Shift code into app/src

Add autoloading bootstrapping

app/src/Page.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace {
+
+    use SilverStripe\CMS\Model\SiteTree;
+
+    class Page extends SiteTree
+    {
+        private static $db = [];
+
+        private static $has_one = [];
+    }
+}

app/src/PageController.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace {
+
+    use SilverStripe\CMS\Controllers\ContentController;
+
+    class PageController extends ContentController
+    {
+        /**
+         * An array of actions that can be accessed via a request. Each array element should be an action name, and the
+         * permissions or conditions required to allow the user to access it.
+         *
+         * <code>
+         * [
+         *     'action', // anyone can access this action
+         *     'action' => true, // same as above
+         *     'action' => 'ADMIN', // you must have ADMIN permissions to access this action
+         *     'action' => '->checkAction' // you can only access this action if $this->checkAction() returns true
+         * ];
+         * </code>
+         *
+         * @var array
+         */
+        private static $allowed_actions = [];
+
+        protected function init()
+        {
+            parent::init();
+            // You can include any CSS or JS required by your project here.
+            // See: https://docs.silverstripe.org/en/developer_guides/templates/requirements/
+        }
+    }
+}

composer.json

@@ -20,9 +20,16 @@
     "require-dev": {
         "phpunit/PHPUnit": "^5.7"
     },
+    "autoload": {
+        "psr-4": {},
+        "classmap": [
+            "app/src/Page.php",
+            "app/src/PageController.php"
+        ]
+    },
     "extra": {
         "project-files": [
-            "mysite/code/*"
+            "app/src/*"
         ],
         "branch-alias": {
             "1.x-dev": "1.2.x-dev"

mysite/code/Page.php

@@ -1,10 +0,0 @@
-<?php
-
-use SilverStripe\CMS\Model\SiteTree;
-
-class Page extends SiteTree
-{
-    private static $db = [];
-
-    private static $has_one = [];
-}

mysite/code/PageController.php

@@ -1,30 +0,0 @@
-<?php
-
-use SilverStripe\CMS\Controllers\ContentController;
-
-class PageController extends ContentController
-{
-    /**
-     * An array of actions that can be accessed via a request. Each array element should be an action name, and the
-     * permissions or conditions required to allow the user to access it.
-     *
-     * <code>
-     * [
-     *     'action', // anyone can access this action
-     *     'action' => true, // same as above
-     *     'action' => 'ADMIN', // you must have ADMIN permissions to access this action
-     *     'action' => '->checkAction' // you can only access this action if $this->checkAction() returns true
-     * ];
-     * </code>
-     *
-     * @var array
-     */
-    private static $allowed_actions = [];
-
-    protected function init()
-    {
-        parent::init();
-        // You can include any CSS or JS required by your project here.
-        // See: https://docs.silverstripe.org/en/developer_guides/templates/requirements/
-    }
-}