diff-parseopt: convert -B|--break-rewrites

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

diff.c

@@ -4841,6 +4841,30 @@ static int parse_objfind_opt(struct diff_options *opt, const char *arg)
 	return 1;
 }
 
+static int diff_opt_break_rewrites(const struct option *opt,
+				   const char *arg, int unset)
+{
+	int *break_opt = opt->value;
+	int opt1, opt2;
+
+	BUG_ON_OPT_NEG(unset);
+	if (!arg)
+		arg = "";
+	opt1 = parse_rename_score(&arg);
+	if (*arg == 0)
+		opt2 = 0;
+	else if (*arg != '/')
+		return error(_("%s expects <n>/<m> form"), opt->long_name);
+	else {
+		arg++;
+		opt2 = parse_rename_score(&arg);
+	}
+	if (*arg != 0)
+		return error(_("%s expects <n>/<m> form"), opt->long_name);
+	*break_opt = opt1 | (opt2 << 16);
+	return 0;
+}
+
 static int diff_opt_char(const struct option *opt,
 			 const char *arg, int unset)
 {
@@ -5011,6 +5035,12 @@ static void prep_parse_options(struct diff_options *options)
 			       N_("specify the character to indicate a context instead of ' '"),
 			       PARSE_OPT_NONEG, diff_opt_char),
 
+		OPT_GROUP(N_("Diff rename options")),
+		OPT_CALLBACK_F('B', "break-rewrites", &options->break_opt, N_("<n>[/<m>]"),
+			       N_("break complete rewrite changes into pairs of delete and create"),
+			       PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
+			       diff_opt_break_rewrites),
+
 		OPT_GROUP(N_("Diff other options")),
 		{ OPTION_CALLBACK, 0, "output", options, N_("<file>"),
 		  N_("Output to a specific file"),
@@ -5044,12 +5074,7 @@ int diff_opt_parse(struct diff_options *options,
 		return ac;
 
 	/* renames options */
-	if (starts_with(arg, "-B") ||
-		 skip_to_optional_arg(arg, "--break-rewrites", NULL)) {
-		if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
-			return error("invalid argument to -B: %s", arg+2);
-	}
-	else if (starts_with(arg, "-M") ||
+	if (starts_with(arg, "-M") ||
 		 skip_to_optional_arg(arg, "--find-renames", NULL)) {
 		if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
 			return error("invalid argument to -M: %s", arg+2);
@@ -5328,17 +5353,14 @@ int parse_rename_score(const char **cp_p)
 
 static int diff_scoreopt_parse(const char *opt)
 {
-	int opt1, opt2, cmd;
+	int opt1, cmd;
 
 	if (*opt++ != '-')
 		return -1;
 	cmd = *opt++;
 	if (cmd == '-') {
 		/* convert the long-form arguments into short-form versions */
-		if (skip_prefix(opt, "break-rewrites", &opt)) {
-			if (*opt == 0 || *opt++ == '=')
-				cmd = 'B';
-		} else if (skip_prefix(opt, "find-copies", &opt)) {
+		if (skip_prefix(opt, "find-copies", &opt)) {
 			if (*opt == 0 || *opt++ == '=')
 				cmd = 'C';
 		} else if (skip_prefix(opt, "find-renames", &opt)) {
@@ -5346,25 +5368,13 @@ static int diff_scoreopt_parse(const char *opt)
 				cmd = 'M';
 		}
 	}
-	if (cmd != 'M' && cmd != 'C' && cmd != 'B')
-		return -1; /* that is not a -M, -C, or -B option */
+	if (cmd != 'M' && cmd != 'C')
+		return -1; /* that is not a -M, or -C option */
 
 	opt1 = parse_rename_score(&opt);
-	if (cmd != 'B')
-		opt2 = 0;
-	else {
-		if (*opt == 0)
-			opt2 = 0;
-		else if (*opt != '/')
-			return -1; /* we expect -B80/99 or -B80 */
-		else {
-			opt++;
-			opt2 = parse_rename_score(&opt);
-		}
-	}
 	if (*opt != 0)
 		return -1;
-	return opt1 | (opt2 << 16);
+	return opt1;
 }
 
 struct diff_queue_struct diff_queued_diff;