<!DOCTYPE HTML>
< html lang = "en" class = "sidebar-visible no-js colibri" >
< head >
<!-- Book generated using mdBook -->
< meta charset = "UTF-8" >
< title > Languages< / title >
<!-- Custom HTML head -->
< meta content = "text/html; charset=utf-8" http-equiv = "Content-Type" >
< meta name = "description" content = "" >
< meta name = "viewport" content = "width=device-width, initial-scale=1" >
< meta name = "theme-color" content = "#ffffff" / >
< link rel = "icon" href = "favicon.svg" >
< link rel = "shortcut icon" href = "favicon.png" >
< link rel = "stylesheet" href = "css/variables.css" >
< link rel = "stylesheet" href = "css/general.css" >
< link rel = "stylesheet" href = "css/chrome.css" >
< link rel = "stylesheet" href = "css/print.css" media = "print" >
<!-- Fonts -->
< link rel = "stylesheet" href = "FontAwesome/css/font-awesome.css" >
< link rel = "preconnect" href = "https://fonts.gstatic.com" >
< link href = "https://fonts.googleapis.com/css2?family=Inter:wght@200;400;500;700&display=swap" rel = "stylesheet" >
< link rel = "stylesheet" href = "fonts/fonts.css" >
<!-- Highlight.js Stylesheets -->
< link rel = "stylesheet" href = "highlight.css" >
< link rel = "stylesheet" href = "tomorrow-night.css" >
< link rel = "stylesheet" href = "ayu-highlight.css" >
<!-- Custom theme stylesheets -->
< / head >
< body >
<!-- Provide site root to javascript -->
< script type = "text/javascript" >
var path_to_root = "";
var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "colibri" : "colibri";
< / script >
<!-- Work around some values being stored in localStorage wrapped in quotes -->
< script type = "text/javascript" >
try {
var theme = localStorage.getItem('mdbook-theme');
var sidebar = localStorage.getItem('mdbook-sidebar');
if (theme.startsWith('"') & & theme.endsWith('"')) {
localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
}
if (sidebar.startsWith('"') & & sidebar.endsWith('"')) {
localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
}
} catch (e) { }
< / script >
<!-- Set the theme before any content is loaded, prevents flash -->
< script type = "text/javascript" >
var theme;
try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
if (theme === null || theme === undefined) { theme = default_theme; }
var html = document.querySelector('html');
html.classList.remove('no-js')
html.classList.remove('colibri')
html.classList.add(theme);
html.classList.add('js');
< / script >
<!-- Hide / unhide sidebar before it is displayed -->
< script type = "text/javascript" >
var html = document.querySelector('html');
var sidebar = 'hidden';
if (document.body.clientWidth >= 1080) {
try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
sidebar = sidebar || 'visible';
}
html.classList.remove('sidebar-visible');
html.classList.add("sidebar-" + sidebar);
< / script >
< nav id = "sidebar" class = "sidebar" aria-label = "Table of contents" >
< div class = "sidebar-scrollbox" >
< 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 >
< / div >
< div id = "sidebar-resize-handle" class = "sidebar-resize-handle" > < / div >
< / nav >
< div id = "page-wrapper" class = "page-wrapper" >
< div class = "page" >
< div id = "menu-bar-hover-placeholder" > < / div >
< div id = "menu-bar" class = "menu-bar sticky bordered" >
< div class = "left-buttons" >
< button id = "sidebar-toggle" class = "icon-button" type = "button" title = "Toggle Table of Contents" aria-label = "Toggle Table of Contents" aria-controls = "sidebar" >
< i class = "fa fa-bars" > < / i >
< / button >
< button id = "theme-toggle" class = "icon-button" type = "button" title = "Change theme" aria-label = "Change theme" aria-haspopup = "true" aria-expanded = "false" aria-controls = "theme-list" >
< i class = "fa fa-paint-brush" > < / i >
< / button >
< ul id = "theme-list" class = "theme-popup" aria-label = "Themes" role = "menu" >
< li role = "none" > < button role = "menuitem" class = "theme" id = "light" > Light< / button > < / li >
< li role = "none" > < button role = "menuitem" class = "theme" id = "rust" > Rust< / button > < / li >
< li role = "none" > < button role = "menuitem" class = "theme" id = "coal" > Coal< / button > < / li >
< li role = "none" > < button role = "menuitem" class = "theme" id = "navy" > Navy< / button > < / li >
< li role = "none" > < button role = "menuitem" class = "theme" id = "ayu" > Ayu< / button > < / li >
< li role = "none" > < button role = "menuitem" class = "theme" id = "colibri" > Colibri (default)< / button > < / li >
< / ul >
< button id = "search-toggle" class = "icon-button" type = "button" title = "Search. (Shortkey: s)" aria-label = "Toggle Searchbar" aria-expanded = "false" aria-keyshortcuts = "S" aria-controls = "searchbar" >
< i class = "fa fa-search" > < / i >
< / button >
< / div >
< h1 class = "menu-title" > < / h1 >
< div class = "right-buttons" >
< a href = "print.html" title = "Print this book" aria-label = "Print this book" >
< i id = "print-button" class = "fa fa-print" > < / i >
< / a >
< / div >
< / div >
< div id = "search-wrapper" class = "hidden" >
< form id = "searchbar-outer" class = "searchbar-outer" >
< input type = "search" name = "search" id = "searchbar" name = "searchbar" placeholder = "Search this book ..." aria-controls = "searchresults-outer" aria-describedby = "searchresults-header" >
< / form >
< div id = "searchresults-outer" class = "searchresults-outer hidden" >
< div id = "searchresults-header" class = "searchresults-header" > < / div >
< ul id = "searchresults" >
< / ul >
< / div >
< / div >
<!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
< script type = "text/javascript" >
document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
});
< / script >
< div id = "content" class = "content" >
< main >
< h1 id = "languages" > < a class = "header" href = "#languages" > Languages< / a > < / h1 >
< p > Language-specific settings and settings for language servers are configured
in < code > languages.toml< / code > files.< / p >
< h2 id = "languagestoml-files" > < a class = "header" href = "#languagestoml-files" > < code > languages.toml< / code > files< / a > < / h2 >
< p > There are three possible < code > languages.toml< / code > files. The first is compiled into
Helix and lives in the < a href = "https://github.com/helix-editor/helix/blob/master/languages.toml" > Helix repository< / a > .
This provides the default configurations for languages and language servers.< / p >
< p > You may define a < code > languages.toml< / code > in your < a href = "./configuration.html" > configuration directory< / a >
which overrides values from the built-in language configuration. For example
to disable auto-LSP-formatting in Rust:< / p >
< pre > < code class = "language-toml" > # in < config_dir> /helix/languages.toml
[[language]]
name = " rust"
auto-format = false
< / code > < / pre >
< p > Language configuration may also be overridden local to a project by creating
a < code > languages.toml< / code > file under a < code > .helix< / code > directory. Its settings will be merged
with the language configuration in the configuration directory and the built-in
configuration.< / p >
< h2 id = "language-configuration" > < a class = "header" href = "#language-configuration" > Language configuration< / a > < / h2 >
< p > Each language is configured by adding a < code > [[language]]< / code > section to a
< code > languages.toml< / code > file. For example:< / p >
< pre > < code class = "language-toml" > [[language]]
name = " mylang"
scope = " source.mylang"
injection-regex = " ^mylang$"
file-types = [" mylang" , " myl" ]
comment-token = " #"
indent = { tab-width = 2, unit = " " }
language-server = { command = " mylang-lsp" , args = [" --stdio" ] }
< / code > < / pre >
< p > These configuration keys are available:< / p >
< div class = "table-wrapper" > < table > < thead > < tr > < th > Key< / th > < th > Description< / th > < / tr > < / thead > < tbody >
< tr > < td > < code > name< / code > < / td > < td > The name of the language< / td > < / tr >
< 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 >
< 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 >
< 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 >
< tr > < td > < code > shebangs< / code > < / td > < td > The interpreters from the shebang line, for example < code > [" sh" , " bash" ]< / code > < / td > < / tr >
< 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 >
< tr > < td > < code > auto-format< / code > < / td > < td > Whether to autoformat this language when saving< / td > < / tr >
< 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 >
< tr > < td > < code > comment-token< / code > < / td > < td > The token to use as a comment-token< / td > < / tr >
< tr > < td > < code > indent< / code > < / td > < td > The indent to use. Has sub keys < code > tab-width< / code > and < code > unit< / code > < / td > < / tr >
< tr > < td > < code > language-server< / code > < / td > < td > The Language Server to run. See the Language Server configuration section below.< / td > < / tr >
< tr > < td > < code > config< / code > < / td > < td > Language Server configuration< / td > < / tr >
< tr > < td > < code > grammar< / code > < / td > < td > The tree-sitter grammar to use (defaults to the value of < code > name< / code > )< / td > < / tr >
< / tbody > < / table >
< / div >
< h3 id = "language-server-configuration" > < a class = "header" href = "#language-server-configuration" > Language Server configuration< / a > < / h3 >
< p > The < code > language-server< / code > field takes the following keys:< / p >
< div class = "table-wrapper" > < table > < thead > < tr > < th > Key< / th > < th > Description< / th > < / tr > < / thead > < tbody >
< 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 >
< tr > < td > < code > args< / code > < / td > < td > A list of arguments to pass to the language server binary< / td > < / tr >
< 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 >
< 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 >
< / tbody > < / table >
< / div >
< p > The top-level < code > config< / code > field is used to configure the LSP initialization options. A < code > format< / code >
sub-table within < code > config< / code > can be used to pass extra formatting options to
< 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 > .
For example with typescript:< / p >
< pre > < code class = "language-toml" > [[language]]
name = " typescript"
auto-format = true
# pass format options according to https://github.com/typescript-language-server/typescript-language-server#workspacedidchangeconfiguration omitting the " [language].format." prefix.
config = { format = { " semicolons" = " insert" , " insertSpaceBeforeFunctionParenthesis" = true } }
< / code > < / pre >
< h2 id = "tree-sitter-grammar-configuration" > < a class = "header" href = "#tree-sitter-grammar-configuration" > Tree-sitter grammar configuration< / a > < / h2 >
< p > The source for a language's tree-sitter grammar is specified in a < code > [[grammar]]< / code >
section in < code > languages.toml< / code > . For example:< / p >
< pre > < code class = "language-toml" > [[grammar]]
name = " mylang"
source = { git = " https://github.com/example/mylang" , rev = " a250c4582510ff34767ec3b7dcdd3c24e8c8aa68" }
< / code > < / pre >
< p > Grammar configuration takes these keys:< / p >
< div class = "table-wrapper" > < table > < thead > < tr > < th > Key< / th > < th > Description< / th > < / tr > < / thead > < tbody >
< tr > < td > < code > name< / code > < / td > < td > The name of the tree-sitter grammar< / td > < / tr >
< tr > < td > < code > source< / code > < / td > < td > The method of fetching the grammar - a table with a schema defined below< / td > < / tr >
< / tbody > < / table >
< / div >
< p > Where < code > source< / code > is a table with either these keys when using a grammar from a
git repository:< / p >
< div class = "table-wrapper" > < table > < thead > < tr > < th > Key< / th > < th > Description< / th > < / tr > < / thead > < tbody >
< tr > < td > < code > git< / code > < / td > < td > A git remote URL from which the grammar should be cloned< / td > < / tr >
< tr > < td > < code > rev< / code > < / td > < td > The revision (commit hash or tag) which should be fetched< / td > < / tr >
< 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 >
< / tbody > < / table >
< / div >
< h3 id = "choosing-grammars" > < a class = "header" href = "#choosing-grammars" > Choosing grammars< / a > < / h3 >
< p > You may use a top-level < code > use-grammars< / code > key to control which grammars are
fetched and built when using < code > hx --grammar fetch< / code > and < code > hx --grammar build< / code > .< / p >
< pre > < code class = "language-toml" > # Note: this key must come **before** the [[language]] and [[grammar]] sections
use-grammars = { only = [ " rust" , " c" , " cpp" ] }
# or
use-grammars = { except = [ " yaml" , " json" ] }
< / code > < / pre >
< p > When omitted, all grammars are fetched and built.< / p >
< / main >
< nav class = "nav-wrapper" aria-label = "Page navigation" >
<!-- Mobile navigation buttons -->
< a rel = "prev" href = "hooks.html" class = "mobile-nav-chapters previous" title = "Previous chapter" aria-label = "Previous chapter" aria-keyshortcuts = "Left" >
< i class = "fa fa-angle-left" > < / i >
< / a >
< a rel = "next" href = "guides/index.html" class = "mobile-nav-chapters next" title = "Next chapter" aria-label = "Next chapter" aria-keyshortcuts = "Right" >
< i class = "fa fa-angle-right" > < / i >
< / a >
< div style = "clear: both" > < / div >
< / nav >
< / div >
< / div >
< nav class = "nav-wide-wrapper" aria-label = "Page navigation" >
< a rel = "prev" href = "hooks.html" class = "nav-chapters previous" title = "Previous chapter" aria-label = "Previous chapter" aria-keyshortcuts = "Left" >
< i class = "fa fa-angle-left" > < / i >
< / a >
< a rel = "next" href = "guides/index.html" class = "nav-chapters next" title = "Next chapter" aria-label = "Next chapter" aria-keyshortcuts = "Right" >
< i class = "fa fa-angle-right" > < / i >
< / a >
< / nav >
< / div >
< script type = "text/javascript" >
window.playground_copyable = true;
< / script >
< script src = "elasticlunr.min.js" type = "text/javascript" charset = "utf-8" > < / script >
< script src = "mark.min.js" type = "text/javascript" charset = "utf-8" > < / script >
< script src = "searcher.js" type = "text/javascript" charset = "utf-8" > < / script >
< script src = "clipboard.min.js" type = "text/javascript" charset = "utf-8" > < / script >
< script src = "highlight.js" type = "text/javascript" charset = "utf-8" > < / script >
< script src = "book.js" type = "text/javascript" charset = "utf-8" > < / script >
<!-- Custom JS scripts -->
< / body >
< / html >
