liner - line-following cc miner bot

while true do
  turtle.digDown()
  while not turtle.forward() do turtle.dig() end
  if not turtle.compareDown() then
    turtle.back()
    turtle.turnRight()
    while not turtle.forward() do turtle.dig() end
    if not turtle.compareDown() then
      turtle.turnLeft()
      turtle.turnLeft()
      turtle.forward()
      while not turtle.forward() do turtle.dig() end
      if not turtle.compareDown() then
        print("line ended!")
        return
      end
    end
  end
end