Old plugin to get line numbers and code highlighting available on Jekyll <= 0.12

old_redcarpet_pygments.rb

require 'redcarpet'
require 'pygments'

# Provides a custom Redcarpet renderer with some tweaks for code blocks and links.
class HTMLwithPygmentsCodeblocks < Redcarpet::Render::HTML
  def initialize(extensions = {})
      super extensions.merge(:link_attributes => { :target => "_blank" }) # Open link in new window
    end
    
  def block_code(code, language)
    colorized = Pygments.highlight(code, :lexer => language, :options => {:lineanchors => "line"}) # Add lineanchors for line numbers
    colorized.sub(/<pre>/, "<pre><code class=\"#{language}\">").sub(/<\/pre>/, "</code></pre>")
  end
  
  def codespan(code)
    "<code class=\"inline-code\">#{code}</code>" # Inline code custom class
  end 
end

class Jekyll::MarkdownConverter
  def extensions
    Hash[ *@config['redcarpet']['extensions'].map {|e| [e.to_sym, true] }.flatten ]
  end

  def markdown
    @markdown ||= Redcarpet::Markdown.new(HTMLwithPygmentsCodeblocks, :fenced_code_blocks => true)
  end

  def convert(content)
    return super unless @config['markdown'] == 'redcarpet-pygments'
    markdown.render(content)
  end
end

You can find more info and new version for Jekyll v1 on this article.

You can find more info and new version for Jekyll v1 on this article.

The class=\"#{language}\" part conflicts with Pygments files for some short-name languages (such as C or D). I've fixed it by changing the class to language-#{language}, and setting the language to "unknown" just before this if it is not known:

language = 'unknown' if language.nil?
colorized.sub(/<pre>/, "<pre><code class=\"language-#{language}\">").sub(/<\/pre>/, "</code></pre>")

The first line is optional, and added for neatness (if omitted, unknown languages will have the class language-).

The class=\"#{language}\" part conflicts with Pygments files for some short-name languages (such as C or D). I've fixed it by changing the class to language-#{language}, and setting the language to "unknown" just before this if it is not known:

language = 'unknown' if language.nil?
colorized.sub(/<pre>/, "<pre><code class=\"language-#{language}\">").sub(/<\/pre>/, "</code></pre>")

The first line is optional, and added for neatness (if omitted, unknown languages will have the class language-).