[PATCH 5 of 6] localrepo: add parentdelta to requires only if enabled in config file

[in3xes at gmail.com]

# HG changeset patch
# User Pradeepkumar Gayam <in3xes at gmail.com>
# Date 1281366535 -19800
# Node ID 897fcb9f3c033f0af3959195c4ff2dd7ed742e38
# Parent  29c71ea032a6b5c27d92436a63994627b3bbec1c
localrepo: add parentdelta to requires only if enabled in config file

diff -r 29c71ea032a6 -r 897fcb9f3c03 mercurial/localrepo.py
--- a/mercurial/localrepo.py	Mon Aug 09 20:38:23 2010 +0530
+++ b/mercurial/localrepo.py	Mon Aug 09 20:38:55 2010 +0530
@@ -21,7 +21,7 @@
 
 class localrepository(repo.repository):
     capabilities = set(('lookup', 'changegroupsubset', 'branchmap', 'pushkey'))
-    supported = set('revlogv1 store fncache shared'.split())
+    supported = set('revlogv1 store fncache shared parentdelta'.split())
 
     def __init__(self, baseui, path=None, create=0):
         repo.repository.__init__(self)
@@ -55,6 +55,8 @@
                         '\0\0\0\2' # represents revlogv2
                         ' dummy changelog to prevent using the old repo layout'
                     )
+                if self.ui.configbool('format', 'parentdelta', False):
+                    requirements.append("parentdelta")
                 reqfile = self.opener("requires", "w")
                 for r in requirements:
                     reqfile.write("%s\n" % r)
@@ -91,6 +93,8 @@
         self.sjoin = self.store.join
         self.opener.createmode = self.store.createmode
         self.sopener.options = {}
+        if 'parentdelta' in requirements:
+            self.sopener.options['parentdelta'] = 1
 
         # These two define the set of tags for this repository.  _tags
         # maps tag name to node; _tagtypes maps tag name to 'global' or