Method: Dialog.select_one

Defined in:
lib/nera/nera_dialog.rb

.select_one(arr, message = "Input the number", default = 0) ⇒ Object

Select one from the list specified by the array.



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# File 'lib/nera/nera_dialog.rb', line 12

def select_one( arr, message = "Input the number", default = 0)
  unless arr.is_a?(Array) and arr.size >= 1 and default.to_i >= 0 and default.to_i < arr.size
    raise ArgumentError, "Arguments are not valid."
  end

  while true
    $stdout.puts( "#{message} : [#{default.to_s}]")
    arr.size.times do |i|
      puts( "[#{i}]:\t#{arr[i]}")
    end
    buf = Readline.readline(PROMPT).chomp.strip
    buf = default.to_s if buf==''

    unless buf.match(/^[0-9]+$/)
      $stdout.puts "The input #{buf} is not valid. Try again"
      redo
    end
    num = Integer(buf)
    if num >= 0 and num < arr.size
      valid_input = true
      return num
    end
    $stdout.puts "Your input is not valid. Try again."
  end
end