pre-commit

#!/bin/bash -
###############################################################################
# File:          js-validation-git-pre-commit-hook.sh
#
# Description:   Git pre-commit that checks your code for js errors before you commit it
#
# Prerequisites: - jshint to install run: "npm install jshint -g"
#                - .git/hooks/reporter.js file
#                - .jshintignore file
#
# Todo: Need to translate .jshintignore into corresponding regex
#		(e.g. '*.js' with '.*.js')
#
# About:  http://jt.io/2013/git-pre-commit-js-lint-script/
#
###############################################################################


# Verifying pre-requisites:
EXIT_CODE=0
which jshint &> /dev/null
EXIT_CODE=`expr ${EXIT_CODE} + $?`
ls -l .git/hooks/reporter.js &> /dev/null
EXIT_CODE=`expr ${EXIT_CODE} + $?`
ls -l .jshintignore &> /dev/null
EXIT_CODE=`expr ${EXIT_CODE} + $?`

if [[ ${EXIT_CODE} -ne 0 ]]; then
    echo ""
    echo " -------------------------------------------------"
    echo "|        * * * CANNOT RUN JS LINTING * * *        |"
    echo "|                                                 |"
    echo "| You do not have all the pre-requisites setup!   |"
    echo "| Ask for help: http://bit.ly/something_is_wrong  |"
    echo "|                                                 |"
    echo "| Git commit has been aborted.                    |"
    echo " -------------------------------------------------"
    echo ""
    exit $((${EXIT_CODE}))
fi


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

# Show files about to be commited that do not match filters in .jshintignore and are js files
if [ -s .jshintignore ]; then
  FILES_TO_CHECK=`git diff-index --name-only --cached --diff-filter=ACMRTX ${against} -- | grep -vx -f .jshintignore | grep \.js$ -i`
else
  FILES_TO_CHECK=`git diff-index --name-only --cached --diff-filter=ACMRTX ${against} -- | grep \.js$ -i`
fi

for FILE in ${FILES_TO_CHECK}; do
    jshint ${FILE} >> /dev/null
    EXIT_CODE=`expr ${EXIT_CODE} + $?`
	if [[ ${EXIT_CODE} -ne 0 ]]; then
		break
	fi
done

if [[ ${EXIT_CODE} -ne 0 ]]; then
    echo ""
    echo " ----------------------------------------------- "
    echo "|         * * * E P I C    F A I L * * *        |"
    echo "|                                               |"
    echo "| Some files do not pass JavaScript validation  |"
    echo "| run: 'jshint {filename}' to find out more     |"
    echo "|                                               |"
    echo "| Git commit has been aborted.                  |"
    echo " ----------------------------------------------- "
    echo ""
	jshint --reporter .git/hooks/reporter.js ${FILES_TO_CHECK}
	echo ""
fi

exit $((${EXIT_CODE}))