~singpolyma/biboumi

ref: 550ab46f02511614d7ce7b46a4b4f63beae1aebc biboumi/louloulibs/config/config.cpp -rw-r--r-- 2.5 KiB
550ab46f — louiz’ Make the logger tests more useful 6 years ago
                                                                                
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
#include <config/config.hpp>

#include <iostream>
#include <sstream>

#include <stdlib.h>

std::string Config::filename{};
bool Config::file_must_exist = false;

std::string Config::get(const std::string& option, const std::string& def)
{
  Config* self = Config::instance().get();
  auto it = self->values.find(option);

  if (it == self->values.end())
    return def;
  return it->second;
}

int Config::get_int(const std::string& option, const int& def)
{
  Config* self = Config::instance().get();
  std::string res = self->get(option, "");
  if (!res.empty())
    return atoi(res.c_str());
  else
    return def;
}

void Config::set(const std::string& option, const std::string& value, bool save)
{
  Config* self = Config::instance().get();
  self->values[option] = value;
  if (save)
    {
      self->save_to_file();
      self->trigger_configuration_change();
    }
}

void Config::connect(t_config_changed_callback callback)
{
  Config* self = Config::instance().get();
  self->callbacks.push_back(callback);
}

void Config::close()
{
  Config* self = Config::instance().get();
  self->values.clear();
  Config::instance().reset();
}

/**
 * Private methods
 */

void Config::trigger_configuration_change()
{
  std::vector<t_config_changed_callback>::iterator it;
  for (it = this->callbacks.begin(); it < this->callbacks.end(); ++it)
      (*it)();
}

std::unique_ptr<Config>& Config::instance()
{
  static std::unique_ptr<Config> instance;

  if (!instance)
    {
      instance = std::make_unique<Config>();
      instance->read_conf();
    }
  return instance;
}

bool Config::read_conf()
{
  std::ifstream file;
  file.open(filename.data());
  if (!file.is_open())
    {
      if (Config::file_must_exist)
        {
          perror(("Error while opening file " + filename + " for reading.").c_str());
          file.exceptions(std::ifstream::failbit);
        }
      return false;
    }

  std::string line;
  size_t pos;
  std::string option;
  std::string value;
  while (file.good())
    {
      std::getline(file, line);
      if (line == "" || line[0] == '#')
        continue ;
      pos = line.find('=');
      if (pos == std::string::npos)
        continue ;
      option = line.substr(0, pos);
      value = line.substr(pos+1);
      this->values[option] = value;
    }
  return true;
}

void Config::save_to_file() const
{
  std::ofstream file(this->filename.data());
  if (file.fail())
    {
      std::cerr << "Could not save config file." << std::endl;
      return ;
    }
  for (auto& it: this->values)
    file << it.first << "=" << it.second << '\n';
  file.close();
}