[core] Add support for module parameters

Parse '-p' parameters and make them accessible via 'parameter()' from
within a module (basically, restore the previous configuration
facility).

Still TODO: Add support for configuration files.

core/module.py

@@ -15,11 +15,23 @@ class Module(object):
     def __init__(self, config=None, widgets=[]):
         self._config = config
         self._widgets = widgets if isinstance(widgets, list) else [ widgets ]
+        self._name = None
+
+    def parameter(self, key, default=None):
+        value = default
+
+        for prefix in [ self.name(), self.module_name() ]:
+            value = self._config.get('{}.{}'.format(prefix, key), value)
+        # TODO retrieve from config file
+        return value
 
     def update(self):
         pass
 
     def name(self):
+        return self._name if self._name else self.module_name()
+
+    def module_name(self):
         return self.__module__.split('.')[-1]
 
     def widgets(self):

core/widget.py

@@ -9,7 +9,7 @@ class Widget(util.store.Store):
             self._full_text = value
         else:
             if callable(self._full_text):
-                return self._full_text(self)
+                return self._full_text()
             return self._full_text
 
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