Commit 53bbe3ad authored by Juanma Barranquero's avatar Juanma Barranquero

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

parent 0d939f40
2011-07-05 Juanma Barranquero <lekktu@gmail.com>
* NEWS: Document new emacs-lock.el and renaming of old one.
2011-07-05 Manoj Srivastava <srivasta@ieee.org>
* themes/manoj-dark-theme.el (manoj-dark): New file.
......
......@@ -857,6 +857,13 @@ soap-inspect.el is an interactive inspector for SOAP WSDL structures.
** xmodmap-generic-mode for xmodmap files.
** New emacs-lock.el package.
(The pre-existing one has been renamed to old-emacs-lock.el and moved
to obsolete/.) Now, Emacs Lock is a proper minor mode
`emacs-lock-mode'. Protection against exiting Emacs and killing the
buffer can be set separately. The mechanism for auto turning off
protection for buffers with inferior processes has been generalized.
* Incompatible Lisp Changes in Emacs 24.1
......
2011-07-05 Juanma Barranquero <lekktu@gmail.com>
* obsolete/old-emacs-lock.el: Rename from emacs-lock.el.
* emacs-lock.el: New file.
2011-07-05 Julien Danjou <julien@danjou.info>
* textmodes/rst.el (rst-define-level-faces): Use `facep' rather
......
;;; emacs-lock.el --- prevents you from exiting Emacs if a buffer is locked
;;; emacs-lock.el --- protect buffers against killing or exiting -*- lexical-binding: t -*-
;; Copyright (C) 1994, 1997, 2001-2011 Free Software Foundation, Inc
;; Copyright (C) 2011 Free Software Foundation, Inc
;; Author: Tom Wurgler <twurgler@goodyear.com>
;; Created: 12/8/94
;; Author: Juanma Barranquero <lekktu@gmail.com>
;; Inspired by emacs-lock.el by Tom Wurgler <twurgler@goodyear.com>
;; Maintainer: FSF
;; Keywords: extensions, processes
;; This file is part of GNU Emacs.
......@@ -23,79 +24,217 @@
;;; 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.
;; This package defines a minor mode Emacs Lock to mark a buffer as
;; protected against accidental killing, or exiting Emacs, or both.
;; Buffers associated with inferior modes, like shell or telnet, can
;; be treated specially, by auto-unlocking them if their interior
;; processes are dead.
;;; 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)
(defgroup emacs-lock nil
"Emacs-Lock mode."
:version "24.1"
:group 'convenience)
(defcustom emacs-lock-default-locking-mode 'all
"Default locking mode of Emacs-Locked buffers.
Its value is used as the default for `emacs-lock-mode' (which
see) the first time that Emacs Lock mode is turned on in a buffer
without passing an explicit locking mode.
Possible values are:
exit -- Emacs cannot exit while the buffer is locked
kill -- the buffer cannot be killed, but Emacs can exit as usual
all -- the buffer is locked against both actions
nil -- the buffer is not locked"
:type '(choice
(const :tag "Do not allow Emacs to exit" exit)
(const :tag "Do not allow killing the buffer" kill)
(const :tag "Do not allow killing the buffer or exiting Emacs" all)
(const :tag "Do not lock the buffer" nil))
:group 'emacs-lock
:version "24.1")
;; Note: as auto-unlocking can lead to data loss, it would be better
;; to default to nil; but the value below is for compatibility with
;; the old emacs-lock.el.
(defcustom emacs-lock-unlockable-modes '((shell-mode . all)
(telnet-mode . all))
"Alist of auto-unlockable modes.
Each element is a pair (MAJOR-MODE . ACTION), where ACTION is
one of `kill', `exit' or `all'. Buffers with matching major
modes are auto-unlocked for the specific action if their
inferior processes are not alive. If this variable is t, all
buffers associated to inferior processes are auto-unlockable
for both actions (NOT RECOMMENDED)."
:type '(choice
(const :tag "All buffers with inferior processes" t)
(repeat :tag "Selected modes"
(cons :tag "Set auto-unlock for"
(symbol :tag "Major mode")
(radio
(const :tag "Allow exiting" exit)
(const :tag "Allow killing" kill)
(const :tag "Allow both" all)))))
:group 'emacs-lock
:version "24.1")
(defvar emacs-lock-mode nil
"If non-nil, the current buffer is locked.
It can be one of the following values:
exit -- Emacs cannot exit while the buffer is locked
kill -- the buffer cannot be killed, but Emacs can exit as usual
all -- the buffer is locked against both actions
nil -- the buffer is not locked")
(make-variable-buffer-local 'emacs-lock-mode)
(put 'emacs-lock-mode 'permanent-local t)
(defvar emacs-lock--old-mode nil
"Most recent locking mode set on the buffer.
Internal use only.")
(make-variable-buffer-local 'emacs-lock--old-mode)
(put 'emacs-lock--old-mode 'permanent-local t)
(defvar emacs-lock--try-unlocking nil
"Non-nil if current buffer should be checked for auto-unlocking.
Internal use only.")
(make-variable-buffer-local 'emacs-lock--try-unlocking)
(put 'emacs-lock--try-unlocking 'permanent-local t)
(defun emacs-lock-live-process-p (buffer-or-name)
"Return t if BUFFER-OR-NAME is associated with a live process."
(let ((proc (get-buffer-process buffer-or-name)))
(and proc (process-live-p proc))))
(defun emacs-lock--can-auto-unlock (action)
"Return t if the current buffer can auto-unlock for ACTION.
ACTION must be one of `kill' or `exit'.
See `emacs-lock-unlockable-modes'."
(and emacs-lock--try-unlocking
(not (emacs-lock-live-process-p (current-buffer)))
(or (eq emacs-lock-unlockable-modes t)
(let ((unlock (cdr (assq major-mode emacs-lock-unlockable-modes))))
(or (eq unlock 'all) (eq unlock action))))))
(defun emacs-lock--exit-locked-buffer ()
"Return the name of the first exit-locked buffer found."
(save-current-buffer
(catch :found
(dolist (buffer (buffer-list))
(set-buffer buffer)
(unless (or (emacs-lock--can-auto-unlock 'exit)
(memq emacs-lock-mode '(nil kill)))
(throw :found (buffer-name))))
nil)))
(defun emacs-lock--kill-emacs-hook ()
"Signal an error if any buffer is exit-locked.
Used from `kill-emacs-hook' (which see)."
(let ((buffer-name (emacs-lock--exit-locked-buffer)))
(when buffer-name
(error "Emacs cannot exit because buffer %S is locked" buffer-name))))
(defun emacs-lock--kill-emacs-query-functions ()
"Display a message if any buffer is exit-locked.
Return a value appropriate for `kill-emacs-query-functions' (which see)."
(let ((locked (emacs-lock--exit-locked-buffer)))
(or (not locked)
(progn
(message "Emacs cannot exit because buffer %S is locked" locked)
nil))))
(defun emacs-lock--kill-buffer-query-functions ()
"Display a message if the current buffer is kill-locked.
Return a value appropriate for `kill-buffer-query-functions' (which see)."
(or (emacs-lock--can-auto-unlock 'kill)
(memq emacs-lock-mode '(nil exit))
(progn
(message "Buffer %S is locked and cannot be killed" (buffer-name))
nil)))
(defun emacs-lock--set-mode (mode arg)
"Setter function for `emacs-lock-mode'."
(setq emacs-lock-mode
(cond ((memq arg '(all exit kill))
;; explicit locking mode arg, use it
arg)
((and (eq arg current-prefix-arg) (consp current-prefix-arg))
;; called with C-u M-x emacs-lock-mode, so ask the user
(intern (completing-read "Locking mode: "
'("all" "exit" "kill")
nil t nil nil
(symbol-name
emacs-lock-default-locking-mode))))
((eq mode t)
;; turn on, so use previous setting, or customized default
(or emacs-lock--old-mode emacs-lock-default-locking-mode))
(t
;; anything else (turn off)
mode))))
;;;###autoload
(define-minor-mode emacs-lock-mode
"Toggle Emacs Lock mode in the current buffer.
With \\[universal-argument], ask for the locking mode to be used.
With other prefix ARG, turn mode on if ARG is positive, off otherwise.
Initially, if the user does not pass an explicit locking mode, it defaults
to `emacs-lock-default-locking-mode' (which see); afterwards, the locking
mode most recently set on the buffer is used instead.
When called from Elisp code, ARG can be any locking mode:
exit -- Emacs cannot exit while the buffer is locked
kill -- the buffer cannot be killed, but Emacs can exit as usual
all -- the buffer is locked against both actions
Other values are interpreted as usual."
:init-value nil
:lighter (""
(emacs-lock--try-unlocking " locked:" " Locked:")
(:eval (symbol-name emacs-lock-model)))
:group 'emacs-lock
:variable (emacs-lock-mode .
(lambda (mode)
(emacs-lock--set-mode mode arg)))
(when emacs-lock-mode
(setq emacs-lock--old-mode emacs-lock-mode)
(setq emacs-lock--try-unlocking
(or (and (eq emacs-lock-unlockable-modes t)
(emacs-lock-live-process-p (current-buffer)))
(assq major-mode emacs-lock-unlockable-modes)))))
(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
(unless noninteractive
(add-hook 'kill-buffer-query-functions 'emacs-lock--kill-buffer-query-functions)
;; We set a hook in both kill-emacs-hook and kill-emacs-query-functions because
;; we really want to use k-e-q-f to stop as soon as possible, but don't want to
;; be caught by surprise if someone calls `kill-emacs' instead.
(add-hook 'kill-emacs-hook 'emacs-lock--kill-emacs-hook)
(add-hook 'kill-emacs-query-functions 'emacs-lock--kill-emacs-query-functions))
(defun emacs-lock-unload-function ()
"Unload the Emacs Lock library."
(catch :continue
(dolist (buffer (buffer-list))
(set-buffer buffer)
(when emacs-lock-from-exiting
(error "Emacs is locked from exit due to buffer: %s" (buffer-name))))))
(when emacs-lock-mode
(if (y-or-n-p (format "Buffer %S is locked, unlock it? " (buffer-name)))
(emacs-lock-mode -1)
(message "Unloading of feature `emacs-lock' aborted.")
(throw :continue t))))
;; continue standard unloading
nil))
(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)))
;;; Compatibility
(defun emacs-lock-was-buffer-locked ()
(if emacs-lock-buffer-locked
(setq emacs-lock-from-exiting t)))
(define-obsolete-variable-alias 'emacs-lock-from-exiting 'emacs-lock-mode "24.1")
(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
(defun toggle-emacs-lock ()
"Toggle `emacs-lock-from-exiting' for the current buffer."
(interactive)
(call-interactively 'emacs-lock-mode))
(make-obsolete 'toggle-emacs-lock 'emacs-lock-mode "24.1")
k
;;; 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
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