tzst/docs/development.md

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# Development Guide

This guide provides comprehensive information for developers contributing to or working with the tzst library.

## Setting up Development Environment

This project uses modern Python packaging standards:

```bash
git clone https://github.com/xixu-me/tzst.git
cd tzst
pip install -e .[dev]
```

The development installation includes all necessary tools:

- **pytest** - Testing framework
- **ruff** - Linting and formatting
- **coverage** - Code coverage analysis
- **sphinx** - Documentation generation

## Running Tests

### Basic Test Commands

```bash
# Run all tests
python -m pytest

# Run tests with coverage
pytest --cov=tzst --cov-report=html

# Or use the simpler command (coverage settings are in pyproject.toml)
pytest

# Run with verbose output
python -m pytest -v

# Run specific test file
python -m pytest tests/test_core.py

# Run integration tests only
python -m pytest -m integration
```

### Test Structure

- **Unit tests**: Test individual functions and methods
- **Integration tests**: Test component interactions
- **CLI tests**: Test command-line interface
- **Platform-specific tests**: Test OS-specific functionality

### Writing Tests

1. **Use descriptive test names:**

   ```python
   def test_create_archive_with_compression_level_9():
   ```

2. **Use fixtures for common test data:**

   ```python
   def test_extract_archive(sample_archive_path, temp_dir):
   ```

3. **Test edge cases:**
   - Empty files
   - Large files
   - Invalid inputs
   - Corrupted archives

4. **Add markers for test categorization:**

   ```python
   @pytest.mark.integration
   def test_full_archive_workflow():
   ```

## Code Quality

### Running Code Style Tools

```bash
# Check code quality
ruff check src tests

# Fix auto-fixable issues
ruff check --fix src tests

# Format code
ruff format src tests

# Check formatting without making changes
ruff format --check src tests
```

### Configuration

Settings are defined in `pyproject.toml`:

- Line length: 88 characters
- Target Python version: 3.12+
- Import sorting with isort
- Quote style: double quotes

### Code Style Guidelines

1. **Follow PEP 8** with project-specific modifications
2. **Use type hints** for all public APIs
3. **Write docstrings** for classes and public methods
4. **Keep functions focused** and reasonably sized
5. **Use meaningful variable names**
6. **Add comments** for complex logic

## Documentation

### Building Documentation

```bash
# Navigate to docs directory
cd docs

# Install documentation dependencies
pip install -r requirements.txt

# Build HTML documentation
make html

# On Windows, use:
make.bat html

# View built documentation
# Open docs/_build/html/index.html in your browser
```

### Documentation Structure

```
docs/
├── index.md           # Main documentation landing page
├── quickstart.md      # Getting started guide
├── performance.md     # Performance guide and comparisons
├── examples.md        # Usage examples
├── development.md     # This development guide
├── api/               # API reference documentation
│   ├── index.md
│   ├── core.md
│   ├── cli.md
│   └── exceptions.md
├── conf.py           # Sphinx configuration
└── requirements.txt  # Documentation dependencies
```

### Writing Documentation

- Use **MyST Markdown** format
- Include **code examples** for new features
- Add **cross-references** using proper syntax
- Test all **code snippets** to ensure they work

## Project Structure

```
tzst/
├── src/tzst/           # Main package source code
│   ├── __init__.py     # Package initialization and exports
│   ├── __main__.py     # CLI entry point
│   ├── cli.py          # Command-line interface
│   ├── core.py         # Core archive functionality
│   └── exceptions.py   # Custom exceptions
├── tests/              # Test suite
│   ├── conftest.py     # Pytest configuration and fixtures
│   ├── test_core.py    # Core functionality tests
│   ├── test_cli.py     # CLI tests
│   └── test_*.py       # Additional test modules
├── docs/               # Documentation source
├── .github/            # GitHub workflows and templates
├── pyproject.toml      # Project configuration
├── README.md           # Project Readme
├── LICENSE             # BSD 3-Clause License
└── CONTRIBUTING.md     # Contribution guidelines
```

## Contributing Workflow

### 1. Making Changes

#### Types of Contributions

- **Bug fixes**: Fix issues in existing functionality
- **Features**: Add new capabilities to the library
- **Documentation**: Improve or add documentation
- **Tests**: Add or improve test coverage
- **Performance**: Optimize existing code
- **Security**: Address security vulnerabilities

#### Branch Naming

Use descriptive branch names:

- `feature/add-streaming-mode`
- `fix/handle-corrupted-archives`
- `docs/improve-api-documentation`
- `test/add-compression-tests`

### 2. Commit Messages

Follow conventional commit format:

```
type(scope): description

[optional body]

[optional footer]
```

**Types:**

- `feat`: New feature
- `fix`: Bug fix
- `docs`: Documentation changes
- `test`: Adding or modifying tests
- `refactor`: Code refactoring
- `perf`: Performance improvements
- `chore`: Build process or auxiliary tool changes

**Examples:**

```
feat(core): add streaming compression support

fix(cli): handle invalid archive paths gracefully

docs(readme): update installation instructions
```

### 3. Pull Request Process

1. **Create a feature branch:**

   ```bash
   git checkout -b feature/your-feature-name
   ```

2. **Make your changes** following the guidelines above

3. **Add tests** for new functionality

4. **Update documentation** if needed

5. **Run the test suite:**

   ```bash
   python -m pytest
   ruff check .
   ruff format --check .
   ```

6. **Commit your changes:**

   ```bash
   git add .
   git commit -m "feat: add your feature description"
   ```

7. **Push to your fork:**

   ```bash
   git push origin feature/your-feature-name
   ```

8. **Create a pull request** using the provided template

### 4. Pull Request Guidelines

- **Fill out the PR template** completely
- **Link related issues** using keywords (fixes #123)
- **Keep PRs focused** - one feature/fix per PR
- **Ensure all CI checks pass**
- **Respond to review feedback** promptly

## Development Tips

### Performance Considerations

- Use streaming for large files
- Consider memory usage patterns
- Profile code for bottlenecks
- Test with various file sizes

### Security Considerations

- Validate all user inputs
- Use secure defaults (e.g., 'data' filter)
- Handle malicious archives safely
- Be cautious with file paths

### Compatibility

- Support Python 3.12+
- Test on multiple platforms (Windows, macOS, Linux)
- Consider different filesystem behaviors
- Maintain backwards compatibility when possible

## Release Process

Releases are handled by maintainers:

1. Update version in `src/tzst/__init__.py`
2. Create a release tag
3. Automated CI/CD publishes to PyPI

## Getting Help

### Resources

- **Issues**: [GitHub Issues](https://github.com/xixu-me/tzst/issues)
- **Discussions**: Use GitHub Discussions for questions
- **Documentation**: Check the README and code comments

### Reporting Issues

When reporting bugs:

1. **Use the bug report template**
2. **Provide a minimal reproduction case**
3. **Include system information** (OS, Python version)
4. **Attach relevant files** if possible (archives, logs)

### Suggesting Features

When suggesting features:

1. **Use the feature request template**
2. **Explain the use case** and motivation
3. **Consider backwards compatibility**
4. **Provide implementation ideas** if you have them

## Code of Conduct

This project follows the principles of respectful collaboration. Please be kind, constructive, and professional in all interactions.

## Recognition

Contributors are recognized in several ways:

- Listed in release notes for significant contributions
- Mentioned in README acknowledgments
- GitHub contributor statistics

Thank you for contributing to tzst! Your efforts help make this library better for everyone.