Initial commit.

src/EditableNSTextField.swift

@@ -0,0 +1,33 @@
+import Cocoa
+import os
+
+final class EditableNSTextField: NSTextField {
+    private let commandKey = NSEvent.ModifierFlags.command.rawValue
+    private let commandShiftKey = NSEvent.ModifierFlags.command.rawValue | NSEvent.ModifierFlags.shift.rawValue
+
+    override func performKeyEquivalent(with event: NSEvent) -> Bool {
+        if event.type == NSEvent.EventType.keyDown {
+            if (event.modifierFlags.rawValue & NSEvent.ModifierFlags.deviceIndependentFlagsMask.rawValue) == commandKey {
+                switch event.charactersIgnoringModifiers! {
+                case "x":
+                    if NSApp.sendAction(#selector(NSText.cut(_:)), to: nil, from: self) { return true }
+                case "c":
+                    if NSApp.sendAction(#selector(NSText.copy(_:)), to: nil, from: self) { return true }
+                case "v":
+                    if NSApp.sendAction(#selector(NSText.paste(_:)), to: nil, from: self) { return true }
+                case "z":
+                    if NSApp.sendAction(Selector(("undo:")), to: nil, from: self) { return true }
+                case "a":
+                    if NSApp.sendAction(#selector(NSResponder.selectAll(_:)), to: nil, from: self) { return true }
+                default:
+                    break
+                }
+            } else if (event.modifierFlags.rawValue & NSEvent.ModifierFlags.deviceIndependentFlagsMask.rawValue) == commandShiftKey {
+                if event.charactersIgnoringModifiers == "Z" {
+                    if NSApp.sendAction(Selector(("redo:")), to: nil, from: self) { return true }
+                }
+            }
+        }
+        return super.performKeyEquivalent(with: event)
+    }
+}