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id="62">62</span> <span id="63">63</span> <span id="64">64</span> </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 `&` as</span> <span class="doccomment">/// the separator between arguments. So for instance "?--dev&--color_scheme=night%20mode" becomes</span> <span class="doccomment">/// vec!["dummy program name", "--dev", "--color_scheme=night mode"].</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">cli_args</span>() -> <span class="kw">impl</span> <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">OsString</span><span class="op">></span> { <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"wasm32"</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>) => { <span class="ident">args</span>.<span class="ident">insert</span>(<span class="number">0</span>, <span class="string">"dummy program name"</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"><</span><span class="ident">OsString</span><span class="op">></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>) => { <span class="macro">warn!</span>(<span class="string">"Didn't parse arguments from URL query params: {}"</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">"wasm32"</span>))]</span> { <span class="ident">std::env::args_os</span>() } } <span class="doccomment">/// Transforms some command-line arguments into URL query parameters, using `&` 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"><</span><span class="ident">String</span><span class="op">></span>) -> <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">" "</span>, <span class="string">"%20"</span>)) .<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span><span class="op">></span>() .<span class="ident">join</span>(<span class="string">"&"</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">"?{}"</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">"wasm32"</span>)]</span> <span class="kw">fn</span> <span class="ident">parse_args</span>() -> <span class="ident">anyhow::Result</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="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">"no window?"</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">"window.location.href failed"</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">"?"</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span><span class="op">></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">"URL {} doesn't seem to have query params"</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">"&"</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">"%20"</span>, <span class="string">" "</span>).<span class="ident">to_string</span>()) .<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span><span class="op">></span>(); <span class="prelude-val">Ok</span>(<span class="ident">parts</span>) } </code></pre></div> </section><section id="search" class="content hidden"></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="abstutil" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.60.0 (7737e0b5c 2022-04-04)" ></div> </body></html>