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: example.go
    path of file: ./repos/iam/pkg/log/example
    
    the code of the file until where you have to start completion: // Copyright 2020 Lingfei Kong <colin404@foxmail.com>. All rights reserved.
// Use of this source code is governed by a MIT style
// license that can be found in the LICENSE file.

package main

import (
	"context"
	"flag"

	"github.com/marmotedu/iam/pkg/log"
)

var (
	h bool

	level  in
    
func main() {
	flag.BoolVar(&h, "h", false, "Print this help.")
	flag.IntVar(&level, "l", 0, "Log level.")
	flag.StringVar(&format, "f", "console", "log output format.")

	flag.Parse()

	if h {
		flag.Usage()

		return
	}

	// logger配置
	opts := &log.Options{
		Level:            "debug",
		Format:           "console",
		EnableColor:      true, // if you need output to local path, with EnableColor must be false.
		DisableCaller:    true,
		OutputPaths:      []string{"test.log", "stdout"},
		ErrorOutputPaths: []string{"error.log"},
	}
	// 初始化全局logger
	log.Init(opts)
	defer log.Flush()

	// Debug、Info(with field)、Warnf、Errorw使用
	log.Debug("This is a debug message")
	log.Info("This is a info message", log.Int32("int_key", 10))
	log.Warnf("This is a formatted %s message", "warn")
	log.Errorw("Message printed with Errorw", "X-Request-ID", "fbf54504-64da-4088-9b86-67824a7fb508")

	// WithValues使用
	lv := log.WithValues("X-Request-ID", "7a7b9f24-4cae-4b2a-9464-69088b45b904")
	lv.Infow("Info message printed with [WithValues] logger")
	lv.Infow("Debug message printed with [WithValues] logger")

	// Context使用
	ctx := lv.WithContext(context.Background())
	lc := log.FromContext(ctx)
	lc.Info("Message printed with [WithContext] logger")

	ln := lv.WithName("test")
	ln.Info("Message printed with [WithName] logger")

	// V level使用
	log.V(log.InfoLevel).Info("This is a V level message")
	log.V(log.ErrorLevel).
		Infow("This is a V level message with fields", "X-Request-ID", "7a7b9f24-4cae-4b2a-9464-69088b45b904")
}