build floor v2

local tArgs = {...}
local halfslabs = string.lower(tArgs[1] or "") == "true"

local left = true
local selected = 1

turtle.select(selected)

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

local function place()
    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
end

while true do
    while not turtle.detect() do
        place()
        turtle.forward()
    end
    place()
    if left then
        turtle.turnLeft()
        turtle.forward()
        turtle.turnLeft()
    else
        turtle.turnRight()
        turtle.forward()
        turtle.turnRight()
    end
    left = not left
end