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Unreleased

0.7.1 (2024-12-15)

0.7.0 (2024-10-20)

  • Upgrade colored to version 2. This is a breaking change due to colored being exposed in the public API of fern. (thanks @faern for doing the boilerplate here!)
  • Remove most of the unsoundness warning, and update it to reflect fern 0.7.0 fixing the issue.

0.6.2 (2023-03-23)

  • Add security warning for "colored" feature when using a global allocator to doc homepage and README.md. See fern-0.6.2 README.md
  • Change examples to use env_logger-style formatting
  • Improve main documentation example explanation
  • Misc. style improvements (clippy lint fixes which have no functional change)

0.6.1 (2022-04-15)

  • Document reopen feature requiring a feature flag (thanks @Palladinium!)
  • Fix typo in colors documentation (thanks @sourcefrog!)
  • Add support for reopen v1 under reopen-1 feature (thanks @vorner!)
  • Add syslog v6 support under syslog-6 feature (thanks folk at @EasyPost!)
  • Fix README badges

0.6.0 (2020-03-09)

  • Move date-based file logger under its own feature (thanks @dekellum!)

0.5.9 (2019-10-23)

  • Add a rotating date-based file logger (thanks @tanujitghosh!)
  • Add a file logger which supports reopening files on SIGHUP via the reopen crate (thanks @itkovian!)
  • Ensure Windows console colors are enabled whenever a ColoredLevelConfig is created on Windows (thanks @Songtronix!)
  • Change minimum rust version from 1.16 to 1.32, as it had already been effectively changed by a patch update in one of our dependencies (cfg-if)
  • Update crate to Rust 2018 edition (thanks @tymcauley!)

0.5.8 (2019-03-25)

  • Change syslog feature to no longer re-export anything on Windows. Previously, using syslog on windows would simply fail to compile. (thanks @17dec!)
  • Fix log_enabled! macro only checking dispatch at surface and not at sub-levels. Actually logging still only does a shallow check, but now log_enabled!() should be actually accurate.

0.5.7 (2018-11-11)

  • Fix colored log level display to honor formatting flags such as "{:>5}" (thanks @ExpHP!)

0.5.6 (2018-06-19)

  • Add another fuller example for colored logging (thanks @digitalatigid!)
  • Add support for syslog version 4.0.0 under feature flag syslog-4.
    • Does not remove syslog-3 support
    • Includes support for RFC5424 formatting, but requires manually transforming the log record into the key/value pairs syslog expects.
  • Add shorthand for calling an arbitrary function as a logging backend

0.5.5 (2018-03-25)

  • Add a log handler for logging into an arbitrary Write object. (thanks @vorner!)

0.5.4 (2018-02-17)

  • Add a log handler which panics on all messages. This can be used in test configurations to turn warning or error messages into hard errors.
  • meta: add test coverage reporting via tarpaulin and coveralls

0.5.3 (2018-02-04)

  • Add support for Display::fmt implementations which call the global logger via a 'meta-logging-in-format' flag. (thanks @jakunar!)
    • This is disabled by default, see 'meta' module for more info.

0.5.2 (2018-01-02)

  • Re-add compatibility for rust versions 1.16.0+, and add CI testing with rustc 1.16.0 to ensure this is kept in the future.
  • Add some more general documentation updates and clarity increases.
  • Add a CHANGELOG.md which mirrors git tag releases.
  • Update documentation links to point to docs.rs rather than custom hosted documentation.
  • Fix ColoredLevelConfig::default being an inherent method rather than an implementation of the Default trait.
  • Add direct support for the syslog crate under the "syslog-3" feature flag.
    • Add a module worth of documentation for using fern with syslog.

0.5.1 (2017-12-26)

  • Re-add support for colored log levels with the 'colored' feature
    • Support for this was accidentally dropped in 0.5.0.
  • Fix the ability to run tests on windows, and refactor integration tests for developer clarity
  • Update documentation for clarity

Short list of changes in 0.5.0:

  • Updated from log 0.3 to log 0.4. Both are interoperable, but using log 0.4 provides a much cleaner log interface for fern to use internally
  • Removed fern::FernLog.
  • Renamed fern::color::ColoredLogLevelConfig to ColoredLevelConfig
  • Greatly simplified testing

0.5.0 (2017-12-25)

  • Update from log 0.3 to log 0.4. Both log versions are interoperable, but line numbers from libraries using 0.4 won't show up in binaries with recievers using log 0.4.
    • To clarify: both fern 0.4 and 0.5 will work perfectly with all libraries, but line numbers will always be 0 if you use fern 0.4 and log 0.4.
  • Remove fern::FernLog. With log 0.4, log records can be constructed directly, and fern loggers can now recieve just a record rather than a record and the formatted display string.
  • Notable changes in the log crate: log::LogLevel is renamed to log::Level, and log::LogLevelFilter is renamed to log::LevelFilter.
  • fern::color::ColoredLogLevelConfig has been renamed to fern::color::ColoredLevelConfig to match log crate renamings.
  • fern tests have been greatly simplified with the new support for creating log records manually. it's now possible to just run "cargo test" and test all of fern's functionality.

0.4.4 (2017-12-22)

  • Add support for coloring log levels in Unix terminals using the 'colored' crate (thanks @nihiluis!)
    • This is enabled via the 'colored' feature, and adds a fern::color module.

0.4.3 (2017-09-20)

  • Add support for sending to an std::sync::mpsc::Sender as a log output (thanks @gingerDevilish!)

0.4.2 (2017-08-20)

  • Documentation hotfix after a premature release of version 0.4.1

0.4.1 (2017-08-20)

  • Lots of documentation tweaks and reworking
  • Add CONTRIBUTING file and update README to invite new contributors
  • Improve example application to be more realistic
  • A few small internal improvements, mostly code cleanup here

0.4.0 (2017-05-09)

  • Rework API surface to be builder-based for simpler configuration

    • Rename DispatchConfig to Dispatch, OutputConfig to Output and FernLogger to FernLog

  • Rework inner log structure for more efficiency

    • Different outputs are now stored in an enum rather than every sublogger being a Box with dynamic dispatch
    • Remove LogError; handle errors within individual loggers now - and only within loggers which actually need it
    • Remove unnecessary wrapping of streams with an Arc (now just uses Mutex for File streams)
    • Remove unnecessary wrapping of Stdout and Stderr streams with a Mutex, when they are already synchronized
    • Pass around just &fmt::Arguments + &log::LogRecord instead of passing each individual LogRecord part

  • Move opening of files and stdout/stderr from configuration "building" to configuring

    • Instead of taking OpenOptions, log configuration now just takes an already-opened std::io::File object
    • fern::InitError is now a convenience API, and is never returned from any fern APIs

  • Redo formatting to work without allocation - formatting closures now finish with a callback rather than returning a value

  • Update examples to use chrono instead of the time crate

    • This removes another extra allocation - chrono can format time directly to a writer, without allocating intermediate the result to a String

  • Add much more documentation: almost every builder method has a full example, and all features should be thoroughly explained

  • Add appveyor and travis-ci badges to README and Cargo.toml

0.3.5 (2015-05-06)

  • Build changes to .travis.yml
  • Add html_root_url doc attribute
  • Add file_with_line_sep and file_with_options_and_line_sep configuration construction options to allow specifying a line separator other than the default '\n'

0.3.4 (2015-04-16)

  • Update for rustc version e9080ec39 (1.0.0-beta.2)
    • Update to use no_test to ignore doc tests, rather than ignore
    • Remove all stability attributes on public types
    • Add rust version matrix for testing on travis, to test on beta as well as nightly builds

0.3.3 (2015-04-03)

  • Update for rustc version 9854143cb (1.0.0-beta)
    • Derive Clone for all types deriving Copy
    • Update docs a bit for that switch to time crate
  • Switch to time crate instead of chrono for tests, as chrono hasn't updated for rustc 1.0.0-beta yet.
  • Instead of implementing a sudo-time crate as a workaround for rust-lang/cargo#1474, just disable the doc test, and copy the code to a separate file in tests/

0.3.2 (2015-04-03)

  • Update to rustc version 2e3b0c051
    • Add a workaround for rust-lang/cargo#1474 in doc tests
    • Implement From for errors instead of FromError
    • Remove now unrequired feature gate
  • Implement error::Error for error types

0.3.1 (2015-03-26)

  • Updates to rustc version 27901849e

0.3.0 (2015-03-25)

  • Updates to rustc version 123a754cb
  • Updates to log version 0.3.0
  • Reworks fern::OutputConfig to be a struct with functions to construct configurations, rather than an enum with variants for each configuration.
    • This is a breaking change, as all constructors on fern::OutputConfig have been renamed from UpperCase to lower_case.
    • This also now allows fern::OutputConfig to be constructed with anything which implements AsRef<path::Path>.
      • For example, fern::OutputConfig::file("some-file.log") works, without having to construct a Path or PathBuf manually.

0.2.1 (2015-03-19)

  • Updates to rustc version 3e4be02b8
  • Updates documentation

0.2.0 (2015-03-08)

This version reworks the public API in order to turn fern into a backend to the log crate.

API Changes:

  • Remove the local module, as the log crate now handles storing a global logger.
  • fern::Logger must now be Sync + Send
  • BoxedLogger and ArcLogger typedefs are removed, due to writing + Sync + Send no longer being required
  • Now everything just uses Box
  • Level is removed, in favor of using log::LogLevel and log::LogLevelFilter
  • LoggerConfig is renamed into DispatchConfig
  • Rename Error to LogError
    • Implement fmt::Display for LogError
  • A new Formatter type is added for formatting closures. It also now takes a &log::LogLocation parameters as well.
  • OutputConfig::Parent is renamed into OutputConfig::Child, this seems to make more sense, given that you can have any number of children
  • Logger::log() now takes (&str, &log::LogLevel, &log::LogLocation) instead of (&fern::Level, &str)
  • Add an IntoLog trait which DispatchConfig and OutputConfig implement (instead of having into_logger() on each of them.
    • Add an into_log() method to the IntoLog trait that turns a log configuration into a log::Log (as apposed to fern::Logger)
    • Rename IntoLog.into_logger() to IntoLog.into_fern_logger() in order to differentiate from the into_log() method.
  • Add a fern::init_global_logger() method which sets the global log crate logger from a log configuration
  • Add an InitError error which is used by init_global_logger() for either an IO error or log::SetLoggerError
  • Update everything to use the new io and path modules
  • Add a FileOptions option to OutputConfig which allows for specifying an OpenOptions for opening the log file with

Additional Changes:

  • The docs have been rewritten to be up to date with all the above changes
    • The code snippets in the docs are now all tested! This is instead of having no_test and not having fully workable code examples.
  • There is a new tests/lib.rs file which contains tests for initializing fern and log filtering with different log levels.

0.1.12 (2015-02-21)

  • Fixes compile warnings and errors for rustc version 522d09dfe (thanks @gareins!)
  • Adds static life bound
  • Switches to using old_path feature instead of path feature

0.1.11 (2015-02-13)

  • Fixes small documentation error
  • Fixes compile errors in rustc version 3ef8ff1f8

0.1.10 (2015-02-03)

  • Finishes updating to rustc version eaf4c5c78
    • Last version compiled, but had many warnings
    • Move all #[experimental] features to #[unstable]
    • Add #![feature(io, core)]
    • Remove unrequired .iter() call

0.1.9 (2015-02-03)

  • Updates to rustc version eaf4c5c78
    • Changes all usages of std::io to std::old_io

0.1.8 (2015-01-27)

  • Updates to rustc version 458a6a2f6

0.1.7 (2015-01-09)

  • Update to latest rustc (44a287e6e)

0.1.6 (2015-01-07)

This update mainly just cleans stuff up and updates for the latest rustc (ea6f65c5f)

  • Update to using f.write_str(... instead of write!(f, "{}", ...) for simplicity
  • Update to use (closure)(...) instead of closure.call((...)) because directly calling works now
  • Remove #![feature()] attributes for unboxed_closures and old_orphan_check, as they are no longer required.

0.1.5 (2015-01-05)

  • Updates for the latest rustc version, ad9e75938.
  • Fixes all lines which go past the 99 character line limit.

0.1.4 (2015-01-01)

This version is not backwards compatible. The change was necessary for the latest rust update however, so only a minor version increment was added.

  • Changes from using IoResult<()> to Result<(), fern::Error> for return types from logging operations.
  • Updates for latest rustc

0.1.3 (2014-12-27)

  • Adds a new public module, local, which stores a thread-local logger.
  • Adds a new logger 'NullLogger', which does nothing with logged mesages.
  • Fixes WriterLogger to append to opened files instead of overwriting.
  • Adds a ton more documentation

0.1.2 (2014-12-24)

  • Adds type aliases BoxedLogger and ArcLogger, which resolve to Box<Logger + Sync + Send> and sync::Arc<Box<Logger + Sync + Send>> respectively.

0.1.1 (2014-12-22)

  • Adds a workaround for a bug introduced a compiler update.

0.1.0 (2014-12-19)

First release, version 0.1.0.