Latest code. Working voice, still needs some ui cleanup and accessibility fixes but in decent shape.

hall/hall.go

@@ -676,9 +676,24 @@ func DelClient(c Client) {
 			g.Name(), "delete", c.Id(), c.Username(), nil, nil,
 		)
 	}
+	closeSystemClientsIfNoUsers(g, clients)
 	autoLockKick(g)
 }
 
+func closeSystemClientsIfNoUsers(g *Hall, clients []Client) {
+	var system []Client
+	for _, c := range clients {
+		if member("system", c.Permissions()) {
+			system = append(system, c)
+		} else {
+			return
+		}
+	}
+	for _, c := range system {
+		c.Kick("", nil, "hall is empty")
+	}
+}
+
 func (g *Hall) GetClients(except Client) []Client {
 	g.mu.Lock()
 	defer g.mu.Unlock()