Platform maker 1.1

-- * Platform maker 1.1
-- * Made by: Acuena
-- * Usage: platform length width

-- Variables
curslot = 2
fuelused = 0
blocksplaced = -1
totalnrblocks = 0

-- Functions

function moveforward()
	while not turtle.forward() do
		checkfuel()
	end
end

function moveback()
	while not turtle.back() do
		checkfuel()
	end
end

function checkfuel()
	if turtle.getFuelLevel() < 1 then
		turtle.select(1)
		if not turtle.refuel(1) then
			print("No fuel in slot 1, awaiting fuel")
			while not turtle.refuel(1) do
			end
			print("Successfully refueld, continuing")
		end
		fuelused = fuelused + 1
		turtle.select(curslot)
	end
end

function turnright()
	turtle.turnRight()
	moveforward()
	turtle.turnRight()
end

function turnleft()
	turtle.turnLeft()
	moveforward()
	turtle.turnLeft()
end

function checkblockcount()
	if turtle.getItemCount(curslot) == 0 then
		selnextslot()
	end
end

function selnextslot()
	curslot = curslot + 1
	if curslot > 16 then
		print("Out of blocks, terminating")
		error()
	end
	turtle.select(curslot)
end

function place()
	checkblockcount()
	turtle.placeDown()
	blocksplaced = blocksplaced + 1
end

function countblocks()
	for i = 2,16 do
		turtle.select(i)
		totalnrblocks = totalnrblocks + turtle.getItemCount(i)
	end
	if not totalnrblocks == 0 then
		totalnrblocks = totalnrblocks + 1
	end
	turtle.select(curslot)
end

function returntostart()
	if orient == true then
		turtle.turnRight()
		for i = 1, width do
			moveforward()
		end
		turtle.turnRight()
		for i = 1, length do
		moveback()
		end
	elseif orient == false then
		turtle.turnLeft()
		for i = 1, width do
			moveforward()
		end
		turtle.turnRight()
		turtle.back()
	end
end

-- Code

local args = {...}
orient=false
if #args ~= 2 then
	print("Usage: platform length width")
	return
end

length = tonumber(args[1])
width = tonumber(args[2])

countblocks()
need = length * width

if need > 960 then
	print("Unable to carry more than 960 block's")
	print("A platform with the size of:")
	print(length.."x"..width.." will need "..need.." blocks")
	print("Aborting run")
	error()
end

if totalnrblocks < need then
	print("Not enough blocks, aborting")
	print("Need: "..need)
	print("Have: "..totalnrblocks.." block's")
	error()
end

moveforward()
place()
for xx = 1,width do
	for x = 1, length-1 do
	moveforward()
	place()
end

if orient == false then -- Should turn right
	turnright()
	place()
else -- Should turn left
	turnleft()
	place()
end
orient = not orient
end
turtle.digDown()
returntostart()
print("Platform done")
print("Block's placed: "..blocksplaced)
print("Fuel used: "..fuelused)