Help working with tree-sitter injections

[tgross35]

Hello all,

I am working on improving injections for justfiles but struggling a bit. Without injections, I have the following trees

Which comes from the following

(external_command (_ 
  ["`" "```"] @punctuation.special))

That all looks fine. The problem comes when I want to add the below injection:

(external_command (_ ; match `backticked` or `backticked_indented`
  _ ; matches "`" or "```"
  body: (_)*) @injection.content
  (#set! injection.language "bash")
  (#set! injection.include-unnamed-children))

Something gets messed up in the highlighting. Triple backticks now get highlighted incorrectly

Relevant portions of the grammar are here:

    external_command: ($) => choice($.backticked, $.backticked_indented),
    backticked: (_) => seq("`", field("body", repeat(/[^`]/)), "`"),
    backticked_indented: (_) => seq("```", field("body", repeat(/./)), "```"),

A link to the full tree is at https://github.com/tgross35/tree-sitter-just/tree/6a37a75cbd1e49bf24fc53595b462e6766cc209c

I also need a way to extract {{...}} from within injections and parse them in the parent syntax to display interpolation. I'm not sure what the best way to go about this is - I could set the language to just, but I'm not sure how to make that interact with locals.scm.