closure.js

var ArrayList         = Packages.java.util.ArrayList,
    File              = Packages.java.io.File,
    jscomp            = Packages.com.google.javascript.jscomp,
    SourceFile        = jscomp.SourceFile,
    BasicErrorManager = jscomp.BasicErrorManager,
    DepsGenerator     = jscomp.deps.DepsGenerator,
    InclusionStrategy = DepsGenerator.InclusionStrategy;

function jsFilesInDir(dir) {
    var ret   = new ArrayList(),
        files = (new File(dir)).listFiles();

    for(var i = 0; i < files.length; i++) {
        var file = files[i];
        if(file.isDirectory()) {
            ret.addAll(jsFilesInDir(file));
        } else {
            if(file.getName().endsWith(".js")) {
                ret.add(SourceFile.fromFile(file));
            }
        }
    }

    return ret;
}

function jsFilesInDirs(dirs) {
    var ret = new ArrayList();

    for(var i = 0; i < dirs.length; i++) {
        ret.addAll(jsFilesInDir(new File(dirs[i])));
    }

    return ret;
}

var deps = new ArrayList();

deps.add(SourceFile.fromFile(new File("deps/closure-library/closure/goog/deps.js")));

var dg = new DepsGenerator(
    deps,
    jsFilesInDirs(["src"]),
    InclusionStrategy.ALWAYS,
    (new File("deps/closure-library/closure/goog")).getAbsolutePath(),
    new BasicErrorManager() {
       report: function(level, error) {
           print(error);
       },
       println: function(level, error) {
           print(error);
       }
    }
);

print(dg.computeDependencyCalls());