env_help.rb

#!/usr/env ruby
require 'rubygems'
require 'fileutils'

class Object
  def empty?
    return true if self.nil?
    case 
      when String, Array, Hash
        return true if self.length == 0
      else
        return false
      end
  end
end

def put_gems_unless_empty(message, gems)
  puts "\n#{message} gems\n#{'-' * (message.length + 5)}\n#{gems.strip}" unless gems.empty?
end

gems = `gem list`

os   = ENV['OS']
os = RUBY_PLATFORM if os.empty?


required_gems_shared      = `cat config/environment.rb | grep "config.gem"`
required_gems_test        = `cat config/environments/test.rb | grep "config.gem"`
required_gems_development = `cat config/environments/development.rb | grep "config.gem"`
required_gems_production  = `cat config/environments/production.rb | grep "config.gem"`
required_gems_cucumber    = `cat config/environments/cucumber.rb | grep "config.gem"`

puts "Project: #{FileUtils::pwd}"
puts "Date:    #{Date.today}"
puts
puts "OS Info: #{os}"
puts "Ruby:    #{RUBY_VERSION} p#{RUBY_PATCHLEVEL}"
puts
puts "Gems required in project (shallow scan)"
puts "---------------------------------------"
put_gems_unless_empty "Shared", required_gems_shared
put_gems_unless_empty "Development", required_gems_development
put_gems_unless_empty "Test", required_gems_test
put_gems_unless_empty "Production", required_gems_production
put_gems_unless_empty "Cucumber", required_gems_cucumber
puts
put_gems_unless_empty "Installed", gems