feat(git-sync): native-Obsidian format — phase 1 = page-file (frontmatter gitmost_id)
Pivot the thin-meta design to "the vault IS a native Obsidian vault": clean markdown + a minimal YAML frontmatter `gitmost_id:` (the durable pageId, travels with the file so identity survives any move); folders mirror the page tree with the parent's body as a folder-note `<Folder>/<Folder>.md` (LostPaul Folder Notes convention); links as `[[wikilinks]]` (basename-resolved → reparent never breaks a link, only retitle does); collisions disambiguated Obsidian-style; `.obsidian/` and non-page files left untouched (no .gitignore). Verified the conventions against the Obsidian/Folder-Notes docs. Replaces the abandoned `.gitmost/index.json` sidecar (path-keyed → fragile to git-undetected renames; the in-file id is self-sufficient): removes vault-index.ts. Adds lib/page-file.ts — parsePageFile/serializePageFile (frontmatter id + clean body) with a LEGACY `docmost:meta` fallback for migration. 6 unit tests; engine suite green. Not yet wired into pull/push — no behavior change. Design doc rewritten to the native-Obsidian format. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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claude code agent 227
@@ -1,154 +0,0 @@
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/**
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* The vault SIDECAR index — `.gitmost/index.json`. It holds the ONLY service
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* metadata that is not derivable from the vault itself: a page's stable identity
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* (`pageId`) and its collision-disambiguation token (`slugId`), keyed by the
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* file's vault-relative (forward-slash) path. Everything else is derived:
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* - title -> the file/folder name (stem),
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* - parentPageId-> the enclosing folder's `index.md` (path-as-truth),
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* - spaceId -> the vault is the space,
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* - updatedAt -> git history.
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*
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* Keeping identity here (not in a `docmost:meta` block inside every file) lets
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* the `.md` files stay CLEAN markdown that any third-party editor (Obsidian, …)
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* reads and writes directly. This module is PURE (parse/serialize/lookup); all
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* file IO is the caller's (injected), matching the rest of the engine.
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*/
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/** Where the sidecar lives inside a space vault (vault-relative, forward-slash). */
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export const VAULT_INDEX_PATH = ".gitmost/index.json";
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/** Per-file identity record. `slugId` is optional (a freshly adopted file has
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* none until Docmost assigns one on create). */
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export interface VaultIndexEntry {
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pageId: string;
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slugId?: string;
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}
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export interface VaultIndex {
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version: number;
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/** The space this vault mirrors (one repo per space). Informational. */
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spaceId?: string;
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/** file path (forward-slash, vault-relative) -> identity. */
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pages: Map<string, VaultIndexEntry>;
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}
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const CURRENT_VERSION = 1;
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export function emptyVaultIndex(spaceId?: string): VaultIndex {
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return { version: CURRENT_VERSION, spaceId, pages: new Map() };
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}
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/**
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* Parse `.gitmost/index.json`. TOLERANT by construction — a missing file
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* (`null`), invalid JSON, or a malformed entry must never crash a sync cycle, so
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* those degrade to an empty index / skipped entries (the engine then treats the
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* affected files as un-tracked and re-derives identity, rather than losing data).
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*/
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export function parseVaultIndex(text: string | null | undefined): VaultIndex {
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if (text == null || text.trim() === "") return emptyVaultIndex();
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let raw: unknown;
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try {
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raw = JSON.parse(text);
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} catch {
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return emptyVaultIndex();
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}
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if (typeof raw !== "object" || raw === null) return emptyVaultIndex();
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const obj = raw as Record<string, unknown>;
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const index = emptyVaultIndex(
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typeof obj.spaceId === "string" ? obj.spaceId : undefined,
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);
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if (typeof obj.version === "number") index.version = obj.version;
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const pages = obj.pages;
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if (typeof pages === "object" && pages !== null) {
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for (const [path, value] of Object.entries(pages as Record<string, unknown>)) {
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if (typeof value !== "object" || value === null) continue;
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const entry = value as Record<string, unknown>;
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if (typeof entry.pageId !== "string" || entry.pageId === "") continue;
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index.pages.set(path, {
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pageId: entry.pageId,
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...(typeof entry.slugId === "string" ? { slugId: entry.slugId } : {}),
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});
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}
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}
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return index;
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}
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/**
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* Serialize to STABLE JSON: object keys sorted so the file produces minimal,
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* deterministic git diffs (a re-sync that changes nothing yields byte-identical
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* output — no churn, which the loop-guard relies on). Trailing newline.
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*/
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export function serializeVaultIndex(index: VaultIndex): string {
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const pages: Record<string, VaultIndexEntry> = {};
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for (const path of [...index.pages.keys()].sort()) {
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const e = index.pages.get(path)!;
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pages[path] = e.slugId
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? { pageId: e.pageId, slugId: e.slugId }
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: { pageId: e.pageId };
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}
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const out: Record<string, unknown> = { version: index.version };
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if (index.spaceId) out.spaceId = index.spaceId;
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out.pages = pages;
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return JSON.stringify(out, null, 2) + "\n";
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}
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// --- lookups (pure) --------------------------------------------------------
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/** The pageId tracked at `path`, or undefined. */
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export function pageIdAt(index: VaultIndex, path: string): string | undefined {
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return index.pages.get(path)?.pageId;
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}
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/** The slugId tracked at `path`, or undefined. */
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export function slugIdAt(index: VaultIndex, path: string): string | undefined {
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return index.pages.get(path)?.slugId;
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}
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/**
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* Reverse lookup: the CURRENT path of a pageId, or undefined. Used by push to
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* decide identity — a vanished file whose pageId still resolves to a (different)
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* tracked path is a MOVE, not a delete.
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*/
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export function pathForPageId(
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index: VaultIndex,
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pageId: string,
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): string | undefined {
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for (const [path, entry] of index.pages) {
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if (entry.pageId === pageId) return path;
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}
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return undefined;
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}
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/** The set of all pageIds currently tracked in the index. */
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export function trackedPageIds(index: VaultIndex): Set<string> {
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const ids = new Set<string>();
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for (const entry of index.pages.values()) ids.add(entry.pageId);
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return ids;
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}
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// --- mutations (in place; the index is a builder during a cycle) -----------
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export function setEntry(
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index: VaultIndex,
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path: string,
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entry: VaultIndexEntry,
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): void {
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index.pages.set(path, entry);
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}
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export function removeAt(index: VaultIndex, path: string): void {
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index.pages.delete(path);
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}
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/** Move a tracked entry from one path to another (a rename/reparent), keeping
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* its identity. No-op if `fromPath` is not tracked. */
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export function moveEntry(
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index: VaultIndex,
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fromPath: string,
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toPath: string,
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): void {
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const entry = index.pages.get(fromPath);
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if (!entry) return;
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index.pages.delete(fromPath);
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index.pages.set(toPath, entry);
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}
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@@ -120,17 +120,4 @@ export type {
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CycleFs,
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} from "./engine/cycle";
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export {
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VAULT_INDEX_PATH,
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emptyVaultIndex,
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parseVaultIndex,
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serializeVaultIndex,
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pageIdAt,
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slugIdAt,
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pathForPageId,
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trackedPageIds,
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setEntry,
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removeAt,
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moveEntry,
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} from "./engine/vault-index";
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export type { VaultIndex, VaultIndexEntry } from "./engine/vault-index";
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export { parsePageFile, serializePageFile } from "./lib/page-file";
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@@ -25,3 +25,4 @@ export {
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canonicalizeContent,
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docsCanonicallyEqual,
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} from "./canonicalize";
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export { parsePageFile, serializePageFile } from "./page-file";
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86
packages/git-sync/src/lib/page-file.ts
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86
packages/git-sync/src/lib/page-file.ts
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@@ -0,0 +1,86 @@
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import { parseDocmostMarkdown } from "./markdown-document";
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/**
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* The THIN page-file format (design: docs/backlog/git-sync-thin-meta.md, option
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* C). A page file is CLEAN markdown with a minimal YAML frontmatter carrying ONLY
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* the page's durable identity:
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*
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* ---
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* id: 019ef6fc-2638-7ce1-9ce3-2756ce038480
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* ---
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* <clean markdown body>
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*
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* Everything else is derived (title = filename, parentPageId = enclosing folder,
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* spaceId = the vault, updatedAt = git). The `id` (a Docmost pageId) is the only
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* non-derivable bit and travels WITH the file so identity survives any move,
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* even one git's rename detection misses. Third-party editors (Obsidian, …) see
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* clean markdown; the frontmatter is hidden in their preview.
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*
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* MIGRATION: a file may still carry the LEGACY `<!-- docmost:meta {…} -->` block
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* (the pre-thin format). `parsePageFile` reads the id from the frontmatter first,
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* then falls back to the legacy meta — so old vaults keep working and a re-sync
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* rewrites them into the thin format.
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*/
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/**
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* The frontmatter key carrying the Docmost pageId. NAMESPACED (not a bare `id`)
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* so it never collides with a user's own frontmatter fields.
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*/
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export const ID_KEY = "gitmost_id";
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/** Leading YAML frontmatter block: `---\n…\n---` at the very start of the file. */
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const FRONTMATTER_RE = /^?---\n([\s\S]*?)\n---\n?/;
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/** The top-level `<ID_KEY>: <value>` line inside the frontmatter (quotes optional). */
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function readIdFromYaml(yaml: string): string | null {
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const re = new RegExp(`^${ID_KEY}:\\s*(.+?)\\s*$`);
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for (const line of yaml.split("\n")) {
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const m = line.match(re);
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if (m) {
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const v = m[1].trim().replace(/^["']|["']$/g, "");
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return v === "" ? null : v;
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}
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}
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return null;
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}
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/**
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* Parse a page file into its identity (`id`) and clean markdown `body`. Tolerant:
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* a file with neither frontmatter nor legacy meta (a hand-written third-party
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* file) returns `id: null` and the whole text as the body — the caller then
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* ADOPTS it (creates a page, writes the id back).
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*/
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export function parsePageFile(full: string): {
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id: string | null;
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body: string;
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} {
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const text = (full ?? "").replace(/\r\n/g, "\n");
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// 1. Thin format: YAML frontmatter.
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const fm = text.match(FRONTMATTER_RE);
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if (fm) {
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return { id: readIdFromYaml(fm[1]), body: text.slice(fm[0].length).trim() };
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}
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// 2. Legacy format: `<!-- docmost:meta -->` block (migration fallback).
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if (/^\s*<!--\s*docmost:meta/.test(text)) {
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try {
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const { meta, body } = parseDocmostMarkdown(text);
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return { id: meta?.pageId ?? null, body };
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} catch {
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// a corrupt legacy block -> treat as an un-tracked plain file (adopt).
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}
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}
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// 3. Plain markdown — un-tracked (no identity yet).
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return { id: null, body: text.trim() };
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}
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/**
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* Serialize a page into the thin format: `id` frontmatter + a blank line + the
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* clean body + a trailing newline. Deterministic so an unchanged page re-syncs to
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* byte-identical output (no churn — the loop-guard relies on it).
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*/
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export function serializePageFile(id: string, body: string): string {
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return `---\n${ID_KEY}: ${id}\n---\n\n${body.trim()}\n`;
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}
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