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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">//! Generate paths for different A/B Street files</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="kw">crate</span>::{<span class="ident">basename</span>, <span class="ident">file_exists</span>, <span class="ident">list_all_objects</span>};

<span class="ident">lazy_static</span>::<span class="macro">lazy_static</span><span class="macro">!</span> {
    <span class="kw">static</span> <span class="kw-2">ref</span> <span class="ident">ROOT_DIR</span>: <span class="ident">String</span> <span class="op">=</span> {
        <span class="comment">// If you&#39;re packaging for a release and need the data directory to be in some fixed</span>
        <span class="comment">// location: ABST_DATA_DIR=/some/path cargo build ...</span>
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">dir</span>) <span class="op">=</span> <span class="macro">option_env</span><span class="macro">!</span>(<span class="string">&quot;ABST_DATA_DIR&quot;</span>) {
            <span class="ident">dir</span>.<span class="ident">trim_end_matches</span>(<span class="string">&#39;/&#39;</span>).<span class="ident">to_string</span>()
        } <span class="kw">else</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="string">&quot;../data&quot;</span>.<span class="ident">to_string</span>()
        } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">file_exists</span>(<span class="string">&quot;data/&quot;</span>.<span class="ident">to_string</span>()) {
            <span class="string">&quot;data&quot;</span>.<span class="ident">to_string</span>()
        } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">file_exists</span>(<span class="string">&quot;../data/&quot;</span>.<span class="ident">to_string</span>()) {
            <span class="string">&quot;../data&quot;</span>.<span class="ident">to_string</span>()
        } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">file_exists</span>(<span class="string">&quot;../../data/&quot;</span>.<span class="ident">to_string</span>()) {
            <span class="string">&quot;../../data&quot;</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;Can&#39;t find the data/ directory&quot;</span>);
        }
    };

    <span class="kw">static</span> <span class="kw-2">ref</span> <span class="ident">ROOT_PLAYER_DIR</span>: <span class="ident">String</span> <span class="op">=</span> {
        <span class="comment">// If you&#39;re packaging for a release and want the player&#39;s local data directory to be</span>
        <span class="comment">// $HOME/.abstreet, set ABST_PLAYER_HOME_DIR=1</span>
        <span class="kw">if</span> <span class="macro">option_env</span><span class="macro">!</span>(<span class="string">&quot;ABST_PLAYER_HOME_DIR&quot;</span>).<span class="ident">is_some</span>() {
            <span class="kw">match</span> <span class="ident">std</span>::<span class="ident">env</span>::<span class="ident">var</span>(<span class="string">&quot;HOME&quot;</span>) {
                <span class="prelude-val">Ok</span>(<span class="ident">dir</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}/.abstreet&quot;</span>, <span class="ident">dir</span>.<span class="ident">trim_end_matches</span>(<span class="string">&#39;/&#39;</span>)),
                <span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;This build of A/B Street stores player data in $HOME/.abstreet, but $HOME isn&#39;t set: {}&quot;</span>, <span class="ident">err</span>),
            }
        } <span class="kw">else</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="string">&quot;../data&quot;</span>.<span class="ident">to_string</span>()
        } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">file_exists</span>(<span class="string">&quot;data/&quot;</span>.<span class="ident">to_string</span>()) {
            <span class="string">&quot;data&quot;</span>.<span class="ident">to_string</span>()
        } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">file_exists</span>(<span class="string">&quot;../data/&quot;</span>.<span class="ident">to_string</span>()) {
            <span class="string">&quot;../data&quot;</span>.<span class="ident">to_string</span>()
        } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">file_exists</span>(<span class="string">&quot;../../data/&quot;</span>.<span class="ident">to_string</span>()) {
            <span class="string">&quot;../../data&quot;</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;Can&#39;t find the data/ directory&quot;</span>);
        }
    };
}

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">path</span><span class="op">&lt;</span><span class="ident">I</span>: <span class="ident">Into</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="ident">p</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">String</span> {
    <span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">p</span>.<span class="ident">into</span>();
    <span class="kw">if</span> <span class="ident">p</span>.<span class="ident">starts_with</span>(<span class="string">&quot;player/&quot;</span>) {
        <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}/{}&quot;</span>, <span class="kw-2">*</span><span class="ident">ROOT_PLAYER_DIR</span>, <span class="ident">p</span>)
    } <span class="kw">else</span> {
        <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}/{}&quot;</span>, <span class="kw-2">*</span><span class="ident">ROOT_DIR</span>, <span class="ident">p</span>)
    }
}

<span class="doccomment">/// A single map is identified using this. Using a struct makes refactoring later easier, to</span>
<span class="doccomment">/// organize cities hierarchially.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">PartialOrd</span>, <span class="ident">Ord</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">MapName</span> {
    <span class="doccomment">/// The name of the city, in filename-friendly form -- for example, &quot;tel_aviv&quot;. In the future,</span>
    <span class="doccomment">/// this field may change to express more geographic hierarchy.</span>
    <span class="kw">pub</span> <span class="ident">city</span>: <span class="ident">String</span>,
    <span class="doccomment">/// The name of the map within the city, in filename-friendly form -- for example, &quot;downtown&quot;</span>
    <span class="kw">pub</span> <span class="ident">map</span>: <span class="ident">String</span>,
}

<span class="kw">impl</span> <span class="ident">MapName</span> {
    <span class="doccomment">/// Create a MapName from a simple city and map name.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">city</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">MapName</span> {
        <span class="ident">MapName</span> {
            <span class="ident">city</span>: <span class="ident">city</span>.<span class="ident">to_string</span>(),
            <span class="ident">map</span>: <span class="ident">map</span>.<span class="ident">to_string</span>(),
        }
    }

    <span class="doccomment">/// Convenient constructor for the main city of the game.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">seattle</span>(<span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">MapName</span> {
        <span class="ident">MapName</span>::<span class="ident">new</span>(<span class="string">&quot;seattle&quot;</span>, <span class="ident">map</span>)
    }

    <span class="doccomment">/// Stringify the map name for debug messages. Don&#39;t implement `std::fmt::Display`, to force</span>
    <span class="doccomment">/// callers to explicitly opt into this description, which could change.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">describe</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">String</span> {
        <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{} (in {})&quot;</span>, <span class="self">self</span>.<span class="ident">map</span>, <span class="self">self</span>.<span class="ident">city</span>)
    }

    <span class="doccomment">/// Stringify the map name for filenames.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_filename</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">String</span> {
        <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}_{}&quot;</span>, <span class="self">self</span>.<span class="ident">city</span>, <span class="self">self</span>.<span class="ident">map</span>)
    }

    <span class="doccomment">/// Transforms a path to a map back to a MapName. Crashes if the input is strange.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_path</span>(<span class="ident">path</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">MapName</span> {
        <span class="comment">// TODO regex</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">&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">let</span> <span class="ident">city</span> <span class="op">=</span> <span class="ident">parts</span>[<span class="ident">parts</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">3</span>];
        <span class="kw">let</span> <span class="ident">map</span> <span class="op">=</span> <span class="ident">basename</span>(<span class="ident">parts</span>[<span class="ident">parts</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span>]);
        <span class="ident">MapName</span>::<span class="ident">new</span>(<span class="ident">city</span>, <span class="kw-2">&amp;</span><span class="ident">map</span>)
    }

    <span class="doccomment">/// Returns the filesystem path to this map.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">path</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">String</span> {
        <span class="ident">path</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;system/{}/maps/{}.bin&quot;</span>, <span class="self">self</span>.<span class="ident">city</span>, <span class="self">self</span>.<span class="ident">map</span>))
    }

    <span class="doccomment">/// Returns all maps from all cities.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">list_all_maps</span>() <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">MapName</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">names</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
        <span class="kw">for</span> <span class="ident">city</span> <span class="kw">in</span> <span class="ident">list_all_objects</span>(<span class="ident">path</span>(<span class="string">&quot;system&quot;</span>)) {
            <span class="kw">if</span> <span class="ident">city</span> <span class="op">=</span><span class="op">=</span> <span class="string">&quot;assets&quot;</span> <span class="op">|</span><span class="op">|</span> <span class="ident">city</span> <span class="op">=</span><span class="op">=</span> <span class="string">&quot;proposals&quot;</span> {
                <span class="kw">continue</span>;
            }
            <span class="kw">for</span> <span class="ident">map</span> <span class="kw">in</span> <span class="ident">list_all_objects</span>(<span class="ident">path</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;system/{}/maps&quot;</span>, <span class="ident">city</span>))) {
                <span class="ident">names</span>.<span class="ident">push</span>(<span class="ident">MapName</span>::<span class="ident">new</span>(<span class="kw-2">&amp;</span><span class="ident">city</span>, <span class="kw-2">&amp;</span><span class="ident">map</span>));
            }
        }
        <span class="ident">names</span>
    }
}

<span class="comment">// System data (Players can&#39;t edit, needed at runtime)</span>

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">path_prebaked_results</span>(<span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">MapName</span>, <span class="ident">scenario_name</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="ident">path</span>(<span class="macro">format</span><span class="macro">!</span>(
        <span class="string">&quot;system/{}/prebaked_results/{}/{}.bin&quot;</span>,
        <span class="ident">name</span>.<span class="ident">city</span>, <span class="ident">name</span>.<span class="ident">map</span>, <span class="ident">scenario_name</span>
    ))
}

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">path_scenario</span>(<span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">MapName</span>, <span class="ident">scenario_name</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="comment">// TODO Getting complicated. Sometimes we&#39;re trying to load, so we should look for .bin, then</span>
    <span class="comment">// .json. But when we&#39;re writing a custom scenario, we actually want to write a .bin.</span>
    <span class="kw">let</span> <span class="ident">bin</span> <span class="op">=</span> <span class="ident">path</span>(<span class="macro">format</span><span class="macro">!</span>(
        <span class="string">&quot;system/{}/scenarios/{}/{}.bin&quot;</span>,
        <span class="ident">name</span>.<span class="ident">city</span>, <span class="ident">name</span>.<span class="ident">map</span>, <span class="ident">scenario_name</span>
    ));
    <span class="kw">let</span> <span class="ident">json</span> <span class="op">=</span> <span class="ident">path</span>(<span class="macro">format</span><span class="macro">!</span>(
        <span class="string">&quot;system/{}/scenarios/{}/{}.json&quot;</span>,
        <span class="ident">name</span>.<span class="ident">city</span>, <span class="ident">name</span>.<span class="ident">map</span>, <span class="ident">scenario_name</span>
    ));
    <span class="kw">if</span> <span class="ident">file_exists</span>(<span class="kw-2">&amp;</span><span class="ident">bin</span>) {
        <span class="kw">return</span> <span class="ident">bin</span>;
    }
    <span class="kw">if</span> <span class="ident">file_exists</span>(<span class="kw-2">&amp;</span><span class="ident">json</span>) {
        <span class="kw">return</span> <span class="ident">json</span>;
    }
    <span class="ident">bin</span>
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">path_all_scenarios</span>(<span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">MapName</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">String</span> {
    <span class="ident">path</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;system/{}/scenarios/{}&quot;</span>, <span class="ident">name</span>.<span class="ident">city</span>, <span class="ident">name</span>.<span class="ident">map</span>))
}

<span class="doccomment">/// Extract the map and scenario name from a path. Crashes if the input is strange.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_scenario_path</span>(<span class="ident">path</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> (<span class="ident">MapName</span>, <span class="ident">String</span>) {
    <span class="comment">// TODO regex</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">&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">let</span> <span class="ident">city</span> <span class="op">=</span> <span class="ident">parts</span>[<span class="ident">parts</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">4</span>];
    <span class="kw">let</span> <span class="ident">map</span> <span class="op">=</span> <span class="ident">parts</span>[<span class="ident">parts</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">2</span>];
    <span class="kw">let</span> <span class="ident">scenario</span> <span class="op">=</span> <span class="ident">basename</span>(<span class="ident">parts</span>[<span class="ident">parts</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span>]);
    <span class="kw">let</span> <span class="ident">map_name</span> <span class="op">=</span> <span class="ident">MapName</span>::<span class="ident">new</span>(<span class="ident">city</span>, <span class="ident">map</span>);
    (<span class="ident">map_name</span>, <span class="ident">scenario</span>)
}

<span class="comment">// Player data (Players edit this)</span>

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">path_player</span><span class="op">&lt;</span><span class="ident">I</span>: <span class="ident">Into</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="ident">p</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">String</span> {
    <span class="ident">path</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;player/{}&quot;</span>, <span class="ident">p</span>.<span class="ident">into</span>()))
}

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">path_camera_state</span>(<span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">MapName</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">String</span> {
    <span class="ident">path</span>(<span class="macro">format</span><span class="macro">!</span>(
        <span class="string">&quot;player/camera_state/{}/{}.json&quot;</span>,
        <span class="ident">name</span>.<span class="ident">city</span>, <span class="ident">name</span>.<span class="ident">map</span>
    ))
}

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">path_edits</span>(<span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">MapName</span>, <span class="ident">edits_name</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="ident">path</span>(<span class="macro">format</span><span class="macro">!</span>(
        <span class="string">&quot;player/edits/{}/{}/{}.json&quot;</span>,
        <span class="ident">name</span>.<span class="ident">city</span>, <span class="ident">name</span>.<span class="ident">map</span>, <span class="ident">edits_name</span>
    ))
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">path_all_edits</span>(<span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">MapName</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">String</span> {
    <span class="ident">path</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;player/edits/{}/{}&quot;</span>, <span class="ident">name</span>.<span class="ident">city</span>, <span class="ident">name</span>.<span class="ident">map</span>))
}

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">path_save</span>(<span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">MapName</span>, <span class="ident">edits_name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">run_name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">time</span>: <span class="ident">String</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">String</span> {
    <span class="ident">path</span>(<span class="macro">format</span><span class="macro">!</span>(
        <span class="string">&quot;player/saves/{}/{}/{}_{}/{}.bin&quot;</span>,
        <span class="ident">name</span>.<span class="ident">city</span>, <span class="ident">name</span>.<span class="ident">map</span>, <span class="ident">edits_name</span>, <span class="ident">run_name</span>, <span class="ident">time</span>
    ))
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">path_all_saves</span>(<span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">MapName</span>, <span class="ident">edits_name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">run_name</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="ident">path</span>(<span class="macro">format</span><span class="macro">!</span>(
        <span class="string">&quot;player/saves/{}/{}/{}_{}&quot;</span>,
        <span class="ident">name</span>.<span class="ident">city</span>, <span class="ident">name</span>.<span class="ident">map</span>, <span class="ident">edits_name</span>, <span class="ident">run_name</span>
    ))
}

<span class="comment">// Input data (For developers to build maps, not needed at runtime)</span>

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">path_popdat</span>() <span class="op">-</span><span class="op">&gt;</span> <span class="ident">String</span> {
    <span class="ident">path</span>(<span class="string">&quot;input/seattle/popdat.bin&quot;</span>)
}

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">path_raw_map</span>(<span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">MapName</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">String</span> {
    <span class="ident">path</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;input/{}/raw_maps/{}.bin&quot;</span>, <span class="ident">name</span>.<span class="ident">city</span>, <span class="ident">name</span>.<span class="ident">map</span>))
}
</pre></div>
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