Add wikilink node with autocomplete (#46)

Introduce Obsidian-style `[[page links]]` (ADR 0004).

- shared: reserved `wikilink` inline atom in the editor schema (attrs
  `targetSlug`, optional `displayText`); markdown mapping `[[slug]]` /
  `[[slug|text]]` via a markdown-it inline rule + serializer node; plain-text
  and HTML derivation include the shown text. Round-trip + parse unit tests.
- web:
  - `Wikilink` node extension with a React NodeView: shows the explicit
    display text or the target's current title (so a rename updates the link),
    renders a missing target as a dashed phantom with a tooltip, navigates on
    click in read mode.
  - `[[` autocomplete popup (`WikilinkAutocomplete`), dependency-free: filters
    the pond's pages as you type with a create-new-page hint for misses,
    Enter/click inserts the node and removes the typed `[[query`; ↑/↓/Enter/Esc
    intercepted in the capture phase so ProseMirror does not act on them.
  - `WikilinkContext` provides the pond's pages (slug→title) for live
    resolution and the autocomplete, populated by the page editor.
  - i18n `editor.wikilink.*` (de + en); wikilink + phantom + popup styles.
- e2e `wikilink.spec.ts` (new CI pack): type `[[`, autocomplete filters and
  inserts a working link that resolves the target title and persists across a
  reload. Phantom → live resolution on page creation is verified in #47.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PGdhRiwU1WRL4XxJfZYipY

.gitea/workflows/ci.yml

@@ -184,6 +184,16 @@ jobs:
           E2E_BASE_URL=http://localhost:5173 \
             pnpm --filter @dorfteich/web exec playwright test e2e/reorder.spec.ts
 
+      - name: Reset login rate limit before wikilink pack
+        run: |
+          echo "DELETE FROM rate_limits WHERE key LIKE 'login%';" | \
+            pnpm --filter @dorfteich/api exec prisma db execute --stdin --url "$DATABASE_URL"
+
+      - name: Run wikilink pack
+        run: |
+          E2E_BASE_URL=http://localhost:5173 \
+            pnpm --filter @dorfteich/web exec playwright test e2e/wikilink.spec.ts
+
       - name: Dump server logs on failure
         if: failure()
         run: tail -50 /tmp/api.log /tmp/collab.log /tmp/web.log || true

apps/web/e2e/wikilink.spec.ts

@@ -0,0 +1,63 @@
+import { expect, test } from '@playwright/test';
+
+import { contextForUser } from './helpers';
+
+/**
+ * Wikilink pack (issue #46). Types `[[` in the editor, verifies the
+ * autocomplete filters and inserts a working link node, and that the link
+ * survives a reload (persisted through the collab server). Language-independent
+ * selectors (CSS classes + page titles). Phantom → live resolution on page
+ * creation is verified in #47.
+ */
+const BASE_URL = process.env.E2E_BASE_URL ?? 'http://localhost:5173';
+
+type Ctx = Awaited<ReturnType<typeof contextForUser>>;
+
+async function personalPond(context: Ctx): Promise<{ id: string; slug: string }> {
+  const ponds = await context.request.get('/api/v1/ponds');
+  const pond = (await ponds.json()).find((p: { type: string }) => p.type === 'personal');
+  return { id: pond.id, slug: pond.slug };
+}
+
+async function createPage(context: Ctx, pondId: string, title: string): Promise<{ slug: string }> {
+  const created = await context.request.post(`/api/v1/ponds/${pondId}/pages`, { data: { title } });
+  return created.json();
+}
+
+test('typing [[ autocompletes and inserts a working wikilink', async ({ browser }) => {
+  const context = await contextForUser(browser, BASE_URL, 'fixture-user');
+  const pond = await personalPond(context);
+  const ts = Date.now();
+  const targetTitle = `Wiki Target ${ts}`;
+  await createPage(context, pond.id, targetTitle);
+  const source = await createPage(context, pond.id, `Wiki Source ${ts}`);
+
+  const page = await context.newPage();
+  await page.goto(`/p/${pond.slug}/${source.slug}`);
+
+  // Enter edit mode and focus the editor body.
+  await page.locator('.editor-page__mode-toggle').click();
+  const body = page.locator('.editor-content .ProseMirror');
+  await expect(body).toBeVisible();
+  await body.click();
+
+  // Type the trigger and part of the target title — the popup filters live.
+  await page.keyboard.type(`[[Wiki Target ${ts}`);
+  const suggest = page.locator('.wikilink-suggest');
+  await expect(suggest).toBeVisible();
+  await expect(suggest.getByText(targetTitle, { exact: true })).toBeVisible();
+
+  // Enter inserts the wikilink node, which renders the target's current title.
+  await page.keyboard.press('Enter');
+  const link = page.locator('.editor-content a.wikilink', { hasText: targetTitle });
+  await expect(link).toBeVisible();
+  // A resolved (existing) target is not phantom.
+  await expect(link).not.toHaveClass(/wikilink--phantom/);
+
+  // Persisted through collaboration: reload and the link is still there.
+  await page.reload();
+  await page.locator('.editor-page__mode-toggle').click();
+  await expect(page.locator('.editor-content a.wikilink', { hasText: targetTitle })).toBeVisible();
+
+  await context.close();
+});

apps/web/src/editor/WikilinkAutocomplete.tsx

@@ -0,0 +1,155 @@
+import { slugify } from '@dorfteich/shared';
+import type { Editor } from '@tiptap/react';
+import { useEffect, useMemo, useRef, useState } from 'react';
+import { useTranslation } from 'react-i18next';
+
+import { useWikilinks } from './wikilink-context';
+
+/** An open `[[` context: the query typed so far and where its `[[` began. */
+interface QueryState {
+  query: string;
+  from: number;
+  coords: { left: number; bottom: number };
+}
+
+/** A suggestion row: an existing page, or a create-phantom hint for a miss. */
+type Suggestion =
+  { kind: 'page'; slug: string; label: string } | { kind: 'create'; slug: string; label: string };
+
+/** Detects a `[[query` immediately before a collapsed cursor (issue #46). */
+function detectQuery(editor: Editor): { query: string; from: number } | null {
+  const { selection } = editor.state;
+  if (!selection.empty) return null;
+  const $from = selection.$from;
+  if (!$from.parent.isTextblock) return null;
+  const start = Math.max(0, $from.parentOffset - 200);
+  const before = $from.parent.textBetween(start, $from.parentOffset, undefined, '');
+  const match = /\[\[([^[\]\n]*)$/.exec(before);
+  if (!match) return null;
+  const query = match[1] ?? '';
+  return { query, from: selection.from - query.length - 2 };
+}
+
+/**
+ * Autocomplete popup for `[[` wikilinks (issue #46). Typing `[[` opens a list
+ * of the current pond's pages filtered by the query (with a create-new-page
+ * hint for misses); Enter/click inserts the wikilink node and removes the typed
+ * `[[query`. Keyboard navigation (↑/↓/Enter/Esc) is intercepted in the capture
+ * phase so ProseMirror does not act on those keys while the popup is open.
+ */
+export function WikilinkAutocomplete({ editor }: { editor: Editor }): React.JSX.Element | null {
+  const { t } = useTranslation('editor');
+  const { targets } = useWikilinks();
+  const [state, setState] = useState<QueryState | null>(null);
+  const [selected, setSelected] = useState(0);
+
+  const suggestions = useMemo<Suggestion[]>(() => {
+    if (!state) return [];
+    const q = state.query.trim().toLowerCase();
+    const pages: Suggestion[] = targets
+      .filter((page) => page.title.toLowerCase().includes(q) || page.slug.toLowerCase().includes(q))
+      .slice(0, 8)
+      .map((page) => ({ kind: 'page', slug: page.slug, label: page.title }));
+    const createSlug = slugify(state.query);
+    if (createSlug && !targets.some((page) => page.slug === createSlug)) {
+      pages.push({ kind: 'create', slug: createSlug, label: state.query.trim() });
+    }
+    return pages;
+  }, [state, targets]);
+
+  // Latest state/suggestions/selection, so the once-attached keydown handler
+  // (below) and click handler both act on current values, not a stale closure.
+  const live = useRef({ state, suggestions, selected });
+  live.current = { state, suggestions, selected };
+
+  function close(): void {
+    setState(null);
+    setSelected(0);
+  }
+
+  function choose(item: Suggestion | undefined): void {
+    const current = live.current.state;
+    if (!item || !current) return;
+    editor
+      .chain()
+      .focus()
+      .insertContentAt({ from: current.from, to: editor.state.selection.from }, [
+        { type: 'wikilink', attrs: { targetSlug: item.slug, displayText: null } },
+        { type: 'text', text: ' ' },
+      ])
+      .run();
+    close();
+  }
+
+  // Recompute the open query on every doc/selection change.
+  useEffect(() => {
+    const update = (): void => {
+      const found = detectQuery(editor);
+      if (!found) {
+        setState(null);
+        return;
+      }
+      const coords = editor.view.coordsAtPos(editor.state.selection.from);
+      setState({ ...found, coords: { left: coords.left, bottom: coords.bottom } });
+      setSelected(0);
+    };
+    editor.on('transaction', update);
+    return () => {
+      editor.off('transaction', update);
+    };
+  }, [editor]);
+
+  // Keyboard navigation, intercepted before ProseMirror (capture phase).
+  useEffect(() => {
+    const dom = editor.view.dom;
+    const onKeyDown = (event: KeyboardEvent): void => {
+      const { state: s, suggestions: items, selected: sel } = live.current;
+      if (!s || items.length === 0) return;
+      if (event.key === 'ArrowDown') {
+        event.preventDefault();
+        setSelected((i) => (i + 1) % items.length);
+      } else if (event.key === 'ArrowUp') {
+        event.preventDefault();
+        setSelected((i) => (i - 1 + items.length) % items.length);
+      } else if (event.key === 'Enter') {
+        event.preventDefault();
+        choose(items[sel]);
+      } else if (event.key === 'Escape') {
+        event.preventDefault();
+        close();
+      }
+    };
+    dom.addEventListener('keydown', onKeyDown, true);
+    return () => dom.removeEventListener('keydown', onKeyDown, true);
+  }, [editor]);
+
+  if (!state || suggestions.length === 0) return null;
+
+  return (
+    <ul
+      className="wikilink-suggest"
+      role="listbox"
+      aria-label={t('wikilink.autocompleteLabel')}
+      style={{ position: 'fixed', left: state.coords.left, top: state.coords.bottom + 4 }}
+    >
+      {suggestions.map((item, index) => (
+        <li key={`${item.kind}:${item.slug}`}>
+          <button
+            type="button"
+            role="option"
+            aria-selected={index === selected}
+            className={
+              index === selected ? 'wikilink-suggest__item is-active' : 'wikilink-suggest__item'
+            }
+            onMouseDown={(event) => {
+              event.preventDefault();
+              choose(item);
+            }}
+          >
+            {item.kind === 'create' ? t('wikilink.createHint', { title: item.label }) : item.label}
+          </button>
+        </li>
+      ))}
+    </ul>
+  );
+}

apps/web/src/editor/document-extensions.ts

@@ -6,6 +6,7 @@ import { Image } from './nodes/image';
 import { BulletList, ListItem, OrderedList, TaskList } from './nodes/lists';
 import { Table, TableCell, TableHeader, TableRow } from './nodes/table';
 import { TaskItem } from './nodes/task-item';
+import { Wikilink } from './nodes/wikilink';
 import {
   Blockquote,
   CodeBlock,
@@ -37,6 +38,7 @@ export const documentExtensions: AnyExtension[] = [
   TaskItem,
   HardBreak,
   Image,
+  Wikilink,
   Table,
   TableRow,
   TableCell,

apps/web/src/editor/nodes/wikilink.tsx

@@ -0,0 +1,62 @@
+import { Node } from '@tiptap/core';
+import { NodeViewWrapper, ReactNodeViewRenderer } from '@tiptap/react';
+import type { NodeViewProps } from '@tiptap/react';
+import { useTranslation } from 'react-i18next';
+import { useNavigate } from 'react-router-dom';
+
+import { attributesFromSpec, nodeSpec } from '../spec-utils';
+import { useWikilinks } from '../wikilink-context';
+
+/**
+ * Renders a `[[wikilink]]` (issue #46): its shown text is the explicit
+ * `displayText` or, when none is set, the target page's current title — so
+ * renaming the target updates the link everywhere. A missing target renders as
+ * a dashed "phantom" with a tooltip and becomes live once the page exists
+ * (resolution is server-side in #47). Click navigates in read mode; in edit
+ * mode the atom just selects (no navigation).
+ */
+function WikilinkView({ node, editor }: NodeViewProps): React.JSX.Element {
+  const { t } = useTranslation('editor');
+  const navigate = useNavigate();
+  const { resolve, pondSlug } = useWikilinks();
+
+  const slug = node.attrs.targetSlug as string;
+  const display = node.attrs.displayText as string | null;
+  const { title, exists } = resolve(slug);
+  const text = display ?? title ?? slug;
+  const editable = editor.isEditable;
+
+  return (
+    <NodeViewWrapper as="span" className="wikilink-nodeview">
+      <a
+        className={exists ? 'wikilink' : 'wikilink wikilink--phantom'}
+        href={`/p/${pondSlug}/${slug}`}
+        title={exists ? undefined : t('wikilink.phantomTooltip')}
+        contentEditable={false}
+        onClick={(event) => {
+          event.preventDefault();
+          // In edit mode a click should not navigate away from the editor.
+          if (!editable) navigate(`/p/${pondSlug}/${slug}`);
+        }}
+      >
+        {text}
+      </a>
+    </NodeViewWrapper>
+  );
+}
+
+const wikilinkSpec = nodeSpec('wikilink');
+export const Wikilink = Node.create({
+  name: 'wikilink',
+  group: wikilinkSpec.group,
+  inline: wikilinkSpec.inline,
+  atom: wikilinkSpec.atom,
+  addAttributes() {
+    return attributesFromSpec(wikilinkSpec);
+  },
+  parseHTML: () => wikilinkSpec.parseDOM,
+  renderHTML: ({ node }) => wikilinkSpec.toDOM!(node),
+  addNodeView() {
+    return ReactNodeViewRenderer(WikilinkView);
+  },
+});

apps/web/src/editor/wikilink-context.tsx

@@ -0,0 +1,53 @@
+import { createContext, useContext } from 'react';
+
+/** A page in the current pond, as the wikilink UI needs it (issue #46). */
+export interface WikilinkTarget {
+  slug: string;
+  title: string;
+}
+
+/** How a wikilink node resolves its target for display and navigation. */
+export interface WikilinkResolution {
+  /** Current title of the target page, or null when it does not exist (phantom). */
+  title: string | null;
+  exists: boolean;
+}
+
+export interface WikilinkContextValue {
+  /** Pages of the current pond, for the `[[` autocomplete. */
+  targets: WikilinkTarget[];
+  /** Resolve a slug to its live title and existence. */
+  resolve: (slug: string) => WikilinkResolution;
+  /** Pond slug, so a wikilink can build its navigation URL. */
+  pondSlug: string;
+  /** Whether the editor is in edit mode (click behaviour differs from read mode). */
+  editable: boolean;
+}
+
+/**
+ * Live pond context for wikilinks (issue #46). Provided by the page editor,
+ * consumed by the wikilink NodeView (title resolution, phantom styling) and the
+ * autocomplete popup. Defaults are inert so a wikilink still renders (as its
+ * slug) if it is ever mounted without a provider.
+ */
+export const WikilinkContext = createContext<WikilinkContextValue>({
+  targets: [],
+  resolve: () => ({ title: null, exists: false }),
+  pondSlug: '',
+  editable: false,
+});
+
+export function useWikilinks(): WikilinkContextValue {
+  return useContext(WikilinkContext);
+}
+
+/** Builds a slug→title lookup and a resolver from a pond's page list. */
+export function makeWikilinkResolver(
+  targets: WikilinkTarget[],
+): (slug: string) => WikilinkResolution {
+  const bySlug = new Map(targets.map((t) => [t.slug, t.title]));
+  return (slug) => {
+    const title = bySlug.get(slug);
+    return title !== undefined ? { title, exists: true } : { title: null, exists: false };
+  };
+}

apps/web/src/pages/PageEditorPage.tsx

@@ -1,8 +1,8 @@
-import type { PageStateView, PondView } from '@dorfteich/shared';
+import type { PageListItemView, PageStateView, PondView } from '@dorfteich/shared';
 import { useQuery } from '@tanstack/react-query';
 import { Collaboration } from '@tiptap/extension-collaboration';
 import { EditorContent, useEditor } from '@tiptap/react';
-import { useEffect, useLayoutEffect, useState } from 'react';
+import { useEffect, useLayoutEffect, useMemo, useState } from 'react';
 import { useTranslation } from 'react-i18next';
 import { Link, useNavigate, useParams } from 'react-router-dom';
 import * as Y from 'yjs';
@@ -18,6 +18,8 @@ import { ImageUpload } from '../editor/image-upload';
 import { PresenceStrip } from '../editor/PresenceStrip';
 import { Toolbar } from '../editor/Toolbar';
 import { useCollabProvider } from '../editor/use-collab-provider';
+import { WikilinkAutocomplete } from '../editor/WikilinkAutocomplete';
+import { WikilinkContext, makeWikilinkResolver } from '../editor/wikilink-context';
 import { useForceSidebarHidden } from '../layout/sidebar-chrome';
 import { ApiError, apiDelete, apiGet, apiGetText, apiPatch } from '../lib/api';
 import { recallPage, rememberPage } from '../offline/page-cache';
@@ -101,9 +103,20 @@ function PageEditor({
     editor?.setEditable(canEdit);
   }, [editor, canEdit]);
 
+  // Pond pages power wikilink title resolution + the `[[` autocomplete (#46).
+  const pondPages = useQuery({
+    queryKey: ['pages', page.pondId],
+    queryFn: () => apiGet<PageListItemView[]>(`/ponds/${page.pondId}/pages`),
+  });
+  const wikilinks = useMemo(() => {
+    const targets = (pondPages.data ?? []).map((p) => ({ slug: p.slug, title: p.title }));
+    return { targets, resolve: makeWikilinkResolver(targets), pondSlug, editable: canEdit };
+  }, [pondPages.data, pondSlug, canEdit]);
+
   if (!editor || !ydoc) return <></>;
 
   return (
+    <WikilinkContext.Provider value={wikilinks}>
       <div className="editor-shell">
         {canEdit && <Toolbar editor={editor} />}
         <div className="editor-connection" role="status" data-status={collab.status}>
@@ -129,7 +142,9 @@ function PageEditor({
           <AccessRevokedDialog editor={editor} slug={page.slug} onDiscard={discardLocalAndLeave} />
         )}
         <EditorContent editor={editor} className="editor-content" />
+        {canEdit && <WikilinkAutocomplete editor={editor} />}
       </div>
+    </WikilinkContext.Provider>
   );
 }
 
@@ -287,7 +302,7 @@ export function PageEditorPage(): React.JSX.Element {
         />
         <button
           type="button"
-          className="button"
+          className="button editor-page__mode-toggle"
           onClick={() => setMode(mode === 'edit' ? 'view' : 'edit')}
         >
           {mode === 'edit' ? t('mode.view') : t('mode.edit')}

apps/web/src/styles/base.css

@@ -1174,3 +1174,59 @@ button {
   background: var(--color-bg-subtle);
   color: var(--color-text);
 }
+
+/* Wikilinks (issue #46) ------------------------------------------------- */
+
+.wikilink-nodeview {
+  display: inline;
+}
+
+.wikilink {
+  color: var(--color-accent);
+  text-decoration: none;
+  border-bottom: 1px solid transparent;
+  cursor: pointer;
+}
+
+.wikilink:hover {
+  border-bottom-color: currentColor;
+}
+
+/* A link to a page that does not exist yet. */
+.wikilink--phantom {
+  color: var(--color-text-muted);
+  border-bottom: 1px dashed currentColor;
+}
+
+.wikilink-suggest {
+  list-style: none;
+  margin: 0;
+  padding: var(--space-1);
+  min-width: 14rem;
+  max-width: 22rem;
+  max-height: 16rem;
+  overflow-y: auto;
+  background: var(--color-bg);
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius);
+  box-shadow: 0 4px 16px rgb(0 0 0 / 12%);
+  z-index: 30;
+}
+
+.wikilink-suggest__item {
+  display: block;
+  width: 100%;
+  text-align: left;
+  padding: var(--space-1) var(--space-2);
+  border: 0;
+  border-radius: var(--radius);
+  background: none;
+  color: var(--color-text);
+  cursor: pointer;
+  font-size: 0.95rem;
+}
+
+.wikilink-suggest__item.is-active,
+.wikilink-suggest__item:hover {
+  background: var(--color-bg-subtle);
+}

packages/shared/i18n/de/editor.json

@@ -126,5 +126,10 @@
     "purgeConfirm": "Diese Seite und ihre Dateien endgültig löschen? Das kann nicht rückgängig gemacht werden.",
     "pageTrashedHint": "Diese Seite wurde in den Papierkorb verschoben.",
     "restoreLink": "Im Papierkorb ansehen"
+  },
+  "wikilink": {
+    "phantomTooltip": "Diese Seite existiert noch nicht",
+    "autocompleteLabel": "Auf eine Seite verlinken",
+    "createHint": "Seite „{{title}}“ anlegen"
   }
 }

packages/shared/i18n/en/editor.json

@@ -126,5 +126,10 @@
     "purgeConfirm": "Permanently delete this page and its files? This cannot be undone.",
     "pageTrashedHint": "This page has been moved to the trash.",
     "restoreLink": "View in trash"
+  },
+  "wikilink": {
+    "phantomTooltip": "This page does not exist yet",
+    "autocompleteLabel": "Link to a page",
+    "createHint": "Create page “{{title}}”"
   }
 }

packages/shared/src/editor-schema/html.ts

@@ -56,6 +56,15 @@ function renderInline(node: Node): string {
       const width = child.attrs.width as number | null;
       const widthAttr = width ? ` width="${width}"` : '';
       out += `<img data-file-id="${escapeHtml(child.attrs.fileId as string)}" alt="${alt}"${widthAttr}>`;
+    } else if (child.type.name === 'wikilink') {
+      // The slug and shown text; live title resolution and navigation happen
+      // where the pond's pages are known (issue #46) — this is the static
+      // representation used for the content cache and version history.
+      const slug = escapeHtml(child.attrs.targetSlug as string);
+      const display = child.attrs.displayText as string | null;
+      const text = escapeHtml(display ?? (child.attrs.targetSlug as string));
+      const displayAttr = display ? ` data-display="${escapeHtml(display)}"` : '';
+      out += `<a class="wikilink" data-wikilink="${slug}"${displayAttr}>${text}</a>`;
     }
   });
   return out;

packages/shared/src/editor-schema/markdown.test.ts

@@ -30,6 +30,10 @@ const FIXTURES: Record<string, string> = {
   image: '![A pond](file-123)',
 
   nestedBlockquoteAndList: '> - Item inside a quote\n> - Second item',
+
+  wikilinkBare: 'See [[architecture]] for details.',
+
+  wikilinkWithDisplay: 'See [[architecture|the design docs]] for details.',
 };
 
 describe('markdown round-trip (issue #24)', () => {
@@ -59,4 +63,24 @@ describe('markdown round-trip (issue #24)', () => {
     const doc = markdownToDoc('- [ ] Task\n- Plain item');
     expect(doc.firstChild?.type.name).toBe('bullet_list');
   });
+
+  it('parses a wikilink into a node with slug and optional display text (issue #46)', () => {
+    const withDisplay = markdownToDoc('[[my-page|My Page]]').firstChild?.firstChild;
+    expect(withDisplay?.type.name).toBe('wikilink');
+    expect(withDisplay?.attrs).toMatchObject({ targetSlug: 'my-page', displayText: 'My Page' });
+
+    const bare = markdownToDoc('[[my-page]]').firstChild?.firstChild;
+    expect(bare?.attrs).toMatchObject({ targetSlug: 'my-page', displayText: null });
+  });
+
+  it('leaves malformed brackets as plain text', () => {
+    // A single bracket pair is an ordinary (broken) markdown link, not a wikilink.
+    const doc = markdownToDoc('[[unclosed and [not a link]');
+    expect(doc.textContent).toContain('[[unclosed');
+    let hasWikilink = false;
+    doc.descendants((n) => {
+      if (n.type.name === 'wikilink') hasWikilink = true;
+    });
+    expect(hasWikilink).toBe(false);
+  });
 });

packages/shared/src/editor-schema/markdown.ts

@@ -1,4 +1,5 @@
 import MarkdownIt from 'markdown-it';
+import type StateInline from 'markdown-it/lib/rules_inline/state_inline.mjs';
 import Token from 'markdown-it/lib/token.mjs';
 import { Mark, Node } from 'prosemirror-model';
 import { MarkdownParser, MarkdownSerializer, MarkdownSerializerState } from 'prosemirror-markdown';
@@ -131,8 +132,41 @@ function transformTokens(tokens: Token[]): Token[] {
   return out;
 }
 
+/** markdown-it inline rule for `[[slug]]` / `[[slug|display]]` (issue #46). */
+function wikilinkRule(state: StateInline, silent: boolean): boolean {
+  const start = state.pos;
+  // Two opening brackets.
+  if (state.src.charCodeAt(start) !== 0x5b || state.src.charCodeAt(start + 1) !== 0x5b) {
+    return false;
+  }
+  const close = state.src.indexOf(']]', start + 2);
+  if (close < 0) return false;
+  const inner = state.src.slice(start + 2, close);
+  // No nesting or line breaks inside a wikilink.
+  if (inner.includes('[') || inner.includes(']') || inner.includes('\n')) return false;
+
+  const pipe = inner.indexOf('|');
+  const slug = (pipe >= 0 ? inner.slice(0, pipe) : inner).trim();
+  const display = pipe >= 0 ? inner.slice(pipe + 1).trim() : '';
+  if (!slug) return false;
+
+  if (!silent) {
+    const token = state.push('wikilink', '', 0);
+    token.attrs = display
+      ? [
+          ['target', slug],
+          ['display', display],
+        ]
+      : [['target', slug]];
+  }
+  state.pos = close + 2;
+  return true;
+}
+
 function createTokenizer(): MarkdownIt {
   const md = new MarkdownIt('default', { html: false });
+  // Run before `link` so `[[…]]` is not first eaten as two nested `[…]` links.
+  md.inline.ruler.before('link', 'wikilink', wikilinkRule);
   const rawParse = md.parse.bind(md);
   md.parse = (src, env) => transformTokens(rawParse(src, env));
   return md;
@@ -173,6 +207,13 @@ const markdownParser = new MarkdownParser(editorSchema, createTokenizer(), {
     }),
   },
   hardbreak: { node: 'hard_break' },
+  wikilink: {
+    node: 'wikilink',
+    getAttrs: (tok) => ({
+      targetSlug: tok.attrGet('target') ?? '',
+      displayText: tok.attrGet('display') || null,
+    }),
+  },
   em: { mark: 'italic' },
   strong: { mark: 'bold' },
   s: { mark: 'strikethrough' },
@@ -268,6 +309,11 @@ const markdownSerializer = new MarkdownSerializer(
       const fileId = (node.attrs.fileId as string).replace(/[()]/g, '\\$&');
       state.write(`![${alt}](${fileId})`);
     },
+    wikilink(state, node) {
+      const slug = node.attrs.targetSlug as string;
+      const display = node.attrs.displayText as string | null;
+      state.write(display ? `[[${slug}|${display}]]` : `[[${slug}]]`);
+    },
     hard_break(state, node, parent, index) {
       for (let i = index + 1; i < parent.childCount; i += 1) {
         if (parent.child(i).type !== node.type) {

packages/shared/src/editor-schema/plain-text.ts

@@ -2,8 +2,14 @@ import { Node } from 'prosemirror-model';
 
 /** Search/preview representation (data-model.md `page_content_cache`). */
 export function docToPlainText(doc: Node): string {
-  const text = doc.textBetween(0, doc.content.size, '\n\n', (leaf) =>
-    leaf.type.name === 'image' ? ((leaf.attrs.alt as string) ?? '') : '',
-  );
+  const text = doc.textBetween(0, doc.content.size, '\n\n', (leaf) => {
+    if (leaf.type.name === 'image') return (leaf.attrs.alt as string) ?? '';
+    // A wikilink contributes its shown text (explicit display or the slug) so
+    // search and previews include what the reader sees (issue #46).
+    if (leaf.type.name === 'wikilink') {
+      return (leaf.attrs.displayText as string | null) ?? (leaf.attrs.targetSlug as string);
+    }
+    return '';
+  });
   return text.replace(/\n{3,}/g, '\n\n').trim();
 }

packages/shared/src/editor-schema/schema.ts

@@ -142,6 +142,38 @@ export const editorSchema = new Schema({
       ],
     },
 
+    // Obsidian-style `[[page link]]` (ADR 0004, issue #46). An inline atom
+    // carrying the target page's `slug` and an optional explicit `displayText`;
+    // when `displayText` is null the editor/renderer shows the target's current
+    // title, so a rename updates every link. Live title resolution and phantom
+    // (missing target) styling happen where the pond's pages are known — the
+    // stored document only keeps slug + optional display text.
+    wikilink: {
+      group: 'inline',
+      inline: true,
+      atom: true,
+      attrs: {
+        targetSlug: { validate: 'string' },
+        displayText: { default: null },
+      },
+      parseDOM: [
+        {
+          tag: 'a[data-wikilink]',
+          getAttrs: (dom) => ({
+            targetSlug: dom.getAttribute('data-wikilink'),
+            displayText: dom.getAttribute('data-display') || null,
+          }),
+        },
+      ],
+      toDOM: (node) => {
+        const slug = node.attrs.targetSlug as string;
+        const display = node.attrs.displayText as string | null;
+        const attrs: Record<string, string> = { 'data-wikilink': slug, class: 'wikilink' };
+        if (display) attrs['data-display'] = display;
+        return ['a', attrs, display ?? slug];
+      },
+    },
+
     ...tableNodes({ tableGroup: 'block', cellContent: 'block+', cellAttributes: {} }),
   },