Working-ish plugin thingy

test-plugin/.gitignore

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+/target

test-plugin/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "test-plugin"
+version = "0.1.0"

test-plugin/Cargo.toml

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+[package]
+name = "test-plugin"
+version = "0.1.0"
+edition = "2024"
+
+[lib]
+crate-type = ["cdylib"]

test-plugin/src/lib.rs

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+pub trait Plugin {
+    fn init(&mut self);
+}
+
+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();
+            }
+        }
+    };
+}
+
+#[derive(Default)]
+pub struct MyPlugin;
+
+impl Plugin for MyPlugin {
+    fn init(&mut self) {
+        println!("MyPlugin initialized!");
+    }
+}
+
+export_plugin!(MyPlugin);