Re: [PATCH 2/5] shallow: extract a header file for shallow-related functions

> There are many functions in commit.h that are more related to shallow
> repositories than they are to any sort of generic commit machinery.
> Likely this began when there were only a few shallow-related functions,
> and commit.h seemed a reasonable enough place to put them.
>
> But, now there are a good number of shallow-related functions, and
> placing them all in 'commit.h' doesn't make sense.
>
> This patch extracts a 'shallow.h', which takes all of the headers from

> 'commit.h' for functions which already exist in 'shallow.c'. We will
> bring the remaining shallow-related functions defined in 'commit.c' in a
> subsequent patch.
>
> For now, move only the ones that already are implemented in 'shallow.c',
> and update the necessary includes.
>
> Signed-off-by: Taylor Blau <me@ttaylorr.com>