very early version of plugin system

src/server/plugins/backend_lua.rs

@@ -0,0 +1,38 @@
+use super::Backend;
+use mlua::prelude::*;
+
+pub struct BackendLua {
+    lua: Lua,
+}
+
+impl BackendLua {
+    pub fn new() -> Self {
+        let lua = Lua::new();
+
+        Self {
+            lua,
+        }
+    }
+}
+
+impl Backend for BackendLua {
+    fn load(&mut self, code: String) -> anyhow::Result<()> {
+        self.lua.load(code).exec().map_err(|e| { error!("[LUA] {:?}", e); e })?;
+        Ok(())
+    }
+
+    fn load_api(&mut self) -> anyhow::Result<()> {
+        let print_fn = self.lua.create_function(|_lua, (msg,): (String,)| {
+            info!("[LUA] {}", msg);
+            Ok(())
+        })?;
+
+        let api = self.lua.create_table()?;
+
+        api.set("print", print_fn)?;
+
+        self.lua.globals().set("MP", api)?;
+
+        Ok(())
+    }
+}