plugins/backtick_code_block.rb
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 require './plugins/pygments_code'
 
 module BacktickCodeBlock
   include HighlightCode
   AllOptions = /([^\s]+)\s+(.+?)(https?:\/\/\S+)\s*(.+)?/i
   LangCaption = /([^\s]+)\s*(.+)?/i
   def render_code_block(input)
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     @options = nil
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     @caption = nil
     @lang = nil
     @url = nil
     @title = nil
     input.gsub /^`{3} *([^\n]+)?\n(.+?)\n`{3}/m do
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       @options = $1 || ''
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       str = $2
 
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       if @options =~ AllOptions
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         @lang = $1
         @caption = "<figcaption><span>#{$2}</span><a href='#{$3}'>#{$4 || 'link'}</a></figcaption>"
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       elsif @options =~ LangCaption
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         @lang = $1
         @caption = "<figcaption><span>#{$2}</span></figcaption>"
       end
 
       if str.match(/\A {4}/)
         str = str.gsub /^ {4}/, ''
       end
       if @lang.nil? || @lang == 'plain'
         code = tableize_code(str.gsub('<','&lt;').gsub('>','&gt;'))
         "<figure role=code>#{@caption}#{code}</figure>"
       else
         if @lang.include? "-raw"
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           raw = "``` #{@options.sub('-raw', '')}\n"
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           raw += str
           raw += "\n```\n"
         else
           code = highlight(str, @lang)
           "<figure role=code>#{@caption}#{code}</figure>"
         end
       end
     end
   end
 end