lisp/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 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 and XEmacs.
  29 (eval-and-compile
  30   (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
  31 (eval-when-compile
  32   (require 'cl))
  33 (eval-when-compile
  34   (when (featurep 'xemacs)
  35     (require 'easy-mmode))) ; for `define-minor-mode'
  36
  37 (defvar tool-bar-mode)
  38 (defvar gnus-tmp-header)
  39
  40 (require 'gnus)
  41 (require 'gnus-group)
  42 (require 'gnus-spec)
  43 (require 'gnus-range)
  44 (require 'gnus-int)
  45 (require 'gnus-undo)
  46 (require 'gnus-util)
  47 (require 'gmm-utils)
  48 (require 'mm-decode)
  49 (require 'nnoo)
  50
  51 (autoload 'gnus-summary-limit-include-cached "gnus-cache" nil t)
  52 (autoload 'gnus-cache-write-active "gnus-cache")
  53 (autoload 'gnus-mailing-list-insinuate "gnus-ml" nil t)
  54 (autoload 'turn-on-gnus-mailing-list-mode "gnus-ml" nil t)
  55 (autoload 'gnus-pick-line-number "gnus-salt" nil t)
  56 (autoload 'mm-uu-dissect "mm-uu")
  57 (autoload 'gnus-article-outlook-deuglify-article "deuglify"
  58   "Deuglify broken Outlook (Express) articles and redisplay."
  59   t)
  60 (autoload 'gnus-article-outlook-unwrap-lines "deuglify" nil t)
  61 (autoload 'gnus-article-outlook-repair-attribution "deuglify" nil t)
  62 (autoload 'gnus-article-outlook-rearrange-citation "deuglify" nil t)
  63
  64 (defcustom gnus-kill-summary-on-exit t
  65   "*If non-nil, kill the summary buffer when you exit from it.
  66 If nil, the summary will become a \"*Dead Summary*\" buffer, and
  67 it will be killed sometime later."
  68   :group 'gnus-summary-exit
  69   :type 'boolean)
  70
  71 (defcustom gnus-summary-next-group-on-exit t
  72   "If non-nil, go to the next unread newsgroup on summary exit.
  73 See `gnus-group-goto-unread'."
  74   :link '(custom-manual "(gnus)Group Maneuvering")
  75   :group 'gnus-summary-exit
  76   :version "23.1" ;; No Gnus
  77   :type 'boolean)
  78
  79 (defcustom gnus-summary-stop-at-end-of-message nil
  80   "If non-nil, don't select the next message when using `SPC'."
  81   :link '(custom-manual "(gnus)Group Maneuvering")
  82   :group 'gnus-summary-maneuvering
  83   :version "24.1"
  84   :type 'boolean)
  85
  86 (defcustom gnus-fetch-old-headers nil
  87   "*Non-nil means that Gnus will try to build threads by grabbing old headers.
  88 If an unread article in the group refers to an older, already
  89 read (or just marked as read) article, the old article will not
  90 normally be displayed in the Summary buffer.  If this variable is
  91 t, Gnus will attempt to grab the headers to the old articles, and
  92 thereby build complete threads.  If it has the value `some', all
  93 old headers will be fetched but only enough headers to connect
  94 otherwise loose threads will be displayed.  This variable can
  95 also be a number.  In that case, no more than that number of old
  96 headers will be fetched.  If it has the value `invisible', all
  97 old headers will be fetched, but none will be displayed.
  98
  99 The server has to support NOV for any of this to work.
 100
 101 This feature can seriously impact performance it ignores all
 102 locally cached header entries.  Setting it to t for groups for a
 103 server that doesn't expire articles (such as news.gmane.org),
 104 leads to very slow summary generation."
 105   :group 'gnus-thread
 106   :type '(choice (const :tag "off" nil)
 107                  (const :tag "on" t)
 108                  (const some)
 109                  (const invisible)
 110                  number
 111                  (sexp :menu-tag "other" t)))
 112
 113 (defcustom gnus-refer-thread-limit 500
 114   "*The number of old headers to fetch when doing \\<gnus-summary-mode-map>\\[gnus-summary-refer-thread].
 115 If t, fetch all the available old headers."
 116   :group 'gnus-thread
 117   :type '(choice number
 118                  (sexp :menu-tag "other" t)))
 119
 120 (defcustom gnus-summary-make-false-root 'adopt
 121   "*nil means that Gnus won't gather loose threads.
 122 If the root of a thread has expired or been read in a previous
 123 session, the information necessary to build a complete thread has been
 124 lost.  Instead of having many small sub-threads from this original thread
 125 scattered all over the summary buffer, Gnus can gather them.
 126
 127 If non-nil, Gnus will try to gather all loose sub-threads from an
 128 original thread into one large thread.
 129
 130 If this variable is non-nil, it should be one of `none', `adopt',
 131 `dummy' or `empty'.
 132
 133 If this variable is `none', Gnus will not make a false root, but just
 134 present the sub-threads after another.
 135 If this variable is `dummy', Gnus will create a dummy root that will
 136 have all the sub-threads as children.
 137 If this variable is `adopt', Gnus will make one of the \"children\"
 138 the parent and mark all the step-children as such.
 139 If this variable is `empty', the \"children\" are printed with empty
 140 subject fields.  (Or rather, they will be printed with a string
 141 given by the `gnus-summary-same-subject' variable.)"
 142   :group 'gnus-thread
 143   :type '(choice (const :tag "off" nil)
 144                  (const none)
 145                  (const dummy)
 146                  (const adopt)
 147                  (const empty)))
 148
 149 (defcustom gnus-summary-make-false-root-always nil
 150   "Always make a false dummy root."
 151   :version "22.1"
 152   :group 'gnus-thread
 153   :type 'boolean)
 154
 155 (defcustom gnus-summary-gather-exclude-subject "^ *$\\|^(none)$"
 156   "*A regexp to match subjects to be excluded from loose thread gathering.
 157 As loose thread gathering is done on subjects only, that means that
 158 there can be many false gatherings performed.  By rooting out certain
 159 common subjects, gathering might become saner."
 160   :group 'gnus-thread
 161   :type 'regexp)
 162
 163 (defcustom gnus-summary-gather-subject-limit nil
 164   "*Maximum length of subject comparisons when gathering loose threads.
 165 Use nil to compare full subjects.  Setting this variable to a low
 166 number will help gather threads that have been corrupted by
 167 newsreaders chopping off subject lines, but it might also mean that
 168 unrelated articles that have subject that happen to begin with the
 169 same few characters will be incorrectly gathered.
 170
 171 If this variable is `fuzzy', Gnus will use a fuzzy algorithm when
 172 comparing subjects."
 173   :group 'gnus-thread
 174   :type '(choice (const :tag "off" nil)
 175                  (const fuzzy)
 176                  (sexp :menu-tag "on" t)))
 177
 178 (defcustom gnus-simplify-subject-functions nil
 179   "List of functions taking a string argument that simplify subjects.
 180 The functions are applied recursively.
 181
 182 Useful functions to put in this list include:
 183 `gnus-simplify-subject-re', `gnus-simplify-subject-fuzzy',
 184 `gnus-simplify-whitespace', and `gnus-simplify-all-whitespace'."
 185   :group 'gnus-thread
 186   :type '(repeat function))
 187
 188 (defcustom gnus-simplify-ignored-prefixes nil
 189   "*Remove matches for this regexp from subject lines when simplifying fuzzily."
 190   :group 'gnus-thread
 191   :type '(choice (const :tag "off" nil)
 192                  regexp))
 193
 194 (defcustom gnus-build-sparse-threads nil
 195   "*If non-nil, fill in the gaps in threads.
 196 If `some', only fill in the gaps that are needed to tie loose threads
 197 together.  If `more', fill in all leaf nodes that Gnus can find.  If
 198 non-nil and non-`some', fill in all gaps that Gnus manages to guess."
 199   :group 'gnus-thread
 200   :type '(choice (const :tag "off" nil)
 201                  (const some)
 202                  (const more)
 203                  (sexp :menu-tag "all" t)))
 204
 205 (defcustom gnus-summary-thread-gathering-function
 206   'gnus-gather-threads-by-subject
 207   "*Function used for gathering loose threads.
 208 There are two pre-defined functions: `gnus-gather-threads-by-subject',
 209 which only takes Subjects into consideration; and
 210 `gnus-gather-threads-by-references', which compared the References
 211 headers of the articles to find matches."
 212   :group 'gnus-thread
 213   :type '(radio (function-item gnus-gather-threads-by-subject)
 214                 (function-item gnus-gather-threads-by-references)
 215                 (function :tag "other")))
 216
 217 (defcustom gnus-summary-same-subject ""
 218   "*String indicating that the current article has the same subject as the previous.
 219 This variable will only be used if the value of
 220 `gnus-summary-make-false-root' is `empty'."
 221   :group 'gnus-summary-format
 222   :type 'string)
 223
 224 (defcustom gnus-summary-goto-unread nil
 225   "*If t, many commands will go to the next unread article.
 226 This applies to marking commands as well as other commands that
 227 \"naturally\" select the next article, like, for instance, `SPC' at
 228 the end of an article.
 229
 230 If nil, the marking commands do NOT go to the next unread article
 231 \(they go to the next article instead).  If `never', commands that
 232 usually go to the next unread article, will go to the next article,
 233 whether it is read or not."
 234   :version "24.1"
 235   :group 'gnus-summary-marks
 236   :link '(custom-manual "(gnus)Setting Marks")
 237   :type '(choice (const :tag "off" nil)
 238                  (const never)
 239                  (sexp :menu-tag "on" t)))
 240
 241 (defcustom gnus-summary-default-score 0
 242   "*Default article score level.
 243 All scores generated by the score files will be added to this score.
 244 If this variable is nil, scoring will be disabled."
 245   :group 'gnus-score-default
 246   :type '(choice (const :tag "disable")
 247                  integer))
 248
 249 (defcustom gnus-summary-default-high-score 0
 250   "*Default threshold for a high scored article.
 251 An article will be highlighted as high scored if its score is greater
 252 than this score."
 253   :version "22.1"
 254   :group 'gnus-score-default
 255   :type 'integer)
 256
 257 (defcustom gnus-summary-default-low-score 0
 258   "*Default threshold for a low scored article.
 259 An article will be highlighted as low scored if its score is smaller
 260 than this score."
 261   :version "22.1"
 262   :group 'gnus-score-default
 263   :type 'integer)
 264
 265 (defcustom gnus-summary-zcore-fuzz 0
 266   "*Fuzziness factor for the zcore in the summary buffer.
 267 Articles with scores closer than this to `gnus-summary-default-score'
 268 will not be marked."
 269   :group 'gnus-summary-format
 270   :type 'integer)
 271
 272 (defcustom gnus-simplify-subject-fuzzy-regexp nil
 273   "*Strings to be removed when doing fuzzy matches.
 274 This can either be a regular expression or list of regular expressions
 275 that will be removed from subject strings if fuzzy subject
 276 simplification is selected."
 277   :group 'gnus-thread
 278   :type '(repeat regexp))
 279
 280 (defcustom gnus-show-threads t
 281   "*If non-nil, display threads in summary mode."
 282   :group 'gnus-thread
 283   :type 'boolean)
 284
 285 (defcustom gnus-thread-hide-subtree nil
 286   "*If non-nil, hide all threads initially.
 287 This can be a predicate specifier which says which threads to hide.
 288 If threads are hidden, you have to run the command
 289 `gnus-summary-show-thread' by hand or select an article."
 290   :group 'gnus-thread
 291   :type '(radio (sexp :format "Non-nil\n"
 292                       :match (lambda (widget value)
 293                                (not (or (consp value) (functionp value))))
 294                       :value t)
 295                 (const nil)
 296                 (sexp :tag "Predicate specifier")))
 297
 298 (defcustom gnus-thread-hide-killed t
 299   "*If non-nil, hide killed threads automatically."
 300   :group 'gnus-thread
 301   :type 'boolean)
 302
 303 (defcustom gnus-thread-ignore-subject t
 304   "*If non-nil, which is the default, ignore subjects and do all threading based on the Reference header.
 305 If nil, articles that have different subjects from their parents will
 306 start separate threads."
 307   :group 'gnus-thread
 308   :type 'boolean)
 309
 310 (defcustom gnus-thread-operation-ignore-subject t
 311   "*If non-nil, subjects will be ignored when doing thread commands.
 312 This affects commands like `gnus-summary-kill-thread' and
 313 `gnus-summary-lower-thread'.
 314
 315 If this variable is nil, articles in the same thread with different
 316 subjects will not be included in the operation in question.  If this
 317 variable is `fuzzy', only articles that have subjects that are fuzzily
 318 equal will be included."
 319   :group 'gnus-thread
 320   :type '(choice (const :tag "off" nil)
 321                  (const fuzzy)
 322                  (sexp :tag "on" t)))
 323
 324 (defcustom gnus-thread-indent-level 4
 325   "*Number that says how much each sub-thread should be indented."
 326   :group 'gnus-thread
 327   :type 'integer)
 328
 329 (defcustom gnus-auto-extend-newsgroup t
 330   "*If non-nil, extend newsgroup forward and backward when requested."
 331   :group 'gnus-summary-choose
 332   :type 'boolean)
 333
 334 (defcustom gnus-auto-select-first t
 335   "If non-nil, select an article on group entry.
 336 An article is selected automatically when entering a group
 337 e.g. with \\<gnus-group-mode-map>\\[gnus-group-read-group], or via `gnus-summary-next-page' or
 338 `gnus-summary-catchup-and-goto-next-group'.
 339
 340 Which article is selected is controlled by the variable
 341 `gnus-auto-select-subject'.
 342
 343 If you want to prevent automatic selection of articles in some
 344 newsgroups, set the variable to nil in `gnus-select-group-hook'."
 345   ;; Commands include...
 346   ;; \\<gnus-group-mode-map>\\[gnus-group-read-group]
 347   ;; \\<gnus-summary-mode-map>\\[gnus-summary-next-page]
 348   ;; \\<gnus-summary-mode-map>\\[gnus-summary-catchup-and-goto-next-group]
 349   :group 'gnus-group-select
 350   :type '(choice (const :tag "none" nil)
 351                  (sexp :menu-tag "first" t)))
 352
 353 (defcustom gnus-auto-select-subject 'unseen-or-unread
 354   "*Says what subject to place under point when entering a group.
 355
 356 This variable can either be the symbols `first' (place point on the
 357 first subject), `unread' (place point on the subject line of the first
 358 unread article), `best' (place point on the subject line of the
 359 higest-scored article), `unseen' (place point on the subject line of
 360 the first unseen article), `unseen-or-unread' (place point on the subject
 361 line of the first unseen article or, if all article have been seen, on the
 362 subject line of the first unread article), or a function to be called to
 363 place point on some subject line."
 364   :version "24.1"
 365   :group 'gnus-group-select
 366   :type '(choice (const best)
 367                  (const unread)
 368                  (const first)
 369                  (const unseen)
 370                  (const unseen-or-unread)))
 371
 372 (defcustom gnus-auto-select-next t
 373   "*If non-nil, offer to go to the next group from the end of the previous.
 374 If the value is t and the next newsgroup is empty, Gnus will exit
 375 summary mode and go back to group mode.  If the value is neither nil
 376 nor t, Gnus will select the following unread newsgroup.  In
 377 particular, if the value is the symbol `quietly', the next unread
 378 newsgroup will be selected without any confirmation, and if it is
 379 `almost-quietly', the next group will be selected without any
 380 confirmation if you are located on the last article in the group.
 381 Finally, if this variable is `slightly-quietly', the `\\<gnus-summary-mode-map>\\[gnus-summary-catchup-and-goto-next-group]' command
 382 will go to the next group without confirmation."
 383   :group 'gnus-summary-maneuvering
 384   :type '(choice (const :tag "off" nil)
 385                  (const quietly)
 386                  (const almost-quietly)
 387                  (const slightly-quietly)
 388                  (sexp :menu-tag "on" t)))
 389
 390 (defcustom gnus-auto-select-same nil
 391   "*If non-nil, select the next article with the same subject.
 392 If there are no more articles with the same subject, go to
 393 the first unread article."
 394   :group 'gnus-summary-maneuvering
 395   :type 'boolean)
 396
 397 (defcustom gnus-auto-select-on-ephemeral-exit 'next-noselect
 398   "What article should be selected after exiting an ephemeral group.
 399 Valid values include:
 400
 401 `next'
 402   Select the next article.
 403 `next-unread'
 404   Select the next unread article.
 405 `next-noselect'
 406   Move the cursor to the next article.  This is the default.
 407 `next-unread-noselect'
 408   Move the cursor to the next unread article.
 409
 410 If it has any other value or there is no next (unread) article, the
 411 article selected before entering to the ephemeral group will appear."
 412   :version "23.1" ;; No Gnus
 413   :group 'gnus-summary-maneuvering
 414   :type '(choice :format "%{%t%}:\n %[Value Menu%] %v"
 415                  (const next) (const next-unread)
 416                  (const next-noselect) (const next-unread-noselect)
 417                  (sexp :tag "other" :value nil)))
 418
 419 (defcustom gnus-auto-goto-ignores 'unfetched
 420   "*Says how to handle unfetched articles when maneuvering.
 421
 422 This variable can either be the symbols nil (maneuver to any
 423 article), `undownloaded' (maneuvering while unplugged ignores articles
 424 that have not been fetched), `always-undownloaded' (maneuvering always
 425 ignores articles that have not been fetched), `unfetched' (maneuvering
 426 ignores articles whose headers have not been fetched).
 427
 428 NOTE: The list of unfetched articles will always be nil when plugged
 429 and, when unplugged, a subset of the undownloaded article list."
 430   :version "22.1"
 431   :group 'gnus-summary-maneuvering
 432   :type '(choice (const :tag "None" nil)
 433                  (const :tag "Undownloaded when unplugged" undownloaded)
 434                  (const :tag "Undownloaded" always-undownloaded)
 435                  (const :tag "Unfetched" unfetched)))
 436
 437 (defcustom gnus-summary-check-current nil
 438   "*If non-nil, consider the current article when moving.
 439 The \"unread\" movement commands will stay on the same line if the
 440 current article is unread."
 441   :group 'gnus-summary-maneuvering
 442   :type 'boolean)
 443
 444 (defcustom gnus-auto-center-summary 2
 445   "*If non-nil, always center the current summary buffer.
 446 In particular, if `vertical' do only vertical recentering.  If non-nil
 447 and non-`vertical', do both horizontal and vertical recentering."
 448   :group 'gnus-summary-maneuvering
 449   :type '(choice (const :tag "none" nil)
 450                  (const vertical)
 451                  (integer :tag "height")
 452                  (sexp :menu-tag "both" t)))
 453
 454 (defcustom gnus-auto-center-group t
 455   "If non-nil, always center the group buffer."
 456   :group 'gnus-summary-maneuvering
 457   :type 'boolean)
 458
 459 (defcustom gnus-show-all-headers nil
 460   "*If non-nil, don't hide any headers."
 461   :group 'gnus-article-hiding
 462   :group 'gnus-article-headers
 463   :type 'boolean)
 464
 465 (defcustom gnus-summary-ignore-duplicates nil
 466   "*If non-nil, ignore articles with identical Message-ID headers."
 467   :group 'gnus-summary
 468   :type 'boolean)
 469
 470 (defcustom gnus-single-article-buffer nil
 471   "*If non-nil, display all articles in the same buffer.
 472 If nil, each group will get its own article buffer."
 473   :version "24.1"
 474   :group 'gnus-article-various
 475   :type 'boolean)
 476
 477 (defcustom gnus-widen-article-window nil
 478   "If non-nil, selecting the article buffer will display only the article buffer."
 479   :version "24.1"
 480   :group 'gnus-article-various
 481   :type 'boolean)
 482
 483 (defcustom gnus-break-pages t
 484   "*If non-nil, do page breaking on articles.
 485 The page delimiter is specified by the `gnus-page-delimiter'
 486 variable."
 487   :group 'gnus-article-various
 488   :type 'boolean)
 489
 490 (defcustom gnus-move-split-methods nil
 491   "*Variable used to suggest where articles are to be moved to.
 492 It uses the same syntax as the `gnus-split-methods' variable.
 493 However, whereas `gnus-split-methods' specifies file names as targets,
 494 this variable specifies group names."
 495   :group 'gnus-summary-mail
 496   :type '(repeat (choice (list :value (fun) function)
 497                          (cons :value ("" "") regexp (repeat string))
 498                          (sexp :value nil))))
 499
 500 (defcustom gnus-move-group-prefix-function 'gnus-group-real-prefix
 501   "Function used to compute default prefix for article move/copy/etc prompts.
 502 The function should take one argument, a group name, and return a
 503 string with the suggested prefix."
 504   :group 'gnus-summary-mail
 505   :type 'function)
 506
 507 ;; FIXME: Although the custom type is `character' for the following variables,
 508 ;; using multibyte characters (Latin-1, UTF-8) doesn't work.  -- rs
 509
 510 (defcustom gnus-unread-mark ?           ;Whitespace
 511   "*Mark used for unread articles."
 512   :group 'gnus-summary-marks
 513   :type 'character)
 514
 515 (defcustom gnus-ticked-mark ?!
 516   "*Mark used for ticked articles."
 517   :group 'gnus-summary-marks
 518   :type 'character)
 519
 520 (defcustom gnus-dormant-mark ??
 521   "*Mark used for dormant articles."
 522   :group 'gnus-summary-marks
 523   :type 'character)
 524
 525 (defcustom gnus-del-mark ?r
 526   "*Mark used for del'd articles."
 527   :group 'gnus-summary-marks
 528   :type 'character)
 529
 530 (defcustom gnus-read-mark ?R
 531   "*Mark used for read articles."
 532   :group 'gnus-summary-marks
 533   :type 'character)
 534
 535 (defcustom gnus-expirable-mark ?E
 536   "*Mark used for expirable articles."
 537   :group 'gnus-summary-marks
 538   :type 'character)
 539
 540 (defcustom gnus-killed-mark ?K
 541   "*Mark used for killed articles."
 542   :group 'gnus-summary-marks
 543   :type 'character)
 544
 545 (defcustom gnus-spam-mark ?$
 546   "*Mark used for spam articles."
 547   :version "22.1"
 548   :group 'gnus-summary-marks
 549   :type 'character)
 550
 551 (defcustom gnus-kill-file-mark ?X
 552   "*Mark used for articles killed by kill files."
 553   :group 'gnus-summary-marks
 554   :type 'character)
 555
 556 (defcustom gnus-low-score-mark ?Y
 557   "*Mark used for articles with a low score."
 558   :group 'gnus-summary-marks
 559   :type 'character)
 560
 561 (defcustom gnus-catchup-mark ?C
 562   "*Mark used for articles that are caught up."
 563   :group 'gnus-summary-marks
 564   :type 'character)
 565
 566 (defcustom gnus-replied-mark ?A
 567   "*Mark used for articles that have been replied to."
 568   :group 'gnus-summary-marks
 569   :type 'character)
 570
 571 (defcustom gnus-forwarded-mark ?F
 572   "*Mark used for articles that have been forwarded."
 573   :version "22.1"
 574   :group 'gnus-summary-marks
 575   :type 'character)
 576
 577 (defcustom gnus-recent-mark ?N
 578   "*Mark used for articles that are recent."
 579   :version "22.1"
 580   :group 'gnus-summary-marks
 581   :type 'character)
 582
 583 (defcustom gnus-cached-mark ?*
 584   "*Mark used for articles that are in the cache."
 585   :group 'gnus-summary-marks
 586   :type 'character)
 587
 588 (defcustom gnus-saved-mark ?S
 589   "*Mark used for articles that have been saved."
 590   :group 'gnus-summary-marks
 591   :type 'character)
 592
 593 (defcustom gnus-unseen-mark ?.
 594   "*Mark used for articles that haven't been seen."
 595   :version "22.1"
 596   :group 'gnus-summary-marks
 597   :type 'character)
 598
 599 (defcustom gnus-no-mark ?               ;Whitespace
 600   "*Mark used for articles that have no other secondary mark."
 601   :version "22.1"
 602   :group 'gnus-summary-marks
 603   :type 'character)
 604
 605 (defcustom gnus-ancient-mark ?O
 606   "*Mark used for ancient articles."
 607   :group 'gnus-summary-marks
 608   :type 'character)
 609
 610 (defcustom gnus-sparse-mark ?Q
 611   "*Mark used for sparsely reffed articles."
 612   :group 'gnus-summary-marks
 613   :type 'character)
 614
 615 (defcustom gnus-canceled-mark ?G
 616   "*Mark used for canceled articles."
 617   :group 'gnus-summary-marks
 618   :type 'character)
 619
 620 (defcustom gnus-duplicate-mark ?M
 621   "*Mark used for duplicate articles."
 622   :group 'gnus-summary-marks
 623   :type 'character)
 624
 625 (defcustom gnus-undownloaded-mark ?-
 626   "*Mark used for articles that weren't downloaded."
 627   :version "22.1"
 628   :group 'gnus-summary-marks
 629   :type 'character)
 630
 631 (defcustom gnus-downloaded-mark ?+
 632   "*Mark used for articles that were downloaded."
 633   :group 'gnus-summary-marks
 634   :type 'character)
 635
 636 (defcustom gnus-downloadable-mark ?%
 637   "*Mark used for articles that are to be downloaded."
 638   :group 'gnus-summary-marks
 639   :type 'character)
 640
 641 (defcustom gnus-unsendable-mark ?=
 642   "*Mark used for articles that won't be sent."
 643   :group 'gnus-summary-marks
 644   :type 'character)
 645
 646 (defcustom gnus-score-over-mark ?+
 647   "*Score mark used for articles with high scores."
 648   :group 'gnus-summary-marks
 649   :type 'character)
 650
 651 (defcustom gnus-score-below-mark ?-
 652   "*Score mark used for articles with low scores."
 653   :group 'gnus-summary-marks
 654   :type 'character)
 655
 656 (defcustom gnus-empty-thread-mark ?     ;Whitespace
 657   "*There is no thread under the article."
 658   :group 'gnus-summary-marks
 659   :type 'character)
 660
 661 (defcustom gnus-not-empty-thread-mark ?=
 662   "*There is a thread under the article."
 663   :group 'gnus-summary-marks
 664   :type 'character)
 665
 666 (defcustom gnus-view-pseudo-asynchronously nil
 667   "*If non-nil, Gnus will view pseudo-articles asynchronously."
 668   :group 'gnus-extract-view
 669   :type 'boolean)
 670
 671 (defcustom gnus-auto-expirable-marks
 672   (list gnus-killed-mark gnus-del-mark gnus-catchup-mark
 673         gnus-low-score-mark gnus-ancient-mark gnus-read-mark
 674         gnus-duplicate-mark)
 675   "*The list of marks converted into expiration if a group is auto-expirable."
 676   :version "24.1"
 677   :group 'gnus-summary
 678   :type '(repeat character))
 679
 680 (defcustom gnus-inhibit-user-auto-expire t
 681   "*If non-nil, user marking commands will not mark an article as expirable, even if the group has auto-expire turned on."
 682   :version "21.1"
 683   :group 'gnus-summary
 684   :type 'boolean)
 685
 686 (defcustom gnus-mark-copied-or-moved-articles-as-expirable nil
 687   "If non-nil, mark articles copied or moved to auto-expire group as expirable.
 688 If nil, the expirable marks will be unchanged except that the marks
 689 will be removed when copying or moving articles to a group that has
 690 not turned auto-expire on.  If non-nil, articles that have been read
 691 will be marked as expirable when being copied or moved to a group in
 692 which auto-expire is turned on."
 693   :version "23.2"
 694   :type 'boolean
 695   :group 'gnus-summary-marks)
 696
 697 (defcustom gnus-view-pseudos nil
 698   "*If `automatic', pseudo-articles will be viewed automatically.
 699 If `not-confirm', pseudos will be viewed automatically, and the user
 700 will not be asked to confirm the command."
 701   :group 'gnus-extract-view
 702   :type '(choice (const :tag "off" nil)
 703                  (const automatic)
 704                  (const not-confirm)))
 705
 706 (defcustom gnus-view-pseudos-separately t
 707   "*If non-nil, one pseudo-article will be created for each file to be viewed.
 708 If nil, all files that use the same viewing command will be given as a
 709 list of parameters to that command."
 710   :group 'gnus-extract-view
 711   :type 'boolean)
 712
 713 (defcustom gnus-insert-pseudo-articles t
 714   "*If non-nil, insert pseudo-articles when decoding articles."
 715   :group 'gnus-extract-view
 716   :type 'boolean)
 717
 718 (defcustom gnus-summary-dummy-line-format
 719   "   %(:                             :%) %S\n"
 720   "*The format specification for the dummy roots in the summary buffer.
 721 It works along the same lines as a normal formatting string,
 722 with some simple extensions.
 723
 724 %S  The subject
 725
 726 General format specifiers can also be used.
 727 See `(gnus)Formatting Variables'."
 728   :link '(custom-manual "(gnus)Formatting Variables")
 729   :group 'gnus-threading
 730   :type 'string)
 731
 732 (defcustom gnus-summary-mode-line-format "Gnus: %g [%A] %Z"
 733   "*The format specification for the summary mode line.
 734 It works along the same lines as a normal formatting string,
 735 with some simple extensions:
 736
 737 %G  Group name
 738 %p  Unprefixed group name
 739 %A  Current article number
 740 %z  Current article score
 741 %V  Gnus version
 742 %U  Number of unread articles in the group
 743 %e  Number of unselected articles in the group
 744 %Z  A string with unread/unselected article counts
 745 %g  Shortish group name
 746 %S  Subject of the current article
 747 %u  User-defined spec
 748 %s  Current score file name
 749 %d  Number of dormant articles
 750 %r  Number of articles that have been marked as read in this session
 751 %E  Number of articles expunged by the score files"
 752   :group 'gnus-summary-format
 753   :type 'string)
 754
 755 (defcustom gnus-list-identifiers nil
 756   "Regexp that matches list identifiers to be removed from subject.
 757 This can also be a list of regexps."
 758   :version "21.1"
 759   :group 'gnus-summary-format
 760   :group 'gnus-article-hiding
 761   :type '(choice (const :tag "none" nil)
 762                  (regexp :value ".*")
 763                  (repeat :value (".*") regexp)))
 764
 765 (defcustom gnus-summary-mark-below 0
 766   "*Mark all articles with a score below this variable as read.
 767 This variable is local to each summary buffer and usually set by the
 768 score file."
 769   :group 'gnus-score-default
 770   :type 'integer)
 771
 772 (defun gnus-widget-reversible-match (widget value)
 773   "Ignoring WIDGET, convert VALUE to internal form.
 774 VALUE should have the form `FOO' or `(not FOO)', where FOO is an symbol."
 775   ;; (debug value)
 776   (or (symbolp value)
 777       (and (listp value)
 778            (eq (length value) 2)
 779            (eq (nth 0 value) 'not)
 780            (symbolp (nth 1 value)))))
 781
 782 (defun gnus-widget-reversible-to-internal (widget value)
 783   "Ignoring WIDGET, convert VALUE to internal form.
 784 VALUE should have the form `FOO' or `(not FOO)', where FOO is an atom.
 785 FOO is converted to (FOO nil) and (not FOO) is converted to (FOO t)."
 786   ;; (debug value)
 787   (if (atom value)
 788       (list value nil)
 789     (list (nth 1 value) t)))
 790
 791 (defun gnus-widget-reversible-to-external (widget value)
 792   "Ignoring WIDGET, convert VALUE to external form.
 793 VALUE should have the form `(FOO nil)' or `(FOO t)', where FOO is an atom.
 794 \(FOO  nil) is converted to FOO and (FOO t) is converted to (not FOO)."
 795   ;; (debug value)
 796   (if (nth 1 value)
 797       (list 'not (nth 0 value))
 798     (nth 0 value)))
 799
 800 (define-widget 'gnus-widget-reversible 'group
 801   "A `group' that convert values."
 802   :match 'gnus-widget-reversible-match
 803   :value-to-internal 'gnus-widget-reversible-to-internal
 804   :value-to-external 'gnus-widget-reversible-to-external)
 805
 806 (defcustom gnus-article-sort-functions '(gnus-article-sort-by-number)
 807   "*List of functions used for sorting articles in the summary buffer.
 808
 809 Each function takes two articles and returns non-nil if the first
 810 article should be sorted before the other.  If you use more than one
 811 function, the primary sort function should be the last.  You should
 812 probably always include `gnus-article-sort-by-number' in the list of
 813 sorting functions -- preferably first.  Also note that sorting by date
 814 is often much slower than sorting by number, and the sorting order is
 815 very similar.  (Sorting by date means sorting by the time the message
 816 was sent, sorting by number means sorting by arrival time.)
 817
 818 Each item can also be a list `(not F)' where F is a function;
 819 this reverses the sort order.
 820
 821 Ready-made functions include `gnus-article-sort-by-number',
 822 `gnus-article-sort-by-author', `gnus-article-sort-by-subject',
 823 `gnus-article-sort-by-date', `gnus-article-sort-by-random'
 824 and `gnus-article-sort-by-score'.
 825
 826 When threading is turned on, the variable `gnus-thread-sort-functions'
 827 controls how articles are sorted."
 828   :group 'gnus-summary-sort
 829   :type '(repeat (gnus-widget-reversible
 830                   (choice (function-item gnus-article-sort-by-number)
 831                           (function-item gnus-article-sort-by-author)
 832                           (function-item gnus-article-sort-by-subject)
 833                           (function-item gnus-article-sort-by-date)
 834                           (function-item gnus-article-sort-by-score)
 835                           (function-item gnus-article-sort-by-random)
 836                           (function :tag "other"))
 837                   (boolean :tag "Reverse order"))))
 838
 839
 840 (defcustom gnus-thread-sort-functions '(gnus-thread-sort-by-number)
 841   "*List of functions used for sorting threads in the summary buffer.
 842 By default, threads are sorted by article number.
 843
 844 Each function takes two threads and returns non-nil if the first
 845 thread should be sorted before the other.  If you use more than one
 846 function, the primary sort function should be the last.  You should
 847 probably always include `gnus-thread-sort-by-number' in the list of
 848 sorting functions -- preferably first.  Also note that sorting by date
 849 is often much slower than sorting by number, and the sorting order is
 850 very similar.  (Sorting by date means sorting by the time the message
 851 was sent, sorting by number means sorting by arrival time.)
 852
 853 Each list item can also be a list `(not F)' where F is a
 854 function; this specifies reversed sort order.
 855
 856 Ready-made functions include `gnus-thread-sort-by-number',
 857 `gnus-thread-sort-by-author', `gnus-thread-sort-by-recipient'
 858 `gnus-thread-sort-by-subject', `gnus-thread-sort-by-date',
 859 `gnus-thread-sort-by-score', `gnus-thread-sort-by-most-recent-number',
 860 `gnus-thread-sort-by-most-recent-date', `gnus-thread-sort-by-random',
 861 and `gnus-thread-sort-by-total-score' (see
 862 `gnus-thread-score-function').
 863
 864 When threading is turned off, the variable
 865 `gnus-article-sort-functions' controls how articles are sorted."
 866   :group 'gnus-summary-sort
 867   :type '(repeat
 868           (gnus-widget-reversible
 869            (choice (function-item gnus-thread-sort-by-number)
 870                    (function-item gnus-thread-sort-by-author)
 871                    (function-item gnus-thread-sort-by-recipient)
 872                    (function-item gnus-thread-sort-by-subject)
 873                    (function-item gnus-thread-sort-by-date)
 874                    (function-item gnus-thread-sort-by-score)
 875                    (function-item gnus-thread-sort-by-most-recent-number)
 876                    (function-item gnus-thread-sort-by-most-recent-date)
 877                    (function-item gnus-thread-sort-by-random)
 878                    (function-item gnus-thread-sort-by-total-score)
 879                    (function :tag "other"))
 880            (boolean :tag "Reverse order"))))
 881
 882 (defcustom gnus-thread-score-function '+
 883   "*Function used for calculating the total score of a thread.
 884
 885 The function is called with the scores of the article and each
 886 subthread and should then return the score of the thread.
 887
 888 Some functions you can use are `+', `max', or `min'."
 889   :group 'gnus-summary-sort
 890   :type 'function)
 891
 892 (defcustom gnus-summary-expunge-below nil
 893   "All articles that have a score less than this variable will be expunged.
 894 This variable is local to the summary buffers."
 895   :group 'gnus-score-default
 896   :type '(choice (const :tag "off" nil)
 897                  integer))
 898
 899 (defcustom gnus-thread-expunge-below nil
 900   "All threads that have a total score less than this variable will be expunged.
 901 See `gnus-thread-score-function' for en explanation of what a
 902 \"thread score\" is.
 903
 904 This variable is local to the summary buffers."
 905   :group 'gnus-threading
 906   :group 'gnus-score-default
 907   :type '(choice (const :tag "off" nil)
 908                  integer))
 909
 910 (defcustom gnus-summary-mode-hook nil
 911   "*A hook for Gnus summary mode.
 912 This hook is run before any variables are set in the summary buffer."
 913   :options '(turn-on-gnus-mailing-list-mode gnus-pick-mode)
 914   :group 'gnus-summary-various
 915   :type 'hook)
 916
 917 ;; Extracted from gnus-xmas-redefine in order to preserve user settings
 918 (when (featurep 'xemacs)
 919   (add-hook 'gnus-summary-mode-hook 'gnus-xmas-summary-menu-add)
 920   (add-hook 'gnus-summary-mode-hook 'gnus-xmas-setup-summary-toolbar)
 921   (add-hook 'gnus-summary-mode-hook
 922             'gnus-xmas-switch-horizontal-scrollbar-off))
 923
 924 (defcustom gnus-summary-menu-hook nil
 925   "*Hook run after the creation of the summary mode menu."
 926   :group 'gnus-summary-visual
 927   :type 'hook)
 928
 929 (defcustom gnus-summary-exit-hook nil
 930   "*A hook called on exit from the summary buffer.
 931 It will be called with point in the group buffer."
 932   :group 'gnus-summary-exit
 933   :type 'hook)
 934
 935 (defcustom gnus-summary-prepare-hook nil
 936   "*A hook called after the summary buffer has been generated.
 937 If you want to modify the summary buffer, you can use this hook."
 938   :group 'gnus-summary-various
 939   :type 'hook)
 940
 941 (defcustom gnus-summary-prepared-hook nil
 942   "*A hook called as the last thing after the summary buffer has been generated."
 943   :group 'gnus-summary-various
 944   :type 'hook)
 945
 946 (defcustom gnus-summary-generate-hook nil
 947   "*A hook run just before generating the summary buffer.
 948 This hook is commonly used to customize threading variables and the
 949 like."
 950   :group 'gnus-summary-various
 951   :type 'hook)
 952
 953 (defcustom gnus-select-group-hook nil
 954   "*A hook called when a newsgroup is selected.
 955
 956 If you'd like to simplify subjects like the
 957 `gnus-summary-next-same-subject' command does, you can use the
 958 following hook:
 959
 960  (add-hook gnus-select-group-hook
 961            (lambda ()
 962              (mapcar (lambda (header)
 963                        (mail-header-set-subject
 964                         header
 965                         (gnus-simplify-subject
 966                          (mail-header-subject header) 're-only)))
 967                      gnus-newsgroup-headers)))"
 968   :group 'gnus-group-select
 969   :type 'hook)
 970
 971 (defcustom gnus-select-article-hook nil
 972   "*A hook called when an article is selected."
 973   :group 'gnus-summary-choose
 974   :options '(gnus-agent-fetch-selected-article)
 975   :type 'hook)
 976
 977 (defcustom gnus-visual-mark-article-hook
 978   (list 'gnus-highlight-selected-summary)
 979   "*Hook run after selecting an article in the summary buffer.
 980 It is meant to be used for highlighting the article in some way.  It
 981 is not run if `gnus-visual' is nil."
 982   :group 'gnus-summary-visual
 983   :type 'hook)
 984
 985 (defcustom gnus-parse-headers-hook nil
 986   "*A hook called before parsing the headers."
 987   :group 'gnus-various
 988   :type 'hook)
 989
 990 (defcustom gnus-exit-group-hook nil
 991   "*A hook called when exiting summary mode.
 992 This hook is not called from the non-updating exit commands like `Q'."
 993   :group 'gnus-various
 994   :type 'hook)
 995
 996 (defcustom gnus-summary-update-hook nil
 997   "*A hook called when a summary line is changed.
 998 The hook will not be called if `gnus-visual' is nil.
 999
1000 The default function `gnus-summary-highlight-line' will
1001 highlight the line according to the `gnus-summary-highlight'
1002 variable."
1003   :group 'gnus-summary-visual
1004   :type 'hook)
1005
1006 (defcustom gnus-mark-article-hook '(gnus-summary-mark-read-and-unread-as-read)
1007   "*A hook called when an article is selected for the first time.
1008 The hook is intended to mark an article as read (or unread)
1009 automatically when it is selected."
1010   :group 'gnus-summary-choose
1011   :type 'hook)
1012
1013 (defcustom gnus-group-no-more-groups-hook nil
1014   "*A hook run when returning to group mode having no more (unread) groups."
1015   :group 'gnus-group-select
1016   :type 'hook)
1017
1018 (defcustom gnus-ps-print-hook nil
1019   "*A hook run before ps-printing something from Gnus."
1020   :group 'gnus-summary
1021   :type 'hook)
1022
1023 (defcustom gnus-summary-article-move-hook nil
1024   "*A hook called after an article is moved, copied, respooled, or crossposted."
1025   :version "22.1"
1026   :group 'gnus-summary
1027   :type 'hook)
1028
1029 (defcustom gnus-summary-article-delete-hook nil
1030   "*A hook called after an article is deleted."
1031   :version "22.1"
1032   :group 'gnus-summary
1033   :type 'hook)
1034
1035 (defcustom gnus-summary-article-expire-hook nil
1036   "*A hook called after an article is expired."
1037   :version "22.1"
1038   :group 'gnus-summary
1039   :type 'hook)
1040
1041 (defcustom gnus-summary-display-arrow
1042   (and (fboundp 'display-graphic-p)
1043        (display-graphic-p))
1044   "*If non-nil, display an arrow highlighting the current article."
1045   :version "22.1"
1046   :group 'gnus-summary
1047   :type 'boolean)
1048
1049 (defcustom gnus-summary-selected-face 'gnus-summary-selected
1050   "Face used for highlighting the current article in the summary buffer."
1051   :group 'gnus-summary-visual
1052   :type 'face)
1053
1054 (defvar gnus-tmp-downloaded nil)
1055
1056 (defcustom gnus-summary-highlight
1057   '(((eq mark gnus-canceled-mark)
1058      . gnus-summary-cancelled)
1059     ((and uncached (> score default-high))
1060      . gnus-summary-high-undownloaded)
1061     ((and uncached (< score default-low))
1062      . gnus-summary-low-undownloaded)
1063     (uncached
1064      . gnus-summary-normal-undownloaded)
1065     ((and (> score default-high)
1066           (or (eq mark gnus-dormant-mark)
1067               (eq mark gnus-ticked-mark)))
1068      . gnus-summary-high-ticked)
1069     ((and (< score default-low)
1070           (or (eq mark gnus-dormant-mark)
1071               (eq mark gnus-ticked-mark)))
1072      . gnus-summary-low-ticked)
1073     ((or (eq mark gnus-dormant-mark)
1074          (eq mark gnus-ticked-mark))
1075      . gnus-summary-normal-ticked)
1076     ((and (> score default-high) (eq mark gnus-ancient-mark))
1077      . gnus-summary-high-ancient)
1078     ((and (< score default-low) (eq mark gnus-ancient-mark))
1079      . gnus-summary-low-ancient)
1080     ((eq mark gnus-ancient-mark)
1081      . gnus-summary-normal-ancient)
1082     ((and (> score default-high) (eq mark gnus-unread-mark))
1083      . gnus-summary-high-unread)
1084     ((and (< score default-low) (eq mark gnus-unread-mark))
1085      . gnus-summary-low-unread)
1086     ((eq mark gnus-unread-mark)
1087      . gnus-summary-normal-unread)
1088     ((> score default-high)
1089      . gnus-summary-high-read)
1090     ((< score default-low)
1091      . gnus-summary-low-read)
1092     (t
1093      . gnus-summary-normal-read))
1094   "*Controls the highlighting of summary buffer lines.
1095
1096 A list of (FORM . FACE) pairs.  When deciding how a particular
1097 summary line should be displayed, each form is evaluated.  The content
1098 of the face field after the first true form is used.  You can change
1099 how those summary lines are displayed, by editing the face field.
1100
1101 You can use the following variables in the FORM field.
1102
1103 score:        The article's score.
1104 default:      The default article score.
1105 default-high: The default score for high scored articles.
1106 default-low:  The default score for low scored articles.
1107 below:        The score below which articles are automatically marked as read.
1108 mark:         The article's mark.
1109 uncached:     Non-nil if the article is uncached."
1110   :group 'gnus-summary-visual
1111   :type '(repeat (cons (sexp :tag "Form" nil)
1112                        face)))
1113 (put 'gnus-summary-highlight 'risky-local-variable t)
1114
1115 (defcustom gnus-alter-header-function nil
1116   "Function called to allow alteration of article header structures.
1117 The function is called with one parameter, the article header vector,
1118 which it may alter in any way."
1119   :type '(choice (const :tag "None" nil)
1120                  function)
1121   :group 'gnus-summary)
1122
1123 (defvar gnus-decode-encoded-word-function 'mail-decode-encoded-word-string
1124   "Function used to decode a string with encoded words.")
1125
1126 (defvar gnus-decode-encoded-address-function
1127   'mail-decode-encoded-address-string
1128   "Function used to decode addresses with encoded words.")
1129
1130 (defcustom gnus-extra-headers '(To Newsgroups)
1131   "*Extra headers to parse."
1132   :version "21.1"
1133   :group 'gnus-summary
1134   :type '(repeat symbol))
1135
1136 (defcustom gnus-ignored-from-addresses
1137   (and user-mail-address
1138        (not (string= user-mail-address ""))
1139        (regexp-quote user-mail-address))
1140   "*From headers that may be suppressed in favor of To headers.
1141 This can be a regexp or a list of regexps."
1142   :version "21.1"
1143   :group 'gnus-summary
1144   :type '(choice regexp
1145                  (repeat :tag "Regexp List" regexp)))
1146
1147 (defsubst gnus-ignored-from-addresses ()
1148   (gmm-regexp-concat gnus-ignored-from-addresses))
1149
1150 (defcustom gnus-summary-to-prefix "-> "
1151   "*String prefixed to the To field in the summary line when
1152 using `gnus-ignored-from-addresses'."
1153   :version "22.1"
1154   :group 'gnus-summary
1155   :type 'string)
1156
1157 (defcustom gnus-summary-newsgroup-prefix "=> "
1158   "*String prefixed to the Newsgroup field in the summary
1159 line when using `gnus-ignored-from-addresses'."
1160   :version "22.1"
1161   :group 'gnus-summary
1162   :type 'string)
1163
1164 (defcustom gnus-newsgroup-ignored-charsets '(unknown-8bit x-unknown)
1165   "List of charsets that should be ignored.
1166 When these charsets are used in the \"charset\" parameter, the
1167 default charset will be used instead."
1168   :version "21.1"
1169   :type '(repeat symbol)
1170   :group 'gnus-charset)
1171
1172 (defcustom gnus-newsgroup-maximum-articles nil
1173   "The maximum number of articles a newsgroup.
1174 If this is a number, old articles in a newsgroup exceeding this number
1175 are silently ignored.  If it is nil, no article is ignored.  Note that
1176 setting this variable to a number might prevent you from reading very
1177 old articles."
1178   :group 'gnus-group-select
1179   :version "22.2"
1180   :type '(choice (const :tag "No limit" nil)
1181                  integer))
1182
1183 (gnus-define-group-parameter
1184  ignored-charsets
1185  :type list
1186  :function-document
1187  "Return the ignored charsets of GROUP."
1188  :variable gnus-group-ignored-charsets-alist
1189  :variable-default
1190  '(("alt\\.chinese\\.text" iso-8859-1))
1191  :variable-document
1192  "Alist of regexps (to match group names) and charsets that should be ignored.
1193 When these charsets are used in the \"charset\" parameter, the
1194 default charset will be used instead."
1195  :variable-group gnus-charset
1196  :variable-type '(repeat (cons (regexp :tag "Group")
1197                                (repeat symbol)))
1198  :parameter-type '(choice :tag "Ignored charsets"
1199                           :value nil
1200                           (repeat (symbol)))
1201  :parameter-document       "\
1202 List of charsets that should be ignored.
1203
1204 When these charsets are used in the \"charset\" parameter, the
1205 default charset will be used instead.")
1206
1207 (defcustom gnus-group-highlight-words-alist nil
1208   "Alist of group regexps and highlight regexps.
1209 This variable uses the same syntax as `gnus-emphasis-alist'."
1210   :version "21.1"
1211   :type '(repeat (cons (regexp :tag "Group")
1212                        (repeat (list (regexp :tag "Highlight regexp")
1213                                      (number :tag "Group for entire word" 0)
1214                                      (number :tag "Group for displayed part" 0)
1215                                      (symbol :tag "Face"
1216                                              gnus-emphasis-highlight-words)))))
1217   :group 'gnus-summary-visual)
1218
1219 (defcustom gnus-summary-show-article-charset-alist
1220   nil
1221   "Alist of number and charset.
1222 The article will be shown with the charset corresponding to the
1223 numbered argument.
1224 For example: ((1 . cn-gb-2312) (2 . big5))."
1225   :version "21.1"
1226   :type '(repeat (cons (number :tag "Argument" 1)
1227                        (symbol :tag "Charset")))
1228   :group 'gnus-charset)
1229
1230 (defcustom gnus-preserve-marks t
1231   "Whether marks are preserved when moving, copying and respooling messages."
1232   :version "21.1"
1233   :type 'boolean
1234   :group 'gnus-summary-marks)
1235
1236 (defcustom gnus-propagate-marks t
1237   "If non-nil, do not propagate marks to the backends."
1238   :version "23.1" ;; No Gnus
1239   :type 'boolean
1240   :group 'gnus-summary-marks)
1241
1242 (defcustom gnus-alter-articles-to-read-function nil
1243   "Function to be called to alter the list of articles to be selected."
1244   :type '(choice (const nil) function)
1245   :group 'gnus-summary)
1246
1247 (defcustom gnus-orphan-score nil
1248   "*All orphans get this score added.  Set in the score file."
1249   :group 'gnus-score-default
1250   :type '(choice (const nil)
1251                  integer))
1252
1253 (defcustom gnus-summary-save-parts-default-mime "image/.*"
1254   "*A regexp to match MIME parts when saving multiple parts of a
1255 message with `gnus-summary-save-parts' (\\<gnus-summary-mode-map>\\[gnus-summary-save-parts]).
1256 This regexp will be used by default when prompting the user for which
1257 type of files to save."
1258   :group 'gnus-summary
1259   :type 'regexp)
1260
1261 (defcustom gnus-read-all-available-headers nil
1262   "Whether Gnus should parse all headers made available to it.
1263 This is mostly relevant for slow back ends where the user may
1264 wish to widen the summary buffer to include all headers
1265 that were fetched."
1266   :version "22.1"
1267   :group 'gnus-summary
1268   :type '(choice boolean regexp))
1269
1270 (defcustom gnus-summary-pipe-output-default-command nil
1271   "Command (and optional arguments) used to pipe article to subprocess.
1272 This will be used as the default command if it is non-nil.  The value
1273 will be updated if you modify it when executing the command
1274 `gnus-summary-pipe-output' or the function `gnus-summary-save-in-pipe'."
1275   :version "23.1" ;; No Gnus
1276   :group 'gnus-summary
1277   :type '(radio (const :tag "None" nil) (string :tag "Command")))
1278
1279 (defcustom gnus-summary-muttprint-program "muttprint"
1280   "Command (and optional arguments) used to run Muttprint.
1281 The value will be updated if you modify it when executing the command
1282 `gnus-summary-muttprint'."
1283   :version "22.1"
1284   :group 'gnus-summary
1285   :type 'string)
1286
1287 (defcustom gnus-article-loose-mime t
1288   "If non-nil, don't require MIME-Version header.
1289 Some brain-damaged MUA/MTA, e.g. Lotus Domino 5.0.6 clients, does not
1290 supply the MIME-Version header or deliberately strip it from the mail.
1291 If non-nil (the default), Gnus will treat some articles as MIME
1292 even if the MIME-Version header is missing."
1293   :version "22.1"
1294   :type 'boolean
1295   :group 'gnus-article-mime)
1296
1297 (defcustom gnus-article-emulate-mime t
1298   "If non-nil, use MIME emulation for uuencode and the like.
1299 This means that Gnus will search message bodies for text that look
1300 like uuencoded bits, yEncoded bits, and so on, and present that using
1301 the normal Gnus MIME machinery."
1302   :version "22.1"
1303   :type 'boolean
1304   :group 'gnus-article-mime)
1305
1306 ;;; Internal variables
1307
1308 (defvar gnus-summary-display-cache nil)
1309 (defvar gnus-article-mime-handles nil)
1310 (defvar gnus-article-decoded-p nil)
1311 (defvar gnus-article-charset nil)
1312 (defvar gnus-article-ignored-charsets nil)
1313 (defvar gnus-scores-exclude-files nil)
1314 (defvar gnus-page-broken nil)
1315
1316 (defvar gnus-original-article nil)
1317 (defvar gnus-article-internal-prepare-hook nil)
1318 (defvar gnus-newsgroup-process-stack nil)
1319
1320 (defvar gnus-thread-indent-array nil)
1321 (defvar gnus-thread-indent-array-level gnus-thread-indent-level)
1322 (defvar gnus-sort-gathered-threads-function 'gnus-thread-sort-by-number
1323   "Function called to sort the articles within a thread after it has been gathered together.")
1324
1325 (defvar gnus-summary-save-parts-type-history nil)
1326 (defvar gnus-summary-save-parts-last-directory mm-default-directory)
1327
1328 ;; Avoid highlighting in kill files.
1329 (defvar gnus-summary-inhibit-highlight nil)
1330 (defvar gnus-newsgroup-selected-overlay nil)
1331 (defvar gnus-inhibit-limiting nil)
1332 (defvar gnus-newsgroup-adaptive-score-file nil)
1333 (defvar gnus-current-score-file nil)
1334 (defvar gnus-current-move-group nil)
1335 (defvar gnus-current-copy-group nil)
1336 (defvar gnus-current-crosspost-group nil)
1337 (defvar gnus-newsgroup-display nil)
1338
1339 (defvar gnus-newsgroup-dependencies nil)
1340 (defvar gnus-newsgroup-adaptive nil)
1341 (defvar gnus-summary-display-article-function nil)
1342 (defvar gnus-summary-highlight-line-function nil
1343   "Function called after highlighting a summary line.")
1344
1345 (defvar gnus-summary-line-format-alist
1346   `((?N ,(macroexpand '(mail-header-number gnus-tmp-header)) ?d)
1347     (?S ,(macroexpand '(mail-header-subject gnus-tmp-header)) ?s)
1348     (?s gnus-tmp-subject-or-nil ?s)
1349     (?n gnus-tmp-name ?s)
1350     (?A (car (cdr (funcall gnus-extract-address-components gnus-tmp-from)))
1351         ?s)
1352     (?a (or (car (funcall gnus-extract-address-components gnus-tmp-from))
1353             gnus-tmp-from) ?s)
1354     (?F gnus-tmp-from ?s)
1355     (?x ,(macroexpand '(mail-header-xref gnus-tmp-header)) ?s)
1356     (?D ,(macroexpand '(mail-header-date gnus-tmp-header)) ?s)
1357     (?d (gnus-dd-mmm (mail-header-date gnus-tmp-header)) ?s)
1358     (?o (gnus-date-iso8601 (mail-header-date gnus-tmp-header)) ?s)
1359     (?M ,(macroexpand '(mail-header-id gnus-tmp-header)) ?s)
1360     (?r ,(macroexpand '(mail-header-references gnus-tmp-header)) ?s)
1361     (?c (or (mail-header-chars gnus-tmp-header) 0) ?d)
1362     (?k (gnus-summary-line-message-size gnus-tmp-header) ?s)
1363     (?L gnus-tmp-lines ?s)
1364     (?O gnus-tmp-downloaded ?c)
1365     (?I gnus-tmp-indentation ?s)
1366     (?T (if (= gnus-tmp-level 0) "" (make-string (frame-width) ? )) ?s)
1367     (?R gnus-tmp-replied ?c)
1368     (?\[ gnus-tmp-opening-bracket ?c)
1369     (?\] gnus-tmp-closing-bracket ?c)
1370     (?\> (make-string gnus-tmp-level ? ) ?s)
1371     (?\< (make-string (max 0 (- 20 gnus-tmp-level)) ? ) ?s)
1372     (?i gnus-tmp-score ?d)
1373     (?z gnus-tmp-score-char ?c)
1374     (?V (gnus-thread-total-score (and (boundp 'thread) (car thread))) ?d)
1375     (?U gnus-tmp-unread ?c)
1376     (?f (gnus-summary-from-or-to-or-newsgroups gnus-tmp-header gnus-tmp-from)
1377         ?s)
1378     (?t (gnus-summary-number-of-articles-in-thread
1379          (and (boundp 'thread) (car thread)) gnus-tmp-level)
1380         ?d)
1381     (?e (gnus-summary-number-of-articles-in-thread
1382          (and (boundp 'thread) (car thread)) gnus-tmp-level t)
1383         ?c)
1384     (?u gnus-tmp-user-defined ?s)
1385     (?P (gnus-pick-line-number) ?d)
1386     (?B gnus-tmp-thread-tree-header-string ?s)
1387     (user-date (gnus-user-date
1388                 ,(macroexpand '(mail-header-date gnus-tmp-header))) ?s))
1389   "An alist of format specifications that can appear in summary lines.
1390 These are paired with what variables they correspond with, along with
1391 the type of the variable (string, integer, character, etc).")
1392
1393 (defvar gnus-summary-dummy-line-format-alist
1394   `((?S gnus-tmp-subject ?s)
1395     (?N gnus-tmp-number ?d)
1396     (?u gnus-tmp-user-defined ?s)))
1397
1398 (defvar gnus-summary-mode-line-format-alist
1399   `((?G gnus-tmp-group-name ?s)
1400     (?g (gnus-short-group-name gnus-tmp-group-name) ?s)
1401     (?p (gnus-group-real-name gnus-tmp-group-name) ?s)
1402     (?A gnus-tmp-article-number ?d)
1403     (?Z gnus-tmp-unread-and-unselected ?s)
1404     (?V gnus-version ?s)
1405     (?U gnus-tmp-unread-and-unticked ?d)
1406     (?S gnus-tmp-subject ?s)
1407     (?e gnus-tmp-unselected ?d)
1408     (?u gnus-tmp-user-defined ?s)
1409     (?d (length gnus-newsgroup-dormant) ?d)
1410     (?t (length gnus-newsgroup-marked) ?d)
1411     (?h (length gnus-newsgroup-spam-marked) ?d)
1412     (?r (length gnus-newsgroup-reads) ?d)
1413     (?z (gnus-summary-article-score gnus-tmp-article-number) ?d)
1414     (?E gnus-newsgroup-expunged-tally ?d)
1415     (?s (gnus-current-score-file-nondirectory) ?s)))
1416
1417 ;; This is here rather than in gnus-art for compilation reasons.
1418 (defvar gnus-article-mode-line-format-alist
1419   (nconc '((?w (gnus-article-wash-status) ?s)
1420            (?m (gnus-article-mime-part-status) ?s))
1421          gnus-summary-mode-line-format-alist))
1422
1423 (defvar gnus-last-search-regexp nil
1424   "Default regexp for article search command.")
1425
1426 (defvar gnus-last-shell-command nil
1427   "Default shell command on article.")
1428
1429 (defvar gnus-newsgroup-agentized nil
1430   "Locally bound in each summary buffer to indicate whether the server has been agentized.")
1431 (defvar gnus-newsgroup-begin nil)
1432 (defvar gnus-newsgroup-end nil)
1433 (defvar gnus-newsgroup-last-rmail nil)
1434 (defvar gnus-newsgroup-last-mail nil)
1435 (defvar gnus-newsgroup-last-folder nil)
1436 (defvar gnus-newsgroup-last-file nil)
1437 (defvar gnus-newsgroup-last-directory nil)
1438 (defvar gnus-newsgroup-auto-expire nil)
1439 (defvar gnus-newsgroup-active nil)
1440 (defvar gnus-newsgroup-highest nil)
1441
1442 (defvar gnus-newsgroup-data nil)
1443 (defvar gnus-newsgroup-data-reverse nil)
1444 (defvar gnus-newsgroup-limit nil)
1445 (defvar gnus-newsgroup-limits nil)
1446 (defvar gnus-summary-use-undownloaded-faces nil)
1447
1448 (defvar gnus-newsgroup-unreads nil
1449   "Sorted list of unread articles in the current newsgroup.")
1450
1451 (defvar gnus-newsgroup-unselected nil
1452   "Sorted list of unselected unread articles in the current newsgroup.")
1453
1454 (defvar gnus-newsgroup-reads nil
1455   "Alist of read articles and article marks in the current newsgroup.")
1456
1457 (defvar gnus-newsgroup-expunged-tally nil)
1458
1459 (defvar gnus-newsgroup-marked nil
1460   "Sorted list of ticked articles in the current newsgroup (a subset of unread art).")
1461
1462 (defvar gnus-newsgroup-spam-marked nil
1463   "List of ranges of articles that have been marked as spam.")
1464
1465 (defvar gnus-newsgroup-killed nil
1466   "List of ranges of articles that have been through the scoring process.")
1467
1468 (defvar gnus-newsgroup-cached nil
1469   "Sorted list of articles that come from the article cache.")
1470
1471 (defvar gnus-newsgroup-saved nil
1472   "List of articles that have been saved.")
1473
1474 (defvar gnus-newsgroup-kill-headers nil)
1475
1476 (defvar gnus-newsgroup-replied nil
1477   "List of articles that have been replied to in the current newsgroup.")
1478
1479 (defvar gnus-newsgroup-forwarded nil
1480   "List of articles that have been forwarded in the current newsgroup.")
1481
1482 (defvar gnus-newsgroup-recent nil
1483   "List of articles that have are recent in the current newsgroup.")
1484
1485 (defvar gnus-newsgroup-expirable nil
1486   "Sorted list of articles in the current newsgroup that can be expired.")
1487
1488 (defvar gnus-newsgroup-processable nil
1489   "List of articles in the current newsgroup that can be processed.")
1490
1491 (defvar gnus-newsgroup-downloadable nil
1492   "Sorted list of articles in the current newsgroup that can be processed.")
1493
1494 (defvar gnus-newsgroup-unfetched nil
1495   "Sorted list of articles in the current newsgroup whose headers have
1496 not been fetched into the agent.
1497
1498 This list will always be a subset of gnus-newsgroup-undownloaded.")
1499
1500 (defvar gnus-newsgroup-undownloaded nil
1501   "List of articles in the current newsgroup that haven't been downloaded.")
1502
1503 (defvar gnus-newsgroup-unsendable nil
1504   "List of articles in the current newsgroup that won't be sent.")
1505
1506 (defvar gnus-newsgroup-bookmarks nil
1507   "List of articles in the current newsgroup that have bookmarks.")
1508
1509 (defvar gnus-newsgroup-dormant nil
1510   "Sorted list of dormant articles in the current newsgroup.")
1511
1512 (defvar gnus-newsgroup-unseen nil
1513   "List of unseen articles in the current newsgroup.")
1514
1515 (defvar gnus-newsgroup-seen nil
1516   "Range of seen articles in the current newsgroup.")
1517
1518 (defvar gnus-newsgroup-articles nil
1519   "List of articles in the current newsgroup.")
1520
1521 (defvar gnus-newsgroup-scored nil
1522   "List of scored articles in the current newsgroup.")
1523
1524 (defvar gnus-newsgroup-headers nil
1525   "List of article headers in the current newsgroup.")
1526
1527 (defvar gnus-newsgroup-threads nil)
1528
1529 (defvar gnus-newsgroup-prepared nil
1530   "Whether the current group has been prepared properly.")
1531
1532 (defvar gnus-newsgroup-ancient nil
1533   "List of `gnus-fetch-old-headers' articles in the current newsgroup.")
1534
1535 (defvar gnus-newsgroup-sparse nil)
1536
1537 (defvar gnus-current-article nil)
1538 (defvar gnus-article-current nil)
1539 (defvar gnus-current-headers nil)
1540 (defvar gnus-have-all-headers nil)
1541 (defvar gnus-last-article nil)
1542 (defvar gnus-newsgroup-history nil)
1543 (defvar gnus-newsgroup-charset nil)
1544 (defvar gnus-newsgroup-ephemeral-charset nil)
1545 (defvar gnus-newsgroup-ephemeral-ignored-charsets nil)
1546
1547 (defvar gnus-article-before-search nil)
1548
1549 (defvar gnus-summary-local-variables
1550   '(gnus-newsgroup-name
1551
1552     ;; Marks lists
1553     gnus-newsgroup-unreads
1554     gnus-newsgroup-unselected
1555     gnus-newsgroup-marked
1556     gnus-newsgroup-spam-marked
1557     gnus-newsgroup-reads
1558     gnus-newsgroup-saved
1559     gnus-newsgroup-replied
1560     gnus-newsgroup-forwarded
1561     gnus-newsgroup-recent
1562     gnus-newsgroup-expirable
1563     gnus-newsgroup-killed
1564     gnus-newsgroup-unseen
1565     gnus-newsgroup-seen
1566     gnus-newsgroup-cached
1567     gnus-newsgroup-downloadable
1568     gnus-newsgroup-undownloaded
1569     gnus-newsgroup-unsendable
1570
1571     gnus-newsgroup-begin gnus-newsgroup-end
1572     gnus-newsgroup-last-rmail gnus-newsgroup-last-mail
1573     gnus-newsgroup-last-folder gnus-newsgroup-last-file
1574     gnus-newsgroup-last-directory
1575     gnus-newsgroup-auto-expire
1576     gnus-newsgroup-processable
1577     gnus-newsgroup-unfetched
1578     gnus-newsgroup-articles
1579     gnus-newsgroup-bookmarks gnus-newsgroup-dormant
1580     gnus-newsgroup-headers gnus-newsgroup-threads
1581     gnus-newsgroup-prepared gnus-summary-highlight-line-function
1582     gnus-current-article gnus-current-headers gnus-have-all-headers
1583     gnus-last-article gnus-article-internal-prepare-hook
1584     gnus-newsgroup-dependencies gnus-newsgroup-selected-overlay
1585     gnus-newsgroup-scored gnus-newsgroup-kill-headers
1586     gnus-thread-expunge-below
1587     gnus-score-alist gnus-current-score-file
1588     (gnus-summary-expunge-below . global)
1589     (gnus-summary-mark-below . global)
1590     (gnus-orphan-score . global)
1591     gnus-newsgroup-active gnus-scores-exclude-files
1592     gnus-newsgroup-highest
1593     gnus-newsgroup-history gnus-newsgroup-ancient
1594     gnus-newsgroup-sparse gnus-newsgroup-process-stack
1595     (gnus-newsgroup-adaptive . gnus-use-adaptive-scoring)
1596     gnus-newsgroup-adaptive-score-file (gnus-reffed-article-number . -1)
1597     (gnus-newsgroup-expunged-tally . 0)
1598     gnus-cache-removable-articles
1599     gnus-newsgroup-data gnus-newsgroup-data-reverse
1600     gnus-newsgroup-limit gnus-newsgroup-limits
1601     gnus-newsgroup-charset gnus-newsgroup-display
1602     gnus-summary-use-undownloaded-faces)
1603   "Variables that are buffer-local to the summary buffers.")
1604
1605 (defvar gnus-newsgroup-variables nil
1606   "A list of variables that have separate values in different newsgroups.
1607 A list of newsgroup (summary buffer) local variables, or cons of
1608 variables and their default expressions to be evalled (when the default
1609 values are not nil), that should be made global while the summary buffer
1610 is active.
1611
1612 Note: The default expressions will be evaluated (using function `eval')
1613 before assignment to the local variable rather than just assigned to it.
1614 If the default expression is the symbol `global', that symbol will not
1615 be evaluated but the global value of the local variable will be used
1616 instead.
1617
1618 These variables can be used to set variables in the group parameters
1619 while still allowing them to affect operations done in other buffers.
1620 For example:
1621
1622 \(setq gnus-newsgroup-variables
1623      '(message-use-followup-to
1624        (gnus-visible-headers .
1625          \"^From:\\\\|^Newsgroups:\\\\|^Subject:\\\\|^Date:\\\\|^To:\")))
1626 ")
1627
1628 (eval-when-compile
1629   ;; Bind features so that require will believe that gnus-sum has
1630   ;; already been loaded (avoids infinite recursion)
1631   (let ((features (cons 'gnus-sum features)))
1632     (require 'gnus-art)))
1633
1634 ;; MIME stuff.
1635
1636 (defvar gnus-decode-encoded-word-methods
1637   '(mail-decode-encoded-word-string)
1638   "List of methods used to decode encoded words.
1639
1640 This variable is a list of FUNCTION or (REGEXP . FUNCTION).  If item
1641 is FUNCTION, FUNCTION will be apply to all newsgroups.  If item is a
1642 \(REGEXP . FUNCTION), FUNCTION will be only apply to thes newsgroups
1643 whose names match REGEXP.
1644
1645 For example:
1646 \((\"chinese\" . gnus-decode-encoded-word-string-by-guess)
1647  mail-decode-encoded-word-string
1648  (\"chinese\" . rfc1843-decode-string))")
1649
1650 (defvar gnus-decode-encoded-word-methods-cache nil)
1651
1652 (defun gnus-multi-decode-encoded-word-string (string)
1653   "Apply the functions from `gnus-encoded-word-methods' that match."
1654   (unless (and gnus-decode-encoded-word-methods-cache
1655                (eq gnus-newsgroup-name
1656                    (car gnus-decode-encoded-word-methods-cache)))
1657     (setq gnus-decode-encoded-word-methods-cache (list gnus-newsgroup-name))
1658     (dolist (method gnus-decode-encoded-word-methods)
1659       (if (symbolp method)
1660           (nconc gnus-decode-encoded-word-methods-cache (list method))
1661         (if (and gnus-newsgroup-name
1662                  (string-match (car method) gnus-newsgroup-name))
1663             (nconc gnus-decode-encoded-word-methods-cache
1664                    (list (cdr method)))))))
1665   (dolist (method (cdr gnus-decode-encoded-word-methods-cache) string)
1666     (setq string (funcall method string))))
1667
1668 ;; Subject simplification.
1669
1670 (defun gnus-simplify-whitespace (str)
1671   "Remove excessive whitespace from STR."
1672   ;; Multiple spaces.
1673   (while (string-match "[ \t][ \t]+" str)
1674     (setq str (concat (substring str 0 (match-beginning 0))
1675                         " "
1676                         (substring str (match-end 0)))))
1677   ;; Leading spaces.
1678   (when (string-match "^[ \t]+" str)
1679     (setq str (substring str (match-end 0))))
1680   ;; Trailing spaces.
1681   (when (string-match "[ \t]+$" str)
1682     (setq str (substring str 0 (match-beginning 0))))
1683   str)
1684
1685 (defun gnus-simplify-all-whitespace (str)
1686   "Remove all whitespace from STR."
1687   (while (string-match "[ \t\n]+" str)
1688     (setq str (replace-match "" nil nil str)))
1689   str)
1690
1691 (defsubst gnus-simplify-subject-re (subject)
1692   "Remove \"Re:\" from subject lines."
1693   (if (string-match message-subject-re-regexp subject)
1694       (substring subject (match-end 0))
1695     subject))
1696
1697 (defun gnus-simplify-subject (subject &optional re-only)
1698   "Remove `Re:' and words in parentheses.
1699 If RE-ONLY is non-nil, strip leading `Re:'s only."
1700   (let ((case-fold-search t))           ;Ignore case.
1701     ;; Remove `Re:', `Re^N:', `Re(n)', and `Re[n]:'.
1702     (when (string-match "\\`\\(re\\([[(^][0-9]+[])]?\\)?:[ \t]*\\)+" subject)
1703       (setq subject (substring subject (match-end 0))))
1704     ;; Remove uninteresting prefixes.
1705     (when (and (not re-only)
1706                gnus-simplify-ignored-prefixes
1707                (string-match gnus-simplify-ignored-prefixes subject))
1708       (setq subject (substring subject (match-end 0))))
1709     ;; Remove words in parentheses from end.
1710     (unless re-only
1711       (while (string-match "[ \t\n]*([^()]*)[ \t\n]*\\'" subject)
1712         (setq subject (substring subject 0 (match-beginning 0)))))
1713     ;; Return subject string.
1714     subject))
1715
1716 ;; Remove any leading "re:"s, any trailing paren phrases, and simplify
1717 ;; all whitespace.
1718 (defsubst gnus-simplify-buffer-fuzzy-step (regexp &optional newtext)
1719   (goto-char (point-min))
1720   (while (re-search-forward regexp nil t)
1721     (replace-match (or newtext ""))))
1722
1723 (defun gnus-simplify-buffer-fuzzy ()
1724   "Simplify string in the buffer fuzzily.
1725 The string in the accessible portion of the current buffer is simplified.
1726 It is assumed to be a single-line subject.
1727 Whitespace is generally cleaned up, and miscellaneous leading/trailing
1728 matter is removed.  Additional things can be deleted by setting
1729 `gnus-simplify-subject-fuzzy-regexp'."
1730   (let ((case-fold-search t)
1731         (modified-tick))
1732     (gnus-simplify-buffer-fuzzy-step "\t" " ")
1733
1734     (while (not (eq modified-tick (buffer-modified-tick)))
1735       (setq modified-tick (buffer-modified-tick))
1736       (cond
1737        ((listp gnus-simplify-subject-fuzzy-regexp)
1738         (mapc 'gnus-simplify-buffer-fuzzy-step
1739               gnus-simplify-subject-fuzzy-regexp))
1740        (gnus-simplify-subject-fuzzy-regexp
1741         (gnus-simplify-buffer-fuzzy-step gnus-simplify-subject-fuzzy-regexp)))
1742       (gnus-simplify-buffer-fuzzy-step "^ *\\[[-+?*!][-+?*!]\\] *")
1743       (gnus-simplify-buffer-fuzzy-step
1744        "^ *\\(re\\|fw\\|fwd\\)[[{(^0-9]*[])}]?[:;] *")
1745       (gnus-simplify-buffer-fuzzy-step "^[[].*:\\( .*\\)[]]$" "\\1"))
1746
1747     (gnus-simplify-buffer-fuzzy-step " *[[{(][^()\n]*[]})] *$")
1748     (gnus-simplify-buffer-fuzzy-step "  +" " ")
1749     (gnus-simplify-buffer-fuzzy-step " $")
1750     (gnus-simplify-buffer-fuzzy-step "^ +")))
1751
1752 (defun gnus-simplify-subject-fuzzy (subject)
1753   "Simplify a subject string fuzzily.
1754 See `gnus-simplify-buffer-fuzzy' for details."
1755   (save-excursion
1756     (gnus-set-work-buffer)
1757     (let ((case-fold-search t))
1758       ;; Remove uninteresting prefixes.
1759       (when (and gnus-simplify-ignored-prefixes
1760                  (string-match gnus-simplify-ignored-prefixes subject))
1761         (setq subject (substring subject (match-end 0))))
1762       (insert subject)
1763       (inline (gnus-simplify-buffer-fuzzy))
1764       (buffer-string))))
1765
1766 (defsubst gnus-simplify-subject-fully (subject)
1767   "Simplify a subject string according to `gnus-summary-gather-subject-limit'."
1768   (cond
1769    (gnus-simplify-subject-functions
1770     (gnus-map-function gnus-simplify-subject-functions subject))
1771    ((null gnus-summary-gather-subject-limit)
1772     (gnus-simplify-subject-re subject))
1773    ((eq gnus-summary-gather-subject-limit 'fuzzy)
1774     (gnus-simplify-subject-fuzzy subject))
1775    ((numberp gnus-summary-gather-subject-limit)
1776     (truncate-string-to-width (gnus-simplify-subject-re subject)
1777                               gnus-summary-gather-subject-limit))
1778    (t
1779     subject)))
1780
1781 (defsubst gnus-subject-equal (s1 s2 &optional simple-first)
1782   "Check whether two subjects are equal.
1783 If optional argument SIMPLE-FIRST is t, first argument is already
1784 simplified."
1785   (cond
1786    ((null simple-first)
1787     (equal (gnus-simplify-subject-fully s1)
1788            (gnus-simplify-subject-fully s2)))
1789    (t
1790     (equal s1
1791            (gnus-simplify-subject-fully s2)))))
1792
1793 (defun gnus-summary-bubble-group ()
1794   "Increase the score of the current group.
1795 This is a handy function to add to `gnus-summary-exit-hook' to
1796 increase the score of each group you read."
1797   (gnus-group-add-score gnus-newsgroup-name))
1798
1799 \f
1800 ;;;
1801 ;;; Gnus summary mode
1802 ;;;
1803
1804 (put 'gnus-summary-mode 'mode-class 'special)
1805
1806 (defvar gnus-article-commands-menu)
1807
1808 ;; Non-orthogonal keys
1809
1810 (gnus-define-keys gnus-summary-mode-map
1811   " " gnus-summary-next-page
1812   "\177" gnus-summary-prev-page
1813   [delete] gnus-summary-prev-page
1814   [backspace] gnus-summary-prev-page
1815   "\r" gnus-summary-scroll-up
1816   "\M-\r" gnus-summary-scroll-down
1817   "n" gnus-summary-next-unread-article
1818   "p" gnus-summary-prev-unread-article
1819   "N" gnus-summary-next-article
1820   "P" gnus-summary-prev-article
1821   "\M-\C-n" gnus-summary-next-same-subject
1822   "\M-\C-p" gnus-summary-prev-same-subject
1823   "\M-n" gnus-summary-next-unread-subject
1824   "\M-p" gnus-summary-prev-unread-subject
1825   "." gnus-summary-first-unread-article
1826   "," gnus-summary-best-unread-article
1827   "\M-s" gnus-summary-search-article-forward
1828   "\M-r" gnus-summary-search-article-backward
1829   "\M-S" gnus-summary-repeat-search-article-forward
1830   "\M-R" gnus-summary-repeat-search-article-backward
1831   "<" gnus-summary-beginning-of-article
1832   ">" gnus-summary-end-of-article
1833   "j" gnus-summary-goto-article
1834   "^" gnus-summary-refer-parent-article
1835   "\M-^" gnus-summary-refer-article
1836   "u" gnus-summary-tick-article-forward
1837   "!" gnus-summary-tick-article-forward
1838   "U" gnus-summary-tick-article-backward
1839   "d" gnus-summary-mark-as-read-forward
1840   "D" gnus-summary-mark-as-read-backward
1841   "E" gnus-summary-mark-as-expirable
1842   "\M-u" gnus-summary-clear-mark-forward
1843   "\M-U" gnus-summary-clear-mark-backward
1844   "k" gnus-summary-kill-same-subject-and-select
1845   "\C-k" gnus-summary-kill-same-subject
1846   "\M-\C-k" gnus-summary-kill-thread
1847   "\M-\C-l" gnus-summary-lower-thread
1848   "e" gnus-summary-edit-article
1849   "#" gnus-summary-mark-as-processable
1850   "\M-#" gnus-summary-unmark-as-processable
1851   "\M-\C-t" gnus-summary-toggle-threads
1852   "\M-\C-s" gnus-summary-show-thread
1853   "\M-\C-h" gnus-summary-hide-thread
1854   "\M-\C-f" gnus-summary-next-thread
1855   "\M-\C-b" gnus-summary-prev-thread
1856   [(meta down)] gnus-summary-next-thread
1857   [(meta up)] gnus-summary-prev-thread
1858   "\M-\C-u" gnus-summary-up-thread
1859   "\M-\C-d" gnus-summary-down-thread
1860   "&" gnus-summary-execute-command
1861   "c" gnus-summary-catchup-and-exit
1862   "\C-w" gnus-summary-mark-region-as-read
1863   "\C-t" gnus-summary-toggle-truncation
1864   "?" gnus-summary-mark-as-dormant
1865   "\C-c\M-\C-s" gnus-summary-limit-include-expunged
1866   "\C-c\C-s\C-n" gnus-summary-sort-by-number
1867   "\C-c\C-s\C-m\C-n" gnus-summary-sort-by-most-recent-number
1868   "\C-c\C-s\C-l" gnus-summary-sort-by-lines
1869   "\C-c\C-s\C-c" gnus-summary-sort-by-chars
1870   "\C-c\C-s\C-a" gnus-summary-sort-by-author
1871   "\C-c\C-s\C-t" gnus-summary-sort-by-recipient
1872   "\C-c\C-s\C-s" gnus-summary-sort-by-subject
1873   "\C-c\C-s\C-d" gnus-summary-sort-by-date
1874   "\C-c\C-s\C-m\C-d" gnus-summary-sort-by-most-recent-date
1875   "\C-c\C-s\C-i" gnus-summary-sort-by-score
1876   "\C-c\C-s\C-o" gnus-summary-sort-by-original
1877   "\C-c\C-s\C-r" gnus-summary-sort-by-random
1878   "=" gnus-summary-expand-window
1879   "\C-x\C-s" gnus-summary-reselect-current-group
1880   "\M-g" gnus-summary-rescan-group
1881   "\C-c\C-r" gnus-summary-caesar-message
1882   "f" gnus-summary-followup
1883   "F" gnus-summary-followup-with-original
1884   "C" gnus-summary-cancel-article
1885   "r" gnus-summary-reply
1886   "R" gnus-summary-reply-with-original
1887   "\C-c\C-f" gnus-summary-mail-forward
1888   "o" gnus-summary-save-article
1889   "\C-o" gnus-summary-save-article-mail
1890   "|" gnus-summary-pipe-output
1891   "\M-k" gnus-summary-edit-local-kill
1892   "\M-K" gnus-summary-edit-global-kill
1893   ;; "V" gnus-version
1894   "\C-c\C-d" gnus-summary-describe-group
1895   "q" gnus-summary-exit
1896   "Q" gnus-summary-exit-no-update
1897   "\C-c\C-i" gnus-info-find-node
1898   gnus-mouse-2 gnus-mouse-pick-article
1899   [follow-link] mouse-face
1900   "m" gnus-summary-mail-other-window
1901   "a" gnus-summary-post-news
1902   "x" gnus-summary-limit-to-unread
1903   "s" gnus-summary-isearch-article
1904   "t" gnus-summary-toggle-header
1905   "g" gnus-summary-show-article
1906   "l" gnus-summary-goto-last-article
1907   "\C-c\C-v\C-v" gnus-uu-decode-uu-view
1908   "\C-d" gnus-summary-enter-digest-group
1909   "\M-\C-d" gnus-summary-read-document
1910   "\M-\C-e" gnus-summary-edit-parameters
1911   "\M-\C-a" gnus-summary-customize-parameters
1912   "\C-c\C-b" gnus-bug
1913   "*" gnus-cache-enter-article
1914   "\M-*" gnus-cache-remove-article
1915   "\M-&" gnus-summary-universal-argument
1916   "\C-l" gnus-recenter
1917   "I" gnus-summary-increase-score
1918   "L" gnus-summary-lower-score
1919   "\M-i" gnus-symbolic-argument
1920   "h" gnus-summary-select-article-buffer
1921
1922   "b" gnus-article-view-part
1923   "\M-t" gnus-summary-toggle-display-buttonized
1924
1925   "V" gnus-summary-score-map
1926   "X" gnus-uu-extract-map
1927   "S" gnus-summary-send-map)
1928
1929 ;; Sort of orthogonal keymap
1930 (gnus-define-keys (gnus-summary-mark-map "M" gnus-summary-mode-map)
1931   "t" gnus-summary-tick-article-forward
1932   "!" gnus-summary-tick-article-forward
1933   "d" gnus-summary-mark-as-read-forward
1934   "r" gnus-summary-mark-as-read-forward
1935   "c" gnus-summary-clear-mark-forward
1936   " " gnus-summary-clear-mark-forward
1937   "e" gnus-summary-mark-as-expirable
1938   "x" gnus-summary-mark-as-expirable
1939   "?" gnus-summary-mark-as-dormant
1940   "b" gnus-summary-set-bookmark
1941   "B" gnus-summary-remove-bookmark
1942   "#" gnus-summary-mark-as-processable
1943   "\M-#" gnus-summary-unmark-as-processable
1944   "S" gnus-summary-limit-include-expunged
1945   "C" gnus-summary-catchup
1946   "H" gnus-summary-catchup-to-here
1947   "h" gnus-summary-catchup-from-here
1948   "\C-c" gnus-summary-catchup-all
1949   "k" gnus-summary-kill-same-subject-and-select
1950   "K" gnus-summary-kill-same-subject
1951   "P" gnus-uu-mark-map)
1952
1953 (gnus-define-keys (gnus-summary-mscore-map "V" gnus-summary-mark-map)
1954   "c" gnus-summary-clear-above
1955   "u" gnus-summary-tick-above
1956   "m" gnus-summary-mark-above
1957   "k" gnus-summary-kill-below)
1958
1959 (gnus-define-keys (gnus-summary-limit-map "/" gnus-summary-mode-map)
1960   "/" gnus-summary-limit-to-subject
1961   "n" gnus-summary-limit-to-articles
1962   "b" gnus-summary-limit-to-bodies
1963   "h" gnus-summary-limit-to-headers
1964   "w" gnus-summary-pop-limit
1965   "s" gnus-summary-limit-to-subject
1966   "a" gnus-summary-limit-to-author
1967   "u" gnus-summary-limit-to-unread
1968   "m" gnus-summary-limit-to-marks
1969   "M" gnus-summary-limit-exclude-marks
1970   "v" gnus-summary-limit-to-score
1971   "*" gnus-summary-limit-include-cached
1972   "D" gnus-summary-limit-include-dormant
1973   "T" gnus-summary-limit-include-thread
1974   "d" gnus-summary-limit-exclude-dormant
1975   "t" gnus-summary-limit-to-age
1976   "." gnus-summary-limit-to-unseen
1977   "x" gnus-summary-limit-to-extra
1978   "p" gnus-summary-limit-to-display-predicate
1979   "E" gnus-summary-limit-include-expunged
1980   "c" gnus-summary-limit-exclude-childless-dormant
1981   "C" gnus-summary-limit-mark-excluded-as-read
1982   "o" gnus-summary-insert-old-articles
1983   "N" gnus-summary-insert-new-articles
1984   "S" gnus-summary-limit-to-singletons
1985   "r" gnus-summary-limit-to-replied
1986   "R" gnus-summary-limit-to-recipient
1987   "A" gnus-summary-limit-to-address)
1988
1989 (gnus-define-keys (gnus-summary-goto-map "G" gnus-summary-mode-map)
1990   "n" gnus-summary-next-unread-article
1991   "p" gnus-summary-prev-unread-article
1992   "N" gnus-summary-next-article
1993   "P" gnus-summary-prev-article
1994   "\C-n" gnus-summary-next-same-subject
1995   "\C-p" gnus-summary-prev-same-subject
1996   "\M-n" gnus-summary-next-unread-subject
1997   "\M-p" gnus-summary-prev-unread-subject
1998   "f" gnus-summary-first-unread-article
1999   "b" gnus-summary-best-unread-article
2000   "j" gnus-summary-goto-article
2001   "g" gnus-summary-goto-subject
2002   "l" gnus-summary-goto-last-article
2003   "o" gnus-summary-pop-article)
2004
2005 (gnus-define-keys (gnus-summary-thread-map "T" gnus-summary-mode-map)
2006   "k" gnus-summary-kill-thread
2007   "E" gnus-summary-expire-thread
2008   "l" gnus-summary-lower-thread
2009   "i" gnus-summary-raise-thread
2010   "T" gnus-summary-toggle-threads
2011   "t" gnus-summary-rethread-current
2012   "^" gnus-summary-reparent-thread
2013   "\M-^" gnus-summary-reparent-children
2014   "s" gnus-summary-show-thread
2015   "S" gnus-summary-show-all-threads
2016   "h" gnus-summary-hide-thread
2017   "H" gnus-summary-hide-all-threads
2018   "n" gnus-summary-next-thread
2019   "p" gnus-summary-prev-thread
2020   "u" gnus-summary-up-thread
2021   "o" gnus-summary-top-thread
2022   "d" gnus-summary-down-thread
2023   "#" gnus-uu-mark-thread
2024   "\M-#" gnus-uu-unmark-thread)
2025
2026 (gnus-define-keys (gnus-summary-buffer-map "Y" gnus-summary-mode-map)
2027   "g" gnus-summary-prepare
2028   "c" gnus-summary-insert-cached-articles
2029   "d" gnus-summary-insert-dormant-articles
2030   "t" gnus-summary-insert-ticked-articles)
2031
2032 (gnus-define-keys (gnus-summary-exit-map "Z" gnus-summary-mode-map)
2033   "c" gnus-summary-catchup-and-exit
2034   "C" gnus-summary-catchup-all-and-exit
2035   "E" gnus-summary-exit-no-update
2036   "Q" gnus-summary-exit
2037   "Z" gnus-summary-exit
2038   "n" gnus-summary-catchup-and-goto-next-group
2039   "p" gnus-summary-catchup-and-goto-prev-group
2040   "R" gnus-summary-reselect-current-group
2041   "G" gnus-summary-rescan-group
2042   "N" gnus-summary-next-group
2043   "s" gnus-summary-save-newsrc
2044   "P" gnus-summary-prev-group)
2045
2046 (gnus-define-keys (gnus-summary-article-map "A" gnus-summary-mode-map)
2047   " " gnus-summary-next-page
2048   "n" gnus-summary-next-page
2049   "\177" gnus-summary-prev-page
2050   [delete] gnus-summary-prev-page
2051   "p" gnus-summary-prev-page
2052   "\r" gnus-summary-scroll-up
2053   "\M-\r" gnus-summary-scroll-down
2054   "<" gnus-summary-beginning-of-article
2055   ">" gnus-summary-end-of-article
2056   "b" gnus-summary-beginning-of-article
2057   "e" gnus-summary-end-of-article
2058   "^" gnus-summary-refer-parent-article
2059   "r" gnus-summary-refer-parent-article
2060   "C" gnus-summary-show-complete-article
2061   "D" gnus-summary-enter-digest-group
2062   "R" gnus-summary-refer-references
2063   "T" gnus-summary-refer-thread
2064   "g" gnus-summary-show-article
2065   "s" gnus-summary-isearch-article
2066   "P" gnus-summary-print-article
2067   "S" gnus-sticky-article
2068   "M" gnus-mailing-list-insinuate
2069   "t" gnus-article-babel)
2070
2071 (gnus-define-keys (gnus-summary-wash-map "W" gnus-summary-mode-map)
2072   "b" gnus-article-add-buttons
2073   "B" gnus-article-add-buttons-to-head
2074   "o" gnus-article-treat-overstrike
2075   "e" gnus-article-emphasize
2076   "w" gnus-article-fill-cited-article
2077   "Q" gnus-article-fill-long-lines
2078   "L" gnus-article-toggle-truncate-lines
2079   "C" gnus-article-capitalize-sentences
2080   "c" gnus-article-remove-cr
2081   "q" gnus-article-de-quoted-unreadable
2082   "6" gnus-article-de-base64-unreadable
2083   "Z" gnus-article-decode-HZ
2084   "A" gnus-article-treat-ansi-sequences
2085   "h" gnus-article-wash-html
2086   "u" gnus-article-unsplit-urls
2087   "s" gnus-summary-force-verify-and-decrypt
2088   "f" gnus-article-display-x-face
2089   "l" gnus-summary-stop-page-breaking
2090   "r" gnus-summary-caesar-message
2091   "m" gnus-summary-morse-message
2092   "t" gnus-summary-toggle-header
2093   "g" gnus-treat-smiley
2094   "v" gnus-summary-verbose-headers
2095   "a" gnus-article-strip-headers-in-body ;; mnemonic: wash archive
2096   "p" gnus-article-verify-x-pgp-sig
2097   "d" gnus-article-treat-dumbquotes
2098   "i" gnus-summary-idna-message)
2099
2100 (gnus-define-keys (gnus-summary-wash-deuglify-map "Y" gnus-summary-wash-map)
2101   ;; mnemonic: deuglif*Y*
2102   "u" gnus-article-outlook-unwrap-lines
2103   "a" gnus-article-outlook-repair-attribution
2104   "c" gnus-article-outlook-rearrange-citation
2105   "f" gnus-article-outlook-deuglify-article) ;; mnemonic: full deuglify
2106
2107 (gnus-define-keys (gnus-summary-wash-hide-map "W" gnus-summary-wash-map)
2108   "a" gnus-article-hide
2109   "h" gnus-article-hide-headers
2110   "b" gnus-article-hide-boring-headers
2111   "s" gnus-article-hide-signature
2112   "c" gnus-article-hide-citation
2113   "C" gnus-article-hide-citation-in-followups
2114   "l" gnus-article-hide-list-identifiers
2115   "B" gnus-article-strip-banner
2116   "P" gnus-article-hide-pem
2117   "\C-c" gnus-article-hide-citation-maybe)
2118
2119 (gnus-define-keys (gnus-summary-wash-highlight-map "H" gnus-summary-wash-map)
2120   "a" gnus-article-highlight
2121   "h" gnus-article-highlight-headers
2122   "c" gnus-article-highlight-citation
2123   "s" gnus-article-highlight-signature)
2124
2125 (gnus-define-keys (gnus-summary-wash-header-map "G" gnus-summary-wash-map)
2126   "f" gnus-article-treat-fold-headers
2127   "u" gnus-article-treat-unfold-headers
2128   "n" gnus-article-treat-fold-newsgroups)
2129
2130 (gnus-define-keys (gnus-summary-wash-display-map "D" gnus-summary-wash-map)
2131   "x" gnus-article-display-x-face
2132   "d" gnus-article-display-face
2133   "s" gnus-treat-smiley
2134   "D" gnus-article-remove-images
2135   "W" gnus-html-show-images
2136   "f" gnus-treat-from-picon
2137   "m" gnus-treat-mail-picon
2138   "n" gnus-treat-newsgroups-picon
2139   "g" gnus-treat-from-gravatar
2140   "h" gnus-treat-mail-gravatar)
2141
2142 (gnus-define-keys (gnus-summary-wash-mime-map "M" gnus-summary-wash-map)
2143   "w" gnus-article-decode-mime-words
2144   "c" gnus-article-decode-charset
2145   "v" gnus-mime-view-all-parts
2146   "b" gnus-article-view-part)
2147
2148 (gnus-define-keys (gnus-summary-wash-time-map "T" gnus-summary-wash-map)
2149   "z" gnus-article-date-ut
2150   "u" gnus-article-date-ut
2151   "l" gnus-article-date-local
2152   "p" gnus-article-date-english
2153   "e" gnus-article-date-lapsed
2154   "o" gnus-article-date-original
2155   "i" gnus-article-date-iso8601
2156   "s" gnus-article-date-user)
2157
2158 (gnus-define-keys (gnus-summary-wash-empty-map "E" gnus-summary-wash-map)
2159   "t" gnus-article-remove-trailing-blank-lines
2160   "l" gnus-article-strip-leading-blank-lines
2161   "m" gnus-article-strip-multiple-blank-lines
2162   "a" gnus-article-strip-blank-lines
2163   "A" gnus-article-strip-all-blank-lines
2164   "s" gnus-article-strip-leading-space
2165   "e" gnus-article-strip-trailing-space
2166   "w" gnus-article-remove-leading-whitespace)
2167
2168 (gnus-define-keys (gnus-summary-help-map "H" gnus-summary-mode-map)
2169   "v" gnus-version
2170   "d" gnus-summary-describe-group
2171   "h" gnus-summary-describe-briefly
2172   "i" gnus-info-find-node)
2173
2174 (gnus-define-keys (gnus-summary-backend-map "B" gnus-summary-mode-map)
2175   "e" gnus-summary-expire-articles
2176   "\M-\C-e" gnus-summary-expire-articles-now
2177   "\177" gnus-summary-delete-article
2178   [delete] gnus-summary-delete-article
2179   [backspace] gnus-summary-delete-article
2180   "m" gnus-summary-move-article
2181   "r" gnus-summary-respool-article
2182   "w" gnus-summary-edit-article
2183   "c" gnus-summary-copy-article
2184   "B" gnus-summary-crosspost-article
2185   "q" gnus-summary-respool-query
2186   "t" gnus-summary-respool-trace
2187   "i" gnus-summary-import-article
2188   "I" gnus-summary-create-article
2189   "p" gnus-summary-article-posted-p)
2190
2191 (gnus-define-keys (gnus-summary-save-map "O" gnus-summary-mode-map)
2192   "o" gnus-summary-save-article
2193   "m" gnus-summary-save-article-mail
2194   "F" gnus-summary-write-article-file
2195   "r" gnus-summary-save-article-rmail
2196   "f" gnus-summary-save-article-file
2197   "b" gnus-summary-save-article-body-file
2198   "B" gnus-summary-write-article-body-file
2199   "h" gnus-summary-save-article-folder
2200   "v" gnus-summary-save-article-vm
2201   "p" gnus-summary-pipe-output
2202   "P" gnus-summary-muttprint)
2203
2204 (gnus-define-keys (gnus-summary-mime-map "K" gnus-summary-mode-map)
2205   "b" gnus-summary-display-buttonized
2206   "m" gnus-summary-repair-multipart
2207   "v" gnus-article-view-part
2208   "o" gnus-article-save-part
2209   "O" gnus-article-save-part-and-strip
2210   "r" gnus-article-replace-part
2211   "d" gnus-article-delete-part
2212   "t" gnus-article-view-part-as-type
2213   "j" gnus-article-jump-to-part
2214   "c" gnus-article-copy-part
2215   "C" gnus-article-view-part-as-charset
2216   "e" gnus-article-view-part-externally
2217   "H" gnus-article-browse-html-article
2218   "E" gnus-article-encrypt-body
2219   "i" gnus-article-inline-part
2220   "|" gnus-article-pipe-part)
2221
2222 (gnus-define-keys (gnus-uu-mark-map "P" gnus-summary-mark-map)
2223   "p" gnus-summary-mark-as-processable
2224   "u" gnus-summary-unmark-as-processable
2225   "U" gnus-summary-unmark-all-processable
2226   "v" gnus-uu-mark-over
2227   "s" gnus-uu-mark-series
2228   "r" gnus-uu-mark-region
2229   "g" gnus-uu-unmark-region
2230   "R" gnus-uu-mark-by-regexp
2231   "G" gnus-uu-unmark-by-regexp
2232   "t" gnus-uu-mark-thread
2233   "T" gnus-uu-unmark-thread
2234   "a" gnus-uu-mark-all
2235   "b" gnus-uu-mark-buffer
2236   "S" gnus-uu-mark-sparse
2237   "k" gnus-summary-kill-process-mark
2238   "y" gnus-summary-yank-process-mark
2239   "w" gnus-summary-save-process-mark
2240   "i" gnus-uu-invert-processable)
2241
2242 (gnus-define-keys (gnus-uu-extract-map "X" gnus-summary-mode-map)
2243   ;;"x" gnus-uu-extract-any
2244   "m" gnus-summary-save-parts
2245   "u" gnus-uu-decode-uu
2246   "U" gnus-uu-decode-uu-and-save
2247   "s" gnus-uu-decode-unshar
2248   "S" gnus-uu-decode-unshar-and-save
2249   "o" gnus-uu-decode-save
2250   "O" gnus-uu-decode-save
2251   "b" gnus-uu-decode-binhex
2252   "B" gnus-uu-decode-binhex
2253   "Y" gnus-uu-decode-yenc
2254   "p" gnus-uu-decode-postscript
2255   "P" gnus-uu-decode-postscript-and-save)
2256
2257 (gnus-define-keys
2258     (gnus-uu-extract-view-map "v" gnus-uu-extract-map)
2259   "u" gnus-uu-decode-uu-view
2260   "U" gnus-uu-decode-uu-and-save-view
2261   "s" gnus-uu-decode-unshar-view
2262   "S" gnus-uu-decode-unshar-and-save-view
2263   "o" gnus-uu-decode-save-view
2264   "O" gnus-uu-decode-save-view
2265   "b" gnus-uu-decode-binhex-view
2266   "B" gnus-uu-decode-binhex-view
2267   "p" gnus-uu-decode-postscript-view
2268   "P" gnus-uu-decode-postscript-and-save-view)
2269
2270 (defvar gnus-article-post-menu nil)
2271
2272 (defconst gnus-summary-menu-maxlen 20)
2273
2274 (defun gnus-summary-menu-split (menu)
2275   ;; If we have lots of elements, divide them into groups of 20
2276   ;; and make a pane (or submenu) for each one.
2277   (if (> (length menu) (/ (* gnus-summary-menu-maxlen 3) 2))
2278       (let ((menu menu) sublists next
2279             (i 1))
2280         (while menu
2281           ;; Pull off the next gnus-summary-menu-maxlen elements
2282           ;; and make them the next element of sublist.
2283           (setq next (nthcdr gnus-summary-menu-maxlen menu))
2284           (if next
2285               (setcdr (nthcdr (1- gnus-summary-menu-maxlen) menu)
2286                       nil))
2287           (setq sublists (cons (cons (format "%s ... %s" (aref (car menu) 0)
2288                                              (aref (car (last menu)) 0)) menu)
2289                                sublists))
2290           (setq i (1+ i))
2291           (setq menu next))
2292         (nreverse sublists))
2293     ;; Few elements--put them all in one pane.
2294     menu))
2295
2296 (defun gnus-summary-make-menu-bar ()
2297   (gnus-turn-off-edit-menu 'summary)
2298
2299   (unless (boundp 'gnus-summary-misc-menu)
2300
2301     (easy-menu-define
2302       gnus-summary-kill-menu gnus-summary-mode-map ""
2303       (cons
2304        "Score"
2305        (nconc
2306         (list
2307          ["Customize" gnus-score-customize t])
2308         (gnus-make-score-map 'increase)
2309         (gnus-make-score-map 'lower)
2310         '(("Mark"
2311            ["Kill below" gnus-summary-kill-below t]
2312            ["Mark above" gnus-summary-mark-above t]
2313            ["Tick above" gnus-summary-tick-above t]
2314            ["Clear above" gnus-summary-clear-above t])
2315           ["Current score" gnus-summary-current-score t]
2316           ["Set score" gnus-summary-set-score t]
2317           ["Switch current score file..." gnus-score-change-score-file t]
2318           ["Set mark below..." gnus-score-set-mark-below t]
2319           ["Set expunge below..." gnus-score-set-expunge-below t]
2320           ["Edit current score file" gnus-score-edit-current-scores t]
2321           ["Edit score file..." gnus-score-edit-file t]
2322           ["Trace score" gnus-score-find-trace t]
2323           ["Find words" gnus-score-find-favourite-words t]
2324           ["Rescore buffer" gnus-summary-rescore t]
2325           ["Increase score..." gnus-summary-increase-score t]
2326           ["Lower score..." gnus-summary-lower-score t]))))
2327
2328     ;; Define both the Article menu in the summary buffer and the
2329     ;; equivalent Commands menu in the article buffer here for
2330     ;; consistency.
2331     (let ((innards
2332            `(("Hide"
2333               ["All" gnus-article-hide t]
2334               ["Headers" gnus-article-hide-headers t]
2335               ["Signature" gnus-article-hide-signature t]
2336               ["Citation" gnus-article-hide-citation t]
2337               ["List identifiers" gnus-article-hide-list-identifiers t]
2338               ["Banner" gnus-article-strip-banner t]
2339               ["Boring headers" gnus-article-hide-boring-headers t])
2340              ("Highlight"
2341               ["All" gnus-article-highlight t]
2342               ["Headers" gnus-article-highlight-headers t]
2343               ["Signature" gnus-article-highlight-signature t]
2344               ["Citation" gnus-article-highlight-citation t])
2345              ("MIME"
2346               ["Words" gnus-article-decode-mime-words t]
2347               ["Charset" gnus-article-decode-charset t]
2348               ["QP" gnus-article-de-quoted-unreadable t]
2349               ["Base64" gnus-article-de-base64-unreadable t]
2350               ["View MIME buttons" gnus-summary-display-buttonized t]
2351               ["View all" gnus-mime-view-all-parts t]
2352               ["Verify and Decrypt" gnus-summary-force-verify-and-decrypt t]
2353               ["Encrypt body" gnus-article-encrypt-body
2354                :active (not (gnus-group-read-only-p))
2355                ,@(if (featurep 'xemacs) nil
2356                    '(:help "Encrypt the message body on disk"))]
2357               ["Extract all parts..." gnus-summary-save-parts t]
2358               ("Multipart"
2359                ["Repair multipart" gnus-summary-repair-multipart t]
2360                ["Pipe part..." gnus-article-pipe-part t]
2361                ["Inline part" gnus-article-inline-part t]
2362                ["View part as type..." gnus-article-view-part-as-type t]
2363                ["Encrypt body" gnus-article-encrypt-body
2364                 :active (not (gnus-group-read-only-p))
2365                ,@(if (featurep 'xemacs) nil
2366                    '(:help "Encrypt the message body on disk"))]
2367                ["View part externally" gnus-article-view-part-externally t]
2368                ["View HTML parts in browser" gnus-article-browse-html-article t]
2369                ["View part with charset..." gnus-article-view-part-as-charset t]
2370                ["Copy part" gnus-article-copy-part t]
2371                ["Save part..." gnus-article-save-part t]
2372                ["View part" gnus-article-view-part t]))
2373              ("Date"
2374               ["Local" gnus-article-date-local t]
2375               ["ISO8601" gnus-article-date-iso8601 t]
2376               ["UT" gnus-article-date-ut t]
2377               ["Original" gnus-article-date-original t]
2378               ["Lapsed" gnus-article-date-lapsed t]
2379               ["User-defined" gnus-article-date-user t])
2380              ("Display"
2381               ["Remove images" gnus-article-remove-images t]
2382               ["Toggle smiley" gnus-treat-smiley t]
2383               ["Show X-Face" gnus-article-display-x-face t]
2384               ["Show picons in From" gnus-treat-from-picon t]
2385               ["Show picons in mail headers" gnus-treat-mail-picon t]
2386               ["Show picons in news headers" gnus-treat-newsgroups-picon t]
2387               ["Show Gravatars in From" gnus-treat-from-gravatar t]
2388               ["Show Gravatars in mail headers" gnus-treat-mail-gravatar t]
2389               ("View as different encoding"
2390                ,@(gnus-summary-menu-split
2391                   (mapcar
2392                    (lambda (cs)
2393                      ;; Since easymenu under Emacs doesn't allow
2394                      ;; lambda forms for menu commands, we should
2395                      ;; provide intern'ed function symbols.
2396                      (let ((command (intern (format "\
2397 gnus-summary-show-article-from-menu-as-charset-%s" cs))))
2398                        (fset command
2399                              `(lambda ()
2400                                 (interactive)
2401                                 (let ((gnus-summary-show-article-charset-alist
2402                                        '((1 . ,cs))))
2403                                   (gnus-summary-show-article 1))))
2404                        `[,(symbol-name cs) ,command t]))
2405                    (sort (if (fboundp 'coding-system-list)
2406                              (coding-system-list)
2407                            (mapcar 'car mm-mime-mule-charset-alist))
2408                          'string<)))))
2409              ("Washing"
2410               ("Remove Blanks"
2411                ["Leading" gnus-article-strip-leading-blank-lines t]
2412                ["Multiple" gnus-article-strip-multiple-blank-lines t]
2413                ["Trailing" gnus-article-remove-trailing-blank-lines t]
2414                ["All of the above" gnus-article-strip-blank-lines t]
2415                ["All" gnus-article-strip-all-blank-lines t]
2416                ["Leading space" gnus-article-strip-leading-space t]
2417                ["Trailing space" gnus-article-strip-trailing-space t]
2418                ["Leading space in headers"
2419                 gnus-article-remove-leading-whitespace t])
2420               ["Overstrike" gnus-article-treat-overstrike t]
2421               ["Dumb quotes" gnus-article-treat-dumbquotes t]
2422               ["Emphasis" gnus-article-emphasize t]
2423               ["Word wrap" gnus-article-fill-cited-article t]
2424               ["Fill long lines" gnus-article-fill-long-lines t]
2425               ["Toggle truncate long lines" gnus-article-toggle-truncate-lines t]
2426               ["Capitalize sentences" gnus-article-capitalize-sentences t]
2427               ["Remove CR" gnus-article-remove-cr t]
2428               ["Quoted-Printable" gnus-article-de-quoted-unreadable t]
2429               ["Base64" gnus-article-de-base64-unreadable t]
2430               ["Rot 13" gnus-summary-caesar-message
2431                ,@(if (featurep 'xemacs) '(t)
2432                    '(:help "\"Caesar rotate\" article by 13"))]
2433               ["De-IDNA" gnus-summary-idna-message t]
2434               ["Morse decode" gnus-summary-morse-message t]
2435               ["Unix pipe..." gnus-summary-pipe-message t]
2436               ["Add buttons" gnus-article-add-buttons t]
2437               ["Add buttons to head" gnus-article-add-buttons-to-head t]
2438               ["Stop page breaking" gnus-summary-stop-page-breaking t]
2439               ["Verbose header" gnus-summary-verbose-headers t]
2440               ["Toggle header" gnus-summary-toggle-header t]
2441               ["Unfold headers" gnus-article-treat-unfold-headers t]
2442               ["Fold newsgroups" gnus-article-treat-fold-newsgroups t]
2443               ["Html" gnus-article-wash-html t]
2444               ["Unsplit URLs" gnus-article-unsplit-urls t]
2445               ["Verify X-PGP-Sig" gnus-article-verify-x-pgp-sig t]
2446               ["Decode HZ" gnus-article-decode-HZ t]
2447               ["ANSI sequences" gnus-article-treat-ansi-sequences t]
2448               ("(Outlook) Deuglify"
2449                ["Unwrap lines" gnus-article-outlook-unwrap-lines t]
2450                ["Repair attribution" gnus-article-outlook-repair-attribution t]
2451                ["Rearrange citation" gnus-article-outlook-rearrange-citation t]
2452                ["Full (Outlook) deuglify"
2453                 gnus-article-outlook-deuglify-article t])
2454               )
2455              ("Output"
2456               ["Save in default format..." gnus-summary-save-article
2457                ,@(if (featurep 'xemacs) '(t)
2458                    '(:help "Save article using default method"))]
2459               ["Save in file..." gnus-summary-save-article-file
2460                ,@(if (featurep 'xemacs) '(t)
2461                    '(:help "Save article in file"))]
2462               ["Save in Unix mail format..." gnus-summary-save-article-mail t]
2463               ["Save in MH folder..." gnus-summary-save-article-folder t]
2464               ["Save in VM folder..." gnus-summary-save-article-vm t]
2465               ["Save in RMAIL mbox..." gnus-summary-save-article-rmail t]
2466               ["Save body in file..." gnus-summary-save-article-body-file t]
2467               ["Pipe through a filter..." gnus-summary-pipe-output t]
2468               ["Print with Muttprint..." gnus-summary-muttprint t]
2469               ["Print" gnus-summary-print-article
2470                ,@(if (featurep 'xemacs) '(t)
2471                    '(:help "Generate and print a PostScript image"))])
2472              ("Copy, move,... (Backend)"
2473               ,@(if (featurep 'xemacs) nil
2474                   '(:help "Copying, moving, expiring articles..."))
2475               ["Respool article..." gnus-summary-respool-article t]
2476               ["Move article..." gnus-summary-move-article
2477                (gnus-check-backend-function
2478                 'request-move-article gnus-newsgroup-name)]
2479               ["Copy article..." gnus-summary-copy-article t]
2480               ["Crosspost article..." gnus-summary-crosspost-article
2481                (gnus-check-backend-function
2482                 'request-replace-article gnus-newsgroup-name)]
2483               ["Import file..." gnus-summary-import-article
2484                (gnus-check-backend-function
2485                 'request-accept-article gnus-newsgroup-name)]
2486               ["Create article..." gnus-summary-create-article
2487                (gnus-check-backend-function
2488                 'request-accept-article gnus-newsgroup-name)]
2489               ["Check if posted" gnus-summary-article-posted-p t]
2490               ["Edit article" gnus-summary-edit-article
2491                (not (gnus-group-read-only-p))]
2492               ["Delete article" gnus-summary-delete-article
2493                (gnus-check-backend-function
2494                 'request-expire-articles gnus-newsgroup-name)]
2495               ["Query respool" gnus-summary-respool-query t]
2496               ["Trace respool" gnus-summary-respool-trace t]
2497               ["Delete expirable articles" gnus-summary-expire-articles-now
2498                (gnus-check-backend-function
2499                 'request-expire-articles gnus-newsgroup-name)])
2500              ("Extract"
2501               ["Uudecode" gnus-uu-decode-uu
2502                ,@(if (featurep 'xemacs) '(t)
2503                    '(:help "Decode uuencoded article(s)"))]
2504               ["Uudecode and save" gnus-uu-decode-uu-and-save t]
2505               ["Unshar" gnus-uu-decode-unshar t]
2506               ["Unshar and save" gnus-uu-decode-unshar-and-save t]
2507               ["Save" gnus-uu-decode-save t]
2508               ["Binhex" gnus-uu-decode-binhex t]
2509               ["Postscript" gnus-uu-decode-postscript t]
2510               ["All MIME parts" gnus-summary-save-parts t])
2511              ("Cache"
2512               ["Enter article" gnus-cache-enter-article t]
2513               ["Remove article" gnus-cache-remove-article t])
2514              ["Translate" gnus-article-babel t]
2515              ["Select article buffer" gnus-summary-select-article-buffer t]
2516              ["Make article buffer sticky" gnus-sticky-article t]
2517              ["Enter digest buffer" gnus-summary-enter-digest-group t]
2518              ["Isearch article..." gnus-summary-isearch-article t]
2519              ["Beginning of the article" gnus-summary-beginning-of-article t]
2520              ["End of the article" gnus-summary-end-of-article t]
2521              ["Fetch parent of article" gnus-summary-refer-parent-article t]
2522              ["Fetch referenced articles" gnus-summary-refer-references t]
2523              ["Fetch current thread" gnus-summary-refer-thread t]
2524              ["Fetch article with id..." gnus-summary-refer-article t]
2525              ["Setup Mailing List Params" gnus-mailing-list-insinuate t]
2526              ["Redisplay" gnus-summary-show-article t]
2527              ["Raw article" gnus-summary-show-raw-article :keys "C-u g"])))
2528       (easy-menu-define
2529         gnus-summary-article-menu gnus-summary-mode-map ""
2530         (cons "Article" innards))
2531
2532       (if (not (keymapp gnus-summary-article-menu))
2533           (easy-menu-define
2534             gnus-article-commands-menu gnus-article-mode-map ""
2535             (cons "Commands" innards))
2536         ;; in Emacs, don't share menu.
2537         (setq gnus-article-commands-menu
2538               (copy-keymap gnus-summary-article-menu))
2539         (define-key gnus-article-mode-map [menu-bar commands]
2540           (cons "Commands" gnus-article-commands-menu))))
2541
2542     (easy-menu-define
2543       gnus-summary-thread-menu gnus-summary-mode-map ""
2544       '("Threads"
2545         ["Find all messages in thread" gnus-summary-refer-thread t]
2546         ["Toggle threading" gnus-summary-toggle-threads t]
2547         ["Hide threads" gnus-summary-hide-all-threads t]
2548         ["Show threads" gnus-summary-show-all-threads t]
2549         ["Hide thread" gnus-summary-hide-thread t]
2550         ["Show thread" gnus-summary-show-thread t]
2551         ["Go to next thread" gnus-summary-next-thread t]
2552         ["Go to previous thread" gnus-summary-prev-thread t]
2553         ["Go down thread" gnus-summary-down-thread t]
2554         ["Go up thread" gnus-summary-up-thread t]
2555         ["Top of thread" gnus-summary-top-thread t]
2556         ["Mark thread as read" gnus-summary-kill-thread t]
2557         ["Mark thread as expired" gnus-summary-expire-thread t]
2558         ["Lower thread score" gnus-summary-lower-thread t]
2559         ["Raise thread score" gnus-summary-raise-thread t]
2560         ["Rethread current" gnus-summary-rethread-current t]))
2561
2562     (easy-menu-define
2563       gnus-summary-post-menu gnus-summary-mode-map ""
2564       `("Post"
2565         ["Send a message (mail or news)" gnus-summary-post-news
2566          ,@(if (featurep 'xemacs) '(t)
2567              '(:help "Compose a new message (mail or news)"))]
2568         ["Followup" gnus-summary-followup
2569          ,@(if (featurep 'xemacs) '(t)
2570              '(:help "Post followup to this article"))]
2571         ["Followup and yank" gnus-summary-followup-with-original
2572          ,@(if (featurep 'xemacs) '(t)
2573              '(:help "Post followup to this article, quoting its contents"))]
2574         ["Supersede article" gnus-summary-supersede-article t]
2575         ["Cancel article" gnus-summary-cancel-article
2576          ,@(if (featurep 'xemacs) '(t)
2577              '(:help "Cancel an article you posted"))]
2578         ["Reply" gnus-summary-reply t]
2579         ["Reply and yank" gnus-summary-reply-with-original t]
2580         ["Wide reply" gnus-summary-wide-reply t]
2581         ["Wide reply and yank" gnus-summary-wide-reply-with-original
2582          ,@(if (featurep 'xemacs) '(t)
2583              '(:help "Mail a reply, quoting this article"))]
2584         ["Very wide reply" gnus-summary-very-wide-reply t]
2585         ["Very wide reply and yank" gnus-summary-very-wide-reply-with-original
2586          ,@(if (featurep 'xemacs) '(t)
2587              '(:help "Mail a very wide reply, quoting this article"))]
2588         ["Mail forward" gnus-summary-mail-forward t]
2589         ["Post forward" gnus-summary-post-forward t]
2590         ["Digest and mail" gnus-uu-digest-mail-forward t]
2591         ["Digest and post" gnus-uu-digest-post-forward t]
2592         ["Resend message" gnus-summary-resend-message t]
2593         ["Resend message edit" gnus-summary-resend-message-edit t]
2594         ["Send bounced mail" gnus-summary-resend-bounced-mail t]
2595         ["Send a mail" gnus-summary-mail-other-window t]
2596         ["Create a local message" gnus-summary-news-other-window t]
2597         ["Uuencode and post" gnus-uu-post-news
2598          ,@(if (featurep 'xemacs) '(t)
2599              '(:help "Post a uuencoded article"))]
2600         ["Followup via news" gnus-summary-followup-to-mail t]
2601         ["Followup via news and yank"
2602          gnus-summary-followup-to-mail-with-original t]
2603         ["Strip signature on reply"
2604          (lambda ()
2605            (interactive)
2606            (if (not (memq message-cite-function
2607                           '(message-cite-original-without-signature
2608                             message-cite-original)))
2609                ;; Stupid workaround for XEmacs not honoring :visible.
2610                (message "Can't toggle this value of `message-cite-function'")
2611              (setq message-cite-function
2612                    (if (eq message-cite-function
2613                            'message-cite-original-without-signature)
2614                        'message-cite-original
2615                      'message-cite-original-without-signature))))
2616          ;; XEmacs barfs on :visible.
2617          ,@(if (featurep 'xemacs) nil
2618              '(:visible (memq message-cite-function
2619                               '(message-cite-original-without-signature
2620                                 message-cite-original))))
2621          :style toggle
2622          :selected (eq message-cite-function
2623                        'message-cite-original-without-signature)
2624          ,@(if (featurep 'xemacs) nil
2625              '(:help "Strip signature from cited article when replying."))]
2626         ;;("Draft"
2627         ;;["Send" gnus-summary-send-draft t]
2628         ;;["Send bounced" gnus-resend-bounced-mail t])
2629         ))
2630
2631     (cond
2632      ((not (keymapp gnus-summary-post-menu))
2633       (setq gnus-article-post-menu gnus-summary-post-menu))
2634      ((not gnus-article-post-menu)
2635       ;; Don't share post menu.
2636       (setq gnus-article-post-menu
2637             (copy-keymap gnus-summary-post-menu))))
2638     (define-key gnus-article-mode-map [menu-bar post]
2639       (cons "Post" gnus-article-post-menu))
2640
2641     (easy-menu-define
2642       gnus-summary-misc-menu gnus-summary-mode-map ""
2643       `("Gnus"
2644         ("Mark Read"
2645          ["Mark as read" gnus-summary-mark-as-read-forward t]
2646          ["Mark same subject and select"
2647           gnus-summary-kill-same-subject-and-select t]
2648          ["Mark same subject" gnus-summary-kill-same-subject t]
2649          ["Catchup" gnus-summary-catchup
2650           ,@(if (featurep 'xemacs) '(t)
2651               '(:help "Mark unread articles in this group as read"))]
2652          ["Catchup all" gnus-summary-catchup-all t]
2653          ["Catchup to here" gnus-summary-catchup-to-here t]
2654          ["Catchup from here" gnus-summary-catchup-from-here t]
2655          ["Catchup region" gnus-summary-mark-region-as-read
2656           (gnus-mark-active-p)]
2657          ["Mark excluded" gnus-summary-limit-mark-excluded-as-read t])
2658         ("Mark Various"
2659          ["Tick" gnus-summary-tick-article-forward t]
2660          ["Mark as dormant" gnus-summary-mark-as-dormant t]
2661          ["Remove marks" gnus-summary-clear-mark-forward t]
2662          ["Set expirable mark" gnus-summary-mark-as-expirable t]
2663          ["Set bookmark" gnus-summary-set-bookmark t]
2664          ["Remove bookmark" gnus-summary-remove-bookmark t])
2665         ("Limit to"
2666          ["Marks..." gnus-summary-limit-to-marks t]
2667          ["Subject..." gnus-summary-limit-to-subject t]
2668          ["Author..." gnus-summary-limit-to-author t]
2669          ["Recipient..." gnus-summary-limit-to-recipient t]
2670          ["Address..." gnus-summary-limit-to-address t]
2671          ["Age..." gnus-summary-limit-to-age t]
2672          ["Extra..." gnus-summary-limit-to-extra t]
2673          ["Score..." gnus-summary-limit-to-score t]
2674          ["Display Predicate" gnus-summary-limit-to-display-predicate t]
2675          ["Unread" gnus-summary-limit-to-unread t]
2676          ["Unseen" gnus-summary-limit-to-unseen t]
2677          ["Singletons" gnus-summary-limit-to-singletons t]
2678          ["Replied" gnus-summary-limit-to-replied t]
2679          ["Non-dormant" gnus-summary-limit-exclude-dormant t]
2680          ["Next or process marked articles" gnus-summary-limit-to-articles t]
2681          ["Pop limit" gnus-summary-pop-limit t]
2682          ["Show dormant" gnus-summary-limit-include-dormant t]
2683          ["Hide childless dormant"
2684           gnus-summary-limit-exclude-childless-dormant t]
2685          ;;["Hide thread" gnus-summary-limit-exclude-thread t]
2686          ["Hide marked" gnus-summary-limit-exclude-marks t]
2687          ["Show expunged" gnus-summary-limit-include-expunged t])
2688         ("Process Mark"
2689          ["Set mark" gnus-summary-mark-as-processable t]
2690          ["Remove mark" gnus-summary-unmark-as-processable t]
2691          ["Remove all marks" gnus-summary-unmark-all-processable t]
2692          ["Invert marks" gnus-uu-invert-processable t]
2693          ["Mark above" gnus-uu-mark-over t]
2694          ["Mark series" gnus-uu-mark-series t]
2695          ["Mark region" gnus-uu-mark-region (gnus-mark-active-p)]
2696          ["Unmark region" gnus-uu-unmark-region (gnus-mark-active-p)]
2697          ["Mark by regexp..." gnus-uu-mark-by-regexp t]
2698          ["Unmark by regexp..." gnus-uu-unmark-by-regexp t]
2699          ["Mark all" gnus-uu-mark-all t]
2700          ["Mark buffer" gnus-uu-mark-buffer t]
2701          ["Mark sparse" gnus-uu-mark-sparse t]
2702          ["Mark thread" gnus-uu-mark-thread t]
2703          ["Unmark thread" gnus-uu-unmark-thread t]
2704          ("Process Mark Sets"
2705           ["Kill" gnus-summary-kill-process-mark t]
2706           ["Yank" gnus-summary-yank-process-mark
2707            gnus-newsgroup-process-stack]
2708           ["Save" gnus-summary-save-process-mark t]
2709           ["Run command on marked..." gnus-summary-universal-argument t]))
2710         ("Registry Marks")
2711         ("Scroll article"
2712          ["Page forward" gnus-summary-next-page
2713           ,@(if (featurep 'xemacs) '(t)
2714               '(:help "Show next page of article"))]
2715          ["Page backward" gnus-summary-prev-page
2716           ,@(if (featurep 'xemacs) '(t)
2717               '(:help "Show previous page of article"))]
2718          ["Line forward" gnus-summary-scroll-up t])
2719         ("Move"
2720          ["Next unread article" gnus-summary-next-unread-article t]
2721          ["Previous unread article" gnus-summary-prev-unread-article t]
2722          ["Next article" gnus-summary-next-article t]
2723          ["Previous article" gnus-summary-prev-article t]
2724          ["Next unread subject" gnus-summary-next-unread-subject t]
2725          ["Previous unread subject" gnus-summary-prev-unread-subject t]
2726          ["Next article same subject" gnus-summary-next-same-subject t]
2727          ["Previous article same subject" gnus-summary-prev-same-subject t]
2728          ["First unread article" gnus-summary-first-unread-article t]
2729          ["Best unread article" gnus-summary-best-unread-article t]
2730          ["Go to subject number..." gnus-summary-goto-subject t]
2731          ["Go to article number..." gnus-summary-goto-article t]
2732          ["Go to the last article" gnus-summary-goto-last-article t]
2733          ["Pop article off history" gnus-summary-pop-article t])
2734         ("Sort"
2735          ["Sort by number" gnus-summary-sort-by-number t]
2736          ["Sort by most recent number" gnus-summary-sort-by-most-recent-number t]
2737          ["Sort by author" gnus-summary-sort-by-author t]
2738          ["Sort by recipient" gnus-summary-sort-by-recipient t]
2739          ["Sort by subject" gnus-summary-sort-by-subject t]
2740          ["Sort by date" gnus-summary-sort-by-date t]
2741          ["Sort by most recent date" gnus-summary-sort-by-most-recent-date t]
2742          ["Sort by score" gnus-summary-sort-by-score t]
2743          ["Sort by lines" gnus-summary-sort-by-lines t]
2744          ["Sort by characters" gnus-summary-sort-by-chars t]
2745          ["Randomize" gnus-summary-sort-by-random t]
2746          ["Original sort" gnus-summary-sort-by-original t])
2747         ("Help"
2748          ["Describe group" gnus-summary-describe-group t]
2749          ["Read manual" gnus-info-find-node t])
2750         ("Modes"
2751          ["Pick and read" gnus-pick-mode t]
2752          ["Binary" gnus-binary-mode t])
2753         ("Regeneration"
2754          ["Regenerate" gnus-summary-prepare t]
2755          ["Insert cached articles" gnus-summary-insert-cached-articles t]
2756          ["Insert dormant articles" gnus-summary-insert-dormant-articles t]
2757          ["Insert ticked articles" gnus-summary-insert-ticked-articles t]
2758          ["Toggle threading" gnus-summary-toggle-threads t])
2759         ["See old articles" gnus-summary-insert-old-articles t]
2760         ["See new articles" gnus-summary-insert-new-articles t]
2761         ["Filter articles..." gnus-summary-execute-command t]
2762         ["Run command on articles..." gnus-summary-universal-argument t]
2763         ["Search articles forward..." gnus-summary-search-article-forward t]
2764         ["Search articles backward..." gnus-summary-search-article-backward t]
2765         ["Toggle line truncation" gnus-summary-toggle-truncation t]
2766         ["Expand window" gnus-summary-expand-window t]
2767         ["Expire expirable articles" gnus-summary-expire-articles
2768          (gnus-check-backend-function
2769           'request-expire-articles gnus-newsgroup-name)]
2770         ["Edit local kill file" gnus-summary-edit-local-kill t]
2771         ["Edit main kill file" gnus-summary-edit-global-kill t]
2772         ["Edit group parameters" gnus-summary-edit-parameters t]
2773         ["Customize group parameters" gnus-summary-customize-parameters t]
2774         ["Send a bug report" gnus-bug t]
2775         ("Exit"
2776          ["Catchup and exit" gnus-summary-catchup-and-exit
2777           ,@(if (featurep 'xemacs) '(t)
2778               '(:help "Mark unread articles in this group as read, then exit"))]
2779          ["Catchup all and exit" gnus-summary-catchup-all-and-exit t]
2780          ["Catchup and goto next" gnus-summary-catchup-and-goto-next-group t]
2781          ["Catchup and goto prev" gnus-summary-catchup-and-goto-prev-group t]
2782          ["Exit group" gnus-summary-exit
2783           ,@(if (featurep 'xemacs) '(t)
2784               '(:help "Exit current group, return to group selection mode"))]
2785          ["Exit group without updating" gnus-summary-exit-no-update t]
2786          ["Exit and goto next group" gnus-summary-next-group t]
2787          ["Exit and goto prev group" gnus-summary-prev-group t]
2788          ["Reselect group" gnus-summary-reselect-current-group t]
2789          ["Rescan group" gnus-summary-rescan-group t]
2790          ["Update dribble" gnus-summary-save-newsrc t])))
2791
2792     (gnus-run-hooks 'gnus-summary-menu-hook)))
2793
2794 (defvar gnus-summary-tool-bar-map nil)
2795
2796 ;; Note: The :set function in the `gnus-summary-tool-bar*' variables will only
2797 ;; affect _new_ message buffers.  We might add a function that walks thru all
2798 ;; summary-mode buffers and force the update.
2799 (defun gnus-summary-tool-bar-update (&optional symbol value)
2800   "Update summary mode toolbar.
2801 Setter function for custom variables."
2802   (setq-default gnus-summary-tool-bar-map nil)
2803   (when symbol
2804     ;; When used as ":set" function:
2805     (set-default symbol value))
2806   (when (gnus-buffer-live-p gnus-summary-buffer)
2807     (with-current-buffer gnus-summary-buffer
2808       (gnus-summary-make-tool-bar))))
2809
2810 (defcustom gnus-summary-tool-bar (if (eq gmm-tool-bar-style 'gnome)
2811                                      'gnus-summary-tool-bar-gnome
2812                                    'gnus-summary-tool-bar-retro)
2813   "Specifies the Gnus summary tool bar.
2814
2815 It can be either a list or a symbol refering to a list.  See
2816 `gmm-tool-bar-from-list' for the format of the list.  The
2817 default key map is `gnus-summary-mode-map'.
2818
2819 Pre-defined symbols include `gnus-summary-tool-bar-gnome' and
2820 `gnus-summary-tool-bar-retro'."
2821   :type '(choice (const :tag "GNOME style" gnus-summary-tool-bar-gnome)
2822                  (const :tag "Retro look"  gnus-summary-tool-bar-retro)
2823                  (repeat :tag "User defined list" gmm-tool-bar-item)
2824                  (symbol))
2825   :version "23.1" ;; No Gnus
2826   :initialize 'custom-initialize-default
2827   :set 'gnus-summary-tool-bar-update
2828   :group 'gnus-summary)
2829
2830 (defcustom gnus-summary-tool-bar-gnome
2831   '((gnus-summary-post-news "mail/compose" nil)
2832     (gnus-summary-insert-new-articles "mail/inbox" nil
2833                                       :visible (or (not gnus-agent)
2834                                                    gnus-plugged))
2835     (gnus-summary-reply-with-original "mail/reply")
2836     (gnus-summary-reply "mail/reply" nil :visible nil)
2837     (gnus-summary-followup-with-original "mail/reply-all")
2838     (gnus-summary-followup "mail/reply-all" nil :visible nil)
2839     (gnus-summary-mail-forward "mail/forward")
2840     (gnus-summary-save-article "mail/save")
2841     (gnus-summary-search-article-forward "search" nil :visible nil)
2842     (gnus-summary-print-article "print")
2843     (gnus-summary-tick-article-forward "flag-followup" nil :visible nil)
2844     ;; Some new commands that may need more suitable icons:
2845     (gnus-summary-save-newsrc "save" nil :visible nil)
2846     ;; (gnus-summary-show-article "stock_message-display" nil :visible nil)
2847     (gnus-summary-prev-article "left-arrow")
2848     (gnus-summary-next-article "right-arrow")
2849     (gnus-summary-next-page "next-page")
2850     ;; (gnus-summary-enter-digest-group "right_arrow" nil :visible nil)
2851     ;;
2852     ;; Maybe some sort-by-... could be added:
2853     ;; (gnus-summary-sort-by-author "sort-a-z" nil :visible nil)
2854     ;; (gnus-summary-sort-by-date "sort-1-9" nil :visible nil)
2855     (gnus-summary-mark-as-expirable
2856      "delete" nil
2857      :visible (gnus-check-backend-function 'request-expire-articles
2858                                            gnus-newsgroup-name))
2859     (gnus-summary-mark-as-spam
2860      "mail/spam" t
2861      :visible (and (fboundp 'spam-group-ham-contents-p)
2862                    (spam-group-ham-contents-p gnus-newsgroup-name))
2863      :help "Mark as spam")
2864     (gnus-summary-mark-as-read-forward
2865      "mail/not-spam" nil
2866      :visible (and (fboundp 'spam-group-spam-contents-p)
2867                    (spam-group-spam-contents-p gnus-newsgroup-name)))
2868     ;;
2869     (gnus-summary-exit "exit")
2870     (gmm-customize-mode "preferences" t :help "Edit mode preferences")
2871     (gnus-info-find-node "help"))
2872   "List of functions for the summary tool bar (GNOME style).
2873
2874 See `gmm-tool-bar-from-list' for the format of the list."
2875   :type '(repeat gmm-tool-bar-item)
2876   :version "23.1" ;; No Gnus
2877   :initialize 'custom-initialize-default
2878   :set 'gnus-summary-tool-bar-update
2879   :group 'gnus-summary)
2880
2881 (defcustom gnus-summary-tool-bar-retro
2882   '((gnus-summary-prev-unread-article "gnus/prev-ur")
2883     (gnus-summary-next-unread-article "gnus/next-ur")
2884     (gnus-summary-post-news "gnus/post")
2885     (gnus-summary-followup-with-original "gnus/fuwo")
2886     (gnus-summary-followup "gnus/followup")
2887     (gnus-summary-reply-with-original "gnus/reply-wo")
2888     (gnus-summary-reply "gnus/reply")
2889     (gnus-summary-caesar-message "gnus/rot13")
2890     (gnus-uu-decode-uu "gnus/uu-decode")
2891     (gnus-summary-save-article-file "gnus/save-aif")
2892     (gnus-summary-save-article "gnus/save-art")
2893     (gnus-uu-post-news "gnus/uu-post")
2894     (gnus-summary-catchup "gnus/catchup")
2895     (gnus-summary-catchup-and-exit "gnus/cu-exit")
2896     (gnus-summary-exit "gnus/exit-summ")
2897     ;; Some new command that may need more suitable icons:
2898     (gnus-summary-print-article "gnus/print" nil :visible nil)
2899     (gnus-summary-mark-as-expirable "gnus/close" nil :visible nil)
2900     (gnus-summary-save-newsrc "gnus/save" nil :visible nil)
2901     ;; (gnus-summary-enter-digest-group "gnus/right_arrow" nil :visible nil)
2902     (gnus-summary-search-article-forward "gnus/search" nil :visible nil)
2903     ;; (gnus-summary-insert-new-articles "gnus/paste" nil :visible nil)
2904     ;; (gnus-summary-toggle-threads "gnus/open" nil :visible nil)
2905     ;;
2906     (gnus-info-find-node "gnus/help" nil :visible nil))
2907   "List of functions for the summary tool bar (retro look).
2908
2909 See `gmm-tool-bar-from-list' for the format of the list."
2910   :type '(repeat gmm-tool-bar-item)
2911   :version "23.1" ;; No Gnus
2912   :initialize 'custom-initialize-default
2913   :set 'gnus-summary-tool-bar-update
2914   :group 'gnus-summary)
2915
2916 (defcustom gnus-summary-tool-bar-zap-list t
2917   "List of icon items from the global tool bar.
2918 These items are not displayed in the Gnus summary mode tool bar.
2919
2920 See `gmm-tool-bar-from-list' for the format of the list."
2921   :type 'gmm-tool-bar-zap-list
2922   :version "23.1" ;; No Gnus
2923   :initialize 'custom-initialize-default
2924   :set 'gnus-summary-tool-bar-update
2925   :group 'gnus-summary)
2926
2927 (defvar image-load-path)
2928 (defvar tool-bar-map)
2929
2930 (defun gnus-summary-make-tool-bar (&optional force)
2931   "Make a summary mode tool bar from `gnus-summary-tool-bar'.
2932 When FORCE, rebuild the tool bar."
2933   (when (and (not (featurep 'xemacs))
2934              (boundp 'tool-bar-mode)
2935              tool-bar-mode
2936              (or (not gnus-summary-tool-bar-map) force))
2937     (let* ((load-path
2938             (gmm-image-load-path-for-library "gnus"
2939                                              "mail/save.xpm"
2940                                              nil t))
2941            (image-load-path (cons (car load-path)
2942                                   (when (boundp 'image-load-path)
2943                                     image-load-path)))
2944            (map (gmm-tool-bar-from-list gnus-summary-tool-bar
2945                                         gnus-summary-tool-bar-zap-list
2946                                         'gnus-summary-mode-map)))
2947       (when map
2948         ;; Need to set `gnus-summary-tool-bar-map' because `gnus-article-mode'
2949         ;; uses it's value.
2950         (setq gnus-summary-tool-bar-map map))))
2951   (set (make-local-variable 'tool-bar-map) gnus-summary-tool-bar-map))
2952
2953 (defun gnus-score-set-default (var value)
2954   "A version of set that updates the GNU Emacs menu-bar."
2955   (set var value)
2956   ;; It is the message that forces the active status to be updated.
2957   (message ""))
2958
2959 (defun gnus-make-score-map (type)
2960   "Make a summary score map of type TYPE."
2961   (if t
2962       nil
2963     (let ((headers '(("author" "from" string)
2964                      ("subject" "subject" string)
2965                      ("article body" "body" string)
2966                      ("article head" "head" string)
2967                      ("xref" "xref" string)
2968                      ("extra header" "extra" string)
2969                      ("lines" "lines" number)
2970                      ("followups to author" "followup" string)))
2971           (types '((number ("less than" <)
2972                            ("greater than" >)
2973                            ("equal" =))
2974                    (string ("substring" s)
2975                            ("exact string" e)
2976                            ("fuzzy string" f)
2977                            ("regexp" r))))
2978           (perms '(("temporary" (current-time-string))
2979                    ("permanent" nil)
2980                    ("immediate" now)))
2981           header)
2982       (list
2983        (apply
2984         'nconc
2985         (list
2986          (if (eq type 'lower)
2987              "Lower score"
2988            "Increase score"))
2989         (let (outh)
2990           (while headers
2991             (setq header (car headers))
2992             (setq outh
2993                   (cons
2994                    (apply
2995                     'nconc
2996                     (list (car header))
2997                     (let ((ts (cdr (assoc (nth 2 header) types)))
2998                           outt)
2999                       (while ts
3000                         (setq outt
3001                               (cons
3002                                (apply
3003                                 'nconc
3004                                 (list (caar ts))
3005                                 (let ((ps perms)
3006                                       outp)
3007                                   (while ps
3008                                     (setq outp
3009                                           (cons
3010                                            (vector
3011                                             (caar ps)
3012                                             (list
3013                                              'gnus-summary-score-entry
3014                                              (nth 1 header)
3015                                              (if (or (string= (nth 1 header)
3016                                                               "head")
3017                                                      (string= (nth 1 header)
3018                                                               "body"))
3019                                                  ""
3020                                                (list 'gnus-summary-header
3021                                                      (nth 1 header)))
3022                                              (list 'quote (nth 1 (car ts)))
3023                                              (list 'gnus-score-delta-default
3024                                                    nil)
3025                                              (nth 1 (car ps))
3026                                              t)
3027                                             t)
3028                                            outp))
3029                                     (setq ps (cdr ps)))
3030                                   (list (nreverse outp))))
3031                                outt))
3032                         (setq ts (cdr ts)))
3033                       (list (nreverse outt))))
3034                    outh))
3035             (setq headers (cdr headers)))
3036           (list (nreverse outh))))))))
3037
3038
3039 (declare-function turn-on-gnus-mailing-list-mode "gnus-ml" ())
3040 (defvar bookmark-make-record-function)
3041 \f
3042
3043 (defun gnus-summary-mode (&optional group)
3044   "Major mode for reading articles.
3045
3046 All normal editing commands are switched off.
3047 \\<gnus-summary-mode-map>
3048 Each line in this buffer represents one article.  To read an
3049 article, you can, for instance, type `\\[gnus-summary-next-page]'.  To move forwards
3050 and backwards while displaying articles, type `\\[gnus-summary-next-unread-article]' and `\\[gnus-summary-prev-unread-article]',
3051 respectively.
3052
3053 You can also post articles and send mail from this buffer.  To
3054 follow up an article, type `\\[gnus-summary-followup]'.  To mail a reply to the author
3055 of an article, type `\\[gnus-summary-reply]'.
3056
3057 There are approx. one gazillion commands you can execute in this
3058 buffer; read the info pages for more information (`\\[gnus-info-find-node]').
3059
3060 The following commands are available:
3061
3062 \\{gnus-summary-mode-map}"
3063   (interactive)
3064   (kill-all-local-variables)
3065   (let ((gnus-summary-local-variables gnus-newsgroup-variables))
3066     (gnus-summary-make-local-variables))
3067   (gnus-summary-make-local-variables)
3068   (setq gnus-newsgroup-name group)
3069   (when (gnus-visual-p 'summary-menu 'menu)
3070     (gnus-summary-make-menu-bar)
3071     (gnus-summary-make-tool-bar))
3072   (gnus-make-thread-indent-array)
3073   (gnus-simplify-mode-line)
3074   (setq major-mode 'gnus-summary-mode)
3075   (setq mode-name "Summary")
3076   (use-local-map gnus-summary-mode-map)
3077   (buffer-disable-undo)
3078   (setq buffer-read-only t              ;Disable modification
3079         show-trailing-whitespace nil)
3080   (setq truncate-lines t)
3081   (add-to-invisibility-spec '(gnus-sum . t))
3082   (gnus-summary-set-display-table)
3083   (gnus-set-default-directory)
3084   (make-local-variable 'gnus-summary-line-format)
3085   (make-local-variable 'gnus-summary-line-format-spec)
3086   (make-local-variable 'gnus-summary-dummy-line-format)
3087   (make-local-variable 'gnus-summary-dummy-line-format-spec)
3088   (make-local-variable 'gnus-summary-mark-positions)
3089   (gnus-make-local-hook 'pre-command-hook)
3090   (add-hook 'pre-command-hook 'gnus-set-global-variables nil t)
3091   (gnus-run-mode-hooks 'gnus-summary-mode-hook)
3092   (turn-on-gnus-mailing-list-mode)
3093   (mm-enable-multibyte)
3094   (set (make-local-variable 'bookmark-make-record-function)
3095        'gnus-summary-bookmark-make-record)
3096   (gnus-update-format-specifications nil 'summary 'summary-mode 'summary-dummy)
3097   (gnus-update-summary-mark-positions))
3098
3099 (defun gnus-summary-make-local-variables ()
3100   "Make all the local summary buffer variables."
3101   (let (global)
3102     (dolist (local gnus-summary-local-variables)
3103       (if (consp local)
3104           (progn
3105             (if (eq (cdr local) 'global)
3106                 ;; Copy the global value of the variable.
3107                 (setq global (symbol-value (car local)))
3108               ;; Use the value from the list.
3109               (setq global (eval (cdr local))))
3110             (set (make-local-variable (car local)) global))
3111         ;; Simple nil-valued local variable.
3112         (set (make-local-variable local) nil)))))
3113
3114 ;; Summary data functions.
3115
3116 (defmacro gnus-data-number (data)
3117   `(car ,data))
3118
3119 (defmacro gnus-data-set-number (data number)
3120   `(setcar ,data ,number))
3121
3122 (defmacro gnus-data-mark (data)
3123   `(nth 1 ,data))
3124
3125 (defmacro gnus-data-set-mark (data mark)
3126   `(setcar (nthcdr 1 ,data) ,mark))
3127
3128 (defmacro gnus-data-pos (data)
3129   `(nth 2 ,data))
3130
3131 (defmacro gnus-data-set-pos (data pos)
3132   `(setcar (nthcdr 2 ,data) ,pos))
3133
3134 (defmacro gnus-data-header (data)
3135   `(nth 3 ,data))
3136
3137 (defmacro gnus-data-set-header (data header)
3138   `(setf (nth 3 ,data) ,header))
3139
3140 (defmacro gnus-data-level (data)
3141   `(nth 4 ,data))
3142
3143 (defmacro gnus-data-unread-p (data)
3144   `(= (nth 1 ,data) gnus-unread-mark))
3145
3146 (defmacro gnus-data-read-p (data)
3147   `(/= (nth 1 ,data) gnus-unread-mark))
3148
3149 (defmacro gnus-data-pseudo-p (data)
3150   `(consp (nth 3 ,data)))
3151
3152 (defmacro gnus-data-find (number)
3153   `(assq ,number gnus-newsgroup-data))
3154
3155 (defmacro gnus-data-find-list (number &optional data)
3156   `(let ((bdata ,(or data 'gnus-newsgroup-data)))
3157      (memq (assq ,number bdata)
3158            bdata)))
3159
3160 (defmacro gnus-data-make (number mark pos header level)
3161   `(list ,number ,mark ,pos ,header ,level))
3162
3163 (defun gnus-data-enter (after-article number mark pos header level offset)
3164   (let ((data (gnus-data-find-list after-article)))
3165     (unless data
3166       (error "No such article: %d" after-article))
3167     (setcdr data (cons (gnus-data-make number mark pos header level)
3168                        (cdr data)))
3169     (setq gnus-newsgroup-data-reverse nil)
3170     (gnus-data-update-list (cddr data) offset)))
3171
3172 (defun gnus-data-enter-list (after-article list &optional offset)
3173   (when list
3174     (let ((data (and after-article (gnus-data-find-list after-article)))
3175           (ilist list))
3176       (if (not (or data
3177                    after-article))
3178           (let ((odata gnus-newsgroup-data))
3179             (setq gnus-newsgroup-data (nconc list gnus-newsgroup-data))
3180             (when offset
3181               (gnus-data-update-list odata offset)))
3182         ;; Find the last element in the list to be spliced into the main
3183         ;; list.
3184         (setq list (last list))
3185         (if (not data)
3186             (progn
3187               (setcdr list gnus-newsgroup-data)
3188               (setq gnus-newsgroup-data ilist)
3189               (when offset
3190                 (gnus-data-update-list (cdr list) offset)))
3191           (setcdr list (cdr data))
3192           (setcdr data ilist)
3193           (when offset
3194             (gnus-data-update-list (cdr list) offset))))
3195       (setq gnus-newsgroup-data-reverse nil))))
3196
3197 (defun gnus-data-remove (article &optional offset)
3198   (let ((data gnus-newsgroup-data))
3199     (if (= (gnus-data-number (car data)) article)
3200         (progn
3201           (setq gnus-newsgroup-data (cdr gnus-newsgroup-data)
3202                 gnus-newsgroup-data-reverse nil)
3203           (when offset
3204             (gnus-data-update-list gnus-newsgroup-data offset)))
3205       (while (cdr data)
3206         (when (= (gnus-data-number (cadr data)) article)
3207           (setcdr data (cddr data))
3208           (when offset
3209             (gnus-data-update-list (cdr data) offset))
3210           (setq data nil
3211                 gnus-newsgroup-data-reverse nil))
3212         (setq data (cdr data))))))
3213
3214 (defmacro gnus-data-list (backward)
3215   `(if ,backward
3216        (or gnus-newsgroup-data-reverse
3217            (setq gnus-newsgroup-data-reverse
3218                  (reverse gnus-newsgroup-data)))
3219      gnus-newsgroup-data))
3220
3221 (defun gnus-data-update-list (data offset)
3222   "Add OFFSET to the POS of all data entries in DATA."
3223   (setq gnus-newsgroup-data-reverse nil)
3224   (while data
3225     (setcar (nthcdr 2 (car data)) (+ offset (nth 2 (car data))))
3226     (setq data (cdr data))))
3227
3228 (defun gnus-summary-article-pseudo-p (article)
3229   "Say whether this article is a pseudo article or not."
3230   (not (vectorp (gnus-data-header (gnus-data-find article)))))
3231
3232 (defmacro gnus-summary-article-sparse-p (article)
3233   "Say whether this article is a sparse article or not."
3234   `(memq ,article gnus-newsgroup-sparse))
3235
3236 (defmacro gnus-summary-article-ancient-p (article)
3237   "Say whether this article is a sparse article or not."
3238   `(memq ,article gnus-newsgroup-ancient))
3239
3240 (defun gnus-article-parent-p (number)
3241   "Say whether this article is a parent or not."
3242   (let ((data (gnus-data-find-list number)))
3243     (and (cdr data)              ; There has to be an article after...
3244          (< (gnus-data-level (car data)) ; And it has to have a higher level.
3245             (gnus-data-level (nth 1 data))))))
3246
3247 (defun gnus-article-children (number)
3248   "Return a list of all children to NUMBER."
3249   (let* ((data (gnus-data-find-list number))
3250          (level (gnus-data-level (car data)))
3251          children)
3252     (setq data (cdr data))
3253     (while (and data
3254                 (= (gnus-data-level (car data)) (1+ level)))
3255       (push (gnus-data-number (car data)) children)
3256       (setq data (cdr data)))
3257     children))
3258
3259 (defmacro gnus-summary-skip-intangible ()
3260   "If the current article is intangible, then jump to a different article."
3261   '(let ((to (get-text-property (point) 'gnus-intangible)))
3262      (and to (gnus-summary-goto-subject to))))
3263
3264 (defmacro gnus-summary-article-intangible-p ()
3265   "Say whether this article is intangible or not."
3266   '(get-text-property (point) 'gnus-intangible))
3267
3268 (defun gnus-article-read-p (article)
3269   "Say whether ARTICLE is read or not."
3270   (not (or (memq article gnus-newsgroup-marked)
3271            (memq article gnus-newsgroup-spam-marked)
3272            (memq article gnus-newsgroup-unreads)
3273            (memq article gnus-newsgroup-unselected)
3274            (memq article gnus-newsgroup-dormant))))
3275
3276 ;; Some summary mode macros.
3277
3278 (defmacro gnus-summary-article-number ()
3279   "The article number of the article on the current line.
3280 If there isn't an article number here, then we return the current
3281 article number."
3282   '(progn
3283      (gnus-summary-skip-intangible)
3284      (or (get-text-property (point) 'gnus-number)
3285          (gnus-summary-last-subject))))
3286
3287 (defmacro gnus-summary-article-header (&optional number)
3288   "Return the header of article NUMBER."
3289   `(gnus-data-header (gnus-data-find
3290                       ,(or number '(gnus-summary-article-number)))))
3291
3292 (defmacro gnus-summary-thread-level (&optional number)
3293   "Return the level of thread that starts with article NUMBER."
3294   `(if (and (eq gnus-summary-make-false-root 'dummy)
3295             (get-text-property (point) 'gnus-intangible))
3296        0
3297      (gnus-data-level (gnus-data-find
3298                        ,(or number '(gnus-summary-article-number))))))
3299
3300 (defmacro gnus-summary-article-mark (&optional number)
3301   "Return the mark of article NUMBER."
3302   `(gnus-data-mark (gnus-data-find
3303                     ,(or number '(gnus-summary-article-number)))))
3304
3305 (defmacro gnus-summary-article-pos (&optional number)
3306   "Return the position of the line of article NUMBER."
3307   `(gnus-data-pos (gnus-data-find
3308                    ,(or number '(gnus-summary-article-number)))))
3309
3310 (defalias 'gnus-summary-subject-string 'gnus-summary-article-subject)
3311 (defmacro gnus-summary-article-subject (&optional number)
3312   "Return current subject string or nil if nothing."
3313   `(let ((headers
3314           ,(if number
3315                `(gnus-data-header (assq ,number gnus-newsgroup-data))
3316              '(gnus-data-header (assq (gnus-summary-article-number)
3317                                       gnus-newsgroup-data)))))
3318      (and headers
3319           (vectorp headers)
3320           (mail-header-subject headers))))
3321
3322 (defmacro gnus-summary-article-score (&optional number)
3323   "Return current article score."
3324   `(or (cdr (assq ,(or number '(gnus-summary-article-number))
3325                   gnus-newsgroup-scored))
3326        gnus-summary-default-score 0))
3327
3328 (defun gnus-summary-article-children (&optional number)
3329   "Return a list of article numbers that are children of article NUMBER."
3330   (let* ((data (gnus-data-find-list (or number (gnus-summary-article-number))))
3331          (level (gnus-data-level (car data)))
3332          l children)
3333     (while (and (setq data (cdr data))
3334                 (> (setq l (gnus-data-level (car data))) level))
3335       (and (= (1+ level) l)
3336            (push (gnus-data-number (car data))
3337                  children)))
3338     (nreverse children)))
3339
3340 (defun gnus-summary-article-parent (&optional number)
3341   "Return the article number of the parent of article NUMBER."
3342   (let* ((data (gnus-data-find-list (or number (gnus-summary-article-number))
3343                                     (gnus-data-list t)))
3344          (level (gnus-data-level (car data))))
3345     (if (zerop level)
3346         ()                              ; This is a root.
3347       ;; We search until we find an article with a level less than
3348       ;; this one.  That function has to be the parent.
3349       (while (and (setq data (cdr data))
3350                   (not (< (gnus-data-level (car data)) level))))
3351       (and data (gnus-data-number (car data))))))
3352
3353 (defun gnus-unread-mark-p (mark)
3354   "Say whether MARK is the unread mark."
3355   (= mark gnus-unread-mark))
3356
3357 (defun gnus-read-mark-p (mark)
3358   "Say whether MARK is one of the marks that mark as read.
3359 This is all marks except unread, ticked, dormant, and expirable."
3360   (not (or (= mark gnus-unread-mark)
3361            (= mark gnus-ticked-mark)
3362            (= mark gnus-spam-mark)
3363            (= mark gnus-dormant-mark)
3364            (= mark gnus-expirable-mark))))
3365
3366 (defmacro gnus-article-mark (number)
3367   "Return the MARK of article NUMBER.
3368 This macro should only be used when computing the mark the \"first\"
3369 time; i.e., when generating the summary lines.  After that,
3370 `gnus-summary-article-mark' should be used to examine the
3371 marks of articles."
3372   `(cond
3373     ((memq ,number gnus-newsgroup-unsendable) gnus-unsendable-mark)
3374     ((memq ,number gnus-newsgroup-downloadable) gnus-downloadable-mark)
3375     ((memq ,number gnus-newsgroup-unreads) gnus-unread-mark)
3376     ((memq ,number gnus-newsgroup-marked) gnus-ticked-mark)
3377     ((memq ,number gnus-newsgroup-spam-marked) gnus-spam-mark)
3378     ((memq ,number gnus-newsgroup-dormant) gnus-dormant-mark)
3379     ((memq ,number gnus-newsgroup-expirable) gnus-expirable-mark)
3380     (t (or (cdr (assq ,number gnus-newsgroup-reads))
3381            gnus-ancient-mark))))
3382
3383 ;; Saving hidden threads.
3384
3385 (defmacro gnus-save-hidden-threads (&rest forms)
3386   "Save hidden threads, eval FORMS, and restore the hidden threads."
3387   (let ((config (make-symbol "config")))
3388     `(let ((,config (gnus-hidden-threads-configuration)))
3389        (unwind-protect
3390            (save-excursion
3391              ,@forms)
3392          (gnus-restore-hidden-threads-configuration ,config)))))
3393 (put 'gnus-save-hidden-threads 'lisp-indent-function 0)
3394 (put 'gnus-save-hidden-threads 'edebug-form-spec '(body))
3395
3396 (defun gnus-data-compute-positions ()
3397   "Compute the positions of all articles."
3398   (setq gnus-newsgroup-data-reverse nil)
3399   (let ((data gnus-newsgroup-data))
3400     (save-excursion
3401       (gnus-save-hidden-threads
3402         (gnus-summary-show-all-threads)
3403         (goto-char (point-min))
3404         (while data
3405           (while (get-text-property (point) 'gnus-intangible)
3406             (forward-line 1))
3407           (gnus-data-set-pos (car data) (+ (point) 3))
3408           (setq data (cdr data))
3409           (forward-line 1))))))
3410
3411 (defun gnus-hidden-threads-configuration ()
3412   "Return the current hidden threads configuration."
3413   (save-excursion
3414     (let (config)
3415       (goto-char (point-min))
3416       (while (not (eobp))
3417         (when (eq (get-char-property (point-at-eol) 'invisible) 'gnus-sum)
3418           (push (save-excursion (forward-line 0) (point)) config))
3419         (forward-line 1))
3420       config)))
3421
3422 (defun gnus-restore-hidden-threads-configuration (config)
3423   "Restore hidden threads configuration from CONFIG."
3424   (save-excursion
3425     (let (point (inhibit-read-only t))
3426       (while (setq point (pop config))
3427         (goto-char point)
3428         (gnus-summary-hide-thread)))))
3429
3430 ;; Various summary mode internalish functions.
3431
3432 (defun gnus-mouse-pick-article (e)
3433   (interactive "e")
3434   (mouse-set-point e)
3435   (gnus-summary-next-page nil t))
3436
3437 (defun gnus-summary-set-display-table ()
3438   "Change the display table.
3439 Odd characters have a tendency to mess
3440 up nicely formatted displays - we make all possible glyphs
3441 display only a single character."
3442
3443   ;; We start from the standard display table, if any.
3444   (let ((table (or (copy-sequence standard-display-table)
3445                    (make-display-table)))
3446         (i 32))
3447     ;; Nix out all the control chars...
3448     (while (>= (setq i (1- i)) 0)
3449       (gnus-put-display-table i [??] table))
3450    ;; ... but not newline and cr, of course.  (cr is necessary for the
3451     ;; selective display).
3452     (gnus-put-display-table ?\n nil table)
3453     (gnus-put-display-table ?\r nil table)
3454     ;; We keep TAB as well.
3455     (gnus-put-display-table ?\t nil table)
3456     ;; We nix out any glyphs 127 through 255, or 127 through 159 in
3457     ;; Emacs 23 (unicode), that are not set already.
3458     (let ((i (if (ignore-errors (= (make-char 'latin-iso8859-1 160) 160))
3459                  160
3460                256)))
3461       (while (>= (setq i (1- i)) 127)
3462         ;; Only modify if the entry is nil.
3463         (unless (gnus-get-display-table i table)
3464           (gnus-put-display-table i [??] table))))
3465     (setq buffer-display-table table)))
3466
3467 (defun gnus-summary-set-article-display-arrow (pos)
3468   "Update the overlay arrow to point to line at position POS."
3469   (when gnus-summary-display-arrow
3470     (make-local-variable 'overlay-arrow-position)
3471     (make-local-variable 'overlay-arrow-string)
3472     (save-excursion
3473       (goto-char pos)
3474       (beginning-of-line)
3475       (unless overlay-arrow-position
3476         (setq overlay-arrow-position (make-marker)))
3477       (setq overlay-arrow-string "=>"
3478             overlay-arrow-position (set-marker overlay-arrow-position
3479                                                (point)
3480                                                (current-buffer))))))
3481
3482 (defun gnus-summary-setup-buffer (group)
3483   "Initialize summary buffer."
3484   (let ((buffer (gnus-summary-buffer-name group))
3485         (dead-name (concat "*Dead Summary "
3486                            (gnus-group-decoded-name group) "*")))
3487     ;; If a dead summary buffer exists, we kill it.
3488     (when (gnus-buffer-live-p dead-name)
3489       (gnus-kill-buffer dead-name))
3490     (if (get-buffer buffer)
3491         (progn
3492           (set-buffer buffer)
3493           (setq gnus-summary-buffer (current-buffer))
3494           (not gnus-newsgroup-prepared))
3495       ;; Fix by Sudish Joseph <joseph@cis.ohio-state.edu>
3496       (setq gnus-summary-buffer (set-buffer (gnus-get-buffer-create buffer)))
3497       (gnus-summary-mode group)
3498       (when (gnus-group-quit-config group)
3499         (set (make-local-variable 'gnus-single-article-buffer) nil))
3500       (make-local-variable 'gnus-article-buffer)
3501       (make-local-variable 'gnus-article-current)
3502       (make-local-variable 'gnus-original-article-buffer)
3503       (setq gnus-newsgroup-name group)
3504       ;; Set any local variables in the group parameters.
3505       (gnus-summary-set-local-parameters gnus-newsgroup-name)
3506       t)))
3507
3508 (defun gnus-set-global-variables ()
3509   "Set the global equivalents of the buffer-local variables.
3510 They are set to the latest values they had.  These reflect the summary
3511 buffer that was in action when the last article was fetched."
3512   (when (eq major-mode 'gnus-summary-mode)
3513     (setq gnus-summary-buffer (current-buffer))
3514     (let ((name gnus-newsgroup-name)
3515           (marked gnus-newsgroup-marked)
3516           (spam gnus-newsgroup-spam-marked)
3517           (unread gnus-newsgroup-unreads)
3518           (headers gnus-current-headers)
3519           (data gnus-newsgroup-data)
3520           (summary gnus-summary-buffer)
3521           (article-buffer gnus-article-buffer)
3522           (original gnus-original-article-buffer)
3523           (gac gnus-article-current)
3524           (reffed gnus-reffed-article-number)
3525           (score-file gnus-current-score-file)
3526           (default-charset gnus-newsgroup-charset)
3527           vlist)
3528       (let ((locals gnus-newsgroup-variables))
3529         (while locals
3530           (if (consp (car locals))
3531               (push (eval (caar locals)) vlist)
3532             (push (eval (car locals)) vlist))
3533           (setq locals (cdr locals)))
3534         (setq vlist (nreverse vlist)))
3535       (with-current-buffer gnus-group-buffer
3536         (setq gnus-newsgroup-name name
3537               gnus-newsgroup-marked marked
3538               gnus-newsgroup-spam-marked spam
3539               gnus-newsgroup-unreads unread
3540               gnus-current-headers headers
3541               gnus-newsgroup-data data
3542               gnus-article-current gac
3543               gnus-summary-buffer summary
3544               gnus-article-buffer article-buffer
3545               gnus-original-article-buffer original
3546               gnus-reffed-article-number reffed
3547               gnus-current-score-file score-file
3548               gnus-newsgroup-charset default-charset)
3549         (let ((locals gnus-newsgroup-variables))
3550           (while locals
3551             (if (consp (car locals))
3552                 (set (caar locals) (pop vlist))
3553               (set (car locals) (pop vlist)))
3554             (setq locals (cdr locals))))
3555         ;; The article buffer also has local variables.
3556         (when (gnus-buffer-live-p gnus-article-buffer)
3557           (set-buffer gnus-article-buffer)
3558           (setq gnus-summary-buffer summary))))))
3559
3560 (defun gnus-summary-article-unread-p (article)
3561   "Say whether ARTICLE is unread or not."
3562   (memq article gnus-newsgroup-unreads))
3563
3564 (defun gnus-summary-first-article-p (&optional article)
3565   "Return whether ARTICLE is the first article in the buffer."
3566   (if (not (setq article (or article (gnus-summary-article-number))))
3567       nil
3568     (eq article (caar gnus-newsgroup-data))))
3569
3570 (defun gnus-summary-last-article-p (&optional article)
3571   "Return whether ARTICLE is the last article in the buffer."
3572   (if (not (setq article (or article (gnus-summary-article-number))))
3573       ;; All non-existent numbers are the last article.  :-)
3574       t
3575     (not (cdr (gnus-data-find-list article)))))
3576
3577 (defun gnus-make-thread-indent-array (&optional n)
3578   (when (or n
3579             (progn (setq n 200) nil)
3580             (null gnus-thread-indent-array)
3581             (/= gnus-thread-indent-level gnus-thread-indent-array-level))
3582     (setq gnus-thread-indent-array (make-vector (1+ n) "")
3583           gnus-thread-indent-array-level gnus-thread-indent-level)
3584     (while (>= n 0)
3585       (aset gnus-thread-indent-array n
3586             (make-string (* n gnus-thread-indent-level) ? ))
3587       (setq n (1- n)))))
3588
3589 (defun gnus-update-summary-mark-positions ()
3590   "Compute where the summary marks are to go."
3591   (save-excursion
3592     (when (gnus-buffer-exists-p gnus-summary-buffer)
3593       (set-buffer gnus-summary-buffer))
3594     (let ((spec gnus-summary-line-format-spec)
3595           pos)
3596       (save-excursion
3597         (gnus-set-work-buffer)
3598         (let ((gnus-tmp-unread ?Z)
3599               (gnus-replied-mark ?Z)
3600               (gnus-score-below-mark ?Z)
3601               (gnus-score-over-mark ?Z)
3602               (gnus-undownloaded-mark ?Z)
3603               (gnus-summary-line-format-spec spec)
3604               (gnus-newsgroup-downloadable '(0))
3605               (header [0 "" "" "05 Apr 2001 23:33:09 +0400" "" "" 0 0 "" nil])
3606               case-fold-search ignores)
3607           ;; Here, all marks are bound to Z.
3608           (gnus-summary-insert-line header
3609                                     0 nil t gnus-tmp-unread t nil "" nil 1)
3610           (goto-char (point-min))
3611           ;; Memorize the positions of the same characters as dummy marks.
3612           (while (re-search-forward "[A-D]" nil t)
3613             (push (point) ignores))
3614           (erase-buffer)
3615           ;; We use A-D as dummy marks in order to know column positions
3616           ;; where marks should be inserted.
3617           (setq gnus-tmp-unread ?A
3618                 gnus-replied-mark ?B
3619                 gnus-score-below-mark ?C
3620                 gnus-score-over-mark ?C
3621                 gnus-undownloaded-mark ?D)
3622           (gnus-summary-insert-line header
3623                                     0 nil t gnus-tmp-unread t nil "" nil 1)
3624           ;; Ignore characters which aren't dummy marks.
3625           (dolist (p ignores)
3626             (delete-region (goto-char (1- p)) p)
3627             (insert ?Z))
3628           (goto-char (point-min))
3629           (setq pos (list (cons 'unread
3630                                 (and (search-forward "A" nil t)
3631                                      (- (point) (point-min) 1)))))
3632           (goto-char (point-min))
3633           (push (cons 'replied (and (search-forward "B" nil t)
3634                                     (- (point) (point-min) 1)))
3635                 pos)
3636           (goto-char (point-min))
3637           (push (cons 'score (and (search-forward "C" nil t)
3638                                   (- (point) (point-min) 1)))
3639                 pos)
3640           (goto-char (point-min))
3641           (push (cons 'download (and (search-forward "D" nil t)
3642                                      (- (point) (point-min) 1)))
3643                 pos)))
3644       (setq gnus-summary-mark-positions pos))))
3645
3646 (defun gnus-summary-insert-dummy-line (gnus-tmp-subject gnus-tmp-number)
3647   "Insert a dummy root in the summary buffer."
3648   (beginning-of-line)
3649   (gnus-add-text-properties
3650    (point) (progn (eval gnus-summary-dummy-line-format-spec) (point))
3651    (list 'gnus-number gnus-tmp-number 'gnus-intangible gnus-tmp-number)))
3652
3653 (defun gnus-summary-extract-address-component (from)
3654   (or (car (funcall gnus-extract-address-components from))
3655       from))
3656
3657 (defun gnus-summary-from-or-to-or-newsgroups (header gnus-tmp-from)
3658   (let ((mail-parse-charset gnus-newsgroup-charset)
3659         (ignored-from-addresses (gnus-ignored-from-addresses))
3660         ; Is it really necessary to do this next part for each summary line?
3661         ; Luckily, doesn't seem to slow things down much.
3662         (mail-parse-ignored-charsets
3663          (with-current-buffer gnus-summary-buffer
3664            gnus-newsgroup-ignored-charsets)))
3665     (or
3666      (and ignored-from-addresses
3667           (string-match ignored-from-addresses gnus-tmp-from)
3668           (let ((extra-headers (mail-header-extra header))
3669                 to
3670                 newsgroups)
3671             (cond
3672              ((setq to (cdr (assq 'To extra-headers)))
3673               (concat gnus-summary-to-prefix
3674                       (inline
3675                         (gnus-summary-extract-address-component
3676                          (funcall gnus-decode-encoded-address-function to)))))
3677              ((setq newsgroups
3678                     (or
3679                      (cdr (assq 'Newsgroups extra-headers))
3680                      (and
3681                       (memq 'Newsgroups gnus-extra-headers)
3682                       (eq (car (gnus-find-method-for-group
3683                                 gnus-newsgroup-name)) 'nntp)
3684                       (gnus-group-real-name gnus-newsgroup-name))))
3685               (concat gnus-summary-newsgroup-prefix newsgroups)))))
3686      (inline (gnus-summary-extract-address-component gnus-tmp-from)))))
3687
3688 (defun gnus-summary-insert-line (gnus-tmp-header
3689                                  gnus-tmp-level gnus-tmp-current
3690                                  undownloaded gnus-tmp-unread gnus-tmp-replied
3691                                  gnus-tmp-expirable gnus-tmp-subject-or-nil
3692                                  &optional gnus-tmp-dummy gnus-tmp-score
3693                                  gnus-tmp-process)
3694   (if (>= gnus-tmp-level (length gnus-thread-indent-array))
3695       (gnus-make-thread-indent-array (max (* 2 (length gnus-thread-indent-array))
3696                                           gnus-tmp-level)))
3697   (let* ((gnus-tmp-indentation (aref gnus-thread-indent-array gnus-tmp-level))
3698          (gnus-tmp-lines (mail-header-lines gnus-tmp-header))
3699          (gnus-tmp-score (or gnus-tmp-score gnus-summary-default-score 0))
3700          (gnus-tmp-score-char
3701           (if (or (null gnus-summary-default-score)
3702                   (<= (abs (- gnus-tmp-score gnus-summary-default-score))
3703                       gnus-summary-zcore-fuzz))
3704               ?                         ;Whitespace
3705             (if (< gnus-tmp-score gnus-summary-default-score)
3706                 gnus-score-below-mark gnus-score-over-mark)))
3707          (gnus-tmp-number (mail-header-number gnus-tmp-header))
3708          (gnus-tmp-replied
3709           (cond (gnus-tmp-process gnus-process-mark)
3710                 ((memq gnus-tmp-current gnus-newsgroup-cached)
3711                  gnus-cached-mark)
3712                 (gnus-tmp-replied gnus-replied-mark)
3713                 ((memq gnus-tmp-current gnus-newsgroup-forwarded)
3714                  gnus-forwarded-mark)
3715                 ((memq gnus-tmp-current gnus-newsgroup-saved)
3716                  gnus-saved-mark)
3717                 ((memq gnus-tmp-number gnus-newsgroup-recent)
3718                  gnus-recent-mark)
3719                 ((memq gnus-tmp-number gnus-newsgroup-unseen)
3720                  gnus-unseen-mark)
3721                 (t gnus-no-mark)))
3722          (gnus-tmp-downloaded
3723           (cond (undownloaded
3724                  gnus-undownloaded-mark)
3725                 (gnus-newsgroup-agentized
3726                  gnus-downloaded-mark)
3727                 (t
3728                  gnus-no-mark)))
3729          (gnus-tmp-from (mail-header-from gnus-tmp-header))
3730          (gnus-tmp-name
3731           (cond
3732            ((string-match "<[^>]+> *$" gnus-tmp-from)
3733             (let ((beg (match-beginning 0)))
3734               (or (and (string-match "^\".+\"" gnus-tmp-from)
3735                        (substring gnus-tmp-from 1 (1- (match-end 0))))
3736                   (substring gnus-tmp-from 0 beg))))
3737            ((string-match "(.+)" gnus-tmp-from)
3738             (substring gnus-tmp-from
3739                        (1+ (match-beginning 0)) (1- (match-end 0))))
3740            (t gnus-tmp-from)))
3741          (gnus-tmp-subject (mail-header-subject gnus-tmp-header))
3742          (gnus-tmp-opening-bracket (if gnus-tmp-dummy ?\< ?\[))
3743          (gnus-tmp-closing-bracket (if gnus-tmp-dummy ?\> ?\]))
3744          (inhibit-read-only t))
3745     (when (string= gnus-tmp-name "")
3746       (setq gnus-tmp-name gnus-tmp-from))
3747     (unless (numberp gnus-tmp-lines)
3748       (setq gnus-tmp-lines -1))
3749     (if (= gnus-tmp-lines -1)
3750         (setq gnus-tmp-lines "?")
3751       (setq gnus-tmp-lines (number-to-string gnus-tmp-lines)))
3752     (condition-case ()
3753         (gnus-put-text-property
3754          (point)
3755          (progn (eval gnus-summary-line-format-spec) (point))
3756          'gnus-number gnus-tmp-number)
3757       (error (gnus-message 5 "Error updating the summary line")))
3758     (when (gnus-visual-p 'summary-highlight 'highlight)
3759       (forward-line -1)
3760       (gnus-summary-highlight-line)
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-summary-highlight-line)
3794         (gnus-run-hooks 'gnus-summary-update-hook)))))
3795
3796 (defvar gnus-tmp-new-adopts nil)
3797
3798 (defun gnus-summary-number-of-articles-in-thread (thread &optional level char)
3799   "Return the number of articles in THREAD.
3800 This may be 0 in some cases -- if none of the articles in
3801 the thread are to be displayed."
3802   (let* ((number
3803          ;; Fix by Luc Van Eycken <Luc.VanEycken@esat.kuleuven.ac.be>.
3804           (cond
3805            ((not (listp thread))
3806             1)
3807            ((and (consp thread) (cdr thread))
3808             (apply
3809              '+ 1 (mapcar
3810                    'gnus-summary-number-of-articles-in-thread (cdr thread))))
3811            ((null thread)
3812             1)
3813            ((memq (mail-header-number (car thread)) gnus-newsgroup-limit)
3814             1)
3815            (t 0))))
3816     (when (and level (zerop level) gnus-tmp-new-adopts)
3817       (incf number
3818             (apply '+ (mapcar
3819                        'gnus-summary-number-of-articles-in-thread
3820                        gnus-tmp-new-adopts))))
3821     (if char
3822         (if (> number 1) gnus-not-empty-thread-mark
3823           gnus-empty-thread-mark)
3824       number)))
3825
3826 (defsubst gnus-summary-line-message-size (head)
3827   "Return pretty-printed version of message size.
3828 This function is intended to be used in
3829 `gnus-summary-line-format-alist'."
3830   (let ((c (or (mail-header-chars head) -1)))
3831     (cond ((< c 0) "n/a")               ; chars not available
3832           ((< c (* 1000 10)) (format "%1.1fk" (/ c 1024.0)))
3833           ((< c (* 1000 100)) (format "%dk" (/ c 1024.0)))
3834           ((< c (* 1000 10000)) (format "%1.1fM" (/ c (* 1024.0 1024))))
3835           (t (format "%dM" (/ c (* 1024.0 1024)))))))
3836
3837
3838 (defun gnus-summary-set-local-parameters (group)
3839   "Go through the local params of GROUP and set all variable specs in that list."
3840   (let ((vars '(quit-config active)))   ; Ignore things that aren't
3841                                         ; really variables.
3842     (dolist (elem (gnus-group-find-parameter group))
3843       (and (consp elem)                 ; Has to be a cons.
3844            (consp (cdr elem))           ; The cdr has to be a list.
3845            (symbolp (car elem))         ; Has to be a symbol in there.
3846            (not (memq (car elem) vars))
3847            (ignore-errors
3848              (push (car elem) vars)
3849              ;; Variables like `gnus-show-threads' that are globally
3850              ;; bound, if used as group parameters, need to get to be
3851              ;; buffer-local, whereas just parameters like `gcc-self',
3852              ;; `timestamp', etc. should not be bound as variables.
3853              (if (boundp (car elem))
3854                  (set (make-local-variable (car elem)) (eval (nth 1 elem)))
3855                (eval (nth 1 elem))))))))
3856
3857 (defun gnus-summary-read-group (group &optional show-all no-article
3858                                       kill-buffer no-display backward
3859                                       select-articles)
3860   "Start reading news in newsgroup GROUP.
3861 If SHOW-ALL is non-nil, already read articles are also listed.
3862 If NO-ARTICLE is non-nil, no article is selected initially.
3863 If NO-DISPLAY, don't generate a summary buffer."
3864   (let (result)
3865     (while (and group
3866                 (null (setq result
3867                             (let ((gnus-auto-select-next nil))
3868                               (or (gnus-summary-read-group-1
3869                                    group show-all no-article
3870                                    kill-buffer no-display
3871                                    select-articles)
3872                                   (setq show-all nil
3873                                         select-articles nil)))))
3874                 (eq gnus-auto-select-next 'quietly))
3875       (set-buffer gnus-group-buffer)
3876       ;; The entry function called above goes to the next
3877       ;; group automatically, so we go two groups back
3878       ;; if we are searching for the previous group.
3879       (when backward
3880         (gnus-group-prev-unread-group 2))
3881       (if (not (equal group (gnus-group-group-name)))
3882           (setq group (gnus-group-group-name))
3883         (setq group nil)))
3884     result))
3885
3886 (defun gnus-summary-read-group-1 (group show-all no-article
3887                                         kill-buffer no-display
3888                                         &optional select-articles)
3889   ;; Killed foreign groups can't be entered.
3890   ;;  (when (and (not (gnus-group-native-p group))
3891   ;;         (not (gnus-gethash group gnus-newsrc-hashtb)))
3892   ;;    (error "Dead non-native groups can't be entered"))
3893   (gnus-message 5 "Retrieving newsgroup: %s..."
3894                 (gnus-group-decoded-name group))
3895   (let* ((new-group (gnus-summary-setup-buffer group))
3896          (quit-config (gnus-group-quit-config group))
3897          (did-select (and new-group (gnus-select-newsgroup
3898                                      group show-all select-articles))))
3899     (cond
3900      ;; This summary buffer exists already, so we just select it.
3901      ((not new-group)
3902       (gnus-set-global-variables)
3903       (when kill-buffer
3904         (gnus-kill-or-deaden-summary kill-buffer))
3905       (gnus-configure-windows 'summary 'force)
3906       (gnus-set-mode-line 'summary)
3907       (gnus-summary-position-point)
3908       (message "")
3909       t)
3910      ;; We couldn't select this group.
3911      ((null did-select)
3912       (when (and (eq major-mode 'gnus-summary-mode)
3913                  (not (equal (current-buffer) kill-buffer)))
3914         (kill-buffer (current-buffer))
3915         (if (not quit-config)
3916             (progn
3917               ;; Update the info -- marks might need to be removed,
3918               ;; for instance.
3919               (gnus-summary-update-info)
3920               (set-buffer gnus-group-buffer)
3921               (gnus-group-jump-to-group group)
3922               (gnus-group-next-unread-group 1))
3923           (gnus-handle-ephemeral-exit quit-config)))
3924       (let ((grpinfo (gnus-get-info group)))
3925         (if (null (gnus-info-read grpinfo))
3926             (gnus-message 3 "Group %s contains no messages"
3927                           (gnus-group-decoded-name group))
3928           (gnus-message 3 "Can't select group")))
3929       nil)
3930      ;; The user did a `C-g' while prompting for number of articles,
3931      ;; so we exit this group.
3932      ((eq did-select 'quit)
3933       (and (eq major-mode 'gnus-summary-mode)
3934            (not (equal (current-buffer) kill-buffer))
3935            (kill-buffer (current-buffer)))
3936       (when kill-buffer
3937         (gnus-kill-or-deaden-summary kill-buffer))
3938       (if (not quit-config)
3939           (progn
3940             (set-buffer gnus-group-buffer)
3941             (gnus-group-jump-to-group group)
3942             (gnus-configure-windows 'group 'force))
3943         (gnus-handle-ephemeral-exit quit-config))
3944       ;; Finally signal the quit.
3945       (signal 'quit nil))
3946      ;; The group was successfully selected.
3947      (t
3948       (gnus-set-global-variables)
3949       ;; Save the active value in effect when the group was entered.
3950       (setq gnus-newsgroup-active
3951             (gnus-copy-sequence
3952              (gnus-active gnus-newsgroup-name)))
3953       (setq gnus-newsgroup-highest (cdr gnus-newsgroup-active))
3954       ;; You can change the summary buffer in some way with this hook.
3955       (gnus-run-hooks 'gnus-select-group-hook)
3956       (when (memq 'summary (gnus-update-format-specifications
3957                             nil 'summary 'summary-mode 'summary-dummy))
3958         ;; The format specification for the summary line was updated,
3959         ;; so we need to update the mark positions as well.
3960         (gnus-update-summary-mark-positions))
3961       ;; Do score processing.
3962       (when gnus-use-scoring
3963         (gnus-possibly-score-headers))
3964       ;; Check whether to fill in the gaps in the threads.
3965       (when gnus-build-sparse-threads
3966         (gnus-build-sparse-threads))
3967       ;; Find the initial limit.
3968       (if show-all
3969           (let ((gnus-newsgroup-dormant nil))
3970             (gnus-summary-initial-limit show-all))
3971         (gnus-summary-initial-limit show-all))
3972       ;; Generate the summary buffer.
3973       (unless no-display
3974         (gnus-summary-prepare))
3975       (when gnus-use-trees
3976         (gnus-tree-open group)
3977         (setq gnus-summary-highlight-line-function
3978               'gnus-tree-highlight-article))
3979       ;; If the summary buffer is empty, but there are some low-scored
3980       ;; articles or some excluded dormants, we include these in the
3981       ;; buffer.
3982       (when (and (zerop (buffer-size))
3983                  (not no-display))
3984         (cond (gnus-newsgroup-dormant
3985                (gnus-summary-limit-include-dormant))
3986               ((and gnus-newsgroup-scored show-all)
3987                (gnus-summary-limit-include-expunged t))))
3988       ;; Function `gnus-apply-kill-file' must be called in this hook.
3989       (gnus-run-hooks 'gnus-apply-kill-hook)
3990       (if (and (zerop (buffer-size))
3991                (not no-display))
3992           (progn
3993             ;; This newsgroup is empty.
3994             (gnus-summary-catchup-and-exit nil t)
3995             (gnus-message 6 "No unread news")
3996             (when kill-buffer
3997               (gnus-kill-or-deaden-summary kill-buffer))
3998             ;; Return nil from this function.
3999             nil)
4000         ;; Hide conversation thread subtrees.  We cannot do this in
4001         ;; gnus-summary-prepare-hook since kill processing may not
4002         ;; work with hidden articles.
4003         (gnus-summary-maybe-hide-threads)
4004         (when kill-buffer
4005           (gnus-kill-or-deaden-summary kill-buffer))
4006         (gnus-summary-auto-select-subject)
4007         ;; Show first unread article if requested.
4008         (if (and (not no-article)
4009                  (not no-display)
4010                  gnus-newsgroup-unreads
4011                  gnus-auto-select-first)
4012             (progn
4013               (gnus-configure-windows 'summary)
4014               (let ((art (gnus-summary-article-number)))
4015                 (unless (and (not gnus-plugged)
4016                              (or (memq art gnus-newsgroup-undownloaded)
4017                                  (memq art gnus-newsgroup-downloadable)))
4018                   (gnus-summary-goto-article art))))
4019           ;; Don't select any articles.
4020           (gnus-summary-position-point)
4021           (gnus-configure-windows 'summary 'force)
4022           (gnus-set-mode-line 'summary))
4023         (when (and gnus-auto-center-group
4024                    (get-buffer-window gnus-group-buffer t))
4025           ;; Gotta use windows, because recenter does weird stuff if
4026           ;; the current buffer ain't the displayed window.
4027           (let ((owin (selected-window)))
4028             (select-window (get-buffer-window gnus-group-buffer t))
4029             (when (gnus-group-goto-group group)
4030               (recenter))
4031             (select-window owin)))
4032         ;; Mark this buffer as "prepared".
4033         (setq gnus-newsgroup-prepared t)
4034         (gnus-run-hooks 'gnus-summary-prepared-hook)
4035         (unless (gnus-ephemeral-group-p group)
4036           (gnus-group-update-group group))
4037         t)))))
4038
4039 (defun gnus-summary-auto-select-subject ()
4040   "Select the subject line on initial group entry."
4041   (goto-char (point-min))
4042   (cond
4043    ((eq gnus-auto-select-subject 'best)
4044     (gnus-summary-best-unread-subject))
4045    ((eq gnus-auto-select-subject 'unread)
4046     (gnus-summary-first-unread-subject))
4047    ((eq gnus-auto-select-subject 'unseen)
4048     (gnus-summary-first-unseen-subject))
4049    ((eq gnus-auto-select-subject 'unseen-or-unread)
4050     (gnus-summary-first-unseen-or-unread-subject))
4051    ((eq gnus-auto-select-subject 'first)
4052     ;; Do nothing.
4053     )
4054    ((functionp gnus-auto-select-subject)
4055     (funcall gnus-auto-select-subject))))
4056
4057 (defun gnus-summary-prepare ()
4058   "Generate the summary buffer."
4059   (interactive)
4060   (let ((inhibit-read-only t))
4061     (erase-buffer)
4062     (setq gnus-newsgroup-data nil
4063           gnus-newsgroup-data-reverse nil)
4064     (gnus-run-hooks 'gnus-summary-generate-hook)
4065     ;; Generate the buffer, either with threads or without.
4066     (when gnus-newsgroup-headers
4067       (gnus-summary-prepare-threads
4068        (if gnus-show-threads
4069            (gnus-sort-gathered-threads
4070             (funcall gnus-summary-thread-gathering-function
4071                      (gnus-sort-threads
4072                       (gnus-cut-threads (gnus-make-threads)))))
4073          ;; Unthreaded display.
4074          (gnus-sort-articles gnus-newsgroup-headers))))
4075     (setq gnus-newsgroup-data (nreverse gnus-newsgroup-data))
4076     ;; Call hooks for modifying summary buffer.
4077     (goto-char (point-min))
4078     (gnus-run-hooks 'gnus-summary-prepare-hook)))
4079
4080 (defsubst gnus-general-simplify-subject (subject)
4081   "Simplify subject by the same rules as `gnus-gather-threads-by-subject'."
4082   (setq subject
4083         (cond
4084          ;; Truncate the subject.
4085          (gnus-simplify-subject-functions
4086           (gnus-map-function gnus-simplify-subject-functions subject))
4087          ((numberp gnus-summary-gather-subject-limit)
4088           (setq subject (gnus-simplify-subject-re subject))
4089           (if (> (length subject) gnus-summary-gather-subject-limit)
4090               (substring subject 0 gnus-summary-gather-subject-limit)
4091             subject))
4092          ;; Fuzzily simplify it.
4093          ((eq 'fuzzy gnus-summary-gather-subject-limit)
4094           (gnus-simplify-subject-fuzzy subject))
4095          ;; Just remove the leading "Re:".
4096          (t
4097           (gnus-simplify-subject-re subject))))
4098
4099   (if (and gnus-summary-gather-exclude-subject
4100            (string-match gnus-summary-gather-exclude-subject subject))
4101       nil                         ; This article shouldn't be gathered
4102     subject))
4103
4104 (defun gnus-summary-simplify-subject-query ()
4105   "Query where the respool algorithm would put this article."
4106   (interactive)
4107   (gnus-summary-select-article)
4108   (message "%s" (gnus-general-simplify-subject (gnus-summary-article-subject))))
4109
4110 (defun gnus-gather-threads-by-subject (threads)
4111   "Gather threads by looking at Subject headers."
4112   (if (not gnus-summary-make-false-root)
4113       threads
4114     (let ((hashtb (gnus-make-hashtable 1024))
4115           (prev threads)
4116           (result threads)
4117           subject hthread whole-subject)
4118       (while threads
4119         (setq subject (gnus-general-simplify-subject
4120                        (setq whole-subject (mail-header-subject
4121                                             (caar threads)))))
4122         (when subject
4123           (if (setq hthread (gnus-gethash subject hashtb))
4124               (progn
4125                 ;; We enter a dummy root into the thread, if we
4126                 ;; haven't done that already.
4127                 (unless (stringp (caar hthread))
4128                   (setcar hthread (list whole-subject (car hthread))))
4129                 ;; We add this new gathered thread to this gathered
4130                 ;; thread.
4131                 (setcdr (car hthread)
4132                         (nconc (cdar hthread) (list (car threads))))
4133                 ;; Remove it from the list of threads.
4134                 (setcdr prev (cdr threads))
4135                 (setq threads prev))
4136             ;; Enter this thread into the hash table.
4137             (gnus-sethash subject
4138                           (if gnus-summary-make-false-root-always
4139                               (progn
4140                                 ;; If you want a dummy root above all
4141                                 ;; threads...
4142                                 (setcar threads (list whole-subject
4143                                                       (car threads)))
4144                                 threads)
4145                             threads)
4146                           hashtb)))
4147         (setq prev threads)
4148         (setq threads (cdr threads)))
4149       result)))
4150
4151 (defun gnus-gather-threads-by-references (threads)
4152   "Gather threads by looking at References headers."
4153   (let ((idhashtb (gnus-make-hashtable 1024))
4154         (thhashtb (gnus-make-hashtable 1024))
4155         (prev threads)
4156         (result threads)
4157         ids references id gthread gid entered ref)
4158     (while threads
4159       (when (setq references (mail-header-references (caar threads)))
4160         (setq id (mail-header-id (caar threads))
4161               ids (inline (gnus-split-references references))
4162               entered nil)
4163         (while (setq ref (pop ids))
4164           (setq ids (delete ref ids))
4165           (if (not (setq gid (gnus-gethash ref idhashtb)))
4166               (progn
4167                 (gnus-sethash ref id idhashtb)
4168                 (gnus-sethash id threads thhashtb))
4169             (setq gthread (gnus-gethash gid thhashtb))
4170             (unless entered
4171               ;; We enter a dummy root into the thread, if we
4172               ;; haven't done that already.
4173               (unless (stringp (caar gthread))
4174                 (setcar gthread (list (mail-header-subject (caar gthread))
4175                                       (car gthread))))
4176               ;; We add this new gathered thread to this gathered
4177               ;; thread.
4178               (setcdr (car gthread)
4179                       (nconc (cdar gthread) (list (car threads)))))
4180             ;; Add it into the thread hash table.
4181             (gnus-sethash id gthread thhashtb)
4182             (setq entered t)
4183             ;; Remove it from the list of threads.
4184             (setcdr prev (cdr threads))
4185             (setq threads prev))))
4186       (setq prev threads)
4187       (setq threads (cdr threads)))
4188     result))
4189
4190 (defun gnus-sort-gathered-threads (threads)
4191   "Sort subtreads inside each gathered thread by `gnus-sort-gathered-threads-function'."
4192   (let ((result threads))
4193     (while threads
4194       (when (stringp (caar threads))
4195         (setcdr (car threads)
4196                 (sort (cdar threads) gnus-sort-gathered-threads-function)))
4197       (setq threads (cdr threads)))
4198     result))
4199
4200 (defun gnus-thread-loop-p (root thread)
4201   "Say whether ROOT is in THREAD."
4202   (let ((stack (list thread))
4203         (infloop 0)
4204         th)
4205     (while (setq thread (pop stack))
4206       (setq th (cdr thread))
4207       (while (and th
4208                   (not (eq (caar th) root)))
4209         (pop th))
4210       (if th
4211           ;; We have found a loop.
4212           (let (ref-dep)
4213             (setcdr thread (delq (car th) (cdr thread)))
4214             (if (boundp (setq ref-dep (intern "none"
4215                                               gnus-newsgroup-dependencies)))
4216                 (setcdr (symbol-value ref-dep)
4217                         (nconc (cdr (symbol-value ref-dep))
4218                                (list (car th))))
4219               (set ref-dep (list nil (car th))))
4220             (setq infloop 1
4221                   stack nil))
4222         ;; Push all the subthreads onto the stack.
4223         (push (cdr thread) stack)))
4224     infloop))
4225
4226 (defun gnus-make-threads ()
4227   "Go through the dependency hashtb and find the roots.  Return all threads."
4228   (let (threads)
4229     (while (catch 'infloop
4230              (mapatoms
4231               (lambda (refs)
4232                 ;; Deal with self-referencing References loops.
4233                 (when (and (car (symbol-value refs))
4234                            (not (zerop
4235                                  (apply
4236                                   '+
4237                                   (mapcar
4238                                    (lambda (thread)
4239                                      (gnus-thread-loop-p
4240                                       (car (symbol-value refs)) thread))
4241                                    (cdr (symbol-value refs)))))))
4242                   (setq threads nil)
4243                   (throw 'infloop t))
4244                 (unless (car (symbol-value refs))
4245                   ;; These threads do not refer back to any other
4246                   ;; articles, so they're roots.
4247                   (setq threads (append (cdr (symbol-value refs)) threads))))
4248               gnus-newsgroup-dependencies)))
4249     threads))
4250
4251 ;; Build the thread tree.
4252 (defsubst gnus-dependencies-add-header (header dependencies force-new)
4253   "Enter HEADER into the DEPENDENCIES table if it is not already there.
4254
4255 If FORCE-NEW is not nil, enter HEADER into the DEPENDENCIES table even
4256 if it was already present.
4257
4258 If `gnus-summary-ignore-duplicates' is nil then duplicate Message-IDs
4259 will not be entered in the DEPENDENCIES table.  Otherwise duplicate
4260 Message-IDs will be renamed to a unique Message-ID before being
4261 entered.
4262
4263 Returns HEADER if it was entered in the DEPENDENCIES.  Returns nil otherwise."
4264   (let* ((id (mail-header-id header))
4265          (id-dep (and id (intern id dependencies)))
4266          parent-id ref ref-dep ref-header replaced)
4267     ;; Enter this `header' in the `dependencies' table.
4268     (cond
4269      ((not id-dep)
4270       (setq header nil))
4271      ;; The first two cases do the normal part: enter a new `header'
4272      ;; in the `dependencies' table.
4273      ((not (boundp id-dep))
4274       (set id-dep (list header)))
4275      ((null (car (symbol-value id-dep)))
4276       (setcar (symbol-value id-dep) header))
4277
4278      ;; From here the `header' was already present in the
4279      ;; `dependencies' table.
4280      (force-new
4281       ;; Overrides an existing entry;
4282       ;; just set the header part of the entry.
4283       (setcar (symbol-value id-dep) header)
4284       (setq replaced t))
4285
4286      ;; Renames the existing `header' to a unique Message-ID.
4287      ((not gnus-summary-ignore-duplicates)
4288       ;; An article with this Message-ID has already been seen.
4289       ;; We rename the Message-ID.
4290       (set (setq id-dep (intern (setq id (nnmail-message-id)) dependencies))
4291            (list header))
4292       (mail-header-set-id header id))
4293
4294      ;; The last case ignores an existing entry, except it adds any
4295      ;; additional Xrefs (in case the two articles came from different
4296      ;; servers.
4297      ;; Also sets `header' to `nil' meaning that the `dependencies'
4298      ;; table was *not* modified.
4299      (t
4300       (mail-header-set-xref
4301        (car (symbol-value id-dep))
4302        (concat (or (mail-header-xref (car (symbol-value id-dep)))
4303                    "")
4304                (or (mail-header-xref header) "")))
4305       (setq header nil)))
4306
4307     (when (and header (not replaced))
4308       ;; First check that we are not creating a References loop.
4309       (setq parent-id (gnus-parent-id (mail-header-references header)))
4310       (setq ref parent-id)
4311       (while (and ref
4312                   (setq ref-dep (intern-soft ref dependencies))
4313                   (boundp ref-dep)
4314                   (setq ref-header (car (symbol-value ref-dep))))
4315         (if (string= id ref)
4316             ;; Yuk!  This is a reference loop.  Make the article be a
4317             ;; root article.
4318             (progn
4319               (mail-header-set-references (car (symbol-value id-dep)) "none")
4320               (setq ref nil)
4321               (setq parent-id nil))
4322           (setq ref (gnus-parent-id (mail-header-references ref-header)))))
4323       (setq ref-dep (intern (or parent-id "none") dependencies))
4324       (if (boundp ref-dep)
4325           (setcdr (symbol-value ref-dep)
4326                   (nconc (cdr (symbol-value ref-dep))
4327                          (list (symbol-value id-dep))))
4328         (set ref-dep (list nil (symbol-value id-dep)))))
4329     header))
4330
4331 (defun gnus-extract-message-id-from-in-reply-to (string)
4332   (if (string-match "<[^>]+>" string)
4333       (substring string (match-beginning 0) (match-end 0))
4334     nil))
4335
4336 (defun gnus-build-sparse-threads ()
4337   (let ((headers gnus-newsgroup-headers)
4338         (mail-parse-charset gnus-newsgroup-charset)
4339         (gnus-summary-ignore-duplicates t)
4340         header references generation relations
4341         subject child end new-child date)
4342     ;; First we create an alist of generations/relations, where
4343     ;; generations is how much we trust the relation, and the relation
4344     ;; is parent/child.
4345     (gnus-message 7 "Making sparse threads...")
4346     (save-excursion
4347       (nnheader-set-temp-buffer " *gnus sparse threads*")
4348       (while (setq header (pop headers))
4349         (when (and (setq references (mail-header-references header))
4350                    (not (string= references "")))
4351           (insert references)
4352           (setq child (mail-header-id header)
4353                 subject (mail-header-subject header)
4354                 date (mail-header-date header)
4355                 generation 0)
4356           (while (search-backward ">" nil t)
4357             (setq end (1+ (point)))
4358             (when (search-backward "<" nil t)
4359               (setq new-child (buffer-substring (point) end))
4360               (push (list (incf generation)
4361                           child (setq child new-child)
4362                           subject date)
4363                     relations)))
4364           (when child
4365             (push (list (1+ generation) child nil subject) relations))
4366           (erase-buffer)))
4367       (kill-buffer (current-buffer)))
4368     ;; Sort over trustworthiness.
4369     (dolist (relation (sort relations 'car-less-than-car))
4370       (when (gnus-dependencies-add-header
4371              (make-full-mail-header
4372               gnus-reffed-article-number
4373               (nth 3 relation) "" (or (nth 4 relation) "")
4374               (nth 1 relation)
4375               (or (nth 2 relation) "") 0 0 "")
4376              gnus-newsgroup-dependencies nil)
4377         (push gnus-reffed-article-number gnus-newsgroup-limit)
4378         (push gnus-reffed-article-number gnus-newsgroup-sparse)
4379         (push (cons gnus-reffed-article-number gnus-sparse-mark)
4380               gnus-newsgroup-reads)
4381         (decf gnus-reffed-article-number)))
4382     (gnus-message 7 "Making sparse threads...done")))
4383
4384 (defun gnus-build-old-threads ()
4385   ;; Look at all the articles that refer back to old articles, and
4386   ;; fetch the headers for the articles that aren't there.  This will
4387   ;; build complete threads - if the roots haven't been expired by the
4388   ;; server, that is.
4389   (let ((mail-parse-charset gnus-newsgroup-charset)
4390         id heads)
4391     (mapatoms
4392      (lambda (refs)
4393        (when (not (car (symbol-value refs)))
4394          (setq heads (cdr (symbol-value refs)))
4395          (while heads
4396            (if (memq (mail-header-number (caar heads))
4397                      gnus-newsgroup-dormant)
4398                (setq heads (cdr heads))
4399              (setq id (symbol-name refs))
4400              (while (and (setq id (gnus-build-get-header id))
4401                          (not (car (gnus-id-to-thread id)))))
4402              (setq heads nil)))))
4403      gnus-newsgroup-dependencies)))
4404
4405 (defsubst gnus-remove-odd-characters (string)
4406   "Translate STRING into something that doesn't contain weird characters."
4407   (mm-subst-char-in-string
4408    ?\r ?\-
4409    (mm-subst-char-in-string ?\n ?\- string t) t))
4410
4411 ;; This function has to be called with point after the article number
4412 ;; on the beginning of the line.
4413 (defsubst gnus-nov-parse-line (number dependencies &optional force-new)
4414   (let ((eol (point-at-eol))
4415         (buffer (current-buffer))
4416         header references in-reply-to)
4417
4418     ;; overview: [num subject from date id refs chars lines misc]
4419     (unwind-protect
4420         (let (x)
4421           (narrow-to-region (point) eol)
4422           (unless (eobp)
4423             (forward-char))
4424
4425           (setq header
4426                 (make-full-mail-header
4427                  number                 ; number
4428                  (condition-case ()     ; subject
4429                      (gnus-remove-odd-characters
4430                       (funcall gnus-decode-encoded-word-function
4431                                (setq x (nnheader-nov-field))))
4432                    (error x))
4433                  (condition-case ()     ; from
4434                      (gnus-remove-odd-characters
4435                       (funcall gnus-decode-encoded-address-function
4436                                (setq x (nnheader-nov-field))))
4437                    (error x))
4438                  (nnheader-nov-field)   ; date
4439                  (nnheader-nov-read-message-id number)  ; id
4440                  (setq references (nnheader-nov-field)) ; refs
4441                  (nnheader-nov-read-integer) ; chars
4442                  (nnheader-nov-read-integer) ; lines
4443                  (unless (eobp)
4444                    (if (looking-at "Xref: ")
4445                        (goto-char (match-end 0)))
4446                    (nnheader-nov-field)) ; Xref
4447                  (nnheader-nov-parse-extra)))) ; extra
4448
4449       (widen))
4450
4451     (when (and (string= references "")
4452                (setq in-reply-to (mail-header-extra header))
4453                (setq in-reply-to (cdr (assq 'In-Reply-To in-reply-to))))
4454       (mail-header-set-references
4455        header (gnus-extract-message-id-from-in-reply-to in-reply-to)))
4456
4457     (when gnus-alter-header-function
4458       (funcall gnus-alter-header-function header))
4459     (gnus-dependencies-add-header header dependencies force-new)))
4460
4461 (defun gnus-build-get-header (id)
4462   "Look through the buffer of NOV lines and find the header to ID.
4463 Enter this line into the dependencies hash table, and return
4464 the id of the parent article (if any)."
4465   (let ((deps gnus-newsgroup-dependencies)
4466         found header)
4467     (prog1
4468         (with-current-buffer nntp-server-buffer
4469           (let ((case-fold-search nil))
4470             (goto-char (point-min))
4471             (while (and (not found)
4472                         (search-forward id nil t))
4473               (beginning-of-line)
4474               (setq found (looking-at
4475                            (format "^[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t%s"
4476                                    (regexp-quote id))))
4477               (or found (beginning-of-line 2)))
4478             (when found
4479               (beginning-of-line)
4480               (and
4481                (setq header (gnus-nov-parse-line
4482                              (read (current-buffer)) deps))
4483                (gnus-parent-id (mail-header-references header))))))
4484       (when header
4485         (let ((number (mail-header-number header)))
4486           (push number gnus-newsgroup-limit)
4487           (push header gnus-newsgroup-headers)
4488           (if (memq number gnus-newsgroup-unselected)
4489               (progn
4490                 (setq gnus-newsgroup-unreads
4491                       (gnus-add-to-sorted-list gnus-newsgroup-unreads
4492                                                number))
4493                 (setq gnus-newsgroup-unselected
4494                       (delq number gnus-newsgroup-unselected)))
4495             (push number gnus-newsgroup-ancient)))))))
4496
4497 (defun gnus-build-all-threads ()
4498   "Read all the headers."
4499   (let ((gnus-summary-ignore-duplicates t)
4500         (mail-parse-charset gnus-newsgroup-charset)
4501         (dependencies gnus-newsgroup-dependencies)
4502         header article)
4503     (with-current-buffer nntp-server-buffer
4504       (let ((case-fold-search nil))
4505         (goto-char (point-min))
4506         (while (not (eobp))
4507           (ignore-errors
4508             (setq article (read (current-buffer))
4509                   header (gnus-nov-parse-line article dependencies)))
4510           (when header
4511             (with-current-buffer gnus-summary-buffer
4512               (push header gnus-newsgroup-headers)
4513               (if (memq (setq article (mail-header-number header))
4514                         gnus-newsgroup-unselected)
4515                   (progn
4516                     (setq gnus-newsgroup-unreads
4517                           (gnus-add-to-sorted-list
4518                            gnus-newsgroup-unreads article))
4519                     (setq gnus-newsgroup-unselected
4520                           (delq article gnus-newsgroup-unselected)))
4521                 (push article gnus-newsgroup-ancient)))
4522             (forward-line 1)))))))
4523
4524 (defun gnus-summary-update-article-line (article header)
4525   "Update the line for ARTICLE using HEADER."
4526   (let* ((id (mail-header-id header))
4527          (thread (gnus-id-to-thread id)))
4528     (unless thread
4529       (error "Article in no thread"))
4530     ;; Update the thread.
4531     (setcar thread header)
4532     (gnus-summary-goto-subject article)
4533     (let* ((datal (gnus-data-find-list article))
4534            (data (car datal))
4535            (inhibit-read-only t)
4536            (level (gnus-summary-thread-level)))
4537       (gnus-delete-line)
4538       (let ((inserted (- (point)
4539                          (progn
4540                            (gnus-summary-insert-line
4541                             header level nil
4542                             (memq article gnus-newsgroup-undownloaded)
4543                             (gnus-article-mark article)
4544                             (memq article gnus-newsgroup-replied)
4545                             (memq article gnus-newsgroup-expirable)
4546                             ;; Only insert the Subject string when it's different
4547                             ;; from the previous Subject string.
4548                             (if (and
4549                                  gnus-show-threads
4550                                  (gnus-subject-equal
4551                                   (condition-case ()
4552                                       (mail-header-subject
4553                                        (gnus-data-header
4554                                         (cadr
4555                                          (gnus-data-find-list
4556                                           article
4557                                           (gnus-data-list t)))))
4558                                     ;; Error on the side of excessive subjects.
4559                                     (error ""))
4560                                   (mail-header-subject header)))
4561                                 ""
4562                               (mail-header-subject header))
4563                             nil (cdr (assq article gnus-newsgroup-scored))
4564                             (memq article gnus-newsgroup-processable))
4565                            (point)))))
4566         (when (cdr datal)
4567           (gnus-data-update-list
4568            (cdr datal)
4569            (- (gnus-data-pos data) (gnus-data-pos (cadr datal)) inserted)))))))
4570
4571 (defun gnus-summary-update-article (article &optional iheader)
4572   "Update ARTICLE in the summary buffer."
4573   (set-buffer gnus-summary-buffer)
4574   (let* ((header (gnus-summary-article-header article))
4575          (id (mail-header-id header))
4576          (data (gnus-data-find article))
4577          (thread (gnus-id-to-thread id))
4578          (references (mail-header-references header))
4579          (parent
4580           (gnus-id-to-thread
4581            (or (gnus-parent-id
4582                 (when (and references
4583                            (not (equal "" references)))
4584                   references))
4585                "none")))
4586          (inhibit-read-only t)
4587          (old (car thread)))
4588     (when thread
4589       (unless iheader
4590         (setcar thread nil)
4591         (when parent
4592           (delq thread parent)))
4593       (if (gnus-summary-insert-subject id header)
4594           ;; Set the (possibly) new article number in the data structure.
4595           (gnus-data-set-number data (gnus-id-to-article id))
4596         (setcar thread old)
4597         nil))))
4598
4599 (defun gnus-rebuild-thread (id &optional line)
4600   "Rebuild the thread containing ID.
4601 If LINE, insert the rebuilt thread starting on line LINE."
4602   (let ((inhibit-read-only t)
4603         old-pos current thread data)
4604     (if (not gnus-show-threads)
4605         (setq thread (list (car (gnus-id-to-thread id))))
4606       ;; Get the thread this article is part of.
4607       (setq thread (gnus-remove-thread id)))
4608     (setq old-pos (point-at-bol))
4609     (setq current (save-excursion
4610                     (and (re-search-backward "[\r\n]" nil t)
4611                          (gnus-summary-article-number))))
4612     ;; If this is a gathered thread, we have to go some re-gathering.
4613     (when (stringp (car thread))
4614       (let ((subject (car thread))
4615             roots thr)
4616         (setq thread (cdr thread))
4617         (while thread
4618           (unless (memq (setq thr (gnus-id-to-thread
4619                                    (gnus-root-id
4620                                     (mail-header-id (caar thread)))))
4621                         roots)
4622             (push thr roots))
4623           (setq thread (cdr thread)))
4624         ;; We now have all (unique) roots.
4625         (if (= (length roots) 1)
4626             ;; All the loose roots are now one solid root.
4627             (setq thread (car roots))
4628           (setq thread (cons subject (gnus-sort-threads roots))))))
4629     (let (threads)
4630       ;; We then insert this thread into the summary buffer.
4631       (when line
4632         (goto-char (point-min))
4633         (forward-line (1- line)))
4634       (let (gnus-newsgroup-data gnus-newsgroup-threads)
4635         (if gnus-show-threads
4636             (gnus-summary-prepare-threads (gnus-cut-threads (list thread)))
4637           (gnus-summary-prepare-unthreaded thread))
4638         (setq data (nreverse gnus-newsgroup-data))
4639         (setq threads gnus-newsgroup-threads))
4640       ;; We splice the new data into the data structure.
4641       ;;!!! This is kinda bogus.  We assume that in LINE is non-nil,
4642       ;;!!! then we want to insert at the beginning of the buffer.
4643       ;;!!! That happens to be true with Gnus now, but that may
4644       ;;!!! change in the future.  Perhaps.
4645       (gnus-data-enter-list
4646        (if line nil current) data (- (point) old-pos))
4647       (setq gnus-newsgroup-threads
4648             (nconc threads gnus-newsgroup-threads))
4649       (gnus-data-compute-positions))))
4650
4651 (defun gnus-number-to-header (number)
4652   "Return the header for article NUMBER."
4653   (let ((headers gnus-newsgroup-headers))
4654     (while (and headers
4655                 (not (= number (mail-header-number (car headers)))))
4656       (pop headers))
4657     (when headers
4658       (car headers))))
4659
4660 (defun gnus-parent-headers (in-headers &optional generation)
4661   "Return the headers of the GENERATIONeth parent of HEADERS."
4662   (unless generation
4663     (setq generation 1))
4664   (let ((parent t)
4665         (headers in-headers)
4666         references)
4667     (while (and parent
4668                 (not (zerop generation))
4669                 (setq references (mail-header-references headers)))
4670       (setq headers (if (and references
4671                              (setq parent (gnus-parent-id references)))
4672                         (car (gnus-id-to-thread parent))
4673                       nil))
4674       (decf generation))
4675     (and (not (eq headers in-headers))
4676          headers)))
4677
4678 (defun gnus-id-to-thread (id)
4679   "Return the (sub-)thread where ID appears."
4680   (gnus-gethash id gnus-newsgroup-dependencies))
4681
4682 (defun gnus-id-to-article (id)
4683   "Return the article number of ID."
4684   (let ((thread (gnus-id-to-thread id)))
4685     (when (and thread
4686                (car thread))
4687       (mail-header-number (car thread)))))
4688
4689 (defun gnus-id-to-header (id)
4690   "Return the article headers of ID."
4691   (car (gnus-id-to-thread id)))
4692
4693 (defun gnus-article-displayed-root-p (article)
4694   "Say whether ARTICLE is a root(ish) article."
4695   (let ((level (gnus-summary-thread-level article))
4696         (refs (mail-header-references  (gnus-summary-article-header article)))
4697         particle)
4698     (cond
4699      ((null level) nil)
4700      ((zerop level) t)
4701      ((null refs) t)
4702      ((null (gnus-parent-id refs)) t)
4703      ((and (= 1 level)
4704            (null (setq particle (gnus-id-to-article
4705                                  (gnus-parent-id refs))))
4706            (null (gnus-summary-thread-level particle)))))))
4707
4708 (defun gnus-root-id (id)
4709   "Return the id of the root of the thread where ID appears."
4710   (let (last-id prev)
4711     (while (and id (setq prev (car (gnus-id-to-thread id))))
4712       (setq last-id id
4713             id (gnus-parent-id (mail-header-references prev))))
4714     last-id))
4715
4716 (defun gnus-articles-in-thread (thread)
4717   "Return the list of articles in THREAD."
4718   (cons (mail-header-number (car thread))
4719         (apply 'nconc (mapcar 'gnus-articles-in-thread (cdr thread)))))
4720
4721 (defun gnus-remove-thread (id &optional dont-remove)
4722   "Remove the thread that has ID in it."
4723   (let (headers thread last-id)
4724     ;; First go up in this thread until we find the root.
4725     (setq last-id (gnus-root-id id)
4726           headers (message-flatten-list (gnus-id-to-thread last-id)))
4727     ;; We have now found the real root of this thread.  It might have
4728     ;; been gathered into some loose thread, so we have to search
4729     ;; through the threads to find the thread we wanted.
4730     (let ((threads gnus-newsgroup-threads)
4731           sub)
4732       (while threads
4733         (setq sub (car threads))
4734         (if (stringp (car sub))
4735             ;; This is a gathered thread, so we look at the roots
4736             ;; below it to find whether this article is in this
4737             ;; gathered root.
4738             (progn
4739               (setq sub (cdr sub))
4740               (while sub
4741                 (when (member (caar sub) headers)
4742                   (setq thread (car threads)
4743                         threads nil
4744                         sub nil))
4745                 (setq sub (cdr sub))))
4746           ;; It's an ordinary thread, so we check it.
4747           (when (eq (car sub) (car headers))
4748             (setq thread sub
4749                   threads nil)))
4750         (setq threads (cdr threads)))
4751       ;; If this article is in no thread, then it's a root.
4752       (if thread
4753           (unless dont-remove
4754             (setq gnus-newsgroup-threads (delq thread gnus-newsgroup-threads)))
4755         (setq thread (gnus-id-to-thread last-id)))
4756       (when thread
4757         (prog1
4758             thread                      ; We return this thread.
4759           (unless dont-remove
4760             (if (stringp (car thread))
4761                 (progn
4762                   ;; If we use dummy roots, then we have to remove the
4763                   ;; dummy root as well.
4764                   (when (eq gnus-summary-make-false-root 'dummy)
4765                     ;; We go to the dummy root by going to
4766                     ;; the first sub-"thread", and then one line up.
4767                     (gnus-summary-goto-article
4768                      (mail-header-number (caadr thread)))
4769                     (forward-line -1)
4770                     (gnus-delete-line)
4771                     (gnus-data-compute-positions))
4772                   (setq thread (cdr thread))
4773                   (while thread
4774                     (gnus-remove-thread-1 (car thread))
4775                     (setq thread (cdr thread))))
4776               (gnus-remove-thread-1 thread))))))))
4777
4778 (defun gnus-remove-thread-1 (thread)
4779   "Remove the thread THREAD recursively."
4780   (let ((number (mail-header-number (pop thread)))
4781         d)
4782     (setq thread (reverse thread))
4783     (while thread
4784       (gnus-remove-thread-1 (pop thread)))
4785     (when (setq d (gnus-data-find number))
4786       (goto-char (gnus-data-pos d))
4787       (gnus-summary-show-thread)
4788       (gnus-data-remove
4789        number
4790        (- (point-at-bol)
4791           (prog1
4792               (1+ (point-at-eol))
4793             (gnus-delete-line)))))))
4794
4795 (defun gnus-sort-threads-recursive (threads func)
4796   (sort (mapcar (lambda (thread)
4797                   (cons (car thread)
4798                         (and (cdr thread)
4799                              (gnus-sort-threads-recursive (cdr thread) func))))
4800                 threads) func))
4801
4802 (defun gnus-sort-threads-loop (threads func)
4803   (let* ((superthread (cons nil threads))
4804          (stack (list (cons superthread threads)))
4805          remaining-threads thread)
4806     (while stack
4807       (setq remaining-threads (cdr (car stack)))
4808       (if remaining-threads
4809           (progn (setq thread (car remaining-threads))
4810                  (setcdr (car stack) (cdr remaining-threads))
4811                  (if (cdr thread)
4812                      (push (cons thread (cdr thread)) stack)))
4813         (setq thread (caar stack))
4814         (setcdr thread (sort (cdr thread) func))
4815         (pop stack)))
4816     (cdr superthread)))
4817
4818 (defun gnus-sort-threads (threads)
4819   "Sort THREADS."
4820   (if (not gnus-thread-sort-functions)
4821       threads
4822     (gnus-message 8 "Sorting threads...")
4823     (prog1
4824         (condition-case nil
4825             (let ((max-lisp-eval-depth (max max-lisp-eval-depth 5000)))
4826               (gnus-sort-threads-recursive
4827                threads (gnus-make-sort-function gnus-thread-sort-functions)))
4828           ;; Even after binding max-lisp-eval-depth, the recursive
4829           ;; sorter might fail for very long threads.  In that case,
4830           ;; try using a (less well-tested) non-recursive sorter.
4831           (error (gnus-message 9 "Sorting threads with loop...")
4832                  (gnus-sort-threads-loop
4833                   threads (gnus-make-sort-function
4834                            gnus-thread-sort-functions))))
4835       (gnus-message 8 "Sorting threads...done"))))
4836
4837 (defun gnus-sort-articles (articles)
4838   "Sort ARTICLES."
4839   (when gnus-article-sort-functions
4840     (gnus-message 7 "Sorting articles...")
4841     (prog1
4842         (setq gnus-newsgroup-headers
4843               (sort articles (gnus-make-sort-function
4844                               gnus-article-sort-functions)))
4845       (gnus-message 7 "Sorting articles...done"))))
4846
4847 ;; Written by Hallvard B Furuseth <h.b.furuseth@usit.uio.no>.
4848 (defmacro gnus-thread-header (thread)
4849   "Return header of first article in THREAD.
4850 Note that THREAD must never, ever be anything else than a variable -
4851 using some other form will lead to serious barfage."
4852   (or (symbolp thread) (signal 'wrong-type-argument '(symbolp thread)))
4853   ;; (8% speedup to gnus-summary-prepare, just for fun :-)
4854   (list 'byte-code "\10\211:\203\17\0\211@;\203\16\0A@@\207"
4855         (vector thread) 2))
4856
4857 (defsubst gnus-article-sort-by-number (h1 h2)
4858   "Sort articles by article number."
4859   (< (mail-header-number h1)
4860      (mail-header-number h2)))
4861
4862 (defun gnus-thread-sort-by-number (h1 h2)
4863   "Sort threads by root article number."
4864   (gnus-article-sort-by-number
4865    (gnus-thread-header h1) (gnus-thread-header h2)))
4866
4867 (defsubst gnus-article-sort-by-random (h1 h2)
4868   "Sort articles randomly."
4869   (zerop (random 2)))
4870
4871 (defun gnus-thread-sort-by-random (h1 h2)
4872   "Sort threads randomly."
4873   (gnus-article-sort-by-random
4874    (gnus-thread-header h1) (gnus-thread-header h2)))
4875
4876 (defsubst gnus-article-sort-by-lines (h1 h2)
4877   "Sort articles by article Lines header."
4878   (< (mail-header-lines h1)
4879      (mail-header-lines h2)))
4880
4881 (defun gnus-thread-sort-by-lines (h1 h2)
4882   "Sort threads by root article Lines header."
4883   (gnus-article-sort-by-lines
4884    (gnus-thread-header h1) (gnus-thread-header h2)))
4885
4886 (defsubst gnus-article-sort-by-chars (h1 h2)
4887   "Sort articles by octet length."
4888   (< (mail-header-chars h1)
4889      (mail-header-chars h2)))
4890
4891 (defun gnus-thread-sort-by-chars (h1 h2)
4892   "Sort threads by root article octet length."
4893   (gnus-article-sort-by-chars
4894    (gnus-thread-header h1) (gnus-thread-header h2)))
4895
4896 (defsubst gnus-article-sort-by-author (h1 h2)
4897   "Sort articles by root author."
4898   (gnus-string<
4899    (let ((extract (funcall
4900                    gnus-extract-address-components
4901                    (mail-header-from h1))))
4902      (or (car extract) (cadr extract) ""))
4903    (let ((extract (funcall
4904                    gnus-extract-address-components
4905                    (mail-header-from h2))))
4906      (or (car extract) (cadr extract) ""))))
4907
4908 (defun gnus-thread-sort-by-author (h1 h2)
4909   "Sort threads by root author."
4910   (gnus-article-sort-by-author
4911    (gnus-thread-header h1)  (gnus-thread-header h2)))
4912
4913 (defsubst gnus-article-sort-by-recipient (h1 h2)
4914   "Sort articles by recipient."
4915   (gnus-string<
4916    (let ((extract (funcall
4917                    gnus-extract-address-components
4918                    (or (cdr (assq 'To (mail-header-extra h1))) ""))))
4919      (or (car extract) (cadr extract)))
4920    (let ((extract (funcall
4921                    gnus-extract-address-components
4922                    (or (cdr (assq 'To (mail-header-extra h2))) ""))))
4923      (or (car extract) (cadr extract)))))
4924
4925 (defun gnus-thread-sort-by-recipient (h1 h2)
4926   "Sort threads by root recipient."
4927   (gnus-article-sort-by-recipient
4928    (gnus-thread-header h1) (gnus-thread-header h2)))
4929
4930 (defsubst gnus-article-sort-by-subject (h1 h2)
4931   "Sort articles by root subject."
4932   (gnus-string<
4933    (downcase (gnus-simplify-subject-re (mail-header-subject h1)))
4934    (downcase (gnus-simplify-subject-re (mail-header-subject h2)))))
4935
4936 (defun gnus-thread-sort-by-subject (h1 h2)
4937   "Sort threads by root subject."
4938   (gnus-article-sort-by-subject
4939    (gnus-thread-header h1) (gnus-thread-header h2)))
4940
4941 (defsubst gnus-article-sort-by-date (h1 h2)
4942   "Sort articles by root article date."
4943   (time-less-p
4944    (gnus-date-get-time (mail-header-date h1))
4945    (gnus-date-get-time (mail-header-date h2))))
4946
4947 (defun gnus-thread-sort-by-date (h1 h2)
4948   "Sort threads by root article date."
4949   (gnus-article-sort-by-date
4950    (gnus-thread-header h1) (gnus-thread-header h2)))
4951
4952 (defsubst gnus-article-sort-by-score (h1 h2)
4953   "Sort articles by root article score.
4954 Unscored articles will be counted as having a score of zero."
4955   (> (or (cdr (assq (mail-header-number h1)
4956                     gnus-newsgroup-scored))
4957          gnus-summary-default-score 0)
4958      (or (cdr (assq (mail-header-number h2)
4959                     gnus-newsgroup-scored))
4960          gnus-summary-default-score 0)))
4961
4962 (defun gnus-thread-sort-by-score (h1 h2)
4963   "Sort threads by root article score."
4964   (gnus-article-sort-by-score
4965    (gnus-thread-header h1) (gnus-thread-header h2)))
4966
4967 (defun gnus-thread-sort-by-total-score (h1 h2)
4968   "Sort threads by the sum of all scores in the thread.
4969 Unscored articles will be counted as having a score of zero."
4970   (> (gnus-thread-total-score h1) (gnus-thread-total-score h2)))
4971
4972 (defun gnus-thread-total-score (thread)
4973   ;; This function find the total score of THREAD.
4974   (cond
4975    ((null thread)
4976     0)
4977    ((consp thread)
4978     (if (stringp (car thread))
4979         (apply gnus-thread-score-function 0
4980                (mapcar 'gnus-thread-total-score-1 (cdr thread)))
4981       (gnus-thread-total-score-1 thread)))
4982    (t
4983     (gnus-thread-total-score-1 (list thread)))))
4984
4985 (defun gnus-article-sort-by-most-recent-number (h1 h2)
4986   "Sort articles by number."
4987   (gnus-article-sort-by-number h1 h2))
4988
4989 (defun gnus-thread-sort-by-most-recent-number (h1 h2)
4990   "Sort threads such that the thread with the most recently arrived article comes first."
4991   (> (gnus-thread-highest-number h1) (gnus-thread-highest-number h2)))
4992
4993 (defun gnus-thread-highest-number (thread)
4994   "Return the highest article number in THREAD."
4995   (apply 'max (mapcar (lambda (header)
4996                         (mail-header-number header))
4997                       (message-flatten-list thread))))
4998
4999 (defun gnus-article-sort-by-most-recent-date (h1 h2)
5000   "Sort articles by number."
5001   (gnus-article-sort-by-date h1 h2))
5002
5003 (defun gnus-thread-sort-by-most-recent-date (h1 h2)
5004   "Sort threads such that the thread with the most recently dated article comes first."
5005   (> (gnus-thread-latest-date h1) (gnus-thread-latest-date h2)))
5006
5007 ; Since this is called not only to sort the top-level threads, but
5008 ; also in recursive sorts to order the articles within a thread, each
5009 ; article will be processed many times.  Thus it speeds things up
5010 ; quite a bit to use gnus-date-get-time, which caches the time value.
5011 (defun gnus-thread-latest-date (thread)
5012   "Return the highest article date in THREAD."
5013   (apply 'max
5014          (mapcar (lambda (header) (gnus-float-time
5015                                    (gnus-date-get-time
5016                                     (mail-header-date header))))
5017                  (message-flatten-list thread))))
5018
5019 (defun gnus-thread-total-score-1 (root)
5020   ;; This function find the total score of the thread below ROOT.
5021   (setq root (car root))
5022   (apply gnus-thread-score-function
5023          (or (append
5024               (mapcar 'gnus-thread-total-score
5025                       (cdr (gnus-id-to-thread (mail-header-id root))))
5026               (when (> (mail-header-number root) 0)
5027                 (list (or (cdr (assq (mail-header-number root)
5028                                      gnus-newsgroup-scored))
5029                           gnus-summary-default-score 0))))
5030              (list gnus-summary-default-score)
5031              '(0))))
5032
5033 ;; Added by Per Abrahamsen <amanda@iesd.auc.dk>.
5034 (defvar gnus-tmp-prev-subject nil)
5035 (defvar gnus-tmp-false-parent nil)
5036 (defvar gnus-tmp-root-expunged nil)
5037 (defvar gnus-tmp-dummy-line nil)
5038
5039 (defun gnus-extra-header (type &optional header)
5040   "Return the extra header of TYPE."
5041   (or (cdr (assq type (mail-header-extra (or header gnus-tmp-header))))
5042       ""))
5043
5044 (defvar gnus-tmp-thread-tree-header-string "")
5045
5046 (defcustom gnus-sum-thread-tree-root "> "
5047   "With %B spec, used for the root of a thread.
5048 If nil, use subject instead."
5049   :version "22.1"
5050   :type '(radio (const :format "%v  " nil) string)
5051   :group 'gnus-thread)
5052
5053 (defcustom gnus-sum-thread-tree-false-root "> "
5054   "With %B spec, used for a false root of a thread.
5055 If nil, use subject instead."
5056   :version "22.1"
5057   :type '(radio (const :format "%v  " nil) string)
5058   :group 'gnus-thread)
5059
5060 (defcustom gnus-sum-thread-tree-single-indent ""
5061   "With %B spec, used for a thread with just one message.
5062 If nil, use subject instead."
5063   :version "22.1"
5064   :type '(radio (const :format "%v  " nil) string)
5065   :group 'gnus-thread)
5066
5067 (defcustom gnus-sum-thread-tree-vertical "| "
5068   "With %B spec, used for drawing a vertical line."
5069   :version "22.1"
5070   :type 'string
5071   :group 'gnus-thread)
5072
5073 (defcustom gnus-sum-thread-tree-indent "  "
5074   "With %B spec, used for indenting."
5075   :version "22.1"
5076   :type 'string
5077   :group 'gnus-thread)
5078
5079 (defcustom gnus-sum-thread-tree-leaf-with-other "+-> "
5080   "With %B spec, used for a leaf with brothers."
5081   :version "22.1"
5082   :type 'string
5083   :group 'gnus-thread)
5084
5085 (defcustom gnus-sum-thread-tree-single-leaf "\\-> "
5086   "With %B spec, used for a leaf without brothers."
5087   :version "22.1"
5088   :type 'string
5089   :group 'gnus-thread)
5090
5091 (defcustom gnus-summary-display-while-building nil
5092   "If non-nil, show and update the summary buffer as it's being built.
5093 If the value is t, update the buffer after every line is inserted.  If
5094 the value is an integer (N), update the display every N lines."
5095   :version "22.1"
5096   :group 'gnus-thread
5097   :type '(choice (const :tag "off" nil)
5098                  number
5099                  (const :tag "frequently" t)))
5100
5101 (defun gnus-summary-prepare-threads (threads)
5102   "Prepare summary buffer from THREADS and indentation LEVEL.
5103 THREADS is either a list of `(PARENT [(CHILD1 [(GRANDCHILD ...]...) ...])'
5104 or a straight list of headers."
5105   (gnus-message 7 "Generating summary...")
5106
5107   (setq gnus-newsgroup-threads threads)
5108   (beginning-of-line)
5109
5110   (let ((gnus-tmp-level 0)
5111         (default-score (or gnus-summary-default-score 0))
5112         (gnus-visual-p (gnus-visual-p 'summary-highlight 'highlight))
5113         (building-line-count gnus-summary-display-while-building)
5114         (building-count (integerp gnus-summary-display-while-building))
5115         thread number subject stack state gnus-tmp-gathered beg-match
5116         new-roots gnus-tmp-new-adopts thread-end simp-subject
5117         gnus-tmp-header gnus-tmp-unread gnus-tmp-downloaded
5118         gnus-tmp-replied gnus-tmp-subject-or-nil
5119         gnus-tmp-dummy gnus-tmp-indentation gnus-tmp-lines gnus-tmp-score
5120         gnus-tmp-score-char gnus-tmp-from gnus-tmp-name
5121         gnus-tmp-number gnus-tmp-opening-bracket gnus-tmp-closing-bracket
5122         tree-stack)
5123
5124     (setq gnus-tmp-prev-subject nil
5125           gnus-tmp-thread-tree-header-string "")
5126
5127     (if (vectorp (car threads))
5128         ;; If this is a straight (sic) list of headers, then a
5129         ;; threaded summary display isn't required, so we just create
5130         ;; an unthreaded one.
5131         (gnus-summary-prepare-unthreaded threads)
5132
5133       ;; Do the threaded display.
5134
5135       (if gnus-summary-display-while-building
5136           (switch-to-buffer (buffer-name)))
5137       (while (or threads stack gnus-tmp-new-adopts new-roots)
5138
5139         (if (and (= gnus-tmp-level 0)
5140                  (or (not stack)
5141                      (= (caar stack) 0))
5142                  (not gnus-tmp-false-parent)
5143                  (or gnus-tmp-new-adopts new-roots))
5144             (if gnus-tmp-new-adopts
5145                 (setq gnus-tmp-level (if gnus-tmp-root-expunged 0 1)
5146                       thread (list (car gnus-tmp-new-adopts))
5147                       gnus-tmp-header (caar thread)
5148                       gnus-tmp-new-adopts (cdr gnus-tmp-new-adopts))
5149               (when new-roots
5150                 (setq thread (list (car new-roots))
5151                       gnus-tmp-header (caar thread)
5152                       new-roots (cdr new-roots))))
5153
5154           (if threads
5155               ;; If there are some threads, we do them before the
5156               ;; threads on the stack.
5157               (setq thread threads
5158                     gnus-tmp-header (caar thread))
5159             ;; There were no current threads, so we pop something off
5160             ;; the stack.
5161             (setq state (car stack)
5162                   gnus-tmp-level (car state)
5163                   tree-stack (cadr state)
5164                   thread (caddr state)
5165                   stack (cdr stack)
5166                   gnus-tmp-header (caar thread))))
5167
5168         (setq gnus-tmp-false-parent nil)
5169         (setq gnus-tmp-root-expunged nil)
5170         (setq thread-end nil)
5171
5172         (if (stringp gnus-tmp-header)
5173             ;; The header is a dummy root.
5174             (cond
5175              ((eq gnus-summary-make-false-root 'adopt)
5176               ;; We let the first article adopt the rest.
5177               (setq gnus-tmp-new-adopts (nconc gnus-tmp-new-adopts
5178                                                (cddar thread)))
5179               (setq gnus-tmp-gathered
5180                     (nconc (mapcar
5181                             (lambda (h) (mail-header-number (car h)))
5182                             (cddar thread))
5183                            gnus-tmp-gathered))
5184               (setq thread (cons (list (caar thread)
5185                                        (cadar thread))
5186                                  (cdr thread)))
5187               (setq gnus-tmp-level -1
5188                     gnus-tmp-false-parent t))
5189              ((eq gnus-summary-make-false-root 'empty)
5190               ;; We print adopted articles with empty subject fields.
5191               (setq gnus-tmp-gathered
5192                     (nconc (mapcar
5193                             (lambda (h) (mail-header-number (car h)))
5194                             (cddar thread))
5195                            gnus-tmp-gathered))
5196               (setq gnus-tmp-level -1))
5197              ((eq gnus-summary-make-false-root 'dummy)
5198               ;; We remember that we probably want to output a dummy
5199               ;; root.
5200               (setq gnus-tmp-dummy-line gnus-tmp-header)
5201               (setq gnus-tmp-prev-subject gnus-tmp-header))
5202              (t
5203               ;; We do not make a root for the gathered
5204               ;; sub-threads at all.
5205               (setq gnus-tmp-level -1)))
5206
5207           (setq number (mail-header-number gnus-tmp-header)
5208                 subject (mail-header-subject gnus-tmp-header)
5209                 simp-subject (gnus-simplify-subject-fully subject))
5210
5211           (cond
5212            ;; If the thread has changed subject, we might want to make
5213            ;; this subthread into a root.
5214            ((and (null gnus-thread-ignore-subject)
5215                  (not (zerop gnus-tmp-level))
5216                  gnus-tmp-prev-subject
5217                  (not (string= gnus-tmp-prev-subject simp-subject)))
5218             (setq new-roots (nconc new-roots (list (car thread)))
5219                   thread-end t
5220                   gnus-tmp-header nil))
5221            ;; If the article lies outside the current limit,
5222            ;; then we do not display it.
5223            ((not (memq number gnus-newsgroup-limit))
5224             (setq gnus-tmp-gathered
5225                   (nconc (mapcar
5226                           (lambda (h) (mail-header-number (car h)))
5227                           (cdar thread))
5228                          gnus-tmp-gathered))
5229             (setq gnus-tmp-new-adopts (if (cdar thread)
5230                                           (append gnus-tmp-new-adopts
5231                                                   (cdar thread))
5232                                         gnus-tmp-new-adopts)
5233                   thread-end t
5234                   gnus-tmp-header nil)
5235             (when (zerop gnus-tmp-level)
5236               (setq gnus-tmp-root-expunged t)))
5237            ;; Perhaps this article is to be marked as read?
5238            ((and gnus-summary-mark-below
5239                  (< (or (cdr (assq number gnus-newsgroup-scored))
5240                         default-score)
5241                     gnus-summary-mark-below)
5242                  ;; Don't touch sparse articles.
5243                  (not (gnus-summary-article-sparse-p number))
5244                  (not (gnus-summary-article-ancient-p number)))
5245             (setq gnus-newsgroup-unreads
5246                   (delq number gnus-newsgroup-unreads))
5247             (if gnus-newsgroup-auto-expire
5248                 (setq gnus-newsgroup-expirable
5249                       (gnus-add-to-sorted-list
5250                        gnus-newsgroup-expirable number))
5251               (push (cons number gnus-low-score-mark)
5252                     gnus-newsgroup-reads))))
5253
5254           (when gnus-tmp-header
5255             ;; We may have an old dummy line to output before this
5256             ;; article.
5257             (when (and gnus-tmp-dummy-line
5258                        (gnus-subject-equal
5259                         gnus-tmp-dummy-line
5260                         (mail-header-subject gnus-tmp-header)))
5261               (gnus-summary-insert-dummy-line
5262                gnus-tmp-dummy-line (mail-header-number gnus-tmp-header))
5263               (setq gnus-tmp-dummy-line nil))
5264
5265             ;; Compute the mark.
5266             (setq gnus-tmp-unread (gnus-article-mark number))
5267
5268             (push (gnus-data-make number gnus-tmp-unread (1+ (point))
5269                                   gnus-tmp-header gnus-tmp-level)
5270                   gnus-newsgroup-data)
5271
5272             ;; Actually insert the line.
5273             (setq
5274              gnus-tmp-subject-or-nil
5275              (cond
5276               ((and gnus-thread-ignore-subject
5277                     gnus-tmp-prev-subject
5278                     (not (string= gnus-tmp-prev-subject simp-subject)))
5279                subject)
5280               ((zerop gnus-tmp-level)
5281                (if (and (eq gnus-summary-make-false-root 'empty)
5282                         (memq number gnus-tmp-gathered)
5283                         gnus-tmp-prev-subject
5284                         (string= gnus-tmp-prev-subject simp-subject))
5285                    gnus-summary-same-subject
5286                  subject))
5287               (t gnus-summary-same-subject)))
5288             (if (and (eq gnus-summary-make-false-root 'adopt)
5289                      (= gnus-tmp-level 1)
5290                      (memq number gnus-tmp-gathered))
5291                 (setq gnus-tmp-opening-bracket ?\<
5292                       gnus-tmp-closing-bracket ?\>)
5293               (setq gnus-tmp-opening-bracket ?\[
5294                     gnus-tmp-closing-bracket ?\]))
5295             (if (>= gnus-tmp-level (length gnus-thread-indent-array))
5296                 (gnus-make-thread-indent-array
5297                  (max (* 2 (length gnus-thread-indent-array))
5298                       gnus-tmp-level)))
5299             (setq
5300              gnus-tmp-indentation
5301              (aref gnus-thread-indent-array gnus-tmp-level)
5302              gnus-tmp-lines (mail-header-lines gnus-tmp-header)
5303              gnus-tmp-score (or (cdr (assq number gnus-newsgroup-scored))
5304                                 gnus-summary-default-score 0)
5305              gnus-tmp-score-char
5306              (if (or (null gnus-summary-default-score)
5307                      (<= (abs (- gnus-tmp-score gnus-summary-default-score))
5308                          gnus-summary-zcore-fuzz))
5309                  ?                      ;Whitespace
5310                (if (< gnus-tmp-score gnus-summary-default-score)
5311                    gnus-score-below-mark gnus-score-over-mark))
5312              gnus-tmp-replied
5313              (cond ((memq number gnus-newsgroup-processable)
5314                     gnus-process-mark)
5315                    ((memq number gnus-newsgroup-cached)
5316                     gnus-cached-mark)
5317                    ((memq number gnus-newsgroup-replied)
5318                     gnus-replied-mark)
5319                    ((memq number gnus-newsgroup-forwarded)
5320                     gnus-forwarded-mark)
5321                    ((memq number gnus-newsgroup-saved)
5322                     gnus-saved-mark)
5323                    ((memq number gnus-newsgroup-recent)
5324                     gnus-recent-mark)
5325                    ((memq number gnus-newsgroup-unseen)
5326                     gnus-unseen-mark)
5327                    (t gnus-no-mark))
5328              gnus-tmp-downloaded
5329              (cond ((memq number gnus-newsgroup-undownloaded)
5330                     gnus-undownloaded-mark)
5331                    (gnus-newsgroup-agentized
5332                     gnus-downloaded-mark)
5333                    (t
5334                     gnus-no-mark))
5335              gnus-tmp-from (mail-header-from gnus-tmp-header)
5336              gnus-tmp-name
5337              (cond
5338               ((string-match "<[^>]+> *$" gnus-tmp-from)
5339                (setq beg-match (match-beginning 0))
5340                (or (and (string-match "^\".+\"" gnus-tmp-from)
5341                         (substring gnus-tmp-from 1 (1- (match-end 0))))
5342                    (substring gnus-tmp-from 0 beg-match)))
5343               ((string-match "(.+)" gnus-tmp-from)
5344                (substring gnus-tmp-from
5345                           (1+ (match-beginning 0)) (1- (match-end 0))))
5346               (t gnus-tmp-from))
5347
5348              ;; Do the %B string
5349              gnus-tmp-thread-tree-header-string
5350              (cond
5351               ((not gnus-show-threads) "")
5352               ((zerop gnus-tmp-level)
5353                (cond ((cdar thread)
5354                       (or gnus-sum-thread-tree-root subject))
5355                      (gnus-tmp-new-adopts
5356                       (or gnus-sum-thread-tree-false-root subject))
5357                      (t
5358                       (or gnus-sum-thread-tree-single-indent subject))))
5359               (t
5360                (concat (apply 'concat
5361                               (mapcar (lambda (item)
5362                                         (if (= item 1)
5363                                             gnus-sum-thread-tree-vertical
5364                                           gnus-sum-thread-tree-indent))
5365                                       (cdr (reverse tree-stack))))
5366                        (if (nth 1 thread)
5367                            gnus-sum-thread-tree-leaf-with-other
5368                          gnus-sum-thread-tree-single-leaf)))))
5369             (when (string= gnus-tmp-name "")
5370               (setq gnus-tmp-name gnus-tmp-from))
5371             (unless (numberp gnus-tmp-lines)
5372               (setq gnus-tmp-lines -1))
5373             (if (= gnus-tmp-lines -1)
5374                 (setq gnus-tmp-lines "?")
5375               (setq gnus-tmp-lines (number-to-string gnus-tmp-lines)))
5376             (gnus-put-text-property
5377              (point)
5378              (progn (eval gnus-summary-line-format-spec) (point))
5379              'gnus-number number)
5380             (when gnus-visual-p
5381               (forward-line -1)
5382               (gnus-summary-highlight-line)
5383               (when gnus-summary-update-hook
5384                 (gnus-run-hooks 'gnus-summary-update-hook))
5385               (forward-line 1))
5386
5387             (setq gnus-tmp-prev-subject simp-subject)))
5388
5389         (when (nth 1 thread)
5390           (push (list (max 0 gnus-tmp-level)
5391                       (copy-sequence tree-stack)
5392                       (nthcdr 1 thread))
5393                 stack))
5394         (push (if (nth 1 thread) 1 0) tree-stack)
5395         (incf gnus-tmp-level)
5396         (setq threads (if thread-end nil (cdar thread)))
5397         (if gnus-summary-display-while-building
5398             (if building-count
5399                 (progn
5400                   ;; use a set frequency
5401                   (setq building-line-count (1- building-line-count))
5402                   (when (= building-line-count 0)
5403                     (sit-for 0)
5404                     (setq building-line-count
5405                           gnus-summary-display-while-building)))
5406               ;; always
5407               (sit-for 0)))
5408         (unless threads
5409           (setq gnus-tmp-level 0)))))
5410   (gnus-message 7 "Generating summary...done"))
5411
5412 (defun gnus-summary-prepare-unthreaded (headers)
5413   "Generate an unthreaded summary buffer based on HEADERS."
5414   (let (header number mark)
5415
5416     (beginning-of-line)
5417
5418     (while headers
5419       ;; We may have to root out some bad articles...
5420       (when (memq (setq number (mail-header-number
5421                                 (setq header (pop headers))))
5422                   gnus-newsgroup-limit)
5423         ;; Mark article as read when it has a low score.
5424         (when (and gnus-summary-mark-below
5425                    (< (or (cdr (assq number gnus-newsgroup-scored))
5426                           gnus-summary-default-score 0)
5427                       gnus-summary-mark-below)
5428                    (not (gnus-summary-article-ancient-p number)))
5429           (setq gnus-newsgroup-unreads
5430                 (delq number gnus-newsgroup-unreads))
5431           (if gnus-newsgroup-auto-expire
5432               (push number gnus-newsgroup-expirable)
5433             (push (cons number gnus-low-score-mark)
5434                   gnus-newsgroup-reads)))
5435
5436         (setq mark (gnus-article-mark number))
5437         (push (gnus-data-make number mark (1+ (point)) header 0)
5438               gnus-newsgroup-data)
5439         (gnus-summary-insert-line
5440          header 0 number
5441          (memq number gnus-newsgroup-undownloaded)
5442          mark (memq number gnus-newsgroup-replied)
5443          (memq number gnus-newsgroup-expirable)
5444          (mail-header-subject header) nil
5445          (cdr (assq number gnus-newsgroup-scored))
5446          (memq number gnus-newsgroup-processable))))))
5447
5448 (defun gnus-summary-remove-list-identifiers ()
5449   "Remove list identifiers in `gnus-list-identifiers' from articles in the current group."
5450   (let ((regexp (if (consp gnus-list-identifiers)
5451                     (mapconcat 'identity gnus-list-identifiers " *\\|")
5452                   gnus-list-identifiers))
5453         changed subject)
5454     (when regexp
5455       (setq regexp (concat "^\\(?:R[Ee]: +\\)*\\(" regexp " *\\)"))
5456       (dolist (header gnus-newsgroup-headers)
5457         (setq subject (mail-header-subject header)
5458               changed nil)
5459         (while (string-match regexp subject)
5460           (setq subject
5461                 (concat (substring subject 0 (match-beginning 1))
5462                         (substring subject (match-end 0)))
5463                 changed t))
5464         (when changed
5465           (when (string-match "^\\(\\(?:R[Ee]: +\\)+\\)R[Ee]: +" subject)
5466             (setq subject
5467                   (concat (substring subject 0 (match-beginning 1))
5468                           (substring subject (match-end 1)))))
5469           (mail-header-set-subject header subject))))))
5470
5471 (defun gnus-fetch-headers (articles)
5472   "Fetch headers of ARTICLES."
5473   (let ((name (gnus-group-decoded-name gnus-newsgroup-name)))
5474     (gnus-message 5 "Fetching headers for %s..." name)
5475     (prog1
5476         (if (eq 'nov
5477                 (setq gnus-headers-retrieved-by
5478                       (gnus-retrieve-headers
5479                        articles gnus-newsgroup-name
5480                        ;; We might want to fetch old headers, but
5481                        ;; not if there is only 1 article.
5482                        (and (or (and
5483                                  (not (eq gnus-fetch-old-headers 'some))
5484                                  (not (numberp gnus-fetch-old-headers)))
5485                                 (> (length articles) 1))
5486                             gnus-fetch-old-headers))))
5487             (gnus-get-newsgroup-headers-xover
5488              articles nil nil gnus-newsgroup-name t)
5489           (gnus-get-newsgroup-headers))
5490       (gnus-message 5 "Fetching headers for %s...done" name))))
5491
5492 (defun gnus-select-newsgroup (group &optional read-all select-articles)
5493   "Select newsgroup GROUP.
5494 If READ-ALL is non-nil, all articles in the group are selected.
5495 If SELECT-ARTICLES, only select those articles from GROUP."
5496   (let* ((entry (gnus-group-entry group))
5497          ;;!!! Dirty hack; should be removed.
5498          (gnus-summary-ignore-duplicates
5499           (if (eq (car (gnus-find-method-for-group group)) 'nnvirtual)
5500               t
5501             gnus-summary-ignore-duplicates))
5502          (info (nth 2 entry))
5503          charset articles fetched-articles cached)
5504
5505     (unless (gnus-check-server
5506              (set (make-local-variable 'gnus-current-select-method)
5507                   (gnus-find-method-for-group group)))
5508       (error "Couldn't open server"))
5509     (setq charset (gnus-group-name-charset gnus-current-select-method group))
5510
5511     (or (and entry (not (eq (car entry) t))) ; Either it's active...
5512         (gnus-activate-group group)     ; Or we can activate it...
5513         (progn                          ; Or we bug out.
5514           (when (equal major-mode 'gnus-summary-mode)
5515             (gnus-kill-buffer (current-buffer)))
5516           (error
5517            "Couldn't activate group %s: %s"
5518            (mm-decode-coding-string group charset)
5519            (mm-decode-coding-string (gnus-status-message group) charset))))
5520
5521     (unless (gnus-request-group group t)
5522       (when (equal major-mode 'gnus-summary-mode)
5523         (gnus-kill-buffer (current-buffer)))
5524       (error "Couldn't request group %s: %s"
5525              (mm-decode-coding-string group charset)
5526              (mm-decode-coding-string (gnus-status-message group) charset)))
5527
5528     (when gnus-agent
5529       (gnus-agent-possibly-alter-active group (gnus-active group) info)
5530
5531       (setq gnus-summary-use-undownloaded-faces
5532             (gnus-agent-find-parameter
5533              group
5534              'agent-enable-undownloaded-faces)))
5535
5536     (setq gnus-newsgroup-name group
5537           gnus-newsgroup-unselected nil
5538           gnus-newsgroup-unreads (gnus-list-of-unread-articles group))
5539
5540     (let ((display (gnus-group-find-parameter group 'display)))
5541       (setq gnus-newsgroup-display
5542             (cond
5543              ((not (zerop (or (car-safe read-all) 0)))
5544               ;; The user entered the group with C-u SPC/RET, let's show
5545               ;; all articles.
5546               'gnus-not-ignore)
5547              ((eq display 'all)
5548               'gnus-not-ignore)
5549              ((arrayp display)
5550               (gnus-summary-display-make-predicate (mapcar 'identity display)))
5551              ((numberp display)
5552               ;; The following is probably the "correct" solution, but
5553               ;; it makes Gnus fetch all headers and then limit the
5554               ;; articles (which is slow), so instead we hack the
5555               ;; select-articles parameter instead. -- Simon Josefsson
5556               ;; <jas@kth.se>
5557               ;;
5558               ;; (gnus-byte-compile
5559               ;;  `(lambda () (> number ,(- (cdr (gnus-active group))
5560               ;;                         display)))))
5561               (setq select-articles
5562                     (gnus-uncompress-range
5563                      (cons (let ((tmp (- (cdr (gnus-active group)) display)))
5564                              (if (> tmp 0)
5565                                  tmp
5566                                1))
5567                            (cdr (gnus-active group)))))
5568               nil)
5569              (t
5570               nil))))
5571
5572     (gnus-summary-setup-default-charset)
5573
5574     ;; Kludge to avoid having cached articles nixed out in virtual groups.
5575     (when (gnus-virtual-group-p group)
5576       (setq cached gnus-newsgroup-cached))
5577
5578     (setq gnus-newsgroup-unreads
5579           (gnus-sorted-ndifference
5580            (gnus-sorted-ndifference gnus-newsgroup-unreads
5581                                     gnus-newsgroup-marked)
5582            gnus-newsgroup-dormant))
5583
5584     (setq gnus-newsgroup-processable nil)
5585
5586     (gnus-update-read-articles group gnus-newsgroup-unreads)
5587
5588     ;; Adjust and set lists of article marks.
5589     (when info
5590       (gnus-adjust-marked-articles info))
5591     (if (setq articles select-articles)
5592         (setq gnus-newsgroup-unselected
5593               (gnus-sorted-difference gnus-newsgroup-unreads articles))
5594       (setq articles (gnus-articles-to-read group read-all)))
5595
5596     (cond
5597      ((null articles)
5598       ;;(gnus-message 3 "Couldn't select newsgroup -- no articles to display")
5599       'quit)
5600      ((eq articles 0) nil)
5601      (t
5602       ;; Init the dependencies hash table.
5603       (setq gnus-newsgroup-dependencies
5604             (gnus-make-hashtable (length articles)))
5605       (gnus-set-global-variables)
5606       ;; Retrieve the headers and read them in.
5607
5608       (setq gnus-newsgroup-headers (gnus-fetch-headers articles))
5609
5610       ;; Kludge to avoid having cached articles nixed out in virtual groups.
5611       (when cached
5612         (setq gnus-newsgroup-cached cached))
5613
5614       ;; Suppress duplicates?
5615       (when gnus-suppress-duplicates
5616         (gnus-dup-suppress-articles))
5617
5618       ;; Set the initial limit.
5619       (setq gnus-newsgroup-limit (copy-sequence articles))
5620       ;; Remove canceled articles from the list of unread articles.
5621       (setq fetched-articles
5622             (mapcar (lambda (headers) (mail-header-number headers))
5623                     gnus-newsgroup-headers))
5624       (setq gnus-newsgroup-articles fetched-articles)
5625       (setq gnus-newsgroup-unreads
5626             (gnus-sorted-nintersection
5627              gnus-newsgroup-unreads fetched-articles))
5628       (gnus-compute-unseen-list)
5629
5630       ;; Removed marked articles that do not exist.
5631       (gnus-update-missing-marks
5632        (gnus-sorted-difference articles fetched-articles))
5633       ;; We might want to build some more threads first.
5634       (when (and gnus-fetch-old-headers
5635                  (eq gnus-headers-retrieved-by 'nov))
5636         (if (eq gnus-fetch-old-headers 'invisible)
5637             (gnus-build-all-threads)
5638           (gnus-build-old-threads)))
5639       ;; Let the Gnus agent mark articles as read.
5640       (when gnus-agent
5641         (gnus-agent-get-undownloaded-list))
5642       ;; Remove list identifiers from subject
5643       (when gnus-list-identifiers
5644         (gnus-summary-remove-list-identifiers))
5645       ;; Check whether auto-expire is to be done in this group.
5646       (setq gnus-newsgroup-auto-expire
5647             (gnus-group-auto-expirable-p group))
5648       ;; Set up the article buffer now, if necessary.
5649       (unless (and gnus-single-article-buffer
5650                    (equal gnus-article-buffer "*Article*"))
5651         (gnus-article-setup-buffer))
5652       ;; First and last article in this newsgroup.
5653       (when gnus-newsgroup-headers
5654         (setq gnus-newsgroup-begin
5655               (mail-header-number (car gnus-newsgroup-headers))
5656               gnus-newsgroup-end
5657               (mail-header-number
5658                (gnus-last-element gnus-newsgroup-headers))))
5659       ;; GROUP is successfully selected.
5660       (or gnus-newsgroup-headers t)))))
5661
5662 (defun gnus-compute-unseen-list ()
5663   ;; The `seen' marks are treated specially.
5664   (if (not gnus-newsgroup-seen)
5665       (setq gnus-newsgroup-unseen gnus-newsgroup-articles)
5666     (setq gnus-newsgroup-unseen
5667           (gnus-inverse-list-range-intersection
5668            gnus-newsgroup-articles gnus-newsgroup-seen))))
5669
5670 (declare-function gnus-get-predicate "gnus-agent" (predicate))
5671
5672 (defun gnus-summary-display-make-predicate (display)
5673   (require 'gnus-agent)
5674   (when (= (length display) 1)
5675     (setq display (car display)))
5676   (unless gnus-summary-display-cache
5677     (dolist (elem (append '((unread . unread)
5678                             (read . read)
5679                             (unseen . unseen))
5680                           gnus-article-mark-lists))
5681       (push (cons (cdr elem)
5682                   (gnus-byte-compile    ;Why bother?
5683                    `(lambda () (gnus-article-marked-p ',(cdr elem)))))
5684             gnus-summary-display-cache)))
5685   (let ((gnus-category-predicate-alist gnus-summary-display-cache)
5686         (gnus-category-predicate-cache gnus-summary-display-cache))
5687     (gnus-get-predicate display)))
5688
5689 ;; Uses the dynamically bound `gnus-number' variable.
5690 (defvar gnus-number)
5691 (defun gnus-article-marked-p (type &optional article)
5692   (let ((article (or article gnus-number)))
5693     (cond
5694      ((eq type 'tick)
5695       (memq article gnus-newsgroup-marked))
5696      ((eq type 'spam)
5697       (memq article gnus-newsgroup-spam-marked))
5698      ((eq type 'unsend)
5699       (memq article gnus-newsgroup-unsendable))
5700      ((eq type 'undownload)
5701       (memq article gnus-newsgroup-undownloaded))
5702      ((eq type 'download)
5703       (memq article gnus-newsgroup-downloadable))
5704      ((eq type 'unread)
5705       (memq article gnus-newsgroup-unreads))
5706      ((eq type 'read)
5707       (memq article gnus-newsgroup-reads))
5708      ((eq type 'dormant)
5709       (memq article gnus-newsgroup-dormant) )
5710      ((eq type 'expire)
5711       (memq article gnus-newsgroup-expirable))
5712      ((eq type 'reply)
5713       (memq article gnus-newsgroup-replied))
5714      ((eq type 'killed)
5715       (memq article gnus-newsgroup-killed))
5716      ((eq type 'bookmark)
5717       (assq article gnus-newsgroup-bookmarks))
5718      ((eq type 'score)
5719       (assq article gnus-newsgroup-scored))
5720      ((eq type 'save)
5721       (memq article gnus-newsgroup-saved))
5722      ((eq type 'cache)
5723       (memq article gnus-newsgroup-cached))
5724      ((eq type 'forward)
5725       (memq article gnus-newsgroup-forwarded))
5726      ((eq type 'seen)
5727       (not (memq article gnus-newsgroup-unseen)))
5728      ((eq type 'recent)
5729       (memq article gnus-newsgroup-recent))
5730      (t t))))
5731
5732 (defun gnus-articles-to-read (group &optional read-all)
5733   "Find out what articles the user wants to read."
5734   (let* ((articles
5735           ;; Select all articles if `read-all' is non-nil, or if there
5736           ;; are no unread articles.
5737           (if (or read-all
5738                   (and (zerop (length gnus-newsgroup-marked))
5739                        (zerop (length gnus-newsgroup-unreads)))
5740                   ;; Fetch all if the predicate is non-nil.
5741                   gnus-newsgroup-display)
5742               ;; We want to select the headers for all the articles in
5743               ;; the group, so we select either all the active
5744               ;; articles in the group, or (if that's nil), the
5745               ;; articles in the cache.
5746               (or
5747                (if gnus-newsgroup-maximum-articles
5748                    (let ((active (gnus-active group)))
5749                      (gnus-uncompress-range
5750                       (cons (max (car active)
5751                                  (- (cdr active)
5752                                     gnus-newsgroup-maximum-articles
5753                                     -1))
5754                             (cdr active))))
5755                  (gnus-uncompress-range (gnus-active group)))
5756                (gnus-cache-articles-in-group group))
5757             ;; Select only the "normal" subset of articles.
5758             (gnus-sorted-nunion
5759              (gnus-sorted-union gnus-newsgroup-dormant gnus-newsgroup-marked)
5760              gnus-newsgroup-unreads)))
5761          (scored-list (gnus-killed-articles gnus-newsgroup-killed articles))
5762          (scored (length scored-list))
5763          (number (length articles))
5764          (marked (+ (length gnus-newsgroup-marked)
5765                     (length gnus-newsgroup-dormant)))
5766          (select
5767           (cond
5768            ((numberp read-all)
5769             read-all)
5770            ((numberp gnus-newsgroup-display)
5771             gnus-newsgroup-display)
5772            (t
5773             (condition-case ()
5774                 (cond
5775                  ((and (or (<= scored marked) (= scored number))
5776                        (numberp gnus-large-newsgroup)
5777                        (> number gnus-large-newsgroup))
5778                   (let* ((cursor-in-echo-area nil)
5779                          (initial (gnus-parameter-large-newsgroup-initial
5780                                    gnus-newsgroup-name))
5781                          (input
5782                           (read-string
5783                            (format
5784                             "How many articles from %s (%s %d): "
5785                             (gnus-group-decoded-name gnus-newsgroup-name)
5786                             (if initial "max" "default")
5787                             number)
5788                            (if initial
5789                                (cons (number-to-string initial)
5790                                      0)))))
5791                     (if (string-match "^[ \t]*$" input) number input)))
5792                  ((and (> scored marked) (< scored number)
5793                        (> (- scored number) 20))
5794                   (let ((input
5795                          (read-string
5796                           (format "%s %s (%d scored, %d total): "
5797                                   "How many articles from"
5798                                   (gnus-group-decoded-name group)
5799                                   scored number))))
5800                     (if (string-match "^[ \t]*$" input)
5801                         number input)))
5802                  (t number))
5803               (quit
5804                (message "Quit getting the articles to read")
5805                nil))))))
5806     (setq select (if (stringp select) (string-to-number select) select))
5807     (if (or (null select) (zerop select))
5808         select
5809       (if (and (not (zerop scored)) (<= (abs select) scored))
5810           (progn
5811             (setq articles (sort scored-list '<))
5812             (setq number (length articles)))
5813         (setq articles (copy-sequence articles)))
5814
5815       (when (< (abs select) number)
5816         (if (< select 0)
5817             ;; Select the N oldest articles.
5818             (setcdr (nthcdr (1- (abs select)) articles) nil)
5819           ;; Select the N most recent articles.
5820           (setq articles (nthcdr (- number select) articles))))
5821       (setq gnus-newsgroup-unselected
5822             (gnus-sorted-difference gnus-newsgroup-unreads articles))
5823       (when gnus-alter-articles-to-read-function
5824         (setq articles
5825               (sort
5826                (funcall gnus-alter-articles-to-read-function
5827                         gnus-newsgroup-name articles)
5828                '<)))
5829       articles)))
5830
5831 (defun gnus-killed-articles (killed articles)
5832   (let (out)
5833     (while articles
5834       (when (inline (gnus-member-of-range (car articles) killed))
5835         (push (car articles) out))
5836       (setq articles (cdr articles)))
5837     out))
5838
5839 (defun gnus-uncompress-marks (marks)
5840   "Uncompress the mark ranges in MARKS."
5841   (let ((uncompressed '(score bookmark))
5842         out)
5843     (while marks
5844       (if (memq (caar marks) uncompressed)
5845           (push (car marks) out)
5846         (push (cons (caar marks) (gnus-uncompress-range (cdar marks))) out))
5847       (setq marks (cdr marks)))
5848     out))
5849
5850 (defun gnus-article-mark-to-type (mark)
5851   "Return the type of MARK."
5852   (or (cadr (assq mark gnus-article-special-mark-lists))
5853       'list))
5854
5855 (defun gnus-article-unpropagatable-p (mark)
5856   "Return whether MARK should be propagated to back end."
5857   (memq mark gnus-article-unpropagated-mark-lists))
5858
5859 (defun gnus-adjust-marked-articles (info)
5860   "Set all article lists and remove all marks that are no longer valid."
5861   (let* ((marked-lists (gnus-info-marks info))
5862          (active (gnus-active (gnus-info-group info)))
5863          (min (car active))
5864          (max (cdr active))
5865          (types gnus-article-mark-lists)
5866          marks var articles article mark mark-type
5867          bgn end)
5868     ;; Hack to avoid adjusting marks for imap.
5869     (when (eq (car (gnus-find-method-for-group (gnus-info-group info)))
5870               'nnimap)
5871       (setq min 1))
5872
5873     (dolist (marks marked-lists)
5874       (setq mark (car marks)
5875             mark-type (gnus-article-mark-to-type mark)
5876             var (intern (format "gnus-newsgroup-%s" (car (rassq mark types)))))
5877
5878       ;; We set the variable according to the type of the marks list,
5879       ;; and then adjust the marks to a subset of the active articles.
5880       (cond
5881        ;; Adjust "simple" lists - compressed yet unsorted
5882        ((eq mark-type 'list)
5883         ;; Simultaneously uncompress and clip to active range
5884         ;; See gnus-uncompress-range for a description of possible marks
5885         (let (l lh)
5886           (if (not (cadr marks))
5887               (set var nil)
5888             (setq articles (if (numberp (cddr marks))
5889                                (list (cdr marks))
5890                              (cdr marks))
5891                   lh (cons nil nil)
5892                   l lh)
5893
5894             (while (setq article (pop articles))
5895               (cond ((consp article)
5896                      (setq bgn (max (car article) min)
5897                            end (min (cdr article) max))
5898                      (while (<= bgn end)
5899                        (setq l (setcdr l (cons bgn nil))
5900                              bgn (1+ bgn))))
5901                     ((and (<= min article)
5902                           (>= max article))
5903                      (setq l (setcdr l (cons article nil))))))
5904             (set var (cdr lh)))))
5905        ;; Adjust assocs.
5906        ((eq mark-type 'tuple)
5907         (set var (setq articles (cdr marks)))
5908         (when (not (listp (cdr (symbol-value var))))
5909           (set var (list (symbol-value var))))
5910         (when (not (listp (cdr articles)))
5911           (setq articles (list articles)))
5912         (while articles
5913           (when (or (not (consp (setq article (pop articles))))
5914                     (< (car article) min)
5915                     (> (car article) max))
5916             (set var (delq article (symbol-value var))))))
5917        ;; Adjust ranges (sloppily).
5918        ((eq mark-type 'range)
5919         (cond
5920          ((eq mark 'seen)
5921           ;; Fix the record for `seen' if it looks like (seen NUM1 . NUM2).
5922           ;; It should be (seen (NUM1 . NUM2)).
5923           (when (numberp (cddr marks))
5924             (setcdr marks (list (cdr marks))))
5925           (setq articles (cdr marks))
5926           (while (and articles
5927                       (or (and (consp (car articles))
5928                                (> min (cdar articles)))
5929                           (and (numberp (car articles))
5930                                (> min (car articles)))))
5931             (pop articles))
5932           (set var articles))))))))
5933
5934 (defun gnus-update-missing-marks (missing)
5935   "Go through the list of MISSING articles and remove them from the mark lists."
5936   (when missing
5937     (let (var m)
5938       ;; Go through all types.
5939       (dolist (elem gnus-article-mark-lists)
5940         (when (eq (gnus-article-mark-to-type (cdr elem)) 'list)
5941           (setq var (intern (format "gnus-newsgroup-%s" (car elem))))
5942           (when (symbol-value var)
5943             ;; This list has articles.  So we delete all missing
5944             ;; articles from it.
5945             (setq m missing)
5946             (while m
5947               (set var (delq (pop m) (symbol-value var))))))))))
5948
5949 (defun gnus-update-marks ()
5950   "Enter the various lists of marked articles into the newsgroup info list."
5951   (let ((types gnus-article-mark-lists)
5952         (info (gnus-get-info gnus-newsgroup-name))
5953         type list newmarked symbol delta-marks)
5954     (when info
5955       ;; Add all marks lists to the list of marks lists.
5956       (while (setq type (pop types))
5957         (setq list (symbol-value
5958                     (setq symbol
5959                           (intern (format "gnus-newsgroup-%s" (car type))))))
5960
5961         (when list
5962           ;; Get rid of the entries of the articles that have the
5963           ;; default score.
5964           (when (and (eq (cdr type) 'score)
5965                      gnus-save-score
5966                      list)
5967             (let* ((arts list)
5968                    (prev (cons nil list))
5969                    (all prev))
5970               (while arts
5971                 (if (or (not (consp (car arts)))
5972                         (= (cdar arts) gnus-summary-default-score))
5973                     (setcdr prev (cdr arts))
5974                   (setq prev arts))
5975                 (setq arts (cdr arts)))
5976               (setq list (cdr all)))))
5977
5978         (when (eq (cdr type) 'seen)
5979           (setq list (gnus-range-add list gnus-newsgroup-unseen)))
5980
5981         (when (eq (gnus-article-mark-to-type (cdr type)) 'list)
5982           (setq list (gnus-compress-sequence (set symbol (sort list '<)) t)))
5983
5984         (when (and (gnus-check-backend-function
5985                     'request-set-mark gnus-newsgroup-name)
5986                    (not (gnus-article-unpropagatable-p (cdr type))))
5987           (let* ((old (cdr (assq (cdr type) (gnus-info-marks info))))
5988                  (del (gnus-remove-from-range (gnus-copy-sequence old) list))
5989                  (add (gnus-remove-from-range
5990                        (gnus-copy-sequence list) old)))
5991             (when add
5992               (push (list add 'add (list (cdr type))) delta-marks))
5993             (when del
5994               ;; Don't delete marks from outside the active range.  This
5995               ;; shouldn't happen, but is a sanity check.
5996               (setq del (gnus-sorted-range-intersection
5997                          (gnus-active gnus-newsgroup-name) del))
5998               (push (list del 'del (list (cdr type))) delta-marks))))
5999
6000         (when list
6001           (push (cons (cdr type) list) newmarked)))
6002
6003       (when delta-marks
6004         (unless (gnus-check-group gnus-newsgroup-name)
6005           (error "Can't open server for %s" gnus-newsgroup-name))
6006         (gnus-request-set-mark gnus-newsgroup-name delta-marks))
6007
6008       ;; Enter these new marks into the info of the group.
6009       (if (nthcdr 3 info)
6010           (setcar (nthcdr 3 info) newmarked)
6011         ;; Add the marks lists to the end of the info.
6012         (when newmarked
6013           (setcdr (nthcdr 2 info) (list newmarked))))
6014
6015       ;; Cut off the end of the info if there's nothing else there.
6016       (let ((i 5))
6017         (while (and (> i 2)
6018                     (not (nth i info)))
6019           (when (nthcdr (decf i) info)
6020             (setcdr (nthcdr i info) nil)))))))
6021
6022 (defun gnus-set-mode-line (where)
6023   "Set the mode line of the article or summary buffers.
6024 If WHERE is `summary', the summary mode line format will be used."
6025   ;; Is this mode line one we keep updated?
6026   (when (and (memq where gnus-updated-mode-lines)
6027              (symbol-value
6028               (intern (format "gnus-%s-mode-line-format-spec" where))))
6029     (let (mode-string)
6030       ;; We evaluate this in the summary buffer since these
6031       ;; variables are buffer-local to that buffer.
6032       (with-current-buffer gnus-summary-buffer
6033         ;; We bind all these variables that are used in the `eval' form
6034         ;; below.
6035         (let* ((mformat (symbol-value
6036                          (intern
6037                           (format "gnus-%s-mode-line-format-spec" where))))
6038                (gnus-tmp-group-name (gnus-mode-string-quote
6039                                      (gnus-group-decoded-name
6040                                       gnus-newsgroup-name)))
6041                (gnus-tmp-article-number (or gnus-current-article 0))
6042                (gnus-tmp-unread gnus-newsgroup-unreads)
6043                (gnus-tmp-unread-and-unticked (length gnus-newsgroup-unreads))
6044                (gnus-tmp-unselected (length gnus-newsgroup-unselected))
6045                (gnus-tmp-unread-and-unselected
6046                 (cond ((and (zerop gnus-tmp-unread-and-unticked)
6047                             (zerop gnus-tmp-unselected))
6048                        "")
6049                       ((zerop gnus-tmp-unselected)
6050                        (format "{%d more}" gnus-tmp-unread-and-unticked))
6051                       (t (format "{%d(+%d) more}"
6052                                  gnus-tmp-unread-and-unticked
6053                                  gnus-tmp-unselected))))
6054                (gnus-tmp-subject
6055                 (if (and gnus-current-headers
6056                          (vectorp gnus-current-headers))
6057                     (gnus-mode-string-quote
6058                      (mail-header-subject gnus-current-headers))
6059                   ""))
6060                bufname-length max-len
6061                gnus-tmp-header) ;; passed as argument to any user-format-funcs
6062           (setq mode-string (eval mformat))
6063           (setq bufname-length (if (string-match "%b" mode-string)
6064                                    (- (length
6065                                        (buffer-name
6066                                         (if (eq where 'summary)
6067                                             nil
6068                                           (get-buffer gnus-article-buffer))))
6069                                       2)
6070                                  0))
6071           (setq max-len (max 4 (if gnus-mode-non-string-length
6072                                    (- (window-width)
6073                                       gnus-mode-non-string-length
6074                                       bufname-length)
6075                                  (length mode-string))))
6076           ;; We might have to chop a bit of the string off...
6077           (when (> (length mode-string) max-len)
6078             (setq mode-string
6079                   (concat (truncate-string-to-width mode-string (- max-len 3))
6080                           "...")))))
6081       ;; Update the mode line.
6082       (setq mode-line-buffer-identification
6083             (gnus-mode-line-buffer-identification (list mode-string)))
6084       (set-buffer-modified-p t))))
6085
6086 (defun gnus-create-xref-hashtb (from-newsgroup headers unreads)
6087   "Go through the HEADERS list and add all Xrefs to a hash table.
6088 The resulting hash table is returned, or nil if no Xrefs were found."
6089   (let* ((virtual (gnus-virtual-group-p from-newsgroup))
6090          (prefix (if virtual "" (gnus-group-real-prefix from-newsgroup)))
6091          (xref-hashtb (gnus-make-hashtable))
6092          start group entry number xrefs header)
6093     (while headers
6094       (setq header (pop headers))
6095       (when (and (setq xrefs (mail-header-xref header))
6096                  (not (memq (setq number (mail-header-number header))
6097                             unreads)))
6098         (setq start 0)
6099         (while (string-match "\\([^ ]+\\)[:/]\\([0-9]+\\)" xrefs start)
6100           (setq start (match-end 0))
6101           (setq group (if prefix
6102                           (concat prefix (substring xrefs (match-beginning 1)
6103                                                     (match-end 1)))
6104                         (substring xrefs (match-beginning 1) (match-end 1))))
6105           (setq number
6106                 (string-to-number (substring xrefs (match-beginning 2)
6107                                           (match-end 2))))
6108           (if (setq entry (gnus-gethash group xref-hashtb))
6109               (setcdr entry (cons number (cdr entry)))
6110             (gnus-sethash group (cons number nil) xref-hashtb)))))
6111     (and start xref-hashtb)))
6112
6113 (defun gnus-mark-xrefs-as-read (from-newsgroup headers unreads)
6114   "Look through all the headers and mark the Xrefs as read."
6115   (let ((virtual (gnus-virtual-group-p from-newsgroup))
6116         name info xref-hashtb idlist method nth4)
6117     (with-current-buffer gnus-group-buffer
6118       (when (setq xref-hashtb
6119                   (gnus-create-xref-hashtb from-newsgroup headers unreads))
6120         (mapatoms
6121          (lambda (group)
6122            (unless (string= from-newsgroup (setq name (symbol-name group)))
6123              (setq idlist (symbol-value group))
6124              ;; Dead groups are not updated.
6125              (and (prog1
6126                       (setq info (gnus-get-info name))
6127                     (when (stringp (setq nth4 (gnus-info-method info)))
6128                       (setq nth4 (gnus-server-to-method nth4))))
6129                   ;; Only do the xrefs if the group has the same
6130                   ;; select method as the group we have just read.
6131                   (or (gnus-methods-equal-p
6132                        nth4 (gnus-find-method-for-group from-newsgroup))
6133                       virtual
6134                       (equal nth4 (setq method (gnus-find-method-for-group
6135                                                 from-newsgroup)))
6136                       (and (equal (car nth4) (car method))
6137                            (equal (nth 1 nth4) (nth 1 method))))
6138                   gnus-use-cross-reference
6139                   (or (not (eq gnus-use-cross-reference t))
6140                       virtual
6141                       ;; Only do cross-references on subscribed
6142                       ;; groups, if that is what is wanted.
6143                       (<= (gnus-info-level info) gnus-level-subscribed))
6144                   (gnus-group-make-articles-read name idlist))))
6145          xref-hashtb)))))
6146
6147 (defun gnus-compute-read-articles (group articles)
6148   (let* ((entry (gnus-group-entry group))
6149          (info (nth 2 entry))
6150          (active (gnus-active group))
6151          ninfo)
6152     (when entry
6153       ;; First peel off all invalid article numbers.
6154       (when active
6155         (let ((ids articles)
6156               id first)
6157           (while (setq id (pop ids))
6158             (when (and first (> id (cdr active)))
6159               ;; We'll end up in this situation in one particular
6160               ;; obscure situation.  If you re-scan a group and get
6161               ;; a new article that is cross-posted to a different
6162               ;; group that has not been re-scanned, you might get
6163               ;; crossposted article that has a higher number than
6164               ;; Gnus believes possible.  So we re-activate this
6165               ;; group as well.  This might mean doing the
6166               ;; crossposting thingy will *increase* the number
6167               ;; of articles in some groups.  Tsk, tsk.
6168               (setq active (or (gnus-activate-group group) active)))
6169             (when (or (> id (cdr active))
6170                       (< id (car active)))
6171               (setq articles (delq id articles))))))
6172       ;; If the read list is nil, we init it.
6173       (if (and active
6174                (null (gnus-info-read info))
6175                (> (car active) 1))
6176           (setq ninfo (cons 1 (1- (car active))))
6177         (setq ninfo (gnus-info-read info)))
6178       ;; Then we add the read articles to the range.
6179       (gnus-add-to-range
6180        ninfo (setq articles (sort articles '<))))))
6181
6182 (defun gnus-group-make-articles-read (group articles)
6183   "Update the info of GROUP to say that ARTICLES are read."
6184   (let* ((num 0)
6185          (entry (gnus-group-entry group))
6186          (info (nth 2 entry))
6187          (active (gnus-active group))
6188          range)
6189     (if (not entry)
6190         ;; Group that Gnus doesn't know exists, but still allow the
6191         ;; backend to set marks.
6192         (gnus-request-set-mark
6193          group (list (list (gnus-compress-sequence (sort articles #'<))
6194                            'add '(read))))
6195       ;; Normal, subscribed groups.
6196       (setq range (gnus-compute-read-articles group articles))
6197       (with-current-buffer gnus-group-buffer
6198         (gnus-undo-register
6199           `(progn
6200              (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
6201              (gnus-info-set-read ',info ',(gnus-info-read info))
6202              (gnus-get-unread-articles-in-group ',info (gnus-active ,group))
6203              (gnus-request-set-mark ,group (list (list ',range 'del '(read))))
6204              (gnus-group-update-group ,group t))))
6205       ;; Add the read articles to the range.
6206       (gnus-info-set-read info range)
6207       (gnus-request-set-mark group (list (list range 'add '(read))))
6208       ;; Then we have to re-compute how many unread
6209       ;; articles there are in this group.
6210       (when active
6211         (cond
6212          ((not range)
6213           (setq num (- (1+ (cdr active)) (car active))))
6214          ((not (listp (cdr range)))
6215           (setq num (- (cdr active) (- (1+ (cdr range))
6216                                        (car range)))))
6217          (t
6218           (while range
6219             (if (numberp (car range))
6220                 (setq num (1+ num))
6221               (setq num (+ num (- (1+ (cdar range)) (caar range)))))
6222             (setq range (cdr range)))
6223           (setq num (- (cdr active) num))))
6224         ;; Update the number of unread articles.
6225         (setcar entry num)
6226         ;; Update the group buffer.
6227         (unless (gnus-ephemeral-group-p group)
6228           (gnus-group-update-group group t))))))
6229
6230 (defun gnus-get-newsgroup-headers (&optional dependencies force-new)
6231   (let ((cur nntp-server-buffer)
6232         (dependencies
6233          (or dependencies
6234              (with-current-buffer gnus-summary-buffer
6235                gnus-newsgroup-dependencies)))
6236         headers id end ref number
6237         (mail-parse-charset gnus-newsgroup-charset)
6238         (mail-parse-ignored-charsets
6239          (save-current-buffer (condition-case nil
6240                                   (set-buffer gnus-summary-buffer)
6241                                 (error))
6242                               gnus-newsgroup-ignored-charsets)))
6243     (with-current-buffer nntp-server-buffer
6244       ;; Translate all TAB characters into SPACE characters.
6245       (subst-char-in-region (point-min) (point-max) ?\t ?  t)
6246       (subst-char-in-region (point-min) (point-max) ?\r ?  t)
6247       (ietf-drums-unfold-fws)
6248       (gnus-run-hooks 'gnus-parse-headers-hook)
6249       (let ((case-fold-search t)
6250             in-reply-to header p lines chars)
6251         (goto-char (point-min))
6252         ;; Search to the beginning of the next header.  Error messages
6253         ;; do not begin with 2 or 3.
6254         (while (re-search-forward "^[23][0-9]+ " nil t)
6255           (setq id nil
6256                 ref nil)
6257           ;; This implementation of this function, with nine
6258           ;; search-forwards instead of the one re-search-forward and
6259           ;; a case (which basically was the old function) is actually
6260           ;; about twice as fast, even though it looks messier.  You
6261           ;; can't have everything, I guess.  Speed and elegance
6262           ;; doesn't always go hand in hand.
6263           (setq
6264            header
6265            (vector
6266             ;; Number.
6267             (prog1
6268                 (setq number (read cur))
6269               (end-of-line)
6270               (setq p (point))
6271               (narrow-to-region (point)
6272                                 (or (and (search-forward "\n.\n" nil t)
6273                                          (- (point) 2))
6274                                     (point))))
6275             ;; Subject.
6276             (progn
6277               (goto-char p)
6278               (if (search-forward "\nsubject:" nil t)
6279                   (funcall gnus-decode-encoded-word-function
6280                            (nnheader-header-value))
6281                 "(none)"))
6282             ;; From.
6283             (progn
6284               (goto-char p)
6285               (if (search-forward "\nfrom:" nil t)
6286                   (funcall gnus-decode-encoded-address-function
6287                            (nnheader-header-value))
6288                 "(nobody)"))
6289             ;; Date.
6290             (progn
6291               (goto-char p)
6292               (if (search-forward "\ndate:" nil t)
6293                   (nnheader-header-value) ""))
6294             ;; Message-ID.
6295             (progn
6296               (goto-char p)
6297               (setq id (if (re-search-forward
6298                             "^message-id: *\\(<[^\n\t> ]+>\\)" nil t)
6299                            ;; We do it this way to make sure the Message-ID
6300                            ;; is (somewhat) syntactically valid.
6301                            (buffer-substring (match-beginning 1)
6302                                              (match-end 1))
6303                          ;; If there was no message-id, we just fake one
6304                          ;; to make subsequent routines simpler.
6305                          (nnheader-generate-fake-message-id number))))
6306             ;; References.
6307             (progn
6308               (goto-char p)
6309               (if (search-forward "\nreferences:" nil t)
6310                   (progn
6311                     (setq end (point))
6312                     (prog1
6313                         (nnheader-header-value)
6314                       (setq ref
6315                             (buffer-substring
6316                              (progn
6317                                (end-of-line)
6318                                (search-backward ">" end t)
6319                                (1+ (point)))
6320                              (progn
6321                                (search-backward "<" end t)
6322                                (point))))))
6323                 ;; Get the references from the in-reply-to header if there
6324                 ;; were no references and the in-reply-to header looks
6325                 ;; promising.
6326                 (if (and (search-forward "\nin-reply-to:" nil t)
6327                          (setq in-reply-to (nnheader-header-value))
6328                          (string-match "<[^>]+>" in-reply-to))
6329                     (let (ref2)
6330                       (setq ref (substring in-reply-to (match-beginning 0)
6331                                            (match-end 0)))
6332                       (while (string-match "<[^>]+>" in-reply-to (match-end 0))
6333                         (setq ref2 (substring in-reply-to (match-beginning 0)
6334                                               (match-end 0)))
6335                         (when (> (length ref2) (length ref))
6336                           (setq ref ref2)))
6337                       ref)
6338                   (setq ref nil))))
6339             ;; Chars.
6340             (progn
6341               (goto-char p)
6342               (if (search-forward "\nchars: " nil t)
6343                   (if (numberp (setq chars (ignore-errors (read cur))))
6344                       chars -1)
6345                 -1))
6346             ;; Lines.
6347             (progn
6348               (goto-char p)
6349               (if (search-forward "\nlines: " nil t)
6350                   (if (numberp (setq lines (ignore-errors (read cur))))
6351                       lines -1)
6352                 -1))
6353             ;; Xref.
6354             (progn
6355               (goto-char p)
6356               (and (search-forward "\nxref:" nil t)
6357                    (nnheader-header-value)))
6358             ;; Extra.
6359             (when gnus-extra-headers
6360               (let ((extra gnus-extra-headers)
6361                     out)
6362                 (while extra
6363                   (goto-char p)
6364                   (when (search-forward
6365                          (concat "\n" (symbol-name (car extra)) ":") nil t)
6366                     (push (cons (car extra) (nnheader-header-value))
6367                           out))
6368                   (pop extra))
6369                 out))))
6370           (when (equal id ref)
6371             (setq ref nil))
6372
6373           (when gnus-alter-header-function
6374             (funcall gnus-alter-header-function header)
6375             (setq id (mail-header-id header)
6376                   ref (gnus-parent-id (mail-header-references header))))
6377
6378           (when (setq header
6379                       (gnus-dependencies-add-header
6380                        header dependencies force-new))
6381             (push header headers))
6382           (goto-char (point-max))
6383           (widen))
6384         (nreverse headers)))))
6385
6386 ;; Goes through the xover lines and returns a list of vectors
6387 (defun gnus-get-newsgroup-headers-xover (sequence &optional
6388                                                   force-new dependencies
6389                                                   group also-fetch-heads)
6390   "Parse the news overview data in the server buffer.
6391 Return a list of headers that match SEQUENCE (see
6392 `nntp-retrieve-headers')."
6393   ;; Get the Xref when the users reads the articles since most/some
6394   ;; NNTP servers do not include Xrefs when using XOVER.
6395   (setq gnus-article-internal-prepare-hook '(gnus-article-get-xrefs))
6396   (let ((mail-parse-charset gnus-newsgroup-charset)
6397         (mail-parse-ignored-charsets gnus-newsgroup-ignored-charsets)
6398         (cur nntp-server-buffer)
6399         (dependencies (or dependencies gnus-newsgroup-dependencies))
6400         (allp (cond
6401                ((eq gnus-read-all-available-headers t)
6402                 t)
6403                ((and (stringp gnus-read-all-available-headers)
6404                      group)
6405                 (string-match gnus-read-all-available-headers group))
6406                (t
6407                 nil)))
6408         number headers header)
6409     (with-current-buffer nntp-server-buffer
6410       (subst-char-in-region (point-min) (point-max) ?\r ?  t)
6411       ;; Allow the user to mangle the headers before parsing them.
6412       (gnus-run-hooks 'gnus-parse-headers-hook)
6413       (goto-char (point-min))
6414       (gnus-parse-without-error
6415         (while (and (or sequence allp)
6416                     (not (eobp)))
6417           (setq number (read cur))
6418           (when (not allp)
6419             (while (and sequence
6420                         (< (car sequence) number))
6421               (setq sequence (cdr sequence))))
6422           (when (and (or allp
6423                          (and sequence
6424                               (eq number (car sequence))))
6425                      (progn
6426                        (setq sequence (cdr sequence))
6427                        (setq header (inline
6428                                       (gnus-nov-parse-line
6429                                        number dependencies force-new)))))
6430             (push header headers))
6431           (forward-line 1)))
6432       ;; A common bug in inn is that if you have posted an article and
6433       ;; then retrieves the active file, it will answer correctly --
6434       ;; the new article is included.  However, a NOV entry for the
6435       ;; article may not have been generated yet, so this may fail.
6436       ;; We work around this problem by retrieving the last few
6437       ;; headers using HEAD.
6438       (if (or (not also-fetch-heads)
6439               (not sequence))
6440           ;; We (probably) got all the headers.
6441           (nreverse headers)
6442         (let ((gnus-nov-is-evil t))
6443           (nconc
6444            (nreverse headers)
6445            (when (eq (gnus-retrieve-headers sequence group) 'headers)
6446              (gnus-get-newsgroup-headers))))))))
6447
6448 (defun gnus-article-get-xrefs ()
6449   "Fill in the Xref value in `gnus-current-headers', if necessary.
6450 This is meant to be called in `gnus-article-internal-prepare-hook'."
6451   (let ((headers (with-current-buffer gnus-summary-buffer
6452                    gnus-current-headers)))
6453     (or (not gnus-use-cross-reference)
6454         (not headers)
6455         (and (mail-header-xref headers)
6456              (not (string= (mail-header-xref headers) "")))
6457         (let ((case-fold-search t)
6458               xref)
6459           (save-restriction
6460             (nnheader-narrow-to-headers)
6461             (goto-char (point-min))
6462             (when (or (and (not (eobp))
6463                            (eq (downcase (char-after)) ?x)
6464                            (looking-at "Xref:"))
6465                       (search-forward "\nXref:" nil t))
6466               (goto-char (1+ (match-end 0)))
6467               (setq xref (buffer-substring (point) (point-at-eol)))
6468               (mail-header-set-xref headers xref)))))))
6469
6470 (defun gnus-summary-insert-subject (id &optional old-header use-old-header)
6471   "Find article ID and insert the summary line for that article.
6472 OLD-HEADER can either be a header or a line number to insert
6473 the subject line on."
6474   (let* ((line (and (numberp old-header) old-header))
6475          (old-header (and (vectorp old-header) old-header))
6476          (header (cond ((and old-header use-old-header)
6477                         old-header)
6478                        ((and (numberp id)
6479                              (gnus-number-to-header id))
6480                         (gnus-number-to-header id))
6481                        (t
6482                         (gnus-read-header id))))
6483          (number (and (numberp id) id))
6484          d)
6485     (when header
6486       ;; Rebuild the thread that this article is part of and go to the
6487       ;; article we have fetched.
6488       (when (and (not gnus-show-threads)
6489                  old-header)
6490         (when (and number
6491                    (setq d (gnus-data-find (mail-header-number old-header))))
6492           (goto-char (gnus-data-pos d))
6493           (gnus-data-remove
6494            number
6495            (- (point-at-bol)
6496               (prog1
6497                   (1+ (point-at-eol))
6498                 (gnus-delete-line))))))
6499       ;; Remove list identifiers from subject.
6500       (when gnus-list-identifiers
6501         (let ((gnus-newsgroup-headers (list header)))
6502           (gnus-summary-remove-list-identifiers)))
6503       (when old-header
6504         (mail-header-set-number header (mail-header-number old-header)))
6505       (setq gnus-newsgroup-sparse
6506             (delq (setq number (mail-header-number header))
6507                   gnus-newsgroup-sparse))
6508       (setq gnus-newsgroup-ancient (delq number gnus-newsgroup-ancient))
6509       (push number gnus-newsgroup-limit)
6510       (gnus-rebuild-thread (mail-header-id header) line)
6511       (gnus-summary-goto-subject number nil t))
6512     (when (and (numberp number)
6513                (> number 0))
6514       ;; We have to update the boundaries even if we can't fetch the
6515       ;; article if ID is a number -- so that the next `P' or `N'
6516       ;; command will fetch the previous (or next) article even
6517       ;; if the one we tried to fetch this time has been canceled.
6518       (when (> number gnus-newsgroup-end)
6519         (setq gnus-newsgroup-end number))
6520       (when (< number gnus-newsgroup-begin)
6521         (setq gnus-newsgroup-begin number))
6522       (setq gnus-newsgroup-unselected
6523             (delq number gnus-newsgroup-unselected)))
6524     ;; Report back a success?
6525     (and header (mail-header-number header))))
6526
6527 ;;; Process/prefix in the summary buffer
6528
6529 (defun gnus-summary-work-articles (n)
6530   "Return a list of articles to be worked upon.
6531 The prefix argument, the list of process marked articles, and the
6532 current article will be taken into consideration."
6533   (with-current-buffer gnus-summary-buffer
6534     (cond
6535      (n
6536       ;; A numerical prefix has been given.
6537       (setq n (prefix-numeric-value n))
6538       (let ((backward (< n 0))
6539             (n (abs (prefix-numeric-value n)))
6540             articles article)
6541         (save-excursion
6542           (while
6543               (and (> n 0)
6544                    (push (setq article (gnus-summary-article-number))
6545                          articles)
6546                    (if backward
6547                        (gnus-summary-find-prev nil article)
6548                      (gnus-summary-find-next nil article)))
6549             (decf n)))
6550         (nreverse articles)))
6551      ((and (gnus-region-active-p) (mark))
6552       (message "region active")
6553       ;; Work on the region between point and mark.
6554       (let ((max (max (point) (mark)))
6555             articles article)
6556         (save-excursion
6557           (goto-char (min (point) (mark)))
6558           (while
6559               (and
6560                (push (setq article (gnus-summary-article-number)) articles)
6561                (gnus-summary-find-next nil article)
6562                (< (point) max)))
6563           (nreverse articles))))
6564      (gnus-newsgroup-processable
6565       ;; There are process-marked articles present.
6566       ;; Save current state.
6567       (gnus-summary-save-process-mark)
6568       ;; Return the list.
6569       (reverse gnus-newsgroup-processable))
6570      (t
6571       ;; Just return the current article.
6572       (list (gnus-summary-article-number))))))
6573
6574 (defmacro gnus-summary-iterate (arg &rest forms)
6575   "Iterate over the process/prefixed articles and do FORMS.
6576 ARG is the interactive prefix given to the command.  FORMS will be
6577 executed with point over the summary line of the articles."
6578   (let ((articles (make-symbol "gnus-summary-iterate-articles")))
6579     `(let ((,articles (gnus-summary-work-articles ,arg)))
6580        (while ,articles
6581          (gnus-summary-goto-subject (car ,articles))
6582          ,@forms
6583          (pop ,articles)))))
6584
6585 (put 'gnus-summary-iterate 'lisp-indent-function 1)
6586 (put 'gnus-summary-iterate 'edebug-form-spec '(form body))
6587
6588 (defun gnus-summary-save-process-mark ()
6589   "Push the current set of process marked articles on the stack."
6590   (interactive)
6591   (push (copy-sequence gnus-newsgroup-processable)
6592         gnus-newsgroup-process-stack))
6593
6594 (defun gnus-summary-kill-process-mark ()
6595   "Push the current set of process marked articles on the stack and unmark."
6596   (interactive)
6597   (gnus-summary-save-process-mark)
6598   (gnus-summary-unmark-all-processable))
6599
6600 (defun gnus-summary-yank-process-mark ()
6601   "Pop the last process mark state off the stack and restore it."
6602   (interactive)
6603   (unless gnus-newsgroup-process-stack
6604     (error "Empty mark stack"))
6605   (gnus-summary-process-mark-set (pop gnus-newsgroup-process-stack)))
6606
6607 (defun gnus-summary-process-mark-set (set)
6608   "Make SET into the current process marked articles."
6609   (gnus-summary-unmark-all-processable)
6610   (mapc 'gnus-summary-set-process-mark set))
6611
6612 ;;; Searching and stuff
6613
6614 (defun gnus-summary-search-group (&optional backward use-level)
6615   "Search for next unread newsgroup.
6616 If optional argument BACKWARD is non-nil, search backward instead."
6617   (with-current-buffer gnus-group-buffer
6618     (when (gnus-group-search-forward
6619            backward nil (if use-level (gnus-group-group-level) nil))
6620       (gnus-group-group-name))))
6621
6622 (defun gnus-summary-best-group (&optional exclude-group)
6623   "Find the name of the best unread group.
6624 If EXCLUDE-GROUP, do not go to this group."
6625   (with-current-buffer gnus-group-buffer
6626     (save-excursion
6627       (gnus-group-best-unread-group exclude-group))))
6628
6629 (defun gnus-summary-find-next (&optional unread article backward)
6630   (if backward
6631       (gnus-summary-find-prev unread article)
6632     (let* ((dummy (gnus-summary-article-intangible-p))
6633            (article (or article (gnus-summary-article-number)))
6634            (data (gnus-data-find-list article))
6635            result)
6636       (when (and (not dummy)
6637                  (or (not gnus-summary-check-current)
6638                      (not unread)
6639                      (not (gnus-data-unread-p (car data)))))
6640         (setq data (cdr data)))
6641       (when (setq result
6642                   (if unread
6643                       (progn
6644                         (while data
6645                           (unless (memq (gnus-data-number (car data))
6646                                         (cond
6647                                          ((eq gnus-auto-goto-ignores
6648                                               'always-undownloaded)
6649                                           gnus-newsgroup-undownloaded)
6650                                          (gnus-plugged
6651                                           nil)
6652                                          ((eq gnus-auto-goto-ignores
6653                                               'unfetched)
6654                                           gnus-newsgroup-unfetched)
6655                                          ((eq gnus-auto-goto-ignores
6656                                               'undownloaded)
6657                                           gnus-newsgroup-undownloaded)))
6658                             (when (gnus-data-unread-p (car data))
6659                               (setq result (car data)
6660                                     data nil)))
6661                           (setq data (cdr data)))
6662                         result)
6663                     (car data)))
6664         (goto-char (gnus-data-pos result))
6665         (gnus-data-number result)))))
6666
6667 (defun gnus-summary-find-prev (&optional unread article)
6668   (let* ((eobp (eobp))
6669          (article (or article (gnus-summary-article-number)))
6670          (data (gnus-data-find-list article (gnus-data-list 'rev)))
6671          result)
6672     (when (and (not eobp)
6673                (or (not gnus-summary-check-current)
6674                    (not unread)
6675                    (not (gnus-data-unread-p (car data)))))
6676       (setq data (cdr data)))
6677     (when (setq result
6678                 (if unread
6679                     (progn
6680                       (while data
6681                         (unless (memq (gnus-data-number (car data))
6682                                       (cond
6683                                        ((eq gnus-auto-goto-ignores
6684                                             'always-undownloaded)
6685                                         gnus-newsgroup-undownloaded)
6686                                        (gnus-plugged
6687                                         nil)
6688                                        ((eq gnus-auto-goto-ignores
6689                                             'unfetched)
6690                                         gnus-newsgroup-unfetched)
6691                                        ((eq gnus-auto-goto-ignores
6692                                             'undownloaded)
6693                                         gnus-newsgroup-undownloaded)))
6694                           (when (gnus-data-unread-p (car data))
6695                             (setq result (car data)
6696                                   data nil)))
6697                         (setq data (cdr data)))
6698                       result)
6699                   (car data)))
6700       (goto-char (gnus-data-pos result))
6701       (gnus-data-number result))))
6702
6703 (defun gnus-summary-find-subject (subject &optional unread backward article)
6704   (let* ((simp-subject (gnus-simplify-subject-fully subject))
6705          (article (or article (gnus-summary-article-number)))
6706          (articles (gnus-data-list backward))
6707          (arts (gnus-data-find-list article articles))
6708          result)
6709     (when (or (not gnus-summary-check-current)
6710               (not unread)
6711               (not (gnus-data-unread-p (car arts))))
6712       (setq arts (cdr arts)))
6713     (while arts
6714       (and (or (not unread)
6715                (gnus-data-unread-p (car arts)))
6716            (vectorp (gnus-data-header (car arts)))
6717            (gnus-subject-equal
6718             simp-subject (mail-header-subject (gnus-data-header (car arts))) t)
6719            (setq result (car arts)
6720                  arts nil))
6721       (setq arts (cdr arts)))
6722     (and result
6723          (goto-char (gnus-data-pos result))
6724          (gnus-data-number result))))
6725
6726 (defun gnus-summary-search-forward (&optional unread subject backward)
6727   "Search forward for an article.
6728 If UNREAD, look for unread articles.  If SUBJECT, look for
6729 articles with that subject.  If BACKWARD, search backward instead."
6730   (cond (subject (gnus-summary-find-subject subject unread backward))
6731         (backward (gnus-summary-find-prev unread))
6732         (t (gnus-summary-find-next unread))))
6733
6734 (defun gnus-recenter (&optional n)
6735   "Center point in window and redisplay frame.
6736 Also do horizontal recentering."
6737   (interactive "P")
6738   (when (and gnus-auto-center-summary
6739              (not (eq gnus-auto-center-summary 'vertical)))
6740     (gnus-horizontal-recenter))
6741   (if (fboundp 'recenter-top-bottom)
6742       (recenter-top-bottom n)
6743     (recenter n)))
6744
6745 (put 'gnus-recenter 'isearch-scroll t)
6746
6747 (defun gnus-forward-line-ignore-invisible (n)
6748   "Move N lines forward (backward if N is negative).
6749 Like forward-line, but skip over (and don't count) invisible lines."
6750   (let (done)
6751     (while (and (> n 0) (not done))
6752       ;; If the following character is currently invisible,
6753       ;; skip all characters with that same `invisible' property value.
6754       (while (gnus-invisible-p (point))
6755         (goto-char (gnus-next-char-property-change (point))))
6756       (forward-line 1)
6757       (if (eobp)
6758           (setq done t)
6759         (setq n (1- n))))
6760     (while (and (< n 0) (not done))
6761       (forward-line -1)
6762       (if (bobp) (setq done t)
6763         (setq n (1+ n))
6764         (while (and (not (bobp)) (gnus-invisible-p (1- (point))))
6765           (goto-char (gnus-previous-char-property-change (point))))))))
6766
6767 (defun gnus-summary-recenter ()
6768   "Center point in the summary window.
6769 If `gnus-auto-center-summary' is nil, or the article buffer isn't
6770 displayed, no centering will be performed."
6771   ;; Suggested by earle@mahendo.JPL.NASA.GOV (Greg Earle).
6772   ;; Recenter only when requested.  Suggested by popovich@park.cs.columbia.edu.
6773   (interactive)
6774   ;; The user has to want it.
6775   (when gnus-auto-center-summary
6776     (let* ((top (cond ((< (window-height) 4) 0)
6777                       ((< (window-height) 7) 1)
6778                       (t (if (numberp gnus-auto-center-summary)
6779                              gnus-auto-center-summary
6780                            (/ (1- (window-height)) 2)))))
6781            (height (1- (window-height)))
6782            (bottom (save-excursion
6783                      (goto-char (point-max))
6784                      (gnus-forward-line-ignore-invisible (- height))
6785                      (point)))
6786            (window (get-buffer-window (current-buffer))))
6787       (when (get-buffer-window gnus-article-buffer)
6788         ;; Only do recentering when the article buffer is displayed,
6789         ;; Set the window start to either `bottom', which is the biggest
6790         ;; possible valid number, or the second line from the top,
6791         ;; whichever is the least.
6792         (let ((top-pos (save-excursion
6793                          (gnus-forward-line-ignore-invisible (- top))
6794                          (point))))
6795           (if (> bottom top-pos)
6796               ;; Keep the second line from the top visible
6797               (set-window-start window top-pos)
6798             ;; Try to keep the bottom line visible; if it's partially
6799             ;; obscured, either scroll one more line to make it fully
6800             ;; visible, or revert to using TOP-POS.
6801             (save-excursion
6802               (goto-char (point-max))
6803               (gnus-forward-line-ignore-invisible -1)
6804               (let ((last-line-start (point)))
6805                 (goto-char bottom)
6806                 (set-window-start window (point) t)
6807                 (when (not (pos-visible-in-window-p last-line-start window))
6808                   (gnus-forward-line-ignore-invisible 1)
6809                   (set-window-start window (min (point) top-pos) t)))))))
6810       ;; Do horizontal recentering while we're at it.
6811       (when (and (get-buffer-window (current-buffer) t)
6812                  (not (eq gnus-auto-center-summary 'vertical)))
6813         (let ((selected (selected-window)))
6814           (select-window (get-buffer-window (current-buffer) t))
6815           (gnus-summary-position-point)
6816           (gnus-horizontal-recenter)
6817           (select-window selected))))))
6818
6819 (defun gnus-summary-jump-to-group (newsgroup)
6820   "Move point to NEWSGROUP in group mode buffer."
6821   ;; Keep update point of group mode buffer if visible.
6822   (if (eq (current-buffer) (get-buffer gnus-group-buffer))
6823       (save-window-excursion
6824         ;; Take care of tree window mode.
6825         (when (get-buffer-window gnus-group-buffer)
6826           (pop-to-buffer gnus-group-buffer))
6827         (gnus-group-jump-to-group newsgroup))
6828     (save-excursion
6829       ;; Take care of tree window mode.
6830       (if (get-buffer-window gnus-group-buffer 0)
6831           (pop-to-buffer gnus-group-buffer)
6832         (set-buffer gnus-group-buffer))
6833       (gnus-group-jump-to-group newsgroup))))
6834
6835 ;; This function returns a list of article numbers based on the
6836 ;; difference between the ranges of read articles in this group and
6837 ;; the range of active articles.
6838 (defun gnus-list-of-unread-articles (group)
6839   (let* ((read (gnus-info-read (gnus-get-info group)))
6840          (active (or (gnus-active group) (gnus-activate-group group)))
6841          (last (or (cdr active)
6842                    (error "Group %s couldn't be activated " group)))
6843          (bottom (if gnus-newsgroup-maximum-articles
6844                      (max (car active)
6845                           (- last gnus-newsgroup-maximum-articles -1))
6846                    (car active)))
6847          first nlast unread)
6848     ;; If none are read, then all are unread.
6849     (if (not read)
6850         (setq first bottom)
6851       ;; If the range of read articles is a single range, then the
6852       ;; first unread article is the article after the last read
6853       ;; article.  Sounds logical, doesn't it?
6854       (if (and (not (listp (cdr read)))
6855                (or (< (car read) bottom)
6856                    (progn (setq read (list read))
6857                           nil)))
6858           (setq first (max bottom (1+ (cdr read))))
6859         ;; `read' is a list of ranges.
6860         (when (/= (setq nlast (or (and (numberp (car read)) (car read))
6861                                   (caar read)))
6862                   1)
6863           (setq first bottom))
6864         (while read
6865           (when first
6866             (while (< first nlast)
6867               (setq unread (cons first unread)
6868                     first (1+ first))))
6869           (setq first (1+ (if (atom (car read)) (car read) (cdar read))))
6870           (setq nlast (if (atom (cadr read)) (cadr read) (caadr read)))
6871           (setq read (cdr read)))))
6872     ;; And add the last unread articles.
6873     (while (<= first last)
6874       (setq unread (cons first unread)
6875             first (1+ first)))
6876     ;; Return the list of unread articles.
6877     (delq 0 (nreverse unread))))
6878
6879 (defun gnus-list-of-read-articles (group)
6880   "Return a list of unread, unticked and non-dormant articles."
6881   (let* ((info (gnus-get-info group))
6882          (marked (gnus-info-marks info))
6883          (active (gnus-active group)))
6884     (and info active
6885          (gnus-list-range-difference
6886           (gnus-list-range-difference
6887            (gnus-sorted-complement
6888             (gnus-uncompress-range
6889              (if gnus-newsgroup-maximum-articles
6890                  (cons (max (car active)
6891                             (- (cdr active)
6892                                gnus-newsgroup-maximum-articles
6893                                -1))
6894                        (cdr active))
6895                active))
6896             (gnus-list-of-unread-articles group))
6897            (cdr (assq 'dormant marked)))
6898           (cdr (assq 'tick marked))))))
6899
6900 ;; This function returns a sequence of article numbers based on the
6901 ;; difference between the ranges of read articles in this group and
6902 ;; the range of active articles.
6903 (defun gnus-sequence-of-unread-articles (group)
6904   (let* ((read (gnus-info-read (gnus-get-info group)))
6905          (active (or (gnus-active group) (gnus-activate-group group)))
6906          (last (cdr active))
6907          (bottom (if gnus-newsgroup-maximum-articles
6908                      (max (car active)
6909                           (- last gnus-newsgroup-maximum-articles -1))
6910                    (car active)))
6911          first nlast unread)
6912     ;; If none are read, then all are unread.
6913     (if (not read)
6914         (setq first bottom)
6915       ;; If the range of read articles is a single range, then the
6916       ;; first unread article is the article after the last read
6917       ;; article.  Sounds logical, doesn't it?
6918       (if (and (not (listp (cdr read)))
6919                (or (< (car read) bottom)
6920                    (progn (setq read (list read))
6921                           nil)))
6922           (setq first (max bottom (1+ (cdr read))))
6923         ;; `read' is a list of ranges.
6924         (when (/= (setq nlast (or (and (numberp (car read)) (car read))
6925                                   (caar read)))
6926                   1)
6927           (setq first bottom))
6928         (while read
6929           (when first
6930             (push (cons first nlast) unread))
6931           (setq first (1+ (if (atom (car read)) (car read) (cdar read))))
6932           (setq nlast (if (atom (cadr read)) (cadr read) (caadr read)))
6933           (setq read (cdr read)))))
6934     ;; And add the last unread articles.
6935     (cond ((not (and first last))
6936            nil)
6937           ((< first last)
6938            (push (cons first last) unread))
6939           ((= first last)
6940            (push first unread)))
6941     ;; Return the sequence of unread articles.
6942     (delq 0 (nreverse unread))))
6943
6944 ;; Various summary commands
6945
6946 (defun gnus-summary-select-article-buffer ()
6947   "Reconfigure windows to show the article buffer.
6948 If `gnus-widen-article-buffer' is set, show only the article
6949 buffer."
6950   (interactive)
6951   (if (not (gnus-buffer-live-p gnus-article-buffer))
6952       (error "There is no article buffer for this summary buffer")
6953     (unless (get-buffer-window gnus-article-buffer)
6954       (gnus-summary-show-article))
6955     (gnus-configure-windows
6956      (if gnus-widen-article-window
6957          'only-article
6958        'article)
6959      t)
6960     (select-window (get-buffer-window gnus-article-buffer))))
6961
6962 (defun gnus-summary-universal-argument (arg)
6963   "Perform any operation on all articles that are process/prefixed."
6964   (interactive "P")
6965   (let ((articles (gnus-summary-work-articles arg))
6966         func article)
6967     (if (eq
6968          (setq
6969           func
6970           (key-binding
6971            (read-key-sequence
6972             (substitute-command-keys
6973              "\\<gnus-summary-mode-map>\\[gnus-summary-universal-argument]"))))
6974          'undefined)
6975         (gnus-error 1 "Undefined key")
6976       (save-excursion
6977         (while articles
6978           (gnus-summary-goto-subject (setq article (pop articles)))
6979           (let (gnus-newsgroup-processable)
6980             (command-execute func))
6981           (gnus-summary-remove-process-mark article)))))
6982   (gnus-summary-position-point))
6983
6984 (defun gnus-summary-toggle-truncation (&optional arg)
6985   "Toggle truncation of summary lines.
6986 With ARG, turn line truncation on if ARG is positive."
6987   (interactive "P")
6988   (setq truncate-lines
6989         (if (null arg) (not truncate-lines)
6990           (> (prefix-numeric-value arg) 0)))
6991   (redraw-display))
6992
6993 (defun gnus-summary-find-for-reselect ()
6994   "Return the number of an article to stay on across a reselect.
6995 The current article is considered, then following articles, then previous
6996 articles.  An article is sought which is not cancelled and isn't a temporary
6997 insertion from another group.  If there's no such then return a dummy 0."
6998   (let (found)
6999     (dolist (rev '(nil t))
7000       (unless found      ; don't demand the reverse list if we don't need it
7001         (let ((data (gnus-data-find-list
7002                      (gnus-summary-article-number) (gnus-data-list rev))))
7003           (while (and data (not found))
7004             (if (and (< 0 (gnus-data-number (car data)))
7005                      (not (eq gnus-canceled-mark (gnus-data-mark (car data)))))
7006                 (setq found (gnus-data-number (car data))))
7007             (setq data (cdr data))))))
7008     (or found 0)))
7009
7010 (defun gnus-summary-reselect-current-group (&optional all rescan)
7011   "Exit and then reselect the current newsgroup.
7012 The prefix argument ALL means to select all articles."
7013   (interactive "P")
7014   (when (gnus-ephemeral-group-p gnus-newsgroup-name)
7015     (error "Ephemeral groups can't be reselected"))
7016   (let ((current-subject (gnus-summary-find-for-reselect))
7017         (group gnus-newsgroup-name))
7018     (setq gnus-newsgroup-begin nil)
7019     (gnus-summary-exit nil 'leave-hidden)
7020     ;; We have to adjust the point of group mode buffer because
7021     ;; point was moved to the next unread newsgroup by exiting.
7022     (gnus-summary-jump-to-group group)
7023     (when rescan
7024       (save-excursion
7025         (gnus-group-get-new-news-this-group 1)))
7026     (gnus-group-read-group all t)
7027     (gnus-summary-goto-subject current-subject nil t)))
7028
7029 (defun gnus-summary-rescan-group (&optional all)
7030   "Exit the newsgroup, ask for new articles, and select the newsgroup."
7031   (interactive "P")
7032   (let ((config gnus-current-window-configuration))
7033     (gnus-summary-reselect-current-group all t)
7034     (gnus-configure-windows config)
7035     (when (eq config 'article)
7036       (gnus-summary-select-article))))
7037
7038 (defun gnus-summary-update-info (&optional non-destructive)
7039   (save-excursion
7040     (let ((group gnus-newsgroup-name))
7041       (when group
7042         (when gnus-newsgroup-kill-headers
7043           (setq gnus-newsgroup-killed
7044                 (gnus-compress-sequence
7045                  (gnus-sorted-union
7046                   (gnus-list-range-intersection
7047                    gnus-newsgroup-unselected gnus-newsgroup-killed)
7048                   gnus-newsgroup-unreads)
7049                  t)))
7050         (unless (listp (cdr gnus-newsgroup-killed))
7051           (setq gnus-newsgroup-killed (list gnus-newsgroup-killed)))
7052         (let ((headers gnus-newsgroup-headers))
7053           ;; Set the new ranges of read articles.
7054           (with-current-buffer gnus-group-buffer
7055             (gnus-undo-force-boundary))
7056           (gnus-update-read-articles
7057            group (gnus-sorted-union
7058                   gnus-newsgroup-unreads gnus-newsgroup-unselected))
7059           ;; Set the current article marks.
7060           (let ((gnus-newsgroup-scored
7061                  (if (and (not gnus-save-score)
7062                           (not non-destructive))
7063                      nil
7064                    gnus-newsgroup-scored)))
7065             (save-excursion
7066               (gnus-update-marks)))
7067           ;; Do the cross-ref thing.
7068           (when gnus-use-cross-reference
7069             (gnus-mark-xrefs-as-read group headers gnus-newsgroup-unreads))
7070           ;; Do not switch windows but change the buffer to work.
7071           (set-buffer gnus-group-buffer)
7072           (unless (gnus-ephemeral-group-p group)
7073             (gnus-group-update-group group)))))))
7074
7075 (defun gnus-summary-save-newsrc (&optional force)
7076   "Save the current number of read/marked articles in the dribble buffer.
7077 The dribble buffer will then be saved.
7078 If FORCE (the prefix), also save the .newsrc file(s)."
7079   (interactive "P")
7080   (gnus-summary-update-info t)
7081   (if force
7082       (gnus-save-newsrc-file)
7083     (gnus-dribble-save)))
7084
7085 (declare-function gnus-cache-write-active "gnus-cache" (&optional force))
7086
7087 (defun gnus-summary-exit (&optional temporary leave-hidden)
7088   "Exit reading current newsgroup, and then return to group selection mode.
7089 `gnus-exit-group-hook' is called with no arguments if that value is non-nil."
7090   (interactive)
7091   (gnus-set-global-variables)
7092   (when (gnus-buffer-live-p gnus-article-buffer)
7093     (with-current-buffer gnus-article-buffer
7094       (mm-destroy-parts gnus-article-mime-handles)
7095       ;; Set it to nil for safety reason.
7096       (setq gnus-article-mime-handle-alist nil)
7097       (setq gnus-article-mime-handles nil)))
7098   (gnus-kill-save-kill-buffer)
7099   (gnus-async-halt-prefetch)
7100   (let* ((group gnus-newsgroup-name)
7101          (quit-config (gnus-group-quit-config gnus-newsgroup-name))
7102          (gnus-group-is-exiting-p t)
7103          (mode major-mode)
7104          (group-point nil)
7105          (buf (current-buffer)))
7106     (unless quit-config
7107       ;; Do adaptive scoring, and possibly save score files.
7108       (when gnus-newsgroup-adaptive
7109         (gnus-score-adaptive))
7110       (when gnus-use-scoring
7111         (gnus-score-save)))
7112     (gnus-run-hooks 'gnus-summary-prepare-exit-hook)
7113     (when gnus-use-cache
7114       (gnus-cache-possibly-remove-articles)
7115       (gnus-cache-save-buffers))
7116     (gnus-async-prefetch-remove-group group)
7117     (when gnus-suppress-duplicates
7118       (gnus-dup-enter-articles))
7119     (when gnus-use-trees
7120       (gnus-tree-close group))
7121     (when gnus-use-cache
7122       (gnus-cache-write-active))
7123     ;; Remove entries for this group.
7124     (nnmail-purge-split-history (gnus-group-real-name group))
7125     ;; Make all changes in this group permanent.
7126     (unless quit-config
7127       (gnus-run-hooks 'gnus-exit-group-hook)
7128       (gnus-summary-update-info))
7129     (gnus-close-group group)
7130     ;; Make sure where we were, and go to next newsgroup.
7131     (set-buffer gnus-group-buffer)
7132     (unless quit-config
7133       (gnus-group-jump-to-group group))
7134     (gnus-run-hooks 'gnus-summary-exit-hook)
7135     (unless (or quit-config
7136                 (not gnus-summary-next-group-on-exit)
7137                 ;; If this group has disappeared from the summary
7138                 ;; buffer, don't skip forwards.
7139                 (not (string= group (gnus-group-group-name))))
7140       (gnus-group-next-unread-group 1))
7141     (setq group-point (point))
7142     (if temporary
7143         nil                             ;Nothing to do.
7144       (set-buffer buf)
7145       (if (not gnus-kill-summary-on-exit)
7146           (progn
7147             (gnus-deaden-summary)
7148             (setq mode nil))
7149         (when (get-buffer gnus-article-buffer)
7150           (bury-buffer gnus-article-buffer))
7151         ;; Return to group mode buffer.
7152         (when (eq mode 'gnus-summary-mode)
7153           (gnus-kill-buffer buf)))
7154
7155       ;; If we have several article buffers, we kill them at exit.
7156       (unless gnus-single-article-buffer
7157         (when (gnus-buffer-live-p gnus-article-buffer)
7158           (with-current-buffer gnus-article-buffer
7159             ;; Don't kill sticky article buffers
7160             (unless (eq major-mode 'gnus-sticky-article-mode)
7161               (gnus-kill-buffer gnus-article-buffer)
7162               (setq gnus-article-current nil))))
7163         (gnus-kill-buffer gnus-original-article-buffer))
7164
7165       (setq gnus-current-select-method gnus-select-method)
7166       (set-buffer gnus-group-buffer)
7167       (if quit-config
7168           (gnus-handle-ephemeral-exit quit-config)
7169         (goto-char group-point)
7170         ;; If gnus-group-buffer is already displayed, make sure we also move
7171         ;; the cursor in the window that displays it.
7172         (let ((win (get-buffer-window (current-buffer) 0)))
7173           (if win (set-window-point win (point))))
7174         (unless leave-hidden
7175           (gnus-configure-windows 'group 'force)))
7176       ;; Clear the current group name.
7177       (unless quit-config
7178         (setq gnus-newsgroup-name nil)))))
7179
7180 (defalias 'gnus-summary-quit 'gnus-summary-exit-no-update)
7181 (defun gnus-summary-exit-no-update (&optional no-questions)
7182   "Quit reading current newsgroup without updating read article info."
7183   (interactive)
7184   (let* ((group gnus-newsgroup-name)
7185          (gnus-group-is-exiting-p t)
7186          (gnus-group-is-exiting-without-update-p t)
7187          (quit-config (gnus-group-quit-config group)))
7188     (when (or no-questions
7189               gnus-expert-user
7190               (gnus-y-or-n-p "Discard changes to this group and exit? "))
7191       (gnus-async-halt-prefetch)
7192       (run-hooks 'gnus-summary-prepare-exit-hook)
7193       (when (gnus-buffer-live-p gnus-article-buffer)
7194         (with-current-buffer gnus-article-buffer
7195           (mm-destroy-parts gnus-article-mime-handles)
7196           ;; Set it to nil for safety reason.
7197           (setq gnus-article-mime-handle-alist nil)
7198           (setq gnus-article-mime-handles nil)))
7199       ;; If we have several article buffers, we kill them at exit.
7200       (unless gnus-single-article-buffer
7201         (gnus-kill-buffer gnus-article-buffer)
7202         (gnus-kill-buffer gnus-original-article-buffer)
7203         (setq gnus-article-current nil))
7204       (if (not gnus-kill-summary-on-exit)
7205           (gnus-deaden-summary)
7206         (gnus-close-group group)
7207         (gnus-kill-buffer gnus-summary-buffer))
7208       (unless gnus-single-article-buffer
7209         (setq gnus-article-current nil))
7210       (when gnus-use-trees
7211         (gnus-tree-close group))
7212       (gnus-async-prefetch-remove-group group)
7213       (when (get-buffer gnus-article-buffer)
7214         (bury-buffer gnus-article-buffer))
7215       ;; Return to the group buffer.
7216       (gnus-configure-windows 'group 'force)
7217       ;; Clear the current group name.
7218       (setq gnus-newsgroup-name nil)
7219       (unless (gnus-ephemeral-group-p group)
7220         (gnus-group-update-group group))
7221       (when (equal (gnus-group-group-name) group)
7222         (gnus-group-next-unread-group 1))
7223       (when quit-config
7224         (gnus-handle-ephemeral-exit quit-config)))))
7225
7226 (defun gnus-handle-ephemeral-exit (quit-config)
7227   "Handle movement when leaving an ephemeral group.
7228 The state which existed when entering the ephemeral is reset."
7229   (if (not (buffer-name (car quit-config)))
7230       (gnus-configure-windows 'group 'force)
7231     (set-buffer (car quit-config))
7232     (cond ((eq major-mode 'gnus-summary-mode)
7233            (gnus-set-global-variables))
7234           ((eq major-mode 'gnus-article-mode)
7235            (save-current-buffer
7236              ;; The `gnus-summary-buffer' variable may point
7237              ;; to the old summary buffer when using a single
7238              ;; article buffer.
7239              (unless (gnus-buffer-live-p gnus-summary-buffer)
7240                (set-buffer gnus-group-buffer))
7241              (set-buffer gnus-summary-buffer)
7242              (gnus-set-global-variables))))
7243     (if (or (eq (cdr quit-config) 'article)
7244             (eq (cdr quit-config) 'pick))
7245         (if (and (boundp 'gnus-pick-mode) (symbol-value 'gnus-pick-mode))
7246             (gnus-configure-windows 'pick 'force)
7247           (gnus-configure-windows (cdr quit-config) 'force))
7248       (gnus-configure-windows (cdr quit-config) 'force))
7249     (when (eq major-mode 'gnus-summary-mode)
7250       (if (memq gnus-auto-select-on-ephemeral-exit '(next-noselect
7251                                                      next-unread-noselect))
7252           (when (zerop (cond ((eq gnus-auto-select-on-ephemeral-exit
7253                                   'next-noselect)
7254                               (gnus-summary-next-subject 1 nil t))
7255                              ((eq gnus-auto-select-on-ephemeral-exit
7256                                   'next-unread-noselect)
7257                               (gnus-summary-next-subject 1 t t))))
7258             ;; Hide the article buffer which displays the article different
7259             ;; from the one that the cursor points to in the summary buffer.
7260             (gnus-configure-windows 'summary 'force))
7261         (cond ((eq gnus-auto-select-on-ephemeral-exit 'next)
7262                (gnus-summary-next-subject 1))
7263               ((eq gnus-auto-select-on-ephemeral-exit 'next-unread)
7264                (gnus-summary-next-subject 1 t))))
7265       (gnus-summary-recenter)
7266       (gnus-summary-position-point))))
7267
7268 ;;; Dead summaries.
7269
7270 (defvar gnus-dead-summary-mode-map
7271   (let ((map (make-keymap)))
7272     (suppress-keymap map)
7273     (substitute-key-definition 'undefined 'gnus-summary-wake-up-the-dead map)
7274     (dolist (key '("\C-d" "\r" "\177" [delete]))
7275       (define-key map key 'gnus-summary-wake-up-the-dead))
7276     (dolist (key '("q" "Q"))
7277       (define-key map key 'bury-buffer))
7278     map))
7279
7280 (define-minor-mode gnus-dead-summary-mode
7281   "Minor mode for Gnus summary buffers."
7282   :lighter " Dead" :keymap gnus-dead-summary-mode-map
7283   (unless (derived-mode-p 'gnus-summary-mode)
7284     (setq gnus-dead-summary-mode nil)))
7285
7286 (defun gnus-deaden-summary ()
7287   "Make the current summary buffer into a dead summary buffer."
7288   ;; Kill any previous dead summary buffer.
7289   (when (and gnus-dead-summary
7290              (buffer-name gnus-dead-summary))
7291     (with-current-buffer gnus-dead-summary
7292       (when gnus-dead-summary-mode
7293         (kill-buffer (current-buffer)))))
7294   ;; Make this the current dead summary.
7295   (setq gnus-dead-summary (current-buffer))
7296   (gnus-dead-summary-mode 1)
7297   (let ((name (buffer-name)))
7298     (when (string-match "Summary" name)
7299       (rename-buffer
7300        (concat (substring name 0 (match-beginning 0)) "Dead "
7301                (substring name (match-beginning 0)))
7302        t)
7303       (bury-buffer))))
7304
7305 (defun gnus-kill-or-deaden-summary (buffer)
7306   "Kill or deaden the summary BUFFER."
7307   (save-excursion
7308     (when (and (buffer-name buffer)
7309                (not gnus-single-article-buffer))
7310       (with-current-buffer buffer
7311         (gnus-kill-buffer gnus-article-buffer)
7312         (gnus-kill-buffer gnus-original-article-buffer)))
7313     (cond
7314      ;; Kill the buffer.
7315      (gnus-kill-summary-on-exit
7316       (when (and gnus-use-trees
7317                  (gnus-buffer-exists-p buffer))
7318         (with-current-buffer buffer
7319           (gnus-tree-close gnus-newsgroup-name)))
7320       (gnus-kill-buffer buffer))
7321      ;; Deaden the buffer.
7322      ((gnus-buffer-exists-p buffer)
7323       (with-current-buffer buffer
7324         (gnus-deaden-summary))))))
7325
7326 (defun gnus-summary-wake-up-the-dead (&rest args)
7327   "Wake up the dead summary buffer."
7328   (interactive)
7329   (gnus-dead-summary-mode -1)
7330   (let ((name (buffer-name)))
7331     (when (string-match "Dead " name)
7332       (rename-buffer
7333        (concat (substring name 0 (match-beginning 0))
7334                (substring name (match-end 0)))
7335        t)))
7336   (gnus-message 3 "This dead summary is now alive again"))
7337
7338 ;; Suggested by Per Abrahamsen <amanda@iesd.auc.dk>.
7339 (defun gnus-summary-describe-group (&optional force)
7340   "Describe the current newsgroup."
7341   (interactive "P")
7342   (gnus-group-describe-group force gnus-newsgroup-name))
7343
7344 (defun gnus-summary-describe-briefly ()
7345   "Describe summary mode commands briefly."
7346   (interactive)
7347   (gnus-message 6 "%s" (substitute-command-keys "\\<gnus-summary-mode-map>\\[gnus-summary-next-page]:Select  \\[gnus-summary-next-unread-article]:Forward  \\[gnus-summary-prev-unread-article]:Backward  \\[gnus-summary-exit]:Exit  \\[gnus-info-find-node]:Run Info   \\[gnus-summary-describe-briefly]:This help")))
7348
7349 ;; Walking around group mode buffer from summary mode.
7350
7351 (defun gnus-summary-next-group (&optional no-article target-group backward)
7352   "Exit current newsgroup and then select next unread newsgroup.
7353 If prefix argument NO-ARTICLE is non-nil, no article is selected
7354 initially.  If TARGET-GROUP, go to this group.  If BACKWARD, go to
7355 previous group instead."
7356   (interactive "P")
7357   ;; Stop pre-fetching.
7358   (gnus-async-halt-prefetch)
7359   (let ((current-group gnus-newsgroup-name)
7360         (current-buffer (current-buffer))
7361         entered)
7362     ;; First we semi-exit this group to update Xrefs and all variables.
7363     ;; We can't do a real exit, because the window conf must remain
7364     ;; the same in case the user is prompted for info, and we don't
7365     ;; want the window conf to change before that...
7366     (gnus-summary-exit t)
7367     (while (not entered)
7368       ;; Then we find what group we are supposed to enter.
7369       (set-buffer gnus-group-buffer)
7370       (gnus-group-jump-to-group current-group)
7371       (setq target-group
7372             (or target-group
7373                 (if (eq gnus-keep-same-level 'best)
7374                     (gnus-summary-best-group gnus-newsgroup-name)
7375                   (gnus-summary-search-group backward gnus-keep-same-level))))
7376       (if (not target-group)
7377           ;; There are no further groups, so we return to the group
7378           ;; buffer.
7379           (progn
7380             (gnus-message 5 "Returning to the group buffer")
7381             (setq entered t)
7382             (when (gnus-buffer-live-p current-buffer)
7383               (set-buffer current-buffer)
7384               (gnus-summary-exit))
7385             (gnus-run-hooks 'gnus-group-no-more-groups-hook))
7386         ;; We try to enter the target group.
7387         (gnus-group-jump-to-group target-group)
7388         (let ((unreads (gnus-group-group-unread)))
7389           (if (and (or (eq t unreads)
7390                        (and unreads (not (zerop unreads))))
7391                    (gnus-summary-read-group
7392                     target-group nil no-article
7393                     (and (buffer-name current-buffer) current-buffer)
7394                     nil backward))
7395               (setq entered t)
7396             (setq current-group target-group
7397                   target-group nil)))))))
7398
7399 (defun gnus-summary-prev-group (&optional no-article)
7400   "Exit current newsgroup and then select previous unread newsgroup.
7401 If prefix argument NO-ARTICLE is non-nil, no article is selected initially."
7402   (interactive "P")
7403   (gnus-summary-next-group no-article nil t))
7404
7405 ;; Walking around summary lines.
7406
7407 (defun gnus-summary-first-subject (&optional unread undownloaded unseen)
7408   "Go to the first subject satisfying any non-nil constraint.
7409 If UNREAD is non-nil, the article should be unread.
7410 If UNDOWNLOADED is non-nil, the article should be undownloaded.
7411 If UNSEEN is non-nil, the article should be unseen as well as unread.
7412 Returns the article selected or nil if there are no matching articles."
7413   (interactive "P")
7414   (cond
7415    ;; Empty summary.
7416    ((null gnus-newsgroup-data)
7417     (gnus-message 3 "No articles in the group")
7418     nil)
7419    ;; Pick the first article.
7420    ((not (or unread undownloaded unseen))
7421     (goto-char (gnus-data-pos (car gnus-newsgroup-data)))
7422     (gnus-data-number (car gnus-newsgroup-data)))
7423    ;; Find the first unread article.
7424    (t
7425     (let ((data gnus-newsgroup-data))
7426       (while (and data
7427                   (let ((num (gnus-data-number (car data))))
7428                     (or (memq num gnus-newsgroup-unfetched)
7429                         (not (or (and unread
7430                                       (memq num gnus-newsgroup-unreads))
7431                                  (and undownloaded
7432                                       (memq num gnus-newsgroup-undownloaded))
7433                                  (and unseen
7434                                       (memq num gnus-newsgroup-unseen)
7435                                       (memq num gnus-newsgroup-unreads)))))))
7436         (setq data (cdr data)))
7437       (prog1
7438           (if data
7439               (progn
7440                 (goto-char (gnus-data-pos (car data)))
7441                 (gnus-data-number (car data)))
7442             (gnus-message 3 "No more%s articles"
7443                           (let* ((r (when unread " unread"))
7444                                  (d (when undownloaded " undownloaded"))
7445                                  (s (when unseen " unseen"))
7446                                  (l (delq nil (list r d s))))
7447                             (cond ((= 3 (length l))
7448                                    (concat r "," d ", or" s))
7449                                   ((= 2 (length l))
7450                                    (concat (car l) ", or" (cadr l)))
7451                                   ((= 1 (length l))
7452                                    (car l))
7453                                   (t
7454                                    ""))))
7455             nil
7456             )
7457         (gnus-summary-position-point))))))
7458
7459 (defun gnus-summary-next-subject (n &optional unread dont-display)
7460   "Go to next N'th summary line.
7461 If N is negative, go to the previous N'th subject line.
7462 If UNREAD is non-nil, only unread articles are selected.
7463 The difference between N and the actual number of steps taken is
7464 returned."
7465   (interactive "p")
7466   (let ((backward (< n 0))
7467         (n (abs n)))
7468     (while (and (> n 0)
7469                 (if backward
7470                     (gnus-summary-find-prev unread)
7471                   (gnus-summary-find-next unread)))
7472       (unless (zerop (setq n (1- n)))
7473         (gnus-summary-show-thread)))
7474     (when (/= 0 n)
7475       (gnus-message 7 "No more%s articles"
7476                     (if unread " unread" "")))
7477     (unless dont-display
7478       (gnus-summary-recenter)
7479       (gnus-summary-position-point))
7480     n))
7481
7482 (defun gnus-summary-next-unread-subject (n)
7483   "Go to next N'th unread summary line."
7484   (interactive "p")
7485   (gnus-summary-next-subject n t))
7486
7487 (defun gnus-summary-prev-subject (n &optional unread)
7488   "Go to previous N'th summary line.
7489 If optional argument UNREAD is non-nil, only unread article is selected."
7490   (interactive "p")
7491   (gnus-summary-next-subject (- n) unread))
7492
7493 (defun gnus-summary-prev-unread-subject (n)
7494   "Go to previous N'th unread summary line."
7495   (interactive "p")
7496   (gnus-summary-next-subject (- n) t))
7497
7498 (defun gnus-summary-goto-subjects (articles)
7499   "Insert the subject header for ARTICLES in the current buffer."
7500   (save-excursion
7501     (dolist (article articles)
7502       (gnus-summary-goto-subject article t)))
7503   (gnus-summary-limit (append articles gnus-newsgroup-limit))
7504   (gnus-summary-position-point))
7505
7506 (defun gnus-summary-goto-subject (article &optional force silent)
7507   "Go to the subject line of ARTICLE.
7508 If FORCE, also allow jumping to articles not currently shown."
7509   (interactive "nArticle number: ")
7510   (unless (numberp article)
7511     (error "Article %s is not a number" article))
7512   (let ((b (point))
7513         (data (gnus-data-find article)))
7514     ;; We read in the article if we have to.
7515     (and (not data)
7516          force
7517          (gnus-summary-insert-subject
7518           article
7519           (if (or (numberp force) (vectorp force)) force)
7520           t)
7521          (setq data (gnus-data-find article)))
7522     (goto-char b)
7523     (if (not data)
7524         (progn
7525           (unless silent
7526             (gnus-message 3 "Can't find article %d" article))
7527           nil)
7528       (let ((pt (gnus-data-pos data)))
7529         (goto-char pt)
7530         (gnus-summary-set-article-display-arrow pt))
7531       (gnus-summary-position-point)
7532       article)))
7533
7534 ;; Walking around summary lines with displaying articles.
7535
7536 (defun gnus-summary-expand-window (&optional arg)
7537   "Make the summary buffer take up the entire Emacs frame.
7538 Given a prefix, will force an `article' buffer configuration."
7539   (interactive "P")
7540   (if arg
7541       (gnus-configure-windows 'article 'force)
7542     (gnus-configure-windows 'summary 'force)))
7543
7544 (defun gnus-summary-display-article (article &optional all-header)
7545   "Display ARTICLE in article buffer."
7546   (unless (and (gnus-buffer-live-p gnus-article-buffer)
7547                (with-current-buffer gnus-article-buffer
7548                  (eq major-mode 'gnus-article-mode)))
7549     (gnus-article-setup-buffer))
7550   (gnus-set-global-variables)
7551   (with-current-buffer gnus-article-buffer
7552     (setq gnus-article-charset gnus-newsgroup-charset)
7553     (setq gnus-article-ignored-charsets gnus-newsgroup-ignored-charsets)
7554     (mm-enable-multibyte))
7555   (if (null article)
7556       nil
7557     (prog1
7558         (if gnus-summary-display-article-function
7559             (funcall gnus-summary-display-article-function article all-header)
7560           (gnus-article-prepare article all-header))
7561       (gnus-run-hooks 'gnus-select-article-hook)
7562       (when (and gnus-current-article
7563                  (not (zerop gnus-current-article)))
7564         (gnus-summary-goto-subject gnus-current-article))
7565       (gnus-summary-recenter)
7566       (when (and gnus-use-trees gnus-show-threads)
7567         (gnus-possibly-generate-tree article)
7568         (gnus-highlight-selected-tree article))
7569       ;; Successfully display article.
7570       (gnus-article-set-window-start
7571        (cdr (assq article gnus-newsgroup-bookmarks))))))
7572
7573 (defun gnus-summary-select-article (&optional all-headers force pseudo article)
7574   "Select the current article.
7575 If ALL-HEADERS is non-nil, show all header fields.  If FORCE is
7576 non-nil, the article will be re-fetched even if it already present in
7577 the article buffer.  If PSEUDO is non-nil, pseudo-articles will also
7578 be displayed."
7579   ;; Make sure we are in the summary buffer to work around bbdb bug.
7580   (unless (eq major-mode 'gnus-summary-mode)
7581     (set-buffer gnus-summary-buffer))
7582   (let ((article (or article (gnus-summary-article-number)))
7583         (all-headers (not (not all-headers))) ;Must be t or nil.
7584         gnus-summary-display-article-function)
7585     (and (not pseudo)
7586          (gnus-summary-article-pseudo-p article)
7587          (error "This is a pseudo-article"))
7588     (with-current-buffer gnus-summary-buffer
7589       (if (or (and gnus-single-article-buffer
7590                    (or (null gnus-current-article)
7591                        (null gnus-article-current)
7592                        (null (get-buffer gnus-article-buffer))
7593                        (not (eq article (cdr gnus-article-current)))
7594                        (not (equal (car gnus-article-current)
7595                                    gnus-newsgroup-name))
7596                        (not (get-buffer gnus-original-article-buffer))))
7597               (and (not gnus-single-article-buffer)
7598                    (or (null gnus-current-article)
7599                        (not (get-buffer gnus-original-article-buffer))
7600                        (not (eq gnus-current-article article))))
7601               force)
7602           ;; The requested article is different from the current article.
7603           (progn
7604             (gnus-summary-display-article article all-headers)
7605             (when (gnus-buffer-live-p gnus-article-buffer)
7606               (with-current-buffer gnus-article-buffer
7607                 (if (not gnus-article-decoded-p) ;; a local variable
7608                     (mm-disable-multibyte))))
7609             (gnus-article-set-window-start
7610              (cdr (assq article gnus-newsgroup-bookmarks)))
7611             article)
7612         'old))))
7613
7614 (defun gnus-summary-force-verify-and-decrypt ()
7615   "Display buttons for signed/encrypted parts and verify/decrypt them."
7616   (interactive)
7617   (let ((mm-verify-option 'known)
7618         (mm-decrypt-option 'known)
7619         (gnus-article-emulate-mime t)
7620         (gnus-buttonized-mime-types (append (list "multipart/signed"
7621                                                   "multipart/encrypted")
7622                                             gnus-buttonized-mime-types)))
7623     (gnus-summary-select-article nil 'force)))
7624
7625 (defun gnus-summary-set-current-mark (&optional current-mark)
7626   "Obsolete function."
7627   nil)
7628
7629 (defun gnus-summary-next-article (&optional unread subject backward push)
7630   "Select the next article.
7631 If UNREAD, only unread articles are selected.
7632 If SUBJECT, only articles with SUBJECT are selected.
7633 If BACKWARD, the previous article is selected instead of the next."
7634   (interactive "P")
7635   ;; Make sure we are in the summary buffer.
7636   (unless (eq major-mode 'gnus-summary-mode)
7637     (set-buffer gnus-summary-buffer))
7638   (cond
7639    ;; Is there such an article?
7640    ((and (gnus-summary-search-forward unread subject backward)
7641          (or (gnus-summary-display-article (gnus-summary-article-number))
7642              (eq (gnus-summary-article-mark) gnus-canceled-mark)))
7643     (gnus-summary-position-point))
7644    ;; If not, we try the first unread, if that is wanted.
7645    ((and subject
7646          gnus-auto-select-same
7647          (gnus-summary-first-unread-article))
7648     (gnus-summary-position-point)
7649     (gnus-message 6 "Wrapped"))
7650    ;; Try to get next/previous article not displayed in this group.
7651    ((and gnus-auto-extend-newsgroup
7652          (not unread) (not subject))
7653     (gnus-summary-goto-article
7654      (if backward (1- gnus-newsgroup-begin) (1+ gnus-newsgroup-end))
7655      nil (count-lines (point-min) (point))))
7656    ;; Go to next/previous group.
7657    (t
7658     (unless (gnus-ephemeral-group-p gnus-newsgroup-name)
7659       (gnus-summary-jump-to-group gnus-newsgroup-name))
7660     (let ((cmd (if (featurep 'xemacs)
7661                    last-command-char
7662                  last-command-event))
7663           (point
7664            (with-current-buffer gnus-group-buffer
7665              (point)))
7666           (group
7667            (if (eq gnus-keep-same-level 'best)
7668                (gnus-summary-best-group gnus-newsgroup-name)
7669              (gnus-summary-search-group backward gnus-keep-same-level))))
7670       ;; For some reason, the group window gets selected.  We change
7671       ;; it back.
7672       (select-window (get-buffer-window (current-buffer)))
7673       ;; Select next unread newsgroup automagically.
7674       (cond
7675        ((or (not gnus-auto-select-next)
7676             (not cmd))
7677         (gnus-message 7 "No more%s articles" (if unread " unread" "")))
7678        ((or (eq gnus-auto-select-next 'quietly)
7679             (and (eq gnus-auto-select-next 'slightly-quietly)
7680                  push)
7681             (and (eq gnus-auto-select-next 'almost-quietly)
7682                  (gnus-summary-last-article-p)))
7683         ;; Select quietly.
7684         (if (gnus-ephemeral-group-p gnus-newsgroup-name)
7685             (gnus-summary-exit)
7686           (gnus-message 7 "No more%s articles (%s)..."
7687                         (if unread " unread" "")
7688                         (if group (concat "selecting " group)
7689                           "exiting"))
7690           (gnus-summary-next-group nil group backward)))
7691        (t
7692         (when (gnus-key-press-event-p last-input-event)
7693           (gnus-summary-walk-group-buffer
7694            gnus-newsgroup-name cmd unread backward point))))))))
7695
7696 (defun gnus-summary-walk-group-buffer (from-group cmd unread backward start)
7697   (let ((keystrokes '((?\C-n (gnus-group-next-unread-group 1))
7698                       (?\C-p (gnus-group-prev-unread-group 1))))
7699         (cursor-in-echo-area t)
7700         keve key group ended prompt)
7701     (with-current-buffer gnus-group-buffer
7702       (goto-char start)
7703       (setq group
7704             (if (eq gnus-keep-same-level 'best)
7705                 (gnus-summary-best-group gnus-newsgroup-name)
7706               (gnus-summary-search-group backward gnus-keep-same-level))))
7707     (while (not ended)
7708       (setq prompt
7709             (format
7710              "No more%s articles%s " (if unread " unread" "")
7711              (if (and group
7712                       (not (gnus-ephemeral-group-p gnus-newsgroup-name)))
7713                  (format " (Type %s for %s [%s])"
7714                          (single-key-description cmd)
7715                          (gnus-group-decoded-name group)
7716                          (gnus-group-unread group))
7717                (format " (Type %s to exit %s)"
7718                        (single-key-description cmd)
7719                        (gnus-group-decoded-name gnus-newsgroup-name)))))
7720       ;; Confirm auto selection.
7721       (setq key (car (setq keve (gnus-read-event-char prompt)))
7722             ended t)
7723       (cond
7724        ((assq key keystrokes)
7725         (let ((obuf (current-buffer)))
7726           (switch-to-buffer gnus-group-buffer)
7727           (when group
7728             (gnus-group-jump-to-group group))
7729           (eval (cadr (assq key keystrokes)))
7730           (setq group (gnus-group-group-name))
7731           (switch-to-buffer obuf))
7732         (setq ended nil))
7733        ((equal key cmd)
7734         (if (or (not group)
7735                 (gnus-ephemeral-group-p gnus-newsgroup-name))
7736             (gnus-summary-exit)
7737           (gnus-summary-next-group nil group backward)))
7738        (t
7739         (push (cdr keve) unread-command-events))))))
7740
7741 (defun gnus-summary-next-unread-article ()
7742   "Select unread article after current one."
7743   (interactive)
7744   (gnus-summary-next-article
7745    (or (not (eq gnus-summary-goto-unread 'never))
7746        (gnus-summary-last-article-p (gnus-summary-article-number)))
7747    (and gnus-auto-select-same
7748         (gnus-summary-article-subject))))
7749
7750 (defun gnus-summary-prev-article (&optional unread subject)
7751   "Select the article before the current one.
7752 If UNREAD is non-nil, only unread articles are selected."
7753   (interactive "P")
7754   (gnus-summary-next-article unread subject t))
7755
7756 (defun gnus-summary-prev-unread-article ()
7757   "Select unread article before current one."
7758   (interactive)
7759   (gnus-summary-prev-article
7760    (or (not (eq gnus-summary-goto-unread 'never))
7761        (gnus-summary-first-article-p (gnus-summary-article-number)))
7762    (and gnus-auto-select-same
7763         (gnus-summary-article-subject))))
7764
7765 (defun gnus-summary-next-page (&optional lines circular stop)
7766   "Show next page of the selected article.
7767 If at the end of the current article, select the next article.
7768 LINES says how many lines should be scrolled up.
7769
7770 If CIRCULAR is non-nil, go to the start of the article instead of
7771 selecting the next article when reaching the end of the current
7772 article.
7773
7774 If STOP is non-nil, just stop when reaching the end of the message.
7775
7776 Also see the variable `gnus-article-skip-boring'."
7777   (interactive "P")
7778   (setq gnus-summary-buffer (current-buffer))
7779   (gnus-set-global-variables)
7780   (let ((article (gnus-summary-article-number))
7781         (article-window (get-buffer-window gnus-article-buffer t))
7782         endp)
7783     ;; If the buffer is empty, we have no article.
7784     (unless article
7785       (error "No article to select"))
7786     (gnus-configure-windows 'article)
7787     (if (eq (cdr (assq article gnus-newsgroup-reads)) gnus-canceled-mark)
7788         (if (and (eq gnus-summary-goto-unread 'never)
7789                  (not (gnus-summary-last-article-p article)))
7790             (gnus-summary-next-article)
7791           (gnus-summary-next-unread-article))
7792       (if (or (null gnus-current-article)
7793               (null gnus-article-current)
7794               (/= article (cdr gnus-article-current))
7795               (not (equal (car gnus-article-current) gnus-newsgroup-name)))
7796           ;; Selected subject is different from current article's.
7797           (gnus-summary-display-article article)
7798         (when article-window
7799           (gnus-eval-in-buffer-window gnus-article-buffer
7800             (setq endp (or (gnus-article-next-page lines)
7801                            (gnus-article-only-boring-p))))
7802           (when endp
7803             (cond ((or stop gnus-summary-stop-at-end-of-message)
7804                    (gnus-message 3 "End of message"))
7805                   (circular
7806                    (gnus-summary-beginning-of-article))
7807                   (lines
7808                    (gnus-message 3 "End of message"))
7809                   ((null lines)
7810                    (if (and (eq gnus-summary-goto-unread 'never)
7811                             (not (gnus-summary-last-article-p article)))
7812                        (gnus-summary-next-article)
7813                      (gnus-summary-next-unread-article))))))))
7814     (gnus-summary-recenter)
7815     (gnus-summary-position-point)))
7816
7817 (defun gnus-summary-prev-page (&optional lines move)
7818   "Show previous page of selected article.
7819 Argument LINES specifies lines to be scrolled down.
7820 If MOVE, move to the previous unread article if point is at
7821 the beginning of the buffer."
7822   (interactive "P")
7823   (let ((article (gnus-summary-article-number))
7824         (article-window (get-buffer-window gnus-article-buffer t))
7825         endp)
7826     (gnus-configure-windows 'article)
7827     (if (or (null gnus-current-article)
7828             (null gnus-article-current)
7829             (/= article (cdr gnus-article-current))
7830             (not (equal (car gnus-article-current) gnus-newsgroup-name)))
7831         ;; Selected subject is different from current article's.
7832         (gnus-summary-display-article article)
7833       (gnus-summary-recenter)
7834       (when article-window
7835         (gnus-eval-in-buffer-window gnus-article-buffer
7836           (setq endp (gnus-article-prev-page lines)))
7837         (when (and move endp)
7838           (cond (lines
7839                  (gnus-message 3 "Beginning of message"))
7840                 ((null lines)
7841                  (if (and (eq gnus-summary-goto-unread 'never)
7842                           (not (gnus-summary-first-article-p article)))
7843                      (gnus-summary-prev-article)
7844                    (gnus-summary-prev-unread-article))))))))
7845   (gnus-summary-position-point))
7846
7847 (defun gnus-summary-prev-page-or-article (&optional lines)
7848   "Show previous page of selected article.
7849 Argument LINES specifies lines to be scrolled down.
7850 If at the beginning of the article, go to the next article."
7851   (interactive "P")
7852   (gnus-summary-prev-page lines t))
7853
7854 (defun gnus-summary-scroll-up (lines)
7855   "Scroll up (or down) one line current article.
7856 Argument LINES specifies lines to be scrolled up (or down if negative).
7857 If no article is selected, then the current article will be selected first."
7858   (interactive "p")
7859   (gnus-configure-windows 'article)
7860   (gnus-summary-show-thread)
7861   (when (eq (gnus-summary-select-article nil nil 'pseudo) 'old)
7862     (gnus-eval-in-buffer-window gnus-article-buffer
7863       (cond ((> lines 0)
7864              (when (gnus-article-next-page lines)
7865                (gnus-message 3 "End of message")))
7866             ((< lines 0)
7867              (gnus-article-prev-page (- lines))))))
7868   (gnus-summary-recenter)
7869   (gnus-summary-position-point))
7870
7871 (defun gnus-summary-scroll-down (lines)
7872   "Scroll down (or up) one line current article.
7873 Argument LINES specifies lines to be scrolled down (or up if negative).
7874 If no article is selected, then the current article will be selected first."
7875   (interactive "p")
7876   (gnus-summary-scroll-up (- lines)))
7877
7878 (defun gnus-summary-next-same-subject ()
7879   "Select next article which has the same subject as current one."
7880   (interactive)
7881   (gnus-summary-next-article nil (gnus-summary-article-subject)))
7882
7883 (defun gnus-summary-prev-same-subject ()
7884   "Select previous article which has the same subject as current one."
7885   (interactive)
7886   (gnus-summary-prev-article nil (gnus-summary-article-subject)))
7887
7888 (defun gnus-summary-next-unread-same-subject ()
7889   "Select next unread article which has the same subject as current one."
7890   (interactive)
7891   (gnus-summary-next-article t (gnus-summary-article-subject)))
7892
7893 (defun gnus-summary-prev-unread-same-subject ()
7894   "Select previous unread article which has the same subject as current one."
7895   (interactive)
7896   (gnus-summary-prev-article t (gnus-summary-article-subject)))
7897
7898 (defun gnus-summary-first-unread-article ()
7899   "Select the first unread article.
7900 Return nil if there are no unread articles."
7901   (interactive)
7902   (prog1
7903       (when (gnus-summary-first-subject t)
7904         (gnus-summary-show-thread)
7905         (gnus-summary-first-subject t)
7906         (gnus-summary-display-article (gnus-summary-article-number)))
7907     (gnus-summary-position-point)))
7908
7909 (defun gnus-summary-first-unread-subject ()
7910   "Place the point on the subject line of the first unread article.
7911 Return nil if there are no unread articles."
7912   (interactive)
7913   (prog1
7914       (when (gnus-summary-first-subject t)
7915         (gnus-summary-show-thread)
7916         (gnus-summary-first-subject t))
7917     (gnus-summary-position-point)))
7918
7919 (defun gnus-summary-first-unseen-subject ()
7920   "Place the point on the subject line of the first unseen article.
7921 Return nil if there are no unseen articles."
7922   (interactive)
7923   (prog1
7924       (when (gnus-summary-first-subject nil nil t)
7925         (gnus-summary-show-thread)
7926         (gnus-summary-first-subject nil nil t))
7927     (gnus-summary-position-point)))
7928
7929 (defun gnus-summary-first-unseen-or-unread-subject ()
7930   "Place the point on the subject line of the first unseen and unread article.
7931 If all article have been seen, on the subject line of the first unread
7932 article."
7933   (interactive)
7934   (prog1
7935       (unless (when (gnus-summary-first-subject nil nil t)
7936                 (gnus-summary-show-thread)
7937                 (gnus-summary-first-subject nil nil t))
7938         (when (gnus-summary-first-subject t)
7939           (gnus-summary-show-thread)
7940           (gnus-summary-first-subject t)))
7941     (gnus-summary-position-point)))
7942
7943 (defun gnus-summary-first-article ()
7944   "Select the first article.
7945 Return nil if there are no articles."
7946   (interactive)
7947   (prog1
7948       (when (gnus-summary-first-subject)
7949         (gnus-summary-show-thread)
7950         (gnus-summary-first-subject)
7951         (gnus-summary-display-article (gnus-summary-article-number)))
7952     (gnus-summary-position-point)))
7953
7954 (defun gnus-summary-best-unread-article (&optional arg)
7955   "Select the unread article with the highest score.
7956 If given a prefix argument, select the next unread article that has a
7957 score higher than the default score."
7958   (interactive "P")
7959   (let ((article (if arg
7960                      (gnus-summary-better-unread-subject)
7961                    (gnus-summary-best-unread-subject))))
7962     (if article
7963         (gnus-summary-goto-article article)
7964       (error "No unread articles"))))
7965
7966 (defun gnus-summary-best-unread-subject ()
7967   "Select the unread subject with the highest score."
7968   (interactive)
7969   (let ((best -1000000)
7970         (data gnus-newsgroup-data)
7971         article score)
7972     (while data
7973       (and (gnus-data-unread-p (car data))
7974            (> (setq score
7975                     (gnus-summary-article-score (gnus-data-number (car data))))
7976               best)
7977            (setq best score
7978                  article (gnus-data-number (car data))))
7979       (setq data (cdr data)))
7980     (when article
7981       (gnus-summary-goto-subject article))
7982     (gnus-summary-position-point)
7983     article))
7984
7985 (defun gnus-summary-better-unread-subject ()
7986   "Select the first unread subject that has a score over the default score."
7987   (interactive)
7988   (let ((data gnus-newsgroup-data)
7989         article score)
7990     (while (and (setq article (gnus-data-number (car data)))
7991                 (or (gnus-data-read-p (car data))
7992                     (not (> (gnus-summary-article-score article)
7993                             gnus-summary-default-score))))
7994       (setq data (cdr data)))
7995     (when article
7996       (gnus-summary-goto-subject article))
7997     (gnus-summary-position-point)
7998     article))
7999
8000 (defun gnus-summary-last-subject ()
8001   "Go to the last displayed subject line in the group."
8002   (let ((article (gnus-data-number (car (gnus-data-list t)))))
8003     (when article
8004       (gnus-summary-goto-subject article))))
8005
8006 (defun gnus-summary-goto-article (article &optional all-headers force)
8007   "Fetch ARTICLE (article number or Message-ID) and display it if it exists.
8008 If ALL-HEADERS is non-nil, no header lines are hidden.
8009 If FORCE, go to the article even if it isn't displayed.  If FORCE
8010 is a number, it is the line the article is to be displayed on."
8011   (interactive
8012    (list
8013     (gnus-completing-read
8014      "Article number or Message-ID"
8015      (mapcar 'int-to-string gnus-newsgroup-limit))
8016     current-prefix-arg
8017     t))
8018   (prog1
8019       (if (and (stringp article)
8020                (string-match "@\\|%40" article))
8021           (gnus-summary-refer-article article)
8022         (when (stringp article)
8023           (setq article (string-to-number article)))
8024         (if (gnus-summary-goto-subject article force)
8025             (gnus-summary-display-article article all-headers)
8026           (gnus-message 4 "Couldn't go to article %s" article) nil))
8027     (gnus-summary-position-point)))
8028
8029 (defun gnus-summary-goto-last-article ()
8030   "Go to the previously read article."
8031   (interactive)
8032   (prog1
8033       (when gnus-last-article
8034         (gnus-summary-goto-article gnus-last-article nil t))
8035     (gnus-summary-position-point)))
8036
8037 (defun gnus-summary-pop-article (number)
8038   "Pop one article off the history and go to the previous.
8039 NUMBER articles will be popped off."
8040   (interactive "p")
8041   (let (to)
8042     (setq gnus-newsgroup-history
8043           (cdr (setq to (nthcdr number gnus-newsgroup-history))))
8044     (if to
8045         (gnus-summary-goto-article (car to) nil t)
8046       (error "Article history empty")))
8047   (gnus-summary-position-point))
8048
8049 ;; Summary commands and functions for limiting the summary buffer.
8050
8051 (defun gnus-summary-limit-to-articles (n)
8052   "Limit the summary buffer to the next N articles.
8053 If not given a prefix, use the process marked articles instead."
8054   (interactive "P")
8055   (prog1
8056       (let ((articles (gnus-summary-work-articles n)))
8057         (setq gnus-newsgroup-processable nil)
8058         (gnus-summary-limit articles))
8059     (gnus-summary-position-point)))
8060
8061 (defun gnus-summary-pop-limit (&optional total)
8062   "Restore the previous limit.
8063 If given a prefix, remove all limits."
8064   (interactive "P")
8065   (when total
8066     (setq gnus-newsgroup-limits
8067           (list (mapcar (lambda (h) (mail-header-number h))
8068                         gnus-newsgroup-headers))))
8069   (unless gnus-newsgroup-limits
8070     (error "No limit to pop"))
8071   (prog1
8072       (gnus-summary-limit nil 'pop)
8073     (gnus-summary-position-point)))
8074
8075 (defun gnus-summary-limit-to-subject (subject &optional header not-matching)
8076   "Limit the summary buffer to articles that have subjects that match a regexp.
8077 If NOT-MATCHING, excluding articles that have subjects that match a regexp."
8078   (interactive
8079    (list (read-string (if current-prefix-arg
8080                           "Exclude subject (regexp): "
8081                         "Limit to subject (regexp): "))
8082          nil current-prefix-arg))
8083   (unless header
8084     (setq header "subject"))
8085   (when (not (equal "" subject))
8086     (prog1
8087         (let ((articles (gnus-summary-find-matching
8088                          (or header "subject") subject 'all nil nil
8089                          not-matching)))
8090           (unless articles
8091             (error "Found no matches for \"%s\"" subject))
8092           (gnus-summary-limit articles))
8093       (gnus-summary-position-point))))
8094
8095 (defun gnus-summary-limit-to-author (from &optional not-matching)
8096   "Limit the summary buffer to articles that have authors that match a regexp.
8097 If NOT-MATCHING, excluding articles that have authors that match a regexp."
8098   (interactive
8099    (list (read-string (if current-prefix-arg
8100                           "Exclude author (regexp): "
8101                         "Limit to author (regexp): "))
8102          current-prefix-arg))
8103   (gnus-summary-limit-to-subject from "from" not-matching))
8104
8105 (defun gnus-summary-limit-to-recipient (recipient &optional not-matching)
8106   "Limit the summary buffer to articles with the given RECIPIENT.
8107
8108 If NOT-MATCHING, exclude RECIPIENT.
8109
8110 To and Cc headers are checked.  You need to include them in
8111 `nnmail-extra-headers'."
8112   ;; Unlike `rmail-summary-by-recipients', doesn't include From.
8113   (interactive
8114    (list (read-string (format "%s recipient (regexp): "
8115                               (if current-prefix-arg "Exclude" "Limit to")))
8116          current-prefix-arg))
8117   (when (not (equal "" recipient))
8118     (prog1 (let* ((to
8119                    (if (memq 'To nnmail-extra-headers)
8120                        (gnus-summary-find-matching
8121                         (cons 'extra 'To) recipient 'all nil nil
8122                         not-matching)
8123                      (gnus-message
8124                       1 "`To' isn't present in `nnmail-extra-headers'")
8125                      (sit-for 1)
8126                      nil))
8127                   (cc
8128                    (if (memq 'Cc nnmail-extra-headers)
8129                        (gnus-summary-find-matching
8130                         (cons 'extra 'Cc) recipient 'all nil nil
8131                         not-matching)
8132                      (gnus-message
8133                       1 "`Cc' isn't present in `nnmail-extra-headers'")
8134                      (sit-for 1)
8135                      nil))
8136                   (articles
8137                    (if not-matching
8138                        ;; We need the numbers that are in both lists:
8139                        (mapcar (lambda (a)
8140                                  (and (memq a to) a))
8141                                cc)
8142                      (nconc to cc))))
8143              (unless articles
8144                (error "Found no matches for \"%s\"" recipient))
8145              (gnus-summary-limit articles))
8146       (gnus-summary-position-point))))
8147
8148 (defun gnus-summary-limit-to-address (address &optional not-matching)
8149   "Limit the summary buffer to articles with the given ADDRESS.
8150
8151 If NOT-MATCHING, exclude ADDRESS.
8152
8153 To, Cc and From headers are checked.  You need to include `To' and `Cc'
8154 in `nnmail-extra-headers'."
8155   (interactive
8156    (list (read-string (format "%s address (regexp): "
8157                               (if current-prefix-arg "Exclude" "Limit to")))
8158          current-prefix-arg))
8159   (when (not (equal "" address))
8160     (prog1 (let* ((to
8161                    (if (memq 'To nnmail-extra-headers)
8162                        (gnus-summary-find-matching
8163                         (cons 'extra 'To) address 'all nil nil
8164                         not-matching)
8165                      (gnus-message
8166                       1 "`To' isn't present in `nnmail-extra-headers'")
8167                      (sit-for 1)
8168                      t))
8169                   (cc
8170                    (if (memq 'Cc nnmail-extra-headers)
8171                        (gnus-summary-find-matching
8172                         (cons 'extra 'Cc) address 'all nil nil
8173                         not-matching)
8174                      (gnus-message
8175                       1 "`Cc' isn't present in `nnmail-extra-headers'")
8176                      (sit-for 1)
8177                      t))
8178                   (from
8179                    (gnus-summary-find-matching "from" address
8180                                                'all nil nil not-matching))
8181                   (articles
8182                    (if not-matching
8183                        ;; We need the numbers that are in all lists:
8184                        (if (eq cc t)
8185                            (if (eq to t)
8186                                from
8187                              (mapcar (lambda (a) (car (memq a from))) to))
8188                          (if (eq to t)
8189                              (mapcar (lambda (a) (car (memq a from))) cc)
8190                            (mapcar (lambda (a) (car (memq a from)))
8191                                    (mapcar (lambda (a) (car (memq a to)))
8192                                            cc))))
8193                      (nconc (if (eq to t) nil to)
8194                             (if (eq cc t) nil cc)
8195                             from))))
8196              (unless articles
8197                (error "Found no matches for \"%s\"" address))
8198              (gnus-summary-limit articles))
8199       (gnus-summary-position-point))))
8200
8201 (defun gnus-summary-limit-strange-charsets-predicate (header)
8202   (when (fboundp 'char-charset)
8203     (let ((string (concat (mail-header-subject header)
8204                           (mail-header-from header)))
8205           charset found)
8206       (dotimes (i (1- (length string)))
8207         (setq charset (format "%s" (char-charset (aref string (1+ i)))))
8208         (when (string-match "unicode\\|big\\|japanese" charset)
8209           (setq found t)))
8210       found)))
8211
8212 (defun gnus-summary-limit-to-predicate (predicate)
8213   "Limit to articles where PREDICATE returns non-nil.
8214 PREDICATE will be called with the header structures of the
8215 articles."
8216   (let ((articles nil)
8217         (case-fold-search t))
8218     (dolist (header gnus-newsgroup-headers)
8219       (when (funcall predicate header)
8220         (push (mail-header-number header) articles)))
8221     (gnus-summary-limit (nreverse articles))))
8222
8223 (defun gnus-summary-limit-to-age (age &optional younger-p)
8224   "Limit the summary buffer to articles that are older than (or equal) AGE days.
8225 If YOUNGER-P (the prefix) is non-nil, limit the summary buffer to
8226 articles that are younger than AGE days."
8227   (interactive
8228    (let ((younger current-prefix-arg)
8229          (days-got nil)
8230          days)
8231      (while (not days-got)
8232        (setq days (if younger
8233                       (read-string "Limit to articles younger than (in days, older when negative): ")
8234                     (read-string
8235                      "Limit to articles older than (in days, younger when negative): ")))
8236        (when (> (length days) 0)
8237          (setq days (read days)))
8238        (if (numberp days)
8239            (progn
8240              (setq days-got t)
8241              (when (< days 0)
8242                (setq younger (not younger))
8243                (setq days (* days -1))))
8244          (message "Please enter a number.")
8245          (sleep-for 1)))
8246      (list days younger)))
8247   (prog1
8248       (let ((data gnus-newsgroup-data)
8249             (cutoff (days-to-time age))
8250             articles d date is-younger)
8251         (while (setq d (pop data))
8252           (when (and (vectorp (gnus-data-header d))
8253                      (setq date (mail-header-date (gnus-data-header d))))
8254             (setq is-younger (time-less-p
8255                               (time-since (gnus-date-get-time date))
8256                               cutoff))
8257             (when (if younger-p
8258                       is-younger
8259                     (not is-younger))
8260               (push (gnus-data-number d) articles))))
8261         (gnus-summary-limit (nreverse articles)))
8262     (gnus-summary-position-point)))
8263
8264 (defun gnus-summary-limit-to-extra (header regexp &optional not-matching)
8265   "Limit the summary buffer to articles that match an 'extra' header."
8266   (interactive
8267    (let ((header
8268           (intern
8269            (gnus-completing-read
8270             (if current-prefix-arg
8271                 "Exclude extra header"
8272               "Limit extra header")
8273             (mapcar 'symbol-name gnus-extra-headers)
8274             t nil nil
8275             (symbol-name (car gnus-extra-headers))))))
8276      (list header
8277            (read-string (format "%s header %s (regexp): "
8278                                 (if current-prefix-arg "Exclude" "Limit to")
8279                                 header))
8280            current-prefix-arg)))
8281   (when (not (equal "" regexp))
8282     (prog1
8283         (let ((articles (gnus-summary-find-matching
8284                          (cons 'extra header) regexp 'all nil nil
8285                          not-matching)))
8286           (unless articles
8287             (error "Found no matches for \"%s\"" regexp))
8288           (gnus-summary-limit articles))
8289       (gnus-summary-position-point))))
8290
8291 (defun gnus-summary-limit-to-display-predicate ()
8292   "Limit the summary buffer to the predicated in the `display' group parameter."
8293   (interactive)
8294   (unless gnus-newsgroup-display
8295     (error "There is no `display' group parameter"))
8296   (let (articles)
8297     (dolist (gnus-number gnus-newsgroup-articles)
8298       (when (funcall gnus-newsgroup-display)
8299         (push gnus-number articles)))
8300     (gnus-summary-limit articles))
8301   (gnus-summary-position-point))
8302
8303 (defun gnus-summary-limit-to-unread (&optional all)
8304   "Limit the summary buffer to articles that are not marked as read.
8305 If ALL is non-nil, limit strictly to unread articles."
8306   (interactive "P")
8307   (if all
8308       (gnus-summary-limit-to-marks (char-to-string gnus-unread-mark))
8309     (gnus-summary-limit-to-marks
8310      ;; Concat all the marks that say that an article is read and have
8311      ;; those removed.
8312      (list gnus-del-mark gnus-read-mark gnus-ancient-mark
8313            gnus-killed-mark gnus-spam-mark gnus-kill-file-mark
8314            gnus-low-score-mark gnus-expirable-mark
8315            gnus-canceled-mark gnus-catchup-mark gnus-sparse-mark
8316            gnus-duplicate-mark)
8317      'reverse)))
8318
8319 (defun gnus-summary-limit-to-headers (match &optional reverse)
8320   "Limit the summary buffer to articles that have headers that match MATCH.
8321 If REVERSE (the prefix), limit to articles that don't match."
8322   (interactive "sMatch headers (regexp): \nP")
8323   (gnus-summary-limit-to-bodies match reverse t))
8324
8325 (defun gnus-summary-limit-to-bodies (match &optional reverse headersp)
8326   "Limit the summary buffer to articles that have bodies that match MATCH.
8327 If REVERSE (the prefix), limit to articles that don't match."
8328   (interactive "sMatch body (regexp): \nP")
8329   (let ((articles nil)
8330         (gnus-select-article-hook nil)  ;Disable hook.
8331         (gnus-article-prepare-hook nil)
8332         (gnus-use-article-prefetch nil)
8333         (gnus-keep-backlog nil)
8334         (gnus-break-pages nil)
8335         (gnus-summary-display-arrow nil)
8336         (gnus-updated-mode-lines nil)
8337         (gnus-auto-center-summary nil)
8338         (gnus-display-mime-function nil))
8339     (dolist (data gnus-newsgroup-data)
8340       (let (gnus-mark-article-hook)
8341         (gnus-summary-select-article t t nil (gnus-data-number data)))
8342       (with-current-buffer gnus-article-buffer
8343         (article-goto-body)
8344         (let* ((case-fold-search t)
8345                (found (if headersp
8346                           (re-search-backward match nil t)
8347                         (re-search-forward match nil t))))
8348           (when (or (and found
8349                          (not reverse))
8350                     (and (not found)
8351                          reverse))
8352             (push (gnus-data-number data) articles)))))
8353     (if (not articles)
8354         (message "No messages matched")
8355       (gnus-summary-limit articles)))
8356   (gnus-summary-position-point))
8357
8358 (defun gnus-summary-limit-to-singletons (&optional threadsp)
8359   "Limit the summary buffer to articles that aren't part on any thread.
8360 If THREADSP (the prefix), limit to articles that are in threads."
8361   (interactive "P")
8362   (let ((articles nil)
8363         thread-articles
8364         threads)
8365     (dolist (thread gnus-newsgroup-threads)
8366       (if (stringp (car thread))
8367           (dolist (thread (cdr thread))
8368             (push thread threads))
8369         (push thread threads)))
8370     (dolist (thread threads)
8371       (setq thread-articles (gnus-articles-in-thread thread))
8372       (when (or (and threadsp
8373                      (> (length thread-articles) 1))
8374                 (and (not threadsp)
8375                      (= (length thread-articles) 1)))
8376         (setq articles (nconc thread-articles articles))))
8377     (if (not articles)
8378         (message "No messages matched")
8379       (gnus-summary-limit articles))
8380     (gnus-summary-position-point)))
8381
8382 (defun gnus-summary-limit-to-replied (&optional unreplied)
8383   "Limit the summary buffer to replied articles.
8384 If UNREPLIED (the prefix), limit to unreplied articles."
8385   (interactive "P")
8386   (if unreplied
8387       (gnus-summary-limit
8388        (gnus-set-difference gnus-newsgroup-articles
8389         gnus-newsgroup-replied))
8390     (gnus-summary-limit gnus-newsgroup-replied))
8391   (gnus-summary-position-point))
8392
8393 (defun gnus-summary-limit-exclude-marks (marks &optional reverse)
8394   "Exclude articles that are marked with MARKS (e.g. \"DK\").
8395 If REVERSE, limit the summary buffer to articles that are marked
8396 with MARKS.  MARKS can either be a string of marks or a list of marks.
8397 Returns how many articles were removed."
8398   (interactive "sMarks: ")
8399   (gnus-summary-limit-to-marks marks t))
8400
8401 (defun gnus-summary-limit-to-marks (marks &optional reverse)
8402   "Limit the summary buffer to articles that are marked with MARKS (e.g. \"DK\").
8403 If REVERSE (the prefix), limit the summary buffer to articles that are
8404 not marked with MARKS.  MARKS can either be a string of marks or a
8405 list of marks.
8406 Returns how many articles were removed."
8407   (interactive "sMarks: \nP")
8408   (prog1
8409       (let ((data gnus-newsgroup-data)
8410             (marks (if (listp marks) marks
8411                      (append marks nil))) ; Transform to list.
8412             articles)
8413         (while data
8414           (when (if reverse (not (memq (gnus-data-mark (car data)) marks))
8415                   (memq (gnus-data-mark (car data)) marks))
8416             (push (gnus-data-number (car data)) articles))
8417           (setq data (cdr data)))
8418         (gnus-summary-limit articles))
8419     (gnus-summary-position-point)))
8420
8421 (defun gnus-summary-limit-to-score (score)
8422   "Limit to articles with score at or above SCORE."
8423   (interactive "NLimit to articles with score of at least: ")
8424   (let ((data gnus-newsgroup-data)
8425         articles)
8426     (while data
8427       (when (>= (gnus-summary-article-score (gnus-data-number (car data)))
8428                 score)
8429         (push (gnus-data-number (car data)) articles))
8430       (setq data (cdr data)))
8431     (prog1
8432         (gnus-summary-limit articles)
8433       (gnus-summary-position-point))))
8434
8435 (defun gnus-summary-limit-to-unseen ()
8436   "Limit to unseen articles."
8437   (interactive)
8438   (prog1
8439       (gnus-summary-limit gnus-newsgroup-unseen)
8440     (gnus-summary-position-point)))
8441
8442 (defun gnus-summary-limit-include-thread (id)
8443   "Display all the hidden articles that is in the thread with ID in it.
8444 When called interactively, ID is the Message-ID of the current
8445 article."
8446   (interactive (list (mail-header-id (gnus-summary-article-header))))
8447   (let ((articles (gnus-articles-in-thread
8448                    (gnus-id-to-thread (gnus-root-id id)))))
8449     (prog1
8450         (gnus-summary-limit (nconc articles gnus-newsgroup-limit))
8451       (gnus-summary-limit-include-matching-articles
8452        "subject"
8453        (regexp-quote (gnus-simplify-subject-re
8454                       (mail-header-subject (gnus-id-to-header id)))))
8455       (gnus-summary-position-point))))
8456
8457 (defun gnus-summary-limit-include-matching-articles (header regexp)
8458   "Display all the hidden articles that have HEADERs that match REGEXP."
8459   (interactive (list (read-string "Match on header: ")
8460                      (read-string "Regexp: ")))
8461   (let ((articles (gnus-find-matching-articles header regexp)))
8462     (prog1
8463         (gnus-summary-limit (nconc articles gnus-newsgroup-limit))
8464       (gnus-summary-position-point))))
8465
8466 (defun gnus-summary-insert-dormant-articles ()
8467   "Insert all the dormant articles for this group into the current buffer."
8468   (interactive)
8469   (let ((gnus-verbose (max 6 gnus-verbose)))
8470     (if (not gnus-newsgroup-dormant)
8471         (gnus-message 3 "No dormant articles for this group")
8472       (gnus-summary-goto-subjects gnus-newsgroup-dormant))))
8473
8474 (defun gnus-summary-insert-ticked-articles ()
8475   "Insert ticked articles for this group into the current buffer."
8476   (interactive)
8477   (let ((gnus-verbose (max 6 gnus-verbose)))
8478     (if (not gnus-newsgroup-marked)
8479         (gnus-message 3 "No ticked articles for this group")
8480       (gnus-summary-goto-subjects gnus-newsgroup-marked))))
8481
8482 (defun gnus-summary-limit-include-dormant ()
8483   "Display all the hidden articles that are marked as dormant.
8484 Note that this command only works on a subset of the articles currently
8485 fetched for this group."
8486   (interactive)
8487   (unless gnus-newsgroup-dormant
8488     (error "There are no dormant articles in this group"))
8489   (prog1
8490       (gnus-summary-limit (append gnus-newsgroup-dormant gnus-newsgroup-limit))
8491     (gnus-summary-position-point)))
8492
8493 (defun gnus-summary-limit-exclude-dormant ()
8494   "Hide all dormant articles."
8495   (interactive)
8496   (prog1
8497       (gnus-summary-limit-to-marks (list gnus-dormant-mark) 'reverse)
8498     (gnus-summary-position-point)))
8499
8500 (defun gnus-summary-limit-exclude-childless-dormant ()
8501   "Hide all dormant articles that have no children."
8502   (interactive)
8503   (let ((data (gnus-data-list t))
8504         articles d children)
8505     ;; Find all articles that are either not dormant or have
8506     ;; children.
8507     (while (setq d (pop data))
8508       (when (or (not (= (gnus-data-mark d) gnus-dormant-mark))
8509                 (and (setq children
8510                            (gnus-article-children (gnus-data-number d)))
8511                      (let (found)
8512                        (while children
8513                          (when (memq (car children) articles)
8514                            (setq children nil
8515                                  found t))
8516                          (pop children))
8517                        found)))
8518         (push (gnus-data-number d) articles)))
8519     ;; Do the limiting.
8520     (prog1
8521         (gnus-summary-limit articles)
8522       (gnus-summary-position-point))))
8523
8524 (defun gnus-summary-limit-mark-excluded-as-read (&optional all)
8525   "Mark all unread excluded articles as read.
8526 If ALL, mark even excluded ticked and dormants as read."
8527   (interactive "P")
8528   (setq gnus-newsgroup-limit (sort gnus-newsgroup-limit '<))
8529   (let ((articles (gnus-sorted-ndifference
8530                    (sort
8531                     (mapcar (lambda (h) (mail-header-number h))
8532                             gnus-newsgroup-headers)
8533                     '<)
8534                    gnus-newsgroup-limit))
8535         article)
8536     (setq gnus-newsgroup-unreads
8537           (gnus-sorted-intersection gnus-newsgroup-unreads
8538                                     gnus-newsgroup-limit))
8539     (if all
8540         (setq gnus-newsgroup-dormant nil
8541               gnus-newsgroup-marked nil
8542               gnus-newsgroup-reads
8543               (nconc
8544                (mapcar (lambda (n) (cons n gnus-catchup-mark)) articles)
8545                gnus-newsgroup-reads))
8546       (while (setq article (pop articles))
8547         (unless (or (memq article gnus-newsgroup-dormant)
8548                     (memq article gnus-newsgroup-marked))
8549           (push (cons article gnus-catchup-mark) gnus-newsgroup-reads))))))
8550
8551 (defun gnus-summary-limit (articles &optional pop)
8552   (if pop
8553       ;; We pop the previous limit off the stack and use that.
8554       (setq articles (car gnus-newsgroup-limits)
8555             gnus-newsgroup-limits (cdr gnus-newsgroup-limits))
8556     ;; We use the new limit, so we push the old limit on the stack.
8557     (push gnus-newsgroup-limit gnus-newsgroup-limits))
8558   ;; Set the limit.
8559   (setq gnus-newsgroup-limit articles)
8560   (let ((total (length gnus-newsgroup-data))
8561         (data (gnus-data-find-list (gnus-summary-article-number)))
8562         (gnus-summary-mark-below nil)   ; Inhibit this.
8563         found)
8564     ;; This will do all the work of generating the new summary buffer
8565     ;; according to the new limit.
8566     (gnus-summary-prepare)
8567     ;; Hide any threads, possibly.
8568     (gnus-summary-maybe-hide-threads)
8569     ;; Try to return to the article you were at, or one in the
8570     ;; neighborhood.
8571     (when data
8572       ;; We try to find some article after the current one.
8573       (while data
8574         (when (gnus-summary-goto-subject (gnus-data-number (car data)) nil t)
8575           (setq data nil
8576                 found t))
8577         (setq data (cdr data))))
8578     (unless found
8579       ;; If there is no data, that means that we were after the last
8580       ;; article.  The same goes when we can't find any articles
8581       ;; after the current one.
8582       (goto-char (point-max))
8583       (gnus-summary-find-prev))
8584     (gnus-set-mode-line 'summary)
8585     ;; We return how many articles were removed from the summary
8586     ;; buffer as a result of the new limit.
8587     (- total (length gnus-newsgroup-data))))
8588
8589 (defsubst gnus-invisible-cut-children (threads)
8590   (let ((num 0))
8591     (while threads
8592       (when (memq (mail-header-number (caar threads)) gnus-newsgroup-limit)
8593         (incf num))
8594       (pop threads))
8595     (< num 2)))
8596
8597 (defsubst gnus-cut-thread (thread)
8598   "Go forwards in the thread until we find an article that we want to display."
8599   (when (or (eq gnus-fetch-old-headers 'some)
8600             (eq gnus-fetch-old-headers 'invisible)
8601             (numberp gnus-fetch-old-headers)
8602             (eq gnus-build-sparse-threads 'some)
8603             (eq gnus-build-sparse-threads 'more))
8604     ;; Deal with old-fetched headers and sparse threads.
8605     (while (and
8606             thread
8607             (or
8608              (gnus-summary-article-sparse-p (mail-header-number (car thread)))
8609              (gnus-summary-article-ancient-p
8610               (mail-header-number (car thread))))
8611             (if (or (<= (length (cdr thread)) 1)
8612                     (eq gnus-fetch-old-headers 'invisible))
8613                 (setq gnus-newsgroup-limit
8614                       (delq (mail-header-number (car thread))
8615                             gnus-newsgroup-limit)
8616                       thread (cadr thread))
8617               (when (gnus-invisible-cut-children (cdr thread))
8618                 (let ((th (cdr thread)))
8619                   (while th
8620                     (if (memq (mail-header-number (caar th))
8621                               gnus-newsgroup-limit)
8622                         (setq thread (car th)
8623                               th nil)
8624                       (setq th (cdr th))))))))))
8625   thread)
8626
8627 (defun gnus-cut-threads (threads)
8628   "Cut off all uninteresting articles from the beginning of THREADS."
8629   (when (or (eq gnus-fetch-old-headers 'some)
8630             (eq gnus-fetch-old-headers 'invisible)
8631             (numberp gnus-fetch-old-headers)
8632             (eq gnus-build-sparse-threads 'some)
8633             (eq gnus-build-sparse-threads 'more))
8634     (let ((th threads))
8635       (while th
8636         (setcar th (gnus-cut-thread (car th)))
8637         (setq th (cdr th)))))
8638   ;; Remove nixed out threads.
8639   (delq nil threads))
8640
8641 (defun gnus-summary-initial-limit (&optional show-if-empty)
8642   "Figure out what the initial limit is supposed to be on group entry.
8643 This entails weeding out unwanted dormants, low-scored articles,
8644 fetch-old-headers verbiage, and so on."
8645   ;; Most groups have nothing to remove.
8646   (unless (or gnus-inhibit-limiting
8647               (and (null gnus-newsgroup-dormant)
8648                    (eq gnus-newsgroup-display 'gnus-not-ignore)
8649                    (not (eq gnus-fetch-old-headers 'some))
8650                    (not (numberp gnus-fetch-old-headers))
8651                    (not (eq gnus-fetch-old-headers 'invisible))
8652                    (null gnus-summary-expunge-below)
8653                    (not (eq gnus-build-sparse-threads 'some))
8654                    (not (eq gnus-build-sparse-threads 'more))
8655                    (null gnus-thread-expunge-below)))
8656     (push gnus-newsgroup-limit gnus-newsgroup-limits)
8657     (setq gnus-newsgroup-limit nil)
8658     (mapatoms
8659      (lambda (node)
8660        (unless (car (symbol-value node))
8661          ;; These threads have no parents -- they are roots.
8662          (let ((nodes (cdr (symbol-value node)))
8663                thread)
8664            (while nodes
8665              (if (and gnus-thread-expunge-below
8666                       (< (gnus-thread-total-score (car nodes))
8667                          gnus-thread-expunge-below))
8668                  (gnus-expunge-thread (pop nodes))
8669                (setq thread (pop nodes))
8670                (gnus-summary-limit-children thread))))))
8671      gnus-newsgroup-dependencies)
8672     ;; If this limitation resulted in an empty group, we might
8673     ;; pop the previous limit and use it instead.
8674     (when (and (not gnus-newsgroup-limit)
8675                show-if-empty)
8676       (setq gnus-newsgroup-limit (pop gnus-newsgroup-limits)))
8677     gnus-newsgroup-limit))
8678
8679 (defun gnus-summary-limit-children (thread)
8680   "Return 1 if this subthread is visible and 0 if it is not."
8681   ;; First we get the number of visible children to this thread.  This
8682   ;; is done by recursing down the thread using this function, so this
8683   ;; will really go down to a leaf article first, before slowly
8684   ;; working its way up towards the root.
8685   (when thread
8686     (let* ((max-lisp-eval-depth (max 5000 max-lisp-eval-depth))
8687            (children
8688            (if (cdr thread)
8689                (apply '+ (mapcar 'gnus-summary-limit-children
8690                                  (cdr thread)))
8691              0))
8692            (number (mail-header-number (car thread)))
8693            score)
8694       (if (and
8695            (not (memq number gnus-newsgroup-marked))
8696            (or
8697             ;; If this article is dormant and has absolutely no visible
8698             ;; children, then this article isn't visible.
8699             (and (memq number gnus-newsgroup-dormant)
8700                  (zerop children))
8701             ;; If this is "fetch-old-headered" and there is no
8702             ;; visible children, then we don't want this article.
8703             (and (or (eq gnus-fetch-old-headers 'some)
8704                      (numberp gnus-fetch-old-headers))
8705                  (gnus-summary-article-ancient-p number)
8706                  (zerop children))
8707             ;; If this is "fetch-old-headered" and `invisible', then
8708             ;; we don't want this article.
8709             (and (eq gnus-fetch-old-headers 'invisible)
8710                  (gnus-summary-article-ancient-p number))
8711             ;; If this is a sparsely inserted article with no children,
8712             ;; we don't want it.
8713             (and (eq gnus-build-sparse-threads 'some)
8714                  (gnus-summary-article-sparse-p number)
8715                  (zerop children))
8716             ;; If we use expunging, and this article is really
8717             ;; low-scored, then we don't want this article.
8718             (when (and gnus-summary-expunge-below
8719                        (< (setq score
8720                                 (or (cdr (assq number gnus-newsgroup-scored))
8721                                     gnus-summary-default-score))
8722                           gnus-summary-expunge-below))
8723               ;; We increase the expunge-tally here, but that has
8724               ;; nothing to do with the limits, really.
8725               (incf gnus-newsgroup-expunged-tally)
8726               ;; We also mark as read here, if that's wanted.
8727               (when (and gnus-summary-mark-below
8728                          (< score gnus-summary-mark-below))
8729                 (setq gnus-newsgroup-unreads
8730                       (delq number gnus-newsgroup-unreads))
8731                 (if gnus-newsgroup-auto-expire
8732                     (push number gnus-newsgroup-expirable)
8733                   (push (cons number gnus-low-score-mark)
8734                         gnus-newsgroup-reads)))
8735               t)
8736             ;; Do the `display' group parameter.
8737             (and gnus-newsgroup-display
8738                  (let ((gnus-number number))
8739                    (not (funcall gnus-newsgroup-display))))))
8740           ;; Nope, invisible article.
8741           0
8742         ;; Ok, this article is to be visible, so we add it to the limit
8743         ;; and return 1.
8744         (push number gnus-newsgroup-limit)
8745         1))))
8746
8747 (defun gnus-expunge-thread (thread)
8748   "Mark all articles in THREAD as read."
8749   (let* ((number (mail-header-number (car thread))))
8750     (incf gnus-newsgroup-expunged-tally)
8751     ;; We also mark as read here, if that's wanted.
8752     (setq gnus-newsgroup-unreads
8753           (delq number gnus-newsgroup-unreads))
8754     (if gnus-newsgroup-auto-expire
8755         (push number gnus-newsgroup-expirable)
8756       (push (cons number gnus-low-score-mark)
8757             gnus-newsgroup-reads)))
8758   ;; Go recursively through all subthreads.
8759   (mapcar 'gnus-expunge-thread (cdr thread)))
8760
8761 ;; Summary article oriented commands
8762
8763 (defun gnus-summary-refer-parent-article (n)
8764   "Refer parent article N times.
8765 If N is negative, go to ancestor -N instead.
8766 The difference between N and the number of articles fetched is returned."
8767   (interactive "p")
8768   (let ((skip 1)
8769         error header ref)
8770     (when (not (natnump n))
8771       (setq skip (abs n)
8772             n 1))
8773     (while (and (> n 0)
8774                 (not error))
8775       (setq header (gnus-summary-article-header))
8776       (if (and (eq (mail-header-number header)
8777                    (cdr gnus-article-current))
8778                (equal gnus-newsgroup-name
8779                       (car gnus-article-current)))
8780           ;; If we try to find the parent of the currently
8781           ;; displayed article, then we take a look at the actual
8782           ;; References header, since this is slightly more
8783           ;; reliable than the References field we got from the
8784           ;; server.
8785           (with-current-buffer gnus-original-article-buffer
8786             (nnheader-narrow-to-headers)
8787             (unless (setq ref (message-fetch-field "references"))
8788               (when (setq ref (message-fetch-field "in-reply-to"))
8789                 (setq ref (gnus-extract-message-id-from-in-reply-to ref))))
8790             (widen))
8791         (setq ref
8792               ;; It's not the current article, so we take a bet on
8793               ;; the value we got from the server.
8794               (mail-header-references header)))
8795       (if (and ref
8796                (not (equal ref "")))
8797           (unless (gnus-summary-refer-article (gnus-parent-id ref skip))
8798             (gnus-message 1 "Couldn't find parent"))
8799         (gnus-message 1 "No references in article %d"
8800                       (gnus-summary-article-number))
8801         (setq error t))
8802       (decf n))
8803     (gnus-summary-position-point)
8804     n))
8805
8806 (defun gnus-summary-refer-references ()
8807   "Fetch all articles mentioned in the References header.
8808 Return the number of articles fetched."
8809   (interactive)
8810   (let ((ref (mail-header-references (gnus-summary-article-header)))
8811         (current (gnus-summary-article-number))
8812         (n 0))
8813     (if (or (not ref)
8814             (equal ref ""))
8815         (error "No References in the current article")
8816       ;; For each Message-ID in the References header...
8817       (while (string-match "<[^>]*>" ref)
8818         (incf n)
8819         ;; ... fetch that article.
8820         (gnus-summary-refer-article
8821          (prog1 (match-string 0 ref)
8822            (setq ref (substring ref (match-end 0))))))
8823       (gnus-summary-goto-subject current)
8824       (gnus-summary-position-point)
8825       n)))
8826
8827 (defun gnus-summary-refer-thread (&optional limit)
8828   "Fetch all articles in the current thread.
8829 If no backend-specific 'request-thread function is available
8830 fetch LIMIT (the numerical prefix) old headers. If LIMIT is nil
8831 fetch what's specified by the `gnus-refer-thread-limit'
8832 variable."
8833   (interactive "P")
8834   (let ((id (mail-header-id (gnus-summary-article-header)))
8835         (gnus-summary-ignore-duplicates t)
8836         (limit (if limit (prefix-numeric-value limit)
8837                  gnus-refer-thread-limit)))
8838     (if  (gnus-check-backend-function 'request-thread gnus-newsgroup-name)
8839         (setq gnus-newsgroup-headers
8840               (gnus-merge 'list
8841                           gnus-newsgroup-headers
8842                           (gnus-request-thread id)
8843                           'gnus-article-sort-by-number))
8844       (unless (eq gnus-fetch-old-headers 'invisible)
8845         (gnus-message 5 "Fetching headers for %s..." gnus-newsgroup-name)
8846         ;;      Retrieve the headers and read them in.
8847         (if (numberp limit)
8848             (gnus-retrieve-headers
8849              (list (min
8850                     (+ (mail-header-number
8851                         (gnus-summary-article-header))
8852                        limit)
8853                     gnus-newsgroup-end))
8854              gnus-newsgroup-name (* limit 2))
8855           ;; gnus-refer-thread-limit is t, i.e. fetch _all_
8856           ;; headers.
8857           (gnus-retrieve-headers (list gnus-newsgroup-end)
8858                                  gnus-newsgroup-name limit)
8859           (gnus-message 5 "Fetching headers for %s...done"
8860                         gnus-newsgroup-name))))
8861     (when (eq gnus-headers-retrieved-by 'nov)
8862       (gnus-build-all-threads))
8863     (gnus-summary-limit-include-thread id)))
8864
8865 (defun gnus-summary-refer-article (message-id)
8866   "Fetch an article specified by MESSAGE-ID."
8867   (interactive "sMessage-ID: ")
8868   (when (and (stringp message-id)
8869              (not (zerop (length message-id))))
8870     (setq message-id (gnus-replace-in-string message-id " " ""))
8871     ;; Construct the correct Message-ID if necessary.
8872     ;; Suggested by tale@pawl.rpi.edu.
8873     (unless (string-match "^<" message-id)
8874       (setq message-id (concat "<" message-id)))
8875     (unless (string-match ">$" message-id)
8876       (setq message-id (concat message-id ">")))
8877     ;; People often post MIDs from URLs, so unhex it:
8878     (unless (string-match "@" message-id)
8879       (setq message-id (gnus-url-unhex-string message-id)))
8880     (let* ((header (gnus-id-to-header message-id))
8881            (sparse (and header
8882                         (gnus-summary-article-sparse-p
8883                          (mail-header-number header))
8884                         (memq (mail-header-number header)
8885                               gnus-newsgroup-limit)))
8886            number)
8887       (cond
8888        ;; If the article is present in the buffer we just go to it.
8889        ((and header
8890              (or (not (gnus-summary-article-sparse-p
8891                        (mail-header-number header)))
8892                  sparse))
8893         (prog1
8894             (gnus-summary-goto-article
8895              (mail-header-number header) nil t)
8896           (when sparse
8897             (gnus-summary-update-article (mail-header-number header)))))
8898        (t
8899         ;; We fetch the article.
8900         (catch 'found
8901           (dolist (gnus-override-method (gnus-refer-article-methods))
8902             (when (and (gnus-check-server gnus-override-method)
8903                        ;; Fetch the header,
8904                        (setq number (gnus-summary-insert-subject message-id)))
8905               ;; and display the article.
8906               (gnus-summary-select-article nil nil nil number)
8907               (throw 'found t)))
8908           (gnus-message 3 "Couldn't fetch article %s" message-id)))))))
8909
8910 (defun gnus-refer-article-methods ()
8911   "Return a list of referable methods."
8912   (cond
8913    ;; No method, so we default to current and native.
8914    ((null gnus-refer-article-method)
8915     (list gnus-current-select-method gnus-select-method))
8916    ;; Current.
8917    ((eq 'current gnus-refer-article-method)
8918     (list gnus-current-select-method))
8919    ;; List of select methods.
8920    ((not (and (symbolp (car gnus-refer-article-method))
8921               (assq (car gnus-refer-article-method) nnoo-definition-alist)))
8922     (let (out)
8923       (dolist (method gnus-refer-article-method)
8924         (push (if (eq 'current method)
8925                   gnus-current-select-method
8926                 method)
8927               out))
8928       (nreverse out)))
8929    ;; One single select method.
8930    (t
8931     (list gnus-refer-article-method))))
8932
8933 (defun gnus-summary-edit-parameters ()
8934   "Edit the group parameters of the current group."
8935   (interactive)
8936   (gnus-group-edit-group gnus-newsgroup-name 'params))
8937
8938 (defun gnus-summary-customize-parameters ()
8939   "Customize the group parameters of the current group."
8940   (interactive)
8941   (gnus-group-customize gnus-newsgroup-name))
8942
8943 (defun gnus-summary-enter-digest-group (&optional force)
8944   "Enter an nndoc group based on the current article.
8945 If FORCE, force a digest interpretation.  If not, try
8946 to guess what the document format is."
8947   (interactive "P")
8948   (let ((conf gnus-current-window-configuration))
8949     (save-window-excursion
8950       (save-excursion
8951         (let (gnus-article-prepare-hook
8952               gnus-display-mime-function
8953               gnus-break-pages)
8954           (gnus-summary-select-article))))
8955     (setq gnus-current-window-configuration conf)
8956     (let* ((name (format "%s-%d"
8957                          (gnus-group-prefixed-name
8958                           gnus-newsgroup-name (list 'nndoc ""))
8959                          (with-current-buffer gnus-summary-buffer
8960                            gnus-current-article)))
8961            (ogroup gnus-newsgroup-name)
8962            (params (append (gnus-info-params (gnus-get-info ogroup))
8963                            (list (cons 'to-group ogroup))
8964                            (list (cons 'parent-group ogroup))
8965                            (list (cons 'save-article-group ogroup))))
8966            (case-fold-search t)
8967            (buf (current-buffer))
8968            dig to-address)
8969       (with-current-buffer gnus-original-article-buffer
8970         ;; Have the digest group inherit the main mail address of
8971         ;; the parent article.
8972         (when (setq to-address (or (gnus-fetch-field "reply-to")
8973                                    (gnus-fetch-field "from")))
8974           (setq params
8975                 (append
8976                  (list (cons 'to-address
8977                              (funcall gnus-decode-encoded-address-function
8978                                       to-address))))))
8979         (setq dig (nnheader-set-temp-buffer " *gnus digest buffer*"))
8980         (insert-buffer-substring gnus-original-article-buffer)
8981         ;; Remove lines that may lead nndoc to misinterpret the
8982         ;; document type.
8983         (narrow-to-region
8984          (goto-char (point-min))
8985          (or (search-forward "\n\n" nil t) (point)))
8986         (goto-char (point-min))
8987         (delete-matching-lines "^Path:\\|^From ")
8988         (widen))
8989       (unwind-protect
8990           (if (let ((gnus-newsgroup-ephemeral-charset gnus-newsgroup-charset)
8991                     (gnus-newsgroup-ephemeral-ignored-charsets
8992                      gnus-newsgroup-ignored-charsets))
8993                 (gnus-group-read-ephemeral-group
8994                  name `(nndoc ,name (nndoc-address ,(get-buffer dig))
8995                               (nndoc-article-type
8996                                ,(if force 'mbox 'guess)))
8997                  t nil nil nil
8998                  `((adapt-file . ,(gnus-score-file-name gnus-newsgroup-name
8999                                                         "ADAPT")))))
9000               ;; Make all postings to this group go to the parent group.
9001               (nconc (gnus-info-params (gnus-get-info name))
9002                      params)
9003             ;; Couldn't select this doc group.
9004             (switch-to-buffer buf)
9005             (gnus-set-global-variables)
9006             (gnus-configure-windows 'summary)
9007             (gnus-message 3 "Article couldn't be entered?"))
9008         (kill-buffer dig)))))
9009
9010 (defun gnus-summary-read-document (n)
9011   "Open a new group based on the current article(s).
9012 This will allow you to read digests and other similar
9013 documents as newsgroups.
9014 Obeys the standard process/prefix convention."
9015   (interactive "P")
9016   (let* ((ogroup gnus-newsgroup-name)
9017          (params (append (gnus-info-params (gnus-get-info ogroup))
9018                          (list (cons 'to-group ogroup))))
9019          group egroup groups vgroup)
9020     (dolist (article (gnus-summary-work-articles n))
9021       (setq group (format "%s-%d" gnus-newsgroup-name article))
9022       (gnus-summary-remove-process-mark article)
9023       (when (gnus-summary-display-article article)
9024         (save-excursion ;;What for?
9025           (with-temp-buffer
9026             (insert-buffer-substring gnus-original-article-buffer)
9027             ;; Remove some headers that may lead nndoc to make
9028             ;; the wrong guess.
9029             (message-narrow-to-head)
9030             (goto-char (point-min))
9031             (delete-matching-lines "^Path:\\|^From ")
9032             (widen)
9033             (if (setq egroup
9034                       (gnus-group-read-ephemeral-group
9035                        group `(nndoc ,group (nndoc-address ,(current-buffer))
9036                                      (nndoc-article-type guess))
9037                        t nil t))
9038                 (progn
9039                   ;; Make all postings to this group go to the parent group.
9040                   (nconc (gnus-info-params (gnus-get-info egroup))
9041                          params)
9042                   (push egroup groups))
9043               ;; Couldn't select this doc group.
9044               (gnus-error 3 "Article couldn't be entered"))))))
9045     ;; Now we have selected all the documents.
9046     (cond
9047      ((not groups)
9048       (error "None of the articles could be interpreted as documents"))
9049      ((gnus-group-read-ephemeral-group
9050        (setq vgroup (format
9051                      "nnvirtual:%s-%s" gnus-newsgroup-name
9052                      (format-time-string "%Y%m%dT%H%M%S" (current-time))))
9053        `(nnvirtual ,vgroup (nnvirtual-component-groups ,groups))
9054        t
9055        (cons (current-buffer) 'summary)))
9056      (t
9057       (error "Couldn't select virtual nndoc group")))))
9058
9059 (defun gnus-summary-isearch-article (&optional regexp-p)
9060   "Do incremental search forward on the current article.
9061 If REGEXP-P (the prefix) is non-nil, do regexp isearch."
9062   (interactive "P")
9063   (gnus-summary-select-article)
9064   (gnus-configure-windows 'article)
9065   (gnus-eval-in-buffer-window gnus-article-buffer
9066     (save-restriction
9067       (widen)
9068       (isearch-forward regexp-p))))
9069
9070 (defun gnus-summary-repeat-search-article-forward ()
9071   "Repeat the previous search forwards."
9072   (interactive)
9073   (unless gnus-last-search-regexp
9074     (error "No previous search"))
9075   (gnus-summary-search-article-forward gnus-last-search-regexp))
9076
9077 (defun gnus-summary-repeat-search-article-backward ()
9078   "Repeat the previous search backwards."
9079   (interactive)
9080   (unless gnus-last-search-regexp
9081     (error "No previous search"))
9082   (gnus-summary-search-article-forward gnus-last-search-regexp t))
9083
9084 (defun gnus-summary-search-article-forward (regexp &optional backward)
9085   "Search for an article containing REGEXP forward.
9086 If BACKWARD, search backward instead."
9087   (interactive
9088    (list (read-string
9089           (format "Search article %s (regexp%s): "
9090                   (if current-prefix-arg "backward" "forward")
9091                   (if gnus-last-search-regexp
9092                       (concat ", default " gnus-last-search-regexp)
9093                     "")))
9094          current-prefix-arg))
9095   (if (string-equal regexp "")
9096       (setq regexp (or gnus-last-search-regexp ""))
9097     (setq gnus-last-search-regexp regexp)
9098     (setq gnus-article-before-search gnus-current-article))
9099   ;; Intentionally set gnus-last-article.
9100   (setq gnus-last-article gnus-article-before-search)
9101   (let ((gnus-last-article gnus-last-article))
9102     (if (gnus-summary-search-article regexp backward)
9103         (gnus-summary-show-thread)
9104       (signal 'search-failed (list regexp)))))
9105
9106 (defun gnus-summary-search-article-backward (regexp)
9107   "Search for an article containing REGEXP backward."
9108   (interactive
9109    (list (read-string
9110           (format "Search article backward (regexp%s): "
9111                   (if gnus-last-search-regexp
9112                       (concat ", default " gnus-last-search-regexp)
9113                     "")))))
9114   (gnus-summary-search-article-forward regexp 'backward))
9115
9116 (defun gnus-summary-search-article (regexp &optional backward)
9117   "Search for an article containing REGEXP.
9118 Optional argument BACKWARD means do search for backward.
9119 `gnus-select-article-hook' is not called during the search."
9120   ;; We have to require this here to make sure that the following
9121   ;; dynamic binding isn't shadowed by autoloading.
9122   (require 'gnus-async)
9123   (require 'gnus-art)
9124   (let ((gnus-select-article-hook nil)  ;Disable hook.
9125         (gnus-article-prepare-hook nil)
9126         (gnus-mark-article-hook nil)    ;Inhibit marking as read.
9127         (gnus-use-article-prefetch nil)
9128         (gnus-xmas-force-redisplay nil) ;Inhibit XEmacs redisplay.
9129         (gnus-use-trees nil)            ;Inhibit updating tree buffer.
9130         (gnus-visual nil)
9131         (gnus-keep-backlog nil)
9132         (gnus-break-pages nil)
9133         (gnus-summary-display-arrow nil)
9134         (gnus-updated-mode-lines nil)
9135         (gnus-auto-center-summary nil)
9136         (sum (current-buffer))
9137         (gnus-display-mime-function nil)
9138         (found nil)
9139         point)
9140     (gnus-save-hidden-threads
9141       (gnus-summary-select-article)
9142       (set-buffer gnus-article-buffer)
9143       (goto-char (window-point (get-buffer-window (current-buffer))))
9144       (when backward
9145         (forward-line -1))
9146       (while (not found)
9147         (gnus-message 7 "Searching article: %d..." (cdr gnus-article-current))
9148         (if (if backward
9149                 (re-search-backward regexp nil t)
9150               (re-search-forward regexp nil t))
9151             ;; We found the regexp.
9152             (progn
9153               (setq found 'found)
9154               (beginning-of-line)
9155               (set-window-start
9156                (get-buffer-window (current-buffer))
9157                (point))
9158               (forward-line 1)
9159               (set-window-point
9160                (get-buffer-window (current-buffer))
9161                (point))
9162               (set-buffer sum)
9163               (setq point (point)))
9164           ;; We didn't find it, so we go to the next article.
9165           (set-buffer sum)
9166           (setq found 'not)
9167           (while (eq found 'not)
9168             (if (not (if backward (gnus-summary-find-prev)
9169                        (gnus-summary-find-next)))
9170                 ;; No more articles.
9171                 (setq found t)
9172               ;; Select the next article and adjust point.
9173               (unless (gnus-summary-article-sparse-p
9174                        (gnus-summary-article-number))
9175                 (setq found nil)
9176                 (gnus-summary-select-article)
9177                 (set-buffer gnus-article-buffer)
9178                 (widen)
9179                 (goto-char (if backward (point-max) (point-min))))))))
9180       (gnus-message 7 ""))
9181     ;; Return whether we found the regexp.
9182     (when (eq found 'found)
9183       (goto-char point)
9184       (gnus-summary-show-thread)
9185       (gnus-summary-goto-subject gnus-current-article)
9186       (gnus-summary-position-point)
9187       t)))
9188
9189 (defun gnus-find-matching-articles (header regexp)
9190   "Return a list of all articles that match REGEXP on HEADER.
9191 This search includes all articles in the current group that Gnus has
9192 fetched headers for, whether they are displayed or not."
9193   (let ((articles nil)
9194         ;; Can't eta-reduce because it's a macro.
9195         (func `(lambda (h) (,(intern (concat "mail-header-" header)) h)))
9196         (case-fold-search t))
9197     (dolist (header gnus-newsgroup-headers)
9198       (when (string-match regexp (funcall func header))
9199         (push (mail-header-number header) articles)))
9200     (nreverse articles)))
9201
9202 (defun gnus-summary-find-matching (header regexp &optional backward unread
9203                                           not-case-fold not-matching)
9204   "Return a list of all articles that match REGEXP on HEADER.
9205 The search stars on the current article and goes forwards unless
9206 BACKWARD is non-nil.  If BACKWARD is `all', do all articles.
9207 If UNREAD is non-nil, only unread articles will
9208 be taken into consideration.  If NOT-CASE-FOLD, case won't be folded
9209 in the comparisons. If NOT-MATCHING, return a list of all articles that
9210 not match REGEXP on HEADER."
9211   (let ((case-fold-search (not not-case-fold))
9212         articles d func)
9213     (if (consp header)
9214         (if (eq (car header) 'extra)
9215             (setq func
9216                   `(lambda (h)
9217                      (or (cdr (assq ',(cdr header) (mail-header-extra h)))
9218                          "")))
9219           (error "%s is an invalid header" header))
9220       (unless (fboundp (intern (concat "mail-header-" header)))
9221         (error "%s is not a valid header" header))
9222       (setq func `(lambda (h) (,(intern (concat "mail-header-" header)) h))))
9223     (dolist (d (if (eq backward 'all)
9224                    gnus-newsgroup-data
9225                  (gnus-data-find-list
9226                   (gnus-summary-article-number)
9227                   (gnus-data-list backward))))
9228       (when (and (or (not unread)       ; We want all articles...
9229                      (gnus-data-unread-p d)) ; Or just unreads.
9230                  (vectorp (gnus-data-header d)) ; It's not a pseudo.
9231                  (if not-matching
9232                      (not (string-match
9233                            regexp
9234                            (funcall func (gnus-data-header d))))
9235                    (string-match regexp
9236                                  (funcall func (gnus-data-header d)))))
9237         (push (gnus-data-number d) articles))) ; Success!
9238     (nreverse articles)))
9239
9240 (defun gnus-summary-execute-command (header regexp command &optional backward)
9241   "Search forward for an article whose HEADER matches REGEXP and execute COMMAND.
9242 If HEADER is an empty string (or nil), the match is done on the entire
9243 article.  If BACKWARD (the prefix) is non-nil, search backward instead."
9244   (interactive
9245    (list (let ((completion-ignore-case t))
9246            (gnus-completing-read
9247             "Header name"
9248             (mapcar 'symbol-name
9249                     (append
9250                      '(Number Subject From Lines Date
9251                        Message-ID Xref References Body)
9252                      gnus-extra-headers))
9253             'require-match))
9254          (read-string "Regexp: ")
9255          (read-key-sequence "Command: ")
9256          current-prefix-arg))
9257   (when (equal header "Body")
9258     (setq header ""))
9259   ;; Hidden thread subtrees must be searched as well.
9260   (gnus-summary-show-all-threads)
9261   ;; We don't want to change current point nor window configuration.
9262   (save-excursion
9263     (save-window-excursion
9264       (let (gnus-visual
9265             gnus-treat-strip-trailing-blank-lines
9266             gnus-treat-strip-leading-blank-lines
9267             gnus-treat-strip-multiple-blank-lines
9268             gnus-treat-hide-boring-headers
9269             gnus-treat-fold-newsgroups
9270             gnus-article-prepare-hook)
9271         (gnus-message 6 "Executing %s..." (key-description command))
9272         ;; We'd like to execute COMMAND interactively so as to give arguments.
9273         (gnus-execute header regexp
9274                       `(call-interactively ',(key-binding command))
9275                       backward)
9276         (gnus-message 6 "Executing %s...done" (key-description command))))))
9277
9278 (defun gnus-summary-beginning-of-article ()
9279   "Scroll the article back to the beginning."
9280   (interactive)
9281   (gnus-summary-select-article)
9282   (gnus-configure-windows 'article)
9283   (gnus-eval-in-buffer-window gnus-article-buffer
9284     (widen)
9285     (goto-char (point-min))
9286     (when gnus-break-pages
9287       (gnus-narrow-to-page))))
9288
9289 (defun gnus-summary-end-of-article ()
9290   "Scroll to the end of the article."
9291   (interactive)
9292   (gnus-summary-select-article)
9293   (gnus-configure-windows 'article)
9294   (gnus-eval-in-buffer-window gnus-article-buffer
9295     (widen)
9296     (goto-char (point-max))
9297     (recenter -3)
9298     (when gnus-break-pages
9299       (gnus-narrow-to-page))))
9300
9301 (defun gnus-summary-print-truncate-and-quote (string &optional len)
9302   "Truncate to LEN and quote all \"(\"'s in STRING."
9303   (gnus-replace-in-string (if (and len (> (length string) len))
9304                               (substring string 0 len)
9305                             string)
9306                           "[()]" "\\\\\\&"))
9307
9308 (defun gnus-summary-print-article (&optional filename n)
9309   "Generate and print a PostScript image of the process-marked (mail) articles.
9310
9311 If used interactively, print the current article if none are
9312 process-marked.  With prefix arg, prompt the user for the name of the
9313 file to save in.
9314
9315 When used from Lisp, accept two optional args FILENAME and N.  N means
9316 to print the next N articles.  If N is negative, print the N previous
9317 articles.  If N is nil and articles have been marked with the process
9318 mark, print these instead.
9319
9320 If the optional first argument FILENAME is nil, send the image to the
9321 printer.  If FILENAME is a string, save the PostScript image in a file with
9322 that name.  If FILENAME is a number, prompt the user for the name of the file
9323 to save in."
9324   (interactive (list (ps-print-preprint current-prefix-arg)))
9325   (dolist (article (gnus-summary-work-articles n))
9326     (gnus-summary-select-article nil nil 'pseudo article)
9327     (gnus-eval-in-buffer-window gnus-article-buffer
9328       (gnus-print-buffer))
9329     (gnus-summary-remove-process-mark article))
9330   (ps-despool filename))
9331
9332 (defun gnus-print-buffer ()
9333   (let ((buffer (generate-new-buffer " *print*")))
9334     (unwind-protect
9335         (progn
9336           (copy-to-buffer buffer (point-min) (point-max))
9337           (set-buffer buffer)
9338           (gnus-remove-text-with-property 'gnus-decoration)
9339           (when (gnus-visual-p 'article-highlight 'highlight)
9340             ;; Copy-to-buffer doesn't copy overlay.  So redo
9341             ;; highlight.
9342             (let ((gnus-article-buffer buffer))
9343               (gnus-article-highlight-citation t)
9344               (gnus-article-highlight-signature)
9345               (gnus-article-emphasize)
9346               (gnus-article-delete-invisible-text)))
9347           (let ((ps-left-header
9348                  (list
9349                   (concat "("
9350                           (gnus-summary-print-truncate-and-quote
9351                            (mail-header-subject gnus-current-headers)
9352                            66) ")")
9353                   (concat "("
9354                           (gnus-summary-print-truncate-and-quote
9355                            (mail-header-from gnus-current-headers)
9356                            45) ")")))
9357                 (ps-right-header
9358                  (list
9359                   "/pagenumberstring load"
9360                   (concat "("
9361                           (mail-header-date gnus-current-headers) ")"))))
9362             (gnus-run-hooks 'gnus-ps-print-hook)
9363             (save-excursion
9364               (if ps-print-color-p
9365                   (ps-spool-buffer-with-faces)
9366                 (ps-spool-buffer)))))
9367       (kill-buffer buffer))))
9368
9369 (defun gnus-summary-show-complete-article ()
9370   "Show a complete version of the current article.
9371 This is only useful if you're looking at a partial version of the
9372 article currently."
9373   (interactive)
9374   (let ((gnus-keep-backlog nil)
9375         (gnus-use-cache nil)
9376         (gnus-agent nil)
9377         (variable (intern
9378                    (format "%s-fetch-partial-articles"
9379                            (car (gnus-find-method-for-group
9380                                  gnus-newsgroup-name)))
9381                    obarray))
9382         old-val)
9383     (unwind-protect
9384         (progn
9385           (setq old-val (symbol-value variable))
9386           (set variable nil)
9387           (gnus-flush-original-article-buffer)
9388           (gnus-summary-show-article))
9389       (set variable old-val))))
9390
9391 (defun gnus-summary-show-article (&optional arg)
9392   "Force redisplaying of the current article.
9393 If ARG (the prefix) is a number, show the article with the charset
9394 defined in `gnus-summary-show-article-charset-alist', or the charset
9395 input.
9396 If ARG (the prefix) is non-nil and not a number, show the raw article
9397 without any article massaging functions being run.  Normally, the key
9398 strokes are `C-u g'."
9399   (interactive "P")
9400   (cond
9401    ((numberp arg)
9402     (gnus-summary-show-article t)
9403     (let ((gnus-newsgroup-charset
9404            (or (cdr (assq arg gnus-summary-show-article-charset-alist))
9405                (mm-read-coding-system
9406                 "View as charset: " ;; actually it is coding system.
9407                 (with-current-buffer gnus-article-buffer
9408                   (mm-detect-coding-region (point) (point-max))))))
9409           (gnus-newsgroup-ignored-charsets 'gnus-all))
9410       (gnus-summary-select-article nil 'force)
9411       (let ((deps gnus-newsgroup-dependencies)
9412             head header lines)
9413         (with-current-buffer gnus-original-article-buffer
9414           (save-restriction
9415             (message-narrow-to-head)
9416             (setq head (buffer-string))
9417             (goto-char (point-min))
9418             (unless (re-search-forward "^lines:[ \t]\\([0-9]+\\)" nil t)
9419               (goto-char (point-max))
9420               (widen)
9421               (setq lines (1- (count-lines (point) (point-max))))))
9422           (with-temp-buffer
9423             (insert (format "211 %d Article retrieved.\n"
9424                             (cdr gnus-article-current)))
9425             (insert head)
9426             (if lines (insert (format "Lines: %d\n" lines)))
9427             (insert ".\n")
9428             (let ((nntp-server-buffer (current-buffer)))
9429               (setq header (car (gnus-get-newsgroup-headers deps t))))))
9430         (gnus-data-set-header
9431          (gnus-data-find (cdr gnus-article-current))
9432          header)
9433         (gnus-summary-update-article-line
9434          (cdr gnus-article-current) header)
9435         (when (gnus-summary-goto-subject (cdr gnus-article-current) nil t)
9436           (gnus-summary-update-secondary-mark (cdr gnus-article-current))))))
9437    ((not arg)
9438     ;; Select the article the normal way.
9439     (gnus-summary-select-article nil 'force))
9440    (t
9441     ;; We have to require this here to make sure that the following
9442     ;; dynamic binding isn't shadowed by autoloading.
9443     (require 'gnus-async)
9444     (require 'gnus-art)
9445     ;; Bind the article treatment functions to nil.
9446     (let ((gnus-have-all-headers t)
9447           gnus-article-prepare-hook
9448           gnus-article-decode-hook
9449           gnus-display-mime-function
9450           gnus-break-pages)
9451       ;; Destroy any MIME parts.
9452       (when (gnus-buffer-live-p gnus-article-buffer)
9453         (with-current-buffer gnus-article-buffer
9454           (mm-destroy-parts gnus-article-mime-handles)
9455           ;; Set it to nil for safety reason.
9456           (setq gnus-article-mime-handle-alist nil)
9457           (setq gnus-article-mime-handles nil)))
9458       (gnus-summary-select-article nil 'force))))
9459   (gnus-summary-goto-subject gnus-current-article)
9460   (gnus-summary-position-point))
9461
9462 (defun gnus-summary-show-raw-article ()
9463   "Show the raw article without any article massaging functions being run."
9464   (interactive)
9465   (gnus-summary-show-article t))
9466
9467 (defun gnus-summary-verbose-headers (&optional arg)
9468   "Toggle permanent full header display.
9469 If ARG is a positive number, turn header display on.
9470 If ARG is a negative number, turn header display off."
9471   (interactive "P")
9472   (setq gnus-show-all-headers
9473         (cond ((or (not (numberp arg))
9474                    (zerop arg))
9475                (not gnus-show-all-headers))
9476               ((natnump arg)
9477                t)))
9478   (gnus-summary-show-article))
9479
9480 (defun gnus-summary-toggle-header (&optional arg)
9481   "Show the headers if they are hidden, or hide them if they are shown.
9482 If ARG is a positive number, show the entire header.
9483 If ARG is a negative number, hide the unwanted header lines."
9484   (interactive "P")
9485   (let ((window (and (gnus-buffer-live-p gnus-article-buffer)
9486                      (get-buffer-window gnus-article-buffer t))))
9487     (with-current-buffer gnus-article-buffer
9488       (widen)
9489       (article-narrow-to-head)
9490       (let* ((inhibit-read-only t)
9491              (inhibit-point-motion-hooks t)
9492              (hidden (if (numberp arg)
9493                          (>= arg 0)
9494                        (or (not (looking-at "[^ \t\n]+:"))
9495                            (gnus-article-hidden-text-p 'headers))))
9496              s e)
9497         (delete-region (point-min) (point-max))
9498         (with-current-buffer gnus-original-article-buffer
9499           (goto-char (setq s (point-min)))
9500           (setq e (if (search-forward "\n\n" nil t)
9501                       (1- (point))
9502                     (point-max))))
9503         (insert-buffer-substring gnus-original-article-buffer s e)
9504         (run-hooks 'gnus-article-decode-hook)
9505         (if hidden
9506             (let ((gnus-treat-hide-headers nil)
9507                   (gnus-treat-hide-boring-headers nil))
9508               (gnus-delete-wash-type 'headers)
9509               (gnus-treat-article 'head))
9510           (gnus-treat-article 'head))
9511         (widen)
9512         (if window
9513             (set-window-start window (goto-char (point-min))))
9514         (if gnus-break-pages
9515             (gnus-narrow-to-page)
9516           (when (gnus-visual-p 'page-marker)
9517             (let ((inhibit-read-only t))
9518               (gnus-remove-text-with-property 'gnus-prev)
9519               (gnus-remove-text-with-property 'gnus-next))))
9520         (gnus-set-mode-line 'article)))))
9521
9522 (defun gnus-summary-show-all-headers ()
9523   "Make all header lines visible."
9524   (interactive)
9525   (gnus-summary-toggle-header 1))
9526
9527 (defun gnus-summary-caesar-message (&optional arg)
9528   "Caesar rotate the current article by 13.
9529 With a non-numerical prefix, also rotate headers.  A numerical
9530 prefix specifies how many places to rotate each letter forward."
9531   (interactive "P")
9532   (gnus-summary-select-article)
9533   (let ((mail-header-separator ""))
9534     (gnus-eval-in-buffer-window gnus-article-buffer
9535       (save-restriction
9536         (widen)
9537         (let ((start (window-start))
9538               (inhibit-read-only t))
9539           (if (equal arg '(4))
9540               (message-caesar-buffer-body nil t)
9541             (message-caesar-buffer-body arg))
9542           (set-window-start (get-buffer-window (current-buffer)) start)))))
9543   ;; Create buttons and stuff...
9544   (gnus-treat-article nil))
9545
9546 (declare-function idna-to-unicode "ext:idna" (str))
9547
9548 (defun gnus-summary-idna-message (&optional arg)
9549   "Decode IDNA encoded domain names in the current articles.
9550 IDNA encoded domain names looks like `xn--bar'.  If a string
9551 remain unencoded after running this function, it is likely an
9552 invalid IDNA string (`xn--bar' is invalid).
9553
9554 You must have GNU Libidn (URL `http://www.gnu.org/software/libidn/')
9555 installed for this command to work."
9556   (interactive "P")
9557   (if (not (and (condition-case nil (require 'idna)
9558                   (file-error))
9559                 (mm-coding-system-p 'utf-8)
9560                 (executable-find (symbol-value 'idna-program))))
9561       (gnus-message
9562        5 "GNU Libidn not installed properly (`idn' or `idna.el' missing)")
9563     (gnus-summary-select-article)
9564     (let ((mail-header-separator ""))
9565       (gnus-eval-in-buffer-window gnus-article-buffer
9566         (save-restriction
9567           (widen)
9568           (let ((start (window-start))
9569                 buffer-read-only)
9570             (while (re-search-forward "\\(xn--[-0-9a-z]+\\)" nil t)
9571               (replace-match (idna-to-unicode (match-string 1))))
9572             (set-window-start (get-buffer-window (current-buffer)) start)))))))
9573
9574 (defun gnus-summary-morse-message (&optional arg)
9575   "Morse decode the current article."
9576   (interactive "P")
9577   (gnus-summary-select-article)
9578   (let ((mail-header-separator ""))
9579     (gnus-eval-in-buffer-window gnus-article-buffer
9580       (save-excursion
9581         (save-restriction
9582           (widen)
9583           (let ((pos (window-start))
9584                 (inhibit-read-only t))
9585             (goto-char (point-min))
9586             (when (message-goto-body)
9587               (gnus-narrow-to-body))
9588             (goto-char (point-min))
9589             (while (search-forward "·" (point-max) t)
9590               (replace-match "."))
9591             (unmorse-region (point-min) (point-max))
9592             (widen)
9593             (set-window-start (get-buffer-window (current-buffer)) pos)))))))
9594
9595 (defun gnus-summary-stop-page-breaking ()
9596   "Stop page breaking in the current article."
9597   (interactive)
9598   (gnus-summary-select-article)
9599   (gnus-eval-in-buffer-window gnus-article-buffer
9600     (widen)
9601     (when (gnus-visual-p 'page-marker)
9602       (let ((inhibit-read-only t))
9603         (gnus-remove-text-with-property 'gnus-prev)
9604         (gnus-remove-text-with-property 'gnus-next))
9605       (setq gnus-page-broken nil))))
9606
9607 (defun gnus-summary-move-article (&optional n to-newsgroup
9608                                             select-method action)
9609   "Move the current article to a different newsgroup.
9610 If N is a positive number, move the N next articles.
9611 If N is a negative number, move the N previous articles.
9612 If N is nil and any articles have been marked with the process mark,
9613 move those articles instead.
9614 If TO-NEWSGROUP is string, do not prompt for a newsgroup to move to.
9615 If SELECT-METHOD is non-nil, do not move to a specific newsgroup, but
9616 re-spool using this method.
9617
9618 When called interactively with TO-NEWSGROUP being nil, the value of
9619 the variable `gnus-move-split-methods' is used for finding a default
9620 for the target newsgroup.
9621
9622 For this function to work, both the current newsgroup and the
9623 newsgroup that you want to move to have to support the `request-move'
9624 and `request-accept' functions.
9625
9626 ACTION can be either `move' (the default), `crosspost' or `copy'."
9627   (interactive "P")
9628   (unless action
9629     (setq action 'move))
9630   ;; Check whether the source group supports the required functions.
9631   (cond ((and (eq action 'move)
9632               (not (gnus-check-backend-function
9633                     'request-move-article gnus-newsgroup-name)))
9634          (error "The current group does not support article moving"))
9635         ((and (eq action 'crosspost)
9636               (not (gnus-check-backend-function
9637                     'request-replace-article gnus-newsgroup-name)))
9638          (error "The current group does not support article editing")))
9639   (let ((articles (gnus-summary-work-articles n))
9640         (prefix (if (gnus-check-backend-function
9641                      'request-move-article gnus-newsgroup-name)
9642                     (funcall gnus-move-group-prefix-function
9643                              gnus-newsgroup-name)
9644                   ""))
9645         (names '((move "Move" "Moving")
9646                  (copy "Copy" "Copying")
9647                  (crosspost "Crosspost" "Crossposting")))
9648         (copy-buf (save-excursion
9649                     (nnheader-set-temp-buffer " *copy article*")))
9650         art-group to-method new-xref article to-groups
9651         articles-to-update-marks encoded)
9652     (unless (assq action names)
9653       (error "Unknown action %s" action))
9654     ;; Read the newsgroup name.
9655     (when (and (not to-newsgroup)
9656                (not select-method))
9657       (if (and gnus-move-split-methods
9658                (not
9659                 (and (memq gnus-current-article articles)
9660                      (gnus-buffer-live-p gnus-original-article-buffer))))
9661           ;; When `gnus-move-split-methods' is non-nil, we have to
9662           ;; select an article to give `gnus-read-move-group-name' an
9663           ;; opportunity to suggest an appropriate default.  However,
9664           ;; we needn't render or mark the article.
9665           (let ((gnus-display-mime-function nil)
9666                 (gnus-article-prepare-hook nil)
9667                 (gnus-mark-article-hook nil))
9668             (gnus-summary-select-article nil nil nil (car articles))))
9669       (setq to-newsgroup (gnus-read-move-group-name
9670                           (cadr (assq action names))
9671                           (symbol-value
9672                            (intern (format "gnus-current-%s-group" action)))
9673                           articles prefix)
9674             encoded to-newsgroup
9675             to-method (gnus-server-to-method (gnus-group-method to-newsgroup)))
9676       (set (intern (format "gnus-current-%s-group" action))
9677            (mm-decode-coding-string
9678             to-newsgroup
9679             (gnus-group-name-charset to-method to-newsgroup))))
9680     (unless to-method
9681       (setq to-method (or select-method
9682                           (gnus-server-to-method
9683                            (gnus-group-method to-newsgroup)))))
9684     (setq to-newsgroup
9685           (or encoded
9686               (and to-newsgroup
9687                    (mm-encode-coding-string
9688                     to-newsgroup
9689                     (gnus-group-name-charset to-method to-newsgroup)))))
9690     ;; Check the method we are to move this article to...
9691     (unless (gnus-check-backend-function
9692              'request-accept-article (car to-method))
9693       (error "%s does not support article copying" (car to-method)))
9694     (unless (gnus-check-server to-method)
9695       (error "Can't open server %s" (car to-method)))
9696     (gnus-message 6 "%s to %s: %s..."
9697                   (caddr (assq action names))
9698                   (or (car select-method)
9699                       (gnus-group-decoded-name to-newsgroup))
9700                   articles)
9701     (while articles
9702       (setq article (pop articles))
9703       (setq
9704        art-group
9705        (cond
9706         ;; Move the article.
9707         ((eq action 'move)
9708          ;; Remove this article from future suppression.
9709          (gnus-dup-unsuppress-article article)
9710          (let* ((from-method (gnus-find-method-for-group
9711                               gnus-newsgroup-name))
9712                 (to-method (or select-method
9713                                (gnus-find-method-for-group to-newsgroup)))
9714                 (move-is-internal (gnus-server-equal from-method to-method)))
9715            (gnus-request-move-article
9716             article                     ; Article to move
9717             gnus-newsgroup-name         ; From newsgroup
9718             (nth 1 (gnus-find-method-for-group
9719                     gnus-newsgroup-name)) ; Server
9720             (list 'gnus-request-accept-article
9721                   to-newsgroup (list 'quote select-method)
9722                   (not articles) t)     ; Accept form
9723             (not articles)              ; Only save nov last time
9724             (and move-is-internal
9725                  to-newsgroup           ; Not respooling
9726                  (gnus-group-real-name to-newsgroup))))) ; Is this move internal?
9727         ;; Copy the article.
9728         ((eq action 'copy)
9729          (with-current-buffer copy-buf
9730            (when (gnus-request-article-this-buffer article gnus-newsgroup-name)
9731              (save-restriction
9732                (nnheader-narrow-to-headers)
9733                (dolist (hdr gnus-copy-article-ignored-headers)
9734                  (message-remove-header hdr t)))
9735              (gnus-request-accept-article
9736               to-newsgroup select-method (not articles) t))))
9737         ;; Crosspost the article.
9738         ((eq action 'crosspost)
9739          (let ((xref (message-tokenize-header
9740                       (mail-header-xref (gnus-summary-article-header article))
9741                       " ")))
9742            (setq new-xref (concat (gnus-group-real-name gnus-newsgroup-name)
9743                                   ":" (number-to-string article)))
9744            (unless xref
9745              (setq xref (list (system-name))))
9746            (setq new-xref
9747                  (concat
9748                   (mapconcat 'identity
9749                              (delete "Xref:" (delete new-xref xref))
9750                              " ")
9751                   " " new-xref))
9752            (with-current-buffer copy-buf
9753              ;; First put the article in the destination group.
9754              (gnus-request-article-this-buffer article gnus-newsgroup-name)
9755              (when (consp (setq art-group
9756                                 (gnus-request-accept-article
9757                                  to-newsgroup select-method (not articles) t)))
9758                (setq new-xref (concat new-xref " " (car art-group)
9759                                       ":"
9760                                       (number-to-string (cdr art-group))))
9761                ;; Now we have the new Xrefs header, so we insert
9762                ;; it and replace the new article.
9763                (nnheader-replace-header "Xref" new-xref)
9764                (gnus-request-replace-article
9765                 (cdr art-group) to-newsgroup (current-buffer) t)
9766                art-group))))))
9767       (cond
9768        ((not art-group)
9769         (gnus-message 1 "Couldn't %s article %s: %s"
9770                       (cadr (assq action names)) article
9771                       (nnheader-get-report (car to-method))))
9772        ((eq art-group 'junk)
9773         (when (eq action 'move)
9774           (gnus-summary-mark-article article gnus-canceled-mark)
9775           (gnus-message 4 "Deleted article %s" article)
9776           ;; run the delete hook
9777           (run-hook-with-args 'gnus-summary-article-delete-hook
9778                               action
9779                               (gnus-data-header
9780                                (assoc article (gnus-data-list nil)))
9781                               gnus-newsgroup-name nil
9782                               select-method)))
9783        (t
9784         (let* ((pto-group (gnus-group-prefixed-name
9785                            (car art-group) to-method))
9786                (info (gnus-get-info pto-group))
9787                (to-group (gnus-info-group info))
9788                to-marks)
9789           ;; Update the group that has been moved to.
9790           (when (and info
9791                      (memq action '(move copy)))
9792             (unless (member to-group to-groups)
9793               (push to-group to-groups))
9794
9795             (unless (memq article gnus-newsgroup-unreads)
9796               (push 'read to-marks)
9797               (gnus-info-set-read
9798                info (gnus-add-to-range (gnus-info-read info)
9799                                        (list (cdr art-group)))))
9800
9801             ;; See whether the article is to be put in the cache.
9802             (let* ((expirable (gnus-group-auto-expirable-p to-group))
9803                    (marks (if expirable
9804                               gnus-article-mark-lists
9805                             (delete '(expirable . expire)
9806                                     (copy-sequence gnus-article-mark-lists))))
9807                    (to-article (cdr art-group)))
9808
9809               ;; Enter the article into the cache in the new group,
9810               ;; if that is required.
9811               (when gnus-use-cache
9812                 (gnus-cache-possibly-enter-article
9813                  to-group to-article
9814                  (memq article gnus-newsgroup-marked)
9815                  (memq article gnus-newsgroup-dormant)
9816                  (memq article gnus-newsgroup-unreads)))
9817
9818               (when gnus-preserve-marks
9819                 ;; Copy any marks over to the new group.
9820                 (when (and (equal to-group gnus-newsgroup-name)
9821                            (not (memq article gnus-newsgroup-unreads)))
9822                   ;; Mark this article as read in this group.
9823                   (push (cons to-article gnus-read-mark) gnus-newsgroup-reads)
9824                   ;; Increase the active status of this group.
9825                   (setcdr (gnus-active to-group) to-article)
9826                   (setcdr gnus-newsgroup-active to-article))
9827
9828                 (while marks
9829                   (when (eq (gnus-article-mark-to-type (cdar marks)) 'list)
9830                     (when (memq article (symbol-value
9831                                          (intern (format "gnus-newsgroup-%s"
9832                                                          (caar marks)))))
9833                       (push (cdar marks) to-marks)
9834                       ;; If the other group is the same as this group,
9835                       ;; then we have to add the mark to the list.
9836                       (when (equal to-group gnus-newsgroup-name)
9837                         (set (intern (format "gnus-newsgroup-%s" (caar marks)))
9838                              (cons to-article
9839                                    (symbol-value
9840                                     (intern (format "gnus-newsgroup-%s"
9841                                                     (caar marks)))))))
9842                       ;; Copy the marks to other group.
9843                       (gnus-add-marked-articles
9844                        to-group (cdar marks) (list to-article) info)))
9845                   (setq marks (cdr marks)))
9846
9847                 (when (and expirable
9848                            gnus-mark-copied-or-moved-articles-as-expirable
9849                            (not (memq 'expire to-marks)))
9850                   ;; Mark this article as expirable.
9851                   (push 'expire to-marks)
9852                   (when (equal to-group gnus-newsgroup-name)
9853                     (push to-article gnus-newsgroup-expirable))
9854                   ;; Copy the expirable mark to other group.
9855                   (gnus-add-marked-articles
9856                    to-group 'expire (list to-article) info))
9857
9858                 (when to-marks
9859                   (gnus-request-set-mark
9860                    to-group (list (list (list to-article) 'add to-marks)))))
9861
9862               (gnus-dribble-enter
9863                (concat "(gnus-group-set-info '"
9864                        (gnus-prin1-to-string (gnus-get-info to-group))
9865                        ")"))))
9866
9867           ;; Update the Xref header in this article to point to
9868           ;; the new crossposted article we have just created.
9869           (when (eq action 'crosspost)
9870             (with-current-buffer copy-buf
9871               (gnus-request-article-this-buffer article gnus-newsgroup-name)
9872               (nnheader-replace-header "Xref" new-xref)
9873               (gnus-request-replace-article
9874                article gnus-newsgroup-name (current-buffer) t)))
9875
9876           ;; run the move/copy/crosspost/respool hook
9877           (run-hook-with-args 'gnus-summary-article-move-hook
9878                               action
9879                               (gnus-data-header
9880                                (assoc article (gnus-data-list nil)))
9881                               gnus-newsgroup-name
9882                               to-newsgroup
9883                               select-method))
9884
9885         ;;;!!!Why is this necessary?
9886         (set-buffer gnus-summary-buffer)
9887
9888         (when (eq action 'move)
9889           (save-excursion
9890             (gnus-summary-goto-subject article)
9891             (gnus-summary-mark-article article gnus-canceled-mark)))))
9892       (push article articles-to-update-marks))
9893
9894     (save-excursion
9895       (apply 'gnus-summary-remove-process-mark articles-to-update-marks))
9896     ;; Re-activate all groups that have been moved to.
9897     (with-current-buffer gnus-group-buffer
9898       (let ((gnus-group-marked to-groups))
9899         (gnus-group-get-new-news-this-group nil t)))
9900
9901     (gnus-kill-buffer copy-buf)
9902     (gnus-summary-position-point)
9903     (gnus-set-mode-line 'summary)))
9904
9905 (defun gnus-summary-copy-article (&optional n to-newsgroup select-method)
9906   "Copy the current article to some other group.
9907 If TO-NEWSGROUP is string, do not prompt for a newsgroup to copy to.
9908 When called interactively, if TO-NEWSGROUP is nil, use the value of
9909 the variable `gnus-move-split-methods' for finding a default target
9910 newsgroup.
9911 If SELECT-METHOD is non-nil, do not move to a specific newsgroup, but
9912 re-spool using this method."
9913   (interactive "P")
9914   (gnus-summary-move-article n to-newsgroup select-method 'copy))
9915
9916 (defun gnus-summary-crosspost-article (&optional n)
9917   "Crosspost the current article to some other group."
9918   (interactive "P")
9919   (gnus-summary-move-article n nil nil 'crosspost))
9920
9921 (defcustom gnus-summary-respool-default-method nil
9922   "Default method type for respooling an article.
9923 If nil, use to the current newsgroup method."
9924   :type 'symbol
9925   :group 'gnus-summary-mail)
9926
9927 (defun gnus-summary-respool-article (&optional n method)
9928   "Respool the current article.
9929 The article will be squeezed through the mail spooling process again,
9930 which means that it will be put in some mail newsgroup or other
9931 depending on `nnmail-split-methods'.
9932 If N is a positive number, respool the N next articles.
9933 If N is a negative number, respool the N previous articles.
9934 If N is nil and any articles have been marked with the process mark,
9935 respool those articles instead.
9936
9937 Respooling can be done both from mail groups and \"real\" newsgroups.
9938 In the former case, the articles in question will be moved from the
9939 current group into whatever groups they are destined to.  In the
9940 latter case, they will be copied into the relevant groups."
9941   (interactive
9942    (list current-prefix-arg
9943          (let* ((methods (gnus-methods-using 'respool))
9944                 (methname
9945                  (symbol-name (or gnus-summary-respool-default-method
9946                                   (car (gnus-find-method-for-group
9947                                         gnus-newsgroup-name)))))
9948                 (method
9949                  (gnus-completing-read
9950                   "Backend to use when respooling"
9951                   methods t nil 'gnus-mail-method-history methname))
9952                 ms)
9953            (cond
9954             ((zerop (length (setq ms (gnus-servers-using-backend
9955                                       (intern method)))))
9956              (list (intern method) ""))
9957             ((= 1 (length ms))
9958              (car ms))
9959             (t
9960              (let ((ms-alist (mapcar (lambda (m) (cons (cadr m) m)) ms)))
9961                (cdr (assoc (gnus-completing-read "Server name" ms-alist t)
9962                            ms-alist))))))))
9963   (unless method
9964     (error "No method given for respooling"))
9965   (if (assoc (symbol-name
9966               (car (gnus-find-method-for-group gnus-newsgroup-name)))
9967              (gnus-methods-using 'respool))
9968       (gnus-summary-move-article n nil method)
9969     (gnus-summary-copy-article n nil method)))
9970
9971 (defun gnus-summary-import-article (file &optional edit)
9972   "Import an arbitrary file into a mail newsgroup."
9973   (interactive "fImport file: \nP")
9974   (let ((group gnus-newsgroup-name)
9975         (now (current-time))
9976         atts lines group-art)
9977     (unless (gnus-check-backend-function 'request-accept-article group)
9978       (error "%s does not support article importing" group))
9979     (or (file-readable-p file)
9980         (not (file-regular-p file))
9981         (error "Can't read %s" file))
9982     (with-current-buffer (gnus-get-buffer-create " *import file*")
9983       (erase-buffer)
9984       (nnheader-insert-file-contents file)
9985       (goto-char (point-min))
9986       (if (nnheader-article-p)
9987           (save-restriction
9988             (goto-char (point-min))
9989             (search-forward "\n\n" nil t)
9990             (narrow-to-region (point-min) (1- (point)))
9991             (goto-char (point-min))
9992             (unless (re-search-forward "^date:" nil t)
9993               (goto-char (point-max))
9994               (insert "Date: " (message-make-date (nth 5 atts)) "\n")))
9995        ;; This doesn't look like an article, so we fudge some headers.
9996         (setq atts (file-attributes file)
9997               lines (count-lines (point-min) (point-max)))
9998         (insert "From: " (read-string "From: ") "\n"
9999                 "Subject: " (read-string "Subject: ") "\n"
10000                 "Date: " (message-make-date (nth 5 atts)) "\n"
10001                 "Message-ID: " (message-make-message-id) "\n"
10002                 "Lines: " (int-to-string lines) "\n"
10003                 "Chars: " (int-to-string (nth 7 atts)) "\n\n"))
10004       (setq group-art (gnus-request-accept-article group nil t))
10005       (kill-buffer (current-buffer)))
10006     (setq gnus-newsgroup-active (gnus-activate-group group))
10007     (forward-line 1)
10008     (gnus-summary-goto-article (cdr group-art) nil t)
10009     (when edit
10010       (gnus-summary-edit-article))))
10011
10012 (defun gnus-summary-create-article ()
10013   "Create an article in a mail newsgroup."
10014   (interactive)
10015   (let ((group gnus-newsgroup-name)
10016         (now (current-time))
10017         group-art)
10018     (unless (gnus-check-backend-function 'request-accept-article group)
10019       (error "%s does not support article importing" group))
10020     (with-current-buffer (gnus-get-buffer-create " *import file*")
10021       (erase-buffer)
10022       (goto-char (point-min))
10023       ;; This doesn't look like an article, so we fudge some headers.
10024       (insert "From: " (read-string "From: ") "\n"
10025               "Subject: " (read-string "Subject: ") "\n"
10026               "Date: " (message-make-date now) "\n"
10027               "Message-ID: " (message-make-message-id) "\n")
10028       (setq group-art (gnus-request-accept-article group nil t))
10029       (kill-buffer (current-buffer)))
10030     (setq gnus-newsgroup-active (gnus-activate-group group))
10031     (forward-line 1)
10032     (gnus-summary-goto-article (cdr group-art) nil t)
10033     (gnus-summary-edit-article)))
10034
10035 (defun gnus-summary-article-posted-p ()
10036   "Say whether the current (mail) article is available from news as well.
10037 This will be the case if the article has both been mailed and posted."
10038   (interactive)
10039   (let ((id (mail-header-references (gnus-summary-article-header)))
10040         (gnus-override-method (car (gnus-refer-article-methods))))
10041     (if (gnus-request-head id "")
10042         (gnus-message 2 "The current message was found on %s"
10043                       gnus-override-method)
10044       (gnus-message 2 "The current message couldn't be found on %s"
10045                     gnus-override-method)
10046       nil)))
10047
10048 (defun gnus-summary-expire-articles (&optional now)
10049   "Expire all articles that are marked as expirable in the current group."
10050   (interactive)
10051   (when (and (not gnus-group-is-exiting-without-update-p)
10052              (gnus-check-backend-function
10053               'request-expire-articles gnus-newsgroup-name))
10054     ;; This backend supports expiry.
10055     (let* ((total (gnus-group-total-expirable-p gnus-newsgroup-name))
10056            (expirable (if total
10057                           (progn
10058                             ;; We need to update the info for
10059                             ;; this group for `gnus-list-of-read-articles'
10060                             ;; to give us the right answer.
10061                             (gnus-run-hooks 'gnus-exit-group-hook)
10062                             (gnus-summary-update-info)
10063                             (gnus-list-of-read-articles gnus-newsgroup-name))
10064                         (setq gnus-newsgroup-expirable
10065                               (sort gnus-newsgroup-expirable '<))))
10066            (expiry-wait (if now 'immediate
10067                           (gnus-group-find-parameter
10068                            gnus-newsgroup-name 'expiry-wait)))
10069            (nnmail-expiry-target
10070             (or (gnus-group-find-parameter gnus-newsgroup-name 'expiry-target)
10071                 nnmail-expiry-target))
10072            es)
10073       (when expirable
10074         ;; There are expirable articles in this group, so we run them
10075         ;; through the expiry process.
10076         (gnus-message 6 "Expiring articles...")
10077         (unless (gnus-check-group gnus-newsgroup-name)
10078           (error "Can't open server for %s" gnus-newsgroup-name))
10079         ;; The list of articles that weren't expired is returned.
10080         (save-excursion
10081           (if expiry-wait
10082               (let ((nnmail-expiry-wait-function nil)
10083                     (nnmail-expiry-wait expiry-wait))
10084                 (setq es (gnus-request-expire-articles
10085                           expirable gnus-newsgroup-name)))
10086             (setq es (gnus-request-expire-articles
10087                       expirable gnus-newsgroup-name)))
10088           (unless total
10089             (setq gnus-newsgroup-expirable es))
10090           ;; We go through the old list of expirable, and mark all
10091           ;; really expired articles as nonexistent.
10092           (unless (eq es expirable) ;If nothing was expired, we don't mark.
10093             (let ((gnus-use-cache nil))
10094               (dolist (article expirable)
10095                 (when (and (not (memq article es))
10096                            (gnus-data-find article))
10097                   (gnus-summary-mark-article article gnus-canceled-mark)
10098                   (run-hook-with-args 'gnus-summary-article-expire-hook
10099                                       'delete
10100                                       (gnus-data-header
10101                                        (assoc article (gnus-data-list nil)))
10102                                       gnus-newsgroup-name
10103                                       nil
10104                                       nil))))))
10105         (gnus-message 6 "Expiring articles...done")))))
10106
10107 (defun gnus-summary-expire-articles-now ()
10108   "Expunge all expirable articles in the current group.
10109 This means that *all* articles that are marked as expirable will be
10110 deleted forever, right now."
10111   (interactive)
10112   (or gnus-expert-user
10113       (gnus-yes-or-no-p
10114        "Are you really, really sure you want to delete all expirable messages? ")
10115       (error "Phew!"))
10116   (gnus-summary-expire-articles t))
10117
10118 ;; Suggested by Jack Vinson <vinson@unagi.cis.upenn.edu>.
10119 (defun gnus-summary-delete-article (&optional n)
10120   "Delete the N next (mail) articles.
10121 This command actually deletes articles.  This is not a marking
10122 command.  The article will disappear forever from your life, never to
10123 return.
10124
10125 If N is negative, delete backwards.
10126 If N is nil and articles have been marked with the process mark,
10127 delete these instead.
10128
10129 If `gnus-novice-user' is non-nil you will be asked for
10130 confirmation before the articles are deleted."
10131   (interactive "P")
10132   (unless (gnus-check-backend-function 'request-expire-articles
10133                                        gnus-newsgroup-name)
10134     (error "The current newsgroup does not support article deletion"))
10135   (unless (gnus-check-server (gnus-find-method-for-group gnus-newsgroup-name))
10136     (error "Couldn't open server"))
10137   ;; Compute the list of articles to delete.
10138   (let ((articles (sort (copy-sequence (gnus-summary-work-articles n)) '<))
10139         (nnmail-expiry-target 'delete)
10140         not-deleted)
10141     (if (and gnus-novice-user
10142              (not (gnus-yes-or-no-p
10143                    (format "Do you really want to delete %s forever? "
10144                            (if (> (length articles) 1)
10145                                (format "these %s articles" (length articles))
10146                              "this article")))))
10147         ()
10148       ;; Delete the articles.
10149       (setq not-deleted (gnus-request-expire-articles
10150                          articles gnus-newsgroup-name 'force))
10151       (save-excursion
10152         (while articles
10153           (gnus-summary-remove-process-mark (car articles))
10154           ;; The backend might not have been able to delete the article
10155           ;; after all.
10156           (unless (memq (car articles) not-deleted)
10157             (gnus-summary-mark-article (car articles) gnus-canceled-mark))
10158           (let* ((article (car articles))
10159                  (ghead  (gnus-data-header
10160                           (assoc article (gnus-data-list nil)))))
10161             (run-hook-with-args 'gnus-summary-article-delete-hook
10162                                 'delete ghead gnus-newsgroup-name nil
10163                                 nil))
10164           (setq articles (cdr articles))))
10165       (when not-deleted
10166         (gnus-message 4 "Couldn't delete articles %s" not-deleted)))
10167     (gnus-summary-position-point)
10168     (gnus-set-mode-line 'summary)
10169     not-deleted))
10170
10171 (defun gnus-summary-edit-article (&optional arg)
10172   "Edit the current article.
10173 This will have permanent effect only in mail groups.
10174 If ARG is nil, edit the decoded articles.
10175 If ARG is 1, edit the raw articles.
10176 If ARG is 2, edit the raw articles even in read-only groups.
10177 If ARG is 3, edit the articles with the current handles.
10178 Otherwise, allow editing of articles even in read-only
10179 groups."
10180   (interactive "P")
10181   (let (force raw current-handles)
10182     (cond
10183      ((null arg))
10184      ((eq arg 1)
10185       (setq raw t))
10186      ((eq arg 2)
10187       (setq raw t
10188             force t))
10189      ((eq arg 3)
10190       (setq current-handles
10191             (and (gnus-buffer-live-p gnus-article-buffer)
10192                  (with-current-buffer gnus-article-buffer
10193                    (prog1
10194                        gnus-article-mime-handles
10195                      (setq gnus-article-mime-handles nil))))))
10196      (t
10197       (setq force t)))
10198     (when (and raw (not force)
10199                (member gnus-newsgroup-name '("nndraft:delayed"
10200                                              "nndraft:drafts"
10201                                              "nndraft:queue")))
10202       (error "Can't edit the raw article in group %s"
10203              gnus-newsgroup-name))
10204     (with-current-buffer gnus-summary-buffer
10205       (let ((mail-parse-charset gnus-newsgroup-charset)
10206             (mail-parse-ignored-charsets gnus-newsgroup-ignored-charsets))
10207         (gnus-set-global-variables)
10208         (when (and (not force)
10209                    (gnus-group-read-only-p))
10210           (error "The current newsgroup does not support article editing"))
10211         (gnus-summary-show-article t)
10212         (when (and (not raw) (gnus-buffer-live-p gnus-article-buffer))
10213           (with-current-buffer gnus-article-buffer
10214             (mm-enable-multibyte)))
10215         (if (member gnus-newsgroup-name '("nndraft:delayed" "nndraft:drafts"))
10216             (setq raw t))
10217         (gnus-article-edit-article
10218          (if raw 'ignore
10219            `(lambda ()
10220               (let ((mbl mml-buffer-list))
10221                 (setq mml-buffer-list nil)
10222                 (let ((rfc2047-quote-decoded-words-containing-tspecials t))
10223                   (mime-to-mml ,'current-handles))
10224                 (let ((mbl1 mml-buffer-list))
10225                   (setq mml-buffer-list mbl)
10226                   (set (make-local-variable 'mml-buffer-list) mbl1))
10227                 (gnus-make-local-hook 'kill-buffer-hook)
10228                 (add-hook 'kill-buffer-hook 'mml-destroy-buffers t t))))
10229          `(lambda (no-highlight)
10230             (let ((mail-parse-charset ',gnus-newsgroup-charset)
10231                   (message-options message-options)
10232                   (message-options-set-recipient)
10233                   (mail-parse-ignored-charsets
10234                    ',gnus-newsgroup-ignored-charsets)
10235                   (rfc2047-header-encoding-alist
10236                    ',(let ((charset (gnus-group-name-charset
10237                                      (gnus-find-method-for-group
10238                                       gnus-newsgroup-name)
10239                                      gnus-newsgroup-name)))
10240                        (append (list (cons "Newsgroups" charset)
10241                                      (cons "Followup-To" charset)
10242                                      (cons "Xref" charset))
10243                                rfc2047-header-encoding-alist))))
10244               ,(if (not raw) '(progn
10245                                 (mml-to-mime)
10246                                 (mml-destroy-buffers)
10247                                 (remove-hook 'kill-buffer-hook
10248                                              'mml-destroy-buffers t)
10249                                 (kill-local-variable 'mml-buffer-list)))
10250               (gnus-summary-edit-article-done
10251                ,(or (mail-header-references gnus-current-headers) "")
10252                ,(gnus-group-read-only-p)
10253                ,gnus-summary-buffer no-highlight))))))))
10254
10255 (defalias 'gnus-summary-edit-article-postpone 'gnus-article-edit-exit)
10256
10257 (defun gnus-summary-edit-article-done (&optional references read-only buffer
10258                                                  no-highlight)
10259   "Make edits to the current article permanent."
10260   (interactive)
10261   (save-excursion
10262     ;; The buffer restriction contains the entire article if it exists.
10263     (when (article-goto-body)
10264       (let ((lines (count-lines (point) (point-max)))
10265             (length (- (point-max) (point)))
10266             (case-fold-search t)
10267             (body (copy-marker (point))))
10268         (goto-char (point-min))
10269         (when (re-search-forward "^content-length:[ \t]\\([0-9]+\\)" body t)
10270           (delete-region (match-beginning 1) (match-end 1))
10271           (insert (number-to-string length)))
10272         (goto-char (point-min))
10273         (when (re-search-forward
10274                "^x-content-length:[ \t]\\([0-9]+\\)" body t)
10275           (delete-region (match-beginning 1) (match-end 1))
10276           (insert (number-to-string length)))
10277         (goto-char (point-min))
10278         (when (re-search-forward "^lines:[ \t]\\([0-9]+\\)" body t)
10279           (delete-region (match-beginning 1) (match-end 1))
10280           (insert (number-to-string lines))))))
10281   ;; Replace the article.
10282   (let ((buf (current-buffer))
10283         (article (cdr gnus-article-current))
10284         replace-result)
10285     (with-temp-buffer
10286       (insert-buffer-substring buf)
10287       (if (and (not read-only)
10288                (not (setq replace-result
10289                           (gnus-request-replace-article
10290                            article (car gnus-article-current)
10291                            (current-buffer) t))))
10292           (error "Couldn't replace article")
10293         ;; If we got a number back, then that's the new article number
10294         ;; for this article.  Otherwise, the article number didn't change.
10295         (when (numberp replace-result)
10296           (with-current-buffer gnus-summary-buffer
10297             (setq gnus-newsgroup-limit (delq article gnus-newsgroup-limit))
10298             (gnus-summary-limit gnus-newsgroup-limit)
10299             (setq article replace-result)
10300             (gnus-summary-goto-subject article t)))
10301         ;; Update the summary buffer.
10302         (if (and references
10303                  (equal (message-tokenize-header references " ")
10304                         (message-tokenize-header
10305                          (or (message-fetch-field "references") "") " ")))
10306             ;; We only have to update this line.
10307             (save-excursion
10308               (save-restriction
10309                 (message-narrow-to-head)
10310                 (let ((head (buffer-substring-no-properties
10311                              (point-min) (point-max)))
10312                       header)
10313                   (with-temp-buffer
10314                     (insert (format "211 %d Article retrieved.\n" article))
10315                     (insert head)
10316                     (insert ".\n")
10317                     (let ((nntp-server-buffer (current-buffer)))
10318                       (setq header (car (gnus-get-newsgroup-headers nil t))))
10319                     (with-current-buffer gnus-summary-buffer
10320                       (gnus-data-set-header (gnus-data-find article) header)
10321                       (gnus-summary-update-article-line article header)
10322                       (if (gnus-summary-goto-subject article nil t)
10323                           (gnus-summary-update-secondary-mark article)))))))
10324           ;; Update threads.
10325           (set-buffer (or buffer gnus-summary-buffer))
10326           (gnus-summary-update-article article)
10327           (if (gnus-summary-goto-subject article nil t)
10328               (gnus-summary-update-secondary-mark article)))
10329         ;; Prettify the article buffer again.
10330         (unless no-highlight
10331           (with-current-buffer gnus-article-buffer
10332             ;;!!! Fix this -- article should be rehighlighted.
10333             ;;(gnus-run-hooks 'gnus-article-display-hook)
10334             (set-buffer gnus-original-article-buffer)
10335             (gnus-request-article
10336              article (car gnus-article-current) (current-buffer))))
10337         ;; Prettify the summary buffer line.
10338         (when (gnus-visual-p 'summary-highlight 'highlight)
10339           (gnus-run-hooks 'gnus-visual-mark-article-hook))))))
10340
10341 (defun gnus-summary-edit-wash (key)
10342   "Perform editing command KEY in the article buffer."
10343   (interactive
10344    (list
10345     (progn
10346       (message "%s" (concat (this-command-keys) "- "))
10347       (read-char))))
10348   (message "")
10349   (gnus-summary-edit-article)
10350   (execute-kbd-macro (concat (this-command-keys) key))
10351   (gnus-article-edit-done))
10352
10353 ;;; Respooling
10354
10355 (defun gnus-summary-respool-query (&optional silent trace)
10356   "Query where the respool algorithm would put this article."
10357   (interactive)
10358   (let (gnus-mark-article-hook)
10359     (gnus-summary-select-article)
10360     (with-current-buffer gnus-original-article-buffer
10361       (let ((groups (nnmail-article-group 'identity trace)))
10362         (unless silent
10363           (if groups
10364               (message "This message would go to %s"
10365                        (mapconcat 'car groups ", "))
10366             (message "This message would go to no groups"))
10367           groups)))))
10368
10369 (defun gnus-summary-respool-trace ()
10370   "Trace where the respool algorithm would put this article.
10371 Display a buffer showing all fancy splitting patterns which matched."
10372   (interactive)
10373   (gnus-summary-respool-query nil t))
10374
10375 ;; Summary marking commands.
10376
10377 (defun gnus-summary-kill-same-subject-and-select (&optional unmark)
10378   "Mark articles which has the same subject as read, and then select the next.
10379 If UNMARK is positive, remove any kind of mark.
10380 If UNMARK is negative, tick articles."
10381   (interactive "P")
10382   (when unmark
10383     (setq unmark (prefix-numeric-value unmark)))
10384   (let ((count
10385          (gnus-summary-mark-same-subject
10386           (gnus-summary-article-subject) unmark)))
10387     ;; Select next unread article.  If auto-select-same mode, should
10388     ;; select the first unread article.
10389     (gnus-summary-next-article t (and gnus-auto-select-same
10390                                       (gnus-summary-article-subject)))
10391     (gnus-message 7 "%d article%s marked as %s"
10392                   count (if (= count 1) " is" "s are")
10393                   (if unmark "unread" "read"))))
10394
10395 (defun gnus-summary-kill-same-subject (&optional unmark)
10396   "Mark articles which has the same subject as read.
10397 If UNMARK is positive, remove any kind of mark.
10398 If UNMARK is negative, tick articles."
10399   (interactive "P")
10400   (when unmark
10401     (setq unmark (prefix-numeric-value unmark)))
10402   (let ((count
10403          (gnus-summary-mark-same-subject
10404           (gnus-summary-article-subject) unmark)))
10405     ;; If marked as read, go to next unread subject.
10406     (when (null unmark)
10407       ;; Go to next unread subject.
10408       (gnus-summary-next-subject 1 t))
10409     (gnus-message 7 "%d articles are marked as %s"
10410                   count (if unmark "unread" "read"))))
10411
10412 (defun gnus-summary-mark-same-subject (subject &optional unmark)
10413   "Mark articles with same SUBJECT as read, and return marked number.
10414 If optional argument UNMARK is positive, remove any kinds of marks.
10415 If optional argument UNMARK is negative, mark articles as unread instead."
10416   (let ((count 1))
10417     (save-excursion
10418       (cond
10419        ((null unmark)                   ; Mark as read.
10420         (while (and
10421                 (progn
10422                   (gnus-summary-mark-article-as-read gnus-killed-mark)
10423                   (gnus-summary-show-thread) t)
10424                 (gnus-summary-find-subject subject))
10425           (setq count (1+ count))))
10426        ((> unmark 0)                    ; Tick.
10427         (while (and
10428                 (progn
10429                   (gnus-summary-mark-article-as-unread gnus-ticked-mark)
10430                   (gnus-summary-show-thread) t)
10431                 (gnus-summary-find-subject subject))
10432           (setq count (1+ count))))
10433        (t                               ; Mark as unread.
10434         (while (and
10435                 (progn
10436                   (gnus-summary-mark-article-as-unread gnus-unread-mark)
10437                   (gnus-summary-show-thread) t)
10438                 (gnus-summary-find-subject subject))
10439           (setq count (1+ count)))))
10440       (gnus-set-mode-line 'summary)
10441       ;; Return the number of marked articles.
10442       count)))
10443
10444 (defun gnus-summary-mark-as-processable (n &optional unmark)
10445   "Set the process mark on the next N articles.
10446 If N is negative, mark backward instead.  If UNMARK is non-nil, remove
10447 the process mark instead.  The difference between N and the actual
10448 number of articles marked is returned."
10449   (interactive "P")
10450   (if (and (null n) (gnus-region-active-p))
10451       (gnus-uu-mark-region (region-beginning) (region-end) unmark)
10452     (setq n (prefix-numeric-value n))
10453     (let ((backward (< n 0))
10454           (n (abs n)))
10455       (while (and
10456               (> n 0)
10457               (if unmark
10458                   (gnus-summary-remove-process-mark
10459                    (gnus-summary-article-number))
10460                 (gnus-summary-set-process-mark (gnus-summary-article-number)))
10461               (zerop (gnus-summary-next-subject (if backward -1 1) nil t)))
10462         (setq n (1- n)))
10463       (when (/= 0 n)
10464         (gnus-message 7 "No more articles"))
10465       (gnus-summary-recenter)
10466       (gnus-summary-position-point)
10467       n)))
10468
10469 (defun gnus-summary-unmark-as-processable (n)
10470   "Remove the process mark from the next N articles.
10471 If N is negative, unmark backward instead.  The difference between N and
10472 the actual number of articles unmarked is returned."
10473   (interactive "P")
10474   (gnus-summary-mark-as-processable n t))
10475
10476 (defun gnus-summary-unmark-all-processable ()
10477   "Remove the process mark from all articles."
10478   (interactive)
10479   (save-excursion
10480     (while gnus-newsgroup-processable
10481       (gnus-summary-remove-process-mark (car gnus-newsgroup-processable))))
10482   (gnus-summary-position-point))
10483
10484 (defun gnus-summary-add-mark (article type)
10485   "Mark ARTICLE with a mark of TYPE."
10486   (let ((vtype (car (assq type gnus-article-mark-lists)))
10487         var)
10488     (if (not vtype)
10489         (error "No such mark type: %s" type)
10490       (setq var (intern (format "gnus-newsgroup-%s" type)))
10491       (set var (cons article (symbol-value var)))
10492       (if (memq type '(processable cached replied forwarded recent saved))
10493           (gnus-summary-update-secondary-mark article)
10494         ;;; !!! This is bogus.  We should find out what primary
10495         ;;; !!! mark we want to set.
10496         (gnus-summary-update-mark gnus-del-mark 'unread)))))
10497
10498 (defun gnus-summary-mark-as-expirable (n)
10499   "Mark N articles forward as expirable.
10500 If N is negative, mark backward instead.  The difference between N and
10501 the actual number of articles marked is returned."
10502   (interactive "p")
10503   (gnus-summary-mark-forward n gnus-expirable-mark))
10504
10505 (defun gnus-summary-mark-as-spam (n)
10506   "Mark N articles forward as spam.
10507 If N is negative, mark backward instead.  The difference between N and
10508 the actual number of articles marked is returned."
10509   (interactive "p")
10510   (gnus-summary-mark-forward n gnus-spam-mark))
10511
10512 (defun gnus-summary-mark-article-as-replied (article)
10513   "Mark ARTICLE as replied to and update the summary line.
10514 ARTICLE can also be a list of articles."
10515   (interactive (list (gnus-summary-article-number)))
10516   (let ((articles (if (listp article) article (list article))))
10517     (dolist (article articles)
10518       (unless (numberp article)
10519         (error "%s is not a number" article))
10520       (push article gnus-newsgroup-replied)
10521       (let ((inhibit-read-only t))
10522         (when (gnus-summary-goto-subject article nil t)
10523           (gnus-summary-update-secondary-mark article))))))
10524
10525 (defun gnus-summary-mark-article-as-forwarded (article)
10526   "Mark ARTICLE as forwarded and update the summary line.
10527 ARTICLE can also be a list of articles."
10528   (let ((articles (if (listp article) article (list article))))
10529     (dolist (article articles)
10530       (push article gnus-newsgroup-forwarded)
10531       (let ((inhibit-read-only t))
10532         (when (gnus-summary-goto-subject article nil t)
10533           (gnus-summary-update-secondary-mark article))))))
10534
10535 (defun gnus-summary-set-bookmark (article)
10536   "Set a bookmark in current article."
10537   (interactive (list (gnus-summary-article-number)))
10538   (when (or (not (get-buffer gnus-article-buffer))
10539             (not gnus-current-article)
10540             (not gnus-article-current)
10541             (not (equal gnus-newsgroup-name (car gnus-article-current))))
10542     (error "No current article selected"))
10543   ;; Remove old bookmark, if one exists.
10544   (gnus-alist-pull article gnus-newsgroup-bookmarks)
10545   ;; Set the new bookmark, which is on the form
10546   ;; (article-number . line-number-in-body).
10547   (push
10548    (cons article
10549          (with-current-buffer gnus-article-buffer
10550            (count-lines
10551             (min (point)
10552                  (save-excursion
10553                    (article-goto-body)
10554                    (point)))
10555             (point))))
10556    gnus-newsgroup-bookmarks)
10557   (gnus-message 6 "A bookmark has been added to the current article."))
10558
10559 (defun gnus-summary-remove-bookmark (article)
10560   "Remove the bookmark from the current article."
10561   (interactive (list (gnus-summary-article-number)))
10562   ;; Remove old bookmark, if one exists.
10563   (if (not (assq article gnus-newsgroup-bookmarks))
10564       (gnus-message 6 "No bookmark in current article.")
10565     (gnus-alist-pull article gnus-newsgroup-bookmarks)
10566     (gnus-message 6 "Removed bookmark.")))
10567
10568 ;; Suggested by Daniel Quinlan <quinlan@best.com>.
10569 (defun gnus-summary-mark-as-dormant (n)
10570   "Mark N articles forward as dormant.
10571 If N is negative, mark backward instead.  The difference between N and
10572 the actual number of articles marked is returned."
10573   (interactive "p")
10574   (gnus-summary-mark-forward n gnus-dormant-mark))
10575
10576 (defun gnus-summary-set-process-mark (article)
10577   "Set the process mark on ARTICLE and update the summary line."
10578   (setq gnus-newsgroup-processable
10579         (cons article
10580               (delq article gnus-newsgroup-processable)))
10581   (when (gnus-summary-goto-subject article)
10582     (gnus-summary-show-thread)
10583     (gnus-summary-goto-subject article)
10584     (gnus-summary-update-secondary-mark article)))
10585
10586 (defun gnus-summary-remove-process-mark (&rest articles)
10587   "Remove the process mark from ARTICLES and update the summary line."
10588   (dolist (article articles)
10589     (setq gnus-newsgroup-processable (delq article gnus-newsgroup-processable))
10590     (when (gnus-summary-goto-subject article)
10591       (gnus-summary-show-thread)
10592       (gnus-summary-goto-subject article)
10593       (gnus-summary-update-secondary-mark article)))
10594   t)
10595
10596 (defun gnus-summary-set-saved-mark (article)
10597   "Set the process mark on ARTICLE and update the summary line."
10598   (push article gnus-newsgroup-saved)
10599   (when (gnus-summary-goto-subject article)
10600     (gnus-summary-update-secondary-mark article)))
10601
10602 (defun gnus-summary-mark-forward (n &optional mark no-expire)
10603   "Mark N articles as read forwards.
10604 If N is negative, mark backwards instead.  Mark with MARK, ?r by default.
10605 The difference between N and the actual number of articles marked is
10606 returned.
10607 If NO-EXPIRE, auto-expiry will be inhibited."
10608   (interactive "p")
10609   (gnus-summary-show-thread)
10610   (let ((backward (< n 0))
10611         (gnus-summary-goto-unread
10612          (and gnus-summary-goto-unread
10613               (not (eq gnus-summary-goto-unread 'never))
10614               (not (memq mark (list gnus-unread-mark gnus-spam-mark
10615                                     gnus-ticked-mark gnus-dormant-mark)))))
10616         (n (abs n))
10617         (mark (or mark gnus-del-mark)))
10618     (while (and (> n 0)
10619                 (gnus-summary-mark-article nil mark no-expire)
10620                 (zerop (gnus-summary-next-subject
10621                         (if backward -1 1)
10622                         (and gnus-summary-goto-unread
10623                              (not (eq gnus-summary-goto-unread 'never)))
10624                         t)))
10625       (setq n (1- n)))
10626     (when (/= 0 n)
10627       (gnus-message 7 "No more %sarticles" (if mark "" "unread ")))
10628     (gnus-summary-recenter)
10629     (gnus-summary-position-point)
10630     (gnus-set-mode-line 'summary)
10631     n))
10632
10633 (defun gnus-summary-mark-article-as-read (mark)
10634   "Mark the current article quickly as read with MARK."
10635   (let ((article (gnus-summary-article-number)))
10636     (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
10637     (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
10638     (setq gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked))
10639     (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
10640     (push (cons article mark) gnus-newsgroup-reads)
10641     ;; Possibly remove from cache, if that is used.
10642     (when gnus-use-cache
10643       (gnus-cache-enter-remove-article article))
10644     ;; Allow the backend to change the mark.
10645     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
10646     ;; Check for auto-expiry.
10647     (when (and gnus-newsgroup-auto-expire
10648                (memq mark gnus-auto-expirable-marks))
10649       (setq mark gnus-expirable-mark)
10650       ;; Let the backend know about the mark change.
10651       (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
10652       (push article gnus-newsgroup-expirable))
10653     ;; Set the mark in the buffer.
10654     (gnus-summary-update-mark mark 'unread)
10655     t))
10656
10657 (defun gnus-summary-mark-article-as-unread (mark)
10658   "Mark the current article quickly as unread with MARK."
10659   (let* ((article (gnus-summary-article-number))
10660          (old-mark (gnus-summary-article-mark article)))
10661     ;; Allow the backend to change the mark.
10662     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
10663     (if (eq mark old-mark)
10664         t
10665       (if (<= article 0)
10666           (progn
10667             (gnus-error 1 "Can't mark negative article numbers")
10668             nil)
10669         (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
10670         (setq gnus-newsgroup-spam-marked
10671               (delq article gnus-newsgroup-spam-marked))
10672         (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
10673         (setq gnus-newsgroup-expirable (delq article gnus-newsgroup-expirable))
10674         (setq gnus-newsgroup-reads (delq article gnus-newsgroup-reads))
10675         (cond ((= mark gnus-ticked-mark)
10676                (setq gnus-newsgroup-marked
10677                      (gnus-add-to-sorted-list gnus-newsgroup-marked
10678                                               article)))
10679               ((= mark gnus-spam-mark)
10680                (setq gnus-newsgroup-spam-marked
10681                      (gnus-add-to-sorted-list gnus-newsgroup-spam-marked
10682                                               article)))
10683               ((= mark gnus-dormant-mark)
10684                (setq gnus-newsgroup-dormant
10685                      (gnus-add-to-sorted-list gnus-newsgroup-dormant
10686                                               article)))
10687               (t
10688                (setq gnus-newsgroup-unreads
10689                      (gnus-add-to-sorted-list gnus-newsgroup-unreads
10690                                               article))))
10691         (gnus-alist-pull article gnus-newsgroup-reads)
10692
10693         ;; See whether the article is to be put in the cache.
10694         (and gnus-use-cache
10695              (vectorp (gnus-summary-article-header article))
10696              (save-excursion
10697                (gnus-cache-possibly-enter-article
10698                 gnus-newsgroup-name article
10699                 (= mark gnus-ticked-mark)
10700                 (= mark gnus-dormant-mark) (= mark gnus-unread-mark))))
10701
10702         ;; Fix the mark.
10703         (gnus-summary-update-mark mark 'unread)
10704         t))))
10705
10706 (defun gnus-summary-mark-article (&optional article mark no-expire)
10707   "Mark ARTICLE with MARK.  MARK can be any character.
10708 Four MARK strings are reserved: `? ' (unread), `?!' (ticked),
10709 `??' (dormant) and `?E' (expirable).
10710 If MARK is nil, then the default character `?r' is used.
10711 If ARTICLE is nil, then the article on the current line will be
10712 marked.
10713 If NO-EXPIRE, auto-expiry will be inhibited."
10714   ;; The mark might be a string.
10715   (when (stringp mark)
10716     (setq mark (aref mark 0)))
10717   ;; If no mark is given, then we check auto-expiring.
10718   (when (null mark)
10719     (setq mark gnus-del-mark))
10720   (when (and (not no-expire)
10721              gnus-newsgroup-auto-expire
10722              (memq mark gnus-auto-expirable-marks))
10723     (setq mark gnus-expirable-mark))
10724   (let ((article (or article (gnus-summary-article-number)))
10725         (old-mark (gnus-summary-article-mark article)))
10726     ;; Allow the backend to change the mark.
10727     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
10728     (if (eq mark old-mark)
10729         t
10730       (unless article
10731         (error "No article on current line"))
10732       (if (not (if (or (= mark gnus-unread-mark)
10733                        (= mark gnus-ticked-mark)
10734                        (= mark gnus-spam-mark)
10735                        (= mark gnus-dormant-mark))
10736                    (gnus-mark-article-as-unread article mark)
10737                  (gnus-mark-article-as-read article mark)))
10738           t
10739         ;; See whether the article is to be put in the cache.
10740         (and gnus-use-cache
10741              (not (= mark gnus-canceled-mark))
10742              (vectorp (gnus-summary-article-header article))
10743              (save-excursion
10744                (gnus-cache-possibly-enter-article
10745                 gnus-newsgroup-name article
10746                 (= mark gnus-ticked-mark)
10747                 (= mark gnus-dormant-mark) (= mark gnus-unread-mark))))
10748
10749         (when (gnus-summary-goto-subject article nil t)
10750           (let ((inhibit-read-only t))
10751             (gnus-summary-show-thread)
10752             ;; Fix the mark.
10753             (gnus-summary-update-mark mark 'unread)
10754             t))))))
10755
10756 (defun gnus-summary-update-secondary-mark (article)
10757   "Update the secondary (read, process, cache) mark."
10758   (gnus-summary-update-mark
10759    (cond ((memq article gnus-newsgroup-processable)
10760           gnus-process-mark)
10761          ((memq article gnus-newsgroup-cached)
10762           gnus-cached-mark)
10763          ((memq article gnus-newsgroup-replied)
10764           gnus-replied-mark)
10765          ((memq article gnus-newsgroup-forwarded)
10766           gnus-forwarded-mark)
10767          ((memq article gnus-newsgroup-saved)
10768           gnus-saved-mark)
10769          ((memq article gnus-newsgroup-recent)
10770           gnus-recent-mark)
10771          ((memq article gnus-newsgroup-unseen)
10772           gnus-unseen-mark)
10773          (t gnus-no-mark))
10774    'replied)
10775   (when (gnus-visual-p 'summary-highlight 'highlight)
10776     (gnus-summary-highlight-line)
10777     (gnus-run-hooks 'gnus-summary-update-hook))
10778   t)
10779
10780 (defun gnus-summary-update-download-mark (article)
10781   "Update the download mark."
10782   (gnus-summary-update-mark
10783    (cond ((memq article gnus-newsgroup-undownloaded)
10784           gnus-undownloaded-mark)
10785          (gnus-newsgroup-agentized
10786           gnus-downloaded-mark)
10787          (t
10788           gnus-no-mark))
10789    'download)
10790   (gnus-summary-update-line t)
10791   t)
10792
10793 (defun gnus-summary-update-mark (mark type)
10794   (let ((forward (cdr (assq type gnus-summary-mark-positions)))
10795         (inhibit-read-only t))
10796     (re-search-backward "[\n\r]" (point-at-bol) 'move-to-limit)
10797     (when forward
10798       (when (looking-at "\r")
10799         (incf forward))
10800       (when (<= (+ forward (point)) (point-max))
10801         ;; Go to the right position on the line.
10802         (goto-char (+ forward (point)))
10803         ;; Replace the old mark with the new mark.
10804         (let ((to-insert
10805                (mm-subst-char-in-string
10806                 (char-after) mark
10807                 (buffer-substring (point) (1+ (point))))))
10808           (delete-region (point) (1+ (point)))
10809           (insert to-insert))
10810         ;; Optionally update the marks by some user rule.
10811         (when (eq type 'unread)
10812           (gnus-data-set-mark
10813            (gnus-data-find (gnus-summary-article-number)) mark)
10814           (gnus-summary-update-line (eq mark gnus-unread-mark)))))))
10815
10816 (defun gnus-mark-article-as-read (article &optional mark)
10817   "Enter ARTICLE in the pertinent lists and remove it from others."
10818   ;; Make the article expirable.
10819   (let ((mark (or mark gnus-del-mark)))
10820     (setq gnus-newsgroup-expirable
10821           (if (= mark gnus-expirable-mark)
10822               (gnus-add-to-sorted-list gnus-newsgroup-expirable article)
10823             (delq article gnus-newsgroup-expirable)))
10824     ;; Remove from unread and marked lists.
10825     (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
10826     (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
10827     (setq gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked))
10828     (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
10829     (push (cons article mark) gnus-newsgroup-reads)
10830     ;; Possibly remove from cache, if that is used.
10831     (when gnus-use-cache
10832       (gnus-cache-enter-remove-article article))
10833     t))
10834
10835 (defun gnus-mark-article-as-unread (article &optional mark)
10836   "Enter ARTICLE in the pertinent lists and remove it from others."
10837   (let ((mark (or mark gnus-ticked-mark)))
10838     (if (<= article 0)
10839         (progn
10840           (gnus-error 1 "Can't mark negative article numbers")
10841           nil)
10842       (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked)
10843             gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked)
10844             gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant)
10845             gnus-newsgroup-expirable (delq article gnus-newsgroup-expirable)
10846             gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
10847
10848       ;; Unsuppress duplicates?
10849       (when gnus-suppress-duplicates
10850         (gnus-dup-unsuppress-article article))
10851
10852       (cond ((= mark gnus-ticked-mark)
10853              (setq gnus-newsgroup-marked
10854                    (gnus-add-to-sorted-list gnus-newsgroup-marked article)))
10855             ((= mark gnus-spam-mark)
10856              (setq gnus-newsgroup-spam-marked
10857                    (gnus-add-to-sorted-list gnus-newsgroup-spam-marked
10858                                             article)))
10859             ((= mark gnus-dormant-mark)
10860              (setq gnus-newsgroup-dormant
10861                    (gnus-add-to-sorted-list gnus-newsgroup-dormant article)))
10862             (t
10863              (setq gnus-newsgroup-unreads
10864                    (gnus-add-to-sorted-list gnus-newsgroup-unreads article))))
10865       (gnus-alist-pull article gnus-newsgroup-reads)
10866       t)))
10867
10868 (defun gnus-summary-tick-article-forward (n)
10869   "Tick N articles forwards.
10870 If N is negative, tick backwards instead.
10871 The difference between N and the number of articles ticked is returned."
10872   (interactive "p")
10873   (gnus-summary-mark-forward n gnus-ticked-mark))
10874
10875 (defun gnus-summary-tick-article-backward (n)
10876   "Tick N articles backwards.
10877 The difference between N and the number of articles ticked is returned."
10878   (interactive "p")
10879   (gnus-summary-mark-forward (- n) gnus-ticked-mark))
10880
10881 (defun gnus-summary-tick-article (&optional article clear-mark)
10882   "Mark current article as unread.
10883 Optional 1st argument ARTICLE specifies article number to be marked as unread.
10884 Optional 2nd argument CLEAR-MARK remove any kinds of mark."
10885   (interactive)
10886   (gnus-summary-mark-article article (if clear-mark gnus-unread-mark
10887                                        gnus-ticked-mark)))
10888
10889 (defun gnus-summary-mark-as-read-forward (n)
10890   "Mark N articles as read forwards.
10891 If N is negative, mark backwards instead.
10892 The difference between N and the actual number of articles marked is
10893 returned."
10894   (interactive "p")
10895   (gnus-summary-mark-forward n gnus-del-mark gnus-inhibit-user-auto-expire))
10896
10897 (defun gnus-summary-mark-as-read-backward (n)
10898   "Mark the N articles as read backwards.
10899 The difference between N and the actual number of articles marked is
10900 returned."
10901   (interactive "p")
10902   (gnus-summary-mark-forward
10903    (- n) gnus-del-mark gnus-inhibit-user-auto-expire))
10904
10905 (defun gnus-summary-mark-as-read (&optional article mark)
10906   "Mark current article as read.
10907 ARTICLE specifies the article to be marked as read.
10908 MARK specifies a string to be inserted at the beginning of the line."
10909   (gnus-summary-mark-article article mark))
10910
10911 (defun gnus-summary-clear-mark-forward (n)
10912   "Clear marks from N articles forward.
10913 If N is negative, clear backward instead.
10914 The difference between N and the number of marks cleared is returned."
10915   (interactive "p")
10916   (gnus-summary-mark-forward n gnus-unread-mark))
10917
10918 (defun gnus-summary-clear-mark-backward (n)
10919   "Clear marks from N articles backward.
10920 The difference between N and the number of marks cleared is returned."
10921   (interactive "p")
10922   (gnus-summary-mark-forward (- n) gnus-unread-mark))
10923
10924 (defun gnus-summary-mark-unread-as-read ()
10925   "Intended to be used by `gnus-mark-article-hook'."
10926   (when (memq gnus-current-article gnus-newsgroup-unreads)
10927     (gnus-summary-mark-article gnus-current-article gnus-read-mark)))
10928
10929 (defun gnus-summary-mark-read-and-unread-as-read (&optional new-mark)
10930   "Intended to be used by `gnus-mark-article-hook'."
10931   (let ((mark (gnus-summary-article-mark)))
10932     (when (or (gnus-unread-mark-p mark)
10933               (gnus-read-mark-p mark))
10934       (gnus-summary-mark-article gnus-current-article
10935                                  (or new-mark gnus-read-mark)))))
10936
10937 (defun gnus-summary-mark-current-read-and-unread-as-read (&optional new-mark)
10938   "Intended to be used by `gnus-mark-article-hook'."
10939   (let ((mark (gnus-summary-article-mark)))
10940     (when (or (gnus-unread-mark-p mark)
10941               (gnus-read-mark-p mark))
10942       (gnus-summary-mark-article (gnus-summary-article-number)
10943                                  (or new-mark gnus-read-mark)))))
10944
10945 (defun gnus-summary-mark-unread-as-ticked ()
10946   "Intended to be used by `gnus-mark-article-hook'."
10947   (when (memq gnus-current-article gnus-newsgroup-unreads)
10948     (gnus-summary-mark-article gnus-current-article gnus-ticked-mark)))
10949
10950 (defun gnus-summary-mark-region-as-read (point mark all)
10951   "Mark all unread articles between point and mark as read.
10952 If given a prefix, mark all articles between point and mark as read,
10953 even ticked and dormant ones."
10954   (interactive "r\nP")
10955   (save-excursion
10956     (let (article)
10957       (goto-char point)
10958       (beginning-of-line)
10959       (while (and
10960               (< (point) mark)
10961               (progn
10962                 (when (or all
10963                           (memq (setq article (gnus-summary-article-number))
10964                                 gnus-newsgroup-unreads))
10965                   (gnus-summary-mark-article article gnus-del-mark))
10966                 t)
10967               (gnus-summary-find-next))))))
10968
10969 (defun gnus-summary-mark-below (score mark)
10970   "Mark articles with score less than SCORE with MARK."
10971   (interactive "P\ncMark: ")
10972   (setq score (if score
10973                   (prefix-numeric-value score)
10974                 (or gnus-summary-default-score 0)))
10975   (with-current-buffer gnus-summary-buffer
10976     (goto-char (point-min))
10977     (while
10978         (progn
10979           (and (< (gnus-summary-article-score) score)
10980                (gnus-summary-mark-article nil mark))
10981           (gnus-summary-find-next)))))
10982
10983 (defun gnus-summary-kill-below (&optional score)
10984   "Mark articles with score below SCORE as read."
10985   (interactive "P")
10986   (gnus-summary-mark-below score gnus-killed-mark))
10987
10988 (defun gnus-summary-clear-above (&optional score)
10989   "Clear all marks from articles with score above SCORE."
10990   (interactive "P")
10991   (gnus-summary-mark-above score gnus-unread-mark))
10992
10993 (defun gnus-summary-tick-above (&optional score)
10994   "Tick all articles with score above SCORE."
10995   (interactive "P")
10996   (gnus-summary-mark-above score gnus-ticked-mark))
10997
10998 (defun gnus-summary-mark-above (score mark)
10999   "Mark articles with score over SCORE with MARK."
11000   (interactive "P\ncMark: ")
11001   (setq score (if score
11002                   (prefix-numeric-value score)
11003                 (or gnus-summary-default-score 0)))
11004   (with-current-buffer gnus-summary-buffer
11005     (goto-char (point-min))
11006     (while (and (progn
11007                   (when (> (gnus-summary-article-score) score)
11008                     (gnus-summary-mark-article nil mark))
11009                   t)
11010                 (gnus-summary-find-next)))))
11011
11012 ;; Suggested by Daniel Quinlan <quinlan@best.com>.
11013 (defalias 'gnus-summary-show-all-expunged 'gnus-summary-limit-include-expunged)
11014 (defun gnus-summary-limit-include-expunged (&optional no-error)
11015   "Display all the hidden articles that were expunged for low scores."
11016   (interactive)
11017   (let ((inhibit-read-only t))
11018     (let ((scored gnus-newsgroup-scored)
11019           headers h)
11020       (while scored
11021         (unless (gnus-summary-article-header (caar scored))
11022           (and (setq h (gnus-number-to-header (caar scored)))
11023                (< (cdar scored) gnus-summary-expunge-below)
11024                (push h headers)))
11025         (setq scored (cdr scored)))
11026       (if (not headers)
11027           (when (not no-error)
11028             (error "No expunged articles hidden"))
11029         (goto-char (point-min))
11030         (push gnus-newsgroup-limit gnus-newsgroup-limits)
11031         (setq gnus-newsgroup-limit (copy-sequence gnus-newsgroup-limit))
11032         (dolist (x headers)
11033           (push (mail-header-number x) gnus-newsgroup-limit))
11034         (gnus-summary-prepare-unthreaded (nreverse headers))
11035         (goto-char (point-min))
11036         (gnus-summary-position-point)
11037         t))))
11038
11039 (defun gnus-summary-catchup (&optional all quietly to-here not-mark reverse)
11040   "Mark all unread articles in this newsgroup as read.
11041 If prefix argument ALL is non-nil, ticked and dormant articles will
11042 also be marked as read.
11043 If QUIETLY is non-nil, no questions will be asked.
11044
11045 If TO-HERE is non-nil, it should be a point in the buffer.  All
11046 articles before (after, if REVERSE is set) this point will be marked
11047 as read.
11048
11049 Note that this function will only catch up the unread article
11050 in the current summary buffer limitation.
11051
11052 The number of articles marked as read is returned."
11053   (interactive "P")
11054   (prog1
11055       (save-excursion
11056         (when (or quietly
11057                   (not gnus-interactive-catchup) ;Without confirmation?
11058                   gnus-expert-user
11059                   (gnus-y-or-n-p
11060                    (if all
11061                        "Mark absolutely all articles as read? "
11062                      "Mark all unread articles as read? ")))
11063           (if (and not-mark
11064                    (not gnus-newsgroup-adaptive)
11065                    (not gnus-newsgroup-auto-expire)
11066                    (not gnus-suppress-duplicates)
11067                    (or (not gnus-use-cache)
11068                        (eq gnus-use-cache 'passive)))
11069               (progn
11070                 (when all
11071                   (setq gnus-newsgroup-marked nil
11072                         gnus-newsgroup-spam-marked nil
11073                         gnus-newsgroup-dormant nil))
11074                 (setq gnus-newsgroup-unreads
11075                       (gnus-sorted-nunion
11076                        (gnus-sorted-intersection gnus-newsgroup-unreads
11077                                                  gnus-newsgroup-downloadable)
11078                        (gnus-sorted-difference gnus-newsgroup-unfetched
11079                                                gnus-newsgroup-cached))))
11080             ;; We actually mark all articles as canceled, which we
11081             ;; have to do when using auto-expiry or adaptive scoring.
11082             (gnus-summary-show-all-threads)
11083             (if (and to-here reverse)
11084                 (progn
11085                   (goto-char to-here)
11086                   (gnus-summary-mark-current-read-and-unread-as-read
11087                    gnus-catchup-mark)
11088                   (while (gnus-summary-find-next (not all))
11089                     (gnus-summary-mark-article-as-read gnus-catchup-mark)))
11090               (when (gnus-summary-first-subject (not all))
11091                 (while (and
11092                         (if to-here (< (point) to-here) t)
11093                         (gnus-summary-mark-article-as-read gnus-catchup-mark)
11094                         (gnus-summary-find-next (not all))))))
11095             (gnus-set-mode-line 'summary))
11096           t))
11097     (gnus-summary-position-point)))
11098
11099 (defun gnus-summary-catchup-to-here (&optional all)
11100   "Mark all unticked articles before the current one as read.
11101 If ALL is non-nil, also mark ticked and dormant articles as read."
11102   (interactive "P")
11103   (save-excursion
11104     (gnus-save-hidden-threads
11105       (let ((beg (point)))
11106         ;; We check that there are unread articles.
11107         (when (or all (gnus-summary-find-prev))
11108           (gnus-summary-catchup all t beg)))))
11109   (gnus-summary-position-point))
11110
11111 (defun gnus-summary-catchup-from-here (&optional all)
11112   "Mark all unticked articles after (and including) the current one as read.
11113 If ALL is non-nil, also mark ticked and dormant articles as read."
11114   (interactive "P")
11115   (save-excursion
11116     (gnus-save-hidden-threads
11117       (let ((beg (point)))
11118         ;; We check that there are unread articles.
11119         (when (or all (gnus-summary-find-next))
11120           (gnus-summary-catchup all t beg nil t)))))
11121   (gnus-summary-position-point))
11122
11123 (defun gnus-summary-catchup-all (&optional quietly)
11124   "Mark all articles in this newsgroup as read.
11125 This command is dangerous.  Normally, you want \\[gnus-summary-catchup]
11126 instead, which marks only unread articles as read."
11127   (interactive "P")
11128   (gnus-summary-catchup t quietly))
11129
11130 (defun gnus-summary-catchup-and-exit (&optional all quietly)
11131   "Mark all unread articles in this group as read, then exit.
11132 If prefix argument ALL is non-nil, all articles are marked as read.
11133 If QUIETLY is non-nil, no questions will be asked."
11134   (interactive "P")
11135   (when (gnus-summary-catchup all quietly nil 'fast)
11136     ;; Select next newsgroup or exit.
11137     (if (and (not (gnus-group-quit-config gnus-newsgroup-name))
11138              (eq gnus-auto-select-next 'quietly))
11139         (gnus-summary-next-group nil)
11140       (gnus-summary-exit))))
11141
11142 (defun gnus-summary-catchup-all-and-exit (&optional quietly)
11143   "Mark all articles in this newsgroup as read, and then exit.
11144 This command is dangerous.  Normally, you want \\[gnus-summary-catchup-and-exit]
11145 instead, which marks only unread articles as read."
11146   (interactive "P")
11147   (gnus-summary-catchup-and-exit t quietly))
11148
11149 (defun gnus-summary-catchup-and-goto-next-group (&optional all)
11150   "Mark all articles in this group as read and select the next group.
11151 If given a prefix, mark all articles, unread as well as ticked, as
11152 read."
11153   (interactive "P")
11154   (save-excursion
11155     (gnus-summary-catchup all))
11156   (gnus-summary-next-group))
11157
11158 (defun gnus-summary-catchup-and-goto-prev-group (&optional all)
11159   "Mark all articles in this group as read and select the previous group.
11160 If given a prefix, mark all articles, unread as well as ticked, as
11161 read."
11162   (interactive "P")
11163   (save-excursion
11164     (gnus-summary-catchup all))
11165   (gnus-summary-next-group nil nil t))
11166
11167 ;;;
11168 ;;; with article
11169 ;;;
11170
11171 (defmacro gnus-with-article (article &rest forms)
11172   "Select ARTICLE and perform FORMS in the original article buffer.
11173 Then replace the article with the result."
11174   `(progn
11175      ;; We don't want the article to be marked as read.
11176      (let (gnus-mark-article-hook)
11177        (gnus-summary-select-article t t nil ,article))
11178      (set-buffer gnus-original-article-buffer)
11179      ,@forms
11180      (if (not (gnus-check-backend-function
11181                'request-replace-article (car gnus-article-current)))
11182          (gnus-message 5 "Read-only group; not replacing")
11183        (unless (gnus-request-replace-article
11184                 ,article (car gnus-article-current)
11185                 (current-buffer) t)
11186          (error "Couldn't replace article")))
11187      ;; The cache and backlog have to be flushed somewhat.
11188      (when gnus-keep-backlog
11189        (gnus-backlog-remove-article
11190         (car gnus-article-current) (cdr gnus-article-current)))
11191      (when gnus-use-cache
11192        (gnus-cache-update-article
11193         (car gnus-article-current) (cdr gnus-article-current)))))
11194
11195 (put 'gnus-with-article 'lisp-indent-function 1)
11196 (put 'gnus-with-article 'edebug-form-spec '(form body))
11197
11198 ;; Thread-based commands.
11199
11200 (defun gnus-summary-articles-in-thread (&optional article)
11201   "Return a list of all articles in the current thread.
11202 If ARTICLE is non-nil, return all articles in the thread that starts
11203 with that article."
11204   (let* ((article (or article (gnus-summary-article-number)))
11205          (data (gnus-data-find-list article))
11206          (top-level (gnus-data-level (car data)))
11207          (top-subject
11208           (cond ((null gnus-thread-operation-ignore-subject)
11209                  (gnus-simplify-subject-re
11210                   (mail-header-subject (gnus-data-header (car data)))))
11211                 ((eq gnus-thread-operation-ignore-subject 'fuzzy)
11212                  (gnus-simplify-subject-fuzzy
11213                   (mail-header-subject (gnus-data-header (car data)))))
11214                 (t nil)))
11215          (end-point (save-excursion
11216                       (if (gnus-summary-go-to-next-thread)
11217                           (point) (point-max))))
11218          articles)
11219     (while (and data
11220                 (< (gnus-data-pos (car data)) end-point))
11221       (when (or (not top-subject)
11222                 (string= top-subject
11223                          (if (eq gnus-thread-operation-ignore-subject 'fuzzy)
11224                              (gnus-simplify-subject-fuzzy
11225                               (mail-header-subject
11226                                (gnus-data-header (car data))))
11227                            (gnus-simplify-subject-re
11228                             (mail-header-subject
11229                              (gnus-data-header (car data)))))))
11230         (push (gnus-data-number (car data)) articles))
11231       (unless (and (setq data (cdr data))
11232                    (> (gnus-data-level (car data)) top-level))
11233         (setq data nil)))
11234     ;; Return the list of articles.
11235     (nreverse articles)))
11236
11237 (defun gnus-summary-rethread-current ()
11238   "Rethread the thread the current article is part of."
11239   (interactive)
11240   (let* ((gnus-show-threads t)
11241          (article (gnus-summary-article-number))
11242          (id (mail-header-id (gnus-summary-article-header)))
11243          (gnus-newsgroup-threads (list (gnus-id-to-thread (gnus-root-id id)))))
11244     (unless id
11245       (error "No article on the current line"))
11246     (gnus-rebuild-thread id)
11247     (gnus-summary-goto-subject article)))
11248
11249 (defun gnus-summary-reparent-thread ()
11250   "Make the current article child of the marked (or previous) article.
11251
11252 Note that the re-threading will only work if `gnus-thread-ignore-subject'
11253 is non-nil or the Subject: of both articles are the same."
11254   (interactive)
11255   (unless (not (gnus-group-read-only-p))
11256     (error "The current newsgroup does not support article editing"))
11257   (unless (<= (length gnus-newsgroup-processable) 1)
11258     (error "No more than one article may be marked"))
11259   (let ((child (gnus-summary-article-number))
11260         ;; First grab the marked article, otherwise one line up.
11261         (parent (if (not (null gnus-newsgroup-processable))
11262                     (car gnus-newsgroup-processable)
11263                   (save-excursion
11264                     (if (eq (forward-line -1) 0)
11265                         (gnus-summary-article-number)
11266                       (error "Beginning of summary buffer"))))))
11267     (gnus-summary-reparent-children parent (list child))))
11268
11269 (defun gnus-summary-reparent-children (parent children)
11270   "Make PARENT the parent of CHILDREN.
11271 When called interactively, PARENT is the current article and CHILDREN
11272 are the process-marked articles."
11273   (interactive
11274    (list (gnus-summary-article-number)
11275          (gnus-summary-work-articles nil)))
11276   (dolist (child children)
11277     (save-window-excursion
11278       (let ((gnus-article-buffer " *reparent*"))
11279         (unless (not (eq parent child))
11280           (error "An article may not be self-referential"))
11281         (let ((message-id (mail-header-id
11282                            (gnus-summary-article-header parent))))
11283           (unless (and message-id (not (equal message-id "")))
11284             (error "No message-id in desired parent"))
11285           (gnus-with-article child
11286             (save-restriction
11287               (goto-char (point-min))
11288               (message-narrow-to-head)
11289               (if (re-search-forward "^References: " nil t)
11290                   (progn
11291                     (re-search-forward "^[^ \t]" nil t)
11292                     (forward-line -1)
11293                     (end-of-line)
11294                     (insert " " message-id))
11295                 (insert "References: " message-id "\n"))))
11296           (set-buffer gnus-summary-buffer)
11297           (gnus-summary-unmark-all-processable)
11298           (gnus-summary-update-article child)
11299           (when (gnus-summary-goto-subject (cdr gnus-article-current) nil t)
11300             (gnus-summary-update-secondary-mark (cdr gnus-article-current)))
11301           (gnus-summary-rethread-current)
11302           (gnus-message 3 "Article %d is now the child of article %d"
11303                         child parent))))))
11304
11305 (defun gnus-summary-toggle-threads (&optional arg)
11306   "Toggle showing conversation threads.
11307 If ARG is positive number, turn showing conversation threads on."
11308   (interactive "P")
11309   (let ((current (or (gnus-summary-article-number) gnus-newsgroup-end)))
11310     (setq gnus-show-threads
11311           (if (null arg) (not gnus-show-threads)
11312             (> (prefix-numeric-value arg) 0)))
11313     (gnus-summary-prepare)
11314     (gnus-summary-goto-subject current)
11315     (gnus-message 6 "Threading is now %s" (if gnus-show-threads "on" "off"))
11316     (gnus-summary-position-point)))
11317
11318 (eval-and-compile
11319   (if (fboundp 'remove-overlays)
11320       (defalias 'gnus-remove-overlays 'remove-overlays)
11321     (defun gnus-remove-overlays (beg end name val)
11322       "Clear BEG and END of overlays whose property NAME has value VAL.
11323 For compatibility with XEmacs."
11324       (dolist (ov (gnus-overlays-in beg end))
11325         (when (eq (gnus-overlay-get ov name) val)
11326           (gnus-delete-overlay ov))))))
11327
11328 (defun gnus-summary-show-all-threads ()
11329   "Show all threads."
11330   (interactive)
11331   (gnus-remove-overlays (point-min) (point-max) 'invisible 'gnus-sum)
11332   (gnus-summary-position-point))
11333
11334 (defsubst gnus-summary--inv (p)
11335   (and (eq (get-char-property p 'invisible) 'gnus-sum) p))
11336
11337 (defun gnus-summary-show-thread ()
11338   "Show thread subtrees.
11339 Returns nil if no thread was there to be shown."
11340   (interactive)
11341   (let* ((orig (point))
11342          (end (point-at-eol))
11343          (end (or (gnus-summary--inv end) (gnus-summary--inv (1- end))))
11344          ;; Leave point at bol
11345          (beg (progn (beginning-of-line) (if (bobp) (point) (1- (point)))))
11346          (eoi (when end
11347                 (if (fboundp 'next-single-char-property-change)
11348                     (or (next-single-char-property-change end 'invisible)
11349                         (point-max))
11350                   (while (progn
11351                            (end-of-line 2)
11352                            (and (not (eobp))
11353                                 (eq (get-char-property (point) 'invisible)
11354                                     'gnus-sum))))
11355                   (point)))))
11356     (when eoi
11357       (gnus-remove-overlays beg eoi 'invisible 'gnus-sum)
11358       (goto-char orig)
11359       (gnus-summary-position-point)
11360       eoi)))
11361
11362 (defun gnus-summary-maybe-hide-threads ()
11363   "If requested, hide the threads that should be hidden."
11364   (when (and gnus-show-threads
11365              gnus-thread-hide-subtree)
11366     (gnus-summary-hide-all-threads
11367      (if (or (consp gnus-thread-hide-subtree)
11368              (functionp gnus-thread-hide-subtree))
11369          (gnus-make-predicate gnus-thread-hide-subtree)
11370        nil))))
11371
11372 ;;; Hiding predicates.
11373
11374 (defun gnus-article-unread-p (header)
11375   (memq (mail-header-number header) gnus-newsgroup-unreads))
11376
11377 (defun gnus-article-unseen-p (header)
11378   (memq (mail-header-number header) gnus-newsgroup-unseen))
11379
11380 (defun gnus-map-articles (predicate articles)
11381   "Map PREDICATE over ARTICLES and return non-nil if any predicate is non-nil."
11382   (apply 'gnus-or (mapcar predicate
11383                           (mapcar (lambda (number)
11384                                     (gnus-summary-article-header number))
11385                                   articles))))
11386
11387 (defun gnus-summary-hide-all-threads (&optional predicate)
11388   "Hide all thread subtrees.
11389 If PREDICATE is supplied, threads that satisfy this predicate
11390 will not be hidden."
11391   (interactive)
11392   (save-excursion
11393     (goto-char (point-min))
11394     (let ((end nil))
11395       (while (not end)
11396         (when (or (not predicate)
11397                   (gnus-map-articles
11398                    predicate (gnus-summary-article-children)))
11399             (gnus-summary-hide-thread))
11400         (setq end (not (zerop (gnus-summary-next-thread 1 t)))))))
11401   (gnus-summary-position-point))
11402
11403 (defun gnus-summary-hide-thread ()
11404   "Hide thread subtrees.
11405 If PREDICATE is supplied, threads that satisfy this predicate
11406 will not be hidden.
11407 Returns nil if no threads were there to be hidden."
11408   (interactive)
11409   (let ((start (point))
11410         (starteol (line-end-position))
11411         (article (gnus-summary-article-number)))
11412     (goto-char start)
11413     ;; Go forward until either the buffer ends or the subthread ends.
11414     (when (and (not (eobp))
11415                (or (zerop (gnus-summary-next-thread 1 t))
11416                    (goto-char (point-max))))
11417       (if (and (> (point) start)
11418                ;; FIXME: this should actually search for a non-invisible \n.
11419                (search-backward "\n" start t))
11420           (progn
11421             (when (> (point) starteol)
11422               (gnus-remove-overlays starteol (point) 'invisible 'gnus-sum)
11423               (let ((ol (gnus-make-overlay starteol (point) nil t nil)))
11424                 (gnus-overlay-put ol 'invisible 'gnus-sum)
11425                 (gnus-overlay-put ol 'evaporate t)))
11426             (gnus-summary-goto-subject article))
11427         (goto-char start)
11428         nil))))
11429
11430 (defun gnus-summary-go-to-next-thread (&optional previous)
11431   "Go to the same level (or less) next thread.
11432 If PREVIOUS is non-nil, go to previous thread instead.
11433 Return the article number moved to, or nil if moving was impossible."
11434   (let ((level (gnus-summary-thread-level))
11435         (way (if previous -1 1))
11436         (beg (point)))
11437     (forward-line way)
11438     (while (and (not (eobp))
11439                 (< level (gnus-summary-thread-level)))
11440       (forward-line way))
11441     (if (eobp)
11442         (progn
11443           (goto-char beg)
11444           nil)
11445       (setq beg (point))
11446       (prog1
11447           (gnus-summary-article-number)
11448         (goto-char beg)))))
11449
11450 (defun gnus-summary-next-thread (n &optional silent)
11451   "Go to the same level next N'th thread.
11452 If N is negative, search backward instead.
11453 Returns the difference between N and the number of skips actually
11454 done.
11455
11456 If SILENT, don't output messages."
11457   (interactive "p")
11458   (let ((backward (< n 0))
11459         (n (abs n)))
11460     (while (and (> n 0)
11461                 (gnus-summary-go-to-next-thread backward))
11462       (decf n))
11463     (unless silent
11464       (gnus-summary-position-point))
11465     (when (and (not silent) (/= 0 n))
11466       (gnus-message 7 "No more threads"))
11467     n))
11468
11469 (defun gnus-summary-prev-thread (n)
11470   "Go to the same level previous N'th thread.
11471 Returns the difference between N and the number of skips actually
11472 done."
11473   (interactive "p")
11474   (gnus-summary-next-thread (- n)))
11475
11476 (defun gnus-summary-go-down-thread ()
11477   "Go down one level in the current thread."
11478   (let ((children (gnus-summary-article-children)))
11479     (when children
11480       (gnus-summary-goto-subject (car children)))))
11481
11482 (defun gnus-summary-go-up-thread ()
11483   "Go up one level in the current thread."
11484   (let ((parent (gnus-summary-article-parent)))
11485     (when parent
11486       (gnus-summary-goto-subject parent))))
11487
11488 (defun gnus-summary-down-thread (n)
11489   "Go down thread N steps.
11490 If N is negative, go up instead.
11491 Returns the difference between N and how many steps down that were
11492 taken."
11493   (interactive "p")
11494   (let ((up (< n 0))
11495         (n (abs n)))
11496     (while (and (> n 0)
11497                 (if up (gnus-summary-go-up-thread)
11498                   (gnus-summary-go-down-thread)))
11499       (setq n (1- n)))
11500     (gnus-summary-position-point)
11501     (when (/= 0 n)
11502       (gnus-message 7 "Can't go further"))
11503     n))
11504
11505 (defun gnus-summary-up-thread (n)
11506   "Go up thread N steps.
11507 If N is negative, go down instead.
11508 Returns the difference between N and how many steps down that were
11509 taken."
11510   (interactive "p")
11511   (gnus-summary-down-thread (- n)))
11512
11513 (defun gnus-summary-top-thread ()
11514   "Go to the top of the thread."
11515   (interactive)
11516   (while (gnus-summary-go-up-thread))
11517   (gnus-summary-article-number))
11518
11519 (defun gnus-summary-expire-thread ()
11520   "Mark articles under current thread as expired."
11521   (interactive)
11522   (gnus-summary-kill-thread 0))
11523
11524 (defun gnus-summary-kill-thread (&optional unmark)
11525   "Mark articles under current thread as read.
11526 If the prefix argument is positive, remove any kinds of marks.
11527 If the prefix argument is zero, mark thread as expired.
11528 If the prefix argument is negative, tick articles instead."
11529   (interactive "P")
11530   (when unmark
11531     (setq unmark (prefix-numeric-value unmark)))
11532   (let ((articles (gnus-summary-articles-in-thread))
11533         (hide (or (null unmark) (= unmark 0))))
11534     (save-excursion
11535       ;; Expand the thread.
11536       (gnus-summary-show-thread)
11537       ;; Mark all the articles.
11538       (while articles
11539         (gnus-summary-goto-subject (car articles))
11540         (cond ((null unmark)
11541                (gnus-summary-mark-article-as-read gnus-killed-mark))
11542               ((> unmark 0)
11543                (gnus-summary-mark-article-as-unread gnus-unread-mark))
11544               ((= unmark 0)
11545                (gnus-summary-mark-article nil gnus-expirable-mark))
11546               (t
11547                (gnus-summary-mark-article-as-unread gnus-ticked-mark)))
11548         (setq articles (cdr articles))))
11549     ;; Hide killed subtrees when hide is true.
11550     (and hide
11551          gnus-thread-hide-killed
11552          (gnus-summary-hide-thread))
11553     ;; If hide is t, go to next unread subject.
11554     (when hide
11555       ;; Go to next unread subject.
11556       (gnus-summary-next-subject 1 t)))
11557   (gnus-set-mode-line 'summary))
11558
11559 ;; Summary sorting commands
11560
11561 (defun gnus-summary-sort-by-number (&optional reverse)
11562   "Sort the summary buffer by article number.
11563 Argument REVERSE means reverse order."
11564   (interactive "P")
11565   (gnus-summary-sort 'number reverse))
11566
11567 (defun gnus-summary-sort-by-most-recent-number (&optional reverse)
11568   "Sort the summary buffer by most recent article number.
11569 Argument REVERSE means reverse order."
11570   (interactive "P")
11571   (gnus-summary-sort 'most-recent-number reverse))
11572
11573 (defun gnus-summary-sort-by-random (&optional reverse)
11574   "Randomize the order in the summary buffer.
11575 Argument REVERSE means to randomize in reverse order."
11576   (interactive "P")
11577   (gnus-summary-sort 'random reverse))
11578
11579 (defun gnus-summary-sort-by-author (&optional reverse)
11580   "Sort the summary buffer by author name alphabetically.
11581 If `case-fold-search' is non-nil, case of letters is ignored.
11582 Argument REVERSE means reverse order."
11583   (interactive "P")
11584   (gnus-summary-sort 'author reverse))
11585
11586 (defun gnus-summary-sort-by-recipient (&optional reverse)
11587   "Sort the summary buffer by recipient name alphabetically.
11588 If `case-fold-search' is non-nil, case of letters is ignored.
11589 Argument REVERSE means reverse order."
11590   (interactive "P")
11591   (gnus-summary-sort 'recipient reverse))
11592
11593 (defun gnus-summary-sort-by-subject (&optional reverse)
11594   "Sort the summary buffer by subject alphabetically.  `Re:'s are ignored.
11595 If `case-fold-search' is non-nil, case of letters is ignored.
11596 Argument REVERSE means reverse order."
11597   (interactive "P")
11598   (gnus-summary-sort 'subject reverse))
11599
11600 (defun gnus-summary-sort-by-date (&optional reverse)
11601   "Sort the summary buffer by date.
11602 Argument REVERSE means reverse order."
11603   (interactive "P")
11604   (gnus-summary-sort 'date reverse))
11605
11606 (defun gnus-summary-sort-by-most-recent-date (&optional reverse)
11607   "Sort the summary buffer by most recent date.
11608 Argument REVERSE means reverse order."
11609   (interactive "P")
11610   (gnus-summary-sort 'most-recent-date reverse))
11611
11612 (defun gnus-summary-sort-by-score (&optional reverse)
11613   "Sort the summary buffer by score.
11614 Argument REVERSE means reverse order."
11615   (interactive "P")
11616   (gnus-summary-sort 'score reverse))
11617
11618 (defun gnus-summary-sort-by-lines (&optional reverse)
11619   "Sort the summary buffer by the number of lines.
11620 Argument REVERSE means reverse order."
11621   (interactive "P")
11622   (gnus-summary-sort 'lines reverse))
11623
11624 (defun gnus-summary-sort-by-chars (&optional reverse)
11625   "Sort the summary buffer by article length.
11626 Argument REVERSE means reverse order."
11627   (interactive "P")
11628   (gnus-summary-sort 'chars reverse))
11629
11630 (defun gnus-summary-sort-by-original (&optional reverse)
11631   "Sort the summary buffer using the default sorting method.
11632 Argument REVERSE means reverse order."
11633   (interactive "P")
11634   (let* ((inhibit-read-only t)
11635          (gnus-summary-prepare-hook nil))
11636     ;; We do the sorting by regenerating the threads.
11637     (gnus-summary-prepare)
11638     ;; Hide subthreads if needed.
11639     (gnus-summary-maybe-hide-threads)))
11640
11641 (defun gnus-summary-sort (predicate reverse)
11642   "Sort summary buffer by PREDICATE.  REVERSE means reverse order."
11643   (let* ((thread (intern (format "gnus-thread-sort-by-%s" predicate)))
11644          (article (intern (format "gnus-article-sort-by-%s" predicate)))
11645          (gnus-thread-sort-functions
11646           (if (not reverse)
11647               thread
11648             `(lambda (t1 t2)
11649                (,thread t2 t1))))
11650          (gnus-sort-gathered-threads-function
11651           gnus-thread-sort-functions)
11652          (gnus-article-sort-functions
11653           (if (not reverse)
11654               article
11655             `(lambda (t1 t2)
11656                (,article t2 t1))))
11657          (inhibit-read-only t)
11658          (gnus-summary-prepare-hook nil))
11659     ;; We do the sorting by regenerating the threads.
11660     (gnus-summary-prepare)
11661     ;; Hide subthreads if needed.
11662     (gnus-summary-maybe-hide-threads)))
11663
11664 ;; Summary saving commands.
11665
11666 (defun gnus-summary-save-article (&optional n not-saved)
11667   "Save the current article using the default saver function.
11668 If N is a positive number, save the N next articles.
11669 If N is a negative number, save the N previous articles.
11670 If N is nil and any articles have been marked with the process mark,
11671 save those articles instead.
11672 The variable `gnus-default-article-saver' specifies the saver function.
11673
11674 If the optional second argument NOT-SAVED is non-nil, articles saved
11675 will not be marked as saved."
11676   (interactive "P")
11677   (require 'gnus-art)
11678   (let* ((articles (gnus-summary-work-articles n))
11679          (save-buffer (save-excursion
11680                         (nnheader-set-temp-buffer " *Gnus Save*")))
11681          (num (length articles))
11682          ;; Whether to save decoded articles or raw articles.
11683          (decode (when gnus-article-save-coding-system
11684                    (get gnus-default-article-saver :decode)))
11685          ;; When saving many articles in a single file, use the other
11686          ;; function to save articles other than the first one.
11687          (saver2 (get gnus-default-article-saver :function))
11688          (gnus-prompt-before-saving (if saver2
11689                                         t
11690                                       gnus-prompt-before-saving))
11691          (gnus-default-article-saver gnus-default-article-saver)
11692          header file)
11693     (dolist (article articles)
11694       (setq header (gnus-summary-article-header article))
11695       (if (not (vectorp header))
11696           ;; This is a pseudo-article.
11697           (if (assq 'name header)
11698               (gnus-copy-file (cdr (assq 'name header)))
11699             (gnus-message 1 "Article %d is unsaveable" article))
11700         ;; This is a real article.
11701         (save-window-excursion
11702           (gnus-summary-select-article decode decode nil article)
11703           (gnus-summary-goto-subject article))
11704         (with-current-buffer save-buffer
11705           (erase-buffer)
11706           (insert-buffer-substring (if decode
11707                                        gnus-article-buffer
11708                                      gnus-original-article-buffer)))
11709         (setq file (gnus-article-save save-buffer file num))
11710         (gnus-summary-remove-process-mark article)
11711         (unless not-saved
11712           (gnus-summary-set-saved-mark article)))
11713       (when saver2
11714         (setq gnus-default-article-saver saver2
11715               saver2 nil)))
11716     (gnus-kill-buffer save-buffer)
11717     (gnus-summary-position-point)
11718     (gnus-set-mode-line 'summary)
11719     n))
11720
11721 (defun gnus-summary-pipe-output (&optional n sym)
11722   "Pipe the current article to a subprocess.
11723 If N is a positive number, pipe the N next articles.
11724 If N is a negative number, pipe the N previous articles.
11725 If N is nil and any articles have been marked with the process mark,
11726 pipe those articles instead.
11727 The default command to which articles are piped is specified by the
11728 variable `gnus-summary-pipe-output-default-command'; if it is nil, you
11729 will be prompted for the command.
11730
11731 The properties `:decode' and `:headers' that are put to the function
11732 symbol `gnus-summary-save-in-pipe' control whether this function
11733 decodes articles and what headers to keep (see the doc string for the
11734 `gnus-default-article-saver' variable).  If SYM (the symbolic prefix)
11735 is neither omitted nor the symbol `r', force including all headers
11736 regardless of the `:headers' property.  If it is the symbol `r',
11737 articles that are not decoded and include all headers will be piped
11738 no matter what the properties `:decode' and `:headers' are."
11739   (interactive (gnus-interactive "P\ny"))
11740   (require 'gnus-art)
11741   (let* ((articles (gnus-summary-work-articles n))
11742          (result-buffer "*Shell Command Output*")
11743          (all-headers (not (memq sym '(nil r))))
11744          (gnus-save-all-headers (or all-headers gnus-save-all-headers))
11745          (raw (eq sym 'r))
11746          (headers (get 'gnus-summary-save-in-pipe :headers))
11747          command result)
11748     (unless (numberp (car articles))
11749       (error "No article to pipe"))
11750     (setq command (gnus-read-shell-command
11751                    (concat "Shell command on "
11752                            (if (cdr articles)
11753                                (format "these %d articles" (length articles))
11754                              "this article")
11755                            ": ")
11756                    gnus-summary-pipe-output-default-command))
11757     (when (string-equal command "")
11758       (error "A command is required"))
11759     (when all-headers
11760       (put 'gnus-summary-save-in-pipe :headers nil))
11761     (unwind-protect
11762         (while articles
11763           (gnus-summary-goto-subject (pop articles))
11764           (save-window-excursion (gnus-summary-save-in-pipe command raw))
11765           (when (and (get-buffer result-buffer)
11766                      (not (zerop (buffer-size (get-buffer result-buffer)))))
11767             (setq result (concat result (with-current-buffer result-buffer
11768                                           (buffer-string))))))
11769       (put 'gnus-summary-save-in-pipe :headers headers))
11770     (unless (zerop (length result))
11771       (if (with-current-buffer (get-buffer-create result-buffer)
11772             (erase-buffer)
11773             (insert result)
11774             (prog1
11775                 (and (= (count-lines (point-min) (point)) 1)
11776                      (progn
11777                        (end-of-line 0)
11778                        (<= (current-column)
11779                            (window-width (minibuffer-window)))))
11780               (goto-char (point-min))))
11781           (message "%s" (substring result 0 -1))
11782         (message nil)
11783         (gnus-configure-windows 'pipe)))))
11784
11785 (defun gnus-summary-save-article-mail (&optional arg)
11786   "Append the current article to a Unix mail box 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-mail))
11794     (gnus-summary-save-article arg)))
11795
11796 (defun gnus-summary-save-article-rmail (&optional arg)
11797   "Append the current article to an rmail 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-rmail))
11805     (gnus-summary-save-article arg)))
11806
11807 (defun gnus-summary-save-article-file (&optional arg)
11808   "Append the current article to a 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-save-in-file))
11816     (gnus-summary-save-article arg)))
11817
11818 (defun gnus-summary-write-article-file (&optional arg)
11819   "Write the current article to a file, deleting the previous 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-write-to-file))
11827     (gnus-summary-save-article arg)))
11828
11829 (defun gnus-summary-save-article-body-file (&optional arg)
11830   "Append the current article body to a 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-save-body-in-file))
11838     (gnus-summary-save-article arg)))
11839
11840 (defun gnus-summary-write-article-body-file (&optional arg)
11841   "Write the current article body to a file, deleting the previous file.
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-write-body-to-file))
11849     (gnus-summary-save-article arg)))
11850
11851 (defun gnus-summary-muttprint (&optional arg)
11852   "Print the current article using Muttprint.
11853 If N is a positive number, save the N next articles.
11854 If N is a negative number, save the N previous articles.
11855 If N is nil and any articles have been marked with the process mark,
11856 save those articles instead."
11857   (interactive "P")
11858   (require 'gnus-art)
11859   (let ((gnus-default-article-saver 'gnus-summary-pipe-to-muttprint))
11860     (gnus-summary-save-article arg t)))
11861
11862 (defun gnus-summary-pipe-message (program)
11863   "Pipe the current article through PROGRAM."
11864   (interactive "sProgram: ")
11865   (gnus-summary-select-article)
11866   (let ((mail-header-separator ""))
11867     (gnus-eval-in-buffer-window gnus-article-buffer
11868       (save-restriction
11869         (widen)
11870         (let ((start (window-start))
11871               (inhibit-read-only t))
11872           (message-pipe-buffer-body program)
11873           (set-window-start (get-buffer-window (current-buffer)) start))))))
11874
11875 (defun gnus-get-split-value (methods)
11876   "Return a value based on the split METHODS."
11877   (let (split-name method result match)
11878     (when methods
11879       (with-current-buffer gnus-original-article-buffer
11880         (save-restriction
11881           (nnheader-narrow-to-headers)
11882           (while (and methods (not split-name))
11883             (goto-char (point-min))
11884             (setq method (pop methods))
11885             (setq match (car method))
11886             (when (cond
11887                    ((stringp match)
11888                     ;; Regular expression.
11889                     (ignore-errors
11890                       (re-search-forward match nil t)))
11891                    ((functionp match)
11892                     ;; Function.
11893                     (save-restriction
11894                       (widen)
11895                       (setq result (funcall match gnus-newsgroup-name))))
11896                    ((consp match)
11897                     ;; Form.
11898                     (save-restriction
11899                       (widen)
11900                       (setq result (eval match)))))
11901               (setq split-name (cdr method))
11902               (cond ((stringp result)
11903                      (push (expand-file-name
11904                             result gnus-article-save-directory)
11905                            split-name))
11906                     ((consp result)
11907                      (setq split-name (append result split-name)))))))))
11908     (nreverse split-name)))
11909
11910 (defun gnus-valid-move-group-p (group)
11911   (and (symbolp group)
11912        (boundp group)
11913        (symbol-name group)
11914        (symbol-value group)
11915        (gnus-get-function (gnus-find-method-for-group
11916                            (symbol-name group)) 'request-accept-article t)))
11917
11918 (defun gnus-read-move-group-name (prompt default articles prefix)
11919   "Read a group name."
11920   (let* ((split-name (gnus-get-split-value gnus-move-split-methods))
11921          (minibuffer-confirm-incomplete nil) ; XEmacs
11922          (prom
11923           (format "%s %s to"
11924                   prompt
11925                   (if (> (length articles) 1)
11926                       (format "these %d articles" (length articles))
11927                     "this article")))
11928          (to-newsgroup
11929           (cond
11930            ((null split-name)
11931             (gnus-group-completing-read
11932              prom
11933              (gnus-remove-if-not 'gnus-valid-move-group-p gnus-active-hashtb t)
11934              nil prefix nil default))
11935            ((= 1 (length split-name))
11936             (gnus-group-completing-read
11937              prom
11938              (gnus-remove-if-not 'gnus-valid-move-group-p gnus-active-hashtb t)
11939              nil prefix 'gnus-group-history (car split-name)))
11940            (t
11941             (gnus-completing-read
11942              prom (nreverse split-name) nil nil 'gnus-group-history))))
11943          (to-method (gnus-server-to-method (gnus-group-method to-newsgroup)))
11944          encoded)
11945     (when to-newsgroup
11946       (if (or (string= to-newsgroup "")
11947               (string= to-newsgroup prefix))
11948           (setq to-newsgroup default))
11949       (unless to-newsgroup
11950         (error "No group name entered"))
11951       (setq encoded (mm-encode-coding-string
11952                      to-newsgroup
11953                      (gnus-group-name-charset to-method to-newsgroup)))
11954       (or (gnus-active encoded)
11955           (gnus-activate-group encoded nil nil to-method)
11956           (if (gnus-y-or-n-p (format "No such group: %s.  Create it? "
11957                                      to-newsgroup))
11958               (or (and (gnus-request-create-group encoded to-method)
11959                        (gnus-activate-group encoded nil nil to-method)
11960                        (gnus-subscribe-group encoded))
11961                   (error "Couldn't create group %s" to-newsgroup)))
11962           (error "No such group: %s" to-newsgroup))
11963       encoded)))
11964
11965 (defvar gnus-summary-save-parts-counter)
11966 (declare-function mm-uu-dissect "mm-uu" (&optional noheader mime-type))
11967
11968 (defun gnus-summary-save-parts (type dir n &optional reverse)
11969   "Save parts matching TYPE to DIR.
11970 If REVERSE, save parts that do not match TYPE."
11971   (interactive
11972    (list (read-string "Save parts of type: "
11973                       (or (car gnus-summary-save-parts-type-history)
11974                           gnus-summary-save-parts-default-mime)
11975                       'gnus-summary-save-parts-type-history)
11976          (setq gnus-summary-save-parts-last-directory
11977                (read-file-name "Save to directory: "
11978                                gnus-summary-save-parts-last-directory
11979                                nil t))
11980          current-prefix-arg))
11981   (gnus-summary-iterate n
11982     (let ((gnus-display-mime-function nil)
11983           gnus-article-prepare-hook
11984           gnus-article-decode-hook
11985           gnus-display-mime-function
11986           gnus-break-pages
11987           (gnus-inhibit-treatment t))
11988       (gnus-summary-select-article))
11989     (with-current-buffer gnus-article-buffer
11990       (let ((handles (or gnus-article-mime-handles
11991                          (mm-dissect-buffer nil gnus-article-loose-mime)
11992                          (and gnus-article-emulate-mime
11993                               (mm-uu-dissect))))
11994             (gnus-summary-save-parts-counter 1))
11995         (when handles
11996           (gnus-summary-save-parts-1 type dir handles reverse)
11997           (unless gnus-article-mime-handles ;; Don't destroy this case.
11998             (mm-destroy-parts handles)))))))
11999
12000 (defun gnus-summary-save-parts-1 (type dir handle reverse)
12001   (if (stringp (car handle))
12002       (mapcar (lambda (h) (gnus-summary-save-parts-1 type dir h reverse))
12003               (cdr handle))
12004     (when (if reverse
12005               (not (string-match type (mm-handle-media-type handle)))
12006             (string-match type (mm-handle-media-type handle)))
12007       (let ((file (expand-file-name
12008                    (gnus-map-function
12009                     mm-file-name-rewrite-functions
12010                     (file-name-nondirectory
12011                      (or
12012                       (mail-content-type-get
12013                        (mm-handle-disposition handle) 'filename)
12014                       (mail-content-type-get
12015                        (mm-handle-type handle) 'name)
12016                       (format "%s.%d.%d" gnus-newsgroup-name
12017                               (cdr gnus-article-current)
12018                               gnus-summary-save-parts-counter))))
12019                    dir)))
12020         (incf gnus-summary-save-parts-counter)
12021         (unless (file-exists-p file)
12022           (mm-save-part-to-file handle file))))))
12023
12024 ;; Summary extract commands
12025
12026 (defun gnus-summary-insert-pseudos (pslist &optional not-view)
12027   (let ((inhibit-read-only t)
12028         (article (gnus-summary-article-number))
12029         after-article b e)
12030     (unless (gnus-summary-goto-subject article)
12031       (error "No such article: %d" article))
12032     (gnus-summary-position-point)
12033     ;; If all commands are to be bunched up on one line, we collect
12034     ;; them here.
12035     (unless gnus-view-pseudos-separately
12036       (let ((ps (setq pslist (sort pslist 'gnus-pseudos<)))
12037             files action)
12038         (while ps
12039           (setq action (cdr (assq 'action (car ps))))
12040           (setq files (list (cdr (assq 'name (car ps)))))
12041           (while (and ps (cdr ps)
12042                       (string= (or action "1")
12043                                (or (cdr (assq 'action (cadr ps))) "2")))
12044             (push (cdr (assq 'name (cadr ps))) files)
12045             (setcdr ps (cddr ps)))
12046           (when files
12047             (when (not (string-match "%s" action))
12048               (push " " files))
12049             (push " " files)
12050             (when (assq 'execute (car ps))
12051               (setcdr (assq 'execute (car ps))
12052                       (funcall (if (string-match "%s" action)
12053                                    'format 'concat)
12054                                action
12055                                (mapconcat
12056                                 (lambda (f)
12057                                   (if (equal f " ")
12058                                       f
12059                                     (shell-quote-argument f)))
12060                                 files " ")))))
12061           (setq ps (cdr ps)))))
12062     (if (and gnus-view-pseudos (not not-view))
12063         (while pslist
12064           (when (assq 'execute (car pslist))
12065             (gnus-execute-command (cdr (assq 'execute (car pslist)))
12066                                   (eq gnus-view-pseudos 'not-confirm)))
12067           (setq pslist (cdr pslist)))
12068       (save-excursion
12069         (while pslist
12070           (setq after-article (or (cdr (assq 'article (car pslist)))
12071                                   (gnus-summary-article-number)))
12072           (gnus-summary-goto-subject after-article)
12073           (forward-line 1)
12074           (setq b (point))
12075           (insert "    " (file-name-nondirectory
12076                           (cdr (assq 'name (car pslist))))
12077                   ": " (or (cdr (assq 'execute (car pslist))) "") "\n")
12078           (setq e (point))
12079           (forward-line -1)             ; back to `b'
12080           (gnus-add-text-properties
12081            b (1- e) (list 'gnus-number gnus-reffed-article-number
12082                           gnus-mouse-face-prop gnus-mouse-face))
12083           (gnus-data-enter
12084            after-article gnus-reffed-article-number
12085            gnus-unread-mark b (car pslist) 0 (- e b))
12086           (setq gnus-newsgroup-unreads
12087                 (gnus-add-to-sorted-list gnus-newsgroup-unreads
12088                                          gnus-reffed-article-number))
12089           (setq gnus-reffed-article-number (1- gnus-reffed-article-number))
12090           (setq pslist (cdr pslist)))))))
12091
12092 (defun gnus-pseudos< (p1 p2)
12093   (let ((c1 (cdr (assq 'action p1)))
12094         (c2 (cdr (assq 'action p2))))
12095     (and c1 c2 (string< c1 c2))))
12096
12097 (defun gnus-request-pseudo-article (props)
12098   (cond ((assq 'execute props)
12099          (gnus-execute-command (cdr (assq 'execute props)))))
12100   (let ((gnus-current-article (gnus-summary-article-number)))
12101     (gnus-run-hooks 'gnus-mark-article-hook)))
12102
12103 (defun gnus-execute-command (command &optional automatic)
12104   (save-excursion
12105     (gnus-article-setup-buffer)
12106     (set-buffer gnus-article-buffer)
12107     (setq buffer-read-only nil)
12108     (let ((command (if automatic command
12109                      (read-string "Command: " (cons command 0)))))
12110       (erase-buffer)
12111       (insert "$ " command "\n\n")
12112       (if gnus-view-pseudo-asynchronously
12113           (start-process "gnus-execute" (current-buffer) shell-file-name
12114                          shell-command-switch command)
12115         (call-process shell-file-name nil t nil
12116                       shell-command-switch command)))))
12117
12118 ;; Summary kill commands.
12119
12120 (defun gnus-summary-edit-global-kill (article)
12121   "Edit the \"global\" kill file."
12122   (interactive (list (gnus-summary-article-number)))
12123   (gnus-group-edit-global-kill article))
12124
12125 (defun gnus-summary-edit-local-kill ()
12126   "Edit a local kill file applied to the current newsgroup."
12127   (interactive)
12128   (setq gnus-current-headers (gnus-summary-article-header))
12129   (gnus-group-edit-local-kill
12130    (gnus-summary-article-number) gnus-newsgroup-name))
12131
12132 ;;; Header reading.
12133
12134 (defun gnus-read-header (id &optional header)
12135   "Read the headers of article ID and enter them into the Gnus system."
12136   (let ((group gnus-newsgroup-name)
12137         (gnus-override-method
12138          (or
12139           gnus-override-method
12140           (and (gnus-news-group-p gnus-newsgroup-name)
12141                (car (gnus-refer-article-methods)))))
12142         where)
12143     ;; First we check to see whether the header in question is already
12144     ;; fetched.
12145     (if (stringp id)
12146         ;; This is a Message-ID.
12147         (setq header (or header (gnus-id-to-header id)))
12148       ;; This is an article number.
12149       (setq header (or header (gnus-summary-article-header id))))
12150     (if (and header
12151              (not (gnus-summary-article-sparse-p (mail-header-number header))))
12152         ;; We have found the header.
12153         header
12154       ;; We have to really fetch the header to this article.
12155       (with-current-buffer nntp-server-buffer
12156         (when (setq where (gnus-request-head id group))
12157           (nnheader-fold-continuation-lines)
12158           (goto-char (point-max))
12159           (insert ".\n")
12160           (goto-char (point-min))
12161           (insert "211 ")
12162           (princ (cond
12163                   ((numberp id) id)
12164                   ((cdr where) (cdr where))
12165                   (header (mail-header-number header))
12166                   (t gnus-reffed-article-number))
12167                  (current-buffer))
12168           (insert " Article retrieved.\n"))
12169         (if (or (not where)
12170                 (not (setq header (car (gnus-get-newsgroup-headers nil t)))))
12171             ()                          ; Malformed head.
12172           (unless (gnus-summary-article-sparse-p (mail-header-number header))
12173             (when (and (stringp id)
12174                        (or
12175                         (not (string= (gnus-group-real-name group)
12176                                       (car where)))
12177                         (not (gnus-server-equal gnus-override-method
12178                                                 (gnus-group-method group)))))
12179               ;; If we fetched by Message-ID and the article came from
12180               ;; a different group (or server), we fudge some bogus
12181               ;; article numbers for this article.
12182               (mail-header-set-number header gnus-reffed-article-number))
12183             (with-current-buffer gnus-summary-buffer
12184               (decf gnus-reffed-article-number)
12185               (gnus-remove-header (mail-header-number header))
12186               (push header gnus-newsgroup-headers)
12187               (setq gnus-current-headers header)
12188               (push (mail-header-number header) gnus-newsgroup-limit)))
12189           header)))))
12190
12191 (defun gnus-remove-header (number)
12192   "Remove header NUMBER from `gnus-newsgroup-headers'."
12193   (if (and gnus-newsgroup-headers
12194            (= number (mail-header-number (car gnus-newsgroup-headers))))
12195       (pop gnus-newsgroup-headers)
12196     (let ((headers gnus-newsgroup-headers))
12197       (while (and (cdr headers)
12198                   (not (= number (mail-header-number (cadr headers)))))
12199         (pop headers))
12200       (when (cdr headers)
12201         (setcdr headers (cddr headers))))))
12202
12203 ;;;
12204 ;;; summary highlights
12205 ;;;
12206
12207 (defun gnus-highlight-selected-summary ()
12208   "Highlight selected article in summary buffer."
12209   ;; Added by Per Abrahamsen <amanda@iesd.auc.dk>.
12210   (when gnus-summary-selected-face
12211     (save-excursion
12212       (let* ((beg (point-at-bol))
12213              (end (point-at-eol))
12214              ;; Fix by Mike Dugan <dugan@bucrf16.bu.edu>.
12215              (from (if (get-text-property beg gnus-mouse-face-prop)
12216                        beg
12217                      (or (next-single-property-change
12218                           beg gnus-mouse-face-prop nil end)
12219                          beg)))
12220              (to
12221               (if (= from end)
12222                   (- from 2)
12223                 (or (next-single-property-change
12224                      from gnus-mouse-face-prop nil end)
12225                     end))))
12226         ;; If no mouse-face prop on line we will have to = from = end,
12227         ;; so we highlight the entire line instead.
12228         (when (= (+ to 2) from)
12229           (setq from beg)
12230           (setq to end))
12231         (if gnus-newsgroup-selected-overlay
12232             ;; Move old overlay.
12233             (gnus-move-overlay
12234              gnus-newsgroup-selected-overlay from to (current-buffer))
12235           ;; Create new overlay.
12236           (gnus-overlay-put
12237            (setq gnus-newsgroup-selected-overlay (gnus-make-overlay from to))
12238            'face gnus-summary-selected-face))))))
12239
12240 (defvar gnus-summary-highlight-line-cached nil)
12241 (defvar gnus-summary-highlight-line-trigger nil)
12242
12243 (defun gnus-summary-highlight-line-0 ()
12244   (if (and (eq gnus-summary-highlight-line-trigger
12245                gnus-summary-highlight)
12246            gnus-summary-highlight-line-cached)
12247       gnus-summary-highlight-line-cached
12248     (setq gnus-summary-highlight-line-trigger gnus-summary-highlight
12249           gnus-summary-highlight-line-cached
12250           (let* ((cond (list 'cond))
12251                  (c cond)
12252                  (list gnus-summary-highlight))
12253             (while list
12254               (setcdr c (cons (list (caar list) (list 'quote (cdar list)))
12255                               nil))
12256               (setq c (cdr c)
12257                     list (cdr list)))
12258             (gnus-byte-compile (list 'lambda nil cond))))))
12259
12260 (defun gnus-summary-highlight-line ()
12261   "Highlight current line according to `gnus-summary-highlight'."
12262   (let* ((beg (point-at-bol))
12263          (article (or (gnus-summary-article-number) gnus-current-article))
12264          (score (or (cdr (assq article
12265                                gnus-newsgroup-scored))
12266                     gnus-summary-default-score 0))
12267          (mark (or (gnus-summary-article-mark) gnus-unread-mark))
12268          (inhibit-read-only t)
12269          (default gnus-summary-default-score)
12270          (default-high gnus-summary-default-high-score)
12271          (default-low gnus-summary-default-low-score)
12272          (uncached (and gnus-summary-use-undownloaded-faces
12273                         (memq article gnus-newsgroup-undownloaded)
12274                         (not (memq article gnus-newsgroup-cached)))))
12275     (let ((face (funcall (gnus-summary-highlight-line-0))))
12276       (unless (eq face (get-text-property beg 'face))
12277         (gnus-put-text-property-excluding-characters-with-faces
12278          beg (point-at-eol) 'face
12279          (setq face (if (boundp face) (symbol-value face) face)))
12280         (when gnus-summary-highlight-line-function
12281           (funcall gnus-summary-highlight-line-function article face))))))
12282
12283 (defun gnus-update-read-articles (group unread &optional compute)
12284   "Update the list of read articles in GROUP.
12285 UNREAD is a sorted list."
12286   (let ((active (or gnus-newsgroup-active (gnus-active group)))
12287         (info (gnus-get-info group))
12288         (prev 1)
12289         read)
12290     (if (or (not info) (not active))
12291         ;; There is no info on this group if it was, in fact,
12292         ;; killed.  Gnus stores no information on killed groups, so
12293         ;; there's nothing to be done.
12294         ;; One could store the information somewhere temporarily,
12295         ;; perhaps...  Hmmm...
12296         ()
12297       ;; Remove any negative articles numbers.
12298       (while (and unread (< (car unread) 0))
12299         (setq unread (cdr unread)))
12300       ;; Remove any expired article numbers
12301       (while (and unread (< (car unread) (car active)))
12302         (setq unread (cdr unread)))
12303       ;; Compute the ranges of read articles by looking at the list of
12304       ;; unread articles.
12305       (while unread
12306         (when (/= (car unread) prev)
12307           (push (if (= prev (1- (car unread))) prev
12308                   (cons prev (1- (car unread))))
12309                 read))
12310         (setq prev (1+ (car unread)))
12311         (setq unread (cdr unread)))
12312       (when (<= prev (cdr active))
12313         (push (cons prev (cdr active)) read))
12314       (setq read (if (> (length read) 1) (nreverse read) read))
12315       (if compute
12316           read
12317         (save-excursion
12318           (let (setmarkundo)
12319             ;; Propagate the read marks to the backend.
12320             (when (and gnus-propagate-marks
12321                        (gnus-check-backend-function 'request-set-mark group))
12322               (let ((del (gnus-remove-from-range (gnus-info-read info) read))
12323                     (add (gnus-remove-from-range read (gnus-info-read info))))
12324                 (when (or add del)
12325                   (unless (gnus-check-group group)
12326                     (error "Can't open server for %s" group))
12327                   (gnus-request-set-mark
12328                    group (delq nil (list (if add (list add 'add '(read)))
12329                                          (if del (list del 'del '(read))))))
12330                   (setq setmarkundo
12331                         `(gnus-request-set-mark
12332                           ,group
12333                           ',(delq nil (list
12334                                        (if del (list del 'add '(read)))
12335                                        (if add (list add 'del '(read))))))))))
12336             (set-buffer gnus-group-buffer)
12337             (gnus-undo-register
12338               `(progn
12339                  (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
12340                  (gnus-info-set-read ',info ',(gnus-info-read info))
12341                  (gnus-get-unread-articles-in-group ',info
12342                                                     (gnus-active ,group))
12343                  (gnus-group-update-group ,group t)
12344                  ,setmarkundo))))
12345         ;; Enter this list into the group info.
12346         (gnus-info-set-read info read)
12347         ;; Set the number of unread articles in gnus-newsrc-hashtb.
12348         (gnus-get-unread-articles-in-group info (gnus-active group))
12349         t))))
12350
12351 (defun gnus-offer-save-summaries ()
12352   "Offer to save all active summary buffers."
12353   (let (buffers)
12354     ;; Go through all buffers and find all summaries.
12355     (dolist (buffer (buffer-list))
12356       (when (and (setq buffer (buffer-name buffer))
12357                  (string-match "Summary" buffer)
12358                  (with-current-buffer buffer
12359                    ;; We check that this is, indeed, a summary buffer.
12360                    (and (eq major-mode 'gnus-summary-mode)
12361                         ;; Also make sure this isn't bogus.
12362                         gnus-newsgroup-prepared
12363                         ;; Also make sure that this isn't a
12364                         ;; dead summary buffer.
12365                         (not gnus-dead-summary-mode))))
12366         (push buffer buffers)))
12367     ;; Go through all these summary buffers and offer to save them.
12368     (when buffers
12369       (save-excursion
12370         (map-y-or-n-p
12371          "Update summary buffer %s? "
12372          (lambda (buf)
12373            (switch-to-buffer buf)
12374            (gnus-summary-exit))
12375          buffers)))))
12376
12377 (defun gnus-summary-setup-default-charset ()
12378   "Setup newsgroup default charset."
12379   (if (member gnus-newsgroup-name '("nndraft:delayed" "nndraft:drafts"))
12380       (setq gnus-newsgroup-charset nil)
12381     (let* ((ignored-charsets
12382             (or gnus-newsgroup-ephemeral-ignored-charsets
12383                 (append
12384                  (and gnus-newsgroup-name
12385                       (gnus-parameter-ignored-charsets gnus-newsgroup-name))
12386                  gnus-newsgroup-ignored-charsets))))
12387       (setq gnus-newsgroup-charset
12388             (or gnus-newsgroup-ephemeral-charset
12389                 (and gnus-newsgroup-name
12390                      (gnus-parameter-charset gnus-newsgroup-name))
12391                 gnus-default-charset))
12392       (set (make-local-variable 'gnus-newsgroup-ignored-charsets)
12393            ignored-charsets))))
12394
12395 ;;;
12396 ;;; Mime Commands
12397 ;;;
12398
12399 (defun gnus-summary-display-buttonized (&optional show-all-parts)
12400   "Display the current article buffer fully MIME-buttonized.
12401 If SHOW-ALL-PARTS (the prefix) is non-nil, all multipart/* parts are
12402 treated as multipart/mixed."
12403   (interactive "P")
12404   (require 'gnus-art)
12405   (let ((gnus-unbuttonized-mime-types nil)
12406         (gnus-mime-display-multipart-as-mixed show-all-parts))
12407     (gnus-summary-show-article)))
12408
12409 (defun gnus-summary-repair-multipart (article)
12410   "Add a Content-Type header to a multipart article without one."
12411   (interactive (list (gnus-summary-article-number)))
12412   (gnus-with-article article
12413     (message-narrow-to-head)
12414     (message-remove-header "Mime-Version")
12415     (goto-char (point-max))
12416     (insert "Mime-Version: 1.0\n")
12417     (widen)
12418     (when (search-forward "\n--" nil t)
12419       (let ((separator (buffer-substring (point) (point-at-eol))))
12420         (message-narrow-to-head)
12421         (message-remove-header "Content-Type")
12422         (goto-char (point-max))
12423         (insert (format "Content-Type: multipart/mixed; boundary=\"%s\"\n"
12424                         separator))
12425         (widen))))
12426   (let (gnus-mark-article-hook)
12427     (gnus-summary-select-article t t nil article)))
12428
12429 (defun gnus-summary-toggle-display-buttonized ()
12430   "Toggle the buttonizing of the article buffer."
12431   (interactive)
12432   (require 'gnus-art)
12433   (if (setq gnus-inhibit-mime-unbuttonizing
12434             (not gnus-inhibit-mime-unbuttonizing))
12435       (let ((gnus-unbuttonized-mime-types nil))
12436         (gnus-summary-show-article))
12437     (gnus-summary-show-article)))
12438
12439 ;;;
12440 ;;; Generic summary marking commands
12441 ;;;
12442
12443 (defvar gnus-summary-marking-alist
12444   '((read gnus-del-mark "d")
12445     (unread gnus-unread-mark "u")
12446     (ticked gnus-ticked-mark "!")
12447     (dormant gnus-dormant-mark "?")
12448     (expirable gnus-expirable-mark "e"))
12449   "An alist of names/marks/keystrokes.")
12450
12451 (defvar gnus-summary-generic-mark-map (make-sparse-keymap))
12452 (defvar gnus-summary-mark-map)
12453
12454 (defun gnus-summary-make-all-marking-commands ()
12455   (define-key gnus-summary-mark-map "M" gnus-summary-generic-mark-map)
12456   (dolist (elem gnus-summary-marking-alist)
12457     (apply 'gnus-summary-make-marking-command elem)))
12458
12459 (defun gnus-summary-make-marking-command (name mark keystroke)
12460   (let ((map (make-sparse-keymap)))
12461     (define-key gnus-summary-generic-mark-map keystroke map)
12462     (dolist (lway `((next "next" next nil "n")
12463                     (next-unread "next unread" next t "N")
12464                     (prev "previous" prev nil "p")
12465                     (prev-unread "previous unread" prev t "P")
12466                     (nomove "" nil nil ,keystroke)))
12467       (let ((func (gnus-summary-make-marking-command-1
12468                    mark (car lway) lway name)))
12469         (setq func (eval func))
12470         (define-key map (nth 4 lway) func)))))
12471
12472 (defun gnus-summary-make-marking-command-1 (mark way lway name)
12473   `(defun ,(intern
12474             (format "gnus-summary-put-mark-as-%s%s"
12475                     name (if (eq way 'nomove)
12476                              ""
12477                            (concat "-" (symbol-name way)))))
12478      (n)
12479      ,(format
12480        "Mark the current article as %s%s.
12481 If N, the prefix, then repeat N times.
12482 If N is negative, move in reverse order.
12483 The difference between N and the actual number of articles marked is
12484 returned."
12485        name (cadr lway))
12486      (interactive "p")
12487      (gnus-summary-generic-mark n ,mark ',(nth 2 lway) ,(nth 3 lway))))
12488
12489 (defun gnus-summary-generic-mark (n mark move unread)
12490   "Mark N articles with MARK."
12491   (unless (eq major-mode 'gnus-summary-mode)
12492     (error "This command can only be used in the summary buffer"))
12493   (gnus-summary-show-thread)
12494   (let ((nummove
12495          (cond
12496           ((eq move 'next) 1)
12497           ((eq move 'prev) -1)
12498           (t 0))))
12499     (if (zerop nummove)
12500         (setq n 1)
12501       (when (< n 0)
12502         (setq n (abs n)
12503               nummove (* -1 nummove))))
12504     (while (and (> n 0)
12505                 (gnus-summary-mark-article nil mark)
12506                 (zerop (gnus-summary-next-subject nummove unread t)))
12507       (setq n (1- n)))
12508     (when (/= 0 n)
12509       (gnus-message 7 "No more %sarticles" (if mark "" "unread ")))
12510     (gnus-summary-recenter)
12511     (gnus-summary-position-point)
12512     (gnus-set-mode-line 'summary)
12513     n))
12514
12515 (defun gnus-summary-insert-articles (articles)
12516   (when (setq articles
12517               (gnus-sorted-difference articles
12518                                       (mapcar (lambda (h)
12519                                                 (mail-header-number h))
12520                                               gnus-newsgroup-headers)))
12521     (setq gnus-newsgroup-headers
12522           (gnus-merge 'list
12523                       gnus-newsgroup-headers
12524                       (gnus-fetch-headers articles)
12525                       'gnus-article-sort-by-number))
12526     ;; Suppress duplicates?
12527     (when gnus-suppress-duplicates
12528       (gnus-dup-suppress-articles))
12529
12530     (if (and gnus-fetch-old-headers
12531              (eq gnus-headers-retrieved-by 'nov))
12532         ;; We might want to build some more threads first.
12533         (if (eq gnus-fetch-old-headers 'invisible)
12534             (gnus-build-all-threads)
12535           (gnus-build-old-threads))
12536       ;; Mark the inserted articles that are unread as unread.
12537       (setq gnus-newsgroup-unreads
12538             (gnus-sorted-nunion
12539              gnus-newsgroup-unreads
12540              (gnus-sorted-nintersection
12541               (gnus-list-of-unread-articles gnus-newsgroup-name)
12542               articles)))
12543       ;; Mark the inserted articles as selected so that the information
12544       ;; of the marks having been changed by a user may be updated when
12545       ;; exiting this group.  See `gnus-summary-update-info'.
12546       (dolist (art articles)
12547         (setq gnus-newsgroup-unselected (delq art gnus-newsgroup-unselected))))
12548     ;; Let the Gnus agent mark articles as read.
12549     (when gnus-agent
12550       (gnus-agent-get-undownloaded-list))
12551     ;; Remove list identifiers from subject
12552     (when gnus-list-identifiers
12553       (gnus-summary-remove-list-identifiers))
12554     ;; First and last article in this newsgroup.
12555     (when gnus-newsgroup-headers
12556       (setq gnus-newsgroup-begin
12557             (mail-header-number (car gnus-newsgroup-headers))
12558             gnus-newsgroup-end
12559             (mail-header-number
12560              (gnus-last-element gnus-newsgroup-headers))))
12561     (when gnus-use-scoring
12562       (gnus-possibly-score-headers))))
12563
12564 (defun gnus-summary-insert-old-articles (&optional all)
12565   "Insert all old articles in this group.
12566 If ALL is non-nil, already read articles become readable.
12567 If ALL is a number, fetch this number of articles."
12568   (interactive "P")
12569   (prog1
12570       (let ((old (sort (mapcar 'car gnus-newsgroup-data) '<))
12571             older len)
12572         (setq older
12573               ;; Some nntp servers lie about their active range.  When
12574               ;; this happens, the active range can be in the millions.
12575               ;; Use a compressed range to avoid creating a huge list.
12576               (gnus-range-difference (list gnus-newsgroup-active) old))
12577         (setq len (gnus-range-length older))
12578         (cond
12579          ((null older) nil)
12580          ((numberp all)
12581           (if (< all len)
12582               (let ((older-range (nreverse older)))
12583                 (setq older nil)
12584
12585                 (while (> all 0)
12586                   (let* ((r (pop older-range))
12587                          (min (if (numberp r) r (car r)))
12588                          (max (if (numberp r) r (cdr r))))
12589                     (while (and (<= min max)
12590                                 (> all 0))
12591                       (push max older)
12592                       (setq all (1- all)
12593                             max (1- max))))))
12594             (setq older (gnus-uncompress-range older))))
12595          (all
12596           (setq older (gnus-uncompress-range older)))
12597          (t
12598           (when (and (numberp gnus-large-newsgroup)
12599                    (> len gnus-large-newsgroup))
12600               (let* ((cursor-in-echo-area nil)
12601                      (initial (gnus-parameter-large-newsgroup-initial
12602                                gnus-newsgroup-name))
12603                      (input
12604                       (read-string
12605                        (format
12606                         "How many articles from %s (%s %d): "
12607                         (gnus-group-decoded-name gnus-newsgroup-name)
12608                         (if initial "max" "default")
12609                         len)
12610                        (if initial
12611                            (cons (number-to-string initial)
12612                                  0)))))
12613                 (unless (string-match "^[ \t]*$" input)
12614                   (setq all (string-to-number input))
12615                   (if (< all len)
12616                       (let ((older-range (nreverse older)))
12617                         (setq older nil)
12618
12619                         (while (> all 0)
12620                           (let* ((r (pop older-range))
12621                                  (min (if (numberp r) r (car r)))
12622                                  (max (if (numberp r) r (cdr r))))
12623                             (while (and (<= min max)
12624                                         (> all 0))
12625                               (push max older)
12626                               (setq all (1- all)
12627                                     max (1- max))))))))))
12628           (setq older (gnus-uncompress-range older))))
12629         (if (not older)
12630             (message "No old news.")
12631           (gnus-summary-insert-articles older)
12632           (gnus-summary-limit (gnus-sorted-nunion old older))))
12633     (gnus-summary-position-point)))
12634
12635 (defun gnus-summary-insert-new-articles ()
12636   "Insert all new articles in this group."
12637   (interactive)
12638   (prog1
12639       (let ((old (sort (mapcar 'car gnus-newsgroup-data) '<))
12640             (old-high gnus-newsgroup-highest)
12641             (nnmail-fetched-sources (list t))
12642             i new)
12643         (setq gnus-newsgroup-active
12644               (gnus-copy-sequence
12645                (gnus-activate-group gnus-newsgroup-name 'scan)))
12646         (setq i (cdr gnus-newsgroup-active)
12647               gnus-newsgroup-highest i)
12648         (while (> i old-high)
12649           (push i new)
12650           (decf i))
12651         (if (not new)
12652             (message "No gnus is bad news")
12653           (gnus-summary-insert-articles new)
12654           (setq gnus-newsgroup-unreads
12655                 (gnus-sorted-nunion gnus-newsgroup-unreads new))
12656           (gnus-summary-limit (gnus-sorted-nunion old new))))
12657     (gnus-summary-position-point)))
12658
12659 ;;; Bookmark support for Gnus.
12660 (declare-function bookmark-make-record-default
12661                   "bookmark" (&optional no-file no-context posn))
12662 (declare-function bookmark-prop-get "bookmark" (bookmark prop))
12663 (declare-function bookmark-default-handler "bookmark" (bmk))
12664 (declare-function bookmark-get-bookmark-record "bookmark" (bmk))
12665 (defvar bookmark-yank-point)
12666 (defvar bookmark-current-buffer)
12667
12668 (defun gnus-summary-bookmark-make-record ()
12669   "Make a bookmark entry for a Gnus summary buffer."
12670   (let (pos buf)
12671     (unless (and (derived-mode-p 'gnus-summary-mode) gnus-article-current)
12672       (save-restriction              ; FIXME is it necessary to widen?
12673         (widen) (setq pos (point))) ; Set position in gnus-article buffer.
12674       (setq buf "art") ; We are recording bookmark from article buffer.
12675       (setq bookmark-yank-point (point))
12676       (setq bookmark-current-buffer (current-buffer))
12677       (gnus-article-show-summary))      ; Go back in summary buffer.
12678     ;; We are now recording bookmark from summary buffer.
12679     (unless buf (setq buf "sum"))
12680     (let* ((subject (elt (gnus-summary-article-header) 1))
12681            (grp     (car gnus-article-current))
12682            (art     (cdr gnus-article-current))
12683            (head    (gnus-summary-article-header art))
12684            (id      (mail-header-id head)))
12685       `(,subject
12686         ,@(condition-case nil
12687               (bookmark-make-record-default 'no-file 'no-context pos)
12688             (wrong-number-of-arguments
12689              (bookmark-make-record-default 'point-only)))
12690         (location . ,(format "Gnus-%s %s:%d:%s" buf grp art id))
12691         (group . ,grp) (article . ,art)
12692         (message-id . ,id) (handler . gnus-summary-bookmark-jump)))))
12693
12694 ;;;###autoload
12695 (defun gnus-summary-bookmark-jump (bookmark)
12696   "Handler function for record returned by `gnus-summary-bookmark-make-record'.
12697 BOOKMARK is a bookmark name or a bookmark record."
12698   (let ((group    (bookmark-prop-get bookmark 'group))
12699         (article  (bookmark-prop-get bookmark 'article))
12700         (id       (bookmark-prop-get bookmark 'message-id))
12701         (buf      (car (split-string (bookmark-prop-get bookmark 'location)))))
12702     (gnus-fetch-group group (list article))
12703     (gnus-summary-insert-cached-articles)
12704     (gnus-summary-goto-article id nil 'force)
12705     ;; FIXME we have to wait article buffer is ready (only large buffer)
12706     ;; Is there a better solution to know that?
12707     ;; If we don't wait `bookmark-default-handler' will have no chance
12708     ;; to set position. However there is no error, just wrong pos.
12709     (sit-for 1)
12710     (when (string= buf "Gnus-art")
12711       (other-window 1))
12712     (bookmark-default-handler
12713      `(""
12714        (buffer . ,(current-buffer))
12715        . ,(bookmark-get-bookmark-record bookmark)))))
12716
12717 (gnus-summary-make-all-marking-commands)
12718
12719 (gnus-ems-redefine)
12720
12721 (provide 'gnus-sum)
12722
12723 (run-hooks 'gnus-sum-load-hook)
12724
12725 ;; Local Variables:
12726 ;; coding: iso-8859-1
12727 ;; End:
12728
12729 ;;; gnus-sum.el ends here