codegen: fix compact unnamed fields (paritytech#327)

* codegen: fix compact unnamed fields

* Fmt

* Regenerate polkadot codegen example.

* Ignore clippy for generated code

* Limit the number of test threads

* Revert "Limit the number of test threads"

This reverts commit f1947dc.

* Delete duplicate node_runtime metadata

* Update node_runtime metadata

* Update balances events

codegen/src/types/tests.rs

@@ -325,6 +325,73 @@ fn generate_enum() {
     )
 }
 
+#[test]
+fn compact_fields() {
+    #[allow(unused)]
+    #[derive(TypeInfo)]
+    struct S {
+        #[codec(compact)]
+        a: u32,
+    }
+
+    #[allow(unused)]
+    #[derive(TypeInfo)]
+    struct TupleStruct(#[codec(compact)] u32);
+
+    #[allow(unused)]
+    #[derive(TypeInfo)]
+    enum E {
+        A {
+            #[codec(compact)]
+            a: u32,
+        },
+        B(#[codec(compact)] u32),
+    }
+
+    let mut registry = Registry::new();
+    registry.register_type(&meta_type::<S>());
+    registry.register_type(&meta_type::<TupleStruct>());
+    registry.register_type(&meta_type::<E>());
+    let portable_types: PortableRegistry = registry.into();
+
+    let type_gen = TypeGenerator::new(
+        &portable_types,
+        "root",
+        Default::default(),
+        Default::default(),
+    );
+    let types = type_gen.generate_types_mod();
+    let tests_mod = get_mod(&types, MOD_PATH).unwrap();
+
+    assert_eq!(
+        tests_mod.into_token_stream().to_string(),
+        quote! {
+            pub mod tests {
+                use super::root;
+                #[derive(::subxt::codec::Encode, ::subxt::codec::Decode)]
+                pub enum E {
+                    # [codec (index = 0)]
+                    A {
+                        #[codec(compact)]
+                        a: ::core::primitive::u32,
+                    },
+                    # [codec (index = 1)]
+                    B( #[codec(compact)] ::core::primitive::u32,),
+                }
+
+                #[derive(::subxt::codec::Encode, ::subxt::codec::Decode)]
+                pub struct S {
+                    #[codec(compact)] pub a: ::core::primitive::u32,
+                }
+
+                #[derive(::subxt::codec::Encode, ::subxt::codec::Decode)]
+                pub struct TupleStruct(#[codec(compact)] pub ::core::primitive::u32,);
+            }
+        }
+        .to_string()
+    )
+}
+
 #[test]
 fn generate_array_field() {
     #[allow(unused)]

codegen/src/types/type_def.rs

@@ -279,7 +279,7 @@ impl<'a> TypeDefGen<'a> {
             let mut fields_tokens = type_paths
                 .iter()
                 .map(|(ty, ty_name)| {
-                    match ty_name {
+                    let field_type = match ty_name {
                         Some(ty_name) => {
                             let ty = ty_toks(ty_name, ty);
                             if is_struct {
@@ -291,6 +291,11 @@ impl<'a> TypeDefGen<'a> {
                         None => {
                             quote! { #ty }
                         }
+                    };
+                    if ty.is_compact() {
+                        quote!( #[codec(compact)] #field_type  )
+                    } else {
+                        quote!( #field_type  )
                     }
                 })
                 .collect::<Vec<_>>();

tests/integration/codegen/mod.rs

@@ -22,4 +22,5 @@
 /// - run `polkadot --dev --tmp` node locally
 /// - `cargo run --release -p subxt-cli -- codegen | rustfmt --edition=2018 --emit=stdout > tests/integration/codegen/polkadot.rs`
 #[rustfmt::skip]
+#[allow(clippy::all)]
 mod polkadot;