From: Junio C Hamano <gitster@pobox.com>
Date: Wed, 26 Aug 2015 15:44:07 GMT
Subject: Re: [PATCH v13 00/12] port tag.c to use ref-filter APIs
Message-ID: <xmqqy4gyukag.fsf@gitster.dls.corp.google.com>
In-Reply-To: <vpqd1yap8ml.fsf@anie.imag.fr>

Matthieu Moy <Matthieu.Moy@grenoble-inp.fr> writes:

>> For the current code %(if:empty)%(align)%(end)%(then)Empty%(else)Not Empty%(end)
>> would print non-empty, I guess the documentation holds in that case.
>> Not sure if we require it to print non-empty.
>
> You don't want the %(if) condition to depend on whether
> --shell/--python/... is used. Since %(if:empty)%(align)%(end)%(then)
> holds when you don't use --shell, you also want it to hold when you
> quote. IOW, you should check for emptyness before (or actually without)
> doing the quoting. I guess this is what you're doing, and if so, I think
> it's "The Right Thing".

I agree that %(align)%(end) should expand to empty and %(if:empty)...%(then)
should look at that empty string without quoting.  So 

    %(if:empty)%(align)%(end)%(then)Empty%(else)Not Empty%(end)

should give "Empty"; otherwise the code is buggy, I think.