clear out a bunch of old code, reorganize

crates/generate/src/lib.rs

@@ -1,16 +1,36 @@
 extern crate proc_macro;
 
-mod imp;
 mod parse;
+mod types;
 
+use heck::SnakeCase;
 use proc_macro::TokenStream;
 use proc_macro2::TokenStream as TokenStream2;
+use quote::{format_ident, quote};
+use types::define_datatype;
 
 #[proc_macro]
 pub fn from_witx(args: TokenStream) -> TokenStream {
     let args = TokenStream2::from(args);
     let witx_paths = parse::witx_paths(args).expect("parsing macro arguments");
     let doc = witx::load(&witx_paths).expect("loading witx");
-    let out = imp::gen(doc);
-    TokenStream::from(out)
+
+    let mut types = TokenStream2::new();
+    for namedtype in doc.typenames() {
+        let def = define_datatype(&namedtype);
+        types.extend(def);
+    }
+
+    let mut modules = TokenStream2::new();
+    for module in doc.modules() {
+        let modname = format_ident!("{}", module.name.as_str().to_snake_case());
+        let mut fs = TokenStream2::new();
+        for func in module.funcs() {
+            let ident = format_ident!("{}", func.name.as_str().to_snake_case());
+            fs.extend(quote!(pub fn #ident() { unimplemented!() }));
+        }
+        modules.extend(quote!(mod #modname { use super::types::*; #fs }));
+    }
+
+    TokenStream::from(quote!(mod types { #types } #modules))
 }