feat(proc): add ProcReferences

Add a struct to handle intermediately rendered output.

The intention is something similar to the haskell citeproc server json.

Signed-off-by: Bruce D'Arcus <bdarcus@gmail.com>

processor/src/lib.rs

@@ -5,7 +5,7 @@ SPDX-FileCopyrightText: © 2023 Bruce D'Arcus
 
 use csln::bibliography::reference::InputReference;
 use csln::bibliography::reference::{EdtfString, RefID};
-use csln::bibliography::InputBibliography as Bibliography;
+use csln::bibliography::{self, InputBibliography as Bibliography};
 use csln::citation::Citation;
 use csln::style::locale::Locale;
 use csln::style::options::{Config, MonthFormat, SortKey, SubstituteKey};
@@ -619,15 +619,23 @@ impl ComponentValues for TemplateDate {
 //     assert_eq!(rendered_date, "2020");
 // }
 
+/// The intermediate representation of renderered citations and bibliography..
+#[derive(Debug, Deserialize, Serialize, Clone, JsonSchema)]
+pub struct ProcReferences {
+    pub bibliography: Vec<ProcTemplate>,
+    pub citations: Option<Vec<ProcTemplate>>,
+}
+
 impl Processor {
     /// Render references to AST.
     #[inline]
-    pub fn process_references(&self) -> Vec<ProcTemplate> {
+    pub fn process_references(&self) -> ProcReferences {
         let sorted_references = self.sort_references(self.get_references());
-        sorted_references
+        let bibliography = sorted_references
             .par_iter()
             .map(|reference| self.process_reference(reference))
-            .collect()
+            .collect();
+        ProcReferences { bibliography, citations: None }
     }
 
     /// Render a reference to AST.