Middleman function to link to pages that exist, or print out that they need to be written

gistfile1.rb

  def pattern_link(pattern_name, link_name = nil)
    pages = sitemap.resources.select{ | page | page.url.start_with?('/patterns/') and page.data.title == pattern_name} 

    if pages.empty?
      puts "Need to write a pattern for " + pattern_name
      return '<span class="pending_pattern">' + pattern_name + '</span>'
    else
      if pages.length > 1
        puts "Warning: more than one pattern page for " + pattern_name
      end

      page = pages[0]

      if not link_name
        link_name = pattern_name
      end

      title = page.data.category + " Pattern: " + pattern_name

      return '<a href="' + page.url + '" title="' + title + '" class="pattern">' + link_name +' </a>'
    end
  end