humanize.go

/*
Copyright 2017 WALLIX

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 console

import (
	"fmt"
	"time"
)

func HumanizeTime(t time.Time) string {
	d := time.Now().UTC().Sub(t)
	switch {
	case d.Seconds() <= time.Second.Seconds():
		return "now"
	case d.Seconds() <= 2*60*time.Second.Seconds():
		return fmt.Sprintf("%d secs", int(d.Seconds()))
	case d.Seconds() <= 2*60*time.Minute.Seconds():
		return fmt.Sprintf("%d mins", int(d.Minutes()))
	case d.Seconds() <= 2*24*time.Hour.Seconds():
		return fmt.Sprintf("%d hours", int(d.Hours()))
	case d.Seconds() <= 2*7*24*time.Hour.Seconds():
		return fmt.Sprintf("%d days", int(d.Hours()/24))
	case d.Seconds() <= 2*30*24*time.Hour.Seconds():
		return fmt.Sprintf("%d weeks", int(d.Hours()/(24*7)))
	case d.Seconds() <= 2*365*24*time.Hour.Seconds():
		return fmt.Sprintf("%d months", int(d.Hours()/(24*30)))
	default:
		return fmt.Sprintf("%d years", int(d.Hours()/(24*365)))
	}
}

type storageUnit uint

const (
	b storageUnit = iota
	kb
	mb
	gb
)

func HumanizeStorage(nb uint64, unit storageUnit) string {
	var nbBytes uint64
	switch unit {
	case b:
		nbBytes = nb
	case kb:
		nbBytes = nb * 1024
	case mb:
		nbBytes = nb * 1024 * 1024
	case gb:
		nbBytes = nb * 1024 * 1024 * 1024
	default:
		return "invalid storage unit"
	}
	switch {
	case nbBytes < 1024:
		return fmt.Sprintf("%dB", nbBytes)
	case nbBytes < 1024*1024:
		return fmt.Sprintf("%sK", divideValue(nbBytes, 1024))
	case nbBytes < 1024*1024*1024:
		return fmt.Sprintf("%sM", divideValue(nbBytes, 1024*1024))
	default:
		return fmt.Sprintf("%sG", divideValue(nbBytes, 1024*1024*1024))
	}
}

func divideValue(from, by uint64) string {
	res := from / by
	if from%by != 0 {
		return fmt.Sprintf("~%d", res)
	}
	return fmt.Sprint(res)
}