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#pragma once
///@file
#include "comparator.hh"
#include "error.hh"
#include "nlohmann/json_fwd.hpp"
#include "types.hh"
namespace nix {
/**
* The list of available experimental features.
*
* If you update this, don’t forget to also change the map defining their
* string representation in the corresponding `.cc` file.
*/
enum struct ExperimentalFeature
{
CaDerivations,
ImpureDerivations,
Flakes,
NixCommand,
RecursiveNix,
NoUrlLiterals,
FetchClosure,
ReplFlake,
AutoAllocateUids,
Cgroups,
DiscardReferences,
/**
* A "permanent" experimental feature for extra features we just
* need for testing.
**/
NixTesting,
};
/**
* Just because writing `ExperimentalFeature::CaDerivations` is way too long
*/
using Xp = ExperimentalFeature;
const std::optional<ExperimentalFeature> parseExperimentalFeature(
const std::string_view & name);
std::string_view showExperimentalFeature(const ExperimentalFeature);
std::ostream & operator<<(
std::ostream & str,
const ExperimentalFeature & feature);
/**
* Parse a set of strings to the corresponding set of experimental features,
* ignoring (but warning for) any unkwown feature.
*/
std::set<ExperimentalFeature> parseFeatures(const std::set<std::string> &);
class MissingExperimentalFeature : public Error
{
public:
ExperimentalFeature missingFeature;
MissingExperimentalFeature(ExperimentalFeature);
};
/**
* Semi-magic conversion to and from json.
* See the nlohmann/json readme for more details.
*/
void to_json(nlohmann::json &, const ExperimentalFeature &);
void from_json(const nlohmann::json &, ExperimentalFeature &);
}
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