macOS installed apps information

MacOSAppsInfoFetcher.swift

    class MacOSAppsInfoFetcher {
        
        var query: NSMetadataQuery? {
            willSet {
                if let query = self.query {
                    query.stop()
                }
            }
        }

        public func doSpotlightQuery() {
            query = NSMetadataQuery()
            let predicate = NSPredicate(format: "kMDItemContentType == 'com.apple.application-bundle'")
            NotificationCenter.default.addObserver(self,
                                                   selector: #selector(queryDidFinish),
                                                   name: NSNotification.Name.NSMetadataQueryDidFinishGathering,
                                                   object: nil)
            query?.predicate = predicate
            query?.start()
        }

        @objc public func queryDidFinish(_ notification: NSNotification) {
            guard let query = notification.object as? NSMetadataQuery else {
                return
            }

            for result in query.results {
                guard let item = result as? NSMetadataItem else {
                    print("Result was not an NSMetadataItem, \(result)")
                    continue
                }
    //            item.attributes - for more attributes
                print(item.value(forAttribute: kMDItemDisplayName as String) ?? "unknown")
                print(item.value(forAttribute: kMDItemCFBundleIdentifier as String) ?? "unknown")
            }
        }
    }