cgit.sxemacs.org Git - riece/blob - lisp/riece-shrink-buffer.el

   1 ;;; riece-shrink-buffer.el --- free old IRC messages to save memory usage
   2 ;; Copyright (C) 1998-2005 Daiki Ueno
   3
   4 ;; Author: Daiki Ueno <ueno@unixuser.org>
   5 ;; Created: 1998-09-28
   6 ;; Keywords: IRC, riece
   7
   8 ;; This file is part of Riece.
   9
  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)
  13 ;; any later version.
  14
  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.
  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 ;; NOTE: This is an add-on module for Riece.
  28
  29 ;;; Code:
  30
  31 (require 'riece-globals)
  32
  33 (defgroup riece-shrink-buffer nil
  34   "Free old IRC messages to save memory usage."
  35   :prefix "riece-"
  36   :group 'riece)
  37
  38 (defcustom riece-shrink-buffer-idle-time-delay 5
  39   "Number of idle seconds to wait before shrinking channel buffers."
  40   :type 'integer
  41   :group 'riece-shrink-buffer)
  42
  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)
  47
  48 (defcustom riece-shrink-buffer-remove-chars (/ riece-max-buffer-size 2)
  49   "Number of chars removed when shrinking channel buffers."
  50   :type 'integer
  51   :group 'riece-shrink-buffer)
  52
  53 (defvar riece-shrink-buffer-idle-timer nil
  54   "Timer object to periodically shrink channel buffers.")
  55
  56 (defconst riece-shrink-buffer-description
  57   "Free old IRC messages to save memory usage.")
  58
  59 (defvar riece-shrink-buffer-enabled nil)
  60
  61 (defun riece-shrink-buffer-idle-timer ()
  62   (let ((buffers riece-buffer-list))
  63     (while buffers
  64       (if (and riece-shrink-buffer-enabled
  65                (buffer-live-p (car buffers))
  66                (eq (derived-mode-class
  67                     (with-current-buffer (car buffers)
  68                       major-mode))
  69                    'riece-dialogue-mode))
  70           (riece-shrink-buffer (car buffers)))
  71       (setq buffers (cdr buffers)))))
  72
  73 (defun riece-shrink-buffer (buffer)
  74   (save-excursion
  75     (set-buffer buffer)
  76     (goto-char (point-min))
  77     (while (> (buffer-size) riece-max-buffer-size)
  78       (let* ((inhibit-read-only t)
  79              buffer-read-only
  80              (end (progn
  81                     (goto-char riece-shrink-buffer-remove-chars)
  82                     (beginning-of-line 2)
  83                     (point)))
  84              (overlays (riece-overlays-in (point-min) end)))
  85         (while overlays
  86           (riece-delete-overlay (car overlays))
  87           (setq overlays (cdr overlays)))
  88         (delete-region (point-min) end)))))
  89
  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)))
  95
  96 (defun riece-shrink-buffer-exit-hook ()
  97   (if riece-shrink-buffer-idle-timer
  98       (riece-cancel-timer riece-shrink-buffer-idle-timer)))
  99
 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))
 109
 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))
 116
 117 (defun riece-shrink-buffer-enable ()
 118   (setq riece-shrink-buffer-enabled t))
 119
 120 (defun riece-shrink-buffer-disable ()
 121   (setq riece-shrink-buffer-enabled nil))
 122
 123 (provide 'riece-shrink-buffer)
 124
 125 ;;; riece-shrink-buffer.el ends here