fetch: refactor calculation of remote list

Separate out the calculation of remotes to be fetched from and the
actual fetching. This will allow us to include an additional step before
the actual fetching in a subsequent commit.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/fetch.c

@@ -1322,7 +1322,7 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
 {
 	int i;
 	struct string_list list = STRING_LIST_INIT_DUP;
-	struct remote *remote;
+	struct remote *remote = NULL;
 	int result = 0;
 	struct argv_array argv_gc_auto = ARGV_ARRAY_INIT;
 
@@ -1367,17 +1367,14 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
 		else if (argc > 1)
 			die(_("fetch --all does not make sense with refspecs"));
 		(void) for_each_remote(get_one_remote_for_fetch, &list);
-		result = fetch_multiple(&list);
 	} else if (argc == 0) {
 		/* No arguments -- use default remote */
 		remote = remote_get(NULL);
-		result = fetch_one(remote, argc, argv);
 	} else if (multiple) {
 		/* All arguments are assumed to be remotes or groups */
 		for (i = 0; i < argc; i++)
 			if (!add_remote_or_group(argv[i], &list))
 				die(_("No such remote or remote group: %s"), argv[i]);
-		result = fetch_multiple(&list);
 	} else {
 		/* Single remote or group */
 		(void) add_remote_or_group(argv[0], &list);
@@ -1385,14 +1382,19 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
 			/* More than one remote */
 			if (argc > 1)
 				die(_("Fetching a group and specifying refspecs does not make sense"));
-			result = fetch_multiple(&list);
 		} else {
 			/* Zero or one remotes */
 			remote = remote_get(argv[0]);
-			result = fetch_one(remote, argc-1, argv+1);
+			argc--;
+			argv++;
 		}
 	}
 
+	if (remote)
+		result = fetch_one(remote, argc, argv);
+	else
+		result = fetch_multiple(&list);
+
 	if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
 		struct argv_array options = ARGV_ARRAY_INIT;