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|
;;; chess-module.el --- Basic module support code underlying all chess.el modules
;; Copyright (C) 2002, 2004, 2008, 2014 Free Software Foundation, Inc.
;; Author: John Wiegley <johnw@gnu.org>
;; Keywords: games
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Code:
(eval-when-compile (require 'cl-lib))
(require 'chess-game)
(defvar chess-module-game nil)
(defvar chess-module-event-handler nil)
(defvar chess-module-leader nil)
(make-variable-buffer-local 'chess-module-game)
(make-variable-buffer-local 'chess-module-event-handler)
(make-variable-buffer-local 'chess-module-leader)
(chess-message-catalog 'english
'((no-such-module . "There is no module named '%s'")))
(defmacro chess-with-current-buffer (buffer &rest body)
`(let ((buf ,buffer))
(if buf
(with-current-buffer buf
,@body)
,@body)))
(put 'chess-with-current-buffer 'lisp-indent-function 1)
(defun chess-module-create (derived game &optional buffer-name
&rest ctor-args)
(let* ((name (symbol-name derived))
handler)
(unless (and (require derived nil t)
(setq handler (intern-soft (concat name "-handler"))))
(chess-error 'no-such-module name))
(with-current-buffer (generate-new-buffer (or buffer-name
(format " *%s*" name)))
(if (not (apply handler game 'initialize ctor-args))
(ignore
(kill-buffer (current-buffer)))
(add-hook 'kill-buffer-hook 'chess-module-destroy nil t)
(setq chess-module-event-handler handler)
(chess-module-set-game* nil game)
(current-buffer)))))
(defun chess-module-game (module)
(chess-with-current-buffer module
chess-module-game))
(defun chess-module-game-index (module)
(chess-with-current-buffer module
(chess-game-index chess-module-game)))
(defun chess-module-detach-game (module)
(chess-with-current-buffer module
(chess-game-remove-hook chess-module-game
'chess-module-event-handler
(or module (current-buffer)))
;; if we are the leader, shutdown the game we were attached to
;; previously
(if chess-module-leader
(chess-game-run-hooks chess-module-game 'destroy))))
(defun chess-module-set-game (module game &optional no-setup)
(chess-with-current-buffer module
(let ((chess-game-inhibit-events no-setup))
(chess-game-copy-game chess-module-game game))))
(defun chess-module-set-game* (module game)
(chess-with-current-buffer module
(cl-assert game)
(if chess-module-game
(chess-module-detach-game nil))
(setq chess-module-game game)
(chess-game-add-hook game 'chess-module-event-handler
(or module (current-buffer)))))
(defsubst chess-module-leader-p (module)
(chess-with-current-buffer module
chess-module-leader))
(defsubst chess-module-set-leader (module)
(chess-with-current-buffer module
(setq chess-module-leader t)))
(defsubst chess-module-clear-leader (module)
(chess-with-current-buffer module
(setq chess-module-leader nil)))
(defun chess-module-destroy (&optional module)
(let ((buf (or module (current-buffer))))
(when (buffer-live-p buf)
(with-current-buffer buf
(remove-hook 'kill-buffer-hook 'chess-module-destroy t)
(chess-module-detach-game nil))
(kill-buffer buf))))
(defun chess-module-event-handler (game object event &rest args)
(with-current-buffer object
(apply chess-module-event-handler game event args)
(if (eq event 'destroy)
(chess-module-destroy nil))))
(provide 'chess-module)
;;; chess-module.el ends here
|
