tvl-depot/third_party/nix/tests/plugins/plugintest.cc

#include "libutil/config.hh"
#include "primops.hh"

using namespace nix;

struct MySettings : Config {
  Setting<bool> settingSet{this, false, "setting-set",
                           "Whether the plugin-defined setting was set"};
};

MySettings mySettings;

static GlobalConfig::Register rs(&mySettings);

static void prim_anotherNull(EvalState& state, const Pos& pos, Value** args,
                             Value& v) {
  if (mySettings.settingSet)
    mkNull(v);
  else
    mkBool(v, false);
}

static RegisterPrimOp rp("anotherNull", 0, prim_anotherNull);