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 </pre><pre class="rust"><code><span class="comment">// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at
 // http://rust-lang.org/COPYRIGHT.
 //
 // Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or
 // http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license
 // &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.

 </span><span class="doccomment">//! A simple logger configured via environment variables which writes
 //! to stdout or stderr, for use with the logging facade exposed by the
 //! [`log` crate][log-crate-url].
 //!
 //! ## Example
 //!
 //! ```
 //! #[macro_use] extern crate log;
 //!
 //! use log::Level;
 //!
 //! fn main() {
 //!     env_logger::init();
 //!
 //!     debug!(&quot;this is a debug {}&quot;, &quot;message&quot;);
 //!     error!(&quot;this is printed by default&quot;);
 //!
 //!     if log_enabled!(Level::Info) {
 //!         let x = 3 * 4; // expensive computation
 //!         info!(&quot;the answer was: {}&quot;, x);
 //!     }
 //! }
 //! ```
 //!
 //! Assumes the binary is `main`:
 //!
 //! ```{.bash}
 //! $ RUST_LOG=error ./main
 //! [2017-11-09T02:12:24Z ERROR main] this is printed by default
 //! ```
 //!
 //! ```{.bash}
 //! $ RUST_LOG=info ./main
 //! [2017-11-09T02:12:24Z ERROR main] this is printed by default
 //! [2017-11-09T02:12:24Z INFO main] the answer was: 12
 //! ```
 //!
 //! ```{.bash}
 //! $ RUST_LOG=debug ./main
 //! [2017-11-09T02:12:24Z DEBUG main] this is a debug message
 //! [2017-11-09T02:12:24Z ERROR main] this is printed by default
 //! [2017-11-09T02:12:24Z INFO main] the answer was: 12
 //! ```
 //!
 //! You can also set the log level on a per module basis:
 //!
 //! ```{.bash}
 //! $ RUST_LOG=main=info ./main
 //! [2017-11-09T02:12:24Z ERROR main] this is printed by default
 //! [2017-11-09T02:12:24Z INFO main] the answer was: 12
 //! ```
 //!
 //! And enable all logging:
 //!
 //! ```{.bash}
 //! $ RUST_LOG=main ./main
 //! [2017-11-09T02:12:24Z DEBUG main] this is a debug message
 //! [2017-11-09T02:12:24Z ERROR main] this is printed by default
 //! [2017-11-09T02:12:24Z INFO main] the answer was: 12
 //! ```
 //!
 //! If the binary name contains hyphens, you will need to replace
 //! them with underscores:
 //!
 //! ```{.bash}
 //! $ RUST_LOG=my_app ./my-app
 //! [2017-11-09T02:12:24Z DEBUG my_app] this is a debug message
 //! [2017-11-09T02:12:24Z ERROR my_app] this is printed by default
 //! [2017-11-09T02:12:24Z INFO my_app] the answer was: 12
 //! ```
 //!
 //! This is because Rust modules and crates cannot contain hyphens
 //! in their name, although `cargo` continues to accept them.
 //!
 //! See the documentation for the [`log` crate][log-crate-url] for more
 //! information about its API.
 //!
 //! ## Enabling logging
 //!
 //! Log levels are controlled on a per-module basis, and by default all logging
 //! is disabled except for `error!`. Logging is controlled via the `RUST_LOG`
 //! environment variable. The value of this environment variable is a
 //! comma-separated list of logging directives. A logging directive is of the
 //! form:
 //!
 //! ```text
 //! path::to::module=level
 //! ```
 //!
 //! The path to the module is rooted in the name of the crate it was compiled
 //! for, so if your program is contained in a file `hello.rs`, for example, to
 //! turn on logging for this file you would use a value of `RUST_LOG=hello`.
 //! Furthermore, this path is a prefix-search, so all modules nested in the
 //! specified module will also have logging enabled.
 //!
 //! The actual `level` is optional to specify. If omitted, all logging will
 //! be enabled. If specified, it must be one of the strings `debug`, `error`,
 //! `info`, `warn`, or `trace`.
 //!
 //! As the log level for a module is optional, the module to enable logging for
 //! is also optional. If only a `level` is provided, then the global log
 //! level for all modules is set to this value.
 //!
 //! Some examples of valid values of `RUST_LOG` are:
 //!
 //! * `hello` turns on all logging for the &#39;hello&#39; module
 //! * `info` turns on all info logging
 //! * `hello=debug` turns on debug logging for &#39;hello&#39;
 //! * `hello,std::option` turns on hello, and std&#39;s option logging
 //! * `error,hello=warn` turn on global error logging and also warn for hello
 //!
 //! ## Filtering results
 //!
 //! A `RUST_LOG` directive may include a regex filter. The syntax is to append `/`
 //! followed by a regex. Each message is checked against the regex, and is only
 //! logged if it matches. Note that the matching is done after formatting the
 //! log string but before adding any logging meta-data. There is a single filter
 //! for all modules.
 //!
 //! Some examples:
 //!
 //! * `hello/foo` turns on all logging for the &#39;hello&#39; module where the log
 //!   message includes &#39;foo&#39;.
 //! * `info/f.o` turns on all info logging where the log message includes &#39;foo&#39;,
 //!   &#39;f1o&#39;, &#39;fao&#39;, etc.
 //! * `hello=debug/foo*foo` turns on debug logging for &#39;hello&#39; where the log
 //!   message includes &#39;foofoo&#39; or &#39;fofoo&#39; or &#39;fooooooofoo&#39;, etc.
 //! * `error,hello=warn/[0-9]scopes` turn on global error logging and also
 //!   warn for hello. In both cases the log message must include a single digit
 //!   number followed by &#39;scopes&#39;.
 //!
 //! ## Capturing logs in tests
 //!
 //! Records logged during `cargo test` will not be captured by the test harness by default.
 //! The [`Builder::is_test`] method can be used in unit tests to ensure logs will be captured:
 //!
 //! ```
 //! # #[macro_use] extern crate log;
 //! # fn main() {}
 //! #[cfg(test)]
 //! mod tests {
 //!     fn init() {
 //!         let _ = env_logger::builder().is_test(true).try_init();
 //!     }
 //!
 //!     #[test]
 //!     fn it_works() {
 //!         init();
 //!
 //!         info!(&quot;This record will be captured by `cargo test`&quot;);
 //!
 //!         assert_eq!(2, 1 + 1);
 //!     }
 //! }
 //! ```
 //!
 //! Enabling test capturing comes at the expense of color and other style support
 //! and may have performance implications.
 //!
 //! ## Disabling colors
 //!
 //! Colors and other styles can be configured with the `RUST_LOG_STYLE`
 //! environment variable. It accepts the following values:
 //!
 //! * `auto` (default) will attempt to print style characters, but don&#39;t force the issue.
 //! If the console isn&#39;t available on Windows, or if TERM=dumb, for example, then don&#39;t print colors.
 //! * `always` will always print style characters even if they aren&#39;t supported by the terminal.
 //! This includes emitting ANSI colors on Windows if the console API is unavailable.
 //! * `never` will never print style characters.
 //!
 //! ## Tweaking the default format
 //!
 //! Parts of the default format can be excluded from the log output using the [`Builder`].
 //! The following example excludes the timestamp from the log output:
 //!
 //! ```
 //! env_logger::builder()
 //!     .format_timestamp(None)
 //!     .init();
 //! ```
 //!
 //! ### Stability of the default format
 //!
 //! The default format won&#39;t optimise for long-term stability, and explicitly makes no
 //! guarantees about the stability of its output across major, minor or patch version
 //! bumps during `0.x`.
 //!
 //! If you want to capture or interpret the output of `env_logger` programmatically
 //! then you should use a custom format.
 //!
 //! ### Using a custom format
 //!
 //! Custom formats can be provided as closures to the [`Builder`].
 //! These closures take a [`Formatter`] and `log::Record` as arguments:
 //!
 //! ```
 //! use std::io::Write;
 //!
 //! env_logger::builder()
 //!     .format(|buf, record| {
 //!         writeln!(buf, &quot;{}: {}&quot;, record.level(), record.args())
 //!     })
 //!     .init();
 //! ```
 //!
 //! See the [`fmt`] module for more details about custom formats.
 //!
 //! ## Specifying defaults for environment variables
 //!
 //! `env_logger` can read configuration from environment variables.
 //! If these variables aren&#39;t present, the default value to use can be tweaked with the [`Env`] type.
 //! The following example defaults to log `warn` and above if the `RUST_LOG` environment variable
 //! isn&#39;t set:
 //!
 //! ```
 //! use env_logger::Env;
 //!
 //! env_logger::from_env(Env::default().default_filter_or(&quot;warn&quot;)).init();
 //! ```
 //!
 //! [log-crate-url]: https://docs.rs/log/
 //! [`Builder`]: struct.Builder.html
 //! [`Builder::is_test`]: struct.Builder.html#method.is_test
 //! [`Env`]: struct.Env.html
 //! [`fmt`]: fmt/index.html

 </span><span class="attribute">#![doc(
     html_logo_url = <span class="string">&quot;https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png&quot;</span>,
     html_favicon_url = <span class="string">&quot;https://www.rust-lang.org/static/images/favicon.ico&quot;</span>,
     html_root_url = <span class="string">&quot;https://docs.rs/env_logger/0.7.1&quot;
 </span>)]
 #![cfg_attr(test, deny(warnings))]
 </span><span class="comment">// When compiled for the rustc compiler itself we want to make sure that this is
 // an unstable crate
 </span><span class="attribute">#![cfg_attr(rustbuild, feature(staged_api, rustc_private))]
 #![cfg_attr(rustbuild, unstable(feature = <span class="string">&quot;rustc_private&quot;</span>, issue = <span class="string">&quot;27812&quot;</span>))]
 #![deny(missing_debug_implementations, missing_docs, warnings)]

 </span><span class="kw">use </span>std::{borrow::Cow, cell::RefCell, env, io};

 <span class="kw">use </span>log::{LevelFilter, Log, Metadata, Record, SetLoggerError};

 <span class="kw">pub mod </span>filter;
 <span class="kw">pub mod </span>fmt;

 <span class="kw">pub use </span><span class="self">self</span>::fmt::glob::<span class="kw-2">*</span>;

 <span class="kw">use </span><span class="self">self</span>::filter::Filter;
 <span class="kw">use </span><span class="self">self</span>::fmt::writer::{<span class="self">self</span>, Writer};
 <span class="kw">use </span><span class="self">self</span>::fmt::Formatter;

 <span class="doccomment">/// The default name for the environment variable to read filters from.
 </span><span class="kw">pub const </span>DEFAULT_FILTER_ENV: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str = <span class="string">&quot;RUST_LOG&quot;</span>;

 <span class="doccomment">/// The default name for the environment variable to read style preferences from.
 </span><span class="kw">pub const </span>DEFAULT_WRITE_STYLE_ENV: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str = <span class="string">&quot;RUST_LOG_STYLE&quot;</span>;

 <span class="doccomment">/// Set of environment variables to configure from.
 ///
 /// # Default environment variables
 ///
 /// By default, the `Env` will read the following environment variables:
 ///
 /// - `RUST_LOG`: the level filter
 /// - `RUST_LOG_STYLE`: whether or not to print styles with records.
 ///
 /// These sources can be configured using the builder methods on `Env`.
 </span><span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub struct </span>Env&lt;<span class="lifetime">&#39;a</span>&gt; {
     filter: Var&lt;<span class="lifetime">&#39;a</span>&gt;,
     write_style: Var&lt;<span class="lifetime">&#39;a</span>&gt;,
 }

 <span class="attribute">#[derive(Debug)]
 </span><span class="kw">struct </span>Var&lt;<span class="lifetime">&#39;a</span>&gt; {
     name: Cow&lt;<span class="lifetime">&#39;a</span>, str&gt;,
     default: <span class="prelude-ty">Option</span>&lt;Cow&lt;<span class="lifetime">&#39;a</span>, str&gt;&gt;,
 }

 <span class="doccomment">/// The env logger.
 ///
 /// This struct implements the `Log` trait from the [`log` crate][log-crate-url],
 /// which allows it to act as a logger.
 ///
 /// The [`init()`], [`try_init()`], [`Builder::init()`] and [`Builder::try_init()`]
 /// methods will each construct a `Logger` and immediately initialize it as the
 /// default global logger.
 ///
 /// If you&#39;d instead need access to the constructed `Logger`, you can use
 /// the associated [`Builder`] and install it with the
 /// [`log` crate][log-crate-url] directly.
 ///
 /// [log-crate-url]: https://docs.rs/log/
 /// [`init()`]: fn.init.html
 /// [`try_init()`]: fn.try_init.html
 /// [`Builder::init()`]: struct.Builder.html#method.init
 /// [`Builder::try_init()`]: struct.Builder.html#method.try_init
 /// [`Builder`]: struct.Builder.html
 </span><span class="kw">pub struct </span>Logger {
     writer: Writer,
     filter: Filter,
     <span class="attribute">#[allow(unknown_lints, bare_trait_objects)]
     </span>format: Box&lt;Fn(<span class="kw-2">&amp;mut </span>Formatter, <span class="kw-2">&amp;</span>Record) -&gt; io::Result&lt;()&gt; + Sync + Send&gt;,
 }

 <span class="doccomment">/// `Builder` acts as builder for initializing a `Logger`.
 ///
 /// It can be used to customize the log format, change the environment variable used
 /// to provide the logging directives and also set the default log level filter.
 ///
 /// # Examples
 ///
 /// ```
 /// #[macro_use] extern crate log;
 ///
 /// use std::env;
 /// use std::io::Write;
 /// use log::LevelFilter;
 /// use env_logger::Builder;
 ///
 /// fn main() {
 ///     let mut builder = Builder::from_default_env();
 ///
 ///     builder.format(|buf, record| writeln!(buf, &quot;{} - {}&quot;, record.level(), record.args()))
 ///            .filter(None, LevelFilter::Info)
 ///            .init();
 ///
 ///     error!(&quot;error message&quot;);
 ///     info!(&quot;info message&quot;);
 /// }
 /// ```
 </span><span class="attribute">#[derive(Default)]
 </span><span class="kw">pub struct </span>Builder {
     filter: filter::Builder,
     writer: writer::Builder,
     format: fmt::Builder,
     built: bool,
 }

 <span class="kw">impl </span>Builder {
     <span class="doccomment">/// Initializes the log builder with defaults.
     ///
     /// **NOTE:** This method won&#39;t read from any environment variables.
     /// Use the [`filter`] and [`write_style`] methods to configure the builder
     /// or use [`from_env`] or [`from_default_env`] instead.
     ///
     /// # Examples
     ///
     /// Create a new builder and configure filters and style:
     ///
     /// ```
     /// # fn main() {
     /// use log::LevelFilter;
     /// use env_logger::{Builder, WriteStyle};
     ///
     /// let mut builder = Builder::new();
     ///
     /// builder.filter(None, LevelFilter::Info)
     ///        .write_style(WriteStyle::Always)
     ///        .init();
     /// # }
     /// ```
     ///
     /// [`filter`]: #method.filter
     /// [`write_style`]: #method.write_style
     /// [`from_env`]: #method.from_env
     /// [`from_default_env`]: #method.from_default_env
     </span><span class="kw">pub fn </span>new() -&gt; Builder {
         Default::default()
     }

     <span class="doccomment">/// Initializes the log builder from the environment.
     ///
     /// The variables used to read configuration from can be tweaked before
     /// passing in.
     ///
     /// # Examples
     ///
     /// Initialise a logger reading the log filter from an environment variable
     /// called `MY_LOG`:
     ///
     /// ```
     /// use env_logger::Builder;
     ///
     /// let mut builder = Builder::from_env(&quot;MY_LOG&quot;);
     /// builder.init();
     /// ```
     ///
     /// Initialise a logger using the `MY_LOG` variable for filtering and
     /// `MY_LOG_STYLE` for whether or not to write styles:
     ///
     /// ```
     /// use env_logger::{Builder, Env};
     ///
     /// let env = Env::new().filter(&quot;MY_LOG&quot;).write_style(&quot;MY_LOG_STYLE&quot;);
     ///
     /// let mut builder = Builder::from_env(env);
     /// builder.init();
     /// ```
     </span><span class="kw">pub fn </span>from_env&lt;<span class="lifetime">&#39;a</span>, E&gt;(env: E) -&gt; <span class="self">Self
     </span><span class="kw">where
         </span>E: Into&lt;Env&lt;<span class="lifetime">&#39;a</span>&gt;&gt;,
     {
         <span class="kw">let </span><span class="kw-2">mut </span>builder = Builder::new();
         <span class="kw">let </span>env = env.into();

         <span class="kw">if let </span><span class="prelude-val">Some</span>(s) = env.get_filter() {
             builder.parse_filters(<span class="kw-2">&amp;</span>s);
         }

         <span class="kw">if let </span><span class="prelude-val">Some</span>(s) = env.get_write_style() {
             builder.parse_write_style(<span class="kw-2">&amp;</span>s);
         }

         builder
     }

     <span class="doccomment">/// Initializes the log builder from the environment using default variable names.
     ///
     /// This method is a convenient way to call `from_env(Env::default())` without
     /// having to use the `Env` type explicitly. The builder will use the
     /// [default environment variables].
     ///
     /// # Examples
     ///
     /// Initialise a logger using the default environment variables:
     ///
     /// ```
     /// use env_logger::Builder;
     ///
     /// let mut builder = Builder::from_default_env();
     /// builder.init();
     /// ```
     ///
     /// [default environment variables]: struct.Env.html#default-environment-variables
     </span><span class="kw">pub fn </span>from_default_env() -&gt; <span class="self">Self </span>{
         <span class="self">Self</span>::from_env(Env::default())
     }

     <span class="doccomment">/// Sets the format function for formatting the log output.
     ///
     /// This function is called on each record logged and should format the
     /// log record and output it to the given [`Formatter`].
     ///
     /// The format function is expected to output the string directly to the
     /// `Formatter` so that implementations can use the [`std::fmt`] macros
     /// to format and output without intermediate heap allocations. The default
     /// `env_logger` formatter takes advantage of this.
     ///
     /// # Examples
     ///
     /// Use a custom format to write only the log message:
     ///
     /// ```
     /// use std::io::Write;
     /// use env_logger::Builder;
     ///
     /// let mut builder = Builder::new();
     ///
     /// builder.format(|buf, record| writeln!(buf, &quot;{}&quot;, record.args()));
     /// ```
     ///
     /// [`Formatter`]: fmt/struct.Formatter.html
     /// [`String`]: https://doc.rust-lang.org/stable/std/string/struct.String.html
     /// [`std::fmt`]: https://doc.rust-lang.org/std/fmt/index.html
     </span><span class="kw">pub fn </span>format&lt;F: <span class="lifetime">&#39;static</span>&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, format: F) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self
     </span><span class="kw">where
         </span>F: Fn(<span class="kw-2">&amp;mut </span>Formatter, <span class="kw-2">&amp;</span>Record) -&gt; io::Result&lt;()&gt; + Sync + Send,
     {
         <span class="self">self</span>.format.custom_format = <span class="prelude-val">Some</span>(Box::new(format));
         <span class="self">self
     </span>}

     <span class="doccomment">/// Use the default format.
     ///
     /// This method will clear any custom format set on the builder.
     </span><span class="kw">pub fn </span>default_format(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.format = Default::default();
         <span class="self">self
     </span>}

     <span class="doccomment">/// Whether or not to write the level in the default format.
     </span><span class="kw">pub fn </span>format_level(<span class="kw-2">&amp;mut </span><span class="self">self</span>, write: bool) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.format.format_level = write;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Whether or not to write the module path in the default format.
     </span><span class="kw">pub fn </span>format_module_path(<span class="kw-2">&amp;mut </span><span class="self">self</span>, write: bool) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.format.format_module_path = write;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Configures the amount of spaces to use to indent multiline log records.
     /// A value of `None` disables any kind of indentation.
     </span><span class="kw">pub fn </span>format_indent(<span class="kw-2">&amp;mut </span><span class="self">self</span>, indent: <span class="prelude-ty">Option</span>&lt;usize&gt;) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.format.format_indent = indent;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Configures if timestamp should be included and in what precision.
     </span><span class="kw">pub fn </span>format_timestamp(<span class="kw-2">&amp;mut </span><span class="self">self</span>, timestamp: <span class="prelude-ty">Option</span>&lt;fmt::TimestampPrecision&gt;) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.format.format_timestamp = timestamp;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Configures the timestamp to use second precision.
     </span><span class="kw">pub fn </span>format_timestamp_secs(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.format_timestamp(<span class="prelude-val">Some</span>(fmt::TimestampPrecision::Seconds))
     }

     <span class="doccomment">/// Configures the timestamp to use millisecond precision.
     </span><span class="kw">pub fn </span>format_timestamp_millis(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.format_timestamp(<span class="prelude-val">Some</span>(fmt::TimestampPrecision::Millis))
     }

     <span class="doccomment">/// Configures the timestamp to use microsecond precision.
     </span><span class="kw">pub fn </span>format_timestamp_micros(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.format_timestamp(<span class="prelude-val">Some</span>(fmt::TimestampPrecision::Micros))
     }

     <span class="doccomment">/// Configures the timestamp to use nanosecond precision.
     </span><span class="kw">pub fn </span>format_timestamp_nanos(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.format_timestamp(<span class="prelude-val">Some</span>(fmt::TimestampPrecision::Nanos))
     }

     <span class="doccomment">/// Adds a directive to the filter for a specific module.
     ///
     /// # Examples
     ///
     /// Only include messages for warning and above for logs in `path::to::module`:
     ///
     /// ```
     /// # fn main() {
     /// use log::LevelFilter;
     /// use env_logger::Builder;
     ///
     /// let mut builder = Builder::new();
     ///
     /// builder.filter_module(&quot;path::to::module&quot;, LevelFilter::Info);
     /// # }
     /// ```
     </span><span class="kw">pub fn </span>filter_module(<span class="kw-2">&amp;mut </span><span class="self">self</span>, module: <span class="kw-2">&amp;</span>str, level: LevelFilter) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.filter.filter_module(module, level);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Adds a directive to the filter for all modules.
     ///
     /// # Examples
     ///
     /// Only include messages for warning and above for logs in `path::to::module`:
     ///
     /// ```
     /// # fn main() {
     /// use log::LevelFilter;
     /// use env_logger::Builder;
     ///
     /// let mut builder = Builder::new();
     ///
     /// builder.filter_level(LevelFilter::Info);
     /// # }
     /// ```
     </span><span class="kw">pub fn </span>filter_level(<span class="kw-2">&amp;mut </span><span class="self">self</span>, level: LevelFilter) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.filter.filter_level(level);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Adds filters to the logger.
     ///
     /// The given module (if any) will log at most the specified level provided.
     /// If no module is provided then the filter will apply to all log messages.
     ///
     /// # Examples
     ///
     /// Only include messages for warning and above for logs in `path::to::module`:
     ///
     /// ```
     /// # fn main() {
     /// use log::LevelFilter;
     /// use env_logger::Builder;
     ///
     /// let mut builder = Builder::new();
     ///
     /// builder.filter(Some(&quot;path::to::module&quot;), LevelFilter::Info);
     /// # }
     /// ```
     </span><span class="kw">pub fn </span>filter(<span class="kw-2">&amp;mut </span><span class="self">self</span>, module: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>str&gt;, level: LevelFilter) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.filter.filter(module, level);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Parses the directives string in the same form as the `RUST_LOG`
     /// environment variable.
     ///
     /// See the module documentation for more details.
     </span><span class="kw">pub fn </span>parse_filters(<span class="kw-2">&amp;mut </span><span class="self">self</span>, filters: <span class="kw-2">&amp;</span>str) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.filter.parse(filters);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the target for the log output.
     ///
     /// Env logger can log to either stdout or stderr. The default is stderr.
     ///
     /// # Examples
     ///
     /// Write log message to `stdout`:
     ///
     /// ```
     /// use env_logger::{Builder, Target};
     ///
     /// let mut builder = Builder::new();
     ///
     /// builder.target(Target::Stdout);
     /// ```
     </span><span class="kw">pub fn </span>target(<span class="kw-2">&amp;mut </span><span class="self">self</span>, target: fmt::Target) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.writer.target(target);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets whether or not styles will be written.
     ///
     /// This can be useful in environments that don&#39;t support control characters
     /// for setting colors.
     ///
     /// # Examples
     ///
     /// Never attempt to write styles:
     ///
     /// ```
     /// use env_logger::{Builder, WriteStyle};
     ///
     /// let mut builder = Builder::new();
     ///
     /// builder.write_style(WriteStyle::Never);
     /// ```
     </span><span class="kw">pub fn </span>write_style(<span class="kw-2">&amp;mut </span><span class="self">self</span>, write_style: fmt::WriteStyle) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.writer.write_style(write_style);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Parses whether or not to write styles in the same form as the `RUST_LOG_STYLE`
     /// environment variable.
     ///
     /// See the module documentation for more details.
     </span><span class="kw">pub fn </span>parse_write_style(<span class="kw-2">&amp;mut </span><span class="self">self</span>, write_style: <span class="kw-2">&amp;</span>str) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.writer.parse_write_style(write_style);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets whether or not the logger will be used in unit tests.
     ///
     /// If `is_test` is `true` then the logger will allow the testing framework to
     /// capture log records rather than printing them to the terminal directly.
     </span><span class="kw">pub fn </span>is_test(<span class="kw-2">&amp;mut </span><span class="self">self</span>, is_test: bool) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.writer.is_test(is_test);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Initializes the global logger with the built env logger.
     ///
     /// This should be called early in the execution of a Rust program. Any log
     /// events that occur before initialization will be ignored.
     ///
     /// # Errors
     ///
     /// This function will fail if it is called more than once, or if another
     /// library has already initialized a global logger.
     </span><span class="kw">pub fn </span>try_init(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;(), SetLoggerError&gt; {
         <span class="kw">let </span>logger = <span class="self">self</span>.build();

         <span class="kw">let </span>max_level = logger.filter();
         <span class="kw">let </span>r = log::set_boxed_logger(Box::new(logger));

         <span class="kw">if </span>r.is_ok() {
             log::set_max_level(max_level);
         }

         r
     }

     <span class="doccomment">/// Initializes the global logger with the built env logger.
     ///
     /// This should be called early in the execution of a Rust program. Any log
     /// events that occur before initialization will be ignored.
     ///
     /// # Panics
     ///
     /// This function will panic if it is called more than once, or if another
     /// library has already initialized a global logger.
     </span><span class="kw">pub fn </span>init(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="self">self</span>.try_init()
             .expect(<span class="string">&quot;Builder::init should not be called after logger initialized&quot;</span>);
     }

     <span class="doccomment">/// Build an env logger.
     ///
     /// The returned logger implements the `Log` trait and can be installed manually
     /// or nested within another logger.
     </span><span class="kw">pub fn </span>build(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; Logger {
         <span class="macro">assert!</span>(!<span class="self">self</span>.built, <span class="string">&quot;attempt to re-use consumed builder&quot;</span>);
         <span class="self">self</span>.built = <span class="bool-val">true</span>;

         Logger {
             writer: <span class="self">self</span>.writer.build(),
             filter: <span class="self">self</span>.filter.build(),
             format: <span class="self">self</span>.format.build(),
         }
     }
 }

 <span class="kw">impl </span>Logger {
     <span class="doccomment">/// Creates the logger from the environment.
     ///
     /// The variables used to read configuration from can be tweaked before
     /// passing in.
     ///
     /// # Examples
     ///
     /// Create a logger reading the log filter from an environment variable
     /// called `MY_LOG`:
     ///
     /// ```
     /// use env_logger::Logger;
     ///
     /// let logger = Logger::from_env(&quot;MY_LOG&quot;);
     /// ```
     ///
     /// Create a logger using the `MY_LOG` variable for filtering and
     /// `MY_LOG_STYLE` for whether or not to write styles:
     ///
     /// ```
     /// use env_logger::{Logger, Env};
     ///
     /// let env = Env::new().filter_or(&quot;MY_LOG&quot;, &quot;info&quot;).write_style_or(&quot;MY_LOG_STYLE&quot;, &quot;always&quot;);
     ///
     /// let logger = Logger::from_env(env);
     /// ```
     </span><span class="kw">pub fn </span>from_env&lt;<span class="lifetime">&#39;a</span>, E&gt;(env: E) -&gt; <span class="self">Self
     </span><span class="kw">where
         </span>E: Into&lt;Env&lt;<span class="lifetime">&#39;a</span>&gt;&gt;,
     {
         Builder::from_env(env).build()
     }

     <span class="doccomment">/// Creates the logger from the environment using default variable names.
     ///
     /// This method is a convenient way to call `from_env(Env::default())` without
     /// having to use the `Env` type explicitly. The logger will use the
     /// [default environment variables].
     ///
     /// # Examples
     ///
     /// Creates a logger using the default environment variables:
     ///
     /// ```
     /// use env_logger::Logger;
     ///
     /// let logger = Logger::from_default_env();
     /// ```
     ///
     /// [default environment variables]: struct.Env.html#default-environment-variables
     </span><span class="kw">pub fn </span>from_default_env() -&gt; <span class="self">Self </span>{
         Builder::from_default_env().build()
     }

     <span class="doccomment">/// Returns the maximum `LevelFilter` that this env logger instance is
     /// configured to output.
     </span><span class="kw">pub fn </span>filter(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; LevelFilter {
         <span class="self">self</span>.filter.filter()
     }

     <span class="doccomment">/// Checks if this record matches the configured filter.
     </span><span class="kw">pub fn </span>matches(<span class="kw-2">&amp;</span><span class="self">self</span>, record: <span class="kw-2">&amp;</span>Record) -&gt; bool {
         <span class="self">self</span>.filter.matches(record)
     }
 }

 <span class="kw">impl </span>Log <span class="kw">for </span>Logger {
     <span class="kw">fn </span>enabled(<span class="kw-2">&amp;</span><span class="self">self</span>, metadata: <span class="kw-2">&amp;</span>Metadata) -&gt; bool {
         <span class="self">self</span>.filter.enabled(metadata)
     }

     <span class="kw">fn </span>log(<span class="kw-2">&amp;</span><span class="self">self</span>, record: <span class="kw-2">&amp;</span>Record) {
         <span class="kw">if </span><span class="self">self</span>.matches(record) {
             <span class="comment">// Log records are written to a thread-local buffer before being printed
             // to the terminal. We clear these buffers afterwards, but they aren&#39;t shrinked
             // so will always at least have capacity for the largest log record formatted
             // on that thread.
             //
             // If multiple `Logger`s are used by the same threads then the thread-local
             // formatter might have different color support. If this is the case the
             // formatter and its buffer are discarded and recreated.

             </span><span class="macro">thread_local! </span>{
                 <span class="kw">static </span>FORMATTER: RefCell&lt;<span class="prelude-ty">Option</span>&lt;Formatter&gt;&gt; = RefCell::new(<span class="prelude-val">None</span>);
             }

             <span class="kw">let </span>print = |formatter: <span class="kw-2">&amp;mut </span>Formatter, record: <span class="kw-2">&amp;</span>Record| {
                 <span class="kw">let _ </span>=
                     (<span class="self">self</span>.format)(formatter, record).and_then(|<span class="kw">_</span>| formatter.print(<span class="kw-2">&amp;</span><span class="self">self</span>.writer));

                 <span class="comment">// Always clear the buffer afterwards
                 </span>formatter.clear();
             };

             <span class="kw">let </span>printed = FORMATTER
                 .try_with(|tl_buf| {
                     <span class="kw">match </span>tl_buf.try_borrow_mut() {
                         <span class="comment">// There are no active borrows of the buffer
                         </span><span class="prelude-val">Ok</span>(<span class="kw-2">mut </span>tl_buf) =&gt; <span class="kw">match </span><span class="kw-2">*</span>tl_buf {
                             <span class="comment">// We have a previously set formatter
                             </span><span class="prelude-val">Some</span>(<span class="kw-2">ref mut </span>formatter) =&gt; {
                                 <span class="comment">// Check the buffer style. If it&#39;s different from the logger&#39;s
                                 // style then drop the buffer and recreate it.
                                 </span><span class="kw">if </span>formatter.write_style() != <span class="self">self</span>.writer.write_style() {
                                     <span class="kw-2">*</span>formatter = Formatter::new(<span class="kw-2">&amp;</span><span class="self">self</span>.writer);
                                 }

                                 print(formatter, record);
                             }
                             <span class="comment">// We don&#39;t have a previously set formatter
                             </span><span class="prelude-val">None </span>=&gt; {
                                 <span class="kw">let </span><span class="kw-2">mut </span>formatter = Formatter::new(<span class="kw-2">&amp;</span><span class="self">self</span>.writer);
                                 print(<span class="kw-2">&amp;mut </span>formatter, record);

                                 <span class="kw-2">*</span>tl_buf = <span class="prelude-val">Some</span>(formatter);
                             }
                         },
                         <span class="comment">// There&#39;s already an active borrow of the buffer (due to re-entrancy)
                         </span><span class="prelude-val">Err</span>(<span class="kw">_</span>) =&gt; {
                             print(<span class="kw-2">&amp;mut </span>Formatter::new(<span class="kw-2">&amp;</span><span class="self">self</span>.writer), record);
                         }
                     }
                 })
                 .is_ok();

             <span class="kw">if </span>!printed {
                 <span class="comment">// The thread-local storage was not available (because its
                 // destructor has already run). Create a new single-use
                 // Formatter on the stack for this call.
                 </span>print(<span class="kw-2">&amp;mut </span>Formatter::new(<span class="kw-2">&amp;</span><span class="self">self</span>.writer), record);
             }
         }
     }

     <span class="kw">fn </span>flush(<span class="kw-2">&amp;</span><span class="self">self</span>) {}
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Env&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="doccomment">/// Get a default set of environment variables.
     </span><span class="kw">pub fn </span>new() -&gt; <span class="self">Self </span>{
         <span class="self">Self</span>::default()
     }

     <span class="doccomment">/// Specify an environment variable to read the filter from.
     </span><span class="kw">pub fn </span>filter&lt;E&gt;(<span class="kw-2">mut </span><span class="self">self</span>, filter_env: E) -&gt; <span class="self">Self
     </span><span class="kw">where
         </span>E: Into&lt;Cow&lt;<span class="lifetime">&#39;a</span>, str&gt;&gt;,
     {
         <span class="self">self</span>.filter = Var::new(filter_env);

         <span class="self">self
     </span>}

     <span class="doccomment">/// Specify an environment variable to read the filter from.
     ///
     /// If the variable is not set, the default value will be used.
     </span><span class="kw">pub fn </span>filter_or&lt;E, V&gt;(<span class="kw-2">mut </span><span class="self">self</span>, filter_env: E, default: V) -&gt; <span class="self">Self
     </span><span class="kw">where
         </span>E: Into&lt;Cow&lt;<span class="lifetime">&#39;a</span>, str&gt;&gt;,
         V: Into&lt;Cow&lt;<span class="lifetime">&#39;a</span>, str&gt;&gt;,
     {
         <span class="self">self</span>.filter = Var::new_with_default(filter_env, default);

         <span class="self">self
     </span>}

     <span class="doccomment">/// Use the default environment variable to read the filter from.
     ///
     /// If the variable is not set, the default value will be used.
     </span><span class="kw">pub fn </span>default_filter_or&lt;V&gt;(<span class="kw-2">mut </span><span class="self">self</span>, default: V) -&gt; <span class="self">Self
     </span><span class="kw">where
         </span>V: Into&lt;Cow&lt;<span class="lifetime">&#39;a</span>, str&gt;&gt;,
     {
         <span class="self">self</span>.filter = Var::new_with_default(DEFAULT_FILTER_ENV, default);

         <span class="self">self
     </span>}

     <span class="kw">fn </span>get_filter(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;String&gt; {
         <span class="self">self</span>.filter.get()
     }

     <span class="doccomment">/// Specify an environment variable to read the style from.
     </span><span class="kw">pub fn </span>write_style&lt;E&gt;(<span class="kw-2">mut </span><span class="self">self</span>, write_style_env: E) -&gt; <span class="self">Self
     </span><span class="kw">where
         </span>E: Into&lt;Cow&lt;<span class="lifetime">&#39;a</span>, str&gt;&gt;,
     {
         <span class="self">self</span>.write_style = Var::new(write_style_env);

         <span class="self">self
     </span>}

     <span class="doccomment">/// Specify an environment variable to read the style from.
     ///
     /// If the variable is not set, the default value will be used.
     </span><span class="kw">pub fn </span>write_style_or&lt;E, V&gt;(<span class="kw-2">mut </span><span class="self">self</span>, write_style_env: E, default: V) -&gt; <span class="self">Self
     </span><span class="kw">where
         </span>E: Into&lt;Cow&lt;<span class="lifetime">&#39;a</span>, str&gt;&gt;,
         V: Into&lt;Cow&lt;<span class="lifetime">&#39;a</span>, str&gt;&gt;,
     {
         <span class="self">self</span>.write_style = Var::new_with_default(write_style_env, default);

         <span class="self">self
     </span>}

     <span class="doccomment">/// Use the default environment variable to read the style from.
     ///
     /// If the variable is not set, the default value will be used.
     </span><span class="kw">pub fn </span>default_write_style_or&lt;V&gt;(<span class="kw-2">mut </span><span class="self">self</span>, default: V) -&gt; <span class="self">Self
     </span><span class="kw">where
         </span>V: Into&lt;Cow&lt;<span class="lifetime">&#39;a</span>, str&gt;&gt;,
     {
         <span class="self">self</span>.write_style = Var::new_with_default(DEFAULT_WRITE_STYLE_ENV, default);

         <span class="self">self
     </span>}

     <span class="kw">fn </span>get_write_style(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;String&gt; {
         <span class="self">self</span>.write_style.get()
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Var&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="kw">fn </span>new&lt;E&gt;(name: E) -&gt; <span class="self">Self
     </span><span class="kw">where
         </span>E: Into&lt;Cow&lt;<span class="lifetime">&#39;a</span>, str&gt;&gt;,
     {
         Var {
             name: name.into(),
             default: <span class="prelude-val">None</span>,
         }
     }

     <span class="kw">fn </span>new_with_default&lt;E, V&gt;(name: E, default: V) -&gt; <span class="self">Self
     </span><span class="kw">where
         </span>E: Into&lt;Cow&lt;<span class="lifetime">&#39;a</span>, str&gt;&gt;,
         V: Into&lt;Cow&lt;<span class="lifetime">&#39;a</span>, str&gt;&gt;,
     {
         Var {
             name: name.into(),
             default: <span class="prelude-val">Some</span>(default.into()),
         }
     }

     <span class="kw">fn </span>get(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;String&gt; {
         env::var(<span class="kw-2">&amp;*</span><span class="self">self</span>.name)
             .ok()
             .or_else(|| <span class="self">self</span>.default.to_owned().map(|v| v.into_owned()))
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, T&gt; From&lt;T&gt; <span class="kw">for </span>Env&lt;<span class="lifetime">&#39;a</span>&gt;
 <span class="kw">where
     </span>T: Into&lt;Cow&lt;<span class="lifetime">&#39;a</span>, str&gt;&gt;,
 {
     <span class="kw">fn </span>from(filter_env: T) -&gt; <span class="self">Self </span>{
         Env::default().filter(filter_env.into())
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Default <span class="kw">for </span>Env&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
         Env {
             filter: Var::new(DEFAULT_FILTER_ENV),
             write_style: Var::new(DEFAULT_WRITE_STYLE_ENV),
         }
     }
 }

 <span class="kw">mod </span>std_fmt_impls {
     <span class="kw">use super</span>::<span class="kw-2">*</span>;
     <span class="kw">use </span>std::fmt;

     <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>Logger {
         <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
             f.debug_struct(<span class="string">&quot;Logger&quot;</span>)
                 .field(<span class="string">&quot;filter&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.filter)
                 .finish()
         }
     }

     <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>Builder {
         <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
             <span class="kw">if </span><span class="self">self</span>.built {
                 f.debug_struct(<span class="string">&quot;Logger&quot;</span>).field(<span class="string">&quot;built&quot;</span>, <span class="kw-2">&amp;</span><span class="bool-val">true</span>).finish()
             } <span class="kw">else </span>{
                 f.debug_struct(<span class="string">&quot;Logger&quot;</span>)
                     .field(<span class="string">&quot;filter&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.filter)
                     .field(<span class="string">&quot;writer&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.writer)
                     .finish()
             }
         }
     }
 }

 <span class="doccomment">/// Attempts to initialize the global logger with an env logger.
 ///
 /// This should be called early in the execution of a Rust program. Any log
 /// events that occur before initialization will be ignored.
 ///
 /// # Errors
 ///
 /// This function will fail if it is called more than once, or if another
 /// library has already initialized a global logger.
 </span><span class="kw">pub fn </span>try_init() -&gt; <span class="prelude-ty">Result</span>&lt;(), SetLoggerError&gt; {
     try_init_from_env(Env::default())
 }

 <span class="doccomment">/// Initializes the global logger with an env logger.
 ///
 /// This should be called early in the execution of a Rust program. Any log
 /// events that occur before initialization will be ignored.
 ///
 /// # Panics
 ///
 /// This function will panic if it is called more than once, or if another
 /// library has already initialized a global logger.
 </span><span class="kw">pub fn </span>init() {
     try_init().expect(<span class="string">&quot;env_logger::init should not be called after logger initialized&quot;</span>);
 }

 <span class="doccomment">/// Attempts to initialize the global logger with an env logger from the given
 /// environment variables.
 ///
 /// This should be called early in the execution of a Rust program. Any log
 /// events that occur before initialization will be ignored.
 ///
 /// # Examples
 ///
 /// Initialise a logger using the `MY_LOG` environment variable for filters
 /// and `MY_LOG_STYLE` for writing colors:
 ///
 /// ```
 /// # extern crate env_logger;
 /// use env_logger::{Builder, Env};
 ///
 /// # fn run() -&gt; Result&lt;(), Box&lt;::std::error::Error&gt;&gt; {
 /// let env = Env::new().filter(&quot;MY_LOG&quot;).write_style(&quot;MY_LOG_STYLE&quot;);
 ///
 /// env_logger::try_init_from_env(env)?;
 ///
 /// Ok(())
 /// # }
 /// # fn main() { run().unwrap(); }
 /// ```
 ///
 /// # Errors
 ///
 /// This function will fail if it is called more than once, or if another
 /// library has already initialized a global logger.
 </span><span class="kw">pub fn </span>try_init_from_env&lt;<span class="lifetime">&#39;a</span>, E&gt;(env: E) -&gt; <span class="prelude-ty">Result</span>&lt;(), SetLoggerError&gt;
 <span class="kw">where
     </span>E: Into&lt;Env&lt;<span class="lifetime">&#39;a</span>&gt;&gt;,
 {
     <span class="kw">let </span><span class="kw-2">mut </span>builder = Builder::from_env(env);

     builder.try_init()
 }

 <span class="doccomment">/// Initializes the global logger with an env logger from the given environment
 /// variables.
 ///
 /// This should be called early in the execution of a Rust program. Any log
 /// events that occur before initialization will be ignored.
 ///
 /// # Examples
 ///
 /// Initialise a logger using the `MY_LOG` environment variable for filters
 /// and `MY_LOG_STYLE` for writing colors:
 ///
 /// ```
 /// use env_logger::{Builder, Env};
 ///
 /// let env = Env::new().filter(&quot;MY_LOG&quot;).write_style(&quot;MY_LOG_STYLE&quot;);
 ///
 /// env_logger::init_from_env(env);
 /// ```
 ///
 /// # Panics
 ///
 /// This function will panic if it is called more than once, or if another
 /// library has already initialized a global logger.
 </span><span class="kw">pub fn </span>init_from_env&lt;<span class="lifetime">&#39;a</span>, E&gt;(env: E)
 <span class="kw">where
     </span>E: Into&lt;Env&lt;<span class="lifetime">&#39;a</span>&gt;&gt;,
 {
     try_init_from_env(env)
         .expect(<span class="string">&quot;env_logger::init_from_env should not be called after logger initialized&quot;</span>);
 }

 <span class="doccomment">/// Create a new builder with the default environment variables.
 ///
 /// The builder can be configured before being initialized.
 </span><span class="kw">pub fn </span>builder() -&gt; Builder {
     Builder::from_default_env()
 }

 <span class="doccomment">/// Create a builder from the given environment variables.
 ///
 /// The builder can be configured before being initialized.
 </span><span class="kw">pub fn </span>from_env&lt;<span class="lifetime">&#39;a</span>, E&gt;(env: E) -&gt; Builder
 <span class="kw">where
     </span>E: Into&lt;Env&lt;<span class="lifetime">&#39;a</span>&gt;&gt;,
 {
     Builder::from_env(env)
 }

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

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>env_get_filter_reads_from_var_if_set() {
         env::set_var(<span class="string">&quot;env_get_filter_reads_from_var_if_set&quot;</span>, <span class="string">&quot;from var&quot;</span>);

         <span class="kw">let </span>env = Env::new().filter_or(<span class="string">&quot;env_get_filter_reads_from_var_if_set&quot;</span>, <span class="string">&quot;from default&quot;</span>);

         <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;from var&quot;</span>.to_owned()), env.get_filter());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>env_get_filter_reads_from_default_if_var_not_set() {
         env::remove_var(<span class="string">&quot;env_get_filter_reads_from_default_if_var_not_set&quot;</span>);

         <span class="kw">let </span>env = Env::new().filter_or(
             <span class="string">&quot;env_get_filter_reads_from_default_if_var_not_set&quot;</span>,
             <span class="string">&quot;from default&quot;</span>,
         );

         <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;from default&quot;</span>.to_owned()), env.get_filter());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>env_get_write_style_reads_from_var_if_set() {
         env::set_var(<span class="string">&quot;env_get_write_style_reads_from_var_if_set&quot;</span>, <span class="string">&quot;from var&quot;</span>);

         <span class="kw">let </span>env =
             Env::new().write_style_or(<span class="string">&quot;env_get_write_style_reads_from_var_if_set&quot;</span>, <span class="string">&quot;from default&quot;</span>);

         <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;from var&quot;</span>.to_owned()), env.get_write_style());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>env_get_write_style_reads_from_default_if_var_not_set() {
         env::remove_var(<span class="string">&quot;env_get_write_style_reads_from_default_if_var_not_set&quot;</span>);

         <span class="kw">let </span>env = Env::new().write_style_or(
             <span class="string">&quot;env_get_write_style_reads_from_default_if_var_not_set&quot;</span>,
             <span class="string">&quot;from default&quot;</span>,
         );

         <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;from default&quot;</span>.to_owned()), env.get_write_style());
     }
 }
 </code></pre></div>
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