lisp/gnus-sum.el

   1 ;;; gnus-sum.el --- summary mode commands for Gnus
   2
   3 ;; Copyright (C) 1996-2011 Free Software Foundation, Inc.
   4
   5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   6 ;; Keywords: news
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;;; Code:
  26
  27 ;; For Emacs <22.2 and XEmacs.
  28 (eval-and-compile
  29   (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
  30 (eval-when-compile
  31   (require 'cl))
  32 (eval-when-compile
  33   (when (featurep 'xemacs)
  34     (require 'easy-mmode))) ; for `define-minor-mode'
  35
  36 (defvar tool-bar-mode)
  37 (defvar gnus-tmp-header)
  38
  39 (require 'gnus)
  40 (require 'gnus-group)
  41 (require 'gnus-spec)
  42 (require 'gnus-range)
  43 (require 'gnus-int)
  44 (require 'gnus-undo)
  45 (require 'gnus-util)
  46 (require 'gmm-utils)
  47 (require 'mm-decode)
  48 (require 'nnoo)
  49
  50 (autoload 'gnus-summary-limit-include-cached "gnus-cache" nil t)
  51 (autoload 'gnus-cache-write-active "gnus-cache")
  52 (autoload 'gnus-mailing-list-insinuate "gnus-ml" nil t)
  53 (autoload 'turn-on-gnus-mailing-list-mode "gnus-ml" nil t)
  54 (autoload 'gnus-pick-line-number "gnus-salt" nil t)
  55 (autoload 'mm-uu-dissect "mm-uu")
  56 (autoload 'gnus-article-outlook-deuglify-article "deuglify"
  57   "Deuglify broken Outlook (Express) articles and redisplay."
  58   t)
  59 (autoload 'gnus-article-outlook-unwrap-lines "deuglify" nil t)
  60 (autoload 'gnus-article-outlook-repair-attribution "deuglify" nil t)
  61 (autoload 'gnus-article-outlook-rearrange-citation "deuglify" nil t)
  62 (autoload 'nnir-article-rsv "nnir" nil nil 'macro)
  63 (autoload 'nnir-article-group "nnir" nil nil 'macro)
  64
  65 (defcustom gnus-kill-summary-on-exit t
  66   "*If non-nil, kill the summary buffer when you exit from it.
  67 If nil, the summary will become a \"*Dead Summary*\" buffer, and
  68 it will be killed sometime later."
  69   :group 'gnus-summary-exit
  70   :type 'boolean)
  71
  72 (defcustom gnus-summary-next-group-on-exit t
  73   "If non-nil, go to the next unread newsgroup on summary exit.
  74 See `gnus-group-goto-unread'."
  75   :link '(custom-manual "(gnus)Group Maneuvering")
  76   :group 'gnus-summary-exit
  77   :version "23.1" ;; No Gnus
  78   :type 'boolean)
  79
  80 (defcustom gnus-summary-stop-at-end-of-message nil
  81   "If non-nil, don't select the next message when using `SPC'."
  82   :link '(custom-manual "(gnus)Group Maneuvering")
  83   :group 'gnus-summary-maneuvering
  84   :version "24.1"
  85   :type 'boolean)
  86
  87 (defcustom gnus-fetch-old-headers nil
  88   "*Non-nil means that Gnus will try to build threads by grabbing old headers.
  89 If an unread article in the group refers to an older, already
  90 read (or just marked as read) article, the old article will not
  91 normally be displayed in the Summary buffer.  If this variable is
  92 t, Gnus will attempt to grab the headers to the old articles, and
  93 thereby build complete threads.  If it has the value `some', all
  94 old headers will be fetched but only enough headers to connect
  95 otherwise loose threads will be displayed.  This variable can
  96 also be a number.  In that case, no more than that number of old
  97 headers will be fetched.  If it has the value `invisible', all
  98 old headers will be fetched, but none will be displayed.
  99
 100 The server has to support NOV for any of this to work.
 101
 102 This feature can seriously impact performance it ignores all
 103 locally cached header entries.  Setting it to t for groups for a
 104 server that doesn't expire articles (such as news.gmane.org),
 105 leads to very slow summary generation."
 106   :group 'gnus-thread
 107   :type '(choice (const :tag "off" nil)
 108                  (const :tag "on" t)
 109                  (const some)
 110                  (const invisible)
 111                  number
 112                  (sexp :menu-tag "other" t)))
 113
 114 (defcustom gnus-refer-thread-limit 500
 115   "*The number of old headers to fetch when doing \\<gnus-summary-mode-map>\\[gnus-summary-refer-thread].
 116 If t, fetch all the available old headers."
 117   :group 'gnus-thread
 118   :type '(choice number
 119                  (sexp :menu-tag "other" t)))
 120
 121 (defcustom gnus-summary-make-false-root 'adopt
 122   "*nil means that Gnus won't gather loose threads.
 123 If the root of a thread has expired or been read in a previous
 124 session, the information necessary to build a complete thread has been
 125 lost.  Instead of having many small sub-threads from this original thread
 126 scattered all over the summary buffer, Gnus can gather them.
 127
 128 If non-nil, Gnus will try to gather all loose sub-threads from an
 129 original thread into one large thread.
 130
 131 If this variable is non-nil, it should be one of `none', `adopt',
 132 `dummy' or `empty'.
 133
 134 If this variable is `none', Gnus will not make a false root, but just
 135 present the sub-threads after another.
 136 If this variable is `dummy', Gnus will create a dummy root that will
 137 have all the sub-threads as children.
 138 If this variable is `adopt', Gnus will make one of the \"children\"
 139 the parent and mark all the step-children as such.
 140 If this variable is `empty', the \"children\" are printed with empty
 141 subject fields.  (Or rather, they will be printed with a string
 142 given by the `gnus-summary-same-subject' variable.)"
 143   :group 'gnus-thread
 144   :type '(choice (const :tag "off" nil)
 145                  (const none)
 146                  (const dummy)
 147                  (const adopt)
 148                  (const empty)))
 149
 150 (defcustom gnus-summary-make-false-root-always nil
 151   "Always make a false dummy root."
 152   :version "22.1"
 153   :group 'gnus-thread
 154   :type 'boolean)
 155
 156 (defcustom gnus-summary-gather-exclude-subject "^ *$\\|^(none)$"
 157   "*A regexp to match subjects to be excluded from loose thread gathering.
 158 As loose thread gathering is done on subjects only, that means that
 159 there can be many false gatherings performed.  By rooting out certain
 160 common subjects, gathering might become saner."
 161   :group 'gnus-thread
 162   :type 'regexp)
 163
 164 (defcustom gnus-summary-gather-subject-limit nil
 165   "*Maximum length of subject comparisons when gathering loose threads.
 166 Use nil to compare full subjects.  Setting this variable to a low
 167 number will help gather threads that have been corrupted by
 168 newsreaders chopping off subject lines, but it might also mean that
 169 unrelated articles that have subject that happen to begin with the
 170 same few characters will be incorrectly gathered.
 171
 172 If this variable is `fuzzy', Gnus will use a fuzzy algorithm when
 173 comparing subjects."
 174   :group 'gnus-thread
 175   :type '(choice (const :tag "off" nil)
 176                  (const fuzzy)
 177                  (sexp :menu-tag "on" t)))
 178
 179 (defcustom gnus-simplify-subject-functions nil
 180   "List of functions taking a string argument that simplify subjects.
 181 The functions are applied recursively.
 182
 183 Useful functions to put in this list include:
 184 `gnus-simplify-subject-re', `gnus-simplify-subject-fuzzy',
 185 `gnus-simplify-whitespace', and `gnus-simplify-all-whitespace'."
 186   :group 'gnus-thread
 187   :type '(repeat function))
 188
 189 (defcustom gnus-simplify-ignored-prefixes nil
 190   "*Remove matches for this regexp from subject lines when simplifying fuzzily."
 191   :group 'gnus-thread
 192   :type '(choice (const :tag "off" nil)
 193                  regexp))
 194
 195 (defcustom gnus-build-sparse-threads nil
 196   "*If non-nil, fill in the gaps in threads.
 197 If `some', only fill in the gaps that are needed to tie loose threads
 198 together.  If `more', fill in all leaf nodes that Gnus can find.  If
 199 non-nil and non-`some', fill in all gaps that Gnus manages to guess."
 200   :group 'gnus-thread
 201   :type '(choice (const :tag "off" nil)
 202                  (const some)
 203                  (const more)
 204                  (sexp :menu-tag "all" t)))
 205
 206 (defcustom gnus-summary-thread-gathering-function
 207   'gnus-gather-threads-by-subject
 208   "*Function used for gathering loose threads.
 209 There are two pre-defined functions: `gnus-gather-threads-by-subject',
 210 which only takes Subjects into consideration; and
 211 `gnus-gather-threads-by-references', which compared the References
 212 headers of the articles to find matches."
 213   :group 'gnus-thread
 214   :type '(radio (function-item gnus-gather-threads-by-subject)
 215                 (function-item gnus-gather-threads-by-references)
 216                 (function :tag "other")))
 217
 218 (defcustom gnus-summary-same-subject ""
 219   "*String indicating that the current article has the same subject as the previous.
 220 This variable will only be used if the value of
 221 `gnus-summary-make-false-root' is `empty'."
 222   :group 'gnus-summary-format
 223   :type 'string)
 224
 225 (defcustom gnus-summary-goto-unread nil
 226   "*If t, many commands will go to the next unread article.
 227 This applies to marking commands as well as other commands that
 228 \"naturally\" select the next article, like, for instance, `SPC' at
 229 the end of an article.
 230
 231 If nil, the marking commands do NOT go to the next unread article
 232 \(they go to the next article instead).  If `never', commands that
 233 usually go to the next unread article, will go to the next article,
 234 whether it is read or not."
 235   :version "24.1"
 236   :group 'gnus-summary-marks
 237   :link '(custom-manual "(gnus)Setting Marks")
 238   :type '(choice (const :tag "off" nil)
 239                  (const never)
 240                  (sexp :menu-tag "on" t)))
 241
 242 (defcustom gnus-summary-default-score 0
 243   "*Default article score level.
 244 All scores generated by the score files will be added to this score.
 245 If this variable is nil, scoring will be disabled."
 246   :group 'gnus-score-default
 247   :type '(choice (const :tag "disable")
 248                  integer))
 249
 250 (defcustom gnus-summary-default-high-score 0
 251   "*Default threshold for a high scored article.
 252 An article will be highlighted as high scored if its score is greater
 253 than this score."
 254   :version "22.1"
 255   :group 'gnus-score-default
 256   :type 'integer)
 257
 258 (defcustom gnus-summary-default-low-score 0
 259   "*Default threshold for a low scored article.
 260 An article will be highlighted as low scored if its score is smaller
 261 than this score."
 262   :version "22.1"
 263   :group 'gnus-score-default
 264   :type 'integer)
 265
 266 (defcustom gnus-summary-zcore-fuzz 0
 267   "*Fuzziness factor for the zcore in the summary buffer.
 268 Articles with scores closer than this to `gnus-summary-default-score'
 269 will not be marked."
 270   :group 'gnus-summary-format
 271   :type 'integer)
 272
 273 (defcustom gnus-simplify-subject-fuzzy-regexp nil
 274   "*Strings to be removed when doing fuzzy matches.
 275 This can either be a regular expression or list of regular expressions
 276 that will be removed from subject strings if fuzzy subject
 277 simplification is selected."
 278   :group 'gnus-thread
 279   :type '(repeat regexp))
 280
 281 (defcustom gnus-show-threads t
 282   "*If non-nil, display threads in summary mode."
 283   :group 'gnus-thread
 284   :type 'boolean)
 285
 286 (defcustom gnus-thread-hide-subtree nil
 287   "*If non-nil, hide all threads initially.
 288 This can be a predicate specifier which says which threads to hide.
 289 If threads are hidden, you have to run the command
 290 `gnus-summary-show-thread' by hand or select an article."
 291   :group 'gnus-thread
 292   :type '(radio (sexp :format "Non-nil\n"
 293                       :match (lambda (widget value)
 294                                (not (or (consp value) (functionp value))))
 295                       :value t)
 296                 (const nil)
 297                 (sexp :tag "Predicate specifier")))
 298
 299 (defcustom gnus-thread-hide-killed t
 300   "*If non-nil, hide killed threads automatically."
 301   :group 'gnus-thread
 302   :type 'boolean)
 303
 304 (defcustom gnus-thread-ignore-subject t
 305   "*If non-nil, which is the default, ignore subjects and do all threading based on the Reference header.
 306 If nil, articles that have different subjects from their parents will
 307 start separate threads."
 308   :group 'gnus-thread
 309   :type 'boolean)
 310
 311 (defcustom gnus-thread-operation-ignore-subject t
 312   "*If non-nil, subjects will be ignored when doing thread commands.
 313 This affects commands like `gnus-summary-kill-thread' and
 314 `gnus-summary-lower-thread'.
 315
 316 If this variable is nil, articles in the same thread with different
 317 subjects will not be included in the operation in question.  If this
 318 variable is `fuzzy', only articles that have subjects that are fuzzily
 319 equal will be included."
 320   :group 'gnus-thread
 321   :type '(choice (const :tag "off" nil)
 322                  (const fuzzy)
 323                  (sexp :tag "on" t)))
 324
 325 (defcustom gnus-thread-indent-level 4
 326   "*Number that says how much each sub-thread should be indented."
 327   :group 'gnus-thread
 328   :type 'integer)
 329
 330 (defcustom gnus-auto-extend-newsgroup t
 331   "*If non-nil, extend newsgroup forward and backward when requested."
 332   :group 'gnus-summary-choose
 333   :type 'boolean)
 334
 335 (defcustom gnus-auto-select-first t
 336   "If non-nil, select an article on group entry.
 337 An article is selected automatically when entering a group
 338 e.g. with \\<gnus-group-mode-map>\\[gnus-group-read-group], or via `gnus-summary-next-page' or
 339 `gnus-summary-catchup-and-goto-next-group'.
 340
 341 Which article is selected is controlled by the variable
 342 `gnus-auto-select-subject'.
 343
 344 If you want to prevent automatic selection of articles in some
 345 newsgroups, set the variable to nil in `gnus-select-group-hook'."
 346   ;; Commands include...
 347   ;; \\<gnus-group-mode-map>\\[gnus-group-read-group]
 348   ;; \\<gnus-summary-mode-map>\\[gnus-summary-next-page]
 349   ;; \\<gnus-summary-mode-map>\\[gnus-summary-catchup-and-goto-next-group]
 350   :group 'gnus-group-select
 351   :type '(choice (const :tag "none" nil)
 352                  (sexp :menu-tag "first" t)))
 353
 354 (defcustom gnus-auto-select-subject 'unseen-or-unread
 355   "*Says what subject to place under point when entering a group.
 356
 357 This variable can either be the symbols `first' (place point on the
 358 first subject), `unread' (place point on the subject line of the first
 359 unread article), `best' (place point on the subject line of the
 360 higest-scored article), `unseen' (place point on the subject line of
 361 the first unseen article), `unseen-or-unread' (place point on the subject
 362 line of the first unseen article or, if all articles have been seen, on the
 363 subject line of the first unread article), or a function to be called to
 364 place point on some subject line."
 365   :version "24.1"
 366   :group 'gnus-group-select
 367   :type '(choice (const best)
 368                  (const unread)
 369                  (const first)
 370                  (const unseen)
 371                  (const unseen-or-unread)))
 372
 373 (defcustom gnus-auto-select-next t
 374   "*If non-nil, offer to go to the next group from the end of the previous.
 375 If the value is t and the next newsgroup is empty, Gnus will exit
 376 summary mode and go back to group mode.  If the value is neither nil
 377 nor t, Gnus will select the following unread newsgroup.  In
 378 particular, if the value is the symbol `quietly', the next unread
 379 newsgroup will be selected without any confirmation, and if it is
 380 `almost-quietly', the next group will be selected without any
 381 confirmation if you are located on the last article in the group.
 382 Finally, if this variable is `slightly-quietly', the `\\<gnus-summary-mode-map>\\[gnus-summary-catchup-and-goto-next-group]' command
 383 will go to the next group without confirmation."
 384   :group 'gnus-summary-maneuvering
 385   :type '(choice (const :tag "off" nil)
 386                  (const quietly)
 387                  (const almost-quietly)
 388                  (const slightly-quietly)
 389                  (sexp :menu-tag "on" t)))
 390
 391 (defcustom gnus-auto-select-same nil
 392   "*If non-nil, select the next article with the same subject.
 393 If there are no more articles with the same subject, go to
 394 the first unread article."
 395   :group 'gnus-summary-maneuvering
 396   :type 'boolean)
 397
 398 (defcustom gnus-auto-select-on-ephemeral-exit 'next-noselect
 399   "What article should be selected after exiting an ephemeral group.
 400 Valid values include:
 401
 402 `next'
 403   Select the next article.
 404 `next-unread'
 405   Select the next unread article.
 406 `next-noselect'
 407   Move the cursor to the next article.  This is the default.
 408 `next-unread-noselect'
 409   Move the cursor to the next unread article.
 410
 411 If it has any other value or there is no next (unread) article, the
 412 article selected before entering to the ephemeral group will appear."
 413   :version "23.1" ;; No Gnus
 414   :group 'gnus-summary-maneuvering
 415   :type '(choice :format "%{%t%}:\n %[Value Menu%] %v"
 416                  (const next) (const next-unread)
 417                  (const next-noselect) (const next-unread-noselect)
 418                  (sexp :tag "other" :value nil)))
 419
 420 (defcustom gnus-auto-goto-ignores 'unfetched
 421   "*Says how to handle unfetched articles when maneuvering.
 422
 423 This variable can either be the symbols nil (maneuver to any
 424 article), `undownloaded' (maneuvering while unplugged ignores articles
 425 that have not been fetched), `always-undownloaded' (maneuvering always
 426 ignores articles that have not been fetched), `unfetched' (maneuvering
 427 ignores articles whose headers have not been fetched).
 428
 429 NOTE: The list of unfetched articles will always be nil when plugged
 430 and, when unplugged, a subset of the undownloaded article list."
 431   :version "22.1"
 432   :group 'gnus-summary-maneuvering
 433   :type '(choice (const :tag "None" nil)
 434                  (const :tag "Undownloaded when unplugged" undownloaded)
 435                  (const :tag "Undownloaded" always-undownloaded)
 436                  (const :tag "Unfetched" unfetched)))
 437
 438 (defcustom gnus-summary-check-current nil
 439   "*If non-nil, consider the current article when moving.
 440 The \"unread\" movement commands will stay on the same line if the
 441 current article is unread."
 442   :group 'gnus-summary-maneuvering
 443   :type 'boolean)
 444
 445 (defcustom gnus-auto-center-summary 2
 446   "*If non-nil, always center the current summary buffer.
 447 In particular, if `vertical' do only vertical recentering.  If non-nil
 448 and non-`vertical', do both horizontal and vertical recentering."
 449   :group 'gnus-summary-maneuvering
 450   :type '(choice (const :tag "none" nil)
 451                  (const vertical)
 452                  (integer :tag "height")
 453                  (sexp :menu-tag "both" t)))
 454
 455 (defcustom gnus-auto-center-group t
 456   "If non-nil, always center the group buffer."
 457   :group 'gnus-summary-maneuvering
 458   :type 'boolean)
 459
 460 (defcustom gnus-show-all-headers nil
 461   "*If non-nil, don't hide any headers."
 462   :group 'gnus-article-hiding
 463   :group 'gnus-article-headers
 464   :type 'boolean)
 465
 466 (defcustom gnus-summary-ignore-duplicates nil
 467   "*If non-nil, ignore articles with identical Message-ID headers."
 468   :group 'gnus-summary
 469   :type 'boolean)
 470
 471 (defcustom gnus-single-article-buffer nil
 472   "*If non-nil, display all articles in the same buffer.
 473 If nil, each group will get its own article buffer."
 474   :version "24.1"
 475   :group 'gnus-article-various
 476   :type 'boolean)
 477
 478 (defcustom gnus-widen-article-window nil
 479   "If non-nil, selecting the article buffer will display only the article buffer."
 480   :version "24.1"
 481   :group 'gnus-article-various
 482   :type 'boolean)
 483
 484 (defcustom gnus-break-pages t
 485   "*If non-nil, do page breaking on articles.
 486 The page delimiter is specified by the `gnus-page-delimiter'
 487 variable."
 488   :group 'gnus-article-various
 489   :type 'boolean)
 490
 491 (defcustom gnus-move-split-methods nil
 492   "*Variable used to suggest where articles are to be moved to.
 493 It uses the same syntax as the `gnus-split-methods' variable.
 494 However, whereas `gnus-split-methods' specifies file names as targets,
 495 this variable specifies group names."
 496   :group 'gnus-summary-mail
 497   :type '(repeat (choice (list :value (fun) function)
 498                          (cons :value ("" "") regexp (repeat string))
 499                          (sexp :value nil))))
 500
 501 (defcustom gnus-move-group-prefix-function 'gnus-group-real-prefix
 502   "Function used to compute default prefix for article move/copy/etc prompts.
 503 The function should take one argument, a group name, and return a
 504 string with the suggested prefix."
 505   :group 'gnus-summary-mail
 506   :type 'function)
 507
 508 ;; FIXME: Although the custom type is `character' for the following variables,
 509 ;; using multibyte characters (Latin-1, UTF-8) doesn't work.  -- rs
 510
 511 (defcustom gnus-unread-mark ?           ;Whitespace
 512   "*Mark used for unread articles."
 513   :group 'gnus-summary-marks
 514   :type 'character)
 515
 516 (defcustom gnus-ticked-mark ?!
 517   "*Mark used for ticked articles."
 518   :group 'gnus-summary-marks
 519   :type 'character)
 520
 521 (defcustom gnus-dormant-mark ??
 522   "*Mark used for dormant articles."
 523   :group 'gnus-summary-marks
 524   :type 'character)
 525
 526 (defcustom gnus-del-mark ?r
 527   "*Mark used for del'd articles."
 528   :group 'gnus-summary-marks
 529   :type 'character)
 530
 531 (defcustom gnus-read-mark ?R
 532   "*Mark used for read articles."
 533   :group 'gnus-summary-marks
 534   :type 'character)
 535
 536 (defcustom gnus-expirable-mark ?E
 537   "*Mark used for expirable articles."
 538   :group 'gnus-summary-marks
 539   :type 'character)
 540
 541 (defcustom gnus-killed-mark ?K
 542   "*Mark used for killed articles."
 543   :group 'gnus-summary-marks
 544   :type 'character)
 545
 546 (defcustom gnus-spam-mark ?$
 547   "*Mark used for spam articles."
 548   :version "22.1"
 549   :group 'gnus-summary-marks
 550   :type 'character)
 551
 552 (defcustom gnus-kill-file-mark ?X
 553   "*Mark used for articles killed by kill files."
 554   :group 'gnus-summary-marks
 555   :type 'character)
 556
 557 (defcustom gnus-low-score-mark ?Y
 558   "*Mark used for articles with a low score."
 559   :group 'gnus-summary-marks
 560   :type 'character)
 561
 562 (defcustom gnus-catchup-mark ?C
 563   "*Mark used for articles that are caught up."
 564   :group 'gnus-summary-marks
 565   :type 'character)
 566
 567 (defcustom gnus-replied-mark ?A
 568   "*Mark used for articles that have been replied to."
 569   :group 'gnus-summary-marks
 570   :type 'character)
 571
 572 (defcustom gnus-forwarded-mark ?F
 573   "*Mark used for articles that have been forwarded."
 574   :version "22.1"
 575   :group 'gnus-summary-marks
 576   :type 'character)
 577
 578 (defcustom gnus-recent-mark ?N
 579   "*Mark used for articles that are recent."
 580   :version "22.1"
 581   :group 'gnus-summary-marks
 582   :type 'character)
 583
 584 (defcustom gnus-cached-mark ?*
 585   "*Mark used for articles that are in the cache."
 586   :group 'gnus-summary-marks
 587   :type 'character)
 588
 589 (defcustom gnus-saved-mark ?S
 590   "*Mark used for articles that have been saved."
 591   :group 'gnus-summary-marks
 592   :type 'character)
 593
 594 (defcustom gnus-unseen-mark ?.
 595   "*Mark used for articles that haven't been seen."
 596   :version "22.1"
 597   :group 'gnus-summary-marks
 598   :type 'character)
 599
 600 (defcustom gnus-no-mark ?               ;Whitespace
 601   "*Mark used for articles that have no other secondary mark."
 602   :version "22.1"
 603   :group 'gnus-summary-marks
 604   :type 'character)
 605
 606 (defcustom gnus-ancient-mark ?O
 607   "*Mark used for ancient articles."
 608   :group 'gnus-summary-marks
 609   :type 'character)
 610
 611 (defcustom gnus-sparse-mark ?Q
 612   "*Mark used for sparsely reffed articles."
 613   :group 'gnus-summary-marks
 614   :type 'character)
 615
 616 (defcustom gnus-canceled-mark ?G
 617   "*Mark used for canceled articles."
 618   :group 'gnus-summary-marks
 619   :type 'character)
 620
 621 (defcustom gnus-duplicate-mark ?M
 622   "*Mark used for duplicate articles."
 623   :group 'gnus-summary-marks
 624   :type 'character)
 625
 626 (defcustom gnus-undownloaded-mark ?-
 627   "*Mark used for articles that weren't downloaded."
 628   :version "22.1"
 629   :group 'gnus-summary-marks
 630   :type 'character)
 631
 632 (defcustom gnus-downloaded-mark ?+
 633   "*Mark used for articles that were downloaded."
 634   :group 'gnus-summary-marks
 635   :type 'character)
 636
 637 (defcustom gnus-downloadable-mark ?%
 638   "*Mark used for articles that are to be downloaded."
 639   :group 'gnus-summary-marks
 640   :type 'character)
 641
 642 (defcustom gnus-unsendable-mark ?=
 643   "*Mark used for articles that won't be sent."
 644   :group 'gnus-summary-marks
 645   :type 'character)
 646
 647 (defcustom gnus-score-over-mark ?+
 648   "*Score mark used for articles with high scores."
 649   :group 'gnus-summary-marks
 650   :type 'character)
 651
 652 (defcustom gnus-score-below-mark ?-
 653   "*Score mark used for articles with low scores."
 654   :group 'gnus-summary-marks
 655   :type 'character)
 656
 657 (defcustom gnus-empty-thread-mark ?     ;Whitespace
 658   "*There is no thread under the article."
 659   :group 'gnus-summary-marks
 660   :type 'character)
 661
 662 (defcustom gnus-not-empty-thread-mark ?=
 663   "*There is a thread under the article."
 664   :group 'gnus-summary-marks
 665   :type 'character)
 666
 667 (defcustom gnus-view-pseudo-asynchronously nil
 668   "*If non-nil, Gnus will view pseudo-articles asynchronously."
 669   :group 'gnus-extract-view
 670   :type 'boolean)
 671
 672 (defcustom gnus-auto-expirable-marks
 673   (list gnus-killed-mark gnus-del-mark gnus-catchup-mark
 674         gnus-low-score-mark gnus-ancient-mark gnus-read-mark
 675         gnus-duplicate-mark)
 676   "*The list of marks converted into expiration if a group is auto-expirable."
 677   :version "24.1"
 678   :group 'gnus-summary
 679   :type '(repeat character))
 680
 681 (defcustom gnus-inhibit-user-auto-expire t
 682   "*If non-nil, user marking commands will not mark an article as expirable, even if the group has auto-expire turned on."
 683   :version "21.1"
 684   :group 'gnus-summary
 685   :type 'boolean)
 686
 687 (defcustom gnus-mark-copied-or-moved-articles-as-expirable nil
 688   "If non-nil, mark articles copied or moved to auto-expire group as expirable.
 689 If nil, the expirable marks will be unchanged except that the marks
 690 will be removed when copying or moving articles to a group that has
 691 not turned auto-expire on.  If non-nil, articles that have been read
 692 will be marked as expirable when being copied or moved to a group in
 693 which auto-expire is turned on."
 694   :version "23.2"
 695   :type 'boolean
 696   :group 'gnus-summary-marks)
 697
 698 (defcustom gnus-view-pseudos nil
 699   "*If `automatic', pseudo-articles will be viewed automatically.
 700 If `not-confirm', pseudos will be viewed automatically, and the user
 701 will not be asked to confirm the command."
 702   :group 'gnus-extract-view
 703   :type '(choice (const :tag "off" nil)
 704                  (const automatic)
 705                  (const not-confirm)))
 706
 707 (defcustom gnus-view-pseudos-separately t
 708   "*If non-nil, one pseudo-article will be created for each file to be viewed.
 709 If nil, all files that use the same viewing command will be given as a
 710 list of parameters to that command."
 711   :group 'gnus-extract-view
 712   :type 'boolean)
 713
 714 (defcustom gnus-insert-pseudo-articles t
 715   "*If non-nil, insert pseudo-articles when decoding articles."
 716   :group 'gnus-extract-view
 717   :type 'boolean)
 718
 719 (defcustom gnus-summary-dummy-line-format
 720   "   %(:                             :%) %S\n"
 721   "*The format specification for the dummy roots in the summary buffer.
 722 It works along the same lines as a normal formatting string,
 723 with some simple extensions.
 724
 725 %S  The subject
 726
 727 General format specifiers can also be used.
 728 See `(gnus)Formatting Variables'."
 729   :link '(custom-manual "(gnus)Formatting Variables")
 730   :group 'gnus-threading
 731   :type 'string)
 732
 733 (defcustom gnus-summary-mode-line-format "Gnus: %g [%A] %Z"
 734   "*The format specification for the summary mode line.
 735 It works along the same lines as a normal formatting string,
 736 with some simple extensions:
 737
 738 %G  Group name
 739 %p  Unprefixed group name
 740 %A  Current article number
 741 %z  Current article score
 742 %V  Gnus version
 743 %U  Number of unread articles in the group
 744 %e  Number of unselected articles in the group
 745 %Z  A string with unread/unselected article counts
 746 %g  Shortish group name
 747 %S  Subject of the current article
 748 %u  User-defined spec
 749 %s  Current score file name
 750 %d  Number of dormant articles
 751 %r  Number of articles that have been marked as read in this session
 752 %E  Number of articles expunged by the score files"
 753   :group 'gnus-summary-format
 754   :type 'string)
 755
 756 (defcustom gnus-list-identifiers nil
 757   "Regexp that matches list identifiers to be removed from subject.
 758 This can also be a list of regexps."
 759   :version "21.1"
 760   :group 'gnus-summary-format
 761   :group 'gnus-article-hiding
 762   :type '(choice (const :tag "none" nil)
 763                  (regexp :value ".*")
 764                  (repeat :value (".*") regexp)))
 765
 766 (defcustom gnus-summary-mark-below 0
 767   "*Mark all articles with a score below this variable as read.
 768 This variable is local to each summary buffer and usually set by the
 769 score file."
 770   :group 'gnus-score-default
 771   :type 'integer)
 772
 773 (defun gnus-widget-reversible-match (widget value)
 774   "Ignoring WIDGET, convert VALUE to internal form.
 775 VALUE should have the form `FOO' or `(not FOO)', where FOO is an symbol."
 776   ;; (debug value)
 777   (or (symbolp value)
 778       (and (listp value)
 779            (eq (length value) 2)
 780            (eq (nth 0 value) 'not)
 781            (symbolp (nth 1 value)))))
 782
 783 (defun gnus-widget-reversible-to-internal (widget value)
 784   "Ignoring WIDGET, convert VALUE to internal form.
 785 VALUE should have the form `FOO' or `(not FOO)', where FOO is an atom.
 786 FOO is converted to (FOO nil) and (not FOO) is converted to (FOO t)."
 787   ;; (debug value)
 788   (if (atom value)
 789       (list value nil)
 790     (list (nth 1 value) t)))
 791
 792 (defun gnus-widget-reversible-to-external (widget value)
 793   "Ignoring WIDGET, convert VALUE to external form.
 794 VALUE should have the form `(FOO nil)' or `(FOO t)', where FOO is an atom.
 795 \(FOO  nil) is converted to FOO and (FOO t) is converted to (not FOO)."
 796   ;; (debug value)
 797   (if (nth 1 value)
 798       (list 'not (nth 0 value))
 799     (nth 0 value)))
 800
 801 (define-widget 'gnus-widget-reversible 'group
 802   "A `group' that convert values."
 803   :match 'gnus-widget-reversible-match
 804   :value-to-internal 'gnus-widget-reversible-to-internal
 805   :value-to-external 'gnus-widget-reversible-to-external)
 806
 807 (defcustom gnus-article-sort-functions '(gnus-article-sort-by-number)
 808   "*List of functions used for sorting articles in the summary buffer.
 809
 810 Each function takes two articles and returns non-nil if the first
 811 article should be sorted before the other.  If you use more than one
 812 function, the primary sort function should be the last.  You should
 813 probably always include `gnus-article-sort-by-number' in the list of
 814 sorting functions -- preferably first.  Also note that sorting by date
 815 is often much slower than sorting by number, and the sorting order is
 816 very similar.  (Sorting by date means sorting by the time the message
 817 was sent, sorting by number means sorting by arrival time.)
 818
 819 Each item can also be a list `(not F)' where F is a function;
 820 this reverses the sort order.
 821
 822 Ready-made functions include `gnus-article-sort-by-number',
 823 `gnus-article-sort-by-author', `gnus-article-sort-by-subject',
 824 `gnus-article-sort-by-date', `gnus-article-sort-by-random'
 825 and `gnus-article-sort-by-score'.
 826
 827 When threading is turned on, the variable `gnus-thread-sort-functions'
 828 controls how articles are sorted."
 829   :group 'gnus-summary-sort
 830   :type '(repeat (gnus-widget-reversible
 831                   (choice (function-item gnus-article-sort-by-number)
 832                           (function-item gnus-article-sort-by-author)
 833                           (function-item gnus-article-sort-by-subject)
 834                           (function-item gnus-article-sort-by-date)
 835                           (function-item gnus-article-sort-by-score)
 836                           (function-item gnus-article-sort-by-random)
 837                           (function :tag "other"))
 838                   (boolean :tag "Reverse order"))))
 839
 840
 841 (defcustom gnus-thread-sort-functions '(gnus-thread-sort-by-number)
 842   "*List of functions used for sorting threads in the summary buffer.
 843 By default, threads are sorted by article number.
 844
 845 Each function takes two threads and returns non-nil if the first
 846 thread should be sorted before the other.  If you use more than one
 847 function, the primary sort function should be the last.  You should
 848 probably always include `gnus-thread-sort-by-number' in the list of
 849 sorting functions -- preferably first.  Also note that sorting by date
 850 is often much slower than sorting by number, and the sorting order is
 851 very similar.  (Sorting by date means sorting by the time the message
 852 was sent, sorting by number means sorting by arrival time.)
 853
 854 Each list item can also be a list `(not F)' where F is a
 855 function; this specifies reversed sort order.
 856
 857 Ready-made functions include `gnus-thread-sort-by-number',
 858 `gnus-thread-sort-by-author', `gnus-thread-sort-by-recipient'
 859 `gnus-thread-sort-by-subject', `gnus-thread-sort-by-date',
 860 `gnus-thread-sort-by-score', `gnus-thread-sort-by-most-recent-number',
 861 `gnus-thread-sort-by-most-recent-date', `gnus-thread-sort-by-random',
 862 and `gnus-thread-sort-by-total-score' (see
 863 `gnus-thread-score-function').
 864
 865 When threading is turned off, the variable
 866 `gnus-article-sort-functions' controls how articles are sorted."
 867   :group 'gnus-summary-sort
 868   :type '(repeat
 869           (gnus-widget-reversible
 870            (choice (function-item gnus-thread-sort-by-number)
 871                    (function-item gnus-thread-sort-by-author)
 872                    (function-item gnus-thread-sort-by-recipient)
 873                    (function-item gnus-thread-sort-by-subject)
 874                    (function-item gnus-thread-sort-by-date)
 875                    (function-item gnus-thread-sort-by-score)
 876                    (function-item gnus-thread-sort-by-most-recent-number)
 877                    (function-item gnus-thread-sort-by-most-recent-date)
 878                    (function-item gnus-thread-sort-by-random)
 879                    (function-item gnus-thread-sort-by-total-score)
 880                    (function :tag "other"))
 881            (boolean :tag "Reverse order"))))
 882
 883 (defcustom gnus-thread-score-function '+
 884   "*Function used for calculating the total score of a thread.
 885
 886 The function is called with the scores of the article and each
 887 subthread and should then return the score of the thread.
 888
 889 Some functions you can use are `+', `max', or `min'."
 890   :group 'gnus-summary-sort
 891   :type 'function)
 892
 893 (defcustom gnus-summary-expunge-below nil
 894   "All articles that have a score less than this variable will be expunged.
 895 This variable is local to the summary buffers."
 896   :group 'gnus-score-default
 897   :type '(choice (const :tag "off" nil)
 898                  integer))
 899
 900 (defcustom gnus-thread-expunge-below nil
 901   "All threads that have a total score less than this variable will be expunged.
 902 See `gnus-thread-score-function' for en explanation of what a
 903 \"thread score\" is.
 904
 905 This variable is local to the summary buffers."
 906   :group 'gnus-threading
 907   :group 'gnus-score-default
 908   :type '(choice (const :tag "off" nil)
 909                  integer))
 910
 911 (defcustom gnus-summary-mode-hook nil
 912   "*A hook for Gnus summary mode.
 913 This hook is run before any variables are set in the summary buffer."
 914   :options '(turn-on-gnus-mailing-list-mode gnus-pick-mode)
 915   :group 'gnus-summary-various
 916   :type 'hook)
 917
 918 ;; Extracted from gnus-xmas-redefine in order to preserve user settings
 919 (when (featurep 'xemacs)
 920   (add-hook 'gnus-summary-mode-hook 'gnus-xmas-summary-menu-add)
 921   (add-hook 'gnus-summary-mode-hook 'gnus-xmas-setup-summary-toolbar)
 922   (add-hook 'gnus-summary-mode-hook
 923             'gnus-xmas-switch-horizontal-scrollbar-off))
 924
 925 (defcustom gnus-summary-menu-hook nil
 926   "*Hook run after the creation of the summary mode menu."
 927   :group 'gnus-summary-visual
 928   :type 'hook)
 929
 930 (defcustom gnus-summary-exit-hook nil
 931   "*A hook called on exit from the summary buffer.
 932 It will be called with point in the group buffer."
 933   :group 'gnus-summary-exit
 934   :type 'hook)
 935
 936 (defcustom gnus-summary-prepare-hook nil
 937   "*A hook called after the summary buffer has been generated.
 938 If you want to modify the summary buffer, you can use this hook."
 939   :group 'gnus-summary-various
 940   :type 'hook)
 941
 942 (defcustom gnus-summary-prepared-hook nil
 943   "*A hook called as the last thing after the summary buffer has been generated."
 944   :group 'gnus-summary-various
 945   :type 'hook)
 946
 947 (defcustom gnus-summary-generate-hook nil
 948   "*A hook run just before generating the summary buffer.
 949 This hook is commonly used to customize threading variables and the
 950 like."
 951   :group 'gnus-summary-various
 952   :type 'hook)
 953
 954 (defcustom gnus-select-group-hook nil
 955   "*A hook called when a newsgroup is selected.
 956
 957 If you'd like to simplify subjects like the
 958 `gnus-summary-next-same-subject' command does, you can use the
 959 following hook:
 960
 961  (add-hook gnus-select-group-hook
 962            (lambda ()
 963              (mapcar (lambda (header)
 964                        (mail-header-set-subject
 965                         header
 966                         (gnus-simplify-subject
 967                          (mail-header-subject header) 're-only)))
 968                      gnus-newsgroup-headers)))"
 969   :group 'gnus-group-select
 970   :type 'hook)
 971
 972 (defcustom gnus-select-article-hook nil
 973   "*A hook called when an article is selected."
 974   :group 'gnus-summary-choose
 975   :options '(gnus-agent-fetch-selected-article)
 976   :type 'hook)
 977
 978 (defcustom gnus-visual-mark-article-hook
 979   (list 'gnus-highlight-selected-summary)
 980   "*Hook run after selecting an article in the summary buffer.
 981 It is meant to be used for highlighting the article in some way.  It
 982 is not run if `gnus-visual' is nil."
 983   :group 'gnus-summary-visual
 984   :type 'hook)
 985
 986 (defcustom gnus-parse-headers-hook nil
 987   "*A hook called before parsing the headers."
 988   :group 'gnus-various
 989   :type 'hook)
 990
 991 (defcustom gnus-exit-group-hook nil
 992   "*A hook called when exiting summary mode.
 993 This hook is not called from the non-updating exit commands like `Q'."
 994   :group 'gnus-various
 995   :type 'hook)
 996
 997 (defcustom gnus-summary-update-hook nil
 998   "*A hook called when a summary line is changed.
 999 The hook will not be called if `gnus-visual' is nil.
1000
1001 The default function `gnus-summary-highlight-line' will
1002 highlight the line according to the `gnus-summary-highlight'
1003 variable."
1004   :group 'gnus-summary-visual
1005   :type 'hook)
1006
1007 (defcustom gnus-mark-article-hook '(gnus-summary-mark-read-and-unread-as-read)
1008   "*A hook called when an article is selected for the first time.
1009 The hook is intended to mark an article as read (or unread)
1010 automatically when it is selected."
1011   :group 'gnus-summary-choose
1012   :type 'hook)
1013
1014 (defcustom gnus-group-no-more-groups-hook nil
1015   "*A hook run when returning to group mode having no more (unread) groups."
1016   :group 'gnus-group-select
1017   :type 'hook)
1018
1019 (defcustom gnus-ps-print-hook nil
1020   "*A hook run before ps-printing something from Gnus."
1021   :group 'gnus-summary
1022   :type 'hook)
1023
1024 (defcustom gnus-summary-article-move-hook nil
1025   "*A hook called after an article is moved, copied, respooled, or crossposted."
1026   :version "22.1"
1027   :group 'gnus-summary
1028   :type 'hook)
1029
1030 (defcustom gnus-summary-article-delete-hook nil
1031   "*A hook called after an article is deleted."
1032   :version "22.1"
1033   :group 'gnus-summary
1034   :type 'hook)
1035
1036 (defcustom gnus-summary-article-expire-hook nil
1037   "*A hook called after an article is expired."
1038   :version "22.1"
1039   :group 'gnus-summary
1040   :type 'hook)
1041
1042 (defcustom gnus-summary-display-arrow
1043   (and (fboundp 'display-graphic-p)
1044        (display-graphic-p))
1045   "*If non-nil, display an arrow highlighting the current article."
1046   :version "22.1"
1047   :group 'gnus-summary
1048   :type 'boolean)
1049
1050 (defcustom gnus-summary-selected-face 'gnus-summary-selected
1051   "Face used for highlighting the current article in the summary buffer."
1052   :group 'gnus-summary-visual
1053   :type 'face)
1054
1055 (defvar gnus-tmp-downloaded nil)
1056
1057 (defcustom gnus-summary-highlight
1058   '(((eq mark gnus-canceled-mark)
1059      . gnus-summary-cancelled)
1060     ((and uncached (> score default-high))
1061      . gnus-summary-high-undownloaded)
1062     ((and uncached (< score default-low))
1063      . gnus-summary-low-undownloaded)
1064     (uncached
1065      . gnus-summary-normal-undownloaded)
1066     ((and (> score default-high)
1067           (or (eq mark gnus-dormant-mark)
1068               (eq mark gnus-ticked-mark)))
1069      . gnus-summary-high-ticked)
1070     ((and (< score default-low)
1071           (or (eq mark gnus-dormant-mark)
1072               (eq mark gnus-ticked-mark)))
1073      . gnus-summary-low-ticked)
1074     ((or (eq mark gnus-dormant-mark)
1075          (eq mark gnus-ticked-mark))
1076      . gnus-summary-normal-ticked)
1077     ((and (> score default-high) (eq mark gnus-ancient-mark))
1078      . gnus-summary-high-ancient)
1079     ((and (< score default-low) (eq mark gnus-ancient-mark))
1080      . gnus-summary-low-ancient)
1081     ((eq mark gnus-ancient-mark)
1082      . gnus-summary-normal-ancient)
1083     ((and (> score default-high) (eq mark gnus-unread-mark))
1084      . gnus-summary-high-unread)
1085     ((and (< score default-low) (eq mark gnus-unread-mark))
1086      . gnus-summary-low-unread)
1087     ((eq mark gnus-unread-mark)
1088      . gnus-summary-normal-unread)
1089     ((> score default-high)
1090      . gnus-summary-high-read)
1091     ((< score default-low)
1092      . gnus-summary-low-read)
1093     (t
1094      . gnus-summary-normal-read))
1095   "*Controls the highlighting of summary buffer lines.
1096
1097 A list of (FORM . FACE) pairs.  When deciding how a particular
1098 summary line should be displayed, each form is evaluated.  The content
1099 of the face field after the first true form is used.  You can change
1100 how those summary lines are displayed, by editing the face field.
1101
1102 You can use the following variables in the FORM field.
1103
1104 score:        The article's score.
1105 default:      The default article score.
1106 default-high: The default score for high scored articles.
1107 default-low:  The default score for low scored articles.
1108 below:        The score below which articles are automatically marked as read.
1109 mark:         The article's mark.
1110 uncached:     Non-nil if the article is uncached."
1111   :group 'gnus-summary-visual
1112   :type '(repeat (cons (sexp :tag "Form" nil)
1113                        face)))
1114 (put 'gnus-summary-highlight 'risky-local-variable t)
1115
1116 (defcustom gnus-alter-header-function nil
1117   "Function called to allow alteration of article header structures.
1118 The function is called with one parameter, the article header vector,
1119 which it may alter in any way."
1120   :type '(choice (const :tag "None" nil)
1121                  function)
1122   :group 'gnus-summary)
1123
1124 (defvar gnus-decode-encoded-word-function 'mail-decode-encoded-word-string
1125   "Function used to decode a string with encoded words.")
1126
1127 (defvar gnus-decode-encoded-address-function
1128   'mail-decode-encoded-address-string
1129   "Function used to decode addresses with encoded words.")
1130
1131 (defcustom gnus-extra-headers '(To Newsgroups)
1132   "*Extra headers to parse."
1133   :version "21.1"
1134   :group 'gnus-summary
1135   :type '(repeat symbol))
1136
1137 (defcustom gnus-ignored-from-addresses
1138   (and user-mail-address
1139        (not (string= user-mail-address ""))
1140        (regexp-quote user-mail-address))
1141   "*From headers that may be suppressed in favor of To headers.
1142 This can be a regexp or a list of regexps."
1143   :version "21.1"
1144   :group 'gnus-summary
1145   :type '(choice regexp
1146                  (repeat :tag "Regexp List" regexp)))
1147
1148 (defsubst gnus-ignored-from-addresses ()
1149   (gmm-regexp-concat gnus-ignored-from-addresses))
1150
1151 (defcustom gnus-summary-to-prefix "-> "
1152   "*String prefixed to the To field in the summary line when
1153 using `gnus-ignored-from-addresses'."
1154   :version "22.1"
1155   :group 'gnus-summary
1156   :type 'string)
1157
1158 (defcustom gnus-summary-newsgroup-prefix "=> "
1159   "*String prefixed to the Newsgroup field in the summary
1160 line when using `gnus-ignored-from-addresses'."
1161   :version "22.1"
1162   :group 'gnus-summary
1163   :type 'string)
1164
1165 (defcustom gnus-newsgroup-ignored-charsets '(unknown-8bit x-unknown)
1166   "List of charsets that should be ignored.
1167 When these charsets are used in the \"charset\" parameter, the
1168 default charset will be used instead."
1169   :version "21.1"
1170   :type '(repeat symbol)
1171   :group 'gnus-charset)
1172
1173 (defcustom gnus-newsgroup-maximum-articles nil
1174   "The maximum number of articles a newsgroup.
1175 If this is a number, old articles in a newsgroup exceeding this number
1176 are silently ignored.  If it is nil, no article is ignored.  Note that
1177 setting this variable to a number might prevent you from reading very
1178 old articles."
1179   :group 'gnus-group-select
1180   :version "22.2"
1181   :type '(choice (const :tag "No limit" nil)
1182                  integer))
1183
1184 (gnus-define-group-parameter
1185  ignored-charsets
1186  :type list
1187  :function-document
1188  "Return the ignored charsets of GROUP."
1189  :variable gnus-group-ignored-charsets-alist
1190  :variable-default
1191  '(("alt\\.chinese\\.text" iso-8859-1))
1192  :variable-document
1193  "Alist of regexps (to match group names) and charsets that should be ignored.
1194 When these charsets are used in the \"charset\" parameter, the
1195 default charset will be used instead."
1196  :variable-group gnus-charset
1197  :variable-type '(repeat (cons (regexp :tag "Group")
1198                                (repeat symbol)))
1199  :parameter-type '(choice :tag "Ignored charsets"
1200                           :value nil
1201                           (repeat (symbol)))
1202  :parameter-document       "\
1203 List of charsets that should be ignored.
1204
1205 When these charsets are used in the \"charset\" parameter, the
1206 default charset will be used instead.")
1207
1208 (defcustom gnus-group-highlight-words-alist nil
1209   "Alist of group regexps and highlight regexps.
1210 This variable uses the same syntax as `gnus-emphasis-alist'."
1211   :version "21.1"
1212   :type '(repeat (cons (regexp :tag "Group")
1213                        (repeat (list (regexp :tag "Highlight regexp")
1214                                      (number :tag "Group for entire word" 0)
1215                                      (number :tag "Group for displayed part" 0)
1216                                      (symbol :tag "Face"
1217                                              gnus-emphasis-highlight-words)))))
1218   :group 'gnus-summary-visual)
1219
1220 (defcustom gnus-summary-show-article-charset-alist
1221   nil
1222   "Alist of number and charset.
1223 The article will be shown with the charset corresponding to the
1224 numbered argument.
1225 For example: ((1 . cn-gb-2312) (2 . big5))."
1226   :version "21.1"
1227   :type '(repeat (cons (number :tag "Argument" 1)
1228                        (symbol :tag "Charset")))
1229   :group 'gnus-charset)
1230
1231 (defcustom gnus-preserve-marks t
1232   "Whether marks are preserved when moving, copying and respooling messages."
1233   :version "21.1"
1234   :type 'boolean
1235   :group 'gnus-summary-marks)
1236
1237 (defcustom gnus-propagate-marks t
1238   "If non-nil, do not propagate marks to the backends."
1239   :version "23.1" ;; No Gnus
1240   :type 'boolean
1241   :group 'gnus-summary-marks)
1242
1243 (defcustom gnus-alter-articles-to-read-function nil
1244   "Function to be called to alter the list of articles to be selected."
1245   :type '(choice (const nil) function)
1246   :group 'gnus-summary)
1247
1248 (defcustom gnus-orphan-score nil
1249   "*All orphans get this score added.  Set in the score file."
1250   :group 'gnus-score-default
1251   :type '(choice (const nil)
1252                  integer))
1253
1254 (defcustom gnus-summary-save-parts-default-mime "image/.*"
1255   "*A regexp to match MIME parts when saving multiple parts of a
1256 message with `gnus-summary-save-parts' (\\<gnus-summary-mode-map>\\[gnus-summary-save-parts]).
1257 This regexp will be used by default when prompting the user for which
1258 type of files to save."
1259   :group 'gnus-summary
1260   :type 'regexp)
1261
1262 (defcustom gnus-read-all-available-headers nil
1263   "Whether Gnus should parse all headers made available to it.
1264 This is mostly relevant for slow back ends where the user may
1265 wish to widen the summary buffer to include all headers
1266 that were fetched."
1267   :version "22.1"
1268   :group 'gnus-summary
1269   :type '(choice boolean regexp))
1270
1271 (defcustom gnus-summary-pipe-output-default-command nil
1272   "Command (and optional arguments) used to pipe article to subprocess.
1273 This will be used as the default command if it is non-nil.  The value
1274 will be updated if you modify it when executing the command
1275 `gnus-summary-pipe-output' or the function `gnus-summary-save-in-pipe'."
1276   :version "23.1" ;; No Gnus
1277   :group 'gnus-summary
1278   :type '(radio (const :tag "None" nil) (string :tag "Command")))
1279
1280 (defcustom gnus-summary-muttprint-program "muttprint"
1281   "Command (and optional arguments) used to run Muttprint.
1282 The value will be updated if you modify it when executing the command
1283 `gnus-summary-muttprint'."
1284   :version "22.1"
1285   :group 'gnus-summary
1286   :type 'string)
1287
1288 (defcustom gnus-article-loose-mime t
1289   "If non-nil, don't require MIME-Version header.
1290 Some brain-damaged MUA/MTA, e.g. Lotus Domino 5.0.6 clients, does not
1291 supply the MIME-Version header or deliberately strip it from the mail.
1292 If non-nil (the default), Gnus will treat some articles as MIME
1293 even if the MIME-Version header is missing."
1294   :version "22.1"
1295   :type 'boolean
1296   :group 'gnus-article-mime)
1297
1298 (defcustom gnus-article-emulate-mime t
1299   "If non-nil, use MIME emulation for uuencode and the like.
1300 This means that Gnus will search message bodies for text that look
1301 like uuencoded bits, yEncoded bits, and so on, and present that using
1302 the normal Gnus MIME machinery."
1303   :version "22.1"
1304   :type 'boolean
1305   :group 'gnus-article-mime)
1306
1307 ;;; Internal variables
1308
1309 (defvar gnus-summary-display-cache nil)
1310 (defvar gnus-article-mime-handles nil)
1311 (defvar gnus-article-decoded-p nil)
1312 (defvar gnus-article-charset nil)
1313 (defvar gnus-article-ignored-charsets nil)
1314 (defvar gnus-scores-exclude-files nil)
1315 (defvar gnus-page-broken nil)
1316
1317 (defvar gnus-original-article nil)
1318 (defvar gnus-article-internal-prepare-hook nil)
1319 (defvar gnus-newsgroup-process-stack nil)
1320
1321 (defvar gnus-thread-indent-array nil)
1322 (defvar gnus-thread-indent-array-level gnus-thread-indent-level)
1323 (defvar gnus-sort-gathered-threads-function 'gnus-thread-sort-by-number
1324   "Function called to sort the articles within a thread after it has been gathered together.")
1325
1326 (defvar gnus-summary-save-parts-type-history nil)
1327 (defvar gnus-summary-save-parts-last-directory mm-default-directory)
1328
1329 ;; Avoid highlighting in kill files.
1330 (defvar gnus-summary-inhibit-highlight nil)
1331 (defvar gnus-newsgroup-selected-overlay nil)
1332 (defvar gnus-inhibit-limiting nil)
1333 (defvar gnus-newsgroup-adaptive-score-file nil)
1334 (defvar gnus-current-score-file nil)
1335 (defvar gnus-current-move-group nil)
1336 (defvar gnus-current-copy-group nil)
1337 (defvar gnus-current-crosspost-group nil)
1338 (defvar gnus-newsgroup-display nil)
1339
1340 (defvar gnus-newsgroup-dependencies nil)
1341 (defvar gnus-newsgroup-adaptive nil)
1342 (defvar gnus-summary-display-article-function nil)
1343 (defvar gnus-summary-highlight-line-function nil
1344   "Function called after highlighting a summary line.")
1345
1346 (defvar gnus-summary-line-format-alist
1347   `((?N ,(macroexpand '(mail-header-number gnus-tmp-header)) ?d)
1348     (?S ,(macroexpand '(mail-header-subject gnus-tmp-header)) ?s)
1349     (?s gnus-tmp-subject-or-nil ?s)
1350     (?n gnus-tmp-name ?s)
1351     (?A (car (cdr (funcall gnus-extract-address-components gnus-tmp-from)))
1352         ?s)
1353     (?a (or (car (funcall gnus-extract-address-components gnus-tmp-from))
1354             gnus-tmp-from) ?s)
1355     (?F gnus-tmp-from ?s)
1356     (?x ,(macroexpand '(mail-header-xref gnus-tmp-header)) ?s)
1357     (?D ,(macroexpand '(mail-header-date gnus-tmp-header)) ?s)
1358     (?d (gnus-dd-mmm (mail-header-date gnus-tmp-header)) ?s)
1359     (?o (gnus-date-iso8601 (mail-header-date gnus-tmp-header)) ?s)
1360     (?M ,(macroexpand '(mail-header-id gnus-tmp-header)) ?s)
1361     (?r ,(macroexpand '(mail-header-references gnus-tmp-header)) ?s)
1362     (?c (or (mail-header-chars gnus-tmp-header) 0) ?d)
1363     (?k (gnus-summary-line-message-size gnus-tmp-header) ?s)
1364     (?L gnus-tmp-lines ?s)
1365     (?Z (or ,(gnus-macroexpand-all
1366               '(nnir-article-rsv (mail-header-number gnus-tmp-header)))
1367             0) ?d)
1368     (?G (or ,(gnus-macroexpand-all
1369               '(nnir-article-group (mail-header-number gnus-tmp-header)))
1370             "") ?s)
1371     (?g (or ,(gnus-macroexpand-all
1372               '(gnus-group-short-name
1373                 (nnir-article-group (mail-header-number gnus-tmp-header))))
1374             "") ?s)
1375     (?O gnus-tmp-downloaded ?c)
1376     (?I gnus-tmp-indentation ?s)
1377     (?T (if (= gnus-tmp-level 0) "" (make-string (frame-width) ? )) ?s)
1378     (?R gnus-tmp-replied ?c)
1379     (?\[ gnus-tmp-opening-bracket ?c)
1380     (?\] gnus-tmp-closing-bracket ?c)
1381     (?\> (make-string gnus-tmp-level ? ) ?s)
1382     (?\< (make-string (max 0 (- 20 gnus-tmp-level)) ? ) ?s)
1383     (?i gnus-tmp-score ?d)
1384     (?z gnus-tmp-score-char ?c)
1385     (?V (gnus-thread-total-score (and (boundp 'thread) (car thread))) ?d)
1386     (?U gnus-tmp-unread ?c)
1387     (?f (gnus-summary-from-or-to-or-newsgroups gnus-tmp-header gnus-tmp-from)
1388         ?s)
1389     (?t (gnus-summary-number-of-articles-in-thread
1390          (and (boundp 'thread) (car thread)) gnus-tmp-level)
1391         ?d)
1392     (?e (gnus-summary-number-of-articles-in-thread
1393          (and (boundp 'thread) (car thread)) gnus-tmp-level t)
1394         ?c)
1395     (?u gnus-tmp-user-defined ?s)
1396     (?P (gnus-pick-line-number) ?d)
1397     (?B gnus-tmp-thread-tree-header-string ?s)
1398     (user-date (gnus-user-date
1399                 ,(macroexpand '(mail-header-date gnus-tmp-header))) ?s))
1400   "An alist of format specifications that can appear in summary lines.
1401 These are paired with what variables they correspond with, along with
1402 the type of the variable (string, integer, character, etc).")
1403
1404 (defvar gnus-summary-dummy-line-format-alist
1405   `((?S gnus-tmp-subject ?s)
1406     (?N gnus-tmp-number ?d)
1407     (?u gnus-tmp-user-defined ?s)))
1408
1409 (defvar gnus-summary-mode-line-format-alist
1410   `((?G gnus-tmp-group-name ?s)
1411     (?g (gnus-short-group-name gnus-tmp-group-name) ?s)
1412     (?p (gnus-group-real-name gnus-tmp-group-name) ?s)
1413     (?A gnus-tmp-article-number ?d)
1414     (?Z gnus-tmp-unread-and-unselected ?s)
1415     (?V gnus-version ?s)
1416     (?U gnus-tmp-unread-and-unticked ?d)
1417     (?S gnus-tmp-subject ?s)
1418     (?e gnus-tmp-unselected ?d)
1419     (?u gnus-tmp-user-defined ?s)
1420     (?d (length gnus-newsgroup-dormant) ?d)
1421     (?t (length gnus-newsgroup-marked) ?d)
1422     (?h (length gnus-newsgroup-spam-marked) ?d)
1423     (?r (length gnus-newsgroup-reads) ?d)
1424     (?z (gnus-summary-article-score gnus-tmp-article-number) ?d)
1425     (?E gnus-newsgroup-expunged-tally ?d)
1426     (?s (gnus-current-score-file-nondirectory) ?s)))
1427
1428 ;; This is here rather than in gnus-art for compilation reasons.
1429 (defvar gnus-article-mode-line-format-alist
1430   (nconc '((?w (gnus-article-wash-status) ?s)
1431            (?m (gnus-article-mime-part-status) ?s))
1432          gnus-summary-mode-line-format-alist))
1433
1434 (defvar gnus-last-search-regexp nil
1435   "Default regexp for article search command.")
1436
1437 (defvar gnus-last-shell-command nil
1438   "Default shell command on article.")
1439
1440 (defvar gnus-newsgroup-agentized nil
1441   "Locally bound in each summary buffer to indicate whether the server has been agentized.")
1442 (defvar gnus-newsgroup-begin nil)
1443 (defvar gnus-newsgroup-end nil)
1444 (defvar gnus-newsgroup-last-rmail nil)
1445 (defvar gnus-newsgroup-last-mail nil)
1446 (defvar gnus-newsgroup-last-folder nil)
1447 (defvar gnus-newsgroup-last-file nil)
1448 (defvar gnus-newsgroup-last-directory nil)
1449 (defvar gnus-newsgroup-auto-expire nil)
1450 (defvar gnus-newsgroup-active nil)
1451 (defvar gnus-newsgroup-highest nil)
1452
1453 (defvar gnus-newsgroup-data nil)
1454 (defvar gnus-newsgroup-data-reverse nil)
1455 (defvar gnus-newsgroup-limit nil)
1456 (defvar gnus-newsgroup-limits nil)
1457 (defvar gnus-summary-use-undownloaded-faces nil)
1458
1459 (defvar gnus-newsgroup-unreads nil
1460   "Sorted list of unread articles in the current newsgroup.")
1461
1462 (defvar gnus-newsgroup-unselected nil
1463   "Sorted list of unselected unread articles in the current newsgroup.")
1464
1465 (defvar gnus-newsgroup-reads nil
1466   "Alist of read articles and article marks in the current newsgroup.")
1467
1468 (defvar gnus-newsgroup-expunged-tally nil)
1469
1470 (defvar gnus-newsgroup-marked nil
1471   "Sorted list of ticked articles in the current newsgroup (a subset of unread art).")
1472
1473 (defvar gnus-newsgroup-spam-marked nil
1474   "List of ranges of articles that have been marked as spam.")
1475
1476 (defvar gnus-newsgroup-killed nil
1477   "List of ranges of articles that have been through the scoring process.")
1478
1479 (defvar gnus-newsgroup-cached nil
1480   "Sorted list of articles that come from the article cache.")
1481
1482 (defvar gnus-newsgroup-saved nil
1483   "List of articles that have been saved.")
1484
1485 (defvar gnus-newsgroup-kill-headers nil)
1486
1487 (defvar gnus-newsgroup-replied nil
1488   "List of articles that have been replied to in the current newsgroup.")
1489
1490 (defvar gnus-newsgroup-forwarded nil
1491   "List of articles that have been forwarded in the current newsgroup.")
1492
1493 (defvar gnus-newsgroup-recent nil
1494   "List of articles that have are recent in the current newsgroup.")
1495
1496 (defvar gnus-newsgroup-expirable nil
1497   "Sorted list of articles in the current newsgroup that can be expired.")
1498
1499 (defvar gnus-newsgroup-processable nil
1500   "List of articles in the current newsgroup that can be processed.")
1501
1502 (defvar gnus-newsgroup-downloadable nil
1503   "Sorted list of articles in the current newsgroup that can be processed.")
1504
1505 (defvar gnus-newsgroup-unfetched nil
1506   "Sorted list of articles in the current newsgroup whose headers have
1507 not been fetched into the agent.
1508
1509 This list will always be a subset of gnus-newsgroup-undownloaded.")
1510
1511 (defvar gnus-newsgroup-undownloaded nil
1512   "List of articles in the current newsgroup that haven't been downloaded.")
1513
1514 (defvar gnus-newsgroup-unsendable nil
1515   "List of articles in the current newsgroup that won't be sent.")
1516
1517 (defvar gnus-newsgroup-bookmarks nil
1518   "List of articles in the current newsgroup that have bookmarks.")
1519
1520 (defvar gnus-newsgroup-dormant nil
1521   "Sorted list of dormant articles in the current newsgroup.")
1522
1523 (defvar gnus-newsgroup-unseen nil
1524   "List of unseen articles in the current newsgroup.")
1525
1526 (defvar gnus-newsgroup-seen nil
1527   "Range of seen articles in the current newsgroup.")
1528
1529 (defvar gnus-newsgroup-articles nil
1530   "List of articles in the current newsgroup.")
1531
1532 (defvar gnus-newsgroup-scored nil
1533   "List of scored articles in the current newsgroup.")
1534
1535 (defvar gnus-newsgroup-headers nil
1536   "List of article headers in the current newsgroup.")
1537
1538 (defvar gnus-newsgroup-threads nil)
1539
1540 (defvar gnus-newsgroup-prepared nil
1541   "Whether the current group has been prepared properly.")
1542
1543 (defvar gnus-newsgroup-ancient nil
1544   "List of `gnus-fetch-old-headers' articles in the current newsgroup.")
1545
1546 (defvar gnus-newsgroup-sparse nil)
1547
1548 (defvar gnus-current-article nil)
1549 (defvar gnus-article-current nil)
1550 (defvar gnus-current-headers nil)
1551 (defvar gnus-have-all-headers nil)
1552 (defvar gnus-last-article nil)
1553 (defvar gnus-newsgroup-history nil)
1554 (defvar gnus-newsgroup-charset nil)
1555 (defvar gnus-newsgroup-ephemeral-charset nil)
1556 (defvar gnus-newsgroup-ephemeral-ignored-charsets nil)
1557
1558 (defvar gnus-article-before-search nil)
1559
1560 (defvar gnus-summary-local-variables
1561   '(gnus-newsgroup-name
1562
1563     ;; Marks lists
1564     gnus-newsgroup-unreads
1565     gnus-newsgroup-unselected
1566     gnus-newsgroup-marked
1567     gnus-newsgroup-spam-marked
1568     gnus-newsgroup-reads
1569     gnus-newsgroup-saved
1570     gnus-newsgroup-replied
1571     gnus-newsgroup-forwarded
1572     gnus-newsgroup-recent
1573     gnus-newsgroup-expirable
1574     gnus-newsgroup-killed
1575     gnus-newsgroup-unseen
1576     gnus-newsgroup-seen
1577     gnus-newsgroup-cached
1578     gnus-newsgroup-downloadable
1579     gnus-newsgroup-undownloaded
1580     gnus-newsgroup-unsendable
1581
1582     gnus-newsgroup-begin gnus-newsgroup-end
1583     gnus-newsgroup-last-rmail gnus-newsgroup-last-mail
1584     gnus-newsgroup-last-folder gnus-newsgroup-last-file
1585     gnus-newsgroup-last-directory
1586     gnus-newsgroup-auto-expire
1587     gnus-newsgroup-processable
1588     gnus-newsgroup-unfetched
1589     gnus-newsgroup-articles
1590     gnus-newsgroup-bookmarks gnus-newsgroup-dormant
1591     gnus-newsgroup-headers gnus-newsgroup-threads
1592     gnus-newsgroup-prepared gnus-summary-highlight-line-function
1593     gnus-current-article gnus-current-headers gnus-have-all-headers
1594     gnus-last-article gnus-article-internal-prepare-hook
1595     (gnus-summary-article-delete-hook . global)
1596     (gnus-summary-article-move-hook . global)
1597     gnus-newsgroup-dependencies gnus-newsgroup-selected-overlay
1598     gnus-newsgroup-scored gnus-newsgroup-kill-headers
1599     gnus-thread-expunge-below
1600     gnus-score-alist gnus-current-score-file
1601     (gnus-summary-expunge-below . global)
1602     (gnus-summary-mark-below . global)
1603     (gnus-orphan-score . global)
1604     gnus-newsgroup-active gnus-scores-exclude-files
1605     gnus-newsgroup-highest
1606     gnus-newsgroup-history gnus-newsgroup-ancient
1607     gnus-newsgroup-sparse gnus-newsgroup-process-stack
1608     (gnus-newsgroup-adaptive . gnus-use-adaptive-scoring)
1609     gnus-newsgroup-adaptive-score-file (gnus-reffed-article-number . -1)
1610     (gnus-newsgroup-expunged-tally . 0)
1611     gnus-cache-removable-articles
1612     gnus-newsgroup-data gnus-newsgroup-data-reverse
1613     gnus-newsgroup-limit gnus-newsgroup-limits
1614     gnus-newsgroup-charset gnus-newsgroup-display
1615     gnus-summary-use-undownloaded-faces)
1616   "Variables that are buffer-local to the summary buffers.")
1617
1618 (defvar gnus-newsgroup-variables nil
1619   "A list of variables that have separate values in different newsgroups.
1620 A list of newsgroup (summary buffer) local variables, or cons of
1621 variables and their default expressions to be evalled (when the default
1622 values are not nil), that should be made global while the summary buffer
1623 is active.
1624
1625 Note: The default expressions will be evaluated (using function `eval')
1626 before assignment to the local variable rather than just assigned to it.
1627 If the default expression is the symbol `global', that symbol will not
1628 be evaluated but the global value of the local variable will be used
1629 instead.
1630
1631 These variables can be used to set variables in the group parameters
1632 while still allowing them to affect operations done in other buffers.
1633 For example:
1634
1635 \(setq gnus-newsgroup-variables
1636      '(message-use-followup-to
1637        (gnus-visible-headers .
1638          \"^From:\\\\|^Newsgroups:\\\\|^Subject:\\\\|^Date:\\\\|^To:\")))
1639 ")
1640
1641 (eval-when-compile
1642   ;; Bind features so that require will believe that gnus-sum has
1643   ;; already been loaded (avoids infinite recursion)
1644   (let ((features (cons 'gnus-sum features)))
1645     (require 'gnus-art)))
1646
1647 ;; MIME stuff.
1648
1649 (defvar gnus-decode-encoded-word-methods
1650   '(mail-decode-encoded-word-string)
1651   "List of methods used to decode encoded words.
1652
1653 This variable is a list of FUNCTION or (REGEXP . FUNCTION).  If item
1654 is FUNCTION, FUNCTION will be apply to all newsgroups.  If item is a
1655 \(REGEXP . FUNCTION), FUNCTION will be only apply to thes newsgroups
1656 whose names match REGEXP.
1657
1658 For example:
1659 \((\"chinese\" . gnus-decode-encoded-word-string-by-guess)
1660  mail-decode-encoded-word-string
1661  (\"chinese\" . rfc1843-decode-string))")
1662
1663 (defvar gnus-decode-encoded-word-methods-cache nil)
1664
1665 (defun gnus-multi-decode-encoded-word-string (string)
1666   "Apply the functions from `gnus-encoded-word-methods' that match."
1667   (unless (and gnus-decode-encoded-word-methods-cache
1668                (eq gnus-newsgroup-name
1669                    (car gnus-decode-encoded-word-methods-cache)))
1670     (setq gnus-decode-encoded-word-methods-cache (list gnus-newsgroup-name))
1671     (dolist (method gnus-decode-encoded-word-methods)
1672       (if (symbolp method)
1673           (nconc gnus-decode-encoded-word-methods-cache (list method))
1674         (if (and gnus-newsgroup-name
1675                  (string-match (car method) gnus-newsgroup-name))
1676             (nconc gnus-decode-encoded-word-methods-cache
1677                    (list (cdr method)))))))
1678   (dolist (method (cdr gnus-decode-encoded-word-methods-cache) string)
1679     (setq string (funcall method string))))
1680
1681 ;; Subject simplification.
1682
1683 (defun gnus-simplify-whitespace (str)
1684   "Remove excessive whitespace from STR."
1685   ;; Multiple spaces.
1686   (while (string-match "[ \t][ \t]+" str)
1687     (setq str (concat (substring str 0 (match-beginning 0))
1688                         " "
1689                         (substring str (match-end 0)))))
1690   ;; Leading spaces.
1691   (when (string-match "^[ \t]+" str)
1692     (setq str (substring str (match-end 0))))
1693   ;; Trailing spaces.
1694   (when (string-match "[ \t]+$" str)
1695     (setq str (substring str 0 (match-beginning 0))))
1696   str)
1697
1698 (defun gnus-simplify-all-whitespace (str)
1699   "Remove all whitespace from STR."
1700   (while (string-match "[ \t\n]+" str)
1701     (setq str (replace-match "" nil nil str)))
1702   str)
1703
1704 (defsubst gnus-simplify-subject-re (subject)
1705   "Remove \"Re:\" from subject lines."
1706   (if (string-match message-subject-re-regexp subject)
1707       (substring subject (match-end 0))
1708     subject))
1709
1710 (defun gnus-simplify-subject (subject &optional re-only)
1711   "Remove `Re:' and words in parentheses.
1712 If RE-ONLY is non-nil, strip leading `Re:'s only."
1713   (let ((case-fold-search t))           ;Ignore case.
1714     ;; Remove `Re:', `Re^N:', `Re(n)', and `Re[n]:'.
1715     (when (string-match "\\`\\(re\\([[(^][0-9]+[])]?\\)?:[ \t]*\\)+" subject)
1716       (setq subject (substring subject (match-end 0))))
1717     ;; Remove uninteresting prefixes.
1718     (when (and (not re-only)
1719                gnus-simplify-ignored-prefixes
1720                (string-match gnus-simplify-ignored-prefixes subject))
1721       (setq subject (substring subject (match-end 0))))
1722     ;; Remove words in parentheses from end.
1723     (unless re-only
1724       (while (string-match "[ \t\n]*([^()]*)[ \t\n]*\\'" subject)
1725         (setq subject (substring subject 0 (match-beginning 0)))))
1726     ;; Return subject string.
1727     subject))
1728
1729 ;; Remove any leading "re:"s, any trailing paren phrases, and simplify
1730 ;; all whitespace.
1731 (defsubst gnus-simplify-buffer-fuzzy-step (regexp &optional newtext)
1732   (goto-char (point-min))
1733   (while (re-search-forward regexp nil t)
1734     (replace-match (or newtext ""))))
1735
1736 (defun gnus-simplify-buffer-fuzzy ()
1737   "Simplify string in the buffer fuzzily.
1738 The string in the accessible portion of the current buffer is simplified.
1739 It is assumed to be a single-line subject.
1740 Whitespace is generally cleaned up, and miscellaneous leading/trailing
1741 matter is removed.  Additional things can be deleted by setting
1742 `gnus-simplify-subject-fuzzy-regexp'."
1743   (let ((case-fold-search t)
1744         (modified-tick))
1745     (gnus-simplify-buffer-fuzzy-step "\t" " ")
1746
1747     (while (not (eq modified-tick (buffer-modified-tick)))
1748       (setq modified-tick (buffer-modified-tick))
1749       (cond
1750        ((listp gnus-simplify-subject-fuzzy-regexp)
1751         (mapc 'gnus-simplify-buffer-fuzzy-step
1752               gnus-simplify-subject-fuzzy-regexp))
1753        (gnus-simplify-subject-fuzzy-regexp
1754         (gnus-simplify-buffer-fuzzy-step gnus-simplify-subject-fuzzy-regexp)))
1755       (gnus-simplify-buffer-fuzzy-step "^ *\\[[-+?*!][-+?*!]\\] *")
1756       (gnus-simplify-buffer-fuzzy-step
1757        "^ *\\(re\\|fw\\|fwd\\)[[{(^0-9]*[])}]?[:;] *")
1758       (gnus-simplify-buffer-fuzzy-step "^[[].*:\\( .*\\)[]]$" "\\1"))
1759
1760     (gnus-simplify-buffer-fuzzy-step " *[[{(][^()\n]*[]})] *$")
1761     (gnus-simplify-buffer-fuzzy-step "  +" " ")
1762     (gnus-simplify-buffer-fuzzy-step " $")
1763     (gnus-simplify-buffer-fuzzy-step "^ +")))
1764
1765 (defun gnus-simplify-subject-fuzzy (subject)
1766   "Simplify a subject string fuzzily.
1767 See `gnus-simplify-buffer-fuzzy' for details."
1768   (save-excursion
1769     (gnus-set-work-buffer)
1770     (let ((case-fold-search t))
1771       ;; Remove uninteresting prefixes.
1772       (when (and gnus-simplify-ignored-prefixes
1773                  (string-match gnus-simplify-ignored-prefixes subject))
1774         (setq subject (substring subject (match-end 0))))
1775       (insert subject)
1776       (inline (gnus-simplify-buffer-fuzzy))
1777       (buffer-string))))
1778
1779 (defsubst gnus-simplify-subject-fully (subject)
1780   "Simplify a subject string according to `gnus-summary-gather-subject-limit'."
1781   (cond
1782    (gnus-simplify-subject-functions
1783     (gnus-map-function gnus-simplify-subject-functions subject))
1784    ((null gnus-summary-gather-subject-limit)
1785     (gnus-simplify-subject-re subject))
1786    ((eq gnus-summary-gather-subject-limit 'fuzzy)
1787     (gnus-simplify-subject-fuzzy subject))
1788    ((numberp gnus-summary-gather-subject-limit)
1789     (truncate-string-to-width (gnus-simplify-subject-re subject)
1790                               gnus-summary-gather-subject-limit))
1791    (t
1792     subject)))
1793
1794 (defsubst gnus-subject-equal (s1 s2 &optional simple-first)
1795   "Check whether two subjects are equal.
1796 If optional argument SIMPLE-FIRST is t, first argument is already
1797 simplified."
1798   (cond
1799    ((null simple-first)
1800     (equal (gnus-simplify-subject-fully s1)
1801            (gnus-simplify-subject-fully s2)))
1802    (t
1803     (equal s1
1804            (gnus-simplify-subject-fully s2)))))
1805
1806 (defun gnus-summary-bubble-group ()
1807   "Increase the score of the current group.
1808 This is a handy function to add to `gnus-summary-exit-hook' to
1809 increase the score of each group you read."
1810   (gnus-group-add-score gnus-newsgroup-name))
1811
1812 \f
1813 ;;;
1814 ;;; Gnus summary mode
1815 ;;;
1816
1817 (put 'gnus-summary-mode 'mode-class 'special)
1818
1819 (defvar gnus-article-commands-menu)
1820
1821 ;; Non-orthogonal keys
1822
1823 (gnus-define-keys gnus-summary-mode-map
1824   " " gnus-summary-next-page
1825   "\177" gnus-summary-prev-page
1826   [delete] gnus-summary-prev-page
1827   [backspace] gnus-summary-prev-page
1828   "\r" gnus-summary-scroll-up
1829   "\M-\r" gnus-summary-scroll-down
1830   "n" gnus-summary-next-unread-article
1831   "p" gnus-summary-prev-unread-article
1832   "N" gnus-summary-next-article
1833   "P" gnus-summary-prev-article
1834   "\M-\C-n" gnus-summary-next-same-subject
1835   "\M-\C-p" gnus-summary-prev-same-subject
1836   "\M-n" gnus-summary-next-unread-subject
1837   "\M-p" gnus-summary-prev-unread-subject
1838   "." gnus-summary-first-unread-article
1839   "," gnus-summary-best-unread-article
1840   "\M-s" gnus-summary-search-article-forward
1841   "\M-r" gnus-summary-search-article-backward
1842   "\M-S" gnus-summary-repeat-search-article-forward
1843   "\M-R" gnus-summary-repeat-search-article-backward
1844   "<" gnus-summary-beginning-of-article
1845   ">" gnus-summary-end-of-article
1846   "j" gnus-summary-goto-article
1847   "^" gnus-summary-refer-parent-article
1848   "\M-^" gnus-summary-refer-article
1849   "u" gnus-summary-tick-article-forward
1850   "!" gnus-summary-tick-article-forward
1851   "U" gnus-summary-tick-article-backward
1852   "d" gnus-summary-mark-as-read-forward
1853   "D" gnus-summary-mark-as-read-backward
1854   "E" gnus-summary-mark-as-expirable
1855   "\M-u" gnus-summary-clear-mark-forward
1856   "\M-U" gnus-summary-clear-mark-backward
1857   "k" gnus-summary-kill-same-subject-and-select
1858   "\C-k" gnus-summary-kill-same-subject
1859   "\M-\C-k" gnus-summary-kill-thread
1860   "\M-\C-l" gnus-summary-lower-thread
1861   "e" gnus-summary-edit-article
1862   "#" gnus-summary-mark-as-processable
1863   "\M-#" gnus-summary-unmark-as-processable
1864   "\M-\C-t" gnus-summary-toggle-threads
1865   "\M-\C-s" gnus-summary-show-thread
1866   "\M-\C-h" gnus-summary-hide-thread
1867   "\M-\C-f" gnus-summary-next-thread
1868   "\M-\C-b" gnus-summary-prev-thread
1869   [(meta down)] gnus-summary-next-thread
1870   [(meta up)] gnus-summary-prev-thread
1871   "\M-\C-u" gnus-summary-up-thread
1872   "\M-\C-d" gnus-summary-down-thread
1873   "&" gnus-summary-execute-command
1874   "c" gnus-summary-catchup-and-exit
1875   "\C-w" gnus-summary-mark-region-as-read
1876   "\C-t" gnus-summary-toggle-truncation
1877   "?" gnus-summary-mark-as-dormant
1878   "\C-c\M-\C-s" gnus-summary-limit-include-expunged
1879   "\C-c\C-s\C-n" gnus-summary-sort-by-number
1880   "\C-c\C-s\C-m\C-n" gnus-summary-sort-by-most-recent-number
1881   "\C-c\C-s\C-l" gnus-summary-sort-by-lines
1882   "\C-c\C-s\C-c" gnus-summary-sort-by-chars
1883   "\C-c\C-s\C-a" gnus-summary-sort-by-author
1884   "\C-c\C-s\C-t" gnus-summary-sort-by-recipient
1885   "\C-c\C-s\C-s" gnus-summary-sort-by-subject
1886   "\C-c\C-s\C-d" gnus-summary-sort-by-date
1887   "\C-c\C-s\C-m\C-d" gnus-summary-sort-by-most-recent-date
1888   "\C-c\C-s\C-i" gnus-summary-sort-by-score
1889   "\C-c\C-s\C-o" gnus-summary-sort-by-original
1890   "\C-c\C-s\C-r" gnus-summary-sort-by-random
1891   "=" gnus-summary-expand-window
1892   "\C-x\C-s" gnus-summary-reselect-current-group
1893   "\M-g" gnus-summary-rescan-group
1894   "\C-c\C-r" gnus-summary-caesar-message
1895   "f" gnus-summary-followup
1896   "F" gnus-summary-followup-with-original
1897   "C" gnus-summary-cancel-article
1898   "r" gnus-summary-reply
1899   "R" gnus-summary-reply-with-original
1900   "\C-c\C-f" gnus-summary-mail-forward
1901   "o" gnus-summary-save-article
1902   "\C-o" gnus-summary-save-article-mail
1903   "|" gnus-summary-pipe-output
1904   "\M-k" gnus-summary-edit-local-kill
1905   "\M-K" gnus-summary-edit-global-kill
1906   ;; "V" gnus-version
1907   "\C-c\C-d" gnus-summary-describe-group
1908   "q" gnus-summary-exit
1909   "Q" gnus-summary-exit-no-update
1910   "\C-c\C-i" gnus-info-find-node
1911   gnus-mouse-2 gnus-mouse-pick-article
1912   [follow-link] mouse-face
1913   "m" gnus-summary-mail-other-window
1914   "a" gnus-summary-post-news
1915   "x" gnus-summary-limit-to-unread
1916   "s" gnus-summary-isearch-article
1917   [tab] gnus-summary-widget-forward
1918   "t" gnus-summary-toggle-header
1919   "g" gnus-summary-show-article
1920   "l" gnus-summary-goto-last-article
1921   "\C-c\C-v\C-v" gnus-uu-decode-uu-view
1922   "\C-d" gnus-summary-enter-digest-group
1923   "\M-\C-d" gnus-summary-read-document
1924   "\M-\C-e" gnus-summary-edit-parameters
1925   "\M-\C-a" gnus-summary-customize-parameters
1926   "\C-c\C-b" gnus-bug
1927   "*" gnus-cache-enter-article
1928   "\M-*" gnus-cache-remove-article
1929   "\M-&" gnus-summary-universal-argument
1930   "\C-l" gnus-recenter
1931   "I" gnus-summary-increase-score
1932   "L" gnus-summary-lower-score
1933   "\M-i" gnus-symbolic-argument
1934   "h" gnus-summary-select-article-buffer
1935
1936   "b" gnus-article-view-part
1937   "\M-t" gnus-summary-toggle-display-buttonized
1938
1939   "V" gnus-summary-score-map
1940   "X" gnus-uu-extract-map
1941   "S" gnus-summary-send-map)
1942
1943 ;; Sort of orthogonal keymap
1944 (gnus-define-keys (gnus-summary-mark-map "M" gnus-summary-mode-map)
1945   "t" gnus-summary-tick-article-forward
1946   "!" gnus-summary-tick-article-forward
1947   "d" gnus-summary-mark-as-read-forward
1948   "r" gnus-summary-mark-as-read-forward
1949   "c" gnus-summary-clear-mark-forward
1950   " " gnus-summary-clear-mark-forward
1951   "e" gnus-summary-mark-as-expirable
1952   "x" gnus-summary-mark-as-expirable
1953   "?" gnus-summary-mark-as-dormant
1954   "b" gnus-summary-set-bookmark
1955   "B" gnus-summary-remove-bookmark
1956   "#" gnus-summary-mark-as-processable
1957   "\M-#" gnus-summary-unmark-as-processable
1958   "S" gnus-summary-limit-include-expunged
1959   "C" gnus-summary-catchup
1960   "H" gnus-summary-catchup-to-here
1961   "h" gnus-summary-catchup-from-here
1962   "\C-c" gnus-summary-catchup-all
1963   "k" gnus-summary-kill-same-subject-and-select
1964   "K" gnus-summary-kill-same-subject
1965   "P" gnus-uu-mark-map)
1966
1967 (gnus-define-keys (gnus-summary-mscore-map "V" gnus-summary-mark-map)
1968   "c" gnus-summary-clear-above
1969   "u" gnus-summary-tick-above
1970   "m" gnus-summary-mark-above
1971   "k" gnus-summary-kill-below)
1972
1973 (gnus-define-keys (gnus-summary-limit-map "/" gnus-summary-mode-map)
1974   "/" gnus-summary-limit-to-subject
1975   "n" gnus-summary-limit-to-articles
1976   "b" gnus-summary-limit-to-bodies
1977   "h" gnus-summary-limit-to-headers
1978   "w" gnus-summary-pop-limit
1979   "s" gnus-summary-limit-to-subject
1980   "a" gnus-summary-limit-to-author
1981   "u" gnus-summary-limit-to-unread
1982   "m" gnus-summary-limit-to-marks
1983   "M" gnus-summary-limit-exclude-marks
1984   "v" gnus-summary-limit-to-score
1985   "*" gnus-summary-limit-include-cached
1986   "D" gnus-summary-limit-include-dormant
1987   "T" gnus-summary-limit-include-thread
1988   "d" gnus-summary-limit-exclude-dormant
1989   "t" gnus-summary-limit-to-age
1990   "." gnus-summary-limit-to-unseen
1991   "x" gnus-summary-limit-to-extra
1992   "p" gnus-summary-limit-to-display-predicate
1993   "E" gnus-summary-limit-include-expunged
1994   "c" gnus-summary-limit-exclude-childless-dormant
1995   "C" gnus-summary-limit-mark-excluded-as-read
1996   "o" gnus-summary-insert-old-articles
1997   "N" gnus-summary-insert-new-articles
1998   "S" gnus-summary-limit-to-singletons
1999   "r" gnus-summary-limit-to-replied
2000   "R" gnus-summary-limit-to-recipient
2001   "A" gnus-summary-limit-to-address)
2002
2003 (gnus-define-keys (gnus-summary-goto-map "G" gnus-summary-mode-map)
2004   "n" gnus-summary-next-unread-article
2005   "p" gnus-summary-prev-unread-article
2006   "N" gnus-summary-next-article
2007   "P" gnus-summary-prev-article
2008   "\C-n" gnus-summary-next-same-subject
2009   "\C-p" gnus-summary-prev-same-subject
2010   "\M-n" gnus-summary-next-unread-subject
2011   "\M-p" gnus-summary-prev-unread-subject
2012   "f" gnus-summary-first-unread-article
2013   "b" gnus-summary-best-unread-article
2014   "j" gnus-summary-goto-article
2015   "g" gnus-summary-goto-subject
2016   "l" gnus-summary-goto-last-article
2017   "o" gnus-summary-pop-article)
2018
2019 (gnus-define-keys (gnus-summary-thread-map "T" gnus-summary-mode-map)
2020   "k" gnus-summary-kill-thread
2021   "E" gnus-summary-expire-thread
2022   "l" gnus-summary-lower-thread
2023   "i" gnus-summary-raise-thread
2024   "T" gnus-summary-toggle-threads
2025   "t" gnus-summary-rethread-current
2026   "^" gnus-summary-reparent-thread
2027   "\M-^" gnus-summary-reparent-children
2028   "s" gnus-summary-show-thread
2029   "S" gnus-summary-show-all-threads
2030   "h" gnus-summary-hide-thread
2031   "H" gnus-summary-hide-all-threads
2032   "n" gnus-summary-next-thread
2033   "p" gnus-summary-prev-thread
2034   "u" gnus-summary-up-thread
2035   "o" gnus-summary-top-thread
2036   "d" gnus-summary-down-thread
2037   "#" gnus-uu-mark-thread
2038   "\M-#" gnus-uu-unmark-thread)
2039
2040 (gnus-define-keys (gnus-summary-buffer-map "Y" gnus-summary-mode-map)
2041   "g" gnus-summary-prepare
2042   "c" gnus-summary-insert-cached-articles
2043   "d" gnus-summary-insert-dormant-articles
2044   "t" gnus-summary-insert-ticked-articles)
2045
2046 (gnus-define-keys (gnus-summary-exit-map "Z" gnus-summary-mode-map)
2047   "c" gnus-summary-catchup-and-exit
2048   "C" gnus-summary-catchup-all-and-exit
2049   "E" gnus-summary-exit-no-update
2050   "Q" gnus-summary-exit
2051   "Z" gnus-summary-exit
2052   "n" gnus-summary-catchup-and-goto-next-group
2053   "p" gnus-summary-catchup-and-goto-prev-group
2054   "R" gnus-summary-reselect-current-group
2055   "G" gnus-summary-rescan-group
2056   "N" gnus-summary-next-group
2057   "s" gnus-summary-save-newsrc
2058   "P" gnus-summary-prev-group)
2059
2060 (gnus-define-keys (gnus-summary-article-map "A" gnus-summary-mode-map)
2061   " " gnus-summary-next-page
2062   "n" gnus-summary-next-page
2063   "\177" gnus-summary-prev-page
2064   [delete] gnus-summary-prev-page
2065   "p" gnus-summary-prev-page
2066   "\r" gnus-summary-scroll-up
2067   "\M-\r" gnus-summary-scroll-down
2068   "<" gnus-summary-beginning-of-article
2069   ">" gnus-summary-end-of-article
2070   "b" gnus-summary-beginning-of-article
2071   "e" gnus-summary-end-of-article
2072   "^" gnus-summary-refer-parent-article
2073   "r" gnus-summary-refer-parent-article
2074   "C" gnus-summary-show-complete-article
2075   "D" gnus-summary-enter-digest-group
2076   "R" gnus-summary-refer-references
2077   "T" gnus-summary-refer-thread
2078   "W" gnus-warp-to-article
2079   "g" gnus-summary-show-article
2080   "s" gnus-summary-isearch-article
2081   [tab] gnus-summary-widget-forward
2082   "P" gnus-summary-print-article
2083   "S" gnus-sticky-article
2084   "M" gnus-mailing-list-insinuate
2085   "t" gnus-article-babel)
2086
2087 (gnus-define-keys (gnus-summary-wash-map "W" gnus-summary-mode-map)
2088   "b" gnus-article-add-buttons
2089   "B" gnus-article-add-buttons-to-head
2090   "o" gnus-article-treat-overstrike
2091   "e" gnus-article-emphasize
2092   "w" gnus-article-fill-cited-article
2093   "Q" gnus-article-fill-long-lines
2094   "L" gnus-article-toggle-truncate-lines
2095   "C" gnus-article-capitalize-sentences
2096   "c" gnus-article-remove-cr
2097   "q" gnus-article-de-quoted-unreadable
2098   "6" gnus-article-de-base64-unreadable
2099   "Z" gnus-article-decode-HZ
2100   "A" gnus-article-treat-ansi-sequences
2101   "h" gnus-article-wash-html
2102   "u" gnus-article-unsplit-urls
2103   "s" gnus-summary-force-verify-and-decrypt
2104   "f" gnus-article-display-x-face
2105   "l" gnus-summary-stop-page-breaking
2106   "r" gnus-summary-caesar-message
2107   "m" gnus-summary-morse-message
2108   "t" gnus-summary-toggle-header
2109   "g" gnus-treat-smiley
2110   "v" gnus-summary-verbose-headers
2111   "a" gnus-article-strip-headers-in-body ;; mnemonic: wash archive
2112   "p" gnus-article-verify-x-pgp-sig
2113   "d" gnus-article-treat-dumbquotes
2114   "U" gnus-article-treat-non-ascii
2115   "i" gnus-summary-idna-message)
2116
2117 (gnus-define-keys (gnus-summary-wash-deuglify-map "Y" gnus-summary-wash-map)
2118   ;; mnemonic: deuglif*Y*
2119   "u" gnus-article-outlook-unwrap-lines
2120   "a" gnus-article-outlook-repair-attribution
2121   "c" gnus-article-outlook-rearrange-citation
2122   "f" gnus-article-outlook-deuglify-article) ;; mnemonic: full deuglify
2123
2124 (gnus-define-keys (gnus-summary-wash-hide-map "W" gnus-summary-wash-map)
2125   "a" gnus-article-hide
2126   "h" gnus-article-hide-headers
2127   "b" gnus-article-hide-boring-headers
2128   "s" gnus-article-hide-signature
2129   "c" gnus-article-hide-citation
2130   "C" gnus-article-hide-citation-in-followups
2131   "l" gnus-article-hide-list-identifiers
2132   "B" gnus-article-strip-banner
2133   "P" gnus-article-hide-pem
2134   "\C-c" gnus-article-hide-citation-maybe)
2135
2136 (gnus-define-keys (gnus-summary-wash-highlight-map "H" gnus-summary-wash-map)
2137   "a" gnus-article-highlight
2138   "h" gnus-article-highlight-headers
2139   "c" gnus-article-highlight-citation
2140   "s" gnus-article-highlight-signature)
2141
2142 (gnus-define-keys (gnus-summary-wash-header-map "G" gnus-summary-wash-map)
2143   "f" gnus-article-treat-fold-headers
2144   "u" gnus-article-treat-unfold-headers
2145   "n" gnus-article-treat-fold-newsgroups)
2146
2147 (gnus-define-keys (gnus-summary-wash-display-map "D" gnus-summary-wash-map)
2148   "x" gnus-article-display-x-face
2149   "d" gnus-article-display-face
2150   "s" gnus-treat-smiley
2151   "D" gnus-article-remove-images
2152   "W" gnus-article-show-images
2153   "f" gnus-treat-from-picon
2154   "m" gnus-treat-mail-picon
2155   "n" gnus-treat-newsgroups-picon
2156   "g" gnus-treat-from-gravatar
2157   "h" gnus-treat-mail-gravatar)
2158
2159 (gnus-define-keys (gnus-summary-wash-mime-map "M" gnus-summary-wash-map)
2160   "w" gnus-article-decode-mime-words
2161   "c" gnus-article-decode-charset
2162   "v" gnus-mime-view-all-parts
2163   "b" gnus-article-view-part)
2164
2165 (gnus-define-keys (gnus-summary-wash-time-map "T" gnus-summary-wash-map)
2166   "z" gnus-article-date-ut
2167   "u" gnus-article-date-ut
2168   "l" gnus-article-date-local
2169   "p" gnus-article-date-english
2170   "e" gnus-article-date-lapsed
2171   "o" gnus-article-date-original
2172   "i" gnus-article-date-iso8601
2173   "s" gnus-article-date-user)
2174
2175 (gnus-define-keys (gnus-summary-wash-empty-map "E" gnus-summary-wash-map)
2176   "t" gnus-article-remove-trailing-blank-lines
2177   "l" gnus-article-strip-leading-blank-lines
2178   "m" gnus-article-strip-multiple-blank-lines
2179   "a" gnus-article-strip-blank-lines
2180   "A" gnus-article-strip-all-blank-lines
2181   "s" gnus-article-strip-leading-space
2182   "e" gnus-article-strip-trailing-space
2183   "w" gnus-article-remove-leading-whitespace)
2184
2185 (gnus-define-keys (gnus-summary-help-map "H" gnus-summary-mode-map)
2186   "v" gnus-version
2187   "d" gnus-summary-describe-group
2188   "h" gnus-summary-describe-briefly
2189   "i" gnus-info-find-node)
2190
2191 (gnus-define-keys (gnus-summary-backend-map "B" gnus-summary-mode-map)
2192   "e" gnus-summary-expire-articles
2193   "\M-\C-e" gnus-summary-expire-articles-now
2194   "\177" gnus-summary-delete-article
2195   [delete] gnus-summary-delete-article
2196   [backspace] gnus-summary-delete-article
2197   "m" gnus-summary-move-article
2198   "r" gnus-summary-respool-article
2199   "w" gnus-summary-edit-article
2200   "c" gnus-summary-copy-article
2201   "B" gnus-summary-crosspost-article
2202   "q" gnus-summary-respool-query
2203   "t" gnus-summary-respool-trace
2204   "i" gnus-summary-import-article
2205   "I" gnus-summary-create-article
2206   "p" gnus-summary-article-posted-p)
2207
2208 (gnus-define-keys (gnus-summary-save-map "O" gnus-summary-mode-map)
2209   "o" gnus-summary-save-article
2210   "m" gnus-summary-save-article-mail
2211   "F" gnus-summary-write-article-file
2212   "r" gnus-summary-save-article-rmail
2213   "f" gnus-summary-save-article-file
2214   "b" gnus-summary-save-article-body-file
2215   "B" gnus-summary-write-article-body-file
2216   "h" gnus-summary-save-article-folder
2217   "v" gnus-summary-save-article-vm
2218   "p" gnus-summary-pipe-output
2219   "P" gnus-summary-muttprint)
2220
2221 (gnus-define-keys (gnus-summary-mime-map "K" gnus-summary-mode-map)
2222   "b" gnus-summary-display-buttonized
2223   "m" gnus-summary-repair-multipart
2224   "v" gnus-article-view-part
2225   "o" gnus-article-save-part
2226   "O" gnus-article-save-part-and-strip
2227   "r" gnus-article-replace-part
2228   "d" gnus-article-delete-part
2229   "t" gnus-article-view-part-as-type
2230   "j" gnus-article-jump-to-part
2231   "c" gnus-article-copy-part
2232   "C" gnus-article-view-part-as-charset
2233   "e" gnus-article-view-part-externally
2234   "H" gnus-article-browse-html-article
2235   "E" gnus-article-encrypt-body
2236   "i" gnus-article-inline-part
2237   "|" gnus-article-pipe-part)
2238
2239 (gnus-define-keys (gnus-uu-mark-map "P" gnus-summary-mark-map)
2240   "p" gnus-summary-mark-as-processable
2241   "u" gnus-summary-unmark-as-processable
2242   "U" gnus-summary-unmark-all-processable
2243   "v" gnus-uu-mark-over
2244   "s" gnus-uu-mark-series
2245   "r" gnus-uu-mark-region
2246   "g" gnus-uu-unmark-region
2247   "R" gnus-uu-mark-by-regexp
2248   "G" gnus-uu-unmark-by-regexp
2249   "t" gnus-uu-mark-thread
2250   "T" gnus-uu-unmark-thread
2251   "a" gnus-uu-mark-all
2252   "b" gnus-uu-mark-buffer
2253   "S" gnus-uu-mark-sparse
2254   "k" gnus-summary-kill-process-mark
2255   "y" gnus-summary-yank-process-mark
2256   "w" gnus-summary-save-process-mark
2257   "i" gnus-uu-invert-processable)
2258
2259 (gnus-define-keys (gnus-uu-extract-map "X" gnus-summary-mode-map)
2260   ;;"x" gnus-uu-extract-any
2261   "m" gnus-summary-save-parts
2262   "u" gnus-uu-decode-uu
2263   "U" gnus-uu-decode-uu-and-save
2264   "s" gnus-uu-decode-unshar
2265   "S" gnus-uu-decode-unshar-and-save
2266   "o" gnus-uu-decode-save
2267   "O" gnus-uu-decode-save
2268   "b" gnus-uu-decode-binhex
2269   "B" gnus-uu-decode-binhex
2270   "Y" gnus-uu-decode-yenc
2271   "p" gnus-uu-decode-postscript
2272   "P" gnus-uu-decode-postscript-and-save)
2273
2274 (gnus-define-keys
2275     (gnus-uu-extract-view-map "v" gnus-uu-extract-map)
2276   "u" gnus-uu-decode-uu-view
2277   "U" gnus-uu-decode-uu-and-save-view
2278   "s" gnus-uu-decode-unshar-view
2279   "S" gnus-uu-decode-unshar-and-save-view
2280   "o" gnus-uu-decode-save-view
2281   "O" gnus-uu-decode-save-view
2282   "b" gnus-uu-decode-binhex-view
2283   "B" gnus-uu-decode-binhex-view
2284   "p" gnus-uu-decode-postscript-view
2285   "P" gnus-uu-decode-postscript-and-save-view)
2286
2287 (defvar gnus-article-post-menu nil)
2288
2289 (defconst gnus-summary-menu-maxlen 20)
2290
2291 (defun gnus-summary-menu-split (menu)
2292   ;; If we have lots of elements, divide them into groups of 20
2293   ;; and make a pane (or submenu) for each one.
2294   (if (> (length menu) (/ (* gnus-summary-menu-maxlen 3) 2))
2295       (let ((menu menu) sublists next
2296             (i 1))
2297         (while menu
2298           ;; Pull off the next gnus-summary-menu-maxlen elements
2299           ;; and make them the next element of sublist.
2300           (setq next (nthcdr gnus-summary-menu-maxlen menu))
2301           (if next
2302               (setcdr (nthcdr (1- gnus-summary-menu-maxlen) menu)
2303                       nil))
2304           (setq sublists (cons (cons (format "%s ... %s" (aref (car menu) 0)
2305                                              (aref (car (last menu)) 0)) menu)
2306                                sublists))
2307           (setq i (1+ i))
2308           (setq menu next))
2309         (nreverse sublists))
2310     ;; Few elements--put them all in one pane.
2311     menu))
2312
2313 (defun gnus-summary-make-menu-bar ()
2314   (gnus-turn-off-edit-menu 'summary)
2315
2316   (unless (boundp 'gnus-summary-misc-menu)
2317
2318     (easy-menu-define
2319       gnus-summary-kill-menu gnus-summary-mode-map ""
2320       (cons
2321        "Score"
2322        (nconc
2323         (list
2324          ["Customize" gnus-score-customize t])
2325         (gnus-make-score-map 'increase)
2326         (gnus-make-score-map 'lower)
2327         '(("Mark"
2328            ["Kill below" gnus-summary-kill-below t]
2329            ["Mark above" gnus-summary-mark-above t]
2330            ["Tick above" gnus-summary-tick-above t]
2331            ["Clear above" gnus-summary-clear-above t])
2332           ["Current score" gnus-summary-current-score t]
2333           ["Set score" gnus-summary-set-score t]
2334           ["Switch current score file..." gnus-score-change-score-file t]
2335           ["Set mark below..." gnus-score-set-mark-below t]
2336           ["Set expunge below..." gnus-score-set-expunge-below t]
2337           ["Edit current score file" gnus-score-edit-current-scores t]
2338           ["Edit score file..." gnus-score-edit-file t]
2339           ["Trace score" gnus-score-find-trace t]
2340           ["Find words" gnus-score-find-favourite-words t]
2341           ["Rescore buffer" gnus-summary-rescore t]
2342           ["Increase score..." gnus-summary-increase-score t]
2343           ["Lower score..." gnus-summary-lower-score t]))))
2344
2345     ;; Define both the Article menu in the summary buffer and the
2346     ;; equivalent Commands menu in the article buffer here for
2347     ;; consistency.
2348     (let ((innards
2349            `(("Hide"
2350               ["All" gnus-article-hide t]
2351               ["Headers" gnus-article-hide-headers t]
2352               ["Signature" gnus-article-hide-signature t]
2353               ["Citation" gnus-article-hide-citation t]
2354               ["List identifiers" gnus-article-hide-list-identifiers t]
2355               ["Banner" gnus-article-strip-banner t]
2356               ["Boring headers" gnus-article-hide-boring-headers t])
2357              ("Highlight"
2358               ["All" gnus-article-highlight t]
2359               ["Headers" gnus-article-highlight-headers t]
2360               ["Signature" gnus-article-highlight-signature t]
2361               ["Citation" gnus-article-highlight-citation t])
2362              ("MIME"
2363               ["Words" gnus-article-decode-mime-words t]
2364               ["Charset" gnus-article-decode-charset t]
2365               ["QP" gnus-article-de-quoted-unreadable t]
2366               ["Base64" gnus-article-de-base64-unreadable t]
2367               ["View MIME buttons" gnus-summary-display-buttonized t]
2368               ["View all" gnus-mime-view-all-parts t]
2369               ["Verify and Decrypt" gnus-summary-force-verify-and-decrypt t]
2370               ["Encrypt body" gnus-article-encrypt-body
2371                :active (not (gnus-group-read-only-p))
2372                ,@(if (featurep 'xemacs) nil
2373                    '(:help "Encrypt the message body on disk"))]
2374               ["Extract all parts..." gnus-summary-save-parts t]
2375               ("Multipart"
2376                ["Repair multipart" gnus-summary-repair-multipart t]
2377                ["Pipe part..." gnus-article-pipe-part t]
2378                ["Inline part" gnus-article-inline-part t]
2379                ["View part as type..." gnus-article-view-part-as-type t]
2380                ["Encrypt body" gnus-article-encrypt-body
2381                 :active (not (gnus-group-read-only-p))
2382                ,@(if (featurep 'xemacs) nil
2383                    '(:help "Encrypt the message body on disk"))]
2384                ["View part externally" gnus-article-view-part-externally t]
2385                ["View HTML parts in browser" gnus-article-browse-html-article t]
2386                ["View part with charset..." gnus-article-view-part-as-charset t]
2387                ["Copy part" gnus-article-copy-part t]
2388                ["Save part..." gnus-article-save-part t]
2389                ["View part" gnus-article-view-part t]))
2390              ("Date"
2391               ["Local" gnus-article-date-local t]
2392               ["ISO8601" gnus-article-date-iso8601 t]
2393               ["UT" gnus-article-date-ut t]
2394               ["Original" gnus-article-date-original t]
2395               ["Lapsed" gnus-article-date-lapsed t]
2396               ["User-defined" gnus-article-date-user t])
2397              ("Display"
2398               ["Remove images" gnus-article-remove-images t]
2399               ["Toggle smiley" gnus-treat-smiley t]
2400               ["Show X-Face" gnus-article-display-x-face t]
2401               ["Show picons in From" gnus-treat-from-picon t]
2402               ["Show picons in mail headers" gnus-treat-mail-picon t]
2403               ["Show picons in news headers" gnus-treat-newsgroups-picon t]
2404               ["Show Gravatars in From" gnus-treat-from-gravatar t]
2405               ["Show Gravatars in mail headers" gnus-treat-mail-gravatar t]
2406               ("View as different encoding"
2407                ,@(gnus-summary-menu-split
2408                   (mapcar
2409                    (lambda (cs)
2410                      ;; Since easymenu under Emacs doesn't allow
2411                      ;; lambda forms for menu commands, we should
2412                      ;; provide intern'ed function symbols.
2413                      (let ((command (intern (format "\
2414 gnus-summary-show-article-from-menu-as-charset-%s" cs))))
2415                        (fset command
2416                              `(lambda ()
2417                                 (interactive)
2418                                 (let ((gnus-summary-show-article-charset-alist
2419                                        '((1 . ,cs))))
2420                                   (gnus-summary-show-article 1))))
2421                        `[,(symbol-name cs) ,command t]))
2422                    (sort (if (fboundp 'coding-system-list)
2423                              (coding-system-list)
2424                            (mapcar 'car mm-mime-mule-charset-alist))
2425                          'string<)))))
2426              ("Washing"
2427               ("Remove Blanks"
2428                ["Leading" gnus-article-strip-leading-blank-lines t]
2429                ["Multiple" gnus-article-strip-multiple-blank-lines t]
2430                ["Trailing" gnus-article-remove-trailing-blank-lines t]
2431                ["All of the above" gnus-article-strip-blank-lines t]
2432                ["All" gnus-article-strip-all-blank-lines t]
2433                ["Leading space" gnus-article-strip-leading-space t]
2434                ["Trailing space" gnus-article-strip-trailing-space t]
2435                ["Leading space in headers"
2436                 gnus-article-remove-leading-whitespace t])
2437               ["Overstrike" gnus-article-treat-overstrike t]
2438               ["Dumb quotes" gnus-article-treat-dumbquotes t]
2439               ["Non-ASCII" gnus-article-treat-non-ascii t]
2440               ["Emphasis" gnus-article-emphasize t]
2441               ["Word wrap" gnus-article-fill-cited-article t]
2442               ["Fill long lines" gnus-article-fill-long-lines t]
2443               ["Toggle truncate long lines" gnus-article-toggle-truncate-lines t]
2444               ["Capitalize sentences" gnus-article-capitalize-sentences t]
2445               ["Remove CR" gnus-article-remove-cr t]
2446               ["Quoted-Printable" gnus-article-de-quoted-unreadable t]
2447               ["Base64" gnus-article-de-base64-unreadable t]
2448               ["Rot 13" gnus-summary-caesar-message
2449                ,@(if (featurep 'xemacs) '(t)
2450                    '(:help "\"Caesar rotate\" article by 13"))]
2451               ["De-IDNA" gnus-summary-idna-message t]
2452               ["Morse decode" gnus-summary-morse-message t]
2453               ["Unix pipe..." gnus-summary-pipe-message t]
2454               ["Add buttons" gnus-article-add-buttons t]
2455               ["Add buttons to head" gnus-article-add-buttons-to-head t]
2456               ["Stop page breaking" gnus-summary-stop-page-breaking t]
2457               ["Verbose header" gnus-summary-verbose-headers t]
2458               ["Toggle header" gnus-summary-toggle-header t]
2459               ["Unfold headers" gnus-article-treat-unfold-headers t]
2460               ["Fold newsgroups" gnus-article-treat-fold-newsgroups t]
2461               ["Html" gnus-article-wash-html t]
2462               ["Unsplit URLs" gnus-article-unsplit-urls t]
2463               ["Verify X-PGP-Sig" gnus-article-verify-x-pgp-sig t]
2464               ["Decode HZ" gnus-article-decode-HZ t]
2465               ["ANSI sequences" gnus-article-treat-ansi-sequences t]
2466               ("(Outlook) Deuglify"
2467                ["Unwrap lines" gnus-article-outlook-unwrap-lines t]
2468                ["Repair attribution" gnus-article-outlook-repair-attribution t]
2469                ["Rearrange citation" gnus-article-outlook-rearrange-citation t]
2470                ["Full (Outlook) deuglify"
2471                 gnus-article-outlook-deuglify-article t])
2472               )
2473              ("Output"
2474               ["Save in default format..." gnus-summary-save-article
2475                ,@(if (featurep 'xemacs) '(t)
2476                    '(:help "Save article using default method"))]
2477               ["Save in file..." gnus-summary-save-article-file
2478                ,@(if (featurep 'xemacs) '(t)
2479                    '(:help "Save article in file"))]
2480               ["Save in Unix mail format..." gnus-summary-save-article-mail t]
2481               ["Save in MH folder..." gnus-summary-save-article-folder t]
2482               ["Save in VM folder..." gnus-summary-save-article-vm t]
2483               ["Save in RMAIL mbox..." gnus-summary-save-article-rmail t]
2484               ["Save body in file..." gnus-summary-save-article-body-file t]
2485               ["Pipe through a filter..." gnus-summary-pipe-output t]
2486               ["Print with Muttprint..." gnus-summary-muttprint t]
2487               ["Print" gnus-summary-print-article
2488                ,@(if (featurep 'xemacs) '(t)
2489                    '(:help "Generate and print a PostScript image"))])
2490              ("Copy, move,... (Backend)"
2491               ,@(if (featurep 'xemacs) nil
2492                   '(:help "Copying, moving, expiring articles..."))
2493               ["Respool article..." gnus-summary-respool-article t]
2494               ["Move article..." gnus-summary-move-article
2495                (gnus-check-backend-function
2496                 'request-move-article gnus-newsgroup-name)]
2497               ["Copy article..." gnus-summary-copy-article t]
2498               ["Crosspost article..." gnus-summary-crosspost-article
2499                (gnus-check-backend-function
2500                 'request-replace-article gnus-newsgroup-name)]
2501               ["Import file..." gnus-summary-import-article
2502                (gnus-check-backend-function
2503                 'request-accept-article gnus-newsgroup-name)]
2504               ["Create article..." gnus-summary-create-article
2505                (gnus-check-backend-function
2506                 'request-accept-article gnus-newsgroup-name)]
2507               ["Check if posted" gnus-summary-article-posted-p t]
2508               ["Edit article" gnus-summary-edit-article
2509                (not (gnus-group-read-only-p))]
2510               ["Delete article" gnus-summary-delete-article
2511                (gnus-check-backend-function
2512                 'request-expire-articles gnus-newsgroup-name)]
2513               ["Query respool" gnus-summary-respool-query t]
2514               ["Trace respool" gnus-summary-respool-trace t]
2515               ["Delete expirable articles" gnus-summary-expire-articles-now
2516                (gnus-check-backend-function
2517                 'request-expire-articles gnus-newsgroup-name)])
2518              ("Extract"
2519               ["Uudecode" gnus-uu-decode-uu
2520                ,@(if (featurep 'xemacs) '(t)
2521                    '(:help "Decode uuencoded article(s)"))]
2522               ["Uudecode and save" gnus-uu-decode-uu-and-save t]
2523               ["Unshar" gnus-uu-decode-unshar t]
2524               ["Unshar and save" gnus-uu-decode-unshar-and-save t]
2525               ["Save" gnus-uu-decode-save t]
2526               ["Binhex" gnus-uu-decode-binhex t]
2527               ["Postscript" gnus-uu-decode-postscript t]
2528               ["All MIME parts" gnus-summary-save-parts t])
2529              ("Cache"
2530               ["Enter article" gnus-cache-enter-article t]
2531               ["Remove article" gnus-cache-remove-article t])
2532              ["Translate" gnus-article-babel t]
2533              ["Select article buffer" gnus-summary-select-article-buffer t]
2534              ["Make article buffer sticky" gnus-sticky-article t]
2535              ["Enter digest buffer" gnus-summary-enter-digest-group t]
2536              ["Isearch article..." gnus-summary-isearch-article t]
2537              ["Beginning of the article" gnus-summary-beginning-of-article t]
2538              ["End of the article" gnus-summary-end-of-article t]
2539              ["Fetch parent of article" gnus-summary-refer-parent-article t]
2540              ["Fetch referenced articles" gnus-summary-refer-references t]
2541              ["Fetch current thread" gnus-summary-refer-thread t]
2542              ["Fetch article with id..." gnus-summary-refer-article t]
2543              ["Setup Mailing List Params" gnus-mailing-list-insinuate t]
2544              ["Redisplay" gnus-summary-show-article t]
2545              ["Raw article" gnus-summary-show-raw-article :keys "C-u g"])))
2546       (easy-menu-define
2547         gnus-summary-article-menu gnus-summary-mode-map ""
2548         (cons "Article" innards))
2549
2550       (if (not (keymapp gnus-summary-article-menu))
2551           (easy-menu-define
2552             gnus-article-commands-menu gnus-article-mode-map ""
2553             (cons "Commands" innards))
2554         ;; in Emacs, don't share menu.
2555         (setq gnus-article-commands-menu
2556               (copy-keymap gnus-summary-article-menu))
2557         (define-key gnus-article-mode-map [menu-bar commands]
2558           (cons "Commands" gnus-article-commands-menu))))
2559
2560     (easy-menu-define
2561       gnus-summary-thread-menu gnus-summary-mode-map ""
2562       '("Threads"
2563         ["Find all messages in thread" gnus-summary-refer-thread t]
2564         ["Toggle threading" gnus-summary-toggle-threads t]
2565         ["Hide threads" gnus-summary-hide-all-threads t]
2566         ["Show threads" gnus-summary-show-all-threads t]
2567         ["Hide thread" gnus-summary-hide-thread t]
2568         ["Show thread" gnus-summary-show-thread t]
2569         ["Go to next thread" gnus-summary-next-thread t]
2570         ["Go to previous thread" gnus-summary-prev-thread t]
2571         ["Go down thread" gnus-summary-down-thread t]
2572         ["Go up thread" gnus-summary-up-thread t]
2573         ["Top of thread" gnus-summary-top-thread t]
2574         ["Mark thread as read" gnus-summary-kill-thread t]
2575         ["Mark thread as expired" gnus-summary-expire-thread t]
2576         ["Lower thread score" gnus-summary-lower-thread t]
2577         ["Raise thread score" gnus-summary-raise-thread t]
2578         ["Rethread current" gnus-summary-rethread-current t]))
2579
2580     (easy-menu-define
2581       gnus-summary-post-menu gnus-summary-mode-map ""
2582       `("Post"
2583         ["Send a message (mail or news)" gnus-summary-post-news
2584          ,@(if (featurep 'xemacs) '(t)
2585              '(:help "Compose a new message (mail or news)"))]
2586         ["Followup" gnus-summary-followup
2587          ,@(if (featurep 'xemacs) '(t)
2588              '(:help "Post followup to this article"))]
2589         ["Followup and yank" gnus-summary-followup-with-original
2590          ,@(if (featurep 'xemacs) '(t)
2591              '(:help "Post followup to this article, quoting its contents"))]
2592         ["Supersede article" gnus-summary-supersede-article t]
2593         ["Cancel article" gnus-summary-cancel-article
2594          ,@(if (featurep 'xemacs) '(t)
2595              '(:help "Cancel an article you posted"))]
2596         ["Reply" gnus-summary-reply t]
2597         ["Reply and yank" gnus-summary-reply-with-original t]
2598         ["Wide reply" gnus-summary-wide-reply t]
2599         ["Wide reply and yank" gnus-summary-wide-reply-with-original
2600          ,@(if (featurep 'xemacs) '(t)
2601              '(:help "Mail a reply, quoting this article"))]
2602         ["Very wide reply" gnus-summary-very-wide-reply t]
2603         ["Very wide reply and yank" gnus-summary-very-wide-reply-with-original
2604          ,@(if (featurep 'xemacs) '(t)
2605              '(:help "Mail a very wide reply, quoting this article"))]
2606         ["Mail forward" gnus-summary-mail-forward t]
2607         ["Post forward" gnus-summary-post-forward t]
2608         ["Digest and mail" gnus-uu-digest-mail-forward t]
2609         ["Digest and post" gnus-uu-digest-post-forward t]
2610         ["Resend message" gnus-summary-resend-message t]
2611         ["Resend message edit" gnus-summary-resend-message-edit t]
2612         ["Send bounced mail" gnus-summary-resend-bounced-mail t]
2613         ["Send a mail" gnus-summary-mail-other-window t]
2614         ["Create a local message" gnus-summary-news-other-window t]
2615         ["Uuencode and post" gnus-uu-post-news
2616          ,@(if (featurep 'xemacs) '(t)
2617              '(:help "Post a uuencoded article"))]
2618         ["Followup via news" gnus-summary-followup-to-mail t]
2619         ["Followup via news and yank"
2620          gnus-summary-followup-to-mail-with-original t]
2621         ["Strip signature on reply"
2622          (lambda ()
2623            (interactive)
2624            (if (not (memq message-cite-function
2625                           '(message-cite-original-without-signature
2626                             message-cite-original)))
2627                ;; Stupid workaround for XEmacs not honoring :visible.
2628                (message "Can't toggle this value of `message-cite-function'")
2629              (setq message-cite-function
2630                    (if (eq message-cite-function
2631                            'message-cite-original-without-signature)
2632                        'message-cite-original
2633                      'message-cite-original-without-signature))))
2634          ;; XEmacs barfs on :visible.
2635          ,@(if (featurep 'xemacs) nil
2636              '(:visible (memq message-cite-function
2637                               '(message-cite-original-without-signature
2638                                 message-cite-original))))
2639          :style toggle
2640          :selected (eq message-cite-function
2641                        'message-cite-original-without-signature)
2642          ,@(if (featurep 'xemacs) nil
2643              '(:help "Strip signature from cited article when replying."))]
2644         ;;("Draft"
2645         ;;["Send" gnus-summary-send-draft t]
2646         ;;["Send bounced" gnus-resend-bounced-mail t])
2647         ))
2648
2649     (cond
2650      ((not (keymapp gnus-summary-post-menu))
2651       (setq gnus-article-post-menu gnus-summary-post-menu))
2652      ((not gnus-article-post-menu)
2653       ;; Don't share post menu.
2654       (setq gnus-article-post-menu
2655             (copy-keymap gnus-summary-post-menu))))
2656     (define-key gnus-article-mode-map [menu-bar post]
2657       (cons "Post" gnus-article-post-menu))
2658
2659     (easy-menu-define
2660       gnus-summary-misc-menu gnus-summary-mode-map ""
2661       `("Gnus"
2662         ("Mark Read"
2663          ["Mark as read" gnus-summary-mark-as-read-forward t]
2664          ["Mark same subject and select"
2665           gnus-summary-kill-same-subject-and-select t]
2666          ["Mark same subject" gnus-summary-kill-same-subject t]
2667          ["Catchup" gnus-summary-catchup
2668           ,@(if (featurep 'xemacs) '(t)
2669               '(:help "Mark unread articles in this group as read"))]
2670          ["Catchup all" gnus-summary-catchup-all t]
2671          ["Catchup to here" gnus-summary-catchup-to-here t]
2672          ["Catchup from here" gnus-summary-catchup-from-here t]
2673          ["Catchup region" gnus-summary-mark-region-as-read
2674           (gnus-mark-active-p)]
2675          ["Mark excluded" gnus-summary-limit-mark-excluded-as-read t])
2676         ("Mark Various"
2677          ["Tick" gnus-summary-tick-article-forward t]
2678          ["Mark as dormant" gnus-summary-mark-as-dormant t]
2679          ["Remove marks" gnus-summary-clear-mark-forward t]
2680          ["Set expirable mark" gnus-summary-mark-as-expirable t]
2681          ["Set bookmark" gnus-summary-set-bookmark t]
2682          ["Remove bookmark" gnus-summary-remove-bookmark t])
2683         ("Limit to"
2684          ["Marks..." gnus-summary-limit-to-marks t]
2685          ["Subject..." gnus-summary-limit-to-subject t]
2686          ["Author..." gnus-summary-limit-to-author t]
2687          ["Recipient..." gnus-summary-limit-to-recipient t]
2688          ["Address..." gnus-summary-limit-to-address t]
2689          ["Age..." gnus-summary-limit-to-age t]
2690          ["Extra..." gnus-summary-limit-to-extra t]
2691          ["Score..." gnus-summary-limit-to-score t]
2692          ["Display Predicate" gnus-summary-limit-to-display-predicate t]
2693          ["Unread" gnus-summary-limit-to-unread t]
2694          ["Unseen" gnus-summary-limit-to-unseen t]
2695          ["Singletons" gnus-summary-limit-to-singletons t]
2696          ["Replied" gnus-summary-limit-to-replied t]
2697          ["Non-dormant" gnus-summary-limit-exclude-dormant t]
2698          ["Next or process marked articles" gnus-summary-limit-to-articles t]
2699          ["Pop limit" gnus-summary-pop-limit t]
2700          ["Show dormant" gnus-summary-limit-include-dormant t]
2701          ["Hide childless dormant"
2702           gnus-summary-limit-exclude-childless-dormant t]
2703          ;;["Hide thread" gnus-summary-limit-exclude-thread t]
2704          ["Hide marked" gnus-summary-limit-exclude-marks t]
2705          ["Show expunged" gnus-summary-limit-include-expunged t])
2706         ("Process Mark"
2707          ["Set mark" gnus-summary-mark-as-processable t]
2708          ["Remove mark" gnus-summary-unmark-as-processable t]
2709          ["Remove all marks" gnus-summary-unmark-all-processable t]
2710          ["Invert marks" gnus-uu-invert-processable t]
2711          ["Mark above" gnus-uu-mark-over t]
2712          ["Mark series" gnus-uu-mark-series t]
2713          ["Mark region" gnus-uu-mark-region (gnus-mark-active-p)]
2714          ["Unmark region" gnus-uu-unmark-region (gnus-mark-active-p)]
2715          ["Mark by regexp..." gnus-uu-mark-by-regexp t]
2716          ["Unmark by regexp..." gnus-uu-unmark-by-regexp t]
2717          ["Mark all" gnus-uu-mark-all t]
2718          ["Mark buffer" gnus-uu-mark-buffer t]
2719          ["Mark sparse" gnus-uu-mark-sparse t]
2720          ["Mark thread" gnus-uu-mark-thread t]
2721          ["Unmark thread" gnus-uu-unmark-thread t]
2722          ("Process Mark Sets"
2723           ["Kill" gnus-summary-kill-process-mark t]
2724           ["Yank" gnus-summary-yank-process-mark
2725            gnus-newsgroup-process-stack]
2726           ["Save" gnus-summary-save-process-mark t]
2727           ["Run command on marked..." gnus-summary-universal-argument t]))
2728         ("Registry Marks")
2729         ("Scroll article"
2730          ["Page forward" gnus-summary-next-page
2731           ,@(if (featurep 'xemacs) '(t)
2732               '(:help "Show next page of article"))]
2733          ["Page backward" gnus-summary-prev-page
2734           ,@(if (featurep 'xemacs) '(t)
2735               '(:help "Show previous page of article"))]
2736          ["Line forward" gnus-summary-scroll-up t])
2737         ("Move"
2738          ["Next unread article" gnus-summary-next-unread-article t]
2739          ["Previous unread article" gnus-summary-prev-unread-article t]
2740          ["Next article" gnus-summary-next-article t]
2741          ["Previous article" gnus-summary-prev-article t]
2742          ["Next unread subject" gnus-summary-next-unread-subject t]
2743          ["Previous unread subject" gnus-summary-prev-unread-subject t]
2744          ["Next article same subject" gnus-summary-next-same-subject t]
2745          ["Previous article same subject" gnus-summary-prev-same-subject t]
2746          ["First unread article" gnus-summary-first-unread-article t]
2747          ["Best unread article" gnus-summary-best-unread-article t]
2748          ["Go to subject number..." gnus-summary-goto-subject t]
2749          ["Go to article number..." gnus-summary-goto-article t]
2750          ["Go to the last article" gnus-summary-goto-last-article t]
2751          ["Pop article off history" gnus-summary-pop-article t])
2752         ("Sort"
2753          ["Sort by number" gnus-summary-sort-by-number t]
2754          ["Sort by most recent number" gnus-summary-sort-by-most-recent-number t]
2755          ["Sort by author" gnus-summary-sort-by-author t]
2756          ["Sort by recipient" gnus-summary-sort-by-recipient t]
2757          ["Sort by subject" gnus-summary-sort-by-subject t]
2758          ["Sort by date" gnus-summary-sort-by-date t]
2759          ["Sort by most recent date" gnus-summary-sort-by-most-recent-date t]
2760          ["Sort by score" gnus-summary-sort-by-score t]
2761          ["Sort by lines" gnus-summary-sort-by-lines t]
2762          ["Sort by characters" gnus-summary-sort-by-chars t]
2763          ["Randomize" gnus-summary-sort-by-random t]
2764          ["Original sort" gnus-summary-sort-by-original t])
2765         ("Help"
2766          ["Describe group" gnus-summary-describe-group t]
2767          ["Read manual" gnus-info-find-node t])
2768         ("Modes"
2769          ["Pick and read" gnus-pick-mode t]
2770          ["Binary" gnus-binary-mode t])
2771         ("Regeneration"
2772          ["Regenerate" gnus-summary-prepare t]
2773          ["Insert cached articles" gnus-summary-insert-cached-articles t]
2774          ["Insert dormant articles" gnus-summary-insert-dormant-articles t]
2775          ["Insert ticked articles" gnus-summary-insert-ticked-articles t]
2776          ["Toggle threading" gnus-summary-toggle-threads t])
2777         ["See old articles" gnus-summary-insert-old-articles t]
2778         ["See new articles" gnus-summary-insert-new-articles t]
2779         ["Filter articles..." gnus-summary-execute-command t]
2780         ["Run command on articles..." gnus-summary-universal-argument t]
2781         ["Search articles forward..." gnus-summary-search-article-forward t]
2782         ["Search articles backward..." gnus-summary-search-article-backward t]
2783         ["Toggle line truncation" gnus-summary-toggle-truncation t]
2784         ["Expand window" gnus-summary-expand-window t]
2785         ["Expire expirable articles" gnus-summary-expire-articles
2786          (gnus-check-backend-function
2787           'request-expire-articles gnus-newsgroup-name)]
2788         ["Edit local kill file" gnus-summary-edit-local-kill t]
2789         ["Edit main kill file" gnus-summary-edit-global-kill t]
2790         ["Edit group parameters" gnus-summary-edit-parameters t]
2791         ["Customize group parameters" gnus-summary-customize-parameters t]
2792         ["Send a bug report" gnus-bug t]
2793         ("Exit"
2794          ["Catchup and exit" gnus-summary-catchup-and-exit
2795           ,@(if (featurep 'xemacs) '(t)
2796               '(:help "Mark unread articles in this group as read, then exit"))]
2797          ["Catchup all and exit" gnus-summary-catchup-all-and-exit t]
2798          ["Catchup and goto next" gnus-summary-catchup-and-goto-next-group t]
2799          ["Catchup and goto prev" gnus-summary-catchup-and-goto-prev-group t]
2800          ["Exit group" gnus-summary-exit
2801           ,@(if (featurep 'xemacs) '(t)
2802               '(:help "Exit current group, return to group selection mode"))]
2803          ["Exit group without updating" gnus-summary-exit-no-update t]
2804          ["Exit and goto next group" gnus-summary-next-group t]
2805          ["Exit and goto prev group" gnus-summary-prev-group t]
2806          ["Reselect group" gnus-summary-reselect-current-group t]
2807          ["Rescan group" gnus-summary-rescan-group t]
2808          ["Update dribble" gnus-summary-save-newsrc t])))
2809
2810     (gnus-run-hooks 'gnus-summary-menu-hook)))
2811
2812 (defvar gnus-summary-tool-bar-map nil)
2813
2814 ;; Note: The :set function in the `gnus-summary-tool-bar*' variables will only
2815 ;; affect _new_ message buffers.  We might add a function that walks thru all
2816 ;; summary-mode buffers and force the update.
2817 (defun gnus-summary-tool-bar-update (&optional symbol value)
2818   "Update summary mode toolbar.
2819 Setter function for custom variables."
2820   (setq-default gnus-summary-tool-bar-map nil)
2821   (when symbol
2822     ;; When used as ":set" function:
2823     (set-default symbol value))
2824   (when (gnus-buffer-live-p gnus-summary-buffer)
2825     (with-current-buffer gnus-summary-buffer
2826       (gnus-summary-make-tool-bar))))
2827
2828 (defcustom gnus-summary-tool-bar (if (eq gmm-tool-bar-style 'gnome)
2829                                      'gnus-summary-tool-bar-gnome
2830                                    'gnus-summary-tool-bar-retro)
2831   "Specifies the Gnus summary tool bar.
2832
2833 It can be either a list or a symbol refering to a list.  See
2834 `gmm-tool-bar-from-list' for the format of the list.  The
2835 default key map is `gnus-summary-mode-map'.
2836
2837 Pre-defined symbols include `gnus-summary-tool-bar-gnome' and
2838 `gnus-summary-tool-bar-retro'."
2839   :type '(choice (const :tag "GNOME style" gnus-summary-tool-bar-gnome)
2840                  (const :tag "Retro look"  gnus-summary-tool-bar-retro)
2841                  (repeat :tag "User defined list" gmm-tool-bar-item)
2842                  (symbol))
2843   :version "23.1" ;; No Gnus
2844   :initialize 'custom-initialize-default
2845   :set 'gnus-summary-tool-bar-update
2846   :group 'gnus-summary)
2847
2848 (defcustom gnus-summary-tool-bar-gnome
2849   '((gnus-summary-post-news "mail/compose" nil)
2850     (gnus-summary-insert-new-articles "mail/inbox" nil
2851                                       :visible (or (not gnus-agent)
2852                                                    gnus-plugged))
2853     (gnus-summary-reply-with-original "mail/reply")
2854     (gnus-summary-reply "mail/reply" nil :visible nil)
2855     (gnus-summary-followup-with-original "mail/reply-all")
2856     (gnus-summary-followup "mail/reply-all" nil :visible nil)
2857     (gnus-summary-mail-forward "mail/forward")
2858     (gnus-summary-save-article "mail/save")
2859     (gnus-summary-search-article-forward "search" nil :visible nil)
2860     (gnus-summary-print-article "print")
2861     (gnus-summary-tick-article-forward "flag-followup" nil :visible nil)
2862     ;; Some new commands that may need more suitable icons:
2863     (gnus-summary-save-newsrc "save" nil :visible nil)
2864     ;; (gnus-summary-show-article "stock_message-display" nil :visible nil)
2865     (gnus-summary-prev-article "left-arrow")
2866     (gnus-summary-next-article "right-arrow")
2867     (gnus-summary-next-page "next-page")
2868     ;; (gnus-summary-enter-digest-group "right_arrow" nil :visible nil)
2869     ;;
2870     ;; Maybe some sort-by-... could be added:
2871     ;; (gnus-summary-sort-by-author "sort-a-z" nil :visible nil)
2872     ;; (gnus-summary-sort-by-date "sort-1-9" nil :visible nil)
2873     (gnus-summary-mark-as-expirable
2874      "delete" nil
2875      :visible (gnus-check-backend-function 'request-expire-articles
2876                                            gnus-newsgroup-name))
2877     (gnus-summary-mark-as-spam
2878      "mail/spam" t
2879      :visible (and (fboundp 'spam-group-ham-contents-p)
2880                    (spam-group-ham-contents-p gnus-newsgroup-name))
2881      :help "Mark as spam")
2882     (gnus-summary-mark-as-read-forward
2883      "mail/not-spam" nil
2884      :visible (and (fboundp 'spam-group-spam-contents-p)
2885                    (spam-group-spam-contents-p gnus-newsgroup-name)))
2886     ;;
2887     (gnus-summary-exit "exit")
2888     (gmm-customize-mode "preferences" t :help "Edit mode preferences")
2889     (gnus-info-find-node "help"))
2890   "List of functions for the summary tool bar (GNOME style).
2891
2892 See `gmm-tool-bar-from-list' for the format of the list."
2893   :type '(repeat gmm-tool-bar-item)
2894   :version "23.1" ;; No Gnus
2895   :initialize 'custom-initialize-default
2896   :set 'gnus-summary-tool-bar-update
2897   :group 'gnus-summary)
2898
2899 (defcustom gnus-summary-tool-bar-retro
2900   '((gnus-summary-prev-unread-article "gnus/prev-ur")
2901     (gnus-summary-next-unread-article "gnus/next-ur")
2902     (gnus-summary-post-news "gnus/post")
2903     (gnus-summary-followup-with-original "gnus/fuwo")
2904     (gnus-summary-followup "gnus/followup")
2905     (gnus-summary-reply-with-original "gnus/reply-wo")
2906     (gnus-summary-reply "gnus/reply")
2907     (gnus-summary-caesar-message "gnus/rot13")
2908     (gnus-uu-decode-uu "gnus/uu-decode")
2909     (gnus-summary-save-article-file "gnus/save-aif")
2910     (gnus-summary-save-article "gnus/save-art")
2911     (gnus-uu-post-news "gnus/uu-post")
2912     (gnus-summary-catchup "gnus/catchup")
2913     (gnus-summary-catchup-and-exit "gnus/cu-exit")
2914     (gnus-summary-exit "gnus/exit-summ")
2915     ;; Some new command that may need more suitable icons:
2916     (gnus-summary-print-article "gnus/print" nil :visible nil)
2917     (gnus-summary-mark-as-expirable "gnus/close" nil :visible nil)
2918     (gnus-summary-save-newsrc "gnus/save" nil :visible nil)
2919     ;; (gnus-summary-enter-digest-group "gnus/right_arrow" nil :visible nil)
2920     (gnus-summary-search-article-forward "gnus/search" nil :visible nil)
2921     ;; (gnus-summary-insert-new-articles "gnus/paste" nil :visible nil)
2922     ;; (gnus-summary-toggle-threads "gnus/open" nil :visible nil)
2923     ;;
2924     (gnus-info-find-node "gnus/help" nil :visible nil))
2925   "List of functions for the summary tool bar (retro look).
2926
2927 See `gmm-tool-bar-from-list' for the format of the list."
2928   :type '(repeat gmm-tool-bar-item)
2929   :version "23.1" ;; No Gnus
2930   :initialize 'custom-initialize-default
2931   :set 'gnus-summary-tool-bar-update
2932   :group 'gnus-summary)
2933
2934 (defcustom gnus-summary-tool-bar-zap-list t
2935   "List of icon items from the global tool bar.
2936 These items are not displayed in the Gnus summary mode tool bar.
2937
2938 See `gmm-tool-bar-from-list' for the format of the list."
2939   :type 'gmm-tool-bar-zap-list
2940   :version "23.1" ;; No Gnus
2941   :initialize 'custom-initialize-default
2942   :set 'gnus-summary-tool-bar-update
2943   :group 'gnus-summary)
2944
2945 (defvar image-load-path)
2946 (defvar tool-bar-map)
2947
2948 (defun gnus-summary-make-tool-bar (&optional force)
2949   "Make a summary mode tool bar from `gnus-summary-tool-bar'.
2950 When FORCE, rebuild the tool bar."
2951   (when (and (not (featurep 'xemacs))
2952              (boundp 'tool-bar-mode)
2953              tool-bar-mode
2954              (or (not gnus-summary-tool-bar-map) force))
2955     (let* ((load-path
2956             (gmm-image-load-path-for-library "gnus"
2957                                              "mail/save.xpm"
2958                                              nil t))
2959            (image-load-path (cons (car load-path)
2960                                   (when (boundp 'image-load-path)
2961                                     image-load-path)))
2962            (map (gmm-tool-bar-from-list gnus-summary-tool-bar
2963                                         gnus-summary-tool-bar-zap-list
2964                                         'gnus-summary-mode-map)))
2965       (when map
2966         ;; Need to set `gnus-summary-tool-bar-map' because `gnus-article-mode'
2967         ;; uses it's value.
2968         (setq gnus-summary-tool-bar-map map))))
2969   (set (make-local-variable 'tool-bar-map) gnus-summary-tool-bar-map))
2970
2971 (defun gnus-score-set-default (var value)
2972   "A version of set that updates the GNU Emacs menu-bar."
2973   (set var value)
2974   ;; It is the message that forces the active status to be updated.
2975   (message ""))
2976
2977 (defun gnus-make-score-map (type)
2978   "Make a summary score map of type TYPE."
2979   (if t
2980       nil
2981     (let ((headers '(("author" "from" string)
2982                      ("subject" "subject" string)
2983                      ("article body" "body" string)
2984                      ("article head" "head" string)
2985                      ("xref" "xref" string)
2986                      ("extra header" "extra" string)
2987                      ("lines" "lines" number)
2988                      ("followups to author" "followup" string)))
2989           (types '((number ("less than" <)
2990                            ("greater than" >)
2991                            ("equal" =))
2992                    (string ("substring" s)
2993                            ("exact string" e)
2994                            ("fuzzy string" f)
2995                            ("regexp" r))))
2996           (perms '(("temporary" (current-time-string))
2997                    ("permanent" nil)
2998                    ("immediate" now)))
2999           header)
3000       (list
3001        (apply
3002         'nconc
3003         (list
3004          (if (eq type 'lower)
3005              "Lower score"
3006            "Increase score"))
3007         (let (outh)
3008           (while headers
3009             (setq header (car headers))
3010             (setq outh
3011                   (cons
3012                    (apply
3013                     'nconc
3014                     (list (car header))
3015                     (let ((ts (cdr (assoc (nth 2 header) types)))
3016                           outt)
3017                       (while ts
3018                         (setq outt
3019                               (cons
3020                                (apply
3021                                 'nconc
3022                                 (list (caar ts))
3023                                 (let ((ps perms)
3024                                       outp)
3025                                   (while ps
3026                                     (setq outp
3027                                           (cons
3028                                            (vector
3029                                             (caar ps)
3030                                             (list
3031                                              'gnus-summary-score-entry
3032                                              (nth 1 header)
3033                                              (if (or (string= (nth 1 header)
3034                                                               "head")
3035                                                      (string= (nth 1 header)
3036                                                               "body"))
3037                                                  ""
3038                                                (list 'gnus-summary-header
3039                                                      (nth 1 header)))
3040                                              (list 'quote (nth 1 (car ts)))
3041                                              (list 'gnus-score-delta-default
3042                                                    nil)
3043                                              (nth 1 (car ps))
3044                                              t)
3045                                             t)
3046                                            outp))
3047                                     (setq ps (cdr ps)))
3048                                   (list (nreverse outp))))
3049                                outt))
3050                         (setq ts (cdr ts)))
3051                       (list (nreverse outt))))
3052                    outh))
3053             (setq headers (cdr headers)))
3054           (list (nreverse outh))))))))
3055
3056
3057 (declare-function turn-on-gnus-mailing-list-mode "gnus-ml" ())
3058 (defvar bookmark-make-record-function)
3059 \f
3060
3061 (defun gnus-summary-mode (&optional group)
3062   "Major mode for reading articles.
3063
3064 All normal editing commands are switched off.
3065 \\<gnus-summary-mode-map>
3066 Each line in this buffer represents one article.  To read an
3067 article, you can, for instance, type `\\[gnus-summary-next-page]'.  To move forwards
3068 and backwards while displaying articles, type `\\[gnus-summary-next-unread-article]' and `\\[gnus-summary-prev-unread-article]',
3069 respectively.
3070
3071 You can also post articles and send mail from this buffer.  To
3072 follow up an article, type `\\[gnus-summary-followup]'.  To mail a reply to the author
3073 of an article, type `\\[gnus-summary-reply]'.
3074
3075 There are approx. one gazillion commands you can execute in this
3076 buffer; read the info pages for more information (`\\[gnus-info-find-node]').
3077
3078 The following commands are available:
3079
3080 \\{gnus-summary-mode-map}"
3081   (interactive)
3082   (kill-all-local-variables)
3083   (let ((gnus-summary-local-variables gnus-newsgroup-variables))
3084     (gnus-summary-make-local-variables))
3085   (gnus-summary-make-local-variables)
3086   (setq gnus-newsgroup-name group)
3087   (when (gnus-visual-p 'summary-menu 'menu)
3088     (gnus-summary-make-menu-bar)
3089     (gnus-summary-make-tool-bar))
3090   (gnus-make-thread-indent-array)
3091   (gnus-simplify-mode-line)
3092   (setq major-mode 'gnus-summary-mode)
3093   (setq mode-name "Summary")
3094   (use-local-map gnus-summary-mode-map)
3095   (buffer-disable-undo)
3096   (setq buffer-read-only t              ;Disable modification
3097         show-trailing-whitespace nil)
3098   (setq truncate-lines t)
3099   (add-to-invisibility-spec '(gnus-sum . t))
3100   (gnus-summary-set-display-table)
3101   (gnus-set-default-directory)
3102   (make-local-variable 'gnus-summary-line-format)
3103   (make-local-variable 'gnus-summary-line-format-spec)
3104   (make-local-variable 'gnus-summary-dummy-line-format)
3105   (make-local-variable 'gnus-summary-dummy-line-format-spec)
3106   (make-local-variable 'gnus-summary-mark-positions)
3107   (gnus-make-local-hook 'pre-command-hook)
3108   (add-hook 'pre-command-hook 'gnus-set-global-variables nil t)
3109   (gnus-run-mode-hooks 'gnus-summary-mode-hook)
3110   (turn-on-gnus-mailing-list-mode)
3111   (mm-enable-multibyte)
3112   (set (make-local-variable 'bookmark-make-record-function)
3113        'gnus-summary-bookmark-make-record)
3114   (gnus-update-format-specifications nil 'summary 'summary-mode 'summary-dummy)
3115   (gnus-update-summary-mark-positions))
3116
3117 (defun gnus-summary-make-local-variables ()
3118   "Make all the local summary buffer variables."
3119   (let (global)
3120     (dolist (local gnus-summary-local-variables)
3121       (if (consp local)
3122           (progn
3123             (if (eq (cdr local) 'global)
3124                 ;; Copy the global value of the variable.
3125                 (setq global (symbol-value (car local)))
3126               ;; Use the value from the list.
3127               (setq global (eval (cdr local))))
3128             (set (make-local-variable (car local)) global))
3129         ;; Simple nil-valued local variable.
3130         (set (make-local-variable local) nil)))))
3131
3132 ;; Summary data functions.
3133
3134 (defmacro gnus-data-number (data)
3135   `(car ,data))
3136
3137 (defmacro gnus-data-set-number (data number)
3138   `(setcar ,data ,number))
3139
3140 (defmacro gnus-data-mark (data)
3141   `(nth 1 ,data))
3142
3143 (defmacro gnus-data-set-mark (data mark)
3144   `(setcar (nthcdr 1 ,data) ,mark))
3145
3146 (defmacro gnus-data-pos (data)
3147   `(nth 2 ,data))
3148
3149 (defmacro gnus-data-set-pos (data pos)
3150   `(setcar (nthcdr 2 ,data) ,pos))
3151
3152 (defmacro gnus-data-header (data)
3153   `(nth 3 ,data))
3154
3155 (defmacro gnus-data-set-header (data header)
3156   `(setf (nth 3 ,data) ,header))
3157
3158 (defmacro gnus-data-level (data)
3159   `(nth 4 ,data))
3160
3161 (defmacro gnus-data-unread-p (data)
3162   `(= (nth 1 ,data) gnus-unread-mark))
3163
3164 (defmacro gnus-data-read-p (data)
3165   `(/= (nth 1 ,data) gnus-unread-mark))
3166
3167 (defmacro gnus-data-pseudo-p (data)
3168   `(consp (nth 3 ,data)))
3169
3170 (defmacro gnus-data-find (number)
3171   `(assq ,number gnus-newsgroup-data))
3172
3173 (defmacro gnus-data-find-list (number &optional data)
3174   `(let ((bdata ,(or data 'gnus-newsgroup-data)))
3175      (memq (assq ,number bdata)
3176            bdata)))
3177
3178 (defmacro gnus-data-make (number mark pos header level)
3179   `(list ,number ,mark ,pos ,header ,level))
3180
3181 (defun gnus-data-enter (after-article number mark pos header level offset)
3182   (let ((data (gnus-data-find-list after-article)))
3183     (unless data
3184       (error "No such article: %d" after-article))
3185     (setcdr data (cons (gnus-data-make number mark pos header level)
3186                        (cdr data)))
3187     (setq gnus-newsgroup-data-reverse nil)
3188     (gnus-data-update-list (cddr data) offset)))
3189
3190 (defun gnus-data-enter-list (after-article list &optional offset)
3191   (when list
3192     (let ((data (and after-article (gnus-data-find-list after-article)))
3193           (ilist list))
3194       (if (not (or data
3195                    after-article))
3196           (let ((odata gnus-newsgroup-data))
3197             (setq gnus-newsgroup-data (nconc list gnus-newsgroup-data))
3198             (when offset
3199               (gnus-data-update-list odata offset)))
3200         ;; Find the last element in the list to be spliced into the main
3201         ;; list.
3202         (setq list (last list))
3203         (if (not data)
3204             (progn
3205               (setcdr list gnus-newsgroup-data)
3206               (setq gnus-newsgroup-data ilist)
3207               (when offset
3208                 (gnus-data-update-list (cdr list) offset)))
3209           (setcdr list (cdr data))
3210           (setcdr data ilist)
3211           (when offset
3212             (gnus-data-update-list (cdr list) offset))))
3213       (setq gnus-newsgroup-data-reverse nil))))
3214
3215 (defun gnus-data-remove (article &optional offset)
3216   (let ((data gnus-newsgroup-data))
3217     (if (= (gnus-data-number (car data)) article)
3218         (progn
3219           (setq gnus-newsgroup-data (cdr gnus-newsgroup-data)
3220                 gnus-newsgroup-data-reverse nil)
3221           (when offset
3222             (gnus-data-update-list gnus-newsgroup-data offset)))
3223       (while (cdr data)
3224         (when (= (gnus-data-number (cadr data)) article)
3225           (setcdr data (cddr data))
3226           (when offset
3227             (gnus-data-update-list (cdr data) offset))
3228           (setq data nil
3229                 gnus-newsgroup-data-reverse nil))
3230         (setq data (cdr data))))))
3231
3232 (defmacro gnus-data-list (backward)
3233   `(if ,backward
3234        (or gnus-newsgroup-data-reverse
3235            (setq gnus-newsgroup-data-reverse
3236                  (reverse gnus-newsgroup-data)))
3237      gnus-newsgroup-data))
3238
3239 (defun gnus-data-update-list (data offset)
3240   "Add OFFSET to the POS of all data entries in DATA."
3241   (setq gnus-newsgroup-data-reverse nil)
3242   (while data
3243     (setcar (nthcdr 2 (car data)) (+ offset (nth 2 (car data))))
3244     (setq data (cdr data))))
3245
3246 (defun gnus-summary-article-pseudo-p (article)
3247   "Say whether this article is a pseudo article or not."
3248   (not (vectorp (gnus-data-header (gnus-data-find article)))))
3249
3250 (defmacro gnus-summary-article-sparse-p (article)
3251   "Say whether this article is a sparse article or not."
3252   `(memq ,article gnus-newsgroup-sparse))
3253
3254 (defmacro gnus-summary-article-ancient-p (article)
3255   "Say whether this article is a sparse article or not."
3256   `(memq ,article gnus-newsgroup-ancient))
3257
3258 (defun gnus-article-parent-p (number)
3259   "Say whether this article is a parent or not."
3260   (let ((data (gnus-data-find-list number)))
3261     (and (cdr data)              ; There has to be an article after...
3262          (< (gnus-data-level (car data)) ; And it has to have a higher level.
3263             (gnus-data-level (nth 1 data))))))
3264
3265 (defun gnus-article-children (number)
3266   "Return a list of all children to NUMBER."
3267   (let* ((data (gnus-data-find-list number))
3268          (level (gnus-data-level (car data)))
3269          children)
3270     (setq data (cdr data))
3271     (while (and data
3272                 (= (gnus-data-level (car data)) (1+ level)))
3273       (push (gnus-data-number (car data)) children)
3274       (setq data (cdr data)))
3275     children))
3276
3277 (defmacro gnus-summary-skip-intangible ()
3278   "If the current article is intangible, then jump to a different article."
3279   '(let ((to (get-text-property (point) 'gnus-intangible)))
3280      (and to (gnus-summary-goto-subject to))))
3281
3282 (defmacro gnus-summary-article-intangible-p ()
3283   "Say whether this article is intangible or not."
3284   '(get-text-property (point) 'gnus-intangible))
3285
3286 (defun gnus-article-read-p (article)
3287   "Say whether ARTICLE is read or not."
3288   (not (or (memq article gnus-newsgroup-marked)
3289            (memq article gnus-newsgroup-spam-marked)
3290            (memq article gnus-newsgroup-unreads)
3291            (memq article gnus-newsgroup-unselected)
3292            (memq article gnus-newsgroup-dormant))))
3293
3294 ;; Some summary mode macros.
3295
3296 (defmacro gnus-summary-article-number ()
3297   "The article number of the article on the current line.
3298 If there isn't an article number here, then we return the current
3299 article number."
3300   '(progn
3301      (gnus-summary-skip-intangible)
3302      (or (get-text-property (point) 'gnus-number)
3303          (gnus-summary-last-subject))))
3304
3305 (defmacro gnus-summary-article-header (&optional number)
3306   "Return the header of article NUMBER."
3307   `(gnus-data-header (gnus-data-find
3308                       ,(or number '(gnus-summary-article-number)))))
3309
3310 (defmacro gnus-summary-thread-level (&optional number)
3311   "Return the level of thread that starts with article NUMBER."
3312   `(if (and (eq gnus-summary-make-false-root 'dummy)
3313             (get-text-property (point) 'gnus-intangible))
3314        0
3315      (gnus-data-level (gnus-data-find
3316                        ,(or number '(gnus-summary-article-number))))))
3317
3318 (defmacro gnus-summary-article-mark (&optional number)
3319   "Return the mark of article NUMBER."
3320   `(gnus-data-mark (gnus-data-find
3321                     ,(or number '(gnus-summary-article-number)))))
3322
3323 (defmacro gnus-summary-article-pos (&optional number)
3324   "Return the position of the line of article NUMBER."
3325   `(gnus-data-pos (gnus-data-find
3326                    ,(or number '(gnus-summary-article-number)))))
3327
3328 (defalias 'gnus-summary-subject-string 'gnus-summary-article-subject)
3329 (defmacro gnus-summary-article-subject (&optional number)
3330   "Return current subject string or nil if nothing."
3331   `(let ((headers
3332           ,(if number
3333                `(gnus-data-header (assq ,number gnus-newsgroup-data))
3334              '(gnus-data-header (assq (gnus-summary-article-number)
3335                                       gnus-newsgroup-data)))))
3336      (and headers
3337           (vectorp headers)
3338           (mail-header-subject headers))))
3339
3340 (defmacro gnus-summary-article-score (&optional number)
3341   "Return current article score."
3342   `(or (cdr (assq ,(or number '(gnus-summary-article-number))
3343                   gnus-newsgroup-scored))
3344        gnus-summary-default-score 0))
3345
3346 (defun gnus-summary-article-children (&optional number)
3347   "Return a list of article numbers that are children of article NUMBER."
3348   (let* ((data (gnus-data-find-list (or number (gnus-summary-article-number))))
3349          (level (gnus-data-level (car data)))
3350          l children)
3351     (while (and (setq data (cdr data))
3352                 (> (setq l (gnus-data-level (car data))) level))
3353       (and (= (1+ level) l)
3354            (push (gnus-data-number (car data))
3355                  children)))
3356     (nreverse children)))
3357
3358 (defun gnus-summary-article-parent (&optional number)
3359   "Return the article number of the parent of article NUMBER."
3360   (let* ((data (gnus-data-find-list (or number (gnus-summary-article-number))
3361                                     (gnus-data-list t)))
3362          (level (gnus-data-level (car data))))
3363     (if (zerop level)
3364         ()                              ; This is a root.
3365       ;; We search until we find an article with a level less than
3366       ;; this one.  That function has to be the parent.
3367       (while (and (setq data (cdr data))
3368                   (not (< (gnus-data-level (car data)) level))))
3369       (and data (gnus-data-number (car data))))))
3370
3371 (defun gnus-unread-mark-p (mark)
3372   "Say whether MARK is the unread mark."
3373   (= mark gnus-unread-mark))
3374
3375 (defun gnus-read-mark-p (mark)
3376   "Say whether MARK is one of the marks that mark as read.
3377 This is all marks except unread, ticked, dormant, and expirable."
3378   (not (or (= mark gnus-unread-mark)
3379            (= mark gnus-ticked-mark)
3380            (= mark gnus-spam-mark)
3381            (= mark gnus-dormant-mark)
3382            (= mark gnus-expirable-mark))))
3383
3384 (defmacro gnus-article-mark (number)
3385   "Return the MARK of article NUMBER.
3386 This macro should only be used when computing the mark the \"first\"
3387 time; i.e., when generating the summary lines.  After that,
3388 `gnus-summary-article-mark' should be used to examine the
3389 marks of articles."
3390   `(cond
3391     ((memq ,number gnus-newsgroup-unsendable) gnus-unsendable-mark)
3392     ((memq ,number gnus-newsgroup-downloadable) gnus-downloadable-mark)
3393     ((memq ,number gnus-newsgroup-unreads) gnus-unread-mark)
3394     ((memq ,number gnus-newsgroup-marked) gnus-ticked-mark)
3395     ((memq ,number gnus-newsgroup-spam-marked) gnus-spam-mark)
3396     ((memq ,number gnus-newsgroup-dormant) gnus-dormant-mark)
3397     ((memq ,number gnus-newsgroup-expirable) gnus-expirable-mark)
3398     (t (or (cdr (assq ,number gnus-newsgroup-reads))
3399            gnus-ancient-mark))))
3400
3401 ;; Saving hidden threads.
3402
3403 (defmacro gnus-save-hidden-threads (&rest forms)
3404   "Save hidden threads, eval FORMS, and restore the hidden threads."
3405   (let ((config (make-symbol "config")))
3406     `(let ((,config (gnus-hidden-threads-configuration)))
3407        (unwind-protect
3408            (save-excursion
3409              ,@forms)
3410          (gnus-restore-hidden-threads-configuration ,config)))))
3411 (put 'gnus-save-hidden-threads 'lisp-indent-function 0)
3412 (put 'gnus-save-hidden-threads 'edebug-form-spec '(body))
3413
3414 (defun gnus-data-compute-positions ()
3415   "Compute the positions of all articles."
3416   (setq gnus-newsgroup-data-reverse nil)
3417   (let ((data gnus-newsgroup-data))
3418     (save-excursion
3419       (gnus-save-hidden-threads
3420         (gnus-summary-show-all-threads)
3421         (goto-char (point-min))
3422         (while data
3423           (while (get-text-property (point) 'gnus-intangible)
3424             (forward-line 1))
3425           (gnus-data-set-pos (car data) (+ (point) 3))
3426           (setq data (cdr data))
3427           (forward-line 1))))))
3428
3429 (defun gnus-hidden-threads-configuration ()
3430   "Return the current hidden threads configuration."
3431   (save-excursion
3432     (let (config)
3433       (goto-char (point-min))
3434       (while (not (eobp))
3435         (when (eq (get-char-property (point-at-eol) 'invisible) 'gnus-sum)
3436           (push (save-excursion (forward-line 0) (point)) config))
3437         (forward-line 1))
3438       config)))
3439
3440 (defun gnus-restore-hidden-threads-configuration (config)
3441   "Restore hidden threads configuration from CONFIG."
3442   (save-excursion
3443     (let (point (inhibit-read-only t))
3444       (while (setq point (pop config))
3445         (goto-char point)
3446         (gnus-summary-hide-thread)))))
3447
3448 ;; Various summary mode internalish functions.
3449
3450 (defun gnus-mouse-pick-article (e)
3451   (interactive "e")
3452   (mouse-set-point e)
3453   (gnus-summary-next-page nil t))
3454
3455 (defun gnus-summary-set-display-table ()
3456   "Change the display table.
3457 Odd characters have a tendency to mess
3458 up nicely formatted displays - we make all possible glyphs
3459 display only a single character."
3460
3461   ;; We start from the standard display table, if any.
3462   (let ((table (or (copy-sequence standard-display-table)
3463                    (make-display-table)))
3464         (i 32))
3465     ;; Nix out all the control chars...
3466     (while (>= (setq i (1- i)) 0)
3467       (gnus-put-display-table i [??] table))
3468    ;; ... but not newline and cr, of course.  (cr is necessary for the
3469     ;; selective display).
3470     (gnus-put-display-table ?\n nil table)
3471     (gnus-put-display-table ?\r nil table)
3472     ;; We keep TAB as well.
3473     (gnus-put-display-table ?\t nil table)
3474     ;; We nix out any glyphs 127 through 255, or 127 through 159 in
3475     ;; Emacs 23 (unicode), that are not set already.
3476     (let ((i (if (ignore-errors (= (make-char 'latin-iso8859-1 160) 160))
3477                  160
3478                256)))
3479       (while (>= (setq i (1- i)) 127)
3480         ;; Only modify if the entry is nil.
3481         (unless (gnus-get-display-table i table)
3482           (gnus-put-display-table i [??] table))))
3483     (setq buffer-display-table table)))
3484
3485 (defun gnus-summary-set-article-display-arrow (pos)
3486   "Update the overlay arrow to point to line at position POS."
3487   (when gnus-summary-display-arrow
3488     (make-local-variable 'overlay-arrow-position)
3489     (make-local-variable 'overlay-arrow-string)
3490     (save-excursion
3491       (goto-char pos)
3492       (beginning-of-line)
3493       (unless overlay-arrow-position
3494         (setq overlay-arrow-position (make-marker)))
3495       (setq overlay-arrow-string "=>"
3496             overlay-arrow-position (set-marker overlay-arrow-position
3497                                                (point)
3498                                                (current-buffer))))))
3499
3500 (defun gnus-summary-setup-buffer (group)
3501   "Initialize summary buffer."
3502   (let ((buffer (gnus-summary-buffer-name group))
3503         (dead-name (concat "*Dead Summary "
3504                            (gnus-group-decoded-name group) "*")))
3505     ;; If a dead summary buffer exists, we kill it.
3506     (when (gnus-buffer-live-p dead-name)
3507       (gnus-kill-buffer dead-name))
3508     (if (get-buffer buffer)
3509         (progn
3510           (set-buffer buffer)
3511           (setq gnus-summary-buffer (current-buffer))
3512           (not gnus-newsgroup-prepared))
3513       ;; Fix by Sudish Joseph <joseph@cis.ohio-state.edu>
3514       (setq gnus-summary-buffer (set-buffer (gnus-get-buffer-create buffer)))
3515       (gnus-summary-mode group)
3516       (when (gnus-group-quit-config group)
3517         (set (make-local-variable 'gnus-single-article-buffer) nil))
3518       (make-local-variable 'gnus-article-buffer)
3519       (make-local-variable 'gnus-article-current)
3520       (make-local-variable 'gnus-original-article-buffer)
3521       (setq gnus-newsgroup-name group)
3522       ;; Set any local variables in the group parameters.
3523       (gnus-summary-set-local-parameters gnus-newsgroup-name)
3524       t)))
3525
3526 (defun gnus-set-global-variables ()
3527   "Set the global equivalents of the buffer-local variables.
3528 They are set to the latest values they had.  These reflect the summary
3529 buffer that was in action when the last article was fetched."
3530   (when (eq major-mode 'gnus-summary-mode)
3531     (setq gnus-summary-buffer (current-buffer))
3532     (let ((name gnus-newsgroup-name)
3533           (marked gnus-newsgroup-marked)
3534           (spam gnus-newsgroup-spam-marked)
3535           (unread gnus-newsgroup-unreads)
3536           (headers gnus-current-headers)
3537           (data gnus-newsgroup-data)
3538           (summary gnus-summary-buffer)
3539           (article-buffer gnus-article-buffer)
3540           (original gnus-original-article-buffer)
3541           (gac gnus-article-current)
3542           (reffed gnus-reffed-article-number)
3543           (score-file gnus-current-score-file)
3544           (default-charset gnus-newsgroup-charset)
3545           vlist)
3546       (let ((locals gnus-newsgroup-variables))
3547         (while locals
3548           (if (consp (car locals))
3549               (push (eval (caar locals)) vlist)
3550             (push (eval (car locals)) vlist))
3551           (setq locals (cdr locals)))
3552         (setq vlist (nreverse vlist)))
3553       (with-current-buffer gnus-group-buffer
3554         (setq gnus-newsgroup-name name
3555               gnus-newsgroup-marked marked
3556               gnus-newsgroup-spam-marked spam
3557               gnus-newsgroup-unreads unread
3558               gnus-current-headers headers
3559               gnus-newsgroup-data data
3560               gnus-article-current gac
3561               gnus-summary-buffer summary
3562               gnus-article-buffer article-buffer
3563               gnus-original-article-buffer original
3564               gnus-reffed-article-number reffed
3565               gnus-current-score-file score-file
3566               gnus-newsgroup-charset default-charset)
3567         (let ((locals gnus-newsgroup-variables))
3568           (while locals
3569             (if (consp (car locals))
3570                 (set (caar locals) (pop vlist))
3571               (set (car locals) (pop vlist)))
3572             (setq locals (cdr locals))))
3573         ;; The article buffer also has local variables.
3574         (when (gnus-buffer-live-p gnus-article-buffer)
3575           (set-buffer gnus-article-buffer)
3576           (setq gnus-summary-buffer summary))))))
3577
3578 (defun gnus-summary-article-unread-p (article)
3579   "Say whether ARTICLE is unread or not."
3580   (memq article gnus-newsgroup-unreads))
3581
3582 (defun gnus-summary-first-article-p (&optional article)
3583   "Return whether ARTICLE is the first article in the buffer."
3584   (if (not (setq article (or article (gnus-summary-article-number))))
3585       nil
3586     (eq article (caar gnus-newsgroup-data))))
3587
3588 (defun gnus-summary-last-article-p (&optional article)
3589   "Return whether ARTICLE is the last article in the buffer."
3590   (if (not (setq article (or article (gnus-summary-article-number))))
3591       ;; All non-existent numbers are the last article.  :-)
3592       t
3593     (not (cdr (gnus-data-find-list article)))))
3594
3595 (defun gnus-make-thread-indent-array (&optional n)
3596   (when (or n
3597             (progn (setq n 200) nil)
3598             (null gnus-thread-indent-array)
3599             (/= gnus-thread-indent-level gnus-thread-indent-array-level))
3600     (setq gnus-thread-indent-array (make-vector (1+ n) "")
3601           gnus-thread-indent-array-level gnus-thread-indent-level)
3602     (while (>= n 0)
3603       (aset gnus-thread-indent-array n
3604             (make-string (* n gnus-thread-indent-level) ? ))
3605       (setq n (1- n)))))
3606
3607 (defun gnus-update-summary-mark-positions ()
3608   "Compute where the summary marks are to go."
3609   (save-excursion
3610     (when (gnus-buffer-exists-p gnus-summary-buffer)
3611       (set-buffer gnus-summary-buffer))
3612     (let ((spec gnus-summary-line-format-spec)
3613           pos)
3614       (save-excursion
3615         (gnus-set-work-buffer)
3616         (let ((gnus-tmp-unread ?Z)
3617               (gnus-replied-mark ?Z)
3618               (gnus-score-below-mark ?Z)
3619               (gnus-score-over-mark ?Z)
3620               (gnus-undownloaded-mark ?Z)
3621               (gnus-summary-line-format-spec spec)
3622               (gnus-newsgroup-downloadable '(0))
3623               (header [0 "" "" "05 Apr 2001 23:33:09 +0400" "" "" 0 0 "" nil])
3624               case-fold-search ignores)
3625           ;; Here, all marks are bound to Z.
3626           (gnus-summary-insert-line header
3627                                     0 nil t gnus-tmp-unread t nil "" nil 1)
3628           (goto-char (point-min))
3629           ;; Memorize the positions of the same characters as dummy marks.
3630           (while (re-search-forward "[A-D]" nil t)
3631             (push (point) ignores))
3632           (erase-buffer)
3633           ;; We use A-D as dummy marks in order to know column positions
3634           ;; where marks should be inserted.
3635           (setq gnus-tmp-unread ?A
3636                 gnus-replied-mark ?B
3637                 gnus-score-below-mark ?C
3638                 gnus-score-over-mark ?C
3639                 gnus-undownloaded-mark ?D)
3640           (gnus-summary-insert-line header
3641                                     0 nil t gnus-tmp-unread t nil "" nil 1)
3642           ;; Ignore characters which aren't dummy marks.
3643           (dolist (p ignores)
3644             (delete-region (goto-char (1- p)) p)
3645             (insert ?Z))
3646           (goto-char (point-min))
3647           (setq pos (list (cons 'unread
3648                                 (and (search-forward "A" nil t)
3649                                      (- (point) (point-min) 1)))))
3650           (goto-char (point-min))
3651           (push (cons 'replied (and (search-forward "B" nil t)
3652                                     (- (point) (point-min) 1)))
3653                 pos)
3654           (goto-char (point-min))
3655           (push (cons 'score (and (search-forward "C" nil t)
3656                                   (- (point) (point-min) 1)))
3657                 pos)
3658           (goto-char (point-min))
3659           (push (cons 'download (and (search-forward "D" nil t)
3660                                      (- (point) (point-min) 1)))
3661                 pos)))
3662       (setq gnus-summary-mark-positions pos))))
3663
3664 (defun gnus-summary-insert-dummy-line (gnus-tmp-subject gnus-tmp-number)
3665   "Insert a dummy root in the summary buffer."
3666   (beginning-of-line)
3667   (gnus-add-text-properties
3668    (point) (progn (eval gnus-summary-dummy-line-format-spec) (point))
3669    (list 'gnus-number gnus-tmp-number 'gnus-intangible gnus-tmp-number)))
3670
3671 (defun gnus-summary-extract-address-component (from)
3672   (or (car (funcall gnus-extract-address-components from))
3673       from))
3674
3675 (defun gnus-summary-from-or-to-or-newsgroups (header gnus-tmp-from)
3676   (let ((mail-parse-charset gnus-newsgroup-charset)
3677         (ignored-from-addresses (gnus-ignored-from-addresses))
3678         ; Is it really necessary to do this next part for each summary line?
3679         ; Luckily, doesn't seem to slow things down much.
3680         (mail-parse-ignored-charsets
3681          (with-current-buffer gnus-summary-buffer
3682            gnus-newsgroup-ignored-charsets)))
3683     (or
3684      (and ignored-from-addresses
3685           (string-match ignored-from-addresses gnus-tmp-from)
3686           (let ((extra-headers (mail-header-extra header))
3687                 to
3688                 newsgroups)
3689             (cond
3690              ((setq to (cdr (assq 'To extra-headers)))
3691               (concat gnus-summary-to-prefix
3692                       (inline
3693                         (gnus-summary-extract-address-component
3694                          (funcall gnus-decode-encoded-address-function to)))))
3695              ((setq newsgroups
3696                     (or
3697                      (cdr (assq 'Newsgroups extra-headers))
3698                      (and
3699                       (memq 'Newsgroups gnus-extra-headers)
3700                       (eq (car (gnus-find-method-for-group
3701                                 gnus-newsgroup-name)) 'nntp)
3702                       (gnus-group-real-name gnus-newsgroup-name))))
3703               (concat gnus-summary-newsgroup-prefix newsgroups)))))
3704      (inline (gnus-summary-extract-address-component gnus-tmp-from)))))
3705
3706 (defun gnus-summary-insert-line (gnus-tmp-header
3707                                  gnus-tmp-level gnus-tmp-current
3708                                  undownloaded gnus-tmp-unread gnus-tmp-replied
3709                                  gnus-tmp-expirable gnus-tmp-subject-or-nil
3710                                  &optional gnus-tmp-dummy gnus-tmp-score
3711                                  gnus-tmp-process)
3712   (if (>= gnus-tmp-level (length gnus-thread-indent-array))
3713       (gnus-make-thread-indent-array (max (* 2 (length gnus-thread-indent-array))
3714                                           gnus-tmp-level)))
3715   (let* ((gnus-tmp-indentation (aref gnus-thread-indent-array gnus-tmp-level))
3716          (gnus-tmp-lines (mail-header-lines gnus-tmp-header))
3717          (gnus-tmp-score (or gnus-tmp-score gnus-summary-default-score 0))
3718          (gnus-tmp-score-char
3719           (if (or (null gnus-summary-default-score)
3720                   (<= (abs (- gnus-tmp-score gnus-summary-default-score))
3721                       gnus-summary-zcore-fuzz))
3722               ?                         ;Whitespace
3723             (if (< gnus-tmp-score gnus-summary-default-score)
3724                 gnus-score-below-mark gnus-score-over-mark)))
3725          (gnus-tmp-number (mail-header-number gnus-tmp-header))
3726          (gnus-tmp-replied
3727           (cond (gnus-tmp-process gnus-process-mark)
3728                 ((memq gnus-tmp-current gnus-newsgroup-cached)
3729                  gnus-cached-mark)
3730                 (gnus-tmp-replied gnus-replied-mark)
3731                 ((memq gnus-tmp-current gnus-newsgroup-forwarded)
3732                  gnus-forwarded-mark)
3733                 ((memq gnus-tmp-current gnus-newsgroup-saved)
3734                  gnus-saved-mark)
3735                 ((memq gnus-tmp-number gnus-newsgroup-recent)
3736                  gnus-recent-mark)
3737                 ((memq gnus-tmp-number gnus-newsgroup-unseen)
3738                  gnus-unseen-mark)
3739                 (t gnus-no-mark)))
3740          (gnus-tmp-downloaded
3741           (cond (undownloaded
3742                  gnus-undownloaded-mark)
3743                 (gnus-newsgroup-agentized
3744                  gnus-downloaded-mark)
3745                 (t
3746                  gnus-no-mark)))
3747          (gnus-tmp-from (mail-header-from gnus-tmp-header))
3748          (gnus-tmp-name
3749           (cond
3750            ((string-match "<[^>]+> *$" gnus-tmp-from)
3751             (let ((beg (match-beginning 0)))
3752               (or (and (string-match "^\".+\"" gnus-tmp-from)
3753                        (substring gnus-tmp-from 1 (1- (match-end 0))))
3754                   (substring gnus-tmp-from 0 beg))))
3755            ((string-match "(.+)" gnus-tmp-from)
3756             (substring gnus-tmp-from
3757                        (1+ (match-beginning 0)) (1- (match-end 0))))
3758            (t gnus-tmp-from)))
3759          (gnus-tmp-subject (mail-header-subject gnus-tmp-header))
3760          (gnus-tmp-opening-bracket (if gnus-tmp-dummy ?\< ?\[))
3761          (gnus-tmp-closing-bracket (if gnus-tmp-dummy ?\> ?\]))
3762          (inhibit-read-only t))
3763     (when (string= gnus-tmp-name "")
3764       (setq gnus-tmp-name gnus-tmp-from))
3765     (unless (numberp gnus-tmp-lines)
3766       (setq gnus-tmp-lines -1))
3767     (if (= gnus-tmp-lines -1)
3768         (setq gnus-tmp-lines "?")
3769       (setq gnus-tmp-lines (number-to-string gnus-tmp-lines)))
3770     (condition-case ()
3771         (gnus-put-text-property
3772          (point)
3773          (progn (eval gnus-summary-line-format-spec) (point))
3774          'gnus-number gnus-tmp-number)
3775       (error (gnus-message 5 "Error updating the summary line")))
3776     (when (gnus-visual-p 'summary-highlight 'highlight)
3777       (forward-line -1)
3778       (gnus-summary-highlight-line)
3779       (gnus-run-hooks 'gnus-summary-update-hook)
3780       (forward-line 1))))
3781
3782 (defun gnus-summary-update-line (&optional dont-update)
3783   "Update summary line after change."
3784   (when (and gnus-summary-default-score
3785              (not gnus-summary-inhibit-highlight))
3786     (let* ((gnus-summary-inhibit-highlight t) ; Prevent recursion.
3787            (article (gnus-summary-article-number))
3788            (score (gnus-summary-article-score article)))
3789       (unless dont-update
3790         (if (and gnus-summary-mark-below
3791                  (< (gnus-summary-article-score)
3792                     gnus-summary-mark-below))
3793             ;; This article has a low score, so we mark it as read.
3794             (when (memq article gnus-newsgroup-unreads)
3795               (gnus-summary-mark-article-as-read gnus-low-score-mark))
3796           (when (eq (gnus-summary-article-mark) gnus-low-score-mark)
3797             ;; This article was previously marked as read on account
3798             ;; of a low score, but now it has risen, so we mark it as
3799             ;; unread.
3800             (gnus-summary-mark-article-as-unread gnus-unread-mark)))
3801         (gnus-summary-update-mark
3802          (if (or (null gnus-summary-default-score)
3803                  (<= (abs (- score gnus-summary-default-score))
3804                      gnus-summary-zcore-fuzz))
3805              ?                          ;Whitespace
3806            (if (< score gnus-summary-default-score)
3807                gnus-score-below-mark gnus-score-over-mark))
3808          'score))
3809       ;; Do visual highlighting.
3810       (when (gnus-visual-p 'summary-highlight 'highlight)
3811         (gnus-summary-highlight-line)
3812         (gnus-run-hooks 'gnus-summary-update-hook)))))
3813
3814 (defvar gnus-tmp-new-adopts nil)
3815
3816 (defun gnus-summary-number-of-articles-in-thread (thread &optional level char)
3817   "Return the number of articles in THREAD.
3818 This may be 0 in some cases -- if none of the articles in
3819 the thread are to be displayed."
3820   (let* ((number
3821          ;; Fix by Luc Van Eycken <Luc.VanEycken@esat.kuleuven.ac.be>.
3822           (cond
3823            ((not (listp thread))
3824             1)
3825            ((and (consp thread) (cdr thread))
3826             (apply
3827              '+ 1 (mapcar
3828                    'gnus-summary-number-of-articles-in-thread (cdr thread))))
3829            ((null thread)
3830             1)
3831            ((memq (mail-header-number (car thread)) gnus-newsgroup-limit)
3832             1)
3833            (t 0))))
3834     (when (and level (zerop level) gnus-tmp-new-adopts)
3835       (incf number
3836             (apply '+ (mapcar
3837                        'gnus-summary-number-of-articles-in-thread
3838                        gnus-tmp-new-adopts))))
3839     (if char
3840         (if (> number 1) gnus-not-empty-thread-mark
3841           gnus-empty-thread-mark)
3842       number)))
3843
3844 (defsubst gnus-summary-line-message-size (head)
3845   "Return pretty-printed version of message size.
3846 This function is intended to be used in
3847 `gnus-summary-line-format-alist'."
3848   (let ((c (or (mail-header-chars head) -1)))
3849     (cond ((< c 0) "n/a")               ; chars not available
3850           ((< c (* 1000 10)) (format "%1.1fk" (/ c 1024.0)))
3851           ((< c (* 1000 100)) (format "%dk" (/ c 1024.0)))
3852           ((< c (* 1000 10000)) (format "%1.1fM" (/ c (* 1024.0 1024))))
3853           (t (format "%dM" (/ c (* 1024.0 1024)))))))
3854
3855
3856 (defun gnus-summary-set-local-parameters (group)
3857   "Go through the local params of GROUP and set all variable specs in that list."
3858   (let ((vars '(quit-config active)))   ; Ignore things that aren't
3859                                         ; really variables.
3860     (dolist (elem (gnus-group-find-parameter group))
3861       (and (consp elem)                 ; Has to be a cons.
3862            (consp (cdr elem))           ; The cdr has to be a list.
3863            (symbolp (car elem))         ; Has to be a symbol in there.
3864            (not (memq (car elem) vars))
3865            (ignore-errors
3866              (push (car elem) vars)
3867              ;; Variables like `gnus-show-threads' that are globally
3868              ;; bound, if used as group parameters, need to get to be
3869              ;; buffer-local, whereas just parameters like `gcc-self',
3870              ;; `timestamp', etc. should not be bound as variables.
3871              (if (boundp (car elem))
3872                  (set (make-local-variable (car elem)) (eval (nth 1 elem)))
3873                (eval (nth 1 elem))))))))
3874
3875 (defun gnus-summary-read-group (group &optional show-all no-article
3876                                       kill-buffer no-display backward
3877                                       select-articles)
3878   "Start reading news in newsgroup GROUP.
3879 If SHOW-ALL is non-nil, already read articles are also listed.
3880 If NO-ARTICLE is non-nil, no article is selected initially.
3881 If NO-DISPLAY, don't generate a summary buffer."
3882   (let (result)
3883     (while (and group
3884                 (null (setq result
3885                             (let ((gnus-auto-select-next nil))
3886                               (or (gnus-summary-read-group-1
3887                                    group show-all no-article
3888                                    kill-buffer no-display
3889                                    select-articles)
3890                                   (setq show-all nil
3891                                         select-articles nil)))))
3892                 (eq gnus-auto-select-next 'quietly))
3893       (set-buffer gnus-group-buffer)
3894       ;; The entry function called above goes to the next
3895       ;; group automatically, so we go two groups back
3896       ;; if we are searching for the previous group.
3897       (when backward
3898         (gnus-group-prev-unread-group 2))
3899       (if (not (equal group (gnus-group-group-name)))
3900           (setq group (gnus-group-group-name))
3901         (setq group nil)))
3902     result))
3903
3904 (defun gnus-summary-read-group-1 (group show-all no-article
3905                                         kill-buffer no-display
3906                                         &optional select-articles)
3907   ;; Killed foreign groups can't be entered.
3908   ;;  (when (and (not (gnus-group-native-p group))
3909   ;;         (not (gnus-gethash group gnus-newsrc-hashtb)))
3910   ;;    (error "Dead non-native groups can't be entered"))
3911   (gnus-message 5 "Retrieving newsgroup: %s..."
3912                 (gnus-group-decoded-name group))
3913   (let* ((new-group (gnus-summary-setup-buffer group))
3914          (quit-config (gnus-group-quit-config group))
3915          (did-select (and new-group (gnus-select-newsgroup
3916                                      group show-all select-articles))))
3917     (cond
3918      ;; This summary buffer exists already, so we just select it.
3919      ((not new-group)
3920       (gnus-set-global-variables)
3921       (when kill-buffer
3922         (gnus-kill-or-deaden-summary kill-buffer))
3923       (gnus-configure-windows 'summary 'force)
3924       (gnus-set-mode-line 'summary)
3925       (gnus-summary-position-point)
3926       (message "")
3927       t)
3928      ;; We couldn't select this group.
3929      ((null did-select)
3930       (when (and (eq major-mode 'gnus-summary-mode)
3931                  (not (equal (current-buffer) kill-buffer)))
3932         (kill-buffer (current-buffer))
3933         (if (not quit-config)
3934             (progn
3935               ;; Update the info -- marks might need to be removed,
3936               ;; for instance.
3937               (gnus-summary-update-info)
3938               (set-buffer gnus-group-buffer)
3939               (gnus-group-jump-to-group group)
3940               (gnus-group-next-unread-group 1))
3941           (gnus-handle-ephemeral-exit quit-config)))
3942       (if (null (gnus-list-of-unread-articles group))
3943           (gnus-message 3 "Group %s contains no messages" group)
3944         (gnus-message 3 "Can't select group"))
3945       nil)
3946      ;; The user did a `C-g' while prompting for number of articles,
3947      ;; so we exit this group.
3948      ((eq did-select 'quit)
3949       (and (eq major-mode 'gnus-summary-mode)
3950            (not (equal (current-buffer) kill-buffer))
3951            (kill-buffer (current-buffer)))
3952       (when kill-buffer
3953         (gnus-kill-or-deaden-summary kill-buffer))
3954       (if (not quit-config)
3955           (progn
3956             (set-buffer gnus-group-buffer)
3957             (gnus-group-jump-to-group group)
3958             (gnus-configure-windows 'group 'force))
3959         (gnus-handle-ephemeral-exit quit-config))
3960       ;; Finally signal the quit.
3961       (signal 'quit nil))
3962      ;; The group was successfully selected.
3963      (t
3964       (gnus-set-global-variables)
3965       ;; Save the active value in effect when the group was entered.
3966       (setq gnus-newsgroup-active
3967             (gnus-copy-sequence
3968              (gnus-active gnus-newsgroup-name)))
3969       (setq gnus-newsgroup-highest (cdr gnus-newsgroup-active))
3970       ;; You can change the summary buffer in some way with this hook.
3971       (gnus-run-hooks 'gnus-select-group-hook)
3972       (when (memq 'summary (gnus-update-format-specifications
3973                             nil 'summary 'summary-mode 'summary-dummy))
3974         ;; The format specification for the summary line was updated,
3975         ;; so we need to update the mark positions as well.
3976         (gnus-update-summary-mark-positions))
3977       ;; Do score processing.
3978       (when gnus-use-scoring
3979         (gnus-possibly-score-headers))
3980       ;; Check whether to fill in the gaps in the threads.
3981       (when gnus-build-sparse-threads
3982         (gnus-build-sparse-threads))
3983       ;; Find the initial limit.
3984       (if show-all
3985           (let ((gnus-newsgroup-dormant nil))
3986             (gnus-summary-initial-limit show-all))
3987         (gnus-summary-initial-limit show-all))
3988       ;; Generate the summary buffer.
3989       (unless no-display
3990         (gnus-summary-prepare))
3991       (when gnus-use-trees
3992         (gnus-tree-open group)
3993         (setq gnus-summary-highlight-line-function
3994               'gnus-tree-highlight-article))
3995       ;; If the summary buffer is empty, but there are some low-scored
3996       ;; articles or some excluded dormants, we include these in the
3997       ;; buffer.
3998       (when (and (zerop (buffer-size))
3999                  (not no-display))
4000         (cond (gnus-newsgroup-dormant
4001                (gnus-summary-limit-include-dormant))
4002               ((and gnus-newsgroup-scored show-all)
4003                (gnus-summary-limit-include-expunged t))))
4004       ;; Function `gnus-apply-kill-file' must be called in this hook.
4005       (gnus-run-hooks 'gnus-apply-kill-hook)
4006       (if (and (zerop (buffer-size))
4007                (not no-display))
4008           (progn
4009             ;; This newsgroup is empty.
4010             (gnus-summary-catchup-and-exit nil t)
4011             (gnus-message 6 "No unread news")
4012             (when kill-buffer
4013               (gnus-kill-or-deaden-summary kill-buffer))
4014             ;; Return nil from this function.
4015             nil)
4016         ;; Hide conversation thread subtrees.  We cannot do this in
4017         ;; gnus-summary-prepare-hook since kill processing may not
4018         ;; work with hidden articles.
4019         (gnus-summary-maybe-hide-threads)
4020         (when kill-buffer
4021           (gnus-kill-or-deaden-summary kill-buffer))
4022         (gnus-summary-auto-select-subject)
4023         ;; Show first unread article if requested.
4024         (if (and (not no-article)
4025                  (not no-display)
4026                  gnus-newsgroup-unreads
4027                  gnus-auto-select-first)
4028             (progn
4029               (gnus-configure-windows 'summary)
4030               (let ((art (gnus-summary-article-number)))
4031                 (unless (and (not gnus-plugged)
4032                              (or (memq art gnus-newsgroup-undownloaded)
4033                                  (memq art gnus-newsgroup-downloadable)))
4034                   (gnus-summary-goto-article art))))
4035           ;; Don't select any articles.
4036           (gnus-summary-position-point)
4037           (gnus-configure-windows 'summary 'force)
4038           (gnus-set-mode-line 'summary))
4039         (when (and gnus-auto-center-group
4040                    (get-buffer-window gnus-group-buffer t))
4041           ;; Gotta use windows, because recenter does weird stuff if
4042           ;; the current buffer ain't the displayed window.
4043           (let ((owin (selected-window)))
4044             (select-window (get-buffer-window gnus-group-buffer t))
4045             (when (gnus-group-goto-group group)
4046               (recenter))
4047             (select-window owin)))
4048         ;; Mark this buffer as "prepared".
4049         (setq gnus-newsgroup-prepared t)
4050         (gnus-run-hooks 'gnus-summary-prepared-hook)
4051         (unless (gnus-ephemeral-group-p group)
4052           (gnus-group-update-group group))
4053         t)))))
4054
4055 (defun gnus-summary-auto-select-subject ()
4056   "Select the subject line on initial group entry."
4057   (goto-char (point-min))
4058   (cond
4059    ((eq gnus-auto-select-subject 'best)
4060     (gnus-summary-best-unread-subject))
4061    ((eq gnus-auto-select-subject 'unread)
4062     (gnus-summary-first-unread-subject))
4063    ((eq gnus-auto-select-subject 'unseen)
4064     (gnus-summary-first-unseen-subject))
4065    ((eq gnus-auto-select-subject 'unseen-or-unread)
4066     (gnus-summary-first-unseen-or-unread-subject))
4067    ((eq gnus-auto-select-subject 'first)
4068     ;; Do nothing.
4069     )
4070    ((functionp gnus-auto-select-subject)
4071     (funcall gnus-auto-select-subject))))
4072
4073 (defun gnus-summary-prepare ()
4074   "Generate the summary buffer."
4075   (interactive)
4076   (let ((inhibit-read-only t))
4077     (erase-buffer)
4078     (setq gnus-newsgroup-data nil
4079           gnus-newsgroup-data-reverse nil)
4080     (gnus-run-hooks 'gnus-summary-generate-hook)
4081     ;; Generate the buffer, either with threads or without.
4082     (when gnus-newsgroup-headers
4083       (gnus-summary-prepare-threads
4084        (if gnus-show-threads
4085            (gnus-sort-gathered-threads
4086             (funcall gnus-summary-thread-gathering-function
4087                      (gnus-sort-threads
4088                       (gnus-cut-threads (gnus-make-threads)))))
4089          ;; Unthreaded display.
4090          (gnus-sort-articles gnus-newsgroup-headers))))
4091     (setq gnus-newsgroup-data (nreverse gnus-newsgroup-data))
4092     ;; Call hooks for modifying summary buffer.
4093     (goto-char (point-min))
4094     (gnus-run-hooks 'gnus-summary-prepare-hook)))
4095
4096 (defsubst gnus-general-simplify-subject (subject)
4097   "Simplify subject by the same rules as `gnus-gather-threads-by-subject'."
4098   (setq subject
4099         (cond
4100          ;; Truncate the subject.
4101          (gnus-simplify-subject-functions
4102           (gnus-map-function gnus-simplify-subject-functions subject))
4103          ((numberp gnus-summary-gather-subject-limit)
4104           (setq subject (gnus-simplify-subject-re subject))
4105           (if (> (length subject) gnus-summary-gather-subject-limit)
4106               (substring subject 0 gnus-summary-gather-subject-limit)
4107             subject))
4108          ;; Fuzzily simplify it.
4109          ((eq 'fuzzy gnus-summary-gather-subject-limit)
4110           (gnus-simplify-subject-fuzzy subject))
4111          ;; Just remove the leading "Re:".
4112          (t
4113           (gnus-simplify-subject-re subject))))
4114
4115   (if (and gnus-summary-gather-exclude-subject
4116            (string-match gnus-summary-gather-exclude-subject subject))
4117       nil                         ; This article shouldn't be gathered
4118     subject))
4119
4120 (defun gnus-summary-simplify-subject-query ()
4121   "Query where the respool algorithm would put this article."
4122   (interactive)
4123   (gnus-summary-select-article)
4124   (message "%s" (gnus-general-simplify-subject (gnus-summary-article-subject))))
4125
4126 (defun gnus-gather-threads-by-subject (threads)
4127   "Gather threads by looking at Subject headers."
4128   (if (not gnus-summary-make-false-root)
4129       threads
4130     (let ((hashtb (gnus-make-hashtable 1024))
4131           (prev threads)
4132           (result threads)
4133           subject hthread whole-subject)
4134       (while threads
4135         (setq subject (gnus-general-simplify-subject
4136                        (setq whole-subject (mail-header-subject
4137                                             (caar threads)))))
4138         (when subject
4139           (if (setq hthread (gnus-gethash subject hashtb))
4140               (progn
4141                 ;; We enter a dummy root into the thread, if we
4142                 ;; haven't done that already.
4143                 (unless (stringp (caar hthread))
4144                   (setcar hthread (list whole-subject (car hthread))))
4145                 ;; We add this new gathered thread to this gathered
4146                 ;; thread.
4147                 (setcdr (car hthread)
4148                         (nconc (cdar hthread) (list (car threads))))
4149                 ;; Remove it from the list of threads.
4150                 (setcdr prev (cdr threads))
4151                 (setq threads prev))
4152             ;; Enter this thread into the hash table.
4153             (gnus-sethash subject
4154                           (if gnus-summary-make-false-root-always
4155                               (progn
4156                                 ;; If you want a dummy root above all
4157                                 ;; threads...
4158                                 (setcar threads (list whole-subject
4159                                                       (car threads)))
4160                                 threads)
4161                             threads)
4162                           hashtb)))
4163         (setq prev threads)
4164         (setq threads (cdr threads)))
4165       result)))
4166
4167 (defun gnus-gather-threads-by-references (threads)
4168   "Gather threads by looking at References headers."
4169   (let ((idhashtb (gnus-make-hashtable 1024))
4170         (thhashtb (gnus-make-hashtable 1024))
4171         (prev threads)
4172         (result threads)
4173         ids references id gthread gid entered ref)
4174     (while threads
4175       (when (setq references (mail-header-references (caar threads)))
4176         (setq id (mail-header-id (caar threads))
4177               ids (inline (gnus-split-references references))
4178               entered nil)
4179         (while (setq ref (pop ids))
4180           (setq ids (delete ref ids))
4181           (if (not (setq gid (gnus-gethash ref idhashtb)))
4182               (progn
4183                 (gnus-sethash ref id idhashtb)
4184                 (gnus-sethash id threads thhashtb))
4185             (setq gthread (gnus-gethash gid thhashtb))
4186             (unless entered
4187               ;; We enter a dummy root into the thread, if we
4188               ;; haven't done that already.
4189               (unless (stringp (caar gthread))
4190                 (setcar gthread (list (mail-header-subject (caar gthread))
4191                                       (car gthread))))
4192               ;; We add this new gathered thread to this gathered
4193               ;; thread.
4194               (setcdr (car gthread)
4195                       (nconc (cdar gthread) (list (car threads)))))
4196             ;; Add it into the thread hash table.
4197             (gnus-sethash id gthread thhashtb)
4198             (setq entered t)
4199             ;; Remove it from the list of threads.
4200             (setcdr prev (cdr threads))
4201             (setq threads prev))))
4202       (setq prev threads)
4203       (setq threads (cdr threads)))
4204     result))
4205
4206 (defun gnus-sort-gathered-threads (threads)
4207   "Sort subtreads inside each gathered thread by `gnus-sort-gathered-threads-function'."
4208   (let ((result threads))
4209     (while threads
4210       (when (stringp (caar threads))
4211         (setcdr (car threads)
4212                 (sort (cdar threads) gnus-sort-gathered-threads-function)))
4213       (setq threads (cdr threads)))
4214     result))
4215
4216 (defun gnus-thread-loop-p (root thread)
4217   "Say whether ROOT is in THREAD."
4218   (let ((stack (list thread))
4219         (infloop 0)
4220         th)
4221     (while (setq thread (pop stack))
4222       (setq th (cdr thread))
4223       (while (and th
4224                   (not (eq (caar th) root)))
4225         (pop th))
4226       (if th
4227           ;; We have found a loop.
4228           (let (ref-dep)
4229             (setcdr thread (delq (car th) (cdr thread)))
4230             (if (boundp (setq ref-dep (intern "none"
4231                                               gnus-newsgroup-dependencies)))
4232                 (setcdr (symbol-value ref-dep)
4233                         (nconc (cdr (symbol-value ref-dep))
4234                                (list (car th))))
4235               (set ref-dep (list nil (car th))))
4236             (setq infloop 1
4237                   stack nil))
4238         ;; Push all the subthreads onto the stack.
4239         (push (cdr thread) stack)))
4240     infloop))
4241
4242 (defun gnus-make-threads ()
4243   "Go through the dependency hashtb and find the roots.  Return all threads."
4244   (let (threads)
4245     (while (catch 'infloop
4246              (mapatoms
4247               (lambda (refs)
4248                 ;; Deal with self-referencing References loops.
4249                 (when (and (car (symbol-value refs))
4250                            (not (zerop
4251                                  (apply
4252                                   '+
4253                                   (mapcar
4254                                    (lambda (thread)
4255                                      (gnus-thread-loop-p
4256                                       (car (symbol-value refs)) thread))
4257                                    (cdr (symbol-value refs)))))))
4258                   (setq threads nil)
4259                   (throw 'infloop t))
4260                 (unless (car (symbol-value refs))
4261                   ;; These threads do not refer back to any other
4262                   ;; articles, so they're roots.
4263                   (setq threads (append (cdr (symbol-value refs)) threads))))
4264               gnus-newsgroup-dependencies)))
4265     threads))
4266
4267 ;; Build the thread tree.
4268 (defsubst gnus-dependencies-add-header (header dependencies force-new)
4269   "Enter HEADER into the DEPENDENCIES table if it is not already there.
4270
4271 If FORCE-NEW is not nil, enter HEADER into the DEPENDENCIES table even
4272 if it was already present.
4273
4274 If `gnus-summary-ignore-duplicates' is nil then duplicate Message-IDs
4275 will not be entered in the DEPENDENCIES table.  Otherwise duplicate
4276 Message-IDs will be renamed to a unique Message-ID before being
4277 entered.
4278
4279 Returns HEADER if it was entered in the DEPENDENCIES.  Returns nil otherwise."
4280   (let* ((id (mail-header-id header))
4281          (id-dep (and id (intern id dependencies)))
4282          parent-id ref ref-dep ref-header replaced)
4283     ;; Enter this `header' in the `dependencies' table.
4284     (cond
4285      ((not id-dep)
4286       (setq header nil))
4287      ;; The first two cases do the normal part: enter a new `header'
4288      ;; in the `dependencies' table.
4289      ((not (boundp id-dep))
4290       (set id-dep (list header)))
4291      ((null (car (symbol-value id-dep)))
4292       (setcar (symbol-value id-dep) header))
4293
4294      ;; From here the `header' was already present in the
4295      ;; `dependencies' table.
4296      (force-new
4297       ;; Overrides an existing entry;
4298       ;; just set the header part of the entry.
4299       (setcar (symbol-value id-dep) header)
4300       (setq replaced t))
4301
4302      ;; Renames the existing `header' to a unique Message-ID.
4303      ((not gnus-summary-ignore-duplicates)
4304       ;; An article with this Message-ID has already been seen.
4305       ;; We rename the Message-ID.
4306       (set (setq id-dep (intern (setq id (nnmail-message-id)) dependencies))
4307            (list header))
4308       (mail-header-set-id header id))
4309
4310      ;; The last case ignores an existing entry, except it adds any
4311      ;; additional Xrefs (in case the two articles came from different
4312      ;; servers.
4313      ;; Also sets `header' to `nil' meaning that the `dependencies'
4314      ;; table was *not* modified.
4315      (t
4316       (mail-header-set-xref
4317        (car (symbol-value id-dep))
4318        (concat (or (mail-header-xref (car (symbol-value id-dep)))
4319                    "")
4320                (or (mail-header-xref header) "")))
4321       (setq header nil)))
4322
4323     (when (and header (not replaced))
4324       ;; First check that we are not creating a References loop.
4325       (setq parent-id (gnus-parent-id (mail-header-references header)))
4326       (setq ref parent-id)
4327       (while (and ref
4328                   (setq ref-dep (intern-soft ref dependencies))
4329                   (boundp ref-dep)
4330                   (setq ref-header (car (symbol-value ref-dep))))
4331         (if (string= id ref)
4332             ;; Yuk!  This is a reference loop.  Make the article be a
4333             ;; root article.
4334             (progn
4335               (mail-header-set-references (car (symbol-value id-dep)) "none")
4336               (setq ref nil)
4337               (setq parent-id nil))
4338           (setq ref (gnus-parent-id (mail-header-references ref-header)))))
4339       (setq ref-dep (intern (or parent-id "none") dependencies))
4340       (if (boundp ref-dep)
4341           (setcdr (symbol-value ref-dep)
4342                   (nconc (cdr (symbol-value ref-dep))
4343                          (list (symbol-value id-dep))))
4344         (set ref-dep (list nil (symbol-value id-dep)))))
4345     header))
4346
4347 (defun gnus-extract-message-id-from-in-reply-to (string)
4348   (if (string-match "<[^>]+>" string)
4349       (substring string (match-beginning 0) (match-end 0))
4350     nil))
4351
4352 (defun gnus-build-sparse-threads ()
4353   (let ((headers gnus-newsgroup-headers)
4354         (mail-parse-charset gnus-newsgroup-charset)
4355         (gnus-summary-ignore-duplicates t)
4356         header references generation relations
4357         subject child end new-child date)
4358     ;; First we create an alist of generations/relations, where
4359     ;; generations is how much we trust the relation, and the relation
4360     ;; is parent/child.
4361     (gnus-message 7 "Making sparse threads...")
4362     (save-excursion
4363       (nnheader-set-temp-buffer " *gnus sparse threads*")
4364       (while (setq header (pop headers))
4365         (when (and (setq references (mail-header-references header))
4366                    (not (string= references "")))
4367           (insert references)
4368           (setq child (mail-header-id header)
4369                 subject (mail-header-subject header)
4370                 date (mail-header-date header)
4371                 generation 0)
4372           (while (search-backward ">" nil t)
4373             (setq end (1+ (point)))
4374             (when (search-backward "<" nil t)
4375               (setq new-child (buffer-substring (point) end))
4376               (push (list (incf generation)
4377                           child (setq child new-child)
4378                           subject date)
4379                     relations)))
4380           (when child
4381             (push (list (1+ generation) child nil subject) relations))
4382           (erase-buffer)))
4383       (kill-buffer (current-buffer)))
4384     ;; Sort over trustworthiness.
4385     (dolist (relation (sort relations 'car-less-than-car))
4386       (when (gnus-dependencies-add-header
4387              (make-full-mail-header
4388               gnus-reffed-article-number
4389               (nth 3 relation) "" (or (nth 4 relation) "")
4390               (nth 1 relation)
4391               (or (nth 2 relation) "") 0 0 "")
4392              gnus-newsgroup-dependencies nil)
4393         (push gnus-reffed-article-number gnus-newsgroup-limit)
4394         (push gnus-reffed-article-number gnus-newsgroup-sparse)
4395         (push (cons gnus-reffed-article-number gnus-sparse-mark)
4396               gnus-newsgroup-reads)
4397         (decf gnus-reffed-article-number)))
4398     (gnus-message 7 "Making sparse threads...done")))
4399
4400 (defun gnus-build-old-threads ()
4401   ;; Look at all the articles that refer back to old articles, and
4402   ;; fetch the headers for the articles that aren't there.  This will
4403   ;; build complete threads - if the roots haven't been expired by the
4404   ;; server, that is.
4405   (let ((mail-parse-charset gnus-newsgroup-charset)
4406         id heads)
4407     (mapatoms
4408      (lambda (refs)
4409        (when (not (car (symbol-value refs)))
4410          (setq heads (cdr (symbol-value refs)))
4411          (while heads
4412            (if (memq (mail-header-number (caar heads))
4413                      gnus-newsgroup-dormant)
4414                (setq heads (cdr heads))
4415              (setq id (symbol-name refs))
4416              (while (and (setq id (gnus-build-get-header id))
4417                          (not (car (gnus-id-to-thread id)))))
4418              (setq heads nil)))))
4419      gnus-newsgroup-dependencies)))
4420
4421 (defsubst gnus-remove-odd-characters (string)
4422   "Translate STRING into something that doesn't contain weird characters."
4423   (mm-subst-char-in-string
4424    ?\r ?\-
4425    (mm-subst-char-in-string ?\n ?\- string t) t))
4426
4427 ;; This function has to be called with point after the article number
4428 ;; on the beginning of the line.
4429 (defsubst gnus-nov-parse-line (number dependencies &optional force-new)
4430   (let ((eol (point-at-eol))
4431         (buffer (current-buffer))
4432         header references in-reply-to)
4433
4434     ;; overview: [num subject from date id refs chars lines misc]
4435     (unwind-protect
4436         (let (x)
4437           (narrow-to-region (point) eol)
4438           (unless (eobp)
4439             (forward-char))
4440
4441           (setq header
4442                 (make-full-mail-header
4443                  number                 ; number
4444                  (condition-case ()     ; subject
4445                      (gnus-remove-odd-characters
4446                       (funcall gnus-decode-encoded-word-function
4447                                (setq x (nnheader-nov-field))))
4448                    (error x))
4449                  (condition-case ()     ; from
4450                      (gnus-remove-odd-characters
4451                       (funcall gnus-decode-encoded-address-function
4452                                (setq x (nnheader-nov-field))))
4453                    (error x))
4454                  (nnheader-nov-field)   ; date
4455                  (nnheader-nov-read-message-id number)  ; id
4456                  (setq references (nnheader-nov-field)) ; refs
4457                  (nnheader-nov-read-integer) ; chars
4458                  (nnheader-nov-read-integer) ; lines
4459                  (unless (eobp)
4460                    (if (looking-at "Xref: ")
4461                        (goto-char (match-end 0)))
4462                    (nnheader-nov-field)) ; Xref
4463                  (nnheader-nov-parse-extra)))) ; extra
4464
4465       (widen))
4466
4467     (when (and (string= references "")
4468                (setq in-reply-to (mail-header-extra header))
4469                (setq in-reply-to (cdr (assq 'In-Reply-To in-reply-to))))
4470       (mail-header-set-references
4471        header (gnus-extract-message-id-from-in-reply-to in-reply-to)))
4472
4473     (when gnus-alter-header-function
4474       (funcall gnus-alter-header-function header))
4475     (gnus-dependencies-add-header header dependencies force-new)))
4476
4477 (defun gnus-build-get-header (id)
4478   "Look through the buffer of NOV lines and find the header to ID.
4479 Enter this line into the dependencies hash table, and return
4480 the id of the parent article (if any)."
4481   (let ((deps gnus-newsgroup-dependencies)
4482         found header)
4483     (prog1
4484         (with-current-buffer nntp-server-buffer
4485           (let ((case-fold-search nil))
4486             (goto-char (point-min))
4487             (while (and (not found)
4488                         (search-forward id nil t))
4489               (beginning-of-line)
4490               (setq found (looking-at
4491                            (format "^[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t%s"
4492                                    (regexp-quote id))))
4493               (or found (beginning-of-line 2)))
4494             (when found
4495               (beginning-of-line)
4496               (and
4497                (setq header (gnus-nov-parse-line
4498                              (read (current-buffer)) deps))
4499                (gnus-parent-id (mail-header-references header))))))
4500       (when header
4501         (let ((number (mail-header-number header)))
4502           (push number gnus-newsgroup-limit)
4503           (push header gnus-newsgroup-headers)
4504           (if (memq number gnus-newsgroup-unselected)
4505               (progn
4506                 (setq gnus-newsgroup-unreads
4507                       (gnus-add-to-sorted-list gnus-newsgroup-unreads
4508                                                number))
4509                 (setq gnus-newsgroup-unselected
4510                       (delq number gnus-newsgroup-unselected)))
4511             (push number gnus-newsgroup-ancient)))))))
4512
4513 (defun gnus-build-all-threads ()
4514   "Read all the headers."
4515   (let ((gnus-summary-ignore-duplicates t)
4516         (mail-parse-charset gnus-newsgroup-charset)
4517         (dependencies gnus-newsgroup-dependencies)
4518         header article)
4519     (with-current-buffer nntp-server-buffer
4520       (let ((case-fold-search nil))
4521         (goto-char (point-min))
4522         (while (not (eobp))
4523           (ignore-errors
4524             (setq article (read (current-buffer))
4525                   header (gnus-nov-parse-line article dependencies t)))
4526           (when header
4527             (with-current-buffer gnus-summary-buffer
4528               (push header gnus-newsgroup-headers)
4529               (if (memq (setq article (mail-header-number header))
4530                         gnus-newsgroup-unselected)
4531                   (progn
4532                     (setq gnus-newsgroup-unreads
4533                           (gnus-add-to-sorted-list
4534                            gnus-newsgroup-unreads article))
4535                     (setq gnus-newsgroup-unselected
4536                           (delq article gnus-newsgroup-unselected)))
4537                 (push article gnus-newsgroup-ancient)))
4538             (forward-line 1)))))))
4539
4540 (defun gnus-summary-update-article-line (article header)
4541   "Update the line for ARTICLE using HEADER."
4542   (let* ((id (mail-header-id header))
4543          (thread (gnus-id-to-thread id)))
4544     (unless thread
4545       (error "Article in no thread"))
4546     ;; Update the thread.
4547     (setcar thread header)
4548     (gnus-summary-goto-subject article)
4549     (let* ((datal (gnus-data-find-list article))
4550            (data (car datal))
4551            (inhibit-read-only t)
4552            (level (gnus-summary-thread-level)))
4553       (gnus-delete-line)
4554       (let ((inserted (- (point)
4555                          (progn
4556                            (gnus-summary-insert-line
4557                             header level nil
4558                             (memq article gnus-newsgroup-undownloaded)
4559                             (gnus-article-mark article)
4560                             (memq article gnus-newsgroup-replied)
4561                             (memq article gnus-newsgroup-expirable)
4562                             ;; Only insert the Subject string when it's different
4563                             ;; from the previous Subject string.
4564                             (if (and
4565                                  gnus-show-threads
4566                                  (gnus-subject-equal
4567                                   (condition-case ()
4568                                       (mail-header-subject
4569                                        (gnus-data-header
4570                                         (cadr
4571                                          (gnus-data-find-list
4572                                           article
4573                                           (gnus-data-list t)))))
4574                                     ;; Error on the side of excessive subjects.
4575                                     (error ""))
4576                                   (mail-header-subject header)))
4577                                 ""
4578                               (mail-header-subject header))
4579                             nil (cdr (assq article gnus-newsgroup-scored))
4580                             (memq article gnus-newsgroup-processable))
4581                            (point)))))
4582         (when (cdr datal)
4583           (gnus-data-update-list
4584            (cdr datal)
4585            (- (gnus-data-pos data) (gnus-data-pos (cadr datal)) inserted)))))))
4586
4587 (defun gnus-summary-update-article (article &optional iheader)
4588   "Update ARTICLE in the summary buffer."
4589   (set-buffer gnus-summary-buffer)
4590   (let* ((header (gnus-summary-article-header article))
4591          (id (mail-header-id header))
4592          (data (gnus-data-find article))
4593          (thread (gnus-id-to-thread id))
4594          (references (mail-header-references header))
4595          (parent
4596           (gnus-id-to-thread
4597            (or (gnus-parent-id
4598                 (when (and references
4599                            (not (equal "" references)))
4600                   references))
4601                "none")))
4602          (inhibit-read-only t)
4603          (old (car thread)))
4604     (when thread
4605       (unless iheader
4606         (setcar thread nil)
4607         (when parent
4608           (delq thread parent)))
4609       (if (gnus-summary-insert-subject id header)
4610           ;; Set the (possibly) new article number in the data structure.
4611           (gnus-data-set-number data (gnus-id-to-article id))
4612         (setcar thread old)
4613         nil))))
4614
4615 (defun gnus-rebuild-thread (id &optional line)
4616   "Rebuild the thread containing ID.
4617 If LINE, insert the rebuilt thread starting on line LINE."
4618   (let ((inhibit-read-only t)
4619         old-pos current thread data)
4620     (if (not gnus-show-threads)
4621         (setq thread (list (car (gnus-id-to-thread id))))
4622       ;; Get the thread this article is part of.
4623       (setq thread (gnus-remove-thread id)))
4624     (setq old-pos (point-at-bol))
4625     (setq current (save-excursion
4626                     (and (re-search-backward "[\r\n]" nil t)
4627                          (gnus-summary-article-number))))
4628     ;; If this is a gathered thread, we have to go some re-gathering.
4629     (when (stringp (car thread))
4630       (let ((subject (car thread))
4631             roots thr)
4632         (setq thread (cdr thread))
4633         (while thread
4634           (unless (memq (setq thr (gnus-id-to-thread
4635                                    (gnus-root-id
4636                                     (mail-header-id (caar thread)))))
4637                         roots)
4638             (push thr roots))
4639           (setq thread (cdr thread)))
4640         ;; We now have all (unique) roots.
4641         (if (= (length roots) 1)
4642             ;; All the loose roots are now one solid root.
4643             (setq thread (car roots))
4644           (setq thread (cons subject (gnus-sort-threads roots))))))
4645     (let (threads)
4646       ;; We then insert this thread into the summary buffer.
4647       (when line
4648         (goto-char (point-min))
4649         (forward-line (1- line)))
4650       (let (gnus-newsgroup-data gnus-newsgroup-threads)
4651         (if gnus-show-threads
4652             (gnus-summary-prepare-threads (gnus-cut-threads (list thread)))
4653           (gnus-summary-prepare-unthreaded thread))
4654         (setq data (nreverse gnus-newsgroup-data))
4655         (setq threads gnus-newsgroup-threads))
4656       ;; We splice the new data into the data structure.
4657       ;;!!! This is kinda bogus.  We assume that in LINE is non-nil,
4658       ;;!!! then we want to insert at the beginning of the buffer.
4659       ;;!!! That happens to be true with Gnus now, but that may
4660       ;;!!! change in the future.  Perhaps.
4661       (gnus-data-enter-list
4662        (if line nil current) data (- (point) old-pos))
4663       (setq gnus-newsgroup-threads
4664             (nconc threads gnus-newsgroup-threads))
4665       (gnus-data-compute-positions))))
4666
4667 (defun gnus-number-to-header (number)
4668   "Return the header for article NUMBER."
4669   (let ((headers gnus-newsgroup-headers))
4670     (while (and headers
4671                 (not (= number (mail-header-number (car headers)))))
4672       (pop headers))
4673     (when headers
4674       (car headers))))
4675
4676 (defun gnus-parent-headers (in-headers &optional generation)
4677   "Return the headers of the GENERATIONeth parent of HEADERS."
4678   (unless generation
4679     (setq generation 1))
4680   (let ((parent t)
4681         (headers in-headers)
4682         references)
4683     (while (and parent
4684                 (not (zerop generation))
4685                 (setq references (mail-header-references headers)))
4686       (setq headers (if (and references
4687                              (setq parent (gnus-parent-id references)))
4688                         (car (gnus-id-to-thread parent))
4689                       nil))
4690       (decf generation))
4691     (and (not (eq headers in-headers))
4692          headers)))
4693
4694 (defun gnus-id-to-thread (id)
4695   "Return the (sub-)thread where ID appears."
4696   (gnus-gethash id gnus-newsgroup-dependencies))
4697
4698 (defun gnus-id-to-article (id)
4699   "Return the article number of ID."
4700   (let ((thread (gnus-id-to-thread id)))
4701     (when (and thread
4702                (car thread))
4703       (mail-header-number (car thread)))))
4704
4705 (defun gnus-id-to-header (id)
4706   "Return the article headers of ID."
4707   (car (gnus-id-to-thread id)))
4708
4709 (defun gnus-article-displayed-root-p (article)
4710   "Say whether ARTICLE is a root(ish) article."
4711   (let ((level (gnus-summary-thread-level article))
4712         (refs (mail-header-references  (gnus-summary-article-header article)))
4713         particle)
4714     (cond
4715      ((null level) nil)
4716      ((zerop level) t)
4717      ((null refs) t)
4718      ((null (gnus-parent-id refs)) t)
4719      ((and (= 1 level)
4720            (null (setq particle (gnus-id-to-article
4721                                  (gnus-parent-id refs))))
4722            (null (gnus-summary-thread-level particle)))))))
4723
4724 (defun gnus-root-id (id)
4725   "Return the id of the root of the thread where ID appears."
4726   (let (last-id prev)
4727     (while (and id (setq prev (car (gnus-id-to-thread id))))
4728       (setq last-id id
4729             id (gnus-parent-id (mail-header-references prev))))
4730     last-id))
4731
4732 (defun gnus-articles-in-thread (thread)
4733   "Return the list of articles in THREAD."
4734   (cons (mail-header-number (car thread))
4735         (apply 'nconc (mapcar 'gnus-articles-in-thread (cdr thread)))))
4736
4737 (defun gnus-remove-thread (id &optional dont-remove)
4738   "Remove the thread that has ID in it."
4739   (let (headers thread last-id)
4740     ;; First go up in this thread until we find the root.
4741     (setq last-id (gnus-root-id id)
4742           headers (message-flatten-list (gnus-id-to-thread last-id)))
4743     ;; We have now found the real root of this thread.  It might have
4744     ;; been gathered into some loose thread, so we have to search
4745     ;; through the threads to find the thread we wanted.
4746     (let ((threads gnus-newsgroup-threads)
4747           sub)
4748       (while threads
4749         (setq sub (car threads))
4750         (if (stringp (car sub))
4751             ;; This is a gathered thread, so we look at the roots
4752             ;; below it to find whether this article is in this
4753             ;; gathered root.
4754             (progn
4755               (setq sub (cdr sub))
4756               (while sub
4757                 (when (member (caar sub) headers)
4758                   (setq thread (car threads)
4759                         threads nil
4760                         sub nil))
4761                 (setq sub (cdr sub))))
4762           ;; It's an ordinary thread, so we check it.
4763           (when (eq (car sub) (car headers))
4764             (setq thread sub
4765                   threads nil)))
4766         (setq threads (cdr threads)))
4767       ;; If this article is in no thread, then it's a root.
4768       (if thread
4769           (unless dont-remove
4770             (setq gnus-newsgroup-threads (delq thread gnus-newsgroup-threads)))
4771         (setq thread (gnus-id-to-thread last-id)))
4772       (when thread
4773         (prog1
4774             thread                      ; We return this thread.
4775           (unless dont-remove
4776             (if (stringp (car thread))
4777                 (progn
4778                   ;; If we use dummy roots, then we have to remove the
4779                   ;; dummy root as well.
4780                   (when (eq gnus-summary-make-false-root 'dummy)
4781                     ;; We go to the dummy root by going to
4782                     ;; the first sub-"thread", and then one line up.
4783                     (gnus-summary-goto-article
4784                      (mail-header-number (caadr thread)))
4785                     (forward-line -1)
4786                     (gnus-delete-line)
4787                     (gnus-data-compute-positions))
4788                   (setq thread (cdr thread))
4789                   (while thread
4790                     (gnus-remove-thread-1 (car thread))
4791                     (setq thread (cdr thread))))
4792               (gnus-remove-thread-1 thread))))))))
4793
4794 (defun gnus-remove-thread-1 (thread)
4795   "Remove the thread THREAD recursively."
4796   (let ((number (mail-header-number (pop thread)))
4797         d)
4798     (setq thread (reverse thread))
4799     (while thread
4800       (gnus-remove-thread-1 (pop thread)))
4801     (when (setq d (gnus-data-find number))
4802       (goto-char (gnus-data-pos d))
4803       (gnus-summary-show-thread)
4804       (gnus-data-remove
4805        number
4806        (- (point-at-bol)
4807           (prog1
4808               (1+ (point-at-eol))
4809             (gnus-delete-line)))))))
4810
4811 (defun gnus-sort-threads-recursive (threads func)
4812   (sort (mapcar (lambda (thread)
4813                   (cons (car thread)
4814                         (and (cdr thread)
4815                              (gnus-sort-threads-recursive (cdr thread) func))))
4816                 threads) func))
4817
4818 (defun gnus-sort-threads-loop (threads func)
4819   (let* ((superthread (cons nil threads))
4820          (stack (list (cons superthread threads)))
4821          remaining-threads thread)
4822     (while stack
4823       (setq remaining-threads (cdr (car stack)))
4824       (if remaining-threads
4825           (progn (setq thread (car remaining-threads))
4826                  (setcdr (car stack) (cdr remaining-threads))
4827                  (if (cdr thread)
4828                      (push (cons thread (cdr thread)) stack)))
4829         (setq thread (caar stack))
4830         (setcdr thread (sort (cdr thread) func))
4831         (pop stack)))
4832     (cdr superthread)))
4833
4834 (defun gnus-sort-threads (threads)
4835   "Sort THREADS."
4836   (if (not gnus-thread-sort-functions)
4837       threads
4838     (gnus-message 8 "Sorting threads...")
4839     (prog1
4840         (condition-case nil
4841             (let ((max-lisp-eval-depth (max max-lisp-eval-depth 5000)))
4842               (gnus-sort-threads-recursive
4843                threads (gnus-make-sort-function gnus-thread-sort-functions)))
4844           ;; Even after binding max-lisp-eval-depth, the recursive
4845           ;; sorter might fail for very long threads.  In that case,
4846           ;; try using a (less well-tested) non-recursive sorter.
4847           (error (gnus-message 9 "Sorting threads with loop...")
4848                  (gnus-sort-threads-loop
4849                   threads (gnus-make-sort-function
4850                            gnus-thread-sort-functions))))
4851       (gnus-message 8 "Sorting threads...done"))))
4852
4853 (defun gnus-sort-articles (articles)
4854   "Sort ARTICLES."
4855   (when gnus-article-sort-functions
4856     (gnus-message 7 "Sorting articles...")
4857     (prog1
4858         (setq gnus-newsgroup-headers
4859               (sort articles (gnus-make-sort-function
4860                               gnus-article-sort-functions)))
4861       (gnus-message 7 "Sorting articles...done"))))
4862
4863 ;; Written by Hallvard B Furuseth <h.b.furuseth@usit.uio.no>.
4864 (defmacro gnus-thread-header (thread)
4865   "Return header of first article in THREAD.
4866 Note that THREAD must never, ever be anything else than a variable -
4867 using some other form will lead to serious barfage."
4868   (or (symbolp thread) (signal 'wrong-type-argument '(symbolp thread)))
4869   ;; (8% speedup to gnus-summary-prepare, just for fun :-)
4870   (list 'byte-code "\10\211:\203\17\0\211@;\203\16\0A@@\207"
4871         (vector thread) 2))
4872
4873 (defsubst gnus-article-sort-by-number (h1 h2)
4874   "Sort articles by article number."
4875   (< (mail-header-number h1)
4876      (mail-header-number h2)))
4877
4878 (defun gnus-thread-sort-by-number (h1 h2)
4879   "Sort threads by root article number."
4880   (gnus-article-sort-by-number
4881    (gnus-thread-header h1) (gnus-thread-header h2)))
4882
4883 (defsubst gnus-article-sort-by-random (h1 h2)
4884   "Sort articles randomly."
4885   (zerop (random 2)))
4886
4887 (defun gnus-thread-sort-by-random (h1 h2)
4888   "Sort threads randomly."
4889   (gnus-article-sort-by-random
4890    (gnus-thread-header h1) (gnus-thread-header h2)))
4891
4892 (defsubst gnus-article-sort-by-lines (h1 h2)
4893   "Sort articles by article Lines header."
4894   (< (mail-header-lines h1)
4895      (mail-header-lines h2)))
4896
4897 (defun gnus-thread-sort-by-lines (h1 h2)
4898   "Sort threads by root article Lines header."
4899   (gnus-article-sort-by-lines
4900    (gnus-thread-header h1) (gnus-thread-header h2)))
4901
4902 (defsubst gnus-article-sort-by-chars (h1 h2)
4903   "Sort articles by octet length."
4904   (< (mail-header-chars h1)
4905      (mail-header-chars h2)))
4906
4907 (defun gnus-thread-sort-by-chars (h1 h2)
4908   "Sort threads by root article octet length."
4909   (gnus-article-sort-by-chars
4910    (gnus-thread-header h1) (gnus-thread-header h2)))
4911
4912 (defsubst gnus-article-sort-by-author (h1 h2)
4913   "Sort articles by root author."
4914   (gnus-string<
4915    (let ((extract (funcall
4916                    gnus-extract-address-components
4917                    (mail-header-from h1))))
4918      (or (car extract) (cadr extract) ""))
4919    (let ((extract (funcall
4920                    gnus-extract-address-components
4921                    (mail-header-from h2))))
4922      (or (car extract) (cadr extract) ""))))
4923
4924 (defun gnus-thread-sort-by-author (h1 h2)
4925   "Sort threads by root author."
4926   (gnus-article-sort-by-author
4927    (gnus-thread-header h1)  (gnus-thread-header h2)))
4928
4929 (defsubst gnus-article-sort-by-recipient (h1 h2)
4930   "Sort articles by recipient."
4931   (gnus-string<
4932    (let ((extract (funcall
4933                    gnus-extract-address-components
4934                    (or (cdr (assq 'To (mail-header-extra h1))) ""))))
4935      (or (car extract) (cadr extract)))
4936    (let ((extract (funcall
4937                    gnus-extract-address-components
4938                    (or (cdr (assq 'To (mail-header-extra h2))) ""))))
4939      (or (car extract) (cadr extract)))))
4940
4941 (defun gnus-thread-sort-by-recipient (h1 h2)
4942   "Sort threads by root recipient."
4943   (gnus-article-sort-by-recipient
4944    (gnus-thread-header h1) (gnus-thread-header h2)))
4945
4946 (defsubst gnus-article-sort-by-subject (h1 h2)
4947   "Sort articles by root subject."
4948   (gnus-string<
4949    (downcase (gnus-simplify-subject-re (mail-header-subject h1)))
4950    (downcase (gnus-simplify-subject-re (mail-header-subject h2)))))
4951
4952 (defun gnus-thread-sort-by-subject (h1 h2)
4953   "Sort threads by root subject."
4954   (gnus-article-sort-by-subject
4955    (gnus-thread-header h1) (gnus-thread-header h2)))
4956
4957 (defsubst gnus-article-sort-by-date (h1 h2)
4958   "Sort articles by root article date."
4959   (time-less-p
4960    (gnus-date-get-time (mail-header-date h1))
4961    (gnus-date-get-time (mail-header-date h2))))
4962
4963 (defun gnus-thread-sort-by-date (h1 h2)
4964   "Sort threads by root article date."
4965   (gnus-article-sort-by-date
4966    (gnus-thread-header h1) (gnus-thread-header h2)))
4967
4968 (defsubst gnus-article-sort-by-score (h1 h2)
4969   "Sort articles by root article score.
4970 Unscored articles will be counted as having a score of zero."
4971   (> (or (cdr (assq (mail-header-number h1)
4972                     gnus-newsgroup-scored))
4973          gnus-summary-default-score 0)
4974      (or (cdr (assq (mail-header-number h2)
4975                     gnus-newsgroup-scored))
4976          gnus-summary-default-score 0)))
4977
4978 (defun gnus-thread-sort-by-score (h1 h2)
4979   "Sort threads by root article score."
4980   (gnus-article-sort-by-score
4981    (gnus-thread-header h1) (gnus-thread-header h2)))
4982
4983 (defun gnus-thread-sort-by-total-score (h1 h2)
4984   "Sort threads by the sum of all scores in the thread.
4985 Unscored articles will be counted as having a score of zero."
4986   (> (gnus-thread-total-score h1) (gnus-thread-total-score h2)))
4987
4988 (defun gnus-thread-total-score (thread)
4989   ;; This function find the total score of THREAD.
4990   (cond
4991    ((null thread)
4992     0)
4993    ((consp thread)
4994     (if (stringp (car thread))
4995         (apply gnus-thread-score-function 0
4996                (mapcar 'gnus-thread-total-score-1 (cdr thread)))
4997       (gnus-thread-total-score-1 thread)))
4998    (t
4999     (gnus-thread-total-score-1 (list thread)))))
5000
5001 (defun gnus-article-sort-by-most-recent-number (h1 h2)
5002   "Sort articles by number."
5003   (gnus-article-sort-by-number h1 h2))
5004
5005 (defun gnus-thread-sort-by-most-recent-number (h1 h2)
5006   "Sort threads such that the thread with the most recently arrived article comes first."
5007   (> (gnus-thread-highest-number h1) (gnus-thread-highest-number h2)))
5008
5009 (defun gnus-thread-highest-number (thread)
5010   "Return the highest article number in THREAD."
5011   (apply 'max (mapcar (lambda (header)
5012                         (mail-header-number header))
5013                       (message-flatten-list thread))))
5014
5015 (defun gnus-article-sort-by-most-recent-date (h1 h2)
5016   "Sort articles by number."
5017   (gnus-article-sort-by-date h1 h2))
5018
5019 (defun gnus-thread-sort-by-most-recent-date (h1 h2)
5020   "Sort threads such that the thread with the most recently dated article comes first."
5021   (> (gnus-thread-latest-date h1) (gnus-thread-latest-date h2)))
5022
5023 ; Since this is called not only to sort the top-level threads, but
5024 ; also in recursive sorts to order the articles within a thread, each
5025 ; article will be processed many times.  Thus it speeds things up
5026 ; quite a bit to use gnus-date-get-time, which caches the time value.
5027 (defun gnus-thread-latest-date (thread)
5028   "Return the highest article date in THREAD."
5029   (apply 'max
5030          (mapcar (lambda (header) (gnus-float-time
5031                                    (gnus-date-get-time
5032                                     (mail-header-date header))))
5033                  (message-flatten-list thread))))
5034
5035 (defun gnus-thread-total-score-1 (root)
5036   ;; This function find the total score of the thread below ROOT.
5037   (setq root (car root))
5038   (apply gnus-thread-score-function
5039          (or (append
5040               (mapcar 'gnus-thread-total-score
5041                       (cdr (gnus-id-to-thread (mail-header-id root))))
5042               (when (> (mail-header-number root) 0)
5043                 (list (or (cdr (assq (mail-header-number root)
5044                                      gnus-newsgroup-scored))
5045                           gnus-summary-default-score 0))))
5046              (list gnus-summary-default-score)
5047              '(0))))
5048
5049 ;; Added by Per Abrahamsen <amanda@iesd.auc.dk>.
5050 (defvar gnus-tmp-prev-subject nil)
5051 (defvar gnus-tmp-false-parent nil)
5052 (defvar gnus-tmp-root-expunged nil)
5053 (defvar gnus-tmp-dummy-line nil)
5054
5055 (defun gnus-extra-header (type &optional header)
5056   "Return the extra header of TYPE."
5057   (or (cdr (assq type (mail-header-extra (or header gnus-tmp-header))))
5058       ""))
5059
5060 (defvar gnus-tmp-thread-tree-header-string "")
5061
5062 (defcustom gnus-sum-thread-tree-root "> "
5063   "With %B spec, used for the root of a thread.
5064 If nil, use subject instead."
5065   :version "22.1"
5066   :type '(radio (const :format "%v  " nil) string)
5067   :group 'gnus-thread)
5068
5069 (defcustom gnus-sum-thread-tree-false-root "> "
5070   "With %B spec, used for a false root of a thread.
5071 If nil, use subject instead."
5072   :version "22.1"
5073   :type '(radio (const :format "%v  " nil) string)
5074   :group 'gnus-thread)
5075
5076 (defcustom gnus-sum-thread-tree-single-indent ""
5077   "With %B spec, used for a thread with just one message.
5078 If nil, use subject instead."
5079   :version "22.1"
5080   :type '(radio (const :format "%v  " nil) string)
5081   :group 'gnus-thread)
5082
5083 (defcustom gnus-sum-thread-tree-vertical "| "
5084   "With %B spec, used for drawing a vertical line."
5085   :version "22.1"
5086   :type 'string
5087   :group 'gnus-thread)
5088
5089 (defcustom gnus-sum-thread-tree-indent "  "
5090   "With %B spec, used for indenting."
5091   :version "22.1"
5092   :type 'string
5093   :group 'gnus-thread)
5094
5095 (defcustom gnus-sum-thread-tree-leaf-with-other "+-> "
5096   "With %B spec, used for a leaf with brothers."
5097   :version "22.1"
5098   :type 'string
5099   :group 'gnus-thread)
5100
5101 (defcustom gnus-sum-thread-tree-single-leaf "\\-> "
5102   "With %B spec, used for a leaf without brothers."
5103   :version "22.1"
5104   :type 'string
5105   :group 'gnus-thread)
5106
5107 (defcustom gnus-summary-display-while-building nil
5108   "If non-nil, show and update the summary buffer as it's being built.
5109 If the value is t, update the buffer after every line is inserted.  If
5110 the value is an integer (N), update the display every N lines."
5111   :version "22.1"
5112   :group 'gnus-thread
5113   :type '(choice (const :tag "off" nil)
5114                  number
5115                  (const :tag "frequently" t)))
5116
5117 (defun gnus-summary-prepare-threads (threads)
5118   "Prepare summary buffer from THREADS and indentation LEVEL.
5119 THREADS is either a list of `(PARENT [(CHILD1 [(GRANDCHILD ...]...) ...])'
5120 or a straight list of headers."
5121   (gnus-message 7 "Generating summary...")
5122
5123   (setq gnus-newsgroup-threads threads)
5124   (beginning-of-line)
5125
5126   (let ((gnus-tmp-level 0)
5127         (default-score (or gnus-summary-default-score 0))
5128         (gnus-visual-p (gnus-visual-p 'summary-highlight 'highlight))
5129         (building-line-count gnus-summary-display-while-building)
5130         (building-count (integerp gnus-summary-display-while-building))
5131         thread number subject stack state gnus-tmp-gathered beg-match
5132         new-roots gnus-tmp-new-adopts thread-end simp-subject
5133         gnus-tmp-header gnus-tmp-unread gnus-tmp-downloaded
5134         gnus-tmp-replied gnus-tmp-subject-or-nil
5135         gnus-tmp-dummy gnus-tmp-indentation gnus-tmp-lines gnus-tmp-score
5136         gnus-tmp-score-char gnus-tmp-from gnus-tmp-name
5137         gnus-tmp-number gnus-tmp-opening-bracket gnus-tmp-closing-bracket
5138         tree-stack)
5139
5140     (setq gnus-tmp-prev-subject nil
5141           gnus-tmp-thread-tree-header-string "")
5142
5143     (if (vectorp (car threads))
5144         ;; If this is a straight (sic) list of headers, then a
5145         ;; threaded summary display isn't required, so we just create
5146         ;; an unthreaded one.
5147         (gnus-summary-prepare-unthreaded threads)
5148
5149       ;; Do the threaded display.
5150
5151       (if gnus-summary-display-while-building
5152           (switch-to-buffer (buffer-name)))
5153       (while (or threads stack gnus-tmp-new-adopts new-roots)
5154
5155         (if (and (= gnus-tmp-level 0)
5156                  (or (not stack)
5157                      (= (caar stack) 0))
5158                  (not gnus-tmp-false-parent)
5159                  (or gnus-tmp-new-adopts new-roots))
5160             (if gnus-tmp-new-adopts
5161                 (setq gnus-tmp-level (if gnus-tmp-root-expunged 0 1)
5162                       thread (list (car gnus-tmp-new-adopts))
5163                       gnus-tmp-header (caar thread)
5164                       gnus-tmp-new-adopts (cdr gnus-tmp-new-adopts))
5165               (when new-roots
5166                 (setq thread (list (car new-roots))
5167                       gnus-tmp-header (caar thread)
5168                       new-roots (cdr new-roots))))
5169
5170           (if threads
5171               ;; If there are some threads, we do them before the
5172               ;; threads on the stack.
5173               (setq thread threads
5174                     gnus-tmp-header (caar thread))
5175             ;; There were no current threads, so we pop something off
5176             ;; the stack.
5177             (setq state (car stack)
5178                   gnus-tmp-level (car state)
5179                   tree-stack (cadr state)
5180                   thread (caddr state)
5181                   stack (cdr stack)
5182                   gnus-tmp-header (caar thread))))
5183
5184         (setq gnus-tmp-false-parent nil)
5185         (setq gnus-tmp-root-expunged nil)
5186         (setq thread-end nil)
5187
5188         (if (stringp gnus-tmp-header)
5189             ;; The header is a dummy root.
5190             (cond
5191              ((eq gnus-summary-make-false-root 'adopt)
5192               ;; We let the first article adopt the rest.
5193               (setq gnus-tmp-new-adopts (nconc gnus-tmp-new-adopts
5194                                                (cddar thread)))
5195               (setq gnus-tmp-gathered
5196                     (nconc (mapcar
5197                             (lambda (h) (mail-header-number (car h)))
5198                             (cddar thread))
5199                            gnus-tmp-gathered))
5200               (setq thread (cons (list (caar thread)
5201                                        (cadar thread))
5202                                  (cdr thread)))
5203               (setq gnus-tmp-level -1
5204                     gnus-tmp-false-parent t))
5205              ((eq gnus-summary-make-false-root 'empty)
5206               ;; We print adopted articles with empty subject fields.
5207               (setq gnus-tmp-gathered
5208                     (nconc (mapcar
5209                             (lambda (h) (mail-header-number (car h)))
5210                             (cddar thread))
5211                            gnus-tmp-gathered))
5212               (setq gnus-tmp-level -1))
5213              ((eq gnus-summary-make-false-root 'dummy)
5214               ;; We remember that we probably want to output a dummy
5215               ;; root.
5216               (setq gnus-tmp-dummy-line gnus-tmp-header)
5217               (setq gnus-tmp-prev-subject gnus-tmp-header))
5218              (t
5219               ;; We do not make a root for the gathered
5220               ;; sub-threads at all.
5221               (setq gnus-tmp-level -1)))
5222
5223           (setq number (mail-header-number gnus-tmp-header)
5224                 subject (mail-header-subject gnus-tmp-header)
5225                 simp-subject (gnus-simplify-subject-fully subject))
5226
5227           (cond
5228            ;; If the thread has changed subject, we might want to make
5229            ;; this subthread into a root.
5230            ((and (null gnus-thread-ignore-subject)
5231                  (not (zerop gnus-tmp-level))
5232                  gnus-tmp-prev-subject
5233                  (not (string= gnus-tmp-prev-subject simp-subject)))
5234             (setq new-roots (nconc new-roots (list (car thread)))
5235                   thread-end t
5236                   gnus-tmp-header nil))
5237            ;; If the article lies outside the current limit,
5238            ;; then we do not display it.
5239            ((not (memq number gnus-newsgroup-limit))
5240             (setq gnus-tmp-gathered
5241                   (nconc (mapcar
5242                           (lambda (h) (mail-header-number (car h)))
5243                           (cdar thread))
5244                          gnus-tmp-gathered))
5245             (setq gnus-tmp-new-adopts (if (cdar thread)
5246                                           (append gnus-tmp-new-adopts
5247                                                   (cdar thread))
5248                                         gnus-tmp-new-adopts)
5249                   thread-end t
5250                   gnus-tmp-header nil)
5251             (when (zerop gnus-tmp-level)
5252               (setq gnus-tmp-root-expunged t)))
5253            ;; Perhaps this article is to be marked as read?
5254            ((and gnus-summary-mark-below
5255                  (< (or (cdr (assq number gnus-newsgroup-scored))
5256                         default-score)
5257                     gnus-summary-mark-below)
5258                  ;; Don't touch sparse articles.
5259                  (not (gnus-summary-article-sparse-p number))
5260                  (not (gnus-summary-article-ancient-p number)))
5261             (setq gnus-newsgroup-unreads
5262                   (delq number gnus-newsgroup-unreads))
5263             (if gnus-newsgroup-auto-expire
5264                 (setq gnus-newsgroup-expirable
5265                       (gnus-add-to-sorted-list
5266                        gnus-newsgroup-expirable number))
5267               (push (cons number gnus-low-score-mark)
5268                     gnus-newsgroup-reads))))
5269
5270           (when gnus-tmp-header
5271             ;; We may have an old dummy line to output before this
5272             ;; article.
5273             (when (and gnus-tmp-dummy-line
5274                        (gnus-subject-equal
5275                         gnus-tmp-dummy-line
5276                         (mail-header-subject gnus-tmp-header)))
5277               (gnus-summary-insert-dummy-line
5278                gnus-tmp-dummy-line (mail-header-number gnus-tmp-header))
5279               (setq gnus-tmp-dummy-line nil))
5280
5281             ;; Compute the mark.
5282             (setq gnus-tmp-unread (gnus-article-mark number))
5283
5284             (push (gnus-data-make number gnus-tmp-unread (1+ (point))
5285                                   gnus-tmp-header gnus-tmp-level)
5286                   gnus-newsgroup-data)
5287
5288             ;; Actually insert the line.
5289             (setq
5290              gnus-tmp-subject-or-nil
5291              (cond
5292               ((and gnus-thread-ignore-subject
5293                     gnus-tmp-prev-subject
5294                     (not (string= gnus-tmp-prev-subject simp-subject)))
5295                subject)
5296               ((zerop gnus-tmp-level)
5297                (if (and (eq gnus-summary-make-false-root 'empty)
5298                         (memq number gnus-tmp-gathered)
5299                         gnus-tmp-prev-subject
5300                         (string= gnus-tmp-prev-subject simp-subject))
5301                    gnus-summary-same-subject
5302                  subject))
5303               (t gnus-summary-same-subject)))
5304             (if (and (eq gnus-summary-make-false-root 'adopt)
5305                      (= gnus-tmp-level 1)
5306                      (memq number gnus-tmp-gathered))
5307                 (setq gnus-tmp-opening-bracket ?\<
5308                       gnus-tmp-closing-bracket ?\>)
5309               (setq gnus-tmp-opening-bracket ?\[
5310                     gnus-tmp-closing-bracket ?\]))
5311             (if (>= gnus-tmp-level (length gnus-thread-indent-array))
5312                 (gnus-make-thread-indent-array
5313                  (max (* 2 (length gnus-thread-indent-array))
5314                       gnus-tmp-level)))
5315             (setq
5316              gnus-tmp-indentation
5317              (aref gnus-thread-indent-array gnus-tmp-level)
5318              gnus-tmp-lines (mail-header-lines gnus-tmp-header)
5319              gnus-tmp-score (or (cdr (assq number gnus-newsgroup-scored))
5320                                 gnus-summary-default-score 0)
5321              gnus-tmp-score-char
5322              (if (or (null gnus-summary-default-score)
5323                      (<= (abs (- gnus-tmp-score gnus-summary-default-score))
5324                          gnus-summary-zcore-fuzz))
5325                  ?                      ;Whitespace
5326                (if (< gnus-tmp-score gnus-summary-default-score)
5327                    gnus-score-below-mark gnus-score-over-mark))
5328              gnus-tmp-replied
5329              (cond ((memq number gnus-newsgroup-processable)
5330                     gnus-process-mark)
5331                    ((memq number gnus-newsgroup-cached)
5332                     gnus-cached-mark)
5333                    ((memq number gnus-newsgroup-replied)
5334                     gnus-replied-mark)
5335                    ((memq number gnus-newsgroup-forwarded)
5336                     gnus-forwarded-mark)
5337                    ((memq number gnus-newsgroup-saved)
5338                     gnus-saved-mark)
5339                    ((memq number gnus-newsgroup-recent)
5340                     gnus-recent-mark)
5341                    ((memq number gnus-newsgroup-unseen)
5342                     gnus-unseen-mark)
5343                    (t gnus-no-mark))
5344              gnus-tmp-downloaded
5345              (cond ((memq number gnus-newsgroup-undownloaded)
5346                     gnus-undownloaded-mark)
5347                    (gnus-newsgroup-agentized
5348                     gnus-downloaded-mark)
5349                    (t
5350                     gnus-no-mark))
5351              gnus-tmp-from (mail-header-from gnus-tmp-header)
5352              gnus-tmp-name
5353              (cond
5354               ((string-match "<[^>]+> *$" gnus-tmp-from)
5355                (setq beg-match (match-beginning 0))
5356                (or (and (string-match "^\".+\"" gnus-tmp-from)
5357                         (substring gnus-tmp-from 1 (1- (match-end 0))))
5358                    (substring gnus-tmp-from 0 beg-match)))
5359               ((string-match "(.+)" gnus-tmp-from)
5360                (substring gnus-tmp-from
5361                           (1+ (match-beginning 0)) (1- (match-end 0))))
5362               (t gnus-tmp-from))
5363
5364              ;; Do the %B string
5365              gnus-tmp-thread-tree-header-string
5366              (cond
5367               ((not gnus-show-threads) "")
5368               ((zerop gnus-tmp-level)
5369                (cond ((cdar thread)
5370                       (or gnus-sum-thread-tree-root subject))
5371                      (gnus-tmp-new-adopts
5372                       (or gnus-sum-thread-tree-false-root subject))
5373                      (t
5374                       (or gnus-sum-thread-tree-single-indent subject))))
5375               (t
5376                (concat (apply 'concat
5377                               (mapcar (lambda (item)
5378                                         (if (= item 1)
5379                                             gnus-sum-thread-tree-vertical
5380                                           gnus-sum-thread-tree-indent))
5381                                       (cdr (reverse tree-stack))))
5382                        (if (nth 1 thread)
5383                            gnus-sum-thread-tree-leaf-with-other
5384                          gnus-sum-thread-tree-single-leaf)))))
5385             (when (string= gnus-tmp-name "")
5386               (setq gnus-tmp-name gnus-tmp-from))
5387             (unless (numberp gnus-tmp-lines)
5388               (setq gnus-tmp-lines -1))
5389             (if (= gnus-tmp-lines -1)
5390                 (setq gnus-tmp-lines "?")
5391               (setq gnus-tmp-lines (number-to-string gnus-tmp-lines)))
5392             (gnus-put-text-property
5393              (point)
5394              (progn (eval gnus-summary-line-format-spec) (point))
5395              'gnus-number number)
5396             (when gnus-visual-p
5397               (forward-line -1)
5398               (gnus-summary-highlight-line)
5399               (when gnus-summary-update-hook
5400                 (gnus-run-hooks 'gnus-summary-update-hook))
5401               (forward-line 1))
5402
5403             (setq gnus-tmp-prev-subject simp-subject)))
5404
5405         (when (nth 1 thread)
5406           (push (list (max 0 gnus-tmp-level)
5407                       (copy-sequence tree-stack)
5408                       (nthcdr 1 thread))
5409                 stack))
5410         (push (if (nth 1 thread) 1 0) tree-stack)
5411         (incf gnus-tmp-level)
5412         (setq threads (if thread-end nil (cdar thread)))
5413         (if gnus-summary-display-while-building
5414             (if building-count
5415                 (progn
5416                   ;; use a set frequency
5417                   (setq building-line-count (1- building-line-count))
5418                   (when (= building-line-count 0)
5419                     (sit-for 0)
5420                     (setq building-line-count
5421                           gnus-summary-display-while-building)))
5422               ;; always
5423               (sit-for 0)))
5424         (unless threads
5425           (setq gnus-tmp-level 0)))))
5426   (gnus-message 7 "Generating summary...done"))
5427
5428 (defun gnus-summary-prepare-unthreaded (headers)
5429   "Generate an unthreaded summary buffer based on HEADERS."
5430   (let (header number mark)
5431
5432     (beginning-of-line)
5433
5434     (while headers
5435       ;; We may have to root out some bad articles...
5436       (when (memq (setq number (mail-header-number
5437                                 (setq header (pop headers))))
5438                   gnus-newsgroup-limit)
5439         ;; Mark article as read when it has a low score.
5440         (when (and gnus-summary-mark-below
5441                    (< (or (cdr (assq number gnus-newsgroup-scored))
5442                           gnus-summary-default-score 0)
5443                       gnus-summary-mark-below)
5444                    (not (gnus-summary-article-ancient-p number)))
5445           (setq gnus-newsgroup-unreads
5446                 (delq number gnus-newsgroup-unreads))
5447           (if gnus-newsgroup-auto-expire
5448               (push number gnus-newsgroup-expirable)
5449             (push (cons number gnus-low-score-mark)
5450                   gnus-newsgroup-reads)))
5451
5452         (setq mark (gnus-article-mark number))
5453         (push (gnus-data-make number mark (1+ (point)) header 0)
5454               gnus-newsgroup-data)
5455         (gnus-summary-insert-line
5456          header 0 number
5457          (memq number gnus-newsgroup-undownloaded)
5458          mark (memq number gnus-newsgroup-replied)
5459          (memq number gnus-newsgroup-expirable)
5460          (mail-header-subject header) nil
5461          (cdr (assq number gnus-newsgroup-scored))
5462          (memq number gnus-newsgroup-processable))))))
5463
5464 (defun gnus-summary-remove-list-identifiers ()
5465   "Remove list identifiers in `gnus-list-identifiers' from articles in the current group."
5466   (let ((regexp (if (consp gnus-list-identifiers)
5467                     (mapconcat 'identity gnus-list-identifiers " *\\|")
5468                   gnus-list-identifiers))
5469         changed subject)
5470     (when regexp
5471       (setq regexp (concat "^\\(?:R[Ee]: +\\)*\\(" regexp " *\\)"))
5472       (dolist (header gnus-newsgroup-headers)
5473         (setq subject (mail-header-subject header)
5474               changed nil)
5475         (while (string-match regexp subject)
5476           (setq subject
5477                 (concat (substring subject 0 (match-beginning 1))
5478                         (substring subject (match-end 0)))
5479                 changed t))
5480         (when changed
5481           (when (string-match "^\\(\\(?:R[Ee]: +\\)+\\)R[Ee]: +" subject)
5482             (setq subject
5483                   (concat (substring subject 0 (match-beginning 1))
5484                           (substring subject (match-end 1)))))
5485           (mail-header-set-subject header subject))))))
5486
5487 (defun gnus-fetch-headers (articles &optional limit force-new dependencies)
5488   "Fetch headers of ARTICLES."
5489   (let ((name (gnus-group-decoded-name gnus-newsgroup-name)))
5490     (gnus-message 5 "Fetching headers for %s..." name)
5491     (prog1
5492         (if (eq 'nov
5493                 (setq gnus-headers-retrieved-by
5494                       (gnus-retrieve-headers
5495                        articles gnus-newsgroup-name
5496                        (or limit
5497                            ;; We might want to fetch old headers, but
5498                            ;; not if there is only 1 article.
5499                            (and (or (and
5500                                      (not (eq gnus-fetch-old-headers 'some))
5501                                      (not (numberp gnus-fetch-old-headers)))
5502                                     (> (length articles) 1))
5503                                 gnus-fetch-old-headers)))))
5504             (gnus-get-newsgroup-headers-xover
5505              articles force-new dependencies gnus-newsgroup-name t)
5506           (gnus-get-newsgroup-headers dependencies force-new))
5507       (gnus-message 5 "Fetching headers for %s...done" name))))
5508
5509 (defun gnus-select-newsgroup (group &optional read-all select-articles)
5510   "Select newsgroup GROUP.
5511 If READ-ALL is non-nil, all articles in the group are selected.
5512 If SELECT-ARTICLES, only select those articles from GROUP."
5513   (let* ((entry (gnus-group-entry group))
5514          ;;!!! Dirty hack; should be removed.
5515          (gnus-summary-ignore-duplicates
5516           (if (eq (car (gnus-find-method-for-group group)) 'nnvirtual)
5517               t
5518             gnus-summary-ignore-duplicates))
5519          (info (nth 2 entry))
5520          charset articles fetched-articles cached)
5521
5522     (unless (gnus-check-server
5523              (set (make-local-variable 'gnus-current-select-method)
5524                   (gnus-find-method-for-group group)))
5525       (error "Couldn't open server"))
5526     (setq charset (gnus-group-name-charset gnus-current-select-method group))
5527
5528     (or (and entry (not (eq (car entry) t))) ; Either it's active...
5529         (gnus-activate-group group)     ; Or we can activate it...
5530         (progn                          ; Or we bug out.
5531           (when (equal major-mode 'gnus-summary-mode)
5532             (gnus-kill-buffer (current-buffer)))
5533           (error
5534            "Couldn't activate group %s: %s"
5535            (mm-decode-coding-string group charset)
5536            (mm-decode-coding-string (gnus-status-message group) charset))))
5537
5538     (unless (gnus-request-group group t)
5539       (when (equal major-mode 'gnus-summary-mode)
5540         (gnus-kill-buffer (current-buffer)))
5541       (error "Couldn't request group %s: %s"
5542              (mm-decode-coding-string group charset)
5543              (mm-decode-coding-string (gnus-status-message group) charset)))
5544
5545     (when (and gnus-agent
5546                (gnus-active group))
5547       (gnus-agent-possibly-alter-active group (gnus-active group) info)
5548
5549       (setq gnus-summary-use-undownloaded-faces
5550             (gnus-agent-find-parameter
5551              group
5552              'agent-enable-undownloaded-faces)))
5553
5554     (setq gnus-newsgroup-name group
5555           gnus-newsgroup-unselected nil
5556           gnus-newsgroup-unreads (gnus-list-of-unread-articles group))
5557
5558     (let ((display (gnus-group-find-parameter group 'display)))
5559       (setq gnus-newsgroup-display
5560             (cond
5561              ((not (zerop (or (car-safe read-all) 0)))
5562               ;; The user entered the group with C-u SPC/RET, let's show
5563               ;; all articles.
5564               'gnus-not-ignore)
5565              ((eq display 'all)
5566               'gnus-not-ignore)
5567              ((arrayp display)
5568               (gnus-summary-display-make-predicate (mapcar 'identity display)))
5569              ((numberp display)
5570               ;; The following is probably the "correct" solution, but
5571               ;; it makes Gnus fetch all headers and then limit the
5572               ;; articles (which is slow), so instead we hack the
5573               ;; select-articles parameter instead. -- Simon Josefsson
5574               ;; <jas@kth.se>
5575               ;;
5576               ;; (gnus-byte-compile
5577               ;;  `(lambda () (> number ,(- (cdr (gnus-active group))
5578               ;;                         display)))))
5579               (setq select-articles
5580                     (gnus-uncompress-range
5581                      (cons (let ((tmp (- (cdr (gnus-active group)) display)))
5582                              (if (> tmp 0)
5583                                  tmp
5584                                1))
5585                            (cdr (gnus-active group)))))
5586               nil)
5587              (t
5588               nil))))
5589
5590     (gnus-summary-setup-default-charset)
5591
5592     ;; Kludge to avoid having cached articles nixed out in virtual groups.
5593     (when (gnus-virtual-group-p group)
5594       (setq cached gnus-newsgroup-cached))
5595
5596     (setq gnus-newsgroup-unreads
5597           (gnus-sorted-ndifference
5598            (gnus-sorted-ndifference gnus-newsgroup-unreads
5599                                     gnus-newsgroup-marked)
5600            gnus-newsgroup-dormant))
5601
5602     (setq gnus-newsgroup-processable nil)
5603
5604     (gnus-update-read-articles group gnus-newsgroup-unreads t)
5605
5606     ;; Adjust and set lists of article marks.
5607     (when info
5608       (gnus-adjust-marked-articles info))
5609     (if (setq articles select-articles)
5610         (setq gnus-newsgroup-unselected
5611               (gnus-sorted-difference gnus-newsgroup-unreads articles))
5612       (setq articles (gnus-articles-to-read group read-all)))
5613
5614     (cond
5615      ((null articles)
5616       ;;(gnus-message 3 "Couldn't select newsgroup -- no articles to display")
5617       'quit)
5618      ((eq articles 0) nil)
5619      (t
5620       ;; Init the dependencies hash table.
5621       (setq gnus-newsgroup-dependencies
5622             (gnus-make-hashtable (length articles)))
5623       (gnus-set-global-variables)
5624       ;; Retrieve the headers and read them in.
5625
5626       (setq gnus-newsgroup-headers (gnus-fetch-headers articles))
5627
5628       ;; Kludge to avoid having cached articles nixed out in virtual groups.
5629       (when cached
5630         (setq gnus-newsgroup-cached cached))
5631
5632       ;; Suppress duplicates?
5633       (when gnus-suppress-duplicates
5634         (gnus-dup-suppress-articles))
5635
5636       ;; Set the initial limit.
5637       (setq gnus-newsgroup-limit (copy-sequence articles))
5638       ;; Remove canceled articles from the list of unread articles.
5639       (setq fetched-articles
5640             (mapcar (lambda (headers) (mail-header-number headers))
5641                     gnus-newsgroup-headers))
5642       (setq gnus-newsgroup-articles fetched-articles)
5643       (setq gnus-newsgroup-unreads
5644             (gnus-sorted-nintersection
5645              gnus-newsgroup-unreads fetched-articles))
5646       (gnus-compute-unseen-list)
5647
5648       ;; Removed marked articles that do not exist.
5649       (gnus-update-missing-marks
5650        (gnus-sorted-difference articles fetched-articles))
5651       ;; We might want to build some more threads first.
5652       (when (and gnus-fetch-old-headers
5653                  (eq gnus-headers-retrieved-by 'nov))
5654         (if (eq gnus-fetch-old-headers 'invisible)
5655             (gnus-build-all-threads)
5656           (gnus-build-old-threads)))
5657       ;; Let the Gnus agent mark articles as read.
5658       (when gnus-agent
5659         (gnus-agent-get-undownloaded-list))
5660       ;; Remove list identifiers from subject
5661       (when gnus-list-identifiers
5662         (gnus-summary-remove-list-identifiers))
5663       ;; Check whether auto-expire is to be done in this group.
5664       (setq gnus-newsgroup-auto-expire
5665             (gnus-group-auto-expirable-p group))
5666       ;; Set up the article buffer now, if necessary.
5667       (unless (and gnus-single-article-buffer
5668                    (equal gnus-article-buffer "*Article*"))
5669         (gnus-article-setup-buffer))
5670       ;; First and last article in this newsgroup.
5671       (when gnus-newsgroup-headers
5672         (setq gnus-newsgroup-begin
5673               (mail-header-number (car gnus-newsgroup-headers))
5674               gnus-newsgroup-end
5675               (mail-header-number
5676                (gnus-last-element gnus-newsgroup-headers))))
5677       ;; GROUP is successfully selected.
5678       (or gnus-newsgroup-headers t)))))
5679
5680 (defun gnus-compute-unseen-list ()
5681   ;; The `seen' marks are treated specially.
5682   (if (not gnus-newsgroup-seen)
5683       (setq gnus-newsgroup-unseen gnus-newsgroup-articles)
5684     (setq gnus-newsgroup-unseen
5685           (gnus-inverse-list-range-intersection
5686            gnus-newsgroup-articles gnus-newsgroup-seen))))
5687
5688 (declare-function gnus-get-predicate "gnus-agent" (predicate))
5689
5690 (defun gnus-summary-display-make-predicate (display)
5691   (require 'gnus-agent)
5692   (when (= (length display) 1)
5693     (setq display (car display)))
5694   (unless gnus-summary-display-cache
5695     (dolist (elem (append '((unread . unread)
5696                             (read . read)
5697                             (unseen . unseen))
5698                           gnus-article-mark-lists))
5699       (push (cons (cdr elem)
5700                   (gnus-byte-compile    ;Why bother?
5701                    `(lambda () (gnus-article-marked-p ',(cdr elem)))))
5702             gnus-summary-display-cache)))
5703   (let ((gnus-category-predicate-alist gnus-summary-display-cache)
5704         (gnus-category-predicate-cache gnus-summary-display-cache))
5705     (gnus-get-predicate display)))
5706
5707 ;; Uses the dynamically bound `gnus-number' variable.
5708 (defvar gnus-number)
5709 (defun gnus-article-marked-p (type &optional article)
5710   (let ((article (or article gnus-number)))
5711     (cond
5712      ((eq type 'tick)
5713       (memq article gnus-newsgroup-marked))
5714      ((eq type 'spam)
5715       (memq article gnus-newsgroup-spam-marked))
5716      ((eq type 'unsend)
5717       (memq article gnus-newsgroup-unsendable))
5718      ((eq type 'undownload)
5719       (memq article gnus-newsgroup-undownloaded))
5720      ((eq type 'download)
5721       (memq article gnus-newsgroup-downloadable))
5722      ((eq type 'unread)
5723       (memq article gnus-newsgroup-unreads))
5724      ((eq type 'read)
5725       (memq article gnus-newsgroup-reads))
5726      ((eq type 'dormant)
5727       (memq article gnus-newsgroup-dormant) )
5728      ((eq type 'expire)
5729       (memq article gnus-newsgroup-expirable))
5730      ((eq type 'reply)
5731       (memq article gnus-newsgroup-replied))
5732      ((eq type 'killed)
5733       (memq article gnus-newsgroup-killed))
5734      ((eq type 'bookmark)
5735       (assq article gnus-newsgroup-bookmarks))
5736      ((eq type 'score)
5737       (assq article gnus-newsgroup-scored))
5738      ((eq type 'save)
5739       (memq article gnus-newsgroup-saved))
5740      ((eq type 'cache)
5741       (memq article gnus-newsgroup-cached))
5742      ((eq type 'forward)
5743       (memq article gnus-newsgroup-forwarded))
5744      ((eq type 'seen)
5745       (not (memq article gnus-newsgroup-unseen)))
5746      ((eq type 'recent)
5747       (memq article gnus-newsgroup-recent))
5748      (t t))))
5749
5750 (defun gnus-articles-to-read (group &optional read-all)
5751   "Find out what articles the user wants to read."
5752   (let* ((articles
5753           ;; Select all articles if `read-all' is non-nil, or if there
5754           ;; are no unread articles.
5755           (if (or read-all
5756                   (and (zerop (length gnus-newsgroup-marked))
5757                        (zerop (length gnus-newsgroup-unreads)))
5758                   ;; Fetch all if the predicate is non-nil.
5759                   gnus-newsgroup-display)
5760               ;; We want to select the headers for all the articles in
5761               ;; the group, so we select either all the active
5762               ;; articles in the group, or (if that's nil), the
5763               ;; articles in the cache.
5764               (or
5765                (if gnus-newsgroup-maximum-articles
5766                    (let ((active (gnus-active group)))
5767                      (gnus-uncompress-range
5768                       (cons (max (car active)
5769                                  (- (cdr active)
5770                                     gnus-newsgroup-maximum-articles
5771                                     -1))
5772                             (cdr active))))
5773                  (gnus-uncompress-range (gnus-active group)))
5774                (gnus-cache-articles-in-group group))
5775             ;; Select only the "normal" subset of articles.
5776             (gnus-sorted-nunion
5777              (gnus-sorted-union gnus-newsgroup-dormant gnus-newsgroup-marked)
5778              gnus-newsgroup-unreads)))
5779          (scored-list (gnus-killed-articles gnus-newsgroup-killed articles))
5780          (scored (length scored-list))
5781          (number (length articles))
5782          (marked (+ (length gnus-newsgroup-marked)
5783                     (length gnus-newsgroup-dormant)))
5784          (select
5785           (cond
5786            ((numberp read-all)
5787             read-all)
5788            ((numberp gnus-newsgroup-display)
5789             gnus-newsgroup-display)
5790            (t
5791             (condition-case ()
5792                 (cond
5793                  ((and (or (<= scored marked) (= scored number))
5794                        (numberp gnus-large-newsgroup)
5795                        (> number gnus-large-newsgroup))
5796                   (let* ((cursor-in-echo-area nil)
5797                          (initial (gnus-parameter-large-newsgroup-initial
5798                                    gnus-newsgroup-name))
5799                          (input
5800                           (read-string
5801                            (format
5802                             "How many articles from %s (%s %d): "
5803                             (gnus-group-decoded-name gnus-newsgroup-name)
5804                             (if initial "max" "default")
5805                             number)
5806                            (if initial
5807                                (cons (number-to-string initial)
5808                                      0)))))
5809                     (if (string-match "^[ \t]*$" input) number input)))
5810                  ((and (> scored marked) (< scored number)
5811                        (> (- scored number) 20))
5812                   (let ((input
5813                          (read-string
5814                           (format "%s %s (%d scored, %d total): "
5815                                   "How many articles from"
5816                                   (gnus-group-decoded-name group)
5817                                   scored number))))
5818                     (if (string-match "^[ \t]*$" input)
5819                         number input)))
5820                  (t number))
5821               (quit
5822                (message "Quit getting the articles to read")
5823                nil))))))
5824     (setq select (if (stringp select) (string-to-number select) select))
5825     (if (or (null select) (zerop select))
5826         select
5827       (if (and (not (zerop scored)) (<= (abs select) scored))
5828           (progn
5829             (setq articles (sort scored-list '<))
5830             (setq number (length articles)))
5831         (setq articles (copy-sequence articles)))
5832
5833       (when (< (abs select) number)
5834         (if (< select 0)
5835             ;; Select the N oldest articles.
5836             (setcdr (nthcdr (1- (abs select)) articles) nil)
5837           ;; Select the N most recent articles.
5838           (setq articles (nthcdr (- number select) articles))))
5839       (setq gnus-newsgroup-unselected
5840             (gnus-sorted-difference gnus-newsgroup-unreads articles))
5841       (when gnus-alter-articles-to-read-function
5842         (setq articles
5843               (sort
5844                (funcall gnus-alter-articles-to-read-function
5845                         gnus-newsgroup-name articles)
5846                '<)))
5847       articles)))
5848
5849 (defun gnus-killed-articles (killed articles)
5850   (let (out)
5851     (while articles
5852       (when (inline (gnus-member-of-range (car articles) killed))
5853         (push (car articles) out))
5854       (setq articles (cdr articles)))
5855     out))
5856
5857 (defun gnus-uncompress-marks (marks)
5858   "Uncompress the mark ranges in MARKS."
5859   (let ((uncompressed '(score bookmark))
5860         out)
5861     (while marks
5862       (if (memq (caar marks) uncompressed)
5863           (push (car marks) out)
5864         (push (cons (caar marks) (gnus-uncompress-range (cdar marks))) out))
5865       (setq marks (cdr marks)))
5866     out))
5867
5868 (defun gnus-article-mark-to-type (mark)
5869   "Return the type of MARK."
5870   (or (cadr (assq mark gnus-article-special-mark-lists))
5871       'list))
5872
5873 (defun gnus-article-unpropagatable-p (mark)
5874   "Return whether MARK should be propagated to back end."
5875   (memq mark gnus-article-unpropagated-mark-lists))
5876
5877 (defun gnus-adjust-marked-articles (info)
5878   "Set all article lists and remove all marks that are no longer valid."
5879   (let* ((marked-lists (gnus-info-marks info))
5880          (active (gnus-active (gnus-info-group info)))
5881          (min (car active))
5882          (max (cdr active))
5883          (types gnus-article-mark-lists)
5884          marks var articles article mark mark-type
5885          bgn end)
5886     ;; Hack to avoid adjusting marks for imap.
5887     (when (eq (car (gnus-find-method-for-group (gnus-info-group info)))
5888               'nnimap)
5889       (setq min 1))
5890
5891     (dolist (marks marked-lists)
5892       (setq mark (car marks)
5893             mark-type (gnus-article-mark-to-type mark)
5894             var (intern (format "gnus-newsgroup-%s" (car (rassq mark types)))))
5895
5896       ;; We set the variable according to the type of the marks list,
5897       ;; and then adjust the marks to a subset of the active articles.
5898       (cond
5899        ;; Adjust "simple" lists - compressed yet unsorted
5900        ((eq mark-type 'list)
5901         ;; Simultaneously uncompress and clip to active range
5902         ;; See gnus-uncompress-range for a description of possible marks
5903         (let (l lh)
5904           (if (not (cadr marks))
5905               (set var nil)
5906             (setq articles (if (numberp (cddr marks))
5907                                (list (cdr marks))
5908                              (cdr marks))
5909                   lh (cons nil nil)
5910                   l lh)
5911
5912             (while (setq article (pop articles))
5913               (cond ((consp article)
5914                      (setq bgn (max (car article) min)
5915                            end (min (cdr article) max))
5916                      (while (<= bgn end)
5917                        (setq l (setcdr l (cons bgn nil))
5918                              bgn (1+ bgn))))
5919                     ((and (<= min article)
5920                           (>= max article))
5921                      (setq l (setcdr l (cons article nil))))))
5922             (set var (cdr lh)))))
5923        ;; Adjust assocs.
5924        ((eq mark-type 'tuple)
5925         (set var (setq articles (cdr marks)))
5926         (when (not (listp (cdr (symbol-value var))))
5927           (set var (list (symbol-value var))))
5928         (when (not (listp (cdr articles)))
5929           (setq articles (list articles)))
5930         (while articles
5931           (when (or (not (consp (setq article (pop articles))))
5932                     (< (car article) min)
5933                     (> (car article) max))
5934             (set var (delq article (symbol-value var))))))
5935        ;; Adjust ranges (sloppily).
5936        ((eq mark-type 'range)
5937         (cond
5938          ((eq mark 'seen)
5939           ;; Fix the record for `seen' if it looks like (seen NUM1 . NUM2).
5940           ;; It should be (seen (NUM1 . NUM2)).
5941           (when (numberp (cddr marks))
5942             (setcdr marks (list (cdr marks))))
5943           (setq articles (cdr marks))
5944           (while (and articles
5945                       (or (and (consp (car articles))
5946                                (> min (cdar articles)))
5947                           (and (numberp (car articles))
5948                                (> min (car articles)))))
5949             (pop articles))
5950           (set var articles))))))))
5951
5952 (defun gnus-update-missing-marks (missing)
5953   "Go through the list of MISSING articles and remove them from the mark lists."
5954   (when missing
5955     (let (var m)
5956       ;; Go through all types.
5957       (dolist (elem gnus-article-mark-lists)
5958         (when (eq (gnus-article-mark-to-type (cdr elem)) 'list)
5959           (setq var (intern (format "gnus-newsgroup-%s" (car elem))))
5960           (when (symbol-value var)
5961             ;; This list has articles.  So we delete all missing
5962             ;; articles from it.
5963             (setq m missing)
5964             (while m
5965               (set var (delq (pop m) (symbol-value var))))))))))
5966
5967 (defun gnus-update-marks ()
5968   "Enter the various lists of marked articles into the newsgroup info list."
5969   (let ((types gnus-article-mark-lists)
5970         (info (gnus-get-info gnus-newsgroup-name))
5971         type list newmarked symbol delta-marks)
5972     (when info
5973       ;; Add all marks lists to the list of marks lists.
5974       (while (setq type (pop types))
5975         (setq list (symbol-value
5976                     (setq symbol
5977                           (intern (format "gnus-newsgroup-%s" (car type))))))
5978
5979         (when list
5980           ;; Get rid of the entries of the articles that have the
5981           ;; default score.
5982           (when (and (eq (cdr type) 'score)
5983                      gnus-save-score
5984                      list)
5985             (let* ((arts list)
5986                    (prev (cons nil list))
5987                    (all prev))
5988               (while arts
5989                 (if (or (not (consp (car arts)))
5990                         (= (cdar arts) gnus-summary-default-score))
5991                     (setcdr prev (cdr arts))
5992                   (setq prev arts))
5993                 (setq arts (cdr arts)))
5994               (setq list (cdr all)))))
5995
5996         (when (eq (cdr type) 'seen)
5997           (setq list (gnus-range-add list gnus-newsgroup-unseen)))
5998
5999         (when (eq (gnus-article-mark-to-type (cdr type)) 'list)
6000           (setq list (gnus-compress-sequence (set symbol (sort list '<)) t)))
6001
6002         (when (and (gnus-check-backend-function
6003                     'request-set-mark gnus-newsgroup-name)
6004                    (not (gnus-article-unpropagatable-p (cdr type))))
6005           (let* ((old (cdr (assq (cdr type) (gnus-info-marks info))))
6006                  (del (gnus-remove-from-range (gnus-copy-sequence old) list))
6007                  (add (gnus-remove-from-range
6008                        (gnus-copy-sequence list) old)))
6009             (when add
6010               (push (list add 'add (list (cdr type))) delta-marks))
6011             (when del
6012               ;; Don't delete marks from outside the active range.  This
6013               ;; shouldn't happen, but is a sanity check.
6014               (setq del (gnus-sorted-range-intersection
6015                          (gnus-active gnus-newsgroup-name) del))
6016               (push (list del 'del (list (cdr type))) delta-marks))))
6017
6018         (when list
6019           (push (cons (cdr type) list) newmarked)))
6020
6021       (when delta-marks
6022         (unless (gnus-check-group gnus-newsgroup-name)
6023           (error "Can't open server for %s" gnus-newsgroup-name))
6024         (gnus-request-set-mark gnus-newsgroup-name delta-marks))
6025
6026       ;; Enter these new marks into the info of the group.
6027       (if (nthcdr 3 info)
6028           (setcar (nthcdr 3 info) newmarked)
6029         ;; Add the marks lists to the end of the info.
6030         (when newmarked
6031           (setcdr (nthcdr 2 info) (list newmarked))))
6032
6033       ;; Cut off the end of the info if there's nothing else there.
6034       (let ((i 5))
6035         (while (and (> i 2)
6036                     (not (nth i info)))
6037           (when (nthcdr (decf i) info)
6038             (setcdr (nthcdr i info) nil)))))))
6039
6040 (defun gnus-set-mode-line (where)
6041   "Set the mode line of the article or summary buffers.
6042 If WHERE is `summary', the summary mode line format will be used."
6043   ;; Is this mode line one we keep updated?
6044   (when (and (memq where gnus-updated-mode-lines)
6045              (symbol-value
6046               (intern (format "gnus-%s-mode-line-format-spec" where))))
6047     (let (mode-string)
6048       ;; We evaluate this in the summary buffer since these
6049       ;; variables are buffer-local to that buffer.
6050       (with-current-buffer gnus-summary-buffer
6051         ;; We bind all these variables that are used in the `eval' form
6052         ;; below.
6053         (let* ((mformat (symbol-value
6054                          (intern
6055                           (format "gnus-%s-mode-line-format-spec" where))))
6056                (gnus-tmp-group-name (gnus-mode-string-quote
6057                                      (gnus-group-decoded-name
6058                                       gnus-newsgroup-name)))
6059                (gnus-tmp-article-number (or gnus-current-article 0))
6060                (gnus-tmp-unread gnus-newsgroup-unreads)
6061                (gnus-tmp-unread-and-unticked (length gnus-newsgroup-unreads))
6062                (gnus-tmp-unselected (length gnus-newsgroup-unselected))
6063                (gnus-tmp-unread-and-unselected
6064                 (cond ((and (zerop gnus-tmp-unread-and-unticked)
6065                             (zerop gnus-tmp-unselected))
6066                        "")
6067                       ((zerop gnus-tmp-unselected)
6068                        (format "{%d more}" gnus-tmp-unread-and-unticked))
6069                       (t (format "{%d(+%d) more}"
6070                                  gnus-tmp-unread-and-unticked
6071                                  gnus-tmp-unselected))))
6072                (gnus-tmp-subject
6073                 (if (and gnus-current-headers
6074                          (vectorp gnus-current-headers))
6075                     (gnus-mode-string-quote
6076                      (mail-header-subject gnus-current-headers))
6077                   ""))
6078                bufname-length max-len
6079                gnus-tmp-header) ;; passed as argument to any user-format-funcs
6080           (setq mode-string (eval mformat))
6081           (setq bufname-length (if (string-match "%b" mode-string)
6082                                    (- (length
6083                                        (buffer-name
6084                                         (if (eq where 'summary)
6085                                             nil
6086                                           (get-buffer gnus-article-buffer))))
6087                                       2)
6088                                  0))
6089           (setq max-len (max 4 (if gnus-mode-non-string-length
6090                                    (- (window-width)
6091                                       gnus-mode-non-string-length
6092                                       bufname-length)
6093                                  (length mode-string))))
6094           ;; We might have to chop a bit of the string off...
6095           (when (> (length mode-string) max-len)
6096             (setq mode-string
6097                   (concat (truncate-string-to-width mode-string (- max-len 3))
6098                           "...")))))
6099       ;; Update the mode line.
6100       (setq mode-line-buffer-identification
6101             (gnus-mode-line-buffer-identification (list mode-string)))
6102       (set-buffer-modified-p t))))
6103
6104 (defun gnus-create-xref-hashtb (from-newsgroup headers unreads)
6105   "Go through the HEADERS list and add all Xrefs to a hash table.
6106 The resulting hash table is returned, or nil if no Xrefs were found."
6107   (let* ((virtual (gnus-virtual-group-p from-newsgroup))
6108          (prefix (if virtual "" (gnus-group-real-prefix from-newsgroup)))
6109          (xref-hashtb (gnus-make-hashtable))
6110          start group entry number xrefs header)
6111     (while headers
6112       (setq header (pop headers))
6113       (when (and (setq xrefs (mail-header-xref header))
6114                  (not (memq (setq number (mail-header-number header))
6115                             unreads)))
6116         (setq start 0)
6117         (while (string-match "\\([^ ]+\\)[:/]\\([0-9]+\\)" xrefs start)
6118           (setq start (match-end 0))
6119           (setq group (if prefix
6120                           (concat prefix (substring xrefs (match-beginning 1)
6121                                                     (match-end 1)))
6122                         (substring xrefs (match-beginning 1) (match-end 1))))
6123           (setq number
6124                 (string-to-number (substring xrefs (match-beginning 2)
6125                                           (match-end 2))))
6126           (if (setq entry (gnus-gethash group xref-hashtb))
6127               (setcdr entry (cons number (cdr entry)))
6128             (gnus-sethash group (cons number nil) xref-hashtb)))))
6129     (and start xref-hashtb)))
6130
6131 (defun gnus-mark-xrefs-as-read (from-newsgroup headers unreads)
6132   "Look through all the headers and mark the Xrefs as read."
6133   (let ((virtual (gnus-virtual-group-p from-newsgroup))
6134         name info xref-hashtb idlist method nth4)
6135     (with-current-buffer gnus-group-buffer
6136       (when (setq xref-hashtb
6137                   (gnus-create-xref-hashtb from-newsgroup headers unreads))
6138         (mapatoms
6139          (lambda (group)
6140            (unless (string= from-newsgroup (setq name (symbol-name group)))
6141              (setq idlist (symbol-value group))
6142              ;; Dead groups are not updated.
6143              (and (prog1
6144                       (setq info (gnus-get-info name))
6145                     (when (stringp (setq nth4 (gnus-info-method info)))
6146                       (setq nth4 (gnus-server-to-method nth4))))
6147                   ;; Only do the xrefs if the group has the same
6148                   ;; select method as the group we have just read.
6149                   (or (gnus-methods-equal-p
6150                        nth4 (gnus-find-method-for-group from-newsgroup))
6151                       virtual
6152                       (equal nth4 (setq method (gnus-find-method-for-group
6153                                                 from-newsgroup)))
6154                       (and (equal (car nth4) (car method))
6155                            (equal (nth 1 nth4) (nth 1 method))))
6156                   gnus-use-cross-reference
6157                   (or (not (eq gnus-use-cross-reference t))
6158                       virtual
6159                       ;; Only do cross-references on subscribed
6160                       ;; groups, if that is what is wanted.
6161                       (<= (gnus-info-level info) gnus-level-subscribed))
6162                   (gnus-group-make-articles-read name idlist))))
6163          xref-hashtb)))))
6164
6165 (defun gnus-compute-read-articles (group articles)
6166   (let* ((entry (gnus-group-entry group))
6167          (info (nth 2 entry))
6168          (active (gnus-active group))
6169          ninfo)
6170     (when entry
6171       ;; First peel off all invalid article numbers.
6172       (when active
6173         (let ((ids articles)
6174               id first)
6175           (while (setq id (pop ids))
6176             (when (and first (> id (cdr active)))
6177               ;; We'll end up in this situation in one particular
6178               ;; obscure situation.  If you re-scan a group and get
6179               ;; a new article that is cross-posted to a different
6180               ;; group that has not been re-scanned, you might get
6181               ;; crossposted article that has a higher number than
6182               ;; Gnus believes possible.  So we re-activate this
6183               ;; group as well.  This might mean doing the
6184               ;; crossposting thingy will *increase* the number
6185               ;; of articles in some groups.  Tsk, tsk.
6186               (setq active (or (gnus-activate-group group) active)))
6187             (when (or (> id (cdr active))
6188                       (< id (car active)))
6189               (setq articles (delq id articles))))))
6190       ;; If the read list is nil, we init it.
6191       (if (and active
6192                (null (gnus-info-read info))
6193                (> (car active) 1))
6194           (setq ninfo (cons 1 (1- (car active))))
6195         (setq ninfo (gnus-info-read info)))
6196       ;; Then we add the read articles to the range.
6197       (gnus-add-to-range
6198        ninfo (setq articles (sort articles '<))))))
6199
6200 (defun gnus-group-make-articles-read (group articles)
6201   "Update the info of GROUP to say that ARTICLES are read."
6202   (let* ((num 0)
6203          (entry (gnus-group-entry group))
6204          (info (nth 2 entry))
6205          (active (gnus-active group))
6206          range)
6207     (if (not entry)
6208         ;; Group that Gnus doesn't know exists, but still allow the
6209         ;; backend to set marks.
6210         (gnus-request-set-mark
6211          group (list (list (gnus-compress-sequence (sort articles #'<))
6212                            'add '(read))))
6213       ;; Normal, subscribed groups.
6214       (setq range (gnus-compute-read-articles group articles))
6215       (with-current-buffer gnus-group-buffer
6216         (gnus-undo-register
6217           `(progn
6218              (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
6219              (gnus-info-set-read ',info ',(gnus-info-read info))
6220              (gnus-get-unread-articles-in-group ',info (gnus-active ,group))
6221              (gnus-request-set-mark ,group (list (list ',range 'del '(read))))
6222              (gnus-group-update-group ,group t))))
6223       ;; Add the read articles to the range.
6224       (gnus-info-set-read info range)
6225       (gnus-request-set-mark group (list (list range 'add '(read))))
6226       ;; Then we have to re-compute how many unread
6227       ;; articles there are in this group.
6228       (when active
6229         (cond
6230          ((not range)
6231           (setq num (- (1+ (cdr active)) (car active))))
6232          ((not (listp (cdr range)))
6233           (setq num (- (cdr active) (- (1+ (cdr range))
6234                                        (car range)))))
6235          (t
6236           (while range
6237             (if (numberp (car range))
6238                 (setq num (1+ num))
6239               (setq num (+ num (- (1+ (cdar range)) (caar range)))))
6240             (setq range (cdr range)))
6241           (setq num (- (cdr active) num))))
6242         ;; Update the number of unread articles.
6243         (setcar entry num)
6244         ;; Update the group buffer.
6245         (unless (gnus-ephemeral-group-p group)
6246           (gnus-group-update-group group t))))))
6247
6248 (defun gnus-get-newsgroup-headers (&optional dependencies force-new)
6249   (let ((cur nntp-server-buffer)
6250         (dependencies
6251          (or dependencies
6252              (with-current-buffer gnus-summary-buffer
6253                gnus-newsgroup-dependencies)))
6254         headers id end ref number
6255         (mail-parse-charset gnus-newsgroup-charset)
6256         (mail-parse-ignored-charsets
6257          (save-current-buffer (condition-case nil
6258                                   (set-buffer gnus-summary-buffer)
6259                                 (error))
6260                               gnus-newsgroup-ignored-charsets)))
6261     (with-current-buffer nntp-server-buffer
6262       ;; Translate all TAB characters into SPACE characters.
6263       (subst-char-in-region (point-min) (point-max) ?\t ?  t)
6264       (subst-char-in-region (point-min) (point-max) ?\r ?  t)
6265       (ietf-drums-unfold-fws)
6266       (gnus-run-hooks 'gnus-parse-headers-hook)
6267       (let ((case-fold-search t)
6268             in-reply-to header p lines chars)
6269         (goto-char (point-min))
6270         ;; Search to the beginning of the next header.  Error messages
6271         ;; do not begin with 2 or 3.
6272         (while (re-search-forward "^[23][0-9]+ " nil t)
6273           (setq id nil
6274                 ref nil)
6275           ;; This implementation of this function, with nine
6276           ;; search-forwards instead of the one re-search-forward and
6277           ;; a case (which basically was the old function) is actually
6278           ;; about twice as fast, even though it looks messier.  You
6279           ;; can't have everything, I guess.  Speed and elegance
6280           ;; doesn't always go hand in hand.
6281           (setq
6282            header
6283            (vector
6284             ;; Number.
6285             (prog1
6286                 (setq number (read cur))
6287               (end-of-line)
6288               (setq p (point))
6289               (narrow-to-region (point)
6290                                 (or (and (search-forward "\n.\n" nil t)
6291                                          (- (point) 2))
6292                                     (point))))
6293             ;; Subject.
6294             (progn
6295               (goto-char p)
6296               (if (search-forward "\nsubject:" nil t)
6297                   (funcall gnus-decode-encoded-word-function
6298                            (nnheader-header-value))
6299                 "(none)"))
6300             ;; From.
6301             (progn
6302               (goto-char p)
6303               (if (search-forward "\nfrom:" nil t)
6304                   (funcall gnus-decode-encoded-address-function
6305                            (nnheader-header-value))
6306                 "(nobody)"))
6307             ;; Date.
6308             (progn
6309               (goto-char p)
6310               (if (search-forward "\ndate:" nil t)
6311                   (nnheader-header-value) ""))
6312             ;; Message-ID.
6313             (progn
6314               (goto-char p)
6315               (setq id (if (re-search-forward
6316                             "^message-id: *\\(<[^\n\t> ]+>\\)" nil t)
6317                            ;; We do it this way to make sure the Message-ID
6318                            ;; is (somewhat) syntactically valid.
6319                            (buffer-substring (match-beginning 1)
6320                                              (match-end 1))
6321                          ;; If there was no message-id, we just fake one
6322                          ;; to make subsequent routines simpler.
6323                          (nnheader-generate-fake-message-id number))))
6324             ;; References.
6325             (progn
6326               (goto-char p)
6327               (if (search-forward "\nreferences:" nil t)
6328                   (progn
6329                     (setq end (point))
6330                     (prog1
6331                         (nnheader-header-value)
6332                       (setq ref
6333                             (buffer-substring
6334                              (progn
6335                                (end-of-line)
6336                                (search-backward ">" end t)
6337                                (1+ (point)))
6338                              (progn
6339                                (search-backward "<" end t)
6340                                (point))))))
6341                 ;; Get the references from the in-reply-to header if there
6342                 ;; were no references and the in-reply-to header looks
6343                 ;; promising.
6344                 (if (and (search-forward "\nin-reply-to:" nil t)
6345                          (setq in-reply-to (nnheader-header-value))
6346                          (string-match "<[^>]+>" in-reply-to))
6347                     (let (ref2)
6348                       (setq ref (substring in-reply-to (match-beginning 0)
6349                                            (match-end 0)))
6350                       (while (string-match "<[^>]+>" in-reply-to (match-end 0))
6351                         (setq ref2 (substring in-reply-to (match-beginning 0)
6352                                               (match-end 0)))
6353                         (when (> (length ref2) (length ref))
6354                           (setq ref ref2)))
6355                       ref)
6356                   (setq ref nil))))
6357             ;; Chars.
6358             (progn
6359               (goto-char p)
6360               (if (search-forward "\nchars: " nil t)
6361                   (if (numberp (setq chars (ignore-errors (read cur))))
6362                       chars -1)
6363                 -1))
6364             ;; Lines.
6365             (progn
6366               (goto-char p)
6367               (if (search-forward "\nlines: " nil t)
6368                   (if (numberp (setq lines (ignore-errors (read cur))))
6369                       lines -1)
6370                 -1))
6371             ;; Xref.
6372             (progn
6373               (goto-char p)
6374               (and (search-forward "\nxref:" nil t)
6375                    (nnheader-header-value)))
6376             ;; Extra.
6377             (when gnus-extra-headers
6378               (let ((extra gnus-extra-headers)
6379                     out)
6380                 (while extra
6381                   (goto-char p)
6382                   (when (search-forward
6383                          (concat "\n" (symbol-name (car extra)) ":") nil t)
6384                     (push (cons (car extra) (nnheader-header-value))
6385                           out))
6386                   (pop extra))
6387                 out))))
6388           (when (equal id ref)
6389             (setq ref nil))
6390
6391           (when gnus-alter-header-function
6392             (funcall gnus-alter-header-function header)
6393             (setq id (mail-header-id header)
6394                   ref (gnus-parent-id (mail-header-references header))))
6395
6396           (when (setq header
6397                       (gnus-dependencies-add-header
6398                        header dependencies force-new))
6399             (push header headers))
6400           (goto-char (point-max))
6401           (widen))
6402         (nreverse headers)))))
6403
6404 ;; Goes through the xover lines and returns a list of vectors
6405 (defun gnus-get-newsgroup-headers-xover (sequence &optional
6406                                                   force-new dependencies
6407                                                   group also-fetch-heads)
6408   "Parse the news overview data in the server buffer.
6409 Return a list of headers that match SEQUENCE (see
6410 `nntp-retrieve-headers')."
6411   ;; Get the Xref when the users reads the articles since most/some
6412   ;; NNTP servers do not include Xrefs when using XOVER.
6413   (setq gnus-article-internal-prepare-hook '(gnus-article-get-xrefs))
6414   (let ((mail-parse-charset gnus-newsgroup-charset)
6415         (mail-parse-ignored-charsets gnus-newsgroup-ignored-charsets)
6416         (cur nntp-server-buffer)
6417         (dependencies (or dependencies gnus-newsgroup-dependencies))
6418         (allp (cond
6419                ((eq gnus-read-all-available-headers t)
6420                 t)
6421                ((and (stringp gnus-read-all-available-headers)
6422                      group)
6423                 (string-match gnus-read-all-available-headers group))
6424                (t
6425                 nil)))
6426         number headers header)
6427     (with-current-buffer nntp-server-buffer
6428       (subst-char-in-region (point-min) (point-max) ?\r ?  t)
6429       ;; Allow the user to mangle the headers before parsing them.
6430       (gnus-run-hooks 'gnus-parse-headers-hook)
6431       (goto-char (point-min))
6432       (gnus-parse-without-error
6433         (while (and (or sequence allp)
6434                     (not (eobp)))
6435           (setq number (read cur))
6436           (when (not allp)
6437             (while (and sequence
6438                         (< (car sequence) number))
6439               (setq sequence (cdr sequence))))
6440           (when (and (or allp
6441                          (and sequence
6442                               (eq number (car sequence))))
6443                      (progn
6444                        (setq sequence (cdr sequence))
6445                        (setq header (inline
6446                                       (gnus-nov-parse-line
6447                                        number dependencies force-new)))))
6448             (push header headers))
6449           (forward-line 1)))
6450       ;; A common bug in inn is that if you have posted an article and
6451       ;; then retrieves the active file, it will answer correctly --
6452       ;; the new article is included.  However, a NOV entry for the
6453       ;; article may not have been generated yet, so this may fail.
6454       ;; We work around this problem by retrieving the last few
6455       ;; headers using HEAD.
6456       (if (or (not also-fetch-heads)
6457               (not sequence))
6458           ;; We (probably) got all the headers.
6459           (nreverse headers)
6460         (let ((gnus-nov-is-evil t))
6461           (nconc
6462            (nreverse headers)
6463            (when (eq (gnus-retrieve-headers sequence group) 'headers)
6464              (gnus-get-newsgroup-headers))))))))
6465
6466 (defun gnus-article-get-xrefs ()
6467   "Fill in the Xref value in `gnus-current-headers', if necessary.
6468 This is meant to be called in `gnus-article-internal-prepare-hook'."
6469   (let ((headers (with-current-buffer gnus-summary-buffer
6470                    gnus-current-headers)))
6471     (or (not gnus-use-cross-reference)
6472         (not headers)
6473         (and (mail-header-xref headers)
6474              (not (string= (mail-header-xref headers) "")))
6475         (let ((case-fold-search t)
6476               xref)
6477           (save-restriction
6478             (nnheader-narrow-to-headers)
6479             (goto-char (point-min))
6480             (when (or (and (not (eobp))
6481                            (eq (downcase (char-after)) ?x)
6482                            (looking-at "Xref:"))
6483                       (search-forward "\nXref:" nil t))
6484               (goto-char (1+ (match-end 0)))
6485               (setq xref (buffer-substring (point) (point-at-eol)))
6486               (mail-header-set-xref headers xref)))))))
6487
6488 (defun gnus-summary-insert-subject (id &optional old-header use-old-header)
6489   "Find article ID and insert the summary line for that article.
6490 OLD-HEADER can either be a header or a line number to insert
6491 the subject line on."
6492   (let* ((line (and (numberp old-header) old-header))
6493          (old-header (and (vectorp old-header) old-header))
6494          (header (cond ((and old-header use-old-header)
6495                         old-header)
6496                        ((and (numberp id)
6497                              (gnus-number-to-header id))
6498                         (gnus-number-to-header id))
6499                        (t
6500                         (gnus-read-header id))))
6501          (number (and (numberp id) id))
6502          d)
6503     (when header
6504       ;; Rebuild the thread that this article is part of and go to the
6505       ;; article we have fetched.
6506       (when (and (not gnus-show-threads)
6507                  old-header)
6508         (when (and number
6509                    (setq d (gnus-data-find (mail-header-number old-header))))
6510           (goto-char (gnus-data-pos d))
6511           (gnus-data-remove
6512            number
6513            (- (point-at-bol)
6514               (prog1
6515                   (1+ (point-at-eol))
6516                 (gnus-delete-line))))))
6517       ;; Remove list identifiers from subject.
6518       (when gnus-list-identifiers
6519         (let ((gnus-newsgroup-headers (list header)))
6520           (gnus-summary-remove-list-identifiers)))
6521       (when old-header
6522         (mail-header-set-number header (mail-header-number old-header)))
6523       (setq gnus-newsgroup-sparse
6524             (delq (setq number (mail-header-number header))
6525                   gnus-newsgroup-sparse))
6526       (setq gnus-newsgroup-ancient (delq number gnus-newsgroup-ancient))
6527       (push number gnus-newsgroup-limit)
6528       (gnus-rebuild-thread (mail-header-id header) line)
6529       (gnus-summary-goto-subject number nil t))
6530     (when (and (numberp number)
6531                (> number 0))
6532       ;; We have to update the boundaries even if we can't fetch the
6533       ;; article if ID is a number -- so that the next `P' or `N'
6534       ;; command will fetch the previous (or next) article even
6535       ;; if the one we tried to fetch this time has been canceled.
6536       (when (> number gnus-newsgroup-end)
6537         (setq gnus-newsgroup-end number))
6538       (when (< number gnus-newsgroup-begin)
6539         (setq gnus-newsgroup-begin number))
6540       (setq gnus-newsgroup-unselected
6541             (delq number gnus-newsgroup-unselected)))
6542     ;; Report back a success?
6543     (and header (mail-header-number header))))
6544
6545 ;;; Process/prefix in the summary buffer
6546
6547 (defun gnus-summary-work-articles (n)
6548   "Return a list of articles to be worked upon.
6549 The prefix argument, the list of process marked articles, and the
6550 current article will be taken into consideration."
6551   (with-current-buffer gnus-summary-buffer
6552     (cond
6553      (n
6554       ;; A numerical prefix has been given.
6555       (setq n (prefix-numeric-value n))
6556       (let ((backward (< n 0))
6557             (n (abs (prefix-numeric-value n)))
6558             articles article)
6559         (save-excursion
6560           (while
6561               (and (> n 0)
6562                    (push (setq article (gnus-summary-article-number))
6563                          articles)
6564                    (if backward
6565                        (gnus-summary-find-prev nil article)
6566                      (gnus-summary-find-next nil article)))
6567             (decf n)))
6568         (nreverse articles)))
6569      ((and (gnus-region-active-p) (mark))
6570       (message "region active")
6571       ;; Work on the region between point and mark.
6572       (let ((max (max (point) (mark)))
6573             articles article)
6574         (save-excursion
6575           (goto-char (min (point) (mark)))
6576           (while
6577               (and
6578                (push (setq article (gnus-summary-article-number)) articles)
6579                (gnus-summary-find-next nil article)
6580                (< (point) max)))
6581           (nreverse articles))))
6582      (gnus-newsgroup-processable
6583       ;; There are process-marked articles present.
6584       ;; Save current state.
6585       (gnus-summary-save-process-mark)
6586       ;; Return the list.
6587       (reverse gnus-newsgroup-processable))
6588      (t
6589       ;; Just return the current article.
6590       (list (gnus-summary-article-number))))))
6591
6592 (defmacro gnus-summary-iterate (arg &rest forms)
6593   "Iterate over the process/prefixed articles and do FORMS.
6594 ARG is the interactive prefix given to the command.  FORMS will be
6595 executed with point over the summary line of the articles."
6596   (let ((articles (make-symbol "gnus-summary-iterate-articles")))
6597     `(let ((,articles (gnus-summary-work-articles ,arg)))
6598        (while ,articles
6599          (gnus-summary-goto-subject (car ,articles))
6600          ,@forms
6601          (pop ,articles)))))
6602
6603 (put 'gnus-summary-iterate 'lisp-indent-function 1)
6604 (put 'gnus-summary-iterate 'edebug-form-spec '(form body))
6605
6606 (defun gnus-summary-save-process-mark ()
6607   "Push the current set of process marked articles on the stack."
6608   (interactive)
6609   (push (copy-sequence gnus-newsgroup-processable)
6610         gnus-newsgroup-process-stack))
6611
6612 (defun gnus-summary-kill-process-mark ()
6613   "Push the current set of process marked articles on the stack and unmark."
6614   (interactive)
6615   (gnus-summary-save-process-mark)
6616   (gnus-summary-unmark-all-processable))
6617
6618 (defun gnus-summary-yank-process-mark ()
6619   "Pop the last process mark state off the stack and restore it."
6620   (interactive)
6621   (unless gnus-newsgroup-process-stack
6622     (error "Empty mark stack"))
6623   (gnus-summary-process-mark-set (pop gnus-newsgroup-process-stack)))
6624
6625 (defun gnus-summary-process-mark-set (set)
6626   "Make SET into the current process marked articles."
6627   (gnus-summary-unmark-all-processable)
6628   (mapc 'gnus-summary-set-process-mark set))
6629
6630 ;;; Searching and stuff
6631
6632 (defun gnus-summary-search-group (&optional backward use-level)
6633   "Search for next unread newsgroup.
6634 If optional argument BACKWARD is non-nil, search backward instead."
6635   (with-current-buffer gnus-group-buffer
6636     (when (gnus-group-search-forward
6637            backward nil (if use-level (gnus-group-group-level) nil))
6638       (gnus-group-group-name))))
6639
6640 (defun gnus-summary-best-group (&optional exclude-group)
6641   "Find the name of the best unread group.
6642 If EXCLUDE-GROUP, do not go to this group."
6643   (with-current-buffer gnus-group-buffer
6644     (save-excursion
6645       (gnus-group-best-unread-group exclude-group))))
6646
6647 (defun gnus-summary-find-next (&optional unread article backward)
6648   (if backward
6649       (gnus-summary-find-prev unread article)
6650     (let* ((dummy (gnus-summary-article-intangible-p))
6651            (article (or article (gnus-summary-article-number)))
6652            (data (gnus-data-find-list article))
6653            result)
6654       (when (and (not dummy)
6655                  (or (not gnus-summary-check-current)
6656                      (not unread)
6657                      (not (gnus-data-unread-p (car data)))))
6658         (setq data (cdr data)))
6659       (when (setq result
6660                   (if unread
6661                       (progn
6662                         (while data
6663                           (unless (memq (gnus-data-number (car data))
6664                                         (cond
6665                                          ((eq gnus-auto-goto-ignores
6666                                               'always-undownloaded)
6667                                           gnus-newsgroup-undownloaded)
6668                                          (gnus-plugged
6669                                           nil)
6670                                          ((eq gnus-auto-goto-ignores
6671                                               'unfetched)
6672                                           gnus-newsgroup-unfetched)
6673                                          ((eq gnus-auto-goto-ignores
6674                                               'undownloaded)
6675                                           gnus-newsgroup-undownloaded)))
6676                             (when (gnus-data-unread-p (car data))
6677                               (setq result (car data)
6678                                     data nil)))
6679                           (setq data (cdr data)))
6680                         result)
6681                     (car data)))
6682         (goto-char (gnus-data-pos result))
6683         (gnus-data-number result)))))
6684
6685 (defun gnus-summary-find-prev (&optional unread article)
6686   (let* ((eobp (eobp))
6687          (article (or article (gnus-summary-article-number)))
6688          (data (gnus-data-find-list article (gnus-data-list 'rev)))
6689          result)
6690     (when (and (not eobp)
6691                (or (not gnus-summary-check-current)
6692                    (not unread)
6693                    (not (gnus-data-unread-p (car data)))))
6694       (setq data (cdr data)))
6695     (when (setq result
6696                 (if unread
6697                     (progn
6698                       (while data
6699                         (unless (memq (gnus-data-number (car data))
6700                                       (cond
6701                                        ((eq gnus-auto-goto-ignores
6702                                             'always-undownloaded)
6703                                         gnus-newsgroup-undownloaded)
6704                                        (gnus-plugged
6705                                         nil)
6706                                        ((eq gnus-auto-goto-ignores
6707                                             'unfetched)
6708                                         gnus-newsgroup-unfetched)
6709                                        ((eq gnus-auto-goto-ignores
6710                                             'undownloaded)
6711                                         gnus-newsgroup-undownloaded)))
6712                           (when (gnus-data-unread-p (car data))
6713                             (setq result (car data)
6714                                   data nil)))
6715                         (setq data (cdr data)))
6716                       result)
6717                   (car data)))
6718       (goto-char (gnus-data-pos result))
6719       (gnus-data-number result))))
6720
6721 (defun gnus-summary-find-subject (subject &optional unread backward article)
6722   (let* ((simp-subject (gnus-simplify-subject-fully subject))
6723          (article (or article (gnus-summary-article-number)))
6724          (articles (gnus-data-list backward))
6725          (arts (gnus-data-find-list article articles))
6726          result)
6727     (when (or (not gnus-summary-check-current)
6728               (not unread)
6729               (not (gnus-data-unread-p (car arts))))
6730       (setq arts (cdr arts)))
6731     (while arts
6732       (and (or (not unread)
6733                (gnus-data-unread-p (car arts)))
6734            (vectorp (gnus-data-header (car arts)))
6735            (gnus-subject-equal
6736             simp-subject (mail-header-subject (gnus-data-header (car arts))) t)
6737            (setq result (car arts)
6738                  arts nil))
6739       (setq arts (cdr arts)))
6740     (and result
6741          (goto-char (gnus-data-pos result))
6742          (gnus-data-number result))))
6743
6744 (defun gnus-summary-search-forward (&optional unread subject backward)
6745   "Search forward for an article.
6746 If UNREAD, look for unread articles.  If SUBJECT, look for
6747 articles with that subject.  If BACKWARD, search backward instead."
6748   (cond (subject (gnus-summary-find-subject subject unread backward))
6749         (backward (gnus-summary-find-prev unread))
6750         (t (gnus-summary-find-next unread))))
6751
6752 (defun gnus-recenter (&optional n)
6753   "Center point in window and redisplay frame.
6754 Also do horizontal recentering."
6755   (interactive "P")
6756   (when (and gnus-auto-center-summary
6757              (not (eq gnus-auto-center-summary 'vertical)))
6758     (gnus-horizontal-recenter))
6759   (if (fboundp 'recenter-top-bottom)
6760       (recenter-top-bottom n)
6761     (recenter n)))
6762
6763 (put 'gnus-recenter 'isearch-scroll t)
6764
6765 (defun gnus-forward-line-ignore-invisible (n)
6766   "Move N lines forward (backward if N is negative).
6767 Like forward-line, but skip over (and don't count) invisible lines."
6768   (let (done)
6769     (while (and (> n 0) (not done))
6770       ;; If the following character is currently invisible,
6771       ;; skip all characters with that same `invisible' property value.
6772       (while (gnus-invisible-p (point))
6773         (goto-char (gnus-next-char-property-change (point))))
6774       (forward-line 1)
6775       (if (eobp)
6776           (setq done t)
6777         (setq n (1- n))))
6778     (while (and (< n 0) (not done))
6779       (forward-line -1)
6780       (if (bobp) (setq done t)
6781         (setq n (1+ n))
6782         (while (and (not (bobp)) (gnus-invisible-p (1- (point))))
6783           (goto-char (gnus-previous-char-property-change (point))))))))
6784
6785 (defun gnus-summary-recenter ()
6786   "Center point in the summary window.
6787 If `gnus-auto-center-summary' is nil, or the article buffer isn't
6788 displayed, no centering will be performed."
6789   ;; Suggested by earle@mahendo.JPL.NASA.GOV (Greg Earle).
6790   ;; Recenter only when requested.  Suggested by popovich@park.cs.columbia.edu.
6791   (interactive)
6792   ;; The user has to want it.
6793   (when gnus-auto-center-summary
6794     (let* ((top (cond ((< (window-height) 4) 0)
6795                       ((< (window-height) 7) 1)
6796                       (t (if (numberp gnus-auto-center-summary)
6797                              gnus-auto-center-summary
6798                            (/ (1- (window-height)) 2)))))
6799            (height (1- (window-height)))
6800            (bottom (save-excursion
6801                      (goto-char (point-max))
6802                      (gnus-forward-line-ignore-invisible (- height))
6803                      (point)))
6804            (window (get-buffer-window (current-buffer))))
6805       (when (get-buffer-window gnus-article-buffer)
6806         ;; Only do recentering when the article buffer is displayed,
6807         ;; Set the window start to either `bottom', which is the biggest
6808         ;; possible valid number, or the second line from the top,
6809         ;; whichever is the least.
6810         (let ((top-pos (save-excursion
6811                          (gnus-forward-line-ignore-invisible (- top))
6812                          (point))))
6813           (if (> bottom top-pos)
6814               ;; Keep the second line from the top visible
6815               (set-window-start window top-pos)
6816             ;; Try to keep the bottom line visible; if it's partially
6817             ;; obscured, either scroll one more line to make it fully
6818             ;; visible, or revert to using TOP-POS.
6819             (save-excursion
6820               (goto-char (point-max))
6821               (gnus-forward-line-ignore-invisible -1)
6822               (let ((last-line-start (point)))
6823                 (goto-char bottom)
6824                 (set-window-start window (point) t)
6825                 (when (not (pos-visible-in-window-p last-line-start window))
6826                   (gnus-forward-line-ignore-invisible 1)
6827                   (set-window-start window (min (point) top-pos) t)))))))
6828       ;; Do horizontal recentering while we're at it.
6829       (when (and (get-buffer-window (current-buffer) t)
6830                  (not (eq gnus-auto-center-summary 'vertical)))
6831         (let ((selected (selected-window)))
6832           (select-window (get-buffer-window (current-buffer) t))
6833           (gnus-summary-position-point)
6834           (gnus-horizontal-recenter)
6835           (select-window selected))))))
6836
6837 (defun gnus-summary-jump-to-group (newsgroup)
6838   "Move point to NEWSGROUP in group mode buffer."
6839   ;; Keep update point of group mode buffer if visible.
6840   (if (eq (current-buffer) (get-buffer gnus-group-buffer))
6841       (save-window-excursion
6842         ;; Take care of tree window mode.
6843         (when (get-buffer-window gnus-group-buffer)
6844           (pop-to-buffer gnus-group-buffer))
6845         (gnus-group-jump-to-group newsgroup))
6846     (save-excursion
6847       ;; Take care of tree window mode.
6848       (if (get-buffer-window gnus-group-buffer 0)
6849           (pop-to-buffer gnus-group-buffer)
6850         (set-buffer gnus-group-buffer))
6851       (gnus-group-jump-to-group newsgroup))))
6852
6853 ;; This function returns a list of article numbers based on the
6854 ;; difference between the ranges of read articles in this group and
6855 ;; the range of active articles.
6856 (defun gnus-list-of-unread-articles (group)
6857   (let* ((read (gnus-info-read (gnus-get-info group)))
6858          (active (or (gnus-active group) (gnus-activate-group group)))
6859          (last (or (cdr active)
6860                    (error "Group %s couldn't be activated " group)))
6861          (bottom (if gnus-newsgroup-maximum-articles
6862                      (max (car active)
6863                           (- last gnus-newsgroup-maximum-articles -1))
6864                    (car active)))
6865          first nlast unread)
6866     ;; If none are read, then all are unread.
6867     (if (not read)
6868         (setq first bottom)
6869       ;; If the range of read articles is a single range, then the
6870       ;; first unread article is the article after the last read
6871       ;; article.  Sounds logical, doesn't it?
6872       (if (and (not (listp (cdr read)))
6873                (or (< (car read) bottom)
6874                    (progn (setq read (list read))
6875                           nil)))
6876           (setq first (max bottom (1+ (cdr read))))
6877         ;; `read' is a list of ranges.
6878         (when (/= (setq nlast (or (and (numberp (car read)) (car read))
6879                                   (caar read)))
6880                   1)
6881           (setq first bottom))
6882         (while read
6883           (when first
6884             (while (< first nlast)
6885               (setq unread (cons first unread)
6886                     first (1+ first))))
6887           (setq first (1+ (if (atom (car read)) (car read) (cdar read))))
6888           (setq nlast (if (atom (cadr read)) (cadr read) (caadr read)))
6889           (setq read (cdr read)))))
6890     ;; And add the last unread articles.
6891     (while (<= first last)
6892       (setq unread (cons first unread)
6893             first (1+ first)))
6894     ;; Return the list of unread articles.
6895     (delq 0 (nreverse unread))))
6896
6897 (defun gnus-list-of-read-articles (group)
6898   "Return a list of unread, unticked and non-dormant articles."
6899   (let* ((info (gnus-get-info group))
6900          (marked (gnus-info-marks info))
6901          (active (gnus-active group)))
6902     (and info active
6903          (gnus-list-range-difference
6904           (gnus-list-range-difference
6905            (gnus-sorted-complement
6906             (gnus-uncompress-range
6907              (if gnus-newsgroup-maximum-articles
6908                  (cons (max (car active)
6909                             (- (cdr active)
6910                                gnus-newsgroup-maximum-articles
6911                                -1))
6912                        (cdr active))
6913                active))
6914             (gnus-list-of-unread-articles group))
6915            (cdr (assq 'dormant marked)))
6916           (cdr (assq 'tick marked))))))
6917
6918 ;; This function returns a sequence of article numbers based on the
6919 ;; difference between the ranges of read articles in this group and
6920 ;; the range of active articles.
6921 (defun gnus-sequence-of-unread-articles (group)
6922   (let* ((read (gnus-info-read (gnus-get-info group)))
6923          (active (or (gnus-active group) (gnus-activate-group group)))
6924          (last (cdr active))
6925          (bottom (if gnus-newsgroup-maximum-articles
6926                      (max (car active)
6927                           (- last gnus-newsgroup-maximum-articles -1))
6928                    (car active)))
6929          first nlast unread)
6930     ;; If none are read, then all are unread.
6931     (if (not read)
6932         (setq first bottom)
6933       ;; If the range of read articles is a single range, then the
6934       ;; first unread article is the article after the last read
6935       ;; article.  Sounds logical, doesn't it?
6936       (if (and (not (listp (cdr read)))
6937                (or (< (car read) bottom)
6938                    (progn (setq read (list read))
6939                           nil)))
6940           (setq first (max bottom (1+ (cdr read))))
6941         ;; `read' is a list of ranges.
6942         (when (/= (setq nlast (or (and (numberp (car read)) (car read))
6943                                   (caar read)))
6944                   1)
6945           (setq first bottom))
6946         (while read
6947           (when first
6948             (push (cons first nlast) unread))
6949           (setq first (1+ (if (atom (car read)) (car read) (cdar read))))
6950           (setq nlast (if (atom (cadr read)) (cadr read) (caadr read)))
6951           (setq read (cdr read)))))
6952     ;; And add the last unread articles.
6953     (cond ((not (and first last))
6954            nil)
6955           ((< first last)
6956            (push (cons first last) unread))
6957           ((= first last)
6958            (push first unread)))
6959     ;; Return the sequence of unread articles.
6960     (delq 0 (nreverse unread))))
6961
6962 ;; Various summary commands
6963
6964 (defun gnus-summary-select-article-buffer ()
6965   "Reconfigure windows to show the article buffer.
6966 If `gnus-widen-article-buffer' is set, show only the article
6967 buffer."
6968   (interactive)
6969   (if (not (gnus-buffer-live-p gnus-article-buffer))
6970       (error "There is no article buffer for this summary buffer")
6971     (unless (get-buffer-window gnus-article-buffer)
6972       (gnus-summary-show-article))
6973     (gnus-configure-windows
6974      (if gnus-widen-article-window
6975          'only-article
6976        'article)
6977      t)
6978     (select-window (get-buffer-window gnus-article-buffer))))
6979
6980 (defun gnus-summary-universal-argument (arg)
6981   "Perform any operation on all articles that are process/prefixed."
6982   (interactive "P")
6983   (let ((articles (gnus-summary-work-articles arg))
6984         func article)
6985     (if (eq
6986          (setq
6987           func
6988           (key-binding
6989            (read-key-sequence
6990             (substitute-command-keys
6991              "\\<gnus-summary-mode-map>\\[gnus-summary-universal-argument]"))))
6992          'undefined)
6993         (gnus-error 1 "Undefined key")
6994       (save-excursion
6995         (while articles
6996           (gnus-summary-goto-subject (setq article (pop articles)))
6997           (let (gnus-newsgroup-processable)
6998             (command-execute func))
6999           (gnus-summary-remove-process-mark article)))))
7000   (gnus-summary-position-point))
7001
7002 (defun gnus-summary-toggle-truncation (&optional arg)
7003   "Toggle truncation of summary lines.
7004 With ARG, turn line truncation on if ARG is positive."
7005   (interactive "P")
7006   (setq truncate-lines
7007         (if (null arg) (not truncate-lines)
7008           (> (prefix-numeric-value arg) 0)))
7009   (redraw-display))
7010
7011 (defun gnus-summary-find-for-reselect ()
7012   "Return the number of an article to stay on across a reselect.
7013 The current article is considered, then following articles, then previous
7014 articles.  An article is sought which is not cancelled and isn't a temporary
7015 insertion from another group.  If there's no such then return a dummy 0."
7016   (let (found)
7017     (dolist (rev '(nil t))
7018       (unless found      ; don't demand the reverse list if we don't need it
7019         (let ((data (gnus-data-find-list
7020                      (gnus-summary-article-number) (gnus-data-list rev))))
7021           (while (and data (not found))
7022             (if (and (< 0 (gnus-data-number (car data)))
7023                      (not (eq gnus-canceled-mark (gnus-data-mark (car data)))))
7024                 (setq found (gnus-data-number (car data))))
7025             (setq data (cdr data))))))
7026     (or found 0)))
7027
7028 (defun gnus-summary-reselect-current-group (&optional all rescan)
7029   "Exit and then reselect the current newsgroup.
7030 The prefix argument ALL means to select all articles."
7031   (interactive "P")
7032   (when (gnus-ephemeral-group-p gnus-newsgroup-name)
7033     (error "Ephemeral groups can't be reselected"))
7034   (let ((current-subject (gnus-summary-find-for-reselect))
7035         (group gnus-newsgroup-name))
7036     (setq gnus-newsgroup-begin nil)
7037     (gnus-summary-exit nil 'leave-hidden)
7038     ;; We have to adjust the point of group mode buffer because
7039     ;; point was moved to the next unread newsgroup by exiting.
7040     (gnus-summary-jump-to-group group)
7041     (when rescan
7042       (save-excursion
7043         (gnus-group-get-new-news-this-group 1)))
7044     (gnus-group-read-group all t)
7045     (gnus-summary-goto-subject current-subject nil t)))
7046
7047 (defun gnus-summary-rescan-group (&optional all)
7048   "Exit the newsgroup, ask for new articles, and select the newsgroup."
7049   (interactive "P")
7050   (let ((config gnus-current-window-configuration))
7051     (gnus-summary-reselect-current-group all t)
7052     (gnus-configure-windows config)
7053     (when (eq config 'article)
7054       (gnus-summary-select-article))))
7055
7056 (defun gnus-summary-update-info (&optional non-destructive)
7057   (save-excursion
7058     (let ((group gnus-newsgroup-name))
7059       (when group
7060         (when gnus-newsgroup-kill-headers
7061           (setq gnus-newsgroup-killed
7062                 (gnus-compress-sequence
7063                  (gnus-sorted-union
7064                   (gnus-list-range-intersection
7065                    gnus-newsgroup-unselected gnus-newsgroup-killed)
7066                   gnus-newsgroup-unreads)
7067                  t)))
7068         (unless (listp (cdr gnus-newsgroup-killed))
7069           (setq gnus-newsgroup-killed (list gnus-newsgroup-killed)))
7070         (let ((headers gnus-newsgroup-headers))
7071           ;; Set the new ranges of read articles.
7072           (with-current-buffer gnus-group-buffer
7073             (gnus-undo-force-boundary))
7074           (gnus-update-read-articles
7075            group (gnus-sorted-union
7076                   gnus-newsgroup-unreads gnus-newsgroup-unselected))
7077           ;; Set the current article marks.
7078           (let ((gnus-newsgroup-scored
7079                  (if (and (not gnus-save-score)
7080                           (not non-destructive))
7081                      nil
7082                    gnus-newsgroup-scored)))
7083             (save-excursion
7084               (gnus-update-marks)))
7085           ;; Do the cross-ref thing.
7086           (when gnus-use-cross-reference
7087             (gnus-mark-xrefs-as-read group headers gnus-newsgroup-unreads))
7088           ;; Do not switch windows but change the buffer to work.
7089           (set-buffer gnus-group-buffer)
7090           (unless (gnus-ephemeral-group-p group)
7091             (gnus-group-update-group group)))))))
7092
7093 (defun gnus-summary-save-newsrc (&optional force)
7094   "Save the current number of read/marked articles in the dribble buffer.
7095 The dribble buffer will then be saved.
7096 If FORCE (the prefix), also save the .newsrc file(s)."
7097   (interactive "P")
7098   (gnus-summary-update-info t)
7099   (if force
7100       (gnus-save-newsrc-file)
7101     (gnus-dribble-save)))
7102
7103 (declare-function gnus-cache-write-active "gnus-cache" (&optional force))
7104
7105 (defun gnus-summary-exit (&optional temporary leave-hidden)
7106   "Exit reading current newsgroup, and then return to group selection mode.
7107 `gnus-exit-group-hook' is called with no arguments if that value is non-nil."
7108   (interactive)
7109   (gnus-set-global-variables)
7110   (when (gnus-buffer-live-p gnus-article-buffer)
7111     (with-current-buffer gnus-article-buffer
7112       (mm-destroy-parts gnus-article-mime-handles)
7113       ;; Set it to nil for safety reason.
7114       (setq gnus-article-mime-handle-alist nil)
7115       (setq gnus-article-mime-handles nil)))
7116   (gnus-kill-save-kill-buffer)
7117   (gnus-async-halt-prefetch)
7118   (let* ((group gnus-newsgroup-name)
7119          (quit-config (gnus-group-quit-config gnus-newsgroup-name))
7120          (gnus-group-is-exiting-p t)
7121          (mode major-mode)
7122          (group-point nil)
7123          (buf (current-buffer)))
7124     (unless quit-config
7125       ;; Do adaptive scoring, and possibly save score files.
7126       (when gnus-newsgroup-adaptive
7127         (gnus-score-adaptive))
7128       (when gnus-use-scoring
7129         (gnus-score-save)))
7130     (gnus-run-hooks 'gnus-summary-prepare-exit-hook)
7131     (when gnus-use-cache
7132       (gnus-cache-possibly-remove-articles)
7133       (gnus-cache-save-buffers))
7134     (gnus-async-prefetch-remove-group group)
7135     (when gnus-suppress-duplicates
7136       (gnus-dup-enter-articles))
7137     (when gnus-use-trees
7138       (gnus-tree-close group))
7139     (when gnus-use-cache
7140       (gnus-cache-write-active))
7141     ;; Remove entries for this group.
7142     (nnmail-purge-split-history (gnus-group-real-name group))
7143     ;; Make all changes in this group permanent.
7144     (unless quit-config
7145       (gnus-run-hooks 'gnus-exit-group-hook)
7146       (gnus-summary-update-info))
7147     (gnus-close-group group)
7148     ;; Make sure where we were, and go to next newsgroup.
7149     (set-buffer gnus-group-buffer)
7150     (unless quit-config
7151       (gnus-group-jump-to-group group))
7152     (gnus-run-hooks 'gnus-summary-exit-hook)
7153     (unless (or quit-config
7154                 (not gnus-summary-next-group-on-exit)
7155                 ;; If this group has disappeared from the summary
7156                 ;; buffer, don't skip forwards.
7157                 (not (string= group (gnus-group-group-name))))
7158       (gnus-group-next-unread-group 1))
7159     (setq group-point (point))
7160     (if temporary
7161         nil                             ;Nothing to do.
7162       (set-buffer buf)
7163       (if (not gnus-kill-summary-on-exit)
7164           (progn
7165             (gnus-deaden-summary)
7166             (setq mode nil))
7167         (when (get-buffer gnus-article-buffer)
7168           (bury-buffer gnus-article-buffer))
7169         ;; Return to group mode buffer.
7170         (when (eq mode 'gnus-summary-mode)
7171           (gnus-kill-buffer buf)))
7172
7173       ;; If we have several article buffers, we kill them at exit.
7174       (unless gnus-single-article-buffer
7175         (when (gnus-buffer-live-p gnus-article-buffer)
7176           (with-current-buffer gnus-article-buffer
7177             ;; Don't kill sticky article buffers
7178             (unless (eq major-mode 'gnus-sticky-article-mode)
7179               (gnus-kill-buffer gnus-article-buffer)
7180               (setq gnus-article-current nil))))
7181         (gnus-kill-buffer gnus-original-article-buffer))
7182
7183       (setq gnus-current-select-method gnus-select-method)
7184       (set-buffer gnus-group-buffer)
7185       (if quit-config
7186           (gnus-handle-ephemeral-exit quit-config)
7187         (goto-char group-point)
7188         ;; If gnus-group-buffer is already displayed, make sure we also move
7189         ;; the cursor in the window that displays it.
7190         (let ((win (get-buffer-window (current-buffer) 0)))
7191           (if win (set-window-point win (point))))
7192         (unless leave-hidden
7193           (gnus-configure-windows 'group 'force)))
7194       ;; Clear the current group name.
7195       (unless quit-config
7196         (setq gnus-newsgroup-name nil)))))
7197
7198 (defalias 'gnus-summary-quit 'gnus-summary-exit-no-update)
7199 (defun gnus-summary-exit-no-update (&optional no-questions)
7200   "Quit reading current newsgroup without updating read article info."
7201   (interactive)
7202   (let* ((group gnus-newsgroup-name)
7203          (gnus-group-is-exiting-p t)
7204          (gnus-group-is-exiting-without-update-p t)
7205          (quit-config (gnus-group-quit-config group)))
7206     (when (or no-questions
7207               gnus-expert-user
7208               (gnus-y-or-n-p "Discard changes to this group and exit? "))
7209       (gnus-async-halt-prefetch)
7210       (run-hooks 'gnus-summary-prepare-exit-hook)
7211       (when (gnus-buffer-live-p gnus-article-buffer)
7212         (with-current-buffer gnus-article-buffer
7213           (mm-destroy-parts gnus-article-mime-handles)
7214           ;; Set it to nil for safety reason.
7215           (setq gnus-article-mime-handle-alist nil)
7216           (setq gnus-article-mime-handles nil)))
7217       ;; If we have several article buffers, we kill them at exit.
7218       (unless gnus-single-article-buffer
7219         (gnus-kill-buffer gnus-article-buffer)
7220         (gnus-kill-buffer gnus-original-article-buffer)
7221         (setq gnus-article-current nil))
7222       (if (not gnus-kill-summary-on-exit)
7223           (gnus-deaden-summary)
7224         (gnus-close-group group)
7225         (gnus-kill-buffer gnus-summary-buffer))
7226       (unless gnus-single-article-buffer
7227         (setq gnus-article-current nil))
7228       (when gnus-use-trees
7229         (gnus-tree-close group))
7230       (gnus-async-prefetch-remove-group group)
7231       (when (get-buffer gnus-article-buffer)
7232         (bury-buffer gnus-article-buffer))
7233       ;; Return to the group buffer.
7234       (gnus-configure-windows 'group 'force)
7235       ;; Clear the current group name.
7236       (setq gnus-newsgroup-name nil)
7237       (unless (gnus-ephemeral-group-p group)
7238         (gnus-group-update-group group))
7239       (when (equal (gnus-group-group-name) group)
7240         (gnus-group-next-unread-group 1))
7241       (when quit-config
7242         (gnus-handle-ephemeral-exit quit-config)))))
7243
7244 (defun gnus-handle-ephemeral-exit (quit-config)
7245   "Handle movement when leaving an ephemeral group.
7246 The state which existed when entering the ephemeral is reset."
7247   (if (not (buffer-name (car quit-config)))
7248       (gnus-configure-windows 'group 'force)
7249     (set-buffer (car quit-config))
7250     (cond ((eq major-mode 'gnus-summary-mode)
7251            (gnus-set-global-variables))
7252           ((eq major-mode 'gnus-article-mode)
7253            (save-current-buffer
7254              ;; The `gnus-summary-buffer' variable may point
7255              ;; to the old summary buffer when using a single
7256              ;; article buffer.
7257              (unless (gnus-buffer-live-p gnus-summary-buffer)
7258                (set-buffer gnus-group-buffer))
7259              (set-buffer gnus-summary-buffer)
7260              (gnus-set-global-variables))))
7261     (if (or (eq (cdr quit-config) 'article)
7262             (eq (cdr quit-config) 'pick))
7263         (if (and (boundp 'gnus-pick-mode) (symbol-value 'gnus-pick-mode))
7264             (gnus-configure-windows 'pick 'force)
7265           (gnus-configure-windows (cdr quit-config) 'force))
7266       (gnus-configure-windows (cdr quit-config) 'force))
7267     (when (eq major-mode 'gnus-summary-mode)
7268       (if (memq gnus-auto-select-on-ephemeral-exit '(next-noselect
7269                                                      next-unread-noselect))
7270           (when (zerop (cond ((eq gnus-auto-select-on-ephemeral-exit
7271                                   'next-noselect)
7272                               (gnus-summary-next-subject 1 nil t))
7273                              ((eq gnus-auto-select-on-ephemeral-exit
7274                                   'next-unread-noselect)
7275                               (gnus-summary-next-subject 1 t t))))
7276             ;; Hide the article buffer which displays the article different
7277             ;; from the one that the cursor points to in the summary buffer.
7278             (gnus-configure-windows 'summary 'force))
7279         (cond ((eq gnus-auto-select-on-ephemeral-exit 'next)
7280                (gnus-summary-next-subject 1))
7281               ((eq gnus-auto-select-on-ephemeral-exit 'next-unread)
7282                (gnus-summary-next-subject 1 t))))
7283       (gnus-summary-recenter)
7284       (gnus-summary-position-point))))
7285
7286 ;;; Dead summaries.
7287
7288 (defvar gnus-dead-summary-mode-map
7289   (let ((map (make-keymap)))
7290     (suppress-keymap map)
7291     (substitute-key-definition 'undefined 'gnus-summary-wake-up-the-dead map)
7292     (dolist (key '("\C-d" "\r" "\177" [delete]))
7293       (define-key map key 'gnus-summary-wake-up-the-dead))
7294     (dolist (key '("q" "Q"))
7295       (define-key map key 'bury-buffer))
7296     map))
7297
7298 (define-minor-mode gnus-dead-summary-mode
7299   "Minor mode for Gnus summary buffers."
7300   :lighter " Dead" :keymap gnus-dead-summary-mode-map
7301   (unless (derived-mode-p 'gnus-summary-mode)
7302     (setq gnus-dead-summary-mode nil)))
7303
7304 (defun gnus-deaden-summary ()
7305   "Make the current summary buffer into a dead summary buffer."
7306   ;; Kill any previous dead summary buffer.
7307   (when (and gnus-dead-summary
7308              (buffer-name gnus-dead-summary))
7309     (with-current-buffer gnus-dead-summary
7310       (when gnus-dead-summary-mode
7311         (kill-buffer (current-buffer)))))
7312   ;; Make this the current dead summary.
7313   (setq gnus-dead-summary (current-buffer))
7314   (gnus-dead-summary-mode 1)
7315   (let ((name (buffer-name)))
7316     (when (string-match "Summary" name)
7317       (rename-buffer
7318        (concat (substring name 0 (match-beginning 0)) "Dead "
7319                (substring name (match-beginning 0)))
7320        t)
7321       (bury-buffer))))
7322
7323 (defun gnus-kill-or-deaden-summary (buffer)
7324   "Kill or deaden the summary BUFFER."
7325   (save-excursion
7326     (when (and (buffer-name buffer)
7327                (not gnus-single-article-buffer))
7328       (with-current-buffer buffer
7329         (gnus-kill-buffer gnus-article-buffer)
7330         (gnus-kill-buffer gnus-original-article-buffer)))
7331     (cond
7332      ;; Kill the buffer.
7333      (gnus-kill-summary-on-exit
7334       (when (and gnus-use-trees
7335                  (gnus-buffer-exists-p buffer))
7336         (with-current-buffer buffer
7337           (gnus-tree-close gnus-newsgroup-name)))
7338       (gnus-kill-buffer buffer))
7339      ;; Deaden the buffer.
7340      ((gnus-buffer-exists-p buffer)
7341       (with-current-buffer buffer
7342         (gnus-deaden-summary))))))
7343
7344 (defun gnus-summary-wake-up-the-dead (&rest args)
7345   "Wake up the dead summary buffer."
7346   (interactive)
7347   (gnus-dead-summary-mode -1)
7348   (let ((name (buffer-name)))
7349     (when (string-match "Dead " name)
7350       (rename-buffer
7351        (concat (substring name 0 (match-beginning 0))
7352                (substring name (match-end 0)))
7353        t)))
7354   (gnus-message 3 "This dead summary is now alive again"))
7355
7356 ;; Suggested by Per Abrahamsen <amanda@iesd.auc.dk>.
7357 (defun gnus-summary-describe-group (&optional force)
7358   "Describe the current newsgroup."
7359   (interactive "P")
7360   (gnus-group-describe-group force gnus-newsgroup-name))
7361
7362 (defun gnus-summary-describe-briefly ()
7363   "Describe summary mode commands briefly."
7364   (interactive)
7365   (gnus-message 6 "%s" (substitute-command-keys "\\<gnus-summary-mode-map>\\[gnus-summary-next-page]:Select  \\[gnus-summary-next-unread-article]:Forward  \\[gnus-summary-prev-unread-article]:Backward  \\[gnus-summary-exit]:Exit  \\[gnus-info-find-node]:Run Info   \\[gnus-summary-describe-briefly]:This help")))
7366
7367 ;; Walking around group mode buffer from summary mode.
7368
7369 (defun gnus-summary-next-group (&optional no-article target-group backward)
7370   "Exit current newsgroup and then select next unread newsgroup.
7371 If prefix argument NO-ARTICLE is non-nil, no article is selected
7372 initially.  If TARGET-GROUP, go to this group.  If BACKWARD, go to
7373 previous group instead."
7374   (interactive "P")
7375   ;; Stop pre-fetching.
7376   (gnus-async-halt-prefetch)
7377   (let ((current-group gnus-newsgroup-name)
7378         (current-buffer (current-buffer))
7379         entered)
7380     ;; First we semi-exit this group to update Xrefs and all variables.
7381     ;; We can't do a real exit, because the window conf must remain
7382     ;; the same in case the user is prompted for info, and we don't
7383     ;; want the window conf to change before that...
7384     (gnus-summary-exit t)
7385     (while (not entered)
7386       ;; Then we find what group we are supposed to enter.
7387       (set-buffer gnus-group-buffer)
7388       (gnus-group-jump-to-group current-group)
7389       (setq target-group
7390             (or target-group
7391                 (if (eq gnus-keep-same-level 'best)
7392                     (gnus-summary-best-group gnus-newsgroup-name)
7393                   (gnus-summary-search-group backward gnus-keep-same-level))))
7394       (if (not target-group)
7395           ;; There are no further groups, so we return to the group
7396           ;; buffer.
7397           (progn
7398             (gnus-message 5 "Returning to the group buffer")
7399             (setq entered t)
7400             (when (gnus-buffer-live-p current-buffer)
7401               (set-buffer current-buffer)
7402               (gnus-summary-exit))
7403             (gnus-run-hooks 'gnus-group-no-more-groups-hook))
7404         ;; We try to enter the target group.
7405         (gnus-group-jump-to-group target-group)
7406         (let ((unreads (gnus-group-group-unread)))
7407           (if (and (or (eq t unreads)
7408                        (and unreads (not (zerop unreads))))
7409                    (gnus-summary-read-group
7410                     target-group nil no-article
7411                     (and (buffer-name current-buffer) current-buffer)
7412                     nil backward))
7413               (setq entered t)
7414             (setq current-group target-group
7415                   target-group nil)))))))
7416
7417 (defun gnus-summary-prev-group (&optional no-article)
7418   "Exit current newsgroup and then select previous unread newsgroup.
7419 If prefix argument NO-ARTICLE is non-nil, no article is selected initially."
7420   (interactive "P")
7421   (gnus-summary-next-group no-article nil t))
7422
7423 ;; Walking around summary lines.
7424
7425 (defun gnus-summary-first-subject (&optional unread undownloaded unseen)
7426   "Go to the first subject satisfying any non-nil constraint.
7427 If UNREAD is non-nil, the article should be unread.
7428 If UNDOWNLOADED is non-nil, the article should be undownloaded.
7429 If UNSEEN is non-nil, the article should be unseen as well as unread.
7430 Returns the article selected or nil if there are no matching articles."
7431   (interactive "P")
7432   (cond
7433    ;; Empty summary.
7434    ((null gnus-newsgroup-data)
7435     (gnus-message 3 "No articles in the group")
7436     nil)
7437    ;; Pick the first article.
7438    ((not (or unread undownloaded unseen))
7439     (goto-char (gnus-data-pos (car gnus-newsgroup-data)))
7440     (gnus-data-number (car gnus-newsgroup-data)))
7441    ;; Find the first unread article.
7442    (t
7443     (let ((data gnus-newsgroup-data))
7444       (while (and data
7445                   (let ((num (gnus-data-number (car data))))
7446                     (or (memq num gnus-newsgroup-unfetched)
7447                         (not (or (and unread
7448                                       (memq num gnus-newsgroup-unreads))
7449                                  (and undownloaded
7450                                       (memq num gnus-newsgroup-undownloaded))
7451                                  (and unseen
7452                                       (memq num gnus-newsgroup-unseen)
7453                                       (memq num gnus-newsgroup-unreads)))))))
7454         (setq data (cdr data)))
7455       (prog1
7456           (if data
7457               (progn
7458                 (goto-char (gnus-data-pos (car data)))
7459                 (gnus-data-number (car data)))
7460             (gnus-message 3 "No more%s articles"
7461                           (let* ((r (when unread " unread"))
7462                                  (d (when undownloaded " undownloaded"))
7463                                  (s (when unseen " unseen"))
7464                                  (l (delq nil (list r d s))))
7465                             (cond ((= 3 (length l))
7466                                    (concat r "," d ", or" s))
7467                                   ((= 2 (length l))
7468                                    (concat (car l) ", or" (cadr l)))
7469                                   ((= 1 (length l))
7470                                    (car l))
7471                                   (t
7472                                    ""))))
7473             nil
7474             )
7475         (gnus-summary-position-point))))))
7476
7477 (defun gnus-summary-next-subject (n &optional unread dont-display)
7478   "Go to next N'th summary line.
7479 If N is negative, go to the previous N'th subject line.
7480 If UNREAD is non-nil, only unread articles are selected.
7481 The difference between N and the actual number of steps taken is
7482 returned."
7483   (interactive "p")
7484   (let ((backward (< n 0))
7485         (n (abs n)))
7486     (while (and (> n 0)
7487                 (if backward
7488                     (gnus-summary-find-prev unread)
7489                   (gnus-summary-find-next unread)))
7490       (unless (zerop (setq n (1- n)))
7491         (gnus-summary-show-thread)))
7492     (when (/= 0 n)
7493       (gnus-message 7 "No more%s articles"
7494                     (if unread " unread" "")))
7495     (unless dont-display
7496       (gnus-summary-recenter)
7497       (gnus-summary-position-point))
7498     n))
7499
7500 (defun gnus-summary-next-unread-subject (n)
7501   "Go to next N'th unread summary line."
7502   (interactive "p")
7503   (gnus-summary-next-subject n t))
7504
7505 (defun gnus-summary-prev-subject (n &optional unread)
7506   "Go to previous N'th summary line.
7507 If optional argument UNREAD is non-nil, only unread article is selected."
7508   (interactive "p")
7509   (gnus-summary-next-subject (- n) unread))
7510
7511 (defun gnus-summary-prev-unread-subject (n)
7512   "Go to previous N'th unread summary line."
7513   (interactive "p")
7514   (gnus-summary-next-subject (- n) t))
7515
7516 (defun gnus-summary-goto-subjects (articles)
7517   "Insert the subject header for ARTICLES in the current buffer."
7518   (save-excursion
7519     (dolist (article articles)
7520       (gnus-summary-goto-subject article t)))
7521   (gnus-summary-limit (append articles gnus-newsgroup-limit))
7522   (gnus-summary-position-point))
7523
7524 (defun gnus-summary-goto-subject (article &optional force silent)
7525   "Go to the subject line of ARTICLE.
7526 If FORCE, also allow jumping to articles not currently shown."
7527   (interactive "nArticle number: ")
7528   (unless (numberp article)
7529     (error "Article %s is not a number" article))
7530   (let ((b (point))
7531         (data (gnus-data-find article)))
7532     ;; We read in the article if we have to.
7533     (and (not data)
7534          force
7535          (gnus-summary-insert-subject
7536           article
7537           (if (or (numberp force) (vectorp force)) force)
7538           t)
7539          (setq data (gnus-data-find article)))
7540     (goto-char b)
7541     (if (not data)
7542         (progn
7543           (unless silent
7544             (gnus-message 3 "Can't find article %d" article))
7545           nil)
7546       (let ((pt (gnus-data-pos data)))
7547         (goto-char pt)
7548         (gnus-summary-set-article-display-arrow pt))
7549       (gnus-summary-position-point)
7550       article)))
7551
7552 ;; Walking around summary lines with displaying articles.
7553
7554 (defun gnus-summary-expand-window (&optional arg)
7555   "Make the summary buffer take up the entire Emacs frame.
7556 Given a prefix, will force an `article' buffer configuration."
7557   (interactive "P")
7558   (if arg
7559       (gnus-configure-windows 'article 'force)
7560     (gnus-configure-windows 'summary 'force)))
7561
7562 (defun gnus-summary-display-article (article &optional all-header)
7563   "Display ARTICLE in article buffer."
7564   (unless (and (gnus-buffer-live-p gnus-article-buffer)
7565                (with-current-buffer gnus-article-buffer
7566                  (eq major-mode 'gnus-article-mode)))
7567     (gnus-article-setup-buffer))
7568   (gnus-set-global-variables)
7569   (with-current-buffer gnus-article-buffer
7570     (setq gnus-article-charset gnus-newsgroup-charset)
7571     (setq gnus-article-ignored-charsets gnus-newsgroup-ignored-charsets)
7572     (mm-enable-multibyte))
7573   (if (null article)
7574       nil
7575     (prog1
7576         (if gnus-summary-display-article-function
7577             (funcall gnus-summary-display-article-function article all-header)
7578           (gnus-article-prepare article all-header))
7579       (gnus-run-hooks 'gnus-select-article-hook)
7580       (when (and gnus-current-article
7581                  (not (zerop gnus-current-article)))
7582         (gnus-summary-goto-subject gnus-current-article))
7583       (gnus-summary-recenter)
7584       (when (and gnus-use-trees gnus-show-threads)
7585         (gnus-possibly-generate-tree article)
7586         (gnus-highlight-selected-tree article))
7587       ;; Successfully display article.
7588       (gnus-article-set-window-start
7589        (cdr (assq article gnus-newsgroup-bookmarks))))))
7590
7591 (defun gnus-summary-select-article (&optional all-headers force pseudo article)
7592   "Select the current article.
7593 If ALL-HEADERS is non-nil, show all header fields.  If FORCE is
7594 non-nil, the article will be re-fetched even if it already present in
7595 the article buffer.  If PSEUDO is non-nil, pseudo-articles will also
7596 be displayed."
7597   ;; Make sure we are in the summary buffer to work around bbdb bug.
7598   (unless (eq major-mode 'gnus-summary-mode)
7599     (set-buffer gnus-summary-buffer))
7600   (let ((article (or article (gnus-summary-article-number)))
7601         (all-headers (not (not all-headers))) ;Must be t or nil.
7602         gnus-summary-display-article-function)
7603     (and (not pseudo)
7604          (gnus-summary-article-pseudo-p article)
7605          (error "This is a pseudo-article"))
7606     (with-current-buffer gnus-summary-buffer
7607       (if (or (and gnus-single-article-buffer
7608                    (or (null gnus-current-article)
7609                        (null gnus-article-current)
7610                        (null (get-buffer gnus-article-buffer))
7611                        (not (eq article (cdr gnus-article-current)))
7612                        (not (equal (car gnus-article-current)
7613                                    gnus-newsgroup-name))
7614                        (not (get-buffer gnus-original-article-buffer))))
7615               (and (not gnus-single-article-buffer)
7616                    (or (null gnus-current-article)
7617                        (not (get-buffer gnus-original-article-buffer))
7618                        (not (eq gnus-current-article article))))
7619               force)
7620           ;; The requested article is different from the current article.
7621           (progn
7622             (gnus-summary-display-article article all-headers)
7623             (when (gnus-buffer-live-p gnus-article-buffer)
7624               (with-current-buffer gnus-article-buffer
7625                 (if (not gnus-article-decoded-p) ;; a local variable
7626                     (mm-disable-multibyte))))
7627             (gnus-article-set-window-start
7628              (cdr (assq article gnus-newsgroup-bookmarks)))
7629             article)
7630         'old))))
7631
7632 (defun gnus-summary-force-verify-and-decrypt ()
7633   "Display buttons for signed/encrypted parts and verify/decrypt them."
7634   (interactive)
7635   (let ((mm-verify-option 'known)
7636         (mm-decrypt-option 'known)
7637         (gnus-article-emulate-mime t)
7638         (gnus-buttonized-mime-types (append (list "multipart/signed"
7639                                                   "multipart/encrypted")
7640                                             gnus-buttonized-mime-types)))
7641     (gnus-summary-select-article nil 'force)))
7642
7643 (defun gnus-summary-set-current-mark (&optional current-mark)
7644   "Obsolete function."
7645   nil)
7646
7647 (defun gnus-summary-next-article (&optional unread subject backward push)
7648   "Select the next article.
7649 If UNREAD, only unread articles are selected.
7650 If SUBJECT, only articles with SUBJECT are selected.
7651 If BACKWARD, the previous article is selected instead of the next."
7652   (interactive "P")
7653   ;; Make sure we are in the summary buffer.
7654   (unless (eq major-mode 'gnus-summary-mode)
7655     (set-buffer gnus-summary-buffer))
7656   (cond
7657    ;; Is there such an article?
7658    ((and (gnus-summary-search-forward unread subject backward)
7659          (or (gnus-summary-display-article (gnus-summary-article-number))
7660              (eq (gnus-summary-article-mark) gnus-canceled-mark)))
7661     (gnus-summary-position-point))
7662    ;; If not, we try the first unread, if that is wanted.
7663    ((and subject
7664          gnus-auto-select-same
7665          (gnus-summary-first-unread-article))
7666     (gnus-summary-position-point)
7667     (gnus-message 6 "Wrapped"))
7668    ;; Try to get next/previous article not displayed in this group.
7669    ((and gnus-auto-extend-newsgroup
7670          (not unread) (not subject))
7671     (gnus-summary-goto-article
7672      (if backward (1- gnus-newsgroup-begin) (1+ gnus-newsgroup-end))
7673      nil (count-lines (point-min) (point))))
7674    ;; Go to next/previous group.
7675    (t
7676     (unless (gnus-ephemeral-group-p gnus-newsgroup-name)
7677       (gnus-summary-jump-to-group gnus-newsgroup-name))
7678     (let ((cmd (if (featurep 'xemacs)
7679                    last-command-char
7680                  last-command-event))
7681           (point
7682            (with-current-buffer gnus-group-buffer
7683              (point)))
7684           (group
7685            (if (eq gnus-keep-same-level 'best)
7686                (gnus-summary-best-group gnus-newsgroup-name)
7687              (gnus-summary-search-group backward gnus-keep-same-level))))
7688       ;; Select next unread newsgroup automagically.
7689       (cond
7690        ((or (not gnus-auto-select-next)
7691             (not cmd))
7692         (gnus-message 7 "No more%s articles" (if unread " unread" "")))
7693        ((or (eq gnus-auto-select-next 'quietly)
7694             (and (eq gnus-auto-select-next 'slightly-quietly)
7695                  push)
7696             (and (eq gnus-auto-select-next 'almost-quietly)
7697                  (gnus-summary-last-article-p)))
7698         ;; Select quietly.
7699         (if (gnus-ephemeral-group-p gnus-newsgroup-name)
7700             (gnus-summary-exit)
7701           (gnus-message 7 "No more%s articles (%s)..."
7702                         (if unread " unread" "")
7703                         (if group (concat "selecting " group)
7704                           "exiting"))
7705           (gnus-summary-next-group nil group backward)))
7706        (t
7707         (when (gnus-key-press-event-p last-input-event)
7708           (gnus-summary-walk-group-buffer
7709            gnus-newsgroup-name cmd unread backward point))))))))
7710
7711 (defun gnus-summary-walk-group-buffer (from-group cmd unread backward start)
7712   (let ((keystrokes '((?\C-n (gnus-group-next-unread-group 1))
7713                       (?\C-p (gnus-group-prev-unread-group 1))))
7714         (cursor-in-echo-area t)
7715         keve key group ended prompt)
7716     (with-current-buffer gnus-group-buffer
7717       (goto-char start)
7718       (setq group
7719             (if (eq gnus-keep-same-level 'best)
7720                 (gnus-summary-best-group gnus-newsgroup-name)
7721               (gnus-summary-search-group backward gnus-keep-same-level))))
7722     (while (not ended)
7723       (setq prompt
7724             (format
7725              "No more%s articles%s " (if unread " unread" "")
7726              (if (and group
7727                       (not (gnus-ephemeral-group-p gnus-newsgroup-name)))
7728                  (format " (Type %s for %s [%s])"
7729                          (single-key-description cmd)
7730                          (gnus-group-decoded-name group)
7731                          (gnus-group-unread group))
7732                (format " (Type %s to exit %s)"
7733                        (single-key-description cmd)
7734                        (gnus-group-decoded-name gnus-newsgroup-name)))))
7735       ;; Confirm auto selection.
7736       (setq key (car (setq keve (gnus-read-event-char prompt)))
7737             ended t)
7738       (cond
7739        ((assq key keystrokes)
7740         (let ((obuf (current-buffer)))
7741           (switch-to-buffer gnus-group-buffer)
7742           (when group
7743             (gnus-group-jump-to-group group))
7744           (eval (cadr (assq key keystrokes)))
7745           (setq group (gnus-group-group-name))
7746           (switch-to-buffer obuf))
7747         (setq ended nil))
7748        ((equal key cmd)
7749         (if (or (not group)
7750                 (gnus-ephemeral-group-p gnus-newsgroup-name))
7751             (gnus-summary-exit)
7752           (gnus-summary-next-group nil group backward)))
7753        (t
7754         (push (cdr keve) unread-command-events))))))
7755
7756 (defun gnus-summary-next-unread-article ()
7757   "Select unread article after current one."
7758   (interactive)
7759   (gnus-summary-next-article
7760    (or (not (eq gnus-summary-goto-unread 'never))
7761        (gnus-summary-last-article-p (gnus-summary-article-number)))
7762    (and gnus-auto-select-same
7763         (gnus-summary-article-subject))))
7764
7765 (defun gnus-summary-prev-article (&optional unread subject)
7766   "Select the article before the current one.
7767 If UNREAD is non-nil, only unread articles are selected."
7768   (interactive "P")
7769   (gnus-summary-next-article unread subject t))
7770
7771 (defun gnus-summary-prev-unread-article ()
7772   "Select unread article before current one."
7773   (interactive)
7774   (gnus-summary-prev-article
7775    (or (not (eq gnus-summary-goto-unread 'never))
7776        (gnus-summary-first-article-p (gnus-summary-article-number)))
7777    (and gnus-auto-select-same
7778         (gnus-summary-article-subject))))
7779
7780 (defun gnus-summary-next-page (&optional lines circular stop)
7781   "Show next page of the selected article.
7782 If at the end of the current article, select the next article.
7783 LINES says how many lines should be scrolled up.
7784
7785 If CIRCULAR is non-nil, go to the start of the article instead of
7786 selecting the next article when reaching the end of the current
7787 article.
7788
7789 If STOP is non-nil, just stop when reaching the end of the message.
7790
7791 Also see the variable `gnus-article-skip-boring'."
7792   (interactive "P")
7793   (setq gnus-summary-buffer (current-buffer))
7794   (gnus-set-global-variables)
7795   (let ((article (gnus-summary-article-number))
7796         (article-window (get-buffer-window gnus-article-buffer t))
7797         endp)
7798     ;; If the buffer is empty, we have no article.
7799     (unless article
7800       (error "No article to select"))
7801     (gnus-configure-windows 'article)
7802     (if (eq (cdr (assq article gnus-newsgroup-reads)) gnus-canceled-mark)
7803         (if (and (eq gnus-summary-goto-unread 'never)
7804                  (not (gnus-summary-last-article-p article)))
7805             (gnus-summary-next-article)
7806           (gnus-summary-next-unread-article))
7807       (if (or (null gnus-current-article)
7808               (null gnus-article-current)
7809               (/= article (cdr gnus-article-current))
7810               (not (equal (car gnus-article-current) gnus-newsgroup-name)))
7811           ;; Selected subject is different from current article's.
7812           (gnus-summary-display-article article)
7813         (when article-window
7814           (gnus-eval-in-buffer-window gnus-article-buffer
7815             (setq endp (or (gnus-article-next-page lines)
7816                            (gnus-article-only-boring-p))))
7817           (when endp
7818             (cond ((or stop gnus-summary-stop-at-end-of-message)
7819                    (gnus-message 3 "End of message"))
7820                   (circular
7821                    (gnus-summary-beginning-of-article))
7822                   (lines
7823                    (gnus-message 3 "End of message"))
7824                   ((null lines)
7825                    (if (and (eq gnus-summary-goto-unread 'never)
7826                             (not (gnus-summary-last-article-p article)))
7827                        (gnus-summary-next-article)
7828                      (gnus-summary-next-unread-article))))))))
7829     (gnus-summary-recenter)
7830     (gnus-summary-position-point)))
7831
7832 (defun gnus-summary-prev-page (&optional lines move)
7833   "Show previous page of selected article.
7834 Argument LINES specifies lines to be scrolled down.
7835 If MOVE, move to the previous unread article if point is at
7836 the beginning of the buffer."
7837   (interactive "P")
7838   (let ((article (gnus-summary-article-number))
7839         (article-window (get-buffer-window gnus-article-buffer t))
7840         endp)
7841     (gnus-configure-windows 'article)
7842     (if (or (null gnus-current-article)
7843             (null gnus-article-current)
7844             (/= article (cdr gnus-article-current))
7845             (not (equal (car gnus-article-current) gnus-newsgroup-name)))
7846         ;; Selected subject is different from current article's.
7847         (gnus-summary-display-article article)
7848       (gnus-summary-recenter)
7849       (when article-window
7850         (gnus-eval-in-buffer-window gnus-article-buffer
7851           (setq endp (gnus-article-prev-page lines)))
7852         (when (and move endp)
7853           (cond (lines
7854                  (gnus-message 3 "Beginning of message"))
7855                 ((null lines)
7856                  (if (and (eq gnus-summary-goto-unread 'never)
7857                           (not (gnus-summary-first-article-p article)))
7858                      (gnus-summary-prev-article)
7859                    (gnus-summary-prev-unread-article))))))))
7860   (gnus-summary-position-point))
7861
7862 (defun gnus-summary-prev-page-or-article (&optional lines)
7863   "Show previous page of selected article.
7864 Argument LINES specifies lines to be scrolled down.
7865 If at the beginning of the article, go to the next article."
7866   (interactive "P")
7867   (gnus-summary-prev-page lines t))
7868
7869 (defun gnus-summary-scroll-up (lines)
7870   "Scroll up (or down) one line current article.
7871 Argument LINES specifies lines to be scrolled up (or down if negative).
7872 If no article is selected, then the current article will be selected first."
7873   (interactive "p")
7874   (gnus-configure-windows 'article)
7875   (gnus-summary-show-thread)
7876   (when (eq (gnus-summary-select-article nil nil 'pseudo) 'old)
7877     (gnus-eval-in-buffer-window gnus-article-buffer
7878       (cond ((> lines 0)
7879              (when (gnus-article-next-page lines)
7880                (gnus-message 3 "End of message")))
7881             ((< lines 0)
7882              (gnus-article-prev-page (- lines))))))
7883   (gnus-summary-recenter)
7884   (gnus-summary-position-point))
7885
7886 (defun gnus-summary-scroll-down (lines)
7887   "Scroll down (or up) one line current article.
7888 Argument LINES specifies lines to be scrolled down (or up if negative).
7889 If no article is selected, then the current article will be selected first."
7890   (interactive "p")
7891   (gnus-summary-scroll-up (- lines)))
7892
7893 (defun gnus-summary-next-same-subject ()
7894   "Select next article which has the same subject as current one."
7895   (interactive)
7896   (gnus-summary-next-article nil (gnus-summary-article-subject)))
7897
7898 (defun gnus-summary-prev-same-subject ()
7899   "Select previous article which has the same subject as current one."
7900   (interactive)
7901   (gnus-summary-prev-article nil (gnus-summary-article-subject)))
7902
7903 (defun gnus-summary-next-unread-same-subject ()
7904   "Select next unread article which has the same subject as current one."
7905   (interactive)
7906   (gnus-summary-next-article t (gnus-summary-article-subject)))
7907
7908 (defun gnus-summary-prev-unread-same-subject ()
7909   "Select previous unread article which has the same subject as current one."
7910   (interactive)
7911   (gnus-summary-prev-article t (gnus-summary-article-subject)))
7912
7913 (defun gnus-summary-first-unread-article ()
7914   "Select the first unread article.
7915 Return nil if there are no unread articles."
7916   (interactive)
7917   (prog1
7918       (when (gnus-summary-first-subject t)
7919         (gnus-summary-show-thread)
7920         (gnus-summary-first-subject t)
7921         (gnus-summary-display-article (gnus-summary-article-number)))
7922     (gnus-summary-position-point)))
7923
7924 (defun gnus-summary-first-unread-subject ()
7925   "Place the point on the subject line of the first unread article.
7926 Return nil if there are no unread articles."
7927   (interactive)
7928   (prog1
7929       (when (gnus-summary-first-subject t)
7930         (gnus-summary-show-thread)
7931         (gnus-summary-first-subject t))
7932     (gnus-summary-position-point)))
7933
7934 (defun gnus-summary-first-unseen-subject ()
7935   "Place the point on the subject line of the first unseen article.
7936 Return nil if there are no unseen articles."
7937   (interactive)
7938   (prog1
7939       (when (gnus-summary-first-subject nil nil t)
7940         (gnus-summary-show-thread)
7941         (gnus-summary-first-subject nil nil t))
7942     (gnus-summary-position-point)))
7943
7944 (defun gnus-summary-first-unseen-or-unread-subject ()
7945   "Place the point on the subject line of the first unseen and unread article.
7946 If all article have been seen, on the subject line of the first unread
7947 article."
7948   (interactive)
7949   (prog1
7950       (unless (when (gnus-summary-first-subject nil nil t)
7951                 (gnus-summary-show-thread)
7952                 (gnus-summary-first-subject nil nil t))
7953         (when (gnus-summary-first-subject t)
7954           (gnus-summary-show-thread)
7955           (gnus-summary-first-subject t)))
7956     (gnus-summary-position-point)))
7957
7958 (defun gnus-summary-first-article ()
7959   "Select the first article.
7960 Return nil if there are no articles."
7961   (interactive)
7962   (prog1
7963       (when (gnus-summary-first-subject)
7964         (gnus-summary-show-thread)
7965         (gnus-summary-first-subject)
7966         (gnus-summary-display-article (gnus-summary-article-number)))
7967     (gnus-summary-position-point)))
7968
7969 (defun gnus-summary-best-unread-article (&optional arg)
7970   "Select the unread article with the highest score.
7971 If given a prefix argument, select the next unread article that has a
7972 score higher than the default score."
7973   (interactive "P")
7974   (let ((article (if arg
7975                      (gnus-summary-better-unread-subject)
7976                    (gnus-summary-best-unread-subject))))
7977     (if article
7978         (gnus-summary-goto-article article)
7979       (error "No unread articles"))))
7980
7981 (defun gnus-summary-best-unread-subject ()
7982   "Select the unread subject with the highest score."
7983   (interactive)
7984   (let ((best -1000000)
7985         (data gnus-newsgroup-data)
7986         article score)
7987     (while data
7988       (and (gnus-data-unread-p (car data))
7989            (> (setq score
7990                     (gnus-summary-article-score (gnus-data-number (car data))))
7991               best)
7992            (setq best score
7993                  article (gnus-data-number (car data))))
7994       (setq data (cdr data)))
7995     (when article
7996       (gnus-summary-goto-subject article))
7997     (gnus-summary-position-point)
7998     article))
7999
8000 (defun gnus-summary-better-unread-subject ()
8001   "Select the first unread subject that has a score over the default score."
8002   (interactive)
8003   (let ((data gnus-newsgroup-data)
8004         article score)
8005     (while (and (setq article (gnus-data-number (car data)))
8006                 (or (gnus-data-read-p (car data))
8007                     (not (> (gnus-summary-article-score article)
8008                             gnus-summary-default-score))))
8009       (setq data (cdr data)))
8010     (when article
8011       (gnus-summary-goto-subject article))
8012     (gnus-summary-position-point)
8013     article))
8014
8015 (defun gnus-summary-last-subject ()
8016   "Go to the last displayed subject line in the group."
8017   (let ((article (gnus-data-number (car (gnus-data-list t)))))
8018     (when article
8019       (gnus-summary-goto-subject article))))
8020
8021 (defun gnus-summary-goto-article (article &optional all-headers force)
8022   "Fetch ARTICLE (article number or Message-ID) and display it if it exists.
8023 If ALL-HEADERS is non-nil, no header lines are hidden.
8024 If FORCE, go to the article even if it isn't displayed.  If FORCE
8025 is a number, it is the line the article is to be displayed on."
8026   (interactive
8027    (list
8028     (gnus-completing-read
8029      "Article number or Message-ID"
8030      (mapcar 'int-to-string gnus-newsgroup-limit))
8031     current-prefix-arg
8032     t))
8033   (prog1
8034       (if (and (stringp article)
8035                (string-match "@\\|%40" article))
8036           (gnus-summary-refer-article article)
8037         (when (stringp article)
8038           (setq article (string-to-number article)))
8039         (if (gnus-summary-goto-subject article force)
8040             (gnus-summary-display-article article all-headers)
8041           (gnus-message 4 "Couldn't go to article %s" article) nil))
8042     (gnus-summary-position-point)))
8043
8044 (defun gnus-summary-goto-last-article ()
8045   "Go to the previously read article."
8046   (interactive)
8047   (prog1
8048       (when gnus-last-article
8049         (gnus-summary-goto-article gnus-last-article nil t))
8050     (gnus-summary-position-point)))
8051
8052 (defun gnus-summary-pop-article (number)
8053   "Pop one article off the history and go to the previous.
8054 NUMBER articles will be popped off."
8055   (interactive "p")
8056   (let (to)
8057     (setq gnus-newsgroup-history
8058           (cdr (setq to (nthcdr number gnus-newsgroup-history))))
8059     (if to
8060         (gnus-summary-goto-article (car to) nil t)
8061       (error "Article history empty")))
8062   (gnus-summary-position-point))
8063
8064 ;; Summary commands and functions for limiting the summary buffer.
8065
8066 (defun gnus-summary-limit-to-articles (n)
8067   "Limit the summary buffer to the next N articles.
8068 If not given a prefix, use the process marked articles instead."
8069   (interactive "P")
8070   (prog1
8071       (let ((articles (gnus-summary-work-articles n)))
8072         (setq gnus-newsgroup-processable nil)
8073         (gnus-summary-limit articles))
8074     (gnus-summary-position-point)))
8075
8076 (defun gnus-summary-pop-limit (&optional total)
8077   "Restore the previous limit.
8078 If given a prefix, remove all limits."
8079   (interactive "P")
8080   (when total
8081     (setq gnus-newsgroup-limits
8082           (list (mapcar (lambda (h) (mail-header-number h))
8083                         gnus-newsgroup-headers))))
8084   (unless gnus-newsgroup-limits
8085     (error "No limit to pop"))
8086   (prog1
8087       (gnus-summary-limit nil 'pop)
8088     (gnus-summary-position-point)))
8089
8090 (defun gnus-summary-limit-to-subject (subject &optional header not-matching)
8091   "Limit the summary buffer to articles that have subjects that match a regexp.
8092 If NOT-MATCHING, excluding articles that have subjects that match a regexp."
8093   (interactive
8094    (list (read-string (if current-prefix-arg
8095                           "Exclude subject (regexp): "
8096                         "Limit to subject (regexp): "))
8097          nil current-prefix-arg))
8098   (unless header
8099     (setq header "subject"))
8100   (when (not (equal "" subject))
8101     (prog1
8102         (let ((articles (gnus-summary-find-matching
8103                          (or header "subject") subject 'all nil nil
8104                          not-matching)))
8105           (unless articles
8106             (error "Found no matches for \"%s\"" subject))
8107           (gnus-summary-limit articles))
8108       (gnus-summary-position-point))))
8109
8110 (defun gnus-summary-limit-to-author (from &optional not-matching)
8111   "Limit the summary buffer to articles that have authors that match a regexp.
8112 If NOT-MATCHING, excluding articles that have authors that match a regexp."
8113   (interactive
8114    (list (read-string (if current-prefix-arg
8115                           "Exclude author (regexp): "
8116                         "Limit to author (regexp): "))
8117          current-prefix-arg))
8118   (gnus-summary-limit-to-subject from "from" not-matching))
8119
8120 (defun gnus-summary-limit-to-recipient (recipient &optional not-matching)
8121   "Limit the summary buffer to articles with the given RECIPIENT.
8122
8123 If NOT-MATCHING, exclude RECIPIENT.
8124
8125 To and Cc headers are checked.  You need to include them in
8126 `nnmail-extra-headers'."
8127   ;; Unlike `rmail-summary-by-recipients', doesn't include From.
8128   (interactive
8129    (list (read-string (format "%s recipient (regexp): "
8130                               (if current-prefix-arg "Exclude" "Limit to")))
8131          current-prefix-arg))
8132   (when (not (equal "" recipient))
8133     (prog1 (let* ((to
8134                    (if (memq 'To nnmail-extra-headers)
8135                        (gnus-summary-find-matching
8136                         (cons 'extra 'To) recipient 'all nil nil
8137                         not-matching)
8138                      (gnus-message
8139                       1 "`To' isn't present in `nnmail-extra-headers'")
8140                      (sit-for 1)
8141                      nil))
8142                   (cc
8143                    (if (memq 'Cc nnmail-extra-headers)
8144                        (gnus-summary-find-matching
8145                         (cons 'extra 'Cc) recipient 'all nil nil
8146                         not-matching)
8147                      (gnus-message
8148                       1 "`Cc' isn't present in `nnmail-extra-headers'")
8149                      (sit-for 1)
8150                      nil))
8151                   (articles
8152                    (if not-matching
8153                        ;; We need the numbers that are in both lists:
8154                        (mapcar (lambda (a)
8155                                  (and (memq a to) a))
8156                                cc)
8157                      (nconc to cc))))
8158              (unless articles
8159                (error "Found no matches for \"%s\"" recipient))
8160              (gnus-summary-limit articles))
8161       (gnus-summary-position-point))))
8162
8163 (defun gnus-summary-limit-to-address (address &optional not-matching)
8164   "Limit the summary buffer to articles with the given ADDRESS.
8165
8166 If NOT-MATCHING, exclude ADDRESS.
8167
8168 To, Cc and From headers are checked.  You need to include `To' and `Cc'
8169 in `nnmail-extra-headers'."
8170   (interactive
8171    (list (read-string (format "%s address (regexp): "
8172                               (if current-prefix-arg "Exclude" "Limit to")))
8173          current-prefix-arg))
8174   (when (not (equal "" address))
8175     (prog1 (let* ((to
8176                    (if (memq 'To nnmail-extra-headers)
8177                        (gnus-summary-find-matching
8178                         (cons 'extra 'To) address 'all nil nil
8179                         not-matching)
8180                      (gnus-message
8181                       1 "`To' isn't present in `nnmail-extra-headers'")
8182                      (sit-for 1)
8183                      t))
8184                   (cc
8185                    (if (memq 'Cc nnmail-extra-headers)
8186                        (gnus-summary-find-matching
8187                         (cons 'extra 'Cc) address 'all nil nil
8188                         not-matching)
8189                      (gnus-message
8190                       1 "`Cc' isn't present in `nnmail-extra-headers'")
8191                      (sit-for 1)
8192                      t))
8193                   (from
8194                    (gnus-summary-find-matching "from" address
8195                                                'all nil nil not-matching))
8196                   (articles
8197                    (if not-matching
8198                        ;; We need the numbers that are in all lists:
8199                        (if (eq cc t)
8200                            (if (eq to t)
8201                                from
8202                              (mapcar (lambda (a) (car (memq a from))) to))
8203                          (if (eq to t)
8204                              (mapcar (lambda (a) (car (memq a from))) cc)
8205                            (mapcar (lambda (a) (car (memq a from)))
8206                                    (mapcar (lambda (a) (car (memq a to)))
8207                                            cc))))
8208                      (nconc (if (eq to t) nil to)
8209                             (if (eq cc t) nil cc)
8210                             from))))
8211              (unless articles
8212                (error "Found no matches for \"%s\"" address))
8213              (gnus-summary-limit articles))
8214       (gnus-summary-position-point))))
8215
8216 (defun gnus-summary-limit-strange-charsets-predicate (header)
8217   (when (fboundp 'char-charset)
8218     (let ((string (concat (mail-header-subject header)
8219                           (mail-header-from header)))
8220           charset found)
8221       (dotimes (i (1- (length string)))
8222         (setq charset (format "%s" (char-charset (aref string (1+ i)))))
8223         (when (string-match "unicode\\|big\\|japanese" charset)
8224           (setq found t)))
8225       found)))
8226
8227 (defun gnus-summary-limit-to-predicate (predicate)
8228   "Limit to articles where PREDICATE returns non-nil.
8229 PREDICATE will be called with the header structures of the
8230 articles."
8231   (let ((articles nil)
8232         (case-fold-search t))
8233     (dolist (header gnus-newsgroup-headers)
8234       (when (funcall predicate header)
8235         (push (mail-header-number header) articles)))
8236     (gnus-summary-limit (nreverse articles))))
8237
8238 (defun gnus-summary-limit-to-age (age &optional younger-p)
8239   "Limit the summary buffer to articles that are older than (or equal) AGE days.
8240 If YOUNGER-P (the prefix) is non-nil, limit the summary buffer to
8241 articles that are younger than AGE days."
8242   (interactive
8243    (let ((younger current-prefix-arg)
8244          (days-got nil)
8245          days)
8246      (while (not days-got)
8247        (setq days (if younger
8248                       (read-string "Limit to articles younger than (in days, older when negative): ")
8249                     (read-string
8250                      "Limit to articles older than (in days, younger when negative): ")))
8251        (when (> (length days) 0)
8252          (setq days (read days)))
8253        (if (numberp days)
8254            (progn
8255              (setq days-got t)
8256              (when (< days 0)
8257                (setq younger (not younger))
8258                (setq days (* days -1))))
8259          (message "Please enter a number.")
8260          (sleep-for 1)))
8261      (list days younger)))
8262   (prog1
8263       (let ((data gnus-newsgroup-data)
8264             (cutoff (days-to-time age))
8265             articles d date is-younger)
8266         (while (setq d (pop data))
8267           (when (and (vectorp (gnus-data-header d))
8268                      (setq date (mail-header-date (gnus-data-header d))))
8269             (setq is-younger (time-less-p
8270                               (time-since (gnus-date-get-time date))
8271                               cutoff))
8272             (when (if younger-p
8273                       is-younger
8274                     (not is-younger))
8275               (push (gnus-data-number d) articles))))
8276         (gnus-summary-limit (nreverse articles)))
8277     (gnus-summary-position-point)))
8278
8279 (defun gnus-summary-limit-to-extra (header regexp &optional not-matching)
8280   "Limit the summary buffer to articles that match an 'extra' header."
8281   (interactive
8282    (let ((header
8283           (intern
8284            (gnus-completing-read
8285             (if current-prefix-arg
8286                 "Exclude extra header"
8287               "Limit extra header")
8288             (mapcar 'symbol-name gnus-extra-headers)
8289             t nil nil
8290             (symbol-name (car gnus-extra-headers))))))
8291      (list header
8292            (read-string (format "%s header %s (regexp): "
8293                                 (if current-prefix-arg "Exclude" "Limit to")
8294                                 header))
8295            current-prefix-arg)))
8296   (when (not (equal "" regexp))
8297     (prog1
8298         (let ((articles (gnus-summary-find-matching
8299                          (cons 'extra header) regexp 'all nil nil
8300                          not-matching)))
8301           (unless articles
8302             (error "Found no matches for \"%s\"" regexp))
8303           (gnus-summary-limit articles))
8304       (gnus-summary-position-point))))
8305
8306 (defun gnus-summary-limit-to-display-predicate ()
8307   "Limit the summary buffer to the predicated in the `display' group parameter."
8308   (interactive)
8309   (unless gnus-newsgroup-display
8310     (error "There is no `display' group parameter"))
8311   (let (articles)
8312     (dolist (gnus-number gnus-newsgroup-articles)
8313       (when (funcall gnus-newsgroup-display)
8314         (push gnus-number articles)))
8315     (gnus-summary-limit articles))
8316   (gnus-summary-position-point))
8317
8318 (defun gnus-summary-limit-to-unread (&optional all)
8319   "Limit the summary buffer to articles that are not marked as read.
8320 If ALL is non-nil, limit strictly to unread articles."
8321   (interactive "P")
8322   (if all
8323       (gnus-summary-limit-to-marks (char-to-string gnus-unread-mark))
8324     (gnus-summary-limit-to-marks
8325      ;; Concat all the marks that say that an article is read and have
8326      ;; those removed.
8327      (list gnus-del-mark gnus-read-mark gnus-ancient-mark
8328            gnus-killed-mark gnus-spam-mark gnus-kill-file-mark
8329            gnus-low-score-mark gnus-expirable-mark
8330            gnus-canceled-mark gnus-catchup-mark gnus-sparse-mark
8331            gnus-duplicate-mark)
8332      'reverse)))
8333
8334 (defun gnus-summary-limit-to-headers (match &optional reverse)
8335   "Limit the summary buffer to articles that have headers that match MATCH.
8336 If REVERSE (the prefix), limit to articles that don't match."
8337   (interactive "sMatch headers (regexp): \nP")
8338   (gnus-summary-limit-to-bodies match reverse t))
8339
8340 (defun gnus-summary-limit-to-bodies (match &optional reverse headersp)
8341   "Limit the summary buffer to articles that have bodies that match MATCH.
8342 If REVERSE (the prefix), limit to articles that don't match."
8343   (interactive "sMatch body (regexp): \nP")
8344   (let ((articles nil)
8345         (gnus-select-article-hook nil)  ;Disable hook.
8346         (gnus-article-prepare-hook nil)
8347         (gnus-use-article-prefetch nil)
8348         (gnus-keep-backlog nil)
8349         (gnus-break-pages nil)
8350         (gnus-summary-display-arrow nil)
8351         (gnus-updated-mode-lines nil)
8352         (gnus-auto-center-summary nil)
8353         (gnus-display-mime-function nil))
8354     (dolist (data gnus-newsgroup-data)
8355       (let (gnus-mark-article-hook)
8356         (gnus-summary-select-article t t nil (gnus-data-number data)))
8357       (with-current-buffer gnus-article-buffer
8358         (article-goto-body)
8359         (let* ((case-fold-search t)
8360                (found (if headersp
8361                           (re-search-backward match nil t)
8362                         (re-search-forward match nil t))))
8363           (when (or (and found
8364                          (not reverse))
8365                     (and (not found)
8366                          reverse))
8367             (push (gnus-data-number data) 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-singletons (&optional threadsp)
8374   "Limit the summary buffer to articles that aren't part on any thread.
8375 If THREADSP (the prefix), limit to articles that are in threads."
8376   (interactive "P")
8377   (let ((articles nil)
8378         thread-articles
8379         threads)
8380     (dolist (thread gnus-newsgroup-threads)
8381       (if (stringp (car thread))
8382           (dolist (thread (cdr thread))
8383             (push thread threads))
8384         (push thread threads)))
8385     (dolist (thread threads)
8386       (setq thread-articles (gnus-articles-in-thread thread))
8387       (when (or (and threadsp
8388                      (> (length thread-articles) 1))
8389                 (and (not threadsp)
8390                      (= (length thread-articles) 1)))
8391         (setq articles (nconc thread-articles articles))))
8392     (if (not articles)
8393         (message "No messages matched")
8394       (gnus-summary-limit articles))
8395     (gnus-summary-position-point)))
8396
8397 (defun gnus-summary-limit-to-replied (&optional unreplied)
8398   "Limit the summary buffer to replied articles.
8399 If UNREPLIED (the prefix), limit to unreplied articles."
8400   (interactive "P")
8401   (if unreplied
8402       (gnus-summary-limit
8403        (gnus-set-difference gnus-newsgroup-articles
8404         gnus-newsgroup-replied))
8405     (gnus-summary-limit gnus-newsgroup-replied))
8406   (gnus-summary-position-point))
8407
8408 (defun gnus-summary-limit-exclude-marks (marks &optional reverse)
8409   "Exclude articles that are marked with MARKS (e.g. \"DK\").
8410 If REVERSE, limit the summary buffer to articles that are marked
8411 with MARKS.  MARKS can either be a string of marks or a list of marks.
8412 Returns how many articles were removed."
8413   (interactive "sMarks: ")
8414   (gnus-summary-limit-to-marks marks t))
8415
8416 (defun gnus-summary-limit-to-marks (marks &optional reverse)
8417   "Limit the summary buffer to articles that are marked with MARKS (e.g. \"DK\").
8418 If REVERSE (the prefix), limit the summary buffer to articles that are
8419 not marked with MARKS.  MARKS can either be a string of marks or a
8420 list of marks.
8421 Returns how many articles were removed."
8422   (interactive "sMarks: \nP")
8423   (prog1
8424       (let ((data gnus-newsgroup-data)
8425             (marks (if (listp marks) marks
8426                      (append marks nil))) ; Transform to list.
8427             articles)
8428         (while data
8429           (when (if reverse (not (memq (gnus-data-mark (car data)) marks))
8430                   (memq (gnus-data-mark (car data)) marks))
8431             (push (gnus-data-number (car data)) articles))
8432           (setq data (cdr data)))
8433         (gnus-summary-limit articles))
8434     (gnus-summary-position-point)))
8435
8436 (defun gnus-summary-limit-to-score (score)
8437   "Limit to articles with score at or above SCORE."
8438   (interactive "NLimit to articles with score of at least: ")
8439   (let ((data gnus-newsgroup-data)
8440         articles)
8441     (while data
8442       (when (>= (gnus-summary-article-score (gnus-data-number (car data)))
8443                 score)
8444         (push (gnus-data-number (car data)) articles))
8445       (setq data (cdr data)))
8446     (prog1
8447         (gnus-summary-limit articles)
8448       (gnus-summary-position-point))))
8449
8450 (defun gnus-summary-limit-to-unseen ()
8451   "Limit to unseen articles."
8452   (interactive)
8453   (prog1
8454       (gnus-summary-limit gnus-newsgroup-unseen)
8455     (gnus-summary-position-point)))
8456
8457 (defun gnus-summary-limit-include-thread (id)
8458   "Display all the hidden articles that is in the thread with ID in it.
8459 When called interactively, ID is the Message-ID of the current
8460 article."
8461   (interactive (list (mail-header-id (gnus-summary-article-header))))
8462   (let ((articles (gnus-articles-in-thread
8463                    (gnus-id-to-thread (gnus-root-id id))))
8464         ;;we REALLY want the whole thread---this prevents cut-threads
8465         ;;from removing the thread we want to include.
8466         (gnus-fetch-old-headers nil)
8467         (gnus-build-sparse-threads nil))
8468     (prog1
8469         (gnus-summary-limit (nconc articles gnus-newsgroup-limit))
8470       (gnus-summary-limit-include-matching-articles
8471        "subject"
8472        (regexp-quote (gnus-simplify-subject-re
8473                       (mail-header-subject (gnus-id-to-header id)))))
8474       (gnus-summary-position-point))))
8475
8476 (defun gnus-summary-limit-include-matching-articles (header regexp)
8477   "Display all the hidden articles that have HEADERs that match REGEXP."
8478   (interactive (list (read-string "Match on header: ")
8479                      (read-string "Regexp: ")))
8480   (let ((articles (gnus-find-matching-articles header regexp)))
8481     (prog1
8482         (gnus-summary-limit (nconc articles gnus-newsgroup-limit))
8483       (gnus-summary-position-point))))
8484
8485 (defun gnus-summary-insert-dormant-articles ()
8486   "Insert all the dormant articles for this group into the current buffer."
8487   (interactive)
8488   (let ((gnus-verbose (max 6 gnus-verbose)))
8489     (if (not gnus-newsgroup-dormant)
8490         (gnus-message 3 "No dormant articles for this group")
8491       (gnus-summary-goto-subjects gnus-newsgroup-dormant))))
8492
8493 (defun gnus-summary-insert-ticked-articles ()
8494   "Insert ticked articles for this group into the current buffer."
8495   (interactive)
8496   (let ((gnus-verbose (max 6 gnus-verbose)))
8497     (if (not gnus-newsgroup-marked)
8498         (gnus-message 3 "No ticked articles for this group")
8499       (gnus-summary-goto-subjects gnus-newsgroup-marked))))
8500
8501 (defun gnus-summary-limit-include-dormant ()
8502   "Display all the hidden articles that are marked as dormant.
8503 Note that this command only works on a subset of the articles currently
8504 fetched for this group."
8505   (interactive)
8506   (unless gnus-newsgroup-dormant
8507     (error "There are no dormant articles in this group"))
8508   (prog1
8509       (gnus-summary-limit (append gnus-newsgroup-dormant gnus-newsgroup-limit))
8510     (gnus-summary-position-point)))
8511
8512 (defun gnus-summary-include-articles (articles)
8513   "Fetch the headers for ARTICLES and then display the summary lines."
8514   (let ((gnus-inhibit-demon t)
8515         (gnus-agent nil)
8516         (gnus-read-all-available-headers t))
8517     (setq gnus-newsgroup-headers
8518           (gnus-merge
8519            'list gnus-newsgroup-headers
8520            (gnus-fetch-headers articles nil t)
8521            'gnus-article-sort-by-number))
8522     (gnus-summary-limit (append articles gnus-newsgroup-limit))))
8523
8524 (defun gnus-summary-limit-exclude-dormant ()
8525   "Hide all dormant articles."
8526   (interactive)
8527   (prog1
8528       (gnus-summary-limit-to-marks (list gnus-dormant-mark) 'reverse)
8529     (gnus-summary-position-point)))
8530
8531 (defun gnus-summary-limit-exclude-childless-dormant ()
8532   "Hide all dormant articles that have no children."
8533   (interactive)
8534   (let ((data (gnus-data-list t))
8535         articles d children)
8536     ;; Find all articles that are either not dormant or have
8537     ;; children.
8538     (while (setq d (pop data))
8539       (when (or (not (= (gnus-data-mark d) gnus-dormant-mark))
8540                 (and (setq children
8541                            (gnus-article-children (gnus-data-number d)))
8542                      (let (found)
8543                        (while children
8544                          (when (memq (car children) articles)
8545                            (setq children nil
8546                                  found t))
8547                          (pop children))
8548                        found)))
8549         (push (gnus-data-number d) articles)))
8550     ;; Do the limiting.
8551     (prog1
8552         (gnus-summary-limit articles)
8553       (gnus-summary-position-point))))
8554
8555 (defun gnus-summary-limit-mark-excluded-as-read (&optional all)
8556   "Mark all unread excluded articles as read.
8557 If ALL, mark even excluded ticked and dormants as read."
8558   (interactive "P")
8559   (setq gnus-newsgroup-limit (sort gnus-newsgroup-limit '<))
8560   (let ((articles (gnus-sorted-ndifference
8561                    (sort
8562                     (mapcar (lambda (h) (mail-header-number h))
8563                             gnus-newsgroup-headers)
8564                     '<)
8565                    gnus-newsgroup-limit))
8566         article)
8567     (setq gnus-newsgroup-unreads
8568           (gnus-sorted-intersection gnus-newsgroup-unreads
8569                                     gnus-newsgroup-limit))
8570     (if all
8571         (setq gnus-newsgroup-dormant nil
8572               gnus-newsgroup-marked nil
8573               gnus-newsgroup-reads
8574               (nconc
8575                (mapcar (lambda (n) (cons n gnus-catchup-mark)) articles)
8576                gnus-newsgroup-reads))
8577       (while (setq article (pop articles))
8578         (unless (or (memq article gnus-newsgroup-dormant)
8579                     (memq article gnus-newsgroup-marked))
8580           (push (cons article gnus-catchup-mark) gnus-newsgroup-reads))))))
8581
8582 (defun gnus-summary-limit (articles &optional pop)
8583   (if pop
8584       ;; We pop the previous limit off the stack and use that.
8585       (setq articles (car gnus-newsgroup-limits)
8586             gnus-newsgroup-limits (cdr gnus-newsgroup-limits))
8587     ;; We use the new limit, so we push the old limit on the stack.
8588     (push gnus-newsgroup-limit gnus-newsgroup-limits))
8589   ;; Set the limit.
8590   (setq gnus-newsgroup-limit articles)
8591   (let ((total (length gnus-newsgroup-data))
8592         (data (gnus-data-find-list (gnus-summary-article-number)))
8593         (gnus-summary-mark-below nil)   ; Inhibit this.
8594         found)
8595     ;; This will do all the work of generating the new summary buffer
8596     ;; according to the new limit.
8597     (gnus-summary-prepare)
8598     ;; Hide any threads, possibly.
8599     (gnus-summary-maybe-hide-threads)
8600     ;; Try to return to the article you were at, or one in the
8601     ;; neighborhood.
8602     (when data
8603       ;; We try to find some article after the current one.
8604       (while data
8605         (when (gnus-summary-goto-subject (gnus-data-number (car data)) nil t)
8606           (setq data nil
8607                 found t))
8608         (setq data (cdr data))))
8609     (unless found
8610       ;; If there is no data, that means that we were after the last
8611       ;; article.  The same goes when we can't find any articles
8612       ;; after the current one.
8613       (goto-char (point-max))
8614       (gnus-summary-find-prev))
8615     (gnus-set-mode-line 'summary)
8616     ;; We return how many articles were removed from the summary
8617     ;; buffer as a result of the new limit.
8618     (- total (length gnus-newsgroup-data))))
8619
8620 (defsubst gnus-invisible-cut-children (threads)
8621   (let ((num 0))
8622     (while threads
8623       (when (memq (mail-header-number (caar threads)) gnus-newsgroup-limit)
8624         (incf num))
8625       (pop threads))
8626     (< num 2)))
8627
8628 (defsubst gnus-cut-thread (thread)
8629   "Go forwards in the thread until we find an article that we want to display."
8630   (when (or (eq gnus-fetch-old-headers 'some)
8631             (eq gnus-fetch-old-headers 'invisible)
8632             (numberp gnus-fetch-old-headers)
8633             (eq gnus-build-sparse-threads 'some)
8634             (eq gnus-build-sparse-threads 'more))
8635     ;; Deal with old-fetched headers and sparse threads.
8636     (while (and
8637             thread
8638             (or
8639              (gnus-summary-article-sparse-p (mail-header-number (car thread)))
8640              (gnus-summary-article-ancient-p
8641               (mail-header-number (car thread))))
8642             (if (or (<= (length (cdr thread)) 1)
8643                     (eq gnus-fetch-old-headers 'invisible))
8644                 (setq gnus-newsgroup-limit
8645                       (delq (mail-header-number (car thread))
8646                             gnus-newsgroup-limit)
8647                       thread (cadr thread))
8648               (when (gnus-invisible-cut-children (cdr thread))
8649                 (let ((th (cdr thread)))
8650                   (while th
8651                     (if (memq (mail-header-number (caar th))
8652                               gnus-newsgroup-limit)
8653                         (setq thread (car th)
8654                               th nil)
8655                       (setq th (cdr th))))))))))
8656   thread)
8657
8658 (defun gnus-cut-threads (threads)
8659   "Cut off all uninteresting articles from the beginning of THREADS."
8660   (when (or (eq gnus-fetch-old-headers 'some)
8661             (eq gnus-fetch-old-headers 'invisible)
8662             (numberp gnus-fetch-old-headers)
8663             (eq gnus-build-sparse-threads 'some)
8664             (eq gnus-build-sparse-threads 'more))
8665     (let ((th threads))
8666       (while th
8667         (setcar th (gnus-cut-thread (car th)))
8668         (setq th (cdr th)))))
8669   ;; Remove nixed out threads.
8670   (delq nil threads))
8671
8672 (defun gnus-summary-initial-limit (&optional show-if-empty)
8673   "Figure out what the initial limit is supposed to be on group entry.
8674 This entails weeding out unwanted dormants, low-scored articles,
8675 fetch-old-headers verbiage, and so on."
8676   ;; Most groups have nothing to remove.
8677   (unless (or gnus-inhibit-limiting
8678               (and (null gnus-newsgroup-dormant)
8679                    (eq gnus-newsgroup-display 'gnus-not-ignore)
8680                    (not (eq gnus-fetch-old-headers 'some))
8681                    (not (numberp gnus-fetch-old-headers))
8682                    (not (eq gnus-fetch-old-headers 'invisible))
8683                    (null gnus-summary-expunge-below)
8684                    (not (eq gnus-build-sparse-threads 'some))
8685                    (not (eq gnus-build-sparse-threads 'more))
8686                    (null gnus-thread-expunge-below)))
8687     (push gnus-newsgroup-limit gnus-newsgroup-limits)
8688     (setq gnus-newsgroup-limit nil)
8689     (mapatoms
8690      (lambda (node)
8691        (unless (car (symbol-value node))
8692          ;; These threads have no parents -- they are roots.
8693          (let ((nodes (cdr (symbol-value node)))
8694                thread)
8695            (while nodes
8696              (if (and gnus-thread-expunge-below
8697                       (< (gnus-thread-total-score (car nodes))
8698                          gnus-thread-expunge-below))
8699                  (gnus-expunge-thread (pop nodes))
8700                (setq thread (pop nodes))
8701                (gnus-summary-limit-children thread))))))
8702      gnus-newsgroup-dependencies)
8703     ;; If this limitation resulted in an empty group, we might
8704     ;; pop the previous limit and use it instead.
8705     (when (and (not gnus-newsgroup-limit)
8706                show-if-empty)
8707       (setq gnus-newsgroup-limit (pop gnus-newsgroup-limits)))
8708     gnus-newsgroup-limit))
8709
8710 (defun gnus-summary-limit-children (thread)
8711   "Return 1 if this subthread is visible and 0 if it is not."
8712   ;; First we get the number of visible children to this thread.  This
8713   ;; is done by recursing down the thread using this function, so this
8714   ;; will really go down to a leaf article first, before slowly
8715   ;; working its way up towards the root.
8716   (when thread
8717     (let* ((max-lisp-eval-depth (max 5000 max-lisp-eval-depth))
8718            (children
8719            (if (cdr thread)
8720                (apply '+ (mapcar 'gnus-summary-limit-children
8721                                  (cdr thread)))
8722              0))
8723            (number (mail-header-number (car thread)))
8724            score)
8725       (if (and
8726            (not (memq number gnus-newsgroup-marked))
8727            (or
8728             ;; If this article is dormant and has absolutely no visible
8729             ;; children, then this article isn't visible.
8730             (and (memq number gnus-newsgroup-dormant)
8731                  (zerop children))
8732             ;; If this is "fetch-old-headered" and there is no
8733             ;; visible children, then we don't want this article.
8734             (and (or (eq gnus-fetch-old-headers 'some)
8735                      (numberp gnus-fetch-old-headers))
8736                  (gnus-summary-article-ancient-p number)
8737                  (zerop children))
8738             ;; If this is "fetch-old-headered" and `invisible', then
8739             ;; we don't want this article.
8740             (and (eq gnus-fetch-old-headers 'invisible)
8741                  (gnus-summary-article-ancient-p number))
8742             ;; If this is a sparsely inserted article with no children,
8743             ;; we don't want it.
8744             (and (eq gnus-build-sparse-threads 'some)
8745                  (gnus-summary-article-sparse-p number)
8746                  (zerop children))
8747             ;; If we use expunging, and this article is really
8748             ;; low-scored, then we don't want this article.
8749             (when (and gnus-summary-expunge-below
8750                        (< (setq score
8751                                 (or (cdr (assq number gnus-newsgroup-scored))
8752                                     gnus-summary-default-score))
8753                           gnus-summary-expunge-below))
8754               ;; We increase the expunge-tally here, but that has
8755               ;; nothing to do with the limits, really.
8756               (incf gnus-newsgroup-expunged-tally)
8757               ;; We also mark as read here, if that's wanted.
8758               (when (and gnus-summary-mark-below
8759                          (< score gnus-summary-mark-below))
8760                 (setq gnus-newsgroup-unreads
8761                       (delq number gnus-newsgroup-unreads))
8762                 (if gnus-newsgroup-auto-expire
8763                     (push number gnus-newsgroup-expirable)
8764                   (push (cons number gnus-low-score-mark)
8765                         gnus-newsgroup-reads)))
8766               t)
8767             ;; Do the `display' group parameter.
8768             (and gnus-newsgroup-display
8769                  (let ((gnus-number number))
8770                    (not (funcall gnus-newsgroup-display))))))
8771           ;; Nope, invisible article.
8772           0
8773         ;; Ok, this article is to be visible, so we add it to the limit
8774         ;; and return 1.
8775         (push number gnus-newsgroup-limit)
8776         1))))
8777
8778 (defun gnus-expunge-thread (thread)
8779   "Mark all articles in THREAD as read."
8780   (let* ((number (mail-header-number (car thread))))
8781     (incf gnus-newsgroup-expunged-tally)
8782     ;; We also mark as read here, if that's wanted.
8783     (setq gnus-newsgroup-unreads
8784           (delq number gnus-newsgroup-unreads))
8785     (if gnus-newsgroup-auto-expire
8786         (push number gnus-newsgroup-expirable)
8787       (push (cons number gnus-low-score-mark)
8788             gnus-newsgroup-reads)))
8789   ;; Go recursively through all subthreads.
8790   (mapcar 'gnus-expunge-thread (cdr thread)))
8791
8792 ;; Summary article oriented commands
8793
8794 (defun gnus-summary-refer-parent-article (n)
8795   "Refer parent article N times.
8796 If N is negative, go to ancestor -N instead.
8797 The difference between N and the number of articles fetched is returned."
8798   (interactive "p")
8799   (let ((skip 1)
8800         error header ref)
8801     (when (not (natnump n))
8802       (setq skip (abs n)
8803             n 1))
8804     (while (and (> n 0)
8805                 (not error))
8806       (setq header (gnus-summary-article-header))
8807       (if (and (eq (mail-header-number header)
8808                    (cdr gnus-article-current))
8809                (equal gnus-newsgroup-name
8810                       (car gnus-article-current)))
8811           ;; If we try to find the parent of the currently
8812           ;; displayed article, then we take a look at the actual
8813           ;; References header, since this is slightly more
8814           ;; reliable than the References field we got from the
8815           ;; server.
8816           (with-current-buffer gnus-original-article-buffer
8817             (nnheader-narrow-to-headers)
8818             (unless (setq ref (message-fetch-field "references"))
8819               (when (setq ref (message-fetch-field "in-reply-to"))
8820                 (setq ref (gnus-extract-message-id-from-in-reply-to ref))))
8821             (widen))
8822         (setq ref
8823               ;; It's not the current article, so we take a bet on
8824               ;; the value we got from the server.
8825               (mail-header-references header)))
8826       (if (and ref
8827                (not (equal ref "")))
8828           (unless (gnus-summary-refer-article (gnus-parent-id ref skip))
8829             (gnus-message 1 "Couldn't find parent"))
8830         (gnus-message 1 "No references in article %d"
8831                       (gnus-summary-article-number))
8832         (setq error t))
8833       (decf n))
8834     (gnus-summary-position-point)
8835     n))
8836
8837 (defun gnus-summary-refer-references ()
8838   "Fetch all articles mentioned in the References header.
8839 Return the number of articles fetched."
8840   (interactive)
8841   (let ((ref (mail-header-references (gnus-summary-article-header)))
8842         (current (gnus-summary-article-number))
8843         (n 0))
8844     (if (or (not ref)
8845             (equal ref ""))
8846         (error "No References in the current article")
8847       ;; For each Message-ID in the References header...
8848       (while (string-match "<[^>]*>" ref)
8849         (incf n)
8850         ;; ... fetch that article.
8851         (gnus-summary-refer-article
8852          (prog1 (match-string 0 ref)
8853            (setq ref (substring ref (match-end 0))))))
8854       (gnus-summary-goto-subject current)
8855       (gnus-summary-position-point)
8856       n)))
8857
8858 (defun gnus-summary-refer-thread (&optional limit)
8859   "Fetch all articles in the current thread.
8860 If no backend-specific 'request-thread function is available
8861 fetch LIMIT (the numerical prefix) old headers. If LIMIT is nil
8862 fetch what's specified by the `gnus-refer-thread-limit'
8863 variable."
8864   (interactive "P")
8865   (gnus-warp-to-article)
8866   (let* ((header (gnus-summary-article-header))
8867          (id (mail-header-id header))
8868          (gnus-inhibit-demon t)
8869          (gnus-summary-ignore-duplicates t)
8870          (gnus-read-all-available-headers t)
8871          (limit (if limit (prefix-numeric-value limit)
8872                   gnus-refer-thread-limit)))
8873     (setq gnus-newsgroup-headers
8874           (gnus-merge
8875            'list gnus-newsgroup-headers
8876            (if (gnus-check-backend-function
8877                 'request-thread gnus-newsgroup-name)
8878                (gnus-request-thread header)
8879              (let* ((last (if (numberp limit)
8880                               (min (+ (mail-header-number header)
8881                                       limit)
8882                                    gnus-newsgroup-highest)
8883                             gnus-newsgroup-highest))
8884                     (subject (gnus-simplify-subject
8885                               (mail-header-subject header)))
8886                     (refs (split-string (or (mail-header-references header)
8887                                             "")))
8888                     (gnus-parse-headers-hook
8889                      (lambda () (goto-char (point-min))
8890                        (keep-lines
8891                         (regexp-opt (append refs (list id subject)))))))
8892                (gnus-fetch-headers (list last) (if (numberp limit)
8893                                                    (* 2 limit) limit) t)))
8894            'gnus-article-sort-by-number))
8895     (gnus-summary-limit-include-thread id)))
8896
8897 (defun gnus-summary-refer-article (message-id)
8898   "Fetch an article specified by MESSAGE-ID."
8899   (interactive "sMessage-ID: ")
8900   (when (and (stringp message-id)
8901              (not (zerop (length message-id))))
8902     (setq message-id (gnus-replace-in-string message-id " " ""))
8903     ;; Construct the correct Message-ID if necessary.
8904     ;; Suggested by tale@pawl.rpi.edu.
8905     (unless (string-match "^<" message-id)
8906       (setq message-id (concat "<" message-id)))
8907     (unless (string-match ">$" message-id)
8908       (setq message-id (concat message-id ">")))
8909     ;; People often post MIDs from URLs, so unhex it:
8910     (unless (string-match "@" message-id)
8911       (setq message-id (gnus-url-unhex-string message-id)))
8912     (let* ((header (gnus-id-to-header message-id))
8913            (sparse (and header
8914                         (gnus-summary-article-sparse-p
8915                          (mail-header-number header))
8916                         (memq (mail-header-number header)
8917                               gnus-newsgroup-limit)))
8918            number)
8919       (cond
8920        ;; If the article is present in the buffer we just go to it.
8921        ((and header
8922              (or (not (gnus-summary-article-sparse-p
8923                        (mail-header-number header)))
8924                  sparse))
8925         (prog1
8926             (gnus-summary-goto-article
8927              (mail-header-number header) nil t)
8928           (when sparse
8929             (gnus-summary-update-article (mail-header-number header)))))
8930        (t
8931         ;; We fetch the article.
8932         (catch 'found
8933           (dolist (gnus-override-method (gnus-refer-article-methods))
8934             (when (and (gnus-check-server gnus-override-method)
8935                        ;; Fetch the header,
8936                        (setq number (gnus-summary-insert-subject message-id)))
8937               ;; and display the article.
8938               (gnus-summary-select-article nil nil nil number)
8939               (throw 'found t)))
8940           (gnus-message 3 "Couldn't fetch article %s" message-id)))))))
8941
8942 (defun gnus-refer-article-methods ()
8943   "Return a list of referable methods."
8944   (cond
8945    ;; No method, so we default to current and native.
8946    ((null gnus-refer-article-method)
8947     (list gnus-current-select-method gnus-select-method))
8948    ;; Current.
8949    ((eq 'current gnus-refer-article-method)
8950     (list gnus-current-select-method))
8951    ;; List of select methods.
8952    ((not (and (symbolp (car gnus-refer-article-method))
8953               (assq (car gnus-refer-article-method) nnoo-definition-alist)))
8954     (let (out)
8955       (dolist (method gnus-refer-article-method)
8956         (push (if (eq 'current method)
8957                   gnus-current-select-method
8958                 method)
8959               out))
8960       (nreverse out)))
8961    ;; One single select method.
8962    (t
8963     (list gnus-refer-article-method))))
8964
8965 (defun gnus-summary-edit-parameters ()
8966   "Edit the group parameters of the current group."
8967   (interactive)
8968   (gnus-group-edit-group gnus-newsgroup-name 'params))
8969
8970 (defun gnus-summary-customize-parameters ()
8971   "Customize the group parameters of the current group."
8972   (interactive)
8973   (gnus-group-customize gnus-newsgroup-name))
8974
8975 (defun gnus-summary-enter-digest-group (&optional force)
8976   "Enter an nndoc group based on the current article.
8977 If FORCE, force a digest interpretation.  If not, try to guess
8978 what the document format is.
8979
8980 To control what happens when you exit the group, see the
8981 `gnus-auto-select-on-ephemeral-exit' variable."
8982   (interactive "P")
8983   (let ((conf gnus-current-window-configuration))
8984     (save-window-excursion
8985       (save-excursion
8986         (let (gnus-article-prepare-hook
8987               gnus-display-mime-function
8988               gnus-break-pages)
8989           (gnus-summary-select-article))))
8990     (setq gnus-current-window-configuration conf)
8991     (let* ((name (format "%s-%d"
8992                          (gnus-group-prefixed-name
8993                           gnus-newsgroup-name (list 'nndoc ""))
8994                          (with-current-buffer gnus-summary-buffer
8995                            gnus-current-article)))
8996            (ogroup gnus-newsgroup-name)
8997            (params (append (gnus-info-params (gnus-get-info ogroup))
8998                            (list (cons 'to-group ogroup))
8999                            (list (cons 'parent-group ogroup))
9000                            (list (cons 'save-article-group ogroup))))
9001            (case-fold-search t)
9002            (buf (current-buffer))
9003            dig to-address)
9004       (with-current-buffer gnus-original-article-buffer
9005         ;; Have the digest group inherit the main mail address of
9006         ;; the parent article.
9007         (when (setq to-address (or (gnus-fetch-field "reply-to")
9008                                    (gnus-fetch-field "from")))
9009           (setq params
9010                 (append
9011                  (list (cons 'to-address
9012                              (funcall gnus-decode-encoded-address-function
9013                                       to-address))))))
9014         (setq dig (nnheader-set-temp-buffer " *gnus digest buffer*"))
9015         (insert-buffer-substring gnus-original-article-buffer)
9016         ;; Remove lines that may lead nndoc to misinterpret the
9017         ;; document type.
9018         (narrow-to-region
9019          (goto-char (point-min))
9020          (or (search-forward "\n\n" nil t) (point)))
9021         (goto-char (point-min))
9022         (delete-matching-lines "^Path:\\|^From ")
9023         (widen))
9024       (unwind-protect
9025           (if (let ((gnus-newsgroup-ephemeral-charset gnus-newsgroup-charset)
9026                     (gnus-newsgroup-ephemeral-ignored-charsets
9027                      gnus-newsgroup-ignored-charsets))
9028                 (gnus-group-read-ephemeral-group
9029                  name `(nndoc ,name (nndoc-address ,(get-buffer dig))
9030                               (nndoc-article-type
9031                                ,(if force 'mbox 'guess)))
9032                  t nil nil nil
9033                  `((adapt-file . ,(gnus-score-file-name gnus-newsgroup-name
9034                                                         "ADAPT")))))
9035               ;; Make all postings to this group go to the parent group.
9036               (nconc (gnus-info-params (gnus-get-info name))
9037                      params)
9038             ;; Couldn't select this doc group.
9039             (switch-to-buffer buf)
9040             (gnus-set-global-variables)
9041             (gnus-configure-windows 'summary)
9042             (gnus-message 3 "Article couldn't be entered?"))
9043         (kill-buffer dig)))))
9044
9045 (defun gnus-summary-read-document (n)
9046   "Open a new group based on the current article(s).
9047 This will allow you to read digests and other similar
9048 documents as newsgroups.
9049 Obeys the standard process/prefix convention."
9050   (interactive "P")
9051   (let* ((ogroup gnus-newsgroup-name)
9052          (params (append (gnus-info-params (gnus-get-info ogroup))
9053                          (list (cons 'to-group ogroup))))
9054          group egroup groups vgroup)
9055     (dolist (article (gnus-summary-work-articles n))
9056       (setq group (format "%s-%d" gnus-newsgroup-name article))
9057       (gnus-summary-remove-process-mark article)
9058       (when (gnus-summary-display-article article)
9059         (save-excursion ;;What for?
9060           (with-temp-buffer
9061             (insert-buffer-substring gnus-original-article-buffer)
9062             ;; Remove some headers that may lead nndoc to make
9063             ;; the wrong guess.
9064             (message-narrow-to-head)
9065             (goto-char (point-min))
9066             (delete-matching-lines "^Path:\\|^From ")
9067             (widen)
9068             (if (setq egroup
9069                       (gnus-group-read-ephemeral-group
9070                        group `(nndoc ,group (nndoc-address ,(current-buffer))
9071                                      (nndoc-article-type guess))
9072                        t nil t))
9073                 (progn
9074                   ;; Make all postings to this group go to the parent group.
9075                   (nconc (gnus-info-params (gnus-get-info egroup))
9076                          params)
9077                   (push egroup groups))
9078               ;; Couldn't select this doc group.
9079               (gnus-error 3 "Article couldn't be entered"))))))
9080     ;; Now we have selected all the documents.
9081     (cond
9082      ((not groups)
9083       (error "None of the articles could be interpreted as documents"))
9084      ((gnus-group-read-ephemeral-group
9085        (setq vgroup (format
9086                      "nnvirtual:%s-%s" gnus-newsgroup-name
9087                      (format-time-string "%Y%m%dT%H%M%S" (current-time))))
9088        `(nnvirtual ,vgroup (nnvirtual-component-groups ,groups))
9089        t
9090        (cons (current-buffer) 'summary)))
9091      (t
9092       (error "Couldn't select virtual nndoc group")))))
9093
9094 (defun gnus-summary-widget-forward (arg)
9095   "Move point to the next field or button in the article.
9096 With optional ARG, move across that many fields."
9097   (interactive "p")
9098   (gnus-summary-select-article)
9099   (gnus-configure-windows 'article)
9100   (select-window (gnus-get-buffer-window gnus-article-buffer))
9101   (widget-forward arg))
9102
9103 (defun gnus-summary-isearch-article (&optional regexp-p)
9104   "Do incremental search forward on the current article.
9105 If REGEXP-P (the prefix) is non-nil, do regexp isearch."
9106   (interactive "P")
9107   (gnus-summary-select-article)
9108   (gnus-configure-windows 'article)
9109   (gnus-eval-in-buffer-window gnus-article-buffer
9110     (save-restriction
9111       (widen)
9112       (isearch-forward regexp-p))))
9113
9114 (defun gnus-summary-repeat-search-article-forward ()
9115   "Repeat the previous search forwards."
9116   (interactive)
9117   (unless gnus-last-search-regexp
9118     (error "No previous search"))
9119   (gnus-summary-search-article-forward gnus-last-search-regexp))
9120
9121 (defun gnus-summary-repeat-search-article-backward ()
9122   "Repeat the previous search backwards."
9123   (interactive)
9124   (unless gnus-last-search-regexp
9125     (error "No previous search"))
9126   (gnus-summary-search-article-forward gnus-last-search-regexp t))
9127
9128 (defun gnus-summary-search-article-forward (regexp &optional backward)
9129   "Search for an article containing REGEXP forward.
9130 If BACKWARD, search backward instead."
9131   (interactive
9132    (list (read-string
9133           (format "Search article %s (regexp%s): "
9134                   (if current-prefix-arg "backward" "forward")
9135                   (if gnus-last-search-regexp
9136                       (concat ", default " gnus-last-search-regexp)
9137                     "")))
9138          current-prefix-arg))
9139   (if (string-equal regexp "")
9140       (setq regexp (or gnus-last-search-regexp ""))
9141     (setq gnus-last-search-regexp regexp)
9142     (setq gnus-article-before-search gnus-current-article))
9143   ;; Intentionally set gnus-last-article.
9144   (setq gnus-last-article gnus-article-before-search)
9145   (let ((gnus-last-article gnus-last-article))
9146     (if (gnus-summary-search-article regexp backward)
9147         (gnus-summary-show-thread)
9148       (signal 'search-failed (list regexp)))))
9149
9150 (defun gnus-summary-search-article-backward (regexp)
9151   "Search for an article containing REGEXP backward."
9152   (interactive
9153    (list (read-string
9154           (format "Search article backward (regexp%s): "
9155                   (if gnus-last-search-regexp
9156                       (concat ", default " gnus-last-search-regexp)
9157                     "")))))
9158   (gnus-summary-search-article-forward regexp 'backward))
9159
9160 (defun gnus-summary-search-article (regexp &optional backward)
9161   "Search for an article containing REGEXP.
9162 Optional argument BACKWARD means do search for backward.
9163 `gnus-select-article-hook' is not called during the search."
9164   ;; We have to require this here to make sure that the following
9165   ;; dynamic binding isn't shadowed by autoloading.
9166   (require 'gnus-async)
9167   (require 'gnus-art)
9168   (let ((gnus-select-article-hook nil)  ;Disable hook.
9169         (gnus-article-prepare-hook nil)
9170         (gnus-mark-article-hook nil)    ;Inhibit marking as read.
9171         (gnus-use-article-prefetch nil)
9172         (gnus-xmas-force-redisplay nil) ;Inhibit XEmacs redisplay.
9173         (gnus-use-trees nil)            ;Inhibit updating tree buffer.
9174         (gnus-visual nil)
9175         (gnus-keep-backlog nil)
9176         (gnus-break-pages nil)
9177         (gnus-summary-display-arrow nil)
9178         (gnus-updated-mode-lines nil)
9179         (gnus-auto-center-summary nil)
9180         (sum (current-buffer))
9181         (gnus-display-mime-function nil)
9182         (found nil)
9183         point)
9184     (gnus-save-hidden-threads
9185       (gnus-summary-select-article)
9186       (set-buffer gnus-article-buffer)
9187       (goto-char (window-point (get-buffer-window (current-buffer))))
9188       (when backward
9189         (forward-line -1))
9190       (while (not found)
9191         (gnus-message 7 "Searching article: %d..." (cdr gnus-article-current))
9192         (if (if backward
9193                 (re-search-backward regexp nil t)
9194               (re-search-forward regexp nil t))
9195             ;; We found the regexp.
9196             (progn
9197               (setq found 'found)
9198               (beginning-of-line)
9199               (set-window-start
9200                (get-buffer-window (current-buffer))
9201                (point))
9202               (forward-line 1)
9203               (set-window-point
9204                (get-buffer-window (current-buffer))
9205                (point))
9206               (set-buffer sum)
9207               (setq point (point)))
9208           ;; We didn't find it, so we go to the next article.
9209           (set-buffer sum)
9210           (setq found 'not)
9211           (while (eq found 'not)
9212             (if (not (if backward (gnus-summary-find-prev)
9213                        (gnus-summary-find-next)))
9214                 ;; No more articles.
9215                 (setq found t)
9216               ;; Select the next article and adjust point.
9217               (unless (gnus-summary-article-sparse-p
9218                        (gnus-summary-article-number))
9219                 (setq found nil)
9220                 (gnus-summary-select-article)
9221                 (set-buffer gnus-article-buffer)
9222                 (widen)
9223                 (goto-char (if backward (point-max) (point-min))))))))
9224       (gnus-message 7 ""))
9225     ;; Return whether we found the regexp.
9226     (when (eq found 'found)
9227       (goto-char point)
9228       (gnus-summary-show-thread)
9229       (gnus-summary-goto-subject gnus-current-article)
9230       (gnus-summary-position-point)
9231       t)))
9232
9233 (defun gnus-find-matching-articles (header regexp)
9234   "Return a list of all articles that match REGEXP on HEADER.
9235 This search includes all articles in the current group that Gnus has
9236 fetched headers for, whether they are displayed or not."
9237   (let ((articles nil)
9238         ;; Can't eta-reduce because it's a macro.
9239         (func `(lambda (h) (,(intern (concat "mail-header-" header)) h)))
9240         (case-fold-search t))
9241     (dolist (header gnus-newsgroup-headers)
9242       (when (string-match regexp (funcall func header))
9243         (push (mail-header-number header) articles)))
9244     (nreverse articles)))
9245
9246 (defun gnus-summary-find-matching (header regexp &optional backward unread
9247                                           not-case-fold not-matching)
9248   "Return a list of all articles that match REGEXP on HEADER.
9249 The search stars on the current article and goes forwards unless
9250 BACKWARD is non-nil.  If BACKWARD is `all', do all articles.
9251 If UNREAD is non-nil, only unread articles will
9252 be taken into consideration.  If NOT-CASE-FOLD, case won't be folded
9253 in the comparisons. If NOT-MATCHING, return a list of all articles that
9254 not match REGEXP on HEADER."
9255   (let ((case-fold-search (not not-case-fold))
9256         articles d func)
9257     (if (consp header)
9258         (if (eq (car header) 'extra)
9259             (setq func
9260                   `(lambda (h)
9261                      (or (cdr (assq ',(cdr header) (mail-header-extra h)))
9262                          "")))
9263           (error "%s is an invalid header" header))
9264       (unless (fboundp (intern (concat "mail-header-" header)))
9265         (error "%s is not a valid header" header))
9266       (setq func `(lambda (h) (,(intern (concat "mail-header-" header)) h))))
9267     (dolist (d (if (eq backward 'all)
9268                    gnus-newsgroup-data
9269                  (gnus-data-find-list
9270                   (gnus-summary-article-number)
9271                   (gnus-data-list backward))))
9272       (when (and (or (not unread)       ; We want all articles...
9273                      (gnus-data-unread-p d)) ; Or just unreads.
9274                  (vectorp (gnus-data-header d)) ; It's not a pseudo.
9275                  (if not-matching
9276                      (not (string-match
9277                            regexp
9278                            (funcall func (gnus-data-header d))))
9279                    (string-match regexp
9280                                  (funcall func (gnus-data-header d)))))
9281         (push (gnus-data-number d) articles))) ; Success!
9282     (nreverse articles)))
9283
9284 (defun gnus-summary-execute-command (header regexp command &optional backward)
9285   "Search forward for an article whose HEADER matches REGEXP and execute COMMAND.
9286 If HEADER is an empty string (or nil), the match is done on the entire
9287 article.  If BACKWARD (the prefix) is non-nil, search backward instead."
9288   (interactive
9289    (list (let ((completion-ignore-case t))
9290            (gnus-completing-read
9291             "Header name"
9292             (mapcar 'symbol-name
9293                     (append
9294                      '(Number Subject From Lines Date
9295                        Message-ID Xref References Body)
9296                      gnus-extra-headers))
9297             'require-match))
9298          (read-string "Regexp: ")
9299          (read-key-sequence "Command: ")
9300          current-prefix-arg))
9301   (when (equal header "Body")
9302     (setq header ""))
9303   ;; Hidden thread subtrees must be searched as well.
9304   (gnus-summary-show-all-threads)
9305   ;; We don't want to change current point nor window configuration.
9306   (save-excursion
9307     (save-window-excursion
9308       (let (gnus-visual
9309             gnus-treat-strip-trailing-blank-lines
9310             gnus-treat-strip-leading-blank-lines
9311             gnus-treat-strip-multiple-blank-lines
9312             gnus-treat-hide-boring-headers
9313             gnus-treat-fold-newsgroups
9314             gnus-article-prepare-hook)
9315         (gnus-message 6 "Executing %s..." (key-description command))
9316         ;; We'd like to execute COMMAND interactively so as to give arguments.
9317         (gnus-execute header regexp
9318                       `(call-interactively ',(key-binding command))
9319                       backward)
9320         (gnus-message 6 "Executing %s...done" (key-description command))))))
9321
9322 (defun gnus-summary-beginning-of-article ()
9323   "Scroll the article back to the beginning."
9324   (interactive)
9325   (gnus-summary-select-article)
9326   (gnus-configure-windows 'article)
9327   (gnus-eval-in-buffer-window gnus-article-buffer
9328     (widen)
9329     (goto-char (point-min))
9330     (when gnus-break-pages
9331       (gnus-narrow-to-page))))
9332
9333 (defun gnus-summary-end-of-article ()
9334   "Scroll to the end of the article."
9335   (interactive)
9336   (gnus-summary-select-article)
9337   (gnus-configure-windows 'article)
9338   (gnus-eval-in-buffer-window gnus-article-buffer
9339     (widen)
9340     (goto-char (point-max))
9341     (recenter -3)
9342     (when gnus-break-pages
9343       (gnus-narrow-to-page))))
9344
9345 (defun gnus-summary-print-truncate-and-quote (string &optional len)
9346   "Truncate to LEN and quote all \"(\"'s in STRING."
9347   (gnus-replace-in-string (if (and len (> (length string) len))
9348                               (substring string 0 len)
9349                             string)
9350                           "[()]" "\\\\\\&"))
9351
9352 (defun gnus-summary-print-article (&optional filename n)
9353   "Generate and print a PostScript image of the process-marked (mail) articles.
9354
9355 If used interactively, print the current article if none are
9356 process-marked.  With prefix arg, prompt the user for the name of the
9357 file to save in.
9358
9359 When used from Lisp, accept two optional args FILENAME and N.  N means
9360 to print the next N articles.  If N is negative, print the N previous
9361 articles.  If N is nil and articles have been marked with the process
9362 mark, print these instead.
9363
9364 If the optional first argument FILENAME is nil, send the image to the
9365 printer.  If FILENAME is a string, save the PostScript image in a file with
9366 that name.  If FILENAME is a number, prompt the user for the name of the file
9367 to save in."
9368   (interactive (list (ps-print-preprint current-prefix-arg)))
9369   (dolist (article (gnus-summary-work-articles n))
9370     (gnus-summary-select-article nil nil 'pseudo article)
9371     (gnus-eval-in-buffer-window gnus-article-buffer
9372       (gnus-print-buffer))
9373     (gnus-summary-remove-process-mark article))
9374   (ps-despool filename))
9375
9376 (defun gnus-print-buffer ()
9377   (let ((ps-left-header
9378          (list
9379           (concat "("
9380                   (gnus-summary-print-truncate-and-quote
9381                    (mail-header-subject gnus-current-headers)
9382                    66) ")")
9383           (concat "("
9384                   (gnus-summary-print-truncate-and-quote
9385                    (mail-header-from gnus-current-headers)
9386                    45) ")")))
9387         (ps-right-header
9388          (list
9389           "/pagenumberstring load"
9390           (concat "("
9391                   (mail-header-date gnus-current-headers) ")"))))
9392     (gnus-run-hooks 'gnus-ps-print-hook)
9393     (save-excursion
9394       (if ps-print-color-p
9395           (ps-spool-buffer-with-faces)
9396         (ps-spool-buffer)))))
9397
9398 (defun gnus-summary-show-complete-article ()
9399   "Show a complete version of the current article.
9400 This is only useful if you're looking at a partial version of the
9401 article currently."
9402   (interactive)
9403   (let ((gnus-keep-backlog nil)
9404         (gnus-use-cache nil)
9405         (gnus-agent nil)
9406         (variable (intern
9407                    (format "%s-fetch-partial-articles"
9408                            (car (gnus-find-method-for-group
9409                                  gnus-newsgroup-name)))
9410                    obarray))
9411         old-val)
9412     (unwind-protect
9413         (progn
9414           (setq old-val (symbol-value variable))
9415           (set variable nil)
9416           (gnus-flush-original-article-buffer)
9417           (gnus-summary-show-article))
9418       (set variable old-val))))
9419
9420 (defun gnus-summary-show-article (&optional arg)
9421   "Force redisplaying of the current article.
9422 If ARG (the prefix) is a number, show the article with the charset
9423 defined in `gnus-summary-show-article-charset-alist', or the charset
9424 input.
9425 If ARG (the prefix) is non-nil and not a number, show the article,
9426 but without running any of the article treatment functions
9427 article.  Normally, the keystroke is `C-u g'.  When using `C-u
9428 C-u g', show the raw article."
9429   (interactive "P")
9430   (cond
9431    ((numberp arg)
9432     (gnus-summary-show-article t)
9433     (let ((gnus-newsgroup-charset
9434            (or (cdr (assq arg gnus-summary-show-article-charset-alist))
9435                (mm-read-coding-system
9436                 "View as charset: " ;; actually it is coding system.
9437                 (with-current-buffer gnus-article-buffer
9438                   (mm-detect-coding-region (point) (point-max))))))
9439           (gnus-newsgroup-ignored-charsets 'gnus-all))
9440       (gnus-summary-select-article nil 'force)
9441       (let ((deps gnus-newsgroup-dependencies)
9442             head header lines)
9443         (with-current-buffer gnus-original-article-buffer
9444           (save-restriction
9445             (message-narrow-to-head)
9446             (setq head (buffer-string))
9447             (goto-char (point-min))
9448             (unless (re-search-forward "^lines:[ \t]\\([0-9]+\\)" nil t)
9449               (goto-char (point-max))
9450               (widen)
9451               (setq lines (1- (count-lines (point) (point-max))))))
9452           (with-temp-buffer
9453             (insert (format "211 %d Article retrieved.\n"
9454                             (cdr gnus-article-current)))
9455             (insert head)
9456             (if lines (insert (format "Lines: %d\n" lines)))
9457             (insert ".\n")
9458             (let ((nntp-server-buffer (current-buffer)))
9459               (setq header (car (gnus-get-newsgroup-headers deps t))))))
9460         (gnus-data-set-header
9461          (gnus-data-find (cdr gnus-article-current))
9462          header)
9463         (gnus-summary-update-article-line
9464          (cdr gnus-article-current) header)
9465         (when (gnus-summary-goto-subject (cdr gnus-article-current) nil t)
9466           (gnus-summary-update-secondary-mark (cdr gnus-article-current))))))
9467    ((not arg)
9468     ;; Select the article the normal way.
9469     (gnus-summary-select-article nil 'force))
9470    ((or (equal arg '(16))
9471         (eq arg t))
9472     ;; C-u C-u g
9473     (let ((gnus-inhibit-article-treatments t))
9474       (gnus-summary-select-article nil 'force)))
9475    (t
9476     ;; We have to require this here to make sure that the following
9477     ;; dynamic binding isn't shadowed by autoloading.
9478     (require 'gnus-async)
9479     (require 'gnus-art)
9480     ;; Bind the article treatment functions to nil.
9481     (let ((gnus-have-all-headers t)
9482           gnus-article-prepare-hook
9483           gnus-article-decode-hook
9484           gnus-display-mime-function
9485           gnus-break-pages)
9486       ;; Destroy any MIME parts.
9487       (when (gnus-buffer-live-p gnus-article-buffer)
9488         (with-current-buffer gnus-article-buffer
9489           (mm-destroy-parts gnus-article-mime-handles)
9490           ;; Set it to nil for safety reason.
9491           (setq gnus-article-mime-handle-alist nil)
9492           (setq gnus-article-mime-handles nil)))
9493       (gnus-summary-select-article nil 'force))))
9494   (gnus-summary-goto-subject gnus-current-article)
9495   (gnus-summary-position-point))
9496
9497 (defun gnus-summary-show-raw-article ()
9498   "Show the raw article without any article massaging functions being run."
9499   (interactive)
9500   (gnus-summary-show-article t))
9501
9502 (defun gnus-summary-verbose-headers (&optional arg)
9503   "Toggle permanent full header display.
9504 If ARG is a positive number, turn header display on.
9505 If ARG is a negative number, turn header display off."
9506   (interactive "P")
9507   (setq gnus-show-all-headers
9508         (cond ((or (not (numberp arg))
9509                    (zerop arg))
9510                (not gnus-show-all-headers))
9511               ((natnump arg)
9512                t)))
9513   (gnus-summary-show-article))
9514
9515 (defun gnus-summary-toggle-header (&optional arg)
9516   "Show the headers if they are hidden, or hide them if they are shown.
9517 If ARG is a positive number, show the entire header.
9518 If ARG is a negative number, hide the unwanted header lines."
9519   (interactive "P")
9520   (let ((window (and (gnus-buffer-live-p gnus-article-buffer)
9521                      (get-buffer-window gnus-article-buffer t))))
9522     (with-current-buffer gnus-article-buffer
9523       (widen)
9524       (article-narrow-to-head)
9525       (let* ((inhibit-read-only t)
9526              (inhibit-point-motion-hooks t)
9527              (hidden (if (numberp arg)
9528                          (>= arg 0)
9529                        (or (not (looking-at "[^ \t\n]+:"))
9530                            (gnus-article-hidden-text-p 'headers))))
9531              s e)
9532         (delete-region (point-min) (point-max))
9533         (with-current-buffer gnus-original-article-buffer
9534           (goto-char (setq s (point-min)))
9535           (setq e (if (search-forward "\n\n" nil t)
9536                       (1- (point))
9537                     (point-max))))
9538         (insert-buffer-substring gnus-original-article-buffer s e)
9539         (run-hooks 'gnus-article-decode-hook)
9540         (if hidden
9541             (let ((gnus-treat-hide-headers nil)
9542                   (gnus-treat-hide-boring-headers nil))
9543               (gnus-delete-wash-type 'headers)
9544               (gnus-treat-article 'head))
9545           (gnus-treat-article 'head))
9546         (widen)
9547         (if window
9548             (set-window-start window (goto-char (point-min))))
9549         (if gnus-break-pages
9550             (gnus-narrow-to-page)
9551           (when (gnus-visual-p 'page-marker)
9552             (let ((inhibit-read-only t))
9553               (gnus-remove-text-with-property 'gnus-prev)
9554               (gnus-remove-text-with-property 'gnus-next))))
9555         (gnus-set-mode-line 'article)))))
9556
9557 (defun gnus-summary-show-all-headers ()
9558   "Make all header lines visible."
9559   (interactive)
9560   (gnus-summary-toggle-header 1))
9561
9562 (defun gnus-summary-caesar-message (&optional arg)
9563   "Caesar rotate the current article by 13.
9564 With a non-numerical prefix, also rotate headers.  A numerical
9565 prefix specifies how many places to rotate each letter forward."
9566   (interactive "P")
9567   (gnus-summary-select-article)
9568   (let ((mail-header-separator ""))
9569     (gnus-eval-in-buffer-window gnus-article-buffer
9570       (save-restriction
9571         (widen)
9572         (let ((start (window-start))
9573               (inhibit-read-only t))
9574           (if (equal arg '(4))
9575               (message-caesar-buffer-body nil t)
9576             (message-caesar-buffer-body arg))
9577           (set-window-start (get-buffer-window (current-buffer)) start)))))
9578   ;; Create buttons and stuff...
9579   (gnus-treat-article nil))
9580
9581 (declare-function idna-to-unicode "ext:idna" (str))
9582
9583 (defun gnus-summary-idna-message (&optional arg)
9584   "Decode IDNA encoded domain names in the current articles.
9585 IDNA encoded domain names looks like `xn--bar'.  If a string
9586 remain unencoded after running this function, it is likely an
9587 invalid IDNA string (`xn--bar' is invalid).
9588
9589 You must have GNU Libidn (URL `http://www.gnu.org/software/libidn/')
9590 installed for this command to work."
9591   (interactive "P")
9592   (if (not (and (condition-case nil (require 'idna)
9593                   (file-error))
9594                 (mm-coding-system-p 'utf-8)
9595                 (executable-find (symbol-value 'idna-program))))
9596       (gnus-message
9597        5 "GNU Libidn not installed properly (`idn' or `idna.el' missing)")
9598     (gnus-summary-select-article)
9599     (let ((mail-header-separator ""))
9600       (gnus-eval-in-buffer-window gnus-article-buffer
9601         (save-restriction
9602           (widen)
9603           (let ((start (window-start))
9604                 buffer-read-only)
9605             (while (re-search-forward "\\(xn--[-0-9a-z]+\\)" nil t)
9606               (replace-match (idna-to-unicode (match-string 1))))
9607             (set-window-start (get-buffer-window (current-buffer)) start)))))))
9608
9609 (defun gnus-summary-morse-message (&optional arg)
9610   "Morse decode the current article."
9611   (interactive "P")
9612   (gnus-summary-select-article)
9613   (let ((mail-header-separator ""))
9614     (gnus-eval-in-buffer-window gnus-article-buffer
9615       (save-excursion
9616         (save-restriction
9617           (widen)
9618           (let ((pos (window-start))
9619                 (inhibit-read-only t))
9620             (goto-char (point-min))
9621             (when (message-goto-body)
9622               (gnus-narrow-to-body))
9623             (goto-char (point-min))
9624             (while (search-forward "·" (point-max) t)
9625               (replace-match "."))
9626             (unmorse-region (point-min) (point-max))
9627             (widen)
9628             (set-window-start (get-buffer-window (current-buffer)) pos)))))))
9629
9630 (defun gnus-summary-stop-page-breaking ()
9631   "Stop page breaking in the current article."
9632   (interactive)
9633   (gnus-summary-select-article)
9634   (gnus-eval-in-buffer-window gnus-article-buffer
9635     (widen)
9636     (when (gnus-visual-p 'page-marker)
9637       (let ((inhibit-read-only t))
9638         (gnus-remove-text-with-property 'gnus-prev)
9639         (gnus-remove-text-with-property 'gnus-next))
9640       (setq gnus-page-broken nil))))
9641
9642 (defun gnus-summary-move-article (&optional n to-newsgroup
9643                                             select-method action)
9644   "Move the current article to a different newsgroup.
9645 If N is a positive number, move the N next articles.
9646 If N is a negative number, move the N previous articles.
9647 If N is nil and any articles have been marked with the process mark,
9648 move those articles instead.
9649 If TO-NEWSGROUP is string, do not prompt for a newsgroup to move to.
9650 If SELECT-METHOD is non-nil, do not move to a specific newsgroup, but
9651 re-spool using this method.
9652
9653 When called interactively with TO-NEWSGROUP being nil, the value of
9654 the variable `gnus-move-split-methods' is used for finding a default
9655 for the target newsgroup.
9656
9657 For this function to work, both the current newsgroup and the
9658 newsgroup that you want to move to have to support the `request-move'
9659 and `request-accept' functions.
9660
9661 ACTION can be either `move' (the default), `crosspost' or `copy'."
9662   (interactive "P")
9663   (unless action
9664     (setq action 'move))
9665   ;; Check whether the source group supports the required functions.
9666   (cond ((and (eq action 'move)
9667               (not (gnus-check-backend-function
9668                     'request-move-article gnus-newsgroup-name)))
9669          (error "The current group does not support article moving"))
9670         ((and (eq action 'crosspost)
9671               (not (gnus-check-backend-function
9672                     'request-replace-article gnus-newsgroup-name)))
9673          (error "The current group does not support article editing")))
9674   (let ((articles (gnus-summary-work-articles n))
9675         (prefix (if (gnus-check-backend-function
9676                      'request-move-article gnus-newsgroup-name)
9677                     (funcall gnus-move-group-prefix-function
9678                              gnus-newsgroup-name)
9679                   ""))
9680         (names '((move "Move" "Moving")
9681                  (copy "Copy" "Copying")
9682                  (crosspost "Crosspost" "Crossposting")))
9683         (copy-buf (save-excursion
9684                     (nnheader-set-temp-buffer " *copy article*")))
9685         art-group to-method new-xref article to-groups
9686         articles-to-update-marks encoded)
9687     (unless (assq action names)
9688       (error "Unknown action %s" action))
9689     ;; Read the newsgroup name.
9690     (when (and (not to-newsgroup)
9691                (not select-method))
9692       (if (and gnus-move-split-methods
9693                (not
9694                 (and (memq gnus-current-article articles)
9695                      (gnus-buffer-live-p gnus-original-article-buffer))))
9696           ;; When `gnus-move-split-methods' is non-nil, we have to
9697           ;; select an article to give `gnus-read-move-group-name' an
9698           ;; opportunity to suggest an appropriate default.  However,
9699           ;; we needn't render or mark the article.
9700           (let ((gnus-display-mime-function nil)
9701                 (gnus-article-prepare-hook nil)
9702                 (gnus-mark-article-hook nil))
9703             (gnus-summary-select-article nil nil nil (car articles))))
9704       (setq to-newsgroup (gnus-read-move-group-name
9705                           (cadr (assq action names))
9706                           (symbol-value
9707                            (intern (format "gnus-current-%s-group" action)))
9708                           articles prefix)
9709             encoded to-newsgroup
9710             to-method (gnus-server-to-method (gnus-group-method to-newsgroup)))
9711       (set (intern (format "gnus-current-%s-group" action))
9712            (mm-decode-coding-string
9713             to-newsgroup
9714             (gnus-group-name-charset to-method to-newsgroup))))
9715     (unless to-method
9716       (setq to-method (or select-method
9717                           (gnus-server-to-method
9718                            (gnus-group-method to-newsgroup)))))
9719     (setq to-newsgroup
9720           (or encoded
9721               (and to-newsgroup
9722                    (mm-encode-coding-string
9723                     to-newsgroup
9724                     (gnus-group-name-charset to-method to-newsgroup)))))
9725     ;; Check the method we are to move this article to...
9726     (unless (gnus-check-backend-function
9727              'request-accept-article (car to-method))
9728       (error "%s does not support article copying" (car to-method)))
9729     (unless (gnus-check-server to-method)
9730       (error "Can't open server %s" (car to-method)))
9731     (gnus-message 6 "%s to %s: %s..."
9732                   (caddr (assq action names))
9733                   (or (car select-method)
9734                       (gnus-group-decoded-name to-newsgroup))
9735                   articles)
9736     (while articles
9737       (setq article (pop articles))
9738       ;; Set any marks that may have changed in the summary buffer.
9739       (when gnus-preserve-marks
9740         (gnus-summary-push-marks-to-backend article))
9741       (setq
9742        art-group
9743        (cond
9744         ;; Move the article.
9745         ((eq action 'move)
9746          ;; Remove this article from future suppression.
9747          (gnus-dup-unsuppress-article article)
9748          (let* ((from-method (gnus-find-method-for-group
9749                               gnus-newsgroup-name))
9750                 (to-method (or select-method
9751                                (gnus-find-method-for-group to-newsgroup)))
9752                 (move-is-internal (gnus-server-equal from-method to-method)))
9753            (gnus-request-move-article
9754             article                     ; Article to move
9755             gnus-newsgroup-name         ; From newsgroup
9756             (nth 1 (gnus-find-method-for-group
9757                     gnus-newsgroup-name)) ; Server
9758             (list 'gnus-request-accept-article
9759                   to-newsgroup (list 'quote select-method)
9760                   (not articles) t)     ; Accept form
9761             (not articles)              ; Only save nov last time
9762             (and move-is-internal
9763                  to-newsgroup           ; Not respooling
9764                                         ; Is this move internal?
9765                  (gnus-group-real-name to-newsgroup)))))
9766         ;; Copy the article.
9767         ((eq action 'copy)
9768          (with-current-buffer copy-buf
9769            (when (gnus-request-article-this-buffer article
9770                                                    gnus-newsgroup-name)
9771              (save-restriction
9772                (nnheader-narrow-to-headers)
9773                (dolist (hdr gnus-copy-article-ignored-headers)
9774                  (message-remove-header hdr t)))
9775              (gnus-request-accept-article
9776               to-newsgroup select-method (not articles) t))))
9777         ;; Crosspost the article.
9778         ((eq action 'crosspost)
9779          (let ((xref (message-tokenize-header
9780                       (mail-header-xref (gnus-summary-article-header
9781                                          article))
9782                       " ")))
9783            (setq new-xref (concat (gnus-group-real-name gnus-newsgroup-name)
9784                                   ":" (number-to-string article)))
9785            (unless xref
9786              (setq xref (list (system-name))))
9787            (setq new-xref
9788                  (concat
9789                   (mapconcat 'identity
9790                              (delete "Xref:" (delete new-xref xref))
9791                              " ")
9792                   " " new-xref))
9793            (with-current-buffer copy-buf
9794              ;; First put the article in the destination group.
9795              (gnus-request-article-this-buffer article gnus-newsgroup-name)
9796              (when (consp (setq art-group
9797                                 (gnus-request-accept-article
9798                                  to-newsgroup select-method (not articles)
9799                                  t)))
9800                (setq new-xref (concat new-xref " " (car art-group)
9801                                       ":"
9802                                       (number-to-string (cdr art-group))))
9803                ;; Now we have the new Xrefs header, so we insert
9804                ;; it and replace the new article.
9805                (nnheader-replace-header "Xref" new-xref)
9806                (gnus-request-replace-article
9807                 (cdr art-group) to-newsgroup (current-buffer) t)
9808                art-group))))))
9809       (cond
9810        ((not art-group)
9811         (gnus-message 1 "Couldn't %s article %s: %s"
9812                       (cadr (assq action names)) article
9813                       (nnheader-get-report (car to-method))))
9814        ((eq art-group 'junk)
9815         (when (eq action 'move)
9816           (gnus-summary-mark-article article gnus-canceled-mark)
9817           (gnus-message 4 "Deleted article %s" article)
9818           ;; run the delete hook
9819           (run-hook-with-args 'gnus-summary-article-delete-hook
9820                               action
9821                               (gnus-data-header
9822                                (assoc article (gnus-data-list nil)))
9823                               gnus-newsgroup-name nil
9824                               select-method)))
9825        (t
9826         (let* ((pto-group (gnus-group-prefixed-name
9827                            (car art-group) to-method))
9828                (info (gnus-get-info pto-group))
9829                (to-group (gnus-info-group info))
9830                to-marks)
9831           ;; Update the group that has been moved to.
9832           (when (and info
9833                      (memq action '(move copy)))
9834             (unless (member to-group to-groups)
9835               (push to-group to-groups))
9836
9837             (when (and (not (memq article gnus-newsgroup-unreads))
9838                        (cdr art-group))
9839               (push 'read to-marks)
9840               (gnus-info-set-read
9841                info (gnus-add-to-range (gnus-info-read info)
9842                                        (list (cdr art-group)))))
9843
9844             ;; See whether the article is to be put in the cache.
9845             (let* ((expirable (gnus-group-auto-expirable-p to-group))
9846                    (marks (if expirable
9847                               gnus-article-mark-lists
9848                             (delete '(expirable . expire)
9849                                     (copy-sequence
9850                                      gnus-article-mark-lists))))
9851                    (to-article (cdr art-group)))
9852
9853               ;; Enter the article into the cache in the new group,
9854               ;; if that is required.
9855               (when (and to-article
9856                          gnus-use-cache)
9857                 (gnus-cache-possibly-enter-article
9858                  to-group to-article
9859                  (memq article gnus-newsgroup-marked)
9860                  (memq article gnus-newsgroup-dormant)
9861                  (memq article gnus-newsgroup-unreads)))
9862
9863               (when (and gnus-preserve-marks
9864                          to-article)
9865                 ;; Copy any marks over to the new group.
9866                 (when (and (equal to-group gnus-newsgroup-name)
9867                            (not (memq article gnus-newsgroup-unreads)))
9868                   ;; Mark this article as read in this group.
9869                   (push (cons to-article gnus-read-mark)
9870                         gnus-newsgroup-reads)
9871                   ;; Increase the active status of this group.
9872                   (setcdr (gnus-active to-group) to-article)
9873                   (setcdr gnus-newsgroup-active to-article))
9874
9875                 (while marks
9876                   (when (eq (gnus-article-mark-to-type (cdar marks)) 'list)
9877                     (when (memq article (symbol-value
9878                                          (intern (format "gnus-newsgroup-%s"
9879                                                          (caar marks)))))
9880                       (push (cdar marks) to-marks)
9881                       ;; If the other group is the same as this group,
9882                       ;; then we have to add the mark to the list.
9883                       (when (equal to-group gnus-newsgroup-name)
9884                         (set (intern (format "gnus-newsgroup-%s"
9885                                              (caar marks)))
9886                              (cons to-article
9887                                    (symbol-value
9888                                     (intern (format "gnus-newsgroup-%s"
9889                                                     (caar marks)))))))
9890                       ;; Copy the marks to other group.
9891                       (gnus-add-marked-articles
9892                        to-group (cdar marks) (list to-article) info)))
9893                   (setq marks (cdr marks)))
9894
9895                 (when (and expirable
9896                            gnus-mark-copied-or-moved-articles-as-expirable
9897                            (not (memq 'expire to-marks)))
9898                   ;; Mark this article as expirable.
9899                   (push 'expire to-marks)
9900                   (when (equal to-group gnus-newsgroup-name)
9901                     (push to-article gnus-newsgroup-expirable))
9902                   ;; Copy the expirable mark to other group.
9903                   (gnus-add-marked-articles
9904                    to-group 'expire (list to-article) info))
9905
9906                 (when to-marks
9907                   (gnus-request-set-mark
9908                    to-group (list (list (list to-article) 'add to-marks)))))
9909
9910               (gnus-dribble-enter
9911                (concat "(gnus-group-set-info '"
9912                        (gnus-prin1-to-string (gnus-get-info to-group))
9913                        ")"))))
9914
9915           ;; Update the Xref header in this article to point to
9916           ;; the new crossposted article we have just created.
9917           (when (eq action 'crosspost)
9918             (with-current-buffer copy-buf
9919               (gnus-request-article-this-buffer article gnus-newsgroup-name)
9920               (nnheader-replace-header "Xref" new-xref)
9921               (gnus-request-replace-article
9922                article gnus-newsgroup-name (current-buffer) t)))
9923
9924           ;; run the move/copy/crosspost/respool hook
9925           (run-hook-with-args 'gnus-summary-article-move-hook
9926                               action
9927                               (gnus-data-header
9928                                (assoc article (gnus-data-list nil)))
9929                               gnus-newsgroup-name
9930                               to-newsgroup
9931                               select-method))
9932
9933         ;;;!!!Why is this necessary?
9934         (set-buffer gnus-summary-buffer)
9935
9936         (when (eq action 'move)
9937           (save-excursion
9938             (gnus-summary-goto-subject article)
9939             (gnus-summary-mark-article article gnus-canceled-mark)))))
9940       (push article articles-to-update-marks))
9941
9942     (save-excursion
9943       (apply 'gnus-summary-remove-process-mark articles-to-update-marks))
9944     ;; Re-activate all groups that have been moved to.
9945     (with-current-buffer gnus-group-buffer
9946       (let ((gnus-group-marked to-groups))
9947         (gnus-group-get-new-news-this-group nil t)))
9948
9949     (gnus-kill-buffer copy-buf)
9950     (gnus-summary-position-point)
9951     (gnus-set-mode-line 'summary)))
9952
9953 (defun gnus-summary-push-marks-to-backend (article)
9954   (let ((set nil)
9955         (marks gnus-article-mark-lists))
9956     (unless (memq article gnus-newsgroup-unreads)
9957       (push 'read set))
9958     (while marks
9959       (when (and (eq (gnus-article-mark-to-type (cdar marks)) 'list)
9960                  (memq article (symbol-value
9961                                 (intern (format "gnus-newsgroup-%s"
9962                                                 (caar marks))))))
9963         (push (cdar marks) set))
9964       (pop marks))
9965     (gnus-request-set-mark gnus-newsgroup-name `(((,article) set ,set)))))
9966
9967 (defun gnus-summary-copy-article (&optional n to-newsgroup select-method)
9968   "Copy the current article to some other group.
9969 If TO-NEWSGROUP is string, do not prompt for a newsgroup to copy to.
9970 When called interactively, if TO-NEWSGROUP is nil, use the value of
9971 the variable `gnus-move-split-methods' for finding a default target
9972 newsgroup.
9973 If SELECT-METHOD is non-nil, do not move to a specific newsgroup, but
9974 re-spool using this method."
9975   (interactive "P")
9976   (gnus-summary-move-article n to-newsgroup select-method 'copy))
9977
9978 (defun gnus-summary-crosspost-article (&optional n)
9979   "Crosspost the current article to some other group."
9980   (interactive "P")
9981   (gnus-summary-move-article n nil nil 'crosspost))
9982
9983 (defcustom gnus-summary-respool-default-method nil
9984   "Default method type for respooling an article.
9985 If nil, use to the current newsgroup method."
9986   :type 'symbol
9987   :group 'gnus-summary-mail)
9988
9989 (defun gnus-summary-respool-article (&optional n method)
9990   "Respool the current article.
9991 The article will be squeezed through the mail spooling process again,
9992 which means that it will be put in some mail newsgroup or other
9993 depending on `nnmail-split-methods'.
9994 If N is a positive number, respool the N next articles.
9995 If N is a negative number, respool the N previous articles.
9996 If N is nil and any articles have been marked with the process mark,
9997 respool those articles instead.
9998
9999 Respooling can be done both from mail groups and \"real\" newsgroups.
10000 In the former case, the articles in question will be moved from the
10001 current group into whatever groups they are destined to.  In the
10002 latter case, they will be copied into the relevant groups."
10003   (interactive
10004    (list current-prefix-arg
10005          (let* ((methods (mapcar #'car (gnus-methods-using 'respool)))
10006                 (methname
10007                  (symbol-name (or gnus-summary-respool-default-method
10008                                   (car (gnus-find-method-for-group
10009                                         gnus-newsgroup-name)))))
10010                 (method
10011                  (gnus-completing-read
10012                   "Backend to use when respooling"
10013                   methods t nil 'gnus-mail-method-history methname))
10014                 ms)
10015            (cond
10016             ((zerop (length (setq ms (gnus-servers-using-backend
10017                                       (intern method)))))
10018              (list (intern method) ""))
10019             ((= 1 (length ms))
10020              (car ms))
10021             (t
10022              (let ((ms-alist (mapcar (lambda (m) (cons (cadr m) m)) ms)))
10023                (cdr (assoc (gnus-completing-read "Server name" ms-alist t)
10024                            ms-alist))))))))
10025   (unless method
10026     (error "No method given for respooling"))
10027   (if (assoc (symbol-name
10028               (car (gnus-find-method-for-group gnus-newsgroup-name)))
10029              (gnus-methods-using 'respool))
10030       (gnus-summary-move-article n nil method)
10031     (gnus-summary-copy-article n nil method)))
10032
10033 (defun gnus-summary-import-article (file &optional edit)
10034   "Import an arbitrary file into a mail newsgroup."
10035   (interactive "fImport file: \nP")
10036   (let ((group gnus-newsgroup-name)
10037         (now (current-time))
10038         atts lines group-art)
10039     (unless (gnus-check-backend-function 'request-accept-article group)
10040       (error "%s does not support article importing" group))
10041     (or (file-readable-p file)
10042         (not (file-regular-p file))
10043         (error "Can't read %s" file))
10044     (with-current-buffer (gnus-get-buffer-create " *import file*")
10045       (erase-buffer)
10046       (nnheader-insert-file-contents file)
10047       (goto-char (point-min))
10048       (if (nnheader-article-p)
10049           (save-restriction
10050             (goto-char (point-min))
10051             (search-forward "\n\n" nil t)
10052             (narrow-to-region (point-min) (1- (point)))
10053             (goto-char (point-min))
10054             (unless (re-search-forward "^date:" nil t)
10055               (goto-char (point-max))
10056               (insert "Date: " (message-make-date (nth 5 atts)) "\n")))
10057        ;; This doesn't look like an article, so we fudge some headers.
10058         (setq atts (file-attributes file)
10059               lines (count-lines (point-min) (point-max)))
10060         (insert "From: " (read-string "From: ") "\n"
10061                 "Subject: " (read-string "Subject: ") "\n"
10062                 "Date: " (message-make-date (nth 5 atts)) "\n"
10063                 "Message-ID: " (message-make-message-id) "\n"
10064                 "Lines: " (int-to-string lines) "\n"
10065                 "Chars: " (int-to-string (nth 7 atts)) "\n\n"))
10066       (setq group-art (gnus-request-accept-article group nil t))
10067       (kill-buffer (current-buffer)))
10068     (setq gnus-newsgroup-active (gnus-activate-group group))
10069     (forward-line 1)
10070     (gnus-summary-goto-article (cdr group-art) nil t)
10071     (when edit
10072       (gnus-summary-edit-article))))
10073
10074 (defun gnus-summary-create-article ()
10075   "Create an article in a mail newsgroup."
10076   (interactive)
10077   (let ((group gnus-newsgroup-name)
10078         (now (current-time))
10079         group-art)
10080     (unless (gnus-check-backend-function 'request-accept-article group)
10081       (error "%s does not support article importing" group))
10082     (with-current-buffer (gnus-get-buffer-create " *import file*")
10083       (erase-buffer)
10084       (goto-char (point-min))
10085       ;; This doesn't look like an article, so we fudge some headers.
10086       (insert "From: " (read-string "From: ") "\n"
10087               "Subject: " (read-string "Subject: ") "\n"
10088               "Date: " (message-make-date now) "\n"
10089               "Message-ID: " (message-make-message-id) "\n")
10090       (setq group-art (gnus-request-accept-article group nil t))
10091       (kill-buffer (current-buffer)))
10092     (setq gnus-newsgroup-active (gnus-activate-group group))
10093     (forward-line 1)
10094     (gnus-summary-goto-article (cdr group-art) nil t)
10095     (gnus-summary-edit-article)))
10096
10097 (defun gnus-summary-article-posted-p ()
10098   "Say whether the current (mail) article is available from news as well.
10099 This will be the case if the article has both been mailed and posted."
10100   (interactive)
10101   (let ((id (mail-header-references (gnus-summary-article-header)))
10102         (gnus-override-method (car (gnus-refer-article-methods))))
10103     (if (gnus-request-head id "")
10104         (gnus-message 2 "The current message was found on %s"
10105                       gnus-override-method)
10106       (gnus-message 2 "The current message couldn't be found on %s"
10107                     gnus-override-method)
10108       nil)))
10109
10110 (defun gnus-summary-expire-articles (&optional now)
10111   "Expire all articles that are marked as expirable in the current group."
10112   (interactive)
10113   (when (and (not gnus-group-is-exiting-without-update-p)
10114              (gnus-check-backend-function
10115               'request-expire-articles gnus-newsgroup-name))
10116     ;; This backend supports expiry.
10117     (let* ((total (gnus-group-total-expirable-p gnus-newsgroup-name))
10118            (expirable (if total
10119                           (progn
10120                             ;; We need to update the info for
10121                             ;; this group for `gnus-list-of-read-articles'
10122                             ;; to give us the right answer.
10123                             (gnus-run-hooks 'gnus-exit-group-hook)
10124                             (gnus-summary-update-info)
10125                             (gnus-list-of-read-articles gnus-newsgroup-name))
10126                         (setq gnus-newsgroup-expirable
10127                               (sort gnus-newsgroup-expirable '<))))
10128            (expiry-wait (if now 'immediate
10129                           (gnus-group-find-parameter
10130                            gnus-newsgroup-name 'expiry-wait)))
10131            (nnmail-expiry-target
10132             (or (gnus-group-find-parameter gnus-newsgroup-name 'expiry-target)
10133                 nnmail-expiry-target))
10134            es)
10135       (when expirable
10136         ;; There are expirable articles in this group, so we run them
10137         ;; through the expiry process.
10138         (gnus-message 6 "Expiring articles...")
10139         (unless (gnus-check-group gnus-newsgroup-name)
10140           (error "Can't open server for %s" gnus-newsgroup-name))
10141         ;; The list of articles that weren't expired is returned.
10142         (save-excursion
10143           (if expiry-wait
10144               (let ((nnmail-expiry-wait-function nil)
10145                     (nnmail-expiry-wait expiry-wait))
10146                 (setq es (gnus-request-expire-articles
10147                           expirable gnus-newsgroup-name)))
10148             (setq es (gnus-request-expire-articles
10149                       expirable gnus-newsgroup-name)))
10150           (unless total
10151             (setq gnus-newsgroup-expirable es))
10152           ;; We go through the old list of expirable, and mark all
10153           ;; really expired articles as nonexistent.
10154           (unless (eq es expirable) ;If nothing was expired, we don't mark.
10155             (let ((gnus-use-cache nil))
10156               (dolist (article expirable)
10157                 (when (and (not (memq article es))
10158                            (gnus-data-find article))
10159                   (gnus-summary-mark-article article gnus-canceled-mark)
10160                   (run-hook-with-args 'gnus-summary-article-expire-hook
10161                                       'delete
10162                                       (gnus-data-header
10163                                        (assoc article (gnus-data-list nil)))
10164                                       gnus-newsgroup-name
10165                                       nil
10166                                       nil))))))
10167         (gnus-message 6 "Expiring articles...done")))))
10168
10169 (defun gnus-summary-expire-articles-now ()
10170   "Expunge all expirable articles in the current group.
10171 This means that *all* articles that are marked as expirable will be
10172 deleted forever, right now."
10173   (interactive)
10174   (or gnus-expert-user
10175       (gnus-yes-or-no-p
10176        "Are you really, really sure you want to delete all expirable messages? ")
10177       (error "Phew!"))
10178   (gnus-summary-expire-articles t))
10179
10180 ;; Suggested by Jack Vinson <vinson@unagi.cis.upenn.edu>.
10181 (defun gnus-summary-delete-article (&optional n)
10182   "Delete the N next (mail) articles.
10183 This command actually deletes articles.  This is not a marking
10184 command.  The article will disappear forever from your life, never to
10185 return.
10186
10187 If N is negative, delete backwards.
10188 If N is nil and articles have been marked with the process mark,
10189 delete these instead.
10190
10191 If `gnus-novice-user' is non-nil you will be asked for
10192 confirmation before the articles are deleted."
10193   (interactive "P")
10194   (unless (gnus-check-backend-function 'request-expire-articles
10195                                        gnus-newsgroup-name)
10196     (error "The current newsgroup does not support article deletion"))
10197   (unless (gnus-check-server (gnus-find-method-for-group gnus-newsgroup-name))
10198     (error "Couldn't open server"))
10199   ;; Compute the list of articles to delete.
10200   (let ((articles (sort (copy-sequence (gnus-summary-work-articles n)) '<))
10201         (nnmail-expiry-target 'delete)
10202         not-deleted)
10203     (if (and gnus-novice-user
10204              (not (gnus-yes-or-no-p
10205                    (format "Do you really want to delete %s forever? "
10206                            (if (> (length articles) 1)
10207                                (format "these %s articles" (length articles))
10208                              "this article")))))
10209         ()
10210       ;; Delete the articles.
10211       (setq not-deleted (gnus-request-expire-articles
10212                          articles gnus-newsgroup-name 'force))
10213       (save-excursion
10214         (while articles
10215           (gnus-summary-remove-process-mark (car articles))
10216           ;; The backend might not have been able to delete the article
10217           ;; after all.
10218           (unless (memq (car articles) not-deleted)
10219             (gnus-summary-mark-article (car articles) gnus-canceled-mark)
10220             (let* ((article (car articles))
10221                    (ghead  (gnus-data-header
10222                             (assoc article (gnus-data-list nil)))))
10223               (run-hook-with-args 'gnus-summary-article-delete-hook
10224                                   'delete ghead gnus-newsgroup-name nil
10225                                   nil)))
10226           (setq articles (cdr articles))))
10227       (when not-deleted
10228         (gnus-message 4 "Couldn't delete articles %s" not-deleted)))
10229     (gnus-summary-position-point)
10230     (gnus-set-mode-line 'summary)
10231     not-deleted))
10232
10233 (defun gnus-summary-edit-article (&optional arg)
10234   "Edit the current article.
10235 This will have permanent effect only in mail groups.
10236 If ARG is nil, edit the decoded articles.
10237 If ARG is 1, edit the raw articles.
10238 If ARG is 2, edit the raw articles even in read-only groups.
10239 If ARG is 3, edit the articles with the current handles.
10240 Otherwise, allow editing of articles even in read-only
10241 groups."
10242   (interactive "P")
10243   (let (force raw current-handles)
10244     (cond
10245      ((null arg))
10246      ((eq arg 1)
10247       (setq raw t))
10248      ((eq arg 2)
10249       (setq raw t
10250             force t))
10251      ((eq arg 3)
10252       (setq current-handles
10253             (and (gnus-buffer-live-p gnus-article-buffer)
10254                  (with-current-buffer gnus-article-buffer
10255                    (prog1
10256                        gnus-article-mime-handles
10257                      (setq gnus-article-mime-handles nil))))))
10258      (t
10259       (setq force t)))
10260     (when (and raw (not force)
10261                (member gnus-newsgroup-name '("nndraft:delayed"
10262                                              "nndraft:drafts"
10263                                              "nndraft:queue")))
10264       (error "Can't edit the raw article in group %s"
10265              gnus-newsgroup-name))
10266     (with-current-buffer gnus-summary-buffer
10267       (let ((mail-parse-charset gnus-newsgroup-charset)
10268             (mail-parse-ignored-charsets gnus-newsgroup-ignored-charsets))
10269         (gnus-set-global-variables)
10270         (when (and (not force)
10271                    (gnus-group-read-only-p))
10272           (error "The current newsgroup does not support article editing"))
10273         (gnus-summary-show-article t)
10274         (when (and (not raw) (gnus-buffer-live-p gnus-article-buffer))
10275           (with-current-buffer gnus-article-buffer
10276             (mm-enable-multibyte)))
10277         (if (member gnus-newsgroup-name '("nndraft:delayed" "nndraft:drafts"))
10278             (setq raw t))
10279         (gnus-article-edit-article
10280          (if raw 'ignore
10281            `(lambda ()
10282               (let ((mbl mml-buffer-list))
10283                 (setq mml-buffer-list nil)
10284                 (let ((rfc2047-quote-decoded-words-containing-tspecials t))
10285                   (mime-to-mml ,'current-handles))
10286                 (let ((mbl1 mml-buffer-list))
10287                   (setq mml-buffer-list mbl)
10288                   (set (make-local-variable 'mml-buffer-list) mbl1))
10289                 (gnus-make-local-hook 'kill-buffer-hook)
10290                 (add-hook 'kill-buffer-hook 'mml-destroy-buffers t t))))
10291          `(lambda (no-highlight)
10292             (let ((mail-parse-charset ',gnus-newsgroup-charset)
10293                   (message-options message-options)
10294                   (message-options-set-recipient)
10295                   (mail-parse-ignored-charsets
10296                    ',gnus-newsgroup-ignored-charsets)
10297                   (rfc2047-header-encoding-alist
10298                    ',(let ((charset (gnus-group-name-charset
10299                                      (gnus-find-method-for-group
10300                                       gnus-newsgroup-name)
10301                                      gnus-newsgroup-name)))
10302                        (append (list (cons "Newsgroups" charset)
10303                                      (cons "Followup-To" charset)
10304                                      (cons "Xref" charset))
10305                                rfc2047-header-encoding-alist))))
10306               ,(if (not raw) '(progn
10307                                 (mml-to-mime)
10308                                 (mml-destroy-buffers)
10309                                 (remove-hook 'kill-buffer-hook
10310                                              'mml-destroy-buffers t)
10311                                 (kill-local-variable 'mml-buffer-list)))
10312               (gnus-summary-edit-article-done
10313                ,(or (mail-header-references gnus-current-headers) "")
10314                ,(gnus-group-read-only-p)
10315                ,gnus-summary-buffer no-highlight))))))))
10316
10317 (defalias 'gnus-summary-edit-article-postpone 'gnus-article-edit-exit)
10318
10319 (defun gnus-summary-edit-article-done (&optional references read-only buffer
10320                                                  no-highlight)
10321   "Make edits to the current article permanent."
10322   (interactive)
10323   (save-excursion
10324     ;; The buffer restriction contains the entire article if it exists.
10325     (when (article-goto-body)
10326       (let ((lines (count-lines (point) (point-max)))
10327             (length (- (point-max) (point)))
10328             (case-fold-search t)
10329             (body (copy-marker (point))))
10330         (goto-char (point-min))
10331         (when (re-search-forward "^content-length:[ \t]\\([0-9]+\\)" body t)
10332           (delete-region (match-beginning 1) (match-end 1))
10333           (insert (number-to-string length)))
10334         (goto-char (point-min))
10335         (when (re-search-forward
10336                "^x-content-length:[ \t]\\([0-9]+\\)" body t)
10337           (delete-region (match-beginning 1) (match-end 1))
10338           (insert (number-to-string length)))
10339         (goto-char (point-min))
10340         (when (re-search-forward "^lines:[ \t]\\([0-9]+\\)" body t)
10341           (delete-region (match-beginning 1) (match-end 1))
10342           (insert (number-to-string lines))))))
10343   ;; Replace the article.
10344   (let ((buf (current-buffer))
10345         (article (cdr gnus-article-current))
10346         replace-result)
10347     (with-temp-buffer
10348       (insert-buffer-substring buf)
10349       (if (and (not read-only)
10350                (not (setq replace-result
10351                           (gnus-request-replace-article
10352                            article (car gnus-article-current)
10353                            (current-buffer) t))))
10354           (error "Couldn't replace article")
10355         ;; If we got a number back, then that's the new article number
10356         ;; for this article.  Otherwise, the article number didn't change.
10357         (when (numberp replace-result)
10358           (with-current-buffer gnus-summary-buffer
10359             (setq gnus-newsgroup-limit (delq article gnus-newsgroup-limit))
10360             (gnus-summary-limit gnus-newsgroup-limit)
10361             (setq article replace-result)
10362             (gnus-summary-goto-subject article t)))
10363         ;; Update the summary buffer.
10364         (if (and references
10365                  (equal (message-tokenize-header references " ")
10366                         (message-tokenize-header
10367                          (or (message-fetch-field "references") "") " ")))
10368             ;; We only have to update this line.
10369             (save-excursion
10370               (save-restriction
10371                 (message-narrow-to-head)
10372                 (let ((head (buffer-substring-no-properties
10373                              (point-min) (point-max)))
10374                       header)
10375                   (with-temp-buffer
10376                     (insert (format "211 %d Article retrieved.\n" article))
10377                     (insert head)
10378                     (insert ".\n")
10379                     (let ((nntp-server-buffer (current-buffer)))
10380                       (setq header (car (gnus-get-newsgroup-headers nil t))))
10381                     (with-current-buffer gnus-summary-buffer
10382                       (gnus-data-set-header (gnus-data-find article) header)
10383                       (gnus-summary-update-article-line article header)
10384                       (if (gnus-summary-goto-subject article nil t)
10385                           (gnus-summary-update-secondary-mark article)))))))
10386           ;; Update threads.
10387           (set-buffer (or buffer gnus-summary-buffer))
10388           (gnus-summary-update-article article)
10389           (if (gnus-summary-goto-subject article nil t)
10390               (gnus-summary-update-secondary-mark article)))
10391         ;; Prettify the article buffer again.
10392         (unless no-highlight
10393           (with-current-buffer gnus-article-buffer
10394             ;;!!! Fix this -- article should be rehighlighted.
10395             ;;(gnus-run-hooks 'gnus-article-display-hook)
10396             (set-buffer gnus-original-article-buffer)
10397             (gnus-request-article
10398              article (car gnus-article-current) (current-buffer))))
10399         ;; Prettify the summary buffer line.
10400         (when (gnus-visual-p 'summary-highlight 'highlight)
10401           (gnus-run-hooks 'gnus-visual-mark-article-hook))))))
10402
10403 (defun gnus-summary-edit-wash (key)
10404   "Perform editing command KEY in the article buffer."
10405   (interactive
10406    (list
10407     (progn
10408       (message "%s" (concat (this-command-keys) "- "))
10409       (read-char))))
10410   (message "")
10411   (gnus-summary-edit-article)
10412   (execute-kbd-macro (concat (this-command-keys) key))
10413   (gnus-article-edit-done))
10414
10415 ;;; Respooling
10416
10417 (defun gnus-summary-respool-query (&optional silent trace)
10418   "Query where the respool algorithm would put this article."
10419   (interactive)
10420   (let (gnus-mark-article-hook)
10421     (gnus-summary-select-article)
10422     (with-current-buffer gnus-original-article-buffer
10423       (let ((groups (nnmail-article-group 'identity trace)))
10424         (unless silent
10425           (if groups
10426               (message "This message would go to %s"
10427                        (mapconcat 'car groups ", "))
10428             (message "This message would go to no groups"))
10429           groups)))))
10430
10431 (defun gnus-summary-respool-trace ()
10432   "Trace where the respool algorithm would put this article.
10433 Display a buffer showing all fancy splitting patterns which matched."
10434   (interactive)
10435   (gnus-summary-respool-query nil t))
10436
10437 ;; Summary marking commands.
10438
10439 (defun gnus-summary-kill-same-subject-and-select (&optional unmark)
10440   "Mark articles which has the same subject as read, and then select the next.
10441 If UNMARK is positive, remove any kind of mark.
10442 If UNMARK is negative, tick articles."
10443   (interactive "P")
10444   (when unmark
10445     (setq unmark (prefix-numeric-value unmark)))
10446   (let ((count
10447          (gnus-summary-mark-same-subject
10448           (gnus-summary-article-subject) unmark)))
10449     ;; Select next unread article.  If auto-select-same mode, should
10450     ;; select the first unread article.
10451     (gnus-summary-next-article t (and gnus-auto-select-same
10452                                       (gnus-summary-article-subject)))
10453     (gnus-message 7 "%d article%s marked as %s"
10454                   count (if (= count 1) " is" "s are")
10455                   (if unmark "unread" "read"))))
10456
10457 (defun gnus-summary-kill-same-subject (&optional unmark)
10458   "Mark articles which has the same subject as read.
10459 If UNMARK is positive, remove any kind of mark.
10460 If UNMARK is negative, tick articles."
10461   (interactive "P")
10462   (when unmark
10463     (setq unmark (prefix-numeric-value unmark)))
10464   (let ((count
10465          (gnus-summary-mark-same-subject
10466           (gnus-summary-article-subject) unmark)))
10467     ;; If marked as read, go to next unread subject.
10468     (when (null unmark)
10469       ;; Go to next unread subject.
10470       (gnus-summary-next-subject 1 t))
10471     (gnus-message 7 "%d articles are marked as %s"
10472                   count (if unmark "unread" "read"))))
10473
10474 (defun gnus-summary-mark-same-subject (subject &optional unmark)
10475   "Mark articles with same SUBJECT as read, and return marked number.
10476 If optional argument UNMARK is positive, remove any kinds of marks.
10477 If optional argument UNMARK is negative, mark articles as unread instead."
10478   (let ((count 1))
10479     (save-excursion
10480       (cond
10481        ((null unmark)                   ; Mark as read.
10482         (while (and
10483                 (progn
10484                   (gnus-summary-mark-article-as-read gnus-killed-mark)
10485                   (gnus-summary-show-thread) t)
10486                 (gnus-summary-find-subject subject))
10487           (setq count (1+ count))))
10488        ((> unmark 0)                    ; Tick.
10489         (while (and
10490                 (progn
10491                   (gnus-summary-mark-article-as-unread gnus-ticked-mark)
10492                   (gnus-summary-show-thread) t)
10493                 (gnus-summary-find-subject subject))
10494           (setq count (1+ count))))
10495        (t                               ; Mark as unread.
10496         (while (and
10497                 (progn
10498                   (gnus-summary-mark-article-as-unread gnus-unread-mark)
10499                   (gnus-summary-show-thread) t)
10500                 (gnus-summary-find-subject subject))
10501           (setq count (1+ count)))))
10502       (gnus-set-mode-line 'summary)
10503       ;; Return the number of marked articles.
10504       count)))
10505
10506 (defun gnus-summary-mark-as-processable (n &optional unmark)
10507   "Set the process mark on the next N articles.
10508 If N is negative, mark backward instead.  If UNMARK is non-nil, remove
10509 the process mark instead.  The difference between N and the actual
10510 number of articles marked is returned."
10511   (interactive "P")
10512   (if (and (null n) (gnus-region-active-p))
10513       (gnus-uu-mark-region (region-beginning) (region-end) unmark)
10514     (setq n (prefix-numeric-value n))
10515     (let ((backward (< n 0))
10516           (n (abs n)))
10517       (while (and
10518               (> n 0)
10519               (if unmark
10520                   (gnus-summary-remove-process-mark
10521                    (gnus-summary-article-number))
10522                 (gnus-summary-set-process-mark (gnus-summary-article-number)))
10523               (zerop (gnus-summary-next-subject (if backward -1 1) nil t)))
10524         (setq n (1- n)))
10525       (when (/= 0 n)
10526         (gnus-message 7 "No more articles"))
10527       (gnus-summary-recenter)
10528       (gnus-summary-position-point)
10529       n)))
10530
10531 (defun gnus-summary-unmark-as-processable (n)
10532   "Remove the process mark from the next N articles.
10533 If N is negative, unmark backward instead.  The difference between N and
10534 the actual number of articles unmarked is returned."
10535   (interactive "P")
10536   (gnus-summary-mark-as-processable n t))
10537
10538 (defun gnus-summary-unmark-all-processable ()
10539   "Remove the process mark from all articles."
10540   (interactive)
10541   (save-excursion
10542     (while gnus-newsgroup-processable
10543       (gnus-summary-remove-process-mark (car gnus-newsgroup-processable))))
10544   (gnus-summary-position-point))
10545
10546 (defun gnus-summary-add-mark (article type)
10547   "Mark ARTICLE with a mark of TYPE."
10548   (let ((vtype (car (assq type gnus-article-mark-lists)))
10549         var)
10550     (if (not vtype)
10551         (error "No such mark type: %s" type)
10552       (setq var (intern (format "gnus-newsgroup-%s" type)))
10553       (set var (cons article (symbol-value var)))
10554       (if (memq type '(processable cached replied forwarded recent saved))
10555           (gnus-summary-update-secondary-mark article)
10556         ;;; !!! This is bogus.  We should find out what primary
10557         ;;; !!! mark we want to set.
10558         (gnus-summary-update-mark gnus-del-mark 'unread)))))
10559
10560 (defun gnus-summary-mark-as-expirable (n)
10561   "Mark N articles forward as expirable.
10562 If N is negative, mark backward instead.  The difference between N and
10563 the actual number of articles marked is returned."
10564   (interactive "p")
10565   (gnus-summary-mark-forward n gnus-expirable-mark))
10566
10567 (defun gnus-summary-mark-as-spam (n)
10568   "Mark N articles forward as spam.
10569 If N is negative, mark backward instead.  The difference between N and
10570 the actual number of articles marked is returned."
10571   (interactive "p")
10572   (gnus-summary-mark-forward n gnus-spam-mark))
10573
10574 (defun gnus-summary-mark-article-as-replied (article)
10575   "Mark ARTICLE as replied to and update the summary line.
10576 ARTICLE can also be a list of articles."
10577   (interactive (list (gnus-summary-article-number)))
10578   (let ((articles (if (listp article) article (list article))))
10579     (dolist (article articles)
10580       (unless (numberp article)
10581         (error "%s is not a number" article))
10582       (push article gnus-newsgroup-replied)
10583       (let ((inhibit-read-only t))
10584         (when (gnus-summary-goto-subject article nil t)
10585           (gnus-summary-update-secondary-mark article))))))
10586
10587 (defun gnus-summary-mark-article-as-forwarded (article)
10588   "Mark ARTICLE as forwarded and update the summary line.
10589 ARTICLE can also be a list of articles."
10590   (let ((articles (if (listp article) article (list article))))
10591     (dolist (article articles)
10592       (push article gnus-newsgroup-forwarded)
10593       (let ((inhibit-read-only t))
10594         (when (gnus-summary-goto-subject article nil t)
10595           (gnus-summary-update-secondary-mark article))))))
10596
10597 (defun gnus-summary-set-bookmark (article)
10598   "Set a bookmark in current article."
10599   (interactive (list (gnus-summary-article-number)))
10600   (when (or (not (get-buffer gnus-article-buffer))
10601             (not gnus-current-article)
10602             (not gnus-article-current)
10603             (not (equal gnus-newsgroup-name (car gnus-article-current))))
10604     (error "No current article selected"))
10605   ;; Remove old bookmark, if one exists.
10606   (gnus-alist-pull article gnus-newsgroup-bookmarks)
10607   ;; Set the new bookmark, which is on the form
10608   ;; (article-number . line-number-in-body).
10609   (push
10610    (cons article
10611          (with-current-buffer gnus-article-buffer
10612            (count-lines
10613             (min (point)
10614                  (save-excursion
10615                    (article-goto-body)
10616                    (point)))
10617             (point))))
10618    gnus-newsgroup-bookmarks)
10619   (gnus-message 6 "A bookmark has been added to the current article."))
10620
10621 (defun gnus-summary-remove-bookmark (article)
10622   "Remove the bookmark from the current article."
10623   (interactive (list (gnus-summary-article-number)))
10624   ;; Remove old bookmark, if one exists.
10625   (if (not (assq article gnus-newsgroup-bookmarks))
10626       (gnus-message 6 "No bookmark in current article.")
10627     (gnus-alist-pull article gnus-newsgroup-bookmarks)
10628     (gnus-message 6 "Removed bookmark.")))
10629
10630 ;; Suggested by Daniel Quinlan <quinlan@best.com>.
10631 (defun gnus-summary-mark-as-dormant (n)
10632   "Mark N articles forward as dormant.
10633 If N is negative, mark backward instead.  The difference between N and
10634 the actual number of articles marked is returned."
10635   (interactive "p")
10636   (gnus-summary-mark-forward n gnus-dormant-mark))
10637
10638 (defun gnus-summary-set-process-mark (article)
10639   "Set the process mark on ARTICLE and update the summary line."
10640   (setq gnus-newsgroup-processable
10641         (cons article
10642               (delq article gnus-newsgroup-processable)))
10643   (when (gnus-summary-goto-subject article)
10644     (gnus-summary-show-thread)
10645     (gnus-summary-goto-subject article)
10646     (gnus-summary-update-secondary-mark article)))
10647
10648 (defun gnus-summary-remove-process-mark (&rest articles)
10649   "Remove the process mark from ARTICLES and update the summary line."
10650   (dolist (article articles)
10651     (setq gnus-newsgroup-processable (delq article gnus-newsgroup-processable))
10652     (when (gnus-summary-goto-subject article)
10653       (gnus-summary-show-thread)
10654       (gnus-summary-goto-subject article)
10655       (gnus-summary-update-secondary-mark article)))
10656   t)
10657
10658 (defun gnus-summary-set-saved-mark (article)
10659   "Set the process mark on ARTICLE and update the summary line."
10660   (push article gnus-newsgroup-saved)
10661   (when (gnus-summary-goto-subject article)
10662     (gnus-summary-update-secondary-mark article)))
10663
10664 (defun gnus-summary-mark-forward (n &optional mark no-expire)
10665   "Mark N articles as read forwards.
10666 If N is negative, mark backwards instead.  Mark with MARK, ?r by default.
10667 The difference between N and the actual number of articles marked is
10668 returned.
10669 If NO-EXPIRE, auto-expiry will be inhibited."
10670   (interactive "p")
10671   (gnus-summary-show-thread)
10672   (let ((backward (< n 0))
10673         (gnus-summary-goto-unread
10674          (and gnus-summary-goto-unread
10675               (not (eq gnus-summary-goto-unread 'never))
10676               (not (memq mark (list gnus-unread-mark gnus-spam-mark
10677                                     gnus-ticked-mark gnus-dormant-mark)))))
10678         (n (abs n))
10679         (mark (or mark gnus-del-mark)))
10680     (while (and (> n 0)
10681                 (gnus-summary-mark-article nil mark no-expire)
10682                 (zerop (gnus-summary-next-subject
10683                         (if backward -1 1)
10684                         (and gnus-summary-goto-unread
10685                              (not (eq gnus-summary-goto-unread 'never)))
10686                         t)))
10687       (setq n (1- n)))
10688     (when (/= 0 n)
10689       (gnus-message 7 "No more %sarticles" (if mark "" "unread ")))
10690     (gnus-summary-recenter)
10691     (gnus-summary-position-point)
10692     (gnus-set-mode-line 'summary)
10693     n))
10694
10695 (defun gnus-summary-mark-article-as-read (mark)
10696   "Mark the current article quickly as read with MARK."
10697   (let ((article (gnus-summary-article-number)))
10698     (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
10699     (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
10700     (setq gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked))
10701     (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
10702     (push (cons article mark) gnus-newsgroup-reads)
10703     ;; Possibly remove from cache, if that is used.
10704     (when gnus-use-cache
10705       (gnus-cache-enter-remove-article article))
10706     ;; Allow the backend to change the mark.
10707     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
10708     ;; Check for auto-expiry.
10709     (when (and gnus-newsgroup-auto-expire
10710                (memq mark gnus-auto-expirable-marks))
10711       (setq mark gnus-expirable-mark)
10712       ;; Let the backend know about the mark change.
10713       (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
10714       (push article gnus-newsgroup-expirable))
10715     ;; Set the mark in the buffer.
10716     (gnus-summary-update-mark mark 'unread)
10717     t))
10718
10719 (defun gnus-summary-mark-article-as-unread (mark)
10720   "Mark the current article quickly as unread with MARK."
10721   (let* ((article (gnus-summary-article-number))
10722          (old-mark (gnus-summary-article-mark article)))
10723     ;; Allow the backend to change the mark.
10724     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
10725     (if (eq mark old-mark)
10726         t
10727       (if (<= article 0)
10728           (progn
10729             (gnus-error 1 "Can't mark negative article numbers")
10730             nil)
10731         (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
10732         (setq gnus-newsgroup-spam-marked
10733               (delq article gnus-newsgroup-spam-marked))
10734         (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
10735         (setq gnus-newsgroup-expirable (delq article gnus-newsgroup-expirable))
10736         (setq gnus-newsgroup-reads (delq article gnus-newsgroup-reads))
10737         (cond ((= mark gnus-ticked-mark)
10738                (setq gnus-newsgroup-marked
10739                      (gnus-add-to-sorted-list gnus-newsgroup-marked
10740                                               article)))
10741               ((= mark gnus-spam-mark)
10742                (setq gnus-newsgroup-spam-marked
10743                      (gnus-add-to-sorted-list gnus-newsgroup-spam-marked
10744                                               article)))
10745               ((= mark gnus-dormant-mark)
10746                (setq gnus-newsgroup-dormant
10747                      (gnus-add-to-sorted-list gnus-newsgroup-dormant
10748                                               article)))
10749               (t
10750                (setq gnus-newsgroup-unreads
10751                      (gnus-add-to-sorted-list gnus-newsgroup-unreads
10752                                               article))))
10753         (gnus-alist-pull article gnus-newsgroup-reads)
10754
10755         ;; See whether the article is to be put in the cache.
10756         (and gnus-use-cache
10757              (vectorp (gnus-summary-article-header article))
10758              (save-excursion
10759                (gnus-cache-possibly-enter-article
10760                 gnus-newsgroup-name article
10761                 (= mark gnus-ticked-mark)
10762                 (= mark gnus-dormant-mark) (= mark gnus-unread-mark))))
10763
10764         ;; Fix the mark.
10765         (gnus-summary-update-mark mark 'unread)
10766         t))))
10767
10768 (defun gnus-summary-mark-article (&optional article mark no-expire)
10769   "Mark ARTICLE with MARK.  MARK can be any character.
10770 Four MARK strings are reserved: `? ' (unread), `?!' (ticked),
10771 `??' (dormant) and `?E' (expirable).
10772 If MARK is nil, then the default character `?r' is used.
10773 If ARTICLE is nil, then the article on the current line will be
10774 marked.
10775 If NO-EXPIRE, auto-expiry will be inhibited."
10776   ;; The mark might be a string.
10777   (when (stringp mark)
10778     (setq mark (aref mark 0)))
10779   ;; If no mark is given, then we check auto-expiring.
10780   (when (null mark)
10781     (setq mark gnus-del-mark))
10782   (when (and (not no-expire)
10783              gnus-newsgroup-auto-expire
10784              (memq mark gnus-auto-expirable-marks))
10785     (setq mark gnus-expirable-mark))
10786   (let ((article (or article (gnus-summary-article-number)))
10787         (old-mark (gnus-summary-article-mark article)))
10788     ;; Allow the backend to change the mark.
10789     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
10790     (if (eq mark old-mark)
10791         t
10792       (unless article
10793         (error "No article on current line"))
10794       (if (not (if (or (= mark gnus-unread-mark)
10795                        (= mark gnus-ticked-mark)
10796                        (= mark gnus-spam-mark)
10797                        (= mark gnus-dormant-mark))
10798                    (gnus-mark-article-as-unread article mark)
10799                  (gnus-mark-article-as-read article mark)))
10800           t
10801         ;; See whether the article is to be put in the cache.
10802         (and gnus-use-cache
10803              (not (= mark gnus-canceled-mark))
10804              (vectorp (gnus-summary-article-header article))
10805              (save-excursion
10806                (gnus-cache-possibly-enter-article
10807                 gnus-newsgroup-name article
10808                 (= mark gnus-ticked-mark)
10809                 (= mark gnus-dormant-mark) (= mark gnus-unread-mark))))
10810
10811         (when (gnus-summary-goto-subject article nil t)
10812           (let ((inhibit-read-only t))
10813             (gnus-summary-show-thread)
10814             ;; Fix the mark.
10815             (gnus-summary-update-mark mark 'unread)
10816             t))))))
10817
10818 (defun gnus-summary-update-secondary-mark (article)
10819   "Update the secondary (read, process, cache) mark."
10820   (gnus-summary-update-mark
10821    (cond ((memq article gnus-newsgroup-processable)
10822           gnus-process-mark)
10823          ((memq article gnus-newsgroup-cached)
10824           gnus-cached-mark)
10825          ((memq article gnus-newsgroup-replied)
10826           gnus-replied-mark)
10827          ((memq article gnus-newsgroup-forwarded)
10828           gnus-forwarded-mark)
10829          ((memq article gnus-newsgroup-saved)
10830           gnus-saved-mark)
10831          ((memq article gnus-newsgroup-recent)
10832           gnus-recent-mark)
10833          ((memq article gnus-newsgroup-unseen)
10834           gnus-unseen-mark)
10835          (t gnus-no-mark))
10836    'replied)
10837   (when (gnus-visual-p 'summary-highlight 'highlight)
10838     (gnus-summary-highlight-line)
10839     (gnus-run-hooks 'gnus-summary-update-hook))
10840   t)
10841
10842 (defun gnus-summary-update-download-mark (article)
10843   "Update the download mark."
10844   (gnus-summary-update-mark
10845    (cond ((memq article gnus-newsgroup-undownloaded)
10846           gnus-undownloaded-mark)
10847          (gnus-newsgroup-agentized
10848           gnus-downloaded-mark)
10849          (t
10850           gnus-no-mark))
10851    'download)
10852   (gnus-summary-update-line t)
10853   t)
10854
10855 (defun gnus-summary-update-mark (mark type)
10856   (let ((forward (cdr (assq type gnus-summary-mark-positions)))
10857         (inhibit-read-only t))
10858     (re-search-backward "[\n\r]" (point-at-bol) 'move-to-limit)
10859     (when forward
10860       (when (looking-at "\r")
10861         (incf forward))
10862       (when (<= (+ forward (point)) (point-max))
10863         ;; Go to the right position on the line.
10864         (goto-char (+ forward (point)))
10865         ;; Replace the old mark with the new mark.
10866         (let ((to-insert
10867                (mm-subst-char-in-string
10868                 (char-after) mark
10869                 (buffer-substring (point) (1+ (point))))))
10870           (delete-region (point) (1+ (point)))
10871           (insert to-insert))
10872         ;; Optionally update the marks by some user rule.
10873         (when (eq type 'unread)
10874           (gnus-data-set-mark
10875            (gnus-data-find (gnus-summary-article-number)) mark)
10876           (gnus-summary-update-line (eq mark gnus-unread-mark)))))))
10877
10878 (defun gnus-mark-article-as-read (article &optional mark)
10879   "Enter ARTICLE in the pertinent lists and remove it from others."
10880   ;; Make the article expirable.
10881   (let ((mark (or mark gnus-del-mark)))
10882     (setq gnus-newsgroup-expirable
10883           (if (= mark gnus-expirable-mark)
10884               (gnus-add-to-sorted-list gnus-newsgroup-expirable article)
10885             (delq article gnus-newsgroup-expirable)))
10886     ;; Remove from unread and marked lists.
10887     (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
10888     (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
10889     (setq gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked))
10890     (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
10891     (push (cons article mark) gnus-newsgroup-reads)
10892     ;; Possibly remove from cache, if that is used.
10893     (when gnus-use-cache
10894       (gnus-cache-enter-remove-article article))
10895     t))
10896
10897 (defun gnus-mark-article-as-unread (article &optional mark)
10898   "Enter ARTICLE in the pertinent lists and remove it from others."
10899   (let ((mark (or mark gnus-ticked-mark)))
10900     (if (<= article 0)
10901         (progn
10902           (gnus-error 1 "Can't mark negative article numbers")
10903           nil)
10904       (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked)
10905             gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked)
10906             gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant)
10907             gnus-newsgroup-expirable (delq article gnus-newsgroup-expirable)
10908             gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
10909
10910       ;; Unsuppress duplicates?
10911       (when gnus-suppress-duplicates
10912         (gnus-dup-unsuppress-article article))
10913
10914       (cond ((= mark gnus-ticked-mark)
10915              (setq gnus-newsgroup-marked
10916                    (gnus-add-to-sorted-list gnus-newsgroup-marked article)))
10917             ((= mark gnus-spam-mark)
10918              (setq gnus-newsgroup-spam-marked
10919                    (gnus-add-to-sorted-list gnus-newsgroup-spam-marked
10920                                             article)))
10921             ((= mark gnus-dormant-mark)
10922              (setq gnus-newsgroup-dormant
10923                    (gnus-add-to-sorted-list gnus-newsgroup-dormant article)))
10924             (t
10925              (setq gnus-newsgroup-unreads
10926                    (gnus-add-to-sorted-list gnus-newsgroup-unreads article))))
10927       (gnus-alist-pull article gnus-newsgroup-reads)
10928       t)))
10929
10930 (defun gnus-summary-tick-article-forward (n)
10931   "Tick N articles forwards.
10932 If N is negative, tick backwards instead.
10933 The difference between N and the number of articles ticked is returned."
10934   (interactive "p")
10935   (gnus-summary-mark-forward n gnus-ticked-mark))
10936
10937 (defun gnus-summary-tick-article-backward (n)
10938   "Tick N articles backwards.
10939 The difference between N and the number of articles ticked is returned."
10940   (interactive "p")
10941   (gnus-summary-mark-forward (- n) gnus-ticked-mark))
10942
10943 (defun gnus-summary-tick-article (&optional article clear-mark)
10944   "Mark current article as unread.
10945 Optional 1st argument ARTICLE specifies article number to be marked as unread.
10946 Optional 2nd argument CLEAR-MARK remove any kinds of mark."
10947   (interactive)
10948   (gnus-summary-mark-article article (if clear-mark gnus-unread-mark
10949                                        gnus-ticked-mark)))
10950
10951 (defun gnus-summary-mark-as-read-forward (n)
10952   "Mark N articles as read forwards.
10953 If N is negative, mark backwards instead.
10954 The difference between N and the actual number of articles marked is
10955 returned."
10956   (interactive "p")
10957   (gnus-summary-mark-forward n gnus-del-mark gnus-inhibit-user-auto-expire))
10958
10959 (defun gnus-summary-mark-as-read-backward (n)
10960   "Mark the N articles as read backwards.
10961 The difference between N and the actual number of articles marked is
10962 returned."
10963   (interactive "p")
10964   (gnus-summary-mark-forward
10965    (- n) gnus-del-mark gnus-inhibit-user-auto-expire))
10966
10967 (defun gnus-summary-mark-as-read (&optional article mark)
10968   "Mark current article as read.
10969 ARTICLE specifies the article to be marked as read.
10970 MARK specifies a string to be inserted at the beginning of the line."
10971   (gnus-summary-mark-article article mark))
10972
10973 (defun gnus-summary-clear-mark-forward (n)
10974   "Clear marks from N articles forward.
10975 If N is negative, clear backward instead.
10976 The difference between N and the number of marks cleared is returned."
10977   (interactive "p")
10978   (gnus-summary-mark-forward n gnus-unread-mark))
10979
10980 (defun gnus-summary-clear-mark-backward (n)
10981   "Clear marks from N articles backward.
10982 The difference between N and the number of marks cleared is returned."
10983   (interactive "p")
10984   (gnus-summary-mark-forward (- n) gnus-unread-mark))
10985
10986 (defun gnus-summary-mark-unread-as-read ()
10987   "Intended to be used by `gnus-mark-article-hook'."
10988   (when (memq gnus-current-article gnus-newsgroup-unreads)
10989     (gnus-summary-mark-article gnus-current-article gnus-read-mark)))
10990
10991 (defun gnus-summary-mark-read-and-unread-as-read (&optional new-mark)
10992   "Intended to be used by `gnus-mark-article-hook'."
10993   (let ((mark (gnus-summary-article-mark)))
10994     (when (or (gnus-unread-mark-p mark)
10995               (gnus-read-mark-p mark))
10996       (gnus-summary-mark-article gnus-current-article
10997                                  (or new-mark gnus-read-mark)))))
10998
10999 (defun gnus-summary-mark-current-read-and-unread-as-read (&optional new-mark)
11000   "Intended to be used by `gnus-mark-article-hook'."
11001   (let ((mark (gnus-summary-article-mark)))
11002     (when (or (gnus-unread-mark-p mark)
11003               (gnus-read-mark-p mark))
11004       (gnus-summary-mark-article (gnus-summary-article-number)
11005                                  (or new-mark gnus-read-mark)))))
11006
11007 (defun gnus-summary-mark-unread-as-ticked ()
11008   "Intended to be used by `gnus-mark-article-hook'."
11009   (when (memq gnus-current-article gnus-newsgroup-unreads)
11010     (gnus-summary-mark-article gnus-current-article gnus-ticked-mark)))
11011
11012 (defun gnus-summary-mark-region-as-read (point mark all)
11013   "Mark all unread articles between point and mark as read.
11014 If given a prefix, mark all articles between point and mark as read,
11015 even ticked and dormant ones."
11016   (interactive "r\nP")
11017   (save-excursion
11018     (let (article)
11019       (goto-char point)
11020       (beginning-of-line)
11021       (while (and
11022               (< (point) mark)
11023               (progn
11024                 (when (or all
11025                           (memq (setq article (gnus-summary-article-number))
11026                                 gnus-newsgroup-unreads))
11027                   (gnus-summary-mark-article article gnus-del-mark))
11028                 t)
11029               (gnus-summary-find-next))))))
11030
11031 (defun gnus-summary-mark-below (score mark)
11032   "Mark articles with score less than SCORE with MARK."
11033   (interactive "P\ncMark: ")
11034   (setq score (if score
11035                   (prefix-numeric-value score)
11036                 (or gnus-summary-default-score 0)))
11037   (with-current-buffer gnus-summary-buffer
11038     (goto-char (point-min))
11039     (while
11040         (progn
11041           (and (< (gnus-summary-article-score) score)
11042                (gnus-summary-mark-article nil mark))
11043           (gnus-summary-find-next)))))
11044
11045 (defun gnus-summary-kill-below (&optional score)
11046   "Mark articles with score below SCORE as read."
11047   (interactive "P")
11048   (gnus-summary-mark-below score gnus-killed-mark))
11049
11050 (defun gnus-summary-clear-above (&optional score)
11051   "Clear all marks from articles with score above SCORE."
11052   (interactive "P")
11053   (gnus-summary-mark-above score gnus-unread-mark))
11054
11055 (defun gnus-summary-tick-above (&optional score)
11056   "Tick all articles with score above SCORE."
11057   (interactive "P")
11058   (gnus-summary-mark-above score gnus-ticked-mark))
11059
11060 (defun gnus-summary-mark-above (score mark)
11061   "Mark articles with score over SCORE with MARK."
11062   (interactive "P\ncMark: ")
11063   (setq score (if score
11064                   (prefix-numeric-value score)
11065                 (or gnus-summary-default-score 0)))
11066   (with-current-buffer gnus-summary-buffer
11067     (goto-char (point-min))
11068     (while (and (progn
11069                   (when (> (gnus-summary-article-score) score)
11070                     (gnus-summary-mark-article nil mark))
11071                   t)
11072                 (gnus-summary-find-next)))))
11073
11074 ;; Suggested by Daniel Quinlan <quinlan@best.com>.
11075 (defalias 'gnus-summary-show-all-expunged 'gnus-summary-limit-include-expunged)
11076 (defun gnus-summary-limit-include-expunged (&optional no-error)
11077   "Display all the hidden articles that were expunged for low scores."
11078   (interactive)
11079   (let ((inhibit-read-only t))
11080     (let ((scored gnus-newsgroup-scored)
11081           headers h)
11082       (while scored
11083         (unless (gnus-summary-article-header (caar scored))
11084           (and (setq h (gnus-number-to-header (caar scored)))
11085                (< (cdar scored) gnus-summary-expunge-below)
11086                (push h headers)))
11087         (setq scored (cdr scored)))
11088       (if (not headers)
11089           (when (not no-error)
11090             (error "No expunged articles hidden"))
11091         (goto-char (point-min))
11092         (push gnus-newsgroup-limit gnus-newsgroup-limits)
11093         (setq gnus-newsgroup-limit (copy-sequence gnus-newsgroup-limit))
11094         (dolist (x headers)
11095           (push (mail-header-number x) gnus-newsgroup-limit))
11096         (gnus-summary-prepare-unthreaded (nreverse headers))
11097         (goto-char (point-min))
11098         (gnus-summary-position-point)
11099         t))))
11100
11101 (defun gnus-summary-catchup (&optional all quietly to-here not-mark reverse)
11102   "Mark all unread articles in this newsgroup as read.
11103 If prefix argument ALL is non-nil, ticked and dormant articles will
11104 also be marked as read.
11105 If QUIETLY is non-nil, no questions will be asked.
11106
11107 If TO-HERE is non-nil, it should be a point in the buffer.  All
11108 articles before (after, if REVERSE is set) this point will be marked
11109 as read.
11110
11111 Note that this function will only catch up the unread article
11112 in the current summary buffer limitation.
11113
11114 The number of articles marked as read is returned."
11115   (interactive "P")
11116   (prog1
11117       (save-excursion
11118         (when (or quietly
11119                   (not gnus-interactive-catchup) ;Without confirmation?
11120                   gnus-expert-user
11121                   (gnus-y-or-n-p
11122                    (if all
11123                        "Mark absolutely all articles as read? "
11124                      "Mark all unread articles as read? ")))
11125           (if (and not-mark
11126                    (not gnus-newsgroup-adaptive)
11127                    (not gnus-newsgroup-auto-expire)
11128                    (not gnus-suppress-duplicates)
11129                    (or (not gnus-use-cache)
11130                        (eq gnus-use-cache 'passive)))
11131               (progn
11132                 (when all
11133                   (setq gnus-newsgroup-marked nil
11134                         gnus-newsgroup-spam-marked nil
11135                         gnus-newsgroup-dormant nil))
11136                 (setq gnus-newsgroup-unreads
11137                       (gnus-sorted-nunion
11138                        (gnus-sorted-intersection gnus-newsgroup-unreads
11139                                                  gnus-newsgroup-downloadable)
11140                        (gnus-sorted-difference gnus-newsgroup-unfetched
11141                                                gnus-newsgroup-cached))))
11142             ;; We actually mark all articles as canceled, which we
11143             ;; have to do when using auto-expiry or adaptive scoring.
11144             (gnus-summary-show-all-threads)
11145             (if (and to-here reverse)
11146                 (progn
11147                   (goto-char to-here)
11148                   (gnus-summary-mark-current-read-and-unread-as-read
11149                    gnus-catchup-mark)
11150                   (while (gnus-summary-find-next (not all))
11151                     (gnus-summary-mark-article-as-read gnus-catchup-mark)))
11152               (when (gnus-summary-first-subject (not all))
11153                 (while (and
11154                         (if to-here (< (point) to-here) t)
11155                         (gnus-summary-mark-article-as-read gnus-catchup-mark)
11156                         (gnus-summary-find-next (not all))))))
11157             (gnus-set-mode-line 'summary))
11158           t))
11159     (gnus-summary-position-point)))
11160
11161 (defun gnus-summary-catchup-to-here (&optional all)
11162   "Mark all unticked articles before the current one as read.
11163 If ALL is non-nil, also mark ticked and dormant articles as read."
11164   (interactive "P")
11165   (save-excursion
11166     (gnus-save-hidden-threads
11167       (let ((beg (point)))
11168         ;; We check that there are unread articles.
11169         (when (or all (gnus-summary-find-prev))
11170           (gnus-summary-catchup all t beg)))))
11171   (gnus-summary-position-point))
11172
11173 (defun gnus-summary-catchup-from-here (&optional all)
11174   "Mark all unticked articles after (and including) the current one as read.
11175 If ALL is non-nil, also mark ticked and dormant articles as read."
11176   (interactive "P")
11177   (save-excursion
11178     (gnus-save-hidden-threads
11179       (let ((beg (point)))
11180         ;; We check that there are unread articles.
11181         (when (or all (gnus-summary-find-next))
11182           (gnus-summary-catchup all t beg nil t)))))
11183   (gnus-summary-position-point))
11184
11185 (defun gnus-summary-catchup-all (&optional quietly)
11186   "Mark all articles in this newsgroup as read.
11187 This command is dangerous.  Normally, you want \\[gnus-summary-catchup]
11188 instead, which marks only unread articles as read."
11189   (interactive "P")
11190   (gnus-summary-catchup t quietly))
11191
11192 (defun gnus-summary-catchup-and-exit (&optional all quietly)
11193   "Mark all unread articles in this group as read, then exit.
11194 If prefix argument ALL is non-nil, all articles are marked as read.
11195 If QUIETLY is non-nil, no questions will be asked."
11196   (interactive "P")
11197   (when (gnus-summary-catchup all quietly nil 'fast)
11198     ;; Select next newsgroup or exit.
11199     (if (and (not (gnus-group-quit-config gnus-newsgroup-name))
11200              (eq gnus-auto-select-next 'quietly))
11201         (gnus-summary-next-group nil)
11202       (gnus-summary-exit))))
11203
11204 (defun gnus-summary-catchup-all-and-exit (&optional quietly)
11205   "Mark all articles in this newsgroup as read, and then exit.
11206 This command is dangerous.  Normally, you want \\[gnus-summary-catchup-and-exit]
11207 instead, which marks only unread articles as read."
11208   (interactive "P")
11209   (gnus-summary-catchup-and-exit t quietly))
11210
11211 (defun gnus-summary-catchup-and-goto-next-group (&optional all)
11212   "Mark all articles in this group as read and select the next group.
11213 If given a prefix, mark all articles, unread as well as ticked, as
11214 read."
11215   (interactive "P")
11216   (save-excursion
11217     (gnus-summary-catchup all))
11218   (gnus-summary-next-group))
11219
11220 (defun gnus-summary-catchup-and-goto-prev-group (&optional all)
11221   "Mark all articles in this group as read and select the previous group.
11222 If given a prefix, mark all articles, unread as well as ticked, as
11223 read."
11224   (interactive "P")
11225   (save-excursion
11226     (gnus-summary-catchup all))
11227   (gnus-summary-next-group nil nil t))
11228
11229 ;;;
11230 ;;; with article
11231 ;;;
11232
11233 (defmacro gnus-with-article (article &rest forms)
11234   "Select ARTICLE and perform FORMS in the original article buffer.
11235 Then replace the article with the result."
11236   `(progn
11237      ;; We don't want the article to be marked as read.
11238      (let (gnus-mark-article-hook)
11239        (gnus-summary-select-article t t nil ,article))
11240      (set-buffer gnus-original-article-buffer)
11241      ,@forms
11242      (if (not (gnus-check-backend-function
11243                'request-replace-article (car gnus-article-current)))
11244          (gnus-message 5 "Read-only group; not replacing")
11245        (unless (gnus-request-replace-article
11246                 ,article (car gnus-article-current)
11247                 (current-buffer) t)
11248          (error "Couldn't replace article")))
11249      ;; The cache and backlog have to be flushed somewhat.
11250      (when gnus-keep-backlog
11251        (gnus-backlog-remove-article
11252         (car gnus-article-current) (cdr gnus-article-current)))
11253      (when gnus-use-cache
11254        (gnus-cache-update-article
11255         (car gnus-article-current) (cdr gnus-article-current)))))
11256
11257 (put 'gnus-with-article 'lisp-indent-function 1)
11258 (put 'gnus-with-article 'edebug-form-spec '(form body))
11259
11260 ;; Thread-based commands.
11261
11262 (defun gnus-summary-articles-in-thread (&optional article)
11263   "Return a list of all articles in the current thread.
11264 If ARTICLE is non-nil, return all articles in the thread that starts
11265 with that article."
11266   (let* ((article (or article (gnus-summary-article-number)))
11267          (data (gnus-data-find-list article))
11268          (top-level (gnus-data-level (car data)))
11269          (top-subject
11270           (cond ((null gnus-thread-operation-ignore-subject)
11271                  (gnus-simplify-subject-re
11272                   (mail-header-subject (gnus-data-header (car data)))))
11273                 ((eq gnus-thread-operation-ignore-subject 'fuzzy)
11274                  (gnus-simplify-subject-fuzzy
11275                   (mail-header-subject (gnus-data-header (car data)))))
11276                 (t nil)))
11277          (end-point (save-excursion
11278                       (goto-char (gnus-data-pos (car data)))
11279                       (if (gnus-summary-go-to-next-thread)
11280                           (point) (point-max))))
11281          articles)
11282     (while (and data
11283                 (< (gnus-data-pos (car data)) end-point))
11284       (when (or (not top-subject)
11285                 (string= top-subject
11286                          (if (eq gnus-thread-operation-ignore-subject 'fuzzy)
11287                              (gnus-simplify-subject-fuzzy
11288                               (mail-header-subject
11289                                (gnus-data-header (car data))))
11290                            (gnus-simplify-subject-re
11291                             (mail-header-subject
11292                              (gnus-data-header (car data)))))))
11293         (push (gnus-data-number (car data)) articles))
11294       (unless (and (setq data (cdr data))
11295                    (> (gnus-data-level (car data)) top-level))
11296         (setq data nil)))
11297     ;; Return the list of articles.
11298     (nreverse articles)))
11299
11300 (defun gnus-summary-rethread-current ()
11301   "Rethread the thread the current article is part of."
11302   (interactive)
11303   (let* ((gnus-show-threads t)
11304          (article (gnus-summary-article-number))
11305          (id (mail-header-id (gnus-summary-article-header)))
11306          (gnus-newsgroup-threads (list (gnus-id-to-thread (gnus-root-id id)))))
11307     (unless id
11308       (error "No article on the current line"))
11309     (gnus-rebuild-thread id)
11310     (gnus-summary-goto-subject article)))
11311
11312 (defun gnus-summary-reparent-thread ()
11313   "Make the current article child of the marked (or previous) article.
11314
11315 Note that the re-threading will only work if `gnus-thread-ignore-subject'
11316 is non-nil or the Subject: of both articles are the same."
11317   (interactive)
11318   (unless (not (gnus-group-read-only-p))
11319     (error "The current newsgroup does not support article editing"))
11320   (unless (<= (length gnus-newsgroup-processable) 1)
11321     (error "No more than one article may be marked"))
11322   (let ((child (gnus-summary-article-number))
11323         ;; First grab the marked article, otherwise one line up.
11324         (parent (if (not (null gnus-newsgroup-processable))
11325                     (car gnus-newsgroup-processable)
11326                   (save-excursion
11327                     (if (eq (forward-line -1) 0)
11328                         (gnus-summary-article-number)
11329                       (error "Beginning of summary buffer"))))))
11330     (gnus-summary-reparent-children parent (list child))))
11331
11332 (defun gnus-summary-reparent-children (parent children)
11333   "Make PARENT the parent of CHILDREN.
11334 When called interactively, PARENT is the current article and CHILDREN
11335 are the process-marked articles."
11336   (interactive
11337    (list (gnus-summary-article-number)
11338          (gnus-summary-work-articles nil)))
11339   (dolist (child children)
11340     (save-window-excursion
11341       (let ((gnus-article-buffer " *reparent*"))
11342         (unless (not (eq parent child))
11343           (error "An article may not be self-referential"))
11344         (let ((message-id (mail-header-id
11345                            (gnus-summary-article-header parent))))
11346           (unless (and message-id (not (equal message-id "")))
11347             (error "No message-id in desired parent"))
11348           (gnus-with-article child
11349             (save-restriction
11350               (goto-char (point-min))
11351               (message-narrow-to-head)
11352               (if (re-search-forward "^References: " nil t)
11353                   (progn
11354                     (re-search-forward "^[^ \t]" nil t)
11355                     (forward-line -1)
11356                     (end-of-line)
11357                     (insert " " message-id))
11358                 (insert "References: " message-id "\n"))))
11359           (set-buffer gnus-summary-buffer)
11360           (gnus-summary-unmark-all-processable)
11361           (gnus-summary-update-article child)
11362           (when (gnus-summary-goto-subject (cdr gnus-article-current) nil t)
11363             (gnus-summary-update-secondary-mark (cdr gnus-article-current)))
11364           (gnus-summary-rethread-current)
11365           (gnus-message 3 "Article %d is now the child of article %d"
11366                         child parent))))))
11367
11368 (defun gnus-summary-toggle-threads (&optional arg)
11369   "Toggle showing conversation threads.
11370 If ARG is positive number, turn showing conversation threads on."
11371   (interactive "P")
11372   (let ((current (or (gnus-summary-article-number) gnus-newsgroup-end)))
11373     (setq gnus-show-threads
11374           (if (null arg) (not gnus-show-threads)
11375             (> (prefix-numeric-value arg) 0)))
11376     (gnus-summary-prepare)
11377     (gnus-summary-goto-subject current)
11378     (gnus-message 6 "Threading is now %s" (if gnus-show-threads "on" "off"))
11379     (gnus-summary-position-point)))
11380
11381 (eval-and-compile
11382   (if (fboundp 'remove-overlays)
11383       (defalias 'gnus-remove-overlays 'remove-overlays)
11384     (defun gnus-remove-overlays (beg end name val)
11385       "Clear BEG and END of overlays whose property NAME has value VAL.
11386 For compatibility with XEmacs."
11387       (dolist (ov (gnus-overlays-in beg end))
11388         (when (eq (gnus-overlay-get ov name) val)
11389           (gnus-delete-overlay ov))))))
11390
11391 (defun gnus-summary-show-all-threads ()
11392   "Show all threads."
11393   (interactive)
11394   (gnus-remove-overlays (point-min) (point-max) 'invisible 'gnus-sum)
11395   (gnus-summary-position-point))
11396
11397 (defsubst gnus-summary--inv (p)
11398   (and (eq (get-char-property p 'invisible) 'gnus-sum) p))
11399
11400 (defun gnus-summary-show-thread ()
11401   "Show thread subtrees.
11402 Returns nil if no thread was there to be shown."
11403   (interactive)
11404   (let* ((orig (point))
11405          (end (point-at-eol))
11406          (end (or (gnus-summary--inv end) (gnus-summary--inv (1- end))))
11407          ;; Leave point at bol
11408          (beg (progn (beginning-of-line) (if (bobp) (point) (1- (point)))))
11409          (eoi (when end
11410                 (if (fboundp 'next-single-char-property-change)
11411                     (or (next-single-char-property-change end 'invisible)
11412                         (point-max))
11413                   (while (progn
11414                            (end-of-line 2)
11415                            (and (not (eobp))
11416                                 (eq (get-char-property (point) 'invisible)
11417                                     'gnus-sum))))
11418                   (point)))))
11419     (when eoi
11420       (gnus-remove-overlays beg eoi 'invisible 'gnus-sum)
11421       (goto-char orig)
11422       (gnus-summary-position-point)
11423       eoi)))
11424
11425 (defun gnus-summary-maybe-hide-threads ()
11426   "If requested, hide the threads that should be hidden."
11427   (when (and gnus-show-threads
11428              gnus-thread-hide-subtree)
11429     (gnus-summary-hide-all-threads
11430      (if (or (consp gnus-thread-hide-subtree)
11431              (functionp gnus-thread-hide-subtree))
11432          (gnus-make-predicate gnus-thread-hide-subtree)
11433        nil))))
11434
11435 ;;; Hiding predicates.
11436
11437 (defun gnus-article-unread-p (header)
11438   (memq (mail-header-number header) gnus-newsgroup-unreads))
11439
11440 (defun gnus-article-unseen-p (header)
11441   (memq (mail-header-number header) gnus-newsgroup-unseen))
11442
11443 (defun gnus-map-articles (predicate articles)
11444   "Map PREDICATE over ARTICLES and return non-nil if any predicate is non-nil."
11445   (apply 'gnus-or (mapcar predicate
11446                           (mapcar (lambda (number)
11447                                     (gnus-summary-article-header number))
11448                                   articles))))
11449
11450 (defun gnus-summary-hide-all-threads (&optional predicate)
11451   "Hide all thread subtrees.
11452 If PREDICATE is supplied, threads that satisfy this predicate
11453 will not be hidden."
11454   (interactive)
11455   (save-excursion
11456     (goto-char (point-min))
11457     (let ((end nil))
11458       (while (not end)
11459         (when (or (not predicate)
11460                   (gnus-map-articles
11461                    predicate (gnus-summary-article-children)))
11462             (gnus-summary-hide-thread))
11463         (setq end (not (zerop (gnus-summary-next-thread 1 t)))))))
11464   (gnus-summary-position-point))
11465
11466 (defun gnus-summary-hide-thread ()
11467   "Hide thread subtrees.
11468 If PREDICATE is supplied, threads that satisfy this predicate
11469 will not be hidden.
11470 Returns nil if no threads were there to be hidden."
11471   (interactive)
11472   (let ((start (point))
11473         (starteol (line-end-position))
11474         (article (gnus-summary-article-number)))
11475     (goto-char start)
11476     ;; Go forward until either the buffer ends or the subthread ends.
11477     (when (and (not (eobp))
11478                (or (zerop (gnus-summary-next-thread 1 t))
11479                    (goto-char (point-max))))
11480       (if (and (> (point) start)
11481                ;; FIXME: this should actually search for a non-invisible \n.
11482                (search-backward "\n" start t))
11483           (progn
11484             (when (> (point) starteol)
11485               (gnus-remove-overlays starteol (point) 'invisible 'gnus-sum)
11486               (let ((ol (gnus-make-overlay starteol (point) nil t nil)))
11487                 (gnus-overlay-put ol 'invisible 'gnus-sum)
11488                 (gnus-overlay-put ol 'evaporate t)))
11489             (gnus-summary-goto-subject article))
11490         (goto-char start)
11491         nil))))
11492
11493 (defun gnus-summary-go-to-next-thread (&optional previous)
11494   "Go to the same level (or less) next thread.
11495 If PREVIOUS is non-nil, go to previous thread instead.
11496 Return the article number moved to, or nil if moving was impossible."
11497   (let ((level (gnus-summary-thread-level))
11498         (way (if previous -1 1))
11499         (beg (point)))
11500     (forward-line way)
11501     (while (and (not (eobp))
11502                 (< level (gnus-summary-thread-level)))
11503       (forward-line way))
11504     (if (eobp)
11505         (progn
11506           (goto-char beg)
11507           nil)
11508       (setq beg (point))
11509       (prog1
11510           (gnus-summary-article-number)
11511         (goto-char beg)))))
11512
11513 (defun gnus-summary-next-thread (n &optional silent)
11514   "Go to the same level next N'th thread.
11515 If N is negative, search backward instead.
11516 Returns the difference between N and the number of skips actually
11517 done.
11518
11519 If SILENT, don't output messages."
11520   (interactive "p")
11521   (let ((backward (< n 0))
11522         (n (abs n)))
11523     (while (and (> n 0)
11524                 (gnus-summary-go-to-next-thread backward))
11525       (decf n))
11526     (unless silent
11527       (gnus-summary-position-point))
11528     (when (and (not silent) (/= 0 n))
11529       (gnus-message 7 "No more threads"))
11530     n))
11531
11532 (defun gnus-summary-prev-thread (n)
11533   "Go to the same level previous N'th thread.
11534 Returns the difference between N and the number of skips actually
11535 done."
11536   (interactive "p")
11537   (gnus-summary-next-thread (- n)))
11538
11539 (defun gnus-summary-go-down-thread ()
11540   "Go down one level in the current thread."
11541   (let ((children (gnus-summary-article-children)))
11542     (when children
11543       (gnus-summary-goto-subject (car children)))))
11544
11545 (defun gnus-summary-go-up-thread ()
11546   "Go up one level in the current thread."
11547   (let ((parent (gnus-summary-article-parent)))
11548     (when parent
11549       (gnus-summary-goto-subject parent))))
11550
11551 (defun gnus-summary-down-thread (n)
11552   "Go down thread N steps.
11553 If N is negative, go up instead.
11554 Returns the difference between N and how many steps down that were
11555 taken."
11556   (interactive "p")
11557   (let ((up (< n 0))
11558         (n (abs n)))
11559     (while (and (> n 0)
11560                 (if up (gnus-summary-go-up-thread)
11561                   (gnus-summary-go-down-thread)))
11562       (setq n (1- n)))
11563     (gnus-summary-position-point)
11564     (when (/= 0 n)
11565       (gnus-message 7 "Can't go further"))
11566     n))
11567
11568 (defun gnus-summary-up-thread (n)
11569   "Go up thread N steps.
11570 If N is negative, go down instead.
11571 Returns the difference between N and how many steps down that were
11572 taken."
11573   (interactive "p")
11574   (gnus-summary-down-thread (- n)))
11575
11576 (defun gnus-summary-top-thread ()
11577   "Go to the top of the thread."
11578   (interactive)
11579   (while (gnus-summary-go-up-thread))
11580   (gnus-summary-article-number))
11581
11582 (defun gnus-summary-expire-thread ()
11583   "Mark articles under current thread as expired."
11584   (interactive)
11585   (gnus-summary-kill-thread 0))
11586
11587 (defun gnus-summary-kill-thread (&optional unmark)
11588   "Mark articles under current thread as read.
11589 If the prefix argument is positive, remove any kinds of marks.
11590 If the prefix argument is zero, mark thread as expired.
11591 If the prefix argument is negative, tick articles instead."
11592   (interactive "P")
11593   (when unmark
11594     (setq unmark (prefix-numeric-value unmark)))
11595   (let ((articles (gnus-summary-articles-in-thread))
11596         (hide (or (null unmark) (= unmark 0))))
11597     (save-excursion
11598       ;; Expand the thread.
11599       (gnus-summary-show-thread)
11600       ;; Mark all the articles.
11601       (while articles
11602         (gnus-summary-goto-subject (car articles))
11603         (cond ((null unmark)
11604                (gnus-summary-mark-article-as-read gnus-killed-mark))
11605               ((> unmark 0)
11606                (gnus-summary-mark-article-as-unread gnus-unread-mark))
11607               ((= unmark 0)
11608                (gnus-summary-mark-article nil gnus-expirable-mark))
11609               (t
11610                (gnus-summary-mark-article-as-unread gnus-ticked-mark)))
11611         (setq articles (cdr articles))))
11612     ;; Hide killed subtrees when hide is true.
11613     (and hide
11614          gnus-thread-hide-killed
11615          (gnus-summary-hide-thread))
11616     ;; If hide is t, go to next unread subject.
11617     (when hide
11618       ;; Go to next unread subject.
11619       (gnus-summary-next-subject 1 t)))
11620   (gnus-set-mode-line 'summary))
11621
11622 ;; Summary sorting commands
11623
11624 (defun gnus-summary-sort-by-number (&optional reverse)
11625   "Sort the summary buffer by article number.
11626 Argument REVERSE means reverse order."
11627   (interactive "P")
11628   (gnus-summary-sort 'number reverse))
11629
11630 (defun gnus-summary-sort-by-most-recent-number (&optional reverse)
11631   "Sort the summary buffer by most recent article number.
11632 Argument REVERSE means reverse order."
11633   (interactive "P")
11634   (gnus-summary-sort 'most-recent-number reverse))
11635
11636 (defun gnus-summary-sort-by-random (&optional reverse)
11637   "Randomize the order in the summary buffer.
11638 Argument REVERSE means to randomize in reverse order."
11639   (interactive "P")
11640   (gnus-summary-sort 'random reverse))
11641
11642 (defun gnus-summary-sort-by-author (&optional reverse)
11643   "Sort the summary buffer by author name alphabetically.
11644 If `case-fold-search' is non-nil, case of letters is ignored.
11645 Argument REVERSE means reverse order."
11646   (interactive "P")
11647   (gnus-summary-sort 'author reverse))
11648
11649 (defun gnus-summary-sort-by-recipient (&optional reverse)
11650   "Sort the summary buffer by recipient name alphabetically.
11651 If `case-fold-search' is non-nil, case of letters is ignored.
11652 Argument REVERSE means reverse order."
11653   (interactive "P")
11654   (gnus-summary-sort 'recipient reverse))
11655
11656 (defun gnus-summary-sort-by-subject (&optional reverse)
11657   "Sort the summary buffer by subject alphabetically.  `Re:'s are ignored.
11658 If `case-fold-search' is non-nil, case of letters is ignored.
11659 Argument REVERSE means reverse order."
11660   (interactive "P")
11661   (gnus-summary-sort 'subject reverse))
11662
11663 (defun gnus-summary-sort-by-date (&optional reverse)
11664   "Sort the summary buffer by date.
11665 Argument REVERSE means reverse order."
11666   (interactive "P")
11667   (gnus-summary-sort 'date reverse))
11668
11669 (defun gnus-summary-sort-by-most-recent-date (&optional reverse)
11670   "Sort the summary buffer by most recent date.
11671 Argument REVERSE means reverse order."
11672   (interactive "P")
11673   (gnus-summary-sort 'most-recent-date reverse))
11674
11675 (defun gnus-summary-sort-by-score (&optional reverse)
11676   "Sort the summary buffer by score.
11677 Argument REVERSE means reverse order."
11678   (interactive "P")
11679   (gnus-summary-sort 'score reverse))
11680
11681 (defun gnus-summary-sort-by-lines (&optional reverse)
11682   "Sort the summary buffer by the number of lines.
11683 Argument REVERSE means reverse order."
11684   (interactive "P")
11685   (gnus-summary-sort 'lines reverse))
11686
11687 (defun gnus-summary-sort-by-chars (&optional reverse)
11688   "Sort the summary buffer by article length.
11689 Argument REVERSE means reverse order."
11690   (interactive "P")
11691   (gnus-summary-sort 'chars reverse))
11692
11693 (defun gnus-summary-sort-by-original (&optional reverse)
11694   "Sort the summary buffer using the default sorting method.
11695 Argument REVERSE means reverse order."
11696   (interactive "P")
11697   (let* ((inhibit-read-only t)
11698          (gnus-summary-prepare-hook nil))
11699     ;; We do the sorting by regenerating the threads.
11700     (gnus-summary-prepare)
11701     ;; Hide subthreads if needed.
11702     (gnus-summary-maybe-hide-threads)))
11703
11704 (defun gnus-summary-sort (predicate reverse)
11705   "Sort summary buffer by PREDICATE.  REVERSE means reverse order."
11706   (let* ((thread (intern (format "gnus-thread-sort-by-%s" predicate)))
11707          (article (intern (format "gnus-article-sort-by-%s" predicate)))
11708          (gnus-thread-sort-functions
11709           (if (not reverse)
11710               thread
11711             `(lambda (t1 t2)
11712                (,thread t2 t1))))
11713          (gnus-sort-gathered-threads-function
11714           gnus-thread-sort-functions)
11715          (gnus-article-sort-functions
11716           (if (not reverse)
11717               article
11718             `(lambda (t1 t2)
11719                (,article t2 t1))))
11720          (inhibit-read-only t)
11721          (gnus-summary-prepare-hook nil))
11722     ;; We do the sorting by regenerating the threads.
11723     (gnus-summary-prepare)
11724     ;; Hide subthreads if needed.
11725     (gnus-summary-maybe-hide-threads)))
11726
11727 ;; Summary saving commands.
11728
11729 (defun gnus-summary-save-article (&optional n not-saved)
11730   "Save the current article using the default saver function.
11731 If N is a positive number, save the N next articles.
11732 If N is a negative number, save the N previous articles.
11733 If N is nil and any articles have been marked with the process mark,
11734 save those articles instead.
11735 The variable `gnus-default-article-saver' specifies the saver function.
11736
11737 If the optional second argument NOT-SAVED is non-nil, articles saved
11738 will not be marked as saved."
11739   (interactive "P")
11740   (require 'gnus-art)
11741   (let* ((articles (gnus-summary-work-articles n))
11742          (save-buffer (save-excursion
11743                         (nnheader-set-temp-buffer " *Gnus Save*")))
11744          (num (length articles))
11745          ;; Whether to save decoded articles or raw articles.
11746          (decode (when gnus-article-save-coding-system
11747                    (get gnus-default-article-saver :decode)))
11748          ;; When saving many articles in a single file, use the other
11749          ;; function to save articles other than the first one.
11750          (saver2 (get gnus-default-article-saver :function))
11751          (gnus-prompt-before-saving (if saver2
11752                                         t
11753                                       gnus-prompt-before-saving))
11754          (gnus-default-article-saver gnus-default-article-saver)
11755          header file)
11756     (dolist (article articles)
11757       (setq header (gnus-summary-article-header article))
11758       (if (not (vectorp header))
11759           ;; This is a pseudo-article.
11760           (if (assq 'name header)
11761               (gnus-copy-file (cdr (assq 'name header)))
11762             (gnus-message 1 "Article %d is unsaveable" article))
11763         ;; This is a real article.
11764         (save-window-excursion
11765           (gnus-summary-select-article decode decode nil article)
11766           (gnus-summary-goto-subject article))
11767         (with-current-buffer save-buffer
11768           (erase-buffer)
11769           (insert-buffer-substring (if decode
11770                                        gnus-article-buffer
11771                                      gnus-original-article-buffer)))
11772         (setq file (gnus-article-save save-buffer file num))
11773         (gnus-summary-remove-process-mark article)
11774         (unless not-saved
11775           (gnus-summary-set-saved-mark article)))
11776       (when saver2
11777         (setq gnus-default-article-saver saver2
11778               saver2 nil)))
11779     (gnus-kill-buffer save-buffer)
11780     (gnus-summary-position-point)
11781     (gnus-set-mode-line 'summary)
11782     n))
11783
11784 (defun gnus-summary-pipe-output (&optional n sym)
11785   "Pipe the current article to a subprocess.
11786 If N is a positive number, pipe the N next articles.
11787 If N is a negative number, pipe the N previous articles.
11788 If N is nil and any articles have been marked with the process mark,
11789 pipe those articles instead.
11790 The default command to which articles are piped is specified by the
11791 variable `gnus-summary-pipe-output-default-command'; if it is nil, you
11792 will be prompted for the command.
11793
11794 The properties `:decode' and `:headers' that are put to the function
11795 symbol `gnus-summary-save-in-pipe' control whether this function
11796 decodes articles and what headers to keep (see the doc string for the
11797 `gnus-default-article-saver' variable).  If SYM (the symbolic prefix)
11798 is neither omitted nor the symbol `r', force including all headers
11799 regardless of the `:headers' property.  If it is the symbol `r',
11800 articles that are not decoded and include all headers will be piped
11801 no matter what the properties `:decode' and `:headers' are."
11802   (interactive (gnus-interactive "P\ny"))
11803   (require 'gnus-art)
11804   (let* ((articles (gnus-summary-work-articles n))
11805          (result-buffer "*Shell Command Output*")
11806          (all-headers (not (memq sym '(nil r))))
11807          (gnus-save-all-headers (or all-headers gnus-save-all-headers))
11808          (raw (eq sym 'r))
11809          (headers (get 'gnus-summary-save-in-pipe :headers))
11810          command result)
11811     (unless (numberp (car articles))
11812       (error "No article to pipe"))
11813     (setq command (gnus-read-shell-command
11814                    (concat "Shell command on "
11815                            (if (cdr articles)
11816                                (format "these %d articles" (length articles))
11817                              "this article")
11818                            ": ")
11819                    gnus-summary-pipe-output-default-command))
11820     (when (string-equal command "")
11821       (error "A command is required"))
11822     (when all-headers
11823       (put 'gnus-summary-save-in-pipe :headers nil))
11824     (unwind-protect
11825         (while articles
11826           (gnus-summary-goto-subject (pop articles))
11827           (save-window-excursion (gnus-summary-save-in-pipe command raw))
11828           (when (and (get-buffer result-buffer)
11829                      (not (zerop (buffer-size (get-buffer result-buffer)))))
11830             (setq result (concat result (with-current-buffer result-buffer
11831                                           (buffer-string))))))
11832       (put 'gnus-summary-save-in-pipe :headers headers))
11833     (unless (zerop (length result))
11834       (if (with-current-buffer (get-buffer-create result-buffer)
11835             (erase-buffer)
11836             (insert result)
11837             (prog1
11838                 (and (= (count-lines (point-min) (point)) 1)
11839                      (progn
11840                        (end-of-line 0)
11841                        (<= (current-column)
11842                            (window-width (minibuffer-window)))))
11843               (goto-char (point-min))))
11844           (message "%s" (substring result 0 -1))
11845         (message nil)
11846         (gnus-configure-windows 'pipe)))))
11847
11848 (defun gnus-summary-save-article-mail (&optional arg)
11849   "Append the current article to a Unix mail box file.
11850 If N is a positive number, save the N next articles.
11851 If N is a negative number, save the N previous articles.
11852 If N is nil and any articles have been marked with the process mark,
11853 save those articles instead."
11854   (interactive "P")
11855   (require 'gnus-art)
11856   (let ((gnus-default-article-saver 'gnus-summary-save-in-mail))
11857     (gnus-summary-save-article arg)))
11858
11859 (defun gnus-summary-save-article-rmail (&optional arg)
11860   "Append the current article to an rmail file.
11861 If N is a positive number, save the N next articles.
11862 If N is a negative number, save the N previous articles.
11863 If N is nil and any articles have been marked with the process mark,
11864 save those articles instead."
11865   (interactive "P")
11866   (require 'gnus-art)
11867   (let ((gnus-default-article-saver 'gnus-summary-save-in-rmail))
11868     (gnus-summary-save-article arg)))
11869
11870 (defun gnus-summary-save-article-file (&optional arg)
11871   "Append the current article to a file.
11872 If N is a positive number, save the N next articles.
11873 If N is a negative number, save the N previous articles.
11874 If N is nil and any articles have been marked with the process mark,
11875 save those articles instead."
11876   (interactive "P")
11877   (require 'gnus-art)
11878   (let ((gnus-default-article-saver 'gnus-summary-save-in-file))
11879     (gnus-summary-save-article arg)))
11880
11881 (defun gnus-summary-write-article-file (&optional arg)
11882   "Write the current article to a file, deleting the previous file.
11883 If N is a positive number, save the N next articles.
11884 If N is a negative number, save the N previous articles.
11885 If N is nil and any articles have been marked with the process mark,
11886 save those articles instead."
11887   (interactive "P")
11888   (require 'gnus-art)
11889   (let ((gnus-default-article-saver 'gnus-summary-write-to-file))
11890     (gnus-summary-save-article arg)))
11891
11892 (defun gnus-summary-save-article-body-file (&optional arg)
11893   "Append the current article body to a file.
11894 If N is a positive number, save the N next articles.
11895 If N is a negative number, save the N previous articles.
11896 If N is nil and any articles have been marked with the process mark,
11897 save those articles instead."
11898   (interactive "P")
11899   (require 'gnus-art)
11900   (let ((gnus-default-article-saver 'gnus-summary-save-body-in-file))
11901     (gnus-summary-save-article arg)))
11902
11903 (defun gnus-summary-write-article-body-file (&optional arg)
11904   "Write the current article body to a file, deleting the previous file.
11905 If N is a positive number, save the N next articles.
11906 If N is a negative number, save the N previous articles.
11907 If N is nil and any articles have been marked with the process mark,
11908 save those articles instead."
11909   (interactive "P")
11910   (require 'gnus-art)
11911   (let ((gnus-default-article-saver 'gnus-summary-write-body-to-file))
11912     (gnus-summary-save-article arg)))
11913
11914 (defun gnus-summary-muttprint (&optional arg)
11915   "Print the current article using Muttprint.
11916 If N is a positive number, save the N next articles.
11917 If N is a negative number, save the N previous articles.
11918 If N is nil and any articles have been marked with the process mark,
11919 save those articles instead."
11920   (interactive "P")
11921   (require 'gnus-art)
11922   (let ((gnus-default-article-saver 'gnus-summary-pipe-to-muttprint))
11923     (gnus-summary-save-article arg t)))
11924
11925 (defun gnus-summary-pipe-message (program)
11926   "Pipe the current article through PROGRAM."
11927   (interactive "sProgram: ")
11928   (gnus-summary-select-article)
11929   (let ((mail-header-separator ""))
11930     (gnus-eval-in-buffer-window gnus-article-buffer
11931       (save-restriction
11932         (widen)
11933         (let ((start (window-start))
11934               (inhibit-read-only t))
11935           (message-pipe-buffer-body program)
11936           (set-window-start (get-buffer-window (current-buffer)) start))))))
11937
11938 (defun gnus-get-split-value (methods)
11939   "Return a value based on the split METHODS."
11940   (let (split-name method result match)
11941     (when methods
11942       (with-current-buffer gnus-original-article-buffer
11943         (save-restriction
11944           (nnheader-narrow-to-headers)
11945           (while (and methods (not split-name))
11946             (goto-char (point-min))
11947             (setq method (pop methods))
11948             (setq match (car method))
11949             (when (cond
11950                    ((stringp match)
11951                     ;; Regular expression.
11952                     (ignore-errors
11953                       (re-search-forward match nil t)))
11954                    ((functionp match)
11955                     ;; Function.
11956                     (save-restriction
11957                       (widen)
11958                       (setq result (funcall match gnus-newsgroup-name))))
11959                    ((consp match)
11960                     ;; Form.
11961                     (save-restriction
11962                       (widen)
11963                       (setq result (eval match)))))
11964               (setq split-name (cdr method))
11965               (cond ((stringp result)
11966                      (push (expand-file-name
11967                             result gnus-article-save-directory)
11968                            split-name))
11969                     ((consp result)
11970                      (setq split-name (append result split-name)))))))))
11971     (nreverse split-name)))
11972
11973 (defun gnus-valid-move-group-p (group)
11974   (and (symbolp group)
11975        (boundp group)
11976        (symbol-name group)
11977        (symbol-value group)
11978        (gnus-get-function (gnus-find-method-for-group
11979                            (symbol-name group)) 'request-accept-article t)))
11980
11981 (defun gnus-read-move-group-name (prompt default articles prefix)
11982   "Read a group name."
11983   (let* ((split-name (gnus-get-split-value gnus-move-split-methods))
11984          (minibuffer-confirm-incomplete nil) ; XEmacs
11985          (prom
11986           (format "%s %s to"
11987                   prompt
11988                   (if (> (length articles) 1)
11989                       (format "these %d articles" (length articles))
11990                     "this article")))
11991          (to-newsgroup
11992           (cond
11993            ((null split-name)
11994             (gnus-group-completing-read
11995              prom
11996              (gnus-remove-if-not 'gnus-valid-move-group-p gnus-active-hashtb t)
11997              nil prefix nil default))
11998            ((= 1 (length split-name))
11999             (gnus-group-completing-read
12000              prom
12001              (gnus-remove-if-not 'gnus-valid-move-group-p gnus-active-hashtb t)
12002              nil prefix 'gnus-group-history (car split-name)))
12003            (t
12004             (gnus-completing-read
12005              prom (nreverse split-name) nil nil 'gnus-group-history))))
12006          (to-method (gnus-server-to-method (gnus-group-method to-newsgroup)))
12007          encoded)
12008     (when to-newsgroup
12009       (if (or (string= to-newsgroup "")
12010               (string= to-newsgroup prefix))
12011           (setq to-newsgroup default))
12012       (unless to-newsgroup
12013         (error "No group name entered"))
12014       (setq encoded (mm-encode-coding-string
12015                      to-newsgroup
12016                      (gnus-group-name-charset to-method to-newsgroup)))
12017       (or (gnus-active encoded)
12018           (gnus-activate-group encoded nil nil to-method)
12019           (if (gnus-y-or-n-p (format "No such group: %s.  Create it? "
12020                                      to-newsgroup))
12021               (or (and (gnus-request-create-group encoded to-method)
12022                        (gnus-activate-group encoded nil nil to-method)
12023                        (gnus-subscribe-group encoded))
12024                   (error "Couldn't create group %s" to-newsgroup)))
12025           (error "No such group: %s" to-newsgroup))
12026       encoded)))
12027
12028 (defvar gnus-summary-save-parts-counter)
12029 (declare-function mm-uu-dissect "mm-uu" (&optional noheader mime-type))
12030
12031 (defun gnus-summary-save-parts (type dir n &optional reverse)
12032   "Save parts matching TYPE to DIR.
12033 If REVERSE, save parts that do not match TYPE."
12034   (interactive
12035    (list (read-string "Save parts of type: "
12036                       (or (car gnus-summary-save-parts-type-history)
12037                           gnus-summary-save-parts-default-mime)
12038                       'gnus-summary-save-parts-type-history)
12039          (setq gnus-summary-save-parts-last-directory
12040                (read-file-name "Save to directory: "
12041                                gnus-summary-save-parts-last-directory
12042                                nil t))
12043          current-prefix-arg))
12044   (gnus-summary-iterate n
12045     (let ((gnus-display-mime-function nil)
12046           gnus-article-prepare-hook
12047           gnus-article-decode-hook
12048           gnus-display-mime-function
12049           gnus-break-pages
12050           (gnus-inhibit-treatment t))
12051       (gnus-summary-select-article))
12052     (with-current-buffer gnus-article-buffer
12053       (let ((handles (or gnus-article-mime-handles
12054                          (mm-dissect-buffer nil gnus-article-loose-mime)
12055                          (and gnus-article-emulate-mime
12056                               (mm-uu-dissect))))
12057             (gnus-summary-save-parts-counter 1))
12058         (when handles
12059           (gnus-summary-save-parts-1 type dir handles reverse)
12060           (unless gnus-article-mime-handles ;; Don't destroy this case.
12061             (mm-destroy-parts handles)))))))
12062
12063 (defun gnus-summary-save-parts-1 (type dir handle reverse)
12064   (if (stringp (car handle))
12065       (mapcar (lambda (h) (gnus-summary-save-parts-1 type dir h reverse))
12066               (cdr handle))
12067     (when (if reverse
12068               (not (string-match type (mm-handle-media-type handle)))
12069             (string-match type (mm-handle-media-type handle)))
12070       (let ((file (expand-file-name
12071                    (gnus-map-function
12072                     mm-file-name-rewrite-functions
12073                     (file-name-nondirectory
12074                      (or
12075                       (mail-content-type-get
12076                        (mm-handle-disposition handle) 'filename)
12077                       (mail-content-type-get
12078                        (mm-handle-type handle) 'name)
12079                       (format "%s.%d.%d" gnus-newsgroup-name
12080                               (cdr gnus-article-current)
12081                               gnus-summary-save-parts-counter))))
12082                    dir)))
12083         (incf gnus-summary-save-parts-counter)
12084         (unless (file-exists-p file)
12085           (mm-save-part-to-file handle file))))))
12086
12087 ;; Summary extract commands
12088
12089 (defun gnus-summary-insert-pseudos (pslist &optional not-view)
12090   (let ((inhibit-read-only t)
12091         (article (gnus-summary-article-number))
12092         after-article b e)
12093     (unless (gnus-summary-goto-subject article)
12094       (error "No such article: %d" article))
12095     (gnus-summary-position-point)
12096     ;; If all commands are to be bunched up on one line, we collect
12097     ;; them here.
12098     (unless gnus-view-pseudos-separately
12099       (let ((ps (setq pslist (sort pslist 'gnus-pseudos<)))
12100             files action)
12101         (while ps
12102           (setq action (cdr (assq 'action (car ps))))
12103           (setq files (list (cdr (assq 'name (car ps)))))
12104           (while (and ps (cdr ps)
12105                       (string= (or action "1")
12106                                (or (cdr (assq 'action (cadr ps))) "2")))
12107             (push (cdr (assq 'name (cadr ps))) files)
12108             (setcdr ps (cddr ps)))
12109           (when files
12110             (when (not (string-match "%s" action))
12111               (push " " files))
12112             (push " " files)
12113             (when (assq 'execute (car ps))
12114               (setcdr (assq 'execute (car ps))
12115                       (funcall (if (string-match "%s" action)
12116                                    'format 'concat)
12117                                action
12118                                (mapconcat
12119                                 (lambda (f)
12120                                   (if (equal f " ")
12121                                       f
12122                                     (shell-quote-argument f)))
12123                                 files " ")))))
12124           (setq ps (cdr ps)))))
12125     (if (and gnus-view-pseudos (not not-view))
12126         (while pslist
12127           (when (assq 'execute (car pslist))
12128             (gnus-execute-command (cdr (assq 'execute (car pslist)))
12129                                   (eq gnus-view-pseudos 'not-confirm)))
12130           (setq pslist (cdr pslist)))
12131       (save-excursion
12132         (while pslist
12133           (setq after-article (or (cdr (assq 'article (car pslist)))
12134                                   (gnus-summary-article-number)))
12135           (gnus-summary-goto-subject after-article)
12136           (forward-line 1)
12137           (setq b (point))
12138           (insert "    " (file-name-nondirectory
12139                           (cdr (assq 'name (car pslist))))
12140                   ": " (or (cdr (assq 'execute (car pslist))) "") "\n")
12141           (setq e (point))
12142           (forward-line -1)             ; back to `b'
12143           (gnus-add-text-properties
12144            b (1- e) (list 'gnus-number gnus-reffed-article-number
12145                           gnus-mouse-face-prop gnus-mouse-face))
12146           (gnus-data-enter
12147            after-article gnus-reffed-article-number
12148            gnus-unread-mark b (car pslist) 0 (- e b))
12149           (setq gnus-newsgroup-unreads
12150                 (gnus-add-to-sorted-list gnus-newsgroup-unreads
12151                                          gnus-reffed-article-number))
12152           (setq gnus-reffed-article-number (1- gnus-reffed-article-number))
12153           (setq pslist (cdr pslist)))))))
12154
12155 (defun gnus-pseudos< (p1 p2)
12156   (let ((c1 (cdr (assq 'action p1)))
12157         (c2 (cdr (assq 'action p2))))
12158     (and c1 c2 (string< c1 c2))))
12159
12160 (defun gnus-request-pseudo-article (props)
12161   (cond ((assq 'execute props)
12162          (gnus-execute-command (cdr (assq 'execute props)))))
12163   (let ((gnus-current-article (gnus-summary-article-number)))
12164     (gnus-run-hooks 'gnus-mark-article-hook)))
12165
12166 (defun gnus-execute-command (command &optional automatic)
12167   (save-excursion
12168     (gnus-article-setup-buffer)
12169     (set-buffer gnus-article-buffer)
12170     (setq buffer-read-only nil)
12171     (let ((command (if automatic command
12172                      (read-string "Command: " (cons command 0)))))
12173       (erase-buffer)
12174       (insert "$ " command "\n\n")
12175       (if gnus-view-pseudo-asynchronously
12176           (start-process "gnus-execute" (current-buffer) shell-file-name
12177                          shell-command-switch command)
12178         (call-process shell-file-name nil t nil
12179                       shell-command-switch command)))))
12180
12181 ;; Summary kill commands.
12182
12183 (defun gnus-summary-edit-global-kill (article)
12184   "Edit the \"global\" kill file."
12185   (interactive (list (gnus-summary-article-number)))
12186   (gnus-group-edit-global-kill article))
12187
12188 (defun gnus-summary-edit-local-kill ()
12189   "Edit a local kill file applied to the current newsgroup."
12190   (interactive)
12191   (setq gnus-current-headers (gnus-summary-article-header))
12192   (gnus-group-edit-local-kill
12193    (gnus-summary-article-number) gnus-newsgroup-name))
12194
12195 ;;; Header reading.
12196
12197 (defun gnus-read-header (id &optional header)
12198   "Read the headers of article ID and enter them into the Gnus system."
12199   (let ((group gnus-newsgroup-name)
12200         (gnus-override-method
12201          (or
12202           gnus-override-method
12203           (and (gnus-news-group-p gnus-newsgroup-name)
12204                (car (gnus-refer-article-methods)))))
12205         where)
12206     ;; First we check to see whether the header in question is already
12207     ;; fetched.
12208     (if (stringp id)
12209         ;; This is a Message-ID.
12210         (setq header (or header (gnus-id-to-header id)))
12211       ;; This is an article number.
12212       (setq header (or header (gnus-summary-article-header id))))
12213     (if (and header
12214              (not (gnus-summary-article-sparse-p (mail-header-number header))))
12215         ;; We have found the header.
12216         header
12217       ;; We have to really fetch the header to this article.
12218       (with-current-buffer nntp-server-buffer
12219         (when (setq where (gnus-request-head id group))
12220           (nnheader-fold-continuation-lines)
12221           (goto-char (point-max))
12222           (insert ".\n")
12223           (goto-char (point-min))
12224           (insert "211 ")
12225           (princ (cond
12226                   ((numberp id) id)
12227                   ((cdr where) (cdr where))
12228                   (header (mail-header-number header))
12229                   (t gnus-reffed-article-number))
12230                  (current-buffer))
12231           (insert " Article retrieved.\n"))
12232         (if (or (not where)
12233                 (not (setq header (car (gnus-get-newsgroup-headers nil t)))))
12234             ()                          ; Malformed head.
12235           (unless (gnus-summary-article-sparse-p (mail-header-number header))
12236             (when (and (stringp id)
12237                        (or
12238                         (not (string= (gnus-group-real-name group)
12239                                       (car where)))
12240                         (not (gnus-server-equal gnus-override-method
12241                                                 (gnus-group-method group)))))
12242               ;; If we fetched by Message-ID and the article came from
12243               ;; a different group (or server), we fudge some bogus
12244               ;; article numbers for this article.
12245               (mail-header-set-number header gnus-reffed-article-number))
12246             (with-current-buffer gnus-summary-buffer
12247               (decf gnus-reffed-article-number)
12248               (gnus-remove-header (mail-header-number header))
12249               (push header gnus-newsgroup-headers)
12250               (setq gnus-current-headers header)
12251               (push (mail-header-number header) gnus-newsgroup-limit)))
12252           header)))))
12253
12254 (defun gnus-remove-header (number)
12255   "Remove header NUMBER from `gnus-newsgroup-headers'."
12256   (if (and gnus-newsgroup-headers
12257            (= number (mail-header-number (car gnus-newsgroup-headers))))
12258       (pop gnus-newsgroup-headers)
12259     (let ((headers gnus-newsgroup-headers))
12260       (while (and (cdr headers)
12261                   (not (= number (mail-header-number (cadr headers)))))
12262         (pop headers))
12263       (when (cdr headers)
12264         (setcdr headers (cddr headers))))))
12265
12266 ;;;
12267 ;;; summary highlights
12268 ;;;
12269
12270 (defun gnus-highlight-selected-summary ()
12271   "Highlight selected article in summary buffer."
12272   ;; Added by Per Abrahamsen <amanda@iesd.auc.dk>.
12273   (when gnus-summary-selected-face
12274     (save-excursion
12275       (let* ((beg (point-at-bol))
12276              (end (point-at-eol))
12277              ;; Fix by Mike Dugan <dugan@bucrf16.bu.edu>.
12278              (from (if (get-text-property beg gnus-mouse-face-prop)
12279                        beg
12280                      (or (next-single-property-change
12281                           beg gnus-mouse-face-prop nil end)
12282                          beg)))
12283              (to
12284               (if (= from end)
12285                   (- from 2)
12286                 (or (next-single-property-change
12287                      from gnus-mouse-face-prop nil end)
12288                     end))))
12289         ;; If no mouse-face prop on line we will have to = from = end,
12290         ;; so we highlight the entire line instead.
12291         (when (= (+ to 2) from)
12292           (setq from beg)
12293           (setq to end))
12294         (if gnus-newsgroup-selected-overlay
12295             ;; Move old overlay.
12296             (gnus-move-overlay
12297              gnus-newsgroup-selected-overlay from to (current-buffer))
12298           ;; Create new overlay.
12299           (gnus-overlay-put
12300            (setq gnus-newsgroup-selected-overlay (gnus-make-overlay from to))
12301            'face gnus-summary-selected-face))))))
12302
12303 (defvar gnus-summary-highlight-line-cached nil)
12304 (defvar gnus-summary-highlight-line-trigger nil)
12305
12306 (defun gnus-summary-highlight-line-0 ()
12307   (if (and (eq gnus-summary-highlight-line-trigger
12308                gnus-summary-highlight)
12309            gnus-summary-highlight-line-cached)
12310       gnus-summary-highlight-line-cached
12311     (setq gnus-summary-highlight-line-trigger gnus-summary-highlight
12312           gnus-summary-highlight-line-cached
12313           (let* ((cond (list 'cond))
12314                  (c cond)
12315                  (list gnus-summary-highlight))
12316             (while list
12317               (setcdr c (cons (list (caar list) (list 'quote (cdar list)))
12318                               nil))
12319               (setq c (cdr c)
12320                     list (cdr list)))
12321             (gnus-byte-compile (list 'lambda nil cond))))))
12322
12323 (defun gnus-summary-highlight-line ()
12324   "Highlight current line according to `gnus-summary-highlight'."
12325   (let* ((beg (point-at-bol))
12326          (article (or (gnus-summary-article-number) gnus-current-article))
12327          (score (or (cdr (assq article
12328                                gnus-newsgroup-scored))
12329                     gnus-summary-default-score 0))
12330          (mark (or (gnus-summary-article-mark) gnus-unread-mark))
12331          (inhibit-read-only t)
12332          (default gnus-summary-default-score)
12333          (default-high gnus-summary-default-high-score)
12334          (default-low gnus-summary-default-low-score)
12335          (uncached (and gnus-summary-use-undownloaded-faces
12336                         (memq article gnus-newsgroup-undownloaded)
12337                         (not (memq article gnus-newsgroup-cached)))))
12338     (let ((face (funcall (gnus-summary-highlight-line-0))))
12339       (unless (eq face (get-text-property beg 'face))
12340         (gnus-put-text-property-excluding-characters-with-faces
12341          beg (point-at-eol) 'face
12342          (setq face (if (boundp face) (symbol-value face) face)))
12343         (when gnus-summary-highlight-line-function
12344           (funcall gnus-summary-highlight-line-function article face))))))
12345
12346 (defun gnus-update-read-articles (group unread &optional compute)
12347   "Update the list of read articles in GROUP.
12348 UNREAD is a sorted list."
12349   (let ((active (or gnus-newsgroup-active (gnus-active group)))
12350         (info (gnus-get-info group))
12351         (prev 1)
12352         read)
12353     (if (or (not info) (not active))
12354         ;; There is no info on this group if it was, in fact,
12355         ;; killed.  Gnus stores no information on killed groups, so
12356         ;; there's nothing to be done.
12357         ;; One could store the information somewhere temporarily,
12358         ;; perhaps...  Hmmm...
12359         ()
12360       ;; Remove any negative articles numbers.
12361       (while (and unread (< (car unread) 0))
12362         (setq unread (cdr unread)))
12363       ;; Remove any expired article numbers
12364       (while (and unread (< (car unread) (car active)))
12365         (setq unread (cdr unread)))
12366       ;; Compute the ranges of read articles by looking at the list of
12367       ;; unread articles.
12368       (while unread
12369         (when (/= (car unread) prev)
12370           (push (if (= prev (1- (car unread))) prev
12371                   (cons prev (1- (car unread))))
12372                 read))
12373         (setq prev (1+ (car unread)))
12374         (setq unread (cdr unread)))
12375       (when (<= prev (cdr active))
12376         (push (cons prev (cdr active)) read))
12377       (setq read (if (> (length read) 1) (nreverse read) read))
12378       (if compute
12379           read
12380         (save-excursion
12381           (let (setmarkundo)
12382             ;; Propagate the read marks to the backend.
12383             (when (and gnus-propagate-marks
12384                        (gnus-check-backend-function 'request-set-mark group))
12385               (let ((del (gnus-remove-from-range (gnus-info-read info) read))
12386                     (add (gnus-remove-from-range read (gnus-info-read info))))
12387                 (when (or add del)
12388                   (unless (gnus-check-group group)
12389                     (error "Can't open server for %s" group))
12390                   (gnus-request-set-mark
12391                    group (delq nil (list (if add (list add 'add '(read)))
12392                                          (if del (list del 'del '(read))))))
12393                   (setq setmarkundo
12394                         `(gnus-request-set-mark
12395                           ,group
12396                           ',(delq nil (list
12397                                        (if del (list del 'add '(read)))
12398                                        (if add (list add 'del '(read))))))))))
12399             (set-buffer gnus-group-buffer)
12400             (gnus-undo-register
12401               `(progn
12402                  (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
12403                  (gnus-info-set-read ',info ',(gnus-info-read info))
12404                  (gnus-get-unread-articles-in-group ',info
12405                                                     (gnus-active ,group))
12406                  (gnus-group-update-group ,group t)
12407                  ,setmarkundo))))
12408         ;; Enter this list into the group info.
12409         (gnus-info-set-read info read)
12410         ;; Set the number of unread articles in gnus-newsrc-hashtb.
12411         (gnus-get-unread-articles-in-group info (gnus-active group))
12412         t))))
12413
12414 (defun gnus-offer-save-summaries ()
12415   "Offer to save all active summary buffers."
12416   (let (buffers)
12417     ;; Go through all buffers and find all summaries.
12418     (dolist (buffer (buffer-list))
12419       (when (and (setq buffer (buffer-name buffer))
12420                  (string-match "Summary" buffer)
12421                  (with-current-buffer buffer
12422                    ;; We check that this is, indeed, a summary buffer.
12423                    (and (eq major-mode 'gnus-summary-mode)
12424                         ;; Also make sure this isn't bogus.
12425                         gnus-newsgroup-prepared
12426                         ;; Also make sure that this isn't a
12427                         ;; dead summary buffer.
12428                         (not gnus-dead-summary-mode))))
12429         (push buffer buffers)))
12430     ;; Go through all these summary buffers and offer to save them.
12431     (when buffers
12432       (save-excursion
12433         (map-y-or-n-p
12434          "Update summary buffer %s? "
12435          (lambda (buf)
12436            (switch-to-buffer buf)
12437            (gnus-summary-exit))
12438          buffers)))))
12439
12440 (defun gnus-summary-setup-default-charset ()
12441   "Setup newsgroup default charset."
12442   (if (member gnus-newsgroup-name '("nndraft:delayed" "nndraft:drafts"))
12443       (setq gnus-newsgroup-charset nil)
12444     (let* ((ignored-charsets
12445             (or gnus-newsgroup-ephemeral-ignored-charsets
12446                 (append
12447                  (and gnus-newsgroup-name
12448                       (gnus-parameter-ignored-charsets gnus-newsgroup-name))
12449                  gnus-newsgroup-ignored-charsets))))
12450       (setq gnus-newsgroup-charset
12451             (or gnus-newsgroup-ephemeral-charset
12452                 (and gnus-newsgroup-name
12453                      (gnus-parameter-charset gnus-newsgroup-name))
12454                 gnus-default-charset))
12455       (set (make-local-variable 'gnus-newsgroup-ignored-charsets)
12456            ignored-charsets))))
12457
12458 ;;;
12459 ;;; Mime Commands
12460 ;;;
12461
12462 (defun gnus-summary-display-buttonized (&optional show-all-parts)
12463   "Display the current article buffer fully MIME-buttonized.
12464 If SHOW-ALL-PARTS (the prefix) is non-nil, all multipart/* parts are
12465 treated as multipart/mixed."
12466   (interactive "P")
12467   (require 'gnus-art)
12468   (let ((gnus-unbuttonized-mime-types nil)
12469         (gnus-mime-display-multipart-as-mixed show-all-parts))
12470     (gnus-summary-show-article)))
12471
12472 (defun gnus-summary-repair-multipart (article)
12473   "Add a Content-Type header to a multipart article without one."
12474   (interactive (list (gnus-summary-article-number)))
12475   (gnus-with-article article
12476     (message-narrow-to-head)
12477     (message-remove-header "Mime-Version")
12478     (goto-char (point-max))
12479     (insert "Mime-Version: 1.0\n")
12480     (widen)
12481     (when (search-forward "\n--" nil t)
12482       (let ((separator (buffer-substring (point) (point-at-eol))))
12483         (message-narrow-to-head)
12484         (message-remove-header "Content-Type")
12485         (goto-char (point-max))
12486         (insert (format "Content-Type: multipart/mixed; boundary=\"%s\"\n"
12487                         separator))
12488         (widen))))
12489   (let (gnus-mark-article-hook)
12490     (gnus-summary-select-article t t nil article)))
12491
12492 (defun gnus-summary-toggle-display-buttonized ()
12493   "Toggle the buttonizing of the article buffer."
12494   (interactive)
12495   (require 'gnus-art)
12496   (if (setq gnus-inhibit-mime-unbuttonizing
12497             (not gnus-inhibit-mime-unbuttonizing))
12498       (let ((gnus-unbuttonized-mime-types nil))
12499         (gnus-summary-show-article))
12500     (gnus-summary-show-article)))
12501
12502 ;;;
12503 ;;; Generic summary marking commands
12504 ;;;
12505
12506 (defvar gnus-summary-marking-alist
12507   '((read gnus-del-mark "d")
12508     (unread gnus-unread-mark "u")
12509     (ticked gnus-ticked-mark "!")
12510     (dormant gnus-dormant-mark "?")
12511     (expirable gnus-expirable-mark "e"))
12512   "An alist of names/marks/keystrokes.")
12513
12514 (defvar gnus-summary-generic-mark-map (make-sparse-keymap))
12515 (defvar gnus-summary-mark-map)
12516
12517 (defun gnus-summary-make-all-marking-commands ()
12518   (define-key gnus-summary-mark-map "M" gnus-summary-generic-mark-map)
12519   (dolist (elem gnus-summary-marking-alist)
12520     (apply 'gnus-summary-make-marking-command elem)))
12521
12522 (defun gnus-summary-make-marking-command (name mark keystroke)
12523   (let ((map (make-sparse-keymap)))
12524     (define-key gnus-summary-generic-mark-map keystroke map)
12525     (dolist (lway `((next "next" next nil "n")
12526                     (next-unread "next unread" next t "N")
12527                     (prev "previous" prev nil "p")
12528                     (prev-unread "previous unread" prev t "P")
12529                     (nomove "" nil nil ,keystroke)))
12530       (let ((func (gnus-summary-make-marking-command-1
12531                    mark (car lway) lway name)))
12532         (setq func (eval func))
12533         (define-key map (nth 4 lway) func)))))
12534
12535 (defun gnus-summary-make-marking-command-1 (mark way lway name)
12536   `(defun ,(intern
12537             (format "gnus-summary-put-mark-as-%s%s"
12538                     name (if (eq way 'nomove)
12539                              ""
12540                            (concat "-" (symbol-name way)))))
12541      (n)
12542      ,(format
12543        "Mark the current article as %s%s.
12544 If N, the prefix, then repeat N times.
12545 If N is negative, move in reverse order.
12546 The difference between N and the actual number of articles marked is
12547 returned."
12548        name (cadr lway))
12549      (interactive "p")
12550      (gnus-summary-generic-mark n ,mark ',(nth 2 lway) ,(nth 3 lway))))
12551
12552 (defun gnus-summary-generic-mark (n mark move unread)
12553   "Mark N articles with MARK."
12554   (unless (eq major-mode 'gnus-summary-mode)
12555     (error "This command can only be used in the summary buffer"))
12556   (gnus-summary-show-thread)
12557   (let ((nummove
12558          (cond
12559           ((eq move 'next) 1)
12560           ((eq move 'prev) -1)
12561           (t 0))))
12562     (if (zerop nummove)
12563         (setq n 1)
12564       (when (< n 0)
12565         (setq n (abs n)
12566               nummove (* -1 nummove))))
12567     (while (and (> n 0)
12568                 (gnus-summary-mark-article nil mark)
12569                 (zerop (gnus-summary-next-subject nummove unread t)))
12570       (setq n (1- n)))
12571     (when (/= 0 n)
12572       (gnus-message 7 "No more %sarticles" (if mark "" "unread ")))
12573     (gnus-summary-recenter)
12574     (gnus-summary-position-point)
12575     (gnus-set-mode-line 'summary)
12576     n))
12577
12578 (defun gnus-summary-insert-articles (articles)
12579   (when (setq articles
12580               (gnus-sorted-difference articles
12581                                       (mapcar (lambda (h)
12582                                                 (mail-header-number h))
12583                                               gnus-newsgroup-headers)))
12584     (setq gnus-newsgroup-headers
12585           (gnus-merge 'list
12586                       gnus-newsgroup-headers
12587                       (gnus-fetch-headers articles)
12588                       'gnus-article-sort-by-number))
12589     ;; Suppress duplicates?
12590     (when gnus-suppress-duplicates
12591       (gnus-dup-suppress-articles))
12592
12593     (if (and gnus-fetch-old-headers
12594              (eq gnus-headers-retrieved-by 'nov))
12595         ;; We might want to build some more threads first.
12596         (if (eq gnus-fetch-old-headers 'invisible)
12597             (gnus-build-all-threads)
12598           (gnus-build-old-threads))
12599       ;; Mark the inserted articles that are unread as unread.
12600       (setq gnus-newsgroup-unreads
12601             (gnus-sorted-nunion
12602              gnus-newsgroup-unreads
12603              (gnus-sorted-nintersection
12604               (gnus-list-of-unread-articles gnus-newsgroup-name)
12605               articles)))
12606       ;; Mark the inserted articles as selected so that the information
12607       ;; of the marks having been changed by a user may be updated when
12608       ;; exiting this group.  See `gnus-summary-update-info'.
12609       (dolist (art articles)
12610         (setq gnus-newsgroup-unselected (delq art gnus-newsgroup-unselected))))
12611     ;; Let the Gnus agent mark articles as read.
12612     (when gnus-agent
12613       (gnus-agent-get-undownloaded-list))
12614     ;; Remove list identifiers from subject
12615     (when gnus-list-identifiers
12616       (gnus-summary-remove-list-identifiers))
12617     ;; First and last article in this newsgroup.
12618     (when gnus-newsgroup-headers
12619       (setq gnus-newsgroup-begin
12620             (mail-header-number (car gnus-newsgroup-headers))
12621             gnus-newsgroup-end
12622             (mail-header-number
12623              (gnus-last-element gnus-newsgroup-headers))))
12624     (when gnus-use-scoring
12625       (gnus-possibly-score-headers))))
12626
12627 (defun gnus-summary-insert-old-articles (&optional all)
12628   "Insert all old articles in this group.
12629 If ALL is non-nil, already read articles become readable.
12630 If ALL is a number, fetch this number of articles."
12631   (interactive "P")
12632   (prog1
12633       (let ((old (sort (mapcar 'car gnus-newsgroup-data) '<))
12634             older len)
12635         (setq older
12636               ;; Some nntp servers lie about their active range.  When
12637               ;; this happens, the active range can be in the millions.
12638               ;; Use a compressed range to avoid creating a huge list.
12639               (gnus-range-difference (list gnus-newsgroup-active) old))
12640         (setq len (gnus-range-length older))
12641         (cond
12642          ((null older) nil)
12643          ((numberp all)
12644           (if (< all len)
12645               (let ((older-range (nreverse older)))
12646                 (setq older nil)
12647
12648                 (while (> all 0)
12649                   (let* ((r (pop older-range))
12650                          (min (if (numberp r) r (car r)))
12651                          (max (if (numberp r) r (cdr r))))
12652                     (while (and (<= min max)
12653                                 (> all 0))
12654                       (push max older)
12655                       (setq all (1- all)
12656                             max (1- max))))))
12657             (setq older (gnus-uncompress-range older))))
12658          (all
12659           (setq older (gnus-uncompress-range older)))
12660          (t
12661           (when (and (numberp gnus-large-newsgroup)
12662                    (> len gnus-large-newsgroup))
12663               (let* ((cursor-in-echo-area nil)
12664                      (initial (gnus-parameter-large-newsgroup-initial
12665                                gnus-newsgroup-name))
12666                      (input
12667                       (read-string
12668                        (format
12669                         "How many articles from %s (%s %d): "
12670                         (gnus-group-decoded-name gnus-newsgroup-name)
12671                         (if initial "max" "default")
12672                         len)
12673                        (if initial
12674                            (cons (number-to-string initial)
12675                                  0)))))
12676                 (unless (string-match "^[ \t]*$" input)
12677                   (setq all (string-to-number input))
12678                   (if (< all len)
12679                       (let ((older-range (nreverse older)))
12680                         (setq older nil)
12681
12682                         (while (> all 0)
12683                           (let* ((r (pop older-range))
12684                                  (min (if (numberp r) r (car r)))
12685                                  (max (if (numberp r) r (cdr r))))
12686                             (while (and (<= min max)
12687                                         (> all 0))
12688                               (push max older)
12689                               (setq all (1- all)
12690                                     max (1- max))))))))))
12691           (setq older (gnus-uncompress-range older))))
12692         (if (not older)
12693             (message "No old news.")
12694           (gnus-summary-insert-articles older)
12695           (gnus-summary-limit (gnus-sorted-nunion old older))))
12696     (gnus-summary-position-point)))
12697
12698 (defun gnus-summary-insert-new-articles ()
12699   "Insert all new articles in this group."
12700   (interactive)
12701   (prog1
12702       (let ((old (sort (mapcar 'car gnus-newsgroup-data) '<))
12703             (old-high gnus-newsgroup-highest)
12704             (nnmail-fetched-sources (list t))
12705             i new)
12706         (setq gnus-newsgroup-active
12707               (gnus-copy-sequence
12708                (gnus-activate-group gnus-newsgroup-name 'scan)))
12709         (setq i (cdr gnus-newsgroup-active)
12710               gnus-newsgroup-highest i)
12711         (while (> i old-high)
12712           (push i new)
12713           (decf i))
12714         (if (not new)
12715             (message "No gnus is bad news")
12716           (gnus-summary-insert-articles new)
12717           (setq gnus-newsgroup-unreads
12718                 (gnus-sorted-nunion gnus-newsgroup-unreads new))
12719           (gnus-summary-limit (gnus-sorted-nunion old new))))
12720     (gnus-summary-position-point)))
12721
12722 ;;; Bookmark support for Gnus.
12723 (declare-function bookmark-make-record-default
12724                   "bookmark" (&optional no-file no-context posn))
12725 (declare-function bookmark-prop-get "bookmark" (bookmark prop))
12726 (declare-function bookmark-default-handler "bookmark" (bmk))
12727 (declare-function bookmark-get-bookmark-record "bookmark" (bmk))
12728 (defvar bookmark-yank-point)
12729 (defvar bookmark-current-buffer)
12730
12731 (defun gnus-summary-bookmark-make-record ()
12732   "Make a bookmark entry for a Gnus summary buffer."
12733   (let (pos buf)
12734     (unless (and (derived-mode-p 'gnus-summary-mode) gnus-article-current)
12735       (save-restriction              ; FIXME is it necessary to widen?
12736         (widen) (setq pos (point))) ; Set position in gnus-article buffer.
12737       (setq buf "art") ; We are recording bookmark from article buffer.
12738       (setq bookmark-yank-point (point))
12739       (setq bookmark-current-buffer (current-buffer))
12740       (gnus-article-show-summary))      ; Go back in summary buffer.
12741     ;; We are now recording bookmark from summary buffer.
12742     (unless buf (setq buf "sum"))
12743     (let* ((subject (elt (gnus-summary-article-header) 1))
12744            (grp     (car gnus-article-current))
12745            (art     (cdr gnus-article-current))
12746            (head    (gnus-summary-article-header art))
12747            (id      (mail-header-id head)))
12748       `(,subject
12749         ,@(condition-case nil
12750               (bookmark-make-record-default 'no-file 'no-context pos)
12751             (wrong-number-of-arguments
12752              (bookmark-make-record-default 'point-only)))
12753         (location . ,(format "Gnus-%s %s:%d:%s" buf grp art id))
12754         (group . ,grp) (article . ,art)
12755         (message-id . ,id) (handler . gnus-summary-bookmark-jump)))))
12756
12757 ;;;###autoload
12758 (defun gnus-summary-bookmark-jump (bookmark)
12759   "Handler function for record returned by `gnus-summary-bookmark-make-record'.
12760 BOOKMARK is a bookmark name or a bookmark record."
12761   (let ((group    (bookmark-prop-get bookmark 'group))
12762         (article  (bookmark-prop-get bookmark 'article))
12763         (id       (bookmark-prop-get bookmark 'message-id))
12764         (buf      (car (split-string (bookmark-prop-get bookmark 'location)))))
12765     (gnus-fetch-group group (list article))
12766     (gnus-summary-insert-cached-articles)
12767     (gnus-summary-goto-article id nil 'force)
12768     ;; FIXME we have to wait article buffer is ready (only large buffer)
12769     ;; Is there a better solution to know that?
12770     ;; If we don't wait `bookmark-default-handler' will have no chance
12771     ;; to set position. However there is no error, just wrong pos.
12772     (sit-for 1)
12773     (when (string= buf "Gnus-art")
12774       (other-window 1))
12775     (bookmark-default-handler
12776      `(""
12777        (buffer . ,(current-buffer))
12778        . ,(bookmark-get-bookmark-record bookmark)))))
12779
12780 (gnus-summary-make-all-marking-commands)
12781
12782 (gnus-ems-redefine)
12783
12784 (provide 'gnus-sum)
12785
12786 (run-hooks 'gnus-sum-load-hook)
12787
12788 ;; Local Variables:
12789 ;; coding: iso-8859-1
12790 ;; End:
12791
12792 ;;; gnus-sum.el ends here