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---
name: ck:markdown-novel-viewer
description: View markdown files with calm, book-like reading experience via HTTP server. Use for long-form content, documentation preview, novel reading, report viewing, distraction-free reading.
argument-hint: "[file-or-directory]"
metadata:
author: claudekit
version: "1.0.0"
---
# markdown-novel-viewer
Background HTTP server rendering markdown files with calm, book-like reading experience.
**Note:** HTML generation mode (`/ck:preview --html ...`) produces self-contained HTML files that open directly in the browser — they do not use this server.
## ⚠️ Installation Required
**This skill requires npm dependencies.** Run one of the following:
```bash
# Option 1: Install via ClaudeKit CLI (recommended)
ck init # Runs install.sh which handles all skills
# Option 2: Manual installation
cd .opencode/skills/markdown-novel-viewer
npm install
```
**Dependencies:** `marked`, `highlight.js`, `gray-matter`
Without installation, you'll get **Error 500: Error rendering markdown**.
## Purpose
Universal viewer - pass ANY path and view it:
- **Markdown files** → novel-reader UI with serif fonts, warm theme
- **Directories** → file listing browser with clickable links
## Quick Start
```bash
# View a markdown file
node .opencode/skills/markdown-novel-viewer/scripts/server.cjs \
--file ./plans/my-plan/plan.md \
--open
# Browse a directory
node .opencode/skills/markdown-novel-viewer/scripts/server.cjs \
--dir ./plans \
--host 0.0.0.0 \
--open
# Background mode
node .opencode/skills/markdown-novel-viewer/scripts/server.cjs \
--file ./README.md \
--background
# Stop all running servers
node .opencode/skills/markdown-novel-viewer/scripts/server.cjs --stop
```
## Skill Invocation
Use `/ck:preview` for quick access:
```bash
/ck:preview plans/my-plan/plan.md # View markdown file
/ck:preview plans/ # Browse directory
/ck:preview --stop # Stop server
```
## Features
### Novel Theme
- Warm cream background (light mode)
- Dark mode with warm gold accents
- Libre Baskerville serif headings
- Inter body text, JetBrains Mono code
- Maximum 720px content width
### Mermaid.js Diagrams
- Auto-renders `mermaid` code blocks as diagrams
- Theme-aware (light/dark mode support)
- Full-width toggle: Click diagram to expand/collapse
- Error display with source preview for debugging
### Directory Browser
- Clean file listing with emoji icons
- Markdown files link to viewer
- Folders link to sub-directories
- Parent directory navigation (..)
- Light/dark mode support
### Focused Reader Mode
- **Auto-hide header**: Header hides on scroll down, shows on scroll up
- **Progress bar**: Always-visible horizontal progress bar tracks reading position
- **Distraction-free**: Minimal UI that gets out of the way while reading
- **Smooth transitions**: Gentle animations for header show/hide
### Plan Navigation
- Auto-detects plan directory structure
- Accordion sidebar with status badges (✓ complete, ⏳ in progress)
- Previous/Next navigation buttons
- Auto-hide header with progress bar on scroll
- Mobile FAB (floating action button) for navigation
- Bottom sheet sidebar for mobile devices
### Keyboard Shortcuts
**First-time toast**: Shows "Press ? for keyboard shortcuts" on first visit (auto-dismisses after 5s)
**Available shortcuts:**
- `?` - Show keyboard shortcuts cheatsheet (full-screen overlay)
- `T` - Toggle theme (light/dark)
- `S` - Toggle sidebar (desktop)
- `←` / `→` - Navigate previous/next phase
- `Esc` - Close sidebar (mobile) or cheatsheet modal
**Cheatsheet modal**: Press `?` to see all shortcuts in a full-screen overlay with backdrop blur. Close with `Esc`, `×` button, or backdrop click.
### Mobile Optimization
- **FAB (Floating Action Button)**: Fixed bottom-right button for navigation on mobile
- **Bottom sheet**: Slide-up sidebar with touch gestures
- **Touch-friendly**: Larger tap targets, swipe gestures
- **Responsive breakpoint**: Switches at 768px viewport width
## CLI Options
| Option | Description | Default |
|--------|-------------|---------|
| `--file <path>` | Markdown file to view | - |
| `--dir <path>` | Directory to browse | - |
| `--port <number>` | Server port | 3456 |
| `--host <addr>` | Host to bind (`0.0.0.0` for remote) | localhost |
| `--open` | Auto-open browser | false |
| `--background` | Run in background | false |
| `--stop` | Stop all servers | - |
## Architecture
```
scripts/
├── server.cjs # Main entry point
└── lib/
├── port-finder.cjs # Dynamic port allocation
├── process-mgr.cjs # PID file management
├── http-server.cjs # Core HTTP routing (/view, /browse)
├── markdown-renderer.cjs # MD→HTML conversion
└── plan-navigator.cjs # Plan detection & nav
assets/
├── template.html # Markdown viewer template
├── reader.js # Client-side interactivity
├── novel-theme.css # Main theme file (imports modules)
├── directory-browser.css # Directory browser styles
└── styles/ # Modular CSS architecture
├── novel-theme-base.css # Base colors, fonts, reset
├── novel-theme-typography.css # Headings, paragraphs, lists
├── novel-theme-code.css # Code blocks, syntax highlighting
├── novel-theme-tables.css # Table styling
├── novel-theme-links.css # Link states, hover effects
├── novel-theme-layout.css # Grid, spacing, containers
├── novel-theme-header.css # Auto-hide header, progress bar
├── novel-theme-sidebar.css # Accordion sidebar, status badges
└── novel-theme-overlays.css # Toast, cheatsheet modal
```
## HTTP Routes
| Route | Description |
|-------|-------------|
| `/view?file=<path>` | Markdown file viewer |
| `/browse?dir=<path>` | Directory browser |
| `/assets/*` | Static assets |
| `/file/*` | Local file serving (images) |
## Dependencies
- Node.js built-in: `http`, `fs`, `path`, `net`
- npm: `marked`, `highlight.js`, `gray-matter` (installed via `npm install`)
## Customization
### Theme Colors (CSS Variables)
Light mode variables in `assets/novel-theme.css`:
```css
--bg-primary: #faf8f3; /* Warm cream */
--accent: #8b4513; /* Saddle brown */
```
Dark mode:
```css
--bg-primary: #1a1a1a; /* Near black */
--accent: #d4a574; /* Warm gold */
```
### Content Width
```css
--content-width: 720px;
```
## Remote Access
To access from another device on your network:
```bash
# Start with 0.0.0.0 to bind to all interfaces
node .opencode/skills/markdown-novel-viewer/scripts/server.cjs --file ./README.md --host 0.0.0.0 --port 3456
```
When using `--host 0.0.0.0`, the server auto-detects your local network IP and includes it in the output:
```json
{
"success": true,
"url": "http://localhost:3456/view?file=...",
"networkUrl": "http://192.168.2.75:3456/view?file=...",
"port": 3456
}
```
Use `networkUrl` to access from other devices on the same network.
## Troubleshooting
**Port in use**: Server auto-increments to next available port (3456-3500)
**Images not loading**: Ensure image paths are relative to markdown file
**Server won't stop**: Check `/tmp/md-novel-viewer-*.pid` for stale PID files
**Remote access denied**: Use `--host 0.0.0.0` to bind to all interfaces
## Mermaid.js Diagrams
### Usage
Use fenced code blocks with `mermaid` language:
````markdown
```mermaid
pie title Traffic Sources
"Organic" : 45
"Direct" : 30
"Referral" : 25
```
````
### Supported Diagram Types
| Type | Syntax | Use Case |
|------|--------|----------|
| Flowchart | `flowchart LR/TB/TD` | Process flows, decision trees |
| Sequence | `sequenceDiagram` | API interactions, message flows |
| Pie | `pie title "..."` | Distribution data |
| Gantt | `gantt` | Project timelines |
| XY Chart | `xychart-beta` | Bar/line charts |
| Mindmap | `mindmap` | Idea hierarchies |
| Quadrant | `quadrantChart` | 2x2 matrices |
### Validating Mermaid Snippets
**Quick validation**: Use the [Mermaid Live Editor](https://mermaid.live) to test syntax.
**Common errors and fixes**:
| Error | Cause | Fix |
|-------|-------|-----|
| `Parse error` | Invalid syntax | Check diagram type declaration |
| `Unknown diagram type` | Typo in declaration | Use exact type: `flowchart`, not `flow` |
| `Expecting token` | Missing quotes/brackets | Ensure balanced delimiters |
| `UnknownDiagramError` | Empty or malformed block | Add valid diagram content |
### Fixing Common Issues
**1. Flowchart arrows**
```mermaid
%% Wrong: A -> B
%% Correct:
flowchart LR
A --> B
```
**2. Pie chart values**
```mermaid
%% Wrong: "Label": 50%
%% Correct:
pie title Sales
"Product A" : 50
"Product B" : 30
```
**3. XY Chart data format**
```mermaid
xychart-beta
title "Monthly Sales"
x-axis [Jan, Feb, Mar]
y-axis "Revenue" 0 --> 100
bar [30, 45, 60]
```
**4. Sequence diagram participants**
```mermaid
sequenceDiagram
participant A as Client
participant B as Server
A->>B: Request
B-->>A: Response
```
### Debug Mode
When a diagram fails to render, the viewer shows:
- Error message
- Expandable source code preview
- Line number where parsing failed (when available)
Fix the syntax and refresh the page to re-render.