Obsidian Plugin Plan

Status: retired. The Obsidian plugin is no longer supported: it left the monorepo on 2026-08-26 and the standalone latebit-io/obsidian-demarkus repo holds the last source. Kept for reference in the plan archives.

Goal

Build an Obsidian community plugin that lets users fetch, edit, and publish markdown documents to demarkus servers directly from their vault.

Architecture

Bridge: Shell out to demarkus CLI via Node.js child_process.execFile. Obsidian runs in Electron with full Node.js access, so no HTTP proxy or new infra needed. Users must have demarkus installed (detected on plugin load).

Plugin type: Standard Obsidian community plugin (TypeScript, esbuild, manifest.json).

Location: plugins/obsidian/ in the demarkus monorepo. Published separately to the Obsidian community plugin registry.

MVP Scope

Commands

1. Demarkus: Fetch Document — Prompt for mark:// URL, fetch via CLI, create/update note in vault
2. Demarkus: Publish Note — Publish current note to a configured demarkus server
3. Demarkus: List Documents — Show documents on a server, pick one to fetch

Settings

• Server URL — default mark:// host (e.g., mark://soul.demarkus.io)
• Token — capability token for publish operations (stored in Obsidian settings, never in vault files)
• CLI Path — path to demarkus binary (auto-detected, override in settings)
• Insecure — allow self-signed certs (for local dev servers)

Frontmatter Handling

Demarkus responses include YAML frontmatter (status, version, modified, etag, content-hash). On fetch:

• Store mark-url, mark-version, and mark-etag in note frontmatter
• Strip protocol metadata (status, content-hash) — not useful in vault

On publish:

• Read mark-url from frontmatter to know where to publish
• Use mark-version for optimistic concurrency (expected-version)
• Update frontmatter with new version after successful publish

CLI Integration

// Fetch
execFile('demarkus', ['fetch', url], callback)

// Publish  
execFile('demarkus', ['publish', url, '--expected-version', version, '--token', token], {
  input: noteContent  // pipe body via stdin
}, callback)

// List
execFile('demarkus', ['list', url], callback)

Parse CLI output (YAML frontmatter + markdown body) to extract metadata and content.

File Structure

plugins/obsidian/
├── src/
│   ├── main.ts          — Plugin class, command registration
│   ├── settings.ts      — Settings tab
│   ├── cli.ts           — demarkus CLI wrapper (execFile + output parsing)
│   └── frontmatter.ts   — Frontmatter read/write helpers
├── manifest.json
├── package.json
├── tsconfig.json
├── esbuild.config.mjs
└── README.md

Implementation Steps

1. Scaffold from obsidian-sample-plugin template
2. Implement CLI wrapper (cli.ts) — execFile, parse YAML frontmatter + body from stdout
3. Implement settings tab — server URL, token, CLI path, insecure flag
4. Implement "Fetch Document" command — prompt for URL, fetch, create/update vault note
5. Implement "Publish Note" command — read frontmatter, publish via CLI, update frontmatter
6. Implement "List Documents" command — list, show in modal, fetch selected
7. Test with local demarkus server
8. Test with remote server (soul.demarkus.io)

Future (Post-MVP)

• Sidebar panel with server browser
• Auto-sync on save (opt-in)
• Version history viewer (VERSIONS verb)
• Diff between local and remote
• Multiple server profiles
• Link resolution (mark:// links clickable in Obsidian)