Support tree-sitter-markdown highlight groups

[jose-elias-alvarez]

MDeiml/tree-sitter-markdown is a new Markdown parser for Treesitter that (among other things) improves speed and uses Treesitter to highlight embedded code blocks.The parser is still experimental, but it's already a big improvement over traditional syntax highlighting, so it would be great to have support for it here. I asked the author on Reddit how colorschemes can support it, and they said:

They would need to add colors for the highlight groups TSTitle, TSLiteral, TSEmphasis, TSStrong, TSURI, TSTextReference, TSPunctSpecial and TSStringEscape.

For reference, this commit shows how Catpuccin implemented support.

[rmehri01]

Thanks for letting me know and for the extra details! This looks really nice, I really like the highlighting in code blocks. These groups already exist so I think it looks decent now but I added some colors for TSStrong and TSEmphasis, what do you think:

I also might go back and revise the regex based markdown groups since some of them seem to overlap.

[jose-elias-alvarez]

Looks great! I should have been more specific about what seemed to be missing, and bold / italic colors make a big difference. I also wonder if a different color for link titles would help. Here's a couple of links with Treesitter:

And without:

The latter seems a bit easier to parse, but what do you think?

[rmehri01]

Ah I see, yeah I like the cyan more! Do you have any other suggestions for the markdown colors, either with or without Treesitter? I just have those 3 changes so far:

[jose-elias-alvarez]

Looks great as-is IMO!