Fix post listing rendering

src/main.rs

@@ -70,14 +70,19 @@ fn render_post_listing(
     post_item_template: &str,
     posts: &Vec<Post>,
 ) {
-    let post_listing = posts
-        .iter()
-        .map(|ref post| {
-            post_item_template
-                .replace("{{ slug }}", &post.slug)
-                .replace("{{ title }}", &post.title)
-        }).collect::<Vec<String>>()
-        .join("\n");
+    let post_listing_template = fs::read_to_string(cwd.join("templates").join("index.html"))
+        .expect("Couldn't read templates/index.html");
+    let post_listing = post_listing_template.replace(
+        "{{ post_listing }}",
+        &posts
+            .iter()
+            .map(|ref post| {
+                post_item_template
+                    .replace("{{ slug }}", &post.slug)
+                    .replace("{{ title }}", &post.title)
+            }).collect::<Vec<String>>()
+            .join("\n"),
+    );
 
     let output = layout.replace("{{ contents }}", &post_listing);
     fs::write(cwd.join("public").join("index.html"), &output).expect("Unable to write file");