Redmine

The file lib/redmine/wiki_formatting/macros.rb

provides the following for plugins to create custom macros:

Redmine::WikiFormatting::Macros.register do
  desc "Glossary macro" 
  macro :glossary do |obj, args|
    args, options = extract_macro_options(args, :phrase, :definition)
  end
end

I'm trying to create a glossary macro such as the following:

{{glossary(GUI, phrase=Graphical User Interface, definition=A type of user interface item that allows people to interact with programs in more ways than typing.)}}

I've gotten it to work just fine except that none of the options can contain a comma (',') because it thinks that's the end of the option and is trying to move onto the next one.
So I have two questions: is it possible easily write a hook where one can either tweak how it reads the options or even just provide a way to escape the comma (such as '\,')?
Another idea I had was to put all options are separate lines so a new line would represent the end of the option, like the following:

{{glossary(
GUI
phrase=Graphical User Interface
definition=A type of user interface item that allows people to interact with programs in more ways than typing.
)
}}

Can anyone give me a little bit of direction on how to go about writing a hook to accomplish either one of these?

Thanks