multistring.go

// Copyright (c) Facebook, Inc. and its affiliates.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package main

import (
	"fmt"
)

// multiString is a custom type to be recognized by flag.Parse().
// It maps multiple occurances of the flag into slice of strings.
type multiString []string

// part of flag.Value interface implementation
func (ms *multiString) String() string {
	return fmt.Sprintf("%v", *ms)
}

// part of flag.Value interface implementation
func (ms *multiString) Set(val string) error {
	*ms = append(*ms, val)
	return nil
}