I have several command-line tools that support a verbosity flag. The Cabal library provides an appropriate data type and related reporting functions: https://hackage.haskell.org/package/Cabal-2.0.0.2/docs/Distribution-Verbosit... https://hackage.haskell.org/package/Cabal-2.0.0.2/docs/Distribution-Simple-U... However, Cabal moves pretty fast (frequent version increments) and I do not need all the distribution stuff. Is there a package that provides only the Verbosity and reporting functionality?