public void printHelp()

in tooling/karaf-maven-plugin/src/main/java/org/apache/karaf/tooling/commands/AsciiDoctorCommandHelpPrinter.java [37:142]
101 lines of code
21 McCabe index (conditional complexity)

    public void printHelp(Action action, PrintStream out, boolean includeHelpOption) {
        Command command = action.getClass().getAnnotation(Command.class);
        Set<Option> options = new HashSet<>();
        List<Argument> arguments = new ArrayList<>();
        Map<Argument, Field> argFields = new HashMap<>();
        Map<Option, Field> optFields = new HashMap<>();
        for (Class<?> type = action.getClass(); type != null; type = type.getSuperclass()) {
            for (Field field : type.getDeclaredFields()) {
                Option option = field.getAnnotation(Option.class);
                if (option != null) {
                    options.add(option);
                }

                Argument argument = field.getAnnotation(Argument.class);
                if (argument != null) {
                    argument = replaceDefaultArgument(field, argument);
                    argFields.put(argument, field);
                    int index = argument.index();
                    while (arguments.size() <= index) {
                        arguments.add(null);
                    }
                    if (arguments.get(index) != null) {
                        throw new IllegalArgumentException("Duplicate argument index: " + index + " on Action " + action.getClass().getName());
                    }
                    arguments.set(index, argument);
                }
            }
        }
        if (includeHelpOption)
            options.add(HelpOption.HELP);

        out.println("= " + command.scope() + ":" + command.name());
        out.println();

        out.println("== Description");
        out.println();
        out.println(command.description());
        out.println();

        StringBuilder syntax = new StringBuilder();
        syntax.append(String.format("%s:%s", command.scope(), command.name()));
        if (options.size() > 0) {
            syntax.append(" [options]");
        }
        if (arguments.size() > 0) {
            syntax.append(' ');
            for (Argument argument : arguments) {
                syntax.append(String.format(argument.required() ? "%s " : "[%s] ", argument.name()));
            }
        }
        out.println("== Syntax");
        out.println();
        out.println(syntax.toString());
        out.println();

        if (arguments.size() > 0) {
            out.println("== Arguments");
            out.println();
            out.println("|===");
            out.println("|Name |Description");
            for (Argument argument : arguments) {
                String description = argument.description();
                if (!argument.required()) {
                    Object o = getDefaultValue(action, argFields.get(argument));
                    String defaultValue = getDefaultValueString(o);
                    if (defaultValue != null) {
                        description += " (defaults to " + o.toString() + ")";
                    }
                }
                out.println();
                out.println("| " + argument.name());
                out.println("| " + description);
            }
            out.println("|===");
            out.println();
        }
        if (options.size() > 0) {
            out.println("== Options");
            out.println();
            out.println("|===");
            out.println("|Name |Description");
            for (Option option : options) {
                StringBuilder opt = new StringBuilder(option.name());
                String desc = option.description();
                for (String alias : option.aliases()) {
                    opt.append(", ").append(alias);
                }
                Object o = getDefaultValue(action, optFields.get(option));
                String defaultValue = getDefaultValueString(o);
                if (defaultValue != null) {
                    desc += " (defaults to " + defaultValue + ")";
                }
                out.println();
                out.println("|" + opt);
                out.println("|" + desc);
            }
            out.println("|===");
            out.println();
        }
        if (command.detailedDescription().length() > 0) {
            out.println("== Details");
            out.println();
            out.println(command.detailedDescription());
        }
        out.println();
    }