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import Foundation
// Darwin notifications via CoreFoundation — the macOS-native, signal-like way
// to trigger a refresh from the shell with no client binary:
//
// notifyutil -p <prefix><name>
//
// e.g. notifyutil -p house.panini.phbar.touch.workspaces
//
// (notify.h isn't part of Swift's Darwin module, so we go through
// CFNotificationCenter, which talks to the same subsystem.)
//
// The callback fires on an arbitrary thread; handlers must hop to the main
// actor themselves (see AppDelegate.handleRefresh).
/// Retains the handler for the lifetime of the registration.
private final class NotifyBox {
let handler: @Sendable () -> Void
init(_ handler: @escaping @Sendable () -> Void) { self.handler = handler }
}
enum Notifier {
static let prefix = "house.panini.phbar.touch."
/// Register `handler` to fire whenever the notification is posted.
@discardableResult
static func register(_ name: String, handler: @escaping @Sendable () -> Void)
-> UnsafeMutableRawPointer
{
let fullName = prefix + name
let ctx = Unmanaged.passRetained(NotifyBox(handler)).toOpaque()
CFNotificationCenterAddObserver(
CFNotificationCenterGetDarwinNotifyCenter(),
ctx,
{ _, observer, _, _, _ in
guard let observer else { return }
let box = Unmanaged<NotifyBox>.fromOpaque(observer).takeUnretainedValue()
box.handler()
},
fullName as CFString,
nil,
.deliverImmediately
)
return ctx
}
/// Remove and release a registration. (Optional: process exit clears all.)
static func cancel(_ token: UnsafeMutableRawPointer) {
let center = CFNotificationCenterGetDarwinNotifyCenter()
CFNotificationCenterRemoveEveryObserver(center, token)
Unmanaged<NotifyBox>.fromOpaque(token).release()
}
}
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