1package pflag 2 3import "fmt" 4 5// -- string Value 6type stringValue string 7 8func newStringValue(val string, p *string) *stringValue { 9 *p = val 10 return (*stringValue)(p) 11} 12 13func (s *stringValue) Set(val string) error { 14 *s = stringValue(val) 15 return nil 16} 17func (s *stringValue) Type() string { 18 return "string" 19} 20 21func (s *stringValue) String() string { return fmt.Sprintf("%s", *s) } 22 23func stringConv(sval string) (interface{}, error) { 24 return sval, nil 25} 26 27// GetString return the string value of a flag with the given name 28func (f *FlagSet) GetString(name string) (string, error) { 29 val, err := f.getFlagType(name, "string", stringConv) 30 if err != nil { 31 return "", err 32 } 33 return val.(string), nil 34} 35 36// StringVar defines a string flag with specified name, default value, and usage string. 37// The argument p points to a string variable in which to store the value of the flag. 38func (f *FlagSet) StringVar(p *string, name string, value string, usage string) { 39 f.VarP(newStringValue(value, p), name, "", usage) 40} 41 42// StringVarP is like StringVar, but accepts a shorthand letter that can be used after a single dash. 43func (f *FlagSet) StringVarP(p *string, name, shorthand string, value string, usage string) { 44 f.VarP(newStringValue(value, p), name, shorthand, usage) 45} 46 47// StringVar defines a string flag with specified name, default value, and usage string. 48// The argument p points to a string variable in which to store the value of the flag. 49func StringVar(p *string, name string, value string, usage string) { 50 CommandLine.VarP(newStringValue(value, p), name, "", usage) 51} 52 53// StringVarP is like StringVar, but accepts a shorthand letter that can be used after a single dash. 54func StringVarP(p *string, name, shorthand string, value string, usage string) { 55 CommandLine.VarP(newStringValue(value, p), name, shorthand, usage) 56} 57 58// String defines a string flag with specified name, default value, and usage string. 59// The return value is the address of a string variable that stores the value of the flag. 60func (f *FlagSet) String(name string, value string, usage string) *string { 61 p := new(string) 62 f.StringVarP(p, name, "", value, usage) 63 return p 64} 65 66// StringP is like String, but accepts a shorthand letter that can be used after a single dash. 67func (f *FlagSet) StringP(name, shorthand string, value string, usage string) *string { 68 p := new(string) 69 f.StringVarP(p, name, shorthand, value, usage) 70 return p 71} 72 73// String defines a string flag with specified name, default value, and usage string. 74// The return value is the address of a string variable that stores the value of the flag. 75func String(name string, value string, usage string) *string { 76 return CommandLine.StringP(name, "", value, usage) 77} 78 79// StringP is like String, but accepts a shorthand letter that can be used after a single dash. 80func StringP(name, shorthand string, value string, usage string) *string { 81 return CommandLine.StringP(name, shorthand, value, usage) 82} 83