Line data    Source code

       1             : /*
       2             :  * License:
       3             :  *    Copyright (c) 2006-2019  Made to Order Software Corp.  All Rights Reserved
       4             :  *
       5             :  *    https://snapwebsites.org/
       6             :  *    contact@m2osw.com
       7             :  *
       8             :  *    This program is free software; you can redistribute it and/or modify
       9             :  *    it under the terms of the GNU General Public License as published by
      10             :  *    the Free Software Foundation; either version 2 of the License, or
      11             :  *    (at your option) any later version.
      12             :  *
      13             :  *    This program is distributed in the hope that it will be useful,
      14             :  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      16             :  *    GNU General Public License for more details.
      17             :  *
      18             :  *    You should have received a copy of the GNU General Public License along
      19             :  *    with this program; if not, write to the Free Software Foundation, Inc.,
      20             :  *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
      21             :  *
      22             :  * Authors:
      23             :  *    Alexis Wilke   alexis@m2osw.com
      24             :  *    Doug Barbieri  doug@m2osw.com
      25             :  */
      26             : #pragma once
      27             : 
      28             : /** \file
      29             :  * \brief Declaration of the log class used to send error messages.
      30             :  *
      31             :  * The library offers a log facility for when messages are generated on
      32             :  * errors and various output (i.e. --help).
      33             :  */
      34             : 
      35             : // C++ lib
      36             : //
      37             : #include    <iostream>
      38             : #include    <sstream>
      39             : 
      40             : 
      41             : namespace advgetopt
      42             : {
      43             : 
      44             : 
      45             : enum class log_level_t
      46             : {
      47             :     debug,
      48             :     info,
      49             :     warning,
      50             :     error,
      51             :     fatal
      52             : };
      53             : 
      54             : std::string to_string(log_level_t level);
      55             : 
      56             : 
      57             : typedef void (*log_callback)(log_level_t level, std::string const & message);
      58             : 
      59             : void set_log_callback(log_callback callback);
      60             : 
      61             : 
      62           4 : class logger
      63             : {
      64             : public:
      65             :     template<typename T>
      66        1253 :     logger & operator << (T const & v)
      67             :     {
      68        1253 :         f_log << v;
      69        1253 :         return *this;
      70             :     }
      71             : 
      72         221 :     logger & operator << (log_level_t const & level)
      73             :     {
      74         221 :         f_level = level;
      75         221 :         return *this;
      76             :     }
      77             : 
      78         221 :     logger & operator << (logger & (*func)(logger &))
      79             :     {
      80         221 :         func(*this);
      81         221 :         return *this;
      82             :     }
      83             : 
      84             :     logger &            end();
      85             : 
      86             : private:
      87             :     log_level_t         f_level = log_level_t::error;
      88             :     std::stringstream   f_log = std::stringstream();
      89             : };
      90             : 
      91             : 
      92         221 : inline logger & end(logger & l) { return l.end(); }
      93             : 
      94             : 
      95             : extern logger   log;
      96             : 
      97             : 
      98             : }   // namespace advgetopt
      99             : // vim: ts=4 sw=4 et