text: package pflag
  
  // -- string Value
  type stringValue string
  
  func newStringValue(val string, p *string) *stringValue {
  	*p = val
  	return (*stringValue)(p)
  }
  
  func (s *stringValue) Set(val string) error {
  	*s = stringValue(val)
  	return nil
  }
  func (s *stringValue) Type() string {
  	return "string"
  }
  
  func (s *stringValue) String() string { return string(*s) }
  
  func stringConv(sval string) (interface{}, error) {
  	return sval, nil
  }
  
  // GetString return the string value of a flag with the given name
  func (f *FlagSet) GetString(name string) (string, error) {
  	val, err := f.getFlagType(name, "string", stringConv)
  	if err != nil {
  		return "", err
  	}
  	return val.(string), nil
  }
  
  // StringVar defines a string flag with specified name, default value, and usage string.
  // The argument p points to a string variable in which to store the value of the flag.
  func (f *FlagSet) StringVar(p *string, name string, value string, usage string) {
  	f.VarP(newStringValue(value, p), name, "", usage)
  }
  
  // StringVarP is like StringVar, but accepts a shorthand letter that can be used after a single dash.
  func (f *FlagSet) StringVarP(p *string, name, shorthand string, value string, usage string) {
  	f.VarP(newStringValue(value, p), name, shorthand, usage)
  }
  
  // StringVar defines a string flag with specified name, default value, and usage string.
  // The argument p points to a string variable in which to store the value of the flag.
  func StringVar(p *string, name string, value string, usage string) {
  	CommandLine.VarP(newStringValue(value, p), name, "", usage)
  }
  
  // StringVarP is like StringVar, but accepts a shorthand letter that can be used after a single dash.
  func StringVarP(p *string, name, shorthand string, value string, usage string) {
  	CommandLine.VarP(newStringValue(value, p), name, shorthand, usage)
  }
  
  // String defines a string flag with specified name, default value, and usage string.
  // The return value is the address of a string variable that stores the value of the flag.
  func (f *FlagSet) String(name string, value string, usage string) *string {
  	p := new(string)
  	f.StringVarP(p, name, "", value, usage)
  	return p
  }
  
  // StringP is like String, but accepts a shorthand letter that can be used after a single dash.
  func (f *FlagSet) StringP(name, shorthand string, value string, usage string) *string {
  	p := new(string)
  	f.StringVarP(p, name, shorthand, value, usage)
  	return p
  }
  
  // String defines a string flag with specified name, default value, and usage string.
  // The return value is the address of a string variable that stores the value of the flag.
  func String(name string, value string, usage string) *string {
  	return CommandLine.StringP(name, "", value, usage)
  }
  
  // StringP is like String, but accepts a shorthand letter that can be used after a single dash.
  func StringP(name, shorthand string, value string, usage string) *string {
  	return CommandLine.StringP(name, shorthand, value, usage)
  }
  