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claude-howto/scripts/README.md
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# EPUB Builder Script
Build an EPUB ebook from the Claude How-To markdown files.
## Features
- Organizes chapters by folder structure (01-slash-commands, 02-memory, etc.)
- Renders Mermaid diagrams as PNG images via Kroki.io API
- Async concurrent fetching - renders all diagrams in parallel
- Generates a cover image from the project logo
- Converts internal markdown links to EPUB chapter references
- Strict error mode - fails if any diagram cannot be rendered
## Requirements
- Python 3.10+
- [uv](https://github.com/astral-sh/uv)
- Internet connection for Mermaid diagram rendering
## Quick Start
```bash
# Simplest way - uv handles everything
uv run scripts/build_epub.py
```
## Development Setup
```bash
# Create virtual environment
uv venv
# Activate and install dependencies
source .venv/bin/activate
uv pip install -r requirements-dev.txt
# Run tests
pytest scripts/tests/ -v
# Run the script
python scripts/build_epub.py
```
## Command-Line Options
```
usage: build_epub.py [-h] [--root ROOT] [--output OUTPUT] [--verbose]
[--timeout TIMEOUT] [--max-concurrent MAX_CONCURRENT]
options:
-h, --help show this help message and exit
--root, -r ROOT Root directory (default: repo root)
--output, -o OUTPUT Output path (default: claude-howto-guide.epub)
--verbose, -v Enable verbose logging
--timeout TIMEOUT API timeout in seconds (default: 30)
--max-concurrent N Max concurrent requests (default: 10)
```
## Examples
```bash
# Build with verbose output
uv run scripts/build_epub.py --verbose
# Custom output location
uv run scripts/build_epub.py --output ~/Desktop/claude-guide.epub
# Limit concurrent requests (if rate-limited)
uv run scripts/build_epub.py --max-concurrent 5
```
## Output
Creates `claude-howto-guide.epub` in the repository root directory.
The EPUB includes:
- Cover image with project logo
- Table of contents with nested sections
- All markdown content converted to EPUB-compatible HTML
- Mermaid diagrams rendered as PNG images
## Running Tests
```bash
# With virtual environment
source .venv/bin/activate
pytest scripts/tests/ -v
# Or with uv directly
uv run --with pytest --with pytest-asyncio \
--with ebooklib --with markdown --with beautifulsoup4 \
--with httpx --with pillow --with tenacity \
pytest scripts/tests/ -v
```
## Dependencies
Managed via PEP 723 inline script metadata:
| Package | Purpose |
|---------|---------|
| `ebooklib` | EPUB generation |
| `markdown` | Markdown to HTML conversion |
| `beautifulsoup4` | HTML parsing |
| `httpx` | Async HTTP client |
| `pillow` | Cover image generation |
| `tenacity` | Retry logic |
## Troubleshooting
**Build fails with network error**: Check internet connectivity and Kroki.io status. Try `--timeout 60`.
**Rate limiting**: Reduce concurrent requests with `--max-concurrent 3`.
**Missing logo**: The script generates a text-only cover if `claude-howto-logo.png` is not found.