feat(derive): implement derive(Action)

crate/bevy_controls_derive/Cargo.toml

@@ -25,6 +25,8 @@ proc-macro = true
 # strum = "0.25.0"
 # strum_macros = "0.25.3"
 bevy_controls = { path = "./../bevy_controls" } 
+syn = "1.0"
+quote = "1.0"
 
 [dev-dependencies]
 env_logger = "0.10.1"

crate/bevy_controls_derive/src/lib.rs

@@ -1,7 +1,25 @@
 extern crate proc_macro;
+
 use proc_macro::TokenStream;
+use syn;
+use quote::quote;
+use bevy_controls::contract::{Action, ActionInner};
 
 #[proc_macro_derive(Action)]
-pub fn action(_input: TokenStream) -> TokenStream {
+pub fn action(input: TokenStream) -> TokenStream {
-  todo!("urmom")
+  // Construct a representation of Rust code as a syntax tree
+  // that we can manipulate
+  let ast = syn::parse(input).unwrap();
+
+  // Build the trait implementation
+  impl_hello_macro(&ast)
+}
+
+fn impl_hello_macro(ast: &syn::DeriveInput) -> TokenStream {
+  let name = &ast.ident;
+  let gen = quote! {
+      impl Action for #name {}
+      impl ActionInner for #name {}
+  };
+  gen.into()
 }