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

   1 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
   2 ;;
   3 ;; Engine interface to the Novag Universal Chess Board
   4 ;;
   5 ;; jww (2002-04-25): This code has not been tested yet, since I don't
   6 ;; have access to a UCB.  If anybody wants to donate one, or the money
   7 ;; for one ($300), I would be happy to correct this module.  :)
   8 ;;
   9
  10 (require 'chess-common)
  11
  12 (defgroup chess-ucb nil
  13   "Interface to the Novag Universal Chess Board."
  14   :group 'chess-engine)
  15
  16 (defcustom chess-ucb-device "/dev/ttyS0"
  17   "The serial device used to talk to the Novag UCB."
  18   :type 'file
  19   :group 'chess-ucb)
  20
  21 (defvar chess-ucb-handling-event nil)
  22
  23 (defvar chess-ucb-regexp-alist
  24   (list
  25    (cons "^M\\(..\\)\\(..\\)\\(/\\([QRNB]\\)\\)?\r\n"
  26          (function
  27           (lambda ()
  28             (let ((move (concat (match-string 1)
  29                                 "-"
  30                                 (match-string 2)))
  31                   (promote (match-string 4)))
  32               (if promote
  33                   (setq move (concat move "=" promote)))
  34               (setq move (chess-engine-convert-algebraic move))
  35               ;; I don't use the usual engine logic for this, since
  36               ;; technically the UCB is just an input interface, not a
  37               ;; true engine.
  38               (let ((chess-ucb-handling-event t))
  39                 (chess-game-move (chess-engine-game nil) move))))))))
  40
  41 (defun chess-ucb-handler (game event &rest args)
  42   (unless chess-ucb-handling-event
  43     (cond
  44      ((eq event 'initialize)
  45       (when (file-exists-p chess-ucb-device)
  46         ;; jww (2002-04-25): cat is not bidirectional, so I need
  47         ;; something like "nc" that can talk with characters devices
  48         ;; at 9600 8N1.
  49         (setq chess-engine-process
  50               (start-process "*chess-ucb*" (current-buffer)
  51                              (executable-find "cat") chess-ucb-device))
  52         t))
  53
  54      ((memq event 'orient)
  55       (chess-engine-send nil "N\r\n")
  56       (chess-engine-set-position nil)
  57
  58       ;; jww (2002-04-25): What happens if we're orienting to a
  59       ;; non-standard starting position?  How do we inform the UCB of
  60       ;; the new position?  If it doesn't test move legality, I
  61       ;; suppose we could just move all the pieces around one by
  62       ;; one...
  63       (unless (eq chess-starting-position (chess-engine-position nil))
  64         nil))
  65
  66      ((eq event 'undo)
  67       (dotimes (i (car args))
  68         (chess-engine-send nil "T\r\n"))
  69       ;; prevent us from handling the `undo' event which this triggers
  70       (let ((chess-engine-handling-event t))
  71         (chess-game-undo game (car args))))
  72
  73      ((eq event 'move)
  74       (let ((move (chess-ply-to-algebraic (car args) t)))
  75         (cond
  76          ((chess-ply-keyword (car args) :en-passant)
  77           (setq move (concat move "ep")))
  78          ((chess-ply-keyword (car args) :castle)
  79           (if (chess-pos-side-to-move (chess-ply-pos (car args)))
  80               (setq move "e1-g1")
  81             (setq move "e8-g8")))
  82          ((chess-ply-keyword (car args) :long-castle)
  83           (if (chess-pos-side-to-move (chess-ply-pos (car args)))
  84               (setq move "e1-c1")
  85             (setq move "e8-c8"))))
  86         (chess-engine-send nil (format "M%s\r\n" move)))))))
  87
  88 (provide 'chess-ucb)
  89
  90 ;;; chess-ucb.el ends here