filename = love.filesystem.getSourceBaseDirectory()..'/lines.txt',  -- '/' should work even on Windows
    next_save = nil,
    -- undo
    history = {},
    next_history = 1,
    -- search
    search_term = nil,
    search_text = nil,
    search_backup = nil,  -- stuff to restore when cancelling search
  }
  return result
end  -- App.initialize_state

    filename = love.filesystem.getUserDirectory()..'/lines.txt',  -- '/' should work even on Windows

    filename = love.filesystem.getSourceBaseDirectory()..'/lines.txt',  -- '/' should work even on Windows

By default, it reads/writes the file `lines.txt` in your default
By default, lines.love reads/writes the file `lines.txt` in a directory

By default, it reads/writes the file `lines.txt` in a directory