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c++20. clock chrono API. STL + format

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Signed-off-by: Viktar Lukashonak <myxabeer@gmail.com>
This commit is contained in:
Viktar Lukashonak
2023-11-10 17:57:26 +03:00
parent c4330a1e36
commit 86a38980e4
8 changed files with 379 additions and 374 deletions
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65
include/util/date.hpp
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@ -1,34 +1,52 @@
#pragma once
#include <fmt/format.h>
#include <chrono>
#if HAVE_CHRONO_TIMEZONES
#include <chrono>
#include <format>
/* Compatibility layer for <date/tz.h> on top of C++20 <chrono> */
namespace date {
using namespace std::chrono;
namespace literals {
using std::chrono::last;
}
inline auto format(const std::string& spec, const auto& ztime) {
return spec.empty() ? "" : std::vformat("{:L" + spec + "}", std::make_format_args(ztime));
}
inline auto format(const std::locale& loc, const std::string& spec, const auto& ztime) {
return spec.empty() ? "" : std::vformat(loc, "{:L" + spec + "}", std::make_format_args(ztime));
}
} // namespace date
#else
#include <date/tz.h>
#include <fmt/format.h>
#include <regex>
#endif
// Date
namespace date {
#if HAVE_CHRONO_TIMEZONES
using namespace std::chrono;
using namespace std;
#else
using system_clock = std::chrono::system_clock;
using seconds = std::chrono::seconds;
template <typename T>
inline auto format(const char* spec, const T& arg) {
return date::format(std::regex_replace(spec, std::regex("\\{:L|\\}"), ""), arg);
}
template <typename T>
inline auto format(const std::locale& loc, const char* spec, const T& arg) {
return date::format(loc, std::regex_replace(spec, std::regex("\\{:L|\\}"), ""), arg);
}
constexpr decltype(auto) operator""d(unsigned long long d) noexcept {
return date::operator""_d(d); // very verbose, but it works
}
#endif
} // namespace date
// Format
namespace waybar::util::date::format {
#if HAVE_CHRONO_TIMEZONES
using namespace std;
#else
using namespace fmt;
#endif
} // namespace waybar::util::date::format
#if not HAVE_CHRONO_TIMEZONES
template <typename Duration, typename TimeZonePtr>
struct fmt::formatter<date::zoned_time<Duration, TimeZonePtr>> {
std::string_view specs;
@ -58,3 +76,6 @@ struct fmt::formatter<date::zoned_time<Duration, TimeZonePtr>> {
return fmt::format_to(ctx.out(), "{}", date::format(fmt::to_string(specs), ztime));
}
};
#endif
using namespace date;