How to use

toParent

method

in

com.diffplug.common.tree.TreeStream

/**
 * @param project    the project on which we'll call {@link Project#javaexec(Action)}.
 * @param input        the JavaExecable which we'll take as input and call run() on.
 * @param settings    any extra settings you'd like to set on the JavaExec (e.g. heap)
 * @return the JavaExecable after it has had run() called.
 */
public static <T extends JavaExecable> T exec(Project project, T input, Action<JavaExecSpec> settings) throws Throwable {
  // copy the classpath from the project's buildscript (and its parents)
  List<FileCollection> classpaths = TreeStream.toParent(ProjectPlugin.treeDef(), project)
      .map(p -> p.getBuildscript().getConfigurations().getByName(BUILDSCRIPT_CLASSPATH))
      .collect(Collectors.toList());
  // add the gradleApi, workaround from https://discuss.gradle.org/t/gradle-doesnt-add-the-same-dependencies-to-classpath-when-applying-plugins/9759/6?u=ned_twigg
  classpaths.add(project.getConfigurations().detachedConfiguration(project.getDependencies().gradleApi()));
  // add stuff from the local classloader too, to fix testkit's classpath
  classpaths.add(project.files(JavaExecableImp.fromLocalClassloader()));
  // run it
  return JavaExecableImp.execInternal(input, project.files(classpaths), settings, execSpec -> JavaExecWinFriendly.javaExec(project, execSpec));
}