code: public void usage(PrintWriter writer, Help.ColorScheme colorScheme) {
          writer.print(usage(new StringBuilder(), getHelpFactory().create(getCommandSpec(), colorScheme)));
          writer.flush();
      }
docs: Similar to {@link #usage(PrintStream, Help.ColorScheme)}, but with the specified {@code PrintWriter} instead of a {@code PrintStream}.
  @since 3.0