[chaley]

Originally Posted by ownedbycats

Question:

program:
	ids = $identifiers;
	mobi = select(ids, 'mobi-asin');
	amazon = select(ids, 'amazon');

	if 
		mobi && !amazon
	then 
		n = re(mobi, '(.*)', '\1');
		ids = list_union(ids, strcat('amazon:', n), ',')
	else
		ids
	fi;


	if 
		mobi == amazon
	then
		ids = list_difference(ids, strcat('mobi-asin:', mobi), ',')
	else
		ids
	fi

I have two books. Book #1 has only the mobi-asin identifier, while Book #2 has identical mobi-asin and amazon ids.

The results are this:

Attachment 193744

Aside from either separating the two parts into separate templates or running it twice, is there any way to tell it "do part A (copy mobi-asin to amazon), and then also do part B (remove mobi-asin)"?

EDIT: See my post in the while loop thread.

I don't understand the question. As you have it, both clauses will be executed. What do you want that is different from that?

Aside: what is the "n = re(mobi, '(.*)', '\1');" for? That (almost) copies mobo to n. Except there will be problems with the .*, which can copy the empty string. Why not just use 'mobi' in the list_union()?