composer如何创建和使用一个composer插件

mkdir my-composer-plugin
cd my-composer-plugin
composer init

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

<?php

namespace MyComposerPlugin;

use ComposerComposer;
use ComposerIOIOInterface;
use ComposerPluginPluginInterface;
use ComposerEventDispatcherEventSubscriberInterface;
use ComposerScriptScriptEvents;
use ComposerInstallerPackageEvent;

class MyPlugin implements PluginInterface, EventSubscriberInterface
{
    protected $composer;
    protected $io;

    public function activate(Composer $composer, IOInterface $io)
    {
        $this->composer = $composer;
        $this->io = $io;
    }

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

    public function onPostInstall($event)
    {
        $this->io->write('<info>[MyPlugin] 安装完成，执行自定义操作...</info>');
        // 可以在这里执行文件生成、配置写入等
    }

    public function onPostUpdate($event)
    {
        $this->io->write('<info>[MyPlugin] 更新完成，清理缓存...</info>');
    }
}

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

composer require your-vendor/my-composer-plugin

composer require your-vendor/my-composer-plugin

composer install