refresh_gems.rb

require 'net/http'
require 'uri'
require 'json'

new_file_lines = []

File.open('.gems') do |file|
  file.each_line do |line|
    gem_name = line.split.first
    version = JSON.parse(Net::HTTP.get(URI.parse("http://gemcutter.org/gems/#{gem_name}.json")))["version"]
    new_file_lines << "#{gem_name} -v #{version}"
  end
end

puts new_file_lines.join("\n")