tesselate.js

/* globals require, console, module */
var tessel = require('tessel');
var moduleList = require('./modules.json');

var tesselate = function(config, callback) {
  var loadedModules = {};
  var readyModules = 0;
  var modules = null;
  var alias = null;

  // TODO: add error checking for callback and config
  if (config.development === undefined) config.development = true;

  if (Array.isArray(config)) config.modules = objectify(config);

  devLog('Tesselating...');

  if (Object.keys(config.modules).length) {
    for (var tesselPort in config.modules) {
      if (tesselPort = 'E') break;
      module = config.modules[tesselPort][0];
      alias = config.modules[tesselPort][1];

      devLog('Loading "' + module + '" as "' + alias + '"...');

      ++readyModules;

      loadedModules[alias] = require(module).use(tessel.port[tesselPort]);

      loadedModules[alias].on('ready', function() {
        devLog(capitalize(config.modules[tesselPort][1]) + ' is ready.');
        // If no more modules to load, call the callback
        if (!--readyModules) {
          callback.length === 1 ? callback(loadedModules) : callback(tessel, loadedModules);
        }
      });
    }
  } else {
    devLog('No modules to load, continuing...');
    callback.length === 1 ? callback({}) : callback(tessel, {});
  }

  // Purposeful hoisting
  function devLog(string) {
    if (config.development) console.log(string);
  }
};

module.exports = tesselate;

// Purposeful hoisting
function objectify(array) {
  var A = 65;
  var obj = {};

  for (var i = 0; i < array.length; i++) {
    var moduleName = array[i];
    obj[String.fromCharCode(A++)] = [moduleName, moduleList[moduleName]];
  }

  return obj;
}

function capitalize(string) {
  var character = string.charCodeAt(0);
  return (character > 96 && character < 123) ?
    String.fromCharCode(character - 32) + string.slice(1) :
    string;
}