Allowed registering custom commands

src/Event/RegisterCommandsEvent.php

@@ -0,0 +1,56 @@
+<?php
+/*
+ * This file is part of the Magallanes package.
+ *
+ * (c) Andrés Montañez <andres@andresmontanez.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Mage\Event;
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\EventDispatcher\Event;
+
+class RegisterCommandsEvent extends Event
+{
+    const EVENT_NAME = 'mage.event.register_commands';
+
+    /**
+     * @var Command[]
+     */
+    private $commands;
+
+    /**
+     * @return Command[]
+     */
+    public function getCommands()
+    {
+        return $this->commands;
+    }
+
+    /**
+     * @param array $commands
+     *
+     * @return RegisterCommandsEvent
+     */
+    public function setCommands(array $commands)
+    {
+        $this->commands = [];
+
+        foreach ($commands as $command) {
+            $this->addCommand($command);
+        }
+
+        return $this;
+    }
+
+    /**
+     * @param Command $command
+     */
+    public function addCommand(Command $command)
+    {
+        $this->commands[] = $command;
+    }
+}

src/MageApplication.php

@@ -11,6 +11,7 @@
 namespace Mage;
 
 use Mage\Command\AbstractCommand;
+use Mage\Event\RegisterCommandsEvent;
 use Mage\Runtime\Runtime;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\Finder\Finder;
@@ -58,6 +59,13 @@ class MageApplication extends Application
         $this->runtime = $this->instantiateRuntime();
         $this->runtime->setEventDispatcher($dispatcher);
         $this->loadBuiltInCommands();
+
+        $event = new RegisterCommandsEvent();
+        $dispatcher->dispatch(RegisterCommandsEvent::EVENT_NAME, $event);
+
+        foreach ($event->getCommands() as $command) {
+            $this->add($command);
+        }
     }
 
     /**