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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="Command Line Argument Parser for Rust"><title>clap - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-5bc39a1768837dd0.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="clap" data-themes="" data-resource-suffix="" data-rustdoc-version="1.77.0 (aedd173a2 2024-03-17)" data-channel="1.77.0" data-search-js="search-dd67cee4cfa65049.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-4c98445ec4002617.js"></script><script defer src="../crates.js"></script><script defer src="../static.files/main-48f368f3872407c8.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-04d5337699b92874.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc mod crate"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../clap/index.html"><img src="https://raw.githubusercontent.com/clap-rs/clap/master/assets/clap.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../clap/index.html"><img src="https://raw.githubusercontent.com/clap-rs/clap/master/assets/clap.png" alt="logo"></a><h2><a href="../clap/index.html">clap</a><span class="version">4.5.4</span></h2></div><div class="sidebar-elems"><ul class="block">
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../clap/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Crate <a class="mod" href="#">clap</a><button id="copy-path" title="Copy item path to clipboard"><img src="../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../src/clap/lib.rs.html#6-115">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><blockquote>
<p><strong>Command Line Argument Parser for Rust</strong></p>
</blockquote>
<p>Quick Links:</p>
<ul>
<li>Derive [tutorial][_derive::_tutorial::chapter_0] and [reference][_derive]</li>
<li>Builder [tutorial][_tutorial::chapter_0] and <a href="index.html">reference</a></li>
<li>[Cookbook][_cookbook]</li>
<li>[FAQ][_faq]</li>
<li><a href="https://github.com/clap-rs/clap/discussions">Discussions</a></li>
<li><a href="https://github.com/clap-rs/clap/blob/v4.5.4/CHANGELOG.md">CHANGELOG</a> (includes major version migration
guides)</li>
</ul>
<h3 id="aspirations"><a class="doc-anchor" href="#aspirations">§</a>Aspirations</h3>
<ul>
<li>Out of the box, users get a polished CLI experience
<ul>
<li>Including common argument behavior, help generation, suggested fixes for users, colored output, <a href="https://github.com/clap-rs/clap/tree/master/clap_complete">shell completions</a>, etc</li>
</ul>
</li>
<li>Flexible enough to port your existing CLI interface
<ul>
<li>However, we won’t necessarily streamline support for each use case</li>
</ul>
</li>
<li>Reasonable parse performance</li>
<li>Resilient maintainership, including
<ul>
<li>Willing to break compatibility rather than batching up breaking changes in large releases</li>
<li>Leverage feature flags to keep to one active branch</li>
<li>Being under <a href="https://github.com/rust-cli/team/">WG-CLI</a> to increase the bus factor</li>
</ul>
</li>
<li>We follow semver and will wait about 6-9 months between major breaking changes</li>
<li>We will support the last two minor Rust releases (MSRV, currently 1.74)</li>
</ul>
<p>While these aspirations can be at odds with fast build times and low binary
size, we will still strive to keep these reasonable for the flexibility you
get. Check out the
<a href="https://github.com/rust-cli/argparse-benchmarks-rs">argparse-benchmarks</a> for
CLI parsers optimized for other use cases.</p>
<h3 id="example"><a class="doc-anchor" href="#example">§</a>Example</h3>
<p>Run</p>
<div class="example-wrap"><pre class="language-console"><code>$ cargo add clap --features derive
</code></pre></div>
<p><em>(See also [feature flag reference][_features])</em></p>
<p>Then define your CLI in <code>main.rs</code>:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>clap::Parser;
<span class="doccomment">/// Simple program to greet a person
</span><span class="attr">#[derive(Parser, Debug)]
#[command(version, about, long_about = <span class="prelude-val">None</span>)]
</span><span class="kw">struct </span>Args {
<span class="doccomment">/// Name of the person to greet
</span><span class="attr">#[arg(short, long)]
</span>name: String,
<span class="doccomment">/// Number of times to greet
</span><span class="attr">#[arg(short, long, default_value_t = <span class="number">1</span>)]
</span>count: u8,
}
<span class="kw">fn </span>main() {
<span class="kw">let </span>args = Args::parse();
<span class="kw">for _ in </span><span class="number">0</span>..args.count {
<span class="macro">println!</span>(<span class="string">"Hello {}!"</span>, args.name)
}
}</code></pre></div>
<p>And try it out:</p>
<div class="example-wrap"><pre class="language-console"><code>$ demo --help
A simple to use, efficient, and full-featured Command Line Argument Parser
Usage: demo[EXE] [OPTIONS] --name &lt;NAME&gt;
Options:
-n, --name &lt;NAME&gt; Name of the person to greet
-c, --count &lt;COUNT&gt; Number of times to greet [default: 1]
-h, --help Print help
-V, --version Print version
$ demo --name Me
Hello Me!
</code></pre></div>
<p><em>(version number and <code>.exe</code> extension on windows replaced by placeholders)</em></p>
<p>See also the derive [tutorial][_derive::_tutorial] and [reference][_derive]</p>
<h4 id="related-projects"><a class="doc-anchor" href="#related-projects">§</a>Related Projects</h4>
<p>Augment clap:</p>
<ul>
<li><a href="https://crates.io/crates/wild">wild</a> for supporting wildcards (<code>*</code>) on Windows like you do Linux</li>
<li><a href="https://crates.io/crates/argfile">argfile</a> for loading additional arguments from a file (aka response files)</li>
<li><a href="https://crates.io/crates/shadow-rs">shadow-rs</a> for generating <code>Command::long_version</code></li>
<li><a href="https://crates.io/crates/clap_mangen">clap_mangen</a> for generating man page source (roff)</li>
<li><a href="https://crates.io/crates/clap_complete">clap_complete</a> for shell completion support</li>
</ul>
<p>CLI Helpers</p>
<ul>
<li><a href="https://crates.io/crates/clio">cio</a> for reading/writing to files specified as arguments</li>
<li><a href="https://crates.io/crates/clap-verbosity-flag">clap-verbosity-flag</a></li>
<li><a href="https://crates.io/crates/clap-cargo">clap-cargo</a></li>
<li><a href="https://crates.io/crates/concolor-clap">concolor-clap</a></li>
</ul>
<p>Testing</p>
<ul>
<li><a href="https://crates.io/crates/trycmd"><code>trycmd</code></a>: Bulk snapshot testing</li>
<li><a href="https://crates.io/crates/snapbox"><code>snapbox</code></a>: Specialized snapshot testing</li>
<li><a href="https://crates.io/crates/assert_cmd"><code>assert_cmd</code></a> and <a href="https://crates.io/crates/assert_fs"><code>assert_fs</code></a>: Customized testing</li>
</ul>
<p>Documentation:</p>
<ul>
<li><a href="https://rust-cli.github.io/book/index.html">Command-line Apps for Rust</a> book</li>
</ul>
</div></details><h2 id="modules" class="section-header">Modules<a href="#modules" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="mod" href="builder/index.html" title="mod clap::builder">builder</a></div><div class="desc docblock-short">Define <a href="struct.Command.html" title="struct clap::Command"><code>Command</code></a> line <a href="struct.Arg.html" title="struct clap::Arg">arguments</a></div></li><li><div class="item-name"><a class="mod" href="error/index.html" title="mod clap::error">error</a></div><div class="desc docblock-short">Error reporting</div></li><li><div class="item-name"><a class="mod" href="parser/index.html" title="mod clap::parser">parser</a></div><div class="desc docblock-short"><a href="struct.Command.html" title="struct clap::Command"><code>Command</code></a> line argument parser</div></li></ul><h2 id="macros" class="section-header">Macros<a href="#macros" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="macro" href="macro.arg.html" title="macro clap::arg">arg</a></div><div class="desc docblock-short">Create an <a href="struct.Arg.html" title="struct clap::Arg"><code>Arg</code></a> from a usage string.</div></li><li><div class="item-name"><a class="macro" href="macro.command.html" title="macro clap::command">command</a></div><div class="desc docblock-short">Requires <code>cargo</code> feature flag to be enabled.</div></li><li><div class="item-name"><a class="macro" href="macro.value_parser.html" title="macro clap::value_parser">value_parser</a></div><div class="desc docblock-short">Select a <a href="builder/struct.ValueParser.html" title="struct clap::builder::ValueParser"><code>ValueParser</code></a> implementation from the intended type</div></li></ul><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.Arg.html" title="struct clap::Arg">Arg</a></div><div class="desc docblock-short">The abstract representation of a command line argument. Used to set all the options and
relationships that define a valid argument for the program.</div></li><li><div class="item-name"><a class="struct" href="struct.ArgGroup.html" title="struct clap::ArgGroup">ArgGroup</a></div><div class="desc docblock-short">Family of related <a href="struct.Arg.html" title="struct clap::Arg">arguments</a>.</div></li><li><div class="item-name"><a class="struct" href="struct.ArgMatches.html" title="struct clap::ArgMatches">ArgMatches</a></div><div class="desc docblock-short">Container for parse results.</div></li><li><div class="item-name"><a class="struct" href="struct.Command.html" title="struct clap::Command">Command</a></div><div class="desc docblock-short">Build a command-line interface.</div></li><li><div class="item-name"><a class="struct" href="struct.Id.html" title="struct clap::Id">Id</a></div><div class="desc docblock-short"><a href="struct.Arg.html" title="struct clap::Arg"><code>Arg</code></a> or <a href="struct.ArgGroup.html" title="struct clap::ArgGroup"><code>ArgGroup</code></a> identifier</div></li></ul><h2 id="enums" class="section-header">Enums<a href="#enums" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="enum" href="enum.ArgAction.html" title="enum clap::ArgAction">ArgAction</a></div><div class="desc docblock-short">Behavior of arguments when they are encountered while parsing</div></li><li><div class="item-name"><a class="enum" href="enum.ColorChoice.html" title="enum clap::ColorChoice">ColorChoice</a></div><div class="desc docblock-short">Represents the color preferences for program output</div></li><li><div class="item-name"><a class="enum" href="enum.ValueHint.html" title="enum clap::ValueHint">ValueHint</a></div><div class="desc docblock-short">Provide shell with hint on how to complete an argument.</div></li></ul><h2 id="traits" class="section-header">Traits<a href="#traits" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="trait" href="trait.Args.html" title="trait clap::Args">Args</a></div><div class="desc docblock-short">Parse a set of arguments into a user-defined container.</div></li><li><div class="item-name"><a class="trait" href="trait.CommandFactory.html" title="trait clap::CommandFactory">CommandFactory</a></div><div class="desc docblock-short">Create a <a href="struct.Command.html" title="struct clap::Command"><code>Command</code></a> relevant for a user-defined container.</div></li><li><div class="item-name"><a class="trait" href="trait.FromArgMatches.html" title="trait clap::FromArgMatches">FromArgMatches</a></div><div class="desc docblock-short">Converts an instance of <a href="struct.ArgMatches.html" title="struct clap::ArgMatches"><code>ArgMatches</code></a> to a user-defined container.</div></li><li><div class="item-name"><a class="trait" href="trait.Parser.html" title="trait clap::Parser">Parser</a></div><div class="desc docblock-short">Parse command-line arguments into <code>Self</code>.</div></li><li><div class="item-name"><a class="trait" href="trait.Subcommand.html" title="trait clap::Subcommand">Subcommand</a></div><div class="desc docblock-short">Parse a sub-command into a user-defined enum.</div></li><li><div class="item-name"><a class="trait" href="trait.ValueEnum.html" title="trait clap::ValueEnum">ValueEnum</a></div><div class="desc docblock-short">Parse arguments into enums.</div></li></ul><h2 id="types" class="section-header">Type Aliases<a href="#types" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="type" href="type.Error.html" title="type clap::Error">Error</a></div><div class="desc docblock-short">Command Line Argument Parser Error</div></li></ul></section></div></main></body></html>
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