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

   1 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
   2 ;;
   3 ;; Implements a chess clock
   4 ;;
   5
   6 (require 'chess-game)
   7 (require 'chess-module)
   8
   9 (defvar chess-clock-last-time nil)
  10 (defvar chess-clock-timer nil)
  11
  12 (make-variable-buffer-local 'chess-clock-last-time)
  13 (make-variable-buffer-local 'chess-clock-timer)
  14
  15 (defsubst chess-clock-add-seconds (time seconds)
  16   "To TIME, add SECONDS.  Return result as a time value."
  17   (let* ((secint (truncate seconds))
  18          (hi (/ secint 65536))
  19          (lo (% secint 65536))
  20          (calc (+ (cadr time) lo)))
  21     (if (< calc 65536)
  22         (list (+ (car time) hi) calc)
  23       (list (+ (car time) (1+ hi)) (% calc 65536)))))
  24
  25 (defsubst chess-clock-time-to-seconds (time)
  26   "Convert TIME to a floating point number."
  27   (+ (* (car time) 65536.0)
  28      (cadr time)
  29      (/ (or (car (cdr (cdr time))) 0) 1000000.0)))
  30
  31 (defsubst chess-clock-time-diff (t1 t2)
  32   "Return the difference in seconds between T1 and T2."
  33   (- (chess-clock-time-to-seconds t1)
  34      (chess-clock-time-to-seconds t2)))
  35
  36 (defun chess-clock-handler (game event &rest args)
  37   (cond
  38    ((eq event 'initialize)
  39     (unless (or (null (car args))
  40                 (chess-game-data game 'white-remaining))
  41       (chess-game-set-data game 'white-remaining (float (car args)))
  42       (chess-game-set-data game 'black-remaining (float (car args))))
  43     t)
  44
  45    ((eq event 'post-undo)
  46     (let* ((last-ply (car (last (chess-game-plies game) 2)))
  47            (white (chess-ply-keyword last-ply :white))
  48            (black (chess-ply-keyword last-ply :black)))
  49       (when (and white black)
  50         (chess-game-set-data game 'white-remaining white)
  51         (chess-game-set-data game 'black-remaining black))))
  52
  53    ((eq event 'move)
  54     (let ((white (chess-game-data game 'white-remaining))
  55           (black (chess-game-data game 'black-remaining)))
  56       (when (and white black
  57                  (chess-game-data game 'active)
  58                  (> (chess-game-index game) 0))
  59         (unless chess-clock-timer
  60           (setq chess-clock-timer
  61                 (run-with-timer 0 1 'chess-clock-tick-tock
  62                                 (current-buffer))))
  63         (let ((last-ply (car (last (chess-game-plies game) 2))))
  64           (chess-ply-set-keyword last-ply :white white)
  65           (chess-ply-set-keyword last-ply :black black))))
  66
  67     (if (chess-game-over-p game)
  68         (chess-clock-handler game 'destroy)))
  69
  70    ((eq event 'set-data)
  71     (if (and (eq (car args) 'active)
  72              (not (chess-game-data game 'active)))
  73         (chess-clock-handler game 'destroy)))
  74
  75    ((eq event 'destroy)
  76     (if chess-clock-timer
  77       (cancel-timer chess-clock-timer)
  78       (setq chess-clock-timer nil)))))
  79
  80 (defvar chess-clock-tick-tocking nil)
  81
  82 (defun chess-clock-tick-tock (module)
  83   (unless chess-clock-tick-tocking
  84     (let ((chess-clock-tick-tocking t))
  85       (with-current-buffer module
  86         (let ((last-time chess-clock-last-time)
  87               (chess-game-inhibit-events t)
  88               counter)
  89           (setq chess-clock-last-time (current-time))
  90           (when (and last-time
  91                      (> (chess-game-index chess-module-game) 0)
  92                      (not (chess-game-status chess-module-game)))
  93             (if (chess-pos-side-to-move (chess-game-pos chess-module-game))
  94                 (setq counter 'white-remaining)
  95               (setq counter 'black-remaining))
  96             (chess-game-set-data
  97              chess-module-game counter
  98              (- (chess-game-data chess-module-game counter)
  99                 (chess-clock-time-diff chess-clock-last-time last-time))))))
 100       (force-mode-line-update))))
 101
 102 (provide 'chess-clock)
 103
 104 ;;; chess-clock.el ends here