nixpkgs/lib/kernel.nix

{ lib, version }:

with lib;
rec {
  # Common patterns/legacy
  whenAtLeast = ver: mkIf (versionAtLeast version ver);
  whenOlder   = ver: mkIf (versionOlder version ver);
  # range is (inclusive, exclusive)
  whenBetween = verLow: verHigh: mkIf (versionAtLeast version verLow && versionOlder version verHigh);


  # Keeping these around in case we decide to change this horrible implementation :)
  option = x:
      x // { optional = true; };

  yes      = { tristate    = "y"; };
  no       = { tristate    = "n"; };
  module   = { tristate    = "m"; };
  freeform = x: { freeform = x; };

}