plugin manager

src/Psy/Command/DemoCommand.php

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+<?php
+
+namespace Psy\Command;
+
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class DemoCommand extends Command
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('demo')
+            ->setDefinition(array(
+                new InputOption('message', 'm', InputOption::VALUE_REQUIRED, 'Message to send.'),
+            ))
+            ->setDescription('Sample command just for testing.')
+            ->setHelp(
+                <<<HELP
+HELP
+            );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $message = $input->getOption('message');
+        $output->writeln(sprintf('<info>Received message "%s". </info>', $message));
+    }
+}

src/Psy/Plugin/AbstractPlugin.php

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+<?php
+
+namespace Psy\Plugin;
+
+abstract class AbstractPlugin
+{
+    public static function register()
+    {
+        Manager::register(new static(), static::getName());
+    }
+
+    /**
+     * @return string
+     */
+    final public static function getName()
+    {
+        $class = new \ReflectionClass(get_called_class());
+
+        return preg_replace('#Plugin$#', '', $class->getShortName());
+    }
+
+    /**
+     * @param array $configuration
+     *
+     * @return array
+     */
+    final public static function getConfiguration($configuration = array())
+    {
+        return array_merge_recursive(
+            $configuration,
+            array(
+               'commands'   => static::getCommands(),
+               'presenters' => static::getPresenters(),
+               'matchers'   => static::getMatchers(),
+                // if any more parts of the config are exposed publicly, remember to add here with the static ref.
+            )
+        );
+    }
+
+    // any publicly exposed configuration piece below here ↓
+
+    /**
+     * @return array
+     */
+    public static function getCommands()
+    {
+        // add your own commands
+        return array();
+    }
+
+    /**
+     * @return array
+     */
+    public static function getPresenters()
+    {
+        // add your own presenters
+        return array();
+    }
+
+    /**
+     * @return array
+     */
+    public static function getMatchers()
+    {
+        // add your own presenters
+        return array();
+    }
+}

src/Psy/Plugin/DemoPlugin.php

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+<?php
+
+namespace Psy\Plugin;
+
+use Psy\Command\DemoCommand;
+
+class DemoPlugin extends AbstractPlugin
+{
+    /**
+     * @return array
+     */
+    public static function getCommands()
+    {
+        return array(
+            new DemoCommand(),
+        );
+    }
+}

src/Psy/Plugin/Manager.php

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+<?php
+
+namespace Psy\Plugin;
+
+class Manager
+{
+    /** @var AbstractPlugin[] */
+    protected static $plugins = array();
+
+    /**
+     * @param AbstractPlugin $plugin
+     * @param $name
+     */
+    public static function register(AbstractPlugin $plugin, $name)
+    {
+        self::$plugins[$name] = $plugin;
+    }
+
+    /**
+     * @param array $configuration
+     *
+     * @return array
+     */
+    public static function getConfiguration($configuration = array())
+    {
+        foreach (self::$plugins as $plugin) {
+            $configuration = $plugin::getConfiguration($configuration);
+        }
+
+        return $configuration;
+    }
+}