dispatcher: determine function argument count via inspect

diff --git a/src/mdis/dispatcher.py b/src/mdis/dispatcher.py
index 63b1ebb0888b53be59d4b16829fdc9e5715e48c7..8455039ce298d31637bd6b8c584bc3840c53b5ec 100644 (file)
--- a/src/mdis/dispatcher.py
+++ b/src/mdis/dispatcher.py
@@ -34,9 +34,9 @@ class Hook(object):
     def __call__(self, call):
         class ConcreteHook(Hook):
             def __call__(self, dispatcher, node, *arguments):
-                try:
+                if (len(inspect.signature(call).parameters) > 2):
                     return call(dispatcher, node, *arguments)
-                except TypeError:
+                else:
                     return call(dispatcher, node)
 
         return ConcreteHook(*tuple(self))