git pre-commit hook for jshinting before you commit

pre-commit

#!/bin/sh
# A pre-commit hook for git to lint JavaScript files with jshint
# @see https://github.com/jshint/jshint/

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

REPO=$(pwd)
JSHINT=${REPO}/script/utility/jshint
EXIT_CODE=0
for FILE in `git diff-index --name-only ${against} -- | egrep .js`; do

    ${JSHINT} ${REPO}/${FILE}

    EXIT_CODE=$((${EXIT_CODE} + $?))
done

if [[ ${EXIT_CODE} -ne 0 ]]; then
    echo ""
    echo "JSHint detected syntax problems."
    echo "Commit aborted."
fi

exit $((${EXIT_CODE}))