bloodhound-trac / trac / util /

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"""Helper functions for introspection functionality"""

def subclasses(cls):
    """recursively get subclasses of a class"""
    for sub in cls.__subclasses__():
        for subsub in subclasses(sub):
            yield subsub
        yield sub

def get_enabled_component_subclass(env, cls):
    """if the cls is not enabled, attempts to find a subclass which is"""
    if env.is_component_enabled(cls):
        return cls
    for subcls in subclasses(cls):
        if env.is_component_enabled(subcls):
            return subcls
    return None
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