Chunking the blog posts for the stream.

src/command/build/render.rs

@@ -100,8 +100,30 @@ impl SiteRenderer {
         //
         // Steps: pass each RenderBlogStream to dust as the context to render index.html and any additional stream pages.
 
-        for blog_post in &self.blog_posts {
-            println!("{:?}", blog_post.get_date()?);
+        // Sort blog posts by date, newest first.
+        let sorted_blog_posts = {
+            let mut sorted_blog_posts: Vec<_> = self.blog_posts.iter().collect();
+            sorted_blog_posts
+                .sort_by_key(|blog_post| (blog_post.get_date(), blog_post.id.as_str()));
+            sorted_blog_posts.reverse();
+            sorted_blog_posts
+        };
+
+        for blog_post in &sorted_blog_posts {
+            if blog_post.get_date().is_none() {
+                return Err(format!("Blog post {} does not have a date.", blog_post.id).into());
+            }
+        }
+
+        // Group blog posts based on # of posts per page.
+        let stream_chunks: Vec<_> = sorted_blog_posts
+            .chunks(config.get_stream_entries_per_page())
+            .collect();
+
+        // For each group, create a RenderBlogStream.
+        let num_stream_pages = stream_chunks.len();
+        for chunk in stream_chunks {
+            // foo
         }
         Ok(())
     }