A useful rake task of Octopress for listing published or unpublished posts.

Rakefile

# usage rake new_page[my-new-page] or rake new_page[my-new-page.html] or rake new_page (defaults to "new-page.markdown")
desc "List all posts with an asterisk if it's published. Advanced usage: 'rake list_posts[pub|unpub]'"
task :list_posts, :type do |t, args|
  type = args.type
  
  result = ""
  Dir.glob("#{source_dir}/#{posts_dir}/*.markdown").sort.each do |post|
    file = File.read(post)
    file =~ /^(---\s*\n.*?\n?)^(---\s*$\n?)/m
    data = YAML.load($1)
    
    case type
    when "pub" then 
      result << "#{File.basename(post)}\n" if data['published'] || data['published'] == nil
    when "unpub"
      result << "#{File.basename(post)}\n" if data['published'] == false
    else
      status = data['published'] || data['published'] == nil ? '*' : ' '
      result << "#{status} #{File.basename(post)}\n"
    end
  end
  puts result
end