find and copy the latest version of a gem

gistfile1.sh

$ latest haml
Request: http://rubygems.org/api/v1/gems/haml.json
Version: 3.0.25

# cmd+v
$ 3.0.25

$ latest doesnotexist
Request: http://rubygems.org/api/v1/gems/doesnotexist.json
It will be mine. Oh yes. It will be mine.

latest.rb

#!/usr/bin/env ruby
require "net/http"
require "uri"
require "json"

if gem = ARGV.first
  uri = URI.parse("http://rubygems.org/api/v1/gems/#{gem}.json")
  puts "Request: #{uri}"

  begin
    response = Net::HTTP.get_response(uri)
    version = JSON.parse(response.body)["version"]
    puts "Version: #{version}"
    `echo "#{version}" | pbcopy`
  rescue => e
    if e.message =~ /could not be found/
      puts "It will be mine. Oh yes. It will be mine."
    else
      puts "Oops ..."
      puts e
    end
  end
else
  puts "gem?"
end