This article is quite old.Time flies when you're having fun. I've been writing for my blog for a long time. Stuff changes fast, especially in the Ruby world. That's why I've put this warning on old posts. The article might still be valid, though.
I've updated my Gemfile syntax file, adding a dash of color and making sure it supports all elements of the Bundler DSL. You can get it here. You'll also need to tell vim to automatically use it when opening a Gemfile by adding this file.
This is how it looks with the ir_black colorscheme:
source :rubygems gem 'rails' gem 'hoptoad_notifier' gem 'newrelic_rpm', :require => false gem 'mysql2' gem 'devise' # ... etc ... platforms :ruby_18 do gem 'system_timer' gem 'fastercsv' end group :development, :test do gem 'rspec-rails', '2.0.0.beta.20' end