Query the size of the current terminal
If the standard output of the current R process is not a terminal, e.g. because it is redirected to a file, or the R process is running in a GUI, then it will throw an error. You need to handle this error if you want to use this function in a package.
ps_tty_size()
If an error happens, the error message is different depending on what type of device the standard output is. Some common error messages are:
"Inappropriate ioctl for device."
"Operation not supported on socket."
"Operation not supported by device."
Whatever the error message, ps_tty_size always fails with an error of
class ps_unknown_tty_size, which you can catch.
# An example that falls back to the 'width' option
tryCatch(
ps_tty_size(),
ps_unknown_tty_size = function(err) {
c(width = getOption("width"), height = NA_integer_)
}
)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.