Quarry Cover

local x = 1
turtle.forward() -- Move into hole
while(true)
do
   while (turtle.detectDown() == false)
   do
         if(turtle.getItemCount(x)==0)
         then
            x=x+1
            if(x==10) then
                  x = 1
            end
            turtle.select(x)
         end
         turtle.placeDown()
         turtle.forward()
         if(turtle.detect()) and (turtle.detectDown() == false)
         then
           turtle.turnLeft()
         end
   end
   while (turtle.detectDown() == true) do
    turtle.back()
    turtle.turnLeft()
    turtle.forward()
   end
--   turtle.back()
--   turtle.turnLeft()
end