feat: Automatic update subscription

sub/GroupUpdater.cpp

@@ -561,3 +561,53 @@ namespace NekoGui_sub {
         }
     }
 } // namespace NekoGui_sub
+
+bool UI_update_all_groups_Updating = false;
+
+#define should_skip_group(g) (g == nullptr || g->url.isEmpty() || g->archive || (onlyAllowed && g->skip_auto_update))
+
+void serialUpdateSubscription(const QList<int> &groupsTabOrder, int _order, bool onlyAllowed) {
+    // calculate next group
+    int nextOrder = _order;
+    std::shared_ptr<NekoGui::Group> nextGroup;
+    forever {
+        nextOrder += 1;
+        if (nextOrder >= groupsTabOrder.size()) break;
+        auto nextGid = groupsTabOrder[nextOrder];
+        nextGroup = NekoGui::profileManager->GetGroup(nextGid);
+        if (should_skip_group(nextGroup)) continue;
+        break;
+    }
+
+    // calculate this group
+    auto group = NekoGui::profileManager->GetGroup(groupsTabOrder[_order]);
+    if (group == nullptr) {
+        UI_update_all_groups_Updating = false;
+        return;
+    }
+
+    // v2.2: listener is moved to GroupItem, no refresh here.
+    NekoGui_sub::groupUpdater->AsyncUpdate(group->url, group->id, [=] {
+        if (nextGroup == nullptr) {
+            UI_update_all_groups_Updating = false;
+        } else {
+            serialUpdateSubscription(groupsTabOrder, nextOrder, onlyAllowed);
+        }
+    });
+}
+
+void UI_update_all_groups(bool onlyAllowed) {
+    if (UI_update_all_groups_Updating) {
+        MW_show_log("The last subscription update has not exited.");
+        return;
+    }
+    // first: freeze group order
+    auto groupsTabOrder = NekoGui::profileManager->groupsTabOrder;
+    for (const auto &gid: groupsTabOrder) {
+        auto group = NekoGui::profileManager->GetGroup(gid);
+        if (should_skip_group(group)) continue;
+        // start
+        UI_update_all_groups_Updating = true;
+        serialUpdateSubscription(groupsTabOrder, groupsTabOrder.indexOf(gid), onlyAllowed);
+    }
+}