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eec82323 | 1 | ;;; gnus-dup.el --- suppression of duplicate articles in Gnus |
16409b0b GM |
2 | ;; Copyright (C) 1996, 1997, 1998, 1999, 2000 |
3 | ;; Free Software Foundation, Inc. | |
eec82323 | 4 | |
6748645f | 5 | ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org> |
eec82323 LMI |
6 | ;; Keywords: news |
7 | ||
8 | ;; This file is part of GNU Emacs. | |
9 | ||
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) | |
13 | ;; any later version. | |
14 | ||
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. | |
19 | ||
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 the | |
22 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | ;; Boston, MA 02111-1307, USA. | |
24 | ||
25 | ;;; Commentary: | |
26 | ||
27 | ;; This package tries to mark articles as read the second time the | |
28 | ;; user reads a copy. This is useful if the server doesn't support | |
29 | ;; Xref properly, or if the user reads the same group from several | |
30 | ;; servers. | |
31 | ||
32 | ;;; Code: | |
33 | ||
7df7482d RS |
34 | (eval-when-compile (require 'cl)) |
35 | ||
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36 | (require 'gnus) |
37 | (require 'gnus-art) | |
38 | ||
39 | (defgroup gnus-duplicate nil | |
40 | "Suppression of duplicate articles." | |
41 | :group 'gnus) | |
42 | ||
43 | (defcustom gnus-save-duplicate-list nil | |
44 | "*If non-nil, save the duplicate list when shutting down Gnus. | |
45 | If nil, duplicate suppression will only work on duplicates | |
46 | seen in the same session." | |
47 | :group 'gnus-duplicate | |
48 | :type 'boolean) | |
49 | ||
50 | (defcustom gnus-duplicate-list-length 10000 | |
51 | "*The number of Message-IDs to keep in the duplicate suppression list." | |
52 | :group 'gnus-duplicate | |
53 | :type 'integer) | |
54 | ||
55 | (defcustom gnus-duplicate-file (nnheader-concat gnus-directory "suppression") | |
56 | "*The name of the file to store the duplicate suppression list." | |
57 | :group 'gnus-duplicate | |
58 | :type 'file) | |
59 | ||
60 | ;;; Internal variables | |
61 | ||
62 | (defvar gnus-dup-list nil) | |
63 | (defvar gnus-dup-hashtb nil) | |
64 | ||
65 | (defvar gnus-dup-list-dirty nil) | |
66 | ||
67 | ;;; | |
68 | ;;; Starting and stopping | |
69 | ;;; | |
70 | ||
71 | (gnus-add-shutdown 'gnus-dup-close 'gnus) | |
72 | ||
73 | (defun gnus-dup-close () | |
74 | "Possibly save the duplicate suppression list and shut down the subsystem." | |
75 | (gnus-dup-save) | |
76 | (setq gnus-dup-list nil | |
77 | gnus-dup-hashtb nil | |
78 | gnus-dup-list-dirty nil)) | |
79 | ||
80 | (defun gnus-dup-open () | |
81 | "Possibly read the duplicate suppression list and start the subsystem." | |
82 | (if gnus-save-duplicate-list | |
83 | (gnus-dup-read) | |
84 | (setq gnus-dup-list nil)) | |
85 | (setq gnus-dup-hashtb (gnus-make-hashtable gnus-duplicate-list-length)) | |
86 | ;; Enter all Message-IDs into the hash table. | |
87 | (let ((list gnus-dup-list) | |
88 | (obarray gnus-dup-hashtb)) | |
89 | (while list | |
90 | (intern (pop list))))) | |
91 | ||
92 | (defun gnus-dup-read () | |
93 | "Read the duplicate suppression list." | |
94 | (setq gnus-dup-list nil) | |
95 | (when (file-exists-p gnus-duplicate-file) | |
96 | (load gnus-duplicate-file t t t))) | |
97 | ||
98 | (defun gnus-dup-save () | |
99 | "Save the duplicate suppression list." | |
100 | (when (and gnus-save-duplicate-list | |
101 | gnus-dup-list-dirty) | |
16409b0b | 102 | (with-temp-file gnus-duplicate-file |
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103 | (gnus-prin1 `(setq gnus-dup-list ',gnus-dup-list)))) |
104 | (setq gnus-dup-list-dirty nil)) | |
105 | ||
106 | ;;; | |
107 | ;;; Interface functions | |
108 | ;;; | |
109 | ||
110 | (defun gnus-dup-enter-articles () | |
111 | "Enter articles from the current group for future duplicate suppression." | |
112 | (unless gnus-dup-list | |
113 | (gnus-dup-open)) | |
114 | (setq gnus-dup-list-dirty t) ; mark list for saving | |
115 | (let ((data gnus-newsgroup-data) | |
116 | datum msgid) | |
117 | ;; Enter the Message-IDs of all read articles into the list | |
118 | ;; and hash table. | |
119 | (while (setq datum (pop data)) | |
120 | (when (and (not (gnus-data-pseudo-p datum)) | |
121 | (> (gnus-data-number datum) 0) | |
6748645f | 122 | (not (memq (gnus-data-number datum) gnus-newsgroup-unreads)) |
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123 | (not (= (gnus-data-mark datum) gnus-canceled-mark)) |
124 | (setq msgid (mail-header-id (gnus-data-header datum))) | |
125 | (not (nnheader-fake-message-id-p msgid)) | |
126 | (not (intern-soft msgid gnus-dup-hashtb))) | |
127 | (push msgid gnus-dup-list) | |
128 | (intern msgid gnus-dup-hashtb)))) | |
129 | ;; Chop off excess Message-IDs from the list. | |
130 | (let ((end (nthcdr gnus-duplicate-list-length gnus-dup-list))) | |
131 | (when end | |
132 | (setcdr end nil)))) | |
133 | ||
134 | (defun gnus-dup-suppress-articles () | |
135 | "Mark duplicate articles as read." | |
136 | (unless gnus-dup-list | |
137 | (gnus-dup-open)) | |
138 | (gnus-message 6 "Suppressing duplicates...") | |
139 | (let ((headers gnus-newsgroup-headers) | |
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140 | (auto (and gnus-newsgroup-auto-expire |
141 | (memq gnus-duplicate-mark gnus-auto-expirable-marks))) | |
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142 | number header) |
143 | (while (setq header (pop headers)) | |
144 | (when (and (intern-soft (mail-header-id header) gnus-dup-hashtb) | |
145 | (gnus-summary-article-unread-p (mail-header-number header))) | |
146 | (setq gnus-newsgroup-unreads | |
147 | (delq (setq number (mail-header-number header)) | |
148 | gnus-newsgroup-unreads)) | |
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149 | (if (not auto) |
150 | (push (cons number gnus-duplicate-mark) gnus-newsgroup-reads) | |
151 | (push number gnus-newsgroup-expirable) | |
152 | (push (cons number gnus-expirable-mark) gnus-newsgroup-reads))))) | |
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153 | (gnus-message 6 "Suppressing duplicates...done")) |
154 | ||
155 | (defun gnus-dup-unsuppress-article (article) | |
156 | "Stop suppression of ARTICLE." | |
157 | (let ((id (mail-header-id (gnus-data-header (gnus-data-find article))))) | |
158 | (when id | |
159 | (setq gnus-dup-list-dirty t) | |
160 | (setq gnus-dup-list (delete id gnus-dup-list)) | |
161 | (unintern id gnus-dup-hashtb)))) | |
162 | ||
163 | (provide 'gnus-dup) | |
164 | ||
165 | ;;; gnus-dup.el ends here |