<!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="Source of the Rust file `/home/sangenya/.cargo/registry/src/github.com-1ecc6299db9ec823/getopts-0.2.21/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs - source</title><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="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><script src="../../crates.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="shortcut icon" href="https://www.rust-lang.org/favicon.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">☰</div><a href='../../getopts/index.html'><div class='logo-container'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img src="../../brush.svg" width="18" height="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><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" disabled 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 src="../../wheel.svg" width="18" height="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class="rust">
<span class="comment">// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="comment">//</span>
<span class="comment">// ignore-lexer-test FIXME #15677</span>
<span class="doccomment">//! Simple getopt alternative.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Construct a vector of options, either by using `reqopt`, `optopt`, and</span>
<span class="doccomment">//! `optflag` or by building them from components yourself, and pass them to</span>
<span class="doccomment">//! `getopts`, along with a vector of actual arguments (not including</span>
<span class="doccomment">//! `argv[0]`). You'll either get a failure code back, or a match. You'll have</span>
<span class="doccomment">//! to verify whether the amount of 'free' arguments in the match is what you</span>
<span class="doccomment">//! expect. Use `opt_*` accessors to get argument values out of the matches</span>
<span class="doccomment">//! object.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Single-character options are expected to appear on the command line with a</span>
<span class="doccomment">//! single preceding dash; multiple-character options are expected to be</span>
<span class="doccomment">//! proceeded by two dashes. Options that expect an argument accept their</span>
<span class="doccomment">//! argument following either a space or an equals sign. Single-character</span>
<span class="doccomment">//! options don't require the space.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Usage</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! This crate is [on crates.io](https://crates.io/crates/getopts) and can be</span>
<span class="doccomment">//! used by adding `getopts` to the dependencies in your project's `Cargo.toml`.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```toml</span>
<span class="doccomment">//! [dependencies]</span>
<span class="doccomment">//! getopts = "0.2"</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! and this to your crate root:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! extern crate getopts;</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Example</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The following example shows simple command line parsing for an application</span>
<span class="doccomment">//! that requires an input file to be specified, accepts an optional output file</span>
<span class="doccomment">//! name following `-o`, and accepts both `-h` and `--help` as optional flags.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```{.rust}</span>
<span class="doccomment">//! extern crate getopts;</span>
<span class="doccomment">//! use getopts::Options;</span>
<span class="doccomment">//! use std::env;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn do_work(inp: &str, out: Option<String>) {</span>
<span class="doccomment">//! println!("{}", inp);</span>
<span class="doccomment">//! match out {</span>
<span class="doccomment">//! Some(x) => println!("{}", x),</span>
<span class="doccomment">//! None => println!("No Output"),</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn print_usage(program: &str, opts: Options) {</span>
<span class="doccomment">//! let brief = format!("Usage: {} FILE [options]", program);</span>
<span class="doccomment">//! print!("{}", opts.usage(&brief));</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn main() {</span>
<span class="doccomment">//! let args: Vec<String> = env::args().collect();</span>
<span class="doccomment">//! let program = args[0].clone();</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! let mut opts = Options::new();</span>
<span class="doccomment">//! opts.optopt("o", "", "set output file name", "NAME");</span>
<span class="doccomment">//! opts.optflag("h", "help", "print this help menu");</span>
<span class="doccomment">//! let matches = match opts.parse(&args[1..]) {</span>
<span class="doccomment">//! Ok(m) => { m }</span>
<span class="doccomment">//! Err(f) => { panic!(f.to_string()) }</span>
<span class="doccomment">//! };</span>
<span class="doccomment">//! if matches.opt_present("h") {</span>
<span class="doccomment">//! print_usage(&program, opts);</span>
<span class="doccomment">//! return;</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! let output = matches.opt_str("o");</span>
<span class="doccomment">//! let input = if !matches.free.is_empty() {</span>
<span class="doccomment">//! matches.free[0].clone()</span>
<span class="doccomment">//! } else {</span>
<span class="doccomment">//! print_usage(&program, opts);</span>
<span class="doccomment">//! return;</span>
<span class="doccomment">//! };</span>
<span class="doccomment">//! do_work(&input, output);</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="attribute">#![<span class="ident">doc</span>(
<span class="ident">html_logo_url</span> <span class="op">=</span> <span class="string">"https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png"</span>,
<span class="ident">html_favicon_url</span> <span class="op">=</span> <span class="string">"https://www.rust-lang.org/favicon.ico"</span>,
<span class="ident">html_root_url</span> <span class="op">=</span> <span class="string">"https://docs.rs/getopts/0.2.20"</span>
)]</span>
<span class="attribute">#![<span class="ident">deny</span>(<span class="ident">missing_docs</span>)]</span>
<span class="attribute">#![<span class="ident">cfg_attr</span>(<span class="ident">test</span>, <span class="ident">deny</span>(<span class="ident">warnings</span>))]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">log</span>;
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">unicode_width</span>;
<span class="kw">use</span> <span class="self">self</span><span class="ident">::Fail</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="self">self</span><span class="ident">::HasArg</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="self">self</span><span class="ident">::Name</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="self">self</span><span class="ident">::Occur</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="self">self</span><span class="ident">::Optval</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">std::error::Error</span>;
<span class="kw">use</span> <span class="ident">std::ffi::OsStr</span>;
<span class="kw">use</span> <span class="ident">std::fmt</span>;
<span class="kw">use</span> <span class="ident">std::iter</span>::{<span class="ident">repeat</span>, <span class="ident">IntoIterator</span>};
<span class="kw">use</span> <span class="ident">std::result</span>;
<span class="kw">use</span> <span class="ident">std::str::FromStr</span>;
<span class="kw">use</span> <span class="ident">unicode_width::UnicodeWidthStr</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span>;
<span class="doccomment">/// A description of the options that a program can handle.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Options</span> {
<span class="ident">grps</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">OptGroup</span><span class="op">></span>,
<span class="ident">parsing_style</span>: <span class="ident">ParsingStyle</span>,
<span class="ident">long_only</span>: <span class="ident">bool</span>,
}
<span class="kw">impl</span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">Options</span> {
<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">Self</span><span class="ident">::new</span>()
}
}
<span class="kw">impl</span> <span class="ident">Options</span> {
<span class="doccomment">/// Create a blank set of options.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">></span> <span class="ident">Options</span> {
<span class="ident">Options</span> {
<span class="ident">grps</span>: <span class="ident">Vec::new</span>(),
<span class="ident">parsing_style</span>: <span class="ident">ParsingStyle::FloatingFrees</span>,
<span class="ident">long_only</span>: <span class="bool-val">false</span>,
}
}
<span class="doccomment">/// Set the parsing style.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parsing_style</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">style</span>: <span class="ident">ParsingStyle</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Options</span> {
<span class="self">self</span>.<span class="ident">parsing_style</span> <span class="op">=</span> <span class="ident">style</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set or clear "long options only" mode.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// In "long options only" mode, short options cannot be clustered</span>
<span class="doccomment">/// together, and long options can be given with either a single</span>
<span class="doccomment">/// "-" or the customary "--". This mode also changes the meaning</span>
<span class="doccomment">/// of "-a=b"; in the ordinary mode this will parse a short option</span>
<span class="doccomment">/// "-a" with argument "=b"; whereas in long-options-only mode the</span>
<span class="doccomment">/// argument will be simply "b".</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">long_only</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">long_only</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Options</span> {
<span class="self">self</span>.<span class="ident">long_only</span> <span class="op">=</span> <span class="ident">long_only</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Create a generic option group, stating all parameters explicitly.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">opt</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>,
<span class="ident">short_name</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">long_name</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">desc</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">hint</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">hasarg</span>: <span class="ident">HasArg</span>,
<span class="ident">occur</span>: <span class="ident">Occur</span>,
) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Options</span> {
<span class="ident">validate_names</span>(<span class="ident">short_name</span>, <span class="ident">long_name</span>);
<span class="self">self</span>.<span class="ident">grps</span>.<span class="ident">push</span>(<span class="ident">OptGroup</span> {
<span class="ident">short_name</span>: <span class="ident">short_name</span>.<span class="ident">to_string</span>(),
<span class="ident">long_name</span>: <span class="ident">long_name</span>.<span class="ident">to_string</span>(),
<span class="ident">hint</span>: <span class="ident">hint</span>.<span class="ident">to_string</span>(),
<span class="ident">desc</span>: <span class="ident">desc</span>.<span class="ident">to_string</span>(),
<span class="ident">hasarg</span>,
<span class="ident">occur</span>,
});
<span class="self">self</span>
}
<span class="doccomment">/// Create a long option that is optional and does not take an argument.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * `short_name` - e.g. `"h"` for a `-h` option, or `""` for none</span>
<span class="doccomment">/// * `long_name` - e.g. `"help"` for a `--help` option, or `""` for none</span>
<span class="doccomment">/// * `desc` - Description for usage help</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">optflag</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">short_name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">long_name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">desc</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Options</span> {
<span class="ident">validate_names</span>(<span class="ident">short_name</span>, <span class="ident">long_name</span>);
<span class="self">self</span>.<span class="ident">grps</span>.<span class="ident">push</span>(<span class="ident">OptGroup</span> {
<span class="ident">short_name</span>: <span class="ident">short_name</span>.<span class="ident">to_string</span>(),
<span class="ident">long_name</span>: <span class="ident">long_name</span>.<span class="ident">to_string</span>(),
<span class="ident">hint</span>: <span class="string">""</span>.<span class="ident">to_string</span>(),
<span class="ident">desc</span>: <span class="ident">desc</span>.<span class="ident">to_string</span>(),
<span class="ident">hasarg</span>: <span class="ident">No</span>,
<span class="ident">occur</span>: <span class="ident">Optional</span>,
});
<span class="self">self</span>
}
<span class="doccomment">/// Create a long option that can occur more than once and does not</span>
<span class="doccomment">/// take an argument.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * `short_name` - e.g. `"h"` for a `-h` option, or `""` for none</span>
<span class="doccomment">/// * `long_name` - e.g. `"help"` for a `--help` option, or `""` for none</span>
<span class="doccomment">/// * `desc` - Description for usage help</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">optflagmulti</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">short_name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">long_name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">desc</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Options</span> {
<span class="ident">validate_names</span>(<span class="ident">short_name</span>, <span class="ident">long_name</span>);
<span class="self">self</span>.<span class="ident">grps</span>.<span class="ident">push</span>(<span class="ident">OptGroup</span> {
<span class="ident">short_name</span>: <span class="ident">short_name</span>.<span class="ident">to_string</span>(),
<span class="ident">long_name</span>: <span class="ident">long_name</span>.<span class="ident">to_string</span>(),
<span class="ident">hint</span>: <span class="string">""</span>.<span class="ident">to_string</span>(),
<span class="ident">desc</span>: <span class="ident">desc</span>.<span class="ident">to_string</span>(),
<span class="ident">hasarg</span>: <span class="ident">No</span>,
<span class="ident">occur</span>: <span class="ident">Multi</span>,
});
<span class="self">self</span>
}
<span class="doccomment">/// Create a long option that is optional and takes an optional argument.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * `short_name` - e.g. `"h"` for a `-h` option, or `""` for none</span>
<span class="doccomment">/// * `long_name` - e.g. `"help"` for a `--help` option, or `""` for none</span>
<span class="doccomment">/// * `desc` - Description for usage help</span>
<span class="doccomment">/// * `hint` - Hint that is used in place of the argument in the usage help,</span>
<span class="doccomment">/// e.g. `"FILE"` for a `-o FILE` option</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">optflagopt</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>,
<span class="ident">short_name</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">long_name</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">desc</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">hint</span>: <span class="kw-2">&</span><span class="ident">str</span>,
) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Options</span> {
<span class="ident">validate_names</span>(<span class="ident">short_name</span>, <span class="ident">long_name</span>);
<span class="self">self</span>.<span class="ident">grps</span>.<span class="ident">push</span>(<span class="ident">OptGroup</span> {
<span class="ident">short_name</span>: <span class="ident">short_name</span>.<span class="ident">to_string</span>(),
<span class="ident">long_name</span>: <span class="ident">long_name</span>.<span class="ident">to_string</span>(),
<span class="ident">hint</span>: <span class="ident">hint</span>.<span class="ident">to_string</span>(),
<span class="ident">desc</span>: <span class="ident">desc</span>.<span class="ident">to_string</span>(),
<span class="ident">hasarg</span>: <span class="ident">Maybe</span>,
<span class="ident">occur</span>: <span class="ident">Optional</span>,
});
<span class="self">self</span>
}
<span class="doccomment">/// Create a long option that is optional, takes an argument, and may occur</span>
<span class="doccomment">/// multiple times.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * `short_name` - e.g. `"h"` for a `-h` option, or `""` for none</span>
<span class="doccomment">/// * `long_name` - e.g. `"help"` for a `--help` option, or `""` for none</span>
<span class="doccomment">/// * `desc` - Description for usage help</span>
<span class="doccomment">/// * `hint` - Hint that is used in place of the argument in the usage help,</span>
<span class="doccomment">/// e.g. `"FILE"` for a `-o FILE` option</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">optmulti</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>,
<span class="ident">short_name</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">long_name</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">desc</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">hint</span>: <span class="kw-2">&</span><span class="ident">str</span>,
) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Options</span> {
<span class="ident">validate_names</span>(<span class="ident">short_name</span>, <span class="ident">long_name</span>);
<span class="self">self</span>.<span class="ident">grps</span>.<span class="ident">push</span>(<span class="ident">OptGroup</span> {
<span class="ident">short_name</span>: <span class="ident">short_name</span>.<span class="ident">to_string</span>(),
<span class="ident">long_name</span>: <span class="ident">long_name</span>.<span class="ident">to_string</span>(),
<span class="ident">hint</span>: <span class="ident">hint</span>.<span class="ident">to_string</span>(),
<span class="ident">desc</span>: <span class="ident">desc</span>.<span class="ident">to_string</span>(),
<span class="ident">hasarg</span>: <span class="ident">Yes</span>,
<span class="ident">occur</span>: <span class="ident">Multi</span>,
});
<span class="self">self</span>
}
<span class="doccomment">/// Create a long option that is optional and takes an argument.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * `short_name` - e.g. `"h"` for a `-h` option, or `""` for none</span>
<span class="doccomment">/// * `long_name` - e.g. `"help"` for a `--help` option, or `""` for none</span>
<span class="doccomment">/// * `desc` - Description for usage help</span>
<span class="doccomment">/// * `hint` - Hint that is used in place of the argument in the usage help,</span>
<span class="doccomment">/// e.g. `"FILE"` for a `-o FILE` option</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">optopt</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>,
<span class="ident">short_name</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">long_name</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">desc</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">hint</span>: <span class="kw-2">&</span><span class="ident">str</span>,
) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Options</span> {
<span class="ident">validate_names</span>(<span class="ident">short_name</span>, <span class="ident">long_name</span>);
<span class="self">self</span>.<span class="ident">grps</span>.<span class="ident">push</span>(<span class="ident">OptGroup</span> {
<span class="ident">short_name</span>: <span class="ident">short_name</span>.<span class="ident">to_string</span>(),
<span class="ident">long_name</span>: <span class="ident">long_name</span>.<span class="ident">to_string</span>(),
<span class="ident">hint</span>: <span class="ident">hint</span>.<span class="ident">to_string</span>(),
<span class="ident">desc</span>: <span class="ident">desc</span>.<span class="ident">to_string</span>(),
<span class="ident">hasarg</span>: <span class="ident">Yes</span>,
<span class="ident">occur</span>: <span class="ident">Optional</span>,
});
<span class="self">self</span>
}
<span class="doccomment">/// Create a long option that is required and takes an argument.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * `short_name` - e.g. `"h"` for a `-h` option, or `""` for none</span>
<span class="doccomment">/// * `long_name` - e.g. `"help"` for a `--help` option, or `""` for none</span>
<span class="doccomment">/// * `desc` - Description for usage help</span>
<span class="doccomment">/// * `hint` - Hint that is used in place of the argument in the usage help,</span>
<span class="doccomment">/// e.g. `"FILE"` for a `-o FILE` option</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">reqopt</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>,
<span class="ident">short_name</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">long_name</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">desc</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">hint</span>: <span class="kw-2">&</span><span class="ident">str</span>,
) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Options</span> {
<span class="ident">validate_names</span>(<span class="ident">short_name</span>, <span class="ident">long_name</span>);
<span class="self">self</span>.<span class="ident">grps</span>.<span class="ident">push</span>(<span class="ident">OptGroup</span> {
<span class="ident">short_name</span>: <span class="ident">short_name</span>.<span class="ident">to_string</span>(),
<span class="ident">long_name</span>: <span class="ident">long_name</span>.<span class="ident">to_string</span>(),
<span class="ident">hint</span>: <span class="ident">hint</span>.<span class="ident">to_string</span>(),
<span class="ident">desc</span>: <span class="ident">desc</span>.<span class="ident">to_string</span>(),
<span class="ident">hasarg</span>: <span class="ident">Yes</span>,
<span class="ident">occur</span>: <span class="ident">Req</span>,
});
<span class="self">self</span>
}
<span class="doccomment">/// Parse command line arguments according to the provided options.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// On success returns `Ok(Matches)`. Use methods such as `opt_present`</span>
<span class="doccomment">/// `opt_str`, etc. to interrogate results.</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returns `Err(Fail)` on failure: use the `Debug` implementation of `Fail`</span>
<span class="doccomment">/// to display information about it.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse</span><span class="op"><</span><span class="ident">C</span>: <span class="ident">IntoIterator</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">args</span>: <span class="ident">C</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span>
<span class="kw">where</span>
<span class="ident">C::Item</span>: <span class="ident">AsRef</span><span class="op"><</span><span class="ident">OsStr</span><span class="op">></span>,
{
<span class="kw">let</span> <span class="ident">opts</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Opt</span><span class="op">></span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">grps</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span>.<span class="ident">long_to_short</span>()).<span class="ident">collect</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">vals</span> <span class="op">=</span> (<span class="number">0</span>..<span class="ident">opts</span>.<span class="ident">len</span>())
.<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">Vec::new</span>())
.<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span>(<span class="ident">usize</span>, <span class="ident">Optval</span>)<span class="op">></span><span class="op">></span><span class="op">></span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">free</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">String</span><span class="op">></span> <span class="op">=</span> <span class="ident">Vec::new</span>();
<span class="kw">let</span> <span class="ident">args</span> <span class="op">=</span> <span class="ident">args</span>
.<span class="ident">into_iter</span>()
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> {
<span class="ident">i</span>.<span class="ident">as_ref</span>()
.<span class="ident">to_str</span>()
.<span class="ident">ok_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">Fail::UnrecognizedOption</span>(<span class="macro">format!</span>(<span class="string">"{:?}"</span>, <span class="ident">i</span>.<span class="ident">as_ref</span>())))
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">to_owned</span>())
})
.<span class="ident">collect</span>::<span class="op"><</span><span class="ident">::std::result::Result</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span>, <span class="kw">_</span><span class="op">></span><span class="op">></span>()<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">args</span> <span class="op">=</span> <span class="ident">args</span>.<span class="ident">into_iter</span>().<span class="ident">peekable</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">arg_pos</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">cur</span>) <span class="op">=</span> <span class="ident">args</span>.<span class="ident">next</span>() {
<span class="kw">if</span> <span class="op">!</span><span class="ident">is_arg</span>(<span class="kw-2">&</span><span class="ident">cur</span>) {
<span class="ident">free</span>.<span class="ident">push</span>(<span class="ident">cur</span>);
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">parsing_style</span> {
<span class="ident">ParsingStyle::FloatingFrees</span> <span class="op">=</span><span class="op">></span> {}
<span class="ident">ParsingStyle::StopAtFirstFree</span> <span class="op">=</span><span class="op">></span> {
<span class="ident">free</span>.<span class="ident">extend</span>(<span class="ident">args</span>);
<span class="kw">break</span>;
}
}
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">cur</span> <span class="op">=</span><span class="op">=</span> <span class="string">"--"</span> {
<span class="ident">free</span>.<span class="ident">extend</span>(<span class="ident">args</span>);
<span class="kw">break</span>;
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">names</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i_arg</span> <span class="op">=</span> <span class="prelude-val">None</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">was_long</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="kw">if</span> <span class="ident">cur</span>.<span class="ident">as_bytes</span>()[<span class="number">1</span>] <span class="op">=</span><span class="op">=</span> <span class="string">b'-'</span> <span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">long_only</span> {
<span class="kw">let</span> <span class="ident">tail</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">cur</span>.<span class="ident">as_bytes</span>()[<span class="number">1</span>] <span class="op">=</span><span class="op">=</span> <span class="string">b'-'</span> {
<span class="kw-2">&</span><span class="ident">cur</span>[<span class="number">2</span>..]
} <span class="kw">else</span> {
<span class="macro">assert!</span>(<span class="self">self</span>.<span class="ident">long_only</span>);
<span class="kw-2">&</span><span class="ident">cur</span>[<span class="number">1</span>..]
};
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">parts</span> <span class="op">=</span> <span class="ident">tail</span>.<span class="ident">splitn</span>(<span class="number">2</span>, <span class="string">'='</span>);
<span class="ident">names</span> <span class="op">=</span> <span class="macro">vec!</span>[<span class="ident">Name::from_str</span>(<span class="ident">parts</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>())];
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">rest</span>) <span class="op">=</span> <span class="ident">parts</span>.<span class="ident">next</span>() {
<span class="ident">i_arg</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">rest</span>.<span class="ident">to_string</span>());
}
} <span class="kw">else</span> {
<span class="ident">was_long</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="ident">names</span> <span class="op">=</span> <span class="ident">Vec::new</span>();
<span class="kw">for</span> (<span class="ident">j</span>, <span class="ident">ch</span>) <span class="kw">in</span> <span class="ident">cur</span>.<span class="ident">char_indices</span>().<span class="ident">skip</span>(<span class="number">1</span>) {
<span class="kw">let</span> <span class="ident">opt</span> <span class="op">=</span> <span class="ident">Short</span>(<span class="ident">ch</span>);
<span class="comment">/* In a series of potential options (eg. -aheJ), if we
see one which takes an argument, we assume all
subsequent characters make up the argument. This
allows options such as -L/usr/local/lib/foo to be
interpreted correctly
*/</span>
<span class="kw">let</span> <span class="ident">opt_id</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">find_opt</span>(<span class="kw-2">&</span><span class="ident">opts</span>, <span class="kw-2">&</span><span class="ident">opt</span>) {
<span class="prelude-val">Some</span>(<span class="ident">id</span>) <span class="op">=</span><span class="op">></span> <span class="ident">id</span>,
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">UnrecognizedOption</span>(<span class="ident">opt</span>.<span class="ident">to_string</span>())),
};
<span class="ident">names</span>.<span class="ident">push</span>(<span class="ident">opt</span>);
<span class="kw">let</span> <span class="ident">arg_follows</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">opts</span>[<span class="ident">opt_id</span>].<span class="ident">hasarg</span> {
<span class="ident">Yes</span> <span class="op">|</span> <span class="ident">Maybe</span> <span class="op">=</span><span class="op">></span> <span class="bool-val">true</span>,
<span class="ident">No</span> <span class="op">=</span><span class="op">></span> <span class="bool-val">false</span>,
};
<span class="kw">if</span> <span class="ident">arg_follows</span> {
<span class="kw">let</span> <span class="ident">next</span> <span class="op">=</span> <span class="ident">j</span> <span class="op">+</span> <span class="ident">ch</span>.<span class="ident">len_utf8</span>();
<span class="kw">if</span> <span class="ident">next</span> <span class="op"><</span> <span class="ident">cur</span>.<span class="ident">len</span>() {
<span class="ident">i_arg</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">cur</span>[<span class="ident">next</span>..].<span class="ident">to_string</span>());
<span class="kw">break</span>;
}
}
}
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">name_pos</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">for</span> <span class="ident">nm</span> <span class="kw">in</span> <span class="ident">names</span>.<span class="ident">iter</span>() {
<span class="ident">name_pos</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
<span class="kw">let</span> <span class="ident">optid</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">find_opt</span>(<span class="kw-2">&</span><span class="ident">opts</span>, <span class="kw-2">&</span><span class="ident">nm</span>) {
<span class="prelude-val">Some</span>(<span class="ident">id</span>) <span class="op">=</span><span class="op">></span> <span class="ident">id</span>,
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">UnrecognizedOption</span>(<span class="ident">nm</span>.<span class="ident">to_string</span>())),
};
<span class="kw">match</span> <span class="ident">opts</span>[<span class="ident">optid</span>].<span class="ident">hasarg</span> {
<span class="ident">No</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">name_pos</span> <span class="op">=</span><span class="op">=</span> <span class="ident">names</span>.<span class="ident">len</span>() <span class="op">&&</span> <span class="ident">i_arg</span>.<span class="ident">is_some</span>() {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">UnexpectedArgument</span>(<span class="ident">nm</span>.<span class="ident">to_string</span>()));
}
<span class="ident">vals</span>[<span class="ident">optid</span>].<span class="ident">push</span>((<span class="ident">arg_pos</span>, <span class="ident">Given</span>));
}
<span class="ident">Maybe</span> <span class="op">=</span><span class="op">></span> {
<span class="comment">// Note that here we do not handle `--arg value`.</span>
<span class="comment">// This matches GNU getopt behavior; but also</span>
<span class="comment">// makes sense, because if this were accepted,</span>
<span class="comment">// then users could only write a "Maybe" long</span>
<span class="comment">// option at the end of the arguments when</span>
<span class="comment">// FloatingFrees is in use.</span>
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">i_arg</span>) <span class="op">=</span> <span class="ident">i_arg</span>.<span class="ident">take</span>() {
<span class="ident">vals</span>[<span class="ident">optid</span>].<span class="ident">push</span>((<span class="ident">arg_pos</span>, <span class="ident">Val</span>(<span class="ident">i_arg</span>)));
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">was_long</span>
<span class="op">|</span><span class="op">|</span> <span class="ident">name_pos</span> <span class="op"><</span> <span class="ident">names</span>.<span class="ident">len</span>()
<span class="op">|</span><span class="op">|</span> <span class="ident">args</span>.<span class="ident">peek</span>().<span class="ident">map_or</span>(<span class="bool-val">true</span>, <span class="op">|</span><span class="ident">n</span><span class="op">|</span> <span class="ident">is_arg</span>(<span class="kw-2">&</span><span class="ident">n</span>))
{
<span class="ident">vals</span>[<span class="ident">optid</span>].<span class="ident">push</span>((<span class="ident">arg_pos</span>, <span class="ident">Given</span>));
} <span class="kw">else</span> {
<span class="ident">vals</span>[<span class="ident">optid</span>].<span class="ident">push</span>((<span class="ident">arg_pos</span>, <span class="ident">Val</span>(<span class="ident">args</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>())));
}
}
<span class="ident">Yes</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">i_arg</span>) <span class="op">=</span> <span class="ident">i_arg</span>.<span class="ident">take</span>() {
<span class="ident">vals</span>[<span class="ident">optid</span>].<span class="ident">push</span>((<span class="ident">arg_pos</span>, <span class="ident">Val</span>(<span class="ident">i_arg</span>)));
} <span class="kw">else</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">n</span>) <span class="op">=</span> <span class="ident">args</span>.<span class="ident">next</span>() {
<span class="ident">vals</span>[<span class="ident">optid</span>].<span class="ident">push</span>((<span class="ident">arg_pos</span>, <span class="ident">Val</span>(<span class="ident">n</span>)));
} <span class="kw">else</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ArgumentMissing</span>(<span class="ident">nm</span>.<span class="ident">to_string</span>()));
}
}
}
}
}
<span class="ident">arg_pos</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
}
<span class="macro">debug_assert_eq!</span>(<span class="ident">vals</span>.<span class="ident">len</span>(), <span class="ident">opts</span>.<span class="ident">len</span>());
<span class="kw">for</span> (<span class="ident">vals</span>, <span class="ident">opt</span>) <span class="kw">in</span> <span class="ident">vals</span>.<span class="ident">iter</span>().<span class="ident">zip</span>(<span class="ident">opts</span>.<span class="ident">iter</span>()) {
<span class="kw">if</span> <span class="ident">opt</span>.<span class="ident">occur</span> <span class="op">=</span><span class="op">=</span> <span class="ident">Req</span> <span class="op">&&</span> <span class="ident">vals</span>.<span class="ident">is_empty</span>() {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">OptionMissing</span>(<span class="ident">opt</span>.<span class="ident">name</span>.<span class="ident">to_string</span>()));
}
<span class="kw">if</span> <span class="ident">opt</span>.<span class="ident">occur</span> <span class="op">!</span><span class="op">=</span> <span class="ident">Multi</span> <span class="op">&&</span> <span class="ident">vals</span>.<span class="ident">len</span>() <span class="op">></span> <span class="number">1</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">OptionDuplicated</span>(<span class="ident">opt</span>.<span class="ident">name</span>.<span class="ident">to_string</span>()));
}
}
<span class="prelude-val">Ok</span>(<span class="ident">Matches</span> { <span class="ident">opts</span>, <span class="ident">vals</span>, <span class="ident">free</span> })
}
<span class="doccomment">/// Derive a short one-line usage summary from a set of long options.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">short_usage</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">program_name</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">String</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">line</span> <span class="op">=</span> <span class="macro">format!</span>(<span class="string">"Usage: {} "</span>, <span class="ident">program_name</span>);
<span class="ident">line</span>.<span class="ident">push_str</span>(
<span class="kw-2">&</span><span class="self">self</span>
.<span class="ident">grps</span>
.<span class="ident">iter</span>()
.<span class="ident">map</span>(<span class="ident">format_option</span>)
.<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">String</span><span class="op">></span><span class="op">></span>()
.<span class="ident">join</span>(<span class="string">" "</span>),
);
<span class="ident">line</span>
}
<span class="doccomment">/// Derive a formatted message from a set of options.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">usage</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">brief</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">String</span> {
<span class="self">self</span>.<span class="ident">usage_with_format</span>(<span class="op">|</span><span class="ident">opts</span><span class="op">|</span> {
<span class="macro">format!</span>(
<span class="string">"{}\n\nOptions:\n{}\n"</span>,
<span class="ident">brief</span>,
<span class="ident">opts</span>.<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">String</span><span class="op">></span><span class="op">></span>().<span class="ident">join</span>(<span class="string">"\n"</span>)
)
})
}
<span class="doccomment">/// Derive a custom formatted message from a set of options. The formatted options provided to</span>
<span class="doccomment">/// a closure as an iterator.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">usage_with_format</span><span class="op"><</span><span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">dyn</span> <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">String</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="ident">String</span><span class="op">></span>(
<span class="kw-2">&</span><span class="self">self</span>,
<span class="kw-2">mut</span> <span class="ident">formatter</span>: <span class="ident">F</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">String</span> {
<span class="ident">formatter</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">usage_items</span>())
}
<span class="doccomment">/// Derive usage items from a set of options.</span>
<span class="kw">fn</span> <span class="ident">usage_items</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Box</span><span class="op"><</span><span class="ident">dyn</span> <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">String</span><span class="op">></span> <span class="op">+</span> <span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">desc_sep</span> <span class="op">=</span> <span class="macro">format!</span>(<span class="string">"\n{}"</span>, <span class="ident">repeat</span>(<span class="string">" "</span>).<span class="ident">take</span>(<span class="number">24</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">String</span><span class="op">></span>());
<span class="kw">let</span> <span class="ident">any_short</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">grps</span>.<span class="ident">iter</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">optref</span><span class="op">|</span> <span class="op">!</span><span class="ident">optref</span>.<span class="ident">short_name</span>.<span class="ident">is_empty</span>());
<span class="kw">let</span> <span class="ident">rows</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">grps</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="kw">move</span> <span class="op">|</span><span class="ident">optref</span><span class="op">|</span> {
<span class="kw">let</span> <span class="ident">OptGroup</span> {
<span class="ident">short_name</span>,
<span class="ident">long_name</span>,
<span class="ident">hint</span>,
<span class="ident">desc</span>,
<span class="ident">hasarg</span>,
..
} <span class="op">=</span> (<span class="kw-2">*</span><span class="ident">optref</span>).<span class="ident">clone</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">row</span> <span class="op">=</span> <span class="string">" "</span>.<span class="ident">to_string</span>();
<span class="comment">// short option</span>
<span class="kw">match</span> <span class="ident">short_name</span>.<span class="ident">width</span>() {
<span class="number">0</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">any_short</span> {
<span class="ident">row</span>.<span class="ident">push_str</span>(<span class="string">" "</span>);
}
}
<span class="number">1</span> <span class="op">=</span><span class="op">></span> {
<span class="ident">row</span>.<span class="ident">push</span>(<span class="string">'-'</span>);
<span class="ident">row</span>.<span class="ident">push_str</span>(<span class="kw-2">&</span><span class="ident">short_name</span>);
<span class="kw">if</span> <span class="ident">long_name</span>.<span class="ident">width</span>() <span class="op">></span> <span class="number">0</span> {
<span class="ident">row</span>.<span class="ident">push_str</span>(<span class="string">", "</span>);
} <span class="kw">else</span> {
<span class="comment">// Only a single space here, so that any</span>
<span class="comment">// argument is printed in the correct spot.</span>
<span class="ident">row</span>.<span class="ident">push</span>(<span class="string">' '</span>);
}
}
<span class="comment">// FIXME: refer issue #7.</span>
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">panic!</span>(<span class="string">"the short name should only be 1 ascii char long"</span>),
}
<span class="comment">// long option</span>
<span class="kw">match</span> <span class="ident">long_name</span>.<span class="ident">width</span>() {
<span class="number">0</span> <span class="op">=</span><span class="op">></span> {}
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> {
<span class="ident">row</span>.<span class="ident">push_str</span>(<span class="kw">if</span> <span class="self">self</span>.<span class="ident">long_only</span> { <span class="string">"-"</span> } <span class="kw">else</span> { <span class="string">"--"</span> });
<span class="ident">row</span>.<span class="ident">push_str</span>(<span class="kw-2">&</span><span class="ident">long_name</span>);
<span class="ident">row</span>.<span class="ident">push</span>(<span class="string">' '</span>);
}
}
<span class="comment">// arg</span>
<span class="kw">match</span> <span class="ident">hasarg</span> {
<span class="ident">No</span> <span class="op">=</span><span class="op">></span> {}
<span class="ident">Yes</span> <span class="op">=</span><span class="op">></span> <span class="ident">row</span>.<span class="ident">push_str</span>(<span class="kw-2">&</span><span class="ident">hint</span>),
<span class="ident">Maybe</span> <span class="op">=</span><span class="op">></span> {
<span class="ident">row</span>.<span class="ident">push</span>(<span class="string">'['</span>);
<span class="ident">row</span>.<span class="ident">push_str</span>(<span class="kw-2">&</span><span class="ident">hint</span>);
<span class="ident">row</span>.<span class="ident">push</span>(<span class="string">']'</span>);
}
}
<span class="kw">let</span> <span class="ident">rowlen</span> <span class="op">=</span> <span class="ident">row</span>.<span class="ident">width</span>();
<span class="kw">if</span> <span class="ident">rowlen</span> <span class="op"><</span> <span class="number">24</span> {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">24</span> <span class="op">-</span> <span class="ident">rowlen</span> {
<span class="ident">row</span>.<span class="ident">push</span>(<span class="string">' '</span>);
}
} <span class="kw">else</span> {
<span class="ident">row</span>.<span class="ident">push_str</span>(<span class="kw-2">&</span><span class="ident">desc_sep</span>)
}
<span class="kw">let</span> <span class="ident">desc_rows</span> <span class="op">=</span> <span class="ident">each_split_within</span>(<span class="kw-2">&</span><span class="ident">desc</span>, <span class="number">54</span>);
<span class="ident">row</span>.<span class="ident">push_str</span>(<span class="kw-2">&</span><span class="ident">desc_rows</span>.<span class="ident">join</span>(<span class="kw-2">&</span><span class="ident">desc_sep</span>));
<span class="ident">row</span>
});
<span class="ident">Box::new</span>(<span class="ident">rows</span>)
}
}
<span class="kw">fn</span> <span class="ident">validate_names</span>(<span class="ident">short_name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">long_name</span>: <span class="kw-2">&</span><span class="ident">str</span>) {
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">short_name</span>.<span class="ident">len</span>();
<span class="macro">assert!</span>(
<span class="ident">len</span> <span class="op">=</span><span class="op">=</span> <span class="number">1</span> <span class="op">|</span><span class="op">|</span> <span class="ident">len</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span>,
<span class="string">"the short_name (first argument) should be a single character, \
or an empty string for none"</span>
);
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">long_name</span>.<span class="ident">len</span>();
<span class="macro">assert!</span>(
<span class="ident">len</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> <span class="op">|</span><span class="op">|</span> <span class="ident">len</span> <span class="op">></span> <span class="number">1</span>,
<span class="string">"the long_name (second argument) should be longer than a single \
character, or an empty string for none"</span>
);
}
<span class="doccomment">/// What parsing style to use when parsing arguments.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">ParsingStyle</span> {
<span class="doccomment">/// Flags and "free" arguments can be freely inter-mixed.</span>
<span class="ident">FloatingFrees</span>,
<span class="doccomment">/// As soon as a "free" argument (i.e. non-flag) is encountered, stop</span>
<span class="doccomment">/// considering any remaining arguments as flags.</span>
<span class="ident">StopAtFirstFree</span>,
}
<span class="doccomment">/// Name of an option. Either a string or a single char.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
<span class="kw">enum</span> <span class="ident">Name</span> {
<span class="doccomment">/// A string representing the long name of an option.</span>
<span class="doccomment">/// For example: "help"</span>
<span class="ident">Long</span>(<span class="ident">String</span>),
<span class="doccomment">/// A char representing the short name of an option.</span>
<span class="doccomment">/// For example: 'h'</span>
<span class="ident">Short</span>(<span class="ident">char</span>),
}
<span class="doccomment">/// Describes whether an option has an argument.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>, <span class="ident">Copy</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">HasArg</span> {
<span class="doccomment">/// The option requires an argument.</span>
<span class="ident">Yes</span>,
<span class="doccomment">/// The option takes no argument.</span>
<span class="ident">No</span>,
<span class="doccomment">/// The option argument is optional.</span>
<span class="ident">Maybe</span>,
}
<span class="doccomment">/// Describes how often an option may occur.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>, <span class="ident">Copy</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Occur</span> {
<span class="doccomment">/// The option occurs once.</span>
<span class="ident">Req</span>,
<span class="doccomment">/// The option occurs at most once.</span>
<span class="ident">Optional</span>,
<span class="doccomment">/// The option occurs zero or more times.</span>
<span class="ident">Multi</span>,
}
<span class="doccomment">/// A description of a possible option.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
<span class="kw">struct</span> <span class="ident">Opt</span> {
<span class="doccomment">/// Name of the option</span>
<span class="ident">name</span>: <span class="ident">Name</span>,
<span class="doccomment">/// Whether it has an argument</span>
<span class="ident">hasarg</span>: <span class="ident">HasArg</span>,
<span class="doccomment">/// How often it can occur</span>
<span class="ident">occur</span>: <span class="ident">Occur</span>,
<span class="doccomment">/// Which options it aliases</span>
<span class="ident">aliases</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Opt</span><span class="op">></span>,
}
<span class="doccomment">/// One group of options, e.g., both `-h` and `--help`, along with</span>
<span class="doccomment">/// their shared description and properties.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
<span class="kw">struct</span> <span class="ident">OptGroup</span> {
<span class="doccomment">/// Short name of the option, e.g. `h` for a `-h` option</span>
<span class="ident">short_name</span>: <span class="ident">String</span>,
<span class="doccomment">/// Long name of the option, e.g. `help` for a `--help` option</span>
<span class="ident">long_name</span>: <span class="ident">String</span>,
<span class="doccomment">/// Hint for argument, e.g. `FILE` for a `-o FILE` option</span>
<span class="ident">hint</span>: <span class="ident">String</span>,
<span class="doccomment">/// Description for usage help text</span>
<span class="ident">desc</span>: <span class="ident">String</span>,
<span class="doccomment">/// Whether option has an argument</span>
<span class="ident">hasarg</span>: <span class="ident">HasArg</span>,
<span class="doccomment">/// How often it can occur</span>
<span class="ident">occur</span>: <span class="ident">Occur</span>,
}
<span class="doccomment">/// Describes whether an option is given at all or has a value.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
<span class="kw">enum</span> <span class="ident">Optval</span> {
<span class="ident">Val</span>(<span class="ident">String</span>),
<span class="ident">Given</span>,
}
<span class="doccomment">/// The result of checking command line arguments. Contains a vector</span>
<span class="doccomment">/// of matches and a vector of free strings.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Matches</span> {
<span class="doccomment">/// Options that matched</span>
<span class="ident">opts</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Opt</span><span class="op">></span>,
<span class="doccomment">/// Values of the Options that matched and their positions</span>
<span class="ident">vals</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span>(<span class="ident">usize</span>, <span class="ident">Optval</span>)<span class="op">></span><span class="op">></span>,
<span class="doccomment">/// Free string fragments</span>
<span class="kw">pub</span> <span class="ident">free</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>,
}
<span class="doccomment">/// The type returned when the command line does not conform to the</span>
<span class="doccomment">/// expected format. Use the `Debug` implementation to output detailed</span>
<span class="doccomment">/// information.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Fail</span> {
<span class="doccomment">/// The option requires an argument but none was passed.</span>
<span class="ident">ArgumentMissing</span>(<span class="ident">String</span>),
<span class="doccomment">/// The passed option is not declared among the possible options.</span>
<span class="ident">UnrecognizedOption</span>(<span class="ident">String</span>),
<span class="doccomment">/// A required option is not present.</span>
<span class="ident">OptionMissing</span>(<span class="ident">String</span>),
<span class="doccomment">/// A single occurrence option is being used multiple times.</span>
<span class="ident">OptionDuplicated</span>(<span class="ident">String</span>),
<span class="doccomment">/// There's an argument being passed to a non-argument option.</span>
<span class="ident">UnexpectedArgument</span>(<span class="ident">String</span>),
}
<span class="kw">impl</span> <span class="ident">Error</span> <span class="kw">for</span> <span class="ident">Fail</span> {
<span class="kw">fn</span> <span class="ident">description</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">str</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">ArgumentMissing</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="string">"missing argument"</span>,
<span class="ident">UnrecognizedOption</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="string">"unrecognized option"</span>,
<span class="ident">OptionMissing</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="string">"missing option"</span>,
<span class="ident">OptionDuplicated</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="string">"duplicated option"</span>,
<span class="ident">UnexpectedArgument</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="string">"unexpected argument"</span>,
}
}
}
<span class="doccomment">/// The result of parsing a command line with a set of options.</span>
<span class="kw">pub</span> <span class="kw">type</span> <span class="prelude-ty">Result</span> <span class="op">=</span> <span class="ident">result::Result</span><span class="op"><</span><span class="ident">Matches</span>, <span class="ident">Fail</span><span class="op">></span>;
<span class="kw">impl</span> <span class="ident">Name</span> {
<span class="kw">fn</span> <span class="ident">from_str</span>(<span class="ident">nm</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Name</span> {
<span class="kw">if</span> <span class="ident">nm</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">1</span> {
<span class="ident">Short</span>(<span class="ident">nm</span>.<span class="ident">as_bytes</span>()[<span class="number">0</span>] <span class="kw">as</span> <span class="ident">char</span>)
} <span class="kw">else</span> {
<span class="ident">Long</span>(<span class="ident">nm</span>.<span class="ident">to_string</span>())
}
}
<span class="kw">fn</span> <span class="ident">to_string</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">String</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">Short</span>(<span class="ident">ch</span>) <span class="op">=</span><span class="op">></span> <span class="ident">ch</span>.<span class="ident">to_string</span>(),
<span class="ident">Long</span>(<span class="kw-2">ref</span> <span class="ident">s</span>) <span class="op">=</span><span class="op">></span> <span class="ident">s</span>.<span class="ident">to_string</span>(),
}
}
}
<span class="kw">impl</span> <span class="ident">OptGroup</span> {
<span class="doccomment">/// Translate OptGroup into Opt.</span>
<span class="doccomment">/// (Both short and long names correspond to different Opts).</span>
<span class="kw">fn</span> <span class="ident">long_to_short</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Opt</span> {
<span class="kw">let</span> <span class="ident">OptGroup</span> {
<span class="ident">short_name</span>,
<span class="ident">long_name</span>,
<span class="ident">hasarg</span>,
<span class="ident">occur</span>,
..
} <span class="op">=</span> (<span class="kw-2">*</span><span class="self">self</span>).<span class="ident">clone</span>();
<span class="kw">match</span> (<span class="ident">short_name</span>.<span class="ident">len</span>(), <span class="ident">long_name</span>.<span class="ident">len</span>()) {
(<span class="number">0</span>, <span class="number">0</span>) <span class="op">=</span><span class="op">></span> <span class="macro">panic!</span>(<span class="string">"this long-format option was given no name"</span>),
(<span class="number">0</span>, <span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="ident">Opt</span> {
<span class="ident">name</span>: <span class="ident">Long</span>(<span class="ident">long_name</span>),
<span class="ident">hasarg</span>,
<span class="ident">occur</span>,
<span class="ident">aliases</span>: <span class="ident">Vec::new</span>(),
},
(<span class="number">1</span>, <span class="number">0</span>) <span class="op">=</span><span class="op">></span> <span class="ident">Opt</span> {
<span class="ident">name</span>: <span class="ident">Short</span>(<span class="ident">short_name</span>.<span class="ident">as_bytes</span>()[<span class="number">0</span>] <span class="kw">as</span> <span class="ident">char</span>),
<span class="ident">hasarg</span>,
<span class="ident">occur</span>,
<span class="ident">aliases</span>: <span class="ident">Vec::new</span>(),
},
(<span class="number">1</span>, <span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="ident">Opt</span> {
<span class="ident">name</span>: <span class="ident">Long</span>(<span class="ident">long_name</span>),
<span class="ident">hasarg</span>,
<span class="ident">occur</span>,
<span class="ident">aliases</span>: <span class="macro">vec!</span>[<span class="ident">Opt</span> {
<span class="ident">name</span>: <span class="ident">Short</span>(<span class="ident">short_name</span>.<span class="ident">as_bytes</span>()[<span class="number">0</span>] <span class="kw">as</span> <span class="ident">char</span>),
<span class="ident">hasarg</span>: <span class="ident">hasarg</span>,
<span class="ident">occur</span>: <span class="ident">occur</span>,
<span class="ident">aliases</span>: <span class="ident">Vec::new</span>(),
}],
},
(<span class="kw">_</span>, <span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="macro">panic!</span>(<span class="string">"something is wrong with the long-form opt"</span>),
}
}
}
<span class="kw">impl</span> <span class="ident">Matches</span> {
<span class="kw">fn</span> <span class="ident">opt_vals</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">nm</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span>(<span class="ident">usize</span>, <span class="ident">Optval</span>)<span class="op">></span> {
<span class="kw">match</span> <span class="ident">find_opt</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">opts</span>, <span class="kw-2">&</span><span class="ident">Name::from_str</span>(<span class="ident">nm</span>)) {
<span class="prelude-val">Some</span>(<span class="ident">id</span>) <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">vals</span>[<span class="ident">id</span>].<span class="ident">clone</span>(),
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="macro">panic!</span>(<span class="string">"No option '{}' defined"</span>, <span class="ident">nm</span>),
}
}
<span class="kw">fn</span> <span class="ident">opt_val</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">nm</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Optval</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">opt_vals</span>(<span class="ident">nm</span>).<span class="ident">into_iter</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="kw">_</span>, <span class="ident">o</span>)<span class="op">|</span> <span class="ident">o</span>).<span class="ident">next</span>()
}
<span class="doccomment">/// Returns true if an option was defined</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">opt_defined</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">nm</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="ident">find_opt</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">opts</span>, <span class="kw-2">&</span><span class="ident">Name::from_str</span>(<span class="ident">nm</span>)).<span class="ident">is_some</span>()
}
<span class="doccomment">/// Returns true if an option was matched.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">opt_present</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">nm</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="op">!</span><span class="self">self</span>.<span class="ident">opt_vals</span>(<span class="ident">nm</span>).<span class="ident">is_empty</span>()
}
<span class="doccomment">/// Returns the number of times an option was matched.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">opt_count</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">nm</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">opt_vals</span>(<span class="ident">nm</span>).<span class="ident">len</span>()
}
<span class="doccomment">/// Returns a vector of all the positions in which an option was matched.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">opt_positions</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">nm</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">opt_vals</span>(<span class="ident">nm</span>).<span class="ident">into_iter</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">pos</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="ident">pos</span>).<span class="ident">collect</span>()
}
<span class="doccomment">/// Returns true if any of several options were matched.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">opts_present</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">names</span>: <span class="kw-2">&</span>[<span class="ident">String</span>]) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="ident">names</span>
.<span class="ident">iter</span>()
.<span class="ident">any</span>(<span class="op">|</span><span class="ident">nm</span><span class="op">|</span> <span class="kw">match</span> <span class="ident">find_opt</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">opts</span>, <span class="kw-2">&</span><span class="ident">Name::from_str</span>(<span class="kw-2">&</span><span class="ident">nm</span>)) {
<span class="prelude-val">Some</span>(<span class="ident">id</span>) <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">vals</span>[<span class="ident">id</span>].<span class="ident">is_empty</span>() <span class="op">=</span><span class="op">></span> <span class="bool-val">true</span>,
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="bool-val">false</span>,
})
}
<span class="doccomment">/// Returns the string argument supplied to one of several matching options or `None`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">opts_str</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">names</span>: <span class="kw-2">&</span>[<span class="ident">String</span>]) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">String</span><span class="op">></span> {
<span class="ident">names</span>
.<span class="ident">iter</span>()
.<span class="ident">filter_map</span>(<span class="op">|</span><span class="ident">nm</span><span class="op">|</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">opt_val</span>(<span class="kw-2">&</span><span class="ident">nm</span>) {
<span class="prelude-val">Some</span>(<span class="ident">Val</span>(<span class="ident">s</span>)) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">s</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
})
.<span class="ident">next</span>()
}
<span class="doccomment">/// Returns a vector of the arguments provided to all matches of the given</span>
<span class="doccomment">/// option.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Used when an option accepts multiple values.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">opt_strs</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">nm</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">String</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">opt_vals</span>(<span class="ident">nm</span>)
.<span class="ident">into_iter</span>()
.<span class="ident">filter_map</span>(<span class="op">|</span>(<span class="kw">_</span>, <span class="ident">v</span>)<span class="op">|</span> <span class="kw">match</span> <span class="ident">v</span> {
<span class="ident">Val</span>(<span class="ident">s</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">s</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
})
.<span class="ident">collect</span>()
}
<span class="doccomment">/// Returns a vector of the arguments provided to all matches of the given</span>
<span class="doccomment">/// option, together with their positions.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Used when an option accepts multiple values.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">opt_strs_pos</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">nm</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span>(<span class="ident">usize</span>, <span class="ident">String</span>)<span class="op">></span> {
<span class="self">self</span>.<span class="ident">opt_vals</span>(<span class="ident">nm</span>)
.<span class="ident">into_iter</span>()
.<span class="ident">filter_map</span>(<span class="op">|</span>(<span class="ident">p</span>, <span class="ident">v</span>)<span class="op">|</span> <span class="kw">match</span> <span class="ident">v</span> {
<span class="ident">Val</span>(<span class="ident">s</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>((<span class="ident">p</span>, <span class="ident">s</span>)),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
})
.<span class="ident">collect</span>()
}
<span class="doccomment">/// Returns the string argument supplied to a matching option or `None`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">opt_str</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">nm</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">String</span><span class="op">></span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">opt_val</span>(<span class="ident">nm</span>) {
<span class="prelude-val">Some</span>(<span class="ident">Val</span>(<span class="ident">s</span>)) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">s</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Returns the matching string, a default, or `None`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returns `None` if the option was not present, `def` if the option was</span>
<span class="doccomment">/// present but no argument was provided, and the argument if the option was</span>
<span class="doccomment">/// present and an argument was provided.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">opt_default</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">nm</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">def</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">String</span><span class="op">></span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">opt_val</span>(<span class="ident">nm</span>) {
<span class="prelude-val">Some</span>(<span class="ident">Val</span>(<span class="ident">s</span>)) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">s</span>),
<span class="prelude-val">Some</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">def</span>.<span class="ident">to_string</span>()),
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Returns some matching value or `None`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Similar to opt_str, also converts matching argument using FromStr.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">opt_get</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">nm</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">result::Result</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, <span class="ident">T::Err</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">T</span>: <span class="ident">FromStr</span>,
{
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">opt_val</span>(<span class="ident">nm</span>) {
<span class="prelude-val">Some</span>(<span class="ident">Val</span>(<span class="ident">s</span>)) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">s</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>)),
<span class="prelude-val">Some</span>(<span class="ident">Given</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>),
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>),
}
}
<span class="doccomment">/// Returns a matching value or default.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Similar to opt_default, except the two differences.</span>
<span class="doccomment">/// Instead of returning None when argument was not present, return `def`.</span>
<span class="doccomment">/// Instead of returning &str return type T, parsed using str::parse().</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">opt_get_default</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">nm</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">def</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="ident">result::Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">T::Err</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">T</span>: <span class="ident">FromStr</span>,
{
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">opt_val</span>(<span class="ident">nm</span>) {
<span class="prelude-val">Some</span>(<span class="ident">Val</span>(<span class="ident">s</span>)) <span class="op">=</span><span class="op">></span> <span class="ident">s</span>.<span class="ident">parse</span>(),
<span class="prelude-val">Some</span>(<span class="ident">Given</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="ident">def</span>),
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="ident">def</span>),
}
}
}
<span class="kw">fn</span> <span class="ident">is_arg</span>(<span class="ident">arg</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="ident">arg</span>.<span class="ident">as_bytes</span>().<span class="ident">get</span>(<span class="number">0</span>) <span class="op">=</span><span class="op">=</span> <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="string">b'-'</span>) <span class="op">&&</span> <span class="ident">arg</span>.<span class="ident">len</span>() <span class="op">></span> <span class="number">1</span>
}
<span class="kw">fn</span> <span class="ident">find_opt</span>(<span class="ident">opts</span>: <span class="kw-2">&</span>[<span class="ident">Opt</span>], <span class="ident">nm</span>: <span class="kw-2">&</span><span class="ident">Name</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="comment">// Search main options.</span>
<span class="kw">let</span> <span class="ident">pos</span> <span class="op">=</span> <span class="ident">opts</span>.<span class="ident">iter</span>().<span class="ident">position</span>(<span class="op">|</span><span class="ident">opt</span><span class="op">|</span> <span class="kw-2">&</span><span class="ident">opt</span>.<span class="ident">name</span> <span class="op">=</span><span class="op">=</span> <span class="ident">nm</span>);
<span class="kw">if</span> <span class="ident">pos</span>.<span class="ident">is_some</span>() {
<span class="kw">return</span> <span class="ident">pos</span>;
}
<span class="comment">// Search in aliases.</span>
<span class="kw">for</span> <span class="ident">candidate</span> <span class="kw">in</span> <span class="ident">opts</span>.<span class="ident">iter</span>() {
<span class="kw">if</span> <span class="ident">candidate</span>.<span class="ident">aliases</span>.<span class="ident">iter</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">opt</span><span class="op">|</span> <span class="kw-2">&</span><span class="ident">opt</span>.<span class="ident">name</span> <span class="op">=</span><span class="op">=</span> <span class="ident">nm</span>) {
<span class="kw">return</span> <span class="ident">opts</span>.<span class="ident">iter</span>().<span class="ident">position</span>(<span class="op">|</span><span class="ident">opt</span><span class="op">|</span> <span class="ident">opt</span>.<span class="ident">name</span> <span class="op">=</span><span class="op">=</span> <span class="ident">candidate</span>.<span class="ident">name</span>);
}
}
<span class="prelude-val">None</span>
}
<span class="kw">impl</span> <span class="ident">fmt::Display</span> <span class="kw">for</span> <span class="ident">Fail</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt::Formatter</span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt::Result</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">ArgumentMissing</span>(<span class="kw-2">ref</span> <span class="ident">nm</span>) <span class="op">=</span><span class="op">></span> <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"Argument to option '{}' missing"</span>, <span class="kw-2">*</span><span class="ident">nm</span>),
<span class="ident">UnrecognizedOption</span>(<span class="kw-2">ref</span> <span class="ident">nm</span>) <span class="op">=</span><span class="op">></span> <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"Unrecognized option: '{}'"</span>, <span class="kw-2">*</span><span class="ident">nm</span>),
<span class="ident">OptionMissing</span>(<span class="kw-2">ref</span> <span class="ident">nm</span>) <span class="op">=</span><span class="op">></span> <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"Required option '{}' missing"</span>, <span class="kw-2">*</span><span class="ident">nm</span>),
<span class="ident">OptionDuplicated</span>(<span class="kw-2">ref</span> <span class="ident">nm</span>) <span class="op">=</span><span class="op">></span> <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"Option '{}' given more than once"</span>, <span class="kw-2">*</span><span class="ident">nm</span>),
<span class="ident">UnexpectedArgument</span>(<span class="kw-2">ref</span> <span class="ident">nm</span>) <span class="op">=</span><span class="op">></span> <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"Option '{}' does not take an argument"</span>, <span class="kw-2">*</span><span class="ident">nm</span>),
}
}
}
<span class="kw">fn</span> <span class="ident">format_option</span>(<span class="ident">opt</span>: <span class="kw-2">&</span><span class="ident">OptGroup</span>) <span class="op">-</span><span class="op">></span> <span class="ident">String</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">line</span> <span class="op">=</span> <span class="ident">String::new</span>();
<span class="kw">if</span> <span class="ident">opt</span>.<span class="ident">occur</span> <span class="op">!</span><span class="op">=</span> <span class="ident">Req</span> {
<span class="ident">line</span>.<span class="ident">push</span>(<span class="string">'['</span>);
}
<span class="comment">// Use short_name if possible, but fall back to long_name.</span>
<span class="kw">if</span> <span class="op">!</span><span class="ident">opt</span>.<span class="ident">short_name</span>.<span class="ident">is_empty</span>() {
<span class="ident">line</span>.<span class="ident">push</span>(<span class="string">'-'</span>);
<span class="ident">line</span>.<span class="ident">push_str</span>(<span class="kw-2">&</span><span class="ident">opt</span>.<span class="ident">short_name</span>);
} <span class="kw">else</span> {
<span class="ident">line</span>.<span class="ident">push_str</span>(<span class="string">"--"</span>);
<span class="ident">line</span>.<span class="ident">push_str</span>(<span class="kw-2">&</span><span class="ident">opt</span>.<span class="ident">long_name</span>);
}
<span class="kw">if</span> <span class="ident">opt</span>.<span class="ident">hasarg</span> <span class="op">!</span><span class="op">=</span> <span class="ident">No</span> {
<span class="ident">line</span>.<span class="ident">push</span>(<span class="string">' '</span>);
<span class="kw">if</span> <span class="ident">opt</span>.<span class="ident">hasarg</span> <span class="op">=</span><span class="op">=</span> <span class="ident">Maybe</span> {
<span class="ident">line</span>.<span class="ident">push</span>(<span class="string">'['</span>);
}
<span class="ident">line</span>.<span class="ident">push_str</span>(<span class="kw-2">&</span><span class="ident">opt</span>.<span class="ident">hint</span>);
<span class="kw">if</span> <span class="ident">opt</span>.<span class="ident">hasarg</span> <span class="op">=</span><span class="op">=</span> <span class="ident">Maybe</span> {
<span class="ident">line</span>.<span class="ident">push</span>(<span class="string">']'</span>);
}
}
<span class="kw">if</span> <span class="ident">opt</span>.<span class="ident">occur</span> <span class="op">!</span><span class="op">=</span> <span class="ident">Req</span> {
<span class="ident">line</span>.<span class="ident">push</span>(<span class="string">']'</span>);
}
<span class="kw">if</span> <span class="ident">opt</span>.<span class="ident">occur</span> <span class="op">=</span><span class="op">=</span> <span class="ident">Multi</span> {
<span class="ident">line</span>.<span class="ident">push_str</span>(<span class="string">".."</span>);
}
<span class="ident">line</span>
}
<span class="doccomment">/// Splits a string into substrings with possibly internal whitespace,</span>
<span class="doccomment">/// each of them at most `lim` bytes long, if possible. The substrings</span>
<span class="doccomment">/// have leading and trailing whitespace removed, and are only cut at</span>
<span class="doccomment">/// whitespace boundaries.</span>
<span class="kw">fn</span> <span class="ident">each_split_within</span>(<span class="ident">desc</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">lim</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">String</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rows</span> <span class="op">=</span> <span class="ident">Vec::new</span>();
<span class="kw">for</span> <span class="ident">line</span> <span class="kw">in</span> <span class="ident">desc</span>.<span class="ident">trim</span>().<span class="ident">lines</span>() {
<span class="kw">let</span> <span class="ident">line_chars</span> <span class="op">=</span> <span class="ident">line</span>.<span class="ident">chars</span>().<span class="ident">chain</span>(<span class="prelude-val">Some</span>(<span class="string">' '</span>));
<span class="kw">let</span> <span class="ident">words</span> <span class="op">=</span> <span class="ident">line_chars</span>
.<span class="ident">fold</span>((<span class="ident">Vec::new</span>(), <span class="number">0</span>, <span class="number">0</span>), <span class="op">|</span>(<span class="kw-2">mut</span> <span class="ident">words</span>, <span class="ident">a</span>, <span class="ident">z</span>), <span class="ident">c</span><span class="op">|</span> {
<span class="kw">let</span> <span class="ident">idx</span> <span class="op">=</span> <span class="ident">z</span> <span class="op">+</span> <span class="ident">c</span>.<span class="ident">len_utf8</span>(); <span class="comment">// Get the current byte offset</span>
<span class="comment">// If the char is whitespace, advance the word start and maybe push a word</span>
<span class="kw">if</span> <span class="ident">c</span>.<span class="ident">is_whitespace</span>() {
<span class="kw">if</span> <span class="ident">a</span> <span class="op">!</span><span class="op">=</span> <span class="ident">z</span> {
<span class="ident">words</span>.<span class="ident">push</span>(<span class="kw-2">&</span><span class="ident">line</span>[<span class="ident">a</span>..<span class="ident">z</span>]);
}
(<span class="ident">words</span>, <span class="ident">idx</span>, <span class="ident">idx</span>)
}
<span class="comment">// If the char is not whitespace, continue, retaining the current</span>
<span class="kw">else</span> {
(<span class="ident">words</span>, <span class="ident">a</span>, <span class="ident">idx</span>)
}
})
.<span class="number">0</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">row</span> <span class="op">=</span> <span class="ident">String::new</span>();
<span class="kw">for</span> <span class="ident">word</span> <span class="kw">in</span> <span class="ident">words</span>.<span class="ident">iter</span>() {
<span class="kw">let</span> <span class="ident">sep</span> <span class="op">=</span> <span class="kw">if</span> <span class="op">!</span><span class="ident">row</span>.<span class="ident">is_empty</span>() { <span class="prelude-val">Some</span>(<span class="string">" "</span>) } <span class="kw">else</span> { <span class="prelude-val">None</span> };
<span class="kw">let</span> <span class="ident">width</span> <span class="op">=</span> <span class="ident">row</span>.<span class="ident">width</span>() <span class="op">+</span> <span class="ident">word</span>.<span class="ident">width</span>() <span class="op">+</span> <span class="ident">sep</span>.<span class="ident">map</span>(<span class="ident">UnicodeWidthStr::width</span>).<span class="ident">unwrap_or</span>(<span class="number">0</span>);
<span class="kw">if</span> <span class="ident">width</span> <span class="op"><</span><span class="op">=</span> <span class="ident">lim</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">sep</span>) <span class="op">=</span> <span class="ident">sep</span> {
<span class="ident">row</span>.<span class="ident">push_str</span>(<span class="ident">sep</span>)
}
<span class="ident">row</span>.<span class="ident">push_str</span>(<span class="ident">word</span>);
<span class="kw">continue</span>;
}
<span class="kw">if</span> <span class="op">!</span><span class="ident">row</span>.<span class="ident">is_empty</span>() {
<span class="ident">rows</span>.<span class="ident">push</span>(<span class="ident">row</span>.<span class="ident">clone</span>());
<span class="ident">row</span>.<span class="ident">clear</span>();
}
<span class="ident">row</span>.<span class="ident">push_str</span>(<span class="ident">word</span>);
}
<span class="kw">if</span> <span class="op">!</span><span class="ident">row</span>.<span class="ident">is_empty</span>() {
<span class="ident">rows</span>.<span class="ident">push</span>(<span class="ident">row</span>);
}
}
<span class="ident">rows</span>
}
</pre></div>
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