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;;; chess-crafty.el --- Play against crafty!
;; Copyright (C) 2002, 2004, 2014 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)
(require 'chess-var)
(defgroup chess-crafty nil
"The publicly available chess engine 'crafty'."
:group 'chess-engine)
(defcustom chess-crafty-path (or (executable-find "crafty")
(executable-find "wcrafty"))
"*The path to the crafty executable."
:type 'file
:group 'chess-crafty)
(defcustom chess-crafty-args "bookpath=$HOME/.crafty logpath=$HOME/.crafty tbpath=$HOME/.crafty"
"Command line arguments to crafty executable"
:type 'string
:group 'chess-crafty)
(defvar chess-crafty-evaluation nil)
(make-variable-buffer-local 'chess-crafty-evaluation)
(defvar chess-crafty-analyzing-p nil
"Non-nil if Crafty is currently in analysis mode.")
(make-variable-buffer-local 'chess-crafty-analyzing-p)
(defvar chess-crafty-regexp-alist
(list
(cons (concat "move\\s-+\\(" chess-algebraic-regexp "\\)\\s-*$")
(function
(lambda ()
(funcall chess-engine-response-handler 'move
(chess-engine-convert-algebraic (match-string 1) t)))))
(cons "total evaluation\\.+\\s-+\\([-+0-9.]+\\)"
(function
(lambda ()
(setq chess-crafty-evaluation
(string-to-number (match-string 1))))))
(cons "tellicsnoalias kibitz Hello from\\s-+\\(.+\\)$"
(function
(lambda ()
(setq chess-engine-opponent-name (match-string 1)))))
(cons "Analyze Mode: type \"exit\" to terminate.$"
(function
(lambda ()
(setq chess-crafty-analyzing-p t))))
(cons (concat "\t ?\\([0-9]+\\)\\s-+"
"\\(-?[0-9]+\\)\\s-+\\([0-9]+\\)\\s-+\\([0-9]+\\)\\s-+"
"\\(" ;; The list of moves
"\\( *[1-9][0-9]*\\. "
"\\(\\.\\.\\.\\|" chess-algebraic-regexp "\\)"
"\\( " chess-algebraic-regexp "\\)?\\)+\\)$")
(function
(lambda ()
(when chess-crafty-analyzing-p
;; We can translate this information to EPD opcodes
(let ((depth (read (match-string 1)))
(centipawn (read (match-string 2)))
(pos (chess-engine-position nil)))
(chess-pos-set-epd pos 'acd depth)
(chess-pos-set-epd pos 'ce centipawn)
(chess-pos-set-epd
pos
'pv ; predicted variation
(save-restriction
(narrow-to-region (match-beginning 5) (match-end 5))
(let ((var (chess-var-create pos)))
(goto-char (point-min))
(while (not (eobp))
(cond
((looking-at "[1-9][0-9]*\\.[ .]*")
(goto-char (match-end 0)))
((looking-at chess-algebraic-regexp)
(goto-char (match-end 0))
(let ((ply (chess-algebraic-to-ply
(chess-var-pos var)
(match-string-no-properties 0))))
(unless ply
(error "unable to read move '%s'"
(match-string-no-properties 0)))
(chess-var-move var ply))))
(skip-chars-forward " "))
var))))))))
(cons "analyze complete.$"
(function
(lambda ()
(setq chess-crafty-analyzing-p nil))))
(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-crafty-handler (game event &rest args)
(unless chess-engine-handling-event
(cond
((eq event 'initialize)
(let ((proc (chess-common-handler game 'initialize "crafty")))
(when (and proc (processp proc)
(eq (process-status proc) 'run))
(process-send-string proc "xboard\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 'evaluate)
(setq chess-crafty-evaluation nil)
(chess-engine-send nil "display general\nscore\ndisplay nogeneral\n")
(let ((limit 50))
(while (and (null chess-crafty-evaluation)
(> (setq limit (1- limit)) 0))
(sit-for 0.1 t))
chess-crafty-evaluation))
((eq event 'analyze)
(if (car args)
(chess-engine-send nil "analyze\npost\n")
(chess-engine-send nil "exit\nnopost\n")))
((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")))
((eq (car args) 'search-depth)
(cl-assert (and (integerp (cadr args)) (>= (cadr args) 0)))
(chess-engine-send nil (format "sd %d\n" (cadr args))))
((eq (car args) 'search-time)
(cl-assert (and (integerp (cadr args)) (> (cadr args) 0)))
(chess-engine-send nil (format "st %d\n" (cadr args))))))
(t
(if (and (eq event 'undo)
(= 1 (mod (car args) 2)))
(error "Cannot undo until after crafty moves"))
(apply 'chess-common-handler game event args)))))
(provide 'chess-crafty)
;;; chess-crafty.el ends here
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