Middleman + Jade + Bower

middleman-config.rb

# ====================================================================
# Bower
sprockets.append_path File.join root, 'bower_components'
Dir['bower_components/*'].each do |dir|
  sprockets.import_asset File.basename(dir)
end

# ====================================================================
# Jade
require 'jade-rails'
class JadeTemplate < Tilt::Template
  def prepare; end
  def evaluate(context, locals, &block)
    Jade.compile(data, filename: eval_file)
  end
end

::Sprockets.register_engine '.jade', JadeTemplate