Clive, 2nd ed. User's manual. Section 2 
SYNOPSYS

import "clive/cmd/tty"

func Cols() (int, error)
func IsTTY(f *os.File) bool
func Rows() (int, error)

DESCRIPTION

UNIX tty tools

FUNCTIONS

func Cols() (int, error)
    Return cols of the current tty window

func IsTTY(f *os.File) bool
    Return true if f refers to a tty

func Rows() (int, error)
    Return rows of the current tty window

User's manual, 2nd ed. Section 2