FlagSetのサンプル

main.go

package main

import (
	"errors"
	"flag"
	"fmt"
	"os"
)

var (
	h1       string
	h2       string
	flagSet  *flag.FlagSet
	flagSet2 *flag.FlagSet
)

func init() {
	flagSet = flag.NewFlagSet("hoge1", flag.ExitOnError)
	flagSet.StringVar(&h1, "foo", "", "sample hoge")
	flagSet2 = flag.NewFlagSet("hoge2", flag.ExitOnError)
	flagSet2.StringVar(&h2, "foo", "", "sample hoge")
}

func main() {
	subCommand := os.Args[1]
	if err := parseFlagSet(subCommand); err != nil {
		fmt.Println(err)
		os.Exit(2)
	}
	if h1 != "" {
		fmt.Printf("hoge1 %s\n", h1)
	}
	if h2 != "" {
		fmt.Printf("hoge2 %s\n", h2)
	}
}

func parseFlagSet(subCommand string) error {
	switch subCommand {
	case "hoge1":
		return flagSet.Parse(os.Args[2:])
	case "hoge2":
		return flagSet2.Parse(os.Args[2:])
	default:
		return errors.New("error parse FlagSet")
	}
}