anagram_for.rb

#!/usr/bin/env ruby

require 'open-uri'
require 'cgi'

class Anagram
  def initialize(phrase)
    @phrase   = phrase
    @response = fetch
  end

  def results(random)
    if random
      response.uniq.sample
    else
      response.uniq.sort.join("\n")
    end
  end

  private

  def response
    [].tap do |lines|
      @response.split("\n").each do |line|
        lines << line.sub("<br>", "") if word_result?(line)
      end
    end
  end

  def word_result?(string)
    string.match(/#{regex}/) && string.match(/^[a-z]/i)
  end

  def regex
    @regex ||= "(#{@phrase.scan(/./).join("|")})+" + "#{Regexp.escape('<br>')}"
  end

  def fetch
    open(url).read
  end

  def url
    "http://www.wordsmith.org/anagram/anagram.cgi?anagram=#{CGI.escape(@phrase)}&t=1000&a=n"
  end
end


if ARGV.any?
  random   = ARGV[0] == '-r' ? ARGV.shift : false
  anagrams = Anagram.new(ARGV.join(" "))

  puts anagrams.results(random)
else
  puts "Usage: #{File.basename($0)} phrase here"
  puts "    -r Random phrase"
  puts
end