fix(nick): nick message sent to all users in user channels

includes/Responses.hpp

@@ -31,6 +31,7 @@ class Channel;
 # define JOIN_MSG(channelName) " JOIN " + (channelName)
 # define KICK_MSG(channelName, kickedUser, comment) " KICK " + (channelName) + " " + (kickedUser) + " :" + (comment)
 # define MODE_MSG(channel, flag, modeParams) " MODE " + (channel) + " " + (flag) + " " + (modeParams)
+# define NICK_MSG(nickname) " NICK " + (nickname)
 # define PART_MSG(channelName) " PART " + (channelName)
 # define PRIVMSG_MSG(destination, message) " PRIVMSG " + (destination) + " :" + (message)
 # define QUIT_MSG(message) " QUIT :" + (message)

src/commands/NickCommand.cpp

@@ -37,13 +37,22 @@ void NickCommand::execute(int clientFd) {
 
     User &user = server.getUserByFd(clientFd);
 
-    if (server.isNicknameInUse(this->_nickname))
+    if (user.getNickname() != this->_nickname && server.isNicknameInUse(this->_nickname))
         throw NicknameInUseException(this->_nickname);
 
     if (!NickCommand::isValidNickname())
         throw ErroneousNicknameException(this->_nickname);
 
+    if (user.isRegistered() && user.getNickname() != this->_nickname) {
+        std::vector<Channel> userChannels = server.getChannels();
+        for (std::vector<Channel>::iterator it = userChannels.begin(); it != userChannels.end(); it++) {
+            if (it->isUserOnChannel(user.getNickname()))
+                it->broadcastToChannel(CMD_MSG(user.getNickname(), user.getUsername(), user.getHostname(), NICK_MSG(this->_nickname)));
+        }
+    }
+
     user.setNickname(this->_nickname);
+
     if (!user.isRegistered() && user.canRegister())
         server.attemptUserRegistration(clientFd);
 }