git pre-commit hook

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/^[^:]*://'`

  sed -i '' -e "$line"'s/ *$//' "$file"
  git add "$file"
done

exit 0