refactor and cleanup [skip ci]

submodules/Postbox/Sources/OrderedItemListView.swift

@@ -0,0 +1,68 @@
+import Foundation
+
+final class MutableOrderedItemListView: MutablePostboxView {
+    let collectionId: Int32
+    var items: [OrderedItemListEntry]
+    
+    init(postbox: Postbox, collectionId: Int32) {
+        self.collectionId = collectionId
+        self.items = postbox.orderedItemListTable.getItems(collectionId: collectionId)
+    }
+    
+    func replay(postbox: Postbox, transaction: PostboxTransaction) -> Bool {
+        var updated = false
+        
+        if let operations = transaction.currentOrderedItemListOperations[self.collectionId] {
+            for operation in operations {
+                switch operation {
+                    case let .replace(items):
+                        self.items = items
+                        updated = true
+                    case let .addOrMoveToFirstPosition(item, maxCount):
+                        if let index = self.items.firstIndex(where: { $0.id == item.id }) {
+                            self.items.remove(at: index)
+                            self.items.insert(item, at: 0)
+                        } else {
+                            self.items.insert(item, at: 0)
+                            if let maxCount = maxCount, self.items.count > maxCount {
+                                self.items.removeLast()
+                            }
+                        }
+                        updated = true
+                    case let .remove(itemId):
+                        inner: for i in 0 ..< self.items.count {
+                            if self.items[i].id == itemId {
+                                self.items.remove(at: i)
+                                updated = true
+                                break inner
+                            }
+                        }
+                    case let .update(itemId, content):
+                        inner: for i in 0 ..< self.items.count {
+                            if self.items[i].id == itemId {
+                                self.items[i] = OrderedItemListEntry(id: itemId, contents: content)
+                                updated = true
+                                break inner
+                            }
+                        }
+                }
+            }
+        }
+        
+        return updated
+    }
+    
+    func immutableView() -> PostboxView {
+        return OrderedItemListView(self)
+    }
+}
+
+public final class OrderedItemListView: PostboxView {
+    public let collectionId: Int32
+    public let items: [OrderedItemListEntry]
+    
+    init(_ view: MutableOrderedItemListView) {
+        self.collectionId = view.collectionId
+        self.items = view.items
+    }
+}