Auto-activate venv

script.sh

function cd() {
        builtin cd "$@"

        if [[ -z "$VIRTUAL_ENV" ]] ; then
                if [[ -d ./venv ]] ; then
                        source ./venv/bin/activate
                fi
        else
                parentdir="$(dirname "$VIRTUAL_ENV")"
                if [[ "$PWD" =~ $parentdir ]] ; then

                else
                        deactivate
                fi
        fi
}