[solved] WPS - how to collapse empty lines?

[sellsky]

I'm trying to make WPS display some data on each line:

Artist
Composer
Album, Disk#-Track#
et cetera

The first approach was

Code: [Select]

%s%al%?ia<%ia|%?d(2)<%d(2)>>
%s%al%?ic<%ic>
%s%al%?id<%id%?in<%, %?ik<%ik-%in|%in>>>
...

This works pretty well, however, if there is no Composer in tags, I see the ugly empty line between Artist and Composer. What can I do to collapse this empty line? Just:

Artist
Album, Disk#-Track#
et cetera

I moved the newline under condition,

Code: [Select]

%s%al%?ia<%ia|%?d(2)<%d(2)>>%?ic<
%s%al%ic>
%s%al%?id<%id%?in<%, %?ik<%ik-%in|%in>>>
...

and then

Code: [Select]

%s%al%?ia<%ia|%?d(2)<%d(2)>>%?ic<
%ic>
%s%al%?id<%id%?in<%, %?ik<%ik-%in|%in>>>
...

-- the first one just replaces Artist line with Composer if there is a Composer tag, and the second one joins Artist and Composer on the same line. Newline isn't respected at all.

If I add some text after “%?ic<”, the checkwps tool complains about 'Expected list close', so I move the wrong way I guess. I googled the web and especially this forum, with no luck. Of couse I can bloat the code, making conditions for every line here and then, but this doesn't smell good.

Any suggestions?

[Julian67]

It's quite a while since I made a wps but I think the solution is to make a different viewport for each situation, much like many themes use a different viewport depending on the presence of album art.  So you make a conditional "if composer tag present use viewport A, otherwise use viewport B".