#!/usr/bin/env ruby

if !File.file?('Gemfile.erb')
  puts "Not using Gemfile.erb, exiting."
  exit 0
end

require 'erb'

env = ARGV[0]

File.open('Gemfile', 'w') { |fh| fh.print ERB.new(File.read('Gemfile.erb')).result(binding) }
system %{bundle}

puts "Gemfile switched to #{env}"