//go:build windows

package main

import (
	"os"
	"syscall"
	"unsafe"
)

var getConsoleScreenBufferInfo = syscall.NewLazyDLL("kernel32.dll").NewProc("GetConsoleScreenBufferInfo")

// termWidth returns the width of the window of the console f, and false when
// f is not a console: GetConsoleScreenBufferInfo fails on anything else.
func termWidth(f *os.File) (int, bool) {
	var info struct {
		size, cursor             struct{ x, y int16 }
		attributes               uint16
		left, top, right, bottom int16
		maxX, maxY               int16
	}
	if ok, _, _ := getConsoleScreenBufferInfo.Call(f.Fd(), uintptr(unsafe.Pointer(&info))); ok == 0 {
		return 0, false
	}
	return int(info.right-info.left) + 1, true
}