From: Kyle Murphy <kmurph79@...>
Date: 2008-06-30T08:05:34+09:00
Subject: Newbie Question On Ruby Quiz

I'm a programming and Ruby newbie.  I wanted to build some programs, so
I started Best of Ruby Quiz.

The first quiz is MadLibs (http://www.rubyquiz.com/quiz28.html) and,
given the answer, I can't even get it to work.

I have a ruby file with the answer in it:

# use Ruby's standard template engine
require "erb"

# storage for keyed question reuse
$answers = Hash.new

# asks a madlib question and returns an answer
def q_to_a( question )
  question.gsub!(/\s+/, " ")       # normalize spacing

  if $answers.include? question    # keyed question
    $answers[question]
  else                             # new question
    key = if question.sub!(/^\s*(.+?)\s*:\s*/, "") then $1 else nil end

    print "Give me #{question}:  "
    answer = $stdin.gets.chomp

    $answers[key] = answer unless key.nil?

    answer
  end
end

# usage
unless ARGV.size == 1 and test(?e, ARGV[0])
  puts "Usage:  #{File.basename($PROGRAM_NAME)} MADLIB_FILE"
  exit
end

# load Madlib, with title
madlib = "\n#{File.basename(ARGV.first, '.madlib').tr('_', ' ')}\n\n" +
         File.read(ARGV.first)
# convert ((...)) to <%= q_to_a('...') %>
madlib.gsub!(/\(\(\s*(.+?)\s*\)\)/, "<%= q_to_a('\\1') %>")
# run template
ERB.new(madlib).run



And a .madlib file with (copied from the book):
Our favorite language is ((gem:a gemstone)). We think ((gem)) is
better than ((a gemstone)).



Whenever I run the .rb file I get this error: Usage: madlib.rb
MADLIB_FILE

My question is basically: how do I make this program work?  Thank you.
-- 
Posted via http://www.ruby-forum.com/.