Git PEP 8 pre commit hook

pre-commit

#!/bin/bash

echo "Pre-commit started"
echo "PEP 8"

git diff  --cached --name-only | grep .py | grep -v old_ | xargs autopep8 --in-place -v --aggressive --aggressive
git diff  --cached --name-only | grep .py | grep -v old_ | xargs git add
git diff  --cached --name-only | grep .py | grep -v old_ | xargs pep8

if [ $? == 0 ]
then
    exit 0
fi

# Allows us to read user input below, assigns stdin to keyboard
exec < /dev/tty

echo "Do you want to ignore warning?"
select yn in "Yes" "No"; do
    case $yn in
        Yes ) exit 0;;
        No ) exit 1;;
    esac
done