added humanized tag strings

app/models/post.rb

@@ -455,8 +455,32 @@ class Post < ActiveRecord::Base
       tag_string =~ /(?:^| )#{tag}(?:$| )/
     end
     
+    def tag_categories
+      @tag_categories ||= Tag.categories_for(tag_array)
+    end
+    
+    def copyright_tags
+      typed_tags("copyright")
+    end
+    
+    def character_tags
+      typed_tags("character")
+    end
+    
+    def artist_tags
+      typed_tags("artist")
+    end
+    
+    def typed_tags(name)
+      @typed_tags ||= {}
+      @typed_tags[name] ||= begin
+        tag_array.select do |tag|
+          tag_categories[tag] == Danbooru.config.tag_category_mapping[name]
+        end
+      end
+    end
+    
     def essential_tag_string
-      tag_categories = Tag.categories_for(tag_array)
       tag_array.each do |tag|
         if tag_categories[tag] == Danbooru.config.tag_category_mapping["copyright"]
           return tag
@@ -852,6 +876,9 @@ class Post < ActiveRecord::Base
   def reload(options = nil)
     super
     reset_tag_array_cache
+    @tag_categories = nil
+    @typed_tags = nil
+    self
   end
 end
 

app/presenters/post_presenter.rb

@@ -27,6 +27,30 @@ class PostPresenter < Presenter
     PostPresenter.preview(@post)
   end
   
+  def humanized_tag_string
+    @post.tag_string.split(/ /).join(", ").tr("_", " ")
+  end
+  
+  def humanized_essential_tag_string
+    string = []
+    
+    if @post.character_tags.any?
+      string << @post.character_tags.slice(0, 5).to_sentence
+    end
+    
+    if @post.copyright_tags.any?
+      string << "from"
+      string << @post.copyright_tags.slice(0, 5).to_sentence
+    end
+    
+    if @post.artist_tags.any?
+      string << "by"
+      string << @post.artist_tags.to_sentence
+    end
+    
+    string.join(" ").tr("_", " ")
+  end
+  
   def image_html(template)
     return template.content_tag("p", "This image was deleted.") if @post.is_deleted? && !CurrentUser.user.is_janitor?
     return template.content_tag("p", "You need a privileged account to see this image.") if !Danbooru.config.can_user_see_post?(CurrentUser.user, @post)

app/views/posts/show.html.erb

@@ -92,8 +92,8 @@
   <meta name="post-is-deleted" content="<%= @post.is_deleted? %>">
   <meta name="post-is-flagged" content="<%= @post.is_flagged? %>">
   <meta name="config-large-width" content="<%= Danbooru.config.large_image_width %>">
-  <meta property="og:title" content="Check out this image on <%= Danbooru.config.app_name %>: <%= @post.essential_tag_string %>">
+  <meta property="og:title" content="<%= @post.presenter.humanized_essential_tag_string %> - <%= Danbooru.config.app_name %>">
-  <meta property="og:description" content="Check out this image on <%= Danbooru.config.app_name %>: <%= @post.essential_tag_string %>">
+  <meta property="og:description" content="<%= @post.presenter.humanized_tag_string %> - <%= Danbooru.config.app_name %>">
   <meta property="og:image" content="<%= @post.preview_file_url %>">
 <% end %>