Question about save to disk template

[Jahlon]

I have read about the calibre template language here but still am not sure how to do exactly what I want to do. I would like to write one template that will do the following:

If the book has a series:
{series}/{series_index:0>3s} - {title}/{title} - {authors}

but if the book has no series:
{author_sort}/{title}/{title} - {authors}

From reading about how to do conditionals, I have the following:
{series:||/{series_index:0>3s} - }{title}/{title} - {authors}

This will result in only books with series getting placed in a series subfolder, but I can't figure out how to do the "else", where when the book does not have a series it will instead get placed in an author subfolder. Is there any way to do this? Maybe it is obvious and I am just missing it...

[theducks]

chaley did this for me way back when I only had my EZReader

I made a few small changes over the years.

program:test(field('series'),strcat(
substr(field('series'), 0, 1),template("-series/{series:subitems(0,1)||/}{series:subitems(1,2)||/}{series_index:0>5.2f}-{title}_{authors}_{id}")
),template("00noseries/{author_sort[0]}_authors/{author_sort}/{title}-{authors}_{id}")
)

Since it did not have any bookshelf
I had Noseries make a folder by Author (last) Initial, then put the author in that
Similar, I had Series by letter, then name. I use 2 decimals to indicate omnibus or a short (between main) Thus the 5.2f