[Grok-dev] Viewlets: Check for availability

[Danilo G B]

Hi, guys.

I was wondering why viewlets in Grok, like viewlets in Plone, don't have a 
method to check their availability at the render time.
This would be as simple as changing the last line in the render method of the 
ViewletManager component (grokcore.viewlet:components.py):

class ViewletManager(ViewletManagerBase):
    ...
    def render(self):
        ....
   -- return u'\n'.join([viewlet.render() for viewlet in self.viewlets])
  ++ return u'\n'.join([viewlet.render() for viewlet in self.viewlets if 
viewlet.available()])

and adding the available method to Viewlet:

class Viewlet(ViewletBase):
    ...

    def available(self):
        return True
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