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log4cl

This is the mystery why I didn’t review any logging library so far! Probably, because there is a great article exists which compares 8 logging libraries.

Today I want only mention that my library of choice is log4cl. Mostly because if it’s great integration with SLIME/SLY which helps when you have a lot’s of “debug” logging in the app, but at some moment want to turn it on only for a function or a package.

Log4cl has great documentation which demonstrates all its features. Here I’ll provide only a small example of its default logging output and ability to process additional arguments:

POFTHEDAY> (log:config :sane2 :debug)

POFTHEDAY> (defun foo (first-arg second-arg)
             (log:info "Entering into the foo with" first-arg "and" second-arg))

POFTHEDAY> (foo 100500 "Blah")

 <INFO> [21:04:10] poftheday (foo) -
  Entering into the foo with FIRST-ARG: 100500 and SECOND-ARG: "Blah" 

;; Now I want to process arguments with in format-like style:

POFTHEDAY> (defun foo (first-arg second-arg)
             (log:info "Entering into the (foo ~A ~A)" first-arg second-arg))

POFTHEDAY> (foo 100500 "Blah")
 <INFO> [21:04:53] poftheday (foo) - Entering into the (foo 100500 Blah)

Tomorrow I’ll show you addons I’ve made, to make log4cl even more suitable for production applications.