code formatter for grails and Groovy?

Try NetBeans v.6.7 (not the current production release 6.5) with the NetBeans Groovy/Grails plugin enabled. This is a nice clean IDE interface (easier to use than Eclipse IMHO), and you can set it up to integrate with your Grails installation. You can call all your Grails tasks from the IDE, edit your code, test and run your project. Then, if you want to format your code, you just right-click in the code editor and select "Format". Easy!