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448 lines
14 KiB
EmacsLisp
448 lines
14 KiB
EmacsLisp
;;; winner.el --- Restore old window configurations
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;; Copyright (C) 1997, 1998 Free Software Foundation. Inc.
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;; Author: Ivar Rummelhoff <ivarr@ifi.uio.no>
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;; Maintainer: Ivar Rummelhoff <ivarr@ifi.uio.no>
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;; Created: 27 Feb 1997
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;; Time-stamp: <1998-08-21 19:51:02 ivarr>
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;; Keywords: windows
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; Winner mode is a global minor mode that records the changes in the
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;; window configuration (i.e. how the frames are partitioned into
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;; windows) so that the changes can be "undone" using the command
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;; `winner-undo'. By default this one is bound to the key sequence
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;; ctrl-x left. If you change your mind (while undoing), you can
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;; press ctrl-x right (calling `winner-redo'). Even though it uses
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;; some features of Emacs20.3, winner.el should also work with
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;; Emacs19.34 and XEmacs20, provided that the installed version of
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;; custom is not obsolete.
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;; Winner mode was improved august 1998.
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;;; Code:
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(eval-when-compile
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(require 'cl)
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(cond
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((eq (aref (emacs-version) 0) ?X)
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(defmacro winner-active-region ()
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'(region-active-p))
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(defsetf winner-active-region () (store)
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`(if ,store (zmacs-activate-region)
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(zmacs-deactivate-region))))
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(t (defmacro winner-active-region ()
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'mark-active)
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(defsetf winner-active-region () (store)
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`(setq mark-active ,store)))) )
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(require 'ring)
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(when (fboundp 'defgroup)
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(defgroup winner nil
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"Restoring window configurations."
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:group 'windows))
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(unless (fboundp 'defcustom)
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(defmacro defcustom (symbol &optional initvalue docs &rest rest)
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(list 'defvar symbol initvalue docs)))
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;;;###autoload
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(defcustom winner-mode nil
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"Toggle winner-mode.
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Setting this variable directly does not take effect;
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use either \\[customize] or the function `winner-mode'."
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:set #'(lambda (symbol value)
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(winner-mode (or value 0)))
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:initialize 'custom-initialize-default
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:type 'boolean
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:group 'winner
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:require 'winner)
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(defcustom winner-dont-bind-my-keys nil
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"If non-nil: Do not use `winner-mode-map' in Winner mode."
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:type 'boolean
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:group 'winner)
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(defcustom winner-ring-size 200
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"Maximum number of stored window configurations per frame."
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:type 'integer
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:group 'winner)
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;;;; Saving old configurations (internal variables and subroutines)
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;; This variable is updated with the current window configuration
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;; after every command, so that when command make changes in the
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;; window configuration, the last configuration can be saved.
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(defvar winner-currents nil)
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;; The current configuration (+ the buffers involved).
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(defsubst winner-conf ()
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(list (current-window-configuration)
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(loop for w being the windows
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unless (window-minibuffer-p w)
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collect (window-buffer w)) ))
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;; (if winner-testvar (incf winner-testvar) ; For debugging purposes
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;; (setq winner-testvar 0))))
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;; Save current configuration.
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;; (Called by `winner-save-old-configurations' below).
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(defun winner-remember ()
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(let ((entry (assq (selected-frame) winner-currents)))
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(if entry (setcdr entry (winner-conf))
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(push (cons (selected-frame) (winner-conf))
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winner-currents))))
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;; Consult `winner-currents'.
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(defun winner-configuration (&optional frame)
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(or (cdr (assq (or frame (selected-frame)) winner-currents))
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(letf (((selected-frame) frame))
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(winner-conf))))
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;; This variable contains the window cofiguration rings.
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;; The key in this alist is the frame.
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(defvar winner-ring-alist nil)
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;; Find the right ring. If it does not exist, create one.
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(defsubst winner-ring (frame)
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(or (cdr (assq frame winner-ring-alist))
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(progn
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(let ((ring (make-ring winner-ring-size)))
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(ring-insert ring (winner-configuration frame))
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(push (cons frame ring) winner-ring-alist)
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ring))))
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;; If the same command is called several times in a row,
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;; we only save one window configuration.
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(defvar winner-last-command nil)
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;; Frames affected by the previous command.
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(defvar winner-last-frames nil)
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;; Save the current window configuration, if it has changed.
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;; Then return frame, else return nil.
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(defun winner-insert-if-new (frame)
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(unless (or (memq frame winner-last-frames)
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(eq this-command 'winner-redo))
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(let ((conf (winner-configuration frame))
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(ring (winner-ring frame)))
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(when (and (not (ring-empty-p ring))
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(winner-equal conf (ring-ref ring 0)))
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(ring-remove ring 0))
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(ring-insert ring conf)
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(push frame winner-last-frames)
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frame)))
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;; Frames affected by the current command.
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(defvar winner-modified-list nil)
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;; Called whenever the window configuration changes
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;; (a `window-configuration-change-hook').
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(defun winner-change-fun ()
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(unless (memq (selected-frame) winner-modified-list)
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(push (selected-frame) winner-modified-list)))
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;; For Emacs20 (a `post-command-hook').
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(defun winner-save-old-configurations ()
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(unless (eq this-command winner-last-command)
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(setq winner-last-frames nil)
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(setq winner-last-command this-command))
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(dolist (frame winner-modified-list)
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(winner-insert-if-new frame))
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(setq winner-modified-list nil)
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;; (ir-trace ; For debugging purposes
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;; "%S"
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;; (loop with ring = (winner-ring (selected-frame))
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;; for i from 0 to (1- (ring-length ring))
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;; collect (caddr (ring-ref ring i))))
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(winner-remember))
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;; For compatibility with other emacsen
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;; and called by `winner-undo' before "undoing".
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(defun winner-save-unconditionally ()
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(unless (eq this-command winner-last-command)
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(setq winner-last-frames nil)
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(setq winner-last-command this-command))
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(winner-insert-if-new (selected-frame))
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(winner-remember))
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;;;; Restoring configurations
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;; Works almost as `set-window-configuration',
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;; but doesn't change the contents or the size of the minibuffer.
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(defun winner-set-conf (winconf)
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(let ((miniwin (minibuffer-window))
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(minisel (window-minibuffer-p (selected-window))))
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(let ((minibuf (window-buffer miniwin))
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(minipoint (window-point miniwin))
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(minisize (window-height miniwin)))
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(set-window-configuration winconf)
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(setf (window-buffer miniwin) minibuf
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(window-point miniwin) minipoint)
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(when (/= minisize (window-height miniwin))
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(letf (((selected-window) miniwin) )
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;; Clumsy due to cl-macs-limitation
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(setf (window-height) minisize)))
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(cond
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(minisel (select-window miniwin))
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((window-minibuffer-p (selected-window))
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(other-window 1))))))
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(defvar winner-point-alist nil)
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;; `set-window-configuration' restores old points and marks. This is
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;; not what we want, so we make a list of the "real" (i.e. new) points
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;; and marks before undoing window configurations.
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;;
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;; Format of entries: (buffer (mark . mark-active) (window . point) ..)
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(defun winner-make-point-alist ()
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(letf (((current-buffer)))
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(loop with alist
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with entry
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for win being the windows
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do (cond
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((window-minibuffer-p win))
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((setq entry (assq win alist))
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;; Update existing entry
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(push (cons win (window-point win))
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(cddr entry)))
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(t;; Else create new entry
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(push (list (set-buffer (window-buffer win))
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(cons (mark t) (winner-active-region))
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(cons win (window-point win)))
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alist)))
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finally return alist)))
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(defun winner-get-point (buf win)
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;; Consult (and possibly extend) `winner-point-alist'.
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(when (buffer-name buf)
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(let ((entry (assq buf winner-point-alist)))
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(cond
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(entry
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(or (cdr (assq win (cddr entry)))
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(cdr (assq nil (cddr entry)))
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(letf (((current-buffer) buf))
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(push (cons nil (point)) (cddr entry))
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(point))))
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(t (letf (((current-buffer) buf))
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(push (list buf
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(cons (mark t) (winner-active-region))
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(cons nil (point)))
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winner-point-alist)
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(point)))))))
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;; Make sure point doesn't end up in the minibuffer and
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;; delete windows displaying dead buffers. Return nil
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;; if and only if all the windows should have been deleted.
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;; Do not move neither points nor marks.
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(defun winner-set (conf)
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(let* ((buffers nil)
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(origpoints
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(loop for buf in (cadr conf)
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for pos = (winner-get-point buf nil)
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if (and pos (not (memq buf buffers)))
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do (push buf buffers)
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collect pos)))
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(winner-set-conf (car conf))
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(let (xwins) ; These windows should be deleted
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(loop for win being the windows
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unless (window-minibuffer-p win)
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do (if (pop origpoints)
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(setf (window-point win)
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;; Restore point
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(winner-get-point
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(window-buffer win)
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win))
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(push win xwins))) ; delete this window
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;; Restore mark
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(letf (((current-buffer)))
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(loop for buf in buffers
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for entry = (cadr (assq buf winner-point-alist))
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do (progn (set-buffer buf)
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(set-mark (car entry))
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(setf (winner-active-region) (cdr entry)))))
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;; Delete windows, whose buffers are dead.
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;; Return t if this is still a possible configuration.
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(or (null xwins)
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(progn (mapcar 'delete-window (cdr xwins))
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(if (one-window-p t)
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nil ; No windows left
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(progn (delete-window (car xwins))
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t)))))))
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;;;; Winner mode (a minor mode)
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(defcustom winner-mode-hook nil
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"Functions to run whenever Winner mode is turned on."
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:type 'hook
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:group 'winner)
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(defcustom winner-mode-leave-hook nil
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"Functions to run whenever Winner mode is turned off."
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:type 'hook
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:group 'winner)
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(defvar winner-mode-map nil "Keymap for Winner mode.")
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;; Is `window-configuration-change-hook' working?
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(defun winner-hook-installed-p ()
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(save-window-excursion
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(let ((winner-var nil)
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(window-configuration-change-hook
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'((lambda () (setq winner-var t)))))
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(split-window)
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winner-var)))
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;;;###autoload
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(defun winner-mode (&optional arg)
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"Toggle Winner mode.
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With arg, turn Winner mode on if and only if arg is positive."
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(interactive "P")
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(let ((on-p (if arg (> (prefix-numeric-value arg) 0)
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(not winner-mode))))
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(cond
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;; Turn mode on
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(on-p
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(setq winner-mode t)
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(cond
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((winner-hook-installed-p)
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(add-hook 'window-configuration-change-hook 'winner-change-fun)
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(add-hook 'post-command-hook 'winner-save-old-configurations))
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(t (add-hook 'post-command-hook 'winner-save-unconditionally)))
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(setq winner-modified-list (frame-list))
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(winner-save-old-configurations)
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(run-hooks 'winner-mode-hook))
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;; Turn mode off
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(winner-mode
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(setq winner-mode nil)
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(remove-hook 'window-configuration-change-hook 'winner-change-fun)
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(remove-hook 'post-command-hook 'winner-save-old-configurations)
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(remove-hook 'post-command-hook 'winner-save-unconditionally)
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(run-hooks 'winner-mode-leave-hook)))
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(force-mode-line-update)))
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;; Inspired by undo (simple.el)
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(defvar winner-undo-frame nil)
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(defvar winner-pending-undo-ring nil
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"The ring currently used by winner undo.")
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(defvar winner-undo-counter nil)
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(defvar winner-undone-data nil) ; There confs have been passed.
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(defun winner-undo ()
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"Switch back to an earlier window configuration saved by Winner mode.
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In other words, \"undo\" changes in window configuration."
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(interactive)
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(cond
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((not winner-mode) (error "Winner mode is turned off"))
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(t (unless (and (eq last-command 'winner-undo)
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(eq winner-undo-frame (selected-frame)))
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(winner-save-unconditionally) ; current configuration->stack
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(setq winner-undo-frame (selected-frame))
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(setq winner-point-alist (winner-make-point-alist))
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(setq winner-pending-undo-ring (winner-ring (selected-frame)))
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(setq winner-undo-counter 0)
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(setq winner-undone-data (list (winner-win-data))))
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(incf winner-undo-counter) ; starting at 1
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(when (and (winner-undo-this)
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(not (window-minibuffer-p (selected-window))))
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(message "Winner undo (%d / %d)"
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winner-undo-counter
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(1- (ring-length winner-pending-undo-ring)))))))
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(defun winner-win-data ()
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;; Essential properties of the windows in the selected frame.
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(loop for win being the windows
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unless (window-minibuffer-p win)
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collect (list (window-buffer win)
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(window-width win)
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(window-height win))))
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(defun winner-undo-this () ; The heart of winner undo.
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(loop
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(cond
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((>= winner-undo-counter (ring-length winner-pending-undo-ring))
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(message "No further window configuration undo information")
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(return nil))
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((and ; If possible configuration
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(winner-set (ring-ref winner-pending-undo-ring
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winner-undo-counter))
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;; .. and new configuration
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(let ((data (winner-win-data)))
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(and (not (member data winner-undone-data))
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(push data winner-undone-data))))
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(return t)) ; .. then everything is all right.
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(t ; Else; discharge it and try another one.
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(ring-remove winner-pending-undo-ring winner-undo-counter)))))
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(defun winner-redo () ; If you change your mind.
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"Restore a more recent window configuration saved by Winner mode."
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(interactive)
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(cond
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((eq last-command 'winner-undo)
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(winner-set
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(ring-remove winner-pending-undo-ring 0))
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(unless (eq (selected-window) (minibuffer-window))
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(message "Winner undid undo")))
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(t (error "Previous command was not a winner-undo"))))
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;;; To be evaluated when the package is loaded:
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(if (fboundp 'compare-window-configurations)
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(defalias 'winner-equal 'compare-window-configurations)
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(defalias 'winner-equal 'equal))
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(unless winner-mode-map
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(setq winner-mode-map (make-sparse-keymap))
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(define-key winner-mode-map [(control x) left] 'winner-undo)
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(define-key winner-mode-map [(control x) right] 'winner-redo))
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(unless (or (assq 'winner-mode minor-mode-map-alist)
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winner-dont-bind-my-keys)
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(push (cons 'winner-mode winner-mode-map)
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minor-mode-map-alist))
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(unless (assq 'winner-mode minor-mode-alist)
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(push '(winner-mode " Win") minor-mode-alist))
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(provide 'winner)
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;;; winner.el ends here
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