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216 lines
14 KiB
HTML
216 lines
14 KiB
HTML
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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" class="active"><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></ol></li></ol>
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<div id="content" class="content">
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<main>
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<h1 id="adding-languages"><a class="header" href="#adding-languages">Adding languages</a></h1>
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<h2 id="language-configuration"><a class="header" href="#language-configuration">Language configuration</a></h2>
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<p>To add a new language, you need to add a <code>[[language]]</code> entry to the
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<code>languages.toml</code> (see the <a href="../languages.html">language configuration section</a>).</p>
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<p>When adding a new language or Language Server configuration for an existing
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language, run <code>cargo xtask docgen</code> to add the new configuration to the
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<a href="../lang-support.html">Language Support</a> docs before creating a pull request.
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When adding a Language Server configuration, be sure to update the
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<a href="https://github.com/helix-editor/helix/wiki/How-to-install-the-default-language-servers">Language Server Wiki</a> with installation notes.</p>
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<h2 id="grammar-configuration"><a class="header" href="#grammar-configuration">Grammar configuration</a></h2>
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<p>If a tree-sitter grammar is available for the language, add a new <code>[[grammar]]</code>
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entry to <code>languages.toml</code>.</p>
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<p>You may use the <code>source.path</code> key rather than <code>source.git</code> with an absolute path
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to a locally available grammar for testing, but switch to <code>source.git</code> before
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submitting a pull request.</p>
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<h2 id="queries"><a class="header" href="#queries">Queries</a></h2>
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<p>For a language to have syntax-highlighting and indentation among
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other things, you have to add queries. Add a directory for your
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language with the path <code>runtime/queries/<name>/</code>. The tree-sitter
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<a href="https://tree-sitter.github.io/tree-sitter/syntax-highlighting#queries">website</a>
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gives more info on how to write queries.</p>
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<blockquote>
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<p>NOTE: When evaluating queries, the first matching query takes
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precedence, which is different from other editors like neovim where
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the last matching query supersedes the ones before it. See
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<a href="https://github.com/helix-editor/helix/pull/1170#issuecomment-997294090">this issue</a> for an example.</p>
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</blockquote>
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<h2 id="common-issues"><a class="header" href="#common-issues">Common Issues</a></h2>
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<ul>
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<li>
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<p>If you get errors when running after switching branches, you may have to update the tree-sitter grammars. Run <code>hx --grammar fetch</code> to fetch the grammars and <code>hx --grammar build</code> to build any out-of-date grammars.</p>
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</li>
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<li>
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<p>If a parser is segfaulting or you want to remove the parser, make sure to remove the compiled parser in <code>runtime/grammar/<name>.so</code></p>
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</li>
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</ul>
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