Stub out story/controls and use code-mirror with vim for text-editing

src/ui/App.tsx

@@ -1,26 +1,20 @@
 import { createSignal } from 'solid-js';
-import { ExprREPL } from './REPL';
-
-function Hello() {
-  const [ count, setCount ] = createSignal(0);
-
-  return (
-    <div>
-      { count() > 5 ? <span style={{ color: "red" }}>too damn high</span> : <span>{ count() }</span> }
-      <div>
-        <button onClick={ () => setCount((x: number) => x + 1) }>+</button>
-        <button onClick={ () => setCount((x: number) => Math.max(x - 1, 0)) }>-</button>
-      </div>
-    </div>
-  );
-}
+import { Story } from './Story';
+import { Controls } from './Controls';
 
 export default function App() {
-
   return (
-    <div>
-      <Hello />
-      <ExprREPL />
-    </div>
+    <main
+      class="container"
+      style={{
+        display: "grid",
+        "grid-template-columns": "2fr 1fr",
+        gap: "2rem",
+        "margin-top": "2rem",
+      }}
+    >
+      <Story />
+      <Controls />
+    </main>
   );
 }

src/ui/CodeEditor.tsx

@@ -0,0 +1,67 @@
+import { onMount, onCleanup } from "solid-js";
+import { EditorView, basicSetup } from "codemirror";
+import { EditorState } from "@codemirror/state";
+import { oneDark } from "@codemirror/theme-one-dark";
+import { vim } from "@replit/codemirror-vim";
+
+export interface EditorProps {
+  value: string,
+  onUpdate(val: string): void,
+  onRun(): void,
+  height?: string,
+}
+
+export function CodeEditor(props: EditorProps) {
+  let containerRef: HTMLDivElement | undefined;
+  let view: EditorView;
+
+  const handleKeydown = (e: KeyboardEvent) => {
+    if (e.key === "Enter" && (e.ctrlKey || e.metaKey)) {
+      e.preventDefault();
+      e.stopImmediatePropagation(); 
+      props.onRun();
+    }
+  };
+
+  onMount(() => {
+    const themeConfig = EditorView.theme({
+      "&": { height: props.height || "300px" },
+      ".cm-scroller": { overflow: "auto" }
+    });
+
+    const state = EditorState.create({
+      doc: props.value,
+      extensions: [
+        basicSetup,
+        oneDark,
+        vim(),
+        themeConfig,
+        EditorView.updateListener.of((update) => {
+          if (update.docChanged) {
+            props.onUpdate(update.state.doc.toString());
+          }
+        }),
+      ],
+    });
+
+    view = new EditorView({
+      state,
+      parent: containerRef!,
+    });
+
+    containerRef?.addEventListener("keydown", handleKeydown, { capture: true });
+  });
+
+  onCleanup(() => {
+    containerRef?.removeEventListener("keydown", handleKeydown, { capture: true });
+    view.destroy()
+  });
+
+  return (
+    <div 
+      ref={containerRef} 
+      class="editor-frame"
+    />
+  );
+}
+

src/ui/Controls.tsx

@@ -0,0 +1,34 @@
+
+type Props = {
+  // TODO
+}
+
+export function Controls(props: Props) {
+  return (
+    <aside
+      style={{
+        position: "sticky", 
+        top: "2rem", 
+        height: "fit-content"
+      }}
+    >
+      <article>
+        <header>Controls</header>
+
+        <fieldset>
+          <label>
+            <input type="checkbox" role="switch" checked />
+            Auto-evaluate
+          </label>
+          <button class="secondary outline" style={{ width: "100%" }}>
+            Clear All
+          </button>
+        </fieldset>
+
+        <footer>
+          <small>Language v0.1.0</small>
+        </footer>
+      </article>
+    </aside>
+  );
+}

src/ui/REPL.tsx

@@ -7,6 +7,7 @@ import { SourceText, sourceText } from 'src/lang/parser/source_text';
 import { ParseError, parseExpr } from 'src/lang/parser/parser';
 import { ShowParseError } from './ParseError';
 import { Val } from './Value';
+import { CodeEditor } from './CodeEditor';
 
 namespace ReplResult {
   export type Idle =
@@ -55,25 +56,15 @@ export function ExprREPL() {
 
   return (
     <section>
-      <textarea
-        placeholder="+(3, 4)"
-        rows="5"
-        value={input()}
-        onInput={(e) => setInput(e.currentTarget.value)}
-        onKeyDown={(e) => {
-          // Check for Enter + (Ctrl or Command for Mac)
-          if (e.key === "Enter" && (e.ctrlKey || e.metaKey)) {
-            e.preventDefault(); // Stop the newline from being added
-            runExecution();
-          }
-        }}
+      <CodeEditor 
+        value={input()} 
+        onUpdate={setInput} 
+        onRun={runExecution} 
       />
 
       <button onClick={runExecution}>Run</button>
-
-      <hr />
       
-      <div>
+      <div style={{ "margin-top": "1rem" }}>
         <Switch>
           <Match when={result().tag === "idle"}>
             { "" }

src/ui/Story.tsx

@@ -0,0 +1,45 @@
+import { ExprREPL } from "./REPL";
+
+
+type Props = {
+  // TODO
+}
+
+export function Story(props: Props) {
+  return (
+    <div
+      id="story"
+      style={{
+        display: "flex",
+        "flex-direction": "column",
+        gap: "1.5rem",
+      }}
+    >
+      <article>
+        <header><strong>Interactive REPL</strong></header>
+        <ExprREPL />
+      </article>
+
+      <article>
+        <header><strong>Header</strong></header>
+        <p>This is a place for other items</p>
+      </article>
+      <article>
+        <header><strong>Header</strong></header>
+        <p>This is a place for other items</p>
+      </article>
+      <article>
+        <header><strong>Header</strong></header>
+        <p>This is a place for other items</p>
+      </article>
+      <article>
+        <header><strong>Header</strong></header>
+        <p>This is a place for other items</p>
+      </article>
+      <article>
+        <header><strong>Header</strong></header>
+        <p>This is a place for other items</p>
+      </article>
+    </div>
+  );
+}

src/ui/index.scss

@@ -1,3 +1,37 @@
 @use "@picocss/pico/scss/pico";
 
-// Custom styling goes here
+// ===Code-Mirror vim styling===
+.editor-frame {
+  // Pico variable for cards, usually a slightly lighter dark grey
+  background-color: var(--pico-card-background-color);
+  border: 1px solid var(--pico-border-color);
+  border-radius: var(--pico-border-radius);
+  overflow: hidden; // Ensures the editor corners don't poke out
+  margin-bottom: var(--pico-spacing);
+  transition: border-color 0.2s ease-in-out;
+
+  &:focus-within {
+    border-color: var(--pico-primary);
+    box-shadow: 0 0 0 0.125rem rgba(var(--pico-primary-rgb), 0.25);
+  }
+
+  // CodeMirror internal overrides
+  .cm-editor {
+    outline: none !important; // Remove default chrome/safari focus rings
+    font-family: var(--pico-font-family-monospace);
+  }
+
+  // Styling the Vim Command/Status Bar at the bottom
+  .cm-vim-panel {
+    background: #282c34 !important; // One Dark's background
+    color: #abb2bf !important;
+    border-top: 1px solid #181a1f;
+    font-size: 0.8rem;
+    padding: 4px 8px;
+    
+    input {
+      color: var(--pico-primary) !important;
+      font-weight: bold;
+    }
+  }
+}

src/ui/index.tsx

@@ -2,7 +2,6 @@ import './index.scss';
 import { render } from 'solid-js/web';
 import { Program } from 'src/lang/program';
 import { ProgramProvider } from './ProgramProvider';
-// import App from './AppElm';
 import App from './App';
 
 export function startApp() {