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#include "json-helper.hpp"
#include "compat/assert.hpp"
#include <cerrno>
#include <cstring>
#include <fstream>
namespace floormat {
template<typename T, std::ios_base::openmode mode>
static T open_stream(StringView filename)
{
T s;
s.open(filename.data(), mode);
if (!s)
{
char errbuf[128];
constexpr auto get_error_string = []<std::size_t N> (char (&buf)[N])
{
buf[0] = '\0';
#ifndef _WIN32
(void)::strerror_r(errno, buf, std::size(buf));
#else
(void)::strerror_s(buf, std::size(buf), errno);
#endif
};
const char* mode_str = (mode & std::ios_base::out) == std::ios_base::out ? "writing" : "reading";
(void)get_error_string(errbuf);
fm_error("can't open file '%s' for %s: %s", filename.data(), mode_str, errbuf);
}
return s;
}
auto json_helper::from_json_(StringView filename) -> json
{
json j;
open_stream<std::ifstream, std::ios_base::in>(filename) >> j;
return j;
}
void json_helper::to_json_(const json& j, StringView filename, int indent)
{
(open_stream<std::ofstream, std::ios_base::out>(filename) << j.dump(indent, '\t') << '\n').flush();
}
} // namespace floormat
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