Immutability

src/main.rs

             .expect("Couldn't find post listing item template");
 
     let post_paths = read_posts_dir(&cwd.join("posts"));
-    let mut posts: Vec<Post> = vec![];
-    for path in post_paths {
-        match path {
+    let posts = post_paths
+        .into_iter()
+        .map(|path| match path {
             Ok(p) => {
                 let post = parse_post(p.path());
                 render_post(&cwd, &layout_template, &post_template, &post);
-                posts.push(post);
+                post
             }
             Err(err) => panic!(err),
-        }
-    }
+        }).collect();
 
     render_post_listing(&cwd, &layout_template, &post_item_template, &posts);
 }