github-flavored-markdown.rb

#!/usr/bin/env ruby
#  @author Aaron Lampros
#
#  Github-flavored markdown to HTML, in a command-line util.
#
#  $ cat README.md | ./github-flavored-markdown.rb
#
#  Notes:
#  You will need to install Pygments for syntax coloring
#  ```bash
#    $ sudo easy_install pygments
#  ```
#
#  Install the gems `redcarpet` and `Pygments`
#
#
require 'rubygems'
require 'redcarpet'
require 'pathname'
require 'pygments.rb'
require 'rexml/document'

class HTMLwithPygments < Redcarpet::Render::XHTML
  def doc_header()
    ghf_css_path = File.join File.dirname(Pathname.new(__FILE__).realpath), 'ghf_marked.css'
    #	puts Pygments.styles()
    # monokai
    # manni
    # perldoc
    # borland
    # colorful
    # default
    # murphy
    # vs
    # trac
    # tango
    # fruity
    # autumn
    # bw
    # emacs
    # vim
    # pastie
    # friendly
    # native
    # 	'<style>' + Pygments.css('.highlight',:style => 'vs') + '</style>'
    if UNSTYLED
      '<div class="md"><article>'
    else
      '<style>' + File.read(ghf_css_path) + '</style><div class="md"><article>'
    end
  end

  def doc_footer
    '</article></div>'
  end

  def block_code(code, language)
    Pygments.highlight(code, :lexer => language, :options => {:encoding => 'utf-8'})
  end

  def header(title, level, anchor=nil)
    @headers ||= []

    title_elements = REXML::Document.new(title)
    flattened_title = title_elements.inject('') do |flattened, element|
      flattened +=  if element.respond_to?(:text)
                      element.text
                    else
                      element.to_s
                    end
    end
    permalink = flattened_title.downcase.gsub(/[^a-z\s]/, '').gsub(/\W+/, "-")

    # for extra credit: implement this as its own method
    if @headers.include?(permalink)
      permalink += "_1"
      # my brain hurts
      loop do
        break if !@headers.include?(permalink)
        # generate titles like foo-bar_1, foo-bar_2
        permalink.gsub!(/\_(\d+)$/, "_#{$1.to_i + 1}")
      end
    end
    @headers << permalink
    %(\n<h#{level}><a name="#{permalink}" class="anchor" href="##{permalink}"><span class="anchor-icon"></span></a>#{title}</h#{level}>\n)
  end
end

def fromMarkdown(text)
  # options = [:fenced_code => true, :generate_toc => true, :hard_wrap => true, :no_intraemphasis => true, :strikethrough => true ,:gh_blockcode => true, :autolink => true, :xhtml => true, :tables => true]
  markdown = Redcarpet::Markdown.new(HTMLwithPygments,
                                     :fenced_code_blocks => true,
                                     :no_intra_emphasis => true,
                                     :autolink => true,
                                     :strikethrough => true,
                                     :lax_html_blocks => true,
                                     :superscript => true,
                                     :hard_wrap => true,
                                     :tables => true,
                                     :xhtml => true)
  markdown.render(text)
end

# UNSTYLED = (ARGV.first == '--unstyled')
UNSTYLED = true
puts fromMarkdown(STDIN.read)