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119 lines
4.2 KiB
EmacsLisp
119 lines
4.2 KiB
EmacsLisp
;;; erc-truncate.el --- Functions for truncating ERC buffers
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;; Copyright (C) 2003-2004, 2006-2019 Free Software Foundation, Inc.
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;; Author: Andreas Fuchs <asf@void.at>
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;; Maintainer: emacs-devel@gnu.org
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;; Keywords: IRC, chat, client, Internet, logging
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This implements buffer truncation (and optional log file writing
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;; support for the Emacs IRC client. Use `erc-truncate-mode' to switch
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;; on. Use `erc-enable-logging' to enable logging of the stuff which
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;; is getting truncated.
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;;; Code:
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(require 'erc)
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(defgroup erc-truncate nil
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"Truncate buffers when they reach a certain size"
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:group 'erc)
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(defcustom erc-max-buffer-size 30000
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"Maximum size in chars of each ERC buffer.
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Used only when auto-truncation is enabled.
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\(see `erc-truncate-buffer' and `erc-insert-post-hook')."
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:group 'erc-truncate
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:type 'integer)
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;;;###autoload(autoload 'erc-truncate-mode "erc-truncate" nil t)
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(define-erc-module truncate nil
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"Truncate a query buffer if it gets too large.
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This prevents the query buffer from getting too large, which can
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bring any grown Emacs to its knees after a few days worth of
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tracking heavy-traffic channels."
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;;enable
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((add-hook 'erc-insert-post-hook 'erc-truncate-buffer))
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;; disable
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((remove-hook 'erc-insert-post-hook 'erc-truncate-buffer)))
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;;;###autoload
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(defun erc-truncate-buffer-to-size (size &optional buffer)
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"Truncates the buffer to the size SIZE.
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If BUFFER is not provided, the current buffer is assumed. The deleted
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region is logged if `erc-logging-enabled' returns non-nil."
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;; If buffer is non-nil, but get-buffer does not return anything,
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;; then this is a bug. If buffer is a buffer name, get the buffer
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;; object. If buffer is nil, use the current buffer.
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(if (not buffer)
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(setq buffer (current-buffer))
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(unless (get-buffer buffer)
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(error "erc-truncate-buffer-to-size: %S is not a buffer" buffer)))
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(when (> (buffer-size buffer) (+ size 512))
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(with-current-buffer buffer
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;; Note that when erc-insert-post-hook runs, the buffer is
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;; narrowed to the new message. So do this delicate widening.
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;; I am not sure, I think this was not recommended behavior in
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;; Emacs 20.
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(save-restriction
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(widen)
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(let ((end (- erc-insert-marker size)))
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;; truncate at line boundaries
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(goto-char end)
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(beginning-of-line)
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(setq end (point))
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;; try to save the current buffer using
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;; `erc-save-buffer-in-logs'. We use this, in case the
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;; user has both `erc-save-buffer-in-logs' and
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;; `erc-truncate-buffer' in `erc-insert-post-hook'. If
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;; this is the case, only the non-saved part of the current
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;; buffer should be saved. Rather than appending the
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;; deleted part of the buffer to the log file.
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;;
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;; Alternatively this could be made conditional on:
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;; (not (memq 'erc-save-buffer-in-logs
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;; erc-insert-post-hook))
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;; Comments?
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(when (and (boundp 'erc-enable-logging)
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erc-enable-logging
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(erc-logging-enabled buffer))
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(erc-save-buffer-in-logs))
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;; disable undoing for the truncating
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(buffer-disable-undo)
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(let ((inhibit-read-only t))
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(delete-region (point-min) end)))
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(buffer-enable-undo)))))
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;;;###autoload
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(defun erc-truncate-buffer ()
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"Truncates the current buffer to `erc-max-buffer-size'.
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Meant to be used in hooks, like `erc-insert-post-hook'."
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(interactive)
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(erc-truncate-buffer-to-size erc-max-buffer-size))
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(provide 'erc-truncate)
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;;; erc-truncate.el ends here
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;;
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;; Local Variables:
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;; generated-autoload-file: "erc-loaddefs.el"
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;; indent-tabs-mode: t
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;; tab-width: 8
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;; End:
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