added new function and classes for irc support

src/providers/irc/Irc2.hpp

@@ -1,7 +1,11 @@
 #pragma once
 
+#include <rapidjson/rapidjson.h>
 #include <common/SignalVector.hpp>
 
+#include "providers/irc/IrcChannel2.hpp"
+#include "providers/irc/IrcServer.hpp"
+
 class QAbstractTableModel;
 
 namespace chatterino {
@@ -31,8 +35,20 @@ public:
     UnsortedSignalVector<IrcConnection_> connections;
     QAbstractTableModel *newConnectionModel(QObject *parent);
 
+    IrcServer *getServerOfChannel(Channel *channel);
+    ChannelPtr getOrAddChannel(int serverId, QString name);
+
 signals:
     void connectionUpdated(int id);
+
+private:
+    // Servers have a unique id.
+    // When a server gets changed it gets removed and then added again.
+    // So we store the channels of that server in abandonedChannels_ temporarily.
+    // Or if the server got removed permanently then it's still stored there.
+    std::unordered_map<int, std::unique_ptr<IrcServer>> servers_;
+    std::unordered_map<int, std::vector<std::weak_ptr<Channel>>>
+        abandonedChannels_;
 };
 
 }  // namespace chatterino