/usr/share/emacs/site-lisp/chess/chess-clock.el is in emacs-chess 2.0b6-1.1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;;
;; Implements a chess clock
;;
(defvar chess-clock-last-time nil)
(defvar chess-clock-timer nil)
(make-variable-buffer-local 'chess-clock-last-time)
(make-variable-buffer-local 'chess-clock-timer)
(defsubst chess-clock-add-seconds (time seconds)
"To TIME, add SECONDS. Return result as a time value."
(let* ((secint (truncate seconds))
(hi (/ secint 65536))
(lo (% secint 65536))
(calc (+ (cadr time) lo)))
(if (< calc 65536)
(list (+ (car time) hi) calc)
(list (+ (car time) (1+ hi)) (% calc 65536)))))
(defsubst chess-clock-time-to-seconds (time)
"Convert TIME to a floating point number."
(+ (* (car time) 65536.0)
(cadr time)
(/ (or (car (cdr (cdr time))) 0) 1000000.0)))
(defsubst chess-clock-time-diff (t1 t2)
"Return the difference in seconds between T1 and T2."
(- (chess-clock-time-to-seconds t1)
(chess-clock-time-to-seconds t2)))
(defun chess-clock-handler (game event &rest args)
(cond
((eq event 'initialize)
(unless (or (null (car args))
(chess-game-data game 'white-remaining))
(chess-game-set-data game 'white-remaining (float (car args)))
(chess-game-set-data game 'black-remaining (float (car args))))
t)
((eq event 'post-undo)
(let* ((last-ply (car (last (chess-game-plies game) 2)))
(white (chess-ply-keyword last-ply :white))
(black (chess-ply-keyword last-ply :black)))
(when (and white black)
(chess-game-set-data game 'white-remaining white)
(chess-game-set-data game 'black-remaining black))))
((eq event 'move)
(let ((white (chess-game-data game 'white-remaining))
(black (chess-game-data game 'black-remaining)))
(when (and white black
(chess-game-data game 'active)
(> (chess-game-index game) 0))
(unless chess-clock-timer
(setq chess-clock-timer
(run-with-timer 0 1 'chess-clock-tick-tock
(current-buffer))))
(let ((last-ply (car (last (chess-game-plies game) 2))))
(chess-ply-set-keyword last-ply :white white)
(chess-ply-set-keyword last-ply :black black))))
(if (chess-game-over-p game)
(chess-clock-handler game 'destroy)))
((eq event 'set-data)
(if (and (eq (car args) 'active)
(not (chess-game-data game 'active)))
(chess-clock-handler game 'destroy)))
((eq event 'destroy)
(if chess-clock-timer
(cancel-timer chess-clock-timer)
(setq chess-clock-timer nil)))))
(defvar chess-clock-tick-tocking nil)
(defun chess-clock-tick-tock (module)
(unless chess-clock-tick-tocking
(let ((chess-clock-tick-tocking t))
(with-current-buffer module
(let ((last-time chess-clock-last-time)
(chess-game-inhibit-events t)
counter)
(setq chess-clock-last-time (current-time))
(when (and (> (chess-game-index chess-module-game) 0)
(not (chess-game-status chess-module-game)))
(if (chess-pos-side-to-move (chess-game-pos chess-module-game))
(setq counter 'white-remaining)
(setq counter 'black-remaining))
(chess-game-set-data
chess-module-game counter
(- (chess-game-data chess-module-game counter)
(chess-clock-time-diff chess-clock-last-time last-time))))))
(force-mode-line-update))))
(provide 'chess-clock)
;;; chess-clock.el ends here
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