A silly Go program to rename reports of golang show

golang-reports-rename.go

// A program to rename reports from github.com/LK4D4/report
// See https://github.com/LK4D4/report/issues/2

package main

import (
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"strings"
	"time"
)

const inPkg = "github.com/LK4D4/report/reports"

var (
	GoPath = os.Getenv("GOPATH")
	inDir  = filepath.Join(GoPath, "src", inPkg)
)

func main() {
	files, _ := ioutil.ReadDir(inDir)
	for _, file := range files {
		name := file.Name()
		if file.IsDir() || !strings.HasPrefix(name, "golang-") {
			continue
		}
		newName := newName(name)
		os.Rename(filepath.Join(inDir, file.Name()), filepath.Join(inDir, newName))
	}
}

func newName(name string) string {
	ext := filepath.Ext(name)
	splitted := strings.SplitN(
		strings.TrimSuffix(strings.TrimPrefix(name, "golang-"), ext), "-", 2)
	baseName := splitted[0]
	var sfx string
	if len(splitted) > 1 {
		sfx = "_" + splitted[1]
	}

	t, _ := time.Parse("Jan2", baseName)

	return fmt.Sprintf("golang-%02d-%02d%s%s", t.Month(), t.Day(), sfx, ext)
}