Move convenience methods to tag

id3.go

@@ -12,9 +12,8 @@ import (
 // File represents the tagged file
 type File struct {
 	*Tag
-	name                        string
+	name string
-	data                        []byte
+	data []byte
-	Title, Artist, Album, Genre string
 }
 
 // Opens a new tagged file
@@ -36,20 +35,11 @@ func Open(name string) (*File, error) {
 		tag,
 		name,
 		data,
-		tag.textFrame("TIT2"),
-		tag.textFrame("TPE1"),
-		tag.textFrame("TALB"),
-		tag.textFrame("TCON"),
 	}, nil
 }
 
 // Saves any edits to the tagged file
 func (f *File) Close() {
-	f.setTextFrame("TIT2", f.Title)
-	f.setTextFrame("TPE1", f.Artist)
-	f.setTextFrame("TALB", f.Album)
-	f.setTextFrame("TCON", f.Genre)
-
 	fi, err := os.Create(f.name)
 	defer fi.Close()
 	if err != nil {
@@ -60,25 +50,3 @@ func (f *File) Close() {
 	wr.Write(f.Tag.Bytes())
 	wr.Write(f.data)
 }
-
-func (t Tag) textFrame(id string) string {
-	if frame := t.Frame(id); frame != nil {
-		switch frame.(type) {
-		case (*TextFrame):
-			return frame.(*TextFrame).Text()
-		default:
-		}
-	}
-
-	return ""
-}
-
-func (t *Tag) setTextFrame(id, text string) {
-	if frame := t.Frame(id); frame != nil {
-		switch frame.(type) {
-		case (*TextFrame):
-			frame.(*TextFrame).SetText(text)
-		default:
-		}
-	}
-}

id3v2.go

@@ -142,6 +142,60 @@ type Header interface {
 	Bytes() []byte
 }
 
+func (t Tag) Title() string {
+	return t.textFrameText("TIT2")
+}
+
+func (t Tag) Artist() string {
+	return t.textFrameText("TPE1")
+}
+
+func (t Tag) Album() string {
+	return t.textFrameText("TALB")
+}
+
+func (t Tag) Genre() string {
+	return t.textFrameText("TCON")
+}
+
+func (t *Tag) SetTitle(text string) {
+	t.setTextFrameText("TIT2", text)
+}
+
+func (t *Tag) SetArtist(text string) {
+	t.setTextFrameText("TPE1", text)
+}
+
+func (t *Tag) SetAlbum(text string) {
+	t.setTextFrameText("TALB", text)
+}
+
+func (t *Tag) SetGenre(text string) {
+	t.setTextFrameText("TCON", text)
+}
+
+func (t Tag) textFrameText(id string) string {
+	if frame := t.Frame(id); frame != nil {
+		switch frame.(type) {
+		case (*TextFrame):
+			return frame.(*TextFrame).Text()
+		default:
+		}
+	}
+
+	return ""
+}
+
+func (t *Tag) setTextFrameText(id, text string) {
+	if frame := t.Frame(id); frame != nil {
+		switch frame.(type) {
+		case (*TextFrame):
+			frame.(*TextFrame).SetText(text)
+		default:
+		}
+	}
+}
+
 func NewHeader(reader io.Reader) Header {
 	data := make([]byte, HeaderSize)
 	n, err := io.ReadFull(reader, data)