--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hooks/bookmark.py	Fri Aug 14 11:14:10 2009 +0200
@@ -0,0 +1,31 @@
+"""bookmark related hooks
+
+:organization: Logilab
+:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
+:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
+:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
+"""
+__docformat__ = "restructuredtext en"
+
+from cubicweb.selectors import entity_implements
+from cubicweb.server import hook
+
+
+class AutoDeleteBookmarkOp(hook.Operation):
+    bookmark = None # make pylint happy
+    def precommit_event(self):
+        if not self.session.deleted_in_transaction(self.bookmark.eid):
+            if not self.bookmark.bookmarked_by:
+                self.bookmark.delete()
+
+
+class DelBookmarkedByHook(hook.Hook):
+    """ensure user logins are stripped"""
+    __id__ = 'autodelbookmark'
+    __select__ = hook.Hook.__select__ & entity_implements('bookmarked_by',)
+    category = 'bookmark'
+    events = ('after_delete_relation',)
+
+    def __call__(self):
+        AutoDeleteBookmarkOp(self.cw_req,
+                             bookmark=self.cw_req.entity_from_eid(self.eidfrom))