text: package pflag
  
  import "strconv"
  
  // optional interface to indicate boolean flags that can be
  // supplied without "=value" text
  type boolFlag interface {
  	Value
  	IsBoolFlag() bool
  }
  
  // -- bool Value
  type boolValue bool
  
  func newBoolValue(val bool, p *bool) *boolValue {
  	*p = val
  	return (*boolValue)(p)
  }
  
  func (b *boolValue) Set(s string) error {
  	v, err := strconv.ParseBool(s)
  	*b = boolValue(v)
  	return err
  }
  
  func (b *boolValue) Type() string {
  	return "bool"
  }
  
  func (b *boolValue) String() string { return strconv.FormatBool(bool(*b)) }
  
  func (b *boolValue) IsBoolFlag() bool { return true }
  
  func boolConv(sval string) (interface{}, error) {
  	return strconv.ParseBool(sval)
  }
  
  // GetBool return the bool value of a flag with the given name
  func (f *FlagSet) GetBool(name string) (bool, error) {
  	val, err := f.getFlagType(name, "bool", boolConv)
  	if err != nil {
  		return false, err
  	}
  	return val.(bool), nil
  }
  
  // BoolVar defines a bool flag with specified name, default value, and usage string.
  // The argument p points to a bool variable in which to store the value of the flag.
  func (f *FlagSet) BoolVar(p *bool, name string, value bool, usage string) {
  	f.BoolVarP(p, name, "", value, usage)
  }
  
  // BoolVarP is like BoolVar, but accepts a shorthand letter that can be used after a single dash.
  func (f *FlagSet) BoolVarP(p *bool, name, shorthand string, value bool, usage string) {
  	flag := f.VarPF(newBoolValue(value, p), name, shorthand, usage)
  	flag.NoOptDefVal = "true"
  }
  
  // BoolVar defines a bool flag with specified name, default value, and usage string.
  // The argument p points to a bool variable in which to store the value of the flag.
  func BoolVar(p *bool, name string, value bool, usage string) {
  	BoolVarP(p, name, "", value, usage)
  }
  
  // BoolVarP is like BoolVar, but accepts a shorthand letter that can be used after a single dash.
  func BoolVarP(p *bool, name, shorthand string, value bool, usage string) {
  	flag := CommandLine.VarPF(newBoolValue(value, p), name, shorthand, usage)
  	flag.NoOptDefVal = "true"
  }
  
  // Bool defines a bool flag with specified name, default value, and usage string.
  // The return value is the address of a bool variable that stores the value of the flag.
  func (f *FlagSet) Bool(name string, value bool, usage string) *bool {
  	return f.BoolP(name, "", value, usage)
  }
  
  // BoolP is like Bool, but accepts a shorthand letter that can be used after a single dash.
  func (f *FlagSet) BoolP(name, shorthand string, value bool, usage string) *bool {
  	p := new(bool)
  	f.BoolVarP(p, name, shorthand, value, usage)
  	return p
  }
  
  // Bool defines a bool flag with specified name, default value, and usage string.
  // The return value is the address of a bool variable that stores the value of the flag.
  func Bool(name string, value bool, usage string) *bool {
  	return BoolP(name, "", value, usage)
  }
  
  // BoolP is like Bool, but accepts a shorthand letter that can be used after a single dash.
  func BoolP(name, shorthand string, value bool, usage string) *bool {
  	b := CommandLine.BoolP(name, shorthand, value, usage)
  	return b
  }
  