logging

Simplified logging in IO for application writers.

Latest on Hackage:3.0.4

This package is not currently in any snapshots. If you're interested in using it, we recommend adding it to Stackage Nightly. Doing so will make builds more reliable, and allow stackage.org to host generated Haddocks.

MIT licensed by John Wiegley, Roy Blankman
Maintained by riblankman@gmail.com

logging is a wrapper around fast-logger which makes it easy to log from IO. It provides the following conveniences on top of those libraries:

  • A set of shorter functions to type: debug, log, warn, plus others that flush after each message, or which allow providing a message source string.

  • Logging variants of error, trace and traceShow, called errorL, traceL and traceShowL. These use unsafePerformIO in order to act as direct replacements, so the usual caveats apply.

  • A global function, setDebugLevel, which uses a global IORef to record the logging level, saving you from having to carry around the notion of "verbosity level" in a Reader environment.

  • A set of "timed" variants, timedLog and timedDebug, which report how long the specified action took to execute in wall-clock time.

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