mockup how to get a function stuff into Lua

core/sile.lua

@@ -16,6 +16,10 @@ SILE = {}
 --- Fields
 -- @section fields
 
+--- Functions implemented in Rust, to be moved to approprate places in the API
+-- @table SILE.rusile
+SILE._rusile = require("rusile")
+
 --- Machine friendly short-form version.
 -- Semver, prefixed with "v", possible postfixed with ".r" followed by VCS version information.
 -- @string version

rusile/src/lib.rs

@@ -3,5 +3,12 @@ use mlua::prelude::*;
 #[mlua::lua_module]
 fn rusile(lua: &Lua) -> LuaResult<LuaTable> {
     let exports = lua.create_table().unwrap();
+    let foo: LuaFunction = lua.create_function(foo).unwrap();
+    exports.set("foo", foo)?;
     Ok(exports)
 }
+
+fn foo<'a>(_lua: &'a Lua, (): ()) -> LuaResult<()> {
+    eprintln!("e print from rusile not rustle");
+    Ok(())
+}