# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@octobus.net>
# Date 2017-06-17 10:15:28
# Node ID 28a65fd4b3594200ccb4c4ae27d7fc797fe3f85b
# Parent  6d983e8af49c391d464a0267395bf44267488e5a

configitems: get default values from the central registry when available

We do not have any registered config yet, but we are now ready to use them.

For now we ignore this feature for config access with "alternates". On the long
run, we expect alternates to be handled as "aliases" by the config item
themself.

diff --git a/mercurial/ui.py b/mercurial/ui.py
--- a/mercurial/ui.py
+++ b/mercurial/ui.py
@@ -439,11 +439,17 @@ class ui(object):
         return self._data(untrusted).source(section, name)
 
     def config(self, section, name, default=_unset, untrusted=False):
-        if default is _unset:
-            default = None
         if isinstance(name, list):
             alternates = name
+            # let us ignore the config items in the alternates case for now
+            if default is _unset:
+                default = None
         else:
+            if default is _unset:
+                default = None
+                item = self._knownconfig.get(section, {}).get(name)
+                if item is not None:
+                    default = item.default
             alternates = [name]
 
         for n in alternates: