feat: Add MacOS support.

crates/pikl-gui/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "pikl-gui"
-description = "GUI frontend for pikl-menu (iced + Wayland layer-shell)."
+description = "GUI frontend for pikl-menu (iced-based, with platform-specific windowing)."
 version.workspace = true
 edition.workspace = true
 license.workspace = true
@@ -11,6 +11,8 @@ workspace = true
 [dependencies]
 pikl-core = { path = "../pikl-core" }
 iced = { version = "0.14", features = ["tokio"] }
-iced_layershell = "0.15"
 tokio = { version = "1", features = ["sync", "macros", "rt"] }
 tracing = "0.1"
+
+[target.'cfg(target_os = "linux")'.dependencies]
+iced_layershell = "0.15"

crates/pikl-gui/src/lib.rs

@@ -1,7 +1,5 @@
-//! GUI frontend for pikl-menu. Renders a Wayland
-//! layer-shell overlay using iced. Same channel pattern as
-//! the TUI: receives [`ViewState`] snapshots, sends
-//! [`Action`]s into the core engine.
+//! GUI frontend for pikl-menu. Platform-aware: uses Wayland
+//! layer-shell on Linux, native window overlay on macOS.
 
 use std::sync::{Mutex, OnceLock};
 
@@ -9,12 +7,11 @@ use iced::keyboard::key::Named;
 use iced::keyboard::{Key, Modifiers};
 use iced::widget::{column, container, row, scrollable, text, text_input, Column};
 use iced::{Color, Element, Font, Length, Subscription, Task, Theme};
-use iced_layershell::build_pattern::application as layer_application;
-use iced_layershell::reexport::{Anchor, KeyboardInteractivity, Layer};
-use iced_layershell::settings::{LayerShellSettings, Settings};
-use iced_layershell::to_layer_message;
 use tokio::sync::{broadcast, mpsc};
 
+#[cfg(target_os = "linux")]
+use iced_layershell::to_layer_message;
+
 use pikl_core::event::{
     Action, MenuEvent, ModifiedAction, Modifiers as PiklModifiers, Mode, ViewState, VisibleItem,
 };
@@ -22,6 +19,19 @@ use pikl_core::event::{
 /// Number of visible items in the list viewport.
 const VIEWPORT_HEIGHT: u16 = 20;
 
+/// GUI error type. Wraps platform-specific errors from the
+/// iced backends into a single Display-able type.
+#[derive(Debug)]
+pub struct GuiError(String);
+
+impl std::fmt::Display for GuiError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_str(&self.0)
+    }
+}
+
+impl std::error::Error for GuiError {}
+
 /// Pending key state for multi-key sequences (e.g. `gg`).
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 enum PendingKey {
@@ -29,10 +39,10 @@ enum PendingKey {
     G,
 }
 
-/// Messages for the iced application. The `#[to_layer_message]`
-/// macro generates the `TryInto<LayershellCustomActionWithId>`
-/// impl that iced_layershell requires.
-#[to_layer_message]
+/// Messages for the iced application. On Linux the
+/// `#[to_layer_message]` macro adds layer-shell variants
+/// that the wildcard arm in `update` handles.
+#[cfg_attr(target_os = "linux", to_layer_message)]
 #[derive(Debug, Clone)]
 enum Message {
     /// A state snapshot arrived from the core engine.
@@ -80,73 +90,104 @@ struct Pikl {
     filter_input_id: iced::widget::Id,
 }
 
-/// Start the GUI. Creates a Wayland layer-shell overlay,
-/// runs the iced event loop, and exits when the user
-/// confirms or cancels.
+/// Boot closure shared between platforms. Creates the initial
+/// Pikl state and returns a focus task for the filter input.
+fn boot() -> (Pikl, Task<Message>) {
+    let input_id = iced::widget::Id::unique();
+    let atx = ACTION_TX
+        .get()
+        .and_then(|m| m.lock().unwrap_or_else(|e| e.into_inner()).take())
+        .unwrap_or_else(|| {
+            let (tx, _) = mpsc::channel::<ModifiedAction>(1);
+            tx
+        });
+    let pikl = Pikl {
+        action_tx: atx,
+        view_state: None,
+        filter_text: String::new(),
+        mode: Mode::Insert,
+        pending: PendingKey::None,
+        multi_enabled: false,
+        visual_anchor: None,
+        last_generation: 0,
+        initial_focus_done: false,
+        filter_input_id: input_id.clone(),
+    };
+    (pikl, iced::widget::operation::focus(input_id))
+}
+
+// ── Platform: Wayland layer-shell (Linux) ──────────────
+
+#[cfg(target_os = "linux")]
 pub fn run(
     action_tx: mpsc::Sender<ModifiedAction>,
     event_rx: broadcast::Receiver<MenuEvent>,
-) -> Result<(), iced_layershell::Error> {
-    // Send initial resize to core so it knows our viewport.
+) -> Result<(), GuiError> {
+    use iced_layershell::build_pattern::application as layer_application;
+    use iced_layershell::reexport::{Anchor, KeyboardInteractivity, Layer};
+    use iced_layershell::settings::{LayerShellSettings, Settings};
+
+    setup_bridge(action_tx, event_rx);
+
+    layer_application(boot, "pikl", update, view)
+        .settings(Settings {
+            layer_settings: LayerShellSettings {
+                layer: Layer::Overlay,
+                anchor: Anchor::Top | Anchor::Left | Anchor::Right,
+                size: Some((0, 600)),
+                keyboard_interactivity: KeyboardInteractivity::Exclusive,
+                exclusive_zone: -1,
+                margin: (200, 400, 0, 400),
+                ..Default::default()
+            },
+            ..Default::default()
+        })
+        .subscription(subscription)
+        .theme(theme)
+        .run()
+        .map_err(|e| GuiError(format!("{e}")))
+}
+
+// ── Platform: native window overlay (macOS) ────────────
+
+#[cfg(target_os = "macos")]
+pub fn run(
+    action_tx: mpsc::Sender<ModifiedAction>,
+    event_rx: broadcast::Receiver<MenuEvent>,
+) -> Result<(), GuiError> {
+    setup_bridge(action_tx, event_rx);
+
+    iced::application(boot, update, view)
+        .title("pikl")
+        .window_size((800, 600))
+        .centered()
+        .decorations(false)
+        .level(iced::window::Level::AlwaysOnTop)
+        .subscription(subscription)
+        .theme(theme)
+        .run()
+        .map_err(|e| GuiError(format!("{e}")))
+}
+
+// ── Shared setup ───────────────────────────────────────
+
+/// Send initial resize to core, spawn the bridge thread,
+/// and stash channels in global slots.
+fn setup_bridge(
+    action_tx: mpsc::Sender<ModifiedAction>,
+    event_rx: broadcast::Receiver<MenuEvent>,
+) {
     let _ = action_tx.blocking_send(ModifiedAction::new(Action::Resize {
         height: VIEWPORT_HEIGHT,
     }));
 
-    // Bridge: spawn a thread that reads core events and
-    // forwards them as Messages through an mpsc channel.
     let (bridge_tx, bridge_rx) = mpsc::channel::<Message>(64);
     std::thread::spawn(move || {
         bridge_core_events(event_rx, bridge_tx);
     });
 
-    // Stash channels in global slots so the boot fn pointer
-    // and subscription fn pointer can access them.
     let _ = BRIDGE_RX.set(Mutex::new(Some(bridge_rx)));
     let _ = ACTION_TX.set(Mutex::new(Some(action_tx)));
-
-    layer_application(
-        || {
-            let input_id = iced::widget::Id::unique();
-            let atx = ACTION_TX
-                .get()
-                .and_then(|m| m.lock().unwrap_or_else(|e| e.into_inner()).take())
-                .unwrap_or_else(|| {
-                    let (tx, _) = mpsc::channel::<ModifiedAction>(1);
-                    tx
-                });
-            let pikl = Pikl {
-                action_tx: atx,
-                view_state: None,
-                filter_text: String::new(),
-                mode: Mode::Insert,
-                pending: PendingKey::None,
-                multi_enabled: false,
-                visual_anchor: None,
-                last_generation: 0,
-                initial_focus_done: false,
-                filter_input_id: input_id.clone(),
-            };
-            (pikl, iced::widget::operation::focus(input_id))
-        },
-        "pikl",
-        update,
-        view,
-    )
-    .settings(Settings {
-        layer_settings: LayerShellSettings {
-            layer: Layer::Overlay,
-            anchor: Anchor::Top | Anchor::Left | Anchor::Right,
-            size: Some((0, 600)),
-            keyboard_interactivity: KeyboardInteractivity::Exclusive,
-            exclusive_zone: -1,
-            margin: (200, 400, 0, 400),
-            ..Default::default()
-        },
-        ..Default::default()
-    })
-    .subscription(subscription)
-    .theme(theme)
-    .run()
 }
 
 /// Read core events from the broadcast channel and forward
@@ -192,7 +233,10 @@ fn bridge_core_events(
     });
 }
 
+// ── Update / View / Subscription ───────────────────────
+
 fn update(state: &mut Pikl, message: Message) -> Task<Message> {
+    #[allow(unreachable_patterns)]
     match message {
         Message::StateChanged(vs) => {
             if vs.generation == state.last_generation {
@@ -212,8 +256,8 @@ fn update(state: &mut Pikl, message: Message) -> Task<Message> {
 
             // Re-focus the input on the first state update.
             // The boot focus task can fire before the widget
-            // tree exists, so this catches the Hyprland case
-            // where the input starts unfocused.
+            // tree exists, so this catches the case where the
+            // input starts unfocused.
             if !state.initial_focus_done {
                 state.initial_focus_done = true;
                 iced::widget::operation::focus(state.filter_input_id.clone())
@@ -400,14 +444,10 @@ fn subscription(_state: &Pikl) -> Subscription<Message> {
 /// bridge receiver from the global slot and yields Messages
 /// until the channel closes.
 fn core_event_stream() -> impl iced::futures::Stream<Item = Message> {
-    // Take the receiver from the global slot. Only the first
-    // subscription instantiation will get Some.
     let rx = BRIDGE_RX
         .get()
         .and_then(|m| m.lock().unwrap_or_else(|e| e.into_inner()).take());
 
-    // unfold with the receiver as state. Each step awaits one
-    // message and yields it.
     iced::futures::stream::unfold(rx, |state| async move {
         let mut rx = state?;
         match rx.recv().await {
@@ -417,6 +457,8 @@ fn core_event_stream() -> impl iced::futures::Stream<Item = Message> {
     })
 }
 
+// ── Keyboard handling ──────────────────────────────────
+
 /// Convert iced keyboard modifiers to pikl Modifiers.
 fn iced_modifiers(m: &iced::keyboard::Modifiers) -> PiklModifiers {
     PiklModifiers {