func manPrintFlags(out *bytes.Buffer, flags *pflag.FlagSet) {
flags.VisitAll(func(flag *pflag.Flag) {
if len(flag.Deprecated) > 0 || flag.Hidden {
return
}
format := ""
if len(flag.Shorthand) > 0 {
format = "**-%s**, **--%s**"
} else {
format = "%s**--%s**"
}
if len(flag.NoOptDefVal) > 0 {
format = format + "["
}
if flag.Value.Type() == "string" {
// put quotes on the value
format = format + "=%q"
} else {
format = format + "=%s"
}
if len(flag.NoOptDefVal) > 0 {
format = format + "]"
}
format = format + "\n\t%s\n\n"
fmt.Fprintf(out, format, flag.Shorthand, flag.Name, flag.DefValue, flag.Usage)
})
}
// Test if the named flag is a boolean flag.
func isBooleanFlag(name string, f *flag.FlagSet) bool {
flag := f.Lookup(name)
if flag == nil {
return false
}
return flag.Value.Type() == "bool"
}
// Test if the named flag is a boolean flag.
func isBooleanShortFlag(name string, f *flag.FlagSet) bool {
result := false
f.VisitAll(func(f *flag.Flag) {
if f.Shorthand == name && f.Value.Type() == "bool" {
result = true
}
})
return result
}
// BindBoolFlag binds the flag based on the provided info. If LongName == "", nothing is registered
func (f FlagInfo) BindBoolFlag(flags *pflag.FlagSet, target *bool) {
// you can't register a flag without a long name
if len(f.LongName) > 0 {
// try to parse Default as a bool. If it fails, assume false
boolVal, err := strconv.ParseBool(f.Default)
if err != nil {
boolVal = false
}
flags.BoolVarP(target, f.LongName, f.ShortName, boolVal, f.Description)
}
}
// MarkFlagFilename adds the BashCompFilenameExt annotation to the named flag in the flag set, if it exists.
// Generated bash autocompletion will select filenames for the flag, limiting to named extensions if provided.
func MarkFlagFilename(flags *pflag.FlagSet, name string, extensions ...string) error {
return flags.SetAnnotation(name, BashCompFilenameExt, extensions)
}
// MarkFlagRequired adds the BashCompOneRequiredFlag annotation to the named flag in the flag set, if it exists.
func MarkFlagRequired(flags *pflag.FlagSet, name string) error {
return flags.SetAnnotation(name, BashCompOneRequiredFlag, []string{"true"})
}
// BindStringFlag binds the flag based on the provided info. If LongName == "", nothing is registered
func (f FlagInfo) BindStringFlag(flags *pflag.FlagSet, target *string) {
// you can't register a flag without a long name
if len(f.LongName) > 0 {
flags.StringVarP(target, f.LongName, f.ShortName, f.Default, f.Description)
}
}