if [ -z "$SAGE_LOCAL" ]; then
    echo >&2 "SAGE_LOCAL undefined ... exiting"
    echo >&2 "Maybe run 'sage --sh'?"
    exit 1
fi

widgets_ver=`cat package-version.txt`

if [ $? -ne 0 ]; then
    echo "Error determining which jupyter-widgets version to install ... exiting"
    exit 1
fi

jupyter labextension install "@jupyter-widgets/jupyterlab-manager@$widgets_ver"

if [ $? -ne 0 ]; then
    echo "Error installing jupyter-widgets extension into jupyterlab ... exiting"
    exit 1
fi
