<!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 `abstutil/src/cli.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>cli.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script src="../../crates.js"></script><script defer src="../../main.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script>
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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">std::ffi::OsString</span>;

<span class="doccomment">/// Returns arguments passed in from the command-line, starting with the program name.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// On web, this transforms URL query parameters into command-line arguments, by treating `&amp;` as</span>
<span class="doccomment">/// the separator between arguments. So for instance &quot;?--dev&amp;--color_scheme=night%20mode&quot; becomes</span>
<span class="doccomment">/// vec![&quot;dummy program name&quot;, &quot;--dev&quot;, &quot;--color_scheme=night mode&quot;].</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">cli_args</span>() -&gt; <span class="kw">impl</span> <span class="ident">Iterator</span><span class="op">&lt;</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">OsString</span><span class="op">&gt;</span> {
    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>)]</span>
    {
        <span class="kw">match</span> <span class="ident">parse_args</span>() {
            <span class="prelude-val">Ok</span>(<span class="kw-2">mut</span> <span class="ident">args</span>) =&gt; {
                <span class="ident">args</span>.<span class="ident">insert</span>(<span class="number">0</span>, <span class="string">&quot;dummy program name&quot;</span>.<span class="ident">to_string</span>());
                <span class="kw">let</span> <span class="ident">x</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">OsString</span><span class="op">&gt;</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">x</span><span class="op">|</span> <span class="ident">x</span>.<span class="ident">into</span>()).<span class="ident">collect</span>();
                <span class="kw">return</span> <span class="ident">x</span>.<span class="ident">into_iter</span>();
            }
            <span class="prelude-val">Err</span>(<span class="ident">err</span>) =&gt; {
                <span class="macro">warn!</span>(<span class="string">&quot;Didn&#39;t parse arguments from URL query params: {}&quot;</span>, <span class="ident">err</span>);
                <span class="ident">Vec::new</span>().<span class="ident">into_iter</span>()
            }
        }
    }
    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>))]</span>
    {
        <span class="ident">std::env::args_os</span>()
    }
}

<span class="doccomment">/// Transforms some command-line arguments into URL query parameters, using `&amp;` as the separator</span>
<span class="doccomment">/// between arguments. The string returned starts with `?`, unless the arguments are all empty.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">args_to_query_string</span>(<span class="ident">args</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>) -&gt; <span class="ident">String</span> {
    <span class="comment">// TODO Similar to parse_args forgoing a URL decoding crate, just handle this one</span>
    <span class="comment">// transformation</span>
    <span class="kw">let</span> <span class="ident">result</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">x</span><span class="op">|</span> <span class="ident">x</span>.<span class="ident">replace</span>(<span class="string">&quot; &quot;</span>, <span class="string">&quot;%20&quot;</span>))
        .<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span><span class="op">&gt;</span>()
        .<span class="ident">join</span>(<span class="string">&quot;&amp;&quot;</span>);
    <span class="kw">if</span> <span class="ident">result</span>.<span class="ident">is_empty</span>() {
        <span class="ident">result</span>
    } <span class="kw">else</span> {
        <span class="macro">format!</span>(<span class="string">&quot;?{}&quot;</span>, <span class="ident">result</span>)
    }
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>)]</span>
<span class="kw">fn</span> <span class="ident">parse_args</span>() -&gt; <span class="ident">anyhow::Result</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span><span class="op">&gt;</span> {
    <span class="kw">let</span> <span class="ident">window</span> <span class="op">=</span> <span class="ident">web_sys::window</span>().<span class="ident">ok_or</span>(<span class="macro">anyhow!</span>(<span class="string">&quot;no window?&quot;</span>))<span class="question-mark">?</span>;
    <span class="kw">let</span> <span class="ident">url</span> <span class="op">=</span> <span class="ident">window</span>.<span class="ident">location</span>().<span class="ident">href</span>().<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> {
        <span class="macro">anyhow!</span>(<span class="ident">err</span>
            .<span class="ident">as_string</span>()
            .<span class="ident">unwrap_or</span>(<span class="string">&quot;window.location.href failed&quot;</span>.<span class="ident">to_string</span>()))
    })<span class="question-mark">?</span>;
    <span class="comment">// Consider using a proper url parsing crate. This works fine for now, though.</span>
    <span class="kw">let</span> <span class="ident">url_parts</span> <span class="op">=</span> <span class="ident">url</span>.<span class="ident">split</span>(<span class="string">&quot;?&quot;</span>).<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span><span class="op">&gt;</span>();
    <span class="kw">if</span> <span class="ident">url_parts</span>.<span class="ident">len</span>() <span class="op">!</span><span class="op">=</span> <span class="number">2</span> {
        <span class="macro">bail!</span>(<span class="string">&quot;URL {} doesn&#39;t seem to have query params&quot;</span>);
    }
    <span class="kw">let</span> <span class="ident">parts</span> <span class="op">=</span> <span class="ident">url_parts</span>[<span class="number">1</span>]
        .<span class="ident">split</span>(<span class="string">&quot;&amp;&quot;</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">replace</span>(<span class="string">&quot;%20&quot;</span>, <span class="string">&quot; &quot;</span>).<span class="ident">to_string</span>())
        .<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span><span class="op">&gt;</span>();
    <span class="prelude-val">Ok</span>(<span class="ident">parts</span>)
}
</code></pre></div>
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