sort images in a 'natural sort' way

main.go

@@ -7,12 +7,14 @@ import (
 	"log"
 	"os"
 	"path/filepath"
+	"slices"
 	"strconv"
 	"strings"
 
 	"git.yetaga.in/alazyreader/why/filetypes"
 	"github.com/dblezek/tga"
 	"github.com/disintegration/imaging"
+	"github.com/maruel/natural"
 	"golang.org/x/image/webp"
 	tk "modernc.org/tk9.0"
 )
@@ -92,14 +94,20 @@ func newBrowse(file string) {
 		return
 	}
 	directoryState.images = []string{}
-	i := 0
 	for _, v := range dirfiles {
 		if filetypes.IsImage(v) {
 			directoryState.images = append(directoryState.images, v.Name())
-			if filepath.Join(directoryState.dir, v.Name()) == file {
-				directoryState.i = i
-			}
-			i++
+		}
+	}
+	slices.SortFunc(directoryState.images, func(a, b string) int {
+		if natural.Less(a, b) {
+			return -1
+		}
+		return 1
+	})
+	for i, v := range directoryState.images {
+		if v == file {
+			directoryState.i = i
 		}
 	}
 	updateImage(file)