Use WEBrick to start a web server serving static content

ws.rb

#!/usr/bin/env ruby
#original source http://eggandham.com/2010/11/use-webrick-to-start-a-web-server-serving-static-content/
require 'webrick'
require 'optparse'
 
include WEBrick    # let's import the namespace so
                   # I don't have to keep typing
                   # WEBrick:: in this documentation.
options = {:Port=>8090,  :DocumentRoot=> './'}
 
optparser = OptionParser.new do |opts|
    opts.banner = "Usage: #{File.basename(__FILE__)} [options]"
    opts.on("-p", "--port port_num", "Specify Port Number") do |port|
        options[:Port] = port
    end
    opts.on("-d", "--docroot path", "Specify Document Root Folder") do |root|
        options[:DocumentRoot] = root
    end
end
 
def start_webrick(config = {})
  server = HTTPServer.new(config)
  ['INT', 'TERM'].each {|signal|
    trap(signal) {server.shutdown}
  }
  #open the browser in the default browser
  `which gnome-open && gnome-open http://localhost:#{config[:Port]}/`
  server.start
end
 
begin
  #parse options and start server
  optparser.parse!(ARGV)
  start_webrick(options)
rescue StandardError=>e
  puts e
  puts optparser.to_s
end