<?php

/**
 * Command callback for drush cache-clear.
 */
 function drush_core_cache_clear($type = NULL) {
  switch (drush_drupal_major_version()) {
    case 5:
      // clear preprocessor cache
      drupal_clear_css_cache();

      // clear core tables
      $core = array('cache', 'cache_filter', 'cache_menu', 'cache_page');
      $alltables = array_merge($core, module_invoke_all('devel_caches'));
      foreach ($alltables as $table) {
        cache_clear_all('*', $table, TRUE);
      }
      drush_print(dt('Cache cleared.'));
      break;
    case 6:
    case 7:
    default:
      $types = drush_cache_clear_types();
      // Check if the provided type ($type) is a valid cache type.
      if ($type && !key_exists($type, $types)) {
        return drush_set_error(dt("'!type' cache is not a valid cache type", array('!type' => $type)));
      }

      if ($type) {
        drush_op($types[$type]);
        drush_log(dt("'!name' cache was cleared", array('!name' => $type)), 'success');
      }
      else {
        $choice = drush_choice($types, 'Enter a number to choose which cache to clear.', '!key');
        if ($choice !== FALSE) {
          call_user_func($types[$choice]);
          drush_log(dt("'!name' cache was cleared", array('!name' => $choice)), 'success');
        }
      }
      break;
  }
}

function drush_cache_clear_types() {
  $types = array(
    'all' => 'drupal_flush_all_caches',
    'theme registry' => 'drush_cache_clear_theme_registry',
    'menu' => 'menu_rebuild',
    'css+js' => 'drush_cache_clear_css_js',
    'block' => 'drush_cache_clear_block',
    'module list' => 'drush_get_modules',
    'theme list' => 'drush_get_themes',
  );
  if (drush_drupal_major_version() >= 7) {
    $types['registry'] = 'registry_update';
  }
  elseif (drush_drupal_major_version() == 6 && module_exists('autoload')) {
    // TODO: move this to autoload module. 
    $types['registry'] = 'autoload_registry_update';
  }
  if (count(module_implements('node_grants'))) {
    $types['nodeaccess'] = 'node_access_rebuild';
  }

  // Include the appropriate environment engine, so callbacks can use core
  // version specific cache clearing functions directly.
  drush_include_engine('drupal', 'environment');

  // Command files may customize $types as desired.
  drush_command_invoke_all_ref('drush_cache_clear', $types);
  return $types;
}

function drush_cache_clear_theme_registry() {
  drush_db_delete('cache', 'cid LIKE :theme_registry', array(':theme_registry' => 'theme_registry%'));
}

function drush_cache_clear_css_js() {
  _drupal_flush_css_js();
  drupal_clear_css_cache();
  drupal_clear_js_cache();
}

/**
 * Clear the cache of the block output.
 */
function drush_cache_clear_block() {
  cache_clear_all(NULL, 'cache_block');
}