# File lib/getopts.rb, line 24
def getopts(single_options, *options)
  boolopts = {}
  valopts = {}

  #
  # set defaults
  #
  single_options.scan(/.:?/) do |opt|
    if opt.size == 1
      boolopts[opt] = false
    else
      valopts[opt[0, 1]] = nil
    end
  end if single_options

  options.each do |arg|
    opt, val = arg.split(':', 2)

    if val
      valopts[opt] = val.empty? ? nil : val
    else
      boolopts[opt] = false
    end
  end

  #
  # scan
  #
  c = 0
  argv = ARGV

  while arg = argv.shift
    case arg
    when /\A--(.*)/
      if $1.empty?                      # xinit -- -bpp 24
        break
      end

      opt, val = $1.split('=', 2)

      if opt.size == 1
        argv.unshift arg
        return nil
      elsif valopts.key? opt            # imclean --src +trash
        valopts[opt] = val || argv.shift or return nil
      elsif boolopts.key? opt           # ruby --verbose
        boolopts[opt] = true
      else
        argv.unshift arg
        return nil
      end

      c += 1
    when /\A-(.+)/
      opts = $1

      until opts.empty?
        opt = opts.slice!(0, 1)

        if valopts.key? opt
          val = opts

          if val.empty?                        # ruby -e 'p $:'
            valopts[opt] = argv.shift or return nil
          else                         # cc -ohello ...
            valopts[opt] = val
          end

          c += 1
          break
        elsif boolopts.key? opt
          boolopts[opt] = true         # ruby -h
          c += 1
        else
          argv.unshift arg
          return nil
        end
      end
    else
      argv.unshift arg
      break
    end
  end

  #
  # set
  #
  $OPT = {}

  boolopts.each do |opt, val|
    $OPT[opt] = val

    sopt = opt.gsub(/[^A-Za-z0-9_]/, '_')
    eval "$OPT_#{sopt} = val"
  end
  valopts.each do |opt, val|
    $OPT[opt] = val

    sopt = opt.gsub(/[^A-Za-z0-9_]/, '_')
    eval "$OPT_#{sopt} = val"
  end

  c
end