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+;;; rudel-chat.el --- Handling of chat messages
+;;
+;; Copyright (C) 2008, 2009 Jan Moringen
+;;
+;; Author: Jan Moringen <scymtym@users.sourceforge.net>
+;; Keywords: Rudel, chat, message
+;; X-RCS: $Id:$
+;;
+;; This file is part of Rudel.
+;;
+;; Rudel 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.
+;;
+;; Rudel 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 Rudel. If not, see <http://www.gnu.org/licenses>.
+
+
+;;; Commentary:
+;;
+;; This file contains some functions that deal with incoming chat
+;; messages. Backends that support receiving chat message should
+;; dispatch them using `rudel-chat-dispatch-message'. Chat messages
+;; will be processed in a customizable way from there.
+
+
+;;; History:
+;;
+;; 0.1 - Initial revision.
+
+
+;;; Code:
+;;
+
+
+;;; Customization
+;;
+
+(defcustom rudel-chat-handler-function #'rudel-chat-handle-buffer
+  "A function that is called when chat messages arrive."
+  :group 'rudel
+  :type  '(choice (const :tag "Display messages in the echo area"
+			 rudel-chat-handle-message)
+		  (const :tag "Log messages into a buffer"
+			 rudel-chat-handle-buffer)
+		  (function :tag "Other function"))
+  )
+
+
+;;; Variables and constants
+;;
+
+(defconst rudel-chat-buffer-name "*rudel-chat-log*"
+  "Name of the buffer into which received chat message should be
+inserted.")
+
+
+;;; Interface functions
+;;
+
+(defun rudel-chat-dispatch-message (sender message)
+  "Dispatch SENDER and MESSAGE to customizable handler function."
+  (funcall rudel-chat-handler-function sender message))
+
+
+;;; Handler functions
+;;
+
+(defun rudel-chat-handle-message (sender text)
+  "Display SENDER and MESSAGE in the echo area."
+  (message "%s says: %s"
+	   (rudel-chat-format-sender sender)
+	   text))
+
+(defun rudel-chat-handle-buffer (sender text)
+  "Insert SENDER and MESSAGE in a buffer."
+  (let ((buffer (or (get-buffer rudel-chat-buffer-name)
+		    (pop-to-buffer rudel-chat-buffer-name))))
+    (with-current-buffer buffer
+      (goto-char (point-min))
+      (insert (format "%s: %s\n"
+		      (rudel-chat-format-sender sender)
+		      text))))
+  )
+
+
+;;; Miscellaneous functions
+;;
+
+(defun rudel-chat-format-sender (user)
+  "Format USER handling nil values."
+  (if user
+      (object-name-string user)
+    "<unknown sender>"))
+
+(provide 'rudel-chat)
+;;; rudel-chat.el ends here