From 49a67785dcdfbdeca751ea600f0386080349a8ef Mon Sep 17 00:00:00 2001
From: Brandon Mathis <brandon@imathis.com>
Date: Thu, 28 Jul 2011 15:59:27 -0400
Subject: Add support using github backtick code blocks without supplying a
 language

---
 plugins/octopress_filters.rb | 26 +++++++++++++++++++-------
 1 file changed, 19 insertions(+), 7 deletions(-)

diff --git a/plugins/octopress_filters.rb b/plugins/octopress_filters.rb
index 21c24eed..f2a5073b 100644
--- a/plugins/octopress_filters.rb
+++ b/plugins/octopress_filters.rb
@@ -27,24 +27,36 @@ module OctopressFilters
   # ```
   def backtick_codeblock(input)
     # Markdown support
-    input = input.gsub /<p>`{3}\s(\w+)<\/p>\s*<pre><code>\s*(.+?)\s*<\/code><\/pre>\s*<p>`{3}<\/p>/m do
+    input = input.gsub /<p>`{3}\s*(\w+)?<\/p>\s*<pre><code>\s*(.+?)\s*<\/code><\/pre>\s*<p>`{3}<\/p>/m do
       lang = $1
-      str  = $2.gsub('&lt;','<').gsub('&gt;','>')
-      highlight(str, lang)
+      if lang != ''
+        str  = $2.gsub('&lt;','<').gsub('&gt;','>')
+        highlight(str, lang)
+      else
+        "<pre><code>#{$2}</code></pre>"
+      end
     end
 
     # Textile support
-    input = input.gsub /<p>`{3}\s(\w+)<br\s*\/>\n(.+?)`{3}<\/p>/m do
+    input = input.gsub /<p>`{3}\s*(\w+)?<br\s*\/>\n(.+?)`{3}<\/p>/m do
       lang = $1
       str  = $2.gsub('&lt;','<').gsub('&gt;','>').gsub(/^\s{4}/, '').gsub(/(<br\s\/>)?$/, '')
-      highlight(str, lang)
+      if lang != ''
+        highlight(str, lang)
+      else
+        "<pre><code>#{$2}</code></pre>"
+      end
     end
 
     # Regular HTML support
-    input.gsub /^`{3}\s(\w+)\n(.+?)\n`{3}/m do
+    input.gsub /^`{3}\s*(\w+)?\n(.+?)\n`{3}/m do
       lang = $1
       str  = $2.gsub(/^\s{4}/, '')
-      highlight(str, lang)
+      if lang != ''
+        highlight(str, lang)
+      else
+        "<pre><code>#{$2.gsub('<','&lt;').gsub('>','&gt;')}</code></pre>"
+      end
     end
   end
 
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