QUIT the irc server when the last channel is left

src/bridge/bridge.cpp

@@ -42,7 +42,7 @@ void Bridge::shutdown()
 {
   for (auto it = this->irc_clients.begin(); it != this->irc_clients.end(); ++it)
   {
-    it->second->send_quit_command();
+    it->second->send_quit_command("Gateway shutdown");
   }
 }
 
@@ -193,6 +193,9 @@ void Bridge::send_message(const Iid& iid, const std::string& nick, const std::st
 void Bridge::send_muc_leave(Iid&& iid, std::string&& nick, const std::string& message, const bool self)
 {
   this->xmpp->send_muc_leave(std::move(iid.chan) + "%" + std::move(iid.server), std::move(nick), this->make_xmpp_body(message), this->user_jid, self);
+  IrcClient* irc = this->get_irc_client(iid.server);
+  if (irc && irc->number_of_joined_channels() == 0)
+    irc->send_quit_command("");
 }
 
 void Bridge::send_nick_change(Iid&& iid,

src/irc/irc_client.cpp

@@ -134,9 +134,9 @@ void IrcClient::send_topic_command(const std::string& chan_name, const std::stri
   this->send_message(IrcMessage("TOPIC", {chan_name, topic}));
 }
 
-void IrcClient::send_quit_command()
+void IrcClient::send_quit_command(const std::string& reason)
 {
-  this->send_message(IrcMessage("QUIT", {"gateway shutdown"}));
+  this->send_message(IrcMessage("QUIT", {reason}));
 }
 
 void IrcClient::send_join_command(const std::string& chan_name)
@@ -403,7 +403,6 @@ void IrcClient::on_part(const IrcMessage& message)
       iid.chan = chan_name;
       iid.server = this->hostname;
       bool self = channel->get_self()->nick == nick;
-      this->bridge->send_muc_leave(std::move(iid), std::move(nick), std::move(txt), self);
       if (self)
       {
         channel->joined = false;
@@ -411,6 +410,7 @@ void IrcClient::on_part(const IrcMessage& message)
         // channel pointer is now invalid
         channel = nullptr;
       }
+      this->bridge->send_muc_leave(std::move(iid), std::move(nick), std::move(txt), self);
     }
 }
 
@@ -608,3 +608,8 @@ void IrcClient::on_user_mode(const IrcMessage& message)
                                   std::string("User mode for ") + message.arguments[0] +
                                   " is [" + message.arguments[1] + "]");
 }
+
+size_t IrcClient::number_of_joined_channels() const
+{
+  return this->channels.size();
+}

src/irc/irc_client.hpp

@@ -101,7 +101,7 @@ public:
   /**
    * Send the QUIT irc command
    */
-  void send_quit_command();
+  void send_quit_command(const std::string& reason);
   /**
    * Send a message to the gateway user, not generated by the IRC server,
    * but that might be useful because we want to be verbose (for example we
@@ -186,6 +186,10 @@ public:
    */
   void on_channel_mode(const IrcMessage& message);
   void on_quit(const IrcMessage& message);
+  /**
+   * Return the number of joined channels
+   */
+  size_t number_of_joined_channels() const;
 
 private:
   /**