Octopress Tips: stylesheetsだけアップデートする

desc "Update stylesheets"
task :css do
  raise "### You haven't set anything up yet. First run `rake install` to set up an Octopress theme." unless File.directory?(source_dir)
  puts "## Update stylesheets"
  system "compass compile --css-dir #{source_dir}/stylesheets"
  cp_r "#{source_dir}/stylesheets/.", "#{public_dir}/stylesheets/"
end