refactor: launch url

lib/models/auth.dart

@@ -237,7 +237,7 @@ class AuthModel with ChangeNotifier {
   void redirectToGithubOauth() {
     _oauthState = nanoid();
     var scope = Uri.encodeComponent('user,repo,read:org');
-    launch(
+    launchUrl(
       'https://github.com/login/oauth/authorize?client_id=$clientId&redirect_uri=gittouch://login&scope=$scope&state=$_oauthState',
     );
   }

lib/screens/issue.dart

@@ -4,7 +4,6 @@ import 'package:git_touch/models/auth.dart';
 import 'package:primer/primer.dart';
 import 'package:provider/provider.dart';
 import 'package:share/share.dart';
-import 'package:url_launcher/url_launcher.dart';
 import '../utils/utils.dart';
 import '../scaffolds/long_list.dart';
 import '../widgets/timeline_item.dart';
@@ -354,7 +353,7 @@ mutation {
             MyAction(
               text: 'Open in Browser',
               onPress: () {
-                launch(payload['url']);
+                launchUrl(payload['url']);
               },
             ),
           ],

lib/screens/organization.dart

@@ -8,7 +8,6 @@ import 'package:git_touch/widgets/entry_item.dart';
 import 'package:git_touch/widgets/repository_item.dart';
 import 'package:git_touch/widgets/table_view.dart';
 import 'package:git_touch/widgets/user_item.dart';
-import 'package:url_launcher/url_launcher.dart';
 import 'package:share/share.dart';
 import 'package:git_touch/models/auth.dart';
 import 'package:provider/provider.dart';
@@ -107,7 +106,7 @@ class OrganizationScreen extends StatelessWidget {
               text: 'Open in Browser',
               onPress: () {
                 if (payload != null) {
-                  launch(payload['url']);
+                  launchUrl(payload['url']);
                 }
               },
             ),
@@ -147,7 +146,7 @@ class OrganizationScreen extends StatelessWidget {
                     leftIconData: Octicons.location,
                     text: Text(payload['location']),
                     onTap: () {
-                      launch('https://www.google.com/maps/place/' +
+                      launchUrl('https://www.google.com/maps/place/' +
                           (payload['location'] as String)
                               .replaceAll(RegExp(r'\s+'), ''));
                     },
@@ -157,7 +156,7 @@ class OrganizationScreen extends StatelessWidget {
                     leftIconData: Octicons.mail,
                     text: Text(payload['email']),
                     onTap: () {
-                      launch('mailto:' + payload['email']);
+                      launchUrl('mailto:' + payload['email']);
                     },
                   ),
                 if (isNotNullOrEmpty(payload['websiteUrl']))
@@ -169,7 +168,7 @@ class OrganizationScreen extends StatelessWidget {
                       if (!url.startsWith('http')) {
                         url = 'http://$url';
                       }
-                      launch(url);
+                      launchUrl(url);
                     },
                   ),
               ],

lib/screens/repository.dart

@@ -14,7 +14,6 @@ import 'package:git_touch/models/theme.dart';
 import 'package:git_touch/screens/commits.dart';
 import 'package:git_touch/screens/object.dart';
 import 'package:share/share.dart';
-import 'package:url_launcher/url_launcher.dart';
 import 'package:git_touch/widgets/repository_item.dart';
 import '../widgets/entry_item.dart';
 import '../screens/issues.dart';
@@ -213,7 +212,7 @@ class RepositoryScreen extends StatelessWidget {
               text: 'Open in Browser',
               onPress: () {
                 if (data != null) {
-                  launch(data[0]['url']);
+                  launchUrl(data[0]['url']);
                 }
               },
             ),

lib/screens/user.dart

@@ -9,14 +9,12 @@ import 'package:git_touch/widgets/table_view.dart';
 import 'package:git_touch/widgets/text_contains_organization.dart';
 import 'package:git_touch/widgets/user_item.dart';
 import 'package:primer/primer.dart';
-import 'package:url_launcher/url_launcher.dart';
 import 'package:share/share.dart';
 import 'package:github_contributions/github_contributions.dart';
 import 'package:git_touch/models/auth.dart';
 import 'package:provider/provider.dart';
 import '../widgets/entry_item.dart';
 import 'package:git_touch/widgets/repository_item.dart';
-import '../widgets/link.dart';
 import '../widgets/action.dart';
 import '../screens/users.dart';
 import '../screens/settings.dart';
@@ -191,7 +189,7 @@ class UserScreen extends StatelessWidget {
                 text: 'Open in Browser',
                 onPress: () {
                   if (data[0] != null) {
-                    launch(data[0]['url']);
+                    launchUrl(data[0]['url']);
                   }
                 },
               ),
@@ -252,7 +250,7 @@ class UserScreen extends StatelessWidget {
                     leftIconData: Octicons.location,
                     text: Text(payload['location']),
                     onTap: () {
-                      launch('https://www.google.com/maps/place/' +
+                      launchUrl('https://www.google.com/maps/place/' +
                           (payload['location'] as String)
                               .replaceAll(RegExp(r'\s+'), ''));
                     },
@@ -262,7 +260,7 @@ class UserScreen extends StatelessWidget {
                     leftIconData: Octicons.mail,
                     text: Text(payload['email']),
                     onTap: () {
-                      launch('mailto:' + payload['email']);
+                      launchUrl('mailto:' + payload['email']);
                     },
                   ),
                 if (isNotNullOrEmpty(payload['websiteUrl']))
@@ -274,7 +272,7 @@ class UserScreen extends StatelessWidget {
                       if (!url.startsWith('http')) {
                         url = 'http://$url';
                       }
-                      launch(url);
+                      launchUrl(url);
                     },
                   ),
               ],

lib/utils/utils.dart

@@ -184,3 +184,13 @@ class PrimerBranchName extends StatelessWidget {
     );
   }
 }
+
+launchUrl(String url) async {
+  if (url == null) return;
+
+  if (await canLaunch(url)) {
+    await launch(url);
+  } else {
+    // TODO: fallback
+  }
+}

lib/widgets/link.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter/cupertino.dart';
+import 'package:git_touch/utils/utils.dart';
 import 'package:provider/provider.dart';
-import 'package:url_launcher/url_launcher.dart';
 import 'package:git_touch/models/theme.dart';
 
 class Link extends StatelessWidget {
@@ -27,7 +27,7 @@ class Link extends StatelessWidget {
       return Provider.of<ThemeModel>(context).pushRoute(context, screenBuilder);
     }
     if (url != null) {
-      launch(url);
+      launchUrl(url);
     }
   }
 

lib/widgets/notification_item.dart

@@ -3,10 +3,8 @@ import 'package:flutter/cupertino.dart';
 import 'package:git_touch/models/notification.dart';
 import 'package:git_touch/models/theme.dart';
 import 'package:primer/primer.dart';
-import 'package:url_launcher/url_launcher.dart';
 import '../utils/utils.dart';
 import '../screens/issue.dart';
-// import '../screens/not_found.dart';
 import 'package:git_touch/models/auth.dart';
 import 'package:provider/provider.dart';
 import 'link.dart';
@@ -115,7 +113,7 @@ class _NotificationItemState extends State<NotificationItem> {
 
             break;
           case 'Release':
-            launch(
+            launchUrl(
                 'https://github.com/${payload.owner}/${payload.name}/releases/tag/${payload.title}');
             break;
           case 'Commit':