Script To reformat all directories in a directory tree from $PWD/01-02-2006* -> $PWD/2006-01-02

date_fixup.go

package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"path/filepath"
	"strings"
	"time"
)

const dateFormatOld = "01-02-2006"
const dateFormatFix = "2006-01-02"

func main() {
	wd, err := os.Getwd()
	if err != nil {
		log.Fatal(err)
	}

	directories := make([]string, 0, 20)

	err = filepath.Walk(wd, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		if info.IsDir() {
			if path == wd {
				return err
			}

			scanner := bufio.NewScanner(strings.NewReader(info.Name()))
			scanner.Split(bufio.ScanWords)

			for scanner.Scan() {
				token := scanner.Text()

				if strings.Count(token, "-") != 2 {
					log.Fatal("unexpected Directory Format: ", info.Name())
				}

				directories = append(directories, info.Name())
				break
			}
		}
		return err
	})
	if err != nil {
		log.Fatal(err)
	}

	directoriesFixed := make([]string, 0, len(directories))

	for _, d := range directories {
		scanner := bufio.NewScanner(strings.NewReader(d))
		scanner.Split(bufio.ScanWords)

		var nameFixed string

		if !scanner.Scan() {
			log.Fatal("unexpected scan of empty string")
		} else {
			dateToken := scanner.Text()
			dateOld, err := time.Parse(dateFormatOld, dateToken)
			if err != nil {
				log.Fatal(err)
			}

			nameFixed = dateOld.Format(dateFormatFix)
		}

		for scanner.Scan() {
			nameFixed += " " + scanner.Text()
		}

		directoriesFixed = append(directoriesFixed, nameFixed)
	}

	if len(directories) != len(directoriesFixed) {
		log.Fatal("invalid fixed directory names array")
	}

	for i, _ := range directoriesFixed {
		fmt.Printf("Renaming:\n%s ->\n%s\n", directories[i], directoriesFixed[i])
		err := os.Rename(directories[i], directoriesFixed[i])
		if err != nil {
			log.Fatal(err)
		}
	}
}