snippet.nix

{ config, lib, pkgs, ... }:

with lib;

let
  fromOctalStr = value:
    let
      toOctalDigit = d:
        {
          "0" = 0;
          "1" = 1;
          "2" = 2;
          "3" = 3;
          "4" = 4;
          "5" = 5;
          "6" = 6;
          "7" = 7;
        }.${d};
      octalMul = x: y: x * 8 + (toOctalDigit y);
    in builtins.foldl' octalMul 0 (stringToCharacters value);

  toSocket = name: value:
    if value == null
    then null
    else if name == "SockPathMode"
    then fromOctalStr value
    else value;

  toSockets = name: value:
    if value == null
    then null
    else mapAttrs toSocket value;

  toUserAgent = name: value:
    if value == null
    then null
    else if name == "Umask"
    then fromOctalStr value
    else if name == "Sockets"
    then mapAttrs toSockets value
    else value;