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Disable readline echo in R for mac GUI

2 messages · Jeroen Ooms, Dr Eberhard W Lisse

Original
Jeroen Ooms
# 
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)
}
Dr Eberhard W Lisse
# 
On my Mojave iMac

	commandArgs()

returns

on RStudio

	[1] "RStudio"	"--interactive"

on Mac GUI

	[1] "R"	"--no-save"	"--no-restore-data" "--gui=aqua"

and on R command line

	[1] "/Library/Frameworks/R.framework/Resources/bin/exec/R"

so maybe test for that?

el
On 15/11/2018 15:06, Jeroen Ooms wrote: