Add base for handling and storing progress

Gruntfile.js

@@ -31,11 +31,15 @@ module.exports = function (grunt) {
                     include: ["requireLib"],
                     paths: {
                         "jQuery": 'vendors/jquery',
+                        "lodash": 'vendors/lodash',
                         "requireLib": 'vendors/require',
                     },
                     shim: {
                         'jQuery': {
                             exports: '$'
+                        },
+                        'lodash': {
+                            exports: '_'
                         }
                     }
                 }

assets/javascript/app.js

@@ -1,6 +1,7 @@
 require([
-    "jQuery"
-], function($){
+    "jQuery",
+    "progress"
+], function($, progress){
     $(document).ready(function() {
         var $book = $(".book");
         var githubId = $book.data("github");

assets/javascript/progress.js

@@ -0,0 +1,59 @@
+define([
+    "lodash",
+    "jQuery",
+    "utils/storage"
+], function(_, $, storage) {
+    // Get current level
+    var getCurrentLevel = function() {
+        return $(".book").data("level");
+    };
+
+    // Return all levels
+    var getLevels = function() {
+        var levels = $(".book-summary li[data-level]");
+        return _.map(levels, function(level) {
+            return $(level).data("level");
+        });
+    };
+
+    // Return a map chapter -> number (timestamp)
+    var getProgress = function() {
+        // Current level
+        var progress = storage.get("progress", {});
+
+        // Levels
+        var levels = getLevels();
+
+        _.each(levels, function(level) {
+            progress[level] = progress[level] || 0;
+        });
+
+        return progress;
+    };
+
+    // Change value of progress for a level
+    var markProgress = function(level, state) {
+        if (state == null) state = true;
+
+        var progress = getProgress();
+        progress[level] = state? Date.now() : 0;
+    };
+
+    // Show progress
+    var showProgress = function() {
+        var progress = getProgress();
+        var $summary = $(".book-summary");
+
+        _.each(progress, function(value, level) {
+            $summary.find("li[data-level='"+level+"']").toggleClass("done", value > 0);
+        });
+    };
+
+    return {
+        'current': getCurrentLevel,
+        'levels': getLevels,
+        'get': getProgress,
+        'mark': markProgress,
+        'show': showProgress
+    };
+});

assets/javascript/utils/storage.js

@@ -0,0 +1,20 @@
+define(function(){
+    /*
+     * Simple module for storing data in the browser's local storage
+     */
+    return {
+        set: function(key, value) {
+            localStorage[key] = JSON.stringify(value);
+        },
+        get: function(key, def) {
+            try {
+                return JSON.parse(localStorage[key]) || def;
+            } catch(err) {
+                return localStorage[key] || def;
+            }
+        },
+        remove: function(key) {
+            localStorage.removeItem(key);
+        }
+    };
+});