shake_files2.go

package main

import (
	"fmt"
	"os"
	"log"
	"math/rand"
	"time"
	"flag"
	"regexp"
	"path"
	"strconv"
)


func main() {

	var dirname string
	var rename bool
	var rollback bool
	var renamedir bool
	flag.StringVar(&dirname,"p", ".", "path to directory with files")
	flag.BoolVar(&rename,"w", false, "Rename files (Default: Just print result without rename files)")
	flag.BoolVar(&rollback,"r", false, "Delete prefix in filenames if it exist")
	flag.BoolVar(&renamedir,"d", false, "Rename dirs too")
	flag.Parse()

	fdirname, err := os.Open(dirname)
	if err != nil {
		log.Fatal(err)
	}
	fnames, err := fdirname.Readdirnames(-1)
	if err != nil {
		log.Fatal(err)
	}

//Not shaked
//	for n,fname := range fnames {
//		fmt.Println(n,fname)
//	}
//	fmt.Println("Shaked:")

//shake
	var tmp string
	rsour := rand.New(rand.NewSource(time.Now().UnixNano()))
	for n,fname := range fnames {
		tmp = fname
		r := rsour.Intn(len(fnames)-1)
		fnames[n] = fnames[r]
		fnames[r] = tmp
	}

//show shaked

//	for n,fname := range fnames {
//		fmt.Println(n,fname)
//	}

	var number int

	for _,fname := range fnames {
		if ! renamedir {
			fi, err := os.Stat(path.Join(dirname,fname))
				if err != nil {
				log.Fatal(err)
			}
			if fi.Mode().IsDir() {
				continue
			}
		}
		prf := "$2"
		if ! rollback {
			prf = strconv.Itoa(number)
			prf += "RND-$2"
		}
		re := regexp.MustCompile(`^(\d+RND-)?(.+)$`)
		new_fname := re.ReplaceAllString(fname, prf)
		if rename {
			err = os.Rename(path.Join(dirname,fname),path.Join(dirname,new_fname))
			if err != nil {
				log.Fatal(err)
			}
		} else {
			fmt.Printf("%-50s --->       %s\n",path.Join(dirname,fname),path.Join(dirname,new_fname))
		}
		number++
	}
}