JRuby class for using pegdown as the Rails Markdown processor.

application_helper.rb

require 'markdown'

module ApplicationHelper
  def markdown(text)
    if text.present?
      Markdown.new(text).to_html
    else
      text
    end
  end
end

markdown.rb

require 'parboiled4j-0.9.8.2'
require 'pegdown-0.8.5.3'

class Markdown
  def initialize(text)
    @text = text
    @processor = Java::OrgPegdown::PegDownProcessor.new(Java::OrgPegdown::Extensions::AUTOLINKS | Java::OrgPegdown::Extensions::HARDWRAPS)
  end

  def to_html
    @processor.markdownToHtml(@text)
  end
end