diff --git a/_admin.php b/_admin.php
index aaa044d..6ac9601 100644
--- a/_admin.php
+++ b/_admin.php
@@ -10,99 +10,147 @@
  * @copyright Jean-Christian Denis
  * @copyright GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
  */
-if (!defined('DC_CONTEXT_ADMIN')) {
-    return null;
+declare(strict_types=1);
+
+namespace Dotclear\Plugin\tinyPacker;
+
+/* dotclear */
+use dcCore;
+use dcPage;
+
+/* clearbricks */
+use files;
+use fileZip;
+use html;
+use http;
+use path;
+
+/* php */
+use Exception;
+
+/**
+ * tinyPacker admin class
+ *
+ * Add action and button to modules lists.
+ */
+class Admin
+{
+    private static $init = false;
+
+    public static function init(): bool
+    {
+        if (defined('DC_CONTEXT_ADMIN')) {
+            dcPage::checkSuper();
+            self::$init = true;
+        }
+
+        return self::$init;
+    }
+
+    public static function process(): bool
+    {
+        if (!self::$init) {
+            return false;
+        }
+
+        dcCore::app()->addBehavior(
+            'adminModulesListGetActions',
+            function ($list, $id, $_) {
+                return in_array($list->getList(), [
+                    'plugin-activate',
+                    'theme-activate',
+                ]) ? sprintf(
+                    '<input type="submit" name="%s[%s]" value="Pack" />',
+                    basename(__DIR__),
+                    html::escapeHTML($id)
+                ) : null;
+            }
+        );
+
+        dcCore::app()->addBehavior(
+            'adminModulesListDoActions',
+            function ($list, $modules, $type) {
+                # Pack action
+                if (empty($_POST[basename(__DIR__)])
+                 || !is_array($_POST[basename(__DIR__)])) {
+                    return null;
+                }
+
+                # Repository directory
+                $dir = path::real(
+                    dcCore::app()->blog->public_path . '/packages',
+                    false
+                );
+
+                if (!is_dir($dir)) {
+                    files::makeDir($dir, true);
+                }
+                if (!is_writable($dir)) {
+                    throw new Exception(__('Destination directory is not writable.'));
+                }
+
+                # Module to pack
+                $modules = array_keys($_POST[basename(__DIR__)]);
+                $id      = $modules[0];
+
+                if (!$list->modules->moduleExists($id)) {
+                    throw new Exception(__('No such module.'));
+                }
+                $module = $list->modules->getModules($id);
+
+                # Excluded files and dirs
+                $exclude = [
+                    '\.',
+                    '\.\.',
+                    '__MACOSX',
+                    '\.svn',
+                    '\.hg.*?',
+                    '\.git.*?',
+                    'CVS',
+                    '\.directory',
+                    '\.DS_Store',
+                    'Thumbs\.db',
+                    '_disabled',
+                ];
+
+                # Packages names
+                $files = [
+                    $type . '-' . $id . '.zip',
+                    $type . '-' . $id . '-' . $module['version'] . '.zip',
+                ];
+
+                # Create zip
+                foreach ($files as $f) {
+                    @set_time_limit(300);
+                    $fp = fopen($dir . '/' . $f, 'wb');
+
+                    $zip = new fileZip($fp);
+
+                    foreach ($exclude as $e) {
+                        $zip->addExclusion(sprintf(
+                            '#(^|/)(%s)(/|$)#',
+                            $e
+                        ));
+                    }
+
+                    $zip->addDirectory($module['root'], $id, true);
+                    $zip->write();
+                    $zip->close();
+                    unset($zip);
+                }
+
+                dcPage::addSuccessNotice(
+                    __('Task successfully executed.')
+                );
+                http::redirect($list->getURL());
+            }
+        );
+
+        return true;
+    }
 }
 
-dcCore::app()->addBehavior(
-    'adminModulesListGetActions',
-    function ($list, $id, $_) {
-        return in_array($list->getList(), [
-            'plugin-activate',
-            'theme-activate',
-        ]) ? sprintf(
-            '<input type="submit" name="%s[%s]" value="Pack" />',
-            basename(__DIR__),
-            html::escapeHTML($id)
-        ) : null;
-    }
-);
-
-dcCore::app()->addBehavior(
-    'adminModulesListDoActions',
-    function ($list, $modules, $type) {
-        # Pack action
-        if (empty($_POST[basename(__DIR__)])
-         || !is_array($_POST[basename(__DIR__)])) {
-            return null;
-        }
-
-        # Repository directory
-        $dir = path::real(
-            dcCore::app()->blog->public_path . '/packages',
-            false
-        );
-
-        if (!is_dir($dir)) {
-            files::makeDir($dir, true);
-        }
-        if (!is_writable($dir)) {
-            throw new Exception(__('Destination directory is not writable.'));
-        }
-
-        # Module to pack
-        $modules = array_keys($_POST[basename(__DIR__)]);
-        $id      = $modules[0];
-
-        if (!$list->modules->moduleExists($id)) {
-            throw new Exception(__('No such module.'));
-        }
-        $module = $list->modules->getModules($id);
-
-        # Excluded files and dirs
-        $exclude = [
-            '\.',
-            '\.\.',
-            '__MACOSX',
-            '\.svn',
-            '\.hg.*?',
-            '\.git.*?',
-            'CVS',
-            '\.directory',
-            '\.DS_Store',
-            'Thumbs\.db',
-            '_disabled',
-        ];
-
-        # Packages names
-        $files = [
-            $type . '-' . $id . '.zip',
-            $type . '-' . $id . '-' . $module['version'] . '.zip',
-        ];
-
-        # Create zip
-        foreach ($files as $f) {
-            @set_time_limit(300);
-            $fp = fopen($dir . '/' . $f, 'wb');
-
-            $zip = new fileZip($fp);
-
-            foreach ($exclude as $e) {
-                $zip->addExclusion(sprintf(
-                    '#(^|/)(%s)(/|$)#',
-                    $e
-                ));
-            }
-
-            $zip->addDirectory($module['root'], $id, true);
-            $zip->write();
-            $zip->close();
-            unset($zip);
-        }
-
-        dcPage::addSuccessNotice(
-            __('Task successfully executed.')
-        );
-        http::redirect($list->getURL());
-    }
-);
+/* process */
+if (Admin::init()) {
+    Admin::process();
+}