feature #17504 [Console] Show code when an exception is thrown (maidmaid)

This PR was squashed before being merged into the 3.1-dev branch (closes #17504).

Discussion
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[Console] Show code when an exception is thrown

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Hi !

When an exception is thrown, sf console doesn't show the code exception, while this code is very useful during developpement (for example, [guzzle put http status code in his code exception](https://github.com/guzzle/guzzle/blob/6.1.1/src/Exception/RequestException.php#L30-L33)).

I propose you that we show the code exception only when the code exception > 0 and with ``-v`` verbosity. It means :

- ``throw new Exception('Not found', 0)`` with normal verbosity --> no change
- ``throw new Exception('Not found', 0)`` with ``-v`` verbosity --> no change
- ``throw new Exception('Not found', 404)`` with normal verbosity --> no change
- **but** ``throw new Exception('Not found', 404)`` with ``-v`` verbosity --> showing :

![image](https://cloud.githubusercontent.com/assets/4578773/12530638/052991f2-c1e5-11e5-92f1-b7b3f60cc4ba.png)

Commits
-------

f8cd9e8 [Console] Show code when an exception is thrown

src/Symfony/Component/Console/Application.php

@@ -588,7 +588,11 @@ class Application
         $output->writeln('', OutputInterface::VERBOSITY_QUIET);
 
         do {
-            $title = sprintf('  [%s]  ', get_class($e));
+            $title = sprintf(
+                '  [%s%s]  ',
+                get_class($e),
+                $output->isVerbose() && 0 !== ($code = $e->getCode()) ? ' ('.$code.')' : ''
+            );
 
             $len = $this->stringWidth($title);
 

src/Symfony/Component/Console/Tests/ApplicationTest.php

@@ -520,6 +520,11 @@ class ApplicationTest extends \PHPUnit_Framework_TestCase
         $tester->run(array('command' => 'foo3:bar'), array('decorated' => false));
         $this->assertStringEqualsFile(self::$fixturesPath.'/application_renderexception3.txt', $tester->getDisplay(true), '->renderException() renders a pretty exceptions with previous exceptions');
 
+        $tester->run(array('command' => 'foo3:bar'), array('decorated' => false, 'verbosity' => Output::VERBOSITY_VERBOSE));
+        $this->assertRegExp('/\[Exception\]\s*First exception/', $tester->getDisplay(), '->renderException() renders a pretty exception without code exception when code exception is default and verbosity is verbose');
+        $this->assertRegExp('/\[Exception\]\s*Second exception/', $tester->getDisplay(), '->renderException() renders a pretty exception without code exception when code exception is 0 and verbosity is verbose');
+        $this->assertRegExp('/\[Exception \(404\)\]\s*Third exception/', $tester->getDisplay(), '->renderException() renders a pretty exception with code exception when code exception is 404 and verbosity is verbose');
+
         $tester->run(array('command' => 'foo3:bar'), array('decorated' => true));
         $this->assertStringEqualsFile(self::$fixturesPath.'/application_renderexception3decorated.txt', $tester->getDisplay(true), '->renderException() renders a pretty exceptions with previous exceptions');
 

src/Symfony/Component/Console/Tests/Fixtures/Foo3Command.php

@@ -23,7 +23,7 @@ class Foo3Command extends Command
                 throw new \Exception('Second exception <comment>comment</comment>', 0, $e);
             }
         } catch (\Exception $e) {
-            throw new \Exception('Third exception <fg=blue;bg=red>comment</>', 0, $e);
+            throw new \Exception('Third exception <fg=blue;bg=red>comment</>', 404, $e);
         }
     }
 }