added support for pygments.rb removing dependency on pygments, added support for caching highlighted code from pygments.rb and added default line numbering. Javascript auto line numbering now only occurs for embedded gists

plugins/pygments_code.rb

@@ -0,0 +1,34 @@
+require 'pygments'
+require 'fileutils'
+require 'digest/md5'
+
+PYGMENTS_CACHE_DIR = File.expand_path('../../_code_cache', __FILE__)
+FileUtils.mkdir_p(PYGMENTS_CACHE_DIR)
+
+module HighlightCode
+  def highlight(str, lang)
+    str = pygments(str, lang).match(/<pre>(.+)<\/pre>/m)[1].to_s.gsub(/\s*$/, '') #strip out divs <div class="highlight">
+    table = '<div class="highlight"><table cellpadding="0" cellspacing="0"><tr><td class="gutter"><pre class="line-numbers">'
+    code = ''
+    str.lines.each_with_index do |line,index|
+      table += "<span class='line'>#{index+1}</span>\n"
+      code  += "<div class='line'>#{line}</div>"
+    end
+    table += "</pre></td><td class='code' width='100%'><pre><code class='#{lang}'>#{code}</code></pre></td></tr></table></div>"
+  end
+
+  def pygments(code, lang)
+    if defined?(PYGMENTS_CACHE_DIR)
+      path = File.join(PYGMENTS_CACHE_DIR, "#{lang}-#{Digest::MD5.hexdigest(code)}.html")
+      if File.exist?(path)
+        highlighted_code = File.read(path)
+      else
+        highlighted_code = Pygments.highlight(code, :lexer => lang, :formatter => 'html')
+        File.open(path, 'w') {|f| f.print(highlighted_code) }
+      end
+    else
+      highlighted_code = Pygments.highlight(code, :lexer => lang, :formatter => 'html')
+    end
+    highlighted_code
+  end
+end