Start using Symfony Components

src/Console/Command/GenerateCommand.php

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+<?php
+
+namespace Opdavies\GmailFilterBuilder\Console\Command;
+
+use Opdavies\GmailFilterBuilder\Builder;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class GenerateCommand extends Command
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function configure()
+    {
+        $this
+            ->setName('generate')
+            ->setDefinition([
+                new InputArgument('input-file', InputArgument::OPTIONAL, 'The name of the PHP file containing your filters.', 'filters.php'),
+                new InputArgument('output-file', InputArgument::OPTIONAL, 'The name of the XML file to generate.', 'filters.xml')
+            ])
+            ->setDescription('Generates XML for Gmail filters.')
+        ;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $inputFile = $input->getArgument('input-file');
+        $outputFile = $input->getArgument('output-file');
+
+        if (file_exists(__DIR__.'/../../../../'.$inputFile)) {
+            $filters = require(__DIR__.'/../../../../'.$inputFile);
+        } elseif (file_exists(__DIR__.'/../../../'.$inputFile)) {
+            $filters = require(__DIR__.'/../../../'.$inputFile);
+        } else {
+            throw new \Exception('No filters.php file found.');
+        }
+
+        echo new Builder($filters);
+    }
+}

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)]);
+        }
+    }
+}

src/Container/Container.php

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+<?php
+
+namespace Opdavies\GmailFilterBuilder\Container;
+
+use Symfony\Component\Config\FileLocator;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
+
+class Container
+{
+    public function __construct()
+    {
+        $this->containerBuilder = new ContainerBuilder();
+        $loader = new YamlFileLoader($this->containerBuilder, new FileLocator(__DIR__.'/../../config'));
+        $loader->load('services.yml');
+        $this->containerBuilder->addCompilerPass(new CommandCompilerClass());
+        $this->containerBuilder->compile();
+    }
+
+    public function get($className)
+    {
+        return $this->containerBuilder->get($className);
+    }
+}