Jacob Keller <jacob.e.kel...@intel.com> writes:

> From: Jacob Keller <jacob.kel...@gmail.com>
> Teach git-diff and friends a new format for displaying the difference of
> a submodule using git-diff inside the submodule project. This allows
> users to easily see exactly what source changed in a given commit that
> updates the submodule pointer. To do this, remove DIFF_SUBMODULE_LOG bit
> from the diff options, and instead add a new enum type for these
> formats.
> Signed-off-by: Jacob Keller <jacob.kel...@gmail.com>
> ---
>  Documentation/diff-config.txt  |  3 +-
>  Documentation/diff-options.txt |  6 ++--
>  diff.c                         | 41 ++++++++++++++++----------
>  diff.h                         |  9 +++++-
>  submodule.c                    | 67 
> ++++++++++++++++++++++++++++++++++++++++++
>  submodule.h                    |  6 ++++
>  6 files changed, 113 insertions(+), 19 deletions(-)

This looks good.

You'd want some tests to make sure that the "--submodule" and the
"--submodule=<format>" command line options and the diff.submodule
configuration variables are parsed correctly (and when combined, the
command line option overrides the configured default), and of course
the machinery does the right thing, with and without "--graph" when
used in "git log".

> diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
> index e7b729f3644f..988068225463 100644
> --- a/Documentation/diff-options.txt
> +++ b/Documentation/diff-options.txt
> @@ -215,8 +215,10 @@ any of those replacements occurred.
>       the commits in the range like linkgit:git-submodule[1] `summary` does.
>       Omitting the `--submodule` option or specifying `--submodule=short`,
>       uses the 'short' format. This format just shows the names of the commits
> -     at the beginning and end of the range.  Can be tweaked via the
> -     `diff.submodule` configuration variable.
> +     at the beginning and end of the range. When `--submodule=diff` is
> +     given, the 'diff' format is used. This format shows the diff between
> +     the old and new submodule commmit from the perspective of the
> +     submodule.  Can be tweaked via the `diff.submodule` configuration 
> variable.

This is carried over from the existing text, but "Can be tweaked
via" sounds a bit wasteful (and strange); "Defaults to" (or "The
default is taken from") is the phrase we seem to use more often.

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