tweak code markup parser so that blocks without a language are just output in pre tags

lib/gollum/markup.rb

@@ -347,7 +347,7 @@ module Gollum
     #
     # Returns the placeholder'd String data.
     def extract_code(data)
-      data.gsub(/^``` ?(.+?)\r?\n(.+?)\r?\n```\r?$/m) do
+      data.gsub(/^``` ?([^\r\n]+)?\r?\n(.+?)\r?\n```\r?$/m) do
         id = Digest::SHA1.hexdigest($2)
         @codemap[id] = { :lang => $1, :code => $2 }
         id
@@ -362,12 +362,15 @@ module Gollum
     # Returns the marked up String data.
     def process_code(data)
       @codemap.each do |id, spec|
-        lang = spec[:lang]
         code = spec[:code]
         if code.lines.all? { |line| line =~ /\A\r?\n\Z/ || line =~ /^(  |\t)/ }
           code.gsub!(/^(  |\t)/m, '')
         end
+        if lang = spec[:lang]
           data.gsub!(id, Gollum::Albino.new(code, lang).colorize)
+        else
+          data.gsub!(id, "<pre><code>#{CGI.escapeHTML(code)}</code></pre>")
+        end
       end
       data
     end

test/test_markup.rb

@@ -360,8 +360,8 @@ context "Markup" do
   end
 
   test "code block with no lang" do
-    content = "a\n\n```\n\tls -al;\n\tbooya\n```\n\nb"
+    content = "a\n\n```\n\tls -al;\n\t<booya>\n```\n\nb"
-    output = "<p>a</p>\n\n\n\n<p>b</p>"
+    output = "<p>a</p>\n\n<pre><code>ls -al;\n&lt;booya&gt;</code></pre>\n\n<p>b</p>"
     compare(content, output)
   end