From a51be5037d3f32ad09e04bb6c2d0eb745d2fadaa Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Mon, 6 Sep 2021 10:52:06 +0200
Subject: [PATCH] lib/irc: only add colon to trailing arg when necessary

This mirrors go-irc's behavior:

https://github.com/go-irc/irc/blob/7ba1a1858f5ee2a44f18501b486ec11dd1990018/parser.go#L374

Closes: https://todo.sr.ht/~emersion/gamja/103
---
 lib/irc.js | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/lib/irc.js b/lib/irc.js
index 5024e7d..5ee4a9c 100644
--- a/lib/irc.js
+++ b/lib/irc.js
@@ -215,11 +215,14 @@ export function formatMessage(msg) {
 	}
 	s += msg.command;
 	if (msg.params && msg.params.length > 0) {
-		let last = msg.params[msg.params.length - 1];
-		if (msg.params.length > 1) {
-			s += " " + msg.params.slice(0, -1).join(" ");
+		s += " " + msg.params.slice(0, -1).join(" ");
+
+		let last = String(msg.params[msg.params.length - 1]);
+		if (last.length === 0 || last === ":" || last.indexOf(" ") >= 0) {
+			s += " :" + last;
+		} else {
+			s += " " + last;
 		}
-		s += " :" + last;
 	}
 	s += "\r\n";
 	return s;