first commit

administrator/modules/mod_version/mod_version.php

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+<?php
+
+/**
+ * @package     Joomla.Administrator
+ * @subpackage  mod_version
+ *
+ * @copyright   (C) 2012 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+\defined('_JEXEC') or die;
+
+$version = \Joomla\Module\Version\Administrator\Helper\VersionHelper::getVersion();
+
+require \Joomla\CMS\Helper\ModuleHelper::getLayoutPath('mod_version', $params->get('layout', 'default'));

administrator/modules/mod_version/mod_version.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<extension type="module" client="administrator" method="upgrade">
+	<name>mod_version</name>
+	<author>Joomla! Project</author>
+	<creationDate>2012-01</creationDate>
+	<copyright>(C) 2012 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>MOD_VERSION_XML_DESCRIPTION</description>
+	<namespace path="src">Joomla\Module\Version</namespace>
+	<files>
+		<filename module="mod_version">mod_version.php</filename>
+		<folder>src</folder>
+		<folder>tmpl</folder>
+	</files>
+	<languages>
+		<language tag="en-GB">language/en-GB/mod_version.ini</language>
+		<language tag="en-GB">language/en-GB/mod_version.sys.ini</language>
+	</languages>
+	<help key="Admin_Modules:_Joomla_Version_Information" />
+	<config>
+		<fields name="params">
+			<fieldset name="advanced">
+				<field
+					name="layout"
+					type="modulelayout"
+					label="JFIELD_ALT_LAYOUT_LABEL"
+					class="form-select"
+					validate="moduleLayout"
+				/>
+
+				<field
+					name="moduleclass_sfx"
+					type="textarea"
+					label="COM_MODULES_FIELD_MODULECLASS_SFX_LABEL"
+					rows="3"
+					validate="CssIdentifier"
+				/>
+			</fieldset>
+		</fields>
+	</config>
+</extension>

administrator/modules/mod_version/src/Helper/VersionHelper.php

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+<?php
+
+/**
+ * @package     Joomla.Administrator
+ * @subpackage  mod_version
+ *
+ * @copyright   (C) 2012 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+namespace Joomla\Module\Version\Administrator\Helper;
+
+use Joomla\CMS\Version;
+
+// phpcs:disable PSR1.Files.SideEffects
+\defined('_JEXEC') or die;
+// phpcs:enable PSR1.Files.SideEffects
+
+/**
+ * Helper for mod_version
+ *
+ * @since  1.6
+ */
+abstract class VersionHelper
+{
+    /**
+     * Get the Joomla version number.
+     *
+     * @return  string  String containing the current Joomla version.
+     */
+    public static function getVersion()
+    {
+        $version = new Version();
+
+        return '&#x200E;' . $version->getShortVersion();
+    }
+}

administrator/modules/mod_version/tmpl/default.php

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+<?php
+
+/**
+ * @package     Joomla.Administrator
+ * @subpackage  mod_version
+ *
+ * @copyright   (C) 2012 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\Language\Text;
+
+?>
+<div class="header-item-content joomlaversion">
+    <div class="header-item-text no-link">
+        <span class="icon-joomla" aria-hidden="true"></span>
+        <span class="visually-hidden"><?php echo Text::sprintf('MOD_VERSION_CURRENT_VERSION_TEXT', $version); ?></span>
+        <span aria-hidden="true"><?php echo $version; ?></span>
+    </div>
+</div>