how to tell if code is executed within a knitr/rmarkdown context?

Question

Based on some simple tests, interactive() is true when running code within rmarkdown::render() or knitr::knit2html(). That is, a simp

Answer 1

As Yihui suggested on github isTRUE(getOption('knitr.in.progress')) can be used to detect whether code is being knitted or executed interactively.