Vendor basicSetup

src-web/components/Editor/Editor.css

@@ -36,9 +36,51 @@
 .cm-editor .cm-gutters {
     background-color: hsl(var(--color-gray-50));
     border-right: 0;
+    color: hsl(var(--color-gray-200));
+}
+
+.cm-editor .fold-gutter-icon {
+    height: 1.5em;
+    padding-top: 0.2em;
+    padding-left: 0.4em;
+    padding-right: 0.4em;
+    cursor: pointer;
+    border-radius: 0.2em;
+}
+
+.cm-editor .fold-gutter-icon::after {
+    display: block;
+    width: 0.5em;
+    height: 0.5em;
+    border: 1px solid transparent;
+    border-left-color: currentColor;
+    border-bottom-color: currentColor;
+    transform: rotate(-45deg);
+    content: "";
+}
+
+.cm-editor .fold-gutter-icon[data-open] {
+    padding-top: 0.4em;
+    padding-left: 0.2em;
+}
+
+.cm-editor .fold-gutter-icon[data-open]::after {
+    transform: rotate(-135deg);
+}
+
+.cm-editor .fold-gutter-icon:hover {
+    background-color: hsl(var(--color-gray-100)/0.2);
+    color: hsl(var(--color-gray-400));
+}
+
+.cm-editor.cm-focused .cm-gutters {
     color: hsl(var(--color-gray-300));
 }
 
+.cm-editor .cm-content {
+    padding-top: 0.4rem;
+}
+
 .cm-editor .cm-foldPlaceholder {
     background-color: hsl(var(--color-gray-100));
     border: 1px solid hsl(var(--color-gray-200));

src-web/hooks/useCodemirror.ts

@@ -1,11 +1,40 @@
 import { useEffect, useRef, useState } from 'react';
-import { EditorView, basicSetup } from 'codemirror';
+import { EditorView } from 'codemirror';
 import { javascript } from '@codemirror/lang-javascript';
 import { json } from '@codemirror/lang-json';
 import { html } from '@codemirror/lang-html';
-import { EditorState } from '@codemirror/state';
 import { tags } from '@lezer/highlight';
-import { HighlightStyle, LanguageSupport, syntaxHighlighting } from '@codemirror/language';
+import {
+  bracketMatching,
+  defaultHighlightStyle,
+  foldGutter,
+  foldKeymap,
+  HighlightStyle,
+  indentOnInput,
+  LanguageSupport,
+  syntaxHighlighting,
+} from '@codemirror/language';
+import {
+  crosshairCursor,
+  drawSelection,
+  dropCursor,
+  highlightActiveLine,
+  highlightActiveLineGutter,
+  highlightSpecialChars,
+  keymap,
+  lineNumbers,
+  rectangularSelection,
+} from '@codemirror/view';
+import { defaultKeymap, history, historyKeymap } from '@codemirror/commands';
+import { highlightSelectionMatches, searchKeymap } from '@codemirror/search';
+import {
+  autocompletion,
+  closeBrackets,
+  closeBracketsKeymap,
+  completionKeymap,
+} from '@codemirror/autocomplete';
+import { lintKeymap } from '@codemirror/lint';
+import { EditorState } from '@codemirror/state';
 
 const myHighlightStyle = HighlightStyle.define([
   {
@@ -26,7 +55,45 @@ const syntaxExtensions: Record<string, LanguageSupport> = {
   'text/html': html(),
 };
 
-const extensions = [basicSetup, syntaxHighlighting(myHighlightStyle)];
+const extensions = [
+  lineNumbers(),
+  highlightActiveLineGutter(),
+  highlightSpecialChars(),
+  history(),
+  foldGutter({
+    markerDOM: (open) => {
+      const el = document.createElement('div');
+      el.classList.add('fold-gutter-icon');
+      el.tabIndex = -1;
+      if (open) {
+        el.setAttribute('data-open', '');
+      }
+      return el;
+    },
+  }),
+  drawSelection(),
+  dropCursor(),
+  EditorState.allowMultipleSelections.of(true),
+  indentOnInput(),
+  syntaxHighlighting(defaultHighlightStyle, { fallback: true }),
+  bracketMatching(),
+  closeBrackets(),
+  autocompletion(),
+  rectangularSelection(),
+  crosshairCursor(),
+  highlightActiveLine(),
+  highlightSelectionMatches(),
+  keymap.of([
+    ...closeBracketsKeymap,
+    ...defaultKeymap,
+    ...searchKeymap,
+    ...historyKeymap,
+    ...foldKeymap,
+    ...completionKeymap,
+    ...lintKeymap,
+  ]),
+  syntaxHighlighting(myHighlightStyle),
+];
 
 export default function useCodeMirror({
   value,