How to use

createFileFromTemplate

method

in

com.intellij.ide.actions.CreateFileFromTemplateAction

 private static void doTemplateTest(@NotNull PsiDirectory dir, @NotNull String newFileName, @NotNull String expectedPackage, @NotNull  CustomFileTemplate template) {
  GoFile file = (GoFile)CreateFileFromTemplateAction.createFileFromTemplate(newFileName, template, dir, null, true);
  assertNotNull(file);
  assertEquals(expectedPackage, file.getPackageName());
  WriteCommandAction.runWriteCommandAction(dir.getProject(), file::delete);
 }
}

 @Override
 protected PsiFile createFileFromTemplate(String name, FileTemplate template, PsiDirectory dir) {
  final List<String> pathChunks = new ArrayList<>();

  if (StringUtil.contains(name, PerlPackageUtil.PACKAGE_SEPARATOR)) {
   pathChunks.addAll(StringUtil.split(name, PerlPackageUtil.PACKAGE_SEPARATOR));
  }
  else if (StringUtil.contains(name, "/")) {
   pathChunks.addAll(StringUtil.split(name, "/"));
  }
  else {
   pathChunks.add(name);
  }
  name = pathChunks.remove(pathChunks.size() - 1);

  for (String pathChunk : pathChunks) {
   if (StringUtil.isNotEmpty(pathChunk)) {
    final PsiDirectory sub = dir.findSubdirectory(pathChunk);
    dir = sub == null ? dir.createSubdirectory(pathChunk) : sub;
   }
  }
  return super.createFileFromTemplate(name, template, dir);
 }
}