Add prefix to channels from connect window

Fixes #2327

client/js/lounge.js

@@ -361,14 +361,13 @@ $(function() {
 					let value = params[key];
 
 					if (key === "join") {
-						const channels = value.split(",");
-						value = channels.map((c) => {
-							if (c.match(/^\w/)) {
-								return "#" + c;
+						value = value.split(",").map((chan) => {
+							if (!chan.match(/^[#&!+]/)) {
+								return `#${chan}`;
 							}
 
-							return c;
-						}).join(",");
+							return chan;
+						}).join(", ");
 					}
 
 					// \W searches for non-word characters

src/client.js

@@ -177,7 +177,11 @@ Client.prototype.connect = function(args) {
 		channels = args.join
 			.replace(/,/g, " ")
 			.split(/\s+/g)
-			.map(function(chan) {
+			.map((chan) => {
+				if (!chan.match(/^[#&!+]/)) {
+					chan = `#${chan}`;
+				}
+
 				return client.createChannel({
 					name: chan,
 				});