bug symfony#5379 [Cookbook][Console] don't use BufferedOutput on Symfony 2.3 (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
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[Cookbook][Console] don't use BufferedOutput on Symfony 2.3

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets | symfony#5299 (comment)

As @stof pointed out in symfony#5299 (comment), the `StreamOutput` class is not available on Symfony 2.3. This should be reverted after merging it up to the `2.6` branch.

Commits
-------

4e9e0dd don't use BufferedOutput on Symfony 2.3

Author: wouterj

cookbook/console/command_in_controller.rst

@@ -30,7 +30,7 @@ Run this command from inside your controller via::
     use Symfony\Bundle\FrameworkBundle\Console\Application;
     use Symfony\Bundle\FrameworkBundle\Controller\Controller;
     use Symfony\Component\Console\Input\ArrayInput;
-    use Symfony\Component\Console\Output\BufferedOutput;
+    use Symfony\Component\Console\Output\StreamOutput;
     use Symfony\Component\HttpFoundation\Response;
 
     class SpoolController extends Controller
@@ -46,12 +46,14 @@ Run this command from inside your controller via::
                '--message-limit' => $messages,
             ));
             // You can use NullOutput() if you don't need the output
-            $output = new BufferedOutput();
+            $output = new StreamOutput(tmpfile(), StreamOutput::VERBOSITY_NORMAL);
             $application->run($input, $output);
 
             // return the output, don't use if you used NullOutput()
-            $content = $output->fetch();
-            
+            rewind($output->getStream());
+            $content = stream_get_contents($output->getStream());
+            fclose($output->getStream());
+
             // return new Response(""), if you used NullOutput()
             return new Response($content);
         }
@@ -60,7 +62,7 @@ Run this command from inside your controller via::
 Showing Colorized Command Output
 --------------------------------
 
-By telling the ``BufferedOutput`` it is decorated via the second parameter,
+By telling the ``StreamOutput`` it is decorated via the third parameter,
 it will return the Ansi color-coded content. The `SensioLabs AnsiToHtml converter`_
 can be used to convert this to colorful HTML.
 
@@ -76,8 +78,8 @@ Now, use it in your controller::
     namespace AppBundle\Controller;
 
     use SensioLabs\AnsiConverter\AnsiToHtmlConverter;
-    use Symfony\Component\Console\Output\BufferedOutput;
     use Symfony\Component\Console\Output\OutputInterface;
+    use Symfony\Component\Console\Output\StreamOutput;
     use Symfony\Component\HttpFoundation\Response;
     // ...
 
@@ -86,15 +88,14 @@ Now, use it in your controller::
         public function sendSpoolAction($messages = 10)
         {
             // ...
-            $output = new BufferedOutput(
-                OutputInterface::VERBOSITY_NORMAL,
-                true // true for decorated
-            );
+            $output = new StreamOutput(tmpfile(), StreamOutput::VERBOSITY_NORMAL, true);
             // ...
 
             // return the output
             $converter = new AnsiToHtmlConverter();
-            $content = $output->fetch();
+            rewind($output->getStream());
+            $content = stream_get_contents($output->getStream());
+            fclose($output->getStream());
 
             return new Response($converter->convert($content));
         }