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[gnus] / lisp / gnus-score.el

;;; gnus-score.el --- scoring code for Gnus
;; Copyright (C) 1995,96 Free Software Foundation, Inc.

;; Author: Per Abrahamsen <amanda@iesd.auc.dk>
;;      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, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;;; Code:

(require 'gnus-load)
(require 'gnus-sum)
(require 'gnus-range)

(defvar 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.ifi.uio.no@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.ifi.uio.no:/pub/larsi/ding/score/soc.motss.SCORE\"
         \"/ftp.some-where:/pub/score\"))")

(defvar 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
use multiple matches, see gnus-score-file-multiple-match-alist).

These score files are loaded in addition to any files returned by
gnus-score-find-score-files-function (which see).")

(defvar 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
gnus-score-file-single-match-alist).

These score files are loaded in addition to any files returned by
gnus-score-find-score-files-function (which see).")

(defvar gnus-score-file-suffix "SCORE"
  "*Suffix of the score files.")

(defvar gnus-adaptive-file-suffix "ADAPT"
  "*Suffix of the adaptive score files.")

(defvar 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:

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.

See the documentation to these functions for more information.

This variable can also be a list of functions to be called.  Each
function should either return a list of score files, or a list of
score alists.")

(defvar gnus-score-interactive-default-score 1000
  "*Scoring commands will raise/lower the score with this number as the default.")

(defvar 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.")

(defvar 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.")

(defvar gnus-orphan-score nil
  "*All orphans get this score added. Set in the score file.")

(defvar gnus-home-score-file nil
  "Variable to control where interative 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.

 * A list
   The elements in this list can be:

   * `(regexp . file-name)'
     If the `regexp' matches the group name, the `file-name' will
     will be used as the home score file.

   * A function.
     If the function returns non-nil, the result will be used
     as the home score file.

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

   The list will be traversed from the beginning towards the end looking
   for matches.")

(defvar 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'.")

(defvar 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)))
"*Alist of marks and scores.")

(defvar gnus-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")
  "List of words to be ignored when doing adaptive word scoring.")
  
(defvar gnus-default-adaptive-word-score-alist  
  `((,gnus-read-mark . 30)
    (,gnus-catchup-mark . -10)
    (,gnus-killed-mark . -20)
    (,gnus-del-mark . -15))
"*Alist of marks and scores.")

(defvar gnus-score-mimic-keymap nil
  "*Have the score entry functions pretend that they are a keymap.")

(defvar 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.")

(defvar gnus-score-uncacheable-files "ADAPT$"
  "*All score files that match this regexp will not be cached.")

(defvar 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
 l: lines
 d: date
 f: followup

If nil, the user will be asked for a header.")

(defvar 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
 a: at date
 n: this date
 <: less than number
 >: greater than number
 =: equal to number

If nil, the user will be asked for a match type.")

(defvar gnus-score-default-fold nil
  "Use case folding for new score file entries iff not nil.")

(defvar 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.")

(defvar gnus-score-after-write-file-function nil
  "*Function called with the name of the score file just written to disk.")

\f

;; Internal variables.

(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-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)
    ("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)))

(eval-and-compile
  (autoload 'gnus-uu-ctl-map "gnus-uu" nil nil 'keymap))

;;; Summary mode score maps.

(gnus-define-keys (gnus-summary-score-map "V" gnus-summary-mode-map)
  "s" gnus-summary-set-score
  "a" gnus-summary-score-entry
  "S" gnus-summary-current-score
  "c" gnus-score-change-score-file
  "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
  "C" gnus-score-customize)

;; 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>.

(defun gnus-summary-lower-score (&optional score)
  "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
used as score."
  (interactive "P")
  (gnus-summary-increase-score (- (gnus-score-default score))))

(defvar gnus-score-default-header nil
  "*The default header to score on when entering a score rule interactively.")

(defvar gnus-score-default-type nil
  "*The default score type to use when entering a score rule interactively.")

(defvar gnus-score-default-duration nil
  "*The default score duration to use on when entering a score rule interactively.")

(defun gnus-score-kill-help-buffer ()
  (when (get-buffer "*Score Help*")
    (kill-buffer "*Score Help*")
    (and gnus-score-help-winconf
         (set-window-configuration gnus-score-help-winconf))))

(defun gnus-summary-increase-score (&optional score)
  "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
used as score."
  (interactive "P")
  (gnus-set-global-variables)
  (let* ((nscore (gnus-score-default score))
         (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)
            (?i "message-id" nil t string)
            (?t "references" "message-id" nil string)
            (?x "xref" nil nil string)
            (?l "lines" nil nil number)
            (?d "date" nil nil date)
            (?f "followup" nil nil string)
            (?T "thread" nil nil string)))
         (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 s "regexp string" body-string)
            (?b before "before date" date)
            (?a at "at date" date) 
            (?n now "this date" date)
            (?< < "less than number" number)
            (?> > "greater than number" number) 
            (?= = "equal to number" number)))
         (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)))
         entry temporary type match)
    
    (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))
            (if mimic (error "%c %c" prefix hchar) (error "")))

          (when (/= (downcase hchar) hchar)
            ;; This was a majuscle, 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)))
    
          ;; 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) 
                                    (if (eq (nth 4 entry) 
                                            (nth 3 s))
                                        (char-to-string (car s))
                                      ""))
                                  char-to-type "")))
            (setq tchar (read-char))
            (when (or (= tchar ??) (= tchar ?\C-h))
              (setq tchar nil)
              (gnus-score-insert-help
               "Match type"
               (delq nil
                     (mapcar (lambda (s) 
                               (if (eq (nth 4 entry) 
                                       (nth 3 s))
                                   s nil))
                             char-to-type ))
               2)))

          (gnus-score-kill-help-buffer)
          (unless (setq type (nth 1 (assq (downcase tchar) char-to-type)))
            (if mimic (error "%c %c" prefix hchar) (error "")))

          (when (/= (downcase tchar) tchar)
            ;; It was a majuscle, so we end reading and use the default.
            (if mimic (message "%c %c %c" prefix hchar tchar)
              (message ""))
            (setq pchar (or pchar ?p)))

          ;; 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)
          (if mimic (message "%c %c %c" prefix hchar tchar pchar)
            (message ""))
          (unless (setq temporary (cadr (assq pchar char-to-perm)))
            (if mimic 
                (error "%c %c %c %c" prefix hchar tchar pchar)
              (error ""))))
      ;; Always kill the score help buffer.
      (gnus-score-kill-help-buffer))

    ;; We have all the data, so we enter this score.
    (setq match (if (string= (nth 2 entry) "") ""
                  (gnus-summary-header (or (nth 2 entry) (nth 1 entry)))))
      
    ;; 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)))

    (gnus-summary-score-entry
     (nth 1 entry)                      ; Header
     match                              ; Match
     type                               ; Type
     (if (eq 's score) nil score)       ; Score
     (if (eq 'perm temporary)           ; Temp
         nil
        temporary)
     (not (nth 3 entry)))               ; Prompt
    ))
  
(defun gnus-score-insert-help (string alist idx)
  (setq gnus-score-help-winconf (current-window-configuration))
  (save-excursion
    (set-buffer (get-buffer-create "*Score Help*"))
    (buffer-disable-undo (current-buffer))
    (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))))
        (or (> 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))))
    ;; display ourselves in a small window at the bottom
    (gnus-appt-select-lowest-window)
    (split-window)
    (pop-to-buffer "*Score Help*")
    (let ((window-min-height 1))
      (shrink-window-if-larger-than-buffer))
    (select-window (get-buffer-window gnus-summary-buffer))))
  
(defun gnus-summary-header (header &optional no-err)
  ;; 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))
            (aref headers (nth 1 (assoc header gnus-header-index)))
          (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-get-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 &optional prompt silent)
  "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.
If optional argument `SILENT' is nil, show effect of score entry."
  (interactive
   (list (completing-read "Header: "
                          gnus-header-index
                          (lambda (x) (fboundp (nth 2 x)))
                          t)
         (read-string "Match: ")
         (if (y-or-n-p "Use regexp match? ") 'r 's)
         (and current-prefix-arg
              (prefix-numeric-value current-prefix-arg))
         (cond ((not (y-or-n-p "Add to score file? "))
                'now)
               ((y-or-n-p "Expire kill? ")
                (current-time-string))
               (t nil))))
  ;; Regexp is the default type.
  (if (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))))
  (let ((score (gnus-score-default score))
        (header (format "%s" (downcase header)))
        new)
    (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))))

    ;; Get rid of string props.
    (setq match (format "%s" match))

    ;; If this is an integer comparison, we transform from string to int. 
    (and (eq (nth 2 (assoc header gnus-header-index)) 'gnus-score-integer)
         (setq match (string-to-int match)))

    (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 
               (type (list match score (and date (gnus-day-number date)) type))
               (date (list match score (gnus-day-number date)))
               (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.
          (gnus-score-set header (if old (cons new old) (list new))))
        (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))
          (gnus-summary-score-effect header match type score)
        (gnus-summary-rescore)))

    ;; Return the new scoring rule.
    new))

(defun gnus-summary-score-effect (header match type score)
  "Simulate the effect of a score file entry.
HEADER is the header being scored.
MATCH is the string we are looking for.
TYPE is a flag indicating if it is a regexp or substring.
SCORE is the score to add."
  (interactive (list (completing-read "Header: "
                                      gnus-header-index
                                      (lambda (x) (fboundp (nth 2 x)))
                                      t)
                     (read-string "Match: ")
                     (y-or-n-p "Use regexp match? ")
                     (prefix-numeric-value current-prefix-arg)))
  (save-excursion
    (or (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))
        (let ((content (gnus-summary-header header 'noerr))
              (case-fold-search t))
          (and content
               (if (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)))))

(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)
    (or xref (error "This article is not crossposted"))
    (while (string-match " \\([^ \t]+\\):" xref start)
      (setq start (match-end 0))
      (if (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)))))

\f
;;;
;;; Gnus Score Files
;;;

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

;; Added by Per Abrahamsen <amanda@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))
             (string-to-int (read-string "Mark below: ")))))
  (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))
             (string-to-int (read-string "Set expunge below: ")))))
  (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")
  (setq score (gnus-score-default score))
  (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" (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")
  (setq score (gnus-score-default score))
  (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))))))))

(defun gnus-score-set (symbol value &optional alist)
  ;; 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.
           )
          (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-set-global-variables)
  (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")
  (gnus-set-global-variables)
  (save-excursion
    (gnus-summary-show-thread)
    (let ((buffer-read-only nil))
      ;; Set score.
      (gnus-summary-update-mark
       (if (= n (or gnus-summary-default-score 0)) ? 
         (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)
        (setq gnus-newsgroup-scored
              (cons (cons article n) gnus-newsgroup-scored))))
    (gnus-summary-update-line)))

(defun gnus-summary-current-score ()
  "Return the score of the current article."
  (interactive)
  (gnus-set-global-variables)
  (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))
  (let ((winconf (current-window-configuration)))
    (and (buffer-name gnus-summary-buffer) (gnus-score-save))
    (make-directory (file-name-directory file) t)
    (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")))
  
(defun gnus-score-edit-file (file)
  "Edit a score file."
  (interactive 
   (list (read-file-name "Edit score file: " gnus-kill-files-directory)))
  (make-directory (file-name-directory file) t)
  (and (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")))
  
(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
                          (concat "^" (expand-file-name
                                       gnus-kill-files-directory)) 
                          (expand-file-name file))
                         file)
                    (concat (file-name-as-directory gnus-kill-files-directory)
                            file))))
         (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). 
      (or (assq 'touched alist) (setq alist (cons (list 'touched nil) alist)))
      ;; If it is a global score file, we make it read-only.
      (and global
           (not (assq 'read-only alist))
           (setq alist (cons (list 'read-only t) alist)))
      (setq gnus-score-cache
            (cons (cons file alist) gnus-score-cache)))
    (let ((a alist)
          found)
      (while a
        ;; Downcase all header names.
        (when (stringp (caar a))
          (setcar (car a) (downcase (caar a)))
          (setq found t))
        (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))
          (orphan (car (gnus-score-get 'orphan alist)))
          (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))
          (eval (car (gnus-score-get 'eval alist))))
      ;; We do not respect eval and files atoms from global score
      ;; files. 
      (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)))))
      (and eval (not global) (eval eval))
      ;; We then expand any exclude-file directives.
      (setq gnus-scores-exclude-files 
            (nconc 
             (mapcar 
              (lambda (sfile) 
                (expand-file-name sfile (file-name-directory file)))
              exclude-files) gnus-scores-exclude-files))
      (if (not local)
          ()
        (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)))))
      (if 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
                   ;;(setq gnus-newsgroup-adaptive gnus-use-adaptive-scoring)
                   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)
      (or gnus-score-alist
          (setq gnus-score-alist (copy-alist '((touched nil)))))
      (setq gnus-score-cache
            (cons (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)
  (let (alist)
    (if (not (file-readable-p file))
        (setq gnus-score-alist nil)
      (save-excursion
        (gnus-set-work-buffer)
        (insert-file-contents file)
        (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 
                   (progn
                     (gnus-message 3 "Problem with score file %s" file)
                     (ding) 
                     (sit-for 2)
                     nil))))))
      (if (eq (car alist) 'setq)
          ;; This is an old-style score file.
          (setq gnus-score-alist (gnus-score-transform-old-to-new alist))
        (setq gnus-score-alist alist))
      ;; 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)))
           (format "Illegal score element %s in %s" (car a) file))
          ((stringp (caar a))
           (cond 
            ((not (listp (setq sr (cdar a))))
             (format "Illegal header match %s in %s" (nth 1 (car a)) file))
            (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))))
                  (format "Illegal match %s in %s" (car s) file))
                 ((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)
    (if (eq (car alist) 'quote)
        (setq alist (nth 1 alist)))
    (while alist
      (setq entry (car alist))
      (if (stringp (car entry))
          (let ((scor (cdr entry)))
            (setq out (cons entry out))
            (while scor
              (setcar scor
                      (list (caar scor) (nth 2 (car scor))
                            (and (nth 3 (car scor))
                                 (gnus-day-number (nth 3 (car scor))))
                            (if (nth 1 (car scor)) 'r 's)))
              (setq scor (cdr scor))))
        (setq out (cons (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 "*Score*")
      (while cache
        (current-buffer)
        (setq entry (pop cache)
              file (car entry)
              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))))
            ()
          (setq score (setcdr entry (delq (assq 'touched score) score)))
          (erase-buffer)
          (let (emacs-lisp-mode-hook)
            (if (string-match 
                 (concat (regexp-quote gnus-adaptive-file-suffix)
                         "$") 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.
                (prin1 score (current-buffer))
              ;; This is a normal score file, so we print it very
              ;; prettily. 
              (pp score (current-buffer))))
          (if (and (not (file-exists-p (file-name-directory file)))
                   (make-directory (file-name-directory file) t))
              (gnus-error 1 "Can't create directory %s"
                          (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)
                (write-region (point-min) (point-max) file nil 'silent)
                (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)
               (now (gnus-day-number (current-time-string)))
               (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)
          (gnus-message 5 "Scoring...")
          ;; 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).
            (or (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
            (set-buffer (get-buffer-create "*Headers*"))
            (buffer-disable-undo (current-buffer))

            ;; 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))))
            ;; Remove the buffer.
            (kill-buffer (current-buffer)))

          ;; 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
                (when (listp (caar score))
                  (gnus-score-advanced (car score) trace))
                (pop score))))
                
          (gnus-message 5 "Scoring...done"))))))


(defun gnus-get-new-thread-ids (articles)
  (let ((index (nth 1 (assoc "message-id" gnus-header-index)))
        (refind gnus-score-index)
        id-list art this tref)
    (while articles
      (setq art (car articles)
            this (aref (car art) index)
            tref (aref (car art) refind)
            articles (cdr articles))
      (if (string-equal tref "")        ;no references line
          (setq id-list (cons this id-list))))
    id-list))

;; Orphan functions written by plm@atcmp.nl (Peter Mutsaers).
(defun gnus-score-orphans (score)
  (let ((new-thread-ids (gnus-get-new-thread-ids gnus-scores-articles))
        alike articles art arts this last this-id)
    
    (setq gnus-scores-articles (sort gnus-scores-articles 'gnus-score-string<)
          articles gnus-scores-articles)

    ;;more or less the same as in gnus-score-string
    (erase-buffer)
    (while articles
      (setq art (car articles)
            this (aref (car art) gnus-score-index)
            articles (cdr articles))
      ;;completely skip if this is empty (not a child, so not an orphan)
      (if (not (string= this ""))
          (if (equal last this)
              ;; O(N*H) cons-cells used here, where H is the number of
              ;; headers.
              (setq alike (cons art alike))
            (if last
                (progn
                  ;; Insert the line, with a text property on the
                  ;; terminating newline referring to the articles with
                  ;; this line.
                  (insert last ?\n)
                  (put-text-property (1- (point)) (point) 'articles alike)))
            (setq alike (list art)
                  last this))))
    (and last                           ; Bwadr, duplicate code.
         (progn
           (insert last ?\n)                    
           (put-text-property (1- (point)) (point) 'articles alike)))

    ;; PLM: now delete those lines that contain an entry from new-thread-ids
    (while new-thread-ids
      (setq this-id (car new-thread-ids)
            new-thread-ids (cdr new-thread-ids))
      (goto-char (point-min))
      (while (search-forward this-id nil t)
        ;; found a match. remove this line
        (beginning-of-line)
        (kill-line 1)))

    ;; now for each line: update its articles with score by moving to
    ;; every end-of-line in the buffer and read the articles property
    (goto-char (point-min))
    (while (eq 0 (progn
                   (end-of-line)
                   (setq arts (get-text-property (point) 'articles))
                   (while arts
                     (setq art (car arts)
                           arts (cdr arts))
                     (setcdr art (+ score (cdr art))))
                   (forward-line))))))
             

(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
                             (error "Illegal match type: %s" type)))
               (articles gnus-scores-articles))
          ;; Instead of doing all the clever stuff that
          ;; `gnus-score-string' does to minimize searches and stuff,
          ;; I will assume that people generally will put so few
          ;; matches on numbers that any cleverness will take more
          ;; time than one would gain.
          (while articles
            (when (funcall match-func 
                          (or (aref (caar articles) gnus-score-index) 0)
                          match)
              (when trace 
                (push (cons (car-safe (rassq alist gnus-score-cache)) kill)
                      gnus-score-trace))
              (setq found t)
              (setcdr (car articles) (+ score (cdar articles))))
            (setq articles (cdr articles)))
          ;; Update expire date
          (cond ((null date))           ;Permanent entry.
                ((and found gnus-update-score-entry-dates) ;Match, update date.
                 (gnus-score-set 'touched '(t) alist)
                 (setcar (nthcdr 2 kill) now))
                ((and expire (< date expire)) ;Old entry, remove.
                 (gnus-score-set 'touched '(t) alist)
                 (setcdr entries (cdr rest))
                 (setq rest entries)))
          (setq entries rest)))))
  nil)

(defun gnus-score-date (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 (timezone-make-date-sortable (nth 0 kill)))
               (type (or (nth 3 kill) 'before))
               (score (or (nth 1 kill) gnus-score-interactive-default-score))
               (date (nth 2 kill))
               (found nil)
               (match-func 
                (cond ((eq type 'after) 'string<)
                      ((eq type 'before) 'gnus-string>)
                      ((eq type 'at) 'string=)
                      (t (error "Illegal match type: %s" type))))
               (articles gnus-scores-articles)
               l)
          ;; Instead of doing all the clever stuff that
          ;; `gnus-score-string' does to minimize searches and stuff,
          ;; I will assume that people generally will put so few
          ;; matches on numbers that any cleverness will take more
          ;; time than one would gain.
          (while articles
            (and
             (setq l (aref (caar articles) gnus-score-index))
             (funcall match-func match (timezone-make-date-sortable l))
             (progn
               (and trace (setq gnus-score-trace 
                                (cons
                                 (cons
                                  (car-safe (rassq alist gnus-score-cache))
                                  kill)
                                 gnus-score-trace)))
               (setq found t)
               (setcdr (car articles) (+ score (cdar articles)))))
            (setq articles (cdr articles)))
          ;; Update expire date
          (cond ((null date))           ;Permanent entry.
                ((and found gnus-update-score-entry-dates) ;Match, update date.
                 (gnus-score-set 'touched '(t) alist)
                 (setcar (nthcdr 2 kill) now))
                ((and expire (< date expire))   ;Old entry, remove.
                 (gnus-score-set 'touched '(t) alist)
                 (setcdr entries (cdr rest))
                 (setq rest entries)))
          (setq entries rest)))))
  nil)

(defun gnus-score-body (scores header now expire &optional trace)
  (save-excursion
    (set-buffer nntp-server-buffer)
    (setq gnus-scores-articles
          (sort gnus-scores-articles
                (lambda (a1 a2)
                  (< (mail-header-number (car a1))
                     (mail-header-number (car a2))))))
    (save-restriction
      (let* ((buffer-read-only nil)
             (articles gnus-scores-articles)
             (all-scores scores)
             (request-func (cond ((string= "head" header)
                                  'gnus-request-head)
                                 ((string= "body" header)
                                  'gnus-request-body)
                                 (t 'gnus-request-article)))
             entries alist ofunc article last)
        (when articles
          (setq last (mail-header-number (caar (last articles))))
          ;; Not all backends support partial fetching.  In that case,
          ;; we just fetch the entire article.
          (unless (gnus-check-backend-function 
                   (and (string-match "^gnus-" (symbol-name request-func))
                        (intern (substring (symbol-name request-func)
                                           (match-end 0))))
                   gnus-newsgroup-name)
            (setq ofunc request-func)
            (setq request-func 'gnus-request-article))
          (while articles
            (setq article (mail-header-number (caar articles)))
            (gnus-message 7 "Scoring on article %s of %s..." article last)
            (when (funcall request-func article gnus-newsgroup-name)
              (widen)
              (goto-char (point-min))
              ;; If just parts of the article is to be searched, but the
              ;; backend didn't support partial fetching, we just narrow
              ;; to the relevant parts.
              (if ofunc
                  (if (eq ofunc 'gnus-request-head)
                      (narrow-to-region
                       (point)
                       (or (search-forward "\n\n" nil t) (point-max)))
                    (narrow-to-region
                     (or (search-forward "\n\n" nil t) (point))
                     (point-max))))
              (setq scores all-scores)
              ;; 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) 's))
                         (score (or (nth 1 kill) 
                                    gnus-score-interactive-default-score))
                         (date (nth 2 kill))
                         (found nil)
                         (case-fold-search 
                          (not (or (eq type 'R) (eq type 'S)
                                   (eq type 'Regexp) (eq type 'String))))
                         (search-func 
                          (cond ((or (eq type 'r) (eq type 'R)
                                     (eq type 'regexp) (eq type 'Regexp))
                                 're-search-forward)
                                ((or (eq type 's) (eq type 'S)
                                     (eq type 'string) (eq type 'String))
                                 'search-forward)
                                (t
                                 (error "Illegal match type: %s" type)))))
                    (goto-char (point-min))
                    (if (funcall search-func match nil t)
                        ;; Found a match, update scores.
                        (progn
                          (setcdr (car articles) (+ score (cdar articles)))
                          (setq found t)
                          (and trace (setq gnus-score-trace 
                                           (cons
                                            (cons
                                             (car-safe
                                              (rassq alist gnus-score-cache))
                                             kill)
                                            gnus-score-trace)))))
                    ;; Update expire date
                    (cond
                     ((null date))      ;Permanent entry.
                     ((and found gnus-update-score-entry-dates) ;Match, update date.
                      (gnus-score-set 'touched '(t) alist)
                      (setcar (nthcdr 2 kill) now))
                     ((and expire (< date expire)) ;Old entry, remove.
                      (gnus-score-set 'touched '(t) alist)
                      (setcdr entries (cdr rest))
                      (setq rest entries)))
                    (setq entries rest)))))
            (setq articles (cdr articles)))))))
  nil)

(defun gnus-score-followup (scores header now expire &optional trace thread)
  ;; Insert the unique article headers in the buffer.
  (let ((gnus-score-index (nth 1 (assoc header gnus-header-index)))
        (current-score-file gnus-current-score-file)
        (all-scores scores)
        ;; gnus-score-index is used as a free variable.
        alike last this art entries alist articles
        new news)

    ;; Change score file to the adaptive score file.  All entries that
    ;; this function makes will be put into this file.
    (save-excursion
      (set-buffer gnus-summary-buffer)
      (gnus-score-load-file
       (or gnus-newsgroup-adaptive-score-file
           (gnus-score-file-name 
            gnus-newsgroup-name gnus-adaptive-file-suffix))))

    (setq gnus-scores-articles (sort gnus-scores-articles 'gnus-score-string<)
          articles gnus-scores-articles)

    (erase-buffer)
    (while articles
      (setq art (car articles)
            this (aref (car art) gnus-score-index)
            articles (cdr articles))
      (if (equal last this)
          (setq alike (cons art alike))
        (if last
            (progn
              (insert last ?\n)
              (put-text-property (1- (point)) (point) 'articles alike)))
        (setq alike (list art)
              last this)))
    (and last                           ; Bwadr, duplicate code.
         (progn
           (insert last ?\n)                    
           (put-text-property (1- (point)) (point) 'articles alike)))
  
    ;; 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) 's))
               (score (or (nth 1 kill) gnus-score-interactive-default-score))
               (date (nth 2 kill))
               (found nil)
               (mt (aref (symbol-name type) 0))
               (case-fold-search 
                (not (or (= mt ?R) (= mt ?S) (= mt ?E) (= mt ?F))))
               (dmt (downcase mt))
               (search-func 
                (cond ((= dmt ?r) 're-search-forward)
                      ((or (= dmt ?e) (= dmt ?s) (= dmt ?f)) 'search-forward)
                      (t (error "Illegal match type: %s" type))))
               arts art)
          (goto-char (point-min))
          (if (= dmt ?e)
              (while (funcall search-func match nil t)
                (and (= (progn (beginning-of-line) (point))
                        (match-beginning 0))
                     (= (progn (end-of-line) (point))
                        (match-end 0))
                     (progn
                       (setq found (setq arts (get-text-property 
                                               (point) 'articles)))
                       ;; Found a match, update scores.
                       (while arts
                         (setq art (car arts)
                               arts (cdr arts))
                         (gnus-score-add-followups 
                          (car art) score all-scores thread))))
                (end-of-line))
            (while (funcall search-func match nil t)
              (end-of-line)
              (setq found (setq arts (get-text-property (point) 'articles)))
              ;; Found a match, update scores.
              (while (setq art (pop arts))
                (when (setq new (gnus-score-add-followups
                                 (car art) score all-scores thread))
                  (push new news)))))
          ;; Update expire date
          (cond ((null date))           ;Permanent entry.
                ((and found gnus-update-score-entry-dates) ;Match, update date.
                 (gnus-score-set 'touched '(t) alist)
                 (setcar (nthcdr 2 kill) now))
                ((and expire (< date expire))   ;Old entry, remove.
                 (gnus-score-set 'touched '(t) alist)
                 (setcdr entries (cdr rest))
                 (setq rest entries)))
          (setq entries rest))))
    ;; We change the score file back to the previous one.
    (save-excursion
      (set-buffer gnus-summary-buffer)
      (gnus-score-load-file current-score-file))
    (list (cons "references" news))))

(defun gnus-score-add-followups (header score scores &optional thread)
  "Add a score entry to the adapt file."
  (save-excursion
    (set-buffer gnus-summary-buffer)
    (let* ((id (mail-header-id header))
           (scores (car scores))
           entry dont)
      ;; Don't enter a score if there already is one.
      (while (setq entry (pop scores))
        (and (equal "references" (car entry))
             (or (null (nth 3 (cadr entry)))
                 (eq 's (nth 3 (cadr entry))))
             (assoc id entry)
             (setq dont t)))
      (unless dont
        (gnus-summary-score-entry 
         (if thread "thread" "references")
         id 's score (current-time-string) nil t)))))

(defun gnus-score-string (score-list header now expire &optional trace)
  ;; Score ARTICLES according to HEADER in SCORE-LIST.
  ;; Update matching entries to NOW and remove unmatched entries older
  ;; than EXPIRE.
  
  ;; Insert the unique article headers in the buffer.
  (let ((gnus-score-index (nth 1 (assoc header gnus-header-index)))
        ;; gnus-score-index is used as a free variable.
        alike last this art entries alist articles scores 
        fuzzies arts words kill)

    ;; Sorting the articles costs os O(N*log N) but will allow us to
    ;; only match with each unique header.  Thus the actual matching
    ;; will be O(M*U) where M is the number of strings to match with,
    ;; and U is the number of unique headers.  It is assumed (but
    ;; untested) this will be a net win because of the large constant
    ;; factor involved with string matching.
    (setq gnus-scores-articles (sort gnus-scores-articles 'gnus-score-string<)
          articles gnus-scores-articles)

    (erase-buffer)
    (while (setq art (pop articles))
      (setq this (aref (car art) gnus-score-index))
      (if (equal last this)
          ;; O(N*H) cons-cells used here, where H is the number of
          ;; headers.
          (setq alike (cons art alike))
        (when last
          ;; Insert the line, with a text property on the
          ;; terminating newline referring to the articles with
          ;; this line.
          (insert last ?\n)
          (put-text-property (1- (point)) (point) 'articles alike))
        (setq alike (list art)
              last this)))
    (when last                          ; Bwadr, duplicate code.
      (insert last ?\n)                 
      (put-text-property (1- (point)) (point) 'articles alike))

    ;; Go through all the score alists and pick out the entries
    ;; for this header.
    (while score-list
      (setq alist (pop score-list)
            ;; There's only one instance of this header for
            ;; each score alist.
            entries (assoc header alist))
      (while (cdr entries)              ;First entry is the header index.
        (let* ((kill (cadr entries))
               (match (nth 0 kill))
               (type (or (nth 3 kill) 's))
               (score (or (nth 1 kill) gnus-score-interactive-default-score))
               (date (nth 2 kill))
               (found nil)
               (mt (aref (symbol-name type) 0))
               (case-fold-search (not (memq mt '(?R ?S ?E ?F))))
               (dmt (downcase mt))
               (search-func 
                (cond ((= dmt ?r) 're-search-forward)
                      ((or (= dmt ?e) (= dmt ?s) (= dmt ?f)) 'search-forward)
                      (t (error "Illegal match type: %s" type)))))
          (cond
           ;; Fuzzy matches.  We save these for later.
           ((= dmt ?f)
            (push entries fuzzies))
           ;; Word matches.  Save these for even later.
           ((= dmt ?w)
            (push entries words))
           ;; Exact matches.
           ((= dmt ?e)
            ;; Do exact matching.
            (goto-char (point-min))
            (while (and (not (eobp)) 
                        (funcall search-func match nil t))
              ;; Is it really exact?
              (and (eolp)
                   (= (gnus-point-at-bol) (match-beginning 0))
                   ;; Yup.
                   (progn
                     (setq found (setq arts (get-text-property 
                                             (point) 'articles)))
                     ;; Found a match, update scores.
                     (if trace
                         (while (setq art (pop arts))
                           (setcdr art (+ score (cdr art)))
                           (setq gnus-score-trace
                                 (cons
                                  (cons
                                   (car-safe
                                    (rassq alist gnus-score-cache))
                                   kill)
                                  gnus-score-trace)))
                       (while (setq art (pop arts))
                         (setcdr art (+ score (cdr art)))))))
              (forward-line 1)))
           ;; Regexp and substring matching.
           (t
            (goto-char (point-min))
            (when (string= match "")
              (setq match "\n"))
            (while (and (not (eobp))
                        (funcall search-func match nil t))
              (goto-char (match-beginning 0))
              (end-of-line)
              (setq found (setq arts (get-text-property (point) 'articles)))
              ;; Found a match, update scores.
              (if trace
                  (while (setq art (pop arts))
                    (setcdr art (+ score (cdr art)))
                    (push (cons (car-safe (rassq alist gnus-score-cache)) kill)
                          gnus-score-trace))
                (while (setq art (pop arts))
                  (setcdr art (+ score (cdr art)))))
              (forward-line 1))))
          ;; Update expiry date
          (if trace
              (setq entries (cdr entries))
            (cond 
             ;; Permanent entry.
             ((null date)
              (setq entries (cdr entries)))
             ;; We have a match, so we update the date.
             ((and found gnus-update-score-entry-dates)
              (gnus-score-set 'touched '(t) alist)
              (setcar (nthcdr 2 kill) now)
              (setq entries (cdr entries)))
             ;; This entry has expired, so we remove it.
             ((and expire (< date expire))
              (gnus-score-set 'touched '(t) alist)
              (setcdr entries (cddr entries)))
             ;; No match; go to next entry.
             (t
              (setq entries (cdr entries))))))))

    ;; Find fuzzy matches.
    (when fuzzies
      ;; Simplify the entire buffer for easy matching.
      (gnus-simplify-buffer-fuzzy)
      (while (setq kill (cadar fuzzies))
        (let* ((match (nth 0 kill))
               (type (nth 3 kill))
               (score (or (nth 1 kill) gnus-score-interactive-default-score))
               (date (nth 2 kill))
               (mt (aref (symbol-name type) 0))
               (case-fold-search (not (= mt ?F)))
               found)
          (goto-char (point-min))
          (while (and (not (eobp)) 
                      (search-forward match nil t))
            (when (and (= (gnus-point-at-bol) (match-beginning 0))
                       (eolp))
              (setq found (setq arts (get-text-property (point) 'articles)))
              (if trace
                  (while (setq art (pop arts))
                    (setcdr art (+ score (cdr art)))
                    (push (cons
                           (car-safe (rassq alist gnus-score-cache)) kill)
                          gnus-score-trace))
                ;; Found a match, update scores.
                (while (setq art (pop arts))
                  (setcdr art (+ score (cdr art))))))
            (forward-line 1))
          ;; Update expiry date
          (cond
           ;; Permanent.
           ((null date)
            )
           ;; Match, update date.
           ((and found gnus-update-score-entry-dates)
            (gnus-score-set 'touched '(t) alist)
            (setcar (nthcdr 2 kill) now))
           ;; Old entry, remove.
           ((and expire (< date expire)) 
            (gnus-score-set 'touched '(t) alist)
            (setcdr (car fuzzies) (cddar fuzzies))))
          (setq fuzzies (cdr fuzzies)))))

    (when words
      ;; Enter all words into the hashtb.
      (let ((hashtb (gnus-make-hashtable
                     (* 10 (count-lines (point-min) (point-max))))))
        (gnus-enter-score-words-into-hashtb hashtb)
        (while (setq kill (cadar words))
          (let* ((score (or (nth 1 kill) gnus-score-interactive-default-score))
                 (date (nth 2 kill))
                 found)
            (when (setq arts (intern-soft (nth 0 kill) hashtb))
              (setq found t)
              (if trace
                  (while (setq art (pop arts))
                    (setcdr art (+ score (cdr art)))
                    (push (cons
                           (car-safe (rassq alist gnus-score-cache)) kill)
                          gnus-score-trace))
                ;; Found a match, update scores.
                (while (setq art (pop arts))
                  (setcdr art (+ score (cdr art))))))
            ;; Update expiry date
            (cond
             ;; Permanent.
             ((null date)
              )
             ;; Match, update date.
             ((and found gnus-update-score-entry-dates)
              (gnus-score-set 'touched '(t) alist)
              (setcar (nthcdr 2 kill) now))
             ;; Old entry, remove.
             ((and expire (< date expire)) 
              (gnus-score-set 'touched '(t) alist)
              (setcdr (car words) (cddar words))))
            (setq fuzzies (cdr fuzzies))))))
    nil))

(defun gnus-enter-score-words-into-hashtb (hashtb)
  ;; Find all the words in the buffer and enter them into
  ;; the hashtable.
  (let (word)
    (goto-char (point-min))
    (while (re-search-forward "\\b\\w+\\b" nil t)
      (gnus-sethash
       (setq word (downcase (buffer-substring
                             (match-beginning 0) (match-end 0))))
       (append (get-text-property (gnus-point-at-eol) 'articles)
               (gnus-gethash word hashtb))
       hashtb))
    ;; Make all the ignorable words ignored.
    (let ((ignored gnus-ignored-adaptive-words))
      (while ignored
        (gnus-sethash (pop ignored) nil hashtb)))))

(defun gnus-score-string< (a1 a2)
  ;; Compare headers in articles A2 and A2.
  ;; The header index used is the free variable `gnus-score-index'.
  (string-lessp (aref (car a1) gnus-score-index)
                (aref (car a2) gnus-score-index)))

(defun gnus-current-score-file-nondirectory (&optional score-file)
  (let ((score-file (or score-file gnus-current-score-file)))
    (if score-file 
        (gnus-short-group-name (file-name-nondirectory score-file))
      "none")))

(defun gnus-score-adaptive ()
  "Create adaptive score rules for this newsgroup."
  (when gnus-use-adaptive-scoring
    ;; We change the score file to the adaptive score file.
    (save-excursion
      (set-buffer gnus-summary-buffer)
      (gnus-score-load-file 
       (or gnus-newsgroup-adaptive-score-file
           (gnus-score-file-name 
            gnus-newsgroup-name gnus-adaptive-file-suffix))))
    (cond
     ;; Perform ordinary line scoring.
     ((or (not (listp gnus-use-adaptive-scoring))
          (memq 'line gnus-use-adaptive-scoring))
      (save-excursion
        (let* ((malist (gnus-copy-sequence gnus-adaptive-score-alist))
               (alist malist)
               (date (current-time-string)) 
               (data gnus-newsgroup-data)
               elem headers match)
          ;; First we transform the adaptive rule alist into something
          ;; that's faster to process.
          (while malist
            (setq elem (car malist))
            (if (symbolp (car elem))
                (setcar elem (symbol-value (car elem))))
            (setq elem (cdr elem))
            (while elem
              (setcdr (car elem) 
                      (cons (if (eq (caar elem) 'followup)
                                "references"
                              (symbol-name (caar elem)))
                            (cdar elem)))
              (setcar (car elem) 
                      `(lambda (h)
                         (,(intern 
                            (concat "mail-header-" 
                                    (if (eq (caar elem) 'followup)
                                        "message-id"
                                      (downcase (symbol-name (caar elem))))))
                          h)))
              (setq elem (cdr elem)))
            (setq malist (cdr malist)))
          ;; Then we score away.
          (while data
            (setq elem (cdr (assq (gnus-data-mark (car data)) alist)))
            (if (or (not elem)
                    (gnus-data-pseudo-p (car data)))
                ()
              (when (setq headers (gnus-data-header (car data)))
                (while elem 
                  (setq match (funcall (caar elem) headers))
                  (gnus-summary-score-entry 
                   (nth 1 (car elem)) match
                   (cond
                    ((numberp match)
                     '=)
                    ((equal (nth 1 (car elem)) "date")
                     'a)
                    (t
                     ;; Whether we use substring or exact matches is
                     ;; controlled here.  
                     (if (or (not gnus-score-exact-adapt-limit)
                             (< (length match) gnus-score-exact-adapt-limit))
                         'e 
                       (if (equal (nth 1 (car elem)) "subject")
                           'f 's))))
                   (nth 2 (car elem)) date nil t)
                  (setq elem (cdr elem)))))
            (setq data (cdr data))))))

     ;; Perform adaptive word scoring.
     ((memq 'word gnus-use-adaptive-scoring)
      (nnheader-temp-write nil
        (let* ((hashtb (gnus-make-hashtable 1000))
               (date (current-time-string))
               (data gnus-newsgroup-data)
               word d score)
          ;; Go through all articles.
          (while (setq d (pop data))
            (when (setq score (cdr (assq 
                                    (gnus-data-mark d)
                                    gnus-default-adaptive-word-score-alist)))
              ;; This article has a mark that should lead to
              ;; adaptive word rules, so we insert the subject
              ;; and find all words in that string.
              (insert (mail-header-subject (gnus-data-header d)))
              (downcase-region (point-min) (point-max))
              (goto-char (point-min))
              (while (re-search-forward "\\b\\w+\\b" nil t)
                ;; Put the word and score into the hashtb.
                (gnus-sethash (setq word (match-string 0))
                              (+ (or (gnus-gethash word hashtb) 0) score)
                              hashtb))
              (erase-buffer)))
          ;; Make all the ignorable words ignored.
          (let ((ignored gnus-ignored-adaptive-words))
            (while ignored
              (gnus-sethash (pop ignored) nil hashtb)))
          ;; Now we have all the words and scores, so we
          ;; add these rules to the ADAPT file.
          (mapatoms
           (lambda (word)
             (gnus-summary-score-entry
              "subject" (symbol-name word) 'w (symbol-value word)
              date))
           hashtb)))))))

(defun gnus-score-edit-done ()
  (let ((bufnam (buffer-file-name (current-buffer)))
        (winconf gnus-prev-winconf))
    (and winconf (set-window-configuration winconf))
    (gnus-score-remove-from-cache bufnam)
    (gnus-score-load-file bufnam)))

(defun gnus-score-find-trace ()
  "Find all score rules that applies to the current article."
  (interactive)
  (let ((gnus-newsgroup-headers
         (list (gnus-summary-article-header)))
        (gnus-newsgroup-scored nil)
        trace)
    (save-excursion
      (nnheader-set-temp-buffer "*Score Trace*"))
    (setq gnus-score-trace nil)
    (gnus-possibly-score-headers 'trace)
    (if (not (setq trace gnus-score-trace))
        (gnus-error 1 "No score rules apply to the current article.")
      (set-buffer "*Score Trace*")
      (gnus-add-current-to-buffer-list)
      (while trace
        (insert (format "%S  ->  %s\n" (cdar trace)
                        (file-name-nondirectory (caar trace))))
        (setq trace (cdr trace)))
      (goto-char (point-min))
      (gnus-configure-windows 'score-trace))))

(defun gnus-score-find-favourite-words ()
  "List words used in scoring."
  (interactive)
  (let ((alists (gnus-score-load-files (gnus-all-score-files)))
        alist rule rules)
    ;; Go through all the score alists for this group
    ;; and find all `w' rules.
    (while (setq alist (pop alists))
      (when (and (stringp (setq rule (pop alist)))
                 (equal "subject" (downcase (pop rule))))
        (while rule
          (when (memq (nth 3 (car rule)) '(w W word Word))
            (push (cons (or (nth 1 rule) gnus-score-interactive-default-score)
                        (car rule))
                  rules))
          (pop rule))))
    (setq rules (sort rules (lambda (r1 r2)
                              (string-lessp (cdr r1) (cdr r2)))))
    ;; Add up words that have appeared several times.
    (let ((r rules))
      (while (cdr r)
        (if (equal (cdar r) (cdadr r))
            (progn
              (setcar (car r) (+ (caar r) (caadr r)))
              (setcdr r (cddr r)))
          (pop r))))
    ;; Insert the words.
    (nnheader-set-temp-buffer "*Score Words*")
    (setq rules (sort rules (lambda (r1 r2) (> (car r1) (car r2)))))
    (while rules
      (insert (format "%-5d: %s\n" (caar rules) (cdar rules)))
      (pop rules))
    (gnus-add-current-to-buffer-list)
    (gnus-configure-windows 'score-words)))

(defun gnus-summary-rescore ()
  "Redo the entire scoring process in the current summary."
  (interactive)
  (gnus-score-save)
  (setq gnus-score-cache nil)
  (setq gnus-newsgroup-scored nil)
  (gnus-possibly-score-headers)
  (gnus-score-update-all-lines))
  
(defun gnus-score-flush-cache ()
  "Flush the cache of score files."
  (interactive)
  (gnus-score-save)
  (setq gnus-score-cache nil
        gnus-score-alist nil
        gnus-short-name-score-file-cache nil)
  (gnus-message 6 "The score cache is now flushed"))

(gnus-add-shutdown 'gnus-score-close 'gnus)

(defvar gnus-score-file-alist-cache nil)

(defun gnus-score-close ()
  "Clear all internal score variables."
  (setq gnus-score-cache nil
        gnus-internal-global-score-files nil
        gnus-score-file-list nil
        gnus-score-file-alist-cache nil))

;; Summary score marking commands.

(defun gnus-summary-raise-same-subject-and-select (score)
  "Raise articles which has the same subject with SCORE and select the next."
  (interactive "p")
  (let ((subject (gnus-summary-article-subject)))
    (gnus-summary-raise-score score)
    (while (gnus-summary-find-subject subject)
      (gnus-summary-raise-score score))
    (gnus-summary-next-article t)))

(defun gnus-summary-raise-same-subject (score)
  "Raise articles which has the same subject with SCORE."
  (interactive "p")
  (let ((subject (gnus-summary-article-subject)))
    (gnus-summary-raise-score score)
    (while (gnus-summary-find-subject subject)
      (gnus-summary-raise-score score))
    (gnus-summary-next-subject 1 t)))

(defun gnus-score-default (level)
  (if level (prefix-numeric-value level) 
    gnus-score-interactive-default-score))

(defun gnus-summary-raise-thread (&optional score)
  "Raise the score of the articles in the current thread with SCORE."
  (interactive "P")
  (setq score (gnus-score-default score))
  (let (e)
    (save-excursion
      (let ((articles (gnus-summary-articles-in-thread)))
        (while articles
          (gnus-summary-goto-subject (car articles))
          (gnus-summary-raise-score score)
          (setq articles (cdr articles))))
      (setq e (point)))
    (let ((gnus-summary-check-current t))
      (or (zerop (gnus-summary-next-subject 1 t))
          (goto-char e))))
  (gnus-summary-recenter)
  (gnus-summary-position-point)
  (gnus-set-mode-line 'summary))

(defun gnus-summary-lower-same-subject-and-select (score)
  "Raise articles which has the same subject with SCORE and select the next."
  (interactive "p")
  (gnus-summary-raise-same-subject-and-select (- score)))

(defun gnus-summary-lower-same-subject (score)
  "Raise articles which has the same subject with SCORE."
  (interactive "p")
  (gnus-summary-raise-same-subject (- score)))

(defun gnus-summary-lower-thread (&optional score)
  "Lower score of articles in the current thread with SCORE."
  (interactive "P")
  (gnus-summary-raise-thread (- (1- (gnus-score-default score)))))

;;; Finding score files. 

(defun gnus-score-score-files (group)
  "Return a list of all possible score files."
  ;; Search and set any global score files.
  (and gnus-global-score-files 
       (or gnus-internal-global-score-files
           (gnus-score-search-global-directories gnus-global-score-files)))
  ;; Fix the kill-file dir variable.
  (setq gnus-kill-files-directory 
        (file-name-as-directory gnus-kill-files-directory))
  ;; If we can't read it, there are no score files.
  (if (not (file-exists-p (expand-file-name gnus-kill-files-directory)))
      (setq gnus-score-file-list nil)
    (if (not (gnus-use-long-file-name 'not-score))
        ;; We do not use long file names, so we have to do some
        ;; directory traversing.  
        (setq gnus-score-file-list 
              (cons nil 
                    (or gnus-short-name-score-file-cache
                        (prog2
                            (gnus-message 6 "Finding all score files...")
                            (setq gnus-short-name-score-file-cache
                                  (gnus-score-score-files-1
                                   gnus-kill-files-directory))
                          (gnus-message 6 "Finding all score files...done")))))
      ;; We want long file names.
      (when (or (not gnus-score-file-list)
                (not (car gnus-score-file-list))
                (gnus-file-newer-than gnus-kill-files-directory
                                      (car gnus-score-file-list)))
        (setq gnus-score-file-list 
              (cons (nth 5 (file-attributes gnus-kill-files-directory))
                    (nreverse 
                     (directory-files 
                      gnus-kill-files-directory t 
                      (gnus-score-file-regexp)))))))
    (cdr gnus-score-file-list)))

(defun gnus-score-score-files-1 (dir)
  "Return all possible score files under DIR."
  (let ((files (directory-files (expand-file-name dir) t nil t))
        (regexp (gnus-score-file-regexp))
        out file)
    (while (setq file (pop files))
      (cond 
       ;; Ignore "." and "..".
       ((member (file-name-nondirectory file) '("." ".."))
        nil)
       ;; Recurse down directories.
       ((file-directory-p file)
        (setq out (nconc (gnus-score-score-files-1 file) out)))
       ;; Add files to the list of score files.
       ((string-match regexp file)
        (push file out))))
    (or out
        ;; Return a dummy value.
        (list "~/News/this.file.does.not.exist.SCORE"))))
       
(defun gnus-score-file-regexp ()
  "Return a regexp that match all score files."
  (concat "\\(" (regexp-quote gnus-score-file-suffix )
          "\\|" (regexp-quote gnus-adaptive-file-suffix) "\\)\\'"))
        
(defun gnus-score-find-bnews (group)
  "Return a list of score files for GROUP.
The score files are those files in the ~/News/ directory which matches
GROUP using BNews sys file syntax."
  (let* ((sfiles (append (gnus-score-score-files group)
                         gnus-internal-global-score-files))
         (kill-dir (file-name-as-directory 
                    (expand-file-name gnus-kill-files-directory)))
         (klen (length kill-dir))
         (score-regexp (gnus-score-file-regexp))
         (trans (cdr (assq ?: nnheader-file-name-translation-alist)))
         ofiles not-match regexp)
    (save-excursion
      (set-buffer (get-buffer-create "*gnus score files*"))
      (buffer-disable-undo (current-buffer))
      ;; Go through all score file names and create regexp with them
      ;; as the source.  
      (while sfiles
        (erase-buffer)
        (insert (car sfiles))
        (goto-char (point-min))
        ;; First remove the suffix itself.
        (when (re-search-forward (concat "." score-regexp) nil t)
          (replace-match "" t t) 
          (goto-char (point-min))
          (if (looking-at (regexp-quote kill-dir))
              ;; If the file name was just "SCORE", `klen' is one character
              ;; too much.
              (delete-char (min (1- (point-max)) klen))
            (goto-char (point-max))
            (search-backward "/")
            (delete-region (1+ (point)) (point-min)))
          ;; If short file names were used, we have to translate slashes.
          (goto-char (point-min))
          (let ((regexp (concat
                         "[/:" (if trans (char-to-string trans) "") "]")))
            (while (re-search-forward regexp nil t)
              (replace-match "." t t)))
          ;; Cludge to get rid of "nntp+" problems.
          (goto-char (point-min))
          (and (looking-at "nn[a-z]+\\+")
               (progn
                 (search-forward "+")
                 (forward-char -1)
                 (insert "\\")))
          ;; Kludge to deal with "++".
          (goto-char (point-min))
          (while (search-forward "++" nil t)
            (replace-match "\\+\\+" t t))
          ;; Translate "all" to ".*".
          (goto-char (point-min))
          (while (search-forward "all" nil t)
            (replace-match ".*" t t))
          (goto-char (point-min))
          ;; Deal with "not."s.
          (if (looking-at "not.")
              (progn
                (setq not-match t)
                (setq regexp (buffer-substring 5 (point-max))))
            (setq regexp (buffer-substring 1 (point-max)))
            (setq not-match nil))
          ;; Finally - if this resulting regexp matches the group name,
          ;; we add this score file to the list of score files
          ;; applicable to this group.
          (if (or (and not-match
                       (not (string-match regexp group)))
                  (and (not not-match)
                       (string-match regexp group)))
              (setq ofiles (cons (car sfiles) ofiles))))
        (setq sfiles (cdr sfiles)))
      (kill-buffer (current-buffer))
      ;; Slight kludge here - the last score file returned should be
      ;; the local score file, whether it exists or not. This is so
      ;; that any score commands the user enters will go to the right
      ;; file, and not end up in some global score file.
      (let ((localscore (gnus-score-file-name group)))
        (setq ofiles (cons localscore (delete localscore ofiles))))
      (nreverse ofiles))))

(defun gnus-score-find-single (group)
  "Return list containing the score file for GROUP."
  (list (or gnus-newsgroup-adaptive-score-file
            (gnus-score-file-name group gnus-adaptive-file-suffix))
        (gnus-score-file-name group)))

(defun gnus-score-find-hierarchical (group)
  "Return list of score files for GROUP.
This includes the score file for the group and all its parents."
  (let ((all (copy-sequence '(nil)))
        (start 0))
    (while (string-match "\\." group (1+ start))
      (setq start (match-beginning 0))
      (setq all (cons (substring group 0 start) all)))
    (setq all (cons group all))
    (nconc
     (mapcar (lambda (newsgroup)
               (gnus-score-file-name newsgroup gnus-adaptive-file-suffix))
             (setq all (nreverse all)))
     (mapcar 'gnus-score-file-name all))))

(defun gnus-score-find-alist (group)
  "Return list of score files for GROUP.
The list is determined from the variable gnus-score-file-alist."
  (let ((alist gnus-score-file-multiple-match-alist)
        score-files)
    ;; if this group has been seen before, return the cached entry
    (if (setq score-files (assoc group gnus-score-file-alist-cache))
        (cdr score-files)               ;ensures caching groups with no matches
      ;; handle the multiple match alist
      (while alist
        (and (string-match (caar alist) group)
             (setq score-files
                   (nconc score-files (copy-sequence (cdar alist)))))
        (setq alist (cdr alist)))
      (setq alist gnus-score-file-single-match-alist)
      ;; handle the single match alist
      (while alist
        (and (string-match (caar alist) group)
             ;; progn used just in case ("regexp") has no files
             ;; and score-files is still nil. -sj
             ;; this can be construed as a "stop searching here" feature :>
             ;; and used to simplify regexps in the single-alist 
             (progn
               (setq score-files
                     (nconc score-files (copy-sequence (cdar alist))))
               (setq alist nil)))
        (setq alist (cdr alist)))
      ;; cache the score files
      (setq gnus-score-file-alist-cache
            (cons (cons group score-files) gnus-score-file-alist-cache))
      score-files)))

(defun gnus-all-score-files ()
  "Return a list of all score files for the current group."
  (let ((funcs gnus-score-find-score-files-function)
        (group gnus-newsgroup-name)
        score-files)
    ;; Make sure funcs is a list.
    (and funcs
         (not (listp funcs))
         (setq funcs (list funcs)))
    ;; Get the initial score files for this group.
    (when funcs 
      (setq score-files (gnus-score-find-alist group)))
    ;; Add any home adapt files.
    (let ((home (gnus-home-score-file group t)))
      (when home
        (push home score-files)
        (setq gnus-newsgroup-adaptive-score-file home)))
    ;; Check whether there is a `adapt-file' group parameter.
    (let ((param-file (gnus-group-get-parameter group 'adapt-file)))
      (when param-file
        (push param-file score-files)
        (setq gnus-newsgroup-adaptive-score-file param-file)))
    ;; Go through all the functions for finding score files (or actual
    ;; scores) and add them to a list.
    (while funcs
      (when (gnus-functionp (car funcs))
        (setq score-files 
              (nconc score-files (funcall (car funcs) group))))
      (setq funcs (cdr funcs)))
    ;; Add any home score files.
    (let ((home (gnus-home-score-file group)))
      (when home
        (push home score-files)))
    ;; Check whether there is a `score-file' group parameter.
    (let ((param-file (gnus-group-get-parameter group 'score-file)))
      (when param-file
        (push param-file score-files)))
    ;; Do the scoring if there are any score files for this group.
    score-files))
    
(defun gnus-possibly-score-headers (&optional trace)
  "Do scoring if scoring is required."
  (let ((score-files (gnus-all-score-files)))
    (when score-files
      (gnus-score-headers score-files trace))))

(defun gnus-score-file-name (newsgroup &optional suffix)
  "Return the name of a score file for NEWSGROUP."
  (let ((suffix (or suffix gnus-score-file-suffix)))
    (nnheader-translate-file-chars
     (cond
      ((or (null newsgroup)
           (string-equal newsgroup ""))
       ;; The global score file is placed at top of the directory.
       (expand-file-name 
        suffix gnus-kill-files-directory))
      ((gnus-use-long-file-name 'not-score)
       ;; Append ".SCORE" to newsgroup name.
       (expand-file-name (concat (gnus-newsgroup-savable-name newsgroup)
                                 "." suffix)
                         gnus-kill-files-directory))
      (t
       ;; Place "SCORE" under the hierarchical directory.
       (expand-file-name (concat (gnus-newsgroup-directory-form newsgroup)
                                 "/" suffix)
                         gnus-kill-files-directory))))))

(defun gnus-score-search-global-directories (files)
  "Scan all global score directories for score files."
  ;; Set the variable `gnus-internal-global-score-files' to all
  ;; available global score files.
  (interactive (list gnus-global-score-files))
  (let (out)
    (while files
      (if (string-match "/$" (car files))
          (setq out (nconc (directory-files 
                            (car files) t
                            (concat (gnus-score-file-regexp) "$"))))
        (setq out (cons (car files) out)))
      (setq files (cdr files)))
    (setq gnus-internal-global-score-files out)))

(defun gnus-score-default-fold-toggle ()
  "Toggle folding for new score file entries."
  (interactive)
  (setq gnus-score-default-fold (not gnus-score-default-fold))
  (if gnus-score-default-fold
      (gnus-message 1 "New score file entries will be case insensitive.")
    (gnus-message 1 "New score file entries will be case sensitive.")))

;;; Home score file.

(defun gnus-home-score-file (group &optional adapt)
  "Return the home score file for GROUP.
If ADAPT, return the home adaptive file instead."
  (let ((list (if adapt gnus-home-adapt-file gnus-home-score-file))
        elem found)
    ;; Make sure we have a list.
    (unless (listp list)
      (setq list (list list)))
    ;; Go through the list and look for matches.
    (while (and (not found)
                (setq elem (pop list)))
      (setq found
            (cond
             ;; Simple string.
             ((stringp elem)
              elem)
             ;; Function.
             ((gnus-functionp elem)
              (funcall elem group))
             ;; Regexp-file cons
             ((consp elem)
              (when (string-match (car elem) group)
                (cdr elem))))))
    (when found
      (nnheader-concat gnus-kill-files-directory found))))

(defun gnus-hierarchial-home-score-file (group)
  "Return the score file of the top-level hierarchy of GROUP."
  (if (string-match "^[^.]+\\." group)
      (concat (match-string 0 group) gnus-score-file-suffix)
    ;; Group name without any dots.
    (concat group "." gnus-score-file-suffix)))
      
(defun gnus-hierarchial-home-adapt-file (group)
  "Return the adapt file of the top-level hierarchy of GROUP."
  (if (string-match "^[^.]+\\." group)
      (concat (match-string 0 group) gnus-adaptive-file-suffix)
    ;; Group name without any dots.
    (concat group "." gnus-adaptive-file-suffix)))

;;;
;;; Adaptive word scoring
;;;


(provide 'gnus-score)

;;; gnus-score.el ends here