--first two slots are base mats

x,y,z = 0,0,0
local length = 10
local width = 10
local height = 10

function ClearLand(length,height)
  --will clear land for building.
  for i=1,length do
    matLeft = turtle.getItemCount(1)
    if matLeft <= 1 then
      turtle.select(2)
    else
      turtle.select(1)
    end
    frontB = turtle.detect()
    upB = turtle.detectUp()
    downB = turtle.detectDown()
    if frontB and i<length then
      turtle.dig()
    end
    if upB then
      turtle.digUp()
      turtle.up()
      y=y+1

      local curH = 0
      for p=1,height do
        upB2 = turtle.detectUp()
        curH = curH + 1
        if upB2 then
          turtle.digUp()
          turtle.up()
          y=y+1
        else
          break
        end
      end
      print(curH)
      for q=1,curH do
        turtle.down()
        y=y-1
      end
    end
    if downB == false then
      turtle.placeDown()
    else
      turtle.digDown()
      turtle.placeDown()
    end
    if i < length then
      turtle.forward()
      x=x+1
    end
  end
  print("Finished column.")
end

function main(length,width,height)
  for i=1,width do
    ClearLand(length,height)
    if i < width and i%2==0 then
      turtle.turnLeft()
      local block = turtle.detect()
      if block then
        turtle.dig()
      end
      turtle.forward()
      turtle.turnLeft()
    else
      turtle.turnRight()
      block = turtle.detect()
      if block then
        turtle.dig()
      end
      turtle.forward()
      turtle.turnRight()
    end
  end
  print("I'm done.")
end

main(length,width,height)