Add date to Octopress posts

add_date_to_posts.rb

Dir.glob("source/_posts/*.markdown").each do |filename|
  formatted_date = filename.split("/").last[0..9]
  puts "Adding date #{formatted_date} to file #{filename}"

  lines = []
  IO.readlines(filename).map do |line|
    lines << line
    lines << "date: #{formatted_date}" if line =~ /^title: /
  end

  File.open(filename, 'w') do |file|
    file.puts lines
  end
end