Decouple core Yaak logic from Tauri (#354)

crates-tauri/yaak-mac-window/src/lib.rs

@@ -0,0 +1,43 @@
+mod commands;
+
+#[cfg(target_os = "macos")]
+mod mac;
+
+use crate::commands::{set_theme, set_title};
+use std::sync::atomic::AtomicBool;
+use tauri::{Manager, Runtime, generate_handler, plugin, plugin::TauriPlugin};
+
+pub trait AppHandleMacWindowExt {
+    /// Sets whether to use the native titlebar
+    fn set_native_titlebar(&self, enable: bool);
+}
+
+impl<R: Runtime> AppHandleMacWindowExt for tauri::AppHandle<R> {
+    fn set_native_titlebar(&self, enable: bool) {
+        self.state::<PluginState>()
+            .native_titlebar
+            .store(enable, std::sync::atomic::Ordering::Relaxed);
+    }
+}
+
+pub(crate) struct PluginState {
+    native_titlebar: AtomicBool,
+}
+
+pub fn init<R: Runtime>() -> TauriPlugin<R> {
+    let mut builder = plugin::Builder::new("yaak-mac-window")
+        .setup(move |app, _| {
+            app.manage(PluginState { native_titlebar: AtomicBool::new(false) });
+            Ok(())
+        })
+        .invoke_handler(generate_handler![set_title, set_theme]);
+
+    #[cfg(target_os = "macos")]
+    {
+        builder = builder.on_window_ready(move |window| {
+            mac::setup_traffic_light_positioner(&window);
+        });
+    }
+
+    builder.build()
+}