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