config.rb

require 'builder'
require 'execjs'
require 'open3'
require 'tilt'

require (File.dirname __FILE__) + "/lib/pandoc_helper"
require (File.dirname __FILE__) + "/lib/showdown_helper"
require (File.dirname __FILE__) + "/lib/posts_helper"


### PANDOC Markdown Rendering

class ::PandocMarkdownRenderTemplate < ::Tilt::Template
  def prepare 
  end
  def evaluate(scope,locals,&block)
    @output = PandocHelper.render_markdown data
  end
end

Tilt.register PandocMarkdownRenderTemplate, 'mkd'
Tilt.register PandocMarkdownRenderTemplate, 'markdown'
Tilt.register PandocMarkdownRenderTemplate, 'md'
Tilt.prefer PandocMarkdownRenderTemplate 

set :markdown_engine, PandocMarkdownRenderTemplate


### 
# Compass
###

require 'ninesixty'

# Susy grids in Compass
# First: gem install compass-susy-plugin
# require 'susy'

# Change Compass configuration
 compass_config do |config|
   #  config.output_style = :compact
   #
   config.preferred_syntax = :sass
 end

###
# Haml
###

# CodeRay syntax highlighting in Haml
# First: gem install haml-coderay
# require 'haml-coderay'

# CoffeeScript filters in Haml
# First: gem install coffee-filter
require 'coffee-filter'

# Automatic image dimensions on image_tag helper
# activate :automatic_image_sizes

###
# Page command
###
 
page "/posts/feed.xml", :layout => false

# Per-page layout changes:
# 
# With no layout
# page "/path/to/file.html", :layout => false
# 
# With alternative layout
# page "/path/to/file.html", :layout => :otherlayout
# 
# A path which all have the same layout
# with_layout :admin do
#   page "/admin/*"
# end

# Proxy (fake) files
# page "/this-page-has-no-template.html", :proxy => "/template-file.html" do
#   @which_fake_page = "Rendering a fake page with a variable"
# end

###
# Helpers
###

# Methods defined in the helpers block are available in templates
# helpers do
#   def some_helper
#     "Helping"
#   end
# end

# Change the CSS directory
# set :css_dir, "alternative_css_directory"

# Change the JS directory
# set :js_dir, "alternative_js_directory"

# Change the images directory
# set :images_dir, "alternative_image_directory"

# Build-specific configuration
configure :build do
  # For example, change the Compass output style for deployment
  activate :minify_css
  
  # Minify Javascript on build
  activate :minify_javascript

  #activate :asset_hash
  
  # Enable cache buster
  #activate :cache_buster
  

  # Use relative URLs
  # activate :relative_assets
  
  # Compress PNGs after build
  # First: gem install middleman-smusher
  # require "middleman-smusher"
  # activate :smusher
  
  # Or use a different image path
  # set :http_path, "/Content/images/"
end

index.html.haml

- @post = PostsHelper.load_post (File.dirname __FILE__)
!= partial "post"

lib_pandoc_helper.rb

module ::PandocHelper
  def self.render_markdown input
    puts "RENDERING MARKDOWN WITH PANDOC"
    sin,sout,serr,wait = Open3.popen3("pandoc -f markdown -") 
    sin.write input 

    sin.close
    sout.read
  end
end

lib_posts_helper.rb

module ::PostsHelper

  POST_MATCHER = /\/\d\d\d\d\/\d\d\/\d\d\/(\w|\d|-)+$/
  TITLE_MATCHER = /((^\/|\w|\d|-)+)$/
  DATE_MATCHER = /\/(\d\d\d\d)\/(\d\d)\/(\d\d)\/(\w|\d|-)+$/

  def self.load_post start_dir
    puts "LOADING POST #{start_dir}"
    post = {}
    post[:meta] = load_metadata start_dir
    post[:content] = render_markdown File.read start_dir + "/_post_content.mkd"
    if File.exist? start_dir + "/_post_appendix.mkd"
      post[:appendix] = render_markdown File.read start_dir + "/_post_appendix.mkd"
    end
    post
  end

  def self.load_metadata start_dir
    TITLE_MATCHER =~ start_dir
    meta = YAML.load_file start_dir + "/_post_meta.yml"
    meta["title"] ||= $1.gsub(/_/x, " ")
    DATE_MATCHER =~ start_dir
    published = Time.parse "#{$1}-#{$2}-#{$3}"
    meta["published"] = published
    #require 'pry'; binding-pry
    if meta["updated"] 
      meta["updated"] = Time.parse meta["updated"].to_s 
    end
    POST_MATCHER =~ start_dir
    meta["path"] ||=  $& +"/"
    meta["tags"] = meta["tags"].map{|s| s.downcase}.sort.join ', ' if meta["tags"] and meta["tags"].kind_of? Array
    meta
  end

  def self.load_index posts_dir
    posts = []
    (Dir.glob (posts_dir+"/**/*")).each do |f|
      if f =~ POST_MATCHER 
        meta_data = load_metadata f
        posts.unshift meta_data
      end
    end
    posts
  end

  def self.render_markdown data
    ::PandocHelper.render_markdown data
  end


  def self.build_feed posts

    xml = ::Builder::XmlMarkup.new(:indent => 2)
    xml.instruct!
    xml.feed :xmlns => "http://www.w3.org/2005/Atom" do |feed|
      feed.author do |author|
        author.name "Dr. Thomas Schank"
        author.uri "http://dr.th.schank.ch/"
      end
      feed.title "Dr. Tom's Posts"
      feed.subtitle "Don't reinvent the wheel unless you want to know how to make good wheels."
      feed.id "http://drtom.schank.ch/posts/"
      feed.updated Time.now.iso8601

      posts.each do |post|
        feed.entry do |entry|
          entry.title  post["title"] 
          entry.published post["published"]
          entry.updated post["updated"] if post["updated"]
          entry.summary post["abstract"]
          fullpath="/posts"+post["path"]
          entry.id fullpath
          entry.link :href=>fullpath
        end
      end
    end
  end


end