Store the title in BlogPostPage.

src/blog_post/page.rs

@@ -7,7 +7,7 @@ pub(crate) struct BlogPostPage {
     /// Relative path from the root of the blog post.
     path: PathBuf,
 
-    title: String,
+    title: Option<String>,
 }
 
 impl BlogPostPage {
@@ -18,7 +18,20 @@ impl BlogPostPage {
         let path = path.into();
         Ok(BlogPostPage {
             path,
-            title: "".to_owned(),
+            title: get_title(&document),
         })
     }
 }
+
+fn get_title(document: &organic::types::Document<'_>) -> Option<String> {
+    organic::types::AstNode::from(document)
+        .iter_all_ast_nodes()
+        .filter_map(|node| match node {
+            organic::types::AstNode::Keyword(kw) if kw.key.eq_ignore_ascii_case("title") => {
+                Some(kw)
+            }
+            _ => None,
+        })
+        .last()
+        .map(|kw| kw.value.to_owned())
+}