| /* |
| Copyright 2014 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 flag |
| |
| import ( |
| "fmt" |
| "strconv" |
| ) |
| |
| // Tristate is a flag compatible with flags and pflags that |
| // keeps track of whether it had a value supplied or not. |
| type Tristate int |
| |
| const ( |
| Unset Tristate = iota // 0 |
| True |
| False |
| ) |
| |
| func (f *Tristate) Default(value bool) { |
| *f = triFromBool(value) |
| } |
| |
| func (f Tristate) String() string { |
| b := boolFromTri(f) |
| return fmt.Sprintf("%t", b) |
| } |
| |
| func (f Tristate) Value() bool { |
| b := boolFromTri(f) |
| return b |
| } |
| |
| func (f *Tristate) Set(value string) error { |
| boolVal, err := strconv.ParseBool(value) |
| if err != nil { |
| return err |
| } |
| |
| *f = triFromBool(boolVal) |
| return nil |
| } |
| |
| func (f Tristate) Provided() bool { |
| if f != Unset { |
| return true |
| } |
| return false |
| } |
| |
| func (f *Tristate) Type() string { |
| return "tristate" |
| } |
| |
| func boolFromTri(t Tristate) bool { |
| if t == True { |
| return true |
| } else { |
| return false |
| } |
| } |
| |
| func triFromBool(b bool) Tristate { |
| if b { |
| return True |
| } else { |
| return False |
| } |
| } |