From b3d24ad95aaa81040fc2f4eab468e9aceee37bd3 Mon Sep 17 00:00:00 2001
From: John Wiegley <johnw@newartisans.com>
Date: Sun, 14 Apr 2002 21:18:56 +0000
Subject: *** no comment ***

---
 chess-database.el | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 chess-database.el

(limited to 'chess-database.el')

diff --git a/chess-database.el b/chess-database.el
new file mode 100644
index 0000000..b3aefc0
--- /dev/null
+++ b/chess-database.el
@@ -0,0 +1,78 @@
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;
+;; Basic code for manipulating game databases
+;;
+;; $Revision$
+
+(defvar chess-database-event-handler nil)
+
+(make-variable-buffer-local 'chess-database-event-handler)
+
+(defmacro chess-with-current-buffer (buffer &rest body)
+  `(let ((buf ,buffer))
+     (if buf
+	 (with-current-buffer buf
+	   ,@body)
+       ,@body)))
+
+(chess-message-catalog 'english
+  '((no-such-style . "There is no such chess database module '%s'")))
+
+(defun chess-database-open (module file)
+  "Returns the opened database object, or nil."
+  (let* ((name (symbol-name module))
+	 (handler (intern-soft (concat name "-handler")))
+	 buffer)
+    (unless handler
+      (chess-error 'no-such-database name))
+    (when (setq buffer (funcall handler 'open file))
+      (with-current-buffer buffer
+	(setq chess-database-event-handler handler)
+	(add-hook 'kill-buffer-hook 'chess-database-close nil t)
+	(add-hook 'after-revert-hook 'chess-database-rescan nil t)
+	(current-buffer)))))
+
+(defsubst chess-database-command (database event &rest args)
+  (chess-with-current-buffer database
+    (apply 'chess-database-event-handler nil (current-buffer)
+	   event args)))
+
+(defun chess-database-close (database)
+  (let ((buf (or database (current-buffer))))
+    (when (buffer-live-p buf)
+      (chess-database-command buf 'save)
+      (chess-database-command buf 'close)
+      (with-current-buffer buf
+	(remove-hook 'kill-buffer-hook 'chess-database-quit t))
+      (kill-buffer buf))))
+
+(defun chess-database-save (database)
+  (chess-database-command database 'save))
+
+(defun chess-database-rescan (&optional database)
+  (chess-database-command database 'rescan))
+
+(defun chess-database-count (database)
+  (chess-database-command database 'count))
+
+(defun chess-database-read (database index)
+  (chess-database-command database 'read index))
+
+(defun chess-database-write (database game)
+  (chess-database-command database 'write game))
+
+(defun chess-database-replace (database game &optional index)
+  (chess-database-command database 'replace game index))
+
+(defun chess-database-query (database &rest terms)
+  (chess-database-command database 'query terms))
+
+(defun chess-database-event-handler (game database event &rest args)
+  (if (eq event 'shutdown)
+      (chess-database-close database)
+    (chess-with-current-buffer database
+      (apply chess-database-event-handler event args))))
+
+(provide 'chess-database)
+
+;;; chess-database.el ends here
-- 
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