add roboust validation

[saswattulo]

🔗 Enhanced README Link Checker

Overview

Major enhancement of the README link checker script with improved functionality, better error handling, and concurrent processing capabilities.

🚀 New Features

• Concurrent Link Checking: Added ThreadPoolExecutor for parallel processing of multiple URLs
• Advanced URL Detection: Enhanced regex patterns to detect various markdown link formats
• Command-Line Interface: Full argparse integration with customizable options
• Verbose Mode: Optional detailed output showing successful links
• Smart Request Handling: Falls back from HEAD to GET requests when needed
• Redirect Detection: Shows final URLs after redirects
• Progress Feedback: Real-time status updates during link checking

🛠️ Improvements

• Better Error Handling: Distinguishes between timeout, connection, and other errors
• Configurable Timeouts: Customizable request timeout values
• Worker Control: Adjustable number of concurrent workers
• Exit Codes: Proper exit codes for CI/CD integration
• UTF-8 Support: Robust file encoding handling
• Summary Reports: Detailed statistics after completion

📋 Usage Examples

# Basic usage (checks README.md in current directory)
python check_readme_links.py

# Check specific file with verbose output
python check_readme_links.py docs/README.md -v

# Custom timeout and worker settings
python check_readme_links.py -t 15 -w 3

# Show all available options
python check_readme_links.py -h

🔧 Technical Changes

• Added concurrent processing with ThreadPoolExecutor
• Enhanced URL extraction with multiple regex patterns
• Implemented proper CLI argument parsing
• Added comprehensive error categorization
• Improved file handling and encoding support
• Added progress tracking and summary statistics

🎯 Benefits

• Faster execution through concurrent processing
• Better user experience with clear progress feedback
• More reliable error handling and reporting
• CI/CD ready with proper exit codes
• Flexible configuration for different use cases

📊 Performance

• Processes multiple links simultaneously (default: 5 workers)
• Configurable timeout prevents hanging on slow responses
• Efficient HEAD-first approach with GET fallback

🔍 Backward Compatibility

• Maintains original functionality while adding new features
• Default behavior works without any arguments
• Original file path parameter still supported

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Testing: Tested with various README files containing different URL formats
Dependencies: No new dependencies added (uses built-in libraries only)