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[PATCH 4/4] git-status: report reference to superproject




In a submodule the position of HEAD in relation to the gitlink pointer
in the superproject may be of interest.

Introduce a config option `status.superprojectInfo` that when enabled
will report the relation between HEAD and the commit pointed to by the
gitlink in the index of the superproject.

Signed-off-by: Stefan Beller <sbeller@xxxxxxxxxx>
---
 Documentation/config.txt |  5 +++++
 builtin/commit.c         |  2 ++
 t/t7519-superproject.sh  | 57 ++++++++++++++++++++++++++++++++++++++++++++++++
 wt-status.c              | 37 +++++++++++++++++++++++++++++++
 wt-status.h              |  1 +
 5 files changed, 102 insertions(+)
 create mode 100755 t/t7519-superproject.sh

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 5f0d62753d..7825a1a7be 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -3097,6 +3097,11 @@ status.submoduleSummary::
 	submodule summary' command, which shows a similar output but does
 	not honor these settings.
 
+status.superprojectInfo
+	Defaults to false.
+	This shows the relation of the current HEAD to the commit pointed
+	to be the gitlink entry in the superprojects index.
+
 stash.showPatch::
 	If this is set to true, the `git stash show` command without an
 	option will show the stash entry in patch form.  Defaults to false.
diff --git a/builtin/commit.c b/builtin/commit.c
index c38542ee46..f937f6c6cf 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -1286,6 +1286,8 @@ static int git_status_config(const char *k, const char *v, void *cb)
 			s->submodule_summary = -1;
 		return 0;
 	}
+	if (!strcmp(k, "status.superprojectinfo"))
+		s->superproject_info = git_config_bool(k, v);
 	if (!strcmp(k, "status.short")) {
 		if (git_config_bool(k, v))
 			status_deferred_config.status_format = STATUS_FORMAT_SHORT;
diff --git a/t/t7519-superproject.sh b/t/t7519-superproject.sh
new file mode 100755
index 0000000000..ade2379a59
--- /dev/null
+++ b/t/t7519-superproject.sh
@@ -0,0 +1,57 @@
+
+
+test_description='git status for superproject relations'
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	test_commit initial &&
+	test_create_repo sub &&
+	# this whole file tests superproject reporting, so set this config here
+	git -C sub config status.superprojectInfo true
+'
+
+test_expect_success 'repo on initial commit does not mention superproject' '
+	git -C sub status > actual &&
+	test_i18ngrep "No commits yet" actual &&
+	test_i18ngrep -v superproject actual
+'
+
+test_expect_success 'setup submodule' '
+	test_commit -C sub initial &&
+	git submodule add ./sub sub
+'
+
+test_expect_success 'submodule in sync with superproject index' '
+	git -C sub status >actual &&
+	test_i18ngrep "superproject points at HEAD" actual
+'
+
+test_expect_success 'submodule in sync with superproject' '
+	git commit -a -m "superproject adds submodule" &&
+	git -C sub status >actual &&
+	test_i18ngrep "superproject points at HEAD" actual
+'
+
+test_expect_success 'submodule advances two commits' '
+	git -C sub commit --allow-empty -m "test" &&
+	git -C sub commit --allow-empty -m "test2" &&
+	git -C sub status >actual &&
+	test_i18ngrep "superproject is 2 commits behind HEAD" actual
+'
+
+test_expect_success 'submodule behind superproject' '
+	git add sub &&
+	git commit -m "update sub" &&
+	git -C sub reset --hard HEAD^ &&
+	git -C sub status >actual &&
+	test_i18ngrep "superproject is ahead of HEAD by 1 commits" actual
+'
+
+test_expect_success 'submodule and superproject differ' '
+	git -C sub commit --allow-empty -m "test2b" &&
+	git -C sub status >actual &&
+	test_i18ngrep "superproject and HEAD differ by +1, -1 commits" actual
+'
+
+test_done
diff --git a/wt-status.c b/wt-status.c
index bedef256ce..3e8e27a550 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -1027,6 +1027,41 @@ static void wt_longstatus_print_tracking(struct wt_status *s)
 	strbuf_release(&sb);
 }
 
+static void wt_longstatus_print_superproject_relation(struct wt_status *s)
+{
+	struct object_id oid;
+	struct commit *in_gitlink, *head;
+	int head_nr, gitlink_nr;
+
+	if (get_superproject_gitlink(&oid))
+		return;
+
+	in_gitlink = lookup_commit(&oid);
+
+	read_ref("HEAD", &oid);
+	head = lookup_commit(&oid);
+
+	compare_commits(head, in_gitlink, &head_nr, &gitlink_nr);
+
+	if (!head_nr && !gitlink_nr)
+		printf(_("superproject points at HEAD\n"));
+	else if (!head_nr)
+		printf(_("superproject is ahead of HEAD by %d commits %s..%s\n"),
+			 gitlink_nr,
+			 find_unique_abbrev(head->object.oid.hash, DEFAULT_ABBREV),
+			 find_unique_abbrev(in_gitlink->object.oid.hash, DEFAULT_ABBREV));
+	else if (!gitlink_nr)
+		printf(_("superproject is %d commits behind HEAD %s..%s\n"),
+			 head_nr,
+			 find_unique_abbrev(in_gitlink->object.oid.hash, DEFAULT_ABBREV),
+			 find_unique_abbrev(head->object.oid.hash, DEFAULT_ABBREV));
+	else
+		printf(_("superproject and HEAD differ by +%d, -%d commits %s...%s\n"),
+			 gitlink_nr, head_nr,
+			 find_unique_abbrev(head->object.oid.hash, DEFAULT_ABBREV),
+			 find_unique_abbrev(in_gitlink->object.oid.hash, DEFAULT_ABBREV));
+}
+
 static int has_unmerged(struct wt_status *s)
 {
 	int i;
@@ -1593,6 +1628,8 @@ static void wt_longstatus_print(struct wt_status *s)
 		if (!s->is_initial)
 			wt_longstatus_print_tracking(s);
 	}
+	if (!s->is_initial && s->superproject_info)
+		wt_longstatus_print_superproject_relation(s);
 
 	wt_longstatus_print_state(s, &state);
 	free(state.branch);
diff --git a/wt-status.h b/wt-status.h
index 64f4d33ea1..75700980d2 100644
--- a/wt-status.h
+++ b/wt-status.h
@@ -70,6 +70,7 @@ struct wt_status {
 	int display_comment_prefix;
 	int relative_paths;
 	int submodule_summary;
+	int superproject_info;
 	int show_ignored_files;
 	enum untracked_status_type show_untracked_files;
 	const char *ignore_submodule_arg;
-- 
2.15.0.128.g40905b34bf.dirty