Program Listing for File chrono_utils.hpp

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#pragma once
#ifndef UITSL_CHRONO_CHRONO_UTILS_HPP_INCLUDE
#define UITSL_CHRONO_CHRONO_UTILS_HPP_INCLUDE

#include <chrono>
#include <iomanip>
#include <limits>

namespace uitsl {

inline std::chrono::duration<double> infinite_duration {
  std::numeric_limits<double>::infinity()
};

inline std::chrono::duration<int> zero_duration { 0 };

// adapted from https://stackoverflow.com/a/46134506
inline std::string beautify_duration(std::chrono::seconds input_seconds) {
    using namespace std::chrono;
    typedef duration<int, std::ratio<86400>> days;
    auto d = duration_cast<days>(input_seconds);
    input_seconds -= d;
    auto h = duration_cast<hours>(input_seconds);
    input_seconds -= h;
    auto m = duration_cast<minutes>(input_seconds);
    input_seconds -= m;
    auto s = duration_cast<seconds>(input_seconds);

    auto dc = d.count();
    auto hc = h.count();
    auto mc = m.count();
    auto sc = s.count();

    std::stringstream ss;
    ss.fill('0');
    if (dc) {
        ss << d.count() << "d:";
    }
    if (dc || hc) {
        if (dc) { ss << std::setw(2); } //pad if second set of numbers
        ss << h.count() << "h:";
    }
    if (dc || hc || mc) {
        if (dc || hc) { ss << std::setw(2); }
        ss << m.count() << "m:";
    }
    if (dc || hc || mc || sc) {
        if (dc || hc || mc) { ss << std::setw(2); }
        ss << s.count() << 's';
    }

    return ss.str();
}

} // namespace uitsl

#endif // #ifndef UITSL_CHRONO_CHRONO_UTILS_HPP_INCLUDE