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313 lines
20 KiB
HTML
313 lines
20 KiB
HTML
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<ol class="chapter"><li class="chapter-item expanded affix "><a href="title-page.html">Helix</a></li><li class="chapter-item expanded "><a href="install.html"><strong aria-hidden="true">1.</strong> Installation</a></li><li class="chapter-item expanded "><a href="usage.html" class="active"><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="languages.html"><strong aria-hidden="true">4.3.</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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<div id="content" class="content">
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<main>
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<h1 id="usage"><a class="header" href="#usage">Usage</a></h1>
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<p>(Currently not fully documented, see the <a href="./keymap.html">keymappings</a> list for more.)</p>
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<p>See <a href="https://github.com/helix-editor/helix/blob/master/runtime/tutor">tutor</a> (accessible via <code>hx --tutor</code> or <code>:tutor</code>) for a vimtutor-like introduction.</p>
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<h2 id="registers"><a class="header" href="#registers">Registers</a></h2>
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<p>Vim-like registers can be used to yank and store text to be pasted later. Usage is similar, with <code>"</code> being used to select a register:</p>
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<ul>
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<li><code>"ay</code> - Yank the current selection to register <code>a</code>.</li>
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<li><code>"op</code> - Paste the text in register <code>o</code> after the selection.</li>
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</ul>
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<p>If there is a selected register before invoking a change or delete command, the selection will be stored in the register and the action will be carried out:</p>
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<ul>
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<li><code>"hc</code> - Store the selection in register <code>h</code> and then change it (delete and enter insert mode).</li>
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<li><code>"md</code> - Store the selection in register <code>m</code> and delete it.</li>
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</ul>
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<h3 id="special-registers"><a class="header" href="#special-registers">Special Registers</a></h3>
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<div class="table-wrapper"><table><thead><tr><th>Register character</th><th>Contains</th></tr></thead><tbody>
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<tr><td><code>/</code></td><td>Last search</td></tr>
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<tr><td><code>:</code></td><td>Last executed command</td></tr>
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<tr><td><code>"</code></td><td>Last yanked text</td></tr>
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<tr><td><code>_</code></td><td>Black hole</td></tr>
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</tbody></table>
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</div>
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<blockquote>
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<p>There is no special register for copying to system clipboard, instead special commands and keybindings are provided. See the <a href="keymap.html#space-mode">keymap</a> for the specifics.
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The black hole register works as a no-op register, meaning no data will be written to / read from it.</p>
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</blockquote>
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<h2 id="surround"><a class="header" href="#surround">Surround</a></h2>
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<p>Functionality similar to <a href="https://github.com/tpope/vim-surround">vim-surround</a> is built into
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helix. The keymappings have been inspired from <a href="https://github.com/machakann/vim-sandwich">vim-sandwich</a>:</p>
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<p><img src="https://user-images.githubusercontent.com/23398472/122865801-97073180-d344-11eb-8142-8f43809982c6.gif" alt="surround demo" /></p>
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<ul>
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<li><code>ms</code> - Add surround characters</li>
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<li><code>mr</code> - Replace surround characters</li>
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<li><code>md</code> - Delete surround characters</li>
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</ul>
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<p><code>ms</code> acts on a selection, so select the text first and use <code>ms<char></code>. <code>mr</code> and <code>md</code> work
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on the closest pairs found and selections are not required; use counts to act in outer pairs.</p>
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<p>It can also act on multiple selections (yay!). For example, to change every occurrence of <code>(use)</code> to <code>[use]</code>:</p>
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<ul>
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<li><code>%</code> to select the whole file</li>
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<li><code>s</code> to split the selections on a search term</li>
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<li>Input <code>use</code> and hit Enter</li>
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<li><code>mr([</code> to replace the parens with square brackets</li>
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</ul>
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<p>Multiple characters are currently not supported, but planned.</p>
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<h2 id="syntax-tree-motions"><a class="header" href="#syntax-tree-motions">Syntax-tree Motions</a></h2>
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<p><code>A-p</code>, <code>A-o</code>, <code>A-i</code>, and <code>A-n</code> (or <code>Alt</code> and arrow keys) move the primary
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selection according to the selection's place in the syntax tree. Let's walk
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through an example to get familiar with them. Many languages have a syntax like
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so for function calls:</p>
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<pre><code>func(arg1, arg2, arg3)
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</code></pre>
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<p>A function call might be parsed by tree-sitter into a tree like the following.</p>
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<pre><code class="language-tsq">(call
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function: (identifier) ; func
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arguments:
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(arguments ; (arg1, arg2, arg3)
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(identifier) ; arg1
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(identifier) ; arg2
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(identifier))) ; arg3
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</code></pre>
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<p>Use <code>:tree-sitter-subtree</code> to view the syntax tree of the primary selection. In
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a more intuitive tree format:</p>
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<pre><code> ┌────┐
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│call│
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┌─────┴────┴─────┐
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│ │
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┌─────▼────┐ ┌────▼────┐
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│identifier│ │arguments│
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│ "func" │ ┌────┴───┬─────┴───┐
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└──────────┘ │ │ │
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│ │ │
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┌─────────▼┐ ┌────▼─────┐ ┌▼─────────┐
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│identifier│ │identifier│ │identifier│
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│ "arg1" │ │ "arg2" │ │ "arg3" │
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└──────────┘ └──────────┘ └──────────┘
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</code></pre>
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<p>Say we have a selection that wraps <code>arg1</code>. The selection is on the <code>arg1</code> leaf
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in the tree above.</p>
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<pre><code>func([arg1], arg2, arg3)
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</code></pre>
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<p>Using <code>A-n</code> would select the next sibling in the syntax tree: <code>arg2</code>.</p>
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<pre><code>func(arg1, [arg2], arg3)
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</code></pre>
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<p>While <code>A-o</code> would expand the selection to the parent node. In the tree above we
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can see that we would select the <code>arguments</code> node.</p>
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<pre><code>func[(arg1, arg2, arg3)]
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</code></pre>
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<p>There is also some nuanced behavior that prevents you from getting stuck on a
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node with no sibling. If we have a selection on <code>arg1</code>, <code>A-p</code> would bring us
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to the previous child node. Since <code>arg1</code> doesn't have a sibling to its left,
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though, we climb the syntax tree and then take the previous selection. So <code>A-p</code>
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will move the selection over to the "func" <code>identifier</code>.</p>
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<pre><code>[func](arg1, arg2, arg3)
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</code></pre>
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<h2 id="textobjects"><a class="header" href="#textobjects">Textobjects</a></h2>
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<p><img src="https://user-images.githubusercontent.com/23398472/124231131-81a4bb00-db2d-11eb-9d10-8e577ca7b177.gif" alt="textobject-demo" />
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<img src="https://user-images.githubusercontent.com/23398472/132537398-2a2e0a54-582b-44ab-a77f-eb818942203d.gif" alt="textobject-treesitter-demo" /></p>
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<ul>
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<li><code>ma</code> - Select around the object (<code>va</code> in Vim, <code><alt-a></code> in Kakoune)</li>
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<li><code>mi</code> - Select inside the object (<code>vi</code> in Vim, <code><alt-i></code> in Kakoune)</li>
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</ul>
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<div class="table-wrapper"><table><thead><tr><th>Key after <code>mi</code> or <code>ma</code></th><th>Textobject selected</th></tr></thead><tbody>
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<tr><td><code>w</code></td><td>Word</td></tr>
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<tr><td><code>W</code></td><td>WORD</td></tr>
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<tr><td><code>p</code></td><td>Paragraph</td></tr>
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<tr><td><code>(</code>, <code>[</code>, <code>'</code>, etc</td><td>Specified surround pairs</td></tr>
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<tr><td><code>m</code></td><td>Closest surround pair</td></tr>
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<tr><td><code>f</code></td><td>Function</td></tr>
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<tr><td><code>c</code></td><td>Class</td></tr>
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<tr><td><code>a</code></td><td>Argument/parameter</td></tr>
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<tr><td><code>o</code></td><td>Comment</td></tr>
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<tr><td><code>t</code></td><td>Test</td></tr>
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</tbody></table>
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</div>
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<blockquote>
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<p>NOTE: <code>f</code>, <code>c</code>, etc need a tree-sitter grammar active for the current
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document and a special tree-sitter query file to work properly. <a href="./lang-support.html">Only
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some grammars</a> currently have the query file implemented.
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Contributions are welcome!</p>
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</blockquote>
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<h2 id="tree-sitter-textobject-based-navigation"><a class="header" href="#tree-sitter-textobject-based-navigation">Tree-sitter Textobject Based Navigation</a></h2>
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<p>Navigating between functions, classes, parameters, etc is made
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possible by leveraging tree-sitter and textobjects queries. For
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example to move to the next function use <code>]f</code>, to move to previous
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class use <code>[c</code>, and so on.</p>
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<p><img src="https://user-images.githubusercontent.com/23398472/152332550-7dfff043-36a2-4aec-b8f2-77c13eb56d6f.gif" alt="tree-sitter-nav-demo" /></p>
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<p>See the <a href="./keymap.html#unimpaired">unimpaired</a> section of the keybind
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documentation for the full reference.</p>
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<blockquote>
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<p>NOTE: This feature is dependent on tree-sitter based textobjects
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and therefore requires the corresponding query file to work properly.</p>
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</blockquote>
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</main>
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