: ${XDG_CACHE_HOME:=$HOME/.cache}
declare -A direnv_layout_dirs
direnv_layout_dir() {
    local hash path
    echo "${direnv_layout_dirs[$PWD]:=$(
        hash="$(sha1sum - <<< "$PWD" | head -c40)"
        path="${PWD//[^a-zA-Z0-9]/-}"
        echo "${XDG_CACHE_HOME}/direnv/layouts/${hash}${path}"
    )}"
}