progress bars from purrr doesn't render

[StaffanBetner]

This is a simple example that doesn't show an expected progress bar:

library(purrr)
walk(1:10, ~Sys.sleep(0.5), .progress = TRUE)

[georgestagg]

Thanks for reporting this! It looks like any kind of cli progress bars are not working in the webR demo application, not just from purrr.

[HenrikBengtsson]

FWIW, similarly, it looks like output to stdout/stderr cannot be refreshed/flushed while running, e.g.

for (kk in 0:99) { cat(sprintf("%3d\r", kk)); Sys.sleep(0.1); flush(stdout()) }; cat("\n")

Same for

for (kk in 0:99) { cat(sprintf("\r%3d", kk)); Sys.sleep(0.1); flush(stdout()) }; cat("\n")