gogs/modules/base/tool.go

// Copyright 2014 The Gogs Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package base

import (
	"crypto/md5"
	"encoding/hex"
	"fmt"
	"math"
	"strings"
	"time"
)

// Encode string to md5 hex value
func EncodeMd5(str string) string {
	m := md5.New()
	m.Write([]byte(str))
	return hex.EncodeToString(m.Sum(nil))
}

// Seconds-based time units
const (
	Minute = 60
	Hour   = 60 * Minute
	Day    = 24 * Hour
	Week   = 7 * Day
	Month  = 30 * Day
	Year   = 12 * Month
)

// TimeSince calculates the time interval and generate user-friendly string.
func TimeSince(then time.Time) string {
	now := time.Now()

	lbl := "ago"
	diff := now.Unix() - then.Unix()
	if then.After(now) {
		lbl = "from now"
		diff = then.Unix() - now.Unix()
	}

	switch {

	case diff <= 0:
		return "now"
	case diff <= 2:
		return fmt.Sprintf("1 second %s", lbl)
	case diff < 1*Minute:
		return fmt.Sprintf("%d seconds %s", diff, lbl)

	case diff < 2*Minute:
		return fmt.Sprintf("1 minute %s", lbl)
	case diff < 1*Hour:
		return fmt.Sprintf("%d minutes %s", diff/Minute, lbl)

	case diff < 2*Hour:
		return fmt.Sprintf("1 hour %s", lbl)
	case diff < 1*Day:
		return fmt.Sprintf("%d hours %s", diff/Hour, lbl)

	case diff < 2*Day:
		return fmt.Sprintf("1 day %s", lbl)
	case diff < 1*Week:
		return fmt.Sprintf("%d days %s", diff/Day, lbl)

	case diff < 2*Week:
		return fmt.Sprintf("1 week %s", lbl)
	case diff < 1*Month:
		return fmt.Sprintf("%d weeks %s", diff/Week, lbl)

	case diff < 2*Month:
		return fmt.Sprintf("1 month %s", lbl)
	case diff < 1*Year:
		return fmt.Sprintf("%d months %s", diff/Month, lbl)

	case diff < 18*Month:
		return fmt.Sprintf("1 year %s", lbl)
	}
	return then.String()
}

const (
	Byte  = 1
	KByte = Byte * 1024
	MByte = KByte * 1024
	GByte = MByte * 1024
	TByte = GByte * 1024
	PByte = TByte * 1024
	EByte = PByte * 1024
)

var bytesSizeTable = map[string]uint64{
	"b":  Byte,
	"kb": KByte,
	"mb": MByte,
	"gb": GByte,
	"tb": TByte,
	"pb": PByte,
	"eb": EByte,
}

func logn(n, b float64) float64 {
	return math.Log(n) / math.Log(b)
}

func humanateBytes(s uint64, base float64, sizes []string) string {
	if s < 10 {
		return fmt.Sprintf("%dB", s)
	}
	e := math.Floor(logn(float64(s), base))
	suffix := sizes[int(e)]
	val := float64(s) / math.Pow(base, math.Floor(e))
	f := "%.0f"
	if val < 10 {
		f = "%.1f"
	}

	return fmt.Sprintf(f+"%s", val, suffix)
}

// FileSize calculates the file size and generate user-friendly string.
func FileSize(s int64) string {
	sizes := []string{"B", "KB", "MB", "GB", "TB", "PB", "EB"}
	return humanateBytes(uint64(s), 1024, sizes)
}

// Subtract deals with subtraction of all types of number.
func Subtract(left interface{}, right interface{}) interface{} {
	var rleft, rright int64
	var fleft, fright float64
	var isInt bool = true
	switch left.(type) {
	case int:
		rleft = int64(left.(int))
	case int8:
		rleft = int64(left.(int8))
	case int16:
		rleft = int64(left.(int16))
	case int32:
		rleft = int64(left.(int32))
	case int64:
		rleft = left.(int64)
	case float32:
		fleft = float64(left.(float32))
		isInt = false
	case float64:
		fleft = left.(float64)
		isInt = false
	}

	switch right.(type) {
	case int:
		rright = int64(right.(int))
	case int8:
		rright = int64(right.(int8))
	case int16:
		rright = int64(right.(int16))
	case int32:
		rright = int64(right.(int32))
	case int64:
		rright = right.(int64)
	case float32:
		fright = float64(left.(float32))
		isInt = false
	case float64:
		fleft = left.(float64)
		isInt = false
	}

	if isInt {
		return rleft - rright
	} else {
		return fleft + float64(rleft) - (fright + float64(rright))
	}
}

// DateFormat pattern rules.
var datePatterns = []string{
	// year
	"Y", "2006", // A full numeric representation of a year, 4 digits   Examples: 1999 or 2003
	"y", "06", //A two digit representation of a year   Examples: 99 or 03

	// month
	"m", "01", // Numeric representation of a month, with leading zeros 01 through 12
	"n", "1", // Numeric representation of a month, without leading zeros   1 through 12
	"M", "Jan", // A short textual representation of a month, three letters Jan through Dec
	"F", "January", // A full textual representation of a month, such as January or March   January through December

	// day
	"d", "02", // Day of the month, 2 digits with leading zeros 01 to 31
	"j", "2", // Day of the month without leading zeros 1 to 31

	// week
	"D", "Mon", // A textual representation of a day, three letters Mon through Sun
	"l", "Monday", // A full textual representation of the day of the week  Sunday through Saturday

	// time
	"g", "3", // 12-hour format of an hour without leading zeros    1 through 12
	"G", "15", // 24-hour format of an hour without leading zeros   0 through 23
	"h", "03", // 12-hour format of an hour with leading zeros  01 through 12
	"H", "15", // 24-hour format of an hour with leading zeros  00 through 23

	"a", "pm", // Lowercase Ante meridiem and Post meridiem am or pm
	"A", "PM", // Uppercase Ante meridiem and Post meridiem AM or PM

	"i", "04", // Minutes with leading zeros    00 to 59
	"s", "05", // Seconds, with leading zeros   00 through 59

	// time zone
	"T", "MST",
	"P", "-07:00",
	"O", "-0700",

	// RFC 2822
	"r", time.RFC1123Z,
}

// Parse Date use PHP time format.
func DateParse(dateString, format string) (time.Time, error) {
	replacer := strings.NewReplacer(datePatterns...)
	format = replacer.Replace(format)
	return time.ParseInLocation(format, dateString, time.Local)
}

// Date takes a PHP like date func to Go's time format.
func DateFormat(t time.Time, format string) string {
	replacer := strings.NewReplacer(datePatterns...)
	format = replacer.Replace(format)
	return t.Format(format)
}

type Actioner interface {
	GetOpType() int
	GetActUserName() string
	GetRepoName() string
}

// ActionIcon accepts a int that represents action operation type
// and returns a icon class name.
func ActionIcon(opType int) string {
	switch opType {
	case 1: // Create repository.
		return "plus-circle"
	default:
		return "invalid type"
	}
}

const (
	CreateRepoTpl = `<a href="/user/%s">%s</a> created repository <a href="/%s/%s">%s</a>`
)

// ActionDesc accepts int that represents action operation type
// and returns the description.
func ActionDesc(act Actioner) string {
	actUserName := act.GetActUserName()
	repoName := act.GetRepoName()
	switch act.GetOpType() {
	case 1: // Create repository.
		return fmt.Sprintf(CreateRepoTpl, actUserName, actUserName, actUserName, repoName, repoName)
	default:
		return "invalid type"
	}
}