# HG changeset patch
# User Matt Mackall <mpm@selenic.com>
# Date 2008-06-26 18:46:31
# Node ID 5918e2b79859ac53d4bd00486c0169627d70376c
# Parent  b148e909913396bceeaed694f073482291c9a28f

context: simplify changeid logic

diff --git a/mercurial/context.py b/mercurial/context.py
--- a/mercurial/context.py
+++ b/mercurial/context.py
@@ -12,16 +12,11 @@ import ancestor, bdiff, revlog, util, os
 class changectx(object):
     """A changecontext object makes access to data related to a particular
     changeset convenient."""
-    def __init__(self, repo, changeid=None):
+    def __init__(self, repo, changeid=''):
         """changeid is a revision number, node, or tag"""
+        if changeid == '':
+            changeid = '.'
         self._repo = repo
-
-        if not changeid and changeid != 0:
-            p1, p2 = self._repo.dirstate.parents()
-            self._rev = self._repo.changelog.rev(p1)
-            self._node = p1
-            return
-
         self._node = self._repo.lookup(changeid)
         self._rev = self._repo.changelog.rev(self._node)