Group Recently Added by neighbouring Title

src/library.cr

@@ -525,15 +525,44 @@ class Library
     titles.each do |t|
       t.entries.each { |e| entries << e }
     end
-    recently_added = entries.map { |e|
+    entries.sort! { |a, b| b.date_added <=> a.date_added }
-      {
+    # Only grab entries form the last 3 months
-        entry: e,
+    # otherwise we will be grouping neighbours by Title for the entire
-        percentage: e.book.load_percentage(username, e.title)
+    # library every time. Is this premature optimisation or reasonable optimisation?
+    entries.select! { |e| e.date_added > 3.months.ago }
+
+    i = 0
+    recently_added = [] of NamedTuple(entry: Entry, percentage: Float64, grouped_count: Int32)
+    while i <= entries.size - 1
+      grouped_count = neighbouring_title_count(entries, i)
+      if grouped_count > 1
+        # delete grouped entries (except for first)
+        entries.delete_at(i+1..i+grouped_count-1)
+      end
+      recently_added << { 
+        entry: entries[i], 
+        percentage: entries[i].book.load_percentage(username, entries[i].title),
+        grouped_count: grouped_count
       }
-    }
+      i += 1
-    recently_added.sort! { |a, b| b[:entry].date_added <=> a[:entry].date_added }[0..11]
     end
 
+    recently_added[0..11]
+  end
+
+  private def neighbouring_title_count(entries, index : Int32)
+    count = 1
+    book_title = entries[index].book.title
+    while index < entries.size - 1
+      if book_title == entries[index+1].book.title # is it ok to compare via book.title?
+        count += 1
+      else
+        break
+      end
+      index += 1
+    end
+    count
+  end
   
   private def get_continue_reading_entry(username, title)
     in_progress_entries = title.entries.select do |e|

src/views/home.ecr

@@ -24,7 +24,8 @@
 <h2 class="uk-title home-headings">Recently Added</h2>
 <div id="item-container-continue" class="uk-child-width-1-4@m uk-child-width-1-2" uk-grid>
   <%- recently_added.each do |ra| -%>
-  <div class="item" data-mtime="<%= ra[:entry].mtime.to_unix %>" data-progress="<%= ra[:percentage] %>" id="<%= ra[:entry].id %>">
+    <%- if ra[:grouped_count] == 1 -%>
+    <div class="item" data-progress="<%= ra[:percentage] %>" id="<%= ra[:entry].id %>">
       <a class="acard">
         <div class="uk-card uk-card-default" onclick="showModal(&quot;<%= ra[:entry].encoded_path %>&quot;, '<%= ra[:entry].pages %>', <%= (ra[:percentage] * 100).round(1) %>, &quot;<%= ra[:entry].book.encoded_display_name %>&quot;, &quot;<%= ra[:entry].encoded_display_name %>&quot;, '<%= ra[:entry].title_id %>', '<%= ra[:entry].id %>')">
           <div class="uk-card-media-top">
@@ -38,6 +39,21 @@
         </div>
       </a>
     </div>
+    <%- else -%>
+    <div class="item">
+      <a class="acard" href="/book/<%= ra[:entry].book.id %>">
+        <div class="uk-card uk-card-default">
+          <div class="uk-card-media-top">
+            <img data-src="<%= ra[:entry].cover_url %>" data-width data-height alt="" uk-img>
+          </div>
+          <div class="uk-card-body">
+            <h3 class="uk-card-title break-word" data-title="<%= ra[:entry].book.display_name.gsub("\"", "&quot;") %>"><%= ra[:entry].book.display_name %></h3>
+            <p><%= ra[:grouped_count] %> new entries</p>
+          </div>
+        </div>
+      </a>
+    </div>
+    <%- end -%>
   <%- end -%>
 </div>
 <%- end -%>