pre-commit hook I use for PocketMine-MP

pre-commit

#!/usr/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

errors=0

IFS=$'\n' FILENAMES=$(git diff --cached --name-only | grep ".php")
for (( i=0; i<${#FILENAMES[@]}; i++ ))
do
	if [ -f "${FILENAMES[$i]}" ]; then
		OUTPUT=$(git grep -h --cached ^ -- "${FILENAMES[$i]}" | php -l )
		if [ $? -ne 0 ]; then
			echo -n "${FILENAMES[$i]} lint scan failed: "
			echo $OUTPUT
			((errors++))
		fi
	fi
done

if [ $errors -gt 0 ]; then
	echo "$errors files failed lint scan"
	exit 1
fi


# If there are whitespace errors, print the offending file names and fail.
git diff-index --check --cached $against -- || exit 1
#exec git diff --check 4b825dc642cb6eb9a060e54bf8d69288fbee4904
#exec php phpunit.phar --bootstrap vendor/autoload.php tests/phpunit