floorbot.lua

local args = { ... }
local size = args[1]

local function is_stone_below()
    local success, data = turtle.inspect()
    if not success then
        return false
    end
    if data.name == "minecraft:stone" then
        return true
    end
    return false
end

local function find_stone()
    for s = 1, 16 do
        turtle.select(s)
        if turtle.getItemDetail() and turtle.getItemDetail().name == "minecraft:stone" then
            return true
        end
    end
    return false
end

local function select_stone()
    while true do
        if find_stone() then
            return
        end
        os.pullEvent('turtle_inventory')
    end
end

local function do_replace()
    if is_stone_below() then
        return
    end
    -- Not stone
    turtle.digDown()
    turtle.placeDown()
end

local function check_fuel(amount)
    if not amount then
        amount = 1
    end
    if turtle.getFuelLevel() < amount then
        while true do
            if turtle.refuel() then
                return
            end
            os.pullEvent('turtle_inventory')
        end
    end
end

local orientation_fw = true

local function init()
    for x = 0, size do
        for z = 0, size do
            check_fuel(1)
            do_replace()
            turtle.forward()
        end

        if orientation_fw then
            turtle.turnRight()
            turtle.forward()
            turtle.turnRight()
            orientation_fw = false
        else
            turtle.turnLeft()
            turtle.forward()
            turtle.turnLeft()
            orientation_fw = true
        end
    end
end

if not size then
    print("Missing args")
else
    init()
end