package main

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

func main() {
	port := flag.Int("port", 8080, "服务监听端口")
	config := flag.String("config", "./config.yaml", "配置文件路径")

	// 重写全局帮助信息
	flag.Usage = func() {
		_, err := fmt.Fprintf(flag.CommandLine.Output(), "=== 服务启动工具 V1.0 ===\n\n")
		if err != nil {
			return
		}
		_, err = fmt.Fprintf(flag.CommandLine.Output(), "用法：%s [可选参数]\n\n", os.Args[0])
		if err != nil {
			return
		}
		_, err = fmt.Fprintf(flag.CommandLine.Output(), "参数说明：\n")
		if err != nil {
			return
		}
		flag.PrintDefaults()
		_, err = fmt.Fprintf(flag.CommandLine.Output(), "\n使用示例：\n")
		if err != nil {
			return
		}
		_, err = fmt.Fprintf(flag.CommandLine.Output(), "  %s -port=8080 -config=app.yaml\n", os.Args[0])
		if err != nil {
			return
		}
	}

	flag.Parse()

	fmt.Printf("服务启动成功，端口：%d，配置文件：%s\n", *port, *config)
}