From 2cb323ec31570eaa5d9b7b9d2cd9278dc74098da Mon Sep 17 00:00:00 2001
From: Juliusz Chroboczek <jch@irif.fr>
Date: Sat, 25 Apr 2020 02:01:04 +0200
Subject: [PATCH] Delete empty groups.

---
 group.go | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/group.go b/group.go
index 533c916..252afe4 100644
--- a/group.go
+++ b/group.go
@@ -111,10 +111,7 @@ func addGroup(name string) (*group, error) {
 	return g, nil
 }
 
-func delGroup(name string) bool {
-	groups.mu.Lock()
-	defer groups.mu.Unlock()
-
+func delGroupUnlocked(name string) bool {
 	g := groups.groups[name]
 	if g == nil {
 		return true
@@ -158,6 +155,9 @@ func delClient(c *client) {
 			g.clients =
 				append(g.clients[:i], g.clients[i+1:]...)
 			c.group = nil
+			if len(g.clients) == 0 {
+				delGroupUnlocked(g.name)
+			}
 			return
 		}
 	}