compost.lua

t=turtle

while true do

    t.select(1)
    local c = 64 - t.getItemCount(1)
    t.suckUp(c)
    while true do
        if not t.dropDown(1) then break;end
    end
    t.suckUp(64 - t.getItemCount(1))
    t.select(2)
    t.suckDown()
end