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<ol class="chapter"><li class="chapter-item expanded affix "><a href="../title-page.html">Helix</a></li><li class="chapter-item expanded "><a href="../install.html"><strong aria-hidden="true">1.</strong> Installation</a></li><li class="chapter-item expanded "><a href="../usage.html"><strong aria-hidden="true">2.</strong> Usage</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../keymap.html"><strong aria-hidden="true">2.1.</strong> Keymap</a></li><li class="chapter-item expanded "><a href="../commands.html"><strong aria-hidden="true">2.2.</strong> Commands</a></li><li class="chapter-item expanded "><a href="../lang-support.html"><strong aria-hidden="true">2.3.</strong> Language support</a></li></ol></li><li class="chapter-item expanded "><a href="../from-vim.html"><strong aria-hidden="true">3.</strong> Migrating from Vim</a></li><li class="chapter-item expanded "><a href="../configuration.html"><strong aria-hidden="true">4.</strong> Configuration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../themes.html"><strong aria-hidden="true">4.1.</strong> Themes</a></li><li class="chapter-item expanded "><a href="../remapping.html"><strong aria-hidden="true">4.2.</strong> Key remapping</a></li><li class="chapter-item expanded "><a href="../languages.html"><strong aria-hidden="true">4.3.</strong> Languages</a></li></ol></li><li class="chapter-item expanded "><a href="../guides/index.html"><strong aria-hidden="true">5.</strong> Guides</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../guides/adding_languages.html"><strong aria-hidden="true">5.1.</strong> Adding languages</a></li><li class="chapter-item expanded "><a href="../guides/textobject.html"><strong aria-hidden="true">5.2.</strong> Adding textobject queries</a></li><li class="chapter-item expanded "><a href="../guides/indent.html"><strong aria-hidden="true">5.3.</strong> Adding indent queries</a></li><li class="chapter-item expanded "><a href="../guides/injection.html" class="active"><strong aria-hidden="true">5.4.</strong> Adding injection queries</a></li></ol></li></ol>
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<main>
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<h1 id="adding-injection-queries"><a class="header" href="#adding-injection-queries">Adding Injection Queries</a></h1>
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<p>Writing language injection queries allows one to highlight a specific node as a different language.
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In addition to the <a href="upstream-docs">standard</a> language injection options used by tree-sitter, there
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are a few Helix specific extensions that allow for more control.</p>
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<p>And example of a simple query that would highlight all strings as bash in Nix:</p>
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<pre><code class="language-scm">((string_expression (string_fragment) @injection.content)
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(#set! injection.language "bash"))
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</code></pre>
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<h2 id="capture-types"><a class="header" href="#capture-types">Capture Types</a></h2>
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<ul>
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<li>
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<p><code>@injection.language</code> (standard):
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The captured node may contain the language name used to highlight the node captured by
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<code>@injection.content</code>.</p>
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</li>
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<li>
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<p><code>@injection.content</code> (standard):
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Marks the content to be highlighted as the language captured with <code>@injection.language</code> <em>et al</em>.</p>
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</li>
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<li>
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<p><code>@injection.filename</code> (extension):
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The captured node may contain a filename with a file-extension known to Helix,
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highlighting <code>@injection.content</code> as that language. This uses the language extensions defined in
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both the default languages.toml distributed with Helix, as well as user defined languages.</p>
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</li>
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<li>
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<p><code>@injection.shebang</code> (extension):
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The captured node may contain a shebang used to choose a language to highlight as. This also uses
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the shebangs defined in the default and user <code>languages.toml</code>.</p>
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</li>
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</ul>
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<h2 id="settings"><a class="header" href="#settings">Settings</a></h2>
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<ul>
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<li>
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<p><code>injection.combined</code> (standard):
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Indicates that all the matching nodes in the tree should have their content parsed as one
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nested document.</p>
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</li>
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<li>
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<p><code>injection.language</code> (standard):
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Forces the captured content to be highlighted as the given language</p>
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</li>
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<li>
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<p><code>injection.include-children</code> (standard):
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Indicates that the content node’s entire text should be re-parsed, including the text of its child
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nodes. By default, child nodes’ text will be excluded from the injected document.</p>
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</li>
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<li>
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<p><code>injection.include-unnamed-children</code> (extension):
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Same as <code>injection.include-children</code> but only for unnamed child nodes.</p>
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</li>
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</ul>
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<h2 id="predicates"><a class="header" href="#predicates">Predicates</a></h2>
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<ul>
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<li>
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<p><code>#eq?</code> (standard):
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The first argument (a capture) must be equal to the second argument
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(a capture or a string).</p>
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</li>
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<li>
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<p><code>#match?</code> (standard):
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The first argument (a capture) must match the regex given in the
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second argument (a string).</p>
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</li>
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</ul>
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