Add URL processing feature and enhance CLI documentation

[pablotoledo]

1. Summary of Changes

This pull request introduces significant enhancements to the Readium project, primarily focusing on adding URL processing capabilities. The key modifications include:

• Adding support for converting web pages to Markdown
• Extending the tool's functionality beyond repositories and directories
• Implementing web content extraction using Trafilatura
• Updating CLI, configuration, and core functionality to support URL processing

2. Technical Details

Files Modified

• README.md: Updated project description and usage examples
• pyproject.toml: Added Trafilatura dependency
• src/readium/cli.py: Added URL processing options
• src/readium/config.py: Added URL mode configuration
• src/readium/core.py: Implemented URL to Markdown conversion
• Added new test file: tests/test_url_handling.py

Key Functions/Methods Changed

• Added is_url() function in core.py
• Implemented convert_url_to_markdown() function
• Extended Readium.read_docs() to handle URL processing
• Updated ReadConfig to include URL-related configuration options

Code Quality Observations

• Robust error handling
• Type hinting and type safety
• Modular design with configuration options
• Comprehensive test coverage for new functionality

3. Implementation Analysis

Approach

• Leveraged Trafilatura library for web content extraction
• Implemented flexible configuration for URL processing
• Added two processing modes: 'clean' (default) and 'full'
• Maintained existing project architecture while extending functionality

Design Patterns

• Configuration object pattern (ReadConfig)
• Strategy pattern for URL processing modes
• Factory-like method for URL to Markdown conversion

Potential Improvements

• Add more comprehensive error handling for network-related issues
• Consider adding timeout and retry mechanisms
• Implement more granular content filtering options
• Add support for authentication for private web resources

4. Testing Considerations

Tests Added

• test_is_url(): URL detection tests
• test_convert_url_to_markdown(): Markdown conversion tests
• test_read_docs_url(): URL processing integration tests
• test_cli_url_processing(): CLI interface tests

Test Coverage

• Covers URL detection
• Handles various URL processing scenarios
• Mocks external dependencies (Trafilatura)
• Checks both successful and error scenarios

Areas Needing Additional Testing

• Performance testing for large web pages
• Testing with different types of web content
• Network error handling
• Authentication and security scenarios

5. Documentation

Documentation Quality

• README updated with new features and usage examples
• Inline code comments explaining new functionality
• Updated configuration options with clear descriptions

Areas Needing More Documentation

• Detailed explanation of URL processing modes
• Examples of handling different web content types
• Troubleshooting guide for common web scraping issues

6. Impact Assessment

Potential Impact on Existing Functionality

• Minimal impact on existing repository and directory processing
• New optional features do not break existing workflows
• Adds flexibility to the tool's use cases

Performance Considerations

• Web content extraction can be slower than local file processing
• Configurable extraction modes help manage performance
• Potential memory overhead for large web pages

Security Implications

• Relies on Trafilatura's security mechanisms
• Configurable content inclusion reduces potential risks
• No direct handling of authenticated resources yet

7. Conclusion

Overall Assessment

Recommendation: Approve

The pull request significantly enhances Readium's capabilities by adding robust URL to Markdown conversion. The implementation is:

• Well-designed
• Thoroughly tested
• Minimally invasive to existing functionality
• Provides valuable new features