Re: [PATCH v3 1/2] diff: consolidate diff algorithm option parsing

> From: John Cai <johncai86@gmail.com>
>
> A subsequent commit will need the ability to tell if the diff algorithm
> was set through the command line through setting a new member of
> diff_options. While this logic can be added to the
> diff_opt_diff_algorithm() callback, the `--minimal` and `--histogram`
> options are handled via OPT_BIT without a callback.
>
> Remedy this by consolidating the options parsing logic for --minimal and
> --histogram into one callback. This way we can modify `diff_options` in
> that function.
>
> As an additional refactor, the logic that sets the diff algorithm in
> diff_opt_diff_algorithm() can be refactored into a helper that will
> allow multiple callsites to set the diff algorithm.
>
> Signed-off-by: John Cai <johncai86@gmail.com>
> ---
>  diff.c | 57 +++++++++++++++++++++++++++++++++++++++++++--------------
>  1 file changed, 43 insertions(+), 14 deletions(-)