<?php
// $Id$

/**
 * @file
 * Contains infrequently used theme registry build functions.
 */

/**
 * Implements HOOK_theme().
 *
 * The Zen base theme uses this function as a work-around for a bug in Drupal
 * 6.0-6.4: #252430 (Allow BASETHEME_ prefix in preprocessor function names).
 *
 * Sub-themes Also use this function by calling it from their HOOK_theme() in
 * order to get around a design limitation in Drupal 6: #249532 (Allow subthemes
 * to have preprocess hooks without tpl files.)
 *
 * @param $existing
 *   An array of existing implementations that may be used for override purposes.
 * @param $type
 *   What 'type' is being processed.
 * @param $theme
 *   The actual name of theme that is being being checked.
 * @param $path
 *   The directory path of the theme or module, so that it doesn't need to be looked up.
 */
function _zen_theme(&$existing, $type, $theme, $path) {
  // Each theme has two possible preprocess functions that can act on a hook.
  // This function applies to every hook.
  $functions[0] = $theme . '_preprocess';
  // Inspect the preprocess functions for every hook in the theme registry.
  // @TODO: When PHP 5 becomes required (Zen 7.x), use the following faster
  // implementation: foreach ($existing AS $hook => &$value) {}
  foreach (array_keys($existing) AS $hook) {
    // Each theme has two possible preprocess functions that can act on a hook.
    // This function only applies to this hook.
    $functions[1] = $theme . '_preprocess_' . $hook;
    foreach ($functions AS $key => $function) {
      // Add any functions that are not already in the registry.
      if (function_exists($function) && !in_array($function, $existing[$hook]['preprocess functions'])) {
        // We add the preprocess function to the end of the existing list.
        $existing[$hook]['preprocess functions'][] = $function;
      }
    }
  }

  // Since we are rebuilding the theme registry and the theme settings' default
  // values may have changed, make sure they are saved in the database properly.
  zen_theme_get_default_settings($theme);

  // Since we modify the $existing cache directly, return nothing.
  return array();
}

/**
 * Return the theme settings' default values from the .info and save them into the database.
 *
 * @param $theme
 *   The name of theme.
 */
function zen_theme_get_default_settings($theme) {
  $themes = list_themes();

  // Get the default values from the .info file.
  $defaults = !empty($themes[$theme]->info['settings']) ? $themes[$theme]->info['settings'] : array();

  if (!empty($defaults)) {
    // Get the theme settings saved in the database.
    $settings = theme_get_settings($theme);
    // Don't save the toggle_node_info_ variables.
    if (module_exists('node')) {
      foreach (node_get_types() as $type => $name) {
        unset($settings['toggle_node_info_' . $type]);
      }
    }
    // Save default theme settings.
    variable_set(
      str_replace('/', '_', 'theme_' . $theme . '_settings'),
      array_merge($defaults, $settings)
    );
    // If the active theme has been loaded, force refresh of Drupal internals.
    if (!empty($GLOBALS['theme_key'])) {
      theme_get_setting('', TRUE);
    }
  }

  // Return the default settings.
  return $defaults;
}