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, processes
   7
   8 ;; This program 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 3 of the License, or
  11 ;; (at your option) any later version.
  12
  13 ;; This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
  20
  21 ;;; Code:
  22
  23 (require 'chess-uci)
  24
  25 (defgroup chess-stockfish nil
  26   "The publically available chess engine 'stockfish'."
  27   :group 'chess-engine
  28   :link '(url-link "http://www.stockfishchess.com"))
  29
  30 (defcustom chess-stockfish-path (executable-find "stockfish")
  31   "*The path to the stockfish executable."
  32   :type 'file
  33   :group 'chess-stockfish)
  34
  35 (defvar chess-stockfish-regexp-alist
  36   (append
  37    chess-uci-regexp-alist
  38    (list
  39     (cons (concat "^info\\s-+.*nps\\s-+\\([0-9]+\\).*pv\\s-+\\("
  40                   chess-uci-long-algebraic-regexp
  41                   "\\(\\s-+" chess-uci-long-algebraic-regexp "\\)+\\)")
  42           (function
  43            (lambda ()
  44              (setq-local chess-stockfish-nps (string-to-number (match-string 1)))
  45              (setq-local chess-stockfish-pv
  46                          (split-string (match-string 2) " ")))))))
  47   "Patterns used to match stockfish output.")
  48
  49 (defun chess-stockfish-handler (game event &rest args)
  50   (unless chess-engine-handling-event
  51     (cond
  52      ((eq event 'initialize)
  53       (let ((proc (chess-uci-handler game 'initialize "stockfish")))
  54         (when (and proc (processp proc) (eq (process-status proc) 'run))
  55           (process-send-string proc "uci\n")
  56           (setq chess-engine-process proc)
  57           t)))
  58
  59      (t
  60       (if (and (eq event 'undo)
  61                (= 1 (mod (car args) 2)))
  62           (error "Cannot undo until after stockfish moves"))
  63
  64       (apply 'chess-uci-handler game event args)))))
  65
  66 (provide 'chess-stockfish)
  67
  68 ;;; chess-stockfish.el ends here