test helpers: move test-* to t/helper/ subdirectory

This keeps top dir a bit less crowded. And because these programs are
for testing purposes, it makes sense that they stay somewhere in t/

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/helper/test-submodule-config.c

@@ -0,0 +1,76 @@
+#include "cache.h"
+#include "submodule-config.h"
+#include "submodule.h"
+
+static void die_usage(int argc, char **argv, const char *msg)
+{
+	fprintf(stderr, "%s\n", msg);
+	fprintf(stderr, "Usage: %s [<commit> <submodulepath>] ...\n", argv[0]);
+	exit(1);
+}
+
+static int git_test_config(const char *var, const char *value, void *cb)
+{
+	return parse_submodule_config_option(var, value);
+}
+
+int main(int argc, char **argv)
+{
+	char **arg = argv;
+	int my_argc = argc;
+	int output_url = 0;
+	int lookup_name = 0;
+
+	arg++;
+	my_argc--;
+	while (starts_with(arg[0], "--")) {
+		if (!strcmp(arg[0], "--url"))
+			output_url = 1;
+		if (!strcmp(arg[0], "--name"))
+			lookup_name = 1;
+		arg++;
+		my_argc--;
+	}
+
+	if (my_argc % 2 != 0)
+		die_usage(argc, argv, "Wrong number of arguments.");
+
+	setup_git_directory();
+	gitmodules_config();
+	git_config(git_test_config, NULL);
+
+	while (*arg) {
+		unsigned char commit_sha1[20];
+		const struct submodule *submodule;
+		const char *commit;
+		const char *path_or_name;
+
+		commit = arg[0];
+		path_or_name = arg[1];
+
+		if (commit[0] == '\0')
+			hashcpy(commit_sha1, null_sha1);
+		else if (get_sha1(commit, commit_sha1) < 0)
+			die_usage(argc, argv, "Commit not found.");
+
+		if (lookup_name) {
+			submodule = submodule_from_name(commit_sha1, path_or_name);
+		} else
+			submodule = submodule_from_path(commit_sha1, path_or_name);
+		if (!submodule)
+			die_usage(argc, argv, "Submodule not found.");
+
+		if (output_url)
+			printf("Submodule url: '%s' for path '%s'\n",
+					submodule->url, submodule->path);
+		else
+			printf("Submodule name: '%s' for path '%s'\n",
+					submodule->name, submodule->path);
+
+		arg += 2;
+	}
+
+	submodule_free();
+
+	return 0;
+}