extern crate proc_macro;
use proc_macro::TokenStream;
use quote::quote;
use syn::{parse_macro_input, DeriveInput};

#[proc_macro_derive(IRI)]
pub fn derive_iri(input: TokenStream) -> TokenStream {
    let DeriveInput { ident, .. } = parse_macro_input!(input);
    quote! {
        impl std::str::FromStr for #ident {
            type Err = ();
            fn from_str(s: &str) -> Result<Self, Self::Err> {
                let mut ident = #ident::default();
                ident.id = s.into();
                Ok(ident)
            }
        }
    }
    .into()
}