local f = App.open_for_writing(Directory..'config')
  assert(f)
  f:write(json.encode({
    columns=column_names,
    column_width=Display_settings.column_width,
    cursor_col=Cursor_pane.col,
    cursor_row=Cursor_pane.row,
    surface_x=Display_settings.x,
    surface_y=Display_settings.y,
  }))

  local status = App.write_file(Directory..'config',
      json.encode({
        columns=column_names,
        column_width=Display_settings.column_width,
        cursor_col=Cursor_pane.col,
        cursor_row=Cursor_pane.row,
        surface_x=Display_settings.x,
        surface_y=Display_settings.y,
      }))
  assert(status)

  local f, err = App.open_for_reading(Directory..filename)

  local contents, err = App.read_file(Directory..filename)

  local contents = f:read()
  f:close()

  return {
    write = function(self, s)
              App.filesystem[filename] = App.filesystem[filename]..s
            end,
    close = function(self)
            end,
  }

        if ok then
          return result
        else
          return ok, err
        end
      end
  App.open_for_writing =
      function(filename)
        local result = nativefs.newFile(filename)
        local ok, err = result:open('w')

        end
      end

        end
      end
  App.read_file =
      function(path)
        if not is_absolute_path(path) then
          return --[[status]] false, 'Please use an unambiguous absolute path.'
        end
        local f, err = App.open_for_reading(path)
        if err then
          return --[[status]] false, err
        local contents = f:read()
        f:close()
        return contents
  App.write_file =
      function(path, contents)
        if not is_absolute_path(path) then
          return --[[status]] false, 'Please use an unambiguous absolute path.'
        end
        local f, err = App.open_for_writing(path)
        if err then
          return --[[status]] false, err
        end
        f:write(contents)
        f:close()
        return --[[status]] true
      end

        end

      end
  App.open_for_writing =
      function(filename)
        local result = nativefs.newFile(filename)
        local ok, err = result:open('w')
        if ok then
          return result
        else
          return ok, err
        end
      end