[lib/dialogwizard] on traite les exceptions

Ignore-this: 9a90bd32263c02b9e7f2909b2f69e301

darcs-hash:20090929132138-bd074-50fd73412bff90c7295edd03353a5752eb3b3db7.gz

lib/dialogwizard/wizard.py

@@ -33,8 +33,9 @@ class Step:
 class Scenario:
     u"""This class allows us to define scenarios."""
 
-    def __init__(self):
-        u"""empty scenario"""
+    def __init__(self)
+        u"""empty scenario, with an error handler (that takes an exception as
+        argument)"""
         self.steps = None
 
     def nest(self, step):
@@ -87,6 +88,8 @@ def step_scenario(step):
 def unit_scenario():
     return ( Scenario())
 
+def _relance(exc): raise exc
+
 class Running:
     u"""To run scenarios"""
 
@@ -94,11 +97,12 @@ class Running:
     steps = None
     stack = None
 
-    def __init__(self, scenario, env = {}):
+    def __init__(self, scenario, env = {}, handle = _relance):
         if not isinstance(scenario, Scenario):
             raise TypeError("Can only run Scenarios")
         accu = scenario.steps
         self.env = env
+        self.handle = handle
 
         # To avoid brain spots on the walls, we shall reverse the list
         # of steps.
@@ -157,6 +161,9 @@ class Running:
                     # We can update defaults
                     pass
 
+                except Exception, e:
+                    self.handle(e)
+
         else:
             # Should not be called
             raise "invalid step"