muta-codec-derive 0.2.2

Muta fixed codec derive procedural macros.
Documentation 
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use proc_macro2::TokenStream;
use quote::quote;

pub fn encode_field(index: usize, field: &syn::Field) -> TokenStream {
    let ident = if let Some(ident) = &field.ident {
        quote! { #ident }
    } else {
        let index = syn::Index::from(index);
        quote! { #index }
    };
    let id = quote! { self.#ident };

    match &field.ty {
        syn::Type::Array(_array) => {
            let bytes = quote! { #id.to_vec() };
            quote! { stream.append(&#bytes); }
        }
        syn::Type::Path(path) => {
            let top_segment = path
                .path
                .segments
                .first()
                .expect("there must be at least 1 segment");
            let ident = &top_segment.ident;
            if ident == "Vec" {
                quote! {
                    let temp: Vec<Vec<u8>> = #id.iter().map(|item| item.encode_fixed().expect("fixed_codec not supported").to_vec()).collect();
                    stream.append_list::<Vec<u8>, _>(&temp);
                }
            } else {
                quote! {
                    let temp: Vec<u8> = #id.encode_fixed().expect("fixed_codec not supported").to_vec();
                    stream.append(&temp);
                }
            }
        }

        _ => panic!("fixed_codec_derive not supported"),
    }
}