[mousetrap/gnome3-wip: 129/240] Simplify access to class-based configuration.

[Heidi Ellis <heidiellis src gnome org>]

commit 703ba6546e30f8024c61c9278f773499a813b394
Author: Stoney Jackson <dr stoney gmail com>
Date:   Mon Jun 23 15:21:15 2014 -0400

    Simplify access to class-based configuration.

 src/mousetrap/config.py          |   19 +++++++++++++++----
 src/mousetrap/plugins/display.py |    2 +-
 2 files changed, 16 insertions(+), 5 deletions(-)
---
diff --git a/src/mousetrap/config.py b/src/mousetrap/config.py
index 7a23f9a..9d4c026 100644
--- a/src/mousetrap/config.py
+++ b/src/mousetrap/config.py
@@ -46,13 +46,24 @@ class Config(dict):
                 }
             }
 
-        self['plugins'] = {
+        self['classes'] = {
             'mousetrap.plugins.display.DisplayPlugin': {
                 'window_title': 'MouseTrap',
                 }
             }
 
+    def __getitem__(self, key):
+        '''
+        Allow access to class configuration by passing instance of class as
+        the key. For example,
 
-    def for_plugin(self, plugin_object):
-        class_ = plugin_object.__class__
-        return self['plugins'][class_.__module__ + '.' + class_.__name__]
+            x = config[self]['x']
+
+        is equivelant to
+
+            x = config['classes'][self.__class__.__module__+'.'+self.__class__.__name__]['x']
+        '''
+        if isinstance(key, basestring):
+            return super(Config, self).__getitem__(key)
+        class_ = key.__class__
+        return self['classes'][class_.__module__ + '.' + class_.__name__]
diff --git a/src/mousetrap/plugins/display.py b/src/mousetrap/plugins/display.py
index e747a7f..16f90bc 100644
--- a/src/mousetrap/plugins/display.py
+++ b/src/mousetrap/plugins/display.py
@@ -5,7 +5,7 @@ import logging
 class DisplayPlugin(interface.Plugin):
     def __init__(self, config):
         self._config = config
-        self._window_title = config.for_plugin(self)['window_title']
+        self._window_title = config[self]['window_title']
 
     def run(self, app):
         app.gui.show_image(self._window_title, app.image)