added a main Debug class to ease integration

src/Symfony/Component/Debug/Debug.php

@@ -0,0 +1,39 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Debug;
+
+use Symfony\Component\ClassLoader\DebugClassLoader;
+
+/**
+ * Registers all the debug tools.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Debug
+{
+    public static function enable($errorReportingLevel = null)
+    {
+        error_reporting(-1);
+        ini_set('display_errors', 0);
+
+        ErrorHandler::register($errorReportingLevel);
+        if ('cli' !== php_sapi_name()) {
+            ExceptionHandler::register();
+        } elseif (!ini_get('log_errors') || ini_get('error_log')) {
+            ini_set('display_errors', 1);
+        }
+
+        if (class_exists('Symfony\Component\ClassLoader\DebugClassLoader')) {
+            DebugClassLoader::enable();
+        }
+    }
+}

src/Symfony/Component/Debug/README.md

@@ -3,22 +3,29 @@ Debug Component
 
 Debug provides tools to make debugging easier.
 
-Here is classic usage of the main provided tools::
+Enabling all debug tools is as easy as calling the `enable()` method on the
+main `Debug` class:
+
+    use Symfony\Component\Debug\Debug;
+
+    Debug::enable();
+
+You can also use the tools individually:
 
     use Symfony\Component\Debug\ErrorHandler;
     use Symfony\Component\Debug\ExceptionHandler;
 
     error_reporting(-1);
 
-    ErrorHandler::register($this->errorReportingLevel);
+    ErrorHandler::register($errorReportingLevel);
     if ('cli' !== php_sapi_name()) {
         ExceptionHandler::register();
     } elseif (!ini_get('log_errors') || ini_get('error_log')) {
         ini_set('display_errors', 1);
     }
 
-    // from the ClassLoader component
-    DebugClassLoader::enable();
+Not that the `Debug::enable()` call also registers the debug class loader from
+the Symfony ClassLoader component when available.
 
 Resources
 ---------

src/Symfony/Component/Debug/composer.json

@@ -18,6 +18,9 @@
     "require": {
         "php": ">=5.3.3"
     },
+    "suggest": {
+        "symfony/class-loader": "2.2.*"
+    }
     "autoload": {
         "psr-0": { "Symfony\\Component\\Debug\\": "" }
     },

src/Symfony/Component/HttpKernel/Kernel.php

@@ -57,7 +57,6 @@ abstract class Kernel implements KernelInterface, TerminableInterface
     protected $name;
     protected $startTime;
     protected $classes;
-    protected $errorReportingLevel;
 
     const VERSION         = '2.3.0-DEV';
     const VERSION_ID      = '20300';