From 4534bc06f5f26f4b15f45b93eb904c98ffe7d272 Mon Sep 17 00:00:00 2001
From: John Estropia <rommel.estropia@gmail.com>
Date: Wed, 16 Jun 2021 23:28:46 +0900
Subject: [PATCH] Add utility for DiffableDataSources to create an empty
 snapshot for custom list construction

---
 Sources/DiffableDataSource.BaseAdapter.swift | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Sources/DiffableDataSource.BaseAdapter.swift b/Sources/DiffableDataSource.BaseAdapter.swift
index eae290b..bf04b22 100644
--- a/Sources/DiffableDataSource.BaseAdapter.swift
+++ b/Sources/DiffableDataSource.BaseAdapter.swift
@@ -154,6 +154,17 @@ extension DiffableDataSource {
                 completion: completion
             )
         }
+        
+        /**
+         Creates a new empty `ListSnapshot` suitable for building custom lists inside subclass implementations of `apply(_:animatingDifferences:completion:)`.
+         */
+        public func makeEmptySnapshot() -> ListSnapshot<O> {
+            
+            return .init(
+                diffableSnapshot: .init(),
+                context: self.dataStack.unsafeContext()
+            )
+        }
 
         /**
          Returns the number of sections