parse-options: introduce die_for_incompatible_opt2()

The functions die_for_incompatible_opt3() and
die_for_incompatible_opt4() already exist to die whenever a user
specifies three or four options respectively that are not compatible.

Introduce die_for_incompatible_opt2() which dies when two options that
are incompatible are set.

Signed-off-by: Toon Claes <toon@iotcl.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: To1ne

builtin/replay.c

@@ -163,9 +163,10 @@ static void determine_replay_mode(struct rev_cmdline_info *cmd_info,
 	get_ref_information(cmd_info, &rinfo);
 	if (!rinfo.positive_refexprs)
 		die(_("need some commits to replay"));
-	if (onto_name && *advance_name)
-		die(_("--onto and --advance are incompatible"));
-	else if (onto_name) {
+
+	die_for_incompatible_opt2(!!onto_name, "--onto",
+				  !!*advance_name, "--advance");
+	if (onto_name) {
 		*onto = peel_committish(onto_name);
 		if (rinfo.positive_refexprs <
 		    strset_get_size(&rinfo.positive_refs))

parse-options.h

@@ -436,6 +436,15 @@ static inline void die_for_incompatible_opt3(int opt1, const char *opt1_name,
 				  0, "");
 }
 
+static inline void die_for_incompatible_opt2(int opt1, const char *opt1_name,
+					     int opt2, const char *opt2_name)
+{
+	die_for_incompatible_opt4(opt1, opt1_name,
+				  opt2, opt2_name,
+				  0, "",
+				  0, "");
+}
+
 /*
  * Use these assertions for callbacks that expect to be called with NONEG and
  * NOARG respectively, and do not otherwise handle the "unset" and "arg"