# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@logilab.fr>
# Date 1346674785 -7200
# Node ID e69274f8d4445634a8a1b6227a52bf266c2497ef
# Parent  d686c6876ef6998b2375bcda8b2d53f721248469
clfilter: split `revlog.headrevs` C call from python code

Make the pure python implementation of headrevs available to derived classes. It
is important because filtering logic applied by `revlog` derived class won't
have effect on `index`. We want to be able to bypass this C call to implement
our own.

diff -r d686c6876ef6 -r e69274f8d444 mercurial/revlog.py
--- a/mercurial/revlog.py	Mon Sep 03 14:12:45 2012 +0200
+++ b/mercurial/revlog.py	Mon Sep 03 14:19:45 2012 +0200
@@ -607,7 +607,9 @@
         try:
             return self.index.headrevs()
         except AttributeError:
-            pass
+            return self._headrevs()
+
+    def _headrevs(self):
         count = len(self)
         if not count:
             return [nullrev]