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minio/cmd/update-notifier.go

93 lines
3.1 KiB

/*
* Minio Cloud Storage, (C) 2015, 2016, 2017 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 cmd
import (
"fmt"
"math"
"runtime"
"strings"
"time"
"github.com/cheggaaa/pb"
humanize "github.com/dustin/go-humanize"
"github.com/fatih/color"
)
// colorizeUpdateMessage - inspired from Yeoman project npm package https://github.com/yeoman/update-notifier
func colorizeUpdateMessage(updateString string, newerThan time.Duration) string {
// Initialize coloring.
cyan := color.New(color.FgCyan, color.Bold).SprintFunc()
yellow := color.New(color.FgYellow, color.Bold).SprintfFunc()
// Calculate length without color coding, due to ANSI color
// characters padded to actual string the final length is wrong
// than the original string length.
newerThanStr := humanize.Time(UTCNow().Add(newerThan))
line1Str := fmt.Sprintf(" You are running an older version of Minio released %s ", newerThanStr)
line2Str := fmt.Sprintf(" Update: %s ", updateString)
line1Length := len(line1Str)
line2Length := len(line2Str)
// Populate lines with color coding.
line1InColor := fmt.Sprintf(" You are running an older version of Minio released %s ", yellow(newerThanStr))
line2InColor := fmt.Sprintf(" Update: %s ", cyan(updateString))
// calculate the rectangular box size.
maxContentWidth := int(math.Max(float64(line1Length), float64(line2Length)))
// termWidth is set to a default one to use when we are
// not able to calculate terminal width via OS syscalls
termWidth := 25
if width, err := pb.GetTerminalWidth(); err == nil {
termWidth = width
}
// Box cannot be printed if terminal width is small than maxContentWidth
if maxContentWidth > termWidth {
return "\n" + line1InColor + "\n" + line2InColor + "\n" + "\n"
}
topLeftChar := "┏"
topRightChar := "┓"
bottomLeftChar := "┗"
bottomRightChar := "┛"
horizBarChar := "━"
vertBarChar := "┃"
// on windows terminal turn off unicode characters.
if runtime.GOOS == globalWindowsOSName {
topLeftChar = "+"
topRightChar = "+"
bottomLeftChar = "+"
bottomRightChar = "+"
horizBarChar = "-"
vertBarChar = "|"
}
message := "\n"
// Add top line
message += yellow(topLeftChar+strings.Repeat(horizBarChar, maxContentWidth)+topRightChar) + "\n"
// Add message lines
message += vertBarChar + line1InColor + strings.Repeat(" ", maxContentWidth-line1Length) + vertBarChar + "\n"
message += vertBarChar + line2InColor + strings.Repeat(" ", maxContentWidth-line2Length) + vertBarChar + "\n"
// Add bottom line
message += yellow(bottomLeftChar+strings.Repeat(horizBarChar, maxContentWidth)+bottomRightChar) + "\n"
return message
}