improved backtick codeblock's handling of the raw option

plugins/backtick_code_block.rb

@@ -5,18 +5,19 @@ module BacktickCodeBlock
   AllOptions = /([^\s]+)\s+(.+?)(https?:\/\/\S+)\s*(.+)?/i
   LangCaption = /([^\s]+)\s*(.+)?/i
   def render_code_block(input)
+    @options = nil
     @caption = nil
     @lang = nil
     @url = nil
     @title = nil
     input.gsub /^`{3} *([^\n]+)?\n(.+?)\n`{3}/m do
-      options = $1
+      @options = $1 || ''
       str = $2
 
-      if options =~ AllOptions
+      if @options =~ AllOptions
         @lang = $1
         @caption = "<figcaption><span>#{$2}</span><a href='#{$3}'>#{$4 || 'link'}</a></figcaption>"
-      elsif options =~ LangCaption
+      elsif @options =~ LangCaption
         @lang = $1
         @caption = "<figcaption><span>#{$2}</span></figcaption>"
       end
@@ -29,7 +30,7 @@ def render_code_block(input)
         "<figure role=code>#{@caption}#{code}</figure>"
       else
         if @lang.include? "-raw"
-          raw = "``` #{@lang.sub('-raw', '')}\n"
+          raw = "``` #{@options.sub('-raw', '')}\n"
           raw += str
           raw += "\n```\n"
         else