Add support for Atom 'replies' link relation

Show comments URL for Atom feeds as per RFC 4685.
See https://tools.ietf.org/html/rfc4685#section-4

Note that only the first link with type "text/html" is taken into consideration.

1 files changed, 11 insertions, 0 deletions

diff --git a/reader/atom/atom.go b/reader/atom/atom.go
index 517b43d..677f69a 100644
--- a/reader/atom/atom.go
+++ b/reader/atom/atom.go
@@ -99,6 +99,7 @@ func (a *atomEntry) Transform() *model.Entry {
 	entry.Content = getContent(a)
 	entry.Title = getTitle(a)
 	entry.Enclosures = getEnclosures(a)
+	entry.CommentsURL = getRelationURLWithType(a.Links, "replies", "text/html")
 	return entry
 }
 
@@ -126,6 +127,16 @@ func getRelationURL(links []atomLink, relation string) string {
 	return ""
 }
 
+func getRelationURLWithType(links []atomLink, relation, contentType string) string {
+	for _, link := range links {
+		if strings.ToLower(link.Rel) == relation && strings.ToLower(link.Type) == contentType {
+			return strings.TrimSpace(link.URL)
+		}
+	}
+
+	return ""
+}
+
 func getDate(a *atomEntry) time.Time {
 	// Note: The published date represents the original creation date for YouTube feeds.
 	// Example: