parse-options: add new function "usage_msg_opt"

This function can be used instead of "usage_with_options" when you
want to print an error message before the usage string.

It may be useful because:

if (condition)
	usage_msg_opt("condition is false", usage, opts);

is shorter than:

if (condition) {
	fprintf(stderr, "condition is false\n\n");
	usage_with_options(usage, opts);
}

and may be more consistent.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/builtin-replace.c b/builtin-replace.c
index e3767b9..8220d6e 100644
--- a/builtin-replace.c
+++ b/builtin-replace.c
@@ -121,7 +121,7 @@ int cmd_replace(int argc, const char **argv, const char *prefix)
 		OPT_END()
 	};
 
-	argc = parse_options(argc, argv, options, git_replace_usage, 0);
+	argc = parse_options(argc, argv, prefix, options, git_replace_usage, 0);
 
 	if (list && delete)
 		usage_with_options(git_replace_usage, options);