feat(editor): indentation (#2174)

* switch to default codeblock tab handling

* feat(editor): indentation

apps/client/src/features/editor/extensions/extensions.ts

@@ -10,7 +10,9 @@ import { Typography } from "@tiptap/extension-typography";
 import { TextStyle } from "@tiptap/extension-text-style";
 import { Color } from "@tiptap/extension-color";
 import { Youtube } from "@tiptap/extension-youtube";
-import SlashCommand, { SlashCommandExtension as Command } from "@/features/editor/extensions/slash-command";
+import SlashCommand, {
+  SlashCommandExtension as Command,
+} from "@/features/editor/extensions/slash-command";
 import renderItems from "@/features/editor/components/slash-menu/render-items";
 import getSuggestionItems from "@/features/editor/components/slash-menu/menu-items";
 import { Collaboration, isChangeOrigin } from "@tiptap/extension-collaboration";
@@ -46,6 +48,7 @@ import {
   Subpages,
   Heading,
   Highlight,
+  Indent,
   UniqueID,
   SharedStorage,
   Columns,
@@ -201,6 +204,7 @@ export const mainExtensions = [
     showOnlyWhenEditable: true,
   }),
   TextAlign.configure({ types: ["heading", "paragraph"] }),
+  Indent,
   TaskList,
   TaskItem.configure({
     nested: true,
@@ -311,6 +315,8 @@ export const mainExtensions = [
     view: CodeBlockView,
     //@ts-ignore
     lowlight,
+    enableTabIndentation: true,
+    tabSize: 2,
     HTMLAttributes: {
       spellcheck: false,
     },
@@ -405,7 +411,10 @@ const TEMPLATE_EXCLUDED_SLASH_ITEMS = new Set([
 const TemplateSlashCommand = Command.configure({
   suggestion: {
     items: ({ query }: { query: string }) =>
-      getSuggestionItems({ query, excludeItems: TEMPLATE_EXCLUDED_SLASH_ITEMS }),
+      getSuggestionItems({
+        query,
+        excludeItems: TEMPLATE_EXCLUDED_SLASH_ITEMS,
+      }),
     render: renderItems,
   },
 });

apps/client/src/features/editor/styles/indent.css

@@ -0,0 +1,14 @@
+.ProseMirror {
+  --indent-step: 2rem;
+}
+
+.ProseMirror [data-indent="1"] { padding-inline-start: calc(var(--indent-step) * 1); }
+.ProseMirror [data-indent="2"] { padding-inline-start: calc(var(--indent-step) * 2); }
+.ProseMirror [data-indent="3"] { padding-inline-start: calc(var(--indent-step) * 3); }
+.ProseMirror [data-indent="4"] { padding-inline-start: calc(var(--indent-step) * 4); }
+.ProseMirror [data-indent="5"] { padding-inline-start: calc(var(--indent-step) * 5); }
+.ProseMirror [data-indent="6"] { padding-inline-start: calc(var(--indent-step) * 6); }
+.ProseMirror [data-indent="7"] { padding-inline-start: calc(var(--indent-step) * 7); }
+.ProseMirror [data-indent="8"] { padding-inline-start: calc(var(--indent-step) * 8); }
+.ProseMirror [data-indent="9"] { padding-inline-start: calc(var(--indent-step) * 9); }
+.ProseMirror [data-indent="10"] { padding-inline-start: calc(var(--indent-step) * 10); }

apps/client/src/features/editor/styles/index.css

@@ -13,5 +13,6 @@
 @import "./mention.css";
 @import "./ordered-list.css";
 @import "./highlight.css";
+@import "./indent.css";
 @import "./columns.css";
 @import "./status.css";

apps/server/package.json

@@ -163,10 +163,11 @@
     "rootDir": "src",
     "testRegex": ".*\\.spec\\.ts$",
     "transform": {
+      "happy-dom.+\\.js$": ["babel-jest", { "presets": [["@babel/preset-env", { "targets": { "node": "current" } }]] }],
       "^.+\\.(t|j)s$": "ts-jest"
     },
     "transformIgnorePatterns": [
-      "/node_modules/(?!(\\.pnpm/)?(nanoid|uuid|image-dimensions|marked)(@|/))"
+      "/node_modules/(?!(\\.pnpm/)?(nanoid|uuid|image-dimensions|marked|happy-dom)(@|/))"
     ],
     "collectCoverageFrom": [
       "**/*.(t|j)s"

apps/server/src/collaboration/collaboration.util.ts

@@ -34,6 +34,7 @@ import {
   Mention,
   Subpages,
   Highlight,
+  Indent,
   UniqueID,
   Columns,
   Column,
@@ -62,10 +63,11 @@ export const tiptapExtensions = [
   }),
   Heading,
   UniqueID.configure({
-    types: ['heading', 'paragraph'],
+    types: ['heading', 'paragraph', 'transclusionSource'],
   }),
   Comment,
   TextAlign.configure({ types: ['heading', 'paragraph'] }),
+  Indent,
   TaskList,
   TaskItem.configure({
     nested: true,

apps/server/src/common/helpers/prosemirror/indent-schema.spec.ts

@@ -0,0 +1,63 @@
+import { htmlToJson, jsonToHtml } from '../../../collaboration/collaboration.util';
+
+const findFirstChild = (
+  json: any,
+  type: string,
+): any | undefined => {
+  if (!json || typeof json !== 'object') return undefined;
+  if (json.type === type) return json;
+  if (Array.isArray(json.content)) {
+    for (const child of json.content) {
+      const found = findFirstChild(child, type);
+      if (found) return found;
+    }
+  }
+  return undefined;
+};
+
+describe('indent attribute round-trip', () => {
+  it('parses data-indent on a paragraph into the indent attribute', () => {
+    const html = '<p data-indent="3">Hello</p>';
+    const json = htmlToJson(html);
+    const paragraph = findFirstChild(json, 'paragraph');
+    expect(paragraph).toBeDefined();
+    expect(paragraph.attrs.indent).toBe(3);
+  });
+
+  it('parses data-indent on a heading into the indent attribute', () => {
+    const html = '<h2 data-indent="2">Heading</h2>';
+    const json = htmlToJson(html);
+    const heading = findFirstChild(json, 'heading');
+    expect(heading).toBeDefined();
+    expect(heading.attrs.indent).toBe(2);
+    expect(heading.attrs.level).toBe(2);
+  });
+
+  it('clamps out-of-range data-indent values', () => {
+    const html = '<p data-indent="42">Too deep</p>';
+    const json = htmlToJson(html);
+    const paragraph = findFirstChild(json, 'paragraph');
+    expect(paragraph.attrs.indent).toBe(8);
+  });
+
+  it('renders nonzero indent back to data-indent on HTML serialization', () => {
+    const html = '<p data-indent="4">Round-trip</p>';
+    const json = htmlToJson(html);
+    const out = jsonToHtml(json);
+    expect(out).toContain('data-indent="4"');
+  });
+
+  it('omits data-indent for indent zero', () => {
+    const html = '<p>No indent</p>';
+    const json = htmlToJson(html);
+    const out = jsonToHtml(json);
+    expect(out).not.toContain('data-indent');
+  });
+
+  it('preserves indent through HTML → JSON → HTML', () => {
+    const original = '<p data-indent="5">Five deep</p>';
+    const json = htmlToJson(original);
+    const final = jsonToHtml(json);
+    expect(final).toContain('data-indent="5"');
+  });
+});