# HG changeset patch
# User Franz Glasner <f.glasner@feldmann-mg.com>
# Date 1457604677 -3600
# Node ID 04505a8dbfc071a1b28ac840772cf04cff4ba31f
# Parent  a04fa81e10ae8659442bf6f9839bd2a021eb0476
Use ordered dictionaries (if available) when reading Python configuration files

diff -r a04fa81e10ae -r 04505a8dbfc0 configmix/py.py
--- a/configmix/py.py	Thu Mar 10 10:45:09 2016 +0100
+++ b/configmix/py.py	Thu Mar 10 11:11:17 2016 +0100
@@ -6,6 +6,13 @@
 from __future__ import division, absolute_import, print_function
 
 import locale
+try:
+    from collections import OrderedDict as DictImpl
+except ImportError:
+    try:
+        from ordereddict import OrderedDict as DictImpl
+    except ImportError:
+        DictImpl = dict
 
 from .compat import PY2
 
@@ -17,8 +24,8 @@
     if extract is not None:
         if not isinstance(extract, (type([]), type(tuple()), type(set()), )):
             raise TypeError("`extract' must be a sequence")
-    gcontext = dict()
-    lcontext = dict()
+    gcontext = DictImpl()
+    lcontext = DictImpl()
     if PY2:
         filename2 = filename.encode(locale.getpreferredencoding())
     if PY2:
@@ -33,6 +40,9 @@
             extract = lcontext["__all__"]
         else:
             extract = [k for k in lcontext if not k.startswith('_')]
-    # don't bail on non-existing keys
+    #
+    # Don't bail on non-existing keys and (implicitly) convert to an
+    # ordered list
+    #
     extract = [v for v in extract if v in lcontext]
-    return dict(zip(extract, [lcontext[v] for v in extract]))
+    return DictImpl(zip(extract, [lcontext[v] for v in extract]))