Create nsis script using ant

Hi,
I have server and client code for both I use "ant" to build the projects. Once the build is made I manually use HM Edit to create an .nsi file and customize according to our requirement. Now I want to automate this process of creating .nsi file. Is it possible using ant script? if yes please provide me the link to follow up. if no also please suggest me the way to automate.

Thanks,
Jayam