const exec = require('child_process').exec,
    D = console.log;

    function runShellCommand(command) {
        return new Promise((resolve,reject) => {
            let outmessage,
                errormessage

            let runner = exec(command, function (err, stdout, stderr) {
                if (err) {
                    //D(`stderr : ${stderr}`)
                    //D(`out : ${stdout}`)
                    //D(`err : ${err}`)
                    reject(stderr)
                }

                outmessage=stdout
                errormessage=stderr

            })
            runner.on('close', function(exitcode) {
                resolve({outmessage,exitcode})
            })

        })
    }


function chainPromises(){

runShellCommand("df -h")
  .then(res1 =>  runShellCommand(`echo "${res1.outmessage}" > command1.log`))
  .then(res2 =>  runShellCommand(`echo exit code "${res2.exitcode}" > command2.log`))

}

 function unsyncResult(){

let res1 =  runShellCommand("df -h")
let res2 =  runShellCommand(`echo "${res1.outmessage}" > command1.log`)
let res3 =  runShellCommand(`echo exit code "${res2.exitcode}" > command2.log`)

}


async function asyncMode(){
let res1 = await runShellCommand("df -h")
let res2 = await runShellCommand(`echo "${res1.outmessage}" > command1.log`)
let res3 = await runShellCommand(`echo exit code "${res2.exitcode}" > command2.log`)
}

async function asyncCatch(){

  runShellCommand("df -h")
    .then(res1 =>  runShellCommand(`echio "${res1.outmessage}" > command1.log`))
    .catch(e => {throw e})
    .then(res2 =>  runShellCommand(`echioo exit code "${res2.exitcode}" > command2.log`))
    //.catch(e => console.log(e))

}


function promiseList(){

  var promise1 = Promise.resolve(3);
  var promise2 = 42;
  var promise3 = new Promise(function(resolve, reject) {
    setTimeout(resolve, 3000, 'foo');
  });

  Promise.all([promise3, promise2, promise1]).then(function(values) {
    console.log(values);

    //HAGO mis cosas
  });

}


//unsyncResult()
//console.log(asyncMode())
//chainPromises()
//asyncCatch()
console.log(promiseList())
console.log("ddd")
//calbacks()