Find different versions of same JAR in two paths

jardiff.groovy

commonLibs = [:]
leftLibs = []
rightLibs = []
if(args?.length > 1) {
    new File(args[0]).eachFileRecurse {
     fileName = (it.name - '.jar')
     fileNameNoVersion = fileName[0..fileName.lastIndexOf('-')-1]
     leftLibs += fileNameNoVersion
     commonLibs.putAt(fileNameNoVersion, commonLibs[fileNameNoVersion] ? (commonLibs[fileNameNoVersion] + [1:fileName]) : [1:fileName])
    }
    new File(args[1]).eachFileRecurse {
     fileName = (it.name - '.jar')
     fileNameNoVersion = fileName[0..fileName.lastIndexOf('-')-1]
     rightLibs += fileNameNoVersion
     commonLibs.putAt(fileNameNoVersion,  commonLibs[fileNameNoVersion] ? (commonLibs[fileNameNoVersion] + [2:fileName]) : [2:fileName])
    }
    leftLibs.intersect(rightLibs).each { lib ->
      println "${commonLibs[lib]}"
    }
}
else {
  // print usage
  println 'Usage: jardiff <path1> <path2>\nDisplays the JARs common to both paths (ignoring version) and the versions of those JARs in each path.'
}