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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" class="active"><strong aria-hidden="true">5.3.</strong> Adding indent queries</a></li></ol></li></ol>
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<main>
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<h1 id="adding-indent-queries"><a class="header" href="#adding-indent-queries">Adding indent queries</a></h1>
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<p>Helix uses tree-sitter to correctly indent new lines. This requires
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a tree-sitter grammar and an <code>indent.scm</code> query file placed in
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<code>runtime/queries/{language}/indents.scm</code>. The indentation for a line
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is calculated by traversing the syntax tree from the lowest node at the
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beginning of the new line. Each of these nodes contributes to the total
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indent when it is captured by the query (in what way depends on the name
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of the capture).</p>
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<p>Note that it matters where these added indents begin. For example,
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multiple indent level increases that start on the same line only increase
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the total indent level by 1.</p>
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<h2 id="scopes"><a class="header" href="#scopes">Scopes</a></h2>
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<p>Added indents don't always apply to the whole node. For example, in most
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cases when a node should be indented, we actually only want everything
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except for its first line to be indented. For this, there are several
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scopes (more scopes may be added in the future if required):</p>
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<ul>
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<li>
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<p><code>all</code>:
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This scope applies to the whole captured node. This is only different from
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<code>tail</code> when the captured node is the first node on its line.</p>
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</li>
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<li>
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<p><code>tail</code>:
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This scope applies to everything except for the first line of the
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captured node.</p>
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</li>
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</ul>
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<p>Every capture type has a default scope which should do the right thing
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in most situations. When a different scope is required, this can be
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changed by using a <code>#set!</code> declaration anywhere in the pattern:</p>
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<pre><code class="language-scm">(assignment_expression
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right: (_) @indent
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(#set! "scope" "all"))
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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>@indent</code> (default scope <code>tail</code>):
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Increase the indent level by 1. Multiple occurrences in the same line
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don't stack. If there is at least one <code>@indent</code> and one <code>@outdent</code>
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capture on the same line, the indent level isn't changed at all.</p>
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</li>
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<li>
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<p><code>@outdent</code> (default scope <code>all</code>):
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Decrease the indent level by 1. The same rules as for <code>@indent</code> apply.</p>
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</li>
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<li>
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<p><code>@extend</code>:
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Extend the range of this node to the end of the line and to lines that
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are indented more than the line that this node starts on. This is useful
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for languages like Python, where for the purpose of indentation some nodes
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(like functions or classes) should also contain indented lines that follow them.</p>
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</li>
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<li>
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<p><code>@extend.prevent-once</code>:
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Prevents the first extension of an ancestor of this node. For example, in Python
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a return expression always ends the block that it is in. Note that this only stops the
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extension of the next <code>@extend</code> capture. If multiple ancestors are captured,
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only the extension of the innermost one is prevented. All other ancestors are unaffected
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(regardless of whether the innermost ancestor would actually have been extended).</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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<p>In some cases, an S-expression cannot express exactly what pattern should be matched.
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For that, tree-sitter allows for predicates to appear anywhere within a pattern,
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similar to how <code>#set!</code> declarations work:</p>
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<pre><code class="language-scm">(some_kind
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(child_kind) @indent
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(#predicate? arg1 arg2 ...)
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)
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</code></pre>
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<p>The number of arguments depends on the predicate that's used.
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Each argument is either a capture (<code>@name</code>) or a string (<code>"some string"</code>).
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The following predicates are supported by tree-sitter:</p>
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<ul>
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<li>
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<p><code>#eq?</code>/<code>#not-eq?</code>:
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The first argument (a capture) must/must not 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>/<code>#not-match?</code>:
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The first argument (a capture) must/must not 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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<p>Additionally, we support some custom predicates for indent queries:</p>
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<ul>
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<li>
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<p><code>#not-kind-eq?</code>:
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The kind of the first argument (a capture) must not be equal to the second
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argument (a string).</p>
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</li>
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<li>
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<p><code>#same-line?</code>/<code>#not-same-line?</code>:
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The captures given by the 2 arguments must/must not start on the same line.</p>
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</li>
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