-;;; emacs-lock.el --- Prevents you from exiting emacs if a buffer is locked
-;; Copyright (C) 1994 Free Software Foundation, Inc
-;;
+;;; emacs-lock.el --- prevents you from exiting emacs if a buffer is locked
+
+;; Copyright (C) 1994, 1997 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
+;; Keywords: extensions, processes
+
+;; 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 2 of the License, or
-;; (at your option) any later version.
-;;
-;; This program is distributed in the hope that it will be useful,
+;; the Free Software Foundation; either version 2, 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; if not, write to the Free Software
-;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+;; 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.
;;; 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
+;; accidentally exit emacs. To unlock the buffer, just goto the buffer and
;; run toggle-emacs-lock again.
-(defvar lock-emacs-from-exiting nil
+;;; Code:
+
+(defvar emacs-lock-from-exiting nil
"Whether emacs is locked to prevent exiting. See `check-emacs-lock'.")
-(make-variable-buffer-local 'lock-emacs-from-exiting)
+(make-variable-buffer-local 'emacs-lock-from-exiting)
+
+(defvar emacs-lock-buffer-locked nil
+ "Whether a shell or telnet buffer was locked when its process was killed.")
+(make-variable-buffer-local 'emacs-lock-buffer-locked)
+(put 'emacs-lock-buffer-locked 'permanent-local t)
(defun check-emacs-lock ()
- "Check if variable `lock-emacs-from-exiting' is t for any buffer.
+ "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
+ (while buffers
(set-buffer (car buffers))
- (if lock-emacs-from-exiting
+ (if emacs-lock-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.
+ "Toggle `emacs-lock-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.")))
+ (if emacs-lock-from-exiting
+ (setq emacs-lock-from-exiting nil)
+ (setq emacs-lock-from-exiting t))
+ (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))))
+
+; 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.
+; 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-shell-sentinel ()
+ (set-process-sentinel
+ (get-buffer-process (buffer-name)) (function emacs-lock-clear-sentinel)))
+
+(defun emacs-lock-clear-sentinel (proc str)
+ (if emacs-lock-from-exiting
+ (progn
+ (setq emacs-lock-from-exiting nil)
+ (setq emacs-lock-buffer-locked t)
+ (message "Buffer is now unlocked"))
+ (setq emacs-lock-buffer-locked nil)))
+
+(defun emacs-lock-was-buffer-locked ()
+ (if emacs-lock-buffer-locked
+ (setq emacs-lock-from-exiting t)))
(add-hook 'kill-emacs-hook 'check-emacs-lock)
+(add-hook 'kill-buffer-hook 'emacs-lock-check-buffer-lock)
+(add-hook 'shell-mode-hook 'emacs-lock-was-buffer-locked)
+(add-hook 'shell-mode-hook 'emacs-lock-shell-sentinel)
+(add-hook 'telnet-mode-hook 'emacs-lock-was-buffer-locked)
+(add-hook 'telnet-mode-hook 'emacs-lock-shell-sentinel)
+
+(provide 'emacs-lock)
-;; emacs-lock.el ends here
+;;; arch-tag: 58e6cb43-7cf0-401a-bcb6-4902a0b8bdc1
+;;; emacs-lock.el ends here
HCoop / bpt / emacs.git / blobdiff