git-refactor

#!/usr/bin/env bash -e

FROM=$1
TO=$2

if [ "$#" -ne 2 ]
then
  echo "Usage: git refactor word_to_find word_to_replace"
  exit 1
fi

echo "replacing all instances of $FROM with $TO"
for filename in $(git grep -l $FROM); do
    echo "refactoring $filename"
    sed s/$FROM/$TO/g $filename > $filename.bak
    mv $filename.bak $filename
done;