Tool for suggesting improvements to Haskell code. More information: http://hackage.haskell.org/package/hlint.
hlint {{path/to/file}} options
hlint {{path/to/directory}} --report
hlint {{path/to/file}} --refactor
hlint {{path/to/file}} --refactor-options
hlint {{path/to/file}} --default > {{.hlint.yaml}}