A simple Rack server to serve a directory of files

fileserve.rb

# turn any directory into a simple fileserver
#
# USAGE:
#   ruby fileserve.rb # starts server for current dir on port 4567
#   ruby fileserve.rb ../ # starts server for parent dir
#   ruby fileserve.rb ../ 4568 # starts server for parent dir on port 4568

require 'rack'
require 'webrick'
require 'sinatra/base'

class FileServer < Sinatra::Base
  set :public, ARGV[0] || Dir.pwd
end

Rack::Handler::WEBrick.run(FileServer.new, :Port => ARGV[1] || 4567)