1;;; emacs-lock.el --- prevents you from exiting Emacs if a buffer is locked 2 3;; Copyright (C) 1994, 1997, 2001, 2002, 2003, 2004, 4;; 2005, 2006, 2007 Free Software Foundation, Inc 5 6;; Author: Tom Wurgler <twurgler@goodyear.com> 7;; Created: 12/8/94 8;; Keywords: extensions, processes 9 10;; This file is part of GNU Emacs. 11 12;; GNU Emacs is free software; you can redistribute it and/or modify 13;; it under the terms of the GNU General Public License as published by 14;; the Free Software Foundation; either version 2, or (at your option) 15;; any later version. 16 17;; GNU Emacs is distributed in the hope that it will be useful, 18;; but WITHOUT ANY WARRANTY; without even the implied warranty of 19;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20;; GNU General Public License for more details. 21 22;; You should have received a copy of the GNU General Public License 23;; along with GNU Emacs; see the file COPYING. If not, write to the 24;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 25;; Boston, MA 02110-1301, USA. 26 27;;; Commentary: 28 29;; This code sets a buffer-local variable to t if toggle-emacs-lock is run, 30;; then if the user attempts to exit Emacs, the locked buffer name will be 31;; displayed and the exit aborted. This is just a way of protecting 32;; yourself from yourself. For example, if you have a shell running a big 33;; program and exiting Emacs would abort that program, you may want to lock 34;; that buffer, then if you forget about it after a while, you won't 35;; accidentally exit Emacs. To unlock the buffer, just goto the buffer and 36;; run toggle-emacs-lock again. 37 38;;; Code: 39 40(defvar emacs-lock-from-exiting nil 41 "Whether Emacs is locked to prevent exiting. See `check-emacs-lock'.") 42(make-variable-buffer-local 'emacs-lock-from-exiting) 43 44(defvar emacs-lock-buffer-locked nil 45 "Whether a shell or telnet buffer was locked when its process was killed.") 46(make-variable-buffer-local 'emacs-lock-buffer-locked) 47(put 'emacs-lock-buffer-locked 'permanent-local t) 48 49(defun check-emacs-lock () 50 "Check if variable `emacs-lock-from-exiting' is t for any buffer. 51If any locked buffer is found, signal error and display the buffer's name." 52 (save-excursion 53 (dolist (buffer (buffer-list)) 54 (set-buffer buffer) 55 (when emacs-lock-from-exiting 56 (error "Emacs is locked from exit due to buffer: %s" (buffer-name)))))) 57 58(defun toggle-emacs-lock () 59 "Toggle `emacs-lock-from-exiting' for the current buffer. 60See `check-emacs-lock'." 61 (interactive) 62 (setq emacs-lock-from-exiting (not emacs-lock-from-exiting)) 63 (if emacs-lock-from-exiting 64 (message "Buffer is now locked") 65 (message "Buffer is now unlocked"))) 66 67(defun emacs-lock-check-buffer-lock () 68 "Check if variable `emacs-lock-from-exiting' is t for a buffer. 69If the buffer is locked, signal error and display its name." 70 (when emacs-lock-from-exiting 71 (error "Buffer `%s' is locked, can't delete it" (buffer-name)))) 72 73; These next defuns make it so if you exit a shell that is locked, the lock 74; is shut off for that shell so you can exit Emacs. Same for telnet. 75; Also, if a shell or a telnet buffer was locked and the process killed, 76; turn the lock back on again if the process is restarted. 77 78(defun emacs-lock-shell-sentinel () 79 (set-process-sentinel 80 (get-buffer-process (buffer-name)) (function emacs-lock-clear-sentinel))) 81 82(defun emacs-lock-clear-sentinel (proc str) 83 (if emacs-lock-from-exiting 84 (progn 85 (setq emacs-lock-from-exiting nil) 86 (setq emacs-lock-buffer-locked t) 87 (message "Buffer is now unlocked")) 88 (setq emacs-lock-buffer-locked nil))) 89 90(defun emacs-lock-was-buffer-locked () 91 (if emacs-lock-buffer-locked 92 (setq emacs-lock-from-exiting t))) 93 94(add-hook 'kill-emacs-hook 'check-emacs-lock) 95(add-hook 'kill-buffer-hook 'emacs-lock-check-buffer-lock) 96(add-hook 'shell-mode-hook 'emacs-lock-was-buffer-locked) 97(add-hook 'shell-mode-hook 'emacs-lock-shell-sentinel) 98(add-hook 'telnet-mode-hook 'emacs-lock-was-buffer-locked) 99(add-hook 'telnet-mode-hook 'emacs-lock-shell-sentinel) 100 101(provide 'emacs-lock) 102 103;;; arch-tag: 58e6cb43-7cf0-401a-bcb6-4902a0b8bdc1 104;;; emacs-lock.el ends here 105