Implemented SPM support

Package.swift

@@ -0,0 +1,33 @@
+// swift-tools-version: 5.7
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "Delta",
+    platforms: [.iOS(.v14)],
+    products: [
+        // Products define the executables and libraries a package produces, and make them visible to other packages.
+        .library(
+            name: "Delta",
+            targets: ["Delta"]),
+    ],
+    dependencies: [
+        .package(url: "https://github.com/Quick/Quick", from: "5.0.0"),
+        .package(url: "https://github.com/Quick/Nimble", from: "10.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        .target(
+            name: "Delta",
+            dependencies: []),
+        .testTarget(
+            name: "DeltaTests",
+            dependencies: [
+                "Delta",
+                .product(name: "Quick", package: "quick"),
+                .product(name: "Nimble", package: "nimble")
+            ]),
+    ]
+)

sources/delta.swift → Sources/Delta/delta.swift

@@ -42,7 +42,7 @@ func generateSectionRecords<Section: DeltaSection>(from: [Section], to: [Section
   let records = changes(from: from, to: to)
   let recordsWithoutChange = records.filter { record in
     switch record {
-    case .change(_):
+    case .change(_, _):
       return false
     default:
       return true

sources/extensions/UICollectionViewDelta.swift → Sources/Delta/extensions/UICollectionViewDelta.swift

@@ -2,7 +2,7 @@ import UIKit
 
 public extension UICollectionView {
 
-  public typealias CollectionViewUpdateCallback = (_ from: IndexPath, _ to: IndexPath) -> Void
+    typealias CollectionViewUpdateCallback = (_ from: IndexPath, _ to: IndexPath) -> Void
 
   /// Perform updates on the collection view.
   ///
@@ -13,7 +13,7 @@ public extension UICollectionView {
   ///   Note: due to internals in UITableView’s and UICollecitonView’s we need
   ///   to query the cell using the old index path, and update the cell with 
   ///   data from the new index path.
-  public func performUpdates(_ records: [CollectionRecord], update: CollectionViewUpdateCallback? = nil) {
+    func performUpdates(_ records: [CollectionRecord], update: CollectionViewUpdateCallback? = nil) {
     self.performBatchUpdates({
       for record in records {
         switch record {

sources/extensions/UITableViewDelta.swift → Sources/Delta/extensions/UITableViewDelta.swift

@@ -2,7 +2,7 @@ import UIKit
 
 public extension UITableView {
 
-  public typealias TableViewUpdateCallback = (_ from: IndexPath, _ to: IndexPath) -> Void
+    typealias TableViewUpdateCallback = (_ from: IndexPath, _ to: IndexPath) -> Void
 
   /// Perform updates on the table view.
   ///
@@ -13,7 +13,7 @@ public extension UITableView {
   ///   Note: due to internals in UITableView’s and UICollecitonView’s we need
   ///   to query the cell using the old index path, and update the cell with
   ///   data from the new index path.
-  public func performUpdates(_ records: [CollectionRecord], update: TableViewUpdateCallback? = nil) {
+    func performUpdates(_ records: [CollectionRecord], update: TableViewUpdateCallback? = nil) {
     var changeRecords: [CollectionRecord] = []
 
     self.beginUpdates()

sources/processor.swift → Sources/Delta/processor.swift

@@ -10,7 +10,7 @@ func changes<Item: DeltaItem>(from: [Item], to: [Item]) -> [DeltaChange] where I
   typealias DeltaCache = [Item.DeltaIdentifier: (index: Int, item: Item)]
 
   func added(_ to: [Item], fromCache: DeltaCache) -> [DeltaChange] {
-    return to.enumerated().flatMap { (index, element) -> DeltaChange? in
+      return to.enumerated().compactMap { (index, element) -> DeltaChange? in
       if fromCache[element.deltaIdentifier] == nil {
         return .add(index: index)
       }
@@ -19,7 +19,7 @@ func changes<Item: DeltaItem>(from: [Item], to: [Item]) -> [DeltaChange] where I
   }
 
   func removed(_ from: [Item], toCache: DeltaCache) -> [DeltaChange] {
-    return from.enumerated().flatMap { (index, item) -> DeltaChange? in
+      return from.enumerated().compactMap { (index, item) -> DeltaChange? in
       if let cacheEntry = toCache[item.deltaIdentifier] {
         if cacheEntry.item != item {
           return .change(index: cacheEntry.index, from: index)

tests/delta_spec.swift → Tests/DeltaTests/delta_spec.swift

@@ -3,7 +3,7 @@ import Nimble
 @testable import Delta
 
 struct Section: DeltaSection, Equatable {
-
+ 
   let identifier: Int
   let items: [Model]
   var deltaIdentifier: Int { return self.identifier }