Get terminal size from Go

term.go

package main

import (
	"fmt"
	"os"
	"syscall"
	"time"
	"unsafe"
)

type Winsize struct {
	Height uint16
	Width  uint16
	x      uint16
	y      uint16
}

func getTermSize() (uint16, uint16) {
	ws := &Winsize{}
	_, _, err := syscall.Syscall(syscall.SYS_IOCTL, os.Stdout.Fd(), uintptr(syscall.TIOCGWINSZ), uintptr(unsafe.Pointer(ws)))
	if err != 0 {
		return 0, 0
	}
	return ws.Width, ws.Height
}

func main() {
	for range time.Tick(250 * time.Millisecond) {
		w, h := getTermSize()
		fmt.Printf("%dx%d\n", w, h)
	}
}