Add saving and loading

feed.go

@@ -1,8 +1,10 @@
 package rss
 
 import (
+	"encoding/gob"
 	"encoding/xml"
 	"fmt"
+	"os"
 	"sync"
 )
 
@@ -30,10 +32,6 @@ func initFeed() *Feed {
 		ContentNamespace: "http://purl.org/rss/1.0/modules/content/",
 	}
 
-	feed.wg.Add(1)
-	go feed.start()
-	feed.wg.Wait()
-
 	return feed
 }
 
@@ -52,9 +50,48 @@ func (f *Feed) check() error {
 }
 
 func NewFeed() *Feed {
-	return initFeed()
+	feed := initFeed()
+
+	feed.wg.Add(1)
+	go feed.start()
+	feed.wg.Wait()
+
+	return feed
 }
 
 func (f *Feed) AddChannel(c *Channel) {
 	f.addChannel <- c
 }
+
+func (f *Feed) Save(filename string) error {
+	file, err := os.Create(filename)
+	if err != nil {
+		return fmt.Errorf("error creating file %v: %v", filename, err)
+	}
+	defer file.Close()
+
+	if err := gob.NewEncoder(file).Encode(f); err != nil {
+		return fmt.Errorf("error encoding feed in file %v: %v", filename, err)
+	}
+
+	return nil
+}
+
+func OpenFeed(filename string) (*Feed, error) {
+	file, err := os.Open(filename)
+	if err != nil {
+		return nil, fmt.Errorf("error opening file %v: %v", filename, err)
+	}
+	defer file.Close()
+
+	feed := initFeed()
+	feed.wg.Add(1)
+	go feed.start()
+	feed.wg.Wait()
+
+	if err := gob.NewDecoder(file).Decode(feed); err != nil {
+		return nil, fmt.Errorf("error decoding file %v: %v", filename, err)
+	}
+
+	return nil, nil
+}

item.go

@@ -7,6 +7,11 @@ import (
 	"time"
 )
 
+type Content struct {
+	XMLName xml.Name `xml:"content:encoded"`
+	Value   string   `xml:",cdata"`
+}
+
 type Item struct {
 	addCategory chan string
 	XMLName     xml.Name `xml:"item"`
@@ -19,6 +24,7 @@ type Item struct {
 	Guid        string `xml:"guid,omitempty"`
 	PubDate     string `xml:"pubDate,omitempty"`
 	Source      *Source
+	Content     *Content
 	Categories  []string `xml:"category,omitempty"`
 	wg          sync.WaitGroup
 }