bevy/crates/bevy_gizmos/macros/src/lib.rs
raldone01 760d0a3100
Use one BevyManifest instance in proc macros (#16766)
# Objective

- Minor consistency improvement in proc macro code.
- Remove `get_path_direct` since it was only used once anyways and
doesn't add much.

## Solution
- Possibly a minor performance improvement since the `Cargo.toml` wont
be parsed as often.

## Testing

- I don't think it breaks anything.
- This is my first time working on bevy itself. Is there a script to do
a quick verify of my pr?

## Other PR

Similar to #7536 but has no extra dependencies.

Co-authored-by: François Mockers <mockersf@gmail.com>
2024-12-15 15:00:05 +00:00

29 lines
1.1 KiB
Rust

#![cfg_attr(docsrs, feature(doc_auto_cfg))]
//! Derive implementations for `bevy_gizmos`.
use bevy_macro_utils::BevyManifest;
use proc_macro::TokenStream;
use quote::quote;
use syn::{parse_macro_input, parse_quote, DeriveInput, Path};
/// Implements the [`GizmoConfigGroup`] trait for a gizmo config group type.
#[proc_macro_derive(GizmoConfigGroup)]
pub fn derive_gizmo_config_group(input: TokenStream) -> TokenStream {
let mut ast = parse_macro_input!(input as DeriveInput);
let bevy_gizmos_path: Path = BevyManifest::shared().get_path("bevy_gizmos");
let bevy_reflect_path: Path = BevyManifest::shared().get_path("bevy_reflect");
ast.generics.make_where_clause().predicates.push(
parse_quote! { Self: #bevy_reflect_path::Reflect + #bevy_reflect_path::TypePath + Default},
);
let struct_name = &ast.ident;
let (impl_generics, type_generics, where_clause) = &ast.generics.split_for_impl();
TokenStream::from(quote! {
impl #impl_generics #bevy_gizmos_path::config::GizmoConfigGroup for #struct_name #type_generics #where_clause {
}
})
}