export def --env "pj uvthu" [] {
    let os_name = ($nu.os-info.name? | default "" | into string | str downcase)
    if not (($os_name | str contains "darwin") or ($os_name | str contains "macos")) {
        return
    }

    let uv_index_url = ($env.UV_INDEX_URL? | default "")

    if ($uv_index_url | is-empty) {
        load-env {
            UV_INDEX_URL: "https://mirrors.tuna.tsinghua.edu.cn/pypi/web/simple/"
        }
    } else {
        hide-env UV_INDEX_URL
    }
}