Method getFlagType

flag.go:404–422

func to return a given type for a given flag name

(name string, ftype string, convFunc func(sval string) (interface{}, error))

// func to return a given type for a given flag name
func (f *FlagSet) getFlagType(name string, ftype string, convFunc func(sval string) (interface{}, error)) (interface{}, error) {
	flag := f.Lookup(name)
	if flag == nil {
		err := &NotExistError{name: name, messageType: flagNotDefinedMessage}
		return nil, err
	}

	if flag.Value.Type() != ftype {
		err := fmt.Errorf("trying to get %s value of flag of type %s", ftype, flag.Value.Type())
		return nil, err
	}

	sval := flag.Value.String()
	result, err := convFunc(sval)
	if err != nil {
		return nil, err
	}
	return result, nil
}

// ArgsLenAtDash will return the length of f.Args at the moment when a -- was
// found during arg parsing. This allows your program to know which args were