nix-super/tests/plugins/plugintest.cc

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#include "config.hh"
#include "primops.hh"
using namespace nix;
struct MySettings : Config
{
Setting<bool> settingSet{this, false, "setting-set",
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"Whether the plugin-defined setting was set"};
};
MySettings mySettings;
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static GlobalConfig::Register rs(&mySettings);
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static void prim_anotherNull (EvalState & state, const PosIdx pos, Value ** args, Value & v)
{
if (mySettings.settingSet)
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v.mkNull();
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else
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v.mkBool(false);
}
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static RegisterPrimOp rp("anotherNull", 0, prim_anotherNull);