Add a base ServiceProvider with useful public APIs

src/Support/Extensions/ExtensionsServiceProvider.php

@@ -22,6 +22,7 @@ class ExtensionsServiceProvider extends ServiceProvider
      */
     public function register()
     {
+        $app = $this->app;
         $extensions = json_decode(DB::table('config')->where('key', 'extensions_enabled')->pluck('value'), true);
 
         foreach ($extensions as $extension) {

src/Support/ServiceProvider.php

@@ -0,0 +1,78 @@
+<?php namespace Flarum\Support;
+
+use Illuminate\Support\ServiceProvider as IlluminateServiceProvider;
+use Illuminate\Contracts\Events\Dispatcher;
+use Flarum\Core\Models\Notification;
+use Flarum\Core\Models\User;
+use Flarum\Core\Models\Post;
+
+class ServiceProvider extends IlluminateServiceProvider
+{
+    /**
+     * Register the service provider.
+     *
+     * @return void
+     */
+    public function register()
+    {
+        //
+    }
+
+    protected function forumAssets($assets)
+    {
+        $this->app['events']->listen('Flarum\Forum\Events\RenderView', function ($event) use ($assets) {
+            $event->assets->addFile($assets);
+        });
+    }
+
+    protected function postType($class)
+    {
+        Post::addType($class);
+    }
+
+    protected function discussionGambit($class)
+    {
+        $this->app['events']->listen('Flarum\Core\Events\RegisterDiscussionGambits', function ($event) use ($class) {
+            $event->gambits->add($class);
+        });
+    }
+
+    protected function notificationType($class, $defaultPreferences = [])
+    {
+        $notifier = $this->app['flarum.notifier'];
+
+        $notifier->registerType($class);
+
+        Notification::registerType($class);
+
+        foreach ($notifier->getMethods() as $method => $sender) {
+            if ($sender::compatibleWith($class)) {
+                User::registerPreference(User::notificationPreferenceKey($class::getType(), $method), 'boolval', array_get($defaultPreferences, $method, false));
+            }
+        }
+    }
+
+    protected function relationship($parent, $type, $name, $child = null)
+    {
+        $parent::addRelationship($name, function ($model) use ($type, $name, $child) {
+            if ($type instanceof Closure) {
+                return $type($model);
+            } elseif ($type === 'belongsTo') {
+                return $model->belongsTo($child, null, null, $name);
+            } else {
+                // @todo
+            }
+        });
+    }
+
+    protected function serializeRelationship($parent, $type, $name, $child = null)
+    {
+        $parent::addRelationship($name, function ($serializer) use ($type, $name, $child) {
+            if ($type instanceof Closure) {
+                return $type();
+            } else {
+                return $serializer->$type($child, $name);
+            }
+        });
+    }
+}