# encoding: utf-8

require 'anvil/parser'

module Anvil
  class Task
    # Cli options parsing definition
    module Options
      attr_reader :parser_block

      def help
        parser.help
      end

      def parser(&block)
        @parser_block = block
        @parser ||= build_parser(&block)
      end

      def build_parser(&block)
        parser = Anvil::Parser.new
        parser.task = self
        configure_parser(parser, &block)
        parser
      end

      def configure_parser(parser, &block)
        block ||= proc {}

        if description
          parser.separator ''
          parser.separator description
        end

        return parser unless parser.detect_options(&block)

        parser.separator ''
        parser.separator 'Available options: '
        parser.instance_eval(&block)
        parser
      end

      def parse_options!(arguments)
        parser.parse!(arguments)
        arguments << parser.options
      end
    end
  end
end