[R-SIG-Mac] Disable readline echo in R for mac GUI

[Jeroen Ooms]

If anyone else is also interested in this, I found a satisfactory
solution to prompt for passwords in R.app using AppleScript. It is now
available in the 'askpass' package on CRAN.



On Thu, Nov 15, 2018 at 5:06 AM Jeroen Ooms <jeroenooms using gmail.com> wrote:
>
> When prompting the user for a password, we need to temporarily disable
> echo. In a tty we can call posix stty -echo (example below). The
> RStudio GUI has a native password entry function that can be triggered
> via getOption('askpass'). Is there simple method to prompt for a
> password in the R for Mac GUI (without depending on shiny or tcltk)?
>
> readline_password <- function(prompt = "Please enter password\n"){
>   if(isatty(stdin())){
>     if(system('stty -echo') == 0){
>       on.exit(system('stty echo'))
>     }
>   }
>   base::readline(prompt)
> }