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bool.go (3072B)

      1 package pflag
      2 
      3 import "strconv"
      4 
      5 // optional interface to indicate boolean flags that can be
      6 // supplied without "=value" text
      7 type boolFlag interface {
      8 	Value
      9 	IsBoolFlag() bool
     10 }
     11 
     12 // -- bool Value
     13 type boolValue bool
     14 
     15 func newBoolValue(val bool, p *bool) *boolValue {
     16 	*p = val
     17 	return (*boolValue)(p)
     18 }
     19 
     20 func (b *boolValue) Set(s string) error {
     21 	v, err := strconv.ParseBool(s)
     22 	*b = boolValue(v)
     23 	return err
     24 }
     25 
     26 func (b *boolValue) Type() string {
     27 	return "bool"
     28 }
     29 
     30 func (b *boolValue) String() string { return strconv.FormatBool(bool(*b)) }
     31 
     32 func (b *boolValue) IsBoolFlag() bool { return true }
     33 
     34 func boolConv(sval string) (interface{}, error) {
     35 	return strconv.ParseBool(sval)
     36 }
     37 
     38 // GetBool return the bool value of a flag with the given name
     39 func (f *FlagSet) GetBool(name string) (bool, error) {
     40 	val, err := f.getFlagType(name, "bool", boolConv)
     41 	if err != nil {
     42 		return false, err
     43 	}
     44 	return val.(bool), nil
     45 }
     46 
     47 // BoolVar defines a bool flag with specified name, default value, and usage string.
     48 // The argument p points to a bool variable in which to store the value of the flag.
     49 func (f *FlagSet) BoolVar(p *bool, name string, value bool, usage string) {
     50 	f.BoolVarP(p, name, "", value, usage)
     51 }
     52 
     53 // BoolVarP is like BoolVar, but accepts a shorthand letter that can be used after a single dash.
     54 func (f *FlagSet) BoolVarP(p *bool, name, shorthand string, value bool, usage string) {
     55 	flag := f.VarPF(newBoolValue(value, p), name, shorthand, usage)
     56 	flag.NoOptDefVal = "true"
     57 }
     58 
     59 // BoolVar defines a bool flag with specified name, default value, and usage string.
     60 // The argument p points to a bool variable in which to store the value of the flag.
     61 func BoolVar(p *bool, name string, value bool, usage string) {
     62 	BoolVarP(p, name, "", value, usage)
     63 }
     64 
     65 // BoolVarP is like BoolVar, but accepts a shorthand letter that can be used after a single dash.
     66 func BoolVarP(p *bool, name, shorthand string, value bool, usage string) {
     67 	flag := CommandLine.VarPF(newBoolValue(value, p), name, shorthand, usage)
     68 	flag.NoOptDefVal = "true"
     69 }
     70 
     71 // Bool defines a bool flag with specified name, default value, and usage string.
     72 // The return value is the address of a bool variable that stores the value of the flag.
     73 func (f *FlagSet) Bool(name string, value bool, usage string) *bool {
     74 	return f.BoolP(name, "", value, usage)
     75 }
     76 
     77 // BoolP is like Bool, but accepts a shorthand letter that can be used after a single dash.
     78 func (f *FlagSet) BoolP(name, shorthand string, value bool, usage string) *bool {
     79 	p := new(bool)
     80 	f.BoolVarP(p, name, shorthand, value, usage)
     81 	return p
     82 }
     83 
     84 // Bool defines a bool flag with specified name, default value, and usage string.
     85 // The return value is the address of a bool variable that stores the value of the flag.
     86 func Bool(name string, value bool, usage string) *bool {
     87 	return BoolP(name, "", value, usage)
     88 }
     89 
     90 // BoolP is like Bool, but accepts a shorthand letter that can be used after a single dash.
     91 func BoolP(name, shorthand string, value bool, usage string) *bool {
     92 	b := CommandLine.BoolP(name, shorthand, value, usage)
     93 	return b
     94 }