module Sinatra::Helpers

def send_file(path, opts={})
  if opts[:type] or not response['Content-Type']
    content_type opts[:type] || File.extname(path), :default => 'application/octet-stream'
  end
  if opts[:disposition] == 'attachment' || opts[:filename]
    attachment opts[:filename] || path
  elsif opts[:disposition] == 'inline'
    response['Content-Disposition'] = 'inline'
  end
  last_modified opts[:last_modified] if opts[:last_modified]
  file      = Rack::File.new nil
  file.path = path
  result    = file.serving env
  result[1].each { |k,v| headers[k] ||= v }
  halt result[0], result[2]
rescue Errno::ENOENT
  not_found
end