Re: [PATCH 3/3] builtin/grep: allow implicit --no-index

[Junio C Hamano <gitster@pobox.com>]

Junio C Hamano <gitster@pobox.com> writes:

> I however fail to see why that necessitates to change use_index to
> no_index, making the code harder to follow by introducing double
> negation.

Oh, perhaps your thinking is that there are multiple ways that
use_index can become 0 (i.e. it could come from the config, could
come from an explicit --no-index, or it could come from the new
default behaviour), and the error messages deep in the callchain
(long after option parsing is done) want to react to these
differences.

To that I am somewhat sympathetic, but then use_index can become 1
(rather, no_index can become 0) in multiple ways (i.e. it can be
because the user is just using the command as designed for its
primary use case, or the user explicitly said --no-no-index), so I
am not sure.

In either case, I do not have a strong objection.  Avoiding double
negation is merely a moderately strong general preference.