Switch to Redcarpet for Markdown Rendering.

This gives us Github Flavored Markdown, which is awesome.

Gemfile

@@ -18,12 +18,12 @@ gem "six"
 gem "therubyracer"
 gem "faker"
 gem "seed-fu"
-gem "pygments.rb", "0.2.7"
+gem "pygments.rb", "~> 0.2.11"
+gem "redcarpet", "~> 2.1.1"
 gem "thin"
 gem "unicorn"
 gem "git"
 gem "acts_as_list"
-gem "rdiscount"
 gem "acts-as-taggable-on", "~> 2.1.0"
 gem "drapper"
 gem "resque", "~> 1.20.0"

Gemfile.lock

@@ -169,7 +169,7 @@ GEM
       coderay (~> 1.0.5)
       method_source (~> 0.7)
       slop (>= 2.4.4, < 3)
-    pygments.rb (0.2.7)
+    pygments.rb (0.2.11)
       rubypython (~> 0.5.3)
     pyu-ruby-sasl (0.0.3.3)
     rack (1.4.1)
@@ -200,9 +200,9 @@ GEM
       thor (~> 0.14.6)
     raindrops (0.8.0)
     rake (0.9.2.2)
-    rdiscount (1.6.8)
     rdoc (3.12)
       json (~> 1.4)
+    redcarpet (2.1.1)
     redis (2.2.2)
     redis-namespace (1.0.3)
       redis (< 3.0.0)
@@ -330,11 +330,11 @@ DEPENDENCIES
   mysql2
   omniauth-ldap
   pry
-  pygments.rb (= 0.2.7)
+  pygments.rb (~> 0.2.11)
   rails (= 3.2.1)
   rails-footnotes
   rake
-  rdiscount
+  redcarpet (~> 2.1.1)
   resque (~> 1.20.0)
   rspec-rails
   sass-rails (= 3.2.3)

app/assets/stylesheets/highlight.scss

@@ -22,7 +22,7 @@ td.linenos{
   vertical-align:top;
 }
 
-.highlight{
+.highlighttable .highlight{
   background:none;
   padding:10px 0px 0px 10px;
   margin-left:0px;
@@ -31,7 +31,7 @@ td.linenos{
 }
 
 .linenodiv pre,
-.highlight pre{
+.highlighttable .highlight pre{
   margin:0;
   padding:0;
   background:none;

app/helpers/application_helper.rb

@@ -72,7 +72,18 @@ module ApplicationHelper
   end
 
   def markdown(text)
-    RDiscount.new(text, :autolink, :no_pseudo_protocols, :safelink, :smart, :filter_html).to_html.html_safe
+    @__renderer ||= Redcarpet::Markdown.new(Redcarpet::Render::GitlabHTML.new(filter_html: true), {
+      no_intra_emphasis: true,
+      tables: true,
+      fenced_code_blocks: true,
+      autolink: true,
+      strikethrough: true,
+      lax_html_blocks: true,
+      space_after_headers: true,
+      superscript: true
+    })
+
+    @__renderer.render(text).html_safe
   end
 
   def search_autocomplete_source

app/helpers/wikis_helper.rb

@@ -1,5 +1,2 @@
 module WikisHelper
-  def markdown_to_html(text)
-    RDiscount.new(text).to_html.html_safe
-  end
 end

app/views/wikis/show.html.haml

@@ -9,7 +9,7 @@
 %hr
 .wiki_content
   = preserve do
-    = markdown_to_html @wiki.content
+    = markdown @wiki.content
 
 %p.time Last edited by #{@wiki.user.name}, in #{time_ago_in_words @wiki.created_at}
 - if can? current_user, :admin_wiki, @project

lib/redcarpet/render/gitlab_html.rb

@@ -0,0 +1,9 @@
+class Redcarpet::Render::GitlabHTML < Redcarpet::Render::HTML
+  def block_code(code, language)
+    if Pygments::Lexer.find(language)
+      Pygments.highlight(code, :lexer => language)
+    else
+      Pygments.highlight(code)
+    end
+  end
+end