1 ;;; gnus-topic.el --- a folding group mode for Gnus
2 ;; Copyright (C) 1995 Free Software Foundation, Inc.
4 ;; Author: Ilja Weis <kult@uni-paderborn.de>
5 ;; Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software; you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to
22 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
30 (defvar gnus-group-topic-face 'bold
31 "*Face used to highlight topic headers.")
33 (defvar gnus-group-topics '(("no" "^no" nil) ("misc" "." nil))
34 "*Alist of newsgroup topics.
35 This alist has entries of the form
39 where TOPIC is the name of the topic a group is put in if it matches
40 REGEXP. A group can only be in one topic at a time.
42 If SHOW is nil, newsgroups will be inserted according to
43 `gnus-group-topic-topics-only', otherwise that variable is ignored and
44 the groups are always shown if SHOW is true or never if SHOW is a
47 (defvar gnus-topic-names nil
48 "A list of all topic names.")
50 (defvar gnus-group-topic-topics-only nil
51 "*If non-nil, only the topics will be shown when typing `l' or `L'.")
53 (defvar gnus-topic-unique t
54 "*If non-nil, each group will only belong to one topic.")
56 ;; Internal variables.
58 (defvar gnus-topics-not-listed nil)
62 (defun gnus-group-topic-name ()
63 "The name of the topic on the current line."
64 (get-text-property (gnus-point-at-bol) 'gnus-topic))
66 (defun gnus-group-prepare-topics (level &optional all lowest regexp topic)
67 "List all newsgroups with unread articles of level LEVEL or lower, and
68 use the `gnus-group-topics' to sort the groups.
69 If ALL is non-nil, list groups that have no unread articles.
70 If LOWEST is non-nil, list all newsgroups of level LOWEST or higher."
71 (set-buffer gnus-group-buffer)
72 (let ((buffer-read-only nil)
73 (lowest (or lowest 1))
76 (or topic (erase-buffer))
79 (and (>= level gnus-level-zombie) (<= lowest gnus-level-zombie)
80 (gnus-group-prepare-flat-list-dead
81 (setq gnus-zombie-list (sort gnus-zombie-list 'string<))
85 (and (>= level gnus-level-killed) (<= lowest gnus-level-killed)
86 (gnus-group-prepare-flat-list-dead
87 (setq gnus-killed-list (sort gnus-killed-list 'string<))
92 (if (< lowest gnus-level-zombie)
93 (let ((topics (gnus-topic-find-groups topic))
95 (setq gnus-topic-names topics)
98 (setq topic (car (car topics))
99 tlist (cdr (car topics))
100 how (nth 2 (assoc topic gnus-group-topics))
109 (list 'mouse-face gnus-mouse-face
110 'face gnus-group-topic-face
113 ;; We insert the groups for the topics we want to have.
114 (if (and (or (and (not how) (not gnus-group-topic-topics-only))
115 (and how (not (numberp how))))
116 (not (member topic gnus-topics-not-listed)))
118 (setq gnus-topics-not-listed
119 (delete topic gnus-topics-not-listed))
120 (setq tlist (nreverse tlist))
122 (setq info (car tlist))
123 (gnus-group-insert-group-line
124 nil (car info) (car (cdr info)) (nth 3 info)
125 (car (gnus-gethash (car info) gnus-newsrc-hashtb))
127 (setq tlist (cdr tlist))))
128 (setq gnus-topics-not-listed
129 (cons topic gnus-topics-not-listed)))))))
131 (gnus-group-set-mode-line)
132 (setq gnus-group-list-mode (cons level all))
133 (run-hooks 'gnus-group-prepare-hook))
135 (defun gnus-topic-find-groups (&optional topic)
136 "Find all topics and all groups in all topics.
137 If TOPIC, just find the groups in that topic."
138 (let ((newsrc (cdr gnus-newsrc-alist))
139 (topics (mapcar (lambda (e) (list (car e)))
141 (topic-alist (if topic (list (assoc topic gnus-group-topics))
143 info clevel unread group w lowest level all gtopic)
144 (setq lowest (or lowest 1))
145 ;; We go through the newsrc to look for matches.
147 (setq info (car newsrc)
150 unread (car (gnus-gethash group gnus-newsrc-hashtb)))
152 unread ; nil means that the group is dead.
153 (setq clevel (car (cdr info)))
154 (>= clevel lowest) ; Is inside the level we want.
158 (cdr (assq 'tick (nth 3 info)))) ; Has right readedness.
160 ;; So we find out what topic this group belongs to. First we
161 ;; check the group parameters.
162 (setq gtopic (cdr (assq 'topic (nth 5 info))))
163 ;; On match, we add it.
164 (and (stringp gtopic)
166 (string= gtopic topic))
167 (if (setq e (assoc gtopic topics))
168 (setcdr e (cons info (cdr e)))
169 (setq topics (cons (list gtopic info) topics))))
170 ;; We look through the topic alist for further matches, if
172 (if (or (not gnus-topic-unique) (not (stringp gtopic)))
173 (let ((ts topic-alist))
175 (if (string-match (nth 1 (car ts)) group)
177 (setcdr (setq e (assoc (car (car ts)) topics))
179 (and gnus-topic-unique (setq ts nil))))
180 (setq ts (cdr ts))))))))
183 (defun gnus-topic-remove-topic ()
184 "Remove the current topic."
185 (let ((topic (gnus-group-topic-name))
189 (setq gnus-topics-not-listed (cons topic gnus-topics-not-listed))
191 (delete-region (point)
192 (or (next-single-property-change (point) 'gnus-topic)
195 (defun gnus-topic-insert-topic (topic)
197 (gnus-group-prepare-topics
198 (car gnus-group-list-mode) (cdr gnus-group-list-mode)
201 (defun gnus-topic-fold ()
202 "Remove/insert the current topic."
203 (let ((topic (gnus-group-topic-name)))
207 (if (not (member topic gnus-topics-not-listed))
208 ;; If the topic is visible, we remove it.
209 (gnus-topic-remove-topic)
210 ;; If not, we insert it.
212 (gnus-topic-insert-topic topic))))))
214 ;; Written by "jeff (j.d.) sparkes" <jsparkes@bnr.ca>.
215 (defun gnus-group-add-to-topic (n topic)
216 "Add the current group to a topic."
218 (list current-prefix-arg
219 (completing-read "Add to topic: " gnus-topic-names)))
220 (let ((groups (gnus-group-process-prefix n)))
221 (mapcar (lambda (g) (gnus-group-add-parameter g (cons 'topic topic)))
223 (gnus-group-position-point)))
225 ;;; gnus-topic.el ends here