Adds iTunes episodic elements

item.go

@@ -18,6 +18,7 @@ import (
 // - Title
 // - Description
 // - Enclosure (HREF, Type and Length all required)
+// - IEpisode (iTunes episode number)
 //
 // Recommendations:
 // - Setting the minimal fields sets most of other fields, including iTunes.
@@ -41,6 +42,7 @@ type Item struct {
 
 	// https://help.apple.com/itc/podcasts_connect/#/itcb54353390
 	IAuthor            string `xml:"itunes:author,omitempty"`
+		IEpisode            int `xml:"itunes:episode"`
 	ISubtitle          string `xml:"itunes:subtitle,omitempty"`
 	ISummary           *ISummary
 	IImage             *IImage

podcast.go

@@ -52,7 +52,7 @@ type Podcast struct {
 	INewFeedURL string  `xml:"itunes:new-feed-url,omitempty"`
 	IOwner      *Author // Author is formatted for itunes as-is
 	ICategories []*ICategory
-
+	IType string `xml:"itunes:type,omitempty"`
 	Items []*Item
 
 	encode func(w io.Writer, o interface{}) error
@@ -72,7 +72,7 @@ func New(title, link, description string,
 		PubDate:       parseDateRFC1123Z(pubDate),
 		LastBuildDate: parseDateRFC1123Z(lastBuildDate),
 		Language:      "en-us",
-
+		IType: "episodic",
 		// setup dependency (could inject later)
 		encode: encoder,
 	}
@@ -328,6 +328,12 @@ func (p *Podcast) AddItem(i Item) (int, error) {
 	}
 
 	p.Items = append(p.Items, &i)
+
+	//if episode number is not passed; we will just increase the items by one
+	if i.IEpisode == 0 && p.IType == "episodic" {
+		i.IEpisode = len(p.Items) + 1 
+	}
+	
 	return len(p.Items), nil
 }
 
@@ -382,6 +388,21 @@ func (p *Podcast) AddSummary(summary string) {
 	}
 }
 
+// AddIType adds the specified type to the podcast to the podcast.
+func (p *Podcast) AddIType(iType string) {
+	if len(iType) == 0 {
+		return
+	}
+	
+	if iType == "serial" {
+		p.IType = "serial"
+		return
+	}
+
+	p.IType = "episodic"
+
+}
+
 // Bytes returns an encoded []byte slice.
 func (p *Podcast) Bytes() []byte {
 	return []byte(p.String())