a.rb

 ## -- Misc Configs -- ##
stash_dir       = "_stash"    # directory to stash posts for speedy generation
full_stash_dir  = "#{source_dir}/#{stash_dir}"    # full path for stash dir
stash_root_dir  = "_stash_root" # directory to stash pages (in /source/)
full_stash_root_dir = "#{source_dir}/#{stash_root_dir}" # full path for stash_root dir
root_stashes    = ['Your-Page'] # directories to be stashed in /source/


# usage rake isolate[my-post]
desc "Move all other posts than the one currently being worked on to a temporary stash location (stash) so regenerating the site happens much more quickly."
task :isolate, :filename do |t, args|
  if args.filename
    filename = args.filename
  else
    filename = Dir.glob("#{source_dir}/#{posts_dir}/*.#{new_post_ext}").sort_by{|f| File.mtime(f)}.last
  end
  if filename == nil
    puts ""
    puts "There is no markdown file (*.#{new_post_ext}) in #{source_dir}/#{posts_dir}."
    exit 1
  end
  puts "## Stashing other posts than #{filename}"
  FileUtils.mkdir(full_stash_dir) unless File.exist?(full_stash_dir)
  Dir.glob("#{source_dir}/#{posts_dir}/*") do |post|
    if post.include?(filename)
      p "Remaining #{post}..."
    else
      FileUtils.mv post, full_stash_dir
    end
  end
  FileUtils.mkdir(full_stash_root_dir) unless File.exist?(full_stash_root_dir)
  if defined? root_stashes == nil
    if root_stashes.class == String
      FileUtils.mv "#{source_dir}/#{root_stashes}", full_stash_root_dir
    elsif root_stashes.class == Array
      for d in root_stashes do
        FileUtils.mv "#{source_dir}/#{d}", full_stash_root_dir
      end
    end
  end
  system "touch .isolated"
end

desc "Move all stashed posts back into the posts directory, ready for site generation."
task :integrate do
  FileUtils.mv Dir.glob("#{full_stash_dir}/*"), "#{source_dir}/#{posts_dir}/"
  FileUtils.mv Dir.glob("#{full_stash_root_dir}/*"), "#{source_dir}/"
  system "rm -f .isolated"
  system "touch .integrated"
end