skip unsupported files

.gitignore

@@ -1 +1,2 @@
 /result
+/outputs

internal/ripsort.go

@@ -42,7 +42,12 @@ func Sort(dst, path string) {
 		os.Exit(1)
 	}
 
+	// Handle single file
 	if !info.IsDir() {
+		if !fileSupported(path) {
+			slog.Error("Unsupported file format", "file", path)
+			os.Exit(1)
+		}
 		if err := sortSong(path, dst); err != nil {
 			slog.Error("Failed to sort single file", "file", path, "err", err)
 			os.Exit(1)
@@ -50,6 +55,7 @@ func Sort(dst, path string) {
 		return
 	}
 
+	// Handle directory
 	err = filepath.WalkDir(path, func(p string, d fs.DirEntry, err error) error {
 		if err != nil {
 			slog.Error("Failed to walk path", "path", path, "file", p, "err", err)
@@ -57,6 +63,9 @@ func Sort(dst, path string) {
 		}
 
 		if !d.IsDir() {
+			if !fileSupported(p) {
+				return nil
+			}
 			if err := sortSong(p, dst); err != nil {
 				slog.Error("Failed to sort file", "file", p, "err", err)
 				return err

internal/sorter.go

@@ -9,6 +9,15 @@ import (
 	"strings"
 )
 
+func fileSupported(file string) bool {
+	supported := map[string]bool{
+		".mp3": true, ".flac": true,
+		".m4a": true, ".ogg": true, ".dsf": true,
+	}
+
+	return supported[strings.ToLower(filepath.Ext(file))]
+}
+
 func sortSong(src, dst string) error {
 	m, err := ReadAudioTags(src)
 	if err != nil {