Add abtesting IDE plugin

configs/client-default.js

@@ -709,6 +709,7 @@ module.exports = function(options) {
                 premium: options.project.premium,
             }
         },
+        "plugins/c9.ide.abtesting/abtesting",
         {
             packagePath: "plugins/c9.ide.welcome/welcome",
             staticPrefix: staticPrefix + "/plugins/c9.ide.welcome",

plugins/c9.ide.abtesting/abtesting.js

@@ -0,0 +1,101 @@
+/**
+ * Client-side support for A/B testing experiments.
+ */
+define(function(require, exports, module) {
+    "use strict";
+
+    main.consumes = ["Plugin", "info", "c9.analytics"];
+    main.provides = ["abtesting"];
+    return main;
+
+    function main(options, imports, register) {
+        var Plugin = imports.Plugin;
+        var plugin = new Plugin("Ajax.org", main.consumes);
+        var info = imports.info;
+        var analytics = imports["c9.analytics"];
+        var outplan = require("outplan");
+        
+        var MS_PER_DAY = 1000 * 60 * 60 * 24;
+        
+        var userId;
+        
+        plugin.on("load", function() {
+            userId = info.getUser().id;
+            outplan.configure({
+                logFunction: function(e) {
+                    var label = e.name + " - " + e.event;
+                    analytics.track(label, { variation: e.params.name });
+                }
+            });
+        });
+        
+        plugin.on("unload", function() {
+            userId = undefined;
+        });
+        
+        function create(name, choices, options) {
+            return outplan.create(name, choices, options);
+        }
+        
+        function get(experimentName, overrideUserId) {
+            return outplan.get(experimentName, overrideUserId == null ? userId : overrideUserId);
+        }
+        
+        function isUserCreatedAfter(experimentDate) {
+            var diffDays = (experimentDate - experimentDate.now()) / MS_PER_DAY;
+            if (diffDays > 20) {
+                // Sanity check: new Date() takes zero-based month argument, one-based day argument
+                throw new Error("Passed a date far in the future to isUserCreatedAfter()");
+            }
+            return info.getUser().date_add > experimentDate;
+        }
+
+        /**
+         * Support for A/B testing experiments.
+         */
+        plugin.freezePublicAPI({
+            /**
+             * Create a new experiment. Alias for require("outplan").create()
+             * 
+             * @param {String|Number} userId
+             * @param {String} name
+             * @param {String[]|Object[]} choices
+             *        A list of variations, e.g. ["A", "B"],
+             *        or variation objects, e.g. [{ name: "A", color: "#AAA" }, { name: "B", color: "#BBB" }]
+             * @param {Object} [option]
+             *        Options for the experiment. This may also include
+             *        arguments for the distribution operator, e.g. weight.
+             * @param {Function} [options.operator]
+             *        The distribution operator, e.g. outplan.WeightedChoice  
+             */
+            create: create,
+            
+            /**
+             * Get the selected variation of an experiment. Alias for require("outplan").get()
+             * but doesn't require a userId
+             * 
+             * As a side effect, this calls the log function with an "expose" event
+             * with the selected experiment variation.
+             * 
+             * @param {String} name            The experiment name.
+             * @param {String|Number} [userId] A unique identifier for the current user.
+             */
+            get: get,
+            
+            /**
+             * Helper to determine if the current user was created after the start of an experiment.
+             * 
+             * @throws {Error} when a date in the future (~20 days from now) is passed.
+             *         This error is thrown as a sanity check to make sure `new Date()`
+             *         is called with a zero-based month argument (and a one-based day).
+             * 
+             * @param {Date} experimentDate
+             */
+            isUserCreatedAfter: isUserCreatedAfter,
+        });
+
+        register(null, {
+            "abtesting": plugin
+        });
+    }
+});

plugins/c9.ide.server/plugins.js

@@ -41,6 +41,7 @@ define(function(require, exports, module) {
                 ui: "lib/ui",
                 c9: "lib/c9",
                 frontdoor: "lib/frontdoor",
+                outplan: "lib/outplan/dist/outplan",
             };
             
             if (whitelist === "*") {
@@ -70,6 +71,7 @@ define(function(require, exports, module) {
                     "ui",
                     "emmet",
                     "frontdoor",
+                    "outplan",
                     "mocha", // TESTING
                     "chai",  // TESTING
                 ].forEach(function(name) {