如何编写一个自己的composer插件

{
  "name": "your-vendor/my-composer-plugin",
  "type": "composer-plugin",
  "require": {
    "php": "^8.0",
    "composer-plugin-api": "^2.0",
    "composer/composer": "^2.0"
  },
  "autoload": {
    "psr-4": {
      "YourVendor\Plugin\": "src/"
    }
  },
  "extra": {
    "class": "YourVendor\Plugin\MyPlugin"
  }
}

<?php

namespace YourVendorPlugin;

use ComposerComposer;
use ComposerIOIOInterface;
use ComposerPluginPluginInterface;
use ComposerEventDispatcherEventSubscriberInterface;
use ComposerScriptEvent;
use ComposerScriptScriptEvents;

class MyPlugin implements PluginInterface, EventSubscriberInterface
{
    public function activate(Composer $composer, IOInterface $io)
    {
        // 注册事件监听
        $composer->getEventDispatcher()->addSubscriber($this);
    }

    public static function getSubscribedEvents()
    {
        return [
            ScriptEvents::POST_INSTALL_CMD => 'onPostInstall',
            ScriptEvents::POST_UPDATE_CMD  => 'onPostUpdate',
        ];
    }

    public function onPostInstall(Event $event)
    {
        $io = $event->getIO();
        $io->write('<info>[MyPlugin] 执行安装后任务...</info>');
        // 可在此运行 shell 命令、生成文件等
    }

    public function onPostUpdate(Event $event)
    {
        $io = $event->getIO();
        $io->write('<info>[MyPlugin] 执行更新后任务...</info>');
    }
}

"repositories": [
  {
    "type": "path",
    "url": "../my-composer-plugin"
  }
],
"require-dev": {
  "your-vendor/my-composer-plugin": "*"
}