relative_time_formatter.hpp

/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * Copyright (C) 2025 Marco Craveiro <marco.craveiro@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 3 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */
#ifndef ORES_UTILITY_DATETIME_RELATIVE_TIME_FORMATTER_HPP
#define ORES_UTILITY_DATETIME_RELATIVE_TIME_FORMATTER_HPP
 
#include <chrono>
#include <string>
 
namespace ores::utility::datetime {
 
enum class numeric_style {
    always,
 
    automatic
};
 
enum class time_unit {
    second,
    minute,
    hour,
    day,
    week,
    month,
    quarter,
    year
};
 
class relative_time_formatter final {
public:
    explicit relative_time_formatter(numeric_style style = numeric_style::automatic);
 
    std::string format(const std::chrono::system_clock::time_point& tp) const;
 
    std::string format(
        const std::chrono::system_clock::time_point& tp,
        const std::chrono::system_clock::time_point& reference) const;
 
    std::string format(long long value, time_unit unit) const;
 
private:
    numeric_style style_;
};
 
}
 
#endif