rmarkdown/knitr: How to format function output as code?

Question

Here's a rmarkdown snippet:

#Is this even achievable?
```{r echo = FALSE, comment = ""}
install.package(mvbutils)
library(mvbutils)
make.usage.section("paste", env=asNamespace('base'))
```

As expected this (when knitred in RStudio to pdf) prints something along the lines of

paste(..., sep = " ", collapse = NULL)

Note the absence of the leading ##, by default appended to function output but in this example switched off using the comment flag. Is it possible to further adapt the representation of that output such that it equates (code highlighting and all) to the output of:

```{r eval = FALSE}
paste(..., sep = " ", collapse = NULL)
```

I'm writing a howto and this would make life REALLY easy.

Answer 1

You can assign code to a chunk via the code option. Then formatR::usage() returns the code to show the usage of a function. Putting them together:

```{r, code=formatR::usage('paste'), eval=FALSE}
```