(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)))
(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)
(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 ()
(loop for win in (winner-sorted-window-list)
collect (cons (winner-edges win) (window-buffer win))))
(defvar winner-currents nil)
(defsubst winner-conf ()
(cons (current-window-configuration)
(winner-win-data)))
(defun winner-remember ()
(let ((entry (assq (selected-frame) winner-currents)))
(if entry (setcdr entry (winner-conf))
(push (cons (selected-frame) (winner-conf))
winner-currents))))
(defun winner-configuration (&optional frame)
(or (cdr (assq (or frame (selected-frame)) winner-currents))
(letf (((selected-frame) frame))
(winner-conf))))
(defvar winner-ring-alist nil)
(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)))
(defvar winner-last-command nil)
(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)))
(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)))
(ring-remove ring 0))
(ring-insert ring conf)
(push frame winner-last-frames)
frame)))
(defvar winner-modified-list nil)
(defun winner-change-fun ()
(unless (or (memq (selected-frame) winner-modified-list)
(/= 0 (minibuffer-depth)))
(push (selected-frame) winner-modified-list)))
(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)))
(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))
(defun winner-save-conditionally ()
(when (zerop (minibuffer-depth))
(winner-save-unconditionally)))
(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)
(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)
(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)))))))
(defun winner-set (conf)
(let* ((buffers nil)
(alive
(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)
(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)))
(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)))))
(or (null xwins)
(progn
(mapc 'delete-window (cdr xwins)) (unless (one-window-p t)
(delete-window (car xwins))
t))))))
(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.")
(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)))
(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
(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")))
(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"))))))
(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)
(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) (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) (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 () (loop
(cond
((>= winner-undo-counter (ring-length winner-pending-undo-ring))
(message "No further window configuration undo information")
(return nil))
((and (winner-set (ring-ref winner-pending-undo-ring
winner-undo-counter))
(let ((data (winner-win-data)))
(and (not (member data winner-undone-data))
(push data winner-undone-data))))
(return t)) (t (ring-remove winner-pending-undo-ring winner-undo-counter)))))
(defun winner-redo () "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'"))))
(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)