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<h1 id="adding-injection-queries"><a class="header" href="#adding-injection-queries">Adding Injection Queries</a></h1>
<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’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.</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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