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;;; chess-sjeng.el --- Play against sjeng! -*- lexical-binding: t; -*-
;; Copyright (C) 2004 Free Software Foundation, Inc.
;; Author: 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-sjeng nil
"The publicly available chess engine 'sjeng'."
:group 'chess-engine
:link '(url-link "http://sjeng.sourceforge.net"))
(defcustom chess-sjeng-path (executable-find "sjeng")
"*The path to the sjeng executable."
:type 'file
:group 'chess-sjeng)
(defvar-local chess-sjeng-evaluation nil)
(defvar chess-sjeng-regexp-alist
(list
(cons (concat "move\\s-+\\(" chess-algebraic-regexp "\\)\\s-*$")
(function
(lambda ()
(funcall chess-engine-response-handler 'move
(chess-engine-convert-algebraic (match-string 1) t)))))
(cons "tellics set 1\\s-+\\(.+\\)$"
(function
(lambda ()
(setq chess-engine-opponent-name (match-string 1)))))
(cons "{\\(Black\\|White\\) resigns}"
(function
(lambda ()
(funcall chess-engine-response-handler 'resign))))
(cons "\\(Illegal move\\|unrecognized/illegal command\\):\\s-*\\(.*\\)"
(function
(lambda ()
(error (match-string 1)))))
(cons "command not legal now"
(function
(lambda ()
(error (match-string 0)))))))
(defun chess-sjeng-handler (game event &rest args)
(unless chess-engine-handling-event
(cond
((eq event 'initialize)
(let ((proc (chess-common-handler game 'initialize "sjeng")))
(when (and proc (processp proc)
(eq (process-status proc) 'run))
(process-send-string proc "xboard\nnew\n")
(setq chess-engine-process proc)
t)))
((eq event 'setup-pos)
(chess-engine-send nil (format "setboard %s\n"
(chess-pos-to-fen (car args)))))
((eq event 'move)
(when (= 1 (chess-game-index game))
(chess-game-set-tag game "White" chess-full-name)
(chess-game-set-tag game "Black" chess-engine-opponent-name))
(chess-engine-send
nil
(concat (chess-index-to-coord (chess-ply-source (car args)))
(chess-index-to-coord (chess-ply-target (car args)))
(if (chess-ply-keyword (car args) :promote)
(string (downcase (chess-ply-keyword (car args) :promote)))
"")
"\n"))
(if (chess-game-over-p game)
(chess-game-set-data game 'active nil)))
((eq event 'setup-game)
(let ((file (chess-with-temp-file
(insert (chess-game-to-string (car args)) ?\n))))
(chess-engine-send nil (format "read %s\n" file))))
((eq event 'set-option)
(cond
((eq (car args) 'resign)
(if (cadr args)
(chess-engine-send nil "resign 9\n")
(chess-engine-send nil "resign -1\n")))
((eq (car args) 'ponder)
(if (cadr args)
(chess-engine-send nil "hard\n")
(chess-engine-send nil "easy\n")))))
(t
(if (and (eq event 'undo)
(= 1 (mod (car args) 2)))
(error "Cannot undo until after sjeng moves"))
(apply 'chess-common-handler game event args)))))
(provide 'chess-sjeng)
;;; chess-sjeng.el ends here
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