send params to govalidator custom messages issue #79

[aliworkshop]

hey everyone!

if rules changes like this we can send params to custom messages

AddCustomRule("max", func(field string, rule string, message string, value interface{}) error {
		mustLen := strings.TrimPrefix(rule, "max:")
		lenInt, err := strconv.Atoi(mustLen)
		if err != nil {
			panic(errStringToInt)
		}
		lenFloat, err := strconv.ParseFloat(mustLen, 64)
		if err != nil {
			panic(errStringToFloat)
		}
		errMsg := fmt.Errorf("The %s field value can not be greater than %d", field, lenInt)
		if message != "" {
			errMsg = fmt.Errorf(message, lenInt)
		}
		errMsgFloat := fmt.Errorf("The %s field value can not be greater than %f", field, lenFloat)
		if message != "" {
			errMsgFloat = fmt.Errorf(message, lenFloat)
		}
		rv := reflect.ValueOf(value)
		switch rv.Kind() {
		case reflect.String:
			inLen := rv.Len()
			if inLen > lenInt {
				if message != "" {
					return fmt.Errorf(message, lenInt)
				}
				return fmt.Errorf("The %s field must be maximum %d char", field, lenInt)
			}
...

and use such as this

	messages := govalidator.MapData{
		"title": []string{"required: Is Required"},
		"description":    []string{"required: Is Required","max: must be %d chars maximum"},
		"file:image": []string{"required: Is Required"},
		"file:file": []string{"required: Is Required"},
	}

[coveralls]

Coverage decreased (-0.06%) to 89.256% when pulling fa05c58 on master into 02db365 on dev.