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#pragma once
#include "types.hh"
#include "hash.hh"
#include "fetchers.hh"
#include <variant>
namespace nix {
class Store;
typedef std::string FlakeId;
// The FlakeRef represents a local nix store reference to a flake
// input for a Flake (it may be helpful to think of this object by the
// alternate name of "InputRefForFlake"). It is constructed by
// starting with an input description (usually the attrs or a url from
// the flake file), locating a fetcher for that input, and then
// capturing the Input object that fetcher generates (usually via
// FlakeRef::fromAttrs(attrs) or parseFlakeRef(url) calls).
//
// The actual fetch not have been performed yet (i.e. a FlakeRef may
// be lazy), but the fetcher can be invoked at any time via the
// FlakeRef to ensure the store is populated with this input.
struct FlakeRef
{
// fetcher-specific representation of the input, sufficient to
// perform the fetch operation.
fetchers::Input input;
// sub-path within the fetched input that represents this input
Path subdir;
bool operator==(const FlakeRef & other) const;
FlakeRef(fetchers::Input && input, const Path & subdir)
: input(std::move(input)), subdir(subdir)
{ }
// FIXME: change to operator <<.
std::string to_string() const;
fetchers::Attrs toAttrs() const;
FlakeRef resolve(ref<Store> store) const;
static FlakeRef fromAttrs(const fetchers::Attrs & attrs);
std::pair<fetchers::Tree, FlakeRef> fetchTree(ref<Store> store) const;
};
std::ostream & operator << (std::ostream & str, const FlakeRef & flakeRef);
FlakeRef parseFlakeRef(
const std::string & url, const std::optional<Path> & baseDir = {}, bool allowMissing = false);
std::optional<FlakeRef> maybeParseFlake(
const std::string & url, const std::optional<Path> & baseDir = {});
std::pair<FlakeRef, std::string> parseFlakeRefWithFragment(
const std::string & url, const std::optional<Path> & baseDir = {}, bool allowMissing = false);
std::optional<std::pair<FlakeRef, std::string>> maybeParseFlakeRefWithFragment(
const std::string & url, const std::optional<Path> & baseDir = {});
}
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