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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; Play against gnuchess!
;;
;; $Revision$
(require 'chess-engine)
(require 'chess-fen)
(require 'chess-algebraic)
(defgroup chess-gnuchess nil
"The publically available chess engine 'gnuchess'."
:group 'chess-engine)
(defcustom chess-gnuchess-path (executable-find "gnuchess")
"The path to the gnuchess executable."
:type 'file
:group 'chess-gnuchess)
(defvar chess-gnuchess-now-moving nil)
(defvar chess-gnuchess-temp-files nil)
(defvar chess-gnuchess-bad-board nil)
(make-variable-buffer-local 'chess-gnuchess-temp-files)
(make-variable-buffer-local 'chess-gnuchess-bad-board)
(defvar chess-gnuchess-regexp-alist
(list (cons (concat "My move is : \\(" chess-algebraic-regexp "\\)")
(function
(lambda ()
(let* ((move (match-string 1))
(ply (chess-algebraic-to-ply
(chess-engine-position nil) move)))
(unless ply
(error "Could not convert engine move: %s" move))
(let ((chess-gnuchess-now-moving t))
(funcall chess-engine-response-handler 'move ply))))))
(cons "Illegal move:"
(function
(lambda ()
(signal 'chess-illegal "Illegal move"))))
(cons "Board is wrong!"
(function
(lambda ()
;; gnuchess didn't like the given position, which
;; means it won't play against it unless we send a
;; "go" after the user's move
(setq chess-gnuchess-bad-board t))))))
(defun chess-gnuchess-handler (event &rest args)
(cond
((eq event 'initialize)
(let (proc)
(message "Starting chess program 'gnuchess'...")
(unless chess-gnuchess-path
(error "Cannot find gnuchess executable; check `chess-gnuchess-path'"))
(setq proc (start-process "chess-process" (current-buffer)
chess-gnuchess-path))
(message "Starting chess program 'gnuchess'...done")
(process-send-string proc "nopost\n")
proc))
((eq event 'shutdown)
(chess-engine-send nil "quit\n")
(dolist (file chess-gnuchess-temp-files)
(if (file-exists-p file)
(ignore-errors
(delete-file file)))))
((eq event 'setup)
(if (equal (car args) chess-starting-position)
(chess-engine-send nil "new\n")
(let ((file (make-temp-file "gch")))
(with-temp-file file
(insert (chess-pos-to-fen (car args)) ?\n))
(chess-engine-send nil (format "epdload %s\n" file))
(push file chess-gnuchess-temp-files))))
((eq event 'pass)
(chess-engine-send nil (concat (if (chess-pos-side-to-move
(chess-engine-position nil))
"white" "black")
"\n"))
(chess-engine-send nil "go\n")
(setq chess-gnuchess-bad-board nil))
((eq event 'move)
(unless chess-gnuchess-now-moving
(chess-engine-send nil (concat (chess-ply-to-algebraic (car args))
"\n"))
(if chess-gnuchess-bad-board
(chess-engine-send nil "go\n"))))))
(provide 'chess-gnuchess)
;;; chess-gnuchess.el ends here
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