Symfony4 support

src/ServiceContainer/SymfonyExtension.php

@@ -27,6 +27,7 @@ use Symfony\Component\DependencyInjection\Container;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\Dotenv\Dotenv;
 
 final class SymfonyExtension implements Extension
 {
@@ -90,6 +91,7 @@ final class SymfonyExtension implements Extension
         $builder
             ->addDefaultsIfNotSet()
                 ->children()
+                    ->scalarNode('env_file')->defaultNull()->end()
                     ->arrayNode('kernel')
                         ->addDefaultsIfNotSet()
                         ->children()
@@ -110,6 +112,15 @@ final class SymfonyExtension implements Extension
      */
     public function load(ContainerBuilder $container, array $config): void
     {
+        if (null !== $config['env_file']) {
+            $this->loadEnvVars($container, $config['env_file']);
+
+            $environment = getenv('APP_ENV');
+            $config['kernel']['env'] = $environment ?? 'test';
+        } else {
+            $this->requireKernelBootstrapFile($container->getParameter('paths.base'), $config['bootstrap']);
+        }
+
         $this->loadKernel($container, $config['kernel']);
         $this->loadKernelContainer($container);
 
@@ -129,6 +140,16 @@ final class SymfonyExtension implements Extension
     {
     }
 
+    /**
+     * @param ContainerBuilder $container
+     * @param string           $fileName
+     */
+    private function loadEnvVars(ContainerBuilder $container, string $fileName): void
+    {
+        $envFilePath = sprintf('%s/%s', $container->getParameter('paths.base'), $fileName);
+        (new Dotenv())->load($envFilePath);
+    }
+
     /**
      * @param ContainerBuilder $container
      */
@@ -142,8 +163,6 @@ final class SymfonyExtension implements Extension
         $definition->setFile($this->getKernelFile($container->getParameter('paths.base'), $config['path']));
 
         $container->setDefinition(self::KERNEL_ID, $definition);
-
-        $this->requireKernelBootstrapFile($container->getParameter('paths.base'), $config['bootstrap']);
     }
 
     /**
@@ -203,6 +222,8 @@ final class SymfonyExtension implements Extension
 
     /**
      * @param ContainerBuilder $container
+     *
+     * @throws \Exception
      */
     private function declareSymfonyContainers(ContainerBuilder $container): void
     {