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!7

// works with certain versions of vnstat. Try apt-get install vnstat

module EstimatedMonthlyTrafficPercentage > DynBigNumber {
  start {
    doEvery(0.0, 10*60.0, r updateStats);
  }
  
  void updateStats enter {
    if (getMonthlyTrafficLimit() == 0)
      setValue("Please set traffic limit");
    else if (!isOnPATH('vnstat))
      setValue("vnstat not installed");
    else {
      S s = regexpReplaceWithNothing(",\\d+", parse_vnstat(backtick('vnstat)).thisMonthEstimated);
      long mb;
      if (s.endsWith("MiB")) mb = parseFirstLong(s);
      else if (s.endsWith("GiB")) mb = parseFirstLong(s)*1024;
      else ret with setValue("(?) " + s);
      setValue(intPercentRatio(mb, getMonthlyTrafficLimit()*1024) + " %");
    }
  }

  afterVisualize {
    componentPopupMenuItem(label, "Set traffic limit...", r setLimit);
    onLeftClick(label, r setLimit);
  }
  
  enhanceFrame {
    internalFramePopupMenuItem(f, "Set traffic limit...", r setLimit);
  }
  
  void setLimit enter {
    inputText("Monthly traffic limit (GB, 0 for unknown)", str(getMonthlyTrafficLimit()), voidfunc(S s) {
      setMonthlyTrafficLimit(parseLong(s));
      updateStats();
    });
  }
}