go命令行工具制作模板

一个快速制作go工具的模板, 可接收外部入参的

package main

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

const OSEXIT2 = 2

var (
	help1 *bool
	help2 *bool
	para1 *string
	para2 *string
)

type config struct {
	para1 string
	para2 string
}

func init() {
	help1 = flag.Bool("h", false, "help")
	help2 = flag.Bool("help", false, "help")
	para1 = flag.String("para1", "", " use para1")
	para2 = flag.String("para2", "", " use para2")
}

func usage() {
	fmt.Fprintf(os.Stderr, "usage of tool\n")
	flag.PrintDefaults()
	os.Exit(OSEXIT2)
}

func parse() *config {
	flag.Usage = usage
	flag.Parse()
	cfg := &config{}
	cfg.para1 = *para1
	cfg.para2 = *para2
	if *help1 || *help2 {
		flag.Usage()
	}
	return cfg
}

func main() {
	log.SetPrefix("[run tool]")
	cfg := parse()
	log.Printf("para1: %v, para2: %v\n", cfg.para1, cfg.para2)
}

用go build可制作出可执行文件
用结构体config承载入参
参数输入-h或者-help可打印出用法