public String getPlaceholder() {
        if( placeholder != null ) {
            return "<" + placeholder + ">";
        } else {
            return "";
        }
    }
Defines a command line interface for use in {@link ConfigOption} with automatic help description generation used by {@link ConfigOptionParser#printUsageAndExit(List)}
 Instantiation through {@link CommandLineOptionBuilder}
jgiven-core/src/main/java/com/tngtech/jgiven/report/config/CommandLineOption.java