drupal_composer_builder/src/Builder.php

<?php
declare(strict_types = 1);

namespace Fgm\Drupal\Composer;

use Composer\Composer;
use Composer\EventDispatcher\EventSubscriberInterface;
use Composer\IO\IOInterface;
use Composer\Plugin\Capability\Capability;
use Composer\Plugin\Capability\CommandProvider;
use Composer\Plugin\Capable;
use Composer\Plugin\PluginInterface;
use Composer\Script\Event as ScriptEvent;
use Composer\Script\ScriptEvents;

class Builder implements Capable, Capability, EventSubscriberInterface, PluginInterface
{

    const NAME = "composer_builder";

    /**
     * @var \Composer\Composer
     */
    protected $composer;

    /**
     * @var \Composer\IO\IOInterface
     */
    protected $io;

    /**
     * {@inheritdoc}
     *
     * Available events:
     *
     * - Composer\Installer\InstallerEvents::* ->
     * Composer\Installer\InstallerEvent
     * - Composer\Installer\PackageEvents::* -> Composer\Installer\PackageEvent
     * - Composer\Installer\PluginEvents::INIT -> Composer\EventDispatcher\Event
     * - Composer\Installer\PluginEvents::COMMAND -> Composer\Plugin\CommandEvent
     * - Composer\Installer\PluginEvents::PRE_FILE_DOWNLOAD
     *     -> Composer\Plugin\PreFileDownloadEvent
     * - Composer\Script\ScriptEvents::* -> Composer\Script\Event
     */
    public static function getSubscribedEvents()
    {
        return [
          ScriptEvents::POST_INSTALL_CMD => 'onScriptEvent',
          ScriptEvents::POST_UPDATE_CMD => 'onScriptEvent',
        ];
    }

    /**
     * Apply plugin modifications to Composer
     *
     * @param Composer    $composer
     * @param IOInterface $io
     */
    public function activate(Composer $composer, IOInterface $io)
    {
        $this->composer = $composer;
        $this->io = $io;
    }

    /**
     * {@inheritDoc}
     */
    public function getCapabilities()
    {
        return [
          CommandProvider::class => BuilderCommandProvider::class,
        ];
    }

    /**
     * Event callback: run build:settings  on post-install|update only.
     *
     * @param \Composer\Script\Event $event
     *
     * @throws \Exception
     */
    public function onScriptEvent(ScriptEvent $event)
    {
        if (in_array($event->getName(), [
            ScriptEvents::POST_INSTALL_CMD,
            ScriptEvents::POST_UPDATE_CMD,
          ]
        )
        ) {
            // FIXME add behavior where, without an argument, the command will build all templates.
            // $buildCommand = new BuildSettingsCommand($event->getName());
            // $buildCommand->run(new ArgvInput([]), new ConsoleOutput());
        }
    }
}