[chaley]

Originally Posted by zardoxnet

I am working on a metadata plugboard to be used when exporting a book and including all relevant details in the new comment field of the created book. So I have a template program and concatenate all values. The part I am looking for help with is in taking 3 values and printing them out with commas between them. Any of the 3 values might be blank, so I don't want to print a comma for those and don't want a hanging comma.
[snip]

Try this:

program:
	ids = list_remove_duplicates($#isbn_enter & ',' & $#isbn_p_enter & ',' 
		& $#isbn_asin, ',');
	if ids then
		OUTPUT6 = strcat('<tr><td>Identifier:</td><td>', ids, '</td></tr>')
	else
		OUTPUT6 = ''
	fi

This works because list_remove_duplicates():

• removes empty items as well as duplicates.
• removes leading and trailing spaces.
• if the separator is ',' then it (like most of the list functions) rebuilds the list using ', ' (comma space).
• returns the empty string if the list is empty.