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< h2 id = "adding-injection-queries" > < a class = "header" href = "#adding-injection-queries" > Adding Injection Queries< / a > < / h2 >
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< p > Writing language injection queries allows one to highlight a specific node as a different language.
In addition to the < a href = "http://tree-sitter.github.io/tree-sitter/syntax-highlighting#language-injection" > standard< / a > language injection options used by tree-sitter, there
are a few Helix specific extensions that allow for more control.< / p >
< p > And example of a simple query that would highlight all strings as bash in Nix:< / p >
< pre > < code class = "language-scm" > ((string_expression (string_fragment) @injection.content)
(#set! injection.language "bash"))
< / code > < / pre >
< h2 id = "capture-types" > < a class = "header" href = "#capture-types" > Capture Types< / a > < / h2 >
< ul >
< li >
< p > < code > @injection.language< / code > (standard):
The captured node may contain the language name used to highlight the node captured by
< code > @injection.content< / code > .< / p >
< / li >
< li >
< p > < code > @injection.content< / code > (standard):
Marks the content to be highlighted as the language captured with < code > @injection.language< / code > < em > et al< / em > .< / p >
< / li >
< li >
< p > < code > @injection.filename< / code > (extension):
The captured node may contain a filename with a file-extension known to Helix,
highlighting < code > @injection.content< / code > as that language. This uses the language extensions defined in
both the default languages.toml distributed with Helix, as well as user defined languages.< / p >
< / li >
< li >
< p > < code > @injection.shebang< / code > (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 < code > languages.toml< / code > .< / p >
< / li >
< / ul >
< h2 id = "settings" > < a class = "header" href = "#settings" > Settings< / a > < / h2 >
< ul >
< li >
< p > < code > injection.combined< / code > (standard):
Indicates that all the matching nodes in the tree should have their content parsed as one
nested document.< / p >
< / li >
< li >
< p > < code > injection.language< / code > (standard):
Forces the captured content to be highlighted as the given language< / p >
< / li >
< li >
< p > < code > injection.include-children< / code > (standard):
Indicates that the content node’
nodes. By default, child nodes’ < / p >
< / li >
< li >
< p > < code > injection.include-unnamed-children< / code > (extension):
Same as < code > injection.include-children< / code > but only for unnamed child nodes.< / p >
< / li >
< / ul >
< h2 id = "predicates" > < a class = "header" href = "#predicates" > Predicates< / a > < / h2 >
< ul >
< li >
< p > < code > #eq?< / code > (standard):
The first argument (a capture) must be equal to the second argument
(a capture or a string).< / p >
< / li >
< li >
< p > < code > #match?< / code > (standard):
The first argument (a capture) must match the regex given in the
second argument (a string).< / p >
< / li >
< li >
< p > < code > #any-of?< / code > (standard):
The first argument (a capture) must be one of the other arguments (strings).< / p >
< / li >
< / ul >
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