add html support

lib/helpers/extension_helper.dart

@@ -1,12 +1,10 @@
 import "package:flutter/material.dart";
-import "package:flutter/widgets.dart";
 import "package:flutter_chat_core/flutter_chat_core.dart";
 import "package:flutter_riverpod/flutter_riverpod.dart";
 import "package:matrix/matrix.dart";
 import "package:nexus/models/full_room.dart";
 import "package:nexus/widgets/error_dialog.dart";
 import "package:nexus/widgets/loading.dart";
-import "package:html2md/html2md.dart";
 
 extension BetterWhen<T> on AsyncValue<T> {
   Widget betterWhen({
@@ -39,6 +37,7 @@ extension ToMessage on Event {
         ? relationshipEventId
         : null;
     final metadata = {
+      "formatted": formattedText.isEmpty ? body : formattedText,
       "eventType": type,
       "displayName": senderFromMemoryOrFallback.displayName,
       "txnId": transactionId,
@@ -49,34 +48,34 @@ extension ToMessage on Event {
         metadata: metadata,
         id: eventId,
         authorId: senderId,
-        text: "~~This message has been redacted.~~",
+        text: "<s>This message has been redacted.</s>",
         deletedAt: redactedBecause?.originServerTs,
       );
     }
 
-    final formatted = convert(
-      formattedText.isEmpty ? body : formattedText,
-      ignore: replyId == null ? null : ["mx-reply"],
-    );
-
-    final asText = Message.text(
-      metadata: metadata,
-      id: eventId,
-      authorId: senderId,
-      text: formatted,
-      replyToMessageId: replyId,
-      deliveredAt: originServerTs,
-    );
+    final asText =
+        Message.text(
+              metadata: metadata,
+              id: eventId,
+              authorId: senderId,
+              text: body,
+              replyToMessageId: replyId,
+              deliveredAt: originServerTs,
+            )
+            as TextMessage;
 
     if (mustBeText) return asText;
 
     return switch (type) {
+      EventTypes.Encrypted => asText.copyWith(
+        text: "Unable to decrypt message.",
+      ),
       EventTypes.Message => switch (messageType) {
         MessageTypes.Image => Message.image(
           metadata: metadata,
           id: eventId,
           authorId: senderId,
-          text: formatted,
+          text: text,
           source: (await getAttachmentUri()).toString(),
           replyToMessageId: replyId,
           deliveredAt: originServerTs,
@@ -85,7 +84,7 @@ extension ToMessage on Event {
           metadata: metadata,
           id: eventId,
           authorId: senderId,
-          text: formatted,
+          text: text,
           replyToMessageId: replyId,
           source: (await getAttachmentUri()).toString(),
           deliveredAt: originServerTs,

lib/helpers/launch_helper.dart

@@ -6,16 +6,16 @@ class LaunchHelper {
   final Ref ref;
   LaunchHelper(this.ref);
 
-  Future<void> launchUrl(Uri url, {bool useWebview = false}) async {
+  Future<bool> launchUrl(Uri url, {bool useWebview = false}) async {
     try {
-      await ul.launchUrl(
+      return await ul.launchUrl(
         url,
         mode: useWebview
             ? ul.LaunchMode.inAppBrowserView
             : ul.LaunchMode.externalApplication,
       );
     } on PlatformException catch (_) {
-      // Ignore missing intent handler error
+      return false;
     }
   }
 

lib/widgets/room_appbar.dart

@@ -38,14 +38,15 @@ class RoomAppbar extends StatelessWidget implements PreferredSizeWidget {
       crossAxisAlignment: CrossAxisAlignment.start,
       children: [
         Text(room.title, overflow: TextOverflow.ellipsis),
-        Text(
-          room.roomData.topic,
-          maxLines: 1,
-          overflow: TextOverflow.ellipsis,
-          style: Theme.of(context).textTheme.labelMedium?.copyWith(
-            color: Theme.of(context).colorScheme.onSurfaceVariant,
+        if (room.roomData.topic.isNotEmpty)
+          Text(
+            room.roomData.topic,
+            maxLines: 1,
+            overflow: TextOverflow.ellipsis,
+            style: Theme.of(context).textTheme.labelMedium?.copyWith(
+              color: Theme.of(context).colorScheme.onSurfaceVariant,
+            ),
           ),
-        ),
       ],
     ),
     actions: [

lib/widgets/room_chat.dart

@@ -17,6 +17,7 @@ import "package:nexus/widgets/chat_box.dart";
 import "package:nexus/widgets/member_list.dart";
 import "package:nexus/widgets/room_appbar.dart";
 import "package:nexus/widgets/top_widget.dart";
+import "package:flutter_widget_from_html_core/flutter_widget_from_html_core.dart";
 
 class RoomChat extends HookConsumerWidget {
   final bool isDesktop;
@@ -122,26 +123,24 @@ class RoomChat extends HookConsumerWidget {
                                     required bool isSentByMe,
                                     MessageGroupStatus? groupStatus,
                                   }) => FlyerChatTextMessage(
+                                    customWidget: HtmlWidget(
+                                      message.metadata?["formatted"],
+                                      customWidgetBuilder: (element) =>
+                                          element.localName == "mx-reply"
+                                          ? SizedBox.shrink()
+                                          : null,
+                                      onTapUrl: (url) => ref
+                                          .watch(LaunchHelper.provider)
+                                          .launchUrl(Uri.parse(url)),
+                                    ),
                                     topWidget: TopWidget(
                                       message,
                                       headers: room.roomData.client.headers,
                                       groupStatus: groupStatus,
                                     ),
-                                    message: message.copyWith(
-                                      text: message.text.replaceAllMapped(
-                                        urlRegex,
-                                        (match) =>
-                                            "[${match.group(0)}](${match.group(0)})",
-                                      ),
-                                    ),
+                                    message: message,
                                     showTime: true,
                                     index: index,
-                                    onLinkTap: (url, _) => ref
-                                        .watch(LaunchHelper.provider)
-                                        .launchUrl(Uri.parse(url)),
-                                    linksDecoration: TextDecoration.underline,
-                                    sentLinksColor: Colors.blue,
-                                    receivedLinksColor: Colors.blue,
                                   ),
                               linkPreviewBuilder: (_, message, isSentByMe) =>
                                   LinkPreview(