Re: [PATCH 2/2] builtin/grep.c: teach '-o', '--only-matching' to 'git-grep'

From: Eric Sunshine <sunshine@sunshineco.com>
Date: May 5, 2018, 07:36 UTC
Message-ID: <CAPig+cSRJWW4-7vj6wK8aOfNB20bqUCSOOySjdPci1r5Vb83Uw@mail.gmail.com>
In-Reply-To: <c8b527c5de3b0e5422d2c1afb91d454d1e46fff4.1525492696.git.me@ttaylorr.com>

On Sat, May 5, 2018 at 12:03 AM, Taylor Blau <me@ttaylorr.com> wrote:

Show 13 quoted lines

> Teach GNU grep(1)'s '-o' ('--only-matching') to 'git-grep'. This option
> prints only the matching components of each line. It writes multiple
> lines if more than one match exists on a given line.
>
> For example:
>
>   $ git grep -on --column --heading git -- README.md | head -3
>   README.md
>   15:56:git
>   18:20:git
>
> By using show_line_header(), 'git grep --only-matching' correctly
> respects the '--header' option:

What is the '--header' option? I don't see it used in any example.

Show 5 quoted lines

>   $ git grep -on --column --heading git -- README.md | head -4
>   README.md
>   15:56:git
>   18:20:git
>   19:16:git

How does this example differ from the earlier example (other than showing 4 lines of output rather than 3)?

> Signed-off-by: Taylor Blau <me@ttaylorr.com>