Starting a compare properties document function.

src/compare/diff.rs

@@ -23,6 +23,7 @@ use super::sexp::unquote;
 use super::sexp::Token;
 use super::util::assert_no_children;
 use super::util::compare_children;
+use super::util::compare_children_iter;
 use super::util::compare_standard_properties;
 use super::util::get_property;
 use super::util::get_property_boolean;
@@ -438,6 +439,63 @@ pub fn compare_document<'b, 's>(
 }
 
 fn _compare_document<'b, 's>(
+    source: &'s str,
+    emacs: &'b Token<'s>,
+    rust: &'b Document<'s>,
+) -> Result<DiffEntry<'b, 's>, Box<dyn std::error::Error>> {
+    let mut this_status = DiffStatus::Good;
+    let mut child_status = Vec::new();
+    let mut message = None;
+
+    // compare_children_iter(
+    //     source,
+    //     emacs,
+    //     rust.zeroth_section
+    //         .iter()
+    //         .map(Into::<AstNode>::into)
+    //         .chain(rust.children.iter().map(Into::<AstNode>::into)),
+    //     &mut child_status,
+    //     &mut this_status,
+    //     &mut message,
+    // )?;
+
+    for diff in compare_properties!(
+        source,
+        emacs,
+        rust,
+        // (
+        //     EmacsField::Optional(":name"),
+        //     |r| r.name,
+        //     compare_property_quoted_string
+        // ),
+        (
+            EmacsField::Optional(":caption"),
+            compare_identity,
+            compare_noop
+        )
+    ) {
+        match diff {
+            ComparePropertiesResult::NoChange => {}
+            ComparePropertiesResult::SelfChange(new_status, new_message) => {
+                this_status = new_status;
+                message = new_message
+            }
+            ComparePropertiesResult::DiffEntry(diff_entry) => child_status.push(diff_entry),
+        }
+    }
+
+    Ok(DiffResult {
+        status: this_status,
+        name: rust.get_elisp_name(),
+        message,
+        children: child_status,
+        rust_source: rust.get_source(),
+        emacs_token: emacs,
+    }
+    .into())
+}
+
+fn _old_compare_document<'b, 's>(
     _source: &'s str,
     emacs: &'b Token<'s>,
     rust: &'b Document<'s>,