Module: Doing::PromptYN

Included in:
Prompt
Defined in:
lib/doing/prompt/yn.rb

Overview

Request Yes/No answers on command line

Instance Method Summary collapse

Instance Method Details

#yn(question, default_response: false) ⇒ Boolean

Ask a yes or no question in the terminal

Parameters:

  • question (String) —

    The question to ask

  • default_response (Boolean) (defaults to: false) —

    default response if no input

Returns:

  • (Boolean) —

    yes or no



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# File 'lib/doing/prompt/yn.rb', line 16

def yn(question, default_response: false)
  return @force_answer == :yes ? true : false unless @force_answer.nil?

  $stdin.reopen('/dev/tty')

  default = if default_response.is_a?(String)
              default_response =~ /y/i ? true : false
            else
              default_response
            end

  # if global --default is set, answer default
  return default if @default_answer

  # if this isn't an interactive shell, answer default
  return default unless $stdout.isatty

  # clear the buffer
  if ARGV&.length
    ARGV.length.times do
      ARGV.shift
    end
  end
  system 'stty cbreak'

  cw = white
  cbw = boldwhite
  cbg = boldgreen
  cd = Color.default

  options = unless default.nil?
              "#{cw}[#{default ? "#{cbg}Y#{cw}/#{cbw}n" : "#{cbw}y#{cw}/#{cbg}N"}#{cw}]#{cd}"
            else
              "#{cw}[#{cbw}y#{cw}/#{cbw}n#{cw}]#{cd}"
            end
  $stdout.syswrite "#{cbw}#{question.sub(/\?$/, '')} #{options}#{cbw}?#{cd} "
  res = $stdin.sysread 1
  puts
  system 'stty cooked'

  res.chomp!
  res.downcase!

  return default if res.empty?

  res =~ /y/i ? true : false
end