let
  inherit (builtins)
    elemAt
    mapAttrs
    match
    readDir
    readFile
    ;
  removeTrailingWhitespace = s: elemAt (match "(.*[^[:space:]])[[:space:]]*" s) 0;
  collectKeys =
    dir: mapAttrs (name: _: removeTrailingWhitespace (readFile (dir + "/${name}"))) (readDir dir);
in
{
  contributors = collectKeys ./contributors;
  systems = collectKeys ./systems;
}