[PATCH] parse-options: introduce OPT_IPVERSION()

[Junio C Hamano <gitster@pobox.com>]

The command line option parsing for "git clone", "git fetch", and
"git push" have duplicated implementations of parsing "--ipv4" and
"--ipv6" options, by having two OPT_SET_INT() for "ipv4" and "ipv6".

Introduce a new OPT_IPVERSION() macro and use it in these three
commands.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 * No changes in behaviour (yet).  Notably, they still accept
   "--no-ipv4" and do nonsensical things.

 builtin/clone.c | 5 +----
 builtin/fetch.c | 5 +----
 builtin/push.c  | 5 +----
 parse-options.h | 6 ++++++
 4 files changed, 9 insertions(+), 12 deletions(-)

diff --git c/builtin/clone.c w/builtin/clone.c
index 15f9912b4c..6c9ad9b621 100644
--- c/builtin/clone.c
+++ w/builtin/clone.c
@@ -161,10 +161,7 @@ static struct option builtin_clone_options[] = {
 			N_("set config inside the new repository")),
 	OPT_STRING_LIST(0, "server-option", &server_options,
 			N_("server-specific"), N_("option to transmit")),
-	OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
-			TRANSPORT_FAMILY_IPV4),
-	OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
-			TRANSPORT_FAMILY_IPV6),
+	OPT_IPVERSION(&family),
 	OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
 	OPT_BOOL(0, "also-filter-submodules", &option_filter_submodules,
 		    N_("apply partial clone filters to submodules")),
diff --git c/builtin/fetch.c w/builtin/fetch.c
index 849a9be421..0b5cadc12a 100644
--- c/builtin/fetch.c
+++ w/builtin/fetch.c
@@ -2193,10 +2193,7 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
 		OPT_CALLBACK_F(0, "refmap", NULL, N_("refmap"),
 			       N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg),
 		OPT_STRING_LIST('o', "server-option", &server_options, N_("server-specific"), N_("option to transmit")),
-		OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
-				TRANSPORT_FAMILY_IPV4),
-		OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
-				TRANSPORT_FAMILY_IPV6),
+		OPT_IPVERSION(&family),
 		OPT_STRING_LIST(0, "negotiation-tip", &negotiation_tip, N_("revision"),
 				N_("report that we have only objects reachable from this object")),
 		OPT_BOOL(0, "negotiate-only", &negotiate_only,
diff --git c/builtin/push.c w/builtin/push.c
index dbdf609daf..aa28fdba0e 100644
--- c/builtin/push.c
+++ w/builtin/push.c
@@ -627,10 +627,7 @@ int cmd_push(int argc, const char **argv, const char *prefix)
 				PARSE_OPT_OPTARG, option_parse_push_signed),
 		OPT_BIT(0, "atomic", &flags, N_("request atomic transaction on remote side"), TRANSPORT_PUSH_ATOMIC),
 		OPT_STRING_LIST('o', "push-option", &push_options_cmdline, N_("server-specific"), N_("option to transmit")),
-		OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
-				TRANSPORT_FAMILY_IPV4),
-		OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
-				TRANSPORT_FAMILY_IPV6),
+		OPT_IPVERSION(&family),
 		OPT_END()
 	};
 
diff --git c/parse-options.h w/parse-options.h
index 8e48efe524..e35710733d 100644
--- c/parse-options.h
+++ w/parse-options.h
@@ -581,4 +581,10 @@ int parse_opt_tracking_mode(const struct option *, const char *, int);
 #define OPT_PATHSPEC_FILE_NUL(v)  OPT_BOOL(0, "pathspec-file-nul", v, N_("with --pathspec-from-file, pathspec elements are separated with NUL character"))
 #define OPT_AUTOSTASH(v) OPT_BOOL(0, "autostash", v, N_("automatically stash/stash pop before and after"))
 
+#define OPT_IPVERSION(v) \
+	OPT_SET_INT('4', "ipv4", (v), N_("use IPv4 addresses only"), \
+		TRANSPORT_FAMILY_IPV4), \
+	OPT_SET_INT('6', "ipv6", (v), N_("use IPv6 addresses only"), \
+		TRANSPORT_FAMILY_IPV6)
+
 #endif