Refactoring louloulibs and cmake

Use OBJECT libraries
Remove the louloulibs directory
Write FOUND variables in the cache

src/config/config.hpp

@@ -0,0 +1,93 @@
+/**
+ * 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 then 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.
+ */
+
+#pragma once
+
+#include <functional>
+#include <fstream>
+#include <memory>
+#include <vector>
+#include <string>
+#include <map>
+
+typedef std::function<void()> t_config_changed_callback;
+
+class Config
+{
+public:
+  Config() = default;
+  ~Config() = default;
+  Config(const Config&) = delete;
+  Config& operator=(const Config&) = delete;
+  Config(Config&&) = delete;
+  Config& operator=(Config&&) = delete;
+
+  /**
+   * returns a value from the config. If it doesn’t exist, use
+   * the second argument as the default.
+   */
+  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.
+   */
+  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 save is true.
+   */
+  static void set(const std::string&, const std::string&, bool save = false);
+  /**
+   * Adds a function to a list. This function will be called whenever a
+   * configuration change occurs (when set() is called, or when the initial
+   * conf is read)
+   */
+  static void connect(t_config_changed_callback);
+  /**
+   * Destroy the instance, forcing it to be recreated (with potentially
+   * different parameters) the next time it’s needed.
+   */
+  static void clear();
+  /**
+   * Read the configuration file at the given path.
+   */
+  static bool read_conf(const std::string& name="");
+  /**
+   * Get the filename
+   */
+  static const std::string& get_filename()
+  { return Config::filename; }
+
+private:
+  /**
+   * Set the value of the filename to use, before calling any method.
+   */
+  static std::string filename;
+  /**
+   * Write all the config values into the configuration file
+   */
+  static void save_to_file();
+  /**
+   * Call all the callbacks previously registered using connect().
+   * This is used to notify any class that a configuration change occured.
+   */
+  static void trigger_configuration_change();
+
+  static std::map<std::string, std::string> values;
+  static std::vector<t_config_changed_callback> callbacks;
+
+};
+
+