Sag mining program V12

function slice()
    while turtle.detectUp() do
        turtle.digUp()
    end

    turtle.turnRight()
    while turtle.detect() do
        turtle.dig()
    end

    turtle.turnLeft()
    while turtle.detectDown() do
        turtle.digDown()
    end

    turtle.turnLeft()
    while turtle.detect() do
        turtle.dig()
    end

    turtle.turnRight()
    while turtle.detect() do
        turtle.dig()
    end
    turtle.forward()
end

function chest()
    turtle.back()
    if turtle.detectDown() then
        turtle.digDown()
    end
    turtle.select(2)
    turtle.placeDown()
    for i = 16,3,-1 do
        turtle.select(i)
        turtle.dropDown()
    end
    turtle.forward()
end

function torch()
    turtle.select(1)
    turtle.back()
    if turtle.detectDown == false then
        turtle.placeDown()
    else
        turtle.digDown()
        turtle.placeDown()
    end
    turtle.forward()
end

print("1 = torches")
print("2 = chests")
for i=1, 640, 1 do
    if i%13 == 0 then
        torch()
    end
    if turtle.getItemCount(16) > 0 then
        chest()
    end
    slice()
end