}

// ExtraUsage implements the plugin.FlagSet interface.
func (f *GoFlags) ExtraUsage() string {
	return strings.Join(f.UsageMsgs, "\n")
}

// AddExtraUsage implements the plugin.FlagSet interface.
func (f *GoFlags) AddExtraUsage(eu string) {
	f.UsageMsgs = append(f.UsageMsgs, eu)
}

// Parse implements the plugin.FlagSet interface.
func (*GoFlags) Parse(usage func()) []string {
	flag.Usage = usage

	// standard usage message. The extra usage message returned includes all text
	// added with AddExtraUsage().
	// The typical use of ExtraUsage is to show any custom flags defined by the
	// specific pprof plugins being used.
	ExtraUsage() string

	// AddExtraUsage appends additional text to the end of the extra usage message.
	AddExtraUsage(eu string)

	// Parse initializes the flags with their values for this run

	// standard usage message. The extra usage message returned includes all text
	// added with AddExtraUsage().
	// The typical use of ExtraUsage is to show any custom flags defined by the
	// specific pprof plugins being used.
	ExtraUsage() string

	// AddExtraUsage appends additional text to the end of the extra usage message.
	AddExtraUsage(eu string)

	// Parse initializes the flags with their values for this run

// the flagset is nil, no flags will be added, and users will not be able to
// use these flags.
func New(flagset plugin.FlagSet) http.RoundTripper {
	if flagset == nil {
		return &transport{}
	}
	flagset.AddExtraUsage(extraUsage)
	return &transport{
		cert: flagset.String("tls_cert", "", "TLS client certificate file for fetching profile and symbols"),