View difference between Paste ID: CN8chJXM and xbrzcxRQ

 local tArgs = { ... }
 if #tArgs ~= 1 then
 	print( "Usage: stairs <deepth>" )
 	return
 end
 
 local deepth = tArgs[1];
 
 -- left: 1
 -- forward: 2
 -- right: 3
 
 local direction = 2;
 local xPos = -1;
 local yPos = 0;
 local zPos = 0;
 
 local function turnLeft()
 	if (direction == 1) then
 		return false
 	end
-	turtle.left();
+	turtle.turnLeft();
 	direction = direction - 1;
 	return true;
 end
 
 local function turnRight()
 	if (direction == 3) then
 		return false
 	end
-	turtle.right();
+	turtle.turnRight();
 	direction = direction + 1;
 	return true;
 end
 
 local function perforate()
 	local result = turtle.dig();
 	turtle.drop();
 	os.sleep(0.8);
 	return result;
 end
 
 local function perforate()
 	local result = turtle.digDown();
 	turtle.drop();
 	os.sleep(0.8);
 	return result;
 end
 
 local function advance()
 	if (turtle.detect()) then
 		if (not perforate()) then
 			return false;
 		end
 	end
 	turtle.forward();
 	if (direction == 2) then
 		xPos = xPos + 1;
 	elseif (direction == 1) then
 		yPos = yPos - 1;
 	elseif (direction == 3) then
 		yPos = yPos + 1;
 	end
 	return true;
 end
 
 local function advanceUp()
 	turtle.up();
 	zPos = zPos + 1;
 	return true;
 end
 
 local function advanceDown()
 	if (turtle.detectDown()) then
 		if (not perforateDown()) then
 			return false;
 		end
 	end
 
 	turtle.down();
 	zPos = zPos - 1;
 	return true;
 end
 
 local blockEnd = true;
 local done     = false;
 
 turnRight();
 
 
 local movement = {}
 movement[0] = advance;
 movement[1] = advanceUp;
 movement[2] = advanceDown;
 movement[3] = turnLeft;
 movement[4] = turnRight;
 
 local blockUp = {3,0,2,3,0,0,0,4,4,1,0,0,0,3,3,1,0,0,0,4,4,1,0,0,0};
 local blockDown = {3,2,0,3,0,0,0,2,4,4,0,0,0,2,3,3,0,0,0,2,4,4,0,0,0};
 
 while (not done) do
 	local block;
 	if (isDown) then
 		block = blockDown;
 	else
 		block = blockUp;
 	end
 
 	for n = 1,#block do
 		local mov = block[n];
 		if (not movement[mov]()) then
 			done = true;
 			break;
 		end
 	end
 	deepth = deepth - 1;
 	if (deepth == 0) then
 		break;
 	end
 end
 
 print("Ended with no errors!");