feat: StringsOption.Parse(string) now returns a slice containing the original...

feat: StringsOption.Parse(string) now returns a slice containing the original string. Added DelimitedStringsOption which allows passing delimited options on the CLI, such as --option=opt1,opt2 when the delimiter is a comma, instead of requiring the longer form --option=op1 --option=opt2

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 +184,44 @@ func FloatOption(names ...string) Option {
 func StringOption(names ...string) Option {
 	return NewOption(String, names...)
 }
+
+// StringsOption is a command option that can handle a slice of strings
 func StringsOption(names ...string) Option {
-	return NewOption(Strings, names...)
+	return DelimitedStringsOption("", names...)
+}
+
+// DelimitedStringsOption like StringsOption is a command option that can handle a slice of strings.
+// However, DelimitedStringsOption will automatically break up the associated CLI inputs based on the delimiter.
+// For example, instead of passing `command --option=val1 --option=val2` you can pass `command --option=val1,val2` or
+// even `command --option=val1,val2 --option=val3,val4`.
+//
+// A delimiter of "" means that no delimiter is used
+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.Option.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
 }