[PATCH 11/15] diff: ignore submodules excluded by groups

[Stefan Beller <sbeller@google.com>]

We do not need to do anything special to initialize the `submodule_groups`
pointer as the diff options setup will fill in 0 by default.

Signed-off-by: Stefan Beller <sbeller@google.com>
---
 diff.c | 3 +++
 diff.h | 1 +
 2 files changed, 4 insertions(+)

diff --git a/diff.c b/diff.c
index 059123c..5808d8a 100644
--- a/diff.c
+++ b/diff.c
@@ -4921,10 +4921,13 @@ static int is_submodule_ignored(const char *path, struct diff_options *options)
 {
 	int ignored = 0;
 	unsigned orig_flags = options->flags;
+	const struct submodule *sub = submodule_from_path(null_sha1, path);
 	if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
 		set_diffopt_flags_from_submodule_config(options, path);
 	if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
 		ignored = 1;
+	if (!submodule_in_group(options->submodule_groups, sub))
+		ignored = 1;
 	options->flags = orig_flags;
 	return ignored;
 }
diff --git a/diff.h b/diff.h
index e7d68ed..7d499fb 100644
--- a/diff.h
+++ b/diff.h
@@ -178,6 +178,7 @@ struct diff_options {
 	void *output_prefix_data;
 
 	int diff_path_counter;
+	struct string_list *submodule_groups;
 };
 
 enum color_diff {
-- 
2.8.0.41.g8d9aeb3