使用go实现一个简单的命令行

实现一个简单的命令行

• 使用go实现一个简单的命令行，可以使用第三方库""github.com/urfave/cli""
• 调用系统命令可以使用go自带的库exec.Command

示例1

package main

import (
    "github.com/urfave/cli"
    "fmt"
    "os"
    "github.com/gpmgo/gopm/modules/log"
    "os/exec"
)

func main(){
    app := cli.NewApp()
    app.Name = "cmd"
    app.Usage = "cmd ls"
    app.Action = func(context *cli.Context)error{
        cmd := exec.Command(context.Args().Get(0))
        rst,err :=cmd.Output()
        if err != nil {
            log.Fatal("err %s",err)
        }
        fmt.Printf(string(rst))
    }

    err := app.Run(os.Args)
    if err != nil {
        log.Info("err:%s\n",err)
    }
}

示例2

package main

import (
    "github.com/urfave/cli"
    "fmt"
    "os"
    "os/exec"
)


func Run(command string) *exec.Cmd {
    cmd := exec.Command(command)
    rst,err :=cmd.Output()
    if err != nil {
        fmt.Printf("err: %s",err)
    }

    fmt.Printf("rst=%s\n",rst)
    return cmd
}

var runCommand=cli.Command{
    Name:"run",
    Usage: `create a container mydocker run -ti`,
    Action: func(context *cli.Context) error{
        cmd := context.Args().Get(0)
        Run(cmd)
        return nil
    },
}


func main() {
    app :=cli.NewApp()
    app.Name = "mydocker"
    app.Usage = "mydocker study. mydocker is a simple container runtime implementation"
    app.Commands = []cli.Command{
        runCommand,
    }
    fmt.Printf("main func os.Args=%s",os.Args)
    app.Run(os.Args)
}