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plugins/editors-xtd/readmore/readmore.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<extension type="plugin" group="editors-xtd" method="upgrade">
+	<name>plg_editors-xtd_readmore</name>
+	<author>Joomla! Project</author>
+	<creationDate>2006-03</creationDate>
+	<copyright>(C) 2006 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>3.0.0</version>
+	<description>PLG_READMORE_XML_DESCRIPTION</description>
+	<namespace path="src">Joomla\Plugin\EditorsXtd\ReadMore</namespace>
+	<files>
+		<folder plugin="readmore">services</folder>
+		<folder>src</folder>
+	</files>
+	<languages>
+		<language tag="en-GB">language/en-GB/plg_editors-xtd_readmore.ini</language>
+		<language tag="en-GB">language/en-GB/plg_editors-xtd_readmore.sys.ini</language>
+	</languages>
+</extension>

plugins/editors-xtd/readmore/services/provider.php

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+<?php
+
+/**
+ * @package     Joomla.Plugin
+ * @subpackage  Editors-xtd.article
+ *
+ * @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\DI\Container;
+use Joomla\DI\ServiceProviderInterface;
+use Joomla\Event\DispatcherInterface;
+use Joomla\Plugin\EditorsXtd\ReadMore\Extension\ReadMore;
+
+return new class () implements ServiceProviderInterface {
+    /**
+     * Registers the service provider with a DI container.
+     *
+     * @param   Container  $container  The DI container.
+     *
+     * @return  void
+     *
+     * @since   4.3.0
+     */
+    public function register(Container $container)
+    {
+        $container->set(
+            PluginInterface::class,
+            function (Container $container) {
+                $dispatcher = $container->get(DispatcherInterface::class);
+
+                $plugin     = new ReadMore(
+                    $dispatcher,
+                    (array) PluginHelper::getPlugin('editors-xtd', 'readmore')
+                );
+                $plugin->setApplication(Factory::getApplication());
+
+                return $plugin;
+            }
+        );
+    }
+};

plugins/editors-xtd/readmore/src/Extension/ReadMore.php

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+<?php
+
+/**
+ * @package     Joomla.Plugin
+ * @subpackage  Editors-xtd.readmore
+ *
+ * @copyright   (C) 2006 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+namespace Joomla\Plugin\EditorsXtd\ReadMore\Extension;
+
+use Joomla\CMS\Language\Text;
+use Joomla\CMS\Object\CMSObject;
+use Joomla\CMS\Plugin\CMSPlugin;
+
+// phpcs:disable PSR1.Files.SideEffects
+\defined('_JEXEC') or die;
+// phpcs:enable PSR1.Files.SideEffects
+
+/**
+ * Editor Readmore button
+ *
+ * @since  1.5
+ */
+final class ReadMore extends CMSPlugin
+{
+    /**
+     * Load the language file on instantiation.
+     *
+     * @var    boolean
+     * @since  3.1
+     */
+    protected $autoloadLanguage = true;
+
+    /**
+     * Readmore button
+     *
+     * @param   string  $name  The name of the button to add
+     *
+     * @return  CMSObject  $button  A two element array of (imageName, textToInsert)
+     *
+     * @since   1.5
+     */
+    public function onDisplay($name)
+    {
+        $doc = $this->getApplication()->getDocument();
+        $doc->getWebAssetManager()
+            ->registerAndUseScript('com_content.admin-article-readmore', 'com_content/admin-article-readmore.min.js', [], ['defer' => true], ['core']);
+
+        // Pass some data to javascript
+        $doc->addScriptOptions(
+            'xtd-readmore',
+            [
+                'exists' => Text::_('PLG_READMORE_ALREADY_EXISTS', true),
+            ]
+        );
+
+        $button          = new CMSObject();
+        $button->modal   = false;
+        $button->onclick = 'insertReadmore(\'' . $name . '\');return false;';
+        $button->text    = Text::_('PLG_READMORE_BUTTON_READMORE');
+        $button->name    = $this->_type . '_' . $this->_name;
+        $button->icon    = 'arrow-down';
+        $button->iconSVG = '<svg viewBox="0 0 32 32" width="24" height="24"><path d="M32 12l-6-6-10 10-10-10-6 6 16 16z"></path></svg>';
+        $button->link    = '#';
+
+        return $button;
+    }
+}