Add help to all CLI tools provides by pymca

[woutdenolf]

pymca --help
option --help not recognized

pymca -h
option -h not recognized

argparse.ArgumentParser normally adds this.

[vasole]

In case it helps, there are man pages, but probably they are not accessible unless PyMca is installed as a system package.

https://github.com/silx-kit/pymca/tree/master/doc/man

[sergey-yaroslavtsev]

Based on man/pymca.1 we can add longoption to PyMcaMain like:

elif opt in ('-h', '--help'):
    print("""\

PyMca X-Ray Fluorescence Toolkit main application.

Usage: pymca [OPTION]... [FILE]

Options:
  -f
        Bypass user-defined default settings

  --nativefiledialogs=X
        Use native file dialogs (X=1) or Qt dialogs (X=0)

  --backend=XX
        Select graphics backend:
        mpl (matplotlib), gl (OpenGL), silx

  --binding=XX
        Select Qt binding:
        PyQt5 (default), PyQt6, PySide6, PySide2

  --logging=LEVEL
        Set logging level:
        critical, error, warning (default), info, debug
        or numeric values 0 (critical) to 4 (debug)

  --test
        Run PyMca unit tests and exit

  -h, --help
        Show this help message and exit

If FILE is provided, it will be opened if the format is supported.
""")
    sys.exit(0)

argparse.ArgumentParser normally adds this.

or we can introduce argparse instead of getoptto PyMcaMain.