pre-commit hook to PEP8-check the code

pre-commit

#!/bin/sh
# vim: et ts=4 sw=4 ft=sh

# Interesting post on max line length:
# http://stackoverflow.com/questions/88942/why-should-python-pep-8-specify-a-maximum-line-length-of-79-characters

PEP8_OPTIONS='--max-line-length=120'


RED=`echo -e "\033[1;31m"`
YELLOW=`echo -e "\033[0;33m"`
CYAN=`echo -e "\033[0;36m"`
RESET=`echo -e "\033[0;0m"`
BRIGHTYELLOW=`echo -e "\033[1;33m"`
WHITE=`echo -e "\033[1;37m"`

RE="s/\([^:]*\):\([0-9]*\):\([0-9]*\): \([EW][0-9]*\) \(.*\)/$WHITE[$CYAN\1$RESET $BRIGHTYELLOW\2:\3$WHITE] $RED\4 $YELLOW\5$RESET/g"

STATUS=0

for FILE in `git diff-index --name-status HEAD | awk '{print $2}'`;
do
    RESULT=`git diff --cached $FILE | python -W ignore -m pep8 --diff $PEP8_OPTIONS`
    RC=$?
    if [[ $RC != 0 ]] ; then
        if [[ $STATUS == 0 ]] ; then
            echo "${RED}There are PEP8 issues in your code:${RESET}"
        fi
        STATUS=1
    fi
    if [[ -n "$RESULT" ]] ; then
        echo "$RESULT" | sed -e "$RE"
    fi
done

if [[ $STATUS != 0 ]] ; then
    # claim stdin back
    exec < /dev/tty
    echo
    read -p "${RED}Do you wish to commit it anyway ${CYAN}[${WHITE}y${CYAN}/${WHITE}N${CYAN}]${RESET}? " yn
    case $yn in
        [Yy]* ) exit 0; break;;
        [Nn]* ) exit $STATUS;;
        * ) exit $STATUS;;
    esac
    # close stdin
    exec <&-
fi

exit $STATUS