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<!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="Wrap text into columns with a given total width."><meta name="keywords" content="rust, rustlang, rust-lang, wrap_columns"><title>wrap_columns 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="wrap_columns" 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="#">wrap_columns</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/lib.rs.html#1046-1097" title="goto source code">[src]</a></span></h1><div class="docblock item-decl"><pre class="rust fn"><code>pub fn wrap_columns<'a, Opt>(<br> text: &<a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.str.html">str</a>, <br> columns: <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.usize.html">usize</a>, <br> total_width_or_options: Opt, <br> left_gap: &<a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.str.html">str</a>, <br> middle_gap: &<a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.str.html">str</a>, <br> right_gap: &<a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.str.html">str</a><br>) -> <a class="struct" href="https://doc.rust-lang.org/1.59.0/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</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>> <span class="where fmt-newline">where<br> Opt: <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="struct" href="struct.Options.html" title="struct textwrap::Options">Options</a><'a>>, </span></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Wrap text into columns with a given total width.</p>
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<p>The <code>left_gap</code>, <code>middle_gap</code> and <code>right_gap</code> arguments specify the
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strings to insert before, between, and after the columns. The
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total width of all columns and all gaps is specified using the
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<code>total_width_or_options</code> argument. This argument can simply be an
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integer if you want to use default settings when wrapping, or it
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can be a <a href="struct.Options.html" title="Options"><code>Options</code></a> value if you want to customize the wrapping.</p>
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<p>If the columns are narrow, it is recommended to set
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<a href="struct.Options.html#method.break_words" title="Options::break_words"><code>Options::break_words</code></a> to <code>true</code> to prevent words from
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protruding into the margins.</p>
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<p>The per-column width is computed like this:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let</span> <span class="ident">inner_width</span> <span class="op">=</span> <span class="ident">options</span>.<span class="ident">width</span>
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<span class="op">-</span> <span class="ident">textwrap::core::display_width</span>(<span class="ident">left_gap</span>)
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<span class="op">-</span> <span class="ident">textwrap::core::display_width</span>(<span class="ident">right_gap</span>)
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<span class="op">-</span> <span class="ident">textwrap::core::display_width</span>(<span class="ident">middle_gap</span>) <span class="op">*</span> (<span class="ident">columns</span> <span class="op">-</span> <span class="number">1</span>);
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<span class="kw">let</span> <span class="ident">column_width</span> <span class="op">=</span> <span class="ident">inner_width</span> <span class="op">/</span> <span class="ident">columns</span>;</code></pre></div>
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<p>The <code>text</code> is wrapped using <a href="fn.wrap.html" title="wrap"><code>wrap</code></a> and the given <code>options</code>
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argument, but the width is overwritten to the computed
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<code>column_width</code>.</p>
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<h2 id="panics" class="section-header"><a href="#panics">Panics</a></h2>
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<p>Panics if <code>columns</code> is zero.</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::wrap_columns</span>;
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<span class="kw">let</span> <span class="ident">text</span> <span class="op">=</span> <span class="string">"\
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This is an example text, which is wrapped into three columns. \
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Notice how the final column can be shorter than the others."</span>;
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<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"smawk"</span>)]</span>
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<span class="macro">assert_eq!</span>(<span class="ident">wrap_columns</span>(<span class="ident">text</span>, <span class="number">3</span>, <span class="number">50</span>, <span class="string">"| "</span>, <span class="string">" | "</span>, <span class="string">" |"</span>),
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<span class="macro">vec!</span>[<span class="string">"| This is | into three | column can be |"</span>,
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<span class="string">"| an example | columns. | shorter than |"</span>,
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<span class="string">"| text, which | Notice how | the others. |"</span>,
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<span class="string">"| is wrapped | the final | |"</span>]);
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<span class="comment">// Without the `smawk` feature, the middle column is a little more uneven:</span>
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<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"smawk"</span>))]</span>
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<span class="macro">assert_eq!</span>(<span class="ident">wrap_columns</span>(<span class="ident">text</span>, <span class="number">3</span>, <span class="number">50</span>, <span class="string">"| "</span>, <span class="string">" | "</span>, <span class="string">" |"</span>),
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<span class="macro">vec!</span>[<span class="string">"| This is an | three | column can be |"</span>,
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<span class="string">"| example text, | columns. | shorter than |"</span>,
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<span class="string">"| which is | Notice how | the others. |"</span>,
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<span class="string">"| wrapped into | the final | |"</span>]);</code></pre></div>
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