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 (or (null (car args))
  37                 (chess-game-data game 'white-remaining))
  38       (chess-game-set-data game 'white-remaining (float (car args)))
  39       (chess-game-set-data game 'black-remaining (float (car args))))
  40     t)
  41
  42    ((eq event 'post-undo)
  43     (let* ((last-ply (car (last (chess-game-plies game) 2)))
  44            (white (chess-ply-keyword last-ply :white))
  45            (black (chess-ply-keyword last-ply :black)))
  46       (when (and white black)
  47         (chess-game-set-data game 'white-remaining white)
  48         (chess-game-set-data game 'black-remaining black))))
  49
  50    ((eq event 'move)
  51     (let ((white (chess-game-data game 'white-remaining))
  52           (black (chess-game-data game 'black-remaining)))
  53       (when (and white black
  54                  (chess-game-data game 'active)
  55                  (> (chess-game-index game) 0))
  56         (unless chess-clock-timer
  57           (setq chess-clock-timer
  58                 (run-with-timer 0 1 'chess-clock-tick-tock (current-buffer))))
  59         (let ((last-ply (car (last (chess-game-plies game) 2))))
  60           (chess-ply-set-keyword last-ply :white white)
  61           (chess-ply-set-keyword last-ply :black black)))))
  62
  63    ((eq event 'set-data)
  64     (if (and (eq (car args) 'active)
  65              (not (chess-game-data game 'active)))
  66         (chess-clock-handler game 'destroy)))
  67
  68    ((memq event '(destroy resign drawn))
  69     (when chess-clock-timer
  70       (cancel-timer chess-clock-timer)
  71       (setq chess-clock-timer nil)))))
  72
  73 (defvar chess-clock-tick-tocking nil)
  74
  75 (defun chess-clock-tick-tock (module)
  76   (unless chess-clock-tick-tocking
  77     (let ((chess-clock-tick-tocking t))
  78       (with-current-buffer module
  79         (let ((last-time chess-clock-last-time)
  80               (chess-game-inhibit-events t)
  81               counter)
  82           (setq chess-clock-last-time (current-time))
  83           (when (> (chess-game-index chess-module-game) 0)
  84             (if (chess-pos-side-to-move (chess-game-pos chess-module-game))
  85                 (setq counter 'white-remaining)
  86               (setq counter 'black-remaining))
  87             (chess-game-set-data
  88              chess-module-game counter
  89              (- (chess-game-data chess-module-game counter)
  90                 (chess-clock-time-diff chess-clock-last-time last-time))))))
  91       (force-mode-line-update))))
  92
  93 (provide 'chess-clock)
  94
  95 ;;; chess-clock.el ends here