# Produces a unique word list of a text file

unless ARGV[0]
  puts "USAGE: ruby unique_words.rb <<text file>>"
  exit 1
end

file = File.new( File.expand_path( ARGV[0] ) )
@words = []

file.readlines.join.split.each do |word|
    @words << word.gsub(/[^\w]/, "")
end

puts @words.uniq!, "" if ARGV[1]

puts "#{@words.length} unique words in #{file.path.split("/").last}"