Working-ish plugin thingy

src/lib.rs

@@ -0,0 +1,20 @@
+pub trait Plugin {
+    fn init(&mut self);
+}
+
+#[macro_export]
+macro_rules! export_plugin {
+    ($plugin_type:ty) => {
+        static mut PLUGIN: Option<$plugin_type> = None;
+
+        #[no_mangle]
+        pub extern "C" fn init() {
+            unsafe {
+                PLUGIN = Some(<$plugin_type>::default());
+                if let Some(plugin) = PLUGIN.as_mut() {
+                    plugin.init();
+                }
+            }
+        }
+    };
+}

src/main.rs

@@ -0,0 +1,20 @@
+use wasmtime::*;
+
+fn load_plugin(wasm_path: &str) -> anyhow::Result<()> {
+    let engine = Engine::default();
+    let mut linker = Linker::new(&engine);
+    let mut store = Store::new(&engine, ());
+
+    let module = Module::from_file(&engine, wasm_path)?;
+    let instance = linker.instantiate(&mut store, &module)?;
+
+    let init = instance.get_typed_func::<(), ()>(&mut store, "init")?;
+    init.call(&mut store, ())?;
+
+    Ok(())
+}
+
+fn main() -> anyhow::Result<()> {
+    load_plugin("plugins/test_plugin.wasm")?;
+    Ok(())
+}