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2 years ago
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<!DOCTYPE HTML>
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<html lang="en" class="sidebar-visible no-js colibri">
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<head>
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<!-- Book generated using mdBook -->
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<title>Adding Indent Queries</title>
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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="../hooks.html"><strong aria-hidden="true">4.3.</strong> Hooks</a></li><li class="chapter-item expanded "><a href="../languages.html"><strong aria-hidden="true">4.4.</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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<div id="content" class="content">
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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 occurences 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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</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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</ul>
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</main>
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<nav class="nav-wrapper" aria-label="Page navigation">
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<!-- Mobile navigation buttons -->
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<a rel="prev" href="../guides/textobject.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
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</a>
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<div style="clear: both"></div>
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<a rel="prev" href="../guides/textobject.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
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<script type="text/javascript">
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window.playground_copyable = true;
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</script>
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