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

   1 ;;; chess-ucb.el --- Engine interface to the Novag Universal Chess Board
   2
   3 ;; Copyright (C) 2002, 2014 Free Software Foundation, Inc.
   4
   5 ;; Author: John Wiegley <johnw@gnu.org>
   6 ;; Maintainer: Mario Lang <mlang@delysid.org>
   7 ;; Keywords: games
   8
   9 ;; This is free software; you can redistribute it and/or modify it under
  10 ;; the terms of the GNU General Public License as published by the Free
  11 ;; Software Foundation; either version 3, or (at your option) any later
  12 ;; version.
  13 ;;
  14 ;; This is distributed in the hope that it will be useful, but WITHOUT
  15 ;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16 ;; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17 ;; for more details.
  18 ;;
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  21
  22 ;;; Commentary:
  23
  24 ;; jww (2002-04-25): This code has not been tested yet, since I don't
  25 ;; have access to a UCB.  If anybody wants to donate one, or the money
  26 ;; for one ($300), I would be happy to correct this module.  :)
  27
  28 ;;; Code:
  29
  30 (require 'chess-common)
  31
  32 (defgroup chess-ucb nil
  33   "Interface to the Novag Universal Chess Board."
  34   :group 'chess-engine)
  35
  36 (defcustom chess-ucb-device "/dev/ttyS0"
  37   "The serial device used to talk to the Novag UCB."
  38   :type 'file
  39   :group 'chess-ucb)
  40
  41 (defvar chess-ucb-handling-event nil)
  42
  43 (defvar chess-ucb-regexp-alist
  44   (list
  45    (cons "^M\\(..\\)\\(..\\)\\(/\\([QRNB]\\)\\)?\r\n"
  46          (function
  47           (lambda ()
  48             (let ((move (concat (match-string 1)
  49                                 "-"
  50                                 (match-string 2)))
  51                   (promote (match-string 4)))
  52               (if promote
  53                   (setq move (concat move "=" promote)))
  54               (setq move (chess-engine-convert-algebraic move))
  55               ;; I don't use the usual engine logic for this, since
  56               ;; technically the UCB is just an input interface, not a
  57               ;; true engine.
  58               (let ((chess-ucb-handling-event t))
  59                 (chess-game-move (chess-engine-game nil) move))))))))
  60
  61 (defun chess-ucb-handler (game event &rest args)
  62   (unless chess-ucb-handling-event
  63     (cond
  64      ((eq event 'initialize)
  65       (when (file-exists-p chess-ucb-device)
  66         ;; jww (2002-04-25): cat is not bidirectional, so I need
  67         ;; something like "nc" that can talk with characters devices
  68         ;; at 9600 8N1.
  69         (setq chess-engine-process
  70               (start-process "*chess-ucb*" (current-buffer)
  71                              (executable-find "cat") chess-ucb-device))
  72         t))
  73
  74      ((memq event 'orient)
  75       (chess-engine-send nil "N\r\n")
  76       (chess-engine-set-position nil)
  77
  78       ;; jww (2002-04-25): What happens if we're orienting to a
  79       ;; non-standard starting position?  How do we inform the UCB of
  80       ;; the new position?  If it doesn't test move legality, I
  81       ;; suppose we could just move all the pieces around one by
  82       ;; one...
  83       (unless (eq chess-starting-position (chess-engine-position nil))
  84         nil))
  85
  86      ((eq event 'undo)
  87       (dotimes (i (car args))
  88         (chess-engine-send nil "T\r\n"))
  89       ;; prevent us from handling the `undo' event which this triggers
  90       (let ((chess-engine-handling-event t))
  91         (chess-game-undo game (car args))))
  92
  93      ((eq event 'move)
  94       (let ((move (chess-ply-to-algebraic (car args) t)))
  95         (cond
  96          ((chess-ply-keyword (car args) :en-passant)
  97           (setq move (concat move "ep")))
  98          ((chess-ply-keyword (car args) :castle)
  99           (if (chess-pos-side-to-move (chess-ply-pos (car args)))
 100               (setq move "e1-g1")
 101             (setq move "e8-g8")))
 102          ((chess-ply-keyword (car args) :long-castle)
 103           (if (chess-pos-side-to-move (chess-ply-pos (car args)))
 104               (setq move "e1-c1")
 105             (setq move "e8-c8"))))
 106         (chess-engine-send nil (format "M%s\r\n" move)))))))
 107
 108 (provide 'chess-ucb)
 109
 110 ;;; chess-ucb.el ends here