Terminal utils

This is a backport of shutil.get_terminal_size from Python 3.3. The original implementation is in C, but here we use the ctypes and fcntl modules to create a pure Python version of os.get_terminal_size.

console.get_terminal_size.get_terminal_size(fallback=(80, 24))

Get the size of the terminal window. For each of the two dimensions, the environment variable, COLUMNS and LINES respectively, is checked. If the variable is defined and the value is a positive integer, it is used. When COLUMNS or LINES is not defined, which is the common case, the terminal connected to sys.__stdout__ is queried by invoking os.get_terminal_size. If the terminal size cannot be successfully queried, either because the system doesn’t support querying, or because we are not connected to a terminal, the value given in fallback parameter is used. Fallback defaults to (80, 24) which is the default size used by many terminal emulators. The value returned is a named tuple of type os.terminal_size.