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Hi @rasbt,
This PR introduces a Command Line Interface (CLI) for watermark, as discussed in issue #60. This enables the tool to be used in non-Python kernels (like R) or directly from the terminal via system("watermark") or shell commands.
Key Implementation Details:
Zero Dependencies: I chose to use the built-in argparse library instead of external tools like click. This keeps the package lightweight and avoids adding new dependencies, following your preference mentioned in the issue comments.
Entry Point: Added console_scripts to setup.py so that users can run watermark globally after installation.
Feature Parity: The CLI currently supports the most used flags:
-a / --author (Handles multi-word names with spaces/quotes).
-v / --python (Python version).
-p / --packages (Comma-separated package versions).