lisp/gnus/gnus-sum.el

   1 ;;; gnus-sum.el --- summary mode commands for Gnus
   2
   3 ;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
   5
   6 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   7 ;; Keywords: news
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;;; Code:
  27
  28 ;; For Emacs < 22.2.
  29 (eval-and-compile
  30   (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
  31 (eval-when-compile
  32   (require 'cl))
  33 (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   :type 'boolean)
  84
  85 (defcustom gnus-fetch-old-headers nil
  86   "*Non-nil means that Gnus will try to build threads by grabbing old headers.
  87 If an unread article in the group refers to an older, already
  88 read (or just marked as read) article, the old article will not
  89 normally be displayed in the Summary buffer.  If this variable is
  90 t, Gnus will attempt to grab the headers to the old articles, and
  91 thereby build complete threads.  If it has the value `some', all
  92 old headers will be fetched but only enough headers to connect
  93 otherwise loose threads will be displayed.  This variable can
  94 also be a number.  In that case, no more than that number of old
  95 headers will be fetched.  If it has the value `invisible', all
  96 old headers will be fetched, but none will be displayed.
  97
  98 The server has to support NOV for any of this to work.
  99
 100 This feature can seriously impact performance it ignores all
 101 locally cached header entries.  Setting it to t for groups for a
 102 server that doesn't expire articles (such as news.gmane.org),
 103 leads to very slow summary generation."
 104   :group 'gnus-thread
 105   :type '(choice (const :tag "off" nil)
 106                  (const :tag "on" t)
 107                  (const some)
 108                  (const invisible)
 109                  number
 110                  (sexp :menu-tag "other" t)))
 111
 112 (defcustom gnus-refer-thread-limit 500
 113   "*The number of old headers to fetch when doing \\<gnus-summary-mode-map>\\[gnus-summary-refer-thread].
 114 If t, fetch all the available old headers."
 115   :group 'gnus-thread
 116   :type '(choice number
 117                  (sexp :menu-tag "other" t)))
 118
 119 (defcustom gnus-summary-make-false-root 'adopt
 120   "*nil means that Gnus won't gather loose threads.
 121 If the root of a thread has expired or been read in a previous
 122 session, the information necessary to build a complete thread has been
 123 lost.  Instead of having many small sub-threads from this original thread
 124 scattered all over the summary buffer, Gnus can gather them.
 125
 126 If non-nil, Gnus will try to gather all loose sub-threads from an
 127 original thread into one large thread.
 128
 129 If this variable is non-nil, it should be one of `none', `adopt',
 130 `dummy' or `empty'.
 131
 132 If this variable is `none', Gnus will not make a false root, but just
 133 present the sub-threads after another.
 134 If this variable is `dummy', Gnus will create a dummy root that will
 135 have all the sub-threads as children.
 136 If this variable is `adopt', Gnus will make one of the \"children\"
 137 the parent and mark all the step-children as such.
 138 If this variable is `empty', the \"children\" are printed with empty
 139 subject fields.  (Or rather, they will be printed with a string
 140 given by the `gnus-summary-same-subject' variable.)"
 141   :group 'gnus-thread
 142   :type '(choice (const :tag "off" nil)
 143                  (const none)
 144                  (const dummy)
 145                  (const adopt)
 146                  (const empty)))
 147
 148 (defcustom gnus-summary-make-false-root-always nil
 149   "Always make a false dummy root."
 150   :version "22.1"
 151   :group 'gnus-thread
 152   :type 'boolean)
 153
 154 (defcustom gnus-summary-gather-exclude-subject "^ *$\\|^(none)$"
 155   "*A regexp to match subjects to be excluded from loose thread gathering.
 156 As loose thread gathering is done on subjects only, that means that
 157 there can be many false gatherings performed.  By rooting out certain
 158 common subjects, gathering might become saner."
 159   :group 'gnus-thread
 160   :type 'regexp)
 161
 162 (defcustom gnus-summary-gather-subject-limit nil
 163   "*Maximum length of subject comparisons when gathering loose threads.
 164 Use nil to compare full subjects.  Setting this variable to a low
 165 number will help gather threads that have been corrupted by
 166 newsreaders chopping off subject lines, but it might also mean that
 167 unrelated articles that have subject that happen to begin with the
 168 same few characters will be incorrectly gathered.
 169
 170 If this variable is `fuzzy', Gnus will use a fuzzy algorithm when
 171 comparing subjects."
 172   :group 'gnus-thread
 173   :type '(choice (const :tag "off" nil)
 174                  (const fuzzy)
 175                  (sexp :menu-tag "on" t)))
 176
 177 (defcustom gnus-simplify-subject-functions nil
 178   "List of functions taking a string argument that simplify subjects.
 179 The functions are applied recursively.
 180
 181 Useful functions to put in this list include:
 182 `gnus-simplify-subject-re', `gnus-simplify-subject-fuzzy',
 183 `gnus-simplify-whitespace', and `gnus-simplify-all-whitespace'."
 184   :group 'gnus-thread
 185   :type '(repeat function))
 186
 187 (defcustom gnus-simplify-ignored-prefixes nil
 188   "*Remove matches for this regexp from subject lines when simplifying fuzzily."
 189   :group 'gnus-thread
 190   :type '(choice (const :tag "off" nil)
 191                  regexp))
 192
 193 (defcustom gnus-build-sparse-threads nil
 194   "*If non-nil, fill in the gaps in threads.
 195 If `some', only fill in the gaps that are needed to tie loose threads
 196 together.  If `more', fill in all leaf nodes that Gnus can find.  If
 197 non-nil and non-`some', fill in all gaps that Gnus manages to guess."
 198   :group 'gnus-thread
 199   :type '(choice (const :tag "off" nil)
 200                  (const some)
 201                  (const more)
 202                  (sexp :menu-tag "all" t)))
 203
 204 (defcustom gnus-summary-thread-gathering-function
 205   'gnus-gather-threads-by-subject
 206   "*Function used for gathering loose threads.
 207 There are two pre-defined functions: `gnus-gather-threads-by-subject',
 208 which only takes Subjects into consideration; and
 209 `gnus-gather-threads-by-references', which compared the References
 210 headers of the articles to find matches."
 211   :group 'gnus-thread
 212   :type '(radio (function-item gnus-gather-threads-by-subject)
 213                 (function-item gnus-gather-threads-by-references)
 214                 (function :tag "other")))
 215
 216 (defcustom gnus-summary-same-subject ""
 217   "*String indicating that the current article has the same subject as the previous.
 218 This variable will only be used if the value of
 219 `gnus-summary-make-false-root' is `empty'."
 220   :group 'gnus-summary-format
 221   :type 'string)
 222
 223 (defcustom gnus-summary-goto-unread t
 224   "*If t, many commands will go to the next unread article.
 225 This applies to marking commands as well as other commands that
 226 \"naturally\" select the next article, like, for instance, `SPC' at
 227 the end of an article.
 228
 229 If nil, the marking commands do NOT go to the next unread article
 230 \(they go to the next article instead).  If `never', commands that
 231 usually go to the next unread article, will go to the next article,
 232 whether it is read or not."
 233   :group 'gnus-summary-marks
 234   :link '(custom-manual "(gnus)Setting Marks")
 235   :type '(choice (const :tag "off" nil)
 236                  (const never)
 237                  (sexp :menu-tag "on" t)))
 238
 239 (defcustom gnus-summary-default-score 0
 240   "*Default article score level.
 241 All scores generated by the score files will be added to this score.
 242 If this variable is nil, scoring will be disabled."
 243   :group 'gnus-score-default
 244   :type '(choice (const :tag "disable")
 245                  integer))
 246
 247 (defcustom gnus-summary-default-high-score 0
 248   "*Default threshold for a high scored article.
 249 An article will be highlighted as high scored if its score is greater
 250 than this score."
 251   :version "22.1"
 252   :group 'gnus-score-default
 253   :type 'integer)
 254
 255 (defcustom gnus-summary-default-low-score 0
 256   "*Default threshold for a low scored article.
 257 An article will be highlighted as low scored if its score is smaller
 258 than this score."
 259   :version "22.1"
 260   :group 'gnus-score-default
 261   :type 'integer)
 262
 263 (defcustom gnus-summary-zcore-fuzz 0
 264   "*Fuzziness factor for the zcore in the summary buffer.
 265 Articles with scores closer than this to `gnus-summary-default-score'
 266 will not be marked."
 267   :group 'gnus-summary-format
 268   :type 'integer)
 269
 270 (defcustom gnus-simplify-subject-fuzzy-regexp nil
 271   "*Strings to be removed when doing fuzzy matches.
 272 This can either be a regular expression or list of regular expressions
 273 that will be removed from subject strings if fuzzy subject
 274 simplification is selected."
 275   :group 'gnus-thread
 276   :type '(repeat regexp))
 277
 278 (defcustom gnus-show-threads t
 279   "*If non-nil, display threads in summary mode."
 280   :group 'gnus-thread
 281   :type 'boolean)
 282
 283 (defcustom gnus-thread-hide-subtree nil
 284   "*If non-nil, hide all threads initially.
 285 This can be a predicate specifier which says which threads to hide.
 286 If threads are hidden, you have to run the command
 287 `gnus-summary-show-thread' by hand or select an article."
 288   :group 'gnus-thread
 289   :type '(radio (sexp :format "Non-nil\n"
 290                       :match (lambda (widget value)
 291                                (not (or (consp value) (functionp value))))
 292                       :value t)
 293                 (const nil)
 294                 (sexp :tag "Predicate specifier")))
 295
 296 (defcustom gnus-thread-hide-killed t
 297   "*If non-nil, hide killed threads automatically."
 298   :group 'gnus-thread
 299   :type 'boolean)
 300
 301 (defcustom gnus-thread-ignore-subject t
 302   "*If non-nil, which is the default, ignore subjects and do all threading based on the Reference header.
 303 If nil, articles that have different subjects from their parents will
 304 start separate threads."
 305   :group 'gnus-thread
 306   :type 'boolean)
 307
 308 (defcustom gnus-thread-operation-ignore-subject t
 309   "*If non-nil, subjects will be ignored when doing thread commands.
 310 This affects commands like `gnus-summary-kill-thread' and
 311 `gnus-summary-lower-thread'.
 312
 313 If this variable is nil, articles in the same thread with different
 314 subjects will not be included in the operation in question.  If this
 315 variable is `fuzzy', only articles that have subjects that are fuzzily
 316 equal will be included."
 317   :group 'gnus-thread
 318   :type '(choice (const :tag "off" nil)
 319                  (const fuzzy)
 320                  (sexp :tag "on" t)))
 321
 322 (defcustom gnus-thread-indent-level 4
 323   "*Number that says how much each sub-thread should be indented."
 324   :group 'gnus-thread
 325   :type 'integer)
 326
 327 (defcustom gnus-auto-extend-newsgroup t
 328   "*If non-nil, extend newsgroup forward and backward when requested."
 329   :group 'gnus-summary-choose
 330   :type 'boolean)
 331
 332 (defcustom gnus-auto-select-first t
 333   "If non-nil, select an article on group entry.
 334 An article is selected automatically when entering a group
 335 e.g. with \\<gnus-group-mode-map>\\[gnus-group-read-group], or via `gnus-summary-next-page' or
 336 `gnus-summary-catchup-and-goto-next-group'.
 337
 338 Which article is selected is controlled by the variable
 339 `gnus-auto-select-subject'.
 340
 341 If you want to prevent automatic selection of articles in some
 342 newsgroups, set the variable to nil in `gnus-select-group-hook'."
 343   ;; Commands include...
 344   ;; \\<gnus-group-mode-map>\\[gnus-group-read-group]
 345   ;; \\<gnus-summary-mode-map>\\[gnus-summary-next-page]
 346   ;; \\<gnus-summary-mode-map>\\[gnus-summary-catchup-and-goto-next-group]
 347   :group 'gnus-group-select
 348   :type '(choice (const :tag "none" nil)
 349                  (sexp :menu-tag "first" t)))
 350
 351 (defcustom gnus-auto-select-subject 'unread
 352   "*Says what subject to place under point when entering a group.
 353
 354 This variable can either be the symbols `first' (place point on the
 355 first subject), `unread' (place point on the subject line of the first
 356 unread article), `best' (place point on the subject line of the
 357 higest-scored article), `unseen' (place point on the subject line of
 358 the first unseen article), `unseen-or-unread' (place point on the subject
 359 line of the first unseen article or, if all article have been seen, on the
 360 subject line of the first unread article), or a function to be called to
 361 place point on some subject line."
 362   :version "22.1"
 363   :group 'gnus-group-select
 364   :type '(choice (const best)
 365                  (const unread)
 366                  (const first)
 367                  (const unseen)
 368                  (const unseen-or-unread)))
 369
 370 (defcustom gnus-auto-select-next t
 371   "*If non-nil, offer to go to the next group from the end of the previous.
 372 If the value is t and the next newsgroup is empty, Gnus will exit
 373 summary mode and go back to group mode.  If the value is neither nil
 374 nor t, Gnus will select the following unread newsgroup.  In
 375 particular, if the value is the symbol `quietly', the next unread
 376 newsgroup will be selected without any confirmation, and if it is
 377 `almost-quietly', the next group will be selected without any
 378 confirmation if you are located on the last article in the group.
 379 Finally, if this variable is `slightly-quietly', the `\\<gnus-summary-mode-map>\\[gnus-summary-catchup-and-goto-next-group]' command
 380 will go to the next group without confirmation."
 381   :group 'gnus-summary-maneuvering
 382   :type '(choice (const :tag "off" nil)
 383                  (const quietly)
 384                  (const almost-quietly)
 385                  (const slightly-quietly)
 386                  (sexp :menu-tag "on" t)))
 387
 388 (defcustom gnus-auto-select-same nil
 389   "*If non-nil, select the next article with the same subject.
 390 If there are no more articles with the same subject, go to
 391 the first unread article."
 392   :group 'gnus-summary-maneuvering
 393   :type 'boolean)
 394
 395 (defcustom gnus-auto-select-on-ephemeral-exit 'next-noselect
 396   "What article should be selected after exiting an ephemeral group.
 397 Valid values include:
 398
 399 `next'
 400   Select the next article.
 401 `next-unread'
 402   Select the next unread article.
 403 `next-noselect'
 404   Move the cursor to the next article.  This is the default.
 405 `next-unread-noselect'
 406   Move the cursor to the next unread article.
 407
 408 If it has any other value or there is no next (unread) article, the
 409 article selected before entering to the ephemeral group will appear."
 410   :version "23.1" ;; No Gnus
 411   :group 'gnus-summary-maneuvering
 412   :type '(choice :format "%{%t%}:\n %[Value Menu%] %v"
 413                  (const next) (const next-unread)
 414                  (const next-noselect) (const next-unread-noselect)
 415                  (sexp :tag "other" :value nil)))
 416
 417 (defcustom gnus-auto-goto-ignores 'unfetched
 418   "*Says how to handle unfetched articles when maneuvering.
 419
 420 This variable can either be the symbols nil (maneuver to any
 421 article), `undownloaded' (maneuvering while unplugged ignores articles
 422 that have not been fetched), `always-undownloaded' (maneuvering always
 423 ignores articles that have not been fetched), `unfetched' (maneuvering
 424 ignores articles whose headers have not been fetched).
 425
 426 NOTE: The list of unfetched articles will always be nil when plugged
 427 and, when unplugged, a subset of the undownloaded article list."
 428   :version "22.1"
 429   :group 'gnus-summary-maneuvering
 430   :type '(choice (const :tag "None" nil)
 431                  (const :tag "Undownloaded when unplugged" undownloaded)
 432                  (const :tag "Undownloaded" always-undownloaded)
 433                  (const :tag "Unfetched" unfetched)))
 434
 435 (defcustom gnus-summary-check-current nil
 436   "*If non-nil, consider the current article when moving.
 437 The \"unread\" movement commands will stay on the same line if the
 438 current article is unread."
 439   :group 'gnus-summary-maneuvering
 440   :type 'boolean)
 441
 442 (defcustom gnus-auto-center-summary 2
 443   "*If non-nil, always center the current summary buffer.
 444 In particular, if `vertical' do only vertical recentering.  If non-nil
 445 and non-`vertical', do both horizontal and vertical recentering."
 446   :group 'gnus-summary-maneuvering
 447   :type '(choice (const :tag "none" nil)
 448                  (const vertical)
 449                  (integer :tag "height")
 450                  (sexp :menu-tag "both" t)))
 451
 452 (defvar gnus-auto-center-group t
 453   "*If non-nil, always center the group buffer.")
 454
 455 (defcustom gnus-show-all-headers nil
 456   "*If non-nil, don't hide any headers."
 457   :group 'gnus-article-hiding
 458   :group 'gnus-article-headers
 459   :type 'boolean)
 460
 461 (defcustom gnus-summary-ignore-duplicates nil
 462   "*If non-nil, ignore articles with identical Message-ID headers."
 463   :group 'gnus-summary
 464   :type 'boolean)
 465
 466 (defcustom gnus-single-article-buffer t
 467   "*If non-nil, display all articles in the same buffer.
 468 If nil, each group will get its own article buffer."
 469   :group 'gnus-article-various
 470   :type 'boolean)
 471
 472 (defcustom gnus-break-pages t
 473   "*If non-nil, do page breaking on articles.
 474 The page delimiter is specified by the `gnus-page-delimiter'
 475 variable."
 476   :group 'gnus-article-various
 477   :type 'boolean)
 478
 479 (defcustom gnus-move-split-methods nil
 480   "*Variable used to suggest where articles are to be moved to.
 481 It uses the same syntax as the `gnus-split-methods' variable.
 482 However, whereas `gnus-split-methods' specifies file names as targets,
 483 this variable specifies group names."
 484   :group 'gnus-summary-mail
 485   :type '(repeat (choice (list :value (fun) function)
 486                          (cons :value ("" "") regexp (repeat string))
 487                          (sexp :value nil))))
 488
 489 (defcustom gnus-move-group-prefix-function 'gnus-group-real-prefix
 490   "Function used to compute default prefix for article move/copy/etc prompts.
 491 The function should take one argument, a group name, and return a
 492 string with the suggested prefix."
 493   :group 'gnus-summary-mail
 494   :type 'function)
 495
 496 ;; FIXME: Although the custom type is `character' for the following variables,
 497 ;; using multibyte characters (Latin-1, UTF-8) doesn't work.  -- rs
 498
 499 (defcustom gnus-unread-mark ?           ;Whitespace
 500   "*Mark used for unread articles."
 501   :group 'gnus-summary-marks
 502   :type 'character)
 503
 504 (defcustom gnus-ticked-mark ?!
 505   "*Mark used for ticked articles."
 506   :group 'gnus-summary-marks
 507   :type 'character)
 508
 509 (defcustom gnus-dormant-mark ??
 510   "*Mark used for dormant articles."
 511   :group 'gnus-summary-marks
 512   :type 'character)
 513
 514 (defcustom gnus-del-mark ?r
 515   "*Mark used for del'd articles."
 516   :group 'gnus-summary-marks
 517   :type 'character)
 518
 519 (defcustom gnus-read-mark ?R
 520   "*Mark used for read articles."
 521   :group 'gnus-summary-marks
 522   :type 'character)
 523
 524 (defcustom gnus-expirable-mark ?E
 525   "*Mark used for expirable articles."
 526   :group 'gnus-summary-marks
 527   :type 'character)
 528
 529 (defcustom gnus-killed-mark ?K
 530   "*Mark used for killed articles."
 531   :group 'gnus-summary-marks
 532   :type 'character)
 533
 534 (defcustom gnus-spam-mark ?$
 535   "*Mark used for spam articles."
 536   :version "22.1"
 537   :group 'gnus-summary-marks
 538   :type 'character)
 539
 540 (defcustom gnus-souped-mark ?F
 541   "*Mark used for souped articles."
 542   :group 'gnus-summary-marks
 543   :type 'character)
 544
 545 (defcustom gnus-kill-file-mark ?X
 546   "*Mark used for articles killed by kill files."
 547   :group 'gnus-summary-marks
 548   :type 'character)
 549
 550 (defcustom gnus-low-score-mark ?Y
 551   "*Mark used for articles with a low score."
 552   :group 'gnus-summary-marks
 553   :type 'character)
 554
 555 (defcustom gnus-catchup-mark ?C
 556   "*Mark used for articles that are caught up."
 557   :group 'gnus-summary-marks
 558   :type 'character)
 559
 560 (defcustom gnus-replied-mark ?A
 561   "*Mark used for articles that have been replied to."
 562   :group 'gnus-summary-marks
 563   :type 'character)
 564
 565 (defcustom gnus-forwarded-mark ?F
 566   "*Mark used for articles that have been forwarded."
 567   :version "22.1"
 568   :group 'gnus-summary-marks
 569   :type 'character)
 570
 571 (defcustom gnus-recent-mark ?N
 572   "*Mark used for articles that are recent."
 573   :version "22.1"
 574   :group 'gnus-summary-marks
 575   :type 'character)
 576
 577 (defcustom gnus-cached-mark ?*
 578   "*Mark used for articles that are in the cache."
 579   :group 'gnus-summary-marks
 580   :type 'character)
 581
 582 (defcustom gnus-saved-mark ?S
 583   "*Mark used for articles that have been saved."
 584   :group 'gnus-summary-marks
 585   :type 'character)
 586
 587 (defcustom gnus-unseen-mark ?.
 588   "*Mark used for articles that haven't been seen."
 589   :version "22.1"
 590   :group 'gnus-summary-marks
 591   :type 'character)
 592
 593 (defcustom gnus-no-mark ?               ;Whitespace
 594   "*Mark used for articles that have no other secondary mark."
 595   :version "22.1"
 596   :group 'gnus-summary-marks
 597   :type 'character)
 598
 599 (defcustom gnus-ancient-mark ?O
 600   "*Mark used for ancient articles."
 601   :group 'gnus-summary-marks
 602   :type 'character)
 603
 604 (defcustom gnus-sparse-mark ?Q
 605   "*Mark used for sparsely reffed articles."
 606   :group 'gnus-summary-marks
 607   :type 'character)
 608
 609 (defcustom gnus-canceled-mark ?G
 610   "*Mark used for canceled articles."
 611   :group 'gnus-summary-marks
 612   :type 'character)
 613
 614 (defcustom gnus-duplicate-mark ?M
 615   "*Mark used for duplicate articles."
 616   :group 'gnus-summary-marks
 617   :type 'character)
 618
 619 (defcustom gnus-undownloaded-mark ?-
 620   "*Mark used for articles that weren't downloaded."
 621   :version "22.1"
 622   :group 'gnus-summary-marks
 623   :type 'character)
 624
 625 (defcustom gnus-downloaded-mark ?+
 626   "*Mark used for articles that were downloaded."
 627   :group 'gnus-summary-marks
 628   :type 'character)
 629
 630 (defcustom gnus-downloadable-mark ?%
 631   "*Mark used for articles that are to be downloaded."
 632   :group 'gnus-summary-marks
 633   :type 'character)
 634
 635 (defcustom gnus-unsendable-mark ?=
 636   "*Mark used for articles that won't be sent."
 637   :group 'gnus-summary-marks
 638   :type 'character)
 639
 640 (defcustom gnus-score-over-mark ?+
 641   "*Score mark used for articles with high scores."
 642   :group 'gnus-summary-marks
 643   :type 'character)
 644
 645 (defcustom gnus-score-below-mark ?-
 646   "*Score mark used for articles with low scores."
 647   :group 'gnus-summary-marks
 648   :type 'character)
 649
 650 (defcustom gnus-empty-thread-mark ?     ;Whitespace
 651   "*There is no thread under the article."
 652   :group 'gnus-summary-marks
 653   :type 'character)
 654
 655 (defcustom gnus-not-empty-thread-mark ?=
 656   "*There is a thread under the article."
 657   :group 'gnus-summary-marks
 658   :type 'character)
 659
 660 (defcustom gnus-view-pseudo-asynchronously nil
 661   "*If non-nil, Gnus will view pseudo-articles asynchronously."
 662   :group 'gnus-extract-view
 663   :type 'boolean)
 664
 665 (defcustom gnus-auto-expirable-marks
 666   (list gnus-killed-mark gnus-del-mark gnus-catchup-mark
 667         gnus-low-score-mark gnus-ancient-mark gnus-read-mark
 668         gnus-souped-mark gnus-duplicate-mark)
 669   "*The list of marks converted into expiration if a group is auto-expirable."
 670   :version "21.1"
 671   :group 'gnus-summary
 672   :type '(repeat character))
 673
 674 (defcustom gnus-inhibit-user-auto-expire t
 675   "*If non-nil, user marking commands will not mark an article as expirable, even if the group has auto-expire turned on."
 676   :version "21.1"
 677   :group 'gnus-summary
 678   :type 'boolean)
 679
 680 (defcustom gnus-mark-copied-or-moved-articles-as-expirable nil
 681   "If non-nil, mark articles copied or moved to auto-expire group as expirable.
 682 If nil, the expirable marks will be unchanged except that the marks
 683 will be removed when copying or moving articles to a group that has
 684 not turned auto-expire on.  If non-nil, articles that have been read
 685 will be marked as expirable when being copied or moved to a group in
 686 which auto-expire is turned on."
 687   :version "23.2"
 688   :type 'boolean
 689   :group 'gnus-summary-marks)
 690
 691 (defcustom gnus-view-pseudos nil
 692   "*If `automatic', pseudo-articles will be viewed automatically.
 693 If `not-confirm', pseudos will be viewed automatically, and the user
 694 will not be asked to confirm the command."
 695   :group 'gnus-extract-view
 696   :type '(choice (const :tag "off" nil)
 697                  (const automatic)
 698                  (const not-confirm)))
 699
 700 (defcustom gnus-view-pseudos-separately t
 701   "*If non-nil, one pseudo-article will be created for each file to be viewed.
 702 If nil, all files that use the same viewing command will be given as a
 703 list of parameters to that command."
 704   :group 'gnus-extract-view
 705   :type 'boolean)
 706
 707 (defcustom gnus-insert-pseudo-articles t
 708   "*If non-nil, insert pseudo-articles when decoding articles."
 709   :group 'gnus-extract-view
 710   :type 'boolean)
 711
 712 (defcustom gnus-summary-dummy-line-format
 713   "   %(:                             :%) %S\n"
 714   "*The format specification for the dummy roots in the summary buffer.
 715 It works along the same lines as a normal formatting string,
 716 with some simple extensions.
 717
 718 %S  The subject
 719
 720 General format specifiers can also be used.
 721 See `(gnus)Formatting Variables'."
 722   :link '(custom-manual "(gnus)Formatting Variables")
 723   :group 'gnus-threading
 724   :type 'string)
 725
 726 (defcustom gnus-summary-mode-line-format "Gnus: %g [%A] %Z"
 727   "*The format specification for the summary mode line.
 728 It works along the same lines as a normal formatting string,
 729 with some simple extensions:
 730
 731 %G  Group name
 732 %p  Unprefixed group name
 733 %A  Current article number
 734 %z  Current article score
 735 %V  Gnus version
 736 %U  Number of unread articles in the group
 737 %e  Number of unselected articles in the group
 738 %Z  A string with unread/unselected article counts
 739 %g  Shortish group name
 740 %S  Subject of the current article
 741 %u  User-defined spec
 742 %s  Current score file name
 743 %d  Number of dormant articles
 744 %r  Number of articles that have been marked as read in this session
 745 %E  Number of articles expunged by the score files"
 746   :group 'gnus-summary-format
 747   :type 'string)
 748
 749 (defcustom gnus-list-identifiers nil
 750   "Regexp that matches list identifiers to be removed from subject.
 751 This can also be a list of regexps."
 752   :version "21.1"
 753   :group 'gnus-summary-format
 754   :group 'gnus-article-hiding
 755   :type '(choice (const :tag "none" nil)
 756                  (regexp :value ".*")
 757                  (repeat :value (".*") regexp)))
 758
 759 (defcustom gnus-summary-mark-below 0
 760   "*Mark all articles with a score below this variable as read.
 761 This variable is local to each summary buffer and usually set by the
 762 score file."
 763   :group 'gnus-score-default
 764   :type 'integer)
 765
 766 (defun gnus-widget-reversible-match (widget value)
 767   "Ignoring WIDGET, convert VALUE to internal form.
 768 VALUE should have the form `FOO' or `(not FOO)', where FOO is an symbol."
 769   ;; (debug value)
 770   (or (symbolp value)
 771       (and (listp value)
 772            (eq (length value) 2)
 773            (eq (nth 0 value) 'not)
 774            (symbolp (nth 1 value)))))
 775
 776 (defun gnus-widget-reversible-to-internal (widget value)
 777   "Ignoring WIDGET, convert VALUE to internal form.
 778 VALUE should have the form `FOO' or `(not FOO)', where FOO is an atom.
 779 FOO is converted to (FOO nil) and (not FOO) is converted to (FOO t)."
 780   ;; (debug value)
 781   (if (atom value)
 782       (list value nil)
 783     (list (nth 1 value) t)))
 784
 785 (defun gnus-widget-reversible-to-external (widget value)
 786   "Ignoring WIDGET, convert VALUE to external form.
 787 VALUE should have the form `(FOO nil)' or `(FOO t)', where FOO is an atom.
 788 \(FOO  nil) is converted to FOO and (FOO t) is converted to (not FOO)."
 789   ;; (debug value)
 790   (if (nth 1 value)
 791       (list 'not (nth 0 value))
 792     (nth 0 value)))
 793
 794 (define-widget 'gnus-widget-reversible 'group
 795   "A `group' that convert values."
 796   :match 'gnus-widget-reversible-match
 797   :value-to-internal 'gnus-widget-reversible-to-internal
 798   :value-to-external 'gnus-widget-reversible-to-external)
 799
 800 (defcustom gnus-article-sort-functions '(gnus-article-sort-by-number)
 801   "*List of functions used for sorting articles in the summary buffer.
 802
 803 Each function takes two articles and returns non-nil if the first
 804 article should be sorted before the other.  If you use more than one
 805 function, the primary sort function should be the last.  You should
 806 probably always include `gnus-article-sort-by-number' in the list of
 807 sorting functions -- preferably first.  Also note that sorting by date
 808 is often much slower than sorting by number, and the sorting order is
 809 very similar.  (Sorting by date means sorting by the time the message
 810 was sent, sorting by number means sorting by arrival time.)
 811
 812 Each item can also be a list `(not F)' where F is a function;
 813 this reverses the sort order.
 814
 815 Ready-made functions include `gnus-article-sort-by-number',
 816 `gnus-article-sort-by-author', `gnus-article-sort-by-subject',
 817 `gnus-article-sort-by-date', `gnus-article-sort-by-random'
 818 and `gnus-article-sort-by-score'.
 819
 820 When threading is turned on, the variable `gnus-thread-sort-functions'
 821 controls how articles are sorted."
 822   :group 'gnus-summary-sort
 823   :type '(repeat (gnus-widget-reversible
 824                   (choice (function-item gnus-article-sort-by-number)
 825                           (function-item gnus-article-sort-by-author)
 826                           (function-item gnus-article-sort-by-subject)
 827                           (function-item gnus-article-sort-by-date)
 828                           (function-item gnus-article-sort-by-score)
 829                           (function-item gnus-article-sort-by-random)
 830                           (function :tag "other"))
 831                   (boolean :tag "Reverse order"))))
 832
 833
 834 (defcustom gnus-thread-sort-functions '(gnus-thread-sort-by-number)
 835   "*List of functions used for sorting threads in the summary buffer.
 836 By default, threads are sorted by article number.
 837
 838 Each function takes two threads and returns non-nil if the first
 839 thread should be sorted before the other.  If you use more than one
 840 function, the primary sort function should be the last.  You should
 841 probably always include `gnus-thread-sort-by-number' in the list of
 842 sorting functions -- preferably first.  Also note that sorting by date
 843 is often much slower than sorting by number, and the sorting order is
 844 very similar.  (Sorting by date means sorting by the time the message
 845 was sent, sorting by number means sorting by arrival time.)
 846
 847 Each list item can also be a list `(not F)' where F is a
 848 function; this specifies reversed sort order.
 849
 850 Ready-made functions include `gnus-thread-sort-by-number',
 851 `gnus-thread-sort-by-author', `gnus-thread-sort-by-recipient'
 852 `gnus-thread-sort-by-subject', `gnus-thread-sort-by-date',
 853 `gnus-thread-sort-by-score', `gnus-thread-sort-by-most-recent-number',
 854 `gnus-thread-sort-by-most-recent-date', `gnus-thread-sort-by-random',
 855 and `gnus-thread-sort-by-total-score' (see
 856 `gnus-thread-score-function').
 857
 858 When threading is turned off, the variable
 859 `gnus-article-sort-functions' controls how articles are sorted."
 860   :group 'gnus-summary-sort
 861   :type '(repeat
 862           (gnus-widget-reversible
 863            (choice (function-item gnus-thread-sort-by-number)
 864                    (function-item gnus-thread-sort-by-author)
 865                    (function-item gnus-thread-sort-by-recipient)
 866                    (function-item gnus-thread-sort-by-subject)
 867                    (function-item gnus-thread-sort-by-date)
 868                    (function-item gnus-thread-sort-by-score)
 869                    (function-item gnus-thread-sort-by-most-recent-number)
 870                    (function-item gnus-thread-sort-by-most-recent-date)
 871                    (function-item gnus-thread-sort-by-random)
 872                    (function-item gnus-thread-sort-by-total-score)
 873                    (function :tag "other"))
 874            (boolean :tag "Reverse order"))))
 875
 876 (defcustom gnus-thread-score-function '+
 877   "*Function used for calculating the total score of a thread.
 878
 879 The function is called with the scores of the article and each
 880 subthread and should then return the score of the thread.
 881
 882 Some functions you can use are `+', `max', or `min'."
 883   :group 'gnus-summary-sort
 884   :type 'function)
 885
 886 (defcustom gnus-summary-expunge-below nil
 887   "All articles that have a score less than this variable will be expunged.
 888 This variable is local to the summary buffers."
 889   :group 'gnus-score-default
 890   :type '(choice (const :tag "off" nil)
 891                  integer))
 892
 893 (defcustom gnus-thread-expunge-below nil
 894   "All threads that have a total score less than this variable will be expunged.
 895 See `gnus-thread-score-function' for en explanation of what a
 896 \"thread score\" is.
 897
 898 This variable is local to the summary buffers."
 899   :group 'gnus-threading
 900   :group 'gnus-score-default
 901   :type '(choice (const :tag "off" nil)
 902                  integer))
 903
 904 (defcustom gnus-summary-mode-hook nil
 905   "*A hook for Gnus summary mode.
 906 This hook is run before any variables are set in the summary buffer."
 907   :options '(turn-on-gnus-mailing-list-mode gnus-pick-mode)
 908   :group 'gnus-summary-various
 909   :type 'hook)
 910
 911 ;; Extracted from gnus-xmas-redefine in order to preserve user settings
 912 (when (featurep 'xemacs)
 913   (add-hook 'gnus-summary-mode-hook 'gnus-xmas-summary-menu-add)
 914   (add-hook 'gnus-summary-mode-hook 'gnus-xmas-setup-summary-toolbar)
 915   (add-hook 'gnus-summary-mode-hook
 916             'gnus-xmas-switch-horizontal-scrollbar-off))
 917
 918 (defcustom gnus-summary-menu-hook nil
 919   "*Hook run after the creation of the summary mode menu."
 920   :group 'gnus-summary-visual
 921   :type 'hook)
 922
 923 (defcustom gnus-summary-exit-hook nil
 924   "*A hook called on exit from the summary buffer.
 925 It will be called with point in the group buffer."
 926   :group 'gnus-summary-exit
 927   :type 'hook)
 928
 929 (defcustom gnus-summary-prepare-hook nil
 930   "*A hook called after the summary buffer has been generated.
 931 If you want to modify the summary buffer, you can use this hook."
 932   :group 'gnus-summary-various
 933   :type 'hook)
 934
 935 (defcustom gnus-summary-prepared-hook nil
 936   "*A hook called as the last thing after the summary buffer has been generated."
 937   :group 'gnus-summary-various
 938   :type 'hook)
 939
 940 (defcustom gnus-summary-generate-hook nil
 941   "*A hook run just before generating the summary buffer.
 942 This hook is commonly used to customize threading variables and the
 943 like."
 944   :group 'gnus-summary-various
 945   :type 'hook)
 946
 947 (defcustom gnus-select-group-hook nil
 948   "*A hook called when a newsgroup is selected.
 949
 950 If you'd like to simplify subjects like the
 951 `gnus-summary-next-same-subject' command does, you can use the
 952 following hook:
 953
 954  (add-hook gnus-select-group-hook
 955            (lambda ()
 956              (mapcar (lambda (header)
 957                        (mail-header-set-subject
 958                         header
 959                         (gnus-simplify-subject
 960                          (mail-header-subject header) 're-only)))
 961                      gnus-newsgroup-headers)))"
 962   :group 'gnus-group-select
 963   :type 'hook)
 964
 965 (defcustom gnus-select-article-hook nil
 966   "*A hook called when an article is selected."
 967   :group 'gnus-summary-choose
 968   :options '(gnus-agent-fetch-selected-article)
 969   :type 'hook)
 970
 971 (defcustom gnus-visual-mark-article-hook
 972   (list 'gnus-highlight-selected-summary)
 973   "*Hook run after selecting an article in the summary buffer.
 974 It is meant to be used for highlighting the article in some way.  It
 975 is not run if `gnus-visual' is nil."
 976   :group 'gnus-summary-visual
 977   :type 'hook)
 978
 979 (defcustom gnus-parse-headers-hook nil
 980   "*A hook called before parsing the headers."
 981   :group 'gnus-various
 982   :type 'hook)
 983
 984 (defcustom gnus-exit-group-hook nil
 985   "*A hook called when exiting summary mode.
 986 This hook is not called from the non-updating exit commands like `Q'."
 987   :group 'gnus-various
 988   :type 'hook)
 989
 990 (defcustom gnus-summary-update-hook
 991   (list 'gnus-summary-highlight-line)
 992   "*A hook called when a summary line is changed.
 993 The hook will not be called if `gnus-visual' is nil.
 994
 995 The default function `gnus-summary-highlight-line' will
 996 highlight the line according to the `gnus-summary-highlight'
 997 variable."
 998   :group 'gnus-summary-visual
 999   :type 'hook)
1000
1001 (defcustom gnus-mark-article-hook '(gnus-summary-mark-read-and-unread-as-read)
1002   "*A hook called when an article is selected for the first time.
1003 The hook is intended to mark an article as read (or unread)
1004 automatically when it is selected."
1005   :group 'gnus-summary-choose
1006   :type 'hook)
1007
1008 (defcustom gnus-group-no-more-groups-hook nil
1009   "*A hook run when returning to group mode having no more (unread) groups."
1010   :group 'gnus-group-select
1011   :type 'hook)
1012
1013 (defcustom gnus-ps-print-hook nil
1014   "*A hook run before ps-printing something from Gnus."
1015   :group 'gnus-summary
1016   :type 'hook)
1017
1018 (defcustom gnus-summary-article-move-hook nil
1019   "*A hook called after an article is moved, copied, respooled, or crossposted."
1020   :version "22.1"
1021   :group 'gnus-summary
1022   :type 'hook)
1023
1024 (defcustom gnus-summary-article-delete-hook nil
1025   "*A hook called after an article is deleted."
1026   :version "22.1"
1027   :group 'gnus-summary
1028   :type 'hook)
1029
1030 (defcustom gnus-summary-article-expire-hook nil
1031   "*A hook called after an article is expired."
1032   :version "22.1"
1033   :group 'gnus-summary
1034   :type 'hook)
1035
1036 (defcustom gnus-summary-display-arrow
1037   (and (fboundp 'display-graphic-p)
1038        (display-graphic-p))
1039   "*If non-nil, display an arrow highlighting the current article."
1040   :version "22.1"
1041   :group 'gnus-summary
1042   :type 'boolean)
1043
1044 (defcustom gnus-summary-selected-face 'gnus-summary-selected
1045   "Face used for highlighting the current article in the summary buffer."
1046   :group 'gnus-summary-visual
1047   :type 'face)
1048
1049 (defvar gnus-tmp-downloaded nil)
1050
1051 (defcustom gnus-summary-highlight
1052   '(((eq mark gnus-canceled-mark)
1053      . gnus-summary-cancelled)
1054     ((and uncached (> score default-high))
1055      . gnus-summary-high-undownloaded)
1056     ((and uncached (< score default-low))
1057      . gnus-summary-low-undownloaded)
1058     (uncached
1059      . gnus-summary-normal-undownloaded)
1060     ((and (> score default-high)
1061           (or (eq mark gnus-dormant-mark)
1062               (eq mark gnus-ticked-mark)))
1063      . gnus-summary-high-ticked)
1064     ((and (< score default-low)
1065           (or (eq mark gnus-dormant-mark)
1066               (eq mark gnus-ticked-mark)))
1067      . gnus-summary-low-ticked)
1068     ((or (eq mark gnus-dormant-mark)
1069          (eq mark gnus-ticked-mark))
1070      . gnus-summary-normal-ticked)
1071     ((and (> score default-high) (eq mark gnus-ancient-mark))
1072      . gnus-summary-high-ancient)
1073     ((and (< score default-low) (eq mark gnus-ancient-mark))
1074      . gnus-summary-low-ancient)
1075     ((eq mark gnus-ancient-mark)
1076      . gnus-summary-normal-ancient)
1077     ((and (> score default-high) (eq mark gnus-unread-mark))
1078      . gnus-summary-high-unread)
1079     ((and (< score default-low) (eq mark gnus-unread-mark))
1080      . gnus-summary-low-unread)
1081     ((eq mark gnus-unread-mark)
1082      . gnus-summary-normal-unread)
1083     ((> score default-high)
1084      . gnus-summary-high-read)
1085     ((< score default-low)
1086      . gnus-summary-low-read)
1087     (t
1088      . gnus-summary-normal-read))
1089   "*Controls the highlighting of summary buffer lines.
1090
1091 A list of (FORM . FACE) pairs.  When deciding how a particular
1092 summary line should be displayed, each form is evaluated.  The content
1093 of the face field after the first true form is used.  You can change
1094 how those summary lines are displayed, by editing the face field.
1095
1096 You can use the following variables in the FORM field.
1097
1098 score:        The article's score.
1099 default:      The default article score.
1100 default-high: The default score for high scored articles.
1101 default-low:  The default score for low scored articles.
1102 below:        The score below which articles are automatically marked as read.
1103 mark:         The article's mark.
1104 uncached:     Non-nil if the article is uncached."
1105   :group 'gnus-summary-visual
1106   :type '(repeat (cons (sexp :tag "Form" nil)
1107                        face)))
1108 (put 'gnus-summary-highlight 'risky-local-variable t)
1109
1110 (defcustom gnus-alter-header-function nil
1111   "Function called to allow alteration of article header structures.
1112 The function is called with one parameter, the article header vector,
1113 which it may alter in any way."
1114   :type '(choice (const :tag "None" nil)
1115                  function)
1116   :group 'gnus-summary)
1117
1118 (defvar gnus-decode-encoded-word-function 'mail-decode-encoded-word-string
1119   "Function used to decode a string with encoded words.")
1120
1121 (defvar gnus-decode-encoded-address-function
1122   'mail-decode-encoded-address-string
1123   "Function used to decode addresses with encoded words.")
1124
1125 (defcustom gnus-extra-headers '(To Newsgroups)
1126   "*Extra headers to parse."
1127   :version "21.1"
1128   :group 'gnus-summary
1129   :type '(repeat symbol))
1130
1131 (defcustom gnus-ignored-from-addresses
1132   (and user-mail-address
1133        (not (string= user-mail-address ""))
1134        (regexp-quote user-mail-address))
1135   "*From headers that may be suppressed in favor of To headers.
1136 This can be a regexp or a list of regexps."
1137   :version "21.1"
1138   :group 'gnus-summary
1139   :type '(choice regexp
1140                  (repeat :tag "Regexp List" regexp)))
1141
1142 (defsubst gnus-ignored-from-addresses ()
1143   (gmm-regexp-concat gnus-ignored-from-addresses))
1144
1145 (defcustom gnus-summary-to-prefix "-> "
1146   "*String prefixed to the To field in the summary line when
1147 using `gnus-ignored-from-addresses'."
1148   :version "22.1"
1149   :group 'gnus-summary
1150   :type 'string)
1151
1152 (defcustom gnus-summary-newsgroup-prefix "=> "
1153   "*String prefixed to the Newsgroup field in the summary
1154 line when using `gnus-ignored-from-addresses'."
1155   :version "22.1"
1156   :group 'gnus-summary
1157   :type 'string)
1158
1159 (defcustom gnus-newsgroup-ignored-charsets '(unknown-8bit x-unknown)
1160   "List of charsets that should be ignored.
1161 When these charsets are used in the \"charset\" parameter, the
1162 default charset will be used instead."
1163   :version "21.1"
1164   :type '(repeat symbol)
1165   :group 'gnus-charset)
1166
1167 (defcustom gnus-newsgroup-maximum-articles nil
1168   "The maximum number of articles a newsgroup.
1169 If this is a number, old articles in a newsgroup exceeding this number
1170 are silently ignored.  If it is nil, no article is ignored.  Note that
1171 setting this variable to a number might prevent you from reading very
1172 old articles."
1173   :group 'gnus-group-select
1174   :version "22.2"
1175   :type '(choice (const :tag "No limit" nil)
1176                  integer))
1177
1178 (gnus-define-group-parameter
1179  ignored-charsets
1180  :type list
1181  :function-document
1182  "Return the ignored charsets of GROUP."
1183  :variable gnus-group-ignored-charsets-alist
1184  :variable-default
1185  '(("alt\\.chinese\\.text" iso-8859-1))
1186  :variable-document
1187  "Alist of regexps (to match group names) and charsets that should be ignored.
1188 When these charsets are used in the \"charset\" parameter, the
1189 default charset will be used instead."
1190  :variable-group gnus-charset
1191  :variable-type '(repeat (cons (regexp :tag "Group")
1192                                (repeat symbol)))
1193  :parameter-type '(choice :tag "Ignored charsets"
1194                           :value nil
1195                           (repeat (symbol)))
1196  :parameter-document       "\
1197 List of charsets that should be ignored.
1198
1199 When these charsets are used in the \"charset\" parameter, the
1200 default charset will be used instead.")
1201
1202 (defcustom gnus-group-highlight-words-alist nil
1203   "Alist of group regexps and highlight regexps.
1204 This variable uses the same syntax as `gnus-emphasis-alist'."
1205   :version "21.1"
1206   :type '(repeat (cons (regexp :tag "Group")
1207                        (repeat (list (regexp :tag "Highlight regexp")
1208                                      (number :tag "Group for entire word" 0)
1209                                      (number :tag "Group for displayed part" 0)
1210                                      (symbol :tag "Face"
1211                                              gnus-emphasis-highlight-words)))))
1212   :group 'gnus-summary-visual)
1213
1214 (defcustom gnus-summary-show-article-charset-alist
1215   nil
1216   "Alist of number and charset.
1217 The article will be shown with the charset corresponding to the
1218 numbered argument.
1219 For example: ((1 . cn-gb-2312) (2 . big5))."
1220   :version "21.1"
1221   :type '(repeat (cons (number :tag "Argument" 1)
1222                        (symbol :tag "Charset")))
1223   :group 'gnus-charset)
1224
1225 (defcustom gnus-preserve-marks t
1226   "Whether marks are preserved when moving, copying and respooling messages."
1227   :version "21.1"
1228   :type 'boolean
1229   :group 'gnus-summary-marks)
1230
1231 (defcustom gnus-propagate-marks t
1232   "If non-nil, do not propagate marks to the backends."
1233   :version "23.1" ;; No Gnus
1234   :type 'boolean
1235   :group 'gnus-summary-marks)
1236
1237 (defcustom gnus-alter-articles-to-read-function nil
1238   "Function to be called to alter the list of articles to be selected."
1239   :type '(choice (const nil) function)
1240   :group 'gnus-summary)
1241
1242 (defcustom gnus-orphan-score nil
1243   "*All orphans get this score added.  Set in the score file."
1244   :group 'gnus-score-default
1245   :type '(choice (const nil)
1246                  integer))
1247
1248 (defcustom gnus-summary-save-parts-default-mime "image/.*"
1249   "*A regexp to match MIME parts when saving multiple parts of a
1250 message with `gnus-summary-save-parts' (\\<gnus-summary-mode-map>\\[gnus-summary-save-parts]).
1251 This regexp will be used by default when prompting the user for which
1252 type of files to save."
1253   :group 'gnus-summary
1254   :type 'regexp)
1255
1256 (defcustom gnus-read-all-available-headers nil
1257   "Whether Gnus should parse all headers made available to it.
1258 This is mostly relevant for slow back ends where the user may
1259 wish to widen the summary buffer to include all headers
1260 that were fetched.  Say, for nnultimate groups."
1261   :version "22.1"
1262   :group 'gnus-summary
1263   :type '(choice boolean regexp))
1264
1265 (defcustom gnus-summary-pipe-output-default-command nil
1266   "Command (and optional arguments) used to pipe article to subprocess.
1267 This will be used as the default command if it is non-nil.  The value
1268 will be updated if you modify it when executing the command
1269 `gnus-summary-pipe-output' or the function `gnus-summary-save-in-pipe'."
1270   :version "23.1" ;; No Gnus
1271   :group 'gnus-summary
1272   :type '(radio (const :tag "None" nil) (string :tag "Command")))
1273
1274 (defcustom gnus-summary-muttprint-program "muttprint"
1275   "Command (and optional arguments) used to run Muttprint.
1276 The value will be updated if you modify it when executing the command
1277 `gnus-summary-muttprint'."
1278   :version "22.1"
1279   :group 'gnus-summary
1280   :type 'string)
1281
1282 (defcustom gnus-article-loose-mime t
1283   "If non-nil, don't require MIME-Version header.
1284 Some brain-damaged MUA/MTA, e.g. Lotus Domino 5.0.6 clients, does not
1285 supply the MIME-Version header or deliberately strip it from the mail.
1286 If non-nil (the default), Gnus will treat some articles as MIME
1287 even if the MIME-Version header is missing."
1288   :version "22.1"
1289   :type 'boolean
1290   :group 'gnus-article-mime)
1291
1292 (defcustom gnus-article-emulate-mime t
1293   "If non-nil, use MIME emulation for uuencode and the like.
1294 This means that Gnus will search message bodies for text that look
1295 like uuencoded bits, yEncoded bits, and so on, and present that using
1296 the normal Gnus MIME machinery."
1297   :version "22.1"
1298   :type 'boolean
1299   :group 'gnus-article-mime)
1300
1301 ;;; Internal variables
1302
1303 (defvar gnus-summary-display-cache nil)
1304 (defvar gnus-article-mime-handles nil)
1305 (defvar gnus-article-decoded-p nil)
1306 (defvar gnus-article-charset nil)
1307 (defvar gnus-article-ignored-charsets nil)
1308 (defvar gnus-scores-exclude-files nil)
1309 (defvar gnus-page-broken nil)
1310
1311 (defvar gnus-original-article nil)
1312 (defvar gnus-article-internal-prepare-hook nil)
1313 (defvar gnus-newsgroup-process-stack nil)
1314
1315 (defvar gnus-thread-indent-array nil)
1316 (defvar gnus-thread-indent-array-level gnus-thread-indent-level)
1317 (defvar gnus-sort-gathered-threads-function 'gnus-thread-sort-by-number
1318   "Function called to sort the articles within a thread after it has been gathered together.")
1319
1320 (defvar gnus-summary-save-parts-type-history nil)
1321 (defvar gnus-summary-save-parts-last-directory mm-default-directory)
1322
1323 ;; Avoid highlighting in kill files.
1324 (defvar gnus-summary-inhibit-highlight nil)
1325 (defvar gnus-newsgroup-selected-overlay nil)
1326 (defvar gnus-inhibit-limiting nil)
1327 (defvar gnus-newsgroup-adaptive-score-file nil)
1328 (defvar gnus-current-score-file nil)
1329 (defvar gnus-current-move-group nil)
1330 (defvar gnus-current-copy-group nil)
1331 (defvar gnus-current-crosspost-group nil)
1332 (defvar gnus-newsgroup-display nil)
1333
1334 (defvar gnus-newsgroup-dependencies nil)
1335 (defvar gnus-newsgroup-adaptive nil)
1336 (defvar gnus-summary-display-article-function nil)
1337 (defvar gnus-summary-highlight-line-function nil
1338   "Function called after highlighting a summary line.")
1339
1340 (defvar gnus-summary-line-format-alist
1341   `((?N ,(macroexpand '(mail-header-number gnus-tmp-header)) ?d)
1342     (?S ,(macroexpand '(mail-header-subject gnus-tmp-header)) ?s)
1343     (?s gnus-tmp-subject-or-nil ?s)
1344     (?n gnus-tmp-name ?s)
1345     (?A (car (cdr (funcall gnus-extract-address-components gnus-tmp-from)))
1346         ?s)
1347     (?a (or (car (funcall gnus-extract-address-components gnus-tmp-from))
1348             gnus-tmp-from) ?s)
1349     (?F gnus-tmp-from ?s)
1350     (?x ,(macroexpand '(mail-header-xref gnus-tmp-header)) ?s)
1351     (?D ,(macroexpand '(mail-header-date gnus-tmp-header)) ?s)
1352     (?d (gnus-dd-mmm (mail-header-date gnus-tmp-header)) ?s)
1353     (?o (gnus-date-iso8601 (mail-header-date gnus-tmp-header)) ?s)
1354     (?M ,(macroexpand '(mail-header-id gnus-tmp-header)) ?s)
1355     (?r ,(macroexpand '(mail-header-references gnus-tmp-header)) ?s)
1356     (?c (or (mail-header-chars gnus-tmp-header) 0) ?d)
1357     (?k (gnus-summary-line-message-size gnus-tmp-header) ?s)
1358     (?L gnus-tmp-lines ?s)
1359     (?O gnus-tmp-downloaded ?c)
1360     (?I gnus-tmp-indentation ?s)
1361     (?T (if (= gnus-tmp-level 0) "" (make-string (frame-width) ? )) ?s)
1362     (?R gnus-tmp-replied ?c)
1363     (?\[ gnus-tmp-opening-bracket ?c)
1364     (?\] gnus-tmp-closing-bracket ?c)
1365     (?\> (make-string gnus-tmp-level ? ) ?s)
1366     (?\< (make-string (max 0 (- 20 gnus-tmp-level)) ? ) ?s)
1367     (?i gnus-tmp-score ?d)
1368     (?z gnus-tmp-score-char ?c)
1369     (?V (gnus-thread-total-score (and (boundp 'thread) (car thread))) ?d)
1370     (?U gnus-tmp-unread ?c)
1371     (?f (gnus-summary-from-or-to-or-newsgroups gnus-tmp-header gnus-tmp-from)
1372         ?s)
1373     (?t (gnus-summary-number-of-articles-in-thread
1374          (and (boundp 'thread) (car thread)) gnus-tmp-level)
1375         ?d)
1376     (?e (gnus-summary-number-of-articles-in-thread
1377          (and (boundp 'thread) (car thread)) gnus-tmp-level t)
1378         ?c)
1379     (?u gnus-tmp-user-defined ?s)
1380     (?P (gnus-pick-line-number) ?d)
1381     (?B gnus-tmp-thread-tree-header-string ?s)
1382     (user-date (gnus-user-date
1383                 ,(macroexpand '(mail-header-date gnus-tmp-header))) ?s))
1384   "An alist of format specifications that can appear in summary lines.
1385 These are paired with what variables they correspond with, along with
1386 the type of the variable (string, integer, character, etc).")
1387
1388 (defvar gnus-summary-dummy-line-format-alist
1389   `((?S gnus-tmp-subject ?s)
1390     (?N gnus-tmp-number ?d)
1391     (?u gnus-tmp-user-defined ?s)))
1392
1393 (defvar gnus-summary-mode-line-format-alist
1394   `((?G gnus-tmp-group-name ?s)
1395     (?g (gnus-short-group-name gnus-tmp-group-name) ?s)
1396     (?p (gnus-group-real-name gnus-tmp-group-name) ?s)
1397     (?A gnus-tmp-article-number ?d)
1398     (?Z gnus-tmp-unread-and-unselected ?s)
1399     (?V gnus-version ?s)
1400     (?U gnus-tmp-unread-and-unticked ?d)
1401     (?S gnus-tmp-subject ?s)
1402     (?e gnus-tmp-unselected ?d)
1403     (?u gnus-tmp-user-defined ?s)
1404     (?d (length gnus-newsgroup-dormant) ?d)
1405     (?t (length gnus-newsgroup-marked) ?d)
1406     (?h (length gnus-newsgroup-spam-marked) ?d)
1407     (?r (length gnus-newsgroup-reads) ?d)
1408     (?z (gnus-summary-article-score gnus-tmp-article-number) ?d)
1409     (?E gnus-newsgroup-expunged-tally ?d)
1410     (?s (gnus-current-score-file-nondirectory) ?s)))
1411
1412 ;; This is here rather than in gnus-art for compilation reasons.
1413 (defvar gnus-article-mode-line-format-alist
1414   (nconc '((?w (gnus-article-wash-status) ?s)
1415            (?m (gnus-article-mime-part-status) ?s))
1416          gnus-summary-mode-line-format-alist))
1417
1418 (defvar gnus-last-search-regexp nil
1419   "Default regexp for article search command.")
1420
1421 (defvar gnus-last-shell-command nil
1422   "Default shell command on article.")
1423
1424 (defvar gnus-newsgroup-agentized nil
1425   "Locally bound in each summary buffer to indicate whether the server has been agentized.")
1426 (defvar gnus-newsgroup-begin nil)
1427 (defvar gnus-newsgroup-end nil)
1428 (defvar gnus-newsgroup-last-rmail nil)
1429 (defvar gnus-newsgroup-last-mail nil)
1430 (defvar gnus-newsgroup-last-folder nil)
1431 (defvar gnus-newsgroup-last-file nil)
1432 (defvar gnus-newsgroup-last-directory nil)
1433 (defvar gnus-newsgroup-auto-expire nil)
1434 (defvar gnus-newsgroup-active nil)
1435
1436 (defvar gnus-newsgroup-data nil)
1437 (defvar gnus-newsgroup-data-reverse nil)
1438 (defvar gnus-newsgroup-limit nil)
1439 (defvar gnus-newsgroup-limits nil)
1440 (defvar gnus-summary-use-undownloaded-faces nil)
1441
1442 (defvar gnus-newsgroup-unreads nil
1443   "Sorted list of unread articles in the current newsgroup.")
1444
1445 (defvar gnus-newsgroup-unselected nil
1446   "Sorted list of unselected unread articles in the current newsgroup.")
1447
1448 (defvar gnus-newsgroup-reads nil
1449   "Alist of read articles and article marks in the current newsgroup.")
1450
1451 (defvar gnus-newsgroup-expunged-tally nil)
1452
1453 (defvar gnus-newsgroup-marked nil
1454   "Sorted list of ticked articles in the current newsgroup (a subset of unread art).")
1455
1456 (defvar gnus-newsgroup-spam-marked nil
1457   "List of ranges of articles that have been marked as spam.")
1458
1459 (defvar gnus-newsgroup-killed nil
1460   "List of ranges of articles that have been through the scoring process.")
1461
1462 (defvar gnus-newsgroup-cached nil
1463   "Sorted list of articles that come from the article cache.")
1464
1465 (defvar gnus-newsgroup-saved nil
1466   "List of articles that have been saved.")
1467
1468 (defvar gnus-newsgroup-kill-headers nil)
1469
1470 (defvar gnus-newsgroup-replied nil
1471   "List of articles that have been replied to in the current newsgroup.")
1472
1473 (defvar gnus-newsgroup-forwarded nil
1474   "List of articles that have been forwarded in the current newsgroup.")
1475
1476 (defvar gnus-newsgroup-recent nil
1477   "List of articles that have are recent in the current newsgroup.")
1478
1479 (defvar gnus-newsgroup-expirable nil
1480   "Sorted list of articles in the current newsgroup that can be expired.")
1481
1482 (defvar gnus-newsgroup-processable nil
1483   "List of articles in the current newsgroup that can be processed.")
1484
1485 (defvar gnus-newsgroup-downloadable nil
1486   "Sorted list of articles in the current newsgroup that can be processed.")
1487
1488 (defvar gnus-newsgroup-unfetched nil
1489   "Sorted list of articles in the current newsgroup whose headers have
1490 not been fetched into the agent.
1491
1492 This list will always be a subset of gnus-newsgroup-undownloaded.")
1493
1494 (defvar gnus-newsgroup-undownloaded nil
1495   "List of articles in the current newsgroup that haven't been downloaded.")
1496
1497 (defvar gnus-newsgroup-unsendable nil
1498   "List of articles in the current newsgroup that won't be sent.")
1499
1500 (defvar gnus-newsgroup-bookmarks nil
1501   "List of articles in the current newsgroup that have bookmarks.")
1502
1503 (defvar gnus-newsgroup-dormant nil
1504   "Sorted list of dormant articles in the current newsgroup.")
1505
1506 (defvar gnus-newsgroup-unseen nil
1507   "List of unseen articles in the current newsgroup.")
1508
1509 (defvar gnus-newsgroup-seen nil
1510   "Range of seen articles in the current newsgroup.")
1511
1512 (defvar gnus-newsgroup-articles nil
1513   "List of articles in the current newsgroup.")
1514
1515 (defvar gnus-newsgroup-scored nil
1516   "List of scored articles in the current newsgroup.")
1517
1518 (defvar gnus-newsgroup-headers nil
1519   "List of article headers in the current newsgroup.")
1520
1521 (defvar gnus-newsgroup-threads nil)
1522
1523 (defvar gnus-newsgroup-prepared nil
1524   "Whether the current group has been prepared properly.")
1525
1526 (defvar gnus-newsgroup-ancient nil
1527   "List of `gnus-fetch-old-headers' articles in the current newsgroup.")
1528
1529 (defvar gnus-newsgroup-sparse nil)
1530
1531 (defvar gnus-current-article nil)
1532 (defvar gnus-article-current nil)
1533 (defvar gnus-current-headers nil)
1534 (defvar gnus-have-all-headers nil)
1535 (defvar gnus-last-article nil)
1536 (defvar gnus-newsgroup-history nil)
1537 (defvar gnus-newsgroup-charset nil)
1538 (defvar gnus-newsgroup-ephemeral-charset nil)
1539 (defvar gnus-newsgroup-ephemeral-ignored-charsets nil)
1540
1541 (defvar gnus-article-before-search nil)
1542
1543 (defvar gnus-summary-local-variables
1544   '(gnus-newsgroup-name
1545     gnus-newsgroup-begin gnus-newsgroup-end
1546     gnus-newsgroup-last-rmail gnus-newsgroup-last-mail
1547     gnus-newsgroup-last-folder gnus-newsgroup-last-file
1548     gnus-newsgroup-last-directory
1549     gnus-newsgroup-auto-expire gnus-newsgroup-unreads
1550     gnus-newsgroup-unselected gnus-newsgroup-marked
1551     gnus-newsgroup-spam-marked
1552     gnus-newsgroup-reads gnus-newsgroup-saved
1553     gnus-newsgroup-replied gnus-newsgroup-forwarded
1554     gnus-newsgroup-recent
1555     gnus-newsgroup-expirable
1556     gnus-newsgroup-processable gnus-newsgroup-killed
1557     gnus-newsgroup-downloadable gnus-newsgroup-undownloaded
1558     gnus-newsgroup-unfetched
1559     gnus-newsgroup-unsendable gnus-newsgroup-unseen
1560     gnus-newsgroup-seen gnus-newsgroup-articles
1561     gnus-newsgroup-bookmarks gnus-newsgroup-dormant
1562     gnus-newsgroup-headers gnus-newsgroup-threads
1563     gnus-newsgroup-prepared gnus-summary-highlight-line-function
1564     gnus-current-article gnus-current-headers gnus-have-all-headers
1565     gnus-last-article gnus-article-internal-prepare-hook
1566     gnus-newsgroup-dependencies gnus-newsgroup-selected-overlay
1567     gnus-newsgroup-scored gnus-newsgroup-kill-headers
1568     gnus-thread-expunge-below
1569     gnus-score-alist gnus-current-score-file
1570     (gnus-summary-expunge-below . global)
1571     (gnus-summary-mark-below . global)
1572     (gnus-orphan-score . global)
1573     gnus-newsgroup-active gnus-scores-exclude-files
1574     gnus-newsgroup-history gnus-newsgroup-ancient
1575     gnus-newsgroup-sparse gnus-newsgroup-process-stack
1576     (gnus-newsgroup-adaptive . gnus-use-adaptive-scoring)
1577     gnus-newsgroup-adaptive-score-file (gnus-reffed-article-number . -1)
1578     (gnus-newsgroup-expunged-tally . 0)
1579     gnus-cache-removable-articles gnus-newsgroup-cached
1580     gnus-newsgroup-data gnus-newsgroup-data-reverse
1581     gnus-newsgroup-limit gnus-newsgroup-limits
1582     gnus-newsgroup-charset gnus-newsgroup-display
1583     gnus-summary-use-undownloaded-faces)
1584   "Variables that are buffer-local to the summary buffers.")
1585
1586 (defvar gnus-newsgroup-variables nil
1587   "A list of variables that have separate values in different newsgroups.
1588 A list of newsgroup (summary buffer) local variables, or cons of
1589 variables and their default expressions to be evalled (when the default
1590 values are not nil), that should be made global while the summary buffer
1591 is active.
1592
1593 Note: The default expressions will be evaluated (using function `eval')
1594 before assignment to the local variable rather than just assigned to it.
1595 If the default expression is the symbol `global', that symbol will not
1596 be evaluated but the global value of the local variable will be used
1597 instead.
1598
1599 These variables can be used to set variables in the group parameters
1600 while still allowing them to affect operations done in other buffers.
1601 For example:
1602
1603 \(setq gnus-newsgroup-variables
1604      '(message-use-followup-to
1605        (gnus-visible-headers .
1606          \"^From:\\\\|^Newsgroups:\\\\|^Subject:\\\\|^Date:\\\\|^To:\")))
1607 ")
1608
1609 (eval-when-compile
1610   ;; Bind features so that require will believe that gnus-sum has
1611   ;; already been loaded (avoids infinite recursion)
1612   (let ((features (cons 'gnus-sum features)))
1613     (require 'gnus-art)))
1614
1615 ;; MIME stuff.
1616
1617 (defvar gnus-decode-encoded-word-methods
1618   '(mail-decode-encoded-word-string)
1619   "List of methods used to decode encoded words.
1620
1621 This variable is a list of FUNCTION or (REGEXP . FUNCTION).  If item
1622 is FUNCTION, FUNCTION will be apply to all newsgroups.  If item is a
1623 \(REGEXP . FUNCTION), FUNCTION will be only apply to thes newsgroups
1624 whose names match REGEXP.
1625
1626 For example:
1627 \((\"chinese\" . gnus-decode-encoded-word-string-by-guess)
1628  mail-decode-encoded-word-string
1629  (\"chinese\" . rfc1843-decode-string))")
1630
1631 (defvar gnus-decode-encoded-word-methods-cache nil)
1632
1633 (defun gnus-multi-decode-encoded-word-string (string)
1634   "Apply the functions from `gnus-encoded-word-methods' that match."
1635   (unless (and gnus-decode-encoded-word-methods-cache
1636                (eq gnus-newsgroup-name
1637                    (car gnus-decode-encoded-word-methods-cache)))
1638     (setq gnus-decode-encoded-word-methods-cache (list gnus-newsgroup-name))
1639     (dolist (method gnus-decode-encoded-word-methods)
1640       (if (symbolp method)
1641           (nconc gnus-decode-encoded-word-methods-cache (list method))
1642         (if (and gnus-newsgroup-name
1643                  (string-match (car method) gnus-newsgroup-name))
1644             (nconc gnus-decode-encoded-word-methods-cache
1645                    (list (cdr method)))))))
1646   (dolist (method (cdr gnus-decode-encoded-word-methods-cache) string)
1647     (setq string (funcall method string))))
1648
1649 ;; Subject simplification.
1650
1651 (defun gnus-simplify-whitespace (str)
1652   "Remove excessive whitespace from STR."
1653   ;; Multiple spaces.
1654   (while (string-match "[ \t][ \t]+" str)
1655     (setq str (concat (substring str 0 (match-beginning 0))
1656                         " "
1657                         (substring str (match-end 0)))))
1658   ;; Leading spaces.
1659   (when (string-match "^[ \t]+" str)
1660     (setq str (substring str (match-end 0))))
1661   ;; Trailing spaces.
1662   (when (string-match "[ \t]+$" str)
1663     (setq str (substring str 0 (match-beginning 0))))
1664   str)
1665
1666 (defun gnus-simplify-all-whitespace (str)
1667   "Remove all whitespace from STR."
1668   (while (string-match "[ \t\n]+" str)
1669     (setq str (replace-match "" nil nil str)))
1670   str)
1671
1672 (defsubst gnus-simplify-subject-re (subject)
1673   "Remove \"Re:\" from subject lines."
1674   (if (string-match message-subject-re-regexp subject)
1675       (substring subject (match-end 0))
1676     subject))
1677
1678 (defun gnus-simplify-subject (subject &optional re-only)
1679   "Remove `Re:' and words in parentheses.
1680 If RE-ONLY is non-nil, strip leading `Re:'s only."
1681   (let ((case-fold-search t))           ;Ignore case.
1682     ;; Remove `Re:', `Re^N:', `Re(n)', and `Re[n]:'.
1683     (when (string-match "\\`\\(re\\([[(^][0-9]+[])]?\\)?:[ \t]*\\)+" subject)
1684       (setq subject (substring subject (match-end 0))))
1685     ;; Remove uninteresting prefixes.
1686     (when (and (not re-only)
1687                gnus-simplify-ignored-prefixes
1688                (string-match gnus-simplify-ignored-prefixes subject))
1689       (setq subject (substring subject (match-end 0))))
1690     ;; Remove words in parentheses from end.
1691     (unless re-only
1692       (while (string-match "[ \t\n]*([^()]*)[ \t\n]*\\'" subject)
1693         (setq subject (substring subject 0 (match-beginning 0)))))
1694     ;; Return subject string.
1695     subject))
1696
1697 ;; Remove any leading "re:"s, any trailing paren phrases, and simplify
1698 ;; all whitespace.
1699 (defsubst gnus-simplify-buffer-fuzzy-step (regexp &optional newtext)
1700   (goto-char (point-min))
1701   (while (re-search-forward regexp nil t)
1702     (replace-match (or newtext ""))))
1703
1704 (defun gnus-simplify-buffer-fuzzy ()
1705   "Simplify string in the buffer fuzzily.
1706 The string in the accessible portion of the current buffer is simplified.
1707 It is assumed to be a single-line subject.
1708 Whitespace is generally cleaned up, and miscellaneous leading/trailing
1709 matter is removed.  Additional things can be deleted by setting
1710 `gnus-simplify-subject-fuzzy-regexp'."
1711   (let ((case-fold-search t)
1712         (modified-tick))
1713     (gnus-simplify-buffer-fuzzy-step "\t" " ")
1714
1715     (while (not (eq modified-tick (buffer-modified-tick)))
1716       (setq modified-tick (buffer-modified-tick))
1717       (cond
1718        ((listp gnus-simplify-subject-fuzzy-regexp)
1719         (mapc 'gnus-simplify-buffer-fuzzy-step
1720               gnus-simplify-subject-fuzzy-regexp))
1721        (gnus-simplify-subject-fuzzy-regexp
1722         (gnus-simplify-buffer-fuzzy-step gnus-simplify-subject-fuzzy-regexp)))
1723       (gnus-simplify-buffer-fuzzy-step "^ *\\[[-+?*!][-+?*!]\\] *")
1724       (gnus-simplify-buffer-fuzzy-step
1725        "^ *\\(re\\|fw\\|fwd\\)[[{(^0-9]*[])}]?[:;] *")
1726       (gnus-simplify-buffer-fuzzy-step "^[[].*:\\( .*\\)[]]$" "\\1"))
1727
1728     (gnus-simplify-buffer-fuzzy-step " *[[{(][^()\n]*[]})] *$")
1729     (gnus-simplify-buffer-fuzzy-step "  +" " ")
1730     (gnus-simplify-buffer-fuzzy-step " $")
1731     (gnus-simplify-buffer-fuzzy-step "^ +")))
1732
1733 (defun gnus-simplify-subject-fuzzy (subject)
1734   "Simplify a subject string fuzzily.
1735 See `gnus-simplify-buffer-fuzzy' for details."
1736   (save-excursion
1737     (gnus-set-work-buffer)
1738     (let ((case-fold-search t))
1739       ;; Remove uninteresting prefixes.
1740       (when (and gnus-simplify-ignored-prefixes
1741                  (string-match gnus-simplify-ignored-prefixes subject))
1742         (setq subject (substring subject (match-end 0))))
1743       (insert subject)
1744       (inline (gnus-simplify-buffer-fuzzy))
1745       (buffer-string))))
1746
1747 (defsubst gnus-simplify-subject-fully (subject)
1748   "Simplify a subject string according to `gnus-summary-gather-subject-limit'."
1749   (cond
1750    (gnus-simplify-subject-functions
1751     (gnus-map-function gnus-simplify-subject-functions subject))
1752    ((null gnus-summary-gather-subject-limit)
1753     (gnus-simplify-subject-re subject))
1754    ((eq gnus-summary-gather-subject-limit 'fuzzy)
1755     (gnus-simplify-subject-fuzzy subject))
1756    ((numberp gnus-summary-gather-subject-limit)
1757     (truncate-string-to-width (gnus-simplify-subject-re subject)
1758                               gnus-summary-gather-subject-limit))
1759    (t
1760     subject)))
1761
1762 (defsubst gnus-subject-equal (s1 s2 &optional simple-first)
1763   "Check whether two subjects are equal.
1764 If optional argument SIMPLE-FIRST is t, first argument is already
1765 simplified."
1766   (cond
1767    ((null simple-first)
1768     (equal (gnus-simplify-subject-fully s1)
1769            (gnus-simplify-subject-fully s2)))
1770    (t
1771     (equal s1
1772            (gnus-simplify-subject-fully s2)))))
1773
1774 (defun gnus-summary-bubble-group ()
1775   "Increase the score of the current group.
1776 This is a handy function to add to `gnus-summary-exit-hook' to
1777 increase the score of each group you read."
1778   (gnus-group-add-score gnus-newsgroup-name))
1779
1780 \f
1781 ;;;
1782 ;;; Gnus summary mode
1783 ;;;
1784
1785 (put 'gnus-summary-mode 'mode-class 'special)
1786
1787 (defvar gnus-article-commands-menu)
1788
1789 ;; Non-orthogonal keys
1790
1791 (gnus-define-keys gnus-summary-mode-map
1792   " " gnus-summary-next-page
1793   "\177" gnus-summary-prev-page
1794   [delete] gnus-summary-prev-page
1795   [backspace] gnus-summary-prev-page
1796   "\r" gnus-summary-scroll-up
1797   "\M-\r" gnus-summary-scroll-down
1798   "n" gnus-summary-next-unread-article
1799   "p" gnus-summary-prev-unread-article
1800   "N" gnus-summary-next-article
1801   "P" gnus-summary-prev-article
1802   "\M-\C-n" gnus-summary-next-same-subject
1803   "\M-\C-p" gnus-summary-prev-same-subject
1804   "\M-n" gnus-summary-next-unread-subject
1805   "\M-p" gnus-summary-prev-unread-subject
1806   "." gnus-summary-first-unread-article
1807   "," gnus-summary-best-unread-article
1808   "\M-s" gnus-summary-search-article-forward
1809   "\M-r" gnus-summary-search-article-backward
1810   "\M-S" gnus-summary-repeat-search-article-forward
1811   "\M-R" gnus-summary-repeat-search-article-backward
1812   "<" gnus-summary-beginning-of-article
1813   ">" gnus-summary-end-of-article
1814   "j" gnus-summary-goto-article
1815   "^" gnus-summary-refer-parent-article
1816   "\M-^" gnus-summary-refer-article
1817   "u" gnus-summary-tick-article-forward
1818   "!" gnus-summary-tick-article-forward
1819   "U" gnus-summary-tick-article-backward
1820   "d" gnus-summary-mark-as-read-forward
1821   "D" gnus-summary-mark-as-read-backward
1822   "E" gnus-summary-mark-as-expirable
1823   "\M-u" gnus-summary-clear-mark-forward
1824   "\M-U" gnus-summary-clear-mark-backward
1825   "k" gnus-summary-kill-same-subject-and-select
1826   "\C-k" gnus-summary-kill-same-subject
1827   "\M-\C-k" gnus-summary-kill-thread
1828   "\M-\C-l" gnus-summary-lower-thread
1829   "e" gnus-summary-edit-article
1830   "#" gnus-summary-mark-as-processable
1831   "\M-#" gnus-summary-unmark-as-processable
1832   "\M-\C-t" gnus-summary-toggle-threads
1833   "\M-\C-s" gnus-summary-show-thread
1834   "\M-\C-h" gnus-summary-hide-thread
1835   "\M-\C-f" gnus-summary-next-thread
1836   "\M-\C-b" gnus-summary-prev-thread
1837   [(meta down)] gnus-summary-next-thread
1838   [(meta up)] gnus-summary-prev-thread
1839   "\M-\C-u" gnus-summary-up-thread
1840   "\M-\C-d" gnus-summary-down-thread
1841   "&" gnus-summary-execute-command
1842   "c" gnus-summary-catchup-and-exit
1843   "\C-w" gnus-summary-mark-region-as-read
1844   "\C-t" gnus-summary-toggle-truncation
1845   "?" gnus-summary-mark-as-dormant
1846   "\C-c\M-\C-s" gnus-summary-limit-include-expunged
1847   "\C-c\C-s\C-n" gnus-summary-sort-by-number
1848   "\C-c\C-s\C-m\C-n" gnus-summary-sort-by-most-recent-number
1849   "\C-c\C-s\C-l" gnus-summary-sort-by-lines
1850   "\C-c\C-s\C-c" gnus-summary-sort-by-chars
1851   "\C-c\C-s\C-a" gnus-summary-sort-by-author
1852   "\C-c\C-s\C-t" gnus-summary-sort-by-recipient
1853   "\C-c\C-s\C-s" gnus-summary-sort-by-subject
1854   "\C-c\C-s\C-d" gnus-summary-sort-by-date
1855   "\C-c\C-s\C-m\C-d" gnus-summary-sort-by-most-recent-date
1856   "\C-c\C-s\C-i" gnus-summary-sort-by-score
1857   "\C-c\C-s\C-o" gnus-summary-sort-by-original
1858   "\C-c\C-s\C-r" gnus-summary-sort-by-random
1859   "=" gnus-summary-expand-window
1860   "\C-x\C-s" gnus-summary-reselect-current-group
1861   "\M-g" gnus-summary-rescan-group
1862   "\C-c\C-r" gnus-summary-caesar-message
1863   "f" gnus-summary-followup
1864   "F" gnus-summary-followup-with-original
1865   "C" gnus-summary-cancel-article
1866   "r" gnus-summary-reply
1867   "R" gnus-summary-reply-with-original
1868   "\C-c\C-f" gnus-summary-mail-forward
1869   "o" gnus-summary-save-article
1870   "\C-o" gnus-summary-save-article-mail
1871   "|" gnus-summary-pipe-output
1872   "\M-k" gnus-summary-edit-local-kill
1873   "\M-K" gnus-summary-edit-global-kill
1874   ;; "V" gnus-version
1875   "\C-c\C-d" gnus-summary-describe-group
1876   "q" gnus-summary-exit
1877   "Q" gnus-summary-exit-no-update
1878   "\C-c\C-i" gnus-info-find-node
1879   gnus-mouse-2 gnus-mouse-pick-article
1880   [follow-link] mouse-face
1881   "m" gnus-summary-mail-other-window
1882   "a" gnus-summary-post-news
1883   "x" gnus-summary-limit-to-unread
1884   "s" gnus-summary-isearch-article
1885   "t" gnus-summary-toggle-header
1886   "g" gnus-summary-show-article
1887   "l" gnus-summary-goto-last-article
1888   "\C-c\C-v\C-v" gnus-uu-decode-uu-view
1889   "\C-d" gnus-summary-enter-digest-group
1890   "\M-\C-d" gnus-summary-read-document
1891   "\M-\C-e" gnus-summary-edit-parameters
1892   "\M-\C-a" gnus-summary-customize-parameters
1893   "\C-c\C-b" gnus-bug
1894   "*" gnus-cache-enter-article
1895   "\M-*" gnus-cache-remove-article
1896   "\M-&" gnus-summary-universal-argument
1897   "\C-l" gnus-recenter
1898   "I" gnus-summary-increase-score
1899   "L" gnus-summary-lower-score
1900   "\M-i" gnus-symbolic-argument
1901   "h" gnus-summary-select-article-buffer
1902
1903   "b" gnus-article-view-part
1904   "\M-t" gnus-summary-toggle-display-buttonized
1905
1906   "V" gnus-summary-score-map
1907   "X" gnus-uu-extract-map
1908   "S" gnus-summary-send-map)
1909
1910 ;; Sort of orthogonal keymap
1911 (gnus-define-keys (gnus-summary-mark-map "M" gnus-summary-mode-map)
1912   "t" gnus-summary-tick-article-forward
1913   "!" gnus-summary-tick-article-forward
1914   "d" gnus-summary-mark-as-read-forward
1915   "r" gnus-summary-mark-as-read-forward
1916   "c" gnus-summary-clear-mark-forward
1917   " " gnus-summary-clear-mark-forward
1918   "e" gnus-summary-mark-as-expirable
1919   "x" gnus-summary-mark-as-expirable
1920   "?" gnus-summary-mark-as-dormant
1921   "b" gnus-summary-set-bookmark
1922   "B" gnus-summary-remove-bookmark
1923   "#" gnus-summary-mark-as-processable
1924   "\M-#" gnus-summary-unmark-as-processable
1925   "S" gnus-summary-limit-include-expunged
1926   "C" gnus-summary-catchup
1927   "H" gnus-summary-catchup-to-here
1928   "h" gnus-summary-catchup-from-here
1929   "\C-c" gnus-summary-catchup-all
1930   "k" gnus-summary-kill-same-subject-and-select
1931   "K" gnus-summary-kill-same-subject
1932   "P" gnus-uu-mark-map)
1933
1934 (gnus-define-keys (gnus-summary-mscore-map "V" gnus-summary-mark-map)
1935   "c" gnus-summary-clear-above
1936   "u" gnus-summary-tick-above
1937   "m" gnus-summary-mark-above
1938   "k" gnus-summary-kill-below)
1939
1940 (gnus-define-keys (gnus-summary-limit-map "/" gnus-summary-mode-map)
1941   "/" gnus-summary-limit-to-subject
1942   "n" gnus-summary-limit-to-articles
1943   "b" gnus-summary-limit-to-bodies
1944   "h" gnus-summary-limit-to-headers
1945   "w" gnus-summary-pop-limit
1946   "s" gnus-summary-limit-to-subject
1947   "a" gnus-summary-limit-to-author
1948   "u" gnus-summary-limit-to-unread
1949   "m" gnus-summary-limit-to-marks
1950   "M" gnus-summary-limit-exclude-marks
1951   "v" gnus-summary-limit-to-score
1952   "*" gnus-summary-limit-include-cached
1953   "D" gnus-summary-limit-include-dormant
1954   "T" gnus-summary-limit-include-thread
1955   "d" gnus-summary-limit-exclude-dormant
1956   "t" gnus-summary-limit-to-age
1957   "." gnus-summary-limit-to-unseen
1958   "x" gnus-summary-limit-to-extra
1959   "p" gnus-summary-limit-to-display-predicate
1960   "E" gnus-summary-limit-include-expunged
1961   "c" gnus-summary-limit-exclude-childless-dormant
1962   "C" gnus-summary-limit-mark-excluded-as-read
1963   "o" gnus-summary-insert-old-articles
1964   "N" gnus-summary-insert-new-articles
1965   "S" gnus-summary-limit-to-singletons
1966   "r" gnus-summary-limit-to-replied
1967   "R" gnus-summary-limit-to-recipient
1968   "A" gnus-summary-limit-to-address)
1969
1970 (gnus-define-keys (gnus-summary-goto-map "G" gnus-summary-mode-map)
1971   "n" gnus-summary-next-unread-article
1972   "p" gnus-summary-prev-unread-article
1973   "N" gnus-summary-next-article
1974   "P" gnus-summary-prev-article
1975   "\C-n" gnus-summary-next-same-subject
1976   "\C-p" gnus-summary-prev-same-subject
1977   "\M-n" gnus-summary-next-unread-subject
1978   "\M-p" gnus-summary-prev-unread-subject
1979   "f" gnus-summary-first-unread-article
1980   "b" gnus-summary-best-unread-article
1981   "j" gnus-summary-goto-article
1982   "g" gnus-summary-goto-subject
1983   "l" gnus-summary-goto-last-article
1984   "o" gnus-summary-pop-article)
1985
1986 (gnus-define-keys (gnus-summary-thread-map "T" gnus-summary-mode-map)
1987   "k" gnus-summary-kill-thread
1988   "E" gnus-summary-expire-thread
1989   "l" gnus-summary-lower-thread
1990   "i" gnus-summary-raise-thread
1991   "T" gnus-summary-toggle-threads
1992   "t" gnus-summary-rethread-current
1993   "^" gnus-summary-reparent-thread
1994   "\M-^" gnus-summary-reparent-children
1995   "s" gnus-summary-show-thread
1996   "S" gnus-summary-show-all-threads
1997   "h" gnus-summary-hide-thread
1998   "H" gnus-summary-hide-all-threads
1999   "n" gnus-summary-next-thread
2000   "p" gnus-summary-prev-thread
2001   "u" gnus-summary-up-thread
2002   "o" gnus-summary-top-thread
2003   "d" gnus-summary-down-thread
2004   "#" gnus-uu-mark-thread
2005   "\M-#" gnus-uu-unmark-thread)
2006
2007 (gnus-define-keys (gnus-summary-buffer-map "Y" gnus-summary-mode-map)
2008   "g" gnus-summary-prepare
2009   "c" gnus-summary-insert-cached-articles
2010   "d" gnus-summary-insert-dormant-articles
2011   "t" gnus-summary-insert-ticked-articles)
2012
2013 (gnus-define-keys (gnus-summary-exit-map "Z" gnus-summary-mode-map)
2014   "c" gnus-summary-catchup-and-exit
2015   "C" gnus-summary-catchup-all-and-exit
2016   "E" gnus-summary-exit-no-update
2017   "Q" gnus-summary-exit
2018   "Z" gnus-summary-exit
2019   "n" gnus-summary-catchup-and-goto-next-group
2020   "p" gnus-summary-catchup-and-goto-prev-group
2021   "R" gnus-summary-reselect-current-group
2022   "G" gnus-summary-rescan-group
2023   "N" gnus-summary-next-group
2024   "s" gnus-summary-save-newsrc
2025   "P" gnus-summary-prev-group)
2026
2027 (gnus-define-keys (gnus-summary-article-map "A" gnus-summary-mode-map)
2028   " " gnus-summary-next-page
2029   "n" gnus-summary-next-page
2030   "\177" gnus-summary-prev-page
2031   [delete] gnus-summary-prev-page
2032   "p" gnus-summary-prev-page
2033   "\r" gnus-summary-scroll-up
2034   "\M-\r" gnus-summary-scroll-down
2035   "<" gnus-summary-beginning-of-article
2036   ">" gnus-summary-end-of-article
2037   "b" gnus-summary-beginning-of-article
2038   "e" gnus-summary-end-of-article
2039   "^" gnus-summary-refer-parent-article
2040   "r" gnus-summary-refer-parent-article
2041   "D" gnus-summary-enter-digest-group
2042   "R" gnus-summary-refer-references
2043   "T" gnus-summary-refer-thread
2044   "g" gnus-summary-show-article
2045   "s" gnus-summary-isearch-article
2046   "P" gnus-summary-print-article
2047   "S" gnus-sticky-article
2048   "M" gnus-mailing-list-insinuate
2049   "t" gnus-article-babel)
2050
2051 (gnus-define-keys (gnus-summary-wash-map "W" gnus-summary-mode-map)
2052   "b" gnus-article-add-buttons
2053   "B" gnus-article-add-buttons-to-head
2054   "o" gnus-article-treat-overstrike
2055   "e" gnus-article-emphasize
2056   "w" gnus-article-fill-cited-article
2057   "Q" gnus-article-fill-long-lines
2058   "L" gnus-article-toggle-truncate-lines
2059   "C" gnus-article-capitalize-sentences
2060   "c" gnus-article-remove-cr
2061   "q" gnus-article-de-quoted-unreadable
2062   "6" gnus-article-de-base64-unreadable
2063   "Z" gnus-article-decode-HZ
2064   "A" gnus-article-treat-ansi-sequences
2065   "h" gnus-article-wash-html
2066   "u" gnus-article-unsplit-urls
2067   "s" gnus-summary-force-verify-and-decrypt
2068   "f" gnus-article-display-x-face
2069   "l" gnus-summary-stop-page-breaking
2070   "r" gnus-summary-caesar-message
2071   "m" gnus-summary-morse-message
2072   "t" gnus-summary-toggle-header
2073   "g" gnus-treat-smiley
2074   "v" gnus-summary-verbose-headers
2075   "a" gnus-article-strip-headers-in-body ;; mnemonic: wash archive
2076   "p" gnus-article-verify-x-pgp-sig
2077   "d" gnus-article-treat-dumbquotes
2078   "i" gnus-summary-idna-message)
2079
2080 (gnus-define-keys (gnus-summary-wash-deuglify-map "Y" gnus-summary-wash-map)
2081   ;; mnemonic: deuglif*Y*
2082   "u" gnus-article-outlook-unwrap-lines
2083   "a" gnus-article-outlook-repair-attribution
2084   "c" gnus-article-outlook-rearrange-citation
2085   "f" gnus-article-outlook-deuglify-article) ;; mnemonic: full deuglify
2086
2087 (gnus-define-keys (gnus-summary-wash-hide-map "W" gnus-summary-wash-map)
2088   "a" gnus-article-hide
2089   "h" gnus-article-hide-headers
2090   "b" gnus-article-hide-boring-headers
2091   "s" gnus-article-hide-signature
2092   "c" gnus-article-hide-citation
2093   "C" gnus-article-hide-citation-in-followups
2094   "l" gnus-article-hide-list-identifiers
2095   "B" gnus-article-strip-banner
2096   "P" gnus-article-hide-pem
2097   "\C-c" gnus-article-hide-citation-maybe)
2098
2099 (gnus-define-keys (gnus-summary-wash-highlight-map "H" gnus-summary-wash-map)
2100   "a" gnus-article-highlight
2101   "h" gnus-article-highlight-headers
2102   "c" gnus-article-highlight-citation
2103   "s" gnus-article-highlight-signature)
2104
2105 (gnus-define-keys (gnus-summary-wash-header-map "G" gnus-summary-wash-map)
2106   "f" gnus-article-treat-fold-headers
2107   "u" gnus-article-treat-unfold-headers
2108   "n" gnus-article-treat-fold-newsgroups)
2109
2110 (gnus-define-keys (gnus-summary-wash-display-map "D" gnus-summary-wash-map)
2111   "x" gnus-article-display-x-face
2112   "d" gnus-article-display-face
2113   "s" gnus-treat-smiley
2114   "D" gnus-article-remove-images
2115   "f" gnus-treat-from-picon
2116   "m" gnus-treat-mail-picon
2117   "n" gnus-treat-newsgroups-picon)
2118
2119 (gnus-define-keys (gnus-summary-wash-mime-map "M" gnus-summary-wash-map)
2120   "w" gnus-article-decode-mime-words
2121   "c" gnus-article-decode-charset
2122   "v" gnus-mime-view-all-parts
2123   "b" gnus-article-view-part)
2124
2125 (gnus-define-keys (gnus-summary-wash-time-map "T" gnus-summary-wash-map)
2126   "z" gnus-article-date-ut
2127   "u" gnus-article-date-ut
2128   "l" gnus-article-date-local
2129   "p" gnus-article-date-english
2130   "e" gnus-article-date-lapsed
2131   "o" gnus-article-date-original
2132   "i" gnus-article-date-iso8601
2133   "s" gnus-article-date-user)
2134
2135 (gnus-define-keys (gnus-summary-wash-empty-map "E" gnus-summary-wash-map)
2136   "t" gnus-article-remove-trailing-blank-lines
2137   "l" gnus-article-strip-leading-blank-lines
2138   "m" gnus-article-strip-multiple-blank-lines
2139   "a" gnus-article-strip-blank-lines
2140   "A" gnus-article-strip-all-blank-lines
2141   "s" gnus-article-strip-leading-space
2142   "e" gnus-article-strip-trailing-space
2143   "w" gnus-article-remove-leading-whitespace)
2144
2145 (gnus-define-keys (gnus-summary-help-map "H" gnus-summary-mode-map)
2146   "v" gnus-version
2147   "f" gnus-summary-fetch-faq
2148   "d" gnus-summary-describe-group
2149   "h" gnus-summary-describe-briefly
2150   "i" gnus-info-find-node
2151   "c" gnus-group-fetch-charter
2152   "C" gnus-group-fetch-control)
2153
2154 (gnus-define-keys (gnus-summary-backend-map "B" gnus-summary-mode-map)
2155   "e" gnus-summary-expire-articles
2156   "\M-\C-e" gnus-summary-expire-articles-now
2157   "\177" gnus-summary-delete-article
2158   [delete] gnus-summary-delete-article
2159   [backspace] gnus-summary-delete-article
2160   "m" gnus-summary-move-article
2161   "r" gnus-summary-respool-article
2162   "w" gnus-summary-edit-article
2163   "c" gnus-summary-copy-article
2164   "B" gnus-summary-crosspost-article
2165   "q" gnus-summary-respool-query
2166   "t" gnus-summary-respool-trace
2167   "i" gnus-summary-import-article
2168   "I" gnus-summary-create-article
2169   "p" gnus-summary-article-posted-p)
2170
2171 (gnus-define-keys (gnus-summary-save-map "O" gnus-summary-mode-map)
2172   "o" gnus-summary-save-article
2173   "m" gnus-summary-save-article-mail
2174   "F" gnus-summary-write-article-file
2175   "r" gnus-summary-save-article-rmail
2176   "f" gnus-summary-save-article-file
2177   "b" gnus-summary-save-article-body-file
2178   "B" gnus-summary-write-article-body-file
2179   "h" gnus-summary-save-article-folder
2180   "v" gnus-summary-save-article-vm
2181   "p" gnus-summary-pipe-output
2182   "P" gnus-summary-muttprint
2183   "s" gnus-soup-add-article)
2184
2185 (gnus-define-keys (gnus-summary-mime-map "K" gnus-summary-mode-map)
2186   "b" gnus-summary-display-buttonized
2187   "m" gnus-summary-repair-multipart
2188   "v" gnus-article-view-part
2189   "o" gnus-article-save-part
2190   "O" gnus-article-save-part-and-strip
2191   "r" gnus-article-replace-part
2192   "d" gnus-article-delete-part
2193   "t" gnus-article-view-part-as-type
2194   "j" gnus-article-jump-to-part
2195   "c" gnus-article-copy-part
2196   "C" gnus-article-view-part-as-charset
2197   "e" gnus-article-view-part-externally
2198   "H" gnus-article-browse-html-article
2199   "E" gnus-article-encrypt-body
2200   "i" gnus-article-inline-part
2201   "|" gnus-article-pipe-part)
2202
2203 (gnus-define-keys (gnus-uu-mark-map "P" gnus-summary-mark-map)
2204   "p" gnus-summary-mark-as-processable
2205   "u" gnus-summary-unmark-as-processable
2206   "U" gnus-summary-unmark-all-processable
2207   "v" gnus-uu-mark-over
2208   "s" gnus-uu-mark-series
2209   "r" gnus-uu-mark-region
2210   "g" gnus-uu-unmark-region
2211   "R" gnus-uu-mark-by-regexp
2212   "G" gnus-uu-unmark-by-regexp
2213   "t" gnus-uu-mark-thread
2214   "T" gnus-uu-unmark-thread
2215   "a" gnus-uu-mark-all
2216   "b" gnus-uu-mark-buffer
2217   "S" gnus-uu-mark-sparse
2218   "k" gnus-summary-kill-process-mark
2219   "y" gnus-summary-yank-process-mark
2220   "w" gnus-summary-save-process-mark
2221   "i" gnus-uu-invert-processable)
2222
2223 (gnus-define-keys (gnus-uu-extract-map "X" gnus-summary-mode-map)
2224   ;;"x" gnus-uu-extract-any
2225   "m" gnus-summary-save-parts
2226   "u" gnus-uu-decode-uu
2227   "U" gnus-uu-decode-uu-and-save
2228   "s" gnus-uu-decode-unshar
2229   "S" gnus-uu-decode-unshar-and-save
2230   "o" gnus-uu-decode-save
2231   "O" gnus-uu-decode-save
2232   "b" gnus-uu-decode-binhex
2233   "B" gnus-uu-decode-binhex
2234   "Y" gnus-uu-decode-yenc
2235   "p" gnus-uu-decode-postscript
2236   "P" gnus-uu-decode-postscript-and-save)
2237
2238 (gnus-define-keys
2239     (gnus-uu-extract-view-map "v" gnus-uu-extract-map)
2240   "u" gnus-uu-decode-uu-view
2241   "U" gnus-uu-decode-uu-and-save-view
2242   "s" gnus-uu-decode-unshar-view
2243   "S" gnus-uu-decode-unshar-and-save-view
2244   "o" gnus-uu-decode-save-view
2245   "O" gnus-uu-decode-save-view
2246   "b" gnus-uu-decode-binhex-view
2247   "B" gnus-uu-decode-binhex-view
2248   "p" gnus-uu-decode-postscript-view
2249   "P" gnus-uu-decode-postscript-and-save-view)
2250
2251 (defvar gnus-article-post-menu nil)
2252
2253 (defconst gnus-summary-menu-maxlen 20)
2254
2255 (defun gnus-summary-menu-split (menu)
2256   ;; If we have lots of elements, divide them into groups of 20
2257   ;; and make a pane (or submenu) for each one.
2258   (if (> (length menu) (/ (* gnus-summary-menu-maxlen 3) 2))
2259       (let ((menu menu) sublists next
2260             (i 1))
2261         (while menu
2262           ;; Pull off the next gnus-summary-menu-maxlen elements
2263           ;; and make them the next element of sublist.
2264           (setq next (nthcdr gnus-summary-menu-maxlen menu))
2265           (if next
2266               (setcdr (nthcdr (1- gnus-summary-menu-maxlen) menu)
2267                       nil))
2268           (setq sublists (cons (cons (format "%s ... %s" (aref (car menu) 0)
2269                                              (aref (car (last menu)) 0)) menu)
2270                                sublists))
2271           (setq i (1+ i))
2272           (setq menu next))
2273         (nreverse sublists))
2274     ;; Few elements--put them all in one pane.
2275     menu))
2276
2277 (defun gnus-summary-make-menu-bar ()
2278   (gnus-turn-off-edit-menu 'summary)
2279
2280   (unless (boundp 'gnus-summary-misc-menu)
2281
2282     (easy-menu-define
2283       gnus-summary-kill-menu gnus-summary-mode-map ""
2284       (cons
2285        "Score"
2286        (nconc
2287         (list
2288          ["Customize" gnus-score-customize t])
2289         (gnus-make-score-map 'increase)
2290         (gnus-make-score-map 'lower)
2291         '(("Mark"
2292            ["Kill below" gnus-summary-kill-below t]
2293            ["Mark above" gnus-summary-mark-above t]
2294            ["Tick above" gnus-summary-tick-above t]
2295            ["Clear above" gnus-summary-clear-above t])
2296           ["Current score" gnus-summary-current-score t]
2297           ["Set score" gnus-summary-set-score t]
2298           ["Switch current score file..." gnus-score-change-score-file t]
2299           ["Set mark below..." gnus-score-set-mark-below t]
2300           ["Set expunge below..." gnus-score-set-expunge-below t]
2301           ["Edit current score file" gnus-score-edit-current-scores t]
2302           ["Edit score file..." gnus-score-edit-file t]
2303           ["Trace score" gnus-score-find-trace t]
2304           ["Find words" gnus-score-find-favourite-words t]
2305           ["Rescore buffer" gnus-summary-rescore t]
2306           ["Increase score..." gnus-summary-increase-score t]
2307           ["Lower score..." gnus-summary-lower-score t]))))
2308
2309     ;; Define both the Article menu in the summary buffer and the
2310     ;; equivalent Commands menu in the article buffer here for
2311     ;; consistency.
2312     (let ((innards
2313            `(("Hide"
2314               ["All" gnus-article-hide t]
2315               ["Headers" gnus-article-hide-headers t]
2316               ["Signature" gnus-article-hide-signature t]
2317               ["Citation" gnus-article-hide-citation t]
2318               ["List identifiers" gnus-article-hide-list-identifiers t]
2319               ["Banner" gnus-article-strip-banner t]
2320               ["Boring headers" gnus-article-hide-boring-headers t])
2321              ("Highlight"
2322               ["All" gnus-article-highlight t]
2323               ["Headers" gnus-article-highlight-headers t]
2324               ["Signature" gnus-article-highlight-signature t]
2325               ["Citation" gnus-article-highlight-citation t])
2326              ("MIME"
2327               ["Words" gnus-article-decode-mime-words t]
2328               ["Charset" gnus-article-decode-charset t]
2329               ["QP" gnus-article-de-quoted-unreadable t]
2330               ["Base64" gnus-article-de-base64-unreadable t]
2331               ["View MIME buttons" gnus-summary-display-buttonized t]
2332               ["View all" gnus-mime-view-all-parts t]
2333               ["Verify and Decrypt" gnus-summary-force-verify-and-decrypt t]
2334               ["Encrypt body" gnus-article-encrypt-body
2335                :active (not (gnus-group-read-only-p))
2336                ,@(if (featurep 'xemacs) nil
2337                    '(:help "Encrypt the message body on disk"))]
2338               ["Extract all parts..." gnus-summary-save-parts t]
2339               ("Multipart"
2340                ["Repair multipart" gnus-summary-repair-multipart t]
2341                ["Pipe part..." gnus-article-pipe-part t]
2342                ["Inline part" gnus-article-inline-part t]
2343                ["View part as type..." gnus-article-view-part-as-type t]
2344                ["Encrypt body" gnus-article-encrypt-body
2345                 :active (not (gnus-group-read-only-p))
2346                ,@(if (featurep 'xemacs) nil
2347                    '(:help "Encrypt the message body on disk"))]
2348                ["View part externally" gnus-article-view-part-externally t]
2349                ["View HTML parts in browser" gnus-article-browse-html-article t]
2350                ["View part with charset..." gnus-article-view-part-as-charset t]
2351                ["Copy part" gnus-article-copy-part t]
2352                ["Save part..." gnus-article-save-part t]
2353                ["View part" gnus-article-view-part t]))
2354              ("Date"
2355               ["Local" gnus-article-date-local t]
2356               ["ISO8601" gnus-article-date-iso8601 t]
2357               ["UT" gnus-article-date-ut t]
2358               ["Original" gnus-article-date-original t]
2359               ["Lapsed" gnus-article-date-lapsed t]
2360               ["User-defined" gnus-article-date-user t])
2361              ("Display"
2362               ["Remove images" gnus-article-remove-images t]
2363               ["Toggle smiley" gnus-treat-smiley t]
2364               ["Show X-Face" gnus-article-display-x-face t]
2365               ["Show picons in From" gnus-treat-from-picon t]
2366               ["Show picons in mail headers" gnus-treat-mail-picon t]
2367               ["Show picons in news headers" gnus-treat-newsgroups-picon t]
2368               ("View as different encoding"
2369                ,@(gnus-summary-menu-split
2370                   (mapcar
2371                    (lambda (cs)
2372                      ;; Since easymenu under Emacs doesn't allow
2373                      ;; lambda forms for menu commands, we should
2374                      ;; provide intern'ed function symbols.
2375                      (let ((command (intern (format "\
2376 gnus-summary-show-article-from-menu-as-charset-%s" cs))))
2377                        (fset command
2378                              `(lambda ()
2379                                 (interactive)
2380                                 (let ((gnus-summary-show-article-charset-alist
2381                                        '((1 . ,cs))))
2382                                   (gnus-summary-show-article 1))))
2383                        `[,(symbol-name cs) ,command t]))
2384                    (sort (if (fboundp 'coding-system-list)
2385                              (coding-system-list)
2386                            (mapcar 'car mm-mime-mule-charset-alist))
2387                          'string<)))))
2388              ("Washing"
2389               ("Remove Blanks"
2390                ["Leading" gnus-article-strip-leading-blank-lines t]
2391                ["Multiple" gnus-article-strip-multiple-blank-lines t]
2392                ["Trailing" gnus-article-remove-trailing-blank-lines t]
2393                ["All of the above" gnus-article-strip-blank-lines t]
2394                ["All" gnus-article-strip-all-blank-lines t]
2395                ["Leading space" gnus-article-strip-leading-space t]
2396                ["Trailing space" gnus-article-strip-trailing-space t]
2397                ["Leading space in headers"
2398                 gnus-article-remove-leading-whitespace t])
2399               ["Overstrike" gnus-article-treat-overstrike t]
2400               ["Dumb quotes" gnus-article-treat-dumbquotes t]
2401               ["Emphasis" gnus-article-emphasize t]
2402               ["Word wrap" gnus-article-fill-cited-article t]
2403               ["Fill long lines" gnus-article-fill-long-lines t]
2404               ["Toggle truncate long lines" gnus-article-toggle-truncate-lines t]
2405               ["Capitalize sentences" gnus-article-capitalize-sentences t]
2406               ["Remove CR" gnus-article-remove-cr t]
2407               ["Quoted-Printable" gnus-article-de-quoted-unreadable t]
2408               ["Base64" gnus-article-de-base64-unreadable t]
2409               ["Rot 13" gnus-summary-caesar-message
2410                ,@(if (featurep 'xemacs) '(t)
2411                    '(:help "\"Caesar rotate\" article by 13"))]
2412               ["De-IDNA" gnus-summary-idna-message t]
2413               ["Morse decode" gnus-summary-morse-message t]
2414               ["Unix pipe..." gnus-summary-pipe-message t]
2415               ["Add buttons" gnus-article-add-buttons t]
2416               ["Add buttons to head" gnus-article-add-buttons-to-head t]
2417               ["Stop page breaking" gnus-summary-stop-page-breaking t]
2418               ["Verbose header" gnus-summary-verbose-headers t]
2419               ["Toggle header" gnus-summary-toggle-header t]
2420               ["Unfold headers" gnus-article-treat-unfold-headers t]
2421               ["Fold newsgroups" gnus-article-treat-fold-newsgroups t]
2422               ["Html" gnus-article-wash-html t]
2423               ["Unsplit URLs" gnus-article-unsplit-urls t]
2424               ["Verify X-PGP-Sig" gnus-article-verify-x-pgp-sig t]
2425               ["Decode HZ" gnus-article-decode-HZ t]
2426               ["ANSI sequences" gnus-article-treat-ansi-sequences t]
2427               ("(Outlook) Deuglify"
2428                ["Unwrap lines" gnus-article-outlook-unwrap-lines t]
2429                ["Repair attribution" gnus-article-outlook-repair-attribution t]
2430                ["Rearrange citation" gnus-article-outlook-rearrange-citation t]
2431                ["Full (Outlook) deuglify"
2432                 gnus-article-outlook-deuglify-article t])
2433               )
2434              ("Output"
2435               ["Save in default format..." gnus-summary-save-article
2436                ,@(if (featurep 'xemacs) '(t)
2437                    '(:help "Save article using default method"))]
2438               ["Save in file..." gnus-summary-save-article-file
2439                ,@(if (featurep 'xemacs) '(t)
2440                    '(:help "Save article in file"))]
2441               ["Save in Unix mail format..." gnus-summary-save-article-mail t]
2442               ["Save in MH folder..." gnus-summary-save-article-folder t]
2443               ["Save in VM folder..." gnus-summary-save-article-vm t]
2444               ["Save in RMAIL mbox..." gnus-summary-save-article-rmail t]
2445               ["Save body in file..." gnus-summary-save-article-body-file t]
2446               ["Pipe through a filter..." gnus-summary-pipe-output t]
2447               ["Add to SOUP packet" gnus-soup-add-article t]
2448               ["Print with Muttprint..." gnus-summary-muttprint t]
2449               ["Print" gnus-summary-print-article
2450                ,@(if (featurep 'xemacs) '(t)
2451                    '(:help "Generate and print a PostScript image"))])
2452              ("Copy, move,... (Backend)"
2453               ,@(if (featurep 'xemacs) nil
2454                   '(:help "Copying, moving, expiring articles..."))
2455               ["Respool article..." gnus-summary-respool-article t]
2456               ["Move article..." gnus-summary-move-article
2457                (gnus-check-backend-function
2458                 'request-move-article gnus-newsgroup-name)]
2459               ["Copy article..." gnus-summary-copy-article t]
2460               ["Crosspost article..." gnus-summary-crosspost-article
2461                (gnus-check-backend-function
2462                 'request-replace-article gnus-newsgroup-name)]
2463               ["Import file..." gnus-summary-import-article
2464                (gnus-check-backend-function
2465                 'request-accept-article gnus-newsgroup-name)]
2466               ["Create article..." gnus-summary-create-article
2467                (gnus-check-backend-function
2468                 'request-accept-article gnus-newsgroup-name)]
2469               ["Check if posted" gnus-summary-article-posted-p t]
2470               ["Edit article" gnus-summary-edit-article
2471                (not (gnus-group-read-only-p))]
2472               ["Delete article" gnus-summary-delete-article
2473                (gnus-check-backend-function
2474                 'request-expire-articles gnus-newsgroup-name)]
2475               ["Query respool" gnus-summary-respool-query t]
2476               ["Trace respool" gnus-summary-respool-trace t]
2477               ["Delete expirable articles" gnus-summary-expire-articles-now
2478                (gnus-check-backend-function
2479                 'request-expire-articles gnus-newsgroup-name)])
2480              ("Extract"
2481               ["Uudecode" gnus-uu-decode-uu
2482                ,@(if (featurep 'xemacs) '(t)
2483                    '(:help "Decode uuencoded article(s)"))]
2484               ["Uudecode and save" gnus-uu-decode-uu-and-save t]
2485               ["Unshar" gnus-uu-decode-unshar t]
2486               ["Unshar and save" gnus-uu-decode-unshar-and-save t]
2487               ["Save" gnus-uu-decode-save t]
2488               ["Binhex" gnus-uu-decode-binhex t]
2489               ["Postscript" gnus-uu-decode-postscript t]
2490               ["All MIME parts" gnus-summary-save-parts t])
2491              ("Cache"
2492               ["Enter article" gnus-cache-enter-article t]
2493               ["Remove article" gnus-cache-remove-article t])
2494              ["Translate" gnus-article-babel t]
2495              ["Select article buffer" gnus-summary-select-article-buffer t]
2496              ["Make article buffer sticky" gnus-sticky-article t]
2497              ["Enter digest buffer" gnus-summary-enter-digest-group t]
2498              ["Isearch article..." gnus-summary-isearch-article t]
2499              ["Beginning of the article" gnus-summary-beginning-of-article t]
2500              ["End of the article" gnus-summary-end-of-article t]
2501              ["Fetch parent of article" gnus-summary-refer-parent-article t]
2502              ["Fetch referenced articles" gnus-summary-refer-references t]
2503              ["Fetch current thread" gnus-summary-refer-thread t]
2504              ["Fetch article with id..." gnus-summary-refer-article t]
2505              ["Setup Mailing List Params" gnus-mailing-list-insinuate t]
2506              ["Redisplay" gnus-summary-show-article t]
2507              ["Raw article" gnus-summary-show-raw-article :keys "C-u g"])))
2508       (easy-menu-define
2509         gnus-summary-article-menu gnus-summary-mode-map ""
2510         (cons "Article" innards))
2511
2512       (if (not (keymapp gnus-summary-article-menu))
2513           (easy-menu-define
2514             gnus-article-commands-menu gnus-article-mode-map ""
2515             (cons "Commands" innards))
2516         ;; in Emacs, don't share menu.
2517         (setq gnus-article-commands-menu
2518               (copy-keymap gnus-summary-article-menu))
2519         (define-key gnus-article-mode-map [menu-bar commands]
2520           (cons "Commands" gnus-article-commands-menu))))
2521
2522     (easy-menu-define
2523       gnus-summary-thread-menu gnus-summary-mode-map ""
2524       '("Threads"
2525         ["Find all messages in thread" gnus-summary-refer-thread t]
2526         ["Toggle threading" gnus-summary-toggle-threads t]
2527         ["Hide threads" gnus-summary-hide-all-threads t]
2528         ["Show threads" gnus-summary-show-all-threads t]
2529         ["Hide thread" gnus-summary-hide-thread t]
2530         ["Show thread" gnus-summary-show-thread t]
2531         ["Go to next thread" gnus-summary-next-thread t]
2532         ["Go to previous thread" gnus-summary-prev-thread t]
2533         ["Go down thread" gnus-summary-down-thread t]
2534         ["Go up thread" gnus-summary-up-thread t]
2535         ["Top of thread" gnus-summary-top-thread t]
2536         ["Mark thread as read" gnus-summary-kill-thread t]
2537         ["Mark thread as expired" gnus-summary-expire-thread t]
2538         ["Lower thread score" gnus-summary-lower-thread t]
2539         ["Raise thread score" gnus-summary-raise-thread t]
2540         ["Rethread current" gnus-summary-rethread-current t]))
2541
2542     (easy-menu-define
2543       gnus-summary-post-menu gnus-summary-mode-map ""
2544       `("Post"
2545         ["Send a message (mail or news)" gnus-summary-post-news
2546          ,@(if (featurep 'xemacs) '(t)
2547              '(:help "Compose a new message (mail or news)"))]
2548         ["Followup" gnus-summary-followup
2549          ,@(if (featurep 'xemacs) '(t)
2550              '(:help "Post followup to this article"))]
2551         ["Followup and yank" gnus-summary-followup-with-original
2552          ,@(if (featurep 'xemacs) '(t)
2553              '(:help "Post followup to this article, quoting its contents"))]
2554         ["Supersede article" gnus-summary-supersede-article t]
2555         ["Cancel article" gnus-summary-cancel-article
2556          ,@(if (featurep 'xemacs) '(t)
2557              '(:help "Cancel an article you posted"))]
2558         ["Reply" gnus-summary-reply t]
2559         ["Reply and yank" gnus-summary-reply-with-original t]
2560         ["Wide reply" gnus-summary-wide-reply t]
2561         ["Wide reply and yank" gnus-summary-wide-reply-with-original
2562          ,@(if (featurep 'xemacs) '(t)
2563              '(:help "Mail a reply, quoting this article"))]
2564         ["Very wide reply" gnus-summary-very-wide-reply t]
2565         ["Very wide reply and yank" gnus-summary-very-wide-reply-with-original
2566          ,@(if (featurep 'xemacs) '(t)
2567              '(:help "Mail a very wide reply, quoting this article"))]
2568         ["Mail forward" gnus-summary-mail-forward t]
2569         ["Post forward" gnus-summary-post-forward t]
2570         ["Digest and mail" gnus-uu-digest-mail-forward t]
2571         ["Digest and post" gnus-uu-digest-post-forward t]
2572         ["Resend message" gnus-summary-resend-message t]
2573         ["Resend message edit" gnus-summary-resend-message-edit t]
2574         ["Send bounced mail" gnus-summary-resend-bounced-mail t]
2575         ["Send a mail" gnus-summary-mail-other-window t]
2576         ["Create a local message" gnus-summary-news-other-window t]
2577         ["Uuencode and post" gnus-uu-post-news
2578          ,@(if (featurep 'xemacs) '(t)
2579              '(:help "Post a uuencoded article"))]
2580         ["Followup via news" gnus-summary-followup-to-mail t]
2581         ["Followup via news and yank"
2582          gnus-summary-followup-to-mail-with-original t]
2583         ["Strip signature on reply"
2584          (lambda ()
2585            (interactive)
2586            (if (not (memq message-cite-function
2587                           '(message-cite-original-without-signature
2588                             message-cite-original)))
2589                ;; Stupid workaround for XEmacs not honoring :visible.
2590                (message "Can't toggle this value of `message-cite-function'")
2591              (setq message-cite-function
2592                    (if (eq message-cite-function
2593                            'message-cite-original-without-signature)
2594                        'message-cite-original
2595                      'message-cite-original-without-signature))))
2596          ;; XEmacs barfs on :visible.
2597          ,@(if (featurep 'xemacs) nil
2598              '(:visible (memq message-cite-function
2599                               '(message-cite-original-without-signature
2600                                 message-cite-original))))
2601          :style toggle
2602          :selected (eq message-cite-function
2603                        'message-cite-original-without-signature)
2604          ,@(if (featurep 'xemacs) nil
2605              '(:help "Strip signature from cited article when replying."))]
2606         ;;("Draft"
2607         ;;["Send" gnus-summary-send-draft t]
2608         ;;["Send bounced" gnus-resend-bounced-mail t])
2609         ))
2610
2611     (cond
2612      ((not (keymapp gnus-summary-post-menu))
2613       (setq gnus-article-post-menu gnus-summary-post-menu))
2614      ((not gnus-article-post-menu)
2615       ;; Don't share post menu.
2616       (setq gnus-article-post-menu
2617             (copy-keymap gnus-summary-post-menu))))
2618     (define-key gnus-article-mode-map [menu-bar post]
2619       (cons "Post" gnus-article-post-menu))
2620
2621     (easy-menu-define
2622       gnus-summary-misc-menu gnus-summary-mode-map ""
2623       `("Gnus"
2624         ("Mark Read"
2625          ["Mark as read" gnus-summary-mark-as-read-forward t]
2626          ["Mark same subject and select"
2627           gnus-summary-kill-same-subject-and-select t]
2628          ["Mark same subject" gnus-summary-kill-same-subject t]
2629          ["Catchup" gnus-summary-catchup
2630           ,@(if (featurep 'xemacs) '(t)
2631               '(:help "Mark unread articles in this group as read"))]
2632          ["Catchup all" gnus-summary-catchup-all t]
2633          ["Catchup to here" gnus-summary-catchup-to-here t]
2634          ["Catchup from here" gnus-summary-catchup-from-here t]
2635          ["Catchup region" gnus-summary-mark-region-as-read
2636           (gnus-mark-active-p)]
2637          ["Mark excluded" gnus-summary-limit-mark-excluded-as-read t])
2638         ("Mark Various"
2639          ["Tick" gnus-summary-tick-article-forward t]
2640          ["Mark as dormant" gnus-summary-mark-as-dormant t]
2641          ["Remove marks" gnus-summary-clear-mark-forward t]
2642          ["Set expirable mark" gnus-summary-mark-as-expirable t]
2643          ["Set bookmark" gnus-summary-set-bookmark t]
2644          ["Remove bookmark" gnus-summary-remove-bookmark t])
2645         ("Limit to"
2646          ["Marks..." gnus-summary-limit-to-marks t]
2647          ["Subject..." gnus-summary-limit-to-subject t]
2648          ["Author..." gnus-summary-limit-to-author t]
2649          ["Recipient..." gnus-summary-limit-to-recipient t]
2650          ["Address..." gnus-summary-limit-to-address t]
2651          ["Age..." gnus-summary-limit-to-age t]
2652          ["Extra..." gnus-summary-limit-to-extra t]
2653          ["Score..." gnus-summary-limit-to-score t]
2654          ["Display Predicate" gnus-summary-limit-to-display-predicate t]
2655          ["Unread" gnus-summary-limit-to-unread t]
2656          ["Unseen" gnus-summary-limit-to-unseen t]
2657          ["Singletons" gnus-summary-limit-to-singletons t]
2658          ["Replied" gnus-summary-limit-to-replied t]
2659          ["Non-dormant" gnus-summary-limit-exclude-dormant t]
2660          ["Next or process marked articles" gnus-summary-limit-to-articles t]
2661          ["Pop limit" gnus-summary-pop-limit t]
2662          ["Show dormant" gnus-summary-limit-include-dormant t]
2663          ["Hide childless dormant"
2664           gnus-summary-limit-exclude-childless-dormant t]
2665          ;;["Hide thread" gnus-summary-limit-exclude-thread t]
2666          ["Hide marked" gnus-summary-limit-exclude-marks t]
2667          ["Show expunged" gnus-summary-limit-include-expunged t])
2668         ("Process Mark"
2669          ["Set mark" gnus-summary-mark-as-processable t]
2670          ["Remove mark" gnus-summary-unmark-as-processable t]
2671          ["Remove all marks" gnus-summary-unmark-all-processable t]
2672          ["Invert marks" gnus-uu-invert-processable t]
2673          ["Mark above" gnus-uu-mark-over t]
2674          ["Mark series" gnus-uu-mark-series t]
2675          ["Mark region" gnus-uu-mark-region (gnus-mark-active-p)]
2676          ["Unmark region" gnus-uu-unmark-region (gnus-mark-active-p)]
2677          ["Mark by regexp..." gnus-uu-mark-by-regexp t]
2678          ["Unmark by regexp..." gnus-uu-unmark-by-regexp t]
2679          ["Mark all" gnus-uu-mark-all t]
2680          ["Mark buffer" gnus-uu-mark-buffer t]
2681          ["Mark sparse" gnus-uu-mark-sparse t]
2682          ["Mark thread" gnus-uu-mark-thread t]
2683          ["Unmark thread" gnus-uu-unmark-thread t]
2684          ("Process Mark Sets"
2685           ["Kill" gnus-summary-kill-process-mark t]
2686           ["Yank" gnus-summary-yank-process-mark
2687            gnus-newsgroup-process-stack]
2688           ["Save" gnus-summary-save-process-mark t]
2689           ["Run command on marked..." gnus-summary-universal-argument t]))
2690         ("Registry Marks")
2691         ("Scroll article"
2692          ["Page forward" gnus-summary-next-page
2693           ,@(if (featurep 'xemacs) '(t)
2694               '(:help "Show next page of article"))]
2695          ["Page backward" gnus-summary-prev-page
2696           ,@(if (featurep 'xemacs) '(t)
2697               '(:help "Show previous page of article"))]
2698          ["Line forward" gnus-summary-scroll-up t])
2699         ("Move"
2700          ["Next unread article" gnus-summary-next-unread-article t]
2701          ["Previous unread article" gnus-summary-prev-unread-article t]
2702          ["Next article" gnus-summary-next-article t]
2703          ["Previous article" gnus-summary-prev-article t]
2704          ["Next unread subject" gnus-summary-next-unread-subject t]
2705          ["Previous unread subject" gnus-summary-prev-unread-subject t]
2706          ["Next article same subject" gnus-summary-next-same-subject t]
2707          ["Previous article same subject" gnus-summary-prev-same-subject t]
2708          ["First unread article" gnus-summary-first-unread-article t]
2709          ["Best unread article" gnus-summary-best-unread-article t]
2710          ["Go to subject number..." gnus-summary-goto-subject t]
2711          ["Go to article number..." gnus-summary-goto-article t]
2712          ["Go to the last article" gnus-summary-goto-last-article t]
2713          ["Pop article off history" gnus-summary-pop-article t])
2714         ("Sort"
2715          ["Sort by number" gnus-summary-sort-by-number t]
2716          ["Sort by most recent number" gnus-summary-sort-by-most-recent-number t]
2717          ["Sort by author" gnus-summary-sort-by-author t]
2718          ["Sort by recipient" gnus-summary-sort-by-recipient t]
2719          ["Sort by subject" gnus-summary-sort-by-subject t]
2720          ["Sort by date" gnus-summary-sort-by-date t]
2721          ["Sort by most recent date" gnus-summary-sort-by-most-recent-date t]
2722          ["Sort by score" gnus-summary-sort-by-score t]
2723          ["Sort by lines" gnus-summary-sort-by-lines t]
2724          ["Sort by characters" gnus-summary-sort-by-chars t]
2725          ["Randomize" gnus-summary-sort-by-random t]
2726          ["Original sort" gnus-summary-sort-by-original t])
2727         ("Help"
2728          ["Fetch group FAQ" gnus-summary-fetch-faq t]
2729          ["Describe group" gnus-summary-describe-group t]
2730          ["Fetch charter" gnus-group-fetch-charter
2731           ,@(if (featurep 'xemacs) nil
2732               '(:help "Display the charter of the current group"))]
2733          ["Fetch control message" gnus-group-fetch-control
2734           ,@(if (featurep 'xemacs) nil
2735               '(:help "Display the archived control message for the current group"))]
2736          ["Read manual" gnus-info-find-node t])
2737         ("Modes"
2738          ["Pick and read" gnus-pick-mode t]
2739          ["Binary" gnus-binary-mode t])
2740         ("Regeneration"
2741          ["Regenerate" gnus-summary-prepare t]
2742          ["Insert cached articles" gnus-summary-insert-cached-articles t]
2743          ["Insert dormant articles" gnus-summary-insert-dormant-articles t]
2744          ["Insert ticked articles" gnus-summary-insert-ticked-articles t]
2745          ["Toggle threading" gnus-summary-toggle-threads t])
2746         ["See old articles" gnus-summary-insert-old-articles t]
2747         ["See new articles" gnus-summary-insert-new-articles t]
2748         ["Filter articles..." gnus-summary-execute-command t]
2749         ["Run command on articles..." gnus-summary-universal-argument t]
2750         ["Search articles forward..." gnus-summary-search-article-forward t]
2751         ["Search articles backward..." gnus-summary-search-article-backward t]
2752         ["Toggle line truncation" gnus-summary-toggle-truncation t]
2753         ["Expand window" gnus-summary-expand-window t]
2754         ["Expire expirable articles" gnus-summary-expire-articles
2755          (gnus-check-backend-function
2756           'request-expire-articles gnus-newsgroup-name)]
2757         ["Edit local kill file" gnus-summary-edit-local-kill t]
2758         ["Edit main kill file" gnus-summary-edit-global-kill t]
2759         ["Edit group parameters" gnus-summary-edit-parameters t]
2760         ["Customize group parameters" gnus-summary-customize-parameters t]
2761         ["Send a bug report" gnus-bug t]
2762         ("Exit"
2763          ["Catchup and exit" gnus-summary-catchup-and-exit
2764           ,@(if (featurep 'xemacs) '(t)
2765               '(:help "Mark unread articles in this group as read, then exit"))]
2766          ["Catchup all and exit" gnus-summary-catchup-all-and-exit t]
2767          ["Catchup and goto next" gnus-summary-catchup-and-goto-next-group t]
2768          ["Catchup and goto prev" gnus-summary-catchup-and-goto-prev-group t]
2769          ["Exit group" gnus-summary-exit
2770           ,@(if (featurep 'xemacs) '(t)
2771               '(:help "Exit current group, return to group selection mode"))]
2772          ["Exit group without updating" gnus-summary-exit-no-update t]
2773          ["Exit and goto next group" gnus-summary-next-group t]
2774          ["Exit and goto prev group" gnus-summary-prev-group t]
2775          ["Reselect group" gnus-summary-reselect-current-group t]
2776          ["Rescan group" gnus-summary-rescan-group t]
2777          ["Update dribble" gnus-summary-save-newsrc t])))
2778
2779     (gnus-run-hooks 'gnus-summary-menu-hook)))
2780
2781 (defvar gnus-summary-tool-bar-map nil)
2782
2783 ;; Note: The :set function in the `gnus-summary-tool-bar*' variables will only
2784 ;; affect _new_ message buffers.  We might add a function that walks thru all
2785 ;; summary-mode buffers and force the update.
2786 (defun gnus-summary-tool-bar-update (&optional symbol value)
2787   "Update summary mode toolbar.
2788 Setter function for custom variables."
2789   (setq-default gnus-summary-tool-bar-map nil)
2790   (when symbol
2791     ;; When used as ":set" function:
2792     (set-default symbol value))
2793   (when (gnus-buffer-live-p gnus-summary-buffer)
2794     (with-current-buffer gnus-summary-buffer
2795       (gnus-summary-make-tool-bar))))
2796
2797 (defcustom gnus-summary-tool-bar (if (eq gmm-tool-bar-style 'gnome)
2798                                      'gnus-summary-tool-bar-gnome
2799                                    'gnus-summary-tool-bar-retro)
2800   "Specifies the Gnus summary tool bar.
2801
2802 It can be either a list or a symbol refering to a list.  See
2803 `gmm-tool-bar-from-list' for the format of the list.  The
2804 default key map is `gnus-summary-mode-map'.
2805
2806 Pre-defined symbols include `gnus-summary-tool-bar-gnome' and
2807 `gnus-summary-tool-bar-retro'."
2808   :type '(choice (const :tag "GNOME style" gnus-summary-tool-bar-gnome)
2809                  (const :tag "Retro look"  gnus-summary-tool-bar-retro)
2810                  (repeat :tag "User defined list" gmm-tool-bar-item)
2811                  (symbol))
2812   :version "23.1" ;; No Gnus
2813   :initialize 'custom-initialize-default
2814   :set 'gnus-summary-tool-bar-update
2815   :group 'gnus-summary)
2816
2817 (defcustom gnus-summary-tool-bar-gnome
2818   '((gnus-summary-post-news "mail/compose" nil)
2819     (gnus-summary-insert-new-articles "mail/inbox" nil
2820                                       :visible (or (not gnus-agent)
2821                                                    gnus-plugged))
2822     (gnus-summary-reply-with-original "mail/reply")
2823     (gnus-summary-reply "mail/reply" nil :visible nil)
2824     (gnus-summary-followup-with-original "mail/reply-all")
2825     (gnus-summary-followup "mail/reply-all" nil :visible nil)
2826     (gnus-summary-mail-forward "mail/forward")
2827     (gnus-summary-save-article "mail/save")
2828     (gnus-summary-search-article-forward "search" nil :visible nil)
2829     (gnus-summary-print-article "print")
2830     (gnus-summary-tick-article-forward "flag-followup" nil :visible nil)
2831     ;; Some new commands that may need more suitable icons:
2832     (gnus-summary-save-newsrc "save" nil :visible nil)
2833     ;; (gnus-summary-show-article "stock_message-display" nil :visible nil)
2834     (gnus-summary-prev-article "left-arrow")
2835     (gnus-summary-next-article "right-arrow")
2836     (gnus-summary-next-page "next-page")
2837     ;; (gnus-summary-enter-digest-group "right_arrow" nil :visible nil)
2838     ;;
2839     ;; Maybe some sort-by-... could be added:
2840     ;; (gnus-summary-sort-by-author "sort-a-z" nil :visible nil)
2841     ;; (gnus-summary-sort-by-date "sort-1-9" nil :visible nil)
2842     (gnus-summary-mark-as-expirable
2843      "delete" nil
2844      :visible (gnus-check-backend-function 'request-expire-articles
2845                                            gnus-newsgroup-name))
2846     (gnus-summary-mark-as-spam
2847      "mail/spam" t
2848      :visible (and (fboundp 'spam-group-ham-contents-p)
2849                    (spam-group-ham-contents-p gnus-newsgroup-name))
2850      :help "Mark as spam")
2851     (gnus-summary-mark-as-read-forward
2852      "mail/not-spam" nil
2853      :visible (and (fboundp 'spam-group-spam-contents-p)
2854                    (spam-group-spam-contents-p gnus-newsgroup-name)))
2855     ;;
2856     (gnus-summary-exit "exit")
2857     (gmm-customize-mode "preferences" t :help "Edit mode preferences")
2858     (gnus-info-find-node "help"))
2859   "List of functions for the summary tool bar (GNOME style).
2860
2861 See `gmm-tool-bar-from-list' for the format of the list."
2862   :type '(repeat gmm-tool-bar-item)
2863   :version "23.1" ;; No Gnus
2864   :initialize 'custom-initialize-default
2865   :set 'gnus-summary-tool-bar-update
2866   :group 'gnus-summary)
2867
2868 (defcustom gnus-summary-tool-bar-retro
2869   '((gnus-summary-prev-unread-article "gnus/prev-ur")
2870     (gnus-summary-next-unread-article "gnus/next-ur")
2871     (gnus-summary-post-news "gnus/post")
2872     (gnus-summary-followup-with-original "gnus/fuwo")
2873     (gnus-summary-followup "gnus/followup")
2874     (gnus-summary-reply-with-original "gnus/reply-wo")
2875     (gnus-summary-reply "gnus/reply")
2876     (gnus-summary-caesar-message "gnus/rot13")
2877     (gnus-uu-decode-uu "gnus/uu-decode")
2878     (gnus-summary-save-article-file "gnus/save-aif")
2879     (gnus-summary-save-article "gnus/save-art")
2880     (gnus-uu-post-news "gnus/uu-post")
2881     (gnus-summary-catchup "gnus/catchup")
2882     (gnus-summary-catchup-and-exit "gnus/cu-exit")
2883     (gnus-summary-exit "gnus/exit-summ")
2884     ;; Some new command that may need more suitable icons:
2885     (gnus-summary-print-article "gnus/print" nil :visible nil)
2886     (gnus-summary-mark-as-expirable "gnus/close" nil :visible nil)
2887     (gnus-summary-save-newsrc "gnus/save" nil :visible nil)
2888     ;; (gnus-summary-enter-digest-group "gnus/right_arrow" nil :visible nil)
2889     (gnus-summary-search-article-forward "gnus/search" nil :visible nil)
2890     ;; (gnus-summary-insert-new-articles "gnus/paste" nil :visible nil)
2891     ;; (gnus-summary-toggle-threads "gnus/open" nil :visible nil)
2892     ;;
2893     (gnus-info-find-node "gnus/help" nil :visible nil))
2894   "List of functions for the summary tool bar (retro look).
2895
2896 See `gmm-tool-bar-from-list' for the format of the list."
2897   :type '(repeat gmm-tool-bar-item)
2898   :version "23.1" ;; No Gnus
2899   :initialize 'custom-initialize-default
2900   :set 'gnus-summary-tool-bar-update
2901   :group 'gnus-summary)
2902
2903 (defcustom gnus-summary-tool-bar-zap-list t
2904   "List of icon items from the global tool bar.
2905 These items are not displayed in the Gnus summary mode tool bar.
2906
2907 See `gmm-tool-bar-from-list' for the format of the list."
2908   :type 'gmm-tool-bar-zap-list
2909   :version "23.1" ;; No Gnus
2910   :initialize 'custom-initialize-default
2911   :set 'gnus-summary-tool-bar-update
2912   :group 'gnus-summary)
2913
2914 (defvar image-load-path)
2915 (defvar tool-bar-map)
2916
2917 (defun gnus-summary-make-tool-bar (&optional force)
2918   "Make a summary mode tool bar from `gnus-summary-tool-bar'.
2919 When FORCE, rebuild the tool bar."
2920   (when (and (not (featurep 'xemacs))
2921              (boundp 'tool-bar-mode)
2922              tool-bar-mode
2923              (or (not gnus-summary-tool-bar-map) force))
2924     (let* ((load-path
2925             (gmm-image-load-path-for-library "gnus"
2926                                              "mail/save.xpm"
2927                                              nil t))
2928            (image-load-path (cons (car load-path)
2929                                   (when (boundp 'image-load-path)
2930                                     image-load-path)))
2931            (map (gmm-tool-bar-from-list gnus-summary-tool-bar
2932                                         gnus-summary-tool-bar-zap-list
2933                                         'gnus-summary-mode-map)))
2934       (when map
2935         ;; Need to set `gnus-summary-tool-bar-map' because `gnus-article-mode'
2936         ;; uses it's value.
2937         (setq gnus-summary-tool-bar-map map))))
2938   (set (make-local-variable 'tool-bar-map) gnus-summary-tool-bar-map))
2939
2940 (defun gnus-score-set-default (var value)
2941   "A version of set that updates the GNU Emacs menu-bar."
2942   (set var value)
2943   ;; It is the message that forces the active status to be updated.
2944   (message ""))
2945
2946 (defun gnus-make-score-map (type)
2947   "Make a summary score map of type TYPE."
2948   (if t
2949       nil
2950     (let ((headers '(("author" "from" string)
2951                      ("subject" "subject" string)
2952                      ("article body" "body" string)
2953                      ("article head" "head" string)
2954                      ("xref" "xref" string)
2955                      ("extra header" "extra" string)
2956                      ("lines" "lines" number)
2957                      ("followups to author" "followup" string)))
2958           (types '((number ("less than" <)
2959                            ("greater than" >)
2960                            ("equal" =))
2961                    (string ("substring" s)
2962                            ("exact string" e)
2963                            ("fuzzy string" f)
2964                            ("regexp" r))))
2965           (perms '(("temporary" (current-time-string))
2966                    ("permanent" nil)
2967                    ("immediate" now)))
2968           header)
2969       (list
2970        (apply
2971         'nconc
2972         (list
2973          (if (eq type 'lower)
2974              "Lower score"
2975            "Increase score"))
2976         (let (outh)
2977           (while headers
2978             (setq header (car headers))
2979             (setq outh
2980                   (cons
2981                    (apply
2982                     'nconc
2983                     (list (car header))
2984                     (let ((ts (cdr (assoc (nth 2 header) types)))
2985                           outt)
2986                       (while ts
2987                         (setq outt
2988                               (cons
2989                                (apply
2990                                 'nconc
2991                                 (list (caar ts))
2992                                 (let ((ps perms)
2993                                       outp)
2994                                   (while ps
2995                                     (setq outp
2996                                           (cons
2997                                            (vector
2998                                             (caar ps)
2999                                             (list
3000                                              'gnus-summary-score-entry
3001                                              (nth 1 header)
3002                                              (if (or (string= (nth 1 header)
3003                                                               "head")
3004                                                      (string= (nth 1 header)
3005                                                               "body"))
3006                                                  ""
3007                                                (list 'gnus-summary-header
3008                                                      (nth 1 header)))
3009                                              (list 'quote (nth 1 (car ts)))
3010                                              (list 'gnus-score-delta-default
3011                                                    nil)
3012                                              (nth 1 (car ps))
3013                                              t)
3014                                             t)
3015                                            outp))
3016                                     (setq ps (cdr ps)))
3017                                   (list (nreverse outp))))
3018                                outt))
3019                         (setq ts (cdr ts)))
3020                       (list (nreverse outt))))
3021                    outh))
3022             (setq headers (cdr headers)))
3023           (list (nreverse outh))))))))
3024
3025
3026 (declare-function turn-on-gnus-mailing-list-mode "gnus-ml" ())
3027 (defvar bookmark-make-record-function)
3028 \f
3029
3030 (defun gnus-summary-mode (&optional group)
3031   "Major mode for reading articles.
3032
3033 All normal editing commands are switched off.
3034 \\<gnus-summary-mode-map>
3035 Each line in this buffer represents one article.  To read an
3036 article, you can, for instance, type `\\[gnus-summary-next-page]'.  To move forwards
3037 and backwards while displaying articles, type `\\[gnus-summary-next-unread-article]' and `\\[gnus-summary-prev-unread-article]',
3038 respectively.
3039
3040 You can also post articles and send mail from this buffer.  To
3041 follow up an article, type `\\[gnus-summary-followup]'.  To mail a reply to the author
3042 of an article, type `\\[gnus-summary-reply]'.
3043
3044 There are approx. one gazillion commands you can execute in this
3045 buffer; read the info pages for more information (`\\[gnus-info-find-node]').
3046
3047 The following commands are available:
3048
3049 \\{gnus-summary-mode-map}"
3050   (interactive)
3051   (kill-all-local-variables)
3052   (let ((gnus-summary-local-variables gnus-newsgroup-variables))
3053     (gnus-summary-make-local-variables))
3054   (gnus-summary-make-local-variables)
3055   (setq gnus-newsgroup-name group)
3056   (when (gnus-visual-p 'summary-menu 'menu)
3057     (gnus-summary-make-menu-bar)
3058     (gnus-summary-make-tool-bar))
3059   (gnus-make-thread-indent-array)
3060   (gnus-simplify-mode-line)
3061   (setq major-mode 'gnus-summary-mode)
3062   (setq mode-name "Summary")
3063   (use-local-map gnus-summary-mode-map)
3064   (buffer-disable-undo)
3065   (setq buffer-read-only t              ;Disable modification
3066         show-trailing-whitespace nil)
3067   (setq truncate-lines t)
3068   (add-to-invisibility-spec '(gnus-sum . t))
3069   (gnus-summary-set-display-table)
3070   (gnus-set-default-directory)
3071   (make-local-variable 'gnus-summary-line-format)
3072   (make-local-variable 'gnus-summary-line-format-spec)
3073   (make-local-variable 'gnus-summary-dummy-line-format)
3074   (make-local-variable 'gnus-summary-dummy-line-format-spec)
3075   (make-local-variable 'gnus-summary-mark-positions)
3076   (gnus-make-local-hook 'pre-command-hook)
3077   (add-hook 'pre-command-hook 'gnus-set-global-variables nil t)
3078   (gnus-run-mode-hooks 'gnus-summary-mode-hook)
3079   (turn-on-gnus-mailing-list-mode)
3080   (mm-enable-multibyte)
3081   (set (make-local-variable 'bookmark-make-record-function)
3082        'gnus-summary-bookmark-make-record)
3083   (gnus-update-format-specifications nil 'summary 'summary-mode 'summary-dummy)
3084   (gnus-update-summary-mark-positions))
3085
3086 (defun gnus-summary-make-local-variables ()
3087   "Make all the local summary buffer variables."
3088   (let (global)
3089     (dolist (local gnus-summary-local-variables)
3090       (if (consp local)
3091           (progn
3092             (if (eq (cdr local) 'global)
3093                 ;; Copy the global value of the variable.
3094                 (setq global (symbol-value (car local)))
3095               ;; Use the value from the list.
3096               (setq global (eval (cdr local))))
3097             (set (make-local-variable (car local)) global))
3098         ;; Simple nil-valued local variable.
3099         (set (make-local-variable local) nil)))))
3100
3101 (defun gnus-summary-clear-local-variables ()
3102   (let ((locals gnus-summary-local-variables))
3103     (while locals
3104       (if (consp (car locals))
3105           (and (symbolp (caar locals))
3106                (set (caar locals) nil))
3107         (and (symbolp (car locals))
3108              (set (car locals) nil)))
3109       (setq locals (cdr locals)))))
3110
3111 ;; Summary data functions.
3112
3113 (defmacro gnus-data-number (data)
3114   `(car ,data))
3115
3116 (defmacro gnus-data-set-number (data number)
3117   `(setcar ,data ,number))
3118
3119 (defmacro gnus-data-mark (data)
3120   `(nth 1 ,data))
3121
3122 (defmacro gnus-data-set-mark (data mark)
3123   `(setcar (nthcdr 1 ,data) ,mark))
3124
3125 (defmacro gnus-data-pos (data)
3126   `(nth 2 ,data))
3127
3128 (defmacro gnus-data-set-pos (data pos)
3129   `(setcar (nthcdr 2 ,data) ,pos))
3130
3131 (defmacro gnus-data-header (data)
3132   `(nth 3 ,data))
3133
3134 (defmacro gnus-data-set-header (data header)
3135   `(setf (nth 3 ,data) ,header))
3136
3137 (defmacro gnus-data-level (data)
3138   `(nth 4 ,data))
3139
3140 (defmacro gnus-data-unread-p (data)
3141   `(= (nth 1 ,data) gnus-unread-mark))
3142
3143 (defmacro gnus-data-read-p (data)
3144   `(/= (nth 1 ,data) gnus-unread-mark))
3145
3146 (defmacro gnus-data-pseudo-p (data)
3147   `(consp (nth 3 ,data)))
3148
3149 (defmacro gnus-data-find (number)
3150   `(assq ,number gnus-newsgroup-data))
3151
3152 (defmacro gnus-data-find-list (number &optional data)
3153   `(let ((bdata ,(or data 'gnus-newsgroup-data)))
3154      (memq (assq ,number bdata)
3155            bdata)))
3156
3157 (defmacro gnus-data-make (number mark pos header level)
3158   `(list ,number ,mark ,pos ,header ,level))
3159
3160 (defun gnus-data-enter (after-article number mark pos header level offset)
3161   (let ((data (gnus-data-find-list after-article)))
3162     (unless data
3163       (error "No such article: %d" after-article))
3164     (setcdr data (cons (gnus-data-make number mark pos header level)
3165                        (cdr data)))
3166     (setq gnus-newsgroup-data-reverse nil)
3167     (gnus-data-update-list (cddr data) offset)))
3168
3169 (defun gnus-data-enter-list (after-article list &optional offset)
3170   (when list
3171     (let ((data (and after-article (gnus-data-find-list after-article)))
3172           (ilist list))
3173       (if (not (or data
3174                    after-article))
3175           (let ((odata gnus-newsgroup-data))
3176             (setq gnus-newsgroup-data (nconc list gnus-newsgroup-data))
3177             (when offset
3178               (gnus-data-update-list odata offset)))
3179         ;; Find the last element in the list to be spliced into the main
3180         ;; list.
3181         (setq list (last list))
3182         (if (not data)
3183             (progn
3184               (setcdr list gnus-newsgroup-data)
3185               (setq gnus-newsgroup-data ilist)
3186               (when offset
3187                 (gnus-data-update-list (cdr list) offset)))
3188           (setcdr list (cdr data))
3189           (setcdr data ilist)
3190           (when offset
3191             (gnus-data-update-list (cdr list) offset))))
3192       (setq gnus-newsgroup-data-reverse nil))))
3193
3194 (defun gnus-data-remove (article &optional offset)
3195   (let ((data gnus-newsgroup-data))
3196     (if (= (gnus-data-number (car data)) article)
3197         (progn
3198           (setq gnus-newsgroup-data (cdr gnus-newsgroup-data)
3199                 gnus-newsgroup-data-reverse nil)
3200           (when offset
3201             (gnus-data-update-list gnus-newsgroup-data offset)))
3202       (while (cdr data)
3203         (when (= (gnus-data-number (cadr data)) article)
3204           (setcdr data (cddr data))
3205           (when offset
3206             (gnus-data-update-list (cdr data) offset))
3207           (setq data nil
3208                 gnus-newsgroup-data-reverse nil))
3209         (setq data (cdr data))))))
3210
3211 (defmacro gnus-data-list (backward)
3212   `(if ,backward
3213        (or gnus-newsgroup-data-reverse
3214            (setq gnus-newsgroup-data-reverse
3215                  (reverse gnus-newsgroup-data)))
3216      gnus-newsgroup-data))
3217
3218 (defun gnus-data-update-list (data offset)
3219   "Add OFFSET to the POS of all data entries in DATA."
3220   (setq gnus-newsgroup-data-reverse nil)
3221   (while data
3222     (setcar (nthcdr 2 (car data)) (+ offset (nth 2 (car data))))
3223     (setq data (cdr data))))
3224
3225 (defun gnus-summary-article-pseudo-p (article)
3226   "Say whether this article is a pseudo article or not."
3227   (not (vectorp (gnus-data-header (gnus-data-find article)))))
3228
3229 (defmacro gnus-summary-article-sparse-p (article)
3230   "Say whether this article is a sparse article or not."
3231   `(memq ,article gnus-newsgroup-sparse))
3232
3233 (defmacro gnus-summary-article-ancient-p (article)
3234   "Say whether this article is a sparse article or not."
3235   `(memq ,article gnus-newsgroup-ancient))
3236
3237 (defun gnus-article-parent-p (number)
3238   "Say whether this article is a parent or not."
3239   (let ((data (gnus-data-find-list number)))
3240     (and (cdr data)              ; There has to be an article after...
3241          (< (gnus-data-level (car data)) ; And it has to have a higher level.
3242             (gnus-data-level (nth 1 data))))))
3243
3244 (defun gnus-article-children (number)
3245   "Return a list of all children to NUMBER."
3246   (let* ((data (gnus-data-find-list number))
3247          (level (gnus-data-level (car data)))
3248          children)
3249     (setq data (cdr data))
3250     (while (and data
3251                 (= (gnus-data-level (car data)) (1+ level)))
3252       (push (gnus-data-number (car data)) children)
3253       (setq data (cdr data)))
3254     children))
3255
3256 (defmacro gnus-summary-skip-intangible ()
3257   "If the current article is intangible, then jump to a different article."
3258   '(let ((to (get-text-property (point) 'gnus-intangible)))
3259      (and to (gnus-summary-goto-subject to))))
3260
3261 (defmacro gnus-summary-article-intangible-p ()
3262   "Say whether this article is intangible or not."
3263   '(get-text-property (point) 'gnus-intangible))
3264
3265 (defun gnus-article-read-p (article)
3266   "Say whether ARTICLE is read or not."
3267   (not (or (memq article gnus-newsgroup-marked)
3268            (memq article gnus-newsgroup-spam-marked)
3269            (memq article gnus-newsgroup-unreads)
3270            (memq article gnus-newsgroup-unselected)
3271            (memq article gnus-newsgroup-dormant))))
3272
3273 ;; Some summary mode macros.
3274
3275 (defmacro gnus-summary-article-number ()
3276   "The article number of the article on the current line.
3277 If there isn't an article number here, then we return the current
3278 article number."
3279   '(progn
3280      (gnus-summary-skip-intangible)
3281      (or (get-text-property (point) 'gnus-number)
3282          (gnus-summary-last-subject))))
3283
3284 (defmacro gnus-summary-article-header (&optional number)
3285   "Return the header of article NUMBER."
3286   `(gnus-data-header (gnus-data-find
3287                       ,(or number '(gnus-summary-article-number)))))
3288
3289 (defmacro gnus-summary-thread-level (&optional number)
3290   "Return the level of thread that starts with article NUMBER."
3291   `(if (and (eq gnus-summary-make-false-root 'dummy)
3292             (get-text-property (point) 'gnus-intangible))
3293        0
3294      (gnus-data-level (gnus-data-find
3295                        ,(or number '(gnus-summary-article-number))))))
3296
3297 (defmacro gnus-summary-article-mark (&optional number)
3298   "Return the mark of article NUMBER."
3299   `(gnus-data-mark (gnus-data-find
3300                     ,(or number '(gnus-summary-article-number)))))
3301
3302 (defmacro gnus-summary-article-pos (&optional number)
3303   "Return the position of the line of article NUMBER."
3304   `(gnus-data-pos (gnus-data-find
3305                    ,(or number '(gnus-summary-article-number)))))
3306
3307 (defalias 'gnus-summary-subject-string 'gnus-summary-article-subject)
3308 (defmacro gnus-summary-article-subject (&optional number)
3309   "Return current subject string or nil if nothing."
3310   `(let ((headers
3311           ,(if number
3312                `(gnus-data-header (assq ,number gnus-newsgroup-data))
3313              '(gnus-data-header (assq (gnus-summary-article-number)
3314                                       gnus-newsgroup-data)))))
3315      (and headers
3316           (vectorp headers)
3317           (mail-header-subject headers))))
3318
3319 (defmacro gnus-summary-article-score (&optional number)
3320   "Return current article score."
3321   `(or (cdr (assq ,(or number '(gnus-summary-article-number))
3322                   gnus-newsgroup-scored))
3323        gnus-summary-default-score 0))
3324
3325 (defun gnus-summary-article-children (&optional number)
3326   "Return a list of article numbers that are children of article NUMBER."
3327   (let* ((data (gnus-data-find-list (or number (gnus-summary-article-number))))
3328          (level (gnus-data-level (car data)))
3329          l children)
3330     (while (and (setq data (cdr data))
3331                 (> (setq l (gnus-data-level (car data))) level))
3332       (and (= (1+ level) l)
3333            (push (gnus-data-number (car data))
3334                  children)))
3335     (nreverse children)))
3336
3337 (defun gnus-summary-article-parent (&optional number)
3338   "Return the article number of the parent of article NUMBER."
3339   (let* ((data (gnus-data-find-list (or number (gnus-summary-article-number))
3340                                     (gnus-data-list t)))
3341          (level (gnus-data-level (car data))))
3342     (if (zerop level)
3343         ()                              ; This is a root.
3344       ;; We search until we find an article with a level less than
3345       ;; this one.  That function has to be the parent.
3346       (while (and (setq data (cdr data))
3347                   (not (< (gnus-data-level (car data)) level))))
3348       (and data (gnus-data-number (car data))))))
3349
3350 (defun gnus-unread-mark-p (mark)
3351   "Say whether MARK is the unread mark."
3352   (= mark gnus-unread-mark))
3353
3354 (defun gnus-read-mark-p (mark)
3355   "Say whether MARK is one of the marks that mark as read.
3356 This is all marks except unread, ticked, dormant, and expirable."
3357   (not (or (= mark gnus-unread-mark)
3358            (= mark gnus-ticked-mark)
3359            (= mark gnus-spam-mark)
3360            (= mark gnus-dormant-mark)
3361            (= mark gnus-expirable-mark))))
3362
3363 (defmacro gnus-article-mark (number)
3364   "Return the MARK of article NUMBER.
3365 This macro should only be used when computing the mark the \"first\"
3366 time; i.e., when generating the summary lines.  After that,
3367 `gnus-summary-article-mark' should be used to examine the
3368 marks of articles."
3369   `(cond
3370     ((memq ,number gnus-newsgroup-unsendable) gnus-unsendable-mark)
3371     ((memq ,number gnus-newsgroup-downloadable) gnus-downloadable-mark)
3372     ((memq ,number gnus-newsgroup-unreads) gnus-unread-mark)
3373     ((memq ,number gnus-newsgroup-marked) gnus-ticked-mark)
3374     ((memq ,number gnus-newsgroup-spam-marked) gnus-spam-mark)
3375     ((memq ,number gnus-newsgroup-dormant) gnus-dormant-mark)
3376     ((memq ,number gnus-newsgroup-expirable) gnus-expirable-mark)
3377     (t (or (cdr (assq ,number gnus-newsgroup-reads))
3378            gnus-ancient-mark))))
3379
3380 ;; Saving hidden threads.
3381
3382 (defmacro gnus-save-hidden-threads (&rest forms)
3383   "Save hidden threads, eval FORMS, and restore the hidden threads."
3384   (let ((config (make-symbol "config")))
3385     `(let ((,config (gnus-hidden-threads-configuration)))
3386        (unwind-protect
3387            (save-excursion
3388              ,@forms)
3389          (gnus-restore-hidden-threads-configuration ,config)))))
3390 (put 'gnus-save-hidden-threads 'lisp-indent-function 0)
3391 (put 'gnus-save-hidden-threads 'edebug-form-spec '(body))
3392
3393 (defun gnus-data-compute-positions ()
3394   "Compute the positions of all articles."
3395   (setq gnus-newsgroup-data-reverse nil)
3396   (let ((data gnus-newsgroup-data))
3397     (save-excursion
3398       (gnus-save-hidden-threads
3399         (gnus-summary-show-all-threads)
3400         (goto-char (point-min))
3401         (while data
3402           (while (get-text-property (point) 'gnus-intangible)
3403             (forward-line 1))
3404           (gnus-data-set-pos (car data) (+ (point) 3))
3405           (setq data (cdr data))
3406           (forward-line 1))))))
3407
3408 (defun gnus-hidden-threads-configuration ()
3409   "Return the current hidden threads configuration."
3410   (save-excursion
3411     (let (config)
3412       (goto-char (point-min))
3413       (while (not (eobp))
3414         (when (eq (get-char-property (point-at-eol) 'invisible) 'gnus-sum)
3415           (push (save-excursion (forward-line 0) (point)) config))
3416         (forward-line 1))
3417       config)))
3418
3419 (defun gnus-restore-hidden-threads-configuration (config)
3420   "Restore hidden threads configuration from CONFIG."
3421   (save-excursion
3422     (let (point (inhibit-read-only t))
3423       (while (setq point (pop config))
3424         (goto-char point)
3425         (gnus-summary-hide-thread)))))
3426
3427 ;; Various summary mode internalish functions.
3428
3429 (defun gnus-mouse-pick-article (e)
3430   (interactive "e")
3431   (mouse-set-point e)
3432   (gnus-summary-next-page nil t))
3433
3434 (defun gnus-summary-set-display-table ()
3435   "Change the display table.
3436 Odd characters have a tendency to mess
3437 up nicely formatted displays - we make all possible glyphs
3438 display only a single character."
3439
3440   ;; We start from the standard display table, if any.
3441   (let ((table (or (copy-sequence standard-display-table)
3442                    (make-display-table)))
3443         (i 32))
3444     ;; Nix out all the control chars...
3445     (while (>= (setq i (1- i)) 0)
3446       (gnus-put-display-table i [??] table))
3447    ;; ... but not newline and cr, of course.  (cr is necessary for the
3448     ;; selective display).
3449     (gnus-put-display-table ?\n nil table)
3450     (gnus-put-display-table ?\r nil table)
3451     ;; We keep TAB as well.
3452     (gnus-put-display-table ?\t nil table)
3453     ;; We nix out any glyphs 127 through 255, or 127 through 159 in
3454     ;; Emacs 23 (unicode), that are not set already.
3455     (let ((i (if (ignore-errors (= (make-char 'latin-iso8859-1 160) 160))
3456                  160
3457                256)))
3458       (while (>= (setq i (1- i)) 127)
3459         ;; Only modify if the entry is nil.
3460         (unless (gnus-get-display-table i table)
3461           (gnus-put-display-table i [??] table))))
3462     (setq buffer-display-table table)))
3463
3464 (defun gnus-summary-set-article-display-arrow (pos)
3465   "Update the overlay arrow to point to line at position POS."
3466   (when gnus-summary-display-arrow
3467     (make-local-variable 'overlay-arrow-position)
3468     (make-local-variable 'overlay-arrow-string)
3469     (save-excursion
3470       (goto-char pos)
3471       (beginning-of-line)
3472       (unless overlay-arrow-position
3473         (setq overlay-arrow-position (make-marker)))
3474       (setq overlay-arrow-string "=>"
3475             overlay-arrow-position (set-marker overlay-arrow-position
3476                                                (point)
3477                                                (current-buffer))))))
3478
3479 (defun gnus-summary-setup-buffer (group)
3480   "Initialize summary buffer."
3481   (let ((buffer (gnus-summary-buffer-name group))
3482         (dead-name (concat "*Dead Summary "
3483                            (gnus-group-decoded-name group) "*")))
3484     ;; If a dead summary buffer exists, we kill it.
3485     (when (gnus-buffer-live-p dead-name)
3486       (gnus-kill-buffer dead-name))
3487     (if (get-buffer buffer)
3488         (progn
3489           (set-buffer buffer)
3490           (setq gnus-summary-buffer (current-buffer))
3491           (not gnus-newsgroup-prepared))
3492       ;; Fix by Sudish Joseph <joseph@cis.ohio-state.edu>
3493       (setq gnus-summary-buffer (set-buffer (gnus-get-buffer-create buffer)))
3494       (gnus-summary-mode group)
3495       (when gnus-carpal
3496         (gnus-carpal-setup-buffer 'summary))
3497       (when (gnus-group-quit-config group)
3498         (set (make-local-variable 'gnus-single-article-buffer) nil))
3499       (make-local-variable 'gnus-article-buffer)
3500       (make-local-variable 'gnus-article-current)
3501       (make-local-variable 'gnus-original-article-buffer)
3502       (setq gnus-newsgroup-name group)
3503       ;; Set any local variables in the group parameters.
3504       (gnus-summary-set-local-parameters gnus-newsgroup-name)
3505       t)))
3506
3507 (defun gnus-set-global-variables ()
3508   "Set the global equivalents of the buffer-local variables.
3509 They are set to the latest values they had.  These reflect the summary
3510 buffer that was in action when the last article was fetched."
3511   (when (eq major-mode 'gnus-summary-mode)
3512     (setq gnus-summary-buffer (current-buffer))
3513     (let ((name gnus-newsgroup-name)
3514           (marked gnus-newsgroup-marked)
3515           (spam gnus-newsgroup-spam-marked)
3516           (unread gnus-newsgroup-unreads)
3517           (headers gnus-current-headers)
3518           (data gnus-newsgroup-data)
3519           (summary gnus-summary-buffer)
3520           (article-buffer gnus-article-buffer)
3521           (original gnus-original-article-buffer)
3522           (gac gnus-article-current)
3523           (reffed gnus-reffed-article-number)
3524           (score-file gnus-current-score-file)
3525           (default-charset gnus-newsgroup-charset)
3526           vlist)
3527       (let ((locals gnus-newsgroup-variables))
3528         (while locals
3529           (if (consp (car locals))
3530               (push (eval (caar locals)) vlist)
3531             (push (eval (car locals)) vlist))
3532           (setq locals (cdr locals)))
3533         (setq vlist (nreverse vlist)))
3534       (with-current-buffer gnus-group-buffer
3535         (setq gnus-newsgroup-name name
3536               gnus-newsgroup-marked marked
3537               gnus-newsgroup-spam-marked spam
3538               gnus-newsgroup-unreads unread
3539               gnus-current-headers headers
3540               gnus-newsgroup-data data
3541               gnus-article-current gac
3542               gnus-summary-buffer summary
3543               gnus-article-buffer article-buffer
3544               gnus-original-article-buffer original
3545               gnus-reffed-article-number reffed
3546               gnus-current-score-file score-file
3547               gnus-newsgroup-charset default-charset)
3548         (let ((locals gnus-newsgroup-variables))
3549           (while locals
3550             (if (consp (car locals))
3551                 (set (caar locals) (pop vlist))
3552               (set (car locals) (pop vlist)))
3553             (setq locals (cdr locals))))
3554         ;; The article buffer also has local variables.
3555         (when (gnus-buffer-live-p gnus-article-buffer)
3556           (set-buffer gnus-article-buffer)
3557           (setq gnus-summary-buffer summary))))))
3558
3559 (defun gnus-summary-article-unread-p (article)
3560   "Say whether ARTICLE is unread or not."
3561   (memq article gnus-newsgroup-unreads))
3562
3563 (defun gnus-summary-first-article-p (&optional article)
3564   "Return whether ARTICLE is the first article in the buffer."
3565   (if (not (setq article (or article (gnus-summary-article-number))))
3566       nil
3567     (eq article (caar gnus-newsgroup-data))))
3568
3569 (defun gnus-summary-last-article-p (&optional article)
3570   "Return whether ARTICLE is the last article in the buffer."
3571   (if (not (setq article (or article (gnus-summary-article-number))))
3572       ;; All non-existent numbers are the last article.  :-)
3573       t
3574     (not (cdr (gnus-data-find-list article)))))
3575
3576 (defun gnus-make-thread-indent-array (&optional n)
3577   (when (or n
3578             (progn (setq n 200) nil)
3579             (null gnus-thread-indent-array)
3580             (/= gnus-thread-indent-level gnus-thread-indent-array-level))
3581     (setq gnus-thread-indent-array (make-vector (1+ n) "")
3582           gnus-thread-indent-array-level gnus-thread-indent-level)
3583     (while (>= n 0)
3584       (aset gnus-thread-indent-array n
3585             (make-string (* n gnus-thread-indent-level) ? ))
3586       (setq n (1- n)))))
3587
3588 (defun gnus-update-summary-mark-positions ()
3589   "Compute where the summary marks are to go."
3590   (save-excursion
3591     (when (gnus-buffer-exists-p gnus-summary-buffer)
3592       (set-buffer gnus-summary-buffer))
3593     (let ((spec gnus-summary-line-format-spec)
3594           pos)
3595       (save-excursion
3596         (gnus-set-work-buffer)
3597         (let ((gnus-tmp-unread ?Z)
3598               (gnus-replied-mark ?Z)
3599               (gnus-score-below-mark ?Z)
3600               (gnus-score-over-mark ?Z)
3601               (gnus-undownloaded-mark ?Z)
3602               (gnus-summary-line-format-spec spec)
3603               (gnus-newsgroup-downloadable '(0))
3604               (header [0 "" "" "05 Apr 2001 23:33:09 +0400" "" "" 0 0 "" nil])
3605               case-fold-search ignores)
3606           ;; Here, all marks are bound to Z.
3607           (gnus-summary-insert-line header
3608                                     0 nil t gnus-tmp-unread t nil "" nil 1)
3609           (goto-char (point-min))
3610           ;; Memorize the positions of the same characters as dummy marks.
3611           (while (re-search-forward "[A-D]" nil t)
3612             (push (point) ignores))
3613           (erase-buffer)
3614           ;; We use A-D as dummy marks in order to know column positions
3615           ;; where marks should be inserted.
3616           (setq gnus-tmp-unread ?A
3617                 gnus-replied-mark ?B
3618                 gnus-score-below-mark ?C
3619                 gnus-score-over-mark ?C
3620                 gnus-undownloaded-mark ?D)
3621           (gnus-summary-insert-line header
3622                                     0 nil t gnus-tmp-unread t nil "" nil 1)
3623           ;; Ignore characters which aren't dummy marks.
3624           (dolist (p ignores)
3625             (delete-region (goto-char (1- p)) p)
3626             (insert ?Z))
3627           (goto-char (point-min))
3628           (setq pos (list (cons 'unread
3629                                 (and (search-forward "A" nil t)
3630                                      (- (point) (point-min) 1)))))
3631           (goto-char (point-min))
3632           (push (cons 'replied (and (search-forward "B" nil t)
3633                                     (- (point) (point-min) 1)))
3634                 pos)
3635           (goto-char (point-min))
3636           (push (cons 'score (and (search-forward "C" nil t)
3637                                   (- (point) (point-min) 1)))
3638                 pos)
3639           (goto-char (point-min))
3640           (push (cons 'download (and (search-forward "D" nil t)
3641                                      (- (point) (point-min) 1)))
3642                 pos)))
3643       (setq gnus-summary-mark-positions pos))))
3644
3645 (defun gnus-summary-insert-dummy-line (gnus-tmp-subject gnus-tmp-number)
3646   "Insert a dummy root in the summary buffer."
3647   (beginning-of-line)
3648   (gnus-add-text-properties
3649    (point) (progn (eval gnus-summary-dummy-line-format-spec) (point))
3650    (list 'gnus-number gnus-tmp-number 'gnus-intangible gnus-tmp-number)))
3651
3652 (defun gnus-summary-extract-address-component (from)
3653   (or (car (funcall gnus-extract-address-components from))
3654       from))
3655
3656 (defun gnus-summary-from-or-to-or-newsgroups (header gnus-tmp-from)
3657   (let ((mail-parse-charset gnus-newsgroup-charset)
3658         (ignored-from-addresses (gnus-ignored-from-addresses))
3659         ; Is it really necessary to do this next part for each summary line?
3660         ; Luckily, doesn't seem to slow things down much.
3661         (mail-parse-ignored-charsets
3662          (with-current-buffer gnus-summary-buffer
3663            gnus-newsgroup-ignored-charsets)))
3664     (or
3665      (and ignored-from-addresses
3666           (string-match ignored-from-addresses gnus-tmp-from)
3667           (let ((extra-headers (mail-header-extra header))
3668                 to
3669                 newsgroups)
3670             (cond
3671              ((setq to (cdr (assq 'To extra-headers)))
3672               (concat gnus-summary-to-prefix
3673                       (inline
3674                         (gnus-summary-extract-address-component
3675                          (funcall gnus-decode-encoded-address-function to)))))
3676              ((setq newsgroups
3677                     (or
3678                      (cdr (assq 'Newsgroups extra-headers))
3679                      (and
3680                       (memq 'Newsgroups gnus-extra-headers)
3681                       (eq (car (gnus-find-method-for-group
3682                                 gnus-newsgroup-name)) 'nntp)
3683                       (gnus-group-real-name gnus-newsgroup-name))))
3684               (concat gnus-summary-newsgroup-prefix newsgroups)))))
3685      (inline (gnus-summary-extract-address-component gnus-tmp-from)))))
3686
3687 (defun gnus-summary-insert-line (gnus-tmp-header
3688                                  gnus-tmp-level gnus-tmp-current
3689                                  undownloaded gnus-tmp-unread gnus-tmp-replied
3690                                  gnus-tmp-expirable gnus-tmp-subject-or-nil
3691                                  &optional gnus-tmp-dummy gnus-tmp-score
3692                                  gnus-tmp-process)
3693   (if (>= gnus-tmp-level (length gnus-thread-indent-array))
3694       (gnus-make-thread-indent-array (max (* 2 (length gnus-thread-indent-array))
3695                                           gnus-tmp-level)))
3696   (let* ((gnus-tmp-indentation (aref gnus-thread-indent-array gnus-tmp-level))
3697          (gnus-tmp-lines (mail-header-lines gnus-tmp-header))
3698          (gnus-tmp-score (or gnus-tmp-score gnus-summary-default-score 0))
3699          (gnus-tmp-score-char
3700           (if (or (null gnus-summary-default-score)
3701                   (<= (abs (- gnus-tmp-score gnus-summary-default-score))
3702                       gnus-summary-zcore-fuzz))
3703               ?                         ;Whitespace
3704             (if (< gnus-tmp-score gnus-summary-default-score)
3705                 gnus-score-below-mark gnus-score-over-mark)))
3706          (gnus-tmp-number (mail-header-number gnus-tmp-header))
3707          (gnus-tmp-replied
3708           (cond (gnus-tmp-process gnus-process-mark)
3709                 ((memq gnus-tmp-current gnus-newsgroup-cached)
3710                  gnus-cached-mark)
3711                 (gnus-tmp-replied gnus-replied-mark)
3712                 ((memq gnus-tmp-current gnus-newsgroup-forwarded)
3713                  gnus-forwarded-mark)
3714                 ((memq gnus-tmp-current gnus-newsgroup-saved)
3715                  gnus-saved-mark)
3716                 ((memq gnus-tmp-number gnus-newsgroup-recent)
3717                  gnus-recent-mark)
3718                 ((memq gnus-tmp-number gnus-newsgroup-unseen)
3719                  gnus-unseen-mark)
3720                 (t gnus-no-mark)))
3721          (gnus-tmp-downloaded
3722           (cond (undownloaded
3723                  gnus-undownloaded-mark)
3724                 (gnus-newsgroup-agentized
3725                  gnus-downloaded-mark)
3726                 (t
3727                  gnus-no-mark)))
3728          (gnus-tmp-from (mail-header-from gnus-tmp-header))
3729          (gnus-tmp-name
3730           (cond
3731            ((string-match "<[^>]+> *$" gnus-tmp-from)
3732             (let ((beg (match-beginning 0)))
3733               (or (and (string-match "^\".+\"" gnus-tmp-from)
3734                        (substring gnus-tmp-from 1 (1- (match-end 0))))
3735                   (substring gnus-tmp-from 0 beg))))
3736            ((string-match "(.+)" gnus-tmp-from)
3737             (substring gnus-tmp-from
3738                        (1+ (match-beginning 0)) (1- (match-end 0))))
3739            (t gnus-tmp-from)))
3740          (gnus-tmp-subject (mail-header-subject gnus-tmp-header))
3741          (gnus-tmp-opening-bracket (if gnus-tmp-dummy ?\< ?\[))
3742          (gnus-tmp-closing-bracket (if gnus-tmp-dummy ?\> ?\]))
3743          (inhibit-read-only t))
3744     (when (string= gnus-tmp-name "")
3745       (setq gnus-tmp-name gnus-tmp-from))
3746     (unless (numberp gnus-tmp-lines)
3747       (setq gnus-tmp-lines -1))
3748     (if (= gnus-tmp-lines -1)
3749         (setq gnus-tmp-lines "?")
3750       (setq gnus-tmp-lines (number-to-string gnus-tmp-lines)))
3751     (condition-case ()
3752         (gnus-put-text-property
3753          (point)
3754          (progn (eval gnus-summary-line-format-spec) (point))
3755          'gnus-number gnus-tmp-number)
3756       (error (gnus-message 5 "Error updating the summary line")))
3757     (when (gnus-visual-p 'summary-highlight 'highlight)
3758       (forward-line -1)
3759       (gnus-run-hooks 'gnus-summary-update-hook)
3760       (forward-line 1))))
3761
3762 (defun gnus-summary-update-line (&optional dont-update)
3763   "Update summary line after change."
3764   (when (and gnus-summary-default-score
3765              (not gnus-summary-inhibit-highlight))
3766     (let* ((gnus-summary-inhibit-highlight t) ; Prevent recursion.
3767            (article (gnus-summary-article-number))
3768            (score (gnus-summary-article-score article)))
3769       (unless dont-update
3770         (if (and gnus-summary-mark-below
3771                  (< (gnus-summary-article-score)
3772                     gnus-summary-mark-below))
3773             ;; This article has a low score, so we mark it as read.
3774             (when (memq article gnus-newsgroup-unreads)
3775               (gnus-summary-mark-article-as-read gnus-low-score-mark))
3776           (when (eq (gnus-summary-article-mark) gnus-low-score-mark)
3777             ;; This article was previously marked as read on account
3778             ;; of a low score, but now it has risen, so we mark it as
3779             ;; unread.
3780             (gnus-summary-mark-article-as-unread gnus-unread-mark)))
3781         (gnus-summary-update-mark
3782          (if (or (null gnus-summary-default-score)
3783                  (<= (abs (- score gnus-summary-default-score))
3784                      gnus-summary-zcore-fuzz))
3785              ?                          ;Whitespace
3786            (if (< score gnus-summary-default-score)
3787                gnus-score-below-mark gnus-score-over-mark))
3788          'score))
3789       ;; Do visual highlighting.
3790       (when (gnus-visual-p 'summary-highlight 'highlight)
3791         (gnus-run-hooks 'gnus-summary-update-hook)))))
3792
3793 (defvar gnus-tmp-new-adopts nil)
3794
3795 (defun gnus-summary-number-of-articles-in-thread (thread &optional level char)
3796   "Return the number of articles in THREAD.
3797 This may be 0 in some cases -- if none of the articles in
3798 the thread are to be displayed."
3799   (let* ((number
3800          ;; Fix by Luc Van Eycken <Luc.VanEycken@esat.kuleuven.ac.be>.
3801           (cond
3802            ((not (listp thread))
3803             1)
3804            ((and (consp thread) (cdr thread))
3805             (apply
3806              '+ 1 (mapcar
3807                    'gnus-summary-number-of-articles-in-thread (cdr thread))))
3808            ((null thread)
3809             1)
3810            ((memq (mail-header-number (car thread)) gnus-newsgroup-limit)
3811             1)
3812            (t 0))))
3813     (when (and level (zerop level) gnus-tmp-new-adopts)
3814       (incf number
3815             (apply '+ (mapcar
3816                        'gnus-summary-number-of-articles-in-thread
3817                        gnus-tmp-new-adopts))))
3818     (if char
3819         (if (> number 1) gnus-not-empty-thread-mark
3820           gnus-empty-thread-mark)
3821       number)))
3822
3823 (defsubst gnus-summary-line-message-size (head)
3824   "Return pretty-printed version of message size.
3825 This function is intended to be used in
3826 `gnus-summary-line-format-alist'."
3827   (let ((c (or (mail-header-chars head) -1)))
3828     (cond ((< c 0) "n/a")               ; chars not available
3829           ((< c (* 1000 10)) (format "%1.1fk" (/ c 1024.0)))
3830           ((< c (* 1000 100)) (format "%dk" (/ c 1024.0)))
3831           ((< c (* 1000 10000)) (format "%1.1fM" (/ c (* 1024.0 1024))))
3832           (t (format "%dM" (/ c (* 1024.0 1024)))))))
3833
3834
3835 (defun gnus-summary-set-local-parameters (group)
3836   "Go through the local params of GROUP and set all variable specs in that list."
3837   (let ((vars '(quit-config)))          ; Ignore quit-config.
3838     (dolist (elem (gnus-group-find-parameter group))
3839       (and (consp elem)                 ; Has to be a cons.
3840            (consp (cdr elem))           ; The cdr has to be a list.
3841            (symbolp (car elem))         ; Has to be a symbol in there.
3842            (not (memq (car elem) vars))
3843            (ignore-errors
3844              (push (car elem) vars)
3845              ;; Variables like `gnus-show-threads' that are globally
3846              ;; bound, if used as group parameters, need to get to be
3847              ;; buffer-local, whereas just parameters like `gcc-self',
3848              ;; `timestamp', etc. should not be bound as variables.
3849              (if (boundp (car elem))
3850                  (set (make-local-variable (car elem)) (eval (nth 1 elem)))
3851                (eval (nth 1 elem))))))))
3852
3853 (defun gnus-summary-read-group (group &optional show-all no-article
3854                                       kill-buffer no-display backward
3855                                       select-articles)
3856   "Start reading news in newsgroup GROUP.
3857 If SHOW-ALL is non-nil, already read articles are also listed.
3858 If NO-ARTICLE is non-nil, no article is selected initially.
3859 If NO-DISPLAY, don't generate a summary buffer."
3860   (let (result)
3861     (while (and group
3862                 (null (setq result
3863                             (let ((gnus-auto-select-next nil))
3864                               (or (gnus-summary-read-group-1
3865                                    group show-all no-article
3866                                    kill-buffer no-display
3867                                    select-articles)
3868                                   (setq show-all nil
3869                                         select-articles nil)))))
3870                 (eq gnus-auto-select-next 'quietly))
3871       (set-buffer gnus-group-buffer)
3872       ;; The entry function called above goes to the next
3873       ;; group automatically, so we go two groups back
3874       ;; if we are searching for the previous group.
3875       (when backward
3876         (gnus-group-prev-unread-group 2))
3877       (if (not (equal group (gnus-group-group-name)))
3878           (setq group (gnus-group-group-name))
3879         (setq group nil)))
3880     result))
3881
3882 (defun gnus-summary-read-group-1 (group show-all no-article
3883                                         kill-buffer no-display
3884                                         &optional select-articles)
3885   ;; Killed foreign groups can't be entered.
3886   ;;  (when (and (not (gnus-group-native-p group))
3887   ;;         (not (gnus-gethash group gnus-newsrc-hashtb)))
3888   ;;    (error "Dead non-native groups can't be entered"))
3889   (gnus-message 5 "Retrieving newsgroup: %s..."
3890                 (gnus-group-decoded-name group))
3891   (let* ((new-group (gnus-summary-setup-buffer group))
3892          (quit-config (gnus-group-quit-config group))
3893          (did-select (and new-group (gnus-select-newsgroup
3894                                      group show-all select-articles))))
3895     (cond
3896      ;; This summary buffer exists already, so we just select it.
3897      ((not new-group)
3898       (gnus-set-global-variables)
3899       (when kill-buffer
3900         (gnus-kill-or-deaden-summary kill-buffer))
3901       (gnus-configure-windows 'summary 'force)
3902       (gnus-set-mode-line 'summary)
3903       (gnus-summary-position-point)
3904       (message "")
3905       t)
3906      ;; We couldn't select this group.
3907      ((null did-select)
3908       (when (and (eq major-mode 'gnus-summary-mode)
3909                  (not (equal (current-buffer) kill-buffer)))
3910         (kill-buffer (current-buffer))
3911         (if (not quit-config)
3912             (progn
3913               ;; Update the info -- marks might need to be removed,
3914               ;; for instance.
3915               (gnus-summary-update-info)
3916               (set-buffer gnus-group-buffer)
3917               (gnus-group-jump-to-group group)
3918               (gnus-group-next-unread-group 1))
3919           (gnus-handle-ephemeral-exit quit-config)))
3920       (let ((grpinfo (gnus-get-info group)))
3921         (if (null (gnus-info-read grpinfo))
3922             (gnus-message 3 "Group %s contains no messages"
3923                           (gnus-group-decoded-name group))
3924           (gnus-message 3 "Can't select group")))
3925       nil)
3926      ;; The user did a `C-g' while prompting for number of articles,
3927      ;; so we exit this group.
3928      ((eq did-select 'quit)
3929       (and (eq major-mode 'gnus-summary-mode)
3930            (not (equal (current-buffer) kill-buffer))
3931            (kill-buffer (current-buffer)))
3932       (when kill-buffer
3933         (gnus-kill-or-deaden-summary kill-buffer))
3934       (if (not quit-config)
3935           (progn
3936             (set-buffer gnus-group-buffer)
3937             (gnus-group-jump-to-group group)
3938             (gnus-configure-windows 'group 'force))
3939         (gnus-handle-ephemeral-exit quit-config))
3940       ;; Finally signal the quit.
3941       (signal 'quit nil))
3942      ;; The group was successfully selected.
3943      (t
3944       (gnus-set-global-variables)
3945       ;; Save the active value in effect when the group was entered.
3946       (setq gnus-newsgroup-active
3947             (gnus-copy-sequence
3948              (gnus-active gnus-newsgroup-name)))
3949       ;; You can change the summary buffer in some way with this hook.
3950       (gnus-run-hooks 'gnus-select-group-hook)
3951       (when (memq 'summary (gnus-update-format-specifications
3952                             nil 'summary 'summary-mode 'summary-dummy))
3953         ;; The format specification for the summary line was updated,
3954         ;; so we need to update the mark positions as well.
3955         (gnus-update-summary-mark-positions))
3956       ;; Do score processing.
3957       (when gnus-use-scoring
3958         (gnus-possibly-score-headers))
3959       ;; Check whether to fill in the gaps in the threads.
3960       (when gnus-build-sparse-threads
3961         (gnus-build-sparse-threads))
3962       ;; Find the initial limit.
3963       (if show-all
3964           (let ((gnus-newsgroup-dormant nil))
3965             (gnus-summary-initial-limit show-all))
3966         (gnus-summary-initial-limit show-all))
3967       ;; Generate the summary buffer.
3968       (unless no-display
3969         (gnus-summary-prepare))
3970       (when gnus-use-trees
3971         (gnus-tree-open group)
3972         (setq gnus-summary-highlight-line-function
3973               'gnus-tree-highlight-article))
3974       ;; If the summary buffer is empty, but there are some low-scored
3975       ;; articles or some excluded dormants, we include these in the
3976       ;; buffer.
3977       (when (and (zerop (buffer-size))
3978                  (not no-display))
3979         (cond (gnus-newsgroup-dormant
3980                (gnus-summary-limit-include-dormant))
3981               ((and gnus-newsgroup-scored show-all)
3982                (gnus-summary-limit-include-expunged t))))
3983       ;; Function `gnus-apply-kill-file' must be called in this hook.
3984       (gnus-run-hooks 'gnus-apply-kill-hook)
3985       (if (and (zerop (buffer-size))
3986                (not no-display))
3987           (progn
3988             ;; This newsgroup is empty.
3989             (gnus-summary-catchup-and-exit nil t)
3990             (gnus-message 6 "No unread news")
3991             (when kill-buffer
3992               (gnus-kill-or-deaden-summary kill-buffer))
3993             ;; Return nil from this function.
3994             nil)
3995         ;; Hide conversation thread subtrees.  We cannot do this in
3996         ;; gnus-summary-prepare-hook since kill processing may not
3997         ;; work with hidden articles.
3998         (gnus-summary-maybe-hide-threads)
3999         (when kill-buffer
4000           (gnus-kill-or-deaden-summary kill-buffer))
4001         (gnus-summary-auto-select-subject)
4002         ;; Show first unread article if requested.
4003         (if (and (not no-article)
4004                  (not no-display)
4005                  gnus-newsgroup-unreads
4006                  gnus-auto-select-first)
4007             (progn
4008               (gnus-configure-windows 'summary)
4009               (let ((art (gnus-summary-article-number)))
4010                 (unless (and (not gnus-plugged)
4011                              (or (memq art gnus-newsgroup-undownloaded)
4012                                  (memq art gnus-newsgroup-downloadable)))
4013                   (gnus-summary-goto-article art))))
4014           ;; Don't select any articles.
4015           (gnus-summary-position-point)
4016           (gnus-configure-windows 'summary 'force)
4017           (gnus-set-mode-line 'summary))
4018         (when (and gnus-auto-center-group
4019                    (get-buffer-window gnus-group-buffer t))
4020           ;; Gotta use windows, because recenter does weird stuff if
4021           ;; the current buffer ain't the displayed window.
4022           (let ((owin (selected-window)))
4023             (select-window (get-buffer-window gnus-group-buffer t))
4024             (when (gnus-group-goto-group group)
4025               (recenter))
4026             (select-window owin)))
4027         ;; Mark this buffer as "prepared".
4028         (setq gnus-newsgroup-prepared t)
4029         (gnus-run-hooks 'gnus-summary-prepared-hook)
4030         (unless (gnus-ephemeral-group-p group)
4031           (gnus-group-update-group group))
4032         t)))))
4033
4034 (defun gnus-summary-auto-select-subject ()
4035   "Select the subject line on initial group entry."
4036   (goto-char (point-min))
4037   (cond
4038    ((eq gnus-auto-select-subject 'best)
4039     (gnus-summary-best-unread-subject))
4040    ((eq gnus-auto-select-subject 'unread)
4041     (gnus-summary-first-unread-subject))
4042    ((eq gnus-auto-select-subject 'unseen)
4043     (gnus-summary-first-unseen-subject))
4044    ((eq gnus-auto-select-subject 'unseen-or-unread)
4045     (gnus-summary-first-unseen-or-unread-subject))
4046    ((eq gnus-auto-select-subject 'first)
4047     ;; Do nothing.
4048     )
4049    ((functionp gnus-auto-select-subject)
4050     (funcall gnus-auto-select-subject))))
4051
4052 (defun gnus-summary-prepare ()
4053   "Generate the summary buffer."
4054   (interactive)
4055   (let ((inhibit-read-only t))
4056     (erase-buffer)
4057     (setq gnus-newsgroup-data nil
4058           gnus-newsgroup-data-reverse nil)
4059     (gnus-run-hooks 'gnus-summary-generate-hook)
4060     ;; Generate the buffer, either with threads or without.
4061     (when gnus-newsgroup-headers
4062       (gnus-summary-prepare-threads
4063        (if gnus-show-threads
4064            (gnus-sort-gathered-threads
4065             (funcall gnus-summary-thread-gathering-function
4066                      (gnus-sort-threads
4067                       (gnus-cut-threads (gnus-make-threads)))))
4068          ;; Unthreaded display.
4069          (gnus-sort-articles gnus-newsgroup-headers))))
4070     (setq gnus-newsgroup-data (nreverse gnus-newsgroup-data))
4071     ;; Call hooks for modifying summary buffer.
4072     (goto-char (point-min))
4073     (gnus-run-hooks 'gnus-summary-prepare-hook)))
4074
4075 (defsubst gnus-general-simplify-subject (subject)
4076   "Simplify subject by the same rules as `gnus-gather-threads-by-subject'."
4077   (setq subject
4078         (cond
4079          ;; Truncate the subject.
4080          (gnus-simplify-subject-functions
4081           (gnus-map-function gnus-simplify-subject-functions subject))
4082          ((numberp gnus-summary-gather-subject-limit)
4083           (setq subject (gnus-simplify-subject-re subject))
4084           (if (> (length subject) gnus-summary-gather-subject-limit)
4085               (substring subject 0 gnus-summary-gather-subject-limit)
4086             subject))
4087          ;; Fuzzily simplify it.
4088          ((eq 'fuzzy gnus-summary-gather-subject-limit)
4089           (gnus-simplify-subject-fuzzy subject))
4090          ;; Just remove the leading "Re:".
4091          (t
4092           (gnus-simplify-subject-re subject))))
4093
4094   (if (and gnus-summary-gather-exclude-subject
4095            (string-match gnus-summary-gather-exclude-subject subject))
4096       nil                         ; This article shouldn't be gathered
4097     subject))
4098
4099 (defun gnus-summary-simplify-subject-query ()
4100   "Query where the respool algorithm would put this article."
4101   (interactive)
4102   (gnus-summary-select-article)
4103   (message "%s" (gnus-general-simplify-subject (gnus-summary-article-subject))))
4104
4105 (defun gnus-gather-threads-by-subject (threads)
4106   "Gather threads by looking at Subject headers."
4107   (if (not gnus-summary-make-false-root)
4108       threads
4109     (let ((hashtb (gnus-make-hashtable 1024))
4110           (prev threads)
4111           (result threads)
4112           subject hthread whole-subject)
4113       (while threads
4114         (setq subject (gnus-general-simplify-subject
4115                        (setq whole-subject (mail-header-subject
4116                                             (caar threads)))))
4117         (when subject
4118           (if (setq hthread (gnus-gethash subject hashtb))
4119               (progn
4120                 ;; We enter a dummy root into the thread, if we
4121                 ;; haven't done that already.
4122                 (unless (stringp (caar hthread))
4123                   (setcar hthread (list whole-subject (car hthread))))
4124                 ;; We add this new gathered thread to this gathered
4125                 ;; thread.
4126                 (setcdr (car hthread)
4127                         (nconc (cdar hthread) (list (car threads))))
4128                 ;; Remove it from the list of threads.
4129                 (setcdr prev (cdr threads))
4130                 (setq threads prev))
4131             ;; Enter this thread into the hash table.
4132             (gnus-sethash subject
4133                           (if gnus-summary-make-false-root-always
4134                               (progn
4135                                 ;; If you want a dummy root above all
4136                                 ;; threads...
4137                                 (setcar threads (list whole-subject
4138                                                       (car threads)))
4139                                 threads)
4140                             threads)
4141                           hashtb)))
4142         (setq prev threads)
4143         (setq threads (cdr threads)))
4144       result)))
4145
4146 (defun gnus-gather-threads-by-references (threads)
4147   "Gather threads by looking at References headers."
4148   (let ((idhashtb (gnus-make-hashtable 1024))
4149         (thhashtb (gnus-make-hashtable 1024))
4150         (prev threads)
4151         (result threads)
4152         ids references id gthread gid entered ref)
4153     (while threads
4154       (when (setq references (mail-header-references (caar threads)))
4155         (setq id (mail-header-id (caar threads))
4156               ids (inline (gnus-split-references references))
4157               entered nil)
4158         (while (setq ref (pop ids))
4159           (setq ids (delete ref ids))
4160           (if (not (setq gid (gnus-gethash ref idhashtb)))
4161               (progn
4162                 (gnus-sethash ref id idhashtb)
4163                 (gnus-sethash id threads thhashtb))
4164             (setq gthread (gnus-gethash gid thhashtb))
4165             (unless entered
4166               ;; We enter a dummy root into the thread, if we
4167               ;; haven't done that already.
4168               (unless (stringp (caar gthread))
4169                 (setcar gthread (list (mail-header-subject (caar gthread))
4170                                       (car gthread))))
4171               ;; We add this new gathered thread to this gathered
4172               ;; thread.
4173               (setcdr (car gthread)
4174                       (nconc (cdar gthread) (list (car threads)))))
4175             ;; Add it into the thread hash table.
4176             (gnus-sethash id gthread thhashtb)
4177             (setq entered t)
4178             ;; Remove it from the list of threads.
4179             (setcdr prev (cdr threads))
4180             (setq threads prev))))
4181       (setq prev threads)
4182       (setq threads (cdr threads)))
4183     result))
4184
4185 (defun gnus-sort-gathered-threads (threads)
4186   "Sort subtreads inside each gathered thread by `gnus-sort-gathered-threads-function'."
4187   (let ((result threads))
4188     (while threads
4189       (when (stringp (caar threads))
4190         (setcdr (car threads)
4191                 (sort (cdar threads) gnus-sort-gathered-threads-function)))
4192       (setq threads (cdr threads)))
4193     result))
4194
4195 (defun gnus-thread-loop-p (root thread)
4196   "Say whether ROOT is in THREAD."
4197   (let ((stack (list thread))
4198         (infloop 0)
4199         th)
4200     (while (setq thread (pop stack))
4201       (setq th (cdr thread))
4202       (while (and th
4203                   (not (eq (caar th) root)))
4204         (pop th))
4205       (if th
4206           ;; We have found a loop.
4207           (let (ref-dep)
4208             (setcdr thread (delq (car th) (cdr thread)))
4209             (if (boundp (setq ref-dep (intern "none"
4210                                               gnus-newsgroup-dependencies)))
4211                 (setcdr (symbol-value ref-dep)
4212                         (nconc (cdr (symbol-value ref-dep))
4213                                (list (car th))))
4214               (set ref-dep (list nil (car th))))
4215             (setq infloop 1
4216                   stack nil))
4217         ;; Push all the subthreads onto the stack.
4218         (push (cdr thread) stack)))
4219     infloop))
4220
4221 (defun gnus-make-threads ()
4222   "Go through the dependency hashtb and find the roots.  Return all threads."
4223   (let (threads)
4224     (while (catch 'infloop
4225              (mapatoms
4226               (lambda (refs)
4227                 ;; Deal with self-referencing References loops.
4228                 (when (and (car (symbol-value refs))
4229                            (not (zerop
4230                                  (apply
4231                                   '+
4232                                   (mapcar
4233                                    (lambda (thread)
4234                                      (gnus-thread-loop-p
4235                                       (car (symbol-value refs)) thread))
4236                                    (cdr (symbol-value refs)))))))
4237                   (setq threads nil)
4238                   (throw 'infloop t))
4239                 (unless (car (symbol-value refs))
4240                   ;; These threads do not refer back to any other
4241                   ;; articles, so they're roots.
4242                   (setq threads (append (cdr (symbol-value refs)) threads))))
4243               gnus-newsgroup-dependencies)))
4244     threads))
4245
4246 ;; Build the thread tree.
4247 (defsubst gnus-dependencies-add-header (header dependencies force-new)
4248   "Enter HEADER into the DEPENDENCIES table if it is not already there.
4249
4250 If FORCE-NEW is not nil, enter HEADER into the DEPENDENCIES table even
4251 if it was already present.
4252
4253 If `gnus-summary-ignore-duplicates' is nil then duplicate Message-IDs
4254 will not be entered in the DEPENDENCIES table.  Otherwise duplicate
4255 Message-IDs will be renamed to a unique Message-ID before being
4256 entered.
4257
4258 Returns HEADER if it was entered in the DEPENDENCIES.  Returns nil otherwise."
4259   (let* ((id (mail-header-id header))
4260          (id-dep (and id (intern id dependencies)))
4261          parent-id ref ref-dep ref-header replaced)
4262     ;; Enter this `header' in the `dependencies' table.
4263     (cond
4264      ((not id-dep)
4265       (setq header nil))
4266      ;; The first two cases do the normal part: enter a new `header'
4267      ;; in the `dependencies' table.
4268      ((not (boundp id-dep))
4269       (set id-dep (list header)))
4270      ((null (car (symbol-value id-dep)))
4271       (setcar (symbol-value id-dep) header))
4272
4273      ;; From here the `header' was already present in the
4274      ;; `dependencies' table.
4275      (force-new
4276       ;; Overrides an existing entry;
4277       ;; just set the header part of the entry.
4278       (setcar (symbol-value id-dep) header)
4279       (setq replaced t))
4280
4281      ;; Renames the existing `header' to a unique Message-ID.
4282      ((not gnus-summary-ignore-duplicates)
4283       ;; An article with this Message-ID has already been seen.
4284       ;; We rename the Message-ID.
4285       (set (setq id-dep (intern (setq id (nnmail-message-id)) dependencies))
4286            (list header))
4287       (mail-header-set-id header id))
4288
4289      ;; The last case ignores an existing entry, except it adds any
4290      ;; additional Xrefs (in case the two articles came from different
4291      ;; servers.
4292      ;; Also sets `header' to `nil' meaning that the `dependencies'
4293      ;; table was *not* modified.
4294      (t
4295       (mail-header-set-xref
4296        (car (symbol-value id-dep))
4297        (concat (or (mail-header-xref (car (symbol-value id-dep)))
4298                    "")
4299                (or (mail-header-xref header) "")))
4300       (setq header nil)))
4301
4302     (when (and header (not replaced))
4303       ;; First check that we are not creating a References loop.
4304       (setq parent-id (gnus-parent-id (mail-header-references header)))
4305       (setq ref parent-id)
4306       (while (and ref
4307                   (setq ref-dep (intern-soft ref dependencies))
4308                   (boundp ref-dep)
4309                   (setq ref-header (car (symbol-value ref-dep))))
4310         (if (string= id ref)
4311             ;; Yuk!  This is a reference loop.  Make the article be a
4312             ;; root article.
4313             (progn
4314               (mail-header-set-references (car (symbol-value id-dep)) "none")
4315               (setq ref nil)
4316               (setq parent-id nil))
4317           (setq ref (gnus-parent-id (mail-header-references ref-header)))))
4318       (setq ref-dep (intern (or parent-id "none") dependencies))
4319       (if (boundp ref-dep)
4320           (setcdr (symbol-value ref-dep)
4321                   (nconc (cdr (symbol-value ref-dep))
4322                          (list (symbol-value id-dep))))
4323         (set ref-dep (list nil (symbol-value id-dep)))))
4324     header))
4325
4326 (defun gnus-extract-message-id-from-in-reply-to (string)
4327   (if (string-match "<[^>]+>" string)
4328       (substring string (match-beginning 0) (match-end 0))
4329     nil))
4330
4331 (defun gnus-build-sparse-threads ()
4332   (let ((headers gnus-newsgroup-headers)
4333         (mail-parse-charset gnus-newsgroup-charset)
4334         (gnus-summary-ignore-duplicates t)
4335         header references generation relations
4336         subject child end new-child date)
4337     ;; First we create an alist of generations/relations, where
4338     ;; generations is how much we trust the relation, and the relation
4339     ;; is parent/child.
4340     (gnus-message 7 "Making sparse threads...")
4341     (save-excursion
4342       (nnheader-set-temp-buffer " *gnus sparse threads*")
4343       (while (setq header (pop headers))
4344         (when (and (setq references (mail-header-references header))
4345                    (not (string= references "")))
4346           (insert references)
4347           (setq child (mail-header-id header)
4348                 subject (mail-header-subject header)
4349                 date (mail-header-date header)
4350                 generation 0)
4351           (while (search-backward ">" nil t)
4352             (setq end (1+ (point)))
4353             (when (search-backward "<" nil t)
4354               (setq new-child (buffer-substring (point) end))
4355               (push (list (incf generation)
4356                           child (setq child new-child)
4357                           subject date)
4358                     relations)))
4359           (when child
4360             (push (list (1+ generation) child nil subject) relations))
4361           (erase-buffer)))
4362       (kill-buffer (current-buffer)))
4363     ;; Sort over trustworthiness.
4364     (dolist (relation (sort relations 'car-less-than-car))
4365       (when (gnus-dependencies-add-header
4366              (make-full-mail-header
4367               gnus-reffed-article-number
4368               (nth 3 relation) "" (or (nth 4 relation) "")
4369               (nth 1 relation)
4370               (or (nth 2 relation) "") 0 0 "")
4371              gnus-newsgroup-dependencies nil)
4372         (push gnus-reffed-article-number gnus-newsgroup-limit)
4373         (push gnus-reffed-article-number gnus-newsgroup-sparse)
4374         (push (cons gnus-reffed-article-number gnus-sparse-mark)
4375               gnus-newsgroup-reads)
4376         (decf gnus-reffed-article-number)))
4377     (gnus-message 7 "Making sparse threads...done")))
4378
4379 (defun gnus-build-old-threads ()
4380   ;; Look at all the articles that refer back to old articles, and
4381   ;; fetch the headers for the articles that aren't there.  This will
4382   ;; build complete threads - if the roots haven't been expired by the
4383   ;; server, that is.
4384   (let ((mail-parse-charset gnus-newsgroup-charset)
4385         id heads)
4386     (mapatoms
4387      (lambda (refs)
4388        (when (not (car (symbol-value refs)))
4389          (setq heads (cdr (symbol-value refs)))
4390          (while heads
4391            (if (memq (mail-header-number (caar heads))
4392                      gnus-newsgroup-dormant)
4393                (setq heads (cdr heads))
4394              (setq id (symbol-name refs))
4395              (while (and (setq id (gnus-build-get-header id))
4396                          (not (car (gnus-id-to-thread id)))))
4397              (setq heads nil)))))
4398      gnus-newsgroup-dependencies)))
4399
4400 (defsubst gnus-remove-odd-characters (string)
4401   "Translate STRING into something that doesn't contain weird characters."
4402   (mm-subst-char-in-string
4403    ?\r ?\-
4404    (mm-subst-char-in-string ?\n ?\- string t) t))
4405
4406 ;; This function has to be called with point after the article number
4407 ;; on the beginning of the line.
4408 (defsubst gnus-nov-parse-line (number dependencies &optional force-new)
4409   (let ((eol (point-at-eol))
4410         (buffer (current-buffer))
4411         header references in-reply-to)
4412
4413     ;; overview: [num subject from date id refs chars lines misc]
4414     (unwind-protect
4415         (let (x)
4416           (narrow-to-region (point) eol)
4417           (unless (eobp)
4418             (forward-char))
4419
4420           (setq header
4421                 (make-full-mail-header
4422                  number                 ; number
4423                  (condition-case ()     ; subject
4424                      (gnus-remove-odd-characters
4425                       (funcall gnus-decode-encoded-word-function
4426                                (setq x (nnheader-nov-field))))
4427                    (error x))
4428                  (condition-case ()     ; from
4429                      (gnus-remove-odd-characters
4430                       (funcall gnus-decode-encoded-address-function
4431                                (setq x (nnheader-nov-field))))
4432                    (error x))
4433                  (nnheader-nov-field)   ; date
4434                  (nnheader-nov-read-message-id number)  ; id
4435                  (setq references (nnheader-nov-field)) ; refs
4436                  (nnheader-nov-read-integer) ; chars
4437                  (nnheader-nov-read-integer) ; lines
4438                  (unless (eobp)
4439                    (if (looking-at "Xref: ")
4440                        (goto-char (match-end 0)))
4441                    (nnheader-nov-field)) ; Xref
4442                  (nnheader-nov-parse-extra)))) ; extra
4443
4444       (widen))
4445
4446     (when (and (string= references "")
4447                (setq in-reply-to (mail-header-extra header))
4448                (setq in-reply-to (cdr (assq 'In-Reply-To in-reply-to))))
4449       (mail-header-set-references
4450        header (gnus-extract-message-id-from-in-reply-to in-reply-to)))
4451
4452     (when gnus-alter-header-function
4453       (funcall gnus-alter-header-function header))
4454     (gnus-dependencies-add-header header dependencies force-new)))
4455
4456 (defun gnus-build-get-header (id)
4457   "Look through the buffer of NOV lines and find the header to ID.
4458 Enter this line into the dependencies hash table, and return
4459 the id of the parent article (if any)."
4460   (let ((deps gnus-newsgroup-dependencies)
4461         found header)
4462     (prog1
4463         (with-current-buffer nntp-server-buffer
4464           (let ((case-fold-search nil))
4465             (goto-char (point-min))
4466             (while (and (not found)
4467                         (search-forward id nil t))
4468               (beginning-of-line)
4469               (setq found (looking-at
4470                            (format "^[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t%s"
4471                                    (regexp-quote id))))
4472               (or found (beginning-of-line 2)))
4473             (when found
4474               (beginning-of-line)
4475               (and
4476                (setq header (gnus-nov-parse-line
4477                              (read (current-buffer)) deps))
4478                (gnus-parent-id (mail-header-references header))))))
4479       (when header
4480         (let ((number (mail-header-number header)))
4481           (push number gnus-newsgroup-limit)
4482           (push header gnus-newsgroup-headers)
4483           (if (memq number gnus-newsgroup-unselected)
4484               (progn
4485                 (setq gnus-newsgroup-unreads
4486                       (gnus-add-to-sorted-list gnus-newsgroup-unreads
4487                                                number))
4488                 (setq gnus-newsgroup-unselected
4489                       (delq number gnus-newsgroup-unselected)))
4490             (push number gnus-newsgroup-ancient)))))))
4491
4492 (defun gnus-build-all-threads ()
4493   "Read all the headers."
4494   (let ((gnus-summary-ignore-duplicates t)
4495         (mail-parse-charset gnus-newsgroup-charset)
4496         (dependencies gnus-newsgroup-dependencies)
4497         header article)
4498     (with-current-buffer nntp-server-buffer
4499       (let ((case-fold-search nil))
4500         (goto-char (point-min))
4501         (while (not (eobp))
4502           (ignore-errors
4503             (setq article (read (current-buffer))
4504                   header (gnus-nov-parse-line article dependencies)))
4505           (when header
4506             (with-current-buffer gnus-summary-buffer
4507               (push header gnus-newsgroup-headers)
4508               (if (memq (setq article (mail-header-number header))
4509                         gnus-newsgroup-unselected)
4510                   (progn
4511                     (setq gnus-newsgroup-unreads
4512                           (gnus-add-to-sorted-list
4513                            gnus-newsgroup-unreads article))
4514                     (setq gnus-newsgroup-unselected
4515                           (delq article gnus-newsgroup-unselected)))
4516                 (push article gnus-newsgroup-ancient)))
4517             (forward-line 1)))))))
4518
4519 (defun gnus-summary-update-article-line (article header)
4520   "Update the line for ARTICLE using HEADER."
4521   (let* ((id (mail-header-id header))
4522          (thread (gnus-id-to-thread id)))
4523     (unless thread
4524       (error "Article in no thread"))
4525     ;; Update the thread.
4526     (setcar thread header)
4527     (gnus-summary-goto-subject article)
4528     (let* ((datal (gnus-data-find-list article))
4529            (data (car datal))
4530            (inhibit-read-only t)
4531            (level (gnus-summary-thread-level)))
4532       (gnus-delete-line)
4533       (let ((inserted (- (point)
4534                          (progn
4535                            (gnus-summary-insert-line
4536                             header level nil
4537                             (memq article gnus-newsgroup-undownloaded)
4538                             (gnus-article-mark article)
4539                             (memq article gnus-newsgroup-replied)
4540                             (memq article gnus-newsgroup-expirable)
4541                             ;; Only insert the Subject string when it's different
4542                             ;; from the previous Subject string.
4543                             (if (and
4544                                  gnus-show-threads
4545                                  (gnus-subject-equal
4546                                   (condition-case ()
4547                                       (mail-header-subject
4548                                        (gnus-data-header
4549                                         (cadr
4550                                          (gnus-data-find-list
4551                                           article
4552                                           (gnus-data-list t)))))
4553                                     ;; Error on the side of excessive subjects.
4554                                     (error ""))
4555                                   (mail-header-subject header)))
4556                                 ""
4557                               (mail-header-subject header))
4558                             nil (cdr (assq article gnus-newsgroup-scored))
4559                             (memq article gnus-newsgroup-processable))
4560                            (point)))))
4561         (when (cdr datal)
4562           (gnus-data-update-list
4563            (cdr datal)
4564            (- (gnus-data-pos data) (gnus-data-pos (cadr datal)) inserted)))))))
4565
4566 (defun gnus-summary-update-article (article &optional iheader)
4567   "Update ARTICLE in the summary buffer."
4568   (set-buffer gnus-summary-buffer)
4569   (let* ((header (gnus-summary-article-header article))
4570          (id (mail-header-id header))
4571          (data (gnus-data-find article))
4572          (thread (gnus-id-to-thread id))
4573          (references (mail-header-references header))
4574          (parent
4575           (gnus-id-to-thread
4576            (or (gnus-parent-id
4577                 (when (and references
4578                            (not (equal "" references)))
4579                   references))
4580                "none")))
4581          (inhibit-read-only t)
4582          (old (car thread)))
4583     (when thread
4584       (unless iheader
4585         (setcar thread nil)
4586         (when parent
4587           (delq thread parent)))
4588       (if (gnus-summary-insert-subject id header)
4589           ;; Set the (possibly) new article number in the data structure.
4590           (gnus-data-set-number data (gnus-id-to-article id))
4591         (setcar thread old)
4592         nil))))
4593
4594 (defun gnus-rebuild-thread (id &optional line)
4595   "Rebuild the thread containing ID.
4596 If LINE, insert the rebuilt thread starting on line LINE."
4597   (let ((inhibit-read-only t)
4598         old-pos current thread data)
4599     (if (not gnus-show-threads)
4600         (setq thread (list (car (gnus-id-to-thread id))))
4601       ;; Get the thread this article is part of.
4602       (setq thread (gnus-remove-thread id)))
4603     (setq old-pos (point-at-bol))
4604     (setq current (save-excursion
4605                     (and (re-search-backward "[\r\n]" nil t)
4606                          (gnus-summary-article-number))))
4607     ;; If this is a gathered thread, we have to go some re-gathering.
4608     (when (stringp (car thread))
4609       (let ((subject (car thread))
4610             roots thr)
4611         (setq thread (cdr thread))
4612         (while thread
4613           (unless (memq (setq thr (gnus-id-to-thread
4614                                    (gnus-root-id
4615                                     (mail-header-id (caar thread)))))
4616                         roots)
4617             (push thr roots))
4618           (setq thread (cdr thread)))
4619         ;; We now have all (unique) roots.
4620         (if (= (length roots) 1)
4621             ;; All the loose roots are now one solid root.
4622             (setq thread (car roots))
4623           (setq thread (cons subject (gnus-sort-threads roots))))))
4624     (let (threads)
4625       ;; We then insert this thread into the summary buffer.
4626       (when line
4627         (goto-char (point-min))
4628         (forward-line (1- line)))
4629       (let (gnus-newsgroup-data gnus-newsgroup-threads)
4630         (if gnus-show-threads
4631             (gnus-summary-prepare-threads (gnus-cut-threads (list thread)))
4632           (gnus-summary-prepare-unthreaded thread))
4633         (setq data (nreverse gnus-newsgroup-data))
4634         (setq threads gnus-newsgroup-threads))
4635       ;; We splice the new data into the data structure.
4636       ;;!!! This is kinda bogus.  We assume that in LINE is non-nil,
4637       ;;!!! then we want to insert at the beginning of the buffer.
4638       ;;!!! That happens to be true with Gnus now, but that may
4639       ;;!!! change in the future.  Perhaps.
4640       (gnus-data-enter-list
4641        (if line nil current) data (- (point) old-pos))
4642       (setq gnus-newsgroup-threads
4643             (nconc threads gnus-newsgroup-threads))
4644       (gnus-data-compute-positions))))
4645
4646 (defun gnus-number-to-header (number)
4647   "Return the header for article NUMBER."
4648   (let ((headers gnus-newsgroup-headers))
4649     (while (and headers
4650                 (not (= number (mail-header-number (car headers)))))
4651       (pop headers))
4652     (when headers
4653       (car headers))))
4654
4655 (defun gnus-parent-headers (in-headers &optional generation)
4656   "Return the headers of the GENERATIONeth parent of HEADERS."
4657   (unless generation
4658     (setq generation 1))
4659   (let ((parent t)
4660         (headers in-headers)
4661         references)
4662     (while (and parent
4663                 (not (zerop generation))
4664                 (setq references (mail-header-references headers)))
4665       (setq headers (if (and references
4666                              (setq parent (gnus-parent-id references)))
4667                         (car (gnus-id-to-thread parent))
4668                       nil))
4669       (decf generation))
4670     (and (not (eq headers in-headers))
4671          headers)))
4672
4673 (defun gnus-id-to-thread (id)
4674   "Return the (sub-)thread where ID appears."
4675   (gnus-gethash id gnus-newsgroup-dependencies))
4676
4677 (defun gnus-id-to-article (id)
4678   "Return the article number of ID."
4679   (let ((thread (gnus-id-to-thread id)))
4680     (when (and thread
4681                (car thread))
4682       (mail-header-number (car thread)))))
4683
4684 (defun gnus-id-to-header (id)
4685   "Return the article headers of ID."
4686   (car (gnus-id-to-thread id)))
4687
4688 (defun gnus-article-displayed-root-p (article)
4689   "Say whether ARTICLE is a root(ish) article."
4690   (let ((level (gnus-summary-thread-level article))
4691         (refs (mail-header-references  (gnus-summary-article-header article)))
4692         particle)
4693     (cond
4694      ((null level) nil)
4695      ((zerop level) t)
4696      ((null refs) t)
4697      ((null (gnus-parent-id refs)) t)
4698      ((and (= 1 level)
4699            (null (setq particle (gnus-id-to-article
4700                                  (gnus-parent-id refs))))
4701            (null (gnus-summary-thread-level particle)))))))
4702
4703 (defun gnus-root-id (id)
4704   "Return the id of the root of the thread where ID appears."
4705   (let (last-id prev)
4706     (while (and id (setq prev (car (gnus-id-to-thread id))))
4707       (setq last-id id
4708             id (gnus-parent-id (mail-header-references prev))))
4709     last-id))
4710
4711 (defun gnus-articles-in-thread (thread)
4712   "Return the list of articles in THREAD."
4713   (cons (mail-header-number (car thread))
4714         (apply 'nconc (mapcar 'gnus-articles-in-thread (cdr thread)))))
4715
4716 (defun gnus-remove-thread (id &optional dont-remove)
4717   "Remove the thread that has ID in it."
4718   (let (headers thread last-id)
4719     ;; First go up in this thread until we find the root.
4720     (setq last-id (gnus-root-id id)
4721           headers (message-flatten-list (gnus-id-to-thread last-id)))
4722     ;; We have now found the real root of this thread.  It might have
4723     ;; been gathered into some loose thread, so we have to search
4724     ;; through the threads to find the thread we wanted.
4725     (let ((threads gnus-newsgroup-threads)
4726           sub)
4727       (while threads
4728         (setq sub (car threads))
4729         (if (stringp (car sub))
4730             ;; This is a gathered thread, so we look at the roots
4731             ;; below it to find whether this article is in this
4732             ;; gathered root.
4733             (progn
4734               (setq sub (cdr sub))
4735               (while sub
4736                 (when (member (caar sub) headers)
4737                   (setq thread (car threads)
4738                         threads nil
4739                         sub nil))
4740                 (setq sub (cdr sub))))
4741           ;; It's an ordinary thread, so we check it.
4742           (when (eq (car sub) (car headers))
4743             (setq thread sub
4744                   threads nil)))
4745         (setq threads (cdr threads)))
4746       ;; If this article is in no thread, then it's a root.
4747       (if thread
4748           (unless dont-remove
4749             (setq gnus-newsgroup-threads (delq thread gnus-newsgroup-threads)))
4750         (setq thread (gnus-id-to-thread last-id)))
4751       (when thread
4752         (prog1
4753             thread                      ; We return this thread.
4754           (unless dont-remove
4755             (if (stringp (car thread))
4756                 (progn
4757                   ;; If we use dummy roots, then we have to remove the
4758                   ;; dummy root as well.
4759                   (when (eq gnus-summary-make-false-root 'dummy)
4760                     ;; We go to the dummy root by going to
4761                     ;; the first sub-"thread", and then one line up.
4762                     (gnus-summary-goto-article
4763                      (mail-header-number (caadr thread)))
4764                     (forward-line -1)
4765                     (gnus-delete-line)
4766                     (gnus-data-compute-positions))
4767                   (setq thread (cdr thread))
4768                   (while thread
4769                     (gnus-remove-thread-1 (car thread))
4770                     (setq thread (cdr thread))))
4771               (gnus-remove-thread-1 thread))))))))
4772
4773 (defun gnus-remove-thread-1 (thread)
4774   "Remove the thread THREAD recursively."
4775   (let ((number (mail-header-number (pop thread)))
4776         d)
4777     (setq thread (reverse thread))
4778     (while thread
4779       (gnus-remove-thread-1 (pop thread)))
4780     (when (setq d (gnus-data-find number))
4781       (goto-char (gnus-data-pos d))
4782       (gnus-summary-show-thread)
4783       (gnus-data-remove
4784        number
4785        (- (point-at-bol)
4786           (prog1
4787               (1+ (point-at-eol))
4788             (gnus-delete-line)))))))
4789
4790 (defun gnus-sort-threads-recursive (threads func)
4791   (sort (mapcar (lambda (thread)
4792                   (cons (car thread)
4793                         (and (cdr thread)
4794                              (gnus-sort-threads-recursive (cdr thread) func))))
4795                 threads) func))
4796
4797 (defun gnus-sort-threads-loop (threads func)
4798   (let* ((superthread (cons nil threads))
4799          (stack (list (cons superthread threads)))
4800          remaining-threads thread)
4801     (while stack
4802       (setq remaining-threads (cdr (car stack)))
4803       (if remaining-threads
4804           (progn (setq thread (car remaining-threads))
4805                  (setcdr (car stack) (cdr remaining-threads))
4806                  (if (cdr thread)
4807                      (push (cons thread (cdr thread)) stack)))
4808         (setq thread (caar stack))
4809         (setcdr thread (sort (cdr thread) func))
4810         (pop stack)))
4811     (cdr superthread)))
4812
4813 (defun gnus-sort-threads (threads)
4814   "Sort THREADS."
4815   (if (not gnus-thread-sort-functions)
4816       threads
4817     (gnus-message 8 "Sorting threads...")
4818     (prog1
4819         (condition-case nil
4820             (let ((max-lisp-eval-depth (max max-lisp-eval-depth 5000)))
4821               (gnus-sort-threads-recursive
4822                threads (gnus-make-sort-function gnus-thread-sort-functions)))
4823           ;; Even after binding max-lisp-eval-depth, the recursive
4824           ;; sorter might fail for very long threads.  In that case,
4825           ;; try using a (less well-tested) non-recursive sorter.
4826           (error (gnus-message 9 "Sorting threads with loop...")
4827                  (gnus-sort-threads-loop
4828                   threads (gnus-make-sort-function
4829                            gnus-thread-sort-functions))))
4830       (gnus-message 8 "Sorting threads...done"))))
4831
4832 (defun gnus-sort-articles (articles)
4833   "Sort ARTICLES."
4834   (when gnus-article-sort-functions
4835     (gnus-message 7 "Sorting articles...")
4836     (prog1
4837         (setq gnus-newsgroup-headers
4838               (sort articles (gnus-make-sort-function
4839                               gnus-article-sort-functions)))
4840       (gnus-message 7 "Sorting articles...done"))))
4841
4842 ;; Written by Hallvard B Furuseth <h.b.furuseth@usit.uio.no>.
4843 (defmacro gnus-thread-header (thread)
4844   "Return header of first article in THREAD.
4845 Note that THREAD must never, ever be anything else than a variable -
4846 using some other form will lead to serious barfage."
4847   (or (symbolp thread) (signal 'wrong-type-argument '(symbolp thread)))
4848   ;; (8% speedup to gnus-summary-prepare, just for fun :-)
4849   (list 'byte-code "\10\211:\203\17\0\211@;\203\16\0A@@\207"
4850         (vector thread) 2))
4851
4852 (defsubst gnus-article-sort-by-number (h1 h2)
4853   "Sort articles by article number."
4854   (< (mail-header-number h1)
4855      (mail-header-number h2)))
4856
4857 (defun gnus-thread-sort-by-number (h1 h2)
4858   "Sort threads by root article number."
4859   (gnus-article-sort-by-number
4860    (gnus-thread-header h1) (gnus-thread-header h2)))
4861
4862 (defsubst gnus-article-sort-by-random (h1 h2)
4863   "Sort articles randomly."
4864   (zerop (random 2)))
4865
4866 (defun gnus-thread-sort-by-random (h1 h2)
4867   "Sort threads randomly."
4868   (gnus-article-sort-by-random
4869    (gnus-thread-header h1) (gnus-thread-header h2)))
4870
4871 (defsubst gnus-article-sort-by-lines (h1 h2)
4872   "Sort articles by article Lines header."
4873   (< (mail-header-lines h1)
4874      (mail-header-lines h2)))
4875
4876 (defun gnus-thread-sort-by-lines (h1 h2)
4877   "Sort threads by root article Lines header."
4878   (gnus-article-sort-by-lines
4879    (gnus-thread-header h1) (gnus-thread-header h2)))
4880
4881 (defsubst gnus-article-sort-by-chars (h1 h2)
4882   "Sort articles by octet length."
4883   (< (mail-header-chars h1)
4884      (mail-header-chars h2)))
4885
4886 (defun gnus-thread-sort-by-chars (h1 h2)
4887   "Sort threads by root article octet length."
4888   (gnus-article-sort-by-chars
4889    (gnus-thread-header h1) (gnus-thread-header h2)))
4890
4891 (defsubst gnus-article-sort-by-author (h1 h2)
4892   "Sort articles by root author."
4893   (gnus-string<
4894    (let ((extract (funcall
4895                    gnus-extract-address-components
4896                    (mail-header-from h1))))
4897      (or (car extract) (cadr extract) ""))
4898    (let ((extract (funcall
4899                    gnus-extract-address-components
4900                    (mail-header-from h2))))
4901      (or (car extract) (cadr extract) ""))))
4902
4903 (defun gnus-thread-sort-by-author (h1 h2)
4904   "Sort threads by root author."
4905   (gnus-article-sort-by-author
4906    (gnus-thread-header h1)  (gnus-thread-header h2)))
4907
4908 (defsubst gnus-article-sort-by-recipient (h1 h2)
4909   "Sort articles by recipient."
4910   (gnus-string<
4911    (let ((extract (funcall
4912                    gnus-extract-address-components
4913                    (or (cdr (assq 'To (mail-header-extra h1))) ""))))
4914      (or (car extract) (cadr extract)))
4915    (let ((extract (funcall
4916                    gnus-extract-address-components
4917                    (or (cdr (assq 'To (mail-header-extra h2))) ""))))
4918      (or (car extract) (cadr extract)))))
4919
4920 (defun gnus-thread-sort-by-recipient (h1 h2)
4921   "Sort threads by root recipient."
4922   (gnus-article-sort-by-recipient
4923    (gnus-thread-header h1) (gnus-thread-header h2)))
4924
4925 (defsubst gnus-article-sort-by-subject (h1 h2)
4926   "Sort articles by root subject."
4927   (gnus-string<
4928    (downcase (gnus-simplify-subject-re (mail-header-subject h1)))
4929    (downcase (gnus-simplify-subject-re (mail-header-subject h2)))))
4930
4931 (defun gnus-thread-sort-by-subject (h1 h2)
4932   "Sort threads by root subject."
4933   (gnus-article-sort-by-subject
4934    (gnus-thread-header h1) (gnus-thread-header h2)))
4935
4936 (defsubst gnus-article-sort-by-date (h1 h2)
4937   "Sort articles by root article date."
4938   (time-less-p
4939    (gnus-date-get-time (mail-header-date h1))
4940    (gnus-date-get-time (mail-header-date h2))))
4941
4942 (defun gnus-thread-sort-by-date (h1 h2)
4943   "Sort threads by root article date."
4944   (gnus-article-sort-by-date
4945    (gnus-thread-header h1) (gnus-thread-header h2)))
4946
4947 (defsubst gnus-article-sort-by-score (h1 h2)
4948   "Sort articles by root article score.
4949 Unscored articles will be counted as having a score of zero."
4950   (> (or (cdr (assq (mail-header-number h1)
4951                     gnus-newsgroup-scored))
4952          gnus-summary-default-score 0)
4953      (or (cdr (assq (mail-header-number h2)
4954                     gnus-newsgroup-scored))
4955          gnus-summary-default-score 0)))
4956
4957 (defun gnus-thread-sort-by-score (h1 h2)
4958   "Sort threads by root article score."
4959   (gnus-article-sort-by-score
4960    (gnus-thread-header h1) (gnus-thread-header h2)))
4961
4962 (defun gnus-thread-sort-by-total-score (h1 h2)
4963   "Sort threads by the sum of all scores in the thread.
4964 Unscored articles will be counted as having a score of zero."
4965   (> (gnus-thread-total-score h1) (gnus-thread-total-score h2)))
4966
4967 (defun gnus-thread-total-score (thread)
4968   ;; This function find the total score of THREAD.
4969   (cond
4970    ((null thread)
4971     0)
4972    ((consp thread)
4973     (if (stringp (car thread))
4974         (apply gnus-thread-score-function 0
4975                (mapcar 'gnus-thread-total-score-1 (cdr thread)))
4976       (gnus-thread-total-score-1 thread)))
4977    (t
4978     (gnus-thread-total-score-1 (list thread)))))
4979
4980 (defun gnus-thread-sort-by-most-recent-number (h1 h2)
4981   "Sort threads such that the thread with the most recently arrived article comes first."
4982   (> (gnus-thread-highest-number h1) (gnus-thread-highest-number h2)))
4983
4984 (defun gnus-thread-highest-number (thread)
4985   "Return the highest article number in THREAD."
4986   (apply 'max (mapcar (lambda (header)
4987                         (mail-header-number header))
4988                       (message-flatten-list thread))))
4989
4990 (defun gnus-thread-sort-by-most-recent-date (h1 h2)
4991   "Sort threads such that the thread with the most recently dated article comes first."
4992   (> (gnus-thread-latest-date h1) (gnus-thread-latest-date h2)))
4993
4994 ; Since this is called not only to sort the top-level threads, but
4995 ; also in recursive sorts to order the articles within a thread, each
4996 ; article will be processed many times.  Thus it speeds things up
4997 ; quite a bit to use gnus-date-get-time, which caches the time value.
4998 (defun gnus-thread-latest-date (thread)
4999   "Return the highest article date in THREAD."
5000   (apply 'max
5001          (mapcar (lambda (header) (gnus-float-time
5002                                    (gnus-date-get-time
5003                                     (mail-header-date header))))
5004                  (message-flatten-list thread))))
5005
5006 (defun gnus-thread-total-score-1 (root)
5007   ;; This function find the total score of the thread below ROOT.
5008   (setq root (car root))
5009   (apply gnus-thread-score-function
5010          (or (append
5011               (mapcar 'gnus-thread-total-score
5012                       (cdr (gnus-id-to-thread (mail-header-id root))))
5013               (when (> (mail-header-number root) 0)
5014                 (list (or (cdr (assq (mail-header-number root)
5015                                      gnus-newsgroup-scored))
5016                           gnus-summary-default-score 0))))
5017              (list gnus-summary-default-score)
5018              '(0))))
5019
5020 ;; Added by Per Abrahamsen <amanda@iesd.auc.dk>.
5021 (defvar gnus-tmp-prev-subject nil)
5022 (defvar gnus-tmp-false-parent nil)
5023 (defvar gnus-tmp-root-expunged nil)
5024 (defvar gnus-tmp-dummy-line nil)
5025
5026 (defun gnus-extra-header (type &optional header)
5027   "Return the extra header of TYPE."
5028   (or (cdr (assq type (mail-header-extra (or header gnus-tmp-header))))
5029       ""))
5030
5031 (defvar gnus-tmp-thread-tree-header-string "")
5032
5033 (defcustom gnus-sum-thread-tree-root "> "
5034   "With %B spec, used for the root of a thread.
5035 If nil, use subject instead."
5036   :version "22.1"
5037   :type '(radio (const :format "%v  " nil) string)
5038   :group 'gnus-thread)
5039
5040 (defcustom gnus-sum-thread-tree-false-root "> "
5041   "With %B spec, used for a false root of a thread.
5042 If nil, use subject instead."
5043   :version "22.1"
5044   :type '(radio (const :format "%v  " nil) string)
5045   :group 'gnus-thread)
5046
5047 (defcustom gnus-sum-thread-tree-single-indent ""
5048   "With %B spec, used for a thread with just one message.
5049 If nil, use subject instead."
5050   :version "22.1"
5051   :type '(radio (const :format "%v  " nil) string)
5052   :group 'gnus-thread)
5053
5054 (defcustom gnus-sum-thread-tree-vertical "| "
5055   "With %B spec, used for drawing a vertical line."
5056   :version "22.1"
5057   :type 'string
5058   :group 'gnus-thread)
5059
5060 (defcustom gnus-sum-thread-tree-indent "  "
5061   "With %B spec, used for indenting."
5062   :version "22.1"
5063   :type 'string
5064   :group 'gnus-thread)
5065
5066 (defcustom gnus-sum-thread-tree-leaf-with-other "+-> "
5067   "With %B spec, used for a leaf with brothers."
5068   :version "22.1"
5069   :type 'string
5070   :group 'gnus-thread)
5071
5072 (defcustom gnus-sum-thread-tree-single-leaf "\\-> "
5073   "With %B spec, used for a leaf without brothers."
5074   :version "22.1"
5075   :type 'string
5076   :group 'gnus-thread)
5077
5078 (defcustom gnus-summary-display-while-building nil
5079   "If non-nil, show and update the summary buffer as it's being built.
5080 If the value is t, update the buffer after every line is inserted.  If
5081 the value is an integer (N), update the display every N lines."
5082   :version "22.1"
5083   :group 'gnus-thread
5084   :type '(choice (const :tag "off" nil)
5085                  number
5086                  (const :tag "frequently" t)))
5087
5088 (defun gnus-summary-prepare-threads (threads)
5089   "Prepare summary buffer from THREADS and indentation LEVEL.
5090 THREADS is either a list of `(PARENT [(CHILD1 [(GRANDCHILD ...]...) ...])'
5091 or a straight list of headers."
5092   (gnus-message 7 "Generating summary...")
5093
5094   (setq gnus-newsgroup-threads threads)
5095   (beginning-of-line)
5096
5097   (let ((gnus-tmp-level 0)
5098         (default-score (or gnus-summary-default-score 0))
5099         (gnus-visual-p (gnus-visual-p 'summary-highlight 'highlight))
5100         (building-line-count gnus-summary-display-while-building)
5101         (building-count (integerp gnus-summary-display-while-building))
5102         thread number subject stack state gnus-tmp-gathered beg-match
5103         new-roots gnus-tmp-new-adopts thread-end simp-subject
5104         gnus-tmp-header gnus-tmp-unread gnus-tmp-downloaded
5105         gnus-tmp-replied gnus-tmp-subject-or-nil
5106         gnus-tmp-dummy gnus-tmp-indentation gnus-tmp-lines gnus-tmp-score
5107         gnus-tmp-score-char gnus-tmp-from gnus-tmp-name
5108         gnus-tmp-number gnus-tmp-opening-bracket gnus-tmp-closing-bracket
5109         tree-stack)
5110
5111     (setq gnus-tmp-prev-subject nil
5112           gnus-tmp-thread-tree-header-string "")
5113
5114     (if (vectorp (car threads))
5115         ;; If this is a straight (sic) list of headers, then a
5116         ;; threaded summary display isn't required, so we just create
5117         ;; an unthreaded one.
5118         (gnus-summary-prepare-unthreaded threads)
5119
5120       ;; Do the threaded display.
5121
5122       (if gnus-summary-display-while-building
5123           (switch-to-buffer (buffer-name)))
5124       (while (or threads stack gnus-tmp-new-adopts new-roots)
5125
5126         (if (and (= gnus-tmp-level 0)
5127                  (or (not stack)
5128                      (= (caar stack) 0))
5129                  (not gnus-tmp-false-parent)
5130                  (or gnus-tmp-new-adopts new-roots))
5131             (if gnus-tmp-new-adopts
5132                 (setq gnus-tmp-level (if gnus-tmp-root-expunged 0 1)
5133                       thread (list (car gnus-tmp-new-adopts))
5134                       gnus-tmp-header (caar thread)
5135                       gnus-tmp-new-adopts (cdr gnus-tmp-new-adopts))
5136               (when new-roots
5137                 (setq thread (list (car new-roots))
5138                       gnus-tmp-header (caar thread)
5139                       new-roots (cdr new-roots))))
5140
5141           (if threads
5142               ;; If there are some threads, we do them before the
5143               ;; threads on the stack.
5144               (setq thread threads
5145                     gnus-tmp-header (caar thread))
5146             ;; There were no current threads, so we pop something off
5147             ;; the stack.
5148             (setq state (car stack)
5149                   gnus-tmp-level (car state)
5150                   tree-stack (cadr state)
5151                   thread (caddr state)
5152                   stack (cdr stack)
5153                   gnus-tmp-header (caar thread))))
5154
5155         (setq gnus-tmp-false-parent nil)
5156         (setq gnus-tmp-root-expunged nil)
5157         (setq thread-end nil)
5158
5159         (if (stringp gnus-tmp-header)
5160             ;; The header is a dummy root.
5161             (cond
5162              ((eq gnus-summary-make-false-root 'adopt)
5163               ;; We let the first article adopt the rest.
5164               (setq gnus-tmp-new-adopts (nconc gnus-tmp-new-adopts
5165                                                (cddar thread)))
5166               (setq gnus-tmp-gathered
5167                     (nconc (mapcar
5168                             (lambda (h) (mail-header-number (car h)))
5169                             (cddar thread))
5170                            gnus-tmp-gathered))
5171               (setq thread (cons (list (caar thread)
5172                                        (cadar thread))
5173                                  (cdr thread)))
5174               (setq gnus-tmp-level -1
5175                     gnus-tmp-false-parent t))
5176              ((eq gnus-summary-make-false-root 'empty)
5177               ;; We print adopted articles with empty subject fields.
5178               (setq gnus-tmp-gathered
5179                     (nconc (mapcar
5180                             (lambda (h) (mail-header-number (car h)))
5181                             (cddar thread))
5182                            gnus-tmp-gathered))
5183               (setq gnus-tmp-level -1))
5184              ((eq gnus-summary-make-false-root 'dummy)
5185               ;; We remember that we probably want to output a dummy
5186               ;; root.
5187               (setq gnus-tmp-dummy-line gnus-tmp-header)
5188               (setq gnus-tmp-prev-subject gnus-tmp-header))
5189              (t
5190               ;; We do not make a root for the gathered
5191               ;; sub-threads at all.
5192               (setq gnus-tmp-level -1)))
5193
5194           (setq number (mail-header-number gnus-tmp-header)
5195                 subject (mail-header-subject gnus-tmp-header)
5196                 simp-subject (gnus-simplify-subject-fully subject))
5197
5198           (cond
5199            ;; If the thread has changed subject, we might want to make
5200            ;; this subthread into a root.
5201            ((and (null gnus-thread-ignore-subject)
5202                  (not (zerop gnus-tmp-level))
5203                  gnus-tmp-prev-subject
5204                  (not (string= gnus-tmp-prev-subject simp-subject)))
5205             (setq new-roots (nconc new-roots (list (car thread)))
5206                   thread-end t
5207                   gnus-tmp-header nil))
5208            ;; If the article lies outside the current limit,
5209            ;; then we do not display it.
5210            ((not (memq number gnus-newsgroup-limit))
5211             (setq gnus-tmp-gathered
5212                   (nconc (mapcar
5213                           (lambda (h) (mail-header-number (car h)))
5214                           (cdar thread))
5215                          gnus-tmp-gathered))
5216             (setq gnus-tmp-new-adopts (if (cdar thread)
5217                                           (append gnus-tmp-new-adopts
5218                                                   (cdar thread))
5219                                         gnus-tmp-new-adopts)
5220                   thread-end t
5221                   gnus-tmp-header nil)
5222             (when (zerop gnus-tmp-level)
5223               (setq gnus-tmp-root-expunged t)))
5224            ;; Perhaps this article is to be marked as read?
5225            ((and gnus-summary-mark-below
5226                  (< (or (cdr (assq number gnus-newsgroup-scored))
5227                         default-score)
5228                     gnus-summary-mark-below)
5229                  ;; Don't touch sparse articles.
5230                  (not (gnus-summary-article-sparse-p number))
5231                  (not (gnus-summary-article-ancient-p number)))
5232             (setq gnus-newsgroup-unreads
5233                   (delq number gnus-newsgroup-unreads))
5234             (if gnus-newsgroup-auto-expire
5235                 (setq gnus-newsgroup-expirable
5236                       (gnus-add-to-sorted-list
5237                        gnus-newsgroup-expirable number))
5238               (push (cons number gnus-low-score-mark)
5239                     gnus-newsgroup-reads))))
5240
5241           (when gnus-tmp-header
5242             ;; We may have an old dummy line to output before this
5243             ;; article.
5244             (when (and gnus-tmp-dummy-line
5245                        (gnus-subject-equal
5246                         gnus-tmp-dummy-line
5247                         (mail-header-subject gnus-tmp-header)))
5248               (gnus-summary-insert-dummy-line
5249                gnus-tmp-dummy-line (mail-header-number gnus-tmp-header))
5250               (setq gnus-tmp-dummy-line nil))
5251
5252             ;; Compute the mark.
5253             (setq gnus-tmp-unread (gnus-article-mark number))
5254
5255             (push (gnus-data-make number gnus-tmp-unread (1+ (point))
5256                                   gnus-tmp-header gnus-tmp-level)
5257                   gnus-newsgroup-data)
5258
5259             ;; Actually insert the line.
5260             (setq
5261              gnus-tmp-subject-or-nil
5262              (cond
5263               ((and gnus-thread-ignore-subject
5264                     gnus-tmp-prev-subject
5265                     (not (string= gnus-tmp-prev-subject simp-subject)))
5266                subject)
5267               ((zerop gnus-tmp-level)
5268                (if (and (eq gnus-summary-make-false-root 'empty)
5269                         (memq number gnus-tmp-gathered)
5270                         gnus-tmp-prev-subject
5271                         (string= gnus-tmp-prev-subject simp-subject))
5272                    gnus-summary-same-subject
5273                  subject))
5274               (t gnus-summary-same-subject)))
5275             (if (and (eq gnus-summary-make-false-root 'adopt)
5276                      (= gnus-tmp-level 1)
5277                      (memq number gnus-tmp-gathered))
5278                 (setq gnus-tmp-opening-bracket ?\<
5279                       gnus-tmp-closing-bracket ?\>)
5280               (setq gnus-tmp-opening-bracket ?\[
5281                     gnus-tmp-closing-bracket ?\]))
5282             (if (>= gnus-tmp-level (length gnus-thread-indent-array))
5283                 (gnus-make-thread-indent-array
5284                  (max (* 2 (length gnus-thread-indent-array))
5285                       gnus-tmp-level)))
5286             (setq
5287              gnus-tmp-indentation
5288              (aref gnus-thread-indent-array gnus-tmp-level)
5289              gnus-tmp-lines (mail-header-lines gnus-tmp-header)
5290              gnus-tmp-score (or (cdr (assq number gnus-newsgroup-scored))
5291                                 gnus-summary-default-score 0)
5292              gnus-tmp-score-char
5293              (if (or (null gnus-summary-default-score)
5294                      (<= (abs (- gnus-tmp-score gnus-summary-default-score))
5295                          gnus-summary-zcore-fuzz))
5296                  ?                      ;Whitespace
5297                (if (< gnus-tmp-score gnus-summary-default-score)
5298                    gnus-score-below-mark gnus-score-over-mark))
5299              gnus-tmp-replied
5300              (cond ((memq number gnus-newsgroup-processable)
5301                     gnus-process-mark)
5302                    ((memq number gnus-newsgroup-cached)
5303                     gnus-cached-mark)
5304                    ((memq number gnus-newsgroup-replied)
5305                     gnus-replied-mark)
5306                    ((memq number gnus-newsgroup-forwarded)
5307                     gnus-forwarded-mark)
5308                    ((memq number gnus-newsgroup-saved)
5309                     gnus-saved-mark)
5310                    ((memq number gnus-newsgroup-recent)
5311                     gnus-recent-mark)
5312                    ((memq number gnus-newsgroup-unseen)
5313                     gnus-unseen-mark)
5314                    (t gnus-no-mark))
5315              gnus-tmp-downloaded
5316              (cond ((memq number gnus-newsgroup-undownloaded)
5317                     gnus-undownloaded-mark)
5318                    (gnus-newsgroup-agentized
5319                     gnus-downloaded-mark)
5320                    (t
5321                     gnus-no-mark))
5322              gnus-tmp-from (mail-header-from gnus-tmp-header)
5323              gnus-tmp-name
5324              (cond
5325               ((string-match "<[^>]+> *$" gnus-tmp-from)
5326                (setq beg-match (match-beginning 0))
5327                (or (and (string-match "^\".+\"" gnus-tmp-from)
5328                         (substring gnus-tmp-from 1 (1- (match-end 0))))
5329                    (substring gnus-tmp-from 0 beg-match)))
5330               ((string-match "(.+)" gnus-tmp-from)
5331                (substring gnus-tmp-from
5332                           (1+ (match-beginning 0)) (1- (match-end 0))))
5333               (t gnus-tmp-from))
5334
5335              ;; Do the %B string
5336              gnus-tmp-thread-tree-header-string
5337              (cond
5338               ((not gnus-show-threads) "")
5339               ((zerop gnus-tmp-level)
5340                (cond ((cdar thread)
5341                       (or gnus-sum-thread-tree-root subject))
5342                      (gnus-tmp-new-adopts
5343                       (or gnus-sum-thread-tree-false-root subject))
5344                      (t
5345                       (or gnus-sum-thread-tree-single-indent subject))))
5346               (t
5347                (concat (apply 'concat
5348                               (mapcar (lambda (item)
5349                                         (if (= item 1)
5350                                             gnus-sum-thread-tree-vertical
5351                                           gnus-sum-thread-tree-indent))
5352                                       (cdr (reverse tree-stack))))
5353                        (if (nth 1 thread)
5354                            gnus-sum-thread-tree-leaf-with-other
5355                          gnus-sum-thread-tree-single-leaf)))))
5356             (when (string= gnus-tmp-name "")
5357               (setq gnus-tmp-name gnus-tmp-from))
5358             (unless (numberp gnus-tmp-lines)
5359               (setq gnus-tmp-lines -1))
5360             (if (= gnus-tmp-lines -1)
5361                 (setq gnus-tmp-lines "?")
5362               (setq gnus-tmp-lines (number-to-string gnus-tmp-lines)))
5363               (gnus-put-text-property
5364                (point)
5365                (progn (eval gnus-summary-line-format-spec) (point))
5366                'gnus-number number)
5367               (when gnus-visual-p
5368                 (forward-line -1)
5369                 (gnus-run-hooks 'gnus-summary-update-hook)
5370                 (forward-line 1))
5371
5372               (setq gnus-tmp-prev-subject simp-subject)))
5373
5374         (when (nth 1 thread)
5375           (push (list (max 0 gnus-tmp-level)
5376                       (copy-sequence tree-stack)
5377                       (nthcdr 1 thread))
5378                 stack))
5379         (push (if (nth 1 thread) 1 0) tree-stack)
5380         (incf gnus-tmp-level)
5381         (setq threads (if thread-end nil (cdar thread)))
5382         (if gnus-summary-display-while-building
5383             (if building-count
5384                 (progn
5385                   ;; use a set frequency
5386                   (setq building-line-count (1- building-line-count))
5387                   (when (= building-line-count 0)
5388                     (sit-for 0)
5389                     (setq building-line-count
5390                           gnus-summary-display-while-building)))
5391               ;; always
5392               (sit-for 0)))
5393         (unless threads
5394           (setq gnus-tmp-level 0)))))
5395   (gnus-message 7 "Generating summary...done"))
5396
5397 (defun gnus-summary-prepare-unthreaded (headers)
5398   "Generate an unthreaded summary buffer based on HEADERS."
5399   (let (header number mark)
5400
5401     (beginning-of-line)
5402
5403     (while headers
5404       ;; We may have to root out some bad articles...
5405       (when (memq (setq number (mail-header-number
5406                                 (setq header (pop headers))))
5407                   gnus-newsgroup-limit)
5408         ;; Mark article as read when it has a low score.
5409         (when (and gnus-summary-mark-below
5410                    (< (or (cdr (assq number gnus-newsgroup-scored))
5411                           gnus-summary-default-score 0)
5412                       gnus-summary-mark-below)
5413                    (not (gnus-summary-article-ancient-p number)))
5414           (setq gnus-newsgroup-unreads
5415                 (delq number gnus-newsgroup-unreads))
5416           (if gnus-newsgroup-auto-expire
5417               (push number gnus-newsgroup-expirable)
5418             (push (cons number gnus-low-score-mark)
5419                   gnus-newsgroup-reads)))
5420
5421         (setq mark (gnus-article-mark number))
5422         (push (gnus-data-make number mark (1+ (point)) header 0)
5423               gnus-newsgroup-data)
5424         (gnus-summary-insert-line
5425          header 0 number
5426          (memq number gnus-newsgroup-undownloaded)
5427          mark (memq number gnus-newsgroup-replied)
5428          (memq number gnus-newsgroup-expirable)
5429          (mail-header-subject header) nil
5430          (cdr (assq number gnus-newsgroup-scored))
5431          (memq number gnus-newsgroup-processable))))))
5432
5433 (defun gnus-summary-remove-list-identifiers ()
5434   "Remove list identifiers in `gnus-list-identifiers' from articles in the current group."
5435   (let ((regexp (if (consp gnus-list-identifiers)
5436                     (mapconcat 'identity gnus-list-identifiers " *\\|")
5437                   gnus-list-identifiers))
5438         changed subject)
5439     (when regexp
5440       (setq regexp (concat "^\\(?:R[Ee]: +\\)*\\(" regexp " *\\)"))
5441       (dolist (header gnus-newsgroup-headers)
5442         (setq subject (mail-header-subject header)
5443               changed nil)
5444         (while (string-match regexp subject)
5445           (setq subject
5446                 (concat (substring subject 0 (match-beginning 1))
5447                         (substring subject (match-end 0)))
5448                 changed t))
5449         (when changed
5450           (when (string-match "^\\(\\(?:R[Ee]: +\\)+\\)R[Ee]: +" subject)
5451             (setq subject
5452                   (concat (substring subject 0 (match-beginning 1))
5453                           (substring subject (match-end 1)))))
5454           (mail-header-set-subject header subject))))))
5455
5456 (defun gnus-fetch-headers (articles)
5457   "Fetch headers of ARTICLES."
5458   (let ((name (gnus-group-decoded-name gnus-newsgroup-name)))
5459     (gnus-message 5 "Fetching headers for %s..." name)
5460     (prog1
5461         (if (eq 'nov
5462                 (setq gnus-headers-retrieved-by
5463                       (gnus-retrieve-headers
5464                        articles gnus-newsgroup-name
5465                        ;; We might want to fetch old headers, but
5466                        ;; not if there is only 1 article.
5467                        (and (or (and
5468                                  (not (eq gnus-fetch-old-headers 'some))
5469                                  (not (numberp gnus-fetch-old-headers)))
5470                                 (> (length articles) 1))
5471                             gnus-fetch-old-headers))))
5472             (gnus-get-newsgroup-headers-xover
5473              articles nil nil gnus-newsgroup-name t)
5474           (gnus-get-newsgroup-headers))
5475       (gnus-message 5 "Fetching headers for %s...done" name))))
5476
5477 (defun gnus-select-newsgroup (group &optional read-all select-articles)
5478   "Select newsgroup GROUP.
5479 If READ-ALL is non-nil, all articles in the group are selected.
5480 If SELECT-ARTICLES, only select those articles from GROUP."
5481   (let* ((entry (gnus-group-entry group))
5482          ;;!!! Dirty hack; should be removed.
5483          (gnus-summary-ignore-duplicates
5484           (if (eq (car (gnus-find-method-for-group group)) 'nnvirtual)
5485               t
5486             gnus-summary-ignore-duplicates))
5487          (info (nth 2 entry))
5488          charset articles fetched-articles cached)
5489
5490     (unless (gnus-check-server
5491              (set (make-local-variable 'gnus-current-select-method)
5492                   (gnus-find-method-for-group group)))
5493       (error "Couldn't open server"))
5494     (setq charset (gnus-group-name-charset gnus-current-select-method group))
5495
5496     (or (and entry (not (eq (car entry) t))) ; Either it's active...
5497         (gnus-activate-group group)     ; Or we can activate it...
5498         (progn                          ; Or we bug out.
5499           (when (equal major-mode 'gnus-summary-mode)
5500             (gnus-kill-buffer (current-buffer)))
5501           (error
5502            "Couldn't activate group %s: %s"
5503            (mm-decode-coding-string group charset)
5504            (mm-decode-coding-string (gnus-status-message group) charset))))
5505
5506     (unless (gnus-request-group group t)
5507         (when (equal major-mode 'gnus-summary-mode)
5508           (gnus-kill-buffer (current-buffer)))
5509         (error "Couldn't request group %s: %s"
5510                (mm-decode-coding-string group charset)
5511                (mm-decode-coding-string (gnus-status-message group) charset)))
5512
5513     (when gnus-agent
5514       (gnus-agent-possibly-alter-active group (gnus-active group) info)
5515
5516       (setq gnus-summary-use-undownloaded-faces
5517             (gnus-agent-find-parameter
5518              group
5519              'agent-enable-undownloaded-faces)))
5520
5521     (setq gnus-newsgroup-name group
5522           gnus-newsgroup-unselected nil
5523           gnus-newsgroup-unreads (gnus-list-of-unread-articles group))
5524
5525     (let ((display (gnus-group-find-parameter group 'display)))
5526       (setq gnus-newsgroup-display
5527             (cond
5528              ((not (zerop (or (car-safe read-all) 0)))
5529               ;; The user entered the group with C-u SPC/RET, let's show
5530               ;; all articles.
5531               'gnus-not-ignore)
5532              ((eq display 'all)
5533               'gnus-not-ignore)
5534              ((arrayp display)
5535               (gnus-summary-display-make-predicate (mapcar 'identity display)))
5536              ((numberp display)
5537               ;; The following is probably the "correct" solution, but
5538               ;; it makes Gnus fetch all headers and then limit the
5539               ;; articles (which is slow), so instead we hack the
5540               ;; select-articles parameter instead. -- Simon Josefsson
5541               ;; <jas@kth.se>
5542               ;;
5543               ;; (gnus-byte-compile
5544               ;;  `(lambda () (> number ,(- (cdr (gnus-active group))
5545               ;;                         display)))))
5546               (setq select-articles
5547                     (gnus-uncompress-range
5548                      (cons (let ((tmp (- (cdr (gnus-active group)) display)))
5549                              (if (> tmp 0)
5550                                  tmp
5551                                1))
5552                            (cdr (gnus-active group)))))
5553               nil)
5554              (t
5555               nil))))
5556
5557     (gnus-summary-setup-default-charset)
5558
5559     ;; Kludge to avoid having cached articles nixed out in virtual groups.
5560     (when (gnus-virtual-group-p group)
5561       (setq cached gnus-newsgroup-cached))
5562
5563     (setq gnus-newsgroup-unreads
5564           (gnus-sorted-ndifference
5565            (gnus-sorted-ndifference gnus-newsgroup-unreads
5566                                     gnus-newsgroup-marked)
5567            gnus-newsgroup-dormant))
5568
5569     (setq gnus-newsgroup-processable nil)
5570
5571     (gnus-update-read-articles group gnus-newsgroup-unreads)
5572
5573     ;; Adjust and set lists of article marks.
5574     (when info
5575       (gnus-adjust-marked-articles info))
5576     (if (setq articles select-articles)
5577         (setq gnus-newsgroup-unselected
5578               (gnus-sorted-difference gnus-newsgroup-unreads articles))
5579       (setq articles (gnus-articles-to-read group read-all)))
5580
5581     (cond
5582      ((null articles)
5583       ;;(gnus-message 3 "Couldn't select newsgroup -- no articles to display")
5584       'quit)
5585      ((eq articles 0) nil)
5586      (t
5587       ;; Init the dependencies hash table.
5588       (setq gnus-newsgroup-dependencies
5589             (gnus-make-hashtable (length articles)))
5590       (gnus-set-global-variables)
5591       ;; Retrieve the headers and read them in.
5592
5593       (setq gnus-newsgroup-headers (gnus-fetch-headers articles))
5594
5595       ;; Kludge to avoid having cached articles nixed out in virtual groups.
5596       (when cached
5597         (setq gnus-newsgroup-cached cached))
5598
5599       ;; Suppress duplicates?
5600       (when gnus-suppress-duplicates
5601         (gnus-dup-suppress-articles))
5602
5603       ;; Set the initial limit.
5604       (setq gnus-newsgroup-limit (copy-sequence articles))
5605       ;; Remove canceled articles from the list of unread articles.
5606       (setq fetched-articles
5607             (mapcar (lambda (headers) (mail-header-number headers))
5608                     gnus-newsgroup-headers))
5609       (setq gnus-newsgroup-articles fetched-articles)
5610       (setq gnus-newsgroup-unreads
5611             (gnus-sorted-nintersection
5612              gnus-newsgroup-unreads fetched-articles))
5613       (gnus-compute-unseen-list)
5614
5615       ;; Removed marked articles that do not exist.
5616       (gnus-update-missing-marks
5617        (gnus-sorted-difference articles fetched-articles))
5618       ;; We might want to build some more threads first.
5619       (when (and gnus-fetch-old-headers
5620                  (eq gnus-headers-retrieved-by 'nov))
5621         (if (eq gnus-fetch-old-headers 'invisible)
5622             (gnus-build-all-threads)
5623           (gnus-build-old-threads)))
5624       ;; Let the Gnus agent mark articles as read.
5625       (when gnus-agent
5626         (gnus-agent-get-undownloaded-list))
5627       ;; Remove list identifiers from subject
5628       (when gnus-list-identifiers
5629         (gnus-summary-remove-list-identifiers))
5630       ;; Check whether auto-expire is to be done in this group.
5631       (setq gnus-newsgroup-auto-expire
5632             (gnus-group-auto-expirable-p group))
5633       ;; Set up the article buffer now, if necessary.
5634       (unless (and gnus-single-article-buffer
5635                    (equal gnus-article-buffer "*Article*"))
5636         (gnus-article-setup-buffer))
5637       ;; First and last article in this newsgroup.
5638       (when gnus-newsgroup-headers
5639         (setq gnus-newsgroup-begin
5640               (mail-header-number (car gnus-newsgroup-headers))
5641               gnus-newsgroup-end
5642               (mail-header-number
5643                (gnus-last-element gnus-newsgroup-headers))))
5644       ;; GROUP is successfully selected.
5645       (or gnus-newsgroup-headers t)))))
5646
5647 (defun gnus-compute-unseen-list ()
5648   ;; The `seen' marks are treated specially.
5649   (if (not gnus-newsgroup-seen)
5650       (setq gnus-newsgroup-unseen gnus-newsgroup-articles)
5651     (setq gnus-newsgroup-unseen
5652           (gnus-inverse-list-range-intersection
5653            gnus-newsgroup-articles gnus-newsgroup-seen))))
5654
5655 (declare-function gnus-get-predicate "gnus-agent" (predicate))
5656
5657 (defun gnus-summary-display-make-predicate (display)
5658   (require 'gnus-agent)
5659   (when (= (length display) 1)
5660     (setq display (car display)))
5661   (unless gnus-summary-display-cache
5662     (dolist (elem (append '((unread . unread)
5663                             (read . read)
5664                             (unseen . unseen))
5665                           gnus-article-mark-lists))
5666       (push (cons (cdr elem)
5667                   (gnus-byte-compile
5668                    `(lambda () (gnus-article-marked-p ',(cdr elem)))))
5669             gnus-summary-display-cache)))
5670   (let ((gnus-category-predicate-alist gnus-summary-display-cache)
5671         (gnus-category-predicate-cache gnus-summary-display-cache))
5672     (gnus-get-predicate display)))
5673
5674 ;; Uses the dynamically bound `number' variable.
5675 (defvar number)
5676 (defun gnus-article-marked-p (type &optional article)
5677   (let ((article (or article number)))
5678     (cond
5679      ((eq type 'tick)
5680       (memq article gnus-newsgroup-marked))
5681      ((eq type 'spam)
5682       (memq article gnus-newsgroup-spam-marked))
5683      ((eq type 'unsend)
5684       (memq article gnus-newsgroup-unsendable))
5685      ((eq type 'undownload)
5686       (memq article gnus-newsgroup-undownloaded))
5687      ((eq type 'download)
5688       (memq article gnus-newsgroup-downloadable))
5689      ((eq type 'unread)
5690       (memq article gnus-newsgroup-unreads))
5691      ((eq type 'read)
5692       (memq article gnus-newsgroup-reads))
5693      ((eq type 'dormant)
5694       (memq article gnus-newsgroup-dormant) )
5695      ((eq type 'expire)
5696       (memq article gnus-newsgroup-expirable))
5697      ((eq type 'reply)
5698       (memq article gnus-newsgroup-replied))
5699      ((eq type 'killed)
5700       (memq article gnus-newsgroup-killed))
5701      ((eq type 'bookmark)
5702       (assq article gnus-newsgroup-bookmarks))
5703      ((eq type 'score)
5704       (assq article gnus-newsgroup-scored))
5705      ((eq type 'save)
5706       (memq article gnus-newsgroup-saved))
5707      ((eq type 'cache)
5708       (memq article gnus-newsgroup-cached))
5709      ((eq type 'forward)
5710       (memq article gnus-newsgroup-forwarded))
5711      ((eq type 'seen)
5712       (not (memq article gnus-newsgroup-unseen)))
5713      ((eq type 'recent)
5714       (memq article gnus-newsgroup-recent))
5715      (t t))))
5716
5717 (defun gnus-articles-to-read (group &optional read-all)
5718   "Find out what articles the user wants to read."
5719   (let* ((articles
5720           ;; Select all articles if `read-all' is non-nil, or if there
5721           ;; are no unread articles.
5722           (if (or read-all
5723                   (and (zerop (length gnus-newsgroup-marked))
5724                        (zerop (length gnus-newsgroup-unreads)))
5725                   ;; Fetch all if the predicate is non-nil.
5726                   gnus-newsgroup-display)
5727               ;; We want to select the headers for all the articles in
5728               ;; the group, so we select either all the active
5729               ;; articles in the group, or (if that's nil), the
5730               ;; articles in the cache.
5731               (or
5732                (if gnus-newsgroup-maximum-articles
5733                    (let ((active (gnus-active group)))
5734                      (gnus-uncompress-range
5735                       (cons (max (car active)
5736                                  (- (cdr active)
5737                                     gnus-newsgroup-maximum-articles
5738                                     -1))
5739                             (cdr active))))
5740                  (gnus-uncompress-range (gnus-active group)))
5741                (gnus-cache-articles-in-group group))
5742             ;; Select only the "normal" subset of articles.
5743             (gnus-sorted-nunion
5744              (gnus-sorted-union gnus-newsgroup-dormant gnus-newsgroup-marked)
5745              gnus-newsgroup-unreads)))
5746          (scored-list (gnus-killed-articles gnus-newsgroup-killed articles))
5747          (scored (length scored-list))
5748          (number (length articles))
5749          (marked (+ (length gnus-newsgroup-marked)
5750                     (length gnus-newsgroup-dormant)))
5751          (select
5752           (cond
5753            ((numberp read-all)
5754             read-all)
5755            ((numberp gnus-newsgroup-display)
5756             gnus-newsgroup-display)
5757            (t
5758             (condition-case ()
5759                 (cond
5760                  ((and (or (<= scored marked) (= scored number))
5761                        (numberp gnus-large-newsgroup)
5762                        (> number gnus-large-newsgroup))
5763                   (let* ((cursor-in-echo-area nil)
5764                          (initial (gnus-parameter-large-newsgroup-initial
5765                                    gnus-newsgroup-name))
5766                          (input
5767                           (read-string
5768                            (format
5769                             "How many articles from %s (%s %d): "
5770                             (gnus-group-decoded-name gnus-newsgroup-name)
5771                             (if initial "max" "default")
5772                             number)
5773                            (if initial
5774                                (cons (number-to-string initial)
5775                                      0)))))
5776                     (if (string-match "^[ \t]*$" input) number input)))
5777                  ((and (> scored marked) (< scored number)
5778                        (> (- scored number) 20))
5779                   (let ((input
5780                          (read-string
5781                           (format "%s %s (%d scored, %d total): "
5782                                   "How many articles from"
5783                                   (gnus-group-decoded-name group)
5784                                   scored number))))
5785                     (if (string-match "^[ \t]*$" input)
5786                         number input)))
5787                  (t number))
5788               (quit
5789                (message "Quit getting the articles to read")
5790                nil))))))
5791     (setq select (if (stringp select) (string-to-number select) select))
5792     (if (or (null select) (zerop select))
5793         select
5794       (if (and (not (zerop scored)) (<= (abs select) scored))
5795           (progn
5796             (setq articles (sort scored-list '<))
5797             (setq number (length articles)))
5798         (setq articles (copy-sequence articles)))
5799
5800       (when (< (abs select) number)
5801         (if (< select 0)
5802             ;; Select the N oldest articles.
5803             (setcdr (nthcdr (1- (abs select)) articles) nil)
5804           ;; Select the N most recent articles.
5805           (setq articles (nthcdr (- number select) articles))))
5806       (setq gnus-newsgroup-unselected
5807             (gnus-sorted-difference gnus-newsgroup-unreads articles))
5808       (when gnus-alter-articles-to-read-function
5809         (setq articles
5810               (sort
5811                (funcall gnus-alter-articles-to-read-function
5812                         gnus-newsgroup-name articles)
5813                '<)))
5814       articles)))
5815
5816 (defun gnus-killed-articles (killed articles)
5817   (let (out)
5818     (while articles
5819       (when (inline (gnus-member-of-range (car articles) killed))
5820         (push (car articles) out))
5821       (setq articles (cdr articles)))
5822     out))
5823
5824 (defun gnus-uncompress-marks (marks)
5825   "Uncompress the mark ranges in MARKS."
5826   (let ((uncompressed '(score bookmark))
5827         out)
5828     (while marks
5829       (if (memq (caar marks) uncompressed)
5830           (push (car marks) out)
5831         (push (cons (caar marks) (gnus-uncompress-range (cdar marks))) out))
5832       (setq marks (cdr marks)))
5833     out))
5834
5835 (defun gnus-article-mark-to-type (mark)
5836   "Return the type of MARK."
5837   (or (cadr (assq mark gnus-article-special-mark-lists))
5838       'list))
5839
5840 (defun gnus-article-unpropagatable-p (mark)
5841   "Return whether MARK should be propagated to back end."
5842   (memq mark gnus-article-unpropagated-mark-lists))
5843
5844 (defun gnus-adjust-marked-articles (info)
5845   "Set all article lists and remove all marks that are no longer valid."
5846   (let* ((marked-lists (gnus-info-marks info))
5847          (active (gnus-active (gnus-info-group info)))
5848          (min (car active))
5849          (max (cdr active))
5850          (types gnus-article-mark-lists)
5851          marks var articles article mark mark-type
5852          bgn end)
5853
5854     (dolist (marks marked-lists)
5855       (setq mark (car marks)
5856             mark-type (gnus-article-mark-to-type mark)
5857             var (intern (format "gnus-newsgroup-%s" (car (rassq mark types)))))
5858
5859       ;; We set the variable according to the type of the marks list,
5860       ;; and then adjust the marks to a subset of the active articles.
5861       (cond
5862        ;; Adjust "simple" lists - compressed yet unsorted
5863        ((eq mark-type 'list)
5864         ;; Simultaneously uncompress and clip to active range
5865         ;; See gnus-uncompress-range for a description of possible marks
5866         (let (l lh)
5867           (if (not (cadr marks))
5868               (set var nil)
5869             (setq articles (if (numberp (cddr marks))
5870                                (list (cdr marks))
5871                              (cdr marks))
5872                   lh (cons nil nil)
5873                   l lh)
5874
5875             (while (setq article (pop articles))
5876               (cond ((consp article)
5877                      (setq bgn (max (car article) min)
5878                            end (min (cdr article) max))
5879                      (while (<= bgn end)
5880                        (setq l (setcdr l (cons bgn nil))
5881                              bgn (1+ bgn))))
5882                     ((and (<= min article)
5883                           (>= max article))
5884                      (setq l (setcdr l (cons article nil))))))
5885             (set var (cdr lh)))))
5886        ;; Adjust assocs.
5887        ((eq mark-type 'tuple)
5888         (set var (setq articles (cdr marks)))
5889         (when (not (listp (cdr (symbol-value var))))
5890           (set var (list (symbol-value var))))
5891         (when (not (listp (cdr articles)))
5892           (setq articles (list articles)))
5893         (while articles
5894           (when (or (not (consp (setq article (pop articles))))
5895                     (< (car article) min)
5896                     (> (car article) max))
5897             (set var (delq article (symbol-value var))))))
5898        ;; Adjust ranges (sloppily).
5899        ((eq mark-type 'range)
5900         (cond
5901          ((eq mark 'seen)
5902           ;; Fix the record for `seen' if it looks like (seen NUM1 . NUM2).
5903           ;; It should be (seen (NUM1 . NUM2)).
5904           (when (numberp (cddr marks))
5905             (setcdr marks (list (cdr marks))))
5906           (setq articles (cdr marks))
5907           (while (and articles
5908                       (or (and (consp (car articles))
5909                                (> min (cdar articles)))
5910                           (and (numberp (car articles))
5911                                (> min (car articles)))))
5912             (pop articles))
5913           (set var articles))))))))
5914
5915 (defun gnus-update-missing-marks (missing)
5916   "Go through the list of MISSING articles and remove them from the mark lists."
5917   (when missing
5918     (let (var m)
5919       ;; Go through all types.
5920       (dolist (elem gnus-article-mark-lists)
5921         (when (eq (gnus-article-mark-to-type (cdr elem)) 'list)
5922           (setq var (intern (format "gnus-newsgroup-%s" (car elem))))
5923           (when (symbol-value var)
5924             ;; This list has articles.  So we delete all missing
5925             ;; articles from it.
5926             (setq m missing)
5927             (while m
5928               (set var (delq (pop m) (symbol-value var))))))))))
5929
5930 (defun gnus-update-marks ()
5931   "Enter the various lists of marked articles into the newsgroup info list."
5932   (let ((types gnus-article-mark-lists)
5933         (info (gnus-get-info gnus-newsgroup-name))
5934         type list newmarked symbol delta-marks)
5935     (when info
5936       ;; Add all marks lists to the list of marks lists.
5937       (while (setq type (pop types))
5938         (setq list (symbol-value
5939                     (setq symbol
5940                           (intern (format "gnus-newsgroup-%s" (car type))))))
5941
5942         (when list
5943           ;; Get rid of the entries of the articles that have the
5944           ;; default score.
5945           (when (and (eq (cdr type) 'score)
5946                      gnus-save-score
5947                      list)
5948             (let* ((arts list)
5949                    (prev (cons nil list))
5950                    (all prev))
5951               (while arts
5952                 (if (or (not (consp (car arts)))
5953                         (= (cdar arts) gnus-summary-default-score))
5954                     (setcdr prev (cdr arts))
5955                   (setq prev arts))
5956                 (setq arts (cdr arts)))
5957               (setq list (cdr all)))))
5958
5959         (when (eq (cdr type) 'seen)
5960           (setq list (gnus-range-add list gnus-newsgroup-unseen)))
5961
5962         (when (eq (gnus-article-mark-to-type (cdr type)) 'list)
5963           (setq list (gnus-compress-sequence (set symbol (sort list '<)) t)))
5964
5965         (when (and (gnus-check-backend-function
5966                     'request-set-mark gnus-newsgroup-name)
5967                    (not (gnus-article-unpropagatable-p (cdr type))))
5968           (let* ((old (cdr (assq (cdr type) (gnus-info-marks info))))
5969                  (del (gnus-remove-from-range (gnus-copy-sequence old) list))
5970                  (add (gnus-remove-from-range
5971                        (gnus-copy-sequence list) old)))
5972             (when add
5973               (push (list add 'add (list (cdr type))) delta-marks))
5974             (when del
5975               (push (list del 'del (list (cdr type))) delta-marks))))
5976
5977         (when list
5978           (push (cons (cdr type) list) newmarked)))
5979
5980       (when delta-marks
5981         (unless (gnus-check-group gnus-newsgroup-name)
5982           (error "Can't open server for %s" gnus-newsgroup-name))
5983         (gnus-request-set-mark gnus-newsgroup-name delta-marks))
5984
5985       ;; Enter these new marks into the info of the group.
5986       (if (nthcdr 3 info)
5987           (setcar (nthcdr 3 info) newmarked)
5988         ;; Add the marks lists to the end of the info.
5989         (when newmarked
5990           (setcdr (nthcdr 2 info) (list newmarked))))
5991
5992       ;; Cut off the end of the info if there's nothing else there.
5993       (let ((i 5))
5994         (while (and (> i 2)
5995                     (not (nth i info)))
5996           (when (nthcdr (decf i) info)
5997             (setcdr (nthcdr i info) nil)))))))
5998
5999 (defun gnus-set-mode-line (where)
6000   "Set the mode line of the article or summary buffers.
6001 If WHERE is `summary', the summary mode line format will be used."
6002   ;; Is this mode line one we keep updated?
6003   (when (and (memq where gnus-updated-mode-lines)
6004              (symbol-value
6005               (intern (format "gnus-%s-mode-line-format-spec" where))))
6006     (let (mode-string)
6007       ;; We evaluate this in the summary buffer since these
6008       ;; variables are buffer-local to that buffer.
6009       (with-current-buffer gnus-summary-buffer
6010         ;; We bind all these variables that are used in the `eval' form
6011         ;; below.
6012         (let* ((mformat (symbol-value
6013                          (intern
6014                           (format "gnus-%s-mode-line-format-spec" where))))
6015                (gnus-tmp-group-name (gnus-mode-string-quote
6016                                      (gnus-group-decoded-name
6017                                       gnus-newsgroup-name)))
6018                (gnus-tmp-article-number (or gnus-current-article 0))
6019                (gnus-tmp-unread gnus-newsgroup-unreads)
6020                (gnus-tmp-unread-and-unticked (length gnus-newsgroup-unreads))
6021                (gnus-tmp-unselected (length gnus-newsgroup-unselected))
6022                (gnus-tmp-unread-and-unselected
6023                 (cond ((and (zerop gnus-tmp-unread-and-unticked)
6024                             (zerop gnus-tmp-unselected))
6025                        "")
6026                       ((zerop gnus-tmp-unselected)
6027                        (format "{%d more}" gnus-tmp-unread-and-unticked))
6028                       (t (format "{%d(+%d) more}"
6029                                  gnus-tmp-unread-and-unticked
6030                                  gnus-tmp-unselected))))
6031                (gnus-tmp-subject
6032                 (if (and gnus-current-headers
6033                          (vectorp gnus-current-headers))
6034                     (gnus-mode-string-quote
6035                      (mail-header-subject gnus-current-headers))
6036                   ""))
6037                bufname-length max-len
6038                gnus-tmp-header) ;; passed as argument to any user-format-funcs
6039           (setq mode-string (eval mformat))
6040           (setq bufname-length (if (string-match "%b" mode-string)
6041                                    (- (length
6042                                        (buffer-name
6043                                         (if (eq where 'summary)
6044                                             nil
6045                                           (get-buffer gnus-article-buffer))))
6046                                       2)
6047                                  0))
6048           (setq max-len (max 4 (if gnus-mode-non-string-length
6049                                    (- (window-width)
6050                                       gnus-mode-non-string-length
6051                                       bufname-length)
6052                                  (length mode-string))))
6053           ;; We might have to chop a bit of the string off...
6054           (when (> (length mode-string) max-len)
6055             (setq mode-string
6056                   (concat (truncate-string-to-width mode-string (- max-len 3))
6057                           "...")))
6058           ;; Pad the mode string a bit.
6059           (setq mode-string (format (format "%%-%ds" max-len) mode-string))))
6060       ;; Update the mode line.
6061       (setq mode-line-buffer-identification
6062             (gnus-mode-line-buffer-identification (list mode-string)))
6063       (set-buffer-modified-p t))))
6064
6065 (defun gnus-create-xref-hashtb (from-newsgroup headers unreads)
6066   "Go through the HEADERS list and add all Xrefs to a hash table.
6067 The resulting hash table is returned, or nil if no Xrefs were found."
6068   (let* ((virtual (gnus-virtual-group-p from-newsgroup))
6069          (prefix (if virtual "" (gnus-group-real-prefix from-newsgroup)))
6070          (xref-hashtb (gnus-make-hashtable))
6071          start group entry number xrefs header)
6072     (while headers
6073       (setq header (pop headers))
6074       (when (and (setq xrefs (mail-header-xref header))
6075                  (not (memq (setq number (mail-header-number header))
6076                             unreads)))
6077         (setq start 0)
6078         (while (string-match "\\([^ ]+\\)[:/]\\([0-9]+\\)" xrefs start)
6079           (setq start (match-end 0))
6080           (setq group (if prefix
6081                           (concat prefix (substring xrefs (match-beginning 1)
6082                                                     (match-end 1)))
6083                         (substring xrefs (match-beginning 1) (match-end 1))))
6084           (setq number
6085                 (string-to-number (substring xrefs (match-beginning 2)
6086                                           (match-end 2))))
6087           (if (setq entry (gnus-gethash group xref-hashtb))
6088               (setcdr entry (cons number (cdr entry)))
6089             (gnus-sethash group (cons number nil) xref-hashtb)))))
6090     (and start xref-hashtb)))
6091
6092 (defun gnus-mark-xrefs-as-read (from-newsgroup headers unreads)
6093   "Look through all the headers and mark the Xrefs as read."
6094   (let ((virtual (gnus-virtual-group-p from-newsgroup))
6095         name info xref-hashtb idlist method nth4)
6096     (with-current-buffer gnus-group-buffer
6097       (when (setq xref-hashtb
6098                   (gnus-create-xref-hashtb from-newsgroup headers unreads))
6099         (mapatoms
6100          (lambda (group)
6101            (unless (string= from-newsgroup (setq name (symbol-name group)))
6102              (setq idlist (symbol-value group))
6103              ;; Dead groups are not updated.
6104              (and (prog1
6105                       (setq info (gnus-get-info name))
6106                     (when (stringp (setq nth4 (gnus-info-method info)))
6107                       (setq nth4 (gnus-server-to-method nth4))))
6108                   ;; Only do the xrefs if the group has the same
6109                   ;; select method as the group we have just read.
6110                   (or (gnus-methods-equal-p
6111                        nth4 (gnus-find-method-for-group from-newsgroup))
6112                       virtual
6113                       (equal nth4 (setq method (gnus-find-method-for-group
6114                                                 from-newsgroup)))
6115                       (and (equal (car nth4) (car method))
6116                            (equal (nth 1 nth4) (nth 1 method))))
6117                   gnus-use-cross-reference
6118                   (or (not (eq gnus-use-cross-reference t))
6119                       virtual
6120                       ;; Only do cross-references on subscribed
6121                       ;; groups, if that is what is wanted.
6122                       (<= (gnus-info-level info) gnus-level-subscribed))
6123                   (gnus-group-make-articles-read name idlist))))
6124          xref-hashtb)))))
6125
6126 (defun gnus-compute-read-articles (group articles)
6127   (let* ((entry (gnus-group-entry group))
6128          (info (nth 2 entry))
6129          (active (gnus-active group))
6130          ninfo)
6131     (when entry
6132       ;; First peel off all invalid article numbers.
6133       (when active
6134         (let ((ids articles)
6135               id first)
6136           (while (setq id (pop ids))
6137             (when (and first (> id (cdr active)))
6138               ;; We'll end up in this situation in one particular
6139               ;; obscure situation.  If you re-scan a group and get
6140               ;; a new article that is cross-posted to a different
6141               ;; group that has not been re-scanned, you might get
6142               ;; crossposted article that has a higher number than
6143               ;; Gnus believes possible.  So we re-activate this
6144               ;; group as well.  This might mean doing the
6145               ;; crossposting thingy will *increase* the number
6146               ;; of articles in some groups.  Tsk, tsk.
6147               (setq active (or (gnus-activate-group group) active)))
6148             (when (or (> id (cdr active))
6149                       (< id (car active)))
6150               (setq articles (delq id articles))))))
6151       ;; If the read list is nil, we init it.
6152       (if (and active
6153                (null (gnus-info-read info))
6154                (> (car active) 1))
6155           (setq ninfo (cons 1 (1- (car active))))
6156         (setq ninfo (gnus-info-read info)))
6157       ;; Then we add the read articles to the range.
6158       (gnus-add-to-range
6159        ninfo (setq articles (sort articles '<))))))
6160
6161 (defun gnus-group-make-articles-read (group articles)
6162   "Update the info of GROUP to say that ARTICLES are read."
6163   (let* ((num 0)
6164          (entry (gnus-group-entry group))
6165          (info (nth 2 entry))
6166          (active (gnus-active group))
6167          range)
6168     (when entry
6169       (setq range (gnus-compute-read-articles group articles))
6170       (with-current-buffer gnus-group-buffer
6171         (gnus-undo-register
6172           `(progn
6173              (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
6174              (gnus-info-set-read ',info ',(gnus-info-read info))
6175              (gnus-get-unread-articles-in-group ',info (gnus-active ,group))
6176              (gnus-request-set-mark ,group (list (list ',range 'del '(read))))
6177              (gnus-group-update-group ,group t))))
6178       ;; Add the read articles to the range.
6179       (gnus-info-set-read info range)
6180       (gnus-request-set-mark group (list (list range 'add '(read))))
6181       ;; Then we have to re-compute how many unread
6182       ;; articles there are in this group.
6183       (when active
6184         (cond
6185          ((not range)
6186           (setq num (- (1+ (cdr active)) (car active))))
6187          ((not (listp (cdr range)))
6188           (setq num (- (cdr active) (- (1+ (cdr range))
6189                                        (car range)))))
6190          (t
6191           (while range
6192             (if (numberp (car range))
6193                 (setq num (1+ num))
6194               (setq num (+ num (- (1+ (cdar range)) (caar range)))))
6195             (setq range (cdr range)))
6196           (setq num (- (cdr active) num))))
6197         ;; Update the number of unread articles.
6198         (setcar entry num)
6199         ;; Update the group buffer.
6200         (unless (gnus-ephemeral-group-p group)
6201           (gnus-group-update-group group t))))))
6202
6203 (defvar gnus-newsgroup-none-id 0)
6204
6205 (defun gnus-get-newsgroup-headers (&optional dependencies force-new)
6206   (let ((cur nntp-server-buffer)
6207         (dependencies
6208          (or dependencies
6209              (with-current-buffer gnus-summary-buffer
6210                gnus-newsgroup-dependencies)))
6211         headers id end ref number
6212         (mail-parse-charset gnus-newsgroup-charset)
6213         (mail-parse-ignored-charsets
6214          (save-current-buffer (condition-case nil
6215                                   (set-buffer gnus-summary-buffer)
6216                                 (error))
6217                               gnus-newsgroup-ignored-charsets)))
6218     (with-current-buffer nntp-server-buffer
6219       ;; Translate all TAB characters into SPACE characters.
6220       (subst-char-in-region (point-min) (point-max) ?\t ?  t)
6221       (subst-char-in-region (point-min) (point-max) ?\r ?  t)
6222       (ietf-drums-unfold-fws)
6223       (gnus-run-hooks 'gnus-parse-headers-hook)
6224       (let ((case-fold-search t)
6225             in-reply-to header p lines chars)
6226         (goto-char (point-min))
6227         ;; Search to the beginning of the next header.  Error messages
6228         ;; do not begin with 2 or 3.
6229         (while (re-search-forward "^[23][0-9]+ " nil t)
6230           (setq id nil
6231                 ref nil)
6232           ;; This implementation of this function, with nine
6233           ;; search-forwards instead of the one re-search-forward and
6234           ;; a case (which basically was the old function) is actually
6235           ;; about twice as fast, even though it looks messier.  You
6236           ;; can't have everything, I guess.  Speed and elegance
6237           ;; doesn't always go hand in hand.
6238           (setq
6239            header
6240            (vector
6241             ;; Number.
6242             (prog1
6243                 (setq number (read cur))
6244               (end-of-line)
6245               (setq p (point))
6246               (narrow-to-region (point)
6247                                 (or (and (search-forward "\n.\n" nil t)
6248                                          (- (point) 2))
6249                                     (point))))
6250             ;; Subject.
6251             (progn
6252               (goto-char p)
6253               (if (search-forward "\nsubject:" nil t)
6254                   (funcall gnus-decode-encoded-word-function
6255                            (nnheader-header-value))
6256                 "(none)"))
6257             ;; From.
6258             (progn
6259               (goto-char p)
6260               (if (search-forward "\nfrom:" nil t)
6261                   (funcall gnus-decode-encoded-address-function
6262                            (nnheader-header-value))
6263                 "(nobody)"))
6264             ;; Date.
6265             (progn
6266               (goto-char p)
6267               (if (search-forward "\ndate:" nil t)
6268                   (nnheader-header-value) ""))
6269             ;; Message-ID.
6270             (progn
6271               (goto-char p)
6272               (setq id (if (re-search-forward
6273                             "^message-id: *\\(<[^\n\t> ]+>\\)" nil t)
6274                            ;; We do it this way to make sure the Message-ID
6275                            ;; is (somewhat) syntactically valid.
6276                            (buffer-substring (match-beginning 1)
6277                                              (match-end 1))
6278                          ;; If there was no message-id, we just fake one
6279                          ;; to make subsequent routines simpler.
6280                          (nnheader-generate-fake-message-id number))))
6281             ;; References.
6282             (progn
6283               (goto-char p)
6284               (if (search-forward "\nreferences:" nil t)
6285                   (progn
6286                     (setq end (point))
6287                     (prog1
6288                         (nnheader-header-value)
6289                       (setq ref
6290                             (buffer-substring
6291                              (progn
6292                                (end-of-line)
6293                                (search-backward ">" end t)
6294                                (1+ (point)))
6295                              (progn
6296                                (search-backward "<" end t)
6297                                (point))))))
6298                 ;; Get the references from the in-reply-to header if there
6299                 ;; were no references and the in-reply-to header looks
6300                 ;; promising.
6301                 (if (and (search-forward "\nin-reply-to:" nil t)
6302                          (setq in-reply-to (nnheader-header-value))
6303                          (string-match "<[^>]+>" in-reply-to))
6304                     (let (ref2)
6305                       (setq ref (substring in-reply-to (match-beginning 0)
6306                                            (match-end 0)))
6307                       (while (string-match "<[^>]+>" in-reply-to (match-end 0))
6308                         (setq ref2 (substring in-reply-to (match-beginning 0)
6309                                               (match-end 0)))
6310                         (when (> (length ref2) (length ref))
6311                           (setq ref ref2)))
6312                       ref)
6313                   (setq ref nil))))
6314             ;; Chars.
6315             (progn
6316               (goto-char p)
6317               (if (search-forward "\nchars: " nil t)
6318                   (if (numberp (setq chars (ignore-errors (read cur))))
6319                       chars -1)
6320                 -1))
6321             ;; Lines.
6322             (progn
6323               (goto-char p)
6324               (if (search-forward "\nlines: " nil t)
6325                   (if (numberp (setq lines (ignore-errors (read cur))))
6326                       lines -1)
6327                 -1))
6328             ;; Xref.
6329             (progn
6330               (goto-char p)
6331               (and (search-forward "\nxref:" nil t)
6332                    (nnheader-header-value)))
6333             ;; Extra.
6334             (when gnus-extra-headers
6335               (let ((extra gnus-extra-headers)
6336                     out)
6337                 (while extra
6338                   (goto-char p)
6339                   (when (search-forward
6340                          (concat "\n" (symbol-name (car extra)) ":") nil t)
6341                     (push (cons (car extra) (nnheader-header-value))
6342                           out))
6343                   (pop extra))
6344                 out))))
6345           (when (equal id ref)
6346             (setq ref nil))
6347
6348           (when gnus-alter-header-function
6349             (funcall gnus-alter-header-function header)
6350             (setq id (mail-header-id header)
6351                   ref (gnus-parent-id (mail-header-references header))))
6352
6353           (when (setq header
6354                       (gnus-dependencies-add-header
6355                        header dependencies force-new))
6356             (push header headers))
6357           (goto-char (point-max))
6358           (widen))
6359         (nreverse headers)))))
6360
6361 ;; Goes through the xover lines and returns a list of vectors
6362 (defun gnus-get-newsgroup-headers-xover (sequence &optional
6363                                                   force-new dependencies
6364                                                   group also-fetch-heads)
6365   "Parse the news overview data in the server buffer.
6366 Return a list of headers that match SEQUENCE (see
6367 `nntp-retrieve-headers')."
6368   ;; Get the Xref when the users reads the articles since most/some
6369   ;; NNTP servers do not include Xrefs when using XOVER.
6370   (setq gnus-article-internal-prepare-hook '(gnus-article-get-xrefs))
6371   (let ((mail-parse-charset gnus-newsgroup-charset)
6372         (mail-parse-ignored-charsets gnus-newsgroup-ignored-charsets)
6373         (cur nntp-server-buffer)
6374         (dependencies (or dependencies gnus-newsgroup-dependencies))
6375         (allp (cond
6376                ((eq gnus-read-all-available-headers t)
6377                 t)
6378                ((and (stringp gnus-read-all-available-headers)
6379                      group)
6380                 (string-match gnus-read-all-available-headers group))
6381                (t
6382                 nil)))
6383         number headers header)
6384     (with-current-buffer nntp-server-buffer
6385       (subst-char-in-region (point-min) (point-max) ?\r ?  t)
6386       ;; Allow the user to mangle the headers before parsing them.
6387       (gnus-run-hooks 'gnus-parse-headers-hook)
6388       (goto-char (point-min))
6389       (gnus-parse-without-error
6390         (while (and (or sequence allp)
6391                     (not (eobp)))
6392           (setq number (read cur))
6393           (when (not allp)
6394             (while (and sequence
6395                         (< (car sequence) number))
6396               (setq sequence (cdr sequence))))
6397           (when (and (or allp
6398                          (and sequence
6399                               (eq number (car sequence))))
6400                      (progn
6401                        (setq sequence (cdr sequence))
6402                        (setq header (inline
6403                                       (gnus-nov-parse-line
6404                                        number dependencies force-new)))))
6405             (push header headers))
6406           (forward-line 1)))
6407       ;; A common bug in inn is that if you have posted an article and
6408       ;; then retrieves the active file, it will answer correctly --
6409       ;; the new article is included.  However, a NOV entry for the
6410       ;; article may not have been generated yet, so this may fail.
6411       ;; We work around this problem by retrieving the last few
6412       ;; headers using HEAD.
6413       (if (or (not also-fetch-heads)
6414               (not sequence))
6415           ;; We (probably) got all the headers.
6416           (nreverse headers)
6417         (let ((gnus-nov-is-evil t))
6418           (nconc
6419            (nreverse headers)
6420            (when (eq (gnus-retrieve-headers sequence group) 'headers)
6421              (gnus-get-newsgroup-headers))))))))
6422
6423 (defun gnus-article-get-xrefs ()
6424   "Fill in the Xref value in `gnus-current-headers', if necessary.
6425 This is meant to be called in `gnus-article-internal-prepare-hook'."
6426   (let ((headers (with-current-buffer gnus-summary-buffer
6427                    gnus-current-headers)))
6428     (or (not gnus-use-cross-reference)
6429         (not headers)
6430         (and (mail-header-xref headers)
6431              (not (string= (mail-header-xref headers) "")))
6432         (let ((case-fold-search t)
6433               xref)
6434           (save-restriction
6435             (nnheader-narrow-to-headers)
6436             (goto-char (point-min))
6437             (when (or (and (not (eobp))
6438                            (eq (downcase (char-after)) ?x)
6439                            (looking-at "Xref:"))
6440                       (search-forward "\nXref:" nil t))
6441               (goto-char (1+ (match-end 0)))
6442               (setq xref (buffer-substring (point) (point-at-eol)))
6443               (mail-header-set-xref headers xref)))))))
6444
6445 (defun gnus-summary-insert-subject (id &optional old-header use-old-header)
6446   "Find article ID and insert the summary line for that article.
6447 OLD-HEADER can either be a header or a line number to insert
6448 the subject line on."
6449   (let* ((line (and (numberp old-header) old-header))
6450          (old-header (and (vectorp old-header) old-header))
6451          (header (cond ((and old-header use-old-header)
6452                         old-header)
6453                        ((and (numberp id)
6454                              (gnus-number-to-header id))
6455                         (gnus-number-to-header id))
6456                        (t
6457                         (gnus-read-header id))))
6458          (number (and (numberp id) id))
6459          d)
6460     (when header
6461       ;; Rebuild the thread that this article is part of and go to the
6462       ;; article we have fetched.
6463       (when (and (not gnus-show-threads)
6464                  old-header)
6465         (when (and number
6466                    (setq d (gnus-data-find (mail-header-number old-header))))
6467           (goto-char (gnus-data-pos d))
6468           (gnus-data-remove
6469            number
6470            (- (point-at-bol)
6471               (prog1
6472                   (1+ (point-at-eol))
6473                 (gnus-delete-line))))))
6474       ;; Remove list identifiers from subject.
6475       (when gnus-list-identifiers
6476         (let ((gnus-newsgroup-headers (list header)))
6477           (gnus-summary-remove-list-identifiers)))
6478       (when old-header
6479         (mail-header-set-number header (mail-header-number old-header)))
6480       (setq gnus-newsgroup-sparse
6481             (delq (setq number (mail-header-number header))
6482                   gnus-newsgroup-sparse))
6483       (setq gnus-newsgroup-ancient (delq number gnus-newsgroup-ancient))
6484       (push number gnus-newsgroup-limit)
6485       (gnus-rebuild-thread (mail-header-id header) line)
6486       (gnus-summary-goto-subject number nil t))
6487     (when (and (numberp number)
6488                (> number 0))
6489       ;; We have to update the boundaries even if we can't fetch the
6490       ;; article if ID is a number -- so that the next `P' or `N'
6491       ;; command will fetch the previous (or next) article even
6492       ;; if the one we tried to fetch this time has been canceled.
6493       (when (> number gnus-newsgroup-end)
6494         (setq gnus-newsgroup-end number))
6495       (when (< number gnus-newsgroup-begin)
6496         (setq gnus-newsgroup-begin number))
6497       (setq gnus-newsgroup-unselected
6498             (delq number gnus-newsgroup-unselected)))
6499     ;; Report back a success?
6500     (and header (mail-header-number header))))
6501
6502 ;;; Process/prefix in the summary buffer
6503
6504 (defun gnus-summary-work-articles (n)
6505   "Return a list of articles to be worked upon.
6506 The prefix argument, the list of process marked articles, and the
6507 current article will be taken into consideration."
6508   (with-current-buffer gnus-summary-buffer
6509     (cond
6510      (n
6511       ;; A numerical prefix has been given.
6512       (setq n (prefix-numeric-value n))
6513       (let ((backward (< n 0))
6514             (n (abs (prefix-numeric-value n)))
6515             articles article)
6516         (save-excursion
6517           (while
6518               (and (> n 0)
6519                    (push (setq article (gnus-summary-article-number))
6520                          articles)
6521                    (if backward
6522                        (gnus-summary-find-prev nil article)
6523                      (gnus-summary-find-next nil article)))
6524             (decf n)))
6525         (nreverse articles)))
6526      ((and (gnus-region-active-p) (mark))
6527       (message "region active")
6528       ;; Work on the region between point and mark.
6529       (let ((max (max (point) (mark)))
6530             articles article)
6531         (save-excursion
6532           (goto-char (min (point) (mark)))
6533           (while
6534               (and
6535                (push (setq article (gnus-summary-article-number)) articles)
6536                (gnus-summary-find-next nil article)
6537                (< (point) max)))
6538           (nreverse articles))))
6539      (gnus-newsgroup-processable
6540       ;; There are process-marked articles present.
6541       ;; Save current state.
6542       (gnus-summary-save-process-mark)
6543       ;; Return the list.
6544       (reverse gnus-newsgroup-processable))
6545      (t
6546       ;; Just return the current article.
6547       (list (gnus-summary-article-number))))))
6548
6549 (defmacro gnus-summary-iterate (arg &rest forms)
6550   "Iterate over the process/prefixed articles and do FORMS.
6551 ARG is the interactive prefix given to the command.  FORMS will be
6552 executed with point over the summary line of the articles."
6553   (let ((articles (make-symbol "gnus-summary-iterate-articles")))
6554     `(let ((,articles (gnus-summary-work-articles ,arg)))
6555        (while ,articles
6556          (gnus-summary-goto-subject (car ,articles))
6557          ,@forms
6558          (pop ,articles)))))
6559
6560 (put 'gnus-summary-iterate 'lisp-indent-function 1)
6561 (put 'gnus-summary-iterate 'edebug-form-spec '(form body))
6562
6563 (defun gnus-summary-save-process-mark ()
6564   "Push the current set of process marked articles on the stack."
6565   (interactive)
6566   (push (copy-sequence gnus-newsgroup-processable)
6567         gnus-newsgroup-process-stack))
6568
6569 (defun gnus-summary-kill-process-mark ()
6570   "Push the current set of process marked articles on the stack and unmark."
6571   (interactive)
6572   (gnus-summary-save-process-mark)
6573   (gnus-summary-unmark-all-processable))
6574
6575 (defun gnus-summary-yank-process-mark ()
6576   "Pop the last process mark state off the stack and restore it."
6577   (interactive)
6578   (unless gnus-newsgroup-process-stack
6579     (error "Empty mark stack"))
6580   (gnus-summary-process-mark-set (pop gnus-newsgroup-process-stack)))
6581
6582 (defun gnus-summary-process-mark-set (set)
6583   "Make SET into the current process marked articles."
6584   (gnus-summary-unmark-all-processable)
6585   (mapc 'gnus-summary-set-process-mark set))
6586
6587 ;;; Searching and stuff
6588
6589 (defun gnus-summary-search-group (&optional backward use-level)
6590   "Search for next unread newsgroup.
6591 If optional argument BACKWARD is non-nil, search backward instead."
6592   (with-current-buffer gnus-group-buffer
6593     (when (gnus-group-search-forward
6594            backward nil (if use-level (gnus-group-group-level) nil))
6595       (gnus-group-group-name))))
6596
6597 (defun gnus-summary-best-group (&optional exclude-group)
6598   "Find the name of the best unread group.
6599 If EXCLUDE-GROUP, do not go to this group."
6600   (with-current-buffer gnus-group-buffer
6601     (save-excursion
6602       (gnus-group-best-unread-group exclude-group))))
6603
6604 (defun gnus-summary-find-next (&optional unread article backward)
6605   (if backward
6606       (gnus-summary-find-prev unread article)
6607     (let* ((dummy (gnus-summary-article-intangible-p))
6608            (article (or article (gnus-summary-article-number)))
6609            (data (gnus-data-find-list article))
6610            result)
6611       (when (and (not dummy)
6612                  (or (not gnus-summary-check-current)
6613                      (not unread)
6614                      (not (gnus-data-unread-p (car data)))))
6615         (setq data (cdr data)))
6616       (when (setq result
6617                   (if unread
6618                       (progn
6619                         (while data
6620                           (unless (memq (gnus-data-number (car data))
6621                                         (cond
6622                                          ((eq gnus-auto-goto-ignores
6623                                               'always-undownloaded)
6624                                           gnus-newsgroup-undownloaded)
6625                                          (gnus-plugged
6626                                           nil)
6627                                          ((eq gnus-auto-goto-ignores
6628                                               'unfetched)
6629                                           gnus-newsgroup-unfetched)
6630                                          ((eq gnus-auto-goto-ignores
6631                                               'undownloaded)
6632                                           gnus-newsgroup-undownloaded)))
6633                             (when (gnus-data-unread-p (car data))
6634                               (setq result (car data)
6635                                     data nil)))
6636                           (setq data (cdr data)))
6637                         result)
6638                     (car data)))
6639         (goto-char (gnus-data-pos result))
6640         (gnus-data-number result)))))
6641
6642 (defun gnus-summary-find-prev (&optional unread article)
6643   (let* ((eobp (eobp))
6644          (article (or article (gnus-summary-article-number)))
6645          (data (gnus-data-find-list article (gnus-data-list 'rev)))
6646          result)
6647     (when (and (not eobp)
6648                (or (not gnus-summary-check-current)
6649                    (not unread)
6650                    (not (gnus-data-unread-p (car data)))))
6651       (setq data (cdr data)))
6652     (when (setq result
6653                 (if unread
6654                     (progn
6655                       (while data
6656                         (unless (memq (gnus-data-number (car data))
6657                                       (cond
6658                                        ((eq gnus-auto-goto-ignores
6659                                             'always-undownloaded)
6660                                         gnus-newsgroup-undownloaded)
6661                                        (gnus-plugged
6662                                         nil)
6663                                        ((eq gnus-auto-goto-ignores
6664                                             'unfetched)
6665                                         gnus-newsgroup-unfetched)
6666                                        ((eq gnus-auto-goto-ignores
6667                                             'undownloaded)
6668                                         gnus-newsgroup-undownloaded)))
6669                           (when (gnus-data-unread-p (car data))
6670                             (setq result (car data)
6671                                   data nil)))
6672                         (setq data (cdr data)))
6673                       result)
6674                   (car data)))
6675       (goto-char (gnus-data-pos result))
6676       (gnus-data-number result))))
6677
6678 (defun gnus-summary-find-subject (subject &optional unread backward article)
6679   (let* ((simp-subject (gnus-simplify-subject-fully subject))
6680          (article (or article (gnus-summary-article-number)))
6681          (articles (gnus-data-list backward))
6682          (arts (gnus-data-find-list article articles))
6683          result)
6684     (when (or (not gnus-summary-check-current)
6685               (not unread)
6686               (not (gnus-data-unread-p (car arts))))
6687       (setq arts (cdr arts)))
6688     (while arts
6689       (and (or (not unread)
6690                (gnus-data-unread-p (car arts)))
6691            (vectorp (gnus-data-header (car arts)))
6692            (gnus-subject-equal
6693             simp-subject (mail-header-subject (gnus-data-header (car arts))) t)
6694            (setq result (car arts)
6695                  arts nil))
6696       (setq arts (cdr arts)))
6697     (and result
6698          (goto-char (gnus-data-pos result))
6699          (gnus-data-number result))))
6700
6701 (defun gnus-summary-search-forward (&optional unread subject backward)
6702   "Search forward for an article.
6703 If UNREAD, look for unread articles.  If SUBJECT, look for
6704 articles with that subject.  If BACKWARD, search backward instead."
6705   (cond (subject (gnus-summary-find-subject subject unread backward))
6706         (backward (gnus-summary-find-prev unread))
6707         (t (gnus-summary-find-next unread))))
6708
6709 (defun gnus-recenter (&optional n)
6710   "Center point in window and redisplay frame.
6711 Also do horizontal recentering."
6712   (interactive "P")
6713   (when (and gnus-auto-center-summary
6714              (not (eq gnus-auto-center-summary 'vertical)))
6715     (gnus-horizontal-recenter))
6716   (if (fboundp 'recenter-top-bottom)
6717       (recenter-top-bottom n)
6718     (recenter n)))
6719
6720 (put 'gnus-recenter 'isearch-scroll t)
6721
6722 (defun gnus-forward-line-ignore-invisible (n)
6723   "Move N lines forward (backward if N is negative).
6724 Like forward-line, but skip over (and don't count) invisible lines."
6725   (let (done)
6726     (while (and (> n 0) (not done))
6727       ;; If the following character is currently invisible,
6728       ;; skip all characters with that same `invisible' property value.
6729       (while (gnus-invisible-p (point))
6730         (goto-char (gnus-next-char-property-change (point))))
6731       (forward-line 1)
6732       (if (eobp)
6733           (setq done t)
6734         (setq n (1- n))))
6735     (while (and (< n 0) (not done))
6736       (forward-line -1)
6737       (if (bobp) (setq done t)
6738         (setq n (1+ n))
6739         (while (and (not (bobp)) (gnus-invisible-p (1- (point))))
6740           (goto-char (gnus-previous-char-property-change (point))))))))
6741
6742 (defun gnus-summary-recenter ()
6743   "Center point in the summary window.
6744 If `gnus-auto-center-summary' is nil, or the article buffer isn't
6745 displayed, no centering will be performed."
6746   ;; Suggested by earle@mahendo.JPL.NASA.GOV (Greg Earle).
6747   ;; Recenter only when requested.  Suggested by popovich@park.cs.columbia.edu.
6748   (interactive)
6749   ;; The user has to want it.
6750   (when gnus-auto-center-summary
6751     (let* ((top (cond ((< (window-height) 4) 0)
6752                       ((< (window-height) 7) 1)
6753                       (t (if (numberp gnus-auto-center-summary)
6754                              gnus-auto-center-summary
6755                            (/ (1- (window-height)) 2)))))
6756            (height (1- (window-height)))
6757            (bottom (save-excursion
6758                      (goto-char (point-max))
6759                      (gnus-forward-line-ignore-invisible (- height))
6760                      (point)))
6761            (window (get-buffer-window (current-buffer))))
6762       (when (get-buffer-window gnus-article-buffer)
6763         ;; Only do recentering when the article buffer is displayed,
6764         ;; Set the window start to either `bottom', which is the biggest
6765         ;; possible valid number, or the second line from the top,
6766         ;; whichever is the least.
6767         (let ((top-pos (save-excursion
6768                          (gnus-forward-line-ignore-invisible (- top))
6769                          (point))))
6770           (if (> bottom top-pos)
6771               ;; Keep the second line from the top visible
6772               (set-window-start window top-pos)
6773             ;; Try to keep the bottom line visible; if it's partially
6774             ;; obscured, either scroll one more line to make it fully
6775             ;; visible, or revert to using TOP-POS.
6776             (save-excursion
6777               (goto-char (point-max))
6778               (gnus-forward-line-ignore-invisible -1)
6779               (let ((last-line-start (point)))
6780                 (goto-char bottom)
6781                 (set-window-start window (point) t)
6782                 (when (not (pos-visible-in-window-p last-line-start window))
6783                   (gnus-forward-line-ignore-invisible 1)
6784                   (set-window-start window (min (point) top-pos) t)))))))
6785       ;; Do horizontal recentering while we're at it.
6786       (when (and (get-buffer-window (current-buffer) t)
6787                  (not (eq gnus-auto-center-summary 'vertical)))
6788         (let ((selected (selected-window)))
6789           (select-window (get-buffer-window (current-buffer) t))
6790           (gnus-summary-position-point)
6791           (gnus-horizontal-recenter)
6792           (select-window selected))))))
6793
6794 (defun gnus-summary-jump-to-group (newsgroup)
6795   "Move point to NEWSGROUP in group mode buffer."
6796   ;; Keep update point of group mode buffer if visible.
6797   (if (eq (current-buffer) (get-buffer gnus-group-buffer))
6798       (save-window-excursion
6799         ;; Take care of tree window mode.
6800         (when (get-buffer-window gnus-group-buffer)
6801           (pop-to-buffer gnus-group-buffer))
6802         (gnus-group-jump-to-group newsgroup))
6803     (save-excursion
6804       ;; Take care of tree window mode.
6805       (if (get-buffer-window gnus-group-buffer 0)
6806           (pop-to-buffer gnus-group-buffer)
6807         (set-buffer gnus-group-buffer))
6808       (gnus-group-jump-to-group newsgroup))))
6809
6810 ;; This function returns a list of article numbers based on the
6811 ;; difference between the ranges of read articles in this group and
6812 ;; the range of active articles.
6813 (defun gnus-list-of-unread-articles (group)
6814   (let* ((read (gnus-info-read (gnus-get-info group)))
6815          (active (or (gnus-active group) (gnus-activate-group group)))
6816          (last (or (cdr active)
6817                    (error "Group %s couldn't be activated " group)))
6818          (bottom (if gnus-newsgroup-maximum-articles
6819                      (max (car active)
6820                           (- last gnus-newsgroup-maximum-articles -1))
6821                    (car active)))
6822          first nlast unread)
6823     ;; If none are read, then all are unread.
6824     (if (not read)
6825         (setq first bottom)
6826       ;; If the range of read articles is a single range, then the
6827       ;; first unread article is the article after the last read
6828       ;; article.  Sounds logical, doesn't it?
6829       (if (and (not (listp (cdr read)))
6830                (or (< (car read) bottom)
6831                    (progn (setq read (list read))
6832                           nil)))
6833           (setq first (max bottom (1+ (cdr read))))
6834         ;; `read' is a list of ranges.
6835         (when (/= (setq nlast (or (and (numberp (car read)) (car read))
6836                                   (caar read)))
6837                   1)
6838           (setq first bottom))
6839         (while read
6840           (when first
6841             (while (< first nlast)
6842               (setq unread (cons first unread)
6843                     first (1+ first))))
6844           (setq first (1+ (if (atom (car read)) (car read) (cdar read))))
6845           (setq nlast (if (atom (cadr read)) (cadr read) (caadr read)))
6846           (setq read (cdr read)))))
6847     ;; And add the last unread articles.
6848     (while (<= first last)
6849       (setq unread (cons first unread)
6850             first (1+ first)))
6851     ;; Return the list of unread articles.
6852     (delq 0 (nreverse unread))))
6853
6854 (defun gnus-list-of-read-articles (group)
6855   "Return a list of unread, unticked and non-dormant articles."
6856   (let* ((info (gnus-get-info group))
6857          (marked (gnus-info-marks info))
6858          (active (gnus-active group)))
6859     (and info active
6860          (gnus-list-range-difference
6861           (gnus-list-range-difference
6862            (gnus-sorted-complement
6863             (gnus-uncompress-range
6864              (if gnus-newsgroup-maximum-articles
6865                  (cons (max (car active)
6866                             (- (cdr active)
6867                                gnus-newsgroup-maximum-articles
6868                                -1))
6869                        (cdr active))
6870                active))
6871             (gnus-list-of-unread-articles group))
6872            (cdr (assq 'dormant marked)))
6873           (cdr (assq 'tick marked))))))
6874
6875 ;; This function returns a sequence of article numbers based on the
6876 ;; difference between the ranges of read articles in this group and
6877 ;; the range of active articles.
6878 (defun gnus-sequence-of-unread-articles (group)
6879   (let* ((read (gnus-info-read (gnus-get-info group)))
6880          (active (or (gnus-active group) (gnus-activate-group group)))
6881          (last (cdr active))
6882          (bottom (if gnus-newsgroup-maximum-articles
6883                      (max (car active)
6884                           (- last gnus-newsgroup-maximum-articles -1))
6885                    (car active)))
6886          first nlast unread)
6887     ;; If none are read, then all are unread.
6888     (if (not read)
6889         (setq first bottom)
6890       ;; If the range of read articles is a single range, then the
6891       ;; first unread article is the article after the last read
6892       ;; article.  Sounds logical, doesn't it?
6893       (if (and (not (listp (cdr read)))
6894                (or (< (car read) bottom)
6895                    (progn (setq read (list read))
6896                           nil)))
6897           (setq first (max bottom (1+ (cdr read))))
6898         ;; `read' is a list of ranges.
6899         (when (/= (setq nlast (or (and (numberp (car read)) (car read))
6900                                   (caar read)))
6901                   1)
6902           (setq first bottom))
6903         (while read
6904           (when first
6905             (push (cons first nlast) unread))
6906           (setq first (1+ (if (atom (car read)) (car read) (cdar read))))
6907           (setq nlast (if (atom (cadr read)) (cadr read) (caadr read)))
6908           (setq read (cdr read)))))
6909     ;; And add the last unread articles.
6910     (cond ((not (and first last))
6911            nil)
6912           ((< first last)
6913            (push (cons first last) unread))
6914           ((= first last)
6915            (push first unread)))
6916     ;; Return the sequence of unread articles.
6917     (delq 0 (nreverse unread))))
6918
6919 ;; Various summary commands
6920
6921 (defun gnus-summary-select-article-buffer ()
6922   "Reconfigure windows to show article buffer."
6923   (interactive)
6924   (if (not (gnus-buffer-live-p gnus-article-buffer))
6925       (error "There is no article buffer for this summary buffer")
6926     (gnus-configure-windows 'article)
6927     (select-window (get-buffer-window gnus-article-buffer))))
6928
6929 (defun gnus-summary-universal-argument (arg)
6930   "Perform any operation on all articles that are process/prefixed."
6931   (interactive "P")
6932   (let ((articles (gnus-summary-work-articles arg))
6933         func article)
6934     (if (eq
6935          (setq
6936           func
6937           (key-binding
6938            (read-key-sequence
6939             (substitute-command-keys
6940              "\\<gnus-summary-mode-map>\\[gnus-summary-universal-argument]"))))
6941          'undefined)
6942         (gnus-error 1 "Undefined key")
6943       (save-excursion
6944         (while articles
6945           (gnus-summary-goto-subject (setq article (pop articles)))
6946           (let (gnus-newsgroup-processable)
6947             (command-execute func))
6948           (gnus-summary-remove-process-mark article)))))
6949   (gnus-summary-position-point))
6950
6951 (defun gnus-summary-toggle-truncation (&optional arg)
6952   "Toggle truncation of summary lines.
6953 With ARG, turn line truncation on if ARG is positive."
6954   (interactive "P")
6955   (setq truncate-lines
6956         (if (null arg) (not truncate-lines)
6957           (> (prefix-numeric-value arg) 0)))
6958   (redraw-display))
6959
6960 (defun gnus-summary-find-for-reselect ()
6961   "Return the number of an article to stay on across a reselect.
6962 The current article is considered, then following articles, then previous
6963 articles.  An article is sought which is not cancelled and isn't a temporary
6964 insertion from another group.  If there's no such then return a dummy 0."
6965   (let (found)
6966     (dolist (rev '(nil t))
6967       (unless found      ; don't demand the reverse list if we don't need it
6968         (let ((data (gnus-data-find-list
6969                      (gnus-summary-article-number) (gnus-data-list rev))))
6970           (while (and data (not found))
6971             (if (and (< 0 (gnus-data-number (car data)))
6972                      (not (eq gnus-canceled-mark (gnus-data-mark (car data)))))
6973                 (setq found (gnus-data-number (car data))))
6974             (setq data (cdr data))))))
6975     (or found 0)))
6976
6977 (defun gnus-summary-reselect-current-group (&optional all rescan)
6978   "Exit and then reselect the current newsgroup.
6979 The prefix argument ALL means to select all articles."
6980   (interactive "P")
6981   (when (gnus-ephemeral-group-p gnus-newsgroup-name)
6982     (error "Ephemeral groups can't be reselected"))
6983   (let ((current-subject (gnus-summary-find-for-reselect))
6984         (group gnus-newsgroup-name))
6985     (setq gnus-newsgroup-begin nil)
6986     (gnus-summary-exit nil 'leave-hidden)
6987     ;; We have to adjust the point of group mode buffer because
6988     ;; point was moved to the next unread newsgroup by exiting.
6989     (gnus-summary-jump-to-group group)
6990     (when rescan
6991       (save-excursion
6992         (gnus-group-get-new-news-this-group 1)))
6993     (gnus-group-read-group all t)
6994     (gnus-summary-goto-subject current-subject nil t)))
6995
6996 (defun gnus-summary-rescan-group (&optional all)
6997   "Exit the newsgroup, ask for new articles, and select the newsgroup."
6998   (interactive "P")
6999   (gnus-summary-reselect-current-group all t))
7000
7001 (defun gnus-summary-update-info (&optional non-destructive)
7002   (save-excursion
7003     (let ((group gnus-newsgroup-name))
7004       (when group
7005         (when gnus-newsgroup-kill-headers
7006           (setq gnus-newsgroup-killed
7007                 (gnus-compress-sequence
7008                  (gnus-sorted-union
7009                   (gnus-list-range-intersection
7010                    gnus-newsgroup-unselected gnus-newsgroup-killed)
7011                   gnus-newsgroup-unreads)
7012                  t)))
7013         (unless (listp (cdr gnus-newsgroup-killed))
7014           (setq gnus-newsgroup-killed (list gnus-newsgroup-killed)))
7015         (let ((headers gnus-newsgroup-headers))
7016           ;; Set the new ranges of read articles.
7017           (with-current-buffer gnus-group-buffer
7018             (gnus-undo-force-boundary))
7019           (gnus-update-read-articles
7020            group (gnus-sorted-union
7021                   gnus-newsgroup-unreads gnus-newsgroup-unselected))
7022           ;; Set the current article marks.
7023           (let ((gnus-newsgroup-scored
7024                  (if (and (not gnus-save-score)
7025                           (not non-destructive))
7026                      nil
7027                    gnus-newsgroup-scored)))
7028             (save-excursion
7029               (gnus-update-marks)))
7030           ;; Do the cross-ref thing.
7031           (when gnus-use-cross-reference
7032             (gnus-mark-xrefs-as-read group headers gnus-newsgroup-unreads))
7033           ;; Do not switch windows but change the buffer to work.
7034           (set-buffer gnus-group-buffer)
7035           (unless (gnus-ephemeral-group-p group)
7036             (gnus-group-update-group group)))))))
7037
7038 (defun gnus-summary-save-newsrc (&optional force)
7039   "Save the current number of read/marked articles in the dribble buffer.
7040 The dribble buffer will then be saved.
7041 If FORCE (the prefix), also save the .newsrc file(s)."
7042   (interactive "P")
7043   (gnus-summary-update-info t)
7044   (if force
7045       (gnus-save-newsrc-file)
7046     (gnus-dribble-save)))
7047
7048 (declare-function gnus-cache-write-active "gnus-cache" (&optional force))
7049
7050 (defun gnus-summary-exit (&optional temporary leave-hidden)
7051   "Exit reading current newsgroup, and then return to group selection mode.
7052 `gnus-exit-group-hook' is called with no arguments if that value is non-nil."
7053   (interactive)
7054   (gnus-set-global-variables)
7055   (when (gnus-buffer-live-p gnus-article-buffer)
7056     (with-current-buffer gnus-article-buffer
7057       (mm-destroy-parts gnus-article-mime-handles)
7058       ;; Set it to nil for safety reason.
7059       (setq gnus-article-mime-handle-alist nil)
7060       (setq gnus-article-mime-handles nil)))
7061   (gnus-kill-save-kill-buffer)
7062   (gnus-async-halt-prefetch)
7063   (let* ((group gnus-newsgroup-name)
7064          (quit-config (gnus-group-quit-config gnus-newsgroup-name))
7065          (gnus-group-is-exiting-p t)
7066          (mode major-mode)
7067          (group-point nil)
7068          (buf (current-buffer)))
7069     (unless quit-config
7070       ;; Do adaptive scoring, and possibly save score files.
7071       (when gnus-newsgroup-adaptive
7072         (gnus-score-adaptive))
7073       (when gnus-use-scoring
7074         (gnus-score-save)))
7075     (gnus-run-hooks 'gnus-summary-prepare-exit-hook)
7076     ;; If we have several article buffers, we kill them at exit.
7077     (unless gnus-single-article-buffer
7078       (when (gnus-buffer-live-p gnus-article-buffer)
7079         (with-current-buffer gnus-article-buffer
7080           ;; Don't kill sticky article buffers
7081           (unless (eq major-mode 'gnus-sticky-article-mode)
7082             (gnus-kill-buffer gnus-article-buffer)
7083             (setq gnus-article-current nil))))
7084       (gnus-kill-buffer gnus-original-article-buffer))
7085     (when gnus-use-cache
7086       (gnus-cache-possibly-remove-articles)
7087       (gnus-cache-save-buffers))
7088     (gnus-async-prefetch-remove-group group)
7089     (when gnus-suppress-duplicates
7090       (gnus-dup-enter-articles))
7091     (when gnus-use-trees
7092       (gnus-tree-close group))
7093     (when gnus-use-cache
7094       (gnus-cache-write-active))
7095     ;; Remove entries for this group.
7096     (nnmail-purge-split-history (gnus-group-real-name group))
7097     ;; Make all changes in this group permanent.
7098     (unless quit-config
7099       (gnus-run-hooks 'gnus-exit-group-hook)
7100       (gnus-summary-update-info))
7101     (gnus-close-group group)
7102     ;; Make sure where we were, and go to next newsgroup.
7103     (set-buffer gnus-group-buffer)
7104     (unless quit-config
7105       (gnus-group-jump-to-group group))
7106     (gnus-run-hooks 'gnus-summary-exit-hook)
7107     (unless (or quit-config
7108                 (not gnus-summary-next-group-on-exit)
7109                 ;; If this group has disappeared from the summary
7110                 ;; buffer, don't skip forwards.
7111                 (not (string= group (gnus-group-group-name))))
7112       (gnus-group-next-unread-group 1))
7113     (setq group-point (point))
7114     (if temporary
7115         nil                             ;Nothing to do.
7116       (set-buffer buf)
7117       (if (not gnus-kill-summary-on-exit)
7118           (progn
7119             (gnus-deaden-summary)
7120             (setq mode nil))
7121         ;; We set all buffer-local variables to nil.  It is unclear why
7122         ;; this is needed, but if we don't, buffer-local variables are
7123         ;; not garbage-collected, it seems.  This would the lead to en
7124         ;; ever-growing Emacs.
7125         (gnus-summary-clear-local-variables)
7126         (let ((gnus-summary-local-variables gnus-newsgroup-variables))
7127           (gnus-summary-clear-local-variables))
7128         (when (get-buffer gnus-article-buffer)
7129           (bury-buffer gnus-article-buffer))
7130         ;; Return to group mode buffer.
7131         (when (eq mode 'gnus-summary-mode)
7132           (gnus-kill-buffer buf)))
7133       (setq gnus-current-select-method gnus-select-method)
7134       (set-buffer gnus-group-buffer)
7135       (if quit-config
7136           (gnus-handle-ephemeral-exit quit-config)
7137         (goto-char group-point)
7138         ;; If gnus-group-buffer is already displayed, make sure we also move
7139         ;; the cursor in the window that displays it.
7140         (let ((win (get-buffer-window (current-buffer) 0)))
7141           (if win (set-window-point win (point))))
7142         (unless leave-hidden
7143           (gnus-configure-windows 'group 'force)))
7144       ;; Clear the current group name.
7145       (unless quit-config
7146         (setq gnus-newsgroup-name nil)))))
7147
7148 (defalias 'gnus-summary-quit 'gnus-summary-exit-no-update)
7149 (defun gnus-summary-exit-no-update (&optional no-questions)
7150   "Quit reading current newsgroup without updating read article info."
7151   (interactive)
7152   (let* ((group gnus-newsgroup-name)
7153          (gnus-group-is-exiting-p t)
7154          (gnus-group-is-exiting-without-update-p t)
7155          (quit-config (gnus-group-quit-config group)))
7156     (when (or no-questions
7157               gnus-expert-user
7158               (gnus-y-or-n-p "Discard changes to this group and exit? "))
7159       (gnus-async-halt-prefetch)
7160       (run-hooks 'gnus-summary-prepare-exit-hook)
7161       (when (gnus-buffer-live-p gnus-article-buffer)
7162         (with-current-buffer gnus-article-buffer
7163           (mm-destroy-parts gnus-article-mime-handles)
7164           ;; Set it to nil for safety reason.
7165           (setq gnus-article-mime-handle-alist nil)
7166           (setq gnus-article-mime-handles nil)))
7167       ;; If we have several article buffers, we kill them at exit.
7168       (unless gnus-single-article-buffer
7169         (gnus-kill-buffer gnus-article-buffer)
7170         (gnus-kill-buffer gnus-original-article-buffer)
7171         (setq gnus-article-current nil))
7172       (if (not gnus-kill-summary-on-exit)
7173           (gnus-deaden-summary)
7174         (gnus-close-group group)
7175         (gnus-summary-clear-local-variables)
7176         (let ((gnus-summary-local-variables gnus-newsgroup-variables))
7177           (gnus-summary-clear-local-variables))
7178         (gnus-kill-buffer gnus-summary-buffer))
7179       (unless gnus-single-article-buffer
7180         (setq gnus-article-current nil))
7181       (when gnus-use-trees
7182         (gnus-tree-close group))
7183       (gnus-async-prefetch-remove-group group)
7184       (when (get-buffer gnus-article-buffer)
7185         (bury-buffer gnus-article-buffer))
7186       ;; Return to the group buffer.
7187       (gnus-configure-windows 'group 'force)
7188       ;; Clear the current group name.
7189       (setq gnus-newsgroup-name nil)
7190       (unless (gnus-ephemeral-group-p group)
7191         (gnus-group-update-group group))
7192       (when (equal (gnus-group-group-name) group)
7193         (gnus-group-next-unread-group 1))
7194       (when quit-config
7195         (gnus-handle-ephemeral-exit quit-config)))))
7196
7197 (defun gnus-handle-ephemeral-exit (quit-config)
7198   "Handle movement when leaving an ephemeral group.
7199 The state which existed when entering the ephemeral is reset."
7200   (if (not (buffer-name (car quit-config)))
7201       (gnus-configure-windows 'group 'force)
7202     (set-buffer (car quit-config))
7203     (cond ((eq major-mode 'gnus-summary-mode)
7204            (gnus-set-global-variables))
7205           ((eq major-mode 'gnus-article-mode)
7206            (save-current-buffer
7207              ;; The `gnus-summary-buffer' variable may point
7208              ;; to the old summary buffer when using a single
7209              ;; article buffer.
7210              (unless (gnus-buffer-live-p gnus-summary-buffer)
7211                (set-buffer gnus-group-buffer))
7212              (set-buffer gnus-summary-buffer)
7213              (gnus-set-global-variables))))
7214     (if (or (eq (cdr quit-config) 'article)
7215             (eq (cdr quit-config) 'pick))
7216         (if (and (boundp 'gnus-pick-mode) (symbol-value 'gnus-pick-mode))
7217             (gnus-configure-windows 'pick 'force)
7218           (gnus-configure-windows (cdr quit-config) 'force))
7219       (gnus-configure-windows (cdr quit-config) 'force))
7220     (when (eq major-mode 'gnus-summary-mode)
7221       (if (memq gnus-auto-select-on-ephemeral-exit '(next-noselect
7222                                                      next-unread-noselect))
7223           (when (zerop (cond ((eq gnus-auto-select-on-ephemeral-exit
7224                                   'next-noselect)
7225                               (gnus-summary-next-subject 1 nil t))
7226                              ((eq gnus-auto-select-on-ephemeral-exit
7227                                   'next-unread-noselect)
7228                               (gnus-summary-next-subject 1 t t))))
7229             ;; Hide the article buffer which displays the article different
7230             ;; from the one that the cursor points to in the summary buffer.
7231             (gnus-configure-windows 'summary 'force))
7232         (cond ((eq gnus-auto-select-on-ephemeral-exit 'next)
7233                (gnus-summary-next-subject 1))
7234               ((eq gnus-auto-select-on-ephemeral-exit 'next-unread)
7235                (gnus-summary-next-subject 1 t))))
7236       (gnus-summary-recenter)
7237       (gnus-summary-position-point))))
7238
7239 ;;; Dead summaries.
7240
7241 (defvar gnus-dead-summary-mode-map
7242   (let ((map (make-keymap)))
7243     (suppress-keymap map)
7244     (substitute-key-definition 'undefined 'gnus-summary-wake-up-the-dead map)
7245     (dolist (key '("\C-d" "\r" "\177" [delete]))
7246       (define-key map key 'gnus-summary-wake-up-the-dead))
7247     (dolist (key '("q" "Q"))
7248       (define-key map key 'bury-buffer))
7249     map))
7250
7251 (define-minor-mode gnus-dead-summary-mode
7252   "Minor mode for Gnus summary buffers."
7253   :lighter " Dead" :keymap gnus-dead-summary-mode-map
7254   (unless (derived-mode-p 'gnus-summary-mode)
7255     (setq gnus-dead-summary-mode nil)))
7256
7257 (defun gnus-deaden-summary ()
7258   "Make the current summary buffer into a dead summary buffer."
7259   ;; Kill any previous dead summary buffer.
7260   (when (and gnus-dead-summary
7261              (buffer-name gnus-dead-summary))
7262     (with-current-buffer gnus-dead-summary
7263       (when gnus-dead-summary-mode
7264         (kill-buffer (current-buffer)))))
7265   ;; Make this the current dead summary.
7266   (setq gnus-dead-summary (current-buffer))
7267   (gnus-dead-summary-mode 1)
7268   (let ((name (buffer-name)))
7269     (when (string-match "Summary" name)
7270       (rename-buffer
7271        (concat (substring name 0 (match-beginning 0)) "Dead "
7272                (substring name (match-beginning 0)))
7273        t)
7274       (bury-buffer))))
7275
7276 (defun gnus-kill-or-deaden-summary (buffer)
7277   "Kill or deaden the summary BUFFER."
7278   (save-excursion
7279     (when (and (buffer-name buffer)
7280                (not gnus-single-article-buffer))
7281       (with-current-buffer buffer
7282         (gnus-kill-buffer gnus-article-buffer)
7283         (gnus-kill-buffer gnus-original-article-buffer)))
7284     (cond
7285      ;; Kill the buffer.
7286      (gnus-kill-summary-on-exit
7287       (when (and gnus-use-trees
7288                  (gnus-buffer-exists-p buffer))
7289         (with-current-buffer buffer
7290           (gnus-tree-close gnus-newsgroup-name)))
7291       (gnus-kill-buffer buffer))
7292      ;; Deaden the buffer.
7293      ((gnus-buffer-exists-p buffer)
7294       (with-current-buffer buffer
7295         (gnus-deaden-summary))))))
7296
7297 (defun gnus-summary-wake-up-the-dead (&rest args)
7298   "Wake up the dead summary buffer."
7299   (interactive)
7300   (gnus-dead-summary-mode -1)
7301   (let ((name (buffer-name)))
7302     (when (string-match "Dead " name)
7303       (rename-buffer
7304        (concat (substring name 0 (match-beginning 0))
7305                (substring name (match-end 0)))
7306        t)))
7307   (gnus-message 3 "This dead summary is now alive again"))
7308
7309 ;; Suggested by Andrew Eskilsson <pi92ae@pt.hk-r.se>.
7310 (defun gnus-summary-fetch-faq (&optional faq-dir)
7311   "Fetch the FAQ for the current group.
7312 If FAQ-DIR (the prefix), prompt for a directory to search for the faq
7313 in."
7314   (interactive
7315    (list
7316     (when current-prefix-arg
7317       (completing-read
7318        "FAQ dir: " (and (listp gnus-group-faq-directory)
7319                         (mapcar 'list
7320                                 gnus-group-faq-directory))))))
7321   (let (gnus-faq-buffer)
7322     (when (setq gnus-faq-buffer
7323                 (gnus-group-fetch-faq gnus-newsgroup-name faq-dir))
7324       (gnus-configure-windows 'summary-faq))))
7325
7326 ;; Suggested by Per Abrahamsen <amanda@iesd.auc.dk>.
7327 (defun gnus-summary-describe-group (&optional force)
7328   "Describe the current newsgroup."
7329   (interactive "P")
7330   (gnus-group-describe-group force gnus-newsgroup-name))
7331
7332 (defun gnus-summary-describe-briefly ()
7333   "Describe summary mode commands briefly."
7334   (interactive)
7335   (gnus-message 6 (substitute-command-keys "\\<gnus-summary-mode-map>\\[gnus-summary-next-page]:Select  \\[gnus-summary-next-unread-article]:Forward  \\[gnus-summary-prev-unread-article]:Backward  \\[gnus-summary-exit]:Exit  \\[gnus-info-find-node]:Run Info        \\[gnus-summary-describe-briefly]:This help")))
7336
7337 ;; Walking around group mode buffer from summary mode.
7338
7339 (defun gnus-summary-next-group (&optional no-article target-group backward)
7340   "Exit current newsgroup and then select next unread newsgroup.
7341 If prefix argument NO-ARTICLE is non-nil, no article is selected
7342 initially.  If TARGET-GROUP, go to this group.  If BACKWARD, go to
7343 previous group instead."
7344   (interactive "P")
7345   ;; Stop pre-fetching.
7346   (gnus-async-halt-prefetch)
7347   (let ((current-group gnus-newsgroup-name)
7348         (current-buffer (current-buffer))
7349         entered)
7350     ;; First we semi-exit this group to update Xrefs and all variables.
7351     ;; We can't do a real exit, because the window conf must remain
7352     ;; the same in case the user is prompted for info, and we don't
7353     ;; want the window conf to change before that...
7354     (gnus-summary-exit t)
7355     (while (not entered)
7356       ;; Then we find what group we are supposed to enter.
7357       (set-buffer gnus-group-buffer)
7358       (gnus-group-jump-to-group current-group)
7359       (setq target-group
7360             (or target-group
7361                 (if (eq gnus-keep-same-level 'best)
7362                     (gnus-summary-best-group gnus-newsgroup-name)
7363                   (gnus-summary-search-group backward gnus-keep-same-level))))
7364       (if (not target-group)
7365           ;; There are no further groups, so we return to the group
7366           ;; buffer.
7367           (progn
7368             (gnus-message 5 "Returning to the group buffer")
7369             (setq entered t)
7370             (when (gnus-buffer-live-p current-buffer)
7371               (set-buffer current-buffer)
7372               (gnus-summary-exit))
7373             (gnus-run-hooks 'gnus-group-no-more-groups-hook))
7374         ;; We try to enter the target group.
7375         (gnus-group-jump-to-group target-group)
7376         (let ((unreads (gnus-group-group-unread)))
7377           (if (and (or (eq t unreads)
7378                        (and unreads (not (zerop unreads))))
7379                    (gnus-summary-read-group
7380                     target-group nil no-article
7381                     (and (buffer-name current-buffer) current-buffer)
7382                     nil backward))
7383               (setq entered t)
7384             (setq current-group target-group
7385                   target-group nil)))))))
7386
7387 (defun gnus-summary-prev-group (&optional no-article)
7388   "Exit current newsgroup and then select previous unread newsgroup.
7389 If prefix argument NO-ARTICLE is non-nil, no article is selected initially."
7390   (interactive "P")
7391   (gnus-summary-next-group no-article nil t))
7392
7393 ;; Walking around summary lines.
7394
7395 (defun gnus-summary-first-subject (&optional unread undownloaded unseen)
7396   "Go to the first subject satisfying any non-nil constraint.
7397 If UNREAD is non-nil, the article should be unread.
7398 If UNDOWNLOADED is non-nil, the article should be undownloaded.
7399 If UNSEEN is non-nil, the article should be unseen.
7400 Returns the article selected or nil if there are no matching articles."
7401   (interactive "P")
7402   (cond
7403    ;; Empty summary.
7404    ((null gnus-newsgroup-data)
7405     (gnus-message 3 "No articles in the group")
7406     nil)
7407    ;; Pick the first article.
7408    ((not (or unread undownloaded unseen))
7409     (goto-char (gnus-data-pos (car gnus-newsgroup-data)))
7410     (gnus-data-number (car gnus-newsgroup-data)))
7411    ;; Find the first unread article.
7412    (t
7413     (let ((data gnus-newsgroup-data))
7414       (while (and data
7415                   (let ((num (gnus-data-number (car data))))
7416                     (or (memq num gnus-newsgroup-unfetched)
7417                         (not (or (and unread
7418                                       (memq num gnus-newsgroup-unreads))
7419                                  (and undownloaded
7420                                       (memq num gnus-newsgroup-undownloaded))
7421                                  (and unseen
7422                                       (memq num gnus-newsgroup-unseen)))))))
7423         (setq data (cdr data)))
7424       (prog1
7425           (if data
7426               (progn
7427                 (goto-char (gnus-data-pos (car data)))
7428                 (gnus-data-number (car data)))
7429             (gnus-message 3 "No more%s articles"
7430                           (let* ((r (when unread " unread"))
7431                                  (d (when undownloaded " undownloaded"))
7432                                  (s (when unseen " unseen"))
7433                                  (l (delq nil (list r d s))))
7434                             (cond ((= 3 (length l))
7435                                    (concat r "," d ", or" s))
7436                                   ((= 2 (length l))
7437                                    (concat (car l) ", or" (cadr l)))
7438                                   ((= 1 (length l))
7439                                    (car l))
7440                                   (t
7441                                    ""))))
7442             nil
7443             )
7444         (gnus-summary-position-point))))))
7445
7446 (defun gnus-summary-next-subject (n &optional unread dont-display)
7447   "Go to next N'th summary line.
7448 If N is negative, go to the previous N'th subject line.
7449 If UNREAD is non-nil, only unread articles are selected.
7450 The difference between N and the actual number of steps taken is
7451 returned."
7452   (interactive "p")
7453   (let ((backward (< n 0))
7454         (n (abs n)))
7455     (while (and (> n 0)
7456                 (if backward
7457                     (gnus-summary-find-prev unread)
7458                   (gnus-summary-find-next unread)))
7459       (unless (zerop (setq n (1- n)))
7460         (gnus-summary-show-thread)))
7461     (when (/= 0 n)
7462       (gnus-message 7 "No more%s articles"
7463                     (if unread " unread" "")))
7464     (unless dont-display
7465       (gnus-summary-recenter)
7466       (gnus-summary-position-point))
7467     n))
7468
7469 (defun gnus-summary-next-unread-subject (n)
7470   "Go to next N'th unread summary line."
7471   (interactive "p")
7472   (gnus-summary-next-subject n t))
7473
7474 (defun gnus-summary-prev-subject (n &optional unread)
7475   "Go to previous N'th summary line.
7476 If optional argument UNREAD is non-nil, only unread article is selected."
7477   (interactive "p")
7478   (gnus-summary-next-subject (- n) unread))
7479
7480 (defun gnus-summary-prev-unread-subject (n)
7481   "Go to previous N'th unread summary line."
7482   (interactive "p")
7483   (gnus-summary-next-subject (- n) t))
7484
7485 (defun gnus-summary-goto-subjects (articles)
7486   "Insert the subject header for ARTICLES in the current buffer."
7487   (save-excursion
7488     (dolist (article articles)
7489       (gnus-summary-goto-subject article t)))
7490   (gnus-summary-limit (append articles gnus-newsgroup-limit))
7491   (gnus-summary-position-point))
7492
7493 (defun gnus-summary-goto-subject (article &optional force silent)
7494   "Go to the subject line of ARTICLE.
7495 If FORCE, also allow jumping to articles not currently shown."
7496   (interactive "nArticle number: ")
7497   (unless (numberp article)
7498     (error "Article %s is not a number" article))
7499   (let ((b (point))
7500         (data (gnus-data-find article)))
7501     ;; We read in the article if we have to.
7502     (and (not data)
7503          force
7504          (gnus-summary-insert-subject
7505           article
7506           (if (or (numberp force) (vectorp force)) force)
7507           t)
7508          (setq data (gnus-data-find article)))
7509     (goto-char b)
7510     (if (not data)
7511         (progn
7512           (unless silent
7513             (gnus-message 3 "Can't find article %d" article))
7514           nil)
7515       (let ((pt (gnus-data-pos data)))
7516         (goto-char pt)
7517         (gnus-summary-set-article-display-arrow pt))
7518       (gnus-summary-position-point)
7519       article)))
7520
7521 ;; Walking around summary lines with displaying articles.
7522
7523 (defun gnus-summary-expand-window (&optional arg)
7524   "Make the summary buffer take up the entire Emacs frame.
7525 Given a prefix, will force an `article' buffer configuration."
7526   (interactive "P")
7527   (if arg
7528       (gnus-configure-windows 'article 'force)
7529     (gnus-configure-windows 'summary 'force)))
7530
7531 (defun gnus-summary-display-article (article &optional all-header)
7532   "Display ARTICLE in article buffer."
7533   (unless (and (gnus-buffer-live-p gnus-article-buffer)
7534                (with-current-buffer gnus-article-buffer
7535                  (eq major-mode 'gnus-article-mode)))
7536     (gnus-article-setup-buffer))
7537   (gnus-set-global-variables)
7538   (with-current-buffer gnus-article-buffer
7539     (setq gnus-article-charset gnus-newsgroup-charset)
7540     (setq gnus-article-ignored-charsets gnus-newsgroup-ignored-charsets)
7541     (mm-enable-multibyte))
7542   (if (null article)
7543       nil
7544     (prog1
7545         (if gnus-summary-display-article-function
7546             (funcall gnus-summary-display-article-function article all-header)
7547           (gnus-article-prepare article all-header))
7548       (gnus-run-hooks 'gnus-select-article-hook)
7549       (when (and gnus-current-article
7550                  (not (zerop gnus-current-article)))
7551         (gnus-summary-goto-subject gnus-current-article))
7552       (gnus-summary-recenter)
7553       (when (and gnus-use-trees gnus-show-threads)
7554         (gnus-possibly-generate-tree article)
7555         (gnus-highlight-selected-tree article))
7556       ;; Successfully display article.
7557       (gnus-article-set-window-start
7558        (cdr (assq article gnus-newsgroup-bookmarks))))))
7559
7560 (defun gnus-summary-select-article (&optional all-headers force pseudo article)
7561   "Select the current article.
7562 If ALL-HEADERS is non-nil, show all header fields.  If FORCE is
7563 non-nil, the article will be re-fetched even if it already present in
7564 the article buffer.  If PSEUDO is non-nil, pseudo-articles will also
7565 be displayed."
7566   ;; Make sure we are in the summary buffer to work around bbdb bug.
7567   (unless (eq major-mode 'gnus-summary-mode)
7568     (set-buffer gnus-summary-buffer))
7569   (let ((article (or article (gnus-summary-article-number)))
7570         (all-headers (not (not all-headers))) ;Must be t or nil.
7571         gnus-summary-display-article-function)
7572     (and (not pseudo)
7573          (gnus-summary-article-pseudo-p article)
7574          (error "This is a pseudo-article"))
7575     (with-current-buffer gnus-summary-buffer
7576       (if (or (and gnus-single-article-buffer
7577                    (or (null gnus-current-article)
7578                        (null gnus-article-current)
7579                        (null (get-buffer gnus-article-buffer))
7580                        (not (eq article (cdr gnus-article-current)))
7581                        (not (equal (car gnus-article-current)
7582                                    gnus-newsgroup-name))))
7583               (and (not gnus-single-article-buffer)
7584                    (or (null gnus-current-article)
7585                        (not (eq gnus-current-article article))))
7586               force)
7587           ;; The requested article is different from the current article.
7588           (progn
7589             (gnus-summary-display-article article all-headers)
7590             (when (gnus-buffer-live-p gnus-article-buffer)
7591               (with-current-buffer gnus-article-buffer
7592                 (if (not gnus-article-decoded-p) ;; a local variable
7593                     (mm-disable-multibyte))))
7594             (gnus-article-set-window-start
7595              (cdr (assq article gnus-newsgroup-bookmarks)))
7596             article)
7597         'old))))
7598
7599 (defun gnus-summary-force-verify-and-decrypt ()
7600   "Display buttons for signed/encrypted parts and verify/decrypt them."
7601   (interactive)
7602   (let ((mm-verify-option 'known)
7603         (mm-decrypt-option 'known)
7604         (gnus-article-emulate-mime t)
7605         (gnus-buttonized-mime-types (append (list "multipart/signed"
7606                                                   "multipart/encrypted")
7607                                             gnus-buttonized-mime-types)))
7608     (gnus-summary-select-article nil 'force)))
7609
7610 (defun gnus-summary-set-current-mark (&optional current-mark)
7611   "Obsolete function."
7612   nil)
7613
7614 (defun gnus-summary-next-article (&optional unread subject backward push)
7615   "Select the next article.
7616 If UNREAD, only unread articles are selected.
7617 If SUBJECT, only articles with SUBJECT are selected.
7618 If BACKWARD, the previous article is selected instead of the next."
7619   (interactive "P")
7620   ;; Make sure we are in the summary buffer.
7621   (unless (eq major-mode 'gnus-summary-mode)
7622     (set-buffer gnus-summary-buffer))
7623   (cond
7624    ;; Is there such an article?
7625    ((and (gnus-summary-search-forward unread subject backward)
7626          (or (gnus-summary-display-article (gnus-summary-article-number))
7627              (eq (gnus-summary-article-mark) gnus-canceled-mark)))
7628     (gnus-summary-position-point))
7629    ;; If not, we try the first unread, if that is wanted.
7630    ((and subject
7631          gnus-auto-select-same
7632          (gnus-summary-first-unread-article))
7633     (gnus-summary-position-point)
7634     (gnus-message 6 "Wrapped"))
7635    ;; Try to get next/previous article not displayed in this group.
7636    ((and gnus-auto-extend-newsgroup
7637          (not unread) (not subject))
7638     (gnus-summary-goto-article
7639      (if backward (1- gnus-newsgroup-begin) (1+ gnus-newsgroup-end))
7640      nil (count-lines (point-min) (point))))
7641    ;; Go to next/previous group.
7642    (t
7643     (unless (gnus-ephemeral-group-p gnus-newsgroup-name)
7644       (gnus-summary-jump-to-group gnus-newsgroup-name))
7645     (let ((cmd (if (featurep 'xemacs)
7646                    last-command-char
7647                  last-command-event))
7648           (point
7649            (with-current-buffer gnus-group-buffer
7650              (point)))
7651           (group
7652            (if (eq gnus-keep-same-level 'best)
7653                (gnus-summary-best-group gnus-newsgroup-name)
7654              (gnus-summary-search-group backward gnus-keep-same-level))))
7655       ;; For some reason, the group window gets selected.  We change
7656       ;; it back.
7657       (select-window (get-buffer-window (current-buffer)))
7658       ;; Select next unread newsgroup automagically.
7659       (cond
7660        ((or (not gnus-auto-select-next)
7661             (not cmd))
7662         (gnus-message 7 "No more%s articles" (if unread " unread" "")))
7663        ((or (eq gnus-auto-select-next 'quietly)
7664             (and (eq gnus-auto-select-next 'slightly-quietly)
7665                  push)
7666             (and (eq gnus-auto-select-next 'almost-quietly)
7667                  (gnus-summary-last-article-p)))
7668         ;; Select quietly.
7669         (if (gnus-ephemeral-group-p gnus-newsgroup-name)
7670             (gnus-summary-exit)
7671           (gnus-message 7 "No more%s articles (%s)..."
7672                         (if unread " unread" "")
7673                         (if group (concat "selecting " group)
7674                           "exiting"))
7675           (gnus-summary-next-group nil group backward)))
7676        (t
7677         (when (gnus-key-press-event-p last-input-event)
7678           (gnus-summary-walk-group-buffer
7679            gnus-newsgroup-name cmd unread backward point))))))))
7680
7681 (defun gnus-summary-walk-group-buffer (from-group cmd unread backward start)
7682   (let ((keystrokes '((?\C-n (gnus-group-next-unread-group 1))
7683                       (?\C-p (gnus-group-prev-unread-group 1))))
7684         (cursor-in-echo-area t)
7685         keve key group ended prompt)
7686     (with-current-buffer gnus-group-buffer
7687       (goto-char start)
7688       (setq group
7689             (if (eq gnus-keep-same-level 'best)
7690                 (gnus-summary-best-group gnus-newsgroup-name)
7691               (gnus-summary-search-group backward gnus-keep-same-level))))
7692     (while (not ended)
7693       (setq prompt
7694             (format
7695              "No more%s articles%s " (if unread " unread" "")
7696              (if (and group
7697                       (not (gnus-ephemeral-group-p gnus-newsgroup-name)))
7698                  (format " (Type %s for %s [%s])"
7699                          (single-key-description cmd)
7700                          (gnus-group-decoded-name group)
7701                          (gnus-group-unread group))
7702                (format " (Type %s to exit %s)"
7703                        (single-key-description cmd)
7704                        (gnus-group-decoded-name gnus-newsgroup-name)))))
7705       ;; Confirm auto selection.
7706       (setq key (car (setq keve (gnus-read-event-char prompt)))
7707             ended t)
7708       (cond
7709        ((assq key keystrokes)
7710         (let ((obuf (current-buffer)))
7711           (switch-to-buffer gnus-group-buffer)
7712           (when group
7713             (gnus-group-jump-to-group group))
7714           (eval (cadr (assq key keystrokes)))
7715           (setq group (gnus-group-group-name))
7716           (switch-to-buffer obuf))
7717         (setq ended nil))
7718        ((equal key cmd)
7719         (if (or (not group)
7720                 (gnus-ephemeral-group-p gnus-newsgroup-name))
7721             (gnus-summary-exit)
7722           (gnus-summary-next-group nil group backward)))
7723        (t
7724         (push (cdr keve) unread-command-events))))))
7725
7726 (defun gnus-summary-next-unread-article ()
7727   "Select unread article after current one."
7728   (interactive)
7729   (gnus-summary-next-article
7730    (or (not (eq gnus-summary-goto-unread 'never))
7731        (gnus-summary-last-article-p (gnus-summary-article-number)))
7732    (and gnus-auto-select-same
7733         (gnus-summary-article-subject))))
7734
7735 (defun gnus-summary-prev-article (&optional unread subject)
7736   "Select the article before the current one.
7737 If UNREAD is non-nil, only unread articles are selected."
7738   (interactive "P")
7739   (gnus-summary-next-article unread subject t))
7740
7741 (defun gnus-summary-prev-unread-article ()
7742   "Select unread article before current one."
7743   (interactive)
7744   (gnus-summary-prev-article
7745    (or (not (eq gnus-summary-goto-unread 'never))
7746        (gnus-summary-first-article-p (gnus-summary-article-number)))
7747    (and gnus-auto-select-same
7748         (gnus-summary-article-subject))))
7749
7750 (defun gnus-summary-next-page (&optional lines circular stop)
7751   "Show next page of the selected article.
7752 If at the end of the current article, select the next article.
7753 LINES says how many lines should be scrolled up.
7754
7755 If CIRCULAR is non-nil, go to the start of the article instead of
7756 selecting the next article when reaching the end of the current
7757 article.
7758
7759 If STOP is non-nil, just stop when reaching the end of the message.
7760
7761 Also see the variable `gnus-article-skip-boring'."
7762   (interactive "P")
7763   (setq gnus-summary-buffer (current-buffer))
7764   (gnus-set-global-variables)
7765   (let ((article (gnus-summary-article-number))
7766         (article-window (get-buffer-window gnus-article-buffer t))
7767         endp)
7768     ;; If the buffer is empty, we have no article.
7769     (unless article
7770       (error "No article to select"))
7771     (gnus-configure-windows 'article)
7772     (if (eq (cdr (assq article gnus-newsgroup-reads)) gnus-canceled-mark)
7773         (if (and (eq gnus-summary-goto-unread 'never)
7774                  (not (gnus-summary-last-article-p article)))
7775             (gnus-summary-next-article)
7776           (gnus-summary-next-unread-article))
7777       (if (or (null gnus-current-article)
7778               (null gnus-article-current)
7779               (/= article (cdr gnus-article-current))
7780               (not (equal (car gnus-article-current) gnus-newsgroup-name)))
7781           ;; Selected subject is different from current article's.
7782           (gnus-summary-display-article article)
7783         (when article-window
7784           (gnus-eval-in-buffer-window gnus-article-buffer
7785             (setq endp (or (gnus-article-next-page lines)
7786                            (gnus-article-only-boring-p))))
7787           (when endp
7788             (cond ((or stop gnus-summary-stop-at-end-of-message)
7789                    (gnus-message 3 "End of message"))
7790                   (circular
7791                    (gnus-summary-beginning-of-article))
7792                   (lines
7793                    (gnus-message 3 "End of message"))
7794                   ((null lines)
7795                    (if (and (eq gnus-summary-goto-unread 'never)
7796                             (not (gnus-summary-last-article-p article)))
7797                        (gnus-summary-next-article)
7798                      (gnus-summary-next-unread-article))))))))
7799     (gnus-summary-recenter)
7800     (gnus-summary-position-point)))
7801
7802 (defun gnus-summary-prev-page (&optional lines move)
7803   "Show previous page of selected article.
7804 Argument LINES specifies lines to be scrolled down.
7805 If MOVE, move to the previous unread article if point is at
7806 the beginning of the buffer."
7807   (interactive "P")
7808   (let ((article (gnus-summary-article-number))
7809         (article-window (get-buffer-window gnus-article-buffer t))
7810         endp)
7811     (gnus-configure-windows 'article)
7812     (if (or (null gnus-current-article)
7813             (null gnus-article-current)
7814             (/= article (cdr gnus-article-current))
7815             (not (equal (car gnus-article-current) gnus-newsgroup-name)))
7816         ;; Selected subject is different from current article's.
7817         (gnus-summary-display-article article)
7818       (gnus-summary-recenter)
7819       (when article-window
7820         (gnus-eval-in-buffer-window gnus-article-buffer
7821           (setq endp (gnus-article-prev-page lines)))
7822         (when (and move endp)
7823           (cond (lines
7824                  (gnus-message 3 "Beginning of message"))
7825                 ((null lines)
7826                  (if (and (eq gnus-summary-goto-unread 'never)
7827                           (not (gnus-summary-first-article-p article)))
7828                      (gnus-summary-prev-article)
7829                    (gnus-summary-prev-unread-article))))))))
7830   (gnus-summary-position-point))
7831
7832 (defun gnus-summary-prev-page-or-article (&optional lines)
7833   "Show previous page of selected article.
7834 Argument LINES specifies lines to be scrolled down.
7835 If at the beginning of the article, go to the next article."
7836   (interactive "P")
7837   (gnus-summary-prev-page lines t))
7838
7839 (defun gnus-summary-scroll-up (lines)
7840   "Scroll up (or down) one line current article.
7841 Argument LINES specifies lines to be scrolled up (or down if negative)."
7842   (interactive "p")
7843   (gnus-configure-windows 'article)
7844   (gnus-summary-show-thread)
7845   (when (eq (gnus-summary-select-article nil nil 'pseudo) 'old)
7846     (gnus-eval-in-buffer-window gnus-article-buffer
7847       (cond ((> lines 0)
7848              (when (gnus-article-next-page lines)
7849                (gnus-message 3 "End of message")))
7850             ((< lines 0)
7851              (gnus-article-prev-page (- lines))))))
7852   (gnus-summary-recenter)
7853   (gnus-summary-position-point))
7854
7855 (defun gnus-summary-scroll-down (lines)
7856   "Scroll down (or up) one line current article.
7857 Argument LINES specifies lines to be scrolled down (or up if negative)."
7858   (interactive "p")
7859   (gnus-summary-scroll-up (- lines)))
7860
7861 (defun gnus-summary-next-same-subject ()
7862   "Select next article which has the same subject as current one."
7863   (interactive)
7864   (gnus-summary-next-article nil (gnus-summary-article-subject)))
7865
7866 (defun gnus-summary-prev-same-subject ()
7867   "Select previous article which has the same subject as current one."
7868   (interactive)
7869   (gnus-summary-prev-article nil (gnus-summary-article-subject)))
7870
7871 (defun gnus-summary-next-unread-same-subject ()
7872   "Select next unread article which has the same subject as current one."
7873   (interactive)
7874   (gnus-summary-next-article t (gnus-summary-article-subject)))
7875
7876 (defun gnus-summary-prev-unread-same-subject ()
7877   "Select previous unread article which has the same subject as current one."
7878   (interactive)
7879   (gnus-summary-prev-article t (gnus-summary-article-subject)))
7880
7881 (defun gnus-summary-first-unread-article ()
7882   "Select the first unread article.
7883 Return nil if there are no unread articles."
7884   (interactive)
7885   (prog1
7886       (when (gnus-summary-first-subject t)
7887         (gnus-summary-show-thread)
7888         (gnus-summary-first-subject t)
7889         (gnus-summary-display-article (gnus-summary-article-number)))
7890     (gnus-summary-position-point)))
7891
7892 (defun gnus-summary-first-unread-subject ()
7893   "Place the point on the subject line of the first unread article.
7894 Return nil if there are no unread articles."
7895   (interactive)
7896   (prog1
7897       (when (gnus-summary-first-subject t)
7898         (gnus-summary-show-thread)
7899         (gnus-summary-first-subject t))
7900     (gnus-summary-position-point)))
7901
7902 (defun gnus-summary-first-unseen-subject ()
7903   "Place the point on the subject line of the first unseen article.
7904 Return nil if there are no unseen articles."
7905   (interactive)
7906   (prog1
7907       (when (gnus-summary-first-subject nil nil t)
7908         (gnus-summary-show-thread)
7909         (gnus-summary-first-subject nil nil t))
7910     (gnus-summary-position-point)))
7911
7912 (defun gnus-summary-first-unseen-or-unread-subject ()
7913   "Place the point on the subject line of the first unseen article or,
7914 if all article have been seen, on the subject line of the first unread
7915 article."
7916   (interactive)
7917   (prog1
7918       (unless (when (gnus-summary-first-subject nil nil t)
7919                 (gnus-summary-show-thread)
7920                 (gnus-summary-first-subject nil nil t))
7921         (when (gnus-summary-first-subject t)
7922           (gnus-summary-show-thread)
7923           (gnus-summary-first-subject t)))
7924     (gnus-summary-position-point)))
7925
7926 (defun gnus-summary-first-article ()
7927   "Select the first article.
7928 Return nil if there are no articles."
7929   (interactive)
7930   (prog1
7931       (when (gnus-summary-first-subject)
7932         (gnus-summary-show-thread)
7933         (gnus-summary-first-subject)
7934         (gnus-summary-display-article (gnus-summary-article-number)))
7935     (gnus-summary-position-point)))
7936
7937 (defun gnus-summary-best-unread-article (&optional arg)
7938   "Select the unread article with the highest score.
7939 If given a prefix argument, select the next unread article that has a
7940 score higher than the default score."
7941   (interactive "P")
7942   (let ((article (if arg
7943                      (gnus-summary-better-unread-subject)
7944                    (gnus-summary-best-unread-subject))))
7945     (if article
7946         (gnus-summary-goto-article article)
7947       (error "No unread articles"))))
7948
7949 (defun gnus-summary-best-unread-subject ()
7950   "Select the unread subject with the highest score."
7951   (interactive)
7952   (let ((best -1000000)
7953         (data gnus-newsgroup-data)
7954         article score)
7955     (while data
7956       (and (gnus-data-unread-p (car data))
7957            (> (setq score
7958                     (gnus-summary-article-score (gnus-data-number (car data))))
7959               best)
7960            (setq best score
7961                  article (gnus-data-number (car data))))
7962       (setq data (cdr data)))
7963     (when article
7964       (gnus-summary-goto-subject article))
7965     (gnus-summary-position-point)
7966     article))
7967
7968 (defun gnus-summary-better-unread-subject ()
7969   "Select the first unread subject that has a score over the default score."
7970   (interactive)
7971   (let ((data gnus-newsgroup-data)
7972         article score)
7973     (while (and (setq article (gnus-data-number (car data)))
7974                 (or (gnus-data-read-p (car data))
7975                     (not (> (gnus-summary-article-score article)
7976                             gnus-summary-default-score))))
7977       (setq data (cdr data)))
7978     (when article
7979       (gnus-summary-goto-subject article))
7980     (gnus-summary-position-point)
7981     article))
7982
7983 (defun gnus-summary-last-subject ()
7984   "Go to the last displayed subject line in the group."
7985   (let ((article (gnus-data-number (car (gnus-data-list t)))))
7986     (when article
7987       (gnus-summary-goto-subject article))))
7988
7989 (defun gnus-summary-goto-article (article &optional all-headers force)
7990   "Fetch ARTICLE (article number or Message-ID) and display it if it exists.
7991 If ALL-HEADERS is non-nil, no header lines are hidden.
7992 If FORCE, go to the article even if it isn't displayed.  If FORCE
7993 is a number, it is the line the article is to be displayed on."
7994   (interactive
7995    (list
7996     (completing-read
7997      "Article number or Message-ID: "
7998      (mapcar (lambda (number) (list (int-to-string number)))
7999              gnus-newsgroup-limit))
8000     current-prefix-arg
8001     t))
8002   (prog1
8003       (if (and (stringp article)
8004                (string-match "@\\|%40" article))
8005           (gnus-summary-refer-article article)
8006         (when (stringp article)
8007           (setq article (string-to-number article)))
8008         (if (gnus-summary-goto-subject article force)
8009             (gnus-summary-display-article article all-headers)
8010           (gnus-message 4 "Couldn't go to article %s" article) nil))
8011     (gnus-summary-position-point)))
8012
8013 (defun gnus-summary-goto-last-article ()
8014   "Go to the previously read article."
8015   (interactive)
8016   (prog1
8017       (when gnus-last-article
8018         (gnus-summary-goto-article gnus-last-article nil t))
8019     (gnus-summary-position-point)))
8020
8021 (defun gnus-summary-pop-article (number)
8022   "Pop one article off the history and go to the previous.
8023 NUMBER articles will be popped off."
8024   (interactive "p")
8025   (let (to)
8026     (setq gnus-newsgroup-history
8027           (cdr (setq to (nthcdr number gnus-newsgroup-history))))
8028     (if to
8029         (gnus-summary-goto-article (car to) nil t)
8030       (error "Article history empty")))
8031   (gnus-summary-position-point))
8032
8033 ;; Summary commands and functions for limiting the summary buffer.
8034
8035 (defun gnus-summary-limit-to-articles (n)
8036   "Limit the summary buffer to the next N articles.
8037 If not given a prefix, use the process marked articles instead."
8038   (interactive "P")
8039   (prog1
8040       (let ((articles (gnus-summary-work-articles n)))
8041         (setq gnus-newsgroup-processable nil)
8042         (gnus-summary-limit articles))
8043     (gnus-summary-position-point)))
8044
8045 (defun gnus-summary-pop-limit (&optional total)
8046   "Restore the previous limit.
8047 If given a prefix, remove all limits."
8048   (interactive "P")
8049   (when total
8050     (setq gnus-newsgroup-limits
8051           (list (mapcar (lambda (h) (mail-header-number h))
8052                         gnus-newsgroup-headers))))
8053   (unless gnus-newsgroup-limits
8054     (error "No limit to pop"))
8055   (prog1
8056       (gnus-summary-limit nil 'pop)
8057     (gnus-summary-position-point)))
8058
8059 (defun gnus-summary-limit-to-subject (subject &optional header not-matching)
8060   "Limit the summary buffer to articles that have subjects that match a regexp.
8061 If NOT-MATCHING, excluding articles that have subjects that match a regexp."
8062   (interactive
8063    (list (read-string (if current-prefix-arg
8064                           "Exclude subject (regexp): "
8065                         "Limit to subject (regexp): "))
8066          nil current-prefix-arg))
8067   (unless header
8068     (setq header "subject"))
8069   (when (not (equal "" subject))
8070     (prog1
8071         (let ((articles (gnus-summary-find-matching
8072                          (or header "subject") subject 'all nil nil
8073                          not-matching)))
8074           (unless articles
8075             (error "Found no matches for \"%s\"" subject))
8076           (gnus-summary-limit articles))
8077       (gnus-summary-position-point))))
8078
8079 (defun gnus-summary-limit-to-author (from &optional not-matching)
8080   "Limit the summary buffer to articles that have authors that match a regexp.
8081 If NOT-MATCHING, excluding articles that have authors that match a regexp."
8082   (interactive
8083    (list (read-string (if current-prefix-arg
8084                           "Exclude author (regexp): "
8085                         "Limit to author (regexp): "))
8086          current-prefix-arg))
8087   (gnus-summary-limit-to-subject from "from" not-matching))
8088
8089 (defun gnus-summary-limit-to-recipient (recipient &optional not-matching)
8090   "Limit the summary buffer to articles with the given RECIPIENT.
8091
8092 If NOT-MATCHING, exclude RECIPIENT.
8093
8094 To and Cc headers are checked.  You need to include them in
8095 `nnmail-extra-headers'."
8096   ;; Unlike `rmail-summary-by-recipients', doesn't include From.
8097   (interactive
8098    (list (read-string (format "%s recipient (regexp): "
8099                               (if current-prefix-arg "Exclude" "Limit to")))
8100          current-prefix-arg))
8101   (when (not (equal "" recipient))
8102     (prog1 (let* ((to
8103                    (if (memq 'To nnmail-extra-headers)
8104                        (gnus-summary-find-matching
8105                         (cons 'extra 'To) recipient 'all nil nil
8106                         not-matching)
8107                      (gnus-message
8108                       1 "`To' isn't present in `nnmail-extra-headers'")
8109                      (sit-for 1)
8110                      nil))
8111                   (cc
8112                    (if (memq 'Cc nnmail-extra-headers)
8113                        (gnus-summary-find-matching
8114                         (cons 'extra 'Cc) recipient 'all nil nil
8115                         not-matching)
8116                      (gnus-message
8117                       1 "`Cc' isn't present in `nnmail-extra-headers'")
8118                      (sit-for 1)
8119                      nil))
8120                   (articles
8121                    (if not-matching
8122                        ;; We need the numbers that are in both lists:
8123                        (mapcar (lambda (a)
8124                                  (and (memq a to) a))
8125                                cc)
8126                      (nconc to cc))))
8127              (unless articles
8128                (error "Found no matches for \"%s\"" recipient))
8129              (gnus-summary-limit articles))
8130       (gnus-summary-position-point))))
8131
8132 (defun gnus-summary-limit-to-address (address &optional not-matching)
8133   "Limit the summary buffer to articles with the given ADDRESS.
8134
8135 If NOT-MATCHING, exclude ADDRESS.
8136
8137 To, Cc and From headers are checked.  You need to include `To' and `Cc'
8138 in `nnmail-extra-headers'."
8139   (interactive
8140    (list (read-string (format "%s address (regexp): "
8141                               (if current-prefix-arg "Exclude" "Limit to")))
8142          current-prefix-arg))
8143   (when (not (equal "" address))
8144     (prog1 (let* ((to
8145                    (if (memq 'To nnmail-extra-headers)
8146                        (gnus-summary-find-matching
8147                         (cons 'extra 'To) address 'all nil nil
8148                         not-matching)
8149                      (gnus-message
8150                       1 "`To' isn't present in `nnmail-extra-headers'")
8151                      (sit-for 1)
8152                      t))
8153                   (cc
8154                    (if (memq 'Cc nnmail-extra-headers)
8155                        (gnus-summary-find-matching
8156                         (cons 'extra 'Cc) address 'all nil nil
8157                         not-matching)
8158                      (gnus-message
8159                       1 "`Cc' isn't present in `nnmail-extra-headers'")
8160                      (sit-for 1)
8161                      t))
8162                   (from
8163                    (gnus-summary-find-matching "from" address
8164                                                'all nil nil not-matching))
8165                   (articles
8166                    (if not-matching
8167                        ;; We need the numbers that are in all lists:
8168                        (if (eq cc t)
8169                            (if (eq to t)
8170                                from
8171                              (mapcar (lambda (a) (car (memq a from))) to))
8172                          (if (eq to t)
8173                              (mapcar (lambda (a) (car (memq a from))) cc)
8174                            (mapcar (lambda (a) (car (memq a from)))
8175                                    (mapcar (lambda (a) (car (memq a to)))
8176                                            cc))))
8177                      (nconc (if (eq to t) nil to)
8178                             (if (eq cc t) nil cc)
8179                             from))))
8180              (unless articles
8181                (error "Found no matches for \"%s\"" address))
8182              (gnus-summary-limit articles))
8183       (gnus-summary-position-point))))
8184
8185 (defun gnus-summary-limit-strange-charsets-predicate (header)
8186   (when (fboundp 'char-charset)
8187     (let ((string (concat (mail-header-subject header)
8188                           (mail-header-from header)))
8189           charset found)
8190       (dotimes (i (1- (length string)))
8191         (setq charset (format "%s" (char-charset (aref string (1+ i)))))
8192         (when (string-match "unicode\\|big\\|japanese" charset)
8193           (setq found t)))
8194       found)))
8195
8196 (defun gnus-summary-limit-to-predicate (predicate)
8197   "Limit to articles where PREDICATE returns non-nil.
8198 PREDICATE will be called with the header structures of the
8199 articles."
8200   (let ((articles nil)
8201         (case-fold-search t))
8202     (dolist (header gnus-newsgroup-headers)
8203       (when (funcall predicate header)
8204         (push (mail-header-number header) articles)))
8205     (gnus-summary-limit (nreverse articles))))
8206
8207 (defun gnus-summary-limit-to-age (age &optional younger-p)
8208   "Limit the summary buffer to articles that are older than (or equal) AGE days.
8209 If YOUNGER-P (the prefix) is non-nil, limit the summary buffer to
8210 articles that are younger than AGE days."
8211   (interactive
8212    (let ((younger current-prefix-arg)
8213          (days-got nil)
8214          days)
8215      (while (not days-got)
8216        (setq days (if younger
8217                       (read-string "Limit to articles younger than (in days, older when negative): ")
8218                     (read-string
8219                      "Limit to articles older than (in days, younger when negative): ")))
8220        (when (> (length days) 0)
8221          (setq days (read days)))
8222        (if (numberp days)
8223            (progn
8224              (setq days-got t)
8225              (when (< days 0)
8226                (setq younger (not younger))
8227                (setq days (* days -1))))
8228          (message "Please enter a number.")
8229          (sleep-for 1)))
8230      (list days younger)))
8231   (prog1
8232       (let ((data gnus-newsgroup-data)
8233             (cutoff (days-to-time age))
8234             articles d date is-younger)
8235         (while (setq d (pop data))
8236           (when (and (vectorp (gnus-data-header d))
8237                      (setq date (mail-header-date (gnus-data-header d))))
8238             (setq is-younger (time-less-p
8239                               (time-since (gnus-date-get-time date))
8240                               cutoff))
8241             (when (if younger-p
8242                       is-younger
8243                     (not is-younger))
8244               (push (gnus-data-number d) articles))))
8245         (gnus-summary-limit (nreverse articles)))
8246     (gnus-summary-position-point)))
8247
8248 (defun gnus-summary-limit-to-extra (header regexp &optional not-matching)
8249   "Limit the summary buffer to articles that match an 'extra' header."
8250   (interactive
8251    (let ((header
8252           (intern
8253            (gnus-completing-read-with-default
8254             (symbol-name (car gnus-extra-headers))
8255             (if current-prefix-arg
8256                 "Exclude extra header"
8257               "Limit extra header")
8258             (mapcar (lambda (x)
8259                       (cons (symbol-name x) x))
8260                     gnus-extra-headers)
8261             nil
8262             t))))
8263      (list header
8264            (read-string (format "%s header %s (regexp): "
8265                                 (if current-prefix-arg "Exclude" "Limit to")
8266                                 header))
8267            current-prefix-arg)))
8268   (when (not (equal "" regexp))
8269     (prog1
8270         (let ((articles (gnus-summary-find-matching
8271                          (cons 'extra header) regexp 'all nil nil
8272                          not-matching)))
8273           (unless articles
8274             (error "Found no matches for \"%s\"" regexp))
8275           (gnus-summary-limit articles))
8276       (gnus-summary-position-point))))
8277
8278 (defun gnus-summary-limit-to-display-predicate ()
8279   "Limit the summary buffer to the predicated in the `display' group parameter."
8280   (interactive)
8281   (unless gnus-newsgroup-display
8282     (error "There is no `display' group parameter"))
8283   (let (articles)
8284     (dolist (number gnus-newsgroup-articles)
8285       (when (funcall gnus-newsgroup-display)
8286         (push number articles)))
8287     (gnus-summary-limit articles))
8288   (gnus-summary-position-point))
8289
8290 (defalias 'gnus-summary-delete-marked-as-read 'gnus-summary-limit-to-unread)
8291 (make-obsolete
8292  'gnus-summary-delete-marked-as-read 'gnus-summary-limit-to-unread "Emacs 20.4")
8293
8294 (defun gnus-summary-limit-to-unread (&optional all)
8295   "Limit the summary buffer to articles that are not marked as read.
8296 If ALL is non-nil, limit strictly to unread articles."
8297   (interactive "P")
8298   (if all
8299       (gnus-summary-limit-to-marks (char-to-string gnus-unread-mark))
8300     (gnus-summary-limit-to-marks
8301      ;; Concat all the marks that say that an article is read and have
8302      ;; those removed.
8303      (list gnus-del-mark gnus-read-mark gnus-ancient-mark
8304            gnus-killed-mark gnus-spam-mark gnus-kill-file-mark
8305            gnus-low-score-mark gnus-expirable-mark
8306            gnus-canceled-mark gnus-catchup-mark gnus-sparse-mark
8307            gnus-duplicate-mark gnus-souped-mark)
8308      'reverse)))
8309
8310 (defun gnus-summary-limit-to-headers (match &optional reverse)
8311   "Limit the summary buffer to articles that have headers that match MATCH.
8312 If REVERSE (the prefix), limit to articles that don't match."
8313   (interactive "sMatch headers (regexp): \nP")
8314   (gnus-summary-limit-to-bodies match reverse t))
8315
8316 (defun gnus-summary-limit-to-bodies (match &optional reverse headersp)
8317   "Limit the summary buffer to articles that have bodies that match MATCH.
8318 If REVERSE (the prefix), limit to articles that don't match."
8319   (interactive "sMatch body (regexp): \nP")
8320   (let ((articles nil)
8321         (gnus-select-article-hook nil)  ;Disable hook.
8322         (gnus-article-prepare-hook nil)
8323         (gnus-use-article-prefetch nil)
8324         (gnus-keep-backlog nil)
8325         (gnus-break-pages nil)
8326         (gnus-summary-display-arrow nil)
8327         (gnus-updated-mode-lines nil)
8328         (gnus-auto-center-summary nil)
8329         (gnus-display-mime-function nil))
8330     (dolist (data gnus-newsgroup-data)
8331       (let (gnus-mark-article-hook)
8332         (gnus-summary-select-article t t nil (gnus-data-number data)))
8333       (with-current-buffer gnus-article-buffer
8334         (article-goto-body)
8335         (let* ((case-fold-search t)
8336                (found (if headersp
8337                           (re-search-backward match nil t)
8338                         (re-search-forward match nil t))))
8339           (when (or (and found
8340                          (not reverse))
8341                     (and (not found)
8342                          reverse))
8343             (push (gnus-data-number data) articles)))))
8344     (if (not articles)
8345         (message "No messages matched")
8346       (gnus-summary-limit articles)))
8347   (gnus-summary-position-point))
8348
8349 (defun gnus-summary-limit-to-singletons (&optional threadsp)
8350   "Limit the summary buffer to articles that aren't part on any thread.
8351 If THREADSP (the prefix), limit to articles that are in threads."
8352   (interactive "P")
8353   (let ((articles nil)
8354         thread-articles
8355         threads)
8356     (dolist (thread gnus-newsgroup-threads)
8357       (if (stringp (car thread))
8358           (dolist (thread (cdr thread))
8359             (push thread threads))
8360         (push thread threads)))
8361     (dolist (thread threads)
8362       (setq thread-articles (gnus-articles-in-thread thread))
8363       (when (or (and threadsp
8364                      (> (length thread-articles) 1))
8365                 (and (not threadsp)
8366                      (= (length thread-articles) 1)))
8367         (setq articles (nconc thread-articles articles))))
8368     (if (not articles)
8369         (message "No messages matched")
8370       (gnus-summary-limit articles))
8371     (gnus-summary-position-point)))
8372
8373 (defun gnus-summary-limit-to-replied (&optional unreplied)
8374   "Limit the summary buffer to replied articles.
8375 If UNREPLIED (the prefix), limit to unreplied articles."
8376   (interactive "P")
8377   (if unreplied
8378       (gnus-summary-limit
8379        (gnus-set-difference gnus-newsgroup-articles
8380         gnus-newsgroup-replied))
8381     (gnus-summary-limit gnus-newsgroup-replied))
8382   (gnus-summary-position-point))
8383
8384 (defalias 'gnus-summary-delete-marked-with 'gnus-summary-limit-exclude-marks)
8385 (make-obsolete 'gnus-summary-delete-marked-with
8386                'gnus-summary-limit-exclude-marks "Emacs 20.4")
8387
8388 (defun gnus-summary-limit-exclude-marks (marks &optional reverse)
8389   "Exclude articles that are marked with MARKS (e.g. \"DK\").
8390 If REVERSE, limit the summary buffer to articles that are marked
8391 with MARKS.  MARKS can either be a string of marks or a list of marks.
8392 Returns how many articles were removed."
8393   (interactive "sMarks: ")
8394   (gnus-summary-limit-to-marks marks t))
8395
8396 (defun gnus-summary-limit-to-marks (marks &optional reverse)
8397   "Limit the summary buffer to articles that are marked with MARKS (e.g. \"DK\").
8398 If REVERSE (the prefix), limit the summary buffer to articles that are
8399 not marked with MARKS.  MARKS can either be a string of marks or a
8400 list of marks.
8401 Returns how many articles were removed."
8402   (interactive "sMarks: \nP")
8403   (prog1
8404       (let ((data gnus-newsgroup-data)
8405             (marks (if (listp marks) marks
8406                      (append marks nil))) ; Transform to list.
8407             articles)
8408         (while data
8409           (when (if reverse (not (memq (gnus-data-mark (car data)) marks))
8410                   (memq (gnus-data-mark (car data)) marks))
8411             (push (gnus-data-number (car data)) articles))
8412           (setq data (cdr data)))
8413         (gnus-summary-limit articles))
8414     (gnus-summary-position-point)))
8415
8416 (defun gnus-summary-limit-to-score (score)
8417   "Limit to articles with score at or above SCORE."
8418   (interactive "NLimit to articles with score of at least: ")
8419   (let ((data gnus-newsgroup-data)
8420         articles)
8421     (while data
8422       (when (>= (gnus-summary-article-score (gnus-data-number (car data)))
8423                 score)
8424         (push (gnus-data-number (car data)) articles))
8425       (setq data (cdr data)))
8426     (prog1
8427         (gnus-summary-limit articles)
8428       (gnus-summary-position-point))))
8429
8430 (defun gnus-summary-limit-to-unseen ()
8431   "Limit to unseen articles."
8432   (interactive)
8433   (prog1
8434       (gnus-summary-limit gnus-newsgroup-unseen)
8435     (gnus-summary-position-point)))
8436
8437 (defun gnus-summary-limit-include-thread (id)
8438   "Display all the hidden articles that is in the thread with ID in it.
8439 When called interactively, ID is the Message-ID of the current
8440 article."
8441   (interactive (list (mail-header-id (gnus-summary-article-header))))
8442   (let ((articles (gnus-articles-in-thread
8443                    (gnus-id-to-thread (gnus-root-id id)))))
8444     (prog1
8445         (gnus-summary-limit (nconc articles gnus-newsgroup-limit))
8446       (gnus-summary-limit-include-matching-articles
8447        "subject"
8448        (regexp-quote (gnus-simplify-subject-re
8449                       (mail-header-subject (gnus-id-to-header id)))))
8450       (gnus-summary-position-point))))
8451
8452 (defun gnus-summary-limit-include-matching-articles (header regexp)
8453   "Display all the hidden articles that have HEADERs that match REGEXP."
8454   (interactive (list (read-string "Match on header: ")
8455                      (read-string "Regexp: ")))
8456   (let ((articles (gnus-find-matching-articles header regexp)))
8457     (prog1
8458         (gnus-summary-limit (nconc articles gnus-newsgroup-limit))
8459       (gnus-summary-position-point))))
8460
8461 (defun gnus-summary-insert-dormant-articles ()
8462   "Insert all the dormant articles for this group into the current buffer."
8463   (interactive)
8464   (let ((gnus-verbose (max 6 gnus-verbose)))
8465     (if (not gnus-newsgroup-dormant)
8466         (gnus-message 3 "No dormant articles for this group")
8467       (gnus-summary-goto-subjects gnus-newsgroup-dormant))))
8468
8469 (defun gnus-summary-insert-ticked-articles ()
8470   "Insert ticked articles for this group into the current buffer."
8471   (interactive)
8472   (let ((gnus-verbose (max 6 gnus-verbose)))
8473     (if (not gnus-newsgroup-marked)
8474         (gnus-message 3 "No ticked articles for this group")
8475       (gnus-summary-goto-subjects gnus-newsgroup-marked))))
8476
8477 (defun gnus-summary-limit-include-dormant ()
8478   "Display all the hidden articles that are marked as dormant.
8479 Note that this command only works on a subset of the articles currently
8480 fetched for this group."
8481   (interactive)
8482   (unless gnus-newsgroup-dormant
8483     (error "There are no dormant articles in this group"))
8484   (prog1
8485       (gnus-summary-limit (append gnus-newsgroup-dormant gnus-newsgroup-limit))
8486     (gnus-summary-position-point)))
8487
8488 (defun gnus-summary-limit-exclude-dormant ()
8489   "Hide all dormant articles."
8490   (interactive)
8491   (prog1
8492       (gnus-summary-limit-to-marks (list gnus-dormant-mark) 'reverse)
8493     (gnus-summary-position-point)))
8494
8495 (defun gnus-summary-limit-exclude-childless-dormant ()
8496   "Hide all dormant articles that have no children."
8497   (interactive)
8498   (let ((data (gnus-data-list t))
8499         articles d children)
8500     ;; Find all articles that are either not dormant or have
8501     ;; children.
8502     (while (setq d (pop data))
8503       (when (or (not (= (gnus-data-mark d) gnus-dormant-mark))
8504                 (and (setq children
8505                            (gnus-article-children (gnus-data-number d)))
8506                      (let (found)
8507                        (while children
8508                          (when (memq (car children) articles)
8509                            (setq children nil
8510                                  found t))
8511                          (pop children))
8512                        found)))
8513         (push (gnus-data-number d) articles)))
8514     ;; Do the limiting.
8515     (prog1
8516         (gnus-summary-limit articles)
8517       (gnus-summary-position-point))))
8518
8519 (defun gnus-summary-limit-mark-excluded-as-read (&optional all)
8520   "Mark all unread excluded articles as read.
8521 If ALL, mark even excluded ticked and dormants as read."
8522   (interactive "P")
8523   (setq gnus-newsgroup-limit (sort gnus-newsgroup-limit '<))
8524   (let ((articles (gnus-sorted-ndifference
8525                    (sort
8526                     (mapcar (lambda (h) (mail-header-number h))
8527                             gnus-newsgroup-headers)
8528                     '<)
8529                    gnus-newsgroup-limit))
8530         article)
8531     (setq gnus-newsgroup-unreads
8532           (gnus-sorted-intersection gnus-newsgroup-unreads
8533                                     gnus-newsgroup-limit))
8534     (if all
8535         (setq gnus-newsgroup-dormant nil
8536               gnus-newsgroup-marked nil
8537               gnus-newsgroup-reads
8538               (nconc
8539                (mapcar (lambda (n) (cons n gnus-catchup-mark)) articles)
8540                gnus-newsgroup-reads))
8541       (while (setq article (pop articles))
8542         (unless (or (memq article gnus-newsgroup-dormant)
8543                     (memq article gnus-newsgroup-marked))
8544           (push (cons article gnus-catchup-mark) gnus-newsgroup-reads))))))
8545
8546 (defun gnus-summary-limit (articles &optional pop)
8547   (if pop
8548       ;; We pop the previous limit off the stack and use that.
8549       (setq articles (car gnus-newsgroup-limits)
8550             gnus-newsgroup-limits (cdr gnus-newsgroup-limits))
8551     ;; We use the new limit, so we push the old limit on the stack.
8552     (push gnus-newsgroup-limit gnus-newsgroup-limits))
8553   ;; Set the limit.
8554   (setq gnus-newsgroup-limit articles)
8555   (let ((total (length gnus-newsgroup-data))
8556         (data (gnus-data-find-list (gnus-summary-article-number)))
8557         (gnus-summary-mark-below nil)   ; Inhibit this.
8558         found)
8559     ;; This will do all the work of generating the new summary buffer
8560     ;; according to the new limit.
8561     (gnus-summary-prepare)
8562     ;; Hide any threads, possibly.
8563     (gnus-summary-maybe-hide-threads)
8564     ;; Try to return to the article you were at, or one in the
8565     ;; neighborhood.
8566     (when data
8567       ;; We try to find some article after the current one.
8568       (while data
8569         (when (gnus-summary-goto-subject (gnus-data-number (car data)) nil t)
8570           (setq data nil
8571                 found t))
8572         (setq data (cdr data))))
8573     (unless found
8574       ;; If there is no data, that means that we were after the last
8575       ;; article.  The same goes when we can't find any articles
8576       ;; after the current one.
8577       (goto-char (point-max))
8578       (gnus-summary-find-prev))
8579     (gnus-set-mode-line 'summary)
8580     ;; We return how many articles were removed from the summary
8581     ;; buffer as a result of the new limit.
8582     (- total (length gnus-newsgroup-data))))
8583
8584 (defsubst gnus-invisible-cut-children (threads)
8585   (let ((num 0))
8586     (while threads
8587       (when (memq (mail-header-number (caar threads)) gnus-newsgroup-limit)
8588         (incf num))
8589       (pop threads))
8590     (< num 2)))
8591
8592 (defsubst gnus-cut-thread (thread)
8593   "Go forwards in the thread until we find an article that we want to display."
8594   (when (or (eq gnus-fetch-old-headers 'some)
8595             (eq gnus-fetch-old-headers 'invisible)
8596             (numberp gnus-fetch-old-headers)
8597             (eq gnus-build-sparse-threads 'some)
8598             (eq gnus-build-sparse-threads 'more))
8599     ;; Deal with old-fetched headers and sparse threads.
8600     (while (and
8601             thread
8602             (or
8603              (gnus-summary-article-sparse-p (mail-header-number (car thread)))
8604              (gnus-summary-article-ancient-p
8605               (mail-header-number (car thread))))
8606             (if (or (<= (length (cdr thread)) 1)
8607                     (eq gnus-fetch-old-headers 'invisible))
8608                 (setq gnus-newsgroup-limit
8609                       (delq (mail-header-number (car thread))
8610                             gnus-newsgroup-limit)
8611                       thread (cadr thread))
8612               (when (gnus-invisible-cut-children (cdr thread))
8613                 (let ((th (cdr thread)))
8614                   (while th
8615                     (if (memq (mail-header-number (caar th))
8616                               gnus-newsgroup-limit)
8617                         (setq thread (car th)
8618                               th nil)
8619                       (setq th (cdr th))))))))))
8620   thread)
8621
8622 (defun gnus-cut-threads (threads)
8623   "Cut off all uninteresting articles from the beginning of THREADS."
8624   (when (or (eq gnus-fetch-old-headers 'some)
8625             (eq gnus-fetch-old-headers 'invisible)
8626             (numberp gnus-fetch-old-headers)
8627             (eq gnus-build-sparse-threads 'some)
8628             (eq gnus-build-sparse-threads 'more))
8629     (let ((th threads))
8630       (while th
8631         (setcar th (gnus-cut-thread (car th)))
8632         (setq th (cdr th)))))
8633   ;; Remove nixed out threads.
8634   (delq nil threads))
8635
8636 (defun gnus-summary-initial-limit (&optional show-if-empty)
8637   "Figure out what the initial limit is supposed to be on group entry.
8638 This entails weeding out unwanted dormants, low-scored articles,
8639 fetch-old-headers verbiage, and so on."
8640   ;; Most groups have nothing to remove.
8641   (unless (or gnus-inhibit-limiting
8642               (and (null gnus-newsgroup-dormant)
8643                    (eq gnus-newsgroup-display 'gnus-not-ignore)
8644                    (not (eq gnus-fetch-old-headers 'some))
8645                    (not (numberp gnus-fetch-old-headers))
8646                    (not (eq gnus-fetch-old-headers 'invisible))
8647                    (null gnus-summary-expunge-below)
8648                    (not (eq gnus-build-sparse-threads 'some))
8649                    (not (eq gnus-build-sparse-threads 'more))
8650                    (null gnus-thread-expunge-below)
8651                    (not gnus-use-nocem)))
8652     (push gnus-newsgroup-limit gnus-newsgroup-limits)
8653     (setq gnus-newsgroup-limit nil)
8654     (mapatoms
8655      (lambda (node)
8656        (unless (car (symbol-value node))
8657          ;; These threads have no parents -- they are roots.
8658          (let ((nodes (cdr (symbol-value node)))
8659                thread)
8660            (while nodes
8661              (if (and gnus-thread-expunge-below
8662                       (< (gnus-thread-total-score (car nodes))
8663                          gnus-thread-expunge-below))
8664                  (gnus-expunge-thread (pop nodes))
8665                (setq thread (pop nodes))
8666                (gnus-summary-limit-children thread))))))
8667      gnus-newsgroup-dependencies)
8668     ;; If this limitation resulted in an empty group, we might
8669     ;; pop the previous limit and use it instead.
8670     (when (and (not gnus-newsgroup-limit)
8671                show-if-empty)
8672       (setq gnus-newsgroup-limit (pop gnus-newsgroup-limits)))
8673     gnus-newsgroup-limit))
8674
8675 (defun gnus-summary-limit-children (thread)
8676   "Return 1 if this subthread is visible and 0 if it is not."
8677   ;; First we get the number of visible children to this thread.  This
8678   ;; is done by recursing down the thread using this function, so this
8679   ;; will really go down to a leaf article first, before slowly
8680   ;; working its way up towards the root.
8681   (when thread
8682     (let* ((max-lisp-eval-depth (max 5000 max-lisp-eval-depth))
8683            (children
8684            (if (cdr thread)
8685                (apply '+ (mapcar 'gnus-summary-limit-children
8686                                  (cdr thread)))
8687              0))
8688           (number (mail-header-number (car thread)))
8689           score)
8690       (if (and
8691            (not (memq number gnus-newsgroup-marked))
8692            (or
8693             ;; If this article is dormant and has absolutely no visible
8694             ;; children, then this article isn't visible.
8695             (and (memq number gnus-newsgroup-dormant)
8696                  (zerop children))
8697             ;; If this is "fetch-old-headered" and there is no
8698             ;; visible children, then we don't want this article.
8699             (and (or (eq gnus-fetch-old-headers 'some)
8700                      (numberp gnus-fetch-old-headers))
8701                  (gnus-summary-article-ancient-p number)
8702                  (zerop children))
8703             ;; If this is "fetch-old-headered" and `invisible', then
8704             ;; we don't want this article.
8705             (and (eq gnus-fetch-old-headers 'invisible)
8706                  (gnus-summary-article-ancient-p number))
8707             ;; If this is a sparsely inserted article with no children,
8708             ;; we don't want it.
8709             (and (eq gnus-build-sparse-threads 'some)
8710                  (gnus-summary-article-sparse-p number)
8711                  (zerop children))
8712             ;; If we use expunging, and this article is really
8713             ;; low-scored, then we don't want this article.
8714             (when (and gnus-summary-expunge-below
8715                        (< (setq score
8716                                 (or (cdr (assq number gnus-newsgroup-scored))
8717                                     gnus-summary-default-score))
8718                           gnus-summary-expunge-below))
8719               ;; We increase the expunge-tally here, but that has
8720               ;; nothing to do with the limits, really.
8721               (incf gnus-newsgroup-expunged-tally)
8722               ;; We also mark as read here, if that's wanted.
8723               (when (and gnus-summary-mark-below
8724                          (< score gnus-summary-mark-below))
8725                 (setq gnus-newsgroup-unreads
8726                       (delq number gnus-newsgroup-unreads))
8727                 (if gnus-newsgroup-auto-expire
8728                     (push number gnus-newsgroup-expirable)
8729                   (push (cons number gnus-low-score-mark)
8730                         gnus-newsgroup-reads)))
8731               t)
8732             ;; Do the `display' group parameter.
8733             (and gnus-newsgroup-display
8734                  (not (funcall gnus-newsgroup-display)))
8735             ;; Check NoCeM things.
8736             (when (and gnus-use-nocem
8737                        (gnus-nocem-unwanted-article-p
8738                         (mail-header-id (car thread))))
8739               (setq gnus-newsgroup-unreads
8740                     (delq number gnus-newsgroup-unreads))
8741               t)))
8742           ;; Nope, invisible article.
8743           0
8744         ;; Ok, this article is to be visible, so we add it to the limit
8745         ;; and return 1.
8746         (push number gnus-newsgroup-limit)
8747         1))))
8748
8749 (defun gnus-expunge-thread (thread)
8750   "Mark all articles in THREAD as read."
8751   (let* ((number (mail-header-number (car thread))))
8752     (incf gnus-newsgroup-expunged-tally)
8753     ;; We also mark as read here, if that's wanted.
8754     (setq gnus-newsgroup-unreads
8755           (delq number gnus-newsgroup-unreads))
8756     (if gnus-newsgroup-auto-expire
8757         (push number gnus-newsgroup-expirable)
8758       (push (cons number gnus-low-score-mark)
8759             gnus-newsgroup-reads)))
8760   ;; Go recursively through all subthreads.
8761   (mapcar 'gnus-expunge-thread (cdr thread)))
8762
8763 ;; Summary article oriented commands
8764
8765 (defun gnus-summary-refer-parent-article (n)
8766   "Refer parent article N times.
8767 If N is negative, go to ancestor -N instead.
8768 The difference between N and the number of articles fetched is returned."
8769   (interactive "p")
8770   (let ((skip 1)
8771         error header ref)
8772     (when (not (natnump n))
8773       (setq skip (abs n)
8774             n 1))
8775     (while (and (> n 0)
8776                 (not error))
8777       (setq header (gnus-summary-article-header))
8778       (if (and (eq (mail-header-number header)
8779                    (cdr gnus-article-current))
8780                (equal gnus-newsgroup-name
8781                       (car gnus-article-current)))
8782           ;; If we try to find the parent of the currently
8783           ;; displayed article, then we take a look at the actual
8784           ;; References header, since this is slightly more
8785           ;; reliable than the References field we got from the
8786           ;; server.
8787           (with-current-buffer gnus-original-article-buffer
8788             (nnheader-narrow-to-headers)
8789             (unless (setq ref (message-fetch-field "references"))
8790               (when (setq ref (message-fetch-field "in-reply-to"))
8791                 (setq ref (gnus-extract-message-id-from-in-reply-to ref))))
8792             (widen))
8793         (setq ref
8794               ;; It's not the current article, so we take a bet on
8795               ;; the value we got from the server.
8796               (mail-header-references header)))
8797       (if (and ref
8798                (not (equal ref "")))
8799           (unless (gnus-summary-refer-article (gnus-parent-id ref skip))
8800             (gnus-message 1 "Couldn't find parent"))
8801         (gnus-message 1 "No references in article %d"
8802                       (gnus-summary-article-number))
8803         (setq error t))
8804       (decf n))
8805     (gnus-summary-position-point)
8806     n))
8807
8808 (defun gnus-summary-refer-references ()
8809   "Fetch all articles mentioned in the References header.
8810 Return the number of articles fetched."
8811   (interactive)
8812   (let ((ref (mail-header-references (gnus-summary-article-header)))
8813         (current (gnus-summary-article-number))
8814         (n 0))
8815     (if (or (not ref)
8816             (equal ref ""))
8817         (error "No References in the current article")
8818       ;; For each Message-ID in the References header...
8819       (while (string-match "<[^>]*>" ref)
8820         (incf n)
8821         ;; ... fetch that article.
8822         (gnus-summary-refer-article
8823          (prog1 (match-string 0 ref)
8824            (setq ref (substring ref (match-end 0))))))
8825       (gnus-summary-goto-subject current)
8826       (gnus-summary-position-point)
8827       n)))
8828
8829 (defun gnus-summary-refer-thread (&optional limit)
8830   "Fetch all articles in the current thread.
8831 If LIMIT (the numerical prefix), fetch that many old headers instead
8832 of what's specified by the `gnus-refer-thread-limit' variable."
8833   (interactive "P")
8834   (let ((id (mail-header-id (gnus-summary-article-header)))
8835         (limit (if limit (prefix-numeric-value limit)
8836                  gnus-refer-thread-limit)))
8837     (unless (eq gnus-fetch-old-headers 'invisible)
8838       (gnus-message 5 "Fetching headers for %s..." gnus-newsgroup-name)
8839       ;; Retrieve the headers and read them in.
8840       (if (eq (if (numberp limit)
8841                   (gnus-retrieve-headers
8842                    (list (min
8843                           (+ (mail-header-number
8844                               (gnus-summary-article-header))
8845                              limit)
8846                           gnus-newsgroup-end))
8847                    gnus-newsgroup-name (* limit 2))
8848                 ;; gnus-refer-thread-limit is t, i.e. fetch _all_
8849                 ;; headers.
8850                 (gnus-retrieve-headers (list gnus-newsgroup-end)
8851                                        gnus-newsgroup-name limit))
8852               'nov)
8853           (gnus-build-all-threads)
8854         (error "Can't fetch thread from back ends that don't support NOV"))
8855       (gnus-message 5 "Fetching headers for %s...done" gnus-newsgroup-name))
8856     (gnus-summary-limit-include-thread id)))
8857
8858 (defun gnus-summary-refer-article (message-id)
8859   "Fetch an article specified by MESSAGE-ID."
8860   (interactive "sMessage-ID: ")
8861   (when (and (stringp message-id)
8862              (not (zerop (length message-id))))
8863     (setq message-id (gnus-replace-in-string message-id " " ""))
8864     ;; Construct the correct Message-ID if necessary.
8865     ;; Suggested by tale@pawl.rpi.edu.
8866     (unless (string-match "^<" message-id)
8867       (setq message-id (concat "<" message-id)))
8868     (unless (string-match ">$" message-id)
8869       (setq message-id (concat message-id ">")))
8870     ;; People often post MIDs from URLs, so unhex it:
8871     (unless (string-match "@" message-id)
8872       (setq message-id (gnus-url-unhex-string message-id)))
8873     (let* ((header (gnus-id-to-header message-id))
8874            (sparse (and header
8875                         (gnus-summary-article-sparse-p
8876                          (mail-header-number header))
8877                         (memq (mail-header-number header)
8878                               gnus-newsgroup-limit)))
8879            number)
8880       (cond
8881        ;; If the article is present in the buffer we just go to it.
8882        ((and header
8883              (or (not (gnus-summary-article-sparse-p
8884                        (mail-header-number header)))
8885                  sparse))
8886         (prog1
8887             (gnus-summary-goto-article
8888              (mail-header-number header) nil t)
8889           (when sparse
8890             (gnus-summary-update-article (mail-header-number header)))))
8891        (t
8892         ;; We fetch the article.
8893         (catch 'found
8894           (dolist (gnus-override-method (gnus-refer-article-methods))
8895             (when (and (gnus-check-server gnus-override-method)
8896                        ;; Fetch the header,
8897                        (setq number (gnus-summary-insert-subject message-id)))
8898               ;; and display the article.
8899               (gnus-summary-select-article nil nil nil number)
8900               (throw 'found t)))
8901           (gnus-message 3 "Couldn't fetch article %s" message-id)))))))
8902
8903 (defun gnus-refer-article-methods ()
8904   "Return a list of referable methods."
8905   (cond
8906    ;; No method, so we default to current and native.
8907    ((null gnus-refer-article-method)
8908     (list gnus-current-select-method gnus-select-method))
8909    ;; Current.
8910    ((eq 'current gnus-refer-article-method)
8911     (list gnus-current-select-method))
8912    ;; List of select methods.
8913    ((not (and (symbolp (car gnus-refer-article-method))
8914               (assq (car gnus-refer-article-method) nnoo-definition-alist)))
8915     (let (out)
8916       (dolist (method gnus-refer-article-method)
8917         (push (if (eq 'current method)
8918                   gnus-current-select-method
8919                 method)
8920               out))
8921       (nreverse out)))
8922    ;; One single select method.
8923    (t
8924     (list gnus-refer-article-method))))
8925
8926 (defun gnus-summary-edit-parameters ()
8927   "Edit the group parameters of the current group."
8928   (interactive)
8929   (gnus-group-edit-group gnus-newsgroup-name 'params))
8930
8931 (defun gnus-summary-customize-parameters ()
8932   "Customize the group parameters of the current group."
8933   (interactive)
8934   (gnus-group-customize gnus-newsgroup-name))
8935
8936 (defun gnus-summary-enter-digest-group (&optional force)
8937   "Enter an nndoc group based on the current article.
8938 If FORCE, force a digest interpretation.  If not, try
8939 to guess what the document format is."
8940   (interactive "P")
8941   (let ((conf gnus-current-window-configuration))
8942     (save-window-excursion
8943       (save-excursion
8944         (let (gnus-article-prepare-hook
8945               gnus-display-mime-function
8946               gnus-break-pages)
8947           (gnus-summary-select-article))))
8948     (setq gnus-current-window-configuration conf)
8949     (let* ((name (format "%s-%d"
8950                          (gnus-group-prefixed-name
8951                           gnus-newsgroup-name (list 'nndoc ""))
8952                          (with-current-buffer gnus-summary-buffer
8953                            gnus-current-article)))
8954            (ogroup gnus-newsgroup-name)
8955            (params (append (gnus-info-params (gnus-get-info ogroup))
8956                            (list (cons 'to-group ogroup))
8957                            (list (cons 'parent-group ogroup))
8958                            (list (cons 'save-article-group ogroup))))
8959            (case-fold-search t)
8960            (buf (current-buffer))
8961            dig to-address)
8962       (with-current-buffer gnus-original-article-buffer
8963         ;; Have the digest group inherit the main mail address of
8964         ;; the parent article.
8965         (when (setq to-address (or (gnus-fetch-field "reply-to")
8966                                    (gnus-fetch-field "from")))
8967           (setq params
8968                 (append
8969                  (list (cons 'to-address
8970                              (funcall gnus-decode-encoded-address-function
8971                                       to-address))))))
8972         (setq dig (nnheader-set-temp-buffer " *gnus digest buffer*"))
8973         (insert-buffer-substring gnus-original-article-buffer)
8974         ;; Remove lines that may lead nndoc to misinterpret the
8975         ;; document type.
8976         (narrow-to-region
8977          (goto-char (point-min))
8978          (or (search-forward "\n\n" nil t) (point)))
8979         (goto-char (point-min))
8980         (delete-matching-lines "^Path:\\|^From ")
8981         (widen))
8982       (unwind-protect
8983           (if (let ((gnus-newsgroup-ephemeral-charset gnus-newsgroup-charset)
8984                     (gnus-newsgroup-ephemeral-ignored-charsets
8985                      gnus-newsgroup-ignored-charsets))
8986                 (gnus-group-read-ephemeral-group
8987                  name `(nndoc ,name (nndoc-address ,(get-buffer dig))
8988                               (nndoc-article-type
8989                                ,(if force 'mbox 'guess)))
8990                  t nil nil nil
8991                  `((adapt-file . ,(gnus-score-file-name gnus-newsgroup-name
8992                                                         "ADAPT")))))
8993               ;; Make all postings to this group go to the parent group.
8994               (nconc (gnus-info-params (gnus-get-info name))
8995                      params)
8996             ;; Couldn't select this doc group.
8997             (switch-to-buffer buf)
8998             (gnus-set-global-variables)
8999             (gnus-configure-windows 'summary)
9000             (gnus-message 3 "Article couldn't be entered?"))
9001         (kill-buffer dig)))))
9002
9003 (defun gnus-summary-read-document (n)
9004   "Open a new group based on the current article(s).
9005 This will allow you to read digests and other similar
9006 documents as newsgroups.
9007 Obeys the standard process/prefix convention."
9008   (interactive "P")
9009   (let* ((ogroup gnus-newsgroup-name)
9010          (params (append (gnus-info-params (gnus-get-info ogroup))
9011                          (list (cons 'to-group ogroup))))
9012          group egroup groups vgroup)
9013     (dolist (article (gnus-summary-work-articles n))
9014       (setq group (format "%s-%d" gnus-newsgroup-name article))
9015       (gnus-summary-remove-process-mark article)
9016       (when (gnus-summary-display-article article)
9017         (save-excursion ;;What for?
9018           (with-temp-buffer
9019             (insert-buffer-substring gnus-original-article-buffer)
9020             ;; Remove some headers that may lead nndoc to make
9021             ;; the wrong guess.
9022             (message-narrow-to-head)
9023             (goto-char (point-min))
9024             (delete-matching-lines "^Path:\\|^From ")
9025             (widen)
9026             (if (setq egroup
9027                       (gnus-group-read-ephemeral-group
9028                        group `(nndoc ,group (nndoc-address ,(current-buffer))
9029                                      (nndoc-article-type guess))
9030                        t nil t))
9031                 (progn
9032                   ;; Make all postings to this group go to the parent group.
9033                   (nconc (gnus-info-params (gnus-get-info egroup))
9034                          params)
9035                   (push egroup groups))
9036               ;; Couldn't select this doc group.
9037               (gnus-error 3 "Article couldn't be entered"))))))
9038     ;; Now we have selected all the documents.
9039     (cond
9040      ((not groups)
9041       (error "None of the articles could be interpreted as documents"))
9042      ((gnus-group-read-ephemeral-group
9043        (setq vgroup (format
9044                      "nnvirtual:%s-%s" gnus-newsgroup-name
9045                      (format-time-string "%Y%m%dT%H%M%S" (current-time))))
9046        `(nnvirtual ,vgroup (nnvirtual-component-groups ,groups))
9047        t
9048        (cons (current-buffer) 'summary)))
9049      (t
9050       (error "Couldn't select virtual nndoc group")))))
9051
9052 (defun gnus-summary-isearch-article (&optional regexp-p)
9053   "Do incremental search forward on the current article.
9054 If REGEXP-P (the prefix) is non-nil, do regexp isearch."
9055   (interactive "P")
9056   (gnus-summary-select-article)
9057   (gnus-configure-windows 'article)
9058   (gnus-eval-in-buffer-window gnus-article-buffer
9059     (save-restriction
9060       (widen)
9061       (isearch-forward regexp-p))))
9062
9063 (defun gnus-summary-repeat-search-article-forward ()
9064   "Repeat the previous search forwards."
9065   (interactive)
9066   (unless gnus-last-search-regexp
9067     (error "No previous search"))
9068   (gnus-summary-search-article-forward gnus-last-search-regexp))
9069
9070 (defun gnus-summary-repeat-search-article-backward ()
9071   "Repeat the previous search backwards."
9072   (interactive)
9073   (unless gnus-last-search-regexp
9074     (error "No previous search"))
9075   (gnus-summary-search-article-forward gnus-last-search-regexp t))
9076
9077 (defun gnus-summary-search-article-forward (regexp &optional backward)
9078   "Search for an article containing REGEXP forward.
9079 If BACKWARD, search backward instead."
9080   (interactive
9081    (list (read-string
9082           (format "Search article %s (regexp%s): "
9083                   (if current-prefix-arg "backward" "forward")
9084                   (if gnus-last-search-regexp
9085                       (concat ", default " gnus-last-search-regexp)
9086                     "")))
9087          current-prefix-arg))
9088   (if (string-equal regexp "")
9089       (setq regexp (or gnus-last-search-regexp ""))
9090     (setq gnus-last-search-regexp regexp)
9091     (setq gnus-article-before-search gnus-current-article))
9092   ;; Intentionally set gnus-last-article.
9093   (setq gnus-last-article gnus-article-before-search)
9094   (let ((gnus-last-article gnus-last-article))
9095     (if (gnus-summary-search-article regexp backward)
9096         (gnus-summary-show-thread)
9097       (signal 'search-failed (list regexp)))))
9098
9099 (defun gnus-summary-search-article-backward (regexp)
9100   "Search for an article containing REGEXP backward."
9101   (interactive
9102    (list (read-string
9103           (format "Search article backward (regexp%s): "
9104                   (if gnus-last-search-regexp
9105                       (concat ", default " gnus-last-search-regexp)
9106                     "")))))
9107   (gnus-summary-search-article-forward regexp 'backward))
9108
9109 (defun gnus-summary-search-article (regexp &optional backward)
9110   "Search for an article containing REGEXP.
9111 Optional argument BACKWARD means do search for backward.
9112 `gnus-select-article-hook' is not called during the search."
9113   ;; We have to require this here to make sure that the following
9114   ;; dynamic binding isn't shadowed by autoloading.
9115   (require 'gnus-async)
9116   (require 'gnus-art)
9117   (let ((gnus-select-article-hook nil)  ;Disable hook.
9118         (gnus-article-prepare-hook nil)
9119         (gnus-mark-article-hook nil)    ;Inhibit marking as read.
9120         (gnus-use-article-prefetch nil)
9121         (gnus-xmas-force-redisplay nil) ;Inhibit XEmacs redisplay.
9122         (gnus-use-trees nil)            ;Inhibit updating tree buffer.
9123         (gnus-visual nil)
9124         (gnus-keep-backlog nil)
9125         (gnus-break-pages nil)
9126         (gnus-summary-display-arrow nil)
9127         (gnus-updated-mode-lines nil)
9128         (gnus-auto-center-summary nil)
9129         (sum (current-buffer))
9130         (gnus-display-mime-function nil)
9131         (found nil)
9132         point)
9133     (gnus-save-hidden-threads
9134       (gnus-summary-select-article)
9135       (set-buffer gnus-article-buffer)
9136       (goto-char (window-point (get-buffer-window (current-buffer))))
9137       (when backward
9138         (forward-line -1))
9139       (while (not found)
9140         (gnus-message 7 "Searching article: %d..." (cdr gnus-article-current))
9141         (if (if backward
9142                 (re-search-backward regexp nil t)
9143               (re-search-forward regexp nil t))
9144             ;; We found the regexp.
9145             (progn
9146               (setq found 'found)
9147               (beginning-of-line)
9148               (set-window-start
9149                (get-buffer-window (current-buffer))
9150                (point))
9151               (forward-line 1)
9152               (set-window-point
9153                (get-buffer-window (current-buffer))
9154                (point))
9155               (set-buffer sum)
9156               (setq point (point)))
9157           ;; We didn't find it, so we go to the next article.
9158           (set-buffer sum)
9159           (setq found 'not)
9160           (while (eq found 'not)
9161             (if (not (if backward (gnus-summary-find-prev)
9162                        (gnus-summary-find-next)))
9163                 ;; No more articles.
9164                 (setq found t)
9165               ;; Select the next article and adjust point.
9166               (unless (gnus-summary-article-sparse-p
9167                        (gnus-summary-article-number))
9168                 (setq found nil)
9169                 (gnus-summary-select-article)
9170                 (set-buffer gnus-article-buffer)
9171                 (widen)
9172                 (goto-char (if backward (point-max) (point-min))))))))
9173       (gnus-message 7 ""))
9174     ;; Return whether we found the regexp.
9175     (when (eq found 'found)
9176       (goto-char point)
9177       (gnus-summary-show-thread)
9178       (gnus-summary-goto-subject gnus-current-article)
9179       (gnus-summary-position-point)
9180       t)))
9181
9182 (defun gnus-find-matching-articles (header regexp)
9183   "Return a list of all articles that match REGEXP on HEADER.
9184 This search includes all articles in the current group that Gnus has
9185 fetched headers for, whether they are displayed or not."
9186   (let ((articles nil)
9187         ;; Can't eta-reduce because it's a macro.
9188         (func `(lambda (h) (,(intern (concat "mail-header-" header)) h)))
9189         (case-fold-search t))
9190     (dolist (header gnus-newsgroup-headers)
9191       (when (string-match regexp (funcall func header))
9192         (push (mail-header-number header) articles)))
9193     (nreverse articles)))
9194
9195 (defun gnus-summary-find-matching (header regexp &optional backward unread
9196                                           not-case-fold not-matching)
9197   "Return a list of all articles that match REGEXP on HEADER.
9198 The search stars on the current article and goes forwards unless
9199 BACKWARD is non-nil.  If BACKWARD is `all', do all articles.
9200 If UNREAD is non-nil, only unread articles will
9201 be taken into consideration.  If NOT-CASE-FOLD, case won't be folded
9202 in the comparisons. If NOT-MATCHING, return a list of all articles that
9203 not match REGEXP on HEADER."
9204   (let ((case-fold-search (not not-case-fold))
9205         articles d func)
9206     (if (consp header)
9207         (if (eq (car header) 'extra)
9208             (setq func
9209                   `(lambda (h)
9210                      (or (cdr (assq ',(cdr header) (mail-header-extra h)))
9211                          "")))
9212           (error "%s is an invalid header" header))
9213       (unless (fboundp (intern (concat "mail-header-" header)))
9214         (error "%s is not a valid header" header))
9215       (setq func `(lambda (h) (,(intern (concat "mail-header-" header)) h))))
9216     (dolist (d (if (eq backward 'all)
9217                    gnus-newsgroup-data
9218                  (gnus-data-find-list
9219                   (gnus-summary-article-number)
9220                   (gnus-data-list backward))))
9221       (when (and (or (not unread)       ; We want all articles...
9222                      (gnus-data-unread-p d)) ; Or just unreads.
9223                  (vectorp (gnus-data-header d)) ; It's not a pseudo.
9224                  (if not-matching
9225                      (not (string-match
9226                            regexp
9227                            (funcall func (gnus-data-header d))))
9228                    (string-match regexp
9229                                  (funcall func (gnus-data-header d)))))
9230         (push (gnus-data-number d) articles))) ; Success!
9231     (nreverse articles)))
9232
9233 (defun gnus-summary-execute-command (header regexp command &optional backward)
9234   "Search forward for an article whose HEADER matches REGEXP and execute COMMAND.
9235 If HEADER is an empty string (or nil), the match is done on the entire
9236 article.  If BACKWARD (the prefix) is non-nil, search backward instead."
9237   (interactive
9238    (list (let ((completion-ignore-case t))
9239            (completing-read
9240             "Header name: "
9241             (mapcar (lambda (header) (list (format "%s" header)))
9242                     (append
9243                      '("Number" "Subject" "From" "Lines" "Date"
9244                        "Message-ID" "Xref" "References" "Body")
9245                      gnus-extra-headers))
9246             nil 'require-match))
9247          (read-string "Regexp: ")
9248          (read-key-sequence "Command: ")
9249          current-prefix-arg))
9250   (when (equal header "Body")
9251     (setq header ""))
9252   ;; Hidden thread subtrees must be searched as well.
9253   (gnus-summary-show-all-threads)
9254   ;; We don't want to change current point nor window configuration.
9255   (save-excursion
9256     (save-window-excursion
9257       (let (gnus-visual
9258             gnus-treat-strip-trailing-blank-lines
9259             gnus-treat-strip-leading-blank-lines
9260             gnus-treat-strip-multiple-blank-lines
9261             gnus-treat-hide-boring-headers
9262             gnus-treat-fold-newsgroups
9263             gnus-article-prepare-hook)
9264         (gnus-message 6 "Executing %s..." (key-description command))
9265         ;; We'd like to execute COMMAND interactively so as to give arguments.
9266         (gnus-execute header regexp
9267                       `(call-interactively ',(key-binding command))
9268                       backward)
9269         (gnus-message 6 "Executing %s...done" (key-description command))))))
9270
9271 (defun gnus-summary-beginning-of-article ()
9272   "Scroll the article back to the beginning."
9273   (interactive)
9274   (gnus-summary-select-article)
9275   (gnus-configure-windows 'article)
9276   (gnus-eval-in-buffer-window gnus-article-buffer
9277     (widen)
9278     (goto-char (point-min))
9279     (when gnus-break-pages
9280       (gnus-narrow-to-page))))
9281
9282 (defun gnus-summary-end-of-article ()
9283   "Scroll to the end of the article."
9284   (interactive)
9285   (gnus-summary-select-article)
9286   (gnus-configure-windows 'article)
9287   (gnus-eval-in-buffer-window gnus-article-buffer
9288     (widen)
9289     (goto-char (point-max))
9290     (recenter -3)
9291     (when gnus-break-pages
9292       (gnus-narrow-to-page))))
9293
9294 (defun gnus-summary-print-truncate-and-quote (string &optional len)
9295   "Truncate to LEN and quote all \"(\"'s in STRING."
9296   (gnus-replace-in-string (if (and len (> (length string) len))
9297                               (substring string 0 len)
9298                             string)
9299                           "[()]" "\\\\\\&"))
9300
9301 (defun gnus-summary-print-article (&optional filename n)
9302   "Generate and print a PostScript image of the process-marked (mail) articles.
9303
9304 If used interactively, print the current article if none are
9305 process-marked.  With prefix arg, prompt the user for the name of the
9306 file to save in.
9307
9308 When used from Lisp, accept two optional args FILENAME and N.  N means
9309 to print the next N articles.  If N is negative, print the N previous
9310 articles.  If N is nil and articles have been marked with the process
9311 mark, print these instead.
9312
9313 If the optional first argument FILENAME is nil, send the image to the
9314 printer.  If FILENAME is a string, save the PostScript image in a file with
9315 that name.  If FILENAME is a number, prompt the user for the name of the file
9316 to save in."
9317   (interactive (list (ps-print-preprint current-prefix-arg)))
9318   (dolist (article (gnus-summary-work-articles n))
9319     (gnus-summary-select-article nil nil 'pseudo article)
9320     (gnus-eval-in-buffer-window gnus-article-buffer
9321       (gnus-print-buffer))
9322     (gnus-summary-remove-process-mark article))
9323   (ps-despool filename))
9324
9325 (defun gnus-print-buffer ()
9326   (let ((buffer (generate-new-buffer " *print*")))
9327     (unwind-protect
9328         (progn
9329           (copy-to-buffer buffer (point-min) (point-max))
9330           (set-buffer buffer)
9331           (gnus-remove-text-with-property 'gnus-decoration)
9332           (when (gnus-visual-p 'article-highlight 'highlight)
9333             ;; Copy-to-buffer doesn't copy overlay.  So redo
9334             ;; highlight.
9335             (let ((gnus-article-buffer buffer))
9336               (gnus-article-highlight-citation t)
9337               (gnus-article-highlight-signature)
9338               (gnus-article-emphasize)
9339               (gnus-article-delete-invisible-text)))
9340           (let ((ps-left-header
9341                  (list
9342                   (concat "("
9343                           (gnus-summary-print-truncate-and-quote
9344                            (mail-header-subject gnus-current-headers)
9345                            66) ")")
9346                   (concat "("
9347                           (gnus-summary-print-truncate-and-quote
9348                            (mail-header-from gnus-current-headers)
9349                            45) ")")))
9350                 (ps-right-header
9351                  (list
9352                   "/pagenumberstring load"
9353                   (concat "("
9354                           (mail-header-date gnus-current-headers) ")"))))
9355             (gnus-run-hooks 'gnus-ps-print-hook)
9356             (save-excursion
9357               (if ps-print-color-p
9358                   (ps-spool-buffer-with-faces)
9359                 (ps-spool-buffer)))))
9360       (kill-buffer buffer))))
9361
9362 (defun gnus-summary-show-article (&optional arg)
9363   "Force redisplaying of the current article.
9364 If ARG (the prefix) is a number, show the article with the charset
9365 defined in `gnus-summary-show-article-charset-alist', or the charset
9366 input.
9367 If ARG (the prefix) is non-nil and not a number, show the raw article
9368 without any article massaging functions being run.  Normally, the key
9369 strokes are `C-u g'."
9370   (interactive "P")
9371   (cond
9372    ((numberp arg)
9373     (gnus-summary-show-article t)
9374     (let ((gnus-newsgroup-charset
9375            (or (cdr (assq arg gnus-summary-show-article-charset-alist))
9376                (mm-read-coding-system
9377                 "View as charset: " ;; actually it is coding system.
9378                 (with-current-buffer gnus-article-buffer
9379                   (mm-detect-coding-region (point) (point-max))))))
9380           (gnus-newsgroup-ignored-charsets 'gnus-all))
9381       (gnus-summary-select-article nil 'force)
9382       (let ((deps gnus-newsgroup-dependencies)
9383             head header lines)
9384         (with-current-buffer gnus-original-article-buffer
9385           (save-restriction
9386             (message-narrow-to-head)
9387             (setq head (buffer-string))
9388             (goto-char (point-min))
9389             (unless (re-search-forward "^lines:[ \t]\\([0-9]+\\)" nil t)
9390               (goto-char (point-max))
9391               (widen)
9392               (setq lines (1- (count-lines (point) (point-max))))))
9393           (with-temp-buffer
9394             (insert (format "211 %d Article retrieved.\n"
9395                             (cdr gnus-article-current)))
9396             (insert head)
9397             (if lines (insert (format "Lines: %d\n" lines)))
9398             (insert ".\n")
9399             (let ((nntp-server-buffer (current-buffer)))
9400               (setq header (car (gnus-get-newsgroup-headers deps t))))))
9401         (gnus-data-set-header
9402          (gnus-data-find (cdr gnus-article-current))
9403          header)
9404         (gnus-summary-update-article-line
9405          (cdr gnus-article-current) header)
9406         (when (gnus-summary-goto-subject (cdr gnus-article-current) nil t)
9407           (gnus-summary-update-secondary-mark (cdr gnus-article-current))))))
9408    ((not arg)
9409     ;; Select the article the normal way.
9410     (gnus-summary-select-article nil 'force))
9411    (t
9412     ;; We have to require this here to make sure that the following
9413     ;; dynamic binding isn't shadowed by autoloading.
9414     (require 'gnus-async)
9415     (require 'gnus-art)
9416     ;; Bind the article treatment functions to nil.
9417     (let ((gnus-have-all-headers t)
9418           gnus-article-prepare-hook
9419           gnus-article-decode-hook
9420           gnus-display-mime-function
9421           gnus-break-pages)
9422       ;; Destroy any MIME parts.
9423       (when (gnus-buffer-live-p gnus-article-buffer)
9424         (with-current-buffer gnus-article-buffer
9425           (mm-destroy-parts gnus-article-mime-handles)
9426           ;; Set it to nil for safety reason.
9427           (setq gnus-article-mime-handle-alist nil)
9428           (setq gnus-article-mime-handles nil)))
9429       (gnus-summary-select-article nil 'force))))
9430   (gnus-summary-goto-subject gnus-current-article)
9431   (gnus-summary-position-point))
9432
9433 (defun gnus-summary-show-raw-article ()
9434   "Show the raw article without any article massaging functions being run."
9435   (interactive)
9436   (gnus-summary-show-article t))
9437
9438 (defun gnus-summary-verbose-headers (&optional arg)
9439   "Toggle permanent full header display.
9440 If ARG is a positive number, turn header display on.
9441 If ARG is a negative number, turn header display off."
9442   (interactive "P")
9443   (setq gnus-show-all-headers
9444         (cond ((or (not (numberp arg))
9445                    (zerop arg))
9446                (not gnus-show-all-headers))
9447               ((natnump arg)
9448                t)))
9449   (gnus-summary-show-article))
9450
9451 (defun gnus-summary-toggle-header (&optional arg)
9452   "Show the headers if they are hidden, or hide them if they are shown.
9453 If ARG is a positive number, show the entire header.
9454 If ARG is a negative number, hide the unwanted header lines."
9455   (interactive "P")
9456   (let ((window (and (gnus-buffer-live-p gnus-article-buffer)
9457                      (get-buffer-window gnus-article-buffer t))))
9458     (with-current-buffer gnus-article-buffer
9459       (widen)
9460       (article-narrow-to-head)
9461       (let* ((inhibit-read-only t)
9462              (inhibit-point-motion-hooks t)
9463              (hidden (if (numberp arg)
9464                          (>= arg 0)
9465                        (or (not (looking-at "[^ \t\n]+:"))
9466                            (gnus-article-hidden-text-p 'headers))))
9467              s e)
9468         (delete-region (point-min) (point-max))
9469         (with-current-buffer gnus-original-article-buffer
9470           (goto-char (setq s (point-min)))
9471           (setq e (if (search-forward "\n\n" nil t)
9472                       (1- (point))
9473                     (point-max))))
9474         (insert-buffer-substring gnus-original-article-buffer s e)
9475         (run-hooks 'gnus-article-decode-hook)
9476         (if hidden
9477             (let ((gnus-treat-hide-headers nil)
9478                   (gnus-treat-hide-boring-headers nil))
9479               (gnus-delete-wash-type 'headers)
9480               (gnus-treat-article 'head))
9481           (gnus-treat-article 'head))
9482         (widen)
9483         (if window
9484             (set-window-start window (goto-char (point-min))))
9485         (if gnus-break-pages
9486             (gnus-narrow-to-page)
9487           (when (gnus-visual-p 'page-marker)
9488             (let ((inhibit-read-only t))
9489               (gnus-remove-text-with-property 'gnus-prev)
9490               (gnus-remove-text-with-property 'gnus-next))))
9491         (gnus-set-mode-line 'article)))))
9492
9493 (defun gnus-summary-show-all-headers ()
9494   "Make all header lines visible."
9495   (interactive)
9496   (gnus-summary-toggle-header 1))
9497
9498 (defun gnus-summary-caesar-message (&optional arg)
9499   "Caesar rotate the current article by 13.
9500 With a non-numerical prefix, also rotate headers.  A numerical
9501 prefix specifies how many places to rotate each letter forward."
9502   (interactive "P")
9503   (gnus-summary-select-article)
9504   (let ((mail-header-separator ""))
9505     (gnus-eval-in-buffer-window gnus-article-buffer
9506       (save-restriction
9507         (widen)
9508         (let ((start (window-start))
9509               (inhibit-read-only t))
9510           (if (equal arg '(4))
9511               (message-caesar-buffer-body nil t)
9512             (message-caesar-buffer-body arg))
9513           (set-window-start (get-buffer-window (current-buffer)) start)))))
9514   ;; Create buttons and stuff...
9515   (gnus-treat-article nil))
9516
9517 (declare-function idna-to-unicode "ext:idna" (str))
9518
9519 (defun gnus-summary-idna-message (&optional arg)
9520   "Decode IDNA encoded domain names in the current articles.
9521 IDNA encoded domain names looks like `xn--bar'.  If a string
9522 remain unencoded after running this function, it is likely an
9523 invalid IDNA string (`xn--bar' is invalid).
9524
9525 You must have GNU Libidn (URL `http://www.gnu.org/software/libidn/')
9526 installed for this command to work."
9527   (interactive "P")
9528   (if (not (and (condition-case nil (require 'idna)
9529                   (file-error))
9530                 (mm-coding-system-p 'utf-8)
9531                 (executable-find (symbol-value 'idna-program))))
9532       (gnus-message
9533        5 "GNU Libidn not installed properly (`idn' or `idna.el' missing)")
9534     (gnus-summary-select-article)
9535     (let ((mail-header-separator ""))
9536       (gnus-eval-in-buffer-window gnus-article-buffer
9537         (save-restriction
9538           (widen)
9539           (let ((start (window-start))
9540                 buffer-read-only)
9541             (while (re-search-forward "\\(xn--[-0-9a-z]+\\)" nil t)
9542               (replace-match (idna-to-unicode (match-string 1))))
9543             (set-window-start (get-buffer-window (current-buffer)) start)))))))
9544
9545 (defun gnus-summary-morse-message (&optional arg)
9546   "Morse decode the current article."
9547   (interactive "P")
9548   (gnus-summary-select-article)
9549   (let ((mail-header-separator ""))
9550     (gnus-eval-in-buffer-window gnus-article-buffer
9551       (save-excursion
9552         (save-restriction
9553           (widen)
9554           (let ((pos (window-start))
9555                 (inhibit-read-only t))
9556             (goto-char (point-min))
9557             (when (message-goto-body)
9558               (gnus-narrow-to-body))
9559             (goto-char (point-min))
9560             (while (search-forward "·" (point-max) t)
9561               (replace-match "."))
9562             (unmorse-region (point-min) (point-max))
9563             (widen)
9564             (set-window-start (get-buffer-window (current-buffer)) pos)))))))
9565
9566 (defun gnus-summary-stop-page-breaking ()
9567   "Stop page breaking in the current article."
9568   (interactive)
9569   (gnus-summary-select-article)
9570   (gnus-eval-in-buffer-window gnus-article-buffer
9571     (widen)
9572     (when (gnus-visual-p 'page-marker)
9573       (let ((inhibit-read-only t))
9574         (gnus-remove-text-with-property 'gnus-prev)
9575         (gnus-remove-text-with-property 'gnus-next))
9576       (setq gnus-page-broken nil))))
9577
9578 (defun gnus-summary-move-article (&optional n to-newsgroup
9579                                             select-method action)
9580   "Move the current article to a different newsgroup.
9581 If N is a positive number, move the N next articles.
9582 If N is a negative number, move the N previous articles.
9583 If N is nil and any articles have been marked with the process mark,
9584 move those articles instead.
9585 If TO-NEWSGROUP is string, do not prompt for a newsgroup to move to.
9586 If SELECT-METHOD is non-nil, do not move to a specific newsgroup, but
9587 re-spool using this method.
9588
9589 When called interactively with TO-NEWSGROUP being nil, the value of
9590 the variable `gnus-move-split-methods' is used for finding a default
9591 for the target newsgroup.
9592
9593 For this function to work, both the current newsgroup and the
9594 newsgroup that you want to move to have to support the `request-move'
9595 and `request-accept' functions.
9596
9597 ACTION can be either `move' (the default), `crosspost' or `copy'."
9598   (interactive "P")
9599   (unless action
9600     (setq action 'move))
9601   ;; Check whether the source group supports the required functions.
9602   (cond ((and (eq action 'move)
9603               (not (gnus-check-backend-function
9604                     'request-move-article gnus-newsgroup-name)))
9605          (error "The current group does not support article moving"))
9606         ((and (eq action 'crosspost)
9607               (not (gnus-check-backend-function
9608                     'request-replace-article gnus-newsgroup-name)))
9609          (error "The current group does not support article editing")))
9610   (let ((articles (gnus-summary-work-articles n))
9611         (prefix (if (gnus-check-backend-function
9612                      'request-move-article gnus-newsgroup-name)
9613                     (funcall gnus-move-group-prefix-function
9614                              gnus-newsgroup-name)
9615                   ""))
9616         (names '((move "Move" "Moving")
9617                  (copy "Copy" "Copying")
9618                  (crosspost "Crosspost" "Crossposting")))
9619         (copy-buf (save-excursion
9620                     (nnheader-set-temp-buffer " *copy article*")))
9621         art-group to-method new-xref article to-groups
9622         articles-to-update-marks encoded)
9623     (unless (assq action names)
9624       (error "Unknown action %s" action))
9625     ;; Read the newsgroup name.
9626     (when (and (not to-newsgroup)
9627                (not select-method))
9628       (if (and gnus-move-split-methods
9629                (not
9630                 (and (memq gnus-current-article articles)
9631                      (gnus-buffer-live-p gnus-original-article-buffer))))
9632           ;; When `gnus-move-split-methods' is non-nil, we have to
9633           ;; select an article to give `gnus-read-move-group-name' an
9634           ;; opportunity to suggest an appropriate default.  However,
9635           ;; we needn't render or mark the article.
9636           (let ((gnus-display-mime-function nil)
9637                 (gnus-article-prepare-hook nil)
9638                 (gnus-mark-article-hook nil))
9639             (gnus-summary-select-article nil nil nil (car articles))))
9640       (setq to-newsgroup (gnus-read-move-group-name
9641                           (cadr (assq action names))
9642                           (symbol-value
9643                            (intern (format "gnus-current-%s-group" action)))
9644                           articles prefix)
9645             encoded to-newsgroup
9646             to-method (gnus-server-to-method (gnus-group-method to-newsgroup)))
9647       (set (intern (format "gnus-current-%s-group" action))
9648            (mm-decode-coding-string
9649             to-newsgroup
9650             (gnus-group-name-charset to-method to-newsgroup))))
9651     (unless to-method
9652       (setq to-method (or select-method
9653                           (gnus-server-to-method
9654                            (gnus-group-method to-newsgroup)))))
9655     (setq to-newsgroup
9656           (or encoded
9657               (and to-newsgroup
9658                    (mm-encode-coding-string
9659                     to-newsgroup
9660                     (gnus-group-name-charset to-method to-newsgroup)))))
9661     ;; Check the method we are to move this article to...
9662     (unless (gnus-check-backend-function
9663              'request-accept-article (car to-method))
9664       (error "%s does not support article copying" (car to-method)))
9665     (unless (gnus-check-server to-method)
9666       (error "Can't open server %s" (car to-method)))
9667     (gnus-message 6 "%s to %s: %s..."
9668                   (caddr (assq action names))
9669                   (or (car select-method)
9670                       (gnus-group-decoded-name to-newsgroup))
9671                   articles)
9672     (while articles
9673       (setq article (pop articles))
9674       (setq
9675        art-group
9676        (cond
9677         ;; Move the article.
9678         ((eq action 'move)
9679          ;; Remove this article from future suppression.
9680          (gnus-dup-unsuppress-article article)
9681          (let* ((from-method (gnus-find-method-for-group
9682                               gnus-newsgroup-name))
9683                 (to-method (or select-method
9684                                (gnus-find-method-for-group to-newsgroup)))
9685                 (move-is-internal (gnus-method-equal from-method to-method)))
9686            (gnus-request-move-article
9687             article                     ; Article to move
9688             gnus-newsgroup-name         ; From newsgroup
9689             (nth 1 (gnus-find-method-for-group
9690                     gnus-newsgroup-name)) ; Server
9691             (list 'gnus-request-accept-article
9692                   to-newsgroup (list 'quote select-method)
9693                   (not articles) t)     ; Accept form
9694             (not articles)              ; Only save nov last time
9695             move-is-internal)))         ; is this move internal?
9696         ;; Copy the article.
9697         ((eq action 'copy)
9698          (with-current-buffer copy-buf
9699            (when (gnus-request-article-this-buffer article gnus-newsgroup-name)
9700              (save-restriction
9701                (nnheader-narrow-to-headers)
9702                (dolist (hdr gnus-copy-article-ignored-headers)
9703                  (message-remove-header hdr t)))
9704              (gnus-request-accept-article
9705               to-newsgroup select-method (not articles) t))))
9706         ;; Crosspost the article.
9707         ((eq action 'crosspost)
9708          (let ((xref (message-tokenize-header
9709                       (mail-header-xref (gnus-summary-article-header article))
9710                       " ")))
9711            (setq new-xref (concat (gnus-group-real-name gnus-newsgroup-name)
9712                                   ":" (number-to-string article)))
9713            (unless xref
9714              (setq xref (list (system-name))))
9715            (setq new-xref
9716                  (concat
9717                   (mapconcat 'identity
9718                              (delete "Xref:" (delete new-xref xref))
9719                              " ")
9720                   " " new-xref))
9721            (with-current-buffer copy-buf
9722              ;; First put the article in the destination group.
9723              (gnus-request-article-this-buffer article gnus-newsgroup-name)
9724              (when (consp (setq art-group
9725                                 (gnus-request-accept-article
9726                                  to-newsgroup select-method (not articles) t)))
9727                (setq new-xref (concat new-xref " " (car art-group)
9728                                       ":"
9729                                       (number-to-string (cdr art-group))))
9730                ;; Now we have the new Xrefs header, so we insert
9731                ;; it and replace the new article.
9732                (nnheader-replace-header "Xref" new-xref)
9733                (gnus-request-replace-article
9734                 (cdr art-group) to-newsgroup (current-buffer) t)
9735                art-group))))))
9736       (cond
9737        ((not art-group)
9738         (gnus-message 1 "Couldn't %s article %s: %s"
9739                       (cadr (assq action names)) article
9740                       (nnheader-get-report (car to-method))))
9741        ((eq art-group 'junk)
9742         (when (eq action 'move)
9743           (gnus-summary-mark-article article gnus-canceled-mark)
9744           (gnus-message 4 "Deleted article %s" article)
9745           ;; run the delete hook
9746           (run-hook-with-args 'gnus-summary-article-delete-hook
9747                               action
9748                               (gnus-data-header
9749                                (assoc article (gnus-data-list nil)))
9750                               gnus-newsgroup-name nil
9751                               select-method)))
9752        (t
9753         (let* ((pto-group (gnus-group-prefixed-name
9754                            (car art-group) to-method))
9755                (info (gnus-get-info pto-group))
9756                (to-group (gnus-info-group info))
9757                to-marks)
9758           ;; Update the group that has been moved to.
9759           (when (and info
9760                      (memq action '(move copy)))
9761             (unless (member to-group to-groups)
9762               (push to-group to-groups))
9763
9764             (unless (memq article gnus-newsgroup-unreads)
9765               (push 'read to-marks)
9766               (gnus-info-set-read
9767                info (gnus-add-to-range (gnus-info-read info)
9768                                        (list (cdr art-group)))))
9769
9770             ;; See whether the article is to be put in the cache.
9771             (let* ((expirable (gnus-group-auto-expirable-p to-group))
9772                    (marks (if expirable
9773                               gnus-article-mark-lists
9774                             (delete '(expirable . expire)
9775                                     (copy-sequence gnus-article-mark-lists))))
9776                    (to-article (cdr art-group)))
9777
9778               ;; Enter the article into the cache in the new group,
9779               ;; if that is required.
9780               (when gnus-use-cache
9781                 (gnus-cache-possibly-enter-article
9782                  to-group to-article
9783                  (memq article gnus-newsgroup-marked)
9784                  (memq article gnus-newsgroup-dormant)
9785                  (memq article gnus-newsgroup-unreads)))
9786
9787               (when gnus-preserve-marks
9788                 ;; Copy any marks over to the new group.
9789                 (when (and (equal to-group gnus-newsgroup-name)
9790                            (not (memq article gnus-newsgroup-unreads)))
9791                   ;; Mark this article as read in this group.
9792                   (push (cons to-article gnus-read-mark) gnus-newsgroup-reads)
9793                   (setcdr (gnus-active to-group) to-article)
9794                   (setcdr gnus-newsgroup-active to-article))
9795
9796                 (while marks
9797                   (when (eq (gnus-article-mark-to-type (cdar marks)) 'list)
9798                     (when (memq article (symbol-value
9799                                          (intern (format "gnus-newsgroup-%s"
9800                                                          (caar marks)))))
9801                       (push (cdar marks) to-marks)
9802                       ;; If the other group is the same as this group,
9803                       ;; then we have to add the mark to the list.
9804                       (when (equal to-group gnus-newsgroup-name)
9805                         (set (intern (format "gnus-newsgroup-%s" (caar marks)))
9806                              (cons to-article
9807                                    (symbol-value
9808                                     (intern (format "gnus-newsgroup-%s"
9809                                                     (caar marks)))))))
9810                       ;; Copy the marks to other group.
9811                       (gnus-add-marked-articles
9812                        to-group (cdar marks) (list to-article) info)))
9813                   (setq marks (cdr marks)))
9814
9815                 (when (and expirable
9816                            gnus-mark-copied-or-moved-articles-as-expirable
9817                            (not (memq 'expire to-marks)))
9818                   ;; Mark this article as expirable.
9819                   (push 'expire to-marks)
9820                   (when (equal to-group gnus-newsgroup-name)
9821                     (push to-article gnus-newsgroup-expirable))
9822                   ;; Copy the expirable mark to other group.
9823                   (gnus-add-marked-articles
9824                    to-group 'expire (list to-article) info))
9825
9826                 (gnus-request-set-mark
9827                  to-group (list (list (list to-article) 'add to-marks))))
9828
9829               (gnus-dribble-enter
9830                (concat "(gnus-group-set-info '"
9831                        (gnus-prin1-to-string (gnus-get-info to-group))
9832                        ")"))))
9833
9834           ;; Update the Xref header in this article to point to
9835           ;; the new crossposted article we have just created.
9836           (when (eq action 'crosspost)
9837             (with-current-buffer copy-buf
9838               (gnus-request-article-this-buffer article gnus-newsgroup-name)
9839               (nnheader-replace-header "Xref" new-xref)
9840               (gnus-request-replace-article
9841                article gnus-newsgroup-name (current-buffer) t)))
9842
9843           ;; run the move/copy/crosspost/respool hook
9844           (run-hook-with-args 'gnus-summary-article-move-hook
9845                               action
9846                               (gnus-data-header
9847                                (assoc article (gnus-data-list nil)))
9848                               gnus-newsgroup-name
9849                               to-newsgroup
9850                               select-method))
9851
9852         ;;;!!!Why is this necessary?
9853         (set-buffer gnus-summary-buffer)
9854
9855         (when (eq action 'move)
9856           (save-excursion
9857             (gnus-summary-goto-subject article)
9858             (gnus-summary-mark-article article gnus-canceled-mark)))))
9859       (push article articles-to-update-marks))
9860
9861     (save-excursion
9862       (apply 'gnus-summary-remove-process-mark articles-to-update-marks))
9863     ;; Re-activate all groups that have been moved to.
9864     (with-current-buffer gnus-group-buffer
9865       (let ((gnus-group-marked to-groups))
9866         (gnus-group-get-new-news-this-group nil t)))
9867
9868     (gnus-kill-buffer copy-buf)
9869     (gnus-summary-position-point)
9870     (gnus-set-mode-line 'summary)))
9871
9872 (defun gnus-summary-copy-article (&optional n to-newsgroup select-method)
9873   "Copy the current article to some other group.
9874 If TO-NEWSGROUP is string, do not prompt for a newsgroup to copy to.
9875 When called interactively, if TO-NEWSGROUP is nil, use the value of
9876 the variable `gnus-move-split-methods' for finding a default target
9877 newsgroup.
9878 If SELECT-METHOD is non-nil, do not move to a specific newsgroup, but
9879 re-spool using this method."
9880   (interactive "P")
9881   (gnus-summary-move-article n to-newsgroup select-method 'copy))
9882
9883 (defun gnus-summary-crosspost-article (&optional n)
9884   "Crosspost the current article to some other group."
9885   (interactive "P")
9886   (gnus-summary-move-article n nil nil 'crosspost))
9887
9888 (defcustom gnus-summary-respool-default-method nil
9889   "Default method type for respooling an article.
9890 If nil, use to the current newsgroup method."
9891   :type 'symbol
9892   :group 'gnus-summary-mail)
9893
9894 (defun gnus-summary-respool-article (&optional n method)
9895   "Respool the current article.
9896 The article will be squeezed through the mail spooling process again,
9897 which means that it will be put in some mail newsgroup or other
9898 depending on `nnmail-split-methods'.
9899 If N is a positive number, respool the N next articles.
9900 If N is a negative number, respool the N previous articles.
9901 If N is nil and any articles have been marked with the process mark,
9902 respool those articles instead.
9903
9904 Respooling can be done both from mail groups and \"real\" newsgroups.
9905 In the former case, the articles in question will be moved from the
9906 current group into whatever groups they are destined to.  In the
9907 latter case, they will be copied into the relevant groups."
9908   (interactive
9909    (list current-prefix-arg
9910          (let* ((methods (gnus-methods-using 'respool))
9911                 (methname
9912                  (symbol-name (or gnus-summary-respool-default-method
9913                                   (car (gnus-find-method-for-group
9914                                         gnus-newsgroup-name)))))
9915                 (method
9916                  (gnus-completing-read-with-default
9917                   methname "Backend to use when respooling"
9918                   methods nil t nil 'gnus-mail-method-history))
9919                 ms)
9920            (cond
9921             ((zerop (length (setq ms (gnus-servers-using-backend
9922                                       (intern method)))))
9923              (list (intern method) ""))
9924             ((= 1 (length ms))
9925              (car ms))
9926             (t
9927              (let ((ms-alist (mapcar (lambda (m) (cons (cadr m) m)) ms)))
9928                (cdr (assoc (completing-read "Server name: " ms-alist nil t)
9929                            ms-alist))))))))
9930   (unless method
9931     (error "No method given for respooling"))
9932   (if (assoc (symbol-name
9933               (car (gnus-find-method-for-group gnus-newsgroup-name)))
9934              (gnus-methods-using 'respool))
9935       (gnus-summary-move-article n nil method)
9936     (gnus-summary-copy-article n nil method)))
9937
9938 (defun gnus-summary-import-article (file &optional edit)
9939   "Import an arbitrary file into a mail newsgroup."
9940   (interactive "fImport file: \nP")
9941   (let ((group gnus-newsgroup-name)
9942         (now (current-time))
9943         atts lines group-art)
9944     (unless (gnus-check-backend-function 'request-accept-article group)
9945       (error "%s does not support article importing" group))
9946     (or (file-readable-p file)
9947         (not (file-regular-p file))
9948         (error "Can't read %s" file))
9949     (with-current-buffer (gnus-get-buffer-create " *import file*")
9950       (erase-buffer)
9951       (nnheader-insert-file-contents file)
9952       (goto-char (point-min))
9953       (if (nnheader-article-p)
9954           (save-restriction
9955             (goto-char (point-min))
9956             (search-forward "\n\n" nil t)
9957             (narrow-to-region (point-min) (1- (point)))
9958             (goto-char (point-min))
9959             (unless (re-search-forward "^date:" nil t)
9960               (goto-char (point-max))
9961               (insert "Date: " (message-make-date (nth 5 atts)) "\n")))
9962        ;; This doesn't look like an article, so we fudge some headers.
9963         (setq atts (file-attributes file)
9964               lines (count-lines (point-min) (point-max)))
9965         (insert "From: " (read-string "From: ") "\n"
9966                 "Subject: " (read-string "Subject: ") "\n"
9967                 "Date: " (message-make-date (nth 5 atts)) "\n"
9968                 "Message-ID: " (message-make-message-id) "\n"
9969                 "Lines: " (int-to-string lines) "\n"
9970                 "Chars: " (int-to-string (nth 7 atts)) "\n\n"))
9971       (setq group-art (gnus-request-accept-article group nil t))
9972       (kill-buffer (current-buffer)))
9973     (setq gnus-newsgroup-active (gnus-activate-group group))
9974     (forward-line 1)
9975     (gnus-summary-goto-article (cdr group-art) nil t)
9976     (when edit
9977       (gnus-summary-edit-article))))
9978
9979 (defun gnus-summary-create-article ()
9980   "Create an article in a mail newsgroup."
9981   (interactive)
9982   (let ((group gnus-newsgroup-name)
9983         (now (current-time))
9984         group-art)
9985     (unless (gnus-check-backend-function 'request-accept-article group)
9986       (error "%s does not support article importing" group))
9987     (with-current-buffer (gnus-get-buffer-create " *import file*")
9988       (erase-buffer)
9989       (goto-char (point-min))
9990       ;; This doesn't look like an article, so we fudge some headers.
9991       (insert "From: " (read-string "From: ") "\n"
9992               "Subject: " (read-string "Subject: ") "\n"
9993               "Date: " (message-make-date now) "\n"
9994               "Message-ID: " (message-make-message-id) "\n")
9995       (setq group-art (gnus-request-accept-article group nil t))
9996       (kill-buffer (current-buffer)))
9997     (setq gnus-newsgroup-active (gnus-activate-group group))
9998     (forward-line 1)
9999     (gnus-summary-goto-article (cdr group-art) nil t)
10000     (gnus-summary-edit-article)))
10001
10002 (defun gnus-summary-article-posted-p ()
10003   "Say whether the current (mail) article is available from news as well.
10004 This will be the case if the article has both been mailed and posted."
10005   (interactive)
10006   (let ((id (mail-header-references (gnus-summary-article-header)))
10007         (gnus-override-method (car (gnus-refer-article-methods))))
10008     (if (gnus-request-head id "")
10009         (gnus-message 2 "The current message was found on %s"
10010                       gnus-override-method)
10011       (gnus-message 2 "The current message couldn't be found on %s"
10012                     gnus-override-method)
10013       nil)))
10014
10015 (defun gnus-summary-expire-articles (&optional now)
10016   "Expire all articles that are marked as expirable in the current group."
10017   (interactive)
10018   (when (and (not gnus-group-is-exiting-without-update-p)
10019              (gnus-check-backend-function
10020               'request-expire-articles gnus-newsgroup-name))
10021     ;; This backend supports expiry.
10022     (let* ((total (gnus-group-total-expirable-p gnus-newsgroup-name))
10023            (expirable (if total
10024                           (progn
10025                             ;; We need to update the info for
10026                             ;; this group for `gnus-list-of-read-articles'
10027                             ;; to give us the right answer.
10028                             (gnus-run-hooks 'gnus-exit-group-hook)
10029                             (gnus-summary-update-info)
10030                             (gnus-list-of-read-articles gnus-newsgroup-name))
10031                         (setq gnus-newsgroup-expirable
10032                               (sort gnus-newsgroup-expirable '<))))
10033            (expiry-wait (if now 'immediate
10034                           (gnus-group-find-parameter
10035                            gnus-newsgroup-name 'expiry-wait)))
10036            (nnmail-expiry-target
10037             (or (gnus-group-find-parameter gnus-newsgroup-name 'expiry-target)
10038                 nnmail-expiry-target))
10039            es)
10040       (when expirable
10041         ;; There are expirable articles in this group, so we run them
10042         ;; through the expiry process.
10043         (gnus-message 6 "Expiring articles...")
10044         (unless (gnus-check-group gnus-newsgroup-name)
10045           (error "Can't open server for %s" gnus-newsgroup-name))
10046         ;; The list of articles that weren't expired is returned.
10047         (save-excursion
10048           (if expiry-wait
10049               (let ((nnmail-expiry-wait-function nil)
10050                     (nnmail-expiry-wait expiry-wait))
10051                 (setq es (gnus-request-expire-articles
10052                           expirable gnus-newsgroup-name)))
10053             (setq es (gnus-request-expire-articles
10054                       expirable gnus-newsgroup-name)))
10055           (unless total
10056             (setq gnus-newsgroup-expirable es))
10057           ;; We go through the old list of expirable, and mark all
10058           ;; really expired articles as nonexistent.
10059           (unless (eq es expirable) ;If nothing was expired, we don't mark.
10060             (let ((gnus-use-cache nil))
10061               (dolist (article expirable)
10062                 (when (and (not (memq article es))
10063                            (gnus-data-find article))
10064                   (gnus-summary-mark-article article gnus-canceled-mark)
10065                   (run-hook-with-args 'gnus-summary-article-expire-hook
10066                                       'delete
10067                                       (gnus-data-header
10068                                        (assoc article (gnus-data-list nil)))
10069                                       gnus-newsgroup-name
10070                                       nil
10071                                       nil))))))
10072         (gnus-message 6 "Expiring articles...done")))))
10073
10074 (defun gnus-summary-expire-articles-now ()
10075   "Expunge all expirable articles in the current group.
10076 This means that *all* articles that are marked as expirable will be
10077 deleted forever, right now."
10078   (interactive)
10079   (or gnus-expert-user
10080       (gnus-yes-or-no-p
10081        "Are you really, really sure you want to delete all expirable messages? ")
10082       (error "Phew!"))
10083   (gnus-summary-expire-articles t))
10084
10085 ;; Suggested by Jack Vinson <vinson@unagi.cis.upenn.edu>.
10086 (defun gnus-summary-delete-article (&optional n)
10087   "Delete the N next (mail) articles.
10088 This command actually deletes articles.  This is not a marking
10089 command.  The article will disappear forever from your life, never to
10090 return.
10091
10092 If N is negative, delete backwards.
10093 If N is nil and articles have been marked with the process mark,
10094 delete these instead.
10095
10096 If `gnus-novice-user' is non-nil you will be asked for
10097 confirmation before the articles are deleted."
10098   (interactive "P")
10099   (unless (gnus-check-backend-function 'request-expire-articles
10100                                        gnus-newsgroup-name)
10101     (error "The current newsgroup does not support article deletion"))
10102   (unless (gnus-check-server (gnus-find-method-for-group gnus-newsgroup-name))
10103     (error "Couldn't open server"))
10104   ;; Compute the list of articles to delete.
10105   (let ((articles (sort (copy-sequence (gnus-summary-work-articles n)) '<))
10106         (nnmail-expiry-target 'delete)
10107         not-deleted)
10108     (if (and gnus-novice-user
10109              (not (gnus-yes-or-no-p
10110                    (format "Do you really want to delete %s forever? "
10111                            (if (> (length articles) 1)
10112                                (format "these %s articles" (length articles))
10113                              "this article")))))
10114         ()
10115       ;; Delete the articles.
10116       (setq not-deleted (gnus-request-expire-articles
10117                          articles gnus-newsgroup-name 'force))
10118       (save-excursion
10119         (while articles
10120           (gnus-summary-remove-process-mark (car articles))
10121           ;; The backend might not have been able to delete the article
10122           ;; after all.
10123           (unless (memq (car articles) not-deleted)
10124             (gnus-summary-mark-article (car articles) gnus-canceled-mark))
10125           (let* ((article (car articles))
10126                  (ghead  (gnus-data-header
10127                           (assoc article (gnus-data-list nil)))))
10128             (run-hook-with-args 'gnus-summary-article-delete-hook
10129                                 'delete ghead gnus-newsgroup-name nil
10130                                 nil))
10131           (setq articles (cdr articles))))
10132       (when not-deleted
10133         (gnus-message 4 "Couldn't delete articles %s" not-deleted)))
10134     (gnus-summary-position-point)
10135     (gnus-set-mode-line 'summary)
10136     not-deleted))
10137
10138 (defun gnus-summary-edit-article (&optional arg)
10139   "Edit the current article.
10140 This will have permanent effect only in mail groups.
10141 If ARG is nil, edit the decoded articles.
10142 If ARG is 1, edit the raw articles.
10143 If ARG is 2, edit the raw articles even in read-only groups.
10144 If ARG is 3, edit the articles with the current handles.
10145 Otherwise, allow editing of articles even in read-only
10146 groups."
10147   (interactive "P")
10148   (let (force raw current-handles)
10149     (cond
10150      ((null arg))
10151      ((eq arg 1)
10152       (setq raw t))
10153      ((eq arg 2)
10154       (setq raw t
10155             force t))
10156      ((eq arg 3)
10157       (setq current-handles
10158             (and (gnus-buffer-live-p gnus-article-buffer)
10159                  (with-current-buffer gnus-article-buffer
10160                    (prog1
10161                        gnus-article-mime-handles
10162                      (setq gnus-article-mime-handles nil))))))
10163      (t
10164       (setq force t)))
10165     (when (and raw (not force)
10166                (member gnus-newsgroup-name '("nndraft:delayed"
10167                                              "nndraft:drafts"
10168                                              "nndraft:queue")))
10169       (error "Can't edit the raw article in group %s"
10170              gnus-newsgroup-name))
10171     (with-current-buffer gnus-summary-buffer
10172       (let ((mail-parse-charset gnus-newsgroup-charset)
10173             (mail-parse-ignored-charsets gnus-newsgroup-ignored-charsets))
10174         (gnus-set-global-variables)
10175         (when (and (not force)
10176                    (gnus-group-read-only-p))
10177           (error "The current newsgroup does not support article editing"))
10178         (gnus-summary-show-article t)
10179         (when (and (not raw) (gnus-buffer-live-p gnus-article-buffer))
10180           (with-current-buffer gnus-article-buffer
10181             (mm-enable-multibyte)))
10182         (if (member gnus-newsgroup-name '("nndraft:delayed" "nndraft:drafts"))
10183             (setq raw t))
10184         (gnus-article-edit-article
10185          (if raw 'ignore
10186            `(lambda ()
10187               (let ((mbl mml-buffer-list))
10188                 (setq mml-buffer-list nil)
10189                 (let ((rfc2047-quote-decoded-words-containing-tspecials t))
10190                   (mime-to-mml ,'current-handles))
10191                 (let ((mbl1 mml-buffer-list))
10192                   (setq mml-buffer-list mbl)
10193                   (set (make-local-variable 'mml-buffer-list) mbl1))
10194                 (gnus-make-local-hook 'kill-buffer-hook)
10195                 (add-hook 'kill-buffer-hook 'mml-destroy-buffers t t))))
10196          `(lambda (no-highlight)
10197             (let ((mail-parse-charset ',gnus-newsgroup-charset)
10198                   (message-options message-options)
10199                   (message-options-set-recipient)
10200                   (mail-parse-ignored-charsets
10201                    ',gnus-newsgroup-ignored-charsets)
10202                   (rfc2047-header-encoding-alist
10203                    ',(let ((charset (gnus-group-name-charset
10204                                      (gnus-find-method-for-group
10205                                       gnus-newsgroup-name)
10206                                      gnus-newsgroup-name)))
10207                        (append (list (cons "Newsgroups" charset)
10208                                      (cons "Followup-To" charset)
10209                                      (cons "Xref" charset))
10210                                rfc2047-header-encoding-alist))))
10211               ,(if (not raw) '(progn
10212                                 (mml-to-mime)
10213                                 (mml-destroy-buffers)
10214                                 (remove-hook 'kill-buffer-hook
10215                                              'mml-destroy-buffers t)
10216                                 (kill-local-variable 'mml-buffer-list)))
10217               (gnus-summary-edit-article-done
10218                ,(or (mail-header-references gnus-current-headers) "")
10219                ,(gnus-group-read-only-p)
10220                ,gnus-summary-buffer no-highlight))))))))
10221
10222 (defalias 'gnus-summary-edit-article-postpone 'gnus-article-edit-exit)
10223
10224 (defun gnus-summary-edit-article-done (&optional references read-only buffer
10225                                                  no-highlight)
10226   "Make edits to the current article permanent."
10227   (interactive)
10228   (save-excursion
10229    ;; The buffer restriction contains the entire article if it exists.
10230     (when (article-goto-body)
10231       (let ((lines (count-lines (point) (point-max)))
10232             (length (- (point-max) (point)))
10233             (case-fold-search t)
10234             (body (copy-marker (point))))
10235         (goto-char (point-min))
10236         (when (re-search-forward "^content-length:[ \t]\\([0-9]+\\)" body t)
10237           (delete-region (match-beginning 1) (match-end 1))
10238           (insert (number-to-string length)))
10239         (goto-char (point-min))
10240         (when (re-search-forward
10241                "^x-content-length:[ \t]\\([0-9]+\\)" body t)
10242           (delete-region (match-beginning 1) (match-end 1))
10243           (insert (number-to-string length)))
10244         (goto-char (point-min))
10245         (when (re-search-forward "^lines:[ \t]\\([0-9]+\\)" body t)
10246           (delete-region (match-beginning 1) (match-end 1))
10247           (insert (number-to-string lines))))))
10248   ;; Replace the article.
10249   (let ((buf (current-buffer)))
10250     (with-temp-buffer
10251       (insert-buffer-substring buf)
10252
10253       (if (and (not read-only)
10254                (not (gnus-request-replace-article
10255                      (cdr gnus-article-current) (car gnus-article-current)
10256                      (current-buffer) t)))
10257           (error "Couldn't replace article")
10258         ;; Update the summary buffer.
10259         (if (and references
10260                  (equal (message-tokenize-header references " ")
10261                         (message-tokenize-header
10262                          (or (message-fetch-field "references") "") " ")))
10263             ;; We only have to update this line.
10264             (save-excursion
10265               (save-restriction
10266                 (message-narrow-to-head)
10267                 (let ((head (buffer-substring-no-properties
10268                              (point-min) (point-max)))
10269                       header)
10270                   (with-temp-buffer
10271                     (insert (format "211 %d Article retrieved.\n"
10272                                     (cdr gnus-article-current)))
10273                     (insert head)
10274                     (insert ".\n")
10275                     (let ((nntp-server-buffer (current-buffer)))
10276                       (setq header (car (gnus-get-newsgroup-headers
10277                                          nil t))))
10278                     (with-current-buffer gnus-summary-buffer
10279                       (gnus-data-set-header
10280                        (gnus-data-find (cdr gnus-article-current))
10281                        header)
10282                       (gnus-summary-update-article-line
10283                        (cdr gnus-article-current) header)
10284                       (if (gnus-summary-goto-subject
10285                            (cdr gnus-article-current) nil t)
10286                           (gnus-summary-update-secondary-mark
10287                            (cdr gnus-article-current))))))))
10288           ;; Update threads.
10289           (set-buffer (or buffer gnus-summary-buffer))
10290           (gnus-summary-update-article (cdr gnus-article-current))
10291           (if (gnus-summary-goto-subject (cdr gnus-article-current) nil t)
10292               (gnus-summary-update-secondary-mark
10293                (cdr gnus-article-current))))
10294         ;; Prettify the article buffer again.
10295         (unless no-highlight
10296           (with-current-buffer gnus-article-buffer
10297             ;;;!!! Fix this -- article should be rehighlighted.
10298             ;;;(gnus-run-hooks 'gnus-article-display-hook)
10299             (set-buffer gnus-original-article-buffer)
10300             (gnus-request-article
10301              (cdr gnus-article-current)
10302              (car gnus-article-current) (current-buffer))))
10303         ;; Prettify the summary buffer line.
10304         (when (gnus-visual-p 'summary-highlight 'highlight)
10305           (gnus-run-hooks 'gnus-visual-mark-article-hook))))))
10306
10307 (defun gnus-summary-edit-wash (key)
10308   "Perform editing command KEY in the article buffer."
10309   (interactive
10310    (list
10311     (progn
10312       (message "%s" (concat (this-command-keys) "- "))
10313       (read-char))))
10314   (message "")
10315   (gnus-summary-edit-article)
10316   (execute-kbd-macro (concat (this-command-keys) key))
10317   (gnus-article-edit-done))
10318
10319 ;;; Respooling
10320
10321 (defun gnus-summary-respool-query (&optional silent trace)
10322   "Query where the respool algorithm would put this article."
10323   (interactive)
10324   (let (gnus-mark-article-hook)
10325     (gnus-summary-select-article)
10326     (with-current-buffer gnus-original-article-buffer
10327       (let ((groups (nnmail-article-group 'identity trace)))
10328         (unless silent
10329           (if groups
10330               (message "This message would go to %s"
10331                        (mapconcat 'car groups ", "))
10332             (message "This message would go to no groups"))
10333           groups)))))
10334
10335 (defun gnus-summary-respool-trace ()
10336   "Trace where the respool algorithm would put this article.
10337 Display a buffer showing all fancy splitting patterns which matched."
10338   (interactive)
10339   (gnus-summary-respool-query nil t))
10340
10341 ;; Summary marking commands.
10342
10343 (defun gnus-summary-kill-same-subject-and-select (&optional unmark)
10344   "Mark articles which has the same subject as read, and then select the next.
10345 If UNMARK is positive, remove any kind of mark.
10346 If UNMARK is negative, tick articles."
10347   (interactive "P")
10348   (when unmark
10349     (setq unmark (prefix-numeric-value unmark)))
10350   (let ((count
10351          (gnus-summary-mark-same-subject
10352           (gnus-summary-article-subject) unmark)))
10353     ;; Select next unread article.  If auto-select-same mode, should
10354     ;; select the first unread article.
10355     (gnus-summary-next-article t (and gnus-auto-select-same
10356                                       (gnus-summary-article-subject)))
10357     (gnus-message 7 "%d article%s marked as %s"
10358                   count (if (= count 1) " is" "s are")
10359                   (if unmark "unread" "read"))))
10360
10361 (defun gnus-summary-kill-same-subject (&optional unmark)
10362   "Mark articles which has the same subject as read.
10363 If UNMARK is positive, remove any kind of mark.
10364 If UNMARK is negative, tick articles."
10365   (interactive "P")
10366   (when unmark
10367     (setq unmark (prefix-numeric-value unmark)))
10368   (let ((count
10369          (gnus-summary-mark-same-subject
10370           (gnus-summary-article-subject) unmark)))
10371     ;; If marked as read, go to next unread subject.
10372     (when (null unmark)
10373       ;; Go to next unread subject.
10374       (gnus-summary-next-subject 1 t))
10375     (gnus-message 7 "%d articles are marked as %s"
10376                   count (if unmark "unread" "read"))))
10377
10378 (defun gnus-summary-mark-same-subject (subject &optional unmark)
10379   "Mark articles with same SUBJECT as read, and return marked number.
10380 If optional argument UNMARK is positive, remove any kinds of marks.
10381 If optional argument UNMARK is negative, mark articles as unread instead."
10382   (let ((count 1))
10383     (save-excursion
10384       (cond
10385        ((null unmark)                   ; Mark as read.
10386         (while (and
10387                 (progn
10388                   (gnus-summary-mark-article-as-read gnus-killed-mark)
10389                   (gnus-summary-show-thread) t)
10390                 (gnus-summary-find-subject subject))
10391           (setq count (1+ count))))
10392        ((> unmark 0)                    ; Tick.
10393         (while (and
10394                 (progn
10395                   (gnus-summary-mark-article-as-unread gnus-ticked-mark)
10396                   (gnus-summary-show-thread) t)
10397                 (gnus-summary-find-subject subject))
10398           (setq count (1+ count))))
10399        (t                               ; Mark as unread.
10400         (while (and
10401                 (progn
10402                   (gnus-summary-mark-article-as-unread gnus-unread-mark)
10403                   (gnus-summary-show-thread) t)
10404                 (gnus-summary-find-subject subject))
10405           (setq count (1+ count)))))
10406       (gnus-set-mode-line 'summary)
10407       ;; Return the number of marked articles.
10408       count)))
10409
10410 (defun gnus-summary-mark-as-processable (n &optional unmark)
10411   "Set the process mark on the next N articles.
10412 If N is negative, mark backward instead.  If UNMARK is non-nil, remove
10413 the process mark instead.  The difference between N and the actual
10414 number of articles marked is returned."
10415   (interactive "P")
10416   (if (and (null n) (gnus-region-active-p))
10417       (gnus-uu-mark-region (region-beginning) (region-end) unmark)
10418     (setq n (prefix-numeric-value n))
10419     (let ((backward (< n 0))
10420           (n (abs n)))
10421       (while (and
10422               (> n 0)
10423               (if unmark
10424                   (gnus-summary-remove-process-mark
10425                    (gnus-summary-article-number))
10426                 (gnus-summary-set-process-mark (gnus-summary-article-number)))
10427               (zerop (gnus-summary-next-subject (if backward -1 1) nil t)))
10428         (setq n (1- n)))
10429       (when (/= 0 n)
10430         (gnus-message 7 "No more articles"))
10431       (gnus-summary-recenter)
10432       (gnus-summary-position-point)
10433       n)))
10434
10435 (defun gnus-summary-unmark-as-processable (n)
10436   "Remove the process mark from the next N articles.
10437 If N is negative, unmark backward instead.  The difference between N and
10438 the actual number of articles unmarked is returned."
10439   (interactive "P")
10440   (gnus-summary-mark-as-processable n t))
10441
10442 (defun gnus-summary-unmark-all-processable ()
10443   "Remove the process mark from all articles."
10444   (interactive)
10445   (save-excursion
10446     (while gnus-newsgroup-processable
10447       (gnus-summary-remove-process-mark (car gnus-newsgroup-processable))))
10448   (gnus-summary-position-point))
10449
10450 (defun gnus-summary-add-mark (article type)
10451   "Mark ARTICLE with a mark of TYPE."
10452   (let ((vtype (car (assq type gnus-article-mark-lists)))
10453         var)
10454     (if (not vtype)
10455         (error "No such mark type: %s" type)
10456       (setq var (intern (format "gnus-newsgroup-%s" type)))
10457       (set var (cons article (symbol-value var)))
10458       (if (memq type '(processable cached replied forwarded recent saved))
10459           (gnus-summary-update-secondary-mark article)
10460         ;;; !!! This is bogus.  We should find out what primary
10461         ;;; !!! mark we want to set.
10462         (gnus-summary-update-mark gnus-del-mark 'unread)))))
10463
10464 (defun gnus-summary-mark-as-expirable (n)
10465   "Mark N articles forward as expirable.
10466 If N is negative, mark backward instead.  The difference between N and
10467 the actual number of articles marked is returned."
10468   (interactive "p")
10469   (gnus-summary-mark-forward n gnus-expirable-mark))
10470
10471 (defun gnus-summary-mark-as-spam (n)
10472   "Mark N articles forward as spam.
10473 If N is negative, mark backward instead.  The difference between N and
10474 the actual number of articles marked is returned."
10475   (interactive "p")
10476   (gnus-summary-mark-forward n gnus-spam-mark))
10477
10478 (defun gnus-summary-mark-article-as-replied (article)
10479   "Mark ARTICLE as replied to and update the summary line.
10480 ARTICLE can also be a list of articles."
10481   (interactive (list (gnus-summary-article-number)))
10482   (let ((articles (if (listp article) article (list article))))
10483     (dolist (article articles)
10484       (unless (numberp article)
10485         (error "%s is not a number" article))
10486       (push article gnus-newsgroup-replied)
10487       (let ((inhibit-read-only t))
10488         (when (gnus-summary-goto-subject article nil t)
10489           (gnus-summary-update-secondary-mark article))))))
10490
10491 (defun gnus-summary-mark-article-as-forwarded (article)
10492   "Mark ARTICLE as forwarded and update the summary line.
10493 ARTICLE can also be a list of articles."
10494   (let ((articles (if (listp article) article (list article))))
10495     (dolist (article articles)
10496       (push article gnus-newsgroup-forwarded)
10497       (let ((inhibit-read-only t))
10498         (when (gnus-summary-goto-subject article nil t)
10499           (gnus-summary-update-secondary-mark article))))))
10500
10501 (defun gnus-summary-set-bookmark (article)
10502   "Set a bookmark in current article."
10503   (interactive (list (gnus-summary-article-number)))
10504   (when (or (not (get-buffer gnus-article-buffer))
10505             (not gnus-current-article)
10506             (not gnus-article-current)
10507             (not (equal gnus-newsgroup-name (car gnus-article-current))))
10508     (error "No current article selected"))
10509   ;; Remove old bookmark, if one exists.
10510   (gnus-pull article gnus-newsgroup-bookmarks)
10511   ;; Set the new bookmark, which is on the form
10512   ;; (article-number . line-number-in-body).
10513   (push
10514    (cons article
10515          (with-current-buffer gnus-article-buffer
10516            (count-lines
10517             (min (point)
10518                  (save-excursion
10519                    (article-goto-body)
10520                    (point)))
10521             (point))))
10522    gnus-newsgroup-bookmarks)
10523   (gnus-message 6 "A bookmark has been added to the current article."))
10524
10525 (defun gnus-summary-remove-bookmark (article)
10526   "Remove the bookmark from the current article."
10527   (interactive (list (gnus-summary-article-number)))
10528   ;; Remove old bookmark, if one exists.
10529   (if (not (assq article gnus-newsgroup-bookmarks))
10530       (gnus-message 6 "No bookmark in current article.")
10531     (gnus-pull article gnus-newsgroup-bookmarks)
10532     (gnus-message 6 "Removed bookmark.")))
10533
10534 ;; Suggested by Daniel Quinlan <quinlan@best.com>.
10535 (defun gnus-summary-mark-as-dormant (n)
10536   "Mark N articles forward as dormant.
10537 If N is negative, mark backward instead.  The difference between N and
10538 the actual number of articles marked is returned."
10539   (interactive "p")
10540   (gnus-summary-mark-forward n gnus-dormant-mark))
10541
10542 (defun gnus-summary-set-process-mark (article)
10543   "Set the process mark on ARTICLE and update the summary line."
10544   (setq gnus-newsgroup-processable
10545         (cons article
10546               (delq article gnus-newsgroup-processable)))
10547   (when (gnus-summary-goto-subject article)
10548     (gnus-summary-show-thread)
10549     (gnus-summary-goto-subject article)
10550     (gnus-summary-update-secondary-mark article)))
10551
10552 (defun gnus-summary-remove-process-mark (&rest articles)
10553   "Remove the process mark from ARTICLES and update the summary line."
10554   (dolist (article articles)
10555     (setq gnus-newsgroup-processable (delq article gnus-newsgroup-processable))
10556     (when (gnus-summary-goto-subject article)
10557       (gnus-summary-show-thread)
10558       (gnus-summary-goto-subject article)
10559       (gnus-summary-update-secondary-mark article)))
10560   t)
10561
10562 (defun gnus-summary-set-saved-mark (article)
10563   "Set the process mark on ARTICLE and update the summary line."
10564   (push article gnus-newsgroup-saved)
10565   (when (gnus-summary-goto-subject article)
10566     (gnus-summary-update-secondary-mark article)))
10567
10568 (defun gnus-summary-mark-forward (n &optional mark no-expire)
10569   "Mark N articles as read forwards.
10570 If N is negative, mark backwards instead.  Mark with MARK, ?r by default.
10571 The difference between N and the actual number of articles marked is
10572 returned.
10573 If NO-EXPIRE, auto-expiry will be inhibited."
10574   (interactive "p")
10575   (gnus-summary-show-thread)
10576   (let ((backward (< n 0))
10577         (gnus-summary-goto-unread
10578          (and gnus-summary-goto-unread
10579               (not (eq gnus-summary-goto-unread 'never))
10580               (not (memq mark (list gnus-unread-mark gnus-spam-mark
10581                                     gnus-ticked-mark gnus-dormant-mark)))))
10582         (n (abs n))
10583         (mark (or mark gnus-del-mark)))
10584     (while (and (> n 0)
10585                 (gnus-summary-mark-article nil mark no-expire)
10586                 (zerop (gnus-summary-next-subject
10587                         (if backward -1 1)
10588                         (and gnus-summary-goto-unread
10589                              (not (eq gnus-summary-goto-unread 'never)))
10590                         t)))
10591       (setq n (1- n)))
10592     (when (/= 0 n)
10593       (gnus-message 7 "No more %sarticles" (if mark "" "unread ")))
10594     (gnus-summary-recenter)
10595     (gnus-summary-position-point)
10596     (gnus-set-mode-line 'summary)
10597     n))
10598
10599 (defun gnus-summary-mark-article-as-read (mark)
10600   "Mark the current article quickly as read with MARK."
10601   (let ((article (gnus-summary-article-number)))
10602     (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
10603     (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
10604     (setq gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked))
10605     (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
10606     (push (cons article mark) gnus-newsgroup-reads)
10607     ;; Possibly remove from cache, if that is used.
10608     (when gnus-use-cache
10609       (gnus-cache-enter-remove-article article))
10610     ;; Allow the backend to change the mark.
10611     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
10612     ;; Check for auto-expiry.
10613     (when (and gnus-newsgroup-auto-expire
10614                (memq mark gnus-auto-expirable-marks))
10615       (setq mark gnus-expirable-mark)
10616       ;; Let the backend know about the mark change.
10617       (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
10618       (push article gnus-newsgroup-expirable))
10619     ;; Set the mark in the buffer.
10620     (gnus-summary-update-mark mark 'unread)
10621     t))
10622
10623 (defun gnus-summary-mark-article-as-unread (mark)
10624   "Mark the current article quickly as unread with MARK."
10625   (let* ((article (gnus-summary-article-number))
10626          (old-mark (gnus-summary-article-mark article)))
10627     ;; Allow the backend to change the mark.
10628     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
10629     (if (eq mark old-mark)
10630         t
10631       (if (<= article 0)
10632           (progn
10633             (gnus-error 1 "Can't mark negative article numbers")
10634             nil)
10635         (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
10636         (setq gnus-newsgroup-spam-marked
10637               (delq article gnus-newsgroup-spam-marked))
10638         (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
10639         (setq gnus-newsgroup-expirable (delq article gnus-newsgroup-expirable))
10640         (setq gnus-newsgroup-reads (delq article gnus-newsgroup-reads))
10641         (cond ((= mark gnus-ticked-mark)
10642                (setq gnus-newsgroup-marked
10643                      (gnus-add-to-sorted-list gnus-newsgroup-marked
10644                                               article)))
10645               ((= mark gnus-spam-mark)
10646                (setq gnus-newsgroup-spam-marked
10647                      (gnus-add-to-sorted-list gnus-newsgroup-spam-marked
10648                                               article)))
10649               ((= mark gnus-dormant-mark)
10650                (setq gnus-newsgroup-dormant
10651                      (gnus-add-to-sorted-list gnus-newsgroup-dormant
10652                                               article)))
10653               (t
10654                (setq gnus-newsgroup-unreads
10655                      (gnus-add-to-sorted-list gnus-newsgroup-unreads
10656                                               article))))
10657         (gnus-pull article gnus-newsgroup-reads)
10658
10659         ;; See whether the article is to be put in the cache.
10660         (and gnus-use-cache
10661              (vectorp (gnus-summary-article-header article))
10662              (save-excursion
10663                (gnus-cache-possibly-enter-article
10664                 gnus-newsgroup-name article
10665                 (= mark gnus-ticked-mark)
10666                 (= mark gnus-dormant-mark) (= mark gnus-unread-mark))))
10667
10668         ;; Fix the mark.
10669         (gnus-summary-update-mark mark 'unread)
10670         t))))
10671
10672 (defun gnus-summary-mark-article (&optional article mark no-expire)
10673   "Mark ARTICLE with MARK.  MARK can be any character.
10674 Four MARK strings are reserved: `? ' (unread), `?!' (ticked),
10675 `??' (dormant) and `?E' (expirable).
10676 If MARK is nil, then the default character `?r' is used.
10677 If ARTICLE is nil, then the article on the current line will be
10678 marked.
10679 If NO-EXPIRE, auto-expiry will be inhibited."
10680   ;; The mark might be a string.
10681   (when (stringp mark)
10682     (setq mark (aref mark 0)))
10683   ;; If no mark is given, then we check auto-expiring.
10684   (when (null mark)
10685     (setq mark gnus-del-mark))
10686   (when (and (not no-expire)
10687              gnus-newsgroup-auto-expire
10688              (memq mark gnus-auto-expirable-marks))
10689     (setq mark gnus-expirable-mark))
10690   (let ((article (or article (gnus-summary-article-number)))
10691         (old-mark (gnus-summary-article-mark article)))
10692     ;; Allow the backend to change the mark.
10693     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
10694     (if (eq mark old-mark)
10695         t
10696       (unless article
10697         (error "No article on current line"))
10698       (if (not (if (or (= mark gnus-unread-mark)
10699                        (= mark gnus-ticked-mark)
10700                        (= mark gnus-spam-mark)
10701                        (= mark gnus-dormant-mark))
10702                    (gnus-mark-article-as-unread article mark)
10703                  (gnus-mark-article-as-read article mark)))
10704           t
10705         ;; See whether the article is to be put in the cache.
10706         (and gnus-use-cache
10707              (not (= mark gnus-canceled-mark))
10708              (vectorp (gnus-summary-article-header article))
10709              (save-excursion
10710                (gnus-cache-possibly-enter-article
10711                 gnus-newsgroup-name article
10712                 (= mark gnus-ticked-mark)
10713                 (= mark gnus-dormant-mark) (= mark gnus-unread-mark))))
10714
10715         (when (gnus-summary-goto-subject article nil t)
10716           (let ((inhibit-read-only t))
10717             (gnus-summary-show-thread)
10718             ;; Fix the mark.
10719             (gnus-summary-update-mark mark 'unread)
10720             t))))))
10721
10722 (defun gnus-summary-update-secondary-mark (article)
10723   "Update the secondary (read, process, cache) mark."
10724   (gnus-summary-update-mark
10725    (cond ((memq article gnus-newsgroup-processable)
10726           gnus-process-mark)
10727          ((memq article gnus-newsgroup-cached)
10728           gnus-cached-mark)
10729          ((memq article gnus-newsgroup-replied)
10730           gnus-replied-mark)
10731          ((memq article gnus-newsgroup-forwarded)
10732           gnus-forwarded-mark)
10733          ((memq article gnus-newsgroup-saved)
10734           gnus-saved-mark)
10735          ((memq article gnus-newsgroup-recent)
10736           gnus-recent-mark)
10737          ((memq article gnus-newsgroup-unseen)
10738           gnus-unseen-mark)
10739          (t gnus-no-mark))
10740    'replied)
10741   (when (gnus-visual-p 'summary-highlight 'highlight)
10742     (gnus-run-hooks 'gnus-summary-update-hook))
10743   t)
10744
10745 (defun gnus-summary-update-download-mark (article)
10746   "Update the download mark."
10747   (gnus-summary-update-mark
10748    (cond ((memq article gnus-newsgroup-undownloaded)
10749           gnus-undownloaded-mark)
10750          (gnus-newsgroup-agentized
10751           gnus-downloaded-mark)
10752          (t
10753           gnus-no-mark))
10754    'download)
10755   (gnus-summary-update-line t)
10756   t)
10757
10758 (defun gnus-summary-update-mark (mark type)
10759   (let ((forward (cdr (assq type gnus-summary-mark-positions)))
10760         (inhibit-read-only t))
10761     (re-search-backward "[\n\r]" (point-at-bol) 'move-to-limit)
10762     (when forward
10763       (when (looking-at "\r")
10764         (incf forward))
10765       (when (<= (+ forward (point)) (point-max))
10766         ;; Go to the right position on the line.
10767         (goto-char (+ forward (point)))
10768         ;; Replace the old mark with the new mark.
10769         (subst-char-in-region (point) (1+ (point)) (char-after) mark)
10770         ;; Optionally update the marks by some user rule.
10771         (when (eq type 'unread)
10772           (gnus-data-set-mark
10773            (gnus-data-find (gnus-summary-article-number)) mark)
10774           (gnus-summary-update-line (eq mark gnus-unread-mark)))))))
10775
10776 (defun gnus-mark-article-as-read (article &optional mark)
10777   "Enter ARTICLE in the pertinent lists and remove it from others."
10778   ;; Make the article expirable.
10779   (let ((mark (or mark gnus-del-mark)))
10780     (setq gnus-newsgroup-expirable
10781           (if (= mark gnus-expirable-mark)
10782               (gnus-add-to-sorted-list gnus-newsgroup-expirable article)
10783             (delq article gnus-newsgroup-expirable)))
10784     ;; Remove from unread and marked lists.
10785     (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
10786     (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
10787     (setq gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked))
10788     (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
10789     (push (cons article mark) gnus-newsgroup-reads)
10790     ;; Possibly remove from cache, if that is used.
10791     (when gnus-use-cache
10792       (gnus-cache-enter-remove-article article))
10793     t))
10794
10795 (defun gnus-mark-article-as-unread (article &optional mark)
10796   "Enter ARTICLE in the pertinent lists and remove it from others."
10797   (let ((mark (or mark gnus-ticked-mark)))
10798     (if (<= article 0)
10799         (progn
10800           (gnus-error 1 "Can't mark negative article numbers")
10801           nil)
10802       (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked)
10803             gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked)
10804             gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant)
10805             gnus-newsgroup-expirable (delq article gnus-newsgroup-expirable)
10806             gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
10807
10808       ;; Unsuppress duplicates?
10809       (when gnus-suppress-duplicates
10810         (gnus-dup-unsuppress-article article))
10811
10812       (cond ((= mark gnus-ticked-mark)
10813              (setq gnus-newsgroup-marked
10814                    (gnus-add-to-sorted-list gnus-newsgroup-marked article)))
10815             ((= mark gnus-spam-mark)
10816              (setq gnus-newsgroup-spam-marked
10817                    (gnus-add-to-sorted-list gnus-newsgroup-spam-marked
10818                                             article)))
10819             ((= mark gnus-dormant-mark)
10820              (setq gnus-newsgroup-dormant
10821                    (gnus-add-to-sorted-list gnus-newsgroup-dormant article)))
10822             (t
10823              (setq gnus-newsgroup-unreads
10824                    (gnus-add-to-sorted-list gnus-newsgroup-unreads article))))
10825       (gnus-pull article gnus-newsgroup-reads)
10826       t)))
10827
10828 (defalias 'gnus-summary-mark-as-unread-forward
10829   'gnus-summary-tick-article-forward)
10830 (make-obsolete 'gnus-summary-mark-as-unread-forward
10831                'gnus-summary-tick-article-forward "Emacs 20.4")
10832 (defun gnus-summary-tick-article-forward (n)
10833   "Tick N articles forwards.
10834 If N is negative, tick backwards instead.
10835 The difference between N and the number of articles ticked is returned."
10836   (interactive "p")
10837   (gnus-summary-mark-forward n gnus-ticked-mark))
10838
10839 (defalias 'gnus-summary-mark-as-unread-backward
10840   'gnus-summary-tick-article-backward)
10841 (make-obsolete 'gnus-summary-mark-as-unread-backward
10842                'gnus-summary-tick-article-backward "Emacs 20.4")
10843 (defun gnus-summary-tick-article-backward (n)
10844   "Tick N articles backwards.
10845 The difference between N and the number of articles ticked is returned."
10846   (interactive "p")
10847   (gnus-summary-mark-forward (- n) gnus-ticked-mark))
10848
10849 (defalias 'gnus-summary-mark-as-unread 'gnus-summary-tick-article)
10850 (make-obsolete 'gnus-summary-mark-as-unread 'gnus-summary-tick-article "Emacs 20.4")
10851 (defun gnus-summary-tick-article (&optional article clear-mark)
10852   "Mark current article as unread.
10853 Optional 1st argument ARTICLE specifies article number to be marked as unread.
10854 Optional 2nd argument CLEAR-MARK remove any kinds of mark."
10855   (interactive)
10856   (gnus-summary-mark-article article (if clear-mark gnus-unread-mark
10857                                        gnus-ticked-mark)))
10858
10859 (defun gnus-summary-mark-as-read-forward (n)
10860   "Mark N articles as read forwards.
10861 If N is negative, mark backwards instead.
10862 The difference between N and the actual number of articles marked is
10863 returned."
10864   (interactive "p")
10865   (gnus-summary-mark-forward n gnus-del-mark gnus-inhibit-user-auto-expire))
10866
10867 (defun gnus-summary-mark-as-read-backward (n)
10868   "Mark the N articles as read backwards.
10869 The difference between N and the actual number of articles marked is
10870 returned."
10871   (interactive "p")
10872   (gnus-summary-mark-forward
10873    (- n) gnus-del-mark gnus-inhibit-user-auto-expire))
10874
10875 (defun gnus-summary-mark-as-read (&optional article mark)
10876   "Mark current article as read.
10877 ARTICLE specifies the article to be marked as read.
10878 MARK specifies a string to be inserted at the beginning of the line."
10879   (gnus-summary-mark-article article mark))
10880
10881 (defun gnus-summary-clear-mark-forward (n)
10882   "Clear marks from N articles forward.
10883 If N is negative, clear backward instead.
10884 The difference between N and the number of marks cleared is returned."
10885   (interactive "p")
10886   (gnus-summary-mark-forward n gnus-unread-mark))
10887
10888 (defun gnus-summary-clear-mark-backward (n)
10889   "Clear marks from N articles backward.
10890 The difference between N and the number of marks cleared is returned."
10891   (interactive "p")
10892   (gnus-summary-mark-forward (- n) gnus-unread-mark))
10893
10894 (defun gnus-summary-mark-unread-as-read ()
10895   "Intended to be used by `gnus-mark-article-hook'."
10896   (when (memq gnus-current-article gnus-newsgroup-unreads)
10897     (gnus-summary-mark-article gnus-current-article gnus-read-mark)))
10898
10899 (defun gnus-summary-mark-read-and-unread-as-read (&optional new-mark)
10900   "Intended to be used by `gnus-mark-article-hook'."
10901   (let ((mark (gnus-summary-article-mark)))
10902     (when (or (gnus-unread-mark-p mark)
10903               (gnus-read-mark-p mark))
10904       (gnus-summary-mark-article gnus-current-article
10905                                  (or new-mark gnus-read-mark)))))
10906
10907 (defun gnus-summary-mark-current-read-and-unread-as-read (&optional new-mark)
10908   "Intended to be used by `gnus-mark-article-hook'."
10909   (let ((mark (gnus-summary-article-mark)))
10910     (when (or (gnus-unread-mark-p mark)
10911               (gnus-read-mark-p mark))
10912       (gnus-summary-mark-article (gnus-summary-article-number)
10913                                  (or new-mark gnus-read-mark)))))
10914
10915 (defun gnus-summary-mark-unread-as-ticked ()
10916   "Intended to be used by `gnus-mark-article-hook'."
10917   (when (memq gnus-current-article gnus-newsgroup-unreads)
10918     (gnus-summary-mark-article gnus-current-article gnus-ticked-mark)))
10919
10920 (defun gnus-summary-mark-region-as-read (point mark all)
10921   "Mark all unread articles between point and mark as read.
10922 If given a prefix, mark all articles between point and mark as read,
10923 even ticked and dormant ones."
10924   (interactive "r\nP")
10925   (save-excursion
10926     (let (article)
10927       (goto-char point)
10928       (beginning-of-line)
10929       (while (and
10930               (< (point) mark)
10931               (progn
10932                 (when (or all
10933                           (memq (setq article (gnus-summary-article-number))
10934                                 gnus-newsgroup-unreads))
10935                   (gnus-summary-mark-article article gnus-del-mark))
10936                 t)
10937               (gnus-summary-find-next))))))
10938
10939 (defun gnus-summary-mark-below (score mark)
10940   "Mark articles with score less than SCORE with MARK."
10941   (interactive "P\ncMark: ")
10942   (setq score (if score
10943                   (prefix-numeric-value score)
10944                 (or gnus-summary-default-score 0)))
10945   (with-current-buffer gnus-summary-buffer
10946     (goto-char (point-min))
10947     (while
10948         (progn
10949           (and (< (gnus-summary-article-score) score)
10950                (gnus-summary-mark-article nil mark))
10951           (gnus-summary-find-next)))))
10952
10953 (defun gnus-summary-kill-below (&optional score)
10954   "Mark articles with score below SCORE as read."
10955   (interactive "P")
10956   (gnus-summary-mark-below score gnus-killed-mark))
10957
10958 (defun gnus-summary-clear-above (&optional score)
10959   "Clear all marks from articles with score above SCORE."
10960   (interactive "P")
10961   (gnus-summary-mark-above score gnus-unread-mark))
10962
10963 (defun gnus-summary-tick-above (&optional score)
10964   "Tick all articles with score above SCORE."
10965   (interactive "P")
10966   (gnus-summary-mark-above score gnus-ticked-mark))
10967
10968 (defun gnus-summary-mark-above (score mark)
10969   "Mark articles with score over SCORE with MARK."
10970   (interactive "P\ncMark: ")
10971   (setq score (if score
10972                   (prefix-numeric-value score)
10973                 (or gnus-summary-default-score 0)))
10974   (with-current-buffer gnus-summary-buffer
10975     (goto-char (point-min))
10976     (while (and (progn
10977                   (when (> (gnus-summary-article-score) score)
10978                     (gnus-summary-mark-article nil mark))
10979                   t)
10980                 (gnus-summary-find-next)))))
10981
10982 ;; Suggested by Daniel Quinlan <quinlan@best.com>.
10983 (defalias 'gnus-summary-show-all-expunged 'gnus-summary-limit-include-expunged)
10984 (defun gnus-summary-limit-include-expunged (&optional no-error)
10985   "Display all the hidden articles that were expunged for low scores."
10986   (interactive)
10987   (let ((inhibit-read-only t))
10988     (let ((scored gnus-newsgroup-scored)
10989           headers h)
10990       (while scored
10991         (unless (gnus-summary-article-header (caar scored))
10992           (and (setq h (gnus-number-to-header (caar scored)))
10993                (< (cdar scored) gnus-summary-expunge-below)
10994                (push h headers)))
10995         (setq scored (cdr scored)))
10996       (if (not headers)
10997           (when (not no-error)
10998             (error "No expunged articles hidden"))
10999         (goto-char (point-min))
11000         (push gnus-newsgroup-limit gnus-newsgroup-limits)
11001         (setq gnus-newsgroup-limit (copy-sequence gnus-newsgroup-limit))
11002         (dolist (x headers)
11003           (push (mail-header-number x) gnus-newsgroup-limit))
11004         (gnus-summary-prepare-unthreaded (nreverse headers))
11005         (goto-char (point-min))
11006         (gnus-summary-position-point)
11007         t))))
11008
11009 (defun gnus-summary-catchup (&optional all quietly to-here not-mark reverse)
11010   "Mark all unread articles in this newsgroup as read.
11011 If prefix argument ALL is non-nil, ticked and dormant articles will
11012 also be marked as read.
11013 If QUIETLY is non-nil, no questions will be asked.
11014
11015 If TO-HERE is non-nil, it should be a point in the buffer.  All
11016 articles before (after, if REVERSE is set) this point will be marked
11017 as read.
11018
11019 Note that this function will only catch up the unread article
11020 in the current summary buffer limitation.
11021
11022 The number of articles marked as read is returned."
11023   (interactive "P")
11024   (prog1
11025       (save-excursion
11026         (when (or quietly
11027                   (not gnus-interactive-catchup) ;Without confirmation?
11028                   gnus-expert-user
11029                   (gnus-y-or-n-p
11030                    (if all
11031                        "Mark absolutely all articles as read? "
11032                      "Mark all unread articles as read? ")))
11033           (if (and not-mark
11034                    (not gnus-newsgroup-adaptive)
11035                    (not gnus-newsgroup-auto-expire)
11036                    (not gnus-suppress-duplicates)
11037                    (or (not gnus-use-cache)
11038                        (eq gnus-use-cache 'passive)))
11039               (progn
11040                 (when all
11041                   (setq gnus-newsgroup-marked nil
11042                         gnus-newsgroup-spam-marked nil
11043                         gnus-newsgroup-dormant nil))
11044                 (setq gnus-newsgroup-unreads
11045                       (gnus-sorted-nunion
11046                        (gnus-sorted-intersection gnus-newsgroup-unreads
11047                                                  gnus-newsgroup-downloadable)
11048                        (gnus-sorted-difference gnus-newsgroup-unfetched
11049                                                gnus-newsgroup-cached))))
11050             ;; We actually mark all articles as canceled, which we
11051             ;; have to do when using auto-expiry or adaptive scoring.
11052             (gnus-summary-show-all-threads)
11053             (if (and to-here reverse)
11054                 (progn
11055                   (goto-char to-here)
11056                   (gnus-summary-mark-current-read-and-unread-as-read
11057                    gnus-catchup-mark)
11058                   (while (gnus-summary-find-next (not all))
11059                     (gnus-summary-mark-article-as-read gnus-catchup-mark)))
11060               (when (gnus-summary-first-subject (not all))
11061                 (while (and
11062                         (if to-here (< (point) to-here) t)
11063                         (gnus-summary-mark-article-as-read gnus-catchup-mark)
11064                         (gnus-summary-find-next (not all))))))
11065             (gnus-set-mode-line 'summary))
11066           t))
11067     (gnus-summary-position-point)))
11068
11069 (defun gnus-summary-catchup-to-here (&optional all)
11070   "Mark all unticked articles before the current one as read.
11071 If ALL is non-nil, also mark ticked and dormant articles as read."
11072   (interactive "P")
11073   (save-excursion
11074     (gnus-save-hidden-threads
11075       (let ((beg (point)))
11076         ;; We check that there are unread articles.
11077         (when (or all (gnus-summary-find-prev))
11078           (gnus-summary-catchup all t beg)))))
11079   (gnus-summary-position-point))
11080
11081 (defun gnus-summary-catchup-from-here (&optional all)
11082   "Mark all unticked articles after (and including) the current one as read.
11083 If ALL is non-nil, also mark ticked and dormant articles as read."
11084   (interactive "P")
11085   (save-excursion
11086     (gnus-save-hidden-threads
11087       (let ((beg (point)))
11088         ;; We check that there are unread articles.
11089         (when (or all (gnus-summary-find-next))
11090           (gnus-summary-catchup all t beg nil t)))))
11091   (gnus-summary-position-point))
11092
11093 (defun gnus-summary-catchup-all (&optional quietly)
11094   "Mark all articles in this newsgroup as read.
11095 This command is dangerous.  Normally, you want \\[gnus-summary-catchup]
11096 instead, which marks only unread articles as read."
11097   (interactive "P")
11098   (gnus-summary-catchup t quietly))
11099
11100 (defun gnus-summary-catchup-and-exit (&optional all quietly)
11101   "Mark all unread articles in this group as read, then exit.
11102 If prefix argument ALL is non-nil, all articles are marked as read.
11103 If QUIETLY is non-nil, no questions will be asked."
11104   (interactive "P")
11105   (when (gnus-summary-catchup all quietly nil 'fast)
11106     ;; Select next newsgroup or exit.
11107     (if (and (not (gnus-group-quit-config gnus-newsgroup-name))
11108              (eq gnus-auto-select-next 'quietly))
11109         (gnus-summary-next-group nil)
11110       (gnus-summary-exit))))
11111
11112 (defun gnus-summary-catchup-all-and-exit (&optional quietly)
11113   "Mark all articles in this newsgroup as read, and then exit.
11114 This command is dangerous.  Normally, you want \\[gnus-summary-catchup-and-exit]
11115 instead, which marks only unread articles as read."
11116   (interactive "P")
11117   (gnus-summary-catchup-and-exit t quietly))
11118
11119 (defun gnus-summary-catchup-and-goto-next-group (&optional all)
11120   "Mark all articles in this group as read and select the next group.
11121 If given a prefix, mark all articles, unread as well as ticked, as
11122 read."
11123   (interactive "P")
11124   (save-excursion
11125     (gnus-summary-catchup all))
11126   (gnus-summary-next-group))
11127
11128 (defun gnus-summary-catchup-and-goto-prev-group (&optional all)
11129   "Mark all articles in this group as read and select the previous group.
11130 If given a prefix, mark all articles, unread as well as ticked, as
11131 read."
11132   (interactive "P")
11133   (save-excursion
11134     (gnus-summary-catchup all))
11135   (gnus-summary-next-group nil nil t))
11136
11137 ;;;
11138 ;;; with article
11139 ;;;
11140
11141 (defmacro gnus-with-article (article &rest forms)
11142   "Select ARTICLE and perform FORMS in the original article buffer.
11143 Then replace the article with the result."
11144   `(progn
11145      ;; We don't want the article to be marked as read.
11146      (let (gnus-mark-article-hook)
11147        (gnus-summary-select-article t t nil ,article))
11148      (set-buffer gnus-original-article-buffer)
11149      ,@forms
11150      (if (not (gnus-check-backend-function
11151                'request-replace-article (car gnus-article-current)))
11152          (gnus-message 5 "Read-only group; not replacing")
11153        (unless (gnus-request-replace-article
11154                 ,article (car gnus-article-current)
11155                 (current-buffer) t)
11156          (error "Couldn't replace article")))
11157      ;; The cache and backlog have to be flushed somewhat.
11158      (when gnus-keep-backlog
11159        (gnus-backlog-remove-article
11160         (car gnus-article-current) (cdr gnus-article-current)))
11161      (when gnus-use-cache
11162        (gnus-cache-update-article
11163         (car gnus-article-current) (cdr gnus-article-current)))))
11164
11165 (put 'gnus-with-article 'lisp-indent-function 1)
11166 (put 'gnus-with-article 'edebug-form-spec '(form body))
11167
11168 ;; Thread-based commands.
11169
11170 (defun gnus-summary-articles-in-thread (&optional article)
11171   "Return a list of all articles in the current thread.
11172 If ARTICLE is non-nil, return all articles in the thread that starts
11173 with that article."
11174   (let* ((article (or article (gnus-summary-article-number)))
11175          (data (gnus-data-find-list article))
11176          (top-level (gnus-data-level (car data)))
11177          (top-subject
11178           (cond ((null gnus-thread-operation-ignore-subject)
11179                  (gnus-simplify-subject-re
11180                   (mail-header-subject (gnus-data-header (car data)))))
11181                 ((eq gnus-thread-operation-ignore-subject 'fuzzy)
11182                  (gnus-simplify-subject-fuzzy
11183                   (mail-header-subject (gnus-data-header (car data)))))
11184                 (t nil)))
11185          (end-point (save-excursion
11186                       (if (gnus-summary-go-to-next-thread)
11187                           (point) (point-max))))
11188          articles)
11189     (while (and data
11190                 (< (gnus-data-pos (car data)) end-point))
11191       (when (or (not top-subject)
11192                 (string= top-subject
11193                          (if (eq gnus-thread-operation-ignore-subject 'fuzzy)
11194                              (gnus-simplify-subject-fuzzy
11195                               (mail-header-subject
11196                                (gnus-data-header (car data))))
11197                            (gnus-simplify-subject-re
11198                             (mail-header-subject
11199                              (gnus-data-header (car data)))))))
11200         (push (gnus-data-number (car data)) articles))
11201       (unless (and (setq data (cdr data))
11202                    (> (gnus-data-level (car data)) top-level))
11203         (setq data nil)))
11204     ;; Return the list of articles.
11205     (nreverse articles)))
11206
11207 (defun gnus-summary-rethread-current ()
11208   "Rethread the thread the current article is part of."
11209   (interactive)
11210   (let* ((gnus-show-threads t)
11211          (article (gnus-summary-article-number))
11212          (id (mail-header-id (gnus-summary-article-header)))
11213          (gnus-newsgroup-threads (list (gnus-id-to-thread (gnus-root-id id)))))
11214     (unless id
11215       (error "No article on the current line"))
11216     (gnus-rebuild-thread id)
11217     (gnus-summary-goto-subject article)))
11218
11219 (defun gnus-summary-reparent-thread ()
11220   "Make the current article child of the marked (or previous) article.
11221
11222 Note that the re-threading will only work if `gnus-thread-ignore-subject'
11223 is non-nil or the Subject: of both articles are the same."
11224   (interactive)
11225   (unless (not (gnus-group-read-only-p))
11226     (error "The current newsgroup does not support article editing"))
11227   (unless (<= (length gnus-newsgroup-processable) 1)
11228     (error "No more than one article may be marked"))
11229   (let ((child (gnus-summary-article-number))
11230         ;; First grab the marked article, otherwise one line up.
11231         (parent (if (not (null gnus-newsgroup-processable))
11232                     (car gnus-newsgroup-processable)
11233                   (save-excursion
11234                     (if (eq (forward-line -1) 0)
11235                         (gnus-summary-article-number)
11236                       (error "Beginning of summary buffer"))))))
11237     (gnus-summary-reparent-children parent (list child))))
11238
11239 (defun gnus-summary-reparent-children (parent children)
11240   "Make PARENT the parent of CHILDREN.
11241 When called interactively, PARENT is the current article and CHILDREN
11242 are the process-marked articles."
11243   (interactive
11244    (list (gnus-summary-article-number)
11245          (gnus-summary-work-articles nil)))
11246   (dolist (child children)
11247     (save-window-excursion
11248       (let ((gnus-article-buffer " *reparent*"))
11249         (unless (not (eq parent child))
11250           (error "An article may not be self-referential"))
11251         (let ((message-id (mail-header-id
11252                            (gnus-summary-article-header parent))))
11253           (unless (and message-id (not (equal message-id "")))
11254             (error "No message-id in desired parent"))
11255           (gnus-with-article child
11256             (save-restriction
11257               (goto-char (point-min))
11258               (message-narrow-to-head)
11259               (if (re-search-forward "^References: " nil t)
11260                   (progn
11261                     (re-search-forward "^[^ \t]" nil t)
11262                     (forward-line -1)
11263                     (end-of-line)
11264                     (insert " " message-id))
11265                 (insert "References: " message-id "\n"))))
11266           (set-buffer gnus-summary-buffer)
11267           (gnus-summary-unmark-all-processable)
11268           (gnus-summary-update-article child)
11269           (when (gnus-summary-goto-subject (cdr gnus-article-current) nil t)
11270             (gnus-summary-update-secondary-mark (cdr gnus-article-current)))
11271           (gnus-summary-rethread-current)
11272           (gnus-message 3 "Article %d is now the child of article %d"
11273                         child parent))))))
11274
11275 (defun gnus-summary-toggle-threads (&optional arg)
11276   "Toggle showing conversation threads.
11277 If ARG is positive number, turn showing conversation threads on."
11278   (interactive "P")
11279   (let ((current (or (gnus-summary-article-number) gnus-newsgroup-end)))
11280     (setq gnus-show-threads
11281           (if (null arg) (not gnus-show-threads)
11282             (> (prefix-numeric-value arg) 0)))
11283     (gnus-summary-prepare)
11284     (gnus-summary-goto-subject current)
11285     (gnus-message 6 "Threading is now %s" (if gnus-show-threads "on" "off"))
11286     (gnus-summary-position-point)))
11287
11288 (eval-and-compile
11289   (if (fboundp 'remove-overlays)
11290       (defalias 'gnus-remove-overlays 'remove-overlays)
11291     (defun gnus-remove-overlays (beg end name val)
11292       "Clear BEG and END of overlays whose property NAME has value VAL.
11293 For compatibility with Emacs 21 and XEmacs."
11294       (dolist (ov (gnus-overlays-in beg end))
11295         (when (eq (gnus-overlay-get ov name) val)
11296           (gnus-delete-overlay ov))))))
11297
11298 (defun gnus-summary-show-all-threads ()
11299   "Show all threads."
11300   (interactive)
11301   (gnus-remove-overlays (point-min) (point-max) 'invisible 'gnus-sum)
11302   (gnus-summary-position-point))
11303
11304 (defun gnus-summary-show-thread ()
11305   "Show thread subtrees.
11306 Returns nil if no thread was there to be shown."
11307   (interactive)
11308   (let* ((orig (point))
11309          (end (point-at-eol))
11310          ;; Leave point at bol
11311          (beg (progn (beginning-of-line) (if (bobp) (point) (1- (point)))))
11312          (eoi (when (eq (get-char-property end 'invisible) 'gnus-sum)
11313                 (if (fboundp 'next-single-char-property-change)
11314                     (or (next-single-char-property-change end 'invisible)
11315                         (point-max))
11316                   (while (progn
11317                            (end-of-line 2)
11318                            (and (not (eobp))
11319                                 (eq (get-char-property (point) 'invisible)
11320                                     'gnus-sum))))
11321                   (point)))))
11322     (when eoi
11323       (gnus-remove-overlays beg eoi 'invisible 'gnus-sum)
11324       (goto-char orig)
11325       (gnus-summary-position-point)
11326       eoi)))
11327
11328 (defun gnus-summary-maybe-hide-threads ()
11329   "If requested, hide the threads that should be hidden."
11330   (when (and gnus-show-threads
11331              gnus-thread-hide-subtree)
11332     (gnus-summary-hide-all-threads
11333      (if (or (consp gnus-thread-hide-subtree)
11334              (functionp gnus-thread-hide-subtree))
11335          (gnus-make-predicate gnus-thread-hide-subtree)
11336        nil))))
11337
11338 ;;; Hiding predicates.
11339
11340 (defun gnus-article-unread-p (header)
11341   (memq (mail-header-number header) gnus-newsgroup-unreads))
11342
11343 (defun gnus-article-unseen-p (header)
11344   (memq (mail-header-number header) gnus-newsgroup-unseen))
11345
11346 (defun gnus-map-articles (predicate articles)
11347   "Map PREDICATE over ARTICLES and return non-nil if any predicate is non-nil."
11348   (apply 'gnus-or (mapcar predicate
11349                           (mapcar (lambda (number)
11350                                     (gnus-summary-article-header number))
11351                                   articles))))
11352
11353 (defun gnus-summary-hide-all-threads (&optional predicate)
11354   "Hide all thread subtrees.
11355 If PREDICATE is supplied, threads that satisfy this predicate
11356 will not be hidden."
11357   (interactive)
11358   (save-excursion
11359     (goto-char (point-min))
11360     (let ((end nil))
11361       (while (not end)
11362         (when (or (not predicate)
11363                   (gnus-map-articles
11364                    predicate (gnus-summary-article-children)))
11365             (gnus-summary-hide-thread))
11366         (setq end (not (zerop (gnus-summary-next-thread 1 t)))))))
11367   (gnus-summary-position-point))
11368
11369 (defun gnus-summary-hide-thread ()
11370   "Hide thread subtrees.
11371 If PREDICATE is supplied, threads that satisfy this predicate
11372 will not be hidden.
11373 Returns nil if no threads were there to be hidden."
11374   (interactive)
11375   (let ((start (point))
11376         (starteol (line-end-position))
11377         (article (gnus-summary-article-number)))
11378     (goto-char start)
11379     ;; Go forward until either the buffer ends or the subthread ends.
11380     (when (and (not (eobp))
11381                (or (zerop (gnus-summary-next-thread 1 t))
11382                    (goto-char (point-max))))
11383       (if (and (> (point) start)
11384                ;; FIXME: this should actually search for a non-invisible \n.
11385                (search-backward "\n" start t))
11386           (progn
11387             (when (> (point) starteol)
11388               (gnus-remove-overlays starteol (point) 'invisible 'gnus-sum)
11389               (let ((ol (gnus-make-overlay starteol (point) nil t nil)))
11390                 (gnus-overlay-put ol 'invisible 'gnus-sum)
11391                 (gnus-overlay-put ol 'evaporate t)))
11392             (gnus-summary-goto-subject article))
11393         (goto-char start)
11394         nil))))
11395
11396 (defun gnus-summary-go-to-next-thread (&optional previous)
11397   "Go to the same level (or less) next thread.
11398 If PREVIOUS is non-nil, go to previous thread instead.
11399 Return the article number moved to, or nil if moving was impossible."
11400   (let ((level (gnus-summary-thread-level))
11401         (way (if previous -1 1))
11402         (beg (point)))
11403     (forward-line way)
11404     (while (and (not (eobp))
11405                 (< level (gnus-summary-thread-level)))
11406       (forward-line way))
11407     (if (eobp)
11408         (progn
11409           (goto-char beg)
11410           nil)
11411       (setq beg (point))
11412       (prog1
11413           (gnus-summary-article-number)
11414         (goto-char beg)))))
11415
11416 (defun gnus-summary-next-thread (n &optional silent)
11417   "Go to the same level next N'th thread.
11418 If N is negative, search backward instead.
11419 Returns the difference between N and the number of skips actually
11420 done.
11421
11422 If SILENT, don't output messages."
11423   (interactive "p")
11424   (let ((backward (< n 0))
11425         (n (abs n)))
11426     (while (and (> n 0)
11427                 (gnus-summary-go-to-next-thread backward))
11428       (decf n))
11429     (unless silent
11430       (gnus-summary-position-point))
11431     (when (and (not silent) (/= 0 n))
11432       (gnus-message 7 "No more threads"))
11433     n))
11434
11435 (defun gnus-summary-prev-thread (n)
11436   "Go to the same level previous N'th thread.
11437 Returns the difference between N and the number of skips actually
11438 done."
11439   (interactive "p")
11440   (gnus-summary-next-thread (- n)))
11441
11442 (defun gnus-summary-go-down-thread ()
11443   "Go down one level in the current thread."
11444   (let ((children (gnus-summary-article-children)))
11445     (when children
11446       (gnus-summary-goto-subject (car children)))))
11447
11448 (defun gnus-summary-go-up-thread ()
11449   "Go up one level in the current thread."
11450   (let ((parent (gnus-summary-article-parent)))
11451     (when parent
11452       (gnus-summary-goto-subject parent))))
11453
11454 (defun gnus-summary-down-thread (n)
11455   "Go down thread N steps.
11456 If N is negative, go up instead.
11457 Returns the difference between N and how many steps down that were
11458 taken."
11459   (interactive "p")
11460   (let ((up (< n 0))
11461         (n (abs n)))
11462     (while (and (> n 0)
11463                 (if up (gnus-summary-go-up-thread)
11464                   (gnus-summary-go-down-thread)))
11465       (setq n (1- n)))
11466     (gnus-summary-position-point)
11467     (when (/= 0 n)
11468       (gnus-message 7 "Can't go further"))
11469     n))
11470
11471 (defun gnus-summary-up-thread (n)
11472   "Go up thread N steps.
11473 If N is negative, go down instead.
11474 Returns the difference between N and how many steps down that were
11475 taken."
11476   (interactive "p")
11477   (gnus-summary-down-thread (- n)))
11478
11479 (defun gnus-summary-top-thread ()
11480   "Go to the top of the thread."
11481   (interactive)
11482   (while (gnus-summary-go-up-thread))
11483   (gnus-summary-article-number))
11484
11485 (defun gnus-summary-expire-thread ()
11486   "Mark articles under current thread as expired."
11487   (interactive)
11488   (gnus-summary-kill-thread 0))
11489
11490 (defun gnus-summary-kill-thread (&optional unmark)
11491   "Mark articles under current thread as read.
11492 If the prefix argument is positive, remove any kinds of marks.
11493 If the prefix argument is zero, mark thread as expired.
11494 If the prefix argument is negative, tick articles instead."
11495   (interactive "P")
11496   (when unmark
11497     (setq unmark (prefix-numeric-value unmark)))
11498   (let ((articles (gnus-summary-articles-in-thread))
11499         (hide (or (null unmark) (= unmark 0))))
11500     (save-excursion
11501       ;; Expand the thread.
11502       (gnus-summary-show-thread)
11503       ;; Mark all the articles.
11504       (while articles
11505         (gnus-summary-goto-subject (car articles))
11506         (cond ((null unmark)
11507                (gnus-summary-mark-article-as-read gnus-killed-mark))
11508               ((> unmark 0)
11509                (gnus-summary-mark-article-as-unread gnus-unread-mark))
11510               ((= unmark 0)
11511                (gnus-summary-mark-article nil gnus-expirable-mark))
11512               (t
11513                (gnus-summary-mark-article-as-unread gnus-ticked-mark)))
11514         (setq articles (cdr articles))))
11515     ;; Hide killed subtrees when hide is true.
11516     (and hide
11517          gnus-thread-hide-killed
11518          (gnus-summary-hide-thread))
11519     ;; If hide is t, go to next unread subject.
11520     (when hide
11521       ;; Go to next unread subject.
11522       (gnus-summary-next-subject 1 t)))
11523   (gnus-set-mode-line 'summary))
11524
11525 ;; Summary sorting commands
11526
11527 (defun gnus-summary-sort-by-number (&optional reverse)
11528   "Sort the summary buffer by article number.
11529 Argument REVERSE means reverse order."
11530   (interactive "P")
11531   (gnus-summary-sort 'number reverse))
11532
11533 (defun gnus-summary-sort-by-most-recent-number (&optional reverse)
11534   "Sort the summary buffer by most recent article number.
11535 Argument REVERSE means reverse order."
11536   (interactive "P")
11537   (gnus-summary-sort 'most-recent-number reverse))
11538
11539 (defun gnus-summary-sort-by-random (&optional reverse)
11540   "Randomize the order in the summary buffer.
11541 Argument REVERSE means to randomize in reverse order."
11542   (interactive "P")
11543   (gnus-summary-sort 'random reverse))
11544
11545 (defun gnus-summary-sort-by-author (&optional reverse)
11546   "Sort the summary buffer by author name alphabetically.
11547 If `case-fold-search' is non-nil, case of letters is ignored.
11548 Argument REVERSE means reverse order."
11549   (interactive "P")
11550   (gnus-summary-sort 'author reverse))
11551
11552 (defun gnus-summary-sort-by-recipient (&optional reverse)
11553   "Sort the summary buffer by recipient name alphabetically.
11554 If `case-fold-search' is non-nil, case of letters is ignored.
11555 Argument REVERSE means reverse order."
11556   (interactive "P")
11557   (gnus-summary-sort 'recipient reverse))
11558
11559 (defun gnus-summary-sort-by-subject (&optional reverse)
11560   "Sort the summary buffer by subject alphabetically.  `Re:'s are ignored.
11561 If `case-fold-search' is non-nil, case of letters is ignored.
11562 Argument REVERSE means reverse order."
11563   (interactive "P")
11564   (gnus-summary-sort 'subject reverse))
11565
11566 (defun gnus-summary-sort-by-date (&optional reverse)
11567   "Sort the summary buffer by date.
11568 Argument REVERSE means reverse order."
11569   (interactive "P")
11570   (gnus-summary-sort 'date reverse))
11571
11572 (defun gnus-summary-sort-by-most-recent-date (&optional reverse)
11573   "Sort the summary buffer by most recent date.
11574 Argument REVERSE means reverse order."
11575   (interactive "P")
11576   (gnus-summary-sort 'most-recent-date reverse))
11577
11578 (defun gnus-summary-sort-by-score (&optional reverse)
11579   "Sort the summary buffer by score.
11580 Argument REVERSE means reverse order."
11581   (interactive "P")
11582   (gnus-summary-sort 'score reverse))
11583
11584 (defun gnus-summary-sort-by-lines (&optional reverse)
11585   "Sort the summary buffer by the number of lines.
11586 Argument REVERSE means reverse order."
11587   (interactive "P")
11588   (gnus-summary-sort 'lines reverse))
11589
11590 (defun gnus-summary-sort-by-chars (&optional reverse)
11591   "Sort the summary buffer by article length.
11592 Argument REVERSE means reverse order."
11593   (interactive "P")
11594   (gnus-summary-sort 'chars reverse))
11595
11596 (defun gnus-summary-sort-by-original (&optional reverse)
11597   "Sort the summary buffer using the default sorting method.
11598 Argument REVERSE means reverse order."
11599   (interactive "P")
11600   (let* ((inhibit-read-only t)
11601          (gnus-summary-prepare-hook nil))
11602     ;; We do the sorting by regenerating the threads.
11603     (gnus-summary-prepare)
11604     ;; Hide subthreads if needed.
11605     (gnus-summary-maybe-hide-threads)))
11606
11607 (defun gnus-summary-sort (predicate reverse)
11608   "Sort summary buffer by PREDICATE.  REVERSE means reverse order."
11609   (let* ((thread (intern (format "gnus-thread-sort-by-%s" predicate)))
11610          (article (intern (format "gnus-article-sort-by-%s" predicate)))
11611          (gnus-thread-sort-functions
11612           (if (not reverse)
11613               thread
11614             `(lambda (t1 t2)
11615                (,thread t2 t1))))
11616          (gnus-sort-gathered-threads-function
11617           gnus-thread-sort-functions)
11618          (gnus-article-sort-functions
11619           (if (not reverse)
11620               article
11621             `(lambda (t1 t2)
11622                (,article t2 t1))))
11623          (inhibit-read-only t)
11624          (gnus-summary-prepare-hook nil))
11625     ;; We do the sorting by regenerating the threads.
11626     (gnus-summary-prepare)
11627     ;; Hide subthreads if needed.
11628     (gnus-summary-maybe-hide-threads)))
11629
11630 ;; Summary saving commands.
11631
11632 (defun gnus-summary-save-article (&optional n not-saved)
11633   "Save the current article using the default saver function.
11634 If N is a positive number, save the N next articles.
11635 If N is a negative number, save the N previous articles.
11636 If N is nil and any articles have been marked with the process mark,
11637 save those articles instead.
11638 The variable `gnus-default-article-saver' specifies the saver function.
11639
11640 If the optional second argument NOT-SAVED is non-nil, articles saved
11641 will not be marked as saved."
11642   (interactive "P")
11643   (require 'gnus-art)
11644   (let* ((articles (gnus-summary-work-articles n))
11645          (save-buffer (save-excursion
11646                         (nnheader-set-temp-buffer " *Gnus Save*")))
11647          (num (length articles))
11648          ;; Whether to save decoded articles or raw articles.
11649          (decode (when gnus-article-save-coding-system
11650                    (get gnus-default-article-saver :decode)))
11651          ;; When saving many articles in a single file, use the other
11652          ;; function to save articles other than the first one.
11653          (saver2 (get gnus-default-article-saver :function))
11654          (gnus-prompt-before-saving (if saver2
11655                                         t
11656                                       gnus-prompt-before-saving))
11657          (gnus-default-article-saver gnus-default-article-saver)
11658          header file)
11659     (dolist (article articles)
11660       (setq header (gnus-summary-article-header article))
11661       (if (not (vectorp header))
11662           ;; This is a pseudo-article.
11663           (if (assq 'name header)
11664               (gnus-copy-file (cdr (assq 'name header)))
11665             (gnus-message 1 "Article %d is unsaveable" article))
11666         ;; This is a real article.
11667         (save-window-excursion
11668           (gnus-summary-select-article decode decode nil article)
11669           (gnus-summary-goto-subject article))
11670         (with-current-buffer save-buffer
11671           (erase-buffer)
11672           (insert-buffer-substring (if decode
11673                                        gnus-article-buffer
11674                                      gnus-original-article-buffer)))
11675         (setq file (gnus-article-save save-buffer file num))
11676         (gnus-summary-remove-process-mark article)
11677         (unless not-saved
11678           (gnus-summary-set-saved-mark article)))
11679       (when saver2
11680         (setq gnus-default-article-saver saver2
11681               saver2 nil)))
11682     (gnus-kill-buffer save-buffer)
11683     (gnus-summary-position-point)
11684     (gnus-set-mode-line 'summary)
11685     n))
11686
11687 (defun gnus-summary-pipe-output (&optional n sym)
11688   "Pipe the current article to a subprocess.
11689 If N is a positive number, pipe the N next articles.
11690 If N is a negative number, pipe the N previous articles.
11691 If N is nil and any articles have been marked with the process mark,
11692 pipe those articles instead.
11693 The default command to which articles are piped is specified by the
11694 variable `gnus-summary-pipe-output-default-command'; if it is nil, you
11695 will be prompted for the command.
11696
11697 The properties `:decode' and `:headers' that are put to the function
11698 symbol `gnus-summary-save-in-pipe' control whether this function
11699 decodes articles and what headers to keep (see the doc string for the
11700 `gnus-default-article-saver' variable).  If SYM (the symbolic prefix)
11701 is neither omitted nor the symbol `r', force including all headers
11702 regardless of the `:headers' property.  If it is the symbol `r',
11703 articles that are not decoded and include all headers will be piped
11704 no matter what the properties `:decode' and `:headers' are."
11705   (interactive (gnus-interactive "P\ny"))
11706   (require 'gnus-art)
11707   (let* ((articles (gnus-summary-work-articles n))
11708          (result-buffer "*Shell Command Output*")
11709          (all-headers (not (memq sym '(nil r))))
11710          (gnus-save-all-headers (or all-headers gnus-save-all-headers))
11711          (raw (eq sym 'r))
11712          (headers (get 'gnus-summary-save-in-pipe :headers))
11713          command result)
11714     (unless (numberp (car articles))
11715       (error "No article to pipe"))
11716     (setq command (gnus-read-shell-command
11717                    (concat "Shell command on "
11718                            (if (cdr articles)
11719                                (format "these %d articles" (length articles))
11720                              "this article")
11721                            ": ")
11722                    gnus-summary-pipe-output-default-command))
11723     (when (string-equal command "")
11724       (error "A command is required"))
11725     (when all-headers
11726       (put 'gnus-summary-save-in-pipe :headers nil))
11727     (unwind-protect
11728         (while articles
11729           (gnus-summary-goto-subject (pop articles))
11730           (save-window-excursion (gnus-summary-save-in-pipe command raw))
11731           (when (and (get-buffer result-buffer)
11732                      (not (zerop (buffer-size (get-buffer result-buffer)))))
11733             (setq result (concat result (with-current-buffer result-buffer
11734                                           (buffer-string))))))
11735       (put 'gnus-summary-save-in-pipe :headers headers))
11736     (unless (zerop (length result))
11737       (if (with-current-buffer (get-buffer-create result-buffer)
11738             (erase-buffer)
11739             (insert result)
11740             (prog1
11741                 (and (= (count-lines (point-min) (point)) 1)
11742                      (progn
11743                        (end-of-line 0)
11744                        (<= (current-column)
11745                            (window-width (minibuffer-window)))))
11746               (goto-char (point-min))))
11747           (message "%s" (substring result 0 -1))
11748         (message nil)
11749         (gnus-configure-windows 'pipe)))))
11750
11751 (defun gnus-summary-save-article-mail (&optional arg)
11752   "Append the current article to a Unix mail box file.
11753 If N is a positive number, save the N next articles.
11754 If N is a negative number, save the N previous articles.
11755 If N is nil and any articles have been marked with the process mark,
11756 save those articles instead."
11757   (interactive "P")
11758   (require 'gnus-art)
11759   (let ((gnus-default-article-saver 'gnus-summary-save-in-mail))
11760     (gnus-summary-save-article arg)))
11761
11762 (defun gnus-summary-save-article-rmail (&optional arg)
11763   "Append the current article to an rmail file.
11764 If N is a positive number, save the N next articles.
11765 If N is a negative number, save the N previous articles.
11766 If N is nil and any articles have been marked with the process mark,
11767 save those articles instead."
11768   (interactive "P")
11769   (require 'gnus-art)
11770   (let ((gnus-default-article-saver 'gnus-summary-save-in-rmail))
11771     (gnus-summary-save-article arg)))
11772
11773 (defun gnus-summary-save-article-file (&optional arg)
11774   "Append the current article to a file.
11775 If N is a positive number, save the N next articles.
11776 If N is a negative number, save the N previous articles.
11777 If N is nil and any articles have been marked with the process mark,
11778 save those articles instead."
11779   (interactive "P")
11780   (require 'gnus-art)
11781   (let ((gnus-default-article-saver 'gnus-summary-save-in-file))
11782     (gnus-summary-save-article arg)))
11783
11784 (defun gnus-summary-write-article-file (&optional arg)
11785   "Write the current article to a file, deleting the previous file.
11786 If N is a positive number, save the N next articles.
11787 If N is a negative number, save the N previous articles.
11788 If N is nil and any articles have been marked with the process mark,
11789 save those articles instead."
11790   (interactive "P")
11791   (require 'gnus-art)
11792   (let ((gnus-default-article-saver 'gnus-summary-write-to-file))
11793     (gnus-summary-save-article arg)))
11794
11795 (defun gnus-summary-save-article-body-file (&optional arg)
11796   "Append the current article body to a file.
11797 If N is a positive number, save the N next articles.
11798 If N is a negative number, save the N previous articles.
11799 If N is nil and any articles have been marked with the process mark,
11800 save those articles instead."
11801   (interactive "P")
11802   (require 'gnus-art)
11803   (let ((gnus-default-article-saver 'gnus-summary-save-body-in-file))
11804     (gnus-summary-save-article arg)))
11805
11806 (defun gnus-summary-write-article-body-file (&optional arg)
11807   "Write the current article body to a file, deleting the previous file.
11808 If N is a positive number, save the N next articles.
11809 If N is a negative number, save the N previous articles.
11810 If N is nil and any articles have been marked with the process mark,
11811 save those articles instead."
11812   (interactive "P")
11813   (require 'gnus-art)
11814   (let ((gnus-default-article-saver 'gnus-summary-write-body-to-file))
11815     (gnus-summary-save-article arg)))
11816
11817 (defun gnus-summary-muttprint (&optional arg)
11818   "Print the current article using Muttprint.
11819 If N is a positive number, save the N next articles.
11820 If N is a negative number, save the N previous articles.
11821 If N is nil and any articles have been marked with the process mark,
11822 save those articles instead."
11823   (interactive "P")
11824   (require 'gnus-art)
11825   (let ((gnus-default-article-saver 'gnus-summary-pipe-to-muttprint))
11826     (gnus-summary-save-article arg t)))
11827
11828 (defun gnus-summary-pipe-message (program)
11829   "Pipe the current article through PROGRAM."
11830   (interactive "sProgram: ")
11831   (gnus-summary-select-article)
11832   (let ((mail-header-separator ""))
11833     (gnus-eval-in-buffer-window gnus-article-buffer
11834       (save-restriction
11835         (widen)
11836         (let ((start (window-start))
11837               (inhibit-read-only t))
11838           (message-pipe-buffer-body program)
11839           (set-window-start (get-buffer-window (current-buffer)) start))))))
11840
11841 (defun gnus-get-split-value (methods)
11842   "Return a value based on the split METHODS."
11843   (let (split-name method result match)
11844     (when methods
11845       (with-current-buffer gnus-original-article-buffer
11846         (save-restriction
11847           (nnheader-narrow-to-headers)
11848           (while (and methods (not split-name))
11849             (goto-char (point-min))
11850             (setq method (pop methods))
11851             (setq match (car method))
11852             (when (cond
11853                    ((stringp match)
11854                     ;; Regular expression.
11855                     (ignore-errors
11856                       (re-search-forward match nil t)))
11857                    ((functionp match)
11858                     ;; Function.
11859                     (save-restriction
11860                       (widen)
11861                       (setq result (funcall match gnus-newsgroup-name))))
11862                    ((consp match)
11863                     ;; Form.
11864                     (save-restriction
11865                       (widen)
11866                       (setq result (eval match)))))
11867               (setq split-name (cdr method))
11868               (cond ((stringp result)
11869                      (push (expand-file-name
11870                             result gnus-article-save-directory)
11871                            split-name))
11872                     ((consp result)
11873                      (setq split-name (append result split-name)))))))))
11874     (nreverse split-name)))
11875
11876 (defun gnus-valid-move-group-p (group)
11877   (and (boundp group)
11878        (symbol-name group)
11879        (symbol-value group)
11880        (gnus-get-function (gnus-find-method-for-group
11881                            (symbol-name group)) 'request-accept-article t)))
11882
11883 (defun gnus-read-move-group-name (prompt default articles prefix)
11884   "Read a group name."
11885   (let* ((split-name (gnus-get-split-value gnus-move-split-methods))
11886          (minibuffer-confirm-incomplete nil) ; XEmacs
11887          (prom
11888           (format "%s %s to"
11889                   prompt
11890                   (if (> (length articles) 1)
11891                       (format "these %d articles" (length articles))
11892                     "this article")))
11893          (to-newsgroup
11894           (let (active group)
11895             (when (or (null split-name) (= 1 (length split-name)))
11896               (setq active (gnus-make-hashtable (length gnus-active-hashtb)))
11897               (mapatoms (lambda (symbol)
11898                           (setq group (symbol-name symbol))
11899                           (when (string-match "[^\000-\177]" group)
11900                             (setq group (gnus-group-decoded-name group)))
11901                           (set (intern group active) group))
11902                         gnus-active-hashtb))
11903             (cond
11904              ((null split-name)
11905               (gnus-completing-read-with-default
11906                default prom active 'gnus-valid-move-group-p nil prefix
11907                'gnus-group-history))
11908              ((= 1 (length split-name))
11909               (gnus-completing-read-with-default
11910                (car split-name) prom active 'gnus-valid-move-group-p nil nil
11911                'gnus-group-history))
11912              (t
11913               (gnus-completing-read-with-default
11914                nil prom (mapcar 'list (nreverse split-name)) nil nil nil
11915                'gnus-group-history)))))
11916          (to-method (gnus-server-to-method (gnus-group-method to-newsgroup)))
11917          encoded)
11918     (when to-newsgroup
11919       (if (or (string= to-newsgroup "")
11920               (string= to-newsgroup prefix))
11921           (setq to-newsgroup default))
11922       (unless to-newsgroup
11923         (error "No group name entered"))
11924       (setq encoded (mm-encode-coding-string
11925                      to-newsgroup
11926                      (gnus-group-name-charset to-method to-newsgroup)))
11927       (or (gnus-active encoded)
11928           (gnus-activate-group encoded nil nil to-method)
11929           (if (gnus-y-or-n-p (format "No such group: %s.  Create it? "
11930                                      to-newsgroup))
11931               (or (and (gnus-request-create-group encoded to-method)
11932                        (gnus-activate-group encoded nil nil to-method)
11933                        (gnus-subscribe-group encoded))
11934                   (error "Couldn't create group %s" to-newsgroup)))
11935           (error "No such group: %s" to-newsgroup))
11936       encoded)))
11937
11938 (defvar gnus-summary-save-parts-counter)
11939 (declare-function mm-uu-dissect "mm-uu" (&optional noheader mime-type))
11940
11941 (defun gnus-summary-save-parts (type dir n &optional reverse)
11942   "Save parts matching TYPE to DIR.
11943 If REVERSE, save parts that do not match TYPE."
11944   (interactive
11945    (list (read-string "Save parts of type: "
11946                       (or (car gnus-summary-save-parts-type-history)
11947                           gnus-summary-save-parts-default-mime)
11948                       'gnus-summary-save-parts-type-history)
11949          (setq gnus-summary-save-parts-last-directory
11950                (read-file-name "Save to directory: "
11951                                gnus-summary-save-parts-last-directory
11952                                nil t))
11953          current-prefix-arg))
11954   (gnus-summary-iterate n
11955     (let ((gnus-display-mime-function nil)
11956           gnus-article-prepare-hook
11957           gnus-article-decode-hook
11958           gnus-display-mime-function
11959           gnus-break-pages
11960           (gnus-inhibit-treatment t))
11961       (gnus-summary-select-article))
11962     (with-current-buffer gnus-article-buffer
11963       (let ((handles (or gnus-article-mime-handles
11964                          (mm-dissect-buffer nil gnus-article-loose-mime)
11965                          (and gnus-article-emulate-mime
11966                               (mm-uu-dissect))))
11967             (gnus-summary-save-parts-counter 1))
11968         (when handles
11969           (gnus-summary-save-parts-1 type dir handles reverse)
11970           (unless gnus-article-mime-handles ;; Don't destroy this case.
11971             (mm-destroy-parts handles)))))))
11972
11973 (defun gnus-summary-save-parts-1 (type dir handle reverse)
11974   (if (stringp (car handle))
11975       (mapcar (lambda (h) (gnus-summary-save-parts-1 type dir h reverse))
11976               (cdr handle))
11977     (when (if reverse
11978               (not (string-match type (mm-handle-media-type handle)))
11979             (string-match type (mm-handle-media-type handle)))
11980       (let ((file (expand-file-name
11981                    (gnus-map-function
11982                     mm-file-name-rewrite-functions
11983                     (file-name-nondirectory
11984                      (or
11985                       (mail-content-type-get
11986                        (mm-handle-disposition handle) 'filename)
11987                       (mail-content-type-get
11988                        (mm-handle-type handle) 'name)
11989                       (format "%s.%d.%d" gnus-newsgroup-name
11990                               (cdr gnus-article-current)
11991                               gnus-summary-save-parts-counter))))
11992                    dir)))
11993         (incf gnus-summary-save-parts-counter)
11994         (unless (file-exists-p file)
11995           (mm-save-part-to-file handle file))))))
11996
11997 ;; Summary extract commands
11998
11999 (defun gnus-summary-insert-pseudos (pslist &optional not-view)
12000   (let ((inhibit-read-only t)
12001         (article (gnus-summary-article-number))
12002         after-article b e)
12003     (unless (gnus-summary-goto-subject article)
12004       (error "No such article: %d" article))
12005     (gnus-summary-position-point)
12006     ;; If all commands are to be bunched up on one line, we collect
12007     ;; them here.
12008     (unless gnus-view-pseudos-separately
12009       (let ((ps (setq pslist (sort pslist 'gnus-pseudos<)))
12010             files action)
12011         (while ps
12012           (setq action (cdr (assq 'action (car ps))))
12013           (setq files (list (cdr (assq 'name (car ps)))))
12014           (while (and ps (cdr ps)
12015                       (string= (or action "1")
12016                                (or (cdr (assq 'action (cadr ps))) "2")))
12017             (push (cdr (assq 'name (cadr ps))) files)
12018             (setcdr ps (cddr ps)))
12019           (when files
12020             (when (not (string-match "%s" action))
12021               (push " " files))
12022             (push " " files)
12023             (when (assq 'execute (car ps))
12024               (setcdr (assq 'execute (car ps))
12025                       (funcall (if (string-match "%s" action)
12026                                    'format 'concat)
12027                                action
12028                                (mapconcat
12029                                 (lambda (f)
12030                                   (if (equal f " ")
12031                                       f
12032                                     (shell-quote-argument f)))
12033                                 files " ")))))
12034           (setq ps (cdr ps)))))
12035     (if (and gnus-view-pseudos (not not-view))
12036         (while pslist
12037           (when (assq 'execute (car pslist))
12038             (gnus-execute-command (cdr (assq 'execute (car pslist)))
12039                                   (eq gnus-view-pseudos 'not-confirm)))
12040           (setq pslist (cdr pslist)))
12041       (save-excursion
12042         (while pslist
12043           (setq after-article (or (cdr (assq 'article (car pslist)))
12044                                   (gnus-summary-article-number)))
12045           (gnus-summary-goto-subject after-article)
12046           (forward-line 1)
12047           (setq b (point))
12048           (insert "    " (file-name-nondirectory
12049                           (cdr (assq 'name (car pslist))))
12050                   ": " (or (cdr (assq 'execute (car pslist))) "") "\n")
12051           (setq e (point))
12052           (forward-line -1)             ; back to `b'
12053           (gnus-add-text-properties
12054            b (1- e) (list 'gnus-number gnus-reffed-article-number
12055                           gnus-mouse-face-prop gnus-mouse-face))
12056           (gnus-data-enter
12057            after-article gnus-reffed-article-number
12058            gnus-unread-mark b (car pslist) 0 (- e b))
12059           (setq gnus-newsgroup-unreads
12060                 (gnus-add-to-sorted-list gnus-newsgroup-unreads
12061                                          gnus-reffed-article-number))
12062           (setq gnus-reffed-article-number (1- gnus-reffed-article-number))
12063           (setq pslist (cdr pslist)))))))
12064
12065 (defun gnus-pseudos< (p1 p2)
12066   (let ((c1 (cdr (assq 'action p1)))
12067         (c2 (cdr (assq 'action p2))))
12068     (and c1 c2 (string< c1 c2))))
12069
12070 (defun gnus-request-pseudo-article (props)
12071   (cond ((assq 'execute props)
12072          (gnus-execute-command (cdr (assq 'execute props)))))
12073   (let ((gnus-current-article (gnus-summary-article-number)))
12074     (gnus-run-hooks 'gnus-mark-article-hook)))
12075
12076 (defun gnus-execute-command (command &optional automatic)
12077   (save-excursion
12078     (gnus-article-setup-buffer)
12079     (set-buffer gnus-article-buffer)
12080     (setq buffer-read-only nil)
12081     (let ((command (if automatic command
12082                      (read-string "Command: " (cons command 0)))))
12083       (erase-buffer)
12084       (insert "$ " command "\n\n")
12085       (if gnus-view-pseudo-asynchronously
12086           (start-process "gnus-execute" (current-buffer) shell-file-name
12087                          shell-command-switch command)
12088         (call-process shell-file-name nil t nil
12089                       shell-command-switch command)))))
12090
12091 ;; Summary kill commands.
12092
12093 (defun gnus-summary-edit-global-kill (article)
12094   "Edit the \"global\" kill file."
12095   (interactive (list (gnus-summary-article-number)))
12096   (gnus-group-edit-global-kill article))
12097
12098 (defun gnus-summary-edit-local-kill ()
12099   "Edit a local kill file applied to the current newsgroup."
12100   (interactive)
12101   (setq gnus-current-headers (gnus-summary-article-header))
12102   (gnus-group-edit-local-kill
12103    (gnus-summary-article-number) gnus-newsgroup-name))
12104
12105 ;;; Header reading.
12106
12107 (defun gnus-read-header (id &optional header)
12108   "Read the headers of article ID and enter them into the Gnus system."
12109   (let ((group gnus-newsgroup-name)
12110         (gnus-override-method
12111          (or
12112           gnus-override-method
12113           (and (gnus-news-group-p gnus-newsgroup-name)
12114                (car (gnus-refer-article-methods)))))
12115         where)
12116     ;; First we check to see whether the header in question is already
12117     ;; fetched.
12118     (if (stringp id)
12119         ;; This is a Message-ID.
12120         (setq header (or header (gnus-id-to-header id)))
12121       ;; This is an article number.
12122       (setq header (or header (gnus-summary-article-header id))))
12123     (if (and header
12124              (not (gnus-summary-article-sparse-p (mail-header-number header))))
12125         ;; We have found the header.
12126         header
12127       ;; We have to really fetch the header to this article.
12128       (with-current-buffer nntp-server-buffer
12129         (when (setq where (gnus-request-head id group))
12130           (nnheader-fold-continuation-lines)
12131           (goto-char (point-max))
12132           (insert ".\n")
12133           (goto-char (point-min))
12134           (insert "211 ")
12135           (princ (cond
12136                   ((numberp id) id)
12137                   ((cdr where) (cdr where))
12138                   (header (mail-header-number header))
12139                   (t gnus-reffed-article-number))
12140                  (current-buffer))
12141           (insert " Article retrieved.\n"))
12142         (if (or (not where)
12143                 (not (setq header (car (gnus-get-newsgroup-headers nil t)))))
12144             ()                          ; Malformed head.
12145           (unless (gnus-summary-article-sparse-p (mail-header-number header))
12146             (when (and (stringp id)
12147                        (or
12148                         (not (string= (gnus-group-real-name group)
12149                                       (car where)))
12150                         (not (gnus-server-equal gnus-override-method
12151                                                 (gnus-group-method group)))))
12152               ;; If we fetched by Message-ID and the article came from
12153               ;; a different group (or server), we fudge some bogus
12154               ;; article numbers for this article.
12155               (mail-header-set-number header gnus-reffed-article-number))
12156             (with-current-buffer gnus-summary-buffer
12157               (decf gnus-reffed-article-number)
12158               (gnus-remove-header (mail-header-number header))
12159               (push header gnus-newsgroup-headers)
12160               (setq gnus-current-headers header)
12161               (push (mail-header-number header) gnus-newsgroup-limit)))
12162           header)))))
12163
12164 (defun gnus-remove-header (number)
12165   "Remove header NUMBER from `gnus-newsgroup-headers'."
12166   (if (and gnus-newsgroup-headers
12167            (= number (mail-header-number (car gnus-newsgroup-headers))))
12168       (pop gnus-newsgroup-headers)
12169     (let ((headers gnus-newsgroup-headers))
12170       (while (and (cdr headers)
12171                   (not (= number (mail-header-number (cadr headers)))))
12172         (pop headers))
12173       (when (cdr headers)
12174         (setcdr headers (cddr headers))))))
12175
12176 ;;;
12177 ;;; summary highlights
12178 ;;;
12179
12180 (defun gnus-highlight-selected-summary ()
12181   "Highlight selected article in summary buffer."
12182   ;; Added by Per Abrahamsen <amanda@iesd.auc.dk>.
12183   (when gnus-summary-selected-face
12184     (save-excursion
12185       (let* ((beg (point-at-bol))
12186              (end (point-at-eol))
12187              ;; Fix by Mike Dugan <dugan@bucrf16.bu.edu>.
12188              (from (if (get-text-property beg gnus-mouse-face-prop)
12189                        beg
12190                      (or (next-single-property-change
12191                           beg gnus-mouse-face-prop nil end)
12192                          beg)))
12193              (to
12194               (if (= from end)
12195                   (- from 2)
12196                 (or (next-single-property-change
12197                      from gnus-mouse-face-prop nil end)
12198                     end))))
12199         ;; If no mouse-face prop on line we will have to = from = end,
12200         ;; so we highlight the entire line instead.
12201         (when (= (+ to 2) from)
12202           (setq from beg)
12203           (setq to end))
12204         (if gnus-newsgroup-selected-overlay
12205             ;; Move old overlay.
12206             (gnus-move-overlay
12207              gnus-newsgroup-selected-overlay from to (current-buffer))
12208           ;; Create new overlay.
12209           (gnus-overlay-put
12210            (setq gnus-newsgroup-selected-overlay (gnus-make-overlay from to))
12211            'face gnus-summary-selected-face))))))
12212
12213 (defvar gnus-summary-highlight-line-cached nil)
12214 (defvar gnus-summary-highlight-line-trigger nil)
12215
12216 (defun gnus-summary-highlight-line-0 ()
12217   (if (and (eq gnus-summary-highlight-line-trigger
12218                gnus-summary-highlight)
12219            gnus-summary-highlight-line-cached)
12220       gnus-summary-highlight-line-cached
12221     (setq gnus-summary-highlight-line-trigger gnus-summary-highlight
12222           gnus-summary-highlight-line-cached
12223           (let* ((cond (list 'cond))
12224                  (c cond)
12225                  (list gnus-summary-highlight))
12226             (while list
12227               (setcdr c (cons (list (caar list) (list 'quote (cdar list)))
12228                               nil))
12229               (setq c (cdr c)
12230                     list (cdr list)))
12231             (gnus-byte-compile (list 'lambda nil cond))))))
12232
12233 (defun gnus-summary-highlight-line ()
12234   "Highlight current line according to `gnus-summary-highlight'."
12235   (let* ((beg (point-at-bol))
12236          (article (or (gnus-summary-article-number) gnus-current-article))
12237          (score (or (cdr (assq article
12238                                gnus-newsgroup-scored))
12239                     gnus-summary-default-score 0))
12240          (mark (or (gnus-summary-article-mark) gnus-unread-mark))
12241          (inhibit-read-only t)
12242          (default gnus-summary-default-score)
12243          (default-high gnus-summary-default-high-score)
12244          (default-low gnus-summary-default-low-score)
12245          (uncached (and gnus-summary-use-undownloaded-faces
12246                         (memq article gnus-newsgroup-undownloaded)
12247                         (not (memq article gnus-newsgroup-cached)))))
12248     (let ((face (funcall (gnus-summary-highlight-line-0))))
12249       (unless (eq face (get-text-property beg 'face))
12250         (gnus-put-text-property-excluding-characters-with-faces
12251          beg (point-at-eol) 'face
12252          (setq face (if (boundp face) (symbol-value face) face)))
12253         (when gnus-summary-highlight-line-function
12254           (funcall gnus-summary-highlight-line-function article face))))))
12255
12256 (defun gnus-update-read-articles (group unread &optional compute)
12257   "Update the list of read articles in GROUP.
12258 UNREAD is a sorted list."
12259   (let ((active (or gnus-newsgroup-active (gnus-active group)))
12260         (info (gnus-get-info group))
12261         (prev 1)
12262         read)
12263     (if (or (not info) (not active))
12264         ;; There is no info on this group if it was, in fact,
12265         ;; killed.  Gnus stores no information on killed groups, so
12266         ;; there's nothing to be done.
12267         ;; One could store the information somewhere temporarily,
12268         ;; perhaps...  Hmmm...
12269         ()
12270       ;; Remove any negative articles numbers.
12271       (while (and unread (< (car unread) 0))
12272         (setq unread (cdr unread)))
12273       ;; Remove any expired article numbers
12274       (while (and unread (< (car unread) (car active)))
12275         (setq unread (cdr unread)))
12276       ;; Compute the ranges of read articles by looking at the list of
12277       ;; unread articles.
12278       (while unread
12279         (when (/= (car unread) prev)
12280           (push (if (= prev (1- (car unread))) prev
12281                   (cons prev (1- (car unread))))
12282                 read))
12283         (setq prev (1+ (car unread)))
12284         (setq unread (cdr unread)))
12285       (when (<= prev (cdr active))
12286         (push (cons prev (cdr active)) read))
12287       (setq read (if (> (length read) 1) (nreverse read) read))
12288       (if compute
12289           read
12290         (save-excursion
12291           (let (setmarkundo)
12292             ;; Propagate the read marks to the backend.
12293             (when (and gnus-propagate-marks
12294                        (gnus-check-backend-function 'request-set-mark group))
12295               (let ((del (gnus-remove-from-range (gnus-info-read info) read))
12296                     (add (gnus-remove-from-range read (gnus-info-read info))))
12297                 (when (or add del)
12298                   (unless (gnus-check-group group)
12299                     (error "Can't open server for %s" group))
12300                   (gnus-request-set-mark
12301                    group (delq nil (list (if add (list add 'add '(read)))
12302                                          (if del (list del 'del '(read))))))
12303                   (setq setmarkundo
12304                         `(gnus-request-set-mark
12305                           ,group
12306                           ',(delq nil (list
12307                                        (if del (list del 'add '(read)))
12308                                        (if add (list add 'del '(read))))))))))
12309             (set-buffer gnus-group-buffer)
12310             (gnus-undo-register
12311               `(progn
12312                  (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
12313                  (gnus-info-set-read ',info ',(gnus-info-read info))
12314                  (gnus-get-unread-articles-in-group ',info
12315                                                     (gnus-active ,group))
12316                  (gnus-group-update-group ,group t)
12317                  ,setmarkundo))))
12318         ;; Enter this list into the group info.
12319         (gnus-info-set-read info read)
12320         ;; Set the number of unread articles in gnus-newsrc-hashtb.
12321         (gnus-get-unread-articles-in-group info (gnus-active group))
12322         t))))
12323
12324 (defun gnus-offer-save-summaries ()
12325   "Offer to save all active summary buffers."
12326   (let (buffers)
12327     ;; Go through all buffers and find all summaries.
12328     (dolist (buffer (buffer-list))
12329       (when (and (setq buffer (buffer-name buffer))
12330                  (string-match "Summary" buffer)
12331                  (with-current-buffer buffer
12332                    ;; We check that this is, indeed, a summary buffer.
12333                    (and (eq major-mode 'gnus-summary-mode)
12334                         ;; Also make sure this isn't bogus.
12335                         gnus-newsgroup-prepared
12336                         ;; Also make sure that this isn't a
12337                         ;; dead summary buffer.
12338                         (not gnus-dead-summary-mode))))
12339         (push buffer buffers)))
12340     ;; Go through all these summary buffers and offer to save them.
12341     (when buffers
12342       (save-excursion
12343         (map-y-or-n-p
12344          "Update summary buffer %s? "
12345          (lambda (buf)
12346            (switch-to-buffer buf)
12347            (gnus-summary-exit))
12348          buffers)))))
12349
12350 (defun gnus-summary-setup-default-charset ()
12351   "Setup newsgroup default charset."
12352   (if (member gnus-newsgroup-name '("nndraft:delayed" "nndraft:drafts"))
12353       (setq gnus-newsgroup-charset nil)
12354     (let* ((ignored-charsets
12355             (or gnus-newsgroup-ephemeral-ignored-charsets
12356                 (append
12357                  (and gnus-newsgroup-name
12358                       (gnus-parameter-ignored-charsets gnus-newsgroup-name))
12359                  gnus-newsgroup-ignored-charsets))))
12360       (setq gnus-newsgroup-charset
12361             (or gnus-newsgroup-ephemeral-charset
12362                 (and gnus-newsgroup-name
12363                      (gnus-parameter-charset gnus-newsgroup-name))
12364                 gnus-default-charset))
12365       (set (make-local-variable 'gnus-newsgroup-ignored-charsets)
12366            ignored-charsets))))
12367
12368 ;;;
12369 ;;; Mime Commands
12370 ;;;
12371
12372 (defun gnus-summary-display-buttonized (&optional show-all-parts)
12373   "Display the current article buffer fully MIME-buttonized.
12374 If SHOW-ALL-PARTS (the prefix) is non-nil, all multipart/* parts are
12375 treated as multipart/mixed."
12376   (interactive "P")
12377   (require 'gnus-art)
12378   (let ((gnus-unbuttonized-mime-types nil)
12379         (gnus-mime-display-multipart-as-mixed show-all-parts))
12380     (gnus-summary-show-article)))
12381
12382 (defun gnus-summary-repair-multipart (article)
12383   "Add a Content-Type header to a multipart article without one."
12384   (interactive (list (gnus-summary-article-number)))
12385   (gnus-with-article article
12386     (message-narrow-to-head)
12387     (message-remove-header "Mime-Version")
12388     (goto-char (point-max))
12389     (insert "Mime-Version: 1.0\n")
12390     (widen)
12391     (when (search-forward "\n--" nil t)
12392       (let ((separator (buffer-substring (point) (point-at-eol))))
12393         (message-narrow-to-head)
12394         (message-remove-header "Content-Type")
12395         (goto-char (point-max))
12396         (insert (format "Content-Type: multipart/mixed; boundary=\"%s\"\n"
12397                         separator))
12398         (widen))))
12399   (let (gnus-mark-article-hook)
12400     (gnus-summary-select-article t t nil article)))
12401
12402 (defun gnus-summary-toggle-display-buttonized ()
12403   "Toggle the buttonizing of the article buffer."
12404   (interactive)
12405   (require 'gnus-art)
12406   (if (setq gnus-inhibit-mime-unbuttonizing
12407             (not gnus-inhibit-mime-unbuttonizing))
12408       (let ((gnus-unbuttonized-mime-types nil))
12409         (gnus-summary-show-article))
12410     (gnus-summary-show-article)))
12411
12412 ;;;
12413 ;;; Generic summary marking commands
12414 ;;;
12415
12416 (defvar gnus-summary-marking-alist
12417   '((read gnus-del-mark "d")
12418     (unread gnus-unread-mark "u")
12419     (ticked gnus-ticked-mark "!")
12420     (dormant gnus-dormant-mark "?")
12421     (expirable gnus-expirable-mark "e"))
12422   "An alist of names/marks/keystrokes.")
12423
12424 (defvar gnus-summary-generic-mark-map (make-sparse-keymap))
12425 (defvar gnus-summary-mark-map)
12426
12427 (defun gnus-summary-make-all-marking-commands ()
12428   (define-key gnus-summary-mark-map "M" gnus-summary-generic-mark-map)
12429   (dolist (elem gnus-summary-marking-alist)
12430     (apply 'gnus-summary-make-marking-command elem)))
12431
12432 (defun gnus-summary-make-marking-command (name mark keystroke)
12433   (let ((map (make-sparse-keymap)))
12434     (define-key gnus-summary-generic-mark-map keystroke map)
12435     (dolist (lway `((next "next" next nil "n")
12436                     (next-unread "next unread" next t "N")
12437                     (prev "previous" prev nil "p")
12438                     (prev-unread "previous unread" prev t "P")
12439                     (nomove "" nil nil ,keystroke)))
12440       (let ((func (gnus-summary-make-marking-command-1
12441                    mark (car lway) lway name)))
12442         (setq func (eval func))
12443         (define-key map (nth 4 lway) func)))))
12444
12445 (defun gnus-summary-make-marking-command-1 (mark way lway name)
12446   `(defun ,(intern
12447             (format "gnus-summary-put-mark-as-%s%s"
12448                     name (if (eq way 'nomove)
12449                              ""
12450                            (concat "-" (symbol-name way)))))
12451      (n)
12452      ,(format
12453        "Mark the current article as %s%s.
12454 If N, the prefix, then repeat N times.
12455 If N is negative, move in reverse order.
12456 The difference between N and the actual number of articles marked is
12457 returned."
12458        name (cadr lway))
12459      (interactive "p")
12460      (gnus-summary-generic-mark n ,mark ',(nth 2 lway) ,(nth 3 lway))))
12461
12462 (defun gnus-summary-generic-mark (n mark move unread)
12463   "Mark N articles with MARK."
12464   (unless (eq major-mode 'gnus-summary-mode)
12465     (error "This command can only be used in the summary buffer"))
12466   (gnus-summary-show-thread)
12467   (let ((nummove
12468          (cond
12469           ((eq move 'next) 1)
12470           ((eq move 'prev) -1)
12471           (t 0))))
12472     (if (zerop nummove)
12473         (setq n 1)
12474       (when (< n 0)
12475         (setq n (abs n)
12476               nummove (* -1 nummove))))
12477     (while (and (> n 0)
12478                 (gnus-summary-mark-article nil mark)
12479                 (zerop (gnus-summary-next-subject nummove unread t)))
12480       (setq n (1- n)))
12481     (when (/= 0 n)
12482       (gnus-message 7 "No more %sarticles" (if mark "" "unread ")))
12483     (gnus-summary-recenter)
12484     (gnus-summary-position-point)
12485     (gnus-set-mode-line 'summary)
12486     n))
12487
12488 (defun gnus-summary-insert-articles (articles)
12489   (when (setq articles
12490               (gnus-sorted-difference articles
12491                                       (mapcar (lambda (h)
12492                                                 (mail-header-number h))
12493                                               gnus-newsgroup-headers)))
12494     (setq gnus-newsgroup-headers
12495           (gnus-merge 'list
12496                       gnus-newsgroup-headers
12497                       (gnus-fetch-headers articles)
12498                       'gnus-article-sort-by-number))
12499     ;; Suppress duplicates?
12500     (when gnus-suppress-duplicates
12501       (gnus-dup-suppress-articles))
12502
12503     (if (and gnus-fetch-old-headers
12504              (eq gnus-headers-retrieved-by 'nov))
12505         ;; We might want to build some more threads first.
12506         (if (eq gnus-fetch-old-headers 'invisible)
12507             (gnus-build-all-threads)
12508           (gnus-build-old-threads))
12509       ;; Mark the inserted articles that are unread as unread.
12510       (setq gnus-newsgroup-unreads
12511             (gnus-sorted-nunion
12512              gnus-newsgroup-unreads
12513              (gnus-sorted-nintersection
12514               (gnus-list-of-unread-articles gnus-newsgroup-name)
12515               articles)))
12516       ;; Mark the inserted articles as selected so that the information
12517       ;; of the marks having been changed by a user may be updated when
12518       ;; exiting this group.  See `gnus-summary-update-info'.
12519       (dolist (art articles)
12520         (setq gnus-newsgroup-unselected (delq art gnus-newsgroup-unselected))))
12521     ;; Let the Gnus agent mark articles as read.
12522     (when gnus-agent
12523       (gnus-agent-get-undownloaded-list))
12524     ;; Remove list identifiers from subject
12525     (when gnus-list-identifiers
12526       (gnus-summary-remove-list-identifiers))
12527     ;; First and last article in this newsgroup.
12528     (when gnus-newsgroup-headers
12529       (setq gnus-newsgroup-begin
12530             (mail-header-number (car gnus-newsgroup-headers))
12531             gnus-newsgroup-end
12532             (mail-header-number
12533              (gnus-last-element gnus-newsgroup-headers))))
12534     (when gnus-use-scoring
12535       (gnus-possibly-score-headers))))
12536
12537 (defun gnus-summary-insert-old-articles (&optional all)
12538   "Insert all old articles in this group.
12539 If ALL is non-nil, already read articles become readable.
12540 If ALL is a number, fetch this number of articles."
12541   (interactive "P")
12542   (prog1
12543       (let ((old (sort (mapcar 'car gnus-newsgroup-data) '<))
12544             older len)
12545         (setq older
12546               ;; Some nntp servers lie about their active range.  When
12547               ;; this happens, the active range can be in the millions.
12548               ;; Use a compressed range to avoid creating a huge list.
12549               (gnus-range-difference (list gnus-newsgroup-active) old))
12550         (setq len (gnus-range-length older))
12551         (cond
12552          ((null older) nil)
12553          ((numberp all)
12554           (if (< all len)
12555               (let ((older-range (nreverse older)))
12556                 (setq older nil)
12557
12558                 (while (> all 0)
12559                   (let* ((r (pop older-range))
12560                          (min (if (numberp r) r (car r)))
12561                          (max (if (numberp r) r (cdr r))))
12562                     (while (and (<= min max)
12563                                 (> all 0))
12564                       (push max older)
12565                       (setq all (1- all)
12566                             max (1- max))))))
12567             (setq older (gnus-uncompress-range older))))
12568          (all
12569           (setq older (gnus-uncompress-range older)))
12570          (t
12571           (when (and (numberp gnus-large-newsgroup)
12572                    (> len gnus-large-newsgroup))
12573               (let* ((cursor-in-echo-area nil)
12574                      (initial (gnus-parameter-large-newsgroup-initial
12575                                gnus-newsgroup-name))
12576                      (input
12577                       (read-string
12578                        (format
12579                         "How many articles from %s (%s %d): "
12580                         (gnus-group-decoded-name gnus-newsgroup-name)
12581                         (if initial "max" "default")
12582                         len)
12583                        (if initial
12584                            (cons (number-to-string initial)
12585                                  0)))))
12586                 (unless (string-match "^[ \t]*$" input)
12587                   (setq all (string-to-number input))
12588                   (if (< all len)
12589                       (let ((older-range (nreverse older)))
12590                         (setq older nil)
12591
12592                         (while (> all 0)
12593                           (let* ((r (pop older-range))
12594                                  (min (if (numberp r) r (car r)))
12595                                  (max (if (numberp r) r (cdr r))))
12596                             (while (and (<= min max)
12597                                         (> all 0))
12598                               (push max older)
12599                               (setq all (1- all)
12600                                     max (1- max))))))))))
12601           (setq older (gnus-uncompress-range older))))
12602         (if (not older)
12603             (message "No old news.")
12604           (gnus-summary-insert-articles older)
12605           (gnus-summary-limit (gnus-sorted-nunion old older))))
12606     (gnus-summary-position-point)))
12607
12608 (defun gnus-summary-insert-new-articles ()
12609   "Insert all new articles in this group."
12610   (interactive)
12611   (prog1
12612       (let ((old (sort (mapcar 'car gnus-newsgroup-data) '<))
12613             (old-active gnus-newsgroup-active)
12614             (nnmail-fetched-sources (list t))
12615             i new)
12616         (setq gnus-newsgroup-active
12617               (gnus-activate-group gnus-newsgroup-name 'scan))
12618         (setq i (cdr gnus-newsgroup-active))
12619         (while (> i (cdr old-active))
12620           (push i new)
12621           (decf i))
12622         (if (not new)
12623             (message "No gnus is bad news")
12624           (gnus-summary-insert-articles new)
12625           (setq gnus-newsgroup-unreads
12626                 (gnus-sorted-nunion gnus-newsgroup-unreads new))
12627           (gnus-summary-limit (gnus-sorted-nunion old new))))
12628     (gnus-summary-position-point)))
12629
12630 ;;; Bookmark support for Gnus.
12631 (declare-function bookmark-make-record-default
12632                   "bookmark" (&optional no-file no-context posn))
12633 (declare-function bookmark-prop-get "bookmark" (bookmark prop))
12634 (declare-function bookmark-default-handler "bookmark" (bmk))
12635 (declare-function bookmark-get-bookmark-record "bookmark" (bmk))
12636 (defvar bookmark-yank-point)
12637 (defvar bookmark-current-buffer)
12638
12639 (defun gnus-summary-bookmark-make-record ()
12640   "Make a bookmark entry for a Gnus summary buffer."
12641   (let (pos buf)
12642     (unless (and (derived-mode-p 'gnus-summary-mode) gnus-article-current)
12643       (save-restriction              ; FIXME is it necessary to widen?
12644         (widen) (setq pos (point))) ; Set position in gnus-article buffer.
12645       (setq buf "art") ; We are recording bookmark from article buffer.
12646       (setq bookmark-yank-point (point))
12647       (setq bookmark-current-buffer (current-buffer))
12648       (gnus-article-show-summary))      ; Go back in summary buffer.
12649     ;; We are now recording bookmark from summary buffer.
12650     (unless buf (setq buf "sum"))
12651     (let* ((subject (elt (gnus-summary-article-header) 1))
12652            (grp     (car gnus-article-current))
12653            (art     (cdr gnus-article-current))
12654            (head    (gnus-summary-article-header art))
12655            (id      (mail-header-id head)))
12656       `(,subject
12657         ,@(condition-case nil
12658               (bookmark-make-record-default 'no-file 'no-context pos)
12659             (wrong-number-of-arguments
12660              (bookmark-make-record-default 'point-only)))
12661         (location . ,(format "Gnus-%s %s:%d:%s" buf grp art id))
12662         (group . ,grp) (article . ,art)
12663         (message-id . ,id) (handler . gnus-summary-bookmark-jump)))))
12664
12665 ;;;###autoload
12666 (defun gnus-summary-bookmark-jump (bookmark)
12667   "Handler function for record returned by `gnus-summary-bookmark-make-record'.
12668 BOOKMARK is a bookmark name or a bookmark record."
12669   (let ((group    (bookmark-prop-get bookmark 'group))
12670         (article  (bookmark-prop-get bookmark 'article))
12671         (id       (bookmark-prop-get bookmark 'message-id))
12672         (buf      (car (split-string (bookmark-prop-get bookmark 'location)))))
12673     (gnus-fetch-group group (list article))
12674     (gnus-summary-insert-cached-articles)
12675     (gnus-summary-goto-article id nil 'force)
12676     ;; FIXME we have to wait article buffer is ready (only large buffer)
12677     ;; Is there a better solution to know that?
12678     ;; If we don't wait `bookmark-default-handler' will have no chance
12679     ;; to set position. However there is no error, just wrong pos.
12680     (sit-for 1)
12681     (when (string= buf "Gnus-art")
12682       (other-window 1))
12683     (bookmark-default-handler
12684      `(""
12685        (buffer . ,(current-buffer))
12686        . ,(bookmark-get-bookmark-record bookmark)))))
12687
12688 (gnus-summary-make-all-marking-commands)
12689
12690 (gnus-ems-redefine)
12691
12692 (provide 'gnus-sum)
12693
12694 (run-hooks 'gnus-sum-load-hook)
12695
12696 ;; Local Variables:
12697 ;; coding: iso-8859-1
12698 ;; End:
12699
12700 ;; arch-tag: 17c6748f-6d00-4d36-bf01-835c42f31235
12701 ;;; gnus-sum.el ends here