Add references support

lib/helpers/virtual_directory_helper.dart

@@ -0,0 +1,52 @@
+import 'package:comunic/models/api_request.dart';
+import 'package:flutter/material.dart';
+
+/// Virtual directory helper
+///
+/// @author Pierre Hubert
+
+enum VirtualDirectoryType { USER, GROUP, NONE }
+
+class VirtualDirectoryResult {
+  final VirtualDirectoryType type;
+  final int id;
+
+  const VirtualDirectoryResult({
+    @required this.type,
+    this.id,
+  }) : assert(type != null);
+}
+
+class VirtualDirectoryHelper {
+  /// Find a virtual directory
+  Future<VirtualDirectoryResult> find(String directory) async {
+    final response = await APIRequest(
+        uri: "virtualDirectory/find",
+        needLogin: true,
+        args: {"directory": directory}).exec();
+
+    switch (response.code) {
+      case 404:
+        return VirtualDirectoryResult(type: VirtualDirectoryType.NONE);
+
+      case 200:
+        final id = response.getObject()["id"];
+        final kind = response.getObject()["kind"];
+        switch (kind) {
+          case "user":
+            return VirtualDirectoryResult(
+                type: VirtualDirectoryType.USER, id: id);
+          case "group":
+            return VirtualDirectoryResult(
+                type: VirtualDirectoryType.GROUP, id: id);
+
+          default:
+            throw Exception("Unsupported virtual directory kind: $kind");
+        }
+        break;
+
+      default:
+        throw new Exception("Could not get virtual directory!");
+    }
+  }
+}

lib/ui/routes/home_route.dart

@@ -22,10 +22,6 @@ import 'login_route.dart';
 class HomeRoute extends StatefulWidget {
   @override
   State<StatefulWidget> createState() => _HomeRouteState();
-
-  /// Get current instance of Home controller
-  static HomeController of(BuildContext context) =>
-      context.findAncestorStateOfType<HomeController>();
 }
 
 class CurrPage {
@@ -45,6 +41,11 @@ class CurrPage {
 
 /// Public interface of home controller
 abstract class HomeController extends State<HomeRoute> {
+
+  /// Get current instance of Home controller
+  static HomeController of(BuildContext context) =>
+      context.findAncestorStateOfType<HomeController>();
+
   /// Open a specific group page specified by its [groupID]
   void openGroup(int groupID);
 }

lib/ui/screens/groups_list_screen.dart

@@ -67,7 +67,7 @@ class _GroupsListScreenState extends SafeState<GroupsListScreen> {
                             trailing: IconButton(
                                 icon: Icon(Icons.delete),
                                 onPressed: () => _deleteGroup(g)),
-                            onTap: () => HomeRoute.of(context).openGroup(g.id),
+                            onTap: () => HomeController.of(context).openGroup(g.id),
                           ))
                       .toList(),
                 ),

lib/ui/widgets/text_widget.dart

@@ -1,5 +1,6 @@
 import 'package:comunic/utils/bbcode_parser.dart';
 import 'package:comunic/utils/input_utils.dart';
+import 'package:comunic/utils/navigation_utils.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_emoji/flutter_emoji.dart';
 import 'package:url_launcher/url_launcher.dart';
@@ -32,17 +33,17 @@ class TextWidget extends StatelessWidget {
     if (this.parseBBcode)
       return BBCodeParsedWidget(
         text: content,
-        parseCallback: (style, text) => _parseLinks(text, style),
+        parseCallback: (style, text) => _parseLinks(context, text, style),
       );
 
     // Just parse link
     return RichText(
-      text: TextSpan(children: _parseLinks(content, style)),
+      text: TextSpan(children: _parseLinks(context, content, style)),
     );
   }
 
   /// Sub parse function
-  List<InlineSpan> _parseLinks(String text, TextStyle style) {
+  List<InlineSpan> _parseLinks(BuildContext context, String text, TextStyle style) {
     var buff = StringBuffer();
     final list = new List<InlineSpan>();
 
@@ -78,6 +79,25 @@ class TextWidget extends StatelessWidget {
         buff.write(" ");
       }
 
+      // Check if it is a user reference
+      else if(validateUserReference(word)) {
+        changeWordType();
+
+        list.add(
+          WidgetSpan(
+            child: InkWell(
+              child: Text(
+                word,
+                style: style.copyWith(color: Colors.blueAccent),
+              ),
+              onTap: () => openVirtualDirectory(context, word),
+            ),
+          ),
+        );
+
+        buff.write(" ");
+      }
+
       // Simple word
       else {
         buff.write(word);

lib/utils/input_utils.dart

@@ -27,3 +27,7 @@ bool validateUrl(String url) {
     return false;
   }
 }
+
+/// Validate user reference
+bool validateUserReference(String ref) =>
+    RegExp(r'@[a-zA-Z0-9]+').hasMatch(ref);

lib/utils/navigation_utils.dart

@@ -1,5 +1,9 @@
+import 'package:comunic/helpers/virtual_directory_helper.dart';
+import 'package:comunic/ui/routes/home_route.dart';
 import 'package:comunic/ui/routes/single_post_route.dart';
 import 'package:comunic/ui/routes/user_page_route.dart';
+import 'package:comunic/utils/intl_utils.dart';
+import 'package:comunic/utils/ui_utils.dart';
 import 'package:flutter/material.dart';
 import 'package:meta/meta.dart';
 
@@ -26,3 +30,41 @@ void openPostFullScreen(int postID, BuildContext context) {
   Navigator.of(context)
       .push(MaterialPageRoute(builder: (c) => SinglePostRoute(postID: postID)));
 }
+
+/// Open a virtual directory
+void openVirtualDirectory(BuildContext context, String directory) async {
+  if (directory.startsWith("@")) directory = directory.substring(1);
+
+  try {
+    final result = await VirtualDirectoryHelper().find(directory);
+
+    switch (result.type) {
+      case VirtualDirectoryType.USER:
+        openUserPage(context: context, userID: result.id);
+        break;
+
+      case VirtualDirectoryType.GROUP:
+        HomeController.of(context).openGroup(result.id);
+        break;
+
+      case VirtualDirectoryType.NONE:
+        await showDialog(
+            context: context,
+            builder: (c) => AlertDialog(
+                  title: Text(tr("Error")),
+                  content: Text(tr("Could not find related resource!")),
+                  actions: <Widget>[
+                    MaterialButton(
+                      child: Text(tr("OK")),
+                      onPressed: () => Navigator.of(c).pop(),
+                    )
+                  ],
+                ));
+        break;
+    }
+  } catch (e, stack) {
+    print(e);
+    print(stack);
+    showSimpleSnack(context, tr("Could not search virtual directory!"));
+  }
+}