[MERGE] Support for lazy registation of commands

[Alexander Belchenko]

Lukáš Lalinský пишет:
> Dňa Ne, 2008-08-24 o 11:50 +0300, Alexander Belchenko napísal:
>> +class LazyCommandProxy(object):
>> +
>> +    def __init__(self, module, name, aliases):
>> +        self._module = module
>> +        self._name = name
>> +        self.aliases = aliases
>> +        self.__name__ = name
>> +
>> +    def __call__(self, *args, **kwargs):
>> +        cmd_module = __import__(self._module, globals(), locals(), [True])
>> +        cmd_class = getattr(cmd_module, self._name)
>> +        return cmd_class(*args, **kwargs)
>>
>>
>> Why for you pass [True] as last argument to __import__? IMO, you don't need
>> to pass there anything. According to Python documentation 4th argument
>> lists the names that should be imported from module. So importing name
>> 'True' is useless IIUC.
> 
> Because self._module might be in form 'bzrlib.plugins.foo' and I want the 'foo'
> module, not 'bzrlib':
> 
>   When the name variable is of the form package.module, normally, the
>   top-level package (the name up till the first dot) is returned, not the
>   module named by name. However, when a non-empty fromlist argument is
>   given, the module named by name is returned.

Why in this case you do not use [self._name]?