byre/mac/Sources/Byre/ByreApp.swift

import AppKit
import SwiftTerm
import SwiftUI

typealias ViewState = State

@main
struct ByreApp: App {
    @ViewState private var connection = Connection()
    @ViewState private var spike = SpikeLog()

    var body: some Scene {
        Window("byre", id: "main") {
            RootView()
                .environment(connection)
                .environment(spike)
                .font(Fonts.font(13))
                .onAppear {
                    installCtrlMonitor(spike)
                }
        }
        .commands {
            CommandGroup(after: .appInfo) {
                Button("Change Server…") {
                    connection.changeServer()
                }
            }
            PasteboardCommands()
        }
    }
}

@MainActor
private func installCtrlMonitor(_ spike: SpikeLog) {
    NSEvent.addLocalMonitorForEvents(matching: .keyDown) { event in
        let flags = event.modifierFlags.intersection(.deviceIndependentFlagsMask)
        guard flags.contains(.control), !flags.contains(.command), let key = event.charactersIgnoringModifiers, ["k", "p", "l", "s", "/"].contains(key) else {
            return event
        }
        if event.window?.firstResponder is TerminalView {
            spike.log("ctrl-\(key) passed to the terminal")
            return event
        }
        spike.log("ctrl-\(key) taken as a Go shortcut")
        return nil
    }
}