[Console] Allow to catch CommandNotFoundException

src/Symfony/Component/Console/Application.php

@@ -128,8 +128,8 @@ public function run(InputInterface $input = null, OutputInterface $output = null
             $exception = new FatalThrowableError($e);
         }
 
-        if (null !== $this->runningCommand && null !== $e && null !== $this->dispatcher) {
-            $event = new ConsoleErrorEvent($this->runningCommand, $input, $output, $e, $e->getCode());
+        if (null !== $e && null !== $this->dispatcher) {
+            $event = new ConsoleErrorEvent($input, $output, $e, $e->getCode(), $this->runningCommand);
             $this->dispatcher->dispatch(ConsoleEvents::ERROR, $event);
 
             $e = $event->getError();

src/Symfony/Component/Console/CHANGELOG.md

@@ -10,6 +10,8 @@ CHANGELOG
   with value optional explicitly passed empty
 * added console.error event to catch exceptions thrown by other listeners
 * deprecated console.exception event in favor of console.error
+* added ability to handle `CommandNotFoundException` through the 
+ `console.error` event
 
 3.2.0
 ------

src/Symfony/Component/Console/Event/ConsoleErrorEvent.php

@@ -27,7 +27,7 @@ class ConsoleErrorEvent extends ConsoleExceptionEvent
     private $error;
     private $handled = false;
 
-    public function __construct(Command $command, InputInterface $input, OutputInterface $output, $error, $exitCode)
+    public function __construct(InputInterface $input, OutputInterface $output, $error, $exitCode, Command $command = null)
     {
         if (!$error instanceof \Throwable && !$error instanceof \Exception) {
             throw new InvalidArgumentException(sprintf('The error passed to ConsoleErrorEvent must be an instance of \Throwable or \Exception, "%s" was passed instead.', is_object($error) ? get_class($error) : gettype($error)));

src/Symfony/Component/Console/Event/ConsoleExceptionEvent.php

@@ -27,7 +27,7 @@ class ConsoleExceptionEvent extends ConsoleEvent
     private $exception;
     private $exitCode;
 
-    public function __construct(Command $command, InputInterface $input, OutputInterface $output, \Exception $exception, $exitCode, $deprecation = true)
+    public function __construct(Command $command = null, InputInterface $input, OutputInterface $output, \Exception $exception, $exitCode, $deprecation = true)
     {
         if ($deprecation) {
             @trigger_error(sprintf('The %s class is deprecated since version 3.3 and will be removed in 4.0. Use the ConsoleErrorEvent instead.', __CLASS__), E_USER_DEPRECATED);

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

@@ -1051,6 +1051,26 @@ public function testRunAllowsErrorListenersToSilenceTheException()
         $this->assertEquals(0, $tester->getStatusCode());
     }
 
+    public function testConsoleErrorEventIsTriggeredOnCommandNotFound()
+    {
+        $dispatcher = new EventDispatcher();
+        $dispatcher->addListener('console.error', function (ConsoleErrorEvent $event) {
+            $this->assertNull($event->getCommand());
+            $this->assertInstanceOf(CommandNotFoundException::class, $event->getError());
+            $event->getOutput()->write('silenced command not found');
+            $event->markErrorAsHandled();
+        });
+
+        $application = new Application();
+        $application->setDispatcher($dispatcher);
+        $application->setAutoExit(false);
+
+        $tester = new ApplicationTester($application);
+        $tester->run(array('command' => 'unknown'));
+        $this->assertContains('silenced command not found', $tester->getDisplay());
+        $this->assertEquals(0, $tester->getStatusCode());
+    }
+
     /**
      * @group legacy
      * @expectedDeprecation The "console.exception" event is deprecated since version 3.3 and will be removed in 4.0. Use the "console.error" event instead.

src/Symfony/Component/Console/Tests/EventListener/ExceptionListenerTest.php

@@ -111,7 +111,7 @@ private function getLogger()
 
     private function getConsoleErrorEvent(\Exception $exception, InputInterface $input, $exitCode)
     {
-        return new ConsoleErrorEvent(new Command('test:run'), $input, $this->getOutput(), $exception, $exitCode);
+        return new ConsoleErrorEvent($input, $this->getOutput(), $exception, $exitCode, new Command('test:run'));
     }
 
     private function getConsoleTerminateEvent(InputInterface $input, $exitCode)