34 lines
7.2 KiB
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34 lines
7.2 KiB
HTML
<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Indent each line by the given prefix."><meta name="keywords" content="rust, rustlang, rust-lang, indent"><title>indent in textwrap - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script src="../crates.js"></script><script defer src="../main.js"></script>
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</a><div class="sidebar-elems"><h2 class="location">Other items in<br><a href="index.html">textwrap</a></h2><div id="sidebar-vars" data-name="indent" data-ty="fn" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../textwrap/index.html"><img class="rust-logo" src="../rust-logo.png" alt="logo"></a><nav class="sub"><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../brush.svg"></button><div id="theme-choices" role="menu"></div></div><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../wheel.svg"></a></div></form></nav></div><section id="main-content" class="content"><h1 class="fqn"><span class="in-band">Function <a href="index.html">textwrap</a>::<wbr><a class="fn" href="#">indent</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span><a class="srclink" href="../src/textwrap/indentation.rs.html#52-75" title="goto source code">[src]</a></span></h1><div class="docblock item-decl"><pre class="rust fn"><code>pub fn indent(s: &<a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.str.html">str</a>, prefix: &<a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.str.html">str</a>) -> <a class="struct" href="https://doc.rust-lang.org/1.59.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Indent each line by the given prefix.</p>
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<h2 id="examples" class="section-header"><a href="#examples">Examples</a></h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">textwrap::indent</span>;
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<span class="macro">assert_eq!</span>(<span class="ident">indent</span>(<span class="string">"First line.\nSecond line.\n"</span>, <span class="string">" "</span>),
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<span class="string">" First line.\n Second line.\n"</span>);</code></pre></div>
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<p>When indenting, trailing whitespace is stripped from the prefix.
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This means that empty lines remain empty afterwards:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">textwrap::indent</span>;
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<span class="macro">assert_eq!</span>(<span class="ident">indent</span>(<span class="string">"First line.\n\n\nSecond line.\n"</span>, <span class="string">" "</span>),
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<span class="string">" First line.\n\n\n Second line.\n"</span>);</code></pre></div>
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<p>Notice how <code>"\n\n\n"</code> remained as <code>"\n\n\n"</code>.</p>
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<p>This feature is useful when you want to indent text and have a
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space between your prefix and the text. In this case, you <em>don’t</em>
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want a trailing space on empty lines:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">textwrap::indent</span>;
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<span class="macro">assert_eq!</span>(<span class="ident">indent</span>(<span class="string">"foo = 123\n\nprint(foo)\n"</span>, <span class="string">"# "</span>),
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<span class="string">"# foo = 123\n#\n# print(foo)\n"</span>);</code></pre></div>
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<p>Notice how <code>"\n\n"</code> became <code>"\n#\n"</code> instead of <code>"\n# \n"</code> which
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would have trailing whitespace.</p>
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<p>Leading and trailing whitespace coming from the text itself is
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kept unchanged:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">textwrap::indent</span>;
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<span class="macro">assert_eq!</span>(<span class="ident">indent</span>(<span class="string">" \t Foo "</span>, <span class="string">"->"</span>), <span class="string">"-> \t Foo "</span>);</code></pre></div>
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