Adding basic Mojo lexer

[hroemer]

basic implementation for #2515 based upon PythonLexer

[Anteru]

This needs an example file, otherwise we can't merge this. A basic .mojo file should suffice (and make sure to update the golden test outputs.) See: https://pygments.org/docs/lexerdevelopment/#how-to-test-your-lexer

[hroemer]

Thanks for guiding me along. I tested it locally (e.g. pygments -O full,style=emacs,linenos=1 -o test.html ...) and unfortunately was in a little rush here not reading the docs. I will add an according test file and output in the next couple of days, hopefully doing it more properly that time.

[hroemer]

@Anteru I am currently struggling with tox. The command mentioned in the docs is not working out for me. I get tox: error: unrecognized arguments: --update-goldens. It works when adding the run command, but I cannot reason about the output, yet.

I guess I need to dig more into tox / pygments.

One general question as I don't have any experience with tox, but have done snapshot based testing (pytest / jest) in the past. Are the lexer tests similar to that?

Cheers

[jeanas]

The command mentioned in the docs is not working out for me. I get tox: error: unrecognized arguments: --update-goldens.

It's tox -- --update-goldens, mind the extra --.

One general question as I don't have any experience with tox, but have done snapshot based testing (pytest / jest) in the past. Are the lexer tests similar to that?

Yes. And they're done with pytest, tox is just a test runner which saves you the time to install pytest in a virtual environment.

[hroemer]

Thanks for your quick response and sorry for the delay. Github's device verification currently has a massive delay for emails. Login failed for 2 days now.

Actually I did use the double-dash, but I wasn't aware of tox automatic venv handling.
Thus, running tox "inside" another venv (PDM) didn't work out well.

Anyway, I got it working now and prepared snippets / examples.

[Anteru]

Merged, thanks!