Mini Project: CLI Tool with argparse

import argparse
import sys

def parse_args(args=None):
    """Parse command-line arguments."""
    parser = argparse.ArgumentParser(
        description="File Utils — A Python CLI tool",
        epilog="Example: python file_utils.py count -f readme.txt"
    )
    
    subparsers = parser.add_subparsers(dest="command", help="Available commands")
    
    # Count command
    count_parser = subparsers.add_parser("count", help="Count words/lines in text")
    count_parser.add_argument("text", help="Text to analyze")
    count_parser.add_argument("--lines", action="store_true", help="Count lines instead")
    
    # Search command
    search_parser = subparsers.add_parser("search", help="Search for a pattern")
    search_parser.add_argument("pattern", help="Pattern to search for")
    search_parser.add_argument("text", help="Text to search in")
    search_parser.add_argument("-i", "--ignore-case", action="store_true")
    
    # Format command
    format_parser = subparsers.add_parser("format", help="Format text")
    format_parser.add_argument("text", help="Text to format")
    format_parser.add_argument("--upper", action="store_true")
    format_parser.add_argument("--reverse", action="store_true")
    
    return parser.parse_args(args)

def main():
    # Demo with simulated arguments
    demos = [
        ["count", "Hello World Python is great"],
        ["count", "--lines", "Line1\nLine2\nLine3"],
        ["search", "python", "I love Python programming", "-i"],
        ["format", "hello world", "--upper"],
        ["format", "hello world", "--reverse"],
    ]
    
    for demo_args in demos:
        args = parse_args(demo_args)
        print(f"Command: {' '.join(demo_args)}")
        
        if args.command == "count":
            if args.lines:
                count = args.text.count("\n") + 1
                print(f"  Lines: {count}")
            else:
                count = len(args.text.split())
                print(f"  Words: {count}")
        
        elif args.command == "search":
            text = args.text.lower() if args.ignore_case else args.text
            pattern = args.pattern.lower() if args.ignore_case else args.pattern
            found = pattern in text
            print(f"  Found '{args.pattern}': {found}")
        
        elif args.command == "format":
            result = args.text
            if args.upper: result = result.upper()
            if args.reverse: result = result[::-1]
            print(f"  Result: {result}")
        
        print()

if __name__ == "__main__":
    main()