pipenv-python-version

# Detect Python-version with Pipenv.

if [[ -f $BUILD_DIR/Pipfile.lock ]]; then

    if [[ ! -f $BUILD_DIR/runtime.txt ]]; then
        if [[ ! -f Pipfile.lock ]]; then
            pipenv lock 2> /dev/null
        fi

        set +e
        PYTHON=$(cat $BUILD_DIR/Pipfile.lock | jq '._meta.requires.python_version' -r)
        set -e

        if [ "$PYTHON" = 2.7 ]; then
            echo "python-2.7.13" > $BUILD_DIR/runtime.txt
        fi
        if [ "$PYTHON" = 3.6 ]; then
            echo "python-3.6.0" > $BUILD_DIR/runtime.txt
        fi
    fi
fi