build.gradle

apply plugin: 'java'

def gemJarName ="sassJar"

repositories { 
  mavenCentral()
}

dependencies {
  runtime group: 'org.jruby', name: 'jruby-complete', version: '1.7.8' 


}

task getRuby(type: Copy) {
 into "dist"
 from configurations.runtime
}

task buildJarDir(dependsOn: getRuby) << {
   new File("dist/"+gemJarName).mkdir()

}

task installGems(dependsOn: buildJarDir) <<  { 

  def gems = new File('gems.properties')
  gems.eachLine {
	println "Searching for " + it
	def sout = new StringBuffer(), serr = new StringBuffer()
	def proc = ['java', '-jar', 'jruby-complete-1.7.8.jar', '-S', 'gem', 'install','-i', './' +gemJarName, it, '--no-rdoc', '--no-ri'].execute(null, new File("dist")) 
	proc.consumeProcessOutput(sout, serr)
	proc.waitFor()
	println "out> $sout err> $serr"
  }

}

task gemJar(dependsOn: installGems, type:Jar) {
	archiveName gemJarName + ".jar"
	destinationDir new File("dist")
	from ("dist/" + gemJarName)	
}