From 49b6180252000e37ec47ccb4156240ed625949ed Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ren=C3=A9=20Scharfe?= <rene.scharfe@lsrfire.ath.cx>
Date: Sun, 8 Mar 2009 19:16:58 +0100
Subject: parseopt: make usage optional

Allow usagestr to be NULL and don't display any help screen in
this case.  This is useful to implement incremental parsers.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/parse-options.c b/parse-options.c
index 8b21dea..51e804b 100644
--- a/parse-options.c
+++ b/parse-options.c
@@ -364,6 +364,9 @@ int parse_options(int argc, const char **argv, const struct option *options,
 int usage_with_options_internal(const char * const *usagestr,
 				const struct option *opts, int full)
 {
+	if (!usagestr)
+		return PARSE_OPT_HELP;
+
 	fprintf(stderr, "usage: %s\n", *usagestr++);
 	while (*usagestr && **usagestr)
 		fprintf(stderr, "   or: %s\n", *usagestr++);
-- 
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