v0.4.0

Highlights / New Features

• Performance is improved by 15% (see Benchmarks), and the performance of PatternFormatter has been significantly improved.
• Most of the documentation and examples have been rewritten, they should now be more friendly to people new to this crate.
• Support constructing PatternFormatter from a runtime string via the new macro runtime_pattern!. (PR #45)
• New formatter JsonFormatter serializes log into a single line of JSON object. (PR #69, thank @NotEvenANeko)
• New sink DedupSink for skipping consecutive repeated logs.
• RotatingFileSink now has a new rotation policy Period rotates after a given period. (PR #74, thank @lioriz)
• New methods on_thread_spawn and on_thread_finish for ThreadPoolBuilder allows to set callbacks for thread spawn and finish. (PR #54, thank @fpervaiz)
• New method Record{,Owned}::tid to get the thread ID when the log was generated.

Improvements / Bug Fixes

• MSRV (minimum supported Rust version) is bumped to v1.60.
• Fixed AsyncPoolSink may lose the last logs and may panic. (PR #66)
• Fallback logger name to the target from log crate if present. (PR #50, thank @Lancern)
• Respect local timezone when rotating files by time point.
• Several internal performance optimizations.

Breaking Changes

• Formatter::clone_box is removed, now it requires all formatters to implement Clone. The inherited DynClone trait enables it to be cloned object-safely.
• FmtExtraInfo{,Builder} has been replaced with FormatterContext, and Formatter::format now has a &mut FormatterContext argument instead of returning Result<FmtExtraInfo>.
• All re-exported log items has been moved from module log_crate to re_export::log.
• Method LevelFilter::compare is renamed to LevelFilter::test. The old method is still available, but has been marked as #[deprecated] and may be removed in a future release.
• Box the RecordOwned in struct SendToChannelErrorDropped to avoid moving large structures on the stack.
• Implementors of Sink::log are no longer required to call should_log to filter logs. Now spdlog-rs will always check first by calling should_log, and only call log when it returns true.
• PatternContext now has 2 new lifetimes.