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be010748 | 1 | ;;; emacs-lock.el --- prevents you from exiting emacs if a buffer is locked |
b578f267 | 2 | |
0333a1cc | 3 | ;; Copyright (C) 1994, 1997 Free Software Foundation, Inc |
b578f267 | 4 | |
c9e2fc17 RS |
5 | ;; Author: Tom Wurgler <twurgler@goodyear.com> |
6 | ;; Created: 12/8/94 | |
1a2b7f51 | 7 | ;; Keywords: extensions, processes |
b578f267 EN |
8 | |
9 | ;; This file is part of GNU Emacs. | |
10 | ||
11 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
c9e2fc17 | 12 | ;; it under the terms of the GNU General Public License as published by |
b578f267 EN |
13 | ;; the Free Software Foundation; either version 2, or (at your option) |
14 | ;; any later version. | |
15 | ||
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
c9e2fc17 RS |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
b578f267 | 20 | |
c9e2fc17 | 21 | ;; You should have received a copy of the GNU General Public License |
b578f267 EN |
22 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
23 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
24 | ;; Boston, MA 02111-1307, USA. | |
c9e2fc17 RS |
25 | |
26 | ;;; Commentary: | |
b578f267 | 27 | |
c9e2fc17 RS |
28 | ;; This code sets a buffer-local variable to t if toggle-emacs-lock is run, |
29 | ;; then if the user attempts to exit emacs, the locked buffer name will be | |
30 | ;; displayed and the exit aborted. This is just a way of protecting | |
31 | ;; yourself from yourself. For example, if you have a shell running a big | |
32 | ;; program and exiting emacs would abort that program, you may want to lock | |
33 | ;; that buffer, then if you forget about it after a while, you won't | |
a7acbbe4 | 34 | ;; accidentally exit emacs. To unlock the buffer, just goto the buffer and |
c9e2fc17 RS |
35 | ;; run toggle-emacs-lock again. |
36 | ||
b578f267 EN |
37 | ;;; Code: |
38 | ||
0333a1cc | 39 | (defvar emacs-lock-from-exiting nil |
c9e2fc17 | 40 | "Whether emacs is locked to prevent exiting. See `check-emacs-lock'.") |
0333a1cc RS |
41 | (make-variable-buffer-local 'emacs-lock-from-exiting) |
42 | ||
43 | (defvar emacs-lock-buffer-locked nil | |
44 | "Whether a shell or telnet buffer was locked when its process was killed.") | |
45 | (make-variable-buffer-local 'emacs-lock-buffer-locked) | |
46 | (put 'emacs-lock-buffer-locked 'permanent-local t) | |
c9e2fc17 RS |
47 | |
48 | (defun check-emacs-lock () | |
0333a1cc | 49 | "Check if variable `emacs-lock-from-exiting' is t for any buffer. |
c9e2fc17 RS |
50 | If any t is found, signal error and display the locked buffer name." |
51 | (let ((buffers (buffer-list))) | |
52 | (save-excursion | |
0333a1cc | 53 | (while buffers |
c9e2fc17 | 54 | (set-buffer (car buffers)) |
0333a1cc | 55 | (if emacs-lock-from-exiting |
c9e2fc17 RS |
56 | (error "Emacs is locked from exit due to buffer: %s" (buffer-name)) |
57 | (setq buffers (cdr buffers))))))) | |
58 | ||
59 | (defun toggle-emacs-lock () | |
0333a1cc | 60 | "Toggle `emacs-lock-from-exiting' between t and nil for the current buffer. |
c9e2fc17 RS |
61 | See `check-emacs-lock'." |
62 | (interactive) | |
0333a1cc RS |
63 | (if emacs-lock-from-exiting |
64 | (setq emacs-lock-from-exiting nil) | |
65 | (setq emacs-lock-from-exiting t)) | |
66 | (if emacs-lock-from-exiting | |
67 | (message "Buffer is now locked") | |
68 | (message "Buffer is now unlocked"))) | |
69 | ||
70 | (defun emacs-lock-check-buffer-lock () | |
71 | "Check if variable `emacs-lock-from-exiting' is t for a buffer. | |
72 | If t is found, signal error and display the locked buffer name." | |
73 | (if emacs-lock-from-exiting | |
74 | (error "Buffer `%s' is locked, can't delete it" (buffer-name)))) | |
75 | ||
76 | ; These next defuns make it so if you exit a shell that is locked, the lock | |
a09aa659 | 77 | ; is shut off for that shell so you can exit emacs. Same for telnet. |
0333a1cc RS |
78 | ; Also, if a shell or a telnet buffer was locked and the process killed, |
79 | ; turn the lock back on again if the process is restarted. | |
80 | ||
81 | (defun emacs-lock-shell-sentinel () | |
82 | (set-process-sentinel | |
83 | (get-buffer-process (buffer-name)) (function emacs-lock-clear-sentinel))) | |
84 | ||
85 | (defun emacs-lock-clear-sentinel (proc str) | |
86 | (if emacs-lock-from-exiting | |
87 | (progn | |
a09aa659 | 88 | (setq emacs-lock-from-exiting nil) |
0333a1cc RS |
89 | (setq emacs-lock-buffer-locked t) |
90 | (message "Buffer is now unlocked")) | |
91 | (setq emacs-lock-buffer-locked nil))) | |
92 | ||
93 | (defun emacs-lock-was-buffer-locked () | |
94 | (if emacs-lock-buffer-locked | |
95 | (setq emacs-lock-from-exiting t))) | |
c9e2fc17 RS |
96 | |
97 | (add-hook 'kill-emacs-hook 'check-emacs-lock) | |
0333a1cc RS |
98 | (add-hook 'kill-buffer-hook 'emacs-lock-check-buffer-lock) |
99 | (add-hook 'shell-mode-hook 'emacs-lock-was-buffer-locked) | |
100 | (add-hook 'shell-mode-hook 'emacs-lock-shell-sentinel) | |
101 | (add-hook 'telnet-mode-hook 'emacs-lock-was-buffer-locked) | |
102 | (add-hook 'telnet-mode-hook 'emacs-lock-shell-sentinel) | |
103 | ||
104 | (provide 'emacs-lock) | |
c9e2fc17 | 105 | |
0333a1cc | 106 | ;;; emacs-lock.el ends here |