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[gnus] / lisp / gnus.el

;;; gnus.el --- a newsreader for GNU Emacs
;; Copyright (C) 1987,88,89,90,93,94,95,96 Free Software Foundation, Inc.

;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
;;      Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
;; 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
;; the Free Software Foundation; either version 2, or (at your option)
;; 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
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; 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 Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

;;; Commentary:

;;; Code:

(eval '(run-hooks 'gnus-load-hook))

(require 'mail-utils)
(require 'timezone)
(require 'nnheader)

(eval-when-compile (require 'cl))

;; Site dependent variables.  These variables should be defined in
;; paths.el.

(defvar gnus-default-nntp-server nil
  "Specify a default NNTP server.
This variable should be defined in paths.el, and should never be set
by the user.
If you want to change servers, you should use `gnus-select-method'.
See the documentation to that variable.")

(defvar gnus-backup-default-subscribed-newsgroups
  '("news.announce.newusers" "news.groups.questions" "gnu.emacs.gnus")
  "Default default new newsgroups the first time Gnus is run.
Should be set in paths.el, and shouldn't be touched by the user.")

(defvar gnus-local-domain nil
  "Local domain name without a host name.
The DOMAINNAME environment variable is used instead if it is defined.
If the `system-name' function returns the full Internet name, there is
no need to set this variable.")

(defvar gnus-local-organization nil
  "String with a description of what organization (if any) the user belongs to.
The ORGANIZATION environment variable is used instead if it is defined.
If this variable contains a function, this function will be called
with the current newsgroup name as the argument.  The function should
return a string.

In any case, if the string (either in the variable, in the environment
variable, or returned by the function) is a file name, the contents of
this file will be used as the organization.")

(defvar gnus-use-generic-from nil
  "If nil, the full host name will be the system name prepended to the domain name.
If this is a string, the full host name will be this string.
If this is non-nil, non-string, the domain name will be used as the
full host name.")

(defvar gnus-use-generic-path nil
  "If nil, use the NNTP server name in the Path header.
If stringp, use this; if non-nil, use no host name (user name only).")


;; Customization variables

;; Don't touch this variable.
(defvar gnus-nntp-service "nntp"
  "*NNTP service name (\"nntp\" or 119).
This is an obsolete variable, which is scarcely used.  If you use an
nntp server for your newsgroup and want to change the port number
used to 899, you would say something along these lines:

 (setq gnus-select-method '(nntp \"my.nntp.server\" (nntp-port-number 899)))")

(defvar gnus-nntpserver-file "/etc/nntpserver"
  "*A file with only the name of the nntp server in it.")

;; This function is used to check both the environment variable
;; NNTPSERVER and the /etc/nntpserver file to see whether one can find
;; an nntp server name default.
(defun gnus-getenv-nntpserver ()
  (or (getenv "NNTPSERVER")
      (and (file-readable-p gnus-nntpserver-file)
           (save-excursion
             (set-buffer (get-buffer-create " *gnus nntp*"))
             (buffer-disable-undo (current-buffer))
             (insert-file-contents gnus-nntpserver-file)
             (let ((name (buffer-string)))
               (prog1
                   (if (string-match "^[ \t\n]*$" name)
                       nil
                     name)
                 (kill-buffer (current-buffer))))))))

(defvar gnus-select-method
  (nconc
   (list 'nntp (or (condition-case ()
                       (gnus-getenv-nntpserver)
                     (error nil))
                   (if (and gnus-default-nntp-server
                            (not (string= gnus-default-nntp-server "")))
                       gnus-default-nntp-server)
                   (system-name)))
   (if (or (null gnus-nntp-service)
           (equal gnus-nntp-service "nntp"))
       nil
     (list gnus-nntp-service)))
  "*Default method for selecting a newsgroup.
This variable should be a list, where the first element is how the
news is to be fetched, the second is the address.

For instance, if you want to get your news via NNTP from
\"flab.flab.edu\", you could say:

(setq gnus-select-method '(nntp \"flab.flab.edu\"))

If you want to use your local spool, say:

(setq gnus-select-method (list 'nnspool (system-name)))

If you use this variable, you must set `gnus-nntp-server' to nil.

There is a lot more to know about select methods and virtual servers -
see the manual for details.")

(defvar gnus-message-archive-method 
  '(nnfolder "archive" (nnfolder-directory "~/Mail/archive/")
             (nnfolder-active-file "~/Mail/archive/active")
             (nnfolder-get-new-mail nil)
             (nnfolder-inhibit-expiry t))
  "*Method used for archiving messages you've sent.
This should be a mail method.")

(defvar gnus-refer-article-method nil
  "*Preferred method for fetching an article by Message-ID.
If you are reading news from the local spool (with nnspool), fetching
articles by Message-ID is painfully slow.  By setting this method to an
nntp method, you might get acceptable results.

The value of this variable must be a valid select method as discussed
in the documentation of `gnus-select-method'")

(defvar gnus-secondary-select-methods nil
  "*A list of secondary methods that will be used for reading news.
This is a list where each element is a complete select method (see
`gnus-select-method').

If, for instance, you want to read your mail with the nnml backend,
you could set this variable:

(setq gnus-secondary-select-methods '((nnml \"\")))")

(defvar gnus-secondary-servers nil
  "*List of NNTP servers that the user can choose between interactively.
To make Gnus query you for a server, you have to give `gnus' a
non-numeric prefix - `C-u M-x gnus', in short.")

(defvar gnus-nntp-server nil
  "*The name of the host running the NNTP server.
This variable is semi-obsolete.  Use the `gnus-select-method'
variable instead.")

(defvar gnus-startup-file "~/.newsrc"
  "*Your `.newsrc' file.
`.newsrc-SERVER' will be used instead if that exists.")

(defvar gnus-init-file "~/.gnus"
  "*Your Gnus elisp startup file.
If a file with the .el or .elc suffixes exist, it will be read
instead.")

(defvar gnus-group-faq-directory
  '("/ftp@mirrors.aol.com:/pub/rtfm/usenet/"
;    "/ftp@ftp.uu.net:/usenet/news.answers/"
    "/ftp@src.doc.ic.ac.uk:/usenet/news-FAQS/"
    "/ftp@ftp.seas.gwu.edu:/pub/rtfm/"
    "/ftp@rtfm.mit.edu:/pub/usenet/news.answers/"
    "/ftp@ftp.uni-paderborn.de:/pub/FAQ/"
;    "/ftp@ftp.Germany.EU.net:/pub/newsarchive/news.answers/"
    "/ftp@ftp.sunet.se:/pub/usenet/"
    "/ftp@nctuccca.edu.tw:/USENET/FAQ/"
    "/ftp@hwarang.postech.ac.kr:/pub/usenet/news.answers/"
    "/ftp@ftp.hk.super.net:/mirror/faqs/")
  "*Directory where the group FAQs are stored.
This will most commonly be on a remote machine, and the file will be
fetched by ange-ftp.

This variable can also be a list of directories.  In that case, the
first element in the list will be used by default, and the others will
be used as backup sites.

Note that Gnus uses an aol machine as the default directory.  If this
feels fundamentally unclean, just think of it as a way to finally get
something of value back from them.

If the default site is too slow, try one of these:

   North America: mirrors.aol.com                /pub/rtfm/usenet
                  ftp.seas.gwu.edu               /pub/rtfm
                  rtfm.mit.edu                   /pub/usenet/news.answers
   Europe:        ftp.uni-paderborn.de           /pub/FAQ
                  src.doc.ic.ac.uk               /usenet/news-FAQS
                  ftp.sunet.se                   /pub/usenet
   Asia:          nctuccca.edu.tw                /USENET/FAQ
                  hwarang.postech.ac.kr          /pub/usenet/news.answers
                  ftp.hk.super.net               /mirror/faqs")

(defvar gnus-group-archive-directory
  "/ftp@ftp.hpc.uh.edu:/pub/emacs/ding-list/"
  "*The address of the (ding) archives.")

(defvar gnus-group-recent-archive-directory
  "/ftp@ftp.hpc.uh.edu:/pub/emacs/ding-list-recent/"
  "*The address of the most recent (ding) articles.")

(defvar gnus-default-subscribed-newsgroups nil
  "*This variable lists what newsgroups should be subscribed the first time Gnus is used.
It should be a list of strings.
If it is `t', Gnus will not do anything special the first time it is
started; it'll just use the normal newsgroups subscription methods.")

(defvar gnus-use-cross-reference t
  "*Non-nil means that cross referenced articles will be marked as read.
If nil, ignore cross references.  If t, mark articles as read in
subscribed newsgroups.  If neither t nor nil, mark as read in all
newsgroups.")

(defvar 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.")

(defvar gnus-use-dribble-file t
  "*Non-nil means that Gnus will use a dribble file to store user updates.
If Emacs should crash without saving the .newsrc files, complete
information can be restored from the dribble file.")

(defvar gnus-dribble-directory nil
  "*The directory where dribble files will be saved.
If this variable is nil, the directory where the .newsrc files are
saved will be used.")

(defvar gnus-asynchronous nil
  "*If non-nil, Gnus will supply backends with data needed for async article fetching.")

(defvar 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.")

(defvar gnus-large-newsgroup 200
  "*The number of articles which indicates a large newsgroup.
If the number of articles in a newsgroup is greater than this value,
confirmation is required for selecting the newsgroup.")

;; Suggested by Andrew Eskilsson <pi92ae@lelle.pt.hk-r.se>.
(defvar gnus-no-groups-message "No news is horrible news"
  "*Message displayed by Gnus when no groups are available.")

(defvar gnus-use-long-file-name (not (memq system-type '(usg-unix-v xenix)))
  "*Non-nil means that the default name of a file to save articles in is the group name.
If it's nil, the directory form of the group name is used instead.

If this variable is a list, and the list contains the element
`not-score', long file names will not be used for score files; if it
contains the element `not-save', long file names will not be used for
saving; and if it contains the element `not-kill', long file names
will not be used for kill files.")

(defvar gnus-article-save-directory (or (getenv "SAVEDIR") "~/News/")
  "*Name of the directory articles will be saved in (default \"~/News\").
Initialized from the SAVEDIR environment variable.")

(defvar gnus-kill-files-directory (or (getenv "SAVEDIR") "~/News/")
  "*Name of the directory where kill files will be stored (default \"~/News\").
Initialized from the SAVEDIR environment variable.")

(defvar gnus-default-article-saver 'gnus-summary-save-in-rmail
  "*A function to save articles in your favorite format.
The function must be interactively callable (in other words, it must
be an Emacs command).

Gnus provides the following functions:

* gnus-summary-save-in-rmail (Rmail format)
* gnus-summary-save-in-mail (Unix mail format)
* gnus-summary-save-in-folder (MH folder)
* gnus-summary-save-in-file (article format).
* gnus-summary-save-in-vm (use VM's folder format).")

(defvar gnus-prompt-before-saving 'always
  "*This variable says how much prompting is to be done when saving articles.
If it is nil, no prompting will be done, and the articles will be
saved to the default files.  If this variable is `always', each and
every article that is saved will be preceded by a prompt, even when
saving large batches of articles.  If this variable is neither nil not
`always', there the user will be prompted once for a file name for
each invocation of the saving commands.")

(defvar gnus-rmail-save-name (function gnus-plain-save-name)
  "*A function generating a file name to save articles in Rmail format.
The function is called with NEWSGROUP, HEADERS, and optional LAST-FILE.")

(defvar gnus-mail-save-name (function gnus-plain-save-name)
  "*A function generating a file name to save articles in Unix mail format.
The function is called with NEWSGROUP, HEADERS, and optional LAST-FILE.")

(defvar gnus-folder-save-name (function gnus-folder-save-name)
  "*A function generating a file name to save articles in MH folder.
The function is called with NEWSGROUP, HEADERS, and optional LAST-FOLDER.")

(defvar gnus-file-save-name (function gnus-numeric-save-name)
  "*A function generating a file name to save articles in article format.
The function is called with NEWSGROUP, HEADERS, and optional
LAST-FILE.")

(defvar gnus-split-methods
  '((gnus-article-archive-name))
  "*Variable used to suggest where articles are to be saved.
For instance, if you would like to save articles related to Gnus in
the file \"gnus-stuff\", and articles related to VM in \"vm-stuff\",
you could set this variable to something like:

 '((\"^Subject:.*gnus\\|^Newsgroups:.*gnus\" \"gnus-stuff\")
   (\"^Subject:.*vm\\|^Xref:.*vm\" \"vm-stuff\"))

This variable is an alist where the where the key is the match and the
value is a list of possible files to save in if the match is non-nil.

If the match is a string, it is used as a regexp match on the
article.  If the match is a symbol, that symbol will be funcalled
from the buffer of the article to be saved with the newsgroup as the
parameter.  If it is a list, it will be evaled in the same buffer.

If this form or function returns a string, this string will be used as
a possible file name; and if it returns a non-nil list, that list will
be used as possible file names.")

(defvar gnus-move-split-methods nil
  "*Variable used to suggest where articles are to be moved to.
It uses the same syntax as the `gnus-split-methods' variable.")

(defvar gnus-save-score nil
  "*If non-nil, save group scoring info.")

(defvar gnus-use-adaptive-scoring nil
  "*If non-nil, use some adaptive scoring scheme.")

(defvar gnus-use-cache nil
  "*If nil, Gnus will ignore the article cache.
If `passive', it will allow entering (and reading) articles
explicitly entered into the cache.  If anything else, use the
cache to the full extent of the law.")

(defvar gnus-use-trees nil
  "*If non-nil, display a thread tree buffer.")

(defvar gnus-keep-backlog nil
  "*If non-nil, Gnus will keep read articles for later re-retrieval.
If it is a number N, then Gnus will only keep the last N articles
read.  If it is neither nil nor a number, Gnus will keep all read
articles.  This is not a good idea.")

(defvar gnus-use-nocem nil
  "*If non-nil, Gnus will read NoCeM cancel messages.")

(defvar gnus-use-demon nil
  "If non-nil, Gnus might use some demons.")

(defvar gnus-use-scoring t
  "*If non-nil, enable scoring.")

(defvar gnus-use-picons nil
  "*If non-nil, display picons.")

(defvar 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
displayed in the Summary buffer.  If this variable is non-nil, Gnus
will attempt to grab the headers to the old articles, and thereby
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.

The server has to support NOV for any of this to work.")

;see gnus-cus.el
;(defvar gnus-visual t
;  "*If non-nil, will do various highlighting.
;If nil, no mouse highlights (or any other highlights) will be
;performed.  This might speed up Gnus some when generating large group
;and summary buffers.")

(defvar gnus-novice-user t
  "*Non-nil means that you are a usenet novice.
If non-nil, verbose messages may be displayed and confirmations may be
required.")

(defvar gnus-expert-user nil
  "*Non-nil means that you will never be asked for confirmation about anything.
And that means *anything*.")

(defvar gnus-verbose 7
  "*Integer that says how verbose Gnus should be.
The higher the number, the more messages Gnus will flash to say what
it's doing.  At zero, Gnus will be totally mute; at five, Gnus will
display most important messages; and at ten, Gnus will keep on
jabbering all the time.")

(defvar gnus-keep-same-level nil
  "*Non-nil means that the next newsgroup after the current will be on the same level.
When you type, for instance, `n' after reading the last article in the
current newsgroup, you will go to the next newsgroup.  If this variable
is nil, the next newsgroup will be the next from the group
buffer.
If this variable is non-nil, Gnus will either put you in the
next newsgroup with the same level, or, if no such newsgroup is
available, the next newsgroup with the lowest possible level higher
than the current level.
If this variable is `best', Gnus will make the next newsgroup the one
with the best level.")

(defvar 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
subject fields.  (Or rather, they will be printed with a string
given by the `gnus-summary-same-subject' variable.)")

(defvar 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.")

(defvar 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.")

(defvar gnus-simplify-ignored-prefixes nil
  "*Regexp, matches for which are removed from subject lines when simplifying.")

(defvar 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.")

(defvar gnus-summary-thread-gathering-function 'gnus-gather-threads-by-subject
  "Function used for gathering loose threads.
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.")

;; Added by Per Abrahamsen <amanda@iesd.auc.dk>.
(defvar 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'.")

(defvar gnus-summary-goto-unread t
  "*If non-nil, marking commands will go to the next unread article.
If `never', \\<gnus-summary-mode-map>\\[gnus-summary-next-page] will go to the next article,
whether it is read or not.")

(defvar gnus-group-goto-unread t
  "*If non-nil, movement commands will go to the next unread and subscribed group.")

(defvar gnus-goto-next-group-when-activating t
  "*If non-nil, the \\<gnus-group-mode-map>\\[gnus-group-get-new-news-this-group] command will advance point to the next group.")

(defvar gnus-check-new-newsgroups t
  "*Non-nil means that Gnus will add new newsgroups at startup.
If this variable is `ask-server', Gnus will ask the server for new
groups since the last time it checked.  This means that the killed list
is no longer necessary, so you could set `gnus-save-killed-list' to
nil.

A variant is to have this variable be a list of select methods.  Gnus
will then use the `ask-server' method on all these select methods to
query for new groups from all those servers.

Eg.
  (setq gnus-check-new-newsgroups
        '((nntp \"some.server\") (nntp \"other.server\")))

If this variable is nil, then you have to tell Gnus explicitly to
check for new newsgroups with \\<gnus-group-mode-map>\\[gnus-find-new-newsgroups].")

(defvar gnus-check-bogus-newsgroups nil
  "*Non-nil means that Gnus will check and remove bogus newsgroup at startup.
If this variable is nil, then you have to tell Gnus explicitly to
check for bogus newsgroups with \\<gnus-group-mode-map>\\[gnus-group-check-bogus-groups].")

(defvar gnus-read-active-file t
  "*Non-nil means that Gnus will read the entire active file at startup.
If this variable is nil, Gnus will only know about the groups in your
`.newsrc' file.

If this variable is `some', Gnus will try to only read the relevant
parts of the active file from the server.  Not all servers support
this, and it might be quite slow with other servers, but this should
generally be faster than both the t and nil value.

If you set this variable to nil or `some', you probably still want to
be told about new newsgroups that arrive.  To do that, set
`gnus-check-new-newsgroups' to `ask-server'.  This may not work
properly with all servers.")

(defvar gnus-level-subscribed 5
  "*Groups with levels less than or equal to this variable are subscribed.")

(defvar gnus-level-unsubscribed 7
  "*Groups with levels less than or equal to this variable are unsubscribed.
Groups with levels less than `gnus-level-subscribed', which should be
less than this variable, are subscribed.")

(defvar gnus-level-zombie 8
  "*Groups with this level are zombie groups.")

(defvar gnus-level-killed 9
  "*Groups with this level are killed.")

(defvar gnus-level-default-subscribed 3
  "*New subscribed groups will be subscribed at this level.")

(defvar gnus-level-default-unsubscribed 6
  "*New unsubscribed groups will be unsubscribed at this level.")

(defvar gnus-activate-level (1+ gnus-level-subscribed)
  "*Groups higher than this level won't be activated on startup.
Setting this variable to something log might save lots of time when
you have many groups that you aren't interested in.")

(defvar gnus-activate-foreign-newsgroups 4
  "*If nil, Gnus will not check foreign newsgroups at startup.
If it is non-nil, it should be a number between one and nine.  Foreign
newsgroups that have a level lower or equal to this number will be
activated on startup.  For instance, if you want to active all
subscribed newsgroups, but not the rest, you'd set this variable to
`gnus-level-subscribed'.

If you subscribe to lots of newsgroups from different servers, startup
might take a while.  By setting this variable to nil, you'll save time,
but you won't be told how many unread articles there are in the
groups.")

(defvar gnus-save-newsrc-file t
  "*Non-nil means that Gnus will save the `.newsrc' file.
Gnus always saves its own startup file, which is called
\".newsrc.eld\".  The file called \".newsrc\" is in a format that can
be readily understood by other newsreaders.  If you don't plan on
using other newsreaders, set this variable to nil to save some time on
exit.")

(defvar gnus-save-killed-list t
  "*If non-nil, save the list of killed groups to the startup file.
If you set this variable to nil, you'll save both time (when starting
and quitting) and space (both memory and disk), but it will also mean
that Gnus has no record of which groups are new and which are old, so
the automatic new newsgroups subscription methods become meaningless.

You should always set `gnus-check-new-newsgroups' to `ask-server' or
nil if you set this variable to nil.")

(defvar gnus-interactive-catchup t
  "*If non-nil, require your confirmation when catching up a group.")

(defvar gnus-interactive-post t
  "*If non-nil, group name will be asked for when posting.")

(defvar gnus-interactive-exit t
  "*If non-nil, require your confirmation when exiting Gnus.")

(defvar gnus-kill-killed t
  "*If non-nil, Gnus will apply kill files to already killed articles.
If it is nil, Gnus will never apply kill files to articles that have
already been through the scoring process, which might very well save lots
of time.")

(defvar gnus-extract-address-components 'gnus-extract-address-components
  "*Function for extracting address components from a From header.
Two pre-defined function exist: `gnus-extract-address-components',
which is the default, quite fast, and too simplistic solution, and
`mail-extract-address-components', which works much better, but is
slower.")

(defvar gnus-summary-default-score 0
  "*Default article score level.
If this variable is nil, scoring will be disabled.")

(defvar 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.")

(defvar 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.")

(defvar gnus-permanently-visible-groups nil
  "*Regexp to match groups that should always be listed in the group buffer.
This means that they will still be listed when there are no unread
articles in the groups.")

(defvar gnus-list-groups-with-ticked-articles t
  "*If non-nil, list groups that have only ticked articles.
If nil, only list groups that have unread articles.")

(defvar gnus-group-default-list-level gnus-level-subscribed
  "*Default listing level.
Ignored if `gnus-group-use-permanent-levels' is non-nil.")

(defvar gnus-group-use-permanent-levels nil
  "*If non-nil, once you set a level, Gnus will use this level.")

(defvar gnus-group-list-inactive-groups t
  "*If non-nil, inactive groups will be listed.")

(defvar gnus-show-mime nil
  "*If non-nil, do mime processing of articles.
The articles will simply be fed to the function given by
`gnus-show-mime-method'.")

(defvar gnus-strict-mime t
  "*If nil, MIME-decode even if there is no Mime-Version header in the article.")

(defvar gnus-show-mime-method 'metamail-buffer
  "*Function to process a MIME message.
The function is called from the article buffer.")

(defvar gnus-decode-encoded-word-method (lambda ())
  "*Function to decode a MIME encoded-words.
The function is called from the article buffer.")

(defvar gnus-show-threads t
  "*If non-nil, display threads in summary mode.")

(defvar gnus-thread-hide-subtree nil
  "*If non-nil, hide all threads initially.
If threads are hidden, you have to run the command
`gnus-summary-show-thread' by hand or use `gnus-select-article-hook'
to expose hidden threads.")

(defvar gnus-thread-hide-killed t
  "*If non-nil, hide killed threads automatically.")

(defvar gnus-thread-ignore-subject nil
  "*If non-nil, ignore subjects and do all threading based on the Reference header.
If nil, which is the default, articles that have different subjects
from their parents will start separate threads.")

(defvar 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.")

(defvar gnus-thread-indent-level 4
  "*Number that says how much each sub-thread should be indented.")

(defvar gnus-ignored-newsgroups
  (purecopy (mapconcat 'identity
                       '("^to\\."       ; not "real" groups
                         "^[0-9. \t]+ " ; all digits in name
                         "[][\"#'()]"   ; bogus characters
                         )
                       "\\|"))
  "*A regexp to match uninteresting newsgroups in the active file.
Any lines in the active file matching this regular expression are
removed from the newsgroup list before anything else is done to it,
thus making them effectively non-existent.")

(defvar gnus-ignored-headers
  "^Path:\\|^Posting-Version:\\|^Article-I.D.:\\|^Expires:\\|^Date-Received:\\|^References:\\|^Control:\\|^Xref:\\|^Lines:\\|^Posted:\\|^Relay-Version:\\|^Message-ID:\\|^Nf-ID:\\|^Nf-From:\\|^Approved:\\|^Sender:\\|^Received:\\|^Mail-from:"
  "*All headers that match this regexp will be hidden.
This variable can also be a list of regexps of headers to be ignored.
If `gnus-visible-headers' is non-nil, this variable will be ignored.")

(defvar gnus-visible-headers "^From:\\|^Newsgroups:\\|^Subject:\\|^Date:\\|^Followup-To:\\|^Reply-To:\\|^Organization:\\|^Summary:\\|^Keywords:\\|^To:\\|^Cc:\\|^Posted-To:\\|^Mail-Copies-To:\\|^Apparently-To:\\|^Gnus-Warning:\\|^Resent-"
  "*All headers that do not match this regexp will be hidden.
This variable can also be a list of regexp of headers to remain visible.
If this variable is non-nil, `gnus-ignored-headers' will be ignored.")

(defvar gnus-sorted-header-list
  '("^From:" "^Subject:" "^Summary:" "^Keywords:" "^Newsgroups:" "^To:"
    "^Cc:" "^Date:" "^Organization:")
  "*This variable is a list of regular expressions.
If it is non-nil, headers that match the regular expressions will
be placed first in the article buffer in the sequence specified by
this list.")

(defvar gnus-boring-article-headers
  '(empty followup-to reply-to)
  "*Headers that are only to be displayed if they have interesting data.
Possible values in this list are `empty', `newsgroups', `followup-to',
`reply-to', and `date'.")

(defvar gnus-show-all-headers nil
  "*If non-nil, don't hide any headers.")

(defvar gnus-save-all-headers t
  "*If non-nil, don't remove any headers before saving.")

(defvar gnus-saved-headers gnus-visible-headers
  "*Headers to keep if `gnus-save-all-headers' is nil.
If `gnus-save-all-headers' is non-nil, this variable will be ignored.
If that variable is nil, however, all headers that match this regexp
will be kept while the rest will be deleted before saving.")

(defvar gnus-inhibit-startup-message nil
  "*If non-nil, the startup message will not be displayed.")

(defvar gnus-signature-separator "^-- *$"
  "Regexp matching signature separator.")

(defvar gnus-auto-extend-newsgroup t
  "*If non-nil, extend newsgroup forward and backward when requested.")

(defvar gnus-auto-select-first t
  "*If nil, don't select the first unread article when entering a group.
If this variable is `best', select the highest-scored unread article
in the group.  If neither nil nor `best', select the first unread
article.

If you want to prevent automatic selection of the first unread article
in some newsgroups, set the variable to nil in
`gnus-select-group-hook'.")

(defvar 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
summary mode and go back to group mode.  If the value is neither nil
nor t, Gnus will select the following unread newsgroup.  In
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.
Finally, if this variable is `slightly-quietly', the `Z n' command
will go to the next group without confirmation.")

(defvar gnus-auto-select-same nil
  "*If non-nil, select the next article with the same subject.")

(defvar 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.")

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

(defvar gnus-break-pages t
  "*If non-nil, do page breaking on articles.
The page delimiter is specified by the `gnus-page-delimiter'
variable.")

(defvar gnus-page-delimiter "^\^L"
  "*Regexp describing what to use as article page delimiters.
The default value is \"^\^L\", which is a form linefeed at the
beginning of a line.")

(defvar gnus-use-full-window t
  "*If non-nil, use the entire Emacs screen.")

(defvar gnus-window-configuration nil
  "Obsolete variable.  See `gnus-buffer-configuration'.")

(defvar gnus-window-min-width 2
  "*Minimum width of Gnus buffers.")

(defvar gnus-window-min-height 1
  "*Minimum height of Gnus buffers.")

(defvar gnus-buffer-configuration
  '((group
     (vertical 1.0
               (group 1.0 point)
               (if gnus-carpal '(group-carpal 4))))
    (summary
     (vertical 1.0
               (summary 1.0 point)
               (if gnus-carpal '(summary-carpal 4))))
    (article
     (cond 
      (gnus-use-picons
       '(frame 1.0
               (vertical 1.0
                         (summary 0.25 point)
                         (if gnus-carpal '(summary-carpal 4))
                         (article 1.0))
               (vertical ((height . 5) (width . 15)
                          (user-position . t)
                          (left . -1) (top . 1))
                         (picons 1.0))))
      (gnus-use-trees
       '(vertical 1.0
                  (summary 0.25 point)
                  (tree 0.25)
                  (article 1.0)))
      (t
       '(vertical 1.0
                 (summary 0.25 point)
                 (if gnus-carpal '(summary-carpal 4))
                 (if gnus-use-trees '(tree 0.25))
                 (article 1.0)))))
    (server
     (vertical 1.0
               (server 1.0 point)
               (if gnus-carpal '(server-carpal 2))))
    (browse
     (vertical 1.0
               (browse 1.0 point)
               (if gnus-carpal '(browse-carpal 2))))
    (group-mail
     (vertical 1.0
               (mail 1.0 point)))
    (summary-mail
     (vertical 1.0
               (mail 1.0 point)))
    (summary-reply
     (vertical 1.0
               (article 0.5)
               (mail 1.0 point)))
    (pick
     (vertical 1.0
               (article 1.0 point)))
    (info
     (vertical 1.0
               (info 1.0 point)))
    (summary-faq
     (vertical 1.0
               (summary 0.25)
               (faq 1.0 point)))
    (edit-group
     (vertical 1.0
               (group 0.5)
               (edit-group 1.0 point)))
    (edit-server
     (vertical 1.0
               (server 0.5)
               (edit-server 1.0 point)))
    (edit-score
     (vertical 1.0
               (summary 0.25)
               (edit-score 1.0 point)))
    (post
     (vertical 1.0
               (post 1.0 point)))
    (reply
     (vertical 1.0
               (article 0.5)
               (mail 1.0 point)))
    (mail-forward
     (vertical 1.0
               (mail 1.0 point)))
    (post-forward
     (vertical 1.0
               (post 1.0 point)))
    (reply-yank
     (vertical 1.0
               (mail 1.0 point)))
    (mail-bounce
     (vertical 1.0
               (article 0.5)
               (mail 1.0 point)))
    (draft
     (vertical 1.0
               (draft 1.0 point)))
    (pipe
     (vertical 1.0
               (summary 0.25 point)
               (if gnus-carpal '(summary-carpal 4))
               ("*Shell Command Output*" 1.0)))
    (followup
     (vertical 1.0
               (article 0.5)
               (post 1.0 point)))
    (followup-yank
     (vertical 1.0
               (post 1.0 point))))
  "Window configuration for all possible Gnus buffers.
This variable is a list of lists.  Each of these lists has a NAME and
a RULE.  The NAMEs are commonsense names like `group', which names a
rule used when displaying the group buffer; `summary', which names a
rule for what happens when you enter a group and do not display an
article buffer; and so on.  See the value of this variable for a
complete list of NAMEs.

Each RULE is a list of vectors.  The first element in this vector is
the name of the buffer to be displayed; the second element is the
percentage of the screen this buffer is to occupy (a number in the
0.0-0.99 range); the optional third element is `point', which should
be present to denote which buffer point is to go to after making this
buffer configuration.")

(defvar gnus-window-to-buffer
  '((group . gnus-group-buffer)
    (summary . gnus-summary-buffer)
    (article . gnus-article-buffer)
    (server . gnus-server-buffer)
    (browse . "*Gnus Browse Server*")
    (edit-group . gnus-group-edit-buffer)
    (edit-server . gnus-server-edit-buffer)
    (group-carpal . gnus-carpal-group-buffer)
    (summary-carpal . gnus-carpal-summary-buffer)
    (server-carpal . gnus-carpal-server-buffer)
    (browse-carpal . gnus-carpal-browse-buffer)
    (edit-score . gnus-score-edit-buffer)
    (mail . gnus-mail-buffer)
    (post . gnus-post-news-buffer)
    (faq . gnus-faq-buffer)
    (picons . "*Picons*")
    (tree . gnus-tree-buffer)
    (info . gnus-info-buffer)
    (draft . gnus-draft-buffer))
  "Mapping from short symbols to buffer names or buffer variables.")

(defvar gnus-carpal nil
  "*If non-nil, display clickable icons.")

(defvar gnus-subscribe-newsgroup-method 'gnus-subscribe-zombies
  "*Function called with a group name when new group is detected.
A few pre-made functions are supplied: `gnus-subscribe-randomly'
inserts new groups at the beginning of the list of groups;
`gnus-subscribe-alphabetically' inserts new groups in strict
alphabetic order; `gnus-subscribe-hierarchically' inserts new groups
in hierarchical newsgroup order; `gnus-subscribe-interactively' asks
for your decision; `gnus-subscribe-killed' kills all new groups.")

;; Suggested by a bug report by Hallvard B Furuseth.
;; <h.b.furuseth@usit.uio.no>.
(defvar gnus-subscribe-options-newsgroup-method
  (function gnus-subscribe-alphabetically)
  "*This function is called to subscribe newsgroups mentioned on \"options -n\" lines.
If, for instance, you want to subscribe to all newsgroups in the
\"no\" and \"alt\" hierarchies, you'd put the following in your
.newsrc file:

options -n no.all alt.all

Gnus will the subscribe all new newsgroups in these hierarchies with
the subscription method in this variable.")

(defvar gnus-subscribe-hierarchical-interactive nil
  "*If non-nil, Gnus will offer to subscribe hierarchically.
When a new hierarchy appears, Gnus will ask the user:

'alt.binaries': Do you want to subscribe to this hierarchy? ([d]ys):

If the user pressed `d', Gnus will descend the hierarchy, `y' will
subscribe to all newsgroups in the hierarchy and `s' will skip this
hierarchy in its entirety.")

(defvar gnus-group-sort-function 'gnus-group-sort-by-alphabet
  "*Function used for sorting the group buffer.
This function will be called with group info entries as the arguments
for the groups to be sorted.  Pre-made functions include
`gnus-group-sort-by-alphabet', `gnus-group-sort-by-unread',
`gnus-group-sort-by-level', `gnus-group-sort-by-score', and
`gnus-group-sort-by-rank'.

This variable can also be a list of sorting functions.  In that case,
the most significant sort function should be the last function in the
list.")

;; Mark variables suggested by Thomas Michanek
;; <Thomas.Michanek@telelogic.se>.
(defvar gnus-unread-mark ? 
  "*Mark used for unread articles.")
(defvar gnus-ticked-mark ?!
  "*Mark used for ticked articles.")
(defvar gnus-dormant-mark ??
  "*Mark used for dormant articles.")
(defvar gnus-del-mark ?r
  "*Mark used for del'd articles.")
(defvar gnus-read-mark ?R
  "*Mark used for read articles.")
(defvar gnus-expirable-mark ?E
  "*Mark used for expirable articles.")
(defvar gnus-killed-mark ?K
  "*Mark used for killed articles.")
(defvar gnus-souped-mark ?F
  "*Mark used for killed articles.")
(defvar gnus-kill-file-mark ?X
  "*Mark used for articles killed by kill files.")
(defvar gnus-low-score-mark ?Y
  "*Mark used for articles with a low score.")
(defvar gnus-catchup-mark ?C
  "*Mark used for articles that are caught up.")
(defvar gnus-replied-mark ?A
  "*Mark used for articles that have been replied to.")
(defvar gnus-cached-mark ?*
  "*Mark used for articles that are in the cache.")
(defvar gnus-saved-mark ?S
  "*Mark used for articles that have been saved to.")
(defvar gnus-process-mark ?#
  "*Process mark.")
(defvar gnus-ancient-mark ?O
  "*Mark used for ancient articles.")
(defvar gnus-sparse-mark ?Q
  "*Mark used for sparsely reffed articles.")
(defvar gnus-canceled-mark ?G
  "*Mark used for canceled articles.")
(defvar gnus-score-over-mark ?+
  "*Score mark used for articles with high scores.")
(defvar gnus-score-below-mark ?-
  "*Score mark used for articles with low scores.")
(defvar gnus-empty-thread-mark ? 
  "*There is no thread under the article.")
(defvar gnus-not-empty-thread-mark ?=
  "*There is a thread under the article.")

(defvar gnus-view-pseudo-asynchronously nil
  "*If non-nil, Gnus will view pseudo-articles asynchronously.")

(defvar 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.")

(defvar 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.")

(defvar gnus-insert-pseudo-articles t
  "*If non-nil, insert pseudo-articles when decoding articles.")

(defvar gnus-group-line-format "%M%S%p%P%5y: %(%g%)\n"
  "*Format of group lines.
It works along the same lines as a normal formatting string,
with some simple extensions.

%M    Only marked articles (character, \"*\" or \" \")
%S    Whether the group is subscribed (character, \"U\", \"K\", \"Z\" or \" \")
%L    Level of subscribedness (integer)
%N    Number of unread articles (integer)
%I    Number of dormant articles (integer)
%i    Number of ticked and dormant (integer)
%T    Number of ticked articles (integer)
%R    Number of read articles (integer)
%t    Total number of articles (integer)
%y    Number of unread, unticked articles (integer)
%G    Group name (string)
%g    Qualified group name (string)
%D    Group description (string)
%s    Select method (string)
%o    Moderated group (char, \"m\")
%p    Process mark (char)
%O    Moderated group (string, \"(m)\" or \"\")
%P    Topic indentation (string)
%n    Select from where (string)
%z    A string that look like `<%s:%n>' if a foreign select method is used
%u    User defined specifier.  The next character in the format string should
      be a letter.  Gnus will call the function gnus-user-format-function-X,
      where X is the letter following %u.  The function will be passed the
      current header as argument.  The function should return a string, which
      will be inserted into the buffer just like information from any other
      group specifier.

Text between %( and %) will be highlighted with `gnus-mouse-face' when
the mouse point move inside the area.  There can only be one such area.

Note that this format specification is not always respected.  For
reasons of efficiency, when listing killed groups, this specification
is ignored altogether.  If the spec is changed considerably, your
output may end up looking strange when listing both alive and killed
groups.

If you use %o or %O, reading the active file will be slower and quite
a bit of extra memory will be used. %D will also worsen performance.
Also note that if you change the format specification to include any
of these specs, you must probably re-start Gnus to see them go into
effect.")

(defvar gnus-summary-line-format "%U%R%z%I%(%[%4L: %-20,20n%]%) %s\n"
  "*The format specification of the lines in the summary buffer.

It works along the same lines as a normal formatting string,
with some simple extensions.

%N   Article number, left padded with spaces (string)
%S   Subject (string)
%s   Subject if it is at the root of a thread, and \"\" otherwise (string)
%n   Name of the poster (string)
%a   Extracted name of the poster (string)
%A   Extracted address of the poster (string)
%F   Contents of the From: header (string)
%x   Contents of the Xref: header (string)
%D   Date of the article (string)
%d   Date of the article (string) in DD-MMM format
%M   Message-id of the article (string)
%r   References of the article (string)
%c   Number of characters in the article (integer)
%L   Number of lines in the article (integer)
%I   Indentation based on thread level (a string of spaces)
%T   A string with two possible values: 80 spaces if the article
     is on thread level two or larger and 0 spaces on level one
%R   \"A\" if this article has been replied to, \" \" otherwise (character)
%U   Status of this article (character, \"R\", \"K\", \"-\" or \" \")
%[   Opening bracket (character, \"[\" or \"<\")
%]   Closing bracket (character, \"]\" or \">\")
%>   Spaces of length thread-level (string)
%<   Spaces of length (- 20 thread-level) (string)
%i   Article score (number)
%z   Article zcore (character)
%t   Number of articles under the current thread (number).
%e   Whether the thread is empty or not (character).
%u   User defined specifier.  The next character in the format string should
     be a letter.  Gnus will call the function gnus-user-format-function-X,
     where X is the letter following %u.  The function will be passed the
     current header as argument.  The function should return a string, which
     will be inserted into the summary just like information from any other
     summary specifier.

Text between %( and %) will be highlighted with `gnus-mouse-face'
when the mouse point is placed inside the area.  There can only be one
such area.

The %U (status), %R (replied) and %z (zcore) specs have to be handled
with care.  For reasons of efficiency, Gnus will compute what column
these characters will end up in, and \"hard-code\" that.  This means that
it is illegal to have these specs after a variable-length spec.  Well,
you might not be arrested, but your summary buffer will look strange,
which is bad enough.

The smart choice is to have these specs as for to the left as
possible.

This restriction may disappear in later versions of Gnus.")

(defvar gnus-summary-dummy-line-format
  "*  %(:                          :%) %S\n"
  "*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.

%S  The subject")

(defvar gnus-summary-mode-line-format "Gnus: %%b [%A] %Z"
  "*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
%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")

(defvar gnus-article-mode-line-format "Gnus: %%b %S"
  "*The format specification for the article mode line.
See `gnus-summary-mode-line-format' for a closer description.")

(defvar gnus-group-mode-line-format "Gnus: %%b {%M:%S}"
  "*The format specification for the group mode line.
It works along the same lines as a normal formatting string,
with some simple extensions:

%S   The native news server.
%M   The native select method.")

(defvar gnus-valid-select-methods
  '(("nntp" post address prompt-address)
    ("nnspool" post)
    ("nnvirtual" post-mail virtual prompt-address)
    ("nnmbox" mail respool)
    ("nnml" mail respool)
    ("nnmh" mail respool)
    ("nndir" post-mail prompt-address address)
    ("nneething" none prompt-address)
    ("nndoc" none prompt-address)
    ("nnbabyl" mail respool)
    ("nnkiboze" post virtual)
    ("nnsoup" post-mail)
    ("nnfolder" mail respool))
  "An alist of valid select methods.
The first element of each list lists should be a string with the name
of the select method.  The other elements may be be the category of
this method (ie. `post', `mail', `none' or whatever) or other
properties that this method has (like being respoolable).
If you implement a new select method, all you should have to change is
this variable.  I think.")

(defvar gnus-updated-mode-lines '(group article summary tree)
  "*List of buffers that should update their mode lines.
The list may contain the symbols `group', `article' and `summary'.  If
the corresponding symbol is present, Gnus will keep that mode line
updated with information that may be pertinent.
If this variable is nil, screen refresh may be quicker.")

;; Added by Keinonen Kari <kk85613@cs.tut.fi>.
(defvar gnus-mode-non-string-length nil
  "*Max length of mode-line non-string contents.
If this is nil, Gnus will take space as is needed, leaving the rest
of the modeline intact.")

;see gnus-cus.el
;(defvar gnus-mouse-face 'highlight
;  "*Face used for mouse highlighting in Gnus.
;No mouse highlights will be done if `gnus-visual' is nil.")

(defvar gnus-summary-mark-below nil
  "*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.")

(defvar gnus-article-sort-functions '(gnus-article-sort-by-number)
  "*List of functions used for sorting articles in the summary buffer.
This variable is only used when not using a threaded display.")

(defvar 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.

Each function takes two threads and return 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.

Ready-mady functions include `gnus-thread-sort-by-number',
`gnus-thread-sort-by-author', `gnus-thread-sort-by-subject',
`gnus-thread-sort-by-date', `gnus-thread-sort-by-score' and
`gnus-thread-sort-by-total-score' (see `gnus-thread-score-function').")

(defvar 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'.")

(defvar gnus-summary-expunge-below nil
  "All articles that have a score less than this variable will be expunged.")

(defvar 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
\"thread score\" is.")

(defvar gnus-auto-subscribed-groups
  "^nnml\\|^nnfolder\\|^nnmbox\\|^nnmh\\|^nnbabyl"
  "*All new groups that match this regexp will be subscribed automatically.
Note that this variable only deals with new groups.  It has no effect
whatsoever on old groups.")

(defvar gnus-options-subscribe nil
  "*All new groups matching this regexp will be subscribed unconditionally.
Note that this variable deals only with new newsgroups.  This variable
does not affect old newsgroups.")

(defvar gnus-options-not-subscribe nil
  "*All new groups matching this regexp will be ignored.
Note that this variable deals only with new newsgroups.  This variable
does not affect old (already subscribed) newsgroups.")

(defvar gnus-auto-expirable-newsgroups nil
  "*Groups in which to automatically mark read articles as expirable.
If non-nil, this should be a regexp that should match all groups in
which to perform auto-expiry.  This only makes sense for mail groups.")

(defvar gnus-total-expirable-newsgroups nil
  "*Groups in which to perform expiry of all read articles.
Use with extreme caution.  All groups that match this regexp will be
expiring - which means that all read articles will be deleted after
(say) one week.  (This only goes for mail groups and the like, of
course.)")

(defvar gnus-group-uncollapsed-levels 1
  "Number of group name elements to leave alone when making a short group name.")

(defvar gnus-hidden-properties '(invisible t intangible t)
  "Property list to use for hiding text.")

(defvar gnus-modtime-botch nil
  "*Non-nil means .newsrc should be deleted prior to save.  Its use is
due to the bogus appearance that .newsrc was modified on disc.")

;; Hooks.

(defvar gnus-group-mode-hook nil
  "*A hook for Gnus group mode.")

(defvar gnus-summary-mode-hook nil
  "*A hook for Gnus summary mode.
This hook is run before any variables are set in the summary buffer.")

(defvar gnus-article-mode-hook nil
  "*A hook for Gnus article mode.")

(defvar gnus-summary-prepare-exit-hook nil
  "*A hook called when preparing to exit from the summary buffer.
It calls `gnus-summary-expire-articles' by default.")
(add-hook 'gnus-summary-prepare-exit-hook 'gnus-summary-expire-articles)

(defvar gnus-summary-exit-hook nil
  "*A hook called on exit from the summary buffer.")

(defvar gnus-group-catchup-group-hook nil
  "*A hook run when catching up a group from the group buffer.")

(defvar gnus-open-server-hook nil
  "*A hook called just before opening connection to the news server.")

(defvar gnus-load-hook nil
  "*A hook run while Gnus is loaded.")

(defvar gnus-startup-hook nil
  "*A hook called at startup.
This hook is called after Gnus is connected to the NNTP server.")

(defvar gnus-get-new-news-hook nil
  "*A hook run just before Gnus checks for new news.")

(defvar gnus-group-prepare-function 'gnus-group-prepare-flat
  "*A function that is called to generate the group buffer.
The function is called with three arguments: The first is a number;
all group with a level less or equal to that number should be listed,
if the second is non-nil, empty groups should also be displayed.  If
the third is non-nil, it is a number.  No groups with a level lower
than this number should be displayed.

The only current function implemented is `gnus-group-prepare-flat'.")

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

(defvar 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.")

(defvar 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.")

(defvar gnus-article-prepare-hook nil
  "*A hook called after an article has been prepared in the article buffer.
If you want to run a special decoding program like nkf, use this hook.")

;(defvar gnus-article-display-hook nil
;  "*A hook called after the article is displayed in the article buffer.
;The hook is designed to change the contents of the article
;buffer.  Typical functions that this hook may contain are
;`gnus-article-hide-headers' (hide selected headers),
;`gnus-article-maybe-highlight' (perform fancy article highlighting),
;`gnus-article-hide-signature' (hide signature) and
;`gnus-article-treat-overstrike' (turn \"^H_\" into bold characters).")
;(add-hook 'gnus-article-display-hook 'gnus-article-hide-headers-if-wanted)
;(add-hook 'gnus-article-display-hook 'gnus-article-treat-overstrike)
;(add-hook 'gnus-article-display-hook 'gnus-article-maybe-highlight)

(defvar gnus-article-x-face-command
  "{ echo '/* Width=48, Height=48 */'; uncompface; } | icontopbm | xv -quit -"
  "String or function to be executed to display an X-Face header.
If it is a string, the command will be executed in a sub-shell
asynchronously.  The compressed face will be piped to this command.")

(defvar gnus-article-x-face-too-ugly nil
  "Regexp matching posters whose face shouldn't be shown automatically.")

(defvar 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:

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

(defvar gnus-select-article-hook nil
  "*A hook called when an article is selected.")

(defvar gnus-apply-kill-hook '(gnus-apply-kill-file)
  "*A hook called to apply kill files to a group.
This hook is intended to apply a kill file to the selected newsgroup.
The function `gnus-apply-kill-file' is called by default.

Since a general kill file is too heavy to use only for a few
newsgroups, I recommend you to use a lighter hook function.  For
example, if you'd like to apply a kill file to articles which contains
a string `rmgroup' in subject in newsgroup `control', you can use the
following hook:

 (setq gnus-apply-kill-hook
      (list
        (lambda ()
          (cond ((string-match \"control\" gnus-newsgroup-name)
                 (gnus-kill \"Subject\" \"rmgroup\")
                 (gnus-expunge \"X\"))))))")

(defvar 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.")

(defvar gnus-parse-headers-hook nil
  "*A hook called before parsing the headers.")

(defvar gnus-exit-group-hook nil
  "*A hook called when exiting (not quitting) summary mode.")

(defvar gnus-suspend-gnus-hook nil
  "*A hook called when suspending (not exiting) Gnus.")

(defvar gnus-exit-gnus-hook nil
  "*A hook called when exiting Gnus.")

(defvar gnus-save-newsrc-hook nil
  "*A hook called before saving any of the newsrc files.")

(defvar gnus-save-quick-newsrc-hook nil
  "*A hook called just before saving the quick newsrc file.
Can be used to turn version control on or off.")

(defvar gnus-save-standard-newsrc-hook nil
  "*A hook called just before saving the standard newsrc file.
Can be used to turn version control on or off.")

(defvar 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.")

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

The default function `gnus-group-highlight-line' will
highlight the line according to the `gnus-group-highlight'
variable.")

(defvar gnus-mark-article-hook (list 'gnus-summary-mark-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.")

(defvar gnus-group-change-level-function nil
  "Function run when a group level is changed.
It is called with three parameters -- GROUP, LEVEL and OLDLEVEL.")

;; Remove any hilit infestation.
(add-hook 'gnus-startup-hook
          (lambda ()
            (remove-hook 'gnus-summary-prepare-hook
                         'hilit-rehighlight-buffer-quietly)
            (remove-hook 'gnus-summary-prepare-hook 'hilit-install-line-hooks)
            (setq gnus-mark-article-hook '(gnus-summary-mark-unread-as-read))
            (remove-hook 'gnus-article-prepare-hook
                         'hilit-rehighlight-buffer-quietly)))


\f
;; Internal variables

(defvar gnus-topic-indentation "") ;; Obsolete variable.

(defvar gnus-goto-missing-group-function nil)

(defvar gnus-override-subscribe-method nil)

(defvar gnus-group-goto-next-group-function nil
  "Function to override finding the next group after listing groups.")

(defconst gnus-article-mark-lists
  '((marked . tick) (replied . reply)
    (expirable . expire) (killed . killed)
    (bookmarks . bookmark) (dormant . dormant)
    (scored . score) (saved . save)
    (cached . cache)))

;; Avoid highlighting in kill files.
(defvar gnus-summary-inhibit-highlight nil)
(defvar gnus-newsgroup-selected-overlay nil)

(defvar gnus-inhibit-hiding nil)
(defvar gnus-group-indentation "")
(defvar gnus-inhibit-limiting nil)

(defvar gnus-article-mode-map nil)
(defvar gnus-dribble-buffer nil)
(defvar gnus-headers-retrieved-by nil)
(defvar gnus-article-reply nil)
(defvar gnus-override-method nil)
(defvar gnus-article-check-size nil)

(defvar gnus-nocem-hashtb nil)

(defvar gnus-current-score-file nil)
(defvar gnus-newsgroup-adaptive-score-file nil)
(defvar gnus-scores-exclude-files nil)

(defvar gnus-opened-servers nil)

(defvar gnus-current-move-group nil)

(defvar gnus-newsgroup-dependencies nil)
(defvar gnus-newsgroup-async nil)
(defconst gnus-group-edit-buffer "*Gnus edit newsgroup*")

(defvar gnus-newsgroup-adaptive nil)

(defvar gnus-summary-display-table nil)
(defvar gnus-summary-display-article-function nil)

(defvar gnus-summary-highlight-line-function nil
  "Function called after highlighting a summary line.")

(defvar gnus-group-line-format-alist
  `((?M gnus-tmp-marked-mark ?c)
    (?S gnus-tmp-subscribed ?c)
    (?L gnus-tmp-level ?d)
    (?N (cond ((eq number t) "*" )
              ((numberp number) 
               (int-to-string
                (+ number
                   (gnus-range-length (cdr (assq 'dormant gnus-tmp-marked)))
                   (gnus-range-length (cdr (assq 'tick gnus-tmp-marked))))))
              (t number)) ?s)
    (?R gnus-tmp-number-of-read ?s)
    (?t gnus-tmp-number-total ?d)
    (?y gnus-tmp-number-of-unread ?s)
    (?I (gnus-range-length (cdr (assq 'dormant gnus-tmp-marked))) ?d)
    (?T (gnus-range-length (cdr (assq 'tick gnus-tmp-marked))) ?d)
    (?i (+ (gnus-range-length (cdr (assq 'dormant gnus-tmp-marked)))
           (gnus-range-length (cdr (assq 'tick gnus-tmp-marked)))) ?d)
    (?g gnus-tmp-group ?s)
    (?G gnus-tmp-qualified-group ?s)
    (?c (gnus-short-group-name gnus-tmp-group) ?s)
    (?D gnus-tmp-newsgroup-description ?s)
    (?o gnus-tmp-moderated ?c)
    (?O gnus-tmp-moderated-string ?s)
    (?p gnus-tmp-process-marked ?c)
    (?s gnus-tmp-news-server ?s)
    (?n gnus-tmp-news-method ?s)
    (?P gnus-group-indentation ?s)
    (?z gnus-tmp-news-method-string ?s)
    (?u gnus-tmp-user-defined ?s)))

(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)
    (?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)
    (?L gnus-tmp-lines ?d)
    (?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)
    (?V (gnus-thread-total-score (and (boundp 'thread) (car thread))) ?d)
    (?U gnus-tmp-unread ?c)
    (?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))
  "An alist of format specifications that can appear in summary lines,
and what variables they correspond with, along with the type of the
variable (string, integer, character, etc).")

(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 ?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)
      (?r (length gnus-newsgroup-reads) ?d)
      (?E gnus-newsgroup-expunged-tally ?d)
      (?s (gnus-current-score-file-nondirectory) ?s))))

(defvar gnus-article-mode-line-format-alist
  gnus-summary-mode-line-format-alist)

(defvar gnus-group-mode-line-format-alist
  (` ((?S gnus-tmp-news-server ?s)
      (?M gnus-tmp-news-method ?s)
      (?u gnus-tmp-user-defined ?s))))

(defvar gnus-have-read-active-file nil)

(defconst gnus-maintainer
  "gnus-bug@ifi.uio.no (The Gnus Bugfixing Girls + Boys)"
  "The mail address of the Gnus maintainers.")

(defconst gnus-version "September Gnus v0.37"
  "Version number for this version of Gnus.")

(defvar gnus-info-nodes
  '((gnus-group-mode            "(gnus)The Group Buffer")
    (gnus-summary-mode          "(gnus)The Summary Buffer")
    (gnus-article-mode          "(gnus)The Article Buffer"))
  "Assoc list of major modes and related Info nodes.")

(defvar gnus-group-buffer "*Group*")
(defvar gnus-summary-buffer "*Summary*")
(defvar gnus-article-buffer "*Article*")
(defvar gnus-server-buffer "*Server*")

(defvar gnus-work-buffer " *gnus work*")

(defvar gnus-original-article-buffer " *Original Article*")
(defvar gnus-original-article nil)

(defvar gnus-buffer-list nil
  "Gnus buffers that should be killed on exit.")

(defvar gnus-server-alist nil
  "List of available servers.")

(defvar gnus-slave nil
  "Whether this Gnus is a slave or not.")

(defvar gnus-variable-list
  '(gnus-newsrc-options gnus-newsrc-options-n
    gnus-newsrc-last-checked-date
    gnus-newsrc-alist gnus-server-alist
    gnus-killed-list gnus-zombie-list
    gnus-topic-topology gnus-topic-alist
    gnus-format-specs)
  "Gnus variables saved in the quick startup file.")

(defvar gnus-newsrc-options nil
  "Options line in the .newsrc file.")

(defvar gnus-newsrc-options-n nil
  "List of regexps representing groups to be subscribed/ignored unconditionally.")

(defvar gnus-newsrc-last-checked-date nil
  "Date Gnus last asked server for new newsgroups.")

(defvar gnus-topic-topology nil
  "The complete topic hierarchy.")

(defvar gnus-topic-alist nil
  "The complete topic-group alist.")

(defvar gnus-newsrc-alist nil
  "Assoc list of read articles.
gnus-newsrc-hashtb should be kept so that both hold the same information.")

(defvar gnus-newsrc-hashtb nil
  "Hashtable of gnus-newsrc-alist.")

(defvar gnus-killed-list nil
  "List of killed newsgroups.")

(defvar gnus-killed-hashtb nil
  "Hash table equivalent of gnus-killed-list.")

(defvar gnus-zombie-list nil
  "List of almost dead newsgroups.")

(defvar gnus-description-hashtb nil
  "Descriptions of newsgroups.")

(defvar gnus-list-of-killed-groups nil
  "List of newsgroups that have recently been killed by the user.")

(defvar gnus-active-hashtb nil
  "Hashtable of active articles.")

(defvar gnus-moderated-list nil
  "List of moderated newsgroups.")

(defvar gnus-group-marked nil)

(defvar gnus-current-startup-file nil
  "Startup file for the current host.")

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

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

(defvar gnus-current-select-method nil
  "The current method for selecting a newsgroup.")

(defvar gnus-group-list-mode nil)

(defvar gnus-article-internal-prepare-hook nil)

(defvar gnus-newsgroup-name nil)
(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)
(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)

(defvar gnus-newsgroup-unreads nil
  "List of unread articles in the current newsgroup.")

(defvar gnus-newsgroup-unselected nil
  "List of unselected unread articles in the current newsgroup.")

(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
  "List of ticked articles in the current newsgroup (a subset of unread art).")

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

(defvar gnus-newsgroup-cached nil
  "List of articles that come from the article cache.")

(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.")

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

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

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

(defvar gnus-newsgroup-dormant nil
  "List of dormant articles in the current newsgroup.")

(defvar gnus-newsgroup-scored nil
  "List of scored articles in the current newsgroup.")

(defvar gnus-newsgroup-headers nil
  "List of article headers in the current newsgroup.")

(defvar gnus-newsgroup-threads nil)

(defvar gnus-newsgroup-prepared nil
  "Whether the current group has been prepared properly.")

(defvar gnus-newsgroup-ancient nil
  "List of `gnus-fetch-old-headers' articles in the current newsgroup.")

(defvar gnus-newsgroup-sparse nil)

(defvar gnus-current-article nil)
(defvar gnus-article-current nil)
(defvar gnus-current-headers nil)
(defvar gnus-have-all-headers nil)
(defvar gnus-last-article nil)
(defvar gnus-newsgroup-history nil)
(defvar gnus-current-kill-article nil)

;; Save window configuration.
(defvar gnus-prev-winconf nil)

(defvar gnus-summary-mark-positions nil)
(defvar gnus-group-mark-positions nil)

(defvar gnus-reffed-article-number nil)

;;; Let the byte-compiler know that we know about this variable.
(defvar rmail-default-rmail-file)

(defvar gnus-cache-removable-articles nil)

(defvar gnus-dead-summary nil)

(defconst gnus-summary-local-variables
  '(gnus-newsgroup-name
    gnus-newsgroup-begin gnus-newsgroup-end
    gnus-newsgroup-last-rmail gnus-newsgroup-last-mail
    gnus-newsgroup-last-folder gnus-newsgroup-last-file
    gnus-newsgroup-auto-expire gnus-newsgroup-unreads
    gnus-newsgroup-unselected gnus-newsgroup-marked
    gnus-newsgroup-reads gnus-newsgroup-saved
    gnus-newsgroup-replied gnus-newsgroup-expirable
    gnus-newsgroup-processable gnus-newsgroup-killed
    gnus-newsgroup-bookmarks gnus-newsgroup-dormant
    gnus-newsgroup-headers gnus-newsgroup-threads
    gnus-newsgroup-prepared gnus-summary-highlight-line-function
    gnus-current-article gnus-current-headers gnus-have-all-headers
    gnus-last-article gnus-article-internal-prepare-hook
    gnus-newsgroup-dependencies gnus-newsgroup-selected-overlay
    gnus-newsgroup-scored gnus-newsgroup-kill-headers
    gnus-newsgroup-async 
    gnus-score-alist gnus-current-score-file gnus-summary-expunge-below
    gnus-summary-mark-below gnus-newsgroup-active gnus-scores-exclude-files
    gnus-newsgroup-history gnus-newsgroup-ancient
    gnus-newsgroup-sparse
    (gnus-newsgroup-adaptive . gnus-use-adaptive-scoring)
    gnus-newsgroup-adaptive-score-file
    (gnus-newsgroup-expunged-tally . 0)
    gnus-cache-removeable-articles gnus-newsgroup-cached
    gnus-newsgroup-data gnus-newsgroup-data-reverse
    gnus-newsgroup-limit gnus-newsgroup-limits)
  "Variables that are buffer-local to the summary buffers.")

(defconst gnus-bug-message
  "Sending a bug report to the Gnus Towers.
========================================

The buffer below is a mail buffer.  When you press `C-c C-c', it will
be sent to the Gnus Bug Exterminators.

At the bottom of the buffer you'll see lots of variable settings.
Please do not delete those.  They will tell the Bug People what your
environment is, so that it will be easier to locate the bugs.

If you have found a bug that makes Emacs go \"beep\", set
debug-on-error to t (`M-x set-variable RET debug-on-error RET t RET')
and include the backtrace in your bug report.

Please describe the bug in annoying, painstaking detail.

Thank you for your help in stamping out bugs.
")

;;; End of variables.

;; Define some autoload functions Gnus might use.
(eval-and-compile

  ;; This little mapcar goes through the list below and marks the
  ;; symbols in question as autoloaded functions.
  (mapcar
   (lambda (package)
     (let ((interactive (nth 1 (memq ':interactive package))))
       (mapcar
        (lambda (function)
          (let (keymap)
            (when (consp function)
              (setq keymap (car (memq 'keymap function)))
              (setq function (car function)))
            (autoload function (car package) nil interactive keymap)))
        (if (eq (nth 1 package) ':interactive)
            (cdddr package)
          (cdr package)))))
   '(("metamail" metamail-buffer)
     ("info" Info-goto-node)
     ("hexl" hexl-hex-string-to-integer)
     ("pp" pp pp-to-string pp-eval-expression)
     ("mail-extr" mail-extract-address-components)
     ("nnmail" nnmail-split-fancy nnmail-article-group)
     ("nnvirtual" nnvirtual-catchup-group)
     ("timezone" timezone-make-date-arpa-standard timezone-fix-time
      timezone-make-sortable-date timezone-make-time-string)
     ("sendmail" mail-position-on-field mail-setup)
     ("rmailout" rmail-output)
     ("rnewspost" news-mail-other-window news-reply-yank-original
      news-caesar-buffer-body)
     ("rmail" rmail-insert-rmail-file-header rmail-count-new-messages
      rmail-show-message)
     ("gnus-soup" :interactive t
      gnus-group-brew-soup gnus-brew-soup gnus-soup-add-article
      gnus-soup-send-replies gnus-soup-save-areas gnus-soup-pack-packet)
     ("nnsoup" nnsoup-pack-replies)
     ("gnus-mh" gnus-mh-mail-setup gnus-summary-save-article-folder
      gnus-Folder-save-name gnus-folder-save-name)
     ("gnus-mh" :interactive t gnus-summary-save-in-folder)
     ("gnus-vis" gnus-group-make-menu-bar gnus-summary-make-menu-bar
      gnus-server-make-menu-bar gnus-article-make-menu-bar
      gnus-browse-make-menu-bar gnus-highlight-selected-summary
      gnus-summary-highlight-line gnus-carpal-setup-buffer
      gnus-group-highlight-line
      gnus-article-add-button gnus-insert-next-page-button
      gnus-insert-prev-page-button gnus-visual-turn-off-edit-menu)
     ("gnus-vis" :interactive t
      gnus-article-push-button gnus-article-press-button
      gnus-article-highlight gnus-article-highlight-some
      gnus-article-highlight-headers gnus-article-highlight-signature
      gnus-article-add-buttons gnus-article-add-buttons-to-head
      gnus-article-next-button gnus-article-prev-button)
     ("gnus-demon" gnus-demon-add-nocem gnus-demon-add-scanmail
      gnus-demon-add-disconnection gnus-demon-add-handler
      gnus-demon-remove-handler)
     ("gnus-demon" :interactive t
      gnus-demon-init gnus-demon-cancel)
     ("gnus-salt" gnus-highlight-selected-tree gnus-possibly-generate-tree
      gnus-tree-open gnus-tree-close)
     ("gnus-nocem" gnus-nocem-scan-groups gnus-nocem-close)
     ("gnus-srvr" gnus-enter-server-buffer gnus-server-set-info)
     ("gnus-srvr" gnus-browse-foreign-server)
     ("gnus-cite" :interactive t
      gnus-article-highlight-citation gnus-article-hide-citation-maybe
      gnus-article-hide-citation gnus-article-fill-cited-article)
     ("gnus-kill" gnus-kill gnus-apply-kill-file-internal
      gnus-kill-file-edit-file gnus-kill-file-raise-followups-to-author
      gnus-execute gnus-expunge)
     ("gnus-cache" gnus-cache-possibly-enter-article gnus-cache-save-buffers
      gnus-cache-possibly-remove-articles gnus-cache-request-article
      gnus-cache-retrieve-headers gnus-cache-possibly-alter-active
      gnus-cache-enter-remove-article gnus-cached-article-p
      gnus-cache-open gnus-cache-close)
     ("gnus-cache" :interactive t gnus-jog-cache gnus-cache-enter-article
      gnus-cache-remove-article)
     ("gnus-score" :interactive t
      gnus-summary-increase-score gnus-summary-lower-score
      gnus-score-flush-cache gnus-score-close
      gnus-score-raise-same-subject-and-select
      gnus-score-raise-same-subject gnus-score-default
      gnus-score-raise-thread gnus-score-lower-same-subject-and-select
      gnus-score-lower-same-subject gnus-score-lower-thread
      gnus-possibly-score-headers)
     ("gnus-score"
      (gnus-summary-score-map keymap) gnus-score-save gnus-score-headers
      gnus-current-score-file-nondirectory gnus-score-adaptive
      gnus-score-find-trace gnus-score-file-name)
     ("gnus-edit" :interactive t gnus-score-customize)
     ("gnus-topic" :interactive t gnus-topic-mode)
     ("gnus-topic" gnus-topic-remove-group)
     ("gnus-salt" :interactive t gnus-pick-mode)
     ("gnus-uu" (gnus-uu-extract-map keymap) (gnus-uu-mark-map keymap))
     ("gnus-uu" :interactive t
      gnus-uu-digest-mail-forward gnus-uu-digest-post-forward
      gnus-uu-mark-series gnus-uu-mark-region gnus-uu-mark-buffer
      gnus-uu-mark-by-regexp gnus-uu-mark-all
      gnus-uu-mark-sparse gnus-uu-mark-thread gnus-uu-decode-uu
      gnus-uu-decode-uu-and-save gnus-uu-decode-unshar
      gnus-uu-decode-unshar-and-save gnus-uu-decode-save
      gnus-uu-decode-binhex gnus-uu-decode-uu-view
      gnus-uu-decode-uu-and-save-view gnus-uu-decode-unshar-view
      gnus-uu-decode-unshar-and-save-view gnus-uu-decode-save-view
      gnus-uu-decode-binhex-view)
     ("gnus-msg" (gnus-summary-send-map keymap)
      gnus-mail-yank-original gnus-mail-send-and-exit
      gnus-sendmail-setup-mail gnus-article-mail
      gnus-inews-message-id gnus-new-mail gnus-mail-reply)
     ("gnus-msg" :interactive t
      gnus-group-post-news gnus-group-mail gnus-summary-post-news
      gnus-summary-followup gnus-summary-followup-with-original
      gnus-summary-followup-and-reply
      gnus-summary-followup-and-reply-with-original
      gnus-summary-cancel-article gnus-summary-supersede-article
      gnus-post-news gnus-inews-news gnus-cancel-news
      gnus-summary-reply gnus-summary-reply-with-original
      gnus-summary-mail-forward gnus-summary-mail-other-window
      gnus-bug)
     ("gnus-picon" :interactive t gnus-article-display-picons
      gnus-group-display-picons gnus-picons-article-display-x-face)
     ("gnus-vm" gnus-vm-mail-setup)
     ("gnus-vm" :interactive t gnus-summary-save-in-vm
      gnus-summary-save-article-vm gnus-yank-article))))

\f

;; Fix by Hallvard B Furuseth <h.b.furuseth@usit.uio.no>.
;; If you want the cursor to go somewhere else, set these two
;; functions in some startup hook to whatever you want.
(defalias 'gnus-summary-position-point 'gnus-goto-colon)
(defalias 'gnus-group-position-point 'gnus-goto-colon)

;;; Various macros and substs.

(defun gnus-header-from (header)
  (mail-header-from header))

(defmacro gnus-eval-in-buffer-window (buffer &rest forms)
  "Pop to BUFFER, evaluate FORMS, and then return to the original window."
  `(let ((GnusStartBufferWindow (selected-window)))
     (unwind-protect
         (progn
           (pop-to-buffer ,buffer)
           ,@forms)
       (select-window GnusStartBufferWindow))))

(defmacro gnus-gethash (string hashtable)
  "Get hash value of STRING in HASHTABLE."
  `(symbol-value (intern-soft ,string ,hashtable)))

(defmacro gnus-sethash (string value hashtable)
  "Set hash value.  Arguments are STRING, VALUE, and HASHTABLE."
  `(set (intern ,string ,hashtable) ,value))

(defmacro gnus-intern-safe (string hashtable)
  "Set hash value.  Arguments are STRING, VALUE, and HASHTABLE."
  `(let ((symbol (intern ,string ,hashtable)))
     (or (boundp symbol)
         (set symbol nil))
     symbol))

(defmacro gnus-group-unread (group)
  "Get the currently computed number of unread articles in GROUP."
  `(car (gnus-gethash ,group gnus-newsrc-hashtb)))

(defmacro gnus-group-entry (group)
  "Get the newsrc entry for GROUP."
  `(gnus-gethash ,group gnus-newsrc-hashtb))

(defmacro gnus-active (group)
  "Get active info on GROUP."
  `(gnus-gethash ,group gnus-active-hashtb))

(defmacro gnus-set-active (group active)
  "Set GROUP's active info."
  `(gnus-sethash ,group ,active gnus-active-hashtb))

;; modified by MORIOKA Tomohiko <morioka@jaist.ac.jp>
;;   function `substring' might cut on a middle of multi-octet
;;   character.
(defun gnus-truncate-string (str width)
  (substring str 0 width))

;; Added by Geoffrey T. Dairiki <dairiki@u.washington.edu>.  A safe way
;; to limit the length of a string.  This function is necessary since
;; `(substr "abc" 0 30)' pukes with "Args out of range".
(defsubst gnus-limit-string (str width)
  (if (> (length str) width)
      (substring str 0 width)
    str))

(defsubst gnus-simplify-subject-re (subject)
  "Remove \"Re:\" from subject lines."
  (if (string-match "^[Rr][Ee]: *" subject)
      (substring subject (match-end 0))
    subject))

(defsubst gnus-goto-char (point)
  (and point (goto-char point)))

(defmacro gnus-buffer-exists-p (buffer)
  `(and ,buffer
        (funcall (if (stringp ,buffer) 'get-buffer 'buffer-name)
                 ,buffer)))

(defmacro gnus-kill-buffer (buffer)
  `(let ((buf ,buffer))
     (if (gnus-buffer-exists-p buf)
         (kill-buffer buf))))

(defsubst gnus-point-at-bol ()
  "Return point at the beginning of the line."
  (let ((p (point)))
    (beginning-of-line)
    (prog1
        (point)
      (goto-char p))))

(defsubst gnus-point-at-eol ()
  "Return point at the end of the line."
  (let ((p (point)))
    (end-of-line)
    (prog1
        (point)
      (goto-char p))))

;; Delete the current line (and the next N lines.);
(defmacro gnus-delete-line (&optional n)
  `(delete-region (progn (beginning-of-line) (point))
                  (progn (forward-line ,(or n 1)) (point))))

;; Suggested by Brian Edmonds <edmonds@cs.ubc.ca>.
(defvar gnus-init-inhibit nil)
(defun gnus-read-init-file (&optional inhibit-next)
  (if gnus-init-inhibit
      (setq gnus-init-inhibit nil)
    (setq gnus-init-inhibit inhibit-next)
    (and gnus-init-file
         (or (and (file-exists-p gnus-init-file)
                  ;; Don't try to load a directory.
                  (not (file-directory-p gnus-init-file)))
             (file-exists-p (concat gnus-init-file ".el"))
             (file-exists-p (concat gnus-init-file ".elc")))
         (condition-case var
             (load gnus-init-file nil t)
           (error
            (error "Error in %s: %s" gnus-init-file var))))))

;; Info access macros.

(defmacro gnus-info-group (info)
  `(nth 0 ,info))
(defmacro gnus-info-rank (info)
  `(nth 1 ,info))
(defmacro gnus-info-read (info)
  `(nth 2 ,info))
(defmacro gnus-info-marks (info)
  `(nth 3 ,info))
(defmacro gnus-info-method (info)
  `(nth 4 ,info))
(defmacro gnus-info-params (info)
  `(nth 5 ,info))

(defmacro gnus-info-level (info)
  `(let ((rank (gnus-info-rank ,info)))
     (if (consp rank)
         (car rank)
       rank)))
(defmacro gnus-info-score (info)
  `(let ((rank (gnus-info-rank ,info)))
     (or (and (consp rank) (cdr rank)) 0)))

(defmacro gnus-info-set-group (info group)
  `(setcar ,info ,group))
(defmacro gnus-info-set-rank (info rank)
  `(setcar (nthcdr 1 ,info) ,rank))
(defmacro gnus-info-set-read (info read)
  `(setcar (nthcdr 2 ,info) ,read))
(defmacro gnus-info-set-marks (info marks)
  `(setcar (nthcdr 3 ,info) ,marks))
(defmacro gnus-info-set-method (info method)
  `(setcar (nthcdr 4 ,info) ,method))
(defmacro gnus-info-set-params (info params)
  `(setcar (nthcdr 5 ,info) ,params))

(defmacro gnus-info-set-level (info level)
  `(let ((rank (cdr ,info)))
     (if (consp (car rank))
         (setcar (car rank) ,level)
       (setcar rank ,level))))
(defmacro gnus-info-set-score (info score)
  `(let ((rank (cdr ,info)))
     (if (consp (car rank))
         (setcdr (car rank) ,score)
       (setcar rank (cons (car rank) ,score)))))

(defmacro gnus-get-info (group)
  `(nth 2 (gnus-gethash ,group gnus-newsrc-hashtb)))

(defun gnus-byte-code (func)
  "Return a form that can be `eval'ed based on FUNC."
  (let ((fval (symbol-function func)))
    (if (byte-code-function-p fval)
        (let ((flist (append fval nil)))
          (setcar flist 'byte-code)
          flist)
      (cons 'progn (cdr (cdr fval))))))

;;; Load the compatability functions.

(require 'gnus-cus)
(require 'gnus-ems)

\f

;; Format specs.  The chunks below are the machine-generated forms
;; that are to be evaled as the result of the default format strings.
;; We write them in here to get them byte-compiled.  That way the
;; default actions will be quite fast, while still retaining the full
;; flexibility of the user-defined format specs.

;; First we have lots of dummy defvars to let the compiler know these
;; are really dynamic variables.

(defvar gnus-tmp-unread)
(defvar gnus-tmp-replied)
(defvar gnus-tmp-score-char)
(defvar gnus-tmp-indentation)
(defvar gnus-tmp-opening-bracket)
(defvar gnus-tmp-lines)
(defvar gnus-tmp-name)
(defvar gnus-tmp-closing-bracket)
(defvar gnus-tmp-subject-or-nil)
(defvar gnus-tmp-subject)
(defvar gnus-tmp-marked)
(defvar gnus-tmp-marked-mark)
(defvar gnus-tmp-subscribed)
(defvar gnus-tmp-process-marked)
(defvar gnus-tmp-number-of-unread)
(defvar gnus-tmp-group-name)
(defvar gnus-tmp-group)
(defvar gnus-tmp-article-number)
(defvar gnus-tmp-unread-and-unselected)
(defvar gnus-tmp-news-method)
(defvar gnus-tmp-news-server)
(defvar gnus-tmp-article-number)
(defvar gnus-mouse-face)
(defvar gnus-mouse-face-prop)

(defun gnus-summary-line-format-spec ()
  (insert gnus-tmp-unread gnus-tmp-replied
          gnus-tmp-score-char gnus-tmp-indentation)
  (put-text-property
   (point)
   (progn
     (insert
      gnus-tmp-opening-bracket
      (format "%4d: %-20s"
              gnus-tmp-lines
              (if (> (length gnus-tmp-name) 20)
                  (substring gnus-tmp-name 0 20)
                gnus-tmp-name))
      gnus-tmp-closing-bracket)
     (point))
   gnus-mouse-face-prop gnus-mouse-face)
  (insert " " gnus-tmp-subject-or-nil "\n"))

(defvar gnus-summary-line-format-spec
  (gnus-byte-code 'gnus-summary-line-format-spec))

(defun gnus-summary-dummy-line-format-spec ()
  (insert "*  ")
  (put-text-property
   (point)
   (progn
     (insert ":                          :")
     (point))
   gnus-mouse-face-prop gnus-mouse-face)
  (insert " " gnus-tmp-subject "\n"))

(defvar gnus-summary-dummy-line-format-spec
  (gnus-byte-code 'gnus-summary-dummy-line-format-spec))

(defun gnus-group-line-format-spec ()
  (insert gnus-tmp-marked-mark gnus-tmp-subscribed
          gnus-tmp-process-marked
          gnus-group-indentation
          (format "%5s: " gnus-tmp-number-of-unread))
  (put-text-property
   (point)
   (progn
     (insert gnus-tmp-group "\n")
     (1- (point)))
   gnus-mouse-face-prop gnus-mouse-face))
(defvar gnus-group-line-format-spec
  (gnus-byte-code 'gnus-group-line-format-spec))

(defvar gnus-format-specs
  `((version . ,emacs-version)
    (group ,gnus-group-line-format ,gnus-group-line-format-spec)
    (summary-dummy ,gnus-summary-dummy-line-format
                   ,gnus-summary-dummy-line-format-spec)
    (summary ,gnus-summary-line-format ,gnus-summary-line-format-spec)))

(defvar gnus-article-mode-line-format-spec nil)
(defvar gnus-summary-mode-line-format-spec nil)
(defvar gnus-group-mode-line-format-spec nil)

;;; Phew.  All that gruft is over, fortunately.

\f
;;;
;;; Gnus Utility Functions
;;;

(defun gnus-extract-address-components (from)
  (let (name address)
    ;; First find the address - the thing with the @ in it.  This may
    ;; not be accurate in mail addresses, but does the trick most of
    ;; the time in news messages.
    (if (string-match "\\b[^@ \t<>]+[!@][^@ \t<>]+\\b" from)
        (setq address (substring from (match-beginning 0) (match-end 0))))
    ;; Then we check whether the "name <address>" format is used.
    (and address
         ;; Fix by MORIOKA Tomohiko <morioka@jaist.ac.jp>
         ;; Linear white space is not required.
         (string-match (concat "[ \t]*<" (regexp-quote address) ">") from)
         (and (setq name (substring from 0 (match-beginning 0)))
              ;; Strip any quotes from the name.
              (string-match "\".*\"" name)
              (setq name (substring name 1 (1- (match-end 0))))))
    ;; If not, then "address (name)" is used.
    (or name
        (and (string-match "(.+)" from)
             (setq name (substring from (1+ (match-beginning 0))
                                   (1- (match-end 0)))))
        (and (string-match "()" from)
             (setq name address))
        ;; Fix by MORIOKA Tomohiko <morioka@jaist.ac.jp>.
        ;; XOVER might not support folded From headers.
        (and (string-match "(.*" from)
             (setq name (substring from (1+ (match-beginning 0))
                                   (match-end 0)))))
    ;; Fix by Hallvard B Furuseth <h.b.furuseth@usit.uio.no>.
    (list (or name from) (or address from))))

(defun gnus-fetch-field (field)
  "Return the value of the header FIELD of current article."
  (save-excursion
    (save-restriction
      (let ((case-fold-search t))
        (nnheader-narrow-to-headers)
        (mail-fetch-field field)))))

(defun gnus-goto-colon ()
  (beginning-of-line)
  (search-forward ":" (gnus-point-at-eol) t))

;;;###autoload
(defun gnus-update-format (var)
  "Update the format specification near point."
  (interactive
   (list
    (save-excursion
      (eval-defun nil)
      ;; Find the end of the current word.
      (re-search-forward "[ \t\n]" nil t)
      ;; Search backward.
      (when (re-search-backward "\\(gnus-[-a-z]+-line-format\\)" nil t)
        (match-string 1)))))
  (let* ((type (intern (progn (string-match "gnus-\\([-a-z]+\\)-line" var)
                              (match-string 1 var))))
         (entry (assq type gnus-format-specs))
         value spec)
    (when entry
      (setq gnus-format-specs (delq entry gnus-format-specs)))
    (set
     (intern (format "%s-spec" var))
     (gnus-parse-format (setq value (symbol-value (intern var)))
                        (symbol-value (intern (format "%s-alist" var)))
                        (not (string-match "mode" var))))
    (setq spec (symbol-value (intern (format "%s-spec" var))))
    (push (list type value spec) gnus-format-specs)

    (pop-to-buffer "*Gnus Format*")
    (erase-buffer)
    (lisp-interaction-mode)
    (insert (pp-to-string spec))))


(defun gnus-update-format-specifications (&optional force)
  "Update all (necessary) format specifications."
  ;; Make the indentation array.
  (gnus-make-thread-indent-array)

  ;; See whether all the stored info needs to be flushed.
  (when (or force
            (not (equal emacs-version
                        (cdr (assq 'version gnus-format-specs)))))
    (setq gnus-format-specs nil))

  ;; Go through all the formats and see whether they need updating.
  (let ((types '(summary summary-dummy group
                         summary-mode group-mode article-mode))
        new-format entry type val)
    (while (setq type (pop types))
      (setq new-format (symbol-value
                        (intern (format "gnus-%s-line-format" type))))
      (setq entry (cdr (assq type gnus-format-specs)))
      (if (and entry
               (equal (car entry) new-format))
          ;; Use the old format.
          (set (intern (format "gnus-%s-line-format-spec" type))
               (cadr entry))
        ;; This is a new format.
        (setq val
              (if (not (stringp new-format))
                  ;; This is a function call or something.
                  new-format
                ;; This is a "real" format.
                (gnus-parse-format
                 new-format
                 (symbol-value
                  (intern (format "gnus-%s-line-format-alist"
                                  (if (eq type 'article-mode)
                                      'summary-mode type))))
                 (not (string-match "mode$" (symbol-name type))))))
        ;; Enter the new format spec into the list.
        (if entry
            (progn
              (setcar (cdr entry) val)
              (setcar entry new-format))
          (push (list type new-format val) gnus-format-specs))
        (set (intern (format "gnus-%s-line-format-spec" type)) val))))

  (gnus-update-group-mark-positions)
  (gnus-update-summary-mark-positions)

  ;; See whether we need to read the description file.
  (if (and (string-match "%[-,0-9]*D" gnus-group-line-format)
           (not gnus-description-hashtb)
           gnus-read-active-file)
      (gnus-read-all-descriptions-files)))

(defun gnus-update-summary-mark-positions ()
  "Compute where the summary marks are to go."
  (save-excursion
    (let ((gnus-replied-mark 129)
          (gnus-score-below-mark 130)
          (gnus-score-over-mark 130)
          (thread nil)
          (gnus-visual nil)
          pos)
      (gnus-set-work-buffer)
      (gnus-summary-insert-line
       [0 "" "" "" "" "" 0 0 ""]  0 nil 128 t nil "" nil 1)
      (goto-char (point-min))
      (setq pos (list (cons 'unread (and (search-forward "\200" nil t)
                                         (- (point) 2)))))
      (goto-char (point-min))
      (setq pos (cons (cons 'replied (and (search-forward "\201" nil t)
                                          (- (point) 2))) pos))
      (goto-char (point-min))
      (setq pos (cons (cons 'score (and (search-forward "\202" nil t)
                                        (- (point) 2))) pos))
      (setq gnus-summary-mark-positions pos))))

(defun gnus-update-group-mark-positions ()
  (save-excursion
    (let ((gnus-process-mark 128)
          (gnus-group-marked '("dummy.group")))
      (gnus-set-active "dummy.group" '(0 . 0))
      (gnus-set-work-buffer)
      (gnus-group-insert-group-line "dummy.group" 0 nil 0 nil)
      (goto-char (point-min))
      (setq gnus-group-mark-positions
            (list (cons 'process (and (search-forward "\200" nil t)
                                      (- (point) 2))))))))

(defvar gnus-mouse-face-0 'highlight)
(defvar gnus-mouse-face-1 'highlight)
(defvar gnus-mouse-face-2 'highlight)
(defvar gnus-mouse-face-3 'highlight)
(defvar gnus-mouse-face-4 'highlight)

(defun gnus-mouse-face-function (form type)
  `(put-text-property
    (point) (progn ,@form (point))
    gnus-mouse-face-prop
    ,(if (equal type 0)
         'gnus-mouse-face
       `(quote ,(symbol-value (intern (format "gnus-mouse-face-%d" type)))))))

(defvar gnus-face-0 'bold)
(defvar gnus-face-1 'italic)
(defvar gnus-face-2 'bold-italic)
(defvar gnus-face-3 'bold)
(defvar gnus-face-4 'bold)

(defun gnus-face-face-function (form type)
  `(put-text-property
    (point) (progn ,@form (point))
    'face ',(symbol-value (intern (format "gnus-face-%d" type)))))

(defun gnus-max-width-function (el max-width)
  (or (numberp max-width) (signal 'wrong-type-argument '(numberp max-width)))
  (if (symbolp el)
      `(if (> (length ,el) ,max-width)
           (substring ,el 0 ,max-width)
         ,el)
    `(let ((val (eval ,el)))
       (if (numberp val)
           (setq val (int-to-string val)))
       (if (> (length val) ,max-width)
           (substring val 0 ,max-width)
         val))))

(defun gnus-parse-format (format spec-alist &optional insert)
  ;; This function parses the FORMAT string with the help of the
  ;; SPEC-ALIST and returns a list that can be eval'ed to return the
  ;; string.  If the FORMAT string contains the specifiers %( and %)
  ;; the text between them will have the mouse-face text property.
  (if (string-match
       "\\`\\(.*\\)%[0-9]?[{(]\\(.*\\)%[0-9]?[})]\\(.*\n?\\)\\'"
       format)
      (gnus-parse-complex-format format spec-alist)
    ;; This is a simple format.
    (gnus-parse-simple-format format spec-alist insert)))

(defun gnus-parse-complex-format (format spec-alist)
  (save-excursion
    (gnus-set-work-buffer)
    (insert format)
    (goto-char (point-min))
    (while (re-search-forward "\"" nil t)
      (replace-match "\\\"" nil t))
    (goto-char (point-min))
    (insert "(\"")
    (while (re-search-forward "%\\([0-9]+\\)?\\([{}()]\\)" nil t)
      (let ((number (if (match-beginning 1)
                        (match-string 1) "0"))
            (delim (aref (match-string 2) 0)))
        (if (or (= delim ?\() (= delim ?\{))
            (replace-match (concat "\"(" (if (= delim ?\() "mouse" "face")
                                   " " number " \""))
          (replace-match "\")\""))))
    (goto-char (point-max))
    (insert "\")")
    (goto-char (point-min))
    (let ((form (read (current-buffer))))
      (cons 'progn (gnus-complex-form-to-spec form spec-alist)))))

(defun gnus-complex-form-to-spec (form spec-alist)
  (delq nil
        (mapcar
         (lambda (sform)
           (if (stringp sform)
               (gnus-parse-simple-format sform spec-alist t)
             (funcall (intern (format "gnus-%s-face-function"
                                      (car sform)))
                      (gnus-complex-form-to-spec
                       (cdr (cdr sform)) spec-alist)
                      (nth 1 sform))))
         form)))

(defun gnus-parse-simple-format (format spec-alist &optional insert)
  ;; This function parses the FORMAT string with the help of the
  ;; SPEC-ALIST and returns a list that can be eval'ed to return a
  ;; string.
  (let ((max-width 0)
        spec flist fstring newspec elem beg result dontinsert)
    (save-excursion
      (gnus-set-work-buffer)
      (insert format)
      (goto-char (point-min))
      (while (re-search-forward "%[-0-9]*\\(,[0-9]+\\)?\\([^0-9]\\)\\(.\\)?"
                                nil t)
        (if (= (setq spec (string-to-char (match-string 2))) ?%)
              (setq newspec "%"
                    beg (1+ (match-beginning 0)))
          ;; First check if there are any specs that look anything like
          ;; "%12,12A", ie. with a "max width specification".  These have
          ;; to be treated specially.
          (if (setq beg (match-beginning 1))
              (setq max-width
                    (string-to-int
                     (buffer-substring
                      (1+ (match-beginning 1)) (match-end 1))))
            (setq max-width 0)
            (setq beg (match-beginning 2)))
          ;; Find the specification from `spec-alist'.
          (unless (setq elem (cdr (assq spec spec-alist)))
            (setq elem '("*" ?s)))
          ;; Treat user defined format specifiers specially.
          (when (eq (car elem) 'gnus-tmp-user-defined)
            (setq elem
                  (list
                   (list (intern (concat "gnus-user-format-function-"
                                         (match-string 3)))
                         'gnus-tmp-header) ?s))
            (delete-region (match-beginning 3) (match-end 3)))
          (if (not (zerop max-width))
              (let ((el (car elem)))
                (cond ((= (car (cdr elem)) ?c)
                       (setq el (list 'char-to-string el)))
                      ((= (car (cdr elem)) ?d)
                       (setq el (list 'int-to-string el))))
                (setq flist (cons (gnus-max-width-function el max-width)
                                  flist))
                (setq newspec ?s))
            (progn
              (setq flist (cons (car elem) flist))
              (setq newspec (car (cdr elem))))))
        ;; Remove the old specification (and possibly a ",12" string).
        (delete-region beg (match-end 2))
        ;; Insert the new specification.
        (goto-char beg)
        (insert newspec))
      (setq fstring (buffer-substring 1 (point-max))))
    ;; Do some postprocessing to increase efficiency.
    (setq
     result
     (cond
      ;; Emptyness.
      ((string= fstring "")
       nil)
      ;; Not a format string.
      ((not (string-match "%" fstring))
       (list fstring))
      ;; A format string with just a single string spec.
      ((string= fstring "%s")
       (list (car flist)))
      ;; A single character.
      ((string= fstring "%c")
       (list (car flist)))
      ;; A single number.
      ((string= fstring "%d")
       (setq dontinsert)
       (if insert
           (list `(princ ,(car flist)))
         (list `(int-to-string ,(car flist)))))
      ;; Just lots of chars and strings.
      ((string-match "\\`\\(%[cs]\\)+\\'" fstring)
       (nreverse flist))
      ;; A single string spec at the beginning of the spec.
      ((string-match "\\`%[sc][^%]+\\'" fstring)
       (list (car flist) (substring fstring 2)))
      ;; A single string spec in the middle of the spec.
      ((string-match "\\`\\([^%]+\\)%[sc]\\([^%]+\\)\\'" fstring)
       (list (match-string 1 fstring) (car flist) (match-string 2 fstring)))
      ;; A single string spec in the end of the spec.
      ((string-match "\\`\\([^%]+\\)%[sc]\\'" fstring)
       (list (match-string 1 fstring) (car flist)))
      ;; A more complex spec.
      (t
       (list (cons 'format (cons fstring (nreverse flist)))))))

    (if insert
        (when result
          (if dontinsert
              result
            (cons 'insert result)))
      (cond ((stringp result)
             result)
            ((consp result)
             (cons 'concat result))
            (t "")))))

(defun gnus-eval-format (format &optional alist props)
  "Eval the format variable FORMAT, using ALIST.
If PROPS, insert the result."
  (let ((form (gnus-parse-format format alist props)))
    (if props
        (add-text-properties (point) (progn (eval form) (point)) props)
      (eval form))))

(defun gnus-remove-text-with-property (prop)
  "Delete all text in the current buffer with text property PROP."
  (save-excursion
    (goto-char (point-min))
    (while (not (eobp))
      (while (get-text-property (point) prop)
        (delete-char 1))
      (goto-char (next-single-property-change (point) prop nil (point-max))))))

(defun gnus-set-work-buffer ()
  (if (get-buffer gnus-work-buffer)
      (progn
        (set-buffer gnus-work-buffer)
        (erase-buffer))
    (set-buffer (get-buffer-create gnus-work-buffer))
    (kill-all-local-variables)
    (buffer-disable-undo (current-buffer))
    (gnus-add-current-to-buffer-list)))

;; Article file names when saving.

(defun gnus-Numeric-save-name (newsgroup headers &optional last-file)
  "Generate file name from NEWSGROUP, HEADERS, and optional LAST-FILE.
If variable `gnus-use-long-file-name' is nil, it is ~/News/News.group/num.
Otherwise, it is like ~/News/news/group/num."
  (let ((default
          (expand-file-name
           (concat (if (gnus-use-long-file-name 'not-save)
                       (gnus-capitalize-newsgroup newsgroup)
                     (gnus-newsgroup-directory-form newsgroup))
                   "/" (int-to-string (mail-header-number headers)))
           (or gnus-article-save-directory "~/News"))))
    (if (and last-file
             (string-equal (file-name-directory default)
                           (file-name-directory last-file))
             (string-match "^[0-9]+$" (file-name-nondirectory last-file)))
        default
      (or last-file default))))

(defun gnus-numeric-save-name (newsgroup headers &optional last-file)
  "Generate file name from NEWSGROUP, HEADERS, and optional LAST-FILE.
If variable `gnus-use-long-file-name' is non-nil, it is
~/News/news.group/num.  Otherwise, it is like ~/News/news/group/num."
  (let ((default
          (expand-file-name
           (concat (if (gnus-use-long-file-name 'not-save)
                       newsgroup
                     (gnus-newsgroup-directory-form newsgroup))
                   "/" (int-to-string (mail-header-number headers)))
           (or gnus-article-save-directory "~/News"))))
    (if (and last-file
             (string-equal (file-name-directory default)
                           (file-name-directory last-file))
             (string-match "^[0-9]+$" (file-name-nondirectory last-file)))
        default
      (or last-file default))))

(defun gnus-Plain-save-name (newsgroup headers &optional last-file)
  "Generate file name from NEWSGROUP, HEADERS, and optional LAST-FILE.
If variable `gnus-use-long-file-name' is non-nil, it is
~/News/News.group.  Otherwise, it is like ~/News/news/group/news."
  (or last-file
      (expand-file-name
       (if (gnus-use-long-file-name 'not-save)
           (gnus-capitalize-newsgroup newsgroup)
         (concat (gnus-newsgroup-directory-form newsgroup) "/news"))
       (or gnus-article-save-directory "~/News"))))

(defun gnus-plain-save-name (newsgroup headers &optional last-file)
  "Generate file name from NEWSGROUP, HEADERS, and optional LAST-FILE.
If variable `gnus-use-long-file-name' is non-nil, it is
~/News/news.group.  Otherwise, it is like ~/News/news/group/news."
  (or last-file
      (expand-file-name
       (if (gnus-use-long-file-name 'not-save)
           newsgroup
         (concat (gnus-newsgroup-directory-form newsgroup) "/news"))
       (or gnus-article-save-directory "~/News"))))

;; For subscribing new newsgroup

(defun gnus-subscribe-hierarchical-interactive (groups)
  (let ((groups (sort groups 'string<))
        prefixes prefix start ans group starts)
    (while groups
      (setq prefixes (list "^"))
      (while (and groups prefixes)
        (while (not (string-match (car prefixes) (car groups)))
          (setq prefixes (cdr prefixes)))
        (setq prefix (car prefixes))
        (setq start (1- (length prefix)))
        (if (and (string-match "[^\\.]\\." (car groups) start)
                 (cdr groups)
                 (setq prefix
                       (concat "^" (substring (car groups) 0 (match-end 0))))
                 (string-match prefix (car (cdr groups))))
            (progn
              (setq prefixes (cons prefix prefixes))
              (message "Descend hierarchy %s? ([y]nsq): "
                       (substring prefix 1 (1- (length prefix))))
              (setq ans (read-char))
              (cond ((= ans ?n)
                     (while (and groups
                                 (string-match prefix
                                               (setq group (car groups))))
                       (setq gnus-killed-list
                             (cons group gnus-killed-list))
                       (gnus-sethash group group gnus-killed-hashtb)
                       (setq groups (cdr groups)))
                     (setq starts (cdr starts)))
                    ((= ans ?s)
                     (while (and groups
                                 (string-match prefix
                                               (setq group (car groups))))
                       (gnus-sethash group group gnus-killed-hashtb)
                       (gnus-subscribe-alphabetically (car groups))
                       (setq groups (cdr groups)))
                     (setq starts (cdr starts)))
                    ((= ans ?q)
                     (while groups
                       (setq group (car groups))
                       (setq gnus-killed-list (cons group gnus-killed-list))
                       (gnus-sethash group group gnus-killed-hashtb)
                       (setq groups (cdr groups))))
                    (t nil)))
          (message "Subscribe %s? ([n]yq)" (car groups))
          (setq ans (read-char))
          (setq group (car groups))
          (cond ((= ans ?y)
                 (gnus-subscribe-alphabetically (car groups))
                 (gnus-sethash group group gnus-killed-hashtb))
                ((= ans ?q)
                 (while groups
                   (setq group (car groups))
                   (setq gnus-killed-list (cons group gnus-killed-list))
                   (gnus-sethash group group gnus-killed-hashtb)
                   (setq groups (cdr groups))))
                (t
                 (setq gnus-killed-list (cons group gnus-killed-list))
                 (gnus-sethash group group gnus-killed-hashtb)))
          (setq groups (cdr groups)))))))

(defun gnus-subscribe-randomly (newsgroup)
  "Subscribe new NEWSGROUP by making it the first newsgroup."
  (gnus-subscribe-newsgroup newsgroup))

(defun gnus-subscribe-alphabetically (newgroup)
  "Subscribe new NEWSGROUP and insert it in alphabetical order."
  (let ((groups (cdr gnus-newsrc-alist))
        before)
    (while (and (not before) groups)
      (if (string< newgroup (car (car groups)))
          (setq before (car (car groups)))
        (setq groups (cdr groups))))
    (gnus-subscribe-newsgroup newgroup before)))

(defun gnus-subscribe-hierarchically (newgroup)
  "Subscribe new NEWSGROUP and insert it in hierarchical newsgroup order."
  ;; Basic ideas by mike-w@cs.aukuni.ac.nz (Mike Williams)
  (save-excursion
    (set-buffer (find-file-noselect gnus-current-startup-file))
    (let ((groupkey newgroup)
          before)
      (while (and (not before) groupkey)
        (goto-char (point-min))
        (let ((groupkey-re
               (concat "^\\(" (regexp-quote groupkey) ".*\\)[!:]")))
          (while (and (re-search-forward groupkey-re nil t)
                      (progn
                        (setq before (match-string 1))
                        (string< before newgroup)))))
        ;; Remove tail of newsgroup name (eg. a.b.c -> a.b)
        (setq groupkey
              (if (string-match "^\\(.*\\)\\.[^.]+$" groupkey)
                  (substring groupkey (match-beginning 1) (match-end 1)))))
      (gnus-subscribe-newsgroup newgroup before))))

(defun gnus-subscribe-interactively (group)
  "Subscribe the new GROUP interactively.
It is inserted in hierarchical newsgroup order if subscribed.  If not,
it is killed."
  (if (gnus-y-or-n-p (format "Subscribe new newsgroup: %s " group))
      (gnus-subscribe-hierarchically group)
    (push group gnus-killed-list)))

(defun gnus-subscribe-zombies (group)
  "Make the new GROUP into a zombie group."
  (push group gnus-zombie-list))

(defun gnus-subscribe-killed (group)
  "Make the new GROUP a killed group."
  (push group gnus-killed-list))

(defun gnus-subscribe-newsgroup (newsgroup &optional next)
  "Subscribe new NEWSGROUP.
If NEXT is non-nil, it is inserted before NEXT.  Otherwise it is made
the first newsgroup."
  ;; We subscribe the group by changing its level to `subscribed'.
  (gnus-group-change-level
   newsgroup gnus-level-default-subscribed
   gnus-level-killed (gnus-gethash (or next "dummy.group") gnus-newsrc-hashtb))
  (gnus-message 5 "Subscribe newsgroup: %s" newsgroup))

;; For directories

(defun gnus-newsgroup-directory-form (newsgroup)
  "Make hierarchical directory name from NEWSGROUP name."
  (let ((newsgroup (gnus-newsgroup-savable-name newsgroup))
        (len (length newsgroup))
        idx)
    ;; If this is a foreign group, we don't want to translate the
    ;; entire name.
    (if (setq idx (string-match ":" newsgroup))
        (aset newsgroup idx ?/)
      (setq idx 0))
    ;; Replace all occurrences of `.' with `/'.
    (while (< idx len)
      (if (= (aref newsgroup idx) ?.)
          (aset newsgroup idx ?/))
      (setq idx (1+ idx)))
    newsgroup))

(defun gnus-newsgroup-savable-name (group)
  ;; Replace any slashes in a group name (eg. an ange-ftp nndoc group)
  ;; with dots.
  (nnheader-replace-chars-in-string group ?/ ?.))

(defun gnus-make-directory (dir)
  "Make DIRECTORY recursively."
  ;; Why don't we use `(make-directory dir 'parents)'?  That's just one
  ;; of the many mysteries of the universe.
  (let* ((dir (expand-file-name dir default-directory))
         dirs err)
    (if (string-match "/$" dir)
        (setq dir (substring dir 0 (match-beginning 0))))
    ;; First go down the path until we find a directory that exists.
    (while (not (file-exists-p dir))
      (setq dirs (cons dir dirs))
      (string-match "/[^/]+$" dir)
      (setq dir (substring dir 0 (match-beginning 0))))
    ;; Then create all the subdirs.
    (while (and dirs (not err))
      (condition-case ()
          (make-directory (car dirs))
        (error (setq err t)))
      (setq dirs (cdr dirs)))
    ;; We return whether we were successful or not.
    (not dirs)))

(defun gnus-capitalize-newsgroup (newsgroup)
  "Capitalize NEWSGROUP name."
  (and (not (zerop (length newsgroup)))
       (concat (char-to-string (upcase (aref newsgroup 0)))
               (substring newsgroup 1))))

;; Various... things.

(defun gnus-simplify-subject (subject &optional re-only)
  "Remove `Re:' and words in parentheses.
If RE-ONLY is non-nil, strip leading `Re:'s only."
  (let ((case-fold-search t))           ;Ignore case.
    ;; Remove `Re:', `Re^N:', `Re(n)', and `Re[n]:'.
    (when (string-match "\\`\\(re\\([[(^][0-9]+[])]?\\)?:[ \t]*\\)+" subject)
      (setq subject (substring subject (match-end 0))))
    ;; Remove uninteresting prefixes.
    (if (and (not re-only)
             gnus-simplify-ignored-prefixes
             (string-match gnus-simplify-ignored-prefixes subject))
        (setq subject (substring subject (match-end 0))))
    ;; Remove words in parentheses from end.
    (unless re-only
      (while (string-match "[ \t\n]*([^()]*)[ \t\n]*\\'" subject)
        (setq subject (substring subject 0 (match-beginning 0)))))
    ;; Return subject string.
    subject))

;; Remove any leading "re:"s, any trailing paren phrases, and simplify
;; all whitespace.
;; Written by Stainless Steel Rat <ratinox@ccs.neu.edu>.
(defun gnus-simplify-buffer-fuzzy ()
  (goto-char (point-min))
  (re-search-forward "^[ \t]*\\(re\\|fwd\\)[[{(^0-9]*[])}]?[:;][ \t]*" nil t)
  (goto-char (match-beginning 0))
  (while (or
          (looking-at "^[ \t]*\\(re\\|fwd\\)[[{(^0-9]*[])}]?[:;][ \t]*")
          (looking-at "^[[].*:[ \t].*[]]$"))
    (goto-char (point-min))
    (while (re-search-forward "^[ \t]*\\(re\\|fwd\\)[[{(^0-9]*[])}]?[:;][ \t]*"
                              nil t)
      (replace-match "" t t))
    (goto-char (point-min))
    (while (re-search-forward "^[[].*:[ \t].*[]]$" nil t)
      (goto-char (match-end 0))
      (delete-char -1)
      (delete-region
       (progn (goto-char (match-beginning 0)))
       (re-search-forward ":"))))
  (goto-char (point-min))
  (while (re-search-forward "[ \t\n]*[[{(][^()]*[]})][ \t]*$" nil t)
    (replace-match "" t t))
  (goto-char (point-min))
  (while (re-search-forward "[ \t]+" nil t)
    (replace-match " " t t))
  (goto-char (point-min))
  (while (re-search-forward "[ \t]+$" nil t)
    (replace-match "" t t))
  (goto-char (point-min))
  (while (re-search-forward "^[ \t]+" nil t)
    (replace-match "" t t))
  (goto-char (point-min))
  (if gnus-simplify-subject-fuzzy-regexp
      (if (listp gnus-simplify-subject-fuzzy-regexp)
          (let ((list gnus-simplify-subject-fuzzy-regexp))
            (while list
              (goto-char (point-min))
              (while (re-search-forward (car list) nil t)
                (replace-match "" t t))
              (setq list (cdr list))))
        (while (re-search-forward gnus-simplify-subject-fuzzy-regexp nil t)
          (replace-match "" t t)))))

(defun gnus-simplify-subject-fuzzy (subject)
  "Siplify a subject string fuzzily."
  (save-excursion
    (gnus-set-work-buffer)
    (let ((case-fold-search t))
      (insert subject)
      (inline (gnus-simplify-buffer-fuzzy))
      (buffer-string))))

;; Add the current buffer to the list of buffers to be killed on exit.
(defun gnus-add-current-to-buffer-list ()
  (or (memq (current-buffer) gnus-buffer-list)
      (setq gnus-buffer-list (cons (current-buffer) gnus-buffer-list))))

(defun gnus-string> (s1 s2)
  (not (or (string< s1 s2)
           (string= s1 s2))))

;;; General various misc type functions.

(defun gnus-clear-system ()
  "Clear all variables and buffers."
  ;; Clear Gnus variables.
  (let ((variables gnus-variable-list))
    (while variables
      (set (car variables) nil)
      (setq variables (cdr variables))))
  ;; Clear other internal variables.
  (setq gnus-list-of-killed-groups nil
        gnus-have-read-active-file nil
        gnus-newsrc-alist nil
        gnus-newsrc-hashtb nil
        gnus-killed-list nil
        gnus-zombie-list nil
        gnus-killed-hashtb nil
        gnus-active-hashtb nil
        gnus-moderated-list nil
        gnus-description-hashtb nil
        gnus-newsgroup-headers nil
        gnus-newsgroup-name nil
        gnus-server-alist nil
        gnus-opened-servers nil
        gnus-current-select-method nil)
  ;; Reset any score variables.
  (and gnus-use-scoring (gnus-score-close))
  ;; Kill the startup file.
  (and gnus-current-startup-file
       (get-file-buffer gnus-current-startup-file)
       (kill-buffer (get-file-buffer gnus-current-startup-file)))
  ;; Save any cache buffers.
  (and gnus-use-cache (gnus-cache-save-buffers))
  ;; Clear the dribble buffer.
  (gnus-dribble-clear)
  ;; Close down NoCeM.
  (and gnus-use-nocem (gnus-nocem-close))
  ;; Shut down the demons.
  (and gnus-use-demon (gnus-demon-cancel))
  ;; Kill global KILL file buffer.
  (if (get-file-buffer (gnus-newsgroup-kill-file nil))
      (kill-buffer (get-file-buffer (gnus-newsgroup-kill-file nil))))
  (gnus-kill-buffer nntp-server-buffer)
  ;; Backlog.
  (and gnus-keep-backlog (gnus-backlog-shutdown))
  ;; Kill Gnus buffers.
  (while gnus-buffer-list
    (gnus-kill-buffer (car gnus-buffer-list))
    (setq gnus-buffer-list (cdr gnus-buffer-list))))

(defun gnus-windows-old-to-new (setting)
  ;; First we take care of the really, really old Gnus 3 actions.
  (if (symbolp setting)
      (setq setting
            (cond ((memq setting '(SelectArticle))
                   'article)
                  ((memq setting '(SelectSubject ExpandSubject))
                   'summary)
                  ((memq setting '(SelectNewsgroup ExitNewsgroup))
                   'group)
                  (t setting))))
  (if (or (listp setting)
          (not (and gnus-window-configuration
                    (memq setting '(group summary article)))))
      setting
    (let* ((setting (if (eq setting 'group)
                        (if (assq 'newsgroup gnus-window-configuration)
                            'newsgroup
                          'newsgroups) setting))
           (elem (car (cdr (assq setting gnus-window-configuration))))
           (total (apply '+ elem))
           (types '(group summary article))
           (pbuf (if (eq setting 'newsgroups) 'group 'summary))
           (i 0)
           perc
           out)
      (while (< i 3)
        (or (not (numberp (nth i elem)))
            (zerop (nth i elem))
            (progn
              (setq perc  (/ (float (nth 0 elem)) total))
              (setq out (cons (if (eq pbuf (nth i types))
                                  (vector (nth i types) perc 'point)
                                (vector (nth i types) perc))
                              out))))
        (setq i (1+ i)))
      (list (nreverse out)))))

(defun gnus-add-configuration (conf)
  "Add the window configuration CONF to `gnus-buffer-configuration'."
  (setq gnus-buffer-configuration
        (cons conf (delq (assq (car conf) gnus-buffer-configuration)
                         gnus-buffer-configuration))))

(defvar gnus-frame-list nil)

(defun gnus-configure-frame (split &optional window)
  "Split WINDOW according to SPLIT."
  (unless window
    (setq window (get-buffer-window (current-buffer))))
  (select-window window)
  ;; This might be an old-stylee buffer config.
  (when (vectorp split)
    (setq split (append split nil)))
  (when (or (consp (car split))
            (vectorp (car split)))
    (push 1.0 split)
    (push 'vertical split))
  ;; The SPLIT might be something that is to be evaled to
  ;; return a new SPLIT.
  (while (and (not (assq (car split) gnus-window-to-buffer))
              (gnus-functionp (car split)))
    (setq split (eval split)))
  (let* ((type (car split))
         (subs (cddr split))
         (len (if (eq type 'horizontal) (window-width) (window-height)))
         (total 0)
         (window-min-width (or gnus-window-min-width window-min-width))
         (window-min-height (or gnus-window-min-height window-min-height))
         s result new-win rest comp-subs size sub)
    (cond
     ;; Nothing to do here.
     ((null split))
     ;; Don't switch buffers.
     ((null type)
      (and (memq 'point split) window))
     ;; This is a buffer to be selected.
     ((not (memq type '(frame horizontal vertical)))
      (let ((buffer (cond ((stringp type) type)
                          (t (cdr (assq type gnus-window-to-buffer)))))
            buf)
        (unless buffer
          (error "Illegal buffer type: %s" type))
        (unless (setq buf (get-buffer (if (symbolp buffer)
                                          (symbol-value buffer) buffer)))
          (setq buf (get-buffer-create (if (symbolp buffer)
                                           (symbol-value buffer) buffer))))
        (switch-to-buffer buf)
        ;; We return the window if it has the `point' spec.
        (and (memq 'point split) window)))
     ;; This is a frame split.
     ((eq type 'frame)
      (unless gnus-frame-list
        (setq gnus-frame-list (list (window-frame
                                     (get-buffer-window (current-buffer))))))
      (let ((i 0)
            params frame fresult)
        (while (< i (length subs))
          ;; Frame parameter is gotten from the sub-split.
          (setq params (cadr (elt subs i)))
          ;; It should be a list.
          (unless (listp params)
            (setq params nil))
          ;; Create a new frame?
          (unless (setq frame (elt gnus-frame-list i))
            (nconc gnus-frame-list (list (setq frame (make-frame params)))))
          ;; Is the old frame still alive?
          (unless (frame-live-p frame)
            (setcar (nthcdr i gnus-frame-list)
                    (setq frame (make-frame params))))
          ;; Select the frame in question and do more splits there.
          (select-frame frame)
          (setq fresult (or (gnus-configure-frame (elt subs i)) fresult))
          (incf i))
        ;; Select the frame that has the selected buffer.
        (when fresult
          (select-frame (window-frame fresult)))))
     ;; This is a normal split.
     (t
      (when (> (length subs) 0)
        ;; First we have to compute the sizes of all new windows.
        (while subs
          (setq sub (append (pop subs) nil))
          (while (and (not (assq (car sub) gnus-window-to-buffer))
                      (gnus-functionp (car sub)))
            (setq sub (eval sub)))
          (when sub
            (push sub comp-subs)
            (setq size (cadar comp-subs))
            (cond ((equal size 1.0)
                   (setq rest (car comp-subs))
                   (setq s 0))
                  ((floatp size)
                   (setq s (floor (* size len))))
                  ((integerp size)
                   (setq s size))
                  (t
                   (error "Illegal size: %s" size)))
            ;; Try to make sure that we are inside the safe limits.
            (cond ((zerop s))
                  ((eq type 'horizontal)
                   (setq s (max s window-min-width)))
                  ((eq type 'vertical)
                   (setq s (max s window-min-height))))
            (setcar (cdar comp-subs) s)
            (incf total s)))
        ;; Take care of the "1.0" spec.
        (if rest
            (setcar (cdr rest) (- len total))
          (error "No 1.0 specs in %s" split))
        ;; The we do the actual splitting in a nice recursive
        ;; fashion.
        (setq comp-subs (nreverse comp-subs))
        (while comp-subs
          (if (null (cdr comp-subs))
              (setq new-win window)
            (setq new-win
                  (split-window window (cadar comp-subs)
                                (eq type 'horizontal))))
          (setq result (or (gnus-configure-frame
                            (car comp-subs) window) result))
          (select-window new-win)
          (setq window new-win)
          (setq comp-subs (cdr comp-subs))))
      ;; Return the proper window, if any.
      (when result
        (select-window result))))))

(defvar gnus-frame-split-p nil)

(defun gnus-configure-windows (setting &optional force)
  (setq setting (gnus-windows-old-to-new setting))
  (let ((split (if (symbolp setting)
                   (car (cdr (assq setting gnus-buffer-configuration)))
                 setting))
        (in-buf (current-buffer))
        rule val w height hor ohor heights sub jump-buffer
        rel total to-buf all-visible)

    (setq gnus-frame-split-p nil)

    (unless split
      (error "No such setting: %s" setting))

    (if (and (not force)
             (setq all-visible (gnus-all-windows-visible-p split)))
        ;; All the windows mentioned are already visible, so we just
        ;; put point in the assigned buffer, and do not touch the
        ;; winconf.
        (select-window all-visible)

      ;; Either remove all windows or just remove all Gnus windows.
      (let ((frame (selected-frame)))
        (unwind-protect
            (if gnus-use-full-window
                ;; We want to remove all other windows.
                (if (not gnus-frame-split-p)
                    ;; This is not a `frame' split, so we ignore the
                    ;; other frames.  
                    (delete-other-windows)
                  ;; This is a `frame' split, so we delete all windows
                  ;; on all frames.
                  (mapcar 
                   (lambda (frame)
                     (unless (eq (cdr (assq 'minibuffer
                                            (frame-parameters frame)))
                                 'only)
                       (select-frame frame)
                       (delete-other-windows)))
                   (frame-list)))
              ;; Just remove some windows.
              (gnus-remove-some-windows)
              (switch-to-buffer nntp-server-buffer))
          (select-frame frame)))

      (switch-to-buffer nntp-server-buffer)
      (gnus-configure-frame split (get-buffer-window (current-buffer))))))

(defun gnus-all-windows-visible-p (split)
  (when (vectorp split)
    (setq split (append split nil)))
  (when (or (consp (car split))
            (vectorp (car split)))
    (push 1.0 split)
    (push 'vertical split))
  ;; The SPLIT might be something that is to be evaled to
  ;; return a new SPLIT.
  (while (and (not (assq (car split) gnus-window-to-buffer))
              (gnus-functionp (car split)))
    (setq split (eval split)))
  (let* ((type (elt split 0)))
    (cond
     ((null split)
      t)
     ((not (or (eq type 'horizontal) (eq type 'vertical) (eq type 'frame)))
      (let ((buffer (cond ((stringp type) type)
                          (t (cdr (assq type gnus-window-to-buffer)))))
            win buf)
        (unless buffer
          (error "Illegal buffer type: %s" type))
        (when (setq buf (get-buffer (if (symbolp buffer) (symbol-value buffer)
                                      buffer)))
          (setq win (get-buffer-window buf t)))
        (when win
          (if (memq 'point split)
              win
            t))))
     (t
      (when (eq type 'frame)
        (setq gnus-frame-split-p t))
      (let ((n (mapcar 'gnus-all-windows-visible-p
                       (cdr (cdr split))))
            (win t))
        (while n
          (cond ((windowp (car n))
                 (setq win (car n)))
                ((null (car n))
                 (setq win nil)))
          (setq n (cdr n)))
        win)))))

(defun gnus-window-top-edge (&optional window)
  (nth 1 (window-edges window)))

(defun gnus-remove-some-windows ()
  (let ((buffers gnus-window-to-buffer)
        buf bufs lowest-buf lowest)
    (save-excursion
      ;; Remove windows on all known Gnus buffers.
      (while buffers
        (setq buf (cdr (car buffers)))
        (if (symbolp buf)
            (setq buf (and (boundp buf) (symbol-value buf))))
        (and buf
             (get-buffer-window buf)
             (progn
               (setq bufs (cons buf bufs))
               (pop-to-buffer buf)
               (if (or (not lowest)
                       (< (gnus-window-top-edge) lowest))
                   (progn
                     (setq lowest (gnus-window-top-edge))
                     (setq lowest-buf buf)))))
        (setq buffers (cdr buffers)))
      ;; Remove windows on *all* summary buffers.
      (let (wins)
        (walk-windows
         (lambda (win)
           (let ((buf (window-buffer win)))
             (if (string-match  "^\\*Summary" (buffer-name buf))
                 (progn
                   (setq bufs (cons buf bufs))
                   (pop-to-buffer buf)
                   (if (or (not lowest)
                           (< (gnus-window-top-edge) lowest))
                       (progn
                         (setq lowest-buf buf)
                         (setq lowest (gnus-window-top-edge))))))))))
      (and lowest-buf
           (progn
             (pop-to-buffer lowest-buf)
             (switch-to-buffer nntp-server-buffer)))
      (while bufs
        (and (not (eq (car bufs) lowest-buf))
             (delete-windows-on (car bufs)))
        (setq bufs (cdr bufs))))))

(defun gnus-version ()
  "Version numbers of this version of Gnus."
  (interactive)
  (let ((methods gnus-valid-select-methods)
        (mess gnus-version)
        meth)
    ;; Go through all the legal select methods and add their version
    ;; numbers to the total version string.  Only the backends that are
    ;; currently in use will have their message numbers taken into
    ;; consideration.
    (while methods
      (setq meth (intern (concat (car (car methods)) "-version")))
      (and (boundp meth)
           (stringp (symbol-value meth))
           (setq mess (concat mess "; " (symbol-value meth))))
      (setq methods (cdr methods)))
    (gnus-message 2 mess)))

(defun gnus-info-find-node ()
  "Find Info documentation of Gnus."
  (interactive)
  ;; Enlarge info window if needed.
  (let ((mode major-mode)
        gnus-info-buffer)
    (Info-goto-node (car (cdr (assq mode gnus-info-nodes))))
    (setq gnus-info-buffer (current-buffer))
    (gnus-configure-windows 'info)))

(defun gnus-days-between (date1 date2)
  ;; Return the number of days between date1 and date2.
  (- (gnus-day-number date1) (gnus-day-number date2)))

(defun gnus-day-number (date)
  (let ((dat (mapcar (lambda (s) (and s (string-to-int s)) )
                     (timezone-parse-date date))))
    (timezone-absolute-from-gregorian
     (nth 1 dat) (nth 2 dat) (car dat))))

(defun gnus-encode-date (date)
  "Convert DATE to internal time."
  (let* ((parse (timezone-parse-date date))
         (date (mapcar (lambda (d) (and d (string-to-int d))) parse))
         (time (mapcar 'string-to-int (timezone-parse-time (aref parse 3)))))
    (encode-time (caddr time) (cadr time) (car time)
                 (caddr date) (cadr date) (car date) (nth 4 date))))

(defun gnus-time-minus (t1 t2)
  "Subtract two internal times."
  (let ((borrow (< (cadr t1) (cadr t2))))
    (list (- (car t1) (car t2) (if borrow 1 0))
          (- (+ (if borrow 65536 0) (cadr t1)) (cadr t2)))))

(defun gnus-file-newer-than (file date)
  (let ((fdate (nth 5 (file-attributes file))))
    (or (> (car fdate) (car date))
        (and (= (car fdate) (car date))
             (> (nth 1 fdate) (nth 1 date))))))

(defmacro gnus-define-keys (keymap &rest plist)
  "Define all keys in PLIST in KEYMAP."
  `(gnus-define-keys-1 (quote ,keymap) (quote ,plist)))

(defun gnus-define-keys-1 (keymap plist)
  (when (null keymap)
    (error "Can't set keys in a null keymap"))
  (cond ((symbolp keymap)
         (setq keymap (symbol-value keymap)))
        ((listp keymap)
         (set (car keymap) nil)
         (define-prefix-command (car keymap))
         (define-key (symbol-value (caddr keymap)) (cadr keymap) (car keymap))
         (setq keymap (symbol-value (car keymap)))))
  (let (key)
    (while plist
      (when (symbolp (setq key (pop plist)))
        (setq key (symbol-value key)))
      (define-key keymap key (pop plist)))))

(defun gnus-group-read-only-p (&optional group)
  "Check whether GROUP supports editing or not.
If GROUP is nil, `gnus-newsgroup-name' will be checked instead.  Note
that that variable is buffer-local to the summary buffers."
  (let ((group (or group gnus-newsgroup-name)))
    (not (gnus-check-backend-function 'request-replace-article group))))

(defun gnus-group-total-expirable-p (group)
  "Check whether GROUP is total-expirable or not."
  (let ((params (gnus-info-params (gnus-get-info group))))
    (or (memq 'total-expire params)
        (cdr (assq 'total-expire params)) ; (total-expire . t)
        (and gnus-total-expirable-newsgroups ; Check var.
             (string-match gnus-total-expirable-newsgroups group)))))

(defun gnus-group-auto-expirable-p (group)
  "Check whether GROUP is total-expirable or not."
  (let ((params (gnus-info-params (gnus-get-info group))))
    (or (memq 'auto-expire params)
        (cdr (assq 'auto-expire params)) ; (auto-expire . t)
        (and gnus-auto-expirable-newsgroups ; Check var.
             (string-match gnus-auto-expirable-newsgroups group)))))

(defun gnus-virtual-group-p (group)
  "Say whether GROUP is virtual or not."
  (memq 'virtual (assoc (symbol-name (car (gnus-find-method-for-group group)))
                        gnus-valid-select-methods)))

(defsubst gnus-simplify-subject-fully (subject)
  "Simplify a subject string according to the user's wishes."
  (cond
   ((null gnus-summary-gather-subject-limit)
    (gnus-simplify-subject-re subject))
   ((eq gnus-summary-gather-subject-limit 'fuzzy)
    (gnus-simplify-subject-fuzzy subject))
   ((numberp gnus-summary-gather-subject-limit)
    (gnus-limit-string (gnus-simplify-subject-re subject)
                       gnus-summary-gather-subject-limit))
   (t
    subject)))

(defsubst gnus-subject-equal (s1 s2 &optional simple-first)
  "Check whether two subjects are equal.  If optional argument
simple-first is t, first argument is already simplified."
  (cond
   ((null simple-first)
    (equal (gnus-simplify-subject-fully s1)
           (gnus-simplify-subject-fully s2)))
   (t
    (equal s1
           (gnus-simplify-subject-fully s2)))))

;; Returns a list of writable groups.
(defun gnus-writable-groups ()
  (let ((alist gnus-newsrc-alist)
        groups)
    (while alist
      (or (gnus-group-read-only-p (car (car alist)))
          (setq groups (cons (car (car alist)) groups)))
      (setq alist (cdr alist)))
    (nreverse groups)))

;; Two silly functions to ensure that all `y-or-n-p' questions clear
;; the echo area.
(defun gnus-y-or-n-p (prompt)
  (prog1
      (y-or-n-p prompt)
    (message "")))

(defun gnus-yes-or-no-p (prompt)
  (prog1
      (yes-or-no-p prompt)
    (message "")))

;; Check whether to use long file names.
(defun gnus-use-long-file-name (symbol)
  ;; The variable has to be set...
  (and gnus-use-long-file-name
       ;; If it isn't a list, then we return t.
       (or (not (listp gnus-use-long-file-name))
           ;; If it is a list, and the list contains `symbol', we
           ;; return nil.
           (not (memq symbol gnus-use-long-file-name)))))

;; I suspect there's a better way, but I haven't taken the time to do
;; it yet. -erik selberg@cs.washington.edu
(defun gnus-dd-mmm (messy-date)
  "Return a string like DD-MMM from a big messy string"
  (let ((datevec (timezone-parse-date messy-date)))
    (format "%2s-%s"
            (or (aref datevec 2) "??")
            (capitalize
             (or (car
                  (nth (1- (string-to-number (aref datevec 1)))
                       timezone-months-assoc))
                 "???")))))

;; Make a hash table (default and minimum size is 255).
;; Optional argument HASHSIZE specifies the table size.
(defun gnus-make-hashtable (&optional hashsize)
  (make-vector (if hashsize (max (gnus-create-hash-size hashsize) 255) 255) 0))

;; Make a number that is suitable for hashing; bigger than MIN and one
;; less than 2^x.
(defun gnus-create-hash-size (min)
  (let ((i 1))
    (while (< i min)
      (setq i (* 2 i)))
    (1- i)))

;; Show message if message has a lower level than `gnus-verbose'.
;; Guideline for numbers:
;; 1 - error messages, 3 - non-serious error messages, 5 - messages
;; for things that take a long time, 7 - not very important messages
;; on stuff, 9 - messages inside loops.
(defun gnus-message (level &rest args)
  (if (<= level gnus-verbose)
      (apply 'message args)
    ;; We have to do this format thingy here even if the result isn't
    ;; shown - the return value has to be the same as the return value
    ;; from `message'.
    (apply 'format args)))

(defun gnus-functionp (form)
  "Return non-nil if FORM is funcallable."
  (or (and (symbolp form) (fboundp form))
      (and (listp form) (eq (car form) 'lambda))))

;; Generate a unique new group name.
(defun gnus-generate-new-group-name (leaf)
  (let ((name leaf)
        (num 0))
    (while (gnus-gethash name gnus-newsrc-hashtb)
      (setq name (concat leaf "<" (int-to-string (setq num (1+ num))) ">")))
    name))

;; Find out whether the gnus-visual TYPE is wanted.
(defun gnus-visual-p (&optional type class)
  (and gnus-visual                      ; Has to be non-nil, at least.
       (if (not type)                   ; We don't care about type.
           gnus-visual
         (if (listp gnus-visual)        ; It's a list, so we check it.
             (or (memq type gnus-visual)
                 (memq class gnus-visual))
           t))))

(defun gnus-parent-id (references)
  "Return the last Message-ID in REFERENCES."
  (when (and references
             (string-match "\\(<[^<>]+>\\)[ \t\n]*\\'" references))
    (substring references (match-beginning 1) (match-end 1))))

(defun gnus-split-references (references)
  "Return a list of Message-IDs in REFERENCES."
  (let ((beg 0)
        ids)
    (while (string-match "<[^>]+>" references beg)
      (push (substring references (match-beginning 0) (setq beg (match-end 0)))
            ids))
    (nreverse ids)))

(defun gnus-ephemeral-group-p (group)
  "Say whether GROUP is ephemeral or not."
  (assoc 'quit-config (gnus-find-method-for-group group)))

(defun gnus-group-quit-config (group)
  "Return the quit-config of GROUP."
  (nth 1 (assoc 'quit-config (gnus-find-method-for-group group))))

(defun gnus-simplify-mode-line ()
  "Make mode lines a bit simpler."
  (setq mode-line-modified "-- ")
  (when (listp mode-line-format)
    (make-local-variable 'mode-line-format)
    (setq mode-line-format (copy-sequence mode-line-format))
    (when (equal (nth 3 mode-line-format) "   ")
      (setcar (nthcdr 3 mode-line-format) " "))))

;;; List and range functions

(defun gnus-last-element (list)
  "Return last element of LIST."
  (while (cdr list)
    (setq list (cdr list)))
  (car list))

(defun gnus-copy-sequence (list)
  "Do a complete, total copy of a list."
  (if (and (consp list) (not (consp (cdr list))))
      (cons (car list) (cdr list))
    (mapcar (lambda (elem) (if (consp elem)
                               (if (consp (cdr elem))
                                   (gnus-copy-sequence elem)
                                 (cons (car elem) (cdr elem)))
                             elem))
            list)))

(defun gnus-set-difference (list1 list2)
  "Return a list of elements of LIST1 that do not appear in LIST2."
  (let ((list1 (copy-sequence list1)))
    (while list2
      (setq list1 (delq (car list2) list1))
      (setq list2 (cdr list2)))
    list1))

(defun gnus-sorted-complement (list1 list2)
  "Return a list of elements of LIST1 that do not appear in LIST2.
Both lists have to be sorted over <."
  (let (out)
    (if (or (null list1) (null list2))
        (or list1 list2)
      (while (and list1 list2)
        (cond ((= (car list1) (car list2))
               (setq list1 (cdr list1)
                     list2 (cdr list2)))
              ((< (car list1) (car list2))
               (setq out (cons (car list1) out))
               (setq list1 (cdr list1)))
              (t
               (setq out (cons (car list2) out))
               (setq list2 (cdr list2)))))
      (nconc (nreverse out) (or list1 list2)))))

(defun gnus-intersection (list1 list2)
  (let ((result nil))
    (while list2
      (if (memq (car list2) list1)
          (setq result (cons (car list2) result)))
      (setq list2 (cdr list2)))
    result))

(defun gnus-sorted-intersection (list1 list2)
  ;; LIST1 and LIST2 have to be sorted over <.
  (let (out)
    (while (and list1 list2)
      (cond ((= (car list1) (car list2))
             (setq out (cons (car list1) out)
                   list1 (cdr list1)
                   list2 (cdr list2)))
            ((< (car list1) (car list2))
             (setq list1 (cdr list1)))
            (t
             (setq list2 (cdr list2)))))
    (nreverse out)))

(defun gnus-set-sorted-intersection (list1 list2)
  ;; LIST1 and LIST2 have to be sorted over <.
  ;; This function modifies LIST1.
  (let* ((top (cons nil list1))
         (prev top))
    (while (and list1 list2)
      (cond ((= (car list1) (car list2))
             (setq prev list1
                   list1 (cdr list1)
                   list2 (cdr list2)))
            ((< (car list1) (car list2))
             (setcdr prev (cdr list1))
             (setq list1 (cdr list1)))
            (t
             (setq list2 (cdr list2)))))
    (setcdr prev nil)
    (cdr top)))

(defun gnus-compress-sequence (numbers &optional always-list)
  "Convert list of numbers to a list of ranges or a single range.
If ALWAYS-LIST is non-nil, this function will always release a list of
ranges."
  (let* ((first (car numbers))
         (last (car numbers))
         result)
    (if (null numbers)
        nil
      (if (not (listp (cdr numbers)))
          numbers
        (while numbers
          (cond ((= last (car numbers)) nil) ;Omit duplicated number
                ((= (1+ last) (car numbers)) ;Still in sequence
                 (setq last (car numbers)))
                (t                      ;End of one sequence
                 (setq result
                       (cons (if (= first last) first
                               (cons first last)) result))
                 (setq first (car numbers))
                 (setq last  (car numbers))))
          (setq numbers (cdr numbers)))
        (if (and (not always-list) (null result))
            (if (= first last) (list first) (cons first last))
          (nreverse (cons (if (= first last) first (cons first last))
                          result)))))))

(defalias 'gnus-uncompress-sequence 'gnus-uncompress-range)
(defun gnus-uncompress-range (ranges)
  "Expand a list of ranges into a list of numbers.
RANGES is either a single range on the form `(num . num)' or a list of
these ranges."
  (let (first last result)
    (cond
     ((null ranges)
      nil)
     ((not (listp (cdr ranges)))
      (setq first (car ranges))
      (setq last (cdr ranges))
      (while (<= first last)
        (setq result (cons first result))
        (setq first (1+ first)))
      (nreverse result))
     (t
      (while ranges
        (if (atom (car ranges))
            (if (numberp (car ranges))
                (setq result (cons (car ranges) result)))
          (setq first (car (car ranges)))
          (setq last  (cdr (car ranges)))
          (while (<= first last)
            (setq result (cons first result))
            (setq first (1+ first))))
        (setq ranges (cdr ranges)))
      (nreverse result)))))

(defun gnus-add-to-range (ranges list)
  "Return a list of ranges that has all articles from both RANGES and LIST.
Note: LIST has to be sorted over `<'."
  (if (not ranges)
      (gnus-compress-sequence list t)
    (setq list (copy-sequence list))
    (or (listp (cdr ranges))
        (setq ranges (list ranges)))
    (let ((out ranges)
          ilist lowest highest temp)
      (while (and ranges list)
        (setq ilist list)
        (setq lowest (or (and (atom (car ranges)) (car ranges))
                         (car (car ranges))))
        (while (and list (cdr list) (< (car (cdr list)) lowest))
          (setq list (cdr list)))
        (if (< (car ilist) lowest)
            (progn
              (setq temp list)
              (setq list (cdr list))
              (setcdr temp nil)
              (setq out (nconc (gnus-compress-sequence ilist t) out))))
        (setq highest (or (and (atom (car ranges)) (car ranges))
                          (cdr (car ranges))))
        (while (and list (<= (car list) highest))
          (setq list (cdr list)))
        (setq ranges (cdr ranges)))
      (if list
          (setq out (nconc (gnus-compress-sequence list t) out)))
      (setq out (sort out (lambda (r1 r2)
                            (< (or (and (atom r1) r1) (car r1))
                               (or (and (atom r2) r2) (car r2))))))
      (setq ranges out)
      (while ranges
        (if (atom (car ranges))
            (if (cdr ranges)
                (if (atom (car (cdr ranges)))
                    (if (= (1+ (car ranges)) (car (cdr ranges)))
                        (progn
                          (setcar ranges (cons (car ranges)
                                               (car (cdr ranges))))
                          (setcdr ranges (cdr (cdr ranges)))))
                  (if (= (1+ (car ranges)) (car (car (cdr ranges))))
                      (progn
                        (setcar (car (cdr ranges)) (car ranges))
                        (setcar ranges (car (cdr ranges)))
                        (setcdr ranges (cdr (cdr ranges)))))))
          (if (cdr ranges)
              (if (atom (car (cdr ranges)))
                  (if (= (1+ (cdr (car ranges))) (car (cdr ranges)))
                      (progn
                        (setcdr (car ranges) (car (cdr ranges)))
                        (setcdr ranges (cdr (cdr ranges)))))
                (if (= (1+ (cdr (car ranges))) (car (car (cdr ranges))))
                    (progn
                      (setcdr (car ranges) (cdr (car (cdr ranges))))
                      (setcdr ranges (cdr (cdr ranges))))))))
        (setq ranges (cdr ranges)))
      out)))

(defun gnus-remove-from-range (ranges list)
  "Return a list of ranges that has all articles from LIST removed from RANGES.
Note: LIST has to be sorted over `<'."
  ;; !!! This function shouldn't look like this, but I've got a headache.
  (gnus-compress-sequence
   (gnus-sorted-complement
    (gnus-uncompress-range ranges) list)))

(defun gnus-member-of-range (number ranges)
  (if (not (listp (cdr ranges)))
      (and (>= number (car ranges))
           (<= number (cdr ranges)))
    (let ((not-stop t))
      (while (and ranges
                  (if (numberp (car ranges))
                      (>= number (car ranges))
                    (>= number (car (car ranges))))
                  not-stop)
        (if (if (numberp (car ranges))
                (= number (car ranges))
              (and (>= number (car (car ranges)))
                   (<= number (cdr (car ranges)))))
            (setq not-stop nil))
        (setq ranges (cdr ranges)))
      (not not-stop))))

(defun gnus-range-length (range)
  "Return the length RANGE would have if uncompressed."
  (length (gnus-uncompress-range range)))

(defun gnus-sublist-p (list sublist)
  "Test whether all elements in SUBLIST are members of LIST."
  (let ((sublistp t))
    (while sublist
      (unless (memq (pop sublist) list)
        (setq sublistp nil
              sublist nil)))
    sublistp))

\f
;;;
;;; Gnus group mode
;;;

(defvar gnus-group-mode-map nil)
(put 'gnus-group-mode 'mode-class 'special)

(unless gnus-group-mode-map
  (setq gnus-group-mode-map (make-keymap))
  (suppress-keymap gnus-group-mode-map)

  (gnus-define-keys
   gnus-group-mode-map
   " " gnus-group-read-group
   "=" gnus-group-select-group
   "\M- " gnus-group-unhidden-select-group
   "\r" gnus-group-select-group
   "\M-\r" gnus-group-quick-select-group
   "j" gnus-group-jump-to-group
   "n" gnus-group-next-unread-group
   "p" gnus-group-prev-unread-group
   "\177" gnus-group-prev-unread-group
   "N" gnus-group-next-group
   "P" gnus-group-prev-group
   "\M-n" gnus-group-next-unread-group-same-level
   "\M-p" gnus-group-prev-unread-group-same-level
   "," gnus-group-best-unread-group
   "." gnus-group-first-unread-group
   "u" gnus-group-unsubscribe-current-group
   "U" gnus-group-unsubscribe-group
   "c" gnus-group-catchup-current
   "C" gnus-group-catchup-current-all
   "l" gnus-group-list-groups
   "L" gnus-group-list-all-groups
   "m" gnus-group-mail
   "g" gnus-group-get-new-news
   "\M-g" gnus-group-get-new-news-this-group
   "R" gnus-group-restart
   "r" gnus-group-read-init-file
   "B" gnus-group-browse-foreign-server
   "b" gnus-group-check-bogus-groups
   "F" gnus-find-new-newsgroups
   "\C-c\C-d" gnus-group-describe-group
   "\M-d" gnus-group-describe-all-groups
   "\C-c\C-a" gnus-group-apropos
   "\C-c\M-\C-a" gnus-group-description-apropos
   "a" gnus-group-post-news
   "\ek" gnus-group-edit-local-kill
   "\eK" gnus-group-edit-global-kill
   "\C-k" gnus-group-kill-group
   "\C-y" gnus-group-yank-group
   "\C-w" gnus-group-kill-region
   "\C-x\C-t" gnus-group-transpose-groups
   "\C-c\C-l" gnus-group-list-killed
   "\C-c\C-x" gnus-group-expire-articles
   "\C-c\M-\C-x" gnus-group-expire-all-groups
   "V" gnus-version
   "s" gnus-group-save-newsrc
   "z" gnus-group-suspend
   "Z" gnus-group-clear-dribble
   "q" gnus-group-exit
   "Q" gnus-group-quit
   "?" gnus-group-describe-briefly
   "\C-c\C-i" gnus-info-find-node
   "\M-e" gnus-group-edit-group-method
   "^" gnus-group-enter-server-mode
   gnus-mouse-2 gnus-mouse-pick-group
   "<" beginning-of-buffer
   ">" end-of-buffer
   "\C-c\C-b" gnus-bug
   "\C-c\C-s" gnus-group-sort-groups
   "t" gnus-topic-mode
   "\C-c\M-g" gnus-activate-all-groups
   "\M-&" gnus-group-universal-argument
   "#" gnus-group-mark-group
   "\M-#" gnus-group-unmark-group)

  (gnus-define-keys
   (gnus-group-mark-map "M" gnus-group-mode-map)
   "m" gnus-group-mark-group
   "u" gnus-group-unmark-group
   "w" gnus-group-mark-region
   "m" gnus-group-mark-buffer
   "r" gnus-group-mark-regexp
   "U" gnus-group-unmark-all-groups)

  (gnus-define-keys
   (gnus-group-group-map "G" gnus-group-mode-map)
   "d" gnus-group-make-directory-group
   "h" gnus-group-make-help-group
   "a" gnus-group-make-archive-group
   "k" gnus-group-make-kiboze-group
   "m" gnus-group-make-group
   "E" gnus-group-edit-group
   "e" gnus-group-edit-group-method
   "p" gnus-group-edit-group-parameters
   "v" gnus-group-add-to-virtual
   "V" gnus-group-make-empty-virtual
   "D" gnus-group-enter-directory
   "f" gnus-group-make-doc-group
   "r" gnus-group-rename-group
   "\177" gnus-group-delete-group)

   (gnus-define-keys
    (gnus-group-soup-map "s" gnus-group-group-map)
    "b" gnus-group-brew-soup
    "w" gnus-soup-save-areas
    "s" gnus-soup-send-replies
    "p" gnus-soup-pack-packet
    "r" nnsoup-pack-replies)

   (gnus-define-keys
    (gnus-group-sort-map "S" gnus-group-group-map)
    "s" gnus-group-sort-groups
    "a" gnus-group-sort-groups-by-alphabet
    "u" gnus-group-sort-groups-by-unread
    "l" gnus-group-sort-groups-by-level
    "v" gnus-group-sort-groups-by-score
    "r" gnus-group-sort-groups-by-rank
    "m" gnus-group-sort-groups-by-method)

   (gnus-define-keys
    (gnus-group-list-map "A" gnus-group-mode-map)
    "k" gnus-group-list-killed
    "z" gnus-group-list-zombies
    "s" gnus-group-list-groups
    "u" gnus-group-list-all-groups
    "A" gnus-group-list-active
    "a" gnus-group-apropos
    "d" gnus-group-description-apropos
    "m" gnus-group-list-matching
    "M" gnus-group-list-all-matching
    "l" gnus-group-list-level)

   (gnus-define-keys
    (gnus-group-score-map "W" gnus-group-mode-map)
    "f" gnus-score-flush-cache)

   (gnus-define-keys
    (gnus-group-help-map "H" gnus-group-mode-map)
    "f" gnus-group-fetch-faq)

   (gnus-define-keys
    (gnus-group-sub-map "S" gnus-group-mode-map)
    "l" gnus-group-set-current-level
    "t" gnus-group-unsubscribe-current-group
    "s" gnus-group-unsubscribe-group
    "k" gnus-group-kill-group
    "y" gnus-group-yank-group
    "w" gnus-group-kill-region
    "\C-k" gnus-group-kill-level
    "z" gnus-group-kill-all-zombies))

(defun gnus-group-mode ()
  "Major mode for reading news.

All normal editing commands are switched off.
\\<gnus-group-mode-map>
The group buffer lists (some of) the groups available.  For instance,
`\\[gnus-group-list-groups]' will list all subscribed groups with unread articles, while `\\[gnus-group-list-zombies]'
lists all zombie groups.

Groups that are displayed can be entered with `\\[gnus-group-read-group]'.  To subscribe
to a group not displayed, type `\\[gnus-group-unsubscribe-group]'.

For more in-depth information on this mode, read the manual (`\\[gnus-info-find-node]').

The following commands are available:

\\{gnus-group-mode-map}"
  (interactive)
  (when (and menu-bar-mode
             (gnus-visual-p 'group-menu 'menu))
    (gnus-group-make-menu-bar))
  (kill-all-local-variables)
  (gnus-simplify-mode-line)
  (setq major-mode 'gnus-group-mode)
  (setq mode-name "Group")
  (gnus-group-set-mode-line)
  (setq mode-line-process nil)
  (use-local-map gnus-group-mode-map)
  (buffer-disable-undo (current-buffer))
  (setq truncate-lines t)
  (setq buffer-read-only t)
  (run-hooks 'gnus-group-mode-hook))

(defun gnus-mouse-pick-group (e)
  "Enter the group under the mouse pointer."
  (interactive "e")
  (mouse-set-point e)
  (gnus-group-read-group nil))

;; Look at LEVEL and find out what the level is really supposed to be.
;; If LEVEL is non-nil, LEVEL will be returned, if not, what happens
;; will depend on whether `gnus-group-use-permanent-levels' is used.
(defun gnus-group-default-level (&optional level number-or-nil)
  (cond
   (gnus-group-use-permanent-levels
    (setq gnus-group-default-list-level
          (or level gnus-group-default-list-level))
    (or gnus-group-default-list-level gnus-level-subscribed))
   (number-or-nil
    level)
   (t
    (or level gnus-group-default-list-level gnus-level-subscribed))))

;;;###autoload
(defun gnus-slave-no-server (&optional arg)
  "Read network news as a slave, without connecting to local server"
  (interactive "P")
  (gnus-no-server arg t))

;;;###autoload
(defun gnus-no-server (&optional arg slave)
  "Read network news.
If ARG is a positive number, Gnus will use that as the
startup level.  If ARG is nil, Gnus will be started at level 2.
If ARG is non-nil and not a positive number, Gnus will
prompt the user for the name of an NNTP server to use.
As opposed to `gnus', this command will not connect to the local server."
  (interactive "P")
  (make-local-variable 'gnus-group-use-permanent-levels)
  (setq gnus-group-use-permanent-levels t)
  (gnus (or arg (1- gnus-level-default-subscribed)) t slave))

;;;###autoload
(defun gnus-slave (&optional arg)
  "Read news as a slave."
  (interactive "P")
  (gnus arg nil 'slave))

;;;###autoload
(defun gnus-other-frame (&optional arg)
  "Pop up a frame to read news."
  (interactive "P")
  (if (get-buffer gnus-group-buffer)
      (let ((pop-up-frames t))
        (gnus arg))
    (select-frame (make-frame))
    (gnus arg)))

;;;###autoload
(defun gnus (&optional arg dont-connect slave)
  "Read network news.
If ARG is non-nil and a positive number, Gnus will use that as the
startup level.  If ARG is non-nil and not a positive number, Gnus will
prompt the user for the name of an NNTP server to use."
  (interactive "P")

  (if (get-buffer gnus-group-buffer)
      (progn
        (switch-to-buffer gnus-group-buffer)
        (gnus-group-get-new-news))

    (gnus-clear-system)
    (nnheader-init-server-buffer)
    (gnus-read-init-file)
    (setq gnus-slave slave)

    (gnus-group-setup-buffer)
    (let ((buffer-read-only nil))
      (erase-buffer)
      (if (not gnus-inhibit-startup-message)
          (progn
            (gnus-group-startup-message)
            (sit-for 0))))

    (let ((level (and (numberp arg) (> arg 0) arg))
          did-connect)
      (unwind-protect
          (progn
            (or dont-connect
                (setq did-connect
                      (gnus-start-news-server (and arg (not level))))))
        (if (and (not dont-connect)
                 (not did-connect))
            (gnus-group-quit)
          (run-hooks 'gnus-startup-hook)
          ;; NNTP server is successfully open.

          ;; Find the current startup file name.
          (setq gnus-current-startup-file
                (gnus-make-newsrc-file gnus-startup-file))

          ;; Read the dribble file.
          (and (or gnus-slave gnus-use-dribble-file) (gnus-dribble-read-file))

          (gnus-summary-make-display-table)
          ;; Do the actual startup.
          (gnus-setup-news nil level)
          ;; Generate the group buffer.
          (gnus-group-list-groups level)
          (gnus-group-first-unread-group)
          (gnus-configure-windows 'group)
          (gnus-group-set-mode-line))))))

(defun gnus-unload ()
  "Unload all Gnus features."
  (interactive)
  (or (boundp 'load-history)
      (error "Sorry, `gnus-unload' is not implemented in this Emacs version."))
  (let ((history load-history)
        feature)
    (while history
      (and (string-match "^\\(gnus\\|nn\\)" (caar history))
           (setq feature (cdr (assq 'provide (car history))))
           (unload-feature feature 'force))
      (setq history (cdr history)))))

(defun gnus-compile ()
  "Byte-compile the user-defined format specs."
  (interactive)
  (let ((entries gnus-format-specs)
        entry gnus-tmp-func)
    (save-excursion
      (gnus-message 7 "Compiling format specs...")

      (while entries
        (setq entry (pop entries))
        (if (eq (car entry) 'version)
            (setq gnus-format-specs (delq entry gnus-format-specs))
          (when (and (listp (caddr entry))
                     (not (eq 'byte-code (caaddr entry))))
            (fset 'gnus-tmp-func
                  `(lambda () ,(caddr entry)))
            (byte-compile 'gnus-tmp-func)
            (setcar (cddr entry) (gnus-byte-code 'gnus-tmp-func)))))

      (push (cons 'version emacs-version) gnus-format-specs)

      (gnus-message 7 "Compiling user specs...done"))))

(defun gnus-indent-rigidly (start end arg)
  "Indent rigidly using only spaces and no tabs."
  (save-excursion
    (save-restriction
      (narrow-to-region start end)
      (indent-rigidly start end arg)
      (goto-char (point-min))
      (while (search-forward "\t" nil t)
        (replace-match "        " t t)))))

(defun gnus-group-startup-message (&optional x y)
  "Insert startup message in current buffer."
  ;; Insert the message.
  (erase-buffer)
  (insert
   (format "              %s
          _    ___ _             _
          _ ___ __ ___  __    _ ___
          __   _     ___    __  ___
              _           ___     _
             _  _ __             _
             ___   __            _
                   __           _
                    _      _   _
                   _      _    _
                      _  _    _
                  __  ___
                 _   _ _     _
                _   _
              _    _
             _    _
            _
          __

"
           ""))
  ;; And then hack it.
  (gnus-indent-rigidly (point-min) (point-max)
                       (/ (max (- (window-width) (or x 46)) 0) 2))
  (goto-char (point-min))
  (forward-line 1)
  (let* ((pheight (count-lines (point-min) (point-max)))
         (wheight (window-height))
         (rest (- wheight pheight)))
    (insert (make-string (max 0 (* 2 (/ rest 3))) ?\n)))
  ;; Fontify some.
  (goto-char (point-min))
  (and (search-forward "Praxis" nil t)
       (put-text-property (match-beginning 0) (match-end 0) 'face 'bold))
  (goto-char (point-min))
  (let* ((mode-string (gnus-group-set-mode-line)))
    (setq mode-line-buffer-identification
          (list (concat gnus-version (substring (car mode-string) 4))))
    (set-buffer-modified-p t)))

(defun gnus-group-setup-buffer ()
  (or (get-buffer gnus-group-buffer)
      (progn
        (switch-to-buffer gnus-group-buffer)
        (gnus-add-current-to-buffer-list)
        (gnus-group-mode)
        (and gnus-carpal (gnus-carpal-setup-buffer 'group)))))

(defun gnus-group-list-groups (&optional level unread lowest)
  "List newsgroups with level LEVEL or lower that have unread articles.
Default is all subscribed groups.
If argument UNREAD is non-nil, groups with no unread articles are also
listed."
  (interactive (list (if current-prefix-arg
                         (prefix-numeric-value current-prefix-arg)
                       (or
                        (gnus-group-default-level nil t)
                        gnus-group-default-list-level
                        gnus-level-subscribed))))
  (or level
      (setq level (car gnus-group-list-mode)
            unread (cdr gnus-group-list-mode)))
  (setq level (gnus-group-default-level level))
  (gnus-group-setup-buffer)             ;May call from out of group buffer
  (gnus-update-format-specifications)
  (let ((case-fold-search nil)
        (props (text-properties-at (gnus-point-at-bol)))
        (group (gnus-group-group-name)))
    (funcall gnus-group-prepare-function level unread lowest)
    (if (zerop (buffer-size))
        (gnus-message 5 gnus-no-groups-message)
      (goto-char (point-max))
      (when (or (not gnus-group-goto-next-group-function)
                (not (funcall gnus-group-goto-next-group-function 
                              group props)))
        (if (not group)
            ;; Go to the first group with unread articles.
            (gnus-group-search-forward t)
          ;; Find the right group to put point on.  If the current group
          ;; has disappeared in the new listing, try to find the next
          ;; one.        If no next one can be found, just leave point at the
          ;; first newsgroup in the buffer.
          (if (not (gnus-goto-char
                    (text-property-any
                     (point-min) (point-max)
                     'gnus-group (gnus-intern-safe group gnus-active-hashtb))))
              (let ((newsrc (cdddr (gnus-gethash group gnus-newsrc-hashtb))))
                (while (and newsrc
                            (not (gnus-goto-char
                                  (text-property-any
                                   (point-min) (point-max) 'gnus-group
                                   (gnus-intern-safe
                                    (car (car newsrc)) gnus-active-hashtb)))))
                  (setq newsrc (cdr newsrc)))
                (or newsrc (progn (goto-char (point-max))
                                  (forward-line -1)))))))
      ;; Adjust cursor point.
      (gnus-group-position-point))))

(defun gnus-group-list-level (level &optional all)
  "List groups on LEVEL.
If ALL (the prefix), also list groups that have no unread articles."
  (interactive "nList groups on level: \nP")
  (gnus-group-list-groups level all level))

(defun gnus-group-prepare-flat (level &optional all lowest regexp)
  "List all newsgroups with unread articles of level LEVEL or lower.
If ALL is non-nil, list groups that have no unread articles.
If LOWEST is non-nil, list all newsgroups of level LOWEST or higher.
If REGEXP, only list groups matching REGEXP."
  (set-buffer gnus-group-buffer)
  (let ((buffer-read-only nil)
        (newsrc (cdr gnus-newsrc-alist))
        (lowest (or lowest 1))
        info clevel unread group params)
    (erase-buffer)
    (if (< lowest gnus-level-zombie)
        ;; List living groups.
        (while newsrc
          (setq info (car newsrc)
                group (gnus-info-group info)
                params (gnus-info-params info)
                newsrc (cdr newsrc)
                unread (car (gnus-gethash group gnus-newsrc-hashtb)))
          (and unread                   ; This group might be bogus
               (or (not regexp)
                   (string-match regexp group))
               (<= (setq clevel (gnus-info-level info)) level)
               (>= clevel lowest)
               (or all                  ; We list all groups?
                   (and gnus-group-list-inactive-groups
                        (eq unread t))  ; We list unactivated groups
                   (> unread 0)         ; We list groups with unread articles
                   (and gnus-list-groups-with-ticked-articles
                        (cdr (assq 'tick (gnus-info-marks info))))
                                        ; And groups with tickeds
                   ;; Check for permanent visibility.
                   (and gnus-permanently-visible-groups
                        (string-match gnus-permanently-visible-groups
                                      group))
                   (memq 'visible params)
                   (cdr (assq 'visible params)))
               (gnus-group-insert-group-line
                group (gnus-info-level info)
                (gnus-info-marks info) unread (gnus-info-method info)))))

    ;; List dead groups.
    (and (>= level gnus-level-zombie) (<= lowest gnus-level-zombie)
         (gnus-group-prepare-flat-list-dead
          (setq gnus-zombie-list (sort gnus-zombie-list 'string<))
          gnus-level-zombie ?Z
          regexp))
    (and (>= level gnus-level-killed) (<= lowest gnus-level-killed)
         (gnus-group-prepare-flat-list-dead
          (setq gnus-killed-list (sort gnus-killed-list 'string<))
          gnus-level-killed ?K regexp))

    (gnus-group-set-mode-line)
    (setq gnus-group-list-mode (cons level all))
    (run-hooks 'gnus-group-prepare-hook)))

(defun gnus-group-prepare-flat-list-dead (groups level mark regexp)
  ;; List zombies and killed lists somewhat faster, which was
  ;; suggested by Jack Vinson <vinson@unagi.cis.upenn.edu>.  It does
  ;; this by ignoring the group format specification altogether.
  (let (group beg)
    (if regexp
        ;; This loop is used when listing groups that match some
        ;; regexp.
        (while groups
          (setq group (pop groups))
          (when (string-match regexp group)
            (add-text-properties
             (point) (prog1 (1+ (point))
                       (insert " " mark "     *: " group "\n"))
             (list 'gnus-group (gnus-intern-safe group gnus-active-hashtb)
                   'gnus-unread t
                   'gnus-level level))))
      ;; This loop is used when listing all groups.
      (while groups
        (add-text-properties
         (point) (prog1 (1+ (point))
                   (insert " " mark "     *: "
                           (setq group (pop groups)) "\n"))
         (list 'gnus-group (gnus-intern-safe group gnus-active-hashtb)
               'gnus-unread t
               'gnus-level level))))))

(defmacro gnus-group-real-name (group)
  "Find the real name of a foreign newsgroup."
  `(let ((gname ,group))
     (if (string-match ":[^:]+$" gname)
         (substring gname (1+ (match-beginning 0)))
       gname)))

(defsubst gnus-server-add-address (method)
  (let ((method-name (symbol-name (car method))))
    (if (and (memq 'address (assoc method-name gnus-valid-select-methods))
             (not (assq (intern (concat method-name "-address")) method)))
        (append method (list (list (intern (concat method-name "-address"))
                                   (nth 1 method))))
      method)))

(defsubst gnus-server-get-method (group method)
  ;; Input either a server name, and extended server name, or a
  ;; select method, and return a select method.
  (cond ((stringp method)
         (gnus-server-to-method method))
        ((and (stringp (car method)) group)
         (gnus-server-extend-method group method))
        (t
         (gnus-server-add-address method))))

(defun gnus-server-to-method (server)
  "Map virtual server names to select methods."
  (or (and (equal server "native") gnus-select-method)
      (cdr (assoc server gnus-server-alist))))

(defmacro gnus-server-equal (ss1 ss2)
  "Say whether two servers are equal."
  `(let ((s1 ,ss1)
         (s2 ,ss2))
     (or (equal s1 s2)
         (and (= (length s1) (length s2))
              (progn
                (while (and s1 (member (car s1) s2))
                  (setq s1 (cdr s1)))
                (null s1))))))

(defun gnus-group-prefixed-name (group method)
  "Return the whole name from GROUP and METHOD."
  (and (stringp method) (setq method (gnus-server-to-method method)))
  (concat (format "%s" (car method))
          (if (and
               (assoc (format "%s" (car method)) (gnus-methods-using 'address))
               (not (string= (nth 1 method) "")))
              (concat "+" (nth 1 method)))
          ":" group))

(defun gnus-group-real-prefix (group)
  "Return the prefix of the current group name."
  (if (string-match "^[^:]+:" group)
      (substring group 0 (match-end 0))
    ""))

(defun gnus-group-method-name (group)
  "Return the method used for selecting GROUP."
  (let ((prefix (gnus-group-real-prefix group)))
    (if (equal prefix "")
        gnus-select-method
      (if (string-match "^[^\\+]+\\+" prefix)
          (list (intern (substring prefix 0 (1- (match-end 0))))
                (substring prefix (match-end 0) (1- (length prefix))))
        (list (intern (substring prefix 0 (1- (length prefix)))) "")))))

(defsubst gnus-secondary-method-p (method)
  "Return whether METHOD is a secondary select method."
  (let ((methods gnus-secondary-select-methods)
        (gmethod (gnus-server-get-method nil method)))
    (while (and methods
                (not (equal (gnus-server-get-method nil (car methods))
                            gmethod)))
      (setq methods (cdr methods)))
    methods))

(defun gnus-group-foreign-p (group)
  "Say whether a group is foreign or not."
  (and (not (gnus-group-native-p group))
       (not (gnus-group-secondary-p group))))

(defun gnus-group-native-p (group)
  "Say whether the group is native or not."
  (not (string-match ":" group)))

(defun gnus-group-secondary-p (group)
  "Say whether the group is secondary or not."
  (gnus-secondary-method-p (gnus-find-method-for-group group)))

(defun gnus-group-get-parameter (group &optional symbol)
  "Returns the group parameters for GROUP.
If SYMBOL, return the value of that symbol in the group parameters."
  (let ((params (gnus-info-params (gnus-get-info group))))
    (if symbol
        (gnus-group-parameter-value params symbol)
      params)))

(defun gnus-group-parameter-value (params symbol)
  "Return the value of SYMBOL in group PARAMS."
  (or (car (memq symbol params))        ; It's either a simple symbol
      (cdr (assq symbol params))))      ; or a cons.

(defun gnus-group-add-parameter (group param)
  "Add parameter PARAM to GROUP."
  (let ((info (gnus-get-info group)))
    (if (not info)
        () ; This is a dead group.  We just ignore it.
      ;; Cons the new param to the old one and update.
      (gnus-group-set-info (cons param (gnus-info-params info))
                           group 'params))))

(defun gnus-group-add-score (group &optional score)
  "Add SCORE to the GROUP score.
If SCORE is nil, add 1 to the score of GROUP."
  (let ((info (gnus-get-info group)))
    (gnus-info-set-score info (+ (gnus-info-score info) (or score 1)))))

(defun gnus-summary-bubble-group ()
  "Increase the score of the current group.
This is a handy function to add to `gnus-summary-exit-hook' to
increase the score of each group you read."
  (gnus-group-add-score gnus-newsgroup-name))

(defun gnus-group-set-info (info &optional method-only-group part)
  (let* ((entry (gnus-gethash
                 (or method-only-group (gnus-info-group info))
                 gnus-newsrc-hashtb))
         (part-info info)
         (info (if method-only-group (nth 2 entry) info)))
    (when method-only-group
      (unless entry
        (error "Trying to change non-existent group %s" method-only-group))
      ;; We have received parts of the actual group info - either the
      ;; select method or the group parameters.  We first check
      ;; whether we have to extend the info, and if so, do that.
      (let ((len (length info))
            (total (if (eq part 'method) 5 6)))
        (when (< len total)
          (setcdr (nthcdr (1- len) info)
                  (make-list (- total len) nil)))
        ;; Then we enter the new info.
        (setcar (nthcdr (1- total) info) part-info)))
    (unless entry
      ;; This is a new group, so we just create it.
      (save-excursion
        (set-buffer gnus-group-buffer)
        (if (gnus-info-method info)
            ;; It's a foreign group...
            (gnus-group-make-group
             (gnus-group-real-name (gnus-info-group info))
             (prin1-to-string (car (gnus-info-method info)))
             (nth 1 (gnus-info-method info)))
          ;; It's a native group.
          (gnus-group-make-group (gnus-info-group info)))
        (gnus-message 6 "Note: New group created")
        (setq entry
              (gnus-gethash (gnus-group-prefixed-name
                             (gnus-group-real-name (gnus-info-group info))
                             (or (gnus-info-method info) gnus-select-method))
                            gnus-newsrc-hashtb))))
    ;; Whether it was a new group or not, we now have the entry, so we
    ;; can do the update.
    (if entry
        (progn
          (setcar (nthcdr 2 entry) info)
          (when (and (not (eq (car entry) t))
                     (gnus-active (gnus-info-group info)))
            (let ((marked (gnus-info-marks info)))
              (setcar entry (length (gnus-list-of-unread-articles
                                     (car info)))))))
      (error "No such group: %s" (gnus-info-group info)))))

(defun gnus-group-set-method-info (group select-method)
  (gnus-group-set-info select-method group 'method))

(defun gnus-group-set-params-info (group params)
  (gnus-group-set-info params group 'params))

(defun gnus-group-update-group-line ()
  "Update the current line in the group buffer."
  (let* ((buffer-read-only nil)
         (group (gnus-group-group-name))
         (gnus-group-indentation (gnus-group-group-indentation))
         (entry (and group (gnus-gethash group gnus-newsrc-hashtb))))
    (and entry
         (not (gnus-ephemeral-group-p group))
         (gnus-dribble-enter
          (concat "(gnus-group-set-info '"
                  (prin1-to-string (nth 2 entry)) ")")))
    (gnus-delete-line)
    (gnus-group-insert-group-line-info group)
    (forward-line -1)
    (gnus-group-position-point)))

(defun gnus-group-insert-group-line-info (group)
  "Insert GROUP on the current line."
  (let ((entry (gnus-gethash group gnus-newsrc-hashtb))
        active info)
    (if entry
        (progn
          ;; (Un)subscribed group.
          (setq info (nth 2 entry))
          (gnus-group-insert-group-line
           group (gnus-info-level info) (gnus-info-marks info)
           (or (car entry) t) (gnus-info-method info)))
      ;; This group is dead.
      (gnus-group-insert-group-line
       group
       (if (member group gnus-zombie-list) gnus-level-zombie gnus-level-killed)
       nil
       (if (setq active (gnus-active group))
           (- (1+ (cdr active)) (car active)) 0)
       nil))))

(defun gnus-group-insert-group-line
  (gnus-tmp-group gnus-tmp-level gnus-tmp-marked number
                  gnus-tmp-method)
  "Insert a group line in the group buffer."
  (let* ((gnus-tmp-active (gnus-active gnus-tmp-group))
         (gnus-tmp-number-total
          (if gnus-tmp-active
              (1+ (- (cdr gnus-tmp-active) (car gnus-tmp-active)))
            0))
         (gnus-tmp-number-of-unread
          (if (numberp number) (int-to-string (max 0 number))
            "*"))
         (gnus-tmp-number-of-read
          (if (numberp number)
              (int-to-string (max 0 (- gnus-tmp-number-total number)))
            "*"))
         (gnus-tmp-subscribed
          (cond ((<= gnus-tmp-level gnus-level-subscribed) ? )
                ((<= gnus-tmp-level gnus-level-unsubscribed) ?U)
                ((= gnus-tmp-level gnus-level-zombie) ?Z)
                (t ?K)))
         (gnus-tmp-qualified-group (gnus-group-real-name gnus-tmp-group))
         (gnus-tmp-newsgroup-description
          (if gnus-description-hashtb
              (or (gnus-gethash gnus-tmp-group gnus-description-hashtb) "")
            ""))
         (gnus-tmp-moderated
          (if (member gnus-tmp-group gnus-moderated-list) ?m ? ))
         (gnus-tmp-moderated-string
          (if (eq gnus-tmp-moderated ?m) "(m)" ""))
         (gnus-tmp-method
          (gnus-server-get-method gnus-tmp-group gnus-tmp-method))
         (gnus-tmp-news-server (or (car (cdr gnus-tmp-method)) ""))
         (gnus-tmp-news-method (or (car gnus-tmp-method) ""))
         (gnus-tmp-news-method-string
          (if gnus-tmp-method
              (format "(%s:%s)" (car gnus-tmp-method)
                      (car (cdr gnus-tmp-method))) ""))
         (gnus-tmp-marked-mark
          (if (and (numberp number)
                   (zerop number)
                   (cdr (assq 'tick gnus-tmp-marked)))
              ?* ? ))
         (gnus-tmp-process-marked
          (if (member gnus-tmp-group gnus-group-marked)
              gnus-process-mark ? ))
         (buffer-read-only nil)
         header gnus-tmp-header)                        ; passed as parameter to user-funcs.
    (beginning-of-line)
    (add-text-properties
     (point)
     (prog1 (1+ (point))
       ;; Insert the text.
       (eval gnus-group-line-format-spec))
     `(gnus-group ,(gnus-intern-safe gnus-tmp-group gnus-active-hashtb)
       gnus-unread ,(if (numberp number)
                        (string-to-int gnus-tmp-number-of-unread)
                      t)
       gnus-marked ,gnus-tmp-marked-mark
       gnus-indentation ,gnus-group-indentation
       gnus-level ,gnus-tmp-level))
    (when (gnus-visual-p 'group-highlight 'highlight)
      (forward-line -1)
      (run-hooks 'gnus-group-update-hook)
      (forward-line))
    ;; Allow XEmacs to remove front-sticky text properties.
    (gnus-group-remove-excess-properties)))

(defun gnus-group-update-group (group &optional visible-only)
  "Update all lines where GROUP appear.
If VISIBLE-ONLY is non-nil, the group won't be displayed if it isn't
already."
  (save-excursion
    (set-buffer gnus-group-buffer)
    ;; The buffer may be narrowed.
    (save-restriction
      (widen)
      (let ((ident (gnus-intern-safe group gnus-active-hashtb))
            (loc (point-min))
            found buffer-read-only visible)
        ;; Enter the current status into the dribble buffer.
        (let ((entry (gnus-gethash group gnus-newsrc-hashtb)))
          (if (and entry (not (gnus-ephemeral-group-p group)))
              (gnus-dribble-enter
               (concat "(gnus-group-set-info '" (prin1-to-string (nth 2 entry))
                       ")"))))
        ;; Find all group instances.  If topics are in use, each group
        ;; may be listed in more than once.
        (while (setq loc (text-property-any
                          loc (point-max) 'gnus-group ident))
          (setq found t)
          (goto-char loc)
          (let ((gnus-group-indentation (gnus-group-group-indentation)))
            (gnus-delete-line)
            (gnus-group-insert-group-line-info group))
          (setq loc (1+ loc)))
        (unless (or found visible-only)
          ;; No such line in the buffer, find out where it's supposed to
          ;; go, and insert it there (or at the end of the buffer).
          (if gnus-goto-missing-group-function
              (funcall gnus-goto-missing-group-function group)
            (let ((entry (cdr (cdr (gnus-gethash group gnus-newsrc-hashtb)))))
              (while (and entry (car entry)
                          (not
                           (gnus-goto-char
                            (text-property-any
                             (point-min) (point-max)
                             'gnus-group (gnus-intern-safe
                                          (car (car entry))
                                          gnus-active-hashtb)))))
                (setq entry (cdr entry)))
              (or entry (goto-char (point-max)))))
          ;; Finally insert the line.
          (let ((gnus-group-indentation (gnus-group-group-indentation)))
            (gnus-group-insert-group-line-info group)))
        (gnus-group-set-mode-line)))))

(defun gnus-group-set-mode-line ()
  (when (memq 'group gnus-updated-mode-lines)
    (let* ((gformat (or gnus-group-mode-line-format-spec
                        (setq gnus-group-mode-line-format-spec
                              (gnus-parse-format
                               gnus-group-mode-line-format
                               gnus-group-mode-line-format-alist))))
           (gnus-tmp-news-server (car (cdr gnus-select-method)))
           (gnus-tmp-news-method (car gnus-select-method))
           (max-len 60)
           gnus-tmp-header                      ;Dummy binding for user-defined formats
           ;; Get the resulting string.
           (mode-string (eval gformat)))
      ;; If the line is too long, we chop it off.
      (when (> (length mode-string) max-len)
        (setq mode-string (substring mode-string 0 (- max-len 4))))
      (prog1
          (setq mode-line-buffer-identification (list mode-string))
        (set-buffer-modified-p t)))))

(defun gnus-group-group-name ()
  "Get the name of the newsgroup on the current line."
  (let ((group (get-text-property (gnus-point-at-bol) 'gnus-group)))
    (and group (symbol-name group))))

(defun gnus-group-group-level ()
  "Get the level of the newsgroup on the current line."
  (get-text-property (gnus-point-at-bol) 'gnus-level))

(defun gnus-group-group-indentation ()
  "Get the indentation of the newsgroup on the current line."
  (or (get-text-property (gnus-point-at-bol) 'gnus-indentation) ""))

(defun gnus-group-group-unread ()
  "Get the number of unread articles of the newsgroup on the current line."
  (get-text-property (gnus-point-at-bol) 'gnus-unread))

(defun gnus-group-search-forward (&optional backward all level first-too)
  "Find the next newsgroup with unread articles.
If BACKWARD is non-nil, find the previous newsgroup instead.
If ALL is non-nil, just find any newsgroup.
If LEVEL is non-nil, find group with level LEVEL, or higher if no such
group exists.
If FIRST-TOO, the current line is also eligible as a target."
  (let ((way (if backward -1 1))
        (low gnus-level-killed)
        (beg (point))
        pos found lev)
    (if (and backward (progn (beginning-of-line)) (bobp))
        nil
      (or first-too (forward-line way))
      (while (and
              (not (eobp))
              (not (setq
                    found
                    (and (or all
                             (and
                              (let ((unread
                                     (get-text-property (point) 'gnus-unread)))
                                (and (numberp unread) (> unread 0)))
                              (setq lev (get-text-property (point)
                                                           'gnus-level))
                              (<= lev gnus-level-subscribed)))
                         (or (not level)
                             (and (setq lev (get-text-property (point)
                                                               'gnus-level))
                                  (or (= lev level)
                                      (and (< lev low)
                                           (< level lev)
                                           (progn
                                             (setq low lev)
                                             (setq pos (point))
                                             nil))))))))
              (zerop (forward-line way)))))
    (if found
        (progn (gnus-group-position-point) t)
      (goto-char (or pos beg))
      (and pos t))))

;;; Gnus group mode commands

;; Group marking.

(defun gnus-group-mark-group (n &optional unmark no-advance)
  "Mark the current group."
  (interactive "p")
  (let ((buffer-read-only nil)
        group)
    (while
        (and (> n 0)
             (setq group (gnus-group-group-name))
             (progn
               (beginning-of-line)
               (forward-char
                (or (cdr (assq 'process gnus-group-mark-positions)) 2))
               (delete-char 1)
               (if unmark
                   (progn
                     (insert " ")
                     (setq gnus-group-marked (delete group gnus-group-marked)))
                 (insert "#")
                 (setq gnus-group-marked
                       (cons group (delete group gnus-group-marked))))
               t)
             (or no-advance (zerop (gnus-group-next-group 1))))
      (setq n (1- n)))
    (gnus-summary-position-point)
    n))

(defun gnus-group-unmark-group (n)
  "Remove the mark from the current group."
  (interactive "p")
  (gnus-group-mark-group n 'unmark)
  (gnus-group-position-point))

(defun gnus-group-unmark-all-groups ()
  "Unmark all groups."
  (let ((groups gnus-group-marked))
    (save-excursion
      (while groups
        (gnus-group-remove-mark (pop groups)))))
  (gnus-group-position-point))

(defun gnus-group-mark-region (unmark beg end)
  "Mark all groups between point and mark.
If UNMARK, remove the mark instead."
  (interactive "P\nr")
  (let ((num (count-lines beg end)))
    (save-excursion
      (goto-char beg)
      (- num (gnus-group-mark-group num unmark)))))

(defun gnus-group-mark-buffer (&optional unmark)
  "Mark all groups in the buffer.
If UNMARK, remove the mark instead."
  (interactive "P")
  (gnus-group-mark-region unmark (point-min) (point-max)))

(defun gnus-group-mark-regexp (regexp)
  "Mark all groups that match some regexp."
  (interactive "sMark (regexp): ")
  (let ((alist (cdr gnus-newsrc-alist))
        group)
    (while alist
      (when (string-match regexp (setq group (gnus-info-group (pop alist))))
        (gnus-group-set-mark group))))
  (gnus-group-position-point))

(defun gnus-group-remove-mark (group)
  "Remove the process mark from GROUP and move point there.
Return nil if the group isn't displayed."
  (if (gnus-group-goto-group group)
      (save-excursion
        (gnus-group-mark-group 1 'unmark t)
        t)
    (setq gnus-group-marked
          (delete group gnus-group-marked))
    nil))

(defun gnus-group-set-mark (group)
  "Set the process mark on GROUP."
  (if (gnus-group-goto-group group)
      (save-excursion
        (gnus-group-mark-group 1 nil t))
    (setq gnus-group-marked
          (cons group (delete group gnus-group-marked)))))

(defun gnus-group-universal-argument (arg &optional groups func)
  "Perform any command on all groups accoring to the process/prefix convention."
  (interactive "P")
  (let ((groups (or groups (gnus-group-process-prefix arg)))
        group func)
    (if (eq (setq func (or func
                           (key-binding
                            (read-key-sequence
                             (substitute-command-keys
                              "\\<gnus-group-mode-map>\\[gnus-group-universal-argument]")))))
            'undefined)
        (progn
          (message "Undefined key")
          (ding))
      (while groups
        (gnus-group-remove-mark (setq group (pop groups)))
        (command-execute func))))
  (gnus-group-position-point))

(defun gnus-group-process-prefix (n)
  "Return a list of groups to work on.
Take into consideration N (the prefix) and the list of marked groups."
  (cond
   (n
    (setq n (prefix-numeric-value n))
    ;; There is a prefix, so we return a list of the N next
    ;; groups.
    (let ((way (if (< n 0) -1 1))
          (n (abs n))
          group groups)
      (save-excursion
        (while (and (> n 0)
                    (setq group (gnus-group-group-name)))
          (setq groups (cons group groups))
          (setq n (1- n))
          (gnus-group-next-group way)))
      (nreverse groups)))
   ((and (boundp 'transient-mark-mode)
         transient-mark-mode
         mark-active)
    ;; Work on the region between point and mark.
    (let ((max (max (point) (mark)))
          groups)
      (save-excursion
        (goto-char (min (point) (mark)))
        (while
            (and
             (push (gnus-group-group-name) groups)
             (zerop (gnus-group-next-group 1))
             (< (point) max)))
        (nreverse groups))))
   (gnus-group-marked
    ;; No prefix, but a list of marked articles.
    (reverse gnus-group-marked))
   (t
    ;; Neither marked articles or a prefix, so we return the
    ;; current group.
    (let ((group (gnus-group-group-name)))