Utilize add_subparsers to unify CLI

[Sawood Alam]

It looks like argparse is being used in individual actions which is then called from bin/hc where a top-level command (i.e., hc) implements arg parsing manually. We could perhaps use add_subparsers in the entrypoint script to leverage built-in capabilities on the standard argument parser package. We have used this technique in some of the other WSDL projects.

[Shawn M. Jones]

I've experimented with this successfully. What other WSDL projects have used it successfully?

[Sawood Alam]

What other WSDL projects have used it successfully?

• MementoMap
• IPWB

[Shawn M. Jones]

Thanks! I'll review that code and see what I can adapt.

[Shawn M. Jones]

This was completed by aa8bdaa as part of the IIPC 2021 DSA Grant.