package main

import (
	"flag"
	"fmt"
	"github.com/robfig/cron"
	"log"
	"os"
	"os/exec"
)

func main() {
	time_f := flag.String("time", "1m", "Set the time interval.")
	cmd_f := flag.String("cmd", "", "Execute the command.")
	vars_f := flag.String("vars", "", "Command line options for the programm.")

	flag.Parse()
	var (
		time, cmd, vars string
	)

	time = fmt.Sprintf("@every %s", *time_f)
	cmd = fmt.Sprintf("%s", *cmd_f)
	vars = fmt.Sprintf("%s", *vars_f)

	cmd, err := exec.LookPath(cmd)
	if err != nil {
		log.Printf("Executable (%s) neither found in PATH variable nor in working directory.\n", *cmd_f)
		os.Exit(1)
	}

	job := cron.New()
	job.AddFunc(time, func() {

		if vars == "" {
			c := exec.Command(cmd)
			o, err := c.Output()
			if err != nil {
				log.Println(err)
			}
			fmt.Printf("%s", o)
		} else {
			c := exec.Command("bash", "-c", cmd+" "+vars)
			o, err := c.Output()
			if err != nil {
				log.Println(err)
			}
			fmt.Printf("%s", o)
		}

	})
	job.Start()

	for {
		select {}
	}
}