Re: [PATCH v2] grep.c: teach 'git grep --only-matching'

> Teach 'git grep --only-matching', a new option to only print the
> matching part(s) of a line.
>
> [ ... ]
>
> diff --git a/Documentation/git-grep.txt b/Documentation/git-grep.txt
> index 0de3493b80..078b4e3730 100644
> --- a/Documentation/git-grep.txt
> +++ b/Documentation/git-grep.txt
> @@ -17,7 +17,7 @@ SYNOPSIS
>  	   [-l | --files-with-matches] [-L | --files-without-match]
>  	   [(-O | --open-files-in-pager) [<pager>]]
>  	   [-z | --null]
> -	   [-c | --count] [--all-match] [-q | --quiet]
> +	   [ -o | --only-matching ] [-c | --count] [--all-match] [-q | --quiet]
>  	   [--max-depth <depth>]
>  	   [--color[=<when>] | --no-color]
>  	   [--break] [--heading] [-p | --show-function]
> @@ -201,6 +201,10 @@ providing this option will cause it to die.
>  	Output \0 instead of the character that normally follows a
>  	file name.
>
> +-o::
> +--only-matching::
> +	Output only the matching part of the lines.