search genre if non is provided

internal/sorter.go

@@ -10,6 +10,7 @@ import (
 	"regexp"
 	"strings"
 
+	"git.kapelle.org/niklas/ripsort/internal/clients/musicbrainz"
 	"git.kapelle.org/niklas/ripsort/internal/metadata"
 )
 
@@ -42,6 +43,21 @@ func sortSong(src, dst string, updateMeta bool) error {
 	}
 
 	if updateMeta {
+		if len(m.Genre) == 0 {
+			slog.Debug("No genere found. Searching.", "file", src)
+			mb := musicbrainz.NewMusicBrainzClient()
+			genre, err := metadata.SearchForGenre(mb, m)
+			if err != nil {
+				slog.Warn("Failed to search genere in musicbrainz", "file", src, "err", err)
+			} else {
+				if len(genre) > 4 {
+					genre = genre[:4]
+				}
+				slog.Debug("Gound genere", "file", src, "genre", genre, "count", len(genre))
+				m.Genre = genre
+			}
+		}
+
 		slog.Info("Copying song with updated metadata", "file", src, "dst", dstPath)
 		err = copyFileUpdateMetadata(src, finalPath, *m)
 		if err != nil {