Use stylish-haskell on many files at once.

hs-stylize.sh

#! /bin/sh

# Script that automatically runs stylish-haskell on the given file
# or every file in the given directory and its subdirectories.
# Written by Hector A Escobedo

if ! hash sponge 2> /dev/null
then
    echo "The sponge dependency from moreutils is missing."
    exit 1
fi

if ! hash stylish-haskell 2> /dev/null
then
    echo "The stylish-haskell dependency is missing."
    exit 1
fi

if [ -d "$1" ]
then
  for f in `find $1 -type f`
  do
    stylish-haskell $f | sponge $f
  done
elif [ -f "$1" ]
then
  stylish-haskell $1 | sponge $1
else
  echo "Usage: hs-stylize DIRECTORY/FILE"
  exit 2
fi