assert(#arg == 0)

  -- '/' should work even on Windows

  Editor_state.filename = Editor_state.directory..Editor_state.file_path

  local base_dir = dirname(love.filesystem.getSaveDirectory())
  if #arg == 0 then
    Editor_state.directory = 'pensieve/data/'
  else
    Editor_state.directory = 'pensieve/data.'..arg[1]..'/'
  end
  Editor_state.filename = base_dir..Editor_state.directory..Editor_state.file_path

    directory = dirname(love.filesystem.getSaveDirectory())..'pensieve/data/',  -- '/' should work even on Windows

    directory = nil,

If you invoke pensieve with an additional arg (see its docs), you can also
pass it in to capture.