Remove category from global settings.

This setting does not impact parsing so we can iterate over the final document to find the keywords.

src/context/global_settings.rs

@@ -12,8 +12,6 @@ pub struct GlobalSettings<'g, 's> {
     pub radio_targets: Vec<&'g Vec<Object<'s>>>,
     pub file_access: &'g dyn FileAccessInterface,
     pub in_progress_todo_keywords: BTreeSet<String>,
-    pub category: Option<String>,
-
     pub complete_todo_keywords: BTreeSet<String>,
     /// Set to true to allow for plain lists using single letters as the bullet in the same way that numbers are used.
     ///
@@ -41,7 +39,6 @@ impl<'g, 's> GlobalSettings<'g, 's> {
                 working_directory: None,
             },
             in_progress_todo_keywords: BTreeSet::new(),
-            category: None,
             complete_todo_keywords: BTreeSet::new(),
             list_allow_alphabetical: false,
             tab_width: DEFAULT_TAB_WIDTH,

src/parser/document.rs

@@ -149,7 +149,7 @@ fn document_org_source<'b, 'g, 'r, 's>(
     let new_context = context.with_global_settings(&new_settings);
     let context = &new_context;
 
-    let (remaining, document) =
+    let (remaining, mut document) =
         _document(context, input).map(|(rem, out)| (Into::<&str>::into(rem), out))?;
     {
         // If there are radio targets in this document then we need to parse the entire document again with the knowledge of the radio targets.
@@ -173,6 +173,21 @@ fn document_org_source<'b, 'g, 'r, 's>(
             return Ok((remaining.into(), document));
         }
     }
+
+    // Find final in-buffer settings that do not impact parsing
+    document.category = Into::<AstNode>::into(&document)
+        .into_iter()
+        .filter_map(|ast_node| {
+            if let AstNode::Keyword(ast_node) = ast_node {
+                if ast_node.key.eq_ignore_ascii_case("category") {
+                    return Some(ast_node);
+                }
+            }
+            None
+        })
+        .last()
+        .map(|kw| kw.value.to_owned());
+
     Ok((remaining.into(), document))
 }
 
@@ -191,7 +206,7 @@ fn _document<'b, 'g, 'r, 's>(
         remaining,
         Document {
             source: source.into(),
-            category: context.get_global_settings().category.clone(),
+            category: None,
             path: None,
             zeroth_section,
             children,

src/parser/in_buffer_settings.rs

@@ -111,14 +111,6 @@ pub(crate) fn apply_in_buffer_settings<'g, 's, 'sf>(
         }
     }
 
-    // Category
-    for kw in keywords
-        .iter()
-        .filter(|kw| kw.key.eq_ignore_ascii_case("category"))
-    {
-        new_settings.category = Some(kw.value.to_owned());
-    }
-
     Ok(new_settings)
 }