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")))
	c = index.Collect(g, index.ByPrefix("Name"))
	g = index.SubTransform(c, index.TrimEnumPrefix)
	g = index.SumGroupIntAttr("TotalTime", g)
	commonFields := []index.Attr{
		index.StringAttr("Album"),
		index.StringAttr("Artist"),
		index.StringAttr("AlbumArtist"),
		index.StringAttr("Composer"),
		index.IntAttr("Year"),
		index.IntAttr("BitRate"),
		index.IntAttr("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(index.StringAttr("TrackID"), g)

	return build(g, k), nil
}
Пример #2
0
func buildCollection(h group, c index.Collection) group {
	getField := func(f string, g index.Group, c index.Collection) interface{} {
		if g.Field(f) == c.Field(f) {
			return nil
		}
		return g.Field(f)
	}

	for _, k := range c.Keys() {
		g := c.Get(k)
		g = index.FirstTrackAttr(index.StringAttr("AlbumArtist"), g)
		g = index.CommonGroupAttr([]index.Attr{index.StringAttr("Artist")}, g)
		h.Groups = append(h.Groups, group{
			Name:        g.Name(),
			Key:         k,
			AlbumArtist: getField("AlbumArtist", g, c),
			Artist:      getField("Artist", g, c),
		})
	}
	return h
}