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From:   Junio C Hamano <gitster@pobox.com>
To:     Karthik Nayak <karthik.188@gmail.com>
Cc:     Jacob Keller <jacob.keller@gmail.com>,
        Git mailing list <git@vger.kernel.org>
Subject: Re: [PATCH v7 13/17] ref-filter: add `:dir` and `:base` options for ref printing atoms
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Date:   Mon, 14 Nov 2016 11:51:35 -0800
In-Reply-To: <CAOLa=ZSFuq2+6xsrJ=CcXuOVbTnbDirbRtu7Fonfk+9EdRpbxg@mail.gmail.com>
        (Karthik Nayak's message of "Tue, 15 Nov 2016 01:06:45 +0530")
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Karthik Nayak <karthik.188@gmail.com> writes:

>>  - More importantly, what do these do?  I do not think of a good
>>    description that generalizes "base of refs/foo/bar/boz is foo" to
>>    explain your :base.
>
> $ ./git for-each-ref --format "%(refname)%(end) %(refname:dir)"
> refs/heads/master                  refs/heads
> refs/heads/ref-filter                refs/heads
> refs/remotes/junio/va/i18n     refs/remotes/junio/va
>
> $ ./git for-each-ref  refs/heads --format
> "%(align:left,30)%(refname)%(end) %(refname:base)"
> refs/heads/master                 heads
> refs/heads/ref-filter                heads
> refs/remotes/junio/va/i18n     remotes
>
> I guess this should clear it up.

Hmph.

I would guess from these examples that :dir is an equivalent to
dirname().  But it is unclear how :base is defined.  Is it the path
component that comes immediately after "refs/" that appears at the
beginning?