First pass at improving load times

Project.toml

@@ -2,7 +2,7 @@ name = "Memento"
 uuid = "f28f55f0-a522-5efc-85c2-fe41dfb9b2d9"
 license = "MIT"
 authors = ["Invenia Technical Computing"]
-version = "1.1.0"
+version = "1.1.1"
 
 [deps]
 Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"

src/Memento.jl

@@ -51,6 +51,7 @@ include("config.jl")
 include("exceptions.jl")
 include("memento_test.jl")
 include("deprecated.jl")
+include("precompile.jl")
 
 # Initializing at compile-time will work as long as the loggers which are added do not
 # contain references to stdout.
@@ -65,4 +66,5 @@ function __init__()
     Memento.register(LOGGER)
 end
 
+_precompile_()
 end

src/config.jl

@@ -39,7 +39,8 @@ function config!(
     setpropagating!(logger, propagate)
     handler = DefaultHandler(
         stdout,
-        DefaultFormatter(fmt), Dict{Symbol, Any}(:is_colorized => colorized)
+        DefaultFormatter(fmt),
+        Dict{Symbol, Any}(:is_colorized => colorized),
     )
     logger.handlers["console"] = handler
     register(logger)

src/formatters.jl

@@ -25,11 +25,11 @@ Ex) "[{level} | {name}]: {msg}" will print message of the form
 struct DefaultFormatter <: Formatter
     fmt_str::AbstractString
     tokens::Vector{Pair{Symbol, Bool}}
-    output_tz::Dates.TimeZone
+    output_tz::Union{Dates.TimeZone, Nothing}
 
     function DefaultFormatter(
         fmt_str::AbstractString=DEFAULT_FMT_STRING,
-        output_tz=localzone(),
+        output_tz=nothing,
     )
         #r"(?<={).+?(?=})
         tokens = map(eachmatch(r"({.+?})|(.+?)", fmt_str)) do m
@@ -45,6 +45,7 @@ struct DefaultFormatter <: Formatter
     end
 end
 
+
 """
     format(::DefaultFormatter, ::Record) -> String
 
@@ -77,7 +78,9 @@ function format(fmt::DefaultFormatter, rec::Record)
                 value = string(" stack:[", join(str_frames, ", "), "]")
             elseif content === :date
                 value = if tmp_val isa ZonedDateTime
-                    Dates.format(astimezone(tmp_val, fmt.output_tz), DATE_FMT_STRING)
+                    # `localzone` is expensive, so we don't call it until it is required.
+                    tzout = fmt.output_tz === nothing ? localzone() : fmt.output_tz
+                    Dates.format(astimezone(tmp_val, tzout), DATE_FMT_STRING)
                 elseif tmp_val isa DateTime
                     Dates.format(tmp_val, DATE_FMT_STRING)
                 else

src/precompile.jl

@@ -0,0 +1,4 @@
+function _precompile_()
+    # Precompiling this one methods seems to cut our allocations during package loading in half.
+    @assert precompile(Tuple{typeof(Base.log), Memento.Logger, Memento.DefaultRecord})
+end