main.go

func main() {
	config, err := getArgs()
	if err != nil {
		fmt.Println(err)
		fmt.Println(showHelp())
		os.Exit(1)
	}

	var (
		getEndpoint  = fmt.Sprintf("%s/oldusers/%s", config.endpoint, config.username)
		postEndpoint = fmt.Sprintf("%s/newusers/%s", config.endpoint, config.username)
		get          = either.WrapEither(http.Get)
	)

	result := get(getEndpoint).
		Next(getResponseBody).
		Next(ioutil.ReadAll).
		Next(user.NewFromJSON).
		Next(user.NewUserFromUser).
		Next(json.Marshal).
		Next(bytes.NewBuffer).
		Next(func(b *bytes.Buffer) (*http.Response, error) {
			return http.Post(postEndpoint, "application/json", b)
		})

	fmt.Println(result)
}