[PATCH 3/3] parse-options: make sure argh string does not have SP or _

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

We encourage to spell an argument hint that consists of multiple
words as a single-token separated with dashes.  In order to help
catching violations added by new callers of parse-options, make sure
argh does not contain SP or _ when the code validates the option
definitions.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 parse-options.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/parse-options.c b/parse-options.c
index a5fa0b8..c81d3a0 100644
--- a/parse-options.c
+++ b/parse-options.c
@@ -375,6 +375,9 @@ static void parse_options_check(const struct option *opts)
 		default:
 			; /* ok. (usually accepts an argument) */
 		}
+		if (opts->argh &&
+		    strcspn(opts->argh, " _") != strlen(opts->argh))
+			err |= optbug(opts, "multi-word argh should use dash to separate words");
 	}
 	if (err)
 		exit(128);
-- 
1.9.1-471-gcccbd8b