mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-24 07:20:37 +00:00
109 lines
4.1 KiB
EmacsLisp
109 lines
4.1 KiB
EmacsLisp
;;; emacs-lock.el --- prevents you from exiting emacs if a buffer is locked
|
|
|
|
;; Copyright (C) 1994, 1997, 2002, 2003, 2004,
|
|
;; 2005, 2006 Free Software Foundation, Inc
|
|
|
|
;; Author: Tom Wurgler <twurgler@goodyear.com>
|
|
;; Created: 12/8/94
|
|
;; 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, 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; see the file COPYING. If not, write to the
|
|
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
|
;; Boston, MA 02110-1301, USA.
|
|
|
|
;;; 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 t is found, signal error and display the locked buffer name."
|
|
(let ((buffers (buffer-list)))
|
|
(save-excursion
|
|
(while buffers
|
|
(set-buffer (car buffers))
|
|
(if emacs-lock-from-exiting
|
|
(error "Emacs is locked from exit due to buffer: %s" (buffer-name))
|
|
(setq buffers (cdr buffers)))))))
|
|
|
|
(defun toggle-emacs-lock ()
|
|
"Toggle `emacs-lock-from-exiting' between t and nil for the current buffer.
|
|
See `check-emacs-lock'."
|
|
(interactive)
|
|
(if emacs-lock-from-exiting
|
|
(setq emacs-lock-from-exiting nil)
|
|
(setq emacs-lock-from-exiting t))
|
|
(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 t is found, signal error and display the locked buffer name."
|
|
(if 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)
|
|
|
|
;;; arch-tag: 58e6cb43-7cf0-401a-bcb6-4902a0b8bdc1
|
|
;;; emacs-lock.el ends here
|