How to format a duration - go

Question

I have the following code which I can't run on play because I use the gin framework and filewalk.
package main
import (
"fmt"
"os"
"path/filepath"
"time"
"regexp"
"github.com/gin-gonic/gin"
"sort"
"strings"
"github.com/davidscholberg/go-durationfmt"
)
var filext = regexp.MustCompile(`\.[mM][pP]4|\.[mM]4[vV]|\.jpg|\.[hH]264|\.go`)
var m map[int]string
var keys []int
func main() {
if gin.IsDebugging() {
fmt.Print("This progamm shows only the path and the age of a file in 'STARTDIR'\n")
fmt.Print("only the following files will be handled '.[mM][pP]4|.[mM]4[vV$|.[hH]264|.go'\n")
fmt.Print("The git repository: https://gitlab.com/aleks001/show-files-age \n")
}
if len(os.Getenv("LISTEN_IP_PORT")) == 0 {
fmt.Print("I need a ip and port on which I should listen.\n")
os.Exit(1)
}
router := gin.Default()
gin.DisableConsoleColor()
router.GET("/videoinfo",getInfo)
router.Run(os.Getenv("LISTEN_IP_PORT"))
}
func getInfo(c *gin.Context) {
loc, _ := time.LoadLocation("Europe/Vienna")
var startdir = ""
if os.Getenv("STARTDIR") != "" {
startdir = os.Getenv("STARTDIR")
} else if c.GetHeader("STARTDIR") != "" {
startdir = c.GetHeader("STARTDIR")
} else {
c.String(404,"Startdir not found <br>\n")
return
}
m = make(map[int]string)
keys = nil
filepath.Walk(startdir,walkpath)
for k := range m {
keys = append(keys, k)
}
sort.Ints(keys)
for _, k := range keys {
t := time.Date(time.Now().Year(),time.Now().Month(),time.Now().Day(),time.Now().Hour(),k,time.Now().Second(),time.Now().Nanosecond(),loc)
durStr, err := durationfmt.Format(time.Since(t), "%h:%m")
if err != nil {
fmt.Println(err)
} else {
//fmt.Println(durStr)
fmt.Printf("Key: %s Value: %s\n", durStr , m[k])
c.String(200,"Minutes: %s File: %s\n", durStr, m[k])
}
}
}
func walkpath(path string, f os.FileInfo, err error) error {
if err != nil {
fmt.Println(err)
} else {
if filext.MatchString(path) {
age := time.Now().Sub(f.ModTime())
path_new := strings.Replace(path,"/videos/","",1)
// path_new := strings.Replace(path,"..\\","",1)
/*
fmt.Printf("Path: %s, ModTime: %s, Age: %s <br>\n", walker.Path(), walker.Stat().ModTime(), age)
c.String(200,"Path: %s, ModTime: %s, Age: %s <br>\n", walker.Path(), walker.Stat().ModTime(), age)
*/
fmt.Printf("Path: %s, Age: %d age minutes %0.2f <br>\n", path_new, age, age.Minutes())
m[int(age.Minutes())]=path_new
//c.String(200,"Path: %s, Age: %0.2f <br>\n", path, age.Minutes())
}
//fmt.Printf("%s with %d bytes at motime %s\n", path,f.Size(), f.ModTime())
}
return nil
}
What I want to do is a sorted output of files based on filext als filter and the modtime as sort criteria.
I was able to fulfil the most part of the request but the output looks ugly as you can see below.
I have used https://github.com/davidscholberg/go-durationfmt to format the duration but the output looks ugly or I missus the library.
Minutes: 0:6 File: upload/dir003/file1.m4v
Minutes: 0:5 File: transfer/dir5/file2.jpg
Minutes: -5:-48 File: transfer/dir001/file.mp4
Minutes: -6:-21 File: transfer/03.jpg
Minutes: -6:-22 File: transfer/02.mp4

Answer 1

FYI, if you just want to quickly display a duration, the built-in formatting works well:
fmt.Sprintf("duration: %s", d)
will display something like this:
duration: 7h3m45s

Answer 2

For example, to provide a custom format for a duration,
package main
import (
"fmt"
"time"
)
func fmtDuration(d time.Duration) string {
d = d.Round(time.Minute)
h := d / time.Hour
d -= h * time.Hour
m := d / time.Minute
return fmt.Sprintf("%02d:%02d", h, m)
}
func main() {
modTime := time.Now().Round(0).Add(-(3600 + 60 + 45) * time.Second)
since := time.Since(modTime)
fmt.Println(since)
durStr := fmtDuration(since)
fmt.Println(durStr)
}
Playground: https://play.golang.org/p/HT4bFfoA5r
Output:
1h1m45s
01:02
If you want to sort on a duration then use the Go sort package. I would sort on ModTime to defer the calculation of the duration, Since(ModTime), to be accurate at the time it is printed. For example,
package main
import (
"fmt"
"os"
"path/filepath"
"sort"
"strings"
"time"
)
func isVideo(path string) bool {
videos := []string{".mp4", ".m4v", ".h264"}
ext := strings.ToLower(filepath.Ext(path))
for _, video := range videos {
if ext == video {
return true
}
}
return false
}
type modTimeInfo struct {
path string
modTime time.Time
}
func walkModTime(root string) ([]modTimeInfo, error) {
var infos []modTimeInfo
err := filepath.Walk(
root,
func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.Mode().IsRegular() {
path = filepath.Clean(path)
if !isVideo(path) {
return nil
}
sep := string(filepath.Separator)
dir := sep + `Videos` + sep
path = strings.Replace(path, dir, sep, 1)
infos = append(infos, modTimeInfo{
path: path,
modTime: info.ModTime()},
)
}
return nil
},
)
if err != nil {
return nil, err
}
return infos, nil
}
func sortModTime(infos []modTimeInfo) {
sort.SliceStable(
infos,
func(i, j int) bool {
return infos[i].modTime.Before(infos[j].modTime)
},
)
}
func fmtAge(d time.Duration) string {
d = d.Round(time.Minute)
h := d / time.Hour
d -= h * time.Hour
m := d / time.Minute
return fmt.Sprintf("%02d:%02d", h, m)
}
func main() {
root := `/home/peter/Videos` // Testing ...
infos, err := walkModTime(root)
if err != nil {
fmt.Println(err)
return
}
sortModTime(infos)
now := time.Now()
for _, info := range infos {
age := fmtAge(now.Sub(info.modTime))
fmt.Println("Age (H:M):", age, "File:", info.path)
}
}
Playground: https://play.golang.org/p/j2TUmJdAi4

Answer 3

Another way to format the duration if you don't care about the day, month or year
package main
import (
"fmt"
"time"
)
type Timespan time.Duration
func (t Timespan) Format(format string) string {
z := time.Unix(0, 0).UTC()
return z.Add(time.Duration(t)).Format(format)
}
func main() {
dur := 7777 * time.Second
fmt.Println(Timespan(dur).Format("15:04:05")) // 02:09:37
}
https://play.golang.org/p/XM-884oYMvE

Answer 4

Another easy way is to use the built in time.Duration String function.
duration.String()
Output: 28m26.550805438s
Or to round the seconds first
duration.Round(time.Second).String()
Output: 28m27s

Answer 5

Format yourself.
package main
import (
"fmt"
"time"
)
func main() {
d := 7777 * time.Second
hour := int(d.Seconds() / 3600)
minute := int(d.Seconds()/60) % 60
second := int(d.Seconds()) % 60
fmt.Printf("%d:%02d:%02d\n", hour, minute, second) // 02:09:37
}
https://go.dev/play/p/AFay62Qg2GB