122 lines
4.3 KiB
EmacsLisp
122 lines
4.3 KiB
EmacsLisp
;;; erc-truncate.el --- Functions for truncating ERC buffers
|
|
|
|
;; Copyright (C) 2003, 2004, 2006, 2007, 2008 Free Software Foundation, Inc.
|
|
|
|
;; Author: Andreas Fuchs <asf@void.at>
|
|
;; Keywords: IRC, chat, client, Internet, logging
|
|
|
|
;; This file is part of GNU Emacs.
|
|
|
|
;; GNU Emacs is free software; you can redistribute it and/or modify
|
|
;; it under the terms of the GNU General Public License as published by
|
|
;; the Free Software Foundation; either version 3, or (at your option)
|
|
;; any later version.
|
|
|
|
;; GNU Emacs is distributed in the hope that it will be useful,
|
|
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
;; GNU General Public License for more details.
|
|
|
|
;; You should have received a copy of the GNU General Public License
|
|
;; along with GNU Emacs; see the file COPYING. If not, write to the
|
|
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
|
;; Boston, MA 02110-1301, USA.
|
|
|
|
;;; Commentary:
|
|
|
|
;; This implements buffer truncation (and optional log file writing
|
|
;; support for the Emacs IRC client. Use `erc-truncate-mode' to switch
|
|
;; on. Use `erc-enable-logging' to enable logging of the stuff which
|
|
;; is getting truncated.
|
|
|
|
;;; Code:
|
|
|
|
(require 'erc)
|
|
|
|
(defgroup erc-truncate nil
|
|
"Truncate buffers when they reach a certain size"
|
|
:group 'erc)
|
|
|
|
(defcustom erc-max-buffer-size 30000
|
|
"*Maximum size in chars of each ERC buffer.
|
|
Used only when auto-truncation is enabled.
|
|
\(see `erc-truncate-buffer' and `erc-insert-post-hook')."
|
|
:group 'erc-truncate
|
|
:type 'integer)
|
|
|
|
;;;###autoload (autoload 'erc-truncate-mode "erc-truncate" nil t)
|
|
(define-erc-module truncate nil
|
|
"Truncate a query buffer if it gets too large.
|
|
This prevents the query buffer from getting too large, which can
|
|
bring any grown Emacs to its knees after a few days worth of
|
|
tracking heavy-traffic channels."
|
|
;;enable
|
|
((add-hook 'erc-insert-post-hook 'erc-truncate-buffer))
|
|
;; disable
|
|
((remove-hook 'erc-insert-post-hook 'erc-truncate-buffer)))
|
|
|
|
;;;###autoload
|
|
(defun erc-truncate-buffer-to-size (size &optional buffer)
|
|
"Truncates the buffer to the size SIZE.
|
|
If BUFFER is not provided, the current buffer is assumed. The deleted
|
|
region is logged if `erc-logging-enabled' returns non-nil."
|
|
;; If buffer is non-nil, but get-buffer does not return anything,
|
|
;; then this is a bug. If buffer is a buffer name, get the buffer
|
|
;; object. If buffer is nil, use the current buffer.
|
|
(if (not buffer)
|
|
(setq buffer (current-buffer))
|
|
(unless (get-buffer buffer)
|
|
(error "erc-truncate-buffer-to-size: %S is not a buffer" buffer)))
|
|
(when (> (buffer-size buffer) (+ size 512))
|
|
(save-excursion
|
|
(set-buffer buffer)
|
|
;; Note that when erc-insert-post-hook runs, the buffer is
|
|
;; narrowed to the new message. So do this delicate widening.
|
|
;; I am not sure, I think this was not recommended behaviour in
|
|
;; Emacs 20.
|
|
(save-restriction
|
|
(widen)
|
|
(let ((end (- erc-insert-marker size)))
|
|
;; truncate at line boundaries
|
|
(goto-char end)
|
|
(beginning-of-line)
|
|
(setq end (point))
|
|
;; try to save the current buffer using
|
|
;; `erc-save-buffer-in-logs'. We use this, in case the
|
|
;; user has both `erc-save-buffer-in-logs' and
|
|
;; `erc-truncate-buffer' in `erc-insert-post-hook'. If
|
|
;; this is the case, only the non-saved part of the current
|
|
;; buffer should be saved. Rather than appending the
|
|
;; deleted part of the buffer to the log file.
|
|
;;
|
|
;; Alternatively this could be made conditional on:
|
|
;; (not (memq 'erc-save-buffer-in-logs
|
|
;; erc-insert-post-hook))
|
|
;; Comments?
|
|
(when (and (boundp 'erc-enable-logging)
|
|
erc-enable-logging
|
|
(erc-logging-enabled buffer))
|
|
(erc-save-buffer-in-logs))
|
|
;; disable undoing for the truncating
|
|
(buffer-disable-undo)
|
|
(let ((inhibit-read-only t))
|
|
(delete-region (point-min) end)))
|
|
(buffer-enable-undo)))))
|
|
|
|
;;;###autoload
|
|
(defun erc-truncate-buffer ()
|
|
"Truncates the current buffer to `erc-max-buffer-size'.
|
|
Meant to be used in hooks, like `erc-insert-post-hook'."
|
|
(interactive)
|
|
(erc-truncate-buffer-to-size erc-max-buffer-size))
|
|
|
|
(provide 'erc-truncate)
|
|
;;; erc-truncate.el ends here
|
|
;;
|
|
;; Local Variables:
|
|
;; indent-tabs-mode: t
|
|
;; tab-width: 8
|
|
;; End:
|
|
|
|
;; arch-tag: 22a2ea78-871f-4870-8f1e-efe534170311
|