git-hooks-pre-commit

#!/bin/sh
# Copied mostly from .git/hooks/pre-commit.sample
# Should be placed in .git/hooks/pre-commit inside project dir

if git rev-parse --verify HEAD >/dev/null 2>&1
then
	against=HEAD
else
	# Initial commit: diff against an empty tree object
	against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi

error_msg() {
  RED=$(tput setaf 1)
  RESET=$(tput sgr0)
  warning=$1
  files=$2
  echo "${RED}WARNING! Aborting commit."
  echo "If everything is good to commit, force commit with 'git commit -n'"
  echo
  echo "${warning}${RESET}"
  echo "${files}"
}

# Redirect output to stderr.
exec 1>&2

files=$(git diff-index --cached $against -S'XXX' --name-only --)
if [ "${files}" ]
then
  error_msg "There are warning comments ('XXX') in following files:" "${files}"
  exit 1
fi

# If there are whitespace errors, print the offending file names and fail.
files=$(git diff-index --cached $against --check --)
if [ "${files}" ]
then
  error_msg "There are whitespace warnings in the following files:" "${files}"
  exit 1
fi