post.rb

class Article
  def self.path=(path)
    @path = path
  end
  def self.path(article_slug=nil)
    article_slug ? File.join(@path, "#{article_slug}.haml") : @path
  end
  def self.files
    Dir["#{File.expand_path(Article.path)}/*.haml"]
  end
  def self.all
    self.files.collect {|f| new(f, File.read(f))}
  end
  def self.[](slug)
    path = path(slug)
    File.exist?(path) && new(path, File.read(path))
  end
  def self.template_variable(text, name)
    text[/\-\s*#\s*#{name}:\s*(.+)/, 1]
  end
  def self.parse_date(date_string)
    date_string && Time.local(*date_string.split('-').map{|s|s.to_i})
  end
  
  attr_reader :path, :template
  
  def initialize(file_path, file_contents)
    @path = file_path
    @template = file_contents
  end
  def slug
    File.basename(self.path, ".haml")
  end
  alias :dom_id :slug
  def title
    @title ||x= template_variable("title")
  end
  def published
    @published ||= self.class.parse_date(template_variable("published"))
  end
  def updated
    @updated ||= self.class.parse_date(template_variable("updated"))
  end
  def last_modified
    updated || published
  end
  def tags
    @tags ||= template_variable("tags")
  end
  def template_variable(name)
    self.class.template_variable(self.template, name)
  end
  def <=>(other)
    [other.published.year, other.published.month, other.published.day] <=> [self.published.year, self.published.month, self.published.day]
  end
  def ==(other)
    other.respond_to?(:slug) && self.slug == other.slug
  end
  def path_without_extension
    self.path.sub(".haml", "")
  end
end