-;;; winner.el --- Restore window configuration or change buffer
-
-;; Copyright (C) 1997 Free Software Foundation. Inc.
-
-;; Author: Ivar Rummelhoff <ivarr@ifi.uio.no>
-;; Maintainer: Ivar Rummelhoff <ivarr@ifi.uio.no>
-;; Created: 27 Feb 1997
-;; Keywords: extensions,windows
-
-;; 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., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
-
-;;; Commentary:
-;;
-;; winner.el provides a minor mode (`winner-mode') that does
-;; essentially two things:
-;;
-;; 1) It keeps track of changing window configurations, so that
-;; when you wish to go back to a previous view, all you have
-;; to do is to press C-left a couple of times.
-;;
-;; 2) It lets you switch to other buffers by pressing C-right.
-;;
-;; To use Winner mode, put this line in your .emacs file:
-;;
-;; (add-hook 'after-init-hook (lambda () (winner-mode 1)))
-\f
-;; Details:
-;;
-;; 1. You may of course decide to use other bindings than those
-;; mentioned above. Just set these variables in your .emacs:
-;;
-;; `winner-prev-event'
-;; `winner-next-event'
-;;
-;; 2. When you have found the view of your choice
-;; (using your favourite keys), you may press ctrl-space
-;; (`winner-max-event') to `delete-other-windows'.
-;;
-;; 3. Winner now keeps one configuration stack for each frame.
-;;
-;;
-;;
-;; Yours sincerely, Ivar Rummelhoff
-;;
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
-;;; Code:
-
-
-
-;;;; Variables you may want to change
-
-(defvar winner-prev-event 'C-left
- "Winner mode binds this event to the command `winner-previous'.")
-
-(defvar winner-next-event 'C-right
- "Winner mode binds this event to the command `winner-next'.")
-
-(defvar winner-max-event 67108896 ; CTRL-space
- "Event for deleting other windows
-after having selected a view with Winner.
-
-The normal functions of this event will also be performed.
-In the default case (CTRL-SPACE) the mark will be set.")
-
-(defvar winner-skip-buffers
- '("*Messages*",
- "*Compile-Log*",
- ".newsrc-dribble",
- "*Completions*",
- "*Buffer list*")
- "Exclude these buffer names
-from any \(Winner mode\) list of buffers.")
-
-(defvar winner-skip-regexps '("^ ")
- "Exclude buffers with names matching any of these regexps.
-..from any \(Winner mode\) list of buffers.
-
-By default `winner-skip-regexps' is set to \(\"^ \"\),
-which excludes \"invisible buffers\".")
-
-\f
-(defvar winner-limit 50
- "Winner will save no more than 2 * `winner-limit' window configurations.
-\(.. and no less than `winner-limit'.\)")
-
-(defvar winner-mode-hook nil
- "Functions to run whenever Winner mode is turned on.")
-
-(defvar winner-mode-leave-hook nil
- "Functions to run whenever Winner mode is turned off.")
-
-(defvar winner-dont-bind-my-keys nil
- "If non-nil: Do not use `winner-mode-map' in Winner mode.")
-
-
-
-;;;; Winner mode
-
-(eval-when-compile (require 'cl))
-
-
-(defvar winner-mode nil) ; For the modeline.
-(defvar winner-mode-map nil "Keymap for Winner mode.")
-
-;;;###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
- (on-p (let ((winner-frames-changed (frame-list)))
- (winner-do-save)) ; Save current configurations
- (add-hook 'window-configuration-change-hook 'winner-save-configuration)
- (setq winner-mode t)
- (run-hooks 'winner-mode-hook))
- (t (remove-hook 'window-configuration-change-hook 'winner-save-configuration)
- (when winner-mode
- (setq winner-mode nil)
- (run-hooks 'winner-mode-leave-hook))))
- (force-mode-line-update)))
-
-
-;; List of frames which have changed
-(defvar winner-frames-changed nil)
-
-;; Time to save the window configuration.
-(defun winner-save-configuration ()
- (push (selected-frame) winner-frames-changed)
- (add-hook 'post-command-hook 'winner-do-save))
-
-\f
-(defun winner-do-save ()
- (let ((current (selected-frame)))
- (unwind-protect
- (do ((frames winner-frames-changed (cdr frames)))
- ((null frames))
- (unless (memq (car frames) (cdr frames))
- ;; Process each frame once.
- (select-frame (car frames))
- (winner-push (current-window-configuration) (car frames))))
- (setq winner-frames-changed nil)
- (select-frame current)
- (remove-hook 'post-command-hook 'winner-do-save))))
-
-
-
-
-
-;;;; Configuration stacks (one for each frame)
-
-
-(defvar winner-stacks nil) ; ------ " ------
-
-
-;; A stack of window configurations with some additional information.
-(defstruct (winner-stack
- (:constructor winner-stack-new
- (config &aux
- (data (list config))
- (place data))))
- data place (count 1))
-
-
-;; Return the stack of this frame
-(defun winner-stack (frame)
- (let ((stack (cdr (assq frame winner-stacks))))
- (if stack (winner-stack-data stack)
- ;; Else make new stack
- (letf (((selected-frame) frame))
- (let ((config (current-window-configuration)))
- (push (cons frame (winner-stack-new config))
- winner-stacks)
- (list config))))))
-
-
-
-\f
-;; Push this window configuration on the right stack,
-;; but make sure the stack doesn't get too large etc...
-(defun winner-push (config frame)
- (let ((this (cdr (assq frame winner-stacks))))
- (if (not this) (push (cons frame (winner-stack-new config))
- winner-stacks)
- (push config (winner-stack-data this))
- (when (> (incf (winner-stack-count this)) winner-limit)
- ;; No more than 2*winner-limit configs
- (setcdr (winner-stack-place this) nil)
- (setf (winner-stack-place this)
- (winner-stack-data this))
- (setf (winner-stack-count this) 1)))))
-
-
-
-
-
-
-
-
-;;;; Selecting a window configuration
-
-
-;; Return list of names of other buffers, excluding the current buffer
-;; and buffers specified by the user.
-(defun winner-other-buffers ()
- (loop for buf in (buffer-list)
- for name = (buffer-name buf)
- unless (or (eq (current-buffer) buf)
- (member name winner-skip-buffers)
- (loop for regexp in winner-skip-regexps
- if (string-match regexp name) return t
- finally return nil))
- collect name))
-
-
-
-(defun winner-select (&optional arg)
-
- "Change to previous or new window configuration.
-With arg start at position 1 if arg is positive, and
-at -1 if arg is negative; else start at position 0.
-\(For Winner to record changes in window configurations,
-Winner mode must be turned on.\)"
- (interactive "P")
-
- (setq arg
- (cond
- ((not arg) nil)
- ((> (prefix-numeric-value arg) 0) winner-next-event)
- ((< (prefix-numeric-value arg) 0) winner-prev-event)
- (t nil)))
- (if arg (push arg unread-command-events))
-\f
- (let ((stack (winner-stack (selected-frame)))
- (store nil)
- (buffers (winner-other-buffers))
- (passed nil)
- (config (current-window-configuration))
- (pos 0) event)
- ;; `stack' and `store' are stacks of window configuration while
- ;; `buffers' and `passed' are stacks of buffer names.
-
- (condition-case nil
-
- (loop
- (setq event (read-event))
- (cond
-
- ((eq event winner-prev-event)
- (cond (passed (push (pop passed) buffers)(decf pos))
- ((cdr stack)(push (pop stack) store) (decf pos))
- (t (setq stack (append (nreverse store) stack))
- (setq store nil)
- (setq pos 0))))
-
- ((eq event winner-next-event)
- (cond (store (push (pop store) stack) (incf pos))
- (buffers (push (pop buffers) passed) (incf pos))
- (t (setq buffers (nreverse passed))
- (setq passed nil)
- (setq pos 0))))
-
- ((eq event winner-max-event)
- ;; Delete other windows and leave.
- (delete-other-windows)
- ;; Let this change be saved.
- (setq pos -1)
- ;; Perform other actions of this event.
- (push event unread-command-events)
- (return))
- (t (push event unread-command-events) (return)))
-
- (cond
- ;; Display
- (passed (set-window-buffer (selected-window) (car passed))
- (message (concat "Winner\(%d\): [%s] "
- (mapconcat 'identity buffers " "))
- pos (car passed)))
-
- (t (set-window-configuration (car stack))
- (if (window-minibuffer-p (selected-window))
- (other-window 1))
- (message "Winner\(%d\)" pos))))
-
- (quit (set-window-configuration config)
- (setq pos 0)))
- (if (zerop pos)
- ;; Do not record these changes.
- (remove-hook 'post-command-hook 'winner-do-save)
- ;; Else update the buffer list and make sure that the displayed
- ;; buffer is the same as the current buffer.
- (switch-to-buffer (window-buffer)))))
-\f
-
-
-
-
-(defun winner-previous ()
- "Change to previous window configuration."
- (interactive)
- (winner-select -1))
-
-(defun winner-next ()
- "Change to new window configuration."
- (interactive)
- (winner-select 1))
-
-
-
-
-;;;; To be evaluated when the package is loaded:
-
-(unless winner-mode-map
- (setq winner-mode-map (make-sparse-keymap))
- (define-key winner-mode-map (vector winner-prev-event) 'winner-previous)
- (define-key winner-mode-map (vector winner-next-event) 'winner-next))
-
-(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))
-
-(unless (assq 'winner-mode minor-mode-alist)
- (push '(winner-mode " Win") minor-mode-alist))
-
-(provide 'winner)
-
-;;; winner.el ends here
+;;; winner.el --- Restore old window configurations
+
+;; Copyright (C) 1997, 1998, 2001, 2002, 2003, 2004,
+;; 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation. Inc.
+
+;; Author: Ivar Rummelhoff <ivarru@math.uio.no>
+;; Created: 27 Feb 1997
+;; 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 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:
+
+;; 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 (boundp 'mark-active)
+ 'mark-active
+ '(region-active-p)))
+
+(defsetf winner-active-region () (store)
+ (if (featurep 'xemacs)
+ `(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)
+
+(defgroup winner nil
+ "Restoring window configurations."
+ :group 'windows)
+
+;;;###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)
+
+
+
+
+\f
+;;;; 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)))
+
+\f
+;; 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)))
+
+
+
+\f
+;;;; 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 if 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)))))))
+
+\f
+;; 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 if 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)))
+
+\f
+;;;###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 (called-interactively-p 'interactive)
+ (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 (called-interactively-p 'interactive)
+ (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)))))))
+
+
+
+\f
+(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
HCoop / bpt / emacs.git / blobdiff