twitter_links.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'twitter'

help_message = <<HELP_MESSAGE
Create a twitter client script that retrieves all the unique http links in the
last 100 most recent tweets using a hashtag parameter. The application should
be executable from the command line and should print the results to STDOUT.

We will run the script by passing it a hashtag e.g.
$ ruby twitter_links.rb someHashtag

Sample Output:
1. http://some.url.test
2. http://another.url.test
3. http://again.url.test
HELP_MESSAGE

if ARGV.size != 1
  puts help_message
  exit 1
end

# https://dev.twitter.com/docs/api/1/get/search
#
# parameters:
#   result_type = recent
#   include_entities = true (we want twitter to parse urls for us)
#   rpp = 100 (returning twits per page. max is 100 according to API)
all_urls = []
Twitter.search("#" + ARGV[0], :result_type => 'recent', :rpp => 100, :include_entities => true).each do |twit|
  twit.expanded_urls.each do |url|
    all_urls << url if not url.nil?
  end
end

all_urls.uniq.each_with_index do |url, index|
  puts (index + 1).to_s + ". " + url
end

so what do you think?