Add serializing RSS items and change NewFeed to New

rss/item.go

@@ -1,6 +1,8 @@
 package rss
 
 import (
+	"bytes"
+	"encoding/gob"
 	"fmt"
 	"html"
 	"io/ioutil"
@@ -32,6 +34,21 @@ func (item *Item) ID() string {
 	return strings.Join(regexp.MustCompile("[a-zA-Z0-9]*").FindAllString(item.Link, -1), "_")
 }
 
+func DeserializeItem(src []byte) (*Item, error) {
+	buffer := bytes.NewBuffer(src)
+	dec := gob.NewDecoder(buffer)
+	var dst Item
+	err := dec.Decode(&dst)
+	return &dst, err
+}
+
+func (item *Item) Serialize() ([]byte, error) {
+	var buffer bytes.Buffer
+	enc := gob.NewEncoder(&buffer)
+	err := enc.Encode(item)
+	return buffer.Bytes(), err
+}
+
 func fromGofeedItem(gfitem *gofeed.Item, filter string) *Item {
 	item := &Item{
 		Name:    gfitem.Title,