The highlight is the move to a new DSL for filters. Previously, filters were a type alias:

type Filter = LogLine => Boolean

This has changed to be an enum-based DSL:

enum Filter:
  private[woof] case AtLeastLevel(level: LogLevel)
  private[woof] case ExactLevel(level: LogLevel)
  private[woof] case ClassRegex(regex: Regex)
  private[woof] case MessageFilter(filter: String => Boolean)
  private[woof] case LineNumberFilter(filter: Int => Boolean)
  private[woof] case CompositeAnd(a: Filter, b: Filter)
  private[woof] case CompositeOr(a: Filter, b: Filter)
  private[woof] case Nothing
  private[woof] case Everything
end Filter

with the same Monoid instance and syntax as before:

  given Monoid[Filter] with
    def empty: Filter                         = nothing
    def combine(f: Filter, g: Filter): Filter = f or g

  extension (f: Filter)
    infix def and(g: Filter): Filter = Filter.CompositeAnd(f, g)
    infix def or(g: Filter): Filter  = Filter.CompositeOr(f, g)

For code using compositions of the pre-defined filters, this should not be a breaking change. However, if you have a custom filter, you need to migrate to some composition of the filters in the companion object of Filter. We realize that this is a reduction in power, but depending on your filter configuration there should be a considerable speedup as compensation:

[info] Benchmark                        Mode  Cnt      Score     Error  Units
[info] FilterBenchmark.testEverything  thrpt   25    255,250 ±  12,763  ops/s
[info] FilterBenchmark.testInfo        thrpt   25    722,664 ±  25,608  ops/s
[info] FilterBenchmark.testNothing     thrpt   25  11275,189 ± 314,631  ops/s
[success] Total time: 1509 s (25:09), completed 31 Mar 2023, 10.38.35

See modules/benchmarks/FilterBenchmark.scala.output.md for the full benchmark results and treatment.

What's Changed

• Upgrade scalafmt-core from 3.7.2 to 3.7.3 by @scala-steward in https://github.com/LEGO/woof/pull/143
• Upgrade nscplugin, sbt-scala-native, ... from 0.4.11 to 0.4.12 by @scala-steward in https://github.com/LEGO/woof/pull/142
• 140: #140 implement applicative filter DSL by @hejfelix in https://github.com/LEGO/woof/pull/141

Full Changelog: https://github.com/LEGO/woof/compare/v0.5.1...v0.6.0