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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::{<span class="ident">HashMap</span>, <span class="ident">HashSet</span>};

<span class="doccomment">/// Yet another barebones command-line flag parsing library.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">CmdArgs</span> {
    <span class="ident">kv</span>: <span class="ident">HashMap</span><span class="op">&lt;</span><span class="ident">String</span>, <span class="ident">String</span><span class="op">&gt;</span>,
    <span class="ident">bits</span>: <span class="ident">HashSet</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,
    <span class="ident">free</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,

    <span class="ident">used</span>: <span class="ident">HashSet</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span> <span class="ident">CmdArgs</span> {
    <span class="doccomment">/// On native, initialize with real flags. On web, transform URL query parameters into flags.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Calling this has the side-effect of initializing logging on both native and web. This</span>
    <span class="doccomment">/// should probably be done independently, but for the moment, every app wants both.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">&gt;</span> <span class="ident">CmdArgs</span> {
        <span class="kw">crate</span>::<span class="ident">logger</span>::<span class="ident">setup</span>();

        <span class="kw">if</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>) {
            <span class="kw">let</span> <span class="ident">raw</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">parse_args</span>() {
                <span class="prelude-val">Ok</span>(<span class="ident">raw</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="ident">raw</span>,
                <span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span><span class="op">&gt;</span> {
                    <span class="ident">log</span>::<span class="macro">warn</span><span class="macro">!</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</span>::<span class="ident">new</span>()
                }
            };
            <span class="ident">CmdArgs</span>::<span class="ident">from_args</span>(<span class="ident">raw</span>)
        } <span class="kw">else</span> {
            <span class="ident">CmdArgs</span>::<span class="ident">from_args</span>(<span class="ident">std</span>::<span class="ident">env</span>::<span class="ident">args</span>().<span class="ident">skip</span>(<span class="number">1</span>).<span class="ident">collect</span>())
        }
    }

    <span class="kw">fn</span> <span class="ident">from_args</span>(<span class="ident">raw</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">CmdArgs</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">args</span> <span class="op">=</span> <span class="ident">CmdArgs</span> {
            <span class="ident">kv</span>: <span class="ident">HashMap</span>::<span class="ident">new</span>(),
            <span class="ident">bits</span>: <span class="ident">HashSet</span>::<span class="ident">new</span>(),
            <span class="ident">free</span>: <span class="ident">Vec</span>::<span class="ident">new</span>(),
            <span class="ident">used</span>: <span class="ident">HashSet</span>::<span class="ident">new</span>(),
        };

        <span class="kw">for</span> <span class="ident">arg</span> <span class="kw">in</span> <span class="ident">raw</span> {
            <span class="kw">let</span> <span class="ident">parts</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">arg</span>.<span class="ident">split</span>(<span class="string">&#39;=&#39;</span>).<span class="ident">collect</span>();
            <span class="kw">if</span> <span class="ident">parts</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">1</span> {
                <span class="kw">if</span> <span class="ident">arg</span>.<span class="ident">starts_with</span>(<span class="string">&quot;--&quot;</span>) {
                    <span class="ident">args</span>.<span class="ident">bits</span>.<span class="ident">insert</span>(<span class="ident">arg</span>);
                } <span class="kw">else</span> {
                    <span class="ident">args</span>.<span class="ident">free</span>.<span class="ident">push</span>(<span class="ident">arg</span>);
                }
            } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">parts</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">2</span> {
                <span class="ident">args</span>.<span class="ident">kv</span>.<span class="ident">insert</span>(<span class="ident">parts</span>[<span class="number">0</span>].<span class="ident">to_string</span>(), <span class="ident">parts</span>[<span class="number">1</span>].<span class="ident">to_string</span>());
            } <span class="kw">else</span> {
                <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Weird argument {}&quot;</span>, <span class="ident">arg</span>);
            }
        }

        <span class="ident">args</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">required</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">String</span> {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">value</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">kv</span>.<span class="ident">remove</span>(<span class="ident">key</span>) {
            <span class="ident">value</span>
        } <span class="kw">else</span> {
            <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Missing required arg {}&quot;</span>, <span class="ident">key</span>);
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">optional</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">value</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">kv</span>.<span class="ident">remove</span>(<span class="ident">key</span>) {
            <span class="self">self</span>.<span class="ident">used</span>.<span class="ident">insert</span>(<span class="ident">key</span>.<span class="ident">to_string</span>());
            <span class="prelude-val">Some</span>(<span class="ident">value</span>)
        } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">used</span>.<span class="ident">contains</span>(<span class="ident">key</span>) {
            <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;args.optional(\&quot;{}\&quot;) called twice!&quot;</span>, <span class="ident">key</span>);
        } <span class="kw">else</span> {
            <span class="prelude-val">None</span>
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">optional_parse</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">E</span>, <span class="ident">F</span>: <span class="ident">Fn</span>(<span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">E</span><span class="op">&gt;</span><span class="op">&gt;</span>(
        <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>,
        <span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>,
        <span class="ident">parser</span>: <span class="ident">F</span>,
    ) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">optional</span>(<span class="ident">key</span>)<span class="question-mark">?</span>;
        <span class="kw">match</span> <span class="ident">parser</span>(<span class="kw-2">&amp;</span><span class="ident">value</span>) {
            <span class="prelude-val">Ok</span>(<span class="ident">result</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">result</span>),
            <span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Bad argument {}={}&quot;</span>, <span class="ident">key</span>, <span class="ident">value</span>),
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">true_false</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">required</span>(<span class="ident">key</span>).<span class="ident">as_ref</span>() {
            <span class="string">&quot;true&quot;</span> <span class="op">=</span><span class="op">&gt;</span> <span class="bool-val">true</span>,
            <span class="string">&quot;false&quot;</span> <span class="op">=</span><span class="op">&gt;</span> <span class="bool-val">false</span>,
            <span class="ident">x</span> <span class="op">=</span><span class="op">&gt;</span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;{}={} is invalid; must be true or false&quot;</span>, <span class="ident">key</span>, <span class="ident">x</span>),
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">enabled</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">bits</span>.<span class="ident">remove</span>(<span class="ident">key</span>) {
            <span class="self">self</span>.<span class="ident">used</span>.<span class="ident">insert</span>(<span class="ident">key</span>.<span class="ident">to_string</span>());
            <span class="bool-val">true</span>
        } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">used</span>.<span class="ident">contains</span>(<span class="ident">key</span>) {
            <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;args.enabled(\&quot;{}\&quot;) called twice!&quot;</span>, <span class="ident">key</span>);
        } <span class="kw">else</span> {
            <span class="bool-val">false</span>
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">required_free</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">String</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">free</span>.<span class="ident">is_empty</span>() {
            <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Required free argument not provided&quot;</span>);
        }
        <span class="self">self</span>.<span class="ident">free</span>.<span class="ident">remove</span>(<span class="number">0</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">optional_free</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">free</span>.<span class="ident">is_empty</span>() {
            <span class="prelude-val">None</span>
        } <span class="kw">else</span> {
            <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">free</span>.<span class="ident">remove</span>(<span class="number">0</span>))
        }
    }

    <span class="comment">// TODO Drop?</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">done</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">kv</span>.<span class="ident">is_empty</span>() {
            <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Unused arguments: {:?}&quot;</span>, <span class="self">self</span>.<span class="ident">kv</span>);
        }
        <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">bits</span>.<span class="ident">is_empty</span>() {
            <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Unused arguments: {:?}&quot;</span>, <span class="self">self</span>.<span class="ident">bits</span>);
        }
        <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">free</span>.<span class="ident">is_empty</span>() {
            <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Unused free arguments: {:?}&quot;</span>, <span class="self">self</span>.<span class="ident">free</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="doccomment">/// Transform the URL query parameters into command-line arguments, by treating &amp; as the separator</span>
<span class="doccomment">/// between arguments. So for instance &quot;?--dev&amp;--color_scheme=night%20mode&quot; becomes vec![&quot;--dev&quot;,</span>
<span class="doccomment">/// &quot;--color_scheme=night mode&quot;].</span>
<span class="kw">fn</span> <span class="ident">parse_args</span>() <span class="op">-</span><span class="op">&gt;</span> <span class="ident">anyhow</span>::<span class="prelude-ty">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">use</span> <span class="ident">anyhow</span>::{<span class="ident">anyhow</span>, <span class="ident">bail</span>};

    <span class="kw">let</span> <span class="ident">window</span> <span class="op">=</span> <span class="ident">web_sys</span>::<span class="ident">window</span>().<span class="ident">ok_or</span>(<span class="macro">anyhow</span><span class="macro">!</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="macro">!</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="macro">!</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>)
}

<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="kw">fn</span> <span class="ident">parse_args</span>() <span class="op">-</span><span class="op">&gt;</span> <span class="ident">anyhow</span>::<span class="prelude-ty">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="macro">unreachable</span><span class="macro">!</span>()
}
</pre></div>
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