Fix handling of -- termination

Fix handling of -- termination. Previously, if you ran

$command -flag1 -etc -- some args after

the command's args would be doubled (some args after some args after).
Additionally, if there were items after the -- termination that looked
like flags, the parser would throw an error. It's better to terminate
parsing when -- is seen, because that usually indicates the caller wants
to pass the remainder of the arguments (including flags) as-is to
something else.

1 files changed, 5 insertions, 0 deletions

diff --git a/flag.go b/flag.go
index 2e4cac0..ad65dda 100644
--- a/flag.go
+++ b/flag.go
@@ -543,6 +543,11 @@ func (f *FlagSet) parseArgs(args []string) (err error) {
 
 		if s[1] == '-' {
 			args, err = f.parseLongArg(s, args)
+
+			if len(s) == 2 {
+				// stop parsing after --
+				break
+			}
 		} else {
 			args, err = f.parseShortArg(s, args)
 		}