emacs/lisp/obsolete/old-emacs-lock.el

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;;; old-emacs-lock.el --- prevents you from exiting Emacs if a buffer is locked -*- lexical-binding: t; -*-
;; Copyright (C) 1994, 1997, 2001-2021 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 <https://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
* lisp/obsolete: Use lexical-binding Use lexical-binding in all the lisp/obsolete/*.el files. While at it, removed redundant :group arguments and used #' to quote functions. Commented out the key bindings which the #' revealed to lead to non-existing commands, and replaced those revealed to be obsolete. * lisp/obsolete/cl-compat.el: Use cl-lib. * lisp/obsolete/cust-print.el: Assume `defalias` exists. (with-custom-print): Use `declare`. * lisp/obsolete/iswitchb.el (iswitchb-init-XEmacs-trick) (iswitchb-xemacs-backspacekey): Remove functions. * lisp/obsolete/landmark.el (landmark, landmark-nslify-wts): Prefer `apply` to `eval`. * lisp/obsolete/longlines.el (longlines-mode): Don't use `add-to-list` on a hook. * lisp/obsolete/pgg-gpg.el (pgg-gpg-process-region): Use `clear-string`. * lisp/obsolete/pgg-pgp.el (pgg-pgp-encrypt-region): Remove oddly unused var `passphrase`. (pgg-pgp-verify-region): Declare var `jam-zcat-filename-list`. * lisp/obsolete/pgg-pgp5.el (pgg-pgp5-encrypt-region): Remove oddly unused var `passphrase`. (pgg-pgp5-verify-region): Declare var `jam-zcat-filename-list`. * lisp/obsolete/pgg.el: Remove some XEmacs compatibility code. (pgg-run-at-time, pgg-cancel-timer, pgg-clear-string): Remove functions. Use their core equivalent instead. * lisp/obsolete/rcompile.el (remote-compile): Remove unused vars `l`, `l-host`, `l-user`, and `localname`. * lisp/obsolete/starttls.el (starttls-any-program-available): Use `define-obsolete-function-alias`. * lisp/obsolete/tls.el (tls-format-message): Delete function, use `format-message` instead. * lisp/obsolete/url-ns.el (url-ns-prefs): Use `with-current-buffer` and `dlet`. * lisp/obsolete/vip.el (vip-escape-to-emacs): Remove unused var `key`. (vip-command-argument, vip-read-string, ex-delete, ex-line): Remove unused var `conditions`. (ex-map): Use a closure instead of `eval`. (ex-set): Make it an alias of `set-variable`. (ex-substitute): Remove unused var `cont`. * lisp/obsolete/abbrevlist.el: * lisp/obsolete/bruce.el: * lisp/obsolete/cc-compat.el: * lisp/obsolete/cl-compat.el: * lisp/obsolete/cl.el: * lisp/obsolete/complete.el: * lisp/obsolete/crisp.el: * lisp/obsolete/cust-print.el: * lisp/obsolete/erc-compat.el: * lisp/obsolete/erc-hecomplete.el: * lisp/obsolete/eudcb-ph.el: * lisp/obsolete/fast-lock.el: * lisp/obsolete/gs.el: * lisp/obsolete/gulp.el: * lisp/obsolete/html2text.el: * lisp/obsolete/info-edit.el: * lisp/obsolete/iswitchb.el: * lisp/obsolete/landmark.el: * lisp/obsolete/lazy-lock.el: * lisp/obsolete/longlines.el: * lisp/obsolete/mailpost.el: * lisp/obsolete/mantemp.el: * lisp/obsolete/meese.el: * lisp/obsolete/messcompat.el: * lisp/obsolete/metamail.el: * lisp/obsolete/mouse-sel.el: * lisp/obsolete/nnir.el: * lisp/obsolete/old-emacs-lock.el: * lisp/obsolete/otodo-mode.el: * lisp/obsolete/patcomp.el: * lisp/obsolete/pc-mode.el: * lisp/obsolete/pc-select.el: * lisp/obsolete/pgg-def.el: * lisp/obsolete/pgg-gpg.el: * lisp/obsolete/pgg-parse.el: * lisp/obsolete/pgg-pgp.el: * lisp/obsolete/pgg-pgp5.el: * lisp/obsolete/pgg.el: * lisp/obsolete/rcompile.el: * lisp/obsolete/s-region.el: * lisp/obsolete/sb-image.el: * lisp/obsolete/sregex.el: * lisp/obsolete/starttls.el: * lisp/obsolete/sup-mouse.el: * lisp/obsolete/terminal.el: * lisp/obsolete/tls.el: * lisp/obsolete/tpu-edt.el: * lisp/obsolete/tpu-extras.el: * lisp/obsolete/tpu-mapper.el: * lisp/obsolete/url-ns.el: * lisp/obsolete/vc-arch.el: * lisp/obsolete/vi.el: * lisp/obsolete/vip.el: * lisp/obsolete/ws-mode.el: * lisp/obsolete/yow.el: Use lexical-binding.
2021-02-22 16:54:59 -05:00
(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)
;;; old-emacs-lock.el ends here