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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">cmp</span>, <span class="ident">ops</span>};

<span class="kw">use</span> <span class="ident">anyhow</span>::<span class="prelude-ty">Result</span>;
<span class="kw">use</span> <span class="ident">instant</span>::<span class="ident">Instant</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">abstutil</span>::<span class="ident">elapsed_seconds</span>;

<span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">trim_f64</span>, <span class="ident">Distance</span>, <span class="ident">Speed</span>, <span class="ident">UnitFmt</span>};

<span class="doccomment">/// A duration, in seconds. Can be negative.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">PartialOrd</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">Duration</span>(<span class="ident">f64</span>);

<span class="comment">// By construction, Duration is a finite f64 with trimmed precision.</span>
<span class="kw">impl</span> <span class="ident">Eq</span> <span class="kw">for</span> <span class="ident">Duration</span> {}
<span class="kw">impl</span> <span class="ident">Ord</span> <span class="kw">for</span> <span class="ident">Duration</span> {
    <span class="kw">fn</span> <span class="ident">cmp</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">Duration</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">cmp</span>::<span class="ident">Ordering</span> {
        <span class="self">self</span>.<span class="ident">partial_cmp</span>(<span class="ident">other</span>).<span class="ident">unwrap</span>()
    }
}

<span class="kw">impl</span> <span class="ident">Duration</span> {
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">ZERO</span>: <span class="ident">Duration</span> <span class="op">=</span> <span class="ident">Duration</span>::<span class="ident">const_seconds</span>(<span class="number">0.0</span>);
    <span class="kw">const</span> <span class="ident">EPSILON</span>: <span class="ident">Duration</span> <span class="op">=</span> <span class="ident">Duration</span>::<span class="ident">const_seconds</span>(<span class="number">0.0001</span>);

    <span class="doccomment">/// Creates a duration in seconds.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">seconds</span>(<span class="ident">value</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Duration</span> {
        <span class="kw">if</span> <span class="op">!</span><span class="ident">value</span>.<span class="ident">is_finite</span>() {
            <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Bad Duration {}&quot;</span>, <span class="ident">value</span>);
        }

        <span class="ident">Duration</span>(<span class="ident">trim_f64</span>(<span class="ident">value</span>))
    }

    <span class="doccomment">/// Creates a duration in minutes.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">minutes</span>(<span class="ident">mins</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Duration</span> {
        <span class="ident">Duration</span>::<span class="ident">seconds</span>((<span class="ident">mins</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">*</span> <span class="number">60.0</span>)
    }

    <span class="doccomment">/// Creates a duration in hours.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">hours</span>(<span class="ident">hours</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Duration</span> {
        <span class="ident">Duration</span>::<span class="ident">seconds</span>((<span class="ident">hours</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">*</span> <span class="number">3600.0</span>)
    }

    <span class="doccomment">/// Creates a duration in minutes.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">f64_minutes</span>(<span class="ident">mins</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Duration</span> {
        <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="ident">mins</span> <span class="op">*</span> <span class="number">60.0</span>)
    }

    <span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">const_seconds</span>(<span class="ident">value</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Duration</span> {
        <span class="ident">Duration</span>(<span class="ident">value</span>)
    }

    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">to_u64</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">u64</span> {
        (<span class="self">self</span>.<span class="number">0</span> <span class="op">/</span> <span class="ident">Duration</span>::<span class="ident">EPSILON</span>.<span class="number">0</span>) <span class="kw">as</span> <span class="ident">u64</span>
    }

    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">from_u64</span>(<span class="ident">x</span>: <span class="ident">u64</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Duration</span> {
        (<span class="ident">x</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">*</span> <span class="ident">Duration</span>::<span class="ident">EPSILON</span>
    }

    <span class="doccomment">/// Returns the duration in seconds. Prefer working in typesafe `Duration`s.</span>
    <span class="comment">// TODO Remove if possible.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">inner_seconds</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">f64</span> {
        <span class="self">self</span>.<span class="number">0</span>
    }

    <span class="doccomment">/// Splits the duration into (hours, minutes, seconds, centiseconds).</span>
    <span class="comment">// TODO Could share some of this with Time -- the representations are the same</span>
    <span class="kw">fn</span> <span class="ident">get_parts</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> (<span class="ident">usize</span>, <span class="ident">usize</span>, <span class="ident">usize</span>, <span class="ident">usize</span>) {
        <span class="comment">// Force positive</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">remainder</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner_seconds</span>().<span class="ident">abs</span>();
        <span class="kw">let</span> <span class="ident">hours</span> <span class="op">=</span> (<span class="ident">remainder</span> <span class="op">/</span> <span class="number">3600.0</span>).<span class="ident">floor</span>();
        <span class="ident">remainder</span> <span class="op">-</span><span class="op">=</span> <span class="ident">hours</span> <span class="op">*</span> <span class="number">3600.0</span>;
        <span class="kw">let</span> <span class="ident">minutes</span> <span class="op">=</span> (<span class="ident">remainder</span> <span class="op">/</span> <span class="number">60.0</span>).<span class="ident">floor</span>();
        <span class="ident">remainder</span> <span class="op">-</span><span class="op">=</span> <span class="ident">minutes</span> <span class="op">*</span> <span class="number">60.0</span>;
        <span class="kw">let</span> <span class="ident">seconds</span> <span class="op">=</span> <span class="ident">remainder</span>.<span class="ident">floor</span>();
        <span class="ident">remainder</span> <span class="op">-</span><span class="op">=</span> <span class="ident">seconds</span>;
        <span class="kw">let</span> <span class="ident">centis</span> <span class="op">=</span> (<span class="ident">remainder</span> <span class="op">/</span> <span class="number">0.1</span>).<span class="ident">floor</span>();

        (
            <span class="ident">hours</span> <span class="kw">as</span> <span class="ident">usize</span>,
            <span class="ident">minutes</span> <span class="kw">as</span> <span class="ident">usize</span>,
            <span class="ident">seconds</span> <span class="kw">as</span> <span class="ident">usize</span>,
            <span class="ident">centis</span> <span class="kw">as</span> <span class="ident">usize</span>,
        )
    }

    <span class="doccomment">/// Parses a duration such as &quot;3:00&quot; to `Duration::minutes(3)`.</span>
    <span class="comment">// TODO This is NOT the inverse of Display!</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">string</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">Duration</span><span class="op">&gt;</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">string</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">is_empty</span>() {
            <span class="macro">bail</span><span class="macro">!</span>(<span class="string">&quot;Duration {}: no :&#39;s&quot;</span>, <span class="ident">string</span>);
        }

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">seconds</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">0.0</span>;
        <span class="kw">if</span> <span class="ident">parts</span>.<span class="ident">last</span>().<span class="ident">unwrap</span>().<span class="ident">contains</span>(<span class="string">&#39;.&#39;</span>) {
            <span class="kw">let</span> <span class="ident">last_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">parts</span>.<span class="ident">last</span>().<span class="ident">unwrap</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">last_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;Duration {}: no . in last part&quot;</span>, <span class="ident">string</span>);
            }
            <span class="ident">seconds</span> <span class="op">+</span><span class="op">=</span> <span class="ident">last_parts</span>[<span class="number">1</span>].<span class="ident">parse</span>::<span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>()<span class="question-mark">?</span> <span class="op">/</span> <span class="number">10.0</span>;
            <span class="ident">seconds</span> <span class="op">+</span><span class="op">=</span> <span class="ident">last_parts</span>[<span class="number">0</span>].<span class="ident">parse</span>::<span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>()<span class="question-mark">?</span>;
        } <span class="kw">else</span> {
            <span class="ident">seconds</span> <span class="op">+</span><span class="op">=</span> <span class="ident">parts</span>.<span class="ident">last</span>().<span class="ident">unwrap</span>().<span class="ident">parse</span>::<span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>()<span class="question-mark">?</span>;
        }

        <span class="kw">match</span> <span class="ident">parts</span>.<span class="ident">len</span>() {
            <span class="number">1</span> <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="ident">seconds</span>)),
            <span class="number">2</span> <span class="op">=</span><span class="op">&gt;</span> {
                <span class="ident">seconds</span> <span class="op">+</span><span class="op">=</span> <span class="number">60.0</span> <span class="op">*</span> <span class="ident">parts</span>[<span class="number">0</span>].<span class="ident">parse</span>::<span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>()<span class="question-mark">?</span>;
                <span class="prelude-val">Ok</span>(<span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="ident">seconds</span>))
            }
            <span class="number">3</span> <span class="op">=</span><span class="op">&gt;</span> {
                <span class="ident">seconds</span> <span class="op">+</span><span class="op">=</span> <span class="number">60.0</span> <span class="op">*</span> <span class="ident">parts</span>[<span class="number">1</span>].<span class="ident">parse</span>::<span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>()<span class="question-mark">?</span>;
                <span class="ident">seconds</span> <span class="op">+</span><span class="op">=</span> <span class="number">3600.0</span> <span class="op">*</span> <span class="ident">parts</span>[<span class="number">0</span>].<span class="ident">parse</span>::<span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>()<span class="question-mark">?</span>;
                <span class="prelude-val">Ok</span>(<span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="ident">seconds</span>))
            }
            <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> <span class="macro">bail</span><span class="macro">!</span>(<span class="string">&quot;Duration {}: weird number of parts&quot;</span>, <span class="ident">string</span>),
        }
    }

    <span class="doccomment">/// If two durations are within this amount, they&#39;ll print as if they&#39;re the same.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">epsilon_eq</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Duration</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="kw">let</span> <span class="ident">eps</span> <span class="op">=</span> <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="number">0.1</span>);
        <span class="kw">if</span> <span class="self">self</span> <span class="op">&gt;</span> <span class="ident">other</span> {
            <span class="self">self</span> <span class="op">-</span> <span class="ident">other</span> <span class="op">&lt;</span> <span class="ident">eps</span>
        } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span> <span class="op">&lt;</span> <span class="ident">other</span> {
            <span class="ident">other</span> <span class="op">-</span> <span class="self">self</span> <span class="op">&lt;</span> <span class="ident">eps</span>
        } <span class="kw">else</span> {
            <span class="bool-val">true</span>
        }
    }

    <span class="doccomment">/// Returns the duration elapsed from this moment in real time.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">realtime_elapsed</span>(<span class="ident">since</span>: <span class="ident">Instant</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Duration</span> {
        <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="ident">elapsed_seconds</span>(<span class="ident">since</span>))
    }

    <span class="doccomment">/// Rounds a duration up to the nearest whole number multiple.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">round_up</span>(<span class="self">self</span>, <span class="ident">multiple</span>: <span class="ident">Duration</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Duration</span> {
        <span class="kw">let</span> <span class="ident">remainder</span> <span class="op">=</span> <span class="self">self</span> <span class="op">%</span> <span class="ident">multiple</span>;
        <span class="kw">if</span> <span class="ident">remainder</span> <span class="op">=</span><span class="op">=</span> <span class="ident">Duration</span>::<span class="ident">ZERO</span> {
            <span class="self">self</span>
        } <span class="kw">else</span> {
            <span class="self">self</span> <span class="op">+</span> <span class="ident">multiple</span> <span class="op">-</span> <span class="ident">remainder</span>
        }
    }

    <span class="doccomment">/// Returns the duration as a number of minutes, rounded up.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">num_minutes_rounded_up</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">usize</span> {
        <span class="kw">let</span> (<span class="ident">hrs</span>, <span class="ident">mins</span>, <span class="ident">secs</span>, <span class="ident">rem</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_parts</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">mins</span> <span class="op">+</span> <span class="number">60</span> <span class="op">*</span> <span class="ident">hrs</span>;
        <span class="kw">if</span> <span class="ident">secs</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span> <span class="op">|</span><span class="op">|</span> <span class="ident">rem</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span> {
            <span class="ident">result</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
        }
        <span class="ident">result</span>
    }

    <span class="comment">// TODO Do something fancier? http://vis.stanford.edu/papers/tick-labels</span>
    <span class="comment">// TODO Unit test me</span>
    <span class="doccomment">/// Returns (rounded max, the boundaries in number of minutes)</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">make_intervals_for_max</span>(<span class="self">self</span>, <span class="ident">num_labels</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> (<span class="ident">Duration</span>, <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>) {
        <span class="comment">// Example 1: 43 minutes, max 5 labels... raw_mins_per_interval is 8.6</span>
        <span class="kw">let</span> <span class="ident">raw_mins_per_interval</span> <span class="op">=</span> (<span class="self">self</span>.<span class="ident">num_minutes_rounded_up</span>() <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">/</span> (<span class="ident">num_labels</span> <span class="kw">as</span> <span class="ident">f64</span>);
        <span class="comment">// So then this rounded up to 10 minutes</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">mins_per_interval</span> <span class="op">=</span> <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="number">60.0</span> <span class="op">*</span> <span class="ident">raw_mins_per_interval</span>)
            .<span class="ident">round_up</span>(<span class="ident">Duration</span>::<span class="ident">minutes</span>(<span class="number">5</span>))
            .<span class="ident">num_minutes_rounded_up</span>();

        <span class="comment">// Example 2: 8 minutes, max 5 labels... raw_mins_per_interval is 1.6</span>
        <span class="comment">// If we&#39;re under 25 minutes, this is going to be weird.</span>
        <span class="kw">if</span> <span class="self">self</span> <span class="op">&lt;</span> (<span class="ident">num_labels</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">*</span> <span class="ident">Duration</span>::<span class="ident">minutes</span>(<span class="number">5</span>) {
            <span class="comment">// rounded up to 5 mins? 1 min increments</span>
            <span class="comment">// up to 10? 2 min increments</span>
            <span class="comment">// up to 15? 3</span>
            <span class="comment">// up to 20? 4</span>
            <span class="comment">// then after that the normal behavior</span>
            <span class="ident">mins_per_interval</span> <span class="op">=</span> (<span class="self">self</span>.<span class="ident">round_up</span>(<span class="ident">Duration</span>::<span class="ident">minutes</span>(<span class="number">5</span>)) <span class="op">/</span> (<span class="ident">num_labels</span> <span class="kw">as</span> <span class="ident">f64</span>))
                .<span class="ident">num_minutes_rounded_up</span>();
        }

        <span class="kw">let</span> <span class="ident">max</span> <span class="op">=</span> (<span class="ident">num_labels</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">*</span> <span class="ident">Duration</span>::<span class="ident">minutes</span>(<span class="ident">mins_per_interval</span>);
        <span class="kw">let</span> <span class="ident">labels</span> <span class="op">=</span> (<span class="number">0</span>..<span class="op">=</span><span class="ident">num_labels</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> <span class="ident">i</span> <span class="op">*</span> <span class="ident">mins_per_interval</span>).<span class="ident">collect</span>();

        <span class="kw">if</span> <span class="ident">max</span> <span class="op">&lt;</span> <span class="self">self</span> {
            <span class="macro">panic</span><span class="macro">!</span>(
                <span class="string">&quot;Wait max of {} with {} labels wound up with rounded max of {}&quot;</span>,
                <span class="self">self</span>, <span class="ident">num_labels</span>, <span class="ident">max</span>
            );
        }
        (<span class="ident">max</span>, <span class="ident">labels</span>)
    }

    <span class="doccomment">/// Describes the duration according to formatting rules.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_string</span>(<span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&amp;</span><span class="ident">UnitFmt</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">String</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
        <span class="kw">if</span> <span class="self">self</span> <span class="op">&lt;</span> <span class="ident">Duration</span>::<span class="ident">ZERO</span> {
            <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;-&quot;</span>.<span class="ident">to_string</span>();
        }
        <span class="kw">let</span> (<span class="ident">hours</span>, <span class="ident">minutes</span>, <span class="ident">seconds</span>, <span class="ident">remainder</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_parts</span>();
        <span class="kw">if</span> <span class="ident">hours</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> <span class="op">&amp;&amp;</span> <span class="ident">minutes</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> <span class="op">&amp;&amp;</span> <span class="ident">seconds</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> <span class="op">&amp;&amp;</span> <span class="ident">remainder</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
            <span class="kw">return</span> <span class="string">&quot;0s&quot;</span>.<span class="ident">to_string</span>();
        }

        <span class="kw">if</span> <span class="ident">hours</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span> {
            <span class="ident">s</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}{}h&quot;</span>, <span class="ident">s</span>, <span class="ident">hours</span>);
        }
        <span class="kw">if</span> <span class="ident">hours</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span> <span class="op">|</span><span class="op">|</span> <span class="ident">minutes</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span> {
            <span class="ident">s</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}{}m&quot;</span>, <span class="ident">s</span>, <span class="ident">minutes</span>);
        }
        <span class="kw">if</span> <span class="ident">remainder</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span> {
            <span class="kw">if</span> <span class="ident">fmt</span>.<span class="ident">round_durations</span> {
                <span class="ident">s</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}{}s&quot;</span>, <span class="ident">s</span>, <span class="ident">seconds</span>);
            } <span class="kw">else</span> {
                <span class="ident">s</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}{}.{:01}s&quot;</span>, <span class="ident">s</span>, <span class="ident">seconds</span>, <span class="ident">remainder</span>);
            }
        } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">seconds</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span> {
            <span class="ident">s</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}{}s&quot;</span>, <span class="ident">s</span>, <span class="ident">seconds</span>);
        }
        <span class="ident">s</span>
    }
}

<span class="kw">impl</span> <span class="ident">std</span>::<span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Duration</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">std</span>::<span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">std</span>::<span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="macro">write</span><span class="macro">!</span>(
            <span class="ident">f</span>,
            <span class="string">&quot;{}&quot;</span>,
            (<span class="kw-2">*</span><span class="self">self</span>).<span class="ident">to_string</span>(<span class="kw-2">&amp;</span><span class="ident">UnitFmt</span> {
                <span class="ident">metric</span>: <span class="bool-val">false</span>,
                <span class="ident">round_durations</span>: <span class="bool-val">false</span>
            })
        )
    }
}

<span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">Add</span> <span class="kw">for</span> <span class="ident">Duration</span> {
    <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Duration</span>;

    <span class="kw">fn</span> <span class="ident">add</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Duration</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Duration</span> {
        <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="self">self</span>.<span class="number">0</span> <span class="op">+</span> <span class="ident">other</span>.<span class="number">0</span>)
    }
}

<span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">AddAssign</span> <span class="kw">for</span> <span class="ident">Duration</span> {
    <span class="kw">fn</span> <span class="ident">add_assign</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Duration</span>) {
        <span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span> <span class="op">+</span> <span class="ident">other</span>;
    }
}

<span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">SubAssign</span> <span class="kw">for</span> <span class="ident">Duration</span> {
    <span class="kw">fn</span> <span class="ident">sub_assign</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Duration</span>) {
        <span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span> <span class="op">-</span> <span class="ident">other</span>;
    }
}

<span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">Sub</span> <span class="kw">for</span> <span class="ident">Duration</span> {
    <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Duration</span>;

    <span class="kw">fn</span> <span class="ident">sub</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Duration</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Duration</span> {
        <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="self">self</span>.<span class="number">0</span> <span class="op">-</span> <span class="ident">other</span>.<span class="number">0</span>)
    }
}

<span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">Mul</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Duration</span> {
    <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Duration</span>;

    <span class="kw">fn</span> <span class="ident">mul</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Duration</span> {
        <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="self">self</span>.<span class="number">0</span> <span class="op">*</span> <span class="ident">other</span>)
    }
}

<span class="comment">// TODO Both of these work. Use a macro or crate to define both, so we don&#39;t have to worry about</span>
<span class="comment">// order for commutative things like multiplication. :P</span>
<span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">Mul</span><span class="op">&lt;</span><span class="ident">Duration</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">f64</span> {
    <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Duration</span>;

    <span class="kw">fn</span> <span class="ident">mul</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Duration</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Duration</span> {
        <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="self">self</span> <span class="op">*</span> <span class="ident">other</span>.<span class="number">0</span>)
    }
}

<span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">Mul</span><span class="op">&lt;</span><span class="ident">Speed</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Duration</span> {
    <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Distance</span>;

    <span class="kw">fn</span> <span class="ident">mul</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Speed</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Distance</span> {
        <span class="ident">Distance</span>::<span class="ident">meters</span>(<span class="self">self</span>.<span class="number">0</span> <span class="op">*</span> <span class="ident">other</span>.<span class="ident">inner_meters_per_second</span>())
    }
}

<span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">Div</span><span class="op">&lt;</span><span class="ident">Duration</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Duration</span> {
    <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">f64</span>;

    <span class="kw">fn</span> <span class="ident">div</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Duration</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">f64</span> {
        <span class="kw">if</span> <span class="ident">other</span>.<span class="number">0</span> <span class="op">=</span><span class="op">=</span> <span class="number">0.0</span> {
            <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Can&#39;t divide {} / {}&quot;</span>, <span class="self">self</span>, <span class="ident">other</span>);
        }
        <span class="self">self</span>.<span class="number">0</span> <span class="op">/</span> <span class="ident">other</span>.<span class="number">0</span>
    }
}

<span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">Div</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Duration</span> {
    <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Duration</span>;

    <span class="kw">fn</span> <span class="ident">div</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Duration</span> {
        <span class="kw">if</span> <span class="ident">other</span> <span class="op">=</span><span class="op">=</span> <span class="number">0.0</span> {
            <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Can&#39;t divide {} / {}&quot;</span>, <span class="self">self</span>, <span class="ident">other</span>);
        }
        <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="self">self</span>.<span class="number">0</span> <span class="op">/</span> <span class="ident">other</span>)
    }
}

<span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">Rem</span><span class="op">&lt;</span><span class="ident">Duration</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Duration</span> {
    <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Duration</span>;

    <span class="kw">fn</span> <span class="ident">rem</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Duration</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Duration</span> {
        <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="self">self</span>.<span class="number">0</span> <span class="op">%</span> <span class="ident">other</span>.<span class="number">0</span>)
    }
}

<span class="kw">impl</span> <span class="ident">std</span>::<span class="ident">iter</span>::<span class="ident">Sum</span> <span class="kw">for</span> <span class="ident">Duration</span> {
    <span class="kw">fn</span> <span class="ident">sum</span><span class="op">&lt;</span><span class="ident">I</span><span class="op">&gt;</span>(<span class="ident">iter</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Duration</span>
    <span class="kw">where</span>
        <span class="ident">I</span>: <span class="ident">Iterator</span><span class="op">&lt;</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">Duration</span><span class="op">&gt;</span>,
    {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">sum</span> <span class="op">=</span> <span class="ident">Duration</span>::<span class="ident">ZERO</span>;
        <span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="ident">iter</span> {
            <span class="ident">sum</span> <span class="op">+</span><span class="op">=</span> <span class="ident">x</span>;
        }
        <span class="ident">sum</span>
    }
}

<span class="kw">impl</span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">Duration</span> {
    <span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Duration</span> {
        <span class="ident">Duration</span>::<span class="ident">ZERO</span>
    }
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
    <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">print_durations</span>() {
        <span class="kw">let</span> <span class="ident">dont_round</span> <span class="op">=</span> <span class="ident">UnitFmt</span> {
            <span class="ident">metric</span>: <span class="bool-val">false</span>,
            <span class="ident">round_durations</span>: <span class="bool-val">false</span>,
        };
        <span class="kw">let</span> <span class="ident">round</span> <span class="op">=</span> <span class="ident">UnitFmt</span> {
            <span class="ident">metric</span>: <span class="bool-val">false</span>,
            <span class="ident">round_durations</span>: <span class="bool-val">true</span>,
        };

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;0s&quot;</span>, <span class="ident">Duration</span>::<span class="ident">ZERO</span>.<span class="ident">to_string</span>(<span class="kw-2">&amp;</span><span class="ident">dont_round</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;0s&quot;</span>, <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="number">0.001</span>).<span class="ident">to_string</span>(<span class="kw-2">&amp;</span><span class="ident">dont_round</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;1m30.1s&quot;</span>, <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="number">90.123</span>).<span class="ident">to_string</span>(<span class="kw-2">&amp;</span><span class="ident">dont_round</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;1m30s&quot;</span>, <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="number">90.123</span>).<span class="ident">to_string</span>(<span class="kw-2">&amp;</span><span class="ident">round</span>));
    }
}
</pre></div>
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