pre-commit

#!/bin/sh

# Figure out what we are comparing to.
if git-rev-parse --verify HEAD >/dev/null 2>&1 ; then
   against=HEAD
else
   # Initial commit: diff against an empty tree object
   against=2ca2a592640b979a4092c19daa1938f9dd1baa46
fi

# Find files with trailing whitespace
for FILE in `exec git diff-index --check --cached $against -- | sed '/^[+-]/d' | sed -E 's/:[0-9]+:.*//' | uniq` ; do
    # Fix them!
    echo "Removing trailing whitespace from $FILE";
    sed -i '' -E 's/[[:space:]]*$//' "$FILE"
    git add "$FILE"
done