[TYPO3] Print link: how to toggle link parameters rewritten with RealURL

[Paul Vetch]

Hi there,

I'm having a problem getting my parameters to behave.

I have a templavoila site, and I'm running Realurl.  I've modified
TemplaVoila so that I can have two additional views: a print view and a
hi visibility view.

All I'm trying to do is make the function to toggle the views work with
RealURL.

What I want:

http://www.website.com/my_page/ - normal view
http://www.website.com/my_page/print.html - print view
http://www.website.com/my_page/textonly.html - alternate view

What I've done:

* config.linkVars is set to print,textonly;
* RealURL is working fine and is setup to see both print and textonly
variables and write them as filenames when it does;
* I've created two functions to generate realurl typolinks and append
the appropriate variables.

Problem:
* I cannot find a way to toggle the parameter off!

My TS (for the textonly link)

lib.hiVisURL = TEXT
lib.hiVisURL.typolink {
parameter.data = TSFE:id
useCacheHash = 1
returnLast = url
additionalParams = &textonly=1
}

[globalVar = GP: textonly = 1 ]
lib.hiVisURL.typolink.additionalParams = 
[global]

Trouble is, leaving additionalParams blank doesn't (wishful thinking)
strip the &textonly parameter off the realurl path.  And also,
returnLast = url continues to return
http://www.website.com/my_page/textonly.html - so once the textonly mode
has been toggled, there's no way to escape.

I've tried clearing the lib and remaking it, but I can still only get
hold of the RealURL with the parameter in place.

I need to know how to get hold of the realurl path of the current page,
*without* the textonly parameter, in the globalVar statement.  I've had
a look around and seen mention of a hypothetical
.addQueryString.removeParams method, but it doesn't seem to exist yet.

Can anyone help...