staircase

dCount = 0
bedrock = false
slot = 1

local function checkInventory()
    if turtle.getItemCount() < 1 then
        slot = slot + 1
        turtle.select(slot)
    end
end

turtle.select(slot)
for x = 1,4 do
    turtle.up()
    dCount = dCount - 1
end

repeat
    for x = 1,4 do
        checkInventory()
        turtle.digUp()
        turtle.dig()
        turtle.digDown()
        if turtle.down() then
            dCount = dCount + 1
            success, bedrock = turtle.inspectDown()
        end
    end
    turtle.dig()
    repeat
        turtle.dig()
    until turtle.forward()

    turtle.turnLeft()
    turtle.turnLeft()
    checkInventory()
    turtle.place()
    turtle.turnLeft()
    turtle.turnLeft()

    for x = 1,3 do
        turtle.up()
        dCount = dCount - 1
    end
until bedrock.name == "minecraft:bedrock"

for x = 1,dCount do
    turtle.back()
    turtle.up()
end