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</pre><pre class="rust ">
<span class="doccomment">//! # log</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Initializes the global logger.</span>
<span class="doccomment">//!</span>

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;./logger_test.rs&quot;</span>]</span>
<span class="kw">mod</span> <span class="ident">logger_test</span>;

<span class="kw">use</span> <span class="ident">fern</span>;
<span class="kw">use</span> <span class="ident">log</span>::{<span class="ident">LogLevel</span>, <span class="ident">LogLevelFilter</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">stdout</span>;

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">fn</span> <span class="ident">exit</span>(<span class="ident">code</span>: <span class="ident">i32</span>) {
    <span class="macro">panic</span><span class="macro">!</span>(<span class="ident">code</span>);
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">test</span>))]</span>
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">process</span>::<span class="ident">exit</span>;

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span>
<span class="doccomment">/// The log levels</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Level</span> {
    <span class="ident">VERBOSE</span>,
    <span class="ident">INFO</span>,
    <span class="ident">ERROR</span>
}

<span class="kw">fn</span> <span class="ident">get_level</span>(<span class="ident">level_name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="ident">Level</span> {
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">level</span> <span class="op">=</span> <span class="ident">Level</span>::<span class="ident">INFO</span>;

    <span class="kw">if</span> <span class="ident">level_name</span> <span class="op">==</span> <span class="string">&quot;verbose&quot;</span> {
        <span class="ident">level</span> <span class="op">=</span> <span class="ident">Level</span>::<span class="ident">VERBOSE</span>;
    } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">level_name</span> <span class="op">==</span> <span class="string">&quot;error&quot;</span> {
        <span class="ident">level</span> <span class="op">=</span> <span class="ident">Level</span>::<span class="ident">ERROR</span>;
    }

    <span class="ident">level</span>
}

<span class="doccomment">/// Initializes the global logger.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Arguments</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * `level_name` - The log level name (&#39;verbose&#39;, &#39;info&#39;, &#39;error&#39;)</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">init</span>(<span class="ident">level_name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) {
    <span class="kw">let</span> <span class="ident">level</span> <span class="op">=</span> <span class="ident">get_level</span>(<span class="ident">level_name</span>);

    <span class="kw">let</span> <span class="ident">log_level</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">level</span> {
        <span class="ident">Level</span>::<span class="ident">VERBOSE</span> <span class="op">=&gt;</span> <span class="ident">LogLevelFilter</span>::<span class="ident">Trace</span>,
        <span class="ident">Level</span>::<span class="ident">INFO</span> <span class="op">=&gt;</span> <span class="ident">LogLevelFilter</span>::<span class="ident">Info</span>,
        <span class="ident">Level</span>::<span class="ident">ERROR</span> <span class="op">=&gt;</span> <span class="ident">LogLevelFilter</span>::<span class="ident">Error</span>,
    };

    <span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">fern</span>::<span class="ident">Dispatch</span>::<span class="ident">new</span>()
        .<span class="ident">format</span>(<span class="op">|</span><span class="ident">out</span>, <span class="ident">message</span>, <span class="ident">record</span><span class="op">|</span> {
            <span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="macro">env</span><span class="macro">!</span>(<span class="string">&quot;CARGO_PKG_NAME&quot;</span>);
            <span class="kw">let</span> <span class="ident">record_level</span> <span class="op">=</span> <span class="ident">record</span>.<span class="ident">level</span>();
            <span class="ident">out</span>.<span class="ident">finish</span>(<span class="macro">format_args</span><span class="macro">!</span>(<span class="string">&quot;[{}] {} - {}&quot;</span>, <span class="kw-2">&amp;</span><span class="ident">name</span>, <span class="ident">record_level</span>, <span class="ident">message</span>));

            <span class="kw">if</span> <span class="ident">record_level</span> <span class="op">==</span> <span class="ident">LogLevel</span>::<span class="ident">Error</span> {
                <span class="macro">warn</span><span class="macro">!</span>(<span class="string">&quot;Build Failed.&quot;</span>);

                <span class="ident">exit</span>(<span class="number">0</span>);
            }
        })
        .<span class="ident">level</span>(<span class="ident">log_level</span>)
        .<span class="ident">chain</span>(<span class="ident">stdout</span>())
        .<span class="ident">apply</span>();

    <span class="kw">if</span> <span class="ident">result</span>.<span class="ident">is_err</span>() {
        <span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;Unable to setup logger.&quot;</span>);
    }
}
</pre>
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