Class Question::MultipleChoice is a simple, closed-ended question type that lets respondents select one or multiple answers from a defined list of choices.

question_multiple_choice.rb

# Class Question::MultipleChoice is a simple, closed-ended question type that lets respondents select one or multiple
# answers from a defined list of choices.
#
# @example Definition
#    question = Question::MultipleChoice.new("Reference doesn't seem to be regular release. MAKE A BUILD?")
#      .choice(:build,   'b', '[b]uild')
#      .choice(:install, 'i', '[i]nstall and build')
#      .choice(:clean,   'c', '[c]lean install and build')
#      .choice(:skip,    's', '[s]kip')
#      .choice(:quit,    'q', '[q]uit')
#
#    answer = question.ask
#
#    case answer
#    when :build
#      puts '=>>>> [b]uild'
#    when :install
#      puts '=>>>> [i]nstall and build'
#    when :clean
#      puts '=>>>> [c]lean install and build'
#    when :skip
#      puts '=>>>> [s]kip'
#    when :quit
#      puts '=>>>> [q]uit'
#    end
#
# @example Result
#
#   Reference doesn't seem to be regular release. MAKE A BUILD?
#     [b]uild'
#     [i]nstall and build'
#     [c]lean install and build'
#     [s]kip'
#     [q]uit'
#
module Question
  class MultipleChoice
    Choice = Struct.new(:name, :shortkey, :label)

    attr_reader :question, :choices

    def initialize(question, choices = [])
      @question = question
      @choices = choices
    end

    def choice(name, shortkey, label)
      @choices << Choice.new(name, shortkey, label)
      self
    end

    def ask
      answer = loop do
        $stdout.puts render
        input = $stdin.gets.chomp
        next if input.size.zero?
        choice = find_choice(input)
        break choice if choice
      end
      answer.name
    end

    def ask_with_inquiry
      ActiveSupport::StringInquirer.new(ask.to_s)
    end

    def render
      "\e[33m#{render_question}#{render_choices}\e[0m"
    end

  protected

    def find_choice(input)
      choices.find { |o| o.shortkey.to_s == input || o.name.to_s == input }
    end

    def render_question
      question
    end

    def render_choices
      "\n  " + choices.map(&:label).join("\n  ")
    end
  end
end