first commit

plugins/sampledata/blog/blog.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<extension type="plugin" group="sampledata" method="upgrade">
+	<name>plg_sampledata_blog</name>
+	<author>Joomla! Project</author>
+	<creationDate>2017-07</creationDate>
+	<copyright>(C) 2017 Open Source Matters, Inc.</copyright>
+	<license>GNU General Public License version 2 or later; see LICENSE.txt</license>
+	<authorEmail>admin@joomla.org</authorEmail>
+	<authorUrl>www.joomla.org</authorUrl>
+	<version>3.8.0</version>
+	<description>PLG_SAMPLEDATA_BLOG_XML_DESCRIPTION</description>
+	<namespace path="src">Joomla\Plugin\SampleData\Blog</namespace>
+	<files>
+		<folder plugin="blog">services</folder>
+		<folder>src</folder>
+	</files>
+	<languages>
+		<language tag="en-GB">language/en-GB/plg_sampledata_blog.ini</language>
+		<language tag="en-GB">language/en-GB/plg_sampledata_blog.sys.ini</language>
+	</languages>
+	<config>
+		<fields name="params">
+		</fields>
+	</config>
+</extension>

plugins/sampledata/blog/services/provider.php

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+<?php
+
+/**
+ * @package     Joomla.Plugin
+ * @subpackage  Sampledata.blog
+ *
+ * @copyright   (C) 2023 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+\defined('_JEXEC') or die;
+
+use Joomla\CMS\Extension\PluginInterface;
+use Joomla\CMS\Factory;
+use Joomla\CMS\Plugin\PluginHelper;
+use Joomla\Database\DatabaseInterface;
+use Joomla\DI\Container;
+use Joomla\DI\ServiceProviderInterface;
+use Joomla\Event\DispatcherInterface;
+use Joomla\Plugin\SampleData\Blog\Extension\Blog;
+
+return new class () implements ServiceProviderInterface {
+    /**
+     * Registers the service provider with a DI container.
+     *
+     * @param   Container  $container  The DI container.
+     *
+     * @return  void
+     *
+     * @since   4.4.0
+     */
+    public function register(Container $container): void
+    {
+        $container->set(
+            PluginInterface::class,
+            function (Container $container) {
+                $plugin     = new Blog(
+                    $container->get(DispatcherInterface::class),
+                    (array) PluginHelper::getPlugin('sampledata', 'blog')
+                );
+                $plugin->setApplication(Factory::getApplication());
+                $plugin->setDatabase($container->get(DatabaseInterface::class));
+
+                return $plugin;
+            }
+        );
+    }
+};