//go:build linux

package formatter

import (
	"syscall"
	"unsafe"
)

type winsize struct {
	Row, Col       uint16
	Xpixel, Ypixel uint16
}

// getTerminalWidth returns the width of the stdout terminal in columns.
// If the output is not a terminal or the width cannot be determined, it returns (0, error).
func getTerminalWidth() (int, error) {
	var ws winsize
	_, _, errno := syscall.Syscall(
		syscall.SYS_IOCTL,
		uintptr(syscall.Stdout),
		uintptr(syscall.TIOCGWINSZ),
		uintptr(unsafe.Pointer(&ws)),
	)
	if errno != 0 {
		return 0, errno
	}
	return int(ws.Col), nil
}