Compare todo-type on headlines.

src/types/document.rs

@@ -13,7 +13,7 @@ pub struct Document<'s> {
 pub struct Heading<'s> {
     pub source: &'s str,
     pub stars: usize,
-    pub todo_keyword: Option<&'s str>,
+    pub todo_keyword: Option<(TodoKeywordType, &'s str)>,
     // TODO: add todo-type enum
     pub title: Vec<Object<'s>>,
     pub tags: Vec<&'s str>,
@@ -32,6 +32,12 @@ pub enum DocumentElement<'s> {
     Section(Section<'s>),
 }
 
+#[derive(Debug)]
+pub enum TodoKeywordType {
+    Todo,
+    Done,
+}
+
 impl<'s> Source<'s> for Document<'s> {
     fn get_source(&'s self) -> &'s str {
         self.source

src/types/mod.rs

@@ -8,6 +8,7 @@ pub use document::Document;
 pub use document::DocumentElement;
 pub use document::Heading;
 pub use document::Section;
+pub use document::TodoKeywordType;
 pub use element::Element;
 pub use greater_element::Drawer;
 pub use greater_element::DynamicBlock;