extractors: Add support for richGridRenderer

src/invidious/yt_backend/extractors.cr

@@ -436,7 +436,18 @@ private module Extractors
       content = extract_selected_tab(target["tabs"])["content"]
 
       if section_list_contents = content.dig?("sectionListRenderer", "contents")
-        section_list_contents.as_a.each do |renderer_container|
+        raw_items = unpack_section_list(section_list_contents)
+      elsif rich_grid_contents = content.dig?("richGridRenderer", "contents")
+        raw_items = rich_grid_contents.as_a
+      end
+
+      return raw_items
+    end
+
+    private def self.unpack_section_list(contents)
+      raw_items = [] of JSON::Any
+
+      contents.as_a.each do |renderer_container|
         renderer_container_contents = renderer_container["itemSectionRenderer"]["contents"][0]
 
         # Category extraction
@@ -452,7 +463,6 @@ private module Extractors
           raw_items << item
         end
       end
-      end
 
       return raw_items
     end
@@ -525,14 +535,11 @@ private module Extractors
     end
 
     private def self.extract(target)
-      raw_items = [] of JSON::Any
-      if content = target["gridContinuation"]?
-        raw_items = content["items"].as_a
-      elsif content = target["continuationItems"]?
-        raw_items = content.as_a
-      end
+      content = target["continuationItems"]?
+      content ||= target.dig?("gridContinuation", "items")
+      content ||= target.dig?("richGridContinuation", "contents")
 
-      return raw_items
+      return content.nil? ? [] of JSON::Any : content.as_a
     end
 
     def self.extractor_name