detect terminal

main.go

package main

import (
	"fmt"
	"os"
	"syscall"
	"github.com/monochromegane/terminal"
)

const (
	stdin  = 0
	stdout = 1
)

func isatty(fd uintptr) bool {
	dll := syscall.MustLoadDLL("msvcrt.dll")
	defer dll.Release()

	isatty := dll.MustFindProc("_isatty")
	ret, _, _ := isatty.Call(fd)
	return int(ret) != 0
}

func main() {
	if terminal.IsTerminal(os.Stdin) {
		fmt.Printf("[terminal]stdin  has not been redirected to file\n")
	} else {
		fmt.Printf("[terminal]stdin  has been redirected to file\n")
	}
	if terminal.IsTerminal(os.Stdout) {
		fmt.Printf("[terminal]stdout has not been redirected to file\n")
	} else {
		fmt.Printf("[terminal]stdout has been redirected to file\n")
	}
	if isatty(stdin) {
		fmt.Printf("[_isatty ]stdin  has not been redirected to file\n")
	} else {
		fmt.Printf("[_isatty ]stdin  has been redirected to file\n")
	}
	if isatty(stdout) {
		fmt.Printf("[_isatty ]stdout has not been redirected to file\n")
	} else {
		fmt.Printf("[_isatty ]stdout has been redirected to file\n")
	}
}