今天需要用golang写一个简单的命令行小工具，虽然标准库的flag包也能实现，但是实现起来有些麻烦，而且对多级子命令更不支持，于是在网上找了这几个spf13､cobra和urfave/cli等，我反正不需要太复杂的，对比了下感觉cli这个库看上去要相对简单一些，于是就用这个库开发了。
git库地址：
它有v1和v2版本，我用的是v2,文档地址是
直接安装
go get github.com/urfave/cli/v2
代码实例
我要评论package main
import (
"fmt"
"log"
"os"
"sort"
"github.com/urfave/cli/v2"
)
func main() {
app := &cli.app{
name:"zc-web-deploy",
usage:"项目打包平台",
description:"项目打包平台,将打好的包上传至存储中心上面，运维人员作发布",
commands: []*cli.command{
{
name: "project",
aliases: []string{"p"},
usage: "deploy project",
subcommands:[]*cli.command{
{
name: "init",
aliases: []string{"i"},
usage: "init the project",
action: func(c *cli.context) error {
project.initproject()
return nil
},
},
{
name: "build",
aliases: []string{"b"},
usage: "build the project as tar to ftp",
action: func(c *cli.context) error {
var (
deployproject *common.deployproject
)
deployproject = &common.deployproject{
domain:c.string("domain"),
tag:c.string("tag"),
}
if deployproject.domain == "" || deployproject.tag == "" {
fmt.println("构建的项目域名或tag不能为空")
return nil
}
project.deploy(deployproject)
return nil
},
flags: []cli.flag{
&cli.stringflag{
name: "domain, d",
value: "xxxx",
usage: "指定工程的域名",
required:true,
},
&cli.stringflag{
name: "tag, t",
value: "release-tag",
usage: "打包项目的git的tag发布版本号",
required:true,
},
},
},
{
name: "list",
aliases: []string{"ls"},
usage: "list the project",
action: func(c *cli.context) error {
var (
projectlist []string
p string
)
projectlist = project.listproject()
if len(projectlist) > 0 {
for _, p = range projectlist {
fmt.println(p)
}
} else {
fmt.println("暂无项目，可以初始化建立project init")
}
return nil
},
},
},
action: func(c *cli.context) error {
fmt.println("请指定具体操作: init、ls、build或用 -h 查看命令")
return nil
},
},
},
}
sort.sort(cli.flagsbyname(app.flags))
sort.sort(cli.commandsbyname(app.commands))
err := app.run(os.args)
if err != nil {
log.fatal(err)
}
}
输入下面的命令，看到project支持的子命令都看到了
$ go run main.go project -h name: zc-web-deploy project - deploy project usage: zc-web-deploy project command [command options] [arguments...] commands: init, i init the project build, b build the project as tar to ftp list, ls list the project help, h shows a list of commands or help for one command options: --help, -h show help (default: false)
子命令输出
$ go run main.go project ls xxx.com
总体来说，cli的使用还是不难的，填充 cli.app结构体自已需要的字段就行了，然后在action执行自已的业务逻辑。
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