use proc_macro::TokenStream;
use proc_macro2::Span;
use quote::quote;
use syn::{parse_macro_input, Ident, ItemFn};

#[proc_macro_attribute]
pub fn register(_attr: TokenStream, input: TokenStream) -> TokenStream {
	let item = parse_macro_input!(input as ItemFn);
	let fn_name = item.sig.ident.to_string().replacen("on_", "has_", 1);
	let fn_name = Ident::new(&fn_name, Span::call_site());
	let output = quote! {
		fn #fn_name(&self) -> bool {
			true
		}
		#item
	};
	output.into()
}