svoid philosophyBot1_addEnableableExtension(PhilosophyBot1 bot, S name, IVF1<PhilosophyBot1> enable) {
  Map<S, IVF1<PhilosophyBot1>> map = cast bot.getExtension("enableableExtensions");
  if (map == null) {
    // first time, register ourselves as an extension
    bot.addExtension("enableableExtensions", map = new Map);
    Map<S, IVF1<PhilosophyBot1>> _map = map;
    bot.addFactPreprocessor(s -> {
      new Matches m;
      if "enable extension *" {
        IVF1<PhilosophyBot1> action = _map.get($1);
        if (action == null) warn("Extension " + $1 + " not found");
        else action.get(bot);
        true;
      }
      false;
    });
  }
  // after that, just add new entry to map
  map.put(name, enable);
}

Began life as a copy of #1027180