Naive persistence of state in URL fragment

src/App.tsx

@@ -1,10 +1,23 @@
 // Portions of this file are Copyright 2021 Google LLC, and licensed under GPL2+. See COPYING.
 
-import React from 'react';
-import SCADEditor from './Editor';
+import React, { useState } from 'react';
+import {State} from './app-state'
+import Editor from '@monaco-editor/react';
 import './App.css';
+import openscadEditorOptions from './language/openscad-editor-options';
+import { writeStateInFragment } from './state';
+
+export function App({initialState}: {initialState: State}) {
+  const [state, rawSetState] = useState(initialState);
+
+  const setState = (state: State) => {
+    rawSetState(state);
+    writeStateInFragment(state);
+  };
+
+  const value = state.source.content;
+  const setValue = (content?: string) => setState({...state, source: {...state.source, content: content ?? ''}});
 
-export function App() {
   return (
     <div className="App">
       <header className="App-header">
@@ -20,9 +33,14 @@ export function App() {
         >
           Learn OpenSCAD
         </a>
-        <SCADEditor height="50vh" value="if (true) sphere(10); else cube();"/>
-
-      </header>
+        <Editor
+            className="openscad-editor"
+            defaultLanguage="openscad"
+            value={value}
+            onChange={setValue}
+            options={openscadEditorOptions}
+            height="50vh"/>
+        </header>
     </div>
   );
 }

src/Editor.tsx

@@ -1,36 +0,0 @@
-// Portions of this file are Copyright 2021 Google LLC, and licensed under GPL2+. See COPYING.
-
-import React from 'react';
-import Editor from '@monaco-editor/react';
-import * as monaco from 'monaco-editor/esm/vs/editor/editor.api';
-const options: monaco.editor.IStandaloneEditorConstructionOptions = {
-  lineNumbers: 'on',
-  automaticLayout: true,
-  scrollBeyondLastLine: false,
-  fontSize: 12,
-  language: 'openscad',
-  wordWrap: 'on',
-  wrappingStrategy: 'advanced',
-  suggest: {
-    // snippetsPreventQuickSuggestions: false,
-    showStatusBar: true,
-    preview: true,
-  },
-  codeLens: true,
-function SCADEditor({value, ...props}: {value: string, height: string}) {
-
-  // let editor: monaco.editor.IStandaloneCodeEditor;
-  
-  // function editorDidMount(e) {
-  //   editor = e;
-  //   console.log('editorDidMount', monaco.languages.getLanguages(), editor);
-    <Editor {...props} className="openscad-editor" defaultLanguage="openscad" value={value} options={options} />
-    // onMount={editorDidMount} />
-  );
-}
-
-// export function createEditor() {
-//   monaco.editor.create(document.getElementById('openscad-editor') as any, options);
-// }
-
-export default SCADEditor;

src/app-state.ts

@@ -0,0 +1,14 @@
+// Portions of this file are Copyright 2021 Google LLC, and licensed under GPL2+. See COPYING.
+
+export interface State {
+  source: {
+    content: string
+  },
+  output?: {
+    path: string,
+    timestamp: number,
+    sizeBytes: number,
+    formattedSize: string,
+  },
+};
+

src/index.tsx

@@ -6,6 +6,8 @@ import reportWebVitals from './reportWebVitals';
 import { createEditorFS } from './filesystem';
 import { registerOpenSCADLanguage } from './language/openscad-register-language';
 import { zipArchives } from './zip-archives';
+import {readStateFromFragment} from './state'
+import { State } from './app-state';
 
 (async () => {
   
@@ -13,12 +15,18 @@ import { zipArchives } from './zip-archives';
   const fs = await createEditorFS(workingDir);
   await registerOpenSCADLanguage(fs, workingDir, zipArchives);
 
+  const initialState = readStateFromFragment() ?? {
+    source: {
+      content: 'cube(1);\ntranslate([0.5, 0.5, 0.5])\n\tcube(1);',
+    }
+  } as State;
+
   const root = ReactDOM.createRoot(
     document.getElementById('root') as HTMLElement
   );
   root.render(
     <React.StrictMode>
-      <App />
+      <App initialState={initialState} />
     </React.StrictMode>
   );
   

src/language/openscad-editor-options.ts

@@ -0,0 +1,50 @@
+// Portions of this file are Copyright 2021 Google LLC, and licensed under GPL2+. See COPYING.
+
+import React from 'react';
+import Editor from '@monaco-editor/react';
+import * as monaco from 'monaco-editor/esm/vs/editor/editor.api';
+
+export default {
+  lineNumbers: 'on',
+  automaticLayout: true,
+  scrollBeyondLastLine: false,
+  fontSize: 12,
+  language: 'openscad',
+  tabSize: 2,
+  wordWrap: 'on',
+  wrappingStrategy: 'advanced',
+  suggest: {
+    // snippetsPreventQuickSuggestions: false,
+    localityBonus: true,
+    showStatusBar: true,
+    preview: true,
+  },
+  codeLens: true,
+  // language: 'javascript',
+  wordBasedSuggestions: false,
+} as monaco.editor.IStandaloneEditorConstructionOptions;
+
+// monaco.editor.IModelContentChangedEvent
+
+// function SCADEditor({input, onInputChanged, ...props}: {input: string, onInputChanged: (value?: string) => void, height: string}) {
+
+//   // let editor: monaco.editor.IStandaloneCodeEditor;
+  
+//   // function editorDidMount(e) {
+//   //   editor = e;
+//   //   console.log('editorDidMount', monaco.languages.getLanguages(), editor);
+//   //   // editor.
+//   //   editor.setModel(monaco.editor.createModel('sphere(123);', 'openscad'));
+//   //   // editor.trigger('anything', 'editor.action.triggerSuggest', {});    
+//   // }
+
+//   return (
+//     <Editor {...props}
+//       className="openscad-editor"
+//       defaultLanguage="openscad"
+//       value={n}
+//       onChange={setValue}
+//       options={options} />
+//     // onMount={editorDidMount} />
+//   );
+// }

src/state.ts

@@ -0,0 +1,17 @@
+// Portions of this file are Copyright 2021 Google LLC, and licensed under GPL2+. See COPYING.
+
+import { State } from "./app-state";
+
+export function writeStateInFragment(state: State) {
+  window.location.hash = encodeURIComponent(JSON.stringify(state));
+}
+export function readStateFromFragment() {
+  if (window.location.hash.startsWith('#') && window.location.hash.length > 1) {
+    try {
+      return JSON.parse(decodeURIComponent(window.location.hash.substring(1)));
+    } catch (e) {
+      console.error(e);
+      return null;
+    }
+  }
+}