cmd/geth: fix #853 colorize console output in windows

Godeps/Godeps.json

@@ -37,6 +37,14 @@
 			"ImportPath": "github.com/kardianos/osext",
 			"Rev": "ccfcd0245381f0c94c68f50626665eed3c6b726a"
 		},
+		{
+			"ImportPath": "github.com/mattn/go-colorable",
+			"Rev": "043ae16291351db8465272edf465c9f388161627"
+		},
+		{
+			"ImportPath": "github.com/mattn/go-isatty",
+			"Rev": "fdbe02a1b44e75977b2690062b83cf507d70c013"
+		},
 		{
 			"ImportPath": "github.com/obscuren/qml",
 			"Rev": "c288002b52e905973b131089a8a7c761d4a2c36a"

Godeps/_workspace/src/github.com/mattn/go-colorable/README.md

+# go-colorable
+
+Colorable writer for windows.
+
+For example, most of logger packages doesn't show colors on windows. (I know we can do it with ansicon. But I don't want.)
+This package is possible to handle escape sequence for ansi color on windows.
+
+## Too Bad!
+
+![](https://raw.githubusercontent.com/mattn/go-colorable/gh-pages/bad.png)
+
+
+## So Good!
+
+![](https://raw.githubusercontent.com/mattn/go-colorable/gh-pages/good.png)
+
+## Usage
+
+```go
+logrus.SetOutput(colorable.NewColorableStdout())
+
+logrus.Info("succeeded")
+logrus.Warn("not correct")
+logrus.Error("something error")
+logrus.Fatal("panic")
+```
+
+You can compile above code on non-windows OSs.
+
+## Installation
+
+```
+$ go get github.com/mattn/go-colorable
+```
+
+# License
+
+MIT
+
+# Author
+
+Yasuhiro Matsumoto (a.k.a mattn)

Godeps/_workspace/src/github.com/mattn/go-colorable/colorable_others.go

+// +build !windows
+
+package colorable
+
+import (
+	"io"
+	"os"
+)
+
+func NewColorableStdout() io.Writer {
+	return os.Stdout
+}
+
+func NewColorableStderr() io.Writer {
+	return os.Stderr
+}

Godeps/_workspace/src/github.com/mattn/go-isatty/README.md

+# go-isatty
+
+isatty for golang
+
+## Usage
+
+```go
+package main
+
+import (
+	"fmt"
+	"github.com/mattn/go-isatty"
+	"os"
+)
+
+func main() {
+	if isatty.IsTerminal(os.Stdout.Fd()) {
+		fmt.Println("Is Terminal")
+	} else {
+		fmt.Println("Is Not Terminal")
+	}
+}
+```
+
+## Installation
+
+```
+$ go get github.com/mattn/go-isatty
+```
+
+# License
+
+MIT
+
+# Author
+
+Yasuhiro Matsumoto (a.k.a mattn)

Godeps/_workspace/src/github.com/mattn/go-isatty/doc.go

+// Package isatty implements interface to isatty
+package isatty

Godeps/_workspace/src/github.com/mattn/go-isatty/isatty_bsd.go

+// +build darwin freebsd
+
+package isatty
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+const ioctlReadTermios = syscall.TIOCGETA
+
+// IsTerminal return true if the file descriptor is terminal.
+func IsTerminal(fd uintptr) bool {
+	var termios syscall.Termios
+	_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, fd, ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0)
+	return err == 0
+}

Godeps/_workspace/src/github.com/mattn/go-isatty/isatty_linux.go

+// +build linux
+
+package isatty
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+const ioctlReadTermios = syscall.TCGETS
+
+// IsTerminal return true if the file descriptor is terminal.
+func IsTerminal(fd uintptr) bool {
+	var termios syscall.Termios
+	_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, fd, ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0)
+	return err == 0
+}

Godeps/_workspace/src/github.com/mattn/go-isatty/isatty_windows.go

+// +build windows
+
+package isatty
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+var kernel32 = syscall.NewLazyDLL("kernel32.dll")
+var procGetConsoleMode = kernel32.NewProc("GetConsoleMode")
+
+// IsTerminal return true if the file descriptor is terminal.
+func IsTerminal(fd uintptr) bool {
+	var st uint32
+	r, _, e := syscall.Syscall(procGetConsoleMode.Addr(), 2, fd, uintptr(unsafe.Pointer(&st)), 0)
+	return r != 0 && e == 0
+}

cmd/geth/main.go

@@ -23,14 +23,14 @@ package main
 import (
 	"bufio"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"os"
+	"path"
 	"runtime"
 	"strconv"
 	"time"
 
-	"path"
-
 	"github.com/codegangsta/cli"
 	"github.com/ethereum/ethash"
 	"github.com/ethereum/go-ethereum/accounts"
@@ -41,6 +41,8 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/eth"
 	"github.com/ethereum/go-ethereum/logger"
+	"github.com/mattn/go-colorable"
+	"github.com/mattn/go-isatty"
 	"github.com/peterh/liner"
 )
 import _ "net/http/pprof"
@@ -301,6 +303,14 @@ func run(ctx *cli.Context) {
 }
 
 func console(ctx *cli.Context) {
+	// Wrap the standard output with a colorified stream (windows)
+	if isatty.IsTerminal(os.Stdout.Fd()) {
+		if pr, pw, err := os.Pipe(); err == nil {
+			go io.Copy(colorable.NewColorableStdout(), pr)
+			os.Stdout = pw
+		}
+	}
+
 	cfg := utils.MakeEthConfig(ClientIdentifier, nodeNameVersion, ctx)
 	ethereum, err := eth.New(cfg)
 	if err != nil {