sdk-builder: actually pass on generated tokens

sdk-builder/src/main.rs

@@ -843,11 +843,22 @@ pub mod rust {
 
                 #field_trait
             };
-            todo!()
+
+            Ok(tokens)
         }
 
-        fn generate_package(&self, pkg: &ProcessedPackage) -> anyhow::Result<()> {
+        fn generate_package(
+            &self,
+            pkg: &ProcessedPackage,
+            feature_gate: bool,
+        ) -> anyhow::Result<TokenStream> {
             let pkg_name = canonicalize_name(&pkg.name);
+            log::info!(
+                "generating package \"{pkg_name}\" with {} types..",
+                pkg.types.len()
+            );
+
+            let mut pkg_tokens = TokenStream::new();
 
             for (_id, ty) in &pkg.types {
                 let tokens = match ty {
@@ -857,18 +868,35 @@ pub mod rust {
                     UnrealType::Enum(enum0) => self.generate_enum(enum0)?,
                 };
 
-                println!("{tokens}");
+                pkg_tokens.extend(tokens);
             }
 
-            quote! {
-                #[cfg(feature = "#pkg_name")]
-                pub mod #pkg_name {
-                    #![allow(dead_code, unused_imports, non_snake_case, non_camel_case_types)]
+            let deps = pkg
+                .dependencies
+                .iter()
+                .filter_map(|id| self.sdk.packages.get(id))
+                .map(|package| format!("`{}`", package.name))
+                .join(",");
 
-                }
+            let doc_msg = format!("Package `{pkg_name}` depends on the features {deps}.");
+
+            let feature_gate = if feature_gate {
+                Some(quote! {
+                    #![doc = #doc_msg]
+                    #![cfg(feature = "#pkg_name")]
+                })
+            } else {
+                None
             };
 
-            todo!()
+            Ok(quote! {
+                pub mod #pkg_name {
+                    #feature_gate
+                    #![allow(dead_code, unused_imports, non_snake_case, non_camel_case_types)]
+
+                    #pkg_tokens
+                }
+            })
         }
     }
 }