add typing indicators

Fixes #92

lib/controllers/client.dart

@@ -320,6 +320,11 @@ class ClientController extends AsyncNotifier<int> {
 
   Future<void> logout() => _sendCommand("logout");
 
+  Future<void> setTyping(String roomId, Duration timeout) => _sendCommand(
+    "set_typing",
+    {"room_id": roomId, "timeout": timeout.inMilliseconds},
+  );
+
   Future<void> markRead(Room room) async {
     if (room.timeline.isEmpty || room.metadata == null) return;
     final eventRowId = room.timeline[room.timeline.keys.reduce(max)];

lib/controllers/gomuks_listener.dart

@@ -15,6 +15,7 @@ import "package:nexus/controllers/rooms.dart";
 import "package:nexus/controllers/space_edges.dart";
 import "package:nexus/controllers/sync_status.dart";
 import "package:nexus/controllers/top_level_spaces.dart";
+import "package:nexus/controllers/typing.dart";
 import "package:nexus/helpers/extensions/gomuks_buffer.dart";
 import "package:nexus/main.dart";
 import "package:ffi/ffi.dart";
@@ -63,6 +64,10 @@ class GomuksListenerController extends AsyncNotifier<void> {
                         event.roomId: .new(events: .new({event.rowId: event})),
                       }),
                     );
+              case "typing":
+                ref
+                    .read(TypingController.provider.notifier)
+                    .set(.fromJson(decodedMuksEvent));
               case "events_decrypted":
                 final decrypted = EventsDecrypted.fromJson(decodedMuksEvent);
                 final metadata = ref
@@ -96,6 +101,7 @@ class GomuksListenerController extends AsyncNotifier<void> {
                   ref.invalidate(roomProvider);
                   ref.invalidate(accountDataProvider);
                   ref.invalidate(invitesProvider);
+                  ref.invalidate(TypingController.provider);
                 }
 
                 ref
@@ -153,6 +159,7 @@ class GomuksListenerController extends AsyncNotifier<void> {
         if (paused) {
           GomuksPauseSync(handle);
         } else {
+          ref.invalidate(TypingController.provider);
           GomuksResumeSync(handle);
         }
       }, fireImmediately: true);

lib/controllers/room_typing.dart

@@ -0,0 +1,34 @@
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
+import "package:flutter_riverpod/flutter_riverpod.dart";
+import "package:nexus/controllers/client_state.dart";
+import "package:nexus/controllers/settings.dart";
+import "package:nexus/controllers/typing.dart";
+
+/// The other users typing in a room, or none if typing indicators are hidden
+/// in settings.
+class RoomTypingController(final String roomId)
+    extends Notifier<IList<String>> {
+  @override
+  IList<String> build() {
+    final shouldShow = ref.watch(
+      SettingsController.provider.select(
+        (settings) => settings.value?.typingIndicators != .neither,
+      ),
+    );
+    if (!shouldShow) return const .empty();
+
+    final userId = ref.watch(
+      ClientStateController.provider.select((state) => state?.userId),
+    );
+
+    return ref
+            .watch(TypingController.provider.select((typing) => typing[roomId]))
+            ?.remove(userId ?? "") ??
+        const .empty();
+  }
+
+  static final provider = NotifierProvider.family
+      .autoDispose<RoomTypingController, IList<String>, String>(
+        RoomTypingController.new,
+      );
+}

lib/controllers/settings_sections.dart

@@ -20,6 +20,7 @@ import "package:nexus/helpers/extensions/distributor_name.dart";
 import "package:nexus/models/account_data.dart";
 import "package:nexus/models/room_order.dart";
 import "package:nexus/models/settings_category.dart";
+import "package:nexus/models/typing_indicators.dart";
 import "package:nexus/main.dart";
 import "package:nexus/widgets/settings/dialog_list_tile.dart";
 import "package:nexus/widgets/reset_encryption_sheet.dart";
@@ -183,6 +184,34 @@ class SettingsSectionsController
             ),
           ]),
         ),
+        .new(
+          title: "Privacy",
+          icon: Icons.privacy_tip,
+          settings: .new([
+            .new(
+              title: "Typing Indicators",
+              description: "Show when others are typing, and let others see when you're typing.",
+              icon: Icons.keyboard,
+              builder: (title, description, icon) =>
+                  DialogListTile<TypingIndicators>(
+                    icon: Icon(icon),
+                    title: title,
+                    subtitle: Text(description),
+                    value: settings.typingIndicators,
+                    options: TypingIndicators.values,
+                    getName: (option) => switch (option) {
+                      .showAndSend => "Show and send",
+                      .show => "Only show",
+                      .neither => "Neither",
+                    },
+                    onChanged: (value) => ref
+                        .read(SettingsController.provider.notifier)
+                        .set(settings.copyWith(typingIndicators: value))
+                        .onError(showError),
+                  ),
+            ),
+          ]),
+        ),
       ]),
       if (ref.watch(ClientStateController.provider)?.isLoggedIn == true)
         "Account": .new([

lib/controllers/typing.dart

@@ -0,0 +1,15 @@
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
+import "package:flutter_riverpod/flutter_riverpod.dart";
+import "package:nexus/models/typing.dart";
+
+class TypingController extends Notifier<IMap<String, IList<String>>> {
+  @override
+  IMap<String, IList<String>> build() => .new();
+
+  void set(Typing typing) => state = state.add(typing.roomId, typing.userIds);
+
+  static final provider =
+      NotifierProvider<TypingController, IMap<String, IList<String>>>(
+        TypingController.new,
+      );
+}