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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="submodules"><a class="header" href="#submodules">Submodules</a></h2>
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<p>To add a new language, you should first add a tree-sitter submodule. To do this,
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you can run the command</p>
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<pre><code class="language-sh">git submodule add -f <repository> helix-syntax/languages/tree-sitter-<name>
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</code></pre>
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<p>For example, to add tree-sitter-ocaml you would run</p>
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<pre><code class="language-sh">git submodule add -f https://github.com/tree-sitter/tree-sitter-ocaml helix-syntax/languages/tree-sitter-ocaml
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</code></pre>
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<p>Make sure the submodule is shallow by doing</p>
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<pre><code class="language-sh">git config -f .gitmodules submodule.helix-syntax/languages/tree-sitter-<name>.shallow true
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</code></pre>
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<p>or you can manually add <code>shallow = true</code> to <code>.gitmodules</code>.</p>
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<h2 id="languagestoml"><a class="header" href="#languagestoml">languages.toml</a></h2>
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<p>Next, you need to add the language to the <a href="https://github.com/helix-editor/helix/blob/master/languages.toml"><code>languages.toml</code></a> found in the root of
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the repository; this <code>languages.toml</code> file is included at compilation time, and
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is distinct from the <code>language.toml</code> file in the user's <a href="../configuration.html">configuration
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directory</a>.</p>
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<p>These are the available keys and descriptions for the file.</p>
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<table><thead><tr><th>Key</th><th>Description</th></tr></thead><tbody>
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<tr><td>name</td><td>The name of the language</td></tr>
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<tr><td>scope</td><td>A string like <code>source.js</code> that identifies the language. Currently, we strive to match the scope names used by popular TextMate grammars and by the Linguist library. Usually <code>source.<name></code> or <code>text.<name></code> in case of markup languages</td></tr>
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<tr><td>injection-regex</td><td>regex pattern that will be tested against a language name in order to determine whether this language should be used for a potential <a href="https://tree-sitter.github.io/tree-sitter/syntax-highlighting#language-injection">language injection</a> site.</td></tr>
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<tr><td>file-types</td><td>The filetypes of the language, for example <code>["yml", "yaml"]</code></td></tr>
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<tr><td>shebangs</td><td>The interpreters from the shebang line, for example <code>["sh", "bash"]</code></td></tr>
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<tr><td>roots</td><td>A set of marker files to look for when trying to find the workspace root. For example <code>Cargo.lock</code>, <code>yarn.lock</code></td></tr>
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<tr><td>auto-format</td><td>Whether to autoformat this language when saving</td></tr>
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<tr><td>comment-token</td><td>The token to use as a comment-token</td></tr>
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<tr><td>indent</td><td>The indent to use. Has sub keys <code>tab-width</code> and <code>unit</code></td></tr>
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<tr><td>config</td><td>Language server configuration</td></tr>
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</tbody></table>
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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 other things, you have to add queries. Add a directory for your language with the path <code>runtime/queries/<name>/</code>. The tree-sitter <a href="https://tree-sitter.github.io/tree-sitter/syntax-highlighting#queries">website</a> gives more info on how to write queries.</p>
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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 building after switching branches, you may have to remove or update tree-sitter submodules. You can update submodules by running</p>
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<pre><code class="language-sh">git submodule sync; git submodule update --init
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</code></pre>
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</li>
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<li>
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<p>Make sure to not use the <code>--remote</code> flag. To remove submodules look inside the <code>.gitmodules</code> and remove directories that are not present inside of it.</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 submodule <em>and</em> the compiled parser in <code>runtime/grammar/<name>.so</code></p>
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</li>
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<li>
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<p>The indents query is <code>indents.toml</code>, <em>not</em> <code>indents.scm</code>. See <a href="https://github.com/helix-editor/helix/issues/114">this</a> issue for more information.</p>
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