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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" class="active"><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"><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="languages"><a class="header" href="#languages">Languages</a></h1>
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<p>Language-specific settings and settings for language servers are configured
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in <code>languages.toml</code> files.</p>
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<h2 id="languagestoml-files"><a class="header" href="#languagestoml-files"><code>languages.toml</code> files</a></h2>
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<p>There are three possible <code>languages.toml</code> files. The first is compiled into
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Helix and lives in the <a href="https://github.com/helix-editor/helix/blob/master/languages.toml">Helix repository</a>.
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This provides the default configurations for languages and language servers.</p>
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<p>You may define a <code>languages.toml</code> in your <a href="./configuration.html">configuration directory</a>
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which overrides values from the built-in language configuration. For example
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to disable auto-LSP-formatting in Rust:</p>
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<pre><code class="language-toml"># in <config_dir>/helix/languages.toml
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[[language]]
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name = "rust"
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auto-format = false
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</code></pre>
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<p>Language configuration may also be overridden local to a project by creating
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a <code>languages.toml</code> file under a <code>.helix</code> directory. Its settings will be merged
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with the language configuration in the configuration directory and the built-in
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configuration.</p>
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<h2 id="language-configuration"><a class="header" href="#language-configuration">Language configuration</a></h2>
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<p>Each language is configured by adding a <code>[[language]]</code> section to a
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<code>languages.toml</code> file. For example:</p>
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<pre><code class="language-toml">[[language]]
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name = "mylang"
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scope = "source.mylang"
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injection-regex = "^mylang$"
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file-types = ["mylang", "myl"]
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comment-token = "#"
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indent = { tab-width = 2, unit = " " }
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language-server = { command = "mylang-lsp", args = ["--stdio"] }
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</code></pre>
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<p>These configuration keys are available:</p>
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<table><thead><tr><th>Key</th><th>Description</th></tr></thead><tbody>
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<tr><td><code>name</code></td><td>The name of the language</td></tr>
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<tr><td><code>scope</code></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><code>injection-regex</code></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><code>file-types</code></td><td>The filetypes of the language, for example <code>["yml", "yaml"]</code>. Extensions and full file names are supported.</td></tr>
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<tr><td><code>shebangs</code></td><td>The interpreters from the shebang line, for example <code>["sh", "bash"]</code></td></tr>
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<tr><td><code>roots</code></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><code>auto-format</code></td><td>Whether to autoformat this language when saving</td></tr>
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<tr><td><code>diagnostic-severity</code></td><td>Minimal severity of diagnostic for it to be displayed. (Allowed values: <code>Error</code>, <code>Warning</code>, <code>Info</code>, <code>Hint</code>)</td></tr>
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<tr><td><code>comment-token</code></td><td>The token to use as a comment-token</td></tr>
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<tr><td><code>indent</code></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><code>language-server</code></td><td>The Language Server to run. See the Language Server configuration section below.</td></tr>
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<tr><td><code>config</code></td><td>Language Server configuration</td></tr>
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<tr><td><code>grammar</code></td><td>The tree-sitter grammar to use (defaults to the value of <code>name</code>)</td></tr>
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</tbody></table>
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<h3 id="language-server-configuration"><a class="header" href="#language-server-configuration">Language Server configuration</a></h3>
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<p>The <code>language-server</code> field takes the following keys:</p>
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<table><thead><tr><th>Key</th><th>Description</th></tr></thead><tbody>
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<tr><td><code>command</code></td><td>The name of the language server binary to execute. Binaries must be in <code>$PATH</code></td></tr>
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<tr><td><code>args</code></td><td>A list of arguments to pass to the language server binary</td></tr>
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<tr><td><code>timeout</code></td><td>The maximum time a request to the language server may take, in seconds. Defaults to <code>20</code></td></tr>
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<tr><td><code>language-id</code></td><td>The language name to pass to the language server. Some language servers support multiple languages and use this field to determine which one is being served in a buffer</td></tr>
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</tbody></table>
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<p>The top-level <code>config</code> field is used to configure the LSP initialization options. A <code>format</code>
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sub-table within <code>config</code> can be used to pass extra formatting options to
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<a href="https://github.com/microsoft/language-server-protocol/blob/gh-pages/_specifications/specification-3-16.md#document-formatting-request--leftwards_arrow_with_hook">Document Formatting Requests</a>.
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For example with typescript:</p>
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<pre><code class="language-toml">[[language]]
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name = "typescript"
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auto-format = true
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# pass format options according to https://github.com/typescript-language-server/typescript-language-server#workspacedidchangeconfiguration omitting the "[language].format." prefix.
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config = { format = { "semicolons" = "insert", "insertSpaceBeforeFunctionParenthesis" = true } }
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</code></pre>
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<h2 id="tree-sitter-grammar-configuration"><a class="header" href="#tree-sitter-grammar-configuration">Tree-sitter grammar configuration</a></h2>
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<p>The source for a language's tree-sitter grammar is specified in a <code>[[grammar]]</code>
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section in <code>languages.toml</code>. For example:</p>
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<pre><code class="language-toml">[[grammar]]
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name = "mylang"
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source = { git = "https://github.com/example/mylang", rev = "a250c4582510ff34767ec3b7dcdd3c24e8c8aa68" }
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</code></pre>
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<p>Grammar configuration takes these keys:</p>
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<table><thead><tr><th>Key</th><th>Description</th></tr></thead><tbody>
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<tr><td><code>name</code></td><td>The name of the tree-sitter grammar</td></tr>
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<tr><td><code>source</code></td><td>The method of fetching the grammar - a table with a schema defined below</td></tr>
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</tbody></table>
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<p>Where <code>source</code> is a table with either these keys when using a grammar from a
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git repository:</p>
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<table><thead><tr><th>Key</th><th>Description</th></tr></thead><tbody>
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<tr><td><code>git</code></td><td>A git remote URL from which the grammar should be cloned</td></tr>
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<tr><td><code>rev</code></td><td>The revision (commit hash or tag) which should be fetched</td></tr>
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<tr><td><code>subpath</code></td><td>A path within the grammar directory which should be built. Some grammar repositories host multiple grammars (for example <code>tree-sitter-typescript</code> and <code>tree-sitter-ocaml</code>) in subdirectories. This key is used to point <code>hx --grammar build</code> to the correct path for compilation. When omitted, the root of repository is used</td></tr>
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</tbody></table>
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<h3 id="choosing-grammars"><a class="header" href="#choosing-grammars">Choosing grammars</a></h3>
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<p>You may use a top-level <code>use-grammars</code> key to control which grammars are
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fetched and built when using <code>hx --grammar fetch</code> and <code>hx --grammar build</code>.</p>
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<pre><code class="language-toml"># Note: this key must come **before** the [[language]] and [[grammar]] sections
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use-grammars = { only = [ "rust", "c", "cpp" ] }
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# or
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use-grammars = { except = [ "yaml", "json" ] }
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</code></pre>
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<p>When omitted, all grammars are fetched and built.</p>
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