stylix: replacing the builtin color scheme generation engine with matugen

[make-42]

This PR is meant to further the discussion in (#694).

I believe matugen could be a good candidate for replacing the builtin color scheme generation engine stylix currently uses and this PR serves as a demo for it.

The code is not final:

• the old engine is still in the codebase
• polarity doesn't work like it's supposed to (it selects the color scheme and "either" defaults to black)
• a lightnessScale parameter could also be implemented as in: stylix: add darker and even-darker polarities #694
• the choice of colors used in the dark and light themes might need to be changed.

However this is what it looks like:

[make-42]

primaryScale parameters have been implemented

[make-42]

primaryScale.dark = -0.05; gives you:

and primaryScale.dark = -0.1; gives you:

[danth]

This is definitely an improvement over the current generator, at least when I tried it on my own wallpaper :)

As this is still a WIP I've just left a couple of comments.

[danth]

To keep the garbage collection stuff working, stylix.generated.json should just be the raw-palette.json derivation without any further processing. The importing, processing, etc should be under stylix.generated.palette, and there's no need to write the processed theme back to a file.

[danth]

Consider grouping all the new options into a subcategory, to make it clear that they're only for generated themes.

Perhaps also move the polarity option into that category (unless you're planning to remove it).

[danth]

Consider using one of lib.types.coercedTo, lib.mkChangedOptionModule, lib.mkRemovedOptionModule, etc to handle changes to the polarity option.

[make-42]

Okay, I'll work on cleaning this up, do I remove the code for the old palette-generator or do I make an option to have it be selectable for legacy purposes?

[make-42]

I fixed all of the issues that you brought up.

[make-42]

Do you want me to create a gallery of different color scheme options?

[make-42]

although for some reason, i can't get the removed option warning to show up

[make-42]

that was an easy fix...

[Flameopathic]

very cool! will this be able to extend to generating a base24 or vim highlight group scheme?