add back/forward history to tabs

also lots of reformatting in .cmake because clion is weird and did that for some reason

src/components/channeltabswitcherhandy.cpp

@@ -57,6 +57,7 @@ void ChannelTabSwitcherHandy::AddChannelTab(Snowflake id) {
 
     CheckUnread(id);
     CheckPageIcon(page, *channel);
+    AppendPageHistory(page, id);
 }
 
 void ChannelTabSwitcherHandy::ReplaceActiveTab(Snowflake id) {
@@ -78,6 +79,7 @@ void ChannelTabSwitcherHandy::ReplaceActiveTab(Snowflake id) {
 
         CheckUnread(id);
         CheckPageIcon(page, *channel);
+        AppendPageHistory(page, id);
     }
 }
 
@@ -103,6 +105,14 @@ void ChannelTabSwitcherHandy::UseTabsState(const TabsState &state) {
     }
 }
 
+void ChannelTabSwitcherHandy::GoBackOnCurrent() {
+    AdvanceOnCurrent(-1);
+}
+
+void ChannelTabSwitcherHandy::GoForwardOnCurrent() {
+    AdvanceOnCurrent(1);
+}
+
 void ChannelTabSwitcherHandy::CheckUnread(Snowflake id) {
     if (auto it = m_pages.find(id); it != m_pages.end()) {
         hdy_tab_page_set_needs_attention(it->second, Abaddon::Get().GetDiscordClient().GetUnreadStateForChannel(id) > -1);
@@ -143,6 +153,41 @@ void ChannelTabSwitcherHandy::CheckPageIcon(HdyTabPage *page, const ChannelData
     hdy_tab_page_set_icon(page, nullptr);
 }
 
+void ChannelTabSwitcherHandy::AppendPageHistory(HdyTabPage *page, Snowflake channel) {
+    auto it = m_page_history.find(page);
+    if (it == m_page_history.end()) {
+        m_page_history[page] = PageHistory { { channel }, 0 };
+        return;
+    }
+
+    // drop everything beyond current position
+    it->second.Visited.resize(++it->second.CurrentVisitedIndex);
+    it->second.Visited.push_back(channel);
+}
+
+void ChannelTabSwitcherHandy::AdvanceOnCurrent(size_t by) {
+    auto *current = hdy_tab_view_get_selected_page(m_tab_view);
+    if (current == nullptr) return;
+    auto history = m_page_history.find(current);
+    if (history == m_page_history.end()) return;
+    if (by + history->second.CurrentVisitedIndex < 0 || by + history->second.CurrentVisitedIndex >= history->second.Visited.size()) return;
+
+    history->second.CurrentVisitedIndex += by;
+    const auto to_id = history->second.Visited.at(history->second.CurrentVisitedIndex);
+
+    // temporarily point current index to the end so that it doesnt fuck up the history
+    // remove it immediately after cuz the emit will call ReplaceActiveTab
+    const auto real = history->second.CurrentVisitedIndex;
+    history->second.CurrentVisitedIndex = history->second.Visited.size() - 1;
+    m_signal_channel_switched_to.emit(to_id);
+    // iterator might not be valid
+    history = m_page_history.find(current);
+    if (history != m_page_history.end()) {
+        history->second.Visited.pop_back();
+    }
+    history->second.CurrentVisitedIndex = real;
+}
+
 ChannelTabSwitcherHandy::type_signal_channel_switched_to ChannelTabSwitcherHandy::signal_channel_switched_to() {
     return m_signal_channel_switched_to;
 }

src/components/channeltabswitcherhandy.hpp

@@ -22,11 +22,16 @@ public:
     TabsState GetTabsState();
     void UseTabsState(const TabsState &state);
 
+    void GoBackOnCurrent();
+    void GoForwardOnCurrent();
+
 private:
     void CheckUnread(Snowflake id);
     void ClearPage(HdyTabPage *page);
     void OnPageIconLoad(HdyTabPage *page, const Glib::RefPtr<Gdk::Pixbuf> &pb);
     void CheckPageIcon(HdyTabPage *page, const ChannelData &data);
+    void AppendPageHistory(HdyTabPage *page, Snowflake channel);
+    void AdvanceOnCurrent(size_t by);
 
     HdyTabBar *m_tab_bar;
     Gtk::Widget *m_tab_bar_wrapped;
@@ -38,6 +43,13 @@ private:
     // need to hold a reference to the pixbuf data
     std::unordered_map<HdyTabPage *, Glib::RefPtr<Gdk::Pixbuf>> m_page_icons;
 
+    struct PageHistory {
+        std::vector<Snowflake> Visited;
+        size_t CurrentVisitedIndex;
+    };
+
+    std::unordered_map<HdyTabPage *, PageHistory> m_page_history;
+
     friend void selected_page_notify_cb(HdyTabView *, GParamSpec *, ChannelTabSwitcherHandy *);
     friend gboolean close_page_cb(HdyTabView *, HdyTabPage *, ChannelTabSwitcherHandy *);
 

src/components/chatwindow.cpp

@@ -180,6 +180,14 @@ TabsState ChatWindow::GetTabsState() {
 void ChatWindow::UseTabsState(const TabsState &state) {
     m_tab_switcher->UseTabsState(state);
 }
+
+void ChatWindow::GoBack() {
+    m_tab_switcher->GoBackOnCurrent();
+}
+
+void ChatWindow::GoForward() {
+    m_tab_switcher->GoForwardOnCurrent();
+}
 #endif
 
 Snowflake ChatWindow::GetActiveChannel() const {

src/components/chatwindow.hpp

@@ -39,6 +39,8 @@ public:
     void OpenNewTab(Snowflake id);
     TabsState GetTabsState();
     void UseTabsState(const TabsState &state);
+    void GoBack();
+    void GoForward();
 #endif
 
 protected: