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diff --git a/master/guides/indent.html b/master/guides/indent.html new file mode 100644 index 00000000..25be199a --- /dev/null +++ b/master/guides/indent.html @@ -0,0 +1,563 @@ +<!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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