context: add method to return all bookmarks pointing to a node

mercurial/context.py

@@ -114,6 +114,8 b' class changectx(object):'
         return self._changeset[5]
     def tags(self):
         return self._repo.nodetags(self._node)
+    def bookmarks(self):
+        return self._repo.nodebookmarks(self._node)
 
     def parents(self):
         """return contexts for each parent changeset"""

mercurial/localrepo.py

@@ -399,6 +399,13 b' class localrepository(repo.repository):'
                 tags.sort()
         return self.nodetagscache.get(node, [])
 
+    def nodebookmarks(self, node):
+        marks = []
+        for bookmark, n in self._bookmarks.iteritems():
+            if n == node:
+                marks.append(bookmark)
+        return sorted(marks)
+
     def _branchtags(self, partial, lrev):
         # TODO: rename this function?
         tiprev = len(self) - 1