bool.go

/*
Copyright 2019 The Kubernetes Authors.

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 flagutil

import (
	"strconv"
)

// Bool holds a boolean flag value, tracking whether it was set explicitly.
type Bool struct {
	Value    bool
	Explicit bool
}

// IsBoolFlag causes golang to consider --foo to mean --foo=true
func (b *Bool) IsBoolFlag() bool {
	return true
}

// String value of the string.
func (b *Bool) String() string {
	return strconv.FormatBool(b.Value)
}

// Set the bool according to the string.
func (b *Bool) Set(s string) error {
	v, err := strconv.ParseBool(s)
	if err != nil {
		return err
	}
	b.Explicit = true
	b.Value = v
	return nil
}