Add localrepo.parents to get parent changectxs.

mercurial/localrepo.py

@@ -321,6 +321,17 b' class localrepository(repo.repository):'
     def changectx(self, changeid=None):
         return context.changectx(self, changeid)
 
+    def parents(self, changeid=None):
+        '''
+        get list of changectxs for parents of changeid or working directory
+        '''
+        if changeid is None:
+            pl = self.dirstate.parents()
+        else:
+            n = self.changelog.lookup(changeid)
+            pl = self.changelog.parents(n)
+        return [self.changectx(n) for n in pl if n != nullid]
+
     def filectx(self, path, changeid=None, fileid=None):
         """changeid can be a changeset revision, node, or tag.
            fileid can be a file revision or node."""