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- ;;; gnus-cite.el --- parse citations in articles for Gnus
- ;; Copyright (C) 1995,96,97 Free Software Foundation, Inc.
-
- ;; Author: Per Abrahamsen <abraham@iesd.auc.dk>
- ;; Keywords: news, mail
-
- ;; 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:
-
- (eval-when-compile (require 'cl))
-
- (require 'gnus)
- (require 'gnus-art)
- (require 'gnus-range)
-
- ;;; Customization:
-
- (defgroup gnus-cite nil
- "Citation."
- :prefix "gnus-cite-"
- :link '(custom-manual "(gnus)Article Highlighting")
- :group 'gnus-article)
-
- (defcustom gnus-cite-reply-regexp
- "^\\(Subject: Re\\|In-Reply-To\\|References\\):"
- "If headers match this regexp it is reasonable to believe that
- article has citations."
- :group 'gnus-cite
- :type 'string)
-
- (defcustom gnus-cite-always-check nil
- "Check article always for citations. Set it t to check all articles."
- :group 'gnus-cite
- :type '(choice (const :tag "no" nil)
- (const :tag "yes" t)))
-
- (defcustom gnus-cited-text-button-line-format "%(%{[...]%}%)\n"
- "Format of cited text buttons."
- :group 'gnus-cite
- :type 'string)
-
- (defcustom gnus-cited-lines-visible nil
- "The number of lines of hidden cited text to remain visible."
- :group 'gnus-cite
- :type '(choice (const :tag "none" nil)
- integer))
-
- (defcustom gnus-cite-parse-max-size 25000
- "Maximum article size (in bytes) where parsing citations is allowed.
- Set it to nil to parse all articles."
- :group 'gnus-cite
- :type '(choice (const :tag "all" nil)
- integer))
-
- (defcustom gnus-cite-prefix-regexp
- "^[]>|:}+ ]*[]>|:}+]\\(.*>\\)?\\|^.*>"
- "Regexp matching the longest possible citation prefix on a line."
- :group 'gnus-cite
- :type 'regexp)
-
- (defcustom gnus-cite-max-prefix 20
- "Maximum possible length for a citation prefix."
- :group 'gnus-cite
- :type 'integer)
-
- (defcustom gnus-supercite-regexp
- (concat "^\\(" gnus-cite-prefix-regexp "\\)? *"
- ">>>>> +\"\\([^\"\n]+\\)\" +==")
- "Regexp matching normal Supercite attribution lines.
- The first grouping must match prefixes added by other packages."
- :group 'gnus-cite
- :type 'regexp)
-
- (defcustom gnus-supercite-secondary-regexp "^.*\"\\([^\"\n]+\\)\" +=="
- "Regexp matching mangled Supercite attribution lines.
- The first regexp group should match the Supercite attribution."
- :group 'gnus-cite
- :type 'regexp)
-
- (defcustom gnus-cite-minimum-match-count 2
- "Minimum number of identical prefixes before we believe it's a citation."
- :group 'gnus-cite
- :type 'integer)
-
- (defcustom gnus-cite-attribution-prefix
- "in article\\|in <\\|On \\(Mon\\|Tue\\|Wed\\|Thu\\|Fri\\|Sat\\|Sun\\),"
- "Regexp matching the beginning of an attribution line."
- :group 'gnus-cite
- :type 'regexp)
-
- (defcustom gnus-cite-attribution-suffix
- "\\(\\(wrote\\|writes\\|said\\|says\\|>\\)\\(:\\|\\.\\.\\.\\)\\)[ ]*$"
- "Regexp matching the end of an attribution line.
- The text matching the first grouping will be used as a button."
- :group 'gnus-cite
- :type 'regexp)
-
- (defface gnus-cite-attribution-face '((t
- (:underline t)))
- "Face used for attribution lines.")
-
- (defcustom gnus-cite-attribution-face 'gnus-cite-attribution-face
- "Face used for attribution lines.
- It is merged with the face for the cited text belonging to the attribution."
- :group 'gnus-cite
- :type 'face)
-
- (defface gnus-cite-face-1 '((((class color)
- (background dark))
- (:foreground "light blue"))
- (((class color)
- (background light))
- (:foreground "MidnightBlue"))
- (t
- (:italic t)))
- "Citation face.")
-
- (defface gnus-cite-face-2 '((((class color)
- (background dark))
- (:foreground "light cyan"))
- (((class color)
- (background light))
- (:foreground "firebrick"))
- (t
- (:italic t)))
- "Citation face.")
-
- (defface gnus-cite-face-3 '((((class color)
- (background dark))
- (:foreground "light yellow"))
- (((class color)
- (background light))
- (:foreground "dark green"))
- (t
- (:italic t)))
- "Citation face.")
-
- (defface gnus-cite-face-4 '((((class color)
- (background dark))
- (:foreground "light pink"))
- (((class color)
- (background light))
- (:foreground "OrangeRed"))
- (t
- (:italic t)))
- "Citation face.")
-
- (defface gnus-cite-face-5 '((((class color)
- (background dark))
- (:foreground "pale green"))
- (((class color)
- (background light))
- (:foreground "dark khaki"))
- (t
- (:italic t)))
- "Citation face.")
-
- (defface gnus-cite-face-6 '((((class color)
- (background dark))
- (:foreground "beige"))
- (((class color)
- (background light))
- (:foreground "dark violet"))
- (t
- (:italic t)))
- "Citation face.")
-
- (defface gnus-cite-face-7 '((((class color)
- (background dark))
- (:foreground "orange"))
- (((class color)
- (background light))
- (:foreground "SteelBlue4"))
- (t
- (:italic t)))
- "Citation face.")
-
- (defface gnus-cite-face-8 '((((class color)
- (background dark))
- (:foreground "magenta"))
- (((class color)
- (background light))
- (:foreground "magenta"))
- (t
- (:italic t)))
- "Citation face.")
-
- (defface gnus-cite-face-9 '((((class color)
- (background dark))
- (:foreground "violet"))
- (((class color)
- (background light))
- (:foreground "violet"))
- (t
- (:italic t)))
- "Citation face.")
-
- (defface gnus-cite-face-10 '((((class color)
- (background dark))
- (:foreground "medium purple"))
- (((class color)
- (background light))
- (:foreground "medium purple"))
- (t
- (:italic t)))
- "Citation face.")
-
- (defface gnus-cite-face-11 '((((class color)
- (background dark))
- (:foreground "turquoise"))
- (((class color)
- (background light))
- (:foreground "turquoise"))
- (t
- (:italic t)))
- "Citation face.")
-
- (defcustom gnus-cite-face-list
- '(gnus-cite-face-1 gnus-cite-face-2 gnus-cite-face-3 gnus-cite-face-4
- gnus-cite-face-5 gnus-cite-face-6 gnus-cite-face-7 gnus-cite-face-8
- gnus-cite-face-9 gnus-cite-face-10 gnus-cite-face-11)
- "List of faces used for highlighting citations.
-
- When there are citations from multiple articles in the same message,
- Gnus will try to give each citation from each article its own face.
- This should make it easier to see who wrote what."
- :group 'gnus-cite
- :type '(repeat face))
-
- (defcustom gnus-cite-hide-percentage 50
- "Only hide excess citation if above this percentage of the body."
- :group 'gnus-cite
- :type 'number)
-
- (defcustom gnus-cite-hide-absolute 10
- "Only hide excess citation if above this number of lines in the body."
- :group 'gnus-cite
- :type 'integer)
-
- ;;; Internal Variables:
-
- (defvar gnus-cite-article nil)
-
- (defvar gnus-cite-prefix-alist nil)
- ;; Alist of citation prefixes.
- ;; The cdr is a list of lines with that prefix.
-
- (defvar gnus-cite-attribution-alist nil)
- ;; Alist of attribution lines.
- ;; The car is a line number.
- ;; The cdr is the prefix for the citation started by that line.
-
- (defvar gnus-cite-loose-prefix-alist nil)
- ;; Alist of citation prefixes that have no matching attribution.
- ;; The cdr is a list of lines with that prefix.
-
- (defvar gnus-cite-loose-attribution-alist nil)
- ;; Alist of attribution lines that have no matching citation.
- ;; Each member has the form (WROTE IN PREFIX TAG), where
- ;; WROTE: is the attribution line number
- ;; IN: is the line number of the previous line if part of the same attribution,
- ;; PREFIX: Is the citation prefix of the attribution line(s), and
- ;; TAG: Is a Supercite tag, if any.
-
- (defvar gnus-cited-text-button-line-format-alist
- `((?b (marker-position beg) ?d)
- (?e (marker-position end) ?d)
- (?l (- end beg) ?d)))
- (defvar gnus-cited-text-button-line-format-spec nil)
-
- ;;; Commands:
-
- (defun gnus-article-highlight-citation (&optional force)
- "Highlight cited text.
- Each citation in the article will be highlighted with a different face.
- The faces are taken from `gnus-cite-face-list'.
- Attribution lines are highlighted with the same face as the
- corresponding citation merged with `gnus-cite-attribution-face'.
-
- Text is considered cited if at least `gnus-cite-minimum-match-count'
- lines matches `gnus-cite-prefix-regexp' with the same prefix.
-
- Lines matching `gnus-cite-attribution-suffix' and perhaps
- `gnus-cite-attribution-prefix' are considered attribution lines."
- (interactive (list 'force))
- (save-excursion
- (set-buffer gnus-article-buffer)
- (gnus-cite-parse-maybe force)
- (let ((buffer-read-only nil)
- (alist gnus-cite-prefix-alist)
- (faces gnus-cite-face-list)
- (inhibit-point-motion-hooks t)
- face entry prefix skip numbers number face-alist)
- ;; Loop through citation prefixes.
- (while alist
- (setq entry (car alist)
- alist (cdr alist)
- prefix (car entry)
- numbers (cdr entry)
- face (car faces)
- faces (or (cdr faces) gnus-cite-face-list)
- face-alist (cons (cons prefix face) face-alist))
- (while numbers
- (setq number (car numbers)
- numbers (cdr numbers))
- (and (not (assq number gnus-cite-attribution-alist))
- (not (assq number gnus-cite-loose-attribution-alist))
- (gnus-cite-add-face number prefix face))))
- ;; Loop through attribution lines.
- (setq alist gnus-cite-attribution-alist)
- (while alist
- (setq entry (car alist)
- alist (cdr alist)
- number (car entry)
- prefix (cdr entry)
- skip (gnus-cite-find-prefix number)
- face (cdr (assoc prefix face-alist)))
- ;; Add attribution button.
- (goto-line number)
- (when (re-search-forward gnus-cite-attribution-suffix
- (save-excursion (end-of-line 1) (point))
- t)
- (gnus-article-add-button (match-beginning 1) (match-end 1)
- 'gnus-cite-toggle prefix))
- ;; Highlight attribution line.
- (gnus-cite-add-face number skip face)
- (gnus-cite-add-face number skip gnus-cite-attribution-face))
- ;; Loop through attribution lines.
- (setq alist gnus-cite-loose-attribution-alist)
- (while alist
- (setq entry (car alist)
- alist (cdr alist)
- number (car entry)
- skip (gnus-cite-find-prefix number))
- (gnus-cite-add-face number skip gnus-cite-attribution-face)))))
-
- (defun gnus-dissect-cited-text ()
- "Dissect the article buffer looking for cited text."
- (save-excursion
- (set-buffer gnus-article-buffer)
- (gnus-cite-parse-maybe)
- (let ((alist gnus-cite-prefix-alist)
- prefix numbers number marks m)
- ;; Loop through citation prefixes.
- (while alist
- (setq numbers (pop alist)
- prefix (pop numbers))
- (while numbers
- (setq number (pop numbers))
- (goto-char (point-min))
- (forward-line number)
- (push (cons (point-marker) "") marks)
- (while (and numbers
- (= (1- number) (car numbers)))
- (setq number (pop numbers)))
- (goto-char (point-min))
- (forward-line (1- number))
- (push (cons (point-marker) prefix) marks)))
- ;; Skip to the beginning of the body.
- (goto-char (point-min))
- (search-forward "\n\n" nil t)
- (push (cons (point-marker) "") marks)
- ;; Find the end of the body.
- (goto-char (point-max))
- (gnus-article-search-signature)
- (push (cons (point-marker) "") marks)
- ;; Sort the marks.
- (setq marks (sort marks (lambda (m1 m2) (< (car m1) (car m2)))))
- (let ((omarks marks))
- (setq marks nil)
- (while (cdr omarks)
- (if (= (caar omarks) (caadr omarks))
- (progn
- (unless (equal (cdar omarks) "")
- (push (car omarks) marks))
- (unless (equal (cdadr omarks) "")
- (push (cadr omarks) marks))
- (unless (and (equal (cdar omarks) "")
- (equal (cdadr omarks) "")
- (not (cddr omarks)))
- (setq omarks (cdr omarks))))
- (push (car omarks) marks))
- (setq omarks (cdr omarks)))
- (when (car omarks)
- (push (car omarks) marks))
- (setq marks (setq m (nreverse marks)))
- (while (cddr m)
- (if (and (equal (cdadr m) "")
- (equal (cdar m) (cdaddr m))
- (goto-char (caadr m))
- (forward-line 1)
- (= (point) (caaddr m)))
- (setcdr m (cdddr m))
- (setq m (cdr m))))
- marks))))
-
- (defun gnus-article-fill-cited-article (&optional force width)
- "Do word wrapping in the current article.
- If WIDTH (the numerical prefix), use that text width when filling."
- (interactive (list t current-prefix-arg))
- (save-excursion
- (set-buffer gnus-article-buffer)
- (let ((buffer-read-only nil)
- (inhibit-point-motion-hooks t)
- (marks (gnus-dissect-cited-text))
- (adaptive-fill-mode nil)
- (filladapt-mode nil)
- (fill-column (if width (prefix-numeric-value width) fill-column)))
- (save-restriction
- (while (cdr marks)
- (widen)
- (narrow-to-region (caar marks) (caadr marks))
- (let ((adaptive-fill-regexp
- (concat "^" (regexp-quote (cdar marks)) " *"))
- (fill-prefix (cdar marks)))
- (fill-region (point-min) (point-max)))
- (set-marker (caar marks) nil)
- (setq marks (cdr marks)))
- (when marks
- (set-marker (caar marks) nil))
- ;; All this information is now incorrect.
- (setq gnus-cite-prefix-alist nil
- gnus-cite-attribution-alist nil
- gnus-cite-loose-prefix-alist nil
- gnus-cite-loose-attribution-alist nil
- gnus-cite-article nil)))))
-
- (defun gnus-article-hide-citation (&optional arg force)
- "Toggle hiding of all cited text except attribution lines.
- See the documentation for `gnus-article-highlight-citation'.
- If given a negative prefix, always show; if given a positive prefix,
- always hide."
- (interactive (append (gnus-article-hidden-arg) (list 'force)))
- (setq gnus-cited-text-button-line-format-spec
- (gnus-parse-format gnus-cited-text-button-line-format
- gnus-cited-text-button-line-format-alist t))
- (save-excursion
- (set-buffer gnus-article-buffer)
- (cond
- ((gnus-article-check-hidden-text 'cite arg)
- t)
- ((gnus-article-text-type-exists-p 'cite)
- (let ((buffer-read-only nil))
- (gnus-article-hide-text-of-type 'cite)))
- (t
- (let ((buffer-read-only nil)
- (marks (gnus-dissect-cited-text))
- (inhibit-point-motion-hooks t)
- (props (nconc (list 'article-type 'cite)
- gnus-hidden-properties))
- beg end)
- (while marks
- (setq beg nil
- end nil)
- (while (and marks (string= (cdar marks) ""))
- (setq marks (cdr marks)))
- (when marks
- (setq beg (caar marks)))
- (while (and marks (not (string= (cdar marks) "")))
- (setq marks (cdr marks)))
- (when marks
- (setq end (caar marks)))
- ;; Skip past lines we want to leave visible.
- (when (and beg end gnus-cited-lines-visible)
- (goto-char beg)
- (forward-line gnus-cited-lines-visible)
- (if (>= (point) end)
- (setq beg nil)
- (setq beg (point-marker))))
- (when (and beg end)
- (gnus-add-text-properties beg end props)
- (goto-char beg)
- (unless (save-excursion (search-backward "\n\n" nil t))
- (insert "\n"))
- (put-text-property
- (point)
- (progn
- (gnus-article-add-button
- (point)
- (progn (eval gnus-cited-text-button-line-format-spec) (point))
- `gnus-article-toggle-cited-text (cons beg end))
- (point))
- 'article-type 'annotation)
- (set-marker beg (point)))))))))
-
- (defun gnus-article-toggle-cited-text (region)
- "Toggle hiding the text in REGION."
- (let (buffer-read-only)
- (funcall
- (if (text-property-any
- (car region) (1- (cdr region))
- (car gnus-hidden-properties) (cadr gnus-hidden-properties))
- 'remove-text-properties 'gnus-add-text-properties)
- (car region) (cdr region) gnus-hidden-properties)))
-
- (defun gnus-article-hide-citation-maybe (&optional arg force)
- "Toggle hiding of cited text that has an attribution line.
- If given a negative prefix, always show; if given a positive prefix,
- always hide.
- This will do nothing unless at least `gnus-cite-hide-percentage'
- percent and at least `gnus-cite-hide-absolute' lines of the body is
- cited text with attributions. When called interactively, these two
- variables are ignored.
- See also the documentation for `gnus-article-highlight-citation'."
- (interactive (append (gnus-article-hidden-arg) (list 'force)))
- (unless (gnus-article-check-hidden-text 'cite arg)
- (save-excursion
- (set-buffer gnus-article-buffer)
- (gnus-cite-parse-maybe force)
- (goto-char (point-min))
- (search-forward "\n\n" nil t)
- (let ((start (point))
- (atts gnus-cite-attribution-alist)
- (buffer-read-only nil)
- (inhibit-point-motion-hooks t)
- (hiden 0)
- total)
- (goto-char (point-max))
- (gnus-article-search-signature)
- (setq total (count-lines start (point)))
- (while atts
- (setq hiden (+ hiden (length (cdr (assoc (cdar atts)
- gnus-cite-prefix-alist))))
- atts (cdr atts)))
- (when (or force
- (and (> (* 100 hiden) (* gnus-cite-hide-percentage total))
- (> hiden gnus-cite-hide-absolute)))
- (setq atts gnus-cite-attribution-alist)
- (while atts
- (setq total (cdr (assoc (cdar atts) gnus-cite-prefix-alist))
- atts (cdr atts))
- (while total
- (setq hiden (car total)
- total (cdr total))
- (goto-line hiden)
- (unless (assq hiden gnus-cite-attribution-alist)
- (gnus-add-text-properties
- (point) (progn (forward-line 1) (point))
- (nconc (list 'article-type 'cite)
- gnus-hidden-properties))))))))))
-
- (defun gnus-article-hide-citation-in-followups ()
- "Hide cited text in non-root articles."
- (interactive)
- (save-excursion
- (set-buffer gnus-article-buffer)
- (let ((article (cdr gnus-article-current)))
- (unless (save-excursion
- (set-buffer gnus-summary-buffer)
- (gnus-article-displayed-root-p article))
- (gnus-article-hide-citation)))))
-
- ;;; Internal functions:
-
- (defun gnus-cite-parse-maybe (&optional force)
- ;; Parse if the buffer has changes since last time.
- (if (equal gnus-cite-article gnus-article-current)
- ()
- ;;Reset parser information.
- (setq gnus-cite-prefix-alist nil
- gnus-cite-attribution-alist nil
- gnus-cite-loose-prefix-alist nil
- gnus-cite-loose-attribution-alist nil)
- ;; Parse if not too large.
- (if (and (not force)
- gnus-cite-parse-max-size
- (> (buffer-size) gnus-cite-parse-max-size))
- ()
- (setq gnus-cite-article (cons (car gnus-article-current)
- (cdr gnus-article-current)))
- (gnus-cite-parse-wrapper))))
-
- (defun gnus-cite-parse-wrapper ()
- ;; Wrap chopped gnus-cite-parse
- (goto-char (point-min))
- (unless (search-forward "\n\n" nil t)
- (goto-char (point-max)))
- (save-excursion
- (gnus-cite-parse-attributions))
- ;; Try to avoid check citation if there is no reason to believe
- ;; that article has citations
- (if (or gnus-cite-always-check
- (save-excursion
- (re-search-backward gnus-cite-reply-regexp nil t))
- gnus-cite-loose-attribution-alist)
- (progn (save-excursion
- (gnus-cite-parse))
- (save-excursion
- (gnus-cite-connect-attributions)))))
-
- (defun gnus-cite-parse ()
- ;; Parse and connect citation prefixes and attribution lines.
-
- ;; Parse current buffer searching for citation prefixes.
- (let ((line (1+ (count-lines (point-min) (point))))
- (case-fold-search t)
- (max (save-excursion
- (goto-char (point-max))
- (gnus-article-search-signature)
- (point)))
- alist entry start begin end numbers prefix)
- ;; Get all potential prefixes in `alist'.
- (while (< (point) max)
- ;; Each line.
- (setq begin (point)
- end (progn (beginning-of-line 2) (point))
- start end)
- (goto-char begin)
- ;; Ignore standard Supercite attribution prefix.
- (when (looking-at gnus-supercite-regexp)
- (if (match-end 1)
- (setq end (1+ (match-end 1)))
- (setq end (1+ begin))))
- ;; Ignore very long prefixes.
- (when (> end (+ (point) gnus-cite-max-prefix))
- (setq end (+ (point) gnus-cite-max-prefix)))
- (while (re-search-forward gnus-cite-prefix-regexp (1- end) t)
- ;; Each prefix.
- (setq end (match-end 0)
- prefix (buffer-substring begin end))
- (gnus-set-text-properties 0 (length prefix) nil prefix)
- (setq entry (assoc prefix alist))
- (if entry
- (setcdr entry (cons line (cdr entry)))
- (push (list prefix line) alist))
- (goto-char begin))
- (goto-char start)
- (setq line (1+ line)))
- ;; We got all the potential prefixes. Now create
- ;; `gnus-cite-prefix-alist' containing the oldest prefix for each
- ;; line that appears at least gnus-cite-minimum-match-count
- ;; times. First sort them by length. Longer is older.
- (setq alist (sort alist (lambda (a b)
- (> (length (car a)) (length (car b))))))
- (while alist
- (setq entry (car alist)
- prefix (car entry)
- numbers (cdr entry)
- alist (cdr alist))
- (cond ((null numbers)
- ;; No lines with this prefix that wasn't also part of
- ;; a longer prefix.
- )
- ((< (length numbers) gnus-cite-minimum-match-count)
- ;; Too few lines with this prefix. We keep it a bit
- ;; longer in case it is an exact match for an attribution
- ;; line, but we don't remove the line from other
- ;; prefixes.
- (push entry gnus-cite-prefix-alist))
- (t
- (push entry
- gnus-cite-prefix-alist)
- ;; Remove articles from other prefixes.
- (let ((loop alist)
- current)
- (while loop
- (setq current (car loop)
- loop (cdr loop))
- (setcdr current
- (gnus-set-difference (cdr current) numbers)))))))))
-
- (defun gnus-cite-parse-attributions ()
- (let (al-alist)
- ;; Parse attributions
- (while (re-search-forward gnus-cite-attribution-suffix (point-max) t)
- (let* ((start (match-beginning 0))
- (end (match-end 0))
- (wrote (count-lines (point-min) end))
- (prefix (gnus-cite-find-prefix wrote))
- ;; Check previous line for an attribution leader.
- (tag (progn
- (beginning-of-line 1)
- (when (looking-at gnus-supercite-secondary-regexp)
- (buffer-substring (match-beginning 1)
- (match-end 1)))))
- (in (progn
- (goto-char start)
- (and (re-search-backward gnus-cite-attribution-prefix
- (save-excursion
- (beginning-of-line 0)
- (point))
- t)
- (not (re-search-forward gnus-cite-attribution-suffix
- start t))
- (count-lines (point-min) (1+ (point)))))))
- (when (eq wrote in)
- (setq in nil))
- (goto-char end)
- ;; don't add duplicates
- (let ((al (buffer-substring (save-excursion (beginning-of-line 0)
- (1+ (point)))
- end)))
- (if (not (assoc al al-alist))
- (progn
- (push (list wrote in prefix tag)
- gnus-cite-loose-attribution-alist)
- (push (cons al t) al-alist))))))))
-
- (defun gnus-cite-connect-attributions ()
- ;; Connect attributions to citations
-
- ;; No citations have been connected to attribution lines yet.
- (setq gnus-cite-loose-prefix-alist (append gnus-cite-prefix-alist nil))
-
- ;; Parse current buffer searching for attribution lines.
- ;; Find exact supercite citations.
- (gnus-cite-match-attributions 'small nil
- (lambda (prefix tag)
- (when tag
- (concat "\\`"
- (regexp-quote prefix) "[ \t]*"
- (regexp-quote tag) ">"))))
- ;; Find loose supercite citations after attributions.
- (gnus-cite-match-attributions 'small t
- (lambda (prefix tag)
- (when tag
- (concat "\\<"
- (regexp-quote tag)
- "\\>"))))
- ;; Find loose supercite citations anywhere.
- (gnus-cite-match-attributions 'small nil
- (lambda (prefix tag)
- (when tag
- (concat "\\<"
- (regexp-quote tag)
- "\\>"))))
- ;; Find nested citations after attributions.
- (gnus-cite-match-attributions 'small-if-unique t
- (lambda (prefix tag)
- (concat "\\`" (regexp-quote prefix) ".+")))
- ;; Find nested citations anywhere.
- (gnus-cite-match-attributions 'small nil
- (lambda (prefix tag)
- (concat "\\`" (regexp-quote prefix) ".+")))
- ;; Remove loose prefixes with too few lines.
- (let ((alist gnus-cite-loose-prefix-alist)
- entry)
- (while alist
- (setq entry (car alist)
- alist (cdr alist))
- (when (< (length (cdr entry)) gnus-cite-minimum-match-count)
- (setq gnus-cite-prefix-alist
- (delq entry gnus-cite-prefix-alist)
- gnus-cite-loose-prefix-alist
- (delq entry gnus-cite-loose-prefix-alist)))))
- ;; Find flat attributions.
- (gnus-cite-match-attributions 'first t nil)
- ;; Find any attributions (are we getting desperate yet?).
- (gnus-cite-match-attributions 'first nil nil))
-
- (defun gnus-cite-match-attributions (sort after fun)
- ;; Match all loose attributions and citations (SORT AFTER FUN) .
- ;;
- ;; If SORT is `small', the citation with the shortest prefix will be
- ;; used, if it is `first' the first prefix will be used, if it is
- ;; `small-if-unique' the shortest prefix will be used if the
- ;; attribution line does not share its own prefix with other
- ;; loose attribution lines, otherwise the first prefix will be used.
- ;;
- ;; If AFTER is non-nil, only citations after the attribution line
- ;; will be considered.
- ;;
- ;; If FUN is non-nil, it will be called with the arguments (WROTE
- ;; PREFIX TAG) and expected to return a regular expression. Only
- ;; citations whose prefix matches the regular expression will be
- ;; considered.
- ;;
- ;; WROTE is the attribution line number.
- ;; PREFIX is the attribution line prefix.
- ;; TAG is the Supercite tag on the attribution line.
- (let ((atts gnus-cite-loose-attribution-alist)
- (case-fold-search t)
- att wrote in prefix tag regexp limit smallest best size)
- (while atts
- (setq att (car atts)
- atts (cdr atts)
- wrote (nth 0 att)
- in (nth 1 att)
- prefix (nth 2 att)
- tag (nth 3 att)
- regexp (if fun (funcall fun prefix tag) "")
- size (cond ((eq sort 'small) t)
- ((eq sort 'first) nil)
- (t (< (length (gnus-cite-find-loose prefix)) 2)))
- limit (if after wrote -1)
- smallest 1000000
- best nil)
- (let ((cites gnus-cite-loose-prefix-alist)
- cite candidate numbers first compare)
- (while cites
- (setq cite (car cites)
- cites (cdr cites)
- candidate (car cite)
- numbers (cdr cite)
- first (apply 'min numbers)
- compare (if size (length candidate) first))
- (and (> first limit)
- regexp
- (string-match regexp candidate)
- (< compare smallest)
- (setq best cite
- smallest compare))))
- (if (null best)
- ()
- (setq gnus-cite-loose-attribution-alist
- (delq att gnus-cite-loose-attribution-alist))
- (push (cons wrote (car best)) gnus-cite-attribution-alist)
- (when in
- (push (cons in (car best)) gnus-cite-attribution-alist))
- (when (memq best gnus-cite-loose-prefix-alist)
- (let ((loop gnus-cite-prefix-alist)
- (numbers (cdr best))
- current)
- (setq gnus-cite-loose-prefix-alist
- (delq best gnus-cite-loose-prefix-alist))
- (while loop
- (setq current (car loop)
- loop (cdr loop))
- (if (eq current best)
- ()
- (setcdr current (gnus-set-difference (cdr current) numbers))
- (when (null (cdr current))
- (setq gnus-cite-loose-prefix-alist
- (delq current gnus-cite-loose-prefix-alist)
- atts (delq current atts)))))))))))
-
- (defun gnus-cite-find-loose (prefix)
- ;; Return a list of loose attribution lines prefixed by PREFIX.
- (let* ((atts gnus-cite-loose-attribution-alist)
- att line lines)
- (while atts
- (setq att (car atts)
- line (car att)
- atts (cdr atts))
- (when (string-equal (gnus-cite-find-prefix line) prefix)
- (push line lines)))
- lines))
-
- (defun gnus-cite-add-face (number prefix face)
- ;; At line NUMBER, ignore PREFIX and add FACE to the rest of the line.
- (when face
- (let ((inhibit-point-motion-hooks t)
- from to)
- (goto-line number)
- (unless (eobp);; Sometimes things become confused.
- (forward-char (length prefix))
- (skip-chars-forward " \t")
- (setq from (point))
- (end-of-line 1)
- (skip-chars-backward " \t")
- (setq to (point))
- (when (< from to)
- (gnus-overlay-put (gnus-make-overlay from to) 'face face))))))
-
- (defun gnus-cite-toggle (prefix)
- (save-excursion
- (set-buffer gnus-article-buffer)
- (let ((buffer-read-only nil)
- (numbers (cdr (assoc prefix gnus-cite-prefix-alist)))
- (inhibit-point-motion-hooks t)
- number)
- (while numbers
- (setq number (car numbers)
- numbers (cdr numbers))
- (goto-line number)
- (cond ((get-text-property (point) 'invisible)
- (remove-text-properties (point) (progn (forward-line 1) (point))
- gnus-hidden-properties))
- ((assq number gnus-cite-attribution-alist))
- (t
- (gnus-add-text-properties
- (point) (progn (forward-line 1) (point))
- (nconc (list 'article-type 'cite)
- gnus-hidden-properties))))))))
-
- (defun gnus-cite-find-prefix (line)
- ;; Return citation prefix for LINE.
- (let ((alist gnus-cite-prefix-alist)
- (prefix "")
- entry)
- (while alist
- (setq entry (car alist)
- alist (cdr alist))
- (when (memq line (cdr entry))
- (setq prefix (car entry))))
- prefix))
-
- (gnus-add-shutdown 'gnus-cache-close 'gnus)
-
- (defun gnus-cache-close ()
- (setq gnus-cite-prefix-alist nil))
-
- (gnus-ems-redefine)
-
- (provide 'gnus-cite)
-
- ;;; gnus-cite.el ends here
-