Proc_macro_roids 0.1.0 published

[azriel91]

Hiya, have just published proc_macro_roids, a crate that provide traits and functions to make writing proc macros more ergonomic.

Links:

• crate
• repo
• docs

Motivation:

Imagine a world where proc macros were easy.

Well, hopefully you don't have to imagine any longer!

Example:

1. Append derives.

   #[proc_macro_attribute]
   pub fn copy(_args: TokenStream, item: TokenStream) -> TokenStream {
       // Example input:
       //
       // #[copy]
       // #[derive(Debug)]
       // struct Struct;
       let mut ast = parse_macro_input!(item as DeriveInput);
   
       let derives = parse_quote!(Clone, Copy);
       ast.append_derives(derives);
   
       // Example output:
       //
       // #[derive(Debug, Clone, Copy)]
       // struct Struct;
       TokenStream::from(quote! { #ast })
   }
   

2. Append fields.

   #[proc_macro_attribute]
   pub fn append_fields(_args: TokenStream, item: TokenStream) -> TokenStream {
       // Example input:
       // #[append_fields]
       // struct StructNamed { a: u32, b: i32 }
       let mut ast = parse_macro_input!(item as DeriveInput);
   
       let fields_additional: FieldsNamed = parse_quote!({ c: i64, d: usize });
       ast.append(fields_additional);
   
       // Example output:
       // struct StructNamed { a: u32, b: i32, c: i64, d: usize }
       TokenStream::from(quote! { #ast })
   }
   

More examples are in the README.md and docs.

[Yandros]

I like it a lot!

These are the kind of little helpers that make writing macro_rules-like proc_macros easier: proc_macros are too cumbersome to just use as minor shorthands (e.g., creating a custom basic derive Deref or stuff like that), and I personally end up just using macro_rules! for that although the usage site gets much uglier.

For instance, compare

• #[newtype_deref]
  struct Name(&'static str);
  

with

• newtype_deref! {
      struct Name(&'static str);
  }
  

[azriel91]

Cool thanks! Have fixed those issues (oh no, just realized I missed one), and also got code coverage being reported