[chaley]

Originally Posted by ownedbycats

That worked.

Tweaking my #kobopath template:

[...]

Based on that second disadvantage, I'm inclined to go with option #1. Does this make sense?

I would avoid complexity and make the checks explicit. The new switch_if() makes it easy and compact to do the checks in order. Something like this:

program:

# Returns 'Fanfiction/Fandom' tag for fanfics
	booktype = 'Fanfiction';
	tags = 'Fanfiction.Bar, Fanfiction.Crossover, Fanfiction.Foo';
	if booktype == 'Fanfiction' then
		switch_if(
			'^Fanfiction\.Crossover$' inlist tags, 'Fanfiction/Crossover',
# More tests in the order you want
			'^Fanfiction\.Foo$' inlist tags, 'Fanfiction/Foo',
#			...
# If none of the tests find a value then end up picking the first one. 
# If the list is empty then this will return the empty string.
# You only need the list_re() if the list can contain values other than
# Fanfiction.XXX.
			list_item(list_re(tags, ',', '^Fanfiction.(.*)$', 'Fanfiction/\1'), 0, ',')
		)
	fi