system.module 53.9 KB
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<?php
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// $Id$
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/**
 * @file
 * Configuration system that lets administrators modify the workings of the site.
 */

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/**
 * Implementation of hook_help().
 */
function system_help($section) {
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  switch ($section) {
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    case 'admin/help#system':
      $output = '<p>'. t('The system module provides system-wide defaults such as running jobs at a particular time, and storing web pages to improve efficiency.   The ability to run scheduled jobs makes administering the web site more usable, as administrators do not have to manually start jobs.   The storing of web pages, or caching, allows the site to efficiently re-use web pages and improve web site performance.  The settings module provides control over preferences, behaviours including visual and operational settings.') .'</p>';
      $output .= '<p>'. t('Some modules require regularly scheduled actions, such as cleaning up logfiles. Cron, which stands for chronograph, is a periodic command scheduler executing commands at intervals specified in seconds. It can be used to control the execution of daily, weekly and monthly jobs (or anything with a period measured in seconds). The aggregator module periodically updates feeds using cron.  Ping periodically notifies services of new content on your site.  Search periodically indexes the content on your site.   Automating tasks is one of the best ways to keep a system running smoothly, and if most of your administration does not require your direct involvement, cron is an ideal solution.') .'</p>';
      $output .= '<p>'. t('There is a caching mechanism which stores dynamically generated web pages in a database. By caching a web page, the system module does not have to create the page each time someone wants to view it, instead it takes only one SQL query to display it, reducing response time and the server\'s load. Only pages requested by <em>anonymous</em> users are cached. In order to reduce server load and save bandwidth, the system module stores and sends cached pages compressed.') .'</p>';
      $output .= t('<p>You can</p>
<ul>
<li>activate your cron job on the cron page <a href="%file-cron">cron.php</a>.</li>
<li>read how to <a href="%external-http-drupal-org-node-23714">configure cron jobs</a>.</li>
<li>administer cache settings in <a href="%admin-settings">administer &gt;&gt; settings</a>.</li>
</ul>
', array('%file-cron' => 'cron.php', '%external-http-drupal-org-node-23714' => 'http://drupal.org/node/23714', '%admin-settings' => url('admin/settings')));
      $output .= '<p>'. t('For more information please read the configuration and customization handbook <a href="%system">System page</a>.', array('%system' => 'http://www.drupal.org/handbook/modules/system/')) .'</p>';
      return $output;
    case 'admin/modules#description':
      return t('Handles general site configuration for administrators.');
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    case 'admin':
      return t('<p>Welcome to the administration section. Below are the most recent system events.</p>');
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    case 'admin/settings':
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      return t('<p>General configuration options for your site. Set up the name of the site, e-mail address used in mail-outs, clean URL options, caching, etc.</p>');
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    case 'admin/themes':
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      return t('<p>Select which themes are available to your users and specify the default theme. To configure site-wide display settings, click the "configure" task above. Alternately, to override these settings in a specific theme, click the "configure" link for the corresponding theme.  Note that different themes may have different regions available for rendering content like blocks.  If you want consistency in what your users see, you may wish to enable only one theme.</p>');
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    case 'admin/themes/settings':
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      return t('<p>These options control the default display settings for your entire site, across all themes. Unless they have been overridden by a specific theme, these settings will be used.</p>');
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    case 'admin/themes/settings/'. arg(3):
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      $reference = explode('.', arg(3), 2);
      $theme = array_pop($reference);
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      return t('<p>These options control the display settings for the <code>%template</code> theme. When your site is displayed using this theme, these settings will be used. By clicking "Reset to defaults," you can choose to use the <a href="%global">global settings</a> for this theme.</p>', array('%template' => $theme, '%global' => url('admin/themes/settings')));
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    case 'admin/modules':
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      return t('<p>Modules are plugins for Drupal that extend its core functionality. Here you can select which modules are enabled. Click on the name of the module in the navigation menu for their individual configuration pages. Once a module is enabled, new <a href="%permissions">permissions</a> might be made available. Modules can automatically be temporarily disabled to reduce server load when your site becomes extremely busy by enabling the throttle.module and checking throttle. The auto-throttle functionality must be enabled on the <a href="%throttle">throttle configuration page</a> after having enabled the throttle module.</p>', array('%permissions' => url('admin/access/permissions'), '%throttle' => url('admin/settings/throttle')));
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  }
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}

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/**
 * Implementation of hook_perm().
 */
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function system_perm() {
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  return array('administer site configuration', 'access administration pages', 'bypass input data check');
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}

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/**
 * Implementation of hook_elements().
 */
function system_elements() {
  // Top level form
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  $type['form'] = array('#method' => 'post', '#action' => request_uri());
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  // Inputs
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  $type['checkbox'] = array('#input' => TRUE, '#return_value' => 1);
  $type['submit'] = array('#input' => TRUE, '#name' => 'op', '#button_type' => 'submit', '#execute' => TRUE);
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  $type['button'] = array('#input' => TRUE, '#name' => 'op', '#button_type' => 'submit', '#execute' => FALSE);
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  $type['textfield'] = array('#input' => TRUE, '#size' => 60, '#maxlength' => 128, '#autocomplete_path' => FALSE);
  $type['password'] = array('#input' => TRUE, '#size' => 30, '#maxlength' => 64);
  $type['textarea'] = array('#input' => TRUE, '#cols' => 60, '#rows' => 5);
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  $type['radios'] = array('#input' => TRUE, '#process' => 'expand_radios');
  $type['radio'] = array('#input' => TRUE);
  $type['checkboxes'] = array('#input' => TRUE, '#process' => 'expand_checkboxes', '#tree' => TRUE);
  $type['select'] = array('#input' => TRUE);
  $type['weight'] = array('#input' => TRUE, '#delta' => 10);
  $type['date'] = array('#input' => TRUE, '#process' => 'expand_date');
  $type['file'] = array('#input' => TRUE, '#size' => 60);
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  // Form structure
  $type['item'] = array();
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  $type['hidden'] = array('#input' => TRUE);
  $type['value'] = array('#input' => TRUE);
  $type['markup'] = array('#prefix' => '', '#suffix' => '');
  $type['fieldset'] = array('#collapsible' => FALSE, '#collapsed' => FALSE);
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  return $type;
}

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/**
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 * Implementation of hook_menu().
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 */
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function system_menu($may_cache) {
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  $items = array();
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  if ($may_cache) {
    $items[] = array('path' => 'system/files', 'title' => t('file download'),
      'callback' => 'file_download',
      'access' => TRUE,
      'type' => MENU_CALLBACK);

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    // Clean URL tester
    $items[] = array('path' => 'system/test',
      'callback' => 'system_test',
      'access' => TRUE,
      'type' => MENU_CALLBACK);

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    $access = user_access('administer site configuration');

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    $items[] = array('path' => 'admin', 'title' => t('administer'),
      'access' => user_access('access administration pages'),
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      'callback' => 'watchdog_overview',
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      'weight' => 9);

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    // Themes:
    $items[] = array('path' => 'admin/themes', 'title' => t('themes'),
      'callback' => 'system_themes', 'access' => $access);

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    $items[] = array('path' => 'admin/themes/select', 'title' => t('list'),
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      'callback' => 'system_themes', 'access' => $access,
      'type' => MENU_DEFAULT_LOCAL_TASK, 'weight' => -1);

    $items[] = array('path' => 'admin/themes/settings', 'title' => t('configure'),
      'callback' => 'system_theme_settings', 'access' => $access,
      'type' => MENU_LOCAL_TASK);

    // Theme configuration subtabs
    $items[] = array('path' => 'admin/themes/settings/global', 'title' => t('global settings'),
      'callback' => 'system_theme_settings', 'access' => $access,
      'type' => MENU_DEFAULT_LOCAL_TASK, 'weight' => -1);

    foreach (list_themes() as $theme) {
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       $items[] = array('path' => 'admin/themes/settings/'. $theme->name, 'title' => $theme->name,
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       'callback' => 'system_theme_settings', 'callback arguments' => array($theme->name), 'access' => $access,
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       'type' => MENU_LOCAL_TASK);
    }

    // Modules:
    $items[] = array('path' => 'admin/settings', 'title' => t('settings'),
      'callback' => 'system_site_settings', 'access' => $access);
    foreach (module_list() as $name) {
      if (module_hook($name, 'settings')) {
        $items[] = array('path' => 'admin/settings/'. $name, 'title' => t($name));
      }
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    }
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    $items[] = array('path' => 'admin/modules', 'title' => t('modules'),
      'callback' => 'system_modules', 'access' => $access);
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  }
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  return $items;
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}

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/**
 * Menu callback: dummy clean URL tester.
 */
function system_test() {
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  variable_set('clean_url_ok', 1);
  exit;
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}

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/**
 * Implementation of hook_user().
 *
 * Allows users to individually set their theme and time zone.
 */
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function system_user($type, $edit, &$user, $category = NULL) {
  if ($type == 'form' && $category == 'account') {
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    $themes = list_themes();
    ksort($themes);
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    // Reset to follow site default theme if user selects the site default
    if ($key == variable_get('theme_default', 'bluemarine')) {
      $key = '';
      if ($edit['theme'] == variable_get('theme_default', 'bluemarine')) {
        $edit['theme'] = '';
      }
    }
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    $form['themes'] = array(
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      '#type' => 'fieldset', '#title' => t('Theme configuration'), '#description' => t('Selecting a different theme will change the look and feel of the site.'), '#weight' => 2, '#collapsible' => TRUE, '#theme' => 'system_user');
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    foreach ($themes as $info) {
      $info->screenshot = dirname($info->filename) . '/screenshot.png';
      $screenshot = file_exists($info->screenshot) ? theme('image', $info->screenshot, t('Screenshot for %theme theme', array('%theme' => $info->name)), '', array('class' => 'screenshot'), false) : t('no screenshot');
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      $form['themes'][$info->name]['screenshot'] = array('#type' => 'markup', '#value' => $screenshot);
      $form['themes'][$info->name]['description'] = array('#type' => 'item', '#title' => $info->name,  '#value' => dirname($info->filename));
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      $options[$info->name] = '';
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    }
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    $form['themes']['theme'] = array('#type' => 'radios', '#options' => $options, '#default_value' => $edit['theme'] ? $edit['theme'] : variable_get('theme_default', 'bluemarine'));
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    if (variable_get('configurable_timezones', 1)) {
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      $zones = _system_zonelist();
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      $form['locale'] = array('#type'=>'item', '#title' => t('Locale settings'), '#weight' => 6);
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      $form['locale']['timezone'] = array(
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        '#type' => 'select', '#title' => t('Time zone'), '#default_value' => strlen($edit['timezone']) ? $edit['timezone'] : variable_get('date_default_timezone', 0),
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        '#options' => $zones, '#description' => t('Select your current local time. Dates and times throughout this site will be displayed using this time zone.')
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      );
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    }
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    return $form;
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  }
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}

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function theme_system_user($form) {
  foreach (element_children($form) as $key) {
    $row = array();
    if (is_array($form[$key]['description'])) {
      $row[] = form_render($form[$key]['screenshot']);
      $row[] = form_render($form[$key]['description']);
      $row[] = form_render($form['theme'][$key]);
    }
    $rows[] = $row;
  }

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  $header = array(t('Screenshot'), t('Name'), t('Selected'));
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  $output = theme('table', $header, $rows);
  return $output;
}

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function _system_zonelist() {
  $timestamp = time();
  $zonelist = array(-11, -10, -9.5, -9, -8, -7, -6, -5, -4, -3.5, -3, -2, -1, 0, 1, 2, 3, 3.5, 4, 5, 5.5, 5.75, 6, 6.5, 7, 8, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.75, 13, 14);
  $zones = array();
  foreach ($zonelist as $offset) {
    $zone = $offset * 3600;
    $zones[$zone] = format_date($timestamp, 'custom', variable_get('date_format_long', 'l, F j, Y - H:i') . ' O', $zone);
  }
  return $zones;
}

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function system_view_general() {
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  // General settings:
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  $form['general'] = array(
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    '#type' => 'fieldset', '#title' => t('General settings'),
    '#collapsible' => TRUE, '#collapsed' => TRUE
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  );
  $form['general']['site_name'] = array(
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    '#type' => 'textfield', '#title' => t('Name'), '#default_value' => variable_get('site_name', 'drupal'),
    '#description' => t('The name of this web site.')
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  );
  $form['general']['site_mail'] = array(
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    '#type' => 'textfield', '#title' => t('E-mail address'), '#default_value' => variable_get('site_mail', ini_get('sendmail_from')),
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    '#description' => t('A valid e-mail address for this website, used by the auto-mailer during registration, new password requests, notifications, etc.')
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  );
  $form['general']['site_slogan'] = array(
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    '#type' => 'textfield', '#title' => t('Slogan'), '#default_value' => variable_get('site_slogan', ''),
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    '#description' => t('The slogan of this website. Some themes display a slogan when available.')
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  );

  $form['general']['site_mission'] = array(
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    '#type' => 'textarea', '#title' => t('Mission'), '#default_value' => variable_get('site_mission', ''),
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    '#description' => t('Your site\'s mission statement or focus.')
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  );
  $form['general']['site_footer'] = array(
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    '#type' => 'textarea', '#title' => t('Footer message'), '#default_value' => variable_get('site_footer', ''),
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    '#description' => t('This text will be displayed at the bottom of each page.  Useful for adding a copyright notice to your pages.')
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  );
  $form['general']['anonymous'] = array(
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    '#type' => 'textfield', '#title' => t('Anonymous user'), '#default_value' => variable_get('anonymous', 'Anonymous'),
    '#description' => t('The name used to indicate anonymous users.')
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  );
  $form['general']['site_frontpage'] = array(
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    '#type' => 'textfield', '#title' => t('Default front page'), '#default_value' => variable_get('site_frontpage', 'node'),
    '#description' => t('The home page displays content from this relative URL.  If you are not using clean URLs, specify the part after "?q=".  If unsure, specify "node".')
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  );
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  // We check for clean URL support using an image on the client side.
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  $form['general']['clean_url'] = array(
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    '#type' => 'radios', '#title' => t('Clean URLs'), '#default_value' => variable_get('clean_url', 0), '#options' => array(t('Disabled'), t('Enabled')),
    '#description' => t('This option makes Drupal emit clean URLs (i.e. without <code>?q=</code> in the URL). You\'ll need <code>ModRewrite</code> support for this to work. See the <code>.htaccess</code> file in Drupal\'s top-level directory for more information.')
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  );

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  variable_set('clean_url_ok', 0);
  global $base_url;
  // We will use a random URL so there is no way a proxy or a browser could cache the "no such image" answer.
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  $form['general']['clean_url_test'] = array('#type' => 'markup', '#value' => '<img style="position: relative; left: -1000em;" src="'. $base_url. '/system/test/'. user_password(20) .'.png" alt="" />');
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  // Error handling:
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  $form['errors'] = array( '#type' => 'fieldset', '#title' =>t('Error handling'), '#collapsible' => TRUE, '#collapsed' => TRUE );
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  $form['errors']['site_403'] = array(
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    '#type' => 'textfield', '#title' => t('Default 403 (access denied) page'), '#default_value' => variable_get('site_403', ''),
    '#description' => t('This page is displayed when the requested document is denied to the current user.  If you are not using clean URLs, specify the part after "?q=". If unsure, specify nothing.')
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  );

  $form['errors']['site_404'] = array(
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    '#type' => 'textfield', '#title' => t('Default 404 (not found) page'), '#default_value' =>  variable_get('site_404', ''),
    '#description' => t('This page is displayed when no other content matches the requested document.  If you are not using clean URLs, specify the part after "?q=". If unsure, specify nothing.')
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  );

  $form['errors']['error_level'] = array(
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    '#type' => 'select', '#title' => t('Error reporting'), '#default_value' => variable_get('error_level', 1),
    '#options' => array(t('Write errors to the log'), t('Write errors to the log and to the screen')),
    '#description' =>  t('Where Drupal, PHP and SQL errors are logged. On a production server it is recommended that errors are only written to the error log. On a test server it can be helpful to write logs to the screen.')
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  );

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  $period = drupal_map_assoc(array(3600, 10800, 21600, 32400, 43200, 86400, 172800, 259200, 604800, 1209600, 2419200), 'format_interval');
  $period['1000000000'] = t('Never');
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  $form['errors']['watchdog_clear'] = array(
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    '#type' => 'select', '#title' => t('Discard log entries older than'), '#default_value' => variable_get('watchdog_clear', 604800), '#options' => $period,
    '#description' => t('The time log entries should be kept.  Older entries will be automatically discarded.  Requires crontab.')
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  );
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  // Caching:
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  $form['cache'] = array('#type' => 'fieldset', '#title' => t('Cache settings'), '#collapsible' => TRUE, '#collapsed' => TRUE);
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  $form['cache']['cache']  = array(
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    '#type' => 'radios',  '#title' => t('Page cache'), '#default_value' => variable_get('cache', CACHE_DISABLED),
    '#options' => array(CACHE_DISABLED => t('Disabled'), CACHE_ENABLED => t('Enabled')),
    '#description' => t("Drupal has a caching mechanism which stores dynamically generated web pages in a database.  By caching a web page, Drupal does not have to create the page each time someone wants to view it, instead it takes only one SQL query to display it, reducing response time and the server's load.  Only pages requested by \"anonymous\" users are cached.  In order to reduce server load and save bandwidth, Drupal stores and sends compressed cached pages.")
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  );

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  $period = drupal_map_assoc(array(0, 60, 180, 300, 600, 900, 1800, 2700, 3600, 10800, 21600, 32400, 43200, 86400), 'format_interval');
  $period[0] = t('none');
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  $form['cache']['cache_lifetime'] = array(
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    '#type' => 'select', '#title' => t('Minimum cache lifetime'), '#default_value' => variable_get('cache_lifetime', 0), '#options' => $period,
    '#description' => t('Enabling the cache will offer a sufficient performance boost for most low-traffic and medium-traffic sites.  On high-traffic sites it can become necessary to enforce a minimum cache lifetime.  The minimum cache lifetime is the minimum amount of time that will go by before the cache is emptied and recreated.  A larger minimum cache lifetime offers better performance, but users will not see new content for a longer period of time.')
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  );
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  // File system:
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  $form['files'] = array('#type' => 'fieldset', '#title' => t('File system settings'), '#collapsible' => TRUE, '#collapsed' => TRUE);
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  $form['files']['file_directory_path'] = array(
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    '#type' => 'textfield',
    '#title' => t('File system path'),
    '#default_value' => file_directory_path(),
    '#maxlength' => 255,
    '#description' => t('A file system path where the files will be stored. This directory has to exist and be writable by Drupal. If the download method is set to public this directory has to be relative to Drupal installation directory, and be accessible over the web. When download method is set to private this directory should not be accessible over the web. Changing this location after the site has been in use will cause problems so only change this setting on an existing site if you know what you are doing.'),
    '#post_process' => 'system_check_directory',
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  );

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  $form['files']['file_directory_temp'] = array(
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    '#type' => 'textfield',
    '#title' => t('Temporary directory'),
    '#default_value' => file_directory_temp(),
    '#maxlength' => 255,
    '#description' => t('Location where uploaded files will be kept during previews. Relative paths will be resolved relative to the Drupal installation directory.'),
    '#post_process' => 'system_check_directory',
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  );

  $form['files']['file_downloads'] = array(
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    '#type' => 'radios', '#title' => t('Download method'), '#default_value' => variable_get('file_downloads', FILE_DOWNLOADS_PUBLIC),
    '#options' => array(FILE_DOWNLOADS_PUBLIC => t('Public - files are available using http directly.'), FILE_DOWNLOADS_PRIVATE => t('Private - files are transferred by Drupal.')),
    '#description' => t('If you want any sort of access control on the downloading of files, this needs to be set to <em>private</em>. You can change this at any time, however all download URLs will change and there may be unexpected problems so it is not recommended.')
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  );
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  /*
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  // Image handling:
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  $group = array();
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  $toolkits_available = image_get_available_toolkits();
  if (count($toolkits_available) > 1) {
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    $group['image_toolkit'] = array(
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      '#type' => 'radios', '#title' => t('Select an image processing toolkit'),
      '#default_value' => variable_get('image_toolkit', image_get_toolkit()), '#options' => $toolkits_available
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    );
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  }
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  $group['toolkit'] = image_toolkit_invoke('settings');
  if (is_array($group)) {
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    $form['image'] = array('#type' => 'fieldset', '#title' => t('Image handling'), '#collapsible' => TRUE, '#collapsed' => true);
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    $form['image'] = array_merge($form['image'], $group);
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  }
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  */
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  // Feed settings
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  $form['feed'] = array('#type' => 'fieldset', '#title' => t('RSS feed settings'), '#collapsible' => TRUE, '#collapsed' => TRUE);
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  $form['feed']['feed_default_items'] = array(
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    '#type' => 'select', '#title' => t('Number of items per feed'), '#default_value' => variable_get('feed_default_items', 10),
    '#options' => drupal_map_assoc(array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30)),
    '#description' => t('The default number of items to include in a feed.')
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  );
  $form['feed']['feed_item_length'] = array(
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    '#type' => 'select', '#title' => t('Display of XML feed items'), '#default_value' => variable_get('feed_item_length','teaser'),
    '#options' => array('title' => t('Titles only'), 'teaser' => t('Titles plus teaser'), 'fulltext' => t('Full text')),
    '#description' => t('Global setting for the length of XML feed items that are output by default.')
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  );
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  // Date settings:
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  $zones = _system_zonelist();
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  // Date settings: possible date formats
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  $dateshort = array('Y-m-d H:i','m/d/Y - H:i', 'd/m/Y - H:i', 'Y/m/d - H:i',
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           'm/d/Y - g:ia', 'd/m/Y - g:ia', 'Y/m/d - g:ia',
           'M j Y - H:i', 'j M Y - H:i', 'Y M j - H:i',
           'M j Y - g:ia', 'j M Y - g:ia', 'Y M j - g:ia');
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  $datemedium = array('D, Y-m-d H:i', 'D, m/d/Y - H:i', 'D, d/m/Y - H:i',
          'D, Y/m/d - H:i', 'F j, Y - H:i', 'j F, Y - H:i', 'Y, F j - H:i',
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          'D, m/d/Y - g:ia', 'D, d/m/Y - g:ia', 'D, Y/m/d - g:ia',
          'F j, Y - g:ia', 'j F, Y - g:ia', 'Y, F j - g:ia');
  $datelong = array('l, F j, Y - H:i', 'l, j F, Y - H:i', 'l, Y,  F j - H:i',
        'l, F j, Y - g:ia', 'l, j F, Y - g:ia', 'l, Y,  F j - g:ia');
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  // Date settings: construct choices for user
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  foreach ($dateshort as $f) {
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    $dateshortchoices[$f] = format_date(time(), 'custom', $f);
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  }
  foreach ($datemedium as $f) {
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    $datemediumchoices[$f] = format_date(time(), 'custom', $f);
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  }
  foreach ($datelong as $f) {
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    $datelongchoices[$f] = format_date(time(), 'custom', $f);
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  }

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  $form['dates'] = array('#type' => 'fieldset', '#title' => t('Date settings'), '#collapsible' => TRUE, '#collapsed' => TRUE);
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  $form['dates']['date_default_timezone'] = array(
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    '#type' => 'select', '#title' => t('Default time zone'), '#default_value' => variable_get('date_default_timezone', 0),
    '#options' => $zones, '#description' => t('Select the default site time zone.')
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  );

  $form['dates']['configurable_timezones'] = array(
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    '#type' => 'radios', '#title' => t('Configurable time zones'), '#default_value' => variable_get('configurable_timezones', 1), '#options' => array(t('Disabled'), t('Enabled')),
    '#description' => t('Enable or disable user-configurable time zones.  When enabled, users can set their own time zone and dates will be updated accordingly.')
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  );

  $form['dates']['date_format_short'] = array(
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    '#type' => 'select', '#title' => t('Short date format'), '#default_value' => variable_get('date_format_short', $dateshort[0]),
    '#options' => $dateshortchoices,  '#description' => t('The short format of date display.')
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  );

  $form['dates']['date_format_medium'] = array(
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    '#type' => 'select', '#title' => t('Medium date format'), '#default_value' => variable_get('date_format_medium', $datemedium[0]),
    '#options' => $datemediumchoices, '#description' => t('The medium sized date display.')
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  );

  $form['dates']['date_format_long'] = array(
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    '#type' => 'select', '#title' => t('Long date format'), '#default_value' => variable_get('date_format_long', $datelong[0]),
    '#options' => $datelongchoices, '#description' => t('Longer date format used for detailed display.')
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  );

  $form['dates']['date_first_day'] = array(
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    '#type' => 'select', '#title' => t('First day of week'), '#default_value' => variable_get('date_first_day', 0),
    '#options' => array(0 => t('Sunday'), 1 => t('Monday'), 2 => t('Tuesday'), 3 => t('Wednesday'), 4 => t('Thursday'), 5 => t('Friday'), 6 => t('Saturday')),
    '#description' => t('The first day of the week for calendar views.')
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  );
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  // Site offline/maintenance settings
  $form['site_status'] = array(
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    '#type' => 'fieldset',
    '#title' => t('Site maintenance'),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE);
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  $form['site_status']['site_offline'] = array(
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    '#type' => 'radios',
    '#title' => t('Site status'),
    '#default_value' => variable_get('site_offline', 0),
    '#options' => array(t('Online'), t('Offline')),
    '#description' => t('When set to "Online", all visitors will be able to browse your site normally. When set to "Offline", only users with the "administer site configuration" permission will be able to access your site to perform maintenance, all other visitors will see the site offline message configured below.')
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  );

  $form['site_status']['site_offline_message'] = array(
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    '#type' => 'textarea',
    '#title' => t('Site offline message'),
    '#default_value' => variable_get('site_offline_message', t('%site is currently under maintenance. We should be back shortly. Thank you for your patience.', array('%site' => variable_get('site_name', t('This drupal site'))))),
    '#description' => t('Message to show visitors when site is offline.')
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  );

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  // String handling: report status and errors.
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  $form['strings'] = array('#type' => 'fieldset', '#title' => t('String handling'), '#collapsible' => TRUE, '#collapsed' => TRUE);
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  $form['strings'] = array_merge($form['strings'], unicode_settings());
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  return $form;
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}

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/**
 * Checks the existence of the directory specified in $form_element. This
 * function is called from the system_view_general form to check both the
 * file_directory_path and file_directory_temp directories. If validation
 * fails, the form element is flagged with an error from within the
 * file_check_directory function.
 *
 * @param $form_id
 *   The id of the form.
 * @param $form_element
 *   The form element containing the name of the directory to check.
 */
function system_check_directory($form_id, $form_element) {
  file_check_directory($form_element['#value'], FILE_CREATE_DIRECTORY, $form_element['#parents'][0]);
  return $form_element;
}

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/**
 * Retrieves the current status of an array of files in the system table.
 */
function system_get_files_database(&$files, $type) {
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  // Extract current files from database.
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  $result = db_query("SELECT name, type, status, throttle FROM {system} WHERE type = '%s'", $type);
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  while ($file = db_fetch_object($result)) {
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    if (isset($files[$file->name]) && is_object($files[$file->name])) {
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      foreach ($file as $key => $value) {
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        if (!isset($files[$file->name]) || !isset($files[$file->name]->$key)) {
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          $files[$file->name]->$key = $value;
        }
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      }
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    }
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  }
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}
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/**
 * Collect data about all currently available themes
 */
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function system_theme_data() {
  // Find themes
  $themes = system_listing('\.theme$', 'themes');

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  // Find theme engines
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  $engines = system_listing('\.engine$', 'themes/engines');

  // can't iterate over array itself as it uses a copy of the array items
  foreach (array_keys($themes) as $key) {
    drupal_get_filename('theme', $themes[$key]->name, $themes[$key]->filename);
    drupal_load('theme', $themes[$key]->name);
    $themes[$key]->owner = $themes[$key]->filename;
    $themes[$key]->prefix = $key;
  }
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  // Remove all theme engines from the system table
  db_query("DELETE FROM {system} WHERE type = 'theme_engine'");
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  foreach ($engines as $engine) {
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    // Insert theme engine into system table
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    drupal_get_filename('theme_engine', $engine->name, $engine->filename);
    drupal_load('theme_engine', $engine->name);
    db_query("INSERT INTO {system} (name, type, filename, status, throttle, bootstrap) VALUES ('%s', '%s', '%s', %d, %d, %d)", $engine->name, 'theme_engine', $engine->filename, 1, 0, 0);

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    // Add templates to the site listing
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    foreach (call_user_func($engine->name . '_templates') as $template) {
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      // Do not double-insert templates with theme files in their directory,
      // but do register their engine data.
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      if (array_key_exists($template->name, $themes)) {
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        $themes[$template->name]->template = TRUE;
        $themes[$template->name]->owner = $engine->filename;
        $themes[$template->name]->prefix = $engine->name;
      }
      else {
        $template->template = TRUE;
        $template->name = basename(dirname($template->filename));
        $template->owner = $engine->filename;
        $template->prefix = $engine->name;

        $themes[$template->name] = $template;
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      }
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    }
  }

  // Find styles in each theme's directory.
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  foreach ($themes as $theme) {
    foreach (file_scan_directory(dirname($theme->filename), 'style.css$') as $style) {
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      $style->style = TRUE;
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      $style->template = isset($theme->template) ? $theme->template : FALSE;
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      $style->name = basename(dirname($style->filename));
      $style->owner = $theme->filename;
      $style->prefix = $theme->template ? $theme->prefix : $theme->name;
      // do not double-insert styles with theme files in their directory
      if (array_key_exists($style->name, $themes)) {
        continue;
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      }
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      $themes[$style->name] = $style;
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    }
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  }
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  // Extract current files from database.
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  system_get_files_database($themes, 'theme');

  db_query("DELETE FROM {system} WHERE type = 'theme'");
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  foreach ($themes as $theme) {
    db_query("INSERT INTO {system} (name, description, type, filename, status, throttle, bootstrap) VALUES ('%s', '%s', '%s', '%s', %d, %d, %d)", $theme->name, $theme->owner, 'theme', $theme->filename, $theme->status, 0, 0);
  }

  return $themes;
}

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/**
 * Get a list of available regions from a specified theme.
 *
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 * @param $theme_key
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 *   The name of a theme.
 * @return
 *   An array of regions in the form $region['name'] = 'description'.
 */
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function system_region_list($theme_key) {
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  static $list = array();

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  if (!array_key_exists($theme_key, $list)) {
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    $result = db_query("SELECT * FROM {system} WHERE type = 'theme' AND name = '%s'", $theme_key);
    $theme = db_fetch_object($result);
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    if (strpos($theme->filename, '.css')) {
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      // File is a style, which can't have its own regions; use its theme instead.
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      $list[$theme_key] = system_region_list(basename(dirname($theme->description)));
      return $list[$theme_key];
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    }
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    if (file_exists($file = dirname($theme->filename) .'/' . $theme_key . '.theme')) {
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    include_once "./$file";
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    }

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    $regions = function_exists($theme_key . '_regions') ? call_user_func($theme_key . '_regions') : array();
    if (strpos($theme->description, '.engine')) {
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      // File is a template; include its engine's regions.
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    include_once './' . $theme->description;
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      $theme_engine = basename($theme->description, '.engine');
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      $engine_regions = function_exists($theme_engine . '_regions') ? call_user_func($theme_engine . '_regions') : array();
      $regions = array_merge($engine_regions, $regions);
    }

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    $list[$theme_key] = $regions;
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  }

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  return $list[$theme_key];
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}

/**
 * Get the name of the default region for a given theme.
 *
 * @param $theme
 *   The name of a theme.
 * @return
 *   A string that is the region name.
 */
function system_default_region($theme) {
  $regions = array_keys(system_region_list($theme));
  return $regions[0];
}

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/**
 * Returns an array of files objects of the given type from both the
 * site-wide directory (i.e. modules/) and site-specific directory
 * (i.e. sites/somesite/modules/).  The returned array will be keyed
 * using the key specified (name, basename, filename).  Using name or
 * basename will cause site-specific files to shadow files in the
 * default directories.  That is, if a file with the same name appears
 * in both location, only the site-specific version will be included.
 *
 * @param $mask
 *   The regular expression of the files to find.
 * @param $directory
 *   The subdirectory name in which the files are found.  For example,
 *   'modules' will search in both modules/ and
 *   sites/somesite/modules/.
 * @param $key
 *   The key to be passed to file_scan_directory().
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 * @param $min_depth
 *   Minimum depth of directories to return files from.
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 *
 * @return
 *   An array of file objects of the specified type.
 */
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function system_listing($mask, $directory, $key = 'name', $min_depth = 1) {
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  $config = conf_init();
  $searchdir = array($directory);
  $files = array();

  if (file_exists("$config/$directory")) {
    $searchdir[] = "$config/$directory";
  }

  // Get current list of items
  foreach ($searchdir as $dir) {
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    $files = array_merge($files, file_scan_directory($dir, $mask, array('.', '..', 'CVS'), 0, TRUE, $key, $min_depth));
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  }

  return $files;
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}

/**
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 * Assign an initial, default set of blocks for a theme.
 *
 * This function is called the first time a new theme is enabled.  The new theme
 * gets a copy of the default theme's blocks, with the difference that if a
 * particular region isn't available in the new theme, the block is assigned
 * to the new theme's default region.
 *
 * @param $theme
 *   The name of a theme.
 */
function system_initialize_theme_blocks($theme) {
  // Initialize theme's blocks if none already registered.
  if (!(db_num_rows(db_query("SELECT module FROM {blocks} WHERE theme = '%s'", $theme)))) {
    $default_theme = variable_get('theme_default', 'bluemarine');
    $regions = system_region_list($theme);
    $result = db_query("SELECT * FROM {blocks} WHERE theme = '%s'", $default_theme);
    while($block = db_fetch_array($result)) {
      // If the region isn't supported by the theme, assign the block to the theme's default region.
      if (!array_key_exists($block['region'], $regions)) {
        $block['region'] = system_default_region($theme);
      }
      db_query("INSERT INTO {blocks} (module, delta, theme, status, weight, region, visibility, pages, custom, throttle) VALUES ('%s', '%s', '%s', %d, %d, '%s', %d, '%s', %d, %d)",
          $block['module'], $block['delta'], $theme, $block['status'], $block['weight'], $block['region'], $block['visibility'], $block['pages'], $block['custom'], $block['throttle']);
    }
  }
}

// Add the submit / reset buttons and run drupal_get_form()
function system_settings_form($form_id, $form) {
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  $form['buttons']['submit'] = array('#type' => 'submit', '#value' => t('Save configuration') );
  $form['buttons']['reset'] = array('#type' => 'submit', '#value' => t('Reset to defaults') );
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  if (!empty($_POST) && form_get_errors()) {
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    drupal_set_message(t('The settings have not been saved because of the errors.'), 'error');
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  }

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  return drupal_get_form($form_id, $form, 'system_settings_form');
}

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function system_theme_settings_execute($form_id, $values) {
  $op = isset($_POST['op']) ? $_POST['op'] : '';
  $key = $values['var'];

  if ($op == t('Reset to defaults')) {
    variable_del($key);
  }
  else {
    variable_set($key, $values);
  }
  if ($op == t('Reset to defaults')) {
    drupal_set_message(t('The configuration options have been reset to their default values.'));
  }
  else {
    drupal_set_message(t('The configuration options have been saved.'));
  }
}

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/**
 * Execute the system_settings_form.
 *
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 * If you want node type configure style handling of your checkboxes,
 * add an array_filter value to your form.
 *
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 */
function system_settings_form_execute($form_id, $values) {
  $op = isset($_POST['op']) ? $_POST['op'] : '';

  foreach ($values as $key => $value) {
    if ($op == t('Reset to defaults')) {
      variable_del($key);
    }
    else {
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      if (is_array($value) && isset($values['array_filter'])) {
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        $value = array_keys(array_filter($value));
      }
      variable_set($key, $value);
    }
  }
  if ($op == t('Reset to defaults')) {
    drupal_set_message(t('The configuration options have been reset to their default values.'));
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  }
  else {
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    drupal_set_message(t('The configuration options have been saved.'));
  }
}

/**
 * Do the clean url validation, changing the form property if it doesn't work.
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 */
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function system_settings_validate($form_id, &$form) {
 #TODO .. fix here.
 if ($edit['clean_url'] && !variable_get('clean_url_ok', 0)) {
   drupal_set_message(t('It appears your host is not configured correctly for Clean URLs. Please check for <code>ModRewrite</code> support with your administrator.'), 'error');
   $edit['clean_url'] = 0;
 }

}




/**
 * Menu callback; displays a listing of all themes.
 */
function system_themes() {
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  $themes = system_theme_data();
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  ksort($themes);

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  foreach ($themes as $info) {
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    $info->screenshot = dirname($info->filename) . '/screenshot.png';
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    $screenshot = file_exists($info->screenshot) ? theme('image', $info->screenshot, t('Screenshot for %theme theme', array('%theme' => $info->name)), '', array('class' => 'screenshot'), false) : t('no screenshot');
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    $form[$info->name]['screenshot'] = array('#type' => 'markup', '#value' => $screenshot);
    $form[$info->name]['description'] = array('#type' => 'item', '#title' => $info->name,  '#value' => dirname($info->filename));
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    $options[$info->name] = '';
    if ($info->status) {
      $status[] = $info->name;
    }
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    if ($info->status && (function_exists($info->prefix . '_settings') || function_exists($info->prefix . '_features'))) {
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      $form[$info->name]['operations'] = array('#type' => 'markup', '#value' => l(t('configure'), 'admin/themes/settings/' . $info->name) );
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    }
    else {
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      // Dummy element for form_render. Cleaner than adding a check in the theme function.
      $form[$info->name]['operations'] = array();
    }
  }

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  $form['status'] = array('#type' => 'checkboxes', '#options' => $options, '#default_value' => $status);
  $form['theme_default'] = array('#type' => 'radios', '#options' => $options, '#default_value' => variable_get('theme_default', 'bluemarine'));
  $form['buttons']['submit'] = array('#type' => 'submit', '#value' => t('Save configuration') );
  $form['buttons']['reset'] = array('#type' => 'submit', '#value' => t('Reset to defaults') );
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  return drupal_get_form('system_themes', $form);
}

function theme_system_themes($form) {
  foreach (element_children($form) as $key) {
    $row = array();
    if (is_array($form[$key]['description'])) {
      $row[] = form_render($form[$key]['screenshot']);
      $row[] = form_render($form[$key]['description']);
      $row[] = array('data' => form_render($form['status'][$key]), 'align' => 'center');
      if ($form['theme_default']) {
        $row[] = array('data' => form_render($form['theme_default'][$key]), 'align' => 'center');
        $row[] = array('data' => form_render($form[$key]['operations']), 'align' => 'center');
      }
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    }
    $rows[] = $row;
  }

  $header = array(t('Screenshot'), t('Name'), t('Enabled'), t('Default'), t('Operations'));
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  $output = theme('table', $header, $rows);
  $output .= form_render($form);
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  return $output;
}

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function system_themes_execute($form_id, $values) {

  db_query("UPDATE {system} SET status = 0 WHERE type = 'theme'");

  if ($_POST['op'] == t('Save configuration')) {
    if (is_array($values['status'])) {
      foreach ($values['status'] as $key => $choice) {
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        // Always enable the default theme, despite its status checkbox being checked:
        if ($choice || $values['theme_default'] == $key) {
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          // If theme status is being set to 1 from 0, initialize block data for this theme if necessary.
          if (db_num_rows(db_query("SELECT status FROM {system} WHERE type = 'theme' AND name = '%s' AND status = 0", $key))) {
            system_initialize_theme_blocks($key);
          }
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          db_query("UPDATE {system} SET status = 1 WHERE type = 'theme' and name = '%s'", $key);
        }
      }
    }
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    variable_set('theme_default', $values['theme_default']);
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  }
  else {
    variable_del('theme_default');
  }

  drupal_set_message(t('The configuration options have been saved.'));
  drupal_goto('admin/themes');
}

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/**
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 * Menu callback; displays a listing of all modules.
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 */
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function system_modules() {
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  // Get current list of modules
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  $files = system_listing('\.module$', 'modules', 'name', 0);
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  // Extract current files from database.
  system_get_files_database($files, 'module');

  ksort($files);

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  foreach ($files as $filename => $file) {
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    drupal_get_filename('module', $file->name, $file->filename);
    drupal_load('module', $file->name);

    $file->description = module_invoke($file->name, 'help', 'admin/modules#description');
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    $form['name'][$file->name] = array('#value' => $file->name);
    $form['description'][$file->name] = array('#value' => $file->description);
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    $options[$file->name] = '';
    if ($file->status) {
      $status[] = $file->name;
    }
    if ($file->throttle) {
      $throttle[] = $file->name;
    }

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    // log the critical hooks implemented by this module
    $bootstrap = 0;
    foreach (bootstrap_hooks() as $hook) {
      if (module_hook($file->name, $hook)) {
        $bootstrap = 1;
        break;
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      }
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    }

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    // Update the contents of the system table:
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    db_query("DELETE FROM {system} WHERE name = '%s' AND type = '%s'", $file->name, 'module');
    db_query("INSERT INTO {system} (name, description, type, filename, status, throttle, bootstrap) VALUES ('%s', '%s', '%s', '%s', %d, %d, %d)", $file->name, $file->description, 'module', $file->filename, $file->status, $file->throttle, $bootstrap);
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  }
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  // Handle status checkboxes, including overriding the generated
  // checkboxes for required modules.
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  $form['status'] = array('#type' => 'checkboxes', '#default_value' => $status, '#options' => $options);
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  $required = array('block', 'filter', 'system', 'user', 'watchdog');
  foreach ($required as $require) {
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    $form['status'][$require] = array('#type' => 'hidden', '#value' => 1, '#suffix' => t('required'));
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  }
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  /**
   * Handle throttle checkboxes, including overriding the generated checkboxes for required modules.
   */
  if (module_exist('throttle')) {
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    $form['throttle'] = array('#type' => 'checkboxes', '#default_value' => $throttle, '#options' => $options);
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    $throttle_required = array_merge($required, array('throttle'));
    foreach ($throttle_required as $require) {
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      $form['throttle'][$require] = array('#type' => 'hidden', '#value' => 1, '#suffix' => t('required'));
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    }
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  }
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  $form['buttons']['submit'] = array('#type' => 'submit', '#value' => t('Save configuration'));
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  return drupal_get_form('system_modules', $form);
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}
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function theme_system_modules($form) {
  foreach (element_children($form['name']) as $key) {
    $row = array();
    $row[] = form_render($form['name'][$key]);
    $row[] = form_render($form['description'][$key]);
    $row[] = array('data' => form_render($form['status'][$key]), 'align' => 'center');

    if (module_exist('throttle')) {
      $row[] = array('data' => form_render($form['throttle'][$key]), 'align' => 'center');
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    }
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    $rows[] = $row;
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  }
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  $header = array(t('Name'), t('Description'), t('Enabled'));
  if (module_exist('throttle')) {
    $header[] = t('Throttle');
  }
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  $output = theme('table', $header, $rows);
  $output .= form_render($form);
  return $output;