pre-commit

#!/bin/bash

if [ -n $VIRTUAL_ENV ]; then
    PATH=$VIRTUAL_ENV/bin:$PATH
fi

REPO=$(pwd)
EXIT_CODE=0

for FILE in `git diff-index --name-only --cached HEAD -- | egrep .js$`; do
    jshint ${REPO}/${FILE}
    EXIT_CODE=$((${EXIT_CODE} + $?))
done
if [[ ${EXIT_CODE} -ne 0 ]]; then
    echo "Aborted due to JSHint errors."
    exit $EXIT_CODE
fi

for FILE in `git diff-index --name-only --cached HEAD -- | egrep .py$`; do
    flake8 ${REPO}/${FILE} --max-complexity=10
    EXIT_CODE=$((${EXIT_CODE} + $?))
done
if [[ ${EXIT_CODE} -ne 0 ]]; then
    echo "Aborted due to flake8 errors."
    exit $EXIT_CODE
fi

exit $EXIT_CODE

sudo npm install -g jshint; sudo pip install flake8

From @brianpeiris:

To install this, copy it to a file called pre-commit under THM/.git/hooks/. Then chmod +x pre-commit.