Restoring module name as attr/param for service_tables_macro

rust/psibase_macros/psibase-macros-lib/src/service_tables_macro.rs

@@ -1,16 +1,42 @@
 mod tables;
 
+use darling::{ast::NestedMeta, Error, FromMeta};
 use proc_macro2::TokenStream;
 use proc_macro_error::{abort, emit_error};
 use quote::quote;
 use std::{collections::HashMap, str::FromStr};
 use syn::{Ident, Item, ItemMod, Type};
 use tables::{is_table_attr, process_service_tables};
 
-pub fn service_tables_macro_impl(_attr: TokenStream, item: TokenStream) -> TokenStream {
-    let options_psibase_mod = String::from("psibase");
+#[derive(Debug, FromMeta)]
+#[darling(default)]
+pub struct Options {
+    pub psibase_mod: String,
+}
+
+impl Default for Options {
+    fn default() -> Self {
+        Options {
+            psibase_mod: "psibase".into(),
+        }
+    }
+}
+
+pub fn service_tables_macro_impl(attr: TokenStream, item: TokenStream) -> TokenStream {
+    let attr_args = match NestedMeta::parse_meta_list(attr) {
+        Ok(v) => v,
+        Err(e) => {
+            return TokenStream::from(Error::from(e).write_errors());
+        }
+    };
+    let options: Options = match Options::from_list(&attr_args) {
+        Ok(val) => val,
+        Err(err) => {
+            return err.write_errors().into();
+        }
+    };
+    let psibase_mod = proc_macro2::TokenStream::from_str(&options.psibase_mod).unwrap();
 
-    let psibase_mod = proc_macro2::TokenStream::from_str(&options_psibase_mod).unwrap();
     let item = syn::parse2::<syn::Item>(item).unwrap();
     match item {
         Item::Mod(impl_mod) => process_mod(&psibase_mod, impl_mod),