implement sort.Interface for core.Feed

core/structs.go

@@ -92,6 +92,24 @@ func GofeedConvert(f *gofeed.Feed, title string) (*Feed, error) {
 	return new, nil
 }
 
+// Implement sort.Interface for Feed
+
+// Len returns the length of Items.
+func (f *Feed) Len() int {
+	return len(f.Items)
+}
+
+// Less compares Published of Items[i], Items[k] and returns true if Items[i] is
+// before Items[j].
+func (f *Feed) Less(i, j int) {
+	return f.Items[i].Published.Before(f.Items[j].Published)
+}
+
+// Swap swaps Items[i] and Items[j].
+func (f *Feed) Swap(i, j int) {
+	f.Items[i], f.Items[j] = f.Items[j], f.Items[i]
+}
+
 // Lock locks both feed and page mutexes.
 func (j *jsonData) Lock() {
 	j.feedsMu.Lock()