;;; winner.el --- Restore window configuration or change buffer
;; Copyright (C) 1997 Free Software Foundation. Inc.
;; Author: Ivar Rummelhoff <email@example.com>
;; Maintainer: Ivar Rummelhoff <firstname.lastname@example.org>
;; 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.
;; 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)))
;; 1. You may of course decide to use other bindings than those
;; mentioned above. Just set these variables in your .emacs:
;; 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
;;;; 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.")
"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\".")
(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.")
(defun winner-mode (&optional arg)
"Toggle Winner mode.
With arg, turn Winner mode on if and only if arg is positive."
(let ((on-p (if arg (> (prefix-numeric-value arg) 0)
(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)
(t (remove-hook 'window-configuration-change-hook 'winner-save-configuration)
(setq winner-mode nil)
;; 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))
(defun winner-do-save ()
(let ((current (selected-frame)))
(do ((frames winner-frames-changed (cdr 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)
(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.
(data (list config))
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))
;; 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))
(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)
(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))
(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.
\(For Winner to record changes in window configurations,
Winner mode must be turned on.\)"
((not arg) nil)
((> (prefix-numeric-value arg) 0) winner-next-event)
((< (prefix-numeric-value arg) 0) winner-prev-event)
(if arg (push arg unread-command-events))
(let ((stack (winner-stack (selected-frame)))
(pos 0) event)
;; `stack' and `store' are stacks of window configuration while
;; `buffers' and `passed' are stacks of buffer names.
(setq event (read-event))
((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.
;; Let this change be saved.
(setq pos -1)
;; Perform other actions of this event.
(push event unread-command-events)
(t (push event unread-command-events) (return)))
(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))
(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.
(defun winner-previous ()
"Change to previous window configuration."
(defun winner-next ()
"Change to new window configuration."
;;;; To be evaluated when the package is loaded:
(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)
(push (cons 'winner-mode winner-mode-map)
(unless (assq 'winner-mode minor-mode-alist)
(push '(winner-mode " Win") minor-mode-alist))
;;; winner.el ends here