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!7

cmodule GreeterBot > DynTalkBot {
  S msg = "Welcome <user>! Rules and regulations apply. And stuff.";
  long channelToGreetIn;
  
  start {
    useAGIBlueForDropPunctuation = false;
  }
  
  void onUserJoin(long userID, O... _) {
    S msg2 = replace(msg, "<user>", discordAt(userID));
    if (channelToGreetIn == 0) setField(channelToGreetIn := preferredChannelID);
    if (channelToGreetIn == 0) fail("Have no greeting channel"); 
  }
  
  S processSimplifiedLine(S s, O... _) {
    try answer super.processSimplifiedLine(s, _); // adding authorized users etc.
    
    s = dropPrefixOrNull(atSelf() + " ", s);
    if (s == null) null;
    
    if (eqic(s, "prefer this channel")) {
      try answer checkAuth();
      long channelID = longPar channelID(_);
      if (channelID == 0) ret "No channel";
      setField(channelToGreetIn := channelID);
      ret "OK, will greet here from now on.";
    }
    
    if (eqic(s, "simulate greeting")) {
      onUserJoin(longPar userID(_), _);
      ret "Greeting simulated";
    }
    
    if (eqic(s, "get message"))
      ret msg;
      
    if (swic_trim(s, "set message:", m)) {
      setField(msg := m.rest();
      ret "Message changed to: " + msg;
    }
    
    null;
  }
}