Fix panic when parsing unknown flag followed by empty argument (#173)
Signed-off-by: Oren Shomron <shomron@gmail.com>
diff --git a/flag.go b/flag.go
index 5cc710c..9beeda8 100644
--- a/flag.go
+++ b/flag.go
@@ -925,13 +925,16 @@
}
first := args[0]
- if first[0] == '-' {
+ if len(first) > 0 && first[0] == '-' {
//--unknown --next-flag ...
return args
}
//--unknown arg ... (args will be arg ...)
- return args[1:]
+ if len(args) > 1 {
+ return args[1:]
+ }
+ return nil
}
func (f *FlagSet) parseLongArg(s string, args []string, fn parseFunc) (a []string, err error) {
diff --git a/flag_test.go b/flag_test.go
index f600f0a..7d02dbc 100644
--- a/flag_test.go
+++ b/flag_test.go
@@ -431,6 +431,11 @@
"--unknown8=unknown8value",
"--boole",
"--unknown6",
+ "",
+ "-uuuuu",
+ "",
+ "--unknown10",
+ "--unknown11",
}
want := []string{
"boola", "true",
