submodule--helper: refactor resolve_relative_url() helper

Refactor the helper function to resolve a relative url, by reusing the
existing `compute_submodule_clone_url()` function.

`compute_submodule_clone_url()` performs the same work that
`resolve_relative_url()` is doing, so we eliminate this code repetition
by moving the former function's definition up, and calling it inside
`resolve_relative_url()`.

Signed-off-by: Atharva Raykar <raykar.ath@gmail.com>
Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Shourya Shukla <periperidip@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/submodule--helper.c

@@ -199,33 +199,46 @@ static char *relative_url(const char *remote_url,
 	return strbuf_detach(&sb, NULL);
 }
 
+static char *compute_submodule_clone_url(const char *rel_url, const char *up_path, int quiet)
+{
+	char *remoteurl, *resolved_url;
+	char *remote = get_default_remote();
+	struct strbuf remotesb = STRBUF_INIT;
+
+	strbuf_addf(&remotesb, "remote.%s.url", remote);
+	if (git_config_get_string(remotesb.buf, &remoteurl)) {
+		if (!quiet)
+			warning(_("could not look up configuration '%s'. "
+				  "Assuming this repository is its own "
+				  "authoritative upstream."),
+				remotesb.buf);
+		remoteurl = xgetcwd();
+	}
+	resolved_url = relative_url(remoteurl, rel_url, up_path);
+
+	free(remote);
+	free(remoteurl);
+	strbuf_release(&remotesb);
+
+	return resolved_url;
+}
+
 static int resolve_relative_url(int argc, const char **argv, const char *prefix)
 {
-	char *remoteurl = NULL;
-	char *remote = get_default_remote();
 	const char *up_path = NULL;
 	char *res;
 	const char *url;
-	struct strbuf sb = STRBUF_INIT;
 
 	if (argc != 2 && argc != 3)
 		die("resolve-relative-url only accepts one or two arguments");
 
 	url = argv[1];
-	strbuf_addf(&sb, "remote.%s.url", remote);
-	free(remote);
-
-	if (git_config_get_string(sb.buf, &remoteurl))
-		/* the repository is its own authoritative upstream */
-		remoteurl = xgetcwd();
-
 	if (argc == 3)
 		up_path = argv[2];
 
-	res = relative_url(remoteurl, url, up_path);
+	res = compute_submodule_clone_url(url, up_path, 1);
 	puts(res);
 	free(res);
-	free(remoteurl);
 	return 0;
 }
 
@@ -590,30 +603,6 @@ static int module_foreach(int argc, const char **argv, const char *prefix)
 	return 0;
 }
 
-static char *compute_submodule_clone_url(const char *rel_url, const char *up_path, int quiet)
-{
-	char *remoteurl, *resolved_url;
-	char *remote = get_default_remote();
-	struct strbuf remotesb = STRBUF_INIT;
-
-	strbuf_addf(&remotesb, "remote.%s.url", remote);
-	if (git_config_get_string(remotesb.buf, &remoteurl)) {
-		if (!quiet)
-			warning(_("could not look up configuration '%s'. "
-				  "Assuming this repository is its own "
-				  "authoritative upstream."),
-				remotesb.buf);
-		remoteurl = xgetcwd();
-	}
-	resolved_url = relative_url(remoteurl, rel_url, up_path);
-
-	free(remote);
-	free(remoteurl);
-	strbuf_release(&remotesb);
-
-	return resolved_url;
-}
-
 struct init_cb {
 	const char *prefix;
 	unsigned int flags;