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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">std::collections</span>::{<span class="ident">BTreeMap</span>, <span class="ident">BTreeSet</span>};

<span class="kw">use</span> <span class="ident">serde</span>::{<span class="ident">Deserialize</span>, <span class="ident">Serialize</span>};

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

<span class="doccomment">/// A list of all canonical data files for A/B Street that&#39;re uploaded somewhere. The file formats</span>
<span class="doccomment">/// are tied to the latest version of the git repo. Players use the updater crate to sync these</span>
<span class="doccomment">/// files with local copies.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Manifest</span> {
    <span class="doccomment">/// Keyed by path, starting with &quot;data/&quot;</span>
    <span class="kw">pub</span> <span class="ident">entries</span>: <span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">String</span>, <span class="ident">Entry</span><span class="op">&gt;</span>,
}

<span class="doccomment">/// A single file</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Entry</span> {
    <span class="doccomment">/// md5sum of the file</span>
    <span class="kw">pub</span> <span class="ident">checksum</span>: <span class="ident">String</span>,
    <span class="doccomment">/// Uncompressed size in bytes. Because we have some massive files more than 2^32 bytes</span>
    <span class="doccomment">/// described by this, explicitly use u64 instead of usize, so wasm doesn&#39;t break.</span>
    <span class="kw">pub</span> <span class="ident">uncompressed_size_bytes</span>: <span class="ident">u64</span>,
    <span class="doccomment">/// Compressed size in bytes</span>
    <span class="kw">pub</span> <span class="ident">compressed_size_bytes</span>: <span class="ident">u64</span>,
}

<span class="kw">impl</span> <span class="ident">Manifest</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">pub</span> <span class="kw">fn</span> <span class="ident">load</span>() -&gt; <span class="ident">Manifest</span> {
        <span class="ident"><span class="kw">crate</span>::maybe_read_json</span>(
            <span class="ident"><span class="kw">crate</span>::path</span>(<span class="string">&quot;MANIFEST.json&quot;</span>),
            <span class="kw-2">&amp;mut</span> <span class="ident">abstutil::Timer::throwaway</span>(),
        )
        .<span class="ident">unwrap</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">pub</span> <span class="kw">fn</span> <span class="ident">load</span>() -&gt; <span class="ident">Manifest</span> {
        <span class="ident">abstutil::from_json</span>(<span class="kw-2">&amp;</span><span class="macro">include_bytes!</span>(<span class="string">&quot;../../data/MANIFEST.json&quot;</span>).<span class="ident">to_vec</span>()).<span class="ident">unwrap</span>()
    }

    <span class="doccomment">/// Removes entries from the Manifest to match the DataPacks that should exist locally.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">filter</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">data_packs</span>: <span class="ident">DataPacks</span>) -&gt; <span class="ident">Manifest</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">remove</span> <span class="op">=</span> <span class="ident">Vec::new</span>();
        <span class="kw">for</span> <span class="ident">path</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">entries</span>.<span class="ident">keys</span>() {
            <span class="kw">if</span> <span class="ident">path</span>.<span class="ident">starts_with</span>(<span class="string">&quot;data/system/extra_fonts&quot;</span>) {
                <span class="comment">// Always grab all of these</span>
                <span class="kw">continue</span>;
            }
            <span class="comment">// If the user has opted into any input data at all, we want to grab some of the shared</span>
            <span class="comment">// input files.</span>
            <span class="kw">if</span> <span class="ident">path</span>.<span class="ident">starts_with</span>(<span class="string">&quot;data/input/shared&quot;</span>) {
                <span class="comment">// But some of the files are large, so of course we hardcode some more overrides</span>
                <span class="comment">// here. Maybe some of this data should be scoped to a country, not a city.</span>
                <span class="kw">if</span> <span class="ident">path</span>.<span class="ident">ends_with</span>(<span class="string">&quot;Road Safety Data - Accidents 2019.csv&quot;</span>)
                    <span class="op">|</span><span class="op">|</span> <span class="ident">path</span>.<span class="ident">ends_with</span>(<span class="string">&quot;wu03ew_v2.csv&quot;</span>)
                    <span class="op">|</span><span class="op">|</span> <span class="ident">path</span>.<span class="ident">ends_with</span>(<span class="string">&quot;zones_core.geojson&quot;</span>)
                {
                    <span class="kw">if</span> <span class="ident">data_packs</span>.<span class="ident">input</span>.<span class="ident">iter</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span>.<span class="ident">starts_with</span>(<span class="string">&quot;gb/&quot;</span>)) {
                        <span class="kw">continue</span>;
                    }
                } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">path</span>.<span class="ident">ends_with</span>(<span class="string">&quot;kc_2016_lidar.tif&quot;</span>)
                    <span class="op">|</span><span class="op">|</span> <span class="ident">path</span>.<span class="ident">ends_with</span>(<span class="string">&quot;seattle_contours.geojson&quot;</span>)
                {
                    <span class="kw">if</span> <span class="ident">data_packs</span>.<span class="ident">input</span>.<span class="ident">contains</span>(<span class="string">&quot;us/seattle&quot;</span>) {
                        <span class="kw">continue</span>;
                    }
                } <span class="kw">else</span> <span class="kw">if</span> <span class="op">!</span><span class="ident">data_packs</span>.<span class="ident">input</span>.<span class="ident">is_empty</span>() {
                    <span class="comment">// All of the SRTM files land here. Hard to associate them with a country or</span>
                    <span class="comment">// city code, and it seems like we may want to share these between cities.</span>
                    <span class="kw">continue</span>;
                }
            }

            <span class="kw">let</span> <span class="ident">parts</span> <span class="op">=</span> <span class="ident">path</span>.<span class="ident">split</span>(<span class="string">&#39;/&#39;</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">let</span> <span class="kw-2">mut</span> <span class="ident">data_pack</span> <span class="op">=</span> <span class="macro">format!</span>(<span class="string">&quot;{}/{}&quot;</span>, <span class="ident">parts</span>[<span class="number">2</span>], <span class="ident">parts</span>[<span class="number">3</span>]);
            <span class="kw">if</span> <span class="ident">Manifest::is_file_part_of_huge_seattle</span>(<span class="ident">path</span>) {
                <span class="ident">data_pack</span> <span class="op">=</span> <span class="string">&quot;us/huge_seattle&quot;</span>.<span class="ident">to_string</span>();
            }
            <span class="kw">if</span> <span class="ident">parts</span>[<span class="number">1</span>] <span class="op">==</span> <span class="string">&quot;input&quot;</span> {
                <span class="kw">if</span> <span class="ident">data_packs</span>.<span class="ident">input</span>.<span class="ident">contains</span>(<span class="kw-2">&amp;</span><span class="ident">data_pack</span>) {
                    <span class="kw">continue</span>;
                }
            } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">parts</span>[<span class="number">1</span>] <span class="op">==</span> <span class="string">&quot;system&quot;</span> {
                <span class="kw">if</span> <span class="ident">data_packs</span>.<span class="ident">runtime</span>.<span class="ident">contains</span>(<span class="kw-2">&amp;</span><span class="ident">data_pack</span>) {
                    <span class="kw">continue</span>;
                }
            } <span class="kw">else</span> {
                <span class="macro">panic!</span>(<span class="string">&quot;Wait what&#39;s {}&quot;</span>, <span class="ident">path</span>);
            }
            <span class="ident">remove</span>.<span class="ident">push</span>(<span class="ident">path</span>.<span class="ident">clone</span>());
        }
        <span class="kw">for</span> <span class="ident">path</span> <span class="kw">in</span> <span class="ident">remove</span> {
            <span class="self">self</span>.<span class="ident">entries</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">path</span>).<span class="ident">unwrap</span>();
        }
        <span class="self">self</span>
    }

    <span class="doccomment">/// Because there are so many Seattle maps and they get downloaded in one data pack on native,</span>
    <span class="doccomment">/// managing the total file size is important. The &quot;us/seattle&quot; data pack only contains small</span>
    <span class="doccomment">/// maps; the &quot;us/huge_seattle&quot; pack has the rest. This returns true for files belonging to</span>
    <span class="doccomment">/// &quot;us/huge_seattle&quot;.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_file_part_of_huge_seattle</span>(<span class="ident">path</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) -&gt; <span class="ident">bool</span> {
        <span class="kw">let</span> <span class="ident">path</span> <span class="op">=</span> <span class="ident">path</span>
            .<span class="ident">strip_prefix</span>(<span class="kw-2">&amp;</span><span class="ident"><span class="kw">crate</span>::path</span>(<span class="string">&quot;&quot;</span>))
            .<span class="ident">or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">path</span>.<span class="ident">strip_prefix</span>(<span class="string">&quot;data/&quot;</span>))
            .<span class="ident">unwrap_or</span>(<span class="ident">path</span>);
        <span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=</span> <span class="ident">path</span>.<span class="ident">strip_prefix</span>(<span class="string">&quot;system/us/seattle/maps/&quot;</span>) {
            <span class="ident">x</span>.<span class="ident">strip_suffix</span>(<span class="string">&quot;.bin&quot;</span>).<span class="ident">unwrap</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">x</span>) <span class="op">=</span> <span class="ident">path</span>.<span class="ident">strip_prefix</span>(<span class="string">&quot;system/us/seattle/scenarios/&quot;</span>) {
            <span class="ident">x</span>.<span class="ident">split</span>(<span class="string">&#39;/&#39;</span>).<span class="ident">next</span>().<span class="ident">unwrap</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">x</span>) <span class="op">=</span> <span class="ident">path</span>.<span class="ident">strip_prefix</span>(<span class="string">&quot;system/us/seattle/prebaked_results/&quot;</span>) {
            <span class="ident">x</span>.<span class="ident">split</span>(<span class="string">&#39;/&#39;</span>).<span class="ident">next</span>().<span class="ident">unwrap</span>()
        } <span class="kw">else</span> {
            <span class="kw">return</span> <span class="bool-val">false</span>;
        };
        <span class="ident">name</span> <span class="op">==</span> <span class="string">&quot;huge_seattle&quot;</span>
            <span class="op">|</span><span class="op">|</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">&quot;north_seattle&quot;</span>
            <span class="op">|</span><span class="op">|</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">&quot;south_seattle&quot;</span>
            <span class="op">|</span><span class="op">|</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">&quot;west_seattle&quot;</span>
    }

    <span class="doccomment">/// If an entry&#39;s path is system data, return the city.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">path_to_city</span>(<span class="ident">path</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">CityName</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">parts</span> <span class="op">=</span> <span class="ident">path</span>.<span class="ident">split</span>(<span class="string">&#39;/&#39;</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">parts</span>[<span class="number">1</span>] <span class="op">==</span> <span class="string">&quot;system&quot;</span> {
            <span class="kw">if</span> <span class="ident">parts</span>[<span class="number">2</span>] <span class="op">==</span> <span class="string">&quot;assets&quot;</span>
                <span class="op">|</span><span class="op">|</span> <span class="ident">parts</span>[<span class="number">2</span>] <span class="op">==</span> <span class="string">&quot;extra_fonts&quot;</span>
                <span class="op">|</span><span class="op">|</span> <span class="ident">parts</span>[<span class="number">2</span>] <span class="op">==</span> <span class="string">&quot;ltn_proposals&quot;</span>
                <span class="op">|</span><span class="op">|</span> <span class="ident">parts</span>[<span class="number">2</span>] <span class="op">==</span> <span class="string">&quot;proposals&quot;</span>
                <span class="op">|</span><span class="op">|</span> <span class="ident">parts</span>[<span class="number">2</span>] <span class="op">==</span> <span class="string">&quot;study_areas&quot;</span>
            {
                <span class="kw">return</span> <span class="prelude-val">None</span>;
            }
            <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">CityName::new</span>(<span class="ident">parts</span>[<span class="number">2</span>], <span class="ident">parts</span>[<span class="number">3</span>]));
        }
        <span class="prelude-val">None</span>
    }

    <span class="doccomment">/// Look up an entry.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_entry</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">path</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">Entry</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">path</span> <span class="op">=</span> <span class="ident">path</span>.<span class="ident">strip_prefix</span>(<span class="kw-2">&amp;</span><span class="ident"><span class="kw">crate</span>::path</span>(<span class="string">&quot;&quot;</span>)).<span class="ident">unwrap_or</span>(<span class="ident">path</span>);
        <span class="self">self</span>.<span class="ident">entries</span>.<span class="ident">get</span>(<span class="kw-2">&amp;</span><span class="macro">format!</span>(<span class="string">&quot;data/{}&quot;</span>, <span class="ident">path</span>))
    }
}

<span class="doccomment">/// Player-chosen groups of files to opt into downloading</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">DataPacks</span> {
    <span class="doccomment">/// A list of cities to download for using in A/B Street. Expressed the same as</span>
    <span class="doccomment">/// `CityName::to_path`, like &quot;gb/london&quot;.</span>
    <span class="kw">pub</span> <span class="ident">runtime</span>: <span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,
    <span class="doccomment">/// A list of cities to download for running the map importer.</span>
    <span class="kw">pub</span> <span class="ident">input</span>: <span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span> <span class="ident">DataPacks</span> {
    <span class="doccomment">/// Load the player&#39;s config for what files to download, or create the config.</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">pub</span> <span class="kw">fn</span> <span class="ident">load_or_create</span>() -&gt; <span class="ident">DataPacks</span> {
        <span class="kw">let</span> <span class="ident">path</span> <span class="op">=</span> <span class="ident"><span class="kw">crate</span>::path_player</span>(<span class="string">&quot;data.json&quot;</span>);
        <span class="kw">match</span> <span class="ident"><span class="kw">crate</span>::maybe_read_json</span>::<span class="op">&lt;</span><span class="ident">DataPacks</span><span class="op">&gt;</span>(<span class="ident">path</span>.<span class="ident">clone</span>(), <span class="kw-2">&amp;mut</span> <span class="ident">abstutil::Timer::throwaway</span>()) {
            <span class="prelude-val">Ok</span>(<span class="ident">cfg</span>) =&gt; <span class="ident">cfg</span>,
            <span class="prelude-val">Err</span>(<span class="ident">err</span>) =&gt; {
                <span class="macro">warn!</span>(<span class="string">&quot;player/data.json invalid, assuming defaults: {}&quot;</span>, <span class="ident">err</span>);
                <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cfg</span> <span class="op">=</span> <span class="ident">DataPacks</span> {
                    <span class="ident">runtime</span>: <span class="ident">BTreeSet::new</span>(),
                    <span class="ident">input</span>: <span class="ident">BTreeSet::new</span>(),
                };
                <span class="ident">cfg</span>.<span class="ident">runtime</span>.<span class="ident">insert</span>(<span class="string">&quot;us/seattle&quot;</span>.<span class="ident">to_string</span>());
                <span class="ident"><span class="kw">crate</span>::write_json</span>(<span class="ident">path</span>, <span class="kw-2">&amp;</span><span class="ident">cfg</span>);
                <span class="ident">cfg</span>
            }
        }
    }

    <span class="doccomment">/// Saves the player&#39;s config for what files to download.</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">pub</span> <span class="kw">fn</span> <span class="ident">save</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) {
        <span class="ident"><span class="kw">crate</span>::write_json</span>(<span class="ident"><span class="kw">crate</span>::path_player</span>(<span class="string">&quot;data.json&quot;</span>), <span class="self">self</span>);
    }

    <span class="doccomment">/// Fill out all data packs based on the local manifest.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">all_data_packs</span>() -&gt; <span class="ident">DataPacks</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">data_packs</span> <span class="op">=</span> <span class="ident">DataPacks</span> {
            <span class="ident">runtime</span>: <span class="ident">BTreeSet::new</span>(),
            <span class="ident">input</span>: <span class="ident">BTreeSet::new</span>(),
        };
        <span class="kw">for</span> <span class="ident">path</span> <span class="kw">in</span> <span class="ident">Manifest::load</span>().<span class="ident">entries</span>.<span class="ident">keys</span>() {
            <span class="kw">if</span> <span class="ident">path</span>.<span class="ident">starts_with</span>(<span class="string">&quot;data/system/extra_fonts&quot;</span>) <span class="op">|</span><span class="op">|</span> <span class="ident">path</span>.<span class="ident">starts_with</span>(<span class="string">&quot;data/input/shared&quot;</span>)
            {
                <span class="kw">continue</span>;
            }
            <span class="kw">let</span> <span class="ident">parts</span> <span class="op">=</span> <span class="ident">path</span>.<span class="ident">split</span>(<span class="string">&#39;/&#39;</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">let</span> <span class="kw-2">mut</span> <span class="ident">city</span> <span class="op">=</span> <span class="macro">format!</span>(<span class="string">&quot;{}/{}&quot;</span>, <span class="ident">parts</span>[<span class="number">2</span>], <span class="ident">parts</span>[<span class="number">3</span>]);
            <span class="kw">if</span> <span class="ident">Manifest::is_file_part_of_huge_seattle</span>(<span class="ident">path</span>) {
                <span class="ident">city</span> <span class="op">=</span> <span class="string">&quot;us/huge_seattle&quot;</span>.<span class="ident">to_string</span>();
            }
            <span class="kw">if</span> <span class="ident">parts</span>[<span class="number">1</span>] <span class="op">==</span> <span class="string">&quot;input&quot;</span> {
                <span class="ident">data_packs</span>.<span class="ident">input</span>.<span class="ident">insert</span>(<span class="ident">city</span>);
            } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">parts</span>[<span class="number">1</span>] <span class="op">==</span> <span class="string">&quot;system&quot;</span> {
                <span class="ident">data_packs</span>.<span class="ident">runtime</span>.<span class="ident">insert</span>(<span class="ident">city</span>);
            }
        }
        <span class="ident">data_packs</span>
    }
}
</code></pre></div>
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