From 38954448cb4a4d2f3f37b0e6413ebc1b83ccce05 Mon Sep 17 00:00:00 2001
From: Brent Simmons <brent@ranchero.com>
Date: Wed, 15 Nov 2017 13:25:43 -0800
Subject: [PATCH] Move BatchUpdate.swift to RSCore.

---
 .../RSCore/RSCore.xcodeproj/project.pbxproj   |  6 ++
 Frameworks/RSCore/RSCore/BatchUpdate.swift    | 65 +++++++++++++++++++
 2 files changed, 71 insertions(+)
 create mode 100644 Frameworks/RSCore/RSCore/BatchUpdate.swift

diff --git a/Frameworks/RSCore/RSCore.xcodeproj/project.pbxproj b/Frameworks/RSCore/RSCore.xcodeproj/project.pbxproj
index 8f2b11548..04bda9754 100755
--- a/Frameworks/RSCore/RSCore.xcodeproj/project.pbxproj
+++ b/Frameworks/RSCore/RSCore.xcodeproj/project.pbxproj
@@ -7,6 +7,8 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		8402047E1FBCE77900D94C1A /* BatchUpdate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8402047D1FBCE77900D94C1A /* BatchUpdate.swift */; };
+		8402047F1FBCE77900D94C1A /* BatchUpdate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8402047D1FBCE77900D94C1A /* BatchUpdate.swift */; };
 		84134D1F1C59D5450063FD24 /* NSCalendar+RSCore.h in Headers */ = {isa = PBXBuildFile; fileRef = 84134D1D1C59D5450063FD24 /* NSCalendar+RSCore.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		84134D201C59D5450063FD24 /* NSCalendar+RSCore.m in Sources */ = {isa = PBXBuildFile; fileRef = 84134D1E1C59D5450063FD24 /* NSCalendar+RSCore.m */; };
 		8414CBA71C95F2EA00333C12 /* Set+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8414CBA61C95F2EA00333C12 /* Set+Extensions.swift */; };
@@ -165,6 +167,7 @@
 /* End PBXContainerItemProxy section */
 
 /* Begin PBXFileReference section */
+		8402047D1FBCE77900D94C1A /* BatchUpdate.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = BatchUpdate.swift; path = RSCore/BatchUpdate.swift; sourceTree = "<group>"; };
 		84134D1D1C59D5450063FD24 /* NSCalendar+RSCore.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "NSCalendar+RSCore.h"; sourceTree = "<group>"; };
 		84134D1E1C59D5450063FD24 /* NSCalendar+RSCore.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = "NSCalendar+RSCore.m"; sourceTree = "<group>"; };
 		8414CBA61C95F2EA00333C12 /* Set+Extensions.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "Set+Extensions.swift"; sourceTree = "<group>"; };
@@ -332,6 +335,7 @@
 				84A835891D4EC7B80004C598 /* PlistProviderProtocol.swift */,
 				842E45CB1ED623C7000A8B52 /* UniqueIdentifier.swift */,
 				84E34DA51F9FA1070077082F /* UndoableCommand.swift */,
+				8402047D1FBCE77900D94C1A /* BatchUpdate.swift */,
 				84CFF5241AC3C8A200CEA6C8 /* Foundation */,
 				84CFF5551AC3CF4A00CEA6C8 /* AppKit */,
 				84CFF5661AC3D13F00CEA6C8 /* Images */,
@@ -682,6 +686,7 @@
 				842DD7C61E14995C00E061EB /* RSBlocks.m in Sources */,
 				842DD7DD1E14996300E061EB /* NSDate+RSCore.m in Sources */,
 				84B99C951FAE64D500ECDEDB /* DisplayNameProvider.swift in Sources */,
+				8402047F1FBCE77900D94C1A /* BatchUpdate.swift in Sources */,
 				842DD7E91E14996300E061EB /* NSNotificationCenter+RSCore.m in Sources */,
 				842DD7E71E14996300E061EB /* NSMutableSet+RSCore.m in Sources */,
 				842DD7E31E14996300E061EB /* NSMutableArray+RSCore.m in Sources */,
@@ -711,6 +716,7 @@
 				84CFF54C1AC3CDAC00CEA6C8 /* NSString+RSCore.m in Sources */,
 				84CFF5171AC3C73000CEA6C8 /* RSConstants.m in Sources */,
 				8432B1881DACA2060057D6DF /* NSWindow-Extensions.swift in Sources */,
+				8402047E1FBCE77900D94C1A /* BatchUpdate.swift in Sources */,
 				84CFF5541AC3CF4700CEA6C8 /* NSColor+RSCore.m in Sources */,
 				84536F671BB856D4001E1639 /* NSFileManager+RSCore.m in Sources */,
 				8415CB8B1BF84D24007B1E98 /* NSEvent+RSCore.m in Sources */,
diff --git a/Frameworks/RSCore/RSCore/BatchUpdate.swift b/Frameworks/RSCore/RSCore/BatchUpdate.swift
new file mode 100644
index 000000000..37f41d1b3
--- /dev/null
+++ b/Frameworks/RSCore/RSCore/BatchUpdate.swift
@@ -0,0 +1,65 @@
+//
+//  BatchUpdates.swift
+//  DataModel
+//
+//  Created by Brent Simmons on 9/12/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+import Foundation
+
+public typealias BatchUpdateBlock = () -> Void
+
+public extension Notification.Name {
+	
+	public static let BatchUpdateDidPerform = Notification.Name(rawValue: "BatchUpdateDidPerform")
+}
+
+public final class BatchUpdate {
+	
+	public static let shared = BatchUpdate()
+	
+	private var count = 0
+	
+	public var isPerforming: Bool {
+		get {
+			return count > 0
+		}
+	}
+	
+	public func perform(_ batchUpdateBlock: BatchUpdateBlock) {
+		
+		incrementCount()
+		batchUpdateBlock()
+		decrementCount()
+	}
+}
+
+private extension BatchUpdate {
+	
+	func incrementCount() {
+		
+		count = count + 1
+	}
+	
+	func decrementCount() {
+		
+		count = count - 1
+		
+		if count < 1 {
+			
+			if count < 0 {
+				assertionFailure("Expected batch updates count to be 0 or greater.")
+				count = 0
+			}
+			
+			count = 0
+			postBatchUpdateDidPerform()
+		}
+	}
+	
+	func postBatchUpdateDidPerform() {
+		
+		NotificationCenter.default.post(name: .BatchUpdateDidPerform, object: nil, userInfo: nil)
+	}
+}