add screen hot-plug patch

1 files changed, 73 insertions, 0 deletions

diff --git a/patches/bar-screen_hotplug-20260810-f6805c9.patch b/patches/bar-screen_hotplug-20260810-f6805c9.patch
new file mode 100644
index 0000000..1533b15
--- /dev/null
+++ b/patches/bar-screen_hotplug-20260810-f6805c9.patch
@@ -0,0 +1,73 @@
+diff --git a/Sources/bar/Models/AppDelegate.swift b/Sources/bar/Models/AppDelegate.swift
+index cefdfc0..5db4946 100644
+--- a/Sources/bar/Models/AppDelegate.swift
++++ b/Sources/bar/Models/AppDelegate.swift
+@@ -6,15 +6,10 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
+ 	private var windows: [BarWindow] = []
+ 	private var blocks: [Block] = Config.blocks.map(\.resolved)
+ 	private var tokens: [UnsafeMutableRawPointer] = []
++	private var screenObserver: NSObjectProtocol?
+ 
+ 	func applicationDidFinishLaunching(_ notification: Notification) {
+-		for screen in NSScreen.screens {
+-			let frame = Screen.barFrame(screen, position: Config.position, height: Config.height)
+-			let window = BarWindow(contentRect: frame)
+-			window.contentView = NSHostingView(rootView: BarView(blocks: blocks))
+-			window.orderFrontRegardless()
+-			windows.append(window)
+-		}
++		buildWindows()
+ 
+ 		// Register a listener to hide the bar
+ 		tokens.append(
+@@ -41,11 +36,24 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
+ 
+ 		// Start the block's auto refresh
+ 		for block in blocks { block.start() }
++
++		// Observe screen changes — recreate windows when displays
++		// are added or removed.
++		screenObserver = NotificationCenter.default.addObserver(
++			forName: NSApplication.didChangeScreenParametersNotification,
++			object: nil,
++			queue: .main
++		) { [weak self] _ in
++			self?.rebuildWindows()
++		}
+ 	}
+ 
+ 	func applicationWillTerminate(_ notification: Notification) {
+ 		for block in blocks { block.stop() }
+ 		for token in tokens { Notifier.cancel(token) }
++		if let observer = screenObserver {
++			NotificationCenter.default.removeObserver(observer)
++		}
+ 	}
+ 
+ 	/// Order out all bar windows
+@@ -68,6 +76,25 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
+ 		}
+ 	}
+ 
++	/// Create a bar window for each connected screen.
++	@MainActor private func buildWindows() {
++		for screen in NSScreen.screens {
++			let frame = Screen.barFrame(screen, position: Config.position, height: Config.height)
++			let window = BarWindow(contentRect: frame)
++			window.contentView = NSHostingView(rootView: BarView(blocks: blocks))
++			window.orderFrontRegardless()
++			windows.append(window)
++		}
++	}
++
++	/// Remove all existing windows and create new ones for the current
++	/// set of screens — called when a display is connected or disconnected.
++	@MainActor private func rebuildWindows() {
++		for window in windows { window.orderOut(nil) }
++		windows.removeAll()
++		buildWindows()
++	}
++
+ 	/// Called from a Darwin notification handler. Marked `nonisolated` because
+ 	/// libnotify's delivery contract isn't statically visible to Swift, so we
+ 	/// hop back to the main actor explicitly.