[chaley]

Originally Posted by ownedbycats

program:
	g = field('#genres');
	k = field('#kobocoll');

	if list_contains(g, ',', '^Fanfiction$', '1', '') then
		k = list_union(k, 'Fanfiction', ',')
	fi;

	if list_contains(g, ',', '^Cozy Mystery$', '1', '') then
		k = list_union(k, 'Cozy Mysteries', ',')
	fi;

	if list_contains(g, ',', '^(Fantasy|Science Fiction)$', '1', '') then
		k = list_union(k, 'Fantasy & Sci-Fi', ',')
	fi;

	k

How would I run the first match it finds? For example, if I have a book with "Cozy Mystery" and "Fantasy" in g, I only want it to add Cozy Mysteries.

Use 'elif' (else if) instead of 'if'. Assuming all three are mutually exclusive and in priority order, then this:

program:
	g = field('#genres');
	k = field('#kobocoll');

	if list_contains(g, ',', '^Fanfiction$', '1', '') then
		k = list_union(k, 'Fanfiction', ',')
	elif list_contains(g, ',', '^Cozy Mystery$', '1', '') then
		k = list_union(k, 'Cozy Mysteries', ',')
	elif list_contains(g, ',', '^(Fantasy|Science Fiction)$', '1', '') then
		k = list_union(k, 'Fantasy & Sci-Fi', ',')
	fi;

	k

EDIT: If the sequence of choices is long then the first_non_empty() function may be more appropriate than a sequence of ifs. As in:

program:
	g = field('#genres');
	k = field('#kobocoll');

	v = first_non_empty(
		list_contains(g, ',', '^Fanfiction$', 'Fanfiction', ''),
		list_contains(g, ',', '^Cozy Mystery$', 'Cozy Mysteries', ''),
		list_contains(g, ',', '^(Fantasy|Science Fiction)$', 'Fantasy & Sci-Fi', '')
	);

	list_union(k, v, ',')