Add derive macro, copying directly from derive(Component) macro

Author: alice-i-cecile

crates/bevy_ecs/macros/src/component.rs

@@ -4,6 +4,24 @@ use proc_macro2::{Span, TokenStream as TokenStream2};
 use quote::{quote, ToTokens};
 use syn::{parse_macro_input, parse_quote, DeriveInput, Error, Ident, Path, Result};
 
+pub fn derive_resource(input: TokenStream) -> TokenStream {
+    let mut ast = parse_macro_input!(input as DeriveInput);
+    let bevy_ecs_path: Path = crate::bevy_ecs_path();
+
+    ast.generics
+        .make_where_clause()
+        .predicates
+        .push(parse_quote! { Self: Send + Sync + 'static });
+
+    let struct_name = &ast.ident;
+    let (impl_generics, type_generics, where_clause) = &ast.generics.split_for_impl();
+
+    TokenStream::from(quote! {
+        impl #impl_generics #bevy_ecs_path::component::Resource for #struct_name #type_generics #where_clause {
+        }
+    })
+}
+
 pub fn derive_component(input: TokenStream) -> TokenStream {
     let mut ast = parse_macro_input!(input as DeriveInput);
     let bevy_ecs_path: Path = crate::bevy_ecs_path();

crates/bevy_ecs/macros/src/lib.rs

@@ -480,6 +480,11 @@ pub(crate) fn bevy_ecs_path() -> syn::Path {
     BevyManifest::default().get_path("bevy_ecs")
 }
 
+#[proc_macro_derive(Resource)]
+pub fn derive_resource(input: TokenStream) -> TokenStream {
+    component::derive_resource(input)
+}
+
 #[proc_macro_derive(Component, attributes(component))]
 pub fn derive_component(input: TokenStream) -> TokenStream {
     component::derive_component(input)