jni-natives.gradle

def findNativeName() {
    final String osNameStr = System.properties['os.name']
    return [
        'linux':    {
            osNameStr ==~ /(?i)linux.*/
        },
        'windows':    {
            osNameStr ==~ /(?i)windows.*/
        },
        'osx':    {
            osNameStr ==~ /(?i)os.?x.*/
        },
    ].find({k, v -> v()}).key
}

def listNativeDeps(nativeName) {
    return configurations.runtime.findAll { 
        final String filename = it.name
        filename.contains(nativeName)
    }
}

def unpackNativeDeps(dstDir) {
    final String nativeName = 'natives-' + findNativeName()
    println("nativeName = " + nativeName)
    final Collection deps = listNativeDeps(nativeName)
    println("nativeDeps = " + deps)
    // make-dir
    if(new File(dstDir).exists()){
        println("skip unpackNatives -- dstDir exists = " + dstDir)
    }else{
        ant.mkdir(dir: dstDir)
        deps.each {
            println("unpack-native-deps to " + dstDir + " <-- " + it.name)
            ant.unzip(src: it.absolutePath, dest: dstDir)
        }           
    }
}

project.ext.nativesDir = project.buildDir.absolutePath + "\\natives"
println "nativesDir: " + project.ext.nativesDir

task unpackNatives << {
    println "task :unpackNatives"
    unpackNativeDeps(project.ext.nativesDir)
}

run.dependsOn ':unpackNatives'

run {
    final String javaLibraryPathOpt = String.format("-Djava.library.path=%s", project.ext.nativesDir)
    println("jvmArgs java.library.path = " + javaLibraryPathOpt)
    jvmArgs = [javaLibraryPathOpt]
}