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<p>Download pre-built binaries from the <ahref="https://github.com/helix-editor/helix/releases">GitHub Releases page</a>.
Add the <code>hx</code> binary to your system's <code>$PATH</code> to use it from the command line, and copy the <code>runtime</code> directory into the config directory (for example <code>~/.config/helix/runtime</code> on Linux/macOS).
The runtime location can be overriden via the HELIX_RUNTIME environment variable.</p>
<p>This will install Helix as both <code>/snap/bin/helix</code> and <code>/snap/bin/hx</code>, so make sure <code>/snap/bin</code> is in your <code>PATH</code>.</p>
<p>Install on Windows using <ahref="https://learn.microsoft.com/en-us/windows/package-manager/winget/">Winget</a>, <ahref="https://scoop.sh/">Scoop</a>, <ahref="https://chocolatey.org/">Chocolatey</a>
<p>Windows Package Manager winget command-line tool is by default available on Windows 11 and modern versions of Windows 10 as a part of the App Installer.
You can get <ahref="https://www.microsoft.com/p/app-installer/9nblggh4nns1#activetab=pivot:overviewtab">App Installer from the Microsoft Store</a>. If it's already installed, make sure it is updated with the latest version.</p>
<li>The <ahref="https://git-scm.com/">Git version control system</a></li>
<li>A C++14 compatible compiler to build the tree-sitter grammars, for example GCC or Clang</li>
</ul>
<p>If you are using the <code>musl-libc</code> standard library instead of <code>glibc</code> the following environment variable must be set during the build to ensure tree-sitter grammars can be loaded correctly:</p>
<p>If the above command fails to create a symbolic link because the file exists either move <code>~/.config/helix/runtime</code> to a new location or delete it, then run the symlink command above again.</p>
<p>Helix allows you to create your own named registers for storing text, for
example:</p>
<ul>
<li><code>"ay</code> - Yank the current selection to register <code>a</code>.</li>
<li><code>"op</code> - Paste the text in register <code>o</code> after the selection.</li>
</ul>
<p>If a register is selected before invoking a change or delete command, the selection will be stored in the register and the action will be carried out:</p>
<ul>
<li><code>"hc</code> - Store the selection in register <code>h</code> and then change it (delete and enter insert mode).</li>
<li><code>"md</code> - Store the selection in register <code>m</code> and delete it.</li>
<tr><td><code>_</code></td><td>No values are returned</td><td>All values are discarded</td></tr>
<tr><td><code>#</code></td><td>Selection indices (first selection is <code>1</code>, second is <code>2</code>, etc.)</td><td>This register is not writable</td></tr>
<tr><td><code>.</code></td><td>Contents of the current selections</td><td>This register is not writable</td></tr>
<tr><td><code>%</code></td><td>Name of the current file</td><td>This register is not writable</td></tr>
<tr><td><code>+</code></td><td>Reads from the system clipboard</td><td>Joins and yanks to the system clipboard</td></tr>
<tr><td><code>*</code></td><td>Reads from the primary clipboard</td><td>Joins and yanks to the primary clipboard</td></tr>
</tbody></table>
</div>
<p>When yanking multiple selections to the clipboard registers, the selections
are joined with newlines. Pasting from these registers will paste multiple
selections if the clipboard was last yanked to by the Helix session. Otherwise
the clipboard contents are pasted as one selection.</p>
<tr><td><code>ms<char></code> (after selecting text)</td><td>Add surround characters to selection</td></tr>
<tr><td><code>mr<char_to_replace><new_char></code></td><td>Replace the closest surround characters</td></tr>
<tr><td><code>md<char_to_delete></code></td><td>Delete the closest surround characters</td></tr>
</tbody></table>
</div>
<p>You can use counts to act on outer pairs.</p>
<p>Surround can also act on multiple selections. For example, to change every occurrence of <code>(use)</code> to <code>[use]</code>:</p>
<ol>
<li><code>%</code> to select the whole file</li>
<li><code>s</code> to split the selections on a search term</li>
<li>Input <code>use</code> and hit Enter</li>
<li><code>mr([</code> to replace the parentheses with square brackets</li>
</ol>
<p>Multiple characters are currently not supported, but planned for future release.</p>
<divstyle="break-before: page; page-break-before: always;"></div><h2id="selecting-and-manipulating-text-with-textobjects"><aclass="header"href="#selecting-and-manipulating-text-with-textobjects">Selecting and manipulating text with textobjects</a></h2>
<p>In Helix, textobjects are a way to select, manipulate and operate on a piece of
text in a structured way. They allow you to refer to blocks of text based on
their structure or purpose, such as a word, sentence, paragraph, or even a
<p>💡 <code>f</code>, <code>t</code>, etc. need a tree-sitter grammar active for the current
document and a special tree-sitter query file to work properly. <ahref="./lang-support.html">Only
some grammars</a> currently have the query file implemented.
Contributions are welcome!</p>
</blockquote>
<h2id="navigating-using-tree-sitter-textobjects"><aclass="header"href="#navigating-using-tree-sitter-textobjects">Navigating using tree-sitter textobjects</a></h2>
<p>Navigating between functions, classes, parameters, and other elements is
possible using tree-sitter and textobject queries. For
example to move to the next function use <code>]f</code>, to move to previous
<p>For the full reference see the <ahref="./keymap.html#unimpaired">unimpaired</a> section of the key bind
documentation.</p>
<blockquote>
<p>💡 This feature relies on tree-sitter textobjects
and requires the corresponding query file to work properly.</p>
</blockquote>
<divstyle="break-before: page; page-break-before: always;"></div><h2id="moving-the-selection-with-syntax-aware-motions"><aclass="header"href="#moving-the-selection-with-syntax-aware-motions">Moving the selection with syntax-aware motions</a></h2>
<p><code>Alt-p</code>, <code>Alt-o</code>, <code>Alt-i</code>, and <code>Alt-n</code> (or <code>Alt</code> and arrow keys) allow you to move the
selection according to its location in the syntax tree. For example, many languages have the
<p>💡 Mappings marked (<strong>LSP</strong>) require an active language server for the file.</p>
</blockquote>
<blockquote>
<p>💡 Mappings marked (<strong>TS</strong>) require a tree-sitter grammar for the file type.</p>
</blockquote>
<blockquote>
<p>⚠️ Some terminals' default key mappings conflict with Helix's. If any of the mappings described on this page do not work as expected, check your terminal's mappings to ensure they do not conflict. See the <ahref="https://github.com/helix-editor/helix/wiki/Terminal-Support">wiki</a> for known conflicts.</p>
<tr><td><code>G</code></td><td>Go to line number <code><n></code></td><td><code>goto_line</code></td></tr>
<tr><td><code>Alt-.</code></td><td>Repeat last motion (<code>f</code>, <code>t</code>, <code>m</code>, <code>[</code> or <code>]</code>)</td><td><code>repeat_last_motion</code></td></tr>
<tr><td><code>Home</code></td><td>Move to the start of the line</td><td><code>goto_line_start</code></td></tr>
<tr><td><code>End</code></td><td>Move to the end of the line</td><td><code>goto_line_end</code></td></tr>
<tr><td><code>Alt-d</code></td><td>Delete selection, without yanking</td><td><code>delete_selection_noyank</code></td></tr>
<tr><td><code>c</code></td><td>Change selection (delete and enter insert mode)</td><td><code>change_selection</code></td></tr>
<tr><td><code>Alt-c</code></td><td>Change selection (delete and enter insert mode, without yanking)</td><td><code>change_selection_noyank</code></td></tr>
<tr><td><code>Ctrl-a</code></td><td>Increment object (number) under cursor</td><td><code>increment</code></td></tr>
<tr><td><code>Ctrl-x</code></td><td>Decrement object (number) under cursor</td><td><code>decrement</code></td></tr>
<tr><td><code>Q</code></td><td>Start/stop macro recording to the selected register (experimental)</td><td><code>record_macro</code></td></tr>
<tr><td><code>q</code></td><td>Play back a recorded macro from the selected register (experimental)</td><td><code>replay_macro</code></td></tr>
<tr><td><code>|</code></td><td>Pipe each selection through shell command, replacing with output</td><td><code>shell_pipe</code></td></tr>
<tr><td><code>Alt-|</code></td><td>Pipe each selection into shell command, ignoring output</td><td><code>shell_pipe_to</code></td></tr>
<tr><td><code>!</code></td><td>Run shell command, inserting output before each selection</td><td><code>shell_insert_output</code></td></tr>
<tr><td><code>Alt-!</code></td><td>Run shell command, appending output after each selection</td><td><code>shell_append_output</code></td></tr>
<tr><td><code>$</code></td><td>Pipe each selection into shell command, keep selections where command returned 0</td><td><code>shell_keep_pipe</code></td></tr>
<tr><td><code>Alt-J</code></td><td>Join lines inside selection and select the inserted space</td><td><code>join_selections_space</code></td></tr>
<tr><td><code>K</code></td><td>Keep selections matching the regex</td><td><code>keep_selections</code></td></tr>
<tr><td><code>Alt-K</code></td><td>Remove selections matching the regex</td><td><code>remove_selections</code></td></tr>
<tr><td><code>Ctrl-c</code></td><td>Comment/uncomment the selections</td><td><code>toggle_comments</code></td></tr>
<tr><td><code>Alt-o</code>, <code>Alt-up</code></td><td>Expand selection to parent syntax node (<strong>TS</strong>)</td><td><code>expand_selection</code></td></tr>
<tr><td><code>Alt-i</code>, <code>Alt-down</code></td><td>Shrink syntax tree object selection (<strong>TS</strong>)</td><td><code>shrink_selection</code></td></tr>
<tr><td><code>Alt-p</code>, <code>Alt-left</code></td><td>Select previous sibling node in syntax tree (<strong>TS</strong>)</td><td><code>select_prev_sibling</code></td></tr>
<tr><td><code>Alt-n</code>, <code>Alt-right</code></td><td>Select next sibling node in syntax tree (<strong>TS</strong>)</td><td><code>select_next_sibling</code></td></tr>
<tr><td><code>g</code></td><td>Go to line number <code><n></code> else start of file</td><td><code>goto_file_start</code></td></tr>
<tr><td><code>e</code></td><td>Go to the end of the file</td><td><code>goto_last_line</code></td></tr>
<tr><td><code>f</code></td><td>Go to files in the selections</td><td><code>goto_file</code></td></tr>
<tr><td><code>h</code></td><td>Go to the start of the line</td><td><code>goto_line_start</code></td></tr>
<tr><td><code>l</code></td><td>Go to the end of the line</td><td><code>goto_line_end</code></td></tr>
<tr><td><code>s</code></td><td>Go to first non-whitespace character of the line</td><td><code>goto_first_nonwhitespace</code></td></tr>
<tr><td><code>t</code></td><td>Go to the top of the screen</td><td><code>goto_window_top</code></td></tr>
<tr><td><code>c</code></td><td>Go to the middle of the screen</td><td><code>goto_window_center</code></td></tr>
<tr><td><code>b</code></td><td>Go to the bottom of the screen</td><td><code>goto_window_bottom</code></td></tr>
<tr><td><code>d</code></td><td>Go to definition (<strong>LSP</strong>)</td><td><code>goto_definition</code></td></tr>
<tr><td><code>y</code></td><td>Go to type definition (<strong>LSP</strong>)</td><td><code>goto_type_definition</code></td></tr>
<tr><td><code>r</code></td><td>Go to references (<strong>LSP</strong>)</td><td><code>goto_reference</code></td></tr>
<tr><td><code>i</code></td><td>Go to implementation (<strong>LSP</strong>)</td><td><code>goto_implementation</code></td></tr>
<tr><td><code>a</code></td><td>Go to the last accessed/alternate file</td><td><code>goto_last_accessed_file</code></td></tr>
<tr><td><code>m</code></td><td>Go to the last modified/alternate file</td><td><code>goto_last_modified_file</code></td></tr>
<tr><td><code>n</code></td><td>Go to next buffer</td><td><code>goto_next_buffer</code></td></tr>
<tr><td><code>p</code></td><td>Go to previous buffer</td><td><code>goto_previous_buffer</code></td></tr>
<tr><td><code>.</code></td><td>Go to last modification in current file</td><td><code>goto_last_modification</code></td></tr>
<tr><td><code>j</code></td><td>Move down textual (instead of visual) line</td><td><code>move_line_down</code></td></tr>
<tr><td><code>k</code></td><td>Move up textual (instead of visual) line</td><td><code>move_line_up</code></td></tr>
<tr><td><code>w</code></td><td>Show labels at each word and select the word that belongs to the entered labels</td><td><code>goto_word</code></td></tr>
<p>Accessed by typing <code>m</code> in <ahref="keymap.html#normal-mode">normal mode</a>.</p>
<p>Please refer to the relevant sections for detailed explanations about <ahref="./surround.html">surround</a> and <ahref="./textobjects.html">textobjects</a>.</p>
<tr><td><code>s</code><code><char></code></td><td>Surround current selection with <code><char></code></td><td><code>surround_add</code></td></tr>
<tr><td><code>r</code><code><from><to></code></td><td>Replace surround character <code><from></code> with <code><to></code></td><td><code>surround_replace</code></td></tr>
<tr><td><code>d</code><code><char></code></td><td>Delete surround character <code><char></code></td><td><code>surround_delete</code></td></tr>
<tr><td><code>a</code><code><object></code></td><td>Select around textobject</td><td><code>select_textobject_around</code></td></tr>
<tr><td><code>k</code></td><td>Show documentation for item under cursor in a <ahref="keymap.html#popup">popup</a> (<strong>LSP</strong>)</td><td><code>hover</code></td></tr>
<tr><td><code>s</code></td><td>Open document symbol picker (<strong>LSP</strong>)</td><td><code>symbol_picker</code></td></tr>
<tr><td><code>S</code></td><td>Open workspace symbol picker (<strong>LSP</strong>)</td><td><code>workspace_symbol_picker</code></td></tr>
<tr><td><code>:buffer-close</code>, <code>:bc</code>, <code>:bclose</code></td><td>Close the current buffer.</td></tr>
<tr><td><code>:buffer-close!</code>, <code>:bc!</code>, <code>:bclose!</code></td><td>Close the current buffer forcefully, ignoring unsaved changes.</td></tr>
<tr><td><code>:buffer-close-others</code>, <code>:bco</code>, <code>:bcloseother</code></td><td>Close all buffers but the currently focused one.</td></tr>
<tr><td><code>:buffer-close-others!</code>, <code>:bco!</code>, <code>:bcloseother!</code></td><td>Force close all buffers but the currently focused one.</td></tr>
<tr><td><code>:buffer-close-all</code>, <code>:bca</code>, <code>:bcloseall</code></td><td>Close all buffers without quitting.</td></tr>
<tr><td><code>:buffer-close-all!</code>, <code>:bca!</code>, <code>:bcloseall!</code></td><td>Force close all buffers ignoring unsaved changes without quitting.</td></tr>
<tr><td><code>:buffer-next</code>, <code>:bn</code>, <code>:bnext</code></td><td>Goto next buffer.</td></tr>
<tr><td><code>:write</code>, <code>:w</code></td><td>Write changes to disk. Accepts an optional path (:write some/path.txt)</td></tr>
<tr><td><code>:write!</code>, <code>:w!</code></td><td>Force write changes to disk creating necessary subdirectories. Accepts an optional path (:write! some/path.txt)</td></tr>
<tr><td><code>:write-buffer-close</code>, <code>:wbc</code></td><td>Write changes to disk and closes the buffer. Accepts an optional path (:write-buffer-close some/path.txt)</td></tr>
<tr><td><code>:write-buffer-close!</code>, <code>:wbc!</code></td><td>Force write changes to disk creating necessary subdirectories and closes the buffer. Accepts an optional path (:write-buffer-close! some/path.txt)</td></tr>
<tr><td><code>:new</code>, <code>:n</code></td><td>Create a new scratch buffer.</td></tr>
<tr><td><code>:format</code>, <code>:fmt</code></td><td>Format the file using the LSP formatter.</td></tr>
<tr><td><code>:indent-style</code></td><td>Set the indentation style for editing. ('t' for tabs or 1-16 for number of spaces.)</td></tr>
<tr><td><code>:line-ending</code></td><td>Set the document's default line ending. Options: crlf, lf.</td></tr>
<tr><td><code>:earlier</code>, <code>:ear</code></td><td>Jump back to an earlier point in edit history. Accepts a number of steps or a time span.</td></tr>
<tr><td><code>:later</code>, <code>:lat</code></td><td>Jump to a later point in edit history. Accepts a number of steps or a time span.</td></tr>
<tr><td><code>:write-quit</code>, <code>:wq</code>, <code>:x</code></td><td>Write changes to disk and close the current view. Accepts an optional path (:wq some/path.txt)</td></tr>
<tr><td><code>:write-quit!</code>, <code>:wq!</code>, <code>:x!</code></td><td>Write changes to disk and close the current view forcefully. Accepts an optional path (:wq! some/path.txt)</td></tr>
<tr><td><code>:write-all</code>, <code>:wa</code></td><td>Write changes from all buffers to disk.</td></tr>
<tr><td><code>:write-all!</code>, <code>:wa!</code></td><td>Forcefully write changes from all buffers to disk creating necessary subdirectories.</td></tr>
<tr><td><code>:write-quit-all</code>, <code>:wqa</code>, <code>:xa</code></td><td>Write changes from all buffers to disk and close all views.</td></tr>
<tr><td><code>:write-quit-all!</code>, <code>:wqa!</code>, <code>:xa!</code></td><td>Write changes from all buffers to disk and close all views forcefully (ignoring unsaved changes).</td></tr>
<tr><td><code>:quit-all</code>, <code>:qa</code></td><td>Close all views.</td></tr>
<tr><td><code>:quit-all!</code>, <code>:qa!</code></td><td>Force close all views ignoring unsaved changes.</td></tr>
<tr><td><code>:cquit</code>, <code>:cq</code></td><td>Quit with exit code (default 1). Accepts an optional integer exit code (:cq 2).</td></tr>
<tr><td><code>:cquit!</code>, <code>:cq!</code></td><td>Force quit with exit code (default 1) ignoring unsaved changes. Accepts an optional integer exit code (:cq! 2).</td></tr>
<tr><td><code>:theme</code></td><td>Change the editor theme (show current theme if no name specified).</td></tr>
<tr><td><code>:yank-join</code></td><td>Yank joined selections. A separator can be provided as first argument. Default value is newline.</td></tr>
<tr><td><code>:clipboard-yank</code></td><td>Yank main selection into system clipboard.</td></tr>
<tr><td><code>:clipboard-yank-join</code></td><td>Yank joined selections into system clipboard. A separator can be provided as first argument. Default value is newline.</td></tr>
<tr><td><code>:primary-clipboard-yank</code></td><td>Yank main selection into system primary clipboard.</td></tr>
<tr><td><code>:primary-clipboard-yank-join</code></td><td>Yank joined selections into system primary clipboard. A separator can be provided as first argument. Default value is newline.</td></tr>
<tr><td><code>:clipboard-paste-after</code></td><td>Paste system clipboard after selections.</td></tr>
<tr><td><code>:clipboard-paste-before</code></td><td>Paste system clipboard before selections.</td></tr>
<tr><td><code>:clipboard-paste-replace</code></td><td>Replace selections with content of system clipboard.</td></tr>
<tr><td><code>:primary-clipboard-paste-after</code></td><td>Paste primary clipboard after selections.</td></tr>
<tr><td><code>:primary-clipboard-paste-before</code></td><td>Paste primary clipboard before selections.</td></tr>
<tr><td><code>:primary-clipboard-paste-replace</code></td><td>Replace selections with content of system primary clipboard.</td></tr>
<tr><td><code>:show-clipboard-provider</code></td><td>Show clipboard provider name in status bar.</td></tr>
<tr><td><code>:change-current-directory</code>, <code>:cd</code></td><td>Change the current working directory.</td></tr>
<tr><td><code>:show-directory</code>, <code>:pwd</code></td><td>Show the current working directory.</td></tr>
<tr><td><code>:encoding</code></td><td>Set encoding. Based on <code>https://encoding.spec.whatwg.org</code>.</td></tr>
<tr><td><code>:character-info</code>, <code>:char</code></td><td>Get info about the character under the primary cursor.</td></tr>
<tr><td><code>:reload</code>, <code>:rl</code></td><td>Discard changes and reload from the source file.</td></tr>
<tr><td><code>:reload-all</code>, <code>:rla</code></td><td>Discard changes and reload all documents from the source files.</td></tr>
<tr><td><code>:update</code>, <code>:u</code></td><td>Write changes only if the file has been modified.</td></tr>
<tr><td><code>:lsp-restart</code></td><td>Restarts the language servers used by the current doc</td></tr>
<tr><td><code>:lsp-stop</code></td><td>Stops the language servers that are used by the current doc</td></tr>
<tr><td><code>:tree-sitter-scopes</code></td><td>Display tree sitter scopes, primarily for theming and development.</td></tr>
<tr><td><code>:tree-sitter-highlight-name</code></td><td>Display name of tree-sitter highlight scope under the cursor.</td></tr>
<tr><td><code>:debug-start</code>, <code>:dbg</code></td><td>Start a debug session from a given template with given parameters.</td></tr>
<tr><td><code>:debug-remote</code>, <code>:dbg-tcp</code></td><td>Connect to a debug adapter by TCP address and start a debugging session from a given template with given parameters.</td></tr>
<tr><td><code>:debug-eval</code></td><td>Evaluate expression in current debug context.</td></tr>
<tr><td><code>:vsplit</code>, <code>:vs</code></td><td>Open the file in a vertical split.</td></tr>
<tr><td><code>:vsplit-new</code>, <code>:vnew</code></td><td>Open a scratch buffer in a vertical split.</td></tr>
<tr><td><code>:hsplit</code>, <code>:hs</code>, <code>:sp</code></td><td>Open the file in a horizontal split.</td></tr>
<tr><td><code>:hsplit-new</code>, <code>:hnew</code></td><td>Open a scratch buffer in a horizontal split.</td></tr>
<tr><td><code>:tutor</code></td><td>Open the tutorial.</td></tr>
<tr><td><code>:goto</code>, <code>:g</code></td><td>Goto line number.</td></tr>
<tr><td><code>:set-language</code>, <code>:lang</code></td><td>Set the language of current buffer (show current language if no value specified).</td></tr>
<tr><td><code>:set-option</code>, <code>:set</code></td><td>Set a config option at runtime.<br>For example to disable smart case search, use <code>:set search.smart-case false</code>.</td></tr>
<tr><td><code>:toggle-option</code>, <code>:toggle</code></td><td>Toggle a boolean config option at runtime.<br>For example to toggle smart case search, use <code>:toggle search.smart-case</code>.</td></tr>
<tr><td><code>:get-option</code>, <code>:get</code></td><td>Get the current value of a config option.</td></tr>
<tr><td><code>:sort</code></td><td>Sort ranges in selection.</td></tr>
<tr><td><code>:rsort</code></td><td>Sort ranges in selection in reverse order.</td></tr>
<tr><td><code>:reflow</code></td><td>Hard-wrap the current selection of lines to a given width.</td></tr>
<tr><td><code>:tree-sitter-subtree</code>, <code>:ts-subtree</code></td><td>Display tree sitter subtree under cursor, primarily for debugging queries.</td></tr>
<tr><td><code>:config-reload</code></td><td>Refresh user config.</td></tr>
<tr><td><code>:config-open</code></td><td>Open the user config.toml file.</td></tr>
<tr><td><code>:config-open-workspace</code></td><td>Open the workspace config.toml file.</td></tr>
<tr><td><code>:log-open</code></td><td>Open the helix log file.</td></tr>
<tr><td><code>:insert-output</code></td><td>Run shell command, inserting output before each selection.</td></tr>
<tr><td><code>:append-output</code></td><td>Run shell command, appending output after each selection.</td></tr>
<tr><td><code>:pipe</code></td><td>Pipe each selection to the shell command.</td></tr>
<tr><td><code>:pipe-to</code></td><td>Pipe each selection to the shell command, ignoring output.</td></tr>
<tr><td><code>:run-shell-command</code>, <code>:sh</code></td><td>Run a shell command</td></tr>
<tr><td><code>:reset-diff-change</code>, <code>:diffget</code>, <code>:diffg</code></td><td>Reset the diff change at the cursor position.</td></tr>
<tr><td><code>:clear-register</code></td><td>Clear given register. If no argument is provided, clear all registers.</td></tr>
<tr><td><code>:redraw</code></td><td>Clear and re-render the whole UI</td></tr>
</div><divstyle="break-before: page; page-break-before: always;"></div><h1id="migrating-from-vim"><aclass="header"href="#migrating-from-vim">Migrating from Vim</a></h1>
<p>Helix's editing model is strongly inspired from Vim and Kakoune, and a notable
difference from Vim (and the most striking similarity to Kakoune) is that Helix
follows the <code>selection → action</code> model. This means that whatever you are
going to act on (a word, a paragraph, a line, etc.) is selected first and the
action itself (delete, change, yank, etc.) comes second. A cursor is simply a
single width selection.</p>
<p>See also Kakoune's <ahref="https://github.com/mawww/kakoune/wiki/Migrating-from-Vim">Migrating from Vim</a> and Helix's <ahref="https://github.com/helix-editor/helix/wiki/Migrating-from-Vim">Migrating from Vim</a>.</p>
<tr><td><code>scroll-lines</code></td><td>Number of lines to scroll per scroll wheel step</td><td><code>3</code></td></tr>
<tr><td><code>shell</code></td><td>Shell to use when running external commands</td><td>Unix: <code>["sh", "-c"]</code><br/>Windows: <code>["cmd", "/C"]</code></td></tr>
<tr><td><code>line-number</code></td><td>Line number display: <code>absolute</code> simply shows each line's number, while <code>relative</code> shows the distance from the current line. When unfocused or in insert mode, <code>relative</code> will still show absolute line numbers</td><td><code>absolute</code></td></tr>
<tr><td><code>cursorline</code></td><td>Highlight all lines with a cursor</td><td><code>false</code></td></tr>
<tr><td><code>cursorcolumn</code></td><td>Highlight all columns with a cursor</td><td><code>false</code></td></tr>
<tr><td><code>gutters</code></td><td>Gutters to display: Available are <code>diagnostics</code> and <code>diff</code> and <code>line-numbers</code> and <code>spacer</code>, note that <code>diagnostics</code> also includes other features like breakpoints, 1-width padding will be inserted if gutters is non-empty</td><td><code>["diagnostics", "spacer", "line-numbers", "spacer", "diff"]</code></td></tr>
<tr><td><code>auto-completion</code></td><td>Enable automatic pop up of auto-completion</td><td><code>true</code></td></tr>
<tr><td><code>auto-format</code></td><td>Enable automatic formatting on save</td><td><code>true</code></td></tr>
<tr><td><code>idle-timeout</code></td><td>Time in milliseconds since last keypress before idle timers trigger.</td><td><code>250</code></td></tr>
<tr><td><code>completion-timeout</code></td><td>Time in milliseconds after typing a word character before completions are shown, set to 5 for instant.</td><td><code>250</code></td></tr>
<tr><td><code>preview-completion-insert</code></td><td>Whether to apply completion item instantly when selected</td><td><code>true</code></td></tr>
<tr><td><code>completion-trigger-len</code></td><td>The min-length of word under cursor to trigger autocompletion</td><td><code>2</code></td></tr>
<tr><td><code>completion-replace</code></td><td>Set to <code>true</code> to make completions always replace the entire word and not just the part before the cursor</td><td><code>false</code></td></tr>
<tr><td><code>auto-info</code></td><td>Whether to display info boxes</td><td><code>true</code></td></tr>
<tr><td><code>true-color</code></td><td>Set to <code>true</code> to override automatic detection of terminal truecolor support in the event of a false negative</td><td><code>false</code></td></tr>
<tr><td><code>undercurl</code></td><td>Set to <code>true</code> to override automatic detection of terminal undercurl support in the event of a false negative</td><td><code>false</code></td></tr>
<tr><td><code>rulers</code></td><td>List of column positions at which to display the rulers. Can be overridden by language specific <code>rulers</code> in <code>languages.toml</code> file</td><td><code>[]</code></td></tr>
<tr><td><code>bufferline</code></td><td>Renders a line at the top of the editor displaying open buffers. Can be <code>always</code>, <code>never</code> or <code>multiple</code> (only shown if more than one buffer is in use)</td><td><code>never</code></td></tr>
<tr><td><code>color-modes</code></td><td>Whether to color the mode indicator with different colors depending on the mode itself</td><td><code>false</code></td></tr>
<tr><td><code>text-width</code></td><td>Maximum line length. Used for the <code>:reflow</code> command and soft-wrapping if <code>soft-wrap.wrap-at-text-width</code> is set</td><td><code>80</code></td></tr>
<tr><td><code>workspace-lsp-roots</code></td><td>Directories relative to the workspace root that are treated as LSP roots. Should only be set in <code>.helix/config.toml</code></td><td><code>[]</code></td></tr>
<tr><td><code>default-line-ending</code></td><td>The line ending to use for new documents. Can be <code>native</code>, <code>lf</code>, <code>crlf</code>, <code>ff</code>, <code>cr</code> or <code>nel</code>. <code>native</code> uses the platform's native line ending (<code>crlf</code> on Windows, otherwise <code>lf</code>).</td><td><code>native</code></td></tr>
<tr><td><code>insert-final-newline</code></td><td>Whether to automatically insert a trailing line-ending on write if missing</td><td><code>true</code></td></tr>
<tr><td><code>popup-border</code></td><td>Draw border around <code>popup</code>, <code>menu</code>, <code>all</code>, or <code>none</code></td><td><code>none</code></td></tr>
<tr><td><code>indent-heuristic</code></td><td>How the indentation for a newly inserted line is computed: <code>simple</code> just copies the indentation level from the previous line, <code>tree-sitter</code> computes the indentation based on the syntax tree and <code>hybrid</code> combines both approaches. If the chosen heuristic is not available, a different one will be used as a fallback (the fallback order being <code>hybrid</code> -><code>tree-sitter</code> -><code>simple</code>).</td><td><code>hybrid</code></td></tr>
<tr><td><code>jump-label-alphabet</code></td><td>The characters that are used to generate two character jump labels. Characters at the start of the alphabet are used first.</td><td><code>"abcdefghijklmnopqrstuvwxyz"</code></td></tr>
<tr><td><code>end-of-line-diagnostics</code></td><td>Minimum severity of diagnostics to render at the end of the line. Set to <code>disable</code> to disable entirely. Refer to the setting about <code>inline-diagnostics</code> for more details</td><td>"disable"</td></tr>
<tr><td><code>left</code></td><td>A list of elements aligned to the left of the statusline</td><td><code>["mode", "spinner", "file-name", "read-only-indicator", "file-modification-indicator"]</code></td></tr>
<tr><td><code>center</code></td><td>A list of elements aligned to the middle of the statusline</td><td><code>[]</code></td></tr>
<tr><td><code>right</code></td><td>A list of elements aligned to the right of the statusline</td><td><code>["diagnostics", "selections", "register", "position", "file-encoding"]</code></td></tr>
<tr><td><code>separator</code></td><td>The character used to separate elements in the statusline</td><td><code>"│"</code></td></tr>
<tr><td><code>mode.normal</code></td><td>The text shown in the <code>mode</code> element for normal mode</td><td><code>"NOR"</code></td></tr>
<tr><td><code>mode.insert</code></td><td>The text shown in the <code>mode</code> element for insert mode</td><td><code>"INS"</code></td></tr>
<tr><td><code>mode.select</code></td><td>The text shown in the <code>mode</code> element for select mode</td><td><code>"SEL"</code></td></tr>
</tbody></table>
</div>
<p>The following statusline elements can be configured:</p>
<tr><td><code>file-name</code></td><td>The path/name of the opened file</td></tr>
<tr><td><code>file-absolute-path</code></td><td>The absolute path/name of the opened file</td></tr>
<tr><td><code>file-base-name</code></td><td>The basename of the opened file</td></tr>
<tr><td><code>file-modification-indicator</code></td><td>The indicator to show whether the file is modified (a <code>[+]</code> appears when there are unsaved changes)</td></tr>
<tr><td><code>file-encoding</code></td><td>The encoding of the opened file if it differs from UTF-8</td></tr>
<tr><td><code>file-line-ending</code></td><td>The file line endings (CRLF or LF)</td></tr>
<tr><td><code>read-only-indicator</code></td><td>An indicator that shows <code>[readonly]</code> when a file cannot be written</td></tr>
<tr><td><code>total-line-numbers</code></td><td>The total line numbers of the opened file</td></tr>
<tr><td><code>file-type</code></td><td>The type of the opened file</td></tr>
<tr><td><code>diagnostics</code></td><td>The number of warnings and/or errors</td></tr>
<tr><td><code>workspace-diagnostics</code></td><td>The number of warnings and/or errors on workspace</td></tr>
<tr><td><code>selections</code></td><td>The number of active selections</td></tr>
<tr><td><code>primary-selection-length</code></td><td>The number of characters currently in primary selection</td></tr>
<tr><td><code>enable</code></td><td>Enables LSP integration. Setting to false will completely disable language servers regardless of language settings.</td><td><code>true</code></td></tr>
<tr><td><code>display-signature-help-docs</code></td><td>Display docs under signature help popup</td><td><code>true</code></td></tr>
<tr><td><code>snippets</code></td><td>Enables snippet completions. Requires a server restart (<code>:lsp-restart</code>) to take effect after <code>:config-reload</code>/<code>:set</code>.</td><td><code>true</code></td></tr>
<tr><td><code>goto-reference-include-declaration</code></td><td>Include declaration in the goto references popup.</td><td><code>true</code></td></tr>
<p>You may also have to activate them in the LSP config for them to appear, not just in Helix. Inlay hints in Helix are still being improved on and may be a little bit laggy/janky under some circumstances. Please report any bugs you see so we can fix them!</p>
<tr><td><code>git-global</code></td><td>Enables reading global <code>.gitignore</code>, whose path is specified in git's config: <code>core.excludesfile</code> option</td><td><code>true</code></td></tr>
<tr><td><code>max-depth</code></td><td>Set with an integer value for maximum depth to recurse</td><td>Unset by default</td></tr>
</tbody></table>
</div>
<p>Ignore files can be placed locally as <code>.ignore</code> or put in your home directory as <code>~/.ignore</code>. They support the usual ignore and negative ignore (unignore) rules used in <code>.gitignore</code> files.</p>
<p>Additionally, you can use Helix-specific ignore files by creating a local <code>.helix/ignore</code> file in the current workspace or a global <code>ignore</code> file located in your Helix config directory:</p>
<ul>
<li>Linux and Mac: <code>~/.config/helix/ignore</code></li>
<tr><td><code>focus-lost</code></td><td>Enable automatic saving on the focus moving away from Helix. Requires <ahref="https://github.com/helix-editor/helix/wiki/Terminal-Support">focus event support</a> from your terminal</td><td><code>false</code></td></tr>
<tr><td><code>after-delay.enable</code></td><td>Enable automatic saving after <code>auto-save.after-delay.timeout</code> milliseconds have passed since last edit.</td><td><code>false</code></td></tr>
<tr><td><code>after-delay.timeout</code></td><td>Time in milliseconds since last edit before auto save timer triggers.</td><td><code>3000</code></td></tr>
<tr><td><code>render</code></td><td>Whether to render whitespace. May either be <code>all</code> or <code>none</code>, or a table with sub-keys <code>space</code>, <code>nbsp</code>, <code>nnbsp</code>, <code>tab</code>, and <code>newline</code></td><td><code>none</code></td></tr>
<tr><td><code>characters</code></td><td>Literal characters to use when rendering whitespace. Sub-keys may be any of <code>tab</code>, <code>space</code>, <code>nbsp</code>, <code>nnbsp</code>, <code>newline</code> or <code>tabpad</code></td><td>See example below</td></tr>
<tr><td><code>layout</code></td><td>A vector of gutters to display</td><td><code>["diagnostics", "spacer", "line-numbers", "spacer", "diff"]</code></td></tr>
<p>The <code>diff</code> gutter option displays colored bars indicating whether a <code>git</code> diff represents that a line was added, removed or changed.
These colors are controlled by the theme attributes <code>diff.plus</code>, <code>diff.minus</code> and <code>diff.delta</code>.</p>
<p>Other diff providers will eventually be supported by a future plugin system.</p>
<p>There are currently no options for this section.</p>
<tr><td><code>enable</code></td><td>Whether soft wrapping is enabled.</td><td><code>false</code></td></tr>
<tr><td><code>max-wrap</code></td><td>Maximum free space left at the end of the line.</td><td><code>20</code></td></tr>
<tr><td><code>max-indent-retain</code></td><td>Maximum indentation to carry over when soft wrapping a line.</td><td><code>40</code></td></tr>
<tr><td><code>wrap-indicator</code></td><td>Text inserted before soft wrapped lines, highlighted with <code>ui.virtual.wrap</code></td><td><code>↪ </code></td></tr>
<tr><td><code>wrap-at-text-width</code></td><td>Soft wrap at <code>text-width</code> instead of using the full viewport size.</td><td><code>false</code></td></tr>
<tr><td><code>enable</code></td><td>If set to true, then when the cursor is in a position with non-whitespace to its left, instead of inserting a tab, it will run <code>move_parent_node_end</code>. If there is only whitespace to the left, then it inserts a tab as normal. With the default bindings, to explicitly insert a tab character, press Shift-tab.</td><td><code>true</code></td></tr>
<tr><td><code>supersede-menu</code></td><td>Normally, when a menu is on screen, such as when auto complete is triggered, the tab key is bound to cycling through the items. This means when menus are on screen, one cannot use the tab key to trigger the <code>smart-tab</code> command. If this option is set to true, the <code>smart-tab</code> command always takes precedence, which means one cannot use the tab key to cycle through menu items. One of the other bindings must be used instead, such as arrow keys or <code>C-n</code>/<code>C-p</code>.</td><td><code>false</code></td></tr>
</tbody></table>
</div>
<p>Due to lack of support for S-tab in some terminals, the default keybindings don't fully embrace smart-tab editing experience. If you enjoy smart-tab navigation and a terminal that supports the <ahref="https://github.com/helix-editor/helix/wiki/Terminal-Support#enhanced-keyboard-protocol">Enhanced Keyboard protocol</a>, consider setting extra keybindings:</p>
<tr><td><code>cursor-line</code></td><td>The minimum severity that a diagnostic must have to be shown inline on the line that contains the primary cursor. Set to <code>disable</code> to not show any diagnostics inline. This option does not have any effect when in insert-mode and will only take effect 350ms after moving the cursor to a different line.</td><td><code>"disable"</code></td></tr>
<tr><td><code>other-lines</code></td><td>The minimum severity that a diagnostic must have to be shown inline on a line that does not contain the cursor-line. Set to <code>disable</code> to not show any diagnostics inline.</td><td><code>"disable"</code></td></tr>
<tr><td><code>prefix-len</code></td><td>How many horizontal bars <code>─</code> are rendered before the diagnostic text.</td><td><code>1</code></td></tr>
<tr><td><code>max-wrap</code></td><td>Equivalent of the <code>editor.soft-wrap.max-wrap</code> option for diagnostics.</td><td><code>20</code></td></tr>
<tr><td><code>max-diagnostics</code></td><td>Maximum number of diagnostics to render inline for a given line</td><td><code>10</code></td></tr>
</tbody></table>
</div>
<p>The (first) diagnostic with the highest severity that is not shown inline is rendered at the end of the line (as long as its severity is higher than the <code>end-of-line-diagnostics</code> config option):</p>
<pre><code>fn main() {
let baz = 1;
let foo = bar; a local variable with a similar name exists: baz
└─ no such value in this scope
}
</code></pre>
<p>The new diagnostic rendering is not yet enabled by default. As soon as end of line or inline diagnostics are enabled the old diagnostics rendering is automatically disabled. The recommended default setting are:</p>
<pre><code>end-of-line-diagnostics = "hint"
[editor.inline-diagnostics]
cursor-line = "warning" # show warnings and errors on the cursorline inline
<p>To use a theme add <code>theme = "<name>"</code> to the top of your <ahref="./configuration.html"><code>config.toml</code></a> file, or select it during runtime using <code>:theme <name></code>.</p>
<h2id="creating-a-theme"><aclass="header"href="#creating-a-theme">Creating a theme</a></h2>
<p>Create a file with the name of your theme as the file name (i.e <code>mytheme.toml</code>) and place it in your <code>themes</code> directory (i.e <code>~/.config/helix/themes</code> or <code>%AppData%\helix\themes</code> on Windows). The directory might have to be created beforehand.</p>
<blockquote>
<p>💡 The names "default" and "base16_default" are reserved for built-in themes
and cannot be overridden by user-defined themes.</p>
<p>Where <code>key</code> represents what you want to style, <code>fg</code> specifies the foreground color, <code>bg</code> the background color, <code>underline</code> the underline <code>style</code>/<code>color</code>, and <code>modifiers</code> is a list of style modifiers. <code>bg</code>, <code>underline</code> and <code>modifiers</code> can be omitted to defer to the defaults.</p>
<p>To specify only the foreground color:</p>
<pre><codeclass="language-toml">key = "#ffffff"
</code></pre>
<p>If the key contains a dot <code>'.'</code>, it must be quoted to prevent it being parsed as a <ahref="https://toml.io/en/v1.0.0#keys">dotted key</a>.</p>
<p>These keys match <ahref="https://tree-sitter.github.io/tree-sitter/syntax-highlighting#theme">tree-sitter scopes</a>.</p>
<p>When determining styling for a highlight, the longest matching theme key will be used. For example, if the highlight is <code>function.builtin.static</code>, the key <code>function.builtin</code> will be used instead of <code>function</code>.</p>
<p>We use a similar set of scopes as
<ahref="https://www.sublimetext.com/docs/scope_naming.html">Sublime Text</a>. See also
<tr><td><code>ui.statusline.normal</code></td><td>Statusline mode during normal mode (<ahref="./configuration.html#editor-section">only if <code>editor.color-modes</code> is enabled</a>)</td></tr>
<tr><td><code>ui.statusline.insert</code></td><td>Statusline mode during insert mode (<ahref="./configuration.html#editor-section">only if <code>editor.color-modes</code> is enabled</a>)</td></tr>
<tr><td><code>ui.statusline.select</code></td><td>Statusline mode during select mode (<ahref="./configuration.html#editor-section">only if <code>editor.color-modes</code> is enabled</a>)</td></tr>
<tr><td><code>ui.statusline.separator</code></td><td>Separator character in statusline</td></tr>
<tr><td><code>ui.bufferline</code></td><td>Style for the buffer line</td></tr>
<tr><td><code>ui.bufferline.active</code></td><td>Style for the active buffer in buffer line</td></tr>
<tr><td><code>ui.bufferline.background</code></td><td>Style for bufferline background</td></tr>
<tr><td><code>ui.popup</code></td><td>Documentation popups (e.g. Space + k)</td></tr>
<tr><td><code>ui.popup.info</code></td><td>Prompt for multiple key options</td></tr>
<tr><td><code>ui.help</code></td><td>Description box for commands</td></tr>
<tr><td><code>ui.text</code></td><td>Default text style, command prompts, popup text, etc.</td></tr>
<tr><td><code>ui.text.focus</code></td><td>The currently selected line in the picker</td></tr>
<tr><td><code>ui.text.inactive</code></td><td>Same as <code>ui.text</code> but when the text is inactive (e.g. suggestions)</td></tr>
<tr><td><code>ui.text.info</code></td><td>The key: command text in <code>ui.popup.info</code> boxes</td></tr>
<tr><td><code>ui.virtual.ruler</code></td><td>Ruler columns (see the <ahref="./configuration.html#editor-section"><code>editor.rulers</code> config</a>)</td></tr>
<tr><td><code>ui.virtual.inlay-hint</code></td><td>Default style for inlay hints of all kinds</td></tr>
<tr><td><code>ui.virtual.inlay-hint.parameter</code></td><td>Style for inlay hints of kind <code>parameter</code> (LSPs are not required to set a kind)</td></tr>
<tr><td><code>ui.virtual.inlay-hint.type</code></td><td>Style for inlay hints of kind <code>type</code> (LSPs are not required to set a kind)</td></tr>
<tr><td><code>ui.virtual.wrap</code></td><td>Soft-wrap indicator (see the <ahref="./configuration.html#editor-section"><code>editor.soft-wrap</code> config</a>)</td></tr>
<tr><td><code>ui.virtual.jump-label</code></td><td>Style for virtual jump labels</td></tr>
<tr><td><code>ui.menu</code></td><td>Code and command completion menus</td></tr>
<tr><td><code>ui.highlight</code></td><td>Highlighted lines in the picker preview</td></tr>
<tr><td><code>ui.cursorline.primary</code></td><td>The line of the primary cursor (<ahref="./configuration.html#editor-section">if cursorline is enabled</a>)</td></tr>
<tr><td><code>ui.cursorline.secondary</code></td><td>The lines of any other cursors (<ahref="./configuration.html#editor-section">if cursorline is enabled</a>)</td></tr>
<tr><td><code>ui.cursorcolumn.primary</code></td><td>The column of the primary cursor (<ahref="./configuration.html#editor-section">if cursorcolumn is enabled</a>)</td></tr>
<tr><td><code>ui.cursorcolumn.secondary</code></td><td>The columns of any other cursors (<ahref="./configuration.html#editor-section">if cursorcolumn is enabled</a>)</td></tr>
<p>Keys can be disabled by binding them to the <code>no_op</code> command.</p>
<p>A list of commands is available in the <ahref="https://docs.helix-editor.com/keymap.html">Keymap</a> documentation
and in the source code at <ahref="https://github.com/helix-editor/helix/blob/master/helix-term/src/commands.rs"><code>helix-term/src/commands.rs</code></a> at the invocation of <code>static_commands!</code> macro and the <code>TypableCommandList</code>.</p>
<tr><td><code>name</code></td><td>The name of the language</td></tr>
<tr><td><code>language-id</code></td><td>The language-id for language servers, checkout the table at <ahref="https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocumentItem">TextDocumentItem</a> for the right id</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 <ahref="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>. See the file-type detection section below.</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-tokens</code></td><td>The tokens to use as a comment token, either a single token <code>"//"</code> or an array <code>["//", "///", "//!"]</code> (the first token will be used for commenting). Also configurable as <code>comment-token</code> for backwards compatibility</td></tr>
<tr><td><code>block-comment-tokens</code></td><td>The start and end tokens for a multiline comment either an array or single table of <code>{ start = "/*", end = "*/"}</code>. The first set of tokens will be used for commenting, any pairs in the array can be uncommented</td></tr>
<tr><td><code>indent</code></td><td>The indent to use. Has sub keys <code>unit</code> (the text inserted into the document when indenting; usually set to N spaces or <code>"\t"</code> for tabs) and <code>tab-width</code> (the number of spaces rendered for a tab)</td></tr>
<tr><td><code>language-servers</code></td><td>The Language Servers used for this language. See below for more information in the section <ahref="languages.html#configuring-language-servers-for-a-language">Configuring Language Servers for a language</a></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>
<tr><td><code>formatter</code></td><td>The formatter for the language, it will take precedence over the lsp when defined. The formatter must be able to take the original file as input from stdin and write the formatted file to stdout</td></tr>
<tr><td><code>text-width</code></td><td>Maximum line length. Used for the <code>:reflow</code> command and soft-wrapping if <code>soft-wrap.wrap-at-text-width</code> is set, defaults to <code>editor.text-width</code></td></tr>
<tr><td><code>workspace-lsp-roots</code></td><td>Directories relative to the workspace root that are treated as LSP roots. Should only be set in <code>.helix/config.toml</code>. Overwrites the setting of the same name in <code>config.toml</code> if set.</td></tr>
<tr><td><code>persistent-diagnostic-sources</code></td><td>An array of LSP diagnostic sources assumed unchanged when the language server resends the same set of diagnostics. Helix can track the position for these diagnostics internally instead. Useful for diagnostics that are recomputed on save.</td></tr>
</tbody></table>
</div>
<h3id="file-type-detection-and-the-file-types-key"><aclass="header"href="#file-type-detection-and-the-file-types-key">File-type detection and the <code>file-types</code> key</a></h3>
<p>Helix determines which language configuration to use based on the <code>file-types</code> key
from the above section. <code>file-types</code> is a list of strings or tables, for
<p>When determining a language configuration to use, Helix searches the file-types
with the following priorities:</p>
<ol>
<li>Glob: values in <code>glob</code> tables are checked against the full path of the given
file. Globs are standard Unix-style path globs (e.g. the kind you use in Shell)
and can be used to match paths for a specific prefix, suffix, directory, etc.
In the above example, the <code>{ glob = "Makefile" }</code> config would match files
with the name <code>Makefile</code>, the <code>{ glob = ".git/config" }</code> config would match
<code>config</code> files in <code>.git</code> directories, and the <code>{ glob = ".github/workflows/*.yaml" }</code>
config would match any <code>yaml</code> files in <code>.github/workflow</code> directories. Note
that globs should always use the Unix path separator <code>/</code> even on Windows systems;
the matcher will automatically take the machine-specific separators into account.
If the glob isn't an absolute path or doesn't already start with a glob prefix,
<code>*/</code> will automatically be added to ensure it matches for any subdirectory.</li>
<li>Extension: if there are no glob matches, any <code>file-types</code> string that matches
the file extension of a given file wins. In the example above, the <code>"toml"</code>
config matches files like <code>Cargo.toml</code> or <code>languages.toml</code>.</li>
</ol>
<h2id="language-server-configuration"><aclass="header"href="#language-server-configuration">Language Server configuration</a></h2>
<p>Language servers are configured separately in the table <code>language-server</code> in the same file as the languages <code>languages.toml</code></p>
<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>environment</code></td><td>Any environment variables that will be used when starting the language server <code>{ "KEY1" = "Value1", "KEY2" = "Value2" }</code></td></tr>
<tr><td><code>required-root-patterns</code></td><td>A list of <code>glob</code> patterns to look for in the working directory. The language server is started if at least one of them is found.</td></tr>
</tbody></table>
</div>
<p>A <code>format</code> sub-table within <code>config</code> can be used to pass extra formatting options to
# pass format options according to https://github.com/typescript-language-server/typescript-language-server#workspacedidchangeconfiguration omitting the "[language].format." prefix.
<h3id="configuring-language-servers-for-a-language"><aclass="header"href="#configuring-language-servers-for-a-language">Configuring Language Servers for a language</a></h3>
<p>The <code>language-servers</code> attribute in a language tells helix which language servers are used for this language.</p>
<p>They have to be defined in the <code>[language-server]</code> table as described in the previous section.</p>
<p>Different languages can use the same language server instance, e.g. <code>typescript-language-server</code> is used for javascript, jsx, tsx and typescript by default.</p>
<p>The definition order of language servers affects the order in the results list of code action menu.</p>
<p>In case multiple language servers are specified in the <code>language-servers</code> attribute of a <code>language</code>,
it's often useful to only enable/disable certain language-server features for these language servers.</p>
<p>As an example, <code>efm-lsp-prettier</code> of the previous example is used only with a formatting command <code>prettier</code>,
so everything else should be handled by the <code>typescript-language-server</code> (which is configured by default).
The language configuration for typescript could look like this:</p>
<p>Each requested LSP feature is prioritized in the order of the <code>language-servers</code> array.
For example, the first <code>goto-definition</code> supported language server (in this case <code>typescript-language-server</code>) will be taken for the relevant LSP request (command <code>goto_definition</code>).
The features <code>diagnostics</code>, <code>code-action</code>, <code>completion</code>, <code>document-symbols</code> and <code>workspace-symbols</code> are an exception to that rule, as they are working for all language servers at the same time and are merged together, if enabled for the language.
If no <code>except-features</code> or <code>only-features</code> is given, all features for the language server are enabled.
If a language server itself doesn't support a feature, the next language server array entry will be tried (and so on).</p>
<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>
<divstyle="break-before: page; page-break-before: always;"></div><h2id="adding-new-languages-to-helix"><aclass="header"href="#adding-new-languages-to-helix">Adding new languages to Helix</a></h2>
<li>If you encounter errors when running Helix after switching branches, you may
need to update the tree-sitter grammars. Run the command <code>hx --grammar fetch</code>
to fetch the grammars and <code>hx --grammar build</code> to build any out-of-date
grammars.</li>
<li>If a parser is causing a segfault, or you want to remove it, make sure to
remove the compiled parser located at <code>runtime/grammars/<name>.so</code>.</li>
<li>If you are attempting to add queries and Helix is unable to locate them, ensure that the environment variable <code>HELIX_RUNTIME</code> is set to the location of the <code>runtime</code> folder you're developing in.</li>
<p>Helix supports textobjects that are language specific, such as functions, classes, etc.
These textobjects require an accompanying tree-sitter grammar and a <code>textobjects.scm</code> query file
to work properly. Tree-sitter allows us to query the source code syntax tree
and capture specific parts of it. The queries are written in a lisp dialect.
More information on how to write queries can be found in the <ahref="https://tree-sitter.github.io/tree-sitter/using-parsers#query-syntax">official tree-sitter
documentation</a>.</p>
<p>Query files should be placed in <code>runtime/queries/{language}/textobjects.scm</code>
when contributing to Helix. Note that to test the query files locally you should put
them under your local runtime directory (<code>~/.config/helix/runtime</code> on Linux
for example).</p>
<p>The following <ahref="https://tree-sitter.github.io/tree-sitter/using-parsers#capturing-nodes">captures</a> are recognized:</p>
<p><ahref="https://github.com/search?q=repo%3Ahelix-editor%2Fhelix+path%3A%2A%2A/textobjects.scm&type=Code&ref=advsearch&l=&l=">Example query files</a> can be found in the helix GitHub repository.</p>
<h2id="queries-for-textobject-based-navigation"><aclass="header"href="#queries-for-textobject-based-navigation">Queries for textobject based navigation</a></h2>
<p>Tree-sitter based navigation in Helix is done using captures in the
following order:</p>
<ul>
<li><code>object.movement</code></li>
<li><code>object.around</code></li>
<li><code>object.inside</code></li>
</ul>
<p>For example if a <code>function.around</code> capture has been already defined for a language
in its <code>textobjects.scm</code> file, function navigation should also work automatically.
<code>function.movement</code> should be defined only if the node captured by <code>function.around</code>
<p>Helix uses tree-sitter to correctly indent new lines. This requires a tree-
sitter grammar and an <code>indent.scm</code> query file placed in <code>runtime/queries/ {language}/indents.scm</code>. The indentation for a line is calculated by traversing
the syntax tree from the lowest node at the beginning of the new line (see
<ahref="guides/indent.html#indent-queries">Indent queries</a>). Each of these nodes contributes to the total
indent when it is captured by the query (in what way depends on the name of
the capture.</p>
<p>Note that it matters where these added indents begin. For example,
multiple indent level increases that start on the same line only increase
the total indent level by 1. See <ahref="guides/indent.html#capture-types">Capture types</a>.</p>
<p>By default, Helix uses the <code>hybrid</code> indentation heuristic. This means that
indent queries are not used to compute the expected absolute indentation of a
line but rather the expected difference in indentation between the new and an
already existing line. This difference is then added to the actual indentation
of the already existing line. Since this makes errors in the indent queries
harder to find, it is recommended to disable it when testing via
<code>:set indent-heuristic tree-sitter</code>. The rest of this guide assumes that
the <code>tree-sitter</code> heuristic is used.</p>
<p>Writing language injection queries allows one to highlight a specific node as a different language.
In addition to the <ahref="http://tree-sitter.github.io/tree-sitter/syntax-highlighting#language-injection">standard</a> language injection options used by tree-sitter, there
are a few Helix specific extensions that allow for more control.</p>
<p>And example of a simple query that would highlight all strings as bash in Nix:</p>
