[Emacs-diffs] Changes to emacs/lisp/emacs-lock.el [lexbind]

[Miles Bader]

Index: emacs/lisp/emacs-lock.el
diff -c /dev/null emacs/lisp/emacs-lock.el:1.8.18.1
*** /dev/null   Tue Oct 14 19:51:46 2003
--- emacs/lisp/emacs-lock.el    Tue Oct 14 19:51:00 2003
***************
*** 0 ****
--- 1,107 ----
+ ;;; emacs-lock.el --- prevents you from exiting emacs if a buffer is locked
+ 
+ ;; Copyright (C) 1994, 1997 Free Software Foundation, Inc
+ 
+ ;; Author: Tom Wurgler <address@hidden>
+ ;; Created: 12/8/94
+ ;; 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, 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; 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
+ ;; 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'.")
+ (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 `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)))))))
+ 
+ (defun toggle-emacs-lock ()
+   "Toggle `emacs-lock-from-exiting' between t and nil 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))
+   (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)
+ 
+ ;;; arch-tag: 58e6cb43-7cf0-401a-bcb6-4902a0b8bdc1
+ ;;; emacs-lock.el ends here