Postpone the cleanup of temporary files

WhatCopiedMac/Modules/Sources/FoundationExtensions/FileManager+Extension.swift

@@ -0,0 +1,16 @@
+//
+//  FileManager+Extension.swift
+//  WhatCopied
+//
+//  Created by cyan on 2024/12/11.
+//
+
+import Foundation
+
+public extension FileManager {
+  func directoryExists(at url: URL) -> Bool {
+    var isDirectory: ObjCBool = false
+    let fileExists = fileExists(atPath: url.path, isDirectory: &isDirectory)
+    return fileExists && isDirectory.boolValue
+  }
+}

WhatCopiedMac/Sources/AppDelegate.swift

@@ -39,6 +39,10 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
     }
   }
 
+  func applicationWillTerminate(_ notification: Notification) {
+    try? FileManager.default.removeItem(at: .previewingDirectory)
+  }
+
   func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
     true
   }

WhatCopiedMac/Sources/Controllers/MainVC+Data.swift

@@ -27,7 +27,7 @@ extension MainVC {
   }
 
   var previewingFileURL: URL {
-    URL.temporaryDirectory.appendingPathComponent(suggestedFileName)
+    .previewingDirectory.appendingPathComponent(suggestedFileName)
   }
 
   func reloadTypes() {

WhatCopiedMac/Sources/Controllers/MainVC.swift

@@ -70,8 +70,6 @@ final class MainVC: NSViewController {
   }
 
   override func endPreviewPanelControl(_ panel: QLPreviewPanel?) {
-    Task { @MainActor in
-      try? FileManager.default.removeItem(at: previewingFileURL)
-    }
+    // no-op
   }
 }

WhatCopiedMac/Sources/Extensions/URL+Extension.swift

@@ -0,0 +1,25 @@
+//
+//  URL+Extension.swift
+//  WhatCopied
+//
+//  Created by cyan on 2024/12/11.
+//
+
+import Foundation
+
+extension URL {
+  static var previewingDirectory: URL {
+    let directory = temporaryDirectory.appendingPathComponent("QuickLook")
+    let fileManager = FileManager.default
+
+    if !fileManager.directoryExists(at: directory) {
+      do {
+        try fileManager.createDirectory(at: directory, withIntermediateDirectories: false)
+      } catch {
+        Logger.log(.error, "Failed to create previewing directory: \(error.localizedDescription)")
+      }
+    }
+
+    return directory
+  }
+}