trailing-whitespace

#!/bin/sh

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

for diff in `git diff-index --check --cached ${against} -- |
  grep 'trailing whitespace' | sed 's/: trailing whitespace.//'`
do
  file=`echo "${diff}" | sed 's/:[^:]*$//'`
  line=`echo "${diff}" | sed 's/^[^:]*://'`
  ext="${file##*.}"

  case "${ext}" in
    cs|rb|sh)
      tempfile=${file}.tempfile
      sed -e "${line}"'s/\s*$//' "${file}" >"${tempfile}"
      mv "${tempfile}" "${file}"
      git add "${file}"
    ;;
  esac
done

exit 0