put names all in one place. some stub code for funcs!

crates/generate/src/funcs.rs

@@ -0,0 +1,23 @@
+use proc_macro2::TokenStream;
+use quote::quote;
+
+use crate::names::Names;
+
+pub fn define_func(names: &Names, func: &witx::InterfaceFunc) -> TokenStream {
+    let ident = names.func(&func.name);
+    let mut args = TokenStream::new();
+
+    for param in func.params.iter() {
+        let name = names.func_param(&param.name);
+        let type_ = names.type_ref(&param.tref);
+        args.extend(quote!(#name: #type_,));
+    }
+
+    let mut rets = TokenStream::new();
+    for result in func.results.iter() {
+        let type_ = names.type_ref(&result.tref);
+        rets.extend(quote!(#type_,));
+    }
+
+    quote!(pub fn #ident(#args) -> (#rets) { unimplemented!() })
+}