context: Add program directory's path

src/main.cpp

@@ -82,6 +82,15 @@ int main(int ac, char **av) {
     context->config_json["fps"] = 800;
   }
 
+  // Get program directory
+  char path_buf[1024];
+  ssize_t len = readlink("/proc/self/exe", path_buf, sizeof(path_buf)-1);
+  if (len == -1) {
+    std::cerr << "Failed to determine program directory" << std::endl;
+    return 1;
+  }
+  context->program_dir = std::filesystem::path(path_buf).parent_path();
+
   InitWindow(context->config_json["screen_width"], context->config_json["screen_height"],
              &av[0][2]);