--- a/hgext/obsolete.py	Tue Aug 07 18:26:13 2012 +0200
+++ b/hgext/obsolete.py	Tue Aug 07 18:46:38 2012 +0200
@@ -460,9 +460,16 @@
 
 
 #####################################################################
-### Additional Utilities functions                                ###
+### Additional Utilities                                          ###
 #####################################################################
 
+@eh.uisetup
+def _installalias(ui):
+    if ui.config('alias', 'pstatus', None) is None:
+        ui.setconfig('alias', 'pstatus', 'status --rev .^')
+    if ui.config('alias', 'pdiff', None) is None:
+        ui.setconfig('alias', 'pdiff', 'diff --rev .^')
+
 def _precursors(repo, s):
     """Precursor of a changeset"""
     cs = set()