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;;; emacs-lock.el --- prevents you from exiting emacs if a buffer is locked
;; Copyright (C) 1994 Free Software Foundation, Inc
;;
;; Author: Tom Wurgler <twurgler@goodyear.com>
;; Created: 12/8/94
;; Version: 1.3
;; Keywords:
;;
;; This program 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 2 of the License, or
;; (at your option) any later version.
;;
;; This program 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; if not, write to the Free Software
;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
;;; Commentary:
;;
;; This code sets a buffer-local variable to t if toggle-emacs-lock is run,
;; then if the user attempts to exit emacs, the locked buffer name will be
;; displayed and the exit aborted. This is just a way of protecting
;; yourself from yourself. For example, if you have a shell running a big
;; program and exiting emacs would abort that program, you may want to lock
;; that buffer, then if you forget about it after a while, you won't
;; accidently exit emacs. To unlock the buffer, just goto the buffer and
;; run toggle-emacs-lock again.
(defvar lock-emacs-from-exiting nil
"Whether emacs is locked to prevent exiting. See `check-emacs-lock'.")
(make-variable-buffer-local 'lock-emacs-from-exiting)
(defun check-emacs-lock ()
"Check if variable `lock-emacs-from-exiting' is t for any buffer.
If any t is found, signal error and display the locked buffer name."
(let ((buffers (buffer-list)))
(save-excursion
(while buffers
(set-buffer (car buffers))
(if lock-emacs-from-exiting
(error "Emacs is locked from exit due to buffer: %s" (buffer-name))
(setq buffers (cdr buffers)))))))
(defun toggle-emacs-lock ()
"Toggle `lock-emacs-from-exiting' between t and nil for the current buffer.
See `check-emacs-lock'."
(interactive)
(if lock-emacs-from-exiting
(setq lock-emacs-from-exiting nil)
(setq lock-emacs-from-exiting t))
(if lock-emacs-from-exiting
(message "Emacs is now locked from exiting.")
(message "Emacs is now unlocked.")))
(add-hook 'kill-emacs-hook 'check-emacs-lock)
;; emacs-lock.el ends here
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