[ownedbycats]

Thanks.

I converted one of my templates to get a better idea of how the switch_if works. Is this a good place to use one?

program:
	switch_if(
		'Cleanup' in virtual_libraries(), 'polish.png',
		'Fanfiction' in $#booktype, list_split(icons_fanfic(), ':', 'ff'); 
			ff_0,
		'Documentations & Manuals' in $#booktype, 'helpbook.png',
		'Loans' in virtual_libraries(), 'overdrive.png',
		'Physical Books' in virtual_libraries(), 'paperbook.png',
		approximate_formats()=='PDF', 'pdfbook.png',
		'omnibus' inlist $#admintags, 'bookshelf.png',
		'book_open.png',
	)

original first_non_empty template:

Spoiler:

program:
	first_non_empty(
		if 'Cleanup' in virtual_libraries() then 'polish.png' fi,
		if 'Fanfiction' in $#booktype then 
			list_split(icons_fanfic(), ':', 'ff'); 
		ff_0 fi,
		if 'Documentations & Manuals' in $#booktype then 'helpbook.png' fi,
		if 'Loans' in virtual_libraries() then 'overdrive.png' fi,
		if 'Physical Books' in virtual_libraries() then 'paperbook.png' fi,
		if approximate_formats()=='PDF' then 'pdfbook.png' fi,
		if 'omnibus' inlist $#admintags then 'bookshelf.png' fi,
		'book_open.png',
	)

(at times like this, sometimes I wish there was some sort of split template editor so I could compare the results of two templates. That's probably not too useful generally though.)