You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.go
    path of file: ./repos/milvus/cmd/tools/config
    
    the code of the file until where you have to start completion: package main

import (
	"fmt"
	"os"

	"github.com/milvus-io/milvus/pkg/log"
)

const (
	generateCsv  = "gen-csv"
	generateYaml = "gen-yaml"
	showYaml     = "show-yaml"
)

func main() {
	args := os.Args

	if len(args)
    
func main() {
	args := os.Args

	if len(args) < 2 {
		log.Error("len of args should large than 2")
		os.Exit(-1)
	}
	switch args[1] {
	case generateCsv:
		WriteCsv()
	case generateYaml:
		WriteYaml()
	case showYaml:
		var f string
		if len(args) == 2 {
			f = "configs/milvus.yaml"
		} else {
			f = args[2]
		}
		ShowYaml(f)
	default:
		log.Error(fmt.Sprintf("unknown argument %s", args[1]))
	}
}