{lib, machineDir, ... }:
let

  allMachineNames =
    let
      #machineDir = "${config.clanCore.clanDir}/machines/";
      #machineDir = ../../machines;
      machines = lib.mapAttrsToList (name: _: name) (builtins.readDir machineDir);
    in
    machines;

  getFactPath = fact: machine:
    "${machineDir}/${machine}/facts/${fact}";

  readFact = fact: machine:
    let
      path = getFactPath fact machine;
    in
    if builtins.pathExists path then
      builtins.readFile path
    else
      null;

  readFactFromAllMachines = fact:
    let
      machines = allMachineNames;
      facts = lib.genAttrs machines (readFact fact);
      filteredFacts = lib.filterAttrs (_machine: fact: fact != null) facts;
    in
    filteredFacts;

in
{ inherit allMachineNames getFactPath readFact readFactFromAllMachines; }