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#pragma once
#include <tuple>
#include <fstream>
#include <exception>
#include <filesystem>
#include <nlohmann/json.hpp>
#include <Corrade/Utility/DebugStl.h>
template<typename t>
struct json_helper final {
[[nodiscard]] static std::tuple<t, bool> from_json(const std::filesystem::path& pathname) noexcept;
[[nodiscard]] static bool to_json(const t& self, const std::filesystem::path& pathname) noexcept;
};
template<typename t>
std::tuple<t, bool> json_helper<t>::from_json(const std::filesystem::path& pathname) noexcept {
using namespace nlohmann;
using Corrade::Utility::Error;
std::ifstream s;
s.exceptions(s.exceptions() | std::ios::failbit | std::ios::badbit);
try {
s.open(pathname, std::ios_base::in);
} catch (const std::ios::failure& e) {
Error{Error::Flag::NoSpace} << "failed to open '" << pathname << "': " << e.what();
return { {}, false };
}
t ret;
try {
json j;
s >> j;
using nlohmann::from_json;
from_json(j, ret);
} catch (const std::exception& e) {
Error{Error::Flag::NoSpace} << "failed to parse '" << pathname << "': " << e.what();
return { {}, false };
}
return { std::move(ret), true };
}
template<typename t>
bool json_helper<t>::to_json(const t& self, const std::filesystem::path& pathname) noexcept {
using Corrade::Utility::Error;
try {
nlohmann::json j = self;
std::ofstream s;
s.exceptions(s.exceptions() | std::ios::failbit | std::ios::badbit);
try {
s.open(pathname, std::ios_base::out | std::ios_base::trunc);
} catch (const std::ios::failure& e) {
Error{Error::Flag::NoSpace} << "failed to open '" << pathname << "' for writing: " << e.what();
return false;
}
s << j.dump(4);
s.flush();
} catch (const std::exception& e) {
Error{Error::Flag::NoSpace} << "failed writing to '" << pathname << "': " << e.what();
return false;
}
return true;
}
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