Guard-premailer is a project mainly written in ..., based on the MIT license.
Inline your css into html for e-mail templates with guard
As the gem name suggests this is a guard extension. Make sure you get guard first.
Install the gem:
gem install guard-premailer
Add it to your Gemfile if you're using bundler (you should)
gem 'guard-premailer'
Add a basic guard setup:
guard init premailer
Pull requests are welcome.