reverted post version tag change for danbooru2

app/helpers/application_helper.rb

@@ -27,7 +27,7 @@ module ApplicationHelper
     zone = time.strftime("%z")
     datetime = time.strftime("%Y-%m-%dT%H:%M" + zone[0, 3] + ":" + zone[3, 2])
     
-    content_tag(:time, content || datetime, :datetime => datetime)
+    content_tag(:time, content || datetime, :datetime => datetime, :title => time.to_formatted_s)
   end
   
   def compact_time(time)

app/helpers/post_versions_helper.rb

@@ -1,2 +1,16 @@
 module PostVersionsHelper
+  def post_version_diff(post_version)
+    diff = post_version.diff(post_version.previous)
+    html = []
+    diff[:added_tags].each do |tag|
+      html << '<ins>' + tag + '</ins>'
+    end
+    diff[:removed_tags].each do |tag|
+      html << '<del>' + tag + '</del>'
+    end
+    diff[:unchanged_tags].each do |tag|
+      html << '<span>' + tag + '</span>' unless tag =~ /^(?:rating|source):/
+    end
+    return html.join(" ").html_safe
+  end
 end