source: extensions/add_index/main.admin.inc.php

<?php
// +-----------------------------------------------------------------------+
// | Add Index - a Piwigo Plugin                                           |
// | Copyright (C) 2019-2011 Piwigo team                                   |
// +-----------------------------------------------------------------------+
// | This program is free software; you can redistribute it and/or modify  |
// | it under the terms of the GNU General Public License as published by  |
// | the Free Software Foundation                                          |
// |                                                                       |
// | This program is distributed in the hope that it will be useful, but   |
// | WITHOUT ANY WARRANTY; without even the implied warranty of            |
// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      |
// | General Public License for more details.                              |
// |                                                                       |
// | You should have received a copy of the GNU General Public License     |
// | along with this program; if not, write to the Free Software           |
// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
// | USA.                                                                  |
// +-----------------------------------------------------------------------+

if ((!defined('PHPWG_ROOT_PATH')) or (!(defined('IN_ADMIN') and IN_ADMIN)))
{
  die('Hacking attempt!');
}

add_event_handler('loc_begin_admin', 'plugAIPf');
function plugAIPf(){
  global $template;
  $admin_base_url = $_SERVER['REQUEST_URI'];
  $template->set_prefilter('maintenance', 'plugAIPT');
  $template->assign(
    array(
                'U_ADDINDEX' => get_admin_plugin_menu_link(dirname(__FILE__).'/admin/main_page.php').'&amp;overwrite&amp;pwg_token='.get_pwg_token(),
                'U_AIreturnmaintenance' => get_root_url().'admin.php?page=maintenance',
                
  ));
}

function plugAIPT($content){
  // add js link
  $search = '{/footer_script}';
  $replace = '
  $(".addindex-level-button").each(function() {
  const title = \'{"Advanced_Add_Index"|@translate|@escape:\'javascript\'}\';
  $(this).pwg_jconfirm_follow_href({
    alert_title: title,
    alert_confirm: confirm_msg,
    alert_cancel: cancel_msg
  });
});
  ';
  $content = str_replace($search, $replace.$search, $content);
        
  //add action  
  $search = '<a href="{$U_MAINT_C13Y}" class="icon-ok maintenance-action">{\'Reinitialize check integrity\'|@translate}</a>';
  $replacement = '<a href="{$U_ADDINDEX}" class="icon-plus maintenance-action addindex-level-button" >{\'Advanced_Add_Index\'|@translate}</a>';
  return str_replace($search, $search.$replacement, $content);
}

class AdminAddIndex extends AddIndex
{
  function load_params()
  {
    global $conf;

    // Name of index file (index.php or index.htm or index.html)
    if (!isset($conf['add_index_filename']))
    {
      $conf['add_index_filename'] = 'index.php';
    }
    // Name of index file (index.php or index.htm or index.html)
    if (!isset($conf['add_index_source_directory_path']))
    {
      // Name of the directoty use in order to copy index file
      $conf['add_index_source_directory_path'] = PHPWG_ROOT_PATH.'include/';
    }
  }

  function loading_lang()
  {
    load_language('plugin.lang', $this->path);
  }

  function get_admin_advanced_features_links($advanced_features)
  {
    array_push($advanced_features,
      array
      (
        'CAPTION' => l10n('Advanced_Add_Index'),
        'URL' => get_admin_plugin_menu_link(dirname(__FILE__).'/admin/main_page.php').'&amp;overwrite'
      ));

    return $advanced_features;
  }

  function get_admins_site_links($site_manager_plugin_links, $site_id, $is_remote)
  {
    if (!$is_remote)
    {
      array_push($site_manager_plugin_links,
        array
        (
          'U_HREF' => get_admin_plugin_menu_link(dirname(__FILE__).'/admin/main_page.php').'&amp;site_id='.$site_id,
          'U_CAPTION' => l10n('Manager_Add_Index'),
          'U_HINT' => l10n('Add_Index')
        ));
    }

    return $site_manager_plugin_links;
  }
}

// Create object
$add_index = new AdminAddIndex();

// Load Add Index parameters
$add_index->load_params();

// Add events
add_event_handler('loading_lang', array(&$add_index, 'loading_lang'));
add_event_handler('get_admin_advanced_features_links', array(&$add_index, 'get_admin_advanced_features_links'));
add_event_handler('get_admins_site_links', array(&$add_index, 'get_admins_site_links'), EVENT_HANDLER_PRIORITY_NEUTRAL, 3);

?>