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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; A special kind of display that merely autosaves the game
;;
(require 'chess-game)
(defgroup chess-autosave nil
"A special display that autosaves after each move."
:group 'chess-display)
(defcustom chess-autosave-file "~/.chess-save"
"Filename in which to autosave chess games."
:type '(choice file (const :tag "Do not auto-save" nil))
:group 'chess-autosave)
(chess-message-catalog 'english
'((chess-read-autosave . "There is a chess autosave file, read it? ")
(chess-delete-autosave . "Delete the autosave file? ")))
(defun chess-autosave-handler (game event &rest args)
(cond
((eq event 'initialize)
(if (file-readable-p chess-autosave-file)
(if (y-or-n-p (chess-string 'chess-read-autosave))
(prog1
(chess-game-copy-game
game (chess-autosave-read chess-autosave-file))
(delete-file chess-autosave-file))
(ignore
(if (y-or-n-p (chess-string 'chess-delete-autosave))
(delete-file chess-autosave-file)))))
(kill-buffer (current-buffer))
(set-buffer (find-file-noselect chess-autosave-file t))
t)
((eq event 'post-move)
(chess-autosave-write game chess-autosave-file))
((eq event 'destroy)
(if (file-readable-p chess-autosave-file)
(delete-file chess-autosave-file)))))
(defun chess-autosave-write (game file)
"Write a chess GAME to FILE as raw Lisp."
(let ((game-copy (copy-alist game)))
(chess-game-set-hooks game-copy nil)
(chess-game-set-data-alist game-copy nil)
(with-current-buffer (find-file-noselect file t)
(erase-buffer)
(prin1 game-copy (current-buffer))
(basic-save-buffer)
(message nil))))
(defun chess-autosave-read (file)
"Read a chess game as raw Lisp from FILE."
(with-current-buffer (find-file-noselect file t)
(goto-char (point-min))
(read (current-buffer))))
(provide 'chess-autosave)
;;; chess-autosave.el ends here
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