1. import argparse
  2. import inspect
  4. def instrument_command_line(func):
  5. """
  6. Instruments a function that uses argparse to add dry-run functionality.
  7. """
  8. sig = inspect.signature(func)
  9. parser = argparse.ArgumentParser()
  11. # Add a dry-run flag
  12. parser.add_argument(
  13. "--dry-run",
  14. action="store_true",
  15. help="Perform a dry run; print actions without executing them.",
  16. )
  18. # Parse arguments
  19. def wrapper(*args, **kwargs):
  20. """Wrapper function to add dry-run functionality."""
  21. parsed_args = parser.parse_args(*args, **kwargs)
  23. # Check for dry-run flag
  24. if parsed_args.dry_run:
  25. print("Dry run mode enabled.")
  26. # Modify the original function's behavior for dry run
  27. # (e.g., print actions instead of executing them)
  29. #This is where you would modify the original function.
  30. #For example:
  31. #original_function(*args, **kwargs) # Call the original function
  32. print("Would execute action...")
  34. return None # Or return a placeholder value
  35. else:
  36. return func(*args, **kwargs)
  38. return wrapper
  41. if __name__ == '__main__':
  42. @instrument_command_line
  43. def my_command(input_file, output_dir, verbose=False):
  44. """
  45. Example command-line function.
  46. """
  47. print(f"Input file: {input_file}")
  48. print(f"Output directory: {output_dir}")
  49. if verbose:
  50. print("Verbose mode enabled.")
  51. # Add your actual command logic here
  52. print("Executing command...")
  54. if __name__ == "__main__":
  55. my_command("input.txt", "output", verbose=True)
  56. my_command("input.txt", "output") # Dry run

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