-;;; emacs-lock.el --- prevents you from exiting emacs if a buffer is locked
+;;; emacs-lock.el --- prevents you from exiting Emacs if a buffer is locked
-;; Copyright (C) 1994, 1997 Free Software Foundation, Inc
+;; Copyright (C) 1994, 1997, 2001-2011 Free Software Foundation, Inc
;; Author: Tom Wurgler <twurgler@goodyear.com>
;; Created: 12/8/94
-;; Keywords:
+;; Keywords: extensions, processes
;; This file is part of GNU Emacs.
-;; GNU Emacs is free software; you can redistribute it and/or modify
+;; 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 2, or (at your option)
-;; any later version.
+;; the Free Software Foundation, either version 3 of the License, 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
;; 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., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; 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
+;; 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
+;; 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
-;; accidentally exit emacs. To unlock the buffer, just goto the buffer and
+;; accidentally exit Emacs. To unlock the buffer, just goto the buffer and
;; run toggle-emacs-lock again.
;;; Code:
(defvar emacs-lock-from-exiting nil
- "Whether emacs is locked to prevent exiting. See `check-emacs-lock'.")
+ "Whether Emacs is locked to prevent exiting. See `check-emacs-lock'.")
(make-variable-buffer-local 'emacs-lock-from-exiting)
(defvar emacs-lock-buffer-locked nil
(defun check-emacs-lock ()
"Check if variable `emacs-lock-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 emacs-lock-from-exiting
- (error "Emacs is locked from exit due to buffer: %s" (buffer-name))
- (setq buffers (cdr buffers)))))))
+If any locked buffer is found, signal error and display the buffer's name."
+ (save-excursion
+ (dolist (buffer (buffer-list))
+ (set-buffer buffer)
+ (when emacs-lock-from-exiting
+ (error "Emacs is locked from exit due to buffer: %s" (buffer-name))))))
(defun toggle-emacs-lock ()
- "Toggle `emacs-lock-from-exiting' between t and nil for the current buffer.
+ "Toggle `emacs-lock-from-exiting' for the current buffer.
See `check-emacs-lock'."
(interactive)
- (if emacs-lock-from-exiting
- (setq emacs-lock-from-exiting nil)
- (setq emacs-lock-from-exiting t))
+ (setq emacs-lock-from-exiting (not emacs-lock-from-exiting))
(if emacs-lock-from-exiting
(message "Buffer is now locked")
(message "Buffer is now unlocked")))
(defun emacs-lock-check-buffer-lock ()
"Check if variable `emacs-lock-from-exiting' is t for a buffer.
-If t is found, signal error and display the locked buffer name."
- (if emacs-lock-from-exiting
- (error "Buffer `%s' is locked, can't delete it" (buffer-name))))
+If the buffer is locked, signal error and display its name."
+ (when emacs-lock-from-exiting
+ (error "Buffer `%s' is locked, can't delete it" (buffer-name))))
; These next defuns make it so if you exit a shell that is locked, the lock
-; is shut off for that shell so you can exit emacs. same for telnet.
+; is shut off for that shell so you can exit Emacs. Same for telnet.
; Also, if a shell or a telnet buffer was locked and the process killed,
; turn the lock back on again if the process is restarted.
(defun emacs-lock-clear-sentinel (proc str)
(if emacs-lock-from-exiting
(progn
- (setq emacs-lock-from-exiting nil)
+ (setq emacs-lock-from-exiting nil)
(setq emacs-lock-buffer-locked t)
(message "Buffer is now unlocked"))
(setq emacs-lock-buffer-locked nil)))