Add some attributes to LoadableConfig for the benefit of montague_pas…

…tedeploy.

src/montague/structs.py

@@ -1,6 +1,7 @@
 from __future__ import absolute_import
 
 from itertools import tee
+import six
 from six.moves import zip as izip
 from characteristic import attributes, Attribute
 
@@ -21,7 +22,12 @@ class Sigil(object):
 
 
 @attributes(['name', 'entry_point_groups', 'loadable_type',
-             'config', 'global_config'], apply_immutable=True)
+             'config', 'global_config',
+             Attribute('inner', default_value=None,
+                       exclude_from_immutable=True, exclude_from_repr=True),
+             Attribute('outer', default_value=None,
+                       exclude_from_immutable=True, exclude_from_repr=True)
+             ], apply_immutable=True)
 class LoadableConfig(object):
     @classmethod
     def app(cls, name, config, global_config):
@@ -47,6 +53,18 @@ def filter(cls, name, config, global_config):
                    loadable_type='filter',
                    entry_point_groups=loadable_type_entry_points['filter'])
 
+    def update(self, name=DEFAULT, config=DEFAULT, global_config=DEFAULT,
+               loadable_type=DEFAULT, entry_point_groups=DEFAULT):
+        update = {}
+        for key, val in six.iteritems(locals()):
+            if key == 'self':
+                continue
+            if val is DEFAULT:
+                update[key] = getattr(self, key)
+            else:
+                update[key] = val
+        return LoadableConfig(**update)
+
 
 @attributes(['filters'], apply_with_init=False)
 class ComposedFilter(object):