v5.9

backend/filename.go

@@ -0,0 +1,46 @@
+package backend
+
+import (
+	"fmt"
+	"regexp"
+	"strings"
+)
+
+// BuildExpectedFilename builds the expected filename based on track metadata and settings
+func BuildExpectedFilename(trackName, artistName, filenameFormat string, includeTrackNumber bool, position int, useAlbumTrackNumber bool) string {
+	// Sanitize track name and artist name
+	safeTitle := sanitizeFilename(trackName)
+	safeArtist := sanitizeFilename(artistName)
+
+	var filename string
+
+	// Build base filename based on format
+	switch filenameFormat {
+	case "artist-title":
+		filename = fmt.Sprintf("%s - %s", safeArtist, safeTitle)
+	case "title":
+		filename = safeTitle
+	default: // "title-artist"
+		filename = fmt.Sprintf("%s - %s", safeTitle, safeArtist)
+	}
+
+	// Add track number prefix if enabled
+	// Note: We can't determine the exact track number without fetching from API
+	// So we only add it if position > 0 (bulk download)
+	if includeTrackNumber && position > 0 {
+		filename = fmt.Sprintf("%02d. %s", position, filename)
+	}
+
+	return filename + ".flac"
+}
+
+// sanitizeFilename removes invalid characters from filename
+func sanitizeFilename(name string) string {
+	re := regexp.MustCompile(`[<>:"/\\|?*]`)
+	sanitized := re.ReplaceAllString(name, "_")
+	sanitized = strings.TrimSpace(sanitized)
+	if sanitized == "" {
+		return "Unknown"
+	}
+	return sanitized
+}