// Based on ssh/terminal:
 // Copyright 2011 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 // +build windows,!appengine
 
 package logrus
 
 import (
 	"bytes"
 	"errors"
 	"io"
 	"os"
 	"os/exec"
 	"strconv"
 	"strings"
 	"syscall"
 	"unsafe"
 )
 
 var kernel32 = syscall.NewLazyDLL("kernel32.dll")
 
 var (
 	procGetConsoleMode = kernel32.NewProc("GetConsoleMode")
 	procSetConsoleMode = kernel32.NewProc("SetConsoleMode")
 )
 
 const (
 	enableProcessedOutput           = 0x0001
 	enableWrapAtEolOutput           = 0x0002
 	enableVirtualTerminalProcessing = 0x0004
 )
 
 func getVersion() (float64, error) {
 	stdout, stderr := &bytes.Buffer{}, &bytes.Buffer{}
 	cmd := exec.Command("cmd", "ver")
 	cmd.Stdout = stdout
 	cmd.Stderr = stderr
 	err := cmd.Run()
 	if err != nil {
 		return -1, err
 	}
 	
 	// The output should be like "Microsoft Windows [Version XX.X.XXXXXX]"
 	version := strings.Replace(stdout.String(), "\n", "", -1)
 	version = strings.Replace(version, "\r\n", "", -1)
 
 	x1 := strings.Index(version, "[Version")
 
 	if x1 == -1 || strings.Index(version, "]") == -1 {
 		return -1, errors.New("Can't determine Windows version")
 	}
 
 	return strconv.ParseFloat(version[x1+9:x1+13], 64)
 }
 
 func init() {
 	ver, err := getVersion()
 	if err != nil {
 		return
 	}
 
 	// Activate Virtual Processing for Windows CMD
 	// Info: https://msdn.microsoft.com/en-us/library/windows/desktop/ms686033(v=vs.85).aspx
 	if ver >= 10 {
 		handle := syscall.Handle(os.Stderr.Fd())
 		procSetConsoleMode.Call(uintptr(handle), enableProcessedOutput|enableWrapAtEolOutput|enableVirtualTerminalProcessing)
 	}
 }
 
 // IsTerminal returns true if stderr's file descriptor is a terminal.
 func IsTerminal(f io.Writer) bool {
 	switch v := f.(type) {
 	case *os.File:
 		var st uint32
 		r, _, e := syscall.Syscall(procGetConsoleMode.Addr(), 2, uintptr(v.Fd()), uintptr(unsafe.Pointer(&st)), 0)
 		return r != 0 && e == 0
 	default:
 		return false
 	}
 }