Better structure

src/macros.rs

@@ -0,0 +1,15 @@
+#[macro_export]
+macro_rules! export_plugin {
+    ($plugin_type:ty) => {
+        static PLUGIN: std::sync::Mutex<Option<$plugin_type>> = std::sync::Mutex::new(None);
+
+        #[unsafe(no_mangle)]
+        pub extern "C" fn init() {
+            let mut plugin = PLUGIN.lock().unwrap();
+            *plugin = Some(<$plugin_type>::default());
+            if let Some(plugin) = plugin.as_mut() {
+                plugin.init();
+            }
+        }
+    };
+}