Review comments

CHANGELOG.md

@@ -4,6 +4,21 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+### Added
+- It's now possible to associate custom static metadata with builders:
+  ```rust
+  #[component]
+  #[interface(dyn EventHandler)]
+  #[meta(EventHandlerDesc { event_type: "A"})]
+  #[meta(EventHandlerDesc { event_type: "B"})]
+  struct EventHandlerAB;
+  ```
+- New `BuilderExt` trait was added to provide convenient access to metadata and interfaces
+- New `Catalog::builders_for_with_meta()` allows to filter builders by metadata with a custom predicate
+### Changed
+- `Builder::interfaces` method was changed to iteration via callback to avoid allocating a `Vec`
+
 ## [0.8.1] - 2024-05-27
 ### Fixed
 - Fixed pedantic linter warnings

dill-impl/src/lib.rs

@@ -148,12 +148,12 @@ fn implement_builder(
     let meta_provide: Vec<_> = meta
         .iter()
         .enumerate()
-        .map(|(i, e)| implmenent_meta_provide(i, e))
+        .map(|(i, e)| implement_meta_provide(i, e))
         .collect();
     let meta_vars: Vec<_> = meta
         .iter()
         .enumerate()
-        .map(|(i, e)| implmenent_meta_var(i, e))
+        .map(|(i, e)| implement_meta_var(i, e))
         .collect();
 
     let mut arg_override_fn_field = Vec::new();
@@ -423,15 +423,15 @@ fn implement_arg(
 
 /////////////////////////////////////////////////////////////////////////////////////////
 
-fn implmenent_meta_var(index: usize, expr: &syn::ExprStruct) -> proc_macro2::TokenStream {
+fn implement_meta_var(index: usize, expr: &syn::ExprStruct) -> proc_macro2::TokenStream {
     let ident = format_ident!("_meta_{index}");
     let typ = &expr.path;
     quote! {
         const #ident: #typ = #expr;
     }
 }
 
-fn implmenent_meta_provide(index: usize, _expr: &syn::ExprStruct) -> proc_macro2::TokenStream {
+fn implement_meta_provide(index: usize, _expr: &syn::ExprStruct) -> proc_macro2::TokenStream {
     let ident = format_ident!("_meta_{index}");
     quote! {
         if !clb(&Self::#ident) { return }