#include "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);