obsidian-remarkable/IMPLEMENTATION.md

# Obsidian reMarkable Sync Plugin - Implementation Summary

## Status: ✅ Phase 1 Complete (Reviewed & Fixed)

The plugin has been **reviewed, fixed, and rebuilt**. All critical and major issues from the code review have been resolved.

---

## 🔧 Fixes Applied (Post-Review)

### Critical Bugs (all fixed)
| # | Issue | File | Fix |
|---|---|---|---|
| 1 | `SyncTracker` corrupted plugin settings | `src/sync/tracker.ts` | Now merges with existing data before saving |
| 2 | `runCommand()` hung on spawn errors | `src/utils/process.ts` | Added `error` event handler + dedup resolution |
| 3 | Invalid `"dir"` in manifest | `manifest.json` | Removed property |
| 4 | Wrong vault path handling | `src/sync/downloader.ts` | Uses `vault.adapter` paths directly |

### Major Issues (all fixed)
| # | Issue | File | Fix |
|---|---|---|---|
| 5 | `ls` flag order (Go parser) | `src/rmapi/bridge.ts` | `--json` before positional path |
| 6 | No incremental sync | `src/sync/downloader.ts` | Checks `modifiedClient` vs `lastSynced` |
| 7 | Unsanitized filenames | `src/sync/downloader.ts` | `sanitizeFileName()` replaces illegal chars |
| 8 | Broken `authenticate()` | `src/rmapi/bridge.ts` | Replaced with `isAuthenticated()` + user message |
| 9 | Only root-level sync | `src/sync/downloader.ts` | `listAllDocuments()` recursively traverses folders |
| 10 | Noisy load/unload notices | `src/main.ts` | Removed; status bar shows state instead |
| 11 | Dev watch script broken | `esbuild.config.mjs` | Uses `esbuild.context().watch()` |
| 12 | Dead `killProcess()` code | `src/utils/process.ts` | Removed |
| 13 | `mkdir` silent failures | `src/sync/downloader.ts` | Wrapped in try/catch with warning log |

### Minor Issues (all fixed)
| # | Issue | File | Fix |
|---|---|---|---|
| 14 | `pageRenderer` `as any` cast | `src/settings.ts` | Proper union type cast |
| 15 | `syncInterval` text input | `src/settings.ts` | `type="number"` with `min="0"` + validation |
| 16 | Static status bar | `src/main.ts` | Dynamic: "Idle" / "Syncing..." / "Last sync: HH:MM:SS" |

---

## 📁 Project Structure

```
obidian-remarkable/
├── dist/
│   └── main.js              # Built plugin (minified, ready to install)
├── src/
│   ├── main.ts              # Plugin entry: ribbon, commands, status bar, auto-sync
│   ├── settings.ts          # Settings tab with validation
│   ├── types.ts             # Shared TypeScript types
│   ├── rmapi/
│   │   └── bridge.ts        # rmapi CLI wrapper (env, auth check, JSON parsing)
│   ├── sync/
│   │   ├── downloader.ts    # Recursive doc listing + incremental download
│   │   └── tracker.ts       # Sync state persistence (merges with settings)
│   └── utils/
│       └── process.ts       # Child process runner with error handling
├── main.ts                  # Entry point (re-exports plugin)
├── manifest.json            # Obsidian plugin manifest
├── package.json             # Build scripts
├── esbuild.config.mjs       # esbuild config (build + watch modes)
└── IMPLEMENTATION.md        # This file
```

---

## 🚀 Usage

1. **Install plugin**: Copy folder to Obsidian plugins directory
2. **Install rmapi**: Download from https://github.com/ddvk/rmapi/releases
3. **Configure**: Open Settings → reMarkable Sync
4. **Authenticate**: Run `rmapi` in a terminal once to pair with your tablet
5. **Sync**: Click ribbon pencil icon or run command "Sync from reMarkable"

---

## 🔄 Sync Flow

```
User clicks ribbon icon / auto-sync interval
  → isAuthenticated() check (fails with notice if not paired)
  → listAllDocuments("/") recursively
    → ls --json / (root)
    → For each CollectionType: recurse into subfolder
  → For each DocumentType:
    → Skip if lastSynced >= modifiedClient (incremental)
    → sanitizeFileName() for safe filesystem names
    → mkdir downloadPath (vault-relative)
    → rmapi get → download .rm file
    → (if enabled) rmapi geta → download annotated PDF
    → trackDocument() in sync state
  → Status bar updated: "Last sync: HH:MM:SS"
```

---

## ⚙️ Configuration

| Setting | Default | Description |
|---|---|---|
| `remarkableHost` | `https://10.11.99.1` | reMarkable tablet URL |
| `rmapiBinaryPath` | `rmapi` | Path to rmapi binary |
| `downloadPath` | `remarkable/` | Vault folder for downloads |
| `convertToPdf` | `true` | Auto-download annotated PDFs |
| `enableHandwritingMd` | `true` | Enable OCR pipeline (Phase 2) |
| `glmocrServerUrl` | `http://100.103.83.12:5002` | GLM-OCR SDK Server |
| `glmocrApiKey` | `any-string` | Dummy key for self-hosted |
| `ollamaHost` | `http://100.103.83.12:11435` | Ollama server |
| `styleModel` | `qwen3:32b` | Model for markdown cleanup |
| `pageRenderer` | `drawj2d` | `.rm` → PNG tool |
| `javaPath` | `java` | Java runtime for drawj2d |
| `syncInterval` | `0` | Minutes between auto-sync (0 = off) |

---

## 📦 External Dependencies

### Required (user-provided)
- **rmapi binary**: https://github.com/ddvk/rmapi/releases
- **reMarkable tablet**: On local network at configured host

### Optional (for Phase 2 OCR)
- **GLM-OCR Server**: Run `python -m glmocr.server` on configured host
- **Ollama**: With `qwen3:32b` (or chosen model) pulled
- **Java**: For `drawj2d` page rendering

---

## 🔮 Phase 2: Handwriting OCR Pipeline (Planned)

1. **Extract HWR text** from `.rm` file's built-in handwriting recognition layer
2. **Render pages to PNG** via `drawj2d` or `rM2svg`
3. **POST to GLM-OCR Server** (`glm-5.1:cloud` equivalent) for structured markdown
4. **Style refinement** via Ollama (`qwen3:32b`) — light cleanup (Option A):
   - Fix heading hierarchy
   - Consolidate fragments
   - Detect lists, emphasis
   - Preserve all content

---

## 📝 Notes

- **Auth token storage**: `RMAPI_CONFIG` points to `.obsidian/rmapi` inside vault (portable)
- **Sync state**: Stored via Obsidian's `saveData()` API, merged with settings
- **Auto-sync**: Registered via `registerInterval()` — Obsidian cleans up on unload
- **Filename safety**: `sanitizeFileName()` replaces `[\\/:*?"<>|]` with `_`
- **Incremental logic**: Compares ISO timestamps (`lastSynced >= modifiedClient`)

---

## 🎯 Build & Install

```bash
# Build
npm install
npm run build

# Dev (watch mode)
npm run dev

# Install in Obsidian
Copy the `obidian-remarkable` folder to:
- Linux: ~/.config/obsidian/plugins/
- macOS: ~/Library/Application Support/obsidian/plugins/
- Windows: %APPDATA%\obsidian\plugins\
```

---

**Status**: ✅ Ready for testing. All reviewed issues fixed.