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+;; jabber-truncate.el - cleanup top lines in chatbuffers
+
+;; Copyright (C) 2007 - Kirill A. Korinskiy - catap@catap.ru
+
+;; This file is a part of jabber.el.
+
+;; 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 2 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, write to the Free Software
+;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+(require 'jabber-chat)
+(require 'jabber-alert)
+
+(require 'cl)
+
+(defvar jabber-log-lines-to-keep 1000
+  "Maximum number of lines in chat buffer")
+
+(defun jabber-truncate-top (buffer &optional ewoc)
+  "Clean old history from a chat BUFFER.
+Optional EWOC is ewoc-widget to work. Default is jabber-chat-ewoc
+`jabber-log-lines-to-keep' specifies the number of lines to
+keep.
+
+Note that this might interfer with
+`jabber-chat-display-more-backlog': you ask for more history, you
+get it, and then it just gets deleted."
+  (interactive)
+    (let* ((inhibit-read-only t)
+           (work-ewoc (if ewoc ewoc jabber-chat-ewoc))
+          (delete-before
+           ;; go back one node, to make this function "idempotent"
+           (ewoc-prev
+            work-ewoc
+            (ewoc-locate work-ewoc
+                         (save-excursion
+                           (set-buffer buffer)
+                           (goto-char (point-max))
+                           (forward-line (- jabber-log-lines-to-keep))
+                           (point))))))
+      (while delete-before
+        (setq delete-before
+              (prog1
+                  (ewoc-prev work-ewoc delete-before)
+                (ewoc-delete work-ewoc delete-before))))))
+
+(defun jabber-truncate-muc (nick group buffer text proposed-alert)
+  "Clean old history from MUC buffers.
+`jabber-log-lines-to-keep' specifies the number of lines to
+keep."
+  (jabber-truncate-top buffer))
+
+(defun jabber-truncate-chat (from buffer text proposed-alert)
+  "Clean old history from chat buffers.
+`jabber-log-lines-to-keep' specifies the number of lines to
+keep.
+
+Note that this might interfer with
+`jabber-chat-display-more-backlog': you ask for more history, you
+get it, and then it just gets deleted."
+  (jabber-truncate-top buffer))
+
+(provide 'jabber-truncate)
+
+;; arch-tag: 3d1e3428-f598-11db-a314-000a95c2fcd0