Create a xdg_path function

louloulibs/utils/xdg.cpp

@@ -0,0 +1,20 @@
+#include <utils/xdg.hpp>
+#include <cstdlib>
+
+#include "louloulibs.h"
+
+std::string xdg_config_path(const std::string& filename)
+{
+  const char* xdg_config_home = ::getenv("XDG_CONFIG_HOME");
+  if (xdg_config_home && xdg_config_home[0] == '/')
+    return std::string{xdg_config_home} + "/" PROJECT_NAME "/" + filename;
+  else
+    {
+      const char* home = ::getenv("HOME");
+      if (home)
+        return std::string{home} + "/" ".config" "/" PROJECT_NAME "/" + filename;
+      else
+        return filename;
+    }
+}
+