QUIT the irc server when the last channel is left

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:
   /**