0.8.4

Improvements:

• Allow writing logs to a custom output target (via Target::Pipe)

Bug fixes:

• Actually allow overriding filter levels using env_logger::Builders methods, as documented

0.8.3

New features:

• Suffix customization for the default formatter (Builder::format_suffix) [#192]

Improvements:

• Improve documentation about log level names [#189]

Bug fixes:

• Ignore whitespace-only filter specifications [#188]
• Remove unneded files from crates.io tarball (including rust-toolchain whose presence caused issues for a few people)

0.8.2

Fixed a panic on io errors when writing to stdout / stderr (#184).

0.8.1

Update links in the documentation that were pointing to the old repository location.

0.8.0

Breaking changes:

• Update public dependency humantime to 2.0

Improvements:

• Update default colors for debug (white => blue) and trace (black => cyan)

Deprecations:

• env_logger::from_env has been deprecated in favor of env_logger::Builder::from_env

This release raises the minimum supported Rust version to 1.41.0.

0.7.1

Key Changes

• More thread-local durability

Contributions

• @divergentdave Thread local fallback

0.7.0

Key Changes

• Indent multiline messages by default
• Support more timestamp precision
• Update to the 2018 edition

Changes to minimum Rust

The minimum version of Rust required has been set at 1.31.0. We may change this in patch versions, but will always flag it in the release notes here.

You can always check the .travis.yml file to see the current minimum supported version.

Contributions

• @95ulisse Indentation for multiline log messages
• @oherrala Add more timestamp precisions
• Update to 2018 edition

0.6.2

Key Changes

• Additional examples and docs

Contributions

• @shepmaster Redirect people to GitHub Releases for changesn
• Fix up test init example
• Add some more examples for configuring env_logger
• Fix up the build on nightly compilers

0.6.1

Key Changes

• Support better capturing for cargo test
• Don't print internal logs to stdout

Contributions

• @nlopes Fix path for rust-lang favicon
• @emilio Don't print to stdout the warnings due to an invalid spec
• Support capturing for cargo test

More Details

Builder::is_test

The is_test method can be used in tests to make sure logs are captured by cargo test the same way println! is:

fn init() {
    let _ = env_logger::builder().is_test(true).try_init();
}

#[test]
fn it_adds_one() {
    init();

    info!("can log from the test too");
    assert_eq!(3, add_one(2));
}

There are performance implications of using is_test though, so it should be avoided outside of unit tests.

0.6.0

Key Changes

• Set a policy for changes to the default format
• Make all dependencies besides log optional (but enabled by default)

Breaking Changes

• The default format is not considered stable across patch versions. The best way to get a stable format for later ripgrepping is to define a custom one.
• All dependencies have been made optional except for log. That means compiling env_logger with default-features=false will result in a different experience than in 0.5.x.

Contributions

• @hcpl Test with -Z minimal-versions on CI
• @afck Add missing RFC3339 URL to fix rustdoc
• Make all dependencies optional
• Rework the default format
• Don't clobber a previously set level filter

More Details

Disabling dependencies

Using default-features=false will disable all dependencies of env_logger besides log. This will reduce compile times and alter the default format by disabling colours and timestamps.

Disabling default dependencies is the recommended way to use env_logger for libraries that only need it for logging in tests.