fix ordering of posts to be l->r chronological

src/main.rs

@@ -202,10 +202,25 @@ fn generate_footer() -> Markup {
         }
     }
 }
+fn group_by_nth<T: Clone>(slice: &[T], n: usize) -> Vec<Vec<T>> {
+    (0..n)
+        .map(|i| {
+            slice
+                .iter()
+                .enumerate()
+                .filter_map(|(index, value)| {
+                    if index % n == i {
+                        Some(value.clone())
+                    } else {
+                        None
+                    }
+                })
+                .collect()
+        })
+        .collect()
+}
 
 fn generate_index(entries: Vec<Entry>) -> Markup {
-    let num_columns = 3;
-    let chunk_size = (entries.len() as f32 / num_columns as f32).ceil() as usize;
     html! {
         (maud::DOCTYPE)
         html {
@@ -219,7 +234,7 @@ fn generate_index(entries: Vec<Entry>) -> Markup {
             body { main class="container" {
                 {(generate_header())}
                 div class="grid" {
-                    @for column_entries in entries.chunks(chunk_size) {
+                    @for column_entries in group_by_nth(&entries, 3) {
                         div {
                             @for entry in column_entries {
                                 {(create_html_card(&entry))}