Module: Binbundle::Prompt

Defined in:
lib/binbundle/prompt.rb

Overview

Command line prompts

Class Method Summary collapse

Class Method Details

.yn(question, default_response: nil) ⇒ Boolean

Ask a yes or no question in the terminal

Parameters:

  • question (String) —

    The question to ask

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

    default response if no input

Returns:

  • (Boolean) —

    yes or no



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# File 'lib/binbundle/prompt.rb', line 16

def self.yn(question, default_response: nil)
  $stdin.reopen('/dev/tty')

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

  # if this isn't an interactive shell, answer default
  return default if !$stdout.isatty || ENV['TESTING'] == 'true'

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

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

  res.chomp!
  res.downcase!

  return default if res.empty?

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