add syntax highlighting

app/helpers/post_helper.rb

@@ -15,6 +15,6 @@ def post_summary_html(post)
   end
 
   def post_content_html(post)
-    RDiscount.new(render(:inline => post.content)).to_html.html_safe
+    MarkdownService.new.render(post.content).html_safe
   end
 end

app/models/markdown_service.rb

@@ -0,0 +1,15 @@
+require 'rouge/plugins/redcarpet'
+
+class MarkdownService
+  class HTMLWithRouge < Redcarpet::Render::HTML
+    include Rouge::Plugins::Redcarpet # yep, that's it.
+  end
+
+  def initialize
+    @markdown = ::Redcarpet::Markdown.new(HTMLWithRouge, :fenced_code_blocks => true)
+  end
+
+  def render(text)
+    @markdown.render(text)
+  end
+end

lib/postmarkdown/engine.rb

@@ -2,7 +2,8 @@ module Postmarkdown
   require 'postmarkdown'
   require 'rails'
   require 'gravtastic'
-  require 'rdiscount'
+  require 'redcarpet'
+  require 'rouge'
   require 'nokogiri'
   require 'action_view'
   require 'haml'

postmarkdown.gemspec

@@ -25,8 +25,9 @@ Gem::Specification.new do |s|
   s.add_dependency 'haml', ['>= 3.1', '< 5']
   s.add_dependency 'gravtastic'
   s.add_dependency 'nokogiri'
-  s.add_dependency 'rdiscount'
+  s.add_dependency 'redcarpet'
   s.add_dependency 'kaminari'
+  s.add_dependency 'rouge'
 
   s.add_development_dependency 'appraisal'
   s.add_development_dependency 'rspec-rails', '~> 2.8'

vendor/assets/stylesheets/github.css

@@ -0,0 +1,61 @@
+.hll { background-color: #ffffcc }
+.c { color: #999988; font-style: italic } /* Comment */
+.err { color: #a61717; background-color: #e3d2d2 } /* Error */
+.k { color: #000000; font-weight: normal } /* Keyword */
+.o { color: #000000; font-weight: normal } /* Operator */
+.cm { color: #999988; font-style: italic } /* Comment.Multiline */
+.cp { color: #999999; font-weight: normal; font-style: italic } /* Comment.Preproc */
+.c1 { color: #999988; font-style: italic } /* Comment.Single */
+.cs { color: #999999; font-weight: normal; font-style: italic } /* Comment.Special */
+.gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */
+.ge { color: #000000; font-style: italic } /* Generic.Emph */
+.gr { color: #aa0000 } /* Generic.Error */
+.gh { color: #999999 } /* Generic.Heading */
+.gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */
+.go { color: #888888 } /* Generic.Output */
+.gp { color: #555555 } /* Generic.Prompt */
+.gs { font-weight: normal } /* Generic.Strong */
+.gu { color: #aaaaaa } /* Generic.Subheading */
+.gt { color: #aa0000 } /* Generic.Traceback */
+.kc { color: #000000; font-weight: normal } /* Keyword.Constant */
+.kd { color: #000000; font-weight: normal } /* Keyword.Declaration */
+.kn { color: #000000; font-weight: normal } /* Keyword.Namespace */
+.kp { color: #000000; font-weight: normal } /* Keyword.Pseudo */
+.kr { color: #000000; font-weight: normal } /* Keyword.Reserved */
+.kt { color: #445588; font-weight: normal } /* Keyword.Type */
+.m { color: #009999 } /* Literal.Number */
+.s { color: #d01040 } /* Literal.String */
+.na { color: #008080 } /* Name.Attribute */
+.nb { color: #0086B3 } /* Name.Builtin */
+.nc { color: #445588; font-weight: normal } /* Name.Class */
+.no { color: #008080 } /* Name.Constant */
+.nd { color: #3c5d5d; font-weight: normal } /* Name.Decorator */
+.ni { color: #800080 } /* Name.Entity */
+.ne { color: #990000; font-weight: normal } /* Name.Exception */
+.nf { color: #990000; font-weight: normal } /* Name.Function */
+.nl { color: #990000; font-weight: normal } /* Name.Label */
+.nn { color: #555555 } /* Name.Namespace */
+.nt { color: #000080 } /* Name.Tag */
+.nv { color: #008080 } /* Name.Variable */
+.ow { color: #000000; font-weight: normal } /* Operator.Word */
+.w { color: #bbbbbb } /* Text.Whitespace */
+.mf { color: #009999 } /* Literal.Number.Float */
+.mh { color: #009999 } /* Literal.Number.Hex */
+.mi { color: #009999 } /* Literal.Number.Integer */
+.mo { color: #009999 } /* Literal.Number.Oct */
+.sb { color: #d01040 } /* Literal.String.Backtick */
+.sc { color: #d01040 } /* Literal.String.Char */
+.sd { color: #d01040 } /* Literal.String.Doc */
+.s2 { color: #d01040 } /* Literal.String.Double */
+.se { color: #d01040 } /* Literal.String.Escape */
+.sh { color: #d01040 } /* Literal.String.Heredoc */
+.si { color: #d01040 } /* Literal.String.Interpol */
+.sx { color: #d01040 } /* Literal.String.Other */
+.sr { color: #009926 } /* Literal.String.Regex */
+.s1 { color: #d01040 } /* Literal.String.Single */
+.ss { color: #990073 } /* Literal.String.Symbol */
+.bp { color: #999999 } /* Name.Builtin.Pseudo */
+.vc { color: #008080 } /* Name.Variable.Class */
+.vg { color: #008080 } /* Name.Variable.Global */
+.vi { color: #008080 } /* Name.Variable.Instance */
+.il { color: #009999 } /* Literal.Number.Integer.Long */