// getFlags returns the flags with the given names. Only flags that are set and
// whose name is included in flagNames are included.
func getFlags(flagSet *gnuflag.FlagSet, flagNames []string) []string {
flags := make([]string, 0, flagSet.NFlag())
flagSet.Visit(func(flag *gnuflag.Flag) {
for _, name := range flagNames {
if flag.Name == name {
flags = append(flags, flagWithMinus(name))
}
}
})
return flags
}