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

#[proc_macro_attribute]
pub fn fiddler_registration_func(_attr: TokenStream, input: TokenStream) -> TokenStream {
    let new_input = parse_macro_input!(input as ItemFn);
    let sig = new_input
        .sig
        .clone()
        .ident
        .span()
        .unwrap()
        .source_text()
        .unwrap();
    let signature: proc_macro2::TokenStream = format!(
        "pub fn fiddler_register_plugin() -> Result<(), Error> {{\n\t{}()\n}}",
        sig
    )
    .parse()
    .unwrap();
    let expanded = quote! {
        #signature
        #new_input
    };
    TokenStream::from(expanded)
}