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import AppKit
import Foundation
if CommandLine.arguments.count != 3 {
print("Must have 2 args")
exit(1)
}
let wallpaperDir = CommandLine.arguments[1]
let interval: TimeInterval = Double(CommandLine.arguments[2]) ?? 30.0
let workspace = NSWorkspace.shared
let imageExtensions: Set<String> = ["jpg", "jpeg", "png", "heic", "tiff", "gif", "bmp"]
func images() -> [URL] {
let dir = URL(fileURLWithPath: wallpaperDir, isDirectory: true)
let entries = (try? FileManager.default.contentsOfDirectory(
at: dir, includingPropertiesForKeys: nil)) ?? []
return entries.filter { imageExtensions.contains($0.pathExtension.lowercased()) }
}
var current: URL?
// setDesktopImageURL only touches the current Space (all displays).
func apply(_ url: URL?) {
guard let url else { return }
for screen in NSScreen.screens {
try? workspace.setDesktopImageURL(url, for: screen, options: [:])
}
}
func advance() {
let imgs = images()
guard !imgs.isEmpty else { return }
let pool = imgs.count > 1 ? imgs.filter { $0 != current } : imgs
current = pool.randomElement()
apply(current)
}
// Whenever you switch Space, repaint it to the current image.
workspace.notificationCenter.addObserver(
forName: NSWorkspace.activeSpaceDidChangeNotification,
object: nil, queue: .main
) { _ in apply(current) }
advance()
Timer.scheduledTimer(withTimeInterval: interval, repeats: true) { _ in advance() }
let app = NSApplication.shared
app.setActivationPolicy(.accessory) // no Dock icon
app.run()
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