Create FeedlyUtilities and FeedlyUtilitiesTests.

Feedly/Sources/Feedly/FeedlyUtilities.swift

@@ -0,0 +1,34 @@
+//
+//  FeedlyUtilities.swift
+//
+//
+//  Created by Brent Simmons on 5/17/24.
+//
+
+import Foundation
+import Parser
+
+final class FeedlyUtilities {
+
+	static func parsedItemsKeyedByFeedURL(_ parsedItems: Set<ParsedItem>) -> [String: Set<ParsedItem>] {
+
+		var d = [String: Set<ParsedItem>]()
+
+		for parsedItem in parsedItems {
+			let key = parsedItem.feedURL
+
+			let value: Set<ParsedItem> = {
+				if var items = d[key] {
+					items.insert(parsedItem)
+					return items
+				} else {
+					return [parsedItem]
+				}
+			}()
+
+			d[key] = value
+		}
+
+		return d
+	}
+}