minio/cmd/update-notifier.go
Harshavardhana 62f8343879 Add constants for commonly used values. (#3588)
This is a consolidation effort, avoiding usage
of naked strings in codebase. Whenever possible
use constants which can be repurposed elsewhere.

This also fixes `goconst ./...` reported issues.
2017-01-18 12:24:34 -08:00

91 lines
3.1 KiB
Go

/*
* Minio Cloud Storage, (C) 2015 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"
"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.
hTime := timeDurationToHumanizedDuration(newerThan)
line1Str := fmt.Sprintf(" Minio is %s old ", hTime.StringShort())
line2Str := fmt.Sprintf(" Update: %s ", updateString)
line1Length := len(line1Str)
line2Length := len(line2Str)
// Populate lines with color coding.
line1InColor := fmt.Sprintf(" Minio is %s old ", yellow(hTime.StringShort()))
line2InColor := fmt.Sprintf(" Update: %s ", cyan(updateString))
// calculate the rectangular box size.
maxContentWidth := int(math.Max(float64(line1Length), float64(line2Length)))
line1Rest := maxContentWidth - line1Length
line2Rest := maxContentWidth - 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
}
var message string
switch {
case len(line2Str) > termWidth:
message = "\n" + line1InColor + "\n" + line2InColor + "\n"
default:
// on windows terminal turn off unicode characters.
var top, bottom, sideBar string
if runtime.GOOS == globalWindowsOSName {
top = yellow("*" + strings.Repeat("*", maxContentWidth) + "*")
bottom = yellow("*" + strings.Repeat("*", maxContentWidth) + "*")
sideBar = yellow("|")
} else {
// color the rectangular box, use unicode characters here.
top = yellow("┏" + strings.Repeat("━", maxContentWidth) + "┓")
bottom = yellow("┗" + strings.Repeat("━", maxContentWidth) + "┛")
sideBar = yellow("┃")
}
// fill spaces to the rest of the area.
spacePaddingLine1 := strings.Repeat(" ", line1Rest)
spacePaddingLine2 := strings.Repeat(" ", line2Rest)
// construct the final message.
message = "\n" + top + "\n" +
sideBar + line1InColor + spacePaddingLine1 + sideBar + "\n" +
sideBar + line2InColor + spacePaddingLine2 + sideBar + "\n" +
bottom + "\n"
}
// Return the final message.
return message
}