You preffer to use HAML instead of ERB, so everytime you start a new rails project you have to add the gem and run some commands to set it up.
Instead of doing all these steps each time you start a new rails project, you can setup an application template like this:
To use this template for a new project, you simple run:
hackman@dev:~$ rails new -m ~/path/to/my-template.rb
To add this template to an existing project, you simple run:
hackman@dev:~$ rails app:template LOCATION=~/path/to/my-template.rb
To set this template as default for all new projects you just need to add the following line to your .railsrc file:
Check out the Rails docs for more info about application templates.