A precommit hook for js

gistfile1.sh

#!/bin/sh
# A pre-commit hook for js 
# It runs jshint on js files.

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

EXIT_CODE=0

# @see https://github.com/jshint/jshint/
REPO=$(pwd)
JSHINT_HOME=jshint
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}))