From f0d9273da61ce154dbe460cf58c98de851d30615 Mon Sep 17 00:00:00 2001
From: Florent Le Coz <louiz@louiz.org>
Date: Sun, 10 Nov 2013 20:47:11 +0100
Subject: Add a Config module, and use it to get the password from a file

---
 src/config/config.hpp | 111 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 src/config/config.hpp

(limited to 'src/config/config.hpp')

diff --git a/src/config/config.hpp b/src/config/config.hpp
new file mode 100644
index 0000000..ea28388
--- /dev/null
+++ b/src/config/config.hpp
@@ -0,0 +1,111 @@
+/**
+ * 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
-- 
cgit v1.2.3