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extern crate proc_macro; use proc_macro::TokenStream; use quote::quote; use syn::{parse_macro_input, ItemFn}; fn creator_main_logic(_attr: TokenStream, item: TokenStream) -> TokenStream { let input = parse_macro_input!(item as ItemFn); if input.sig.ident != "main" { panic!("creator_main can only be used on a function called 'main'") } TokenStream::from(quote! { #[no_mangle] #[cfg(target_os = "android")] unsafe extern "C" fn ANativeActivity_onCreate( activity: *mut std::os::raw::c_void, saved_state: *mut std::os::raw::c_void, saved_state_size: usize, ) { creator::ndk_glue::init( activity as _, saved_state as _, saved_state_size as _, main, ); } #[allow(unused)] #input }) } #[proc_macro_attribute] pub fn creator_main(attr: TokenStream, item: TokenStream) -> TokenStream { creator_main_logic(attr, item) }