FEATURE: Use configured quotation marks in fancy topic title

app/models/site_setting.rb

@@ -3,6 +3,7 @@
 require 'site_setting_extension'
 require_dependency 'global_path'
 require_dependency 'site_settings/yaml_loader'
+require 'htmlentities'
 
 class SiteSetting < ActiveRecord::Base
   extend GlobalPath
@@ -122,6 +123,7 @@ class SiteSetting < ActiveRecord::Base
     @attachment_content_type_blacklist_regex = nil
     @attachment_filename_blacklist_regex = nil
     @unicode_username_whitelist_regex = nil
+    @pretty_quote_entities = nil
   end
 
   def self.attachment_content_type_blacklist_regex
@@ -137,6 +139,22 @@ class SiteSetting < ActiveRecord::Base
       ? Regexp.new(SiteSetting.unicode_username_character_whitelist) : nil
   end
 
+  def self.pretty_quote_entities
+    @pretty_quote_entities ||= begin
+      htmlentities = HTMLEntities.new
+      quotation_marks = SiteSetting.markdown_typographer_quotation_marks
+        .split("|")
+        .map { |quote| htmlentities.encode(quote, :basic, :named, :decimal) }
+
+      {
+        double_left_quote: quotation_marks[0],
+        double_right_quote: quotation_marks[1],
+        single_left_quote: quotation_marks[2],
+        single_right_quote: quotation_marks[3]
+      }
+    end
+  end
+
   # helpers for getting s3 settings that fallback to global
   class Upload
     def self.s3_cdn_url

app/models/topic.rb

@@ -336,7 +336,7 @@ class Topic < ActiveRecord::Base
 
   def self.fancy_title(title)
     return unless escaped = ERB::Util.html_escape(title)
-    fancy_title = Emoji.unicode_unescape(HtmlPrettify.render(escaped))
+    fancy_title = Emoji.unicode_unescape(HtmlPrettify.render(escaped, SiteSetting.pretty_quote_entities))
     fancy_title.length > Topic.max_fancy_title_length ? escaped : fancy_title
   end
 

lib/html_prettify.rb

@@ -10,8 +10,8 @@
 #
 
 class HtmlPrettify < String
-  def self.render(html)
-    new(html).to_html
+  def self.render(html, entities = {})
+    new(html, [2], entities).to_html
   end
 
   # Create a new RubyPants instance with the text in +string+.

lib/tasks/topics.rake

@@ -83,6 +83,25 @@ task "topics:watch_all_replied_topics" => :environment do
   puts "", "Done"
 end
 
+task "topics:update_fancy_titles" => :environment do
+  if !SiteSetting.title_fancy_entities?
+    puts "fancy topic titles are disabled"
+    return
+  end
+
+  DB.exec("UPDATE topics SET fancy_title = NULL")
+
+  total = Topic.count
+  count = 0
+
+  Topic.find_each do |topic|
+    topic.fancy_title
+    print_status(count += 1, total)
+  end
+
+  puts "", "Done"
+end
+
 def print_status(current, max)
   print "\r%9d / %d (%5.1f%%)" % [current, max, ((current.to_f / max.to_f) * 100).round(1)]
 end

spec/models/topic_spec.rb

@@ -390,6 +390,16 @@ describe Topic do
         expect(topic.fancy_title).to eq(long_title)
       end
 
+      it "uses the configured quote entities" do
+        SiteSetting.markdown_typographer_quotation_marks = "„|“|‚|‘"
+        topic.title = %q|"Weißt du", sagte er, "was 'Discourse' ist?"|
+        expect(topic.fancy_title).to eq('„Weißt du“, sagte er, „was ‚Discourse‘ ist?“')
+
+        SiteSetting.markdown_typographer_quotation_marks = "«\u00A0|\u00A0»|‹\u00A0|\u00A0›"
+        topic.title = '"Qui vivra verra"'
+        expect(topic.fancy_title).to eq('« Qui vivra verra »')
+      end
+
       context 'readonly mode' do
         before do
           Discourse.enable_readonly_mode