Golang FlagSet.Var方法代碼示例

// Apply populates the flag given the flag set and environment
func (f IntSliceFlag) Apply(set *flag.FlagSet) {
	if f.EnvVars != nil {
		for _, envVar := range f.EnvVars {
			if envVal := os.Getenv(envVar); envVal != "" {
				newVal := NewIntSlice()
				for _, s := range strings.Split(envVal, ",") {
					s = strings.TrimSpace(s)
					err := newVal.Set(s)
					if err != nil {
						fmt.Fprintf(ErrWriter, err.Error())
					}
				}
				f.Value = newVal
				break
			}
		}
	}

	if f.Value == nil {
		f.Value = NewIntSlice()
	}

	for _, name := range f.Names() {
		set.Var(f.Value, name, f.Usage)
	}
}

func (a *app) parseArgs(fs *flag.FlagSet, args []string) error {
	fs.SetOutput(a.out)
	fs.Usage = func() {
		fmt.Fprintf(a.out, help, args[0], args[0])
		fs.PrintDefaults()
	}

	fs.Var(&a.typeNames, "type",
		"A generated proto.Message type to generate stubs for (required, repeatable)")
	fs.StringVar(&a.outFile, "out", "proto_gae.gen.go",
		"The name of the output file")
	fs.StringVar(&a.header, "header", copyright, "Header text to put at the top of "+
		"the generated file. Defaults to the Chromium Authors copyright.")

	if err := fs.Parse(args[1:]); err != nil {
		return err
	}
	fail := errors.MultiError(nil)
	if a.typeNames.Data == nil || a.typeNames.Data.Len() == 0 {
		fail = append(fail, errors.New("must specify one or more -type"))
	}
	if !strings.HasSuffix(a.outFile, ".go") {
		fail = append(fail, errors.New("-output must end with '.go'"))
	}
	if len(fail) > 0 {
		for _, e := range fail {
			fmt.Fprintln(a.out, "error:", e)
		}
		fmt.Fprintln(a.out)
		fs.Usage()
		return fail
	}
	return nil
}

func (cmd *mark) Register(ctx context.Context, f *flag.FlagSet) {
	cmd.HostSystemFlag, ctx = flags.NewHostSystemFlag(ctx)
	cmd.HostSystemFlag.Register(ctx, f)

	f.Var(flags.NewOptionalBool(&cmd.ssd), "ssd", "Mark as SSD")
	f.Var(flags.NewOptionalBool(&cmd.local), "local", "Mark as local")
}

func (cmd *create) Register(ctx context.Context, f *flag.FlagSet) {
	cmd.HostSystemFlag, ctx = flags.NewHostSystemFlag(ctx)
	cmd.HostSystemFlag.Register(ctx, f)

	modes := []string{
		string(types.HostMountModeReadOnly),
		string(types.HostMountModeReadWrite),
	}

	f.StringVar(&cmd.Name, "name", "", "Datastore name")
	f.Var(&cmd.Type, "type", fmt.Sprintf("Datastore type (%s)", strings.Join(allTypes, "|")))
	f.BoolVar(&cmd.Force, "force", false, "Ignore DuplicateName error if datastore is already mounted on a host")

	// Options for NAS
	f.StringVar(&cmd.RemoteHost, "remote-host", "", "Remote hostname of the NAS datastore")
	f.StringVar(&cmd.RemotePath, "remote-path", "", "Remote path of the NFS mount point")
	f.StringVar(&cmd.AccessMode, "mode", modes[0],
		fmt.Sprintf("Access mode for the mount point (%s)", strings.Join(modes, "|")))
	f.StringVar(&cmd.UserName, "username", "", "Username to use when connecting (CIFS only)")
	f.StringVar(&cmd.Password, "password", "", "Password to use when connecting (CIFS only)")

	// Options for VMFS
	f.StringVar(&cmd.DiskCanonicalName, "disk", "", "Canonical name of disk (VMFS only)")

	// Options for Local
	f.StringVar(&cmd.Path, "path", "", "Local directory path for the datastore (local only)")
}

func (cmd *add) DefineFlags(fs *flag.FlagSet) {
	fs.BoolVar(&cmd.json, "json", false, "Output result as JSON")
	fs.StringVar(&cmd.uri, "uri", "", "Drain URI (eg: udp://logs.loggly.com:12345)")
	fs.Var(&cmd.filters, "filter", "Message filter")
	cmd.params = make(map[string]string)
	fs.Var(&cmd.params, "o", "Drain options (eg: -o 'limit=100' or -o 'format={{.Text}}'")
}

func (cmd *add) Register(ctx context.Context, f *flag.FlagSet) {
	cmd.HostSystemFlag, ctx = flags.NewHostSystemFlag(ctx)
	cmd.HostSystemFlag.Register(ctx, f)

	f.StringVar(&cmd.spec.VswitchName, "vswitch", "", "vSwitch Name")
	f.Var(flags.NewInt32(&cmd.spec.VlanId), "vlan", "VLAN ID")
}

func (cmd *change) Register(f *flag.FlagSet) {
	f.Int64Var(&cmd.MemoryMB, "m", 0, "Size in MB of memory")
	f.IntVar(&cmd.NumCPUs, "c", 0, "Number of CPUs")
	f.StringVar(&cmd.GuestId, "g", "", "Guest OS")
	f.StringVar(&cmd.Name, "name", "", "Display name")
	f.Var(&cmd.extraConfig, "e", "ExtraConfig. <key>=<value>")
}

func NewFlagOverwrite(
	set *flag.FlagSet,
	config *Config,
	name, path, def, usage string,
) *string {
	if config == nil {
		panic("Missing configuration")
	}
	if path == "" {
		panic("empty path")
	}

	if def != "" {
		err := config.SetString(path, -1, def)
		if err != nil {
			panic(err)
		}
	}

	f := &flagOverwrite{
		config: config.access(),
		path:   path,
		value:  def,
	}

	if set == nil {
		flag.Var(f, name, usage)
	} else {
		set.Var(f, name, usage)
	}

	return &f.value
}

// FlagByType sets the appropriate flag for its type.
func FlagByType(fs *flag.FlagSet, structName string, fval reflect.Value, ftype reflect.StructField) {
	// Get a pointer; FlagSet needs a pointer to set the struct's field
	if fval.Kind() == reflect.Ptr {
		// Short-circuit
		log.Printf("Skipping field %s: %s", ftype.Name, ftype.Type.String())
		return
	}
	//log.Printf("Getting pointer to %s", ftype.Name)
	fval = fval.Addr()
	flagName := NameToFlag(ftype.Name)
	flagHelp := fmt.Sprintf("%s:%s", structName, ftype.Name)
	log.Printf("Converting %s => %s", ftype.Name, flagName)

	//log.Printf("Switching on type %s...", ftype.Type.String())
	switch fval := fval.Interface().(type) {
	case *int:
		fs.IntVar(fval, flagName, 0, flagHelp)
	case *float64:
		fs.Float64Var(fval, flagName, 0.0, flagHelp)
	case *string:
		fs.StringVar(fval, flagName, "", flagHelp)
	case *bool:
		fs.BoolVar(fval, flagName, false, flagHelp)
	case *time.Time:
		t := (*time.Time)(fval) // Get a *time.Time pointer to fval
		*t = time.Now()         // Set a default of time.Now()
		fs.Var((*TimeFlag)(fval), flagName, flagHelp)
	default:
		log.Printf("unexpected type %s\n", ftype.Type.String())
	}
}

func (cmd *start) Register(ctx context.Context, f *flag.FlagSet) {
	cmd.GuestFlag, ctx = newGuestFlag(ctx)
	cmd.GuestFlag.Register(ctx, f)

	f.StringVar(&cmd.dir, "C", "", "The absolute path of the working directory for the program to start")
	f.Var(&cmd.vars, "e", "Set environment variable (key=val)")
}

func influxdbCommandLine(cli *flag.FlagSet) CommandLineHandler {
	ix := &influx{
		logger:      NewLogger("[ostent sendto-influxdb] "),
		RefreshFlag: flags.Period{Duration: 10 * time.Second}, // 10s default
		// ServerAddr: flags.NewBind(8086),
	}
	cli.Var(&ix.RefreshFlag, "influxdb-refresh", "InfluxDB refresh interval")
	cli.StringVar(&ix.ServerAddr, "sendto-influxdb", "", "InfluxDB server address")
	cli.StringVar(&ix.Database, "influxdb-database", "ostent", "InfluxDB database")
	cli.StringVar(&ix.Username, "influxdb-username", "", "InfluxDB username")
	cli.StringVar(&ix.Password, "influxdb-password", "", "InfluxDB password")
	return func() (AtexitHandler, bool, error) {
		if ix.ServerAddr == "" {
			return nil, false, nil
		}
		ostent.AddBackground(func(defaultPeriod flags.Period) {
			/* if ix.RefreshFlag.Duration == 0 { // if .RefreshFlag had no default
				ix.RefreshFlag = defaultPeriod
			} */
			go influxdb.Influxdb(ostent.Reg1s.Registry, ix.RefreshFlag.Duration, &influxdb.Config{
				Host:     ix.ServerAddr, //.String(),
				Database: ix.Database,
				Username: ix.Username,
				Password: ix.Password,
			})
		})
		return nil, false, nil
	}
}

func (s *ResourceConfigSpecFlag) Register(f *flag.FlagSet) {
	opts := []struct {
		name  string
		units string
		*types.ResourceAllocationInfo
	}{
		{"CPU", "MHz", &s.CpuAllocation},
		{"Memory", "MB", &s.MemoryAllocation},
	}

	for _, opt := range opts {
		prefix := strings.ToLower(opt.name)[:3]
		shares := (*sharesInfo)(opt.Shares)

		expandableReservation := false
		if v := opt.ExpandableReservation; v != nil {
			expandableReservation = *v
		}

		// Initialize bool pointer
		opt.ExpandableReservation = types.NewBool(false)

		f.Int64Var(&opt.Limit, prefix+".limit", 0, opt.name+" limit in "+opt.units)
		f.Int64Var(&opt.Reservation, prefix+".reservation", 0, opt.name+" reservation in "+opt.units)
		f.BoolVar(opt.ExpandableReservation, prefix+".expandable", expandableReservation, opt.name+" expandable reservation")
		f.Var(shares, prefix+".shares", opt.name+" shares level or number")
	}
}

func registerFlag(set *goflag.FlagSet, v goflag.Value, name, usage string) {
	if set != nil {
		set.Var(v, name, usage)
	} else {
		goflag.Var(v, name, usage)
	}
}

func flRun(fl *flag.FlagSet) {
	flPodManifest(fl)
	SaveIDFlag(fl)
	fl.Var(&flAppName, "app", "Specify app to run for a multi-app pod")
	fl.BoolVar(&flDestroy, "destroy", false, "Destroy pod when done")
	fl.BoolVar(&flTerminal, "t", false, "Attach app to the terminal (single-app containers only)")
}

// Flag configures the given FlagSet with the flags to configure
// all active experiments.
func Flag(fs *flag.FlagSet) {
	for _, id := range All {
		desc := id.Flag()
		key := fmt.Sprintf("X%s", id.Flag())
		fs.Var(&idValue{X: id}, key, desc)
	}
}