hfmt

hfmt is a tool for formatting Haskell programs. Currently it is simply a gofmt style wrapper of the excellent tools hlint, hindent, and stylish-haskell.

Installation

with stack

$ stack install hfmt

with cabal

$ cabal install hfmt

Usage

Check all Haskell source under the current directory:

hfmt

Overwrite files with formatting suggestions:

hfmt -w

Help text

λ hfmt --help
hfmt - format Haskell programs

Usage: hfmt.exe [-d|--print-diffs] [-s|--print-sources] [-l|--print-paths]
                [-w|--write-sources] [PATH]
  Operates on Haskell source files, reformatting them by applying suggestions
  from HLint, hindent, and stylish-haskell. Inspired by the gofmt utility.

Available options:
  -h,--help                Show this help text
  -d,--print-diffs         If a file's formatting is different, print a diff.
  -s,--print-sources       If a file's formatting is different, print its
                           source.
  -l,--print-paths         If a file's formatting is different, print its path.
  -w,--write-sources       If a file's formatting is different, overwrite it.
  PATH                     Explicit paths to process.
                            - A single '-' will process standard input.
                            - Files will be processed directly.
                            - Directories will be recursively searched for
                              source files to process.
                            - .cabal files will be parsed and all specified
                              source directories and files processed.
                            - If no paths are given, the current directory will
                              be searched for .cabal files to process, if none
                              are found the current directory will be
                              recursively searched for source files to process.