GitSetup: Add a screen to choose a subFolder

This is only shows if there are subFolders with '.md' files. This
feature is super important for me as it allows me to finally dogfood
this app and use it

This patch just adds the screen, but the subFolder selection
currently doesn't do anything.

lib/appstate.dart

@@ -13,6 +13,7 @@ class AppState {
   bool onBoardingCompleted = false;
 
   // FIXME: Make final
+  /// This is the directory where all the git repos are stored
   String gitBaseDirectory = "";
 
   bool isLoadingFromDisk;

lib/screens/githostsetup_folder.dart

@@ -0,0 +1,76 @@
+import 'package:flutter/material.dart';
+
+import 'githostsetup_button.dart';
+
+class GitHostSetupFolderPage extends StatelessWidget {
+  final List<String> folders;
+  final Function rootFolderSelected;
+  final Function subFolderSelected;
+
+  GitHostSetupFolderPage({
+    @required this.folders,
+    @required this.rootFolderSelected,
+    @required this.subFolderSelected,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    var columns = Column(
+      mainAxisAlignment: MainAxisAlignment.center,
+      crossAxisAlignment: CrossAxisAlignment.start,
+      children: <Widget>[
+        Text(
+          'Would you like to store your journal entries in an existing folder?',
+          style: Theme.of(context).textTheme.title,
+        ),
+        SizedBox(height: 32.0),
+        FolderListWidget(
+          folders: folders,
+          onSelected: subFolderSelected,
+        ),
+        SizedBox(height: 16.0),
+        GitHostSetupButton(
+          text: "Ignore",
+          onPressed: rootFolderSelected,
+        ),
+      ],
+    );
+
+    return Center(
+      child: SingleChildScrollView(
+        child: columns,
+      ),
+    );
+  }
+}
+
+// FIXME: This needs to be made much much prettier!
+class FolderListWidget extends StatelessWidget {
+  final List<String> folders;
+  final Function onSelected;
+
+  FolderListWidget({
+    @required this.folders,
+    @required this.onSelected,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    var buttons = <Widget>[];
+    for (var folderName in folders) {
+      var button = GitHostSetupButton(
+        text: folderName,
+        onPressed: () {
+          onSelected(folderName);
+        },
+      );
+      buttons.add(button);
+    }
+
+    return Column(
+      mainAxisAlignment: MainAxisAlignment.center,
+      crossAxisAlignment: CrossAxisAlignment.start,
+      children: buttons,
+    );
+  }
+}

lib/screens/githostsetup_screens.dart

@@ -14,6 +14,7 @@ import 'githostsetup_autoconfigure.dart';
 import 'githostsetup_button.dart';
 import 'githostsetup_clone.dart';
 import 'githostsetup_clone_url.dart';
+import 'githostsetup_folder.dart';
 import 'githostsetup_sshkey.dart';
 
 class GitHostSetupScreen extends StatefulWidget {
@@ -38,17 +39,16 @@ class GitHostSetupScreenState extends State<GitHostSetupScreen> {
     PageChoice1.Unknown,
   ];
 
-  GitHostType _gitHostType = GitHostType.Unknown;
-
+  var _gitHostType = GitHostType.Unknown;
   var _gitCloneUrl = "";
-  String gitCloneErrorMessage = "";
-
-  String publicKey = "";
+  var gitCloneErrorMessage = "";
+  var publicKey = "";
+  var _subFolders = <String>[];
 
   var pageController = PageController();
   int _currentPageIndex = 0;
 
-  final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();
+  final _scaffoldKey = GlobalKey<ScaffoldState>();
 
   Widget _buildPage(BuildContext context, int pos) {
     print("_buildPage " + pos.toString());
@@ -186,11 +186,35 @@ class GitHostSetupScreenState extends State<GitHostSetupScreen> {
       assert(false);
     }
 
-    assert(_pageChoice[0] != PageChoice0.CustomProvider);
-
     if (pos == 4) {
+      if (_pageChoice[0] == PageChoice0.CustomProvider) {
+        return GitHostSetupFolderPage(
+          folders: _subFolders,
+          subFolderSelected: _subFolderSelected,
+          rootFolderSelected: _finish,
+        );
+      }
+
       if (_pageChoice[1] == PageChoice1.Manual) {
         return GitHostSetupGitClone(errorMessage: gitCloneErrorMessage);
+      } else if (_pageChoice[1] == PageChoice1.Auto) {
+        return GitHostSetupFolderPage(
+          folders: _subFolders,
+          subFolderSelected: _subFolderSelected,
+          rootFolderSelected: _finish,
+        );
+      }
+    }
+
+    assert(_pageChoice[0] != PageChoice0.CustomProvider);
+
+    if (pos == 5) {
+      if (_pageChoice[1] == PageChoice1.Manual) {
+        return GitHostSetupFolderPage(
+          folders: _subFolders,
+          subFolderSelected: _subFolderSelected,
+          rootFolderSelected: _finish,
+        );
       }
     }
 
@@ -371,14 +395,21 @@ class GitHostSetupScreenState extends State<GitHostSetupScreen> {
         );
         gitCloneErrorMessage = error;
       });
-    } else {
-      getAnalytics().logEvent(
-        name: "onboarding_complete",
-        parameters: <String, dynamic>{},
-      );
-      Navigator.pop(context);
-      this.widget.onCompletedFunction();
+      return;
     }
+
+    List<String> subFolders = await _getSubFoldersWithMdFiles(basePath);
+    if (subFolders.isEmpty) {
+      print("Found no subfolders with md files");
+      _finish();
+      return;
+    }
+
+    setState(() {
+      _subFolders = subFolders;
+      _pageCount += 1;
+      _nextPage();
+    });
   }
 
   Future _removeExistingClone(String baseDirPath) async {
@@ -391,6 +422,54 @@ class GitHostSetupScreenState extends State<GitHostSetupScreen> {
       await baseDir.create();
     }
   }
+
+  Future<List<String>> _getSubFoldersWithMdFiles(String baseDirPath) async {
+    var subFolders = <String>[];
+
+    var gitRootDir = Directory(p.join(baseDirPath, "journal"));
+    var lister = gitRootDir.list(recursive: false);
+    await for (var fileEntity in lister) {
+      if (fileEntity is! Directory) {
+        continue;
+      }
+
+      Directory dir = fileEntity;
+      var hasMdFiles = await _hasMdFiles(dir);
+      if (hasMdFiles) {
+        subFolders.add(p.basename(dir.path));
+      }
+    }
+
+    return subFolders;
+  }
+
+  Future<bool> _hasMdFiles(Directory dir) async {
+    var lister = dir.list(recursive: false);
+    await for (var fileEntity in lister) {
+      if (fileEntity is! File) {
+        continue;
+      }
+
+      if (fileEntity.path.toLowerCase().endsWith('.md')) {
+        return true;
+      }
+    }
+
+    return false;
+  }
+
+  void _finish() {
+    getAnalytics().logEvent(
+      name: "onboarding_complete",
+      parameters: <String, dynamic>{},
+    );
+    Navigator.pop(context);
+    this.widget.onCompletedFunction();
+  }
+
+  void _subFolderSelected(String folder) {
+    _finish();
+  }
 }
 
 class GitHostChoicePage extends StatelessWidget {