Chuck Norris Edison IoT Demo

gistfile1.js

var request = require('request');

var mraa = require('mraa');
var myButton = new mraa.Gpio(3);
myButton.dir(mraa.DIR_IN);

var LCD = require('jsupm_i2clcd');
var myLCD = new LCD.Jhd1313m1(0, 0x3E, 0x62);

var processingRequest = false;
function readButton()
{
    if (myButton.read() && !processingRequest)
    {
        processingRequest = true;
        showJoke();
    }
}
setInterval(readButton, 250);

var showJoke = function() { 
      request.get('http://api.icndb.com/jokes/random',     
          function (error, response, body) {
                if (!error && response.statusCode == 200) {

                    var joke = JSON.parse(body).value.joke;
                    outputLines(0, linifyJoke(joke, 16));
                }
          }
      )};
    
var i = 0;
var outputLines = function(i, lines) 
{
    setTimeout(function() 
        {
             myLCD.setCursor(0,0);
             myLCD.write(lines[i]);
             myLCD.setCursor(1,0);

             i++;
             if (i < lines.length)
             {
                myLCD.write(lines[i]);
             }
             else
             {
                myLCD.write(pad(" ", 16));
             }
        
             if (i + 1 < lines.length)
                 outputLines(i + 1, lines);
             else
                 processingRequest = false;

        }, 2500);
};

var pad = function(s, l)
{
    for(i=s.length; i<l; i++)
        s = s.concat(" ");
    return s;
}

var linifyJoke = function(joke, lineLength)
{   
    var wordNumber = 0;
    var words = joke.split(" ");
    if (words.length == 0) words.push("No joke for you!");
    
    var lines = [];
    var line = "";
    do
    {
        var word = words[wordNumber];
        if (word.length + line.length < lineLength)
            line = line.concat(line.length > 0 ? " " : "", word);
        else
        {
            lines.push(pad(line, lineLength));
            line = word;
        }
        wordNumber++;
    } while (wordNumber < words.length);
    
    lines.push(pad(line, lineLength));
    return lines;
}