Add Tags sidebar

Fixes #114

This was there because I couldn't figure out how to configure Billing in
iOS, now that it is done, I can have the pro mode in iOS as well.

assets/langs/en.yaml

@@ -54,6 +54,8 @@ screens:
       delete: Delete Folder
       decoration: Folder Name
       empty: Please enter a name
+  tags:
+    title: Tags
 widgets:
   rename:
     yes: Rename

lib/app.dart

@@ -6,6 +6,7 @@ import 'package:firebase_analytics/observer.dart';
 import 'package:flutter/material.dart';
 import 'package:gitjournal/analytics.dart';
 import 'package:gitjournal/screens/folder_listing.dart';
+import 'package:gitjournal/screens/tag_listing.dart';
 import 'package:gitjournal/screens/note_editor.dart';
 import 'package:gitjournal/screens/purchase_screen.dart';
 import 'package:gitjournal/screens/purchase_thankyou_screen.dart';
@@ -293,7 +294,7 @@ class _JournalAppState extends State<JournalApp> {
       //debugShowMaterialGrid: true,
       onGenerateRoute: (settings) {
         var route = settings.name;
-        if (route == '/folders') {
+        if (route == '/folders' || route == '/tags') {
           return PageRouteBuilder(
             settings: settings,
             pageBuilder: (_, __, ___) => _screenForRoute(route, stateContainer),
@@ -320,6 +321,8 @@ class _JournalAppState extends State<JournalApp> {
         return HomeScreen();
       case '/folders':
         return FolderListingScreen();
+      case '/tags':
+        return TagListingScreen();
       case '/settings':
         return SettingsScreen();
       case '/setupRemoteGit':

lib/core/flattened_notes_folder.dart

@@ -2,13 +2,17 @@ import 'package:gitjournal/core/note.dart';
 import 'package:gitjournal/core/notes_folder.dart';
 import 'package:gitjournal/core/notes_folder_notifier.dart';
 
+typedef NotesFilter = bool Function(Note note);
+
 class FlattenedNotesFolder with NotesFolderNotifier implements NotesFolder {
   final NotesFolder _parentFolder;
+  final NotesFilter filter;
+  final String title;
 
   var _notes = <Note>[];
   var _folders = <NotesFolder>[];
 
-  FlattenedNotesFolder(this._parentFolder) {
+  FlattenedNotesFolder(this._parentFolder, {this.filter, this.title}) {
     _addFolder(_parentFolder);
   }
 
@@ -57,11 +61,17 @@ class FlattenedNotesFolder with NotesFolderNotifier implements NotesFolder {
   }
 
   void _noteAdded(int _, Note note) {
+    if (filter != null && !filter(note)) {
+      return;
+    }
     _notes.add(note);
     notifyNoteAdded(-1, note);
   }
 
   void _noteRemoved(int _, Note note) {
+    if (filter != null && !filter(note)) {
+      return;
+    }
     var i = _notes.indexWhere((n) => n.filePath == note.filePath);
     assert(i != -1);
 
@@ -70,7 +80,22 @@ class FlattenedNotesFolder with NotesFolderNotifier implements NotesFolder {
   }
 
   void _noteModified(int i, Note note) {
-    notifyNoteModified(-1, note);
+    if (filter == null) {
+      notifyNoteModified(-1, note);
+      return;
+    }
+
+    if (_notes.contains(note)) {
+      if (filter(note)) {
+        notifyNoteModified(-1, note);
+      } else {
+        _noteRemoved(-1, note);
+      }
+    } else {
+      if (filter(note)) {
+        _noteAdded(-1, note);
+      }
+    }
   }
 
   @override
@@ -97,7 +122,7 @@ class FlattenedNotesFolder with NotesFolderNotifier implements NotesFolder {
   }
 
   @override
-  String get name => "All Notes";
+  String get name => title ?? "All Notes";
 
   @override
   NotesFolderConfig get config {

lib/features.dart

@@ -1,4 +1,3 @@
 class Features {
   static bool perFolderConfig = false;
-  static bool purchaseProModeAvailable = true;
 }

lib/screens/note_editor.dart

@@ -5,7 +5,6 @@ import 'package:collection/collection.dart';
 
 import 'package:gitjournal/core/note.dart';
 import 'package:gitjournal/core/md_yaml_doc.dart';
-import 'package:gitjournal/core/notes_folder.dart';
 import 'package:gitjournal/core/notes_folder_fs.dart';
 import 'package:gitjournal/editors/journal_editor.dart';
 import 'package:gitjournal/editors/markdown_editor.dart';

lib/screens/settings_editors.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/material.dart';
-import 'package:gitjournal/features.dart';
 import 'package:gitjournal/screens/settings_screen.dart';
 import 'package:gitjournal/settings.dart';
 import 'package:gitjournal/screens/settings_widgets.dart';
@@ -48,25 +47,24 @@ class SettingsEditorsScreenState extends State<SettingsEditorsScreen> {
           setState(() {});
         },
       ),
-      if (Features.purchaseProModeAvailable) SettingsHeader("Journal Editor"),
-      if (Features.purchaseProModeAvailable)
-        ProSettingOverlay(
-          child: ListTile(
-            title: const Text("Default Folder"),
-            subtitle: Text(defaultNewFolder),
-            onTap: () async {
-              var destFolder = await showDialog<NotesFolderFS>(
-                context: context,
-                builder: (context) => FolderSelectionDialog(),
-              );
+      SettingsHeader("Journal Editor"),
+      ProSettingOverlay(
+        child: ListTile(
+          title: const Text("Default Folder"),
+          subtitle: Text(defaultNewFolder),
+          onTap: () async {
+            var destFolder = await showDialog<NotesFolderFS>(
+              context: context,
+              builder: (context) => FolderSelectionDialog(),
+            );
 
-              Settings.instance.journalEditordefaultNewNoteFolderSpec =
-                  destFolder != null ? destFolder.pathSpec() : "";
-              Settings.instance.save();
-              setState(() {});
-            },
-          ),
+            Settings.instance.journalEditordefaultNewNoteFolderSpec =
+                destFolder != null ? destFolder.pathSpec() : "";
+            Settings.instance.save();
+            setState(() {});
+          },
         ),
+      ),
     ]);
 
     return Scaffold(

lib/screens/tag_listing.dart

@@ -0,0 +1,59 @@
+import 'dart:collection';
+
+import 'package:flutter/material.dart';
+import 'package:easy_localization/easy_localization.dart';
+import 'package:gitjournal/core/flattened_notes_folder.dart';
+import 'package:gitjournal/core/note.dart';
+import 'package:gitjournal/core/notes_folder_fs.dart';
+import 'package:gitjournal/screens/folder_view.dart';
+import 'package:gitjournal/widgets/app_bar_menu_button.dart';
+import 'package:gitjournal/widgets/app_drawer.dart';
+import 'package:provider/provider.dart';
+import 'package:font_awesome_flutter/font_awesome_flutter.dart';
+
+class TagListingScreen extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    var rootFolder = Provider.of<NotesFolderFS>(context);
+    var allTags = rootFolder.getNoteTagsRecursively();
+    var allTagsSorted = SplayTreeSet<String>.from(allTags);
+
+    var listView = ListView(
+      children: <Widget>[
+        for (var tag in allTagsSorted) _buildTagTile(context, tag),
+      ],
+    );
+
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(tr('screens.tags.title')),
+        leading: GJAppBarMenuButton(),
+      ),
+      body: Scrollbar(child: listView),
+      drawer: AppDrawer(),
+    );
+  }
+
+  Widget _buildTagTile(BuildContext context, String tag) {
+    var theme = Theme.of(context);
+    var titleColor = theme.textTheme.headline1.color;
+
+    return ListTile(
+      leading: FaIcon(FontAwesomeIcons.tag, color: titleColor),
+      title: Text(tag),
+      onTap: () {
+        var route = MaterialPageRoute(builder: (context) {
+          var rootFolder = Provider.of<NotesFolderFS>(context);
+          var folder = FlattenedNotesFolder(
+            rootFolder,
+            filter: (Note n) => n.tags.contains(tag),
+            title: tag,
+          );
+
+          return FolderView(notesFolder: folder);
+        });
+        Navigator.of(context).push(route);
+      },
+    );
+  }
+}

lib/widgets/app_drawer.dart

@@ -2,7 +2,7 @@ import 'dart:io';
 
 import 'package:flutter/material.dart';
 import 'package:flutter_email_sender/flutter_email_sender.dart';
-import 'package:gitjournal/features.dart';
+import 'package:font_awesome_flutter/font_awesome_flutter.dart';
 import 'package:gitjournal/settings.dart';
 import 'package:gitjournal/utils/logger.dart';
 import 'package:launch_review/launch_review.dart';
@@ -65,7 +65,7 @@ class AppDrawer extends StatelessWidget {
             ),
           ),
           if (setupGitButton != null) ...[setupGitButton, divider],
-          if (Features.purchaseProModeAvailable && !Settings.instance.proMode)
+          if (!Settings.instance.proMode)
             _buildDrawerTile(
               context,
               icon: Icons.power,
@@ -79,8 +79,7 @@ class AppDrawer extends StatelessWidget {
                 );
               },
             ),
-          if (Features.purchaseProModeAvailable && !Settings.instance.proMode)
-            divider,
+          if (!Settings.instance.proMode) divider,
           _buildDrawerTile(
             context,
             icon: Icons.note,
@@ -95,6 +94,14 @@ class AppDrawer extends StatelessWidget {
             onTap: () => _navTopLevel(context, '/folders'),
             selected: currentRoute == "/folders",
           ),
+          _buildDrawerTile(
+            context,
+            icon: FontAwesomeIcons.tag,
+            isFontAwesome: true,
+            title: "Tags",
+            onTap: () => _navTopLevel(context, '/tags'),
+            selected: currentRoute == "/tags",
+          ),
           divider,
           _buildDrawerTile(
             context,
@@ -205,6 +212,7 @@ class AppDrawer extends StatelessWidget {
     @required IconData icon,
     @required String title,
     @required Function onTap,
+    bool isFontAwesome = false,
     bool selected = false,
   }) {
     var theme = Theme.of(context);
@@ -213,8 +221,12 @@ class AppDrawer extends StatelessWidget {
       color: selected ? theme.accentColor : listTileTheme.textColor,
     );
 
+    var iconW = !isFontAwesome
+        ? Icon(icon, color: textStyle.color)
+        : FaIcon(icon, color: textStyle.color);
+
     var tile = ListTile(
-      leading: Icon(icon, color: textStyle.color),
+      leading: iconW,
       title: Text(title, style: textStyle),
       onTap: onTap,
       selected: selected,