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

   1 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
   2 ;;
   3 ;; Implements a chess clock
   4 ;;
   5
   6 (defvar chess-clock-last-time nil)
   7 (defvar chess-clock-timer nil)
   8
   9 (make-variable-buffer-local 'chess-clock-last-time)
  10 (make-variable-buffer-local 'chess-clock-timer)
  11
  12 (defsubst chess-clock-add-seconds (time seconds)
  13   "To TIME, add SECONDS.  Return result as a time value."
  14   (let* ((secint (truncate seconds))
  15          (hi (/ secint 65536))
  16          (lo (% secint 65536))
  17          (calc (+ (cadr time) lo)))
  18     (if (< calc 65536)
  19         (list (+ (car time) hi) calc)
  20       (list (+ (car time) (1+ hi)) (% calc 65536)))))
  21
  22 (defsubst chess-clock-time-to-seconds (time)
  23   "Convert TIME to a floating point number."
  24   (+ (* (car time) 65536.0)
  25      (cadr time)
  26      (/ (or (car (cdr (cdr time))) 0) 1000000.0)))
  27
  28 (defsubst chess-clock-time-diff (t1 t2)
  29   "Return the difference in seconds between T1 and T2."
  30   (- (chess-clock-time-to-seconds t1)
  31      (chess-clock-time-to-seconds t2)))
  32
  33 (defun chess-clock-handler (game event &rest args)
  34   (cond
  35    ((eq event 'initialize)
  36     (unless (chess-game-data game 'white-remaining)
  37       (chess-game-set-data game 'white-remaining (float (or (car args) 0))))
  38     (unless (chess-game-data game 'black-remaining)
  39       (chess-game-set-data game 'black-remaining (float (or (car args) 0))))
  40     (setq chess-clock-timer
  41           (run-with-timer 0 1 'chess-clock-tick-tock (current-buffer)))
  42     t)
  43
  44    ((eq event 'post-undo)
  45     (let ((last-ply (car (last (chess-game-plies game) 2))))
  46       (chess-game-set-data game 'white-remaining
  47                            (chess-ply-keyword last-ply :white))
  48       (chess-game-set-data game 'black-remaining
  49                            (chess-ply-keyword last-ply :black))))
  50
  51    ((eq event 'move)
  52     (when (> (chess-game-index game) 0)
  53       (let ((last-ply (car (last (chess-game-plies game) 2))))
  54         (nconc last-ply
  55                (list :white (chess-game-data game 'white-remaining)
  56                      :black (chess-game-data game 'black-remaining))))))
  57
  58    ((eq event 'destroy)
  59     (cancel-timer chess-clock-timer))))
  60
  61 (defvar chess-clock-tick-tocking nil)
  62
  63 (defun chess-clock-tick-tock (module)
  64   (unless chess-clock-tick-tocking
  65     (let ((chess-clock-tick-tocking t))
  66       (with-current-buffer module
  67         (let ((last-time chess-clock-last-time) counter)
  68           (setq chess-clock-last-time (current-time))
  69           (when (> (chess-game-index chess-module-game) 0)
  70             (if (chess-pos-side-to-move (chess-game-pos chess-module-game))
  71                 (setq counter 'white-remaining)
  72               (setq counter 'black-remaining))
  73             (chess-game-set-data
  74              chess-module-game counter
  75              (- (chess-game-data chess-module-game counter)
  76                 (chess-clock-time-diff chess-clock-last-time last-time))))))
  77       (force-mode-line-update))))
  78
  79 (provide 'chess-clock)
  80
  81 ;;; chess-clock.el ends here