code.delx.au - gnu-emacs-elpa/blob - chess-stockfish.el

   1 ;;; chess-stockfish.el --- Play against stockfish!
   2
   3 ;; Copyright (C) 2014  Free Software Foundation, Inc.
   4
   5 ;; Author: Mario Lang <mlang@delysid.org>
   6 ;; Keywords: games
   7
   8 ;; This file is free software; you can redistribute it and/or modify
   9 ;; it under the terms of the GNU General Public License as published by
  10 ;; the Free Software Foundation; either version 2, or (at your option)
  11 ;; any later version.
  12
  13 ;; This file is distributed in the hope that it will be useful,
  14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 ;; GNU General Public License for more details.
  17
  18 ;; You should have received a copy of the GNU General Public License
  19 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  20 ;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  21 ;; Boston, MA 02111-1307, USA.
  22
  23 ;;; Code:
  24
  25 (require 'chess-uci)
  26
  27 (defgroup chess-stockfish nil
  28   "The publically available chess engine 'stockfish'."
  29   :group 'chess-engine
  30   :link '(url-link "http://www.stockfishchess.com"))
  31
  32 (defcustom chess-stockfish-path (executable-find "stockfish")
  33   "*The path to the stockfish executable."
  34   :type 'file
  35   :group 'chess-stockfish)
  36
  37 (defvar chess-stockfish-regexp-alist
  38   (append
  39    chess-uci-regexp-alist
  40    (list
  41     (cons (concat "^info\\s-+.*nps\\s-+\\([0-9]+\\).*pv\\s-+\\("
  42                   chess-uci-long-algebraic-regexp
  43                   "\\(\\s-+" chess-uci-long-algebraic-regexp "\\)+\\)")
  44           (function
  45            (lambda ()
  46              (setq-local chess-stockfish-nps (string-to-number (match-string 1)))
  47              (setq-local chess-stockfish-pv
  48                          (split-string (match-string 2) " ")))))))
  49   "Patterns used to match stockfish output.")
  50
  51 (defun chess-stockfish-handler (game event &rest args)
  52   (unless chess-engine-handling-event
  53     (cond
  54      ((eq event 'initialize)
  55       (let ((proc (chess-uci-handler game 'initialize "stockfish")))
  56         (when (and proc (processp proc) (eq (process-status proc) 'run))
  57           (process-send-string proc "uci\n")
  58           (setq chess-engine-process proc)
  59           t)))
  60
  61      (t
  62       (if (and (eq event 'undo)
  63                (= 1 (mod (car args) 2)))
  64           (error "Cannot undo until after stockfish moves"))
  65
  66       (apply 'chess-uci-handler game event args)))))
  67
  68 (provide 'chess-stockfish)
  69
  70 ;;; chess-stockfish.el ends here