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+/**
+ * Read the config file and save all the values in a map.
+ * Also, a singleton.
+ *
+ * Use Config::filename = "bla" to set the filename you want to use.
+ *
+ * If you want to exit if the file does not exist when it is open for
+ * reading, set Config::file_must_exist = true.
+ *
+ * Config::get() can the be used to access the values in the conf.
+ *
+ * Use Config::close() when you're done getting/setting value. This will
+ * save the config into the file.
+ */
+
+#ifndef CONFIG_INCLUDED
+# define CONFIG_INCLUDED
+
+#include <functional>
+#include <fstream>
+#include <memory>
+#include <vector>
+#include <string>
+#include <map>
+
+typedef std::function<void()> t_config_changed_callback;
+
+class Config
+{
+public:
+ Config(){};
+ ~Config(){};
+ /**
+ * returns a value from the config. If it doesn’t exist, use
+ * the second argument as the default.
+ * @param option The option we want
+ * @param def The default value in case the option does not exist
+ */
+ static std::string get(const std::string&, const std::string&);
+ /**
+ * returns a value from the config. If it doesn’t exist, use
+ * the second argument as the default.
+ * @param option The option we want
+ * @param def The default value in case the option does not exist
+ */
+ static int get_int(const std::string&, const int&);
+ /**
+ * Set a value for the given option. And write all the config
+ * in the file from which it was read if boolean is set.
+ * @param option The option to set
+ * @param value The value to use
+ * @param save if true, save the config file
+ */
+ static void set(const std::string&, const std::string&, bool save = false);
+ /**
+ * Set a value for the given option. And write all the config
+ * in the file from which it was read if boolean is set.
+ * @param option The option to set
+ * @param value The value to use
+ * @param save if true, save the config file
+ */
+ static void set_int(const std::string&, const int&, bool save = false);
+ /**
+ * Adds a function to a list. This function will be called whenever a
+ * configuration change occurs.
+ */
+ static void connect(t_config_changed_callback);
+ /**
+ * Close the config file, saving it to the file is save == true.
+ */
+ static void close();
+
+ /**
+ * Set the value of the filename to use, before calling any method.
+ */
+ static std::string filename;
+ /**
+ * Set to true if you want an exception to be raised if the file does not
+ * exist when reading it.
+ */
+ static bool file_must_exist;
+
+private:
+ /**
+ * Get the singleton instance
+ */
+ static std::unique_ptr<Config>& instance();
+ /**
+ * Read the configuration file at the given path.
+ */
+ bool read_conf();
+ /**
+ * Write all the config values into the configuration file
+ */
+ void save_to_file() const;
+ /**
+ * Call all the callbacks previously registered using connect().
+ * This is used to notify any class that a configuration change occured.
+ */
+ void trigger_configuration_change();
+
+ std::map<std::string, std::string> values;
+ std::vector<t_config_changed_callback> callbacks;
+
+ Config(const Config&) = delete;
+ Config& operator=(const Config&) = delete;
+ Config(Config&&) = delete;
+ Config& operator=(Config&&) = delete;
+};
+
+#endif // CONFIG_INCLUDED