Added initial JSON configuration support

sdl_helpers.h

@@ -1,9 +1,13 @@
 #ifndef SDL_HELPERS_H_
 #define SDL_HELPERS_H_
 
-#include <string>
 #include <SDL2/SDL_ttf.h>
 
+#include <iostream>
+#include <string>
+
+#include "json.hpp"
+
 // Call this before everything
 // Prints its messages
 bool init_sdl();
@@ -15,4 +19,15 @@ void clean_sdl();
 // Can return NULL
 TTF_Font* get_font(const std::string& filename, int size);
 
+// Reads the file and tries to parse a JSON file with comments
+// cfg - output json struct
+// filename - filepath to open and read
+// log - output errors to this ostream, silent if NULL
+bool read_config_json(nlohmann::json& cfg, const std::string& filename, std::ostream* log = &std::cout);
+
+// JSON Extractors - They do not override already set values if key is not present
+
+void json_extract(const nlohmann::json& j, const std::string& key, std::string& out);
+void json_extract(const nlohmann::json& j, const std::string& key, int& out);
+
 #endif // SDL_HELPERS_H_