Webc language support

[vanarok]

Add webc grammar.

[the-mikedavis]

This will need a run of cargo xtask docgen to fix the CI

[johannesrave]

very cool! is there a way for me to use this now without waiting for the next release if i can't rabbithole into getting the buildchain up atm?

[johannesrave]

thanks for working on this @vanarok ! i have by now figured out how to compile helix from master, and now the new version is released for packaging too.

i have another question regarding the actual grammar though:
auto-formatting breaks indented frontmatter at the moment, for example with indented arrays:

---
layout: "_layouts/document.webc"
title: recent posts
pagination:
# these lines get un-indented on :fmt
  data: collections.post 
  size: 2
  alias: posts
  reverse: true---
<p>welcome to the rest of the page.</p>

looking at it with :tree-sitter-subtree the frontmatter is simply parsed as a string by the html-grammar.

i expected that the injections.scm in queries/webc somehow extends the html grammar-injections that webc uses as defined in the global languages.toml, and that i would be able to copy the yaml injections from the markdown-grammar:

; inherits: html
((minus_metadata) @injection.content (#set! injection.language "yaml") (#set! injection.include-unnamed-children))

however, i see no effect after recompiling or rebuilding the grammars on their own. is queries/webc even used if the languages.toml defines the grammar for webc to be html?

i tried working on this but have been unsuccessful, i just don't know enough about the whole build-chain.
i don't fully understand the interplay of the tree-sitter parsers that get pulled on build, the language-definitions and the queries-directories (with injections.scm).

edit: another thing that isn't yet working for me is comments with C-c in injected languages: for example inside a <style>-tag, the html-like comment style defined in languages.toml is still used.