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<title>env_logger::fmt::Style - Rust</title>
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<p class='location'>Struct Style</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.set_color">set_color</a><a href="#method.set_bold">set_bold</a><a href="#method.set_intense">set_intense</a><a href="#method.set_bg">set_bg</a><a href="#method.value">value</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Clone">Clone</a><a href="#impl-Debug">Debug</a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-Send">!Send</a><a href="#impl-Sync">!Sync</a></div></div><p class='location'><a href='../index.html'>env_logger</a>::<wbr><a href='index.html'>fmt</a></p><script>window.sidebarCurrent = {name: 'Style', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<section id='main' class="content"><h1 class='fqn'><span class='in-band'>Struct <a href='../index.html'>env_logger</a>::<wbr><a href='index.html'>fmt</a>::<wbr><a class="struct" href=''>Style</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../../src/env_logger/fmt.rs.html#127-130' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust struct'>pub struct Style { /* fields omitted */ }</pre></div><div class='docblock'><p>A set of styles to apply to the terminal output.</p>
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<p>Call <a href="struct.Formatter.html#method.style"><code>Formatter::style</code></a> to get a <code>Style</code> and use the builder methods to
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set styling properties, like <a href="#method.set_color">color</a> and <a href="#method.set_bold">weight</a>.
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To print a value using the style, wrap it in a call to <a href="#method.value"><code>value</code></a> when the log
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record is formatted.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<p>Create a bold, red colored style and use it to print the log level:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Write</span>;
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<span class="kw">use</span> <span class="ident">env_logger</span>::<span class="ident">fmt</span>::<span class="ident">Color</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">builder</span> <span class="op">=</span> <span class="ident">env_logger</span>::<span class="ident">Builder</span>::<span class="ident">new</span>();
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<span class="ident">builder</span>.<span class="ident">format</span>(<span class="op">|</span><span class="ident">buf</span>, <span class="ident">record</span><span class="op">|</span> {
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">level_style</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">style</span>();
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<span class="ident">level_style</span>.<span class="ident">set_color</span>(<span class="ident">Color</span>::<span class="ident">Red</span>).<span class="ident">set_bold</span>(<span class="bool-val">true</span>);
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<span class="macro">writeln</span><span class="macro">!</span>(<span class="ident">buf</span>, <span class="string">"{}: {}"</span>,
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<span class="ident">level_style</span>.<span class="ident">value</span>(<span class="ident">record</span>.<span class="ident">level</span>()),
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<span class="ident">record</span>.<span class="ident">args</span>())
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});</pre>
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<p>Styles can be re-used to output multiple values:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Write</span>;
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<span class="kw">use</span> <span class="ident">env_logger</span>::<span class="ident">fmt</span>::<span class="ident">Color</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">builder</span> <span class="op">=</span> <span class="ident">env_logger</span>::<span class="ident">Builder</span>::<span class="ident">new</span>();
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<span class="ident">builder</span>.<span class="ident">format</span>(<span class="op">|</span><span class="ident">buf</span>, <span class="ident">record</span><span class="op">|</span> {
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bold</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">style</span>();
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<span class="ident">bold</span>.<span class="ident">set_bold</span>(<span class="bool-val">true</span>);
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<span class="macro">writeln</span><span class="macro">!</span>(<span class="ident">buf</span>, <span class="string">"{}: {} {}"</span>,
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<span class="ident">bold</span>.<span class="ident">value</span>(<span class="ident">record</span>.<span class="ident">level</span>()),
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<span class="ident">bold</span>.<span class="ident">value</span>(<span class="string">"some bold text"</span>),
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<span class="ident">record</span>.<span class="ident">args</span>())
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});</pre>
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</div>
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<h2 id='methods' class='small-section-header'>
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Methods<a href='#methods' class='anchor'></a>
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</h2>
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<h3 id='impl' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="struct" href="../../env_logger/fmt/struct.Style.html" title="struct env_logger::fmt::Style">Style</a></code><a href='#impl' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/env_logger/fmt.rs.html#268-403' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.set_color' class="method"><span id='set_color.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.set_color' class='fnname'>set_color</a>(&mut self, color: <a class="enum" href="../../env_logger/fmt/enum.Color.html" title="enum env_logger::fmt::Color">Color</a>) -> &mut <a class="struct" href="../../env_logger/fmt/struct.Style.html" title="struct env_logger::fmt::Style">Style</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/env_logger/fmt.rs.html#289-292' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Set the text color.</p>
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<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
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<p>Create a style with red text:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Write</span>;
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<span class="kw">use</span> <span class="ident">env_logger</span>::<span class="ident">fmt</span>::<span class="ident">Color</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">builder</span> <span class="op">=</span> <span class="ident">env_logger</span>::<span class="ident">Builder</span>::<span class="ident">new</span>();
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<span class="ident">builder</span>.<span class="ident">format</span>(<span class="op">|</span><span class="ident">buf</span>, <span class="ident">record</span><span class="op">|</span> {
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">style</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">style</span>();
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<span class="ident">style</span>.<span class="ident">set_color</span>(<span class="ident">Color</span>::<span class="ident">Red</span>);
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<span class="macro">writeln</span><span class="macro">!</span>(<span class="ident">buf</span>, <span class="string">"{}"</span>, <span class="ident">style</span>.<span class="ident">value</span>(<span class="ident">record</span>.<span class="ident">args</span>()))
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});</pre>
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</div><h4 id='method.set_bold' class="method"><span id='set_bold.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.set_bold' class='fnname'>set_bold</a>(&mut self, yes: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>) -> &mut <a class="struct" href="../../env_logger/fmt/struct.Style.html" title="struct env_logger::fmt::Style">Style</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/env_logger/fmt.rs.html#316-319' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Set the text weight.</p>
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<p>If <code>yes</code> is true then text will be written in bold.
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If <code>yes</code> is false then text will be written in the default weight.</p>
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<h1 id="examples-2" class="section-header"><a href="#examples-2">Examples</a></h1>
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<p>Create a style with bold text:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Write</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">builder</span> <span class="op">=</span> <span class="ident">env_logger</span>::<span class="ident">Builder</span>::<span class="ident">new</span>();
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<span class="ident">builder</span>.<span class="ident">format</span>(<span class="op">|</span><span class="ident">buf</span>, <span class="ident">record</span><span class="op">|</span> {
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">style</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">style</span>();
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<span class="ident">style</span>.<span class="ident">set_bold</span>(<span class="bool-val">true</span>);
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<span class="macro">writeln</span><span class="macro">!</span>(<span class="ident">buf</span>, <span class="string">"{}"</span>, <span class="ident">style</span>.<span class="ident">value</span>(<span class="ident">record</span>.<span class="ident">args</span>()))
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});</pre>
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</div><h4 id='method.set_intense' class="method"><span id='set_intense.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.set_intense' class='fnname'>set_intense</a>(&mut self, yes: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>) -> &mut <a class="struct" href="../../env_logger/fmt/struct.Style.html" title="struct env_logger::fmt::Style">Style</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/env_logger/fmt.rs.html#343-346' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Set the text intensity.</p>
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<p>If <code>yes</code> is true then text will be written in a brighter color.
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If <code>yes</code> is false then text will be written in the default color.</p>
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<h1 id="examples-3" class="section-header"><a href="#examples-3">Examples</a></h1>
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<p>Create a style with intense text:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Write</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">builder</span> <span class="op">=</span> <span class="ident">env_logger</span>::<span class="ident">Builder</span>::<span class="ident">new</span>();
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<span class="ident">builder</span>.<span class="ident">format</span>(<span class="op">|</span><span class="ident">buf</span>, <span class="ident">record</span><span class="op">|</span> {
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">style</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">style</span>();
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<span class="ident">style</span>.<span class="ident">set_intense</span>(<span class="bool-val">true</span>);
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<span class="macro">writeln</span><span class="macro">!</span>(<span class="ident">buf</span>, <span class="string">"{}"</span>, <span class="ident">style</span>.<span class="ident">value</span>(<span class="ident">record</span>.<span class="ident">args</span>()))
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});</pre>
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</div><h4 id='method.set_bg' class="method"><span id='set_bg.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.set_bg' class='fnname'>set_bg</a>(&mut self, color: <a class="enum" href="../../env_logger/fmt/enum.Color.html" title="enum env_logger::fmt::Color">Color</a>) -> &mut <a class="struct" href="../../env_logger/fmt/struct.Style.html" title="struct env_logger::fmt::Style">Style</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/env_logger/fmt.rs.html#368-371' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Set the background color.</p>
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<h1 id="examples-4" class="section-header"><a href="#examples-4">Examples</a></h1>
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<p>Create a style with a yellow background:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Write</span>;
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<span class="kw">use</span> <span class="ident">env_logger</span>::<span class="ident">fmt</span>::<span class="ident">Color</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">builder</span> <span class="op">=</span> <span class="ident">env_logger</span>::<span class="ident">Builder</span>::<span class="ident">new</span>();
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<span class="ident">builder</span>.<span class="ident">format</span>(<span class="op">|</span><span class="ident">buf</span>, <span class="ident">record</span><span class="op">|</span> {
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">style</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">style</span>();
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<span class="ident">style</span>.<span class="ident">set_bg</span>(<span class="ident">Color</span>::<span class="ident">Yellow</span>);
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<span class="macro">writeln</span><span class="macro">!</span>(<span class="ident">buf</span>, <span class="string">"{}"</span>, <span class="ident">style</span>.<span class="ident">value</span>(<span class="ident">record</span>.<span class="ident">args</span>()))
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});</pre>
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</div><h4 id='method.value' class="method"><span id='value.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.value' class='fnname'>value</a><T>(&self, value: T) -> <a class="struct" href="../../env_logger/fmt/struct.StyledValue.html" title="struct env_logger::fmt::StyledValue">StyledValue</a><T></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/env_logger/fmt.rs.html#397-402' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Wrap a value in the style.</p>
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<p>The same <code>Style</code> can be used to print multiple different values.</p>
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<h1 id="examples-5" class="section-header"><a href="#examples-5">Examples</a></h1>
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<p>Create a bold, red colored style and use it to print the log level:</p>
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|
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<pre class="rust rust-example-rendered">
|
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Write</span>;
|
|||
|
|
<span class="kw">use</span> <span class="ident">env_logger</span>::<span class="ident">fmt</span>::<span class="ident">Color</span>;
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">builder</span> <span class="op">=</span> <span class="ident">env_logger</span>::<span class="ident">Builder</span>::<span class="ident">new</span>();
|
|||
|
|
|
|||
|
|
<span class="ident">builder</span>.<span class="ident">format</span>(<span class="op">|</span><span class="ident">buf</span>, <span class="ident">record</span><span class="op">|</span> {
|
|||
|
|
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">style</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">style</span>();
|
|||
|
|
|
|||
|
|
<span class="ident">style</span>.<span class="ident">set_color</span>(<span class="ident">Color</span>::<span class="ident">Red</span>).<span class="ident">set_bold</span>(<span class="bool-val">true</span>);
|
|||
|
|
|
|||
|
|
<span class="macro">writeln</span><span class="macro">!</span>(<span class="ident">buf</span>, <span class="string">"{}: {}"</span>,
|
|||
|
|
<span class="ident">style</span>.<span class="ident">value</span>(<span class="ident">record</span>.<span class="ident">level</span>()),
|
|||
|
|
<span class="ident">record</span>.<span class="ident">args</span>())
|
|||
|
|
});</pre>
|
|||
|
|
</div></div>
|
|||
|
|
<h2 id='implementations' class='small-section-header'>
|
|||
|
|
Trait Implementations<a href='#implementations' class='anchor'></a>
|
|||
|
|
</h2>
|
|||
|
|
<div id='implementations-list'>
|
|||
|
|
<h3 id='impl-Clone' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="../../env_logger/fmt/struct.Style.html" title="struct env_logger::fmt::Style">Style</a></code><a href='#impl-Clone' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/env_logger/fmt.rs.html#126' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.clone' class="method"><span id='clone.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&self) -> <a class="struct" href="../../env_logger/fmt/struct.Style.html" title="struct env_logger::fmt::Style">Style</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/env_logger/fmt.rs.html#126' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Returns a copy of the value. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone">Read more</a></p>
|
|||
|
|
</div><h4 id='method.clone_from' class="method"><span id='clone_from.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&mut self, source: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>Self)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/clone.rs.html#117-119' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from">Read more</a></p>
|
|||
|
|
</div></div><h3 id='impl-Debug' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../../env_logger/fmt/struct.Style.html" title="struct env_logger::fmt::Style">Style</a></code><a href='#impl-Debug' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/env_logger/fmt.rs.html#543-547' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/env_logger/fmt.rs.html#544-546' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
|
|||
|
|
</div></div></div>
|
|||
|
|
<h2 id='synthetic-implementations' class='small-section-header'>
|
|||
|
|
Auto Trait Implementations<a href='#synthetic-implementations' class='anchor'></a>
|
|||
|
|
</h2>
|
|||
|
|
<div id='synthetic-implementations-list'>
|
|||
|
|
<h3 id='impl-Send' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl !<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../../env_logger/fmt/struct.Style.html" title="struct env_logger::fmt::Style">Style</a></code><a href='#impl-Send' class='anchor'></a></span></td><td><span class='out-of-band'></span></td></tr></tbody></table></h3><div class='impl-items'></div><h3 id='impl-Sync' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl !<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="../../env_logger/fmt/struct.Style.html" title="struct env_logger::fmt::Style">Style</a></code><a href='#impl-Sync' class='anchor'></a></span></td><td><span class='out-of-band'></span></td></tr></tbody></table></h3><div class='impl-items'></div></div></section>
|
|||
|
|
<section id='search' class="content hidden"></section>
|
|||
|
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|
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|
|
<section class="footer"></section>
|
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|
|
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|
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<aside id="help" class="hidden">
|
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|
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<div>
|
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|
|
<h1 class="hidden">Help</h1>
|
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|
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|
|
<div class="shortcuts">
|
|||
|
|
<h2>Keyboard Shortcuts</h2>
|
|||
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|
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<dl>
|
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|
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<dt><kbd>?</kbd></dt>
|
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|
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<dd>Show this help dialog</dd>
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<dt><kbd>S</kbd></dt>
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<dd>Focus the search field</dd>
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<dt><kbd>↑</kbd></dt>
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<dd>Move up in search results</dd>
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<dd>Move down in search results</dd>
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<dd>Switch tab</dd>
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<dd>Go to active search result</dd>
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<dd>Collapse all sections</dd>
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</dl>
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</div>
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<div class="infos">
|
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|
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<h2>Search Tricks</h2>
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|
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<p>
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Prefix searches with a type followed by a colon (e.g.
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|
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<code>fn:</code>) to restrict the search to a given type.
|
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</p>
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|
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|
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<p>
|
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|
Accepted types are: <code>fn</code>, <code>mod</code>,
|
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|
|
<code>struct</code>, <code>enum</code>,
|
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|
|
<code>trait</code>, <code>type</code>, <code>macro</code>,
|
|||
|
|
and <code>const</code>.
|
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</p>
|
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|
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|
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<p>
|
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Search functions by type signature (e.g.
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<code>vec -> usize</code> or <code>* -> vec</code>)
|
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</p>
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</div>
|
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</div>
|
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</aside>
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<script>
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window.rootPath = "../../";
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window.currentCrate = "env_logger";
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