/*

* Minio Cloud Storage, (C) 2018 Minio, Inc.

*

* 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 logger

import (

"fmt"

"os"

"regexp"

"github.com/fatih/color"

isatty "github.com/mattn/go-isatty"

)

// Global colors.

var (

// Check if we stderr, stdout are dumb terminals, we do not apply

// ansi coloring on dumb terminals.

isTerminal = func() bool {

return isatty.IsTerminal(os.Stdout.Fd()) && isatty.IsTerminal(os.Stderr.Fd())

}

ColorBold = func() func(a ...interface{}) string {

if isTerminal() {

return color.New(color.Bold).SprintFunc()

}

return fmt.Sprint

}()

ColorFgRed = func() func(a ...interface{}) string {

if isTerminal() {

return color.New(color.FgRed).SprintFunc()

}

return fmt.Sprint

}()

ColorBgRed = func() func(format string, a ...interface{}) string {

if isTerminal() {

return color.New(color.BgRed).SprintfFunc()

}

return fmt.Sprintf

}()

ColorFgWhite = func() func(format string, a ...interface{}) string {

if isTerminal() {

return color.New(color.FgWhite).SprintfFunc()

}

return fmt.Sprintf

}()

)

var ansiRE = regexp.MustCompile("(\x1b[^m]*m)")

// Print ANSI Control escape

func ansiEscape(format string, args ...interface{}) {

var Esc = "\x1b"

fmt.Printf("%s%s", Esc, fmt.Sprintf(format, args...))

}

func ansiMoveRight(n int) {

if isTerminal() {

ansiEscape("[%dC", n)

}

}

func ansiSaveAttributes() {

if isTerminal() {

ansiEscape("7")

}

}

func ansiRestoreAttributes() {

if isTerminal() {

ansiEscape("8")

}

}