.github/workflows/ios.yml

@@ -16,22 +16,24 @@ jobs:
               with:
                   submodules: recursive
 
-            - name: Set up Flutter
-              uses: subosito/flutter-action@v2
+            - name: Lix GHA Installer Action
+              uses: samueldr/lix-gha-installer-action@v2026-02-22
               with:
-                  flutter-version: 3.44.4
-
-            - name: Set up Go
-              uses: actions/setup-go@v6
-              with:
-                  go-version-file: gomuks/go.mod
+                  extra_nix_config: experimental-features = nix-command flakes flake-self-attrs
 
             - name: Build app
               run: |
-                  flutter pub get
-                  dart scripts/generate.dart
-                  flutter pub run build_runner build
-                  flutter build ios --release --no-codesign
+                  nix develop --command bash -c '
+                    set -e
+                    flutter pub get
+                    dart scripts/generate.dart
+                    flutter pub run build_runner build
+
+                    FLUTTER_ROOT="$(dirname "$(dirname "$(readlink -f "$(command -v flutter)")")")"
+                    sudo find -L "$FLUTTER_ROOT" -type d -iname "*.framework" -exec chmod -R u+w {} +
+
+                    flutter build ios --release --no-codesign
+                  '
 
             # Unsigned IPA: SideStore/AltStore re-sign this on-device with the
             # user's own Apple ID at install time, so no certificate is needed here.

.github/workflows/macos.yml

@@ -16,25 +16,27 @@ jobs:
               with:
                   submodules: recursive
 
-            - name: Set up Flutter
-              uses: subosito/flutter-action@v2
+            - name: Lix GHA Installer Action
+              uses: samueldr/lix-gha-installer-action@v2026-02-22
               with:
-                  flutter-version: 3.44.4
-
-            - name: Set up Go
-              uses: actions/setup-go@v6
-              with:
-                  go-version-file: gomuks/go.mod
+                  extra_nix_config: experimental-features = nix-command flakes flake-self-attrs
 
             - name: Build app
               run: |
-                  flutter pub get
-                  dart scripts/generate.dart
-                  flutter pub run build_runner build
-                  flutter build macos --release
+                  nix develop --command bash -c '
+                    set -e
+                    flutter pub get
+                    dart scripts/generate.dart
+                    flutter pub run build_runner build
+
+                    FLUTTER_ROOT="$(dirname "$(dirname "$(readlink -f "$(command -v flutter)")")")"
+                    sudo find -L "$FLUTTER_ROOT" -type d -iname "*.framework" -exec chmod -R u+w {} +
+
+                    flutter build macos --release
+                  '
 
             - name: Upload installer artifact
               uses: actions/upload-artifact@v6
               with:
-                  name: Nexus.App
+                  name: App
                   path: build/macos/Build/Products/Release/Nexus.app

README.md

@@ -15,12 +15,12 @@ A simple and user-friendly Matrix client made with Flutter and a Gomuks backend.
 
 ## Progress
 
-- [x] Platform Support
+- [ ] Platform Support
     - [x] Linux
-    - [x] Windows - Currently has some bugs, due to us not having any developers on Windows. If you want to fix these, get in contact with us though the [Nexus Client Matrix room](https://matrix.to/#/#nexus:federated.nexus).
+    - [x] Windows
     - [x] Android
-    - [x] MacOS - Unsigned .App only
-    - [x] iOS - Unsigned .ipa only
+    - [ ] MacOS ([#50](https://git.federated.nexus/Nexus/nexus/issues/50))
+    - [ ] iOS
     - [ ] Web (may not be possible)
 - [x] Login (via OAuth)
 - [x] Rooms / Spaces
@@ -116,9 +116,6 @@ If you want to try out Nexus, grab one of the following artifacts from CI:
 
 - [Android APK](https://nightly.link/Henry-Hiles/nexus/workflows/android/main/APK.zip)
 - [Windows EXE](https://nightly.link/Henry-Hiles/nexus/workflows/windows/main/windows-installer.zip)
-- [Unsigned iOS IPA](https://nightly.link/Henry-Hiles/nexus/workflows/ios/main/Nexus.ipa.zip)
-- [Unsigned MacOS App](https://nightly.link/Henry-Hiles/nexus/workflows/macos/main/Nexus.App.zip)
-- [Windows EXE](https://nightly.link/Henry-Hiles/nexus/workflows/windows/main/windows-installer.zip)
 - Flatpak
     - [AArch64/Arm64](https://nightly.link/Henry-Hiles/nexus/workflows/flatpak/main/flatpak-aarch64.zip)
     - [x86_64/AMD64](https://nightly.link/Henry-Hiles/nexus/workflows/flatpak/main/flatpak-x86_64.zip)
@@ -129,8 +126,8 @@ If you want to try out Nexus, grab one of the following artifacts from CI:
 
 #### Linux
 
-- On NixOS: Either use direnv and `direnv allow`, or `nix flake develop`
-- On other distros: Install Flutter, Go, Git, Libclang, Libass, MPV, and Glibc. Do not use any Snap packages, they cause various compilation issues.
+- With Nix: Either use direnv and `direnv allow`, or `nix flake develop`
+- Without Nix: Install Flutter, Go, Git, Libclang, Libass, MPV, and Glibc. Do not use any Snap packages, they cause various compilation issues.
 
 #### Windows
 

hook/build.dart

@@ -29,7 +29,6 @@ Future<void> main(List<String> args) => build(args, (input, output) async {
       iosSdk = iosConfig.targetSdk;
       final minVersion = iosConfig.targetVersion;
       iosSdkPath = await getXCodeTool(sdkType: iosSdk.type);
-
       final archTriple = switch (targetArch) {
         Architecture.arm64 => "arm64",
         Architecture.x64 => "x86_64",
@@ -37,7 +36,6 @@ Future<void> main(List<String> args) => build(args, (input, output) async {
           "Unsupported iOS architecture: $targetArch",
         ),
       };
-
       iosTargetTriple = iosSdk == IOSSdk.iPhoneSimulator
           ? "$archTriple-apple-ios$minVersion.0-simulator"
           : "$archTriple-apple-ios$minVersion.0";
@@ -50,7 +48,8 @@ Future<void> main(List<String> args) => build(args, (input, output) async {
       break;
     case OS.macOS:
       libFileName = "libgomuks.dylib";
-      extraEnv = {"SDKROOT": await getXCodeTool()};
+
+      extraEnv = {"CC": await getXCodeTool(findTool: "clang")};
       break;
     case OS.windows:
       libFileName = "libgomuks.dll";

lib/controllers/room_chat.dart

@@ -17,31 +17,27 @@ import "package:nexus/models/room.dart";
 
 class RoomChatController extends AsyncNotifier<IList<Event>?> {
   final String roomId;
-  Future<bool>? _loadingOlder;
   RoomChatController(this.roomId);
 
   @override
   Future<IList<Event>?> build() async {
     final client = ref.watch(ClientController.provider.notifier);
-    final initialRoom = ref.watch(
+    final room = ref.watch(
       RoomsController.provider.select((rooms) => rooms[roomId]),
     );
 
-    if (initialRoom == null) return null;
-    Room room = initialRoom;
+    if (room == null) return null;
 
     if (!room.hasFetchedState) {
       final state = await client.getRoomState(.new(roomId: roomId));
 
       await ref.read(RoomsController.provider.notifier).addState(roomId, state);
-      room = ref.read(RoomsController.provider)[roomId] ?? room;
     }
 
     // While there are under 20 events, try to load more
     // until there's no more or the conditions are met.
     if (room.hasMore && room.timeline.length < 20) {
-      await loadOlder();
-      room = ref.read(RoomsController.provider)[roomId] ?? room;
+      loadOlder();
     }
 
     return room.timeline
@@ -78,22 +74,18 @@ class RoomChatController extends AsyncNotifier<IList<Event>?> {
         ),
       );
 
-  Future<bool> loadOlder() => _loadingOlder ??= _loadOlder().whenComplete(() {
-    _loadingOlder = null;
-  });
-
-  Future<bool> _loadOlder() async {
-    final room = ref.read(RoomsController.provider)[roomId];
-    if (room == null || !room.hasMore) return false;
-
-    final timelineKeys = room.timeline.keys;
+  Future<bool> loadOlder() async {
+    final timelineKeys = ref
+        .read(RoomsController.provider.select((value) => value[roomId]))
+        ?.timeline
+        .keys;
     final response = await ref
         .watch(ClientController.provider.notifier)
         .paginate(
           .new(
             roomId: roomId,
-            maxTimelineId: timelineKeys.isNotEmpty
-                ? timelineKeys.reduce(min)
+            maxTimelineId: timelineKeys?.isNotEmpty == true
+                ? timelineKeys?.reduce(min)
                 : null,
           ),
         );

lib/widgets/room_chat.dart

@@ -72,47 +72,23 @@ class RoomChat extends HookConsumerWidget {
 
     final controllerProvider = RoomChatController.provider(roomId);
     final notifier = ref.watch(controllerProvider.notifier);
+
     final client = ref.watch(ClientController.provider.notifier);
 
+    final listController = useRef(ListController());
     final scrollController = useScrollController();
     final controllerData = ref.watch(controllerProvider);
-    final historyListController = useRef(ListController());
-    final liveListController = useRef(ListController());
-    final timelineCenterKey = useMemoized(GlobalKey.new);
-    final timelineBoundary = useRef<String?>(null);
-    final hasMore = ref.watch(
-      RoomsController.provider.select(
-        (rooms) => rooms[roomId]?.hasMore ?? false,
-      ),
-    );
+
+    final topEventBeforeLoad = useState<String?>(null);
 
     Future<void> jumpToId(String eventId) async {
-      var events = ref.read(controllerProvider).value;
-      while (events?.any((event) => event.eventId == eventId) != true) {
-        final room = ref.read(RoomsController.provider)[roomId];
-        if (room == null || !room.hasMore) return;
-        await notifier.loadOlder();
-        await WidgetsBinding.instance.endOfFrame;
-        events = ref.read(controllerProvider).value;
-      }
-      if (events == null || !scrollController.hasClients) return;
-
-      final sourceIndex = events.indexWhere(
-        (event) => event.eventId == eventId,
+      final index = controllerData.value?.indexWhere(
+        (element) => element.eventId == eventId,
       );
-      final boundaryIndex = events.indexWhere(
-        (event) => event.eventId == timelineBoundary.value,
-      );
-      if (sourceIndex < 0 || boundaryIndex < 0) return;
+      if (index == null) return;
 
-      final listController = sourceIndex <= boundaryIndex
-          ? historyListController.value
-          : liveListController.value;
-      if (!listController.isAttached) return;
-      listController.animateToItem(
-        index: sourceIndex <= boundaryIndex
-            ? boundaryIndex - sourceIndex
-            : sourceIndex - boundaryIndex - 1,
+      listController.value.animateToItem(
+        index: index,
         scrollController: scrollController,
         alignment: 0.5,
         duration: (_) => .new(milliseconds: 700),
@@ -127,11 +103,87 @@ class RoomChat extends HookConsumerWidget {
     }
 
     Future<void> loadOlder() async {
-      if (controllerData case AsyncData(value: final _?)) {
+      if (controllerData case AsyncData(:final value?)) {
+        topEventBeforeLoad.value = value.firstOrNull?.eventId;
         await notifier.loadOlder();
       }
     }
 
+    useEffect(() {
+      ref
+          .read(controllerProvider.future)
+          .then(
+            (_) => WidgetsBinding.instance.addPostFrameCallback((_) {
+              if (scrollController.hasClients) {
+                scrollController.jumpTo(
+                  scrollController.position.maxScrollExtent - .000001,
+                );
+              }
+            }),
+          );
+
+      return null;
+    }, [scrollController.hasClients]);
+
+    useEffect(() {
+      if (controllerData case AsyncData(
+        :final value?,
+      ) when scrollController.hasClients) {
+        if (topEventBeforeLoad.value != null) {
+          WidgetsBinding.instance.addPostFrameCallback((_) {
+            if (scrollController.hasClients) {
+              final index = value.indexWhere(
+                (event) => event.eventId == topEventBeforeLoad.value,
+              );
+              if (index != -1) {
+                listController.value.jumpToItem(
+                  index: index,
+                  scrollController: scrollController,
+                  alignment: 0,
+                );
+              }
+            }
+            topEventBeforeLoad.value = null;
+          });
+        } else if (scrollController.position.atEdge &&
+            scrollController.position.pixels != 0) {
+          WidgetsBinding.instance.addPostFrameCallback((_) {
+            if (scrollController.hasClients) {
+              scrollController.jumpTo(
+                scrollController.position.maxScrollExtent,
+              );
+            }
+          });
+        }
+      }
+
+      return null;
+    }, [controllerData]);
+
+    useEffect(() {
+      Future<void> listener() async {
+        if (!scrollController.hasClients || !scrollController.position.atEdge) {
+          return;
+        }
+
+        final room = ref.watch(
+          RoomsController.provider.select((value) => value[roomId]),
+        );
+        if (room == null) return;
+
+        if (scrollController.position.pixels == 0) {
+          if (room.hasMore) {
+            await loadOlder();
+          }
+        } else {
+          await client.markRead(room);
+        }
+      }
+
+      scrollController.addListener(listener);
+      return () => scrollController.removeListener(listener);
+    }, [roomId, controllerData]);
+
     final composerNode = useFocusNode(
       onKeyEvent: (_, event) {
         if (event is KeyDownEvent && event.logicalKey == .escape) {
@@ -413,117 +465,58 @@ class RoomChat extends HookConsumerWidget {
                         padding: .symmetric(horizontal: 4),
                         child: switch (controllerData) {
                           AsyncData(:final value?) ||
-                          AsyncLoading(:final value?) => Builder(
-                            builder: (_) {
-                              if (value.isEmpty) return nothing;
-                              var boundaryIndex = value.indexWhere(
-                                (event) =>
-                                    event.eventId == timelineBoundary.value,
-                              );
-                              if (boundaryIndex < 0) {
-                                boundaryIndex = value.length - 1;
-                                timelineBoundary.value =
-                                    value[boundaryIndex].eventId;
-                              }
-
-                              final historyLength = boundaryIndex + 1;
-                              final liveLength = value.length - historyLength;
-
-                              int? historyChildIndex(Key key) {
-                                if (key == const ValueKey("history-loader")) {
-                                  return historyLength;
-                                }
-                                if (key is! ValueKey<String>) return null;
-                                final eventIndex = value.indexWhere(
-                                  (event) => event.eventId == key.value,
-                                );
-                                return eventIndex < 0 ||
-                                        eventIndex >= historyLength
-                                    ? null
-                                    : historyLength - eventIndex - 1;
-                              }
-
-                              int? liveChildIndex(Key key) {
-                                if (key is! ValueKey<String>) return null;
-                                final eventIndex = value.indexWhere(
-                                  (event) => event.eventId == key.value,
-                                );
-                                return eventIndex < historyLength
-                                    ? null
-                                    : eventIndex - historyLength;
-                              }
-
-                              Widget eventRow(
-                                Event event,
-                                Event? previousEvent,
-                              ) => HighlightWrapper(
-                                EventRenderer(
-                                  event,
-                                  onTapReply: () => jumpToId(event.replyTo!),
-                                  getEventOptions: getEventOptions,
-                                  isGrouped:
-                                      previousEvent?.content
-                                          is MessageContent &&
-                                      previousEvent?.redactedBy == null &&
-                                      previousEvent?.relationType !=
-                                          "m.replace" &&
-                                      "${event.sender}${event.pmp?.id}" ==
-                                          "${previousEvent?.sender}${previousEvent?.pmp?.id}",
-                                ),
-                                key: ValueKey(event.eventId),
-                                isHighlighted:
-                                    highlightedEvent.value == event.eventId,
-                              );
-
-                              return CustomScrollView(
-                                reverse: true,
-                                center: timelineCenterKey,
-                                keyboardDismissBehavior:
-                                    ScrollViewKeyboardDismissBehavior.onDrag,
-                                controller: scrollController,
-                                slivers: [
-                                  SliverToBoxAdapter(
-                                    child: SizedBox(height: composerSize.value),
-                                  ),
-                                  SuperSliverList.builder(
-                                    listController: liveListController.value,
-                                    itemCount: liveLength,
-                                    findChildIndexCallback: liveChildIndex,
-                                    itemBuilder: (_, index) => eventRow(
-                                      value[historyLength + index],
-                                      value.getOrNull(
-                                        historyLength + index - 1,
-                                      ),
+                          AsyncLoading(:final value?) => CustomScrollView(
+                            keyboardDismissBehavior:
+                                ScrollViewKeyboardDismissBehavior.onDrag,
+                            controller: scrollController,
+                            slivers: [
+                              SliverToBoxAdapter(
+                                child: Padding(
+                                  padding: .symmetric(vertical: 36),
+                                  child: Center(
+                                    child: ElevatedButton(
+                                      onPressed: controllerData is AsyncData
+                                          ? loadOlder
+                                          : null,
+                                      child: Text("Load More"),
                                     ),
                                   ),
-                                  SuperSliverList.builder(
-                                    key: timelineCenterKey,
-                                    listController: historyListController.value,
-                                    itemCount: historyLength + 1,
-                                    findChildIndexCallback: historyChildIndex,
-                                    itemBuilder: (_, index) {
-                                      if (index == historyLength) {
-                                        return _HistoryLoader(
-                                          key: const ValueKey("history-loader"),
-                                          hasMore: hasMore,
-                                          isLoading:
-                                              controllerData is AsyncLoading,
-                                          onLoad: loadOlder,
-                                        );
-                                      }
-                                      final event =
-                                          value[historyLength - index - 1];
-                                      return eventRow(
-                                        event,
-                                        value.getOrNull(
-                                          historyLength - index - 2,
-                                        ),
-                                      );
-                                    },
-                                  ),
-                                ],
-                              );
-                            },
+                                ),
+                              ),
+
+                              SuperSliverList.builder(
+                                listController: listController.value,
+                                itemCount: value.length,
+                                itemBuilder: (_, index) {
+                                  final event = value[index];
+                                  final previousEvent = value.getOrNull(
+                                    index - 1,
+                                  );
+                                  return HighlightWrapper(
+                                    EventRenderer(
+                                      event,
+                                      onTapReply: () =>
+                                          jumpToId(event.replyTo!),
+                                      getEventOptions: getEventOptions,
+                                      isGrouped:
+                                          previousEvent?.content
+                                              is MessageContent &&
+                                          previousEvent?.redactedBy == null &&
+                                          previousEvent?.relationType !=
+                                              "m.replace" &&
+                                          "${event.sender}${event.pmp?.id}" ==
+                                              "${previousEvent?.sender}${previousEvent?.pmp?.id}",
+                                    ),
+                                    isHighlighted:
+                                        highlightedEvent.value == event.eventId,
+                                  );
+                                },
+                              ),
+
+                              SliverPadding(
+                                padding: .only(bottom: composerSize.value),
+                              ),
+                            ],
                           ),
                           AsyncData() => nothing,
                           AsyncLoading() => Loading(),
@@ -571,42 +564,3 @@ class RoomChat extends HookConsumerWidget {
     );
   }
 }
-
-class _HistoryLoader extends HookWidget {
-  final bool hasMore;
-  final bool isLoading;
-  final Future<void> Function() onLoad;
-
-  const _HistoryLoader({
-    required this.hasMore,
-    required this.isLoading,
-    required this.onLoad,
-    super.key,
-  });
-
-  @override
-  Widget build(BuildContext context) {
-    useEffect(() {
-      if (hasMore) {
-        Future.microtask(onLoad);
-      }
-      return null;
-    }, const []);
-
-    return Padding(
-      padding: .symmetric(vertical: 36),
-      child: Center(
-        child: ElevatedButton(
-          onPressed: hasMore && !isLoading ? onLoad : null,
-          child: isLoading
-              ? SizedBox(
-                  height: 20,
-                  width: 20,
-                  child: CircularProgressIndicator(strokeWidth: 2),
-                )
-              : Text(hasMore ? "Load More" : "Start of timeline"),
-        ),
-      ),
-    );
-  }
-}