1 ;;; riece-shrink-buffer.el --- free old IRC messages to save memory usage
2 ;; Copyright (C) 1998-2005 Daiki Ueno
4 ;; Author: Daiki Ueno <ueno@unixuser.org>
6 ;; Keywords: IRC, riece
8 ;; This file is part of Riece.
10 ;; This program 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 ;; This program 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 the
22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 ;; Boston, MA 02111-1307, USA.
27 ;; NOTE: This is an add-on module for Riece.
31 (require 'riece-globals)
33 (defgroup riece-shrink-buffer nil
34 "Free old IRC messages to save memory usage."
38 (defcustom riece-shrink-buffer-idle-time-delay 5
39 "Number of idle seconds to wait before shrinking channel buffers."
41 :group 'riece-shrink-buffer)
43 (defcustom riece-max-buffer-size 65536
44 "Maximum size of channel buffers."
45 :type '(integer :tag "Number of characters")
46 :group 'riece-shrink-buffer)
48 (defcustom riece-shrink-buffer-remove-chars (/ riece-max-buffer-size 2)
49 "Number of chars removed when shrinking channel buffers."
51 :group 'riece-shrink-buffer)
53 (defvar riece-shrink-buffer-idle-timer nil
54 "Timer object to periodically shrink channel buffers.")
56 (defconst riece-shrink-buffer-description
57 "Free old IRC messages to save memory usage.")
59 (defvar riece-shrink-buffer-enabled nil)
61 (defun riece-shrink-buffer-idle-timer ()
62 (let ((buffers riece-buffer-list))
64 (if (and riece-shrink-buffer-enabled
65 (buffer-live-p (car buffers))
66 (eq (derived-mode-class
67 (with-current-buffer (car buffers)
69 'riece-dialogue-mode))
70 (riece-shrink-buffer (car buffers)))
71 (setq buffers (cdr buffers)))))
73 (defun riece-shrink-buffer (buffer)
76 (goto-char (point-min))
77 (while (> (buffer-size) riece-max-buffer-size)
78 (let* ((inhibit-read-only t)
81 (goto-char riece-shrink-buffer-remove-chars)
84 (overlays (riece-overlays-in (point-min) end)))
86 (riece-delete-overlay (car overlays))
87 (setq overlays (cdr overlays)))
88 (delete-region (point-min) end)))))
90 (defun riece-shrink-buffer-startup-hook ()
91 (setq riece-shrink-buffer-idle-timer
92 (riece-run-with-idle-timer
93 riece-shrink-buffer-idle-time-delay t
94 'riece-shrink-buffer-idle-timer)))
96 (defun riece-shrink-buffer-exit-hook ()
97 (if riece-shrink-buffer-idle-timer
98 (riece-cancel-timer riece-shrink-buffer-idle-timer)))
100 (defun riece-shrink-buffer-insinuate ()
101 (add-hook 'riece-startup-hook
102 'riece-shrink-buffer-startup-hook)
103 ;; Reset the timer since riece-shrink-buffer-insinuate will be
104 ;; called before running riece-startup-hook.
105 (unless riece-shrink-buffer-idle-timer
106 (riece-shrink-buffer-startup-hook))
107 (add-hook 'riece-exit-hook
108 'riece-shrink-buffer-exit-hook))
110 (defun riece-shrink-buffer-uninstall ()
111 (riece-shrink-buffer-exit-hook)
112 (remove-hook 'riece-startup-hook
113 'riece-shrink-buffer-startup-hook)
114 (remove-hook 'riece-exit-hook
115 'riece-shrink-buffer-exit-hook))
117 (defun riece-shrink-buffer-enable ()
118 (setq riece-shrink-buffer-enabled t))
120 (defun riece-shrink-buffer-disable ()
121 (setq riece-shrink-buffer-enabled nil))
123 (provide 'riece-shrink-buffer)
125 ;;; riece-shrink-buffer.el ends here