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// Copyright 2017 Frédéric Guillot. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
package opml
import (
"bufio"
"bytes"
"encoding/xml"
"log"
)
// Serialize returns a SubcriptionList in OPML format.
func Serialize(subscriptions SubcriptionList) string {
var b bytes.Buffer
writer := bufio.NewWriter(&b)
writer.WriteString(xml.Header)
opml := new(Opml)
opml.Version = "2.0"
for categoryName, subs := range groupSubscriptionsByFeed(subscriptions) {
outline := Outline{Text: categoryName}
for _, subscription := range subs {
outline.Outlines = append(outline.Outlines, Outline{
Title: subscription.Title,
Text: subscription.Title,
FeedURL: subscription.FeedURL,
SiteURL: subscription.SiteURL,
})
}
opml.Outlines = append(opml.Outlines, outline)
}
encoder := xml.NewEncoder(writer)
encoder.Indent(" ", " ")
if err := encoder.Encode(opml); err != nil {
log.Println(err)
return ""
}
return b.String()
}
func groupSubscriptionsByFeed(subscriptions SubcriptionList) map[string]SubcriptionList {
groups := make(map[string]SubcriptionList)
for _, subscription := range subscriptions {
groups[subscription.CategoryName] = append(groups[subscription.CategoryName], subscription)
}
return groups
}
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