Adding Injection Queries

Writing language injection queries allows one to highlight a specific node as a different language. -In addition to the standard language injection options used by tree-sitter, there -are a few Helix specific extensions that allow for more control.

And example of a simple query that would highlight all strings as bash in Nix:

((string_expression (string_fragment) @injection.content)
-  (#set! injection.language "bash"))
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Capture Types

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@injection.language (standard): -The captured node may contain the language name used to highlight the node captured by -@injection.content.
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@injection.content (standard): -Marks the content to be highlighted as the language captured with @injection.language et al.
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@injection.filename (extension): -The captured node may contain a filename with a file-extension known to Helix, -highlighting @injection.content as that language. This uses the language extensions defined in -both the default languages.toml distributed with Helix, as well as user defined languages.
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@injection.shebang (extension): -The captured node may contain a shebang used to choose a language to highlight as. This also uses -the shebangs defined in the default and user languages.toml.
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Settings

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injection.combined (standard): -Indicates that all the matching nodes in the tree should have their content parsed as one -nested document.
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injection.language (standard): -Forces the captured content to be highlighted as the given language
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injection.include-children (standard): -Indicates that the content node’s entire text should be re-parsed, including the text of its child -nodes. By default, child nodes’ text will be excluded from the injected document.
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injection.include-unnamed-children (extension): -Same as injection.include-children but only for unnamed child nodes.
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Predicates

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#eq? (standard): -The first argument (a capture) must be equal to the second argument -(a capture or a string).
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#match? (standard): -The first argument (a capture) must match the regex given in the -second argument (a string).
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