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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:   Thu, 17 Nov 2016 10:35:15 -0800
In-Reply-To: <CAOLa=ZSaTdACC60g6D6k5frjKkChbkBL8+kLJjNgoutLSe8mOQ@mail.gmail.com>
        (Karthik Nayak's message of "Wed, 16 Nov 2016 13:28:35 +0530")
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Karthik Nayak <karthik.188@gmail.com> writes:

> On Tue, Nov 15, 2016 at 11:12 PM, Junio C Hamano <gitster@pobox.com> wrote:
>> Jacob Keller <jacob.keller@gmail.com> writes:
>> ...
>> I think you are going in the right direction.  I had a similar
>> thought but built around a different axis.  I.e. if strip=1 strips
>> one from the left, perhaps we want to have rstrip=1 that strips one
>> from the right, and also strip=-1 to mean strip everything except
>> one from the left and so on?
> ...

> If we do implement strip with negative numbers, it definitely
> would be neat, but to get the desired feature which I've mentioned
> below, we'd need to call strip twice, i.e
> to get remotes from /refs/foo/abc/xyz we'd need to do
> strip=1,strip=-1, which could be
> done but ...

... would be unnecessary if this is the only use case:

> strbuf_addf(&fmt,
> "%%(if:notequals=remotes)%%(refname:base)%%(then)%s%%(else)%s%%(end)",
> local.buf, remote.buf);

You can "strip to leave only 2 components" and compare the result
with refs/remotes instead, no?