timestamp.hpp

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// Copyright (c) 2017-2018 Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
// Copyright (c) 2017-2018 Centre national de la recherche scientifique (CNRS)
// Copyright (c) 2018 Simons Foundation
// Copyright (c) 2017 Hugo U.R. Strand
//
// 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 may obtain a copy of the License at
//     https://www.gnu.org/licenses/gpl-3.0.txt
//
// Authors: Hugo U. R. Strand, Nils Wentzell

 
#pragma once
 
#include "./timer.hpp"
 
#include <chrono>
#include <ctime>
#include <iomanip>
#include <sstream>
#include <string>
 
namespace triqs::utility {


  std::string inline timestamp() {
    std::ostringstream s;
    auto now          = std::chrono::system_clock::now();
    std::time_t now_c = std::chrono::system_clock::to_time_t(now);
    s << std::put_time(std::localtime(&now_c), "%H:%M:%S");
    return s.str();
  }

  std::string inline hours_minutes_seconds_from_seconds(double sec) {
    auto s = std::chrono::seconds{int(sec)};
    auto h = std::chrono::duration_cast<std::chrono::hours>(s);
    auto m = std::chrono::duration_cast<std::chrono::minutes>(s -= h);
    s -= m;
    std::ostringstream os;
    os << std::setfill('0') << std::setw(2) << h.count() << ":" << std::setfill('0') << std::setw(2) << m.count() << ":" << std::setfill('0')
       << std::setw(2) << s.count();
    return os.str();
  }

  std::string inline estimate_time_left(int N, int n, timer &t) {
    double eta = (N - 1 - n) * double(t) / (n + 1);
    return hours_minutes_seconds_from_seconds(eta);
  }

 
} // namespace triqs::utility