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c4667a1a | 1 | ;;; emacs-lock.el --- prevents you from exiting Emacs if a buffer is locked |
b578f267 | 2 | |
e91081eb | 3 | ;; Copyright (C) 1994, 1997, 2001, 2002, 2003, 2004, |
409cc4a3 | 4 | ;; 2005, 2006, 2007, 2008 Free Software Foundation, Inc |
b578f267 | 5 | |
c9e2fc17 RS |
6 | ;; Author: Tom Wurgler <twurgler@goodyear.com> |
7 | ;; Created: 12/8/94 | |
1a2b7f51 | 8 | ;; Keywords: extensions, processes |
b578f267 EN |
9 | |
10 | ;; This file is part of GNU Emacs. | |
11 | ||
12 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
c9e2fc17 | 13 | ;; it under the terms of the GNU General Public License as published by |
b4aa6026 | 14 | ;; the Free Software Foundation; either version 3, or (at your option) |
b578f267 EN |
15 | ;; any later version. |
16 | ||
17 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
c9e2fc17 RS |
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. | |
b578f267 | 21 | |
c9e2fc17 | 22 | ;; You should have received a copy of the GNU General Public License |
b578f267 | 23 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
086add15 LK |
24 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
25 | ;; Boston, MA 02110-1301, USA. | |
c9e2fc17 RS |
26 | |
27 | ;;; Commentary: | |
b578f267 | 28 | |
c9e2fc17 | 29 | ;; This code sets a buffer-local variable to t if toggle-emacs-lock is run, |
c4667a1a | 30 | ;; then if the user attempts to exit Emacs, the locked buffer name will be |
c9e2fc17 RS |
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 | |
c4667a1a | 33 | ;; program and exiting Emacs would abort that program, you may want to lock |
c9e2fc17 | 34 | ;; that buffer, then if you forget about it after a while, you won't |
c4667a1a | 35 | ;; accidentally exit Emacs. To unlock the buffer, just goto the buffer and |
c9e2fc17 RS |
36 | ;; run toggle-emacs-lock again. |
37 | ||
b578f267 EN |
38 | ;;; Code: |
39 | ||
0333a1cc | 40 | (defvar emacs-lock-from-exiting nil |
8ee47e4a | 41 | "Whether Emacs is locked to prevent exiting. See `check-emacs-lock'.") |
0333a1cc RS |
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) | |
c9e2fc17 RS |
48 | |
49 | (defun check-emacs-lock () | |
0333a1cc | 50 | "Check if variable `emacs-lock-from-exiting' is t for any buffer. |
c4667a1a JB |
51 | If 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)))))) | |
c9e2fc17 RS |
57 | |
58 | (defun toggle-emacs-lock () | |
c4667a1a | 59 | "Toggle `emacs-lock-from-exiting' for the current buffer. |
c9e2fc17 RS |
60 | See `check-emacs-lock'." |
61 | (interactive) | |
c4667a1a | 62 | (setq emacs-lock-from-exiting (not emacs-lock-from-exiting)) |
0333a1cc RS |
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. | |
c4667a1a JB |
69 | If 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)))) | |
0333a1cc RS |
72 | |
73 | ; These next defuns make it so if you exit a shell that is locked, the lock | |
c4667a1a | 74 | ; is shut off for that shell so you can exit Emacs. Same for telnet. |
0333a1cc RS |
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 | |
a09aa659 | 85 | (setq emacs-lock-from-exiting nil) |
0333a1cc RS |
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))) | |
c9e2fc17 RS |
93 | |
94 | (add-hook 'kill-emacs-hook 'check-emacs-lock) | |
0333a1cc RS |
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) | |
c9e2fc17 | 102 | |
cbee283d | 103 | ;; arch-tag: 58e6cb43-7cf0-401a-bcb6-4902a0b8bdc1 |
0333a1cc | 104 | ;;; emacs-lock.el ends here |