diff --git a/app/logical/tag_category.rb b/app/logical/tag_category.rb
index 2ffdb64e9..efd094c1f 100644
--- a/app/logical/tag_category.rb
+++ b/app/logical/tag_category.rb
@@ -1,78 +1,79 @@
-class TagCategory
-  module Mappings
-    # Returns a hash mapping various tag categories to a numerical value.
-    def mapping
-      @@mapping ||= Hash[
-          Danbooru.config.full_tag_config_info.map {|k,v|  v["extra"].map {|y| [y,v["category"]]}}
-          .reduce([],:+)]
-        .update(Hash[Danbooru.config.full_tag_config_info.map {|k,v|  [v["short"],v["category"]]}])
-        .update( Hash[Danbooru.config.full_tag_config_info.map {|k,v| [k,v["category"]]}])
-    end
-
-    # Returns a hash mapping more suited for views
-    def canonical_mapping
-      @@canonical_mapping ||= Hash[Danbooru.config.full_tag_config_info.map {|k,v| [k.capitalize,v["category"]]}]
-    end
-
-    # Returns a hash mapping numerical category values to their string equivalent.
-    def reverse_mapping
-      @@reverse_mapping ||= Hash[Danbooru.config.full_tag_config_info.map {|k,v| [v["category"],k]}]
-    end
-
-    # Returns a hash mapping for the short name usage in metatags
-    def short_name_mapping
-      @@short_name_mapping ||= Hash[Danbooru.config.full_tag_config_info.map {|k,v| [v["short"],k]}]
-    end
-
-    # Returns a hash mapping for split_tag_list_html (presenters/tag_set_presenter.rb)
-    def header_mapping
-      @@header_mapping ||= Hash[Danbooru.config.full_tag_config_info.map {|k,v| [k,v["header"]]}]
-    end
-
-    # Returns a hash mapping for related tag buttons (javascripts/related_tag.js.erb)
-    def related_button_mapping
-      @@related_button_mapping ||= Hash[Danbooru.config.full_tag_config_info.map {|k,v| [k,v["relatedbutton"]]}]
-    end
-
-    # Returns a hash mapping for CSS (stylesheets/posts.scss.erb)
-    def css_mapping
-      @@css_mapping ||= Hash[Danbooru.config.full_tag_config_info.map {|k,v| [v["category"],v["css"]]}]
-    end
-  end
-
-  module Lists
-    def categories
-      @@categories ||= Danbooru.config.full_tag_config_info.keys
-    end
-
-    def category_ids
-      @@category_ids ||= canonical_mapping.values
-    end
-
-    def short_name_list
-      @@short_name_list ||= short_name_mapping.keys
-    end
-
-    def split_header_list
-      Danbooru.config.split_tag_header_list
-    end
-
-    def categorized_list
-      Danbooru.config.categorized_tag_list
-    end
-
-    def related_button_list
-      Danbooru.config.related_tag_button_list
-    end
-  end
-
-  module Regexes
-    def short_name_regex
-      @@short_name_regex ||= short_name_list.join("|")
-    end
-  end
-
-  extend Mappings
-  extend Lists
-  extend Regexes
-end
+class TagCategory
+  module Mappings
+    # Returns a hash mapping various tag categories to a numerical value.
+    def mapping
+      @@mapping ||=
+        Hash[
+          Danbooru.config.full_tag_config_info.map { |k, v| v["extra"].map { |y| [y, v["category"]] }}.reduce([], :+)
+        ]
+        .update(Hash[Danbooru.config.full_tag_config_info.map { |k, v| [v["short"], v["category"]] }])
+        .update(Hash[Danbooru.config.full_tag_config_info.map { |k, v| [k, v["category"]] }])
+    end
+
+    # Returns a hash mapping more suited for views
+    def canonical_mapping
+      @@canonical_mapping ||= Hash[Danbooru.config.full_tag_config_info.map { |k, v| [k.capitalize, v["category"]] }]
+    end
+
+    # Returns a hash mapping numerical category values to their string equivalent.
+    def reverse_mapping
+      @@reverse_mapping ||= Hash[Danbooru.config.full_tag_config_info.map { |k, v| [v["category"], k] }]
+    end
+
+    # Returns a hash mapping for the short name usage in metatags
+    def short_name_mapping
+      @@short_name_mapping ||= Hash[Danbooru.config.full_tag_config_info.map { |k, v| [v["short"], k] }]
+    end
+
+    # Returns a hash mapping for split_tag_list_html (presenters/tag_set_presenter.rb)
+    def header_mapping
+      @@header_mapping ||= Hash[Danbooru.config.full_tag_config_info.map { |k, v| [k, v["header"]] }]
+    end
+
+    # Returns a hash mapping for related tag buttons (javascripts/related_tag.js.erb)
+    def related_button_mapping
+      @@related_button_mapping ||= Hash[Danbooru.config.full_tag_config_info.map { |k, v| [k, v["relatedbutton"]] }]
+    end
+
+    # Returns a hash mapping for CSS (stylesheets/posts.scss.erb)
+    def css_mapping
+      @@css_mapping ||= Hash[Danbooru.config.full_tag_config_info.map { |k, v| [v["category"], v["css"]] }]
+    end
+  end
+
+  module Lists
+    def categories
+      @@categories ||= Danbooru.config.full_tag_config_info.keys
+    end
+
+    def category_ids
+      @@category_ids ||= canonical_mapping.values
+    end
+
+    def short_name_list
+      @@short_name_list ||= short_name_mapping.keys
+    end
+
+    def split_header_list
+      Danbooru.config.split_tag_header_list
+    end
+
+    def categorized_list
+      Danbooru.config.categorized_tag_list
+    end
+
+    def related_button_list
+      Danbooru.config.related_tag_button_list
+    end
+  end
+
+  module Regexes
+    def short_name_regex
+      @@short_name_regex ||= short_name_list.join("|")
+    end
+  end
+
+  extend Mappings
+  extend Lists
+  extend Regexes
+end