Slide level in lua filters

[Bruno Grenet <bruno.grenet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Hi,

Is it possible to access the *computed* slide level from a lua filter? 

I know that one can access to the slide-level command line option, though 
it is not always explicitly provided. In that case, the writers (? not 
sure) determine a slide-level by some rule. My question is whether this 
slide level can be used inside a lua filter.

For my use case, other possibilities may exist. Indeed, I am creating 
Beamer slides from markdown. What I'd really like to access is the 
"(beamer) block level": That is, headers with a level lower than the slide 
level are converted to beamer blocks in the LaTeX writer. I'd like to be 
able to apply a filter on these beamer blocks. This corresponds to applying 
a filter to headers of a certain level, determined with respect to the 
slide level. It may be possible to achieve what I want with a custom 
writer, but I would prefer to stick to filters that I am more familiar with.

Thanks,
Bruno

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