gistfile1.sh

ve() {
    local curdir ve
    curdir="$PWD"
    [ -z "$1" ] && ve="ve" || ve="$1"
    while ! ls -d "$ve" >/dev/null 2>&1; do
        if [ "$PWD" == "/" ]; then
            echo "Cannot find a '$ve' directory on the current path" >&2
            cd $curdir
            return -1
        fi
        cd ..
    done
    echo "Using $PWD"
    source "$ve/bin/activate"
    cd "$curdir"
}