1 ;;; gnus-bcklg.el --- backlog functions for Gnus
2 ;; Copyright (C) 1996,97,98 Free Software Foundation, Inc.
4 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
7 ;; This file is part of GNU Emacs.
9 ;; GNU Emacs is free software; you can redistribute it and/or modify
10 ;; it under the terms of the GNU General Public License as published by
11 ;; the Free Software Foundation; either version 2, or (at your option)
14 ;; GNU Emacs is distributed in the hope that it will be useful,
15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 ;; GNU General Public License for more details.
19 ;; You should have received a copy of the GNU General Public License
20 ;; along with GNU Emacs; see the file COPYING. If not, write to the
21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
22 ;; Boston, MA 02111-1307, USA.
28 (eval-when-compile (require 'cl
))
30 (eval-when-compile (require 'cl
))
35 ;;; Buffering of read articles.
38 (defvar gnus-backlog-buffer
" *Gnus Backlog*")
39 (defvar gnus-backlog-articles nil
)
40 (defvar gnus-backlog-hashtb nil
)
42 (defun gnus-backlog-buffer ()
43 "Return the backlog buffer."
44 (or (get-buffer gnus-backlog-buffer
)
46 (set-buffer (gnus-get-buffer-create gnus-backlog-buffer
))
47 (buffer-disable-undo (current-buffer))
48 (setq buffer-read-only t
)
49 (get-buffer gnus-backlog-buffer
))))
51 (defun gnus-backlog-setup ()
52 "Initialize backlog variables."
53 (unless gnus-backlog-hashtb
54 (setq gnus-backlog-hashtb
(gnus-make-hashtable 1024))))
56 (gnus-add-shutdown 'gnus-backlog-shutdown
'gnus
)
58 (defun gnus-backlog-shutdown ()
59 "Clear all backlog variables and buffers."
60 (when (get-buffer gnus-backlog-buffer
)
61 (kill-buffer gnus-backlog-buffer
))
62 (setq gnus-backlog-hashtb nil
63 gnus-backlog-articles nil
))
65 (defun gnus-backlog-enter-article (group number buffer
)
67 (let ((ident (intern (concat group
":" (int-to-string number
))
70 (if (memq ident gnus-backlog-articles
)
71 () ; It's already kept.
72 ;; Remove the oldest article, if necessary.
73 (and (numberp gnus-keep-backlog
)
74 (>= (length gnus-backlog-articles
) gnus-keep-backlog
)
75 (gnus-backlog-remove-oldest-article))
76 (push ident gnus-backlog-articles
)
77 ;; Insert the new article.
79 (set-buffer (gnus-backlog-buffer))
80 (let (buffer-read-only)
81 (goto-char (point-max))
85 (insert-buffer-substring buffer
)
86 ;; Tag the beginning of the article with the ident.
87 (gnus-put-text-property b
(1+ b
) 'gnus-backlog ident
))))))
89 (defun gnus-backlog-remove-oldest-article ()
91 (set-buffer (gnus-backlog-buffer))
92 (goto-char (point-min))
93 (if (zerop (buffer-size))
94 () ; The buffer is empty.
95 (let ((ident (get-text-property (point) 'gnus-backlog
))
97 ;; Remove the ident from the list of articles.
99 (setq gnus-backlog-articles
(delq ident gnus-backlog-articles
)))
100 ;; Delete the article itself.
102 (point) (next-single-property-change
103 (1+ (point)) 'gnus-backlog nil
(point-max)))))))
105 (defun gnus-backlog-remove-article (group number
)
106 "Remove article NUMBER in GROUP from the backlog."
107 (when (numberp number
)
109 (let ((ident (intern (concat group
":" (int-to-string number
))
110 gnus-backlog-hashtb
))
112 (when (memq ident gnus-backlog-articles
)
113 ;; It was in the backlog.
115 (set-buffer (gnus-backlog-buffer))
116 (let (buffer-read-only)
117 (when (setq beg
(text-property-any
118 (point-min) (point-max) 'gnus-backlog
120 ;; Find the end (i. e., the beginning of the next article).
122 (next-single-property-change
123 (1+ beg
) 'gnus-backlog
(current-buffer) (point-max)))
124 (delete-region beg end
)
127 (setq gnus-backlog-articles
(delq ident gnus-backlog-articles
)))))))
129 (defun gnus-backlog-request-article (group number buffer
)
130 (when (numberp number
)
132 (let ((ident (intern (concat group
":" (int-to-string number
))
133 gnus-backlog-hashtb
))
135 (when (memq ident gnus-backlog-articles
)
136 ;; It was in the backlog.
138 (set-buffer (gnus-backlog-buffer))
139 (if (not (setq beg
(text-property-any
140 (point-min) (point-max) 'gnus-backlog
142 ;; It wasn't in the backlog after all.
144 (setq gnus-backlog-articles
(delq ident gnus-backlog-articles
)))
145 ;; Find the end (i. e., the beginning of the next article).
147 (next-single-property-change
148 (1+ beg
) 'gnus-backlog
(current-buffer) (point-max)))))
149 (let ((buffer-read-only nil
))
151 (insert-buffer-substring gnus-backlog-buffer beg end
)
154 (provide 'gnus-bcklg
)
156 ;;; gnus-bcklg.el ends here