feat: StringsOption with delimiter

cli/parse.go

@@ -100,7 +100,7 @@ func setOpts(kv kv, kvType reflect.Kind, opts cmds.OptMap) error {
 
 	if kvType == cmds.Strings {
 		res, _ := opts[kv.Key].([]string)
-		opts[kv.Key] = append(res, kv.Value.(string))
+		opts[kv.Key] = append(res, kv.Value.([]string)...)
 	} else if _, exists := opts[kv.Key]; !exists {
 		opts[kv.Key] = kv.Value
 	} else {

option.go

@@ -184,6 +184,38 @@ func FloatOption(names ...string) Option {
 func StringOption(names ...string) Option {
 	return NewOption(String, names...)
 }
+
+// StringsOption is a command option that takes which returns a slice of strings. When parsing
 func StringsOption(names ...string) Option {
-	return NewOption(Strings, names...)
+	return DelimitedStringsOption("", names...)
+}
+
+func DelimitedStringsOption(delimiter string, names ...string) Option {
+	return &stringsOption{
+		Option:    NewOption(Strings, names...),
+		delimiter: delimiter,
+	}
+}
+
+type stringsOption struct {
+	Option
+	delimiter string
+}
+
+func (s *stringsOption) WithDefault(v interface{}) Option {
+	if v == nil {
+		return s.WithDefault(v)
+	}
+
+	defVal := v.([]string)
+	s.Option = s.Option.WithDefault(defVal)
+	return s
+}
+
+func (s *stringsOption) Parse(v string) (interface{}, error) {
+	if s.delimiter == "" {
+		return []string{v}, nil
+	}
+
+	return strings.Split(v, s.delimiter), nil
 }