R: Query the size of the current terminal

ps_tty_size {ps} | R Documentation

## Query the size of the current terminal

### Description

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.

### Usage

    ps_tty_size()

### Details

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.

### Examples

    # 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_)
      }
    )

[Package ps version 1.6.0 Index]