tag listing and item getting ready

Former-commit-id: f1134377a7afa6202c0f7180885912456add33fe

rss/feed.go

@@ -23,6 +23,27 @@ type Feed struct {
 	Tags          []string
 }
 
+func TaggedFeeds(tag string) ([]*Feed, error) {
+	db := config.Values().DB
+	feedNames, err := db.List([]string{nsFeeds})
+	if err != nil {
+		return nil, err
+	}
+	results := []*Feed{}
+	for _, feedName := range feedNames {
+		f := newFeed(feedName)
+		if err := f.Load(); err != nil {
+			return nil, err
+		}
+		for i := range f.Tags {
+			if f.Tags[i] == tag {
+				results = append(results, f)
+			}
+		}
+	}
+	return results, nil
+}
+
 func newFeed(key string) *Feed {
 	return &Feed{
 		Key: key,
@@ -102,6 +123,22 @@ func (f *Feed) save() error {
 	return db.Set(f.Key, b, nsFeeds)
 }
 
+func (f *Feed) Items(limit int) ([]*Item, error) {
+	keys, err := f.List(limit)
+	if err != nil {
+		return nil, err
+	}
+	results := []*Item{}
+	for j := range keys {
+		i := &Item{}
+		if err := i.Load(keys[j], f.Key); err != nil {
+			return nil, err
+		}
+		results = append(results, i)
+	}
+	return results, nil
+}
+
 func (f *Feed) List(limit int) ([]string, error) {
 	keys, err := config.Values().DB.List([]string{nsItems, f.Key})
 	if err != nil {