Parse all CTCP messages

We display them nicely, however we never reply to them.

lib/irc.js

@@ -279,3 +279,28 @@ export function formatDate(date) {
 	var sss = date.getUTCMilliseconds().toString().padStart(3, "0");
 	return `${YYYY}-${MM}-${DD}T${hh}:${mm}:${ss}.${sss}Z`;
 }
+
+export function parseCTCP(msg) {
+	if (msg.command != "PRIVMSG" && msg.command != "NOTICE") {
+		return null;
+	}
+
+	var text = msg.params[1];
+	if (!text.startsWith("\x01")) {
+		return null;
+	}
+	text = text.slice(1);
+	if (text.endsWith("\x01")) {
+		text = text.slice(0, -1);
+	}
+
+	var ctcp;
+	var i = text.indexOf(" ");
+	if (i >= 0) {
+		ctcp = { command: text.slice(0, i), param: text.slice(i + 1) };
+	} else {
+		ctcp = { command: text, param: "" };
+	}
+	ctcp.command = ctcp.command.toUpperCase();
+	return ctcp;
+}