From 2d4409e7aa636a1a82e87d049596dc26768ebbf8 Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Tue, 9 Mar 2021 17:31:12 +0100
Subject: [PATCH] lib/irc: accept tags without value

---
 lib/irc.js | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/lib/irc.js b/lib/irc.js
index 0d90a8f..7c730db 100644
--- a/lib/irc.js
+++ b/lib/irc.js
@@ -52,18 +52,18 @@ function unescapeTag(s) {
 
 export function parseTags(s) {
 	var tags = {};
-	s.split(";").forEach(function(s) {
+	s.split(";").forEach((s) => {
 		if (!s) {
 			return;
 		}
 		var parts = s.split("=", 2);
-		if (parts.length != 2) {
-			throw new Error("expected an equal sign in tag");
-		}
 		var k = parts[0];
-		var v = unescapeTag(parts[1]);
-		if (v.endsWith("\\")) {
-			v = v.slice(0, v.length - 1)
+		var v = null;
+		if (parts.length == 2) {
+			v = unescapeTag(parts[1]);
+			if (v.endsWith("\\")) {
+				v = v.slice(0, v.length - 1)
+			}
 		}
 		tags[k] = v;
 	});
@@ -73,6 +73,10 @@ export function parseTags(s) {
 export function formatTags(tags) {
 	var l = [];
 	for (var k in tags) {
+		if (tags[k] === undefined || tags[k] === null) {
+			l.push(k);
+			continue;
+		}
 		var v = escapeTag(tags[k]);
 		l.push(k + "=" + v);
 	}