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|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; Define handler functions that are common to the (relatively)
;; standard chess engine communication protocol:
;;
;; http://www.tim-mann.org/xboard/engine-intf.html
;;
;; $Revision$
(require 'chess-engine)
(defvar chess-common-temp-files nil)
(make-variable-buffer-local 'chess-common-temp-files)
(defmacro chess-with-temp-file (&rest body)
`(let ((file (make-temp-file "chess")))
(with-temp-file file
,@body)
(push file chess-common-temp-files)
file))
(put 'chess-with-temp-file 'lisp-indent-function 1)
(chess-message-catalog 'english
'((starting-engine . "Starting chess program '%s'...")
(starting-engine-done . "Starting chess program '%s'...done")
(could-not-find-engine . "Cannot find %s executable; check `%s'")
(draw-offer-declined . "Your draw offer was declined")
(illegal-move . "Illegal move")))
(defun chess-common-handler (event &rest args)
"Initialize the network chess engine."
(cond
((eq event 'initialize)
(let* ((name (car args))
(path (intern (concat "chess-" name "-path")))
proc)
(chess-message 'starting-engine name)
(unless (boundp path)
(chess-error 'could-not-find-engine name path))
(setq proc (start-process (concat "chess-" name)
(current-buffer) (symbol-value path)))
(chess-message 'starting-engine-done name)
proc))
((eq event 'ready)
(chess-game-set-data chess-engine-game 'active t))
((eq event 'shutdown)
(chess-engine-send nil "quit\n")
(dolist (file chess-common-temp-files)
(if (file-exists-p file)
(delete-file file)))
(setq chess-common-temp-files nil))
((eq event 'pass)
(chess-engine-send nil "go\n"))
((eq event 'resign)
(chess-engine-send nil "resign\n"))
((eq event 'draw)
(chess-message 'draw-offer-declined))
((memq event '(resign abort))
(chess-engine-send nil "new\n")
(chess-engine-set-position nil))
((eq event 'undo)
(dotimes (i (car args))
(chess-engine-send nil "undo\n"))
(if (= 1 (mod (car args) 2))
(chess-engine-send nil "go\n"))
;; prevent use from handling the `undo' event which this triggers
(let ((chess-engine-handling-event t))
(chess-game-undo chess-engine-game (car args))))
((eq event 'move)
(chess-engine-send nil (concat (chess-ply-to-algebraic (car args))
"\n")))))
(provide 'chess-common)
;;; chess-common.el ends here
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