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
  disposition = opts[:disposition]
  filename    = opts[:filename]
  disposition = :attachment if disposition.nil? and filename
  filename    = path        if filename.nil?
  attachment(filename, disposition) if disposition
  last_modified opts[:last_modified] if opts[:last_modified]
  file   = Rack::File.new(File.dirname(settings.app_file))
  result = file.serving(request, path)
  result[1].each { |k,v| headers[k] ||= v }
  headers['Content-Length'] = result[1]['Content-Length']
  opts[:status] &&= Integer(opts[:status])
  halt (opts[:status] || result[0]), result[2]
rescue Errno::ENOENT
  not_found
end