templates: make SongFileSize work with both Song and PendingSong

go.mod

@@ -20,6 +20,7 @@ require (
 	github.com/cenkalti/backoff v2.2.1+incompatible
 	github.com/cenkalti/backoff/v4 v4.3.0
 	github.com/davecgh/go-spew v1.1.1
+	github.com/dustin/go-humanize v1.0.1
 	github.com/go-chi/httprate v0.14.1
 	github.com/go-sql-driver/mysql v1.8.1
 	github.com/golang-migrate/migrate/v4 v4.18.1
@@ -96,7 +97,6 @@ require (
 	github.com/docker/docker v27.4.0+incompatible // indirect
 	github.com/docker/go-connections v0.5.0 // indirect
 	github.com/docker/go-units v0.5.0 // indirect
-	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/go-logr/logr v1.4.2 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect

templates/functions.go

@@ -32,8 +32,27 @@ func (sf *StatefulFuncs) Status() radio.Status {
 	return sf.status.Latest()
 }
 
-func (sf *StatefulFuncs) SongFileSize(song radio.Song) string {
-	path := util.AbsolutePath(sf.Conf().MusicPath, song.FilePath)
+func (sf *StatefulFuncs) SongFileSize(song any) string {
+	var path string
+	switch s := song.(type) {
+	case radio.Song:
+		path = s.FilePath
+	case *radio.Song:
+		if s != nil {
+			path = s.FilePath
+		}
+	case radio.PendingSong:
+		path = s.FilePath
+	case *radio.PendingSong:
+		if s != nil {
+			path = s.FilePath
+		}
+	default:
+		return "??? MiB"
+	}
+
+	// make the path absolute
+	path = util.AbsolutePath(sf.Conf().MusicPath, path)
 
 	fi, err := os.Stat(path)
 	if err != nil {