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84 lines
1.5 KiB
Go
84 lines
1.5 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package flag
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import (
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"fmt"
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"strconv"
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)
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// Tristate is a flag compatible with flags and pflags that
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// keeps track of whether it had a value supplied or not.
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type Tristate int
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const (
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Unset Tristate = iota // 0
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True
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False
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)
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func (f *Tristate) Default(value bool) {
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*f = triFromBool(value)
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}
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func (f Tristate) String() string {
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b := boolFromTri(f)
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return fmt.Sprintf("%t", b)
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}
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func (f Tristate) Value() bool {
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b := boolFromTri(f)
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return b
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}
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func (f *Tristate) Set(value string) error {
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boolVal, err := strconv.ParseBool(value)
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if err != nil {
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return err
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}
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*f = triFromBool(boolVal)
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return nil
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}
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func (f Tristate) Provided() bool {
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if f != Unset {
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return true
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}
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return false
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}
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func (f *Tristate) Type() string {
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return "tristate"
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}
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func boolFromTri(t Tristate) bool {
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if t == True {
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return true
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} else {
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return false
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}
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}
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func triFromBool(b bool) Tristate {
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if b {
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return True
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} else {
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return False
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}
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}
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