lisp/emacs-lock.el: New file. Old one moved to lisp/obsolete/.

1 files changed, 102 insertions, 0 deletions

diff --git a/lisp/obsolete/old-emacs-lock.el b/lisp/obsolete/old-emacs-lock.el
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+;;; emacs-lock.el --- prevents you from exiting Emacs if a buffer is locked
+
+;; Copyright (C) 1994, 1997, 2001-2011 Free Software Foundation, Inc
+
+;; Author: Tom Wurgler <twurgler@goodyear.com>
+;; Created: 12/8/94
+;; Keywords: extensions, processes
+;; Obsolete-since: 24.1
+
+;; 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; 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 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 `emacs-lock-from-exiting' for the current buffer.
+See `check-emacs-lock'."
+  (interactive)
+  (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)))
+
+(unless noninteractive
+  (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