invoke_windows.go

//go:build windows

/*
 * Copyright (c) 2019, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package commands

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

func stdin() io.Reader {
	if isTerminal(int(os.Stdin.Fd())) {
		return nil
	}
	return os.Stdin
}

func isTerminal(fd int) bool {
	kernel32 := syscall.NewLazyDLL("kernel32.dll")
	procGetConsoleMode := kernel32.NewProc("GetConsoleMode")
	var st uint32
	r, _, e := syscall.Syscall(procGetConsoleMode.Addr(), 2, uintptr(fd), uintptr(unsafe.Pointer(&st)), 0)
	return r != 0 && e == 0
}