make simplePublishing a function that returns a utility

git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@2525 fd906abe-77d9-0310-91a1-e0d9ade77398

stateful/README.txt

@@ -37,7 +37,7 @@ More complex states definitions
 We'll use a predefined simple publishing workflow that.
 
   >>> from cybertools.stateful.publishing import simplePublishing
-  >>> registerStatesDefinition(simplePublishing)
+  >>> registerStatesDefinition(simplePublishing())
 
   >>> demo = Demo()
   >>> demo.statesDefinition = 'publishing'

stateful/publishing.py

@@ -22,18 +22,17 @@ Definition of a simple publishing workflow.
 $Id$
 """
 
-from zope.interface import implements
+from zope.interface import implementer
 
 from cybertools.stateful.definition import registerStatesDefinition
 from cybertools.stateful.definition import StatesDefinition
 from cybertools.stateful.definition import State, Transition
+from cybertools.stateful.interfaces import IStatesDefinition
 
 
-def simplePublishingFactory():
-    return simplePublishing
-
-
-simplePublishing = StatesDefinition('publishing',
+@implementer(IStatesDefinition)
+def simplePublishing():
+    return StatesDefinition('publishing',
         State('private', 'private', ('show',)),
         State('draft', 'draft', ('publish', 'hide',)),
         State('published', 'published', ('retract',)),