How about use maven-exec->call grunt->compile CSS?
http://addyosmani.com/blog/making-maven-grunt/
This is more flexible than sass-maven-plugin, as we can do lot of stuff in 
grunt, such unit test.

> -----Original Message-----
> From: Brian Federle [mailto:brian.fede...@citrix.com]
> Sent: Tuesday, September 17, 2013 3:53 PM
> To: 'dev@cloudstack.apache.org'
> Cc: Rayees Namathponnan; Frank Zhang; Animesh Chaturvedi
> Subject: RE: [DISCUSS] CSS framework for CloudStack UI
> 
> Following up with this thread I started last month.
> 
> For the first step (hopefully ready by 4.3), I'm planning on getting the
> SCSS/SASS compiler working with the UI build  ->
> https://github.com/Jasig/sass-maven-plugin. I've experimented with it using
> the existing CSS in our UI, and it will be pretty easy to use right away, then
> will gradually refactor over time into a more robust framework. Hopefully I
> can set up a work-in-progress branch up soon once I've got something
> tangible.
> 
> Amit/Rayees/Frank/anyone else, let me know if you are able to find out if
> this is fairly easy to setup; I'm not familiar at all with Maven, so will 
> need a
> fellow expert to help out here :)
> 
> -Brian
> 
> -----Original Message-----
> From: Amit Das [mailto:amit....@cloudbyte.com]
> Sent: Monday, August 12, 2013 10:11 PM
> To: dev@cloudstack.apache.org
> Subject: Re: [DISCUSS] CSS framework for CloudStack UI
> 
> Hi Brian,
> 
> I should be able to help on the build tools part.
> 
> However, I am new to ACS & ACS UI. So I might take some time to
> understand the existing build process of ACS UI.
> 
> We can surely coordinate on this.
> 
> 
> Regards,
> Amit
> *CloudByte Inc.* <http://www.cloudbyte.com/>
> 
> 
> On Thu, Aug 8, 2013 at 11:11 PM, Brian Federle
> <brian.fede...@citrix.com>wrote:
> 
> > That sounds awesome, though I'm not too much of a guru with either
> > maven or grunt -- I would be glad to coordinate with anyone who wants
> > to take that on.
> >
> > -Brian
> >
> > -----Original Message-----
> > From: Amit Das [mailto:amit....@cloudbyte.com]
> > Sent: Tuesday, August 06, 2013 10:16 PM
> > To: dev@cloudstack.apache.org
> > Subject: Re: [DISCUSS] CSS framework for CloudStack UI
> >
> > This is definitely a great idea.
> >
> > Will it be feasible to decouple the front-end build from server-side
> > build as mentioned in the following link:
> > http://addyosmani.com/blog/making-maven-grunt/
> >
> >
> > Regards,
> > Amit Kumar Das
> > *CloudByte Inc.* <http://www.cloudbyte.com/>
> >
> >
> > On Wed, Aug 7, 2013 at 5:48 AM, Ian Duffy <i...@ianduffy.ie> wrote:
> >
> > > +1 to that definitely!
> > >
> > >
> > > > The only problem I cannot handle is integrating the SASS compiler
> > > > (which
> > > converts .scss->.css) into the UI build phase. I've found a maven
> > > plugin at https://github.com/Jasig/sass-maven-plugin, so if anyone
> > > wants to tackle that  it would be awesome.
> > >
> > >
> > > Below is a meer suggestion, I've only read about it and never done it.
> > > I believe you are able to chain grunt into the maven life cycle.
> > > This would allow us to do various things with the front end code.
> > > This includes but is not limited to:
> > >
> > > - JSHint
> > > - Unit tests via xyz(suggesting QUnit or Jasmine) framework
> > > - Static analysis of the javascript with Plato
> > > - Compiling SASS + LESS
> > > - Uglifying/Minifying
> > > - Optimise images(png crush etc.)
> > > - Dependency management of 3rd party js libs
> > >
> > > It would supply us with a bunch nicer build process for the UI
> > > elements of Cloudstack. However it would add a dependency of nodejs
> > > to the build process.
> > >
> >

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