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;;; gnus-score.el --- scoring code for Gnus
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;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
;;   2004, 2005 Free Software Foundation, Inc.
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;; Author: Per Abrahamsen <amanda@iesd.auc.dk>
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;;	Lars Magne Ingebrigtsen <larsi@gnus.org>
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;; Keywords: news

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; 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
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
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;;; Commentary:

;;; Code:

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

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(require 'gnus)
(require 'gnus-sum)
(require 'gnus-range)
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(require 'gnus-win)
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(require 'message)
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(require 'score-mode)
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(autoload 'ffap-string-at-point "ffap")

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(defcustom gnus-global-score-files nil
  "List of global score files and directories.
Set this variable if you want to use people's score files.  One entry
for each score file or each score file directory.  Gnus will decide
by itself what score files are applicable to which group.

Say you want to use the single score file
\"/ftp.gnus.org@ftp:/pub/larsi/ding/score/soc.motss.SCORE\" and all
score files in the \"/ftp.some-where:/pub/score\" directory.

 (setq gnus-global-score-files
       '(\"/ftp.gnus.org:/pub/larsi/ding/score/soc.motss.SCORE\"
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	 \"/ftp.some-where:/pub/score\"))"
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  :group 'gnus-score-files
  :type '(repeat file))

(defcustom gnus-score-file-single-match-alist nil
  "Alist mapping regexps to lists of score files.
Each element of this alist should be of the form
	(\"REGEXP\" [ \"SCORE-FILE-1\" ] [ \"SCORE-FILE-2\" ] ... )

If the name of a group is matched by REGEXP, the corresponding scorefiles
will be used for that group.
The first match found is used, subsequent matching entries are ignored (to
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use multiple matches, see `gnus-score-file-multiple-match-alist').
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These score files are loaded in addition to any files returned by
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`gnus-score-find-score-files-function'."
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  :group 'gnus-score-files
  :type '(repeat (cons regexp (repeat file))))

(defcustom gnus-score-file-multiple-match-alist nil
  "Alist mapping regexps to lists of score files.
Each element of this alist should be of the form
	(\"REGEXP\" [ \"SCORE-FILE-1\" ] [ \"SCORE-FILE-2\" ] ... )

If the name of a group is matched by REGEXP, the corresponding scorefiles
will be used for that group.
If multiple REGEXPs match a group, the score files corresponding to each
match will be used (for only one match to be used, see
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`gnus-score-file-single-match-alist').
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These score files are loaded in addition to any files returned by
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`gnus-score-find-score-files-function'."
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  :group 'gnus-score-files
  :type '(repeat (cons regexp (repeat file))))

(defcustom gnus-score-file-suffix "SCORE"
  "Suffix of the score files."
  :group 'gnus-score-files
  :type 'string)

(defcustom gnus-adaptive-file-suffix "ADAPT"
  "Suffix of the adaptive score files."
  :group 'gnus-score-files
  :group 'gnus-score-adapt
  :type 'string)

(defcustom gnus-score-find-score-files-function 'gnus-score-find-bnews
  "Function used to find score files.
The function will be called with the group name as the argument, and
should return a list of score files to apply to that group.  The score
files do not actually have to exist.

Predefined values are:

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`gnus-score-find-single': Only apply the group's own score file.
`gnus-score-find-hierarchical': Also apply score files from parent groups.
`gnus-score-find-bnews': Apply score files whose names matches.
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See the documentation to these functions for more information.

This variable can also be a list of functions to be called.  Each
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function is given the group name as argument and should either return
a list of score files, or a list of score alists.
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If functions other than these pre-defined functions are used,
the `a' symbolic prefix to the score commands will always use
\"all.SCORE\"."
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  :group 'gnus-score-files
  :type '(radio (function-item gnus-score-find-single)
		(function-item gnus-score-find-hierarchical)
		(function-item gnus-score-find-bnews)
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		(repeat :tag "List of functions"
			(choice (function :tag "Other" :value 'ignore)
				(function-item gnus-score-find-single)
				(function-item gnus-score-find-hierarchical)
				(function-item gnus-score-find-bnews)))
		(function :tag "Other" :value 'ignore)))
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(defcustom gnus-score-interactive-default-score 1000
  "*Scoring commands will raise/lower the score with this number as the default."
  :group 'gnus-score-default
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  :type 'integer)
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(defcustom gnus-score-expiry-days 7
  "*Number of days before unused score file entries are expired.
If this variable is nil, no score file entries will be expired."
  :group 'gnus-score-expire
  :type '(choice (const :tag "never" nil)
		 number))

(defcustom gnus-update-score-entry-dates t
  "*In non-nil, update matching score entry dates.
If this variable is nil, then score entries that provide matches
will be expired along with non-matching score entries."
  :group 'gnus-score-expire
  :type 'boolean)

(defcustom gnus-decay-scores nil
  "*If non-nil, decay non-permanent scores."
  :group 'gnus-score-decay
  :type 'boolean)

(defcustom gnus-decay-score-function 'gnus-decay-score
  "*Function called to decay a score.
It is called with one parameter -- the score to be decayed."
  :group 'gnus-score-decay
  :type '(radio (function-item gnus-decay-score)
		(function :tag "Other")))

(defcustom gnus-score-decay-constant 3
  "*Decay all \"small\" scores with this amount."
  :group 'gnus-score-decay
  :type 'integer)

(defcustom gnus-score-decay-scale .05
  "*Decay all \"big\" scores with this factor."
  :group 'gnus-score-decay
  :type 'number)

(defcustom gnus-home-score-file nil
  "Variable to control where interactive score entries are to go.
It can be:

 * A string
   This file file will be used as the home score file.

 * A function
   The result of this function will be used as the home score file.
   The function will be passed the name of the group as its
   parameter.

 * A list
   The elements in this list can be:

   * `(regexp file-name ...)'
     If the `regexp' matches the group name, the first `file-name' will
     will be used as the home score file.  (Multiple filenames are
     allowed so that one may use gnus-score-file-single-match-alist to
     set this variable.)

   * A function.
     If the function returns non-nil, the result will be used
     as the home score file.  The function will be passed the
     name of the group as its parameter.

   * A string.  Use the string as the home score file.

   The list will be traversed from the beginning towards the end looking
   for matches."
  :group 'gnus-score-files
  :type '(choice string
		 (repeat (choice string
				 (cons regexp (repeat file))
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				 (function :value fun)))
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		 (function-item gnus-hierarchial-home-score-file)
		 (function-item gnus-current-home-score-file)
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		 (function :value fun)))
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(defcustom gnus-home-adapt-file nil
  "Variable to control where new adaptive score entries are to go.
This variable allows the same syntax as `gnus-home-score-file'."
  :group 'gnus-score-adapt
  :group 'gnus-score-files
  :type '(choice string
		 (repeat (choice string
				 (cons regexp (repeat file))
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				 (function :value fun)))
		 (function :value fun)))
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(defcustom gnus-default-adaptive-score-alist
  '((gnus-kill-file-mark)
    (gnus-unread-mark)
    (gnus-read-mark (from 3) (subject 30))
    (gnus-catchup-mark (subject -10))
    (gnus-killed-mark (from -1) (subject -20))
    (gnus-del-mark (from -2) (subject -15)))
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  "*Alist of marks and scores."
  :group 'gnus-score-adapt
  :type '(repeat (cons (symbol :tag "Mark")
		       (repeat (list (choice :tag "Header"
					     (const from)
					     (const subject)
					     (symbol :tag "other"))
				     (integer :tag "Score"))))))
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(defcustom gnus-adaptive-word-length-limit nil
  "*Words of a length lesser than this limit will be ignored when doing adaptive scoring."
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  :version "22.1"
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  :group 'gnus-score-adapt
  :type '(radio (const :format "Unlimited " nil)
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		(integer :format "Maximum length: %v")))
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(defcustom gnus-ignored-adaptive-words nil
  "List of words to be ignored when doing adaptive word scoring."
  :group 'gnus-score-adapt
  :type '(repeat string))

(defcustom gnus-default-ignored-adaptive-words
  '("a" "i" "the" "to" "of" "and" "in" "is" "it" "for" "that" "if" "you"
    "this" "be" "on" "with" "not" "have" "are" "or" "as" "from" "can"
    "but" "by" "at" "an" "will" "no" "all" "was" "do" "there" "my" "one"
    "so" "we" "they" "what" "would" "any" "which" "about" "get" "your"
    "use" "some" "me" "then" "name" "like" "out" "when" "up" "time"
    "other" "more" "only" "just" "end" "also" "know" "how" "new" "should"
    "been" "than" "them" "he" "who" "make" "may" "people" "these" "now"
    "their" "here" "into" "first" "could" "way" "had" "see" "work" "well"
    "were" "two" "very" "where" "while" "us" "because" "good" "same"
    "even" "much" "most" "many" "such" "long" "his" "over" "last" "since"
    "right" "before" "our" "without" "too" "those" "why" "must" "part"
    "being" "current" "back" "still" "go" "point" "value" "each" "did"
    "both" "true" "off" "say" "another" "state" "might" "under" "start"
    "try" "re")
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  "*Default list of words to be ignored when doing adaptive word scoring."
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  :group 'gnus-score-adapt
  :type '(repeat string))

(defcustom gnus-default-adaptive-word-score-alist
  `((,gnus-read-mark . 30)
    (,gnus-catchup-mark . -10)
    (,gnus-killed-mark . -20)
    (,gnus-del-mark . -15))
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  "*Alist of marks and scores."
  :group 'gnus-score-adapt
  :type '(repeat (cons (character :tag "Mark")
		       (integer :tag "Score"))))
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(defcustom gnus-adaptive-word-minimum nil
  "If a number, this is the minimum score value that can be assigned to a word."
  :group 'gnus-score-adapt
  :type '(choice (const nil) integer))

(defcustom gnus-adaptive-word-no-group-words nil
  "If t, don't adaptively score words included in the group name."
  :group 'gnus-score-adapt
  :type 'boolean)

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(defcustom gnus-score-mimic-keymap nil
  "*Have the score entry functions pretend that they are a keymap."
  :group 'gnus-score-default
  :type 'boolean)

(defcustom gnus-score-exact-adapt-limit 10
  "*Number that says how long a match has to be before using substring matching.
When doing adaptive scoring, one normally uses fuzzy or substring
matching.  However, if the header one matches is short, the possibility
for false positives is great, so if the length of the match is less
than this variable, exact matching will be used.

If this variable is nil, exact matching will always be used."
  :group 'gnus-score-adapt
  :type '(choice (const nil) integer))

(defcustom gnus-score-uncacheable-files "ADAPT$"
  "All score files that match this regexp will not be cached."
  :group 'gnus-score-adapt
  :group 'gnus-score-files
  :type 'regexp)

(defcustom gnus-score-default-header nil
  "Default header when entering new scores.

Should be one of the following symbols.

 a: from
 s: subject
 b: body
 h: head
 i: message-id
 t: references
 x: xref
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 e: `extra' (non-standard overview)
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 l: lines
 d: date
 f: followup

If nil, the user will be asked for a header."
  :group 'gnus-score-default
  :type '(choice (const :tag "from" a)
		 (const :tag "subject" s)
		 (const :tag "body" b)
		 (const :tag "head" h)
		 (const :tag "message-id" i)
		 (const :tag "references" t)
		 (const :tag "xref" x)
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		 (const :tag "extra" e)
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		 (const :tag "lines" l)
		 (const :tag "date" d)
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		 (const :tag "followup" f)
		 (const :tag "ask" nil)))
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(defcustom gnus-score-default-type nil
  "Default match type when entering new scores.

Should be one of the following symbols.

 s: substring
 e: exact string
 f: fuzzy string
 r: regexp string
 b: before date
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 a: after date
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 n: this date
 <: less than number
 >: greater than number
 =: equal to number

If nil, the user will be asked for a match type."
  :group 'gnus-score-default
  :type '(choice (const :tag "substring" s)
		 (const :tag "exact string" e)
		 (const :tag "fuzzy string" f)
		 (const :tag "regexp string" r)
		 (const :tag "before date" b)
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		 (const :tag "after date" a)
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		 (const :tag "this date" n)
		 (const :tag "less than number" <)
		 (const :tag "greater than number" >)
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		 (const :tag "equal than number" =)
		 (const :tag "ask" nil)))
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(defcustom gnus-score-default-fold nil
  "Use case folding for new score file entries iff not nil."
  :group 'gnus-score-default
  :type 'boolean)

(defcustom gnus-score-default-duration nil
  "Default duration of effect when entering new scores.

Should be one of the following symbols.

 t: temporary
 p: permanent
 i: immediate

If nil, the user will be asked for a duration."
  :group 'gnus-score-default
  :type '(choice (const :tag "temporary" t)
		 (const :tag "permanent" p)
		 (const :tag "immediate" i)
		 (const :tag "ask" nil)))

(defcustom gnus-score-after-write-file-function nil
  "Function called with the name of the score file just written to disk."
  :group 'gnus-score-files
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  :type '(choice (const nil) function))
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(defcustom gnus-score-thread-simplify nil
  "If non-nil, subjects will simplified as in threading."
  :group 'gnus-score-various
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  :type 'boolean)
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;; Internal variables.

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(defvar gnus-score-use-all-scores t
  "If nil, only `gnus-score-find-score-files-function' is used.")

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(defvar gnus-adaptive-word-syntax-table
  (let ((table (copy-syntax-table (standard-syntax-table)))
	(numbers '(?0 ?1 ?2 ?3 ?4 ?5 ?6 ?7 ?8 ?9)))
    (while numbers
      (modify-syntax-entry (pop numbers) " " table))
    (modify-syntax-entry ?' "w" table)
    table)
  "Syntax table used when doing adaptive word scoring.")

(defvar gnus-scores-exclude-files nil)
(defvar gnus-internal-global-score-files nil)
(defvar gnus-score-file-list nil)

(defvar gnus-short-name-score-file-cache nil)

(defvar gnus-score-help-winconf nil)
(defvar gnus-adaptive-score-alist gnus-default-adaptive-score-alist)
(defvar gnus-adaptive-word-score-alist gnus-default-adaptive-word-score-alist)
(defvar gnus-score-trace nil)
(defvar gnus-score-edit-buffer nil)

(defvar gnus-score-alist nil
  "Alist containing score information.
The keys can be symbols or strings.  The following symbols are defined.

touched: If this alist has been modified.
mark:    Automatically mark articles below this.
expunge: Automatically expunge articles below this.
files:   List of other score files to load when loading this one.
eval:    Sexp to be evaluated when the score file is loaded.

String entries have the form (HEADER (MATCH TYPE SCORE DATE) ...)
where HEADER is the header being scored, MATCH is the string we are
looking for, TYPE is a flag indicating whether it should use regexp or
substring matching, SCORE is the score to add and DATE is the date
of the last successful match.")

(defvar gnus-score-cache nil)
(defvar gnus-scores-articles nil)
(defvar gnus-score-index nil)


(defconst gnus-header-index
  ;; Name to index alist.
  '(("number" 0 gnus-score-integer)
    ("subject" 1 gnus-score-string)
    ("from" 2 gnus-score-string)
    ("date" 3 gnus-score-date)
    ("message-id" 4 gnus-score-string)
    ("references" 5 gnus-score-string)
    ("chars" 6 gnus-score-integer)
    ("lines" 7 gnus-score-integer)
    ("xref" 8 gnus-score-string)
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    ("extra" 9 gnus-score-string)
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    ("head" -1 gnus-score-body)
    ("body" -1 gnus-score-body)
    ("all" -1 gnus-score-body)
    ("followup" 2 gnus-score-followup)
    ("thread" 5 gnus-score-thread)))

;;; Summary mode score maps.

(gnus-define-keys (gnus-summary-score-map "V" gnus-summary-mode-map)
  "s" gnus-summary-set-score
  "S" gnus-summary-current-score
  "c" gnus-score-change-score-file
  "C" gnus-score-customize
  "m" gnus-score-set-mark-below
  "x" gnus-score-set-expunge-below
  "R" gnus-summary-rescore
  "e" gnus-score-edit-current-scores
  "f" gnus-score-edit-file
  "F" gnus-score-flush-cache
  "t" gnus-score-find-trace
  "w" gnus-score-find-favourite-words)

;; Summary score file commands

;; Much modification of the kill (ahem, score) code and lots of the
;; functions are written by Per Abrahamsen <amanda@iesd.auc.dk>.

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(defun gnus-summary-lower-score (&optional score symp)
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  "Make a score entry based on the current article.
The user will be prompted for header to score on, match type,
permanence, and the string to be used.  The numerical prefix will be
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used as score.  A symbolic prefix of `a' says to use the `all.SCORE'
file for the command instead of the current score file."
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  (interactive (gnus-interactive "P\ny"))
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  (gnus-summary-increase-score (- (gnus-score-delta-default score)) symp))
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(defun gnus-score-kill-help-buffer ()
  (when (get-buffer "*Score Help*")
    (kill-buffer "*Score Help*")
    (when gnus-score-help-winconf
      (set-window-configuration gnus-score-help-winconf))))

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(defun gnus-summary-increase-score (&optional score symp)
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  "Make a score entry based on the current article.
The user will be prompted for header to score on, match type,
permanence, and the string to be used.  The numerical prefix will be
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used as score.  A symbolic prefix of `a' says to use the `all.SCORE'
file for the command instead of the current score file."
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  (interactive (gnus-interactive "P\ny"))
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  (let* ((nscore (gnus-score-delta-default score))
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	 (prefix (if (< nscore 0) ?L ?I))
	 (increase (> nscore 0))
	 (char-to-header
	  '((?a "from" nil nil string)
	    (?s "subject" nil nil string)
	    (?b "body" "" nil body-string)
	    (?h "head" "" nil body-string)
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	    (?i "message-id" nil nil string)
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	    (?r "references" "message-id" nil string)
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	    (?x "xref" nil nil string)
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	    (?e "extra" nil nil string)
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	    (?l "lines" nil nil number)
	    (?d "date" nil nil date)
	    (?f "followup" nil nil string)
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	    (?t "thread" "message-id" nil string)))
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	 (char-to-type
	  '((?s s "substring" string)
	    (?e e "exact string" string)
	    (?f f "fuzzy string" string)
	    (?r r "regexp string" string)
	    (?z s "substring" body-string)
	    (?p r "regexp string" body-string)
	    (?b before "before date" date)
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	    (?a after "after date" date)
	    (?n at "this date" date)
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	    (?< < "less than number" number)
	    (?> > "greater than number" number)
	    (?= = "equal to number" number)))
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	 (current-score-file gnus-current-score-file)
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	 (char-to-perm
	  (list (list ?t (current-time-string) "temporary")
		'(?p perm "permanent") '(?i now "immediate")))
	 (mimic gnus-score-mimic-keymap)
	 (hchar (and gnus-score-default-header
		     (aref (symbol-name gnus-score-default-header) 0)))
	 (tchar (and gnus-score-default-type
		     (aref (symbol-name gnus-score-default-type) 0)))
	 (pchar (and gnus-score-default-duration
		     (aref (symbol-name gnus-score-default-duration) 0)))
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	 entry temporary type match extra)
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    (unwind-protect
	(progn

	  ;; First we read the header to score.
	  (while (not hchar)
	    (if mimic
		(progn
		  (sit-for 1)
		  (message "%c-" prefix))
	      (message "%s header (%s?): " (if increase "Increase" "Lower")
		       (mapconcat (lambda (s) (char-to-string (car s)))
				  char-to-header "")))
	    (setq hchar (read-char))
	    (when (or (= hchar ??) (= hchar ?\C-h))
	      (setq hchar nil)
	      (gnus-score-insert-help "Match on header" char-to-header 1)))

	  (gnus-score-kill-help-buffer)
	  (unless (setq entry (assq (downcase hchar) char-to-header))
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	    (if mimic (error "%c %c" prefix hchar)
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	      (error "Invalid header type")))
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	  (when (/= (downcase hchar) hchar)
	    ;; This was a majuscule, so we end reading and set the defaults.
	    (if mimic (message "%c %c" prefix hchar) (message ""))
	    (setq tchar (or tchar ?s)
		  pchar (or pchar ?t)))

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	  (let ((legal-types
		 (delq nil
		       (mapcar (lambda (s)
				 (if (eq (nth 4 entry)
					 (nth 3 s))
				     s nil))
			       char-to-type))))
	    ;; We continue reading - the type.
	    (while (not tchar)
	      (if mimic
		  (progn
		    (sit-for 1) (message "%c %c-" prefix hchar))
		(message "%s header '%s' with match type (%s?): "
			 (if increase "Increase" "Lower")
			 (nth 1 entry)
			 (mapconcat (lambda (s) (char-to-string (car s)))
				    legal-types "")))
	      (setq tchar (read-char))
	      (when (or (= tchar ??) (= tchar ?\C-h))
		(setq tchar nil)
		(gnus-score-insert-help "Match type" legal-types 2)))

	    (gnus-score-kill-help-buffer)
	    (unless (setq type (nth 1 (assq (downcase tchar) legal-types)))
	      (if mimic (error "%c %c" prefix hchar)
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		(error "Invalid match type"))))
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	  (when (/= (downcase tchar) tchar)
	    ;; It was a majuscule, so we end reading and use the default.
	    (if mimic (message "%c %c %c" prefix hchar tchar)
	      (message ""))
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	    (setq pchar (or pchar ?t)))
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	  ;; We continue reading.
	  (while (not pchar)
	    (if mimic
		(progn
		  (sit-for 1) (message "%c %c %c-" prefix hchar tchar))
	      (message "%s permanence (%s?): " (if increase "Increase" "Lower")
		       (mapconcat (lambda (s) (char-to-string (car s)))
				  char-to-perm "")))
	    (setq pchar (read-char))
	    (when (or (= pchar ??) (= pchar ?\C-h))
	      (setq pchar nil)
	      (gnus-score-insert-help "Match permanence" char-to-perm 2)))

	  (gnus-score-kill-help-buffer)
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	  (if mimic (message "%c %c %c %c" prefix hchar tchar pchar)
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	    (message ""))
	  (unless (setq temporary (cadr (assq pchar char-to-perm)))
	    ;; Deal with der(r)ided superannuated paradigms.
	    (when (and (eq (1+ prefix) 77)
		       (eq (+ hchar 12) 109)
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		       (eq (1- tchar) 113)
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		       (eq (- pchar 4) 111))
	      (error "You rang?"))
	    (if mimic
		(error "%c %c %c %c" prefix hchar tchar pchar)
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	      (error "Invalid match duration"))))
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      ;; Always kill the score help buffer.
      (gnus-score-kill-help-buffer))

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    ;; If scoring an extra (non-standard overview) header,
    ;; we must find out which header is in question.
    (setq extra
	  (and gnus-extra-headers
	       (equal (nth 1 entry) "extra")
	       (intern			; need symbol
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		(gnus-completing-read-with-default
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		 (symbol-name (car gnus-extra-headers))	; default response
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		 "Score extra header"	; prompt
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		 (mapcar (lambda (x)	; completion list
			   (cons (symbol-name x) x))
			 gnus-extra-headers)
		 nil			; no completion limit
		 t))))			; require match
    ;; extra is now nil or a symbol.

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    ;; We have all the data, so we enter this score.
    (setq match (if (string= (nth 2 entry) "") ""
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		  (gnus-summary-header (or (nth 2 entry) (nth 1 entry))
				       nil extra)))
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    ;; Modify the match, perhaps.
    (cond
     ((equal (nth 1 entry) "xref")
      (when (string-match "^Xref: *" match)
	(setq match (substring match (match-end 0))))
      (when (string-match "^[^:]* +" match)
	(setq match (substring match (match-end 0))))))

    (when (memq type '(r R regexp Regexp))
      (setq match (regexp-quote match)))

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    ;; Change score file to the "all.SCORE" file.
    (when (eq symp 'a)
      (save-excursion
	(set-buffer gnus-summary-buffer)
	(gnus-score-load-file
	 ;; This is a kludge; yes...
	 (cond
	  ((eq gnus-score-find-score-files-function
	       'gnus-score-find-hierarchical)
	   (gnus-score-file-name ""))
	  ((eq gnus-score-find-score-files-function 'gnus-score-find-single)
	   current-score-file)
	  (t
	   (gnus-score-file-name "all"))))))
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    (gnus-summary-score-entry
     (nth 1 entry)			; Header
     match				; Match
     type				; Type
     (if (eq score 's) nil score)	; Score
     (if (eq temporary 'perm)		; Temp
	 nil
       temporary)
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     (not (nth 3 entry))		; Prompt
     nil				; not silent
     extra)				; non-standard overview.
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    (when (eq symp 'a)
      ;; We change the score file back to the previous one.
      (save-excursion
	(set-buffer gnus-summary-buffer)
	(gnus-score-load-file current-score-file)))))
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(defun gnus-score-insert-help (string alist idx)
  (setq gnus-score-help-winconf (current-window-configuration))
  (save-excursion
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    (set-buffer (gnus-get-buffer-create "*Score Help*"))
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    (buffer-disable-undo)
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    (delete-windows-on (current-buffer))
    (erase-buffer)
    (insert string ":\n\n")
    (let ((max -1)
	  (list alist)
	  (i 0)
	  n width pad format)
      ;; find the longest string to display
      (while list
	(setq n (length (nth idx (car list))))
	(unless (> max n)
	  (setq max n))
	(setq list (cdr list)))
      (setq max (+ max 4))		; %c, `:', SPACE, a SPACE at end
      (setq n (/ (1- (window-width)) max)) ; items per line
      (setq width (/ (1- (window-width)) n)) ; width of each item
      ;; insert `n' items, each in a field of width `width'
      (while alist
	(if (< i n)
	    ()
	  (setq i 0)
	  (delete-char -1)		; the `\n' takes a char
	  (insert "\n"))
	(setq pad (- width 3))
	(setq format (concat "%c: %-" (int-to-string pad) "s"))
	(insert (format format (caar alist) (nth idx (car alist))))
	(setq alist (cdr alist))
	(setq i (1+ i))))
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    (goto-char (point-min))
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    ;; display ourselves in a small window at the bottom
    (gnus-appt-select-lowest-window)
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    (if (< (/ (window-height) 2) window-min-height)
	(switch-to-buffer "*Score Help*")
      (split-window)
      (pop-to-buffer "*Score Help*"))
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    (let ((window-min-height 1))
      (shrink-window-if-larger-than-buffer))
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    (select-window (gnus-get-buffer-window gnus-summary-buffer t))))
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(defun gnus-summary-header (header &optional no-err extra)
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  ;; Return HEADER for current articles, or error.
  (let ((article (gnus-summary-article-number))
	headers)
    (if article
	(if (and (setq headers (gnus-summary-article-header article))
		 (vectorp headers))
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	    (if extra			; `header' must be "extra"
		(or (cdr (assq extra (mail-header-extra headers))) "")
	      (aref headers (nth 1 (assoc header gnus-header-index))))
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	  (if no-err
	      nil
	    (error "Pseudo-articles can't be scored")))
      (if no-err
	  (error "No article on current line")
	nil))))

(defun gnus-newsgroup-score-alist ()
  (or
   (let ((param-file (gnus-group-find-parameter
		      gnus-newsgroup-name 'score-file)))
     (when param-file
       (gnus-score-load param-file)))
   (gnus-score-load
    (gnus-score-file-name gnus-newsgroup-name)))
  gnus-score-alist)

(defsubst gnus-score-get (symbol &optional alist)
  ;; Get SYMBOL's definition in ALIST.
  (cdr (assoc symbol
	      (or alist
		  gnus-score-alist
		  (gnus-newsgroup-score-alist)))))

(defun gnus-summary-score-entry (header match type score date
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					&optional prompt silent extra)
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  "Enter score file entry.
HEADER is the header being scored.
MATCH is the string we are looking for.
TYPE is the match type: substring, regexp, exact, fuzzy.
SCORE is the score to add.
DATE is the expire date, or nil for no expire, or 'now for immediate expire.
If optional argument `PROMPT' is non-nil, allow user to edit match.
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If optional argument `SILENT' is nil, show effect of score entry.
If optional argument `EXTRA' is non-nil, it's a non-standard overview header."
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  ;; Regexp is the default type.
  (when (eq type t)
    (setq type 'r))
  ;; Simplify matches...
  (cond ((or (eq type 'r) (eq type 's) (eq type nil))
	 (setq match (if match (gnus-simplify-subject-re match) "")))
	((eq type 'f)
	 (setq match (gnus-simplify-subject-fuzzy match))))
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  (let ((score (gnus-score-delta-default score))
	(header (downcase header))
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	new)
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    (set-text-properties 0 (length header) nil header)
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    (when prompt
      (setq match (read-string
		   (format "Match %s on %s, %s: "
			   (cond ((eq date 'now)
				  "now")
				 ((stringp date)
				  "temp")
				 (t "permanent"))
			   header
			   (if (< score 0) "lower" "raise"))
		   (if (numberp match)
		       (int-to-string match)
		     match))))

    ;; If this is an integer comparison, we transform from string to int.
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    (if (eq (nth 2 (assoc header gnus-header-index)) 'gnus-score-integer)
	(if (stringp match)
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	    (setq match (string-to-number match)))
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      (set-text-properties 0 (length match) nil match))
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    (unless (eq date 'now)
      ;; Add the score entry to the score file.
      (when (= score gnus-score-interactive-default-score)
	(setq score nil))
      (let ((old (gnus-score-get header))
	    elem)
	(setq new
	      (cond
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	       (extra
		(list match score
		      (and date (if (numberp date) date
				  (date-to-day date)))
		      type (symbol-name extra)))
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	       (type
		(list match score
		      (and date (if (numberp date) date
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				  (date-to-day date)))
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		      type))
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	       (date (list match score (date-to-day date)))
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	       (score (list match score))
	       (t (list match))))
	;; We see whether we can collapse some score entries.
	;; This isn't quite correct, because there may be more elements
	;; later on with the same key that have matching elems...  Hm.
	(if (and old
		 (setq elem (assoc match old))
		 (eq (nth 3 elem) (nth 3 new))
		 (or (and (numberp (nth 2 elem)) (numberp (nth 2 new)))
		     (and (not (nth 2 elem)) (not (nth 2 new)))))
	    ;; Yup, we just add this new score to the old elem.
	    (setcar (cdr elem) (+ (or (nth 1 elem)
				      gnus-score-interactive-default-score)
				  (or (nth 1 new)
				      gnus-score-interactive-default-score)))
	  ;; Nope, we have to add a new elem.
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	  (gnus-score-set header (if old (cons new old) (list new)) nil t))
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	(gnus-score-set 'touched '(t))))

    ;; Score the current buffer.
    (unless silent
      (if (and (>= (nth 1 (assoc header gnus-header-index)) 0)
	       (eq (nth 2 (assoc header gnus-header-index))
		   'gnus-score-string))
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	  (gnus-summary-score-effect header match type score extra)
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	(gnus-summary-rescore)))

    ;; Return the new scoring rule.
    new))

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(defun gnus-summary-score-effect (header match type score &optional extra)
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  "Simulate the effect of a score file entry.
HEADER is the header being scored.
MATCH is the string we are looking for.
TYPE is the score type.
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SCORE is the score to add.
EXTRA is the possible non-standard header."
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  (interactive (list (completing-read "Header: "
				      gnus-header-index
				      (lambda (x) (fboundp (nth 2 x)))
				      t)
		     (read-string "Match: ")
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		     (if (y-or-n-p "Use regexp match? ") 'r 's)
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		     (string-to-number (read-string "Score: "))))
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  (save-excursion
    (unless (and (stringp match) (> (length match) 0))
      (error "No match"))
    (goto-char (point-min))
    (let ((regexp (cond ((eq type 'f)
			 (gnus-simplify-subject-fuzzy match))
			((eq type 'r)
			 match)
			((eq type 'e)
			 (concat "\\`" (regexp-quote match) "\\'"))
			(t
			 (regexp-quote match)))))
      (while (not (eobp))
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	(let ((content (gnus-summary-header header 'noerr extra))
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	      (case-fold-search t))
	  (and content
	       (when (if (eq type 'f)
			 (string-equal (gnus-simplify-subject-fuzzy content)
				       regexp)
		       (string-match regexp content))
		 (gnus-summary-raise-score score))))
	(beginning-of-line 2))))
  (gnus-set-mode-line 'summary))

(defun gnus-summary-score-crossposting (score date)
  ;; Enter score file entry for current crossposting.
  ;; SCORE is the score to add.
  ;; DATE is the expire date.
  (let ((xref (gnus-summary-header "xref"))
	(start 0)
	group)
    (unless xref
      (error "This article is not crossposted"))
    (while (string-match " \\([^ \t]+\\):" xref start)
      (setq start (match-end 0))
      (when (not (string=
		  (setq group
			(substring xref (match-beginning 1) (match-end 1)))
		  gnus-newsgroup-name))
	(gnus-summary-score-entry
	 "xref" (concat " " group ":") nil score date t)))))


;;;
;;; Gnus Score Files
;;;

;; All score code written by Per Abrahamsen <abraham@iesd.auc.dk>.

(defun gnus-score-set-mark-below (score)
  "Automatically mark articles with score below SCORE as read."
  (interactive
   (list (or (and current-prefix-arg (prefix-numeric-value current-prefix-arg))
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	     (string-to-number (read-string "Mark below: ")))))
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  (setq score (or score gnus-summary-default-score 0))
  (gnus-score-set 'mark (list score))
  (gnus-score-set 'touched '(t))
  (setq gnus-summary-mark-below score)
  (gnus-score-update-lines))

(defun gnus-score-update-lines ()
  "Update all lines in the summary buffer."
  (save-excursion
    (goto-char (point-min))
    (while (not (eobp))
      (gnus-summary-update-line)
      (forward-line 1))))

(defun gnus-score-update-all-lines ()
  "Update all lines in the summary buffer, even the hidden ones."
  (save-excursion
    (goto-char (point-min))
    (let (hidden)
      (while (not (eobp))
	(when (gnus-summary-show-thread)
	  (push (point) hidden))
	(gnus-summary-update-line)
	(forward-line 1))
      ;; Re-hide the hidden threads.
      (while hidden
	(goto-char (pop hidden))
	(gnus-summary-hide-thread)))))

(defun gnus-score-set-expunge-below (score)
  "Automatically expunge articles with score below SCORE."
  (interactive
   (list (or (and current-prefix-arg (prefix-numeric-value current-prefix-arg))
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	     (string-to-number (read-string "Set expunge below: ")))))
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  (setq score (or score gnus-summary-default-score 0))
  (gnus-score-set 'expunge (list score))
  (gnus-score-set 'touched '(t)))

(defun gnus-score-followup-article (&optional score)
  "Add SCORE to all followups to the article in the current buffer."
  (interactive "P")
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  (setq score (gnus-score-delta-default score))
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  (when (gnus-buffer-live-p gnus-summary-buffer)
    (save-excursion
      (save-restriction
	(message-narrow-to-headers)
	(let ((id (mail-fetch-field "message-id")))
	  (when id
	    (set-buffer gnus-summary-buffer)
	    (gnus-summary-score-entry
	     "references" (concat id "[ \t]*$") 'r
	     score (current-time-string) nil t)))))))

(defun gnus-score-followup-thread (&optional score)
  "Add SCORE to all later articles in the thread the current buffer is part of."
  (interactive "P")
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  (setq score (gnus-score-delta-default score))
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  (when (gnus-buffer-live-p gnus-summary-buffer)
    (save-excursion
      (save-restriction
	(goto-char (point-min))
	(let ((id (mail-fetch-field "message-id")))
	  (when id
	    (set-buffer gnus-summary-buffer)
	    (gnus-summary-score-entry
	     "references" id 's
	     score (current-time-string))))))))

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(defun gnus-score-set (symbol value &optional alist warn)
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  ;; Set SYMBOL to VALUE in ALIST.
  (let* ((alist
	  (or alist
	      gnus-score-alist
	      (gnus-newsgroup-score-alist)))
	 (entry (assoc symbol alist)))
    (cond ((gnus-score-get 'read-only alist)
	   ;; This is a read-only score file, so we do nothing.
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	   (when warn
	     (gnus-message 4 "Note: read-only score file; entry discarded")))
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	  (entry
	   (setcdr entry value))
	  ((null alist)
	   (error "Empty alist"))
	  (t
	   (setcdr alist
		   (cons (cons symbol value) (cdr alist)))))))

(defun gnus-summary-raise-score (n)
  "Raise the score of the current article by N."
  (interactive "p")
  (gnus-summary-set-score (+ (gnus-summary-article-score)
			     (or n gnus-score-interactive-default-score ))))

(defun gnus-summary-set-score (n)
  "Set the score of the current article to N."
  (interactive "p")
  (save-excursion
    (gnus-summary-show-thread)
    (let ((buffer-read-only nil))
      ;; Set score.
      (gnus-summary-update-mark
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       (if (= n (or gnus-summary-default-score 0)) ?  ;Whitespace
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	 (if (< n (or gnus-summary-default-score 0))
	     gnus-score-below-mark gnus-score-over-mark))
       'score))
    (let* ((article (gnus-summary-article-number))
	   (score (assq article gnus-newsgroup-scored)))
      (if score (setcdr score n)
	(push (cons article n) gnus-newsgroup-scored)))
    (gnus-summary-update-line)))

(defun gnus-summary-current-score ()
  "Return the score of the current article."
  (interactive)
  (gnus-message 1 "%s" (gnus-summary-article-score)))

(defun gnus-score-change-score-file (file)
  "Change current score alist."
  (interactive
   (list (read-file-name "Change to score file: " gnus-kill-files-directory)))
  (gnus-score-load-file file)
  (gnus-set-mode-line 'summary))

(defvar gnus-score-edit-exit-function)
(defun gnus-score-edit-current-scores (file)
  "Edit the current score alist."
  (interactive (list gnus-current-score-file))
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  (if (not gnus-current-score-file)
      (error "No current score file")
    (let ((winconf (current-window-configuration)))
      (when (buffer-name gnus-summary-buffer)
	(gnus-score-save))
      (gnus-make-directory (file-name-directory file))
      (setq gnus-score-edit-buffer (find-file-noselect file))
      (gnus-configure-windows 'edit-score)
      (gnus-score-mode)
      (setq gnus-score-edit-exit-function 'gnus-score-edit-done)
      (make-local-variable 'gnus-prev-winconf)
      (setq gnus-prev-winconf winconf))
    (gnus-message
     4 (substitute-command-keys
	"\\<gnus-score-mode-map>\\[gnus-score-edit-exit] to save edits"))))
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(defun gnus-score-edit-file (file)
  "Edit a score file."
  (interactive
   (list (read-file-name "Edit score file: " gnus-kill-files-directory)))
  (gnus-make-directory (file-name-directory file))
  (when (buffer-name gnus-summary-buffer)
    (gnus-score-save))
  (let ((winconf (current-window-configuration)))
    (setq gnus-score-edit-buffer (find-file-noselect file))
    (gnus-configure-windows 'edit-score)
    (gnus-score-mode)
    (setq gnus-score-edit-exit-function 'gnus-score-edit-done)
    (make-local-variable 'gnus-prev-winconf)
    (setq gnus-prev-winconf winconf))
  (gnus-message
   4 (substitute-command-keys
      "\\<gnus-score-mode-map>\\[gnus-score-edit-exit] to save edits")))

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(defun gnus-score-edit-file-at-point (&optional format)
  "Edit score file at point in Score Trace buffers.
If FORMAT, also format the current score file."
  (let* ((rule (save-excursion
		 (beginning-of-line)
		 (read (current-buffer))))
	 (sep "[ \n\r\t]*")
	 ;; Must be synced with `gnus-score-find-trace':
	 (reg " -> +")
	 (file (save-excursion
		 (end-of-line)
		 (if (and (re-search-backward reg (gnus-point-at-bol) t)
			  (re-search-forward  reg (gnus-point-at-eol) t))
		     (buffer-substring (point) (gnus-point-at-eol))
		   nil))))
    (if (or (not file)
	    (string-match "\\<\\(non-file rule\\|A file\\)\\>" file)
	    ;; (see `gnus-score-find-trace' and `gnus-score-advanced')
	    (string= "" file))
	(gnus-error 3 "Can't find a score file in current line.")
      (gnus-score-edit-file file)
      (when format
	(gnus-score-pretty-print))
      (when (consp rule) ;; the rule exists
	(setq rule (mapconcat #'(lambda (obj)
				  (regexp-quote (format "%S" obj)))
			      rule
			      sep))
	(goto-char (point-min))
	(re-search-forward rule nil t)
	;; make it easy to use `kill-sexp':
	(goto-char (1- (match-beginning 0)))))))

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(defun gnus-score-load-file (file)
  ;; Load score file FILE.  Returns a list a retrieved score-alists.
  (let* ((file (expand-file-name
		(or (and (string-match
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			  (concat "^" (regexp-quote
				       (expand-file-name
					gnus-kill-files-directory)))
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			  (expand-file-name file))
			 file)
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		    (expand-file-name file gnus-kill-files-directory))))
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	 (cached (assoc file gnus-score-cache))
	 (global (member file gnus-internal-global-score-files))
	 lists alist)
    (if cached
	;; The score file was already loaded.
	(setq alist (cdr cached))
      ;; We load the score file.
      (setq gnus-score-alist nil)
      (setq alist (gnus-score-load-score-alist file))
      ;; We add '(touched) to the alist to signify that it hasn't been
      ;; touched (yet).
      (unless (assq 'touched alist)
	(push (list 'touched nil) alist))
      ;; If it is a global score file, we make it read-only.
      (and global
	   (not (assq 'read-only alist))
	   (push (list 'read-only t) alist))
      (push (cons file alist) gnus-score-cache))
    (let ((a alist)
	  found)
      (while a
	;; Downcase all header names.
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	(cond
	 ((stringp (caar a))
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	  (setcar (car a) (downcase (caar a)))
	  (setq found t))
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	 ;; Advanced scoring.
	 ((consp (caar a))
	  (setq found t)))
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	(pop a))
      ;; If there are actual scores in the alist, we add it to the
      ;; return value of this function.
      (when found
	(setq lists (list alist))))
    ;; Treat the other possible atoms in the score alist.
    (let ((mark (car (gnus-score-get 'mark alist)))
	  (expunge (car (gnus-score-get 'expunge alist)))
	  (mark-and-expunge (car (gnus-score-get 'mark-and-expunge alist)))
	  (files (gnus-score-get 'files alist))
	  (exclude-files (gnus-score-get 'exclude-files alist))
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	  (orphan (car (gnus-score-get 'orphan alist)))
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	  (adapt (gnus-score-get 'adapt alist))
	  (thread-mark-and-expunge
	   (car (gnus-score-get 'thread-mark-and-expunge alist)))
	  (adapt-file (car (gnus-score-get 'adapt-file alist)))
	  (local (gnus-score-get 'local alist))
	  (decay (car (gnus-score-get 'decay alist)))
	  (eval (car (gnus-score-get 'eval alist))))
      ;; Perform possible decays.
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      (when (and gnus-decay-scores
		 (or cached (file-exists-p file))
		 (or (not decay)
		     (gnus-decay-scores alist decay)))
	(gnus-score-set 'touched '(t) alist)
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	(gnus-score-set 'decay (list (time-to-days (current-time))) alist))
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      ;; We do not respect eval and files atoms from global score
      ;; files.
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      (when (and files (not global))
	(setq lists (apply 'append lists
			   (mapcar (lambda (file)
				     (gnus-score-load-file file))
				   (if adapt-file (cons adapt-file files)
				     files)))))
      (when (and eval (not global))
	(eval eval))
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      ;; We then expand any exclude-file directives.
      (setq gnus-scores-exclude-files
	    (nconc
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	     (apply
	      'nconc
	      (mapcar
	       (lambda (sfile)
		 (list
		  (expand-file-name sfile (file-name-directory file))
		  (expand-file-name sfile gnus-kill-files-directory)))
	       exclude-files))
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	     gnus-scores-exclude-files))
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      (when local
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	(save-excursion
	  (set-buffer gnus-summary-buffer)
	  (while local
	    (and (consp (car local))
		 (symbolp (caar local))
		 (progn
		   (make-local-variable (caar local))
		   (set (caar local) (nth 1 (car local)))))
	    (setq local (cdr local)))))
      (when orphan
	(setq gnus-orphan-score orphan))
      (setq gnus-adaptive-score-alist
	    (cond ((equal adapt '(t))
		   (setq gnus-newsgroup-adaptive t)
		   gnus-default-adaptive-score-alist)
		  ((equal adapt '(ignore))
		   (setq gnus-newsgroup-adaptive nil))
		  ((consp adapt)
		   (setq gnus-newsgroup-adaptive t)
		   adapt)
		  (t
		   gnus-default-adaptive-score-alist)))
      (setq gnus-thread-expunge-below
	    (or thread-mark-and-expunge gnus-thread-expunge-below))
      (setq gnus-summary-mark-below
	    (or mark mark-and-expunge gnus-summary-mark-below))
      (setq gnus-summary-expunge-below
	    (or expunge mark-and-expunge gnus-summary-expunge-below))
      (setq gnus-newsgroup-adaptive-score-file
	    (or adapt-file gnus-newsgroup-adaptive-score-file)))
    (setq gnus-current-score-file file)
    (setq gnus-score-alist alist)
    lists))

(defun gnus-score-load (file)
  ;; Load score FILE.
  (let ((cache (assoc file gnus-score-cache)))
    (if cache
	(setq gnus-score-alist (cdr cache))
      (setq gnus-score-alist nil)
      (gnus-score-load-score-alist file)
      (unless gnus-score-alist
	(setq gnus-score-alist (copy-alist '((touched nil)))))
      (push (cons file gnus-score-alist) gnus-score-cache))))

(defun gnus-score-remove-from-cache (file)
  (setq gnus-score-cache
	(delq (assoc file gnus-score-cache) gnus-score-cache)))

(defun gnus-score-load-score-alist (file)
  "Read score FILE."
  (let (alist)
    (if (not (file-readable-p file))
	;; Couldn't read file.
	(setq gnus-score-alist nil)
      ;; Read file.
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      (with-temp-buffer
	(let ((coding-system-for-read score-mode-coding-system))
	  (insert-file-contents file))
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	(goto-char (point-min))
	;; Only do the loading if the score file isn't empty.
	(when (save-excursion (re-search-forward "[()0-9a-zA-Z]" nil t))
	  (setq alist
		(condition-case ()
		    (read (current-buffer))
		  (error
		   (gnus-error 3.2 "Problem with score file %s" file))))))
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      (cond
       ((and alist
	     (atom alist))
	;; Bogus score file.
	(error "Invalid syntax with score file %s" file))
       ((eq (car alist) 'setq)
	;; This is an old-style score file.
	(setq gnus-score-alist (gnus-score-transform-old-to-new alist)))
       (t
	(setq gnus-score-alist alist)))
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      ;; Check the syntax of the score file.
      (setq gnus-score-alist
	    (gnus-score-check-syntax gnus-score-alist file)))))

(defun gnus-score-check-syntax (alist file)
  "Check the syntax of the score ALIST."
  (cond
   ((null alist)
    nil)
   ((not (consp alist))
    (gnus-message 1 "Score file is not a list: %s" file)
    (ding)
    nil)
   (t
    (let ((a alist)
	  sr err s type)
      (while (and a (not err))
	(setq
	 err
	 (cond
	  ((not (listp (car a)))
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	   (format "Invalid score element %s in %s" (car a) file))
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	  ((stringp (caar a))
	   (cond
	    ((not (listp (setq sr (cdar a))))
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	     (format "Invalid header match %s in %s" (nth 1 (car a)) file))
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	    (t
	     (setq type (caar a))
	     (while (and sr (not err))
	       (setq s (pop sr))
	       (setq
		err
		(cond
		 ((if (member (downcase type) '("lines" "chars"))
		      (not (numberp (car s)))
		    (not (stringp (car s))))
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		  (format "Invalid match %s in %s" (car s) file))
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		 ((and (cadr s) (not (integerp (cadr s))))
		  (format "Non-integer score %s in %s" (cadr s) file))
		 ((and (caddr s) (not (integerp (caddr s))))
		  (format "Non-integer date %s in %s" (caddr s) file))
		 ((and (cadddr s) (not (symbolp (cadddr s))))
		  (format "Non-symbol match type %s in %s" (cadddr s) file)))))
	     err)))))
	(setq a (cdr a)))
      (if err
	  (progn
	    (ding)
	    (gnus-message 3 err)
	    (sit-for 2)
	    nil)
	alist)))))

(defun gnus-score-transform-old-to-new (alist)
  (let* ((alist (nth 2 alist))
	 out entry)
    (when (eq (car alist) 'quote)
      (setq alist (nth 1 alist)))
    (while alist
      (setq entry (car alist))
      (if (stringp (car entry))
	  (let ((scor (cdr entry)))
	    (push entry out)
	    (while scor
	      (setcar scor
		      (list (caar scor) (nth 2 (car scor))
			    (and (nth 3 (car scor))
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				 (date-to-day (nth 3 (car scor))))
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			    (if (nth 1 (car scor)) 'r 's)))
	      (setq scor (cdr scor))))
	(push (if (not (listp (cdr entry)))
		  (list (car entry) (cdr entry))
		entry)
	      out))
      (setq alist (cdr alist)))
    (cons (list 'touched t) (nreverse out))))

(defun gnus-score-save ()
  ;; Save all score information.
  (let ((cache gnus-score-cache)
	entry score file)
    (save-excursion
      (setq gnus-score-alist nil)
      (nnheader-set-temp-buffer " *Gnus Scores*")
      (while cache
	(current-buffer)
	(setq entry (pop cache)
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	      file (nnheader-translate-file-chars (car entry) t)
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	      score (cdr entry))
	(if (or (not (equal (gnus-score-get 'touched score) '(t)))
		(gnus-score-get 'read-only score)
		(and (file-exists-p file)
		     (not (file-writable-p file))))
	    ()
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	  (setq score (setcdr entry (gnus-delete-alist 'touched score)))
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	  (erase-buffer)
	  (let (emacs-lisp-mode-hook)
	    (if (string-match
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		 (concat (regexp-quote gnus-adaptive-file-suffix) "$")
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		 file)
		;; This is an adaptive score file, so we do not run
		;; it through `pp'.  These files can get huge, and
		;; are not meant to be edited by human hands.
		(gnus-prin1 score)
	      ;; This is a normal score file, so we print it very
	      ;; prettily.
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	      (let ((lisp-mode-syntax-table score-mode-syntax-table))
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		(gnus-pp score))))
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	  (gnus-make-directory (file-name-directory file))
	  ;; If the score file is empty, we delete it.
	  (if (zerop (buffer-size))
	      (delete-file file)
	    ;; There are scores, so we write the file.
	    (when (file-writable-p file)
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	      (let ((coding-system-for-write score-mode-coding-system))
		(gnus-write-buffer file))
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	      (when gnus-score-after-write-file-function
		(funcall gnus-score-after-write-file-function file)))))
	(and gnus-score-uncacheable-files
	     (string-match gnus-score-uncacheable-files file)
	     (gnus-score-remove-from-cache file)))
      (kill-buffer (current-buffer)))))

(defun gnus-score-load-files (score-files)
  "Load all score files in SCORE-FILES."
  ;; Load the score files.
  (let (scores)
    (while score-files
      (if (stringp (car score-files))
	  ;; It is a string, which means that it's a score file name,
	  ;; so we load the score file and add the score alist to
	  ;; the list of alists.
	  (setq scores (nconc (gnus-score-load-file (car score-files)) scores))
	;; It is an alist, so we just add it to the list directly.
	(setq scores (nconc (car score-files) scores)))
      (setq score-files (cdr score-files)))
    ;; Prune the score files that are to be excluded, if any.
    (when gnus-scores-exclude-files
      (let ((s scores)
	    c)
	(while s
	  (and (setq c (rassq (car s) gnus-score-cache))
	       (member (car c) gnus-scores-exclude-files)
	       (setq scores (delq (car s) scores)))
	  (setq s (cdr s)))))
    scores))

(defun gnus-score-headers (score-files &optional trace)
  ;; Score `gnus-newsgroup-headers'.
  (let (scores news)
    ;; PLM: probably this is not the best place to clear orphan-score
    (setq gnus-orphan-score nil
	  gnus-scores-articles nil
	  gnus-scores-exclude-files nil
	  scores (gnus-score-load-files score-files))
    (setq news scores)
    ;; Do the scoring.
    (while news
      (setq scores news
	    news nil)
      (when (and gnus-summary-default-score
		 scores)
	(let* ((entries gnus-header-index)
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	       (now (date-to-day (current-time-string)))
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	       (expire (and gnus-score-expiry-days
			    (- now gnus-score-expiry-days)))
	       (headers gnus-newsgroup-headers)
	       (current-score-file gnus-current-score-file)
	       entry header new)
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	  (gnus-message 7 "Scoring...")
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	  ;; Create articles, an alist of the form `(HEADER . SCORE)'.
	  (while (setq header (pop headers))
	    ;; WARNING: The assq makes the function O(N*S) while it could
	    ;; be written as O(N+S), where N is (length gnus-newsgroup-headers)
	    ;; and S is (length gnus-newsgroup-scored).
	    (unless (assq (mail-header-number header) gnus-newsgroup-scored)
	      (setq gnus-scores-articles ;Total of 2 * N cons-cells used.
		    (cons (cons header (or gnus-summary-default-score 0))
			  gnus-scores-articles))))

	  (save-excursion
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	    (set-buffer (gnus-get-buffer-create "*Headers*"))
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	    (buffer-disable-undo)
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	    (when (gnus-buffer-live-p gnus-summary-buffer)
	      (message-clone-locals gnus-summary-buffer))
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	    ;; Set the global variant of this variable.
	    (setq gnus-current-score-file current-score-file)
	    ;; score orphans
	    (when gnus-orphan-score
	      (setq gnus-score-index
		    (nth 1 (assoc "references" gnus-header-index)))
	      (gnus-score-orphans gnus-orphan-score))
	    ;; Run each header through the score process.
	    (while entries
	      (setq entry (pop entries)
		    header (nth 0 entry)
		    gnus-score-index (nth 1 (assoc header gnus-header-index)))
	      (when (< 0 (apply 'max (mapcar
				      (lambda (score)
					(length (gnus-score-get header score)))
				      scores)))
		;; Call the scoring function for this type of "header".
		(when (setq new (funcall (nth 2 entry) scores header
					 now expire trace))
		  (push new news))))
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	    (when (gnus-buffer-live-p gnus-summary-buffer)
	      (let ((scored gnus-newsgroup-scored))
		(with-current-buffer gnus-summary-buffer
		  (setq gnus-newsgroup-scored scored))))
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	    ;; Remove the buffer.
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	    (gnus-kill-buffer (current-buffer)))
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	  ;; Add articles to `gnus-newsgroup-scored'.
	  (while gnus-scores-articles
	    (when (or (/= gnus-summary-default-score
			  (cdar gnus-scores-articles))
		      gnus-save-score)
	      (push (cons (mail-header-number (caar gnus-scores-articles))
			  (cdar gnus-scores-articles))
		    gnus-newsgroup-scored))
	    (setq gnus-scores-articles (cdr gnus-scores-articles)))

	  (let (score)
	    (while (setq score (pop scores))
	      (while score
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		(when (consp (caar score))
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		  (gnus-score-advanced (car score) trace))
		(pop score))))

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	  (gnus-message 7 "Scoring...done"))))))
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(defun gnus-score-lower-thread (thread score-adjust)
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  "Lower the score on THREAD with SCORE-ADJUST.
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THREAD is expected to contain a list of the form `(PARENT [CHILD1
CHILD2 ...])' where PARENT is a header array and each CHILD is a list
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of the same form as THREAD.  The empty list nil is valid.  For each
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article in the tree, the score of the corresponding entry in
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`gnus-newsgroup-scored' is adjusted by SCORE-ADJUST."
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  (while thread
    (let ((head (car thread)))
      (if (listp head)
	  ;; handle a child and its descendants
	  (gnus-score-lower-thread head score-adjust)
	;; handle the parent
	(let* ((article (mail-header-number head))
	       (score (assq article gnus-newsgroup-scored)))
	  (if score (setcdr score (+ (cdr score) score-adjust))
	    (push (cons article score-adjust) gnus-newsgroup-scored)))))
    (setq thread (cdr thread))))
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(defun gnus-score-orphans (score)
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  "Score orphans.
A root is an article with no references.  An orphan is an article
which has references, but is not connected via its references to a
root article.  This function finds all the orphans, and adjusts their
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score in `gnus-newsgroup-scored' by SCORE."
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  ;; gnus-make-threads produces a list, where each entry is a "thread"
  ;; as described in the gnus-score-lower-thread docs.  This function
  ;; will be called again (after limiting has been done) if the display
  ;; is threaded.  It would be nice to somehow save this info and use
  ;; it later.
  (dolist (thread (gnus-make-threads))
    (let ((id (aref (car thread) gnus-score-index)))
      ;; If the parent of the thread is not a root, lower the score of
      ;; it and its descendants.  Note that some roots seem to satisfy
      ;; (eq id nil) and some (eq id "");  not sure why.
      (when (and id
		 (not (string= id "")))
	(gnus-score-lower-thread thread score)))))
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(defun gnus-score-integer (scores header now expire &optional trace)
  (let ((gnus-score-index (nth 1 (assoc header gnus-header-index)))
	entries alist)
    ;; Find matches.
    (while scores
      (setq alist (car scores)
	    scores (cdr scores)
	    entries (assoc header alist))
      (while (cdr entries)		;First entry is the header index.
	(let* ((rest (cdr entries))
	       (kill (car rest))
	       (match (nth 0 kill))
	       (type (or (nth 3 kill) '>))
	       (score (or (nth 1 kill) gnus-score-interactive-default-score))
	       (date (nth 2 kill))
	       (found nil)
	       (match-func (if (or (eq type '>) (eq type '<) (eq type '<=)
				   (eq type '>=) (eq type '=))
			       type
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			     (error "Invalid match type: %s" type)))
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