test

local finished = false
local wall = 0

function line()
  turtle.select(2)
  if not turtle.detectDown() then
   turtle.placeDown()
   print("block placed")
  end
  if not turtle.detect() then
   turtle.forward()
   print("moving forward")
   else
     turtle.select(3)
     if turtle.compare() then
      finished = true
      print("i am finished")
      else
        print("i have reached a wall")
        if wall == 0 then
          turtle.turnRight()
          turtle.forward()
          turtle.turnLeft()
          while not turtle.detect() do
            turtle.forward()
          end
          print("i have reached the second wall")
          wall = 1
          turtle.turnRight()
          turtle.turnRight()
          elseif wall == 1 then
            turtle.turnLeft()
            turtle.forward()
            turtle.turnRight()
            while not turtle.detect() do
              turtle.forward()
            end
            print("i have reached the third wall")
            wall = 0
            turtle.turnLeft()
            turtle.turnLeft()
        end
     end
  end
end

while finished == false do
  line()
  print("restarting while loop")
end