gistfile1.php[345]

class provisionConfig_drushrc extends provisionConfig {
  public $template = 'provision_drushrc.tpl.php';
  public $description = 'Drush configuration file';
  protected $mode = 0400;
  protected $context_name = 'drush';

  function filename() {
    return _drush_config_file($this->context_name);
  }

  function __construct($data = array()) {
    parent::__construct($data);
    $this->load_data();

  }
  function load_data() {
    // we fetch the context to pass into the template based on the context name
    $this->data = array_merge(drush_get_context($this->context_name), $this->data);
  }

  function process() {
    unset($this->data['context-path']);
    unset($this->data['config-file']);
    $this->data['option_keys'] = array_keys($this->data);
  }
}

// class to read and write an alias record
class provisionConfig_drushrc_alias extends provisionConfig_drushrc {
  function __construct($aliasname, $data = array()) {
    parent::construct($data);
    $this->alias_name = $aliasname;
  }

  function load_data() {
     // do something about alias_load_data
  }

  function filename() {
    return drush_get_option('alias-path', drush_server_home() . '/.drush/aliases/') . trim($this->aliasname, '@'); 
  }
}