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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">std::collections::BTreeSet</span>;

<span class="kw">use</span> <span class="ident">map_gui::tools</span>::{<span class="ident">ColorDiscrete</span>, <span class="ident">PopupMsg</span>};
<span class="kw">use</span> <span class="ident">map_model</span>::{<span class="ident">connectivity</span>, <span class="ident">EditCmd</span>, <span class="ident">PathConstraints</span>};
<span class="kw">use</span> <span class="ident">widgetry</span>::{<span class="ident">Color</span>, <span class="ident">EventCtx</span>, <span class="ident">State</span>};

<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::app::App</span>;

<span class="comment">// All of these take a candidate EditCmd to do, then see if it&#39;s valid. If they return None, it&#39;s</span>
<span class="comment">// fine. They always leave the map in the original state without the new EditCmd.</span>

<span class="comment">// Could be caused by closing intersections</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">check_sidewalk_connectivity</span>(
    <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>,
    <span class="ident">app</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">App</span>,
    <span class="ident">cmd</span>: <span class="ident">EditCmd</span>,
) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">State</span><span class="op">&lt;</span><span class="ident">App</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span> {
    <span class="kw">let</span> <span class="ident">orig_edits</span> <span class="op">=</span> <span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">map</span>.<span class="ident">get_edits</span>().<span class="ident">clone</span>();
    <span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">disconnected_before</span>) <span class="op">=</span>
        <span class="ident">connectivity::find_scc</span>(<span class="kw-2">&amp;</span><span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">map</span>, <span class="ident">PathConstraints::Pedestrian</span>);

    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">edits</span> <span class="op">=</span> <span class="ident">orig_edits</span>.<span class="ident">clone</span>();
    <span class="ident">edits</span>.<span class="ident">commands</span>.<span class="ident">push</span>(<span class="ident">cmd</span>);
    <span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">map</span>.<span class="ident">try_apply_edits</span>(<span class="ident">edits</span>);

    <span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">disconnected_after</span>) <span class="op">=</span>
        <span class="ident">connectivity::find_scc</span>(<span class="kw-2">&amp;</span><span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">map</span>, <span class="ident">PathConstraints::Pedestrian</span>);
    <span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">map</span>.<span class="ident">must_apply_edits</span>(<span class="ident">orig_edits</span>);

    <span class="kw">let</span> <span class="ident">newly_disconnected</span> <span class="op">=</span> <span class="ident">disconnected_after</span>
        .<span class="ident">difference</span>(<span class="kw-2">&amp;</span><span class="ident">disconnected_before</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">newly_disconnected</span>.<span class="ident">is_empty</span>() {
        <span class="kw">return</span> <span class="prelude-val">None</span>;
    }

    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">ColorDiscrete::new</span>(<span class="ident">app</span>, <span class="macro">vec!</span>[(<span class="string">&quot;disconnected&quot;</span>, <span class="ident">Color::RED</span>)]);
    <span class="kw">let</span> <span class="ident">num</span> <span class="op">=</span> <span class="ident">newly_disconnected</span>.<span class="ident">len</span>();
    <span class="kw">for</span> <span class="ident">l</span> <span class="kw">in</span> <span class="ident">newly_disconnected</span> {
        <span class="ident">c</span>.<span class="ident">add_l</span>(<span class="kw-2">*</span><span class="ident">l</span>, <span class="string">&quot;disconnected&quot;</span>);
    }
    <span class="kw">let</span> (<span class="ident">unzoomed</span>, <span class="ident">zoomed</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">c</span>.<span class="ident">build</span>(<span class="ident">ctx</span>);

    <span class="prelude-val">Some</span>(<span class="ident">PopupMsg::also_draw</span>(
        <span class="ident">ctx</span>,
        <span class="string">&quot;Error&quot;</span>,
        <span class="macro">vec!</span>[<span class="macro">format!</span>(
            <span class="string">&quot;Can&#39;t close this intersection; {} sidewalks disconnected&quot;</span>,
            <span class="ident">num</span>
        )],
        <span class="ident">unzoomed</span>,
        <span class="ident">zoomed</span>,
    ))
}

<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused</span>)]</span>
<span class="comment">// Could be caused by closing intersections, changing lane types, or reversing lanes</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">check_blackholes</span>(
    <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>,
    <span class="ident">app</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">App</span>,
    <span class="ident">cmd</span>: <span class="ident">EditCmd</span>,
) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">State</span><span class="op">&lt;</span><span class="ident">App</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span> {
    <span class="kw">let</span> <span class="ident">orig_edits</span> <span class="op">=</span> <span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">map</span>.<span class="ident">get_edits</span>().<span class="ident">clone</span>();
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">driving_ok_originally</span> <span class="op">=</span> <span class="ident">BTreeSet::new</span>();
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">biking_ok_originally</span> <span class="op">=</span> <span class="ident">BTreeSet::new</span>();
    <span class="kw">for</span> <span class="ident">l</span> <span class="kw">in</span> <span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">map</span>.<span class="ident">all_lanes</span>().<span class="ident">values</span>() {
        <span class="kw">if</span> <span class="op">!</span><span class="ident">l</span>.<span class="ident">driving_blackhole</span> {
            <span class="ident">driving_ok_originally</span>.<span class="ident">insert</span>(<span class="ident">l</span>.<span class="ident">id</span>);
        }
        <span class="kw">if</span> <span class="op">!</span><span class="ident">l</span>.<span class="ident">biking_blackhole</span> {
            <span class="ident">biking_ok_originally</span>.<span class="ident">insert</span>(<span class="ident">l</span>.<span class="ident">id</span>);
        }
    }

    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">edits</span> <span class="op">=</span> <span class="ident">orig_edits</span>.<span class="ident">clone</span>();
    <span class="ident">edits</span>.<span class="ident">commands</span>.<span class="ident">push</span>(<span class="ident">cmd</span>);
    <span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">map</span>.<span class="ident">try_apply_edits</span>(<span class="ident">edits</span>);

    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">newly_disconnected</span> <span class="op">=</span> <span class="ident">BTreeSet::new</span>();
    <span class="kw">for</span> <span class="ident">l</span> <span class="kw">in</span> <span class="ident">connectivity::find_scc</span>(<span class="kw-2">&amp;</span><span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">map</span>, <span class="ident">PathConstraints::Car</span>).<span class="number">1</span> {
        <span class="kw">if</span> <span class="ident">driving_ok_originally</span>.<span class="ident">contains</span>(<span class="kw-2">&amp;</span><span class="ident">l</span>) {
            <span class="ident">newly_disconnected</span>.<span class="ident">insert</span>(<span class="ident">l</span>);
        }
    }
    <span class="kw">for</span> <span class="ident">l</span> <span class="kw">in</span> <span class="ident">connectivity::find_scc</span>(<span class="kw-2">&amp;</span><span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">map</span>, <span class="ident">PathConstraints::Bike</span>).<span class="number">1</span> {
        <span class="kw">if</span> <span class="ident">biking_ok_originally</span>.<span class="ident">contains</span>(<span class="kw-2">&amp;</span><span class="ident">l</span>) {
            <span class="ident">newly_disconnected</span>.<span class="ident">insert</span>(<span class="ident">l</span>);
        }
    }
    <span class="ident">app</span>.<span class="ident">primary</span>.<span class="ident">map</span>.<span class="ident">must_apply_edits</span>(<span class="ident">orig_edits</span>);

    <span class="kw">if</span> <span class="ident">newly_disconnected</span>.<span class="ident">is_empty</span>() {
        <span class="kw">return</span> <span class="prelude-val">None</span>;
    }

    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">ColorDiscrete::new</span>(<span class="ident">app</span>, <span class="macro">vec!</span>[(<span class="string">&quot;disconnected&quot;</span>, <span class="ident">Color::RED</span>)]);
    <span class="kw">let</span> <span class="ident">num</span> <span class="op">=</span> <span class="ident">newly_disconnected</span>.<span class="ident">len</span>();
    <span class="kw">for</span> <span class="ident">l</span> <span class="kw">in</span> <span class="ident">newly_disconnected</span> {
        <span class="ident">c</span>.<span class="ident">add_l</span>(<span class="ident">l</span>, <span class="string">&quot;disconnected&quot;</span>);
    }
    <span class="kw">let</span> (<span class="ident">unzoomed</span>, <span class="ident">zoomed</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">c</span>.<span class="ident">build</span>(<span class="ident">ctx</span>);

    <span class="prelude-val">Some</span>(<span class="ident">PopupMsg::also_draw</span>(
        <span class="ident">ctx</span>,
        <span class="string">&quot;Error&quot;</span>,
        <span class="macro">vec!</span>[<span class="macro">format!</span>(<span class="string">&quot;{} lanes have been disconnected&quot;</span>, <span class="ident">num</span>)],
        <span class="ident">unzoomed</span>,
        <span class="ident">zoomed</span>,
    ))
}
</pre></div>
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