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We can handle notification and transform via the "callable hooks" system, but we don't have a "handler" that is the last one to get it and then things stop.

One way to handle this: have a series of method calling handlers that do things in different ways, like:

• callable_hook_runone: runs them all till they stop
  • which order? Does the last or the first get to claim it?
• callable_hook_runall: runs every one of the hooks
  • likewise... which order?

.. both of those would expect *args, **kwargs and pass those keyword arguments onto the hooks.

It might also be possible to make some callable classes like this, like:

   callable_hook = CallableHookRunone(
      'some_hookname', accrue=True)  # accrues the results into a list
   results = callable_hook(arg1, arg2, kwarg="foo")

I wonder if it's possible to do something like this:

  class BlaBlaForm(pluginapi.HookForm):
    _hook_name = 'blabla'
    bla_bla = wtforms.BlaBlaField()

This would require some fancy metaclassing but if it worked, it should be able to allow to attach fields to the form either before or after like the following:

  pluginapi.add_form_field(
     wtforms.SomeFormField(),
     position=before)

Is this possible? Not totally sure. Would be great if it did. Would also involve evil metaclassing. But what part of plugin systems don't involve a bit of evil ;)