Пример #1
0
// Fetch returns a group from the collection with the given path.
func (l *Library) Fetch(c index.Collection, path []string) (group, error) {
	if len(path) == 0 {
		return build(c, index.Key("Root")), nil
	}

	var g index.Group = c
	k := index.Key(path[0])
	g = c.Get(k)

	if g == nil {
		return group{}, fmt.Errorf("invalid path: near '%v'", path[0])
	}

	index.Sort(g.Tracks(), index.MultiSort(index.SortByInt("DiscNumber"), index.SortByInt("TrackNumber")))
	g = index.Transform(g, index.SplitList("Artist", "AlbumArtist", "Composer"))
	c = index.Collect(g, index.ByPrefix("Name"))
	g = index.SubTransform(c, index.TrimEnumPrefix)
	g = index.SumGroupIntAttr("TotalTime", g)
	commonFields := []attr.Interface{
		attr.String("Album"),
		attr.Strings("Artist"),
		attr.Strings("AlbumArtist"),
		attr.Strings("Composer"),
		attr.Int("Year"),
		attr.Int("BitRate"),
		attr.Int("DiscNumber"),
	}
	g = index.CommonGroupAttr(commonFields, g)
	g = index.RemoveEmptyCollections(g)

	for i, p := range path[1:] {
		var ok bool
		c, ok = g.(index.Collection)
		if !ok {
			return group{}, fmt.Errorf("retrieved Group is not a Collection")
		}

		k = index.Key(p)
		g = c.Get(k)
		if g == nil {
			return group{}, fmt.Errorf("invalid path near '%v'", path[1:][i])
		}

		if _, ok = g.(index.Collection); !ok {
			if i == len(path[1:])-1 {
				break
			}
			return group{}, fmt.Errorf("retrieved Group isn't a Collection: %v", p)
		}
	}
	if g == nil {
		return group{}, fmt.Errorf("could not find group")
	}
	g = index.FirstTrackAttr(attr.String("ID"), g)

	return build(g, k), nil
}
Пример #2
0
func buildRootCollection(l index.Library) index.Collection {
	root := index.Collect(l, index.By(attr.String("Album")))
	index.SortKeysByGroupName(root)
	return root
}