source: branches/0.6-stable/lib/Date.cc @ 685

// $Id: Date.cc 685 2008-08-04 14:53:58Z peter $

/*
  Copyright (C) 2007 Peter Johansson
  Copyright (C) 2008 Jari Häkkinen

  This file is part of svndigest, http://dev.thep.lu.se/svndigest

  svndigest 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 2 of the License, or
  (at your option) any later version.

  svndigest 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., 59 Temple Place - Suite 330, Boston, MA
  02111-1307, USA.
*/

#include "Date.h"

#include <algorithm>
#include <sstream>
#include <string>

namespace theplu {
namespace svndigest {

  static const char* wdays_[7] = {
    "Sunday","Monday", "Tuesday", "Wednesday", "Thursday", "Friday", 
    "Saturday" 
  };

    
  static const char* month_[12] = {
    "January", "February", "March", "April", "May", "June", "July", "August", 
    "September", "October", "November", "December"
  }; 


  Date::Date(void)
  {
    std::time(&time_);
  }


  Date::Date(const Date& other)
    : time_(other.time_)
  {
  }


  Date::Date(std::string str)
  {
    std::time(&time_);
    svntime(str);
  }


  std::string Date::difftime(const Date& other) const
  {
    std::stringstream ss;
    time_t t0 = std::min(seconds(), other.seconds());
    time_t t1 = std::max(seconds(), other.seconds());
    struct tm* last = std::gmtime(&t1);

    unsigned int year=0;
    while (t0<=t1) {
      ++year;
      --last->tm_year;
      t1=mktime(last);
    }
    --year;
    ++last->tm_year;
    t1=mktime(last);
    if (year) {
      ss << year << " year";
      if (year>1)
        ss << "s";
      ss << " ";
    }

    unsigned int month=0;
    while (t0<=t1) {
      ++month;
      --last->tm_mon;
      t1=mktime(last);
    }
    --month;
    ++last->tm_mon;
    t1=mktime(last);
    if (month || year) {
      ss << month << " month";
      if (month>1 || (year && !month))
        ss << "s";
      ss << " and ";
    }
    

    unsigned int day = (t1-t0)/24/60/60;
    ss << day << " day";
    if (day!=1)
      ss << "s";
    ss << " ";

    return ss.str();
  }


  void Date::svntime(std::string str)
  {
    std::stringstream sstream(str);
    struct tm* timeinfo = std::localtime(&time_);

    unsigned int year, month, day, hour, minute, second;
    std::string tmp;
    std::getline(sstream,tmp,'-');
    year=atoi(tmp.c_str());
    timeinfo->tm_year = year - 1900;

    std::getline(sstream,tmp,'-');
    month=atoi(tmp.c_str());
    timeinfo->tm_mon = month - 1;

    std::getline(sstream,tmp,'T');
    day=atoi(tmp.c_str());
    timeinfo->tm_mday = day;

    std::getline(sstream,tmp,':');
    hour=atoi(tmp.c_str());
    timeinfo->tm_hour = hour;

    std::getline(sstream,tmp,':');
    minute=atoi(tmp.c_str());
    timeinfo->tm_min = minute;

    std::getline(sstream,tmp,'.');
    second=atoi(tmp.c_str());
    timeinfo->tm_sec = second;

    time_ = mktime(timeinfo);
    time_ += timeinfo->tm_gmtoff;
  }


  std::string Date::operator()(std::string format) const
  {
    std::stringstream ss;
    struct tm* timeinfo = std::gmtime(&time_);
    for (std::string::iterator i=format.begin(); i!=format.end(); ++i) {
      if (*i == '%' && ++i !=format.end()) {
        if (*i == 'a')
          ss << std::string(wdays_[timeinfo->tm_wday]).substr(0,3);
        else if (*i == 'A')
          ss << wdays_[timeinfo->tm_wday];
        else if (*i == 'b')
          ss << std::string(month_[timeinfo->tm_mon]).substr(0,3);
        else if (*i == 'B')
          ss << month_[timeinfo->tm_mon];
        else if (*i == 'd')
          ss << timeinfo->tm_mday;
        else if (*i == 'e') {
          if (timeinfo->tm_mday<10)
            ss << "0";
          ss << timeinfo->tm_mday;
        }
        else if (*i == 'H') {
          if (timeinfo->tm_hour<10)
            ss << "0";
          ss << timeinfo->tm_hour;
        }
        else if (*i == 'I') {
          int tmp = (timeinfo->tm_hour + 11) % 12 + 1;
          if (tmp<10)
            ss << "0";
          ss << tmp;
        }
        else if (*i == 'j')
          ss << timeinfo->tm_yday+1;
        else if (*i == 'm') {
          if (timeinfo->tm_mon<9)
            ss << "0";
          ss << timeinfo->tm_mon+1;
        }
        else if (*i == 'M') {
          if (timeinfo->tm_min<10)
            ss << "0";
          ss << timeinfo->tm_min;
        }
        else if (*i == 'P')
          if (timeinfo->tm_hour<12)
            ss << "AM";
          else
            ss << "PM";
        else if (*i == 'S') {
          if (timeinfo->tm_sec<10)
            ss << "0";
          ss << timeinfo->tm_sec;
        }
        else if (*i == 'w')
          if (timeinfo->tm_wday==0)
            ss << "7";
          else
            ss << timeinfo->tm_wday;
        else if (*i == 'y') {
          int y(timeinfo->tm_year % 100);
          if (y<10)
            ss << "0";
          ss << y;
        }
        else if (*i == 'Y')
          ss << timeinfo->tm_year+1900;
        else if (*i == 'Z')
          ss << timeinfo->tm_zone;
        else {
          ss << '%';
          --i;
        }
      }
      else
        ss << *i;
    }

    return ss.str();
  }


  const Date& Date::operator=(const Date& rhs) 
  {
    time_ = rhs.time_;
    return *this;
  }


}}