!752

static S channelID = "C0FH9PY8J"; // relp, #talkingbots
static S token;

static PersistentLog<SlackMsg> msgs;

static new Map<S, S> lastSeenByChannel;

p {
  if (token == null)
    token = loadSecretTextFileMandatory("#1001889", "relp-slack-botstuff-token").trim();
    
  msgs = new PersistentLog<SlackMsg>("msgs");
  for (SlackMsg msg : msgs) {
    S s = lastSeenByChannel.get(msg);
    if (s == null || msg.ts.compareTo(s) > 0)
      lastSeenByChannel.put(channelID, msg.ts);
  }

  while true {
    pcall {
      int limit = 1000;
      L<SlackMsg> newMsgs = slackReadChannel(channelID, token, limit, 
        lastSeenByChannel.get(channelID));
      msgs.addAll(newMsgs);
      if (!newMsgs.isEmpty()) { 
        print(l(newMsgs) + " new messages in " + channelID + ".");
        lastSeenByChannel.put(channelID, last(newMsgs).ts);
      }
    }
    sleepSeconds(5);
  }
}

Began life as a copy of #1001915