if event.type == "program" then
 mem.events = {}
end

if event.type == "item" then
    local name = event.item.name
    if name:find("sapling", 1, true) ~= nil then
      if event.side == "white" then
        digiline_send("treesort",{name="sapling", count=-event.item.count})
        return "green"
      else
        digiline_send("treesort",{name="sapling", count=event.item.count})
        return "white"
      end
    end
    if name:find("fertiliser", 1, true) ~= nil then
      digiline_send("treesort",{name="fertiliser", count=event.item.count})
      return "black"
    end
    return "green"
end