Start using Symfony Components

src/Container/CommandCompilerClass.php

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+<?php
+
+namespace Opdavies\GmailFilterBuilder\Container;
+
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
+
+class CommandCompilerClass implements CompilerPassInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function process(ContainerBuilder $container) {
+        $definition = $container->findDefinition('app.cli');
+        $taggedServices = $container->findTaggedServiceIds('ConsoleCommand');
+
+        foreach ($taggedServices as $id => $tags) {
+            $definition->addMethodCall('add', [new Reference($id)]);
+        }
+    }
+}