Logging: define isless between Integer and LogLevel (#60330)

Author: EdsterG

base/logging/logging.jl

@@ -129,6 +129,8 @@ end
 LogLevel(level::LogLevel) = level
 
 isless(a::LogLevel, b::LogLevel) = isless(a.level, b.level)
+isless(a::LogLevel, b::Integer) = isless(a.level, b)
+isless(a::Integer, b::LogLevel) = isless(a, b.level)
 +(level::LogLevel, inc::Integer) = LogLevel(level.level+inc)
 -(level::LogLevel, inc::Integer) = LogLevel(level.level-inc)
 convert(::Type{LogLevel}, level::Integer) = LogLevel(level)

stdlib/Logging/test/runtests.jl

@@ -19,6 +19,13 @@ macro customlog(exs...) Base.CoreLogging.logmsg_code((Base.CoreLogging.@_sourcei
     @test :handle_message in names(Logging, all=true)  # non-exported public function
 end
 
+@testset "LogLevel compatibility with integers" begin
+    @test Logging.Debug + 1000 == Logging.Info
+    @test Logging.Warn - 1000 == Logging.Info
+    @test Logging.Info < 500
+    @test 500 < Logging.Warn
+end
+
 @testset "ConsoleLogger" begin
     # First pass log limiting
     @test min_enabled_level(ConsoleLogger(devnull, Logging.Debug)) == Logging.Debug