Initial basic Org markup support thanks to tree-sitter-org

[zetashift]

Using (and many thanks to):
https://github.com/milisims/tree-sitter-org
https://github.com/nvim-orgmode/orgmode/tree/master/queries/org

And the-mikedavis from the matrix chat. I think I need to add a few more things like docs, but I would like to first know and what I can add and what I can improve?
Ideally I'd want the headers to be a different colors each(I think this is a theming thing though) and property drawers to be colored different as well. Not entirely sure how to go about it?

[the-mikedavis]

This is looking good! For the docs, you'll need to run cargo xtask docgen and commit the changes. These queries will allow the headers to be highlighted differently but whether they'll be different colors is up to whichever theme you use. Here's a theme that has different colors set up.

[zetashift]

Alright pretty happy with this, I kind of want to have different highlights for TODO and DONE etc, but a tree-sitter parser shouldn't be responsible for that.

Also wanted a different query for links, but I couldn't find the query for that.

An example org file: https://writequit.org/denver-emacs/presentations/files/example.org.html

[the-mikedavis]

Giving this a try locally, I see that some markup is more difficult to highlight than I expected.

/foo bar baz/

won't match the

((expr) @markup.italic
 (#match? @markup.italic "/.*/"))

pattern because it gets parsed as three separate expr nodes. We could highlight a case like this with

(((expr) @markup.italic @_start
  (expr)* @markup.italic
  (expr) @markup.italic @_end)
 (#match? @_start "^/")
 (#match? @_end "/$"))

but I tried that locally and it degrades highlighting performance really bad. I think for now these queries are the best we can do. We could try out another parser, but milisims' seems like the best option of the available parsers. Ideally this parser should be refactored so it would parse markup into named nodes instead of leaving it to the queries. (I bet that this would be a pretty large refactor of the grammar though.)

[the-mikedavis]

looking good, just some nits about the formatting 👍

[the-mikedavis]

Nice work!