Lights up an led when there's unread mail

inbox.js

/* usage: node inbox.js -u username@server.com -p hunter2 */

var Q = require('q');
var minimist = require('minimist');
var inbox = require('inbox');
var Five = require("johnny-five");


function handleError(err){
  console.error(err);
}


var argv = minimist(process.argv.slice(2));
var imapUser = argv.u;
var imapPass = argv.p;

if(!imapUser) throw new Error('No user specified (-u option)');
if(!imapPass) throw new Error('No password specified (-p option)');


var imapClient = inbox.createConnection(false, 'imap.gmail.com', {
  secureConnection: true,
  auth: { user: imapUser, pass: imapPass }
});


var whenImapConnected = Q.Promise(function resolver(resolve){
  imapClient.connect();
  imapClient.on('connect', function(){
    imapClient.openMailbox('INBOX', function(err, info){
      if(err) throw err;
      resolve(imapClient);
    });
  });
});


var board = new Five.Board();
var whenHardwareReady = Q.Promise(function resolver(resolve){
  board.on('ready', function(){
    var hardware = {
      statusLed: new Five.Led(6)
    };
    resolve(hardware);
  });
});


function checkForUnreadMail(interval, callback){
  console.info(new Date() + ': Checking for unread messages...');
  imapClient.search({ unseen: true }, function(err, data){
    if(err) throw err;
    console.info(new Date() + ': ' + data.length + ' unread messages found');
    var unreadMail = (data.length > 0);
    callback(unreadMail);
    setTimeout(checkForUnreadMail.bind(null, interval, callback), interval);
  });
}


Q.all([ whenImapConnected, whenHardwareReady ])
  .spread(function(client, hardware){
    checkForUnreadMail(20000, function(unreadMail){
      if(unreadMail && hardware.statusLed.isOn === false){
        hardware.statusLed.on();
      }
      else if(!unreadMail && hardware.statusLed.isOn === true){
        hardware.statusLed.off();
      }
    });
  })
  .fail(handleError);