WIP prediction activity eligibility

FlintCore/Activities/ActivityEligibility.swift

@@ -19,10 +19,13 @@ public enum ActivityEligibility {
     case handoff
 
     /// Specify this to also register for Spotlight search when the activity is published.
-    /// - note: This is unusual. Normally you will index items for spotlight using Spotlight APIs.
+    /// - note: Normally you will index items for spotlight using Spotlight APIs.
     case search
 
     /// Specify this if the activity refers to publicly accessible content that should be indexed.
     /// - note: This requires a public web URL is set on the activity
     case publicIndexing
+
+    /// Allow the activity to qualify for Siri prediction
+    case prediction
 }

FlintCore/Activities/PublishCurrentActionActivityAction.swift

@@ -46,6 +46,12 @@ final class PublishCurrentActionActivityAction: Action {
         activity.isEligibleForHandoff = activityTypes.contains(.handoff)
         activity.isEligibleForPublicIndexing = activityTypes.contains(.publicIndexing)
 
+#if os(iOS) || os(watchOS)
+        if #available(iOS 12, watchOS 5, *) {
+            activity.isEligibleForPrediction = activityTypes.contains(.prediction)
+        }
+#endif
+
         // If the action provides some extra data, use this. Note that the prepareFunction has already been
         // essentially "curried" to capture the original `input` of the action being published.
         guard let preparedActivity = context.input.prepareFunction(activity) else {