Package.js

package.js

// Package.js
// by Andrew Smith [[email protected]]

// Package.create("pages/signup", function(){
//   
//   // You can load dependencies--nothing will be loaded twice!
//   Package.load("plugins/something");
//   
//   // Put your code here!
//   // Remember, variables you define here must be global if you
//   // want other packages to be able to access them. I recommend
//   // attaching desired global variables to `window` to make them
//   // appear explicitly global--that way there is no confusion.
//   
// });
// 
// Package.load("pages/signup");  <-- loads signup code
// Package.load("pages");         <-- loads all pages
// Package.load("one two three"); <-- load multiple things

window._packages = {
  _loaded: {}
};

var Package = {
  create: function(path, code) {
    this.pathfinder(path, code);
  },
  
  load: function(path) {
    if (path.indexOf(' ') >= 0) {
      var paths = path.split(' ');
      for (var i=0; i<paths.length; i++) {
        this.load(paths[i]);
      }
      return;
    }
    
    var code = this.pathfinder(path);
    
    // Only load this if it hasn't been loaded before
    if (! window._packages._loaded[path]) {
      if (typeof(code) == 'function') {
        code();
      }
      // Attempt to load everything in this object
      else if (typeof(code) == 'object') {
        
        for (var x in code) {
          if (typeof(x) == 'string') {
            if (x != "_loaded") this.load(path + "/" + x);
          }
        }
        
      } else {
        throw("Package: couldn't load `" + path + "` because there's no code there!");
      }
      
      window._packages._loaded[path] = true;
    }
  },
  
  pathfinder: function(path, value) {
    path = path.replace(/\/{2,}/g, "/").split('/'); // Replace multiple slashes with one slash
    var base = window._packages;
    var last = base;
    
    if (path[0] == "_loaded") throw("Package: _loaded is reserved, please use something else");
    
    // Iterate through each path segment
    for (var i=0; i<path.length; i++) {
      var segment = path[i];
      
      // If we're at the last segment
      if (i + 1 == path.length) {
        // Return the result or set it with the value
        if (value == undefined) {
          return last[segment];
        } else {
          last[segment] = value;
        }
      } else {
        // Make the segment an object if it isn't already
        if (typeof(last[segment]) != 'object') {
          last = last[segment] = {};
        } else {
          last = last[segment];
        }
      }
    }
    
    return window._packages = base;
  }
};