avalade/grunt-coffee — pull request #12 by siriux (2012-08-07 06:56:48+00:00)
Title: Added support for the base_path option.

If you just want to preserve the directory structure, starting from a base path, pass the base_path option.

options: {
preserve_dirs: true,
base_path: 'path/to'
}

This will create the files under where/you/want/your/js/files/coffee/files/.