{ pkgs, ... }:
{
  calc = "${pkgs.python313}/bin/python -i ${pkgs.writeText "init.py" ''
    from math import *;
    # import numpy as np

    kilo = 1000
    mega = 1000 * kilo
    giga = 1000 * mega
    tera = 1000 * giga
    peta = 1000 * tera

    b = 1
    kib = 1024
    mib = 1024 * kib
    gib = 1024 * mib
    tib = 1024 * gib
    pib = 1024 * tib

  ''}  ";
  cp-media =
    name: media:
    let
      s = pkgs.writeScriptBin "cp-${name}" ''
        echo "copying to library ${media}"
        echo "calculating hash"
        find "$1" - type f - print0 | sort - z | xargs - 0 sha1sum | awk '{
        print $1}' | sha1sum | awk '{print $1}' > "$1.hash"

        rsync -azP "$1" fili:/media/${media}
        rsync -azP "$1.hash" fili:/media/${media}
      '';
    in
    "${s}/bin/cp-${name}";
}