ramen timer using windows schtasks command

schtasks.rb

class SchTasks
  def initialize(password = nil)
    @password = password
  end
  
  def include?(taskname)
    schtasks('/query', '/nh') do |f|
      f.read =~ /^#{taskname}/
    end
  end
  
  def create(taskname, time, cmd, freq)
    hms = time.strftime('%H:%M:%S')
    ymd = time.strftime('%Y/%m/%d')
    
    schtasks('/create',
      '/tn', taskname,
      '/sc', freq,
      '/sd', ymd,
      '/st', hms,
      '/tr', %_"#{cmd}"_) do |f|
      f.puts @password if @password
    end
  end
  
  private
  def schtasks(*args, &blk)
    open("|schtasks #{args.join ' '}", 'r+', &blk)
  end
end

if __FILE__ == $0
  require 'optparse'
  autoload :Win32API, 'Win32API'
  
  def main
    opts = parse_opts
    
    if opts[:messagebox]
      msg = opts[:message]
      api = Win32API.new('user32', 'MessageBoxA', 'pppi', 'i')
      api.call(nil, msg, 'moo', 0)
      return
    end
    
    name = opts[:name] || 'moo'
    time = make_time(opts[:minute])
    cmd = make_cmd(opts[:message] || "moo")
    
    tasks = SchTasks.new(opts[:pass])
    
    name = name.succ while tasks.include?(name)
    
    tasks.create(name, time, cmd, :once)
  end

  def make_cmd(msg)
    $:.grep(/site_ruby\z/).min {|a,b| a.size <=> b.size } =~ /lib/
    ruby = "#{$`}bin/rubyw.exe".tr('/', '\\')
    script = File.expand_path($0).tr('/', '\\')

    %_"""#{ruby}""" -x """#{script}""" --messagebox -m """#{msg}"""_
  end

  def make_time(minute)
    Time.now + minute.to_i * 60
  end

  def parse_opts
    opts = {}
    
    ARGV.options do |o|
      o.on '--messagebox' do |opts[:messagebox]| end
      o.on '-p', '--pass=PASSWORD' do |opts[:pass]| end
      o.on '-t', '--time=MINUTE' do |opts[:minute]| end
      o.on '-n', '--name', 'task name' do |opts[:name]| end
      o.on '-m', '--message=MSG' do |opts[:message]| end
      
      ARGV.parse!
      
      unless opts[:pass] && opts[:minute] || opts[:messagebox] && opts[:message]
        puts o
        exit 1
      end
    end
    
    opts
  end
  
  main
end