!7

// works with certain versions of vnstat. Try apt-get install vnstat

module EstimatedMonthlyTraffic > DynBigNumber {
  start {
    doEvery(0.0, 60.0, r {
      if (!isOnPATH('vnstat))
        setValue("vnstat not installed");
      else
        setValue(parse_vnstat(backtick('vnstat)).thisMonthEstimated);
    });
  }
}