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#pragma once
#include <tuple>
#include <fstream>
#include <exception>
#include <filesystem>
#include <nlohmann/json.hpp>
#include <Corrade/Utility/DebugStl.h>
struct json_helper final {
template<typename t>
[[nodiscard]]
static std::tuple<t, bool> from_json(const std::filesystem::path& pathname);
template<typename t>
[[nodiscard]]
static bool to_json(const t& self, const std::filesystem::path& pathname);
};
template<typename t>
std::tuple<t, bool> json_helper::from_json(const std::filesystem::path& pathname) {
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{} << "failed to open" << pathname << "for reading:" << e.what();
return {};
}
t ret;
nlohmann::json j;
s >> j;
ret = j;
return { std::move(ret), true };
}
template<typename t>
bool json_helper::to_json(const t& self, const std::filesystem::path& pathname) {
using Corrade::Utility::Error;
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{} << "failed to open" << pathname << "for writing:" << e.what();
return false;
}
s << j.dump(4);
s << '\n';
s.flush();
return true;
}
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