From 8875924d93cee35b22655922c7fca157c966c978 Mon Sep 17 00:00:00 2001
From: shreyas1599 <shreyasthirumalai@gmail.com>
Date: Tue, 19 Jan 2021 19:16:41 +0530
Subject: [PATCH 1/2] feat: markdown user profile links

---
 lib/widgets/markdown_view.dart | 38 ++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/lib/widgets/markdown_view.dart b/lib/widgets/markdown_view.dart
index c0f2eb7a..3e4b7da4 100644
--- a/lib/widgets/markdown_view.dart
+++ b/lib/widgets/markdown_view.dart
@@ -7,6 +7,10 @@ import 'package:git_touch/widgets/html_view.dart';
 import 'package:provider/provider.dart';
 import 'package:uri/uri.dart';
 import 'package:path/path.dart' as path;
+import 'package:markdown/markdown.dart' as md;
+import 'package:charcode/charcode.dart';
+
+import 'link.dart';
 
 class MarkdownViewData {
   final Future<String> future;
@@ -109,6 +113,18 @@ class MarkdownFlutterView extends StatelessWidget {
     return Container(
       padding: padding,
       child: MarkdownBody(
+        builders: {
+          "userProfileLink": UserProfileLinkElementBuilder(),
+        },
+        extensionSet: md.ExtensionSet(
+          md.ExtensionSet.gitHubFlavored.blockSyntaxes,
+          [
+            UserProfileLink(),
+            md.EmojiSyntax(),
+            md.LinkSyntax(),
+            ...md.ExtensionSet.gitHubFlavored.inlineSyntaxes
+          ],
+        ),
         data: text,
         selectable: true,
         imageBuilder: (uri, title, alt) {
@@ -212,3 +228,25 @@ class MarkdownFlutterView extends StatelessWidget {
     );
   }
 }
+
+class UserProfileLink extends md.InlineSyntax {
+  UserProfileLink() : super(r'[^\s]+ ', startCharacter: $at);
+
+  @override
+  bool onMatch(md.InlineParser parser, Match match) {
+    var alias = match[0].substring(1, match[0].length).trim();
+    parser.addNode(md.Element.text("userProfileLink", alias));
+    return true;
+  }
+}
+
+class UserProfileLinkElementBuilder extends MarkdownElementBuilder {
+  @override
+  Widget visitElementAfter(md.Element element, TextStyle prefferedStyle) {
+    return Link(
+        url: '/github/${element.textContent}',
+        child: Text(
+          '@' + element.textContent,
+        ));
+  }
+}

From 1f156e58e3699f1d76d0ff4360597a9818ff4886 Mon Sep 17 00:00:00 2001
From: shreyas1599 <shreyasthirumalai@gmail.com>
Date: Tue, 19 Jan 2021 21:07:38 +0530
Subject: [PATCH 2/2] fix: username regex

---
 lib/widgets/markdown_view.dart | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/lib/widgets/markdown_view.dart b/lib/widgets/markdown_view.dart
index 3e4b7da4..7c424089 100644
--- a/lib/widgets/markdown_view.dart
+++ b/lib/widgets/markdown_view.dart
@@ -230,12 +230,15 @@ class MarkdownFlutterView extends StatelessWidget {
 }
 
 class UserProfileLink extends md.InlineSyntax {
-  UserProfileLink() : super(r'[^\s]+ ', startCharacter: $at);
+  // github username regex format
+  UserProfileLink()
+      : super(r'\B@([a-z0-9](?:-?[a-z0-9]){0,38})', startCharacter: $at);
 
   @override
   bool onMatch(md.InlineParser parser, Match match) {
-    var alias = match[0].substring(1, match[0].length).trim();
-    parser.addNode(md.Element.text("userProfileLink", alias));
+    var login = match[0].substring(1, match[0].length).trim();
+    md.Node el = md.Element.text("userProfileLink", login);
+    parser.addNode(el);
     return true;
   }
 }
@@ -245,8 +248,6 @@ class UserProfileLinkElementBuilder extends MarkdownElementBuilder {
   Widget visitElementAfter(md.Element element, TextStyle prefferedStyle) {
     return Link(
         url: '/github/${element.textContent}',
-        child: Text(
-          '@' + element.textContent,
-        ));
+        child: Text('@' + element.textContent));
   }
 }