Add option to disable memory spool

Conflicts:
	src/Silex/Provider/SwiftmailerServiceProvider.php

doc/providers/swiftmailer.rst

@@ -10,6 +10,8 @@ will attempt to send emails through SMTP.
 Parameters
 ----------
 
+* **swiftmailer.use_spool**: A boolean to specify whether or not to use the
+  memory spool, defaults to true. 
 * **swiftmailer.options**: An array of options for the default SMTP-based
   configuration.
 
@@ -97,13 +99,17 @@ The Swiftmailer provider provides a ``mailer`` service::
 Usage in commands
 ~~~~~~~~~~~~~~~~~
 
-The Swiftmailer provider sends the emails using the ``KernelEvents::TERMINATE``
+By default, the Swiftmailer provider sends the emails using the ``KernelEvents::TERMINATE``
 event, which is fired after the response has been sent. However, as this event
 isn't fired for console commands, your emails won't be sent.
 
-For that reason, if you send emails using a command console, make sure to
-flush the message spool by hand before ending the command execution. To do so,
-use the following code::
+For that reason, if you send emails using a command console, it is recommended
+that you disable the use of the memory spool (before accessing ``$app['mailer']``)::
+
+    $app['swiftmailer.use_spool'] = false;
+
+Alternatively, you can just make sure to flush the message spool by hand before
+ending the command execution. To do so, use the following code::
 
     $app['swiftmailer.spooltransport']
         ->getSpool()

src/Silex/Provider/SwiftmailerServiceProvider.php

@@ -24,13 +24,15 @@ class SwiftmailerServiceProvider implements ServiceProviderInterface
     public function register(Application $app)
     {
         $app['swiftmailer.options'] = array();
+        $app['swiftmailer.use_spool'] = true;
 
         $app['mailer.initialized'] = false;
 
         $app['mailer'] = $app->share(function ($app) {
             $app['mailer.initialized'] = true;
+            $transport = $app['swiftmailer.use_spool'] ? $app['swiftmailer.spooltransport'] : $app['swiftmailer.transport'];
 
-            return new \Swift_Mailer($app['swiftmailer.spooltransport']);
+            return new \Swift_Mailer($transport);
         });
 
         $app['swiftmailer.spooltransport'] = $app->share(function ($app) {

tests/Silex/Tests/Provider/SwiftmailerServiceProviderTest.php

@@ -27,6 +27,22 @@ public function testSwiftMailerServiceIsSwiftMailer()
         $this->assertInstanceOf('Swift_Mailer', $app['mailer']);
     }
 
+    public function testSwiftMailerIgnoresSpoolIfDisabled()
+    {
+        $app = new Application();
+
+        $app->register(new SwiftmailerServiceProvider());
+        $app->boot();
+
+        $app['swiftmailer.use_spool'] = false;
+
+        $app['swiftmailer.spooltransport'] = function () {
+            throw new \Exception("Should not be instantiated");
+        };
+
+        $this->assertInstanceOf('Swift_Mailer', $app['mailer']);
+    }
+
     public function testSwiftMailerSendsMailsOnFinish()
     {
         $app = new Application();