LicenseRef-Apache licensed and maintained by Matthew Parsons
This version can be pinned in stack with:monad-logger-prefix-0.1.10@sha256:7d407feaed6a3e3b4fcb82a72582ee696a48fe838da57335909f66d5dd8707f4,2080

Module documentation for 0.1.10


Build Status

This package provides an easy way to add prefixes to any MonadLogger. Here’s a brief example:

{-# LANGUAGE TemplateHaskell #-}

import Control.Monad.Logger
import Control.Monad.Logger.Prefix

main :: IO ()
main = runStdoutLoggingT $ do
    $(logDebug) "This one has no prefix."

    "foo" `prefixLogs` do
        $(logDebug) "This one has a [foo] prefix."

        "bar" `prefixLogs` do
            $(logDebug) "This one has both [foo] and [bar] prefixes."

The package includes a benchmark demonstrating that there is no performance difference with ordinary logging.


Change log


  • Relaxed upper bound on exceptions from 0.10 to 0.11


  • Relaxed upper bound on exceptions from 0.9 to 0.10


  • Relaxed upper bound on conduit