reset.c: extract function for parsing arguments

Declutter cmd_reset() a bit by moving out the argument parsing to its
own function.

Signed-off-by: Martin von Zweigbergk <martinvonz@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/reset.c

@@ -198,36 +198,11 @@ static void die_if_unmerged_cache(int reset_type)
 
 }
 
-int cmd_reset(int argc, const char **argv, const char *prefix)
+static const char **parse_args(int argc, const char **argv, const char *prefix, const char **rev_ret)
 {
-	int i = 0, reset_type = NONE, update_ref_status = 0, quiet = 0;
-	int patch_mode = 0;
+	int i = 0;
 	const char *rev = "HEAD";
-	unsigned char sha1[20], *orig = NULL, sha1_orig[20],
-				*old_orig = NULL, sha1_old_orig[20];
-	const char **pathspec = NULL;
-	struct commit *commit;
-	struct strbuf msg = STRBUF_INIT;
-	const struct option options[] = {
-		OPT__QUIET(&quiet, N_("be quiet, only report errors")),
-		OPT_SET_INT(0, "mixed", &reset_type,
-						N_("reset HEAD and index"), MIXED),
-		OPT_SET_INT(0, "soft", &reset_type, N_("reset only HEAD"), SOFT),
-		OPT_SET_INT(0, "hard", &reset_type,
-				N_("reset HEAD, index and working tree"), HARD),
-		OPT_SET_INT(0, "merge", &reset_type,
-				N_("reset HEAD, index and working tree"), MERGE),
-		OPT_SET_INT(0, "keep", &reset_type,
-				N_("reset HEAD but keep local changes"), KEEP),
-		OPT_BOOLEAN('p', "patch", &patch_mode, N_("select hunks interactively")),
-		OPT_END()
-	};
-
-	git_config(git_default_config, NULL);
-
-	argc = parse_options(argc, argv, prefix, options, git_reset_usage,
-						PARSE_OPT_KEEP_DASHDASH);
-
+	unsigned char unused[20];
 	/*
 	 * Possible arguments are:
 	 *
@@ -250,7 +225,7 @@ int cmd_reset(int argc, const char **argv, const char *prefix)
 		 * Otherwise, argv[i] could be either <rev> or <paths> and
 		 * has to be unambiguous.
 		 */
-		else if (!get_sha1_committish(argv[i], sha1)) {
+		else if (!get_sha1_committish(argv[i], unused)) {
 			/*
 			 * Ok, argv[i] looks like a rev; it should not
 			 * be a filename.
@@ -262,6 +237,40 @@ int cmd_reset(int argc, const char **argv, const char *prefix)
 			verify_filename(prefix, argv[i], 1);
 		}
 	}
+	*rev_ret = rev;
+	return i < argc ? get_pathspec(prefix, argv + i) : NULL;
+}
+
+int cmd_reset(int argc, const char **argv, const char *prefix)
+{
+	int reset_type = NONE, update_ref_status = 0, quiet = 0;
+	int patch_mode = 0;
+	const char *rev;
+	unsigned char sha1[20], *orig = NULL, sha1_orig[20],
+				*old_orig = NULL, sha1_old_orig[20];
+	const char **pathspec = NULL;
+	struct commit *commit;
+	struct strbuf msg = STRBUF_INIT;
+	const struct option options[] = {
+		OPT__QUIET(&quiet, N_("be quiet, only report errors")),
+		OPT_SET_INT(0, "mixed", &reset_type,
+						N_("reset HEAD and index"), MIXED),
+		OPT_SET_INT(0, "soft", &reset_type, N_("reset only HEAD"), SOFT),
+		OPT_SET_INT(0, "hard", &reset_type,
+				N_("reset HEAD, index and working tree"), HARD),
+		OPT_SET_INT(0, "merge", &reset_type,
+				N_("reset HEAD, index and working tree"), MERGE),
+		OPT_SET_INT(0, "keep", &reset_type,
+				N_("reset HEAD but keep local changes"), KEEP),
+		OPT_BOOLEAN('p', "patch", &patch_mode, N_("select hunks interactively")),
+		OPT_END()
+	};
+
+	git_config(git_default_config, NULL);
+
+	argc = parse_options(argc, argv, prefix, options, git_reset_usage,
+						PARSE_OPT_KEEP_DASHDASH);
+	pathspec = parse_args(argc, argv, prefix, &rev);
 
 	if (get_sha1_committish(rev, sha1))
 		die(_("Failed to resolve '%s' as a valid ref."), rev);
@@ -277,9 +286,6 @@ int cmd_reset(int argc, const char **argv, const char *prefix)
 		die(_("Could not parse object '%s'."), rev);
 	hashcpy(sha1, commit->object.sha1);
 
-	if (i < argc)
-		pathspec = get_pathspec(prefix, argv + i);
-
 	if (patch_mode) {
 		if (reset_type != NONE)
 			die(_("--patch is incompatible with --{hard,mixed,soft}"));