Basic language support for Fennel. Might even work.

[icefoxen]

Closes #3846 . After pondering it (for two years) it seems obvious that having a single grammar that tries to cover multiple Lisps is silly.

There are two different tree-sitter parsers for Fennel mentioned in that issue:

• https://github.com/travonted/tree-sitter-fennel
• https://github.com/alexmozaidze/tree-sitter-fennel

This PR has mostly-arbitrarily chosen the second one. There's also several different highlights.scm options, I've mostly chosen the most recent one but tried to incorporate bits and pieces from the others where I could find them.

[micampe]

also need to add fnlm to the file types.

[icefoxen]

Added, thanks.

[the-mikedavis]

You can run cargo xtask docgen and commit the changes to fix the docs CI.

Might even work.

I realize this statement is probably meant as a joke but you have tested this patch, right? You can use cargo run to run a debug build which will use these queries.

[the-mikedavis]

It looks like this revision is fairly old. Is there any reason not to use the latest commit?

[icefoxen]

Jokes aside, yes I've tested it, but probably not as thoroughly as I should. Lots of my PR's come out of catharsis and then get mopped up after the fact if it turns out that anyone is actually interested in them. I swear I got this to work via some kind of cursed flailing around, but upon trying again to do it right better, it doesn't seem to do the syntax highlighting.

$ HELIX_RUNTIME=~/tmp/helix/runtime cargo run -- --health fennel
Configured language servers:
  ✓ fennel-ls: ~/.local/bin/fennel-ls
Configured debug adapter: None
Configured formatter: fnlfmt
Binary for formatter: ~/.local/bin/fnlfmt
Tree-sitter parser: ✓
Highlight queries: ✓
Textobject queries: ✘
Indent queries: ✘

Off to a good start? helix/runtime/queries/fennel/highlights.scm is present and Helix claims the language is set to fennel, but no highlighting. Any pointers on how to debug this?

[uncenter]

I'm getting this cryptic log error, of which I've seen before and not exactly sure how to solve 😓

2025-04-08T16:25:31.777 helix_core::syntax [ERROR] Could not parse queries for language "fennel". Are your grammars out of sync? Try running 'hx --grammar fetch' and 'hx --grammar build'. This query could not be parsed: QueryError { row: 132, column: 7, offset: 3284, message: "", kind: NodeType }