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// predicate: func(S entry) -> bool (yes = should put in tar)
svoid tarInJar_withMD5_withPredicate(File jarIn, File jarOut, IF1<S, Bool> putInTar) ctex {
  IF1<S, Bool> dontPutInTar = name -> !putInTar.get(name);
  
  temp ZipOutputStream zipOut = zipOutputStream(jarOut);
  zip2zip_withPredicate(jarIn, zipOut, dontPutInTar);
  
  print("tarInJar_withMD5 " + f2s(jarIn) + " => " + f2s(jarOut));
  File tar = createTempFile("", ".tar");
  print("  temp: " + f2s(tar));
  temp tempDeleteFile(tar);
  
  zip2tar_withPredicate(jarIn, tar, putInTar);
  file2zip(zipOut, tar, "bulk-" + md5(tar) + ".tar");
}

svoid tarInJar_withMD5_withPredicate(File jarIn, IF1<S, Bool> predicate) {
  if (!fileExists(jarIn)) ret;
  File jarOut = fileInSameDirectory(jarIn, dropSuffixIC(".jar", jarIn.getName()) + ".repacked.jar");
  renameFileToUniqueName(jarOut); // backup old version
  tarInJar_withMD5_withPredicate(jarIn, jarOut, predicate);
}

svoid tarInJar_withMD5(S jarIn, IF1<S, Bool> predicate) {
  tarInJar_withMD5_withPredicate(newFile(jarIn), predicate);
}