class OptionParser::Switch::RequiredArgument

‘ARG’ is an arbitrary non-blank text
’ ARG’ giving something like ‘-X<text>=ARG’ or ‘-X<text> ARG’ where
Switch arguments should be indicated by either appending ‘=ARG’ or
switches.
where ‘X’ is the common start character for a group of short multichar
These must be defined using a format like ‘-X<text>’ or ‘-X{text}’
arguments.
multi character short switches (single ‘-’ prefix) with (optional)
Customize OptionParser RequiredArgument switch class to support

def initialize(pattern = nil, conv = nil, 

def initialize(pattern = nil, conv = nil,
               short = nil, long = nil, arg = nil,
               desc = ([] if short or long), block = nil, &_block)
  block ||= _block
  super(pattern, conv, short, long, arg, desc, block)
  if (@long.nil? || @long.empty?) && (@arg =~ /^(<.*>|[\{].*[\}])((=|\s).*)?/)
    @multichar_short = true
    @has_arg = (@arg =~ /^(<.*>|[\{].*[\}])(=|\s).*$/ ? true : false)
  end
end

def parse(arg, argv) 

def parse(arg, argv)
  if @multichar_short && @has_arg
    # unless arg included in rest of switch or next arg is not a switch
    unless (arg && arg =~ /.*=.*/) || (argv.first =~ /^-/)
      # concatenate next arg
      arg ||= ''
      arg += "=#{argv.shift}"
    end
  end
  self._org_parse(arg, argv)
end