Minor refactor

* Move namegen to seperate file
* Simplify Makefile

main.go

@@ -3,7 +3,6 @@ package main
 import (
 	"bytes"
 	"context"
-	"crypto/rand"
 	"embed"
 	"encoding/json"
 	"flag"
@@ -14,7 +13,6 @@ import (
 	"os"
 	"path"
 	"regexp"
-	"sync/atomic"
 	"time"
 
 	"log/slog"
@@ -27,7 +25,7 @@ import (
 var (
 	imagesDir      string
 	collageDir     string
-	localAssets    bool
+	devMode        bool
 	collageNameGen *nameGen
 	imagesDirFs    fs.FS
 	listenAddr     string
@@ -39,7 +37,7 @@ var (
 func main() {
 	flag.StringVar(&imagesDir, "images-dir", "images", "Sets the images dir")
 	flag.StringVar(&collageDir, "collages-dir", "collages", "Sets the collages dir")
-	flag.BoolVar(&localAssets, "local-assets", false, "Serve local assets during development")
+	flag.BoolVar(&devMode, "dev", false, "Serve local assets during development")
 	flag.StringVar(&listenAddr, "addr", "127.0.0.1:8767", "Web listen address, see https://pkg.go.dev/go.balki.me/anyhttp#readme-address-syntax")
 
 	flag.Parse()
@@ -57,7 +55,7 @@ func main() {
 	addFileServer(imagesURLPath, imagesDir)
 	addFileServer(collagesPath, collageDir)
 
-	if localAssets {
+	if devMode {
 		httpFileServer := http.FileServer(http.Dir("web"))
 		http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
 			w.Header().Add("Cache-Control", "no-cache")
@@ -131,39 +129,13 @@ func main() {
 	}
 }
 
-type nameGen struct {
-	prefix  string
-	counter atomic.Uint64
-}
-
-func NewNameGen() *nameGen {
-	currentTime := time.Now().Unix()
-	randBytes := make([]byte, 8)
-	_, err := rand.Read(randBytes)
-	if err != nil {
-		panic(err)
-	}
-	alpha := []byte("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
-	uniqRunID := ""
-	for _, b := range randBytes {
-		uniqRunID += string(alpha[int(b)%len(alpha)])
-	}
-	return &nameGen{
-		prefix:  fmt.Sprintf("%d-%s", currentTime, uniqRunID),
-		counter: atomic.Uint64{},
-	}
-}
-
-func (n *nameGen) Next() string {
-	return fmt.Sprintf("%s-%d", n.prefix, n.counter.Add(1))
-}
-
 func MakeCollage(req *collage.Request) (string, error) {
 	collageFile := fmt.Sprintf("collage-%s.jpg", collageNameGen.Next())
 	out, err := os.Create(path.Join(collageDir, collageFile))
 	if err != nil {
 		return "", fmt.Errorf("failed to create collage output file, err: %w", err)
 	}
+	defer out.Close()
 	if err := collage.Make(req, imagesDirFs, out); err != nil {
 		return "", fmt.Errorf("failed to make collage, err: %w", err)
 	}