Refactor Diffable Datasources out of the Sidebar

iOS/ShadowTableChanges.swift

@@ -0,0 +1,65 @@
+//
+//  ShadowTableChanges.swift
+//  NetNewsWire-iOS
+//
+//  Created by Maurice Parker on 10/20/21.
+//  Copyright © 2021 Ranchero Software. All rights reserved.
+//
+
+import Foundation
+
+public struct ShadowTableChanges {
+	
+	public struct Move: Hashable {
+		public var from: Int
+		public var to: Int
+		
+		init(_ from: Int, _ to: Int) {
+			self.from = from
+			self.to = to
+		}
+	}
+	
+	public var section: Int
+	public var deletes: Set<Int>?
+	public var inserts: Set<Int>?
+	public var moves: Set<Move>?
+	public var reloads: Set<Int>?
+	
+	public var isEmpty: Bool {
+		return (deletes?.isEmpty ?? true) && (inserts?.isEmpty ?? true) && (moves?.isEmpty ?? true) && (reloads?.isEmpty ?? true)
+	}
+	
+	public var isOnlyReloads: Bool {
+		return (deletes?.isEmpty ?? true) && (inserts?.isEmpty ?? true) && (moves?.isEmpty ?? true)
+	}
+	
+	public var deleteIndexPaths: [IndexPath]? {
+		guard let deletes = deletes else { return nil }
+		return deletes.map { IndexPath(row: $0, section: section) }
+	}
+	
+	public var insertIndexPaths: [IndexPath]? {
+		guard let inserts = inserts else { return nil }
+		return inserts.map { IndexPath(row: $0, section: section) }
+	}
+	
+	public var moveIndexPaths: [(IndexPath, IndexPath)]? {
+		guard let moves = moves else { return nil }
+		return moves.map { (IndexPath(row: $0.from, section: section), IndexPath(row: $0.to, section: section)) }
+	}
+	
+	public var reloadIndexPaths: [IndexPath]? {
+		guard let reloads = reloads else { return nil }
+		return reloads.map { IndexPath(row: $0, section: section) }
+	}
+	
+	init(section: Int, deletes: Set<Int>? = nil, inserts: Set<Int>? = nil, moves: Set<Move>? = nil, reloads: Set<Int>? = nil) {
+		self.section = section
+		self.deletes = deletes
+		self.inserts = inserts
+		self.moves = moves
+		self.reloads = reloads
+	}
+	
+}