forked from lix-project/lix
ad410abbe0
It has been there for a few releases now (landed in 2.14.0), doesn't seem to cause any major issue and is wanted in a few places (https://github.com/NixOS/nix/pull/7087#issuecomment-1544471346).
103 lines
2.4 KiB
C++
103 lines
2.4 KiB
C++
#pragma once
|
||
///@file
|
||
|
||
#include "comparator.hh"
|
||
#include "error.hh"
|
||
#include "json-utils.hh"
|
||
#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 and documentation in the corresponding
|
||
* `.cc` file as well.
|
||
*/
|
||
enum struct ExperimentalFeature
|
||
{
|
||
CaDerivations,
|
||
ImpureDerivations,
|
||
Flakes,
|
||
NixCommand,
|
||
RecursiveNix,
|
||
NoUrlLiterals,
|
||
FetchClosure,
|
||
ReplFlake,
|
||
AutoAllocateUids,
|
||
Cgroups,
|
||
DaemonTrustOverride,
|
||
DynamicDerivations,
|
||
ParseTomlTimestamps,
|
||
ReadOnlyLocalStore,
|
||
};
|
||
|
||
/**
|
||
* Just because writing `ExperimentalFeature::CaDerivations` is way too long
|
||
*/
|
||
using Xp = ExperimentalFeature;
|
||
|
||
/**
|
||
* Parse an experimental feature (enum value) from its name. Experimental
|
||
* feature flag names are hyphenated and do not contain spaces.
|
||
*/
|
||
const std::optional<ExperimentalFeature> parseExperimentalFeature(
|
||
const std::string_view & name);
|
||
|
||
/**
|
||
* Show the name of an experimental feature. This is the opposite of
|
||
* parseExperimentalFeature().
|
||
*/
|
||
std::string_view showExperimentalFeature(const ExperimentalFeature);
|
||
|
||
/**
|
||
* Compute the documentation of all experimental features.
|
||
*
|
||
* See `doc/manual` for how this information is used.
|
||
*/
|
||
nlohmann::json documentExperimentalFeatures();
|
||
|
||
/**
|
||
* Shorthand for `str << showExperimentalFeature(feature)`.
|
||
*/
|
||
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 unknown feature.
|
||
*/
|
||
std::set<ExperimentalFeature> parseFeatures(const std::set<std::string> &);
|
||
|
||
/**
|
||
* An experimental feature was required for some (experimental)
|
||
* operation, but was not enabled.
|
||
*/
|
||
class MissingExperimentalFeature : public Error
|
||
{
|
||
public:
|
||
/**
|
||
* The experimental feature that was required but not enabled.
|
||
*/
|
||
ExperimentalFeature missingFeature;
|
||
|
||
MissingExperimentalFeature(ExperimentalFeature missingFeature);
|
||
};
|
||
|
||
/**
|
||
* 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 &);
|
||
|
||
/**
|
||
* It is always rendered as a string
|
||
*/
|
||
template<>
|
||
struct json_avoids_null<ExperimentalFeature> : std::true_type {};
|
||
|
||
}
|