minio/cmd/update-notifier.go
2017-05-31 09:22:00 -07:00

104 lines
3.4 KiB
Go

/*
* 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"
)
// computeUpdateMessage - calculates the update message, only if a
// newer version is available.
func computeUpdateMessage(downloadURL string, older time.Duration) string {
if downloadURL == "" || older <= 0 {
return ""
}
// Compute friendly duration string to indicate time
// difference between newer and current release.
t := time.Time{}
newerThan := humanize.RelTime(t, t.Add(older), "ago", "")
// Return the nicely colored and formatted update message.
return colorizeUpdateMessage(downloadURL, newerThan)
}
// colorizeUpdateMessage - inspired from Yeoman project npm package https://github.com/yeoman/update-notifier
func colorizeUpdateMessage(updateString string, newerThan string) string {
// Initialize coloring.
cyan := color.New(color.FgCyan, color.Bold).SprintFunc()
yellow := color.New(color.FgYellow, color.Bold).SprintfFunc()
msgLine1Fmt := " You are running an older version of Minio released %s "
msgLine2Fmt := " Update: %s "
// Calculate length *without* color coding: with ANSI terminal
// color characters, the result is incorrect.
line1Length := len(fmt.Sprintf(msgLine1Fmt, newerThan))
line2Length := len(fmt.Sprintf(msgLine2Fmt, updateString))
// Populate lines with color coding.
line1InColor := fmt.Sprintf(msgLine1Fmt, yellow(newerThan))
line2InColor := fmt.Sprintf(msgLine2Fmt, 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 = "|"
}
lines := []string{
yellow(topLeftChar + strings.Repeat(horizBarChar, maxContentWidth) + topRightChar),
vertBarChar + line1InColor + strings.Repeat(" ", maxContentWidth-line1Length) + vertBarChar,
vertBarChar + line2InColor + strings.Repeat(" ", maxContentWidth-line2Length) + vertBarChar,
yellow(bottomLeftChar + strings.Repeat(horizBarChar, maxContentWidth) + bottomRightChar),
}
return "\n" + strings.Join(lines, "\n") + "\n"
}