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diff --git a/24.03.1/guides/indent.html b/24.03.1/guides/indent.html deleted file mode 100644 index 25be199a..00000000 --- a/24.03.1/guides/indent.html +++ /dev/null @@ -1,563 +0,0 @@ -<!DOCTYPE HTML> -<html lang="en" class="colibri" dir="ltr"> - <head> - <!-- Book generated using mdBook --> - <meta charset="UTF-8"> - <title>Adding indent queries</title> - - - <!-- Custom HTML head --> - - <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="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 --> - <link rel="stylesheet" href="../custom.css"> - - </head> - <body class="sidebar-visible no-js"> - <div id="body-container"> - <!-- Provide site root to javascript --> - <script> - var path_to_root = "../"; - var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? 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(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> - <a href="https://github.com/helix-editor/helix" title="Git repository" aria-label="Git repository"> - <i id="git-repository-button" class="fa fa-github"></i> - </a> - <a href="https://github.com/helix-editor/helix/edit/master/book/src/guides/indent.md" title="Suggest an edit" aria-label="Suggest an edit"> - <i id="git-edit-button" class="fa fa-edit"></i> - </a> - - </div> - </div> - - <div id="search-wrapper" class="hidden"> - <form id="searchbar-outer" class="searchbar-outer"> - <input type="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> - 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="adding-indent-queries"><a class="header" href="#adding-indent-queries">Adding indent queries</a></h1> -<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 -<a href="#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 <a href="#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> -<h2 id="indent-queries"><a class="header" href="#indent-queries">Indent queries</a></h2> -<p>When Helix is inserting a new line through <code>o</code>, <code>O</code>, or <code><ret></code>, to determine -the indent level for the new line, the query in <code>indents.scm</code> is run on the -document. The starting position of the query is the end of the line above where -a new line will be inserted.</p> -<p>For <code>o</code>, the inserted line is the line below the cursor, so that starting -position of the query is the end of the current line.</p> -<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)] -</span><span class="boring">fn main() { -</span>fn need_hero(some_hero: Hero, life: Life) -> { - matches!(some_hero, Hero { // ←─────────────────╮ - strong: true,//←╮ ↑ ↑ │ - fast: true, // │ │ ╰── query start │ - sure: true, // │ ╰───── cursor ├─ traversal - soon: true, // ╰──────── new line inserted │ start node - }) && // │ -// ↑ │ -// ╰───────────────────────────────────────────────╯ - some_hero > life -} -<span class="boring">}</span></code></pre></pre> -<p>For <code>O</code>, the newly inserted line is the <em>current</em> line, so the starting position -of the query is the end of the line above the cursor.</p> -<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)] -</span><span class="boring">fn main() { -</span>fn need_hero(some_hero: Hero, life: Life) -> { // ←─╮ - matches!(some_hero, Hero { // ←╮ ↑ │ - strong: true,// ↑ ╭───╯ │ │ - fast: true, // │ │ query start ─╯ │ - sure: true, // ╰───┼ cursor ├─ traversal - soon: true, // ╰ new line inserted │ start node - }) && // │ - some_hero > life // │ -} // ←──────────────────────────────────────────────╯ -<span class="boring">}</span></code></pre></pre> -<p>From this starting node, the syntax tree is traversed up until the root node. -Each indent capture is collected along the way, and then combined according to -their <a href="#capture-types">capture types</a> and <a href="#scopes">scopes</a> to a final indent -level for the line.</p> -<h3 id="capture-types"><a class="header" href="#capture-types">Capture types</a></h3> -<ul> -<li><code>@indent</code> (default scope <code>tail</code>): -Increase the indent level by 1. Multiple occurrences in the same line <em>do not</em> -stack. If there is at least one <code>@indent</code> and one <code>@outdent</code> capture on the -same line, the indent level isn't changed at all.</li> -<li><code>@outdent</code> (default scope <code>all</code>): -Decrease the indent level by 1. The same rules as for <code>@indent</code> apply.</li> -<li><code>@indent.always</code> (default scope <code>tail</code>): -Increase the indent level by 1. Multiple occurrences on the same line <em>do</em> -stack. The final indent level is <code>@indent.always</code> – <code>@outdent.always</code>. If -an <code>@indent</code> and an <code>@indent.always</code> are on the same line, the <code>@indent</code> is -ignored.</li> -<li><code>@outdent.always</code> (default scope <code>all</code>): -Decrease the indent level by 1. The same rules as for <code>@indent.always</code> apply.</li> -<li><code>@align</code> (default scope <code>all</code>): -Align everything inside this node to some anchor. The anchor is given -by the start of the node captured by <code>@anchor</code> in the same pattern. -Every pattern with an <code>@align</code> should contain exactly one <code>@anchor</code>. -Indent (and outdent) for nodes below (in terms of their starting line) -the <code>@align</code> node is added to the indentation required for alignment.</li> -<li><code>@extend</code>: -Extend the range of this node to the end of the line and to lines that are -indented more than the line that this node starts on. This is useful for -languages like Python, where for the purpose of indentation some nodes (like -functions or classes) should also contain indented lines that follow them.</li> -<li><code>@extend.prevent-once</code>: -Prevents the first extension of an ancestor of this node. For example, in Python -a return expression always ends the block that it is in. Note that this only -stops the extension of the next <code>@extend</code> capture. If multiple ancestors are -captured, only the extension of the innermost one is prevented. All other -ancestors are unaffected (regardless of whether the innermost ancestor would -actually have been extended).</li> -</ul> -<h4 id="indent--outdent"><a class="header" href="#indent--outdent"><code>@indent</code> / <code>@outdent</code></a></h4> -<p>Consider this example:</p> -<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)] -</span><span class="boring">fn main() { -</span>fn shout(things: Vec<Thing>) { - // ↑ - // ├───────────────────────╮ indent level - // @indent ├┄┄┄┄┄┄┄┄┄┄┄┄┄┄ - // │ - let it_all = |out| { things.filter(|thing| { // │ 1 - // ↑ ↑ │ - // ├───────────────────────┼─────┼┄┄┄┄┄┄┄┄┄┄┄┄┄┄ - // @indent @indent │ - // │ 2 - thing.can_do_with(out) // │ - })}; // ├┄┄┄┄┄┄┄┄┄┄┄┄┄┄ - //↑↑↑ │ 1 -} //╰┼┴──────────────────────────────────────────────┴┄┄┄┄┄┄┄┄┄┄┄┄┄┄ -// 3x @outdent -<span class="boring">}</span></code></pre></pre> -<pre><code class="language-scm">((block) @indent) -["}" ")"] @outdent -</code></pre> -<p>Note how on the second line, we have two blocks begin on the same line. In this -case, since both captures occur on the same line, they are combined and only -result in a net increase of 1. Also note that the closing <code>}</code>s are part of the -<code>@indent</code> captures, but the 3 <code>@outdent</code>s also combine into 1 and result in that -line losing one indent level.</p> -<h4 id="extend--extendprevent-once"><a class="header" href="#extend--extendprevent-once"><code>@extend</code> / <code>@extend.prevent-once</code></a></h4> -<p>For an example of where <code>@extend</code> can be useful, consider Python, which is -whitespace-sensitive.</p> -<pre><code class="language-scm">] - (parenthesized_expression) - (function_definition) - (class_definition) -] @indent - -</code></pre> -<pre><code class="language-python">class Hero: - def __init__(self, strong, fast, sure, soon):# ←─╮ - self.is_strong = strong # │ - self.is_fast = fast # ╭─── query start │ - self.is_sure = sure # │ ╭─ cursor │ - self.is_soon = soon # │ │ │ - # ↑ ↑ │ │ │ - # │ ╰──────╯ │ │ - # ╰─────────────────────╯ │ - # ├─ traversal - def need_hero(self, life): # │ start node - return ( # │ - self.is_strong # │ - and self.is_fast # │ - and self.is_sure # │ - and self.is_soon # │ - and self > life # │ - ) # ←─────────────────────────────────────────╯ -</code></pre> -<p>Without braces to catch the scope of the function, the smallest descendant of -the cursor on a line feed ends up being the entire inside of the class. Because -of this, it will miss the entire function node and its indent capture, leading -to an indent level one too small.</p> -<p>To address this case, <code>@extend</code> tells helix to "extend" the captured node's span -to the line feed and every consecutive line that has a greater indent level than -the line of the node.</p> -<pre><code class="language-scm">(parenthesized_expression) @indent - -] - (function_definition) - (class_definition) -] @indent @extend - -</code></pre> -<pre><code class="language-python">class Hero: - def __init__(self, strong, fast, sure, soon):# ←─╮ - self.is_strong = strong # │ - self.is_fast = fast # ╭─── query start ├─ traversal - self.is_sure = sure # │ ╭─ cursor │ start node - self.is_soon = soon # │ │ ←───────────────╯ - # ↑ ↑ │ │ - # │ ╰──────╯ │ - # ╰─────────────────────╯ - def need_hero(self, life): - return ( - self.is_strong - and self.is_fast - and self.is_sure - and self.is_soon - and self > life - ) -</code></pre> -<p>Furthermore, there are some cases where extending to everything with a greater -indent level may not be desirable. Consider the <code>need_hero</code> function above. If -our cursor is on the last line of the returned expression.</p> -<pre><code class="language-python">class Hero: - def __init__(self, strong, fast, sure, soon): - self.is_strong = strong - self.is_fast = fast - self.is_sure = sure - self.is_soon = soon - - def need_hero(self, life): - return ( - self.is_strong - and self.is_fast - and self.is_sure - and self.is_soon - and self > life - ) # ←─── cursor - #←────────── where cursor should go on new line -</code></pre> -<p>In Python, the are a few tokens that will always end a scope, such as a return -statement. Since the scope ends, so should the indent level. But because the -function span is extended to every line with a greater indent level, a new line -would just continue on the same level. And an <code>@outdent</code> would not help us here -either, since it would cause everything in the parentheses to become outdented -as well.</p> -<p>To help, we need to signal an end to the extension. We can do this with -<code>@extend.prevent-once</code>.</p> -<pre><code class="language-scm">(parenthesized_expression) @indent - -] - (function_definition) - (class_definition) -] @indent @extend - -(return_statement) @extend.prevent-once -</code></pre> -<h4 id="indentalways--outdentalways"><a class="header" href="#indentalways--outdentalways"><code>@indent.always</code> / <code>@outdent.always</code></a></h4> -<p>As mentioned before, normally if there is more than one <code>@indent</code> or <code>@outdent</code> -capture on the same line, they are combined.</p> -<p>Sometimes, there are cases when you may want to ensure that every indent capture -is additive, regardless of how many occur on the same line. Consider this -example in YAML.</p> -<pre><code class="language-yaml"> - foo: bar -# ↑ ↑ -# │ ╰─────────────── start of map -# ╰───────────────── start of list element - baz: quux # ←─── cursor - # ←───────────── where the cursor should go on a new line - garply: waldo - - quux: - bar: baz - xyzzy: thud - fred: plugh -</code></pre> -<p>In YAML, you often have lists of maps. In these cases, the syntax is such that -the list element and the map both start on the same line. But we really do want -to start an indentation for each of these so that subsequent keys in the map -hang over the list and align properly. This is where <code>@indent.always</code> helps.</p> -<pre><code class="language-scm">((block_sequence_item) @item @indent.always @extend - (#not-one-line? @item)) - -((block_mapping_pair - key: (_) @key - value: (_) @val - (#not-same-line? @key @val) - ) @indent.always @extend -) -</code></pre> -<h2 id="predicates"><a class="header" href="#predicates">Predicates</a></h2> -<p>In some cases, an S-expression cannot express exactly what pattern should be matched. -For that, tree-sitter allows for predicates to appear anywhere within a pattern, -similar to how <code>#set!</code> declarations work:</p> -<pre><code class="language-scm">(some_kind - (child_kind) @indent - (#predicate? arg1 arg2 ...) -) -</code></pre> -<p>The number of arguments depends on the predicate that's used. -Each argument is either a capture (<code>@name</code>) or a string (<code>"some string"</code>). -The following predicates are supported by tree-sitter:</p> -<ul> -<li> -<p><code>#eq?</code>/<code>#not-eq?</code>: -The first argument (a capture) must/must not be equal to the second argument -(a capture or a string).</p> -</li> -<li> -<p><code>#match?</code>/<code>#not-match?</code>: -The first argument (a capture) must/must not match the regex given in the -second argument (a string).</p> -</li> -<li> -<p><code>#any-of?</code>/<code>#not-any-of?</code>: -The first argument (a capture) must/must not be one of the other arguments -(strings).</p> -</li> -</ul> -<p>Additionally, we support some custom predicates for indent queries:</p> -<ul> -<li> -<p><code>#not-kind-eq?</code>: -The kind of the first argument (a capture) must not be equal to the second -argument (a string).</p> -</li> -<li> -<p><code>#same-line?</code>/<code>#not-same-line?</code>: -The captures given by the 2 arguments must/must not start on the same line.</p> -</li> -<li> -<p><code>#one-line?</code>/<code>#not-one-line?</code>: -The captures given by the fist argument must/must span a total of one line.</p> -</li> -</ul> -<h3 id="scopes"><a class="header" href="#scopes">Scopes</a></h3> -<p>Added indents don't always apply to the whole node. For example, in most -cases when a node should be indented, we actually only want everything -except for its first line to be indented. For this, there are several -scopes (more scopes may be added in the future if required):</p> -<ul> -<li><code>tail</code>: -This scope applies to everything except for the first line of the -captured node.</li> -<li><code>all</code>: -This scope applies to the whole captured node. This is only different from -<code>tail</code> when the captured node is the first node on its line.</li> -</ul> -<p>For example, imagine we have the following function</p> -<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)] -</span><span class="boring">fn main() { -</span>fn aha() { // ←─────────────────────────────────────╮ - let take = "on me"; // ←──────────────╮ scope: │ - let take = "me on"; // ├─ "tail" ├─ (block) @indent - let ill = be_gone_days(1 || 2); // │ │ -} // ←───────────────────────────────────┴──────────┴─ "}" @outdent - // scope: "all" -<span class="boring">}</span></code></pre></pre> -<p>We can write the following query with the <code>#set!</code> declaration:</p> -<pre><code class="language-scm">((block) @indent - (#set! "scope" "tail")) -("}" @outdent - (#set! "scope" "all")) -</code></pre> -<p>As we can see, the "tail" scope covers the node, except for the first line. -Everything up to and including the closing brace gets an indent level of 1. -Then, on the closing brace, we encounter an outdent with a scope of "all", which -means the first line is included, and the indent level is cancelled out on this -line. 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