exif-renamer.go

package main

import (
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"regexp"
)

func main() {
	files, err := ioutil.ReadDir(".")
	if err != nil {
		log.Fatalf("Could not read current directory: %v", err)
	}
	validName := regexp.MustCompile(`^((19|20)\d\d)-(0[1-9]|1[012])-(0[1-9]|[12]\d|3[01])_([01]\d|2[0-3])-([0-5]\d)-([0-5]\d).(jpg|jpeg)`)
	for _, f := range files {
		if !validName.MatchString(f.Name()) {
			continue
		}
		parts := validName.FindStringSubmatch(f.Name())
		y, month, d, h, minute, s, ext := parts[1], parts[3], parts[4], parts[5], parts[6], parts[7], parts[8]
		name := fmt.Sprintf("%s-%s-%s %s.%s.%s.%s", y, month, d, h, minute, s, ext)
		err := os.Rename(f.Name(), name)
		fmt.Printf("%s => %s  %v\n", f.Name(), name, err == nil)
	}
}