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;;; gnus-sum.el --- summary mode commands for Gnus
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;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
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;;   2005, 2006, 2007, 2008 Free Software Foundation, Inc.
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;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
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;; Keywords: news

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 3, or (at your option)
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;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
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;;; Commentary:

;;; Code:

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(eval-when-compile
  (require 'cl)
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  (defvar tool-bar-mode))
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(require 'gnus)
(require 'gnus-group)
(require 'gnus-spec)
(require 'gnus-range)
(require 'gnus-int)
(require 'gnus-undo)
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(require 'gnus-util)
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(require 'gmm-utils)
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(require 'mm-decode)
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(require 'nnoo)
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(autoload 'gnus-summary-limit-include-cached "gnus-cache" nil t)
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(autoload 'gnus-cache-write-active "gnus-cache")
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(autoload 'gnus-mailing-list-insinuate "gnus-ml" nil t)
(autoload 'turn-on-gnus-mailing-list-mode "gnus-ml" nil t)
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(autoload 'gnus-pick-line-number "gnus-salt" nil t)
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(autoload 'mm-uu-dissect "mm-uu")
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(autoload 'gnus-article-outlook-deuglify-article "deuglify"
  "Deuglify broken Outlook (Express) articles and redisplay."
  t)
(autoload 'gnus-article-outlook-unwrap-lines "deuglify" nil t)
(autoload 'gnus-article-outlook-repair-attribution "deuglify" nil t)
(autoload 'gnus-article-outlook-rearrange-citation "deuglify" nil t)
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(defcustom gnus-kill-summary-on-exit t
  "*If non-nil, kill the summary buffer when you exit from it.
If nil, the summary will become a \"*Dead Summary*\" buffer, and
it will be killed sometime later."
  :group 'gnus-summary-exit
  :type 'boolean)

(defcustom gnus-fetch-old-headers nil
  "*Non-nil means that Gnus will try to build threads by grabbing old headers.
If an unread article in the group refers to an older, already read (or
just marked as read) article, the old article will not normally be
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displayed in the Summary buffer.  If this variable is t, Gnus
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will attempt to grab the headers to the old articles, and thereby
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build complete threads.  If it has the value `some', only enough
headers to connect otherwise loose threads will be displayed.  This
variable can also be a number.  In that case, no more than that number
of old headers will be fetched.  If it has the value `invisible', all
old headers will be fetched, but none will be displayed.
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The server has to support NOV for any of this to work."
  :group 'gnus-thread
  :type '(choice (const :tag "off" nil)
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		 (const :tag "on" t)
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		 (const some)
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		 (const invisible)
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		 number
		 (sexp :menu-tag "other" t)))

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(defcustom gnus-refer-thread-limit 200
  "*The number of old headers to fetch when doing \\<gnus-summary-mode-map>\\[gnus-summary-refer-thread].
If t, fetch all the available old headers."
  :group 'gnus-thread
  :type '(choice number
		 (sexp :menu-tag "other" t)))

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(defcustom gnus-summary-make-false-root 'adopt
  "*nil means that Gnus won't gather loose threads.
If the root of a thread has expired or been read in a previous
session, the information necessary to build a complete thread has been
lost.  Instead of having many small sub-threads from this original thread
scattered all over the summary buffer, Gnus can gather them.

If non-nil, Gnus will try to gather all loose sub-threads from an
original thread into one large thread.

If this variable is non-nil, it should be one of `none', `adopt',
`dummy' or `empty'.

If this variable is `none', Gnus will not make a false root, but just
present the sub-threads after another.
If this variable is `dummy', Gnus will create a dummy root that will
have all the sub-threads as children.
If this variable is `adopt', Gnus will make one of the \"children\"
the parent and mark all the step-children as such.
If this variable is `empty', the \"children\" are printed with empty
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subject fields.  (Or rather, they will be printed with a string
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given by the `gnus-summary-same-subject' variable.)"
  :group 'gnus-thread
  :type '(choice (const :tag "off" nil)
		 (const none)
		 (const dummy)
		 (const adopt)
		 (const empty)))

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(defcustom gnus-summary-make-false-root-always nil
  "Always make a false dummy root."
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  :version "22.1"
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  :group 'gnus-thread
  :type 'boolean)

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(defcustom gnus-summary-gather-exclude-subject "^ *$\\|^(none)$"
  "*A regexp to match subjects to be excluded from loose thread gathering.
As loose thread gathering is done on subjects only, that means that
there can be many false gatherings performed.  By rooting out certain
common subjects, gathering might become saner."
  :group 'gnus-thread
  :type 'regexp)

(defcustom gnus-summary-gather-subject-limit nil
  "*Maximum length of subject comparisons when gathering loose threads.
Use nil to compare full subjects.  Setting this variable to a low
number will help gather threads that have been corrupted by
newsreaders chopping off subject lines, but it might also mean that
unrelated articles that have subject that happen to begin with the
same few characters will be incorrectly gathered.

If this variable is `fuzzy', Gnus will use a fuzzy algorithm when
comparing subjects."
  :group 'gnus-thread
  :type '(choice (const :tag "off" nil)
		 (const fuzzy)
		 (sexp :menu-tag "on" t)))

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(defcustom gnus-simplify-subject-functions nil
  "List of functions taking a string argument that simplify subjects.
The functions are applied recursively.

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Useful functions to put in this list include:
`gnus-simplify-subject-re', `gnus-simplify-subject-fuzzy',
`gnus-simplify-whitespace', and `gnus-simplify-all-whitespace'."
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  :group 'gnus-thread
  :type '(repeat function))

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(defcustom gnus-simplify-ignored-prefixes nil
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  "*Remove matches for this regexp from subject lines when simplifying fuzzily."
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  :group 'gnus-thread
  :type '(choice (const :tag "off" nil)
		 regexp))

(defcustom gnus-build-sparse-threads nil
  "*If non-nil, fill in the gaps in threads.
If `some', only fill in the gaps that are needed to tie loose threads
together.  If `more', fill in all leaf nodes that Gnus can find.  If
non-nil and non-`some', fill in all gaps that Gnus manages to guess."
  :group 'gnus-thread
  :type '(choice (const :tag "off" nil)
		 (const some)
		 (const more)
		 (sexp :menu-tag "all" t)))

(defcustom gnus-summary-thread-gathering-function
  'gnus-gather-threads-by-subject
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  "*Function used for gathering loose threads.
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There are two pre-defined functions: `gnus-gather-threads-by-subject',
which only takes Subjects into consideration; and
`gnus-gather-threads-by-references', which compared the References
headers of the articles to find matches."
  :group 'gnus-thread
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  :type '(radio (function-item gnus-gather-threads-by-subject)
		(function-item gnus-gather-threads-by-references)
		(function :tag "other")))
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(defcustom gnus-summary-same-subject ""
  "*String indicating that the current article has the same subject as the previous.
This variable will only be used if the value of
`gnus-summary-make-false-root' is `empty'."
  :group 'gnus-summary-format
  :type 'string)

(defcustom gnus-summary-goto-unread t
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  "*If t, many commands will go to the next unread article.
This applies to marking commands as well as other commands that
\"naturally\" select the next article, like, for instance, `SPC' at
the end of an article.

If nil, the marking commands do NOT go to the next unread article
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\(they go to the next article instead).  If `never', commands that
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usually go to the next unread article, will go to the next article,
whether it is read or not."
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  :group 'gnus-summary-marks
  :link '(custom-manual "(gnus)Setting Marks")
  :type '(choice (const :tag "off" nil)
		 (const never)
		 (sexp :menu-tag "on" t)))

(defcustom gnus-summary-default-score 0
  "*Default article score level.
All scores generated by the score files will be added to this score.
If this variable is nil, scoring will be disabled."
  :group 'gnus-score-default
  :type '(choice (const :tag "disable")
		 integer))

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(defcustom gnus-summary-default-high-score 0
  "*Default threshold for a high scored article.
An article will be highlighted as high scored if its score is greater
than this score."
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  :version "22.1"
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  :group 'gnus-score-default
  :type 'integer)

(defcustom gnus-summary-default-low-score 0
  "*Default threshold for a low scored article.
An article will be highlighted as low scored if its score is smaller
than this score."
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  :version "22.1"
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  :group 'gnus-score-default
  :type 'integer)

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(defcustom gnus-summary-zcore-fuzz 0
  "*Fuzziness factor for the zcore in the summary buffer.
Articles with scores closer than this to `gnus-summary-default-score'
will not be marked."
  :group 'gnus-summary-format
  :type 'integer)

(defcustom gnus-simplify-subject-fuzzy-regexp nil
  "*Strings to be removed when doing fuzzy matches.
This can either be a regular expression or list of regular expressions
that will be removed from subject strings if fuzzy subject
simplification is selected."
  :group 'gnus-thread
  :type '(repeat regexp))

(defcustom gnus-show-threads t
  "*If non-nil, display threads in summary mode."
  :group 'gnus-thread
  :type 'boolean)

(defcustom gnus-thread-hide-subtree nil
  "*If non-nil, hide all threads initially.
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This can be a predicate specifier which says which threads to hide.
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If threads are hidden, you have to run the command
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`gnus-summary-show-thread' by hand or select an article."
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  :group 'gnus-thread
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  :type '(radio (sexp :format "Non-nil\n"
		      :match (lambda (widget value)
			       (not (or (consp value) (functionp value))))
		      :value t)
		(const nil)
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		(sexp :tag "Predicate specifier")))
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(defcustom gnus-thread-hide-killed t
  "*If non-nil, hide killed threads automatically."
  :group 'gnus-thread
  :type 'boolean)

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(defcustom gnus-thread-ignore-subject t
  "*If non-nil, which is the default, ignore subjects and do all threading based on the Reference header.
If nil, articles that have different subjects from their parents will
start separate threads."
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  :group 'gnus-thread
  :type 'boolean)

(defcustom gnus-thread-operation-ignore-subject t
  "*If non-nil, subjects will be ignored when doing thread commands.
This affects commands like `gnus-summary-kill-thread' and
`gnus-summary-lower-thread'.

If this variable is nil, articles in the same thread with different
subjects will not be included in the operation in question.  If this
variable is `fuzzy', only articles that have subjects that are fuzzily
equal will be included."
  :group 'gnus-thread
  :type '(choice (const :tag "off" nil)
		 (const fuzzy)
		 (sexp :tag "on" t)))

(defcustom gnus-thread-indent-level 4
  "*Number that says how much each sub-thread should be indented."
  :group 'gnus-thread
  :type 'integer)

(defcustom gnus-auto-extend-newsgroup t
  "*If non-nil, extend newsgroup forward and backward when requested."
  :group 'gnus-summary-choose
  :type 'boolean)

(defcustom gnus-auto-select-first t
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  "If non-nil, select an article on group entry.
An article is selected automatically when entering a group
e.g. with \\<gnus-group-mode-map>\\[gnus-group-read-group], or via `gnus-summary-next-page' or
`gnus-summary-catchup-and-goto-next-group'.

Which article is selected is controlled by the variable
`gnus-auto-select-subject'.
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If you want to prevent automatic selection of articles in some
newsgroups, set the variable to nil in `gnus-select-group-hook'."
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  ;; Commands include...
  ;; \\<gnus-group-mode-map>\\[gnus-group-read-group]
  ;; \\<gnus-summary-mode-map>\\[gnus-summary-next-page]
  ;; \\<gnus-summary-mode-map>\\[gnus-summary-catchup-and-goto-next-group]
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  :group 'gnus-group-select
  :type '(choice (const :tag "none" nil)
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		 (sexp :menu-tag "first" t)))

(defcustom gnus-auto-select-subject 'unread
  "*Says what subject to place under point when entering a group.

This variable can either be the symbols `first' (place point on the
first subject), `unread' (place point on the subject line of the first
unread article), `best' (place point on the subject line of the
higest-scored article), `unseen' (place point on the subject line of
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the first unseen article), `unseen-or-unread' (place point on the subject
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line of the first unseen article or, if all article have been seen, on the
subject line of the first unread article), or a function to be called to
place point on some subject line."
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  :version "22.1"
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  :group 'gnus-group-select
  :type '(choice (const best)
		 (const unread)
		 (const first)
		 (const unseen)
	         (const unseen-or-unread)))
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(defcustom gnus-auto-select-next t
  "*If non-nil, offer to go to the next group from the end of the previous.
If the value is t and the next newsgroup is empty, Gnus will exit
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summary mode and go back to group mode.  If the value is neither nil
nor t, Gnus will select the following unread newsgroup.  In
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particular, if the value is the symbol `quietly', the next unread
newsgroup will be selected without any confirmation, and if it is
`almost-quietly', the next group will be selected without any
confirmation if you are located on the last article in the group.
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Finally, if this variable is `slightly-quietly', the `\\<gnus-summary-mode-map>\\[gnus-summary-catchup-and-goto-next-group]' command
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will go to the next group without confirmation."
  :group 'gnus-summary-maneuvering
  :type '(choice (const :tag "off" nil)
		 (const quietly)
		 (const almost-quietly)
		 (const slightly-quietly)
		 (sexp :menu-tag "on" t)))

(defcustom gnus-auto-select-same nil
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  "*If non-nil, select the next article with the same subject.
If there are no more articles with the same subject, go to
the first unread article."
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  :group 'gnus-summary-maneuvering
  :type 'boolean)

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(defcustom gnus-auto-goto-ignores 'unfetched
  "*Says how to handle unfetched articles when maneuvering.

This variable can either be the symbols nil (maneuver to any
article), `undownloaded' (maneuvering while unplugged ignores articles
that have not been fetched), `always-undownloaded' (maneuvering always
ignores articles that have not been fetched), `unfetched' (maneuvering
ignores articles whose headers have not been fetched).

NOTE: The list of unfetched articles will always be nil when plugged
and, when unplugged, a subset of the undownloaded article list."
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  :version "22.1"
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  :group 'gnus-summary-maneuvering
  :type '(choice (const :tag "None" nil)
                 (const :tag "Undownloaded when unplugged" undownloaded)
                 (const :tag "Undownloaded" always-undownloaded)
                 (const :tag "Unfetched" unfetched)))

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(defcustom gnus-summary-check-current nil
  "*If non-nil, consider the current article when moving.
The \"unread\" movement commands will stay on the same line if the
current article is unread."
  :group 'gnus-summary-maneuvering
  :type 'boolean)

(defcustom gnus-auto-center-summary t
  "*If non-nil, always center the current summary buffer.
In particular, if `vertical' do only vertical recentering.  If non-nil
and non-`vertical', do both horizontal and vertical recentering."
  :group 'gnus-summary-maneuvering
  :type '(choice (const :tag "none" nil)
		 (const vertical)
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		 (integer :tag "height")
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		 (sexp :menu-tag "both" t)))

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(defvar gnus-auto-center-group t
  "*If non-nil, always center the group buffer.")

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(defcustom gnus-show-all-headers nil
  "*If non-nil, don't hide any headers."
  :group 'gnus-article-hiding
  :group 'gnus-article-headers
  :type 'boolean)

(defcustom gnus-summary-ignore-duplicates nil
  "*If non-nil, ignore articles with identical Message-ID headers."
  :group 'gnus-summary
  :type 'boolean)
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(defcustom gnus-single-article-buffer t
  "*If non-nil, display all articles in the same buffer.
If nil, each group will get its own article buffer."
  :group 'gnus-article-various
  :type 'boolean)

(defcustom gnus-break-pages t
  "*If non-nil, do page breaking on articles.
The page delimiter is specified by the `gnus-page-delimiter'
variable."
  :group 'gnus-article-various
  :type 'boolean)

(defcustom gnus-move-split-methods nil
  "*Variable used to suggest where articles are to be moved to.
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It uses the same syntax as the `gnus-split-methods' variable.
However, whereas `gnus-split-methods' specifies file names as targets,
this variable specifies group names."
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  :group 'gnus-summary-mail
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  :type '(repeat (choice (list :value (fun) function)
			 (cons :value ("" "") regexp (repeat string))
			 (sexp :value nil))))
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;; FIXME: Although the custom type is `character' for the following variables,
;; using multibyte characters (Latin-1, UTF-8) doesn't work.  -- rs

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(defcustom gnus-unread-mark ?           ;Whitespace
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  "*Mark used for unread articles."
  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-ticked-mark ?!
  "*Mark used for ticked articles."
  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-dormant-mark ??
  "*Mark used for dormant articles."
  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-del-mark ?r
  "*Mark used for del'd articles."
  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-read-mark ?R
  "*Mark used for read articles."
  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-expirable-mark ?E
  "*Mark used for expirable articles."
  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-killed-mark ?K
  "*Mark used for killed articles."
  :group 'gnus-summary-marks
  :type 'character)

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(defcustom gnus-spam-mark ?$
  "*Mark used for spam articles."
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  :version "22.1"
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  :group 'gnus-summary-marks
  :type 'character)

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(defcustom gnus-souped-mark ?F
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  "*Mark used for souped articles."
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  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-kill-file-mark ?X
  "*Mark used for articles killed by kill files."
  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-low-score-mark ?Y
  "*Mark used for articles with a low score."
  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-catchup-mark ?C
  "*Mark used for articles that are caught up."
  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-replied-mark ?A
  "*Mark used for articles that have been replied to."
  :group 'gnus-summary-marks
  :type 'character)

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(defcustom gnus-forwarded-mark ?F
  "*Mark used for articles that have been forwarded."
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  :version "22.1"
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  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-recent-mark ?N
  "*Mark used for articles that are recent."
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  :version "22.1"
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  :group 'gnus-summary-marks
  :type 'character)

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(defcustom gnus-cached-mark ?*
  "*Mark used for articles that are in the cache."
  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-saved-mark ?S
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  "*Mark used for articles that have been saved."
  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-unseen-mark ?.
  "*Mark used for articles that haven't been seen."
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  :version "22.1"
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  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-no-mark ?               ;Whitespace
  "*Mark used for articles that have no other secondary mark."
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  :version "22.1"
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  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-ancient-mark ?O
  "*Mark used for ancient articles."
  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-sparse-mark ?Q
  "*Mark used for sparsely reffed articles."
  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-canceled-mark ?G
  "*Mark used for canceled articles."
  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-duplicate-mark ?M
  "*Mark used for duplicate articles."
  :group 'gnus-summary-marks
  :type 'character)

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(defcustom gnus-undownloaded-mark ?-
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  "*Mark used for articles that weren't downloaded."
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  :version "22.1"
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  :group 'gnus-summary-marks
  :type 'character)

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(defcustom gnus-downloaded-mark ?+
  "*Mark used for articles that were downloaded."
  :group 'gnus-summary-marks
  :type 'character)

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(defcustom gnus-downloadable-mark ?%
  "*Mark used for articles that are to be downloaded."
  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-unsendable-mark ?=
  "*Mark used for articles that won't be sent."
  :group 'gnus-summary-marks
  :type 'character)

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(defcustom gnus-score-over-mark ?+
  "*Score mark used for articles with high scores."
  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-score-below-mark ?-
  "*Score mark used for articles with low scores."
  :group 'gnus-summary-marks
  :type 'character)

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(defcustom gnus-empty-thread-mark ?     ;Whitespace
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  "*There is no thread under the article."
  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-not-empty-thread-mark ?=
  "*There is a thread under the article."
  :group 'gnus-summary-marks
  :type 'character)

(defcustom gnus-view-pseudo-asynchronously nil
  "*If non-nil, Gnus will view pseudo-articles asynchronously."
  :group 'gnus-extract-view
  :type 'boolean)

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(defcustom gnus-auto-expirable-marks
  (list gnus-killed-mark gnus-del-mark gnus-catchup-mark
	gnus-low-score-mark gnus-ancient-mark gnus-read-mark
	gnus-souped-mark gnus-duplicate-mark)
  "*The list of marks converted into expiration if a group is auto-expirable."
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  :version "21.1"
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  :group 'gnus-summary
  :type '(repeat character))

(defcustom gnus-inhibit-user-auto-expire t
  "*If non-nil, user marking commands will not mark an article as expirable, even if the group has auto-expire turned on."
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  :version "21.1"
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  :group 'gnus-summary
  :type 'boolean)

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(defcustom gnus-view-pseudos nil
  "*If `automatic', pseudo-articles will be viewed automatically.
If `not-confirm', pseudos will be viewed automatically, and the user
will not be asked to confirm the command."
  :group 'gnus-extract-view
  :type '(choice (const :tag "off" nil)
		 (const automatic)
		 (const not-confirm)))

(defcustom gnus-view-pseudos-separately t
  "*If non-nil, one pseudo-article will be created for each file to be viewed.
If nil, all files that use the same viewing command will be given as a
list of parameters to that command."
  :group 'gnus-extract-view
  :type 'boolean)

(defcustom gnus-insert-pseudo-articles t
  "*If non-nil, insert pseudo-articles when decoding articles."
  :group 'gnus-extract-view
  :type 'boolean)

(defcustom gnus-summary-dummy-line-format
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  "   %(:                             :%) %S\n"
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  "*The format specification for the dummy roots in the summary buffer.
It works along the same lines as a normal formatting string,
with some simple extensions.

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%S  The subject

General format specifiers can also be used.
See `(gnus)Formatting Variables'."
  :link '(custom-manual "(gnus)Formatting Variables")
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  :group 'gnus-threading
  :type 'string)

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(defcustom gnus-summary-mode-line-format "Gnus: %g [%A] %Z"
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  "*The format specification for the summary mode line.
It works along the same lines as a normal formatting string,
with some simple extensions:

%G  Group name
%p  Unprefixed group name
%A  Current article number
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%z  Current article score
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%V  Gnus version
%U  Number of unread articles in the group
%e  Number of unselected articles in the group
%Z  A string with unread/unselected article counts
%g  Shortish group name
%S  Subject of the current article
%u  User-defined spec
%s  Current score file name
%d  Number of dormant articles
%r  Number of articles that have been marked as read in this session
%E  Number of articles expunged by the score files"
  :group 'gnus-summary-format
  :type 'string)

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(defcustom gnus-list-identifiers nil
  "Regexp that matches list identifiers to be removed from subject.
This can also be a list of regexps."
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  :version "21.1"
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  :group 'gnus-summary-format
  :group 'gnus-article-hiding
  :type '(choice (const :tag "none" nil)
		 (regexp :value ".*")
		 (repeat :value (".*") regexp)))

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(defcustom gnus-summary-mark-below 0
  "*Mark all articles with a score below this variable as read.
This variable is local to each summary buffer and usually set by the
score file."
  :group 'gnus-score-default
  :type 'integer)

(defcustom gnus-article-sort-functions '(gnus-article-sort-by-number)
  "*List of functions used for sorting articles in the summary buffer.
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Each function takes two articles and returns non-nil if the first
article should be sorted before the other.  If you use more than one
function, the primary sort function should be the last.  You should
probably always include `gnus-article-sort-by-number' in the list of
sorting functions -- preferably first.  Also note that sorting by date
is often much slower than sorting by number, and the sorting order is
very similar.  (Sorting by date means sorting by the time the message
was sent, sorting by number means sorting by arrival time.)

Ready-made functions include `gnus-article-sort-by-number',
`gnus-article-sort-by-author', `gnus-article-sort-by-subject',
`gnus-article-sort-by-date', `gnus-article-sort-by-random'
and `gnus-article-sort-by-score'.

When threading is turned on, the variable `gnus-thread-sort-functions'
controls how articles are sorted."
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  :group 'gnus-summary-sort
  :type '(repeat (choice (function-item gnus-article-sort-by-number)
			 (function-item gnus-article-sort-by-author)
			 (function-item gnus-article-sort-by-subject)
			 (function-item gnus-article-sort-by-date)
			 (function-item gnus-article-sort-by-score)
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			 (function-item gnus-article-sort-by-random)
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			 (function :tag "other"))))

(defcustom gnus-thread-sort-functions '(gnus-thread-sort-by-number)
  "*List of functions used for sorting threads in the summary buffer.
By default, threads are sorted by article number.

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Each function takes two threads and returns non-nil if the first
thread should be sorted before the other.  If you use more than one
function, the primary sort function should be the last.  You should
probably always include `gnus-thread-sort-by-number' in the list of
sorting functions -- preferably first.  Also note that sorting by date
is often much slower than sorting by number, and the sorting order is
very similar.  (Sorting by date means sorting by the time the message
was sent, sorting by number means sorting by arrival time.)
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Ready-made functions include `gnus-thread-sort-by-number',
`gnus-thread-sort-by-author', `gnus-thread-sort-by-subject',
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`gnus-thread-sort-by-date', `gnus-thread-sort-by-score',
`gnus-thread-sort-by-most-recent-number',
`gnus-thread-sort-by-most-recent-date',
`gnus-thread-sort-by-random', and
`gnus-thread-sort-by-total-score' (see `gnus-thread-score-function').

When threading is turned off, the variable
`gnus-article-sort-functions' controls how articles are sorted."
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  :group 'gnus-summary-sort
  :type '(repeat (choice (function-item gnus-thread-sort-by-number)
			 (function-item gnus-thread-sort-by-author)
			 (function-item gnus-thread-sort-by-subject)
			 (function-item gnus-thread-sort-by-date)
			 (function-item gnus-thread-sort-by-score)
			 (function-item gnus-thread-sort-by-total-score)
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			 (function-item gnus-thread-sort-by-random)
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			 (function :tag "other"))))

(defcustom gnus-thread-score-function '+
  "*Function used for calculating the total score of a thread.

The function is called with the scores of the article and each
subthread and should then return the score of the thread.

Some functions you can use are `+', `max', or `min'."
  :group 'gnus-summary-sort
  :type 'function)

(defcustom gnus-summary-expunge-below nil
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  "All articles that have a score less than this variable will be expunged.
This variable is local to the summary buffers."
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  :group 'gnus-score-default
  :type '(choice (const :tag "off" nil)
		 integer))

(defcustom gnus-thread-expunge-below nil
  "All threads that have a total score less than this variable will be expunged.
See `gnus-thread-score-function' for en explanation of what a
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\"thread score\" is.

This variable is local to the summary buffers."
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  :group 'gnus-threading
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  :group 'gnus-score-default
  :type '(choice (const :tag "off" nil)
		 integer))

(defcustom gnus-summary-mode-hook nil
  "*A hook for Gnus summary mode.
This hook is run before any variables are set in the summary buffer."
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  :options '(turn-on-gnus-mailing-list-mode gnus-pick-mode)
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  :group 'gnus-summary-various
  :type 'hook)

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;; Extracted from gnus-xmas-redefine in order to preserve user settings
(when (featurep 'xemacs)
  (add-hook 'gnus-summary-mode-hook 'gnus-xmas-summary-menu-add)
  (add-hook 'gnus-summary-mode-hook 'gnus-xmas-setup-summary-toolbar)
  (add-hook 'gnus-summary-mode-hook
	    'gnus-xmas-switch-horizontal-scrollbar-off))

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(defcustom gnus-summary-menu-hook nil
  "*Hook run after the creation of the summary mode menu."
  :group 'gnus-summary-visual
  :type 'hook)

(defcustom gnus-summary-exit-hook nil
  "*A hook called on exit from the summary buffer.
It will be called with point in the group buffer."
  :group 'gnus-summary-exit
  :type 'hook)

(defcustom gnus-summary-prepare-hook nil
  "*A hook called after the summary buffer has been generated.
If you want to modify the summary buffer, you can use this hook."
  :group 'gnus-summary-various
  :type 'hook)

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(defcustom gnus-summary-prepared-hook nil
  "*A hook called as the last thing after the summary buffer has been generated."
  :group 'gnus-summary-various
  :type 'hook)

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(defcustom gnus-summary-generate-hook nil
  "*A hook run just before generating the summary buffer.
This hook is commonly used to customize threading variables and the
like."
  :group 'gnus-summary-various
  :type 'hook)

(defcustom gnus-select-group-hook nil
  "*A hook called when a newsgroup is selected.

If you'd like to simplify subjects like the
`gnus-summary-next-same-subject' command does, you can use the
following hook:

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 (add-hook gnus-select-group-hook
	   (lambda ()
	     (mapcar (lambda (header)
		       (mail-header-set-subject
			header
			(gnus-simplify-subject
			 (mail-header-subject header) 're-only)))
		     gnus-newsgroup-headers)))"
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  :group 'gnus-group-select
  :type 'hook)

(defcustom gnus-select-article-hook nil
  "*A hook called when an article is selected."
  :group 'gnus-summary-choose
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  :options '(gnus-agent-fetch-selected-article)
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  :type 'hook)

(defcustom gnus-visual-mark-article-hook
  (list 'gnus-highlight-selected-summary)
  "*Hook run after selecting an article in the summary buffer.
It is meant to be used for highlighting the article in some way.  It
is not run if `gnus-visual' is nil."
  :group 'gnus-summary-visual
  :type 'hook)

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(defcustom gnus-parse-headers-hook nil
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  "*A hook called before parsing the headers."
  :group 'gnus-various
  :type 'hook)

(defcustom gnus-exit-group-hook nil
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  "*A hook called when exiting summary mode.
This hook is not called from the non-updating exit commands like `Q'."
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  :group 'gnus-various
  :type 'hook)

(defcustom gnus-summary-update-hook
  (list 'gnus-summary-highlight-line)
  "*A hook called when a summary line is changed.
The hook will not be called if `gnus-visual' is nil.

The default function `gnus-summary-highlight-line' will
highlight the line according to the `gnus-summary-highlight'
variable."
  :group 'gnus-summary-visual
  :type 'hook)

(defcustom gnus-mark-article-hook '(gnus-summary-mark-read-and-unread-as-read)
  "*A hook called when an article is selected for the first time.
The hook is intended to mark an article as read (or unread)
automatically when it is selected."
  :group 'gnus-summary-choose
  :type 'hook)

(defcustom gnus-group-no-more-groups-hook nil
  "*A hook run when returning to group mode having no more (unread) groups."
  :group 'gnus-group-select
  :type 'hook)

(defcustom gnus-ps-print-hook nil
  "*A hook run before ps-printing something from Gnus."
  :group 'gnus-summary
  :type 'hook)

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(defcustom gnus-summary-article-move-hook nil
  "*A hook called after an article is moved, copied, respooled, or crossposted."
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  :version "22.1"
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  :group 'gnus-summary
  :type 'hook)

(defcustom gnus-summary-article-delete-hook nil
  "*A hook called after an article is deleted."
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  :version "22.1"
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  :group 'gnus-summary
  :type 'hook)

(defcustom gnus-summary-article-expire-hook nil
  "*A hook called after an article is expired."
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  :version "22.1"
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  :group 'gnus-summary
  :type 'hook)

(defcustom gnus-summary-display-arrow
  (and (fboundp 'display-graphic-p)
       (display-graphic-p))
  "*If non-nil, display an arrow highlighting the current article."
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  :version "22.1"
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  :group 'gnus-summary
  :type 'boolean)

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(defcustom gnus-summary-selected-face 'gnus-summary-selected
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  "Face used for highlighting the current article in the summary buffer."
  :group 'gnus-summary-visual
  :type 'face)

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(defvar gnus-tmp-downloaded nil)

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(defcustom gnus-summary-highlight
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  '(((eq mark gnus-canceled-mark)
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     . gnus-summary-cancelled)
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    ((and uncached (> score default-high))
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     . gnus-summary-high-undownloaded)
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    ((and uncached (< score default-low))
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     . gnus-summary-low-undownloaded)
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    (uncached
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     . gnus-summary-normal-undownloaded)
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    ((and (> score default-high)
	  (or (eq mark gnus-dormant-mark)
	      (eq mark gnus-ticked-mark)))
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     . gnus-summary-high-ticked)
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    ((and (< score default-low)
	  (or (eq mark gnus-dormant-mark)
	      (eq mark gnus-ticked-mark)))
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     . gnus-summary-low-ticked)
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    ((or (eq mark gnus-dormant-mark)
	 (eq mark gnus-ticked-mark))
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     . gnus-summary-normal-ticked)
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    ((and (> score default-high) (eq mark gnus-ancient-mark))
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     . gnus-summary-high-ancient)
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    ((and (< score default-low) (eq mark gnus-ancient-mark))
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     . gnus-summary-low-ancient)
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    ((eq mark gnus-ancient-mark)
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     . gnus-summary-normal-ancient)
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    ((and (> score default-high) (eq mark gnus-unread-mark))
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     . gnus-summary-high-unread)
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    ((and (< score default-low) (eq mark gnus-unread-mark))
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     . gnus-summary-low-unread)
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    ((eq mark gnus-unread-mark)
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     . gnus-summary-normal-unread)
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    ((> score default-high)
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     . gnus-summary-high-read)
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    ((< score default-low)
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     . gnus-summary-low-read)
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    (t
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     . gnus-summary-normal-read))
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  "*Controls the highlighting of summary buffer lines.
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A list of (FORM . FACE) pairs.  When deciding how a particular
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summary line should be displayed, each form is evaluated.  The content
of the face field after the first true form is used.  You can change
how those summary lines are displayed, by editing the face field.
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You can use the following variables in the FORM field.

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score:        The article's score.
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default:      The default article score.
default-high: The default score for high scored articles.
default-low:  The default score for low scored articles.
below:        The score below which articles are automatically marked as read.
mark:         The article's mark.
uncached:     Non-nil if the article is uncached."
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  :group 'gnus-summary-visual
  :type '(repeat (cons (sexp :tag "Form" nil)
		       face)))
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(put 'gnus-summary-highlight 'risky-local-variable t)
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(defcustom gnus-alter-header-function nil
  "Function called to allow alteration of article header structures.
The function is called with one parameter, the article header vector,
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which it may alter in any way."
  :type '(choice (const :tag "None" nil)
		 function)
  :group 'gnus-summary)
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(defvar gnus-decode-encoded-word-function 'mail-decode-encoded-word-string
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  "Function used to decode a string with encoded words.")

(defvar gnus-decode-encoded-address-function
  'mail-decode-encoded-address-string
  "Function used to decode addresses with encoded words.")
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(defcustom gnus-extra-headers '(To Newsgroups)
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  "*Extra headers to parse."
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  :version "21.1"
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  :group 'gnus-summary
  :type '(repeat symbol))

(defcustom gnus-ignored-from-addresses
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  (and user-mail-address
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       (not (string= user-mail-address ""))
       (regexp-quote user-mail-address))
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  "*Regexp of From headers that may be suppressed in favor of To headers."
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  :version "21.1"
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  :group 'gnus-summary
  :type 'regexp)

(defcustom gnus-newsgroup-ignored-charsets '(unknown-8bit x-unknown)
  "List of charsets that should be ignored.
When these charsets are used in the \"charset\" parameter, the
default charset will be used instead."
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  :version "21.1"
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  :type '(repeat symbol)
  :group 'gnus-charset)

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(defcustom gnus-newsgroup-maximum-articles nil
  "The maximum number of articles a newsgroup.
If this is a number, old articles in a newsgroup exceeding this number
are silently ignored.  If it is nil, no article is ignored.  Note that
setting this variable to a number might prevent you from reading very
old articles."
  :group 'gnus-group-select
  :version "22.2"
  :type '(choice (const :tag "No limit" nil)
		 integer))

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(gnus-define-group-parameter
 ignored-charsets
 :type list
 :function-document
 "Return the ignored charsets of GROUP."
 :variable gnus-group-ignored-charsets-alist
 :variable-default
 '(("alt\\.chinese\\.text" iso-8859-1))
 :variable-document
 "Alist of regexps (to match group names) and charsets that should be ignored.
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When these charsets are used in the \"charset\" parameter, the
default charset will be used instead."
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 :variable-group gnus-charset
 :variable-type '(repeat (cons (regexp :tag "Group")
			       (repeat symbol)))
 :parameter-type '(choice :tag "Ignored charsets"
			  :value nil
			  (repeat (symbol)))
 :parameter-document       "\
List of charsets that should be ignored.

When these charsets are used in the \"charset\" parameter, the
default charset will be used instead.")
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(defcustom gnus-group-highlight-words-alist nil
  "Alist of group regexps and highlight regexps.
This variable uses the same syntax as `gnus-emphasis-alist'."
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  :version "21.1"
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  :type '(repeat (cons (regexp :tag "Group")
		       (repeat (list (regexp :tag "Highlight regexp")
				     (number :tag "Group for entire word" 0)
				     (number :tag "Group for displayed part" 0)
				     (symbol :tag "Face"
					     gnus-emphasis-highlight-words)))))
  :group 'gnus-summary-visual)

(defcustom gnus-summary-show-article-charset-alist
  nil
  "Alist of number and charset.
The article will be shown with the charset corresponding to the
numbered argument.
For example: ((1 . cn-gb-2312) (2 . big5))."
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  :version "21.1"
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  :type '(repeat (cons (number :tag "Argument" 1)
		       (symbol :tag "Charset")))
  :group 'gnus-charset)

(defcustom gnus-preserve-marks t
  "Whether marks are preserved when moving, copying and respooling messages."
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  :version "21.1"
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  :type 'boolean
  :group 'gnus-summary-marks)

(defcustom gnus-alter-articles-to-read-function nil
  "Function to be called to alter the list of articles to be selected."
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  :type '(choice (const nil) function)
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  :group 'gnus-summary)

(defcustom gnus-orphan-score nil
  "*All orphans get this score added.  Set in the score file."
  :group 'gnus-score-default
  :type '(choice (const nil)
		 integer))

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(defcustom gnus-summary-save-parts-default-mime "image/.*"
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  "*A regexp to match MIME parts when saving multiple parts of a
message with `gnus-summary-save-parts' (\\<gnus-summary-mode-map>\\[gnus-summary-save-parts]).
This regexp will be used by default when prompting the user for which
type of files to save."
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  :group 'gnus-summary
  :type 'regexp)

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(defcustom gnus-read-all-available-headers nil
  "Whether Gnus should parse all headers made available to it.
This is mostly relevant for slow back ends where the user may
wish to widen the summary buffer to include all headers
that were fetched.  Say, for nnultimate groups."
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  :version "22.1"
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  :group 'gnus-summary
  :type '(choice boolean regexp))

(defcustom gnus-summary-muttprint-program "muttprint"
  "Command (and optional arguments) used to run Muttprint."
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  :version "22.1"
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  :group 'gnus-summary
  :type 'string)

(defcustom gnus-article-loose-mime nil
  "If non-nil, don't require MIME-Version header.
Some brain-damaged MUA/MTA, e.g. Lotus Domino 5.0.6 clients, does not
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supply the MIME-Version header or deliberately strip it from the mail.
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Set it to non-nil, Gnus will treat some articles as MIME even if
the MIME-Version header is missed."
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  :version "22.1"
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  :type 'boolean
  :group 'gnus-article-mime)

(defcustom gnus-article-emulate-mime t
  "If non-nil, use MIME emulation for uuencode and the like.
This means that Gnus will search message bodies for text that look
like uuencoded bits, yEncoded bits, and so on, and present that using
the normal Gnus MIME machinery."
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  :version "22.1"
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  :type 'boolean
  :group 'gnus-article-mime)
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;;; Internal variables

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(defvar gnus-summary-display-cache nil)
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(defvar gnus-article-mime-handles nil)
(defvar gnus-article-decoded-p nil)
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(defvar gnus-article-charset nil)
(defvar gnus-article-ignored-charsets nil)
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(defvar gnus-scores-exclude-files nil)
(defvar gnus-page-broken nil)

(defvar gnus-original-article nil)
(defvar gnus-article-internal-prepare-hook nil)
(defvar gnus-newsgroup-process-stack nil)

(defvar gnus-thread-indent-array nil)
(defvar gnus-thread-indent-array-level gnus-thread-indent-level)
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(defvar gnus-sort-gathered-threads-function 'gnus-thread-sort-by-number
  "Function called to sort the articles within a thread after it has been gathered together.")
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(defvar gnus-summary-save-parts-type-history nil)
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(defvar gnus-summary-save-parts-last-directory mm-default-directory)
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;; Avoid highlighting in kill files.
(defvar gnus-summary-inhibit-highlight nil)
(defvar gnus-newsgroup-selected-overlay nil)
(defvar gnus-inhibit-limiting nil)
(defvar gnus-newsgroup-adaptive-score-file nil)
(defvar gnus-current-score-file nil)
(defvar gnus-current-move-group nil)
(defvar gnus-current-copy-group nil)
(defvar gnus-current-crosspost-group nil)
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(defvar gnus-newsgroup-display nil)
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(defvar gnus-newsgroup-dependencies nil)
(defvar gnus-newsgroup-adaptive nil)
(defvar gnus-summary-display-article-function nil)
(defvar gnus-summary-highlight-line-function nil
  "Function called after highlighting a summary line.")

(defvar gnus-summary-line-format-alist
  `((?N ,(macroexpand '(mail-header-number gnus-tmp-header)) ?d)
    (?S ,(macroexpand '(mail-header-subject gnus-tmp-header)) ?s)
    (?s gnus-tmp-subject-or-nil ?s)
    (?n gnus-tmp-name ?s)
    (?A (car (cdr (funcall gnus-extract-address-components gnus-tmp-from)))
	?s)
    (?a (or (car (funcall gnus-extract-address-components gnus-tmp-from))
	    gnus-tmp-from) ?s)
    (?F gnus-tmp-from ?s)
    (?x ,(macroexpand '(mail-header-xref gnus-tmp-header)) ?s)
    (?D ,(macroexpand '(mail-header-date gnus-tmp-header)) ?s)
    (?d (gnus-dd-mmm (mail-header-date gnus-tmp-header)) ?s)
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    (?o (gnus-date-iso8601 (mail-header-date gnus-tmp-header)) ?s)
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    (?M ,(macroexpand '(mail-header-id gnus-tmp-header)) ?s)
    (?r ,(macroexpand '(mail-header-references gnus-tmp-header)) ?s)
    (?c (or (mail-header-chars gnus-tmp-header) 0) ?d)
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    (?k (gnus-summary-line-message-size gnus-tmp-header) ?s)
    (?L gnus-tmp-lines ?s)
    (?O gnus-tmp-downloaded ?c)
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    (?I gnus-tmp-indentation ?s)
    (?T (if (= gnus-tmp-level 0) "" (make-string (frame-width) ? )) ?s)
    (?R gnus-tmp-replied ?c)
    (?\[ gnus-tmp-opening-bracket ?c)
    (?\] gnus-tmp-closing-bracket ?c)
    (?\> (make-string gnus-tmp-level ? ) ?s)
    (?\< (make-string (max 0 (- 20 gnus-tmp-level)) ? ) ?s)
    (?i gnus-tmp-score ?d)
    (?z gnus-tmp-score-char ?c)
    (?l (bbb-grouplens-score gnus-tmp-header) ?s)
    (?V (gnus-thread-total-score (and (boundp 'thread) (car thread))) ?d)
    (?U gnus-tmp-unread ?c)
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    (?f (gnus-summary-from-or-to-or-newsgroups gnus-tmp-header gnus-tmp-from)
	?s)
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    (?t (gnus-summary-number-of-articles-in-thread
	 (and (boundp 'thread) (car thread)) gnus-tmp-level)
	?d)
    (?e (gnus-summary-number-of-articles-in-thread
	 (and (boundp 'thread) (car thread)) gnus-tmp-level t)
	?c)
    (?u gnus-tmp-user-defined ?s)
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    (?P (gnus-pick-line-number) ?d)
    (?B gnus-tmp-thread-tree-header-string ?s)
    (user-date (gnus-user-date
		,(macroexpand '(mail-header-date gnus-tmp-header))) ?s))
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  "An alist of format specifications that can appear in summary lines.
These are paired with what variables they correspond with, along with
the type of the variable (string, integer, character, etc).")
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(defvar gnus-summary-dummy-line-format-alist
  `((?S gnus-tmp-subject ?s)
    (?N gnus-tmp-number ?d)
    (?u gnus-tmp-user-defined ?s)))

(defvar gnus-summary-mode-line-format-alist
  `((?G gnus-tmp-group-name ?s)
    (?g (gnus-short-group-name gnus-tmp-group-name) ?s)
    (?p (gnus-group-real-name gnus-tmp-group-name) ?s)
    (?A gnus-tmp-article-number ?d)
    (?Z gnus-tmp-unread-and-unselected ?s)
    (?V gnus-version ?s)
    (?U gnus-tmp-unread-and-unticked ?d)
    (?S gnus-tmp-subject ?s)
    (?e gnus-tmp-unselected ?d)
    (?u gnus-tmp-user-defined ?s)
    (?d (length gnus-newsgroup-dormant) ?d)
    (?t (length gnus-newsgroup-marked) ?d)
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    (?h (length gnus-newsgroup-spam-marked) ?d)
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    (?r (length gnus-newsgroup-reads) ?d)
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    (?z (gnus-summary-article-score gnus-tmp-article-number) ?d)
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    (?E gnus-newsgroup-expunged-tally ?d)
    (?s (gnus-current-score-file-nondirectory) ?s)))

(defvar gnus-last-search-regexp nil
  "Default regexp for article search command.")

(defvar gnus-last-shell-command nil
  "Default shell command on article.")

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(defvar gnus-newsgroup-agentized nil
  "Locally bound in each summary buffer to indicate whether the server has been agentized.")
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(defvar gnus-newsgroup-begin nil)
(defvar gnus-newsgroup-end nil)
(defvar gnus-newsgroup-last-rmail nil)
(defvar gnus-newsgroup-last-mail nil)
(defvar gnus-newsgroup-last-folder nil)
(defvar gnus-newsgroup-last-file nil)
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(defvar gnus-newsgroup-last-directory nil)
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(defvar gnus-newsgroup-auto-expire nil)
(defvar gnus-newsgroup-active nil)

(defvar gnus-newsgroup-data nil)
(defvar gnus-newsgroup-data-reverse nil)
(defvar gnus-newsgroup-limit nil)
(defvar gnus-newsgroup-limits nil)
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(defvar gnus-summary-use-undownloaded-faces nil)
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(defvar gnus-newsgroup-unreads nil
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  "Sorted list of unread articles in the current newsgroup.")
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(defvar gnus-newsgroup-unselected nil
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  "Sorted list of unselected unread articles in the current newsgroup.")
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(defvar gnus-newsgroup-reads nil
  "Alist of read articles and article marks in the current newsgroup.")

(defvar gnus-newsgroup-expunged-tally nil)

(defvar gnus-newsgroup-marked nil
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  "Sorted list of ticked articles in the current newsgroup (a subset of unread art).")

(defvar gnus-newsgroup-spam-marked nil
  "List of ranges of articles that have been marked as spam.")
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(defvar gnus-newsgroup-killed nil
  "List of ranges of articles that have been through the scoring process.")

(defvar gnus-newsgroup-cached nil
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  "Sorted list of articles that come from the article cache.")
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(defvar gnus-newsgroup-saved nil
  "List of articles that have been saved.")

(defvar gnus-newsgroup-kill-headers nil)

(defvar gnus-newsgroup-replied nil
  "List of articles that have been replied to in the current newsgroup.")

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(defvar gnus-newsgroup-forwarded nil
  "List of articles that have been forwarded in the current newsgroup.")

(defvar gnus-newsgroup-recent nil
  "List of articles that have are recent in the current newsgroup.")

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(defvar gnus-newsgroup-expirable nil
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  "Sorted list of articles in the current newsgroup that can be expired.")
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(defvar gnus-newsgroup-processable nil
  "List of articles in the current newsgroup that can be processed.")

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(defvar gnus-newsgroup-downloadable nil
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  "Sorted list of articles in the current newsgroup that can be processed.")

(defvar gnus-newsgroup-unfetched nil
  "Sorted list of articles in the current newsgroup whose headers have
not been fetched into the agent.

This list will always be a subset of gnus-newsgroup-undownloaded.")
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(defvar gnus-newsgroup-undownloaded nil
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  "List of articles in the current newsgroup that haven't been downloaded.")
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(defvar gnus-newsgroup-unsendable nil
  "List of articles in the current newsgroup that won't be sent.")

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(defvar gnus-newsgroup-bookmarks nil
  "List of articles in the current newsgroup that have bookmarks.")

(defvar gnus-newsgroup-dormant nil