changeset 2489:568e58eed096

Add revlog.parentrevs function.

This allows one to walk the revision graph using only revision numbers,
which can be faster than using revision hashes, especially for
RevlogNG, where the parents of a revision are stored as revision
numbers.

--- a/mercurial/revlog.py	Fri Jun 23 12:52:42 2006 -0700
+++ b/mercurial/revlog.py	Tue Jun 20 14:57:30 2006 -0300
@@ -477,6 +477,13 @@
         if self.version == REVLOGV0:
             return d
         return [ self.node(x) for x in d ]
+    def parentrevs(self, rev):
+        if rev == -1:
+            return (-1, -1)
+        d = self.index[rev][-3:-1]
+        if self.version == REVLOGV0:
+            return [ self.rev(x) for x in d ]
+        return d
     def start(self, rev):
         if rev < 0:
             return -1