Turtle Place Wall Blocks fuck

local tArg = {...}

local height = tonumber(tArg[1] or "") or 45
local length = tonumber(tArg[2] or "") or 30

turtle.refuel(64)
turtle.select(1)

local saveFile = "lastpos.dat"

local saveState = function(x, y)
    local file = fs.open(saveFile, "w")
    file:writeLine(x)
    file:writeLine(y)
    file.close()
end


local loadState = function()
    local file = fs.open(saveFile, "r")
    local x = tonumber(file:readLine())
    local y = tonumber(file:readLine())
    file.close()
    return x, y
end

local function place()
    if turtle.getItemCount() == 0 then
        for i = 1, 16 do
            if turtle.getItemCount(i) > 0 then
                turtle.select(i)
                turtle.placeDown()
                return true
            end
        end
    else
        turtle.placeDown()
        return true
    end
    return false
end

local function goUp()
    repeat until turtle.up()
end

local function goForward()
    repeat until turtle.forward()
end

local function goBack()
    repeat until turtle.forward()
end

local startX, startY

if fs.exists(saveFile) then
    print("Save file found.")
    startX, startY = loadState()
else
    goUp()
end

for y = startY or 1, height - 1 do
    for x = startX or 1, length do
        saveState()
        if not place() then
            print("Ran out of shit. Fuck you")
            print("Please insert more shit")
            repeat
                sleep(0.5)
            until place()
            print("Cheers")
        end
        if x ~= length then
            if y % 2 == 1 then
                turtle.forward()
            else
                turtle.back()
            end
        end
    end
    if y ~= height - 1 then
        goUp()
    end
    startX = 1
end

print("All done.")
fs.delete(saveFile)