[chaley]

Originally Posted by ownedbycats

program: 
switch_if(
	$series_index ==#'0', '',
	$series_index
	)

Worked. Have not figure out how to turn 1.04 into 1-4 though.

Assuming you use n.m only for omnibus-style books, multiple books in order, and not for intermediate books e.g. a book 2.5 that falls between 2 and 3, then this might work:

program:
	series_start = floor($series_index);
	fraction = fractional_part($series_index);
	if fraction ==# 0 then
		result = series_start
	else
		series_end = floor(fraction*100);
		if series_end >=# 0 then
			result = series_start & '-' & series_end
		fi
	fi;
	result

This template assumes you always use 2 digits in the fraction. How to disambiguate single digit fractions and 2 digit fractions isn't obvious.

Also, if you have both omnibus and intermediate books (as I do) then you would need some way to distinguish between them. I would use a Yes/No "Is Omnibus" column for this.

It might be easiest in the long run to have a text custom column that contains the series string you want for the book.

Maybe this could be split into a thread for development subforum.

I put it in the devices forum.