`cljr--reader-condtional-context` will return the current context at point or nil.

(cljr--reader-conditional-context) is more robust and returns *any* of the
possible context at point (ie :cljs, :clj, :bb, :default).

`cljr--beginning-of-reader-conditional` is not an exact match, as this moved to
the start of the conditional as a side-effect, but it should be trivial to move
backward to the same point from an excursion to the char returned from cljr--beginning-of-reader-conditional.

…st-libspec`