// ParseFlags is a utility function that adds a help flag if withHelp is true,
// calls cmd.Parse(args) and prints a relevant error message if there are
// incorrect number of arguments. It returns error only if error handling is
// set to ContinueOnError and parsing fails. If error handling is set to
// ExitOnError, it's safe to ignore the return value.
// TODO: move this to a better package than utils
func ParseFlags(cmd *flag.FlagSet, args []string, withHelp bool) error {
var help *bool
if withHelp {
help = cmd.Bool([]string{"#help", "-help"}, false, "Print usage")
}
if err := cmd.Parse(args); err != nil {
return err
}
if help != nil && *help {
cmd.Usage()
// just in case Usage does not exit
os.Exit(0)
}
if str := cmd.CheckArgs(); str != "" {
ReportError(cmd, str, withHelp)
}
return nil
}