anchor.diff:  
   -export([
            verbose/3,
  +         priv_dir/1,
            move_to_download_dir/1,
            get_downloader/0,
            open_downloader_port/1,
  
positive.code:       io_lib:format(
          "~s ~s ~s ~s",
          [get_downloader(),
           "--filename-format '%t-%i.%s'",
           application:get_env(vffov, downloader_params, ""),
           Url])
       ).
  
negative.code:     case application:get_env(vffov, enable_logging, false) of
          false -> io:format(Msg ++ "\n", Args);
          true  -> lager:log(Type, Msg, Args)
      end.
  
  priv_dir(App) ->
      case code:priv_dir(App) of
          {error, bad_name} ->
              {ok, Cwd} = file:get_cwd(),
              Cwd ++ "/" ++ "priv/";
          Priv ->
              Priv ++ "/"
      end.
  
  move_to_download_dir(Url) ->
  