| install_screenshot | R Documentation | 
Codes are from URL shown below.
https://superuser.com/questions/75614/take-a-screen-shot-from-command-line-in-windows#answer-1751844
On Mac screencapture is usually available.
On Linux GNOME desktop use gnome-screenshot.
If not installed, run sudo apt install gnome-screenshot.
install_screenshot(bin_dir = "")
bin_dir | 
 A string of directory to be installed.  | 
A string of installed directory.
if(interactive()){
# need only on Win
if(get_os() == "win"){
  bin_dir <- fs::path_package("screenshot")
  # if you want to install another directory
  #   bin_dir <- "SET_YOUR DIRECTORY"
  install_screenshot(bin_dir)
}
}
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