add (opt|arg).Repeats()

pkg/command/arguments.go

@@ -182,6 +182,11 @@ func (arg *Argument) SetValue(value []string) {
 	arg.provided = &value
 }
 
+// Repeats tells if an argument should be presented as a list.
+func (arg *Argument) Repeats() bool {
+	return arg.Variadic
+}
+
 func (arg *Argument) IsKnown() bool {
 	return arg.provided != nil && len(*arg.provided) > 0
 }

pkg/command/options.go

@@ -137,6 +137,11 @@ func (opt *Option) ToString() string {
 	return stringValue
 }
 
+// Repeats tells if an option should be presented as a list.
+func (opt *Option) Repeats() bool {
+	return opt.Repeated
+}
+
 func (opt *Option) internalValidate(name, current string) error {
 	if current == "" {
 		return nil