tube

local distance = 0
local rings = 80

local function placeitup()
    turtle.dig()
    turtle.place()
    turtle.digUp()
    turtle.up()
end

local function roofit()
    turtle.dig()
    turtle.place()
    turtle.turnLeft()
    turtle.dig()
    turtle.forward()
    turtle.turnRight()
end

local function placeitdown()
    turtle.dig()
    turtle.place()
    turtle.digDown()
    turtle.down()
end

local function floorit()
    turtle.dig()
    turtle.place()
    turtle.turnRight()
    turtle.dig()
    turtle.forward()
    turtle.turnLeft()
end

local function next_ring()

    for i = 1,2 do turtle.turnRight() end
    turtle.dig()
    for i = 1,2 do turtle.turnRight() end
    turtle.back()

end

local function manage_inventory()

    slot = turtle.getSelectedSlot()
    inv_ = turtle.getItemCount(slot)
    if inv_ > 1 then
        turtle.select(slot)
    else
        slot = slot + 1
        turtle.select(slot)
    end

end

local counter = 0
slot = 1

while distance < rings do


    manage_inventory()

    for i = 1,5 do placeitup(); counter = counter + 1 end
    for i = 1,3 do roofit(); counter = counter + 1 end
    for i = 1,5 do placeitdown(); counter = counter + 1 end
    for i = 1,3 do floorit() ; counter = counter + 1 end


    next_ring()

    distance = distance + 1

    -- manage inventory some how

end