You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: ls_formatting.go
    path of file: ./repos/podman/vendor/github.com/pkg/sftp
    
    the code of the file until where you have to start completion: package sftp

import (
	"errors"
	"fmt"
	"os"
	"os/user"
	"strconv"
	"time"

	sshfx "github.com/pkg/sftp/internal/encoding/ssh/filexfer"
)

func lsFormatID(id uint32) string {
	return strconv.FormatUint(uint64(id), 10)
}

type osIDLookup struct{}

func (osIDLookup) Filelist(*Request) (ListerAt, error) {
	return nil, errors.New("unimplemented stub")
}

func (osIDLookup) LookupUserName(uid string) string {
	u, err := user.LookupId(uid)
	if err != nil {
		return uid
	}

	return u.Username
}

func (o
    
func runLs(idLookup NameLookupFileLister, dirent os.FileInfo) string {
	// example from openssh sftp server:
	// crw-rw-rw-    1 root     wheel           0 Jul 31 20:52 ttyvd
	// format:
	// {directory / char device / etc}{rwxrwxrwx}  {number of links} owner group size month day [time (this year) | year (otherwise)] name

	symPerms := sshfx.FileMode(fromFileMode(dirent.Mode())).String()

	var numLinks uint64 = 1
	uid, gid := "0", "0"

	switch sys := dirent.Sys().(type) {
	case *sshfx.Attributes:
		uid = lsFormatID(sys.UID)
		gid = lsFormatID(sys.GID)
	case *FileStat:
		uid = lsFormatID(sys.UID)
		gid = lsFormatID(sys.GID)
	default:
		if fiExt, ok := dirent.(FileInfoUidGid); ok {
			uid = lsFormatID(fiExt.Uid())
			gid = lsFormatID(fiExt.Gid())

			break
		}

		numLinks, uid, gid = lsLinksUIDGID(dirent)
	}

	if idLookup != nil {
		uid, gid = idLookup.LookupUserName(uid), idLookup.LookupGroupName(gid)
	}

	mtime := dirent.ModTime()
	date := mtime.Format("Jan 2")

	var yearOrTime string
	if mtime.Before(time.Now().AddDate(0, -6, 0)) {
		yearOrTime = mtime.Format("2006")
	} else {
		yearOrTime = mtime.Format("15:04")
	}

	return fmt.Sprintf("%s %4d %-8s %-8s %8d %s %5s %s", symPerms, numLinks, uid, gid, dirent.Size(), date, yearOrTime, dirent.Name())
}