Scale

local top = 46
local bottom = 7
local width = 63

local xSep = 2
local ySep = 4

local torches = 2

local function refuel()
    if turtle.getFuelLevel() == 0 then
        local prev = turtle.getSelectedSlot()
        turtle.select(1)
        if not turtle.refuel(1) then
            print('Need more fuel')
            while not turtle.refuel(1) do
                sleep(1)
            end
        end
        turtle.select(prev)
    end
end

local function advance()
    if turtle.getSelectedSlot() == 16 then
        print('Need more materials')
        local empty = true
        while empty do
            for n=3, 16 do
                if turtle.getItemCount(n) > 0 and turtle.getItemDetail(n).name ~= 'chisel:marble' then
                    empty = false
                    turtle.select(n)
                    return
                end
            end
            sleep(5)
        end
    else
        turtle.select(turtle.getSelectedSlot() + 1)
    end
end

local function replace()
    while turtle.detect() do
        turtle.dig()
        sleep(.5)
    end
    local data = turtle.getItemDetail()
    while turtle.getItemCount() == 0 or turtle.getItemDetail().name ~= 'chisel:marble' do
        advance()
    end
    turtle.place()

end

local function returnToFloor()
    turtle.turnRight()
    while not turtle.forward() do
        turtle.dig()
        sleep(.5)
    end
    turtle.turnLeft()
end

local function checkForTorch(x, y)
    if x % 6 == xSep then
        if x % 2 == 0 then
            print(y)
            if (y-1) % 6 == ySep then
                local prev = turtle.getSelectedSlot()
                turtle.select(torches)
                if not turtle.placeUp() then
                    print 'Need more torches'
                    while not turtle.placeUp() do
                        sleep(5)
                    end
                end
                turtle.select(prev)
            end
        else
            if (y-1) % 6 == ySep then
                local prev = turtle.getSelectedSlot()
                turtle.select(torches)
                if not turtle.placeUp() then
                    print 'Need more torches'
                    while not turtle.placeUp() do
                        sleep(5)
                    end
                end
                turtle.select(prev)
            end
        end
    end
end

turtle.select(3)
for i = 1, width, 1 do
     local success, data = turtle.inspect()
        if success then
            if data.name ~= 'chisel:marble' then
                replace()
            end
        else
            replace()
        end
    for j = bottom, top - 2, 1 do
        refuel()
        if i % 2 == 1 then
            while not turtle.up() do
                if turtle.detect() then
                    turtle.digUp()
                elseif turtle.attack() then
                else
                    sleep(1)
                end
            end
        else
            while not turtle.down() do
                if turtle.detect() then
                    turtle.digDown()
                elseif turtle.attack() then
                else
                    sleep(1)
                end
            end
        end
        local success, data = turtle.inspect()
        if success then
            if data.name ~= 'chisel:marble' then
                replace()
            end
        else
            replace()
        end
        checkForTorch(i,j)
    end
    returnToFloor()
end