Turtle inventory cleaner

inv = peripheral.wrap("left") --or what ever side the antenna is on

--add as many things you want to keep
Keep = {}
Keep[1] = "Redstone"
Keep[2] = "Yellorite Ore"
Keep[3] = "Tin Ore"
Keep[4] = "Copper Ore"
Keep[5] = "Iron Ore"
Keep[6] = "Certus Quartz Crystal"
Keep[7] = "Diamond"

function within(t1, t2)
    for t3,t4 in pairs(t2) do
        if (t1 == t4) then
            return true
        end
    end
end

function clear_inv()
    i = inv.getAllStacks(false)
    for q,w in pairs(i) do
        name = w.display_name
        if (within(name,Keep)) then
            sleep(1)
        elseif (name == "Coal") then
            turtle.refuel(q)
        else inv.destroyStack(q)
        end
    end
    inv.condenseItems()
end

while true do
    clear_inv()
    sleep(3)
end