Thorを使ったパスワード生成Rubyスクリプトサンプル

passgen.rb

# -*- coding: utf-8 -*-

require 'rubygems'
require 'thor'

class Passgen < Thor
  TABLE = {
    :number => (0x30...0x3A).map(&:chr), # 0123456789
    :upper  => (0x41...0x5b).map(&:chr), # ABCDEFGHIJKLMNOPQRSTUVWXYZ
    :lower  => (0x61...0x7b).map(&:chr), # abcdefghijklmnopqrstuvwxyz
    :symbol => (0x21...0x30).map(&:chr), # !\"\#$%&'()*+,-./
  }.freeze

  class_option :help, :alias => '-h', :type => :boolean, :desc => 'ヘルプを表示'

  desc 'generate', 'パスワード生成'
  method_option :length, :alias => '-l', :type => :numeric, :default => 8,     :desc => 'パスワード文字数'
  method_option :count,  :alias => '-c', :type => :numeric, :default => 10,    :desc => '生成個数'
  method_option :number, :alias => '-n', :type => :boolean, :default => true,  :desc => '数字を使用'
  method_option :upper,  :alias => '-u', :type => :boolean, :default => true,  :desc => '大文字を使用'
  method_option :lower,  :alias => '-l', :type => :boolean, :default => true,  :desc => '小文字を使用'
  method_option :symbol, :alias => '-s', :type => :boolean, :default => false, :desc => '記号文字を使用'
  def generate
    prepare :generate

    table = TABLE.dup.tap {|table|
      TABLE.keys.each do |key|
        table.delete key unless options.send key
      end
    }.values.flatten

    rand_max = table.size

    options[:count].times do
      say [].tap {|r|
        options[:length].times do
          r << table[rand * rand_max]
        end
      }.join ''
    end
  end

  desc 'help [TASK]', 'ヘルプを表示'
  def help(*args)
    super
  end

  private
  def prepare(task)
    if options.help?
      help task
      raise SystemExit
    end
  end
end

Passgen.start