{ lib, pkgs }:
with lib; let
  self = {
    importYAML = path:
      importJSON (pkgs.runCommand "yaml-to-json" { } ''
        ${pkgs.yq}/bin/yq -c . ${path} > $out
      '');

    toYAML = config:
      builtins.readFile (pkgs.runCommand "to-yaml" { } ''
        ${pkgs.yq}/bin/yq -y . ${pkgs.writeText "to-json" (builtins.toJSON config)}  > $out
      '');

    toMultiDocumentYaml = name: documents:
      pkgs.runCommand name { }
        (concatMapStringsSep "\necho --- >> $out\n"
          (
            d: "${pkgs.yq}/bin/yq -y . ${pkgs.writeText "to-json" (builtins.toJSON d)} >> $out"
          )
          documents);

    toBase64 = value:
      builtins.readFile
        (pkgs.runCommand "value-to-b64" { } "echo -n '${value}' | ${pkgs.coreutils}/bin/base64 -w0 > $out");

    exp = base: exp: foldr (_value: acc: acc * base) 1 (range 1 exp);

    octalToDecimal = value:
      (foldr
        (char: acc: {
          i = acc.i + 1;
          value = acc.value + (toInt char) * (self.exp 8 acc.i);
        })
        {
          i = 0;
          value = 0;
        }
        (stringToCharacters value)).value;
  };
in
self