build floor

local tArgs = {...}
local size = tonumber(tArgs[1])
local halfslabs = string.lower(tArgs[2] or "") == "true"
if not size then
    error("Usage: "..shell.getRunningProgram().." <size> [halfslabs]", 0)
end

local left = true
local selected = 1

turtle.select(selected)

local function goForward()
    while not turtle.forward() do
        turtle.dig()
    end
end

local function placeDown()
    if turtle.detectDown() then
        turtle.digDown()
    end
    turtle.placeDown()
end

for i = 1, size do
    for i = 1, size do
        while turtle.getItemCount(selected) == 0 do
            selected = selected + 1
            turtle.select(selected)
        end
        placeDown()
        while turtle.getItemCount(selected) == 0 do
            selected = selected + 1
            turtle.select(selected)
        end
        if halfslabs then placeDown() end
        goForward()
    end
    if left then
        turtle.turnLeft()
        goForward()
        turtle.turnLeft()
    else
        turtle.turnRight()
        goForward()
        turtle.turnRight()
    end
    left = not left
end