Add parameter for BookCollapseSectionLevel

[egonelbre]

For larger number of content it would be nice to specify a level where to automatically collapse pages, rather than specifying bookCollapseSection: true them individually to each item.

Note: I can try figure out an implementation, if it's seems suitable.

[alex-shpak]

Hi!
It was discussed before, can't find that issue now.
But, my conclusion was that thoose parameters will be too specific, and I try to avoid adding many configuration parameters in theme, less paramteres will help be maintaning it.

BookCollapseSectionLevel then will become BookCollapseSectionLevelFrom and BookCollapseSectionLevelToo and so on, as some users want to collaps top 3, other bottom 3, etc.

So I think it's better to keep it as it is.

[alex-shpak]

ah, here it is #340

[egonelbre]

Understandable, I definitely love the minimalist approach in hugo-book and wouldn't want to compromise it. I'll close the issue.

I was able to write custom menu-filetree that handles it, so it's not an hinderance for me.

[egonelbre]

Ah, btw. an alternative would be to let people specify BookCollapseSection at the site level. That way it wouldn't introduce a new concept, but allows to define the default behavior.