X-Git-Url: https://code.delx.au/gnu-emacs/blobdiff_plain/ad837797de652021a470c5a5c0f1165709df7528..0d4afaf7ffb6d1881c9acf9ef03f386cc87254e6:/lisp/emacs-lock.el diff --git a/lisp/emacs-lock.el b/lisp/emacs-lock.el index 2a0f3a04f3..906b899bed 100644 --- a/lisp/emacs-lock.el +++ b/lisp/emacs-lock.el @@ -1,62 +1,102 @@ -;;; 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, 2001, 2002, 2003, 2004, +;; 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc + ;; Author: Tom Wurgler ;; 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 +;; the Free Software Foundation, either version 3 of the License, or ;; (at your option) any later version. -;; -;; This program is distributed in the hope that it will be useful, + +;; 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. If not, see . ;;; 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 +;; 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 +;; 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 - "Whether emacs is locked to prevent exiting. See `check-emacs-lock'.") -(make-variable-buffer-local 'lock-emacs-from-exiting) +;;; 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 `lock-emacs-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 lock-emacs-from-exiting - (error "Emacs is locked from exit due to buffer: %s" (buffer-name)) - (setq buffers (cdr buffers))))))) + "Check if variable `emacs-lock-from-exiting' is t for any buffer. +If any locked buffer is found, signal error and display the buffer's name." + (save-excursion + (dolist (buffer (buffer-list)) + (set-buffer buffer) + (when emacs-lock-from-exiting + (error "Emacs is locked from exit due to buffer: %s" (buffer-name)))))) (defun toggle-emacs-lock () - "Toggle `lock-emacs-from-exiting' between t and nil for the current buffer. + "Toggle `emacs-lock-from-exiting' 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."))) + (setq emacs-lock-from-exiting (not emacs-lock-from-exiting)) + (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 the buffer is locked, signal error and display its name." + (when 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