Filesystem monitor and refactor.

src/AboutViewController.swift

@@ -0,0 +1,211 @@
+import AppKit
+
+// TODO: Change to appropriate links.
+fileprivate enum AboutLinks {
+    // static let website = "https://cmdbar.app"
+    // static let documentation = "https://cmdbar.app/documentation"
+    // static let privacy = "https://cmdbar.app/#privacy-policy"
+    static let author = "https://kolokolnikov.org"
+}
+
+enum Strings {
+    static let copyright = "Copyright © 2024\nGarikMI. All rights reserved."
+    static let evaluationTitle = "License - Evaluation"
+    static let evaluationMessage = "You are currently using evaluation license. CmdBar will quit after 20 minutes. If you already own a license, enter it below or purchase a license."
+    static let activate = "Activate"
+    static let proTitle = "License - Activated"
+    static let proMessage = "Thank you for purchasing CmdBar! Enjoy!"
+    static let deactivate = "Deactivate"
+    static let activating = "Activating..."
+}
+
+class AboutViewController: NSViewController, NSTextFieldDelegate {
+    private var appIconImage: NSImageView = {
+        //let image = NSImageView(image: NSApp.applicationIconImage)
+        let image = NSImageView()
+        image.image = NSWorkspace.shared.icon(forFile: Bundle.main.bundlePath)
+        image.imageScaling = .scaleAxesIndependently
+        image.translatesAutoresizingMaskIntoConstraints = false
+        return image
+    }()
+
+    private var appNameLabel: NSTextField = {
+        let textField = NSTextField()
+        textField.stringValue = (Bundle.main.infoDictionary?["CFBundleName"] as? String) ?? "NOT FOUND"
+        textField.isEditable = false
+        textField.isBezeled = false
+        textField.drawsBackground = false
+        textField.alignment = .center
+        textField.font = NSFont.systemFont(ofSize: NSFontDescriptor .preferredFontDescriptor(forTextStyle: .title1).pointSize, weight: .bold)
+        textField.translatesAutoresizingMaskIntoConstraints = false
+        return textField
+    }()
+
+    private var versionLabel: NSTextField = {
+        let textField = NSTextField()
+        textField.stringValue = "Version \((Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String) ?? "-.--")"
+        textField.isEditable = false
+        textField.isBezeled = false
+        textField.drawsBackground = false
+        textField.alignment = .center
+        textField.textColor = NSColor.systemGray
+        textField.font = NSFont.systemFont(ofSize: NSFontDescriptor.preferredFontDescriptor(forTextStyle: .subheadline).pointSize, weight: .regular)
+        textField.translatesAutoresizingMaskIntoConstraints = false
+        return textField
+    }()
+
+    private var copyrightLabel: NSTextField = {
+        let textField = NSTextField()
+        textField.stringValue = Strings.copyright
+        textField.maximumNumberOfLines = 4
+        textField.cell?.truncatesLastVisibleLine = true
+        textField.isEditable = false
+        textField.isBezeled = false
+        textField.drawsBackground = false
+        textField.alignment = .center
+        textField.textColor = NSColor.systemGray
+        textField.font = NSFont.systemFont(ofSize: NSFontDescriptor.preferredFontDescriptor(forTextStyle: .subheadline).pointSize, weight: .regular)
+        textField.translatesAutoresizingMaskIntoConstraints = false
+        return textField
+    }()
+
+    private var authorButton: NSButton = {
+        let button = NSButton()
+        button.title = "Author"
+        button.sizeToFit()
+        button.bezelStyle = .rounded
+        button.action = #selector(author)
+        button.translatesAutoresizingMaskIntoConstraints = false
+        return button
+    }()
+
+    // private var privacyButton: NSButton = {
+    //     let button = NSButton()
+    //     button.title = "Privacy Policy"
+    //     button.sizeToFit()
+    //     button.bezelStyle = .rounded
+    //     button.action = #selector(privacy)
+    //     button.translatesAutoresizingMaskIntoConstraints = false
+    //     return button
+    // }()
+
+    // private var documentationButton: NSButton = {
+    //     let button = NSButton()
+    //     button.title = "Docs"
+    //     button.sizeToFit()
+    //     button.bezelStyle = .rounded
+    //     button.action = #selector(documentation)
+    //     button.translatesAutoresizingMaskIntoConstraints = false
+    //     return button
+    // }()
+    //
+    // private var websiteButton: NSButton = {
+    //     let button = NSButton()
+    //     button.title = "CmdBar.app"
+    //     button.sizeToFit()
+    //     button.bezelStyle = .rounded
+    //     button.action = #selector(website)
+    //     button.translatesAutoresizingMaskIntoConstraints = false
+    //     return button
+    // }()
+
+    private var buttonsContainer: NSLayoutGuide = {
+        let container = NSLayoutGuide()
+        return container
+    }()
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        // Program info
+        view.addSubview(appIconImage)
+        view.addSubview(appNameLabel)
+        view.addSubview(versionLabel)
+        view.addSubview(copyrightLabel)
+
+        // Buttons
+        view.addLayoutGuide(buttonsContainer)
+        // view.addSubview(privacyButton)
+        // view.addSubview(documentationButton)
+        // view.addSubview(websiteButton)
+        view.addSubview(authorButton)
+
+        setupConstraints()
+    }
+
+    override func viewDidAppear() {
+        super.viewDidAppear()
+        self.view.window?.center()
+    }
+
+    override func loadView() {
+        self.view = NSView()
+    }
+
+    private func setupConstraints() {
+        // View.
+        NSLayoutConstraint.activate([
+            view.widthAnchor.constraint(equalToConstant: 300),
+            view.heightAnchor.constraint(lessThanOrEqualToConstant: 500),
+        ])
+
+        // App image.
+        NSLayoutConstraint.activate([
+            appIconImage.widthAnchor.constraint(equalToConstant: 100),
+            appIconImage.heightAnchor.constraint(equalTo: appIconImage.widthAnchor, multiplier: 1),
+            appIconImage.topAnchor.constraint(equalTo: view.topAnchor, constant: ViewConstants.spacing20),
+            appIconImage.centerXAnchor.constraint(equalTo: view.centerXAnchor),
+        ])
+
+        // Title
+        NSLayoutConstraint.activate([
+            appNameLabel.topAnchor.constraint(equalTo: appIconImage.bottomAnchor, constant: ViewConstants.spacing20),
+            appNameLabel.centerXAnchor.constraint(equalTo: view.centerXAnchor),
+
+            versionLabel.topAnchor.constraint(equalTo: appNameLabel.bottomAnchor, constant: ViewConstants.spacing2),
+            versionLabel.centerXAnchor.constraint(equalTo: view.centerXAnchor),
+
+            copyrightLabel.topAnchor.constraint(equalTo: versionLabel.bottomAnchor, constant: ViewConstants.spacing10),
+            copyrightLabel.centerXAnchor.constraint(equalTo: view.centerXAnchor),
+        ])
+
+        // Buttons
+        NSLayoutConstraint.activate([
+            buttonsContainer.topAnchor .constraint(equalTo: copyrightLabel.bottomAnchor, constant: ViewConstants.spacing20),
+            buttonsContainer.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -ViewConstants.spacing20),
+            buttonsContainer.centerXAnchor.constraint(equalTo: view.centerXAnchor),
+
+            authorButton.topAnchor.constraint(equalTo: buttonsContainer.topAnchor),
+            authorButton.bottomAnchor.constraint(equalTo: buttonsContainer.bottomAnchor),
+            authorButton.leadingAnchor.constraint(equalTo: buttonsContainer.leadingAnchor),
+            authorButton.trailingAnchor.constraint(equalTo: buttonsContainer.trailingAnchor),
+
+            // privacyButton.topAnchor.constraint(equalTo: buttonsContainer.topAnchor),
+            // privacyButton.bottomAnchor.constraint(equalTo: buttonsContainer.bottomAnchor),
+            // privacyButton.leadingAnchor.constraint(equalTo: buttonsContainer.leadingAnchor),
+            //
+            // documentationButton.firstBaselineAnchor.constraint(equalTo: privacyButton.firstBaselineAnchor),
+            // documentationButton.leadingAnchor.constraint(equalTo: privacyButton.trailingAnchor,constant: ViewConstants.spacing10),
+            //
+            // websiteButton.firstBaselineAnchor.constraint(equalTo: privacyButton.firstBaselineAnchor),
+            // websiteButton.leadingAnchor.constraint(equalTo: documentationButton.trailingAnchor,constant: ViewConstants.spacing10),
+            // websiteButton.trailingAnchor.constraint(equalTo: buttonsContainer.trailingAnchor),
+        ])
+    }
+
+    @objc private func author() {
+        NSWorkspace.shared.open(URL(string: AboutLinks.author)!)
+    }
+
+    // @objc private func privacy() {
+    //     NSWorkspace.shared.open(URL(string: AboutLinks.privacy)!)
+    // }
+    //
+    // @objc private func documentation() {
+    //     NSWorkspace.shared.open(URL(string: AboutLinks.documentation)!)
+    // }
+    //
+    // @objc private func website() {
+    //     NSWorkspace.shared.open(URL(string: AboutLinks.website)!)
+    // }
+}

src/AppDelegate.swift

@@ -6,9 +6,12 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSWindowDelegate {
     let fileManager = FileManager.default
 
     let window = PopoverPanel(viewController: SearchViewController())
+    let aboutWindow = MenulessWindow(viewController: AboutViewController())
 
     func applicationDidFinishLaunching(_ notification: Notification) {
-        PathManager.shared.rebuildIndex()
+        aboutWindow.level = .statusBar
+
+        PathManager.shared.updateIndex()
 
         window.delegate = self
 
@@ -30,19 +33,15 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSWindowDelegate {
         }
 
         HotKeyManager.shared.enable()
-        if let code =
+        if let code = UserDefaults.standard.object(forKey: "keyCode") as? Int,
-                UserDefaults.standard.object(forKey: "keyCode") as? Int,
+           let mods = UserDefaults.standard.object(forKey: "keyModifiers") as? Int
-           let mods =
-            UserDefaults.standard.object(forKey: "keyModifiers") as? Int
         {
-            HotKeyManager.shared.registerHotKey(key: code,
+            HotKeyManager.shared.registerHotKey(key: code, modifiers: mods)
-                modifiers: mods)
         } else {
             // NOTE: This is the default shortcut. If you want to change
             //       it, do not forget to change it in other files
             //       (SettingsViewController).
-            HotKeyManager.shared.registerHotKey(key: kVK_Space,
+            HotKeyManager.shared.registerHotKey(key: kVK_Space, modifiers: optionKey)
-                modifiers: optionKey)
         }
     }
 
@@ -52,9 +51,7 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSWindowDelegate {
         }
     }
 
-    func applicationShouldHandleReopen(_ sender: NSApplication,
+    func applicationShouldHandleReopen(_ sender: NSApplication, hasVisibleWindows: Bool) -> Bool {
-        hasVisibleWindows: Bool) -> Bool 
-    {
         if !window.isKeyWindow {
             window.makeKeyAndOrderFront(nil)
         }
@@ -79,4 +76,49 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSWindowDelegate {
             return false
         }
     }
+
+    public func showAboutWindow() {
+        NSApplication.shared.activate(ignoringOtherApps: true)
+        aboutWindow.makeKeyAndOrderFront(nil)
+    }
+
+    // NOTE: This function is triggered by DirMonitor.
+    public func fsEventTriggered(_ path: String, _ flags: Int) {
+        var shouldReload = false
+        print("PATH: \(path)")
+        // if containsFlags(key: kFSEventStreamEventFlagNone, in: flags) {
+        // }
+        // if containsFlags(key: kFSEventStreamEventFlagRootChanged, in: flags) {
+        // }
+        // if containsFlags(key: kFSEventStreamEventFlagMustScanSubDirs, in: flags) {
+        // }
+        // if containsFlags(key: kFSEventStreamEventFlagItemInodeMetaMod, in: flags) {
+        // }
+        if containsFlags(key: kFSEventStreamEventFlagItemCreated, in: flags) {
+            print("    CREATED")
+            shouldReload = true
+        }
+        if containsFlags(key: kFSEventStreamEventFlagItemRemoved, in: flags) {
+            print("    REMOVED")
+            shouldReload = true
+        }
+        if containsFlags(key: kFSEventStreamEventFlagItemCloned, in: flags) {
+            print("    CLONED")
+            shouldReload = true
+        }
+        if containsFlags(key: kFSEventStreamEventFlagItemRenamed, in: flags) {
+            print("    RENAMED")
+            shouldReload = true
+        }
+
+        // TODO: This should also trigger SearchViewController's search re-index.
+        if shouldReload {
+            for dir in PathManager.shared.paths {
+                if path.hasPrefix(dir.key) {
+                    PathManager.shared.rebuildIndex(at: dir.key)
+                }
+            }
+            PathManager.shared.refreshFilesystemWatchers()
+        }
+    }
 }

src/DirMonitor.swift

@@ -0,0 +1,94 @@
+import AppKit
+
+class DirMonitor {
+    init(paths: [String], queue: DispatchQueue) {
+        for path in paths {
+            if isDirectory(path) {
+                self.dirs.add(path)
+            }
+        }
+        self.queue = queue
+    }
+
+    deinit {
+        precondition(self.stream == nil, "released a running monitor")
+    }
+
+    private var dirs: NSMutableArray = []
+    private let queue: DispatchQueue
+    // var handler: ((Int, UnsafeMutablePointer<UnsafePointer<Int8>>, UnsafeBufferPointer<UInt32>, UnsafeBufferPointer<UInt64>) -> Void)?
+    private var stream: FSEventStreamRef? = nil
+
+    func start() -> Bool {
+        precondition(self.stream == nil, "started a running monitor")
+        if dirs.count < 1 { return false }
+
+        var context = FSEventStreamContext()
+        context.info = Unmanaged.passUnretained(self).toOpaque()
+
+        // func test(count: Int, paths: UnsafeMutablePointer<UnsafePointer<Int8>>, flags: UnsafeBufferPointer<UInt32>, ids: UnsafeBufferPointer<UInt64>) { }
+        // test(count: numEvents, paths: pathsBase, flags: flagsBuffer, ids: eventIDsBuffer)
+
+        guard let stream = FSEventStreamCreate(nil,
+            {
+            (stream, info, numEvents, eventPaths, eventFlags, eventIds) in
+                let pathsBase         = eventPaths .assumingMemoryBound(to: UnsafePointer<CChar>.self)
+                let pathsBuffer       = UnsafeBufferPointer(start: pathsBase, count: numEvents)
+                let flagsBuffer       = UnsafeBufferPointer(start: eventFlags, count: numEvents)
+                // let eventIDsBuffer = UnsafeBufferPointer(start: eventIds, count: numEvents)
+
+                // stream     -> OpaquePointer
+                // info       -> Optional<UnsafeMutableRawPointer>
+                // numEvents  -> Int
+                // eventPaths -> UnsafeMutableRawPointer
+                // eventFlags -> UnsafePointer<UInt32>
+                // eventIds   -> UnsafePointer<UInt64>
+
+                // pathsBase      -> UnsafeMutablePointer<UnsafePointer<Int8>>
+                // pathsBuffer    -> UnsafeBufferPointer<UnsafePointer<Int8>>
+                // flagsBuffer    -> UnsafeBufferPointer<UInt32>
+                // eventIDsBuffer -> UnsafeBufferPointer<UInt64>
+
+                for i in 0..<numEvents {
+                    let flags = Int(flagsBuffer[i])
+
+                    // NOTE: Since this is a directory monitor, we discard file events.
+                    if !containsFlags(key: kFSEventStreamEventFlagItemIsDir, in: flags) {
+                        continue
+                    }
+
+                    let url: URL = URL(fileURLWithFileSystemRepresentation: pathsBuffer[i], isDirectory: true, relativeTo: nil)
+
+                    // NOTE: The delegate callback should always be called on main thread!
+                    DispatchQueue.main.async {
+                        delegate.fsEventTriggered(url.path, flags)
+                    }
+                }
+            },
+            &context,
+            self.dirs, // [path as NSString] as NSArray,
+            UInt64(kFSEventStreamEventIdSinceNow),
+            1.0,
+            FSEventStreamCreateFlags(kFSEventStreamCreateFlagFileEvents) // FSEventStreamCreateFlags(kFSEventStreamCreateFlagNone)
+        ) else {
+            return false
+        }
+
+        self.stream = stream
+
+        FSEventStreamSetDispatchQueue(stream, queue)
+        guard FSEventStreamStart(stream) else {
+            FSEventStreamInvalidate(stream)
+            self.stream = nil
+            return false
+        }
+        return true
+    }
+
+    func stop() {
+        guard let stream = self.stream else { return }
+        FSEventStreamStop(stream)
+        FSEventStreamInvalidate(stream)
+        self.stream = nil
+    }
+}

src/EditableNSTextField.swift

@@ -15,32 +15,31 @@ final class EditableNSTextField: NSTextField {
         if event.type == NSEvent.EventType.keyDown {
             if modsContains(keys: OSCmd, in: modifiers) {
                 if key == kVK_ANSI_X {
-                    if NSApp.sendAction(#selector(NSText.cut(_:)),
+                    if NSApp.sendAction(#selector(NSText.cut(_:)), to: nil, from: self) {
-                                        to: nil, from: self)
+                        return true
-                    { return true }
+                    }
                 } else if key == kVK_ANSI_C {
-                    if NSApp.sendAction(#selector(NSText.copy(_:)),
+                    if NSApp.sendAction(#selector(NSText.copy(_:)), to: nil, from: self) {
-                                        to: nil, from: self)
+                        return true
-                    { return true }
+                    }
                 } else if key == kVK_ANSI_V {
-                    if NSApp.sendAction(#selector(NSText.paste(_:)),
+                    if NSApp.sendAction(#selector(NSText.paste(_:)), to: nil, from: self) {
-                                        to: nil, from: self)
+                        return true
-                    { return true }
+                    }
                 } else if key == kVK_ANSI_Z {
-                    if NSApp.sendAction(Selector(("undo:")),
+                    if NSApp.sendAction(Selector(("undo:")), to: nil, from: self) {
-                                        to: nil, from: self)
+                        return true
-                    { return true }
+                    }
                 } else if key == kVK_ANSI_A {
-                    if NSApp.sendAction(
+                    if NSApp.sendAction(#selector(NSResponder.selectAll(_:)), to: nil, from: self) {
-                        #selector(NSResponder.selectAll(_:)), to: nil,
+                        return true
-                                  from: self)
+                    }
-                    { return true }
                 }
             } else if modsContains(keys: OSCmd | OSShift, in: modifiers) {
                 if key == kVK_ANSI_Z {
-                    if NSApp.sendAction(Selector(("redo:")), to: nil,
+                    if NSApp.sendAction(Selector(("redo:")), to: nil, from: self) {
-                                        from: self)
+                        return true
-                    { return true }
+                    }
                 }
             }
         }

src/EventMonitor.swift

@@ -35,8 +35,7 @@ final class LocalEventMonitor: EventMonitor {
     }
 
     override func start() {
-        monitor = NSEvent.addLocalMonitorForEvents(matching: mask,
+        monitor = NSEvent.addLocalMonitorForEvents(matching: mask, handler: handler)
-                                                   handler: handler)
     }
 }
 
@@ -51,7 +50,6 @@ final class GlobalEventMonitor: EventMonitor {
     }
 
     override func start() {
-        monitor = NSEvent.addGlobalMonitorForEvents(matching: mask,
+        monitor = NSEvent.addGlobalMonitorForEvents(matching: mask, handler: handler)
-                                                    handler: handler)
     }
 }

src/Helpers.swift

@@ -15,9 +15,13 @@ func modsContainsNone(in modifiers: UInt) -> Bool {
     return (modifiers & OSMods) == 0
 }
 
+func containsFlags(key: Int, in flags: Int) -> Bool {
+    return (flags & key) == key
+}
+
 enum ViewConstants {
-    static let spacing2: CGFloat = 2
+    static let spacing2:  CGFloat =  2
-    static let spacing5: CGFloat = 2
+    static let spacing5:  CGFloat =  2
     static let spacing10: CGFloat = 10
     static let spacing15: CGFloat = 15
     static let spacing20: CGFloat = 20
@@ -38,10 +42,8 @@ func keyName(virtualKeyCode: UInt16) -> String? {
 
     //let source =
     //    TISCopyCurrentKeyboardLayoutInputSource().takeRetainedValue()
-    let source = TISCopyInputSourceForLanguage("en-US" as CFString)
+    let source = TISCopyInputSourceForLanguage("en-US" as CFString).takeRetainedValue();
-        .takeRetainedValue();
+    guard let ptr = TISGetInputSourceProperty(source, kTISPropertyUnicodeKeyLayoutData)
-    guard let ptr = TISGetInputSourceProperty(source,
-        kTISPropertyUnicodeKeyLayoutData)
     else {
         print("Could not get keyboard layout data")
         return nil
@@ -49,11 +51,9 @@ func keyName(virtualKeyCode: UInt16) -> String? {
     let layoutData = Unmanaged<CFData>.fromOpaque(ptr)
         .takeUnretainedValue() as Data
     let osStatus = layoutData.withUnsafeBytes {
-        UCKeyTranslate(
+        UCKeyTranslate($0.bindMemory(to: UCKeyboardLayout.self).baseAddress, virtualKeyCode,
-            $0.bindMemory(to: UCKeyboardLayout.self).baseAddress,
+                       UInt16(kUCKeyActionDown), modifierKeys, keyboardType, UInt32(kUCKeyTranslateNoDeadKeysMask),
-            virtualKeyCode, UInt16(kUCKeyActionDown), modifierKeys,
+                       &deadKeys, maxNameLength, &nameLength, &nameBuffer)
-            keyboardType, UInt32(kUCKeyTranslateNoDeadKeysMask),
-            &deadKeys, maxNameLength, &nameLength, &nameBuffer)
     }
     guard osStatus == noErr else {
         print("Code: \(virtualKeyCode) Status: \(osStatus)")
@@ -72,15 +72,18 @@ func keyName(virtualKeyCode: UInt16) -> String? {
     return character
 }
 
-func systemImage(_ name: String, _ size: NSFont.TextStyle,
+func isDirectory(_ path: String) -> Bool {
-    _ scale: NSImage.SymbolScale,
+    var isDirectory: ObjCBool = false
-    _ configuration: NSImage.SymbolConfiguration) -> NSImage?
+    if FileManager.default.fileExists(atPath: path, isDirectory: &isDirectory), isDirectory.boolValue {
-{
+        return true
+    } else {
+        return false
+    }
+}
+
+func systemImage(_ name: String, _ size: NSFont.TextStyle, _ scale: NSImage.SymbolScale, _ configuration: NSImage.SymbolConfiguration) -> NSImage? {
     return NSImage(systemSymbolName: name, accessibilityDescription: nil)?
-        .withSymbolConfiguration(
+        .withSymbolConfiguration(NSImage.SymbolConfiguration(textStyle: size, scale: scale).applying(configuration))
-            NSImage.SymbolConfiguration(textStyle: size, scale: scale)
-                .applying(configuration)
-        )
 }
 
 func isDirectory(atPath path: String) -> Bool {
@@ -92,16 +95,16 @@ func isDirectory(atPath path: String) -> Bool {
 }
 
 extension String {
-    /// This converts string to UInt as a fourCharCode
+    // This converts string to UInt as a fourCharCode
     public var fourCharCodeValue: Int {
         var result: Int = 0
         if let data = self.data(using: String.Encoding.macOSRoman) {
-            data.withUnsafeBytes({ (rawBytes) in
+            data.withUnsafeBytes { (rawBytes) in
                 let bytes = rawBytes.bindMemory(to: UInt8.self)
                 for i in 0 ..< data.count {
                     result = result << 8 + Int(bytes[i])
                 }
-            })
+            }
         }
         return result
     }

src/HotKeyManager.swift

@@ -2,26 +2,16 @@ import Carbon
 import OSLog
 
 final class HotKeyManager {
-    fileprivate static let logger = Logger(
-        subsystem: Bundle.main.bundleIdentifier!,
-        //category: String(describing: HotKeyManager.self)
-        category: String(describing: AppDelegate.self)
-    )
-
     static let shared = HotKeyManager()
 
-    private var eventType = EventTypeSpec(
+    private var eventType = EventTypeSpec(eventClass: OSType(kEventClassKeyboard), eventKind: UInt32(kEventHotKeyPressed))
-        eventClass: OSType(kEventClassKeyboard),
-        eventKind: UInt32(kEventHotKeyPressed))
     private var eventHandlerRef: EventHandlerRef?
     public var handler: EventHandlerUPP?
 
     private var hotKeyRef: EventHotKeyRef?
-    private let hotKeyID: EventHotKeyID = EventHotKeyID(
+    private let hotKeyID: EventHotKeyID = EventHotKeyID(signature: OSType("grap".fourCharCodeValue), id: 1)
-        signature: OSType("grap".fourCharCodeValue), id: 1)
 
     private init() {}
-
     deinit {}
 
     // TODO: Handle errors.
@@ -30,13 +20,11 @@ final class HotKeyManager {
             disable()
         }
 
-        let err = InstallEventHandler(
+        let err = InstallEventHandler(GetApplicationEventTarget(), handler, 1, &eventType, nil, &eventHandlerRef)
-            GetApplicationEventTarget(), handler, 1, &eventType,
-            nil, &eventHandlerRef)
         if err == noErr {
-            Self.logger.debug("Installed event handler.")
+            print("Installed event handler.")
         } else {
-            Self.logger.error("Failed to install event handler.")
+            print("Failed to install event handler.")
         }
     }
 
@@ -44,30 +32,25 @@ final class HotKeyManager {
         guard eventHandlerRef != nil else { return }
         let err = RemoveEventHandler(eventHandlerRef)
         if err == noErr {
-            eventHandlerRef = nil // WARNING: Does it remove no matter
+            eventHandlerRef = nil // WARNING: Does it remove no matter what on error?
-                                  //          what on error?
+            print("Removed event handler.")
-            Self.logger.debug("Removed event handler.")
         } else {
-            Self.logger.error("Failed to remove event handler.")
+            print("Failed to remove event handler.")
         }
     }
 
     // TODO: Handle errors.
     // NOTE: Multiple modifiers should be ORed.
     public func registerHotKey(key: Int, modifiers: Int) {
-        // GetEventDispatcherTarget
         if hotKeyRef != nil {
             unregisterHotKey()
         }
 
-        let err = RegisterEventHotKey(
+        let err = RegisterEventHotKey(UInt32(key), UInt32(modifiers), hotKeyID, GetApplicationEventTarget(), UInt32(kEventHotKeyNoOptions), &hotKeyRef)
-            UInt32(key), UInt32(modifiers), hotKeyID,
-            GetApplicationEventTarget(), UInt32(kEventHotKeyNoOptions),
-            &hotKeyRef)
         if err == noErr {
-            Self.logger.debug("Registered hot key.")
+            print("Registered hot key.")
         } else {
-            Self.logger.error("Failed to register hot key.")
+            print("Failed to register hot key.")
         }
     }
 
@@ -76,11 +59,10 @@ final class HotKeyManager {
         guard hotKeyRef != nil else { return }
         let err = UnregisterEventHotKey(hotKeyRef)
         if err == noErr {
-            hotKeyRef = nil // WARNING: Does it unregister no matter
+            hotKeyRef = nil // WARNING: Does it unregister no matter what on error?
-                            //          what on error?
+            print("Successfully unregistered hot key.")
-            Self.logger.debug("Successfully unregestered hot key.")
         } else {
-            Self.logger.error("Failed to unregester hot key.")
+            print("Failed to unregistered hot key.")
         }
     }
 }

src/KeyDetectorButton.swift

@@ -13,8 +13,7 @@ final class KeyDetectorButton: NSButton {
 
     override var acceptsFirstResponder: Bool { true }
 
-    // This removes default bahavior from NSButton, thus allowing mouse up
+    // This removes default bahavior from NSButton, thus allowing mouse up events.
-    // events.
     override func mouseDown(with event: NSEvent) {}
 
     override func mouseUp(with event: NSEvent) {
@@ -23,16 +22,13 @@ final class KeyDetectorButton: NSButton {
 
     override func keyDown(with event: NSEvent) {
         if event.keyCode == kVK_Escape || event.keyCode == kVK_Return {
+            // Ignore escape and return keys.
         } else if event.keyCode == kVK_Delete {
-            if let key = defaultKey,
+            if let key = defaultKey, let character = keyName(virtualKeyCode: UInt16(key)) {
-               let character = keyName(virtualKeyCode: UInt16(key))
-            {
                 title = character
             }
         } else {
-            if let character =
+            if let character = keyName(virtualKeyCode: UInt16(event.keyCode)) {
-                keyName(virtualKeyCode: UInt16(event.keyCode))
-            {
                 title = character
             }
             delegate?.keyWasSet(to: Int(event.keyCode))

src/Makefile

@@ -7,12 +7,10 @@ XCODE_PATH = $(shell xcode-select --print-path)
 
 EXEC = Grapp
 
-SRCMODULES = Helpers.swift EditableNSTextField.swift EventMonitor.swift \
+SRCMODULES = Helpers.swift EditableNSTextField.swift EventMonitor.swift PopoverPanel.swift SearchViewController.swift \
-	PopoverPanel.swift SearchViewController.swift \
+	SettingsViewController.swift HotKeyManager.swift KeyDetectorButton.swift PathManager.swift PathsTableCellView.swift \
-	SettingsViewController.swift HotKeyManager.swift \
+	ProgramsTable.swift ShadowView.swift DirMonitor.swift MenulessWindow.swift AboutViewController.swift AppDelegate.swift \
-	KeyDetectorButton.swift PathManager.swift PathsTableCellView.swift \
+	main.swift
-	ProgramsTable.swift ShadowView.swift \
-	AppDelegate.swift main.swift
 ARMOBJMODULES = $(addprefix ./arm64/,$(SRCMODULES:.swift=.o))
 X86OBJMODULES = $(addprefix ./x86_64/,$(SRCMODULES:.swift=.o))
 
@@ -20,50 +18,35 @@ LIBS =
 
 FRAMEWORKS = -framework AppKit -framework ServiceManagement
 
-# HACK: Target is getting touched because timestamps of the generated
+# HACK: Target is getting touched because timestamps of the generated object file don't change unless there's an actual change in the
-#       object file don't change unless there's an actual change in the
+#       outputted object code. This results in this target running every single time. I'm not sure whether that's the exact reason, but
-#       outputted object code. This results in this target running every
+#       I can't imagine why timestamps wouldn't change. When clang generates same exact executable, timestamps do change.
-#       single time. I'm not sure whether that's the exact reason, but
-#       I can't imagine why timestamps wouldn't change. When clang
-#       generates same exact executable, timestamps do change.
 ./arm64/%.o: %.swift
-	swift -frontend -c -target arm64-apple-macos$(MACOS_VERSION) $(FLAGS) \
+	swift -frontend -c -target arm64-apple-macos$(MACOS_VERSION) $(FLAGS) -primary-file $< $(filter-out $<, $(SRCMODULES)) $(LIBS) \
-		-primary-file $< $(filter-out $<, $(SRCMODULES)) $(LIBS) \
+		$(FRAMEWORKS) -sdk $(SDK) -module-name $(EXEC) -o $@ -emit-module && \
-		$(FRAMEWORKS) -sdk $(SDK) -module-name $(EXEC) -o $@ \
+	touch $@
-		-emit-module && touch $@
 
 ifdef UNIVERSAL
 ./x86_64/%.o: %.swift
-	@swift -frontend -c -target x86_64-apple-macos$(MACOS_VERSION) \
+	@swift -frontend -c -target x86_64-apple-macos$(MACOS_VERSION) $(FLAGS) -primary-file $< $(filter-out $<, $(SRCMODULES)) \
-		$(FLAGS) -primary-file $< $(filter-out $<, $(SRCMODULES)) \
+		$(LIBS) $(FRAMEWORKS) -sdk $(SDK) -module-name $(EXEC) -o $@ -emit-module && \
-		$(LIBS) $(FRAMEWORKS) -sdk $(SDK) -module-name $(EXEC) -o $@ \
+	touch $@
-		-emit-module && touch $@
 endif
 
 ./arm64/$(EXEC): $(ARMOBJMODULES)
-	@ld -syslibroot $(SDK) -lSystem $(FRAMEWORKS) -arch arm64 \
+	@ld -syslibroot $(SDK) -lSystem $(FRAMEWORKS) -arch arm64 -macos_version_min $(MACOS_VERSION).0 \
-		-macos_version_min $(MACOS_VERSION).0 \
 		/Library/Developer/CommandLineTools/usr/lib/swift/macosx/libswiftCompatibilityPacks.a \
-		-sectcreate __TEXT __info_plist Info.plist \
+		-sectcreate __TEXT __info_plist Info.plist -L /Library/Developer/CommandLineTools/usr/lib/swift/macosx -L \
-		-L /Library/Developer/CommandLineTools/usr/lib/swift/macosx -L \
+		/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib/swift -no_objc_category_merging -L $(XCODE_PATH) -rpath \
-		/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib/swift \
+		Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/macosx ./arm64/main.o $(filter-out ./arm64/main.o, $(ARMOBJMODULES)) -o $@
-		-no_objc_category_merging -L $(XCODE_PATH) -rpath \
-		Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/macosx \
-		./arm64/main.o $(filter-out ./arm64/main.o, $(ARMOBJMODULES)) \
-		-o $@
 
 ifdef UNIVERSAL
 ./x86_64/$(EXEC): $(X86OBJMODULES)
-	@ld -syslibroot $(SDK) -lSystem $(FRAMEWORKS) -arch x86_64 \
+	@ld -syslibroot $(SDK) -lSystem $(FRAMEWORKS) -arch x86_64 -macos_version_min $(MACOS_VERSION).0 \
-		-macos_version_min $(MACOS_VERSION).0 \
 		/Library/Developer/CommandLineTools/usr/lib/swift/macosx/libswiftCompatibilityPacks.a \
-		-sectcreate __TEXT __info_plist Info.plist \
+		-sectcreate __TEXT __info_plist Info.plist -L /Library/Developer/CommandLineTools/usr/lib/swift/macosx -L \
-		-L /Library/Developer/CommandLineTools/usr/lib/swift/macosx -L \
+		/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib/swift -no_objc_category_merging -L $(XCODE_PATH) -rpath \
-		/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib/swift \
+		Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/macosx ./x86_64/main.o $(filter-out ./x86_64/main.o, $(X86OBJMODULES)) -o $@
-		-no_objc_category_merging -L $(XCODE_PATH) -rpath \
-		Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/macosx \
-		./x86_64/main.o $(filter-out ./x86_64/main.o, $(X86OBJMODULES)) \
-		-o $@
 endif
 
 ifdef UNIVERSAL
@@ -74,7 +57,6 @@ $(EXEC): ./arm64/$(EXEC)
 	@lipo -create -output $(EXEC) $^
 endif
 
-
 $(EXEC).app: $(EXEC)
 	@rm -rf $@
 	@mkdir -p $@/Contents/MacOS/ && \
@@ -82,16 +64,20 @@ $(EXEC).app: $(EXEC)
 	cp Info.plist $@/Contents/ && \
 	cp resources/AppIcon.icns $@/Contents/Resources/ && \
 	cp $(EXEC) $@/Contents/MacOS/ && \
-	$(if $(DEBUG), \
+	$(if $(DEBUG), codesign --entitlements Grapp.entitlements -s ${APPLE_DEVELOPMENT} -f --timestamp -o runtime $(EXEC).app, \
-		codesign --entitlements Grapp.entitlements \
+		codesign -s ${APPLE_DEVELOPER_ID_APPLICATION} -f --timestamp -o runtime $(EXEC).app)
-		-s ${APPLE_DEVELOPMENT} -f --timestamp -o runtime $(EXEC).app, \
-		codesign -s ${APPLE_DEVELOPER_ID_APPLICATION} -f --timestamp \
-		-o runtime $(EXEC).app)
 
 all: $(EXEC).app
 
-run: all
+clear:
-	@open $(EXEC).app
+	clear
+
+kill:
+	-pkill $(EXEC)
+
+run: clear kill all
+# 	@open $(EXEC).app
+	./$(EXEC)
 
 clean:
 	rm -rf $(EXEC) $(EXEC).app arm64 x86_64

src/MenulessWindow.swift

@@ -0,0 +1,33 @@
+import AppKit
+import Carbon
+
+class MenulessWindow: NSWindow {
+    init(viewController: NSViewController) {
+        super.init(
+            contentRect: CGRect(x: 0, y: 0, width: 100, height: 100),
+            styleMask: [.titled, .closable],
+            backing: .buffered,
+            defer: false
+        )
+        super.contentViewController = viewController
+
+        title = ""
+        titlebarAppearsTransparent = true
+        collectionBehavior = [.managed, .fullScreenNone]
+        isReleasedWhenClosed = false
+        hidesOnDeactivate = false
+    }
+
+    override func performKeyEquivalent(with event: NSEvent) -> Bool {
+        let modifiers = event.modifierFlags.rawValue
+        let key = event.keyCode
+
+        if event.type == NSEvent.EventType.keyDown {
+            if modsContains(keys: OSCmd, in: modifiers) && key == kVK_ANSI_W {
+                performClose(nil)
+            }
+        }
+
+        return super.performKeyEquivalent(with: event)
+    }
+}

src/PathManager.swift

@@ -3,86 +3,133 @@ import AppKit
 struct Program {
     let path: String
     let name: String
-    let ext: String
+    let ext : String
-    var img: NSImage?
+    var img : NSImage?
 }
 
 final class PathManager {
     static let shared = PathManager()
 
-    // TODO: Filesystem events to watch changes on these directories and
+    private var dirMonitor: DirMonitor?
-    //       rebuild index when needed.
+
     // NOTE: These are default paths where MacOS's default programs are
     //       stored. This list should be updated if something changes in
     //       newer MacOS version.
-    static let defaultPaths = ["/Applications", "/System/Applications",
+    static let defaultPaths = [
-        "/System/Applications/Utilities", "/System/Library/CoreServices",
+        "/Applications",
+        "/System/Applications",
+        "/System/Applications/Utilities",
+        "/System/Library/CoreServices",
         "/Applications/Xcode.app/Contents/Applications",
-        "/System/Library/CoreServices/Applications"]
+        "/System/Library/CoreServices/Applications"
-    var userPaths: [String] = []
+    ]
-    private(set) var programs: [Program] = []
+    private(set) var paths: [String: [Program]] = [:]
 
     private let fileManager = FileManager.default
 
     private init() {
-        if let paths =
+        // UserDefaults.standard.removeObject(forKey: "programPaths")
-            UserDefaults.standard.stringArray(forKey: "programPaths")
+        if let dirs = UserDefaults.standard.stringArray(forKey: "programPaths"), !dirs.isEmpty {
-        {
+            for dir in dirs {
-            for path in paths {
+                addPath(dir)
-                addPath(path)
             }
         } else {
-            userPaths += Self.defaultPaths
+            for path in PathManager.defaultPaths {
+                addPath(path)
+            }
         }
     }
 
     deinit {}
 
     public func addPath(_ path: String) {
-        if !userPaths.contains(path) {
+        if isDirectory(path) {
-            userPaths.append(path)
+            paths[path] = []
         }
     }
 
     public func removePath(_ path: String) {
-        userPaths.removeAll { $0 == path }
+        paths.removeValue(forKey: path)
     }
 
-    public func removeEmpty() {
+    public func resetPaths() {
-        userPaths.removeAll { $0.isEmpty }
+        paths = [:]
+        for path in PathManager.defaultPaths {
+            addPath(path)
+        }
+    }
+
+    public func contains(_ name: String) -> Bool {
+        for path in paths {
+            for prog in path.value {
+                if prog.name == name {
+                    return true
+                }
+            }
+        }
+        return false
+    }
+
+    public func refreshFilesystemWatchers() {
+        dirMonitor?.stop()
+        dirMonitor = nil
+
+        var buf: [String] = []
+        for path in paths {
+            buf.append(path.key)
+        }
+
+        dirMonitor = DirMonitor(paths: buf, queue: DispatchQueue.global(qos: .userInitiated))
+        // _ = dirMonitor!.start()
+        if dirMonitor!.start() {
+            print("Started monitoring directories.")
+        } else {
+            print("Failed to start monitoring directories.")
+        }
     }
 
     public func savePaths() {
-        UserDefaults.standard.set(userPaths, forKey: "programPaths")
+        var buf: [String] = []
-    }
+        for path in paths {
-
+            buf.append(path.key)
-    public func reset() {
-        userPaths = []
-        userPaths += Self.defaultPaths
-        savePaths()
-    }
-
-    public func rebuildIndex() {
-        programs.removeAll(keepingCapacity: true)
-        for path in userPaths {
-            do {
-                let items = try fileManager.contentsOfDirectory(
-                    atPath: path)
-                for item in items {
-                    let name = String(item.dropLast(4))
-
-                    if item.hasSuffix(".app") {
-                        if !programs.contains(where: { name == $0.name }) {
-                            programs.append(
-                                Program(
-                                    path: path, name: name, ext: ".app",
-                                    img: nil))
-                        }
-                    }
-                }
-            } catch {
-                print("Error reading directory: \(error.localizedDescription)")
-            }
         }
+        UserDefaults.standard.set(buf, forKey: "programPaths")
+    }
+
+    // PERF: Optimize some more. Do not rebuild the entire array, instead
+    //       remove or add only needed programs. Thereby, limiting the
+    //       amount of allocations.
+    public func rebuildIndex(at path: String) {
+        paths[path] = indexDirs(at: path, deepness: 2)
+    }
+
+    public func indexDirs(at path: String, deepness: Int) -> [Program] {
+        var array: [Program] = []
+
+        do {
+            var items = try fileManager.contentsOfDirectory(atPath: path)
+            items = items.filter({ isDirectory((path + "/" + $0)) })
+
+            for item in items {
+                let name = String(item.dropLast(4))
+
+                if item.hasSuffix(".app"), !contains(name) {
+                    array.append(Program(path: path, name: name, ext: ".app", img: nil))
+                }
+                if deepness > 0 {
+                    array += indexDirs(at: path + "/" + item, deepness: deepness-1)
+                }
+            }
+        } catch { print("Error: \(error.localizedDescription)") }
+
+        return array
+    }
+
+    public func updateIndex() {
+        print("updateIndex()")
+        for path in paths {
+            rebuildIndex(at: path.key)
+        }
+        refreshFilesystemWatchers()
     }
 }

src/PopoverPanel.swift

@@ -52,7 +52,7 @@ class PopoverPanel: NSPanel {
                 in: modifiers) &&
                 key == kVK_ANSI_R
             {
-                PathManager.shared.rebuildIndex()
+                PathManager.shared.updateIndex()
                 return true
             } else if key == kVK_Escape {
                 resignKey()

src/ProgramsTable.swift

@@ -7,8 +7,7 @@ final class ProgramsTableView: NSTableView {
 class ProgramsTableRowView: NSTableRowView {
     override func drawSelection(in dirtyRect: NSRect) {
         if self.selectionHighlightStyle != .none {
-            let selectionColor = NSColor.controlAccentColor
+            let selectionColor = NSColor.controlAccentColor.withAlphaComponent(0.8)
-                .withAlphaComponent(0.8)
             selectionColor.setFill()
             self.bounds.fill()
         }
@@ -22,8 +21,7 @@ class ProgramsTableViewCell: NSTableCellView {
 
     public var appIconImage: NSImageView = {
         let image = NSImageView()
-        image.image = 
+        image.image = NSWorkspace.shared.icon(forFile: Bundle.main.bundlePath)
-            NSWorkspace.shared.icon(forFile: Bundle.main.bundlePath)
         image.imageScaling = .scaleAxesIndependently
         image.translatesAutoresizingMaskIntoConstraints = false
         return image
@@ -40,9 +38,7 @@ class ProgramsTableViewCell: NSTableCellView {
     public var progPathLabel: NSTextField = {
         let textField = NSTextField(labelWithString: "")
         textField.cell?.lineBreakMode = .byTruncatingTail
-        textField.font = NSFont.systemFont(
+        textField.font = NSFont.systemFont(ofSize: NSFontDescriptor.preferredFontDescriptor(forTextStyle: .caption1).pointSize, weight: .medium)
-            ofSize: NSFontDescriptor.preferredFontDescriptor(
-                forTextStyle: .caption1).pointSize, weight: .medium)
         textField.translatesAutoresizingMaskIntoConstraints = false
         return textField
     }()
@@ -59,23 +55,15 @@ class ProgramsTableViewCell: NSTableCellView {
             appIconImage.heightAnchor.constraint(equalToConstant: 40),
             appIconImage.topAnchor.constraint(equalTo: topAnchor),
             appIconImage.bottomAnchor.constraint(equalTo: bottomAnchor),
-            appIconImage.leadingAnchor.constraint(equalTo: leadingAnchor,
+            appIconImage.leadingAnchor.constraint(equalTo: leadingAnchor, constant: ViewConstants.spacing5),
-                constant: ViewConstants.spacing5),
 
-            titleField.topAnchor.constraint(
+            titleField.topAnchor.constraint(equalTo: appIconImage.topAnchor, constant: ViewConstants.spacing2),
-                equalTo: appIconImage.topAnchor,
+            titleField.leadingAnchor.constraint(equalTo: appIconImage.trailingAnchor, constant: ViewConstants.spacing5),
-                constant: ViewConstants.spacing2),
-            titleField.leadingAnchor.constraint(
-                equalTo: appIconImage.trailingAnchor,
-                constant: ViewConstants.spacing5),
             titleField.trailingAnchor.constraint(equalTo: trailingAnchor),
 
-            progPathLabel.topAnchor.constraint(
+            progPathLabel.topAnchor.constraint(equalTo: titleField.bottomAnchor),
-                equalTo: titleField.bottomAnchor),
+            progPathLabel.leadingAnchor.constraint(equalTo: titleField.leadingAnchor),
-            progPathLabel.leadingAnchor.constraint(
+            progPathLabel.trailingAnchor.constraint(equalTo: titleField.trailingAnchor),
-                equalTo: titleField.leadingAnchor),
-            progPathLabel.trailingAnchor.constraint(
-                equalTo: titleField.trailingAnchor),
         ])
     }
 

src/SearchViewController.swift

@@ -6,12 +6,16 @@ import Carbon
 //       elements inside of it.
 fileprivate let windowCornerRadius = 15.0
 
+struct ProgramWeighted {
+    let program: Program
+    let weight: Int
+}
+
 class SearchViewController: NSViewController, NSTextFieldDelegate,
     NSPopoverDelegate, NSTableViewDataSource, NSTableViewDelegate
 {
     private var keyboardEvents: EventMonitor?
 
-    private var foundProgram: Program? = nil
     private var programsList: [Program] = []
 
     private var programsTableViewSelection = 0
@@ -38,8 +42,7 @@ class SearchViewController: NSViewController, NSTextFieldDelegate,
         effect.wantsLayer = true
         effect.layer?.masksToBounds = true
 
-        effect.layer?.borderColor = NSColor.labelColor
+        effect.layer?.borderColor = NSColor.labelColor.withAlphaComponent(0.1).cgColor
-                                        .withAlphaComponent(0.1).cgColor
         effect.layer?.borderWidth = 1
         effect.layer?.cornerRadius = windowCornerRadius
 
@@ -68,17 +71,14 @@ class SearchViewController: NSViewController, NSTextFieldDelegate,
         textField.focusRingType = .none
         textField.placeholderString = "Program Search"
         textField.bezelStyle = .roundedBezel
-        textField.font = NSFont.systemFont(
+        textField.font = NSFont.systemFont(ofSize: NSFontDescriptor.preferredFontDescriptor(forTextStyle: .largeTitle).pointSize, weight: .medium)
-            ofSize: NSFontDescriptor.preferredFontDescriptor(
-                forTextStyle: .largeTitle).pointSize, weight: .medium)
         textField.translatesAutoresizingMaskIntoConstraints = false
         return textField
     }()
 
     private var settingsButton: NSButton = {
         let button = NSButton()
-        button.image = systemImage("gear.circle.fill", .title1, .large,
+        button.image = systemImage("gear.circle.fill", .title1, .large, .init(paletteColors: [.labelColor, .systemGray]))
-            .init(paletteColors: [.labelColor, .systemGray]))
         button.isBordered = false
         button.action = #selector(openSettings)
         button.sizeToFit()
@@ -90,10 +90,7 @@ class SearchViewController: NSViewController, NSTextFieldDelegate,
     private var tableScrollView: NSScrollView = {
         let scroll = NSScrollView()
         scroll.automaticallyAdjustsContentInsets = false
-        scroll.contentInsets = NSEdgeInsets(
+        scroll.contentInsets = NSEdgeInsets(top: 0, left: 0, bottom: ViewConstants.spacing10, right: 0)
-                                   top: 0, left: 0,
-                                   bottom: ViewConstants.spacing10,
-                                   right: 0)
         scroll.drawsBackground = false
         scroll.translatesAutoresizingMaskIntoConstraints = false
         return scroll
@@ -133,64 +130,37 @@ class SearchViewController: NSViewController, NSTextFieldDelegate,
     var tableViewHeightAnchor: NSLayoutConstraint?
 
     private func setConstraints() {
-        tableViewHeightAnchor = tableScrollView.heightAnchor
+        tableViewHeightAnchor = tableScrollView.heightAnchor.constraint(equalToConstant: 0)
-                                           .constraint(equalToConstant: 0)
         tableViewHeightAnchor?.isActive = true
 
         NSLayoutConstraint.activate([
-            view.topAnchor.constraint(equalTo: contentView.topAnchor,
+            view.topAnchor.constraint(equalTo: contentView.topAnchor, constant: -100),
-                                      constant: -100),
+            view.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: 100),
-            view.bottomAnchor.constraint(equalTo: contentView.bottomAnchor,
+            view.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: -100),
-                                         constant: 100),
+            view.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: 100),
-            view.leadingAnchor.constraint(
-                equalTo: contentView.leadingAnchor, constant: -100),
-            view.trailingAnchor.constraint(
-                equalTo: contentView.trailingAnchor, constant: 100),
 
-            shadowView.topAnchor.constraint(
+            shadowView.topAnchor.constraint(equalTo: backgroundView.topAnchor),
-                equalTo: backgroundView.topAnchor),
+            shadowView.bottomAnchor.constraint(equalTo: backgroundView.bottomAnchor),
-            shadowView.bottomAnchor.constraint(
+            shadowView.leadingAnchor.constraint(equalTo: backgroundView.leadingAnchor),
-                equalTo: backgroundView.bottomAnchor),
+            shadowView.trailingAnchor.constraint(equalTo: backgroundView.trailingAnchor),
-            shadowView.leadingAnchor.constraint(
-                equalTo: backgroundView.leadingAnchor),
-            shadowView.trailingAnchor.constraint(
-                equalTo: backgroundView.trailingAnchor),
 
-            backgroundView.topAnchor.constraint(
+            backgroundView.topAnchor.constraint(equalTo: contentView.topAnchor),
-                equalTo: contentView.topAnchor),
+            backgroundView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
-            backgroundView.bottomAnchor.constraint(
+            backgroundView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
-                equalTo: contentView.bottomAnchor),
+            backgroundView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
-            backgroundView.leadingAnchor.constraint(
-                equalTo: contentView.leadingAnchor),
-            backgroundView.trailingAnchor.constraint(
-                equalTo: contentView.trailingAnchor),
 
             searchInput.widthAnchor.constraint(equalToConstant: 350),
-            searchInput.topAnchor.constraint(
+            searchInput.topAnchor.constraint(equalTo: contentView.topAnchor, constant: ViewConstants.spacing10),
-                equalTo: contentView.topAnchor,
+            searchInput.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: ViewConstants.spacing15),
-                constant: ViewConstants.spacing10),
-            searchInput.leadingAnchor.constraint(
-                equalTo: contentView.leadingAnchor,
-                constant: ViewConstants.spacing15),
 
-            settingsButton.centerYAnchor.constraint(
+            settingsButton.centerYAnchor.constraint(equalTo: searchInput.centerYAnchor),
-                equalTo: searchInput.centerYAnchor),
+            settingsButton.leadingAnchor.constraint(equalTo: searchInput.trailingAnchor, constant: ViewConstants.spacing5),
-            settingsButton.leadingAnchor.constraint(
+            settingsButton.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -ViewConstants.spacing10),
-                equalTo: searchInput.trailingAnchor,
-                constant: ViewConstants.spacing5),
-            settingsButton.trailingAnchor.constraint(
-                equalTo: contentView.trailingAnchor,
-                constant: -ViewConstants.spacing10),
 
-            tableScrollView.topAnchor.constraint(
+            tableScrollView.topAnchor.constraint(equalTo: searchInput.bottomAnchor, constant: ViewConstants.spacing10),
-                equalTo: searchInput.bottomAnchor,
+            tableScrollView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
-                constant: ViewConstants.spacing10),
+            tableScrollView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
-            tableScrollView.bottomAnchor.constraint(
+            tableScrollView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor)
-                equalTo: contentView.bottomAnchor),
-            tableScrollView.leadingAnchor.constraint(
-                equalTo: contentView.leadingAnchor),
-            tableScrollView.trailingAnchor.constraint(
-               equalTo: contentView.trailingAnchor)
         ])
     }
 
@@ -200,45 +170,34 @@ class SearchViewController: NSViewController, NSTextFieldDelegate,
         view.wantsLayer = true
         view.layer?.backgroundColor = NSColor.clear.cgColor
 
-        keyboardEvents = LocalEventMonitor(mask: [.keyDown], handler:
+        keyboardEvents = LocalEventMonitor(mask: [.keyDown]) { [weak self] event in
-        { [weak self] event in
             let key = event.keyCode
             let modifiers = event.modifierFlags.rawValue
 
-            // TODO: Implement helper functions for modifiers.
             if let controller = self {
-                if modsContains(keys: OSCtrl, in: modifiers) &&
+                if modsContains(keys: OSCtrl, in: modifiers) && key == kVK_ANSI_P ||
-                        key == kVK_ANSI_P ||
+                   modsContainsNone(in: modifiers) && key == kVK_UpArrow
-                    modsContainsNone(in: modifiers) &&
-                        key == kVK_UpArrow
                 {
                     controller.programsTableViewSelection -= 1
-                } else if modsContains(keys: OSCtrl, in: modifiers) &&
+                } else if modsContains(keys: OSCtrl, in: modifiers) && key == kVK_ANSI_N ||
-                        key == kVK_ANSI_N ||
+                          modsContainsNone(in: modifiers) && key == kVK_DownArrow
-                    modsContainsNone(in: modifiers) &&
-                        (key == kVK_DownArrow)
                 {
                     controller.programsTableViewSelection += 1
                 }
 
-                if controller.programsTableViewSelection >
+                if controller.programsTableViewSelection > controller.programsList.count-1 {
-                    controller.programsList.count-1
+                    controller.programsTableViewSelection = controller.programsList.count-1
-                {
-                    controller.programsTableViewSelection =
-                        controller.programsList.count-1
                 } else if controller.programsTableViewSelection < 0 {
                     controller.programsTableViewSelection = 0
                 }
 
                 let select = controller.programsTableViewSelection
-                    self?.programsTableView.selectRowIndexes(
+                    self?.programsTableView.selectRowIndexes(IndexSet(integer: select), byExtendingSelection: false)
-                        IndexSet(integer: select),
-                        byExtendingSelection: false)
                     self?.programsTableView.scrollRowToVisible(select)
             }
 
             return event
-        })
+        }
 
         settingsPopover.delegate = self
 
@@ -290,7 +249,7 @@ class SearchViewController: NSViewController, NSTextFieldDelegate,
 
     @objc
     func openSettings() {
-        // HACK: This is an interseting behavior. When NSPopover appears 
+        // HACK: This is an interesting behavior. When NSPopover appears
         //       the first time, it always displays in the wrong location;
         //       however, showing it twice does result in the right
         //       location.
@@ -307,19 +266,16 @@ class SearchViewController: NSViewController, NSTextFieldDelegate,
     }
 
     private func openProgram(_ program: Program) {
-        let url = URL(fileURLWithPath: program.path)
+        let url = URL(fileURLWithPath: program.path).appendingPathComponent(program.name+program.ext)
-            .appendingPathComponent(program.name+program.ext)
         let config = NSWorkspace.OpenConfiguration()
 
-        NSWorkspace.shared.openApplication(at: url,
+        // NOTE: This needs a window! Do not just copy-paste
-            configuration: config)
+        //       this block elsewhere.
-        { [weak self] application, error in
+        NSWorkspace.shared.openApplication(at: url, configuration: config) { [weak self] application, error in
             if let error = error {
                 print("\(error.localizedDescription)")
             } else {
                 print("Program opened successfully")
-                // NOTE: This needs a window! Do not just copy-paste
-                //       this block elsewhere.
                 DispatchQueue.main.async {
                     if let window = self?.view.window {
                         window.resignKey()
@@ -331,51 +287,46 @@ class SearchViewController: NSViewController, NSTextFieldDelegate,
 
     func controlTextDidChange(_ obj: Notification) {
         guard let searchInput = obj.object as? EditableNSTextField
-        else { return }
+            else { return }
-
-        let programs = PathManager.shared.programs
 
         programsList = []
-        for i in programs.indices {
+
-            var program = programs[i]
+        if !searchInput.stringValue.isEmpty {
-            if programsList.count >= 10 {
+            for path in PathManager.shared.paths {
-                break
+                if programsList.count >= 10 { break }
-            }
+
-            if program.name.lowercased().contains(
+                for i in path.value.indices {
-                searchInput.stringValue.lowercased())
+                    var prog = path.value[i]
-            {
+                    if programsList.count >= 10 { break }
-                let url = URL(fileURLWithPath: program.path)
+
-                    .appendingPathComponent(program.name+program.ext)
+                    if prog.name.lowercased().contains(searchInput.stringValue.lowercased())
-                let image = NSWorkspace.shared.icon(forFile: url.path)
+                    {
-                program.img = image
+                        let url = URL(fileURLWithPath: prog.path).appendingPathComponent(prog.name+prog.ext)
-                programsList.append(program)
+                        let image = NSWorkspace.shared.icon(forFile: url.path)
+                        prog.img = image
+                        programsList.append(prog)
+                    }
+                }
             }
         }
         reloadProgramsTableViewData()
 
         programsTableViewSelection = 0
-        programsTableView.selectRowIndexes(
+        programsTableView.selectRowIndexes(IndexSet(integer: programsTableViewSelection), byExtendingSelection: false)
-            IndexSet(integer: programsTableViewSelection),
-            byExtendingSelection: false)
         programsTableView.scrollRowToVisible(programsTableViewSelection)
     }
 
-    func control(_ control: NSControl, textView: NSTextView,
+    func control(_ control: NSControl, textView: NSTextView, doCommandBy commandSelector: Selector) -> Bool {
-        doCommandBy commandSelector: Selector) -> Bool
-    {
         if commandSelector == #selector(NSResponder.insertNewline(_:)) {
             if programsList.count > 0 {
                 let program = programsList[programsTableViewSelection]
                 openProgram(program)
-                NSApp.sendAction(#selector(NSResponder.selectAll(_:)),
+                NSApp.sendAction(#selector(NSResponder.selectAll(_:)), to: nil, from: self)
-                    to: nil, from: self)
             }
             return true
         } else if commandSelector == #selector(NSResponder.insertTab(_:)) {
             return true
-        } else if commandSelector == #selector(NSResponder.moveUp(_:)) ||
+        } else if commandSelector == #selector(NSResponder.moveUp(_:)) || commandSelector == #selector(NSResponder.moveDown(_:)) {
-            commandSelector == #selector(NSResponder.moveDown(_:))
-        {
             // Ignore arrows keys up or down because we use those to
             // navigate the programs list.
             return true

src/SettingsViewController.swift

@@ -2,10 +2,9 @@ import AppKit
 import Carbon
 import ServiceManagement
 
-class SettingsViewController: NSViewController, NSTextFieldDelegate,
+class SettingsViewController: NSViewController,
-                              KeyDetectorButtonDelegate,
+                              NSTextFieldDelegate, KeyDetectorButtonDelegate, NSTableViewDataSource,
-                              NSTableViewDataSource, NSTableViewDelegate,
+                              NSTableViewDelegate, PathsTableCellViewDelegate
-                              PathsTableCellViewDelegate
 {
     private var recording = false
 
@@ -14,6 +13,8 @@ class SettingsViewController: NSViewController, NSTextFieldDelegate,
     private var keyCode = Int(kVK_Space)
     private var modifiers = Int(optionKey)
 
+    private var paths: [String] = []
+
     // NOTE:  PERF: This is very slow to initialize because it creates a
     //             a new process. This also cannot be done on a separate
     //             thread. This sucks because the program now takes
@@ -29,13 +30,22 @@ class SettingsViewController: NSViewController, NSTextFieldDelegate,
 
     private var shortcutsLabel: NSTextField = {
         let textField = NSTextField(labelWithString: "Shortcut")
-        textField.font = NSFont.systemFont(
+        textField.font = NSFont.systemFont(ofSize: NSFontDescriptor.preferredFontDescriptor(forTextStyle: .title2).pointSize, weight: .bold)
-            ofSize: NSFontDescriptor.preferredFontDescriptor(
-                forTextStyle: .title2).pointSize, weight: .bold)
         textField.translatesAutoresizingMaskIntoConstraints = false
         return textField
     }()
 
+    private var aboutButton: NSButton = {
+        let button = NSButton()
+        button.image = systemImage("info.circle.fill", .title2, .large, .init(paletteColors: [.white, .systemGray]))
+        button.isBordered = false
+        button.action = #selector(showAbout)
+        button.sizeToFit()
+        button.toolTip = "About"
+        button.translatesAutoresizingMaskIntoConstraints = false
+        return button
+    }()
+
     private var ctrlButton: NSButton = {
         let button = NSButton()
         button.title = "⌃"
@@ -87,9 +97,7 @@ class SettingsViewController: NSViewController, NSTextFieldDelegate,
         textField.isBezeled = false
         textField.drawsBackground = false
         textField.alignment = .center
-        textField.font = NSFont.systemFont(
+        textField.font = NSFont.systemFont(ofSize: NSFontDescriptor.preferredFontDescriptor(forTextStyle: .body).pointSize, weight: .bold)
-            ofSize: NSFontDescriptor.preferredFontDescriptor(
-                forTextStyle: .body).pointSize, weight: .bold)
         textField.translatesAutoresizingMaskIntoConstraints = false
         return textField
     }()
@@ -104,11 +112,8 @@ class SettingsViewController: NSViewController, NSTextFieldDelegate,
     }()
 
     private var pathsLabel: NSTextField = {
-        let textField =
+        let textField = NSTextField(labelWithString: "Application Directories")
-            NSTextField(labelWithString: "Application Directories")
+        textField.font = NSFont.systemFont(ofSize: NSFontDescriptor.preferredFontDescriptor(forTextStyle: .title2).pointSize, weight: .bold)
-        textField.font = NSFont.systemFont(
-            ofSize: NSFontDescriptor.preferredFontDescriptor(
-                forTextStyle: .title2).pointSize, weight: .bold)
         textField.translatesAutoresizingMaskIntoConstraints = false
         return textField
     }()
@@ -132,8 +137,7 @@ class SettingsViewController: NSViewController, NSTextFieldDelegate,
         table.allowsColumnReordering = false
         table.allowsColumnResizing = false
         table.allowsColumnSelection = false
-        table.addTableColumn(NSTableColumn(
+        table.addTableColumn(NSTableColumn(identifier: NSUserInterfaceItemIdentifier("Paths")))
-            identifier: NSUserInterfaceItemIdentifier("Paths")))
 
         //rowHeight cgfloat must see doc
 
@@ -146,12 +150,8 @@ class SettingsViewController: NSViewController, NSTextFieldDelegate,
         control.segmentCount = 2
         control.segmentStyle = .roundRect
 
-        control.setImage(
+        control.setImage(NSImage(systemSymbolName: "plus", accessibilityDescription: nil), forSegment: 0)
-            NSImage(systemSymbolName: "plus",
+        control.setImage(NSImage(systemSymbolName: "minus", accessibilityDescription: nil), forSegment: 1)
-            accessibilityDescription: nil), forSegment: 0)
-        control.setImage(
-            NSImage(systemSymbolName: "minus",
-            accessibilityDescription: nil), forSegment: 1)
 
         control.setToolTip("Add Path", forSegment: 0)
         control.setToolTip("Remove Path", forSegment: 1)
@@ -187,6 +187,7 @@ class SettingsViewController: NSViewController, NSTextFieldDelegate,
 
     private func addSubviews() {
         view.addSubview(shortcutsLabel)
+        view.addSubview(aboutButton)
         view.addSubview(ctrlButton)
         view.addSubview(cmdButton)
         view.addSubview(optButton)
@@ -204,87 +205,49 @@ class SettingsViewController: NSViewController, NSTextFieldDelegate,
 
     private func setConstraints() {
         NSLayoutConstraint.activate([
-            shortcutsLabel.topAnchor.constraint(
+            shortcutsLabel.topAnchor.constraint(equalTo: view.topAnchor, constant: ViewConstants.spacing10),
-                equalTo: view.topAnchor,
+            shortcutsLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: ViewConstants.spacing10),
-                constant: ViewConstants.spacing10),
-            shortcutsLabel.leadingAnchor.constraint(
-                equalTo: view.leadingAnchor,
-                constant: ViewConstants.spacing10),
 
-            ctrlButton.topAnchor.constraint(
+            aboutButton.firstBaselineAnchor.constraint(equalTo: shortcutsLabel.firstBaselineAnchor),
-                equalTo: shortcutsLabel.bottomAnchor,
+            aboutButton.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -ViewConstants.spacing10),
-                constant: ViewConstants.spacing10),
-            ctrlButton.leadingAnchor.constraint(
-                equalTo: shortcutsLabel.leadingAnchor),
 
-            cmdButton.centerYAnchor.constraint(
+            ctrlButton.topAnchor.constraint(equalTo: shortcutsLabel.bottomAnchor, constant: ViewConstants.spacing10),
-                equalTo: ctrlButton.centerYAnchor),
+            ctrlButton.leadingAnchor.constraint(equalTo: shortcutsLabel.leadingAnchor),
-            cmdButton.leadingAnchor.constraint(
-                equalTo: ctrlButton.trailingAnchor,
-                constant: ViewConstants.spacing5),
 
-            optButton.centerYAnchor.constraint(
+            cmdButton.centerYAnchor.constraint(equalTo: ctrlButton.centerYAnchor),
-                equalTo: ctrlButton.centerYAnchor),
+            cmdButton.leadingAnchor.constraint(equalTo: ctrlButton.trailingAnchor, constant: ViewConstants.spacing5),
-            optButton.leadingAnchor.constraint(
-                equalTo: cmdButton.trailingAnchor,
-                constant: ViewConstants.spacing5),
 
-            shiftButton.centerYAnchor.constraint(
+            optButton.centerYAnchor.constraint(equalTo: ctrlButton.centerYAnchor),
-                equalTo: ctrlButton.centerYAnchor),
+            optButton.leadingAnchor.constraint(equalTo: cmdButton.trailingAnchor, constant: ViewConstants.spacing5),
-            shiftButton.leadingAnchor.constraint(
-                equalTo: optButton.trailingAnchor,
-                constant: ViewConstants.spacing5),
 
-            plusLabel.centerYAnchor.constraint(
+            shiftButton.centerYAnchor.constraint(equalTo: ctrlButton.centerYAnchor),
-                equalTo: ctrlButton.centerYAnchor),
+            shiftButton.leadingAnchor.constraint(equalTo: optButton.trailingAnchor, constant: ViewConstants.spacing5),
-            plusLabel.leadingAnchor.constraint(
+
-                equalTo: shiftButton.trailingAnchor,
+            plusLabel.centerYAnchor.constraint(equalTo: ctrlButton.centerYAnchor),
-                constant: ViewConstants.spacing5),
+            plusLabel.leadingAnchor.constraint(equalTo: shiftButton.trailingAnchor, constant: ViewConstants.spacing5),
 
             recordButton.widthAnchor.constraint(equalToConstant: 40),
-            recordButton.centerYAnchor.constraint(
+            recordButton.centerYAnchor.constraint(equalTo: ctrlButton.centerYAnchor),
-                equalTo: ctrlButton.centerYAnchor),
+            recordButton.leadingAnchor.constraint(equalTo: plusLabel.trailingAnchor, constant: ViewConstants.spacing5),
-            recordButton.leadingAnchor.constraint(
-                equalTo: plusLabel.trailingAnchor,
-                constant: ViewConstants.spacing5),
 
-            pathsLabel.topAnchor.constraint(
+            pathsLabel.topAnchor.constraint(equalTo: ctrlButton.bottomAnchor, constant: ViewConstants.spacing20),
-                equalTo: ctrlButton.bottomAnchor,
+            pathsLabel.leadingAnchor.constraint(equalTo: shortcutsLabel.leadingAnchor),
-                constant: ViewConstants.spacing20),
-            pathsLabel.leadingAnchor.constraint(
-                equalTo: shortcutsLabel.leadingAnchor),
 
             tableScrollView.widthAnchor.constraint(equalToConstant: 350),
             tableScrollView.heightAnchor.constraint(equalToConstant: 150),
-            tableScrollView.topAnchor.constraint(
+            tableScrollView.topAnchor.constraint(equalTo: pathsLabel.bottomAnchor),
-                equalTo: pathsLabel.bottomAnchor),
+            tableScrollView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
-            tableScrollView.leadingAnchor.constraint(
+            tableScrollView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
-                equalTo: view.leadingAnchor),
-            tableScrollView.trailingAnchor.constraint(
-                equalTo: view.trailingAnchor),
 
-            pathsControl.topAnchor.constraint(
+            pathsControl.topAnchor.constraint(equalTo: tableScrollView.bottomAnchor, constant: ViewConstants.spacing10),
-                equalTo: tableScrollView.bottomAnchor,
+            pathsControl.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: ViewConstants.spacing10),
-                constant: ViewConstants.spacing10),
-            pathsControl.leadingAnchor.constraint(
-                equalTo: view.leadingAnchor,
-                constant: ViewConstants.spacing10),
 
-            launchAtLoginButton.topAnchor.constraint(
+            launchAtLoginButton.topAnchor.constraint(equalTo: pathsControl.bottomAnchor, constant: ViewConstants.spacing10),
-                equalTo: pathsControl.bottomAnchor,
+            launchAtLoginButton.trailingAnchor.constraint(equalTo: resetAllButton.leadingAnchor, constant: -ViewConstants.spacing10),
-                constant: ViewConstants.spacing10),
-            launchAtLoginButton.trailingAnchor.constraint(
-                equalTo: resetAllButton.leadingAnchor,
-                constant: -ViewConstants.spacing10),
 
-            resetAllButton.centerYAnchor.constraint(
+            resetAllButton.centerYAnchor.constraint(equalTo: launchAtLoginButton.centerYAnchor),
-                equalTo: launchAtLoginButton.centerYAnchor),
+            resetAllButton.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -ViewConstants.spacing10),
-            resetAllButton.trailingAnchor.constraint(
+            resetAllButton.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -ViewConstants.spacing10),
-                equalTo: view.trailingAnchor,
-                constant: -ViewConstants.spacing10),
-            resetAllButton.bottomAnchor.constraint(
-                equalTo: view.bottomAnchor,
-                constant: -ViewConstants.spacing10),
         ])
     }
 
@@ -320,26 +283,20 @@ class SettingsViewController: NSViewController, NSTextFieldDelegate,
 
         // PERF: Maybe we shouldn't fetch it on every appearance?
         //       Only do it in AppDelegate?
-        if let code =
+        if let code = UserDefaults.standard.object(forKey: "keyCode") as? Int {
-            UserDefaults.standard.object(forKey: "keyCode") as? Int
-        {
             keyCode = code
         }
-        if let mods =
+        if let mods = UserDefaults.standard.object(forKey: "keyModifiers") as? Int {
-            UserDefaults.standard.object(forKey: "keyModifiers") as? Int
-        {
             modifiers = mods
         }
 
-        pathsTableView.reloadData()
+        loadPaths()
         syncModifierButtons()
         launchAtLoginStatus()
     }
 
     override func viewDidAppear() {
         super.viewDidAppear()
-
-        self.view.window?.center()
     }
 
     override func viewWillDisappear() {
@@ -351,19 +308,34 @@ class SettingsViewController: NSViewController, NSTextFieldDelegate,
         UserDefaults.standard.set(keyCode, forKey: "keyCode")
         UserDefaults.standard.set(modifiers, forKey: "keyModifiers")
 
-        PathManager.shared.removeEmpty()
+        // Merge PathManagers paths and user paths.
+        // WARNING: This seems a bit error prone.
+        for path in paths {
+            if !PathManager.shared.contains(path) {
+                PathManager.shared.addPath(path)
+            }
+        }
+        for path in PathManager.shared.paths {
+            if !paths.contains(path.key) {
+                PathManager.shared.removePath(path.key)
+            }
+        }
+        PathManager.shared.updateIndex()
         PathManager.shared.savePaths()
-        PathManager.shared.rebuildIndex()
     }
 
     override func loadView() {
         self.view = NSView()
     }
 
+    @objc
+    private func showAbout() {
+        delegate.showAboutWindow()
+    }
+
     @objc
     private func handleModifiers() {
-        // NOTE: Revert to default modifier if none of the modifier
+        // Revert to default modifier if none of the modifier buttons are on.
-        //       buttons are on.
         if cmdButton.state != .on, optButton.state != .on,
            ctrlButton.state != .on, shiftButton.state != .on
         {
@@ -391,14 +363,23 @@ class SettingsViewController: NSViewController, NSTextFieldDelegate,
 
     @objc
     private func reset() {
-        keyCode = Int(kVK_Space)
+        keyCode   = Int(kVK_Space)
         modifiers = Int(optionKey)
         HotKeyManager.shared.registerHotKey(key: keyCode, modifiers: modifiers)
         UserDefaults.standard.set(keyCode, forKey: "keyCode")
         UserDefaults.standard.set(modifiers, forKey: "keyModifiers")
         syncModifierButtons()
 
-        PathManager.shared.reset()
+        PathManager.shared.resetPaths()
+        loadPaths()
+    }
+
+    private func loadPaths() {
+        paths = []
+        for path in PathManager.shared.paths {
+            paths.append(path.key)
+        }
+        paths.sort()
         pathsTableView.reloadData()
     }
 
@@ -454,25 +435,17 @@ class SettingsViewController: NSViewController, NSTextFieldDelegate,
         let selectedSegment = sender.selectedSegment
         switch selectedSegment {
         case 0:
-            // NOTE: Seems a bit error prone.
+            let row = paths.count
-            var row = PathManager.shared.userPaths.count-1
+            paths.append("")
-            if !PathManager.shared.userPaths[row].isEmpty {
+            pathsTableView.insertRows(at: IndexSet(integer: row), withAnimation: [])
-                row += 1
+
-                PathManager.shared.addPath("")
-                pathsTableView.insertRows(at: IndexSet(integer: row),
-                    withAnimation: [])
-            }
             pathsTableView.scrollRowToVisible(row)
-            pathsTableView.selectRowIndexes(IndexSet(integer: row),
+            pathsTableView.selectRowIndexes(IndexSet(integer: row), byExtendingSelection: false)
-                byExtendingSelection: false)
+            (pathsTableView.view(atColumn: 0, row: row, makeIfNecessary: false) as? PathsTableCellView)?.startEditing()
-            (pathsTableView.view(atColumn: 0, row: row,
-                makeIfNecessary: false) as? PathsTableCellView)?
-                    .startEditing()
             break
         case 1:
             if pathsTableView.selectedRow > -1 {
-                PathManager.shared.userPaths
+                paths.remove(at: pathsTableView.selectedRow)
-                    .remove(at: pathsTableView.selectedRow)
                 pathsTableView.reloadData()
             }
             break
@@ -484,23 +457,18 @@ class SettingsViewController: NSViewController, NSTextFieldDelegate,
     @objc
     private func editItem(_ sender: NSTableView) {
         pathsTableView.deselectAll(nil)
-        pathsTableView.selectRowIndexes(
+        pathsTableView.selectRowIndexes(IndexSet(integer: pathsTableView.clickedRow), byExtendingSelection: false)
-            IndexSet(integer: pathsTableView.clickedRow),
-            byExtendingSelection: false)
 
-        if let cell = pathsTableView.view(atColumn: 0,
+        if let cell = pathsTableView.view(atColumn: 0, row: pathsTableView.clickedRow, makeIfNecessary: false) as? PathsTableCellView {
-            row: pathsTableView.clickedRow,
-            makeIfNecessary: false) as? PathsTableCellView
-        {
             cell.startEditing()
         }
     }
 
     func titleFieldFinishedEditing(tag: Int, text: String) {
         if text.isEmpty {
-            PathManager.shared.userPaths.remove(at: tag)
+            paths.remove(at: tag)
         } else {
-            PathManager.shared.userPaths[tag] = text
+            paths[tag] = text
         }
         pathsTableView.reloadData()
     }
@@ -515,34 +483,32 @@ class SettingsViewController: NSViewController, NSTextFieldDelegate,
     func selectionButtonClicked(tag: Int) {
         NSRunningApplication.current.activate(options: .activateAllWindows)
         delegate.window.level = .normal
+        delegate.aboutWindow.performClose(nil)
 
         if dirPicker.runModal() == .OK {
             if let url = dirPicker.url {
-                PathManager.shared.userPaths[tag] = url.path
+                paths[tag] = url.path
                 pathsTableView.reloadData()
             }
         }
 
         delegate.window.level = .statusBar
         delegate.window.makeKeyAndOrderFront(nil)
-        if let controller =
+        if let controller = delegate.window.contentViewController as?  SearchViewController {
-            delegate.window.contentViewController as?  SearchViewController
-        {
             controller.openSettings()
         }
     }
 
     func numberOfRows(in tableView: NSTableView) -> Int {
-        return PathManager.shared.userPaths.count
+        return paths.count
     }
 
     func tableView(_ tableView: NSTableView,
         viewFor tableColumn: NSTableColumn?, row: Int) -> NSView?
     {
-        let rect = NSRect(x: 0, y: 0,
+        let rect = NSRect(x: 0, y: 0, width: tableColumn!.width, height: 20)
-            width: tableColumn!.width, height: 20)
         let cell = PathsTableCellView(frame: rect)
-        cell.titleField.stringValue = PathManager.shared.userPaths[row]
+        cell.titleField.stringValue = paths[row]
         cell.delegate = self
         cell.id = row
         return cell