Adding tags to RSS feeds

src/Orchard.Web/Modules/Orchard.Tags/Feeds/TagsFeedItemBuilder.cs

@@ -0,0 +1,27 @@
+using System.Linq;
+using System.Xml.Linq;
+using Orchard.ContentManagement;
+using Orchard.Core.Feeds;
+using Orchard.Core.Feeds.Models;
+using Orchard.Environment.Extensions;
+using Orchard.Tags.Models;
+
+namespace Orchard.Tags.Feeds {
+    [OrchardFeature("Orchard.Tags.Feeds")]
+    public class TagsFeedItemBuilder : IFeedItemBuilder {
+        public void Populate(FeedContext context) {
+            foreach (var feedItem in context.Response.Items.OfType<FeedItem<ContentItem>>()) {
+                // add to known formats
+                if (context.Format == "rss") {
+                    
+                    // adding tags to the rss item
+                    var tagsPart = feedItem.Item.As<TagsPart>();
+                    if (tagsPart != null) {
+                        tagsPart.CurrentTags.ToList().ForEach(x => 
+                            feedItem.Element.Add(new XElement("category", x)));
+                    }
+                }
+            }
+        }
+    }
+}

src/Orchard.Web/Modules/Orchard.Tags/Module.txt

@@ -10,3 +10,8 @@ Features:
         Description: The tags module is providing basic tagging for arbitrary content types. 
         Dependencies: Settings, Orchard.jQuery
         Category: Navigation
+    Orchard.Tags.Feeds:
+        Name: Tags Feeds
+        Description: Adds tags to the RSS feeds. 
+        Dependencies: Orchard.Tags, Feeds
+        Category: Syndication

src/Orchard.Web/Modules/Orchard.Tags/Orchard.Tags.csproj

@@ -67,6 +67,7 @@
   <ItemGroup>
     <Compile Include="AdminMenu.cs" />
     <Compile Include="Controllers\AdminController.cs" />
+    <Compile Include="Feeds\TagsFeedItemBuilder.cs" />
     <Compile Include="Migrations.cs" />
     <Compile Include="Models\ContentTagRecord.cs" />
     <Compile Include="Models\TagsPartRecord.cs" />