Add Folder creation

Folders for now can only be created under the root folder. I cannot seem
to figure out how to design a good interface for designing how to choose
the parent folder.

lib/core/notes_folder.dart

@@ -1,5 +1,6 @@
 import 'dart:io';
 
+import 'package:path/path.dart' as p;
 import 'package:path/path.dart';
 
 import 'note.dart';
@@ -107,4 +108,19 @@ class NotesFolder {
 
     entities.removeAt(i);
   }
+
+  void create() {
+    // Git doesn't track Directories, only files, so we create an empty .gitignore file
+    // in the directory instead.
+    var gitIgnoreFilePath = p.join(folderPath, ".gitignore");
+    var file = File(gitIgnoreFilePath);
+    if (!file.existsSync()) {
+      file.createSync(recursive: true);
+    }
+  }
+
+  void addFolder(NotesFolder folder) {
+    assert(folder.parent == this);
+    entities.add(NoteFSEntity(folder: folder));
+  }
 }

lib/screens/folder_listing.dart

@@ -33,6 +33,79 @@ class FolderListingScreen extends StatelessWidget {
       ),
       body: treeView,
       drawer: AppDrawer(),
+      floatingActionButton: CreateFolderButton(),
+    );
+  }
+}
+
+class CreateFolderButton extends StatefulWidget {
+  @override
+  _CreateFolderButtonState createState() => _CreateFolderButtonState();
+}
+
+class _CreateFolderButtonState extends State<CreateFolderButton> {
+  final TextEditingController _textController = TextEditingController();
+
+  @override
+  Widget build(BuildContext context) {
+    return FloatingActionButton(
+      key: const ValueKey("FAB"),
+      onPressed: () async {
+        var folderName =
+            await showDialog(context: context, builder: _buildAlert);
+        if (folderName is String) {
+          final container = StateContainer.of(context);
+          final appState = container.appState;
+
+          container.createFolder(appState.notesFolder, folderName);
+        }
+      },
+      child: Icon(Icons.add),
+    );
+  }
+
+  @override
+  void dispose() {
+    _textController.dispose();
+    super.dispose();
+  }
+
+  Widget _buildAlert(BuildContext context) {
+    var form = Form(
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: <Widget>[
+          TextFormField(
+            decoration: const InputDecoration(labelText: 'Folder Name'),
+            validator: (value) {
+              if (value.isEmpty) return 'Please enter a name';
+              return "";
+            },
+            autofocus: true,
+            keyboardType: TextInputType.text,
+            textCapitalization: TextCapitalization.words,
+            controller: _textController,
+          ),
+        ],
+      ),
+    );
+
+    return AlertDialog(
+      title: const Text("Create new Folder"),
+      actions: <Widget>[
+        FlatButton(
+          onPressed: () => Navigator.of(context).pop(false),
+          child: const Text("Discard"),
+        ),
+        FlatButton(
+          onPressed: () {
+            var newFolderName = _textController.text;
+            return Navigator.of(context).pop(newFolderName);
+          },
+          child: const Text("Create"),
+        ),
+      ],
+      content: form,
     );
   }
 }

lib/state_container.dart

@@ -144,6 +144,22 @@ class StateContainerState extends State<StateContainer> {
     });
   }
 
+  void createFolder(NotesFolder parent, String folderName) async {
+    var newFolderPath = p.join(parent.folderPath, folderName);
+    var newFolder = NotesFolder(parent, newFolderPath);
+    newFolder.create();
+
+    Fimber.d("Created New Folder: " + newFolderPath);
+    parent.addFolder(newFolder);
+
+    setState(() {
+      // Update the git repo
+      noteRepo.addFolder(newFolder).then((NoteRepoResult _) {
+        _syncNotes();
+      });
+    });
+  }
+
   void addNote(Note note) {
     insertNote(0, note);
   }

lib/storage/git_storage.dart

@@ -4,6 +4,7 @@ import 'package:fimber/fimber.dart';
 import 'package:flutter/foundation.dart';
 import 'package:gitjournal/apis/git.dart';
 import 'package:gitjournal/core/note.dart';
+import 'package:gitjournal/core/notes_folder.dart';
 import 'package:gitjournal/settings.dart';
 import 'package:path/path.dart' as p;
 
@@ -50,6 +51,15 @@ class GitNoteRepository {
     return NoteRepoResult(noteFilePath: note.filePath, error: false);
   }
 
+  Future<NoteRepoResult> addFolder(NotesFolder folder) async {
+    await _gitRepo.add(".");
+    await _gitRepo.commit(
+      message: "Created new folder",
+    );
+
+    return NoteRepoResult(noteFilePath: folder.folderPath, error: false);
+  }
+
   Future<NoteRepoResult> removeNote(String noteFilePath) async {
     var gitDir = p.join(baseDirectory, dirName);
     var pathSpec = noteFilePath.replaceFirst(gitDir, "").substring(1);