bc511a64f6
Most of this change is to boilerplate commentary such as license URLs. This change was prompted by ftp://ftp.gnu.org's going-away party, planned for November. Change these FTP URLs to https://ftp.gnu.org instead. Make similar changes for URLs to other organizations moving away from FTP. Also, change HTTP to HTTPS for URLs to gnu.org and fsf.org when this works, as this will further help defend against man-in-the-middle attacks (for this part I omitted the MS-DOS and MS-Windows sources and the test tarballs to keep the workload down). HTTPS is not fully working to lists.gnu.org so I left those URLs alone for now.
102 lines
3.9 KiB
EmacsLisp
102 lines
3.9 KiB
EmacsLisp
;;; emacs-lock.el --- prevents you from exiting Emacs if a buffer is locked
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;; Copyright (C) 1994, 1997, 2001-2017 Free Software Foundation, Inc.
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;; Author: Tom Wurgler <twurgler@goodyear.com>
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;; Created: 12/8/94
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;; Keywords: extensions, processes
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;; Obsolete-since: 24.1
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This code sets a buffer-local variable to t if toggle-emacs-lock is run,
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;; then if the user attempts to exit Emacs, the locked buffer name will be
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;; displayed and the exit aborted. This is just a way of protecting
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;; yourself from yourself. For example, if you have a shell running a big
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;; program and exiting Emacs would abort that program, you may want to lock
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;; that buffer, then if you forget about it after a while, you won't
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;; accidentally exit Emacs. To unlock the buffer, just goto the buffer and
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;; run toggle-emacs-lock again.
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;;; Code:
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(defvar emacs-lock-from-exiting nil
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"Whether Emacs is locked to prevent exiting. See `check-emacs-lock'.")
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(make-variable-buffer-local 'emacs-lock-from-exiting)
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(defvar emacs-lock-buffer-locked nil
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"Whether a shell or telnet buffer was locked when its process was killed.")
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(make-variable-buffer-local 'emacs-lock-buffer-locked)
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(put 'emacs-lock-buffer-locked 'permanent-local t)
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(defun check-emacs-lock ()
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"Check if variable `emacs-lock-from-exiting' is t for any buffer.
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If any locked buffer is found, signal error and display the buffer's name."
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(save-excursion
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(dolist (buffer (buffer-list))
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(set-buffer buffer)
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(when emacs-lock-from-exiting
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(error "Emacs is locked from exit due to buffer: %s" (buffer-name))))))
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(defun toggle-emacs-lock ()
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"Toggle `emacs-lock-from-exiting' for the current buffer.
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See `check-emacs-lock'."
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(interactive)
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(setq emacs-lock-from-exiting (not emacs-lock-from-exiting))
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(if emacs-lock-from-exiting
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(message "Buffer is now locked")
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(message "Buffer is now unlocked")))
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(defun emacs-lock-check-buffer-lock ()
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"Check if variable `emacs-lock-from-exiting' is t for a buffer.
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If the buffer is locked, signal error and display its name."
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(when emacs-lock-from-exiting
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(error "Buffer `%s' is locked, can't delete it" (buffer-name))))
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; These next defuns make it so if you exit a shell that is locked, the lock
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; is shut off for that shell so you can exit Emacs. Same for telnet.
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; Also, if a shell or a telnet buffer was locked and the process killed,
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; turn the lock back on again if the process is restarted.
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(defun emacs-lock-shell-sentinel ()
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(set-process-sentinel
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(get-buffer-process (buffer-name)) (function emacs-lock-clear-sentinel)))
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(defun emacs-lock-clear-sentinel (_proc _str)
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(if emacs-lock-from-exiting
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(progn
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(setq emacs-lock-from-exiting nil)
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(setq emacs-lock-buffer-locked t)
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(message "Buffer is now unlocked"))
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(setq emacs-lock-buffer-locked nil)))
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(defun emacs-lock-was-buffer-locked ()
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(if emacs-lock-buffer-locked
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(setq emacs-lock-from-exiting t)))
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(unless noninteractive
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(add-hook 'kill-emacs-hook 'check-emacs-lock))
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(add-hook 'kill-buffer-hook 'emacs-lock-check-buffer-lock)
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(add-hook 'shell-mode-hook 'emacs-lock-was-buffer-locked)
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(add-hook 'shell-mode-hook 'emacs-lock-shell-sentinel)
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(add-hook 'telnet-mode-hook 'emacs-lock-was-buffer-locked)
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(add-hook 'telnet-mode-hook 'emacs-lock-shell-sentinel)
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(provide 'emacs-lock)
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;;; emacs-lock.el ends here
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