class ThemeUpdater

class ThemeUpdater extends Updater implements DrupalUpdaterInterface {
    
    /**
     * Return the directory where a theme should be installed.
     *
     * If the theme is already installed, drupal_get_path() will return
     * a valid path and we should install it there (although we need to use an
     * absolute path, so we prepend DRUPAL_ROOT). If we're installing a new
     * theme, we always want it to go into sites/all/themes, since that's
     * where all the documentation recommends users install their themes, and
     * there's no way that can conflict on a multi-site installation, since
     * the Update manager won't let you install a new theme if it's already
     * found on your system, and if there was a copy in sites/all, we'd see it.
     */
    public function getInstallDirectory() {
        if ($this->isInstalled() && ($relative_path = drupal_get_path('theme', $this->name))) {
            $relative_path = dirname($relative_path);
        }
        else {
            $relative_path = 'sites/all/themes';
        }
        return DRUPAL_ROOT . '/' . $relative_path;
    }
    public function isInstalled() {
        return (bool) drupal_get_filename('theme', $this->name, NULL, FALSE);
    }
    static function canUpdateDirectory($directory) {
        // This is a lousy test, but don't know how else to confirm it is a theme.
        if (file_scan_directory($directory, '/.*\\.module$/')) {
            return FALSE;
        }
        return TRUE;
    }
    public static function canUpdate($project_name) {
        return (bool) drupal_get_path('theme', $project_name);
    }
    public function postInstall() {
        // Update the system table.
        clearstatcache();
        system_rebuild_theme_data();
    }
    public function postInstallTasks() {
        return array(
            l(t('Enable newly added themes'), 'admin/appearance'),
            l(t('Administration pages'), 'admin'),
        );
    }

}