Support reading category from in-buffer-settings.

src/context/global_settings.rs

@@ -12,6 +12,8 @@ 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.
     ///
@@ -39,6 +41,7 @@ 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

@@ -191,7 +191,7 @@ fn _document<'b, 'g, 'r, 's>(
         remaining,
         Document {
             source: source.into(),
-            category: None,
+            category: context.get_global_settings().category.clone(),
             path: None,
             zeroth_section,
             children,

src/parser/in_buffer_settings.rs

@@ -111,6 +111,14 @@ 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)
 }