进一步有进一步惊喜

package main

import (
	"encoding/json"
	"io/ioutil"
	"log"
	"math/rand"
	"os/exec"
	"time"
)
type Config struct {
	List []string
	Interval int
}
var config = Config{}
func randomPaper(args []string) {
	index := rand.Int31n(int32(len(config.List)))
	args[3] = config.List[index]
}
func init() {
	data,err := ioutil.ReadFile("config.json")
	if err != nil {
		log.Fatal("read config file err:",err)
	}
	err = json.Unmarshal(data,&config)
	if err != nil{
		log.Fatal("unmarshal err:",err)
	}
	if len(config.List) <= 0 {
		log.Fatal("list no exist")
	}
	if config.Interval < 3 {
		log.Fatal("interval is too fast")
	}
}
func main() {
	args := []string{
		"set","org.gnome.desktop.background","picture-uri","",
	}
	for {
		randomPaper(args)
		cmd := exec.Command("gsettings",args...)
		cmd.Run()
		i := time.Second * (time.Duration(config.Interval))
		time.Sleep(i)
	}
}