```ruby
class Map

	def initialize(window, mapfile)
		@window = window
		@tileset = Gosu::Image.load_tiles(window, 'media/32x32diagonal_lines.png',
		                                  32, 32, false)
	end

end
```

Create get_lines method, covert tabs to spaces
user
```ruby
class Map

  def initialize(window, mapfile)
    @window = window
    @tileset = Gosu::Image.load_tiles(window, 'media/32x32diagonal_lines.png',
                                      32, 32, false)
  end

  def get_lines(file)
    @lines = File.readlines(file).map { |line| line.chomp }
  end

end
```
assistant