Add attribute macro to enable the warning for missed events

Author: CatThingy

crates/bevy_ecs/macros/src/component.rs

@@ -4,24 +4,6 @@ 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_event(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::event::Event for #struct_name #type_generics #where_clause {
-        }
-    })
-}
-
 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();

crates/bevy_ecs/macros/src/lib.rs

@@ -1,6 +1,7 @@
 extern crate proc_macro;
 
 mod component;
+mod event;
 mod fetch;
 mod set;
 mod states;
@@ -482,9 +483,9 @@ pub(crate) fn bevy_ecs_path() -> syn::Path {
     BevyManifest::default().get_path("bevy_ecs")
 }
 
-#[proc_macro_derive(Event)]
+#[proc_macro_derive(Event, attributes(event))]
 pub fn derive_event(input: TokenStream) -> TokenStream {
-    component::derive_event(input)
+    event::derive_event(input)
 }
 
 #[proc_macro_derive(Resource)]