ephemeral_rollups_sdk_attribute_commit/
lib.rs

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extern crate proc_macro;
use proc_macro::TokenStream;
use quote::quote;
use syn::parse::Parser;
use syn::{parse_macro_input, Field, Fields, ItemStruct};

#[proc_macro_attribute]
pub fn commit(_attr: TokenStream, item: TokenStream) -> TokenStream {
    let input = parse_macro_input!(item as ItemStruct);

    let name = &input.ident;
    let expanded =
        if let Fields::Named(fields_named) = &input.fields {
            let mut has_magic_program = false;
            let mut has_magic_context = false;

            for field in &fields_named.named {
                if let Some(ident) = &field.ident {
                    if ident == "magic_program" {
                        has_magic_program = true;
                    } else if ident == "magic_context" {
                        has_magic_context = true;
                    }
                }
            }

            let mut new_fields = fields_named.named.clone();

            if !has_magic_program {
                new_fields.push(
                    Field::parse_named
                        .parse2(quote! {
                            pub magic_program: Program<'info, MagicProgram>
                        })
                        .unwrap(),
                );
            }

            if !has_magic_context {
                new_fields.push(Field::parse_named.parse2(quote! {
                #[account(mut, address = ephemeral_rollups_sdk::consts::MAGIC_CONTEXT_ID)]
                /// CHECK:`
                pub magic_context: AccountInfo<'info>
            }).unwrap());
            }

            quote! {
                #[derive(Accounts)]
                pub struct #name<'info> {
                    #new_fields
                }
            }
        } else {
            quote! {
                compile_error!("Commit attribute can only be used with structs with named fields");
            }
        };

    TokenStream::from(expanded)
}