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107 lines
4.1 KiB
EmacsLisp
107 lines
4.1 KiB
EmacsLisp
;;; emacs-lock.el --- prevents you from exiting emacs if a buffer is locked
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;; Copyright (C) 1994, 1997 Free Software Foundation, Inc
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;; Author: Tom Wurgler <twurgler@goodyear.com>
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;; Created: 12/8/94
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;; Keywords: extensions, processes
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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 2, or (at your option)
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;; 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; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; This code sets a buffer-local variable to t if toggle-emacs-lock is run,
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;; then if the user attempts to exit emacs, the locked buffer name will be
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;; displayed and the exit aborted. This is just a way of protecting
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;; yourself from yourself. For example, if you have a shell running a big
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;; program and exiting emacs would abort that program, you may want to lock
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;; that buffer, then if you forget about it after a while, you won't
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;; accidentally exit emacs. To unlock the buffer, just goto the buffer and
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;; run toggle-emacs-lock again.
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;;; Code:
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(defvar emacs-lock-from-exiting nil
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"Whether emacs is locked to prevent exiting. See `check-emacs-lock'.")
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(make-variable-buffer-local 'emacs-lock-from-exiting)
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(defvar emacs-lock-buffer-locked nil
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"Whether a shell or telnet buffer was locked when its process was killed.")
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(make-variable-buffer-local 'emacs-lock-buffer-locked)
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(put 'emacs-lock-buffer-locked 'permanent-local t)
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(defun check-emacs-lock ()
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"Check if variable `emacs-lock-from-exiting' is t for any buffer.
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If any t is found, signal error and display the locked buffer name."
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(let ((buffers (buffer-list)))
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(save-excursion
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(while buffers
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(set-buffer (car buffers))
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(if emacs-lock-from-exiting
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(error "Emacs is locked from exit due to buffer: %s" (buffer-name))
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(setq buffers (cdr buffers)))))))
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(defun toggle-emacs-lock ()
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"Toggle `emacs-lock-from-exiting' between t and nil for the current buffer.
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See `check-emacs-lock'."
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(interactive)
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(if emacs-lock-from-exiting
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(setq emacs-lock-from-exiting nil)
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(setq emacs-lock-from-exiting t))
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(if emacs-lock-from-exiting
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(message "Buffer is now locked")
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(message "Buffer is now unlocked")))
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(defun emacs-lock-check-buffer-lock ()
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"Check if variable `emacs-lock-from-exiting' is t for a buffer.
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If t is found, signal error and display the locked buffer name."
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(if emacs-lock-from-exiting
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(error "Buffer `%s' is locked, can't delete it" (buffer-name))))
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; These next defuns make it so if you exit a shell that is locked, the lock
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; is shut off for that shell so you can exit emacs. Same for telnet.
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; Also, if a shell or a telnet buffer was locked and the process killed,
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; turn the lock back on again if the process is restarted.
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(defun emacs-lock-shell-sentinel ()
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(set-process-sentinel
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(get-buffer-process (buffer-name)) (function emacs-lock-clear-sentinel)))
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(defun emacs-lock-clear-sentinel (proc str)
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(if emacs-lock-from-exiting
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(progn
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(setq emacs-lock-from-exiting nil)
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(setq emacs-lock-buffer-locked t)
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(message "Buffer is now unlocked"))
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(setq emacs-lock-buffer-locked nil)))
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(defun emacs-lock-was-buffer-locked ()
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(if emacs-lock-buffer-locked
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(setq emacs-lock-from-exiting t)))
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(add-hook 'kill-emacs-hook 'check-emacs-lock)
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(add-hook 'kill-buffer-hook 'emacs-lock-check-buffer-lock)
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(add-hook 'shell-mode-hook 'emacs-lock-was-buffer-locked)
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(add-hook 'shell-mode-hook 'emacs-lock-shell-sentinel)
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(add-hook 'telnet-mode-hook 'emacs-lock-was-buffer-locked)
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(add-hook 'telnet-mode-hook 'emacs-lock-shell-sentinel)
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(provide 'emacs-lock)
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;;; emacs-lock.el ends here
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