initial menu design, simpler patch serialization

lib/snippets/database/menu/MainMenu.ts

@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) SapphireCode - All Rights Reserved
+ * This file is part of Snippeteer which is released under BSD-3-Clause.
+ * See file 'LICENSE' for full license details.
+ * Created by Timo Hocker <timo@scode.ovh>, June 2020
+ */
+
+import { Database } from '../classes/Database';
+import { Menu } from './Menu';
+
+export class MainMenu extends Menu {
+  public constructor (db: Database) {
+    super ('Snippeteer Database');
+    this.register_option ('quit', () => { /* noop */ });
+    this.register_option ('create table', () => {
+      console.log ('table');
+    });
+  }
+}

lib/snippets/database/menu/Menu.ts

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) SapphireCode - All Rights Reserved
+ * This file is part of Snippeteer which is released under BSD-3-Clause.
+ * See file 'LICENSE' for full license details.
+ * Created by Timo Hocker <timo@scode.ovh>, June 2020
+ */
+
+import { StringOption } from '@sapphirecode/console-app';
+
+export class Menu {
+  private _options: Record<string, ()=>void|Promise<void>> = {};
+  private _title: string;
+
+  public constructor (title: string) {
+    this._title = title;
+  }
+
+  public async run (): Promise<void> {
+    const options = Object.keys (this._options);
+    const selected = await (new StringOption ({
+      name:              'menu_select',
+      message:           this._title,
+      sources:           { console: false },
+      exit_on_interrupt: true,
+      preset:            options
+    }))
+      .parse ();
+    if (typeof this._options[selected] !== 'undefined')
+      await new Promise (this._options[selected]);
+  }
+
+  public register_option (name:string, callback:()=>void|Promise<void>): void {
+    this._options[name] = callback;
+  }
+}