Unpack search items that are embedded in categories

This is a squash of a bunch of commits
cherry-picked commits

Fix category parse error on search

(cherry picked from commit cc02fed4e6)

Fix category items not being extracted in search

(cherry picked from commit 2605b9c609)

Make search not include category items for now

(cherry picked from commit ca4afd59f4)

Change behavior of categories in search results

(cherry picked from commit cc10675610)

Fix missing search results in extraction

(cherry picked from commit abda6840d5)

Fix miscount of search results

(cherry picked from commit 491e33450e)

src/invidious/helpers/extractors.cr

@@ -253,8 +253,8 @@ private class CategoryParser < ItemParser
 
     # Content could be in three locations.
     if content_container = item_contents["content"]["horizontalListRenderer"]?
-    elsif content_container = item_contents["content"]["expandedShelfContentsRenderer"]
-    elsif content_container = item_contents["content"]["verticalListRenderer"]
+    elsif content_container = item_contents["content"]["expandedShelfContentsRenderer"]?
+    elsif content_container = item_contents["content"]["verticalListRenderer"]?
     else
       content_container = item_contents["contents"]
     end
@@ -332,10 +332,15 @@ private class SearchResultsExtractor < ItemsContainerExtractor
   end
 
   private def extract(target)
-    raw_items = [] of JSON::Any
+    raw_items = [] of Array(JSON::Any)
     content = target["primaryContents"]
-    renderer = content["sectionListRenderer"]["contents"].as_a[0]["itemSectionRenderer"]
-    raw_items = renderer["contents"].as_a
+    renderer = content["sectionListRenderer"]["contents"].as_a.each do |node|
+      if node = node["itemSectionRenderer"]?
+        raw_items << node["contents"].as_a
+      end
+    end
+
+    raw_items = raw_items.flatten
 
     return raw_items
   end

src/invidious/search.cr

@@ -232,5 +232,20 @@ def process_search_query(query, page, user, region)
     count, items = search(search_query, search_params, region).as(Tuple)
   end
 
-  {search_query, count, items, operators}
+  # Light processing to flatten search results out of Categories.
+  # They should ideally be supported in the future.
+  items_without_cate_items = [] of SearchItem | ChannelVideo
+  items.each do |i|
+    if i.is_a? Category
+      i.contents.each do |nest_i|
+        if !nest_i.is_a? Video
+          items_without_cate_items << nest_i
+        end
+      end
+    else
+      items_without_cate_items << i
+    end
+  end
+
+  {search_query, items_without_cate_items.size, items_without_cate_items, url_params}
 end