FR support for multi line execution

[olivroy]

Currently, this just errors

[georgestagg]

Thanks for making this request! I'm just going to expand with some thoughts below.

---

Running the following multiline code with the webR editor works OK. In other words, it works when the full script is valid R code:

dplyr::tibble(
  mtcars
)

The following code indeed does error, but this is to be expected in the current implementation since the script is source()-ed by the webR app when the run button has been pressed.

dplyr::tibble(

Partial execution (leaving the R console with a continue prompt, similar to directly executing the code into the console):

> dplyr::tibble(
+ 

is a little difficult right now. We explicitly source() the script because for longer R scripts it's possible to run out of space in the R input buffer. Perhaps we should send to console when the length is shorter than the input buffer, and only source() R scripts longer than that, but this would create different behaviours depending on the length of your script - not ideal.

Alternatively, we could chunk longer R scripts into blocks that fit into R's input buffer, then execute the chunks sequentially. This is probably the best option in the long run.

[olivroy]

Oh, I should have been maybe more specific. The full code included a pipe. Thanks for considering!

dplyr::tibble(
  x = c(1, 2)
 ) |> 
  dplyr::mutate(
     y = x ** 2
)