"
2446               ,@(if (featurep 'xemacs) nil
2447                   '(:help "Copying, moving, expiring articles..."))
2448               ["Respool article..." gnus-summary-respool-article t]
2449               ["Move article..." gnus-summary-move-article
2450                (gnus-check-backend-function
2451                 'request-move-article gnus-newsgroup-name)]
2452               ["Copy article..." gnus-summary-copy-article t]
2453               ["Crosspost article..." gnus-summary-crosspost-article
2454                (gnus-check-backend-function
2455                 'request-replace-article gnus-newsgroup-name)]
2456               ["Import file..." gnus-summary-import-article
2457                (gnus-check-backend-function
2458                 'request-accept-article gnus-newsgroup-name)]
2459               ["Create article..." gnus-summary-create-article
2460                (gnus-check-backend-function
2461                 'request-accept-article gnus-newsgroup-name)]
2462               ["Check if posted" gnus-summary-article-posted-p t]
2463               ["Edit article" gnus-summary-edit-article
2464                (not (gnus-group-read-only-p))]
2465               ["Delete article" gnus-summary-delete-article
2466                (gnus-check-backend-function
2467                 'request-expire-articles gnus-newsgroup-name)]
2468               ["Query respool" gnus-summary-respool-query t]
2469               ["Trace respool" gnus-summary-respool-trace t]
2470               ["Delete expirable articles" gnus-summary-expire-articles-now
2471                (gnus-check-backend-function
2472                 'request-expire-articles gnus-newsgroup-name)])
2473              ("Extract"
2474               ["Uudecode" gnus-uu-decode-uu
2475                ,@(if (featurep 'xemacs) '(t)
2476                    '(:help "Decode uuencoded article(s)"))]
2477               ["Uudecode and save" gnus-uu-decode-uu-and-save t]
2478               ["Unshar" gnus-uu-decode-unshar t]
2479               ["Unshar and save" gnus-uu-decode-unshar-and-save t]
2480               ["Save" gnus-uu-decode-save t]
2481               ["Binhex" gnus-uu-decode-binhex t]
2482               ["Postscript" gnus-uu-decode-postscript t]
2483               ["All MIME parts" gnus-summary-save-parts t])
2484              ("Cache"
2485               ["Enter article" gnus-cache-enter-article t]
2486               ["Remove article" gnus-cache-remove-article t])
2487              ["Translate" gnus-article-babel t]
2488              ["Select article buffer" gnus-summary-select-article-buffer t]
2489              ["Make article buffer sticky" gnus-sticky-article t]
2490              ["Enter digest buffer" gnus-summary-enter-digest-group t]
2491              ["Isearch article..." gnus-summary-isearch-article t]
2492              ["Beginning of the article" gnus-summary-beginning-of-article t]
2493              ["End of the article" gnus-summary-end-of-article t]
2494              ["Fetch parent of article" gnus-summary-refer-parent-article t]
2495              ["Fetch referenced articles" gnus-summary-refer-references t]
2496              ["Fetch current thread" gnus-summary-refer-thread t]
2497              ["Fetch article with id..." gnus-summary-refer-article t]
2498              ["Setup Mailing List Params" gnus-mailing-list-insinuate t]
2499              ["Redisplay" gnus-summary-show-article t]
2500              ["Raw article" gnus-summary-show-raw-article :keys "C-u g"])))
2501       (easy-menu-define
2502         gnus-summary-article-menu gnus-summary-mode-map ""
2503         (cons "Article" innards))
2504
2505       (if (not (keymapp gnus-summary-article-menu))
2506           (easy-menu-define
2507             gnus-article-commands-menu gnus-article-mode-map ""
2508             (cons "Commands" innards))
2509         ;; in Emacs, don't share menu.
2510         (setq gnus-article-commands-menu
2511               (copy-keymap gnus-summary-article-menu))
2512         (define-key gnus-article-mode-map [menu-bar commands]
2513           (cons "Commands" gnus-article-commands-menu))))
2514
2515     (easy-menu-define
2516       gnus-summary-thread-menu gnus-summary-mode-map ""
2517       '("Threads"
2518         ["Find all messages in thread" gnus-summary-refer-thread t]
2519         ["Toggle threading" gnus-summary-toggle-threads t]
2520         ["Hide threads" gnus-summary-hide-all-threads t]
2521         ["Show threads" gnus-summary-show-all-threads t]
2522         ["Hide thread" gnus-summary-hide-thread t]
2523         ["Show thread" gnus-summary-show-thread t]
2524         ["Go to next thread" gnus-summary-next-thread t]
2525         ["Go to previous thread" gnus-summary-prev-thread t]
2526         ["Go down thread" gnus-summary-down-thread t]
2527         ["Go up thread" gnus-summary-up-thread t]
2528         ["Top of thread" gnus-summary-top-thread t]
2529         ["Mark thread as read" gnus-summary-kill-thread t]
2530         ["Mark thread as expired" gnus-summary-expire-thread t]
2531         ["Lower thread score" gnus-summary-lower-thread t]
2532         ["Raise thread score" gnus-summary-raise-thread t]
2533         ["Rethread current" gnus-summary-rethread-current t]))
2534
2535     (easy-menu-define
2536       gnus-summary-post-menu gnus-summary-mode-map ""
2537       `("Post"
2538         ["Send a message (mail or news)" gnus-summary-post-news
2539          ,@(if (featurep 'xemacs) '(t)
2540              '(:help "Compose a new message (mail or news)"))]
2541         ["Followup" gnus-summary-followup
2542          ,@(if (featurep 'xemacs) '(t)
2543              '(:help "Post followup to this article"))]
2544         ["Followup and yank" gnus-summary-followup-with-original
2545          ,@(if (featurep 'xemacs) '(t)
2546              '(:help "Post followup to this article, quoting its contents"))]
2547         ["Supersede article" gnus-summary-supersede-article t]
2548         ["Cancel article" gnus-summary-cancel-article
2549          ,@(if (featurep 'xemacs) '(t)
2550              '(:help "Cancel an article you posted"))]
2551         ["Reply" gnus-summary-reply t]
2552         ["Reply and yank" gnus-summary-reply-with-original t]
2553         ["Wide reply" gnus-summary-wide-reply t]
2554         ["Wide reply and yank" gnus-summary-wide-reply-with-original
2555          ,@(if (featurep 'xemacs) '(t)
2556              '(:help "Mail a reply, quoting this article"))]
2557         ["Very wide reply" gnus-summary-very-wide-reply t]
2558         ["Very wide reply and yank" gnus-summary-very-wide-reply-with-original
2559          ,@(if (featurep 'xemacs) '(t)
2560              '(:help "Mail a very wide reply, quoting this article"))]
2561         ["Mail forward" gnus-summary-mail-forward t]
2562         ["Post forward" gnus-summary-post-forward t]
2563         ["Digest and mail" gnus-uu-digest-mail-forward t]
2564         ["Digest and post" gnus-uu-digest-post-forward t]
2565         ["Resend message" gnus-summary-resend-message t]
2566         ["Resend message edit" gnus-summary-resend-message-edit t]
2567         ["Send bounced mail" gnus-summary-resend-bounced-mail t]
2568         ["Send a mail" gnus-summary-mail-other-window t]
2569         ["Create a local message" gnus-summary-news-other-window t]
2570         ["Uuencode and post" gnus-uu-post-news
2571          ,@(if (featurep 'xemacs) '(t)
2572              '(:help "Post a uuencoded article"))]
2573         ["Followup via news" gnus-summary-followup-to-mail t]
2574         ["Followup via news and yank"
2575          gnus-summary-followup-to-mail-with-original t]
2576         ["Strip signature on reply"
2577          (lambda ()
2578            (interactive)
2579            (if (not (memq message-cite-function
2580                           '(message-cite-original-without-signature
2581                             message-cite-original)))
2582                ;; Stupid workaround for XEmacs not honoring :visible.
2583                (message "Can't toggle this value of `message-cite-function'")
2584              (setq message-cite-function
2585                    (if (eq message-cite-function
2586                            'message-cite-original-without-signature)
2587                        'message-cite-original
2588                      'message-cite-original-without-signature))))
2589          ;; XEmacs barfs on :visible.
2590          ,@(if (featurep 'xemacs) nil
2591              '(:visible (memq message-cite-function
2592                               '(message-cite-original-without-signature
2593                                 message-cite-original))))
2594          :style toggle
2595          :selected (eq message-cite-function
2596                        'message-cite-original-without-signature)
2597          ,@(if (featurep 'xemacs) nil
2598              '(:help "Strip signature from cited article when replying."))]
2599         ;;("Draft"
2600         ;;["Send" gnus-summary-send-draft t]
2601         ;;["Send bounced" gnus-resend-bounced-mail t])
2602         ))
2603
2604     (cond
2605      ((not (keymapp gnus-summary-post-menu))
2606       (setq gnus-article-post-menu gnus-summary-post-menu))
2607      ((not gnus-article-post-menu)
2608       ;; Don't share post menu.
2609       (setq gnus-article-post-menu
2610             (copy-keymap gnus-summary-post-menu))))
2611     (define-key gnus-article-mode-map [menu-bar post]
2612       (cons "Post" gnus-article-post-menu))
2613
2614     (easy-menu-define
2615       gnus-summary-misc-menu gnus-summary-mode-map ""
2616       `("Gnus"
2617         ("Mark Read"
2618          ["Mark as read" gnus-summary-mark-as-read-forward t]
2619          ["Mark same subject and select"
2620           gnus-summary-kill-same-subject-and-select t]
2621          ["Mark same subject" gnus-summary-kill-same-subject t]
2622          ["Catchup" gnus-summary-catchup
2623           ,@(if (featurep 'xemacs) '(t)
2624               '(:help "Mark unread articles in this group as read"))]
2625          ["Catchup all" gnus-summary-catchup-all t]
2626          ["Catchup to here" gnus-summary-catchup-to-here t]
2627          ["Catchup from here" gnus-summary-catchup-from-here t]
2628          ["Catchup region" gnus-summary-mark-region-as-read
2629           (gnus-mark-active-p)]
2630          ["Mark excluded" gnus-summary-limit-mark-excluded-as-read t])
2631         ("Mark Various"
2632          ["Tick" gnus-summary-tick-article-forward t]
2633          ["Mark as dormant" gnus-summary-mark-as-dormant t]
2634          ["Remove marks" gnus-summary-clear-mark-forward t]
2635          ["Set expirable mark" gnus-summary-mark-as-expirable t]
2636          ["Set bookmark" gnus-summary-set-bookmark t]
2637          ["Remove bookmark" gnus-summary-remove-bookmark t])
2638         ("Registry Mark"
2639          ["Important"     gnus-registry-set-article-Important-mark    t]
2640          ["Not Important" gnus-registry-remove-article-Important-mark t]
2641          ["Work"          gnus-registry-set-article-Work-mark         t]
2642          ["Not Work"      gnus-registry-remove-article-Work-mark      t]
2643          ["Later"         gnus-registry-set-article-Later-mark        t]
2644          ["Not Later"     gnus-registry-remove-article-Later-mark     t]
2645          ["Personal"      gnus-registry-set-article-Personal-mark     t]
2646          ["Not Personal"  gnus-registry-remove-article-Personal-mark  t]
2647          ["To Do"         gnus-registry-set-article-To-Do-mark        t]
2648          ["Not To Do"     gnus-registry-remove-article-To-Do-mark     t])
2649         ("Limit to"
2650          ["Marks..." gnus-summary-limit-to-marks t]
2651          ["Subject..." gnus-summary-limit-to-subject t]
2652          ["Author..." gnus-summary-limit-to-author t]
2653          ["Recipient..." gnus-summary-limit-to-recipient t]
2654          ["Address..." gnus-summary-limit-to-address t]
2655          ["Age..." gnus-summary-limit-to-age t]
2656          ["Extra..." gnus-summary-limit-to-extra t]
2657          ["Score..." gnus-summary-limit-to-score t]
2658          ["Display Predicate" gnus-summary-limit-to-display-predicate t]
2659          ["Unread" gnus-summary-limit-to-unread t]
2660          ["Unseen" gnus-summary-limit-to-unseen t]
2661          ["Singletons" gnus-summary-limit-to-singletons t]
2662          ["Replied" gnus-summary-limit-to-replied t]
2663          ["Non-dormant" gnus-summary-limit-exclude-dormant t]
2664          ["Next or process marked articles" gnus-summary-limit-to-articles t]
2665          ["Pop limit" gnus-summary-pop-limit t]
2666          ["Show dormant" gnus-summary-limit-include-dormant t]
2667          ["Hide childless dormant"
2668           gnus-summary-limit-exclude-childless-dormant t]
2669          ;;["Hide thread" gnus-summary-limit-exclude-thread t]
2670          ["Hide marked" gnus-summary-limit-exclude-marks t]
2671          ["Show expunged" gnus-summary-limit-include-expunged t])
2672         ("Process Mark"
2673          ["Set mark" gnus-summary-mark-as-processable t]
2674          ["Remove mark" gnus-summary-unmark-as-processable t]
2675          ["Remove all marks" gnus-summary-unmark-all-processable t]
2676          ["Invert marks" gnus-uu-invert-processable t]
2677          ["Mark above" gnus-uu-mark-over t]
2678          ["Mark series" gnus-uu-mark-series t]
2679          ["Mark region" gnus-uu-mark-region (gnus-mark-active-p)]
2680          ["Unmark region" gnus-uu-unmark-region (gnus-mark-active-p)]
2681          ["Mark by regexp..." gnus-uu-mark-by-regexp t]
2682          ["Unmark by regexp..." gnus-uu-unmark-by-regexp t]
2683          ["Mark all" gnus-uu-mark-all t]
2684          ["Mark buffer" gnus-uu-mark-buffer t]
2685          ["Mark sparse" gnus-uu-mark-sparse t]
2686          ["Mark thread" gnus-uu-mark-thread t]
2687          ["Unmark thread" gnus-uu-unmark-thread t]
2688          ("Process Mark Sets"
2689           ["Kill" gnus-summary-kill-process-mark t]
2690           ["Yank" gnus-summary-yank-process-mark
2691            gnus-newsgroup-process-stack]
2692           ["Save" gnus-summary-save-process-mark t]
2693           ["Run command on marked..." gnus-summary-universal-argument t]))
2694         ("Scroll article"
2695          ["Page forward" gnus-summary-next-page
2696           ,@(if (featurep 'xemacs) '(t)
2697               '(:help "Show next page of article"))]
2698          ["Page backward" gnus-summary-prev-page
2699           ,@(if (featurep 'xemacs) '(t)
2700               '(:help "Show previous page of article"))]
2701          ["Line forward" gnus-summary-scroll-up t])
2702         ("Move"
2703          ["Next unread article" gnus-summary-next-unread-article t]
2704          ["Previous unread article" gnus-summary-prev-unread-article t]
2705          ["Next article" gnus-summary-next-article t]
2706          ["Previous article" gnus-summary-prev-article t]
2707          ["Next unread subject" gnus-summary-next-unread-subject t]
2708          ["Previous unread subject" gnus-summary-prev-unread-subject t]
2709          ["Next article same subject" gnus-summary-next-same-subject t]
2710          ["Previous article same subject" gnus-summary-prev-same-subject t]
2711          ["First unread article" gnus-summary-first-unread-article t]
2712          ["Best unread article" gnus-summary-best-unread-article t]
2713          ["Go to subject number..." gnus-summary-goto-subject t]
2714          ["Go to article number..." gnus-summary-goto-article t]
2715          ["Go to the last article" gnus-summary-goto-last-article t]
2716          ["Pop article off history" gnus-summary-pop-article t])
2717         ("Sort"
2718          ["Sort by number" gnus-summary-sort-by-number t]
2719          ["Sort by most recent number" gnus-summary-sort-by-most-recent-number t]
2720          ["Sort by author" gnus-summary-sort-by-author t]
2721          ["Sort by recipient" gnus-summary-sort-by-recipient t]
2722          ["Sort by subject" gnus-summary-sort-by-subject t]
2723          ["Sort by date" gnus-summary-sort-by-date t]
2724          ["Sort by most recent date" gnus-summary-sort-by-most-recent-date t]
2725          ["Sort by score" gnus-summary-sort-by-score t]
2726          ["Sort by lines" gnus-summary-sort-by-lines t]
2727          ["Sort by characters" gnus-summary-sort-by-chars t]
2728          ["Randomize" gnus-summary-sort-by-random t]
2729          ["Original sort" gnus-summary-sort-by-original t])
2730         ("Help"
2731          ["Fetch group FAQ" gnus-summary-fetch-faq t]
2732          ["Describe group" gnus-summary-describe-group t]
2733          ["Fetch charter" gnus-group-fetch-charter
2734           ,@(if (featurep 'xemacs) nil
2735               '(:help "Display the charter of the current group"))]
2736          ["Fetch control message" gnus-group-fetch-control
2737           ,@(if (featurep 'xemacs) nil
2738               '(:help "Display the archived control message for the current group"))]
2739          ["Read manual" gnus-info-find-node t])
2740         ("Modes"
2741          ["Pick and read" gnus-pick-mode t]
2742          ["Binary" gnus-binary-mode t])
2743         ("Regeneration"
2744          ["Regenerate" gnus-summary-prepare t]
2745          ["Insert cached articles" gnus-summary-insert-cached-articles t]
2746          ["Insert dormant articles" gnus-summary-insert-dormant-articles t]
2747          ["Insert ticked articles" gnus-summary-insert-ticked-articles t]
2748          ["Toggle threading" gnus-summary-toggle-threads t])
2749         ["See old articles" gnus-summary-insert-old-articles t]
2750         ["See new articles" gnus-summary-insert-new-articles t]
2751         ["Filter articles..." gnus-summary-execute-command t]
2752         ["Run command on articles..." gnus-summary-universal-argument t]
2753         ["Search articles forward..." gnus-summary-search-article-forward t]
2754         ["Search articles backward..." gnus-summary-search-article-backward t]
2755         ["Toggle line truncation" gnus-summary-toggle-truncation t]
2756         ["Expand window" gnus-summary-expand-window t]
2757         ["Expire expirable articles" gnus-summary-expire-articles
2758          (gnus-check-backend-function
2759           'request-expire-articles gnus-newsgroup-name)]
2760         ["Edit local kill file" gnus-summary-edit-local-kill t]
2761         ["Edit main kill file" gnus-summary-edit-global-kill t]
2762         ["Edit group parameters" gnus-summary-edit-parameters t]
2763         ["Customize group parameters" gnus-summary-customize-parameters t]
2764         ["Send a bug report" gnus-bug t]
2765         ("Exit"
2766          ["Catchup and exit" gnus-summary-catchup-and-exit
2767           ,@(if (featurep 'xemacs) '(t)
2768               '(:help "Mark unread articles in this group as read, then exit"))]
2769          ["Catchup all and exit" gnus-summary-catchup-all-and-exit t]
2770          ["Catchup and goto next" gnus-summary-catchup-and-goto-next-group t]
2771          ["Catchup and goto prev" gnus-summary-catchup-and-goto-prev-group t]
2772          ["Exit group" gnus-summary-exit
2773           ,@(if (featurep 'xemacs) '(t)
2774               '(:help "Exit current group, return to group selection mode"))]
2775          ["Exit group without updating" gnus-summary-exit-no-update t]
2776          ["Exit and goto next group" gnus-summary-next-group t]
2777          ["Exit and goto prev group" gnus-summary-prev-group t]
2778          ["Reselect group" gnus-summary-reselect-current-group t]
2779          ["Rescan group" gnus-summary-rescan-group t]
2780          ["Update dribble" gnus-summary-save-newsrc t])))
2781
2782     (gnus-run-hooks 'gnus-summary-menu-hook)))
2783
2784 (defvar gnus-summary-tool-bar-map nil)
2785
2786 ;; Note: The :set function in the `gnus-summary-tool-bar*' variables will only
2787 ;; affect _new_ message buffers.  We might add a function that walks thru all
2788 ;; summary-mode buffers and force the update.
2789 (defun gnus-summary-tool-bar-update (&optional symbol value)
2790   "Update summary mode toolbar.
2791 Setter function for custom variables."
2792   (setq-default gnus-summary-tool-bar-map nil)
2793   (when symbol
2794     ;; When used as ":set" function:
2795     (set-default symbol value))
2796   (when (gnus-buffer-live-p gnus-summary-buffer)
2797     (with-current-buffer gnus-summary-buffer
2798       (gnus-summary-make-tool-bar))))
2799
2800 (defcustom gnus-summary-tool-bar (if (eq gmm-tool-bar-style 'gnome)
2801                                      'gnus-summary-tool-bar-gnome
2802                                    'gnus-summary-tool-bar-retro)
2803   "Specifies the Gnus summary tool bar.
2804
2805 It can be either a list or a symbol refering to a list.  See
2806 `gmm-tool-bar-from-list' for the format of the list.  The
2807 default key map is `gnus-summary-mode-map'.
2808
2809 Pre-defined symbols include `gnus-summary-tool-bar-gnome' and
2810 `gnus-summary-tool-bar-retro'."
2811   :type '(choice (const :tag "GNOME style" gnus-summary-tool-bar-gnome)
2812                  (const :tag "Retro look"  gnus-summary-tool-bar-retro)
2813                  (repeat :tag "User defined list" gmm-tool-bar-item)
2814                  (symbol))
2815   :version "23.1" ;; No Gnus
2816   :initialize 'custom-initialize-default
2817   :set 'gnus-summary-tool-bar-update
2818   :group 'gnus-summary)
2819
2820 (defcustom gnus-summary-tool-bar-gnome
2821   '((gnus-summary-post-news "mail/compose" nil)
2822     (gnus-summary-insert-new-articles "mail/inbox" nil
2823                                       :visible (or (not gnus-agent)
2824                                                    gnus-plugged))
2825     (gnus-summary-reply-with-original "mail/reply")
2826     (gnus-summary-reply "mail/reply" nil :visible nil)
2827     (gnus-summary-followup-with-original "mail/reply-all")
2828     (gnus-summary-followup "mail/reply-all" nil :visible nil)
2829     (gnus-summary-mail-forward "mail/forward")
2830     (gnus-summary-save-article "mail/save")
2831     (gnus-summary-search-article-forward "search" nil :visible nil)
2832     (gnus-summary-print-article "print")
2833     (gnus-summary-tick-article-forward "flag-followup" nil :visible nil)
2834     ;; Some new commands that may need more suitable icons:
2835     (gnus-summary-save-newsrc "save" nil :visible nil)
2836     ;; (gnus-summary-show-article "stock_message-display" nil :visible nil)
2837     (gnus-summary-prev-article "left-arrow")
2838     (gnus-summary-next-article "right-arrow")
2839     (gnus-summary-next-page "next-page")
2840     ;; (gnus-summary-enter-digest-group "right_arrow" nil :visible nil)
2841     ;;
2842     ;; Maybe some sort-by-... could be added:
2843     ;; (gnus-summary-sort-by-author "sort-a-z" nil :visible nil)
2844     ;; (gnus-summary-sort-by-date "sort-1-9" nil :visible nil)
2845     (gnus-summary-mark-as-expirable
2846      "delete" nil
2847      :visible (gnus-check-backend-function 'request-expire-articles
2848                                            gnus-newsgroup-name))
2849     (gnus-summary-mark-as-spam
2850      "mail/spam" t
2851      :visible (and (fboundp 'spam-group-ham-contents-p)
2852                    (spam-group-ham-contents-p gnus-newsgroup-name))
2853      :help "Mark as spam")
2854     (gnus-summary-mark-as-read-forward
2855      "mail/not-spam" nil
2856      :visible (and (fboundp 'spam-group-spam-contents-p)
2857                    (spam-group-spam-contents-p gnus-newsgroup-name)))
2858     ;;
2859     (gnus-summary-exit "exit")
2860     (gmm-customize-mode "preferences" t :help "Edit mode preferences")
2861     (gnus-info-find-node "help"))
2862   "List of functions for the summary tool bar (GNOME style).
2863
2864 See `gmm-tool-bar-from-list' for the format of the list."
2865   :type '(repeat gmm-tool-bar-item)
2866   :version "23.1" ;; No Gnus
2867   :initialize 'custom-initialize-default
2868   :set 'gnus-summary-tool-bar-update
2869   :group 'gnus-summary)
2870
2871 (defcustom gnus-summary-tool-bar-retro
2872   '((gnus-summary-prev-unread-article "gnus/prev-ur")
2873     (gnus-summary-next-unread-article "gnus/next-ur")
2874     (gnus-summary-post-news "gnus/post")
2875     (gnus-summary-followup-with-original "gnus/fuwo")
2876     (gnus-summary-followup "gnus/followup")
2877     (gnus-summary-reply-with-original "gnus/reply-wo")
2878     (gnus-summary-reply "gnus/reply")
2879     (gnus-summary-caesar-message "gnus/rot13")
2880     (gnus-uu-decode-uu "gnus/uu-decode")
2881     (gnus-summary-save-article-file "gnus/save-aif")
2882     (gnus-summary-save-article "gnus/save-art")
2883     (gnus-uu-post-news "gnus/uu-post")
2884     (gnus-summary-catchup "gnus/catchup")
2885     (gnus-summary-catchup-and-exit "gnus/cu-exit")
2886     (gnus-summary-exit "gnus/exit-summ")
2887     ;; Some new command that may need more suitable icons:
2888     (gnus-summary-print-article "gnus/print" nil :visible nil)
2889     (gnus-summary-mark-as-expirable "gnus/close" nil :visible nil)
2890     (gnus-summary-save-newsrc "gnus/save" nil :visible nil)
2891     ;; (gnus-summary-enter-digest-group "gnus/right_arrow" nil :visible nil)
2892     (gnus-summary-search-article-forward "gnus/search" nil :visible nil)
2893     ;; (gnus-summary-insert-new-articles "gnus/paste" nil :visible nil)
2894     ;; (gnus-summary-toggle-threads "gnus/open" nil :visible nil)
2895     ;;
2896     (gnus-info-find-node "gnus/help" nil :visible nil))
2897   "List of functions for the summary tool bar (retro look).
2898
2899 See `gmm-tool-bar-from-list' for the format of the list."
2900   :type '(repeat gmm-tool-bar-item)
2901   :version "23.1" ;; No Gnus
2902   :initialize 'custom-initialize-default
2903   :set 'gnus-summary-tool-bar-update
2904   :group 'gnus-summary)
2905
2906 (defcustom gnus-summary-tool-bar-zap-list t
2907   "List of icon items from the global tool bar.
2908 These items are not displayed in the Gnus summary mode tool bar.
2909
2910 See `gmm-tool-bar-from-list' for the format of the list."
2911   :type 'gmm-tool-bar-zap-list
2912   :version "23.1" ;; No Gnus
2913   :initialize 'custom-initialize-default
2914   :set 'gnus-summary-tool-bar-update
2915   :group 'gnus-summary)
2916
2917 (defvar image-load-path)
2918 (defvar tool-bar-map)
2919
2920 (defun gnus-summary-make-tool-bar (&optional force)
2921   "Make a summary mode tool bar from `gnus-summary-tool-bar'.
2922 When FORCE, rebuild the tool bar."
2923   (when (and (not (featurep 'xemacs))
2924              (boundp 'tool-bar-mode)
2925              tool-bar-mode
2926              (or (not gnus-summary-tool-bar-map) force))
2927     (let* ((load-path
2928             (gmm-image-load-path-for-library "gnus"
2929                                              "mail/save.xpm"
2930                                              nil t))
2931            (image-load-path (cons (car load-path)
2932                                   (when (boundp 'image-load-path)
2933                                     image-load-path)))
2934            (map (gmm-tool-bar-from-list gnus-summary-tool-bar
2935                                         gnus-summary-tool-bar-zap-list
2936                                         'gnus-summary-mode-map)))
2937       (when map
2938         ;; Need to set `gnus-summary-tool-bar-map' because `gnus-article-mode'
2939         ;; uses it's value.
2940         (setq gnus-summary-tool-bar-map map))))
2941   (set (make-local-variable 'tool-bar-map) gnus-summary-tool-bar-map))
2942
2943 (defun gnus-score-set-default (var value)
2944   "A version of set that updates the GNU Emacs menu-bar."
2945   (set var value)
2946   ;; It is the message that forces the active status to be updated.
2947   (message ""))
2948
2949 (defun gnus-make-score-map (type)
2950   "Make a summary score map of type TYPE."
2951   (if t
2952       nil
2953     (let ((headers '(("author" "from" string)
2954                      ("subject" "subject" string)
2955                      ("article body" "body" string)
2956                      ("article head" "head" string)
2957                      ("xref" "xref" string)
2958                      ("extra header" "extra" string)
2959                      ("lines" "lines" number)
2960                      ("followups to author" "followup" string)))
2961           (types '((number ("less than" <)
2962                            ("greater than" >)
2963                            ("equal" =))
2964                    (string ("substring" s)
2965                            ("exact string" e)
2966                            ("fuzzy string" f)
2967                            ("regexp" r))))
2968           (perms '(("temporary" (current-time-string))
2969                    ("permanent" nil)
2970                    ("immediate" now)))
2971           header)
2972       (list
2973        (apply
2974         'nconc
2975         (list
2976          (if (eq type 'lower)
2977              "Lower score"
2978            "Increase score"))
2979         (let (outh)
2980           (while headers
2981             (setq header (car headers))
2982             (setq outh
2983                   (cons
2984                    (apply
2985                     'nconc
2986                     (list (car header))
2987                     (let ((ts (cdr (assoc (nth 2 header) types)))
2988                           outt)
2989                       (while ts
2990                         (setq outt
2991                               (cons
2992                                (apply
2993                                 'nconc
2994                                 (list (caar ts))
2995                                 (let ((ps perms)
2996                                       outp)
2997                                   (while ps
2998                                     (setq outp
2999                                           (cons
3000                                            (vector
3001                                             (caar ps)
3002                                             (list
3003                                              'gnus-summary-score-entry
3004                                              (nth 1 header)
3005                                              (if (or (string= (nth 1 header)
3006                                                               "head")
3007                                                      (string= (nth 1 header)
3008                                                               "body"))
3009                                                  ""
3010                                                (list 'gnus-summary-header
3011                                                      (nth 1 header)))
3012                                              (list 'quote (nth 1 (car ts)))
3013                                              (list 'gnus-score-delta-default
3014                                                    nil)
3015                                              (nth 1 (car ps))
3016                                              t)
3017                                             t)
3018                                            outp))
3019                                     (setq ps (cdr ps)))
3020                                   (list (nreverse outp))))
3021                                outt))
3022                         (setq ts (cdr ts)))
3023                       (list (nreverse outt))))
3024                    outh))
3025             (setq headers (cdr headers)))
3026           (list (nreverse outh))))))))
3027
3028
3029 (declare-function turn-on-gnus-mailing-list-mode "gnus-ml" ())
3030
3031 \f
3032
3033 (defun gnus-summary-mode (&optional group)
3034   "Major mode for reading articles.
3035
3036 All normal editing commands are switched off.
3037 \\<gnus-summary-mode-map>
3038 Each line in this buffer represents one article.  To read an
3039 article, you can, for instance, type `\\[gnus-summary-next-page]'.  To move forwards
3040 and backwards while displaying articles, type `\\[gnus-summary-next-unread-article]' and `\\[gnus-summary-prev-unread-article]',
3041 respectively.
3042
3043 You can also post articles and send mail from this buffer.  To
3044 follow up an article, type `\\[gnus-summary-followup]'.  To mail a reply to the author
3045 of an article, type `\\[gnus-summary-reply]'.
3046
3047 There are approx. one gazillion commands you can execute in this
3048 buffer; read the info pages for more information (`\\[gnus-info-find-node]').
3049
3050 The following commands are available:
3051
3052 \\{gnus-summary-mode-map}"
3053   (interactive)
3054   (kill-all-local-variables)
3055   (let ((gnus-summary-local-variables gnus-newsgroup-variables))
3056     (gnus-summary-make-local-variables))
3057   (gnus-summary-make-local-variables)
3058   (setq gnus-newsgroup-name group)
3059   (when (gnus-visual-p 'summary-menu 'menu)
3060     (gnus-summary-make-menu-bar)
3061     (gnus-summary-make-tool-bar))
3062   (gnus-make-thread-indent-array)
3063   (gnus-simplify-mode-line)
3064   (setq major-mode 'gnus-summary-mode)
3065   (setq mode-name "Summary")
3066   (make-local-variable 'minor-mode-alist)
3067   (use-local-map gnus-summary-mode-map)
3068   (buffer-disable-undo)
3069   (setq buffer-read-only t              ;Disable modification
3070         show-trailing-whitespace nil)
3071   (setq truncate-lines t)
3072   (add-to-invisibility-spec '(gnus-sum . t))
3073   (gnus-summary-set-display-table)
3074   (gnus-set-default-directory)
3075   (make-local-variable 'gnus-summary-line-format)
3076   (make-local-variable 'gnus-summary-line-format-spec)
3077   (make-local-variable 'gnus-summary-dummy-line-format)
3078   (make-local-variable 'gnus-summary-dummy-line-format-spec)
3079   (make-local-variable 'gnus-summary-mark-positions)
3080   (gnus-make-local-hook 'pre-command-hook)
3081   (add-hook 'pre-command-hook 'gnus-set-global-variables nil t)
3082   (gnus-run-mode-hooks 'gnus-summary-mode-hook)
3083   (turn-on-gnus-mailing-list-mode)
3084   (mm-enable-multibyte)
3085   (gnus-update-format-specifications nil 'summary 'summary-mode 'summary-dummy)
3086   (gnus-update-summary-mark-positions))
3087
3088 (defun gnus-summary-make-local-variables ()
3089   "Make all the local summary buffer variables."
3090   (let (global)
3091     (dolist (local gnus-summary-local-variables)
3092       (if (consp local)
3093           (progn
3094             (if (eq (cdr local) 'global)
3095                 ;; Copy the global value of the variable.
3096                 (setq global (symbol-value (car local)))
3097               ;; Use the value from the list.
3098               (setq global (eval (cdr local))))
3099             (set (make-local-variable (car local)) global))
3100         ;; Simple nil-valued local variable.
3101         (set (make-local-variable local) nil)))))
3102
3103 (defun gnus-summary-clear-local-variables ()
3104   (let ((locals gnus-summary-local-variables))
3105     (while locals
3106       (if (consp (car locals))
3107           (and (symbolp (caar locals))
3108                (set (caar locals) nil))
3109         (and (symbolp (car locals))
3110              (set (car locals) nil)))
3111       (setq locals (cdr locals)))))
3112
3113 ;; Summary data functions.
3114
3115 (defmacro gnus-data-number (data)
3116   `(car ,data))
3117
3118 (defmacro gnus-data-set-number (data number)
3119   `(setcar ,data ,number))
3120
3121 (defmacro gnus-data-mark (data)
3122   `(nth 1 ,data))
3123
3124 (defmacro gnus-data-set-mark (data mark)
3125   `(setcar (nthcdr 1 ,data) ,mark))
3126
3127 (defmacro gnus-data-pos (data)
3128   `(nth 2 ,data))
3129
3130 (defmacro gnus-data-set-pos (data pos)
3131   `(setcar (nthcdr 2 ,data) ,pos))
3132
3133 (defmacro gnus-data-header (data)
3134   `(nth 3 ,data))
3135
3136 (defmacro gnus-data-set-header (data header)
3137   `(setf (nth 3 ,data) ,header))
3138
3139 (defmacro gnus-data-level (data)
3140   `(nth 4 ,data))
3141
3142 (defmacro gnus-data-unread-p (data)
3143   `(= (nth 1 ,data) gnus-unread-mark))
3144
3145 (defmacro gnus-data-read-p (data)
3146   `(/= (nth 1 ,data) gnus-unread-mark))
3147
3148 (defmacro gnus-data-pseudo-p (data)
3149   `(consp (nth 3 ,data)))
3150
3151 (defmacro gnus-data-find (number)
3152   `(assq ,number gnus-newsgroup-data))
3153
3154 (defmacro gnus-data-find-list (number &optional data)
3155   `(let ((bdata ,(or data 'gnus-newsgroup-data)))
3156      (memq (assq ,number bdata)
3157            bdata)))
3158
3159 (defmacro gnus-data-make (number mark pos header level)
3160   `(list ,number ,mark ,pos ,header ,level))
3161
3162 (defun gnus-data-enter (after-article number mark pos header level offset)
3163   (let ((data (gnus-data-find-list after-article)))
3164     (unless data
3165       (error "No such article: %d" after-article))
3166     (setcdr data (cons (gnus-data-make number mark pos header level)
3167                        (cdr data)))
3168     (setq gnus-newsgroup-data-reverse nil)
3169     (gnus-data-update-list (cddr data) offset)))
3170
3171 (defun gnus-data-enter-list (after-article list &optional offset)
3172   (when list
3173     (let ((data (and after-article (gnus-data-find-list after-article)))
3174           (ilist list))
3175       (if (not (or data
3176                    after-article))
3177           (let ((odata gnus-newsgroup-data))
3178             (setq gnus-newsgroup-data (nconc list gnus-newsgroup-data))
3179             (when offset
3180               (gnus-data-update-list odata offset)))
3181         ;; Find the last element in the list to be spliced into the main
3182         ;; list.
3183         (setq list (last list))
3184         (if (not data)
3185             (progn
3186               (setcdr list gnus-newsgroup-data)
3187               (setq gnus-newsgroup-data ilist)
3188               (when offset
3189                 (gnus-data-update-list (cdr list) offset)))
3190           (setcdr list (cdr data))
3191           (setcdr data ilist)
3192           (when offset
3193             (gnus-data-update-list (cdr list) offset))))
3194       (setq gnus-newsgroup-data-reverse nil))))
3195
3196 (defun gnus-data-remove (article &optional offset)
3197   (let ((data gnus-newsgroup-data))
3198     (if (= (gnus-data-number (car data)) article)
3199         (progn
3200           (setq gnus-newsgroup-data (cdr gnus-newsgroup-data)
3201                 gnus-newsgroup-data-reverse nil)
3202           (when offset
3203             (gnus-data-update-list gnus-newsgroup-data offset)))
3204       (while (cdr data)
3205         (when (= (gnus-data-number (cadr data)) article)
3206           (setcdr data (cddr data))
3207           (when offset
3208             (gnus-data-update-list (cdr data) offset))
3209           (setq data nil
3210                 gnus-newsgroup-data-reverse nil))
3211         (setq data (cdr data))))))
3212
3213 (defmacro gnus-data-list (backward)
3214   `(if ,backward
3215        (or gnus-newsgroup-data-reverse
3216            (setq gnus-newsgroup-data-reverse
3217                  (reverse gnus-newsgroup-data)))
3218      gnus-newsgroup-data))
3219
3220 (defun gnus-data-update-list (data offset)
3221   "Add OFFSET to the POS of all data entries in DATA."
3222   (setq gnus-newsgroup-data-reverse nil)
3223   (while data
3224     (setcar (nthcdr 2 (car data)) (+ offset (nth 2 (car data))))
3225     (setq data (cdr data))))
3226
3227 (defun gnus-summary-article-pseudo-p (article)
3228   "Say whether this article is a pseudo article or not."
3229   (not (vectorp (gnus-data-header (gnus-data-find article)))))
3230
3231 (defmacro gnus-summary-article-sparse-p (article)
3232   "Say whether this article is a sparse article or not."
3233   `(memq ,article gnus-newsgroup-sparse))
3234
3235 (defmacro gnus-summary-article-ancient-p (article)
3236   "Say whether this article is a sparse article or not."
3237   `(memq ,article gnus-newsgroup-ancient))
3238
3239 (defun gnus-article-parent-p (number)
3240   "Say whether this article is a parent or not."
3241   (let ((data (gnus-data-find-list number)))
3242     (and (cdr data)              ; There has to be an article after...
3243          (< (gnus-data-level (car data)) ; And it has to have a higher level.
3244             (gnus-data-level (nth 1 data))))))
3245
3246 (defun gnus-article-children (number)
3247   "Return a list of all children to NUMBER."
3248   (let* ((data (gnus-data-find-list number))
3249          (level (gnus-data-level (car data)))
3250          children)
3251     (setq data (cdr data))
3252     (while (and data
3253                 (= (gnus-data-level (car data)) (1+ level)))
3254       (push (gnus-data-number (car data)) children)
3255       (setq data (cdr data)))
3256     children))
3257
3258 (defmacro gnus-summary-skip-intangible ()
3259   "If the current article is intangible, then jump to a different article."
3260   '(let ((to (get-text-property (point) 'gnus-intangible)))
3261      (and to (gnus-summary-goto-subject to))))
3262
3263 (defmacro gnus-summary-article-intangible-p ()
3264   "Say whether this article is intangible or not."
3265   '(get-text-property (point) 'gnus-intangible))
3266
3267 (defun gnus-article-read-p (article)
3268   "Say whether ARTICLE is read or not."
3269   (not (or (memq article gnus-newsgroup-marked)
3270            (memq article gnus-newsgroup-spam-marked)
3271            (memq article gnus-newsgroup-unreads)
3272            (memq article gnus-newsgroup-unselected)
3273            (memq article gnus-newsgroup-dormant))))
3274
3275 ;; Some summary mode macros.
3276
3277 (defmacro gnus-summary-article-number ()
3278   "The article number of the article on the current line.
3279 If there isn't an article number here, then we return the current
3280 article number."
3281   '(progn
3282      (gnus-summary-skip-intangible)
3283      (or (get-text-property (point) 'gnus-number)
3284          (gnus-summary-last-subject))))
3285
3286 (defmacro gnus-summary-article-header (&optional number)
3287   "Return the header of article NUMBER."
3288   `(gnus-data-header (gnus-data-find
3289                       ,(or number '(gnus-summary-article-number)))))
3290
3291 (defmacro gnus-summary-thread-level (&optional number)
3292   "Return the level of thread that starts with article NUMBER."
3293   `(if (and (eq gnus-summary-make-false-root 'dummy)
3294             (get-text-property (point) 'gnus-intangible))
3295        0
3296      (gnus-data-level (gnus-data-find
3297                        ,(or number '(gnus-summary-article-number))))))
3298
3299 (defmacro gnus-summary-article-mark (&optional number)
3300   "Return the mark of article NUMBER."
3301   `(gnus-data-mark (gnus-data-find
3302                     ,(or number '(gnus-summary-article-number)))))
3303
3304 (defmacro gnus-summary-article-pos (&optional number)
3305   "Return the position of the line of article NUMBER."
3306   `(gnus-data-pos (gnus-data-find
3307                    ,(or number '(gnus-summary-article-number)))))
3308
3309 (defalias 'gnus-summary-subject-string 'gnus-summary-article-subject)
3310 (defmacro gnus-summary-article-subject (&optional number)
3311   "Return current subject string or nil if nothing."
3312   `(let ((headers
3313           ,(if number
3314                `(gnus-data-header (assq ,number gnus-newsgroup-data))
3315              '(gnus-data-header (assq (gnus-summary-article-number)
3316                                       gnus-newsgroup-data)))))
3317      (and headers
3318           (vectorp headers)
3319           (mail-header-subject headers))))
3320
3321 (defmacro gnus-summary-article-score (&optional number)
3322   "Return current article score."
3323   `(or (cdr (assq ,(or number '(gnus-summary-article-number))
3324                   gnus-newsgroup-scored))
3325        gnus-summary-default-score 0))
3326
3327 (defun gnus-summary-article-children (&optional number)
3328   "Return a list of article numbers that are children of article NUMBER."
3329   (let* ((data (gnus-data-find-list (or number (gnus-summary-article-number))))
3330          (level (gnus-data-level (car data)))
3331          l children)
3332     (while (and (setq data (cdr data))
3333                 (> (setq l (gnus-data-level (car data))) level))
3334       (and (= (1+ level) l)
3335            (push (gnus-data-number (car data))
3336                  children)))
3337     (nreverse children)))
3338
3339 (defun gnus-summary-article-parent (&optional number)
3340   "Return the article number of the parent of article NUMBER."
3341   (let* ((data (gnus-data-find-list (or number (gnus-summary-article-number))
3342                                     (gnus-data-list t)))
3343          (level (gnus-data-level (car data))))
3344     (if (zerop level)
3345         ()                              ; This is a root.
3346       ;; We search until we find an article with a level less than
3347       ;; this one.  That function has to be the parent.
3348       (while (and (setq data (cdr data))
3349                   (not (< (gnus-data-level (car data)) level))))
3350       (and data (gnus-data-number (car data))))))
3351
3352 (defun gnus-unread-mark-p (mark)
3353   "Say whether MARK is the unread mark."
3354   (= mark gnus-unread-mark))
3355
3356 (defun gnus-read-mark-p (mark)
3357   "Say whether MARK is one of the marks that mark as read.
3358 This is all marks except unread, ticked, dormant, and expirable."
3359   (not (or (= mark gnus-unread-mark)
3360            (= mark gnus-ticked-mark)
3361            (= mark gnus-spam-mark)
3362            (= mark gnus-dormant-mark)
3363            (= mark gnus-expirable-mark))))
3364
3365 (defmacro gnus-article-mark (number)
3366   "Return the MARK of article NUMBER.
3367 This macro should only be used when computing the mark the \"first\"
3368 time; i.e., when generating the summary lines.  After that,
3369 `gnus-summary-article-mark' should be used to examine the
3370 marks of articles."
3371   `(cond
3372     ((memq ,number gnus-newsgroup-unsendable) gnus-unsendable-mark)
3373     ((memq ,number gnus-newsgroup-downloadable) gnus-downloadable-mark)
3374     ((memq ,number gnus-newsgroup-unreads) gnus-unread-mark)
3375     ((memq ,number gnus-newsgroup-marked) gnus-ticked-mark)
3376     ((memq ,number gnus-newsgroup-spam-marked) gnus-spam-mark)
3377     ((memq ,number gnus-newsgroup-dormant) gnus-dormant-mark)
3378     ((memq ,number gnus-newsgroup-expirable) gnus-expirable-mark)
3379     (t (or (cdr (assq ,number gnus-newsgroup-reads))
3380            gnus-ancient-mark))))
3381
3382 ;; Saving hidden threads.
3383
3384 (defmacro gnus-save-hidden-threads (&rest forms)
3385   "Save hidden threads, eval FORMS, and restore the hidden threads."
3386   (let ((config (make-symbol "config")))
3387     `(let ((,config (gnus-hidden-threads-configuration)))
3388        (unwind-protect
3389            (save-excursion
3390              ,@forms)
3391          (gnus-restore-hidden-threads-configuration ,config)))))
3392 (put 'gnus-save-hidden-threads 'lisp-indent-function 0)
3393 (put 'gnus-save-hidden-threads 'edebug-form-spec '(body))
3394
3395 (defun gnus-data-compute-positions ()
3396   "Compute the positions of all articles."
3397   (setq gnus-newsgroup-data-reverse nil)
3398   (let ((data gnus-newsgroup-data))
3399     (save-excursion
3400       (gnus-save-hidden-threads
3401         (gnus-summary-show-all-threads)
3402         (goto-char (point-min))
3403         (while data
3404           (while (get-text-property (point) 'gnus-intangible)
3405             (forward-line 1))
3406           (gnus-data-set-pos (car data) (+ (point) 3))
3407           (setq data (cdr data))
3408           (forward-line 1))))))
3409
3410 (defun gnus-hidden-threads-configuration ()
3411   "Return the current hidden threads configuration."
3412   (save-excursion
3413     (let (config)
3414       (goto-char (point-min))
3415       (while (search-forward "\r" nil t)
3416         (push (1- (point)) config))
3417       config)))
3418
3419 (defun gnus-restore-hidden-threads-configuration (config)
3420   "Restore hidden threads configuration from CONFIG."
3421   (save-excursion
3422     (let (point (inhibit-read-only t))
3423       (while (setq point (pop config))
3424         (when (and (< point (point-max))
3425                    (goto-char point)
3426                    (eq (char-after) ?\n))
3427           (subst-char-in-region point (1+ point) ?\n ?\r))))))
3428
3429 ;; Various summary mode internalish functions.
3430
3431 (defun gnus-mouse-pick-article (e)
3432   (interactive "e")
3433   (mouse-set-point e)
3434   (gnus-summary-next-page nil t))
3435
3436 (defun gnus-summary-set-display-table ()
3437   "Change the display table.
3438 Odd characters have a tendency to mess
3439 up nicely formatted displays - we make all possible glyphs
3440 display only a single character."
3441
3442   ;; We start from the standard display table, if any.
3443   (let ((table (or (copy-sequence standard-display-table)
3444                    (make-display-table)))
3445         (i 32))
3446     ;; Nix out all the control chars...
3447     (while (>= (setq i (1- i)) 0)
3448       (gnus-put-display-table i [??] table))
3449    ;; ... but not newline and cr, of course.  (cr is necessary for the
3450     ;; selective display).
3451     (gnus-put-display-table ?\n nil table)
3452     (gnus-put-display-table ?\r nil table)
3453     ;; We keep TAB as well.
3454     (gnus-put-display-table ?\t nil table)
3455     ;; We nix out any glyphs 127 through 255, or 127 through 159 in
3456     ;; Emacs 23 (unicode), that are not set already.
3457     (let ((i (if (ignore-errors (= (make-char 'latin-iso8859-1 160) 160))
3458                  160
3459                256)))
3460       (while (>= (setq i (1- i)) 127)
3461         ;; Only modify if the entry is nil.
3462         (unless (gnus-get-display-table i table)
3463           (gnus-put-display-table i [??] table))))
3464     (setq buffer-display-table table)))
3465
3466 (defun gnus-summary-set-article-display-arrow (pos)
3467   "Update the overlay arrow to point to line at position POS."
3468   (when gnus-summary-display-arrow
3469     (make-local-variable 'overlay-arrow-position)
3470     (make-local-variable 'overlay-arrow-string)
3471     (save-excursion
3472       (goto-char pos)
3473       (beginning-of-line)
3474       (unless overlay-arrow-position
3475         (setq overlay-arrow-position (make-marker)))
3476       (setq overlay-arrow-string "=>"
3477             overlay-arrow-position (set-marker overlay-arrow-position
3478                                                (point)
3479                                                (current-buffer))))))
3480
3481 (defun gnus-summary-setup-buffer (group)
3482   "Initialize summary buffer."
3483   (let ((buffer (gnus-summary-buffer-name group))
3484         (dead-name (concat "*Dead Summary "
3485                            (gnus-group-decoded-name group) "*")))
3486     ;; If a dead summary buffer exists, we kill it.
3487     (when (gnus-buffer-live-p dead-name)
3488       (gnus-kill-buffer dead-name))
3489     (if (get-buffer buffer)
3490         (progn
3491           (set-buffer buffer)
3492           (setq gnus-summary-buffer (current-buffer))
3493           (not gnus-newsgroup-prepared))
3494       ;; Fix by Sudish Joseph <joseph@cis.ohio-state.edu>
3495       (setq gnus-summary-buffer (set-buffer (gnus-get-buffer-create buffer)))
3496       (gnus-summary-mode group)
3497       (when gnus-carpal
3498         (gnus-carpal-setup-buffer 'summary))
3499       (when (gnus-group-quit-config group)
3500         (set (make-local-variable 'gnus-single-article-buffer) nil))
3501       (make-local-variable 'gnus-article-buffer)
3502       (make-local-variable 'gnus-article-current)
3503       (make-local-variable 'gnus-original-article-buffer)
3504       (setq gnus-newsgroup-name group)
3505       ;; Set any local variables in the group parameters.
3506       (gnus-summary-set-local-parameters gnus-newsgroup-name)
3507       t)))
3508
3509 (defun gnus-set-global-variables ()
3510   "Set the global equivalents of the buffer-local variables.
3511 They are set to the latest values they had.  These reflect the summary
3512 buffer that was in action when the last article was fetched."
3513   (when (eq major-mode 'gnus-summary-mode)
3514     (setq gnus-summary-buffer (current-buffer))
3515     (let ((name gnus-newsgroup-name)
3516           (marked gnus-newsgroup-marked)
3517           (spam gnus-newsgroup-spam-marked)
3518           (unread gnus-newsgroup-unreads)
3519           (headers gnus-current-headers)
3520           (data gnus-newsgroup-data)
3521           (summary gnus-summary-buffer)
3522           (article-buffer gnus-article-buffer)
3523           (original gnus-original-article-buffer)
3524           (gac gnus-article-current)
3525           (reffed gnus-reffed-article-number)
3526           (score-file gnus-current-score-file)
3527           (default-charset gnus-newsgroup-charset)
3528           vlist)
3529       (let ((locals gnus-newsgroup-variables))
3530         (while locals
3531           (if (consp (car locals))
3532               (push (eval (caar locals)) vlist)
3533             (push (eval (car locals)) vlist))
3534           (setq locals (cdr locals)))
3535         (setq vlist (nreverse vlist)))
3536       (with-current-buffer gnus-group-buffer
3537         (setq gnus-newsgroup-name name
3538               gnus-newsgroup-marked marked
3539               gnus-newsgroup-spam-marked spam
3540               gnus-newsgroup-unreads unread
3541               gnus-current-headers headers
3542               gnus-newsgroup-data data
3543               gnus-article-current gac
3544               gnus-summary-buffer summary
3545               gnus-article-buffer article-buffer
3546               gnus-original-article-buffer original
3547               gnus-reffed-article-number reffed
3548               gnus-current-score-file score-file
3549               gnus-newsgroup-charset default-charset)
3550         (let ((locals gnus-newsgroup-variables))
3551           (while locals
3552             (if (consp (car locals))
3553                 (set (caar locals) (pop vlist))
3554               (set (car locals) (pop vlist)))
3555             (setq locals (cdr locals))))
3556         ;; The article buffer also has local variables.
3557         (when (gnus-buffer-live-p gnus-article-buffer)
3558           (set-buffer gnus-article-buffer)
3559           (setq gnus-summary-buffer summary))))))
3560
3561 (defun gnus-summary-article-unread-p (article)
3562   "Say whether ARTICLE is unread or not."
3563   (memq article gnus-newsgroup-unreads))
3564
3565 (defun gnus-summary-first-article-p (&optional article)
3566   "Return whether ARTICLE is the first article in the buffer."
3567   (if (not (setq article (or article (gnus-summary-article-number))))
3568       nil
3569     (eq article (caar gnus-newsgroup-data))))
3570
3571 (defun gnus-summary-last-article-p (&optional article)
3572   "Return whether ARTICLE is the last article in the buffer."
3573   (if (not (setq article (or article (gnus-summary-article-number))))
3574       ;; All non-existent numbers are the last article.  :-)
3575       t
3576     (not (cdr (gnus-data-find-list article)))))
3577
3578 (defun gnus-make-thread-indent-array (&optional n)
3579   (when (or n
3580             (progn (setq n 200) nil)
3581             (null gnus-thread-indent-array)
3582             (/= gnus-thread-indent-level gnus-thread-indent-array-level))
3583     (setq gnus-thread-indent-array (make-vector (1+ n) "")
3584           gnus-thread-indent-array-level gnus-thread-indent-level)
3585     (while (>= n 0)
3586       (aset gnus-thread-indent-array n
3587             (make-string (* n gnus-thread-indent-level) ? ))
3588       (setq n (1- n)))))
3589
3590 (defun gnus-update-summary-mark-positions ()
3591   "Compute where the summary marks are to go."
3592   (save-excursion
3593     (when (gnus-buffer-exists-p gnus-summary-buffer)
3594       (set-buffer gnus-summary-buffer))
3595     (let ((spec gnus-summary-line-format-spec)
3596           pos)
3597       (save-excursion
3598         (gnus-set-work-buffer)
3599         (let ((gnus-tmp-unread ?Z)
3600               (gnus-replied-mark ?Z)
3601               (gnus-score-below-mark ?Z)
3602               (gnus-score-over-mark ?Z)
3603               (gnus-undownloaded-mark ?Z)
3604               (gnus-summary-line-format-spec spec)
3605               (gnus-newsgroup-downloadable '(0))
3606               (header [0 "" "" "05 Apr 2001 23:33:09 +0400" "" "" 0 0 "" nil])
3607               case-fold-search ignores)
3608           ;; Here, all marks are bound to Z.
3609           (gnus-summary-insert-line header
3610                                     0 nil t gnus-tmp-unread t nil "" nil 1)
3611           (goto-char (point-min))
3612           ;; Memorize the positions of the same characters as dummy marks.
3613           (while (re-search-forward "[A-D]" nil t)
3614             (push (point) ignores))
3615           (erase-buffer)
3616           ;; We use A-D as dummy marks in order to know column positions
3617           ;; where marks should be inserted.
3618           (setq gnus-tmp-unread ?A
3619                 gnus-replied-mark ?B
3620                 gnus-score-below-mark ?C
3621                 gnus-score-over-mark ?C
3622                 gnus-undownloaded-mark ?D)
3623           (gnus-summary-insert-line header
3624                                     0 nil t gnus-tmp-unread t nil "" nil 1)
3625           ;; Ignore characters which aren't dummy marks.
3626           (dolist (p ignores)
3627             (delete-region (goto-char (1- p)) p)
3628             (insert ?Z))
3629           (goto-char (point-min))
3630           (setq pos (list (cons 'unread
3631                                 (and (search-forward "A" nil t)
3632                                      (- (point) (point-min) 1)))))
3633           (goto-char (point-min))
3634           (push (cons 'replied (and (search-forward "B" nil t)
3635                                     (- (point) (point-min) 1)))
3636                 pos)
3637           (goto-char (point-min))
3638           (push (cons 'score (and (search-forward "C" nil t)
3639                                   (- (point) (point-min) 1)))
3640                 pos)
3641           (goto-char (point-min))
3642           (push (cons 'download (and (search-forward "D" nil t)
3643                                      (- (point) (point-min) 1)))
3644                 pos)))
3645       (setq gnus-summary-mark-positions pos))))
3646
3647 (defun gnus-summary-insert-dummy-line (gnus-tmp-subject gnus-tmp-number)
3648   "Insert a dummy root in the summary buffer."
3649   (beginning-of-line)
3650   (gnus-add-text-properties
3651    (point) (progn (eval gnus-summary-dummy-line-format-spec) (point))
3652    (list 'gnus-number gnus-tmp-number 'gnus-intangible gnus-tmp-number)))
3653
3654 (defun gnus-summary-extract-address-component (from)
3655   (or (car (funcall gnus-extract-address-components from))
3656       from))
3657
3658 (defun gnus-summary-from-or-to-or-newsgroups (header gnus-tmp-from)
3659   (let ((mail-parse-charset gnus-newsgroup-charset)
3660         (ignored-from-addresses (gnus-ignored-from-addresses))
3661         ; Is it really necessary to do this next part for each summary line?
3662         ; Luckily, doesn't seem to slow things down much.
3663         (mail-parse-ignored-charsets
3664          (with-current-buffer gnus-summary-buffer
3665            gnus-newsgroup-ignored-charsets)))
3666     (or
3667      (and ignored-from-addresses
3668           (string-match ignored-from-addresses gnus-tmp-from)
3669           (let ((extra-headers (mail-header-extra header))
3670                 to
3671                 newsgroups)
3672             (cond
3673              ((setq to (cdr (assq 'To extra-headers)))
3674               (concat gnus-summary-to-prefix
3675                       (inline
3676                         (gnus-summary-extract-address-component
3677                          (funcall gnus-decode-encoded-address-function to)))))
3678              ((setq newsgroups
3679                     (or
3680                      (cdr (assq 'Newsgroups extra-headers))
3681                      (and
3682                       (memq 'Newsgroups gnus-extra-headers)
3683                       (eq (car (gnus-find-method-for-group
3684                                 gnus-newsgroup-name)) 'nntp)
3685                       (gnus-group-real-name gnus-newsgroup-name))))
3686               (concat gnus-summary-newsgroup-prefix newsgroups)))))
3687      (inline (gnus-summary-extract-address-component gnus-tmp-from)))))
3688
3689 (defun gnus-summary-insert-line (gnus-tmp-header
3690                                  gnus-tmp-level gnus-tmp-current
3691                                  undownloaded gnus-tmp-unread gnus-tmp-replied
3692                                  gnus-tmp-expirable gnus-tmp-subject-or-nil
3693                                  &optional gnus-tmp-dummy gnus-tmp-score
3694                                  gnus-tmp-process)
3695   (if (>= gnus-tmp-level (length gnus-thread-indent-array))
3696       (gnus-make-thread-indent-array (max (* 2 (length gnus-thread-indent-array))
3697                                           gnus-tmp-level)))
3698   (let* ((gnus-tmp-indentation (aref gnus-thread-indent-array gnus-tmp-level))
3699          (gnus-tmp-lines (mail-header-lines gnus-tmp-header))
3700          (gnus-tmp-score (or gnus-tmp-score gnus-summary-default-score 0))
3701          (gnus-tmp-score-char
3702           (if (or (null gnus-summary-default-score)
3703                   (<= (abs (- gnus-tmp-score gnus-summary-default-score))
3704                       gnus-summary-zcore-fuzz))
3705               ?                         ;Whitespace
3706             (if (< gnus-tmp-score gnus-summary-default-score)
3707                 gnus-score-below-mark gnus-score-over-mark)))
3708          (gnus-tmp-number (mail-header-number gnus-tmp-header))
3709          (gnus-tmp-replied
3710           (cond (gnus-tmp-process gnus-process-mark)
3711                 ((memq gnus-tmp-current gnus-newsgroup-cached)
3712                  gnus-cached-mark)
3713                 (gnus-tmp-replied gnus-replied-mark)
3714                 ((memq gnus-tmp-current gnus-newsgroup-forwarded)
3715                  gnus-forwarded-mark)
3716                 ((memq gnus-tmp-current gnus-newsgroup-saved)
3717                  gnus-saved-mark)
3718                 ((memq gnus-tmp-number gnus-newsgroup-recent)
3719                  gnus-recent-mark)
3720                 ((memq gnus-tmp-number gnus-newsgroup-unseen)
3721                  gnus-unseen-mark)
3722                 (t gnus-no-mark)))
3723          (gnus-tmp-downloaded
3724           (cond (undownloaded
3725                  gnus-undownloaded-mark)
3726                 (gnus-newsgroup-agentized
3727                  gnus-downloaded-mark)
3728                 (t
3729                  gnus-no-mark)))
3730          (gnus-tmp-from (mail-header-from gnus-tmp-header))
3731          (gnus-tmp-name
3732           (cond
3733            ((string-match "<[^>]+> *$" gnus-tmp-from)
3734             (let ((beg (match-beginning 0)))
3735               (or (and (string-match "^\".+\"" gnus-tmp-from)
3736                        (substring gnus-tmp-from 1 (1- (match-end 0))))
3737                   (substring gnus-tmp-from 0 beg))))
3738            ((string-match "(.+)" gnus-tmp-from)
3739             (substring gnus-tmp-from
3740                        (1+ (match-beginning 0)) (1- (match-end 0))))
3741            (t gnus-tmp-from)))
3742          (gnus-tmp-subject (mail-header-subject gnus-tmp-header))
3743          (gnus-tmp-opening-bracket (if gnus-tmp-dummy ?\< ?\[))
3744          (gnus-tmp-closing-bracket (if gnus-tmp-dummy ?\> ?\]))
3745          (inhibit-read-only t))
3746     (when (string= gnus-tmp-name "")
3747       (setq gnus-tmp-name gnus-tmp-from))
3748     (unless (numberp gnus-tmp-lines)
3749       (setq gnus-tmp-lines -1))
3750     (if (= gnus-tmp-lines -1)
3751         (setq gnus-tmp-lines "?")
3752       (setq gnus-tmp-lines (number-to-string gnus-tmp-lines)))
3753     (condition-case ()
3754         (gnus-put-text-property
3755          (point)
3756          (progn (eval gnus-summary-line-format-spec) (point))
3757          'gnus-number gnus-tmp-number)
3758       (error (gnus-message 5 "Error updating the summary line")))
3759     (when (gnus-visual-p 'summary-highlight 'highlight)
3760       (forward-line -1)
3761       (gnus-run-hooks 'gnus-summary-update-hook)
3762       (forward-line 1))))
3763
3764 (defun gnus-summary-update-line (&optional dont-update)
3765   "Update summary line after change."
3766   (when (and gnus-summary-default-score
3767              (not gnus-summary-inhibit-highlight))
3768     (let* ((gnus-summary-inhibit-highlight t) ; Prevent recursion.
3769            (article (gnus-summary-article-number))
3770            (score (gnus-summary-article-score article)))
3771       (unless dont-update
3772         (if (and gnus-summary-mark-below
3773                  (< (gnus-summary-article-score)
3774                     gnus-summary-mark-below))
3775             ;; This article has a low score, so we mark it as read.
3776             (when (memq article gnus-newsgroup-unreads)
3777               (gnus-summary-mark-article-as-read gnus-low-score-mark))
3778           (when (eq (gnus-summary-article-mark) gnus-low-score-mark)
3779             ;; This article was previously marked as read on account
3780             ;; of a low score, but now it has risen, so we mark it as
3781             ;; unread.
3782             (gnus-summary-mark-article-as-unread gnus-unread-mark)))
3783         (gnus-summary-update-mark
3784          (if (or (null gnus-summary-default-score)
3785                  (<= (abs (- score gnus-summary-default-score))
3786                      gnus-summary-zcore-fuzz))
3787              ?                          ;Whitespace
3788            (if (< score gnus-summary-default-score)
3789                gnus-score-below-mark gnus-score-over-mark))
3790          'score))
3791       ;; Do visual highlighting.
3792       (when (gnus-visual-p 'summary-highlight 'highlight)
3793         (gnus-run-hooks 'gnus-summary-update-hook)))))
3794
3795 (defvar gnus-tmp-new-adopts nil)
3796
3797 (defun gnus-summary-number-of-articles-in-thread (thread &optional level char)
3798   "Return the number of articles in THREAD.
3799 This may be 0 in some cases -- if none of the articles in
3800 the thread are to be displayed."
3801   (let* ((number
3802          ;; Fix by Luc Van Eycken <Luc.VanEycken@esat.kuleuven.ac.be>.
3803           (cond
3804            ((not (listp thread))
3805             1)
3806            ((and (consp thread) (cdr thread))
3807             (apply
3808              '+ 1 (mapcar
3809                    'gnus-summary-number-of-articles-in-thread (cdr thread))))
3810            ((null thread)
3811             1)
3812            ((memq (mail-header-number (car thread)) gnus-newsgroup-limit)
3813             1)
3814            (t 0))))
3815     (when (and level (zerop level) gnus-tmp-new-adopts)
3816       (incf number
3817             (apply '+ (mapcar
3818                        'gnus-summary-number-of-articles-in-thread
3819                        gnus-tmp-new-adopts))))
3820     (if char
3821         (if (> number 1) gnus-not-empty-thread-mark
3822           gnus-empty-thread-mark)
3823       number)))
3824
3825 (defsubst gnus-summary-line-message-size (head)
3826   "Return pretty-printed version of message size.
3827 This function is intended to be used in
3828 `gnus-summary-line-format-alist'."
3829   (let ((c (or (mail-header-chars head) -1)))
3830     (cond ((< c 0) "n/a")               ; chars not available
3831           ((< c (* 1000 10)) (format "%1.1fk" (/ c 1024.0)))
3832           ((< c (* 1000 100)) (format "%dk" (/ c 1024.0)))
3833           ((< c (* 1000 10000)) (format "%1.1fM" (/ c (* 1024.0 1024))))
3834           (t (format "%dM" (/ c (* 1024.0 1024)))))))
3835
3836
3837 (defun gnus-summary-set-local-parameters (group)
3838   "Go through the local params of GROUP and set all variable specs in that list."
3839   (let ((vars '(quit-config)))          ; Ignore quit-config.
3840     (dolist (elem (gnus-group-find-parameter group))
3841       (and (consp elem)                 ; Has to be a cons.
3842            (consp (cdr elem))           ; The cdr has to be a list.
3843            (symbolp (car elem))         ; Has to be a symbol in there.
3844            (not (memq (car elem) vars))
3845            (ignore-errors
3846              (push (car elem) vars)
3847              ;; Variables like `gnus-show-threads' that are globally
3848              ;; bound, if used as group parameters, need to get to be
3849              ;; buffer-local, whereas just parameters like `gcc-self',
3850              ;; `timestamp', etc. should not be bound as variables.
3851              (if (boundp (car elem))
3852                  (set (make-local-variable (car elem)) (eval (nth 1 elem)))
3853                (eval (nth 1 elem))))))))
3854
3855 (defun gnus-summary-read-group (group &optional show-all no-article
3856                                       kill-buffer no-display backward
3857                                       select-articles)
3858   "Start reading news in newsgroup GROUP.
3859 If SHOW-ALL is non-nil, already read articles are also listed.
3860 If NO-ARTICLE is non-nil, no article is selected initially.
3861 If NO-DISPLAY, don't generate a summary buffer."
3862   (let (result)
3863     (while (and group
3864                 (null (setq result
3865                             (let ((gnus-auto-select-next nil))
3866                               (or (gnus-summary-read-group-1
3867                                    group show-all no-article
3868                                    kill-buffer no-display
3869                                    select-articles)
3870                                   (setq show-all nil
3871                                         select-articles nil)))))
3872                 (eq gnus-auto-select-next 'quietly))
3873       (set-buffer gnus-group-buffer)
3874       ;; The entry function called above goes to the next
3875       ;; group automatically, so we go two groups back
3876       ;; if we are searching for the previous group.
3877       (when backward
3878         (gnus-group-prev-unread-group 2))
3879       (if (not (equal group (gnus-group-group-name)))
3880           (setq group (gnus-group-group-name))
3881         (setq group nil)))
3882     result))
3883
3884 (defun gnus-summary-read-group-1 (group show-all no-article
3885                                         kill-buffer no-display
3886                                         &optional select-articles)
3887   ;; Killed foreign groups can't be entered.
3888   ;;  (when (and (not (gnus-group-native-p group))
3889   ;;         (not (gnus-gethash group gnus-newsrc-hashtb)))
3890   ;;    (error "Dead non-native groups can't be entered"))
3891   (gnus-message 5 "Retrieving newsgroup: %s..."
3892                 (gnus-group-decoded-name group))
3893   (let* ((new-group (gnus-summary-setup-buffer group))
3894          (quit-config (gnus-group-quit-config group))
3895          (did-select (and new-group (gnus-select-newsgroup
3896                                      group show-all select-articles))))
3897     (cond
3898      ;; This summary buffer exists already, so we just select it.
3899      ((not new-group)
3900       (gnus-set-global-variables)
3901       (when kill-buffer
3902         (gnus-kill-or-deaden-summary kill-buffer))
3903       (gnus-configure-windows 'summary 'force)
3904       (gnus-set-mode-line 'summary)
3905       (gnus-summary-position-point)
3906       (message "")
3907       t)
3908      ;; We couldn't select this group.
3909      ((null did-select)
3910       (when (and (eq major-mode 'gnus-summary-mode)
3911                  (not (equal (current-buffer) kill-buffer)))
3912         (kill-buffer (current-buffer))
3913         (if (not quit-config)
3914             (progn
3915               ;; Update the info -- marks might need to be removed,
3916               ;; for instance.
3917               (gnus-summary-update-info)
3918               (set-buffer gnus-group-buffer)
3919               (gnus-group-jump-to-group group)
3920               (gnus-group-next-unread-group 1))
3921           (gnus-handle-ephemeral-exit quit-config)))
3922       (let ((grpinfo (gnus-get-info group)))
3923         (if (null (gnus-info-read grpinfo))
3924             (gnus-message 3 "Group %s contains no messages"
3925                           (gnus-group-decoded-name group))
3926           (gnus-message 3 "Can't select group")))
3927       nil)
3928      ;; The user did a `C-g' while prompting for number of articles,
3929      ;; so we exit this group.
3930      ((eq did-select 'quit)
3931       (and (eq major-mode 'gnus-summary-mode)
3932            (not (equal (current-buffer) kill-buffer))
3933            (kill-buffer (current-buffer)))
3934       (when kill-buffer
3935         (gnus-kill-or-deaden-summary kill-buffer))
3936       (if (not quit-config)
3937           (progn
3938             (set-buffer gnus-group-buffer)
3939             (gnus-group-jump-to-group group)
3940             (gnus-group-next-unread-group 1)
3941             (gnus-configure-windows 'group 'force))
3942         (gnus-handle-ephemeral-exit quit-config))
3943       ;; Finally signal the quit.
3944       (signal 'quit nil))
3945      ;; The group was successfully selected.
3946      (t
3947       (gnus-set-global-variables)
3948       ;; Save the active value in effect when the group was entered.
3949       (setq gnus-newsgroup-active
3950             (gnus-copy-sequence
3951              (gnus-active gnus-newsgroup-name)))
3952       ;; You can change the summary buffer in some way with this hook.
3953       (gnus-run-hooks 'gnus-select-group-hook)
3954       (when (memq 'summary (gnus-update-format-specifications
3955                             nil 'summary 'summary-mode 'summary-dummy))
3956         ;; The format specification for the summary line was updated,
3957         ;; so we need to update the mark positions as well.
3958         (gnus-update-summary-mark-positions))
3959       ;; Do score processing.
3960       (when gnus-use-scoring
3961         (gnus-possibly-score-headers))
3962       ;; Check whether to fill in the gaps in the threads.
3963       (when gnus-build-sparse-threads
3964         (gnus-build-sparse-threads))
3965       ;; Find the initial limit.
3966       (if show-all
3967           (let ((gnus-newsgroup-dormant nil))
3968             (gnus-summary-initial-limit show-all))
3969         (gnus-summary-initial-limit show-all))
3970       ;; Generate the summary buffer.
3971       (unless no-display
3972         (gnus-summary-prepare))
3973       (when gnus-use-trees
3974         (gnus-tree-open group)
3975         (setq gnus-summary-highlight-line-function
3976               'gnus-tree-highlight-article))
3977       ;; If the summary buffer is empty, but there are some low-scored
3978       ;; articles or some excluded dormants, we include these in the
3979       ;; buffer.
3980       (when (and (zerop (buffer-size))
3981                  (not no-display))
3982         (cond (gnus-newsgroup-dormant
3983                (gnus-summary-limit-include-dormant))
3984               ((and gnus-newsgroup-scored show-all)
3985                (gnus-summary-limit-include-expunged t))))
3986       ;; Function `gnus-apply-kill-file' must be called in this hook.
3987       (gnus-run-hooks 'gnus-apply-kill-hook)
3988       (if (and (zerop (buffer-size))
3989                (not no-display))
3990           (progn
3991             ;; This newsgroup is empty.
3992             (gnus-summary-catchup-and-exit nil t)
3993             (gnus-message 6 "No unread news")
3994             (when kill-buffer
3995               (gnus-kill-or-deaden-summary kill-buffer))
3996             ;; Return nil from this function.
3997             nil)
3998         ;; Hide conversation thread subtrees.  We cannot do this in
3999         ;; gnus-summary-prepare-hook since kill processing may not
4000         ;; work with hidden articles.
4001         (gnus-summary-maybe-hide-threads)
4002         (when kill-buffer
4003           (gnus-kill-or-deaden-summary kill-buffer))
4004         (gnus-summary-auto-select-subject)
4005         ;; Show first unread article if requested.
4006         (if (and (not no-article)
4007                  (not no-display)
4008                  gnus-newsgroup-unreads
4009                  gnus-auto-select-first)
4010             (progn
4011               (gnus-configure-windows 'summary)
4012               (let ((art (gnus-summary-article-number)))
4013                 (unless (and (not gnus-plugged)
4014                              (or (memq art gnus-newsgroup-undownloaded)
4015                                  (memq art gnus-newsgroup-downloadable)))
4016                   (gnus-summary-goto-article art))))
4017           ;; Don't select any articles.
4018           (gnus-summary-position-point)
4019           (gnus-configure-windows 'summary 'force)
4020           (gnus-set-mode-line 'summary))
4021         (when (and gnus-auto-center-group
4022                    (get-buffer-window gnus-group-buffer t))
4023           ;; Gotta use windows, because recenter does weird stuff if
4024           ;; the current buffer ain't the displayed window.
4025           (let ((owin (selected-window)))
4026             (select-window (get-buffer-window gnus-group-buffer t))
4027             (when (gnus-group-goto-group group)
4028               (recenter))
4029             (select-window owin)))
4030         ;; Mark this buffer as "prepared".
4031         (setq gnus-newsgroup-prepared t)
4032         (gnus-run-hooks 'gnus-summary-prepared-hook)
4033         (unless (gnus-ephemeral-group-p group)
4034           (gnus-group-update-group group))
4035         t)))))
4036
4037 (defun gnus-summary-auto-select-subject ()
4038   "Select the subject line on initial group entry."
4039   (goto-char (point-min))
4040   (cond
4041    ((eq gnus-auto-select-subject 'best)
4042     (gnus-summary-best-unread-subject))
4043    ((eq gnus-auto-select-subject 'unread)
4044     (gnus-summary-first-unread-subject))
4045    ((eq gnus-auto-select-subject 'unseen)
4046     (gnus-summary-first-unseen-subject))
4047    ((eq gnus-auto-select-subject 'unseen-or-unread)
4048     (gnus-summary-first-unseen-or-unread-subject))
4049    ((eq gnus-auto-select-subject 'first)
4050     ;; Do nothing.
4051     )
4052    ((functionp gnus-auto-select-subject)
4053     (funcall gnus-auto-select-subject))))
4054
4055 (defun gnus-summary-prepare ()
4056   "Generate the summary buffer."
4057   (interactive)
4058   (let ((inhibit-read-only t))
4059     (erase-buffer)
4060     (setq gnus-newsgroup-data nil
4061           gnus-newsgroup-data-reverse nil)
4062     (gnus-run-hooks 'gnus-summary-generate-hook)
4063     ;; Generate the buffer, either with threads or without.
4064     (when gnus-newsgroup-headers
4065       (gnus-summary-prepare-threads
4066        (if gnus-show-threads
4067            (gnus-sort-gathered-threads
4068             (funcall gnus-summary-thread-gathering-function
4069                      (gnus-sort-threads
4070                       (gnus-cut-threads (gnus-make-threads)))))
4071          ;; Unthreaded display.
4072          (gnus-sort-articles gnus-newsgroup-headers))))
4073     (setq gnus-newsgroup-data (nreverse gnus-newsgroup-data))
4074     ;; Call hooks for modifying summary buffer.
4075     (goto-char (point-min))
4076     (gnus-run-hooks 'gnus-summary-prepare-hook)))
4077
4078 (defsubst gnus-general-simplify-subject (subject)
4079   "Simplify subject by the same rules as `gnus-gather-threads-by-subject'."
4080   (setq subject
4081         (cond
4082          ;; Truncate the subject.
4083          (gnus-simplify-subject-functions
4084           (gnus-map-function gnus-simplify-subject-functions subject))
4085          ((numberp gnus-summary-gather-subject-limit)
4086           (setq subject (gnus-simplify-subject-re subject))
4087           (if (> (length subject) gnus-summary-gather-subject-limit)
4088               (substring subject 0 gnus-summary-gather-subject-limit)
4089             subject))
4090          ;; Fuzzily simplify it.
4091          ((eq 'fuzzy gnus-summary-gather-subject-limit)
4092           (gnus-simplify-subject-fuzzy subject))
4093          ;; Just remove the leading "Re:".
4094          (t
4095           (gnus-simplify-subject-re subject))))
4096
4097   (if (and gnus-summary-gather-exclude-subject
4098            (string-match gnus-summary-gather-exclude-subject subject))
4099       nil                         ; This article shouldn't be gathered
4100     subject))
4101
4102 (defun gnus-summary-simplify-subject-query ()
4103   "Query where the respool algorithm would put this article."
4104   (interactive)
4105   (gnus-summary-select-article)
4106   (message "%s" (gnus-general-simplify-subject (gnus-summary-article-subject))))
4107
4108 (defun gnus-gather-threads-by-subject (threads)
4109   "Gather threads by looking at Subject headers."
4110   (if (not gnus-summary-make-false-root)
4111       threads
4112     (let ((hashtb (gnus-make-hashtable 1024))
4113           (prev threads)
4114           (result threads)
4115           subject hthread whole-subject)
4116       (while threads
4117         (setq subject (gnus-general-simplify-subject
4118                        (setq whole-subject (mail-header-subject
4119                                             (caar threads)))))
4120         (when subject
4121           (if (setq hthread (gnus-gethash subject hashtb))
4122               (progn
4123                 ;; We enter a dummy root into the thread, if we
4124                 ;; haven't done that already.
4125                 (unless (stringp (caar hthread))
4126                   (setcar hthread (list whole-subject (car hthread))))
4127                 ;; We add this new gathered thread to this gathered
4128                 ;; thread.
4129                 (setcdr (car hthread)
4130                         (nconc (cdar hthread) (list (car threads))))
4131                 ;; Remove it from the list of threads.
4132                 (setcdr prev (cdr threads))
4133                 (setq threads prev))
4134             ;; Enter this thread into the hash table.
4135             (gnus-sethash subject
4136                           (if gnus-summary-make-false-root-always
4137                               (progn
4138                                 ;; If you want a dummy root above all
4139                                 ;; threads...
4140                                 (setcar threads (list whole-subject
4141                                                       (car threads)))
4142                                 threads)
4143                             threads)
4144                           hashtb)))
4145         (setq prev threads)
4146         (setq threads (cdr threads)))
4147       result)))
4148
4149 (defun gnus-gather-threads-by-references (threads)
4150   "Gather threads by looking at References headers."
4151   (let ((idhashtb (gnus-make-hashtable 1024))
4152         (thhashtb (gnus-make-hashtable 1024))
4153         (prev threads)
4154         (result threads)
4155         ids references id gthread gid entered ref)
4156     (while threads
4157       (when (setq references (mail-header-references (caar threads)))
4158         (setq id (mail-header-id (caar threads))
4159               ids (inline (gnus-split-references references))
4160               entered nil)
4161         (while (setq ref (pop ids))
4162           (setq ids (delete ref ids))
4163           (if (not (setq gid (gnus-gethash ref idhashtb)))
4164               (progn
4165                 (gnus-sethash ref id idhashtb)
4166                 (gnus-sethash id threads thhashtb))
4167             (setq gthread (gnus-gethash gid thhashtb))
4168             (unless entered
4169               ;; We enter a dummy root into the thread, if we
4170               ;; haven't done that already.
4171               (unless (stringp (caar gthread))
4172                 (setcar gthread (list (mail-header-subject (caar gthread))
4173                                       (car gthread))))
4174               ;; We add this new gathered thread to this gathered
4175               ;; thread.
4176               (setcdr (car gthread)
4177                       (nconc (cdar gthread) (list (car threads)))))
4178             ;; Add it into the thread hash table.
4179             (gnus-sethash id gthread thhashtb)
4180             (setq entered t)
4181             ;; Remove it from the list of threads.
4182             (setcdr prev (cdr threads))
4183             (setq threads prev))))
4184       (setq prev threads)
4185       (setq threads (cdr threads)))
4186     result))
4187
4188 (defun gnus-sort-gathered-threads (threads)
4189   "Sort subtreads inside each gathered thread by `gnus-sort-gathered-threads-function'."
4190   (let ((result threads))
4191     (while threads
4192       (when (stringp (caar threads))
4193         (setcdr (car threads)
4194                 (sort (cdar threads) gnus-sort-gathered-threads-function)))
4195       (setq threads (cdr threads)))
4196     result))
4197
4198 (defun gnus-thread-loop-p (root thread)
4199   "Say whether ROOT is in THREAD."
4200   (let ((stack (list thread))
4201         (infloop 0)
4202         th)
4203     (while (setq thread (pop stack))
4204       (setq th (cdr thread))
4205       (while (and th
4206                   (not (eq (caar th) root)))
4207         (pop th))
4208       (if th
4209           ;; We have found a loop.
4210           (let (ref-dep)
4211             (setcdr thread (delq (car th) (cdr thread)))
4212             (if (boundp (setq ref-dep (intern "none"
4213                                               gnus-newsgroup-dependencies)))
4214                 (setcdr (symbol-value ref-dep)
4215                         (nconc (cdr (symbol-value ref-dep))
4216                                (list (car th))))
4217               (set ref-dep (list nil (car th))))
4218             (setq infloop 1
4219                   stack nil))
4220         ;; Push all the subthreads onto the stack.
4221         (push (cdr thread) stack)))
4222     infloop))
4223
4224 (defun gnus-make-threads ()
4225   "Go through the dependency hashtb and find the roots.  Return all threads."
4226   (let (threads)
4227     (while (catch 'infloop
4228              (mapatoms
4229               (lambda (refs)
4230                 ;; Deal with self-referencing References loops.
4231                 (when (and (car (symbol-value refs))
4232                            (not (zerop
4233                                  (apply
4234                                   '+
4235                                   (mapcar
4236                                    (lambda (thread)
4237                                      (gnus-thread-loop-p
4238                                       (car (symbol-value refs)) thread))
4239                                    (cdr (symbol-value refs)))))))
4240                   (setq threads nil)
4241                   (throw 'infloop t))
4242                 (unless (car (symbol-value refs))
4243                   ;; These threads do not refer back to any other
4244                   ;; articles, so they're roots.
4245                   (setq threads (append (cdr (symbol-value refs)) threads))))
4246               gnus-newsgroup-dependencies)))
4247     threads))
4248
4249 ;; Build the thread tree.
4250 (defsubst gnus-dependencies-add-header (header dependencies force-new)
4251   "Enter HEADER into the DEPENDENCIES table if it is not already there.
4252
4253 If FORCE-NEW is not nil, enter HEADER into the DEPENDENCIES table even
4254 if it was already present.
4255
4256 If `gnus-summary-ignore-duplicates' is nil then duplicate Message-IDs
4257 will not be entered in the DEPENDENCIES table.  Otherwise duplicate
4258 Message-IDs will be renamed to a unique Message-ID before being
4259 entered.
4260
4261 Returns HEADER if it was entered in the DEPENDENCIES.  Returns nil otherwise."
4262   (let* ((id (mail-header-id header))
4263          (id-dep (and id (intern id dependencies)))
4264          parent-id ref ref-dep ref-header replaced)
4265     ;; Enter this `header' in the `dependencies' table.
4266     (cond
4267      ((not id-dep)
4268       (setq header nil))
4269      ;; The first two cases do the normal part: enter a new `header'
4270      ;; in the `dependencies' table.
4271      ((not (boundp id-dep))
4272       (set id-dep (list header)))
4273      ((null (car (symbol-value id-dep)))
4274       (setcar (symbol-value id-dep) header))
4275
4276      ;; From here the `header' was already present in the
4277      ;; `dependencies' table.
4278      (force-new
4279       ;; Overrides an existing entry;
4280       ;; just set the header part of the entry.
4281       (setcar (symbol-value id-dep) header)
4282       (setq replaced t))
4283
4284      ;; Renames the existing `header' to a unique Message-ID.
4285      ((not gnus-summary-ignore-duplicates)
4286       ;; An article with this Message-ID has already been seen.
4287       ;; We rename the Message-ID.
4288       (set (setq id-dep (intern (setq id (nnmail-message-id)) dependencies))
4289            (list header))
4290       (mail-header-set-id header id))
4291
4292      ;; The last case ignores an existing entry, except it adds any
4293      ;; additional Xrefs (in case the two articles came from different
4294      ;; servers.
4295      ;; Also sets `header' to `nil' meaning that the `dependencies'
4296      ;; table was *not* modified.
4297      (t
4298       (mail-header-set-xref
4299        (car (symbol-value id-dep))
4300        (concat (or (mail-header-xref (car (symbol-value id-dep)))
4301                    "")
4302                (or (mail-header-xref header) "")))
4303       (setq header nil)))
4304
4305     (when (and header (not replaced))
4306       ;; First check that we are not creating a References loop.
4307       (setq parent-id (gnus-parent-id (mail-header-references header)))
4308       (setq ref parent-id)
4309       (while (and ref
4310                   (setq ref-dep (intern-soft ref dependencies))
4311                   (boundp ref-dep)
4312                   (setq ref-header (car (symbol-value ref-dep))))
4313         (if (string= id ref)
4314             ;; Yuk!  This is a reference loop.  Make the article be a
4315             ;; root article.
4316             (progn
4317               (mail-header-set-references (car (symbol-value id-dep)) "none")
4318               (setq ref nil)
4319               (setq parent-id nil))
4320           (setq ref (gnus-parent-id (mail-header-references ref-header)))))
4321       (setq ref-dep (intern (or parent-id "none") dependencies))
4322       (if (boundp ref-dep)
4323           (setcdr (symbol-value ref-dep)
4324                   (nconc (cdr (symbol-value ref-dep))
4325                          (list (symbol-value id-dep))))
4326         (set ref-dep (list nil (symbol-value id-dep)))))
4327     header))
4328
4329 (defun gnus-extract-message-id-from-in-reply-to (string)
4330   (if (string-match "<[^>]+>" string)
4331       (substring string (match-beginning 0) (match-end 0))
4332     nil))
4333
4334 (defun gnus-build-sparse-threads ()
4335   (let ((headers gnus-newsgroup-headers)
4336         (mail-parse-charset gnus-newsgroup-charset)
4337         (gnus-summary-ignore-duplicates t)
4338         header references generation relations
4339         subject child end new-child date)
4340     ;; First we create an alist of generations/relations, where
4341     ;; generations is how much we trust the relation, and the relation
4342     ;; is parent/child.
4343     (gnus-message 7 "Making sparse threads...")
4344     (save-excursion
4345       (nnheader-set-temp-buffer " *gnus sparse threads*")
4346       (while (setq header (pop headers))
4347         (when (and (setq references (mail-header-references header))
4348                    (not (string= references "")))
4349           (insert references)
4350           (setq child (mail-header-id header)
4351                 subject (mail-header-subject header)
4352                 date (mail-header-date header)
4353                 generation 0)
4354           (while (search-backward ">" nil t)
4355             (setq end (1+ (point)))
4356             (when (search-backward "<" nil t)
4357               (setq new-child (buffer-substring (point) end))
4358               (push (list (incf generation)
4359                           child (setq child new-child)
4360                           subject date)
4361                     relations)))
4362           (when child
4363             (push (list (1+ generation) child nil subject) relations))
4364           (erase-buffer)))
4365       (kill-buffer (current-buffer)))
4366     ;; Sort over trustworthiness.
4367     (dolist (relation (sort relations 'car-less-than-car))
4368       (when (gnus-dependencies-add-header
4369              (make-full-mail-header
4370               gnus-reffed-article-number
4371               (nth 3 relation) "" (or (nth 4 relation) "")
4372               (nth 1 relation)
4373               (or (nth 2 relation) "") 0 0 "")
4374              gnus-newsgroup-dependencies nil)
4375         (push gnus-reffed-article-number gnus-newsgroup-limit)
4376         (push gnus-reffed-article-number gnus-newsgroup-sparse)
4377         (push (cons gnus-reffed-article-number gnus-sparse-mark)
4378               gnus-newsgroup-reads)
4379         (decf gnus-reffed-article-number)))
4380     (gnus-message 7 "Making sparse threads...done")))
4381
4382 (defun gnus-build-old-threads ()
4383   ;; Look at all the articles that refer back to old articles, and
4384   ;; fetch the headers for the articles that aren't there.  This will
4385   ;; build complete threads - if the roots haven't been expired by the
4386   ;; server, that is.
4387   (let ((mail-parse-charset gnus-newsgroup-charset)
4388         id heads)
4389     (mapatoms
4390      (lambda (refs)
4391        (when (not (car (symbol-value refs)))
4392          (setq heads (cdr (symbol-value refs)))
4393          (while heads
4394            (if (memq (mail-header-number (caar heads))
4395                      gnus-newsgroup-dormant)
4396                (setq heads (cdr heads))
4397              (setq id (symbol-name refs))
4398              (while (and (setq id (gnus-build-get-header id))
4399                          (not (car (gnus-id-to-thread id)))))
4400              (setq heads nil)))))
4401      gnus-newsgroup-dependencies)))
4402
4403 (defsubst gnus-remove-odd-characters (string)
4404   "Translate STRING into something that doesn't contain weird characters."
4405   (mm-subst-char-in-string
4406    ?\r ?\-
4407    (mm-subst-char-in-string ?\n ?\- string t) t))
4408
4409 ;; This function has to be called with point after the article number
4410 ;; on the beginning of the line.
4411 (defsubst gnus-nov-parse-line (number dependencies &optional force-new)
4412   (let ((eol (point-at-eol))
4413         (buffer (current-buffer))
4414         header references in-reply-to)
4415
4416     ;; overview: [num subject from date id refs chars lines misc]
4417     (unwind-protect
4418         (let (x)
4419           (narrow-to-region (point) eol)
4420           (unless (eobp)
4421             (forward-char))
4422
4423           (setq header
4424                 (make-full-mail-header
4425                  number                 ; number
4426                  (condition-case ()     ; subject
4427                      (gnus-remove-odd-characters
4428                       (funcall gnus-decode-encoded-word-function
4429                                (setq x (nnheader-nov-field))))
4430                    (error x))
4431                  (condition-case ()     ; from
4432                      (gnus-remove-odd-characters
4433                       (funcall gnus-decode-encoded-address-function
4434                                (setq x (nnheader-nov-field))))
4435                    (error x))
4436                  (nnheader-nov-field)   ; date
4437                  (nnheader-nov-read-message-id number)  ; id
4438                  (setq references (nnheader-nov-field)) ; refs
4439                  (nnheader-nov-read-integer) ; chars
4440                  (nnheader-nov-read-integer) ; lines
4441                  (unless (eobp)
4442                    (if (looking-at "Xref: ")
4443                        (goto-char (match-end 0)))
4444                    (nnheader-nov-field)) ; Xref
4445                  (nnheader-nov-parse-extra)))) ; extra
4446
4447       (widen))
4448
4449     (when (and (string= references "")
4450                (setq in-reply-to (mail-header-extra header))
4451                (setq in-reply-to (cdr (assq 'In-Reply-To in-reply-to))))
4452       (mail-header-set-references
4453        header (gnus-extract-message-id-from-in-reply-to in-reply-to)))
4454
4455     (when gnus-alter-header-function
4456       (funcall gnus-alter-header-function header))
4457     (gnus-dependencies-add-header header dependencies force-new)))
4458
4459 (defun gnus-build-get-header (id)
4460   "Look through the buffer of NOV lines and find the header to ID.
4461 Enter this line into the dependencies hash table, and return
4462 the id of the parent article (if any)."
4463   (let ((deps gnus-newsgroup-dependencies)
4464         found header)
4465     (prog1
4466         (with-current-buffer nntp-server-buffer
4467           (let ((case-fold-search nil))
4468             (goto-char (point-min))
4469             (while (and (not found)
4470                         (search-forward id nil t))
4471               (beginning-of-line)
4472               (setq found (looking-at
4473                            (format "^[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t%s"
4474                                    (regexp-quote id))))
4475               (or found (beginning-of-line 2)))
4476             (when found
4477               (beginning-of-line)
4478               (and
4479                (setq header (gnus-nov-parse-line
4480                              (read (current-buffer)) deps))
4481                (gnus-parent-id (mail-header-references header))))))
4482       (when header
4483         (let ((number (mail-header-number header)))
4484           (push number gnus-newsgroup-limit)
4485           (push header gnus-newsgroup-headers)
4486           (if (memq number gnus-newsgroup-unselected)
4487               (progn
4488                 (setq gnus-newsgroup-unreads
4489                       (gnus-add-to-sorted-list gnus-newsgroup-unreads
4490                                                number))
4491                 (setq gnus-newsgroup-unselected
4492                       (delq number gnus-newsgroup-unselected)))
4493             (push number gnus-newsgroup-ancient)))))))
4494
4495 (defun gnus-build-all-threads ()
4496   "Read all the headers."
4497   (let ((gnus-summary-ignore-duplicates t)
4498         (mail-parse-charset gnus-newsgroup-charset)
4499         (dependencies gnus-newsgroup-dependencies)
4500         header article)
4501     (with-current-buffer nntp-server-buffer
4502       (let ((case-fold-search nil))
4503         (goto-char (point-min))
4504         (while (not (eobp))
4505           (ignore-errors
4506             (setq article (read (current-buffer))
4507                   header (gnus-nov-parse-line article dependencies)))
4508           (when header
4509             (with-current-buffer gnus-summary-buffer
4510               (push header gnus-newsgroup-headers)
4511               (if (memq (setq article (mail-header-number header))
4512                         gnus-newsgroup-unselected)
4513                   (progn
4514                     (setq gnus-newsgroup-unreads
4515                           (gnus-add-to-sorted-list
4516                            gnus-newsgroup-unreads article))
4517                     (setq gnus-newsgroup-unselected
4518                           (delq article gnus-newsgroup-unselected)))
4519                 (push article gnus-newsgroup-ancient)))
4520             (forward-line 1)))))))
4521
4522 (defun gnus-summary-update-article-line (article header)
4523   "Update the line for ARTICLE using HEADER."
4524   (let* ((id (mail-header-id header))
4525          (thread (gnus-id-to-thread id)))
4526     (unless thread
4527       (error "Article in no thread"))
4528     ;; Update the thread.
4529     (setcar thread header)
4530     (gnus-summary-goto-subject article)
4531     (let* ((datal (gnus-data-find-list article))
4532            (data (car datal))
4533            (inhibit-read-only t)
4534            (level (gnus-summary-thread-level)))
4535       (gnus-delete-line)
4536       (let ((inserted (- (point)
4537                          (progn
4538                            (gnus-summary-insert-line
4539                             header level nil
4540                             (memq article gnus-newsgroup-undownloaded)
4541                             (gnus-article-mark article)
4542                             (memq article gnus-newsgroup-replied)
4543                             (memq article gnus-newsgroup-expirable)
4544                             ;; Only insert the Subject string when it's different
4545                             ;; from the previous Subject string.
4546                             (if (and
4547                                  gnus-show-threads
4548                                  (gnus-subject-equal
4549                                   (condition-case ()
4550                                       (mail-header-subject
4551                                        (gnus-data-header
4552                                         (cadr
4553                                          (gnus-data-find-list
4554                                           article
4555                                           (gnus-data-list t)))))
4556                                     ;; Error on the side of excessive subjects.
4557                                     (error ""))
4558                                   (mail-header-subject header)))
4559                                 ""
4560                               (mail-header-subject header))
4561                             nil (cdr (assq article gnus-newsgroup-scored))
4562                             (memq article gnus-newsgroup-processable))
4563                            (point)))))
4564         (when (cdr datal)
4565           (gnus-data-update-list
4566            (cdr datal)
4567            (- (gnus-data-pos data) (gnus-data-pos (cadr datal)) inserted)))))))
4568
4569 (defun gnus-summary-update-article (article &optional iheader)
4570   "Update ARTICLE in the summary buffer."
4571   (set-buffer gnus-summary-buffer)
4572   (let* ((header (gnus-summary-article-header article))
4573          (id (mail-header-id header))
4574          (data (gnus-data-find article))
4575          (thread (gnus-id-to-thread id))
4576          (references (mail-header-references header))
4577          (parent
4578           (gnus-id-to-thread
4579            (or (gnus-parent-id
4580                 (when (and references
4581                            (not (equal "" references)))
4582                   references))
4583                "none")))
4584          (inhibit-read-only t)
4585          (old (car thread)))
4586     (when thread
4587       (unless iheader
4588         (setcar thread nil)
4589         (when parent
4590           (delq thread parent)))
4591       (if (gnus-summary-insert-subject id header)
4592           ;; Set the (possibly) new article number in the data structure.
4593           (gnus-data-set-number data (gnus-id-to-article id))
4594         (setcar thread old)
4595         nil))))
4596
4597 (defun gnus-rebuild-thread (id &optional line)
4598   "Rebuild the thread containing ID.
4599 If LINE, insert the rebuilt thread starting on line LINE."
4600   (let ((inhibit-read-only t)
4601         old-pos current thread data)
4602     (if (not gnus-show-threads)
4603         (setq thread (list (car (gnus-id-to-thread id))))
4604       ;; Get the thread this article is part of.
4605       (setq thread (gnus-remove-thread id)))
4606     (setq old-pos (point-at-bol))
4607     (setq current (save-excursion
4608                     (and (re-search-backward "[\r\n]" nil t)
4609                          (gnus-summary-article-number))))
4610     ;; If this is a gathered thread, we have to go some re-gathering.
4611     (when (stringp (car thread))
4612       (let ((subject (car thread))
4613             roots thr)
4614         (setq thread (cdr thread))
4615         (while thread
4616           (unless (memq (setq thr (gnus-id-to-thread
4617                                    (gnus-root-id
4618                                     (mail-header-id (caar thread)))))
4619                         roots)
4620             (push thr roots))
4621           (setq thread (cdr thread)))
4622         ;; We now have all (unique) roots.
4623         (if (= (length roots) 1)
4624             ;; All the loose roots are now one solid root.
4625             (setq thread (car roots))
4626           (setq thread (cons subject (gnus-sort-threads roots))))))
4627     (let (threads)
4628       ;; We then insert this thread into the summary buffer.
4629       (when line
4630         (goto-char (point-min))
4631         (forward-line (1- line)))
4632       (let (gnus-newsgroup-data gnus-newsgroup-threads)
4633         (if gnus-show-threads
4634             (gnus-summary-prepare-threads (gnus-cut-threads (list thread)))
4635           (gnus-summary-prepare-unthreaded thread))
4636         (setq data (nreverse gnus-newsgroup-data))
4637         (setq threads gnus-newsgroup-threads))
4638       ;; We splice the new data into the data structure.
4639       ;;!!! This is kinda bogus.  We assume that in LINE is non-nil,
4640       ;;!!! then we want to insert at the beginning of the buffer.
4641       ;;!!! That happens to be true with Gnus now, but that may
4642       ;;!!! change in the future.  Perhaps.
4643       (gnus-data-enter-list
4644        (if line nil current) data (- (point) old-pos))
4645       (setq gnus-newsgroup-threads
4646             (nconc threads gnus-newsgroup-threads))
4647       (gnus-data-compute-positions))))
4648
4649 (defun gnus-number-to-header (number)
4650   "Return the header for article NUMBER."
4651   (let ((headers gnus-newsgroup-headers))
4652     (while (and headers
4653                 (not (= number (mail-header-number (car headers)))))
4654       (pop headers))
4655     (when headers
4656       (car headers))))
4657
4658 (defun gnus-parent-headers (in-headers &optional generation)
4659   "Return the headers of the GENERATIONeth parent of HEADERS."
4660   (unless generation
4661     (setq generation 1))
4662   (let ((parent t)
4663         (headers in-headers)
4664         references)
4665     (while (and parent
4666                 (not (zerop generation))
4667                 (setq references (mail-header-references headers)))
4668       (setq headers (if (and references
4669                              (setq parent (gnus-parent-id references)))
4670                         (car (gnus-id-to-thread parent))
4671                       nil))
4672       (decf generation))
4673     (and (not (eq headers in-headers))
4674          headers)))
4675
4676 (defun gnus-id-to-thread (id)
4677   "Return the (sub-)thread where ID appears."
4678   (gnus-gethash id gnus-newsgroup-dependencies))
4679
4680 (defun gnus-id-to-article (id)
4681   "Return the article number of ID."
4682   (let ((thread (gnus-id-to-thread id)))
4683     (when (and thread
4684                (car thread))
4685       (mail-header-number (car thread)))))
4686
4687 (defun gnus-id-to-header (id)
4688   "Return the article headers of ID."
4689   (car (gnus-id-to-thread id)))
4690
4691 (defun gnus-article-displayed-root-p (article)
4692   "Say whether ARTICLE is a root(ish) article."
4693   (let ((level (gnus-summary-thread-level article))
4694         (refs (mail-header-references  (gnus-summary-article-header article)))
4695         particle)
4696     (cond
4697      ((null level) nil)
4698      ((zerop level) t)
4699      ((null refs) t)
4700      ((null (gnus-parent-id refs)) t)
4701      ((and (= 1 level)
4702            (null (setq particle (gnus-id-to-article
4703                                  (gnus-parent-id refs))))
4704            (null (gnus-summary-thread-level particle)))))))
4705
4706 (defun gnus-root-id (id)
4707   "Return the id of the root of the thread where ID appears."
4708   (let (last-id prev)
4709     (while (and id (setq prev (car (gnus-id-to-thread id))))
4710       (setq last-id id
4711             id (gnus-parent-id (mail-header-references prev))))
4712     last-id))
4713
4714 (defun gnus-articles-in-thread (thread)
4715   "Return the list of articles in THREAD."
4716   (cons (mail-header-number (car thread))
4717         (apply 'nconc (mapcar 'gnus-articles-in-thread (cdr thread)))))
4718
4719 (defun gnus-remove-thread (id &optional dont-remove)
4720   "Remove the thread that has ID in it."
4721   (let (headers thread last-id)
4722     ;; First go up in this thread until we find the root.
4723     (setq last-id (gnus-root-id id)
4724           headers (message-flatten-list (gnus-id-to-thread last-id)))
4725     ;; We have now found the real root of this thread.  It might have
4726     ;; been gathered into some loose thread, so we have to search
4727     ;; through the threads to find the thread we wanted.
4728     (let ((threads gnus-newsgroup-threads)
4729           sub)
4730       (while threads
4731         (setq sub (car threads))
4732         (if (stringp (car sub))
4733             ;; This is a gathered thread, so we look at the roots
4734             ;; below it to find whether this article is in this
4735             ;; gathered root.
4736             (progn
4737               (setq sub (cdr sub))
4738               (while sub
4739                 (when (member (caar sub) headers)
4740                   (setq thread (car threads)
4741                         threads nil
4742                         sub nil))
4743                 (setq sub (cdr sub))))
4744           ;; It's an ordinary thread, so we check it.
4745           (when (eq (car sub) (car headers))
4746             (setq thread sub
4747                   threads nil)))
4748         (setq threads (cdr threads)))
4749       ;; If this article is in no thread, then it's a root.
4750       (if thread
4751           (unless dont-remove
4752             (setq gnus-newsgroup-threads (delq thread gnus-newsgroup-threads)))
4753         (setq thread (gnus-id-to-thread last-id)))
4754       (when thread
4755         (prog1
4756             thread                      ; We return this thread.
4757           (unless dont-remove
4758             (if (stringp (car thread))
4759                 (progn
4760                   ;; If we use dummy roots, then we have to remove the
4761                   ;; dummy root as well.
4762                   (when (eq gnus-summary-make-false-root 'dummy)
4763                     ;; We go to the dummy root by going to
4764                     ;; the first sub-"thread", and then one line up.
4765                     (gnus-summary-goto-article
4766                      (mail-header-number (caadr thread)))
4767                     (forward-line -1)
4768                     (gnus-delete-line)
4769                     (gnus-data-compute-positions))
4770                   (setq thread (cdr thread))
4771                   (while thread
4772                     (gnus-remove-thread-1 (car thread))
4773                     (setq thread (cdr thread))))
4774               (gnus-remove-thread-1 thread))))))))
4775
4776 (defun gnus-remove-thread-1 (thread)
4777   "Remove the thread THREAD recursively."
4778   (let ((number (mail-header-number (pop thread)))
4779         d)
4780     (setq thread (reverse thread))
4781     (while thread
4782       (gnus-remove-thread-1 (pop thread)))
4783     (when (setq d (gnus-data-find number))
4784       (goto-char (gnus-data-pos d))
4785       (gnus-summary-show-thread)
4786       (gnus-data-remove
4787        number
4788        (- (point-at-bol)
4789           (prog1
4790               (1+ (point-at-eol))
4791             (gnus-delete-line)))))))
4792
4793 (defun gnus-sort-threads-recursive (threads func)
4794   (sort (mapcar (lambda (thread)
4795                   (cons (car thread)
4796                         (and (cdr thread)
4797                              (gnus-sort-threads-recursive (cdr thread) func))))
4798                 threads) func))
4799
4800 (defun gnus-sort-threads-loop (threads func)
4801   (let* ((superthread (cons nil threads))
4802          (stack (list (cons superthread threads)))
4803          remaining-threads thread)
4804     (while stack
4805       (setq remaining-threads (cdr (car stack)))
4806       (if remaining-threads
4807           (progn (setq thread (car remaining-threads))
4808                  (setcdr (car stack) (cdr remaining-threads))
4809                  (if (cdr thread)
4810                      (push (cons thread (cdr thread)) stack)))
4811         (setq thread (caar stack))
4812         (setcdr thread (sort (cdr thread) func))
4813         (pop stack)))
4814     (cdr superthread)))
4815
4816 (defun gnus-sort-threads (threads)
4817   "Sort THREADS."
4818   (if (not gnus-thread-sort-functions)
4819       threads
4820     (gnus-message 8 "Sorting threads...")
4821     (prog1
4822         (condition-case nil
4823             (let ((max-lisp-eval-depth (max max-lisp-eval-depth 5000)))
4824               (gnus-sort-threads-recursive
4825                threads (gnus-make-sort-function gnus-thread-sort-functions)))
4826           ;; Even after binding max-lisp-eval-depth, the recursive
4827           ;; sorter might fail for very long threads.  In that case,
4828           ;; try using a (less well-tested) non-recursive sorter.
4829           (error (gnus-sort-threads-loop
4830                   threads (gnus-make-sort-function
4831                            gnus-thread-sort-functions))))
4832       (gnus-message 8 "Sorting threads...done"))))
4833
4834 (defun gnus-sort-articles (articles)
4835   "Sort ARTICLES."
4836   (when gnus-article-sort-functions
4837     (gnus-message 7 "Sorting articles...")
4838     (prog1
4839         (setq gnus-newsgroup-headers
4840               (sort articles (gnus-make-sort-function
4841                               gnus-article-sort-functions)))
4842       (gnus-message 7 "Sorting articles...done"))))
4843
4844 ;; Written by Hallvard B Furuseth <h.b.furuseth@usit.uio.no>.
4845 (defmacro gnus-thread-header (thread)
4846   "Return header of first article in THREAD.
4847 Note that THREAD must never, ever be anything else than a variable -
4848 using some other form will lead to serious barfage."
4849   (or (symbolp thread) (signal 'wrong-type-argument '(symbolp thread)))
4850   ;; (8% speedup to gnus-summary-prepare, just for fun :-)
4851   (list 'byte-code "\10\211:\203\17\0\211@;\203\16\0A@@\207"
4852         (vector thread) 2))
4853
4854 (defsubst gnus-article-sort-by-number (h1 h2)
4855   "Sort articles by article number."
4856   (< (mail-header-number h1)
4857      (mail-header-number h2)))
4858
4859 (defun gnus-thread-sort-by-number (h1 h2)
4860   "Sort threads by root article number."
4861   (gnus-article-sort-by-number
4862    (gnus-thread-header h1) (gnus-thread-header h2)))
4863
4864 (defsubst gnus-article-sort-by-random (h1 h2)
4865   "Sort articles randomly."
4866   (zerop (random 2)))
4867
4868 (defun gnus-thread-sort-by-random (h1 h2)
4869   "Sort threads randomly."
4870   (gnus-article-sort-by-random
4871    (gnus-thread-header h1) (gnus-thread-header h2)))
4872
4873 (defsubst gnus-article-sort-by-lines (h1 h2)
4874   "Sort articles by article Lines header."
4875   (< (mail-header-lines h1)
4876      (mail-header-lines h2)))
4877
4878 (defun gnus-thread-sort-by-lines (h1 h2)
4879   "Sort threads by root article Lines header."
4880   (gnus-article-sort-by-lines
4881    (gnus-thread-header h1) (gnus-thread-header h2)))
4882
4883 (defsubst gnus-article-sort-by-chars (h1 h2)
4884   "Sort articles by octet length."
4885   (< (mail-header-chars h1)
4886      (mail-header-chars h2)))
4887
4888 (defun gnus-thread-sort-by-chars (h1 h2)
4889   "Sort threads by root article octet length."
4890   (gnus-article-sort-by-chars
4891    (gnus-thread-header h1) (gnus-thread-header h2)))
4892
4893 (defsubst gnus-article-sort-by-author (h1 h2)
4894   "Sort articles by root author."
4895   (gnus-string<
4896    (let ((extract (funcall
4897                    gnus-extract-address-components
4898                    (mail-header-from h1))))
4899      (or (car extract) (cadr extract) ""))
4900    (let ((extract (funcall
4901                    gnus-extract-address-components
4902                    (mail-header-from h2))))
4903      (or (car extract) (cadr extract) ""))))
4904
4905 (defun gnus-thread-sort-by-author (h1 h2)
4906   "Sort threads by root author."
4907   (gnus-article-sort-by-author
4908    (gnus-thread-header h1)  (gnus-thread-header h2)))
4909
4910 (defsubst gnus-article-sort-by-recipient (h1 h2)
4911   "Sort articles by recipient."
4912   (gnus-string<
4913    (let ((extract (funcall
4914                    gnus-extract-address-components
4915                    (or (cdr (assq 'To (mail-header-extra h1))) ""))))
4916      (or (car extract) (cadr extract)))
4917    (let ((extract (funcall
4918                    gnus-extract-address-components
4919                    (or (cdr (assq 'To (mail-header-extra h2))) ""))))
4920      (or (car extract) (cadr extract)))))
4921
4922 (defun gnus-thread-sort-by-recipient (h1 h2)
4923   "Sort threads by root recipient."
4924   (gnus-article-sort-by-recipient
4925    (gnus-thread-header h1) (gnus-thread-header h2)))
4926
4927 (defsubst gnus-article-sort-by-subject (h1 h2)
4928   "Sort articles by root subject."
4929   (gnus-string<
4930    (downcase (gnus-simplify-subject-re (mail-header-subject h1)))
4931    (downcase (gnus-simplify-subject-re (mail-header-subject h2)))))
4932
4933 (defun gnus-thread-sort-by-subject (h1 h2)
4934   "Sort threads by root subject."
4935   (gnus-article-sort-by-subject
4936    (gnus-thread-header h1) (gnus-thread-header h2)))
4937
4938 (defsubst gnus-article-sort-by-date (h1 h2)
4939   "Sort articles by root article date."
4940   (time-less-p
4941    (gnus-date-get-time (mail-header-date h1))
4942    (gnus-date-get-time (mail-header-date h2))))
4943
4944 (defun gnus-thread-sort-by-date (h1 h2)
4945   "Sort threads by root article date."
4946   (gnus-article-sort-by-date
4947    (gnus-thread-header h1) (gnus-thread-header h2)))
4948
4949 (defsubst gnus-article-sort-by-score (h1 h2)
4950   "Sort articles by root article score.
4951 Unscored articles will be counted as having a score of zero."
4952   (> (or (cdr (assq (mail-header-number h1)
4953                     gnus-newsgroup-scored))
4954          gnus-summary-default-score 0)
4955      (or (cdr (assq (mail-header-number h2)
4956                     gnus-newsgroup-scored))
4957          gnus-summary-default-score 0)))
4958
4959 (defun gnus-thread-sort-by-score (h1 h2)
4960   "Sort threads by root article score."
4961   (gnus-article-sort-by-score
4962    (gnus-thread-header h1) (gnus-thread-header h2)))
4963
4964 (defun gnus-thread-sort-by-total-score (h1 h2)
4965   "Sort threads by the sum of all scores in the thread.
4966 Unscored articles will be counted as having a score of zero."
4967   (> (gnus-thread-total-score h1) (gnus-thread-total-score h2)))
4968
4969 (defun gnus-thread-total-score (thread)
4970   ;; This function find the total score of THREAD.
4971   (cond
4972    ((null thread)
4973     0)
4974    ((consp thread)
4975     (if (stringp (car thread))
4976         (apply gnus-thread-score-function 0
4977                (mapcar 'gnus-thread-total-score-1 (cdr thread)))
4978       (gnus-thread-total-score-1 thread)))
4979    (t
4980     (gnus-thread-total-score-1 (list thread)))))
4981
4982 (defun gnus-thread-sort-by-most-recent-number (h1 h2)
4983   "Sort threads such that the thread with the most recently arrived article comes first."
4984   (> (gnus-thread-highest-number h1) (gnus-thread-highest-number h2)))
4985
4986 (defun gnus-thread-highest-number (thread)
4987   "Return the highest article number in THREAD."
4988   (apply 'max (mapcar (lambda (header)
4989                         (mail-header-number header))
4990                       (message-flatten-list thread))))
4991
4992 (defun gnus-thread-sort-by-most-recent-date (h1 h2)
4993   "Sort threads such that the thread with the most recently dated article comes first."
4994   (> (gnus-thread-latest-date h1) (gnus-thread-latest-date h2)))
4995
4996 (defun gnus-thread-latest-date (thread)
4997   "Return the highest article date in THREAD."
4998   (let ((previous-time 0))
4999     (apply 'max
5000            (mapcar
5001             (lambda (header)
5002               (setq previous-time
5003                     (condition-case ()
5004                         (gnus-float-time (mail-header-parse-date
5005                                           (mail-header-date header)))
5006                       (error previous-time))))
5007             (sort
5008              (message-flatten-list thread)
5009              (lambda (h1 h2)
5010                (< (mail-header-number h1)
5011                   (mail-header-number h2))))))))
5012
5013 (defun gnus-thread-total-score-1 (root)
5014   ;; This function find the total score of the thread below ROOT.
5015   (setq root (car root))
5016   (apply gnus-thread-score-function
5017          (or (append
5018               (mapcar 'gnus-thread-total-score
5019                       (cdr (gnus-id-to-thread (mail-header-id root))))
5020               (when (> (mail-header-number root) 0)
5021                 (list (or (cdr (assq (mail-header-number root)
5022                                      gnus-newsgroup-scored))
5023                           gnus-summary-default-score 0))))
5024              (list gnus-summary-default-score)
5025              '(0))))
5026
5027 ;; Added by Per Abrahamsen <amanda@iesd.auc.dk>.
5028 (defvar gnus-tmp-prev-subject nil)
5029 (defvar gnus-tmp-false-parent nil)
5030 (defvar gnus-tmp-root-expunged nil)
5031 (defvar gnus-tmp-dummy-line nil)
5032
5033 (defun gnus-extra-header (type &optional header)
5034   "Return the extra header of TYPE."
5035   (or (cdr (assq type (mail-header-extra (or header gnus-tmp-header))))
5036       ""))
5037
5038 (defvar gnus-tmp-thread-tree-header-string "")
5039
5040 (defcustom gnus-sum-thread-tree-root "> "
5041   "With %B spec, used for the root of a thread.
5042 If nil, use subject instead."
5043   :version "22.1"
5044   :type '(radio (const :format "%v  " nil) string)
5045   :group 'gnus-thread)
5046
5047 (defcustom gnus-sum-thread-tree-false-root "> "
5048   "With %B spec, used for a false root of a thread.
5049 If nil, use subject instead."
5050   :version "22.1"
5051   :type '(radio (const :format "%v  " nil) string)
5052   :group 'gnus-thread)
5053
5054 (defcustom gnus-sum-thread-tree-single-indent ""
5055   "With %B spec, used for a thread with just one message.
5056 If nil, use subject instead."
5057   :version "22.1"
5058   :type '(radio (const :format "%v  " nil) string)
5059   :group 'gnus-thread)
5060
5061 (defcustom gnus-sum-thread-tree-vertical "| "
5062   "With %B spec, used for drawing a vertical line."
5063   :version "22.1"
5064   :type 'string
5065   :group 'gnus-thread)
5066
5067 (defcustom gnus-sum-thread-tree-indent "  "
5068   "With %B spec, used for indenting."
5069   :version "22.1"
5070   :type 'string
5071   :group 'gnus-thread)
5072
5073 (defcustom gnus-sum-thread-tree-leaf-with-other "+-> "
5074   "With %B spec, used for a leaf with brothers."
5075   :version "22.1"
5076   :type 'string
5077   :group 'gnus-thread)
5078
5079 (defcustom gnus-sum-thread-tree-single-leaf "\\-> "
5080   "With %B spec, used for a leaf without brothers."
5081   :version "22.1"
5082   :type 'string
5083   :group 'gnus-thread)
5084
5085 (defcustom gnus-summary-display-while-building nil
5086   "If non-nil, show and update the summary buffer as it's being built.
5087 If the value is t, update the buffer after every line is inserted.  If
5088 the value is an integer (N), update the display every N lines."
5089   :version "22.1"
5090   :group 'gnus-thread
5091   :type '(choice (const :tag "off" nil)
5092                  number
5093                  (const :tag "frequently" t)))
5094
5095 (defun gnus-summary-prepare-threads (threads)
5096   "Prepare summary buffer from THREADS and indentation LEVEL.
5097 THREADS is either a list of `(PARENT [(CHILD1 [(GRANDCHILD ...]...) ...])'
5098 or a straight list of headers."
5099   (gnus-message 7 "Generating summary...")
5100
5101   (setq gnus-newsgroup-threads threads)
5102   (beginning-of-line)
5103
5104   (let ((gnus-tmp-level 0)
5105         (default-score (or gnus-summary-default-score 0))
5106         (gnus-visual-p (gnus-visual-p 'summary-highlight 'highlight))
5107         (building-line-count gnus-summary-display-while-building)
5108         (building-count (integerp gnus-summary-display-while-building))
5109         thread number subject stack state gnus-tmp-gathered beg-match
5110         new-roots gnus-tmp-new-adopts thread-end simp-subject
5111         gnus-tmp-header gnus-tmp-unread gnus-tmp-downloaded
5112         gnus-tmp-replied gnus-tmp-subject-or-nil
5113         gnus-tmp-dummy gnus-tmp-indentation gnus-tmp-lines gnus-tmp-score
5114         gnus-tmp-score-char gnus-tmp-from gnus-tmp-name
5115         gnus-tmp-number gnus-tmp-opening-bracket gnus-tmp-closing-bracket
5116         tree-stack)
5117
5118     (setq gnus-tmp-prev-subject nil
5119           gnus-tmp-thread-tree-header-string "")
5120
5121     (if (vectorp (car threads))
5122         ;; If this is a straight (sic) list of headers, then a
5123         ;; threaded summary display isn't required, so we just create
5124         ;; an unthreaded one.
5125         (gnus-summary-prepare-unthreaded threads)
5126
5127       ;; Do the threaded display.
5128
5129       (if gnus-summary-display-while-building
5130           (switch-to-buffer (buffer-name)))
5131       (while (or threads stack gnus-tmp-new-adopts new-roots)
5132
5133         (if (and (= gnus-tmp-level 0)
5134                  (or (not stack)
5135                      (= (caar stack) 0))
5136                  (not gnus-tmp-false-parent)
5137                  (or gnus-tmp-new-adopts new-roots))
5138             (if gnus-tmp-new-adopts
5139                 (setq gnus-tmp-level (if gnus-tmp-root-expunged 0 1)
5140                       thread (list (car gnus-tmp-new-adopts))
5141                       gnus-tmp-header (caar thread)
5142                       gnus-tmp-new-adopts (cdr gnus-tmp-new-adopts))
5143               (when new-roots
5144                 (setq thread (list (car new-roots))
5145                       gnus-tmp-header (caar thread)
5146                       new-roots (cdr new-roots))))
5147
5148           (if threads
5149               ;; If there are some threads, we do them before the
5150               ;; threads on the stack.
5151               (setq thread threads
5152                     gnus-tmp-header (caar thread))
5153             ;; There were no current threads, so we pop something off
5154             ;; the stack.
5155             (setq state (car stack)
5156                   gnus-tmp-level (car state)
5157                   tree-stack (cadr state)
5158                   thread (caddr state)
5159                   stack (cdr stack)
5160                   gnus-tmp-header (caar thread))))
5161
5162         (setq gnus-tmp-false-parent nil)
5163         (setq gnus-tmp-root-expunged nil)
5164         (setq thread-end nil)
5165
5166         (if (stringp gnus-tmp-header)
5167             ;; The header is a dummy root.
5168             (cond
5169              ((eq gnus-summary-make-false-root 'adopt)
5170               ;; We let the first article adopt the rest.
5171               (setq gnus-tmp-new-adopts (nconc gnus-tmp-new-adopts
5172                                                (cddar thread)))
5173               (setq gnus-tmp-gathered
5174                     (nconc (mapcar
5175                             (lambda (h) (mail-header-number (car h)))
5176                             (cddar thread))
5177                            gnus-tmp-gathered))
5178               (setq thread (cons (list (caar thread)
5179                                        (cadar thread))
5180                                  (cdr thread)))
5181               (setq gnus-tmp-level -1
5182                     gnus-tmp-false-parent t))
5183              ((eq gnus-summary-make-false-root 'empty)
5184               ;; We print adopted articles with empty subject fields.
5185               (setq gnus-tmp-gathered
5186                     (nconc (mapcar
5187                             (lambda (h) (mail-header-number (car h)))
5188                             (cddar thread))
5189                            gnus-tmp-gathered))
5190               (setq gnus-tmp-level -1))
5191              ((eq gnus-summary-make-false-root 'dummy)
5192               ;; We remember that we probably want to output a dummy
5193               ;; root.
5194               (setq gnus-tmp-dummy-line gnus-tmp-header)
5195               (setq gnus-tmp-prev-subject gnus-tmp-header))
5196              (t
5197               ;; We do not make a root for the gathered
5198               ;; sub-threads at all.
5199               (setq gnus-tmp-level -1)))
5200
5201           (setq number (mail-header-number gnus-tmp-header)
5202                 subject (mail-header-subject gnus-tmp-header)
5203                 simp-subject (gnus-simplify-subject-fully subject))
5204
5205           (cond
5206            ;; If the thread has changed subject, we might want to make
5207            ;; this subthread into a root.
5208            ((and (null gnus-thread-ignore-subject)
5209                  (not (zerop gnus-tmp-level))
5210                  gnus-tmp-prev-subject
5211                  (not (string= gnus-tmp-prev-subject simp-subject)))
5212             (setq new-roots (nconc new-roots (list (car thread)))
5213                   thread-end t
5214                   gnus-tmp-header nil))
5215            ;; If the article lies outside the current limit,
5216            ;; then we do not display it.
5217            ((not (memq number gnus-newsgroup-limit))
5218             (setq gnus-tmp-gathered
5219                   (nconc (mapcar
5220                           (lambda (h) (mail-header-number (car h)))
5221                           (cdar thread))
5222                          gnus-tmp-gathered))
5223             (setq gnus-tmp-new-adopts (if (cdar thread)
5224                                           (append gnus-tmp-new-adopts
5225                                                   (cdar thread))
5226                                         gnus-tmp-new-adopts)
5227                   thread-end t
5228                   gnus-tmp-header nil)
5229             (when (zerop gnus-tmp-level)
5230               (setq gnus-tmp-root-expunged t)))
5231            ;; Perhaps this article is to be marked as read?
5232            ((and gnus-summary-mark-below
5233                  (< (or (cdr (assq number gnus-newsgroup-scored))
5234                         default-score)
5235                     gnus-summary-mark-below)
5236                  ;; Don't touch sparse articles.
5237                  (not (gnus-summary-article-sparse-p number))
5238                  (not (gnus-summary-article-ancient-p number)))
5239             (setq gnus-newsgroup-unreads
5240                   (delq number gnus-newsgroup-unreads))
5241             (if gnus-newsgroup-auto-expire
5242                 (setq gnus-newsgroup-expirable
5243                       (gnus-add-to-sorted-list
5244                        gnus-newsgroup-expirable number))
5245               (push (cons number gnus-low-score-mark)
5246                     gnus-newsgroup-reads))))
5247
5248           (when gnus-tmp-header
5249             ;; We may have an old dummy line to output before this
5250             ;; article.
5251             (when (and gnus-tmp-dummy-line
5252                        (gnus-subject-equal
5253                         gnus-tmp-dummy-line
5254                         (mail-header-subject gnus-tmp-header)))
5255               (gnus-summary-insert-dummy-line
5256                gnus-tmp-dummy-line (mail-header-number gnus-tmp-header))
5257               (setq gnus-tmp-dummy-line nil))
5258
5259             ;; Compute the mark.
5260             (setq gnus-tmp-unread (gnus-article-mark number))
5261
5262             (push (gnus-data-make number gnus-tmp-unread (1+ (point))
5263                                   gnus-tmp-header gnus-tmp-level)
5264                   gnus-newsgroup-data)
5265
5266             ;; Actually insert the line.
5267             (setq
5268              gnus-tmp-subject-or-nil
5269              (cond
5270               ((and gnus-thread-ignore-subject
5271                     gnus-tmp-prev-subject
5272                     (not (string= gnus-tmp-prev-subject simp-subject)))
5273                subject)
5274               ((zerop gnus-tmp-level)
5275                (if (and (eq gnus-summary-make-false-root 'empty)
5276                         (memq number gnus-tmp-gathered)
5277                         gnus-tmp-prev-subject
5278                         (string= gnus-tmp-prev-subject simp-subject))
5279                    gnus-summary-same-subject
5280                  subject))
5281               (t gnus-summary-same-subject)))
5282             (if (and (eq gnus-summary-make-false-root 'adopt)
5283                      (= gnus-tmp-level 1)
5284                      (memq number gnus-tmp-gathered))
5285                 (setq gnus-tmp-opening-bracket ?\<
5286                       gnus-tmp-closing-bracket ?\>)
5287               (setq gnus-tmp-opening-bracket ?\[
5288                     gnus-tmp-closing-bracket ?\]))
5289             (if (>= gnus-tmp-level (length gnus-thread-indent-array))
5290                 (gnus-make-thread-indent-array
5291                  (max (* 2 (length gnus-thread-indent-array))
5292                       gnus-tmp-level)))
5293             (setq
5294              gnus-tmp-indentation
5295              (aref gnus-thread-indent-array gnus-tmp-level)
5296              gnus-tmp-lines (mail-header-lines gnus-tmp-header)
5297              gnus-tmp-score (or (cdr (assq number gnus-newsgroup-scored))
5298                                 gnus-summary-default-score 0)
5299              gnus-tmp-score-char
5300              (if (or (null gnus-summary-default-score)
5301                      (<= (abs (- gnus-tmp-score gnus-summary-default-score))
5302                          gnus-summary-zcore-fuzz))
5303                  ?                      ;Whitespace
5304                (if (< gnus-tmp-score gnus-summary-default-score)
5305                    gnus-score-below-mark gnus-score-over-mark))
5306              gnus-tmp-replied
5307              (cond ((memq number gnus-newsgroup-processable)
5308                     gnus-process-mark)
5309                    ((memq number gnus-newsgroup-cached)
5310                     gnus-cached-mark)
5311                    ((memq number gnus-newsgroup-replied)
5312                     gnus-replied-mark)
5313                    ((memq number gnus-newsgroup-forwarded)
5314                     gnus-forwarded-mark)
5315                    ((memq number gnus-newsgroup-saved)
5316                     gnus-saved-mark)
5317                    ((memq number gnus-newsgroup-recent)
5318                     gnus-recent-mark)
5319                    ((memq number gnus-newsgroup-unseen)
5320                     gnus-unseen-mark)
5321                    (t gnus-no-mark))
5322              gnus-tmp-downloaded
5323              (cond ((memq number gnus-newsgroup-undownloaded)
5324                     gnus-undownloaded-mark)
5325                    (gnus-newsgroup-agentized
5326                     gnus-downloaded-mark)
5327                    (t
5328                     gnus-no-mark))
5329              gnus-tmp-from (mail-header-from gnus-tmp-header)
5330              gnus-tmp-name
5331              (cond
5332               ((string-match "<[^>]+> *$" gnus-tmp-from)
5333                (setq beg-match (match-beginning 0))
5334                (or (and (string-match "^\".+\"" gnus-tmp-from)
5335                         (substring gnus-tmp-from 1 (1- (match-end 0))))
5336                    (substring gnus-tmp-from 0 beg-match)))
5337               ((string-match "(.+)" gnus-tmp-from)
5338                (substring gnus-tmp-from
5339                           (1+ (match-beginning 0)) (1- (match-end 0))))
5340               (t gnus-tmp-from))
5341
5342              ;; Do the %B string
5343              gnus-tmp-thread-tree-header-string
5344              (cond
5345               ((not gnus-show-threads) "")
5346               ((zerop gnus-tmp-level)
5347                (cond ((cdar thread)
5348                       (or gnus-sum-thread-tree-root subject))
5349                      (gnus-tmp-new-adopts
5350                       (or gnus-sum-thread-tree-false-root subject))
5351                      (t
5352                       (or gnus-sum-thread-tree-single-indent subject))))
5353               (t
5354                (concat (apply 'concat
5355                               (mapcar (lambda (item)
5356                                         (if (= item 1)
5357                                             gnus-sum-thread-tree-vertical
5358                                           gnus-sum-thread-tree-indent))
5359                                       (cdr (reverse tree-stack))))
5360                        (if (nth 1 thread)
5361                            gnus-sum-thread-tree-leaf-with-other
5362                          gnus-sum-thread-tree-single-leaf)))))
5363             (when (string= gnus-tmp-name "")
5364               (setq gnus-tmp-name gnus-tmp-from))
5365             (unless (numberp gnus-tmp-lines)
5366               (setq gnus-tmp-lines -1))
5367             (if (= gnus-tmp-lines -1)
5368                 (setq gnus-tmp-lines "?")
5369               (setq gnus-tmp-lines (number-to-string gnus-tmp-lines)))
5370               (gnus-put-text-property
5371                (point)
5372                (progn (eval gnus-summary-line-format-spec) (point))
5373                'gnus-number number)
5374               (when gnus-visual-p
5375                 (forward-line -1)
5376                 (gnus-run-hooks 'gnus-summary-update-hook)
5377                 (forward-line 1))
5378
5379               (setq gnus-tmp-prev-subject simp-subject)))
5380
5381         (when (nth 1 thread)
5382           (push (list (max 0 gnus-tmp-level)
5383                       (copy-sequence tree-stack)
5384                       (nthcdr 1 thread))
5385                 stack))
5386         (push (if (nth 1 thread) 1 0) tree-stack)
5387         (incf gnus-tmp-level)
5388         (setq threads (if thread-end nil (cdar thread)))
5389         (if gnus-summary-display-while-building
5390             (if building-count
5391                 (progn
5392                   ;; use a set frequency
5393                   (setq building-line-count (1- building-line-count))
5394                   (when (= building-line-count 0)
5395                     (sit-for 0)
5396                     (setq building-line-count
5397                           gnus-summary-display-while-building)))
5398               ;; always
5399               (sit-for 0)))
5400         (unless threads
5401           (setq gnus-tmp-level 0)))))
5402   (gnus-message 7 "Generating summary...done"))
5403
5404 (defun gnus-summary-prepare-unthreaded (headers)
5405   "Generate an unthreaded summary buffer based on HEADERS."
5406   (let (header number mark)
5407
5408     (beginning-of-line)
5409
5410     (while headers
5411       ;; We may have to root out some bad articles...
5412       (when (memq (setq number (mail-header-number
5413                                 (setq header (pop headers))))
5414                   gnus-newsgroup-limit)
5415         ;; Mark article as read when it has a low score.
5416         (when (and gnus-summary-mark-below
5417                    (< (or (cdr (assq number gnus-newsgroup-scored))
5418                           gnus-summary-default-score 0)
5419                       gnus-summary-mark-below)
5420                    (not (gnus-summary-article-ancient-p number)))
5421           (setq gnus-newsgroup-unreads
5422                 (delq number gnus-newsgroup-unreads))
5423           (if gnus-newsgroup-auto-expire
5424               (push number gnus-newsgroup-expirable)
5425             (push (cons number gnus-low-score-mark)
5426                   gnus-newsgroup-reads)))
5427
5428         (setq mark (gnus-article-mark number))
5429         (push (gnus-data-make number mark (1+ (point)) header 0)
5430               gnus-newsgroup-data)
5431         (gnus-summary-insert-line
5432          header 0 number
5433          (memq number gnus-newsgroup-undownloaded)
5434          mark (memq number gnus-newsgroup-replied)
5435          (memq number gnus-newsgroup-expirable)
5436          (mail-header-subject header) nil
5437          (cdr (assq number gnus-newsgroup-scored))
5438          (memq number gnus-newsgroup-processable))))))
5439
5440 (defun gnus-summary-remove-list-identifiers ()
5441   "Remove list identifiers in `gnus-list-identifiers' from articles in the current group."
5442   (let ((regexp (if (consp gnus-list-identifiers)
5443                     (mapconcat 'identity gnus-list-identifiers " *\\|")
5444                   gnus-list-identifiers))
5445         changed subject)
5446     (when regexp
5447       (setq regexp (concat "^\\(?:R[Ee]: +\\)*\\(" regexp " *\\)"))
5448       (dolist (header gnus-newsgroup-headers)
5449         (setq subject (mail-header-subject header)
5450               changed nil)
5451         (while (string-match regexp subject)
5452           (setq subject
5453                 (concat (substring subject 0 (match-beginning 1))
5454                         (substring subject (match-end 0)))
5455                 changed t))
5456         (when changed
5457           (when (string-match "^\\(\\(?:R[Ee]: +\\)+\\)R[Ee]: +" subject)
5458             (setq subject
5459                   (concat (substring subject 0 (match-beginning 1))
5460                           (substring subject (match-end 1)))))
5461           (mail-header-set-subject header subject))))))
5462
5463 (defun gnus-fetch-headers (articles)
5464   "Fetch headers of ARTICLES."
5465   (let ((name (gnus-group-decoded-name gnus-newsgroup-name)))
5466     (gnus-message 5 "Fetching headers for %s..." name)
5467     (prog1
5468         (if (eq 'nov
5469                 (setq gnus-headers-retrieved-by
5470                       (gnus-retrieve-headers
5471                        articles gnus-newsgroup-name
5472                        ;; We might want to fetch old headers, but
5473                        ;; not if there is only 1 article.
5474                        (and (or (and
5475                                  (not (eq gnus-fetch-old-headers 'some))
5476                                  (not (numberp gnus-fetch-old-headers)))
5477                                 (> (length articles) 1))
5478                             gnus-fetch-old-headers))))
5479             (gnus-get-newsgroup-headers-xover
5480              articles nil nil gnus-newsgroup-name t)
5481           (gnus-get-newsgroup-headers))
5482       (gnus-message 5 "Fetching headers for %s...done" name))))
5483
5484 (defun gnus-select-newsgroup (group &optional read-all select-articles)
5485   "Select newsgroup GROUP.
5486 If READ-ALL is non-nil, all articles in the group are selected.
5487 If SELECT-ARTICLES, only select those articles from GROUP."
5488   (let* ((entry (gnus-group-entry group))
5489          ;;!!! Dirty hack; should be removed.
5490          (gnus-summary-ignore-duplicates
5491           (if (eq (car (gnus-find-method-for-group group)) 'nnvirtual)
5492               t
5493             gnus-summary-ignore-duplicates))
5494          (info (nth 2 entry))
5495          charset articles fetched-articles cached)
5496
5497     (unless (gnus-check-server
5498              (set (make-local-variable 'gnus-current-select-method)
5499                   (gnus-find-method-for-group group)))
5500       (error "Couldn't open server"))
5501     (setq charset (gnus-group-name-charset gnus-current-select-method group))
5502
5503     (or (and entry (not (eq (car entry) t))) ; Either it's active...
5504         (gnus-activate-group group)     ; Or we can activate it...
5505         (progn                          ; Or we bug out.
5506           (when (equal major-mode 'gnus-summary-mode)
5507             (gnus-kill-buffer (current-buffer)))
5508           (error
5509            "Couldn't activate group %s: %s"
5510            (mm-decode-coding-string group charset)
5511            (mm-decode-coding-string (gnus-status-message group) charset))))
5512
5513     (unless (gnus-request-group group t)
5514         (when (equal major-mode 'gnus-summary-mode)
5515           (gnus-kill-buffer (current-buffer)))
5516         (error "Couldn't request group %s: %s"
5517                (mm-decode-coding-string group charset)
5518                (mm-decode-coding-string (gnus-status-message group) charset)))
5519
5520     (when gnus-agent
5521       (gnus-agent-possibly-alter-active group (gnus-active group) info)
5522
5523       (setq gnus-summary-use-undownloaded-faces
5524             (gnus-agent-find-parameter
5525              group
5526              'agent-enable-undownloaded-faces)))
5527
5528     (setq gnus-newsgroup-name group
5529           gnus-newsgroup-unselected nil
5530           gnus-newsgroup-unreads (gnus-list-of-unread-articles group))
5531
5532     (let ((display (gnus-group-find-parameter group 'display)))
5533       (setq gnus-newsgroup-display
5534             (cond
5535              ((not (zerop (or (car-safe read-all) 0)))
5536               ;; The user entered the group with C-u SPC/RET, let's show
5537               ;; all articles.
5538               'gnus-not-ignore)
5539              ((eq display 'all)
5540               'gnus-not-ignore)
5541              ((arrayp display)
5542               (gnus-summary-display-make-predicate (mapcar 'identity display)))
5543              ((numberp display)
5544               ;; The following is probably the "correct" solution, but
5545               ;; it makes Gnus fetch all headers and then limit the
5546               ;; articles (which is slow), so instead we hack the
5547               ;; select-articles parameter instead. -- Simon Josefsson
5548               ;; <jas@kth.se>
5549               ;;
5550               ;; (gnus-byte-compile
5551               ;;  `(lambda () (> number ,(- (cdr (gnus-active group))
5552               ;;                         display)))))
5553               (setq select-articles
5554                     (gnus-uncompress-range
5555                      (cons (let ((tmp (- (cdr (gnus-active group)) display)))
5556                              (if (> tmp 0)
5557                                  tmp
5558                                1))
5559                            (cdr (gnus-active group)))))
5560               nil)
5561              (t
5562               nil))))
5563
5564     (gnus-summary-setup-default-charset)
5565
5566     ;; Kludge to avoid having cached articles nixed out in virtual groups.
5567     (when (gnus-virtual-group-p group)
5568       (setq cached gnus-newsgroup-cached))
5569
5570     (setq gnus-newsgroup-unreads
5571           (gnus-sorted-ndifference
5572            (gnus-sorted-ndifference gnus-newsgroup-unreads
5573                                     gnus-newsgroup-marked)
5574            gnus-newsgroup-dormant))
5575
5576     (setq gnus-newsgroup-processable nil)
5577
5578     (gnus-update-read-articles group gnus-newsgroup-unreads)
5579
5580     ;; Adjust and set lists of article marks.
5581     (when info
5582       (gnus-adjust-marked-articles info))
5583     (if (setq articles select-articles)
5584         (setq gnus-newsgroup-unselected
5585               (gnus-sorted-difference gnus-newsgroup-unreads articles))
5586       (setq articles (gnus-articles-to-read group read-all)))
5587
5588     (cond
5589      ((null articles)
5590       ;;(gnus-message 3 "Couldn't select newsgroup -- no articles to display")
5591       'quit)
5592      ((eq articles 0) nil)
5593      (t
5594       ;; Init the dependencies hash table.
5595       (setq gnus-newsgroup-dependencies
5596             (gnus-make-hashtable (length articles)))
5597       (gnus-set-global-variables)
5598       ;; Retrieve the headers and read them in.
5599
5600       (setq gnus-newsgroup-headers (gnus-fetch-headers articles))
5601
5602       ;; Kludge to avoid having cached articles nixed out in virtual groups.
5603       (when cached
5604         (setq gnus-newsgroup-cached cached))
5605
5606       ;; Suppress duplicates?
5607       (when gnus-suppress-duplicates
5608         (gnus-dup-suppress-articles))
5609
5610       ;; Set the initial limit.
5611       (setq gnus-newsgroup-limit (copy-sequence articles))
5612       ;; Remove canceled articles from the list of unread articles.
5613       (setq fetched-articles
5614             (mapcar (lambda (headers) (mail-header-number headers))
5615                     gnus-newsgroup-headers))
5616       (setq gnus-newsgroup-articles fetched-articles)
5617       (setq gnus-newsgroup-unreads
5618             (gnus-sorted-nintersection
5619              gnus-newsgroup-unreads fetched-articles))
5620       (gnus-compute-unseen-list)
5621
5622       ;; Removed marked articles that do not exist.
5623       (gnus-update-missing-marks
5624        (gnus-sorted-difference articles fetched-articles))
5625       ;; We might want to build some more threads first.
5626       (when (and gnus-fetch-old-headers
5627                  (eq gnus-headers-retrieved-by 'nov))
5628         (if (eq gnus-fetch-old-headers 'invisible)
5629             (gnus-build-all-threads)
5630           (gnus-build-old-threads)))
5631       ;; Let the Gnus agent mark articles as read.
5632       (when gnus-agent
5633         (gnus-agent-get-undownloaded-list))
5634       ;; Remove list identifiers from subject
5635       (when gnus-list-identifiers
5636         (gnus-summary-remove-list-identifiers))
5637       ;; Check whether auto-expire is to be done in this group.
5638       (setq gnus-newsgroup-auto-expire
5639             (gnus-group-auto-expirable-p group))
5640       ;; Set up the article buffer now, if necessary.
5641       (unless (and gnus-single-article-buffer
5642                    (equal gnus-article-buffer "*Article*"))
5643         (gnus-article-setup-buffer))
5644       ;; First and last article in this newsgroup.
5645       (when gnus-newsgroup-headers
5646         (setq gnus-newsgroup-begin
5647               (mail-header-number (car gnus-newsgroup-headers))
5648               gnus-newsgroup-end
5649               (mail-header-number
5650                (gnus-last-element gnus-newsgroup-headers))))
5651       ;; GROUP is successfully selected.
5652       (or gnus-newsgroup-headers t)))))
5653
5654 (defun gnus-compute-unseen-list ()
5655   ;; The `seen' marks are treated specially.
5656   (if (not gnus-newsgroup-seen)
5657       (setq gnus-newsgroup-unseen gnus-newsgroup-articles)
5658     (setq gnus-newsgroup-unseen
5659           (gnus-inverse-list-range-intersection
5660            gnus-newsgroup-articles gnus-newsgroup-seen))))
5661
5662 (declare-function gnus-get-predicate "gnus-agent" (predicate))
5663
5664 (defun gnus-summary-display-make-predicate (display)
5665   (require 'gnus-agent)
5666   (when (= (length display) 1)
5667     (setq display (car display)))
5668   (unless gnus-summary-display-cache
5669     (dolist (elem (append '((unread . unread)
5670                             (read . read)
5671                             (unseen . unseen))
5672                           gnus-article-mark-lists))
5673       (push (cons (cdr elem)
5674                   (gnus-byte-compile
5675                    `(lambda () (gnus-article-marked-p ',(cdr elem)))))
5676             gnus-summary-display-cache)))
5677   (let ((gnus-category-predicate-alist gnus-summary-display-cache)
5678         (gnus-category-predicate-cache gnus-summary-display-cache))
5679     (gnus-get-predicate display)))
5680
5681 ;; Uses the dynamically bound `number' variable.
5682 (defvar number)
5683 (defun gnus-article-marked-p (type &optional article)
5684   (let ((article (or article number)))
5685     (cond
5686      ((eq type 'tick)
5687       (memq article gnus-newsgroup-marked))
5688      ((eq type 'spam)
5689       (memq article gnus-newsgroup-spam-marked))
5690      ((eq type 'unsend)
5691       (memq article gnus-newsgroup-unsendable))
5692      ((eq type 'undownload)
5693       (memq article gnus-newsgroup-undownloaded))
5694      ((eq type 'download)
5695       (memq article gnus-newsgroup-downloadable))
5696      ((eq type 'unread)
5697       (memq article gnus-newsgroup-unreads))
5698      ((eq type 'read)
5699       (memq article gnus-newsgroup-reads))
5700      ((eq type 'dormant)
5701       (memq article gnus-newsgroup-dormant) )
5702      ((eq type 'expire)
5703       (memq article gnus-newsgroup-expirable))
5704      ((eq type 'reply)
5705       (memq article gnus-newsgroup-replied))
5706      ((eq type 'killed)
5707       (memq article gnus-newsgroup-killed))
5708      ((eq type 'bookmark)
5709       (assq article gnus-newsgroup-bookmarks))
5710      ((eq type 'score)
5711       (assq article gnus-newsgroup-scored))
5712      ((eq type 'save)
5713       (memq article gnus-newsgroup-saved))
5714      ((eq type 'cache)
5715       (memq article gnus-newsgroup-cached))
5716      ((eq type 'forward)
5717       (memq article gnus-newsgroup-forwarded))
5718      ((eq type 'seen)
5719       (not (memq article gnus-newsgroup-unseen)))
5720      ((eq type 'recent)
5721       (memq article gnus-newsgroup-recent))
5722      (t t))))
5723
5724 (defun gnus-articles-to-read (group &optional read-all)
5725   "Find out what articles the user wants to read."
5726   (let* ((articles
5727           ;; Select all articles if `read-all' is non-nil, or if there
5728           ;; are no unread articles.
5729           (if (or read-all
5730                   (and (zerop (length gnus-newsgroup-marked))
5731                        (zerop (length gnus-newsgroup-unreads)))
5732                   ;; Fetch all if the predicate is non-nil.
5733                   gnus-newsgroup-display)
5734               ;; We want to select the headers for all the articles in
5735               ;; the group, so we select either all the active
5736               ;; articles in the group, or (if that's nil), the
5737               ;; articles in the cache.
5738               (or
5739                (if gnus-newsgroup-maximum-articles
5740                    (let ((active (gnus-active group)))
5741                      (gnus-uncompress-range
5742                       (cons (max (car active)
5743                                  (- (cdr active)
5744                                     gnus-newsgroup-maximum-articles
5745                                     -1))
5746                             (cdr active))))
5747                  (gnus-uncompress-range (gnus-active group)))
5748                (gnus-cache-articles-in-group group))
5749             ;; Select only the "normal" subset of articles.
5750             (gnus-sorted-nunion
5751              (gnus-sorted-union gnus-newsgroup-dormant gnus-newsgroup-marked)
5752              gnus-newsgroup-unreads)))
5753          (scored-list (gnus-killed-articles gnus-newsgroup-killed articles))
5754          (scored (length scored-list))
5755          (number (length articles))
5756          (marked (+ (length gnus-newsgroup-marked)
5757                     (length gnus-newsgroup-dormant)))
5758          (select
5759           (cond
5760            ((numberp read-all)
5761             read-all)
5762            ((numberp gnus-newsgroup-display)
5763             gnus-newsgroup-display)
5764            (t
5765             (condition-case ()
5766                 (cond
5767                  ((and (or (<= scored marked) (= scored number))
5768                        (numberp gnus-large-newsgroup)
5769                        (> number gnus-large-newsgroup))
5770                   (let* ((cursor-in-echo-area nil)
5771                          (initial (gnus-parameter-large-newsgroup-initial
5772                                    gnus-newsgroup-name))
5773                          (input
5774                           (read-string
5775                            (format
5776                             "How many articles from %s (%s %d): "
5777                             (gnus-group-decoded-name gnus-newsgroup-name)
5778                             (if initial "max" "default")
5779                             number)
5780                            (if initial
5781                                (cons (number-to-string initial)
5782                                      0)))))
5783                     (if (string-match "^[ \t]*$" input) number input)))
5784                  ((and (> scored marked) (< scored number)
5785                        (> (- scored number) 20))
5786                   (let ((input
5787                          (read-string
5788                           (format "%s %s (%d scored, %d total): "
5789                                   "How many articles from"
5790                                   (gnus-group-decoded-name group)
5791                                   scored number))))
5792                     (if (string-match "^[ \t]*$" input)
5793                         number input)))
5794                  (t number))
5795               (quit
5796                (message "Quit getting the articles to read")
5797                nil))))))
5798     (setq select (if (stringp select) (string-to-number select) select))
5799     (if (or (null select) (zerop select))
5800         select
5801       (if (and (not (zerop scored)) (<= (abs select) scored))
5802           (progn
5803             (setq articles (sort scored-list '<))
5804             (setq number (length articles)))
5805         (setq articles (copy-sequence articles)))
5806
5807       (when (< (abs select) number)
5808         (if (< select 0)
5809             ;; Select the N oldest articles.
5810             (setcdr (nthcdr (1- (abs select)) articles) nil)
5811           ;; Select the N most recent articles.
5812           (setq articles (nthcdr (- number select) articles))))
5813       (setq gnus-newsgroup-unselected
5814             (gnus-sorted-difference gnus-newsgroup-unreads articles))
5815       (when gnus-alter-articles-to-read-function
5816         (setq articles
5817               (sort
5818                (funcall gnus-alter-articles-to-read-function
5819                         gnus-newsgroup-name articles)
5820                '<)))
5821       articles)))
5822
5823 (defun gnus-killed-articles (killed articles)
5824   (let (out)
5825     (while articles
5826       (when (inline (gnus-member-of-range (car articles) killed))
5827         (push (car articles) out))
5828       (setq articles (cdr articles)))
5829     out))
5830
5831 (defun gnus-uncompress-marks (marks)
5832   "Uncompress the mark ranges in MARKS."
5833   (let ((uncompressed '(score bookmark))
5834         out)
5835     (while marks
5836       (if (memq (caar marks) uncompressed)
5837           (push (car marks) out)
5838         (push (cons (caar marks) (gnus-uncompress-range (cdar marks))) out))
5839       (setq marks (cdr marks)))
5840     out))
5841
5842 (defun gnus-article-mark-to-type (mark)
5843   "Return the type of MARK."
5844   (or (cadr (assq mark gnus-article-special-mark-lists))
5845       'list))
5846
5847 (defun gnus-article-unpropagatable-p (mark)
5848   "Return whether MARK should be propagated to back end."
5849   (memq mark gnus-article-unpropagated-mark-lists))
5850
5851 (defun gnus-adjust-marked-articles (info)
5852   "Set all article lists and remove all marks that are no longer valid."
5853   (let* ((marked-lists (gnus-info-marks info))
5854          (active (gnus-active (gnus-info-group info)))
5855          (min (car active))
5856          (max (cdr active))
5857          (types gnus-article-mark-lists)
5858          marks var articles article mark mark-type
5859          bgn end)
5860
5861     (dolist (marks marked-lists)
5862       (setq mark (car marks)
5863             mark-type (gnus-article-mark-to-type mark)
5864             var (intern (format "gnus-newsgroup-%s" (car (rassq mark types)))))
5865
5866       ;; We set the variable according to the type of the marks list,
5867       ;; and then adjust the marks to a subset of the active articles.
5868       (cond
5869        ;; Adjust "simple" lists - compressed yet unsorted
5870        ((eq mark-type 'list)
5871         ;; Simultaneously uncompress and clip to active range
5872         ;; See gnus-uncompress-range for a description of possible marks
5873         (let (l lh)
5874           (if (not (cadr marks))
5875               (set var nil)
5876             (setq articles (if (numberp (cddr marks))
5877                                (list (cdr marks))
5878                              (cdr marks))
5879                   lh (cons nil nil)
5880                   l lh)
5881
5882             (while (setq article (pop articles))
5883               (cond ((consp article)
5884                      (setq bgn (max (car article) min)
5885                            end (min (cdr article) max))
5886                      (while (<= bgn end)
5887                        (setq l (setcdr l (cons bgn nil))
5888                              bgn (1+ bgn))))
5889                     ((and (<= min article)
5890                           (>= max article))
5891                      (setq l (setcdr l (cons article nil))))))
5892             (set var (cdr lh)))))
5893        ;; Adjust assocs.
5894        ((eq mark-type 'tuple)
5895         (set var (setq articles (cdr marks)))
5896         (when (not (listp (cdr (symbol-value var))))
5897           (set var (list (symbol-value var))))
5898         (when (not (listp (cdr articles)))
5899           (setq articles (list articles)))
5900         (while articles
5901           (when (or (not (consp (setq article (pop articles))))
5902                     (< (car article) min)
5903                     (> (car article) max))
5904             (set var (delq article (symbol-value var))))))
5905        ;; Adjust ranges (sloppily).
5906        ((eq mark-type 'range)
5907         (cond
5908          ((eq mark 'seen)
5909           ;; Fix the record for `seen' if it looks like (seen NUM1 . NUM2).
5910           ;; It should be (seen (NUM1 . NUM2)).
5911           (when (numberp (cddr marks))
5912             (setcdr marks (list (cdr marks))))
5913           (setq articles (cdr marks))
5914           (while (and articles
5915                       (or (and (consp (car articles))
5916                                (> min (cdar articles)))
5917                           (and (numberp (car articles))
5918                                (> min (car articles)))))
5919             (pop articles))
5920           (set var articles))))))))
5921
5922 (defun gnus-update-missing-marks (missing)
5923   "Go through the list of MISSING articles and remove them from the mark lists."
5924   (when missing
5925     (let (var m)
5926       ;; Go through all types.
5927       (dolist (elem gnus-article-mark-lists)
5928         (when (eq (gnus-article-mark-to-type (cdr elem)) 'list)
5929           (setq var (intern (format "gnus-newsgroup-%s" (car elem))))
5930           (when (symbol-value var)
5931             ;; This list has articles.  So we delete all missing
5932             ;; articles from it.
5933             (setq m missing)
5934             (while m
5935               (set var (delq (pop m) (symbol-value var))))))))))
5936
5937 (defun gnus-update-marks ()
5938   "Enter the various lists of marked articles into the newsgroup info list."
5939   (let ((types gnus-article-mark-lists)
5940         (info (gnus-get-info gnus-newsgroup-name))
5941         type list newmarked symbol delta-marks)
5942     (when info
5943       ;; Add all marks lists to the list of marks lists.
5944       (while (setq type (pop types))
5945         (setq list (symbol-value
5946                     (setq symbol
5947                           (intern (format "gnus-newsgroup-%s" (car type))))))
5948
5949         (when list
5950           ;; Get rid of the entries of the articles that have the
5951           ;; default score.
5952           (when (and (eq (cdr type) 'score)
5953                      gnus-save-score
5954                      list)
5955             (let* ((arts list)
5956                    (prev (cons nil list))
5957                    (all prev))
5958               (while arts
5959                 (if (or (not (consp (car arts)))
5960                         (= (cdar arts) gnus-summary-default-score))
5961                     (setcdr prev (cdr arts))
5962                   (setq prev arts))
5963                 (setq arts (cdr arts)))
5964               (setq list (cdr all)))))
5965
5966         (when (eq (cdr type) 'seen)
5967           (setq list (gnus-range-add list gnus-newsgroup-unseen)))
5968
5969         (when (eq (gnus-article-mark-to-type (cdr type)) 'list)
5970           (setq list (gnus-compress-sequence (set symbol (sort list '<)) t)))
5971
5972         (when (and (gnus-check-backend-function
5973                     'request-set-mark gnus-newsgroup-name)
5974                    (not (gnus-article-unpropagatable-p (cdr type))))
5975           (let* ((old (cdr (assq (cdr type) (gnus-info-marks info))))
5976                  (del (gnus-remove-from-range (gnus-copy-sequence old) list))
5977                  (add (gnus-remove-from-range
5978                        (gnus-copy-sequence list) old)))
5979             (when add
5980               (push (list add 'add (list (cdr type))) delta-marks))
5981             (when del
5982               (push (list del 'del (list (cdr type))) delta-marks))))
5983
5984         (when list
5985           (push (cons (cdr type) list) newmarked)))
5986
5987       (when delta-marks
5988         (unless (gnus-check-group gnus-newsgroup-name)
5989           (error "Can't open server for %s" gnus-newsgroup-name))
5990         (gnus-request-set-mark gnus-newsgroup-name delta-marks))
5991
5992       ;; Enter these new marks into the info of the group.
5993       (if (nthcdr 3 info)
5994           (setcar (nthcdr 3 info) newmarked)
5995         ;; Add the marks lists to the end of the info.
5996         (when newmarked
5997           (setcdr (nthcdr 2 info) (list newmarked))))
5998
5999       ;; Cut off the end of the info if there's nothing else there.
6000       (let ((i 5))
6001         (while (and (> i 2)
6002                     (not (nth i info)))
6003           (when (nthcdr (decf i) info)
6004             (setcdr (nthcdr i info) nil)))))))
6005
6006 (defun gnus-set-mode-line (where)
6007   "Set the mode line of the article or summary buffers.
6008 If WHERE is `summary', the summary mode line format will be used."
6009   ;; Is this mode line one we keep updated?
6010   (when (and (memq where gnus-updated-mode-lines)
6011              (symbol-value
6012               (intern (format "gnus-%s-mode-line-format-spec" where))))
6013     (let (mode-string)
6014       ;; We evaluate this in the summary buffer since these
6015       ;; variables are buffer-local to that buffer.
6016       (with-current-buffer gnus-summary-buffer
6017         ;; We bind all these variables that are used in the `eval' form
6018         ;; below.
6019         (let* ((mformat (symbol-value
6020                          (intern
6021                           (format "gnus-%s-mode-line-format-spec" where))))
6022                (gnus-tmp-group-name (gnus-mode-string-quote
6023                                      (gnus-group-decoded-name
6024                                       gnus-newsgroup-name)))
6025                (gnus-tmp-article-number (or gnus-current-article 0))
6026                (gnus-tmp-unread gnus-newsgroup-unreads)
6027                (gnus-tmp-unread-and-unticked (length gnus-newsgroup-unreads))
6028                (gnus-tmp-unselected (length gnus-newsgroup-unselected))
6029                (gnus-tmp-unread-and-unselected
6030                 (cond ((and (zerop gnus-tmp-unread-and-unticked)
6031                             (zerop gnus-tmp-unselected))
6032                        "")
6033                       ((zerop gnus-tmp-unselected)
6034                        (format "{%d more}" gnus-tmp-unread-and-unticked))
6035                       (t (format "{%d(+%d) more}"
6036                                  gnus-tmp-unread-and-unticked
6037                                  gnus-tmp-unselected))))
6038                (gnus-tmp-subject
6039                 (if (and gnus-current-headers
6040                          (vectorp gnus-current-headers))
6041                     (gnus-mode-string-quote
6042                      (mail-header-subject gnus-current-headers))
6043                   ""))
6044                bufname-length max-len
6045                gnus-tmp-header) ;; passed as argument to any user-format-funcs
6046           (setq mode-string (eval mformat))
6047           (setq bufname-length (if (string-match "%b" mode-string)
6048                                    (- (length
6049                                        (buffer-name
6050                                         (if (eq where 'summary)
6051                                             nil
6052                                           (get-buffer gnus-article-buffer))))
6053                                       2)
6054                                  0))
6055           (setq max-len (max 4 (if gnus-mode-non-string-length
6056                                    (- (window-width)
6057                                       gnus-mode-non-string-length
6058                                       bufname-length)
6059                                  (length mode-string))))
6060           ;; We might have to chop a bit of the string off...
6061           (when (> (length mode-string) max-len)
6062             (setq mode-string
6063                   (concat (truncate-string-to-width mode-string (- max-len 3))
6064                           "...")))
6065           ;; Pad the mode string a bit.
6066           (setq mode-string (format (format "%%-%ds" max-len) mode-string))))
6067       ;; Update the mode line.
6068       (setq mode-line-buffer-identification
6069             (gnus-mode-line-buffer-identification (list mode-string)))
6070       (set-buffer-modified-p t))))
6071
6072 (defun gnus-create-xref-hashtb (from-newsgroup headers unreads)
6073   "Go through the HEADERS list and add all Xrefs to a hash table.
6074 The resulting hash table is returned, or nil if no Xrefs were found."
6075   (let* ((virtual (gnus-virtual-group-p from-newsgroup))
6076          (prefix (if virtual "" (gnus-group-real-prefix from-newsgroup)))
6077          (xref-hashtb (gnus-make-hashtable))
6078          start group entry number xrefs header)
6079     (while headers
6080       (setq header (pop headers))
6081       (when (and (setq xrefs (mail-header-xref header))
6082                  (not (memq (setq number (mail-header-number header))
6083                             unreads)))
6084         (setq start 0)
6085         (while (string-match "\\([^ ]+\\)[:/]\\([0-9]+\\)" xrefs start)
6086           (setq start (match-end 0))
6087           (setq group (if prefix
6088                           (concat prefix (substring xrefs (match-beginning 1)
6089                                                     (match-end 1)))
6090                         (substring xrefs (match-beginning 1) (match-end 1))))
6091           (setq number
6092                 (string-to-number (substring xrefs (match-beginning 2)
6093                                           (match-end 2))))
6094           (if (setq entry (gnus-gethash group xref-hashtb))
6095               (setcdr entry (cons number (cdr entry)))
6096             (gnus-sethash group (cons number nil) xref-hashtb)))))
6097     (and start xref-hashtb)))
6098
6099 (defun gnus-mark-xrefs-as-read (from-newsgroup headers unreads)
6100   "Look through all the headers and mark the Xrefs as read."
6101   (let ((virtual (gnus-virtual-group-p from-newsgroup))
6102         name info xref-hashtb idlist method nth4)
6103     (save-excursion
6104       (set-buffer gnus-group-buffer)
6105       (when (setq xref-hashtb
6106                   (gnus-create-xref-hashtb from-newsgroup headers unreads))
6107         (mapatoms
6108          (lambda (group)
6109            (unless (string= from-newsgroup (setq name (symbol-name group)))
6110              (setq idlist (symbol-value group))
6111              ;; Dead groups are not updated.
6112              (and (prog1
6113                       (setq info (gnus-get-info name))
6114                     (when (stringp (setq nth4 (gnus-info-method info)))
6115                       (setq nth4 (gnus-server-to-method nth4))))
6116                   ;; Only do the xrefs if the group has the same
6117                   ;; select method as the group we have just read.
6118                   (or (gnus-methods-equal-p
6119                        nth4 (gnus-find-method-for-group from-newsgroup))
6120                       virtual
6121                       (equal nth4 (setq method (gnus-find-method-for-group
6122                                                 from-newsgroup)))
6123                       (and (equal (car nth4) (car method))
6124                            (equal (nth 1 nth4) (nth 1 method))))
6125                   gnus-use-cross-reference
6126                   (or (not (eq gnus-use-cross-reference t))
6127                       virtual
6128                       ;; Only do cross-references on subscribed
6129                       ;; groups, if that is what is wanted.
6130                       (<= (gnus-info-level info) gnus-level-subscribed))
6131                   (gnus-group-make-articles-read name idlist))))
6132          xref-hashtb)))))
6133
6134 (defun gnus-compute-read-articles (group articles)
6135   (let* ((entry (gnus-group-entry group))
6136          (info (nth 2 entry))
6137          (active (gnus-active group))
6138          ninfo)
6139     (when entry
6140       ;; First peel off all invalid article numbers.
6141       (when active
6142         (let ((ids articles)
6143               id first)
6144           (while (setq id (pop ids))
6145             (when (and first (> id (cdr active)))
6146               ;; We'll end up in this situation in one particular
6147               ;; obscure situation.  If you re-scan a group and get
6148               ;; a new article that is cross-posted to a different
6149               ;; group that has not been re-scanned, you might get
6150               ;; crossposted article that has a higher number than
6151               ;; Gnus believes possible.  So we re-activate this
6152               ;; group as well.  This might mean doing the
6153               ;; crossposting thingy will *increase* the number
6154               ;; of articles in some groups.  Tsk, tsk.
6155               (setq active (or (gnus-activate-group group) active)))
6156             (when (or (> id (cdr active))
6157                       (< id (car active)))
6158               (setq articles (delq id articles))))))
6159       ;; If the read list is nil, we init it.
6160       (if (and active
6161                (null (gnus-info-read info))
6162                (> (car active) 1))
6163           (setq ninfo (cons 1 (1- (car active))))
6164         (setq ninfo (gnus-info-read info)))
6165       ;; Then we add the read articles to the range.
6166       (gnus-add-to-range
6167        ninfo (setq articles (sort articles '<))))))
6168
6169 (defun gnus-group-make-articles-read (group articles)
6170   "Update the info of GROUP to say that ARTICLES are read."
6171   (let* ((num 0)
6172          (entry (gnus-group-entry group))
6173          (info (nth 2 entry))
6174          (active (gnus-active group))
6175          range)
6176     (when entry
6177       (setq range (gnus-compute-read-articles group articles))
6178       (with-current-buffer gnus-group-buffer
6179         (gnus-undo-register
6180           `(progn
6181              (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
6182              (gnus-info-set-read ',info ',(gnus-info-read info))
6183              (gnus-get-unread-articles-in-group ',info (gnus-active ,group))
6184              (gnus-request-set-mark ,group (list (list ',range 'del '(read))))
6185              (gnus-group-update-group ,group t))))
6186       ;; Add the read articles to the range.
6187       (gnus-info-set-read info range)
6188       (gnus-request-set-mark group (list (list range 'add '(read))))
6189       ;; Then we have to re-compute how many unread
6190       ;; articles there are in this group.
6191       (when active
6192         (cond
6193          ((not range)
6194           (setq num (- (1+ (cdr active)) (car active))))
6195          ((not (listp (cdr range)))
6196           (setq num (- (cdr active) (- (1+ (cdr range))
6197                                        (car range)))))
6198          (t
6199           (while range
6200             (if (numberp (car range))
6201                 (setq num (1+ num))
6202               (setq num (+ num (- (1+ (cdar range)) (caar range)))))
6203             (setq range (cdr range)))
6204           (setq num (- (cdr active) num))))
6205         ;; Update the number of unread articles.
6206         (setcar entry num)
6207         ;; Update the group buffer.
6208         (unless (gnus-ephemeral-group-p group)
6209           (gnus-group-update-group group t))))))
6210
6211 (defvar gnus-newsgroup-none-id 0)
6212
6213 (defun gnus-get-newsgroup-headers (&optional dependencies force-new)
6214   (let ((cur nntp-server-buffer)
6215         (dependencies
6216          (or dependencies
6217              (with-current-buffer gnus-summary-buffer
6218                gnus-newsgroup-dependencies)))
6219         headers id end ref number
6220         (mail-parse-charset gnus-newsgroup-charset)
6221         (mail-parse-ignored-charsets
6222          (save-current-buffer (condition-case nil
6223                                   (set-buffer gnus-summary-buffer)
6224                                 (error))
6225                               gnus-newsgroup-ignored-charsets)))
6226     (with-current-buffer nntp-server-buffer
6227       ;; Translate all TAB characters into SPACE characters.
6228       (subst-char-in-region (point-min) (point-max) ?\t ?  t)
6229       (subst-char-in-region (point-min) (point-max) ?\r ?  t)
6230       (ietf-drums-unfold-fws)
6231       (gnus-run-hooks 'gnus-parse-headers-hook)
6232       (let ((case-fold-search t)
6233             in-reply-to header p lines chars)
6234         (goto-char (point-min))
6235         ;; Search to the beginning of the next header.  Error messages
6236         ;; do not begin with 2 or 3.
6237         (while (re-search-forward "^[23][0-9]+ " nil t)
6238           (setq id nil
6239                 ref nil)
6240           ;; This implementation of this function, with nine
6241           ;; search-forwards instead of the one re-search-forward and
6242           ;; a case (which basically was the old function) is actually
6243           ;; about twice as fast, even though it looks messier.  You
6244           ;; can't have everything, I guess.  Speed and elegance
6245           ;; doesn't always go hand in hand.
6246           (setq
6247            header
6248            (vector
6249             ;; Number.
6250             (prog1
6251                 (setq number (read cur))
6252               (end-of-line)
6253               (setq p (point))
6254               (narrow-to-region (point)
6255                                 (or (and (search-forward "\n.\n" nil t)
6256                                          (- (point) 2))
6257                                     (point))))
6258             ;; Subject.
6259             (progn
6260               (goto-char p)
6261               (if (search-forward "\nsubject:" nil t)
6262                   (funcall gnus-decode-encoded-word-function
6263                            (nnheader-header-value))
6264                 "(none)"))
6265             ;; From.
6266             (progn
6267               (goto-char p)
6268               (if (search-forward "\nfrom:" nil t)
6269                   (funcall gnus-decode-encoded-address-function
6270                            (nnheader-header-value))
6271                 "(nobody)"))
6272             ;; Date.
6273             (progn
6274               (goto-char p)
6275               (if (search-forward "\ndate:" nil t)
6276                   (nnheader-header-value) ""))
6277             ;; Message-ID.
6278             (progn
6279               (goto-char p)
6280               (setq id (if (re-search-forward
6281                             "^message-id: *\\(<[^\n\t> ]+>\\)" nil t)
6282                            ;; We do it this way to make sure the Message-ID
6283                            ;; is (somewhat) syntactically valid.
6284                            (buffer-substring (match-beginning 1)
6285                                              (match-end 1))
6286                          ;; If there was no message-id, we just fake one
6287                          ;; to make subsequent routines simpler.
6288                          (nnheader-generate-fake-message-id number))))
6289             ;; References.
6290             (progn
6291               (goto-char p)
6292               (if (search-forward "\nreferences:" nil t)
6293                   (progn
6294                     (setq end (point))
6295                     (prog1
6296                         (nnheader-header-value)
6297                       (setq ref
6298                             (buffer-substring
6299                              (progn
6300                                (end-of-line)
6301                                (search-backward ">" end t)
6302                                (1+ (point)))
6303                              (progn
6304                                (search-backward "<" end t)
6305                                (point))))))
6306                 ;; Get the references from the in-reply-to header if there
6307                 ;; were no references and the in-reply-to header looks
6308                 ;; promising.
6309                 (if (and (search-forward "\nin-reply-to:" nil t)
6310                          (setq in-reply-to (nnheader-header-value))
6311                          (string-match "<[^>]+>" in-reply-to))
6312                     (let (ref2)
6313                       (setq ref (substring in-reply-to (match-beginning 0)
6314                                            (match-end 0)))
6315                       (while (string-match "<[^>]+>" in-reply-to (match-end 0))
6316                         (setq ref2 (substring in-reply-to (match-beginning 0)
6317                                               (match-end 0)))
6318                         (when (> (length ref2) (length ref))
6319                           (setq ref ref2)))
6320                       ref)
6321                   (setq ref nil))))
6322             ;; Chars.
6323             (progn
6324               (goto-char p)
6325               (if (search-forward "\nchars: " nil t)
6326                   (if (numberp (setq chars (ignore-errors (read cur))))
6327                       chars -1)
6328                 -1))
6329             ;; Lines.
6330             (progn
6331               (goto-char p)
6332               (if (search-forward "\nlines: " nil t)
6333                   (if (numberp (setq lines (ignore-errors (read cur))))
6334                       lines -1)
6335                 -1))
6336             ;; Xref.
6337             (progn
6338               (goto-char p)
6339               (and (search-forward "\nxref:" nil t)
6340                    (nnheader-header-value)))
6341             ;; Extra.
6342             (when gnus-extra-headers
6343               (let ((extra gnus-extra-headers)
6344                     out)
6345                 (while extra
6346                   (goto-char p)
6347                   (when (search-forward
6348                          (concat "\n" (symbol-name (car extra)) ":") nil t)
6349                     (push (cons (car extra) (nnheader-header-value))
6350                           out))
6351                   (pop extra))
6352                 out))))
6353           (when (equal id ref)
6354             (setq ref nil))
6355
6356           (when gnus-alter-header-function
6357             (funcall gnus-alter-header-function header)
6358             (setq id (mail-header-id header)
6359                   ref (gnus-parent-id (mail-header-references header))))
6360
6361           (when (setq header
6362                       (gnus-dependencies-add-header
6363                        header dependencies force-new))
6364             (push header headers))
6365           (goto-char (point-max))
6366           (widen))
6367         (nreverse headers)))))
6368
6369 ;; Goes through the xover lines and returns a list of vectors
6370 (defun gnus-get-newsgroup-headers-xover (sequence &optional
6371                                                   force-new dependencies
6372                                                   group also-fetch-heads)
6373   "Parse the news overview data in the server buffer.
6374 Return a list of headers that match SEQUENCE (see
6375 `nntp-retrieve-headers')."
6376   ;; Get the Xref when the users reads the articles since most/some
6377   ;; NNTP servers do not include Xrefs when using XOVER.
6378   (setq gnus-article-internal-prepare-hook '(gnus-article-get-xrefs))
6379   (let ((mail-parse-charset gnus-newsgroup-charset)
6380         (mail-parse-ignored-charsets gnus-newsgroup-ignored-charsets)
6381         (cur nntp-server-buffer)
6382         (dependencies (or dependencies gnus-newsgroup-dependencies))
6383         (allp (cond
6384                ((eq gnus-read-all-available-headers t)
6385                 t)
6386                ((and (stringp gnus-read-all-available-headers)
6387                      group)
6388                 (string-match gnus-read-all-available-headers group))
6389                (t
6390                 nil)))
6391         number headers header)
6392     (with-current-buffer nntp-server-buffer
6393       (subst-char-in-region (point-min) (point-max) ?\r ?  t)
6394       ;; Allow the user to mangle the headers before parsing them.
6395       (gnus-run-hooks 'gnus-parse-headers-hook)
6396       (goto-char (point-min))
6397       (gnus-parse-without-error
6398         (while (and (or sequence allp)
6399                     (not (eobp)))
6400           (setq number (read cur))
6401           (when (not allp)
6402             (while (and sequence
6403                         (< (car sequence) number))
6404               (setq sequence (cdr sequence))))
6405           (when (and (or allp
6406                          (and sequence
6407                               (eq number (car sequence))))
6408                      (progn
6409                        (setq sequence (cdr sequence))
6410                        (setq header (inline
6411                                       (gnus-nov-parse-line
6412                                        number dependencies force-new)))))
6413             (push header headers))
6414           (forward-line 1)))
6415       ;; A common bug in inn is that if you have posted an article and
6416       ;; then retrieves the active file, it will answer correctly --
6417       ;; the new article is included.  However, a NOV entry for the
6418       ;; article may not have been generated yet, so this may fail.
6419       ;; We work around this problem by retrieving the last few
6420       ;; headers using HEAD.
6421       (if (or (not also-fetch-heads)
6422               (not sequence))
6423           ;; We (probably) got all the headers.
6424           (nreverse headers)
6425         (let ((gnus-nov-is-evil t))
6426           (nconc
6427            (nreverse headers)
6428            (when (eq (gnus-retrieve-headers sequence group) 'headers)
6429              (gnus-get-newsgroup-headers))))))))
6430
6431 (defun gnus-article-get-xrefs ()
6432   "Fill in the Xref value in `gnus-current-headers', if necessary.
6433 This is meant to be called in `gnus-article-internal-prepare-hook'."
6434   (let ((headers (with-current-buffer gnus-summary-buffer
6435                    gnus-current-headers)))
6436     (or (not gnus-use-cross-reference)
6437         (not headers)
6438         (and (mail-header-xref headers)
6439              (not (string= (mail-header-xref headers) "")))
6440         (let ((case-fold-search t)
6441               xref)
6442           (save-restriction
6443             (nnheader-narrow-to-headers)
6444             (goto-char (point-min))
6445             (when (or (and (not (eobp))
6446                            (eq (downcase (char-after)) ?x)
6447                            (looking-at "Xref:"))
6448                       (search-forward "\nXref:" nil t))
6449               (goto-char (1+ (match-end 0)))
6450               (setq xref (buffer-substring (point) (point-at-eol)))
6451               (mail-header-set-xref headers xref)))))))
6452
6453 (defun gnus-summary-insert-subject (id &optional old-header use-old-header)
6454   "Find article ID and insert the summary line for that article.
6455 OLD-HEADER can either be a header or a line number to insert
6456 the subject line on."
6457   (let* ((line (and (numberp old-header) old-header))
6458          (old-header (and (vectorp old-header) old-header))
6459          (header (cond ((and old-header use-old-header)
6460                         old-header)
6461                        ((and (numberp id)
6462                              (gnus-number-to-header id))
6463                         (gnus-number-to-header id))
6464                        (t
6465                         (gnus-read-header id))))
6466          (number (and (numberp id) id))
6467          d)
6468     (when header
6469       ;; Rebuild the thread that this article is part of and go to the
6470       ;; article we have fetched.
6471       (when (and (not gnus-show-threads)
6472                  old-header)
6473         (when (and number
6474                    (setq d (gnus-data-find (mail-header-number old-header))))
6475           (goto-char (gnus-data-pos d))
6476           (gnus-data-remove
6477            number
6478            (- (point-at-bol)
6479               (prog1
6480                   (1+ (point-at-eol))
6481                 (gnus-delete-line))))))
6482       ;; Remove list identifiers from subject.
6483       (when gnus-list-identifiers
6484         (let ((gnus-newsgroup-headers (list header)))
6485           (gnus-summary-remove-list-identifiers)))
6486       (when old-header
6487         (mail-header-set-number header (mail-header-number old-header)))
6488       (setq gnus-newsgroup-sparse
6489             (delq (setq number (mail-header-number header))
6490                   gnus-newsgroup-sparse))
6491       (setq gnus-newsgroup-ancient (delq number gnus-newsgroup-ancient))
6492       (push number gnus-newsgroup-limit)
6493       (gnus-rebuild-thread (mail-header-id header) line)
6494       (gnus-summary-goto-subject number nil t))
6495     (when (and (numberp number)
6496                (> number 0))
6497       ;; We have to update the boundaries even if we can't fetch the
6498       ;; article if ID is a number -- so that the next `P' or `N'
6499       ;; command will fetch the previous (or next) article even
6500       ;; if the one we tried to fetch this time has been canceled.
6501       (when (> number gnus-newsgroup-end)
6502         (setq gnus-newsgroup-end number))
6503       (when (< number gnus-newsgroup-begin)
6504         (setq gnus-newsgroup-begin number))
6505       (setq gnus-newsgroup-unselected
6506             (delq number gnus-newsgroup-unselected)))
6507     ;; Report back a success?
6508     (and header (mail-header-number header))))
6509
6510 ;;; Process/prefix in the summary buffer
6511
6512 (defun gnus-summary-work-articles (n)
6513   "Return a list of articles to be worked upon.
6514 The prefix argument, the list of process marked articles, and the
6515 current article will be taken into consideration."
6516   (with-current-buffer gnus-summary-buffer
6517     (cond
6518      (n
6519       ;; A numerical prefix has been given.
6520       (setq n (prefix-numeric-value n))
6521       (let ((backward (< n 0))
6522             (n (abs (prefix-numeric-value n)))
6523             articles article)
6524         (save-excursion
6525           (while
6526               (and (> n 0)
6527                    (push (setq article (gnus-summary-article-number))
6528                          articles)
6529                    (if backward
6530                        (gnus-summary-find-prev nil article)
6531                      (gnus-summary-find-next nil article)))
6532             (decf n)))
6533         (nreverse articles)))
6534      ((and (gnus-region-active-p) (mark))
6535       (message "region active")
6536       ;; Work on the region between point and mark.
6537       (let ((max (max (point) (mark)))
6538             articles article)
6539         (save-excursion
6540           (goto-char (min (point) (mark)))
6541           (while
6542               (and
6543                (push (setq article (gnus-summary-article-number)) articles)
6544                (gnus-summary-find-next nil article)
6545                (< (point) max)))
6546           (nreverse articles))))
6547      (gnus-newsgroup-processable
6548       ;; There are process-marked articles present.
6549       ;; Save current state.
6550       (gnus-summary-save-process-mark)
6551       ;; Return the list.
6552       (reverse gnus-newsgroup-processable))
6553      (t
6554       ;; Just return the current article.
6555       (list (gnus-summary-article-number))))))
6556
6557 (defmacro gnus-summary-iterate (arg &rest forms)
6558   "Iterate over the process/prefixed articles and do FORMS.
6559 ARG is the interactive prefix given to the command.  FORMS will be
6560 executed with point over the summary line of the articles."
6561   (let ((articles (make-symbol "gnus-summary-iterate-articles")))
6562     `(let ((,articles (gnus-summary-work-articles ,arg)))
6563        (while ,articles
6564          (gnus-summary-goto-subject (car ,articles))
6565          ,@forms
6566          (pop ,articles)))))
6567
6568 (put 'gnus-summary-iterate 'lisp-indent-function 1)
6569 (put 'gnus-summary-iterate 'edebug-form-spec '(form body))
6570
6571 (defun gnus-summary-save-process-mark ()
6572   "Push the current set of process marked articles on the stack."
6573   (interactive)
6574   (push (copy-sequence gnus-newsgroup-processable)
6575         gnus-newsgroup-process-stack))
6576
6577 (defun gnus-summary-kill-process-mark ()
6578   "Push the current set of process marked articles on the stack and unmark."
6579   (interactive)
6580   (gnus-summary-save-process-mark)
6581   (gnus-summary-unmark-all-processable))
6582
6583 (defun gnus-summary-yank-process-mark ()
6584   "Pop the last process mark state off the stack and restore it."
6585   (interactive)
6586   (unless gnus-newsgroup-process-stack
6587     (error "Empty mark stack"))
6588   (gnus-summary-process-mark-set (pop gnus-newsgroup-process-stack)))
6589
6590 (defun gnus-summary-process-mark-set (set)
6591   "Make SET into the current process marked articles."
6592   (gnus-summary-unmark-all-processable)
6593   (mapc 'gnus-summary-set-process-mark set))
6594
6595 ;;; Searching and stuff
6596
6597 (defun gnus-summary-search-group (&optional backward use-level)
6598   "Search for next unread newsgroup.
6599 If optional argument BACKWARD is non-nil, search backward instead."
6600   (with-current-buffer gnus-group-buffer
6601     (when (gnus-group-search-forward
6602            backward nil (if use-level (gnus-group-group-level) nil))
6603       (gnus-group-group-name))))
6604
6605 (defun gnus-summary-best-group (&optional exclude-group)
6606   "Find the name of the best unread group.
6607 If EXCLUDE-GROUP, do not go to this group."
6608   (with-current-buffer gnus-group-buffer
6609     (save-excursion
6610       (gnus-group-best-unread-group exclude-group))))
6611
6612 (defun gnus-summary-find-next (&optional unread article backward)
6613   (if backward
6614       (gnus-summary-find-prev unread article)
6615     (let* ((dummy (gnus-summary-article-intangible-p))
6616            (article (or article (gnus-summary-article-number)))
6617            (data (gnus-data-find-list article))
6618            result)
6619       (when (and (not dummy)
6620                  (or (not gnus-summary-check-current)
6621                      (not unread)
6622                      (not (gnus-data-unread-p (car data)))))
6623         (setq data (cdr data)))
6624       (when (setq result
6625                   (if unread
6626                       (progn
6627                         (while data
6628                           (unless (memq (gnus-data-number (car data))
6629                                         (cond
6630                                          ((eq gnus-auto-goto-ignores
6631                                               'always-undownloaded)
6632                                           gnus-newsgroup-undownloaded)
6633                                          (gnus-plugged
6634                                           nil)
6635                                          ((eq gnus-auto-goto-ignores
6636                                               'unfetched)
6637                                           gnus-newsgroup-unfetched)
6638                                          ((eq gnus-auto-goto-ignores
6639                                               'undownloaded)
6640                                           gnus-newsgroup-undownloaded)))
6641                             (when (gnus-data-unread-p (car data))
6642                               (setq result (car data)
6643                                     data nil)))
6644                           (setq data (cdr data)))
6645                         result)
6646                     (car data)))
6647         (goto-char (gnus-data-pos result))
6648         (gnus-data-number result)))))
6649
6650 (defun gnus-summary-find-prev (&optional unread article)
6651   (let* ((eobp (eobp))
6652          (article (or article (gnus-summary-article-number)))
6653          (data (gnus-data-find-list article (gnus-data-list 'rev)))
6654          result)
6655     (when (and (not eobp)
6656                (or (not gnus-summary-check-current)
6657                    (not unread)
6658                    (not (gnus-data-unread-p (car data)))))
6659       (setq data (cdr data)))
6660     (when (setq result
6661                 (if unread
6662                     (progn
6663                       (while data
6664                         (unless (memq (gnus-data-number (car data))
6665                                       (cond
6666                                        ((eq gnus-auto-goto-ignores
6667                                             'always-undownloaded)
6668                                         gnus-newsgroup-undownloaded)
6669                                        (gnus-plugged
6670                                         nil)
6671                                        ((eq gnus-auto-goto-ignores
6672                                             'unfetched)
6673                                         gnus-newsgroup-unfetched)
6674                                        ((eq gnus-auto-goto-ignores
6675                                             'undownloaded)
6676                                         gnus-newsgroup-undownloaded)))
6677                           (when (gnus-data-unread-p (car data))
6678                             (setq result (car data)
6679                                   data nil)))
6680                         (setq data (cdr data)))
6681                       result)
6682                   (car data)))
6683       (goto-char (gnus-data-pos result))
6684       (gnus-data-number result))))
6685
6686 (defun gnus-summary-find-subject (subject &optional unread backward article)
6687   (let* ((simp-subject (gnus-simplify-subject-fully subject))
6688          (article (or article (gnus-summary-article-number)))
6689          (articles (gnus-data-list backward))
6690          (arts (gnus-data-find-list article articles))
6691          result)
6692     (when (or (not gnus-summary-check-current)
6693               (not unread)
6694               (not (gnus-data-unread-p (car arts))))
6695       (setq arts (cdr arts)))
6696     (while arts
6697       (and (or (not unread)
6698                (gnus-data-unread-p (car arts)))
6699            (vectorp (gnus-data-header (car arts)))
6700            (gnus-subject-equal
6701             simp-subject (mail-header-subject (gnus-data-header (car arts))) t)
6702            (setq result (car arts)
6703                  arts nil))
6704       (setq arts (cdr arts)))
6705     (and result
6706          (goto-char (gnus-data-pos result))
6707          (gnus-data-number result))))
6708
6709 (defun gnus-summary-search-forward (&optional unread subject backward)
6710   "Search forward for an article.
6711 If UNREAD, look for unread articles.  If SUBJECT, look for
6712 articles with that subject.  If BACKWARD, search backward instead."
6713   (cond (subject (gnus-summary-find-subject subject unread backward))
6714         (backward (gnus-summary-find-prev unread))
6715         (t (gnus-summary-find-next unread))))
6716
6717 (defun gnus-recenter (&optional n)
6718   "Center point in window and redisplay frame.
6719 Also do horizontal recentering."
6720   (interactive "P")
6721   (when (and gnus-auto-center-summary
6722              (not (eq gnus-auto-center-summary 'vertical)))
6723     (gnus-horizontal-recenter))
6724   (if (fboundp 'recenter-top-bottom)
6725       (recenter-top-bottom n)
6726     (recenter n)))
6727
6728 (put 'gnus-recenter 'isearch-scroll t)
6729
6730 (defun gnus-forward-line-ignore-invisible (n)
6731   "Move N lines forward (backward if N is negative).
6732 Like forward-line, but skip over (and don't count) invisible lines."
6733   (let (done)
6734     (while (and (> n 0) (not done))
6735       ;; If the following character is currently invisible,
6736       ;; skip all characters with that same `invisible' property value.
6737       (while (gnus-invisible-p (point))
6738         (goto-char (gnus-next-char-property-change (point))))
6739       (forward-line 1)
6740       (if (eobp)
6741           (setq done t)
6742         (setq n (1- n))))
6743     (while (and (< n 0) (not done))
6744       (forward-line -1)
6745       (if (bobp) (setq done t)
6746         (setq n (1+ n))
6747         (while (and (not (bobp)) (gnus-invisible-p (1- (point))))
6748           (goto-char (gnus-previous-char-property-change (point))))))))
6749
6750 (defun gnus-summary-recenter ()
6751   "Center point in the summary window.
6752 If `gnus-auto-center-summary' is nil, or the article buffer isn't
6753 displayed, no centering will be performed."
6754   ;; Suggested by earle@mahendo.JPL.NASA.GOV (Greg Earle).
6755   ;; Recenter only when requested.  Suggested by popovich@park.cs.columbia.edu.
6756   (interactive)
6757   ;; The user has to want it.
6758   (when gnus-auto-center-summary
6759     (let* ((top (cond ((< (window-height) 4) 0)
6760                       ((< (window-height) 7) 1)
6761                       (t (if (numberp gnus-auto-center-summary)
6762                              gnus-auto-center-summary
6763                            (/ (1- (window-height)) 2)))))
6764            (height (1- (window-height)))
6765            (bottom (save-excursion
6766                      (goto-char (point-max))
6767                      (gnus-forward-line-ignore-invisible (- height))
6768                      (point)))
6769            (window (get-buffer-window (current-buffer))))
6770       (when (get-buffer-window gnus-article-buffer)
6771         ;; Only do recentering when the article buffer is displayed,
6772         ;; Set the window start to either `bottom', which is the biggest
6773         ;; possible valid number, or the second line from the top,
6774         ;; whichever is the least.
6775         (let ((top-pos (save-excursion
6776                          (gnus-forward-line-ignore-invisible (- top))
6777                          (point))))
6778           (if (> bottom top-pos)
6779               ;; Keep the second line from the top visible
6780               (set-window-start window top-pos)
6781             ;; Try to keep the bottom line visible; if it's partially
6782             ;; obscured, either scroll one more line to make it fully
6783             ;; visible, or revert to using TOP-POS.
6784             (save-excursion
6785               (goto-char (point-max))
6786               (gnus-forward-line-ignore-invisible -1)
6787               (let ((last-line-start (point)))
6788                 (goto-char bottom)
6789                 (set-window-start window (point) t)
6790                 (when (not (pos-visible-in-window-p last-line-start window))
6791                   (gnus-forward-line-ignore-invisible 1)
6792                   (set-window-start window (min (point) top-pos) t)))))))
6793       ;; Do horizontal recentering while we're at it.
6794       (when (and (get-buffer-window (current-buffer) t)
6795                  (not (eq gnus-auto-center-summary 'vertical)))
6796         (let ((selected (selected-window)))
6797           (select-window (get-buffer-window (current-buffer) t))
6798           (gnus-summary-position-point)
6799           (gnus-horizontal-recenter)
6800           (select-window selected))))))
6801
6802 (defun gnus-summary-jump-to-group (newsgroup)
6803   "Move point to NEWSGROUP in group mode buffer."
6804   ;; Keep update point of group mode buffer if visible.
6805   (if (eq (current-buffer) (get-buffer gnus-group-buffer))
6806       (save-window-excursion
6807         ;; Take care of tree window mode.
6808         (when (get-buffer-window gnus-group-buffer)
6809           (pop-to-buffer gnus-group-buffer))
6810         (gnus-group-jump-to-group newsgroup))
6811     (save-excursion
6812       ;; Take care of tree window mode.
6813       (if (get-buffer-window gnus-group-buffer 0)
6814           (pop-to-buffer gnus-group-buffer)
6815         (set-buffer gnus-group-buffer))
6816       (gnus-group-jump-to-group newsgroup))))
6817
6818 ;; This function returns a list of article numbers based on the
6819 ;; difference between the ranges of read articles in this group and
6820 ;; the range of active articles.
6821 (defun gnus-list-of-unread-articles (group)
6822   (let* ((read (gnus-info-read (gnus-get-info group)))
6823          (active (or (gnus-active group) (gnus-activate-group group)))
6824          (last (or (cdr active)
6825                    (error "Group %s couldn't be activated " group)))
6826          (bottom (if gnus-newsgroup-maximum-articles
6827                      (max (car active)
6828                           (- last gnus-newsgroup-maximum-articles -1))
6829                    (car active)))
6830          first nlast unread)
6831     ;; If none are read, then all are unread.
6832     (if (not read)
6833         (setq first bottom)
6834       ;; If the range of read articles is a single range, then the
6835       ;; first unread article is the article after the last read
6836       ;; article.  Sounds logical, doesn't it?
6837       (if (and (not (listp (cdr read)))
6838                (or (< (car read) bottom)
6839                    (progn (setq read (list read))
6840                           nil)))
6841           (setq first (max bottom (1+ (cdr read))))
6842         ;; `read' is a list of ranges.
6843         (when (/= (setq nlast (or (and (numberp (car read)) (car read))
6844                                   (caar read)))
6845                   1)
6846           (setq first bottom))
6847         (while read
6848           (when first
6849             (while (< first nlast)
6850               (setq unread (cons first unread)
6851                     first (1+ first))))
6852           (setq first (1+ (if (atom (car read)) (car read) (cdar read))))
6853           (setq nlast (if (atom (cadr read)) (cadr read) (caadr read)))
6854           (setq read (cdr read)))))
6855     ;; And add the last unread articles.
6856     (while (<= first last)
6857       (setq unread (cons first unread)
6858             first (1+ first)))
6859     ;; Return the list of unread articles.
6860     (delq 0 (nreverse unread))))
6861
6862 (defun gnus-list-of-read-articles (group)
6863   "Return a list of unread, unticked and non-dormant articles."
6864   (let* ((info (gnus-get-info group))
6865          (marked (gnus-info-marks info))
6866          (active (gnus-active group)))
6867     (and info active
6868          (gnus-list-range-difference
6869           (gnus-list-range-difference
6870            (gnus-sorted-complement
6871             (gnus-uncompress-range
6872              (if gnus-newsgroup-maximum-articles
6873                  (cons (max (car active)
6874                             (- (cdr active)
6875                                gnus-newsgroup-maximum-articles
6876                                -1))
6877                        (cdr active))
6878                active))
6879             (gnus-list-of-unread-articles group))
6880            (cdr (assq 'dormant marked)))
6881           (cdr (assq 'tick marked))))))
6882
6883 ;; This function returns a sequence of article numbers based on the
6884 ;; difference between the ranges of read articles in this group and
6885 ;; the range of active articles.
6886 (defun gnus-sequence-of-unread-articles (group)
6887   (let* ((read (gnus-info-read (gnus-get-info group)))
6888          (active (or (gnus-active group) (gnus-activate-group group)))
6889          (last (cdr active))
6890          (bottom (if gnus-newsgroup-maximum-articles
6891                      (max (car active)
6892                           (- last gnus-newsgroup-maximum-articles -1))
6893                    (car active)))
6894          first nlast unread)
6895     ;; If none are read, then all are unread.
6896     (if (not read)
6897         (setq first bottom)
6898       ;; If the range of read articles is a single range, then the
6899       ;; first unread article is the article after the last read
6900       ;; article.  Sounds logical, doesn't it?
6901       (if (and (not (listp (cdr read)))
6902                (or (< (car read) bottom)
6903                    (progn (setq read (list read))
6904                           nil)))
6905           (setq first (max bottom (1+ (cdr read))))
6906         ;; `read' is a list of ranges.
6907         (when (/= (setq nlast (or (and (numberp (car read)) (car read))
6908                                   (caar read)))
6909                   1)
6910           (setq first bottom))
6911         (while read
6912           (when first
6913             (push (cons first nlast) unread))
6914           (setq first (1+ (if (atom (car read)) (car read) (cdar read))))
6915           (setq nlast (if (atom (cadr read)) (cadr read) (caadr read)))
6916           (setq read (cdr read)))))
6917     ;; And add the last unread articles.
6918     (cond ((not (and first last))
6919            nil)
6920           ((< first last)
6921            (push (cons first last) unread))
6922           ((= first last)
6923            (push first unread)))
6924     ;; Return the sequence of unread articles.
6925     (delq 0 (nreverse unread))))
6926
6927 ;; Various summary commands
6928
6929 (defun gnus-summary-select-article-buffer ()
6930   "Reconfigure windows to show article buffer."
6931   (interactive)
6932   (if (not (gnus-buffer-live-p gnus-article-buffer))
6933       (error "There is no article buffer for this summary buffer")
6934     (gnus-configure-windows 'article)
6935     (select-window (get-buffer-window gnus-article-buffer))))
6936
6937 (defun gnus-summary-universal-argument (arg)
6938   "Perform any operation on all articles that are process/prefixed."
6939   (interactive "P")
6940   (let ((articles (gnus-summary-work-articles arg))
6941         func article)
6942     (if (eq
6943          (setq
6944           func
6945           (key-binding
6946            (read-key-sequence
6947             (substitute-command-keys
6948              "\\<gnus-summary-mode-map>\\[gnus-summary-universal-argument]"))))
6949          'undefined)
6950         (gnus-error 1 "Undefined key")
6951       (save-excursion
6952         (while articles
6953           (gnus-summary-goto-subject (setq article (pop articles)))
6954           (let (gnus-newsgroup-processable)
6955             (command-execute func))
6956           (gnus-summary-remove-process-mark article)))))
6957   (gnus-summary-position-point))
6958
6959 (defun gnus-summary-toggle-truncation (&optional arg)
6960   "Toggle truncation of summary lines.
6961 With ARG, turn line truncation on if ARG is positive."
6962   (interactive "P")
6963   (setq truncate-lines
6964         (if (null arg) (not truncate-lines)
6965           (> (prefix-numeric-value arg) 0)))
6966   (redraw-display))
6967
6968 (defun gnus-summary-find-for-reselect ()
6969   "Return the number of an article to stay on across a reselect.
6970 The current article is considered, then following articles, then previous
6971 articles.  An article is sought which is not cancelled and isn't a temporary
6972 insertion from another group.  If there's no such then return a dummy 0."
6973   (let (found)
6974     (dolist (rev '(nil t))
6975       (unless found      ; don't demand the reverse list if we don't need it
6976         (let ((data (gnus-data-find-list
6977                      (gnus-summary-article-number) (gnus-data-list rev))))
6978           (while (and data (not found))
6979             (if (and (< 0 (gnus-data-number (car data)))
6980                      (not (eq gnus-canceled-mark (gnus-data-mark (car data)))))
6981                 (setq found (gnus-data-number (car data))))
6982             (setq data (cdr data))))))
6983     (or found 0)))
6984
6985 (defun gnus-summary-reselect-current-group (&optional all rescan)
6986   "Exit and then reselect the current newsgroup.
6987 The prefix argument ALL means to select all articles."
6988   (interactive "P")
6989   (when (gnus-ephemeral-group-p gnus-newsgroup-name)
6990     (error "Ephemeral groups can't be reselected"))
6991   (let ((current-subject (gnus-summary-find-for-reselect))
6992         (group gnus-newsgroup-name))
6993     (setq gnus-newsgroup-begin nil)
6994     (gnus-summary-exit nil 'leave-hidden)
6995     ;; We have to adjust the point of group mode buffer because
6996     ;; point was moved to the next unread newsgroup by exiting.
6997     (gnus-summary-jump-to-group group)
6998     (when rescan
6999       (save-excursion
7000         (gnus-group-get-new-news-this-group 1)))
7001     (gnus-group-read-group all t)
7002     (gnus-summary-goto-subject current-subject nil t)))
7003
7004 (defun gnus-summary-rescan-group (&optional all)
7005   "Exit the newsgroup, ask for new articles, and select the newsgroup."
7006   (interactive "P")
7007   (gnus-summary-reselect-current-group all t))
7008
7009 (defun gnus-summary-update-info (&optional non-destructive)
7010   (save-excursion
7011     (let ((group gnus-newsgroup-name))
7012       (when group
7013         (when gnus-newsgroup-kill-headers
7014           (setq gnus-newsgroup-killed
7015                 (gnus-compress-sequence
7016                  (gnus-sorted-union
7017                   (gnus-list-range-intersection
7018                    gnus-newsgroup-unselected gnus-newsgroup-killed)
7019                   gnus-newsgroup-unreads)
7020                  t)))
7021         (unless (listp (cdr gnus-newsgroup-killed))
7022           (setq gnus-newsgroup-killed (list gnus-newsgroup-killed)))
7023         (let ((headers gnus-newsgroup-headers))
7024           ;; Set the new ranges of read articles.
7025           (with-current-buffer gnus-group-buffer
7026             (gnus-undo-force-boundary))
7027           (gnus-update-read-articles
7028            group (gnus-sorted-union
7029                   gnus-newsgroup-unreads gnus-newsgroup-unselected))
7030           ;; Set the current article marks.
7031           (let ((gnus-newsgroup-scored
7032                  (if (and (not gnus-save-score)
7033                           (not non-destructive))
7034                      nil
7035                    gnus-newsgroup-scored)))
7036             (save-excursion
7037               (gnus-update-marks)))
7038           ;; Do the cross-ref thing.
7039           (when gnus-use-cross-reference
7040             (gnus-mark-xrefs-as-read group headers gnus-newsgroup-unreads))
7041           ;; Do not switch windows but change the buffer to work.
7042           (set-buffer gnus-group-buffer)
7043           (unless (gnus-ephemeral-group-p group)
7044             (gnus-group-update-group group)))))))
7045
7046 (defun gnus-summary-save-newsrc (&optional force)
7047   "Save the current number of read/marked articles in the dribble buffer.
7048 The dribble buffer will then be saved.
7049 If FORCE (the prefix), also save the .newsrc file(s)."
7050   (interactive "P")
7051   (gnus-summary-update-info t)
7052   (if force
7053       (gnus-save-newsrc-file)
7054     (gnus-dribble-save)))
7055
7056 (declare-function gnus-cache-write-active "gnus-cache" (&optional force))
7057
7058 (defun gnus-summary-exit (&optional temporary leave-hidden)
7059   "Exit reading current newsgroup, and then return to group selection mode.
7060 `gnus-exit-group-hook' is called with no arguments if that value is non-nil."
7061   (interactive)
7062   (gnus-set-global-variables)
7063   (when (gnus-buffer-live-p gnus-article-buffer)
7064     (with-current-buffer gnus-article-buffer
7065       (mm-destroy-parts gnus-article-mime-handles)
7066       ;; Set it to nil for safety reason.
7067       (setq gnus-article-mime-handle-alist nil)
7068       (setq gnus-article-mime-handles nil)))
7069   (gnus-kill-save-kill-buffer)
7070   (gnus-async-halt-prefetch)
7071   (let* ((group gnus-newsgroup-name)
7072          (quit-config (gnus-group-quit-config gnus-newsgroup-name))
7073          (gnus-group-is-exiting-p t)
7074          (mode major-mode)
7075          (group-point nil)
7076          (buf (current-buffer)))
7077     (unless quit-config
7078       ;; Do adaptive scoring, and possibly save score files.
7079       (when gnus-newsgroup-adaptive
7080         (gnus-score-adaptive))
7081       (when gnus-use-scoring
7082         (gnus-score-save)))
7083     (gnus-run-hooks 'gnus-summary-prepare-exit-hook)
7084     ;; If we have several article buffers, we kill them at exit.
7085     (unless gnus-single-article-buffer
7086       (when (gnus-buffer-live-p gnus-article-buffer)
7087         (with-current-buffer gnus-article-buffer
7088           ;; Don't kill sticky article buffers
7089           (unless (eq major-mode 'gnus-sticky-article-mode)
7090             (gnus-kill-buffer gnus-article-buffer)
7091             (setq gnus-article-current nil))))
7092       (gnus-kill-buffer gnus-original-article-buffer))
7093     (when gnus-use-cache
7094       (gnus-cache-possibly-remove-articles)
7095       (gnus-cache-save-buffers))
7096     (gnus-async-prefetch-remove-group group)
7097     (when gnus-suppress-duplicates
7098       (gnus-dup-enter-articles))
7099     (when gnus-use-trees
7100       (gnus-tree-close group))
7101     (when gnus-use-cache
7102       (gnus-cache-write-active))
7103     ;; Remove entries for this group.
7104     (nnmail-purge-split-history (gnus-group-real-name group))
7105     ;; Make all changes in this group permanent.
7106     (unless quit-config
7107       (gnus-run-hooks 'gnus-exit-group-hook)
7108       (gnus-summary-update-info))
7109     (gnus-close-group group)
7110     ;; Make sure where we were, and go to next newsgroup.
7111     (set-buffer gnus-group-buffer)
7112     (unless quit-config
7113       (gnus-group-jump-to-group group))
7114     (gnus-run-hooks 'gnus-summary-exit-hook)
7115     (unless (or quit-config
7116                 (not gnus-summary-next-group-on-exit)
7117                 ;; If this group has disappeared from the summary
7118                 ;; buffer, don't skip forwards.
7119                 (not (string= group (gnus-group-group-name))))
7120       (gnus-group-next-unread-group 1))
7121     (setq group-point (point))
7122     (if temporary
7123         nil                             ;Nothing to do.
7124       (set-buffer buf)
7125       (if (not gnus-kill-summary-on-exit)
7126           (progn
7127             (gnus-deaden-summary)
7128             (setq mode nil))
7129         ;; We set all buffer-local variables to nil.  It is unclear why
7130         ;; this is needed, but if we don't, buffer-local variables are
7131         ;; not garbage-collected, it seems.  This would the lead to en
7132         ;; ever-growing Emacs.
7133         (gnus-summary-clear-local-variables)
7134         (let ((gnus-summary-local-variables gnus-newsgroup-variables))
7135           (gnus-summary-clear-local-variables))
7136         (when (get-buffer gnus-article-buffer)
7137           (bury-buffer gnus-article-buffer))
7138         ;; Return to group mode buffer.
7139         (when (eq mode 'gnus-summary-mode)
7140           (gnus-kill-buffer buf)))
7141       (setq gnus-current-select-method gnus-select-method)
7142       (set-buffer gnus-group-buffer)
7143       (if quit-config
7144           (gnus-handle-ephemeral-exit quit-config)
7145         (goto-char group-point)
7146         ;; If gnus-group-buffer is already displayed, make sure we also move
7147         ;; the cursor in the window that displays it.
7148         (let ((win (get-buffer-window (current-buffer) 0)))
7149           (if win (set-window-point win (point))))
7150         (unless leave-hidden
7151           (gnus-configure-windows 'group 'force)))
7152       ;; Clear the current group name.
7153       (unless quit-config
7154         (setq gnus-newsgroup-name nil)))))
7155
7156 (defalias 'gnus-summary-quit 'gnus-summary-exit-no-update)
7157 (defun gnus-summary-exit-no-update (&optional no-questions)
7158   "Quit reading current newsgroup without updating read article info."
7159   (interactive)
7160   (let* ((group gnus-newsgroup-name)
7161          (gnus-group-is-exiting-p t)
7162          (gnus-group-is-exiting-without-update-p t)
7163          (quit-config (gnus-group-quit-config group)))
7164     (when (or no-questions
7165               gnus-expert-user
7166               (gnus-y-or-n-p "Discard changes to this group and exit? "))
7167       (gnus-async-halt-prefetch)
7168       (run-hooks 'gnus-summary-prepare-exit-hook)
7169       (when (gnus-buffer-live-p gnus-article-buffer)
7170         (with-current-buffer gnus-article-buffer
7171           (mm-destroy-parts gnus-article-mime-handles)
7172           ;; Set it to nil for safety reason.
7173           (setq gnus-article-mime-handle-alist nil)
7174           (setq gnus-article-mime-handles nil)))
7175       ;; If we have several article buffers, we kill them at exit.
7176       (unless gnus-single-article-buffer
7177         (gnus-kill-buffer gnus-article-buffer)
7178         (gnus-kill-buffer gnus-original-article-buffer)
7179         (setq gnus-article-current nil))
7180       (if (not gnus-kill-summary-on-exit)
7181           (gnus-deaden-summary)
7182         (gnus-close-group group)
7183         (gnus-summary-clear-local-variables)
7184         (let ((gnus-summary-local-variables gnus-newsgroup-variables))
7185           (gnus-summary-clear-local-variables))
7186         (gnus-kill-buffer gnus-summary-buffer))
7187       (unless gnus-single-article-buffer
7188         (setq gnus-article-current nil))
7189       (when gnus-use-trees
7190         (gnus-tree-close group))
7191       (gnus-async-prefetch-remove-group group)
7192       (when (get-buffer gnus-article-buffer)
7193         (bury-buffer gnus-article-buffer))
7194       ;; Return to the group buffer.
7195       (gnus-configure-windows 'group 'force)
7196       ;; Clear the current group name.
7197       (setq gnus-newsgroup-name nil)
7198       (unless (gnus-ephemeral-group-p group)
7199         (gnus-group-update-group group))
7200       (when (equal (gnus-group-group-name) group)
7201         (gnus-group-next-unread-group 1))
7202       (when quit-config
7203         (gnus-handle-ephemeral-exit quit-config)))))
7204
7205 (defun gnus-handle-ephemeral-exit (quit-config)
7206   "Handle movement when leaving an ephemeral group.
7207 The state which existed when entering the ephemeral is reset."
7208   (if (not (buffer-name (car quit-config)))
7209       (gnus-configure-windows 'group 'force)
7210     (set-buffer (car quit-config))
7211     (cond ((eq major-mode 'gnus-summary-mode)
7212            (gnus-set-global-variables))
7213           ((eq major-mode 'gnus-article-mode)
7214            (save-current-buffer
7215              ;; The `gnus-summary-buffer' variable may point
7216              ;; to the old summary buffer when using a single
7217              ;; article buffer.
7218              (unless (gnus-buffer-live-p gnus-summary-buffer)
7219                (set-buffer gnus-group-buffer))
7220              (set-buffer gnus-summary-buffer)
7221              (gnus-set-global-variables))))
7222     (if (or (eq (cdr quit-config) 'article)
7223             (eq (cdr quit-config) 'pick))
7224         (if (and (boundp 'gnus-pick-mode) (symbol-value 'gnus-pick-mode))
7225             (gnus-configure-windows 'pick 'force)
7226           (gnus-configure-windows (cdr quit-config) 'force))
7227       (gnus-configure-windows (cdr quit-config) 'force))
7228     (when (eq major-mode 'gnus-summary-mode)
7229       (if (memq gnus-auto-select-on-ephemeral-exit '(next-noselect
7230                                                      next-unread-noselect))
7231           (when (zerop (cond ((eq gnus-auto-select-on-ephemeral-exit
7232                                   'next-noselect)
7233                               (gnus-summary-next-subject 1 nil t))
7234                              ((eq gnus-auto-select-on-ephemeral-exit
7235                                   'next-unread-noselect)
7236                               (gnus-summary-next-subject 1 t t))))
7237             ;; Hide the article buffer which displays the article different
7238             ;; from the one that the cursor points to in the summary buffer.
7239             (gnus-configure-windows 'summary 'force))
7240         (cond ((eq gnus-auto-select-on-ephemeral-exit 'next)
7241                (gnus-summary-next-subject 1))
7242               ((eq gnus-auto-select-on-ephemeral-exit 'next-unread)
7243                (gnus-summary-next-subject 1 t))))
7244       (gnus-summary-recenter)
7245       (gnus-summary-position-point))))
7246
7247 ;;; Dead summaries.
7248
7249 (defvar gnus-dead-summary-mode-map nil)
7250
7251 (unless gnus-dead-summary-mode-map
7252   (setq gnus-dead-summary-mode-map (make-keymap))
7253   (suppress-keymap gnus-dead-summary-mode-map)
7254   (substitute-key-definition
7255    'undefined 'gnus-summary-wake-up-the-dead gnus-dead-summary-mode-map)
7256   (dolist (key '("\C-d" "\r" "\177" [delete]))
7257     (define-key gnus-dead-summary-mode-map
7258       key 'gnus-summary-wake-up-the-dead))
7259   (dolist (key '("q" "Q"))
7260     (define-key gnus-dead-summary-mode-map key 'bury-buffer)))
7261
7262 (defvar gnus-dead-summary-mode nil
7263   "Minor mode for Gnus summary buffers.")
7264
7265 (defun gnus-dead-summary-mode (&optional arg)
7266   "Minor mode for Gnus summary buffers."
7267   (interactive "P")
7268   (when (eq major-mode 'gnus-summary-mode)
7269     (make-local-variable 'gnus-dead-summary-mode)
7270     (setq gnus-dead-summary-mode
7271           (if (null arg) (not gnus-dead-summary-mode)
7272             (> (prefix-numeric-value arg) 0)))
7273     (when gnus-dead-summary-mode
7274       (add-minor-mode
7275        'gnus-dead-summary-mode " Dead" gnus-dead-summary-mode-map))))
7276
7277 (defun gnus-deaden-summary ()
7278   "Make the current summary buffer into a dead summary buffer."
7279   ;; Kill any previous dead summary buffer.
7280   (when (and gnus-dead-summary
7281              (buffer-name gnus-dead-summary))
7282     (with-current-buffer gnus-dead-summary
7283       (when gnus-dead-summary-mode
7284         (kill-buffer (current-buffer)))))
7285   ;; Make this the current dead summary.
7286   (setq gnus-dead-summary (current-buffer))
7287   (gnus-dead-summary-mode 1)
7288   (let ((name (buffer-name)))
7289     (when (string-match "Summary" name)
7290       (rename-buffer
7291        (concat (substring name 0 (match-beginning 0)) "Dead "
7292                (substring name (match-beginning 0)))
7293        t)
7294       (bury-buffer))))
7295
7296 (defun gnus-kill-or-deaden-summary (buffer)
7297   "Kill or deaden the summary BUFFER."
7298   (save-excursion
7299     (when (and (buffer-name buffer)
7300                (not gnus-single-article-buffer))
7301       (with-current-buffer buffer
7302         (gnus-kill-buffer gnus-article-buffer)
7303         (gnus-kill-buffer gnus-original-article-buffer)))
7304     (cond
7305      ;; Kill the buffer.
7306      (gnus-kill-summary-on-exit
7307       (when (and gnus-use-trees
7308                  (gnus-buffer-exists-p buffer))
7309         (with-current-buffer buffer
7310           (gnus-tree-close gnus-newsgroup-name)))
7311       (gnus-kill-buffer buffer))
7312      ;; Deaden the buffer.
7313      ((gnus-buffer-exists-p buffer)
7314       (with-current-buffer buffer
7315         (gnus-deaden-summary))))))
7316
7317 (defun gnus-summary-wake-up-the-dead (&rest args)
7318   "Wake up the dead summary buffer."
7319   (interactive)
7320   (gnus-dead-summary-mode -1)
7321   (let ((name (buffer-name)))
7322     (when (string-match "Dead " name)
7323       (rename-buffer
7324        (concat (substring name 0 (match-beginning 0))
7325                (substring name (match-end 0)))
7326        t)))
7327   (gnus-message 3 "This dead summary is now alive again"))
7328
7329 ;; Suggested by Andrew Eskilsson <pi92ae@pt.hk-r.se>.
7330 (defun gnus-summary-fetch-faq (&optional faq-dir)
7331   "Fetch the FAQ for the current group.
7332 If FAQ-DIR (the prefix), prompt for a directory to search for the faq
7333 in."
7334   (interactive
7335    (list
7336     (when current-prefix-arg
7337       (completing-read
7338        "FAQ dir: " (and (listp gnus-group-faq-directory)
7339                         (mapcar 'list
7340                                 gnus-group-faq-directory))))))
7341   (let (gnus-faq-buffer)
7342     (when (setq gnus-faq-buffer
7343                 (gnus-group-fetch-faq gnus-newsgroup-name faq-dir))
7344       (gnus-configure-windows 'summary-faq))))
7345
7346 ;; Suggested by Per Abrahamsen <amanda@iesd.auc.dk>.
7347 (defun gnus-summary-describe-group (&optional force)
7348   "Describe the current newsgroup."
7349   (interactive "P")
7350   (gnus-group-describe-group force gnus-newsgroup-name))
7351
7352 (defun gnus-summary-describe-briefly ()
7353   "Describe summary mode commands briefly."
7354   (interactive)
7355   (gnus-message 6 (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")))
7356
7357 ;; Walking around group mode buffer from summary mode.
7358
7359 (defun gnus-summary-next-group (&optional no-article target-group backward)
7360   "Exit current newsgroup and then select next unread newsgroup.
7361 If prefix argument NO-ARTICLE is non-nil, no article is selected
7362 initially.  If TARGET-GROUP, go to this group.  If BACKWARD, go to
7363 previous group instead."
7364   (interactive "P")
7365   ;; Stop pre-fetching.
7366   (gnus-async-halt-prefetch)
7367   (let ((current-group gnus-newsgroup-name)
7368         (current-buffer (current-buffer))
7369         entered)
7370     ;; First we semi-exit this group to update Xrefs and all variables.
7371     ;; We can't do a real exit, because the window conf must remain
7372     ;; the same in case the user is prompted for info, and we don't
7373     ;; want the window conf to change before that...
7374     (gnus-summary-exit t)
7375     (while (not entered)
7376       ;; Then we find what group we are supposed to enter.
7377       (set-buffer gnus-group-buffer)
7378       (gnus-group-jump-to-group current-group)
7379       (setq target-group
7380             (or target-group
7381                 (if (eq gnus-keep-same-level 'best)
7382                     (gnus-summary-best-group gnus-newsgroup-name)
7383                   (gnus-summary-search-group backward gnus-keep-same-level))))
7384       (if (not target-group)
7385           ;; There are no further groups, so we return to the group
7386           ;; buffer.
7387           (progn
7388             (gnus-message 5 "Returning to the group buffer")
7389             (setq entered t)
7390             (when (gnus-buffer-live-p current-buffer)
7391               (set-buffer current-buffer)
7392               (gnus-summary-exit))
7393             (gnus-run-hooks 'gnus-group-no-more-groups-hook))
7394         ;; We try to enter the target group.
7395         (gnus-group-jump-to-group target-group)
7396         (let ((unreads (gnus-group-group-unread)))
7397           (if (and (or (eq t unreads)
7398                        (and unreads (not (zerop unreads))))
7399                    (gnus-summary-read-group
7400                     target-group nil no-article
7401                     (and (buffer-name current-buffer) current-buffer)
7402                     nil backward))
7403               (setq entered t)
7404             (setq current-group target-group
7405                   target-group nil)))))))
7406
7407 (defun gnus-summary-prev-group (&optional no-article)
7408   "Exit current newsgroup and then select previous unread newsgroup.
7409 If prefix argument NO-ARTICLE is non-nil, no article is selected initially."
7410   (interactive "P")
7411   (gnus-summary-next-group no-article nil t))
7412
7413 ;; Walking around summary lines.
7414
7415 (defun gnus-summary-first-subject (&optional unread undownloaded unseen)
7416   "Go to the first subject satisfying any non-nil constraint.
7417 If UNREAD is non-nil, the article should be unread.
7418 If UNDOWNLOADED is non-nil, the article should be undownloaded.
7419 If UNSEEN is non-nil, the article should be unseen.
7420 Returns the article selected or nil if there are no matching articles."
7421   (interactive "P")
7422   (cond
7423    ;; Empty summary.
7424    ((null gnus-newsgroup-data)
7425     (gnus-message 3 "No articles in the group")
7426     nil)
7427    ;; Pick the first article.
7428    ((not (or unread undownloaded unseen))
7429     (goto-char (gnus-data-pos (car gnus-newsgroup-data)))
7430     (gnus-data-number (car gnus-newsgroup-data)))
7431    ;; Find the first unread article.
7432    (t
7433     (let ((data gnus-newsgroup-data))
7434       (while (and data
7435                   (let ((num (gnus-data-number (car data))))
7436                     (or (memq num gnus-newsgroup-unfetched)
7437                         (not (or (and unread
7438                                       (memq num gnus-newsgroup-unreads))
7439                                  (and undownloaded
7440                                       (memq num gnus-newsgroup-undownloaded))
7441                                  (and unseen
7442                                       (memq num gnus-newsgroup-unseen)))))))
7443         (setq data (cdr data)))
7444       (prog1
7445           (if data
7446               (progn
7447                 (goto-char (gnus-data-pos (car data)))
7448                 (gnus-data-number (car data)))
7449             (gnus-message 3 "No more%s articles"
7450                           (let* ((r (when unread " unread"))
7451                                  (d (when undownloaded " undownloaded"))
7452                                  (s (when unseen " unseen"))
7453                                  (l (delq nil (list r d s))))
7454                             (cond ((= 3 (length l))
7455                                    (concat r "," d ", or" s))
7456                                   ((= 2 (length l))
7457                                    (concat (car l) ", or" (cadr l)))
7458                                   ((= 1 (length l))
7459                                    (car l))
7460                                   (t
7461                                    ""))))
7462             nil
7463             )
7464         (gnus-summary-position-point))))))
7465
7466 (defun gnus-summary-next-subject (n &optional unread dont-display)
7467   "Go to next N'th summary line.
7468 If N is negative, go to the previous N'th subject line.
7469 If UNREAD is non-nil, only unread articles are selected.
7470 The difference between N and the actual number of steps taken is
7471 returned."
7472   (interactive "p")
7473   (let ((backward (< n 0))
7474         (n (abs n)))
7475     (while (and (> n 0)
7476                 (if backward
7477                     (gnus-summary-find-prev unread)
7478                   (gnus-summary-find-next unread)))
7479       (unless (zerop (setq n (1- n)))
7480         (gnus-summary-show-thread)))
7481     (when (/= 0 n)
7482       (gnus-message 7 "No more%s articles"
7483                     (if unread " unread" "")))
7484     (unless dont-display
7485       (gnus-summary-recenter)
7486       (gnus-summary-position-point))
7487     n))
7488
7489 (defun gnus-summary-next-unread-subject (n)
7490   "Go to next N'th unread summary line."
7491   (interactive "p")
7492   (gnus-summary-next-subject n t))
7493
7494 (defun gnus-summary-prev-subject (n &optional unread)
7495   "Go to previous N'th summary line.
7496 If optional argument UNREAD is non-nil, only unread article is selected."
7497   (interactive "p")
7498   (gnus-summary-next-subject (- n) unread))
7499
7500 (defun gnus-summary-prev-unread-subject (n)
7501   "Go to previous N'th unread summary line."
7502   (interactive "p")
7503   (gnus-summary-next-subject (- n) t))
7504
7505 (defun gnus-summary-goto-subjects (articles)
7506   "Insert the subject header for ARTICLES in the current buffer."
7507   (save-excursion
7508     (dolist (article articles)
7509       (gnus-summary-goto-subject article t)))
7510   (gnus-summary-limit (append articles gnus-newsgroup-limit))
7511   (gnus-summary-position-point))
7512
7513 (defun gnus-summary-goto-subject (article &optional force silent)
7514   "Go to the subject line of ARTICLE.
7515 If FORCE, also allow jumping to articles not currently shown."
7516   (interactive "nArticle number: ")
7517   (unless (numberp article)
7518     (error "Article %s is not a number" article))
7519   (let ((b (point))
7520         (data (gnus-data-find article)))
7521     ;; We read in the article if we have to.
7522     (and (not data)
7523          force
7524          (gnus-summary-insert-subject
7525           article
7526           (if (or (numberp force) (vectorp force)) force)
7527           t)
7528          (setq data (gnus-data-find article)))
7529     (goto-char b)
7530     (if (not data)
7531         (progn
7532           (unless silent
7533             (gnus-message 3 "Can't find article %d" article))
7534           nil)
7535       (let ((pt (gnus-data-pos data)))
7536         (goto-char pt)
7537         (gnus-summary-set-article-display-arrow pt))
7538       (gnus-summary-position-point)
7539       article)))
7540
7541 ;; Walking around summary lines with displaying articles.
7542
7543 (defun gnus-summary-expand-window (&optional arg)
7544   "Make the summary buffer take up the entire Emacs frame.
7545 Given a prefix, will force an `article' buffer configuration."
7546   (interactive "P")
7547   (if arg
7548       (gnus-configure-windows 'article 'force)
7549     (gnus-configure-windows 'summary 'force)))
7550
7551 (defun gnus-summary-display-article (article &optional all-header)
7552   "Display ARTICLE in article buffer."
7553   (unless (and (gnus-buffer-live-p gnus-article-buffer)
7554                (with-current-buffer gnus-article-buffer
7555                  (eq major-mode 'gnus-article-mode)))
7556     (gnus-article-setup-buffer))
7557   (gnus-set-global-variables)
7558   (with-current-buffer gnus-article-buffer
7559     (setq gnus-article-charset gnus-newsgroup-charset)
7560     (setq gnus-article-ignored-charsets gnus-newsgroup-ignored-charsets)
7561     (mm-enable-multibyte))
7562   (if (null article)
7563       nil
7564     (prog1
7565         (if gnus-summary-display-article-function
7566             (funcall gnus-summary-display-article-function article all-header)
7567           (gnus-article-prepare article all-header))
7568       (gnus-run-hooks 'gnus-select-article-hook)
7569       (when (and gnus-current-article
7570                  (not (zerop gnus-current-article)))
7571         (gnus-summary-goto-subject gnus-current-article))
7572       (gnus-summary-recenter)
7573       (when (and gnus-use-trees gnus-show-threads)
7574         (gnus-possibly-generate-tree article)
7575         (gnus-highlight-selected-tree article))
7576       ;; Successfully display article.
7577       (gnus-article-set-window-start
7578        (cdr (assq article gnus-newsgroup-bookmarks))))))
7579
7580 (defun gnus-summary-select-article (&optional all-headers force pseudo article)
7581   "Select the current article.
7582 If ALL-HEADERS is non-nil, show all header fields.  If FORCE is
7583 non-nil, the article will be re-fetched even if it already present in
7584 the article buffer.  If PSEUDO is non-nil, pseudo-articles will also
7585 be displayed."
7586   ;; Make sure we are in the summary buffer to work around bbdb bug.
7587   (unless (eq major-mode 'gnus-summary-mode)
7588     (set-buffer gnus-summary-buffer))
7589   (let ((article (or article (gnus-summary-article-number)))
7590         (all-headers (not (not all-headers))) ;Must be t or nil.
7591         gnus-summary-display-article-function)
7592     (and (not pseudo)
7593          (gnus-summary-article-pseudo-p article)
7594          (error "This is a pseudo-article"))
7595     (with-current-buffer gnus-summary-buffer
7596       (if (or (and gnus-single-article-buffer
7597                    (or (null gnus-current-article)
7598                        (null gnus-article-current)
7599                        (null (get-buffer gnus-article-buffer))
7600                        (not (eq article (cdr gnus-article-current)))
7601                        (not (equal (car gnus-article-current)
7602                                    gnus-newsgroup-name))))
7603               (and (not gnus-single-article-buffer)
7604                    (or (null gnus-current-article)
7605                        (not (eq gnus-current-article article))))
7606               force)
7607           ;; The requested article is different from the current article.
7608           (progn
7609             (gnus-summary-display-article article all-headers)
7610             (when (gnus-buffer-live-p gnus-article-buffer)
7611               (with-current-buffer gnus-article-buffer
7612                 (if (not gnus-article-decoded-p) ;; a local variable
7613                     (mm-disable-multibyte))))
7614             (gnus-article-set-window-start
7615              (cdr (assq article gnus-newsgroup-bookmarks)))
7616             article)
7617         'old))))
7618
7619 (defun gnus-summary-force-verify-and-decrypt ()
7620   "Display buttons for signed/encrypted parts and verify/decrypt them."
7621   (interactive)
7622   (let ((mm-verify-option 'known)
7623         (mm-decrypt-option 'known)
7624         (gnus-article-emulate-mime t)
7625         (gnus-buttonized-mime-types (append (list "multipart/signed"
7626                                                   "multipart/encrypted")
7627                                             gnus-buttonized-mime-types)))
7628     (gnus-summary-select-article nil 'force)))
7629
7630 (defun gnus-summary-set-current-mark (&optional current-mark)
7631   "Obsolete function."
7632   nil)
7633
7634 (defun gnus-summary-next-article (&optional unread subject backward push)
7635   "Select the next article.
7636 If UNREAD, only unread articles are selected.
7637 If SUBJECT, only articles with SUBJECT are selected.
7638 If BACKWARD, the previous article is selected instead of the next."
7639   (interactive "P")
7640   ;; Make sure we are in the summary buffer.
7641   (unless (eq major-mode 'gnus-summary-mode)
7642     (set-buffer gnus-summary-buffer))
7643   (cond
7644    ;; Is there such an article?
7645    ((and (gnus-summary-search-forward unread subject backward)
7646          (or (gnus-summary-display-article (gnus-summary-article-number))
7647              (eq (gnus-summary-article-mark) gnus-canceled-mark)))
7648     (gnus-summary-position-point))
7649    ;; If not, we try the first unread, if that is wanted.
7650    ((and subject
7651          gnus-auto-select-same
7652          (gnus-summary-first-unread-article))
7653     (gnus-summary-position-point)
7654     (gnus-message 6 "Wrapped"))
7655    ;; Try to get next/previous article not displayed in this group.
7656    ((and gnus-auto-extend-newsgroup
7657          (not unread) (not subject))
7658     (gnus-summary-goto-article
7659      (if backward (1- gnus-newsgroup-begin) (1+ gnus-newsgroup-end))
7660      nil (count-lines (point-min) (point))))
7661    ;; Go to next/previous group.
7662    (t
7663     (unless (gnus-ephemeral-group-p gnus-newsgroup-name)
7664       (gnus-summary-jump-to-group gnus-newsgroup-name))
7665     (let ((cmd (if (featurep 'xemacs)
7666                    last-command-char
7667                  last-command-event))
7668           (point
7669            (with-current-buffer gnus-group-buffer
7670              (point)))
7671           (group
7672            (if (eq gnus-keep-same-level 'best)
7673                (gnus-summary-best-group gnus-newsgroup-name)
7674              (gnus-summary-search-group backward gnus-keep-same-level))))
7675       ;; For some reason, the group window gets selected.  We change
7676       ;; it back.
7677       (select-window (get-buffer-window (current-buffer)))
7678       ;; Select next unread newsgroup automagically.
7679       (cond
7680        ((or (not gnus-auto-select-next)
7681             (not cmd))
7682         (gnus-message 7 "No more%s articles" (if unread " unread" "")))
7683        ((or (eq gnus-auto-select-next 'quietly)
7684             (and (eq gnus-auto-select-next 'slightly-quietly)
7685                  push)
7686             (and (eq gnus-auto-select-next 'almost-quietly)
7687                  (gnus-summary-last-article-p)))
7688         ;; Select quietly.
7689         (if (gnus-ephemeral-group-p gnus-newsgroup-name)
7690             (gnus-summary-exit)
7691           (gnus-message 7 "No more%s articles (%s)..."
7692                         (if unread " unread" "")
7693                         (if group (concat "selecting " group)
7694                           "exiting"))
7695           (gnus-summary-next-group nil group backward)))
7696        (t
7697         (when (gnus-key-press-event-p last-input-event)
7698           (gnus-summary-walk-group-buffer
7699            gnus-newsgroup-name cmd unread backward point))))))))
7700
7701 (defun gnus-summary-walk-group-buffer (from-group cmd unread backward start)
7702   (let ((keystrokes '((?\C-n (gnus-group-next-unread-group 1))
7703                       (?\C-p (gnus-group-prev-unread-group 1))))
7704         (cursor-in-echo-area t)
7705         keve key group ended prompt)
7706     (with-current-buffer gnus-group-buffer
7707       (goto-char start)
7708       (setq group
7709             (if (eq gnus-keep-same-level 'best)
7710                 (gnus-summary-best-group gnus-newsgroup-name)
7711               (gnus-summary-search-group backward gnus-keep-same-level))))
7712     (while (not ended)
7713       (setq prompt
7714             (format
7715              "No more%s articles%s " (if unread " unread" "")
7716              (if (and group
7717                       (not (gnus-ephemeral-group-p gnus-newsgroup-name)))
7718                  (format " (Type %s for %s [%s])"
7719                          (single-key-description cmd)
7720                          (gnus-group-decoded-name group)
7721                          (gnus-group-unread group))
7722                (format " (Type %s to exit %s)"
7723                        (single-key-description cmd)
7724                        (gnus-group-decoded-name gnus-newsgroup-name)))))
7725       ;; Confirm auto selection.
7726       (setq key (car (setq keve (gnus-read-event-char prompt)))
7727             ended t)
7728       (cond
7729        ((assq key keystrokes)
7730         (let ((obuf (current-buffer)))
7731           (switch-to-buffer gnus-group-buffer)
7732           (when group
7733             (gnus-group-jump-to-group group))
7734           (eval (cadr (assq key keystrokes)))
7735           (setq group (gnus-group-group-name))
7736           (switch-to-buffer obuf))
7737         (setq ended nil))
7738        ((equal key cmd)
7739         (if (or (not group)
7740                 (gnus-ephemeral-group-p gnus-newsgroup-name))
7741             (gnus-summary-exit)
7742           (gnus-summary-next-group nil group backward)))
7743        (t
7744         (push (cdr keve) unread-command-events))))))
7745
7746 (defun gnus-summary-next-unread-article ()
7747   "Select unread article after current one."
7748   (interactive)
7749   (gnus-summary-next-article
7750    (or (not (eq gnus-summary-goto-unread 'never))
7751        (gnus-summary-last-article-p (gnus-summary-article-number)))
7752    (and gnus-auto-select-same
7753         (gnus-summary-article-subject))))
7754
7755 (defun gnus-summary-prev-article (&optional unread subject)
7756   "Select the article before the current one.
7757 If UNREAD is non-nil, only unread articles are selected."
7758   (interactive "P")
7759   (gnus-summary-next-article unread subject t))
7760
7761 (defun gnus-summary-prev-unread-article ()
7762   "Select unread article before current one."
7763   (interactive)
7764   (gnus-summary-prev-article
7765    (or (not (eq gnus-summary-goto-unread 'never))
7766        (gnus-summary-first-article-p (gnus-summary-article-number)))
7767    (and gnus-auto-select-same
7768         (gnus-summary-article-subject))))
7769
7770 (defun gnus-summary-next-page (&optional lines circular stop)
7771   "Show next page of the selected article.
7772 If at the end of the current article, select the next article.
7773 LINES says how many lines should be scrolled up.
7774
7775 If CIRCULAR is non-nil, go to the start of the article instead of
7776 selecting the next article when reaching the end of the current
7777 article.
7778
7779 If STOP is non-nil, just stop when reaching the end of the message.
7780
7781 Also see the variable `gnus-article-skip-boring'."
7782   (interactive "P")
7783   (setq gnus-summary-buffer (current-buffer))
7784   (gnus-set-global-variables)
7785   (let ((article (gnus-summary-article-number))
7786         (article-window (get-buffer-window gnus-article-buffer t))
7787         endp)
7788     ;; If the buffer is empty, we have no article.
7789     (unless article
7790       (error "No article to select"))
7791     (gnus-configure-windows 'article)
7792     (if (eq (cdr (assq article gnus-newsgroup-reads)) gnus-canceled-mark)
7793         (if (and (eq gnus-summary-goto-unread 'never)
7794                  (not (gnus-summary-last-article-p article)))
7795             (gnus-summary-next-article)
7796           (gnus-summary-next-unread-article))
7797       (if (or (null gnus-current-article)
7798               (null gnus-article-current)
7799               (/= article (cdr gnus-article-current))
7800               (not (equal (car gnus-article-current) gnus-newsgroup-name)))
7801           ;; Selected subject is different from current article's.
7802           (gnus-summary-display-article article)
7803         (when article-window
7804           (gnus-eval-in-buffer-window gnus-article-buffer
7805             (setq endp (or (gnus-article-next-page lines)
7806                            (gnus-article-only-boring-p))))
7807           (when endp
7808             (cond (stop
7809                    (gnus-message 3 "End of message"))
7810                   (circular
7811                    (gnus-summary-beginning-of-article))
7812                   (lines
7813                    (gnus-message 3 "End of message"))
7814                   ((null lines)
7815                    (if (and (eq gnus-summary-goto-unread 'never)
7816                             (not (gnus-summary-last-article-p article)))
7817                        (gnus-summary-next-article)
7818                      (gnus-summary-next-unread-article))))))))
7819     (gnus-summary-recenter)
7820     (gnus-summary-position-point)))
7821
7822 (defun gnus-summary-prev-page (&optional lines move)
7823   "Show previous page of selected article.
7824 Argument LINES specifies lines to be scrolled down.
7825 If MOVE, move to the previous unread article if point is at
7826 the beginning of the buffer."
7827   (interactive "P")
7828   (let ((article (gnus-summary-article-number))
7829         (article-window (get-buffer-window gnus-article-buffer t))
7830         endp)
7831     (gnus-configure-windows 'article)
7832     (if (or (null gnus-current-article)
7833             (null gnus-article-current)
7834             (/= article (cdr gnus-article-current))
7835             (not (equal (car gnus-article-current) gnus-newsgroup-name)))
7836         ;; Selected subject is different from current article's.
7837         (gnus-summary-display-article article)
7838       (gnus-summary-recenter)
7839       (when article-window
7840         (gnus-eval-in-buffer-window gnus-article-buffer
7841           (setq endp (gnus-article-prev-page lines)))
7842         (when (and move endp)
7843           (cond (lines
7844                  (gnus-message 3 "Beginning of message"))
7845                 ((null lines)
7846                  (if (and (eq gnus-summary-goto-unread 'never)
7847                           (not (gnus-summary-first-article-p article)))
7848                      (gnus-summary-prev-article)
7849                    (gnus-summary-prev-unread-article))))))))
7850   (gnus-summary-position-point))
7851
7852 (defun gnus-summary-prev-page-or-article (&optional lines)
7853   "Show previous page of selected article.
7854 Argument LINES specifies lines to be scrolled down.
7855 If at the beginning of the article, go to the next article."
7856   (interactive "P")
7857   (gnus-summary-prev-page lines t))
7858
7859 (defun gnus-summary-scroll-up (lines)
7860   "Scroll up (or down) one line current article.
7861 Argument LINES specifies lines to be scrolled up (or down if negative)."
7862   (interactive "p")
7863   (gnus-configure-windows 'article)
7864   (gnus-summary-show-thread)
7865   (when (eq (gnus-summary-select-article nil nil 'pseudo) 'old)
7866     (gnus-eval-in-buffer-window gnus-article-buffer
7867       (cond ((> lines 0)
7868              (when (gnus-article-next-page lines)
7869                (gnus-message 3 "End of message")))
7870             ((< lines 0)
7871              (gnus-article-prev-page (- lines))))))
7872   (gnus-summary-recenter)
7873   (gnus-summary-position-point))
7874
7875 (defun gnus-summary-scroll-down (lines)
7876   "Scroll down (or up) one line current article.
7877 Argument LINES specifies lines to be scrolled down (or up if negative)."
7878   (interactive "p")
7879   (gnus-summary-scroll-up (- lines)))
7880
7881 (defun gnus-summary-next-same-subject ()
7882   "Select next article which has the same subject as current one."
7883   (interactive)
7884   (gnus-summary-next-article nil (gnus-summary-article-subject)))
7885
7886 (defun gnus-summary-prev-same-subject ()
7887   "Select previous article which has the same subject as current one."
7888   (interactive)
7889   (gnus-summary-prev-article nil (gnus-summary-article-subject)))
7890
7891 (defun gnus-summary-next-unread-same-subject ()
7892   "Select next unread article which has the same subject as current one."
7893   (interactive)
7894   (gnus-summary-next-article t (gnus-summary-article-subject)))
7895
7896 (defun gnus-summary-prev-unread-same-subject ()
7897   "Select previous unread article which has the same subject as current one."
7898   (interactive)
7899   (gnus-summary-prev-article t (gnus-summary-article-subject)))
7900
7901 (defun gnus-summary-first-unread-article ()
7902   "Select the first unread article.
7903 Return nil if there are no unread articles."
7904   (interactive)
7905   (prog1
7906       (when (gnus-summary-first-subject t)
7907         (gnus-summary-show-thread)
7908         (gnus-summary-first-subject t)
7909         (gnus-summary-display-article (gnus-summary-article-number)))
7910     (gnus-summary-position-point)))
7911
7912 (defun gnus-summary-first-unread-subject ()
7913   "Place the point on the subject line of the first unread article.
7914 Return nil if there are no unread articles."
7915   (interactive)
7916   (prog1
7917       (when (gnus-summary-first-subject t)
7918         (gnus-summary-show-thread)
7919         (gnus-summary-first-subject t))
7920     (gnus-summary-position-point)))
7921
7922 (defun gnus-summary-first-unseen-subject ()
7923   "Place the point on the subject line of the first unseen article.
7924 Return nil if there are no unseen articles."
7925   (interactive)
7926   (prog1
7927       (when (gnus-summary-first-subject nil nil t)
7928         (gnus-summary-show-thread)
7929         (gnus-summary-first-subject nil nil t))
7930     (gnus-summary-position-point)))
7931
7932 (defun gnus-summary-first-unseen-or-unread-subject ()
7933   "Place the point on the subject line of the first unseen article or,
7934 if all article have been seen, on the subject line of the first unread
7935 article."
7936   (interactive)
7937   (prog1
7938       (unless (when (gnus-summary-first-subject nil nil t)
7939                 (gnus-summary-show-thread)
7940                 (gnus-summary-first-subject nil nil t))
7941         (when (gnus-summary-first-subject t)
7942           (gnus-summary-show-thread)
7943           (gnus-summary-first-subject t)))
7944     (gnus-summary-position-point)))
7945
7946 (defun gnus-summary-first-article ()
7947   "Select the first article.
7948 Return nil if there are no articles."
7949   (interactive)
7950   (prog1
7951       (when (gnus-summary-first-subject)
7952         (gnus-summary-show-thread)
7953         (gnus-summary-first-subject)
7954         (gnus-summary-display-article (gnus-summary-article-number)))
7955     (gnus-summary-position-point)))
7956
7957 (defun gnus-summary-best-unread-article (&optional arg)
7958   "Select the unread article with the highest score.
7959 If given a prefix argument, select the next unread article that has a
7960 score higher than the default score."
7961   (interactive "P")
7962   (let ((article (if arg
7963                      (gnus-summary-better-unread-subject)
7964                    (gnus-summary-best-unread-subject))))
7965     (if article
7966         (gnus-summary-goto-article article)
7967       (error "No unread articles"))))
7968
7969 (defun gnus-summary-best-unread-subject ()
7970   "Select the unread subject with the highest score."
7971   (interactive)
7972   (let ((best -1000000)
7973         (data gnus-newsgroup-data)
7974         article score)
7975     (while data
7976       (and (gnus-data-unread-p (car data))
7977            (> (setq score
7978                     (gnus-summary-article-score (gnus-data-number (car data))))
7979               best)
7980            (setq best score
7981                  article (gnus-data-number (car data))))
7982       (setq data (cdr data)))
7983     (when article
7984       (gnus-summary-goto-subject article))
7985     (gnus-summary-position-point)
7986     article))
7987
7988 (defun gnus-summary-better-unread-subject ()
7989   "Select the first unread subject that has a score over the default score."
7990   (interactive)
7991   (let ((data gnus-newsgroup-data)
7992         article score)
7993     (while (and (setq article (gnus-data-number (car data)))
7994                 (or (gnus-data-read-p (car data))
7995                     (not (> (gnus-summary-article-score article)
7996                             gnus-summary-default-score))))
7997       (setq data (cdr data)))
7998     (when article
7999       (gnus-summary-goto-subject article))
8000     (gnus-summary-position-point)
8001     article))
8002
8003 (defun gnus-summary-last-subject ()
8004   "Go to the last displayed subject line in the group."
8005   (let ((article (gnus-data-number (car (gnus-data-list t)))))
8006     (when article
8007       (gnus-summary-goto-subject article))))
8008
8009 (defun gnus-summary-goto-article (article &optional all-headers force)
8010   "Fetch ARTICLE (article number or Message-ID) and display it if it exists.
8011 If ALL-HEADERS is non-nil, no header lines are hidden.
8012 If FORCE, go to the article even if it isn't displayed.  If FORCE
8013 is a number, it is the line the article is to be displayed on."
8014   (interactive
8015    (list
8016     (completing-read
8017      "Article number or Message-ID: "
8018      (mapcar (lambda (number) (list (int-to-string number)))
8019              gnus-newsgroup-limit))
8020     current-prefix-arg
8021     t))
8022   (prog1
8023       (if (and (stringp article)
8024                (string-match "@\\|%40" article))
8025           (gnus-summary-refer-article article)
8026         (when (stringp article)
8027           (setq article (string-to-number article)))
8028         (if (gnus-summary-goto-subject article force)
8029             (gnus-summary-display-article article all-headers)
8030           (gnus-message 4 "Couldn't go to article %s" article) nil))
8031     (gnus-summary-position-point)))
8032
8033 (defun gnus-summary-goto-last-article ()
8034   "Go to the previously read article."
8035   (interactive)
8036   (prog1
8037       (when gnus-last-article
8038         (gnus-summary-goto-article gnus-last-article nil t))
8039     (gnus-summary-position-point)))
8040
8041 (defun gnus-summary-pop-article (number)
8042   "Pop one article off the history and go to the previous.
8043 NUMBER articles will be popped off."
8044   (interactive "p")
8045   (let (to)
8046     (setq gnus-newsgroup-history
8047           (cdr (setq to (nthcdr number gnus-newsgroup-history))))
8048     (if to
8049         (gnus-summary-goto-article (car to) nil t)
8050       (error "Article history empty")))
8051   (gnus-summary-position-point))
8052
8053 ;; Summary commands and functions for limiting the summary buffer.
8054
8055 (defun gnus-summary-limit-to-articles (n)
8056   "Limit the summary buffer to the next N articles.
8057 If not given a prefix, use the process marked articles instead."
8058   (interactive "P")
8059   (prog1
8060       (let ((articles (gnus-summary-work-articles n)))
8061         (setq gnus-newsgroup-processable nil)
8062         (gnus-summary-limit articles))
8063     (gnus-summary-position-point)))
8064
8065 (defun gnus-summary-pop-limit (&optional total)
8066   "Restore the previous limit.
8067 If given a prefix, remove all limits."
8068   (interactive "P")
8069   (when total
8070     (setq gnus-newsgroup-limits
8071           (list (mapcar (lambda (h) (mail-header-number h))
8072                         gnus-newsgroup-headers))))
8073   (unless gnus-newsgroup-limits
8074     (error "No limit to pop"))
8075   (prog1
8076       (gnus-summary-limit nil 'pop)
8077     (gnus-summary-position-point)))
8078
8079 (defun gnus-summary-limit-to-subject (subject &optional header not-matching)
8080   "Limit the summary buffer to articles that have subjects that match a regexp.
8081 If NOT-MATCHING, excluding articles that have subjects that match a regexp."
8082   (interactive
8083    (list (read-string (if current-prefix-arg
8084                           "Exclude subject (regexp): "
8085                         "Limit to subject (regexp): "))
8086          nil current-prefix-arg))
8087   (unless header
8088     (setq header "subject"))
8089   (when (not (equal "" subject))
8090     (prog1
8091         (let ((articles (gnus-summary-find-matching
8092                          (or header "subject") subject 'all nil nil
8093                          not-matching)))
8094           (unless articles
8095             (error "Found no matches for \"%s\"" subject))
8096           (gnus-summary-limit articles))
8097       (gnus-summary-position-point))))
8098
8099 (defun gnus-summary-limit-to-author (from &optional not-matching)
8100   "Limit the summary buffer to articles that have authors that match a regexp.
8101 If NOT-MATCHING, excluding articles that have authors that match a regexp."
8102   (interactive
8103    (list (read-string (if current-prefix-arg
8104                           "Exclude author (regexp): "
8105                         "Limit to author (regexp): "))
8106          current-prefix-arg))
8107   (gnus-summary-limit-to-subject from "from" not-matching))
8108
8109 (defun gnus-summary-limit-to-recipient (recipient &optional not-matching)
8110   "Limit the summary buffer to articles with the given RECIPIENT.
8111
8112 If NOT-MATCHING, exclude RECIPIENT.
8113
8114 To and Cc headers are checked.  You need to include them in
8115 `nnmail-extra-headers'."
8116   ;; Unlike `rmail-summary-by-recipients', doesn't include From.
8117   (interactive
8118    (list (read-string (format "%s recipient (regexp): "
8119                               (if current-prefix-arg "Exclude" "Limit to")))
8120          current-prefix-arg))
8121   (when (not (equal "" recipient))
8122     (prog1 (let* ((to
8123                    (if (memq 'To nnmail-extra-headers)
8124                        (gnus-summary-find-matching
8125                         (cons 'extra 'To) recipient 'all nil nil
8126                         not-matching)
8127                      (gnus-message
8128                       1 "`To' isn't present in `nnmail-extra-headers'")
8129                      (sit-for 1)
8130                      nil))
8131                   (cc
8132                    (if (memq 'Cc nnmail-extra-headers)
8133                        (gnus-summary-find-matching
8134                         (cons 'extra 'Cc) recipient 'all nil nil
8135                         not-matching)
8136                      (gnus-message
8137                       1 "`Cc' isn't present in `nnmail-extra-headers'")
8138                      (sit-for 1)
8139                      nil))
8140                   (articles
8141                    (if not-matching
8142                        ;; We need the numbers that are in both lists:
8143                        (mapcar (lambda (a)
8144                                  (and (memq a to) a))
8145                                cc)
8146                      (nconc to cc))))
8147              (unless articles
8148                (error "Found no matches for \"%s\"" recipient))
8149              (gnus-summary-limit articles))
8150       (gnus-summary-position-point))))
8151
8152 (defun gnus-summary-limit-to-address (address &optional not-matching)
8153   "Limit the summary buffer to articles with the given ADDRESS.
8154
8155 If NOT-MATCHING, exclude ADDRESS.
8156
8157 To, Cc and From headers are checked.  You need to include `To' and `Cc'
8158 in `nnmail-extra-headers'."
8159   (interactive
8160    (list (read-string (format "%s address (regexp): "
8161                               (if current-prefix-arg "Exclude" "Limit to")))
8162          current-prefix-arg))
8163   (when (not (equal "" address))
8164     (prog1 (let* ((to
8165                    (if (memq 'To nnmail-extra-headers)
8166                        (gnus-summary-find-matching
8167                         (cons 'extra 'To) address 'all nil nil
8168                         not-matching)
8169                      (gnus-message
8170                       1 "`To' isn't present in `nnmail-extra-headers'")
8171                      (sit-for 1)
8172                      t))
8173                   (cc
8174                    (if (memq 'Cc nnmail-extra-headers)
8175                        (gnus-summary-find-matching
8176                         (cons 'extra 'Cc) address 'all nil nil
8177                         not-matching)
8178                      (gnus-message
8179                       1 "`Cc' isn't present in `nnmail-extra-headers'")
8180                      (sit-for 1)
8181                      t))
8182                   (from
8183                    (gnus-summary-find-matching "from" address
8184                                                'all nil nil not-matching))
8185                   (articles
8186                    (if not-matching
8187                        ;; We need the numbers that are in all lists:
8188                        (if (eq cc t)
8189                            (if (eq to t)
8190                                from
8191                              (mapcar (lambda (a) (car (memq a from))) to))
8192                          (if (eq to t)
8193                              (mapcar (lambda (a) (car (memq a from))) cc)
8194                            (mapcar (lambda (a) (car (memq a from)))
8195                                    (mapcar (lambda (a) (car (memq a to)))
8196                                            cc))))
8197                      (nconc (if (eq to t) nil to)
8198                             (if (eq cc t) nil cc)
8199                             from))))
8200              (unless articles
8201                (error "Found no matches for \"%s\"" address))
8202              (gnus-summary-limit articles))
8203       (gnus-summary-position-point))))
8204
8205 (defun gnus-summary-limit-strange-charsets-predicate (header)
8206   (let ((string (concat (mail-header-subject header)
8207                         (mail-header-from header)))
8208         charset found)
8209     (dotimes (i (1- (length string)))
8210       (setq charset (format "%s" (char-charset (aref string (1+ i)))))
8211       (when (string-match "unicode\\|big\\|japanese" charset)
8212         (setq found t)))
8213     found))
8214
8215 (defun gnus-summary-limit-to-predicate (predicate)
8216   "Limit to articles where PREDICATE returns non-nil.
8217 PREDICATE will be called with the header structures of the
8218 articles."
8219   (let ((articles nil)
8220         (case-fold-search t))
8221     (dolist (header gnus-newsgroup-headers)
8222       (when (funcall predicate header)
8223         (push (mail-header-number header) articles)))
8224     (gnus-summary-limit (nreverse articles))))
8225
8226 (defun gnus-summary-limit-to-age (age &optional younger-p)
8227   "Limit the summary buffer to articles that are older than (or equal) AGE days.
8228 If YOUNGER-P (the prefix) is non-nil, limit the summary buffer to
8229 articles that are younger than AGE days."
8230   (interactive
8231    (let ((younger current-prefix-arg)
8232          (days-got nil)
8233          days)
8234      (while (not days-got)
8235        (setq days (if younger
8236                       (read-string "Limit to articles younger than (in days, older when negative): ")
8237                     (read-string
8238                      "Limit to articles older than (in days, younger when negative): ")))
8239        (when (> (length days) 0)
8240          (setq days (read days)))
8241        (if (numberp days)
8242            (progn
8243              (setq days-got t)
8244              (when (< days 0)
8245                (setq younger (not younger))
8246                (setq days (* days -1))))
8247          (message "Please enter a number.")
8248          (sleep-for 1)))
8249      (list days younger)))
8250   (prog1
8251       (let ((data gnus-newsgroup-data)
8252             (cutoff (days-to-time age))
8253             articles d date is-younger)
8254         (while (setq d (pop data))
8255           (when (and (vectorp (gnus-data-header d))
8256                      (setq date (mail-header-date (gnus-data-header d))))
8257             (setq is-younger (time-less-p
8258                               (time-since (condition-case ()
8259                                               (date-to-time date)
8260                                             (error '(0 0))))
8261                               cutoff))
8262             (when (if younger-p
8263                       is-younger
8264                     (not is-younger))
8265               (push (gnus-data-number d) articles))))
8266         (gnus-summary-limit (nreverse articles)))
8267     (gnus-summary-position-point)))
8268
8269 (defun gnus-summary-limit-to-extra (header regexp &optional not-matching)
8270   "Limit the summary buffer to articles that match an 'extra' header."
8271   (interactive
8272    (let ((header
8273           (intern
8274            (gnus-completing-read-with-default
8275             (symbol-name (car gnus-extra-headers))
8276             (if current-prefix-arg
8277                 "Exclude extra header"
8278               "Limit extra header")
8279             (mapcar (lambda (x)
8280                       (cons (symbol-name x) x))
8281                     gnus-extra-headers)
8282             nil
8283             t))))
8284      (list header
8285            (read-string (format "%s header %s (regexp): "
8286                                 (if current-prefix-arg "Exclude" "Limit to")
8287                                 header))
8288            current-prefix-arg)))
8289   (when (not (equal "" regexp))
8290     (prog1
8291         (let ((articles (gnus-summary-find-matching
8292                          (cons 'extra header) regexp 'all nil nil
8293                          not-matching)))
8294           (unless articles
8295             (error "Found no matches for \"%s\"" regexp))
8296           (gnus-summary-limit articles))
8297       (gnus-summary-position-point))))
8298
8299 (defun gnus-summary-limit-to-display-predicate ()
8300   "Limit the summary buffer to the predicated in the `display' group parameter."
8301   (interactive)
8302   (unless gnus-newsgroup-display
8303     (error "There is no `display' group parameter"))
8304   (let (articles)
8305     (dolist (number gnus-newsgroup-articles)
8306       (when (funcall gnus-newsgroup-display)
8307         (push number articles)))
8308     (gnus-summary-limit articles))
8309   (gnus-summary-position-point))
8310
8311 (defalias 'gnus-summary-delete-marked-as-read 'gnus-summary-limit-to-unread)
8312 (make-obsolete
8313  'gnus-summary-delete-marked-as-read 'gnus-summary-limit-to-unread "Emacs 20.4")
8314
8315 (defun gnus-summary-limit-to-unread (&optional all)
8316   "Limit the summary buffer to articles that are not marked as read.
8317 If ALL is non-nil, limit strictly to unread articles."
8318   (interactive "P")
8319   (if all
8320       (gnus-summary-limit-to-marks (char-to-string gnus-unread-mark))
8321     (gnus-summary-limit-to-marks
8322      ;; Concat all the marks that say that an article is read and have
8323      ;; those removed.
8324      (list gnus-del-mark gnus-read-mark gnus-ancient-mark
8325            gnus-killed-mark gnus-spam-mark gnus-kill-file-mark
8326            gnus-low-score-mark gnus-expirable-mark
8327            gnus-canceled-mark gnus-catchup-mark gnus-sparse-mark
8328            gnus-duplicate-mark gnus-souped-mark)
8329      'reverse)))
8330
8331 (defun gnus-summary-limit-to-headers (match &optional reverse)
8332   "Limit the summary buffer to articles that have headers that match MATCH.
8333 If REVERSE (the prefix), limit to articles that don't match."
8334   (interactive "sMatch headers (regexp): \nP")
8335   (gnus-summary-limit-to-bodies match reverse t))
8336
8337 (defun gnus-summary-limit-to-bodies (match &optional reverse headersp)
8338   "Limit the summary buffer to articles that have bodies that match MATCH.
8339 If REVERSE (the prefix), limit to articles that don't match."
8340   (interactive "sMatch body (regexp): \nP")
8341   (let ((articles nil)
8342         (gnus-select-article-hook nil)  ;Disable hook.
8343         (gnus-article-prepare-hook nil)
8344         (gnus-use-article-prefetch nil)
8345         (gnus-keep-backlog nil)
8346         (gnus-break-pages nil)
8347         (gnus-summary-display-arrow nil)
8348         (gnus-updated-mode-lines nil)
8349         (gnus-auto-center-summary nil)
8350         (gnus-display-mime-function nil))
8351     (dolist (data gnus-newsgroup-data)
8352       (let (gnus-mark-article-hook)
8353         (gnus-summary-select-article t t nil (gnus-data-number data)))
8354       (save-excursion
8355         (set-buffer gnus-article-buffer)
8356         (article-goto-body)
8357         (let* ((case-fold-search t)
8358                (found (if headersp
8359                           (re-search-backward match nil t)
8360                         (re-search-forward match nil t))))
8361           (when (or (and found
8362                          (not reverse))
8363                     (and (not found)
8364                          reverse))
8365             (push (gnus-data-number data) articles)))))
8366     (if (not articles)
8367         (message "No messages matched")
8368       (gnus-summary-limit articles)))
8369   (gnus-summary-position-point))
8370
8371 (defun gnus-summary-limit-to-singletons (&optional threadsp)
8372   "Limit the summary buffer to articles that aren't part on any thread.
8373 If THREADSP (the prefix), limit to articles that are in threads."
8374   (interactive "P")
8375   (let ((articles nil)
8376         thread-articles
8377         threads)
8378     (dolist (thread gnus-newsgroup-threads)
8379       (if (stringp (car thread))
8380           (dolist (thread (cdr thread))
8381             (push thread threads))
8382         (push thread threads)))
8383     (dolist (thread threads)
8384       (setq thread-articles (gnus-articles-in-thread thread))
8385       (when (or (and threadsp
8386                      (> (length thread-articles) 1))
8387                 (and (not threadsp)
8388                      (= (length thread-articles) 1)))
8389         (setq articles (nconc thread-articles articles))))
8390     (if (not articles)
8391         (message "No messages matched")
8392       (gnus-summary-limit articles))
8393     (gnus-summary-position-point)))
8394
8395 (defun gnus-summary-limit-to-replied (&optional unreplied)
8396   "Limit the summary buffer to replied articles.
8397 If UNREPLIED (the prefix), limit to unreplied articles."
8398   (interactive "P")
8399   (if unreplied
8400       (gnus-summary-limit
8401        (gnus-set-difference gnus-newsgroup-articles
8402         gnus-newsgroup-replied))
8403     (gnus-summary-limit gnus-newsgroup-replied))
8404   (gnus-summary-position-point))
8405
8406 (defalias 'gnus-summary-delete-marked-with 'gnus-summary-limit-exclude-marks)
8407 (make-obsolete 'gnus-summary-delete-marked-with
8408                'gnus-summary-limit-exclude-marks "Emacs 20.4")
8409
8410 (defun gnus-summary-limit-exclude-marks (marks &optional reverse)
8411   "Exclude articles that are marked with MARKS (e.g. \"DK\").
8412 If REVERSE, limit the summary buffer to articles that are marked
8413 with MARKS.  MARKS can either be a string of marks or a list of marks.
8414 Returns how many articles were removed."
8415   (interactive "sMarks: ")
8416   (gnus-summary-limit-to-marks marks t))
8417
8418 (defun gnus-summary-limit-to-marks (marks &optional reverse)
8419   "Limit the summary buffer to articles that are marked with MARKS (e.g. \"DK\").
8420 If REVERSE (the prefix), limit the summary buffer to articles that are
8421 not marked with MARKS.  MARKS can either be a string of marks or a
8422 list of marks.
8423 Returns how many articles were removed."
8424   (interactive "sMarks: \nP")
8425   (prog1
8426       (let ((data gnus-newsgroup-data)
8427             (marks (if (listp marks) marks
8428                      (append marks nil))) ; Transform to list.
8429             articles)
8430         (while data
8431           (when (if reverse (not (memq (gnus-data-mark (car data)) marks))
8432                   (memq (gnus-data-mark (car data)) marks))
8433             (push (gnus-data-number (car data)) articles))
8434           (setq data (cdr data)))
8435         (gnus-summary-limit articles))
8436     (gnus-summary-position-point)))
8437
8438 (defun gnus-summary-limit-to-score (score)
8439   "Limit to articles with score at or above SCORE."
8440   (interactive "NLimit to articles with score of at least: ")
8441   (let ((data gnus-newsgroup-data)
8442         articles)
8443     (while data
8444       (when (>= (gnus-summary-article-score (gnus-data-number (car data)))
8445                 score)
8446         (push (gnus-data-number (car data)) articles))
8447       (setq data (cdr data)))
8448     (prog1
8449         (gnus-summary-limit articles)
8450       (gnus-summary-position-point))))
8451
8452 (defun gnus-summary-limit-to-unseen ()
8453   "Limit to unseen articles."
8454   (interactive)
8455   (prog1
8456       (gnus-summary-limit gnus-newsgroup-unseen)
8457     (gnus-summary-position-point)))
8458
8459 (defun gnus-summary-limit-include-thread (id)
8460   "Display all the hidden articles that is in the thread with ID in it.
8461 When called interactively, ID is the Message-ID of the current
8462 article."
8463   (interactive (list (mail-header-id (gnus-summary-article-header))))
8464   (let ((articles (gnus-articles-in-thread
8465                    (gnus-id-to-thread (gnus-root-id id)))))
8466     (prog1
8467         (gnus-summary-limit (nconc articles gnus-newsgroup-limit))
8468       (gnus-summary-limit-include-matching-articles
8469        "subject"
8470        (regexp-quote (gnus-simplify-subject-re
8471                       (mail-header-subject (gnus-id-to-header id)))))
8472       (gnus-summary-position-point))))
8473
8474 (defun gnus-summary-limit-include-matching-articles (header regexp)
8475   "Display all the hidden articles that have HEADERs that match REGEXP."
8476   (interactive (list (read-string "Match on header: ")
8477                      (read-string "Regexp: ")))
8478   (let ((articles (gnus-find-matching-articles header regexp)))
8479     (prog1
8480         (gnus-summary-limit (nconc articles gnus-newsgroup-limit))
8481       (gnus-summary-position-point))))
8482
8483 (defun gnus-summary-insert-dormant-articles ()
8484   "Insert all the dormant articles for this group into the current buffer."
8485   (interactive)
8486   (let ((gnus-verbose (max 6 gnus-verbose)))
8487     (if (not gnus-newsgroup-dormant)
8488         (gnus-message 3 "No dormant articles for this group")
8489       (gnus-summary-goto-subjects gnus-newsgroup-dormant))))
8490
8491 (defun gnus-summary-insert-ticked-articles ()
8492   "Insert ticked articles for this group into the current buffer."
8493   (interactive)
8494   (let ((gnus-verbose (max 6 gnus-verbose)))
8495     (if (not gnus-newsgroup-marked)
8496         (gnus-message 3 "No ticked articles for this group")
8497       (gnus-summary-goto-subjects gnus-newsgroup-marked))))
8498
8499 (defun gnus-summary-limit-include-dormant ()
8500   "Display all the hidden articles that are marked as dormant.
8501 Note that this command only works on a subset of the articles currently
8502 fetched for this group."
8503   (interactive)
8504   (unless gnus-newsgroup-dormant
8505     (error "There are no dormant articles in this group"))
8506   (prog1
8507       (gnus-summary-limit (append gnus-newsgroup-dormant gnus-newsgroup-limit))
8508     (gnus-summary-position-point)))
8509
8510 (defun gnus-summary-limit-exclude-dormant ()
8511   "Hide all dormant articles."
8512   (interactive)
8513   (prog1
8514       (gnus-summary-limit-to-marks (list gnus-dormant-mark) 'reverse)
8515     (gnus-summary-position-point)))
8516
8517 (defun gnus-summary-limit-exclude-childless-dormant ()
8518   "Hide all dormant articles that have no children."
8519   (interactive)
8520   (let ((data (gnus-data-list t))
8521         articles d children)
8522     ;; Find all articles that are either not dormant or have
8523     ;; children.
8524     (while (setq d (pop data))
8525       (when (or (not (= (gnus-data-mark d) gnus-dormant-mark))
8526                 (and (setq children
8527                            (gnus-article-children (gnus-data-number d)))
8528                      (let (found)
8529                        (while children
8530                          (when (memq (car children) articles)
8531                            (setq children nil
8532                                  found t))
8533                          (pop children))
8534                        found)))
8535         (push (gnus-data-number d) articles)))
8536     ;; Do the limiting.
8537     (prog1
8538         (gnus-summary-limit articles)
8539       (gnus-summary-position-point))))
8540
8541 (defun gnus-summary-limit-mark-excluded-as-read (&optional all)
8542   "Mark all unread excluded articles as read.
8543 If ALL, mark even excluded ticked and dormants as read."
8544   (interactive "P")
8545   (setq gnus-newsgroup-limit (sort gnus-newsgroup-limit '<))
8546   (let ((articles (gnus-sorted-ndifference
8547                    (sort
8548                     (mapcar (lambda (h) (mail-header-number h))
8549                             gnus-newsgroup-headers)
8550                     '<)
8551                    gnus-newsgroup-limit))
8552         article)
8553     (setq gnus-newsgroup-unreads
8554           (gnus-sorted-intersection gnus-newsgroup-unreads
8555                                     gnus-newsgroup-limit))
8556     (if all
8557         (setq gnus-newsgroup-dormant nil
8558               gnus-newsgroup-marked nil
8559               gnus-newsgroup-reads
8560               (nconc
8561                (mapcar (lambda (n) (cons n gnus-catchup-mark)) articles)
8562                gnus-newsgroup-reads))
8563       (while (setq article (pop articles))
8564         (unless (or (memq article gnus-newsgroup-dormant)
8565                     (memq article gnus-newsgroup-marked))
8566           (push (cons article gnus-catchup-mark) gnus-newsgroup-reads))))))
8567
8568 (defun gnus-summary-limit (articles &optional pop)
8569   (if pop
8570       ;; We pop the previous limit off the stack and use that.
8571       (setq articles (car gnus-newsgroup-limits)
8572             gnus-newsgroup-limits (cdr gnus-newsgroup-limits))
8573     ;; We use the new limit, so we push the old limit on the stack.
8574     (push gnus-newsgroup-limit gnus-newsgroup-limits))
8575   ;; Set the limit.
8576   (setq gnus-newsgroup-limit articles)
8577   (let ((total (length gnus-newsgroup-data))
8578         (data (gnus-data-find-list (gnus-summary-article-number)))
8579         (gnus-summary-mark-below nil)   ; Inhibit this.
8580         found)
8581     ;; This will do all the work of generating the new summary buffer
8582     ;; according to the new limit.
8583     (gnus-summary-prepare)
8584     ;; Hide any threads, possibly.
8585     (gnus-summary-maybe-hide-threads)
8586     ;; Try to return to the article you were at, or one in the
8587     ;; neighborhood.
8588     (when data
8589       ;; We try to find some article after the current one.
8590       (while data
8591         (when (gnus-summary-goto-subject (gnus-data-number (car data)) nil t)
8592           (setq data nil
8593                 found t))
8594         (setq data (cdr data))))
8595     (unless found
8596       ;; If there is no data, that means that we were after the last
8597       ;; article.  The same goes when we can't find any articles
8598       ;; after the current one.
8599       (goto-char (point-max))
8600       (gnus-summary-find-prev))
8601     (gnus-set-mode-line 'summary)
8602     ;; We return how many articles were removed from the summary
8603     ;; buffer as a result of the new limit.
8604     (- total (length gnus-newsgroup-data))))
8605
8606 (defsubst gnus-invisible-cut-children (threads)
8607   (let ((num 0))
8608     (while threads
8609       (when (memq (mail-header-number (caar threads)) gnus-newsgroup-limit)
8610         (incf num))
8611       (pop threads))
8612     (< num 2)))
8613
8614 (defsubst gnus-cut-thread (thread)
8615   "Go forwards in the thread until we find an article that we want to display."
8616   (when (or (eq gnus-fetch-old-headers 'some)
8617             (eq gnus-fetch-old-headers 'invisible)
8618             (numberp gnus-fetch-old-headers)
8619             (eq gnus-build-sparse-threads 'some)
8620             (eq gnus-build-sparse-threads 'more))
8621     ;; Deal with old-fetched headers and sparse threads.
8622     (while (and
8623             thread
8624             (or
8625              (gnus-summary-article-sparse-p (mail-header-number (car thread)))
8626              (gnus-summary-article-ancient-p
8627               (mail-header-number (car thread))))
8628             (if (or (<= (length (cdr thread)) 1)
8629                     (eq gnus-fetch-old-headers 'invisible))
8630                 (setq gnus-newsgroup-limit
8631                       (delq (mail-header-number (car thread))
8632                             gnus-newsgroup-limit)
8633                       thread (cadr thread))
8634               (when (gnus-invisible-cut-children (cdr thread))
8635                 (let ((th (cdr thread)))
8636                   (while th
8637                     (if (memq (mail-header-number (caar th))
8638                               gnus-newsgroup-limit)
8639                         (setq thread (car th)
8640                               th nil)
8641                       (setq th (cdr th))))))))))
8642   thread)
8643
8644 (defun gnus-cut-threads (threads)
8645   "Cut off all uninteresting articles from the beginning of THREADS."
8646   (when (or (eq gnus-fetch-old-headers 'some)
8647             (eq gnus-fetch-old-headers 'invisible)
8648             (numberp gnus-fetch-old-headers)
8649             (eq gnus-build-sparse-threads 'some)
8650             (eq gnus-build-sparse-threads 'more))
8651     (let ((th threads))
8652       (while th
8653         (setcar th (gnus-cut-thread (car th)))
8654         (setq th (cdr th)))))
8655   ;; Remove nixed out threads.
8656   (delq nil threads))
8657
8658 (defun gnus-summary-initial-limit (&optional show-if-empty)
8659   "Figure out what the initial limit is supposed to be on group entry.
8660 This entails weeding out unwanted dormants, low-scored articles,
8661 fetch-old-headers verbiage, and so on."
8662   ;; Most groups have nothing to remove.
8663   (unless (or gnus-inhibit-limiting
8664               (and (null gnus-newsgroup-dormant)
8665                    (eq gnus-newsgroup-display 'gnus-not-ignore)
8666                    (not (eq gnus-fetch-old-headers 'some))
8667                    (not (numberp gnus-fetch-old-headers))
8668                    (not (eq gnus-fetch-old-headers 'invisible))
8669                    (null gnus-summary-expunge-below)
8670                    (not (eq gnus-build-sparse-threads 'some))
8671                    (not (eq gnus-build-sparse-threads 'more))
8672                    (null gnus-thread-expunge-below)
8673                    (not gnus-use-nocem)))
8674     (push gnus-newsgroup-limit gnus-newsgroup-limits)
8675     (setq gnus-newsgroup-limit nil)
8676     (mapatoms
8677      (lambda (node)
8678        (unless (car (symbol-value node))
8679          ;; These threads have no parents -- they are roots.
8680          (let ((nodes (cdr (symbol-value node)))
8681                thread)
8682            (while nodes
8683              (if (and gnus-thread-expunge-below
8684                       (< (gnus-thread-total-score (car nodes))
8685                          gnus-thread-expunge-below))
8686                  (gnus-expunge-thread (pop nodes))
8687                (setq thread (pop nodes))
8688                (gnus-summary-limit-children thread))))))
8689      gnus-newsgroup-dependencies)
8690     ;; If this limitation resulted in an empty group, we might
8691     ;; pop the previous limit and use it instead.
8692     (when (and (not gnus-newsgroup-limit)
8693                show-if-empty)
8694       (setq gnus-newsgroup-limit (pop gnus-newsgroup-limits)))
8695     gnus-newsgroup-limit))
8696
8697 (defun gnus-summary-limit-children (thread)
8698   "Return 1 if this subthread is visible and 0 if it is not."
8699   ;; First we get the number of visible children to this thread.  This
8700   ;; is done by recursing down the thread using this function, so this
8701   ;; will really go down to a leaf article first, before slowly
8702   ;; working its way up towards the root.
8703   (when thread
8704     (let* ((max-lisp-eval-depth (max 5000 max-lisp-eval-depth))
8705            (children
8706            (if (cdr thread)
8707                (apply '+ (mapcar 'gnus-summary-limit-children
8708                                  (cdr thread)))
8709              0))
8710           (number (mail-header-number (car thread)))
8711           score)
8712       (if (and
8713            (not (memq number gnus-newsgroup-marked))
8714            (or
8715             ;; If this article is dormant and has absolutely no visible
8716             ;; children, then this article isn't visible.
8717             (and (memq number gnus-newsgroup-dormant)
8718                  (zerop children))
8719             ;; If this is "fetch-old-headered" and there is no
8720             ;; visible children, then we don't want this article.
8721             (and (or (eq gnus-fetch-old-headers 'some)
8722                      (numberp gnus-fetch-old-headers))
8723                  (gnus-summary-article-ancient-p number)
8724                  (zerop children))
8725             ;; If this is "fetch-old-headered" and `invisible', then
8726             ;; we don't want this article.
8727             (and (eq gnus-fetch-old-headers 'invisible)
8728                  (gnus-summary-article-ancient-p number))
8729             ;; If this is a sparsely inserted article with no children,
8730             ;; we don't want it.
8731             (and (eq gnus-build-sparse-threads 'some)
8732                  (gnus-summary-article-sparse-p number)
8733                  (zerop children))
8734             ;; If we use expunging, and this article is really
8735             ;; low-scored, then we don't want this article.
8736             (when (and gnus-summary-expunge-below
8737                        (< (setq score
8738                                 (or (cdr (assq number gnus-newsgroup-scored))
8739                                     gnus-summary-default-score))
8740                           gnus-summary-expunge-below))
8741               ;; We increase the expunge-tally here, but that has
8742               ;; nothing to do with the limits, really.
8743               (incf gnus-newsgroup-expunged-tally)
8744               ;; We also mark as read here, if that's wanted.
8745               (when (and gnus-summary-mark-below
8746                          (< score gnus-summary-mark-below))
8747                 (setq gnus-newsgroup-unreads
8748                       (delq number gnus-newsgroup-unreads))
8749                 (if gnus-newsgroup-auto-expire
8750                     (push number gnus-newsgroup-expirable)
8751                   (push (cons number gnus-low-score-mark)
8752                         gnus-newsgroup-reads)))
8753               t)
8754             ;; Do the `display' group parameter.
8755             (and gnus-newsgroup-display
8756                  (not (funcall gnus-newsgroup-display)))
8757             ;; Check NoCeM things.
8758             (when (and gnus-use-nocem
8759                        (gnus-nocem-unwanted-article-p
8760                         (mail-header-id (car thread))))
8761               (setq gnus-newsgroup-unreads
8762                     (delq number gnus-newsgroup-unreads))
8763               t)))
8764           ;; Nope, invisible article.
8765           0
8766         ;; Ok, this article is to be visible, so we add it to the limit
8767         ;; and return 1.
8768         (push number gnus-newsgroup-limit)
8769         1))))
8770
8771 (defun gnus-expunge-thread (thread)
8772   "Mark all articles in THREAD as read."
8773   (let* ((number (mail-header-number (car thread))))
8774     (incf gnus-newsgroup-expunged-tally)
8775     ;; We also mark as read here, if that's wanted.
8776     (setq gnus-newsgroup-unreads
8777           (delq number gnus-newsgroup-unreads))
8778     (if gnus-newsgroup-auto-expire
8779         (push number gnus-newsgroup-expirable)
8780       (push (cons number gnus-low-score-mark)
8781             gnus-newsgroup-reads)))
8782   ;; Go recursively through all subthreads.
8783   (mapcar 'gnus-expunge-thread (cdr thread)))
8784
8785 ;; Summary article oriented commands
8786
8787 (defun gnus-summary-refer-parent-article (n)
8788   "Refer parent article N times.
8789 If N is negative, go to ancestor -N instead.
8790 The difference between N and the number of articles fetched is returned."
8791   (interactive "p")
8792   (let ((skip 1)
8793         error header ref)
8794     (when (not (natnump n))
8795       (setq skip (abs n)
8796             n 1))
8797     (while (and (> n 0)
8798                 (not error))
8799       (setq header (gnus-summary-article-header))
8800       (if (and (eq (mail-header-number header)
8801                    (cdr gnus-article-current))
8802                (equal gnus-newsgroup-name
8803                       (car gnus-article-current)))
8804           ;; If we try to find the parent of the currently
8805           ;; displayed article, then we take a look at the actual
8806           ;; References header, since this is slightly more
8807           ;; reliable than the References field we got from the
8808           ;; server.
8809           (with-current-buffer gnus-original-article-buffer
8810             (nnheader-narrow-to-headers)
8811             (unless (setq ref (message-fetch-field "references"))
8812               (when (setq ref (message-fetch-field "in-reply-to"))
8813                 (setq ref (gnus-extract-message-id-from-in-reply-to ref))))
8814             (widen))
8815         (setq ref
8816               ;; It's not the current article, so we take a bet on
8817               ;; the value we got from the server.
8818               (mail-header-references header)))
8819       (if (and ref
8820                (not (equal ref "")))
8821           (unless (gnus-summary-refer-article (gnus-parent-id ref skip))
8822             (gnus-message 1 "Couldn't find parent"))
8823         (gnus-message 1 "No references in article %d"
8824                       (gnus-summary-article-number))
8825         (setq error t))
8826       (decf n))
8827     (gnus-summary-position-point)
8828     n))
8829
8830 (defun gnus-summary-refer-references ()
8831   "Fetch all articles mentioned in the References header.
8832 Return the number of articles fetched."
8833   (interactive)
8834   (let ((ref (mail-header-references (gnus-summary-article-header)))
8835         (current (gnus-summary-article-number))
8836         (n 0))
8837     (if (or (not ref)
8838             (equal ref ""))
8839         (error "No References in the current article")
8840       ;; For each Message-ID in the References header...
8841       (while (string-match "<[^>]*>" ref)
8842         (incf n)
8843         ;; ... fetch that article.
8844         (gnus-summary-refer-article
8845          (prog1 (match-string 0 ref)
8846            (setq ref (substring ref (match-end 0))))))
8847       (gnus-summary-goto-subject current)
8848       (gnus-summary-position-point)
8849       n)))
8850
8851 (defun gnus-summary-refer-thread (&optional limit)
8852   "Fetch all articles in the current thread.
8853 If LIMIT (the numerical prefix), fetch that many old headers instead
8854 of what's specified by the `gnus-refer-thread-limit' variable."
8855   (interactive "P")
8856   (let ((id (mail-header-id (gnus-summary-article-header)))
8857         (limit (if limit (prefix-numeric-value limit)
8858                  gnus-refer-thread-limit)))
8859     (unless (eq gnus-fetch-old-headers 'invisible)
8860       (gnus-message 5 "Fetching headers for %s..." gnus-newsgroup-name)
8861       ;; Retrieve the headers and read them in.
8862       (if (eq (if (numberp limit)
8863                   (gnus-retrieve-headers
8864                    (list (min
8865                           (+ (mail-header-number
8866                               (gnus-summary-article-header))
8867                              limit)
8868                           gnus-newsgroup-end))
8869                    gnus-newsgroup-name (* limit 2))
8870                 ;; gnus-refer-thread-limit is t, i.e. fetch _all_
8871                 ;; headers.
8872                 (gnus-retrieve-headers (list gnus-newsgroup-end)
8873                                        gnus-newsgroup-name limit))
8874               'nov)
8875           (gnus-build-all-threads)
8876         (error "Can't fetch thread from back ends that don't support NOV"))
8877       (gnus-message 5 "Fetching headers for %s...done" gnus-newsgroup-name))
8878     (gnus-summary-limit-include-thread id)))
8879
8880 (defun gnus-summary-refer-article (message-id)
8881   "Fetch an article specified by MESSAGE-ID."
8882   (interactive "sMessage-ID: ")
8883   (when (and (stringp message-id)
8884              (not (zerop (length message-id))))
8885     (setq message-id (gnus-replace-in-string message-id " " ""))
8886     ;; Construct the correct Message-ID if necessary.
8887     ;; Suggested by tale@pawl.rpi.edu.
8888     (unless (string-match "^<" message-id)
8889       (setq message-id (concat "<" message-id)))
8890     (unless (string-match ">$" message-id)
8891       (setq message-id (concat message-id ">")))
8892     ;; People often post MIDs from URLs, so unhex it:
8893     (unless (string-match "@" message-id)
8894       (setq message-id (gnus-url-unhex-string message-id)))
8895     (let* ((header (gnus-id-to-header message-id))
8896            (sparse (and header
8897                         (gnus-summary-article-sparse-p
8898                          (mail-header-number header))
8899                         (memq (mail-header-number header)
8900                               gnus-newsgroup-limit)))
8901            number)
8902       (cond
8903        ;; If the article is present in the buffer we just go to it.
8904        ((and header
8905              (or (not (gnus-summary-article-sparse-p
8906                        (mail-header-number header)))
8907                  sparse))
8908         (prog1
8909             (gnus-summary-goto-article
8910              (mail-header-number header) nil t)
8911           (when sparse
8912             (gnus-summary-update-article (mail-header-number header)))))
8913        (t
8914         ;; We fetch the article.
8915         (catch 'found
8916           (dolist (gnus-override-method (gnus-refer-article-methods))
8917             (when (and (gnus-check-server gnus-override-method)
8918                        ;; Fetch the header,
8919                        (setq number (gnus-summary-insert-subject message-id)))
8920               ;; and display the article.
8921               (gnus-summary-select-article nil nil nil number)
8922               (throw 'found t)))
8923           (gnus-message 3 "Couldn't fetch article %s" message-id)))))))
8924
8925 (defun gnus-refer-article-methods ()
8926   "Return a list of referable methods."
8927   (cond
8928    ;; No method, so we default to current and native.
8929    ((null gnus-refer-article-method)
8930     (list gnus-current-select-method gnus-select-method))
8931    ;; Current.
8932    ((eq 'current gnus-refer-article-method)
8933     (list gnus-current-select-method))
8934    ;; List of select methods.
8935    ((not (and (symbolp (car gnus-refer-article-method))
8936               (assq (car gnus-refer-article-method) nnoo-definition-alist)))
8937     (let (out)
8938       (dolist (method gnus-refer-article-method)
8939         (push (if (eq 'current method)
8940                   gnus-current-select-method
8941                 method)
8942               out))
8943       (nreverse out)))
8944    ;; One single select method.
8945    (t
8946     (list gnus-refer-article-method))))
8947
8948 (defun gnus-summary-edit-parameters ()
8949   "Edit the group parameters of the current group."
8950   (interactive)
8951   (gnus-group-edit-group gnus-newsgroup-name 'params))
8952
8953 (defun gnus-summary-customize-parameters ()
8954   "Customize the group parameters of the current group."
8955   (interactive)
8956   (gnus-group-customize gnus-newsgroup-name))
8957
8958 (defun gnus-summary-enter-digest-group (&optional force)
8959   "Enter an nndoc group based on the current article.
8960 If FORCE, force a digest interpretation.  If not, try
8961 to guess what the document format is."
8962   (interactive "P")
8963   (let ((conf gnus-current-window-configuration))
8964     (save-window-excursion
8965       (save-excursion
8966         (let (gnus-article-prepare-hook
8967               gnus-display-mime-function
8968               gnus-break-pages)
8969           (gnus-summary-select-article))))
8970     (setq gnus-current-window-configuration conf)
8971     (let* ((name (format "%s-%d"
8972                          (gnus-group-prefixed-name
8973                           gnus-newsgroup-name (list 'nndoc ""))
8974                          (with-current-buffer gnus-summary-buffer
8975                            gnus-current-article)))
8976            (ogroup gnus-newsgroup-name)
8977            (params (append (gnus-info-params (gnus-get-info ogroup))
8978                            (list (cons 'to-group ogroup))
8979                            (list (cons 'parent-group ogroup))
8980                            (list (cons 'save-article-group ogroup))))
8981            (case-fold-search t)
8982            (buf (current-buffer))
8983            dig to-address)
8984       (with-current-buffer gnus-original-article-buffer
8985         ;; Have the digest group inherit the main mail address of
8986         ;; the parent article.
8987         (when (setq to-address (or (gnus-fetch-field "reply-to")
8988                                    (gnus-fetch-field "from")))
8989           (setq params
8990                 (append
8991                  (list (cons 'to-address
8992                              (funcall gnus-decode-encoded-address-function
8993                                       to-address))))))
8994         (setq dig (nnheader-set-temp-buffer " *gnus digest buffer*"))
8995         (insert-buffer-substring gnus-original-article-buffer)
8996         ;; Remove lines that may lead nndoc to misinterpret the
8997         ;; document type.
8998         (narrow-to-region
8999          (goto-char (point-min))
9000          (or (search-forward "\n\n" nil t) (point)))
9001         (goto-char (point-min))
9002         (delete-matching-lines "^Path:\\|^From ")
9003         (widen))
9004       (unwind-protect
9005           (if (let ((gnus-newsgroup-ephemeral-charset gnus-newsgroup-charset)
9006                     (gnus-newsgroup-ephemeral-ignored-charsets
9007                      gnus-newsgroup-ignored-charsets))
9008                 (gnus-group-read-ephemeral-group
9009                  name `(nndoc ,name (nndoc-address ,(get-buffer dig))
9010                               (nndoc-article-type
9011                                ,(if force 'mbox 'guess)))
9012                  t nil nil nil
9013                  `((adapt-file . ,(gnus-score-file-name gnus-newsgroup-name
9014                                                         "ADAPT")))))
9015               ;; Make all postings to this group go to the parent group.
9016               (nconc (gnus-info-params (gnus-get-info name))
9017                      params)
9018             ;; Couldn't select this doc group.
9019             (switch-to-buffer buf)
9020             (gnus-set-global-variables)
9021             (gnus-configure-windows 'summary)
9022             (gnus-message 3 "Article couldn't be entered?"))
9023         (kill-buffer dig)))))
9024
9025 (defun gnus-summary-read-document (n)
9026   "Open a new group based on the current article(s).
9027 This will allow you to read digests and other similar
9028 documents as newsgroups.
9029 Obeys the standard process/prefix convention."
9030   (interactive "P")
9031   (let* ((ogroup gnus-newsgroup-name)
9032          (params (append (gnus-info-params (gnus-get-info ogroup))
9033                          (list (cons 'to-group ogroup))))
9034          group egroup groups vgroup)
9035     (dolist (article (gnus-summary-work-articles n))
9036       (setq group (format "%s-%d" gnus-newsgroup-name article))
9037       (gnus-summary-remove-process-mark article)
9038       (when (gnus-summary-display-article article)
9039         (save-excursion
9040           (with-temp-buffer
9041             (insert-buffer-substring gnus-original-article-buffer)
9042             ;; Remove some headers that may lead nndoc to make
9043             ;; the wrong guess.
9044             (message-narrow-to-head)
9045             (goto-char (point-min))
9046             (delete-matching-lines "^Path:\\|^From ")
9047             (widen)
9048             (if (setq egroup
9049                       (gnus-group-read-ephemeral-group
9050                        group `(nndoc ,group (nndoc-address ,(current-buffer))
9051                                      (nndoc-article-type guess))
9052                        t nil t))
9053                 (progn
9054                   ;; Make all postings to this group go to the parent group.
9055                   (nconc (gnus-info-params (gnus-get-info egroup))
9056                          params)
9057                   (push egroup groups))
9058               ;; Couldn't select this doc group.
9059               (gnus-error 3 "Article couldn't be entered"))))))
9060     ;; Now we have selected all the documents.
9061     (cond
9062      ((not groups)
9063       (error "None of the articles could be interpreted as documents"))
9064      ((gnus-group-read-ephemeral-group
9065        (setq vgroup (format
9066                      "nnvirtual:%s-%s" gnus-newsgroup-name
9067                      (format-time-string "%Y%m%dT%H%M%S" (current-time))))
9068        `(nnvirtual ,vgroup (nnvirtual-component-groups ,groups))
9069        t
9070        (cons (current-buffer) 'summary)))
9071      (t
9072       (error "Couldn't select virtual nndoc group")))))
9073
9074 (defun gnus-summary-isearch-article (&optional regexp-p)
9075   "Do incremental search forward on the current article.
9076 If REGEXP-P (the prefix) is non-nil, do regexp isearch."
9077   (interactive "P")
9078   (gnus-summary-select-article)
9079   (gnus-configure-windows 'article)
9080   (gnus-eval-in-buffer-window gnus-article-buffer
9081     (save-restriction
9082       (widen)
9083       (isearch-forward regexp-p))))
9084
9085 (defun gnus-summary-repeat-search-article-forward ()
9086   "Repeat the previous search forwards."
9087   (interactive)
9088   (unless gnus-last-search-regexp
9089     (error "No previous search"))
9090   (gnus-summary-search-article-forward gnus-last-search-regexp))
9091
9092 (defun gnus-summary-repeat-search-article-backward ()
9093   "Repeat the previous search backwards."
9094   (interactive)
9095   (unless gnus-last-search-regexp
9096     (error "No previous search"))
9097   (gnus-summary-search-article-forward gnus-last-search-regexp t))
9098
9099 (defun gnus-summary-search-article-forward (regexp &optional backward)
9100   "Search for an article containing REGEXP forward.
9101 If BACKWARD, search backward instead."
9102   (interactive
9103    (list (read-string
9104           (format "Search article %s (regexp%s): "
9105                   (if current-prefix-arg "backward" "forward")
9106                   (if gnus-last-search-regexp
9107                       (concat ", default " gnus-last-search-regexp)
9108                     "")))
9109          current-prefix-arg))
9110   (if (string-equal regexp "")
9111       (setq regexp (or gnus-last-search-regexp ""))
9112     (setq gnus-last-search-regexp regexp)
9113     (setq gnus-article-before-search gnus-current-article))
9114   ;; Intentionally set gnus-last-article.
9115   (setq gnus-last-article gnus-article-before-search)
9116   (let ((gnus-last-article gnus-last-article))
9117     (if (gnus-summary-search-article regexp backward)
9118         (gnus-summary-show-thread)
9119       (signal 'search-failed (list regexp)))))
9120
9121 (defun gnus-summary-search-article-backward (regexp)
9122   "Search for an article containing REGEXP backward."
9123   (interactive
9124    (list (read-string
9125           (format "Search article backward (regexp%s): "
9126                   (if gnus-last-search-regexp
9127                       (concat ", default " gnus-last-search-regexp)
9128                     "")))))
9129   (gnus-summary-search-article-forward regexp 'backward))
9130
9131 (defun gnus-summary-search-article (regexp &optional backward)
9132   "Search for an article containing REGEXP.
9133 Optional argument BACKWARD means do search for backward.
9134 `gnus-select-article-hook' is not called during the search."
9135   ;; We have to require this here to make sure that the following
9136   ;; dynamic binding isn't shadowed by autoloading.
9137   (require 'gnus-async)
9138   (require 'gnus-art)
9139   (let ((gnus-select-article-hook nil)  ;Disable hook.
9140         (gnus-article-prepare-hook nil)
9141         (gnus-mark-article-hook nil)    ;Inhibit marking as read.
9142         (gnus-use-article-prefetch nil)
9143         (gnus-xmas-force-redisplay nil) ;Inhibit XEmacs redisplay.
9144         (gnus-use-trees nil)            ;Inhibit updating tree buffer.
9145         (gnus-visual nil)
9146         (gnus-keep-backlog nil)
9147         (gnus-break-pages nil)
9148         (gnus-summary-display-arrow nil)
9149         (gnus-updated-mode-lines nil)
9150         (gnus-auto-center-summary nil)
9151         (sum (current-buffer))
9152         (gnus-display-mime-function nil)
9153         (found nil)
9154         point)
9155     (gnus-save-hidden-threads
9156       (gnus-summary-select-article)
9157       (set-buffer gnus-article-buffer)
9158       (goto-char (window-point (get-buffer-window (current-buffer))))
9159       (when backward
9160         (forward-line -1))
9161       (while (not found)
9162         (gnus-message 7 "Searching article: %d..." (cdr gnus-article-current))
9163         (if (if backward
9164                 (re-search-backward regexp nil t)
9165               (re-search-forward regexp nil t))
9166             ;; We found the regexp.
9167             (progn
9168               (setq found 'found)
9169               (beginning-of-line)
9170               (set-window-start
9171                (get-buffer-window (current-buffer))
9172                (point))
9173               (forward-line 1)
9174               (set-window-point
9175                (get-buffer-window (current-buffer))
9176                (point))
9177               (set-buffer sum)
9178               (setq point (point)))
9179           ;; We didn't find it, so we go to the next article.
9180           (set-buffer sum)
9181           (setq found 'not)
9182           (while (eq found 'not)
9183             (if (not (if backward (gnus-summary-find-prev)
9184                        (gnus-summary-find-next)))
9185                 ;; No more articles.
9186                 (setq found t)
9187               ;; Select the next article and adjust point.
9188               (unless (gnus-summary-article-sparse-p
9189                        (gnus-summary-article-number))
9190                 (setq found nil)
9191                 (gnus-summary-select-article)
9192                 (set-buffer gnus-article-buffer)
9193                 (widen)
9194                 (goto-char (if backward (point-max) (point-min))))))))
9195       (gnus-message 7 ""))
9196     ;; Return whether we found the regexp.
9197     (when (eq found 'found)
9198       (goto-char point)
9199       (gnus-summary-show-thread)
9200       (gnus-summary-goto-subject gnus-current-article)
9201       (gnus-summary-position-point)
9202       t)))
9203
9204 (defun gnus-find-matching-articles (header regexp)
9205   "Return a list of all articles that match REGEXP on HEADER.
9206 This search includes all articles in the current group that Gnus has
9207 fetched headers for, whether they are displayed or not."
9208   (let ((articles nil)
9209         ;; Can't eta-reduce because it's a macro.
9210         (func `(lambda (h) (,(intern (concat "mail-header-" header)) h)))
9211         (case-fold-search t))
9212     (dolist (header gnus-newsgroup-headers)
9213       (when (string-match regexp (funcall func header))
9214         (push (mail-header-number header) articles)))
9215     (nreverse articles)))
9216
9217 (defun gnus-summary-find-matching (header regexp &optional backward unread
9218                                           not-case-fold not-matching)
9219   "Return a list of all articles that match REGEXP on HEADER.
9220 The search stars on the current article and goes forwards unless
9221 BACKWARD is non-nil.  If BACKWARD is `all', do all articles.
9222 If UNREAD is non-nil, only unread articles will
9223 be taken into consideration.  If NOT-CASE-FOLD, case won't be folded
9224 in the comparisons. If NOT-MATCHING, return a list of all articles that
9225 not match REGEXP on HEADER."
9226   (let ((case-fold-search (not not-case-fold))
9227         articles d func)
9228     (if (consp header)
9229         (if (eq (car header) 'extra)
9230             (setq func
9231                   `(lambda (h)
9232                      (or (cdr (assq ',(cdr header) (mail-header-extra h)))
9233                          "")))
9234           (error "%s is an invalid header" header))
9235       (unless (fboundp (intern (concat "mail-header-" header)))
9236         (error "%s is not a valid header" header))
9237       (setq func `(lambda (h) (,(intern (concat "mail-header-" header)) h))))
9238     (dolist (d (if (eq backward 'all)
9239                    gnus-newsgroup-data
9240                  (gnus-data-find-list
9241                   (gnus-summary-article-number)
9242                   (gnus-data-list backward))))
9243       (when (and (or (not unread)       ; We want all articles...
9244                      (gnus-data-unread-p d)) ; Or just unreads.
9245                  (vectorp (gnus-data-header d)) ; It's not a pseudo.
9246                  (if not-matching
9247                      (not (string-match
9248                            regexp
9249                            (funcall func (gnus-data-header d))))
9250                    (string-match regexp
9251                                  (funcall func (gnus-data-header d)))))
9252         (push (gnus-data-number d) articles))) ; Success!
9253     (nreverse articles)))
9254
9255 (defun gnus-summary-execute-command (header regexp command &optional backward)
9256   "Search forward for an article whose HEADER matches REGEXP and execute COMMAND.
9257 If HEADER is an empty string (or nil), the match is done on the entire
9258 article.  If BACKWARD (the prefix) is non-nil, search backward instead."
9259   (interactive
9260    (list (let ((completion-ignore-case t))
9261            (completing-read
9262             "Header name: "
9263             (mapcar (lambda (header) (list (format "%s" header)))
9264                     (append
9265                      '("Number" "Subject" "From" "Lines" "Date"
9266                        "Message-ID" "Xref" "References" "Body")
9267                      gnus-extra-headers))
9268             nil 'require-match))
9269          (read-string "Regexp: ")
9270          (read-key-sequence "Command: ")
9271          current-prefix-arg))
9272   (when (equal header "Body")
9273     (setq header ""))
9274   ;; Hidden thread subtrees must be searched as well.
9275   (gnus-summary-show-all-threads)
9276   ;; We don't want to change current point nor window configuration.
9277   (save-excursion
9278     (save-window-excursion
9279       (let (gnus-visual
9280             gnus-treat-strip-trailing-blank-lines
9281             gnus-treat-strip-leading-blank-lines
9282             gnus-treat-strip-multiple-blank-lines
9283             gnus-treat-hide-boring-headers
9284             gnus-treat-fold-newsgroups
9285             gnus-article-prepare-hook)
9286         (gnus-message 6 "Executing %s..." (key-description command))
9287         ;; We'd like to execute COMMAND interactively so as to give arguments.
9288         (gnus-execute header regexp
9289                       `(call-interactively ',(key-binding command))
9290                       backward)
9291         (gnus-message 6 "Executing %s...done" (key-description command))))))
9292
9293 (defun gnus-summary-beginning-of-article ()
9294   "Scroll the article back to the beginning."
9295   (interactive)
9296   (gnus-summary-select-article)
9297   (gnus-configure-windows 'article)
9298   (gnus-eval-in-buffer-window gnus-article-buffer
9299     (widen)
9300     (goto-char (point-min))
9301     (when gnus-break-pages
9302       (gnus-narrow-to-page))))
9303
9304 (defun gnus-summary-end-of-article ()
9305   "Scroll to the end of the article."
9306   (interactive)
9307   (gnus-summary-select-article)
9308   (gnus-configure-windows 'article)
9309   (gnus-eval-in-buffer-window gnus-article-buffer
9310     (widen)
9311     (goto-char (point-max))
9312     (recenter -3)
9313     (when gnus-break-pages
9314       (gnus-narrow-to-page))))
9315
9316 (defun gnus-summary-print-truncate-and-quote (string &optional len)
9317   "Truncate to LEN and quote all \"(\"'s in STRING."
9318   (gnus-replace-in-string (if (and len (> (length string) len))
9319                               (substring string 0 len)
9320                             string)
9321                           "[()]" "\\\\\\&"))
9322
9323 (defun gnus-summary-print-article (&optional filename n)
9324   "Generate and print a PostScript image of the process-marked (mail) articles.
9325
9326 If used interactively, print the current article if none are
9327 process-marked.  With prefix arg, prompt the user for the name of the
9328 file to save in.
9329
9330 When used from Lisp, accept two optional args FILENAME and N.  N means
9331 to print the next N articles.  If N is negative, print the N previous
9332 articles.  If N is nil and articles have been marked with the process
9333 mark, print these instead.
9334
9335 If the optional first argument FILENAME is nil, send the image to the
9336 printer.  If FILENAME is a string, save the PostScript image in a file with
9337 that name.  If FILENAME is a number, prompt the user for the name of the file
9338 to save in."
9339   (interactive (list (ps-print-preprint current-prefix-arg)))
9340   (dolist (article (gnus-summary-work-articles n))
9341     (gnus-summary-select-article nil nil 'pseudo article)
9342     (gnus-eval-in-buffer-window gnus-article-buffer
9343       (gnus-print-buffer))
9344     (gnus-summary-remove-process-mark article))
9345   (ps-despool filename))
9346
9347 (defun gnus-print-buffer ()
9348   (let ((buffer (generate-new-buffer " *print*")))
9349     (unwind-protect
9350         (progn
9351           (copy-to-buffer buffer (point-min) (point-max))
9352           (set-buffer buffer)
9353           (gnus-remove-text-with-property 'gnus-decoration)
9354           (when (gnus-visual-p 'article-highlight 'highlight)
9355             ;; Copy-to-buffer doesn't copy overlay.  So redo
9356             ;; highlight.
9357             (let ((gnus-article-buffer buffer))
9358               (gnus-article-highlight-citation t)
9359               (gnus-article-highlight-signature)
9360               (gnus-article-emphasize)
9361               (gnus-article-delete-invisible-text)))
9362           (let ((ps-left-header
9363                  (list
9364                   (concat "("
9365                           (gnus-summary-print-truncate-and-quote
9366                            (mail-header-subject gnus-current-headers)
9367                            66) ")")
9368                   (concat "("
9369                           (gnus-summary-print-truncate-and-quote
9370                            (mail-header-from gnus-current-headers)
9371                            45) ")")))
9372                 (ps-right-header
9373                  (list
9374                   "/pagenumberstring load"
9375                   (concat "("
9376                           (mail-header-date gnus-current-headers) ")"))))
9377             (gnus-run-hooks 'gnus-ps-print-hook)
9378             (save-excursion
9379               (if ps-print-color-p
9380                   (ps-spool-buffer-with-faces)
9381                 (ps-spool-buffer)))))
9382       (kill-buffer buffer))))
9383
9384 (defun gnus-summary-show-article (&optional arg)
9385   "Force redisplaying of the current article.
9386 If ARG (the prefix) is a number, show the article with the charset
9387 defined in `gnus-summary-show-article-charset-alist', or the charset
9388 input.
9389 If ARG (the prefix) is non-nil and not a number, show the raw article
9390 without any article massaging functions being run.  Normally, the key
9391 strokes are `C-u g'."
9392   (interactive "P")
9393   (cond
9394    ((numberp arg)
9395     (gnus-summary-show-article t)
9396     (let ((gnus-newsgroup-charset
9397            (or (cdr (assq arg gnus-summary-show-article-charset-alist))
9398                (mm-read-coding-system
9399                 "View as charset: " ;; actually it is coding system.
9400                 (with-current-buffer gnus-article-buffer
9401                   (mm-detect-coding-region (point) (point-max))))))
9402           (gnus-newsgroup-ignored-charsets 'gnus-all))
9403       (gnus-summary-select-article nil 'force)
9404       (let ((deps gnus-newsgroup-dependencies)
9405             head header lines)
9406         (with-current-buffer gnus-original-article-buffer
9407           (save-restriction
9408             (message-narrow-to-head)
9409             (setq head (buffer-string))
9410             (goto-char (point-min))
9411             (unless (re-search-forward "^lines:[ \t]\\([0-9]+\\)" nil t)
9412               (goto-char (point-max))
9413               (widen)
9414               (setq lines (1- (count-lines (point) (point-max))))))
9415           (with-temp-buffer
9416             (insert (format "211 %d Article retrieved.\n"
9417                             (cdr gnus-article-current)))
9418             (insert head)
9419             (if lines (insert (format "Lines: %d\n" lines)))
9420             (insert ".\n")
9421             (let ((nntp-server-buffer (current-buffer)))
9422               (setq header (car (gnus-get-newsgroup-headers deps t))))))
9423         (gnus-data-set-header
9424          (gnus-data-find (cdr gnus-article-current))
9425          header)
9426         (gnus-summary-update-article-line
9427          (cdr gnus-article-current) header)
9428         (when (gnus-summary-goto-subject (cdr gnus-article-current) nil t)
9429           (gnus-summary-update-secondary-mark (cdr gnus-article-current))))))
9430    ((not arg)
9431     ;; Select the article the normal way.
9432     (gnus-summary-select-article nil 'force))
9433    (t
9434     ;; We have to require this here to make sure that the following
9435     ;; dynamic binding isn't shadowed by autoloading.
9436     (require 'gnus-async)
9437     (require 'gnus-art)
9438     ;; Bind the article treatment functions to nil.
9439     (let ((gnus-have-all-headers t)
9440           gnus-article-prepare-hook
9441           gnus-article-decode-hook
9442           gnus-display-mime-function
9443           gnus-break-pages)
9444       ;; Destroy any MIME parts.
9445       (when (gnus-buffer-live-p gnus-article-buffer)
9446         (with-current-buffer gnus-article-buffer
9447           (mm-destroy-parts gnus-article-mime-handles)
9448           ;; Set it to nil for safety reason.
9449           (setq gnus-article-mime-handle-alist nil)
9450           (setq gnus-article-mime-handles nil)))
9451       (gnus-summary-select-article nil 'force))))
9452   (gnus-summary-goto-subject gnus-current-article)
9453   (gnus-summary-position-point))
9454
9455 (defun gnus-summary-show-raw-article ()
9456   "Show the raw article without any article massaging functions being run."
9457   (interactive)
9458   (gnus-summary-show-article t))
9459
9460 (defun gnus-summary-verbose-headers (&optional arg)
9461   "Toggle permanent full header display.
9462 If ARG is a positive number, turn header display on.
9463 If ARG is a negative number, turn header display off."
9464   (interactive "P")
9465   (setq gnus-show-all-headers
9466         (cond ((or (not (numberp arg))
9467                    (zerop arg))
9468                (not gnus-show-all-headers))
9469               ((natnump arg)
9470                t)))
9471   (gnus-summary-show-article))
9472
9473 (defun gnus-summary-toggle-header (&optional arg)
9474   "Show the headers if they are hidden, or hide them if they are shown.
9475 If ARG is a positive number, show the entire header.
9476 If ARG is a negative number, hide the unwanted header lines."
9477   (interactive "P")
9478   (let ((window (and (gnus-buffer-live-p gnus-article-buffer)
9479                      (get-buffer-window gnus-article-buffer t))))
9480     (with-current-buffer gnus-article-buffer
9481       (widen)
9482       (article-narrow-to-head)
9483       (let* ((inhibit-read-only t)
9484              (inhibit-point-motion-hooks t)
9485              (hidden (if (numberp arg)
9486                          (>= arg 0)
9487                        (or (not (looking-at "[^ \t\n]+:"))
9488                            (gnus-article-hidden-text-p 'headers))))
9489              s e)
9490         (delete-region (point-min) (point-max))
9491         (with-current-buffer gnus-original-article-buffer
9492           (goto-char (setq s (point-min)))
9493           (setq e (if (search-forward "\n\n" nil t)
9494                       (1- (point))
9495                     (point-max))))
9496         (insert-buffer-substring gnus-original-article-buffer s e)
9497         (run-hooks 'gnus-article-decode-hook)
9498         (if hidden
9499             (let ((gnus-treat-hide-headers nil)
9500                   (gnus-treat-hide-boring-headers nil))
9501               (gnus-delete-wash-type 'headers)
9502               (gnus-treat-article 'head))
9503           (gnus-treat-article 'head))
9504         (widen)
9505         (if window
9506             (set-window-start window (goto-char (point-min))))
9507         (if gnus-break-pages
9508             (gnus-narrow-to-page)
9509           (when (gnus-visual-p 'page-marker)
9510             (let ((inhibit-read-only t))
9511               (gnus-remove-text-with-property 'gnus-prev)
9512               (gnus-remove-text-with-property 'gnus-next))))
9513         (gnus-set-mode-line 'article)))))
9514
9515 (defun gnus-summary-show-all-headers ()
9516   "Make all header lines visible."
9517   (interactive)
9518   (gnus-summary-toggle-header 1))
9519
9520 (defun gnus-summary-caesar-message (&optional arg)
9521   "Caesar rotate the current article by 13.
9522 With a non-numerical prefix, also rotate headers.  A numerical
9523 prefix specifies how many places to rotate each letter forward."
9524   (interactive "P")
9525   (gnus-summary-select-article)
9526   (let ((mail-header-separator ""))
9527     (gnus-eval-in-buffer-window gnus-article-buffer
9528       (save-restriction
9529         (widen)
9530         (let ((start (window-start))
9531               (inhibit-read-only t))
9532           (if (equal arg '(4))
9533               (message-caesar-buffer-body nil t)
9534             (message-caesar-buffer-body arg))
9535           (set-window-start (get-buffer-window (current-buffer)) start)))))
9536   ;; Create buttons and stuff...
9537   (gnus-treat-article nil))
9538
9539 (declare-function idna-to-unicode "ext:idna" (str))
9540
9541 (defun gnus-summary-idna-message (&optional arg)
9542   "Decode IDNA encoded domain names in the current articles.
9543 IDNA encoded domain names looks like `xn--bar'.  If a string
9544 remain unencoded after running this function, it is likely an
9545 invalid IDNA string (`xn--bar' is invalid).
9546
9547 You must have GNU Libidn (`http://www.gnu.org/software/libidn/')
9548 installed for this command to work."
9549   (interactive "P")
9550   (if (not (and (condition-case nil (require 'idna)
9551                   (file-error))
9552                 (mm-coding-system-p 'utf-8)
9553                 (executable-find (symbol-value 'idna-program))))
9554       (gnus-message
9555        5 "GNU Libidn not installed properly (`idn' or `idna.el' missing)")
9556     (gnus-summary-select-article)
9557     (let ((mail-header-separator ""))
9558       (gnus-eval-in-buffer-window gnus-article-buffer
9559         (save-restriction
9560           (widen)
9561           (let ((start (window-start))
9562                 buffer-read-only)
9563             (while (re-search-forward "\\(xn--[-0-9a-z]+\\)" nil t)
9564               (replace-match (idna-to-unicode (match-string 1))))
9565             (set-window-start (get-buffer-window (current-buffer)) start)))))))
9566
9567 (defun gnus-summary-morse-message (&optional arg)
9568   "Morse decode the current article."
9569   (interactive "P")
9570   (gnus-summary-select-article)
9571   (let ((mail-header-separator ""))
9572     (gnus-eval-in-buffer-window gnus-article-buffer
9573       (save-excursion
9574         (save-restriction
9575           (widen)
9576           (let ((pos (window-start))
9577                 (inhibit-read-only t))
9578             (goto-char (point-min))
9579             (when (message-goto-body)
9580               (gnus-narrow-to-body))
9581             (goto-char (point-min))
9582             (while (search-forward "·" (point-max) t)
9583               (replace-match "."))
9584             (unmorse-region (point-min) (point-max))
9585             (widen)
9586             (set-window-start (get-buffer-window (current-buffer)) pos)))))))
9587
9588 (defun gnus-summary-stop-page-breaking ()
9589   "Stop page breaking in the current article."
9590   (interactive)
9591   (gnus-summary-select-article)
9592   (gnus-eval-in-buffer-window gnus-article-buffer
9593     (widen)
9594     (when (gnus-visual-p 'page-marker)
9595       (let ((inhibit-read-only t))
9596         (gnus-remove-text-with-property 'gnus-prev)
9597         (gnus-remove-text-with-property 'gnus-next))
9598       (setq gnus-page-broken nil))))
9599
9600 (defun gnus-summary-move-article (&optional n to-newsgroup
9601                                             select-method action)
9602   "Move the current article to a different newsgroup.
9603 If N is a positive number, move the N next articles.
9604 If N is a negative number, move the N previous articles.
9605 If N is nil and any articles have been marked with the process mark,
9606 move those articles instead.
9607 If TO-NEWSGROUP is string, do not prompt for a newsgroup to move to.
9608 If SELECT-METHOD is non-nil, do not move to a specific newsgroup, but
9609 re-spool using this method.
9610
9611 When called interactively with TO-NEWSGROUP being nil, the value of
9612 the variable `gnus-move-split-methods' is used for finding a default
9613 for the target newsgroup.
9614
9615 For this function to work, both the current newsgroup and the
9616 newsgroup that you want to move to have to support the `request-move'
9617 and `request-accept' functions.
9618
9619 ACTION can be either `move' (the default), `crosspost' or `copy'."
9620   (interactive "P")
9621   (unless action
9622     (setq action 'move))
9623   ;; Check whether the source group supports the required functions.
9624   (cond ((and (eq action 'move)
9625               (not (gnus-check-backend-function
9626                     'request-move-article gnus-newsgroup-name)))
9627          (error "The current group does not support article moving"))
9628         ((and (eq action 'crosspost)
9629               (not (gnus-check-backend-function
9630                     'request-replace-article gnus-newsgroup-name)))
9631          (error "The current group does not support article editing")))
9632   (let ((articles (gnus-summary-work-articles n))
9633         (prefix (if (gnus-check-backend-function
9634                      'request-move-article gnus-newsgroup-name)
9635                     (funcall gnus-move-group-prefix-function
9636                              gnus-newsgroup-name)
9637                   ""))
9638         (names '((move "Move" "Moving")
9639                  (copy "Copy" "Copying")
9640                  (crosspost "Crosspost" "Crossposting")))
9641         (copy-buf (save-excursion
9642                     (nnheader-set-temp-buffer " *copy article*")))
9643         art-group to-method new-xref article to-groups
9644         articles-to-update-marks encoded)
9645     (unless (assq action names)
9646       (error "Unknown action %s" action))
9647     ;; Read the newsgroup name.
9648     (when (and (not to-newsgroup)
9649                (not select-method))
9650       (if (and gnus-move-split-methods
9651                (not
9652                 (and (memq gnus-current-article articles)
9653                      (gnus-buffer-live-p gnus-original-article-buffer))))
9654           ;; When `gnus-move-split-methods' is non-nil, we have to
9655           ;; select an article to give `gnus-read-move-group-name' an
9656           ;; opportunity to suggest an appropriate default.  However,
9657           ;; we needn't render or mark the article.
9658           (let ((gnus-display-mime-function nil)
9659                 (gnus-article-prepare-hook nil)
9660                 (gnus-mark-article-hook nil))
9661             (gnus-summary-select-article nil nil nil (car articles))))
9662       (setq to-newsgroup (gnus-read-move-group-name
9663                           (cadr (assq action names))
9664                           (symbol-value
9665                            (intern (format "gnus-current-%s-group" action)))
9666                           articles prefix)
9667             encoded to-newsgroup
9668             to-method (gnus-server-to-method (gnus-group-method to-newsgroup)))
9669       (set (intern (format "gnus-current-%s-group" action))
9670            (mm-decode-coding-string
9671             to-newsgroup
9672             (gnus-group-name-charset to-method to-newsgroup))))
9673     (unless to-method
9674       (setq to-method (or select-method
9675                           (gnus-server-to-method
9676                            (gnus-group-method to-newsgroup)))))
9677     (setq to-newsgroup
9678           (or encoded
9679               (and to-newsgroup
9680                    (mm-encode-coding-string
9681                     to-newsgroup
9682                     (gnus-group-name-charset to-method to-newsgroup)))))
9683     ;; Check the method we are to move this article to...
9684     (unless (gnus-check-backend-function
9685              'request-accept-article (car to-method))
9686       (error "%s does not support article copying" (car to-method)))
9687     (unless (gnus-check-server to-method)
9688       (error "Can't open server %s" (car to-method)))
9689     (gnus-message 6 "%s to %s: %s..."
9690                   (caddr (assq action names))
9691                   (or (car select-method)
9692                       (gnus-group-decoded-name to-newsgroup))
9693                   articles)
9694     (while articles
9695       (setq article (pop articles))
9696       (setq
9697        art-group
9698        (cond
9699         ;; Move the article.
9700         ((eq action 'move)
9701          ;; Remove this article from future suppression.
9702          (gnus-dup-unsuppress-article article)
9703          (let* ((from-method (gnus-find-method-for-group
9704                               gnus-newsgroup-name))
9705                 (to-method (or select-method
9706                                (gnus-find-method-for-group to-newsgroup)))
9707                 (move-is-internal (gnus-method-equal from-method to-method)))
9708            (gnus-request-move-article
9709             article                     ; Article to move
9710             gnus-newsgroup-name         ; From newsgroup
9711             (nth 1 (gnus-find-method-for-group
9712                     gnus-newsgroup-name)) ; Server
9713             (list 'gnus-request-accept-article
9714                   to-newsgroup (list 'quote select-method)
9715                   (not articles) t)     ; Accept form
9716             (not articles)              ; Only save nov last time
9717             move-is-internal)))         ; is this move internal?
9718         ;; Copy the article.
9719         ((eq action 'copy)
9720          (with-current-buffer copy-buf
9721            (when (gnus-request-article-this-buffer article gnus-newsgroup-name)
9722              (save-restriction
9723                (nnheader-narrow-to-headers)
9724                (dolist (hdr gnus-copy-article-ignored-headers)
9725                  (message-remove-header hdr t)))
9726              (gnus-request-accept-article
9727               to-newsgroup select-method (not articles) t))))
9728         ;; Crosspost the article.
9729         ((eq action 'crosspost)
9730          (let ((xref (message-tokenize-header
9731                       (mail-header-xref (gnus-summary-article-header article))
9732                       " ")))
9733            (setq new-xref (concat (gnus-group-real-name gnus-newsgroup-name)
9734                                   ":" (number-to-string article)))
9735            (unless xref
9736              (setq xref (list (system-name))))
9737            (setq new-xref
9738                  (concat
9739                   (mapconcat 'identity
9740                              (delete "Xref:" (delete new-xref xref))
9741                              " ")
9742                   " " new-xref))
9743            (with-current-buffer copy-buf
9744              ;; First put the article in the destination group.
9745              (gnus-request-article-this-buffer article gnus-newsgroup-name)
9746              (when (consp (setq art-group
9747                                 (gnus-request-accept-article
9748                                  to-newsgroup select-method (not articles) t)))
9749                (setq new-xref (concat new-xref " " (car art-group)
9750                                       ":"
9751                                       (number-to-string (cdr art-group))))
9752                ;; Now we have the new Xrefs header, so we insert
9753                ;; it and replace the new article.
9754                (nnheader-replace-header "Xref" new-xref)
9755                (gnus-request-replace-article
9756                 (cdr art-group) to-newsgroup (current-buffer) t)
9757                art-group))))))
9758       (cond
9759        ((not art-group)
9760         (gnus-message 1 "Couldn't %s article %s: %s"
9761                       (cadr (assq action names)) article
9762                       (nnheader-get-report (car to-method))))
9763        ((eq art-group 'junk)
9764         (when (eq action 'move)
9765           (gnus-summary-mark-article article gnus-canceled-mark)
9766           (gnus-message 4 "Deleted article %s" article)
9767           ;; run the delete hook
9768           (run-hook-with-args 'gnus-summary-article-delete-hook
9769                               action
9770                               (gnus-data-header
9771                                (assoc article (gnus-data-list nil)))
9772                               gnus-newsgroup-name nil
9773                               select-method)))
9774        (t
9775         (let* ((pto-group (gnus-group-prefixed-name
9776                            (car art-group) to-method))
9777                (info (gnus-get-info pto-group))
9778                (to-group (gnus-info-group info))
9779                to-marks)
9780           ;; Update the group that has been moved to.
9781           (when (and info
9782                      (memq action '(move copy)))
9783             (unless (member to-group to-groups)
9784               (push to-group to-groups))
9785
9786             (unless (memq article gnus-newsgroup-unreads)
9787               (push 'read to-marks)
9788               (gnus-info-set-read
9789                info (gnus-add-to-range (gnus-info-read info)
9790                                        (list (cdr art-group)))))
9791
9792             ;; See whether the article is to be put in the cache.
9793             (let* ((expirable (gnus-group-auto-expirable-p to-group))
9794                    (marks (if expirable
9795                               gnus-article-mark-lists
9796                             (delete '(expirable . expire)
9797                                     (copy-sequence gnus-article-mark-lists))))
9798                    (to-article (cdr art-group)))
9799
9800               ;; Enter the article into the cache in the new group,
9801               ;; if that is required.
9802               (when gnus-use-cache
9803                 (gnus-cache-possibly-enter-article
9804                  to-group to-article
9805                  (memq article gnus-newsgroup-marked)
9806                  (memq article gnus-newsgroup-dormant)
9807                  (memq article gnus-newsgroup-unreads)))
9808
9809               (when gnus-preserve-marks
9810                 ;; Copy any marks over to the new group.
9811                 (when (and (equal to-group gnus-newsgroup-name)
9812                            (not (memq article gnus-newsgroup-unreads)))
9813                   ;; Mark this article as read in this group.
9814                   (push (cons to-article gnus-read-mark) gnus-newsgroup-reads)
9815                   (setcdr (gnus-active to-group) to-article)
9816                   (setcdr gnus-newsgroup-active to-article))
9817
9818                 (while marks
9819                   (when (eq (gnus-article-mark-to-type (cdar marks)) 'list)
9820                     (when (memq article (symbol-value
9821                                          (intern (format "gnus-newsgroup-%s"
9822                                                          (caar marks)))))
9823                       (push (cdar marks) to-marks)
9824                       ;; If the other group is the same as this group,
9825                       ;; then we have to add the mark to the list.
9826                       (when (equal to-group gnus-newsgroup-name)
9827                         (set (intern (format "gnus-newsgroup-%s" (caar marks)))
9828                              (cons to-article
9829                                    (symbol-value
9830                                     (intern (format "gnus-newsgroup-%s"
9831                                                     (caar marks)))))))
9832                       ;; Copy the marks to other group.
9833                       (gnus-add-marked-articles
9834                        to-group (cdar marks) (list to-article) info)))
9835                   (setq marks (cdr marks)))
9836
9837                 (when (and expirable
9838                            gnus-mark-copied-or-moved-articles-as-expirable
9839                            (not (memq 'expire to-marks)))
9840                   ;; Mark this article as expirable.
9841                   (push 'expire to-marks)
9842                   (when (equal to-group gnus-newsgroup-name)
9843                     (push to-article gnus-newsgroup-expirable))
9844                   ;; Copy the expirable mark to other group.
9845                   (gnus-add-marked-articles
9846                    to-group 'expire (list to-article) info))
9847
9848                 (gnus-request-set-mark
9849                  to-group (list (list (list to-article) 'add to-marks))))
9850
9851               (gnus-dribble-enter
9852                (concat "(gnus-group-set-info '"
9853                        (gnus-prin1-to-string (gnus-get-info to-group))
9854                        ")"))))
9855
9856           ;; Update the Xref header in this article to point to
9857           ;; the new crossposted article we have just created.
9858           (when (eq action 'crosspost)
9859             (with-current-buffer copy-buf
9860               (gnus-request-article-this-buffer article gnus-newsgroup-name)
9861               (nnheader-replace-header "Xref" new-xref)
9862               (gnus-request-replace-article
9863                article gnus-newsgroup-name (current-buffer) t)))
9864
9865           ;; run the move/copy/crosspost/respool hook
9866           (run-hook-with-args 'gnus-summary-article-move-hook
9867                               action
9868                               (gnus-data-header
9869                                (assoc article (gnus-data-list nil)))
9870                               gnus-newsgroup-name
9871                               to-newsgroup
9872                               select-method))
9873
9874         ;;;!!!Why is this necessary?
9875         (set-buffer gnus-summary-buffer)
9876
9877         (gnus-summary-goto-subject article)
9878         (when (eq action 'move)
9879           (gnus-summary-mark-article article gnus-canceled-mark))))
9880       (push article articles-to-update-marks))
9881
9882     (apply 'gnus-summary-remove-process-mark articles-to-update-marks)
9883     ;; Re-activate all groups that have been moved to.
9884     (with-current-buffer gnus-group-buffer
9885       (let ((gnus-group-marked to-groups))
9886         (gnus-group-get-new-news-this-group nil t)))
9887
9888     (gnus-kill-buffer copy-buf)
9889     (gnus-summary-position-point)
9890     (gnus-set-mode-line 'summary)))
9891
9892 (defun gnus-summary-copy-article (&optional n to-newsgroup select-method)
9893   "Copy the current article to some other group.
9894 If TO-NEWSGROUP is string, do not prompt for a newsgroup to copy to.
9895 When called interactively, if TO-NEWSGROUP is nil, use the value of
9896 the variable `gnus-move-split-methods' for finding a default target
9897 newsgroup.
9898 If SELECT-METHOD is non-nil, do not move to a specific newsgroup, but
9899 re-spool using this method."
9900   (interactive "P")
9901   (gnus-summary-move-article n to-newsgroup select-method 'copy))
9902
9903 (defun gnus-summary-crosspost-article (&optional n)
9904   "Crosspost the current article to some other group."
9905   (interactive "P")
9906   (gnus-summary-move-article n nil nil 'crosspost))
9907
9908 (defcustom gnus-summary-respool-default-method nil
9909   "Default method type for respooling an article.
9910 If nil, use to the current newsgroup method."
9911   :type 'symbol
9912   :group 'gnus-summary-mail)
9913
9914 (defun gnus-summary-respool-article (&optional n method)
9915   "Respool the current article.
9916 The article will be squeezed through the mail spooling process again,
9917 which means that it will be put in some mail newsgroup or other
9918 depending on `nnmail-split-methods'.
9919 If N is a positive number, respool the N next articles.
9920 If N is a negative number, respool the N previous articles.
9921 If N is nil and any articles have been marked with the process mark,
9922 respool those articles instead.
9923
9924 Respooling can be done both from mail groups and \"real\" newsgroups.
9925 In the former case, the articles in question will be moved from the
9926 current group into whatever groups they are destined to.  In the
9927 latter case, they will be copied into the relevant groups."
9928   (interactive
9929    (list current-prefix-arg
9930          (let* ((methods (gnus-methods-using 'respool))
9931                 (methname
9932                  (symbol-name (or gnus-summary-respool-default-method
9933                                   (car (gnus-find-method-for-group
9934                                         gnus-newsgroup-name)))))
9935                 (method
9936                  (gnus-completing-read-with-default
9937                   methname "Backend to use when respooling"
9938                   methods nil t nil 'gnus-mail-method-history))
9939                 ms)
9940            (cond
9941             ((zerop (length (setq ms (gnus-servers-using-backend
9942                                       (intern method)))))
9943              (list (intern method) ""))
9944             ((= 1 (length ms))
9945              (car ms))
9946             (t
9947              (let ((ms-alist (mapcar (lambda (m) (cons (cadr m) m)) ms)))
9948                (cdr (assoc (completing-read "Server name: " ms-alist nil t)
9949                            ms-alist))))))))
9950   (unless method
9951     (error "No method given for respooling"))
9952   (if (assoc (symbol-name
9953               (car (gnus-find-method-for-group gnus-newsgroup-name)))
9954              (gnus-methods-using 'respool))
9955       (gnus-summary-move-article n nil method)
9956     (gnus-summary-copy-article n nil method)))
9957
9958 (defun gnus-summary-import-article (file &optional edit)
9959   "Import an arbitrary file into a mail newsgroup."
9960   (interactive "fImport file: \nP")
9961   (let ((group gnus-newsgroup-name)
9962         (now (current-time))
9963         atts lines group-art)
9964     (unless (gnus-check-backend-function 'request-accept-article group)
9965       (error "%s does not support article importing" group))
9966     (or (file-readable-p file)
9967         (not (file-regular-p file))
9968         (error "Can't read %s" file))
9969     (with-current-buffer (gnus-get-buffer-create " *import file*")
9970       (erase-buffer)
9971       (nnheader-insert-file-contents file)
9972       (goto-char (point-min))
9973       (if (nnheader-article-p)
9974           (save-restriction
9975             (goto-char (point-min))
9976             (search-forward "\n\n" nil t)
9977             (narrow-to-region (point-min) (1- (point)))
9978             (goto-char (point-min))
9979             (unless (re-search-forward "^date:" nil t)
9980               (goto-char (point-max))
9981               (insert "Date: " (message-make-date (nth 5 atts)) "\n")))
9982        ;; This doesn't look like an article, so we fudge some headers.
9983         (setq atts (file-attributes file)
9984               lines (count-lines (point-min) (point-max)))
9985         (insert "From: " (read-string "From: ") "\n"
9986                 "Subject: " (read-string "Subject: ") "\n"
9987                 "Date: " (message-make-date (nth 5 atts)) "\n"
9988                 "Message-ID: " (message-make-message-id) "\n"
9989                 "Lines: " (int-to-string lines) "\n"
9990                 "Chars: " (int-to-string (nth 7 atts)) "\n\n"))
9991       (setq group-art (gnus-request-accept-article group nil t))
9992       (kill-buffer (current-buffer)))
9993     (setq gnus-newsgroup-active (gnus-activate-group group))
9994     (forward-line 1)
9995     (gnus-summary-goto-article (cdr group-art) nil t)
9996     (when edit
9997       (gnus-summary-edit-article))))
9998
9999 (defun gnus-summary-create-article ()
10000   "Create an article in a mail newsgroup."
10001   (interactive)
10002   (let ((group gnus-newsgroup-name)
10003         (now (current-time))
10004         group-art)
10005     (unless (gnus-check-backend-function 'request-accept-article group)
10006       (error "%s does not support article importing" group))
10007     (with-current-buffer (gnus-get-buffer-create " *import file*")
10008       (erase-buffer)
10009       (goto-char (point-min))
10010       ;; This doesn't look like an article, so we fudge some headers.
10011       (insert "From: " (read-string "From: ") "\n"
10012               "Subject: " (read-string "Subject: ") "\n"
10013               "Date: " (message-make-date now) "\n"
10014               "Message-ID: " (message-make-message-id) "\n")
10015       (setq group-art (gnus-request-accept-article group nil t))
10016       (kill-buffer (current-buffer)))
10017     (setq gnus-newsgroup-active (gnus-activate-group group))
10018     (forward-line 1)
10019     (gnus-summary-goto-article (cdr group-art) nil t)
10020     (gnus-summary-edit-article)))
10021
10022 (defun gnus-summary-article-posted-p ()
10023   "Say whether the current (mail) article is available from news as well.
10024 This will be the case if the article has both been mailed and posted."
10025   (interactive)
10026   (let ((id (mail-header-references (gnus-summary-article-header)))
10027         (gnus-override-method (car (gnus-refer-article-methods))))
10028     (if (gnus-request-head id "")
10029         (gnus-message 2 "The current message was found on %s"
10030                       gnus-override-method)
10031       (gnus-message 2 "The current message couldn't be found on %s"
10032                     gnus-override-method)
10033       nil)))
10034
10035 (defun gnus-summary-expire-articles (&optional now)
10036   "Expire all articles that are marked as expirable in the current group."
10037   (interactive)
10038   (when (and (not gnus-group-is-exiting-without-update-p)
10039              (gnus-check-backend-function
10040               'request-expire-articles gnus-newsgroup-name))
10041     ;; This backend supports expiry.
10042     (let* ((total (gnus-group-total-expirable-p gnus-newsgroup-name))
10043            (expirable (if total
10044                           (progn
10045                             ;; We need to update the info for
10046                             ;; this group for `gnus-list-of-read-articles'
10047                             ;; to give us the right answer.
10048                             (gnus-run-hooks 'gnus-exit-group-hook)
10049                             (gnus-summary-update-info)
10050                             (gnus-list-of-read-articles gnus-newsgroup-name))
10051                         (setq gnus-newsgroup-expirable
10052                               (sort gnus-newsgroup-expirable '<))))
10053            (expiry-wait (if now 'immediate
10054                           (gnus-group-find-parameter
10055                            gnus-newsgroup-name 'expiry-wait)))
10056            (nnmail-expiry-target
10057             (or (gnus-group-find-parameter gnus-newsgroup-name 'expiry-target)
10058                 nnmail-expiry-target))
10059            es)
10060       (when expirable
10061         ;; There are expirable articles in this group, so we run them
10062         ;; through the expiry process.
10063         (gnus-message 6 "Expiring articles...")
10064         (unless (gnus-check-group gnus-newsgroup-name)
10065           (error "Can't open server for %s" gnus-newsgroup-name))
10066         ;; The list of articles that weren't expired is returned.
10067         (save-excursion
10068           (if expiry-wait
10069               (let ((nnmail-expiry-wait-function nil)
10070                     (nnmail-expiry-wait expiry-wait))
10071                 (setq es (gnus-request-expire-articles
10072                           expirable gnus-newsgroup-name)))
10073             (setq es (gnus-request-expire-articles
10074                       expirable gnus-newsgroup-name)))
10075           (unless total
10076             (setq gnus-newsgroup-expirable es))
10077           ;; We go through the old list of expirable, and mark all
10078           ;; really expired articles as nonexistent.
10079           (unless (eq es expirable) ;If nothing was expired, we don't mark.
10080             (let ((gnus-use-cache nil))
10081               (dolist (article expirable)
10082                 (when (and (not (memq article es))
10083                            (gnus-data-find article))
10084                   (gnus-summary-mark-article article gnus-canceled-mark)
10085                   (run-hook-with-args 'gnus-summary-article-expire-hook
10086                                       'delete
10087                                       (gnus-data-header
10088                                        (assoc article (gnus-data-list nil)))
10089                                       gnus-newsgroup-name
10090                                       nil
10091                                       nil))))))
10092         (gnus-message 6 "Expiring articles...done")))))
10093
10094 (defun gnus-summary-expire-articles-now ()
10095   "Expunge all expirable articles in the current group.
10096 This means that *all* articles that are marked as expirable will be
10097 deleted forever, right now."
10098   (interactive)
10099   (or gnus-expert-user
10100       (gnus-yes-or-no-p
10101        "Are you really, really sure you want to delete all expirable messages? ")
10102       (error "Phew!"))
10103   (gnus-summary-expire-articles t))
10104
10105 ;; Suggested by Jack Vinson <vinson@unagi.cis.upenn.edu>.
10106 (defun gnus-summary-delete-article (&optional n)
10107   "Delete the N next (mail) articles.
10108 This command actually deletes articles.  This is not a marking
10109 command.  The article will disappear forever from your life, never to
10110 return.
10111
10112 If N is negative, delete backwards.
10113 If N is nil and articles have been marked with the process mark,
10114 delete these instead.
10115
10116 If `gnus-novice-user' is non-nil you will be asked for
10117 confirmation before the articles are deleted."
10118   (interactive "P")
10119   (unless (gnus-check-backend-function 'request-expire-articles
10120                                        gnus-newsgroup-name)
10121     (error "The current newsgroup does not support article deletion"))
10122   (unless (gnus-check-server (gnus-find-method-for-group gnus-newsgroup-name))
10123     (error "Couldn't open server"))
10124   ;; Compute the list of articles to delete.
10125   (let ((articles (sort (copy-sequence (gnus-summary-work-articles n)) '<))
10126         (nnmail-expiry-target 'delete)
10127         not-deleted)
10128     (if (and gnus-novice-user
10129              (not (gnus-yes-or-no-p
10130                    (format "Do you really want to delete %s forever? "
10131                            (if (> (length articles) 1)
10132                                (format "these %s articles" (length articles))
10133                              "this article")))))
10134         ()
10135       ;; Delete the articles.
10136       (setq not-deleted (gnus-request-expire-articles
10137                          articles gnus-newsgroup-name 'force))
10138       (while articles
10139         (gnus-summary-remove-process-mark (car articles))
10140         ;; The backend might not have been able to delete the article
10141         ;; after all.
10142         (unless (memq (car articles) not-deleted)
10143           (gnus-summary-mark-article (car articles) gnus-canceled-mark))
10144         (let* ((article (car articles))
10145                (ghead  (gnus-data-header
10146                                     (assoc article (gnus-data-list nil)))))
10147           (run-hook-with-args 'gnus-summary-article-delete-hook
10148                               'delete ghead gnus-newsgroup-name nil
10149                               nil))
10150         (setq articles (cdr articles)))
10151       (when not-deleted
10152         (gnus-message 4 "Couldn't delete articles %s" not-deleted)))
10153     (gnus-summary-position-point)
10154     (gnus-set-mode-line 'summary)
10155     not-deleted))
10156
10157 (defun gnus-summary-edit-article (&optional arg)
10158   "Edit the current article.
10159 This will have permanent effect only in mail groups.
10160 If ARG is nil, edit the decoded articles.
10161 If ARG is 1, edit the raw articles.
10162 If ARG is 2, edit the raw articles even in read-only groups.
10163 If ARG is 3, edit the articles with the current handles.
10164 Otherwise, allow editing of articles even in read-only
10165 groups."
10166   (interactive "P")
10167   (let (force raw current-handles)
10168     (cond
10169      ((null arg))
10170      ((eq arg 1)
10171       (setq raw t))
10172      ((eq arg 2)
10173       (setq raw t
10174             force t))
10175      ((eq arg 3)
10176       (setq current-handles
10177             (and (gnus-buffer-live-p gnus-article-buffer)
10178                  (with-current-buffer gnus-article-buffer
10179                    (prog1
10180                        gnus-article-mime-handles
10181                      (setq gnus-article-mime-handles nil))))))
10182      (t
10183       (setq force t)))
10184     (when (and raw (not force)
10185                (member gnus-newsgroup-name '("nndraft:delayed"
10186                                              "nndraft:drafts"
10187                                              "nndraft:queue")))
10188       (error "Can't edit the raw article in group %s"
10189              gnus-newsgroup-name))
10190     (with-current-buffer gnus-summary-buffer
10191       (let ((mail-parse-charset gnus-newsgroup-charset)
10192             (mail-parse-ignored-charsets gnus-newsgroup-ignored-charsets))
10193         (gnus-set-global-variables)
10194         (when (and (not force)
10195                    (gnus-group-read-only-p))
10196           (error "The current newsgroup does not support article editing"))
10197         (gnus-summary-show-article t)
10198         (when (and (not raw) (gnus-buffer-live-p gnus-article-buffer))
10199           (with-current-buffer gnus-article-buffer
10200             (mm-enable-multibyte)))
10201         (if (member gnus-newsgroup-name '("nndraft:delayed" "nndraft:drafts"))
10202             (setq raw t))
10203         (gnus-article-edit-article
10204          (if raw 'ignore
10205            `(lambda ()
10206               (let ((mbl mml-buffer-list))
10207                 (setq mml-buffer-list nil)
10208                 (let ((rfc2047-quote-decoded-words-containing-tspecials t))
10209                   (mime-to-mml ,'current-handles))
10210                 (let ((mbl1 mml-buffer-list))
10211                   (setq mml-buffer-list mbl)
10212                   (set (make-local-variable 'mml-buffer-list) mbl1))
10213                 (gnus-make-local-hook 'kill-buffer-hook)
10214                 (add-hook 'kill-buffer-hook 'mml-destroy-buffers t t))))
10215          `(lambda (no-highlight)
10216             (let ((mail-parse-charset ',gnus-newsgroup-charset)
10217                   (message-options message-options)
10218                   (message-options-set-recipient)
10219                   (mail-parse-ignored-charsets
10220                    ',gnus-newsgroup-ignored-charsets)
10221                   (rfc2047-header-encoding-alist
10222                    ',(let ((charset (gnus-group-name-charset
10223                                      (gnus-find-method-for-group
10224                                       gnus-newsgroup-name)
10225                                      gnus-newsgroup-name)))
10226                        (append (list (cons "Newsgroups" charset)
10227                                      (cons "Followup-To" charset)
10228                                      (cons "Xref" charset))
10229                                rfc2047-header-encoding-alist))))
10230               ,(if (not raw) '(progn
10231                                 (mml-to-mime)
10232                                 (mml-destroy-buffers)
10233                                 (remove-hook 'kill-buffer-hook
10234                                              'mml-destroy-buffers t)
10235                                 (kill-local-variable 'mml-buffer-list)))
10236               (gnus-summary-edit-article-done
10237                ,(or (mail-header-references gnus-current-headers) "")
10238                ,(gnus-group-read-only-p)
10239                ,gnus-summary-buffer no-highlight))))))))
10240
10241 (defalias 'gnus-summary-edit-article-postpone 'gnus-article-edit-exit)
10242
10243 (defun gnus-summary-edit-article-done (&optional references read-only buffer
10244                                                  no-highlight)
10245   "Make edits to the current article permanent."
10246   (interactive)
10247   (save-excursion
10248    ;; The buffer restriction contains the entire article if it exists.
10249     (when (article-goto-body)
10250       (let ((lines (count-lines (point) (point-max)))
10251             (length (- (point-max) (point)))
10252             (case-fold-search t)
10253             (body (copy-marker (point))))
10254         (goto-char (point-min))
10255         (when (re-search-forward "^content-length:[ \t]\\([0-9]+\\)" body t)
10256           (delete-region (match-beginning 1) (match-end 1))
10257           (insert (number-to-string length)))
10258         (goto-char (point-min))
10259         (when (re-search-forward
10260                "^x-content-length:[ \t]\\([0-9]+\\)" body t)
10261           (delete-region (match-beginning 1) (match-end 1))
10262           (insert (number-to-string length)))
10263         (goto-char (point-min))
10264         (when (re-search-forward "^lines:[ \t]\\([0-9]+\\)" body t)
10265           (delete-region (match-beginning 1) (match-end 1))
10266           (insert (number-to-string lines))))))
10267   ;; Replace the article.
10268   (let ((buf (current-buffer)))
10269     (with-temp-buffer
10270       (insert-buffer-substring buf)
10271
10272       (if (and (not read-only)
10273                (not (gnus-request-replace-article
10274                      (cdr gnus-article-current) (car gnus-article-current)
10275                      (current-buffer) t)))
10276           (error "Couldn't replace article")
10277         ;; Update the summary buffer.
10278         (if (and references
10279                  (equal (message-tokenize-header references " ")
10280                         (message-tokenize-header
10281                          (or (message-fetch-field "references") "") " ")))
10282             ;; We only have to update this line.
10283             (save-excursion
10284               (save-restriction
10285                 (message-narrow-to-head)
10286                 (let ((head (buffer-substring-no-properties
10287                              (point-min) (point-max)))
10288                       header)
10289                   (with-temp-buffer
10290                     (insert (format "211 %d Article retrieved.\n"
10291                                     (cdr gnus-article-current)))
10292                     (insert head)
10293                     (insert ".\n")
10294                     (let ((nntp-server-buffer (current-buffer)))
10295                       (setq header (car (gnus-get-newsgroup-headers
10296                                          nil t))))
10297                     (with-current-buffer gnus-summary-buffer
10298                       (gnus-data-set-header
10299                        (gnus-data-find (cdr gnus-article-current))
10300                        header)
10301                       (gnus-summary-update-article-line
10302                        (cdr gnus-article-current) header)
10303                       (if (gnus-summary-goto-subject
10304                            (cdr gnus-article-current) nil t)
10305                           (gnus-summary-update-secondary-mark
10306                            (cdr gnus-article-current))))))))
10307           ;; Update threads.
10308           (set-buffer (or buffer gnus-summary-buffer))
10309           (gnus-summary-update-article (cdr gnus-article-current))
10310           (if (gnus-summary-goto-subject (cdr gnus-article-current) nil t)
10311               (gnus-summary-update-secondary-mark
10312                (cdr gnus-article-current))))
10313         ;; Prettify the article buffer again.
10314         (unless no-highlight
10315           (with-current-buffer gnus-article-buffer
10316             ;;;!!! Fix this -- article should be rehighlighted.
10317             ;;;(gnus-run-hooks 'gnus-article-display-hook)
10318             (set-buffer gnus-original-article-buffer)
10319             (gnus-request-article
10320              (cdr gnus-article-current)
10321              (car gnus-article-current) (current-buffer))))
10322         ;; Prettify the summary buffer line.
10323         (when (gnus-visual-p 'summary-highlight 'highlight)
10324           (gnus-run-hooks 'gnus-visual-mark-article-hook))))))
10325
10326 (defun gnus-summary-edit-wash (key)
10327   "Perform editing command KEY in the article buffer."
10328   (interactive
10329    (list
10330     (progn
10331       (message "%s" (concat (this-command-keys) "- "))
10332       (read-char))))
10333   (message "")
10334   (gnus-summary-edit-article)
10335   (execute-kbd-macro (concat (this-command-keys) key))
10336   (gnus-article-edit-done))
10337
10338 ;;; Respooling
10339
10340 (defun gnus-summary-respool-query (&optional silent trace)
10341   "Query where the respool algorithm would put this article."
10342   (interactive)
10343   (let (gnus-mark-article-hook)
10344     (gnus-summary-select-article)
10345     (with-current-buffer gnus-original-article-buffer
10346       (let ((groups (nnmail-article-group 'identity trace)))
10347         (unless silent
10348           (if groups
10349               (message "This message would go to %s"
10350                        (mapconcat 'car groups ", "))
10351             (message "This message would go to no groups"))
10352           groups)))))
10353
10354 (defun gnus-summary-respool-trace ()
10355   "Trace where the respool algorithm would put this article.
10356 Display a buffer showing all fancy splitting patterns which matched."
10357   (interactive)
10358   (gnus-summary-respool-query nil t))
10359
10360 ;; Summary marking commands.
10361
10362 (defun gnus-summary-kill-same-subject-and-select (&optional unmark)
10363   "Mark articles which has the same subject as read, and then select the next.
10364 If UNMARK is positive, remove any kind of mark.
10365 If UNMARK is negative, tick articles."
10366   (interactive "P")
10367   (when unmark
10368     (setq unmark (prefix-numeric-value unmark)))
10369   (let ((count
10370          (gnus-summary-mark-same-subject
10371           (gnus-summary-article-subject) unmark)))
10372     ;; Select next unread article.  If auto-select-same mode, should
10373     ;; select the first unread article.
10374     (gnus-summary-next-article t (and gnus-auto-select-same
10375                                       (gnus-summary-article-subject)))
10376     (gnus-message 7 "%d article%s marked as %s"
10377                   count (if (= count 1) " is" "s are")
10378                   (if unmark "unread" "read"))))
10379
10380 (defun gnus-summary-kill-same-subject (&optional unmark)
10381   "Mark articles which has the same subject as read.
10382 If UNMARK is positive, remove any kind of mark.
10383 If UNMARK is negative, tick articles."
10384   (interactive "P")
10385   (when unmark
10386     (setq unmark (prefix-numeric-value unmark)))
10387   (let ((count
10388          (gnus-summary-mark-same-subject
10389           (gnus-summary-article-subject) unmark)))
10390     ;; If marked as read, go to next unread subject.
10391     (when (null unmark)
10392       ;; Go to next unread subject.
10393       (gnus-summary-next-subject 1 t))
10394     (gnus-message 7 "%d articles are marked as %s"
10395                   count (if unmark "unread" "read"))))
10396
10397 (defun gnus-summary-mark-same-subject (subject &optional unmark)
10398   "Mark articles with same SUBJECT as read, and return marked number.
10399 If optional argument UNMARK is positive, remove any kinds of marks.
10400 If optional argument UNMARK is negative, mark articles as unread instead."
10401   (let ((count 1))
10402     (save-excursion
10403       (cond
10404        ((null unmark)                   ; Mark as read.
10405         (while (and
10406                 (progn
10407                   (gnus-summary-mark-article-as-read gnus-killed-mark)
10408                   (gnus-summary-show-thread) t)
10409                 (gnus-summary-find-subject subject))
10410           (setq count (1+ count))))
10411        ((> unmark 0)                    ; Tick.
10412         (while (and
10413                 (progn
10414                   (gnus-summary-mark-article-as-unread gnus-ticked-mark)
10415                   (gnus-summary-show-thread) t)
10416                 (gnus-summary-find-subject subject))
10417           (setq count (1+ count))))
10418        (t                               ; Mark as unread.
10419         (while (and
10420                 (progn
10421                   (gnus-summary-mark-article-as-unread gnus-unread-mark)
10422                   (gnus-summary-show-thread) t)
10423                 (gnus-summary-find-subject subject))
10424           (setq count (1+ count)))))
10425       (gnus-set-mode-line 'summary)
10426       ;; Return the number of marked articles.
10427       count)))
10428
10429 (defun gnus-summary-mark-as-processable (n &optional unmark)
10430   "Set the process mark on the next N articles.
10431 If N is negative, mark backward instead.  If UNMARK is non-nil, remove
10432 the process mark instead.  The difference between N and the actual
10433 number of articles marked is returned."
10434   (interactive "P")
10435   (if (and (null n) (gnus-region-active-p))
10436       (gnus-uu-mark-region (region-beginning) (region-end) unmark)
10437     (setq n (prefix-numeric-value n))
10438     (let ((backward (< n 0))
10439           (n (abs n)))
10440       (while (and
10441               (> n 0)
10442               (if unmark
10443                   (gnus-summary-remove-process-mark
10444                    (gnus-summary-article-number))
10445                 (gnus-summary-set-process-mark (gnus-summary-article-number)))
10446               (zerop (gnus-summary-next-subject (if backward -1 1) nil t)))
10447         (setq n (1- n)))
10448       (when (/= 0 n)
10449         (gnus-message 7 "No more articles"))
10450       (gnus-summary-recenter)
10451       (gnus-summary-position-point)
10452       n)))
10453
10454 (defun gnus-summary-unmark-as-processable (n)
10455   "Remove the process mark from the next N articles.
10456 If N is negative, unmark backward instead.  The difference between N and
10457 the actual number of articles unmarked is returned."
10458   (interactive "P")
10459   (gnus-summary-mark-as-processable n t))
10460
10461 (defun gnus-summary-unmark-all-processable ()
10462   "Remove the process mark from all articles."
10463   (interactive)
10464   (save-excursion
10465     (while gnus-newsgroup-processable
10466       (gnus-summary-remove-process-mark (car gnus-newsgroup-processable))))
10467   (gnus-summary-position-point))
10468
10469 (defun gnus-summary-add-mark (article type)
10470   "Mark ARTICLE with a mark of TYPE."
10471   (let ((vtype (car (assq type gnus-article-mark-lists)))
10472         var)
10473     (if (not vtype)
10474         (error "No such mark type: %s" type)
10475       (setq var (intern (format "gnus-newsgroup-%s" type)))
10476       (set var (cons article (symbol-value var)))
10477       (if (memq type '(processable cached replied forwarded recent saved))
10478           (gnus-summary-update-secondary-mark article)
10479         ;;; !!! This is bogus.  We should find out what primary
10480         ;;; !!! mark we want to set.
10481         (gnus-summary-update-mark gnus-del-mark 'unread)))))
10482
10483 (defun gnus-summary-mark-as-expirable (n)
10484   "Mark N articles forward as expirable.
10485 If N is negative, mark backward instead.  The difference between N and
10486 the actual number of articles marked is returned."
10487   (interactive "p")
10488   (gnus-summary-mark-forward n gnus-expirable-mark))
10489
10490 (defun gnus-summary-mark-as-spam (n)
10491   "Mark N articles forward as spam.
10492 If N is negative, mark backward instead.  The difference between N and
10493 the actual number of articles marked is returned."
10494   (interactive "p")
10495   (gnus-summary-mark-forward n gnus-spam-mark))
10496
10497 (defun gnus-summary-mark-article-as-replied (article)
10498   "Mark ARTICLE as replied to and update the summary line.
10499 ARTICLE can also be a list of articles."
10500   (interactive (list (gnus-summary-article-number)))
10501   (let ((articles (if (listp article) article (list article))))
10502     (dolist (article articles)
10503       (unless (numberp article)
10504         (error "%s is not a number" article))
10505       (push article gnus-newsgroup-replied)
10506       (let ((inhibit-read-only t))
10507         (when (gnus-summary-goto-subject article nil t)
10508           (gnus-summary-update-secondary-mark article))))))
10509
10510 (defun gnus-summary-mark-article-as-forwarded (article)
10511   "Mark ARTICLE as forwarded and update the summary line.
10512 ARTICLE can also be a list of articles."
10513   (let ((articles (if (listp article) article (list article))))
10514     (dolist (article articles)
10515       (push article gnus-newsgroup-forwarded)
10516       (let ((inhibit-read-only t))
10517         (when (gnus-summary-goto-subject article nil t)
10518           (gnus-summary-update-secondary-mark article))))))
10519
10520 (defun gnus-summary-set-bookmark (article)
10521   "Set a bookmark in current article."
10522   (interactive (list (gnus-summary-article-number)))
10523   (when (or (not (get-buffer gnus-article-buffer))
10524             (not gnus-current-article)
10525             (not gnus-article-current)
10526             (not (equal gnus-newsgroup-name (car gnus-article-current))))
10527     (error "No current article selected"))
10528   ;; Remove old bookmark, if one exists.
10529   (gnus-pull article gnus-newsgroup-bookmarks)
10530   ;; Set the new bookmark, which is on the form
10531   ;; (article-number . line-number-in-body).
10532   (push
10533    (cons article
10534          (with-current-buffer gnus-article-buffer
10535            (count-lines
10536             (min (point)
10537                  (save-excursion
10538                    (article-goto-body)
10539                    (point)))
10540             (point))))
10541    gnus-newsgroup-bookmarks)
10542   (gnus-message 6 "A bookmark has been added to the current article."))
10543
10544 (defun gnus-summary-remove-bookmark (article)
10545   "Remove the bookmark from the current article."
10546   (interactive (list (gnus-summary-article-number)))
10547   ;; Remove old bookmark, if one exists.
10548   (if (not (assq article gnus-newsgroup-bookmarks))
10549       (gnus-message 6 "No bookmark in current article.")
10550     (gnus-pull article gnus-newsgroup-bookmarks)
10551     (gnus-message 6 "Removed bookmark.")))
10552
10553 ;; Suggested by Daniel Quinlan <quinlan@best.com>.
10554 (defun gnus-summary-mark-as-dormant (n)
10555   "Mark N articles forward as dormant.
10556 If N is negative, mark backward instead.  The difference between N and
10557 the actual number of articles marked is returned."
10558   (interactive "p")
10559   (gnus-summary-mark-forward n gnus-dormant-mark))
10560
10561 (defun gnus-summary-set-process-mark (article)
10562   "Set the process mark on ARTICLE and update the summary line."
10563   (setq gnus-newsgroup-processable
10564         (cons article
10565               (delq article gnus-newsgroup-processable)))
10566   (when (gnus-summary-goto-subject article)
10567     (gnus-summary-show-thread)
10568     (gnus-summary-goto-subject article)
10569     (gnus-summary-update-secondary-mark article)))
10570
10571 (defun gnus-summary-remove-process-mark (&rest articles)
10572   "Remove the process mark from ARTICLES and update the summary line."
10573   (dolist (article articles)
10574     (setq gnus-newsgroup-processable (delq article gnus-newsgroup-processable))
10575     (when (gnus-summary-goto-subject article)
10576       (gnus-summary-show-thread)
10577       (gnus-summary-goto-subject article)
10578       (gnus-summary-update-secondary-mark article)))
10579   t)
10580
10581 (defun gnus-summary-set-saved-mark (article)
10582   "Set the process mark on ARTICLE and update the summary line."
10583   (push article gnus-newsgroup-saved)
10584   (when (gnus-summary-goto-subject article)
10585     (gnus-summary-update-secondary-mark article)))
10586
10587 (defun gnus-summary-mark-forward (n &optional mark no-expire)
10588   "Mark N articles as read forwards.
10589 If N is negative, mark backwards instead.  Mark with MARK, ?r by default.
10590 The difference between N and the actual number of articles marked is
10591 returned.
10592 If NO-EXPIRE, auto-expiry will be inhibited."
10593   (interactive "p")
10594   (gnus-summary-show-thread)
10595   (let ((backward (< n 0))
10596         (gnus-summary-goto-unread
10597          (and gnus-summary-goto-unread
10598               (not (eq gnus-summary-goto-unread 'never))
10599               (not (memq mark (list gnus-unread-mark gnus-spam-mark
10600                                     gnus-ticked-mark gnus-dormant-mark)))))
10601         (n (abs n))
10602         (mark (or mark gnus-del-mark)))
10603     (while (and (> n 0)
10604                 (gnus-summary-mark-article nil mark no-expire)
10605                 (zerop (gnus-summary-next-subject
10606                         (if backward -1 1)
10607                         (and gnus-summary-goto-unread
10608                              (not (eq gnus-summary-goto-unread 'never)))
10609                         t)))
10610       (setq n (1- n)))
10611     (when (/= 0 n)
10612       (gnus-message 7 "No more %sarticles" (if mark "" "unread ")))
10613     (gnus-summary-recenter)
10614     (gnus-summary-position-point)
10615     (gnus-set-mode-line 'summary)
10616     n))
10617
10618 (defun gnus-summary-mark-article-as-read (mark)
10619   "Mark the current article quickly as read with MARK."
10620   (let ((article (gnus-summary-article-number)))
10621     (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
10622     (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
10623     (setq gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked))
10624     (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
10625     (push (cons article mark) gnus-newsgroup-reads)
10626     ;; Possibly remove from cache, if that is used.
10627     (when gnus-use-cache
10628       (gnus-cache-enter-remove-article article))
10629     ;; Allow the backend to change the mark.
10630     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
10631     ;; Check for auto-expiry.
10632     (when (and gnus-newsgroup-auto-expire
10633                (memq mark gnus-auto-expirable-marks))
10634       (setq mark gnus-expirable-mark)
10635       ;; Let the backend know about the mark change.
10636       (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
10637       (push article gnus-newsgroup-expirable))
10638     ;; Set the mark in the buffer.
10639     (gnus-summary-update-mark mark 'unread)
10640     t))
10641
10642 (defun gnus-summary-mark-article-as-unread (mark)
10643   "Mark the current article quickly as unread with MARK."
10644   (let* ((article (gnus-summary-article-number))
10645          (old-mark (gnus-summary-article-mark article)))
10646     ;; Allow the backend to change the mark.
10647     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
10648     (if (eq mark old-mark)
10649         t
10650       (if (<= article 0)
10651           (progn
10652             (gnus-error 1 "Can't mark negative article numbers")
10653             nil)
10654         (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
10655         (setq gnus-newsgroup-spam-marked
10656               (delq article gnus-newsgroup-spam-marked))
10657         (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
10658         (setq gnus-newsgroup-expirable (delq article gnus-newsgroup-expirable))
10659         (setq gnus-newsgroup-reads (delq article gnus-newsgroup-reads))
10660         (cond ((= mark gnus-ticked-mark)
10661                (setq gnus-newsgroup-marked
10662                      (gnus-add-to-sorted-list gnus-newsgroup-marked
10663                                               article)))
10664               ((= mark gnus-spam-mark)
10665                (setq gnus-newsgroup-spam-marked
10666                      (gnus-add-to-sorted-list gnus-newsgroup-spam-marked
10667                                               article)))
10668               ((= mark gnus-dormant-mark)
10669                (setq gnus-newsgroup-dormant
10670                      (gnus-add-to-sorted-list gnus-newsgroup-dormant
10671                                               article)))
10672               (t
10673                (setq gnus-newsgroup-unreads
10674                      (gnus-add-to-sorted-list gnus-newsgroup-unreads
10675                                               article))))
10676         (gnus-pull article gnus-newsgroup-reads)
10677
10678         ;; See whether the article is to be put in the cache.
10679         (and gnus-use-cache
10680              (vectorp (gnus-summary-article-header article))
10681              (save-excursion
10682                (gnus-cache-possibly-enter-article
10683                 gnus-newsgroup-name article
10684                 (= mark gnus-ticked-mark)
10685                 (= mark gnus-dormant-mark) (= mark gnus-unread-mark))))
10686
10687         ;; Fix the mark.
10688         (gnus-summary-update-mark mark 'unread)
10689         t))))
10690
10691 (defun gnus-summary-mark-article (&optional article mark no-expire)
10692   "Mark ARTICLE with MARK.  MARK can be any character.
10693 Four MARK strings are reserved: `? ' (unread), `?!' (ticked),
10694 `??' (dormant) and `?E' (expirable).
10695 If MARK is nil, then the default character `?r' is used.
10696 If ARTICLE is nil, then the article on the current line will be
10697 marked.
10698 If NO-EXPIRE, auto-expiry will be inhibited."
10699   ;; The mark might be a string.
10700   (when (stringp mark)
10701     (setq mark (aref mark 0)))
10702   ;; If no mark is given, then we check auto-expiring.
10703   (when (null mark)
10704     (setq mark gnus-del-mark))
10705   (when (and (not no-expire)
10706              gnus-newsgroup-auto-expire
10707              (memq mark gnus-auto-expirable-marks))
10708     (setq mark gnus-expirable-mark))
10709   (let ((article (or article (gnus-summary-article-number)))
10710         (old-mark (gnus-summary-article-mark article)))
10711     ;; Allow the backend to change the mark.
10712     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
10713     (if (eq mark old-mark)
10714         t
10715       (unless article
10716         (error "No article on current line"))
10717       (if (not (if (or (= mark gnus-unread-mark)
10718                        (= mark gnus-ticked-mark)
10719                        (= mark gnus-spam-mark)
10720                        (= mark gnus-dormant-mark))
10721                    (gnus-mark-article-as-unread article mark)
10722                  (gnus-mark-article-as-read article mark)))
10723           t
10724         ;; See whether the article is to be put in the cache.
10725         (and gnus-use-cache
10726              (not (= mark gnus-canceled-mark))
10727              (vectorp (gnus-summary-article-header article))
10728              (save-excursion
10729                (gnus-cache-possibly-enter-article
10730                 gnus-newsgroup-name article
10731                 (= mark gnus-ticked-mark)
10732                 (= mark gnus-dormant-mark) (= mark gnus-unread-mark))))
10733
10734         (when (gnus-summary-goto-subject article nil t)
10735           (let ((inhibit-read-only t))
10736             (gnus-summary-show-thread)
10737             ;; Fix the mark.
10738             (gnus-summary-update-mark mark 'unread)
10739             t))))))
10740
10741 (defun gnus-summary-update-secondary-mark (article)
10742   "Update the secondary (read, process, cache) mark."
10743   (gnus-summary-update-mark
10744    (cond ((memq article gnus-newsgroup-processable)
10745           gnus-process-mark)
10746          ((memq article gnus-newsgroup-cached)
10747           gnus-cached-mark)
10748          ((memq article gnus-newsgroup-replied)
10749           gnus-replied-mark)
10750          ((memq article gnus-newsgroup-forwarded)
10751           gnus-forwarded-mark)
10752          ((memq article gnus-newsgroup-saved)
10753           gnus-saved-mark)
10754          ((memq article gnus-newsgroup-recent)
10755           gnus-recent-mark)
10756          ((memq article gnus-newsgroup-unseen)
10757           gnus-unseen-mark)
10758          (t gnus-no-mark))
10759    'replied)
10760   (when (gnus-visual-p 'summary-highlight 'highlight)
10761     (gnus-run-hooks 'gnus-summary-update-hook))
10762   t)
10763
10764 (defun gnus-summary-update-download-mark (article)
10765   "Update the download mark."
10766   (gnus-summary-update-mark
10767    (cond ((memq article gnus-newsgroup-undownloaded)
10768           gnus-undownloaded-mark)
10769          (gnus-newsgroup-agentized
10770           gnus-downloaded-mark)
10771          (t
10772           gnus-no-mark))
10773    'download)
10774   (gnus-summary-update-line t)
10775   t)
10776
10777 (defun gnus-summary-update-mark (mark type)
10778   (let ((forward (cdr (assq type gnus-summary-mark-positions)))
10779         (inhibit-read-only t))
10780     (re-search-backward "[\n\r]" (point-at-bol) 'move-to-limit)
10781     (when forward
10782       (when (looking-at "\r")
10783         (incf forward))
10784       (when (<= (+ forward (point)) (point-max))
10785         ;; Go to the right position on the line.
10786         (goto-char (+ forward (point)))
10787         ;; Replace the old mark with the new mark.
10788         (subst-char-in-region (point) (1+ (point)) (char-after) mark)
10789         ;; Optionally update the marks by some user rule.
10790         (when (eq type 'unread)
10791           (gnus-data-set-mark
10792            (gnus-data-find (gnus-summary-article-number)) mark)
10793           (gnus-summary-update-line (eq mark gnus-unread-mark)))))))
10794
10795 (defun gnus-mark-article-as-read (article &optional mark)
10796   "Enter ARTICLE in the pertinent lists and remove it from others."
10797   ;; Make the article expirable.
10798   (let ((mark (or mark gnus-del-mark)))
10799     (setq gnus-newsgroup-expirable
10800           (if (= mark gnus-expirable-mark)
10801               (gnus-add-to-sorted-list gnus-newsgroup-expirable article)
10802             (delq article gnus-newsgroup-expirable)))
10803     ;; Remove from unread and marked lists.
10804     (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
10805     (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
10806     (setq gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked))
10807     (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
10808     (push (cons article mark) gnus-newsgroup-reads)
10809     ;; Possibly remove from cache, if that is used.
10810     (when gnus-use-cache
10811       (gnus-cache-enter-remove-article article))
10812     t))
10813
10814 (defun gnus-mark-article-as-unread (article &optional mark)
10815   "Enter ARTICLE in the pertinent lists and remove it from others."
10816   (let ((mark (or mark gnus-ticked-mark)))
10817     (if (<= article 0)
10818         (progn
10819           (gnus-error 1 "Can't mark negative article numbers")
10820           nil)
10821       (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked)
10822             gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked)
10823             gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant)
10824             gnus-newsgroup-expirable (delq article gnus-newsgroup-expirable)
10825             gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
10826
10827       ;; Unsuppress duplicates?
10828       (when gnus-suppress-duplicates
10829         (gnus-dup-unsuppress-article article))
10830
10831       (cond ((= mark gnus-ticked-mark)
10832              (setq gnus-newsgroup-marked
10833                    (gnus-add-to-sorted-list gnus-newsgroup-marked article)))
10834             ((= mark gnus-spam-mark)
10835              (setq gnus-newsgroup-spam-marked
10836                    (gnus-add-to-sorted-list gnus-newsgroup-spam-marked
10837                                             article)))
10838             ((= mark gnus-dormant-mark)
10839              (setq gnus-newsgroup-dormant
10840                    (gnus-add-to-sorted-list gnus-newsgroup-dormant article)))
10841             (t
10842              (setq gnus-newsgroup-unreads
10843                    (gnus-add-to-sorted-list gnus-newsgroup-unreads article))))
10844       (gnus-pull article gnus-newsgroup-reads)
10845       t)))
10846
10847 (defalias 'gnus-summary-mark-as-unread-forward
10848   'gnus-summary-tick-article-forward)
10849 (make-obsolete 'gnus-summary-mark-as-unread-forward
10850                'gnus-summary-tick-article-forward "Emacs 20.4")
10851 (defun gnus-summary-tick-article-forward (n)
10852   "Tick N articles forwards.
10853 If N is negative, tick backwards instead.
10854 The difference between N and the number of articles ticked is returned."
10855   (interactive "p")
10856   (gnus-summary-mark-forward n gnus-ticked-mark))
10857
10858 (defalias 'gnus-summary-mark-as-unread-backward
10859   'gnus-summary-tick-article-backward)
10860 (make-obsolete 'gnus-summary-mark-as-unread-backward
10861                'gnus-summary-tick-article-backward "Emacs 20.4")
10862 (defun gnus-summary-tick-article-backward (n)
10863   "Tick N articles backwards.
10864 The difference between N and the number of articles ticked is returned."
10865   (interactive "p")
10866   (gnus-summary-mark-forward (- n) gnus-ticked-mark))
10867
10868 (defalias 'gnus-summary-mark-as-unread 'gnus-summary-tick-article)
10869 (make-obsolete 'gnus-summary-mark-as-unread 'gnus-summary-tick-article "Emacs 20.4")
10870 (defun gnus-summary-tick-article (&optional article clear-mark)
10871   "Mark current article as unread.
10872 Optional 1st argument ARTICLE specifies article number to be marked as unread.
10873 Optional 2nd argument CLEAR-MARK remove any kinds of mark."
10874   (interactive)
10875   (gnus-summary-mark-article article (if clear-mark gnus-unread-mark
10876                                        gnus-ticked-mark)))
10877
10878 (defun gnus-summary-mark-as-read-forward (n)
10879   "Mark N articles as read forwards.
10880 If N is negative, mark backwards instead.
10881 The difference between N and the actual number of articles marked is
10882 returned."
10883   (interactive "p")
10884   (gnus-summary-mark-forward n gnus-del-mark gnus-inhibit-user-auto-expire))
10885
10886 (defun gnus-summary-mark-as-read-backward (n)
10887   "Mark the N articles as read backwards.
10888 The difference between N and the actual number of articles marked is
10889 returned."
10890   (interactive "p")
10891   (gnus-summary-mark-forward
10892    (- n) gnus-del-mark gnus-inhibit-user-auto-expire))
10893
10894 (defun gnus-summary-mark-as-read (&optional article mark)
10895   "Mark current article as read.
10896 ARTICLE specifies the article to be marked as read.
10897 MARK specifies a string to be inserted at the beginning of the line."
10898   (gnus-summary-mark-article article mark))
10899
10900 (defun gnus-summary-clear-mark-forward (n)
10901   "Clear marks from N articles forward.
10902 If N is negative, clear backward instead.
10903 The difference between N and the number of marks cleared is returned."
10904   (interactive "p")
10905   (gnus-summary-mark-forward n gnus-unread-mark))
10906
10907 (defun gnus-summary-clear-mark-backward (n)
10908   "Clear marks from N articles backward.
10909 The difference between N and the number of marks cleared is returned."
10910   (interactive "p")
10911   (gnus-summary-mark-forward (- n) gnus-unread-mark))
10912
10913 (defun gnus-summary-mark-unread-as-read ()
10914   "Intended to be used by `gnus-mark-article-hook'."
10915   (when (memq gnus-current-article gnus-newsgroup-unreads)
10916     (gnus-summary-mark-article gnus-current-article gnus-read-mark)))
10917
10918 (defun gnus-summary-mark-read-and-unread-as-read (&optional new-mark)
10919   "Intended to be used by `gnus-mark-article-hook'."
10920   (let ((mark (gnus-summary-article-mark)))
10921     (when (or (gnus-unread-mark-p mark)
10922               (gnus-read-mark-p mark))
10923       (gnus-summary-mark-article gnus-current-article
10924                                  (or new-mark gnus-read-mark)))))
10925
10926 (defun gnus-summary-mark-current-read-and-unread-as-read (&optional new-mark)
10927   "Intended to be used by `gnus-mark-article-hook'."
10928   (let ((mark (gnus-summary-article-mark)))
10929     (when (or (gnus-unread-mark-p mark)
10930               (gnus-read-mark-p mark))
10931       (gnus-summary-mark-article (gnus-summary-article-number)
10932                                  (or new-mark gnus-read-mark)))))
10933
10934 (defun gnus-summary-mark-unread-as-ticked ()
10935   "Intended to be used by `gnus-mark-article-hook'."
10936   (when (memq gnus-current-article gnus-newsgroup-unreads)
10937     (gnus-summary-mark-article gnus-current-article gnus-ticked-mark)))
10938
10939 (defun gnus-summary-mark-region-as-read (point mark all)
10940   "Mark all unread articles between point and mark as read.
10941 If given a prefix, mark all articles between point and mark as read,
10942 even ticked and dormant ones."
10943   (interactive "r\nP")
10944   (save-excursion
10945     (let (article)
10946       (goto-char point)
10947       (beginning-of-line)
10948       (while (and
10949               (< (point) mark)
10950               (progn
10951                 (when (or all
10952                           (memq (setq article (gnus-summary-article-number))
10953                                 gnus-newsgroup-unreads))
10954                   (gnus-summary-mark-article article gnus-del-mark))
10955                 t)
10956               (gnus-summary-find-next))))))
10957
10958 (defun gnus-summary-mark-below (score mark)
10959   "Mark articles with score less than SCORE with MARK."
10960   (interactive "P\ncMark: ")
10961   (setq score (if score
10962                   (prefix-numeric-value score)
10963                 (or gnus-summary-default-score 0)))
10964   (with-current-buffer gnus-summary-buffer
10965     (goto-char (point-min))
10966     (while
10967         (progn
10968           (and (< (gnus-summary-article-score) score)
10969                (gnus-summary-mark-article nil mark))
10970           (gnus-summary-find-next)))))
10971
10972 (defun gnus-summary-kill-below (&optional score)
10973   "Mark articles with score below SCORE as read."
10974   (interactive "P")
10975   (gnus-summary-mark-below score gnus-killed-mark))
10976
10977 (defun gnus-summary-clear-above (&optional score)
10978   "Clear all marks from articles with score above SCORE."
10979   (interactive "P")
10980   (gnus-summary-mark-above score gnus-unread-mark))
10981
10982 (defun gnus-summary-tick-above (&optional score)
10983   "Tick all articles with score above SCORE."
10984   (interactive "P")
10985   (gnus-summary-mark-above score gnus-ticked-mark))
10986
10987 (defun gnus-summary-mark-above (score mark)
10988   "Mark articles with score over SCORE with MARK."
10989   (interactive "P\ncMark: ")
10990   (setq score (if score
10991                   (prefix-numeric-value score)
10992                 (or gnus-summary-default-score 0)))
10993   (with-current-buffer gnus-summary-buffer
10994     (goto-char (point-min))
10995     (while (and (progn
10996                   (when (> (gnus-summary-article-score) score)
10997                     (gnus-summary-mark-article nil mark))
10998                   t)
10999                 (gnus-summary-find-next)))))
11000
11001 ;; Suggested by Daniel Quinlan <quinlan@best.com>.
11002 (defalias 'gnus-summary-show-all-expunged 'gnus-summary-limit-include-expunged)
11003 (defun gnus-summary-limit-include-expunged (&optional no-error)
11004   "Display all the hidden articles that were expunged for low scores."
11005   (interactive)
11006   (let ((inhibit-read-only t))
11007     (let ((scored gnus-newsgroup-scored)
11008           headers h)
11009       (while scored
11010         (unless (gnus-summary-article-header (caar scored))
11011           (and (setq h (gnus-number-to-header (caar scored)))
11012                (< (cdar scored) gnus-summary-expunge-below)
11013                (push h headers)))
11014         (setq scored (cdr scored)))
11015       (if (not headers)
11016           (when (not no-error)
11017             (error "No expunged articles hidden"))
11018         (goto-char (point-min))
11019         (push gnus-newsgroup-limit gnus-newsgroup-limits)
11020         (setq gnus-newsgroup-limit (copy-sequence gnus-newsgroup-limit))
11021         (dolist (x headers)
11022           (push (mail-header-number x) gnus-newsgroup-limit))
11023         (gnus-summary-prepare-unthreaded (nreverse headers))
11024         (goto-char (point-min))
11025         (gnus-summary-position-point)
11026         t))))
11027
11028 (defun gnus-summary-catchup (&optional all quietly to-here not-mark reverse)
11029   "Mark all unread articles in this newsgroup as read.
11030 If prefix argument ALL is non-nil, ticked and dormant articles will
11031 also be marked as read.
11032 If QUIETLY is non-nil, no questions will be asked.
11033
11034 If TO-HERE is non-nil, it should be a point in the buffer.  All
11035 articles before (after, if REVERSE is set) this point will be marked
11036 as read.
11037
11038 Note that this function will only catch up the unread article
11039 in the current summary buffer limitation.
11040
11041 The number of articles marked as read is returned."
11042   (interactive "P")
11043   (prog1
11044       (save-excursion
11045         (when (or quietly
11046                   (not gnus-interactive-catchup) ;Without confirmation?
11047                   gnus-expert-user
11048                   (gnus-y-or-n-p
11049                    (if all
11050                        "Mark absolutely all articles as read? "
11051                      "Mark all unread articles as read? ")))
11052           (if (and not-mark
11053                    (not gnus-newsgroup-adaptive)
11054                    (not gnus-newsgroup-auto-expire)
11055                    (not gnus-suppress-duplicates)
11056                    (or (not gnus-use-cache)
11057                        (eq gnus-use-cache 'passive)))
11058               (progn
11059                 (when all
11060                   (setq gnus-newsgroup-marked nil
11061                         gnus-newsgroup-spam-marked nil
11062                         gnus-newsgroup-dormant nil))
11063                 (setq gnus-newsgroup-unreads
11064                       (gnus-sorted-nunion
11065                        (gnus-sorted-intersection gnus-newsgroup-unreads
11066                                                  gnus-newsgroup-downloadable)
11067                        (gnus-sorted-difference gnus-newsgroup-unfetched
11068                                                gnus-newsgroup-cached))))
11069             ;; We actually mark all articles as canceled, which we
11070             ;; have to do when using auto-expiry or adaptive scoring.
11071             (gnus-summary-show-all-threads)
11072             (if (and to-here reverse)
11073                 (progn
11074                   (goto-char to-here)
11075                   (gnus-summary-mark-current-read-and-unread-as-read
11076                    gnus-catchup-mark)
11077                   (while (gnus-summary-find-next (not all))
11078                     (gnus-summary-mark-article-as-read gnus-catchup-mark)))
11079               (when (gnus-summary-first-subject (not all))
11080                 (while (and
11081                         (if to-here (< (point) to-here) t)
11082                         (gnus-summary-mark-article-as-read gnus-catchup-mark)
11083                         (gnus-summary-find-next (not all))))))
11084             (gnus-set-mode-line 'summary))
11085           t))
11086     (gnus-summary-position-point)))
11087
11088 (defun gnus-summary-catchup-to-here (&optional all)
11089   "Mark all unticked articles before the current one as read.
11090 If ALL is non-nil, also mark ticked and dormant articles as read."
11091   (interactive "P")
11092   (save-excursion
11093     (gnus-save-hidden-threads
11094       (let ((beg (point)))
11095         ;; We check that there are unread articles.
11096         (when (or all (gnus-summary-find-prev))
11097           (gnus-summary-catchup all t beg)))))
11098   (gnus-summary-position-point))
11099
11100 (defun gnus-summary-catchup-from-here (&optional all)
11101   "Mark all unticked articles after (and including) the current one as read.
11102 If ALL is non-nil, also mark ticked and dormant articles as read."
11103   (interactive "P")
11104   (save-excursion
11105     (gnus-save-hidden-threads
11106       (let ((beg (point)))
11107         ;; We check that there are unread articles.
11108         (when (or all (gnus-summary-find-next))
11109           (gnus-summary-catchup all t beg nil t)))))
11110   (gnus-summary-position-point))
11111
11112 (defun gnus-summary-catchup-all (&optional quietly)
11113   "Mark all articles in this newsgroup as read.
11114 This command is dangerous.  Normally, you want \\[gnus-summary-catchup]
11115 instead, which marks only unread articles as read."
11116   (interactive "P")
11117   (gnus-summary-catchup t quietly))
11118
11119 (defun gnus-summary-catchup-and-exit (&optional all quietly)
11120   "Mark all unread articles in this group as read, then exit.
11121 If prefix argument ALL is non-nil, all articles are marked as read.
11122 If QUIETLY is non-nil, no questions will be asked."
11123   (interactive "P")
11124   (when (gnus-summary-catchup all quietly nil 'fast)
11125     ;; Select next newsgroup or exit.
11126     (if (and (not (gnus-group-quit-config gnus-newsgroup-name))
11127              (eq gnus-auto-select-next 'quietly))
11128         (gnus-summary-next-group nil)
11129       (gnus-summary-exit))))
11130
11131 (defun gnus-summary-catchup-all-and-exit (&optional quietly)
11132   "Mark all articles in this newsgroup as read, and then exit.
11133 This command is dangerous.  Normally, you want \\[gnus-summary-catchup-and-exit]
11134 instead, which marks only unread articles as read."
11135   (interactive "P")
11136   (gnus-summary-catchup-and-exit t quietly))
11137
11138 (defun gnus-summary-catchup-and-goto-next-group (&optional all)
11139   "Mark all articles in this group as read and select the next group.
11140 If given a prefix, mark all articles, unread as well as ticked, as
11141 read."
11142   (interactive "P")
11143   (save-excursion
11144     (gnus-summary-catchup all))
11145   (gnus-summary-next-group))
11146
11147 (defun gnus-summary-catchup-and-goto-prev-group (&optional all)
11148   "Mark all articles in this group as read and select the previous group.
11149 If given a prefix, mark all articles, unread as well as ticked, as
11150 read."
11151   (interactive "P")
11152   (save-excursion
11153     (gnus-summary-catchup all))
11154   (gnus-summary-next-group nil nil t))
11155
11156 ;;;
11157 ;;; with article
11158 ;;;
11159
11160 (defmacro gnus-with-article (article &rest forms)
11161   "Select ARTICLE and perform FORMS in the original article buffer.
11162 Then replace the article with the result."
11163   `(progn
11164      ;; We don't want the article to be marked as read.
11165      (let (gnus-mark-article-hook)
11166        (gnus-summary-select-article t t nil ,article))
11167      (set-buffer gnus-original-article-buffer)
11168      ,@forms
11169      (if (not (gnus-check-backend-function
11170                'request-replace-article (car gnus-article-current)))
11171          (gnus-message 5 "Read-only group; not replacing")
11172        (unless (gnus-request-replace-article
11173                 ,article (car gnus-article-current)
11174                 (current-buffer) t)
11175          (error "Couldn't replace article")))
11176      ;; The cache and backlog have to be flushed somewhat.
11177      (when gnus-keep-backlog
11178        (gnus-backlog-remove-article
11179         (car gnus-article-current) (cdr gnus-article-current)))
11180      (when gnus-use-cache
11181        (gnus-cache-update-article
11182         (car gnus-article-current) (cdr gnus-article-current)))))
11183
11184 (put 'gnus-with-article 'lisp-indent-function 1)
11185 (put 'gnus-with-article 'edebug-form-spec '(form body))
11186
11187 ;; Thread-based commands.
11188
11189 (defun gnus-summary-articles-in-thread (&optional article)
11190   "Return a list of all articles in the current thread.
11191 If ARTICLE is non-nil, return all articles in the thread that starts
11192 with that article."
11193   (let* ((article (or article (gnus-summary-article-number)))
11194          (data (gnus-data-find-list article))
11195          (top-level (gnus-data-level (car data)))
11196          (top-subject
11197           (cond ((null gnus-thread-operation-ignore-subject)
11198                  (gnus-simplify-subject-re
11199                   (mail-header-subject (gnus-data-header (car data)))))
11200                 ((eq gnus-thread-operation-ignore-subject 'fuzzy)
11201                  (gnus-simplify-subject-fuzzy
11202                   (mail-header-subject (gnus-data-header (car data)))))
11203                 (t nil)))
11204          (end-point (save-excursion
11205                       (if (gnus-summary-go-to-next-thread)
11206                           (point) (point-max))))
11207          articles)
11208     (while (and data
11209                 (< (gnus-data-pos (car data)) end-point))
11210       (when (or (not top-subject)
11211                 (string= top-subject
11212                          (if (eq gnus-thread-operation-ignore-subject 'fuzzy)
11213                              (gnus-simplify-subject-fuzzy
11214                               (mail-header-subject
11215                                (gnus-data-header (car data))))
11216                            (gnus-simplify-subject-re
11217                             (mail-header-subject
11218                              (gnus-data-header (car data)))))))
11219         (push (gnus-data-number (car data)) articles))
11220       (unless (and (setq data (cdr data))
11221                    (> (gnus-data-level (car data)) top-level))
11222         (setq data nil)))
11223     ;; Return the list of articles.
11224     (nreverse articles)))
11225
11226 (defun gnus-summary-rethread-current ()
11227   "Rethread the thread the current article is part of."
11228   (interactive)
11229   (let* ((gnus-show-threads t)
11230          (article (gnus-summary-article-number))
11231          (id (mail-header-id (gnus-summary-article-header)))
11232          (gnus-newsgroup-threads (list (gnus-id-to-thread (gnus-root-id id)))))
11233     (unless id
11234       (error "No article on the current line"))
11235     (gnus-rebuild-thread id)
11236     (gnus-summary-goto-subject article)))
11237
11238 (defun gnus-summary-reparent-thread ()
11239   "Make the current article child of the marked (or previous) article.
11240
11241 Note that the re-threading will only work if `gnus-thread-ignore-subject'
11242 is non-nil or the Subject: of both articles are the same."
11243   (interactive)
11244   (unless (not (gnus-group-read-only-p))
11245     (error "The current newsgroup does not support article editing"))
11246   (unless (<= (length gnus-newsgroup-processable) 1)
11247     (error "No more than one article may be marked"))
11248   (let ((child (gnus-summary-article-number))
11249         ;; First grab the marked article, otherwise one line up.
11250         (parent (if (not (null gnus-newsgroup-processable))
11251                     (car gnus-newsgroup-processable)
11252                   (save-excursion
11253                     (if (eq (forward-line -1) 0)
11254                         (gnus-summary-article-number)
11255                       (error "Beginning of summary buffer"))))))
11256     (gnus-summary-reparent-children parent (list child))))
11257
11258 (defun gnus-summary-reparent-children (parent children)
11259   "Make PARENT the parent of CHILDREN.
11260 When called interactively, PARENT is the current article and CHILDREN
11261 are the process-marked articles."
11262   (interactive
11263    (list (gnus-summary-article-number)
11264          (gnus-summary-work-articles nil)))
11265   (dolist (child children)
11266     (save-window-excursion
11267       (let ((gnus-article-buffer " *reparent*"))
11268         (unless (not (eq parent child))
11269           (error "An article may not be self-referential"))
11270         (let ((message-id (mail-header-id
11271                            (gnus-summary-article-header parent))))
11272           (unless (and message-id (not (equal message-id "")))
11273             (error "No message-id in desired parent"))
11274           (gnus-with-article child
11275             (save-restriction
11276               (goto-char (point-min))
11277               (message-narrow-to-head)
11278               (if (re-search-forward "^References: " nil t)
11279                   (progn
11280                     (re-search-forward "^[^ \t]" nil t)
11281                     (forward-line -1)
11282                     (end-of-line)
11283                     (insert " " message-id))
11284                 (insert "References: " message-id "\n"))))
11285           (set-buffer gnus-summary-buffer)
11286           (gnus-summary-unmark-all-processable)
11287           (gnus-summary-update-article child)
11288           (when (gnus-summary-goto-subject (cdr gnus-article-current) nil t)
11289             (gnus-summary-update-secondary-mark (cdr gnus-article-current)))
11290           (gnus-summary-rethread-current)
11291           (gnus-message 3 "Article %d is now the child of article %d"
11292                         child parent))))))
11293
11294 (defun gnus-summary-toggle-threads (&optional arg)
11295   "Toggle showing conversation threads.
11296 If ARG is positive number, turn showing conversation threads on."
11297   (interactive "P")
11298   (let ((current (or (gnus-summary-article-number) gnus-newsgroup-end)))
11299     (setq gnus-show-threads
11300           (if (null arg) (not gnus-show-threads)
11301             (> (prefix-numeric-value arg) 0)))
11302     (gnus-summary-prepare)
11303     (gnus-summary-goto-subject current)
11304     (gnus-message 6 "Threading is now %s" (if gnus-show-threads "on" "off"))
11305     (gnus-summary-position-point)))
11306
11307 (eval-and-compile
11308   (if (fboundp 'remove-overlays)
11309       (defalias 'gnus-remove-overlays 'remove-overlays)
11310     (defun gnus-remove-overlays (beg end name val)
11311       "Clear BEG and END of overlays whose property NAME has value VAL.
11312 For compatibility with Emacs 21 and XEmacs."
11313       (dolist (ov (gnus-overlays-in beg end))
11314         (when (eq (gnus-overlay-get ov name) val)
11315           (gnus-delete-overlay ov))))))
11316
11317 (defun gnus-summary-show-all-threads ()
11318   "Show all threads."
11319   (interactive)
11320   (gnus-remove-overlays (point-min) (point-max) 'invisible 'gnus-sum)
11321   (gnus-summary-position-point))
11322
11323 (defun gnus-summary-show-thread ()
11324   "Show thread subtrees.
11325 Returns nil if no thread was there to be shown."
11326   (interactive)
11327   (let* ((orig (point))
11328          (end (point-at-eol))
11329          ;; Leave point at bol
11330          (beg (progn (beginning-of-line) (if (bobp) (point) (1- (point)))))
11331          (eoi (when (eq (get-char-property end 'invisible) 'gnus-sum)
11332                 (if (fboundp 'next-single-char-property-change)
11333                     (or (next-single-char-property-change end 'invisible)
11334                         (point-max))
11335                   (while (progn
11336                            (end-of-line 2)
11337                            (and (not (eobp))
11338                                 (eq (get-char-property (point) 'invisible)
11339                                     'gnus-sum))))
11340                   (point)))))
11341     (when eoi
11342       (gnus-remove-overlays beg eoi 'invisible 'gnus-sum)
11343       (goto-char orig)
11344       (gnus-summary-position-point)
11345       eoi)))
11346
11347 (defun gnus-summary-maybe-hide-threads ()
11348   "If requested, hide the threads that should be hidden."
11349   (when (and gnus-show-threads
11350              gnus-thread-hide-subtree)
11351     (gnus-summary-hide-all-threads
11352      (if (or (consp gnus-thread-hide-subtree)
11353              (functionp gnus-thread-hide-subtree))
11354          (gnus-make-predicate gnus-thread-hide-subtree)
11355        nil))))
11356
11357 ;;; Hiding predicates.
11358
11359 (defun gnus-article-unread-p (header)
11360   (memq (mail-header-number header) gnus-newsgroup-unreads))
11361
11362 (defun gnus-article-unseen-p (header)
11363   (memq (mail-header-number header) gnus-newsgroup-unseen))
11364
11365 (defun gnus-map-articles (predicate articles)
11366   "Map PREDICATE over ARTICLES and return non-nil if any predicate is non-nil."
11367   (apply 'gnus-or (mapcar predicate
11368                           (mapcar (lambda (number)
11369                                     (gnus-summary-article-header number))
11370                                   articles))))
11371
11372 (defun gnus-summary-hide-all-threads (&optional predicate)
11373   "Hide all thread subtrees.
11374 If PREDICATE is supplied, threads that satisfy this predicate
11375 will not be hidden."
11376   (interactive)
11377   (save-excursion
11378     (goto-char (point-min))
11379     (let ((end nil))
11380       (while (not end)
11381         (when (or (not predicate)
11382                   (gnus-map-articles
11383                    predicate (gnus-summary-article-children)))
11384             (gnus-summary-hide-thread))
11385         (setq end (not (zerop (gnus-summary-next-thread 1 t)))))))
11386   (gnus-summary-position-point))
11387
11388 (defun gnus-summary-hide-thread ()
11389   "Hide thread subtrees.
11390 If PREDICATE is supplied, threads that satisfy this predicate
11391 will not be hidden.
11392 Returns nil if no threads were there to be hidden."
11393   (interactive)
11394   (let ((start (point))
11395         (starteol (line-end-position))
11396         (article (gnus-summary-article-number)))
11397     (goto-char start)
11398     ;; Go forward until either the buffer ends or the subthread ends.
11399     (when (and (not (eobp))
11400                (or (zerop (gnus-summary-next-thread 1 t))
11401                    (goto-char (point-max))))
11402       (if (and (> (point) start)
11403                ;; FIXME: this should actually search for a non-invisible \n.
11404                (search-backward "\n" start t))
11405           (progn
11406             (when (> (point) starteol)
11407               (gnus-remove-overlays starteol (point) 'invisible 'gnus-sum)
11408               (let ((ol (gnus-make-overlay starteol (point) nil t nil)))
11409                 (gnus-overlay-put ol 'invisible 'gnus-sum)
11410                 (gnus-overlay-put ol 'evaporate t)))
11411             (gnus-summary-goto-subject article))
11412         (goto-char start)
11413         nil))))
11414
11415 (defun gnus-summary-go-to-next-thread (&optional previous)
11416   "Go to the same level (or less) next thread.
11417 If PREVIOUS is non-nil, go to previous thread instead.
11418 Return the article number moved to, or nil if moving was impossible."
11419   (let ((level (gnus-summary-thread-level))
11420         (way (if previous -1 1))
11421         (beg (point)))
11422     (forward-line way)
11423     (while (and (not (eobp))
11424                 (< level (gnus-summary-thread-level)))
11425       (forward-line way))
11426     (if (eobp)
11427         (progn
11428           (goto-char beg)
11429           nil)
11430       (setq beg (point))
11431       (prog1
11432           (gnus-summary-article-number)
11433         (goto-char beg)))))
11434
11435 (defun gnus-summary-next-thread (n &optional silent)
11436   "Go to the same level next N'th thread.
11437 If N is negative, search backward instead.
11438 Returns the difference between N and the number of skips actually
11439 done.
11440
11441 If SILENT, don't output messages."
11442   (interactive "p")
11443   (let ((backward (< n 0))
11444         (n (abs n)))
11445     (while (and (> n 0)
11446                 (gnus-summary-go-to-next-thread backward))
11447       (decf n))
11448     (unless silent
11449       (gnus-summary-position-point))
11450     (when (and (not silent) (/= 0 n))
11451       (gnus-message 7 "No more threads"))
11452     n))
11453
11454 (defun gnus-summary-prev-thread (n)
11455   "Go to the same level previous N'th thread.
11456 Returns the difference between N and the number of skips actually
11457 done."
11458   (interactive "p")
11459   (gnus-summary-next-thread (- n)))
11460
11461 (defun gnus-summary-go-down-thread ()
11462   "Go down one level in the current thread."
11463   (let ((children (gnus-summary-article-children)))
11464     (when children
11465       (gnus-summary-goto-subject (car children)))))
11466
11467 (defun gnus-summary-go-up-thread ()
11468   "Go up one level in the current thread."
11469   (let ((parent (gnus-summary-article-parent)))
11470     (when parent
11471       (gnus-summary-goto-subject parent))))
11472
11473 (defun gnus-summary-down-thread (n)
11474   "Go down thread N steps.
11475 If N is negative, go up instead.
11476 Returns the difference between N and how many steps down that were
11477 taken."
11478   (interactive "p")
11479   (let ((up (< n 0))
11480         (n (abs n)))
11481     (while (and (> n 0)
11482                 (if up (gnus-summary-go-up-thread)
11483                   (gnus-summary-go-down-thread)))
11484       (setq n (1- n)))
11485     (gnus-summary-position-point)
11486     (when (/= 0 n)
11487       (gnus-message 7 "Can't go further"))
11488     n))
11489
11490 (defun gnus-summary-up-thread (n)
11491   "Go up thread N steps.
11492 If N is negative, go down instead.
11493 Returns the difference between N and how many steps down that were
11494 taken."
11495   (interactive "p")
11496   (gnus-summary-down-thread (- n)))
11497
11498 (defun gnus-summary-top-thread ()
11499   "Go to the top of the thread."
11500   (interactive)
11501   (while (gnus-summary-go-up-thread))
11502   (gnus-summary-article-number))
11503
11504 (defun gnus-summary-expire-thread ()
11505   "Mark articles under current thread as expired."
11506   (interactive)
11507   (gnus-summary-kill-thread 0))
11508
11509 (defun gnus-summary-kill-thread (&optional unmark)
11510   "Mark articles under current thread as read.
11511 If the prefix argument is positive, remove any kinds of marks.
11512 If the prefix argument is zero, mark thread as expired.
11513 If the prefix argument is negative, tick articles instead."
11514   (interactive "P")
11515   (when unmark
11516     (setq unmark (prefix-numeric-value unmark)))
11517   (let ((articles (gnus-summary-articles-in-thread))
11518         (hide (or (null unmark) (= unmark 0))))
11519     (save-excursion
11520       ;; Expand the thread.
11521       (gnus-summary-show-thread)
11522       ;; Mark all the articles.
11523       (while articles
11524         (gnus-summary-goto-subject (car articles))
11525         (cond ((null unmark)
11526                (gnus-summary-mark-article-as-read gnus-killed-mark))
11527               ((> unmark 0)
11528                (gnus-summary-mark-article-as-unread gnus-unread-mark))
11529               ((= unmark 0)
11530                (gnus-summary-mark-article-as-unread gnus-expirable-mark))
11531               (t
11532                (gnus-summary-mark-article-as-unread gnus-ticked-mark)))
11533         (setq articles (cdr articles))))
11534     ;; Hide killed subtrees when hide is true.
11535     (and hide
11536          gnus-thread-hide-killed
11537          (gnus-summary-hide-thread))
11538     ;; If hide is t, go to next unread subject.
11539     (when hide
11540       ;; Go to next unread subject.
11541       (gnus-summary-next-subject 1 t)))
11542   (gnus-set-mode-line 'summary))
11543
11544 ;; Summary sorting commands
11545
11546 (defun gnus-summary-sort-by-number (&optional reverse)
11547   "Sort the summary buffer by article number.
11548 Argument REVERSE means reverse order."
11549   (interactive "P")
11550   (gnus-summary-sort 'number reverse))
11551
11552 (defun gnus-summary-sort-by-most-recent-number (&optional reverse)
11553   "Sort the summary buffer by most recent article number.
11554 Argument REVERSE means reverse order."
11555   (interactive "P")
11556   (gnus-summary-sort 'most-recent-number reverse))
11557
11558 (defun gnus-summary-sort-by-random (&optional reverse)
11559   "Randomize the order in the summary buffer.
11560 Argument REVERSE means to randomize in reverse order."
11561   (interactive "P")
11562   (gnus-summary-sort 'random reverse))
11563
11564 (defun gnus-summary-sort-by-author (&optional reverse)
11565   "Sort the summary buffer by author name alphabetically.
11566 If `case-fold-search' is non-nil, case of letters is ignored.
11567 Argument REVERSE means reverse order."
11568   (interactive "P")
11569   (gnus-summary-sort 'author reverse))
11570
11571 (defun gnus-summary-sort-by-recipient (&optional reverse)
11572   "Sort the summary buffer by recipient name alphabetically.
11573 If `case-fold-search' is non-nil, case of letters is ignored.
11574 Argument REVERSE means reverse order."
11575   (interactive "P")
11576   (gnus-summary-sort 'recipient reverse))
11577
11578 (defun gnus-summary-sort-by-subject (&optional reverse)
11579   "Sort the summary buffer by subject alphabetically.  `Re:'s are ignored.
11580 If `case-fold-search' is non-nil, case of letters is ignored.
11581 Argument REVERSE means reverse order."
11582   (interactive "P")
11583   (gnus-summary-sort 'subject reverse))
11584
11585 (defun gnus-summary-sort-by-date (&optional reverse)
11586   "Sort the summary buffer by date.
11587 Argument REVERSE means reverse order."
11588   (interactive "P")
11589   (gnus-summary-sort 'date reverse))
11590
11591 (defun gnus-summary-sort-by-most-recent-date (&optional reverse)
11592   "Sort the summary buffer by most recent date.
11593 Argument REVERSE means reverse order."
11594   (interactive "P")
11595   (gnus-summary-sort 'most-recent-date reverse))
11596
11597 (defun gnus-summary-sort-by-score (&optional reverse)
11598   "Sort the summary buffer by score.
11599 Argument REVERSE means reverse order."
11600   (interactive "P")
11601   (gnus-summary-sort 'score reverse))
11602
11603 (defun gnus-summary-sort-by-lines (&optional reverse)
11604   "Sort the summary buffer by the number of lines.
11605 Argument REVERSE means reverse order."
11606   (interactive "P")
11607   (gnus-summary-sort 'lines reverse))
11608
11609 (defun gnus-summary-sort-by-chars (&optional reverse)
11610   "Sort the summary buffer by article length.
11611 Argument REVERSE means reverse order."
11612   (interactive "P")
11613   (gnus-summary-sort 'chars reverse))
11614
11615 (defun gnus-summary-sort-by-original (&optional reverse)
11616   "Sort the summary buffer using the default sorting method.
11617 Argument REVERSE means reverse order."
11618   (interactive "P")
11619   (let* ((inhibit-read-only t)
11620          (gnus-summary-prepare-hook nil))
11621     ;; We do the sorting by regenerating the threads.
11622     (gnus-summary-prepare)
11623     ;; Hide subthreads if needed.
11624     (gnus-summary-maybe-hide-threads)))
11625
11626 (defun gnus-summary-sort (predicate reverse)
11627   "Sort summary buffer by PREDICATE.  REVERSE means reverse order."
11628   (let* ((thread (intern (format "gnus-thread-sort-by-%s" predicate)))
11629          (article (intern (format "gnus-article-sort-by-%s" predicate)))
11630          (gnus-thread-sort-functions
11631           (if (not reverse)
11632               thread
11633             `(lambda (t1 t2)
11634                (,thread t2 t1))))
11635          (gnus-sort-gathered-threads-function
11636           gnus-thread-sort-functions)
11637          (gnus-article-sort-functions
11638           (if (not reverse)
11639               article
11640             `(lambda (t1 t2)
11641                (,article t2 t1))))
11642          (inhibit-read-only t)
11643          (gnus-summary-prepare-hook nil))
11644     ;; We do the sorting by regenerating the threads.
11645     (gnus-summary-prepare)
11646     ;; Hide subthreads if needed.
11647     (gnus-summary-maybe-hide-threads)))
11648
11649 ;; Summary saving commands.
11650
11651 (defun gnus-summary-save-article (&optional n not-saved)
11652   "Save the current article using the default saver function.
11653 If N is a positive number, save the N next articles.
11654 If N is a negative number, save the N previous articles.
11655 If N is nil and any articles have been marked with the process mark,
11656 save those articles instead.
11657 The variable `gnus-default-article-saver' specifies the saver function.
11658
11659 If the optional second argument NOT-SAVED is non-nil, articles saved
11660 will not be marked as saved."
11661   (interactive "P")
11662   (require 'gnus-art)
11663   (let* ((articles (gnus-summary-work-articles n))
11664          (save-buffer (save-excursion
11665                         (nnheader-set-temp-buffer " *Gnus Save*")))
11666          (num (length articles))
11667          ;; Whether to save decoded articles or raw articles.
11668          (decode (when gnus-article-save-coding-system
11669                    (get gnus-default-article-saver :decode)))
11670          ;; When saving many articles in a single file, use the other
11671          ;; function to save articles other than the first one.
11672          (saver2 (get gnus-default-article-saver :function))
11673          (gnus-prompt-before-saving (if saver2
11674                                         t
11675                                       gnus-prompt-before-saving))
11676          (gnus-default-article-saver gnus-default-article-saver)
11677          header file)
11678     (dolist (article articles)
11679       (setq header (gnus-summary-article-header article))
11680       (if (not (vectorp header))
11681           ;; This is a pseudo-article.
11682           (if (assq 'name header)
11683               (gnus-copy-file (cdr (assq 'name header)))
11684             (gnus-message 1 "Article %d is unsaveable" article))
11685         ;; This is a real article.
11686         (save-window-excursion
11687           (let ((gnus-display-mime-function (when decode
11688                                               gnus-display-mime-function))
11689                 (gnus-article-prepare-hook (when decode
11690                                              gnus-article-prepare-hook)))
11691             (gnus-summary-select-article t t nil article)
11692             (gnus-summary-goto-subject article)))
11693         (with-current-buffer save-buffer
11694           (erase-buffer)
11695           (insert-buffer-substring (if decode
11696                                        gnus-article-buffer
11697                                      gnus-original-article-buffer)))
11698         (setq file (gnus-article-save save-buffer file num))
11699         (gnus-summary-remove-process-mark article)
11700         (unless not-saved
11701           (gnus-summary-set-saved-mark article)))
11702       (when saver2
11703         (setq gnus-default-article-saver saver2
11704               saver2 nil)))
11705     (gnus-kill-buffer save-buffer)
11706     (gnus-summary-position-point)
11707     (gnus-set-mode-line 'summary)
11708     n))
11709
11710 (defun gnus-summary-pipe-output (&optional n sym)
11711   "Pipe the current article to a subprocess.
11712 If N is a positive number, pipe the N next articles.
11713 If N is a negative number, pipe the N previous articles.
11714 If N is nil and any articles have been marked with the process mark,
11715 pipe those articles instead.
11716 The default command to which articles are piped is specified by the
11717 variable `gnus-summary-pipe-output-default-command'; if it is nil, you
11718 will be prompted for the command.
11719
11720 The properties `:decode' and `:headers' that are put to the function
11721 symbol `gnus-summary-save-in-pipe' control whether this function
11722 decodes articles and what headers to keep (see the doc string for the
11723 `gnus-default-article-saver' variable).  If SYM (the symbolic prefix)
11724 is neither omitted nor the symbol `r', force including all headers
11725 regardless of the `:headers' property.  If it is the symbol `r',
11726 articles that are not decoded and include all headers will be piped
11727 no matter what the properties `:decode' and `:headers' are."
11728   (interactive (gnus-interactive "P\ny"))
11729   (require 'gnus-art)
11730   (let* ((articles (gnus-summary-work-articles n))
11731          (result-buffer "*Shell Command Output*")
11732          (all-headers (not (memq sym '(nil r))))
11733          (gnus-save-all-headers (or all-headers gnus-save-all-headers))
11734          (raw (eq sym 'r))
11735          (headers (get 'gnus-summary-save-in-pipe :headers))
11736          command result)
11737     (unless (numberp (car articles))
11738       (error "No article to pipe"))
11739     (setq command (gnus-read-shell-command
11740                    (concat "Shell command on "
11741                            (if (cdr articles)
11742                                (format "these %d articles" (length articles))
11743                              "this article")
11744                            ": ")
11745                    gnus-summary-pipe-output-default-command))
11746     (when (string-equal command "")
11747       (error "A command is required"))
11748     (when all-headers
11749       (put 'gnus-summary-save-in-pipe :headers nil))
11750     (unwind-protect
11751         (while articles
11752           (gnus-summary-goto-subject (pop articles))
11753           (save-window-excursion (gnus-summary-save-in-pipe command raw))
11754           (when (and (get-buffer result-buffer)
11755                      (not (zerop (buffer-size (get-buffer result-buffer)))))
11756             (setq result (concat result (with-current-buffer result-buffer
11757                                           (buffer-string))))))
11758       (put 'gnus-summary-save-in-pipe :headers headers))
11759     (unless (zerop (length result))
11760       (if (with-current-buffer (get-buffer-create result-buffer)
11761             (erase-buffer)
11762             (insert result)
11763             (prog1
11764                 (and (= (count-lines (point-min) (point)) 1)
11765                      (progn
11766                        (end-of-line 0)
11767                        (<= (current-column)
11768                            (window-width (minibuffer-window)))))
11769               (goto-char (point-min))))
11770           (message "%s" (substring result 0 -1))
11771         (message nil)
11772         (gnus-configure-windows 'pipe)))))
11773
11774 (defun gnus-summary-save-article-mail (&optional arg)
11775   "Append the current article to a Unix mail box file.
11776 If N is a positive number, save the N next articles.
11777 If N is a negative number, save the N previous articles.
11778 If N is nil and any articles have been marked with the process mark,
11779 save those articles instead."
11780   (interactive "P")
11781   (require 'gnus-art)
11782   (let ((gnus-default-article-saver 'gnus-summary-save-in-mail))
11783     (gnus-summary-save-article arg)))
11784
11785 (defun gnus-summary-save-article-rmail (&optional arg)
11786   "Append the current article to an rmail file.
11787 If N is a positive number, save the N next articles.
11788 If N is a negative number, save the N previous articles.
11789 If N is nil and any articles have been marked with the process mark,
11790 save those articles instead."
11791   (interactive "P")
11792   (require 'gnus-art)
11793   (let ((gnus-default-article-saver 'gnus-summary-save-in-rmail))
11794     (gnus-summary-save-article arg)))
11795
11796 (defun gnus-summary-save-article-file (&optional arg)
11797   "Append the current article to a file.
11798 If N is a positive number, save the N next articles.
11799 If N is a negative number, save the N previous articles.
11800 If N is nil and any articles have been marked with the process mark,
11801 save those articles instead."
11802   (interactive "P")
11803   (require 'gnus-art)
11804   (let ((gnus-default-article-saver 'gnus-summary-save-in-file))
11805     (gnus-summary-save-article arg)))
11806
11807 (defun gnus-summary-write-article-file (&optional arg)
11808   "Write the current article to a file, deleting the previous file.
11809 If N is a positive number, save the N next articles.
11810 If N is a negative number, save the N previous articles.
11811 If N is nil and any articles have been marked with the process mark,
11812 save those articles instead."
11813   (interactive "P")
11814   (require 'gnus-art)
11815   (let ((gnus-default-article-saver 'gnus-summary-write-to-file))
11816     (gnus-summary-save-article arg)))
11817
11818 (defun gnus-summary-save-article-body-file (&optional arg)
11819   "Append the current article body to a file.
11820 If N is a positive number, save the N next articles.
11821 If N is a negative number, save the N previous articles.
11822 If N is nil and any articles have been marked with the process mark,
11823 save those articles instead."
11824   (interactive "P")
11825   (require 'gnus-art)
11826   (let ((gnus-default-article-saver 'gnus-summary-save-body-in-file))
11827     (gnus-summary-save-article arg)))
11828
11829 (defun gnus-summary-write-article-body-file (&optional arg)
11830   "Write the current article body to a file, deleting the previous file.
11831 If N is a positive number, save the N next articles.
11832 If N is a negative number, save the N previous articles.
11833 If N is nil and any articles have been marked with the process mark,
11834 save those articles instead."
11835   (interactive "P")
11836   (require 'gnus-art)
11837   (let ((gnus-default-article-saver 'gnus-summary-write-body-to-file))
11838     (gnus-summary-save-article arg)))
11839
11840 (defun gnus-summary-muttprint (&optional arg)
11841   "Print the current article using Muttprint.
11842 If N is a positive number, save the N next articles.
11843 If N is a negative number, save the N previous articles.
11844 If N is nil and any articles have been marked with the process mark,
11845 save those articles instead."
11846   (interactive "P")
11847   (require 'gnus-art)
11848   (let ((gnus-default-article-saver 'gnus-summary-pipe-to-muttprint))
11849     (gnus-summary-save-article arg t)))
11850
11851 (defun gnus-summary-pipe-message (program)
11852   "Pipe the current article through PROGRAM."
11853   (interactive "sProgram: ")
11854   (gnus-summary-select-article)
11855   (let ((mail-header-separator ""))
11856     (gnus-eval-in-buffer-window gnus-article-buffer
11857       (save-restriction
11858         (widen)
11859         (let ((start (window-start))
11860               (inhibit-read-only t))
11861           (message-pipe-buffer-body program)
11862           (set-window-start (get-buffer-window (current-buffer)) start))))))
11863
11864 (defun gnus-get-split-value (methods)
11865   "Return a value based on the split METHODS."
11866   (let (split-name method result match)
11867     (when methods
11868       (with-current-buffer gnus-original-article-buffer
11869         (save-restriction
11870           (nnheader-narrow-to-headers)
11871           (while (and methods (not split-name))
11872             (goto-char (point-min))
11873             (setq method (pop methods))
11874             (setq match (car method))
11875             (when (cond
11876                    ((stringp match)
11877                     ;; Regular expression.
11878                     (ignore-errors
11879                       (re-search-forward match nil t)))
11880                    ((functionp match)
11881                     ;; Function.
11882                     (save-restriction
11883                       (widen)
11884                       (setq result (funcall match gnus-newsgroup-name))))
11885                    ((consp match)
11886                     ;; Form.
11887                     (save-restriction
11888                       (widen)
11889                       (setq result (eval match)))))
11890               (setq split-name (cdr method))
11891               (cond ((stringp result)
11892                      (push (expand-file-name
11893                             result gnus-article-save-directory)
11894                            split-name))
11895                     ((consp result)
11896                      (setq split-name (append result split-name)))))))))
11897     (nreverse split-name)))
11898
11899 (defun gnus-valid-move-group-p (group)
11900   (and (boundp group)
11901        (symbol-name group)
11902        (symbol-value group)
11903        (gnus-get-function (gnus-find-method-for-group
11904                            (symbol-name group)) 'request-accept-article t)))
11905
11906 (defun gnus-read-move-group-name (prompt default articles prefix)
11907   "Read a group name."
11908   (let* ((split-name (gnus-get-split-value gnus-move-split-methods))
11909          (minibuffer-confirm-incomplete nil) ; XEmacs
11910          (prom
11911           (format "%s %s to"
11912                   prompt
11913                   (if (> (length articles) 1)
11914                       (format "these %d articles" (length articles))
11915                     "this article")))
11916          (to-newsgroup
11917           (let (active group)
11918             (when (or (null split-name) (= 1 (length split-name)))
11919               (setq active (gnus-make-hashtable (length gnus-active-hashtb)))
11920               (mapatoms (lambda (symbol)
11921                           (setq group (symbol-name symbol))
11922                           (when (string-match "[^\000-\177]" group)
11923                             (setq group (gnus-group-decoded-name group)))
11924                           (set (intern group active) group))
11925                         gnus-active-hashtb))
11926             (cond
11927              ((null split-name)
11928               (gnus-completing-read-with-default
11929                default prom active 'gnus-valid-move-group-p nil prefix
11930                'gnus-group-history))
11931              ((= 1 (length split-name))
11932               (gnus-completing-read-with-default
11933                (car split-name) prom active 'gnus-valid-move-group-p nil nil
11934                'gnus-group-history))
11935              (t
11936               (gnus-completing-read-with-default
11937                nil prom (mapcar 'list (nreverse split-name)) nil nil nil
11938                'gnus-group-history)))))
11939          (to-method (gnus-server-to-method (gnus-group-method to-newsgroup)))
11940          encoded)
11941     (when to-newsgroup
11942       (if (or (string= to-newsgroup "")
11943               (string= to-newsgroup prefix))
11944           (setq to-newsgroup default))
11945       (unless to-newsgroup
11946         (error "No group name entered"))
11947       (setq encoded (mm-encode-coding-string
11948                      to-newsgroup
11949                      (gnus-group-name-charset to-method to-newsgroup)))
11950       (or (gnus-active encoded)
11951           (gnus-activate-group encoded nil nil to-method)
11952           (if (gnus-y-or-n-p (format "No such group: %s.  Create it? "
11953                                      to-newsgroup))
11954               (or (and (gnus-request-create-group encoded to-method)
11955                        (gnus-activate-group encoded nil nil to-method)
11956                        (gnus-subscribe-group encoded))
11957                   (error "Couldn't create group %s" to-newsgroup)))
11958           (error "No such group: %s" to-newsgroup))
11959       encoded)))
11960
11961 (defvar gnus-summary-save-parts-counter)
11962 (declare-function mm-uu-dissect "mm-uu" (&optional noheader mime-type))
11963
11964 (defun gnus-summary-save-parts (type dir n &optional reverse)
11965   "Save parts matching TYPE to DIR.
11966 If REVERSE, save parts that do not match TYPE."
11967   (interactive
11968    (list (read-string "Save parts of type: "
11969                       (or (car gnus-summary-save-parts-type-history)
11970                           gnus-summary-save-parts-default-mime)
11971                       'gnus-summary-save-parts-type-history)
11972          (setq gnus-summary-save-parts-last-directory
11973                (read-file-name "Save to directory: "
11974                                gnus-summary-save-parts-last-directory
11975                                nil t))
11976          current-prefix-arg))
11977   (gnus-summary-iterate n
11978     (let ((gnus-display-mime-function nil)
11979           gnus-article-prepare-hook
11980           gnus-article-decode-hook
11981           gnus-display-mime-function
11982           gnus-break-pages
11983           (gnus-inhibit-treatment t))
11984       (gnus-summary-select-article))
11985     (with-current-buffer gnus-article-buffer
11986       (let ((handles (or gnus-article-mime-handles
11987                          (mm-dissect-buffer nil gnus-article-loose-mime)
11988                          (and gnus-article-emulate-mime
11989                               (mm-uu-dissect))))
11990             (gnus-summary-save-parts-counter 1))
11991         (when handles
11992           (gnus-summary-save-parts-1 type dir handles reverse)
11993           (unless gnus-article-mime-handles ;; Don't destroy this case.
11994             (mm-destroy-parts handles)))))))
11995
11996 (defun gnus-summary-save-parts-1 (type dir handle reverse)
11997   (if (stringp (car handle))
11998       (mapcar (lambda (h) (gnus-summary-save-parts-1 type dir h reverse))
11999               (cdr handle))
12000     (when (if reverse
12001               (not (string-match type (mm-handle-media-type handle)))
12002             (string-match type (mm-handle-media-type handle)))
12003       (let ((file (expand-file-name
12004                    (gnus-map-function
12005                     mm-file-name-rewrite-functions
12006                     (file-name-nondirectory
12007                      (or
12008                       (mail-content-type-get
12009                        (mm-handle-disposition handle) 'filename)
12010                       (mail-content-type-get
12011                        (mm-handle-type handle) 'name)
12012                       (format "%s.%d.%d" gnus-newsgroup-name
12013                               (cdr gnus-article-current)
12014                               gnus-summary-save-parts-counter))))
12015                    dir)))
12016         (incf gnus-summary-save-parts-counter)
12017         (unless (file-exists-p file)
12018           (mm-save-part-to-file handle file))))))
12019
12020 ;; Summary extract commands
12021
12022 (defun gnus-summary-insert-pseudos (pslist &optional not-view)
12023   (let ((inhibit-read-only t)
12024         (article (gnus-summary-article-number))
12025         after-article b e)
12026     (unless (gnus-summary-goto-subject article)
12027       (error "No such article: %d" article))
12028     (gnus-summary-position-point)
12029     ;; If all commands are to be bunched up on one line, we collect
12030     ;; them here.
12031     (unless gnus-view-pseudos-separately
12032       (let ((ps (setq pslist (sort pslist 'gnus-pseudos<)))
12033             files action)
12034         (while ps
12035           (setq action (cdr (assq 'action (car ps))))
12036           (setq files (list (cdr (assq 'name (car ps)))))
12037           (while (and ps (cdr ps)
12038                       (string= (or action "1")
12039                                (or (cdr (assq 'action (cadr ps))) "2")))
12040             (push (cdr (assq 'name (cadr ps))) files)
12041             (setcdr ps (cddr ps)))
12042           (when files
12043             (when (not (string-match "%s" action))
12044               (push " " files))
12045             (push " " files)
12046             (when (assq 'execute (car ps))
12047               (setcdr (assq 'execute (car ps))
12048                       (funcall (if (string-match "%s" action)
12049                                    'format 'concat)
12050                                action
12051                                (mapconcat
12052                                 (lambda (f)
12053                                   (if (equal f " ")
12054                                       f
12055                                     (shell-quote-argument f)))
12056                                 files " ")))))
12057           (setq ps (cdr ps)))))
12058     (if (and gnus-view-pseudos (not not-view))
12059         (while pslist
12060           (when (assq 'execute (car pslist))
12061             (gnus-execute-command (cdr (assq 'execute (car pslist)))
12062                                   (eq gnus-view-pseudos 'not-confirm)))
12063           (setq pslist (cdr pslist)))
12064       (save-excursion
12065         (while pslist
12066           (setq after-article (or (cdr (assq 'article (car pslist)))
12067                                   (gnus-summary-article-number)))
12068           (gnus-summary-goto-subject after-article)
12069           (forward-line 1)
12070           (setq b (point))
12071           (insert "    " (file-name-nondirectory
12072                           (cdr (assq 'name (car pslist))))
12073                   ": " (or (cdr (assq 'execute (car pslist))) "") "\n")
12074           (setq e (point))
12075           (forward-line -1)             ; back to `b'
12076           (gnus-add-text-properties
12077            b (1- e) (list 'gnus-number gnus-reffed-article-number
12078                           gnus-mouse-face-prop gnus-mouse-face))
12079           (gnus-data-enter
12080            after-article gnus-reffed-article-number
12081            gnus-unread-mark b (car pslist) 0 (- e b))
12082           (setq gnus-newsgroup-unreads
12083                 (gnus-add-to-sorted-list gnus-newsgroup-unreads
12084                                          gnus-reffed-article-number))
12085           (setq gnus-reffed-article-number (1- gnus-reffed-article-number))
12086           (setq pslist (cdr pslist)))))))
12087
12088 (defun gnus-pseudos< (p1 p2)
12089   (let ((c1 (cdr (assq 'action p1)))
12090         (c2 (cdr (assq 'action p2))))
12091     (and c1 c2 (string< c1 c2))))
12092
12093 (defun gnus-request-pseudo-article (props)
12094   (cond ((assq 'execute props)
12095          (gnus-execute-command (cdr (assq 'execute props)))))
12096   (let ((gnus-current-article (gnus-summary-article-number)))
12097     (gnus-run-hooks 'gnus-mark-article-hook)))
12098
12099 (defun gnus-execute-command (command &optional automatic)
12100   (save-excursion
12101     (gnus-article-setup-buffer)
12102     (set-buffer gnus-article-buffer)
12103     (setq buffer-read-only nil)
12104     (let ((command (if automatic command
12105                      (read-string "Command: " (cons command 0)))))
12106       (erase-buffer)
12107       (insert "$ " command "\n\n")
12108       (if gnus-view-pseudo-asynchronously
12109           (start-process "gnus-execute" (current-buffer) shell-file-name
12110                          shell-command-switch command)
12111         (call-process shell-file-name nil t nil
12112                       shell-command-switch command)))))
12113
12114 ;; Summary kill commands.
12115
12116 (defun gnus-summary-edit-global-kill (article)
12117   "Edit the \"global\" kill file."
12118   (interactive (list (gnus-summary-article-number)))
12119   (gnus-group-edit-global-kill article))
12120
12121 (defun gnus-summary-edit-local-kill ()
12122   "Edit a local kill file applied to the current newsgroup."
12123   (interactive)
12124   (setq gnus-current-headers (gnus-summary-article-header))
12125   (gnus-group-edit-local-kill
12126    (gnus-summary-article-number) gnus-newsgroup-name))
12127
12128 ;;; Header reading.
12129
12130 (defun gnus-read-header (id &optional header)
12131   "Read the headers of article ID and enter them into the Gnus system."
12132   (let ((group gnus-newsgroup-name)
12133         (gnus-override-method
12134          (or
12135           gnus-override-method
12136           (and (gnus-news-group-p gnus-newsgroup-name)
12137                (car (gnus-refer-article-methods)))))
12138         where)
12139     ;; First we check to see whether the header in question is already
12140     ;; fetched.
12141     (if (stringp id)
12142         ;; This is a Message-ID.
12143         (setq header (or header (gnus-id-to-header id)))
12144       ;; This is an article number.
12145       (setq header (or header (gnus-summary-article-header id))))
12146     (if (and header
12147              (not (gnus-summary-article-sparse-p (mail-header-number header))))
12148         ;; We have found the header.
12149         header
12150       ;; We have to really fetch the header to this article.
12151       (with-current-buffer nntp-server-buffer
12152         (when (setq where (gnus-request-head id group))
12153           (nnheader-fold-continuation-lines)
12154           (goto-char (point-max))
12155           (insert ".\n")
12156           (goto-char (point-min))
12157           (insert "211 ")
12158           (princ (cond
12159                   ((numberp id) id)
12160                   ((cdr where) (cdr where))
12161                   (header (mail-header-number header))
12162                   (t gnus-reffed-article-number))
12163                  (current-buffer))
12164           (insert " Article retrieved.\n"))
12165         (if (or (not where)
12166                 (not (setq header (car (gnus-get-newsgroup-headers nil t)))))
12167             ()                          ; Malformed head.
12168           (unless (gnus-summary-article-sparse-p (mail-header-number header))
12169             (when (and (stringp id)
12170                        (or
12171                         (not (string= (gnus-group-real-name group)
12172                                       (car where)))
12173                         (not (gnus-server-equal gnus-override-method
12174                                                 (gnus-group-method group)))))
12175               ;; If we fetched by Message-ID and the article came from
12176               ;; a different group (or server), we fudge some bogus
12177               ;; article numbers for this article.
12178               (mail-header-set-number header gnus-reffed-article-number))
12179             (with-current-buffer gnus-summary-buffer
12180               (decf gnus-reffed-article-number)
12181               (gnus-remove-header (mail-header-number header))
12182               (push header gnus-newsgroup-headers)
12183               (setq gnus-current-headers header)
12184               (push (mail-header-number header) gnus-newsgroup-limit)))
12185           header)))))
12186
12187 (defun gnus-remove-header (number)
12188   "Remove header NUMBER from `gnus-newsgroup-headers'."
12189   (if (and gnus-newsgroup-headers
12190            (= number (mail-header-number (car gnus-newsgroup-headers))))
12191       (pop gnus-newsgroup-headers)
12192     (let ((headers gnus-newsgroup-headers))
12193       (while (and (cdr headers)
12194                   (not (= number (mail-header-number (cadr headers)))))
12195         (pop headers))
12196       (when (cdr headers)
12197         (setcdr headers (cddr headers))))))
12198
12199 ;;;
12200 ;;; summary highlights
12201 ;;;
12202
12203 (defun gnus-highlight-selected-summary ()
12204   "Highlight selected article in summary buffer."
12205   ;; Added by Per Abrahamsen <amanda@iesd.auc.dk>.
12206   (when gnus-summary-selected-face
12207     (save-excursion
12208       (let* ((beg (point-at-bol))
12209              (end (point-at-eol))
12210              ;; Fix by Mike Dugan <dugan@bucrf16.bu.edu>.
12211              (from (if (get-text-property beg gnus-mouse-face-prop)
12212                        beg
12213                      (or (next-single-property-change
12214                           beg gnus-mouse-face-prop nil end)
12215                          beg)))
12216              (to
12217               (if (= from end)
12218                   (- from 2)
12219                 (or (next-single-property-change
12220                      from gnus-mouse-face-prop nil end)
12221                     end))))
12222         ;; If no mouse-face prop on line we will have to = from = end,
12223         ;; so we highlight the entire line instead.
12224         (when (= (+ to 2) from)
12225           (setq from beg)
12226           (setq to end))
12227         (if gnus-newsgroup-selected-overlay
12228             ;; Move old overlay.
12229             (gnus-move-overlay
12230              gnus-newsgroup-selected-overlay from to (current-buffer))
12231           ;; Create new overlay.
12232           (gnus-overlay-put
12233            (setq gnus-newsgroup-selected-overlay (gnus-make-overlay from to))
12234            'face gnus-summary-selected-face))))))
12235
12236 (defvar gnus-summary-highlight-line-cached nil)
12237 (defvar gnus-summary-highlight-line-trigger nil)
12238
12239 (defun gnus-summary-highlight-line-0 ()
12240   (if (and (eq gnus-summary-highlight-line-trigger
12241                gnus-summary-highlight)
12242            gnus-summary-highlight-line-cached)
12243       gnus-summary-highlight-line-cached
12244     (setq gnus-summary-highlight-line-trigger gnus-summary-highlight
12245           gnus-summary-highlight-line-cached
12246           (let* ((cond (list 'cond))
12247                  (c cond)
12248                  (list gnus-summary-highlight))
12249             (while list
12250               (setcdr c (cons (list (caar list) (list 'quote (cdar list)))
12251                               nil))
12252               (setq c (cdr c)
12253                     list (cdr list)))
12254             (gnus-byte-compile (list 'lambda nil cond))))))
12255
12256 (defun gnus-summary-highlight-line ()
12257   "Highlight current line according to `gnus-summary-highlight'."
12258   (let* ((beg (point-at-bol))
12259          (article (or (gnus-summary-article-number) gnus-current-article))
12260          (score (or (cdr (assq article
12261                                gnus-newsgroup-scored))
12262                     gnus-summary-default-score 0))
12263          (mark (or (gnus-summary-article-mark) gnus-unread-mark))
12264          (inhibit-read-only t)
12265          (default gnus-summary-default-score)
12266          (default-high gnus-summary-default-high-score)
12267          (default-low gnus-summary-default-low-score)
12268          (uncached (and gnus-summary-use-undownloaded-faces
12269                         (memq article gnus-newsgroup-undownloaded)
12270                         (not (memq article gnus-newsgroup-cached)))))
12271     (let ((face (funcall (gnus-summary-highlight-line-0))))
12272       (unless (eq face (get-text-property beg 'face))
12273         (gnus-put-text-property-excluding-characters-with-faces
12274          beg (point-at-eol) 'face
12275          (setq face (if (boundp face) (symbol-value face) face)))
12276         (when gnus-summary-highlight-line-function
12277           (funcall gnus-summary-highlight-line-function article face))))))
12278
12279 (defun gnus-update-read-articles (group unread &optional compute)
12280   "Update the list of read articles in GROUP.
12281 UNREAD is a sorted list."
12282   (let ((active (or gnus-newsgroup-active (gnus-active group)))
12283         (info (gnus-get-info group))
12284         (prev 1)
12285         read)
12286     (if (or (not info) (not active))
12287         ;; There is no info on this group if it was, in fact,
12288         ;; killed.  Gnus stores no information on killed groups, so
12289         ;; there's nothing to be done.
12290         ;; One could store the information somewhere temporarily,
12291         ;; perhaps...  Hmmm...
12292         ()
12293       ;; Remove any negative articles numbers.
12294       (while (and unread (< (car unread) 0))
12295         (setq unread (cdr unread)))
12296       ;; Remove any expired article numbers
12297       (while (and unread (< (car unread) (car active)))
12298         (setq unread (cdr unread)))
12299       ;; Compute the ranges of read articles by looking at the list of
12300       ;; unread articles.
12301       (while unread
12302         (when (/= (car unread) prev)
12303           (push (if (= prev (1- (car unread))) prev
12304                   (cons prev (1- (car unread))))
12305                 read))
12306         (setq prev (1+ (car unread)))
12307         (setq unread (cdr unread)))
12308       (when (<= prev (cdr active))
12309         (push (cons prev (cdr active)) read))
12310       (setq read (if (> (length read) 1) (nreverse read) read))
12311       (if compute
12312           read
12313         (save-excursion
12314           (let (setmarkundo)
12315             ;; Propagate the read marks to the backend.
12316             (when (and gnus-propagate-marks
12317                        (gnus-check-backend-function 'request-set-mark group))
12318               (let ((del (gnus-remove-from-range (gnus-info-read info) read))
12319                     (add (gnus-remove-from-range read (gnus-info-read info))))
12320                 (when (or add del)
12321                   (unless (gnus-check-group group)
12322                     (error "Can't open server for %s" group))
12323                   (gnus-request-set-mark
12324                    group (delq nil (list (if add (list add 'add '(read)))
12325                                          (if del (list del 'del '(read))))))
12326                   (setq setmarkundo
12327                         `(gnus-request-set-mark
12328                           ,group
12329                           ',(delq nil (list
12330                                        (if del (list del 'add '(read)))
12331                                        (if add (list add 'del '(read))))))))))
12332             (set-buffer gnus-group-buffer)
12333             (gnus-undo-register
12334               `(progn
12335                  (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
12336                  (gnus-info-set-read ',info ',(gnus-info-read info))
12337                  (gnus-get-unread-articles-in-group ',info
12338                                                     (gnus-active ,group))
12339                  (gnus-group-update-group ,group t)
12340                  ,setmarkundo))))
12341         ;; Enter this list into the group info.
12342         (gnus-info-set-read info read)
12343         ;; Set the number of unread articles in gnus-newsrc-hashtb.
12344         (gnus-get-unread-articles-in-group info (gnus-active group))
12345         t))))
12346
12347 (defun gnus-offer-save-summaries ()
12348   "Offer to save all active summary buffers."
12349   (let (buffers)
12350     ;; Go through all buffers and find all summaries.
12351     (dolist (buffer (buffer-list))
12352       (when (and (setq buffer (buffer-name buffer))
12353                  (string-match "Summary" buffer)
12354                  (with-current-buffer buffer
12355                    ;; We check that this is, indeed, a summary buffer.
12356                    (and (eq major-mode 'gnus-summary-mode)
12357                         ;; Also make sure this isn't bogus.
12358                         gnus-newsgroup-prepared
12359                         ;; Also make sure that this isn't a
12360                         ;; dead summary buffer.
12361                         (not gnus-dead-summary-mode))))
12362         (push buffer buffers)))
12363     ;; Go through all these summary buffers and offer to save them.
12364     (when buffers
12365       (save-excursion
12366         (map-y-or-n-p
12367          "Update summary buffer %s? "
12368          (lambda (buf)
12369            (switch-to-buffer buf)
12370            (gnus-summary-exit))
12371          buffers)))))
12372
12373 (defun gnus-summary-setup-default-charset ()
12374   "Setup newsgroup default charset."
12375   (if (member gnus-newsgroup-name '("nndraft:delayed" "nndraft:drafts"))
12376       (setq gnus-newsgroup-charset nil)
12377     (let* ((ignored-charsets
12378             (or gnus-newsgroup-ephemeral-ignored-charsets
12379                 (append
12380                  (and gnus-newsgroup-name
12381                       (gnus-parameter-ignored-charsets gnus-newsgroup-name))
12382                  gnus-newsgroup-ignored-charsets))))
12383       (setq gnus-newsgroup-charset
12384             (or gnus-newsgroup-ephemeral-charset
12385                 (and gnus-newsgroup-name
12386                      (gnus-parameter-charset gnus-newsgroup-name))
12387                 gnus-default-charset))
12388       (set (make-local-variable 'gnus-newsgroup-ignored-charsets)
12389            ignored-charsets))))
12390
12391 ;;;
12392 ;;; Mime Commands
12393 ;;;
12394
12395 (defun gnus-summary-display-buttonized (&optional show-all-parts)
12396   "Display the current article buffer fully MIME-buttonized.
12397 If SHOW-ALL-PARTS (the prefix) is non-nil, all multipart/* parts are
12398 treated as multipart/mixed."
12399   (interactive "P")
12400   (require 'gnus-art)
12401   (let ((gnus-unbuttonized-mime-types nil)
12402         (gnus-mime-display-multipart-as-mixed show-all-parts))
12403     (gnus-summary-show-article)))
12404
12405 (defun gnus-summary-repair-multipart (article)
12406   "Add a Content-Type header to a multipart article without one."
12407   (interactive (list (gnus-summary-article-number)))
12408   (gnus-with-article article
12409     (message-narrow-to-head)
12410     (message-remove-header "Mime-Version")
12411     (goto-char (point-max))
12412     (insert "Mime-Version: 1.0\n")
12413     (widen)
12414     (when (search-forward "\n--" nil t)
12415       (let ((separator (buffer-substring (point) (point-at-eol))))
12416         (message-narrow-to-head)
12417         (message-remove-header "Content-Type")
12418         (goto-char (point-max))
12419         (insert (format "Content-Type: multipart/mixed; boundary=\"%s\"\n"
12420                         separator))
12421         (widen))))
12422   (let (gnus-mark-article-hook)
12423     (gnus-summary-select-article t t nil article)))
12424
12425 (defun gnus-summary-toggle-display-buttonized ()
12426   "Toggle the buttonizing of the article buffer."
12427   (interactive)
12428   (require 'gnus-art)
12429   (if (setq gnus-inhibit-mime-unbuttonizing
12430             (not gnus-inhibit-mime-unbuttonizing))
12431       (let ((gnus-unbuttonized-mime-types nil))
12432         (gnus-summary-show-article))
12433     (gnus-summary-show-article)))
12434
12435 ;;;
12436 ;;; Generic summary marking commands
12437 ;;;
12438
12439 (defvar gnus-summary-marking-alist
12440   '((read gnus-del-mark "d")
12441     (unread gnus-unread-mark "u")
12442     (ticked gnus-ticked-mark "!")
12443     (dormant gnus-dormant-mark "?")
12444     (expirable gnus-expirable-mark "e"))
12445   "An alist of names/marks/keystrokes.")
12446
12447 (defvar gnus-summary-generic-mark-map (make-sparse-keymap))
12448 (defvar gnus-summary-mark-map)
12449
12450 (defun gnus-summary-make-all-marking-commands ()
12451   (define-key gnus-summary-mark-map "M" gnus-summary-generic-mark-map)
12452   (dolist (elem gnus-summary-marking-alist)
12453     (apply 'gnus-summary-make-marking-command elem)))
12454
12455 (defun gnus-summary-make-marking-command (name mark keystroke)
12456   (let ((map (make-sparse-keymap)))
12457     (define-key gnus-summary-generic-mark-map keystroke map)
12458     (dolist (lway `((next "next" next nil "n")
12459                     (next-unread "next unread" next t "N")
12460                     (prev "previous" prev nil "p")
12461                     (prev-unread "previous unread" prev t "P")
12462                     (nomove "" nil nil ,keystroke)))
12463       (let ((func (gnus-summary-make-marking-command-1
12464                    mark (car lway) lway name)))
12465         (setq func (eval func))
12466         (define-key map (nth 4 lway) func)))))
12467
12468 (defun gnus-summary-make-marking-command-1 (mark way lway name)
12469   `(defun ,(intern
12470             (format "gnus-summary-put-mark-as-%s%s"
12471                     name (if (eq way 'nomove)
12472                              ""
12473                            (concat "-" (symbol-name way)))))
12474      (n)
12475      ,(format
12476        "Mark the current article as %s%s.
12477 If N, the prefix, then repeat N times.
12478 If N is negative, move in reverse order.
12479 The difference between N and the actual number of articles marked is
12480 returned."
12481        name (cadr lway))
12482      (interactive "p")
12483      (gnus-summary-generic-mark n ,mark ',(nth 2 lway) ,(nth 3 lway))))
12484
12485 (defun gnus-summary-generic-mark (n mark move unread)
12486   "Mark N articles with MARK."
12487   (unless (eq major-mode 'gnus-summary-mode)
12488     (error "This command can only be used in the summary buffer"))
12489   (gnus-summary-show-thread)
12490   (let ((nummove
12491          (cond
12492           ((eq move 'next) 1)
12493           ((eq move 'prev) -1)
12494           (t 0))))
12495     (if (zerop nummove)
12496         (setq n 1)
12497       (when (< n 0)
12498         (setq n (abs n)
12499               nummove (* -1 nummove))))
12500     (while (and (> n 0)
12501                 (gnus-summary-mark-article nil mark)
12502                 (zerop (gnus-summary-next-subject nummove unread t)))
12503       (setq n (1- n)))
12504     (when (/= 0 n)
12505       (gnus-message 7 "No more %sarticles" (if mark "" "unread ")))
12506     (gnus-summary-recenter)
12507     (gnus-summary-position-point)
12508     (gnus-set-mode-line 'summary)
12509     n))
12510
12511 (defun gnus-summary-insert-articles (articles)
12512   (when (setq articles
12513               (gnus-sorted-difference articles
12514                                       (mapcar (lambda (h)
12515                                                 (mail-header-number h))
12516                                               gnus-newsgroup-headers)))
12517     (setq gnus-newsgroup-headers
12518           (gnus-merge 'list
12519                       gnus-newsgroup-headers
12520                       (gnus-fetch-headers articles)
12521                       'gnus-article-sort-by-number))
12522     ;; Suppress duplicates?
12523     (when gnus-suppress-duplicates
12524       (gnus-dup-suppress-articles))
12525
12526     (if (and gnus-fetch-old-headers
12527              (eq gnus-headers-retrieved-by 'nov))
12528         ;; We might want to build some more threads first.
12529         (if (eq gnus-fetch-old-headers 'invisible)
12530             (gnus-build-all-threads)
12531           (gnus-build-old-threads))
12532       ;; Mark the inserted articles that are unread as unread.
12533       (setq gnus-newsgroup-unreads
12534             (gnus-sorted-nunion
12535              gnus-newsgroup-unreads
12536              (gnus-sorted-nintersection
12537               (gnus-list-of-unread-articles gnus-newsgroup-name)
12538               articles)))
12539       ;; Mark the inserted articles as selected so that the information
12540       ;; of the marks having been changed by a user may be updated when
12541       ;; exiting this group.  See `gnus-summary-update-info'.
12542       (dolist (art articles)
12543         (setq gnus-newsgroup-unselected (delq art gnus-newsgroup-unselected))))
12544     ;; Let the Gnus agent mark articles as read.
12545     (when gnus-agent
12546       (gnus-agent-get-undownloaded-list))
12547     ;; Remove list identifiers from subject
12548     (when gnus-list-identifiers
12549       (gnus-summary-remove-list-identifiers))
12550     ;; First and last article in this newsgroup.
12551     (when gnus-newsgroup-headers
12552       (setq gnus-newsgroup-begin
12553             (mail-header-number (car gnus-newsgroup-headers))
12554             gnus-newsgroup-end
12555             (mail-header-number
12556              (gnus-last-element gnus-newsgroup-headers))))
12557     (when gnus-use-scoring
12558       (gnus-possibly-score-headers))))
12559
12560 (defun gnus-summary-insert-old-articles (&optional all)
12561   "Insert all old articles in this group.
12562 If ALL is non-nil, already read articles become readable.
12563 If ALL is a number, fetch this number of articles."
12564   (interactive "P")
12565   (prog1
12566       (let ((old (sort (mapcar 'car gnus-newsgroup-data) '<))
12567             older len)
12568         (setq older
12569               ;; Some nntp servers lie about their active range.  When
12570               ;; this happens, the active range can be in the millions.
12571               ;; Use a compressed range to avoid creating a huge list.
12572               (gnus-range-difference (list gnus-newsgroup-active) old))
12573         (setq len (gnus-range-length older))
12574         (cond
12575          ((null older) nil)
12576          ((numberp all)
12577           (if (< all len)
12578               (let ((older-range (nreverse older)))
12579                 (setq older nil)
12580
12581                 (while (> all 0)
12582                   (let* ((r (pop older-range))
12583                          (min (if (numberp r) r (car r)))
12584                          (max (if (numberp r) r (cdr r))))
12585                     (while (and (<= min max)
12586                                 (> all 0))
12587                       (push max older)
12588                       (setq all (1- all)
12589                             max (1- max))))))
12590             (setq older (gnus-uncompress-range older))))
12591          (all
12592           (setq older (gnus-uncompress-range older)))
12593          (t
12594           (when (and (numberp gnus-large-newsgroup)
12595                    (> len gnus-large-newsgroup))
12596               (let* ((cursor-in-echo-area nil)
12597                      (initial (gnus-parameter-large-newsgroup-initial
12598                                gnus-newsgroup-name))
12599                      (input
12600                       (read-string
12601                        (format
12602                         "How many articles from %s (%s %d): "
12603                         (gnus-group-decoded-name gnus-newsgroup-name)
12604                         (if initial "max" "default")
12605                         len)
12606                        (if initial
12607                            (cons (number-to-string initial)
12608                                  0)))))
12609                 (unless (string-match "^[ \t]*$" input)
12610                   (setq all (string-to-number input))
12611                   (if (< all len)
12612                       (let ((older-range (nreverse older)))
12613                         (setq older nil)
12614
12615                         (while (> all 0)
12616                           (let* ((r (pop older-range))
12617                                  (min (if (numberp r) r (car r)))
12618                                  (max (if (numberp r) r (cdr r))))
12619                             (while (and (<= min max)
12620                                         (> all 0))
12621                               (push max older)
12622                               (setq all (1- all)
12623                                     max (1- max))))))))))
12624           (setq older (gnus-uncompress-range older))))
12625         (if (not older)
12626             (message "No old news.")
12627           (gnus-summary-insert-articles older)
12628           (gnus-summary-limit (gnus-sorted-nunion old older))))
12629     (gnus-summary-position-point)))
12630
12631 (defun gnus-summary-insert-new-articles ()
12632   "Insert all new articles in this group."
12633   (interactive)
12634   (prog1
12635       (let ((old (sort (mapcar 'car gnus-newsgroup-data) '<))
12636             (old-active gnus-newsgroup-active)
12637             (nnmail-fetched-sources (list t))
12638             i new)
12639         (setq gnus-newsgroup-active
12640               (gnus-activate-group gnus-newsgroup-name 'scan))
12641         (setq i (cdr gnus-newsgroup-active))
12642         (while (> i (cdr old-active))
12643           (push i new)
12644           (decf i))
12645         (if (not new)
12646             (message "No gnus is bad news")
12647           (gnus-summary-insert-articles new)
12648           (setq gnus-newsgroup-unreads
12649                 (gnus-sorted-nunion gnus-newsgroup-unreads new))
12650           (gnus-summary-limit (gnus-sorted-nunion old new))))
12651     (gnus-summary-position-point)))
12652
12653 (gnus-summary-make-all-marking-commands)
12654
12655 (gnus-ems-redefine)
12656
12657 (provide 'gnus-sum)
12658
12659 (run-hooks 'gnus-sum-load-hook)
12660
12661 ;; Local Variables:
12662 ;; coding: iso-8859-1
12663 ;; End:
12664
12665 ;; arch-tag: 17c6748f-6d00-4d36-bf01-835c42f31235
12666 ;;; gnus-sum.el ends here