From 5335cdad99a6d566ea6e83f97012c7954ba93c45 Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Sun, 24 Jul 2022 15:58:30 +0200
Subject: feat: add support for generics

---
 macros/src/injectable_impl.rs | 15 +++++++++++----
 macros/src/lib.rs             | 25 +++++++++++++++++++------
 2 files changed, 30 insertions(+), 10 deletions(-)

(limited to 'macros/src')

diff --git a/macros/src/injectable_impl.rs b/macros/src/injectable_impl.rs
index 8bb6c7a..822a432 100644
--- a/macros/src/injectable_impl.rs
+++ b/macros/src/injectable_impl.rs
@@ -1,5 +1,6 @@
 use quote::{quote, ToTokens};
 use syn::parse::{Parse, ParseStream};
+use syn::Generics;
 use syn::{
     parse_str, punctuated::Punctuated, token::Comma, ExprMethodCall, FnArg,
     GenericArgument, Ident, ImplItem, ImplItemMethod, ItemImpl, Path, PathArguments,
@@ -12,6 +13,7 @@ pub struct InjectableImpl
 {
     pub dependency_types: Vec<Type>,
     pub self_type: Type,
+    pub generics: Generics,
     pub original_impl: ItemImpl,
 }
 
@@ -25,6 +27,7 @@ impl Parse for InjectableImpl
                     Ok(dependency_types) => Ok(Self {
                         dependency_types,
                         self_type: impl_parsed_input.self_ty.as_ref().clone(),
+                        generics: impl_parsed_input.generics.clone(),
                         original_impl: impl_parsed_input,
                     }),
                     Err(error_msg) => Err(input.error(error_msg)),
@@ -39,17 +42,21 @@ impl InjectableImpl
 {
     pub fn expand(&self) -> proc_macro2::TokenStream
     {
-        let original_impl = &self.original_impl;
-        let self_type = &self.self_type;
+        let Self {
+            dependency_types,
+            self_type,
+            generics,
+            original_impl,
+        } = self;
 
         let di_container_var: Ident = parse_str(DI_CONTAINER_VAR_NAME).unwrap();
 
-        let get_dependencies = Self::_create_get_dependencies(&self.dependency_types);
+        let get_dependencies = Self::_create_get_dependencies(dependency_types);
 
         quote! {
             #original_impl
 
-            impl syrette::interfaces::injectable::Injectable for #self_type {
+            impl #generics syrette::interfaces::injectable::Injectable for #self_type {
                 fn resolve(
                     #di_container_var: &syrette::DIContainer
                 ) -> syrette::libs::error_stack::Result<
diff --git a/macros/src/lib.rs b/macros/src/lib.rs
index 73fb2dc..d65df68 100644
--- a/macros/src/lib.rs
+++ b/macros/src/lib.rs
@@ -19,27 +19,40 @@ use libs::intertrait_macros::gen_caster::generate_caster;
 /// Makes a struct injectable. Thereby usable with `DIContainer`.
 ///
 /// # Arguments
-/// * A interface trait the struct implements.
+/// * (Optional) A interface trait the struct implements.
 ///
 /// # Panics
 /// If the attributed item is not a impl.
+///
+/// # Important
+/// If the interface trait argument is excluded, you should either manually
+/// declare the interface with the `declare_interface` macro or use
+/// the `di_container_bind` macro to create a DI container binding.
 #[proc_macro_attribute]
 pub fn injectable(args_stream: TokenStream, impl_stream: TokenStream) -> TokenStream
 {
-    let InjectableMacroArgs {
-        interface: interface_type_path,
-    } = parse_macro_input!(args_stream);
+    let should_declare_interface = !args_stream.is_empty();
 
     let injectable_impl: InjectableImpl = parse(impl_stream).unwrap();
 
     let expanded_injectable_impl = injectable_impl.expand();
 
-    let self_type = &injectable_impl.self_type;
+    let maybe_decl_interface = if should_declare_interface {
+        let InjectableMacroArgs { interface } = parse_macro_input!(args_stream);
+
+        let self_type = &injectable_impl.self_type;
+
+        quote! {
+            syrette::declare_interface!(#self_type -> #interface);
+        }
+    } else {
+        quote! {}
+    };
 
     quote! {
         #expanded_injectable_impl
 
-        syrette::declare_interface!(#self_type -> #interface_type_path);
+        #maybe_decl_interface
     }
     .into()
 }
-- 
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