fix: Addition of Prefs code.

packages/katana_cli/lib/command/code/code.dart

@@ -16,6 +16,7 @@ part 'watch.dart';
 part 'value.dart';
 part 'redirect_query.dart';
 part 'boot.dart';
+part 'prefs.dart';
 
 class CodeCliCommand extends CliCommandGroup {
   const CodeCliCommand();
@@ -37,5 +38,6 @@ class CodeCliCommand extends CliCommandGroup {
         "document": CodeDocumentCliCommand(),
         "value": CodeValueCliCommand(),
         "redirect": CodeRedirectQueryCliCommand(),
+        "prefs": CodePrefsCliCommand(),
       };
 }

packages/katana_cli/lib/command/code/group.dart

@@ -20,7 +20,7 @@ class CodeGroupCliCommand extends CliCodeCommand {
 
   @override
   String get description =>
-      "Create a base class for the controller group in `$directory/(filepath).dart`. Create a base class for the controller group in `$directory/(filepath).dart`.";
+      "Create a base class for the controller group in `$directory/(filepath).dart`. コントローラーグループのベースクラスを`$directory/(filepath).dart`に作成します。";
 
   @override
   Future<void> exec(ExecContext context) async {

packages/katana_cli/lib/command/code/prefs.dart

@@ -0,0 +1,76 @@
+part of katana_cli.code;
+
+/// Create a base class for SharedPreferences.
+///
+/// SharedPreferencesのベースクラスを作成します。
+class CodePrefsCliCommand extends CliCodeCommand {
+  /// Create a base class for SharedPreferences.
+  ///
+  /// SharedPreferencesのベースクラスを作成します。
+  const CodePrefsCliCommand();
+
+  @override
+  String get name => "prefs";
+
+  @override
+  String get prefix => "prefs";
+
+  @override
+  String get directory => "prefs";
+
+  @override
+  String get description =>
+      "Create a base class for SharedPreferences in `$directory/prefs.dart`. SharedPreferencesのベースクラスを`$directory/prefs.dart`に作成します。";
+
+  @override
+  Future<void> exec(ExecContext context) async {
+    label("Create a controller group class in `$directory/prefs.dart`.");
+    await generateDartCode("$directory/prefs.dart");
+  }
+
+  @override
+  String import(String path, String baseName, String className) {
+    return """
+// ignore: unused_import, unnecessary_import
+import 'package:flutter/material.dart';
+// ignore: unused_import, unnecessary_import
+import 'package:masamune/masamune.dart';
+
+// ignore: unused_import, unnecessary_import
+import '/main.dart';
+""";
+  }
+
+  @override
+  String header(String path, String baseName, String className) {
+    return """
+part '$baseName.prefs.dart';
+""";
+  }
+
+  @override
+  String body(String path, String baseName, String className) {
+    return r"""
+/// Get SharedPreferences for the app.
+/// 
+/// ```dart
+/// appPrefs.xxx.get();      // Get xxx value.
+/// appPrefs.xxx.set("xxx"); // Set xxx value.
+/// ```
+final appPrefs = Prefs(
+  // TODO: Initial values defined in Prefs are listed here.
+  \${2}
+);
+
+/// Shared Preferences.
+@prefs
+class Prefs with _\$Prefs, ChangeNotifier {
+  factory Prefs({
+    // TODO: Define here the values to be managed in Shared Preferences.
+    \${1}
+  }) = _Prefs;
+  Prefs._();
+}
+""";
+  }
+}