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

A simpler suggestion for rolling your own: see if you can access current chunk options.

```{r, echo = FALSE}
inside_knitr = function() {
    length(knitr::opts_current$get()) > 0
}
```

```{r}
inside_knitr()
```

There are, of course, many things you could check. I like the idea of the current chunk options, another possibility is below. I'm not really sure about the pros/cons of either.

```{r}
!is.null(knitr::opts_knit$get("out.format"))
```