A basic cgi script

a basic webrick cgi server and script

#!/usr/bin/env ruby

################################################################
# A basic cgi script.  To run, set up the following:
#
#  /dir
#  |- cgi-bin
#  |   `- this_script.cgi
#  `- the_webrick_script.rb
#
# (Of course the_webrick_script is this commented-out bit)
# The only trick is that this_script.cgi must have execution
# priviledges; else you will get a 'Premature end of script 
# headers' error.  Note the shebang line too...
# 
# Assembled from: 
# - {Gnomes Guide to Webrick}[http://microjet.ath.cx/webrickguide/html/CGIHandler.html]
# - {CGI documentation}[http://stdlib.rubyonrails.org/libdoc/cgi/rdoc/classes/CGI.html]
################################################################
# require 'webrick'
# 
# include WEBrick
# 
# def start_webrick(config = {})
#   # always listen on port 8080
#   config.update(:Port => 8080)     
#   server = HTTPServer.new(config)
#   yield server if block_given?
#   ['INT', 'TERM'].each {|signal| 
#     trap(signal) {server.shutdown}
#   }
#   server.start
# 
# end
# 
# start_webrick {|server|
#   cgi_dir = File.expand_path('./cgi-bin')
#   server.mount("/cgi-bin", HTTPServlet::FileHandler, cgi_dir, 
#     {:FancyIndexing=>true})
# }

require "cgi"
cgi = CGI.new("html3")  # add HTML generation methods
cgi.out() do
  cgi.html() do
    cgi.head{ cgi.title{"TITLE"} } +
    cgi.body() do
      cgi.form("post") do
        cgi.textarea("get_text") +
        cgi.br +
        cgi.submit
      end +
      cgi.pre() do
        CGI::escapeHTML(
          "params: " + cgi.params.inspect + "\n" +
          "cookies: " + cgi.cookies.inspect + "\n" +
          ENV.collect() do |key, value|
            key + " --> " + value + "\n"
          end.join("")
        )
      end
    end
  end
end