FIX: Provide the ability to reduce cooked content

This allows us to strip polls from the group posts page.

app/helpers/user_notifications_helper.rb

@@ -51,7 +51,7 @@ module UserNotificationsHelper
   def email_excerpt(html, posts_count)
     # only include 1st paragraph when more than 1 posts
     html = first_paragraph_from(html).to_s if posts_count > 1
-    raw format_for_email(html)
+    PrettyText.format_for_email(html).html_safe
   end
 
   def normalize_name(name)
@@ -65,8 +65,9 @@ module UserNotificationsHelper
       normalize_name(post.user.name) != normalize_name(post.user.username)
   end
 
-  def format_for_email(html)
-    PrettyText.format_for_email(html).html_safe
+  def format_for_email(post, use_excerpt)
+    html = use_excerpt ? post.excerpt : post.cooked
+    PrettyText.format_for_email(html, post).html_safe
   end
 
 end

app/serializers/group_post_serializer.rb

@@ -31,6 +31,12 @@ class GroupPostSerializer < ApplicationSerializer
     object.topic
   end
 
+  def cooked
+    fragment = Nokogiri::HTML.fragment(object.cooked)
+    DiscourseEvent.trigger(:reduce_cooked, fragment, object)
+    fragment.to_html
+  end
+
   def category
     object.topic.category
   end

app/views/email/_post.html.erb

@@ -23,7 +23,7 @@
       </td>
     </tr>
     <tr>
-      <td class='body'><%= format_for_email(use_excerpt ? post.excerpt :  post.cooked) %></td>
+      <td class='body'><%= format_for_email(post, use_excerpt) %></td>
     </tr>
   </tbody>
 </table>

lib/pretty_text.rb

@@ -390,8 +390,9 @@ module PrettyText
     doc.css(".lightbox-wrapper .meta").remove
   end
 
-  def self.format_for_email(html)
+  def self.format_for_email(html, post = nil)
     doc = Nokogiri::HTML.fragment(html)
+    DiscourseEvent.trigger(:reduce_cooked, doc, post)
     make_all_links_absolute(doc)
     strip_image_wrapping(doc)
     doc.to_html

plugins/poll/plugin.rb

@@ -22,19 +22,6 @@ DEFAULT_POLL_NAME ||= "poll".freeze
 
 after_initialize do
 
-  # turn polls into a link in emails
-  Email::Styles.register_plugin_style do |fragment, opts|
-    post = Post.find_by(id: opts[:post_id]) rescue nil
-    if post.nil? || post.trashed?
-      fragment.css(".poll").each(&:remove)
-    else
-      post_url = "#{Discourse.base_url}#{post.url}"
-      fragment.css(".poll").each do |poll|
-        poll.replace "<p><a href='#{post_url}'>#{I18n.t("poll.email.link_to_poll")}</a></p>"
-      end
-    end
-  end
-
   module ::DiscoursePoll
     class Engine < ::Rails::Engine
       engine_name PLUGIN_NAME
@@ -281,7 +268,7 @@ after_initialize do
             self.errors.add(:base, I18n.t("poll.default_poll_with_multiple_choices_has_invalid_parameters")) :
             self.errors.add(:base, I18n.t("poll.named_poll_with_multiple_choices_has_invalid_parameters", name: poll["name"]))
           return
-         end
+        end
       end
 
       # store the valid poll
@@ -367,6 +354,17 @@ after_initialize do
     user ? [POLLS_CUSTOM_FIELD, VOTES_CUSTOM_FIELD] : [POLLS_CUSTOM_FIELD]
   end
 
+  on(:reduce_cooked) do |fragment, post|
+    if post.nil? || post.trashed?
+      fragment.css(".poll, [data-poll-name]").each(&:remove)
+    else
+      post_url = "#{Discourse.base_url}#{post.url}"
+      fragment.css(".poll, [data-poll-name]").each do |poll|
+        poll.replace "<p><a href='#{post_url}'>#{I18n.t("poll.email.link_to_poll")}</a></p>"
+      end
+    end
+  end
+
   # tells the front-end we have a poll for that post
   on(:post_created) do |post|
     next if post.is_first_post? || post.custom_fields[POLLS_CUSTOM_FIELD].blank?