/*	UNIX tty tools*/package tty import (	"os"	"os/exec"	"strconv"	"strings") func tput(w string) (int, error) {	ifd, err := os.Open("/dev/tty")	if err != nil {		return 0, err	}	defer ifd.Close()	ofd, err := os.Create("/dev/tty")	if err != nil {		return 0, err	}	defer ofd.Close()	cmd := exec.Command("tput", w)	cmd.Stdin = ifd	cmd.Stderr = ofd	tpout, err := cmd.Output()	if err != nil {		return 0, err	}	out := strings.TrimSpace(string(tpout))	return strconv.Atoi(string(out))} // Return cols of the current tty windowfunc Cols() (int, error) {	return tput("cols")} // Return rows of the current tty windowfunc Rows() (int, error) {	return tput("rows")}