mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-05 08:53:45 +00:00
486 lines
16 KiB
EmacsLisp
486 lines
16 KiB
EmacsLisp
;;; winner.el --- Restore old window configurations
|
||
|
||
;; Copyright (C) 1997, 1998, 2001, 2002, 2003, 2004,
|
||
;; 2005 Free Software Foundation. Inc.
|
||
|
||
;; Author: Ivar Rummelhoff <ivarru@math.uio.no>
|
||
;; Created: 27 Feb 1997
|
||
;; Time-stamp: <2002-02-20 22:06:58 ivarru>
|
||
;; Keywords: convenience frames
|
||
|
||
;; 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:
|
||
|
||
;; Winner mode is a global minor mode that records the changes in the
|
||
;; window configuration (i.e. how the frames are partitioned into
|
||
;; windows) so that the changes can be "undone" using the command
|
||
;; `winner-undo'. By default this one is bound to the key sequence
|
||
;; ctrl-c left. If you change your mind (while undoing), you can
|
||
;; press ctrl-c right (calling `winner-redo'). Even though it uses
|
||
;; some features of Emacs20.3, winner.el should also work with
|
||
;; Emacs19.34 and XEmacs20, provided that the installed version of
|
||
;; custom is not obsolete.
|
||
|
||
;; Winner mode was improved August 1998.
|
||
;; Further improvements February 2002.
|
||
|
||
;;; Code:
|
||
|
||
(eval-when-compile
|
||
(require 'cl))
|
||
|
||
|
||
(defmacro winner-active-region ()
|
||
(if (fboundp 'region-active-p)
|
||
'(region-active-p)
|
||
'mark-active))
|
||
|
||
(defsetf winner-active-region () (store)
|
||
(if (fboundp 'zmacs-activate-region)
|
||
`(if ,store (zmacs-activate-region)
|
||
(zmacs-deactivate-region))
|
||
`(setq mark-active ,store)))
|
||
|
||
(defalias 'winner-edges
|
||
(if (featurep 'xemacs) 'window-pixel-edges 'window-edges))
|
||
(defalias 'winner-window-list
|
||
(if (featurep 'xemacs)
|
||
(lambda () (delq (minibuffer-window) (window-list nil 0)))
|
||
(lambda () (window-list nil 0))))
|
||
|
||
(require 'ring)
|
||
|
||
(unless (fboundp 'defgroup)
|
||
(defmacro defgroup (&rest rest)))
|
||
|
||
(defgroup winner nil
|
||
"Restoring window configurations."
|
||
:group 'windows)
|
||
|
||
(unless (fboundp 'defcustom)
|
||
(defmacro defcustom (symbol &optional initvalue docs &rest rest)
|
||
(list 'defvar symbol initvalue docs)))
|
||
|
||
;;;###autoload
|
||
(defcustom winner-mode nil
|
||
"Toggle Winner mode.
|
||
Setting this variable directly does not take effect;
|
||
use either \\[customize] or the function `winner-mode'."
|
||
:set #'(lambda (symbol value) (funcall symbol (or value 0)))
|
||
:initialize 'custom-initialize-default
|
||
:type 'boolean
|
||
:group 'winner
|
||
:require 'winner)
|
||
|
||
(defcustom winner-dont-bind-my-keys nil
|
||
"If non-nil: Do not use `winner-mode-map' in Winner mode."
|
||
:type 'boolean
|
||
:group 'winner)
|
||
|
||
(defcustom winner-ring-size 200
|
||
"Maximum number of stored window configurations per frame."
|
||
:type 'integer
|
||
:group 'winner)
|
||
|
||
(defcustom winner-boring-buffers '("*Completions*")
|
||
"`winner-undo' will not restore windows displaying any of these buffers.
|
||
You may want to include buffer names such as *Help*, *Apropos*,
|
||
*Buffer List*, *info* and *Compile-Log*."
|
||
:type '(repeat string)
|
||
:group 'winner)
|
||
|
||
|
||
|
||
|
||
|
||
;;;; Saving old configurations (internal variables and subroutines)
|
||
|
||
|
||
;;; Current configuration
|
||
|
||
;; List the windows according to their edges.
|
||
(defun winner-sorted-window-list ()
|
||
(sort (winner-window-list)
|
||
(lambda (x y)
|
||
(loop for a in (winner-edges x)
|
||
for b in (winner-edges y)
|
||
while (= a b)
|
||
finally return (< a b)))))
|
||
|
||
(defun winner-win-data ()
|
||
;; Essential properties of the windows in the selected frame.
|
||
(loop for win in (winner-sorted-window-list)
|
||
collect (cons (winner-edges win) (window-buffer win))))
|
||
|
||
;; This variable is updated with the current window configuration
|
||
;; every time it changes.
|
||
(defvar winner-currents nil)
|
||
|
||
;; The current configuration (+ the buffers involved).
|
||
(defsubst winner-conf ()
|
||
(cons (current-window-configuration)
|
||
(winner-win-data)))
|
||
|
||
|
||
;; Save current configuration.
|
||
;; (Called below by `winner-save-old-configurations').
|
||
(defun winner-remember ()
|
||
(let ((entry (assq (selected-frame) winner-currents)))
|
||
(if entry (setcdr entry (winner-conf))
|
||
(push (cons (selected-frame) (winner-conf))
|
||
winner-currents))))
|
||
|
||
;; Consult `winner-currents'.
|
||
(defun winner-configuration (&optional frame)
|
||
(or (cdr (assq (or frame (selected-frame)) winner-currents))
|
||
(letf (((selected-frame) frame))
|
||
(winner-conf))))
|
||
|
||
|
||
|
||
;;; Saved configurations
|
||
|
||
;; This variable contains the window cofiguration rings.
|
||
;; The key in this alist is the frame.
|
||
(defvar winner-ring-alist nil)
|
||
|
||
;; Find the right ring. If it does not exist, create one.
|
||
(defsubst winner-ring (frame)
|
||
(or (cdr (assq frame winner-ring-alist))
|
||
(let ((ring (make-ring winner-ring-size)))
|
||
(ring-insert ring (winner-configuration frame))
|
||
(push (cons frame ring) winner-ring-alist)
|
||
ring)))
|
||
|
||
|
||
;; If the same command is called several times in a row,
|
||
;; we only save one window configuration.
|
||
(defvar winner-last-command nil)
|
||
|
||
;; Frames affected by the previous command.
|
||
(defvar winner-last-frames nil)
|
||
|
||
|
||
(defsubst winner-equal (a b)
|
||
"Check whether two Winner configurations (as produced by
|
||
`winner-conf') are equal."
|
||
(equal (cdr a) (cdr b)))
|
||
|
||
|
||
;; Save the current window configuration, if it has changed.
|
||
;; If so return frame, otherwise return nil.
|
||
(defun winner-insert-if-new (frame)
|
||
(unless (or (memq frame winner-last-frames)
|
||
(eq this-command 'winner-redo))
|
||
(let ((conf (winner-configuration frame))
|
||
(ring (winner-ring frame)))
|
||
(when (and (not (ring-empty-p ring))
|
||
(winner-equal conf (ring-ref ring 0)))
|
||
;; When the previous configuration was very similar,
|
||
;; keep only the latest.
|
||
(ring-remove ring 0))
|
||
(ring-insert ring conf)
|
||
(push frame winner-last-frames)
|
||
frame)))
|
||
|
||
|
||
|
||
;;; Hooks
|
||
|
||
;; Frames affected by the current command.
|
||
(defvar winner-modified-list nil)
|
||
|
||
;; Called whenever the window configuration changes
|
||
;; (a `window-configuration-change-hook').
|
||
(defun winner-change-fun ()
|
||
(unless (or (memq (selected-frame) winner-modified-list)
|
||
(/= 0 (minibuffer-depth)))
|
||
(push (selected-frame) winner-modified-list)))
|
||
|
||
;; A `post-command-hook' for emacsen with
|
||
;; `window-configuration-change-hook'.
|
||
(defun winner-save-old-configurations ()
|
||
(when (zerop (minibuffer-depth))
|
||
(unless (eq this-command winner-last-command)
|
||
(setq winner-last-frames nil)
|
||
(setq winner-last-command this-command))
|
||
(dolist (frame winner-modified-list)
|
||
(winner-insert-if-new frame))
|
||
(setq winner-modified-list nil)
|
||
(winner-remember)))
|
||
|
||
;; A `minibuffer-setup-hook'.
|
||
(defun winner-save-unconditionally ()
|
||
(unless (eq this-command winner-last-command)
|
||
(setq winner-last-frames nil)
|
||
(setq winner-last-command this-command))
|
||
(winner-insert-if-new (selected-frame))
|
||
(winner-remember))
|
||
|
||
;; A `post-command-hook' for other emacsen.
|
||
;; Also called by `winner-undo' before "undoing".
|
||
(defun winner-save-conditionally ()
|
||
(when (zerop (minibuffer-depth))
|
||
(winner-save-unconditionally)))
|
||
|
||
|
||
|
||
|
||
;;;; Restoring configurations
|
||
|
||
;; Works almost as `set-window-configuration',
|
||
;; but does not change the contents or the size of the minibuffer,
|
||
;; and tries to preserve the selected window.
|
||
(defun winner-set-conf (winconf)
|
||
(let* ((miniwin (minibuffer-window))
|
||
(chosen (selected-window))
|
||
(minisize (window-height miniwin)))
|
||
(letf (((window-buffer miniwin))
|
||
((window-point miniwin)))
|
||
(set-window-configuration winconf))
|
||
(cond
|
||
((window-live-p chosen) (select-window chosen))
|
||
((window-minibuffer-p (selected-window))
|
||
(other-window 1)))
|
||
(when (/= minisize (window-height miniwin))
|
||
(letf (((selected-window) miniwin) )
|
||
(setf (window-height) minisize)))))
|
||
|
||
|
||
|
||
(defvar winner-point-alist nil)
|
||
;; `set-window-configuration' restores old points and marks. This is
|
||
;; not what we want, so we make a list of the "real" (i.e. new) points
|
||
;; and marks before undoing window configurations.
|
||
;;
|
||
;; Format of entries: (buffer (mark . mark-active) (window . point) ..)
|
||
|
||
(defun winner-make-point-alist ()
|
||
(letf (((current-buffer)))
|
||
(loop with alist
|
||
for win in (winner-window-list)
|
||
for entry =
|
||
(or (assq (window-buffer win) alist)
|
||
(car (push (list (set-buffer (window-buffer win))
|
||
(cons (mark t) (winner-active-region)))
|
||
alist)))
|
||
do (push (cons win (window-point win))
|
||
(cddr entry))
|
||
finally return alist)))
|
||
|
||
(defun winner-get-point (buf win)
|
||
;; Consult (and possibly extend) `winner-point-alist'.
|
||
;; Returns nil iff buf no longer exists.
|
||
(when (buffer-name buf)
|
||
(let ((entry (assq buf winner-point-alist)))
|
||
(cond
|
||
(entry
|
||
(or (cdr (assq win (cddr entry)))
|
||
(cdr (assq nil (cddr entry)))
|
||
(letf (((current-buffer) buf))
|
||
(push (cons nil (point)) (cddr entry))
|
||
(point))))
|
||
(t (letf (((current-buffer) buf))
|
||
(push (list buf
|
||
(cons (mark t) (winner-active-region))
|
||
(cons nil (point)))
|
||
winner-point-alist)
|
||
(point)))))))
|
||
|
||
|
||
;; Make sure point does not end up in the minibuffer and delete
|
||
;; windows displaying dead or boring buffers
|
||
;; (c.f. `winner-boring-buffers'). Return nil iff all the windows
|
||
;; should be deleted. Preserve correct points and marks.
|
||
(defun winner-set (conf)
|
||
;; For the format of `conf', see `winner-conf'.
|
||
(let* ((buffers nil)
|
||
(alive
|
||
;; Possibly update `winner-point-alist'
|
||
(loop for buf in (mapcar 'cdr (cdr conf))
|
||
for pos = (winner-get-point buf nil)
|
||
if (and pos (not (memq buf buffers)))
|
||
do (push buf buffers)
|
||
collect pos)))
|
||
(winner-set-conf (car conf))
|
||
(let (xwins) ; to be deleted
|
||
|
||
;; Restore points
|
||
(dolist (win (winner-sorted-window-list))
|
||
(unless (and (pop alive)
|
||
(setf (window-point win)
|
||
(winner-get-point (window-buffer win) win))
|
||
(not (member (buffer-name (window-buffer win))
|
||
winner-boring-buffers)))
|
||
(push win xwins))) ; delete this window
|
||
|
||
;; Restore marks
|
||
(letf (((current-buffer)))
|
||
(loop for buf in buffers
|
||
for entry = (cadr (assq buf winner-point-alist))
|
||
do (progn (set-buffer buf)
|
||
(set-mark (car entry))
|
||
(setf (winner-active-region) (cdr entry)))))
|
||
;; Delete windows, whose buffers are dead or boring.
|
||
;; Return t if this is still a possible configuration.
|
||
(or (null xwins)
|
||
(progn
|
||
(mapc 'delete-window (cdr xwins)) ; delete all but one
|
||
(unless (one-window-p t)
|
||
(delete-window (car xwins))
|
||
t))))))
|
||
|
||
|
||
|
||
;;;; Winner mode (a minor mode)
|
||
|
||
(defcustom winner-mode-hook nil
|
||
"Functions to run whenever Winner mode is turned on."
|
||
:type 'hook
|
||
:group 'winner)
|
||
|
||
(defcustom winner-mode-leave-hook nil
|
||
"Functions to run whenever Winner mode is turned off."
|
||
:type 'hook
|
||
:group 'winner)
|
||
|
||
(defvar winner-mode-map
|
||
(let ((map (make-sparse-keymap)))
|
||
(define-key map [(control c) left] 'winner-undo)
|
||
(define-key map [(control c) right] 'winner-redo)
|
||
map)
|
||
"Keymap for Winner mode.")
|
||
|
||
;; Check if `window-configuration-change-hook' is working.
|
||
(defun winner-hook-installed-p ()
|
||
(save-window-excursion
|
||
(let ((winner-var nil)
|
||
(window-configuration-change-hook
|
||
'((lambda () (setq winner-var t)))))
|
||
(split-window)
|
||
winner-var)))
|
||
|
||
|
||
;;;###autoload
|
||
(defun winner-mode (&optional arg)
|
||
"Toggle Winner mode.
|
||
With arg, turn Winner mode on if and only if arg is positive."
|
||
(interactive "P")
|
||
(let ((on-p (if arg (> (prefix-numeric-value arg) 0)
|
||
(not winner-mode))))
|
||
(cond
|
||
;; Turn mode on
|
||
(on-p
|
||
(setq winner-mode t)
|
||
(cond
|
||
((winner-hook-installed-p)
|
||
(add-hook 'window-configuration-change-hook 'winner-change-fun)
|
||
(add-hook 'post-command-hook 'winner-save-old-configurations))
|
||
(t (add-hook 'post-command-hook 'winner-save-conditionally)))
|
||
(add-hook 'minibuffer-setup-hook 'winner-save-unconditionally)
|
||
(setq winner-modified-list (frame-list))
|
||
(winner-save-old-configurations)
|
||
(run-hooks 'winner-mode-hook)
|
||
(when (interactive-p) (message "Winner mode enabled")))
|
||
;; Turn mode off
|
||
(winner-mode
|
||
(setq winner-mode nil)
|
||
(remove-hook 'window-configuration-change-hook 'winner-change-fun)
|
||
(remove-hook 'post-command-hook 'winner-save-old-configurations)
|
||
(remove-hook 'post-command-hook 'winner-save-conditionally)
|
||
(remove-hook 'minibuffer-setup-hook 'winner-save-unconditionally)
|
||
(run-hooks 'winner-mode-leave-hook)
|
||
(when (interactive-p) (message "Winner mode disabled"))))))
|
||
|
||
;; Inspired by undo (simple.el)
|
||
|
||
(defvar winner-undo-frame nil)
|
||
|
||
(defvar winner-pending-undo-ring nil
|
||
"The ring currently used by `winner-undo'.")
|
||
(defvar winner-undo-counter nil)
|
||
(defvar winner-undone-data nil) ; There confs have been passed.
|
||
|
||
(defun winner-undo ()
|
||
"Switch back to an earlier window configuration saved by Winner mode.
|
||
In other words, \"undo\" changes in window configuration."
|
||
(interactive)
|
||
(cond
|
||
((not winner-mode) (error "Winner mode is turned off"))
|
||
(t (unless (and (eq last-command 'winner-undo)
|
||
(eq winner-undo-frame (selected-frame)))
|
||
(winner-save-conditionally) ; current configuration->stack
|
||
(setq winner-undo-frame (selected-frame))
|
||
(setq winner-point-alist (winner-make-point-alist))
|
||
(setq winner-pending-undo-ring (winner-ring (selected-frame)))
|
||
(setq winner-undo-counter 0)
|
||
(setq winner-undone-data (list (winner-win-data))))
|
||
(incf winner-undo-counter) ; starting at 1
|
||
(when (and (winner-undo-this)
|
||
(not (window-minibuffer-p (selected-window))))
|
||
(message "Winner undo (%d / %d)"
|
||
winner-undo-counter
|
||
(1- (ring-length winner-pending-undo-ring)))))))
|
||
|
||
|
||
|
||
|
||
(defun winner-undo-this () ; The heart of winner undo.
|
||
(loop
|
||
(cond
|
||
((>= winner-undo-counter (ring-length winner-pending-undo-ring))
|
||
(message "No further window configuration undo information")
|
||
(return nil))
|
||
|
||
((and ; If possible configuration
|
||
(winner-set (ring-ref winner-pending-undo-ring
|
||
winner-undo-counter))
|
||
; .. and new configuration
|
||
(let ((data (winner-win-data)))
|
||
(and (not (member data winner-undone-data))
|
||
(push data winner-undone-data))))
|
||
(return t)) ; .. then everything is fine.
|
||
(t ;; Otherwise, discharge it (and try the next one).
|
||
(ring-remove winner-pending-undo-ring winner-undo-counter)))))
|
||
|
||
|
||
(defun winner-redo () ; If you change your mind.
|
||
"Restore a more recent window configuration saved by Winner mode."
|
||
(interactive)
|
||
(cond
|
||
((eq last-command 'winner-undo)
|
||
(winner-set
|
||
(if (zerop (minibuffer-depth))
|
||
(ring-remove winner-pending-undo-ring 0)
|
||
(ring-ref winner-pending-undo-ring 0)))
|
||
(unless (eq (selected-window) (minibuffer-window))
|
||
(message "Winner undid undo")))
|
||
(t (error "Previous command was not a `winner-undo'"))))
|
||
|
||
;;; To be evaluated when the package is loaded:
|
||
|
||
(unless (or (assq 'winner-mode minor-mode-map-alist)
|
||
winner-dont-bind-my-keys)
|
||
(push (cons 'winner-mode winner-mode-map)
|
||
minor-mode-map-alist))
|
||
|
||
(provide 'winner)
|
||
;; arch-tag: 686d1c1b-010e-42ca-a192-b5685112418f
|
||
;;; winner.el ends here
|