Wall Build

local targs = {...}

if #targs ~= 2 then
        print("floor <length> <width>")
        error()
end

local length = tonumber(targs[1])
local height = tonumber(targs[2])

local curBlockSelection = 2
-- Functions used in Main code
function confirmBlock()
    if turtle.getItemCount(curSelection) <= 1 then
        for i = 1, 16 do
            if turtle.compareTo(i) and not (i == curBlockSelection) then
                turtle.select(i)
                turtle.transferTo(curBlockSelection)
                turtle.select(curBlockSelection)
            end
        end
        if turtle.getItemCount(curSelection) <= 1 then
            print("No more wall block in inventory, we fucked")
            error()
        end
    end
end
function moveUp()
    if not turtle.up() then
        turtle.digUp()
        turtle.up()
    end
end
function placeUp()
    confirmBlock()
    if not turtle.placeUp() then
        turtle.digUp()
        turtle.placeUp()
    end
end
function moveDown()
    if not turtle.down() then
        turtle.digDown()
        turtle.down()
    end
end
function placeDown()
    confirmBlock()
    if not turtle.placeDown() then
        turtle.digDown()
        turtle.placeDown()
    end
end
function moveForward()
    confirmBlock()
    if not turtle.forward() then
        turtle.dig()
        turtle.forward()
    end
end

--Initialization (refuel and get initial position)
turtle.refuel()
turtle.select(curSelection)
for i = 1, height - 2 do
    moveUp()
end
-- Starts on opposite side on odd cases so it will reposition back correctly at the end
if (height % 2) == 1 then
    for i = 1, length do
        moveForward()
    end
    turtle.turnLeft()
    turtle.turnLeft()
end
--Main Wall-Making Code
for j = 1, height do
    for i = 1, length do
        if (turtle.getFuelLevel() <= 1) then
            turtle.refuel()
        end
        placeUp()
        moveForward()
    end
    print("Finished ", j ," out of ", height, " rows")
    moveDown()
    turtle.turnLeft()
    turtle.turnLeft()
    moveForward()
end
turtle.back()
for i = 1, 2 do
    moveUp()
    turtle.turnLeft()
end