Mercurial > hg

changeset 2777:81d7db1aa0fb

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revlog.lookup optimization
author Matt Mackall <mpm@selenic.com>
date Thu, 03 Aug 2006 21:24:19 -0500
parents 557ea210fd9f
children fdc232d8a193
files mercurial/revlog.py
diffstat 1 files changed, 6 insertions(+), 5 deletions(-) [+]
line wrap: on
line diff
--- a/mercurial/revlog.py	Thu Aug 03 20:06:05 2006 -0500
+++ b/mercurial/revlog.py	Thu Aug 03 21:24:19 2006 -0500
@@ -744,8 +744,6 @@
 
     def lookup(self, id):
         """locate a node based on revision number or subset of hex nodeid"""
-        if id in self.nodemap:
-            return id
         if type(id) == type(0):
             return self.node(id)
         try:
@@ -760,10 +758,13 @@
                 if hex(n).startswith(id):
                     c.append(n)
             if len(c) > 1: raise RevlogError(_("Ambiguous identifier"))
-            if len(c) < 1: raise RevlogError(_("No match found"))
-            return c[0]
+            if len(c) == 1: return c[0]
 
-        return None
+        # might need fixing if we change hash lengths
+        if len(id) == 20 and id in self.nodemap:
+            return id
+
+        raise RevlogError(_("No match found"))
 
     def diff(self, a, b):
         """return a delta between two revisions"""