a jshint pre-commit hook for git

gistfile1.sh

#!/bin/bash
# A pre-commit hook for git to lint JavaScript files with jshint
# @see https://github.com/jshint/jshint/
#
# @see http://blog.founddrama.net/2011/06/jshint-pre-commit-hook-for-git
# @see https://gist.github.com/1013614
#
# Modified by fs@it-agenten.com 2012-05-22 for node.js and explicit /bin/bash

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)
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}))