feat: allow the `documentclass` field in document metadata

With the new pulldown-cmark parser for codegen, we are explicit about
what fields we allow in the YAML document metadata block. We currently
don't allow the `documentclass` field. Allow it. It's a useful way for
controlling typesetting vie LaTeX to PDF.

Sponsored-by: author

1 files changed, 4 insertions, 0 deletions

diff --git a/src/ast.rs b/src/ast.rs
index 9543efd..6255fb5 100644
--- a/src/ast.rs
+++ b/src/ast.rs
@@ -279,6 +279,7 @@ struct Metadata {
     bibliography: Option<Vec<PathBuf>>,
     bindings: Option<Vec<PathBuf>>,
     functions: Option<Vec<PathBuf>>,
+    documentclass: Option<String>,
 }
 
 impl Metadata {
@@ -316,6 +317,9 @@ impl Metadata {
         if let Some(v) = &self.functions {
             map.insert(s("functions"), meta_path_bufs(v));
         }
+        if let Some(v) = &self.documentclass {
+            map.insert(s("documentclass"), meta_string(v));
+        }
         event!(
             Level::TRACE,
             ?self,