Using Cleo instead of Argparse

Currently, Manim uses Argparse for handling CLI arguments. It has been good but hard to maintain it, the currently introduced subcommands make it worse. Using something which was built for CLI management would help a lot of something like Cleo.

Cleo allows us to create beautiful and testable command-line commands. (Picked from docs) Where it uses docstrings to generate a command argument. (Bonus it allow autocompletion https://cleo.readthedocs.io/en/latest/introduction.html#autocompletion).

Many projects use this for CLI for example poetry.

[leotrs]

You are very convincing. I vote we go with the one that is the most supported, but let’s do this after #620 is merged and stabilizes a bit.

Cc @ManimCommunity/core to hear from others.

[leotrs]

From the cleo documentation:

As you may have already seen, Cleo uses the command docstring to determine the command definition. The docstring must be in the following form :

I am strongly against introducing functionality in the docstrings, so I would vote against using cleo. Also, click seems to have a wider audience (and thus, possibly, better support).

However, the person who works on this should have final say, so let’s discuss once there’s a PR 🙂