Fix issue with setting URL to the existing URL

Fixes #14

Author: sindresorhus

Sources/WallpaperCLI/main.swift

@@ -84,7 +84,7 @@ final class ScreensCommand: Command {
 
 let cli = CLI(
 	name: "wallpaper",
-	version: "2.0.0",
+	version: "1.3.0",
 	description: "Manage the desktop wallpaper"
 )
 

Sources/wallpaper/Wallpaper.swift

@@ -38,6 +38,8 @@ public struct Wallpaper {
 		case center
 	}
 
+	/// Works around macOS bug where it sometimes returns a directory instead of an image.
+	/// https://openradar.appspot.com/radar?id=4959084113559552
 	private static func getFromDirectory(_ url: URL) throws -> URL {
 		let appSupportDirectory = try FileManager.default.url(for: .applicationSupportDirectory, in: .userDomainMask, appropriateFor: nil, create: false)
 		let dbURL = appSupportDirectory.appendingPathComponent("Dock/desktoppicture.db")
@@ -60,6 +62,26 @@ public struct Wallpaper {
 		return try wallpaperURLs.map { $0.isDirectory ? try getFromDirectory($0) : $0 }
 	}
 
+	/// Works around a macOS bug where if you set a wallpaper to the same path as the existing wallpaper but with different content, it doesn't update.
+	/// https://openradar.appspot.com/radar?id=6095446787227648
+	private static func forceRefreshIfNeeded(_ image: URL, screen: Screen) throws {
+		var shouldSleep = false
+		let currentImages = try get(screen: screen)
+
+		for (index, nsScreen) in screen.nsScreens.enumerated() {
+			if image == currentImages[index] {
+				shouldSleep = true
+				try NSWorkspace.shared.setDesktopImageURL(URL(fileURLWithPath: ""), for: nsScreen, options: [:])
+			}
+		}
+
+		if shouldSleep {
+			// We need to sleep for a little bit, otherwise it doesn't take effect.
+			// It works with 0.3, but not with 0.2, so we're using 0.4 just to be sure.
+			sleep(for: 0.4)
+		}
+	}
+
 	/// Set an image URL as wallpaper
 	public static func set(_ image: URL, screen: Screen = .all, scale: Scale = .auto) throws {
 		var options = [NSWorkspace.DesktopImageOptionKey: Any]()
@@ -81,6 +103,8 @@ public struct Wallpaper {
 			options[.allowClipping] = false
 		}
 
+		try forceRefreshIfNeeded(image, screen: screen)
+
 		for nsScreen in screen.nsScreens {
 			try NSWorkspace.shared.setDesktopImageURL(image, for: nsScreen, options: options)
 		}

Sources/wallpaper/util.swift

@@ -1,5 +1,9 @@
 import AppKit
 
+func sleep(for duration: TimeInterval) {
+	usleep(useconds_t(duration * Double(USEC_PER_SEC)))
+}
+
 extension Collection {
 	/// Access a collection by index safely
 	subscript(safe index: Index) -> Element? {

readme.md

@@ -66,7 +66,7 @@ $ wallpaper get
 With Swift Package Manager:
 
 ```swift
-.package(url: "https://github.com/sindresorhus/macos-wallpaper", from: "2.0.0")
+.package(url: "https://github.com/sindresorhus/macos-wallpaper", from: "1.3.0")
 ```
 
 ### Usage
@@ -95,7 +95,7 @@ swift run wallpaper
 ### Build
 
 ```
-swift build --configuration=release
+swift build --configuration=release -Xswiftc -static-stdlib
 ```
 
 ### Generate Xcode project