Rename a bunch of files that were downloaded from S3 with really long names.

rename.go

package main

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

var (
	theDir = "/Users/darron/Desktop/Movies"
)

func main() {
	movieDir, err := ioutil.ReadDir(theDir)
	if err != nil {
		log.Fatal("Problem opening the directory.")
	}

	fileNames := getFileNames(movieDir)
	if fileNames == nil {
		log.Fatal("We have no files to deal with.")
	}

	splitNames(fileNames)
}

func getFileNames(files []os.FileInfo) []string {
	var names []string
	for _, file := range files {
		names = append(names, file.Name())
	}
	return names
}

func splitNames(files []string) {
	for _, v := range files {
		pieces := strings.Split(v, "?")
		originalPath := fmt.Sprintf("%s/%s", theDir, v)
		newPath := fmt.Sprintf("%s/%s", theDir, pieces[0])
		// fmt.Printf("Orig: %s\nNew: %s\n\n", originalPath, newPath)
		err := os.Rename(originalPath, newPath)
		if err != nil {
			log.Fatal("Oh boy.")
		}
	}
}