From b7ab5b0c4823f439bba54438246d4be1bde49864 Mon Sep 17 00:00:00 2001
From: OneOfOne <oneofone@gmail.com>
Date: Thu, 31 Aug 2017 00:26:52 +0200
Subject: [PATCH] don't add -- prefix if we manually specify one

---
 flag.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/flag.go b/flag.go
index d5ab42e..9e71a51 100644
--- a/flag.go
+++ b/flag.go
@@ -778,7 +778,7 @@ func visibleFlags(fl []Flag) []Flag {
 func prefixFor(name string) (prefix string) {
 	if len(name) == 1 {
 		prefix = "-"
-	} else {
+	} else if name[0] != '-' {
 		prefix = "--"
 	}