Access to pass 2 variables

[tlienart]

e.g. :_generated_body

also, possibly, if there's function called in pass 2 that allocates variables like {{allocate x 5}} then x wouldn't be available from getvarfrom.

Probably best to tell users not to do the latter, but :_generated_body might make sense (also :_relative_url and prepath prefix in the pass 2). Might make sense to have a restricted list of pass 2 variables, and have getvar behave differently with those (though we should proceed with care to avoid the kind of Franklin fuckups...)

[tlienart]

ref https://github.com/pkalikman/newblog/issues/1

[tlienart]

safest (to avoid adding passes and risking to fall back in the @delay pit of doom) is probably to tell people that they should use a dedicated hfun which does:

1. gets _generated_ihtml
2. runs html2(...)

this will do more work than required (2x html2 of some content) but is likely easier than to figure out some form of 3d pass re-trigger.

need to have some form of error handling to stop this from looping though... so maybe the function should have a depth indicator so that if a _generated_ihtml contains something that itself wants to call that function, it just fails (depth 1).

Seems like a valid use case is to be able to retrieve something like {{getbodyfrom ...}} / Utils.hfun_getbodyfromUtils.getbodyfrom(...). The Utils.getbodyfrom` would allow users to do some post-processing e.g. if they only want a chunk of it.