[rfc] UIFactory.is_interactive()

Martin Pool mbp at canonical.com
Tue Nov 24 22:48:46 GMT 2009

2009/11/25 Gordon Tyler <gordon at doxxx.net>:
> Andrew Bennetts wrote:
>>> This somewhat violates "don't look before you leap" but it's probably
>>> worthwhile to avoid thinking about interactive stuff before you do it.
>> Maybe a less LBYL solution would be:
>>    if not ui_factory.get_boolean("really delete everything?",
>> default=True):
>>        return
>>    delete_everything()
>> Although perhaps “default choice” is not precisely the same concept as
>> “choice
>> to take when non-interactive”, it's probably close enough.

Another option is to make them all raise some exception indicating
that no user interaction is possible.

get_boolean was perhaps not a good example to use because it's likely
in all those cases that you can just assume 'yes' or 'no' as the case
may be.  For something like asking for a password or username, you
actually want it to take a totally different path.  (But this could
still potentially be accomodated by returning None.)

Anyhow I think I convinced myself it's worth at least adding the patch.
Martin <http://launchpad.net/~mbp/>

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