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;;; chess-gnuchess.el --- Play against gnuchess! -*- lexical-binding: t; -*-
;; Copyright (C) 2002, 2004 Free Software Foundation, Inc.
;; Author: John Wiegley <johnw@gnu.org>
;; Maintainer: Mario Lang <mlang@delysid.org>
;; Keywords: games, processes
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Code:
(require 'chess-common)
(require 'chess-fen)
(defgroup chess-gnuchess nil
"The publicly available chess engine 'gnuchess'."
:group 'chess-engine)
(defcustom chess-gnuchess-path (let ((exec-path (cons "/usr/games" exec-path)))
(executable-find "gnuchess"))
"*The path to the gnuchess executable."
:type 'file
:group 'chess-gnuchess)
(defvar-local chess-gnuchess-bad-board nil)
(defvar chess-gnuchess-regexp-alist
(list
(cons (concat "My move is : \\(" chess-algebraic-regexp "\\)")
(function
(lambda ()
(funcall chess-engine-response-handler 'move
(chess-engine-convert-algebraic (match-string 1) t)))))
(cons "Illegal move:"
(function
(lambda ()
(chess-error '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 (game event &rest args)
(unless chess-engine-handling-event
(cond
((eq event 'initialize)
(let ((proc (chess-common-handler game 'initialize "gnuchess")))
(when (and proc (processp proc)
(eq (process-status proc) 'run))
(process-send-string proc "nopost\n")
(setq chess-engine-process proc
chess-engine-opponent-name "GnuChess")
t)))
((eq event 'setup-pos)
(let ((file (chess-with-temp-file
(insert (chess-pos-to-fen (car args)) ?\n))))
(chess-engine-send nil (format "epdload %s\n" file))))
((eq event 'setup-game)
(if (zerop (chess-game-index (car args)))
(chess-gnuchess-handler game 'setup-pos (chess-game-pos game 0))
(let ((file (chess-with-temp-file
(insert (chess-game-to-string (car args)) ?\n))))
(chess-engine-send nil (format "pgnload %s\n" file)))))
((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)
(chess-common-handler game 'move (car args))
(when chess-gnuchess-bad-board
(chess-engine-send nil "go\n")
(setq chess-gnuchess-bad-board nil)))
(t
(apply 'chess-common-handler game event args)))))
(provide 'chess-gnuchess)
;;; chess-gnuchess.el ends here
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