--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cubicweb/hooks/bookmark.py	Sat Jan 16 13:48:51 2016 +0100
@@ -0,0 +1,42 @@
+# copyright 2003-2012 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
+# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
+#
+# This file is part of CubicWeb.
+#
+# CubicWeb is free software: you can redistribute it and/or modify it under the
+# terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation, either version 2.1 of the License, or (at your option)
+# any later version.
+#
+# CubicWeb 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 Lesser General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Lesser General Public License along
+# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
+"""bookmark related hooks"""
+
+__docformat__ = "restructuredtext en"
+
+from cubicweb.server import hook
+
+
+class AutoDeleteBookmarkOp(hook.Operation):
+    bookmark = None # make pylint happy
+    def precommit_event(self):
+        if not self.cnx.deleted_in_transaction(self.bookmark.eid):
+            if not self.bookmark.bookmarked_by:
+                self.bookmark.cw_delete()
+
+
+class DelBookmarkedByHook(hook.Hook):
+    """ensure user logins are stripped"""
+    __regid__ = 'autodelbookmark'
+    __select__ = hook.Hook.__select__ & hook.match_rtype('bookmarked_by',)
+    category = 'bookmark'
+    events = ('after_delete_relation',)
+
+    def __call__(self):
+        AutoDeleteBookmarkOp(self._cw,
+                             bookmark=self._cw.entity_from_eid(self.eidfrom))