/usr/share/emacs/site-lisp/chess/chess-common.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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;;
;; Define handler functions that are common to the (relatively)
;; standard chess engine communication protocol:
;;
;; http://www.tim-mann.org/xboard/engine-intf.html
;;
(require 'chess-engine)
(require 'chess-message)
(defvar chess-common-engine-name nil)
(defvar chess-common-temp-files nil)
(make-variable-buffer-local 'chess-common-engine-name)
(make-variable-buffer-local 'chess-common-temp-files)
(defmacro chess-with-temp-file (&rest body)
`(let ((file (make-temp-file "chess")))
(with-temp-file file
,@body)
(push file chess-common-temp-files)
file))
(put 'chess-with-temp-file 'lisp-indent-function 1)
(chess-message-catalog 'english
'((starting-engine . "Starting chess program '%s'...")
(starting-engine-done . "Starting chess program '%s'...done")
(could-not-find-engine . "Cannot find %s executable; check `%s'")
(draw-offer-declined . "Your draw offer was declined")
(illegal-move . "Illegal move")
(not-yet-implemented . "This feature is not yet implemented")))
(defun chess-common-handler (game event &rest args)
"Initialize the network chess engine."
(cond
((eq event 'initialize)
(let* ((name (car args))
(path (intern (concat "chess-" name "-path")))
proc)
(chess-message 'starting-engine name)
(unless (boundp path)
(chess-error 'could-not-find-engine name path))
(setq proc (start-process (concat "chess-" name)
(current-buffer) (symbol-value path)))
(chess-message 'starting-engine-done name)
proc))
((eq event 'ready)
(chess-game-set-data game 'active t)
(chess-game-run-hooks game 'check-autosave))
((eq event 'destroy)
(let ((proc (get-buffer-process (current-buffer))))
(if (and (processp proc)
(memq (process-status proc) '(run open)))
(chess-engine-send nil "quit\n")))
(dolist (file chess-common-temp-files)
(if (file-exists-p file)
(delete-file file)))
(setq chess-common-temp-files nil))
((eq event 'pass)
(chess-engine-send nil "go\n"))
((eq event 'draw)
(chess-message 'draw-offer-declined))
((eq event 'resign)
(chess-engine-send nil "resign\n")
(chess-game-set-data game 'active nil))
((eq event 'new)
(chess-engine-send nil "new\n")
(chess-engine-set-position nil))
((eq event 'force)
(chess-error 'not-yet-implemented))
((eq event 'undo)
(dotimes (i (car args))
(chess-engine-send nil "undo\n"))
(if (= 1 (mod (car args) 2))
(chess-engine-send nil "go\n"))
;; prevent us from handling the `undo' event which this triggers
(let ((chess-engine-handling-event t))
(chess-game-undo game (car args))))
((eq event 'flag-fell)
(chess-game-set-data game 'active nil)
(let ((chess-game-inhibit-events t))
(chess-game-end game :flag-fell)))
((eq event 'move)
(when (= 1 (chess-game-index game))
(chess-game-set-tag game "White" chess-full-name)
(chess-game-set-tag game "Black" chess-engine-opponent-name))
(chess-engine-send nil (concat (chess-ply-to-algebraic (car args))
"\n"))
(if (chess-game-over-p game)
(chess-game-set-data game 'active nil)))))
(provide 'chess-common)
;;; chess-common.el ends here
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