Logging macros which delegate to a specific logging implementation.

A logging implementation is selected at runtime when this namespace is first
loaded. For more details, see the documentation for *logger-factory*.

If you want to test that your code emits specific log messages, see the
clojure.tools.logging.test namespace.

Protocols used to allow access to logging implementations.
This namespace only need be used by those providing logging
implementations to be consumed by the core api.

Support for testing whether logging calls are made.

Usage example:
  (require '[clojure.tools.logging :as log]
           '[clojure.tools.logging.test :refer [logged? with-log])

  (with-log
    (log/info "Hello World!")
    (log/error (Exception. "Did a thing") "Error: oops")
    (logged? 'user :info #"Hello")                             ; true
    (logged? 'user :error [Throwable #"thing"] #"Error:")    ; true
    (logged? 'user :debug "Hi"))                               ; false